Thermal conduction potting silica gel based on phase-changing microcapsule and preparation method of thermal conduction potting silica gel

Abstract

The invention relates to thermal conduction potting silica gel based on a phase-changing microcapsule and a preparation method of the thermal conduction potting silica gel. The thermal conduction potting silica gel is prepared from the following components by mass percent: 50 to 90 percent of dual-component potting silica gel, 5 to 25 percent of phase-changing microcapsules and 5 to 25 percent ofsurface-treated thermal conduction filler. The preparation method comprises the following steps: treating the surface of the thermal conduction filler; preparing the thermal conduction composite filler; preparing a component A and a component B in the dual-component potting silica gel; preparing a component A1 and a component B1 in the thermal conduction potting silica gel; and preparing the thermal conduction potting silica gel. According to the preparation method, the surface treatment is performed on the thermal conduction filler in the preparation process, so that the dispersity of the thermal conduction filler in a silica gel matrix is improved, and the thermal conduction performance of the thermal conduction potting silica gel is improved; and by adding the phase-changing microcapsule, the thermal conduction potting silica gel has the heat-storage temperature control performance. The thermal conduction potting silica gel has good thermal conduction performance and heat-storage temperature control performance.

Description

technical field [0001] The invention relates to the technical field of battery heat management, in particular to a phase-change microcapsule-based heat-conducting 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 chargin...

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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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