Method and apparatus for distributing water to an ion-exchange membrane in a fuel cell
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United States of America Patent
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Aug 10, 1999
Grant Date -
N/A
app pub date -
Dec 1, 1997
filing date -
Dec 1, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus are provided for distributing water produced by the electrochemical reaction to an ion-exchange membrane in a electrochemical fuel cell. Water distribution within a fuel cell is improved to reduce membrane dryness near the oxidant stream inlet and to also reduce saturation of the oxidant stream near the oxidant stream outlet, thereby reducing electrode flooding. The method comprises periodically reversing the flow direction of an oxidant stream through a fuel cell flow field. The apparatus comprises an oxidant stream flow switching device for periodically switching the flow direction of an oxidant stream through a fuel cell flow field. In one embodiment the apparatus further comprises a water recycler for capturing water from the oxidant exhaust stream and returning the captured water to the oxidant supply stream when the flow direction is reversed.
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