An energy store has a plurality of electric energy storage cells, which are connected electrically in series or in parallel and are combined to form an energy storage module. Interspaces are formed between the energy storage cells and into which coolants or refrigerants can be introduced. In each case, side surfaces of the energy storage cells that bound the interspaces are provided with a regular pattern, which is formed in the shape of an elevation or depression with respect to the remaining surface of the relevant side surface.