NOVELTY - The material has a structure including a polymer-based heat-dissipating layer (10), which is filled with a heat-dissipating filler and a polymer-based neat layer (11) that is not filled with the heat-dissipating filler arranged in alternating pattern and integrated such that heat generated in a heat source is dissipated through the dissipating layer. The dissipating filler is oriented in a direction in relation to thickness of the dissipating filler to transfer the heat in a through-plane direction. The dissipating layer and neat layer form a battery case for fixing a pouch-type battery.    USE - Heat-dissipating polymer-based composite material i.e. polycarbonate powder material, for a battery case of a pouch-type lithium secondary battery i.e. pouch cell, for an electric vehicle i.e. plug-in hybrid electric vehicle. Can also be used for a motor vehicle e.g. passenger automobiles such as sports utility vehicles (SUV), bus, lorry, commercial vehicle, watercraft e.g. boat and ship, aircraft, hybrid vehicle e.g. gasoline-powered hybrid vehicle and electric-powered hybrid vehicle, and hydrogen-powered vehicle.    ADVANTAGE - The heat-dissipating layer with the heat-dissipating filler and the neat layer without the heat-dissipating filler are stacked in an alternating pattern so as to effectively dissipate the heat generated in the battery, thus ensuring lifespan and stability of a high capacity battery pack for an electric vehicle. The heat-dissipating layers and the neat layers stacked into a set of layers are passed through an oven and compressed by a compressor in upward and downward directions, so that the compressed heat-dissipating layers and neat layers are cut in a direction perpendicular to an extrusion direction, thus improving heat transfer characteristics and heat conduction characteristics in a through-plane direction. The neat layer that is not filled with the heat-dissipating filler is interposed between the layers so as to prevent deterioration in mechanical properties caused in the material prepared by filling an entire composite material with the heat-dissipating filler, thus improving cutting efficiency, and hence dissipating the heat generated from the heat source effectively, efficiently and uniformly outside when the material is attached to a flat plate as the heat source for the electric vehicle.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a method for manufacturing a composite material for a battery case.    DESCRIPTION OF DRAWING(S) - The drawing shows a side view of a composite material for a battery case.    Polymer-based heat-dissipating layer (10)    Polymer-based neat layer (11)    Filler filled portion (16)    Resin filled portion (17)