| 摘要 |
PURPOSE:To improve battery characteristics by providing a gas separating means selectively separating oxygen from the oxidizer gas fed by a gas feeding means feeding the oxidizer gas to the air electrode of the unit cell of a fuel cell main body, and feeding the high-concentration oxygen gas separated by the gas separating means to the air electrode. CONSTITUTION:Flow adjusting means 4, 6 are opened and cutoff valves 10, 11, 15 are closed during the power generation of a fuel cell. The air boosted by an air blower 3 passes through a gas separating means 14 and is fed to an air electrode 1 as high-concentration oxygen gas. The air gas separated by the gas separating means 14 is fed to a nitrogen feeding line 17 and discharged to the atmosphere by a flow adjusting means 17a. The flow adjusting means 4, 6 are closed and the cutoff valves 10, 11 are opened during the period other than the power generation of the fuel cell, the nitrogen extracted by the gas separating means 14 from the air boosted by the air blower 3 is fed to both electrodes 1, 2 through the cutoff valves 10, 11, and the high- concentration oxygen gas is discharged to the atmosphere through the cutoff valve 15 on the other hand. The oxygen concentration in the oxidizer gas is increased, and battery characteristics can be improved. |
