Preparation method of graphene insulating heat-conducting sheet for electric vehicle power supply

Abstract

The invention discloses a preparation method of a graphene insulating heat-conducting sheet for an electric vehicle power supply. The preparation method comprises the following steps of: (1) well mixing matrix resin, graphene fibers and heat-conducting powder by using a stirring device to obtain a mixture; (2) pouring the mixture into an annular groove of a forming device, and starting the forming device to enable the annular groove to rotate around the center of the forming device; orienting the graphene fibers in the mixture along the flowing direction; and meanwhile, heating the mixture to obtain an annular solid; (3) putting the annular solid in an oven for heating and curing; and (4) slicing the heated and cured annular solid in the radius direction of the circular ring by adopting a slicing device to obtain the heat-conducting sheet with the graphene fibers in oriented arrangement in the thickness direction. According to the preparation method of the graphene insulating heat-conducting sheet for the electric vehicle power supply, the heat-conducting sheet with graphene fibers in oriented arrangement in the thickness direction is prepared, so that the prepared heat-conducting sheet has better heat-conducting property.

Description

Technical field [0001] The present invention relates to the technical field of thermal conductive sheets, and in particular to a graphene insulating thermal conductive sheet for electric vehicle power supplies and a preparation method thereof. Background technique [0002] Graphene is a new material in which hybrid-connected carbon atoms are tightly packed into a single-layer two-dimensional honeycomb lattice structure. Graphene has excellent optical, electrical, and mechanical properties and has important application prospects in materials science, micro-nano processing, energy, biomedicine, and drug delivery. It is considered a revolutionary material in the future. [0003] In addition, graphene has very good thermal conductivity properties. The thermal conductivity of pure defect-free single-layer graphene is as high as 5300W / mK, which is the carbon material with the highest thermal conductivity so far, higher than single-walled carbon nanotubes (3500W / mK) and multi-wall...

AI Technical Summary

Problems solved by technology

[0005] However, due to the high operating power required by the car, this also leads to the phenomenon that the power supply of electric vehicles must have a large amount of heat. During operation, heat conduction sheets with excellent performance are required to conduct heat and dissipate heat to reduce the temperature of the power supply, so as to ensure the stable operation and safety of the power supply.

The heat conduction sheets with traditional structures prepared by traditional methods are complicated in structure, difficult to install, and have poor mechanical properties. When people apply graphene to the heat conduction structure of automobile power supplies, there are also problems of complex structure of heat conduction sheets and limited improvement in mechanical properties, and the surface layer of heat conduction sheets is not smooth. It is flexible, resulting in a loose fit with the vehicle power supply, which greatly reduces its heat conduction and heat dissipation effect, and affects the stability and safety of the electric vehicle power supply operation

At the same time, the insulation and heat conduction sheets prepared by traditional methods generally have the problem of a cliff-like decline in thermal conductivity after the thickness of the heat conduction sheet increases to a certain thickness, which cannot meet the diverse requirements of the current electric vehicle power supply for the size of the heat conduction sheet