Water management system for proton exchange membrane fuel cell and working method thereof

Abstract

The invention discloses a water management system for a proton exchange membrane fuel cell.The water management system mainly comprises a hydrogen tank, a proton exchange membrane fuel cell module, an air pump and a signal processing module, wherein the proton exchange membrane fuel cell module comprises the proton exchange membrane fuel cell, a temperature sensor, a pressure sensor, a humidity sensor and a water level monitoring device. The invention further discloses a working method of the management system. The signal processing module controls a drainage device and a humidifying apparatus according to a water level status judgement result; the signal processing module controls to start the drainage device so as to reduce the water level of the interior of the fuel cell under the flooding condition; and the signal processing module controls the humidifying apparatus to increase the humidity of gas inputted in the fuel cell under the condition of lack of water, so that the water content of the interior of the fuel cell is increased. The water management of the fuel cell module is implemented through the method.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a proton exchange membrane fuel cell water management system and a working method thereof. Background technique [0002] A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy. Only electrochemical reactions occur, and there is no combustion process. [0003] The fuel cell can be an ideal all-solid-state mechanical structure, that is, there are no moving parts, such a system will potentially have high reliability and long life, and the fuel cell generates water when fueled by hydrogen and oxygen, without pollution and can be recycled use. [0004] Fuel cells have the advantages of high efficiency, no pollution, long life and high reliability. They can be used as a substitute for automotive internal combustion engines, and can also be used in small-scale centralized or decentralized power supply systems. Since the fuel ce...

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Problems solved by technology

[0006] Since the electrochemical reaction of the proton exchange membrane fuel cell is carried out on the water-gas-proton (electron) three-phase interface, when there is too much water in the catalytic layer, the excess water will dilute the concentration of the reaction gas and block the gas channel in the reaction zone. , resulting in flooding of the electrodes and affecting battery performance; too little water in the proton exchange membrane will cause the proton conductivity of the proton exchange membrane to decrease, resulting in a decrease in battery performance

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