Fuel cell stack

A fuel cell stack comprising:

• a plurality of power generation devices each comprising:
• n membrane electrode assemblies each including electrodes and an electrolyte that is sandwiched between the electrodes, n being an even number;
• (n+1) corrugated separators that are alternately stacked together with the membrane electrode assemblies, the corrugated separators sandwiching both sides of the membrane electrode assemblies with third protrusions of the corrugated separators in a stacking direction;
• and
• a reactant gas channel that allows a reactant gas to flow along an electrode surface in a plane direction of the corrugated separators, the reactant gas being one of a fuel gas and an oxidant gas;
• and
• a coolant channel provided between the power generation devices,
• wherein a first-end corrugated separator among the corrugated separators has a first protrusion that protrudes between recesses of the coolant channel in a direction away from one of adjacent membrane electrode assemblies of the membrane electrode assemblies, the first-end corrugated separator being disposed at a first end of each of the power generation devices in the stacking direction,
• wherein a second-end corrugated separator among the corrugated separators has a second protrusion that protrudes between recesses of the coolant channel in a direction away from another of the adjacent membrane electrode assemblies, the second-end corrugated separator being disposed at a second end of each of the power generation devices in the stacking direction, and
• wherein the first protrusion and the second protrusion are disposed so as to be superposed with each other in the stacking direction.