A cathode circuit of a fuel cell system and a control method thereof

By introducing a cathode flow control module into the cathode circuit of the fuel cell system, the gas flow direction, flow rate and humidity are adjusted, and the problems such as hydrogen fire hazard, oxygen permeation and flooding in the fuel cell system during startup and shutdown are solved, thereby improving the reliability and durability of the system.

CN113851680BActive Publication Date: 2025-03-28JINHUA HYDROGEN TECH CO LTD
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Patent Information

Application Number
CN202010599234.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-06-28
Publication Date
2025-03-28
Estimated Expiration
2040-06-28

AI Technical Summary

Technical Problem

During the start-up and shutdown of the fuel cell system, there are problems such as hydrogen fire risk, oxygen penetration leads to reduced durability of the stack, and water freezing in low-temperature environments leading to startup failures and flooding.

Method used

A cathode circuit of a fuel cell system is designed, including an intake pipe, an air compressor, a humidifier, a stack, a throttle, an exhaust pipe and a controller. The cathode flow control module is used to adjust the gas flow direction, flow rate and humidity to achieve fine control of hydrogen concentration, oxygen content and stack humidity.

Benefits of technology

It effectively reduces the hydrogen concentration in the exhaust gas of the fuel cell, so that it is lower than the combustible limit, prevents air from entering the stack, and controls the humidity and flow of the air entering the stack, thereby improving the reliability and durability of the fuel cell system.

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Abstract

This invention relates to a cathode circuit of a fuel cell system and its control method. The cathode circuit includes an intake pipe, an air compressor, a humidifier, a fuel cell stack, a throttle valve, an exhaust pipe, and a controller. The intake pipe, air compressor, humidifier, and fuel cell stack inlet ends are sequentially connected via a cathode inlet pipe. The fuel cell stack outlet end is sequentially connected via a cathode outlet pipe to the humidifier and throttle valve, and then connected to the exhaust pipe along with the fuel cell stack's hydrogen exhaust pipe. A cathode flow control module is also connected to the cathode pipe. The cathode flow control module is connected to the air compressor, fuel cell stack, humidifier, and exhaust pipe, respectively. The cathode flow control module is normally open to the air compressor, and the opening degree between the cathode flow control module and the fuel cell stack, humidifier, and exhaust pipe is controlled by the controller. This invention can reduce the hydrogen concentration in the fuel cell exhaust gas and can seal the fuel cell stack when the fuel cell is off, preventing air from entering the fuel cell stack; it can also control the humidity and flow rate of the air entering the stack.
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