Fuel cell stack test board and back pressure control method thereof

Abstract

The invention discloses a fuel cell stack test board and a back pressure control method thereof. The test board comprises a hydrogen system and an air system. The hydrogen system is communicated witha hydrogen inlet of a fuel cell stack through an air inlet pipeline; the air system is communicated with an air inlet of the fuel cell stack through an air inlet pipeline; flow meters for detecting the flow of the air inlet pipelines are arranged on the air inlet pipelines; a hydrogen outlet and an air outlet of the fuel cell stack are respectively provided with an air outlet pipeline; first backpressure valves and second back pressure valves are arranged on the air outlet pipelines in parallel; the back pressure range of the first back pressure valve is smaller than that of the second back pressure valve; and pressure sensors used for detecting the pressure are arranged on pipeline sections between the air inlet pipeline or / and the air outlet pipeline and the first back pressure valve and between the air inlet pipeline or / and the air outlet pipeline and the second back pressure valve. According to the back pressure control method, double back pressure valves and two-way control are utilized, and back pressure control is rapidly achieved through different flow, higher-precision control is realized, and meanwhile, the coverage of a larger power range is realized, and the cost of the test board of a client is saved.

Description

technical field [0001] The invention relates to the technical field of fuel cell detection, in particular to a fuel cell stack test bench and a back pressure control method thereof. Background technique [0002] Due to the current vigorous promotion of fuel cells, the demand for stack test benches is also increasing. Conventional test bench controls, basic controls such as flow, humidification tank, back pressure, and heating are already very mature. [0003] But in use, firstly, the larger the power range value that customers are willing to cover, the better, but on a large test bench, it will take a long time to control the back pressure of small flow, and it will be distorted for online test conditions; secondly , During the test, the frequent opening and closing of the back pressure valve will affect its service life, especially when running and accelerating. Contents of the invention [0004] The object of the present invention is to propose a fuel cell stack test be...

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Problems solved by technology

[0003] But in use, firstly, the larger the power range value that customers are willing to cover, the better, but on a large test bench, it will take a long time to do small flow back pressure control, and it will be distorted for online test conditions; secondly , during the test, the frequent opening and closing of the back pressure valve will affect its service life, especially when running and accelerating

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