| 摘要 |
PROBLEM TO BE SOLVED: To provide a manganese dry cell which has a rupture preventing safety mechanism formed on a sealing body, which safety mechanism has a simple structure, and operates steadily and stably through prevention of the destabilization of the actuating pressure of the safety mechanism that is caused by the irregularity of a mechanism in a manufacturing process and the deterioration of a material quality arising under a service environment. SOLUTION: According to the manganese dry cell 1, a positive electrode cap 4 is caulked to seal an opening 3 of a negative electrode zinc can 2 via an insulating gasket 5 (sealing body). The insulating gasket 5 is made into an almost tabular shape in a sectional view. At the center of the insulating gasket, a current collector insertion hole 5a is formed to allow a current collector 6 to be inserted therein. The periphery 5b of the insulating gasket is bent upward in a state of contact with the negative electrode zinc can 2, and is caulked together with the positive electrode cap 4 at the opening end 2a of the negative electrode zinc can 2. On a plane between a contact portion 5c between the insulating gasket 5 and the negative electrode zinc can 2, and the current collector insertion hole 5a, at least one projection 7 is formed, which partially improves the deformation strength of the insulating gasket 5 at its periphery. COPYRIGHT: (C)2008,JPO&INPIT |
