Insulation powder coating, and preparation method and painting method thereof, and lithium battery metal shell coated with insulation powder coating

Abstract

The invention provides insulation powder coating. The insulation powder coating is in powdered shape. The insulation powder coating is prepared from the following components in parts by weight: 100 parts of solid epoxy resin, 10 to 100 parts of solid organic silicon resin, 1 to 60 parts of latent curing agent, 10 to 100 parts of flame retardant, and 0.1 to 10 parts of accelerant, wherein the epoxy resin comprises bisphenol A epoxy resin, and the latent curing agent comprises multi-amino cage-shaped silsesquioxane. An insulation layer formed by the insulation powder coating is used for substituting the traditional adhesive film, a compact complete protection layer is formed on the overall outer surface of a shell, a pin hole is avoided, the adhesion is good, the insulation powder coating has good insulation performance, electricity leak-proof performance, flame retardance and mechanical performance, and also has good heat conductivity, heat generated by the running of a lithium battery can be released in time. Permanent insulation protection can be provided for the exterior of a metal shell, so that the reliability of the battery is improved. The invention also provides a preparation method and a painting method of the insulation powder coating, and a lithium battery metal shell coated with the insulation 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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