Abstract: The invention relates to a fuel cell or fuel cell module (12) consisting of a plurality of single cells (7), all of which have the same dimensions, i.e. in terms of the length, width and height. Said cells have an optimal constructions, as the supply lines are associated with and connected to a cooling and medium module (40). Said cooling and medium module (40) is only used to provide secondary functional chambers (41), (42) or functional planes and to form the stack. In addition, either the hydrogen electrode (5), (5?) or the oxygen electrode (6), (6?) of the neighbouring single cell (7) is situated on both sides of a respective cooling and medium module (40). This obviates the need for all types of bipolar plates, permitting for example thin metal sheets (90), (91) to be used. Said sheets have gas inlets (73) and gas outlets (74) for the oxygen feed (70) and the hydrogen feed (71), allowing the separate conduction of both the process gases and the coolant.