Abstract: A cylindrical battery provided with a battery case acting also as one polarity terminal with a cylindrical one polarity electrode disposed inside, and another polarity terminal member connected electrically with a lead plate to another polarity electrode installed through a cylindrical separator in a hollow zone of said one polarity electrode, which comprises providing an annular descending wall placed closely upon a top opening inside peripheral edge of said cylindrical separator on the lower surface of an annular insulating packing for insulating the battery case and said another polarity terminal member, preventing the battery capacity reduction due to self-discharge.

Abstract: A method of forming a separator for a cylindrical battery comprising: disposing a cylindrical or columnar electrode on a metal mold having a circular groove through one or more layers belt-shaped separator being wider than the length of said electrode, pushing said electrode into said groove to contact said separator to a part of the periphery of said electrode, pressing residual both ends of said separator along the residual periphery of said electrode, and continuously or discontinuously welding an overlapped portion of both ends of said separator.