NOVELTY - The unit battery (2) has a thin-plate-like electric-power-generation structure (3) clamped between pair of separators (4a,4b). The electric-power-generation structure is integrated when the electrolyte layer (14) joins both electrodes (10,11) by contact. The electrolyte layer contains proton conduction gel having dispersed phase consisting of phosphate molecular chain, and dispersion medium consisting of water.    USE - For fuel cells, such as polymer electrolyte fuel cells, used in motor vehicles and mobile telephones.    ADVANTAGE - The unit battery has excellent proton conductivity, economical efficiency, and electric-power-generation efficiency. The electric-power-generation structure is not deformed or damaged during manufacture. By prescribing the interval of electrodes, the dimension difference of electrolyte layer formed between electrodes is reduced. The unit battery prevents short circuits, and provides high-quality fuel cells. The mass-production property of the unit battery is improved.    DETAILED DESCRIPTION - The unit battery (2) has a thin-plate-like electric-power-generation structure (3) formed by opposingly joining electrodes (10,11) consisting of a gaseous-diffusion conductive layer and a catalyst layer provided on both surfaces of an electrolyte layer (14), with the catalyst layer turned inside. A flat annular space (5) surrounds the circumference of the electric-power-generation structure clamped between a pair of separators (4a,4b). The electrolyte layer contains a proton conduction gel having a dispersed phase consisting of a phosphate molecular chain, and a dispersion medium consisting of water. The proton conductor is cured when a phosphate hydrate crystal precipitates. A support convex portion (31) is arranged around the internal circumference edge of the annular space. The electrode pair is arranged at the front and back of the support convex portion. When the proton of high-viscosity state precipitates between both electrodes and a phosphate hydrate crystal precipitates in the proton conductor, a thick-wall electrolyte layer is cured corresponding to the thickness of the support convex portion. The electric-power-generation structure is integrated when the electrolyte layer joins both electrodes by contact. The phosphate molecular chain contains calcium ion (Ca2+). An INDEPENDENT CLAIM is included for manufacture of unit battery.    DESCRIPTION OF DRAWING(S) - The figure shows the central vertical side view of the unit battery.    unit battery (2)    electric-power-generation structure (3)    separators (4a,4b)    annular space (5)    electrodes (10,11)    electrolyte layer (14)    support convex portion (31)