Fuel cell hydrogen and air supply control method, device and system

Abstract

The invention relates to a fuel cell hydrogen and air supply control method, device and system. The method comprises the steps of: obtaining the output current of a fuel cell; determining an air flowand an air pressure required by a galvanic pile inlet according to the output current, and adjusting the fuel cell air supply according to the air flow and the air pressure required by the galvanic pile inlet; determining the hydrogen pressure required by the galvanic pile inlet according to the air pressure required by the galvanic pile inlet and a preset hydrogen-air pressure difference, and adjusting the fuel cell hydrogen supply according to the hydrogen pressure required by the galvanic pile inlet, so that a difference between the real-time pressure difference of the galvanic pile inlet and the preset hydrogen-air pressure difference is within a preset range, wherein the real-time pressure difference is a difference between the real-time hydrogen pressure of the galvanic pile inlet and the real-time air pressure of the galvanic pile inlet. The method can avoid great changes in pressure difference on both sides of a proton exchange membrane of the fuel cell, and ensure the performance and the service life of the fuel cell.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell hydrogen and air supply control method, device and system. Background technique [0002] Under the background of increasing global energy demand and intensified environmental crisis, new clean energy has attracted more and more attention. Among them, hydrogen fuel cells have the advantages of high efficiency, zero pollution, low noise and fast start-up, and have broad application prospects. They are one of the development directions of the next generation of vehicle power. [0003] A hydrogen fuel cell is a device that generates electricity by chemically reacting hydrogen and oxygen. The reaction process is the reverse process of electrolysis of water, and the reaction principle is as follows. [0004] Negative electrode: H 2 +2OH - →2H 2 O+2e - . [0005] Positive electrode: 1 / 2O 2 +H 2 O+2e - →2OH - . [0006] Battery response: H 2 +1 / 2O 2 ==H 2 O....

AI Technical Summary

Problems solved by technology

[0008] However, the existing vehicle-mounted fuel cell hydrogen control device mainly uses a two-stage pressure reducing valve to set the hydrogen pressure input to the fuel cell stack at a fixed value, which cannot adjust the pressure difference between hydrogen and air, resulting in pressure on both sides of the proton exchange membrane. Frequent fluctuations in pressure difference

The proton exchange membrane will creep under the alternating stress caused by pressure fluctuations. If it is in this state for a long time, it is prone to fatigue failure, which seriously affects the performance and life of the fuel cell.

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