Fuji Electrochemical Co., Ltd.

Takashi Tsuchida

Kenichi Shinoda

Kohei Yamamoto

Toshio Suzuki

Takao Takase

Noriaki Sakamoto

In a gasket of a cell comprising a marginal portion, an annular center portion and an intermediate portion integrally formed with each other, the intermediate portion of the gasket has an inwardly projecting annular thin wall surrounding the annular center portion with an annular space therebetween. The annular thin wall has, generally, an inverted frusto-conical shape and is provided at the outer surface thereof with an annular horizontal groove and a vertical groove intersecting with each other.

Rupturable safety sealing gasket of cell

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.

Rupturable sealing structure of cell

In an alkaline battery hermetically sealed by fusion of an insulator containing silicon oxide such as glass interposed between an annular metal cover electrically connected to one electrode of the battery and a metal member connected to the other electrode of the battery, an annular packing is disposed inside the annular metal cover in abutment therewith, and a metal collector plate is connected to the metal member and disposed below the insulator. The peripheral edge of the metal collector plate is tightly held against the inner periphery of the packing to define a closed space between the insulator and the collector plate.

Growing community of inventors

Kosai, Japan

Takashi Tsuchida