Patent ID: 8129061

Claim:
A device for cooling a fuel cell that adjusts a temperature of the fuel cell to a target set temperature by supplying a coolant, comprising: an electric conductivity sensor that measures an electric conductivity of the coolant; a temperature sensor that measures a temperature of the coolant; and a control unit that stores a correlation between the temperature and the electric conductivity of the coolant, the control unit being programmed to estimate an electric conductivity at the target set temperature based on the electric conductivity of the coolant, the temperature of the coolant, and the correlation between the temperature and the conductivity of the coolant, and based on a correlation between a parameter related to the temperature of the coolant and the electric conductivity of the coolant, when the electric conductivity at the target set temperature exceeds a target electric conductivity range, the control unit being programmed to control the parameter related to the temperature of the coolant so as to maintain the electric conductivity at the target set temperature within the target electric conductivity range.