| abstract |
(57) [Summary] [PROBLEMS] To prevent a sudden rise in battery temperature and to prevent electrolyte leakage when an overcharge or short circuit occurs in a non-aqueous electrolyte secondary battery. SOLUTION: In a non-aqueous electrolyte secondary battery using a positive electrode, a negative electrode, a separator disposed between the positive and negative electrodes, and a non-aqueous electrolyte, a separator having a large heat of fusion is used. |