▎ 摘　　要

NOVELTY - The tank (1) has an outer cover (3) provided with an additive part to increase thermal conductivity of the outer cover. An internal cover (2) and the outer cover are formed by composite reinforcement fiber material or thermoplastic resin. The additive part comprises graphene particles i.e. nano-graphene sheets, which contain carbon, where thickness of the additive part is 0.5-10 nm and length of the additive part is 0.5-10 mm. The outer cover comprises mass particles proportion, where the fiber material comprises carbon fibers, glass fibers or basalt fibers. USE - Composite tank for storing gas i.e. hydrogen (claimed), under pressure. ADVANTAGE - The outer cover is provided with the additive part to increase thermal conductivity of the outer cover so as to avoid mechanical property loss of the tank and simplifying structure of the tank in an inexpensive manner. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a composite tank. Composite tank (1) Internal cover (2) Outer cover (3)