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US 4,052,533 AGranted
Pressure relief flapper vent valve for galvanic cells
AssigneeUnion Carbide Corporation
InventorHenry Heinz, Jr.
Life of this patent
Estimating the term…
Abstract
A galvanic dry cell having a resealable subseal comprising a cup-shaped flapper vent valve having an opening at its center for receiving and contacting the cell's current collector rod and a peripheral edge segment contacting and conforming to the inner wall of the cell's container and adapted for deflecting upwardly thereby providing a resealable vent path at the valve-container interface.
Claims13
A galvanic cell comprising a container having an open end and an inner disposed anode;
- a depolarizer-cathode within said container;
- a porous separator disposed between said anode and said cathode;
- an electrolyte wetting said depolarizer-cathode;
- a current collector rod embedded within and projected above said depolarizer-cathode;
- and a resealable flapper vent valve disposed concentrically about the current collector rod over the depolarizer-cathode and contacting the inner wall of the container so as to provide a vent at the valve-container interface for releasing excessive gas pressure within the container, said resealable flapper vent valve comprising a resilient, deformable cupped annulus having an opening at its center through which the top of the current collector rod passes, contacts and projects above, and having its peripheral edge segment deflected upwardly such that at least the bottom peripheral edge of the annulus contacts the inner wall of the container.
2 more elements
Dependencies are inferred from the claim text.