Silicone rubber composite material for lithium battery pack frame and preparation method

Abstract

The invention relates to a silicone rubber composite material for a lithium battery pack frame and a preparation method. The silicone rubber composite material comprises the following components: 50-100 parts of silicone rubber, 5-500 parts of a heat conducting agent A, 0.5-1 part of a heat conducting agent B, 2-5 parts of a flame retardant, 1-3 parts of a reinforcing agent and 5-20 parts of a vulcanizing agent, wherein the silicone rubber is a compound of methyl vinyl silicone rubber and hydroxyl silicone rubber, the heat conducting agent A is a compound of aluminum oxide, boron nitride and aluminum nitride, the heat conducting agent B is graphene, and the flame retardant is magnesium hydroxide modified by lauryl sodium sulfate. The silicone rubber composite material for the lithium battery pack frame takes the silicone rubber as a raw material, has the characteristics of excellent high and low temperature resistance, weather resistance, acid and alkali resistance, hydrophobicity, hydrophobic migration, electrical insulation and the like, can be used for a long time within the temperature range of -90 to 300 DEG C without loss in original strength and elasticity, and is long in service lifetime.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a silicon rubber composite material used for a lithium battery pack frame and a preparation method thereof. Background technique [0002] Lithium-ion batteries will be the leading battery product in the next 20 years, and the global enthusiasm for investment in the lithium-ion battery market and the electric vehicle market in related industries has never diminished. Lithium-ion battery module is the power source and core component of electric vehicles. It is composed of multiple single batteries connected in series and parallel in different forms. Due to the complex driving conditions of electric vehicles, more heat will be generated during battery use, which will increase the internal temperature of the battery, especially for modules composed of multiple single batteries, the temperature inside the module will rise faster. If the heat cannot Timely releas...

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Problems solved by technology

[0003] However, the existing power battery modules are generally arranged in rigid insulating frames, which are generally made of plastic materials or metal materials, which have unstable chemical and physical properties, poor electrical performance, easy to fall off, difficult installation, and high cost. disadvantages

[0004] Patent CN 108463903A discloses a battery module including a belt frame and its frame, which includes at least one cell, the frame includes a lower plate for supporting the lower end surface of the cell, vertically from the four corners of the lower plate a belt-shaped side plate extending and arranged adjacent to the outermost side of the cell, and an upper plate coupled to the upper end of the side plate to cover the upper portion of the cell, the frame is made of sheet metal plate material, which can be assembled by a welding process, However, the frame made of metal materials has disadvantages such as unstable chemical and physical properties, poor electrical performance, easy to fall off, difficult to install, and high cost.

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