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CN-122026030-A - Hollow sleeve, preparation method, electrode assembly and quality tracing system

CN122026030ACN 122026030 ACN122026030 ACN 122026030ACN-122026030-A

Abstract

The invention relates to a hollow sleeve, a preparation method, an electrode assembly and a quality tracing system, wherein the sleeve comprises a cylinder, and a flanging flange is formed at one end of the cylinder; the inner wall of the cylinder body is provided with a guide groove, and the guide groove is arranged around the axis of the cylinder body. The invention also discloses a preparation method of the sleeve, an electrode assembly and a quality tracing system. The invention is beneficial to improving the sealing reliability of the electrode assembly.

Inventors

  • ZHONG DINGHUA
  • CHEN JINPENG
  • FU JINGQIN
  • CHEN HAIFENG

Assignees

  • 苏州中科瑞龙科技有限公司

Dates

Publication Date
20260512
Application Date
20260410

Claims (16)

  1. 1. The hollow sleeve is characterized by comprising a barrel, wherein a flanging flange is formed at one end of the barrel, a guide groove is formed in the inner wall of the barrel, the guide groove is arranged around the axis of the barrel, a pole column is contained in the sleeve, the sleeve and the pole column are in fusion sealing through a glass ring, and the guide groove can provide a gas escape path in the fusion or flow stage of the glass ring.
  2. 2. The hollow sleeve of claim 1 wherein said guide groove is a continuous annular groove.
  3. 3. The hollow sleeve of claim 1, wherein a plurality of said guide grooves are provided on the inner wall of said barrel, said guide grooves being circumferentially and uniformly distributed about the axis of said barrel.
  4. 4. The hollow sleeve of claim 1, wherein the guide groove has a depth of 0.02-0.08 mm.
  5. 5. The hollow sleeve of claim 1, wherein the guide slot has a width of 0.05-0.2 mm.
  6. 6. The hollow sleeve of claim 1, wherein the barrel and the flange are connected by an arc fillet, and the radius of the arc fillet is 0.02-0.1 mm.
  7. 7. The hollow sleeve of claim 1 wherein said barrel inner wall is adjacent to an end linear stress buffer of said flange.
  8. 8. The hollow sleeve of claim 7, wherein the linear stress buffer is corrugated, the linear stress buffer having a wave amplitude of 0.02-0.06 mm and a wave pitch of 0.1-0.3 mm.
  9. 9. The hollow sleeve of claim 7, wherein the linear stress buffer is a thinned band having a depth of thinning of 0.1 to 0.4 times the thickness of the barrel.
  10. 10. The hollow sleeve of claim 1, wherein the flange has a first surface and a second surface disposed opposite to each other, the first surface is provided with a first groove, a distance between the first surface and the second surface is a first thickness, and a depth of the first groove is 0.2-0.4 times the first thickness.
  11. 11. The hollow sleeve of claim 10, wherein the first thickness is 0.12-0.18 mm.
  12. 12. The hollow sleeve of claim 1, wherein the inner diameter of the barrel is 0.5-2.25 mm.
  13. 13. The hollow sleeve of claim 1 wherein said barrel and flange are integrally formed.
  14. 14. A method of manufacturing a hollow sleeve according to any one of claims 1 to 13, comprising the steps of: The sleeve is prepared by a stretch forming process, so that a cylinder body and a flanging flange of the sleeve are integrally formed; a guide groove is processed and obtained at the inner wall of the cylinder body; And (3) annealing the sleeve with the guide groove.
  15. 15. An electrode assembly comprising the sleeve of any one of claims 1-13, a post and a glass ring, the post being positioned within the sleeve, the sleeve and the post being sealed with the glass ring.
  16. 16. The quality tracing system of an electrode assembly of claim 15, wherein a unique product code is provided on said flange, said quality tracing system is configured to collect said product code, and retrieve production data corresponding to said product code from a production database via said product code to implement a tracing management.

Description

Hollow sleeve, preparation method, electrode assembly and quality tracing system Technical Field The invention relates to the technical field of batteries, in particular to a hollow sleeve, a preparation method, an electrode assembly and a quality tracing system. Background The electrode assembly in the battery is disposed on the case to electrically connect the internal electric core of the case with external electric components through the electrode assembly. In addition, the electrode assembly generally comprises a pole column, an insulating piece is required to be arranged between the pole column and the shell to ensure insulating sealing, a plastic piece is generally adopted as the insulating piece, but the plastic piece is low in temperature resistance and poor in corrosion resistance, failure is easy to occur under thermal disturbance, humidity or long-term mechanical stress to influence the sealing insulating performance of the battery shell, the requirements of safety requirements and long-term use safety of the battery under high-power charge and discharge conditions are difficult to meet, glass can be used for replacing the plastic piece to seal the pole column for improving the problems, for example, the pole column can be placed in a straight barrel type sleeve body and sealed by glass, but the sleeve body with the structure is easy to improve the reliability and the yield of a sealing structure due to poor air tightness and failure phenomenon caused by the generation of a sealing interface of the sleeve body and glass due to stress concentration, glass flow limitation and the like in the sealing process or the subsequent thermal cycle test of the glass. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to improve the sealing reliability of the electrode assembly. In order to solve the technical problems, the invention provides a hollow sleeve, which comprises a cylinder body, wherein a flanging flange is formed at one end of the cylinder body, a guide groove is formed in the inner wall of the cylinder body, and the guide groove is arranged around the axis of the cylinder body. In one embodiment of the invention, the guide groove is a continuous annular groove. In one embodiment of the invention, a plurality of guide grooves are arranged on the inner wall of the cylinder body, and the guide grooves are uniformly distributed circumferentially around the axis of the cylinder body. In one embodiment of the present invention, the depth of the guide groove is 0.02 to 0.08mm. In one embodiment of the present invention, the width of the guide groove is 0.05 to 0.2mm. In one embodiment of the invention, the cylinder body and the flanging flange are connected through an arc fillet, and the radius of the arc fillet is 0.02-0.1 mm. In one embodiment of the invention, the inner wall of the barrel is adjacent to an end of the flange. In one embodiment of the invention, the linear stress buffer is corrugated, the amplitude of the corrugated linear stress buffer is 0.02-0.06 mm, and the wave distance is 0.1-0.3 mm. In one embodiment of the present invention, the linear stress buffer region is a thinned band, and the thinned depth of the thinned band is 0.1 to 0.4 times the thickness of the cylinder. In one embodiment of the invention, the flanging flange is provided with a first surface and a second surface which are oppositely arranged, the first surface is provided with a first groove, the distance between the first surface and the second surface is a first thickness, and the depth of the first groove is 0.2-0.4 times of the first thickness. In one embodiment of the present invention, the first thickness is 0.12 to 0.18mm. In one embodiment of the invention, the inner diameter of the cylinder is 0.5-2.25 mm. In one embodiment of the invention, the barrel and the flange are integrally formed. The invention also discloses a preparation method of the hollow sleeve, which comprises the following steps: The sleeve is prepared by a stretch forming process, so that a cylinder body and a flanging flange of the sleeve are integrally formed; a guide groove is processed and obtained at the inner wall of the cylinder body; And (3) annealing the sleeve with the guide groove. The invention also discloses an electrode assembly, which comprises the sleeve, the pole and the glass ring, wherein the pole is positioned in the sleeve, and the sleeve and the pole are sealed by the glass ring. In one embodiment of the present invention, in the above quality tracing system, a unique product code is set on the flange, and the quality tracing system is configured to collect the product code, and retrieve, from a production database, production data corresponding to the product code through the product code to implement tracing management. Compared with the prior art, the technical scheme of the invention has the following advantages: According to the hollow sleeve and the electrode assembly, t