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CN-224217679-U - Insulating film, electrode group structure and battery monomer

CN224217679UCN 224217679 UCN224217679 UCN 224217679UCN-224217679-U

Abstract

The utility model belongs to the technical field of batteries, and discloses an insulating film, a pole group structure and a battery monomer, wherein the insulating film comprises a first coating part and a second coating part, the first coating part is used for coating the bottom surface of a pole group, the second coating part surrounds and is fixed on the periphery of the first coating part, the second coating part is used for coating all side walls of the pole group, and the second coating part has plasticity and thermoplasticity, and the insulating film can be used as a whole to be coated on the bottom surface and all side walls of the pole group, and after the pole group is coated, no splice joint is arranged on the insulating film, so that the tightness of the insulating film for coating the pole group is greatly improved, and the insulation between the pole group and the battery case can be effectively ensured.

Inventors

  • Wei Hengqian

Assignees

  • 蜂巢能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20250425

Claims (10)

  1. 1. An insulating film, comprising: A first coating portion (11), wherein the first coating portion (11) is used for coating the bottom surface (21) of the pole group; And a second coating part (12), wherein the second coating part (12) surrounds and is fixed on the periphery of the first coating part (11), the second coating part (12) is used for coating all side walls (22) of the pole group, and the second coating part (12) has plasticity and thermoplasticity.
  2. 2. The insulating film according to claim 1, characterized in that the first coating portion (11) is provided with a liquid-permeable structure (13), and that an electrolyte can be immersed between the first coating portion (11) and the bottom surface (21) of the pole group by means of the liquid-permeable structure (13).
  3. 3. An insulating film according to claim 2, characterized in that the plasticity of the first coating portion (11) is smaller than the plasticity of the second coating portion (12).
  4. 4. An insulating film according to claim 3, wherein the first coating portion (11) is PP material.
  5. 5. The insulating film according to any one of claims 1 to 4, wherein the second coating portion (12) is PVC.
  6. 6. Pole group structure, characterized in that it comprises a pole group and an insulating film according to any of claims 1-5, the bottom surface (21) of the pole group being covered by the first covering portion (11), all the side walls (22) of the pole group being covered by the second covering portion (12).
  7. 7. Pole group structure according to claim 6, characterized in that the thickness of the first cladding (11) is greater than the thickness of the second cladding (12).
  8. 8. Pole group structure according to claim 6, characterized in that the thickness of the first cladding (11) is 0.75-1.1 mm and the thickness of the second cladding (12) is 0.3-0.65 mm.
  9. 9. A battery cell comprising a battery housing and the pole group structure of any one of claims 6-8, the pole group structure disposed within the battery housing.
  10. 10. The battery cell according to claim 9, characterized in that the side of the second cladding (12) facing away from the first cladding (11) is higher than the top surface of the pole group and lower than the top of the battery case.

Description

Insulating film, electrode group structure and battery monomer Technical Field The utility model relates to the technical field of batteries, in particular to an insulating film, a pole group structure and a battery monomer. Background The battery unit comprises a battery shell, a pole group and the like, wherein the pole group is arranged in the battery shell, in order to realize insulation between the pole group and the battery shell, the outer surface of the pole group is generally subjected to insulation treatment, and the current common treatment methods comprise two steps of attaching an insulation adhesive tape to the outer surface of the pole group or attaching an insulation sheet to the outer surface of the pole group. But the mode of attaching the insulating tape on the outer surface of the pole group needs to splice two adjacent insulating tapes, the mode of attaching the insulating sheets also needs to splice two adjacent insulating sheets, and then splice seams easily occur at the splicing positions, so that the pole group positioned in the splicing seam area is exposed outside, and reliable guarantee cannot be provided for the insulativity between the pole group and the battery case. Therefore, it is needed to provide an insulating film, a pole group structure and a battery cell to solve the above technical problems. Disclosure of utility model A first object of the present utility model is to provide an insulating film that can be coated as a whole on the bottom surface and all the side walls of a pole group, and that has no splice seam after the pole group is coated. To achieve the purpose, the utility model adopts the following technical scheme: an insulating film comprising: The first coating part is used for coating the bottom surface of the pole group; And the second coating part surrounds and is fixed on the periphery of the first coating part, the second coating part is used for coating all the side walls of the pole group, and the second coating part has plasticity and thermoplasticity. Optionally, a liquid permeable structure is arranged on the first coating part, and the electrolyte can be immersed between the first coating part and the bottom surface of the pole group through the liquid permeable structure. Optionally, the plasticity of the first coating portion is less than the plasticity of the second coating portion. Optionally, the first wrapping portion is made of PP. Optionally, the second coating portion is made of PVC. A second object of the present utility model is to provide a pole group structure capable of greatly improving tightness of coating an insulating film on a pole group. To achieve the purpose, the utility model adopts the following technical scheme: The pole group structure comprises a pole group and the insulating film, wherein the bottom surface of the pole group is coated by the first coating part, and all side walls of the pole group are coated by the second coating part. Optionally, the thickness of the first cladding is greater than the thickness of the second cladding. Optionally, the thickness of the first cladding is 0.75mm-1.1mm and the thickness of the second cladding is 0.3mm-0.65mm. A third object of the present utility model is to provide a battery cell that can improve sealability between a pole group and a battery case. To achieve the purpose, the utility model adopts the following technical scheme: The battery monomer comprises a battery shell and the pole group structure, wherein the pole group structure is arranged in the battery shell. Optionally, a side of the second cladding facing away from the first cladding is higher than the top surface of the pole group and lower than the top of the battery case. The utility model has the beneficial effects that: The insulation film comprises a first coating part and a second coating part, wherein the second coating part surrounds and is fixed on the periphery of the first coating part, the second coating part has plasticity and thermoplasticity, the insulation film is paved on a plane in actual production, the bottom of a pole group is placed on the first coating part, then the second coating part is pulled to enable the second coating part to stretch and deform until the second coating part covers all side walls of the pole group, and then the second coating part is subjected to heat treatment to enable the second coating part to be thermally contracted and tightly attached to all side walls of the pole group. Therefore, the insulating film can be integrally coated on the bottom surface and all side walls of the pole group, and after the pole group is coated, no splice joint is formed on the insulating film, so that the tightness of the insulating film for coating the pole group is greatly improved, and powerful guarantee can be provided for the insulativity between the pole group and the battery case. In addition, after the second coating part is thermally shrunk and tightly attached to the side w