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CN-122000477-A - Battery, preparation method thereof and electricity utilization device

CN122000477ACN 122000477 ACN122000477 ACN 122000477ACN-122000477-A

Abstract

A battery, a preparation method thereof and an electric device can provide a battery box body with super-hydrophobic anti-icing function, which is convenient for the operation of battery replacement in a low-temperature environment, and improves the operation simplicity and replacement efficiency of the electric device for battery replacement. The battery comprises a battery monomer, a box body and a water rolling angle alpha, wherein the box body is used for accommodating the battery monomer, the box body comprises a plurality of walls, the walls are enclosed to form the box body, at least one wall of the walls comprises a base material and a coating arranged on at least one side surface of the base material, the water contact angle theta of the coating is more than or equal to 150 degrees, and the water rolling angle alpha of the coating is less than or equal to 10 degrees.

Inventors

  • WANG JIAN
  • TAO LEI
  • LIU YUXUAN
  • ZHANG YUXI

Assignees

  • 宁德时代新能源科技股份有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (19)

  1. 1. A battery, comprising: A battery cell; The box body is used for accommodating the battery monomers; The box body comprises a plurality of walls, the walls are enclosed to form the box body, at least one wall of the walls comprises a base material and a coating arranged on at least one side surface of the base material, the water contact angle theta of the coating is more than or equal to 150 degrees, and the water rolling angle alpha of the coating is less than or equal to 10 degrees.
  2. 2. The cell of claim 1, wherein the coating has an impact strength K of 100kJ/m 2 ≤K≤200kJ/m 2 .
  3. 3. The battery according to claim 1 or 2, wherein the coating comprises a polyamide and hydrophobic silica, the polyamide having a volume average particle diameter Dv50 1 satisfying 30 μm≤Dv50 1 ≤100 μm and the hydrophobic silica having a volume average particle diameter Dv50 2 satisfying 100 nm≤Dv50 2 ≤200 nm.
  4. 4. The cell of claim 3, wherein the hydrophobic silica is present in an amount P 1 of 8% to P 1 % by weight to 24% by weight based on the total weight of the coating.
  5. 5. The battery of claim 3 or 4, wherein the polyamide comprises at least one of polycaprolactam, polydodectam, polyhexamethylene adipamide.
  6. 6. The battery of any one of claims 3 to 5, wherein the hydrophobic silica comprises fluorine modified silica.
  7. 7. The cell of claim 6, wherein the fluorine element content by weight P 2 is 0.8% to 8% P 2 % based on the total weight of the fluorine modified silica.
  8. 8. The battery of any one of claims 1 to 7, wherein the coating further comprises a binder comprising polytetrafluoroethylene resin and polyurethane.
  9. 9. The battery of claim 8, wherein the polytetrafluoroethylene resin comprises acrylate modified polytetrafluoroethylene.
  10. 10. The battery of any one of claims 1 to 9, wherein the coating further comprises an interface modifier comprising an amino-containing silane coupling agent.
  11. 11. The battery of claim 10, wherein the amino-containing silane coupling agent comprises at least one of aminopropyl triethoxysilane, aminobutyl triethoxysilane, aminopropyl trimethoxysilane, aminobutyl trimethoxysilane.
  12. 12. The battery of any one of claims 1 to 11, wherein the coating further comprises a thickener comprising at least one of polypropylene, polyethylene, polyvinyl chloride.
  13. 13. The battery according to any one of claims 1 to 12, wherein the thickness L of the coating layer satisfies 60 μm≤l≤100 μm.
  14. 14. The battery of any one of claims 1 to 13, wherein the substrate comprises an aluminum alloy.
  15. 15. The battery of any one of claims 1 to 14, wherein the battery is disposed above a chassis of an electrical device, the housing comprises a bottom wall disposed opposite the chassis, the bottom wall comprises the substrate and the coating disposed on a surface of the substrate on a side adjacent the chassis.
  16. 16. A method of manufacturing a battery, comprising: Providing a box body for preparing the battery, wherein the box body is used for accommodating battery monomers; wherein, the providing box includes: providing a plurality of walls, wherein at least one wall of the plurality of walls comprises a substrate and a coating layer arranged on at least one side surface of the substrate, the water contact angle theta of the coating layer is more than or equal to 150 DEG, and the water rolling angle alpha of the coating layer is more than or equal to 10 DEG The plurality of walls are enclosed to form the box.
  17. 17. The method of preparing according to claim 16, wherein said providing a plurality of walls comprises: Mixing a polyamide and hydrophobic silica to obtain a slurry of the coating, wherein the volume average particle diameter Dv50 1 of the polyamide satisfies 30 μm≤Dv50 1 ≤100 μm, and the volume average particle diameter Dv50 2 of the hydrophobic silica satisfies 100 nm≤Dv50 2 ≤200 nm; The slurry of the coating is coated on the surface of at least one side of the substrate to form the wall.
  18. 18. An electrical device comprising a battery according to any one of claims 1-15 and/or a battery obtained by the method of manufacture according to claim 16 or 17.
  19. 19. The electrical device of claim 18, wherein the electrical device comprises a heavy duty truck.

Description

Battery, preparation method thereof and electricity utilization device Technical Field The application relates to the technical field of batteries, in particular to a battery, a preparation method thereof and an electric device. Background With the increasing increase of environmental pollution, the new energy industry is receiving more and more attention. In the new energy industry, battery technology is an important factor in its development. The existing battery installation modes of the power utilization device are generally divided into fixed type and replaceable type, and the replaceable battery is widely applied due to the advantages of being capable of being replaced at any time, high in flexibility and the like, and the difficulty and the replacement efficiency of replacement operation of the replaceable battery in the replacement process are important points of people. Disclosure of Invention The present application has been made in view of the above problems, and an object of the present application is to provide a battery case having superhydrophobic anti-icing properties, which facilitates battery replacement operation of an electric device in a low-temperature environment, and improves battery replacement operation easiness and replacement efficiency of the electric device. In order to achieve the above purpose, the application provides a battery, a preparation method thereof and an electric device. In a first aspect, a battery is provided, which comprises a battery monomer, a box body and a plurality of walls, wherein the box body is used for accommodating the battery monomer, the box body is composed of the plurality of walls, the plurality of walls are surrounded to form the box body, at least one wall of the plurality of walls comprises a base material and a coating layer arranged on at least one side surface of the base material, the water contact angle theta of the coating layer is more than or equal to 150 degrees, and the water rolling angle alpha of the coating layer is less than or equal to 10 degrees. In the embodiment of the application, the water contact angle theta of the coating on the wall of the battery box body meets the condition that theta is more than or equal to 150 degrees, and the water rolling angle alpha of the coating meets the condition that alpha is less than or equal to 10 degrees, and the water contact angle and the water rolling angle of the coating are respectively in the ranges, so that the coating has particularly good hydrophobicity, the possibility that liquid water adheres to the wall of the battery box body can be reduced, and the risk of icing of the surface of the coating due to the adhesion of the liquid water at low temperature is reduced. Therefore, when the battery is arranged in the electric device, the battery and the chassis of the electric device are not connected together due to the icing of the wall of the battery box body, and when the battery is replaced by the electric device, the battery is not required to be replaced after the battery and the chassis of the electric device are separated by removing ice between the battery and the chassis of the electric device, so that the battery is convenient to replace in a low-temperature environment, and the operation simplicity and the replacement efficiency of the battery replacement by the electric device are improved. In one possible implementation, the impact strength K of the coating satisfies 100kJ/m 2≤K≤200kJ/m2. In the embodiment of the application, the impact strength of the coating on the wall of the battery box body is in the range, the coating has good impact resistance, the risk of damaging the coating under the impact of external force is reduced, and the risk of corrosion of the exposed substrate on the wall of the box body is reduced. In one possible implementation, the coating comprises a polyamide having a volume average particle diameter Dv50 1 of 30 μm≤Dv50 1≤100 μm and a hydrophobic silica having a volume average particle diameter Dv50 2 of 100 nm≤Dv50 2≤200 nm. In the embodiment of the application, the coating of the wall of the battery box body adopts polyamide with a specific particle size range, so that the roughness of the surface of the coating can be improved, the coating has good mechanical property, the impact resistance of the coating is improved, and the risk of damaging the coating under the impact of external force is reduced. The wall coating also adopts hydrophobic silica with a specific particle size range, so that the hydrophobicity of the coating is improved, and the risk of icing of the coating at low temperature is reduced. According to the technical scheme, the polyamide with the specific particle size range and the hydrophobic silica with the specific particle size range are matched to construct the micro-nano structure of the coating of the wall of the box body, so that the coating has good mechanical property and hydrophobic property, the anti-icing prope