Silicon foam is a kind of porous, low density, compressible elastomer, by the silicon like rubber raw rubber, filler, vulcanization accelerator, foam rubber and other raw materials, mixing and refining uniformly, and then by a special process in the high pressure and high temperature made. It has a better shockproof buffer, sound insulation, heat insulation and heat preservation, as well as flame retardant and explosion-proof properties. In the automotive field, silicon foam is mainly used in automotive air conditioning with thermal insulation foam tubing, automotive shock absorption, new energy vehicle batteries with foam silicone sealing gaskets and so on.
New energy car battery, silicon foam is mainly used to provide excellent heat insulation, cushioning, flame retardant, sealing, support, as well as shock absorption and other functions. Between the battery cells, in the process of thermal expansion and contraction of the cells, the silicone foam can effectively prevent damage to the battery and improve the service life of the battery.
In addition, silicone foam has good flame retardant properties, flame retardant grade can reach UL94-V0, applied to electric vehicles, can be very good to reduce the problems caused by combustion. This is because the silicone foam can effectively prevent the battery in the overcharge, pinprick, collision and other cases of thermal runaway, to avoid the battery short-circuit generated by the electric sparks and arcs, thus preventing the battery explosion and vehicle spontaneous combustion.
In the field of new energy vehicles, silicon foam has the following advantages:
1. Anti-vibration buffer: silicon foam in the automotive field is mainly used in automotive vehicle air conditioning with insulation foam tubing, automotive shock absorption, new energy vehicle batteries with foaming silicone sealing gaskets and so on. It can effectively prevent the battery from breaking due to vibration and shock during transportation and use.
2. Thermal insulation: Silicon foam has good thermal insulation properties, can effectively prevent heat conduction to the battery shell, but also can prevent the internal heat of the battery over the dissipation, thus ensuring the normal operating temperature of the battery, improve battery life and performance.
3. Flame retardant and explosion-proof: silicon foam has excellent flame retardant properties, flame retardant grade can reach UL94-V03, which is particularly important for new energy vehicle batteries, because the battery in the working process may generate a lot of heat, if not effectively control and stop, may lead to thermal runaway batteries, or even an explosion 4.
4. Sealing performance: Silicon foam has excellent sealing performance, which can ensure the sealing structure of the battery, prevent the penetration of moisture and gas, and improve the moisture resistance and corrosion resistance of the battery34.
5. Weathering performance: silicon foam has excellent weathering performance, can work stably in a variety of environmental conditions, including high temperature, low temperature, humidity, corrosion and other environments.
In general, the main advantages of silicon foam in new energy vehicle battery sealing flame retardant applications are: can effectively prevent battery damage caused by thermal expansion and contraction of the battery, improve the service life of the battery; has good flame retardant properties, can effectively prevent the battery in the case of overcharging, pinprick, collision and so on thermal runaway, to prevent the battery from exploding and spontaneous combustion of the vehicle. Therefore, silicon foam has a broad application prospect in the new energy vehicle battery sealing flame retardant applications.
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