Patent ID: 8361667
Filing Date: 2013-01-29
Classification: H01M,Y02E,Y02T

Abstract:
1. A fuel cell system comprising: a fuel cell which generates a power and in which hydrogen ions formed in an anode pass through an electrolytic film and move to a cathode; a gas supply passage which supplies an oxidizing gas supplied from an oxidizing gas supply source to the cathode of the fuel cell; a gas discharge passage through which the gas discharged from the cathode of the fuel cell is circulated; a dilution device that dilutes the anode gas formed in the cathode of the fuel cell; a control device programmed to decrease the amount of a reactant gas to be supplied to the fuel cell to an amount smaller than that during normal power generation to realize low-efficiency power generation of the fuel cell, wherein the dilution device has a bypass passage which allows a part of the oxidizing gas flowing through the gas supply passage to bypass the fuel cell and which guides the gas to the gas discharge passage, and a bypass valve which regulates the flow rate of the oxidizing gas circulating through the bypass passage, and the dilution device dilutes the anode gas formed in the cathode of the fuel cell with the oxidizing gas flowing from the gas supply passage to the gas discharge passage through the bypass passage, wherein only when the dilution device is abnormal the control device is programmed to set the voltage lower limit value of the fuel cell so that the amount of an anode gas to be formed in a cathode of the fuel cell during the low-efficiency power generation is a predetermined amount or less.