Cathode side gas humidity adjusting system and method for proton exchange membrane fuel cell

Abstract

The invention relates to a cathode side gas humidity adjusting system and method for a proton exchange membrane fuel cell, and the system comprises an air filter, an air compressor, an intercooler, anair humidifier, a fuel cell stack, an exhaust back pressure valve, a tail gas processor, a humidity regulator, a three-way valve, and a fuel cell control unit. An outlet of the fuel cell stack is connected with an inlet of the humidity regulator, and the humidity regulator is connected with the air humidifier. The air humidifier is connected with the three-way valve, and the fuel cell control unit is connected with a water content sensor and a humidity regulator in the fuel cell stack. The humidity of air entering the fuel cell stack can be automatically adjusted according to the actual working requirements of the fuel cell stack, the phenomenon that the interior of the stack is too dry or too wet is avoided, the water balance in the stack is maintained, the output performance of the fuelcell is effectively improved, the operation stability of the fuel cell is guaranteed, and the reliability and durability of the stack are improved.

Description

technical field [0001] The invention relates to the technical field of fuel cell engines, in particular to a proton exchange membrane fuel cell cathode side gas humidity regulating system and method thereof. Background technique [0002] During the working process of the proton exchange membrane fuel cell, the proton exchange membrane needs to maintain a certain degree of humidity in order to maintain high proton conductivity and good operating characteristics. If the air humidity in the pile is too low, the membrane will be too dry, which will cause the proton exchange membrane to lose the ability to conduct protons. In severe cases, the membrane will be dehydrated, shrunk or even ruptured; Flooding, blocking the gas flow channel, and increasing the concentration polarization lead to a significant drop in battery performance. Therefore, maintaining the water balance inside the fuel cell by adjusting the humidity of the air entering the stack is a key issue to improve the p...

AI Technical Summary

Problems solved by technology

This process is an open-loop process, and the air humidity cannot be adjusted according to the actual working requirements of the fuel cell stack 5. It is easy to cause the air humidity entering the stack 5 to be too high or too low, which will affect the output of the fuel cell stack 5. Performance and reliability, durability

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