Patent ID: 6265097
Filing Date: 2001-07-24
Classification: B65D,H01M,Y02E,Y10T

Abstract:
A cleavage safety valve for a metal vessel, the vessel having, a plate thickness and including an air vent hole having a diameter, the valve comprising:a piece of metal foil comprising a cental portion and an outer periphery that is connected to the vessel by cold welding, the metal foil further comprising a thin-walled portion disposed radially inward from and adjacent to the outer periphery, the thin-walled portion being created by the cold welding of the outer periphery of the metal foil to the vessel, the thin-walled portion being free of cracks and scores, the metal foil covering the air vent hole to provide a hermetic seal over the hole, the central portion of the metal foil having a plate thickness, the thin-walled portion of the metal foil having a plate thickness that is less than the plate thickness of the central portion,whereby an increased internal pressure inside the metal vessel above a predetermined value results in a cleavage of the metal foil at said thin-walled portion.