Fuel cell purging control method and device based on DRT analysis

A fuel cell and control method technology, applied in fuel cells, fuel cell additives, fuel cell heat exchange, etc., can solve problems such as poor purging effect, improve cold start performance, reduce icing risk, and improve durability Effects on sex and longevity

Active Publication Date: 2022-04-12
BEIJING SINOHYTEC
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention discloses a fuel cell purging control method based on DRT analysis, which is used to solve the technical problem of poor purging effect when the fuel cell system shuts down in the prior art

Method used

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  • Fuel cell purging control method and device based on DRT analysis
  • Fuel cell purging control method and device based on DRT analysis
  • Fuel cell purging control method and device based on DRT analysis

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Embodiment Construction

[0049] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0050]As used herein, the term "comprise" and its variants mean open inclusion, ie "including but not limited to". The term "or" means "and / or" unless otherwise stated. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one further embodiment". The terms "first", "second", etc. may refer to different or the same o...

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Abstract

The invention provides a fuel cell purging control method and device based on DRT analysis, and the method comprises the steps: carrying out the DRT analysis of an electrochemical impedance spectrum of a fuel cell system in a cold storage state after the fuel cell system is shut down, and obtaining the low-frequency impedance, second intermediate-frequency impedance and second high-frequency impedance of the fuel cell system; correcting the first impedance target value and the second impedance target value according to the low-frequency impedance, the second intermediate-frequency impedance and the second high-frequency impedance, and determining a new first impedance target value and a new second impedance target value; and storing the new first impedance target value and the new second impedance target value, so as to purge the fuel cell system according to the new first impedance target value and the new second impedance target value before the next shutdown, thereby realizing the dynamic closed loop of the cold purge of the fuel cell based on the optimized purge criterion, reducing the freezing risk of cold storage, and improving the reliability of the fuel cell system. Meanwhile, the cold start performance of the stack is improved, and the durability and service life of the fuel cell are improved.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell purge control method and device based on DRT analysis. Background technique [0002] After the fuel cell system is shut down, the generated water and humidified water may remain in the system during operation, which is not conducive to the next startup, especially when the ambient temperature drops below zero during the shutdown, the internal water may freeze, resulting in Parts, runners, diffusion layers, etc. freeze, causing start-up failures and component damage, so purge operations are often performed during shutdowns. [0003] Most of the purging methods in the prior art are simple purging. Some purging strategies only consider the high-frequency impedance of the fuel cell to achieve closed-loop purging, and do not monitor the internal impedance of the stack during the cold storage period, resulting in blowing Incomplete sweeping increases the risk of the sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/04223H01M8/04228H01M8/04303H01M8/04537H01M8/04014
CPCY02E60/50
Inventor 李飞强张国强苗田伟赵兴旺
Owner BEIJING SINOHYTEC
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