FUEL CELL UNIT

The invention relates to a fuel cell unit as a fuel cell stack for the electrochemical generation of electrical energy, comprising stacked fuel cells, the fuel cells each comprising a proton exchange membrane, an anode, a cathode, a gas diffusion layer, a bipolar plate () with three separate channel structures () with channels for the separate passage of oxidising agents, fuel and cooling fluid. The channel structures () have an inlet region () and an outlet region () for the oxidising agents, the fuel and the cooling fluid, at least one feed channel () for feeding the oxidising agents as process fluid into the gas spaces for oxidising the fuel cells, at least one feed channel () for feeding fuel as process fluid into the gas spaces for fuel of the fuel cells, at least one supply channel () for the coolant as process fluid for supplying the coolant into a channel for coolant, a distribution structure () for directing and distributing the process fluids from the supply channels () into the channel structures () of the bipolar plates (), at least two supply channels () being formed side by side in the longitudinal direction () when the inlet region () is formed with an extent predominantly in the transverse direction () between a transverse side () of the fuel cell () and the channel structure (), or at least two feed channels () being formed side by side in the transverse direction () when the inlet region () is formed with an extent predominantly in the longitudinal direction () between a longitudinal side () of the fuel cell () and the channel structure ().