Method for detecting blow-by of hydrogen and oxygen in fuel cell stack quickly

Abstract

The invention relates to a method for detecting the blow-by of hydrogen and oxygen in a fuel cell stack quickly, which comprises the following steps: mounting the stack on a detection platform to connect the stack and a gas pipeline of a test platform and a circuit of a voltage routing inspection system; introducing hydrogen cavity detection gas into a hydrogen cavity of the stack, introducing oxygen cavity detection gas to an oxygen cavity, and enabling the stack to enter the generating state; and after voltages of cells in the stack are in an open circuit state of over 0.9 V, stopping introducing the oxygen cavity detection gas, continuing to introduce the hydrogen cavity detection gas to the hydrogen cavity, keeping pressure and recording the change of the cell voltages of the fuel cell stack under the state. Thus, a position in which the cell that the voltage of a single cell in the fuel cell stack drops quickly is positioned is a specific position of the blow-by of an oxy-hydrogen cavity. The method can detect the specific position of the blow-by of the hydrogen and oxygen in the fuel cell stack quickly, has the characteristics of novel and simple structure, quick test time, accurate test and the like, and belongs to the method for detecting the blow-by of the hydrogen and oxygen in the fuel cell stack which integrates economy and practicability into a whole.

Description

technical field [0001] The invention relates to the field of fuel cells, in particular to a rapid detection method for hydrogen-oxygen crossover of fuel cell stacks. Background technique [0002] A fuel cell stack is composed of many single cells, and a stack contains several, dozens or even hundreds of single cells. If there is gas crossover in the hydrogen-oxygen cavity in the stack, there will be a great safety hazard in the operation of the stack. Usually, the anode cavity of the fuel cell is hydrogen fuel, and the cathode cavity is the oxidant. Usually the oxidant is oxygen or air. If the hydrogen is mixed with oxygen or air in the cathode chamber (or the oxygen is in the anode chamber), it is easy to reach the explosion limit and cause a safety accident. Since the fuel cell stack is composed of many single cells, it is difficult to avoid defects in individual components such as MEA, glue lines and bipolar plates during the preparation process and damage to components ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a detection method for quickly detecting the specific position of hydrogen-oxygen cross-gas in the fuel cell stack, which solves the problem in the prior art that it is difficult to determine the specific position of hydrogen-oxygen cross-gas in the stack, so that it can be quickly measured The specific location of the hydrogen-oxygen cross-gas in the fuel cell stack eliminates the safety hazards caused by the hydrogen-oxygen cross-gas in the stack and improves the quality of the stack

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