MANGANESE DRY BATTERY

A manganese dry battery having a high reliability for explosion prevention by employing a new gasket shape, which is easily manufactured and controlled in terms of its dimensions, as well as an explosion proof mechanism. The manganese dry battery comprises a gasket (3) having an internal cylinder (13) which closely adheres to and holds a carbon rod, an external cylinder (14) which closely adheres to an inner wall of an opening of a zinc can, and a connecting portion (15) which connects the internal cylinder and the external cylinder; and a cathode terminal plate which fits to a top surface of the carbon rod, the battery being sealed by caulking an opening end of the zinc can and an outer periphery of the cathode terminal plate via an upper end of the external cylinder, wherein a cut-out portion (16) is provided in at least a part of an upper portion of the internal cylinder of the gasket, such that the gasket is deformed upon an increase in battery internal pressure to form a gap between the gasket and the carbon rod, and a gas is released from a vent hole provided to the cathode terminal plate through the gap. The present invention provides a manganese dry battery having a high reliability for explosion prevention by employing a new gasket shape, which is easily manufactured and controlled in terms of its dimensions, as well as an explosion proof mechanism. The manganese dry battery comprises a gasket having an internal cylinder which closely adheres to and holds a carbon rod, an external cylinder which closely adheres to an inner wall of an opening of a zinc can, and a connecting portion which connects the internal cylinder and the external cylinder; and a cathode terminal plate which fits to a top surface of the carbon rod, the battery being sealed by caulking an opening end of the zinc can and an outer periphery of the cathode terminal plate via an upper end of the external cylinder, wherein a cut-out portion is provided in at least a part of an upper portion of the internal cylinder of the gasket, such that the gasket is deformed upon an increase in battery internal pressure to form a gap between the gasket and the carbon rod, and a gas is released from a vent hole provided to the cathode terminal plate through the gap. Cette invention se rapporte à une pile sèche au manganèse ayant une grande fiabilité du point de vue de la prévention des explosions et utilisant à cet effet une nouvelle forme de joint étanche, qui est facilement fabriqué et dont les