| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery having a high capacity and high sealing performance. SOLUTION: A cylindrical battery with a slightly higher height than a regulated height is placed on a lower die 22, and an upper die 21 having a peripherally projecting part 21a with a slightly bigger inner diameter than the maximum outer diameter of the battery can 5 of this cylindrical battery is used. An annular groove 5a formed on the can wall in the vicinity of the sealed part of the battery can 5 (5b, 5c) of the cylindrical battery while having the bottom part on the inward side in the diameter direction of the battery is compressed in the vertical direction of the battery by the upper die 2 as the curved can wall parts 5c above and below the groove 5a are surrounded by the peripherally projecting part 21a. Thereby, the cylindrical battery is manufactured by setting the battery height at the regulated height.
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