SOLID ELECTROLYTE FUEL CELL

PROBLEM TO BE SOLVED: To control the temperature of current collecting members, to reduce the thermal stress due to the difference of the thermal expansion coefficient between unit cells and the current collecting members and to prevent the breakage and peeling of the current collecting members by making the current collecting members hollow, and feeding a heat medium in hollow sections. SOLUTION: Unit cells 1 aligned in the same direction are connected together vertically and horizontally via conductive felts 2, the unit cells 1 on the uppermost stage and lowermost stage are connected to current collecting members 4a, 4b via the conductive felts 2 respectively, and electric power is taken out from the opposite current collecting members 4a, 4b. Hollow sections 7 are provided on the current collecting members 4a, 4b respectively, a heat medium is fed to the hollow sections 7 to control the temperature of the current collecting members 4a, 4b, the displacement quantities by heat of junctions between the unit cells 1 and the current collecting members 4a, 4b are made equal, the thermal stress by the difference of the linear expansion coefficient is reduced, and the occurrence of troubles such as the breakage of the unit cells 1 and the current collecting members 4 or the peeling of the junctions can be prevented. When temperature is lowered, the specific resistance of the current collecting members 4 is reduced, and power generation efficiency can be improved.