The raw material of silicone foam (also known as: silicone foam/polyurethane foam) is made of raw silicone rubber, fillers, vulcanization accelerators, foam rubber, etc. It is a kind of porous structure, low density and compressible polymer material polyurethane elastomer raw material for the production of polyurethane foamed vulcanized rubber. Today, organic chemical silicone foams are increasingly used because of their additional properties of silicone and foam materials. It not only has the high elasticity of vulcanized rubber, but also has the performance of foam plastic raw materials such as sound insulation and shock absorption. .

The key to the application of silicone foam in the power lithium battery of new energy vehicles are: thermal insulation of the battery cell cache, and sealing of the outer frame. The battery cell is the source of kinetic energy for pure electric vehicles, and the safety hazard of the battery cell immediately endangers the safety of the whole vehicle. When the cell is working, it will cause a certain amount of heat, and it can produce a certain thermal expansion and cold contraction effect at different temperatures. It may cause damage to the battery cell and make the rechargeable battery ineffective or even uncontrollable. Silicone foam has high reduction and reduction characteristics, and avoids the deformation caused by the thermal expansion and contraction of the rechargeable battery cell during the whole process of battery charging, charging and discharging. Offers excellent durability and its excellent shrink and repair characteristics, impact digestion and absorption, and flame retardancy (UL 94 V0 rating).

Because the output voltage of the battery pack is above 200V, it is stipulated that the rechargeable battery case must be sealed and waterproof to avoid circuit short circuit caused by water seepage, and the waterproof level of the rechargeable battery case must be IP67. Silicone foam has:
1. Under different temperatures, the product performance of the sealing ring is stable;
2. It has excellent waterproof and sealing performance, no water seepage after the product goes out;
3. The long-term shrinkage damage is small, and it has a certain working ability to curb shrinkage deformation;
4. It has excellent flame retardant properties to solve the heat generation caused by the running state and the uncontrollable heat that is likely to be generated;
5. With different thickness and strength to consider the requirements of different standards, the sealing ring must be well matched with the cover and have a low closing force to prevent the sealing ring from bending and arching.