| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery having reduced internal resistance by uniformly collecting power from the inner and outer peripheries of an electrode group even when using a cylindrical collecting lead. SOLUTION: In the cylindrical secondary battery, a one-pole collector is welded to a one-pole core body which extends from the upper side of the spiral electrode group having a positive electrode plate and a negative electrode plate spirally coiled with a separator therebetween, and the collector is welded via the collecting lead in which an internal space is formed, to a sealing body which seals an opening portion of a cylindrical metal external can. The collecting lead 10 in which the internal space is formed includes a top portion 11 to be welded to the sealing body and a bottom portion 12 to be welded to the collector. The bottom portion 12 of the collector lead 10 includes a plurality of protruded portions 12b to be points of welding to the collector, formed on a plurality of concentric circles around the center point of the collector lead 10. COPYRIGHT: (C)2010,JPO&INPIT
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