Patent ID: 6497978
Filing Date: 2002-12-24
Classification: H01M,Y02E

Abstract:
An explosion-proof safety valve assemblage for use in a closed battery comprising:a outer container, an electrode element, having a positive electrode, negative electrode, and a separator, accommodated in said outer container, said explosion-proof safety valve assemblage being secured to an open end portion of said outer container via an insulating gasket integrally with a closing cap; said explosion-proof safety valve assemblage having an explosion-proof safety valve element, a coreless disc-shaped insulator, and a lead cap composed of a metal substrate having an opening at a center portion thereof and being laminated with a metal foil; said explosion-proof safety valve element having a metal substrate laminated with a metal foil; said valve consisting of said metal substrate provided with a single continuous concentrically formed space perforated through the entire thickness of the metal substrate so that the metal foil is concentrically exposed; and both ends of said concentrically formed space ending at a single non-breaking portion at a connecting portion of the metal substrate and the valve.