Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Means for distributing – storing – or preventing fluid movement
Reexamination Certificate
2011-07-05
2011-07-05
Yuan, Dah-Wei D (Department: 1727)
Chemistry: electrical current producing apparatus, product, and
Fuel cell, subcombination thereof, or method of making or...
Means for distributing, storing, or preventing fluid movement
C429S443000, C429S444000, C429S452000, C429S457000
Reexamination Certificate
active
07972746
ABSTRACT:
A fuel cell stack that includes a stack of fuel cells each having a cathode side bipolar plate including parallel cathode gas flow channels. Airflow from a cathode inlet manifold is directed to the flow channels to provide the cathode gas to the fuel cell membrane. The fuel cell stack includes a device positioned within the inlet manifold that selectively blocks a predetermined number of the flow channels for each cell at low load operation to increase the flow rate in the unblocked flow channels, so that the fuel cell stack generates the desired low load output, and the increased flow rate prevents water from accumulating in the unblocked flow channels.
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patent: 6893708 (2005-05-01), Shen et al.
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patent: 2003/0019363 (2003-01-01), Grover et al.
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patent: 2005/0145216 (2005-07-01), Yang et al.
Online translation of JP 2004-146242, Azuma Shugo, Fuel cell system, May 20, 2004.
GM Global Technology Operations LLC
Han Kwang
Miller John A.
Miller IP Group, PLC
Yuan Dah-Wei D
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