| 摘要 |
A closed-bottomed circular tube-like battery can has a bottom wall section and a side wall section that respectively have uniform predetermined thicknesses. Alternatively, the battery can has a side wall section having a predetermined thickness uniform in the entire side wall section and also has a bottom wall section having a thickness increasing from the peripheral edge of the bottom wall section toward its center. The battery can uses a reduced amount of material and is reduced in weight without a reduction in rigidity. |
