Rupturable sealing structure of cell
AssigneeFuji Electrochemical Co., Ltd.
InventorsTakashi Tsuchida, Kenichi Shinoda, Takao Takase
Life of this patent
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Abstract
A sealing gasket of a cell comprises a circumferential marginal portion constricted between a metal casing and a terminal plate, a center collar through which a collector metal rod penetrates, and an intermediate portion integrally molded with the marginal portion and the center collar and having a thin wall portion tearable by a stretching force applied thereto. The center collar of the gasket is normally separated from the terminal plate but is movable toward the terminal plate by sliding on the collector metal rod in the event that the internal gas pressure within the cell is abnormally developed, whereby the thin wall portion of the gasket is stretched and torn to release the gas.
Claims6
In an alkaline cell of the type including a metal casing having a free end, a terminal plate at said free end, a collector metal rod extending inwardly from said terminal plate, whereby internal gas pressure is developed within said cell, and a rupturable sealing structure for sealing said cell, the improvement wherein said rupturable sealing structure comprises:
- a sealing gasket including a circumferential marginal portion, a center collar portion, and an intermediate portion integrally molded with said marginal portion and said collar portion;
- said marginal portion being constricted between said free end of said metal casing and a peripheral edge of said terminal plate;
- said intermediate portion having a thin wall portion which is tearable upon a stretching force being applied thereto;
- said collar portion being slidably mounted around said collector metal rod for axial sliding movement relative thereto;
- said collar portion normally being inwardly spaced from said terminal plate, but said collar portion being slidable along said collector metal rod toward said terminal plate upon the development within said cell of abnormally high internal gas pressure, whereby said thin wall portion is stretched and ruptured and the gas is released from within said cell.
Dependencies are inferred from the claim text.