Abstract: The present invention relates to a tempering device for tempering of a stacked energy storage device or energy converter comprising a plurality of cells and comprising a plurality of plate-shaped heat conduction elements arranged between the cells, the tempering of the cells being effected via the plate-shaped heat conduction elements by means of heat conduction, a plurality of tempering ribs arranged outside the cells for changing the flow direction of the tempering air stream, the tempering ribs being thermally coupled to the heat conduction elements, and the tempering of the plate-shaped tempering ribs being effected by exposure to a tempering air stream by means of convection and/or via further means by means of heat conduction, the means for influencing the tempering air flow and/or for guiding the tempering air, which are designed to change a flow direction and/or a flow velocity of the tempering air flow, the means being structurally designed and/or arranged in such a way that several of the temperi

Abstract: According to the invention, a device is provided for extending the service life of a high-temperature polymer electrolyte membrane fuel cell. This device includes an HT-PEM fuel cell with at least one cell. The cell is constructed according to the following sequence: a supply plate with an anode channel structure, an anode gas diffusion electrode, an electrolyte-containing polymer membrane, a cathode gas diffusion electrode, and a supply plate with a cathode channel structure. In addition, at least one acid-filled acid reservoir is provided, which is connected to a distributor channel extending in the supply plates approximately perpendicular to the channel structures, the distributor channel being connected to at least one of the gas diffusion electrodes and/or the polymer membrane of at least one of the cells of the fuel cell stack in such a way that acid can be supplied to at least one of the gas diffusion electrodes and/or the polymer membrane of at least one of the cells of the fuel cell stack.