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A method for normal shutdown of a hydrogen fuel cell system

A fuel cell system and fuel cell stack technology, applied in fuel cells, fuel cell control, fuel cell additives, etc., can solve problems such as opening impact, danger, and hydrogen side infiltration into air, etc.

Active Publication Date: 2022-06-07
WUHAN GROVE HYDROGEN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former process will have a serious impact on the next start-up of the hydrogen fuel cell system, which will cause air to infiltrate the hydrogen side and form a hydrogen-air interface on the anode side, which is a relatively dangerous working condition

Method used

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  • A method for normal shutdown of a hydrogen fuel cell system

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Embodiment Construction

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0022] Please refer to figure 1 , the embodiment of the present invention provides a normal shutdown method of a hydrogen fuel cell system, the steps are:

[0023] In step S1, the output current of the hydrogen fuel cell stack is adjusted so that the highest value of the voltage of each cell of the hydrogen fuel cell stack is less than 0.8V; at the same time, the output current of the hydrogen fuel cell stack is not easy to be too large, and is maintained at about 60A;

[0024] Step S2, setting the opening time and closing time of the tail exhaust of the hydrogen fuel cell stack; during the shutdown process of the hydrogen fuel cell system, the drain closing time and the exhaust closing time of the hydrogen fuel cell system are both set to 10S, and the...

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Abstract

The present invention provides a method for normal shutdown of a hydrogen fuel cell system. The shutdown sequence of the normal shutdown method is as follows: firstly shut down the air compressor, then shut down the stack throttle valve of the air path of the fuel cell system, and then shut down the DC / DC conversion of the hydrogen fuel cell Then turn off the hydrogen circulation pump, the hydrogen inlet solenoid valve and the stack exhaust device, and finally turn off the water pump and cooling fan in the hydrogen fuel cell system. The shutdown sequence can prevent damage to the catalyst and proton exchange membrane in the electric stack, thereby prolonging the service life of the proton exchange membrane fuel cell.

Description

technical field [0001] The invention relates to the technical field of hydrogen energy vehicles, in particular to a method for normal shutdown of a hydrogen fuel cell system. Background technique [0002] During the operation of the hydrogen fuel cell system, a large amount of water will be generated. If the water cannot be blown out of the stack before the hydrogen fuel cell system is turned off, it will cause water accumulation in the stack, which will affect the next operation of the hydrogen fuel cell system. have an impact, which in turn affects the service life of the hydrogen fuel cell stack. [0003] The purging process is particularly important in the shutdown process of the hydrogen fuel cell system. The purging process can not only avoid the occurrence of water accumulation in the stack, but also protect the performance of the hydrogen fuel cell stack, thereby prolonging the use time of the stack. ; The hydrogen fuel cell DC / DC converter is an important device fo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/04303H01M8/04298H01M8/04111H01M8/04082H01M8/04007
CPCH01M8/04303H01M8/04298H01M8/04067H01M8/04111H01M8/04201Y02E60/50
Inventor 李昌泉郝义国魏永琪
Owner WUHAN GROVE HYDROGEN AUTOMOBILE CO LTD