Cylindrical storage battery

摘要

A cylindrical storage battery comprises a spirally coiled electrode plate assembly which includes positive and negative electrode plates spirally wound with a separator interposed therebetween. Upper and lower current collectors are welded to the upper and lower ends of the electrode plate assembly. The electrode plate assembly and the current collectors are housed in a metal casing, and an upper end of the casing is closed by a sealing plate. The upper current collector and the sealing plate are electrically connected through a lead terminal which is securely and reliably connected to the sealing plate. The lead terminal has one end portion formed with a hole, and this hole is fitted on a projected portion formed on a lower surface of the sealing plate. Around the portion of the lead terminal surrounding the hole is formed a projection or projections which is/are welded to the lower surface of the sealing plate.