| 摘要 |
Provided is a method for manufacturing a circular cylindrical battery. The battery can of the battery includes a circular bottom section, a circular cylindrical side wall which has an open end, and a connection section where the bottom section and the side wall are connected. The method is provided with a step (a) in which the outer diameter (Dc) of the side wall is reduced from an initial diameter (D1) after an electrode group is inserted into the battery can. The step (a) includes: a step (a1) in which the battery can is inserted with the bottom section first, into a ring-shaped die having an inner diameter (Dd) smaller than the diameter (D1); and a step (a2) in which diameter-reducing force is applied to the battery can by relatively moving the die in the direction toward the open end. The contact start portion at which the die and the battery can come into contact with each other and the application of the diameter-reducing force starts is located in the connection section at a position closer to the open end side in the axial direction of the battery can than the inner surface of the peripheral edge of the bottom section. |
