Fuel cell system

Fuel cell system, comprising a plurality of layers and a channel system, wherein each layer contains at least two fuel cells, wherein the channel system contains at least one supply unit that is attributed to each layer, wherein the supply unit is adapted to supply reactant media to the at least two fuel cells and to guide reactant media from an inlet to an outlet, wherein the at least two fuel cells are arranged in series along the at least one supply unit and wherein the supply units of the layers are connected in such manner that reactant media can flow in series from one layer to another and/or to the outlet.