Solid-oxide stack structure with improved cooling

A solid oxide stack structure, comprising:

• an alternation, in a stacking direction, of electrochemical cells and interconnection plates, each of the electrochemical cells being formed by an electrolyte layer, an anode layer and a cathode layer, disposed on either side of the electrolyte layer, in the stacking direction,
• wherein each of the interconnection plates that is located between two of the electrochemical cells is in contact with the anode layer of one of the two electrochemical cells and with the cathode layer of the other of the two electrochemical cell,
• wherein at least one of the interconnection plates includes at least one internal circuit for circulating a fluid for regulating a temperature of the two electrochemical cells that are in contact with the at least one of the interconnection plates,
• wherein each of the interconnection plates includes an anode plate that is in contact with the anode layer of one of the electrochemical cells, a cathode plate that is in contact with the cathode layer of another one of the electrochemical cells, and a central plate located between the anode plate and the cathode plate,
• wherein the central plate of the interconnection plate includes the at least one internal circuit,
• wherein the central plate further includes anode ducts and cathode ducts for supplying the electrochemical cells with fluids,
• wherein the central plate is a one-piece plate, and
• wherein the anode ducts are formed hollow in a first face of said one-piece central plate, the cathode ducts are formed hollow in a second face of the one-piece central plate and the at least one internal circuit is formed hollow in either of the first face or the second face of the one-piece central plate.