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CN-122003757-A - Battery cell, battery device and electricity utilization device

CN122003757ACN 122003757 ACN122003757 ACN 122003757ACN-122003757-A

Abstract

A battery cell (1), a battery device (100) and an electric device, the battery cell (1) including a case (10), an electrode assembly (20) and an insulating member (30). The housing (10) has a first wall (11). The electrode assembly (20) is housed in the case (10). The insulating member (30) is wrapped on the outer side of the housing (10) and covers the outer surface of the first wall (11). Wherein, insulating part (30) are provided with first fretwork district (31), and first fretwork district (31) are located one side that first wall (11) deviate from electrode assembly (20), and the surface of first wall (11) is in the position that corresponds first fretwork district (31) forming naked district (111), and naked district (111) are provided with recess (1111) and/or protruding (1112), can improve the reliability of battery.

Inventors

  • HUANG WEIHONG
  • ZHOU WENLIN
  • XU LIANGFAN
  • ZHANG QIANQIAN
  • XU HU
  • LI XING
  • JIN HAIZU

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240731

Claims (20)

  1. A battery cell, comprising: a housing having a first wall; an electrode assembly accommodated in the case; an insulating member which is coated on the outer side of the shell and covers the outer surface of the first wall; wherein, the insulating piece is provided with first fretwork district, first fretwork district is located first wall deviates from electrode assembly's one side, the surface of first wall is in corresponding first fretwork district's position forms naked district, naked district is provided with recess and/or arch.
  2. The battery cell of claim 1, wherein the recess comprises a first recess, the bare area comprises a plurality of the first recesses, and the plurality of first recesses form a bonding area.
  3. The battery cell according to any one of claims 1 to 2, wherein the opening of the first groove is circular, and the diameter R1 of the opening of the first groove is greater than or equal to 0.4mm and less than or equal to 1.2mm.
  4. A battery cell according to any one of claims 1 to 3, wherein the diameter R1 of the opening of the first groove is greater than or equal to 0.4mm and less than or equal to 0.8mm.
  5. The battery cell according to any one of claims 1 to 2, wherein the opening of the first groove is square, and the side length A1 of the opening of the first groove is greater than or equal to 0.4mm and less than or equal to 1.2mm.
  6. The battery cell of claim 5, wherein the opening of the first groove has a side length A1 of greater than or equal to 0.4mm and less than or equal to 0.8mm.
  7. The battery cell according to any one of claims 1 to 6, wherein a depth D1 of the first groove is greater than or equal to 0.08mm and less than or equal to 0.5mm in a thickness direction of the first wall.
  8. The battery cell according to any one of claims 1 to 7, wherein a depth D1 of the first groove is greater than or equal to 0.08mm and less than or equal to 0.2mm in a thickness direction of the first wall.
  9. The battery cell according to any one of claims 1 to 8, wherein the groove includes a second groove including a first groove section and a second groove section, the first groove section and the second groove section being arranged in a thickness direction of the first wall, the first groove section being closer to an outer surface of the first wall than the second groove section; Wherein the diameter of the first groove section is smaller than the diameter of the second groove section.
  10. The battery cell according to claim 9, wherein the second groove includes a third groove section, the first groove section, and the second groove section are arranged in order in a thickness direction of the first wall, one end of the third groove section extends to an outer surface of the first wall, and the other end is communicated with the first groove section; wherein the diameter of the first groove section is smaller than the diameter of the third groove section.
  11. The battery cell of any one of claims 9 to 10, wherein the diameter R2 of the first trough section is greater than or equal to 1mm and less than or equal to 3mm.
  12. The battery cell of any one of claims 9 to 11, wherein the diameter R3 of the second trough section is greater than or equal to 1.5mm and less than or equal to 4mm.
  13. The battery cell of claim 10, wherein the diameter R4 of the third groove section is greater than or equal to 2mm and less than or equal to 4mm.
  14. The battery cell according to any one of claims 9 to 13, wherein a depth D2 of the second groove is greater than or equal to 0.4mm and less than or equal to 1.5mm in a thickness direction of the first wall.
  15. The battery cell according to any one of claims 9 to 14, wherein a depth D3 of the first groove section in a thickness direction of the first wall is greater than or equal to 0.2mm and less than or equal to 0.75mm.
  16. The battery cell according to any one of claims 9 to 15, wherein a depth D4 of the second groove section is greater than or equal to 0.1mm and less than or equal to 0.4mm in a thickness direction of the first wall.
  17. The battery cell of claim 10, wherein a depth D5 of the third groove section is greater than or equal to 0.1mm and less than or equal to 0.4mm in a thickness direction of the first wall.
  18. The battery cell according to any one of claims 1 to 17, wherein the casing further comprises a second wall and a side wall, the second wall being disposed opposite to the first wall in a thickness direction of the first wall, the side wall being surrounded by the first wall and the second wall; The insulating member includes a first insulating member and a second insulating member that are provided separately, the first insulating member covering a part of an outer surface of the first wall, and the second insulating member covering at least a part of an outer surface of the second wall and at least a part of an outer surface of the side wall.
  19. The battery cell of claim 18, wherein the second insulator has a flange portion disposed circumferentially about the first wall and located on an outer surface of the first wall, the flange portion and an edge of the first insulator collectively circumscribing to form the first hollowed out area.
  20. The battery cell of any one of claims 1 to 19, further comprising an electrode terminal disposed at the first wall; The insulating piece is provided with the second fretwork area, the second fretwork area with first fretwork interval sets up, electrode terminal wears to locate the second fretwork area.

Description

Battery cell, battery device and electricity utilization device Technical Field The application relates to the technical field of battery production, 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 cell, a battery device and an electric device, which can improve the reliability of the battery device. The application is realized by the following technical scheme: in a first aspect, the present application provides a battery cell. The battery cell includes a case, an electrode assembly, and an insulating member. The housing has a first wall. The electrode assembly is accommodated in the case. The insulating piece is coated on the outer side of the shell and covers the outer surface of the first wall. Wherein, the insulating part is provided with first fretwork district, and first fretwork district is located one side that first wall deviates from electrode assembly, and the surface of first wall is in the position that corresponds first fretwork district formation naked district, and naked district is provided with recess and/or arch. According to the technical scheme provided by the embodiment of the application, the battery unit is connected with the box body through the bonding layer to form the battery device, and the grooves and/or the protrusions are arranged in the exposed area, so that the friction force between the exposed area and the bonding layer is increased, the risk that the bonding layer falls off from the exposed area is reduced, and the bonding reliability of the bonding layer and the exposed area is improved, so that the reliability of the connection of the battery unit with the box body is improved, and the reliability of the battery device is improved. In some embodiments, the recess includes a first recess, and the exposed region includes a plurality of first recesses, the plurality of first recesses forming the bonding region. According to the technical scheme provided by the embodiment of the application, the plurality of first grooves are arranged for being connected with the bonding layer, so that the bonding reliability of the bonding layer and the exposed area is further improved, the reliability of the battery monomer connection box body is further improved, and the reliability of the battery device is further improved. In some embodiments, the opening of the first groove is circular, and the diameter R1 of the opening of the first groove is greater than or equal to 0.4mm and less than or equal to 1.2mm. According to the technical scheme provided by the embodiment of the application, the opening diameter of the first groove meets the conditions, so that the processing is easy, and meanwhile, the bonding reliability of the bonding layer and the exposed area is improved. In some embodiments, the diameter R1 of the opening of the first groove is greater than or equal to 0.4mm and less than or equal to 0.8mm. According to the technical scheme provided by the embodiment of the application, the opening diameter of the first groove meets the conditions, so that the processing is easy, and meanwhile, the bonding reliability of the bonding layer and the exposed area is further improved. In some embodiments, the opening of the first groove is square, and the side length A1 of the opening of the first groove is greater than or equal to 0.4mm and less than or equal to 1.2mm. According to the technical scheme provided by the embodiment of the application, the opening side length of the first groove meets the conditions, so that the processing is easy, and meanwhile, the bonding reliability of the bonding layer and the exposed area is improved. In some embodiments, the side length A1 of the opening of the first groove is greater than or equal to 0.4mm and less than or equal to 0.8mm. According to the technical scheme provided by the embodiment of the application, the opening side length of the first groove meets the conditions, so that the processing is easy, and meanwhile, the bonding reliability of the bonding layer and the exposed area is further improved. In some embodiments, the depth D1 of the first groove is greater than or equal to 0.08mm and less than or equal to 0.5mm in the thickness direction of the first wall. According to the technical scheme provided by the embodiment of the application, the depth of the first groo