Stack for a solid oxide fuel cell using a flat tubular structure

A method for manufacturing a solid oxide fuel cell stack that generates electricity by an electrochemical oxidation reaction by supplying fuel gas and air thereto, the method comprising the steps of:

• grooving the central portions of the outer surfaces of a porous flat tubular structure including a plurality of internal channels for a first gas flow, excluding both side edges of the outer surfaces, to a predetermined depth, thereby manufacturing a support that provides external channels for a second gas flow when a plurality of the supports are stacked on each other;
• forming a plurality of unit cells including a first gas electrode layer, an electrolyte layer, and a second gas electrode layer on the surfaces of the central portions of the support, on which the second gas channels were formed, the unit cells being spaced apart from each other at a predetermined interval in a lengthwise direction, and then connecting the different poles of the unit cells to each other by an electrical interconnector, and connecting the first gas electrode layer and the second gas electrode layer, exposed at both opposite ends, to electrical interconnectors which coat both ends of the support and the side edges of the outer surfaces of the support, thereby manufacturing a unit cell module;
• and
• stacking the unit cell modules vertically or vertically and horizontally to manufacture a unit stack module, and stacking the unit stack modules, thereby manufacturing a two-dimensional or three-dimensional stack.

A solid oxide fuel cell stack in which unit cell modules are stacked, the unit cell module comprising:

• a flat tubular support having internal channels and grooves formed at the central portions of the outer surfaces of the support, wherein the internal channels serve as first gas channels and the grooves serve as second gas channels;
• at least one unit cell formed on the second gas channel and consisting of a first electrode layer, an electrolyte layer and a second electrode layer;
• a first electrical interconnector formed on the front end of the support and on one side edge of the outer surfaces so as to be connected to the first electrode;
• and
• a second electrical interconnector formed on the rear end of the support and on the other side edge of the outer surfaces so as to be connected to the second electrode.