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CN-119447717-B - Output electrode, preparation method, battery and electric equipment

CN119447717BCN 119447717 BCN119447717 BCN 119447717BCN-119447717-B

Abstract

The application provides an output electrode, a preparation method, a battery and electric equipment, wherein the output electrode comprises a substrate and an insulating layer, the insulating layer is coated on part of the surface of the substrate, the insulating layer is made of modified polyphenylene sulfide resin and reinforcing agents distributed in the modified polyphenylene sulfide resin, and the reinforcing agents comprise sheet materials. According to the embodiment of the application, the reinforcing agent of the lamellar material is added, so that the dimensional stability of the polyphenylene sulfide resin is improved, the difference of dimensional contraction/expansion of the formed insulating layer and the substrate in all directions when the insulating layer and the substrate are subjected to cold and heat alternation is reduced, the consistency of dimensional contraction/expansion of the product in all directions is improved, the possibility of cracking of the product on a large scale is reduced, and the product performance is improved. And the sheet material has no obvious orientation, so that the situation that the formed insulating layer is stressed and deformed is reduced, and the product performance is further improved.

Inventors

  • LIU LEI
  • WANG FENG
  • PAN XIN
  • LIU YIFEI

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260512
Application Date
20230803

Claims (20)

  1. 1. An output pole, comprising: A substrate; An insulating layer coated on a part of the surface of the substrate; The insulation layer is made of modified polyphenylene sulfide resin and reinforcing agents distributed in the modified polyphenylene sulfide resin, the modified polyphenylene sulfide resin comprises toughening agent modified polyphenylene sulfide resin, the toughening agent modified polyphenylene sulfide resin is obtained by modifying the polyphenylene sulfide resin through a toughening agent, the toughening agent comprises ethylene-maleic anhydride-glycidyl methacrylate terpolymer, and the reinforcing agents are sheet materials.
  2. 2. The output pole of claim 1, wherein the microtopography of the sheet material comprises lamellar structures and/or lamellar structures.
  3. 3. The output pole of claim 2, wherein the sheet structure has a aspect ratio greater than or equal to 50.
  4. 4. An output pole according to claim 3, wherein the sheet-like structure has a aspect ratio of 50-100.
  5. 5. The output pole of claim 2, wherein the layered structure has a single layer aspect ratio greater than or equal to 50.
  6. 6. The output pole of claim 5, wherein the layered structure has a single layer aspect ratio of 50-100.
  7. 7. The output electrode of claim 1, wherein the sheet material has an average particle size of less than or equal to 2 μm.
  8. 8. The output electrode of claim 7, wherein the sheet material has an average particle size of less than or equal to 1.6 μm.
  9. 9. The output pole of claim 1, wherein the platelet material comprises one or both of talc and mica.
  10. 10. The output electrode according to claim 1, wherein the polyphenylene sulfide resin has a number average molecular weight of 50000-70000.
  11. 11. The output electrode according to claim 10, wherein the polyphenylene sulfide resin has a number average molecular weight of 50000 to 60000.
  12. 12. The output electrode of claim 1, wherein the mass ratio of the toughening agent to the polyphenylene sulfide resin is 5-30:100.
  13. 13. The output electrode of claim 12, wherein the mass ratio of the toughening agent to the polyphenylene sulfide resin is 5-10:100.
  14. 14. The output pole of claim 12, wherein the mass ratio of the sheet material to the polyphenylene sulfide resin is 10-60:100.
  15. 15. The output pole of claim 14, wherein the mass ratio of the sheet material to the polyphenylene sulfide resin is 15-30:100.
  16. 16. The output pole of claim 1, wherein the absolute value of the difference between the linear expansion coefficient of the material of the insulating layer and the linear expansion coefficient of the material of the substrate in the flow direction or the perpendicular flow direction is less than or equal to 50 x 10 - 6 m/m°c.
  17. 17. The output pole of claim 16, wherein the insulating layer material has a linear expansion coefficient of 25 x 10 -6 m·℃-93×10 -6 m°c in the flow direction.
  18. 18. The output pole of claim 17, wherein the insulating layer material has a linear expansion coefficient of 38 x 10 -6 m/m·℃-65×10 -6 m/m°c in the flow direction.
  19. 19. The output pole of claim 16, wherein the insulating layer material has a linear expansion coefficient of 29 x 10 -6 m·℃-97×10 -6 m°c along the vertical flow direction.
  20. 20. The output pole of claim 19, wherein the insulating layer material has a linear expansion coefficient of 34 x 10 -6 m/m·℃-69×10 -6 m/m°c along the vertical flow direction.

Description

Output electrode, preparation method, battery and electric equipment Technical Field The invention relates to the technical field of batteries, in particular to an output electrode, a preparation method, a battery and electric equipment. Background This section provides merely background information related to the application, which is not necessarily prior art. With the rapid development of the current society, the demand of green new energy and high-performance energy storage equipment is more and more urgent. Batteries have been widely used in the fields of portable electronic devices, power automobiles, and the like as a new generation of green energy storage and conversion devices. The battery generally comprises a plurality of battery cells, and the plurality of battery cells can be connected in series, in parallel or in series through a conductive structure. The conductive structure is required to have the conductivity for realizing the function of transmitting electric energy, and is required to have no problem of electric leakage or short circuit. Insulating treatment is required to be carried out on the non-conductive functional area of the conductive structure, and good product stability is required to be maintained between the insulating layer of the conductive structure and the conductive substrate when the conductive substrate is subjected to cold and heat alternation. Disclosure of Invention The application mainly solves the technical problem that good product stability is still maintained between an insulating layer and a conductive substrate of a conductive structure in a battery when the insulating layer and the conductive substrate are subjected to cold and heat alternation. In a first aspect, embodiments of the present application provide an output pole comprising: A substrate; An insulating layer coated on a part of the surface of the substrate; The insulating layer is made of modified polyphenylene sulfide resin and reinforcing agents distributed in the modified polyphenylene sulfide resin, wherein the reinforcing agents comprise sheet materials. According to the embodiment of the application, the reinforcing agent of the lamellar material is added, so that the dimensional stability of the polyphenylene sulfide resin is improved, the difference of dimensional contraction/expansion of the formed insulating layer and the substrate in all directions when the insulating layer and the substrate are subjected to cold and heat alternation is reduced, the consistency of dimensional contraction/expansion of the product in all directions is improved, the possibility of cracking of the product on a large scale is reduced, and the product performance is improved. And the sheet material has no obvious orientation, so that the situation that the formed insulating layer is stressed and deformed is reduced, and the product performance is further improved. In some embodiments, the microstructure of the sheet material comprises a sheet structure and/or a microstructure; Optionally, the aspect ratio of the sheet structure is greater than or equal to 50, optionally 50-100; Alternatively, the monolayer aspect ratio of the layered structure is greater than or equal to 50, optionally from 50 to 100. Wherein the sheet structure is one of the sheet structures. In any embodiment, the aspect ratio of the sheet structure may be 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, or a range of any two values, for example, the aspect ratio of the sheet structure may be 50-80, 60-70, or 70-100, etc. In the above range, the polyphenylene sulfide resin has larger specific surface area and better controllability, is beneficial to improving the dimensional stability of the polyphenylene sulfide resin, and reduces the difference of dimensional contraction/expansion of the formed insulating layer and the substrate in all directions when the insulating layer and the substrate are subjected to cold and heat alternation. Wherein the layered structure refers to another of the laminated structures, and is a material in which two or more laminated structures are laminated together. In any embodiment, the single layer aspect ratio of the layered structure may be 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100, or a range of any two values described above, e.g., the single layer aspect ratio of the layered structure may be 50-80, 60-70, or 70-100, etc. In the above range, the polyphenylene sulfide resin has larger specific surface area and better controllability, is beneficial to improving the dimensional stability of the polyphenylene sulfide resin, and reduces the difference of dimensional contraction/expansion of the formed insulating layer and the substrate in all directions when the insulating layer and the substrate are subjected to cold and heat alternation. In some embodiments, the average particle size of the sheet material is less than or equal to 2 μm, optionally less than or equal to 1.6 μm. In any embodiment, the average partic