PEM-type fuel cell assembly having multiple parallel fuel cell sub-stacks employing shared fluid plate assemblies and shared membrane electrode assemblies
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United States of America Patent
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Aug 31, 1999
Grant Date -
N/A
app pub date -
Apr 3, 1998
filing date -
Apr 3, 1998
priority date (Note) -
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Abstract
A Proton Exchange Membrane (PEM) fuel cell stack is disclosed having multiple layers between a first end plate and a second end plate. The multiple layers define multiple fuel cell sub-stacks disposed in parallel and electrically isolated from each other intermediate the end plates. At the end plates, the fuel cell sub-stacks are electrically connected in series. At least some layers of the fuel cell stack comprise shared layers shared between multiple sub-stacks, and at least some layers of the multiple layers comprise dedicated layers for corresponding fuel cell sub-stacks. The shared layers include a fluid flow plate assembly and a membrane electrode assembly, while the dedicated layers comprise gas diffusion layers. The fluid flow plate assembly is fabricated of a non-conductive material and has multiple conductive fluid flow sub-plates, each of which aligns to a respective sub-stack of the fuel cell stack.
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