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CN-121986394-A - Power consumption device, battery cell and manufacturing method thereof

CN121986394ACN 121986394 ACN121986394 ACN 121986394ACN-121986394-A

Abstract

A battery cell includes a housing, an electrode assembly, a support member, and an insulating member. The case has a first wall, the electrode assembly is accommodated in the case, and the support member is disposed between the electrode assembly and the first wall. The electrode assembly comprises an electrode assembly, a support, at least part of an insulating piece, at least part of a welding impression, or a support, wherein the insulating piece is arranged between the electrode assembly and the support, the support is connected with the insulating piece in a welding way, the welding impression is formed on the support, the at least part of the insulating piece is arranged between the electrode assembly and the support, the at least part of the welding impression exposes the surface of the support, which is opposite to the insulating piece, or the support is arranged between the insulating piece and the electrode assembly, and the at least part of the welding impression is positioned on the surface of the insulating piece, which is opposite to the support. The battery monomer provided by the embodiment is beneficial to reducing the risk that welding slag enters the electrode assembly to damage the electrode assembly, reducing the risk that lithium is separated from the electrode assembly, and improving the reliability of the battery monomer.

Inventors

  • KE HAIBO
  • JIN HAIZU
  • ZHENG YULIAN
  • HUANG SHOUJUN
  • LIU YUTING
  • HUANG BINGSEN

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260505
Application Date
20240624

Claims (17)

  1. A battery cell comprising: A housing having a first wall; an electrode assembly accommodated in the case; A support member provided between the electrode assembly and the first wall; The support piece is welded with the insulating piece and is provided with a welding mark; At least part of the insulating member is arranged between the electrode assembly and the supporting member, at least part of the welding mark is positioned on the surface of the supporting member facing away from the insulating member, or The support member is arranged between the insulating member and the electrode assembly, and at least part of the welding marks are positioned on the surface of the insulating member, which is opposite to one side of the support member.
  2. The battery cell according to claim 1, wherein at least a part of the insulating member is provided between the electrode assembly and the support member, all of the welding marks are located on a surface of the insulating member on a side facing away from the support member, or the support member is provided between the insulating member and the electrode assembly, all of the welding marks are located on a surface of the support member on a side facing away from the insulating member.
  3. The battery cell according to claim 1, wherein at least a portion of the insulating member is disposed between the electrode assembly and the support member, the support member has a first surface facing away from the insulating member, the insulating member has a second surface facing away from the support member, a surface roughness of a region of the first surface corresponding to the weld bead is greater than a surface roughness of a region of the second surface corresponding to the weld bead, or the support member is disposed between the insulating member and the electrode assembly, the insulating member has a third surface facing away from the support member, the support member has a fourth surface facing away from the insulating member, and a surface roughness of a region of the third surface corresponding to the weld bead is greater than a surface roughness of a region of the fourth surface corresponding to the weld bead.
  4. The battery cell according to claim 1, wherein at least a portion of the insulating member is disposed between the electrode assembly and the support member, the thickness of the support member being less than the thickness of the insulating member.
  5. The battery cell of any one of claims 1-4, wherein the weld footprint comprises a plurality of welds, the plurality of welds being spaced apart.
  6. The battery cell according to claim 5, wherein at least a part of the insulating member is provided between the electrode assembly and the supporting member, the supporting member has a first welding region provided around the welding mark, a maximum distance d between the first welding region and the welding mark is d≤3 mm, a thickness of the first welding region is T2, and a thickness of a portion of the insulating member opposite to the first welding region is T1, T2≤15T1.
  7. The battery cell of claim 6, wherein T2 is 10T1.
  8. The battery cell according to any one of claims 1 to 4, wherein the weld footprint is recessed inwardly from a circumferential side of the weld footprint.
  9. The battery cell of claim 8, wherein the weld footprint is in the shape of a bar.
  10. The battery cell according to claim 8, wherein at least a part of the insulating member is provided between the electrode assembly and the support member, the support member has a first welding region provided around the welding mark, a maximum distance d between the first welding region and the welding mark is d≤3 mm, a thickness of the first welding region is T2, and thicknesses T1, T2≤ 1.2T1 of portions of the insulating member opposite to the first welding region.
  11. The battery cell according to any one of claims 1 to 10, wherein the support member and the insulating member are formed with a plurality of the welding marks, the plurality of welding marks being spaced apart.
  12. The battery cell according to any one of claims 1 to 11, wherein the weld marks are provided extending in a first direction and a second direction, the first direction, the second direction, and a thickness direction of the first wall are perpendicular to each other, a dimension L1 of the weld marks in the first direction satisfies 0.5mm +.l1 +.30mm, and/or a dimension L2 of the weld marks in the second direction satisfies 0.5mm +.l2 +.30mm.
  13. The battery cell according to any one of claims 1 to 12, wherein an area S of the welding mark in front projection of the first wall in a thickness direction of the first wall satisfies S≥4 mm 2 .
  14. A method of manufacturing a battery cell, comprising: providing an insulator and a support; Welding the insulating piece with the supporting piece to form a welding mark; And coating the insulating part on the surface of the electrode assembly, wherein at least part of the insulating part is arranged between the electrode assembly and the supporting part, at least part of the welding mark is positioned on the surface of one side of the supporting part, which is opposite to the insulating part, or the supporting part is arranged between the insulating part and the electrode assembly, and at least part of the welding mark is positioned on the surface of one side of the insulating part, which is opposite to the supporting part.
  15. The method of manufacturing a battery cell according to claim 14, wherein the welding the insulating member to the supporting member comprises: And welding the insulating piece and the supporting piece by adopting an ultrasonic welding method.
  16. A battery comprising the battery cell according to any one of claims 1 to 13, or comprising a battery cell manufactured by the manufacturing method of the battery cell according to claim 14 or 15.
  17. An electrical device comprising the battery of claim 16 for providing electrical energy.

Description

Power consumption device, battery cell and manufacturing method thereof Technical Field The present application relates to the field of battery technology, and more particularly, to an electric device, a battery cell, and a method of manufacturing the same. Background Batteries 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 In the development of battery technology, in addition to improving the service performance of a battery cell, how to improve the reliability of the battery cell is also a non-negligible problem. Therefore, how to improve the reliability of the battery cell is a technical problem of continuous improvement in the battery technology. Disclosure of Invention The application provides an electric device, a battery cell and a manufacturing method thereof, so as to improve the reliability of the battery cell. 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, a support member, and an insulating member. The case has a first wall, the electrode assembly is accommodated in the case, and the support member is disposed between the electrode assembly and the first wall. The support member is welded with the insulating member and is provided with a welding impression, at least part of the insulating member is arranged between the electrode assembly and the support member, at least part of the welding impression is positioned on the surface of the support member, which is opposite to the side of the insulating member, or the support member is arranged between the insulating member and the electrode assembly, and at least part of the welding impression is positioned on the surface of the insulating member, which is opposite to the side of the support member. According to the battery monomer provided by the embodiment of the application, the welding mark formed by welding connection of the insulating piece and the supporting piece is arranged on the surface of one side of the supporting piece, which is opposite to the insulating piece, or the welding mark is arranged on one side of the insulating piece, which is opposite to the supporting piece, so that in the welding process of the insulating piece and the supporting piece, one side of the supporting piece, which is opposite to the electrode assembly, can be welded, or one side of the insulating piece, which is opposite to the electrode assembly, can be welded, welding slag and the welding mark formed in the welding process are arranged on one side of the supporting piece, which is opposite to the electrode assembly, or one side of the insulating piece, which is opposite to the electrode assembly, so that the risk that the welding slag enters the electrode assembly to damage the electrode assembly is reduced, the risk that the welding mark damages the electrode assembly is reduced, and the risk that lithium is separated from the electrode assembly is reduced, and the reliability of the battery monomer is improved. According to some embodiments of the application, at least part of the insulating member is arranged between the electrodes and the support member, all the welding marks are positioned on the surface of the insulating member on the side facing away from the support member, or the support member is arranged between the insulating member and the electrode assembly, and all the welding marks are positioned on the surface of the support member on the side facing away from the insulating member. In the scheme, after the insulating part is coated on the surface of the electrode assembly, the risk of lithium precipitation or decarburization of the electrode assembly caused by extrusion of the electrode assembly by the welding mark is reduced, and the reliability of the battery cell is further improved. According to some embodiments of the application, at least a portion of the insulator is disposed between the electrode assembly and the support member, the support member has a first surface facing away from the insulator, the insulator has a second surface facing away from the support member, and a surface roughness of a region of the first surface corresponding to the weld footprint is greater than a surface roughness of a region of the second surface corresponding to the weld footprint, or the support member is disposed between the insulator and the electrode assembly, the insulator has a third surface facing away from the support member, the support member has a fourth surface facing away from the insulator, and a surface roughness of a region of the third surface corresponding to the weld footprint is greater than a surface roughness of a region of the fourth surface corresponding to the weld footprint. In the above scheme, in th