CN-122000583-A - Battery cell, battery device and electricity utilization device

Abstract

The application discloses a battery cell, a battery device and an electricity utilization device. The housing includes a shell having an opening and a first wall connected to the shell and closing the opening. The electrode assembly is disposed within the housing. The first wall comprises a body and a connecting part, the connecting part is arranged on the periphery of the body, the connecting part protrudes out of the body and is connected with the shell along the direction of the electrode assembly pointing to the first wall. The technical scheme provided by the application can effectively improve the reliability of the battery device.

Inventors

• CAO MENGKAI
• ZHOU WENLIN
• LI CAN
• ZHENG YULIAN
• WU YU
• WANG PENG

Assignees

• 宁德时代新能源科技股份有限公司

Dates

Publication Date

20260508

Application Date

20241105

Claims (20)

1. 1. A battery cell, comprising: a housing comprising a shell having an opening and a first wall connected to the shell and closing the opening; An electrode assembly disposed within the housing; the first wall comprises a body and a connecting part, the connecting part is arranged on the periphery of the body, the electrode assembly points to the direction of the first wall, and the connecting part protrudes out of the body and is connected with the shell.
2. 2. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, Along the thickness direction of the first wall, the connecting part is provided with a first surface facing the electrode assembly, the body is provided with a second surface facing the electrode assembly, and the first surface protrudes from the second surface by h, so that h is more than or equal to 0.1mm and less than or equal to 10mm.
3. 3. The battery cell of claim 2, wherein the battery cell comprises a plurality of cells, Meets the requirements of less than or equal to 0.5mm h is less than or equal to 5mm.
4. 4. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, And along the thickness direction of the first wall, the thickness of the connecting part is t, and t is more than or equal to 0.5mm and less than or equal to 10mm.
5. 5. The battery cell of claim 4, wherein the battery cell comprises a plurality of cells, Meets the requirement of less than or equal to 1mm t is less than or equal to 8mm.
6. 6. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The electrode assembly includes a pole piece having a flat region arranged in a stacked manner along a first direction perpendicular to a thickness direction of the first wall; The flat region of the outermost layer of the electrode assembly has a third surface facing the first wall in the thickness direction of the first wall along the first direction, the connecting portion has a first surface facing the electrode assembly in the thickness direction of the first wall, and a distance between the third surface and the first surface is H, satisfying 2mm < H < 20mm.
7. 7. The battery cell of claim 6, wherein the battery cell comprises a plurality of cells, Meets the requirements of less than or equal to 3mm H is less than or equal to 15mm.
8. 8. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The connection part has a first surface facing the electrode assembly in a thickness direction of the first wall, the body has a second surface facing the electrode assembly, and the body has a fourth surface connecting the first surface and the second surface in a radial direction of the first wall, the fourth surface being spaced apart from an inner wall surface of the case.
9. 9. The battery cell of claim 8, wherein the battery cell comprises a plurality of cells, Along the radial direction of the first wall, the distance between the fourth surface and the inner wall surface of the shell is J, and J is more than or equal to 0.1mm and less than or equal to 20mm.
10. 10. The battery cell of claim 9, wherein the battery cell comprises a plurality of cells, Meets the requirements of less than or equal to 0.5mm J is less than or equal to 10mm.
11. 11. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The connecting portion is connected with the shell through a first combining portion, the outer peripheral surface of the connecting portion is in contact with the inner wall surface of the shell, and the first combining portion is located between the outer peripheral surface of the connecting portion and the inner wall surface of the shell.
12. 12. The battery cell of claim 11, wherein the battery cell comprises a plurality of cells, The first bonding portion includes a first solder mark formed between the connection portion and the housing.
13. 13. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The connecting part is connected with the case through a second coupling part, a flange is provided at the outer circumference of the connecting part, one side of the flange facing the electrode assembly is in contact with the end surface of the case in the thickness direction of the first wall, and the second coupling part is located between the flange and the end surface of the case.
14. 14. The battery cell of claim 13, wherein the battery cell comprises a plurality of cells, The second bond includes a second weld formed between the flange and the housing.
15. 15. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The connecting part and the body are integrally formed.
16. 16. The battery cell of claim 15, wherein the battery cell comprises a plurality of cells, The first wall is recessed at a position corresponding to the body and facing away from one side of the electrode assembly in a thickness direction of the first wall to form the body and the connection part.
17. 17. The battery cell of any one of claims 1-16, wherein the cell comprises a plurality of cells, The battery cell further includes an electrode terminal disposed in the body and electrically connected with the electrode assembly.
18. 18. The battery cell of claim 17, wherein the battery cell comprises a plurality of cells, Along the thickness direction of the first wall, one side of the electrode terminal, which faces away from the electrode assembly, is flush with one side of the connecting part, which faces away from the electrode assembly.
19. 19. The battery cell of claim 17, wherein the battery cell comprises a plurality of cells, The electrode terminal is protruded from one side of the connecting part, which is away from the electrode assembly, along the direction in which the first wall is directed toward the electrode assembly, or is protruded from one side of the connecting part, which is away from the electrode assembly, along the direction in which the electrode assembly is directed toward the first wall.
20. 20. The battery cell of claim 1, wherein the battery cell comprises a plurality of cells, The shell is an aluminum shell.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device and an electric device. Background Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles. In the development of battery technology, how to improve the reliability of a battery device is a technical problem that needs to be solved in battery technology. Disclosure of Invention The application provides a battery monomer, a battery device and an electricity utilization device, the technical scheme provided by the application can effectively improve the reliability of the battery device. In a first aspect, some embodiments of the present application provide a battery cell including a housing and an electrode assembly. The housing includes a shell having an opening and a first wall connected to the shell and closing the opening. The electrode assembly is disposed within the housing. The first wall comprises a body and a connecting part, the connecting part is arranged on the periphery of the body, the connecting part protrudes out of the body and is connected with the shell along the direction of the electrode assembly pointing to the first wall. According to the battery cell provided by the embodiment, the connecting part is convexly arranged along the direction of the electrode assembly to the first wall through the periphery of the body of the first wall, the connecting part is connected with the shell, the distance between the connecting part between the first wall and the shell and the electrode assembly can be increased, the expansion degree of the electrode assembly is certain, namely, the deformation of the electrode assembly is small, the deformation opening angle between the connecting part between the first wall and the shell and the electrode assembly is reduced, so that the strain is reduced, the degree of stress concentration is reduced, the problem that the fatigue cracking occurs due to the fact that the number of charge and discharge cycles of the battery cell is increased, the electrode assembly is expanded, and the connecting part between the first wall and the shell is too close to the electrode assembly due to the fact that the stress concentration occurs at the connecting part between the first wall and the shell can be effectively improved, the reliability of the battery cell is high, and the reliability of the battery cell is high. According to some embodiments of the application, the connecting portion has a first surface facing the electrode assembly in a thickness direction of the first wall, and the body has a second surface facing the electrode assembly, the first surface protruding from the second surface by a dimension h satisfying 0.1 mm≤h≤10 mm. In the above scheme, on one hand, the distance between the connecting part between the first wall and the shell and the electrode assembly can be effectively increased by setting the dimension h of the first surface protruding from the second surface to be not less than 0.1mm along the direction of the electrode assembly to the first wall, so that the problem that the connecting part between the first wall and the shell is cracked due to expansion of the electrode assembly is solved, the reliability of the battery cell is high, and the reliability of the battery device is further high, and on the other hand, the influence on the whole volume of the battery cell due to the protruding connecting part can be avoided to a certain extent by setting the dimension h of the first surface protruding from the second surface to be not more than 10mm, so that the battery cell has higher volume energy density, and further the battery device has higher volume energy density. According to some embodiments of the application, 0.5 mm≤h≤5 mm is satisfied. In the above scheme, on one hand, the distance between the connecting part between the first wall and the shell and the electrode assembly can be further increased by setting the dimension h of the first surface protruding from the second surface to be not less than 0.5mm along the direction of the electrode assembly to the first wall, so that the problem that the connecting part between the first wall and the shell cracks due to expansion of the electrode assembly is effectively solved, the reliability of the battery cell is high, and further the reliability of the battery device is high, on the other hand, the influence on the whole volume of the battery cell caused by the fact that the protruding connecting part is arranged can be effectively reduced by sett