In new energy vehicles, liquid silicone encapsulant is mainly used in the lithium battery pack link, which plays the role of heat dissipation, flame retardant, insulation, waterproof, etc., which greatly improves the power safety of new energy vehicles. Lithium batteries are sensitive to moisture, and the tightness directly affects the working safety of the battery system and the safety of electric vehicles. From the perspective of development history, silicone has undergone product upgrades from single-component cushion-free glue - foam molding sealing ring - online foam silicone in sealing and waterproofing. However, the liquid silicone potting compound has a large proportion, which will increase the weight of the battery pack, reduce the energy ratio per unit volume, and ultimately affect the energy density. How to realize the lightweight of liquid silicone is an urgent problem to be solved by silicone enterprises at present. At present, online foamed silica gel is favored in the new energy vehicle industry, and is suitable for application scenarios such as sealing and waterproofing of power batteries, shock absorption protection of soft-packed cells, thermal insulation of battery packs, and lightweight.