High thermal conductivity composite material comprising pan-based carbon fiber and patterned graphite sheet and stitched with pitch-based carbon fiber, and method for manufacturing the same

A highly thermally conductive composite material comprising:

• two graphite sheets;
• a first laminate positioned between the graphite sheets, in which one or more prepregs including polyacrylonitrile-based carbon fiber and a thermosetting resin are laminated;
• one or more repeating units laminated between the graphite sheet and the first laminate;
• and
• a plurality of pitch-based carbon fibers penetrating the graphite sheet, the first laminate and the repeating unit in the lamination direction to have both ends protruding,
• wherein the repeating unit includes, sequentially from a direction adjacent to the first laminate, a graphite sheet having a plurality of through holes, and a second laminate in which one or more prepregs including polyacrylonitrile-based carbon fiber and a thermosetting resin are laminated;
• and
• the protruding both ends of the pitch-based carbon fiber are bent in a direction of a surface of the highly thermally conductive composite material.