阅读说明：本技术 电池 (Battery with a battery cell ) 是由 章辉 彭宁 于 2021-08-24 设计创作，主要内容包括：本申请提供一种电池。本申请提供的电池包括卷芯和电池包装组件；卷芯包括至少两个极性相反的极片,至少两个极片上分别形成第一极耳和第二极耳,卷芯具有叠设区域,位于叠设区域内的至少两个极片相互叠设；电池包装组件包括第一壳体、第二壳体和绝缘密封件,第一壳体与第二壳体互相扣合形成一空腔,卷芯位于空腔内；第一壳体具有连接第一极耳的第一焊接区域,第二壳体具有连接第二极耳的第二焊接区域；第一壳体包括第一底壁和设置在第一底壁周围的第一侧壁,第二壳体包括第二底壁和设置在第二底壁周围的第二侧壁；位于叠设区域内的极片与第一底壁和/或第一侧壁平行。本申请的电池的制造成本较小。(The present application provides a battery. The battery provided by the application comprises a winding core and a battery packaging assembly; the winding core comprises at least two pole pieces with opposite polarities, a first pole lug and a second pole lug are respectively formed on the at least two pole pieces, the winding core is provided with a stacking area, and the at least two pole pieces in the stacking area are stacked mutually; the battery packaging assembly comprises a first shell, a second shell and an insulating sealing element, wherein the first shell and the second shell are mutually buckled to form a cavity, and the winding core is positioned in the cavity; the first shell is provided with a first welding area connected with the first pole lug, and the second shell is provided with a second welding area connected with the second pole lug; the first housing includes a first bottom wall and a first side wall disposed around the first bottom wall, and the second housing includes a second bottom wall and a second side wall disposed around the second bottom wall; the pole piece in the overlapping area is parallel to the first bottom wall and/or the first side wall. The battery of the present application is less costly to manufacture.)

1. A battery is characterized by comprising a winding core and a battery packaging component;

the winding core comprises at least two pole pieces with opposite polarities, a first pole lug and a second pole lug are respectively formed on the at least two pole pieces, the winding core is provided with a stacking area, and the at least two pole pieces in the stacking area are stacked mutually;

the battery packaging assembly comprises a first shell, a second shell and an insulating sealing element, wherein the first shell and the second shell are mutually buckled to form a cavity, and the winding core is positioned in the cavity; the first shell is provided with a first welding area for connecting the first pole lug, and the second shell is provided with a second welding area for connecting the second pole lug;

the first shell comprises a first bottom wall and a first side wall arranged around the first bottom wall, the second shell comprises a second bottom wall and a second side wall arranged around the second bottom wall, the first bottom wall and the second bottom wall are oppositely arranged in the thickness direction of the battery packaging assembly, the first bottom wall is parallel to the second bottom wall, one of the first side wall and the second side wall surrounds the other, the insulating sealing member is clamped between the first side wall and the second side wall, and the extension lengths of the first side wall and the second side wall in the thickness direction of the battery packaging assembly are unequal;

the pole piece located in the overlapping area is parallel to the first bottom wall and/or the first side wall.

2. The battery of claim 1, further comprising a reinforcement disposed outside the first sidewall, the reinforcement disposed in correspondence with the first weld region;

or, the reinforcing piece is arranged on the outer side of the second side wall, and the reinforcing piece and the second welding area are correspondingly arranged.

3. The battery of claim 2, wherein the reinforcement and the insulating seal have a space therebetween in a thickness direction of the battery packaging assembly; the spacing is greater than 0.5 mm.

4. The cell defined in any one of claims 1-3, wherein the first side wall has a thickness that is greater than 1.5 times the thickness of the first base wall, and the second side wall has a thickness that is greater than 1.5 times the thickness of the second base wall.

5. The battery according to claim 2 or 3, wherein the reinforcement is provided on one of the first and second side walls having a large extension length in a thickness direction of the battery pack assembly.

6. The cell defined in any one of claims 1-3, wherein the insulating seal is connected to the first side wall or the second side wall and the insulating seal circumferentially surrounds the first side wall or the second side wall.

7. The cell defined in any one of claims 1-3, wherein there are two insulating seals, one insulating seal being connected to one of the first and second side walls and the other insulating seal being connected to the other of the first and second side walls; and one insulating seal abuts and surrounds the other insulating seal.

8. The battery according to any one of claims 1 to 3, wherein the insulating seal member has a tackiness, and/or the insulating seal member has an elasticity; when the insulating seal has a tackiness or the seal is an elastic member having a tackiness, the insulating seal is fused to one of the first side wall and the second side wall and adheres to the other of the first side wall and the second side wall;

when the insulating sealing element has elasticity, the insulating sealing element is pressed on one of the first side wall and the second side wall, and the other of the first side wall and the second side wall is pressed with the insulating sealing element.

9. The battery according to any one of claims 1 to 3, wherein the first case or the second case is provided with an explosion-proof groove;

when the explosion-proof groove is formed in the first shell, the extension length of the first side wall is smaller than that of the second side wall;

when the explosion-proof groove is formed in the second shell, the extension length of the second side wall is smaller than that of the first side wall.

10. The battery according to any one of claims 1 to 3, further comprising an insulating member provided between the winding core and the first case or the second case, the insulating member being for insulating and connecting the winding core and one of the first side wall and the second side wall having a small extension in the thickness direction of the battery packaging assembly.

Technical Field

The application relates to the technical field of batteries, in particular to a battery.

Background

A battery refers to a device that can convert chemical energy into electrical energy in a cup, tank, or other container or composite container containing an electrolyte solution and metal electrodes to generate an electric current, and generally includes a roll core and an aluminum-plastic film or casing that encases the roll core.

The existing shell is generally a steel shell and comprises a first shell and a second shell, the first shell and the second shell are welded in a laser welding mode, a winding core comprises a positive tab and a negative tab, the positive tab is welded to one of the first shell and the second shell, and the negative tab is welded to the other of the first shell and the second shell.

However, the manufacturing cost of the case welded by the laser welding is high.

Disclosure of Invention

The present application provides a battery, the manufacturing cost of which is small.

The application provides a battery, which comprises a winding core and a battery packaging assembly; the winding core comprises at least two pole pieces with opposite polarities, a first pole lug and a second pole lug are respectively formed on the at least two pole pieces, the winding core is provided with a stacking area, and the at least two pole pieces in the stacking area are stacked mutually; the battery packaging assembly comprises a first shell, a second shell and an insulating sealing element, wherein the first shell and the second shell are mutually buckled to form a cavity, and the winding core is positioned in the cavity; the first shell is provided with a first welding area connected with the first pole lug, and the second shell is provided with a second welding area connected with the second pole lug; the first shell comprises a first bottom wall and a first side wall arranged around the first bottom wall, the second shell comprises a second bottom wall and a second side wall arranged around the second bottom wall, the first bottom wall and the second bottom wall are oppositely arranged in the thickness direction of the battery packaging assembly, the first bottom wall is parallel to the second bottom wall, one of the first side wall and the second side wall surrounds the other, the insulating sealing element is clamped between the first side wall and the second side wall, and the extension lengths of the first side wall and the second side wall in the thickness direction of the battery packaging assembly are not equal; the pole piece in the overlapping area is parallel to the first bottom wall and/or the first side wall.

The battery provided by the application comprises a winding core and a battery packaging assembly; the winding core comprises at least two pole pieces with opposite polarities, a first pole lug and a second pole lug are respectively formed on the at least two pole pieces, the winding core is provided with a stacking area, and the at least two pole pieces in the stacking area are stacked mutually; the battery packaging assembly comprises a first shell, a second shell and an insulating sealing element, wherein the first shell and the second shell are mutually buckled to form a cavity, and the winding core is positioned in the cavity; the first shell is provided with a first welding area connected with the first pole lug, and the second shell is provided with a second welding area connected with the second pole lug; the first shell comprises a first bottom wall and a first side wall arranged around the first bottom wall, the second shell comprises a second bottom wall and a second side wall arranged around the second bottom wall, the first bottom wall and the second bottom wall are oppositely arranged in the thickness direction of the battery packaging assembly, the first bottom wall is parallel to the second bottom wall, one of the first side wall and the second side wall surrounds the other, the insulating sealing element is clamped between the first side wall and the second side wall, and the extension lengths of the first side wall and the second side wall in the thickness direction of the battery packaging assembly are not equal; the pole piece in the overlapping area is parallel to the first bottom wall and/or the first side wall. The battery of the present application is less costly to manufacture.

The construction of the present application and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1a is a schematic perspective view of a battery according to an embodiment of the present disclosure;

FIG. 1b is a schematic plan view of FIG. 1 a;

FIG. 1c is a cross-sectional view taken along A-A of FIG. 1 b;

FIG. 1d is an enlarged view of a portion of the structure at B in FIG. 1 c;

fig. 2a is a schematic perspective view of a battery according to an embodiment of the present disclosure;

FIG. 2b is a schematic plan view of FIG. 2 a;

FIG. 2C is a cross-sectional view taken along line C-C of FIG. 2 b;

FIG. 2D is an enlarged view of a portion of the structure at D of FIG. 2 c;

FIG. 3a is a schematic view of the insulating sealing member corresponding to FIG. 1a connected to the first housing;

FIG. 3b is a schematic plan view of FIG. 3 a;

FIG. 3c is a cross-sectional view taken along direction E-E of FIG. 3 b;

FIG. 3d is an enlarged view of a portion of the structure at F in FIG. 3 c;

FIG. 4a is a schematic view of the connection state of the insulating sealing member and the second housing corresponding to FIG. 1 a;

FIG. 4b is a schematic plan view of FIG. 4 a;

FIG. 4c is a cross-sectional view taken along the line G-G of FIG. 4 b;

FIG. 4d is an enlarged view of a portion of the structure at H in FIG. 4 c;

FIG. 5a is a schematic view of the insulating sealing member corresponding to FIG. 2a being connected to the first housing;

FIG. 5b is a schematic plan view of FIG. 5 a;

FIG. 5c is a cross-sectional view taken along line I-I of FIG. 5 b;

FIG. 5d is an enlarged view of a portion of the structure at J in FIG. 5 c;

FIG. 6a is a schematic view of the insulating sealing member of FIG. 2a connected to the second housing;

FIG. 6b is a schematic plan view of FIG. 6 a;

FIG. 6c is a cross-sectional view taken along line K-K of FIG. 6 b;

fig. 6d is an enlarged view of a portion of the structure at L in fig. 6 c.

Description of reference numerals:

1-a winding core; 2-a battery packaging assembly; 3-a reinforcement; 4-an explosion-proof groove; 5-liquid injection hole;

10-a battery; 21-a first housing; 22-a second housing; 23-a cavity; 24-an insulating seal; 41-a first groove section; 42-a second groove section;

211 — a first cavity; 221-a second cavity;

2111-a first side wall; 2112-first bottom wall; 2211-a second sidewall; 2212-second bottom wall.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all 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 application. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It should be noted that, in the description of the present application, the terms "first" and "second" are used merely for convenience in describing different components, and are not to be construed as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

The battery generally comprises a winding core and an aluminum-plastic film or a steel shell coated outside the winding core, and the traditional aluminum-plastic film has lower strength, poorer pressure resistance and easy breakage and leakage, so that the battery has higher potential safety hazard; in the battery with the steel shell structure, the steel shell comprises a positive shell and a negative shell, one of the positive shell and the negative shell is provided with a flange, and the other of the positive shell and the negative shell is welded on the flange to realize the connection of the positive shell and the negative shell, wherein the welding mode is laser welding, so the manufacturing cost of the steel shell is high; in addition, in the process of welding and connecting the anode shell and the cathode shell, the requirement on welding parameters is high, and the defective rate of the steel shell can be improved.

Therefore, the battery is characterized in that the winding core inside the battery is packaged by the packaging component consisting of the first shell, the insulating sealing element and the second shell, wherein the insulating sealing element is used for hermetically connecting the first shell and the second shell, and therefore the battery packaging component has higher strength and stronger pressure resistance compared with the existing aluminum-plastic film and can improve the safety of the battery; and for current steel-clad construction, the battery packaging subassembly of this application only sets up insulating seal between first casing and second casing, can realize the sealing connection of first casing and second casing, compares in current laser welding mode, and the manufacturing cost of the battery packaging subassembly in the battery of this application is littleer.

The present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1a is a schematic perspective view of a battery according to an embodiment of the present disclosure. FIG. 1b is a schematic plan view of FIG. 1 a. FIG. 1c is a cross-sectional view taken along A-A of FIG. 1 c. FIG. 1d is an enlarged view of a portion of the structure at B in FIG. 1 c. Fig. 2a is a schematic perspective view of a battery according to an embodiment of the present disclosure. Fig. 2b is a schematic plan view of fig. 2 a. Fig. 2C is a cross-sectional view of fig. 2b in the direction C-C. Fig. 2D is an enlarged view of a portion of the structure at D in fig. 2 c.

As shown in fig. 1a to 2d, the present embodiment provides a battery 10 including a jelly roll 1 and a battery pack assembly 2.

Specifically, the winding core 1 includes a positive plate (not shown in the figure) and a negative plate (not shown in the figure), the positive plate is welded with a positive tab (not shown in the figure), the negative plate is welded with a negative tab (not shown in the figure), the winding core 1 has a stacking area (not shown in the figure), and the positive plate and the negative plate located in the stacking area are stacked with each other; the reeling core 1 should also comprise structures such as a separator, and the other structures comprised by the reeling core will not be described in detail here.

Further, the battery pack assembly 2 includes a first case 21 and a second case 22, the first case 21 and the second case 22 are fastened to each other to form a cavity 23, and the winding core 1 is disposed in the cavity 23, wherein both the first case 21 and the second case 22 may be made of stainless steel or nickel, and in some other embodiments, both the first case 21 and the second case 22 may be made of other metal materials, and the types of the other metal materials are not particularly limited.

As shown in fig. 1a to 2d, first housing 21 includes first cavity 211 having an opening, second housing 22 includes second cavity 221 having an opening, the opening of first cavity 211 and the opening of second cavity 221 are disposed opposite to each other, so that first cavity 211 and second cavity 221 jointly form cavity 23, wherein first cavity 211 and first housing 21 are matched in shape, second cavity 221 and second housing 22 are matched in shape, and the opening of first cavity 211 and the opening of second cavity 221 are both rectangular, in some other embodiments, the opening of first cavity 211, the opening of second cavity 221, the shape of first housing 21, and the shape of second housing 22 may be other types of shapes.

Specifically, the first cavity 211 has a first side wall 2111 and a first bottom wall 2112, the second cavity 221 has a second side wall 2211 and a second bottom wall 2212, the first bottom wall 2112 and the second bottom wall 2212 are arranged oppositely in the thickness direction of the battery packaging component 2, the first bottom wall 2112 and the second bottom wall 2212 are parallel to each other, the positive electrode tab and the negative electrode tab in the stacking area are parallel to the first bottom wall 2112 and/or the first side wall 2111, correspondingly, the positive electrode tab and the negative electrode tab in the stacking area are parallel to the second bottom wall 2212 and/or the second side wall 2211, and in order to achieve the buckling of the first casing 21 and the second casing 22, in some embodiments, one of the first side wall 2111 and the second side wall 2211 surrounds the other.

In a specific implementation manner of the present embodiment, the first side wall 2111 and the second side wall 2211 have unequal extension lengths in the thickness direction of the battery packaging assembly 2; and the thickness of the first side wall 2111 is greater than 1.5 times the thickness of the first bottom wall 2112, and the thickness of the second side wall 2211 is greater than 1.5 times the thickness of the second bottom wall 2212.

As shown in fig. 1 a-1 d, in some alternative embodiments, first sidewall 2111 surrounds second sidewall 2211; in other alternative embodiments, as shown in fig. 2 a-2 d, second sidewall 2211 surrounds first sidewall 2111.

In order to achieve the sealed connection between the first housing 21 and the second housing 22, in this embodiment, the battery pack assembly 2 further includes an insulating seal 24, and the insulating seal 24 is interposed between the first side wall 2111 and the second side wall 2211 to hermetically connect the first housing 21 and the second housing 22, in this embodiment, by providing the insulating seal 24 to hermetically connect the first housing 21 and the second housing 22, not only can the battery pack assembly 2 have higher strength be ensured, but also the manufacturing cost of the battery pack assembly 2 is reduced, specifically, the insulating seal 24 is connected to the first side wall 2111 or the second side wall 2211, and the insulating seal 24 circumferentially surrounds the first side wall 2111 or the second side wall 2211.

It should be noted that the insulating seal 24 is adhesive and/or the insulating seal 24 is elastic.

Specifically, when the insulating seal 24 has tackiness or the insulating seal 24 is an elastic member having tackiness, the insulating seal 24 is fused to one of the first side wall 2111 and the second side wall 2211 and adheres to the other of the first side wall 2111 and the second side wall 2211; when the insulating seal 24 is elastic; the insulating seal 24 is press-fit onto one of the first and second side walls 2111 and 2211, and the other of the first and second side walls 2111 and 2211 is press-fit with the insulating seal 24.

It should be noted that, the fusing of the insulating sealing member 24 and the pressing of the insulating sealing member 24 can be performed by corresponding devices or apparatuses, and the devices or apparatuses are not limited herein.

Further, when the insulating seal member 24 has viscosity, the insulating seal member 24 may be an insulating paste; when the insulating seal member 24 has elasticity, the insulating seal member 24 may be a rubber member; when the insulating seal member 24 is an elastic member having viscosity, the insulating seal member 24 may be a rubber member coated with an insulating paste; here, the specific type of the insulating seal member 24 is not limited.

Fig. 3a is a schematic view illustrating a state where the insulating sealing member corresponding to fig. 1a is connected to the first housing. Fig. 3b is a schematic plan view of fig. 3 a. Fig. 3c is a cross-sectional view taken along the direction E-E of fig. 3 b. Fig. 3d is an enlarged view of a portion of the structure at F in fig. 3 c.

As shown in fig. 3 a-3 d, insulating seal 24 is attached to first sidewall 2111. in some embodiments, if the height of insulating seal 24 is greater than the height of first sidewall 2111, a portion of insulating seal 24 may be exposed; if the height of the insulating seal 24 is less than or equal to the height of the first side wall 2111, the insulating seal 24 is not visible from outside the battery 10, and further, when the insulating seal 24 has viscosity or the insulating seal 24 is an elastic member having viscosity, the insulating seal 24 is fused to the first side wall 2111 and adheres to the second side wall 2211; when the insulating seal 24 has elasticity, the insulating seal 24 is pressed against the first sidewall 2111, and the second sidewall 2211 is pressed against the insulating seal 24.

Fig. 4a is a schematic view illustrating a state where the insulating sealing member corresponding to fig. 1a is connected to the second housing. Fig. 4b is a schematic plan view of fig. 4 a. Fig. 4c is a cross-sectional view of fig. 4b taken along the direction G-G. Fig. 4d is an enlarged view of a portion of the structure at H in fig. 4 c.

As shown in fig. 4 a-4 d, the insulating seal 24 is attached to the second side wall 2211, and in some embodiments, if the height of the insulating seal 24 is greater than the height of the first side wall 2111, a portion of the insulating seal 24 is exposed; if the height of the insulating seal 24 is less than or equal to the height of the first side wall 2111, the insulating seal 24 is not visible from outside the battery 10, and further, when the insulating seal 24 has viscosity or the insulating seal 24 is an elastic member having viscosity, the insulating seal 24 is fused to the second side wall 2211 and adheres to the first side wall 2111; when the insulating seal 24 has elasticity, the insulating seal 24 is pressed on the second side wall 2211, and the first side wall 2111 is pressed on the insulating seal 24.

Fig. 5a is a schematic view illustrating a state where the insulating sealing member corresponding to fig. 2a is connected to the first housing. Fig. 5b is a schematic plan view of fig. 5 a. Fig. 5c is a cross-sectional view of fig. 5b taken along the direction I-I. Fig. 5d is an enlarged view of a portion of the structure at J in fig. 5 c.

As shown in fig. 5a to 5d, the insulating seal 24 is attached to the first sidewall 2111 while the second sidewall 2211 surrounds the first sidewall 2111, so that the insulating seal 24 is not seen outside the battery 10 regardless of whether the height of the insulating seal 24 is greater than the height of the first sidewall 2111 or less than or equal to the height of the first sidewall 2111, and further, when the insulating seal 24 has viscosity or the insulating seal 24 is an elastic member having viscosity, the insulating seal 24 is fused to the first sidewall 2111 and adheres to the second sidewall 2211; when the insulating seal 24 has elasticity, the insulating seal 24 is pressed against the first sidewall 2111, and the second sidewall 2211 is pressed against the insulating seal 24.

Fig. 6a is a schematic view illustrating a state where the insulating sealing member corresponding to fig. 2a is connected to the second housing. Fig. 6b is a schematic plan view of fig. 6 a. Fig. 6c is a cross-sectional view of fig. 6b taken along the direction K-K. Fig. 6d is an enlarged view of a portion of the structure at L in fig. 6 c.

As shown in fig. 6a to 6d, the insulating seal 24 is attached to the second side wall 2211, and at this time, since the second side wall 2211 surrounds the first side wall 2111, the insulating seal 24 is not seen outside the battery 10 regardless of whether the height of the insulating seal 24 is greater than that of the first side wall 2111 or less than or equal to that of the first side wall 2111, and further, when the insulating seal 24 has viscosity or the insulating seal 24 is a viscous elastic member, the insulating seal 24 is fused to the second side wall 2211 and adheres to the first side wall 2111; when the insulating seal 24 has elasticity, the insulating seal 24 is pressed on the second side wall 2211, and the first side wall 2111 is pressed on the insulating seal 24.

In a particular implementation of this embodiment, the height of insulating seal 24 is greater than the height of first sidewall 2111.

In some other embodiments, there may be two insulating seals 24, one insulating seal 24 connected to one of the first side wall 2111 and the second side wall 2211, and another insulating seal 24 connected to the other of the first side wall 2111 and the second side wall 2211; and one insulating seal 24 abuts and surrounds the other insulating seal 24.

Specifically, when there are two insulating seals 24, the two insulating seals 24 can be named a first insulating seal and a second insulating seal, respectively, and it is defined that the first insulating seal is attached to the first side wall 2111 and the second insulating seal is attached to the second side wall 2211; at this time, when the first insulating seal and the second insulating seal both have viscosity or are elastic members having viscosity, the first insulating seal is fused to the first side wall 2111, the second insulating seal is fused to the second side wall 2211, and the first insulating seal adheres to the second insulating seal; when the first insulating seal and the second insulating seal are both elastic, the first insulating seal is pressed against the first side wall 2111, the second insulating seal is pressed against the second side wall 2211, and the first side wall 2111 and the second side wall 2211 are pressed; when the first insulating seal is sticky or elastic, and the second insulating seal is elastic, the first insulating seal is fused to the first side wall 2111, the second insulating seal is pressed against the second side wall 2211, and the first insulating seal is bonded to the second insulating seal; when the first insulating seal has elasticity and the second insulating seal has viscosity or is an elastic member having viscosity, the first insulating seal is pressed against the second side wall 2211, the second insulating seal is fused to the first side wall 2111, and the first insulating seal is bonded to the second insulating seal.

In order to connect the positive and negative tabs to the battery pack assembly 2, in some embodiments, the first housing 21 has a first welding region (not shown) for connecting the positive tabs, and the second housing 22 has a second welding region (not shown) for connecting the negative tabs.

In order to prevent the first welding area and the second welding area from being welded through, it should be ensured that the penetration depth of the positive tab during welding is smaller than the thickness of the first case 21, and the penetration depth of the negative tab during welding is smaller than the thickness of the second case 22, wherein the penetration depth refers to the distance between the deepest position of the melting part of the base material and the surface of the base material.

In some alternative embodiments, in order to prevent the first welding region and the second welding region from being welded through, the battery 10 may further include the reinforcement 3, and the reinforcement 3 may be disposed outside the first sidewall 2111, in which case the reinforcement 3 is disposed corresponding to the first welding region; further, the reinforcement 3 may be disposed outside the second side wall 2211, in which case the reinforcement 3 is disposed corresponding to the second welding region.

In a specific embodiment of the present embodiment, the reinforcement 3 is disposed outside the second housing 22, i.e., the reinforcement 3 is disposed corresponding to the second welding region; the reinforcing member 3 is a metal sheet structure welded to the outer side of the second casing 22, and the metal used for the reinforcing member 3 may or may not be the same as the second casing 22, and the specific type of the metal used for the reinforcing member 3 is not limited herein.

In the present embodiment, the reinforcement 3 and the insulating seal member 24 have a space therebetween in the thickness direction of the battery pack assembly 2, and the space is greater than 0.5 mm.

In some embodiments, the reinforcing member 3 is provided on one of the first and second side walls 2111 and 2211 having a large extension length in the thickness direction of the battery packaging assembly 2.

Further, in order to further improve the safety of the battery 10, in some specific embodiments, the first case 21 or the second case 22 is provided with an explosion-proof groove 4; when the first housing 21 is provided with the explosion-proof slot 4, the extension length of the first side wall 2111 is smaller than that of the second side wall 2211; when the explosion-proof slot 4 is formed in the second housing 22, the extension length of the second side wall 2211 is smaller than that of the first side wall 2111. By arranging the explosion-proof groove 4, when the inside of the battery 10 explodes, the bottom of the explosion-proof groove 4 is firstly exploded to remind a user that the battery 10 cannot be normally used, so that the battery 10 can be maintained or replaced.

In this embodiment, the explosion-proof slot 4 is opened on the outer surface of the first housing 21, specifically, the explosion-proof slot 4 is opened on the outer surface of the first bottom wall 2112, at this time, the extension length of the first side wall 2111 is smaller than the extension length of the second side wall 2211, the slot depth of the explosion-proof slot 4 is smaller than the thickness of the first housing 21, specifically, the explosion-proof slot 4 includes a first slot section 41 and a second slot section 42 which are perpendicular to each other, so that the explosion-proof slot 4 is in an "L" shape; in other embodiments, the explosion-proof groove 4 may have other shapes, and the other shapes are not limited herein.

The explosion-proof groove 4 is formed by stamping or laser etching, and in some other embodiments, the explosion-proof groove 4 may be formed by other forming processes.

In the present embodiment, the battery 10 further includes an insulating member (not shown), the insulating member 10 is disposed between the winding core 1 and the first case 21 or the second case 22, and the insulating member is used for insulating and connecting the winding core 1 and one of the first side wall 2111 and the second side wall 2211, which has a small extension length in the thickness direction of the battery packaging assembly 2.

Further, in the manufacturing process of the battery 10, it is necessary to inject the electrolyte into the winding core 1, specifically, in some embodiments, the winding core 1 may be first placed in one of the first case 21 and the second case 22, then the electrolyte is injected into the winding core 1, and then the first case 21, the second case 22 and the insulating sealing member 24 are encapsulated; in some other embodiments, the first casing 21, the second casing 22, and the insulating seal 24 may be sealed, and then the pouring hole 5 may be opened in the first casing 21 or the second casing 22, so that the electrolyte may be injected into the winding core 1 through the pouring hole 5.

In a specific embodiment of the present embodiment, the second case 22 has a liquid injection hole 5, and the device for injecting the electrolyte may be a liquid injection needle or the like, and the device for injecting the electrolyte is not particularly limited.

In order to improve the safety performance of the battery 10, in the process of manufacturing the battery 10, the moisture inside the winding core 1 needs to be dried, and in some embodiments, when the liquid injection hole 5 is not formed in both the first case 21 and the second case 22, after the winding core 1 is placed in the second case 22, the winding core 1 needs to be dried, and then the subsequent packaging process is performed; in this embodiment, since the second case 22 has the pouring hole 5, after the battery 10 is completely sealed, the entire battery is dried, and the moisture in the winding core 1 is removed from the pouring hole 5.

It should be noted that the drying manner may be baking in an oven, and the drying manner is not particularly limited.

Further, in this embodiment, since the second case 22 has the liquid filling hole 5, the liquid filling hole 5 needs to be sealed after the battery is baked, the liquid on the sidewall of the liquid filling hole 5 needs to be wiped before sealing, for example, by wiping with a non-woven fabric, after the sidewall of the liquid filling hole 5 is wiped, the sealing of the liquid filling hole 5 can be achieved by welding a corresponding metal sealing nail outside the liquid filling hole 5, where the metal sealing nail may be a metal plate, and the type of metal used for the metal sealing nail is not particularly limited.

The battery provided by the embodiment comprises a winding core and a battery packaging component; the winding core comprises at least two pole pieces with opposite polarities, a first pole lug and a second pole lug are respectively formed on the at least two pole pieces, the winding core is provided with a stacking area, and the at least two pole pieces in the stacking area are stacked mutually; the battery packaging assembly comprises a first shell, a second shell and an insulating sealing element, wherein the first shell and the second shell are mutually buckled to form a cavity, and the winding core is positioned in the cavity; the first shell is provided with a first welding area connected with the first pole lug, and the second shell is provided with a second welding area connected with the second pole lug; the first shell comprises a first bottom wall and a first side wall arranged around the first bottom wall, the second shell comprises a second bottom wall and a second side wall arranged around the second bottom wall, the first bottom wall and the second bottom wall are oppositely arranged in the thickness direction of the battery packaging assembly, the first bottom wall is parallel to the second bottom wall, one of the first side wall and the second side wall surrounds the other, the insulating sealing element is clamped between the first side wall and the second side wall, and the extension lengths of the first side wall and the second side wall in the thickness direction of the battery packaging assembly are not equal; the pole piece in the overlapping area is parallel to the first bottom wall and/or the first side wall. The battery provided by the embodiment has low manufacturing cost.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.