Silicone foam material (also known as: silicone foam/foamed silicone) is made of silicone rubber raw rubber, fillers, vulcanization accelerators, foam rubber, etc. as raw materials. A porous, low-density, compressible polymer elastomer made at high temperature. Because of the high elasticity of silicone rubber and the sound insulation and shock absorption properties of foam materials, it is widely used in life and is mostly used as vibration damping pads, sealing gaskets, sound-absorbing materials, insulating layer materials, and airline insulation materials. According to the cell structure, silicone foam is divided into three types: closed cell type, open cell type and mixed type.

The closed-cell foamed silicone foam material has the characteristics of good shockproof buffer, sound insulation, heat insulation, flame retardant and explosion-proof. Foamed silicone gaskets for automobile batteries, etc. Many interior materials of today's automobiles, such as floors, ceilings, steering wheels, and car seats, are all polyurethane foam materials. Because the price of polyurethane foam material is lower. However, polyurethane foams have poor weather resistance, are flammable, and release a large amount of toxic gases that are harmful to humans during combustion. Therefore, with the promotion of silicone foam materials and the improvement of people's understanding of them, silicone foam materials are expected to replace traditional polyurethane foam materials in the future.

The application of silicone foam in the electric vehicle industry:

The battery cell is the source of kinetic energy for pure electric vehicles. The safety hazard of the battery cell seriously endangers the safety of the whole vehicle. When the battery cell is working, it will generate a certain amount of heat, and it can produce a certain thermal expansion and contraction effect at different temperatures. , causing the cells to expand to a certain extent, and the long-term capacitance grid friction between the cells is likely to cause damage to the cells and cause the rechargeable battery to be invalid, and even uncontrollable in severe cases. In addition, when 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. The waterproof level of the rechargeable battery case is required to be IP67.

Silicone foam has high reduction and reduction characteristics, avoids deformation caused by thermal expansion and contraction of rechargeable battery cells during the whole process of battery charging, charging and discharging, and has excellent durability, low shrinkage, and impact digestion and absorption. and flame retardancy (UL 94 V0 rating). At the same time, silica gel also has good waterproof performance, as well as the following properties, so it is widely used in the cache thermal insulation and outer frame sealing of new energy cells.

1. At different temperatures, the performance of silicone foam is stable, and the performance of the product sealing ring is stable. 2. Excellent waterproof sealing performance, no water seepage when the product is used outside. 4. Excellent flame retardant performance, which can effectively prevent the risks caused by thermal effects during battery operation. 5. Thickness and strength can be designed according to different standards. The sealing ring must be well matched with the casing and has low internal stress, which can effectively avoid the bending of the sealing ring. Application of arched silicone foam gasket in the sealing of the outer frame of new energy power lithium battery.