Fuel cell with passive water balance

Details Fuel cell with passive water balance Fuel cell with passive water balance

2007-04-10

2007-04-10

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000

Reexamination Certificate

active

10750609

ABSTRACT:
A fuel cell includes a membrane electrode assembly (46) having a first reactant flow field (80) secured adjacent a first or second surface (48, 50) of the assembly (46) for directing flow of a first reactant adjacent the first or second surface of the assembly (46). The first reactant flow field (80) defines a plurality of two-pass circuits (82, 84, 86, 88), and each two-pass circuit (82) is in fluid communication with both a first reactant inlet (90) for directing the first reactant into the fuel cell (12), and with a first reactant outlet (92) for directing the first reactant out of the fuel cell (12). The plurality of two-pass circuits (82) facilitate water movement (112) toward the reactant inlet (90) to aid in passive maintenance of fuel cell (12) water balance.

REFERENCES:
patent: 4652502 (1987-03-01), Breault et al.
patent: 5686199 (1997-11-01), Cavalca et al.
patent: 5858569 (1999-01-01), Meacher et al.
patent: 5981098 (1999-11-01), Vitale
patent: 6316135 (2001-11-01), Breault et al.
patent: 6322915 (2001-11-01), Collins et al.
patent: 6379833 (2002-04-01), Hill et al.
patent: 6521367 (2003-02-01), Reiser
patent: 6794077 (2004-09-01), Yi et al.

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