Insulating powder coating and its preparation method, application method, lithium battery metal case coated with the insulating powder coating

Abstract

The invention provides an insulating powder coating. The insulating powder coating is in the form of powder and comprises 100 parts by weight of solid epoxy resin, 10-100 parts of solid silicone resin, 1-60 parts of latent curing agent, 10-100 parts of flame retardant and 0.1-10 parts of accelerator, wherein, the epoxy resin includes bisphenol A type epoxy resin, and the latent curing agent includes polyamino cage silsesquioxane. The insulating layer formed by the insulating powder coating of the present invention is used to replace the traditional adhesive film, forming a dense and complete protective layer on the entire outer surface of the shell, without pinholes, good adhesion, excellent insulation, anti-leakage, flame retardant It has excellent performance and mechanical properties, and has good thermal conductivity, which can release the heat generated by the lithium battery in time. It can provide permanent insulation protection for the exterior of the metal case and improve the reliability of the battery. The invention also provides a preparation method and a coating method of the insulating powder coating, and a lithium battery metal case coated with the insulating powder coating.

Description

technical field [0001] The invention relates to the field of insulating materials, in particular to an insulating powder coating, a preparation method and an application method thereof, and a lithium battery metal case coated with the insulating powder coating. Background technique [0002] With the development of the new energy industry, lithium-ion batteries are being used more and more widely due to their advantages of high energy density, long cycle life, good rate performance, and safety and reliability. The inner and outer surfaces of the lithium-ion battery with a metal case are easily in contact with the conductive material of the battery cell or the external environment, causing leakage or short circuit. At present, this problem is generally solved by pasting a layer of blue film (PET film) on the side of the outer surface of the shell and a layer of yellow film (PI film) on the bottom, but on the one hand, the price of blue film and yellow film is relatively high. ...

AI Technical Summary

Problems solved by technology

The inner and outer surfaces of the lithium-ion battery with a metal case are easily in contact with the conductive material of the battery cell or the external environment, causing leakage or short circuit

At present, this problem is generally solved by pasting a layer of blue film (PET film) on the side of the outer surface of the shell and a layer of yellow film (PI film) on the bottom, but on the one hand, the price of blue film and yellow film is relatively low. Expensive and high cost. On the other hand, the film coating process is cumbersome, and the quality cannot be improved. Bubbles and gaps are easy to be left during the pasting process, especially at the junction of the side and the bottom. On the other hand, due to the material of the film Softer and thinner, it is not an adhesive film that is bonded to the shell as a whole. The bonding strength between the film and the shell is limited, and it is easy to be scratched and damaged; because the current insulating film is a PET film, the flame retardancy is difficult Reach the V0 level; moreover, the inner surface of the existing metal shell lithium-ion battery shell is not insulated, and there is a risk of battery self-discharge. Safety performance is affected

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