| 摘要 |
PROBLEM TO BE SOLVED: To improve volume efficiency while securing sealabilities such as water by reducing an occupancy area of flange parts of a case material while preventing a problem such as insulation failure by damage on an inner surface of a battery exterior. SOLUTION: Bend parts 9 bent in the same direction in a condition of being mutually overlapped are formed in the flange parts 8 of a pair of upper and lower case materials 2a, 2b constituting the battery exterior 2. The formation positions of the bend parts 9 are positions which are separated from inner peripheral side end part by only a prescribed distance L of the flange parts 8 in which resin sumps 10 are formed in heat welding the pair of upper and lower case materials 2a, 2b. The prescribed distance L is set as a distance by which a load is not applied to the resin sumps 10 in forming the bend part 9. COPYRIGHT: (C)2005,JPO&NCIPI |
