阅读说明：本技术 一种电池的四极组装配结构 (Four-pole assembling structure of battery ) 是由 刘欢 刘凤龙 于 2021-08-02 设计创作，主要内容包括：本发明公开了一种电池的四极组装配结构,包括第一极组包组合和第二极组包组合；第一极组包组合包括第一极组和第二极组；第一极组上的第一正极耳和第二极组上的第二正极耳,通过正极连接片的一端相连；第一极组上的第一负极耳和第二极组上的第二负极耳,通过负极连接片的一端相连；第二极组包组合包括第三极组和第四极组；第三极组上的第三正极耳和第四极组上的第四正极耳通过正极连接片的另一端相连；第三极组上的第三负极耳和第四极组上的第四负极耳通过负极连接片的另一端相连；正极连接片和负极连接片分别与电池盖上的正极柱和负极柱相连。本发明能够在电池体积增加同时,保证在装配过程中极耳长度不增加,降低因极耳过长而带来的质量问题。(The invention discloses a four-pole assembly structure of a battery, which comprises a first pole group assembly and a second pole group assembly; the first pole group assembly comprises a first pole group and a second pole group; the first positive lug on the first pole group is connected with the second positive lug on the second pole group through one end of a positive connecting sheet; the first negative electrode lug on the first pole group is connected with the second negative electrode lug on the second pole group through one end of a negative electrode connecting sheet; the second pole group combination comprises a third pole group and a fourth pole group; the third positive lug on the third pole group is connected with the fourth positive lug on the fourth pole group through the other end of the positive connecting sheet; the third negative electrode lug on the third pole group is connected with the fourth negative electrode lug on the fourth pole group through the other end of the negative electrode connecting sheet; the positive connecting piece and the negative connecting piece are respectively connected with the positive pole column and the negative pole column on the battery cover. The invention can ensure that the length of the tab is not increased in the assembly process while the volume of the battery is increased, and reduce the quality problem caused by overlong tab.)

1. A four-pole assembly structure of a battery is characterized by comprising a first pole group assembly (8) and a second pole group assembly (9);

wherein the first pole group combination (8) comprises a first pole group (4) and a second pole group (5);

a first positive lug (41) arranged on the first pole group (4) and a second positive lug (51) arranged on the second pole group (5) are connected through one end of a positive connecting sheet (1);

a first negative electrode lug (42) arranged on the first electrode group (4) and a second negative electrode lug (51) arranged on the second electrode group (5) are connected through one end of a negative electrode connecting sheet (2);

wherein the second pole group combination (9) comprises a third pole group (6) and a fourth pole group (7);

a third positive lug (61) arranged on the third pole group (6) and a fourth positive lug (71) arranged on the fourth pole group (7) are connected through the other end of the positive connecting sheet (1);

a third negative electrode lug (62) arranged on the third electrode group (6) and a fourth negative electrode lug (72) arranged on the fourth electrode group (7) are connected through the other end of the negative electrode connecting sheet (2);

the positive connecting piece (1) is connected with a positive post (31) arranged on the battery cover (1);

and the negative electrode connecting piece (1) is connected with a negative electrode column (32) arranged on the battery cover (1).

2. The four-pole assembly structure of a battery according to claim 1, wherein the positive electrode connecting piece (1) includes a positive electrode intermediate connecting piece (10);

wherein, one end of the anode middle connecting block (10) is provided with a first anode welding block (11) and a second anode welding block (12);

a middle gap is longitudinally distributed between the first positive electrode welding block (11) and the second positive electrode welding block (12);

the first positive lug (41) arranged on the first pole group (4) is welded with the first positive welding block (11) on the positive connecting sheet (1);

a second positive lug (51) arranged on the second pole group (5) is welded with a second positive welding block (12) on the positive connecting sheet (1);

wherein the other end of the positive middle connecting block (10) is provided with a third positive welding block (13) and a fourth positive welding block (14);

a middle gap is formed between the third positive electrode welding block (13) and the fourth positive electrode welding block (14) and is distributed longitudinally;

the third positive lug (61) arranged on the third pole group (6) is welded with the third positive welding block (13) on the positive connecting piece (1);

and a fourth positive lug (71) arranged on the fourth pole group (7) and a fourth positive welding block (14) on the positive connecting sheet (1).

3. The four-pole assembly structure of a battery according to claim 2, wherein the positive electrode intermediate connecting block (10) is welded to a positive electrode post (31) provided on the battery cover (1).

4. The four-pole assembly structure of a battery according to claim 2, wherein, for the positive connection piece (1), the junction of the positive middle connection piece (10) and the first positive electrode welding block (11), the second positive electrode welding block (12), the third positive electrode welding block (13) and the fourth positive electrode welding block (14) is provided with a short-circuit protection fusing strip open slot (16).

5. The four-pole assembly structure of a battery according to claim 2, wherein a reinforcing member (15) is provided at the top of the junction of the positive electrode intermediate connecting block (10) with the first positive electrode welded block (11) and the second positive electrode welded block (12), and at the top of the junction with the third positive electrode welded block (13) and the fourth positive electrode welded block (14), respectively.

6. The four-pole assembly structure of a battery according to claim 1, wherein the negative electrode connecting piece (2) includes a negative electrode intermediate connecting piece (20);

wherein, one end of the negative middle connecting block (20) is provided with a first negative welding block (21) and a second negative welding block (22);

a middle gap is formed between the first negative electrode welding block (21) and the second negative electrode welding block (22) and is distributed longitudinally;

the first negative electrode lug (42) arranged on the first electrode group (4) is welded with the first negative electrode welding block (21) on the negative electrode connecting sheet (2);

the second negative electrode lug (51) arranged on the second electrode group (5) is welded with the second negative electrode welding block (22) on the negative electrode connecting sheet (2);

wherein, the other end of the negative middle connecting block (20) is provided with a third negative welding block (23) and a fourth negative welding block (24);

a middle gap is formed between the third negative electrode welding block (23) and the fourth negative electrode welding block (24) and is distributed longitudinally;

the third negative electrode lug (62) arranged on the third electrode group (6) is welded with the third negative electrode welding block (23) on the negative electrode connecting sheet (2);

a fourth negative electrode lug (72) arranged on the fourth electrode group (7) and a fourth negative electrode welding block (24) on the negative electrode connecting sheet (2).

7. The four-pole assembly structure of a battery according to claim 6, wherein the negative electrode intermediate connecting block (20) is welded to a negative electrode post (32) provided on the battery cover (1).

8. The battery quadrupole assembly structure according to claim 1, wherein the positive electrode connecting sheet (1) has a hardness in the range of 5HV to 70 HV;

the hardness range of the negative electrode connecting sheet (2) is 30 HV-100 HV;

the thickness range of the positive connecting piece (1) and the negative connecting piece (2) is 0.1 mm-2 mm.

9. The battery quadrupole assembly structure according to claim 8, wherein the positive electrode connecting sheet (1) has a hardness in the range of 10HV to 30 HV;

the hardness of the negative electrode connecting sheet (2) is in the range of 40HV to 60 HV.

10. The assembled quadrupole structure of a battery according to any one of claims 1 to 9, wherein the first, second, third and fourth pole groups (4, 5, 6, 7) have the same shape and size;

the length ranges of the positive electrode tab and the negative electrode tab of the four are both 10 mm-30 mm.

Technical Field

The invention relates to the technical field of batteries, in particular to a four-pole assembling structure of a battery.

Background

At present, the lithium ion battery has the advantages of high safety, high efficiency, no pollution, high specific energy, more recycling times and the like, and is widely applied to new energy automobiles and energy storage electrode consumer products. At present, the requirements of the whole battery industry on the cost and the quality of the lithium battery are increasingly strict.

The reduction of the ratio of the battery cost to the module cost becomes a primary task, and particularly, the cost per unit of the battery and the cost in the module assembling process can be reduced.

With respect to the cost per unit of battery, this can be achieved by reducing the ratio of the battery structural member cost to the battery cost per unit. The volume of the battery is increased, the utilization rate of the structural part in the battery can be improved, and the unit cost of the battery is reduced. The volume of increase battery, reducible module assembly spare part, when increasing efficiency, also can reduce module raw and other materials cost.

However, as the battery volume increases, new problems arise, which, when the battery volume increases, may result in an excessively long length (e.g., greater than 25mm) of the tab of the electrode assembly if the original technique of assembling the battery with the two-electrode assembly is used. If the tab of the electrode assembly is too long, a series of quality problems (such as undesired problems of folding of the tab, breakage of the tab, etc.) may occur during the production of the battery, thereby causing an increase in the per unit cost of the battery, which is contrary to the original intention of increasing the volume of the battery.

Therefore, there is an urgent need to develop a technology that can ensure that the length of the tab of the battery is not increased during the assembly process while the volume of the battery is increased, so as to reduce a series of quality problems caused by the overlong tab during the assembly process of the battery, and finally achieve the purpose of reducing the cost of the battery.

Disclosure of Invention

The invention aims to provide a quadrupole assembly structure of a battery, aiming at the technical defects in the prior art.

Therefore, the invention provides a four-pole assembly structure of a battery, which comprises a first pole group assembly combination and a second pole group assembly combination;

the first pole group assembly comprises a first pole group and a second pole group;

a first positive lug arranged on the first pole group and a second positive lug arranged on the second pole group are connected through one end of a positive connecting sheet;

a first negative electrode lug arranged on the first electrode group and a second negative electrode lug arranged on the second electrode group are connected through one end of a negative electrode connecting sheet;

the second pole group combination comprises a third pole group and a fourth pole group;

the third positive lug arranged on the third pole group and the fourth positive lug arranged on the fourth pole group are connected through the other end of the positive connecting sheet;

the third negative electrode lug arranged on the third electrode group and the fourth negative electrode lug arranged on the fourth electrode group are connected through the other end of the negative electrode connecting sheet;

the positive connecting sheet is connected with a positive post arranged on the battery cover;

and the negative electrode connecting sheet is connected with a negative electrode column arranged on the battery cover.

Preferably, the positive connecting piece comprises a positive middle connecting block;

one end of the positive middle connecting block is provided with a first positive welding block and a second positive welding block;

a middle gap is longitudinally distributed between the first positive electrode welding block and the second positive electrode welding block;

the first positive lug arranged on the first pole group is welded with the first positive welding block on the positive connecting piece;

the second anode lug arranged on the second electrode group is welded with the second anode welding block on the anode connecting sheet;

the other end of the positive electrode middle connecting block is provided with a third positive electrode welding block and a fourth positive electrode welding block;

a middle gap is longitudinally distributed between the third positive electrode welding block and the fourth positive electrode welding block;

the third anode lug arranged on the third electrode group is welded with the third anode welding block on the anode connecting sheet;

and a fourth positive lug arranged on the fourth pole group and a fourth positive welding block on the positive connecting sheet.

Preferably, the positive middle connecting block is welded with a positive post arranged on the battery cover.

Preferably, for the positive connecting sheet, the joints of the positive middle connecting block on the positive connecting sheet and the first positive welding block, the second positive welding block, the third positive welding block and the fourth positive welding block are provided with short-circuit protection fusing strip open grooves.

Preferably, the top of the joint of the positive middle connecting block and the first positive welding block and the second positive welding block, and the top of the joint of the third positive welding block and the fourth positive welding block are respectively provided with a reinforcing piece.

Preferably, the negative connecting sheet comprises a negative middle connecting block;

one end of the negative electrode middle connecting block is provided with a first negative electrode welding block and a second negative electrode welding block;

a middle gap is longitudinally distributed between the first negative electrode welding block and the second negative electrode welding block;

the first negative electrode lug arranged on the first electrode group is welded with the first negative electrode welding block on the negative electrode connecting sheet;

the second negative electrode lug arranged on the second electrode group is welded with the second negative electrode welding block on the negative electrode connecting sheet;

the other end of the negative electrode middle connecting block is provided with a third negative electrode welding block and a fourth negative electrode welding block;

a middle gap is longitudinally distributed between the third negative electrode welding block and the fourth negative electrode welding block;

the third negative electrode lug arranged on the third electrode group is welded with the third negative electrode welding block on the negative electrode connecting sheet;

and a fourth negative electrode lug arranged on the fourth electrode group and a fourth negative electrode welding block on the negative electrode connecting sheet.

Preferably, the negative pole middle connecting block is welded with a negative pole column arranged on the battery cover.

Preferably, the positive electrode connecting sheet 1 has a hardness in the range of 5HV to 70 HV;

the hardness range of the negative electrode connecting sheet 2 is 30 HV-100 HV;

the thickness range of the positive connecting piece 1 and the negative connecting piece 2 is 0.1 mm-2 mm.

Preferably, the positive electrode connecting sheet 1 has a hardness in the range of 10HV to 30 HV;

the hardness of the negative electrode connecting piece 2 is in the range of 40 to 60 HV.

Preferably, the first, second, third and fourth pole groups 4, 5, 6, 7 are the same in shape and size;

the length ranges of the positive electrode tab and the negative electrode tab of the four are both 10 mm-30 mm.

Compared with the prior art, the technical scheme provided by the invention has the advantages that the four-pole assembly structure of the battery is scientific in structural design, the length of the lug of the battery is ensured not to be increased in the assembly process while the volume of the battery is increased, a series of quality problems (such as poor problems of lug folding, lug breakage and the like) caused by overlong lug in the assembly process of the battery are reduced, the purpose of reducing the cost of the battery is finally achieved, and the four-pole assembly structure has great production practice significance.

According to the invention, the adopted tab is shorter and smaller in length, so that the space utilization rate in the battery can be increased.

Drawings

Fig. 1 is a schematic structural view of a positive electrode connecting sheet in a quadrupole assembly structure of a battery according to the present invention;

FIG. 2 is a schematic structural view of a negative connecting tab in a four-pole assembly structure of a battery according to the present invention;

FIG. 3 is a schematic diagram illustrating the fusing of the positive connection tab in the four-pole assembly structure of the battery according to the present invention;

fig. 4 is a schematic diagram of relative positions of a first electrode group and a second electrode group B in the first sub-electrode group, and a positive connecting sheet and a negative connecting sheet during welding in the four-electrode assembly structure of the battery provided by the invention;

fig. 5 is a schematic structural diagram of a first pole group assembly in a four-pole assembly structure of a battery according to the present invention;

fig. 6 is a schematic diagram of relative positions of a first pole group assembly and a second pole group assembly during welding in a four-pole assembly structure of a battery according to the present invention;

fig. 7 is a schematic view of a connection structure of a first pole group assembly and a second pole group assembly in a four-pole assembly structure of a battery according to the present invention;

fig. 8 is a schematic diagram of relative positions of a first pole group assembly and a second pole group assembly with respect to a battery cover during welding in a four-pole assembly structure of a battery according to the present invention;

fig. 9 is a schematic structural state diagram of a quadrupole assembly structure of a battery finally obtained after bending the positive connecting sheet and the negative connecting sheet;

in the figure, 1-positive electrode tab;

11-a first positive electrode solder bump; 12-a second positive electrode welding block, 13-a third positive electrode welding block and 14-a fourth positive electrode welding block;

15-reinforcement, 16-short protection fuse strip open slot 16;

2-negative pole connecting piece;

21-a first negative electrode solder bump; 22-a second negative electrode solder bump, 23-a third negative electrode solder bump, 24-a fourth negative electrode solder bump;

3-cell cover, 31-positive pole, 32-negative pole;

4-a first pole group, 5-a second pole group; 6-third pole group, 7-fourth pole group;

8-a first pole group package combination, 9-a second pole group package combination, and 10-a whole battery pole group package.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 to 9, the present invention provides a four-pole assembly structure of a battery, including a first pole group assembly 8 and a second pole group assembly 9;

the first pole group assembly 8 comprises a first pole group 4 and a second pole group 5;

a first positive lug 41 arranged on the first pole group 4 and a second positive lug 51 arranged on the second pole group 5 are connected through one end of a positive connecting sheet 1;

the first negative electrode tab 42 arranged on the first electrode group 4 is connected with the second negative electrode tab 51 arranged on the second electrode group 5 through one end of a negative electrode connecting sheet 2;

the second pole group combination 9 comprises a third pole group 6 and a fourth pole group 7;

the third positive lug 61 arranged on the third pole group 6 and the fourth positive lug 71 arranged on the fourth pole group 7 are connected through the other end of the positive connecting sheet 1;

the third negative electrode tab 62 arranged on the third pole group 6 and the fourth negative electrode tab 72 arranged on the fourth pole group 7 are connected through the other end of the negative electrode connecting sheet 2;

wherein, the positive connecting sheet 1 is connected (specifically welded) with a positive post 31 arranged on the battery cover 1;

the negative electrode connecting sheet 1 is connected (specifically, welded) to a negative electrode post 32 provided on the battery cover 1.

In the invention, in particular, the positive connecting sheet 1 comprises a positive middle connecting block 10;

a first positive electrode welding block 11 and a second positive electrode welding block 12 are arranged at one end of the positive electrode middle connecting block 10;

a longitudinally distributed (i.e. front-to-back distributed) middle gap is arranged between the first positive electrode welding block 11 and the second positive electrode welding block 12;

wherein, the first anode tab 41 arranged on the first electrode group 4 is welded with the first anode welding block 11 on the anode connecting sheet 1;

the second positive lug 51 arranged on the second pole group 5 is welded with the second positive welding block 12 on the positive connecting sheet 1;

in concrete implementation, the positive middle connecting block 10 is connected (specifically welded) with a positive post 31 arranged on the battery cover 1.

In particular, a third positive electrode welding block 13 and a fourth positive electrode welding block 14 are arranged at the other end of the positive electrode middle connecting block 10;

a longitudinally distributed (i.e., front-to-back distributed) middle gap is formed between the third positive electrode welding block 13 and the fourth positive electrode welding block 14;

the third anode lug 61 arranged on the third electrode group 6 is welded with the third anode welding block 13 on the anode connecting sheet 1;

the fourth positive tab 71 of the fourth group 7 is connected to the fourth positive electrode solder bump 14 of the positive electrode connecting piece 1.

In the invention, in a concrete implementation, the negative connecting piece 2 comprises a negative middle connecting block 20;

one end of the negative middle connecting block 20 is provided with a first negative welding block 21 and a second negative welding block 22;

a longitudinally distributed (i.e., front-to-back) intermediate space is formed between the first negative electrode weld block 21 and the second negative electrode weld block 22;

wherein, the first negative tab 42 arranged on the first pole group 4 is welded with the first negative welding block 21 on the negative connecting piece 2;

the second negative electrode tab 51 arranged on the second electrode group 5 is welded with the second negative electrode welding block 22 on the negative electrode connecting sheet 2;

in concrete implementation, the negative middle connecting block 20 is connected (specifically welded) to a negative pole column 32 provided on the battery cover 1.

In particular, a third negative electrode welding block 23 and a fourth negative electrode welding block 24 are arranged at the other end of the negative electrode middle connecting block 20;

a longitudinally distributed (i.e., front-to-back) intermediate space is formed between the third negative electrode lead block 23 and the fourth negative electrode lead block 24;

the third negative tab 62 arranged on the third pole group 6 is welded with the third negative welding block 23 on the negative connecting piece 2;

fourth negative tab 72 provided on fourth electrode group 7 and fourth negative electrode tab 24 provided on negative electrode connecting piece 2.

In the present invention, referring to fig. 3, for the positive connection sheet 1, a short-circuit protection fusing strip opening slot 16 is provided at the connection between the positive middle connection block 10 and the first positive welding block 11, the second positive welding block 12, the third positive welding block 13 and the fourth positive welding block 14.

In a specific implementation, referring to fig. 1, a reinforcing member 15 is respectively disposed at the top of the joint of the positive middle connecting block 10 and the first positive welding block 11 and the second positive welding block 12, and at the top of the joint of the third positive welding block 13 and the fourth positive welding block 14.

Referring to fig. 3, in order to perform protection fusing when a short circuit occurs, the fusing cross-sectional area of the short-circuit protection fusing strip open slot 16 can be designed according to the designed short-circuit current of the battery, so that the connection point of the positive middle connecting block 10 and the positive welding block is fused within an allowable time by a specified current, and the inside of the battery achieves the purpose of open circuit, thereby playing a role of safety protection;

specifically, the positive electrode connecting sheet 1 has a hardness in the range of 5HV to 70HV (vickers hardness), and further 10HV to 50HV, preferably 10HV to 30 HV.

In the concrete implementation, the material of reinforcement 15 is preferably PP (polypropylene), and when the PP material is strengthened, and the positive connection piece is after fusing, and the joint strength of reinforcement 15 is still not enough, can select the harder plastics after the shaping such as PPs, PA, ABS, further strengthen the intensity of reinforcement 15.

In particular, the reinforcing part 15 is preferably integrally injection-molded with the positive connecting sheet 1;

in the present invention, specifically, the hardness of the negative electrode connecting sheet 2 is in the range of 30HV to 100HV, and further 40HV to 80HV, preferably 40HV to 60 HV;

in the invention, in a concrete implementation, the thickness range of the positive connecting piece 1 and the negative connecting piece 2 is 0.1 mm-2 mm, or 0.02 mm-2 mm, and when the thickness of the positive connecting piece 1 and the negative connecting piece 2 is more than 0.5mm, a single metal sheet or a multi-layer metal sheet welding mode can be selected.

In the invention, in particular, for the positive connecting sheet 1 and the negative connecting sheet 2, the width and the thickness of each welding block arranged on the positive connecting sheet and the negative connecting sheet are designed according to the requirement of the overcurrent capacity of the battery.

In the present invention, in particular, the first, second, third and fourth pole groups 4, 5, 6 and 7 have the same shape and size;

the length ranges of the positive electrode tab and the negative electrode tab of the four are 10mm to 30mm, and further 15mm to 25mm, preferably 20 mm.

In the present invention, as shown in fig. 4, the first and second pole groups 4 and 5 are relative position diagrams when welded to one end of the positive electrode connecting piece and one end of the negative electrode connecting piece;

before the first pole group 4 and the second pole group 5 are welded as shown in fig. 4, the positive electrode tabs and the negative electrode tabs on the first pole group 4 and the second pole group 5 need to be pre-welded (i.e. the tabs are welded to the pole groups);

after pre-welding, placing the positive connecting piece 1, the negative connecting piece 2, the first pole group 4 and the second pole group 5 in a special jig according to the relative positions shown in the figure 4, welding a first positive electrode welding block 11 on the positive connecting piece 1 with a first positive electrode lug 41 of the first pole group 4, and welding a second positive electrode welding block 12 of the positive connecting piece 1 with a second positive electrode lug 51 of the second pole group 5;

meanwhile, the first negative electrode welding block 21 of the negative electrode connecting piece 2 is welded with the first negative electrode tab 42 of the first pole group 4, the negative electrode is connected, and the second negative electrode welding block 22 of the negative electrode connecting piece 2 is welded with the second negative electrode tab 52 of the second pole group 5.

In the present invention, in a concrete implementation, with respect to the present invention, after the first pole group 4 and the second pole group 5 are welded according to the state of fig. 4, the positions of the first pole group 4 and the second pole group 5 are folded from opposite (left-right symmetrical state) to be downward, and the two are folded to be in a state of being overlapped and parallel up and down, so that the combined state of the first pole group assembly 8 can be obtained. The first pole group assembly 8 is after horizontal rotation as shown in figure 5.

That is, with the present invention, the first pole group 4 and the second pole group 5 are welded to the left side welding area (including the first positive electrode welding block and the second positive electrode welding block) of the positive electrode connecting piece 1 and the left side welding area (including the first negative electrode welding block and the second negative electrode welding block) of the negative electrode connecting piece 2, and after welding, the positions of the first pole group 4 and the second pole group 5 are changed from being opposite to being parallel to form the first pole group combination 8;

in the present invention, referring to fig. 6, the third pole group 6 and the fourth pole group 7 included in the second pole group assembly 9 are shown, and the relative positions of the first pole group 4 and the second pole group 5 included in the first pole group assembly 8 are shown during welding. The relative position is determined by a first included angle between a left-side welding area (comprising a first anode welding block and a second anode welding block) and a right-side welding area (comprising a third anode welding block and a fourth anode welding block) of the anode connecting sheet 1, and a second included angle between the left-side welding area (comprising a first cathode welding block and a second cathode welding block) and the right-side welding area (comprising a third cathode welding block and a fourth cathode welding block) of the cathode connecting sheet 2;

it should be noted that the first included angle is an included angle between the left-side welding area and the right-side welding area of the positive electrode connecting sheet 1 in an initial state, and is an included angle when bending operation is not performed. The second included angle is an included angle between the left side welding area and the right side welding area of the negative electrode connecting sheet 2 in an initial state, and is an included angle when bending operation is not performed.

When the first angle and the second angle are both 90 °, the first pole group assembly 8 (including the first pole group 4 and the second pole group 5) can be directly placed on the fourth pole group 7 in the second pole group assembly 9.

In particular, the angle between the first included angle and the second included angle is 0-135 degrees, and preferably 90 degrees.

In specific implementation, the third pole group 6 and the fourth pole group 7 in the second pole group combination 9 also need to be pre-welded to the positive electrode tab and the negative electrode tab of the third pole group 6 and the fourth pole group 7 before welding as shown in fig. 6, and if the first pole group combination 8 (including the first pole group 4 and the second pole group 5) at other angles is selected, a special jig needs to be used for fixing.

Referring to fig. 6, for the third pole group 6 and the fourth pole group 7 included in the second pole group combination 9, the positive tab and the negative tab of the third pole group 6 and the fourth pole group 7 need to be pre-welded before the welding in fig. 6 is performed on the third pole group 6 and the fourth pole group 7, and after the pre-welding, the positive tab 1 connected to the second pole group combination 9, the right-side welding zone of the positive tab 1 (including the third positive welding block 13 and the fourth positive welding block 14) is respectively welded with the third positive tab of the third pole group 6 and the fourth positive tab of the fourth pole group 7;

the negative electrode connecting piece 2 connected with the second electrode group combination 9, and a right welding area (comprising a third negative electrode welding block 231 and a fourth negative electrode welding block 24) of the negative electrode connecting piece 2 are respectively welded with a third negative electrode lug of the third electrode group 6 and a fourth negative electrode lug of the fourth electrode group 7;

in the present invention, referring to fig. 7, after the third pole group 6 and the fourth pole group 7 are welded in the state of fig. 6, the positions of the third pole group 6 and the fourth pole group 7 are folded downward and relatively from the relative positions, so as to form a combined state of the second pole group combination 9, as shown in fig. 7.

That is, according to the present invention, the positive electrode tab 1 connected to the first electrode group assembly 8 is welded to the right side welding area of the positive electrode tab 1, and the third positive electrode tab of the third electrode group 6 and the fourth positive electrode tab of the fourth electrode group 7 in the second electrode group assembly 9; the right welding area of the negative electrode connecting sheet 2 connected with the first electrode group combination 8 is welded with the third negative electrode ear of the third electrode group 6 and the fourth negative electrode ear of the fourth electrode group 7 in the second electrode group combination 9, and after welding, the positions of the third electrode group 6 and the fourth electrode group 7 are changed from opposite arrangement to parallel arrangement, so that the combination state of the second electrode group combination 9 is formed;

it should be noted that, for the present invention, the third pole group 6 and the fourth pole group 7 included in the second pole group combination 9 have soft positive and negative pole ears, and the positions thereof can be changed by a small margin.

The third pole group 6 and the fourth pole group 7 which are positioned on the left and included by the second pole group combination 9 and the first pole group 4 and the second pole group 5 which are positioned on the right and included by the first pole group combination 8 have a certain angle (defined as a third included angle) with each other, the angle of the third pole group is close to the included angle (including the first included angle and the second included angle) formed by the left welding area and the right welding area of the positive connecting piece and the negative connecting piece, and the preferred included angles of the first included angle, the second included angle and the third included angle are the same.

In the present invention, for the second pole group assembly 9 and the first pole group assembly 8, as shown in fig. 8, the positive pole 31 of the battery cover 3 can be welded to the positive connection sheet 1; welding the negative pole column 32 of the battery cover 3 with the negative pole connecting piece 2; the welding track can be in a strip shape or a circular shape; and the size of the welding track is designed according to the overcurrent size of the battery core.

In the present invention, referring to fig. 9, after the positive connection plate 1 and the negative connection plate 2 of the second pole group assembly 9 and the first pole group assembly 8 are welded to the positive post 31 and the negative post 32 of the battery cover 3, respectively, as shown in fig. 8, the positive connection plate 1 and the negative connection plate 2 can be bent continuously, and the shape structure obtained is as shown in fig. 9.

In particular, the product structure shown in fig. 8 can be placed into a jig for bending the positive electrode connecting sheet and the negative electrode connecting sheet, so that the angles of the third electrode group 6 and the fourth electrode group 7 and the left welding area of the positive electrode connecting sheet 1 and the left welding area of the negative electrode connecting sheet are synchronously changed during bending, and the bending is stopped when the product structure is bent to the position shown in fig. 9; at the same time, the first pole group 4 and the second pole group 5 change angles in synchronization with the right-side weld area of the positive connection piece and the right-side weld area of the negative connection piece, and are bent to the positions shown in fig. 9 to stop, and finally the whole battery pole group assembly 10 is obtained.

That is, with the present invention, the positive electrode tab is welded to the positive electrode post of the battery cover, and the negative electrode tab is welded to the negative electrode post of the battery cover. After welding, bending the left welding area of the positive and negative connecting sheets to be parallel to the battery cover; meanwhile, the right side welding area of the bent positive and negative electrode connecting sheets is parallel to the battery cover, and finally the whole battery electrode group package 10 is obtained.

Based on the technical scheme design, the four-pole assembly structure of the battery can solve the quality problem of the battery in the assembly process due to the fact that the anode lug and the cathode lug of the pole group are too long when the width of the battery is increased in the existing two-pole battery, meanwhile, the four-pole assembly structure of the battery also reduces the occupation of the inner space of the battery by the lugs, increases the utilization rate of the inner space of the battery, and reduces the production cost of the battery while improving the product qualification rate.

In summary, compared with the prior art, the four-pole assembly structure of the battery provided by the invention has scientific structural design, and can ensure that the length of the tab of the battery is not increased in the assembly process while the volume of the battery is increased, so that a series of quality problems (such as poor problems of tab folding, tab fracture and the like) caused by overlong tab in the assembly process of the battery are reduced, the purpose of reducing the cost of the battery is finally achieved, and the four-pole assembly structure of the battery has great production practice significance.

According to the invention, the adopted tab is shorter and smaller in length, so that the space utilization rate in the battery can be increased.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.