| 摘要 |
PROBLEM TO BE SOLVED: To provide a flat nonaqueous electrolyte secondary battery having a square external shape with improved sealing strength by calking. SOLUTION: The flat nonaqueous electrolyte secondary battery is composed of: a bottomed cylinder-shaped outer can 1 having an open end folded inside by calking; a bottomed cylinder-shaped sealing can 3 having a flange part 4 projecting outward at the open end which is arranged at the open part of the outer can 1 so as to be surrounded by the folded part 2 of the outer can 1; and an insulation gasket 5 arranged between the folded part 2 of the outer can 1 and the flange part 4 of the sealing can 3. A relation, 1.02≤R2/(R1-t<SB>R1</SB>-d)≤1.08 (1), is satisfied. COPYRIGHT: (C)2006,JPO&NCIPI |
