Humidifier leakage diagnosis method and fuel cell system

Abstract

The invention provides a humidifier leakage diagnosis method and a fuel cell system. The diagnosis method comprises the following steps: S1, shutting down the fuel cell system; S2, blowing the fuel cell system by continuously introducing air into the fuel cell system, keeping a throttle valve at the tail end of the fuel cell system at a set opening degree, and detecting an air path unit of the fuel cell system in the purging process; S3, acquiring the actual equivalent throttling flow of the air path unit according to the detection result, and judging the leakage degree of the humidifier in the fuel cell system according to the actual equivalent throttling flow. According to the humidifier leakage diagnosis method and the fuel cell system, the leakage degree of the humidifier can be diagnosed more accurately.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a humidifier leakage diagnosis method and a fuel cell system. Background technique [0002] Humidifiers are used in fuel cells, and sometimes humidifiers have internal leakage issues where part of the dry side airflow leaks directly to the wet side without passing through the stack, resulting in less air flowing through the stack. When the leakage is serious to a certain extent, it will have a greater negative impact on the operation of the fuel cell; specifically, it will affect the actual excess coefficient and humidity of the air path of the stack, and then affect the performance and life of the stack. In an actual fuel cell system, it is difficult to install a flow sensor at the stack inlet to actually measure the real air volume entering the stack. If there is an internal leakage of the humidifier, it will be difficult for the system to detect it in time. Moreover, in t...

AI Technical Summary

Problems solved by technology

[0002]Humidifiers are used in fuel cells, and sometimes humidifiers have internal leakage problems where a portion of the dry side airflow leaks directly to the wet side without passing through stack, resulting in less air flow through the stack

When the leakage is serious to a certain extent, it will have a greater negative impact on the operation of the fuel cell; specifically, it will affect the actual excess coefficient and humidity of the air circuit of the stack, and then affect the performance and life of the stack

In an actual fuel cell system, it is difficult to install a flow sensor at the stack inlet to actually measure the actual amount of air entering the stack

If there is an internal leakage of the humidifier, it will be difficult for the system to detect it in time

Moreover, it is also difficult to accurately diagnose the leakage of the humidifier in the prior art, and it is difficult to accurately compensate the amount of air flowing through the stack

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