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CN-122003762-A - Battery monomer, battery and power consumption device

CN122003762ACN 122003762 ACN122003762 ACN 122003762ACN-122003762-A

Abstract

A battery cell (20), a battery (100) and an electric device. The battery cell includes a case (21), an electrode assembly (22), a fixing member (23), an electrode terminal (24), and a first insulating member (25). The fixing member (23) includes a body region (2311) and a thinning region (2312), the thinning region (2312) is connected to an end of the body region (2311) facing the electrode terminal (24), a surface of the thinning region (2312) facing the wall portion (211) is further away from the wall portion (211) than a surface of the body region (2311) facing the wall portion (211) in a thickness direction of the wall portion (211) of the case (21) to form a thinning groove (2314) at a side of the fixing member (23) facing the wall portion (211), the electrode terminal (24) is partially located between the thinning region (2312) and the wall portion (211), and the first insulating member (25) is partially accommodated in the thinning groove (2314). To optimize the dimensions of the fixing member (23) and the electrode terminal (24) in the thickness direction of the wall portion (211), which is advantageous in saving the space occupied by the battery cell (20).

Inventors

  • CHENG QI
  • ZHOU WENLIN
  • CAO MENGKAI
  • ZHENG YULIAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240904

Claims (20)

  1. A battery cell comprising: a housing having a wall portion; an electrode assembly accommodated in the case; An electrode terminal provided to the wall portion, the electrode terminal being electrically connected to the electrode assembly; A fixing member connected to the wall portion, the fixing member being disposed on a peripheral side of the electrode terminal, and A first insulating member at least partially disposed between the electrode terminal and the fixing member; Wherein the fixing member includes a body region and a thinning region connected to each other, the thinning region is provided in an end portion of the body region facing the electrode terminal, along a thickness direction of the wall portion, a surface of the thinning region facing the wall portion is further away from the wall portion than a surface of the body region facing the wall portion, so as to form a thinning groove at a side of the fixing member facing the wall portion, the electrode terminal portion is located between the thinning region and the wall portion, and the first insulating member portion is accommodated in the thinning groove.
  2. The battery cell according to claim 1, wherein the electrode terminal comprises: A body part electrically connected with the electrode assembly; An assembling portion protruding on an outer peripheral surface of the body portion, a portion of the assembling portion being located between the thinned region and the wall portion in a thickness direction of the wall portion, an orthographic projection of the main body region being non-overlapping with an orthographic projection of the assembling portion in the same plane perpendicular to the thickness direction of the wall portion; Wherein the thinned region is located between the main body region and the body portion, and a portion of the first insulating member is located between the thinned region and an outer peripheral surface of the body portion.
  3. The battery cell according to claim 2, wherein the fitting portion surrounds an outer side of the body portion.
  4. A battery cell according to claim 2 or 3, wherein one of the body portion and the first insulating member is provided with a first limit projection, and the other is provided with a first limit groove in which the first limit projection is accommodated.
  5. The battery unit according to claim 4, wherein the first limiting protrusions are a plurality of, the first limiting protrusions are arranged at intervals along the circumferential direction of the body portion, the first limiting grooves are arranged corresponding to the first limiting protrusions, and each first limiting groove is used for accommodating one first limiting protrusion.
  6. The battery cell according to claim 4 or 5, wherein the first limit projection is provided on the outer peripheral surface of the body portion, and the first insulating member is provided with the first limit groove.
  7. The battery cell according to claim 6, wherein a size of the first limit projection protruding from the outer peripheral surface of the body portion is smaller than a size of the fitting portion protruding from the outer peripheral surface of the body portion.
  8. The battery cell according to claim 6 or 7, wherein the first limit projection is connected to the fitting portion in a thickness direction of the wall portion, and the first limit projection is located on a side of the fitting portion facing the thinned region.
  9. The battery cell according to claim 8, wherein the first limit projection is spaced apart from the thinning section in a thickness direction of the wall portion.
  10. The battery cell according to claim 9, wherein a minimum distance between the first limit projection and the thinned region in a thickness direction of the wall portion is L, and L is equal to or greater than 0.5mm.
  11. The battery cell according to any one of claims 1 to 10, wherein one of the electrode terminal and the first insulating member is provided with a first stopper protrusion, and the other is provided with a first stopper groove, the first stopper protrusion being accommodated in the first stopper groove.
  12. The battery cell according to claim 11, wherein the electrode terminal is provided with the first limit protrusion, and the first insulating member is provided with the first limit groove; Wherein, in the same plane perpendicular to the thickness direction of the wall part, the orthographic projection of the first limit projection is not overlapped with the orthographic projection of the thinning area.
  13. The battery cell according to any one of claims 1-12, wherein the fixing member is disposed around the electrode terminal; One of the thinning area and the first insulating piece is provided with a second limiting groove, the other one of the thinning area and the first insulating piece is provided with a second limiting protrusion, and the second limiting protrusion is accommodated in the second limiting groove.
  14. The battery unit according to claim 13, wherein the second limiting grooves are a plurality of, the second limiting grooves are arranged at intervals along the circumferential direction of the fixing piece, the second limiting protrusions are arranged corresponding to the second limiting grooves, and each second limiting groove is used for accommodating one second limiting protrusion.
  15. The battery cell according to claim 13 or 14, wherein the thinned region is provided with the second limit groove, and the first insulating member is provided with the second limit protrusion.
  16. The battery cell according to claim 15, wherein the second limit groove penetrates both sides of the thinned region in a thickness direction of the wall portion.
  17. The battery cell according to any one of claims 1 to 16, wherein the fixing member includes a fixing portion that is located on one side of the wall portion in a thickness direction of the wall portion, the fixing portion including the main body region and the thinned region; at least part of the fixing part is embedded in the first insulating part, and along the thickness direction of the wall part, part of the first insulating part is positioned at one side of the fixing part, which is away from the wall part.
  18. The battery cell according to any one of claims 1-17, wherein the electrode terminal portion is housed within the thinning groove.
  19. The battery cell of any one of claims 1-18, wherein the thickness of the body region is D 1 and the thickness of the thinned region is D 2 , along the thickness direction of the wall portion, satisfying 1>D 2 /D 1 ≡1/3.
  20. The battery cell according to any one of claims 1 to 19, wherein the fixing member includes a fixing portion and a connecting portion, the fixing portion and the wall portion being disposed at an interval in a thickness direction of the wall portion, the fixing portion including the main body region and the thinned region, the connecting portion connecting the wall portion and the main body region.

Description

Battery monomer, battery and power consumption device Cross Reference to Related Applications The present application claims priority from international patent application PCT/CN2024/081988 entitled "battery cell, battery and electrical device" filed on 3/15 of 2024, the entire contents of which are incorporated herein by reference. Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. Background In recent years, new energy automobiles have been developed dramatically, and in the field of electric automobiles, a power battery plays an important role as a power source of the electric automobile. Along with the great popularization of new energy automobiles, the demands for power battery products are increasing, and batteries as core parts of the new energy automobiles have higher requirements on the use performance and the cruising ability. The battery cell of the battery generally includes a case and an electrode assembly received in the case, and the case is provided with electrode terminals, and the input or output of electric power of the battery cell is accomplished by electrically connecting the electrode terminals with the electrode assembly. However, the electrode terminal of the existing battery cell requires a larger assembly space, and the electrode terminal has a larger size, so that the electrode terminal occupies a larger space after being assembled on the housing, which is not beneficial to improving the energy density of the battery cell. Disclosure of Invention The embodiment of the application provides a battery cell, a battery and an electricity utilization device, which can effectively improve the energy density of the battery cell. In a first aspect, an embodiment of the application provides a battery cell, which comprises a shell, an electrode assembly, a fixing piece, an electrode terminal and a first insulating piece, wherein the shell is provided with a wall part, the electrode assembly is accommodated in the shell, the fixing piece is connected to the wall part, the fixing piece is arranged on the periphery side of the electrode terminal, the electrode terminal is arranged on the wall part and is electrically connected with the electrode assembly, the first insulating piece is at least partially arranged between the electrode terminal and the fixing piece, the fixing piece comprises a main body area and a thinning area which are connected with each other, the thinning area is arranged at the end part of the main body area, which faces the electrode terminal, and the surface of the thinning area, which faces the wall part, is farther away from the wall part than the surface of the main body area, which faces the wall part, so that a thinning groove is formed on one side of the fixing piece, which faces the wall part, the electrode terminal part is positioned between the thinning area and the wall part, and the first insulating piece is accommodated in the thinning groove. In the above technical solution, a fixing member is connected to a wall portion of the case, the fixing member is disposed on a peripheral side of the electrode terminal, and a portion of the electrode terminal is located between a thinned region of the fixing member and the wall portion, so that the fixing member and the wall portion can fit and hold a portion of the electrode terminal in a thickness direction of the wall portion to thereby achieve fitting of the electrode terminal to the wall portion, wherein a first insulating member is further disposed between the electrode terminal and the fixing member, so that the first insulating member can insulate the electrode terminal from the fixing member, by disposing a surface of the thinned region facing the wall portion farther from the wall portion in the thickness direction of the wall portion than a surface of the body region facing the wall portion to thereby form a thinned groove on a side of the fixing member facing the wall portion, and accommodating a portion of the first insulating member in the thinned groove, so that a space between the thinned region of the fixing member for accommodating the electrode terminal and the electrode terminal in the thickness direction of the wall portion can be enlarged, so that the first insulating member can realize the sharing of part space between the main body region of the fixing member and the first insulating member in the thickness direction of the wall portion while satisfying the insulating and isolating effects between the part of the electrode terminal between the thinned region and the wall portion and between the thinned region, so as to reduce the overall occupied size of the fixing member, the first insulating member and the electrode terminal in the thickness direction of the wall portion, so that the thickness of the part of the first insulating member between the thinned region and the electrode terminal in the thic