Fuel cell electric performance and gas tightness attenuation under influence of enhanced road vibration spectrum

doi:10.19799/j.cnki.2095-4239.2020.0362

Abstract

Abstract:

The durability and reliability of vehicle fuel cells are key problems restricting the development of commercial fuel cells. Mostly, current fuel cell vibration tests refer to the vibrational spectrum of power batteries, which does not match those of fuel cell influence studies. Its influence mechanism is analyzed, and a novel testing program is designed. In this paper, the power density spectrum of a vibration bench is converted from a typical vehicle driving cycle through smoothing and degradation treatment. An intensified vibration test proceeded using a typical fuel cell stack. By choosing the remarkable influence direction, a 270 h endurance test is done to simulate the impact of a 30000 km actual drive cycle. During the test, an acoustic meter is used to confirm the amplifying effect of the shock absorber on vibration acceleration. After the test, the variation law of fuel cell electrical performance and the sealing property were analyzed through a polarization curve test, airtightness test, and other performance characterization methods. The research shows that long-term durability vibration attenuates fuel cell electrical performance. The inside proton exchange membrane and outer shell package of fuel cell decay to different degrees as well.

Key words: fuel cell, intensive vibrational spectrum, performance attenuation, gas tightness attenuation

CLC Number:

TM 911.42

Fenglai PEI, Yunhan OUYANG. Fuel cell electric performance and gas tightness attenuation under influence of enhanced road vibration spectrum[J]. Energy Storage Science and Technology, 2021, 10(2): 714-721.

Figures/Tables 17

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References 13

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性能测试试验	性能表征试验时间安排/h
气密性试验	0,30,60,90,120,150,180,210,240,270
极化曲线试验	0,30,60,90,120,150,180,210,240,270

名称	条件
氢气相对湿度/%	45～50
空气相对湿度/%	60
氢气计量数	1.8
空气计量数	2.5
氢气入口压力/kPa	80
空气入口压力/kPa	70
冷却水出口温度/℃	65～70

电流密度/ mA·cm^-2	运行时间/s
0	20
100	90
200	90
300	90
400	90
500	90
600	90
700	90
…
步进100 mA·cm^-2	90
…
Max	90

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