Patent ID: 6610437
Filing Date: 2003-08-26
Classification: H01M,Y02E

Abstract:
A closure assembly for a sealed battery comprising:a first insulating sheet; a thin metal sheet, positioned on top of the first insulating sheet, provided with a rupture portion, wherein the first insulating sheet has a pressure receiving portion defined in one part of the first insulating sheet; the first insulating sheet and the thin metal sheet being restricted at a position surrounding the pressure receiving portion; the rupture portion being positioned above said pressure receiving portion; and an external electrode terminal of the battery is electrically connected to an internal electrode of the battery through the rupture portion of the thin metal sheet, so that, upon an abnormal increase in pressure within the battery, the pressure receiving portion of the first insulating sheet expands, whereby the rupture portion of the thin metal sheet ruptures, so as to break the electrical connection between the external electrode terminal and the internal electrode of the battery.