Silicone has the advantages of high and low temperature resistance, electrical insulation, corrosion resistance, oxidation resistance, and physiological inertness. According to these characteristics, the different types of power battery markets and the needs of customers, silicone companies have developed products in various forms. At present, the most common product types on the market are: thermally conductive potting glue/filler, foamed silica gel, thermally conductive gasket, thermally conductive silicone grease and thermally conductive mud, etc.

In the accident of new energy vehicles, lithium battery fire or explosion is the main reason. There are two ways to reduce and eliminate such accidents. One is to change the lithium battery itself, and the other is to use silicone as a potting material to play a fire-retardant and flame-retardant role.

The role of silicone in new energy vehicle batteries mainly includes the following three points:

1. Heat conduction and heat dissipation, balance temperature. The normal working temperature of lithium battery is -20℃-60℃, and the temperature is too high or too low, it is easy to cause problems. After using organic silica gel, according to the different PACK process, the organic silica gel is perfused and arranged in the gaps around the battery pack to add a barrier to the battery pack. Even in an overheated or too cold environment, the battery pack can still work stably.

2. Flame retardant and explosion-proof. When a single cell in the battery pack has an extreme failure and explosion, the silicone potting compound can isolate oxygen to play a protective role, protect other cells in the battery pack from being affected, and prevent the entire battery pack from exploding and burning. At present, China Tianqi Technology (cs-9813) and Huitian have this product.

3. Insulation and waterproof. The physiological inertness of silicone ensures its compatibility with other materials during the PACK process, and the insulating properties can protect the key electronic components, cells and busbars inside the battery, thereby avoiding short-circuiting of the battery, preventing the risk of power surge and battery fire. In addition, silicone is hydrophobic. Using this feature, companies have also developed waterproof products. In response to harsh environments such as typhoons and rainstorms, silicone can put on a "waterproof suit" for the battery.