In-situ detection method and device for hydrogen permeation current of fuel cell stack

Abstract

The invention relates to an in-situ detection method and device for hydrogen permeation current of a fuel cell stack. The method comprises the steps of connecting a cathode outlet of a proton exchange membrane fuel cell stack to be detected with a cathode inlet of a hydrogen permeation sensing cell; introducing nitrogen into a cathode connecting circuit, introducing hydrogen into the anode of the hydrogen permeation sensing cell, and measuring the hydrogen permeation current iS2 of the hydrogen permeation sensing cell in the current state; introducing nitrogen into a cathode connecting circuit, introducing hydrogen into the anode of the proton exchange membrane fuel cell stack to be detected and the anode of the hydrogen permeation sensing cell, and measuring the hydrogen permeation current iS3 of the hydrogen permeation sensing cell in the current state; and obtaining a difference value between the hydrogen permeation current iS3 and the hydrogen permeation current iS2, wherein the difference value is a detection result of the hydrogen permeation current of the cell stack to be detected. Compared with the prior art, the method can effectively avoid the complexity of hydrogen permeation current measurement of the cell stack and the risk of potential damage to the cell stack during hydrogen permeation measurement, the measurement process is rapid and convenient, the applicability is wide, and the measurement result is accurate and visual.

Description

technical field [0001] The invention relates to the technical field of hydrogen permeation current measurement of a proton exchange membrane fuel cell stack, in particular to an in-situ detection method and device for hydrogen permeation current of a fuel cell stack. Background technique [0002] The membrane electrode of proton exchange membrane fuel cell (referred to as PEMFC) is composed of gas diffusion layer, catalyst layer and proton exchange membrane. The role of the proton exchange membrane includes isolating hydrogen and oxygen, blocking electrons and passing protons. Protons are transferred from the anode to the cathode through the proton exchange membrane, forming a circuit and generating an electric current. However, due to the concentration gradient of hydrogen on both sides of the proton exchange membrane and its own defects, a small amount of hydrogen permeates from the anode to the cathode through the proton exchange membrane, resulting in the reduction of e...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of high data sampling and processing complexity and the risk of damage to the internal components of the stack in the constant current charging method of the prior art, the in-situ detection cannot be realized by the mass spectrometer detection method, and the test cost is relatively high In order to provide an in-situ detection method and device for the hydrogen permeation current of the fuel cell stack, the hydrogen permeation current of the hydrogen permeation sensing cell under two states is measured to calculate the hydrogen permeation of the proton exchange membrane fuel stack to be tested. Current, realize the advantages of fast and convenient measurement process, wide applicability, accurate and intuitive measurement results, etc.

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