Cylindrical storage battery with spirally wounded electrode assembly

摘要

A cylindrical storage battery having a spirally coiled electrode plate assembly in which the shape of the current collector welded to the end part of the electrode plate assembly is improved and the crossing parts of the rib-formed projections of the current collector and the electrode plate terminal edges are welded with sufficient strength permits a high-rate charge and discharge. A storage battery having a spirally coiled electrode plate assembly 5 comprising a positive electrode plate 1, a negative electrode plate 2 and a separator 6, and rectangular current collectors 7 and 8, the respective one of which being welded respectively to the terminal edges 3 and 4 of the electrode 1 and 2 respectively projecting outward from the upper and the lower end planes of the electrode assembly, the current collector welded to the end part of the electrode plate assembly 5 having a flat plate part 7b provided with rectangular cutout parts 7a, in a radial manner and with equal intervals therebetween at 4 places, which extend from the neighborhood of the center to the outer peripheral edge of the plate part, and rib-formed projections 7d which are formed integrally, bent downward, at the two opposed edge parts 7c of the respective cutout parts and are made to cross the terminal edge of the electrode plate and welded thereto.