Patent ID: 7378167

Claim:
The fuel cell comprising: at least one unit cell including a first separator which is disposed on one side of a membrane-electrode assembly, and which includes a first concave groove which constitutes a first gas passage, and a first convex rib whose rear surface constitutes a first refrigerant passage, and on which a first gas cross groove is formed; and a second separator which is disposed on the other side of the membrane-electrode assembly, and which includes a second concave groove which constitutes a second gas passage, and a second convex rib whose rear surface constitutes a second refrigerant passage, and on which a second gas cross groove is formed, and wherein an integral refrigerant passage whose cross sectional area in a direction in which the integral refrigerant passage extends is equal to or larger than that of the first refrigerant passage and that of the second refrigerant passage is formed by combining the first refrigerant passage and the second refrigerant passage in a cell stacked direction when a plurality of the first separators and a plurality of the second separators are stacked, wherein the first concave groove and the first convex rib are provided in plurality, and are positioned in parallel with each other in a direction in which the first concave groove and the first convex rib extend, and the first gas cross groove is formed in a direction perpendicular to the direction in which the first convex rib extends, and cross-links at least two of the first concave grooves; and the second concave groove and the second convex rib are provided in plurality, and are positioned in parallel with each other in a direction in which the second concave groove and the second convex rib extend, and the second gas cross groove is formed in a direction perpendicular to the direction in which the second convex rib extends, and cross-links at least two of the second concave grooves.