Assembly method and arrangement for a cell system

An assembly arrangement of solid oxide cells for a fuel cell system or for an electrolyzer cell system, the assembly arrangement comprising:

• a plurality of cell stack formations, each cell stack formation having four sides;
• a plain attachment side formed as at least one of the four sides of each cell stack formation, said plain attachment side is defined by a horizontal plane, wherein the plain attachment side includes at least one geometrically deviating attachment surface structure, the at least one geometrically deviating attachment surface structure having a length that fully extends across the plain attachment side in one direction of the horizontal plane;
• at least one flow restriction structure configured for restricting air flows in a cell system, wherein the at least one flow restriction structure includes a first flow restriction structure that connects adjacent first and second cell stack formations of the plurality of cell stack formations, wherein the first flow restriction structure is mounted to a first geometrically deviating attachment surface structure of the first cell stack formation and is mounted to a first geometrically deviating attachment surface structure of the second cell stack formation, wherein the at least one flow restriction structure includes a second flow restriction structure that connects at least one of the first and second cell stack formations to an adjacent third cell stack formation of the plurality of cell stack formations, wherein the second flow restriction structure includes a first member mounted to a second geometrically deviating attachment surface structure of the at least one first and second cell stack formation and a second member that is attached to a third flow restriction structure of the third cell stack formation;
• and
• an electrical insulation to insulate each flow restriction structure and the cell stack formation.