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CN-122025526-A - Electrode assembly and preparation method

CN122025526ACN 122025526 ACN122025526 ACN 122025526ACN-122025526-A

Abstract

The invention relates to an electrode assembly and a preparation method thereof, wherein the preparation method comprises the steps of providing a pole, and carrying out surface activation treatment on the pole; the method comprises the steps of forming an oxide film layer on the surface of a pole, plating a metal transition layer on the surface of the oxide film layer, placing the pole inside a sleeve, and sealing the pole and the sleeve through a glass ring. The invention also discloses an electrode assembly. The invention can obviously improve the bonding strength between the pole and the glass ring in the electrode assembly, and improve the structural strength and air tightness of the electrode assembly, thereby better ensuring the reliability and safety of long-term use of the product.

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 (11)

  1. 1. A method for preparing an electrode assembly is characterized by comprising the steps of, Providing a pole, and carrying out surface activation treatment on the pole; So that an oxide film layer is formed on the surface of the pole; Plating a metal transition layer on the surface of the oxide film layer; The pole is arranged inside the sleeve, and the pole and the sleeve are sealed by a glass ring.
  2. 2. The method of manufacturing an electrode assembly according to claim 1, further comprising roughening the surface of the electrode post to form a roughened layer before the surface activation treatment.
  3. 3. The method of manufacturing an electrode assembly according to claim 1, wherein the roughening the surface of the post comprises roughening the surface of the post in a micrometer/submicron order such that the surface of the post forms a plurality of pits to form a roughened layer.
  4. 4. The method of manufacturing an electrode assembly according to claim 1, wherein the thickness of the oxide film layer is 10 to 200nm.
  5. 5. The method of manufacturing an electrode assembly according to claim 1, wherein the method of forming an oxide film layer on the surface of the electrode post comprises placing the electrode post in an oxygen atmosphere to form a nickel oxide layer on the surface of the electrode post as an oxide film layer or placing the electrode post in a wet hydrogen atmosphere to form an aluminum oxide layer on the surface of the electrode post as an oxide film layer.
  6. 6. The method of claim 1, wherein the metal transition layer is made of one or more of chromium, titanium, molybdenum, nickel or nickel-phosphorus alloy.
  7. 7. The method for manufacturing an electrode assembly according to claim 1, wherein a metal transition layer is plated on the surface of the oxide film layer by electroplating, magnetron sputtering plating or chemical plating, and the thickness of the plated metal transition layer is 50-500 nm.
  8. 8. The method for manufacturing an electrode assembly according to claim 1, wherein the sealing between the electrode post and the sleeve through the glass ring comprises the steps of placing the electrode post inside the sleeve, arranging the glass ring between the electrode post and the sleeve to form an assembly, and placing the assembly in a heating furnace for heating and sealing, wherein the sealing temperature is 400-600 ℃.
  9. 9. The method of manufacturing an electrode assembly according to claim 3, wherein the width of the recess is 2 to 5. Mu.m.
  10. 10. The method of manufacturing an electrode assembly according to claim 1, wherein the electrode column is a nickel column or an aluminum column, and the glass ring is a silicate glass ring.
  11. 11. An electrode assembly prepared by the method of any one of claims 1 to 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 structural reliability and safety of the electrode assembly. In order to solve the technical problems, the present invention provides a method for preparing an electrode assembly, comprising, Providing a pole, and carrying out surface activation treatment on the pole; So that an oxide film layer is formed on the surface of the pole; Plating a metal transition layer on the surface of the oxide film layer; The pole is arranged inside the sleeve, and the pole and the sleeve are sealed by a glass ring. In one embodiment of the present invention, before the surface activation treatment is performed on the pole, a roughening treatment is further performed on the pole surface to form a roughened layer. In one embodiment of the present invention, the roughening method for the surface of the electrode post includes roughening the surface of the electrode post in a micron/submicron order so that the surface of the electrode post forms a plurality of pits to form a roughened layer. In one embodiment of the present invention, the thickness of the oxide film layer is 10 to 200nm. In one embodiment of the present invention, the method for forming an oxide film layer on the surface of a polar post includes placing the polar post in an oxygen atmosphere so that a nickel oxide layer is formed on the surface of the polar post as an oxide film layer, or placing the polar post in a wet hydrogen atmosphere so that an aluminum oxide layer is formed on the surface of the polar post as an oxide film layer. In one embodiment of the present invention, the metal transition layer is made of one or more materials selected from chromium, titanium, molybdenum, nickel or nickel-phosphorus alloy. In one embodiment of the present invention, when the metal transition layer is plated on the surface of the oxide film layer, an electroplating method, a magnetron sputtering plating method or an electroless plating method is adopted, and the thickness of the plated metal transition layer is 50-500 nm. In one embodiment of the invention, the method for sealing the polar post and the sleeve through the glass ring comprises the steps of placing the polar post in the sleeve, arranging the glass ring between the polar post and the sleeve to form an assembly, and placing the assembly in a heating furnace for heating and sealing, wherein the sealing temperature is 400-600 ℃. In one embodiment of the present invention, the pit has a width of 2 to 5 μm. In one embodiment of the invention, the pole is a nickel pole or an aluminum pole, and the glass ring is a silicate glass ring. The invention also discloses an electrode assembly, which is prepared by adopting the preparation method of any one of the above. Compared with the prior art, the preparation method and the electrode assembly have the advantages that the bonding strength between the electrode post and the glass ring in the electrode assembly can be remarkably improved, and the structural strength and the air tightness of the electrode assembly are improved, so that the reliability and the safety of long-term use of the product are better ensured. 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 structural view of an electrode assembly of the present invention; FIG. 2 is a schematic view of an alternative angle structure of the electrode assembly of FIG. 1; FIG. 3 is a top view of the electrode assembly of FIG. 1; FIG. 4 is a cross-sectional view at A-A in FIG. 3; FIG. 5 is an enlarged view of a portion of FIG. 4 at M3; fig. 6 is a schematic view of a process for preparing an electrode assembly of the present invention; FIG. 7 is an enlarged view of a portion of FIG. 6 at M4; Description of the specification re