Heat conduction and storage multifunctional pouring silica gel and preparation method thereof

Abstract

The invention relates to heat conduction and storage multifunctional pouring silica gel and a preparation method thereof. The heat conduction and storage multifunctional pouring silica gel consists ofthe following components in percentage by mass: 40-89% of double-component pouring silica gel, 5-20% of phase-change microcapsules, 5-20% of heat conduction packing after surface treatment, and 1-20%of a flame retardant, wherein the heat conduction packing consists of small particle size heat conduction packing and large particle size heat conduction packing through mixing. The preparation method comprises the following steps: performing surface treatment on the heat conduction packing; preparing the heat conduction and storage composite packing; preparing the double-component pouring silicagel; preparing components A1 and B1 of the heat conduction and storage multifunctional pouring silica gel; preparing the heat conduction and storage multifunctional pouring silica gel. Due to surfacetreatment on heat conduction packing of different particle sizes, the dispersibility of the packing in a silica gel substrate is improved, the heat conduction properties of the heat conduction and storage multifunctional pouring silica gel are improved, and due to addition of the phase-change microcapsules, the heat conduction and storage multifunctional pouring silica gel has heat storage temperature control properties.

Description

technical field [0001] The invention relates to the technical field of battery heat management, in particular to a heat conduction heat storage multifunctional potting silica gel and a preparation method thereof. Background technique [0002] Batteries such as secondary batteries have been widely used as energy sources for wireless mobile devices, such as power sources for electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles, etc., thereby solving problems caused by vehicles using petroleum fuels. For issues such as air pollution, small wireless mobile devices may use one or more battery cells, while medium or large wireless devices such as vehicles may use medium or large battery modules that include multiple battery cells connected to each other. Or large battery modules are usually manufactured to have the smallest possible size and weight, so the battery cells stacked in these battery modules are highly integrated. [0003] During charging a...

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Problems solved by technology

However, the heat conduction agent in the phase change composite material in this patent application is expanded graphite, which has limited adsorption capacity for phase change materials, and repeated use will cause serious problems of melt flow and permeation migration of phase change materials; in addition, expanded graphite heat conduction fillers It will seriously affect the insulation performance of potting silica gel, which is not conducive to the potting application in conductive occasions. As a thermal management system for power batteries, it has a great impact on the overall safety and reliability of power batteries, so it is not suitable for popularization and application; secondly, the The heat-conducting agent used in the heat-conducting silica gel in the patent application is alumina and magnesia, which have not undergone surface treatment, and the compatibility between the directly added filler and the silica gel matrix is ​​poor, resulting in the uniform dispersion of the heat-conducting filler in the silica gel matrix Poor performance, increased thermal resistance at the phase interface between filler / matrix, and poor thermal conductivity

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