| 摘要 |
PROBLEM TO BE SOLVED: To prevent bursting of a flat non-aqueous electrolyte secondary battery under abnormal conditions for improving safety. SOLUTION: This flat non-aqueous electrolyte secondary battery has a metal negative electrode case 4 also serving as a negative electrode terminal and a metal positive electrode case 1 also serving as a positive electrode terminal engaged and sealed via an insulating gasket 6, contains an electrode group and non-aqueous electrolyte internally including a negative electrode 4, a positive electrode 2 and a separator 3 and has larger total positive and negative electrode facing area inside the electrode group than an opening area of the insulating gasket for improving heavy-load discharging property. The volume of the electrode group inside the battery is 40-75% of the total volume of the battery and the volume of the non-aqueous electrolyte inside the battery is 10-25% of the total volume of the battery, and accordingly battery bursting can be prevented while maintaining battery performance. |
