Nonaqueous electrolyte secondary battery and method of manufacturing nonaqueous electrolyte secondary battery

摘要

This invention provides a nonaqueous electrolyte secondary battery comprising an electrode group (22) having a structure formed by spirally winding a positive electrode and a negative electrode with a separator (23) interposed therebetween and compressing a resultant coil in a direction of diameter; a nonaqueous electrolyte with which said electrode group (22) is impregnated; and a film jacket (21) in which said electrode group (22) is housed, wherein a surface of said electrode group (22) to which a stacked structure is exposed has a shape meeting: 0.9 wherein L2 is a thickness of a most multilayered portion in a region (X) of the surface except curved-layer-regions and L1 is a thickness of an end portion which is one of end portions of the region (X) except the curved-layer-regions and is equal in number of layers to L2.