A method for controlling the temperature of fuel cell or Elektrolyseurstacks

The invention inter alia relates to a method for controlling the temperature of fuel cell or Elektrolyseurstacks (10) arranged in each of a plurality of bipolar plates in the stack (15) are made. In this case, (, 14a 14b) between two respective adjacent bipolar plates (15) is provided an electrolyte membrane (14), the both sides with a gas diffusion layer is coated, and each bipolar plate (15) consists of an anodic Bipolarhalbplatte (16) and a cathodic Bipolarhalbplatte (17 ) which are electrically conductively connected to one another and between which cooling channels (18) are provided. In each fuel cell or Elektrolyseurstack (10) arranged cooling channels (18) each layer of bipolar plates (15) in the stacking direction line by line, opposite to the cooling channels (18) of adjacent layers of bipolar plates (15), transversely (c) for Hauptdurchstromrichtung operating media which is discharged also transversely to Hauptdurchstromrichtung c of the working media to be acted upon by a heating medium. In this case, the temperature control medium flows through each bipolar plate (15) transversely and / or longitudinally and / or at any angle according to the geometry resulting from the shape of the anode channels (19) and cathode channels (20) resulting cooling channels (18).