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Method for preparing lithium iron cell protective film and solvent for cleaning said protective film

A lithium-ion battery and protective film technology, which is applied to battery components, circuits, anti-corrosion coatings, etc., can solve the problem that the battery shell is easily corroded by electrolyte and sweat

Inactive Publication Date: 2007-07-18
HENAN HUANYU GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of lithium-ion batteries, a layer of protective film is coated on the shell, which solves the problem that the battery shell is easily corroded by electrolyte and sweat, which is convenient to operate and saves costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The protective film of the present invention is formed by coating or spraying the organic solution on the surface of the battery case to volatilize the solvent.

[0011] The above organic solution is prepared by adding one or several organic polymers to a specific solvent at a temperature of 10°C to 60°C, mixing and stirring, wherein the specific solvent is at least one selected from the following substances: deionized Water, methanol, ethanol, propanol, benzene, toluene, xylene, chloroform, dichloroethylene, ether, petroleum ether, acetone, methyl ethyl ketone, ethyl acetate, n-hexane, formamide; organic polymers are optional At least one of the following: phenolic resin, epoxy resin, polyvinyl acetate, polyurethane, polyvinyl formal, polytetrafluoroethylene, polyvinylidene fluoride, neoprene, butyl rubber, styrene-butadiene rubber , Phenolic - neoprene, epoxy - polysulfide rubber, epoxy - polyamide, nylon - epoxy, phenolic - polyvinyl acetal, lacquer, asphaltene.

[...

Embodiment 2

[0015] The difference between this embodiment and the first embodiment lies in that the mass percentage of the polymer in the preparation process of the protective film is 30-60%, and other compositions, processes and conditions are the same as the first embodiment. The thickness of the film is thicker than that of Example 1, and the film forming time is 40 seconds to 400 seconds.

Embodiment 3

[0017] The difference between this embodiment and the first embodiment lies in that the mass percentage of the polymer in the preparation process of the protective film is 60-90%, and other compositions, processes and conditions are the same as the first embodiment. The film-forming thickness is thicker than that of Examples 1 and 2, and the film-forming time is 60 seconds to 600 seconds.

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PUM

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Abstract

A prepn. method for protective film of lithium ion cell. At least one organic polymer among phenolic resin, epoxy resin, polyvinyl acetate, polyurethane, polytetrafluoroethylene, chloronorgutta, phenolic chloronorgutta, epoxy polyamide and phenolic polyvinyl acetal is added into particular solvent selected at least one from diionized water, carbinol, benzene, toluene, chloroform dichloroethylene, diethyl ether, acetone, ethyl acetate and normal ethane, they are mixed and stirred to organic solution which is coated on case of lithium ion cell, then the case is static placed to volatilize particular solvent in the organic solution in room temp. to form a layer of uniform and densify protective film on cell case. Said film can prevent corrding of electrolyte and perspiration in prodn process. The invent is also relates to a solvent used for cleaning said proctive film selected from deionized water, alcohol, acetone, oxolane and formyldimethylamine.

Description

technical field [0001] The invention relates to a preparation method of a protective film of a lithium ion battery and a solvent for cleaning the protective film. Background technique [0002] The electronic information age has rapidly increased the demand for mobile power. Due to the important advantages of high voltage and high capacity, long cycle life and good safety performance, lithium-ion batteries have broad application prospects in portable electronic equipment, electric vehicles, space technology, defense industry, etc. A research hotspot that has been widely concerned in the past year. However, during the production process of this kind of battery, due to various reasons, the outer surface of the casing is easily corroded when it contacts electrolyte or sweat, or is easily scratched by sharp objects, thereby affecting the aesthetics of the battery and giving customers a bad impression. For this reason, some manufacturers prevent the battery case from being corro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/02C09D5/00C09D5/08H01M50/121
CPCY02E60/10
Inventor 王伟刚李荣富
Owner HENAN HUANYU GROUP
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