Patent ID: 6703158
Filing Date: 2004-03-09
Classification: H01M,Y02E,Y02P

Abstract:
A cylindrical storage battery comprising an electrode plate assembly including a pair of strip-shaped positive and negative electrode plates and a separator which are spirally wound in such a manner that a distal end portion of one of said electrode plates projects upwardly from said electrode plate assembly while a distal end portion of the other electrode plate projects downwardly from said electrode plate assembly; a pair of upper and lower current collectors welded respectively to the distal end portions of said electrode plates, each of said current collectors being in the form of a flat plate of a substantially rectangular or a substantially circular shape; a metal casing containing said electrode plate assembly, said current collectors and an alkaline electrolyte therein; a sealing plate closing an upper end of said casing in a sealed manner; and a lead terminal electrically connecting said upper current collector to said sealing plate; wherein a projected portion is formed on a lower surface of said sealing plate, one end portion of said lead terminal has a hole fitted on said projected portion of said sealing plate, a projection is formed on that portion of said lead terminal surrounding said hole, and is welded to the lower surface of said sealing plate, and the other end portion of said lead terminal is welded to said upper current collectors, wherein said projection, formed on said one end portion of said lead terminal, has a ring-shape.