Pressure drop and flow uniformity monitoring system of PEMFC flow field plate

Abstract

The invention discloses a pressure drop and flow uniformity monitoring system based on a PEMFC flow field plate. The system comprises a plurality of monitoring assemblies and a computer system; the flow field plate is provided with a plurality of flow passages; each flow passage is provided with at least two monitoring assemblies; each monitoring assembly is connected with the computer system; themonitoring assemblies are used for monitoring pressures in the flow passages and sending pressure signals to the computer system; and the computer system is used for receiving the pressure signals ofat least two positions in the flow passages, calculating gas flow distribution in the flow passages through pressure drop and flow relations of fluids in the flow passages according to pressure drops, and obtaining flow distribution of gas in the flow passages of the flow field plate. The invention further provides a pressure drop and flow uniformity monitoring method based on the PEMFC flow field plate. The system and the method have the beneficial effects that a pressure sensor is arranged in each flow passage of the flow field plate and is connected with the computer system; in a reactionprocess, an actual pressure in the flow field plate is measured through the pressure sensors, and then analysis and calculation are carried out by the computer system to obtain real distribution condition of the gas in the flow field plate; and the method has an important significance in optimizing the structure of the flow field plate.

Description

technical field [0001] The invention relates to the technical field of proton exchange membrane fuel cells, in particular to a PEMFC flow field plate pressure drop and flow uniformity testing system and method. Background technique [0002] Due to environmental pollution and energy shortage, human beings are currently devoting themselves to the development of new energy sources. Among many new energy sources, proton exchange membrane fuel cells have become one of the emerging hot research energy sources because of their high energy conversion efficiency, long life, high specific power, and environmental friendliness. [0003] During the working process of proton exchange membrane fuel cell (PEMFC), the reactant gas is distributed through the flow field plate and then diffused to the catalytic layer for reaction. However, due to the unreasonable design of the flow field plate and the fluid distribution area, the reaction gas distribution is uneven, which in turn causes the p...

AI Technical Summary

Problems solved by technology

However, due to the unreasonable design of the flow field plate and the fluid distribution area, the reaction gas distribution is uneven, which in turn causes the physical field distribution such as current density and temperature to be uneven, and the membrane wetting state is uneven, which can easily cause local failure of the membrane electrode. Directly affect the durability and power generation efficiency of the battery stack

In addition, during the working process of the fuel cell, local blockage and flooding of the flow field plate will also affect the power generation efficiency of the fuel cell and damage the life of the fuel cell.

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