| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery, having reduced internal resistance and superior high-temperature conservation and overcharging characteristics by preventing wrinkling of the separator, even if a polyvinylidene fluoride resin is used which has superior electrolyte sustainment as a separator material. SOLUTION: This nonaqueous electrolyte secondary battery has a separator 10, formed with a composite resin film integrated by filling a reinforcing material layer 11 with a polyvinylidene fluoride resin 12 or a separator 20 formed with a composite resin film, in which a polyvinylidene fluoride resin layer 21 and a reinforcing material layer 22 are laminated. With the polyvinylidene fluoride resin 12, filled with the reinforcing material layer 11 for integration or the polyvinylidene fluoride resin layer 21 laminated on the reinforcing material layer 22, the swelling of the polyvinylidene fluoride resin, if swollen, in the cross and longitudinal directions, is restricted by the reinforcing material 11 or 22, wrinkling of the separator 10 or 20 will not occur. |
