NOVELTY - A solar battery module for optical electrolysis comprises hydrogen ion-conducting polymer electrolyte as partition member and photocells with serially connected spherical solar battery elements in matrix form to provide full contact with electrolytic solution.    USE - The battery modules can be used to electrolyze water and carbon dioxide gas in electrolytic solution with irradiation from the sunlight to generate hydrogen oxygen methane gas and other reduction products.    ADVANTAGE - Such battery modules are simple construction, practicability, fast electrolysis, reduced overpotential, and enhanced removal of reaction products.    DETAILED DESCRIPTION - A solar battery module for optical electrolysis comprises photocell arrays composed of a plurality of serially connected spherical solar battery elements in a transparent housing member, both ends of which are equipped with a pair of electrodes for electrolysis and are exposed to provide close contact with the solutions in the respective chambers. The battery elements are each made of p- and n-type semiconductor crystals with photovoltaic power generating part containing the p-n connection formed at the surface of the spherical crystals, particularly in the middle part so that the power can be supplied to the electrodes. The electrolytic solution is in a liquid state suitable for electrolysis by the photovoltaic power generated by the sunlight. An INDEPENDENT CLAIM is also included for an optical electrolysis device in which the sunlight can easily get to the container interior where the electrolytic solution sits and photovoltaic power can be generated after receiving the light by the plurality of solar batter modules, with the anode- and cathode-containing modules mounted on the partition member and interlinked, and products obtained from both electrodes separable in the two chambers.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal cross-section of an optical electrolysis device.    Glass container (31)    reduction chamber (32)    oxidation chamber (33)    partition member (34)    solar battery module (35)    anode (46)    cathode (48)