NOVELTY - The nonaqueous electrolyte battery (30) comprises a battery element (10), and a package member for packaging the battery element. The package member includes: a layer, which contains a blackbody material capable of using blackbody radiation and has an emissivity of greater than or equal to 0.6; an outer layer film; a metal foil; an inner layer film; and an adhesive layer. The blackbody material: is provided between the outer layer film and the metal foil or between the metal foil and the inner layer film; and comprises a carbon material, a silicate material, and a metal oxide material.    USE - The nonaqueous electrolyte battery such as a lithium ion secondary battery is useful as a drive power source in a mobile phone, a notebook type personal computer and a personal digital assistant.    ADVANTAGE - The thin nonaqueous electrolyte battery has high heat dissipation characteristics and higher capacity and energy density, and exhibits a high safety even if heat is generated inside the battery.    DETAILED DESCRIPTION - The nonaqueous electrolyte battery (30) comprises a battery element (10), and a package member for packaging the battery element. The package member includes: a layer, which contains a blackbody material capable of using blackbody radiation and has an emissivity of greater than or equal to 0.6; an outer layer film; a metal foil; an inner layer film; and an adhesive layer. The blackbody material: is provided between the outer layer film and the metal foil or between the metal foil and the inner layer film; comprises a carbon material, a silicate material, and a metal oxide material; and has an average particle diameter of less than or equal to 1 mu m. The inner layer film has a thickness of 10-50 mu m. The blackbody material layer comprises the blackbody material and a base resin. The blackbody material is dispersed in the inner and outer layer films and the adhesive layer, where a content of the blackbody material in the outer layer film is 50-80 wt.% and a content of the blackbody material in the inner layer film and the adhesive layer is 60-80 wt.%.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a nonaqueous electrolyte battery.    Battery element (10)    Tight sealing members (16)    Battery element receiving element (28)    Adhesive film (29)    Nonaqueous electrolyte battery. (30)