| 摘要 |
PROBLEM TO BE SOLVED: To provide a cylindrical secondary cell having high output density and a long life. SOLUTION: A collector terminal 11 comprises a disk-shaped flat plate part 12 and a columnar protruded part 3 protruded to one side from the center of this flat plate part 12. In an opposite side to a side provided with the protruded part 3 of the flat plate part 12, a plurality of slightly protruded protrusion parts 13 are formed. This protrusion part 13, in accordance with its forming length, is divided into three kinds of protrusion part 13a to 13c. In the case of welding the protrusion part 13 to a lead of a positive electrode plate of a collector, as going to an outside from an inside on a diametric direction, a lead per one peripheral round and the number of contact points of the protrusion part 13 are increased, dispersion of a space of this contact point is also set to within a small range. |
