Patent ID: 7833647
Filing Date: 2010-11-16
Classification: H01M,Y02E,Y02P,Y10T

Abstract:
1. A vent closure seal assembly for an electrochemical cell container, said assembly comprising: a closure cup having an aperture to allow electrochemical reaction gas to flow therethrough; a contact member having a defined peripheral shape; a rupturable vent fixed between the closure cup and the contact member to selectively control the flow electrochemical reaction gas through the assembly, said rupturable vent having a peripheral shape that, is not the same as the defined peripheral shape of the contact member; wherein a first diameter of the rupturable vent is equal to a corresponding first diameter of the defined peripheral shape of the contact member along a first common planar axis; wherein a second diameter of the rupturable vent is greater than a corresponding second diameter of the defined peripheral shape of the contact member along a second common planar axis; wherein the first and second common planar axes intersect at a center point of said contact member; and wherein the vent is not rectangular in shape and a plurality of planar protrusions are integrated along a peripheral edge of the rupturable vent.