Reduction of voltage loss by voltage cycle through the use...

Details Reduction of voltage loss by voltage cycle through the use... Reduction of voltage loss by voltage cycle through the use...

2011-06-07

2011-06-07

Ruddock, Ula C (Department: 1729)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Means for distributing, storing, or preventing fluid movement

C429S512000

Reexamination Certificate

active

07955752

ABSTRACT:
A fuel cell that includes specially configured bipolar plates that separate the reactant gas flow field in an active area of the fuel cell into a primary flow channels and a secondary channels. In one embodiment, the primary flow channels are in use over the entire operating range of the fuel cell and the secondary flow channels are only in use at high cell current outputs. At low power demands, the primary channels operate at a voltage below 0.8 volts and provides a gas current density of more than 0.2 A/cm2. The secondary flow channels have no gas supply and operate at mass transport limited conditions. Because of this design, voltage cycling is significantly reduced or eliminated, thus increasing the life of the fuel cell.

REFERENCES:
patent: 7022430 (2006-04-01), Enjoji et al.
patent: 7479341 (2009-01-01), Takeguchi et al.
patent: 2002/0142202 (2002-10-01), Li et al.
patent: WO 02/065566 (2002-08-01), None

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