Method controlling operation pressure stabilization of air and hydrogen in fuel cell

Abstract

The invention relates to a method for controlling and stabilizing the operating pressure of air and hydrogen of fuel cells, and includes a hydrogen storage tank, an air conveying device and a fuel cell stack, as well as an electromagnetic proportional valve and a pressure sensor, wherein the hydrogen storage tank / the air conveying device are connected with a hydrogen / air inlet of the fuel cell stack via the electromagnetic proportional valve; the pressure sensor is arranged at the hydrogen / air inlet part of the fuel cell stack, and connected with the electromagnetic proportional valve; the pressure sensor can detect the pressure of hydrogen / air entering the fuel cell stack and feed pressure signals back to the electromagnetic proportional valve; the electromagnetic proportional valve can automatically regulate the frequencies of opening and closing according to the pressure signals so as to keep the hydrogen / air entering the fuel cell stack under a constant pressure of the desired value. Compared with the prior art, the method has the advantages of simple structure, lower energy consumption, safe use, etc.

Description

technical field [0001] The invention relates to an auxiliary device of a fuel cell, in particular to a method for controlling the stability of the operating pressure of the fuel cell air and hydrogen. Background technique [0002] An electrochemical fuel cell is a device that converts hydrogen and oxidants into electrical energy and reaction products. The internal core component of the device is the membrane electrode (Membrane Electrode Assembly, referred to as MEA). The membrane electrode (MEA) is composed of a proton exchange membrane and two porous conductive materials, such as carbon paper, sandwiched between the two sides of the membrane. On the two boundary surfaces of the membrane and the carbon paper, there are even and finely dispersed catalysts for initiating electrochemical reactions, such as metal platinum catalysts. Conductive objects can be used on both sides of the membrane electrode to draw the electrons generated during the electrochemical reaction through...

AI Technical Summary

Problems solved by technology

[0014] 1. The volume and weight of the pressure reducing valve are often large, and it is troublesome to manufacture and connect;

[0015] 2. Due to the large changes in the working state of the fuel cell, such as large power output or small power output, it is often difficult for the pressure reducing valve to realize automatic pressure regulation, and it is difficult to achieve the purpose of always stabilizing the gas supply pressure;

[0016] 3. When the pressure reducing valve cannot stabilize the pressure of the fuel cell, it is easy to cause the gas flow in the fuel cell to change, making it difficult to control the power generation performance. If the pressure reducing valve fails, the high-pressure gas will break through the electrodes, causing fire and explosion in severe cases

Images