Cell stack, method of producing a cell stack and fuel cell or electrolysis cell including a cell stack

A method of producing a cell stack comprising a plurality of single cells, wherein each single cell comprises a membrane electrode assembly having a cathode, an anode, and an interposed membrane, as well as either an anode gas diffusion layer arranged on an exposed side of the anode having a first thickness gradient in a transverse machine direction or a sintered titanium component, and a cathode gas diffusion layer arranged on an exposed side of the cathode having a second thickness gradient in the transverse machine direction, wherein

• a) in a single cell, the anode gas diffusion layer and the cathode gas diffusion layer are arranged in relation to one another such that the first thickness gradient of the anode gas diffusion layer and the second thickness gradient of the cathode gas diffusion layer run opposite to one another or
• b) in two or more single cells, anode gas diffusion layers of the two or more cells are arranged in relation to one another such that an overall thickness gradient of these anode gas diffusion layers is minimized and/or wherein in two or more single cells cathode gas diffusion layers of the two or more cells are arranged in relation to one another such that an overall thickness gradient of these cathode gas diffusion layers is minimized.