Fuel cell stack structure

A fuel cell stack array comprising:

• a first fuel cell stack including:
• a first single cell stack structure, wherein the first single cell stack structure has a first topmost connector layer;
• a first upper frame structure disposed on a top of the first topmost connector layer and having a first through-hole defined therein;
• and
• a first lower frame structure disposed on a bottom of the first single cell stack structure;
• a second fuel cell stack including:
• a second single cell stack structure, wherein the second single cell stack structure has a second topmost connector layer;
• a second upper frame structure disposed on a top of the second topmost connector layer and having a second through-hole defined therein;
• and
• a second lower frame structure disposed on a bottom of the second single cell stack structure, wherein the second fuel cell stack is adjacent to the first fuel cell stack;
• and
• a first current collector including:
• a first contact inserted into the first through-hole and electrically connected to the first topmost connector layer;
• a second contact inserted into the second through-hole and electrically connected to the second topmost connector layer;
• and
• a connection portion disposed on tops of the first and second upper frame structures for electrically connecting the first and second contacts,
• wherein the first current collector electrically connects the first and second topmost connector layers, and
• wherein, through the first through-hole, at least 50% of a top surface of the first topmost connector layer is exposed and surface-contacts the first contact of the first current collector.