CN219286538U

CN219286538U - Battery cell, battery module and vehicle

Info

Publication number: CN219286538U
Application number: CN202320067670.XU
Authority: CN
Inventors: 赵芬芬; 鲁海旭; 张雷; 赵赫; 黄利明
Original assignee: Hubei Eve Power Co Ltd
Current assignee: Hubei Eve Power Co Ltd
Priority date: 2023-01-10
Filing date: 2023-01-10
Publication date: 2023-06-30
Anticipated expiration: 2033-01-10

Abstract

The utility model belongs to the technical field of electric cores, and discloses an electric core, a battery module and a vehicle, wherein the electric core comprises an electric core main body, an electric core shell and an electric core cover plate, the electric core main body is connected with the electric core cover plate, the electric core shell comprises a main shell and a connecting structure, the main shell is provided with a containing cavity for installing the electric core main body, the connecting structure is arranged at the end part of the main shell, the inner wall of the connecting structure is used for being welded with the side wall of the electric core cover plate, and the inner wall of the connecting structure or the side wall of the electric core cover plate is provided with a groove, so that heat and gas generated by welding can be guided to other parts through the groove in the welding process, so that the heat and the gas can be dissipated in time and cannot be gathered on the surfaces of the electric core cover plate and the connecting structure, the explosion welding is avoided, and the welding effect is improved.

Description

Battery cell, battery module and vehicle

Technical Field

The utility model relates to the technical field of battery cells, in particular to a battery cell, a battery module and a vehicle.

Background

In order to improve the assembly efficiency of the lithium ion battery and simplify the structure, in the assembly process of the lithium ion battery, a battery cell cover plate is usually welded to a shell to complete connection. The laser welding is applied to the welding process of the battery cell cover plate and the shell due to the high-efficiency and precision characteristics.

The traditional battery cell cover plate is tightly matched with the shell so as to be convenient for welding, but a large amount of heat and gas can be generated in the laser welding process, the battery cell cover plate is tightly attached to the shell, so that the heat and the gas cannot be dissipated, and the heat and the gas are accumulated on the surfaces of the battery cell cover plate and the shell, so that the explosion welding is caused.

Disclosure of Invention

According to one aspect of the utility model, the utility model provides an electric core cover plate and a shell, so as to solve the problems that heat and gas generated by laser welding cannot be dissipated and gather on the surfaces of the electric core cover plate and the shell when the electric core cover plate and the shell are welded in the prior art, and further the explosion welding is caused.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the battery cell comprises a battery cell main body, a battery cell shell and a battery cell cover plate, wherein the battery cell main body is connected with the battery cell cover plate; the cell housing includes:

a main housing having a receiving cavity for mounting the cell main body;

the connecting structure is arranged at the end part of the main shell, and the inner wall of the connecting structure is used for being welded with the side wall of the battery cell cover plate; the inner wall of the connecting structure or the side wall of the battery cell cover plate is provided with a groove.

As the preferred scheme of electric core, the recess sets up in connection structure's inner wall.

As the preferred scheme of electric core, connection structure including set up in the installation department of the tip of main shell and protruding locate the welding portion of installation department inner wall, the recess is seted up in the inner wall of welding portion.

As the preferred scheme of electric core, connection structure has seted up a plurality of the recess, a plurality of the recess is followed the length direction of main shell sets gradually.

As the preferred scheme of electric core, the electric core is cylinder electric core, main shell with connection structure all is cyclic annular, the central line of recess is cyclic annular or is the spiral.

As the preferred scheme of electric core, connection structure has seted up the intercommunicating pore, the one end of intercommunicating pore with the recess intercommunication, the other end and outside air intercommunication.

As a preferred scheme of the battery cell, the battery cell shell is provided with openings, the connecting structure can be connected with the battery cell cover plate so as to close the openings, and the number of the openings is one.

As the preferred scheme of electric core, electric core apron include the top cap piece and connect in the plastic part of top cap piece, the top cap piece with connection structure's inner wall welding, the plastic part is used for the utmost point post to pass, the top cap piece with plastic part passes through inserts injection molding integrated into one piece.

According to another aspect of the present utility model, there is provided a battery module including the above-described battery cell.

According to still another aspect of the present utility model, there is provided a vehicle including the above battery module.

The beneficial effects of the utility model are as follows:

the utility model provides a battery cell, which comprises a battery cell main body, a battery cell shell and a battery cell cover plate, wherein the battery cell main body is connected with the battery cell cover plate, the battery cell shell comprises a main shell and a connecting structure, the main shell is provided with a containing cavity, the containing cavity is used for installing the battery cell main body, the connecting structure is arranged at the end part of the main shell, the inner wall of the connecting structure is used for being welded with the side wall of the battery cell cover plate, and the inner wall of the connecting structure or the side wall of the battery cell cover plate is provided with a groove, so that heat and gas generated by welding can be guided to other parts through the groove in the welding process, so that the heat and the gas can be dissipated in time and cannot be gathered on the surfaces of the battery cell cover plate and the connecting structure, the explosion welding is avoided, and the welding effect is improved.

The utility model also provides a battery module, which comprises the battery cell, wherein heat and gas generated by welding can be guided to other parts through the grooves in the welding process of the battery shell of the battery cell and the battery cell cover plate, so that the explosion welding is avoided, and the safety of the battery module during assembly is improved.

The utility model further provides a vehicle comprising the battery module, and the battery module is good in safety.

Drawings

FIG. 1 is a schematic diagram of a cell in an embodiment of the present utility model;

fig. 2 is a schematic diagram of a portion of a cell according to an embodiment of the present utility model.

In the figure:

100. a cell housing; 101. an opening; 110. a main housing; 120. a connection structure; 121. a mounting part; 122. a welding part;

200. a groove;

300. a cell cover plate; 310. a top cover sheet; 320. a plastic part;

400. a pole.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

In order to improve the assembly efficiency of the lithium ion battery and simplify the structure, in the assembly process of the lithium ion battery, a battery cell cover plate is usually welded to a shell to complete connection. The traditional battery cell cover plate is tightly matched with the shell so as to be convenient for welding, but a large amount of heat and gas can be generated in the laser welding process, the battery cell cover plate is tightly attached to the shell, so that the heat and the gas cannot be dissipated, and the heat and the gas are accumulated on the surfaces of the battery cell cover plate and the shell, so that the explosion welding is caused.

Aiming at the problems, the embodiment provides the battery cell, so that the problems that heat and gas generated by laser welding cannot be dissipated and gather on the surfaces of the battery cell cover plate and the shell when the battery cell cover plate and the shell are welded, and then the explosion welding is caused in the prior art are solved, and the battery cell can be used in the technical field of battery cells.

Fig. 1 shows a schematic structural diagram of a battery cell according to an embodiment of the present utility model; fig. 2 is a schematic diagram showing a part of the structure of a battery cell according to an embodiment of the utility model. Referring to fig. 1-2, the battery cell includes a battery cell body, a battery cell case 100, and a battery cell cover 300, the battery cell body being connected to the battery cell cover 300. The cell case 100 includes a main case 110 and a connection structure 120, the main case 110 having a receiving cavity for mounting a cell body. The connection structure 120 is arranged at the end part of the main shell 110, the inner wall of the connection structure 120 is used for being welded with the side wall of the battery cell cover plate 300, the inner wall of the connection structure 120 or the side wall of the battery cell cover plate 300 is provided with the groove 200, so that heat and gas generated by welding can be guided to other parts through the groove 200 in the welding process, so that the heat and the gas can be dissipated in time and cannot be accumulated on the surfaces of the battery cell cover plate 300 and the connection structure 120, the explosion welding is avoided, and the welding effect is improved. The end surface of the connection structure 120 can be abutted against the battery cell cover plate 300, so that the assembled connection structure 120 is tightly attached to the battery cell cover plate 300, and the stability of the assembled structure is improved. Alternatively, the main case 110 is made of an aluminum material.

In some embodiments, the grooves 200 may be formed on the side wall of the cell cover 300, but the structure of the cell cover 300 is complex relative to the cell housing 100, and the positioning of the grooves 200 on the cell cover 300 may increase the processing difficulty. Thus, in the present embodiment, the groove 200 is formed on the inner wall of the connection structure 120.

With continued reference to fig. 1-2, the connection structure 120 includes a mounting portion 121 provided at an end portion of the main case 110 and a welding portion 122 protruding from an inner wall of the mounting portion 121, and the groove 200 is formed in an inner wall of the welding portion 122. By convexly arranging the welding part 122 on the inner wall of the mounting part 121, on one hand, the welding operation can be convenient, and meanwhile, the influence of high temperature generated during welding on the surface structure of the main shell 110 is avoided; the thickness of the connection structure 120 can be increased in the other direction, so that the shape of the connection structure is prevented from being changed during welding, and the welding effect is prevented from being influenced.

With continued reference to fig. 1-2, the connection structure 120 is provided with a plurality of grooves 200, and the plurality of grooves 200 are sequentially disposed along the length direction of the main housing 110, so that the guiding effect of heat and high-temperature gas generated during welding can be further improved by disposing the plurality of grooves 200, thereby further improving the anti-explosion effect.

With continued reference to fig. 1-2, the battery core is a cylindrical battery core, the main casing 110 and the connection structure 120 are all annular, the central line of the groove 200 is annular or spiral, preferably spiral, and the spiral groove 200 is convenient for discharging gas and guiding heat, so that the explosion-proof welding effect can be effectively improved.

With continued reference to fig. 1-2, in order to further enhance the guiding effect of heat and hot gas, in this embodiment, the connection structure 120 is provided with a communication hole, one end of which is communicated with the groove 200, and the other end of which is communicated with the outside air, and the hot gas accumulated in the groove 200 can be discharged through the communication hole.

With continued reference to fig. 1-2, the cell housing 100 has openings 101, and the connection structure 120 can be connected with the cell cover 300 to close the openings 101, with the number of openings 101 being one. Generally, the opening 101 is disposed at the upper end of the cell housing 100, and the lower end is closed, so as to avoid leakage at the lower end, and in addition, when the cell cover 300 closes the opening 101, the potential leakage risk of the conventional assembly form of the riveting structure can be avoided.

With continued reference to fig. 1-2, the battery cell cover plate 300 includes a top cover plate 310 and a plastic part 320 connected to the top cover plate 310, the top cover plate 310 is welded to the inner wall of the connection structure 120, the plastic part 320 is used for the pole 400 to pass through, and the top cover plate 310 and the plastic part 320 are integrally formed by insert injection molding, so that the structure and the assembly process of the battery cell cover plate 300 are simplified, and meanwhile, the top cover plate 310 and the plastic part 320 are integrally formed, so that the sealing performance of the battery cell can be further improved, and leakage is prevented.

The embodiment also provides a battery module, including the above-mentioned electric core, in the welding process of the battery shell 100 and the electric core cover plate 300 of this electric core, heat and gas generated by welding can be guided to other positions through the groove 200, thereby avoiding the explosion welding, and improving the safety of this battery module when assembling.

The embodiment also provides a vehicle, comprising the battery module, and the battery module is good in safety.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims

1. The battery cell comprises a battery cell main body, a battery cell shell (100) and a battery cell cover plate (300), wherein the battery cell main body is connected with the battery cell cover plate (300); the battery cell housing (100) is characterized by comprising:

a main housing (110) having a receiving cavity for mounting the cell body;

the connecting structure (120) is arranged at the end part of the main shell (110), and the inner wall of the connecting structure (120) is used for being welded with the side wall of the battery cell cover plate (300); the inner wall of the connecting structure (120) or the side wall of the battery cell cover plate (300) is provided with a groove (200).

2. The cell of claim 1, wherein the recess (200) is open to an inner wall of the connection structure (120).

3. The battery cell according to claim 2, wherein the connection structure (120) comprises a mounting portion (121) disposed at an end portion of the main case (110) and a welding portion (122) protruding from an inner wall of the mounting portion (121), and the groove (200) is opened in an inner wall of the welding portion (122).

4. A cell according to claim 2 or 3, wherein the connection structure (120) is provided with a plurality of grooves (200), and the plurality of grooves (200) are sequentially arranged along the length direction of the main casing (110).

5. A cell according to claim 2 or 3, characterized in that the cell is a cylindrical cell, the main housing (110) and the connection structure (120) are both annular, and the centre line of the recess (200) is annular or spiral.

6. A cell according to claim 2 or 3, wherein the connection structure (120) is provided with a communication hole, one end of which is in communication with the recess (200) and the other end of which is in communication with the outside air.

7. A cell according to any of claims 1-3, characterized in that the cell housing (100) has openings (101), the connection structure (120) being connectable with the cell cover (300) to close the openings (101), the number of openings (101) being one.

8. A cell according to any of claims 1-3, wherein the cell cover plate (300) comprises a top cover plate (310) and a plastic part (320) connected to the top cover plate (310), the top cover plate (310) is welded to the inner wall of the connecting structure (120), the plastic part (320) is used for passing through a pole (400), and the top cover plate (310) and the plastic part (320) are integrally formed by insert injection molding.

9. Battery module, characterized in that it comprises an electrical cell according to any of claims 1-8.

10. A vehicle comprising the battery module according to claim 9.