| abstract |
A nonaqueous electrolyte battery has a spirally coiled electrode body ( 10 ) including a cathode ( 11 ) having a cathode active material and an anode ( 12 ) having an anode active material which are coiled through a separator ( 13 ) in a battery can ( 1 ). As the separator ( 13 ), is used a separator having a plurality of laminated microporous films made of polyolefine which have different film layer thickness and average pore size. Specially, the separator ( 13 ) has three or more layers of microporous films made of polyolefine laminated. Further, the outermost layer of the separator is made of porous polypropylene and at least one layer of inner layers is made of porous polyethylene. The total of the thickness of layers made of porous polyethylene is located within a range of 40% to 84% as thick as the thickness of the separator. Thus, the temperature of a battery can be controlled, a reliability is enhanced and a productivity and cyclic characteristics are improved. |