Battery pack device with graphene assisting in heat dissipation of phase-change material

Abstract

The invention provides a battery pack device with graphene assisting in heat dissipation of phase-change material. The device comprises a plurality of battery cells, a graphene film, a phase change layer and an automatic heat dissipation heat preservation grid, wherein the plurality of battery monomers form a battery pack, the middle of a graphene film is in contact with a battery monomer shell, two edges of graphene are embedded into the phase change layer, the phase change layer is made of a graphene / organic composite shape-stabilized phase change material, and the automatic heat dissipationheat preservation grid comprises a heat dissipation contact, a heat dissipation substrate and a heat dissipation grid. The good heat conduction performance of graphene in a two-dimensional plane is utilized, overheat is transferred to the phase change layer, the phase change reaction absorbs a large amount of heat, then the over-temperature of the battery pack is effectively controlled, and the battery monomers have good temperature uniformity. When the external environment temperature is too low, heat generated by the battery pack is accumulated in the phase change layer, so that the workingtemperature of batteries is effectively ensured.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery pack device in which graphene-assisted phase-change materials dissipate heat. Background technique [0002] Electric vehicles have the dual advantages of low energy consumption and zero emissions. Vigorously developing electric vehicles can alleviate the dependence on traditional energy sources and reduce the environmental pollution caused by the exhaust of internal combustion engine vehicles. The key technology of electric vehicles lies in the power battery, usually a plurality of battery cells are connected in series or in parallel in different forms to form a battery device to provide the required voltage and capacity. The performance of the power battery is also significantly affected by temperature. Too high or too low temperature will affect its performance, and even cause safety problems such as thermal runaway and internal short circuit of the battery. In order to impr...

AI Technical Summary

Problems solved by technology

However, the thermal conductivity of graphene on the vertical two-dimensional plane is low, and there is a problem of slow heat dissipation over temperature; in addition, the thermal insulation effect of the bonding layer is not good when the heat-conducting silica gel is too cold.

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