Fuel cell system comprising a voltage limit device

Details Fuel cell system comprising a voltage limit device Fuel cell system comprising a voltage limit device

2011-07-12

2011-07-12

Yuan, Dah-Wei D (Department: 1727)

Chemistry: electrical current producing apparatus, product, and

Fuel cell, subcombination thereof, or method of making or...

Process or means for control of operation

C429S431000, C429S512000

Reexamination Certificate

active

07976995

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.

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