At present, electric vehicles mainly use lithium-ion batteries as power batteries. After years of development, the safety of lithium-ion power batteries has been significantly improved. However, under extreme conditions, lithium batteries still have the risk of combustion and explosion, and fire or explosion of lithium batteries has become the main technical cause of accidents in new energy vehicles. There are two ways to reduce or eliminate such accidents. One is to change the lithium-ion battery itself, and the other is to use new materials with fire-retardant properties. At present, the domestic mainstream has lead acid, lithium titanate, lithium cobalt acid, lithium iron phosphate, nickel cobalt manganese, nickel cobalt aluminum five kinds of power battery. Lithium iron phosphate and ternary lithium batteries are also the most widely used mainstream power sources for electric vehicles. Nor will it be easy to find new materials to change or even replace the lithium-ion battery itself.

Therefore, it is urgent to find new materials with more fire retardant function for lithium battery sealing protection equipment. At present, the commonly used power battery thermal insulation materials are foam, plastic foam, ultrafine glass wool, high silicon oxygen cotton, vacuum heat insulation board, etc., but in the promotion of new energy vehicles, there are advantages and disadvantages.

The core energy source of new energy vehicles is the battery pack, which provides driving power for the vehicle. To protect the components of the battery pack from dust and rain, the shell sealing equipment of the battery pack must meet the following six functions: flame retardant, high temperature resistance, low thermal conductivity, no toxic gas, waterproof, moisture-proof, shockproof, light weight, thin thickness, and affordable. Therefore, the waterproof and sealing design of the battery pack is very important. Foaming silica gel with high quality mechanical properties, excellent electrical performance and reliable performance, can effectively solve the sealing shock absorption of the upper and lower shell of the battery pack of new energy vehicles and other automotive components support shock absorption problems.

Foamed silica gel is the lightest solid material in engineering application at present. It is a kind of porous, low-density and compressible polymer elastomer material prepared by foaming vulcanization at high temperature after mixing evenly with silicone rubber, filler, vulcanizing agent and foaming agent as raw materials. Insulation environmental protection, non-toxic, no smell, good flexibility. Long-term use of deformation, compression resistance, acid and alkali resistance, anti aging, anti ultraviolet. High temperature resistance (up to -40~220℃). Therefore, it has become the thinnest and most efficient thermal insulation and waterproof sealing equipment for new energy vehicles and power batteries. Foamed silica gel is also widely used in LED around light leakage, dust, impact absorption, increase air tightness processing, as well as speakers, sound around the noise, fill the gap processing.