Heat-conducting silica gel sheet for heat dissipation of lithium battery of new energy automobile and preparation method thereof

Abstract

The invention provides a heat-conducting silica gel sheet for heat dissipation of a lithium battery of a new energy automobile and a preparation method thereof, belonging to the field of heat dissipation materials for lithium batteries. The heat-conducting silica gel sheet is prepared from the following raw materials in parts by weight: 30 to 40 parts of vinyl-terminated methyl silicone oil, 1 to3 parts of alpha,omega-hydroxyl-terminated polydimethylsiloxane, 2 to 5 parts of polymethylhydrosiloxane, 0.1 to 1 part of tetramethoxysilane, 20 to 30 parts of graphene doped boron nitride, 10 to 20parts of fumed silica, 1 to 5 parts of microcrystalline wax, 0.05 to 0.2 part of dibutyltin dilaurate, 5 to 10 parts of KH-570, 20 to 25 parts of methyl vinyl MQ silicon resin, 0.1 to 0.5 part of acetenyl cyclohexanol, 5 to 10 parts of allyl glycidyl ether, 1 to 2 parts of zinc dimethyldithiocarbamate, 0.01 to 0.02 part of a hydrosilylation catalyst and 100 to 200 parts of water. The heat-conducting silica gel sheet has good heat conduction performance, the heat conduction coefficient is larger than or equal to 7.21 W / (m.k), the insulation performance is excellent, the breakdown voltage is larger than or equal to 24.63 kV, and certain mechanical elasticity is achieved; and the heat conduction silica gel sheet is not prone to crushing and fracturing, and can meet the requirement for heat dissipation of the lithium battery of the new energy automobile.

Description

technical field [0001] The invention relates to the field of heat dissipation materials for lithium batteries, in particular to a thermally conductive silica gel sheet for heat dissipation of lithium batteries of new energy vehicles and a preparation method thereof. Background technique [0002] New energy vehicles refer to the use of unconventional vehicle fuels as power sources (or the use of conventional vehicle fuels, the use of new vehicle power devices), integrated vehicle power control and advanced technology in driving, the formation of advanced technical principles, with Automobiles with new technology and new structure. New energy vehicles include pure electric vehicles, extended-range electric vehicles, hybrid vehicles, fuel cell electric vehicles, hydrogen engine vehicles, and other new energy vehicles. Among them, a pure electric vehicle is a vehicle that uses a single battery as the energy storage power source. It uses the battery as the energy storage power s...

AI Technical Summary

Problems solved by technology

[0003] Lithium-ion batteries, as the power core of new energy vehicles, form car battery packs through parallel connection and series connection. Due to the dense assembly method between batteries, it is easy to form a high temperature environment, which has a certain impact on battery performance and state of charge. , in severe cases, it will lead to the failure of the power system control of new energy vehicles

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