Method for managing hydrogen when hydrogen supply system of fuel cell vehicle stops working

Abstract

The invention provides a method for managing hydrogen when a hydrogen supply system of a fuel cell vehicle stops working. The hydrogen supply system comprises a hydrogen bottle and a hydrogen supply pipeline, wherein the hydrogen bottle is used for supplying hydrogen to a cell stack through the hydrogen supply pipeline; a combination valve, an overflow valve, a pressure reducing valve, a secondary pressure reducer and a stack inlet electromagnetic valve are sequentially connected on the hydrogen supply pipeline between the hydrogen bottle and the cell stack; the combination valve comprises a hydrogen bottle electromagnetic valve used for connecting and disconnecting hydrogen of the hydrogen bottle; hydrogen comes from the hydrogen bottle, flows sequentially through the hydrogen bottle electromagnetic valve, the overflow valve, the pressure reducing valve, the secondary pressure reducer and the stack inlet electromagnetic valve, and finally enters the cell stack when the hydrogen supply system works; when the hydrogen supply system stops working, the hydrogen bottle electromagnetic valve is closed at first, and the stack inlet electromagnetic valve is closed after 2-3 seconds. According to the hydrogen managing method, the gas pressure in the pipeline of the hydrogen system is reduced to a low level, and the potential safety hazard of the system can be reduced.

Description

technical field [0001] The invention relates to a hydrogen management method when the hydrogen supply system of a fuel cell vehicle stops working, and belongs to the technical field of fuel cell vehicles. Background technique [0002] A fuel cell vehicle is a type of electric vehicle. A fuel cell is a device that directly converts the chemical energy of fuel into electrical energy through an electrochemical reaction without burning. The chemical reaction of the fuel cell does not produce harmful products. Therefore, the fuel cell The car is a pollution-free car, and the energy conversion efficiency of the fuel cell is 2~3 times higher than that of the internal combustion engine. In a fuel cell, a fuel cell stack including a fuel cell assembly (in which a plurality of unit cells are stacked) and other peripheral elements generates electricity, hydrogen is supplied to the anode as a fuel gas, and oxygen is supplied to the cathode as an oxidant. [0003] In the fuel cell vehic...

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Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a hydrogen management method when the hydrogen supply system of a fuel cell vehicle stops working, which is used to solve the problem of simultaneous closing of the solenoid valve of the hydrogen cylinder and the stack solenoid valve in the prior art. This leads to the problem of excessive hydrogen pressure in the pipeline of the hydrogen supply system

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