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 formed by apertures in the plate-shaped elements , the main directions 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 is associated with each of the flow channels , and that a pressure element cross-section projected along the cell axis of at least one of these pressure elements 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 formed by apertures in the plate-shaped elements , the main directions 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 is associated with each of the flow channels , and that a pressure element cross-section projected along the cell axis of at least one of these pressure elements is positioned so as to at least partially overlap a flow channel cross-section projected along the cell axis . <EOS>