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CN-122025650-A - Pole piece, battery cell, power utilization device and manufacturing method of battery cell

CN122025650ACN 122025650 ACN122025650 ACN 122025650ACN-122025650-A

Abstract

The application discloses a pole piece, an electric core, an electric device and a manufacturing method of the electric core. The pole piece comprises a current collector, wherein the current collector comprises a first conductive layer, a supporting layer and a second conductive layer which are stacked along a first direction, the supporting layer is provided with a first surface and a second surface which are opposite to each other along the first direction, the first conductive layer is connected with the first surface of the supporting layer, the second conductive layer is connected with the second surface of the supporting layer, the current collector further comprises a conductive member, the conductive member penetrates through the supporting layer along the first direction and is welded with the supporting layer, the first end of the conductive member is welded with the first conductive layer, and the second end of the conductive member is welded with the second conductive layer. According to the pole piece, the battery cell, the power utilization device and the manufacturing method of the battery cell, the electrode lug can be reliably connected with the first conductive layer and the second conductive layer while the whole occupied space of the electrode lug area is not increased, and the quality of the battery cell is improved.

Inventors

  • YAN JIAXIAO
  • LV FANG
  • WU HUA
  • QU CHANGMING

Assignees

  • 宁德新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20240930

Claims (15)

  1. 1. A pole piece, characterized in that the pole piece comprises a current collector: The current collector comprises a first conductive layer, a supporting layer and a second conductive layer which are stacked along a first direction; the support layer is provided with a first surface and a second surface which are opposite along the first direction; The first conductive layer is connected to the first surface; the second conductive layer is connected to the second surface; the current collector further comprises a conductive member penetrating through the supporting layer along the first direction, the first conductive layer and the second conductive layer are made of metal materials, and the supporting layer is made of insulating high polymer materials.
  2. 2. The pole piece of claim 1, wherein the conductive member is welded to the support layer, a first end of the conductive member is welded to the first conductive layer, and a second end of the conductive member is welded to the second conductive layer.
  3. 3. The pole piece of claim 2, wherein the conductive member is tapered, the first end having a dimension in a second direction that is greater than a dimension of the second end in the second direction, the first end having a dimension in a third direction that is greater than a dimension of the second end in the third direction; the first direction, the second direction and the third direction are perpendicular to each other.
  4. 4. A pole piece according to claim 2 or 3, characterized in that the end face of the first end is connected to the surface of the first conductive layer facing the support layer; Or, the end face of the first end protrudes from the first face of the supporting layer, and a part of the conductive member is inserted into the first conductive layer along the first direction; Or the conductive member penetrates through the first conductive layer along the first direction, and the end face of the first end is flush with the surface of the first conductive layer, which faces away from the supporting layer; or, the conductive member penetrates through the first conductive layer along the first direction, and the end face of the first end protrudes out of the surface of the first conductive layer, which is away from the supporting layer.
  5. 5. A pole piece according to claim 2 or 3, characterized in that the end face of the second end is connected to the surface of the second conductive layer facing the support layer; Or, an end face of the second end protrudes from the second face of the support layer, and a portion of the conductive member is inserted into the second conductive layer along the first direction; Or the conductive member penetrates through the second conductive layer along the first direction, and the end face of the second end is flush with the surface of the second conductive layer, which faces away from the supporting layer; Or, the conductive member penetrates through the second conductive layer along the first direction, and the end face of the second end protrudes out of the surface of the second conductive layer, which is away from the supporting layer.
  6. 6. A pole piece according to claim 3, wherein the conductive member extends through the first conductive layer in the first direction, the end face of the first end being flush with or protruding from the surface of the first conductive layer facing away from the support layer; the end face of the second end is in contact connection with the surface of the second conductive layer facing the supporting layer, or the end face of the second end protrudes out of the second surface of the supporting layer, and a part of the conductive member is inserted into the second conductive layer along the first direction.
  7. 7. The pole piece of claim 3, wherein the first end is connected to a surface of the first conductive layer facing the support layer, or wherein an end surface of the first end protrudes from the first surface of the support layer and a portion of the conductive member is inserted into the first conductive layer in the first direction; The conductive member penetrates through the second conductive layer along the first direction, and the end face of the second end is flush with or protrudes out of the surface of the second conductive layer, which faces away from the supporting layer.
  8. 8. The pole piece of claim 1, wherein the conductive member has a dimension in the first direction of 50 μιη to 90 μιη and the conductive member has a dimension in the second and third directions of 0.5 μιη to 3 μιη; the first direction, the second direction and the third direction are perpendicular to each other.
  9. 9. A battery cell, wherein the battery cell comprises: Tab and tab A pole piece according to any one of claims 1 to 8; The tab is welded to the first end or the second end of the conductive member.
  10. 10. The cell of claim 9, wherein the conductive member connects the tab in the first direction.
  11. 11. The cell of claim 9, wherein the conductive member is a burr structure protruding from the tab.
  12. 12. A method of manufacturing a cell, for manufacturing a cell as claimed in any one of claims 9 to 11, comprising: Arranging a supporting layer, wherein the supporting layer is provided with a first surface and a second surface which are opposite along a first direction; Providing a conductive member such that the conductive member extends through the support layer in the first direction, wherein a first end of the conductive member protrudes or is flush with the first surface, and a second end of the conductive member protrudes or is flush with the second surface; arranging a first conductive layer, and welding and connecting a first end of the conductive member with the first surface and the first conductive layer in a pressure fusion resistance welding mode; Arranging a second conductive layer, and welding and connecting a second end of the conductive member with the second surface and the second conductive layer in a pressure fusion resistance welding mode; And welding and fixing the tab and the conductive member by adopting a pressure fusion resistance welding mode.
  13. 13. The method of claim 12, wherein the first end of the conductive member is flush with or protrudes from a surface of the first conductive layer facing away from the support layer, and a portion of the conductive member extends through the first conductive layer; An end face of the second end of the conductive member is projected from the second face, and the conductive member is partially inserted into the second conductive layer.
  14. 14. The method of manufacturing a cell of claim 12, further comprising: and (3) deburring the tab to enable the tab to be convexly arranged on at least one side surface of the tab along the first direction to form burrs, wherein the burrs are used as the conductive members.
  15. 15. An electrical device comprising a pole piece according to any one of claims 1 to 8 or a cell according to any one of claims 9 to 11.

Description

Pole piece, battery cell, power utilization device and manufacturing method of battery cell The application is based on the application with the application number 202411388958.2, the application date 2024, the 09 month and 30, the application number Ning Dexin energy science and technology company, and the application name of 'pole piece, battery cell, power utilization device and manufacturing method of the battery cell'. Technical Field The application belongs to the technical field of batteries, and particularly relates to a pole piece, an electric core, an electric device and a manufacturing method of the electric core. Background The composite current collector is an important component of the pole piece and generally comprises an intermediate layer made of a high polymer material and metal layers positioned on two sides of the intermediate layer. In the process of manufacturing the battery core, the electrode lugs are required to be connected with two metal layers of the composite current collector so as to realize circuit conduction. How to improve the connection quality between the tab and the metal layer of the composite current collector is always the research direction in the industry. Disclosure of Invention In the related art, the tab is usually connected with the two metal layers through the external metal foil, but the whole occupied space of the tab area can be increased through the welding mode of metal foil switching, and meanwhile, the probability of overselding or cold welding is increased due to more welding positions, so that the quality of the battery cell is affected. Therefore, the embodiment of the application provides a pole piece, a battery cell, an electric device and a manufacturing method of the battery cell, which can reliably connect the pole lug with the first conductive layer and the second conductive layer while not increasing the whole occupied space of the pole lug area, and improve the quality of the battery cell. In one aspect, the embodiment of the application provides a pole piece, wherein the pole piece comprises a current collector, the current collector comprises a first conductive layer, a supporting layer and a second conductive layer, the first conductive layer, the supporting layer and the second conductive layer are stacked along a first direction, the supporting layer is provided with a first surface and a second surface which are opposite to each other along the first direction, the first conductive layer is connected with the first surface of the supporting layer, the second conductive layer is connected with the second surface of the supporting layer, the current collector further comprises a conductive member, the conductive member penetrates through the supporting layer along the first direction and is welded with the supporting layer, the first end of the conductive member is welded with the first conductive layer, and the second end of the conductive member is welded with the second conductive layer. In some embodiments, the conductive member has a tapered shape, the first end has a dimension along the second direction that is greater than the dimension along the second direction of the second end, the first end has a dimension along the third direction that is greater than the dimension along the third direction of the second end, and the first direction, the second direction, and the third direction are perpendicular to each other. In some embodiments, the end face of the first end is connected to a surface of the first conductive layer facing the support layer, or the end face of the first end protrudes from the first surface of the support layer and a portion of the conductive member is inserted into the first conductive layer in a first direction, or the conductive member penetrates the first conductive layer in the first direction, the end face of the first end is flush with a surface of the first conductive layer facing away from the support layer, or the conductive member penetrates the first conductive layer in the first direction, and the end face of the first end protrudes from a surface of the first conductive layer facing away from the support layer. In some embodiments, the end face of the second end is connected to a surface of the second conductive layer facing the support layer, or the end face of the second end protrudes from the second surface of the support layer and a portion of the conductive member is inserted into the second conductive layer along the first direction, or the conductive member penetrates the second conductive layer along the first direction, the end face of the second end is flush with a surface of the second conductive layer facing away from the support layer, or the conductive member penetrates the second conductive layer along the first direction, and the end face of the second end protrudes from a surface of the second conductive layer facing away from the support layer. In some embodiments, the conductive