CN211789106U

CN211789106U - Battery and battery module

Info

Publication number: CN211789106U
Application number: CN202020461170.0U
Authority: CN
Inventors: 廖正远; 曾毅; 郑卫鑫; 王永南
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2020-10-27
Anticipated expiration: 2030-04-01

Abstract

The application discloses battery and battery module. The battery comprises a battery shell and a battery envelope covering the outer wall of the battery shell, the battery envelope comprises a first insulating film and a second insulating film which are arranged in a stacked mode, and the first insulating film covers the second insulating film. The battery of this application has solved the diolame paper that adopts single-layer membrane structure among the prior art, can lead to the electric leakage during slight fish tail, and if uses single-layer membrane structure's diolame paper diolame twice, can lead to increasing material and operation, and then has improved the problem of human cost and material cost.

Description

Battery and battery module

Technical Field

The application relates to the field of new energy vehicles, in particular to a battery and a battery module.

Background

In the field of new energy automobiles, most of the electric core wrapping film paper used in the market is single-layer films, and small holes or other defects can be generated on the films in the production process of the wrapping film paper, so that electric leakage of an electric core is caused. In the process of coating the battery cell, if the coated paper with a single-layer film structure is adopted in the operation of a die set, electric leakage can be caused during slight scratching, and if the coated paper with the single-layer film structure is used for coating twice, materials and operation procedures can be increased, so that the labor cost and the material cost are increased.

SUMMERY OF THE UTILITY MODEL

The application provides a battery and battery module to adopt the envelope paper of individual layer membrane structure among the solution prior art, can lead to the electric leakage during slight fish tail, and if use the envelope paper envelope twice of individual layer membrane structure, can lead to increasing material and operation, and then improved human cost and material cost's problem.

In a first aspect, the present application provides a battery, including a battery case and a battery capsule covering an outer wall of the battery case, where the battery capsule includes a first insulating film and a second insulating film stacked on each other, and the first insulating film covers the second insulating film.

In one possible embodiment, the first insulating film and the second insulating film are different in color.

In one possible embodiment, the first insulating film and the second insulating film are made of different materials.

In one possible embodiment, the first insulating film and the second insulating film are bonded to each other by a first adhesive layer.

In one possible embodiment, the battery envelope further includes a protective film covering a side of the first insulating film facing away from the second insulating film.

In one possible embodiment, the first insulating film and the protective film are bonded to each other by a second adhesive layer.

In one possible embodiment, the first insulating film is white in color, and the second insulating film is black in color.

In a possible embodiment, the outer wall of the battery case includes a bottom wall and four side walls connected in sequence and arranged on the periphery of the bottom wall, and a side of the first insulating film facing away from the second insulating film is fixed to the bottom wall and the four side walls.

In a possible embodiment, the four sidewalls are a first sidewall, a second sidewall, a third sidewall and a fourth sidewall, respectively, the first sidewall and the third sidewall are disposed opposite to each other, the second sidewall and the fourth sidewall are disposed opposite to each other, the areas of the first sidewall and the third sidewall are larger than the areas of the second sidewall and the fourth sidewall, the battery envelope has a closed edge, and the closed edge is fixed to the first sidewall and the third sidewall to close the opening of the battery envelope.

In a second aspect, the present application provides a battery module, which includes a support and a plurality of batteries as described above disposed on the support.

The technical scheme of this application sets up the bilayer membrane structure for having two-layer insulation film through the diolame with the battery, because membrane class structure produces the possibility of battery electric leakage when defects such as aperture in the production process when adopting single-layer membrane structure on the one hand can be reduced by a wide margin, and the damage resistance of bilayer membrane structure can be strong, can reduce the possibility of battery diolame because of receiving the fish tail and leading to the electric leakage to minimum. On the other hand, the battery envelope directly formed by two layers of insulating films can effectively reduce the operation process and material cost caused by twice envelope by adopting a single-layer film structure, and simultaneously can reduce the assembly error caused when the envelope and the battery are assembled to the minimum compared with the twice envelope process, thereby improving the adhesive property of the battery envelope.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings required for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a battery module according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a battery provided in an embodiment of the present application;

FIG. 3 is a schematic structural view of the battery case shown in FIG. 2;

FIG. 4 is a schematic structural diagram of a battery capsule provided in an embodiment of the present application;

fig. 5 is a schematic structural view of a first step of coating the battery case with the battery capsule shown in fig. 4;

fig. 6 is a structural view illustrating a second step of coating the battery case with the battery capsule shown in fig. 4;

fig. 7 is a structural view illustrating a third step of coating the battery case with the battery capsule shown in fig. 4;

fig. 8 is a schematic structural view of a fourth step of coating the battery case with the battery capsule shown in fig. 4;

fig. 9 is a schematic structural view of a fifth step of coating the battery case with the battery capsule shown in fig. 4;

fig. 10 is a schematic sectional view of the layer structure of the battery envelope shown in fig. 4;

fig. 11 is an enlarged sectional view of region I of the battery pack shown in fig. 10.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The application provides a battery module, battery module can provide reliable drive power demand for the car to in-service use of car.

Referring to fig. 1, the battery module 300 includes a bracket 310 and a plurality of batteries 200, wherein the plurality of batteries 200 are arranged in a row and are accommodated in the bracket 310, and two adjacent batteries 200 are spaced apart from each other by a spacer 320. The bracket 310 includes two side plates 311 disposed opposite to each other and an end plate 312 connecting the two side plates 311, and the two side plates 311 and the two end plates 312 enclose the bracket 310 forming a frame structure having a hollow shape, so that the plurality of batteries 200 can be confined therein. The two end plates 312 are respectively connected to the two batteries 200 located at the head and the tail of the plurality of batteries 200, and the two side plates 311 are connected to the two side surfaces of each battery 200 corresponding to the two side plates 311, respectively, so that the fastening force between the bracket 310 and the plurality of batteries 200 can be improved, and the sealing property and the reliability of the battery module 300 during packaging can be ensured.

Referring to fig. 2, the battery 200 includes a battery case 210 and a battery pack 100 covering an outer wall of the battery case 210. It can be understood that, after the battery 200 is manufactured, in order to prevent the surface of the battery case 210 from being scratched in the subsequent transportation and assembly processes, and to ensure that the battery 200 does not leak electricity when not being used, and meanwhile, in order to avoid the influence of an internal short circuit caused by a short circuit between the positive electrode and the negative electrode during the use process on the whole power system, the battery capsule 100 needs to be wrapped on the surface of the battery case 210 of the manufactured battery 200, and the battery capsule 100 plays an insulating and protecting role, thereby playing both waterproof and dustproof roles, and better protecting the battery 200.

In one possible embodiment, the battery pack 100 is removed when the battery 200 is mounted to the battery module 300, and only serves a protective function during the transportation of the battery 200. In another possible embodiment, the battery pack 100 is retained when the battery 200 is mounted to the battery module 300.

Referring to fig. 2, 3 and 4, the battery case 210 is a rectangular parallelepiped. The battery case 210 is defined as an X-direction in a length direction, a Y-direction in a width direction, and a Z-direction in a height direction.

The outer wall of the battery case 210 includes a bottom wall 211 and four side walls, namely a first side wall 212, a second side wall 213, a third side wall 214 and a fourth side wall 215, which are sequentially connected and are disposed at the periphery of the bottom wall 211, wherein the first side wall 212 and the third side wall 214 are disposed oppositely, and the second side wall 213 and the fourth side wall 215 are disposed oppositely. It is understood that the areas of the first and

third sidewalls

212 and 214 are the same, the areas of the second and

fourth sidewalls

213 and 215 are the same, and the areas of the first and

third sidewalls

212 and 214 are larger relative to the areas of the third and

fourth sidewalls

213 and 215, i.e., the areas of the first and

third sidewalls

212 and 214 are larger than the areas of the third and

fourth sidewalls

213 and 215. Accordingly, the first sidewall 212 and the third sidewall 214 are defined as large faces (sidewalls having the largest area), and the second sidewall 213 and the fourth sidewall 215 are defined as small faces (sidewalls having the smallest area).

Further, referring to fig. 1 again, during the assembly process of the battery module 300, the plurality of batteries 200 are arranged in a large-to-large manner, which is more favorable for improving the overall structural strength of the battery assembly 200 than the small-to-small arrangement.

Referring again to fig. 2 to 4, in order to adapt the shape of the battery 200, the battery pack 100 is cut in a cross shape so as to cover the bottom wall 211, the first side wall 212, the second side wall 213, the third side wall 214, and the fourth side wall 215 of the battery case 210. Specifically, the battery pack 100 includes a bottom 110 (an inner portion of a dashed line frame in fig. 4), a first side 120 and a second side 130, the bottom 110 includes four sides 111 connected in sequence, the first side 120 is connected to two sides 111 of the four sides 111, two sides 111 are disposed opposite to each other, and the second side 130 is connected to the other two sides 111. In other words, the bottom 110 may be a portion of the battery pack 100 located at the center, and the first and

second sides

120 and 130 may be extensions formed by extending the respective sides 111 thereof. The bottom portion 110 is for fixing to the bottom wall 211 of the battery case 210, and the first side portion 120 and the second side portion 130 are for fixing to four sequentially connected side walls of the battery case 210.

Specifically, the two first side portions 120 correspond to the first sidewall 212 and the third sidewall 214 of the large face, respectively, and the two second side portions 130 correspond to the second sidewall 213 and the fourth sidewall 215 of the small face, respectively. That is, the two first sides 120 can be respectively fixed to the first side wall 212 and the third side wall 214, and the two second sides 130 can be respectively fixed to the second side wall 213 and the fourth side wall 215, so that the bottom wall 211 of the battery case 210 and four side walls connected in sequence can be covered by the battery envelope 100, and the insulation protection performance of the battery 200 is improved. In other words, the first side 120 and the second side 130 are bendable portions of the battery pack 100, and are attached to the first side 212, the second side 213, the third side 214, and the fourth side 215 of the battery case 210 by a change in shape such as bending.

It can be understood that the size of the bottom 110 is greater than or equal to the size of the bottom wall 211 of the battery shell 210, so that the bottom wall 211 of the battery shell 210 can be completely covered, each position of the bottom wall 211 of the battery shell 210 is ensured to fall within the covering range of the battery envelope 100, the possibility of electric leakage of the battery envelope 100 is reduced, the protection effect of the battery envelope 100 is improved, and the insulation protection of the battery 200 is facilitated. When the first side portion 120 and the second side portion 130 are attached to the battery shell 210, the dimension of the first side portion 120 in the Z direction is greater than the dimension of the battery shell 210 in the Z direction, so that the first side portion 120 can have a portion exceeding the first side wall 212 and the third side wall 214, and the dimension of the second side portion 130 in the Y direction is greater than the dimension of the battery shell 210 in the Y direction, so that the second side portion 130 can also have a portion exceeding the second side wall 213 and the fourth side wall 215, and the excess portions of the first side portion 120 and the second side portion 130 can enable the battery envelope 100 to have a certain coating margin in the process of coating the battery shell 210, thereby effectively avoiding the problem that the insulating performance of the battery 200 is greatly reduced due to the occurrence of a package leakage phenomenon in the battery shell 210, and being beneficial to improving the insulating protection of the battery 200.

Further, the excess portion of the first side portion 120 is attached to a top wall (not labeled) of the battery case 210 opposite to the bottom wall 211, and the excess portion of the second side portion 130 is attached to the first side wall 212 and the third side wall 214.

As will be described in detail below, the step of wrapping the battery case 210 with the battery pack 100 includes at least the following steps S1 to S5:

s1: the bottom 110 of the battery capsule 100 is aligned with the bottom wall 211 of the battery case 210 such that the bottom 110 of the battery capsule 100 is attached to the bottom wall 211 of the battery case 210.

Referring to fig. 4 and 5 together, it can be understood that, since the battery envelope 100 is cross-shaped, the bottom 110 is a cross-shaped middle portion, which can effectively play a role in reminding, so that the bottom wall 211 of the battery housing 210 can be quickly aligned to the bottom 110 of the battery envelope 100, which is clear, striking, convenient and quick, and the bottom surface of the battery 200 after being enveloped can be as flat as possible, which is beneficial for the battery 200 to be in contact with a heat dissipation heating system for good heat exchange.

S2: one first side portion 120 of the two battery packs 100 is bent toward the top of the battery case 210 along the bottom 110 of the battery case 210 so that the first side portion 120 can be attached to the corresponding side wall of the battery case 210.

Referring to fig. 4 and fig. 6, it can be understood that, in the embodiment of the present application, the dimension of each of the two second side portions 130 in the X direction is greater than the dimension of the corresponding second side wall 213 and the corresponding fourth side wall 215 in the X direction, so that when each first side portion 120 is bent, the portion of the two adjacent second side portions 130 that is located on the same side as the first side portion 120 is also bent. In this step, the first side 120 is the portion of the battery pack 100 corresponding to the first side 212 of the battery case 210.

S3: the other first side 120 of the two battery packs 100 is bent toward the top of the battery case 210 along the bottom 110 of the battery case 210 so that the first side 120 can be attached to the corresponding side wall of the battery case 210.

Referring to fig. 4 and fig. 7, it can be understood that, in the embodiment of the present application, the dimension of each of the two second side portions 130 in the X direction is greater than the dimension of the corresponding second side wall 213 and the corresponding fourth side wall 215 in the X direction, so that when each first side portion 120 is bent, the portion of the two adjacent second side portions 130 that is located on the same side as the first side portion 120 is also bent. In this step, the first side 120 is a portion of the battery pack 100 corresponding to the third side 214 of the battery case 210. Therefore, the first side wall 212 and the third side wall 214 of the battery shell 210 are both covered by the first side part 120 of the battery capsule 100, and the part of each second side part 130, which is positioned on the same side as the two first side parts 120, is bent, so that each position of the first side wall 212 and the third side wall 214 can be covered by the battery capsule 100, and the insulation protection performance of the battery capsule 100 is further improved.

S4: one second side portion 130 of the two of the battery packs 100 is bent toward the top of the battery case 210 along the bottom 110 of the battery case 210 so that the second side portion 130 can be attached to the corresponding side wall of the battery case 210.

Referring to fig. 4 and 8, it can be understood that, since each second side portion 130 is bent in the foregoing step, in the process of attaching the second side portion 130 to the corresponding side wall of the battery case 210, by folding at least a portion of the second side portion 130 at the corner of the battery case 210 inward, the major portion of the second side portion 130 covers the corresponding side wall, and the minor portion of the second side portion 130 covers two adjacent side walls of the corresponding side wall, so that the second side portion 130 can be fixed to the corresponding side wall without cutting, and the interface between the second side portion 130 and two adjacent first side portions 120 is sealed, which makes the battery envelope 100 have no position of leakage envelope, and can further improve the insulation protection capability of the battery 200. In this step, the second side 130 is a portion of the battery pack 100 corresponding to the second side wall 213 of the battery case 210, and two adjacent first sides 120 are portions of the battery pack 100 corresponding to the first side wall 212 and the third side wall 214 of the battery case 210.

S5: the other second side 130 of the two of the battery packs 100 is bent toward the top of the battery case 210 along the bottom 110 of the battery case 210 so that the second side 130 can be attached to the corresponding side wall of the battery case 210.

Referring to fig. 4 and 9, it can be understood that, since each second side portion 130 is bent in the foregoing step, in the process of attaching the second side portion 130 to the corresponding side wall of the battery case 210, a major portion of the second side portion 130 covers the corresponding side wall by folding at least a portion of the second side portion 130 at the corner of the battery case 210, and a minor portion of the second side portion 130 covers two adjacent side walls of the corresponding side wall, so that the second side portion 130 can be fixed to the corresponding side wall without cutting, and the interface between the second side portion 130 and the two adjacent first side portions 120 is sealed. This arrangement makes it possible to further improve the insulation protection capability of the battery 200 by eliminating the position of the battery pack 100 where the battery pack leaks. In this step, the second side 130 is a portion of the battery pack 100 corresponding to the fourth side 215 of the battery case 210, and two adjacent first sides 120 are portions of the battery pack 100 corresponding to the first side 212 and the third side 214 of the battery case 210.

Thus, the battery capsule 100 has a reduced edge 140, the reduced edge 140 being secured to the first sidewall 212 and the third sidewall 214 to close the battery capsule. It will be appreciated that the reduced edge 140 is formed by the portion of the second side 130 that extends beyond the second side 123 and the fourth side 125, such that both second sides 130 terminate at the first side 212 and the third side 214, i.e., the battery capsule 100 terminates at the first side 212 and the third side 214, which can overlap the first side 212 and the third side 214 after being encapsulated, thereby preventing thickness errors from accumulating and affecting the adhesion of subsequent batteries 200 to the side 311. In other words, the battery pack 100 is completely wrapped around the battery case 210, and the step of wrapping the battery pack 100 is terminated on the large surface (the first side wall 212 and the third side wall 214) of the battery case 210. On one hand, the large surface has a larger area, the battery envelope can be conveniently formed into a complete coating effect, the adhesion effectiveness and the reliability are high, the risk of electric leakage of the battery 200 easily generated when the bottom wall 211 is closed is avoided, on the other hand, the surfaces of the second side wall 213 and the fourth side wall 215 of the battery shell 210 after being coated are smooth, so that when the second side wall 213 and the fourth side wall 215 of the battery shell 210 after being coated are glued, the glue can be fully attached to the second side wall 213 and the fourth side wall 215 of the battery shell 210 after being coated, the problem that the second side wall 213 and the fourth side wall 215 after being coated cannot be reliably bonded to the corresponding side plates 311 is effectively solved, and the fastening force of the second side wall 213 and the fourth side wall 215 of the battery shell 210 after being coated to the corresponding side plates 311 is improved.

Referring to fig. 10 and 11 together, in the embodiment of the present application, the battery capsule 100 is formed by laminating a plurality of layers. The battery pack 100 includes a first insulating film 10 and a second insulating film 20 which are stacked, a side of the first insulating film 10 facing away from the second insulating film 20 is fixed to a bottom wall 211 and four side walls, and the first insulating film 10 covers the second insulating film 20 to protect the second insulating film 20.

By providing the battery capsule 100 as a double-layer structure having two layers of insulating films, on the one hand, the possibility of leakage of the battery 200 due to defects such as pinholes generated by the film structure in the production process can be greatly reduced when a single-layer structure is adopted, and the double-layer structure has strong damage resistance, and can reduce the possibility of leakage of the battery capsule 100 due to scratches to the minimum. On the other hand, the battery capsule 100 directly formed with two insulating films can effectively reduce the operation process and material cost caused by twice capsule with single-layer film structure, and simultaneously can reduce the assembly error caused by the capsule and the battery 200 to the minimum compared with the twice capsule process, thereby improving the adhesive property of the battery capsule 100.

It is understood that the outer walls are the bottom wall 211, the first side wall 212, the second side wall 213, the third side wall 214, and the fifth side wall 215 of the battery case 210 as described above.

In one possible embodiment, the first insulating film 10 and the second insulating film 20 are different in color and may be made of the same material or different materials, so that they can be distinguished from other battery envelopes 100 having only a single-layer film structure by the difference in color, and it is easy to directly confirm which envelope is used by visual observation, and they are easy to use and highly reliable. For example, the first insulating film 10 and the second insulating film 20 may be made of the same material, and may be PET films, which have good transparency, high glossiness, good air tightness, excellent mechanical properties, and good heat resistance, cold resistance, chemical resistance, oil resistance, and toughness. Alternatively, the material of the first insulating film 10 and the second insulating film 20 may be different, so that when the second insulating film 20 is scratched, which insulating film the scratch is located on can be observed with naked eyes, facilitating subsequent rework.

Further, the color of the first insulating film 10 may be white, and the color of the second insulating film 20 may be black. Thus, the surface of the second insulating film 20 facing away from the first insulating film 10 is the outer surface of the battery pack 100, i.e., the surface exposed to the outside after the pack. Of course, in other embodiments, the color of the first insulating film 10 may be white, and the color of the second insulating film 20 may be black, which is not limited in the present application.

In another possible embodiment, the first insulating film 10 and the second insulating film 20 are the same in color and different in material, so that when the second insulating film 20 is scratched, it can be observed whether the first insulating film 10 is damaged, when the first insulating film 10 is not damaged, the first insulating film 10 can continue to provide protection for the battery case 210, and an early warning effect is achieved, and when the first insulating film 10 is also damaged, the battery envelope 100 can be replaced.

It is understood that, since the battery pack 100 needs to be adhered to the battery case 210, that is, the battery pack 100 itself needs to have an adhesive property, the side of the first insulating film 10 away from the second insulating film 20 is provided with the second adhesive layer 30, and the second adhesive layer 30 is adhered to the outer surface of the battery case 210, so as to adhere the entire battery pack 100 to the battery case 210.

Further, the battery capsule 100 further includes a protection film 50, wherein the protection film 50 covers a side of the first insulation film 10 away from the second insulation film 20, specifically, the protection film 50 covers a side of the second adhesive layer 30 away from the first insulation film 10. Therefore, the protective film 50 covers the second adhesive layer 30, so that the second adhesive layer 30 can be protected from being contaminated when not in use, and when the second adhesive layer 30 needs to be used, the battery envelope 100 can be adhered to the battery 200 through the second adhesive layer 30 by directly removing the protective film 50, so that the practicability is high, and the application range is wide. In one possible embodiment, the protective film 50 is a centrifugal paper.

In the embodiment of the present application, the first insulating film 10 and the second insulating film 20 are made of insulating materials, and the first insulating film 10 and the second insulating film 20 are bonded by the first adhesive layer 40. Of course, in other embodiments, the first insulating film 10 and the second insulating film may be integrally formed by a special hot-pressing process to completely adhere the two insulating films together, so that the connection strength between the two insulating films is strong, the reliability is strong, and the integrally formed battery envelope 100 may form an integrated film structure with a relatively slightly thicker thickness compared with an envelope with a single-layer film structure, and the damage resistance is correspondingly enhanced.

The technical scheme of this application sets up battery capsule 100 into the bilayer membrane structure who has two-layer insulating film, on the one hand can reduce by a wide margin when adopting single-layer membrane structure because membrane class structure produces the possibility of battery 200 electric leakage when defects such as aperture in the production process, and bilayer membrane structure's damage resistance can be strong, can reduce the possibility of battery capsule 100 because of receiving the fish tail and leading to the electric leakage to the minimum. On the other hand, the battery capsule 100 directly formed with two insulating films can effectively reduce the operation process and material cost caused by twice capsule with single-layer film structure, and simultaneously can reduce the assembly error caused by the capsule and the battery 200 to the minimum compared with the twice capsule process, thereby improving the adhesive property of the battery capsule 100.

The embodiments of the present invention have been described in detail, and the principles and embodiments of the present invention have been explained herein using specific embodiments, and the above description of the embodiments is only used to help understand the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the specific implementation and application scope, to sum up, the content of the present specification should not be understood as the limitation of the present invention.

Claims

1. The battery is characterized by comprising a battery shell and a battery envelope covering the outer wall of the battery shell, wherein the battery envelope comprises a first insulating film and a second insulating film which are arranged in a stacked mode, and the first insulating film covers the second insulating film.

2. The battery according to claim 1, wherein the first insulating film and the second insulating film are different in color.

3. The battery according to claim 1, wherein the first insulating film and the second insulating film are different in material.

4. The battery according to claim 1, wherein the first insulating film and the second insulating film are bonded to each other by a first adhesive layer.

5. The battery of claim 1, wherein the battery envelope further comprises a protective film covering a side of the first insulating film facing away from the second insulating film.

6. The battery according to claim 5, wherein the first insulating film and the protective film are bonded by a second adhesive layer.

7. The battery according to claim 2, wherein the first insulating film is white in color and the second insulating film is black in color.

8. The battery of claim 1, wherein the outer wall of the battery case includes a bottom wall and four side walls connected in series at a periphery of the bottom wall, and a side of the first insulating film facing away from the second insulating film is fixed to the bottom wall and the four side walls.

9. The battery of claim 8, wherein the four sidewalls are a first sidewall, a second sidewall, a third sidewall, and a fourth sidewall, respectively, the first sidewall and the third sidewall are disposed opposite to each other, the second sidewall and the fourth sidewall are disposed opposite to each other, the area of the first sidewall and the third sidewall is larger than the area of the second sidewall and the fourth sidewall, and the battery capsule has a reduced edge that is fixed to the first sidewall and the third sidewall to close the battery capsule.

10. A battery module comprising a holder and a plurality of batteries according to any one of claims 1 to 9 mounted on the holder.