Reactant feed for nested stamped plates for a compact fuel cell

Details Reactant feed for nested stamped plates for a compact fuel cell Reactant feed for nested stamped plates for a compact fuel cell

2007-11-06

2007-11-06

Crepeau, Jonathan (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S010000, C429S006000, C429S006000, C429S047000

Reexamination Certificate

active

11009378

ABSTRACT:
A fuel cell in a fuel cell stack that provides a transition from nested bipolar plates in the active region of the stack to non-nested bipolar plates in the inactive regions of the stack without giving up the reduced stack thickness provided by the nested plates or changing the size of the flow channels. Particularly, the diffusion media layers in the fuel cells are removed in the inactive regions where the bipolar plates are non-nested so that the volume necessary to maintain the size of the flow channels is provided without the need to increase the distance between adjacent MEAs. A thin shim can be provided between the membranes and the plates in the inactive regions to support the membrane where the diffusion media layer has been removed to prevent the membrane from intruding into the flow channels and blocking the reactive flow.

REFERENCES:
patent: 5945232 (1999-08-01), Ernst et al.
patent: 6261710 (2001-07-01), Marianowski
patent: 2003/0129473 (2003-07-01), Lee et al.
patent: 2004/0151974 (2004-08-01), Rock et al.
patent: 123960 (1984-11-01), None
International Search Report PCT/US05/39178 dated Apr. 3, 2007 corresponding to this application.

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