| 摘要 |
The present invention mainly relates to a cylindrical battery provided with a wound-type electrode plate group, and to a manufacturing method thereof. An object of the present invention is to provide a manufacturing method by which a cylindrical battery can be produced at high productivity, without a welding electrode attaching to a current collector plate during connection of the current collector plate to a battery case. In the present invention, the maximum diameter of a hollow cylindrical portion of an electrode plate group is ⅙ or more and 2/6 or less of that of the electrode plate group; and a current collector having one first projection and a plurality of second projections are used. The one projection and the plurality of second projections are disposed on a face of the current collector plate facing an inner bottom face of the battery case, and protrude toward the inner bottom face side of the battery case. The height of the first projection is higher than that of the second projection. Further, the welding electrode used during connection of the current collector plate to the battery case has a maximum diameter of 60% or more and 100% or less of that of the hollow cylindrical portion of the electrode plate group, and is 4 mm.
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