Patent ID: 8025920

Claim:
A method of manufacturing a bipolar unit for fuel cells, the bipolar unit comprising a first metal plate and a second metal plate, each of the first metal plate and the second metal plate provided with an external surface and an internal surface, connections between said respective internal surfaces, openings for the transmission of gaseous reactants and a coolant, at least said first metal plate being provided with corrugations forming a first channel comprised between said internal surfaces directed to ensure the passage of the coolant, wherein the external surface of said first metal plate is in uniform electrical contact with a first facing conductive and porous current collector and the external surface of said second metal plate is in uniform electrical contact with a second facing conductive and porous current collector, wherein said uniform electrical contact between the external surface of said first metal plate and said first facing porous current collector is given by the interpenetration between said corrugations and said first facing porous current collector, the method comprising formation of said corrugations by pressure molding of a planar sheet.