Electric pile water management regulation and control method and device based on fixed-frequency impedance and gas pressure drop

A high-frequency impedance, stack technology, applied in the field of stack water management and regulation, to solve the effect of inaccurate diagnosis

Pending Publication Date: 2021-12-10
北京格睿能源科技有限公司
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  • Electric pile water management regulation and control method and device based on fixed-frequency impedance and gas pressure drop
  • Electric pile water management regulation and control method and device based on fixed-frequency impedance and gas pressure drop
  • Electric pile water management regulation and control method and device based on fixed-frequency impedance and gas pressure drop

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[0029] Embodiments of the present invention will be described in detail below, and examples of the embodiments are illustrated in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions. The embodiments described below are illustrative of the invention, and is intended to be construed as limiting the invention.

[0030] The fuel cell system is first elaborated before the exemplary frequency pilot management regulation method and apparatus proposed by the exemplary embodiment of the present invention. figure 1 As shown, the fuel cell system includes a stack, an air subsystem, a hydrogen subsystem, a thermal management subsystem, and a voltage conversion device. The electric stack contains a CVM voltage inspection device; the voltage conversion device is mainly DCDC, in addition to having an improved DC voltage function, can also periodically supply high frequency voltage incentives; air su...

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Abstract

The invention discloses an electric pile water management regulation and control method and device based on fixed-frequency impedance and gas pressure drop. The method comprises the following steps: periodically applying a fixed high-frequency AC voltage through DCDC to excite an electric pile of a fuel cell, so as to measure the high-frequency impedance of the electric pile; judging whether the high-frequency impedance is greater than a film dry threshold; and if the pressure value is greater than the membrane dry threshold value, judging that the fuel cell is in a membrane dry state, otherwise, collecting the pressure value of the reaction gas of the fuel cell, and judging that the fuel cell is in a flooding state when the pressure value is greater than the flooding threshold value so as to monitor the current state of the fuel cell on line. The method can realize accurate diagnosis of membrane dryness and water logging, can be applied online in real time, and is simple and easy to realize.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a stack water management and regulation method and device based on constant frequency impedance and gas pressure drop. Background technique [0002] Proton exchange membrane fuel cells are widely favored in the fields of new energy locomotives, trams, automobiles, portable power supplies and distributed power generation due to their high energy conversion rate, no pollution, fast start-up speed, and low operating temperature. However, the short lifespan and poor stability of PEMFC currently hinder the large-scale commercial promotion and application of PEMFC. Especially with the increase of PEMFC power, water flooding and membrane dry failures are more likely to occur, resulting in reduced durability of the system, affected work performance, and even shortened remaining life. Accurately revealing the mechanism of PEMFC water flooding and membrane dry faults, effectively diagn...

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Application Information

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IPC IPC(8): H01M8/04291H01M8/0438H01M8/04537
CPCH01M8/04291H01M8/04649H01M8/04388H01M8/04395Y02E60/50
Inventor 徐晓明洪吉超赤骋陈东方胡松王越李跃华李仁政赵磊唐伟孙旭东仝光耀袁秋奇
Owner 北京格睿能源科技有限公司
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