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CN-122000559-A - Battery monomer, battery device and electric equipment

CN122000559ACN 122000559 ACN122000559 ACN 122000559ACN-122000559-A

Abstract

The application relates to a battery unit, a battery device and electric equipment, wherein the battery unit comprises a shell, an electrode assembly, a heat-conducting insulating part and a bearing insulating part, the shell comprises a shell and an end cover, the shell is provided with an opening, the end cover is covered on the opening and is limited with the shell to form a containing cavity, the end cover is provided with an electrode terminal, the electrode assembly is arranged in the containing cavity and comprises a tab, the tab is electrically connected with the electrode terminal, the heat-conducting insulating part is wound on the periphery of the electrode assembly and is in heat-conducting connection with the shell, and the bearing insulating part comprises a bearing part, and the bearing part is arranged at one end of the heat-conducting insulating part, which is far away from the electrode terminal and covers the electrode assembly. The application can solve the problem that the performance and the service life of the battery monomer are adversely affected due to the fact that the internal temperature of the battery monomer is too high or too low.

Inventors

  • ZHOU JIAN
  • XIE YONGFENG
  • XING CHENGYOU

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (19)

  1. 1. A battery cell, comprising: The shell comprises a shell body and an end cover, wherein the shell body is provided with an opening, the end cover is covered on the opening and is limited with the shell body to form a containing cavity, and the end cover is provided with an electrode terminal; The electrode assembly is arranged in the accommodating cavity and comprises a tab, and the tab is electrically connected with the electrode terminal; The heat-conducting insulating piece is wound on the periphery of the electrode assembly and is in heat-conducting connection with the shell; The bearing insulator comprises a bearing part, and the bearing part is arranged at one end of the heat conduction insulator, which is away from the electrode terminal, and covers the electrode assembly.
  2. 2. The battery cell of claim 1, wherein the support insulator further comprises two first bends connected to opposite sides of the support, the first bends extending from the support toward the end cap and connected to the end cap, the first bends being located between the thermally conductive insulator and the housing.
  3. 3. The battery cell of claim 2, further comprising an insulator disposed on a side of the end cap facing the electrode assembly, the two first bends being located on either side of the insulator.
  4. 4. The battery cell according to claim 3, wherein the support insulator further comprises two second bent portions disposed opposite to each other, and the two first bent portions and the two second bent portions are wrapped around the outer periphery of the insulator; The second bending part is at least connected with one first bending part.
  5. 5. The battery cell according to claim 4, wherein two of the first bent portions are disposed opposite to each other in a length direction of the electrode assembly, and two of the second bent portions are disposed opposite to each other in a thickness direction of the electrode assembly.
  6. 6. The battery cell of claim 4, wherein the second bend is spaced apart from the support.
  7. 7. The battery cell as recited in claim 1, wherein the thermally conductive insulator is provided with a connecting portion extending toward the end cap, the connecting portion being connected to the end cap.
  8. 8. The battery cell as defined in claim 7, wherein the thermally conductive insulator is formed with a first opening through which the electrode terminal is electrically connected with the tab of the electrode assembly.
  9. 9. The battery cell of claim 8, wherein the connection portion includes an extension segment and a bending segment, the extension segment being connected between the bending segment and the thermally conductive insulator, a side of the bending segment facing away from the thermally conductive insulator being connected to a side of the end cap facing the receiving cavity.
  10. 10. The battery cell according to claim 8, wherein the electrode assembly includes two first side surfaces and two second side surfaces, the two first side surfaces being disposed opposite to each other in a first direction, the two second side surfaces being disposed opposite to each other in a second direction, an area of the first side surfaces being larger than an area of the second side surfaces, the thermally conductive insulator includes two first thermally conductive sheets disposed opposite to each other in the first direction, each of the first thermally conductive sheets being disposed between each of the first side surfaces and the inner wall of the case; At least one of the first heat conductive sheets is provided with the connection portion.
  11. 11. The battery cell as recited in claim 10, wherein the thermally conductive insulator further comprises two second thermally conductive sheets, the two first thermally conductive sheets and the two second thermally conductive sheets being alternately connected to each other to enclose the electrode assembly.
  12. 12. The battery cell according to any one of claims 1 to 11, wherein the battery cell includes two or more of the electrode assemblies and two or more of the heat conductive insulating members, the heat conductive insulating members being disposed in one-to-one correspondence with the electrode assemblies.
  13. 13. The battery cell according to claim 12, wherein a gap is formed between both ends of the thermally conductive insulating member along the circumferential side of the electrode assembly, the gap being located at a side of the electrode assembly disposed corresponding to the thermally conductive insulating member facing the adjacent electrode assembly.
  14. 14. The battery cell of any one of claims 1 to 11, wherein the backup insulator is an integrally formed piece.
  15. 15. The battery cell of any one of claims 1 to 11, wherein the backup insulator encloses a placement space, the thermally conductive insulator being located in the placement space.
  16. 16. The battery cell according to any one of claims 1 to 11, wherein the heat conductive insulating member comprises a heat conductive sheet and an insulating film coating the heat conductive sheet, and the heat conductive sheet has a heat conductivity K satisfying, K being equal to or greater than 500W/(m·k).
  17. 17. The battery cell of claim 16, wherein the thermally conductive sheet comprises graphite or graphene or carbon nanotubes.
  18. 18. A battery device comprising the battery cell of any one of claims 1 to 17.
  19. 19. A powered device comprising a battery cell according to any one of claims 1 to 17 for providing electrical energy, or comprising a battery device according to claim 18 for providing electrical energy.

Description

Battery monomer, battery device and electric equipment Technical Field The application relates to the technical field of batteries, in particular to a battery monomer, a battery device and electric equipment. Background Batteries are widely used in electronic devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like. However, in the actual working process of the battery cell, the service life and performance of the battery cell are adversely affected by too high or too low internal temperature. Disclosure of Invention In view of the above problems, the application provides a battery cell, a battery device and electric equipment, which can enhance the heat conduction capability between an electrode assembly inside the battery cell and the external environment so as to balance the internal temperature of the battery cell, improve the performance and prolong the service life of the battery cell. The application provides a battery unit which comprises a shell, an electrode assembly, a heat-conducting insulating piece and a bearing insulating piece, wherein the shell comprises a shell body and an end cover, the shell body is provided with an opening, the end cover is covered on the opening and is limited with the shell body to form a containing cavity, the end cover is provided with an electrode terminal, the electrode assembly is arranged in the containing cavity and comprises a tab, the tab is electrically connected with the electrode terminal, the heat-conducting insulating piece is wound on the periphery of the electrode assembly and is in heat-conducting connection with the shell, the bearing insulating piece comprises a bearing part, and the bearing part is arranged at one end of the heat-conducting insulating piece, which is far away from the electrode terminal, and covers the electrode assembly. In the scheme of the embodiment of the application, the battery unit comprises a shell, an electrode assembly, a heat conducting insulating piece and a bearing insulating piece, wherein the electrode assembly is positioned in the accommodating cavity, and the shell provides accommodating and protecting functions for the electrode assembly. On one hand, the heat of the electrode assembly and the heat conducting insulating part can be conducted through the heat conducting insulating part by arranging the heat conducting insulating part around the periphery of the electrode assembly, the overall temperature uniformity of the electrode assembly is improved, the heat conducting insulating part is in heat conducting connection with the shell, the heat of the electrode assembly can be conducted to the shell through the heat conducting insulating part to dissipate heat, the heat exchange rate between the electrode main body and the external environment is improved, the internal temperature of the battery cell is balanced, the problem that the performance and the service life of the battery cell are adversely affected due to the fact that the internal temperature of the battery cell is too high or too low is solved, on the other hand, the process that insulating sheets are required to be arranged on the periphery of the electrode assembly in the related art can be omitted after the heat conducting insulating part and the supporting insulating part are arranged, the insulating sheets are made of plastic materials generally, the heat conducting performance is poor, the heat dissipation capacity of the electrode assembly is affected, and after the insulating sheets are omitted, the heat conducting capacity of the heat conducting insulating sheets can be further improved besides the cost of the process is reduced. In some embodiments, the supporting insulating member further includes two first bending portions connected to two sides of the supporting portion, the first bending portions extend from the supporting portion toward the end cover and are connected to the end cover, and the first bending portions are located between the heat conducting insulating member and the housing. In these embodiments, by providing two first bent portions, the electrode assembly and the heat conductive insulating member can be better fixed and restrained, and the stability of the electrode assembly and the heat conductive insulating member can be improved. In some embodiments, the battery cell further includes an insulating member disposed at a side of the end cap facing the electrode assembly, and the two first bending parts are located at both sides of the insulating member. In these embodiments, the electrode assembly and the case may be further blocked from being conductively overlapped by wrapping both sides of the insulating member with the two first bent portions. In some embodiments, the supporting insulating member further includes two second bending portions disposed opposite