Method for Measuring Water Content in Proton Exchange Membrane Fuel Cell Membrane
A proton exchange membrane and fuel cell membrane technology, which is applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve problems such as the inability to accurately measure the water content in the proton exchange membrane fuel cell membrane, and achieve convenient operation and accurate measurement results. Effect
Active Publication Date: 2022-02-11
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0005] The purpose of the present invention is to provide a method for measuring the non-membrane resistance and water content in the membrane of a proton exchange membrane fuel cell, so as to make up for the problem that the water content in the membrane of a proton exchange membrane fuel cell cannot be accurately measured in the prior art
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Embodiment 1
[0045] The preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings. In this example, the effective area is 5cm 2 The single cell is used as the research object, and the gas diffusion layer composed of metal bipolar plate, graphite flow field, carbon paper coated with microporous layer, and the platinum catalyst loading of cathode and anode are respectively 0.4mg / cm 2 and 0.2mg / cm 2 The catalytic layer and perfluorosulfonic acid proton exchange membrane (Nafion 211).
[0046] In order to illustrate that the non-membrane resistance part of the internal resistance of the fuel cell is a constant value within a certain range of water content, the following method is adopted:
[0047]By fixing the temperature of the fuel cell at 65°C and changing the dew point temperature in the bubbling humidifier, a series of nitrogen with different relative humidity can be obtained. The relative humidity of nitrogen is 20...
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The invention discloses a method for measuring water content in a proton exchange membrane fuel cell membrane, which belongs to the technical field of fuel cells and comprises the following steps: pre-measure the non-membrane resistance part of the internal resistance of the fuel cell and preset it in the fuel cell system; When measuring the water content in the membrane, the internal resistance of the fuel cell is collected through the resistance measuring device installed at both ends of the positive and negative electrodes of the proton exchange membrane fuel cell, and the preset non-membrane resistance part is deducted from the internal resistance of the fuel cell to obtain the proton exchange membrane resistance. Membrane resistance of the membrane fuel cell. According to the membrane resistance of the fuel cell, the water content in the proton exchange membrane is calculated. The invention can realize on-line accurate monitoring of the water content in the fuel cell membrane. The method solves the problem that the prior art cannot accurately measure the water content in the fuel cell membrane.
Description
technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cell, in particular to a method for measuring the water content in the membrane of the proton exchange membrane fuel cell. Background technique [0002] Under the dual challenges of energy crisis and environmental problems, proton exchange membrane fuel cells have attracted much attention due to their high efficiency and low emissions, and are considered to be ideal candidates to replace internal combustion engines as power sources for new energy vehicles. With the gradual commercialization of proton exchange membrane fuel cells, more and more attention has been paid to its performance stability and service life. As an important issue in the practical application of proton exchange membrane fuel cells, water management greatly affects the performance and service life of the battery. Cause local anti-polarity; too dry water will lead to a decrease in the conductivity of the p...
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IPC IPC(8): G01R27/02G01R31/385G01R31/389G01N27/04
CPCG01R27/02G01R31/385G01R31/389G01N27/041G01N27/048
Inventor 孙树成杨小康孙嘉琦俞红梅邵志刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI