On-line monitoring method and system of hydrogen fuel cell stack and hydrogen fuel electric vehicle using the 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. By judging the voltage state of a single cell of a hydrogen fuel cell stack, the working of the hydrogen fuel cell stack can be known in time. state. On the one hand, relevant online fault diagnosis strategies can be implemented on the stack before the reverse polarity of the hydrogen fuel cell single cell occurs, which can prevent the hydrogen fuel cell stack from starting the shutdown protection process and perform an online fault processing function on the hydrogen fuel cell stack On the other hand, by monitoring the single-cell voltage of the hydrogen fuel cell stack, it can be judged whether the operating temperature of the hydrogen fuel cell stack and the exhaust strategy are in the optimal working state, which can further improve the output performance and Improving the utilization rate of hydrogen can indirectly reduce the operating cost of hydrogen fuel cell stacks and improve economic benefits.

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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