Metallic bipolar plate for fuel cells,and fuel cell comprising the same
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United States of America Patent
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Issued Date -
Feb 14, 2008
app pub date -
Aug 6, 2007
filing date -
Aug 9, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The present invention relates to a metallic bipolar plate for fuel cells, including: a plate-like metallic substrate containing a metal capable of being passivated; and a noble-metal layer disposed partially on both surfaces of the metallic substrate to coat the metallic substrate, the metallic bipolar plate having a concave-convex portion formed at least in a region facing an electrode of a membrane electrode assembly, in which both surfaces of the metallic bipolar plate respectively have a contact surface which contacts with the electrode and a non-contact surface which does not contact with the electrode, and in which both surfaces of the metallic bipolar plate respectively have a coating area ratio of the noble-metal layer to the contact surface within a range of from 20% to 100%, and a coating area ratio of the noble-metal layer to the non-contact surface within a range of from 5% or more but less than 100%.
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