本发明提供一种结构及控制方法简单,且具备无须变更运转条件便可判定燃料电池之加湿状态的加湿状熊判定机构的燃料电池系统。本发明之燃料电池系统S由燃料电池25及电源系统控制设备50构成,上述燃料电池25系使自储氢槽32所输送之氢气与自鼓风机37所输送之空气中的氧气反应而产生电力,上述电源系统控制设备50系根据鼓风机37之耗电与设置临限値之差而判定燃料电池25之加湿状态。本发明将供给至燃料电池25之空气压力设置为高于自燃料电池25排出之空气压力且近似于该压力的压力。当燃料电池25加湿过剩时,借由调整水箱27之冷却能力,使燃料电池25之温度上升。使鼓风机37之耗电与临限値之差越大,则水箱27之冷却水温度越更加上升。

To provide a fuel cell system which is simple in structure and easy to control, and which is provided with a humidification state determination means which can determine the humidification state of a fuel cell without changing an operating condition. A fuel cell system S is constituted of a fuel cell 25 which generates electric power through a reaction between hydrogen gas fed from a hydrogen tank 32 and oxygen gas in air fed from an air blolwer 37; and a power source system control device 50 for determining the humidification state in the fuel cell 25 based on the difference between the power consumption of the air blower 37 and a preset threshold value. The pressure of air to be supplied to the fuel cell 25 is set to a pressure which is greater than the pressure of air to be discharged from the fuel cell 25 and close to the pressure. When the fuel cell 25 is excessively humidified, the temperature of the fuel cell 25 is increased by adjusting the cooling capacity of a radiator 27. As the difference between the power consumption of the air blower 37 and the threshold value is greater; the temperature of the cooling water in the radiator 27 is increased more.