FUEL CELL STACK

The invention relates to a fuel cell stack () having at least one fuel cell () which has a membrane (CCM) for separating an anode side (A) of the fuel cell () from a cathode side (K) of the fuel cell (), an anode-side gas diffusion layer (GDLA), a cathode-side gas diffusion layer (GDLK) and a bipolar plate (BPP) for separating the fuel cell () from an adjacent fuel cell () or a housing. According to the invention, the membrane (CCM) protrudes beyond the anode-side gas diffusion layer (GDLA) and the cathode-side gas diffusion layer (GDLK) in an edge region (R) located outside an active area (AF) of the membrane (CCM), and the membrane (CCM) has a centering dam () in the edge region (R) of the anode side (A) or of the cathode side (K).