PURPOSE: To prevent deterioration of a sealant caused by contact with concentrated phosphoric acid by forming a concavity acting as a reservoir in the lower part, where a supporting plate of a fuel cell stack is fit to a container through the sealant, of a reacting gas supply and exhaust container.
CONSTITUTION: Interconnectors 2 are placed on both sides of a unit cell 1 and they are stacked and fixed with supporting plates 5 from the upper and lower directions. A reacting gas supply and exhaust container 7 is fit to the supporting plates 5 through a sealant 6 such as fluorine rubber to form a fuel cell. A reacting gas supply and exhaust container 11 having a concavity 12 acting as a reservoir in the upper part of the place where is in contact with the sealant 6 in the inner lower part of the container is used instead of the reacting gas supply and exhaust container 7. Condensed water inside the container 11 is stored in the concavity 12. Thereby, deterioration of the sealant 6 caused by contact of phosphoric acid contained in the condensed water with the sealant 6 is prevented.
NARA HIDEYUKI
KOYAMA AKIO
