车用燃料电池堆低温停机吹扫试验研究

doi:10.19562/j.chinasae.qcgc.2023.11.013

Abstract

Abstract:

Gas purging during shutdown is an important method for proton exchange membrane fuel cells to ensure the safe storage and normal cold start in a low temperature environment. In order to achieve the quick shutdown purging， and meet the requirement of -40 ℃ non-destructive storage and cold start， relevant research is carried out in this paper. Firstly， a water balance model is established to analyze the generation and removal of water during the purge process. Secondly， the sensitivity analysis of the main parameters of shutdown purge is carried out， and it is determined that the cell temperature is a strong sensitive parameter， the humidification temperature is a medium sensitive parameter， and the gas flow is a weak sensitive parameter. Thirdly， 30 freezing/thawing cycles at -40 ℃/60 ℃ are carried out on the purge results， and the physical morphology and electrochemical analysis of the fuel cell after the test are carried out. Finally， the -40 ℃ cold start is carried out to verify whether the purging results can meet the requirements of -40 ℃ start-up. The results show that the low temperature purge time during shutdown is greatly shortened by optimizing the purging parameters. The performance of the fuel cell stack does not degrade and the physical morphology does not change significantly after storage at -40 ℃， and the fuel cell stack can achieve cold start at -40 ℃.

Key words: proton exchange membrane fuel cell, shutdown purge, -40 ℃ storage, cold start

Lü Ping,Xin Sun,Youwei Xu,Bao Zhang,Jiahui Xu,Danmin Xing. An Experimental Study on Low Temperature Shutdown and Purging of Vehicle Fuel Cell Stack[J].Automotive Engineering, 2023, 45(11): 2123-2129.

Figures/Tables 11

References 17

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An Experimental Study on Low Temperature Shutdown and Purging of Vehicle Fuel Cell Stack

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序号	载荷/A	电池温度/℃	气体流量/ （L·min^-1）	增湿温度/℃
1	30	45	3 800	20
		50		20
		55		25
		60		30
		65		35
		70		35
2	30	60	2 600	20
			3 200	20
			3 800	25
			4 400	30
			5 000	35