Online monitoring method and system of hydrogen fuel cell stack, and hydrogen fuel electric vehicle using monitoring method

Abstract

The invention provides an online monitoring method and system of a hydrogen fuel cell stack, and a hydrogen fuel electric vehicle using the monitoring method. The working state of the hydrogen fuel cell stack is known in time by judging the single cell voltage state of the hydrogen fuel cell stack. On one hand, a related online fault diagnosis strategy can be executed on the stack before a single hydrogen fuel cell has an anti-pole phenomenon, so that the hydrogen fuel cell stack can be prevented from starting a shutdown protection process, and an online fault processing function is achieved on the hydrogen fuel cell stack; on the other hand, by monitoring the single cell voltage of the hydrogen fuel cell stack, whether the running temperature of the hydrogen fuel cell stack and the exhaust strategy are in the optimal working state or not can be judged, the output performance of the hydrogen fuel cell stack can be further improved, the utilization rate of hydrogen can be increased, the running cost of the hydrogen fuel cell stack is indirectly reduced, and the economic benefit is improved.

Description

technical field [0001] The invention relates to the technical field of hydrogen fuel cell stacks, in particular to an online monitoring method and system for hydrogen fuel cell stacks and a hydrogen fuel electric vehicle using the monitoring method. Background technique [0002] The fuel cell stack provides power output to the hydrogen fuel electric bicycle. The applicant of the present invention found the following technical problems in the prior art fuel cell stack during the research and development process: [0003] 1) During the operation of the stack, due to the failure of the gas seal and poor heat dissipation and drainage, the voltage of the stack will drop even worse, and the reverse polarity of the single cell will appear. The reverse polarity refers to the negative value of the single cell voltage. It is mainly caused by air leakage or impurities, and the reverse polarity phenomenon will cause irreversible damage to the stack, so the reverse polarity phenomenon is...

AI Technical Summary

Problems solved by technology

When the exhaust time is too short and the exhaust interval is too long, it will cause insufficient fuel inside the stack, which may cause the battery to form a reverse polarity phenomenon, and may cause the stack to catch fire; when the exhaust time is too long and the exhaust interval is too short, It will cause a large amount of unreacted hydrogen to be discharged to the outside of the stack, resulting in low hydrogen utilization rate and poor economic effect of hydrogen;

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