Patent ID: 6860349

Claim:
A cooling system for a fuel cell powered vehicle wherein a fuel cell is mounted as a power source of an electric vehicle motor, the cooling system comprising: a primary circulation passage arranged to allow primary coolant to be circulated through a primary circulation pump to cool the fuel cell; a secondary circulation passage arranged to circulate secondary coolant through a secondary circulation pump; a primary heat exchanger for achieving heat exchange between the primary coolant and the secondary coolant; and a secondary heat exchanger for achieving heat exchange between the secondary coolant and the flow of outside air; wherein the primary circulation pump is connected to and driven with a first rotatable shaft of a pump drive motor and the secondary circulation pump is connected to and driven with a second rotatable shaft on an opposite side of the pump drive motor; wherein the primary circulation pump and the secondary circulation pump are constructed such that flow rates of the primary and secondary circulation pumps are differentiated; wherein the flow rate of the primary circulation pump is determined such that a temperature of the primary coolant flowing through an inlet side of the primary heat exchanger and a temperature of the primary coolant flowing through an outlet side of the primary heat exchanger are different to remain in a predetermined temperature difference, and wherein the flow rate of the secondary circulation pump is determined so as to allow a temperature of the primary coolant flowing through an outlet side of the primary heat exchanger to remain at a predetermined temperature.