Patent ID: 7462415

Claim:
A device comprising an electrochemical cell, said electrochemical cell comprising: a membrane electrode assembly defining an anode side of said cell and a cathode side of said cell; a first flow field plate for the cathode side of said cell, said first flow field plate comprising a plurality of first channels separated by first lands, wherein said plurality of first channels and first lands run between a first set of fluid manifolds; and a second flow field plate for the anode side of said cell, said second flow field plate comprising a plurality of second channels separated by second lands, wherein said plurality of second channels and second lands run between a second set of fluid manifolds, wherein said membrane electrode assembly is interposed between said first and second flow field plates, a pitch defined by said first flow field plate is less than a pitch defined by said second flow field plate, an adjacent pair of said first lands and an associated one of said second lands are each provided in a pattern of alternating angles and crests in a plane parallel to both of said flow field plates, said pattern of said adjacent pair of first lands and said pattern of said associated one of said second lands are orientated relative to each other across the membrane electrode assembly such that said adjacent pair of said first lands and said associated one of said second lands crisscross along said alternating angles and alternate crests of said adjacent pair of said first lands aligning in cross section with a crest of said associated one of said second lands and then a crest of one of said adjacent pair of said first lands aligning in cross section with one of said plurality of second channels, and said pitch of each said first and second flow field plates is constant between said first and second sets of fluid manifolds.