CN-122026031-A - Electrode assembly and preparation method

Abstract

The invention relates to an electrode assembly and a preparation method thereof, wherein the method comprises the steps of providing a pole column and a sleeve, wherein the sleeve comprises a cylinder body, and a flanging flange is formed at one end of the cylinder body; the method comprises the steps of positioning a pole and a sleeve, arranging a glass ring between the pole and the sleeve to form an assembly, placing the assembly in a heating furnace to heat the glass ring to melt the glass ring to seal the pole and the sleeve together, annealing the assembly, and cooling the assembly until the glass ring is cooled to room temperature after annealing to completely solidify the melted glass ring. The invention also discloses an electrode assembly. The invention can effectively improve the preparation efficiency and quality of the electrode assembly and ensure the sealing reliability and air tightness 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 (13)

1. 1. A method of manufacturing an electrode assembly, comprising: Providing a pole and a sleeve, wherein the outer diameters of the top surface and the bottom surface of the pole are larger than the outer diameter of the middle part of the pole, the sleeve comprises a cylinder, and a flanging flange is formed at one end of the cylinder; Positioning the pole and the sleeve so that the pole is positioned in the sleeve, and arranging a glass ring between the outer wall of the pole and the inner wall of the sleeve to form an assembly, wherein the glass ring is a prefabricated annular glass body or is filled with glass powder; placing the assembly in a heating furnace for heating treatment so that the glass ring is melted to seal the pole and the sleeve together; For the assembly body annealing treatment is carried out; After annealing treatment, the assembly is cooled until the assembly is cooled to room temperature, so that the molten glass ring is completely solidified, the top surface of the solidified glass ring is flush with the top surface of the sleeve, the bottom surface of the glass ring is flush with the bottom surface of the sleeve, and the flanging flange is used for welding with the shell of the battery.
2. 2. The method of manufacturing an electrode assembly according to claim 1, wherein the electrode post and the sleeve are positioned such that they are coaxially disposed.
3. 3. The method of manufacturing an electrode assembly according to claim 1, wherein the heating process to melt the glass ring to seal the electrode post and the sleeve together comprises raising the temperature of the heating furnace to 420-480 ℃ at a rate of 5-15 ℃ per minute and maintaining the temperature for a first period of time to melt the glass ring to flow and wet the outer wall of the electrode post and the inner wall of the sleeve, thereby sealing the electrode post and the sleeve together through the molten glass ring member.
4. 4. The method of manufacturing an electrode assembly according to claim 3, wherein the first period of time is 3 to 30 minutes.
5. 5. The method of manufacturing an electrode assembly according to claim 1, wherein the annealing treatment of the assembly body includes reducing the temperature of the heating furnace to 250-350 ℃ at a rate of 1-5 ℃ per minute and maintaining the temperature for a second period of time.
6. 6. The method of manufacturing an electrode assembly according to claim 5, wherein the second period of time is 10 to 60 minutes.
7. 7. The method for producing an electrode assembly according to claim 1, wherein the assembly is placed in a heating furnace, the heating furnace is further subjected to a vacuum-pumping treatment, and after the vacuum-pumping treatment, the degree of vacuum in the heating furnace is Torr。
8. 8. The method for producing an electrode assembly according to claim 1, wherein an inert gas is further introduced into the heating furnace to form an inert atmosphere before the assembly is heated in the heating furnace.
9. 9. 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 thickness of the metal transition layer is 10-200 nm.
10. 10. The method for manufacturing an electrode assembly according to claim 9, wherein the metal transition layer is made of one or more materials selected from titanium and chromium.
11. 11. The method of manufacturing an electrode assembly according to claim 1, wherein the glass ring is borosilicate glass.
12. 12. The method of manufacturing an electrode assembly according to claim 1, wherein the sleeve is made of stainless steel, and the post is made of one or more of aluminum, nickel, and nickel-based alloy.
13. 13. An electrode assembly prepared by the method of any one of claims 1-12.

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 invention aims to solve the technical problem of improving the preparation efficiency and the preparation quality 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, and a flanging flange is formed at one end of the cylinder; Positioning the pole and the sleeve so that the pole is positioned in the sleeve, and arranging a glass ring between the pole and the sleeve to form an assembly; placing the assembly in a heating furnace for heating treatment so that the glass ring is melted to seal the pole and the sleeve together; For the assembly body annealing treatment is carried out; After the annealing treatment, the assembly is cooled until the assembly is cooled to room temperature, so that the molten glass ring is completely solidified. In one embodiment of the invention, the pole and the sleeve are positioned such that they are coaxially disposed. In one embodiment of the invention, the method of heat treating to melt the glass ring to seal the pole and sleeve together includes raising the temperature of the furnace to 420-480 ℃ at a rate of 5-15 ℃ per minute and maintaining the temperature for a first period of time to melt the glass ring to flow and wet the outer wall of the pole and the inner wall of the sleeve so that the pole and sleeve are sealed together by the molten glass ring. In one embodiment of the present invention, the first duration is 3 to 30 minutes. In one embodiment of the invention, the method for annealing the assembly comprises the steps of reducing the temperature of a heating furnace to 250-350 ℃ at a speed of 1-5 ℃ per minute, and preserving the heat for a second period of time. In one embodiment of the present invention, the second time period is 10 to 60 minutes. In one embodiment of the present invention, the assembly is placed in a heating furnace, and the heating furnace is further subjected to a vacuum treatment, and after the vacuum treatment, the vacuum degree in the heating furnace isTorr。 In one embodiment of the present invention, the assembly is placed in a heating furnace and an inert gas is introduced into the heating furnace to form an inert atmosphere before the heating treatment. In one embodiment of the invention, before the pole is provided, a metal transition layer is deposited on the surface of the pole, and the thickness of the metal transition layer is 10-200 nm. In one embodiment of the present invention, the metal transition layer is made of one or more materials of titanium and chromium. In one embodiment of the present invention, the glass ring is made of borosilicate glass. In one embodiment of the invention, the sleeve is made of stainless steel, and the pole is made of one or more of aluminum, nickel and nickel-based alloy. 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 electrode assembly and the preparation method thereof can effectively improve the preparation efficiency and quality of the electrode assembly and ensure the sealing reliability and air tightness of the electrode assembly. 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 view of an electrode assembly of the present invention when subjected to a seal test; Fig. 3 is a schematic structural view of an electrode assembly of the present invention; FIG. 4 is a schematic view of another angle structure o