Patent ID: 8900738
Filing Date: 2014-12-02
Classification: H01M,Y02E,Y02P

Abstract:
1. A non-aqueous electrolyte secondary battery comprising: a positive electrode; a negative electrode; a separator disposed between the both electrodes; a non-aqueous electrolytic solution comprising an electrolyte salt in an amount of 13% by mass to 25% by mass; and an exterior member made of a laminate material and housing the positive electrode, the negative electrode, the separator and the non-aqueous electrolytic solution, wherein: a polymeric support exists between the separator and at least one of the positive electrode and the negative electrode; the separator is a film containing polyethylene and polypropylene; the amount of polypropylene in the separator is greater than 0% by mass and less than or equal to 10% by mass; the separator has a uniform thickness of from 5 to 20 μm; and the battery has a maximum attained temperature not higher than 100° C. using a nail piercing safety test at the time of conducting the safety test.