Humidification technology and humidification system for large power PEM fuel battery test platform

Abstract

This invention puts forward a design plan for wetting technology and system used in test platforms of large power fuel cells, which puts forward a heat-exchange system of two stages or multiple stages to transfer heat generated by fuel cells to reactant gas entering into the fuel cell, in order to increase the gas / liquid medium-transfer ability of the wet system, a high efficient filled converse flow spray tower is taken as a main wetting device and temperature of a spray medium is controlled accurately to guarantee temperature of wetting and saturation of vapor, which can control the relative humidity of the reactant gas entering into a fuel cell stack within +-2% and relative temperature in +-0.1deg.C by controlling the temperature of an overheater with an outer heater and efficient heat-transmitting filling component accurately, and a foam-removing system with accurate temperature control is matched to avoid liquid from entering into the back system.

Description

technical field [0001] The invention relates to fuel cell technology, in particular to a humidification technology and a humidification system for a high-power PEM fuel cell test bench. Background technique [0002] A proton exchange membrane fuel cell is a device that can continuously and efficiently convert hydrogen-rich fuel and oxidant into electrical energy. A proton exchange membrane fuel cell consists of a three-in-one membrane electrode (Membrane Electrode Assembly, MEA) assembled by coating catalytic layers on both sides of the proton membrane, a flow field plate on the fuel side of the reaction gas, and a flow field plate on the air side. Its core component is a three-in-one membrane electrode, and its structure is: a proton exchange membrane in the middle, a cathode catalytic layer and an anode catalytic layer on both sides, and a gas diffusion layer on the outermost side. [0003] When the proton exchange membrane fuel cell is working, the fuel passes through th...

AI Technical Summary

Problems solved by technology

Otherwise, when a large amount of dry air is supplied to the fuel cell, they will easily take away the water molecules in the proton exchange membrane when they leave, resulting in the inability of protons to pass through the proton exchange membrane, a sharp increase in the internal resistance of the electrode, and a sharp decline in battery performance

Therefore, the purpose of humidifying the proton exchange membrane in the fuel cell is to maintain the ability of the proton exchange membrane to transmit protons. If the humidification is insufficient, the transmission capacity of the proton exchange membrane will be poor, which will affect the performance of the battery; Degradation of battery performance

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