Fuel cell system
First Claim
1. A fuel cell system comprising:
- a fuel cell stack comprising a plurality of laminated cells, each of the laminated cells including an electrolyte membrane interposed between a fuel electrode receiving a supply of fuel gas and an oxidizing agent electrode receiving a supply of oxidizing agent gas;
a fuel gas supply device that supplies a fuel gas to the fuel electrode;
an oxidizing agent gas supply device that supplies an oxidizing agent gas to the oxidizing agent electrode;
a fuel electrode side discharge system that discharges a discharge gas from the fuel electrode to an external;
a circulation device that recirculates the discharge gas discharged from the fuel electrode into an upstream side of the fuel electrode;
a voltage limit device that limits a voltage across the fuel cell stack by drawing a current from the fuel cell stack at a time of an activation of the fuel cell system; and
a controller that, at the time of the activation of the fuel cell system, halts the supply of the oxidizing agent gas to the oxidizing agent electrode from the oxidizing agent gas supply device, inhibits a discharge of the discharge gas to the external through the fuel electrode side discharge system, and starts the supply of fuel gas to the fuel electrode from the fuel gas supply device in a state where the discharge gas is circulated through the fuel cell by the circulation device.
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Accused Products
Abstract
A fuel cell system that has a fuel cell stack with a plurality of laminated cells, each of the laminated cells includes an electrolyte membrane interposed between a fuel electrode receiving a supply of fuel gas and an oxidizing agent electrode receiving a supply of oxidizing agent gas. A fuel gas supply device supplies a fuel gas to the fuel electrode. An oxidizing agent gas supply device supplies an oxidizing agent gas to the oxidizing agent electrode. A fuel electrode side discharge system discharges a discharge gas from the fuel electrode to an external. A circulation device re-circulates the discharge gas discharged from the fuel electrode into an upstream side of the fuel electrode. A voltage limit device limits a voltage across the fuel cell stack by drawing a current from the fuel cell stack at a time of an activation of the fuel cell system. A controller halts the supply of the oxidizing agent gas to the oxidizing agent electrode from the oxidizing agent gas supply device at the time of the activation of the fuel cell system, inhibits a discharge of the discharge gas to the external through the fuel electrode side discharge system, and starts the supply of fuel gas to the fuel electrode from the fuel gas supply device in a state where the discharge gas is circulated through the circulation device.
26 Citations
21 Claims
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1. A fuel cell system comprising:
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a fuel cell stack comprising a plurality of laminated cells, each of the laminated cells including an electrolyte membrane interposed between a fuel electrode receiving a supply of fuel gas and an oxidizing agent electrode receiving a supply of oxidizing agent gas;
a fuel gas supply device that supplies a fuel gas to the fuel electrode;
an oxidizing agent gas supply device that supplies an oxidizing agent gas to the oxidizing agent electrode;
a fuel electrode side discharge system that discharges a discharge gas from the fuel electrode to an external;
a circulation device that recirculates the discharge gas discharged from the fuel electrode into an upstream side of the fuel electrode;
a voltage limit device that limits a voltage across the fuel cell stack by drawing a current from the fuel cell stack at a time of an activation of the fuel cell system; and
a controller that, at the time of the activation of the fuel cell system, halts the supply of the oxidizing agent gas to the oxidizing agent electrode from the oxidizing agent gas supply device, inhibits a discharge of the discharge gas to the external through the fuel electrode side discharge system, and starts the supply of fuel gas to the fuel electrode from the fuel gas supply device in a state where the discharge gas is circulated through the fuel cell by the circulation device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A fuel cell system comprising:
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a fuel cell stack comprising a plurality of laminated cells, each of the laminated cells including an electrolyte membrane interposed between a fuel electrode for receiving a supply of fuel gas and an oxidizing agent electrode for receiving a supply of oxidizing agent gas;
means for supplying a fuel gas to the fuel electrode;
means for supplying an oxidizing agent gas to the oxidizing agent electrode;
means for discharging discharge gas from the fuel electrode to outside of the fuel cell;
means for recirculating the discharge gas discharged from the fuel electrode into an upstream side of the fuel electrode;
means for limiting a voltage across the fuel cell stack by drawing a current from the fuel cell stack at a time of an activation of the fuel cell system; and
a controller means, at the time of the activation of the fuel cell system, for halting the supply of the oxidizing agent gas to the oxidizing agent electrode from the means for supplying oxidizing agent gas at the time of the activation of the fuel cell system, for inhibiting a discharge of the discharge gas to outside of the fuel cell through the fuel electrode side discharging means at the time of the activation of the fuel cell system, and for starting the supply of fuel gas to the fuel electrode from the fuel gas supplying means in a state where the discharge gas is circulated through the fuel cell by the recirculation means at the time of the activation of the fuel cell system.
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21. A method of reducing polarity reversal in a fuel cell system of the type with a fuel cell stack having a plurality of laminated cells, each of the laminated cells including an electrolyte membrane interposed between a fuel electrode for receiving a supply of fuel gas and an oxidizing agent electrode for receiving a supply of oxidizing agent gas;
- a fuel gas supply to the fuel electrode;
an oxidizing agent gas supply to the oxidizing agent electrode;
a discharge of discharge gas from the fuel electrode to outside of the fuel cell;
the method comprising;
recirculating the discharge gas discharged from the fuel electrode into an upstream side of the fuel electrode;
limiting a voltage across the fuel cell stack by drawing a current from the fuel cell stack at a time of an activation of the fuel cell system; and
controlling the fuel cell system by halting the supply of the oxidizing agent gas to the oxidizing agent electrode from the oxidizing agent gas supply at the time of the activation of the fuel cell system, by inhibiting a discharge of the discharge gas to outside of the fuel cell at the time of the activation of the fuel cell system, and by starting the supply of fuel gas to the fuel electrode from the fuel gas supply in a state where the discharge gas is recirculating through the fuel cell at the time of the activation of the fuel cell system.
- a fuel gas supply to the fuel electrode;
Specification