Patent ID: 7378169

Claim:
A polymer electrolyte fuel cell comprising: a cell stack in which unit cells each comprising a polymer electrolyte membrane and an anode and a cathode sandwiching said electrolyte membrane are stacked with conductive separator plates; a pair of current collector plates and a pair of end plates, both of which sandwich said cell stack; and supply and discharge manifolds for a fuel gas and an oxidant gas, through which the fuel gas and the oxidant gas are supplied and discharged to and from the anode and the cathode of the cell stack, respectively; wherein the conductive separator plates directly contacting said current collector plates have a mist discharge groove in fluid communication with said supply and discharge manifolds for the fuel gas or oxidant gas in their surfaces directly contacting said current collector plates, and wherein said mist discharge groove discharges condensation-induced mist to the outside of the fuel cell.