Start-up preparation method for fuel cell system

Abstract

The invention provides a start-up preparation method for a fuel cell system. The method comprises the following steps: opening a bypass valve; starting an air compressor of an air supply assembly; starting a hydrogen supply assembly; opening an inlet throttle and an outlet throttle in the air supply assembly; and closing a tailgate valve. The advantages of the method are as follows: the opening ofa fuel cell air supply system is not restricted by the off state of an electric pile, and the starting can be performed before anode hydrogen purging or performed synchronously with the anode hydrogen purging; flexible opening of the fuel cell air supply system under the off state of the electric pile is realized; the air requirements of dilution of mixed air generated by anode hydrogen purging and ventilation of a fuel cell box body are met; the start-up time of the fuel cell air compressor is more flexible; slowing down of the lag effect due to the transient response of the air compressor can be avoided, and the on-off time of the fuel cell can be shortened.

Description

technical field [0001] The present invention relates to a control method, in particular to a start preparation method for a fuel cell system. Background technique [0002] Hydrogen fuel cell vehicle technology is becoming more and more mature. As a new energy vehicle with zero pollution and zero emissions, hydrogen fuel cell vehicles have increasingly entered the transportation system and have been widely recognized by the public. Fuel cell vehicles use hydrogen as fuel, and through the fuel engine, chemical energy is efficiently converted into electrical energy to drive the vehicle. The whole process only discharges pure water, so it is the most ideal energy-saving, environmentally friendly and zero-emission vehicle to replace traditional fossil fuel vehicles in the near future Transportation. [0003] In the air supply system of the fuel cell, the air compressor is the power source of the air flow. Air is sucked in from the environment, and enters the cathode side of the ...

AI Technical Summary

Problems solved by technology

For the start-up process of the fuel cell, in order to prevent the attenuation of the life of the stack caused by the "hydrogen-oxygen interface", the anode hydrogen purge is performed before the stack air supply is turned on. At this time, the fuel cell air supply cannot be used to realize the anode hydrogen purge. The hydrogen concentration of the mixture in the hydrogen chamber is diluted

The start-up of the fuel cell air compressor needs to be carried out sequentially after the hydrogen side purge is completed, and the battery intake and exhaust throttle valves are opened. Including the transient response lag of the air compressor, the total start-up time becomes longer

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