Fuel cell system and stack thereof

A fuel cell system, comprising:

• a fuel supply unit;
• an oxidant supply unit;
• and
• a fuel cell stack fluidly connected to the fuel supply unit and fluidly connected to the oxidant supply unit,
• wherein the stack comprises a plurality of stacked unit cells,
• wherein each of the stacked unit cells comprises a membrane electrode assembly and a separator arranged on either side of the membrane electrode assembly;
• wherein end plates are provided on opposite sides of the stacked unit cells,
• wherein at least one of the end plates comprises an oxidant inlet in fluid communication with the oxidant supply unit,
• wherein the at least one of the end plates comprises an unreacted oxidant outlet configured to output unreacted oxidant from the unit cells,
• wherein the oxidant inlet and the unreacted oxidant outlet are in fluid communication with each other via an absorption member,
• wherein the at least one of the end plates forms a slot housing the absorption member by forming in the right angle to the stacking direction of the unit cells, and wherein the oxidant inlet and the unreacted oxidant outlet are in fluid communication with the slot, and
• wherein the absorption member in the slot protrudes at an inner side of the oxidant inlet or an inner side of the unreacted oxidant outlet, so that a first hole and a second hole are formed, and wherein the first hole and the second hole are smaller than the oxidant inlet and the unreacted oxidant outlet, respectively.