Patent ID: 8841038

Claim:
A fuel cell system, comprising: a fuel cell stack including: a hydrogen inlet port connected to a hydrogen source via a hydrogen supplying pipeline, so that hydrogen is supplied from the hydrogen source to the fuel cell stack via the hydrogen supplying pipeline and the hydrogen inlet port; a hydrogen outlet port, via which the unreacted hydrogen is discharged from the fuel cell stack; an oxygen inlet port connected to an oxygen source via an oxygen supplying pipeline, so that oxygen is fed from the oxygen source via the oxygen supplying pipeline and the oxygen inlet port into the fuel cell stack; an oxygen outlet port, via which unreacted oxygen is discharged from the fuel cell stack, an unreacted oxygen discharge pipeline being connected at a first end to the oxygen outlet port; an unreacted hydrogen discharge pipeline connected at a first end to the hydrogen outlet port for leading out the unreacted hydrogen discharged from the fuel cell stack via the hydrogen outlet port; a humidifier, coupled between the oxygen inlet port and an oxygen source, the humidifier including: an oxygen source inlet port coupled to the oxygen source; a humidified oxygen outlet port coupled to the oxygen inlet port; an unreacted gas inlet port; a humidified unreacted gas outlet port; and a gas mixing device connected to a second end of the unreacted hydrogen discharge pipeline, a second end of the unreacted oxygen discharge pipeline, and the unreacted gas inlet port of the humidifier, so that the unreacted hydrogen discharged from the hydrogen outlet port and the unreacted oxygen discharged from the oxygen outlet port are mixed in the gas mixing device to form an unreacted gas mixture thereby reducing the concentration of unreacted hydrogen, and then the unreacted gas mixture is led to the unreacted gas inlet port of the humidifier to further mix the unreacted gas mixture and reduce the concentration of unreacted hydrogen, and the further mixed unreacted gas mixture then being discharged from the unreacted gas outlet port.