Phase-change-material-based thermal management material, preparation method and applications thereof

Abstract

The invention relates to a phase-change-material-based thermal management material, a preparation method and applications thereof, wherein the thermal management material comprises, by mass, 55-90% ofa phase change material, 4-20% of a thermal conduction filler, 4-20% of a flame retardant, and 2-10% of chopped fiber. According to the present invention, by adding an appropriate amount of the chopped fibers, the deformation of the phase change material due to volume expansion or contraction can be effectively prevented, such that the content of the phase change material in the thermal management material can be substantially increased so as to improve the heat storage capacity of the thermal management material and stably regulate and control the temperature.

Description

technical field [0001] The invention relates to the technical field of battery heat management, in particular to a heat management material based on a phase change material, a preparation method and application 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. 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 that are electrically connected to each other. Such medium or large battery modules typically Manufactured to have the smallest possible size and weight, the battery cells stacked in these battery modules are therefore hig...

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Problems solved by technology

However, the phase-change composite material of this patent has a large volume and poor thermal conductivity because it contains porous inorganic fillers, so it is only suitable for use as building materials such as wall insulation materials.

[0007] At present, although there are reports of phase change materials used for battery thermal management, these battery thermal management materials have low thermal conductivity and poor thermal conductivity, which are likely to cause the following problems:

[0008] 1) When a single battery is overheated, the heat cannot be effectively removed, and it is easy to cause uneven temperature among the single batteries in the battery pack;

[0009] 2) When the temperature of the battery pack continues to rise, it will also cause the temperature of the entire battery pack to exceed the tolerance temperature, which will accelerate the deterioration of the battery module, thereby reducing the service life, and some battery packs may even catch fire or explode, bringing greater safety Hidden danger;

[0010] 3) If the battery pack works at high temperature for a long time, the output power of the battery pack will drop significantly with the increase of temperature, so that the battery pack cannot fully exert its maximum performance

[0011] In addition, these thermal management materials also have problems such as poor flame retardancy, easy combustion, poor shape stability and cycle stability of the components made, and easy leakage on the surface of the components.

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