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Study on thermomechanical coupling characteristics of embedded sensor lithium batteries under low‐temperature environment
Author(s) -
Chen XianTao,
Wang ChunXiao,
Sun Qiang,
Wang Haibin,
Xie Song,
He YuanHua
Publication year - 2020
Publication title -
energy storage
Language(s) - English
Resource type - Journals
ISSN - 2578-4862
DOI - 10.1002/est2.107
Subject(s) - battery (electricity) , materials science , strain (injury) , electrode , coupling (piping) , lithium (medication) , composite material , lithium ion battery , thermodynamics , chemistry , medicine , power (physics) , physics , endocrinology
Aircraft usually undergoes a low temperature during flight. It is crucial to understand the strain generation mechanism within lithium‐ion batteries in low temperature to prevent electrode rupture caused by uneven strain of the cell. As such, LFP pouch cell was chosen as experimental objects and the sensors were embedded inside the battery to get the internal parameters directly. Battery cycle experiments were conducted in a 2 m × 2 m × 2 m cabin in, respectively, 25°C, 10°C, −10°C, −20°C ambient temperatures with high C rates of 3C during the charge‐discharge process, which is to simulate the aircraft flying process in low temperatures at different altitudes. Parameters such as voltage, internal temperature, and strain were measured. The results revealed the significant impact on thermomechanical coupling characteristics of LFP battery caused by low temperature. As the ambient temperature decreases, the maximum strain increases. The strain is positively correlated with the temperature of the battery, and as the ambient temperature decreases, battery temperature would have more effects on strain. Besides, it was also found that in a low‐temperature environment, the heat generated by the battery itself is beneficial to its performance recovery.