Patent ID: 6228530
Filing Date: 2001-05-08
Classification: H01M,Y02P,Y10T

Abstract:
A dry cell including a cylindrical cell member and an outer metal jacket for encasing the cell member, the metal jacket being formed by rolling a metal jacket blank of a rectangular metal strip into a cylindrical shape to cause opposing side edges of the metal strip to abut each other and form an abutment joint and by inwardly curling and crimping a lower end of the blank to make a bottom, the cell member being sealed in the metal jacket by inwardly curling and crimping an upper end of the metal jacket, wherein:the metal jacket blank is provided with notches at both corners of a first side edge of the side edges where the abutment joint is formed; andthe notches are respectively adjoined to an upper end and a lower end of a second side edge of the side edges of the metal jacket blank forming a curled abutment joint in a direction which is different from a radial direction of the metal jacket.