Low specific gravity flame retardant heat conduction potting compound for automobile power battery and preparation method thereof

Abstract

The invention discloses a low-specific-gravity flame-retardant heat-conducting pouring sealant for an automobile power battery and a preparation method thereof. The low-specific-gravity flame-retardant heat-conducting pouring sealant is prepared from a component A and a component B, wherein the component A is prepared from a base material, a hydrogen-containing silicone oil crosslinking agent, a curing inhibitor and vinyl polydimethyl siloxane; the component B is prepared from a base material, a platinum complex catalyst and vinyl polydimethyl siloxane; the base material is prepared from vinyl polydimethyl siloxane, a composite halogen-free flame retardant and hollow glass microspheres; the composite halogen-free flame retardant is compounded from at least one nitrogen-containing flame retardant and at least one inorganic flame retardant; the weight part ratio of the nitrogen-containing flame retardant to the inorganic flame retardant is (0.3-3.5) to 1. The pouring sealant disclosed by the invention has low specific gravity, and has high flow performance during use and high operability. A cured product has excellent flame retardancy and high heat conducting performance, is environmentally friendly and free from halogen, conforms to the EU ROHS (Restriction of the use of certain Hazardous Substances) and REACH (Regulation concerning the Registration, Evaluation, Authorization and Restriction of Chemicals) regulations, and is very suitable for pouring protection of automobile power batteries and modules thereof.

Description

technical field [0001] The invention belongs to the technical field of potting glue, and more specifically, the invention relates to a low-specific-gravity flame-retardant and heat-conducting potting glue for automobile power batteries and a preparation method thereof. Background technique [0002] With the in-depth promotion of the concept of environmental protection, the emission standards of automobile pollutants are becoming more and more stringent. The lightweight of automobiles is an effective way to reduce emissions and save energy. Especially for new energy vehicles, the huge battery system increases the weight of the vehicle and severely limits the cruising range. As the core component of the power battery equipped with new energy vehicles, its energy efficiency performance and safety factor directly affect the quality level of the vehicle. Automotive power batteries are exposed to harsh environments such as extreme temperature, cold and hot cycles, moisture, sand,...

AI Technical Summary

Problems solved by technology

[0003] Related potting materials and their preparation methods have been widely disclosed, but none of these potting adhesives or similar compositions can fully solve the problems of heat dissipation protection and light weight of automotive power battery packs

For example, in order to improve the flame retardant performance of the potting compound, it is usually necessary to add a flame retardant, but conventional halogen-free flame retardants such as aluminum hydroxide, magnesium hydroxide, etc., require a large amount of addition to achieve the desired effect; efficient Halogenated flame retardants are restricted by environmental regulations

In order to improve the thermal conductivity of the potting compound, it is usually necessary to add a large amount of thermal conductive filler, resulting in an increase in the proportion of the potting compound, which greatly increases the overall weight of the power battery after potting, making it difficult to meet the requirements of lightweight

In addition, the addition of a large amount of fillers will also lead to an increase in the viscosity of the potting compound and poor fluidity, which will affect the actual use.

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