Cathode loop of fuel cell system and control method thereof

Abstract

The invention relates to a cathode loop of a fuel cell system and a control method of the cathode loop. The cathode loop comprises an air inlet pipe, an air compressor, a humidifier, an electric pile, a throttle valve, an exhaust pipe and a controller, wherein the air inlet pipe, the air compressor, the humidifier and the inlet end of the electric pile are sequentially connected through a cathode inlet pipeline, and the outlet end of the electric pile is sequentially connected with the humidifier and the throttle valve through a cathode outlet pipeline and then is connected to the exhaust pipe together with a hydrogen exhaust pipe of the electric pile. The cathode pipeline is further connected with a cathode flow control module, the cathode flow control module is communicated with the air compressor, the electric pile, the humidifier and the exhaust pipe, the cathode flow control module is normally communicated with the air compressor, and the opening degree of the cathode flow control module communicated with the electric pile, the humidifier and the exhaust pipe is controlled through a controller. According to the invention, the hydrogen concentration in the exhaust gas discharged by the fuel cell can be reduced, and the stack can be closed in the shutdown state of the fuel cell to prevent air from entering the stack; and the humidity and flow of air entering the pile can be controlled.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a cathode loop of a fuel cell system and a control method thereof. Background technique [0002] The cathode loop of the fuel cell is a structure that supplies air to the cathode of the fuel cell stack. The cathode circuit of a general fuel cell system includes air compressors, humidifiers, throttle valves and other components. The inlet air is compressed by the air compressor to become high-pressure air. After being further humidified by the humidifier, it enters the stack; the outlet air passes through the humidifier to provide moisture for the inlet air. The back pressure of the cathode outlet is controlled by a throttle valve to adjust the cathode pressure in the stack. The humid air discharged through the throttle will be discharged through the exhaust pipe together with the hydrogen discharged through the purge valve when the stack is running. [0003] However, in a ...

AI Technical Summary

Problems solved by technology

[0005] 2. After the shutdown of the fuel cell system is completed, the throttle valve is closed, but the air can still enter the stack from the air compressor, resulting in a high oxygen content in the cathode of the stack

In this case, it may cause excessive water content inside the stack, resulting in water flooding, resulting in operational failure

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