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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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  • Claims
  • Application Information

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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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Embodiment Construction

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0030] Before introducing the stack water management control method and device based on constant frequency impedance and gas pressure drop proposed by the embodiment of the present invention, the fuel cell system will be described first, as shown in figure 1 As shown, the fuel cell system includes an electric stack, an air subsystem, a hydrogen subsystem, a thermal management subsystem, and a voltage conversion device. The electric stack includes a CVM voltage inspection device; the voltage conversion device is mainly DCDC, which...

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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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