CN219040659U

CN219040659U - Battery with explosion-proof structure

Info

Publication number: CN219040659U
Application number: CN202223429066.1U
Authority: CN
Inventors: 陈秀忠
Original assignee: Suzhou Chuangneng New Energy Industrial Co ltd
Current assignee: Suzhou Chuangneng New Energy Industrial Co ltd
Priority date: 2022-12-21
Filing date: 2022-12-21
Publication date: 2023-05-16
Anticipated expiration: 2032-12-21

Abstract

The utility model discloses a battery with an explosion-proof structure, which relates to the technical field of power batteries and comprises: the battery shell is of an integrated structure, the battery shell is provided with an explosion-proof valve and at least one welding part which are integrated, and the welding part is arranged along the circumferential direction of the end part of the battery shell; the battery cell is arranged on the inner side of the battery shell and welded with a welding part at the bottom of the battery shell by adopting a penetration welding method; the battery shell comprises an outer shell body and a bottom cover, wherein the explosion-proof valve and at least one welding part are arranged on the bottom cover, the middle of the bottom cover is inwards sunken to form the explosion-proof valve, the bottom cover is inwards sunken to form the welding part along the circumferential direction, and the welding part is arranged around the explosion-proof valve. According to the utility model, the battery shell is of an integrated structure, the outer shell, the bottom cover and the explosion-proof valve are integrally designed, so that the die opening cost is saved, the explosion-proof valve is not required to be welded on the bottom cover in an opening way, the mounting process of the battery shell can be simplified, and the processing cost of the battery shell can be reduced.

Description

Battery with explosion-proof structure

Technical Field

The utility model relates to the technical field of power batteries, in particular to a battery with an explosion-proof structure.

Background

The power battery is used as an energy supply device of the electric automobile and is one of important components of the electric automobile. The power battery is applied to the electric automobile very frequently, and in consideration of safety when the battery is used, the explosion-proof valve is generally installed on the shell of the power battery, and if the inside of the battery is in case of a problem, the pressure in the battery can be automatically relieved through the explosion-proof valve, so that the pressure in the battery is reduced, and the explosion of the battery is prevented.

The housing of the power cells currently in use is generally composed of three parts: the shell body, the top cover and the bottom cover are not integrally formed, the shell body, the top cover and the bottom cover are welded together during assembly, then a mounting hole is formed in the middle of the top cover, the explosion-proof valve assembly is mounted in the mounting hole, and the top cover faces upwards due to the fact that the bottom cover faces downwards during mounting of the battery, so that pressure in the battery is relieved through the explosion-proof valve on the top cover once the internal pressure of the battery is overlarge, the explosion-proof valve can burst into the interior of an automobile when the explosion-proof valve bursts upwards, and therefore a certain potential safety hazard exists.

The explosion-proof valve assembly generally needs to be welded on the top cover, then the top cover and the shell are welded together, then the battery cell is assembled inside the shell, the battery cell is welded with the top cover, finally the bottom cover is welded with the shell, and the battery cell is sealed in the shell, and due to the limitation of the structure, the following problems still exist:

firstly, because all the structures are split structures, each structure needs to be independently subjected to die opening processing, and the die opening cost is increased;

and the top cover and the bottom cover are separately welded with the shell, so that the requirement on the whole tightness of the structure is higher, the welding technology is higher, and the welding type explosion-proof valve can increase the whole processing cost of the battery shell.

Disclosure of Invention

The utility model aims to solve the problems, and designs a battery with an explosion-proof structure, and the assembling difficulty and the processing cost of the battery are reduced by integrally designing an explosion-proof valve, an outer shell and a bottom cover.

The technical scheme of the utility model for achieving the purpose is that the battery with the explosion-proof structure comprises:

the battery shell is of an integrated structure, the battery shell is provided with an explosion-proof valve and at least one welding part which are integrated, and the welding part is arranged along the circumferential direction of the end part of the battery shell;

the battery cell is arranged on the inner side of the battery shell and welded with a welding part at the bottom of the battery shell by adopting a penetration welding method;

the top cover is arranged at the top of the battery shell and seals the battery cell in the battery shell;

the battery case comprises an outer case body and a bottom cover, the explosion-proof valve and at least one welding part are arranged on the bottom cover, the middle of the bottom cover is inwards sunken to form the explosion-proof valve, the bottom cover is inwards sunken to form the welding part along the circumferential direction, and the welding part is arranged around the explosion-proof valve.

Preferably, the bottom cover includes a body portion and an extension portion located in the middle of the body portion and protruding upward, the explosion-proof valve is disposed in the middle of the extension portion, and at least one of the welding portions is disposed along a circumferential direction of the body portion.

Preferably, a containing space for containing electrolyte is arranged between the extension part and the battery cell.

Preferably, a round hole which is axially communicated with the accommodating space and is positioned on the same central axis as the explosion-proof valve is formed in the middle of the battery cell.

Preferably, an adapter plate is arranged between the battery cell and the bottom cover, the upper surface and the lower surface of the adapter plate are welded with the welding part and the battery cell respectively by adopting a penetration welding method, and a through hole is formed in the middle of the adapter plate.

Preferably, the explosion-proof valve is circular.

Preferably, the welding parts are provided with two or more, and the two or more welding parts are distributed in an annular array along the circumferential direction of the explosion-proof valve.

Preferably, the bottom cover faces the ground.

Compared with the prior art, the beneficial effects are that:

according to the utility model, the battery shell is of an integrated structure, the outer shell and the bottom cover are integrally designed, the die opening cost is saved, the explosion-proof valve and the bottom cover are integrally designed, the explosion-proof valve is not required to be welded on the bottom cover in an opening mode, the mounting process of the battery shell can be simplified, the processing cost of the battery shell can be reduced, the welding part on the bottom cover is welded with the battery core in a penetration welding mode, the whole end face of the battery core is not required to be welded with the bottom cover, the welding area between the battery core and the bottom cover is reduced, the welding cost is reduced under the condition that the structural strength is ensured, and the whole assembly difficulty of the battery is greatly reduced.

Drawings

Fig. 1 is a partially cross-sectional structural schematic view of a battery case of embodiment 1;

FIG. 2 is a schematic cross-sectional structure of embodiment 1;

FIG. 3 is a schematic overall structure of embodiment 1;

fig. 4 is a schematic plan view of the bottom cover in embodiment 1;

FIG. 5 is a schematic cross-sectional structure of embodiment 2;

fig. 6 and 7 are schematic views of two planar structures of the bottom cover of embodiment 3.

In the figure, 1, a battery case; 11. a bottom cover; 111. a body portion; 1111. a welding part; 112. an extension; 1121. an explosion-proof valve; 101. an accommodating space; 12. an outer housing; 2. a top cover; 3. a battery cell; 31. a round hole; 4. and the adapter plate.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

As shown in fig. 1-3, embodiment 1 of the present utility model proposes a battery with an explosion-proof structure, which mainly includes three parts, namely a battery case 1, a battery cell 3, and a top cover 2, wherein the battery cell 3 is disposed in the battery case 1, the top cover 2 is disposed at the top end of the battery case 1, the battery cell 3 is sealed in the battery case 1, the position of the top cover 2 is a negative electrode, and the battery case 1 is of an integrated structural design, and includes two parts: the outer shell 12 and the bottom cover 11, the positive electrode at the position of the bottom cover 11, the outer shell 12 and the bottom cover 11 are integrally designed, and only one die is required to be opened during die opening, so that separate and independent die opening processing of the outer shell 12 and the bottom cover 11 is not required as in the prior art, and the die opening cost can be reduced.

As shown in fig. 1 and 3, the explosion-proof valve 1121 and at least one welding portion 1111 are integrally formed on the bottom cover 11, and the bottom cover 11 is composed of two parts, including a body portion 111 and an extension portion 112 located in the middle of the body portion 111 and formed by extending upward to protrude, wherein the welding portion 1111 is located on the body portion 111, and when the explosion-proof valve 1121 is located on the extension portion 112, for example, the welding portion 1111 is one, the welding portion 1111 is formed by being recessed inward along the circumferential direction of the body portion 111, and is formed into a ring shape, and then the ring-shaped recess is formed by being recessed inward, and then the welding portion 1111 is formed, that is, the position of the welding portion 1111 is thinner than the other positions of the bottom cover 11.

The explosion-proof valve 1121 is also integrally formed, the explosion-proof valve 1121 is preferably circular and is formed by recessing inwards along the middle of the extension 112, so that the position of the explosion-proof valve 1121 is thinner than other parts of the bottom cover 11, the pressure born by the explosion-proof valve 1121 is generally 1.0-1.5MPa, and the explosion-proof valve 1121 is automatically broken beyond the pressure, thereby decompressing the inside of the battery, preventing the explosion of the battery, improving the safety of the battery in use, simplifying the structure compared with the prior art, not only saving the step of installing the explosion-proof valve 1121, but also ensuring the sealing performance due to the integral structural design, and avoiding the problem that the problem of the sealing performance of the whole battery possibly occurs due to the problem of the welding process when the explosion-proof valve 1121 is installed, so that once the explosion-proof valve 1121 is broken, the impact caused by the breakage is oriented to the chassis of the automobile instead of being oriented to the inside of the automobile, thereby improving the safety of the battery in use.

As shown in fig. 1 and 3, a containing space 101 for containing electrolyte is provided between the extension 112 and the cell 3, and meanwhile, a circular hole 31 is provided in the middle of the cell 3, which is axially penetrated, and the circular hole 31 is communicated with the containing space 101 and is located on the same central axis as the explosion-proof valve 1121, so that the pressure in the battery is concentrated in the containing space 101, and when the pressure is high to a certain extent, the explosion-proof valve 1121 is expanded and broken, thereby decompressing the battery.

As shown in fig. 5, embodiment 2 is different from embodiment 1 in that an adapter plate 4 is disposed between the battery cell 3 and the bottom cover 11, if there is a processing error in the internal dimension of the battery case 1, only the upper and lower surfaces of the adapter plate need to be welded with the welding portion 1111 on the bottom cover 11 and the battery cell 3 respectively by penetration welding, and a through hole is formed in the middle of the adapter plate 4, so that the round hole 31 on the battery cell 3 can be communicated with the accommodating space 101.

As shown in fig. 6 and 7, in embodiment 3, if the number of the welding portions 1111 is two or more, the shape of the welding portions 1111 is circular arc, which is equivalent to cutting the original circular welding portion 1111 into a small circular arc, and the circular arc welding portions 1111 are distributed in a circular array along the circumferential direction of the explosion-proof valve 1121, so that the welding area between the bottom cover 11 and the battery cell 3 can be further reduced without changing the structural strength, thereby reducing the welding cost.

The above technical solution only represents the preferred technical solution of the present utility model, and some changes that may be made by those skilled in the art to some parts of the technical solution represent the principles of the present utility model, and the technical solution falls within the scope of the present utility model.

Claims

1. A battery having an explosion-proof structure, comprising:

the battery comprises a battery shell (1), wherein the battery shell (1) is of an integrally formed structure, an integrally formed explosion-proof valve (1121) and at least one welding part (1111) are arranged on the battery shell (1), and the welding part (1111) is arranged along the circumferential direction of the end part of the battery shell (1);

the battery cell (3), the battery cell (3) is arranged on the inner side of the battery shell (1) and welded with a welding part (1111) at the bottom of the battery shell (1) by adopting a penetration welding method;

the top cover (2) is arranged at the top of the battery shell (1), and the battery cell (3) is sealed in the battery shell (1);

the battery case (1) comprises an outer case (12) and a bottom cover (11), wherein the explosion-proof valve (1121) and at least one welding part (1111) are arranged on the bottom cover (11), the middle of the bottom cover (11) is inwards sunken to form the explosion-proof valve (1121), the bottom cover (11) is inwards sunken to form the welding part (1111) along the circumferential direction, and the welding part (1111) is arranged around the explosion-proof valve (1121).

2. The battery with an explosion-proof structure according to claim 1, wherein the bottom cover (11) includes a body portion (111) and an extension portion (112) located in the middle of the body portion (111) and formed to protrude upward, the explosion-proof valve (1121) is provided in the middle of the extension portion (112), and at least one of the welding portions (1111) is provided to be distributed along the circumferential direction of the body portion (111).

3. A battery with explosion-proof structure according to claim 2, characterized in that a receiving space (101) for receiving an electrolyte is provided between the extension (112) and the cell (3).

4. A battery with an explosion-proof structure according to claim 3, wherein a circular hole (31) is formed in the middle of the battery core (3), the circular hole (31) is communicated with the accommodating space (101) and is located on the same central axis as the explosion-proof valve (1121).

5. A battery with an explosion-proof structure according to claim 3, characterized in that an adapter plate (4) is arranged between the battery core (3) and the bottom cover (11), the upper and lower surfaces of the adapter plate (4) are welded with the welding part (1111) and the battery core (3) respectively by adopting a penetration welding method, and a through hole is formed in the middle of the adapter plate (4).

6. The battery having an explosion-proof structure according to claim 1, wherein the explosion-proof valve (1121) is circular.

7. The battery having an explosion-proof structure according to claim 1, wherein the welded portion (1111) is provided with two or more, and the two or more welded portions (1111) are distributed in an annular array along the circumferential direction of the explosion-proof valve (1121).

8. A battery with explosion-proof structure according to claim 1, characterized in that the bottom cover (11) is oriented in the direction of the ground.