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CN-122029683-A - Battery monomer, battery and electric equipment

CN122029683ACN 122029683 ACN122029683 ACN 122029683ACN-122029683-A

Abstract

The embodiment of the application provides a battery monomer, a battery and electric equipment. The battery cell includes a case, an electrode assembly, an electrode terminal, and an adapter. The electrode assembly is arranged in the shell and provided with a tab, the electrode terminal is arranged on the first wall, the adapter piece comprises a first part and a second part which are connected with each other, the first part is welded with the electrode terminal to form a first welding part, the second part is welded with the tab to form a second welding part, on a projection plane perpendicular to the thickness direction of the first wall, the orthographic projection of the first welding part is a first projection, the orthographic projection of the second welding part is a second projection, and along the first direction, the first projection and the second projection are at least partially overlapped, and the first direction is perpendicular to the thickness direction of the first wall. According to the technical scheme provided by the application, the charge-discharge cycle performance of the battery monomer can be improved.

Inventors

  • YANG KAIHUAN
  • ZHOU WENLIN
  • KE HAIBO
  • CHENG QI
  • XING CHENGYOU

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20240723

Claims (18)

  1. A battery cell, comprising: a housing comprising a first wall; an electrode assembly disposed within the housing, the electrode assembly having a tab; an electrode terminal provided on the first wall; An adapter member including a first portion and a second portion connected to each other, the first portion being welded to the electrode terminal to form a first welded portion, the second portion being welded to the tab to form a second welded portion; The front projection of the first welding part is a first projection, the front projection of the second welding part is a second projection on the same projection plane perpendicular to the thickness direction of the first wall, and the first projection and the second projection are at least partially overlapped along the first direction, wherein the first direction is perpendicular to the thickness direction of the first wall.
  2. The battery cell of claim 1, wherein the first projection and the second projection have overlapping areas along the first direction on a same projection plane perpendicular to a thickness direction of the first wall, and orthographic projections of portions of the adapter in the overlapping areas are continuously distributed.
  3. The battery cell according to claim 1 or2, wherein the second portion is located on one side of the first portion in the first direction, the first direction being parallel to a width direction of the first wall.
  4. The battery cell of any one of claims 1-3, wherein the second portion has a dimension greater than or equal to 20mm and less than or equal to 50mm in a second direction, the first direction, and the thickness direction of the first wall being perpendicular to each other, the second direction being parallel to the length direction of the first wall.
  5. The battery cell of any one of claims 1-4, wherein the first wall has a first edge and a second edge disposed opposite in a second direction; the second portion having a first end proximate the first edge and a second end proximate the second edge, the first portion having a third end proximate the first edge and a fourth end proximate the second edge; In a direction in which the second edge points towards the first edge, the first end being beyond the third end, and/or, The second end extends beyond the fourth end along the direction that the first edge points to the second edge; The second direction, the first direction and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall.
  6. The battery cell of any one of claims 1-4, wherein the first wall has a first edge and a second edge disposed opposite in a second direction; the second portion having a first end proximate the first edge and a second end proximate the second edge, the first portion having a third end proximate the first edge and a fourth end proximate the second edge; The first end and the third end are flush along the direction of the second edge pointing to the first edge, and the second end and the fourth end are flush along the direction of the first edge pointing to the second edge; The second direction, the first direction and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall.
  7. The battery cell according to any one of claims 1-6, wherein the first wall has a first edge and a second edge disposed opposite each other in a second direction, the first direction, and a thickness direction of the first wall being perpendicular to each other, the second direction being parallel to a length direction of the first wall; On the same projection plane perpendicular to the thickness direction of the first wall, the first projection has a third edge near the first edge and a fourth edge near the second edge, and the second projection has a fifth edge near the first edge and a sixth edge near the second edge; the third edge does not go beyond the fifth edge in the direction in which the second edge points toward the first edge, the fourth edge does not go beyond the sixth edge in the direction in which the first edge points toward the second edge, or, The fifth edge does not exceed the third edge in a direction in which the second edge points to the first edge, and the sixth edge does not exceed the fourth edge in a direction in which the first edge points to the second edge.
  8. The battery cell of any one of claims 1-7, wherein the first projection and the second projection completely overlap along the first direction.
  9. The battery cell according to any one of claims 1-8, wherein the number of the second portions is two, and two of the second portions are respectively connected to both ends of the first portion in the first direction; The first projection is located between the two second projections along the first direction on the same projection plane perpendicular to the thickness direction of the first wall.
  10. The battery cell according to claim 9, wherein the number of the electrode assemblies is two, the two electrode assemblies are stacked in the first direction, and the tabs of the two electrode assemblies are connected to the two second portions, respectively.
  11. The battery cell of any one of claims 1-9, wherein the housing comprises a shell having an opening and an end cap covering the opening, the end cap being the first wall; the number of the electrode assemblies is one, and the size of the case in the first direction is greater than or equal to 20mm and less than or equal to 40mm, or, The number of the electrode assemblies is two, the two electrode assemblies are stacked along the first direction, and the size of the shell in the first direction is more than or equal to 35mm and less than or equal to 90mm; Wherein the first direction is parallel to a width direction of the first wall.
  12. The battery cell of any one of claims 1-11, wherein the housing comprises a shell having an opening and an end cap covering the opening, the end cap being the first wall; the dimension of the housing in the second direction is greater than or equal to 120mm and less than or equal to 300mm; The second direction, the first direction and the thickness direction of the first wall are perpendicular to each other, and the second direction is parallel to the length direction of the first wall.
  13. The battery cell of any one of claims 1-12, wherein the battery cell further comprises: A first insulating member, at least a portion of which is disposed between the first wall and the adapter member in a thickness direction of the first wall; The first wall is provided with a first through hole, a part of the electrode terminal is arranged in the first through hole, the first insulating piece is provided with a first surface which is away from the first wall, the first surface is pointed in the direction of the electrode assembly along the first wall, and the electrode terminal protrudes out of the first surface; The adapter further comprises a bending part, the second part is connected with the first part through the bending part, and the first part protrudes out of the second part towards the direction deviating from the first wall along the thickness direction of the first wall.
  14. The battery cell of claim 13, wherein the tab is located on a side of the second portion facing away from the first insulator in a thickness direction of the first wall.
  15. The battery cell according to claim 14, wherein a distance between the second portion and the first insulating member in a thickness direction of the first wall is greater than or equal to 0.1mm and less than or equal to a dimension of the second portion in the thickness direction of the first wall.
  16. The battery cell of any one of claims 1-15, wherein a distance between a center of the first projection and a center of the second projection is no greater than 30mm in a second direction, the first direction, the second direction, and a thickness direction of the first wall being perpendicular to each other.
  17. A battery comprising a cell according to any one of claims 1-16.
  18. A powered device comprising a battery cell according to any one of claims 1-16 or a battery according to claim 17, the battery cell or the battery being configured to provide electrical energy.

Description

Battery monomer, battery and electric equipment Technical Field The application relates to the technical field of batteries, in particular to a battery monomer, a battery and electric equipment. 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. The charge-discharge cycle performance of a battery is a non-negligible problem in the manufacturing process of the battery. Therefore, how to improve the charge-discharge cycle performance of the battery is a technical problem to be solved in the battery technology. Disclosure of Invention The application provides a battery monomer, a battery and electric equipment, which can improve the charge-discharge cycle performance of the battery monomer. The application is realized by the following technical scheme: In a first aspect, the present application provides a battery cell including a housing, an electrode assembly, an electrode terminal, and an adapter. The electrode assembly is arranged in the shell and provided with a tab, the electrode terminal is arranged on the first wall, the adapter piece comprises a first part and a second part which are connected with each other, the first part is welded with the electrode terminal to form a first welding part, the second part is welded with the tab to form a second welding part, the orthographic projection of the first welding part is a first projection, the orthographic projection of the second connecting part is a second projection on the same projection plane perpendicular to the thickness direction of the first wall, and the first projection and the second projection at least partially overlap along the first direction, and the first direction is perpendicular to the thickness direction of the first wall. According to the battery cell provided by the embodiment of the application, on the same projection plane perpendicular to the thickness direction of the first wall, the first projection and the second projection are at least partially overlapped along the first direction, when current flows from the first welding part to the second welding part or from the second welding part to the first welding part, the current can flow along the first direction, the flow path of the current in the adapter is shorter, and the overcurrent capacity of the adapter can be improved, so that the charge-discharge cycle performance of the battery cell is improved. According to some embodiments of the application, the first projection and the second projection have overlapping areas along the first direction on a same projection plane perpendicular to the thickness direction of the first wall, and the orthographic projections of the portions of the adapter in the overlapping areas are continuously distributed. In the above scheme, on the section parallel to the first direction and passing through the first welding part and the second welding part, the section of the adapter is continuous in the first direction, so that when current flows between the first welding part and the second welding part, the current has a shorter flow path, and the overcurrent capacity of the adapter is improved conveniently. According to some embodiments of the application, the second portion is located on one side of the first portion in a first direction, the first direction being parallel to the width direction of the first wall. In the above scheme, the second portion is located one side of the first portion along the width direction of the first wall, the space occupied by the first portion and the second portion in the length direction of the first wall is smaller, and the size of the tab in the length direction of the first wall can be larger, so that the overcurrent capacity between the tab and the adapter is improved. According to some embodiments of the application, the second portion has a dimension greater than or equal to 20mm and less than or equal to 50mm in a second direction, the first direction, and the thickness direction of the first wall being perpendicular to each other, the second direction being parallel to the length direction of the first wall. In the above scheme, the dimension of the second portion along the second direction satisfies the above relation, on one hand, the dimension of the tab in the second direction may be larger so as to improve the overcurrent capability between the tab and the adaptor, and on the other hand, the space occupied by the second portion in the second direction is smaller, so that the interference between the adaptor and other components (such as an insulating member, a pressure release mechanism, etc.) is reduced. According to some