Patent ID: 7674550

Claim:
A fuel cell comprising: an electrolyte/electrode structure having an electrolyte being arranged between a pair of electrodes, and a plurality of metal separators being stacked on said electrolyte/electrode structure, each of said plurality of separators including reaction gas passages formed on one side thereof for feeding a reaction gas in the surface direction of said electrodes, said reaction gas passages being communicated with communication holes including at least a reaction gas introducing communication hole and a reaction gas discharging communication hole extending in the stacking direction, wherein said separators are integrated with seal members so as to cover at least surroundings of said electrodes and said communication holes; wherein one of said seal members includes a body base portion having a single trapezoidal-shaped cross-section and a plurality of protruded portions integrated with a leading end of said body base portion, said protruded portions including upper ends and a lower end where a height between the lower end and one of the upper ends is equal to a height between the lower end and another one of the upper ends, said trapezoidal-shaped cross-section of said body base portion rising to a height to contact the lower end of said pair of said protruded portions, said leading end of said trapezoidal-shaped cross-section of said body base portion integrating smoothly with one of said protruded portions; wherein said plurality of protruded portions form greater contact area between said one seal member and a sealing surface; and wherein said body base portion is connected to said plurality of protruded portions by a curved portion, the curved portion has a radius of curvature in a range of 0.3 mm to 1.0 mm to prevent stress concentration during sealing.