Welded current collector plates in non-aqueous electrolyte secondary cells

摘要

In a nonaqueous electrolyte secondary cell comprising a rolled-up electrode unit 4 encased in a cell can 1, a striplike current collector forming an electrode has an edge 48 projecting from at least one of opposite ends of the electrode unit. A current collecting plate 5 is joined to the current collector edge 48. A plurality of circular-arc protrusions 52 projecting in a circular-arc cross section and a plurality of slit pieces 53 are formed radially on the current collecting plate 5 and opposed to the current collector edge 48. The collecting plate 5 is welded to the current collector edge 48, with the protrusions 52 and the slit pieces 53 biting into the current collector edge 48, whereby high current collecting performance is available.