Flow field unit for a fuel cell stack
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United States of America Patent
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Oct 23, 2012
Grant Date -
Nov 11, 2010
app pub date -
May 13, 2008
filing date -
Jun 11, 2007
priority date (Note) -
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Abstract
The invention relates to a repeating unit for a fuel cell stack comprising a membrane electrode assembly and a flow field designed to supply an active surface of the membrane electrode assembly with gas and comprising at least a gas passage orifice. According to the invention it is contemplated that a gas-tight gas flow barrier is disposed between the active surface and the gas passage orifice so that gas passing through the first gas passage orifice flows around the gas flow barrier, wherein the projection of the gas flow barrier towards the periphery of the active surface is at least half as long as the projection of the gas passage orifice towards the periphery of the active surface.
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