期刊
APPLIED THERMAL ENGINEERING
卷 184, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2020.116291
关键词
Lithium ion battery; Thermal runaway propagation; Thermal management; Water mist; Cooling
资金
- Natural Science Foundation of China [51874265]
- Key national RD program [2018YFC0809500]
- University Synergy Innovation Program of Anhui Province [GXXT-2019-027]
The study investigates the cooling effect of water mist on thermal runaway propagation in lithium ion batteries, revealing that parallel connected battery modules can intensify the thermal runaway hazard, leading to enhanced heat transfer and decreased critical control temperature, thus reducing the cooling efficiency of water mist.
Water mist (WM) is an efficient cooling control strategy for thermal runaway (TR) propagation in lithium ion battery (LIB) modules, presenting potential for application in real systems. To comprehensively understand the cooling effect, WM is experimentally tested under significantly severe conditions, where LIB modules are connected in parallel and experience intensified TR propagation. Results show that 18650-type LIBs in the parallel connected module experience intensified TR hazard with higher propagation speeds. An extremely small voltage variation is detected during TR propagation, which leads to the negligible charge capacity. The enhanced heat transfer through pole connectors is demonstrated to be the major cause of the intensified TR propagation hazard. Batteries in the parallel connected module present much lower TR onset temperature, leading to a decreased critical control temperature. Once the critical control temperature reaches below 100 degrees C, the cooling process mainly depends on the sensible heat of water, and thus, the cooling efficiency of the WM is significantly weakened. The control mechanism is interpreted by qualitatively comparing the relationship between the battery heating rate and the WM cooling rate. The decreased critical control temperature and the enhanced heat transfer are identified as the main causes of the poor control effect.
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