PEM fuel cell passive water management

Details PEM fuel cell passive water management PEM fuel cell passive water management

2005-07-12

2005-07-12

Ryan, Patrick Joseph (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S072000

Reexamination Certificate

active

06916571

ABSTRACT:
Water flow field inlet manifolds (33, 37) are disposed at the fuel cell stack (11) base. Water flow field outlet manifolds (34, 38) are located at the fuel cell stack top. Outlet and inlet manifolds are interconnected (41-43, 47, 49, 50) so gas bubbles leaking through the porous water transport plate cause flow by natural convection, with no mechanical water pump. Variation in water level within a standpipe (58) controls (56, 60, 62, 63) the temperature or flow of coolant. In another embodiment, the water is not circulated, but gas and excess water are vented from the water outlet manifolds. Water channels (70) may be vertical. A hydrophobic region (80) provides gas leakage to ensure bubble pumping of water. An external heat exchanger (77) maximizes water density differential for convective flow.

REFERENCES:
patent: 5503944 (1996-04-01), Meyer et al.
patent: 5700595 (1997-12-01), Reiser
patent: 5853909 (1998-12-01), Reiser
patent: 6306530 (2001-10-01), Blondin et al.
patent: 6355368 (2002-03-01), Kralick

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