System and method for rapidly detecting series leakage of fuel cell stack

Abstract

The invention relates to a system and method for rapidly detecting series leakage of a fuel cell stack. The problems that an existing hydrogen fuel cell detection system is single in detection methodand poor in accuracy are solved. The system comprises a fuel cell stack provided with a hydrogen cavity, a water cavity and an air cavity which are independent of one another, wherein the hydrogen cavity is provided with a hydrogen cavity inlet and a hydrogen cavity outlet which are communicated with each other; the water cavity is provided with a water cavity inlet and a water cavity outlet whichare communicated with each other; the air cavity is provided with an air cavity inlet and an air cavity outlet which are communicated with each other; the hydrogen cavity inlet, the water cavity inlet and the air cavity inlet are respectively connected with inlet valves; the inlet valves are respectively connected with a nitrogen injection device in parallel; the hydrogen cavity outlet, the watercavity outlet and the air cavity outlet are respectively connected with outlet valves; and pressure gauges are respectively arranged between the hydrogen cavity outlet and the outlet valve, between the water cavity outlet and the outlet valve and between the air cavity outlet and the outlet valve. The system has the advantages of simple structure and good detection effect.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a system and method for rapidly detecting cross-leakage of fuel cell stacks. Background technique [0002] According to the working mechanism of the hydrogen / air proton exchange membrane fuel cell, the interior of the stack is exposed to relatively harsh environments such as high temperature, high pressure, humidity, and acidity for a long time during operation, which will accelerate the erosion and aging of various components inside the fuel cell. Therefore, the fuel cell After a long period of operation, there may be internal damage to the stack, including corrosion and cracking of the plates, diaphragm damage, and aging failure of the sealing ring. Once a similar failure occurs, hydrogen and air will mix and leak in the one-sided flow channel. When the hydrogen concentration reaches a certain critical value, under the action of the catalyst, it will cause the hydrogen to re...

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Problems solved by technology

[0004] The above scheme solves to a certain extent the problem that the existing hydrogen fuel cell detection device cannot accurately detect the leakage at the initial stage and cannot detect the fault in real time, so as to shut down the fuel cell in time, but there are still many deficiencies in this scheme. For example: it only detects whether the hydrogen gas leaks, but cannot detect whether there is a cross-leakage between the air, hydrogen gas, and water chambers. The detection method is single and the accuracy is not good.

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