Search

CN-122003744-A - Battery cell, battery device and electricity utilization device

CN122003744ACN 122003744 ACN122003744 ACN 122003744ACN-122003744-A

Abstract

A battery unit (100), a battery device (1100) and an electric device are provided, the battery unit (100) comprises a shell (200) and an electrode assembly (101), the shell (200) is provided with an electrode leading-out part (2011), the electrode assembly (101) is arranged in the shell (200), the electrode assembly (101) comprises a first pole piece (1), the first pole piece (1) comprises a current collector (10) and an active substance layer (20), the current collector (10) comprises an insulating substrate (11) and a metal layer (12), the insulating substrate (11), the metal layer (12) and the active substance layer (20) are arranged in a stacked mode along the thickness direction of the current collector (10), at least part of the metal layer (12) is located between the insulating substrate (11) and the active substance layer (20), the metal layer (12) comprises a conductive main body part (13) and a conductive part (14) extending from the conductive main body part (13) along a first direction, at least part of the conductive main body part (13) is covered with the active substance layer (20) and at least part of the conductive main body part (13) is not covered with the active substance layer (20), the conductive part (14) is connected with the electrode lead-out part (2011), and the thickness of the conductive part (14) is larger than that of the conductive main body part (13).

Inventors

  • WU ZHIYANG
  • ZHANG YU
  • XUE QINGRUI
  • ZHANG JINSONG
  • ZHAO ZHENGYUAN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240723

Claims (20)

  1. A battery cell, comprising: a housing provided with an electrode lead-out portion; The electrode assembly is at least partially arranged in the shell, and comprises a first pole piece, wherein the first pole piece comprises a current collector and an active material layer, the current collector comprises an insulating matrix and a metal layer, the insulating matrix, the metal layer and the active material layer are arranged in a stacked mode along the thickness direction of the current collector, and at least part of the metal layer is positioned between the insulating matrix and the active material layer; Wherein the metal layer includes a conductive body portion and a conductive portion extending from the conductive body portion in a first direction perpendicular to a thickness direction of the current collector, at least a portion of the conductive body portion being covered with the active material layer, at least a portion of the conductive portion being not covered with the active material layer, the conductive portion being connected to the electrode lead-out portion; The thickness of the conductive portion is greater than the thickness of the conductive body portion in the thickness direction of the current collector.
  2. The battery cell of claim 1, wherein a surface of the conductive portion facing away from the insulating base is further away from the insulating base than a surface of the conductive body portion facing away from the insulating base.
  3. The battery cell according to claim 1 or 2, wherein the conductive portion includes a first conductive portion and a second conductive portion arranged along the first direction, the first conductive portion being connected between the second conductive portion and the conductive main body portion, the first conductive portion being covered with the active material layer, the second conductive portion being not covered with the active material layer, the second conductive portion being connected with the electrode lead-out portion.
  4. The battery cell of claim 3, wherein the active material layer includes a first active material portion and a second active material portion aligned in the first direction, the first active material portion being connected to the second active material portion, the first active material portion having a thickness less than a thickness of the second active material portion, at least a portion of the first active material portion overlying the first conductive portion, and at least a portion of the second active material portion overlying the conductive body portion.
  5. The battery cell of claim 4, wherein a surface of the first active material portion facing away from the insulating substrate is closer to the insulating substrate than a surface of the second active material portion facing away from the insulating substrate.
  6. The battery cell according to claim 4 or 5, wherein the second active material portion covers a part of the first conductive portion, and the first active material portion covers the other part of the first conductive portion.
  7. The battery cell of claim 6, wherein a portion of the first conductive portion covered by the second active material portion has a dimension W 1 and a portion of the first conductive portion covered by the first active material portion has a dimension W 2 ,W 1 ≥W 2 in the first direction.
  8. The battery cell according to any one of claims 4 to 7, wherein the conductive main body portion has a thickness t 1 , the first conductive portion has a maximum thickness t 2 , and the second active material portion has a thickness t 3 , wherein 0.002≤t 2 -t 1 )/t 3 ≤0.08, optionally 0.003≤t 2 -t 1 )/t 3 ≤0.06.
  9. The battery cell according to claim 8, wherein t 3 . Ltoreq.250. Mu.m, 60. Mu.m; alternatively, the process may be carried out in a single-stage, t 3 is less than or equal to 80 mu m and less than or equal to 180 mu m.
  10. The battery cell of any one of claims 3-9, wherein the first conductive portion has a dimension W 3 and the conductive portion has a dimension W 4 in the first direction, wherein W 3 /W 4 is less than or equal to 0.4.
  11. The battery cell of any one of claims 3-10, wherein the first conductive portion has a dimension W 3 and the conductive portion has a dimension W 4 in the first direction, wherein 2mm < W 4 -W 3 < 10mm, optionally 3mm < W 4 -W 3 < 6mm.
  12. The battery cell of any one of claims 3-11, wherein the first conductive portion has a dimension W 3 and the conductive body portion has a dimension W 5 in the first direction, wherein W 3 /(W 3 +W 5 ) is less than or equal to 0.45.
  13. The battery cell of any one of claims 3-12, wherein the first conductive portion has a dimension W 3 in the first direction, wherein 10mm < W 3 < 100mm.
  14. The battery cell according to any one of claims 3 to 13, wherein the second conductive portion includes at least one protruding portion connected to the first conductive portion, and wherein the protruding portion has a smaller size than the conductive body portion in a second direction perpendicular to a thickness direction of the current collector and the first direction.
  15. The battery cell of claim 14, wherein the tab includes a first tab portion and a second tab portion, the first tab portion connected between the second tab portion and the first conductive portion, the first tab portion having a dimension greater than a dimension of the second tab portion in the second direction.
  16. The battery cell according to claim 14 or 15, wherein the number of the protruding portions is plural, the plurality of protruding portions are arranged at intervals in the second direction, and a sum of dimensions of all the protruding portions is smaller than a dimension of the conductive body portion in the second direction.
  17. The battery cell of any one of claims 14-16, wherein the second conductive portion further comprises a transition portion connected between the protruding portion and the first conductive portion, the transition portion having a dimension along the second direction that is greater than a sum of dimensions of all of the protruding portions.
  18. The battery cell of claim 17, wherein the conductive body portion has a dimension L 1 and the transition portion has a dimension L 2 ,0.8≤L 2 /L 1 ≤1 in the second direction.
  19. The battery cell according to any one of claims 3 to 18, wherein the first electrode tab further comprises a conductive member, the conductive member comprises a first connection portion and a second connection portion arranged along the first direction, the first connection portion is connected to the second connection portion, the first connection portion is connected to a surface of the second conductive portion facing away from the insulating substrate, the second connection portion is located at a side of the second conductive portion facing away from the first conductive portion, and the second connection portion is connected to the electrode lead-out portion.
  20. The battery cell of claim 19, wherein the first connection is spaced apart from the active material layer in the first direction.

Description

Battery cell, battery device and electricity utilization device Technical Field The application belongs to the technical field of battery quick charge, and particularly relates to a battery cell, a battery device and an electricity utilization device. Background Battery cells 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. The battery device comprises one or more battery cells to meet different electric capacity use requirements, but in the technology of the battery cells, how to improve the quick charge performance of the battery cells is an important research direction. The statements made above merely serve to provide background information related to the present disclosure and may not necessarily constitute prior art. Content of the application The embodiment of the application aims to provide a battery cell, a battery device and an electricity utilization device, which are beneficial to improving the quick charge performance of the battery cell. The technical scheme adopted by the embodiment of the application is as follows: In a first aspect, in some embodiments, a battery cell is provided, the battery cell including a case provided with an electrode lead-out portion, and an electrode assembly at least partially disposed within the case, the electrode assembly including a first electrode sheet including a current collector and an active material layer, the current collector including an insulating base and a metal layer, the insulating base, the metal layer, and the active material layer being stacked in a thickness direction of the current collector, at least a portion of the metal layer being located between the insulating base and the active material layer, wherein the metal layer includes a conductive body portion and a conductive portion extending from the conductive body portion in a first direction, the first direction being perpendicular to the thickness direction of the current collector, at least a portion of the conductive body portion being covered with the active material layer, at least a portion of the conductive portion not being covered with the active material layer, the conductive portion being connected with the electrode lead-out portion, and a thickness of the conductive portion being greater than a thickness of the conductive body portion in the thickness direction of the current collector. By adopting the technical scheme of the embodiment, the electrode lead-out part is used for inputting or outputting electric energy under the condition that the battery monomer is normally used, so that the battery monomer is charged and discharged, the thickness of the conductive part connected with the electrode lead-out part is larger than that of the conductive main body part, the overcurrent area of the conductive part is increased, the overcurrent capacity of the conductive part is improved, the heat generation of the battery monomer is reduced, the charge and discharge efficiency of the battery monomer is improved, the quick charge performance of the battery monomer is improved, in addition, the current collector adopts a composite structure of an insulating substrate and a metal layer, the thickness of the metal layer is small compared with that of a pure metal current collector, burrs generated in the manufacturing process of the current collector are small, the internal short circuit risk of the battery monomer is reduced, and the use reliability of the battery monomer is improved. In some embodiments, a surface of the conductive portion facing away from the insulating base is further away from the insulating base than a surface of the conductive body portion facing away from the insulating base. By adopting the technical scheme of the embodiment, the surface of the conductive part, which is opposite to the insulating substrate, protrudes opposite to the insulating substrate relative to the conductive main body part, and the side space of the conductive part, which is opposite to the insulating substrate, can be utilized, so that the risk that the conductive part is accommodated by thinning the insulating substrate at the conductive part can be reduced, the structural strength of the insulating substrate at the conductive part can be improved, the structural strength of the current collector can be improved, and the use reliability of the battery cell can be improved. In some embodiments, the conductive portion includes a first conductive portion and a second conductive portion arranged along the first direction, the first conductive portion being connected between the second conductive portion and the conductive body portion, the first conductive portion being covered with the active material layer, the second conductive portion not being covered with the active material layer, the se