Patent ID: 8257874
Filing Date: 2012-09-04
Classification: H01M,Y02E

Abstract:
1. An operating method of a fuel cell system comprising a fuel cell stack, a fuel cell temperature sensor, a voltage sensor, a current sensor, a radiator, a fan, a cooling water pump and a bypass valve, the method comprising: measuring an internal temperature of said fuel cell with the fuel cell temperature sensor; measuring a power generation voltage of said fuel cell with the voltage sensor; measuring a current flowing from said fuel cell with the current sensor; and controlling, on the basis of voltage information measured by said voltage sensor, temperature information measured by said temperature sensor, and current information measured by said current sensor, at least one of an operation amount of said cooling water pump, an operation amount of said fan, and a cooling fluid amount flowing through said bypass valve; at the time of starting of said fuel cell system, when a displacement amount dV/dt of a fuel cell stack voltage V to time t is smaller than 0, a displacement amount dT/dt of a fuel cell stack temperature T to the time t is larger than 0, and a displacement amount dI/dt of a fuel cell stack current I to the time t is equal to or larger than 0, changing at least one of said operation amount of said cooling water pump, said operation amount of said fan, and said cooling fluid amount flowing through said bypass valve to increase a quantity of heat discharged externally from said fuel cell; and when the displacement amount dV/dt of the fuel cell stack voltage V to time t is equal to or larger than 0, stopping the cooling operation by using said cooling water pump, said by pass valve, and said fan.