Abstract: An electrochemistry device, in particular an electrolysis device, in particular a polymer electrolyte membrane electrolysis device, has at least one cell unit, which includes at least one first electrochemical cell and at least one second electrochemical cell, and has at least one fluid supply unit for supplying the cell unit with at least one fluid, in particular with water, which at least one fluid supply unit includes at least one first fluid supply path extending at least section-wise through the first electrochemical cell, and at least one second fluid supply path extending at least section-wise through the second electrochemical cell, the fluid supply unit is designed in such a way that, in at least one normal operating state, a volume flow of the fluid through the first electrochemical cell and through the second electrochemical cell is at least substantially identical.

Abstract: A method for operating an electrolysis device (2) for producing hydrogen uses a water circuit. Water from a polymer electrolyte membrane (PEM) electrolyzer (6) is cooled in a cooling device (10) and subsequently led to an ion exchanger (4) for processing the water. The water, after the processing in the ion exchanger (4), is fed to the PEM electrolyzer (6). Heat is removed from the water before feeding the water to the cooling device (10). A part of this removed heat is fed again to the water after the processing in the ion exchanger (4) and before entry into the PEM electrolyzer (6).

Abstract: A method is provided for running up/starting up an electrolysis device (10), which device includes a reactor container (3) which is arranged downstream of an electrolyzer (1) and in which oxygen reacts with hydrogen into water, in order to reduce an oxygen share in a hydrogen gas flow coming from the electrolyzer (1). The electrolysis device (10) is operated with a predefined operating pressure. Upon running up/starting up the electrolyzer (1), the hydrogen gas flow coming from the electrolyzer (1) is led past the reactor container (3) via a bypass conduit (11).

Abstract: An electrolysis device (7) includes a water circuit (6), in which an electrolyzer (5), a collection container (1) and at least one pump (2) are arranged. The water is pumped by way of the at least one pump (2) out of the collection container (1) to the electrolyzer (5). The water circuit (6) is branched into at least one first branch (8) and into a second branch (9) which is parallel to the first branch (8). The electrolyzer (5) is arranged in the first branch (8) and a heat exchanger (3), for cooling the water, is arranged in the second branch (9).

Abstract: An electrolyzer (2) includes at least one electrolysis cell (4), arranged between two end plates (6.8), in a polymer electrolyte membrane construction manner, and a pressing device for producing a pressing force between the end plates (6.8). The pressing force at least partly is controlled in a manner dependent on the gas pressure produced by the electrolysis cell (4).

Abstract: A method is provided for running up/starting up an electrolysis device (10), which device includes a reactor container (3) which is arranged downstream of an electrolyzer (1) and in which oxygen reacts with hydrogen into water, in order to reduce an oxygen share in a hydrogen gas flow coming from the electrolyzer (1). The electrolysis device (10) is operated with a predefined operating pressure. Upon running up/starting up the electrolyzer (1), the hydrogen gas flow coming from the electrolyzer (1) is led past the reactor container (3) via a bypass conduit (11).