▎ 摘　　要

NOVELTY - Preparation of graphene insulating and thermally conductive sheet involves (1) preparing core material of thermal conductive sheet, (2) preparing material for middle layer of thermal conductive sheet, (3) preparing surface layer material of thermal conductive sheet, (4) injecting the core material of the thermal conductive sheet into core mold of thermal conductive sheet, hot press forming, obtaining core of the thermal conductive sheet, (5) coating the material of the middle layer of the thermal conductive sheet on the surface of the core of the thermal conductive sheet, hot pressing to form the middle layer of the thermal conductive sheet, (6) coating the surface material of the thermal conductive sheet on the surface of the middle layer of the thermal conductive sheet, and hot pressing to form surface layer of thermal conductive sheet. In step (1), the core material of the thermal conductive sheet comprises graphene and polymer. USE - Preparation of graphene insulating and thermally conductive sheet for electric vehicle power supply. ADVANTAGE - The method prepares a thermally conductive sheet in which graphene fibers are oriented in the thickness direction, so that the prepared thermally conductive sheet obtains excellent thermal conductivity. DETAILED DESCRIPTION - Preparation of graphene insulating and thermally conductive sheet involves (1) preparing core material of thermal conductive sheet, (2) preparing material for middle layer of thermal conductive sheet, (3) preparing surface layer material of thermal conductive sheet, (4) injecting the core material of the thermal conductive sheet into core mold of thermal conductive sheet, hot press forming, obtaining core of the thermal conductive sheet, (5) coating the material of the middle layer of the thermal conductive sheet on the surface of the core of the thermal conductive sheet, hot pressing to form the middle layer of the thermal conductive sheet, (6) coating the surface material of the thermal conductive sheet on the surface of the middle layer of the thermal conductive sheet, and hot pressing to form surface layer of thermal conductive sheet. In step (1), the core material of the thermal conductive sheet comprises graphene and polymer. In step (2), the material for the middle layer of the thermal conductive sheet comprises graphene, ceramic powder, and polymer. In step (3), the surface layer material of the thermal conductive sheet comprises metal oxide or metal nitride, and thermoplastic elastomers and other rubbers.