| 摘要 |
A small fuel cell capable of improving stability of power generation is provided. A heat insulating layer 40 is provided outside an oxidant-electrode-side package member 22. In a face 40A on an oxidant electrode 12 side of the heat insulating layer 40, temperature is increased by heat generation of the oxidant electrode 12. A face 40B on the opposite side of the face 40A is apart from the oxidant electrode 12 and the heat resistivity of the material is high, and accordingly the temperature thereof is lower than that of the face 40A on the oxidant electrode 12 side, and temperature difference is generated in the thickness direction of the heat insulating layer 40. Water generated in the oxidant electrode 12 is vaporized by heat generation of the oxidant electrode 12 and becomes water vapor. Heat is drawn as vaporization heat and thereby heat generation of a power generator 10 is suppressed. The generated water vapor is condensed by the temperature difference in the heat insulting layer 40. The water is vaporized again by heat generation of the power generator 10. Due to such a cycle, heat generation and moisture of the fuel cell 1A are appropriately controlled and stability of operation is improved. A water retaining layer is provided in a through hole 41, the water condensed in the heat insulating layer 40 is surely returned to the fuel cell 1A.
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