Patent ID: 7601453
Filing Date: 2009-10-13
Classification: H01M,Y02E

Abstract:
1. A fuel cell formed by stacking an electrolyte electrode assembly and separators alternately, said electrolyte electrode assembly including a pair of electrodes, and an electrolyte interposed between said electrodes, wherein said separator includes first and second plates which are stacked together; said first plate has a first protrusion section protruding toward one of said electrodes to form a first reactant gas flow field between the one of said electrodes and said first protrusion section for allowing a first reactant gas to flow through said first reactant gas flow field; said second plate has a second protrusion section protruding toward the other of said electrodes to form a second reactant gas flow field between the other of said electrodes and said second protrusion section for allowing a second reactant gas to flow through said second reactant gas flow field; and at least said first protrusion section includes a plurality of protrusions and a ring shaped protrusion, which is provided in the region of the first reactant gas flow field where the first reactant gas is immediately before being discharged from the first reactant gas flow field and which is provided around said plurality of protrusions, and is in surface to surface contact with the one of the electrodes.