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CN-122000560-A - Battery monomer, battery device and electric equipment

CN122000560ACN 122000560 ACN122000560 ACN 122000560ACN-122000560-A

Abstract

The application relates to a battery unit, a battery device and electric equipment, wherein the battery unit comprises a shell, an end cover assembly, an electrode assembly and a heat conducting piece, wherein the shell is provided with a containing cavity with an opening at one end, the end cover assembly comprises an end cover covered on the opening, the electrode assembly is arranged in the containing cavity and comprises two end faces oppositely arranged and side faces connecting the two end faces, the heat conducting piece is arranged in the containing cavity and is arranged on at least part of the side faces, and the heat conducting piece is connected with the end cover. 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
  • WANG XITONG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241106

Claims (20)

  1. 1. A battery cell, comprising: a housing formed with a receiving chamber having an opening at one end; the end cover assembly comprises an end cover which covers the opening; the electrode assembly is arranged in the accommodating cavity and comprises two end faces which are oppositely arranged and a side face which is connected with the two end faces; The heat conducting piece is arranged in the accommodating cavity, is arranged on at least part of the side faces, and is connected with the end cover.
  2. 2. The battery cell of claim 1, wherein the thermally conductive member is disposed around the side surface.
  3. 3. The battery cell according to claim 1 or 2, wherein the heat conducting member is provided with a connecting portion extending toward the end cover, the connecting portion comprises an extending section and a bending section, the extending section is connected between the bending section and the heat conducting member, and one side of the bending section away from the heat conducting member is connected with one side of the end cover toward the accommodating cavity.
  4. 4. A battery cell according to claim 3, wherein the bending section extends from the extension section in a direction away from the housing side wall.
  5. 5. The battery cell of claim 3, wherein the end cap assembly further comprises an insulator disposed on a side of the end cap facing the electrode assembly, the insulator defining a relief opening for receiving the bent segment.
  6. 6. The battery cell according to claim 3, wherein the number of the connection parts is two, and the two connection parts are disposed at the same side of the heat conductive member at intervals.
  7. 7. The battery cell according to claim 3, wherein the electrode assembly includes two first side surfaces disposed opposite to each other in a first direction, the heat conductive member includes two first heat conductive sheets disposed opposite to each other in the first direction, and each of the first heat conductive sheets is disposed on each of the first side surfaces; At least one of the first heat conductive sheets is provided with the connection portion.
  8. 8. The battery cell of claim 7, wherein the electrode assembly further comprises two second sides disposed opposite in the second direction, the two first sides and the two second sides being alternately connected one after the other, the first sides having an area greater than an area of the second sides.
  9. 9. The battery cell as recited in claim 8, wherein the heat conductive member further comprises two second heat conductive sheets, the two first heat conductive sheets and the two second heat conductive sheets being alternately connected to each other to enclose the electrode assembly.
  10. 10. The battery cell according to any one of claims 1 to 9, wherein the battery cell includes two or more of the electrode assemblies and two or more of the heat conductive members, the heat conductive members being disposed in one-to-one correspondence with the electrode assemblies.
  11. 11. The battery cell according to claim 10, wherein the heat conductive member is wound around the side surface, and a gap is formed between both ends of the heat conductive member wound around the side surface, the gap being located at a side of the electrode assembly disposed corresponding to the heat conductive member toward the adjacent electrode assembly.
  12. 12. The battery cell according to any one of claims 1 to 9, wherein an electrode terminal is provided on the end cap, the heat conductive member is formed with a first opening, and the electrode terminal is electrically connected with the tab of the electrode assembly through the first opening.
  13. 13. The battery cell according to claim 1, wherein the heat conductive member includes an end-face heat conductive sheet and two first heat conductive portions disposed opposite to each other in a first direction, the first heat conductive portions being disposed between the electrode assembly and the case, the end-face heat conductive sheet being connected between the two first heat conductive portions and to the end cap.
  14. 14. The battery cell according to claim 13, wherein the number of the electrode assemblies is at least two, the at least two groups of the electrode assemblies are stacked in the first direction, the heat conductive member further includes a second heat conductive portion provided between two groups of adjacent electrode assemblies, and the end face heat conductive sheet is connected to the second heat conductive portion.
  15. 15. The battery cell of claim 14, wherein the second thermally conductive portion includes a second body portion and two second connection segments, the second body portion and the end surface thermally conductive sheet are disposed at intervals, the second connection segments are connected between the second body portion and the end surface thermally conductive sheet, the two second connection segments are disposed at intervals along a second direction, and an avoidance groove is formed between the two second connection segments, and the second direction and the first direction are perpendicular to each other.
  16. 16. The battery cell of claim 14, further comprising a support frame between the end face heat conductive sheet and the electrode assembly, wherein a mounting space is formed between the support frame and the end face heat conductive sheet.
  17. 17. The battery cell as recited in claim 16, wherein the bracket includes a first support portion and a second support portion, the first support portion and the second support portion are disposed on two sides of the second heat conduction portion along the first direction, respectively, and a gap for passing through the second heat conduction portion is formed between the first support portion and the second support portion.
  18. 18. The battery cell of claim 16, wherein the bracket includes a support section and two raised sections, the support section is disposed at intervals with the end-face heat-conducting sheet, the raised sections extend from the support section toward the end cap, the two raised sections are disposed at intervals along a second direction, the end-face heat-conducting sheet, the support section, and the two raised sections enclose at least a portion of the mounting space, and the second direction and the first direction are perpendicular to each other.
  19. 19. The battery cell as recited in claim 14, wherein the end face thermally conductive sheet and the two first thermally conductive portions enclose a covered space, and a plurality of groups of the electrode assemblies are located in the covered space.
  20. 20. The battery cell according to any one of claims 13 to 19, wherein the end face heat conductive sheet is provided in conforming relation to the end cap; the end face heat conducting fin is formed with a pole hole, and/or the end face heat conducting fin is formed with a pressure relief hole.

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. In a first aspect, the application provides a battery cell, which comprises a shell, an end cover assembly, an electrode assembly and a heat conducting piece, wherein the shell is provided with a containing cavity with an opening at one end, the end cover assembly comprises an end cover covered on the opening, the electrode assembly is arranged in the containing cavity and comprises two end faces which are oppositely arranged and side faces which are connected with the two end faces, the heat conducting piece is arranged in the containing cavity, the heat conducting piece is arranged on at least part of the side faces, and the heat conducting piece is connected with the end cover. In the scheme of the embodiment of the application, the battery monomer comprises a shell, an end cover assembly, an electrode assembly and a heat conducting piece, wherein the electrode assembly is positioned in the accommodating cavity, the shell and the end cover provide accommodating and protecting functions for the electrode assembly together, and the heat of the position where the electrode assembly is in heat conduction contact with the heat conducting piece can be conducted through the heat conducting piece by arranging the heat conducting piece on at least part of the side surface of the electrode assembly, so that the integral temperature uniformity of the electrode assembly is improved. And make the heat conduction spare be connected with the end cover, can dispel the heat with electrode assembly's heat through the heat conduction spare conduction to the end cover, promote electrode main part and external environment and carry out the speed of heat exchange to balanced battery monomer inside temperature improves because the inside temperature of battery monomer is too high or too low and brings the problem of adverse effect to battery monomer's performance and life. In some embodiments, the thermally conductive member is disposed around the side surface. In these embodiments, by providing the heat conductive member around the outer circumference of the electrode assembly, the contact area of the heat conductive member with the side surface can be increased, further improving the temperature uniformity of the electrode assembly as a whole. In some embodiments, the heat conducting member is provided with a connecting portion extending towards the end cover, the connecting portion comprises an extending section and a bending section, the extending section is connected between the bending section and the heat conducting member, and one side of the bending section away from the heat conducting member is connected with one side of the end cover towards the accommodating cavity. In these embodiments, the extension section may be disposed so that the bending section is closer to the end cover, and a side of the bending section facing away from the heat conducting member is connected to a surface of the end cover facing toward the accommodating cavity, so that a contact area between the bending section and the end cover can be increased, and then, a heat conducting efficiency of the heat conducting member is improved. In some embodiments, the bending section extends from the extension section in a direction away from the housing sidewall. In these embodiments, the bending section extends from the extension section along a direction away from the side wall of the housing, so that the attaching area of the bending section and the end cover can be increased, and the heat conduction efficiency of the heat conduction member is further improved. In some embodiments, the end cap assembly further includes an insulator disposed on a side of the end cap facing the electrode assembly, the insulator forming a relief opening for receiving the bent segment. In these embodiments, through seting up on the insulating part and dodging the opening, hold the bending section that sets up with the laminat