Fuel cell assembly

The structure has cells formed of two electrodes, and two interface units, each with a distributor unit (100), made of thermoplastic material. The unit has, on its side opposite to an electrode, distribution channels (111) for diffusion of reactant, and a collector unit (200) made of conductive unit. The unit (200) has perforations (211) to enable diffusion of the reactant between the channels and the electrode facing the unit (100).