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Fuel cell system and control method of the same
| Details |
Inventors: Nakanishi, Haruyuki; Matsumoto, Shinichi;
Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota, JP)
Primary Examiner: Ryan; Patrick Joseph
Assistant Examiner: Mercado; Julian
Attorney, Agent or Firm: Kenyon & Kenyon LLP
A fuel cell system in which fuel gas and oxidizing gas are supplied to a fuel cell stack and power generation is performed by electrochemical reaction between the fuel gas and the oxidizing gas, and a control method thereof are provided. This fuel cell system includes a fuel gas supply manifold which is extended in a unit cell stacking direction and which distributes the fuel gas to a fuel gas passage; a switching device which is provided inside the fuel gas supply manifold, and which switches between permission and prohibition of distribution of the fuel gas to the fuel gas passage of each of the unit cells; a load disconnect device which disconnects an output terminal of the stack from a load; a short-circuit device which short-circuits a positive electrode and a negative electrode of the output terminal of the stack; and a control device which short-circuits the positive electrode and the negative electrode of the output terminal by the short-circuit device after distribution of the fuel gas to the fuel gas passage of each of the unit cells is prohibited by the switching device when the output terminal is disconnected from the load by the load disconnect device. |
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DETAILED DESCRIPTION The invention is made in consideration of the above-described problem.
It is an object of the invention to provide a fuel cell system in which cross leak can be prevented when an output terminal of a stack is disconnected from a load, and a control method thereof.
Also, it is another object of the invention to provide a fuel cell system in which deterioration of fuel economy can be prevented when cross leak is prevented, and a control method thereof.
According to an exemplary embodiment of the invention, a fuel cell system in which fuel gas and oxidizing gas are supplied to a fuel cell stack that is formed by stacking a plurality of unit cells, and power generation is performed by electrochemical reaction between the fuel gas and the oxidizing gas is provided.
This system includes a fuel gas supply manifold which is extended in the unit cell stacking direction and which distributes fuel gas to a fuel gas passage of each of the unit cells, a switching device which is provided inside the fuel gas supply manifold and which switches between permission and prohibition of distribution of the fuel gas to the fuel gas passage of each of the unit cells, a load disconnect device which disconnects the output terminal of the stack from the load, a short-circuit device which short-circuits the positive electrode and the negative electrode of the output terminal of the stack, and a control device which short-circuits the positive electrode and the negative electrode of the output terminal by the short-circuit device after distribution of the fuel gas to the fuel gas passage of each of the unit cells is prohibited by the switching device when the output terminal is disconnected from the load by the load disconnect device.
In a fuel cell system with such a configuration, when the output terminal of the fuel cell stack is disconnected from the load, the hydrogen in each of the unit cells is consumed by short-circuiting the positive electrode and the negative electrode of the output terminal of the stack after distribution of the fuel gas to the fuel gas passage is prohibited in the fuel gas supply manifold
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