Solid oxide fuel cell

A solid oxide fuel cell comprising:

• a plurality of laminated power generation cells each including a solid electrolyte layer, an anode electrode disposed on one surface of the solid electrolyte layer, a cathode electrode disposed on the other surface of the solid electrolyte layer, and a porous metal support layer disposed on both an anode electrode side and a cathode electrode side and supporting the electrodes;
• a separator provided between the power generation cells and separated from the porous metal support layer;
• and
• an interconnector located between the separator and the porous metal support layer, wherein:
• an anode flow path for supplying a fuel to the anode electrode is formed between the anode electrode side of the power generation cell and the separator, and a cathode flow path for supplying air to the cathode electrode is formed between the cathode electrode side of the power generation cell and the separator,
• the interconnector includes an anode-side interconnector including a first joining portion joined to the separator and a second joining portion joined to the porous metal support layer on the anode electrode side, and a cathode-side interconnector including a third joining portion joined to the separator and a fourth joining portion joined to the porous metal support layer on the cathode electrode side,
• the anode-side interconnector is welded to the separator at the first joining portion and welded to the porous metal support layer on the anode electrode side at the second joining portion, and
• the cathode-side interconnector is joined to the separator at the third joining portion by a joining method other than welding, and is welded to the porous metal support layer on the cathode electrode side at the fourth joining portion.

A solid oxide fuel cell comprising:

• a plurality of laminated power generation cells each including a solid electrolyte layer, an anode electrode disposed on one surface of the solid electrolyte layer, a cathode electrode disposed on the other surface of the solid electrolyte layer, and a porous metal support layer disposed on at least one of an anode electrode side or a cathode electrode side and supporting the electrodes;
• a separator provided between the power generation cells and separated from the porous metal support layer;
• and
• an interconnector located between the separator and the porous metal support layer, wherein:
• an anode flow path for supplying a fuel to the anode electrode is formed between the anode electrode side of the power generation cell and the separator, and a cathode flow path for supplying air to the cathode electrode is formed between the cathode electrode side of the power generation cell and the separator,
• the interconnector includes a portion joined to the separator and a portion joined to the porous metal support layer, and is welded to the porous metal support layer at the portion joined to the porous metal support layer, and
• a thickness of the separator is equal to or less than a thickness of the interconnector.