Battery can having vent and asymmetric welded cover

Details Battery can having vent and asymmetric welded cover Battery can having vent and asymmetric welded cover

2006-05-24

2009-08-11

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

Having specified venting, feeding or circulation structure

Venting structure

C429S176000, C220S203080

Reexamination Certificate

active

07572545

ABSTRACT:
An electrochemical cell is provided with an enhanced pressure relief vent formed in a closed end of the cell container that allows for effective venting of gas from the closed end of the container. The cell includes a container having a first end, a second end, a side wall extending between the first and second ends, and an end wall extending across the first end. The cell has a positive electrode, a negative electrode, and an aqueous alkaline electrolyte, all disposed in the container. The cell further includes a pressure relief vent mechanism having a reduced thickness groove formed in the end wall of the container. A cover is welded to the closed end wall of the container over the pressure relief vent mechanism and is welded via at least three welds, wherein two adjacent welds are angularly separated by more than 120°.

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Patent Cooperation Treaty (PCT), International Search Report and Written Opinion for Application PCT/US2007/012382, filed May 23, 2007, mailed Nov. 6, 2007, European Patent Office, Netherlands.

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