NOVELTY - The method involves partially producing a periphery (2) by mounting multiple periphery devices (13). Fuel cell elements (5) are individually attached at the periphery for mounting a fuel cell (3). A tightness test of the fuels cell provided in a structure or the fuel cell elements is implemented after attaching each element. The elements are provided with anode and cathode gas openings (9, 10) that are aligned to each other in a mounted condition and form an anode gas channel (11) and a cathode gas channel (12). The anode and/or cathode gas channels are sealed by a sealing device (26).    USE - Method for manufacturing a fuel cell module that is utilized as an additional energy source in a vehicle for supplying electrical energy.    ADVANTAGE - The method implements the tightness test of the fuels cell provided in a structure or the fuel cell elements after attaching each individual fuel cell element, so that the quality of the connection between the attached fuel cell element and the periphery is tested, thus enabling better accessing of the connecting areas from outside by the actual fuel cell element to be attached for suitable joining process e.g. laser welding process, and ensuring completion of the fuel cell module after attaching and/or mounting the fuel cell. The method hence eliminates the need for attaching additional periphery devices for joining process required during attaching and/or mounting of the periphery devices, so that the damages to the sensitive areas of the fuel cell elements due to strong vibrations are avoided, thus simply implementing the manufacture of the module with high quality and at low cost.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic sectional view of a fuel cell module in an area of a fuel cell.    Periphery (2)    Fuel cell (3)    Fuel cell elements (5)    Anode gas opening (9)    Cathode gas opening (10)    Anode gas channel (11)    Cathode g channel (12)    Periphery devices (13)    Sealing device (26)