Online detection system and method for series leakage of fuel cell stack

Abstract

The invention relates to an online detection system and method for the series leakage of a fuel cell stack. The system comprises a gas loading device which injects hydrogen gas and nitrogen gas into the anode and cathode of the stack, a constant-voltage power source for applying a voltage to the anode and cathode of a single cell, an access selector which is used for the sequential gating of the single cell and applying a voltage, and a current meter for monitoring a current. The constant-voltage power source is connected to the anode and cathode of any one cell through the access selector toform a detection loop. The current meter is in series connection with a detection loop. During the detection of the series leakage of the stack, the gas loading device injects hydrogen gas and nitrogen gas into the anode and cathode of the stack, and the access selector sequentially selects the cells in the stack for the series leakage detection. During the series leakage detection of the cells, the constant-voltage power source applies the voltage to the anode and cathode of one cell, and the current meter obtains a current value of the detection loop. Compared with the prior art, the systemis accurate in testing, is high in universality, and is small in disturbance from the outside.

Description

technical field [0001] The invention relates to a fuel cell stack detection system and method, in particular to an online fuel cell stack leakage detection system and method. Background technique [0002] Proton exchange membrane fuel cell is a kind of clean energy. Due to its advantages of environmental protection, low noise and high energy, it is considered to be one of the most promising clean energy sources, and has been widely promoted in the field of vehicle energy. [0003] The core part of a proton exchange membrane fuel cell is a membrane electrode composed of a proton exchange membrane, a catalyst and a diffusion layer. Among them, the proton exchange membrane is used for proton conduction and cathode and anode gas isolation. In order to reduce the resistance of proton conduction, the thickness of the proton exchange membrane is getting thinner and thinner, but it brings the possibility of micropores or rupture. [0004] The phenomenon that the cathode and anode g...

AI Technical Summary

Problems solved by technology

In order to detect cross leakage, the full pressure test method is generally used in the laboratory and in the vehicle state, and the constant potential hydrogen leakage current test method is generally used under the condition of a single battery with a small leakage. For multi-cell stacks, there is currently no There are relatively mature cross-leakage detection methods

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