WO2021196033A1

WO2021196033A1 - Battery structure

Info

Publication number: WO2021196033A1
Application number: PCT/CN2020/082601
Authority: WO
Inventors: 曾朝勇
Original assignee: 东莞新能安科技有限公司
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-10-07
Also published as: CN113383457A; CN113383457B

Abstract

A battery structure, comprising a housing, a battery cell module, a heat shrinkable film, a first buffer layer, a second buffer layer and a glue layer. The housing comprises an upper cover, a lower cover, and side plates connecting the upper cover and the lower cover. The upper cover, the lower cover and the side plates are enclosed to form an accommodating cavity, and the lower cover is provided with a pressure relief groove that communicates with the accommodating cavity. The battery cell module is accommodated in the accommodating cavity; and the heat shrinkable film covers the battery cell module, and the heat shrinkable film is provided with a first through hole corresponding to the pressure relief groove. The first buffer layer is located between the heat shrinkable film and the lower cover, the first buffer layer is provided with a second through hole, and the second through hole communicates with the first through hole and the pressure relief groove. The second buffer layer surrounds the battery cell module and is located between the heat shrinkable film and the side plates. The glue layer is poured between the housing and the second buffer layer. The battery structure facilitates disassembly and exhaust, thus helping to prolong the service life.

Description

Battery structure

Technical field

This application relates to a battery structure.

Background technique

Batteries have the advantages of large specific energy, high working voltage, low self-discharge rate, small size, light weight, etc., and are widely used in daily life. When the battery cell module is packaged to form a battery, the inside of the shell is filled with glue, and the cell module and the shell are bonded through the glue layer to fix the cell module. However, because the battery cell is wrapped by the adhesive layer, the battery cannot be eliminated in time when the battery generates gas, which easily causes the battery to deform, and the adhesive layer adheres to the battery cell module when the battery is disassembled, which is easy to remove the adhesive layer. Damage the battery cell module.

Summary of the invention

In view of the above situation, it is necessary to provide a battery structure that is conducive to prolonging the service life.

A battery structure, including:

The housing includes an upper cover, a lower cover, and a side plate connecting the upper cover and the lower cover. The upper cover, the lower cover and the side plate are surrounded to form an accommodating cavity, and the lower cover is provided with a communication The pressure relief groove of the accommodating cavity;

The battery cell module is housed in the accommodating cavity;

A heat shrinkable film covering the battery cell module, and the heat shrinkable film is provided with a first through hole corresponding to the pressure relief groove;

The first buffer layer is located between the heat shrinkable film and the lower cover, and the first buffer layer is provided with a second through hole, and the second through hole communicates with the first through hole and the leak Pressure groove

A second buffer layer, which surrounds the cell module and is located between the heat shrinkable film and the side plate; and

The glue layer is poured between the shell and the second buffer layer.

As a solution of the present application, the battery structure further includes a third buffer layer located between the heat shrinkable film and the bottom of the battery cell module facing the lower cover, and The third buffer layer is provided with an opening corresponding to the first through hole.

As a solution of the present application, a groove is provided on the surface of the third buffer layer facing away from the lower cover, and the groove is in communication with the second through hole.

As a solution of the present application, the cell module includes a plurality of stacked cell units, and the stacking direction of the cell units is parallel to the lower cover.

As a solution of the present application, the surface of the third buffer layer facing away from the lower cover is provided with a groove along the stacking direction, and the groove is communicated with the second through hole.

As a solution of the present application, the battery structure further includes a fourth buffer layer, and the fourth buffer layer is located between the heat shrinkable film and the side wall of the battery module facing the side plate.

As a solution of the present application, the fourth buffer layer is also arranged between the adjacent battery cells.

As a solution of the present application, the fourth buffer layer is provided with exhaust grooves along a direction perpendicular to the third buffer layer.

As a solution of the present application, the first buffer layer and the second buffer layer are foam.

As a solution of the present application, the groove penetrates the outer periphery of the first buffer layer.

In the battery structure of the present application, the battery cell module is covered with a heat shrinkable film to prevent the glue layer from contacting the battery cell module when the glue layer is formed by pouring glue, thereby facilitating the subsequent disassembly of the battery structure and reducing damage Damage to the battery cell module. Secondly, the gas produced by the cell module is guided by the heat shrinkable film, and the first through hole on the heat shrinkable film communicates with the pressure relief groove through the second through hole on the first buffer layer, thereby realizing the internal high-pressure gas Directional discharge avoids the deformation of the battery structure, thereby prolonging the service life of the battery structure and the battery cell module.

Description of the drawings

FIG. 1 is a schematic diagram of a battery structure according to an embodiment of the application.

FIG. 2 is a schematic diagram of a disassembly of a method of the battery structure according to an embodiment of the application.

FIG. 3 is a schematic diagram of another way of disassembling the battery structure according to an embodiment of the application.

Fig. 4 is a top view of the battery structure of an embodiment of the application with the upper cover removed.

FIG. 5 is a partial disassembly schematic diagram of a battery structure according to an embodiment of the application.

FIG. 6 is a partial schematic diagram of a battery structure according to an embodiment of the application.

Symbol description of main components

电池结构 Battery structure	100100
外壳 shell	1010
电芯模组 Cell module	2020
热缩膜Heat shrinkable film	3030
第一缓冲层 First buffer layer	4040
第二缓冲层 Second buffer layer	5050
胶层 Glue layer	6060
上盖 Upper cover	1111
下盖 lower lid	1313
侧板 Side panel	1515
容置腔Accommodating cavity	1616
泄压槽 Pressure relief groove	130130
第一通孔First through hole	3131
第二通孔Second through hole	4141
第一部分 first part	5151
第二部分the second part	5252
第三部分the third part	5353

第四部分the fourth part	5454
第三缓冲层 Third buffer layer	7070
开口 Opening	7171
沟槽 Groove	7373
外周缘 Outer periphery	701701
侧壁 Sidewall	201201
电芯单元Cell unit	21twenty one
第四缓冲层 Fourth buffer layer	8080
排气槽 Exhaust slot	8181
泄压阀 Pressure relief valve	9090
密封圈 Sealing ring	9595

The following specific embodiments will further illustrate this application in conjunction with the above-mentioned drawings.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terms used in the specification of the application herein are only for the purpose of describing specific embodiments, and are not intended to limit the application.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Referring to FIGS. 1 to 6, the battery structure 100 includes a casing 10, a battery cell module 20, a heat shrinkable film 30, a first buffer layer 40, a second buffer layer 50 and an adhesive layer 60. Wherein, the battery cell module 20, the heat shrinkable film 30, the first buffer layer 40, the second buffer layer 50, and the glue layer 60 are contained in the housing 10.

1 and 2, the housing 10 includes an upper cover 11, a lower cover 13, and a side plate 15 connecting the upper cover 11 and the lower cover 13. The upper cover 11, the lower cover 13 and the side plate 15 are enclosed to form an accommodating cavity 16 (as shown in FIG. 4). The lower cover 13 is provided with a pressure relief groove 130, and the pressure relief groove 130 is in communication with the containing cavity 16.

In this embodiment, the upper cover 11 can be made of a metal material or a high-temperature resistant plastic material. The lower cover 13 and the side plate 15 may be made of metal materials, such as aluminum alloy. In some embodiments, the lower cover 13 and the side plate 15 may also be made of high-temperature resistant plastic materials.

Referring to FIGS. 3 and 4, the heat-shrinkable film 30 covers the battery cell module 20, and the battery cell film group 20 covered by the heat-shrinkable film 30 is accommodated in the accommodating cavity 16. The heat shrinkable film 30 is provided with a first through hole 31 corresponding to the pressure relief groove 130. Based on the thermal shrinkage property of the heat shrinkable film, the cell module 20 is tightly wrapped by the heat shrinkable film 20.

The first buffer layer 40 is located between the heat shrinkable film 30 and the lower cover 13. The first buffer layer 40 is provided with a second through hole 41, and the second through hole 41 communicates with the first through hole 31 and the pressure relief groove 130.

In this embodiment, the first buffer layer 40 may be, but is not limited to, foam.

The second buffer layer 50 is disposed around the cell module 20 and is located between the heat shrinkable film 30 and the side plate 15.

In this embodiment, the second buffer layer 50 can be, but is not limited to, foam. The second buffer layer 50 includes a first part 51, a second part 52, a third part 53, and a fourth part 54 surrounding the battery module 20 in sequence. The first part 51, the second part 52, the third part 53, and the fourth part 54 are arranged independently of each other. In some embodiments, the first part 51, the second part 52, the third part 53, and the fourth part 54 are integrally arranged, so that the second buffer layer 50 is sleeved on the electric The core module 20 is on.

The glue layer 60 is poured between the shell 10 and the second buffer layer 50. The buffer layer 50 resists the cell module 20 under the squeeze of the adhesive layer 60, thereby fixing the cell module 20 in the housing 10.

Referring to FIG. 3, FIG. 5 and FIG. 6, the battery structure 100 may further include a third buffer layer 70. The third buffer layer 70 is located between the heat shrinkable film 30 and the bottom of the battery cell module 20 facing the lower cover 13. Wherein, the third buffer layer 70 has an opening 71 corresponding to the first through hole 31. The opening 71 communicates with the cell module 20 and the first through hole 31.

In some embodiments, the surface of the third buffer layer 70 facing away from the lower cover 13 is provided with a groove 73, and the groove 73 is in communication with the second through hole 41. In this embodiment, the groove 73 communicates with the second through hole 41 through the opening 71. In some embodiments, the groove 73 extends to the outer periphery 701 of the third buffer layer 70 (that is, passes through the outer periphery 701 of the third buffer layer 70) to facilitate communication with the battery module 20 The side wall 201 facilitates exhaust.

In some embodiments, the cell module 20 may include a plurality of stacked cell units 21, wherein the stacking direction of the plurality of cell units 21 is parallel to the lower cover 13 toward the cell unit 21 surface. At this time, the side wall of each cell unit 21 is connected to the groove 73, so as to facilitate exhaust. Preferably, the groove 73 is opened along the stacking direction and communicates with the opening 71.

The number of the groove 73 can be one or more. When there are multiple grooves 73, the arrangement directions of the multiple grooves 73 may be different.

In some embodiments, referring to FIG. 3, FIG. 4 and FIG. 5, the battery structure 100 may further include a fourth buffer layer 80. The fourth buffer layer 80 is located between the heat shrinkable film 30 and the side wall 201 of the battery module 20 facing the side plate 15, and is disposed corresponding to the two opposite side walls 201 of the battery module 20 . In some embodiments, the fourth buffer layer 80 may also be disposed around the cell module 20.

When the cell module 20 includes a plurality of cell units 21, the fourth buffer layer 80 may also be disposed between two adjacent cell units 21.

In some embodiments, referring to FIG. 5, the surface of the fourth buffer layer 80 facing the cell module 20 or the cell unit 21 may also be provided with an exhaust groove 81 along a direction perpendicular to the third buffer layer 70 . The exhaust groove 81 may communicate with the groove 73, which is more conducive to exhaust of the battery structure.

In some embodiments, referring to FIG. 2, the battery structure 100 may further include a pressure relief valve 90 installed in the pressure relief groove 130 to control the battery structure 100 to discharge outward. gas.

In some embodiments, referring to FIG. 2, the battery structure 100 may further include a sealing ring 95, which is disposed between the upper cover 11 and the side plate 15 to avoid any damage in the battery structure 100 The gas is removed from the connection between the upper cover 11 and the side plate 15, which facilitates the directional discharge of gas inside the battery structure 100.

In the battery structure 100 of the present application, the battery cell module 20 is covered by a heat shrinkable film 30 to prevent the glue layer 60 from contacting the battery cell module 20 when the glue layer 60 is formed by pouring glue, thereby facilitating the subsequent battery structure The disassembly of the battery can reduce the damage to the battery module 20. Secondly, the gas produced by the cell module 20 is guided by the heat shrinkable film 30, and the first through hole on the heat shrinkable film 30 communicates with the pressure relief groove through the second through hole on the first buffer layer, thereby realizing the internal The directional discharge of high-pressure gas avoids the deformation of the battery structure, thereby prolonging the service life of the battery structure and the battery cell module 20.

In addition, for those of ordinary skill in the art, various other corresponding changes and modifications can be made according to the technical concept of the present application, and all these changes and modifications should fall within the protection scope of the present application.

Claims

A battery structure, characterized in that it comprises:

The housing includes an upper cover, a lower cover, and a side plate connecting the upper cover and the lower cover. The upper cover, the lower cover, and the side plate are surrounded to form an accommodating cavity, and the lower cover is provided with There is a pressure relief groove communicating with the accommodating cavity;

The battery cell module is housed in the accommodating cavity;

A heat shrinkable film covering the battery cell module, and the heat shrinkable film is provided with a first through hole corresponding to the pressure relief groove;

The first buffer layer is located between the heat shrinkable film and the lower cover, and the first buffer layer is provided with a second through hole, and the second through hole communicates with the first through hole and the leak Pressure groove

A second buffer layer, which surrounds the cell module and is located between the heat shrinkable film and the side plate; and

The glue layer is poured between the shell and the second buffer layer.
The battery structure of claim 1, wherein the battery structure further comprises a third buffer layer, and the third buffer layer is located between the heat shrinkable film and the battery cell module facing the lower cover Between the bottoms, and the third buffer layer has openings corresponding to the first through holes.
3. The battery structure of claim 2, wherein the third buffer layer is provided with a groove on a surface facing away from the lower cover, and the groove is in communication with the second through hole.
3. The battery structure according to claim 2, wherein the battery cell module includes a plurality of stacked battery cell units, and the stacking direction of the battery cell units is parallel to the lower cover.
5. The battery structure according to claim 4, wherein the surface of the third buffer layer facing away from the lower cover is provided with a groove along the stacking direction, and the groove is communicated with the second through hole.
The battery structure of claim 2, wherein the battery structure further comprises a fourth buffer layer, and the fourth buffer layer is located between the heat shrinkable film and the battery cell module facing the side plate Between the side walls.
7. The battery structure according to claim 6, wherein the fourth buffer layer is further disposed between the adjacent battery cell units.
8. The battery structure according to claim 6 or 7, wherein the fourth buffer layer is provided with exhaust grooves along a direction perpendicular to the third buffer layer.
The battery structure of claim 1, wherein the first buffer layer and the second buffer layer are foam.
The battery structure according to claim 3 or 5, wherein the groove penetrates the outer periphery of the first buffer layer.