(JP10241651-A)      An aperture upper edge portion of a metallic bottomed cell container and a peripheral edge portion of a metallic bottomed cell container and a peripheral edge portion of a metallic sealing plate are hermetically sealed by laser welding. A through-hole is provided at a centre portion of the sealing plate, and a rivet which also functions as a terminal is clamped, hermetically sealed and fixed through a gasket. An exhaust hole is provided between the terminal and the peripheral edge portion of the sealing plate, and this exhaust hole is closed by a metal foil, thus providing the explosion-proof safety valve.    ADVANTAGE -   By reliably actuating the explosion-proof valve with a simple structure and without sacrificing the capacity, the safety of the battery is to be ensured. With such a simple structure, the valve operates accurately to prevent fault. The sealing plate is continuously manufactured in a hoop-like shape.    (JP11025935-A)      An aperture upper edge portion of a metallic bottomed cell container and a peripheral edge portion of a metallic bottomed cell container and a peripheral edge portion of a metallic sealing plate are hermetically sealed by laser welding. A through-hole is provided at a centre portion of the sealing plate, and a rivet which also functions as a terminal is clamped, hermetically sealed and fixed through a gasket. An exhaust hole is provided between the terminal and the peripheral edge portion of the sealing plate, and this exhaust hole is closed by a metal foil, thus providing the explosion-proof safety valve.    ADVANTAGE -   By reliably actuating the explosion-proof valve with a simple structure and without sacrificing the capacity, the safety of the battery is to be ensured. With such a simple structure, the valve operates accurately to prevent fault. The sealing plate is continuously manufactured in a hoop-like shape.    (US6132900-A)      An aperture upper edge portion of a metallic bottomed cell container and a peripheral edge portion of a metallic bottomed cell container and a peripheral edge portion of a metallic sealing plate are hermetically sealed by laser welding. A through-hole is provided at a centre portion of the sealing plate, and a rivet which also functions as a terminal is clamped, hermetically sealed and fixed through a gasket. An exhaust hole is provided between the terminal and the peripheral edge portion of the sealing plate, and this exhaust hole is closed by a metal foil, thus providing the explosion-proof safety valve.    ADVANTAGE -   By reliably actuating the explosion-proof valve with a simple structure and without sacrificing the capacity, the safety of the battery is to be ensured. With such a simple structure, the valve operates accurately to prevent fault. The sealing plate is continuously manufactured in a hoop-like shape.