Search

CN-122003760-A - Battery cell, battery device, electricity utilization device and stamping method

CN122003760ACN 122003760 ACN122003760 ACN 122003760ACN-122003760-A

Abstract

A battery unit, a battery device, an electricity utilization device and a stamping method belong to the technical field of batteries. The shell (2) is provided with at least one first boss (21) protruding along the direction of the shell (2) away from the electrode assembly (1) and a counter bore (23) corresponding to each first boss (21), the counter bore (23) is positioned on one side of the shell (2) facing the electrode assembly (1), the arrangement direction of the first boss (21) and the electrode assembly (1) is in a first direction, a first sub-hole (231) is positioned on one side of a second sub-hole (232) facing the electrode assembly (1) along the first direction, the second sub-hole (232) is partially formed on the first boss (21) and is projected along the first direction, a projection area of the second sub-hole (232) is at least partially positioned in a projection area of the first sub-hole (231), the conductive assemblies (3) are at least partially electrically connected with the electrode assembly (1), the number of the conductive assemblies (3) is at least one, and each conductive assembly (3) is in limiting contact with the at least one first boss (21) respectively. The resistance of stamping deformation of the shell (2) is reduced through the first sub-holes (231), so that the first boss (21) can be stamped to a higher height, and the first boss (21) can limit the conductive assembly (3) better.

Inventors

  • CHEN XINXIANG
  • LIN YUANYUAN
  • LIN DENGHUA
  • HUANG SHOUJUN
  • ZHENG YULIAN
  • WANG PENG

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20240731

Claims (18)

  1. A battery cell comprising: An electrode assembly; A case having at least one first boss protruding in a direction in which the case faces away from the electrode assembly and a counter bore corresponding to each of the first bosses, the electrode assembly being located within the case, the counter bore being located on a side of the case facing the electrode assembly, the first boss and the electrode assembly being arranged in a first direction, the counter bore having first and second sub-holes communicating with each other, the first sub-hole being located on a side of the second sub-hole facing the electrode assembly in the first direction, the second sub-hole being formed partially in the first boss and projected in the first direction, a projection area of the second sub-hole being located at least partially within a projection area of the first sub-hole; And the conductive assemblies are at least partially electrically connected with the electrode assemblies, the number of the conductive assemblies is at least one, and each conductive assembly is in limit contact with at least one first boss respectively.
  2. The battery cell of claim 1, wherein a projected area of the first boss is located within a projected area of the first sub-aperture, projected in the first direction.
  3. The battery cell according to claim 1 or 2, wherein the pore wall surface of the second sub-pore comprises a first surface and a second surface connected to each other, the second surface surrounding the first surface, the first surface having an angle with the second surface in the range of 95 ° -120 °.
  4. The battery cell according to any one of claims 1 to 3, wherein the housing comprises: A housing; the end cover is connected with the shell, the electrode assembly is located in the space defined by the shell and the end cover, the first boss is formed in the end cover, the first boss protrudes along the direction that the end cover deviates from the electrode assembly, and the counter bore is located on one side of the end cover, facing the electrode assembly.
  5. The battery cell of claim 4, wherein a ratio of the depth of the first sub-aperture to the thickness of the end cap is a first ratio, the first ratio ranging from 0.2 to 0.5.
  6. The battery cell according to claim 4 or 5, wherein a minimum distance between a wall surface of the second sub-hole and an outer surface of the first boss is a preset distance, a ratio of the preset distance to a thickness of the end cap is a second ratio, and the second ratio ranges from 0.35 to 0.8.
  7. The battery cell according to any one of claims 4-6, wherein a recess is formed on one side of the end cover facing away from the electrode assembly, the recess and the first boss enclose a sink groove surrounding the first boss, and an opening direction of the sink groove faces away from the electrode assembly.
  8. The battery cell of claim 7, wherein a ratio of the depth of the countersink to the thickness of the end cap is a third ratio, the third ratio ranging from 0.02 to 0.1.
  9. The battery cell according to claim 7 or 8, wherein the countersink has a circular shape.
  10. The battery cell according to any one of claims 4 to 9, wherein the first boss protrudes from the end cover in the thickness direction of the end cover by a first dimension, the ratio of the first dimension to the thickness of the end cover is a fourth ratio, and the fourth ratio is in the range of 0.8 to 1.5.
  11. The battery cell according to any one of claims 4-10, wherein the end cap is steel.
  12. The battery cell according to any one of claims 1-11, wherein the conductive assembly comprises: the insulating part is positioned on one side of the shell, which is away from the electrode assembly, and is provided with an avoidance hole and at least one second boss, and each second boss is sleeved on the corresponding first boss; And the conductive terminals penetrate through the avoidance holes, the conductive terminals are electrically connected with the electrode assemblies, each conductive terminal is sleeved on the corresponding second boss, and the insulating piece is at least partially positioned between the conductive terminal and the shell.
  13. The battery cell of claim 12, wherein the conductive terminal comprises: a first conductive member penetrating the escape hole, the first conductive member being electrically connected with the electrode assembly; the second conductive piece is connected with the first conductive piece, the second conductive piece is located on one side, away from the electrode assembly, of the shell, the second conductive piece is sleeved on the second boss correspondingly, and the insulating piece is located at least partially between the second conductive piece and the shell.
  14. The battery cell according to any one of claims 1-13, wherein the number of the first bosses is at least two, and each conductive component is in limiting contact with at least two first bosses.
  15. A battery device, comprising: A case; The battery cell according to any one of claims 1 to 14, which is mounted to the case.
  16. An electrical device, comprising: a device body; the battery device according to claim 15, mounted to the device body.
  17. A stamping method comprising the steps of: arranging a shell between a first stamping die and a second stamping die, wherein the first stamping die is provided with a cavity, the cavity is used for avoiding the first boss, the second stamping die is provided with a first pressing head, the first pressing head comprises a first sub-pressing head and a second sub-pressing head which are mutually connected, the first pressing head and the second pressing head are projected along the arrangement direction of the first sub-pressing head and the second sub-pressing head, the projection area of the second sub-pressing head is positioned in the projection area of the first sub-pressing head, the first sub-pressing head is used for stamping out the first sub-hole, and the second sub-pressing head is used for stamping out the second sub-hole and the first boss; at least one of the first stamping die and the second stamping die is driven to move toward the other of the first stamping die and the second stamping die to stamp the housing between the first stamping die and the second stamping die.
  18. The stamping method of claim 17, wherein the first stamping die is further formed with a second ram for stamping the sink.

Description

Battery cell, battery device, electricity utilization device and stamping method Technical Field The application relates to the technical field of batteries, in particular to a battery cell, a battery device, an electric device and a stamping method. Background Batteries are increasingly used in life and industry, and for example, new energy automobiles equipped with batteries have been widely used. In a new energy vehicle that carries a battery, the battery may be used to fully or partially power. In the related art, the conductive member of the battery cell may be rotated. Disclosure of Invention In view of the foregoing, it is desirable to provide a battery cell, a battery device, an electric device and a stamping method for limiting the rotation of the conductive component. A first aspect of an embodiment of the present application provides a battery cell, including: An electrode assembly; A case having at least one first boss protruding in a direction in which the case faces away from the electrode assembly and a counter bore corresponding to each of the first bosses, the electrode assembly being located within the case, the counter bore being located on a side of the case facing the electrode assembly, the first boss and the electrode assembly being arranged in a first direction, the counter bore having first and second sub-holes communicating with each other, the first sub-hole being located on a side of the second sub-hole facing the electrode assembly in the first direction, the second sub-hole being formed partially in the first boss and projected in the first direction, a projection area of the second sub-hole being located at least partially within a projection area of the first sub-hole; And the conductive assemblies are at least partially electrically connected with the electrode assemblies, the number of the conductive assemblies is at least one, and each conductive assembly is in limit contact with at least one first boss respectively. In the embodiment of the application, at least part of materials around the first boss are pushed to one side away from the electrode assembly through the first sub-hole, so that the resistance of stamping deformation of the shell is reduced, the stamping die is beneficial to partially extending into the second sub-hole to stamp the first boss to a higher height, and the first boss can well limit the conductive assembly. In an embodiment, the projection area of the first boss is located in the projection area of the first sub-hole along the first direction. In the embodiment of the application, the materials around the first boss are extruded along the protruding direction of the first boss through the first sub-hole, so that the resistance of the stamping die for stamping the first boss in the second sub-hole is reduced, and the first boss is stamped to a higher height. In an embodiment, the hole wall surface of the second sub-hole includes a first surface and a second surface connected to each other, the second surface surrounds the first surface, and an included angle between the first surface and the second surface ranges from 95 ° to 120 °. In the embodiment of the application, the stretching degree of the hole wall of the second sub-hole in the stamping process is reduced, the resistance of the stamping die for stamping the first boss in the second sub-hole is reduced, and the stamping difficulty is reduced. In one embodiment, the housing comprises: A housing; the end cover is connected with the shell, the electrode assembly is located in the space defined by the shell and the end cover, the first boss is formed in the end cover, the first boss protrudes along the direction that the end cover deviates from the electrode assembly, and the counter bore is located on one side of the end cover, facing the electrode assembly. In the embodiment of the application, the first boss is formed on the end cover, and the resistance of the end cover to stamping deformation is reduced by arranging the first sub-holes and the second sub-holes, so that the first boss can be stamped to a higher height on the end cover, and the rotation of the conductive assembly is limited. In an embodiment, a ratio of the depth of the first sub-hole to the thickness of the end cover is a first ratio, and the first ratio ranges from 0.2 to 0.5. In the embodiment of the application, the first boss is conveniently punched out to a proper height on the premise that the structural strength of the end cover at the first boss basically meets the requirement. In an embodiment, a minimum distance between a hole wall surface of the second sub-hole and an outer surface of the first boss is a preset distance, a ratio of the preset distance to a thickness of the end cover is a second ratio, and a range of the second ratio is 0.35-0.8. In the embodiment of the application, the strength of the first boss at the corner is basically satisfied, and the first boss can be conveniently punched to a proper he