Importance

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Abstract

An improvement is provided in the shape of current collectors welded to the respective terminal edges of electrode plates projecting from the upper and the lower end plane of a spirally coiled electrode plate assembly incorporated in a cylindrical storage battery. In the preferred embodiment, the current collector formed essentially of a rectangular flat plate is provided with an I-shaped cutout hole which passes the center of the plate and ends inside the plate near to its outer peripheral edge and two of rectangular cutout parts which are approximately at a right angle to the I-shaped hole and extend from the neighborhood of the center of the plate to its outer peripheral part without intersecting the I-shaped hole, downward rib-formed projections being respectively formed integrally at the edge parts of the cutout hole and the respective cutout parts, the respective rib-formed projections crossing the terminal edges of the electrode plate and being welded to the terminal edges at a plurality of spots. Particularly, the rib-formed projection of the I-shaped cutout hole crosses also the electrode plate coiling start terminal part of the electrode plate assembly and hence can secure welding spots over a wide region in the diameter direction of the electrode plate assembly and thus permits high rate charge and discharge.

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First Claim