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CN-122029684-A - Battery cell, battery device and electricity utilization device

CN122029684ACN 122029684 ACN122029684 ACN 122029684ACN-122029684-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 at least partially accommodated in the shell (200), the electrode assembly (101) comprises a first pole piece (1), the first pole piece (1) comprises a conductive member (30), a current collector (10) and an active substance layer (20), the conductive member (30) is connected with the electrode leading-out part (2011), the current collector (10) comprises an insulating base body (11) and a metal layer (12), the insulating base body (11), the metal layer (12) and the active substance layer (20) are stacked along the thickness direction of the current collector (10), the metal layer (12) comprises a main body part (121) and at least one protruding part (122), the protruding part (122) extends outwards from the end of the main body part (121) along a first direction, each protruding part (122) is connected with the conductive member (30), the protruding part (122) comprises a first sub-part (1) connected with the main body part (121), the protruding part (121) along the first direction (122) is equal to the first sub-part (122) in size of all the first direction (121) and the main part (121) is equal to the size (5) of the main part (1) and the size (5) is equal to the size (5 times, the second direction is perpendicular to the first direction and the thickness direction of the current collector (10).

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
20260512
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 accommodated in the shell, and comprises a first pole piece, wherein the first pole piece comprises a conductive member, a current collector and an active material layer, the conductive member is connected with the electrode lead-out part, the current collector comprises an insulating matrix and a metal layer, the insulating matrix, the metal layer and the active material layer are stacked 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; The metal layer comprises a main body part and at least one protruding part, wherein the protruding part extends outwards from the end part of the main body part along a first direction, the first direction is perpendicular to the thickness direction of the current collector, and each protruding part is connected with the conductive member; the protruding parts comprise first protruding sub-parts connected with the main body part, and the sum of the sizes of the first protruding sub-parts of all the protruding parts is more than 0.5 times of the size of the main body part along a second direction, wherein the second direction is perpendicular to the first direction and the thickness direction of the current collector.
  2. The battery cell of claim 1, wherein a sum of dimensions of the first projection sub-portions of all the projections is 0.6 times or more of a dimension of the main body portion in the second direction.
  3. The battery cell according to claim 1 or 2, wherein the conductive member includes a first connection part and at least one second connection part arranged in the first direction, the first connection part and the second connection part being connected, the second connection part being connected to the electrode lead-out part, the first connection part being welded to a surface of the metal layer facing away from the insulating base body to form a first weld, the second connection part being located at a side of the protrusion facing away from the main body; The first solder is located on a side of the active material layer facing the protruding portion along the first direction.
  4. The battery cell of claim 3, wherein the first solder comprises a first solder portion, and the first connecting portion is soldered to a surface of the protruding portion facing away from the insulating substrate and forms the first solder portion.
  5. The battery cell of claim 4, wherein the first weld extends from one side of the protrusion to the other side of the protrusion in the second direction.
  6. The battery cell of claim 4 or 5, wherein the tab further comprises a second tab portion, the first tab portion being connected between the second tab portion and the body portion; The first protrusion has a larger dimension than the second protrusion along the second direction; the first welding part comprises a first welding sub-part, and the first connecting part is welded to the first protruding sub-part and forms the first welding sub-part.
  7. The battery cell of claim 6, wherein the first solder pad sub-portion extends from one side of the first tab sub-portion to the other side of the first tab sub-portion in the second direction.
  8. The battery cell of claim 6 or 7, wherein the first solder portion further comprises a second solder sub-portion, and the first connecting portion is soldered to a surface of the second tab portion facing away from the insulating substrate and forms the second solder sub-portion.
  9. The battery cell of claim 8, wherein the second solder pad portion extends from one side of the second tab portion to the other side of the second tab portion in the second direction.
  10. The battery cell according to any one of claims 3 to 9, wherein the number of the protruding portions is plural, the protruding portions are arranged at intervals along the second direction, and each protruding portion is welded with the first connecting portion.
  11. The battery cell of claim 10, wherein the first connection part comprises a plurality of first connection sub-parts, the plurality of first connection sub-parts are arranged at intervals along the second direction, the number of the second connection parts is a plurality, and each first connection sub-part is connected with each second connection part in a one-to-one correspondence; Each first connecting sub-part is welded on the surface of each protruding part, which faces away from the insulating substrate, in a one-to-one correspondence manner.
  12. The battery cell according to any one of claims 3 to 11, wherein the main body portion includes a transition portion and a conductive portion, the transition portion is connected between the protruding portion and the conductive portion, the conductive portion is covered with the active material layer, the transition portion and the protruding portion are not covered with the active material layer, and the first connection portion is connected to a surface of the transition portion facing away from the insulating base.
  13. The battery cell of claim 12, wherein the conductive 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.
  14. The battery cell according to claim 12 or 13, wherein the first solder comprises a second solder, and the first connection is soldered to a surface of the transition portion facing away from the insulating substrate and forms the second solder.
  15. The battery cell of claim 14, wherein the transition portion has a dimension L 2 and the second weld portion has a dimension L 3 ,0.8≤L 3 /L 2 ≤1 in the second direction.
  16. The battery cell according to any one of claims 12 to 15, wherein the number of the protruding parts is plural, and the protruding parts are arranged at intervals along the second direction; The first connecting parts comprise second connecting sub-parts and a plurality of first connecting sub-parts, the first connecting sub-parts are arranged at intervals along the second direction, and the first connecting sub-parts are welded on the surface of the protruding parts, which is opposite to the insulating substrate, in a one-to-one correspondence manner; The number of the second connecting parts is multiple, one side of each first connecting sub-part is connected with each second connecting part in a one-to-one correspondence manner along the first direction, the other side of each first connecting sub-part is connected with the second connecting sub-part, and the second connecting sub-parts are continuously arranged along the second direction; The second connector part is welded on the surface of the transition part, which is opposite to the insulating substrate.
  17. The battery cell according to any one of claims 3 to 16, wherein the first connection portion is spaced apart from the active material layer in the first direction.
  18. The battery cell according to any one of claims 3 to 17, wherein the electrode assembly further comprises an insulating member, the insulating member comprising a first insulating portion, the first insulating portion covering a surface of the metal layer facing away from the insulating base, the entire first insulating portion being located between the first solder and the active material layer.
  19. The battery cell of claim 18, wherein the first insulating portion is located between the first connecting portion and the active material layer.
  20. The battery cell of claim 19, wherein the insulator further comprises a second insulator, at least a portion of the second insulator overlying the first weld.

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 electric device, which comprise but are not limited to, capable of 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 that includes a case provided with an electrode lead-out portion, and an electrode assembly at least partially housed within the case, the electrode assembly including a first electrode tab including a conductive member, a current collector, and an active material layer, the conductive member being connected to the electrode lead-out portion, the current collector including an insulating base and a metal layer, the insulating base, the metal layer, and the active material layer being disposed in a stacked manner 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, the metal layer including a main body portion and at least one protrusion extending outwardly from an end of the main body portion in the first direction, the first direction being perpendicular to a thickness direction of the current collector, each protrusion being connected to the conductive member, at least a portion of the main body portion being covered with the active material layer, at least a portion of the protrusion not being covered with the active material layer, the protrusion including a first protrusion portion connected to the main body portion, and a sum of sizes of the first protrusions of all protrusions of 0.5 times or more of the main body portion in a second direction, wherein the second direction is perpendicular to 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 of normal use of the battery cell, so that the battery cell is charged and discharged, and the sum of the sizes of the first convex sub-parts of all the convex parts is more than 0.5 times of the size of the main body part along the second direction, so that the total overcurrent area between the convex parts and the main body part is increased, the total overcurrent capacity between the convex parts and the main body part is improved, the overcurrent capacity of the first pole piece is improved, the heat generation of the battery cell is reduced, the charging efficiency and the discharging efficiency of the battery cell are improved, and the quick charge performance of the battery cell is improved. In addition, the current collector adopts a composite structure of an insulating matrix and a metal layer, the thickness of the metal layer is small compared with that of a pure metal current collector, burrs generated by the metal layer in the manufacturing process of the current collector are small, the internal short circuit risk of a battery cell is reduced, and the use reliability of the battery cell is improved, so that the battery cell provided by the embodiment of the application can better consider overcurrent capacity and use reliability. In some embodiments, the sum of the dimensions of the first projecting sub-portions of all the projecting portions is more than 0.6 times the dimension of the main body portion in the second direction. Through adopting the technical scheme of this embodiment, can increase the total area that overflows between bulge and the main part effectively, improve the total overcurrent ability between bulge and the main part, be favorable to improving the overcurrent ability of first pole piece, reduce the free heat production of battery, be favorable to improving free charging efficiency of battery and discharge efficiency, improve free quick charge performance of battery. In some embodiments, the conductive member includes a first connection portion and at least one second conn