阅读说明：本技术 基于多卷芯并联的电池及其装配方法 (Battery based on parallel connection of multiple winding cores and assembly method thereof ) 是由 高冲 程辉 吴德 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种基于多卷芯并联的电池及其装配方法,其涉及电池技术领域,电池包括：第一对卷芯单元,包括第一单体卷芯、第二单体卷芯、两个第一连接片；第二对卷芯单元；盖板机构,包括止动架构件,止动架构件上具有第一定位凹槽、第二定位凹槽、第三定位凹槽、第四定位凹槽、第一贯穿口、第二贯穿口；第一对卷芯单元与第二对卷芯单元沿第一单体卷芯的厚度方向堆叠后,在第一单体卷芯和第二单体卷芯的中间处向背向盖板机构一侧进行弯折以使第一单体卷芯、第二单体卷芯、第三单体卷芯和第四单体卷芯沿其厚度方向堆叠。本申请至少解决极耳弯折时不易定型控制、连接片定位困难、极耳层数过多易出现虚焊现象中的一个问题。(The invention discloses a battery based on multi-winding core parallel connection and an assembly method thereof, which relate to the technical field of batteries, wherein the battery comprises: the first pair of winding core units comprise a first single winding core, a second single winding core and two first connecting pieces; a second pair of core units; the cover plate mechanism comprises a stop frame member, wherein the stop frame member is provided with a first positioning groove, a second positioning groove, a third positioning groove, a fourth positioning groove, a first through opening and a second through opening; after the first pair of roll core units and the second pair of roll core units are stacked along the thickness direction of the first monomer roll core, the first monomer roll core and the second monomer roll core are bent towards one side of the cover plate mechanism in a back direction so that the first monomer roll core, the second monomer roll core, the third monomer roll core and the fourth monomer roll core are stacked along the thickness direction. This application is difficult for when solving utmost point ear and buckling control, connection piece location difficulty, utmost point ear number of piles problem in the rosin joint phenomenon easily appears excessively.)

1. A multi-winding parallel battery, comprising:

the first pair of roll core units comprise a first single roll core, a second single roll core and two first connecting sheets, each first connecting sheet comprises a first bottom sheet part with a first alignment part and a bent first folding sheet part, a positive tab of the first single roll core and a positive tab of the second single roll core are arranged in parallel and clamped between the first bottom sheet part and the first folding sheet part of one first connecting sheet, and a negative tab of the first single roll core and a negative tab of the second single roll core are arranged in parallel and clamped between the first bottom sheet part and the first folding sheet part of the other first connecting sheet through welding connection;

the second pair of roll core units comprise a third single roll core, a fourth single roll core and two second connecting pieces, each second connecting piece comprises a second bottom piece part with a second alignment part and a bent second flange part, a positive tab of the third single roll core and a positive tab of the fourth single roll core are arranged in parallel and clamped between the second bottom piece part and the second flange part of one second connecting piece in a welded connection mode, and a negative tab of the third single roll core and a negative tab of the fourth single roll core are arranged in parallel and clamped between the second bottom piece part and the second flange part of the other second connecting piece in a welded connection mode;

the cover plate mechanism comprises a stop frame member, wherein the stop frame member is provided with a first positioning groove, a second positioning groove, a third positioning groove, a fourth positioning groove, a first through hole and a second through hole, at least parts of the first positioning groove and the second positioning groove are connected together, at least parts of the third positioning groove and the fourth positioning groove are connected together, the first through hole is positioned at the joint of the first positioning groove and the second positioning groove and penetrates through the stop frame member, and the second through hole is positioned at the joint of the third positioning groove and the fourth positioning groove and penetrates through the stop frame member;

the two first bottom plate parts are respectively arranged in the first positioning groove and the fourth positioning groove, the two second bottom plate parts are respectively arranged in the second positioning groove and the third positioning groove, and a first alignment part of the first bottom plate part in the first positioning groove is matched with a second alignment part of the second bottom plate part in the second positioning groove; the first alignment portion of the first bottom tab portion located in the fourth detent cooperates with the second alignment portion of the second bottom tab portion located in the third detent; first pair of book core unit with the second is to rolling up the core unit and following the back is piled to the thickness direction that first monomer rolled up the core with the middle department that the second monomer rolled up the core is in the dorsad the apron mechanism one side is buckled so that first monomer rolls up the core the second monomer rolls up the core the third monomer rolls up the core with the fourth monomer rolls up the core and piles up along its thickness direction, apron mechanism is located first monomer rolls up the core the second monomer rolls up the core the third monomer rolls up the core with the lateral wall department that the fourth monomer rolled up the core.

2. The battery based on multi-roll core parallel connection according to claim 1, wherein positive lugs of the first single roll core and the second single roll core are staggered with positive lugs of the third single roll core and the fourth single roll core in the length direction of the first single roll core; the first monomer rolls up the core the second monomer rolls up the negative pole ear of core with the third monomer rolls up the core the fourth monomer rolls up the negative pole ear of core and is in the setting of staggering in the length direction that the first monomer rolled up the core.

3. The battery based on the parallel connection of multiple winding cores according to claim 1, wherein the single winding core comprises a winding core body, a positive tab and a negative tab, and the positive tab and the negative tab are located at the same side of the winding core body and are located at the position close to the upper surface or the lower surface of the winding core body.

4. The battery based on the parallel connection of the multiple winding cores according to claim 1, wherein the end faces of the positive tab of the first single winding core and the positive tab of the second single winding core are aligned with each other and are subjected to ultrasonic welding, and the end faces of the negative tab of the first single winding core and the negative tab of the second single winding core are aligned with each other and are subjected to ultrasonic welding; the first bottom sheet part of one first connecting sheet, the bent first folding sheet part, the positive lug of the first single-body winding core and the positive lug of the second single-body winding core are welded through ultrasonic waves to form a first welding mark; and the first bottom piece part of the other first connecting piece, the bent first folding piece part, the negative pole ear of the first single-body winding core and the negative pole ear of the second single-body winding core are welded through ultrasonic waves to form a second welding mark.

5. The battery based on multi-roll core parallel connection according to claim 4, wherein before the first single roll core and the second single roll core are not bent, an insulating tape is attached to the side, facing away from the first base sheet, of the first fold sheet, and the insulating tape extends to the roll core body of the first single roll core and the roll core body of the second single roll core; the first bottom sheet portion faces back to the attached insulating adhesive tape on one side of the first folding sheet portion, and the insulating adhesive tape extends to the winding core body of the first single winding core and the winding core body of the second single winding core.

6. The multi-roll parallel battery according to claim 1, wherein one of the first and second aligning parts is in a boss shape and the other is in a recess shape, and the widths of the first and second aligning parts are smaller than the widths of the first, second, third and fourth positioning grooves.

7. The multi-winding core parallel battery according to claim 1, wherein the stopper member is made of an insulating material; the cover plate mechanism further comprises: the base plate component is stacked with the stop frame component, a first boss and a second boss are arranged on one side of the base plate component facing the stop frame component, a positive pole column electrically connected with the first boss and a negative pole column electrically connected with the second boss are arranged on one side of the base plate component facing away from the stop frame component, the first boss is inserted into the first through opening and is welded with a first bottom plate part of the first connecting piece at the positive lug position of the first pair of winding core units and a second bottom plate part of the second connecting piece at the positive lug position of the second pair of winding core units in a laser mode to form a fifth welding print; the second boss is inserted into the second through hole and is welded with the first bottom sheet part of the first connecting sheet at the negative electrode ears of the first pair of winding core units and the second bottom sheet part of the second connecting sheet at the negative electrode ears of the second pair of winding core units in a laser mode to form a sixth welding mark; attaching an insulating tape to one side of the fifth welding seal, which is far away from the cover plate mechanism; and attaching an insulating tape to one side of the sixth welding mark, which is far away from the cover plate mechanism.

8. The battery of claim 7, wherein the stopper member has a plurality of air holes; the base plate component is provided with a liquid injection hole and an explosion-proof valve mechanism, and the positions of the liquid injection hole and the explosion-proof valve mechanism correspond to the air hole.

9. The multi-roll core parallel battery according to claim 3, wherein before the first single roll core and the second single roll core are not bent, the first pair of roll core units and the second pair of roll core units are stacked in the thickness direction, the cover plate mechanism is located below the first pair of roll core units and the second pair of roll core units, the first pair of roll core units is closer to the cover plate mechanism than the second pair of roll core units, and the distance between the first single roll core and the second single roll core is greater than the distance between the third single roll core and the fourth single roll core; the positive electrode lug and the negative electrode lug of the first pair of winding core units and the second pair of winding core units are both positioned on the surface of the winding core body close to the cover plate mechanism; the positive tab and the negative tab of the second pair of roll core units are provided with first extending portions extending towards the cover plate mechanism direction, and second extending portions extending towards the width direction of the first single roll core, two ends of each first extending portion are respectively connected with the second extending portions and the roll core body, and the second extending portions are clamped on the second bottom sheet portions of the second connecting sheets and the second flange portions through welding connection.

10. A method of assembling a multi-winding parallel battery according to any one of claims 1 to 9, wherein the cover mechanism further comprises: a base plate member having a first boss and a second boss on one side thereof;

the assembly method comprises the following steps:

arranging a positive lug of a first single winding core and a positive lug of a second single winding core in parallel, clamping the positive lugs between a first bottom sheet part and a first folding sheet part of a first connecting sheet, and connecting the first connecting sheet with the positive lug of the first single winding core and the positive lug of the second single winding core through welding; arranging the negative pole lug of the first single-body winding core and the negative pole lug of the second single-body winding core in parallel, clamping the negative pole lug between the first bottom piece part and the first folding piece part of the other first connecting piece, and connecting the other first connecting piece with the negative pole lug of the first single-body winding core and the negative pole lug of the second single-body winding core through welding;

arranging a positive lug of a third single-body winding core and a positive lug of a fourth single-body winding core in parallel, clamping the positive lugs between a second bottom sheet part and a second flange part of a second connecting sheet, and connecting the second connecting sheet with the positive lug of the third single-body winding core and the positive lug of the fourth single-body winding core through welding; arranging the negative pole lug of the third single-body winding core and the negative pole lug of the fourth single-body winding core in parallel, clamping the negative pole lug between the second bottom piece part and the second flange part of the other second connecting piece, and connecting the other second connecting piece with the negative pole lug of the third single-body winding core and the negative pole lug of the fourth single-body winding core through welding;

installing two first bottom plate parts into the first positioning groove and the fourth positioning groove respectively for positioning, installing two second bottom plate parts into the second positioning groove and the third positioning groove respectively for positioning, wherein at the moment, a first alignment part of the first bottom plate part positioned in the first positioning groove is matched with a second alignment part of a second bottom plate part positioned in the second positioning groove, and a first alignment part of the first bottom plate part positioned in the fourth positioning groove is matched with a second alignment part of the second bottom plate part positioned in the third positioning groove; the stop frame member, the first pair of winding core units and the second pair of winding core units are stacked in sequence along the thickness direction of the first single winding core;

inserting a first boss of a base plate component into the first through opening, and performing laser welding with a first bottom plate part of the first connecting sheet at the positive lug position of the first pair of winding core units and a second bottom plate part of the second connecting sheet at the positive lug position of the second pair of winding core units; inserting a second boss of the substrate component into a second through hole to be welded with a first bottom sheet part of the first connecting sheet at the negative electrode lug of the first pair of winding core units and a second bottom sheet part of the second connecting sheet at the negative electrode lug of the second pair of winding core units in a laser welding mode;

after laser welding, the first pair of roll core units and the second pair of roll core units are arranged in the middle of the first single roll core and the second single roll core and are bent back to one side of the cover plate mechanism, the positive electrode lug and the negative electrode lug of the first pair of roll core units and the positive electrode lug and the negative electrode lug of the second pair of roll core units are bent to enable the first single roll core, the second single roll core, the third single roll core and the fourth single roll core to be stacked along the thickness direction of the first single roll core, the second single roll core, the third single roll core and the fourth single roll core, and the cover plate mechanism is arranged on the side wall of the first single roll core, the second single roll core, the third single roll core and the fourth single roll core.

Technical Field

The invention relates to the technical field of batteries, in particular to a battery based on multi-winding-core parallel connection and an assembly method thereof.

Background

At present, the assembly of the winding core of the power battery gradually adopts a four-winding core parallel assembly process, and the process comprises the following steps: firstly, combining two winding cores and carrying out ultrasonic pre-welding on a positive electrode lug and a negative electrode lug of the two winding cores; secondly, taking the other two winding cores, connecting the two winding cores in parallel, and then respectively carrying out ultrasonic pre-welding on the positive electrode lug and the negative electrode lug of each winding core; taking the two pairs of double winding cores after the pre-welding is finished, placing the corresponding tabs between the connecting sheets and the protective sheets, and then carrying out ultrasonic welding again; and fourthly, finally bending to realize the core combination of the four winding cores.

The process has the following manufacturing risk points: firstly, because the double winding cores are connected in parallel and then the third operation is carried out, the number of layers of the tab during welding is too large, and the phenomenon of insufficient welding of the tab during ultrasonic welding can be caused; secondly, during the operation of the third step, the connecting sheet and the protective sheet are difficult to position, the relative positions of the connecting sheet and the protective sheet are easy to deviate, and the connecting sheet lacks the positioning on the cover plate, so that the bad phenomena of insufficient welding and the like during laser welding are easy to occur; after the core is combined by the three-core and the four-core, the tab is easy to be seriously bent, and even the tab is reversely inserted into the core body, so that the phenomenon that the core is scrapped due to short circuit can occur; and fourthly, along with the increase of the number of the winding cores, the risk of the existing scheme is further increased, and the process adaptability is poor.

Disclosure of Invention

In order to overcome the above-mentioned drawbacks of the prior art, embodiments of the present invention provide a battery based on parallel connection of multiple winding cores and an assembly method thereof, which can solve at least one of the above-mentioned problems.

The specific technical scheme of the embodiment of the invention is as follows:

a multi-winding parallel-based battery, comprising:

the first pair of roll core units comprise a first single roll core, a second single roll core and two first connecting sheets, each first connecting sheet comprises a first bottom sheet part with a first alignment part and a bent first folding sheet part, a positive tab of the first single roll core and a positive tab of the second single roll core are arranged in parallel and clamped between the first bottom sheet part and the first folding sheet part of one first connecting sheet, and a negative tab of the first single roll core and a negative tab of the second single roll core are arranged in parallel and clamped between the first bottom sheet part and the first folding sheet part of the other first connecting sheet through welding connection;

the second pair of roll core units comprise a third single roll core, a fourth single roll core and two second connecting pieces, each second connecting piece comprises a second bottom piece part with a second alignment part and a bent second flange part, a positive tab of the third single roll core and a positive tab of the fourth single roll core are arranged in parallel and clamped between the second bottom piece part and the second flange part of one second connecting piece in a welded connection mode, and a negative tab of the third single roll core and a negative tab of the fourth single roll core are arranged in parallel and clamped between the second bottom piece part and the second flange part of the other second connecting piece in a welded connection mode;

the cover plate mechanism comprises a stop frame member, wherein the stop frame member is provided with a first positioning groove, a second positioning groove, a third positioning groove, a fourth positioning groove, a first through hole and a second through hole, at least parts of the first positioning groove and the second positioning groove are connected together, at least parts of the third positioning groove and the fourth positioning groove are connected together, the first through hole is positioned at the joint of the first positioning groove and the second positioning groove and penetrates through the stop frame member, and the second through hole is positioned at the joint of the third positioning groove and the fourth positioning groove and penetrates through the stop frame member;

the two first bottom plate parts are respectively arranged in the first positioning groove and the fourth positioning groove, the two second bottom plate parts are respectively arranged in the second positioning groove and the third positioning groove, and a first alignment part of the first bottom plate part in the first positioning groove is matched with a second alignment part of the second bottom plate part in the second positioning groove; the first alignment portion of the first bottom tab portion located in the fourth detent cooperates with the second alignment portion of the second bottom tab portion located in the third detent; first pair of book core unit with the second is to rolling up the core unit and following the back is piled to the thickness direction that first monomer rolled up the core with the middle department that the second monomer rolled up the core is in the dorsad the apron mechanism one side is buckled so that first monomer rolls up the core the second monomer rolls up the core the third monomer rolls up the core with the fourth monomer rolls up the core and piles up along its thickness direction, apron mechanism is located first monomer rolls up the core the second monomer rolls up the core the third monomer rolls up the core with the lateral wall department that the fourth monomer rolled up the core.

Preferably, the positive lugs of the first single winding core and the second single winding core, the positive lugs of the third single winding core and the positive lugs of the fourth single winding core are arranged in a staggered manner in the length direction of the first single winding core; the first monomer rolls up the core the second monomer rolls up the negative pole ear of core with the third monomer rolls up the core the fourth monomer rolls up the negative pole ear of core and is in the setting of staggering in the length direction that the first monomer rolled up the core.

Preferably, the monomer rolls up the core including rolling up core body, anodal ear and negative pole ear, anodal ear with the negative pole ear is located roll up same side department of core body, and be located and be close to roll up the upper surface or the lower surface department of core body.

Preferably, the end faces of the positive tab of the first single winding core and the positive tab of the second single winding core are aligned with each other and subjected to ultrasonic welding, and the end faces of the negative tab of the first single winding core and the negative tab of the second single winding core are aligned with each other and subjected to ultrasonic welding; the first bottom sheet part of one first connecting sheet, the bent first folding sheet part, the positive lug of the first single-body winding core and the positive lug of the second single-body winding core are welded through ultrasonic waves to form a first welding mark; and the first bottom piece part of the other first connecting piece, the bent first folding piece part, the negative pole ear of the first single-body winding core and the negative pole ear of the second single-body winding core are welded through ultrasonic waves to form a second welding mark.

Preferably, before the first single winding core and the second single winding core are not bent, an insulating tape is attached to one side, facing away from the first bottom plate part, of the first folding plate part, and the insulating tape extends to the winding core body of the first single winding core and the winding core body of the second single winding core; the first bottom sheet portion faces back to the attached insulating adhesive tape on one side of the first folding sheet portion, and the insulating adhesive tape extends to the winding core body of the first single winding core and the winding core body of the second single winding core.

Preferably, one of the first alignment portion and the second alignment portion is in a boss shape, and the other is in a recess shape, and widths of the first alignment portion and the second alignment portion are smaller than widths of the first positioning groove, the second positioning groove, the third positioning groove, and the fourth positioning groove.

Preferably, the stopper frame member is made of an insulating material; the cover plate mechanism further comprises: the base plate component is stacked with the stop frame component, a first boss and a second boss are arranged on one side of the base plate component facing the stop frame component, a positive pole column electrically connected with the first boss and a negative pole column electrically connected with the second boss are arranged on one side of the base plate component facing away from the stop frame component, the first boss is inserted into the first through opening and is welded with a first bottom plate part of the first connecting piece at the positive lug position of the first pair of winding core units and a second bottom plate part of the second connecting piece at the positive lug position of the second pair of winding core units in a laser mode to form a fifth welding print; the second boss is inserted into the second through hole and is welded with the first bottom sheet part of the first connecting sheet at the negative electrode ears of the first pair of winding core units and the second bottom sheet part of the second connecting sheet at the negative electrode ears of the second pair of winding core units in a laser mode to form a sixth welding mark; attaching an insulating tape to one side of the fifth welding seal, which is far away from the cover plate mechanism; and attaching an insulating tape to one side of the sixth welding mark, which is far away from the cover plate mechanism.

Preferably, the stop frame member is provided with a plurality of air holes; the base plate component is provided with a liquid injection hole and an explosion-proof valve mechanism, and the positions of the liquid injection hole and the explosion-proof valve mechanism correspond to the air hole.

Preferably, before the first single core and the second single core are not bent, the first pair of core units and the second pair of core units are stacked in the thickness direction, the cover plate mechanism is located below the space between the first pair of core units and the second pair of core units, the first pair of core units is closer to the cover plate mechanism than the second pair of core units, and the distance between the first single core and the second single core is greater than the distance between the third single core and the fourth single core; the positive electrode lug and the negative electrode lug of the first pair of winding core units and the second pair of winding core units are both positioned on the surface of the winding core body close to the cover plate mechanism; the positive tab and the negative tab of the second pair of roll core units are provided with first extending portions extending towards the cover plate mechanism direction, and second extending portions extending towards the width direction of the first single roll core, two ends of each first extending portion are respectively connected with the second extending portions and the roll core body, and the second extending portions are clamped on the second bottom sheet portions of the second connecting sheets and the second flange portions through welding connection.

A method for assembling a battery based on multi-winding core parallel connection according to any one of the above claims, wherein the cover plate mechanism further comprises: a base plate member having a first boss and a second boss on one side thereof;

the assembly method comprises the following steps:

arranging a positive lug of a first single winding core and a positive lug of a second single winding core in parallel, clamping the positive lugs between a first bottom sheet part and a first folding sheet part of a first connecting sheet, and connecting the first connecting sheet with the positive lug of the first single winding core and the positive lug of the second single winding core through welding; arranging the negative pole lug of the first single-body winding core and the negative pole lug of the second single-body winding core in parallel, clamping the negative pole lug between the first bottom piece part and the first folding piece part of the other first connecting piece, and connecting the other first connecting piece with the negative pole lug of the first single-body winding core and the negative pole lug of the second single-body winding core through welding;

arranging a positive lug of a third single-body winding core and a positive lug of a fourth single-body winding core in parallel, clamping the positive lugs between a second bottom sheet part and a second flange part of a second connecting sheet, and connecting the second connecting sheet with the positive lug of the third single-body winding core and the positive lug of the fourth single-body winding core through welding; arranging the negative pole lug of the third single-body winding core and the negative pole lug of the fourth single-body winding core in parallel, clamping the negative pole lug between the second bottom piece part and the second flange part of the other second connecting piece, and connecting the other second connecting piece with the negative pole lug of the third single-body winding core and the negative pole lug of the fourth single-body winding core through welding;

installing two first bottom plate parts into the first positioning groove and the fourth positioning groove respectively for positioning, installing two second bottom plate parts into the second positioning groove and the third positioning groove respectively for positioning, wherein at the moment, a first alignment part of the first bottom plate part positioned in the first positioning groove is matched with a second alignment part of a second bottom plate part positioned in the second positioning groove, and a first alignment part of the first bottom plate part positioned in the fourth positioning groove is matched with a second alignment part of the second bottom plate part positioned in the third positioning groove; the stop frame member, the first pair of winding core units and the second pair of winding core units are stacked in sequence along the thickness direction of the first single winding core;

inserting a first boss of a base plate component into the first through opening, and performing laser welding with a first bottom plate part of the first connecting sheet at the positive lug position of the first pair of winding core units and a second bottom plate part of the second connecting sheet at the positive lug position of the second pair of winding core units; inserting a second boss of the substrate component into a second through hole to be welded with a first bottom sheet part of the first connecting sheet at the negative electrode lug of the first pair of winding core units and a second bottom sheet part of the second connecting sheet at the negative electrode lug of the second pair of winding core units in a laser welding mode;

after laser welding, the first pair of roll core units and the second pair of roll core units are arranged in the middle of the first single roll core and the second single roll core and are bent back to one side of the cover plate mechanism, the positive electrode lug and the negative electrode lug of the first pair of roll core units and the positive electrode lug and the negative electrode lug of the second pair of roll core units are bent to enable the first single roll core, the second single roll core, the third single roll core and the fourth single roll core to be stacked along the thickness direction of the first single roll core, the second single roll core, the third single roll core and the fourth single roll core, and the cover plate mechanism is arranged on the side wall of the first single roll core, the second single roll core, the third single roll core and the fourth single roll core.

The technical scheme of the invention has the following remarkable beneficial effects:

the first monomer that first pair rolled up the core unit in this application rolls up core, the second monomer rolls up the positive ear and the negative pole ear of core and welds respectively through first connection piece together earlier, and the third monomer rolls up the core, the positive ear and the negative pole ear that the core was rolled up to the fourth monomer welds together through the second connection piece respectively to realize the welding of part utmost point ear earlier, avoid the too much emergence that leads to the virtual welding phenomenon of utmost point ear number of piles. Two first film part sets up respectively first positioning groove with in the fourth positioning groove, two second film part sets up respectively second positioning groove with in the third positioning groove to fix a position first connection piece, second connection piece, and then realize fixing a position positive ear and the negative pole ear that roll up the core to all monomers, the later stage of being convenient for at first monomer roll core with the centre department that the core was rolled up to the second monomer is towards dorsad the design control that the utmost point ear was buckled when lid mechanism one side was buckled avoids utmost point ear anti-insert to roll up the core body, causes the condemned phenomenon of a roll core short circuit. The first alignment portion of the first bottom tab portion in the first detent cooperates with the second alignment portion of the second bottom tab portion in the second detent, the first alignment portion of the first bottom tab portion in the fourth detent cooperates with the second alignment portion of the second bottom tab portion in the third detent, the first through opening is positioned at the joint of the first positioning groove and the second positioning groove, and penetrates through the stop frame member, the second penetrating opening is positioned at the connecting part of the third positioning groove and the fourth positioning groove, the first through hole and the second through hole can respectively realize the electrical connection between the corresponding first aligning part and the second aligning part, therefore, the electric connection of all the positive lugs and the electric connection of all the negative lugs are realized, and the phenomenon of virtual welding caused by excessive layers of the lugs is avoided to the greatest extent.

Specific embodiments of the present invention are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the invention may be employed. It should be understood that the embodiments of the invention are not so limited in scope. Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments, in combination with or instead of the features of the other embodiments.

Drawings

The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may choose from the various possible shapes and proportional sizes to implement the invention as a matter of case.

FIG. 1 is a schematic structural diagram of a single core in an embodiment of the present invention;

FIG. 2 is a top view of the first pair of core units of the present invention before the first connecting tab is bent and welded;

FIG. 3 is a side view of the first pair of core units of the present invention prior to the unbent welding of the first connecting tab;

FIG. 4 is a top view of a first attachment tab in accordance with an embodiment of the present invention in a first embodiment;

FIG. 5 is a top view of the first connecting piece of the first pair of core units after bending and welding in the embodiment of the invention;

FIG. 6 is a top view of the front side of the adhesive tape after the first connecting piece of the first pair of core units is bent and welded according to the embodiment of the invention;

FIG. 7 is a top view of the back side of the adhesive after the first connecting tab of the first pair of core units is bent and welded according to the embodiment of the invention;

FIG. 8 is a top view of the second pair of core units of the present invention before the second web is bent and welded;

FIG. 9 is a top view of a second strap in accordance with an embodiment of the present invention in a first embodiment;

FIG. 10 is a top view of the second pair of core units after the second connecting piece is bent and welded according to the embodiment of the invention;

FIG. 11 is a top view of the front side of the adhesive after the second connecting piece of the second pair of core units is bent and welded according to the embodiment of the invention;

FIG. 12 is a top view of the back side of the tape after the second web of the second pair of core units has been bend welded in accordance with an embodiment of the present invention;

FIG. 13 is a top view of the cover mechanism facing the first pair of core units and the second pair of core units in an embodiment of the invention;

FIG. 14 is a top view of the cover mechanism of an embodiment of the present invention facing away from the first pair of core units and the second pair of core units;

FIG. 15 is a three-dimensional view of a lid plate mechanism in an embodiment of the invention;

FIG. 16 is a front view of a stop frame member in an embodiment of the present invention;

FIG. 17 is a rear view of a stop frame member in an embodiment of the present invention;

FIG. 18 is a front view of a base plate member in an embodiment of the invention;

FIG. 19 is a rear view of a substrate member in an embodiment of the invention;

FIG. 20 is a top view of a first pair of core units in cooperation with a deck plate mechanism in accordance with an embodiment of the present invention;

FIG. 21 is a partial enlarged view of FIG. 20;

FIG. 22 is a top view of the first pair of core units and the second pair of core units in cooperation with the deck plate mechanism in accordance with the present invention;

FIG. 23 is a side view of the first pair of core units and the second pair of core units in cooperation with a deck plate mechanism according to an embodiment of the present invention;

FIG. 24 is a partial enlarged view of FIG. 23;

FIG. 25 is a schematic view of a first pair of core units, a second pair of core units and a cover plate mechanism after welding in accordance with an embodiment of the present invention;

FIG. 26 is a schematic view of the first pair of core units and the second pair of core units being bonded to the cover plate mechanism and then glued in accordance with an embodiment of the present invention;

FIG. 27 is a schematic structural diagram of a core of 4 single cores in the embodiment of the present invention;

FIG. 28 is a left side view of a 4 core cell in accordance with an embodiment of the present invention;

FIG. 29 is a right side view of a 4 single cores after being combined;

FIG. 30 is a top view of a second embodiment of a first attachment tab in accordance with an example of the present invention;

fig. 31 is a three-dimensional view of a first connecting piece in a second embodiment according to an example of the invention.

Reference numerals of the above figures:

1. a first single roll core; 2. a second single roll core; 3. a first connecting piece; 31. a first bottom sheet portion; 311. a first alignment portion; 32. a first tab portion; 33. a connecting portion; 34. a through hole; 4. a third single roll core; 5. a fourth single roll core; 6. a second connecting sheet; 61. a second chassis section; 611. a second alignment portion; 62. a second tab portion; 7. a stop frame member; 71. a first positioning groove; 72. a second positioning groove; 73. a third positioning groove; 74. a fourth positioning groove; 75. a first through opening; 76. a second through hole; 77. air holes; 78. a first limiting part; 79. a second limiting part; 8. a substrate member; 81. a first boss; 82. a second boss; 83. a positive post; 84. a negative pole post; 85. a liquid injection hole; 86. an explosion-proof valve mechanism; 9. an insulating tape; 10. a first extension portion; 11. a second extension portion; 13. first welding and printing; 14. second welding and printing; 15. third welding and printing; 16. fourth welding and printing; 17. fifth welding and printing; 18. sixth welding and printing; 19. fixing the adhesive tape; 100. a roll core body; 200. a positive tab; 300. and a negative tab.

Detailed Description

The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the invention in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention. It will be understood that when an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, mechanical or electrical connections, communications between two elements, direct connections, indirect connections through intermediaries, and the like. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In order to solve difficult design control, connection piece location difficulty, the too much problem that easily appears the rosin joint phenomenon in the utmost point ear number of piles when utmost point ear is buckled at least, provided a battery based on many book core are parallelly connected in this application, as shown in fig. 1 to 31, the parallelly connected battery of core can include based on many book: the first pair of winding core units comprise a first single winding core 1, a second single winding core 2 and two first connecting sheets 3, wherein each first connecting sheet 3 comprises a first bottom sheet part 31 with a first alignment part 311 and a bent first folding sheet part 32, a positive tab 200 of the first single winding core 1 and a positive tab 200 of the second single winding core 2 are arranged in parallel and clamped between the first bottom sheet part 31 and the first folding sheet part 32 of one first connecting sheet 3 through welding connection, and a negative tab 300 of the first single winding core 1 and a negative tab 300 of the second single winding core 2 are arranged in parallel and clamped between the first bottom sheet part 31 and the first folding sheet part 32 of the other first connecting sheet 3 through welding connection; the second pair of winding core units comprise a third single winding core 4, a fourth single winding core 5 and two second connecting sheets 6, each second connecting sheet 6 comprises a second bottom sheet part 61 with a second alignment part 611 and a bent second tab part 62, a positive tab 200 of the third single winding core 4 and a positive tab 200 of the fourth single winding core 5 are arranged in parallel and clamped between the second bottom sheet part 61 and the second tab part 62 of one second connecting sheet 6 and are connected by welding, and a negative tab 300 of the third single winding core 4 and a negative tab 300 of the fourth single winding core 5 are arranged in parallel and are clamped between the second bottom sheet part 61 and the second tab part 62 of the other second connecting sheet 6 and are connected by welding; the cover plate mechanism comprises a stop frame member 7, wherein the stop frame member 7 is provided with a first positioning groove 71, a second positioning groove 72, a third positioning groove 73, a fourth positioning groove 74, a first through hole 75 and a second through hole 76, the first positioning groove 71 and the second positioning groove 72 are at least partially connected together, the third positioning groove 73 and the fourth positioning groove 74 are at least partially connected together, the first through hole 75 is positioned at the joint of the first positioning groove 71 and the second positioning groove 72 and penetrates through the stop frame member 7, and the second through hole 76 is positioned at the joint of the third positioning groove 73 and the fourth positioning groove 74 and penetrates through the stop frame member 7; the two first bottom plate portions 31 are respectively disposed in the first positioning groove 71 and the fourth positioning groove 74, the two second bottom plate portions 61 are respectively disposed in the second positioning groove 72 and the third positioning groove 73, and the first alignment portion 311 of the first bottom plate portion 31 located in the first positioning groove 71 is fitted with the second alignment portion 611 of the second bottom plate portion 61 located in the second positioning groove 72; the first alignment portion 311 of the first bottom plate portion 31 located in the fourth positioning groove 74 is fitted with the second alignment portion 611 of the second bottom plate portion 61 located in the third positioning groove 73; first pair of book core unit and second pair roll up the core unit and roll up the thickness direction of core 1 and pile the back at first monomer and roll up core 1 and second monomer and roll up core 2 middle department and buckle to what the cover plate mechanism one side was rolled up in the back so that first monomer rolls up core 1, second monomer and rolls up core 2, third monomer and roll up core 4 and fourth monomer and roll up core 5 and pile up along its thickness direction, and the cover plate mechanism is located the lateral wall department that first monomer rolled up core 1, second monomer rolled up core 2, third monomer rolled up core 4 and fourth monomer rolled up core 5.

The first monomer that first pair rolled up the core unit in this application rolls up core 1, the core 2 was rolled up to the second monomer anodal ear 200 and negative pole ear 300 welds through first connection piece 3 respectively earlier and is in the same place, and the third monomer rolls up core 4, the core 5 was rolled up to the fourth monomer anodal ear 200 and negative pole ear 300 welds through second connection piece 6 respectively and is in the same place to realize the welding of part utmost point ear earlier, avoid the too much emergence that leads to virtual welding phenomenon of utmost point ear number of piles. Two first bottom plate portions 31 set up respectively in first positioning groove 71 and fourth positioning groove 74, two second bottom plate portions 61 set up respectively in second positioning groove 72 and third positioning groove 73, thereby to first connection piece 3, second connection piece 6 fixes a position, and then realize the location to anodal ear 200 and the negative pole ear 300 that all monomers rolled up the core, the later stage of being convenient for is rolled up the design control that the utmost point ear was buckled when locating to buckling to lid mechanism one side dorsad in the middle of first monomer book core 1 and second monomer book core 2, avoid utmost point ear anti-insertion to roll up core body 100, cause the condemned phenomenon of a roll core short circuit. The first alignment portion 311 of the first bottom plate portion 31 located in the first positioning recess 71 is engaged with the second alignment portion 611 of the second bottom plate portion 61 located in the second positioning recess 72, the first alignment portion 311 of the first bottom plate portion 31 located in the fourth positioning recess 74 is engaged with the second alignment portion 611 of the second bottom plate portion 61 located in the third positioning recess 73, the first through-hole 75 is located at the junction of the first positioning recess 71 and the second positioning recess 72, and penetrates through the stop frame member 7, the second penetration hole 76 is located at the junction of the third positioning groove 73 and the fourth positioning groove 74, the electrical connection between the corresponding first alignment portion 311 and the second alignment portion 611 can be achieved through the first through opening 75 and the second through opening 76, therefore, the electrical connection of all the positive electrode tabs 200 and the electrical connection of all the negative electrode tabs 300 are realized, and the phenomenon of virtual welding caused by excessive tab layers is avoided to the greatest extent.

In order to better understand the battery based on the parallel connection of the multiple winding cores in the present application, it will be further explained and explained below. As shown in fig. 1 to 31, the battery based on the parallel connection of the plurality of winding cores may include: the core mechanism comprises a first pair of core units, a second pair of core units and a cover plate mechanism. The first pair of winding core units can comprise a first single winding core 1, a second single winding core 2 and two first connecting pieces 3. The second pair of core units may include a third single core 4, a fourth single core 5, and two second tabs 6. The cover plate mechanism includes a stopper frame member 7.

As shown in fig. 1, the single winding core in the first single winding core 1, the second single winding core 2, the third single winding core 4 and the fourth single winding core 5 may include a winding core body 100, a positive tab 200 and a negative tab 300. The positive tab 200 and the negative tab 300 are located on the same side of the winding core body 100 and located near the upper surface or the lower surface of the winding core body 100, the surface facing upward is the upper surface of the winding core body 100, and the surface facing downward is the lower surface of the winding core body 100. In fig. 1, it should be noted that: the thickness direction that the core was rolled up to the monomer is the Z axle, and the length direction that the core was rolled up to the monomer is the X axle, and the width direction that the core was rolled up to the monomer is the Y axle.

As shown in fig. 4, the first connecting piece 3 includes a first base piece portion 31 having a first alignment portion 311 and a folded first tab portion 32. First tab portion 32 is less than the width of first base plate portion 31 in vertical direction at the width of vertical direction, so, first tab portion 32 has certain clearance apart from the monomer core that rolls up, and this clearance can guarantee utmost point ear deformation position when buckling to realize the design control that utmost point ear was buckled, avoid utmost point ear anti-insert to roll up core body 100 to a certain extent, cause the condemned phenomenon of core short circuit.

As shown in fig. 4, a plurality of through holes 34 arranged in a vertical direction may be opened at a connection portion (i.e., a bending position) between the first base sheet portion 31 and the first tab portion 32 of the first connecting sheet 3, so that the first tab portion 32 is bent in a straight line of the through holes 34. Similarly, the second connecting piece 6 may have a structure similar to that of the first connecting piece 3. The first alignment portion 311 is located at an end of the first base portion 31 remote from the first tab portion 32, such that the first alignment portion 311 can be engaged with the second alignment portion 611 of the second connecting piece 6.

As shown in fig. 30 to 31, the first base panel portion 31 and the first tab portion 32 of the first connecting piece 3 may be connected by a multi-layered connecting portion 33, and the multi-layered connecting portion 33 may be formed of a multi-layered metal foil. The function of the multi-layer connecting portion 33 is to facilitate the bending of the first connecting piece 3 and to reduce the risk of breaking at the bending. Similarly, the second connecting piece 6 may have a structure similar to that of the first connecting piece 3. In this embodiment, the thicknesses of the first chassis portion 31 and the first tab portion 32 may be the same or different.

As shown in fig. 2, 3 and 5, the positive tab 200 of the first cell winding core 1 and the positive tab 200 of the second cell winding core 2 are arranged in parallel and interposed between the first base tab portion 31 and the first tab portion 32 of one first connecting tab 3, and are connected by welding. The negative electrode tab 300 of the first single winding core 1 and the negative electrode tab 300 of the second single winding core 2 are arranged in parallel and are sandwiched between the first base tab portion 31 and the first tab portion 32 of the other first tab 3, and are connected by welding. As a practical matter, the end faces of the positive tab 200 of the first cell winding core 1 and the positive tab 200 of the second cell winding core 2 are aligned with each other and are ultrasonically welded. The end faces of the negative electrode tab 300 of the first single winding core 1 and the negative electrode tab 300 of the second single winding core 2 are aligned with each other and are subjected to ultrasonic welding. By means of the mode, the phenomenon that the lug is loose and the subsequent welding effect is influenced can be effectively prevented. Then, as shown in fig. 5, the first base tab portion 31 and the bent first tab portion 32 of one first connecting tab 3 are ultrasonically welded to the positive tab 200 of the first cell core 1 and the positive tab 200 of the second cell core 2 to form a first welding mark 13; the first base tab portion 31 and the bent first tab portion 32 of the other first connecting tab 3 are ultrasonically welded to the negative tab 300 of the first single-body winding core 1 and the negative tab 300 of the second single-body winding core 2 to form the second weld 14.

In the above structure, as shown in fig. 5, the first aligning portions 311 of the first base plate portions 31 of the two first connecting pieces 3 are directed toward each other so as to be able to be fitted with the second aligning portions 611 of the second base plate portions 61 of the second connecting pieces 6 corresponding thereto, respectively. The first base piece portion 31, the bent first tab portion 32 of the first connection piece 3 and the positive tab 200 of the first cell core 1 have a partial first solder mark 13 in a region overlapping in a direction perpendicular to the paper surface. The first base piece portion 31, the bent first tab portion 32 of the first connecting piece 3 and the positive tab 200 of the second cell core 2 have a partial first solder mark 13 in a region overlapping in a direction perpendicular to the paper surface. Similarly, the first base tab portion 31, the bent first tab portion 32 of the first connection tab 3 and the negative electrode tab 300 of the first single core 1 have a part of the second solder mark 14 in the region overlapping in the direction perpendicular to the paper surface. The first base piece portion 31, the bent first tab portion 32 of the first connection piece 3 and the negative electrode tab 300 of the second single winding core 2 have a part of the second solder mark 14 in a region overlapping in a direction perpendicular to the paper surface. Through the mode, the firmness of welding of the first connecting piece 3 with the positive lug 200 of the first single rolling core 1 and the positive lug 200 of the second single rolling core 2 can be effectively guaranteed, and the firmness of welding of the other first connecting piece 3 with the negative lug 300 of the first single rolling core 1 and the negative lug 300 of the second single rolling core 2 can be effectively guaranteed.

As shown in fig. 6, before the first single-body winding core 1 and the second single-body winding core 2 are not bent, the insulating tape 9 is attached to the side of the first tab portion 32 facing away from the first base portion 31, and the insulating tape 9 extends to the winding core body 100 of the first single-body winding core 1 and the winding core body 100 of the second single-body winding core 2. As shown in fig. 7, the side of the first bottom plate portion 31 opposite to the first tab portion 32 is attached with the insulating tape 9, and the insulating tape 9 extends to the core body 100 of the first single core 1 and the core body 100 of the second single core 2. Through the structure, the first welding mark 13 and the second welding mark 14 can be protected, and welding dust is prevented from entering the winding core body 100.

As a practical matter, the material of the first connection tab 3 corresponding to the positive tab 200 of the first and second single-body winding cores 1 and 2 may be preferably selected from aluminum, and the material of the first connection tab 3 corresponding to the negative tab 300 of the first and second single-body winding cores 1 and 2 may be preferably selected from copper. Similarly, positive electrode tab 200 may preferably be made of an aluminum material, and negative electrode tab 300 may preferably be made of a copper material. This facilitates ultrasonic welding and also reduces the resistance of the battery.

As shown in fig. 9, the second connecting piece 6 may include a second base piece portion 61 having a second alignment portion 611 and a folded second tab portion 62. The second connecting piece 6 may have a structure similar to that of the first connecting piece 3, and will not be described in detail. Second tab portion 62 is less than the width of second base plate portion 61 in vertical direction at the width of vertical direction, so, second tab portion 62 has certain clearance apart from the monomer core that rolls up, and this clearance can guarantee utmost point ear deformation position when buckling to realize the design control that utmost point ear was buckled, avoid utmost point ear anti-insert to roll up core body 100 to a certain extent, cause to roll up the condemned phenomenon of core short circuit.

As shown in fig. 8 and 10, the positive tab 200 of the third unit winding core 4 and the positive tab 200 of the fourth unit winding core 5 are arranged in parallel and interposed between the second base piece portion 61 and the second tab portion 62 of the one second tab 6, and are connected by welding. The negative electrode tab 300 of the third single winding core 4 and the negative electrode tab 300 of the fourth single winding core 5 are arranged in parallel and are clamped between the second base tab part 61 and the second tab part 62 of the other second connecting piece 6 to be connected by welding. As a practical matter, the end faces of the positive tab 200 of the third cell winding core 4 and the positive tab 200 of the fourth cell winding core 5 are aligned with each other and are ultrasonically welded. The end faces of the negative electrode tab 300 of the third single winding core 4 and the negative electrode tab 300 of the fourth single winding core 5 are aligned with each other and are ultrasonically welded. By means of the mode, the phenomenon that the lug is loose and the subsequent welding effect is influenced can be effectively prevented. Then, as shown in fig. 10, the second base tab portion 61 and the bent second tab portion 62 of one second connecting tab 6 are ultrasonically welded to the positive tab 200 of the third single-body winding core 4 and the positive tab 200 of the fourth single-body winding core 5 to form a third welding mark 15; the second bottom tab part 61 and the bent second tab part 62 of the other second connecting piece 6 are ultrasonically welded with the negative tab 300 of the third single-body winding core 4 and the negative tab 300 of the fourth single-body winding core 5 to form the fourth welding mark 16.

As shown in fig. 8, 10, and 22, the positive electrode tab 200 of the first single winding core 1 or the second single winding core 2 is offset from the positive electrode tab 200 of the third single winding core 4 or the fourth single winding core 5 in the longitudinal direction of the first single winding core 1. The first monomer rolls up core 1, the second monomer rolls up core 2 negative pole ear 300 and the third monomer rolls up core 4, the fourth monomer rolls up core 5 negative pole ear 300 and the setting of staggering on the length direction that the core 1 was rolled up to the first monomer. Thus, when the positive lug 200 of the first single winding core 1 and the second single winding core 2 and the positive lug 200 of the third single winding core 4 and the fourth single winding core 5 are installed on the stop frame component 7, mutual interference can not occur. The negative electrode lug 300 of the first single roll core 1 and the second single roll core 2 is the same as the negative electrode lug 300 of the third single roll core 4 and the fourth single roll core 5.

In the above structure, as shown in fig. 8 and 10, the second alignment portions 611 of the second bottom plate portions 61 of the two second connecting pieces 6 are directed away from each other so as to be able to be engaged with the first alignment portions 311 of the first bottom plate portions 31 of the respective corresponding first connecting pieces 3. The second base piece portion 61, the bent second tab portion 62 of the second tab 6 and the positive tab 200 of the third cell winding core 4 have a partial third solder mark 15 in a region overlapping in a direction perpendicular to the paper surface. The second base piece portion 61, the folded second tab portion 62 of the second tab 6 and the positive tab 200 of the fourth cell winding core 5 have a partial fourth solder mark 16 in a region overlapping in a direction perpendicular to the paper surface. Similarly, the second base portion 61, the bent second tab portion 62 of the second connecting piece 6 and the negative electrode tab 300 of the third single-body winding core 4 have a partial fourth welding mark 16 in the region where they overlap in the direction perpendicular to the paper surface. The second base portion 61 and the bent second tab portion 62 of the second connecting piece 6 and the negative electrode tab 300 of the fourth single-body winding core 5 have a partial fourth weld 16 in a region overlapping in a direction perpendicular to the paper surface. In this way, can effectively guarantee that a second connection piece 6 rolls up core 1's anodal ear 200, the second monomer respectively and rolls up core 2's anodal ear 200 welded fastness with first monomer, and another second connection piece 6 rolls up core 1's negative pole ear 300, the second monomer respectively and rolls up core 2's negative pole ear 300 welded fastness with first monomer.

As shown in fig. 16 to 17, the cover plate mechanism may include the stopper frame member 7. The stopper frame member 7 may be made of an insulating material. The stop frame member 7 is provided with a first positioning groove 71, a second positioning groove 72, a third positioning groove 73, a fourth positioning groove 74, a first through opening 75 and a second through opening 76, wherein the first positioning groove 71 and the second positioning groove 72 are at least partially connected together, the third positioning groove 73 and the fourth positioning groove 74 are at least partially connected together, the first through opening 75 is positioned at the joint of the first positioning groove 71 and the second positioning groove 72 and penetrates through the stop frame member 7, and the second through opening 76 is positioned at the joint of the third positioning groove 73 and the fourth positioning groove 74 and penetrates through the stop frame member 7. The position of the first positioning groove 71 corresponds to the position of the first connecting piece 3 of the positive tab 200 clamping the first single winding core 1 and the second single winding core 2, and the shape of the first positioning groove is matched with that of the first bottom piece part 31 of the first connecting piece 3, so that the first bottom piece part 31 of the first connecting piece 3 can be positioned. The position of the second positioning groove 72 corresponds to the position of the second connecting piece 6 of the positive tab 200 clamping the third single-body winding core 4 and the fourth single-body winding core 5, and the shape of the second positioning groove is matched with that of the second bottom piece part 61 of the second connecting piece 6. The third positioning groove 73 corresponds to the second connecting piece 6 of the negative tab 300 sandwiching the third single winding core 4 and the fourth single winding core 5, and has a shape matching the second bottom piece portion 61 of the second connecting piece 6. The position of the fourth positioning groove 74 corresponds to the position of the first connecting piece 3 of the positive tab 200 clamping the first single winding core 1 and the second single winding core 2, and the shape of the fourth positioning groove is matched with the first bottom piece part 31 of the first connecting piece 3. The stopper frame member 7 has a first stopper portion 78 that partially separates the first positioning groove 71 from the second positioning groove 72, and a second stopper portion 79 that partially separates the third positioning groove 73 from the fourth positioning groove 74, which is advantageous for improving the accuracy and stability of the stopper.

As shown in fig. 20 and 21, the first pair of core units is disposed on the side of the stopper frame member 7 having the first positioning groove 71. The two first bottom plate portions 31 are respectively disposed in the first positioning groove 71 and the fourth positioning groove 74 (the insulating tape 9 is omitted in the drawing). The distance between the winding core body 100 of the first single winding core 1 and the winding core body 100 of the second single winding core 2 is approximately equal to or slightly larger than the width of the stop frame member 7 in the vertical direction, so that the heights of the four single winding cores after bending are basically equal to the width of the stop frame member 7.

As shown in fig. 22, 23 and 24, the second pair of core units is disposed on the side of the first pair of core units facing away from the stopper frame member 7. The two second bottom plate portions 61 are respectively disposed in the second positioning groove 72 and the third positioning groove. Before first monomer rolls up core 1 and second monomer and rolls up core 2 and do not buckle, first pair of book core unit and second are to rolling up the core unit and piling up along thickness direction, and cover the below that core unit between the core unit is rolled up to first pair of core unit and second, and first pair of core unit is more close to cover the core mechanism than second is to rolling up the core unit. In order to compensate for the distance between the second pair of winding core units and the stop frame member 7, namely the thickness of the first pair of winding core units, the positive electrode tab 200 and the negative electrode tab 300 of the second pair of winding core units are respectively provided with a first extending portion 10 extending towards the cover plate mechanism direction, a second extending portion 11 extending towards the width direction of the first single winding core 1, two ends of the first extending portion 10 are respectively connected with the second extending portion 11 and the winding core body 100, and the second extending portion 11 is clamped between the second bottom plate portion 61 and the second flange portion 62 of the second connecting piece 6 and connected through welding.

In whole structure, as shown in fig. 23 and 24, for the convenience of later stage in the middle of first monomer core 1 and second monomer core 2, the core is bent to the cover plate mechanism side in a reverse direction so that first monomer core 1, second monomer core 2, third monomer core 4 and fourth monomer core 5 are stacked along the thickness direction thereof, the problem that the local bending degree of the tab is too large and the tab is broken is avoided, and the positive tab 200 and the negative tab 300 of the first pair of core unit and the second pair of core unit are both located on the surface of the core body 100 close to the cover plate mechanism. Because the middle department that first monomer rolled up core 1 and second monomer rolled up core 2 is to the back apron mechanism one side back of the body back of buckling the back, and the second is to rolling up the inside that the core unit is located first pair of core unit, consequently, before bending, the distance that third monomer rolled up between core 4 and the fourth monomer rolled up core 5 can be less than the distance that first monomer rolled up core 1 and second monomer rolled up between core 2.

As shown in fig. 22, the first alignment portion 311 of the first bottom plate portion 31 located in the first positioning recess 71 is fitted with the second alignment portion 611 of the second bottom plate portion 61 located in the second positioning recess 72; the first alignment portion 311 of the first bottom plate portion 31 located in the fourth positioning recess 74 is fitted with the second alignment portion 611 of the second bottom plate portion 61 located in the third positioning recess 73. With the above structure, the alignment and matching between the first alignment portion 311 of the first bottom plate portion 31 and the second alignment portion 611 of the second bottom plate portion 61 can also position the first bottom plate portion 31 and the second bottom plate portion 61, so that the positioning between the first bottom plate portion 31 and the second bottom plate portion 61 is more accurate and stable. In addition, since the first through hole 75 is located at the connection position of the first positioning groove 71 and the second positioning groove 72 and penetrates through the retaining frame member 7, and the second through hole 76 is located at the connection position of the third positioning groove 73 and the fourth positioning groove 74, the first through hole 75 and the second through hole 76 can respectively realize the electrical connection between the corresponding first alignment portion 311 and the corresponding second alignment portion 611, thereby realizing the electrical connection of all the positive electrode tabs 200 and the electrical connection of all the negative electrode tabs 300, and further avoiding the occurrence of the virtual welding phenomenon caused by excessive tab layers to the maximum extent.

As a practical matter, one of the first and second alignment portions 311 and 611 may be convex and the other may be concave, the convex edge may be arc-shaped, and the concave edge may be arc-shaped, so that convenience in aligning the first and second alignment portions 311 and 611 may be improved. Due to the existence of the first and second position-limiting portions 78 and 79, the widths of the first and second alignment portions 311 and 611 are smaller than the widths of the first, second, third, and fourth positioning grooves 71, 72, 73, and 74, so that a space for accommodating the first or second position-limiting portion 78 or 79 is provided between the edges of the first and second bottom plate portions 31 and 61.

As a practical matter, as shown in fig. 13, 14, 18 and 19, the cover plate mechanism may include: and a base plate member 8 disposed in stacked relation to the stopper frame member 7. The side of the base member 8 facing the latch frame member 7 has a first boss 81 and a second boss 82, and the side of the base member 8 facing away from the latch frame member 7 has a positive post 83 electrically connected to the first boss 81 and a negative post 84 electrically connected to the second boss 82. The positive post 83 and the negative post 84 are for connection to the outside.

As shown in fig. 25, the first boss 81 is inserted into the first through opening 75, and is laser-welded to the first bottom tab portion 31 of the first connection tab 3 at the positive tab 200 of the first pair of winding core units and the second bottom tab portion 61 of the second connection tab 6 at the positive tab 200 of the second pair of winding core units to form the fifth welding mark 17. The projection of the first boss 81 in the direction perpendicular to the paper surface at least partially overlaps with the corresponding first alignment portion 311 of the first base plate portion 31 and the corresponding second alignment portion 611 of the second connecting piece 6, so that when the fifth solder print 17 is formed, the first boss 81 is electrically connected with the first base plate portion 31 and the second base plate portion 61 respectively, and thus all the positive tabs 200 are electrically connected. In addition, first boss 81 and first bottom plate portion 31, second bottom plate portion 61 has all realized fixed connection each other, first bottom plate portion 31, second bottom plate portion 61 is tight embedding respectively in first positioning groove 71, second positioning groove 72, when the department is buckled to the cover plate mechanism side dorsad in the middle of first monomer core 1 and second monomer core 2, any buckling basically can not take place in the utmost point ear department that first connection piece 3 pressed from both sides and establishes, utmost point ear department between the position that utmost point ear buckled only can be at the first folding piece portion 32 edge of first connection piece 3 and core body 100, consequently can be favorable to the design control of utmost point ear bending more, avoid utmost point ear anti-insertion to roll up core body 100, cause the condemned phenomenon of core short circuit.

As shown in fig. 25, the second boss 82 is inserted into the second through hole 76, and is laser welded to the first bottom tab portion 31 of the first connection tab 3 at the negative electrode tab 300 of the first pair of winding core units and the second bottom tab portion 61 of the second connection tab 6 at the negative electrode tab 300 of the second pair of winding core units to form the sixth weld 18. The projection of the second boss 82 in the direction perpendicular to the paper plane at least partially coincides with the corresponding first alignment portion 311 of the first base plate portion 31 and the second alignment portion 611 of the second connecting piece 6. The advantages of the above structure are similar to those described above and will not be described herein.

As an alternative, as shown in fig. 26, an insulating tape 9 is applied to the side of the fifth solder stamp 17 facing away from the cover plate mechanism. The insulating adhesive tape 9 is applied to the side of the sixth solder stamp 18 facing away from the cover plate mechanism. The welding dust can be prevented from entering the winding core body 100 in the above manner.

As shown in fig. 13 to 19, the stopper frame member 7 may be formed with a plurality of air holes 77. The base plate member 8 has a liquid inlet 85 and an explosion-proof valve mechanism 86, and the positions of the liquid inlet 85 and the explosion-proof valve mechanism 86 correspond to the air hole 77. When the battery is a lithium battery, the electrolyte of the lithium battery can be injected through the injection hole 85 and the air hole 77. When the internal short circuit of the battery occurs, a large amount of gas is rapidly generated, and when a certain pressure is reached, the gas can burst the explosion-proof valve mechanism 86 to release the pressure, so that the explosion of the battery due to the overlarge internal pressure can be avoided.

As shown in fig. 23, 24, 27, 28, and 29, after the first pair of core units and the second pair of core units are stacked in the thickness direction of the first single core 1, the second single core 2, the third single core 4, and the fourth single core 5 are folded back toward the cover mechanism side at the middle between the first single core 1 and the second single core 2, so that the first single core 1, the second single core 2, the third single core 4, and the fourth single core 5 are stacked in the thickness direction. Fixing adhesive tapes 19 for fixing the first single-body roll core 1, the second single-body roll core 2, the third single-body roll core 4 and the fourth single-body roll core 5 are arranged on the other three sides of the stacked single-body roll cores on the side where the cover plate mechanism is removed, so that the first single-body roll core, the second single-body roll core, the third single-body roll core and the fourth single-body roll core are prevented from loosening.

The application also discloses an assembly method of any battery based on multi-winding core parallel connection, and the assembly method can comprise the following steps:

arranging the positive tab 200 of the first single winding core 1 and the positive tab 200 of the second single winding core 2 in parallel, clamping the two tabs between the first bottom tab part 31 and the first folding tab part 32 of one first connecting tab 3, and connecting the first connecting tab 3 with the positive tab 200 of the first single winding core 1 and the positive tab 200 of the second single winding core 2 through welding; the negative electrode tab 300 of the first single winding core 1 and the negative electrode tab 300 of the second single winding core 2 are arranged in parallel and clamped between the first bottom tab portion 31 and the first tab portion 32 of the other first connecting tab 3, and the other first connecting tab 3 is connected with the negative electrode tab 300 of the first single winding core 1 and the negative electrode tab 300 of the second single winding core 2 through welding.

In the above steps, the end faces of the positive tab 200 of the first single winding core 1 and the positive tab 200 of the second single winding core 2 can be aligned with each other and subjected to ultrasonic welding; the end faces of the negative electrode tab 300 of the first single winding core 1 and the negative electrode tab 300 of the second single winding core 2 are aligned with each other and are welded by ultrasonic waves. After the first connecting piece 3 is connected with the positive tab 200 of the first monomer winding core 1 and the positive tab 200 of the second monomer winding core 2, the insulating tape 9 is attached to the side of the first bottom piece portion 32 opposite to the first bottom piece portion 31, and the insulating tape 9 is attached to the side of the first bottom piece portion 31 opposite to the first bottom piece portion 32.

The positive tab 200 of the third single-body winding core 4 and the positive tab 200 of the fourth single-body winding core 5 are arranged in parallel and clamped between the second bottom tab part 61 and the second tab part 62 of one second connecting piece 6, and the second connecting piece 6 is connected with the positive tab 200 of the third single-body winding core 4 and the positive tab 200 of the fourth single-body winding core 5 through welding; the negative electrode tab 300 of the third single winding core 4 and the negative electrode tab 300 of the fourth single winding core 5 are arranged in parallel and clamped between the second bottom tab part 61 and the second tab part 62 of the other second connecting piece 6, and the other second connecting piece 6 is connected with the negative electrode tab 300 of the third single winding core 4 and the negative electrode tab 300 of the fourth single winding core 5 through welding.

In the above steps, the end faces of the positive tab 200 of the third single-body winding core 4 and the positive tab 200 of the fourth single-body winding core 5 can be aligned with each other and subjected to ultrasonic welding; the end faces of the negative electrode tab 300 of the third single roll core 4 and the negative electrode tab 300 of the fourth single roll core 5 are aligned with each other and are welded by ultrasonic waves. After the second connecting piece 6 is connected with the positive tab 200 of the third single winding core 4 and the positive tab 200 of the fourth single winding core 5, the insulating tape 9 is attached to the side of the second bottom piece portion 62 back to the second bottom piece portion 61, and the insulating tape 9 is attached to the side of the second bottom piece portion 61 back to the second bottom piece portion 62.

The two first bottom plate parts 31 are respectively arranged in the first positioning groove 71 and the fourth positioning groove 74 for positioning, the two second bottom plate parts 61 are respectively arranged in the second positioning groove 72 and the third positioning groove 73 for positioning, at this time, the first alignment part 311 of the first bottom plate part 31 positioned in the first positioning groove 71 is matched with the second alignment part 611 of the second bottom plate part 61 positioned in the second positioning groove 72, and the first alignment part 311 of the first bottom plate part 31 positioned in the fourth positioning groove 74 is matched with the second alignment part 611 of the second bottom plate part 61 positioned in the third positioning groove 73; the stop frame member 7, the first pair of core units and the second pair of core units are stacked in order along the thickness direction of the first single core 1.

Inserting the first boss 81 of the substrate member 8 into the first through opening 75, and laser welding the first boss with the first bottom piece portion 31 of the first connecting piece 3 at the positive tab 200 of the first pair of winding core units and the second bottom piece portion 61 of the second connecting piece 6 at the positive tab 200 of the second pair of winding core units; the second boss 82 of the substrate member 8 is inserted into the second through hole 76 and laser-welded to the first bottom piece portion 31 of the first connection piece 3 at the negative electrode tab 300 of the first pair of winding core units and the second bottom piece portion 61 of the second connection piece 6 at the negative electrode tab 300 of the second pair of winding core units.

After laser welding, will first pair roll up the core unit and the second pair roll up the core unit and roll up core 1 and second monomer core 2's centre department and buckle to the cover plate mechanism one side of dorsad, the positive ear 200 and the negative pole ear 300 of first pair roll core unit, the second is to the positive ear 200 and the negative pole ear 300 department bending of rolling up the core unit so that first monomer rolls up core 1, second monomer rolls up core 2, third monomer rolls up core 4 and fourth monomer and rolls up core 5 and pile up along its thickness direction, cover plate mechanism is located first monomer and rolls up core 1, second monomer rolls up core 2, the lateral wall department that core 4 and fourth monomer rolled up core 5 are rolled up to the third monomer.

The battery based on the parallel connection of the multiple winding cores and the assembling method thereof have the following advantages: 1. compared with the traditional four-winding core assembly mode, the invention can avoid the risks of uncontrollable folding and shaping of the tab due to overlong tab and short circuit of the battery cell due to the fact that the end part of the tab is possibly inserted into the winding core body 100 reversely; 2. compared with the traditional butterfly welding assembly mode, the bottom plate part and the folded plate part of the connecting piece are integrated, so that the relative positioning of the bottom plate part and the folded plate part is easier to realize in the welding process, and the risk that the bottom plate part and the folded plate part are excessively deviated in the traditional mode is avoided; 3. compared with the traditional assembly mode, the invention directly positions the bottom plate part on the stop frame member 7 of the cover plate mechanism by utilizing the positioning groove and realizes the welding of the base plate member 8 and the bottom plate part through the through hole, thereby avoiding the risk of poor welding of the bottom plate part; 4. the invention is not only suitable for the parallel assembly of four winding cores, but also suitable for the assembly of batteries with even number of winding cores, such as double winding cores, six winding cores and the like, and can greatly improve the adaptability of the manufacturing process.

All articles and references disclosed, including patent applications and publications, are hereby incorporated by reference for all purposes. The term "consisting essentially of …" describing a combination shall include the identified element, ingredient, component or step as well as other elements, ingredients, components or steps that do not materially affect the basic novel characteristics of the combination. The use of the terms "comprising" or "including" to describe combinations of elements, components, or steps herein also contemplates embodiments that consist essentially of such elements, components, or steps. By using the term "may" herein, it is intended to indicate that any of the described attributes that "may" include are optional. A plurality of elements, components, parts or steps can be provided by a single integrated element, component, part or step. Alternatively, a single integrated element, component, part or step may be divided into separate plural elements, components, parts or steps. The disclosure of "a" or "an" to describe an element, ingredient, component or step is not intended to foreclose other elements, ingredients, components or steps.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.