Fuel cell system back-pressure control with a discrete valve

Details Fuel cell system back-pressure control with a discrete valve Fuel cell system back-pressure control with a discrete valve

2007-06-26

2007-06-26

Yuan, Dah-Wei (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S010000

Reexamination Certificate

active

10785654

ABSTRACT:
A fuel cell system that employs a two-position valve at the cathode exhaust gas output for controlling the pressure within the fuel cell stack to control the stack relative humidity. In one embodiment, the two-position valve is switchable between a fully open and a fully closed position, where the valve is opened when the fuel cell system is operating at a low operation temperature and the valve is closed when the fuel cell system is operating at a high operation temperature. A fixed restriction valve is provided in parallel with the two-position valve so that when the two-position valve is fully closed, the proper amount of pressure is provided at the cathode output. In another embodiment, the two-position valve employs sized leak paths so that when the two-position valve is in the closed position, the cathode exhaust gas can still flow through.

REFERENCES:
patent: 6378484 (2002-04-01), Russell et al.
patent: 2004/0258968 (2004-12-01), Voss et al.
patent: 2005/0164057 (2005-07-01), Pospichal et al.

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