Design method of fuel cell sealing structure taking safe leakage rate as target
A sealing structure, fuel cell technology, applied in fuel cells, fuel cell control, fuel cell additives, etc., can solve problems such as the inability to consider the particularity of PEMFC sealing design
Pending Publication Date: 2021-01-22
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology
These methods are actually unable to consider the particularity of PEMFC seal design
Method used
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[0102] The specific implementation steps include:
[0103] ①Consider the following design parameters: the size of the sealing ring of a proton fuel cell is L×B×t, and the size of the intermediate membrane electrode is L m ×B m , the nominal gap height h 0 (It can be taken as 3 to 5 times the statistical roughness of the metal bipolar plate), medium flow viscosity coefficient μ, internal pressure p 1 and ambient pressure p 0 .
[0104] ②Substitute the above conditions into the Poiseuille flow formula to calculate the leakage Q of no compression and smooth interface p .
[0105] ③ Measure the composite roughness σ and the autocorrelation scale T of the flange surface and the sealing ring surface, and substitute it into the roughness factor formula to get Φ σ .
[0106] ④ According to the initial compressibility ε of the sealing structure 0 , calculate the initial sealing force F, and obtain the initial average contact stress S G0 . Actual average contact stress S G fo...
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Abstract
The invention discloses a fuel cell sealing structure design method taking a safe leakage rate as a target. The evaluation standard of the effectiveness of a sealing structure is that the leakage ratecan be controlled within an allowable range for a long time. The bottleneck of quantitative calculation of the leakage rate is broken through, so a design method taking the safe leakage rate as a target can be realized, and the situation that the PEMFC sealing structure design can only be qualitative and cannot be quantitative is fundamentally changed. According to the method, various factors influencing the leakage rate are comprehensively contained, the leakage rates corresponding to different design parameters can be conveniently analyzed by applying the model, and the method has good guiding significance for parameter selection and optimization design of the sealing structure. Therefore, the design method provided by the invention can well analyze the change of the leakage rate alongwith the working condition, can also analyze the service life, and is very suitable for the design of the PEMFC sealing structure with special requirements.
Description
technical field [0001] The invention relates to the technical field of fuel cells, in particular to a fuel cell sealing structure design method targeting at a safe leakage rate. Background technique [0002] Fuel cells use electrochemical reactions to convert the chemical energy of fuel and oxidant directly into electrical energy. Compared with traditional thermal conversion energy systems, fuel cells have the characteristics of high efficiency, zero pollution and low noise. In particular, the proton exchange membrane fuel cell (PEMFC), which operates at room temperature, has become a research hotspot in the fields of electric vehicles, mobile power supplies, and small power stations. [0003] as attached figure 1 As shown, a typical proton exchange membrane single cell includes components such as bipolar plates, diffusion layers, and membrane electrodes. The fuel gas and oxidant are transported to the adjacent diffusion layer through the bipolar plate flow channels on bo...
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IPC IPC(8): G06F30/23G06F30/20H01M8/04298H01M8/04992G06F119/14G06F113/08
CPCG06F30/23G06F30/20H01M8/04305H01M8/04992G06F2119/14G06F2113/08Y02E60/50
Inventor 黄晓明刘水熊加壮章旺许国良涂正凯
Owner HUAZHONG UNIV OF SCI & TECH