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Coating slurry based on linear aromatic polymer compound, preparation method and application thereof, and battery shell

A polymer compound and battery casing technology, applied in polyamide coatings, battery pack components, battery boxes/coatings, etc., can solve the problems of lack of protective layer and difficult assembly of battery casings, increase the difficulty of assembly, avoid Potential safety hazards, the effect of high withstand voltage breakdown performance

Inactive Publication Date: 2020-05-08
HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coating slurry based on a linear aromatic polymer compound, which can be used to coat metal The inner wall of the battery case, so that it has the characteristics of insulation, flame retardancy, buffering, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A coating slurry for a battery casing, comprising a polar solvent (NMP), PMIA and a binder homopolymerized PVDF with a mass ratio of 92:4.5:3.5. Prepared by:

[0045] Step 1, dry mixing PMIA and binder homopolymerized PVDF at normal temperature;

[0046] Step 2: Add a polar solvent, and mix evenly at a temperature of 85° C. at a stirring revolution speed of 40 rpm and a shear dispersion rotation speed of 1000 rpm.

[0047] A battery casing, comprising the steps of:

[0048] The coating slurry is coated on the inner wall of the battery case by dipping or spraying, and then dried at 85°C. The thickness of the coating after drying is 4 μm.

Embodiment 2

[0050]A coating slurry for a battery case, comprising a polar solvent (DMAC), PMIA, binder homopolymerized PVDF and cosolvent LiCl with a mass ratio of 90:4.5:3.5:2, prepared by the following method:

[0051] Step 1, dry mixing PMIA and binder homopolymerized PVDF at normal temperature;

[0052] Step 2: Add polar solvent and co-solvent, and mix uniformly at 65° C. with a stirring revolution speed of 40 rpm and a shear dispersion rotation speed of 1000 rpm.

[0053] Coating the battery casing with the coating slurry comprises the following steps:

[0054] The coating slurry is coated on the inner wall of the battery case by dipping or spraying, and then dried at 85°C. The thickness of the coating after drying is 4 μm.

Embodiment 3

[0056] A coating slurry for a battery casing, comprising a polar solvent (DMAC), PMIA, binder homopolymerized PVDF, cosolvent LiCl and non-solvent DEC with a mass ratio of 88:4:3.5:2:2.5, through Prepared as follows:

[0057] Step 1, dry mixing PMIA and binder homopolymerized PVDF at normal temperature;

[0058] Step 2, add a polar solvent and a co-solvent, and mix evenly at a temperature of 65°C with a stirring revolution speed of 40rpm and a shear dispersion rotation speed of 1000rpm;

[0059] Step 3, adding the non-solvent DEC and stirring at room temperature.

[0060] Coating the battery casing with the coating slurry comprises the following steps:

[0061] The coating slurry is coated on the inner wall of the battery casing by dipping or spraying, and then dried at 120°C. The coating thickness after drying is 3 μm.

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PUM

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Abstract

The invention discloses a coating slurry based on a linear aromatic polymer compound, a preparation method and an application thereof, and a battery shell. The coating slurry comprises a polar solvent, the linear aromatic polymer compound and a binder in a mass ratio of (88-98):(1-10):(1-6), the linear aromatic polymer compound is PEEK, PES, PPTA, PMIA or PI, and the battery shell comprises a shell and a coating formed by coating the inner wall of the shell with the coating slurry. The coating has good acid and alkali resistance and strong electric field resistance, is not corroded and degraded in an electrolyte system, well prevents the electrolyte from being in contact with any one of metal shells, and plays a role in protecting the shell and a pole group.

Description

technical field [0001] The invention relates to the field of battery technology, in particular to a coating slurry based on a linear aromatic polymer compound, a preparation method and application thereof, and a battery casing. Background technique [0002] For batteries such as square aluminum shells and steel shells, the current common technologies include multi-step stretching of aluminum ingots, direct casting, and plate welding and assembly. The metal on the inner wall of the casing will be directly immersed in the electrolyte, and the electrode collectors of some structures of the battery will also be in direct contact with the battery casing. There are many risks in the direct mechanical contact between the metal casing and the electrodes. [0003] For example: 1) The metal casing squeezes, rubs, and collides with the electrode, causing mechanical damage to the electrode coating, current collector, etc., resulting in battery failure, etc.; 2) The metal casing contacts...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D177/10C09D127/16C09D139/06C09D127/18C09D133/12C09D5/25C09D7/20C09D7/63H01M2/02
CPCC08L2203/206C09D5/00C09D127/18C09D133/12C09D177/10C09D7/20C09D7/63H01M50/116H01M50/124C08L27/16C08L39/06C08K5/42C08L33/12Y02E60/10
Inventor 袁海朝徐锋苏碧海
Owner HEBEI GELLEC NEW ENERGY MATERIAL SCI&TECHNOLOY CO LTD
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