Electrolysis device for producing gaseous hydrogen, comprising - at least one electrolytic cell extending along a cell axis, which is constructed from plate-shaped elements arranged in a row along the cell axis, - at least two flow channels (5a, 5b) formed by apertures in the plate-shaped elements, the main directions(6a, 6b) of which extend along the cell axis, - sealing means for ensuring the tightness of the electrolysis device, the sealing means comprising - a first abutment element and a second abutment element, which abutment elements are spaced apart from one another in the direction of the cell axis, - a first pressure plate and a second pressure plate, which are spaced apart from one another in the direction of the cell axis and are arranged between the first abutment element and the second abutment element, wherein the at least one electrolytic cell is arranged between the first pressure plate and the second pressure plate, - at least one retaining element, which is configured to retain the first abutment element and the second abutment element along the cell axis at a predetermined distance, - and at least one elastically deformable pressure element at least between a pair of an abutment element and a pressure plate that are closest to each other, characterized in that at least one elastically deformable pressure element (12a, 12b) is associated with each of the flow channels (5a, 5b), and that a pressure element cross-section projected along the cell axis of at least one of these pressure elements (12a, 12b) is positioned so as to at least partially overlap a flow channel cross-section projected along the cell axis. - at least one electrolytic cell extending along a cell axis, which is constructed from plate-shaped elements arranged in a row along the cell axis, - at least two flow channels (5a, 5b) formed by apertures in the plate-shaped elements, the main directions(6a, 6b) of which extend along the cell axis, - sealing means for ensuring the tightness of the electrolysis device, the sealing means comprising - a first abutment element and a second abutment element, which abutment elements are spaced apart from one another in the direction of the cell axis, - a first pressure plate and a second pressure plate, which are spaced apart from one another in the direction of the cell axis and are arranged between the first abutment element and the second abutment element, wherein the at least one electrolytic cell is arranged between the first pressure plate and the second pressure plate, - at least one retaining element, which is configured to retain the first abutment element and the second abutment element along the cell axis at a predetermined distance, - and at least one elastically deformable pressure element at least between a pair of an abutment element and a pressure plate that are closest to each other, - a first abutment element and a second abutment element, which abutment elements are spaced apart from one another in the direction of the cell axis, - a first pressure plate and a second pressure plate, which are spaced apart from one another in the direction of the cell axis and are arranged between the first abutment element and the second abutment element, wherein the at least one electrolytic cell is arranged between the first pressure plate and the second pressure plate, - at least one retaining element, which is configured to retain the first abutment element and the second abutment element along the cell axis at a predetermined distance, - and at least one elastically deformable pressure element at least between a pair of an abutment element and a pressure plate that are closest to each other, at least one elastically deformable pressure element (12a, 12b) is associated with each of the flow channels (5a, 5b), and that a pressure element cross-section projected along the cell axis of at least one of these pressure elements (12a, 12b) is positioned so as to at least partially overlap a flow channel cross-section projected along the cell axis.