| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve a power generation characteristic by improving water draining capability without increasing the number of constituent components. <P>SOLUTION: A fuel cell stack composed by stacking a plurality of unit cells is provided with electrolyte films and first and second separators. Each unit cell is provided, in its inside, with: a fuel gas passage and an oxidizing gas passage; first and second cooling water passages formed on the back face of the fuel gas passage and on the back face of the oxidizing gas passage for cooling the electrolyte film and the like; fuel gas entrance and exit manifolds and oxidizing gas entrance and exit manifolds for feeding a fuel gas and an oxidizing gas to the fuel and oxidizing gas passages, respectively; and also cooling water entrance and exit manifolds. The fuel cell is characterized by setting cooling-water cooling capabilities on the exit sides of the fuel gas and oxidizing gas passages lower than those of the entrance sides thereof to raise the temperatures of the fuel gas and the oxidizing gas on the exit sides so that saturated steam amounts of the fuel gas and the oxidizing gas on the exit sides are increased. <P>COPYRIGHT: (C)2004,JPO |
