期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 143, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2019.118576
关键词
Lithium-ion battery; Heat generation behaviors; Transient thermal characteristics; Longitudinal airflow
资金
- National Natural Science Foundation of China [51676150]
- Key Science Research Innovation Team Project of Shaanxi Province [2016KCT-16]
- National Key Research & Development Program of China [2016YFC0802405]
The thermal characteristics of lithium-ion battery affect significantly charging/discharging performance, cycle life and safety of electric vehicles (EVs) battery packs. In this study, a stagger-arranged battery pack consisting of three battery modules was developed to explore its transient thermal characteristics in charging/discharging process under the two cooling strategies, i.e., natural cooling and forced air cooling. The investigation of heat generation behavior of the battery with Li(NixCoyAl2)O-2 cathode showed that the heat generation rate of the battery remains almost unchanged along the main discharging process, while a rapid increase in heat production is detected at the end of discharging. It was found that the maximum temperature and temperature difference in the battery pack subject to a moderate charging/discharging rate, e.g., 0.5 C, can be maintained within the desirable ranges by natural cooling. The forced air cooling strategy employing longitudinal airflow remarkably improves the battery's transient thermal characteristics with achieving the depth of discharge (DOD) up to 84.2%, which is capable to prolong the battery pack's cycle life to a large extent. Lastly, the appropriate air supply velocity of 0.8 m.s(-1) is recommended for the proposed battery pack subject to a higher discharging rate, e.g., 1 C, from the viewpoint of cooling effectiveness. (C) 2019 Elsevier Ltd. All rights reserved.
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