Invention Grant
US07955752B2 Reduction of voltage loss by voltage cycle through the use of specially formed bipolar plates 有权
通过使用特殊形成的双极板降低电压周期的电压损耗

Reduction of voltage loss by voltage cycle through the use of specially formed bipolar plates
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.
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