Stack for fuel cell system

A stack for a fuel cell system, comprising:

• a membrane electrode assembly that includes an anode electrode and a cathode electrode disposed on respective sides of a polymer electrolyte membrane;
• a separator that includes a fuel passage that supplies a fuel to the anode electrode disposed on one side of the membrane electrode assembly in a stacking direction, or an oxidant passage that supplies an oxidant to the cathode electrode disposed on the other side of the membrane electrode assembly in the stacking direction;
• and
• end plates disposed at respective ends of the stack in the stacking direction,
• wherein the separator includes:
• a first manifold formed by connecting first penetration holes that penetrate the separator in the stacking direction and that is connected to the fuel passage;
• a second manifold formed by connecting second penetration holes that penetrate the separator in the stacking direction and that is connected to the oxidant passage;
• and
• a baffle that is disposed in at least one of the first manifold and the second manifold, the baffle having a membrane structure and extending to the inside of the at least one of the first manifold and the second manifold,
• wherein:
• the at least one of the first manifold and the second manifold forms a quadrangle-shaped space in a plane perpendicular to the stacking direction,
• the baffle includes a first baffle portion, a second baffle portion, a third baffle portion and a fourth baffle portion that each have a triangle shape, each triangle shape corresponding to a quarter of the quadrangle-shaped space, each of the first, second, third and fourth baffle portions being attached to the separator at a respective side of the quadrangle-shaped space, and
• a combined area of the first, second, third and fourth baffle portions that extends into the at least one of the first manifold and the second manifold is the same as the area of the quadrangle-shaped space.