Preparation method for coating film capable of enhancing hardness and toughness of soft package lithium battery

Abstract

The invention belongs to the technical field of batteries, and particularly discloses a preparation method for a coating film capable of enhancing the hardness and toughness of a soft package lithium battery. The preparation method comprises the following steps that 1 coating film solution preparing, wherein solvent is stirred at high speed, then a composition of alkyd resin, epoxy resin and polyether ether ketone is added, the mixture is stirred, then an antifoaming agent and a flatting agent are added, the solvent is continuously added to regulate the system viscosity, and the mixture is stirred for 10-30 min to obtain coating film solutions; 2 coating film preparing, wherein the coating film solutions obtained in the step 1 are evenly sprayed on the surface of the soft package lithium battery through a spray gun and stood at room temperature or baked at high temperature in a vacuum state and stood until the coating film solutions are dry, and then the coating film is formed on the surface of the soft package lithium battery. The preparation method is simple and stable in technology; the prepared coating film can effectively improve the hardness and toughness of the soft package lithium battery, has the excellent corrosion resistance and is good in water resistance and capable of preventing dampness, effectively protecting the soft package lithium batter and prolonging the service life of the soft package lithium battery.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to a coating film preparation method for enhancing the hardness and toughness of soft-pack lithium batteries. Background technique [0002] Soft-pack lithium batteries are characterized by the combination of the basic electrochemical properties of liquid lithium batteries and the unique advantages of polymer lithium batteries in appearance and packaging, and use a liquid electrolyte similar to liquid lithium batteries as a means of transporting lithium ions between the positive and negative electrodes. medium. Compared with metal shell or plastic shell batteries, soft pack lithium batteries have good safety performance, thin thickness, flexible design, and lower cost, so they are favored by users at home and abroad. At the same time, the outstanding advantages of the soft pack lithium battery are its simple production process, low cost and high yield. However, the ha...

AI Technical Summary

Problems solved by technology

However, the hardness of the aluminum-plastic film outsourced to the soft-packed lithium battery is so poor that the battery is easily deformed, prone to pits, wrinkles, scratches and other poor appearance, and the aluminum-plastic film is easily damaged, especially in the field of power technology. Not enough, can't withstand long-term vibration and impact, which limits the development of soft-pack lithium batteries in this field

Chinese patent application 102653656A discloses a method for improving the hardness and toughness of pouch batteries, which uses thermoplastic phenolic resin, rosin-modified alkyd resin, urea-formaldehyde resin, polyvinyl butyral or alcohol-soluble polyacrylic resin dissolved in methanol , ethanol, ethylene glycol, propanol, isopropanol, propylene glycol, n-butanol, isobutanol, 1,4-butanediol or hexanol, and then spray on the surface of the soft pack battery to form a coating film to improve the soft pack The hardness and toughness of the battery, however, the effect of this solution to improve the hardness and toughness of the pouch battery needs to be improved

[0003] Chinese patent CN1327540C discloses a preparation method of lithium-ion battery protective film, which comprises phenolic resin, epoxy resin, polyvinyl acetate, polyurethane, polytetrafluoroethylene, chloroprene rubber, phenolic-chloroprene rubber, epoxy- At least one of polyesteramine, phenolic-polyvinyl acetal, etc. is added to at least one of deionized water, methanol, benzene, toluene, acetone, ethyl acetate, n-hexane, etc., and then sprayed to form a protective film, but the corrosion resistance of the protective film still needs to be improved, and the role of the protective film is to protect the battery surface during the production process of flexible packaging lithium batteries and avoid scratches. It will be torn off after the battery assembly is completed, which cannot improve The role of battery hardness and toughness

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