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CN-122025525-A - Electrode assembly and preparation method

CN122025525ACN 122025525 ACN122025525 ACN 122025525ACN-122025525-A

Abstract

The invention relates to an electrode assembly and a preparation method thereof, wherein the preparation method comprises providing a pole and a sleeve, the sleeve comprises a cylinder, one end of the cylinder is provided with a flanging flange, the sleeve is made of 316L stainless steel, positioning the pole and the sleeve to enable the pole to be positioned in the sleeve, and filling glass powder between the pole and the sleeve to form an assembly, wherein the thermal expansion coefficient of the glass powder is as follows Heating the assembly to melt the glass powder and seal the pole and the sleeve together; and then cooling the assembly until the molten glass powder is completely solidified to form a glass ring. The invention also discloses an electrode assembly. The invention can improve the reliability and long-term stability of the sealing structure and reduce the damage risk.

Inventors

  • ZHONG DINGHUA
  • CHEN JINPENG
  • Han Shihan
  • 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 (11)

  1. 1. A method of manufacturing an electrode assembly, comprising: Providing a pole and a sleeve, wherein the sleeve comprises a cylinder body, a flanging flange is formed at one end of the cylinder body, the cylinder body and the flanging flange are of an integrated structure, the flanging flange is annular and is used for being welded with a shell of a battery, the sleeve is made of 316L stainless steel, the outer diameters of the top surface and the bottom surface of the pole are both larger than the outer diameter of the middle part, and the outer diameters of the pole are gradually and continuously increased from the middle part to the top surface and the bottom surface respectively; positioning the pole and the sleeve so that the pole is positioned in the sleeve, and filling glass powder or a glass powder prefabricated ring between the pole and the sleeve to form an assembly, wherein the thermal expansion coefficient of the glass powder is as follows The glass powder adopts a borosilicate system; heating the assembly to melt the glass powder to seal the pole and the sleeve together; And cooling the assembly until the melted glass powder is completely solidified to form a glass ring.
  2. 2. The method of manufacturing an electrode assembly according to claim 1, wherein the thermal expansion coefficient of the post is 。
  3. 3. The method of manufacturing an electrode assembly according to claim 2, wherein the electrode post is a nickel-based alloy electrode post, which is an iron-nickel-based alloy electrode post.
  4. 4. The method of manufacturing an electrode assembly according to claim 2, wherein the electrode post is an aluminum electrode post, and a surface of the aluminum electrode post is tin-plated.
  5. 5. The method for preparing an electrode assembly according to claim 1, wherein the borosilicate system used for the glass powder is composed of the following components in mass percent: 50%~70%、 10%~25%、 2% -10% and the balance of functional oxide.
  6. 6. The method of making an electrode assembly according to claim 5, wherein the functional oxide is one or more of CaO, znO, baO.
  7. 7. The method for manufacturing the electrode assembly according to claim 1, wherein the assembly is subjected to heating treatment to melt the glass powder, and a staged heating mode is adopted when the electrode post and the sleeve are sealed together, the staged heating mode comprises heating to 350-400 ℃ for preheating, slowly heating to 450-550 ℃ for melting and flowing the glass powder, and maintaining the temperature at 500-600 ℃ for 10-60 min for sufficiently wetting the outer wall of the electrode post and the inner wall of the sleeve by the melted glass powder.
  8. 8. The method for manufacturing an electrode assembly according to claim 1, wherein a metal transition layer is deposited on the surface of the electrode before the electrode is provided, and the metal transition layer is made of one or more materials selected from titanium and chromium.
  9. 9. The method for manufacturing an electrode assembly according to claim 1, wherein the glass ring is formed to have a height of not more than 0.5mm, and the glass ring has an inner diameter of 0.5 to 1.5mm.
  10. 10. The method for manufacturing an electrode assembly according to claim 1, wherein the wall thickness of the sleeve is 50-250 μm.
  11. 11. An electrode assembly prepared by the method of any one of claims 1-10.

Description

Electrode assembly and preparation method Technical Field The invention relates to the technical field of batteries, in particular to an electrode assembly and a preparation method thereof. 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. The electrode assembly generally comprises a pole, an insulating part is required to be arranged between the pole and a shell to ensure insulating sealing, a plastic piece is generally adopted as the insulating part, but the plastic piece is low in temperature resistance and poor in corrosion resistance, is easy to fail under thermal disturbance, humidity or long-term mechanical stress to influence the sealing insulating performance of the battery shell, and is difficult to meet the requirements of safety requirements and long-term use safety of the battery under high-power charging and discharging conditions. Disclosure of Invention Therefore, the technical problem to be solved by the invention is to improve the sealing reliability of the electrode assembly in the prior art. In order to solve the above technical problems, the present invention provides a method for preparing an electrode assembly, comprising: Providing a pole and a sleeve, wherein the sleeve comprises a cylinder body, a flanging flange is formed at one end of the cylinder body, and the sleeve is made of 316L stainless steel; Positioning the pole and the sleeve so that the pole is positioned in the sleeve, and filling glass powder between the pole and the sleeve to form an assembly, wherein the thermal expansion coefficient of the glass powder is as follows ; Heating the assembly to melt the glass powder to seal the pole and the sleeve together; And cooling the assembly until the melted glass powder is completely solidified to form a glass ring. In one embodiment of the invention, the thermal expansion coefficient of the pole is。 In one embodiment of the invention, the pole is a nickel-based alloy pole, which is an iron-nickel alloy pole. In one embodiment of the invention, the pole is an aluminum pole, the surface of which is tin plated. In one embodiment of the invention, the glass powder adopts a borosilicate system, and the borosilicate system consists of the following components in percentage by mass:50%~70%、10%~25%、 2% -10% and the balance of functional oxide. In one embodiment of the invention, the functional oxide is one or more of CaO, znO, baO. In one embodiment of the invention, the assembly is subjected to heating treatment to enable the glass powder to be melted, and a staged heating mode is adopted when the pole and the sleeve are sealed together, wherein the staged heating mode comprises the steps of heating to 350-400 ℃ for preheating, slowly heating to 450-550 ℃ for enabling the glass powder to start to melt and flow, and keeping the temperature at 500-600 ℃ for 10-60 min to enable the melted glass powder to fully wet the outer wall of the pole and the inner wall of the sleeve. In one embodiment of the invention, before the pole is provided, a metal transition layer is deposited on the surface of the pole, wherein the metal transition layer is made of one or more materials of titanium and chromium. In one embodiment of the invention, the height of the formed glass ring is not more than 0.5mm, and the inner diameter of the glass ring is 0.5-1.5 mm. In one embodiment of the invention, the wall thickness of the sleeve is 50-250 μm. The invention also discloses an electrode assembly prepared by adopting the preparation method of any one of the above. Compared with the prior art, the technical scheme of the invention has the following advantages: the preparation method and the electrode assembly can improve the combination reliability of glass, the sleeve and the electrode post, ensure the reliability and long-term stability of a sealing structure and reduce the damage risk. Drawings In order that the invention may be more readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings. Fig. 1 is a schematic view of a process for preparing an electrode assembly of the present invention; Fig. 2 is a schematic structural view of an electrode assembly of the present invention; FIG. 3 is a schematic view of another angle structure of the electrode assembly of FIG. 2; fig. 4 is a top view of the electrode assembly of fig. 2; FIG. 5 is a cross-sectional view at A-A in FIG. 4; Description of the specification reference numerals: 10. Electrode assembly, 101, pole, 102, glass ring, 103, sleeve, 1031, barrel, 1032 and flanging flange; Detailed Description The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will b