NOVELTY - Fuel cell device (3) includes two-sided flow boards (32), each has a non-conductive substrate including flow channel(s) disposed corresponding to membrane electrode assemblies. Conductive sheet(s) is made of a conductive material and covers the flow channels of the substrate. The conductive sheets are fixed to the substrate. Current collection sheet(s) is made of a conductive material, and respectively covers the conductive sheets. The current collection sheets are fixed to the conductive sheets.    USE - For use as a power generator for converting chemical energy stored within fuels and oxidants into electric energy.    ADVANTAGE - The fuel cell device has small and light fuel cell, and the flow board collects current well. It uses a two-sided flow board with a geometric structure, so the entire volume and weight of fuel cell are reduced, which benefits the integration of fuel cells with portable consumer electronic products. Because the two-sided flow board for the fuel cell device is rigid, the thickness of current collection sheets can be minimized, thus decreasing the volume and weight of the fuel cell. The two-sided flow board effectively prevents fuels (e.g., methanol) or products produced during electrochemical reactions from damaging the surfaces of the current collection sheets thus replacement rate for fuel cells is lowered.    DETAILED DESCRIPTION - Fuel cell device comprises at least one membrane electrode assembly disposed between two-sided flow boards. Each membrane electrode assembly comprises an anode electrode (300), a proton exchange membrane (302) and a cathode electrode (304). Each of two-sided flow boards comprises a non-conductive substrate, which includes flow channel(s). The flow channels are disposed corresponding to the membrane electrode assemblies. Conductive sheet(s) is made of a conductive material. The conductive sheets cover the flow channels of the substrate, and the conductive sheets are fixed to the substrate. Current collection sheet(s) is made of a conductive material, and respectively cover the conductive sheets. The current collection sheets are fixed to the conductive sheets.    DESCRIPTION OF DRAWING(S) - The figure is a perspective and associated diagram showing the fuel cell device.    Fuel cell device (3)    Two-sided flow boards (32)    Anode electrode (300)    Proton exchange membrane (302)    Cathode electrode (304)