Metal jacket and dry cell using the same.

摘要

An outer metal jacket (6) for a dry cell, prepared by butting a rectangular metal plate (7) at both side edges (7a, 7b) and joining the butted part by welding or bonding to make a cylindrical body, characterized in that a part (10) having smaller mechanical strength is integrally provided on at least one of the upper and lower rims (6a) of said cylindrical body as a safety mechanism; when the inner pressure is increased by any reason originated from an electrochemical cell system accommodated therein, the safety mechanism is opened outwardly and the increased pressure is reduced therethrough.