Fuel cell stack and method of producing dummy cell

A method of producing a dummy cell provided at least at one end of a stack body of a fuel cell stack in a stacking direction,

• the fuel cell stack comprising:
• the stack body comprising a plurality of power generation cells stacked together in the stacking direction, the power generation cells each including a membrane electrode assembly, a resin frame member provided around the membrane electrode assembly, and separators sandwiching the membrane electrode assembly, the membrane electrode assembly including an electrolyte membrane and electrodes provided on both sides of the electrolyte membrane, the electrodes each having a gas diffusion layer of electrically conductive porous body,
• the method comprising:
• a first stacking step of stacking a first electrically conductive porous body, a second electrically conductive porous body, and a third electrically conductive porous body each having a difference surface size, in a stacking direction in a manner that a first adhesive layer is interposed between the first electrically conductive porous body and the second electrically conductive porous body and a second adhesive layer is interposed between the second electrically conductive porous body and the third electrically conductive porous body;
• a hardening step of hardening the first adhesive layer and the second adhesive layer to form a first joint layer for joining the first electrically conductive porous body and the second electrically conductive porous body and form a second joint layer for joining the second electrically conductive porous body and the third electrically conductive porous body, and thereby obtaining a dummy assembly corresponding to the membrane electrode assembly;
• a resin frame joining step of providing a dummy resin frame member on the dummy assembly and around the dummy assembly to thereby obtain a resin frame equipped dummy assembly;
• and
• a second stacking step of sandwiching the resin frame equipped dummy assembly between dummy separators to thereby obtain the dummy cell,
• wherein the first adhesive layer and the second adhesive layer are provided at different positions in the stacking direction in the first stacking step, to thereby form the first joint layer and the second joint layer at different positions in the stacking direction in the hardening step.