电池(电)
电化学
材料科学
锂(药物)
热的
离子
锂离子电池
分析化学(期刊)
热力学
核工程
化学
电极
功率(物理)
物理化学
医学
物理
有机化学
色谱法
工程类
内分泌学
作者
Tong Ren,Zhengyu Mao,Lijun Chang,Wanyu Chen,Jingyi Xu,Yan Zhang,Taiwei Chen,Zhihua Cai
标识
DOI:10.1002/ente.202300826
摘要
As the capacity of lithium‐ion batteries decays severely at low temperatures, it is important to study the electrochemical and thermal properties of lithium‐ion batteries at low temperatures. Herein, a large‐capacity prismatic lithium‐ion battery is selected to carry out experiments to study the electrothermal characteristics of the battery in different temperatures (25, 0, −10, and −20 °C). Second, a pseudo‐3D electrochemical–thermal coupling model is established and the validity of the model is verified. Finally, this article analyzes the influence of ambient temperature on the thermal characteristics of the battery during discharge. The results show that the battery discharge capacity gradually decreases with the decrease in the ambient temperature. At −20 °C, the discharged electricity is 66.51% of that at room temperature. At the same time, as the ambient temperature drops, the temperature rise on the surface of the battery increases during the discharge process, and at −20 °C, the temperature rise can reach 3.86 times than that at normal temperature. In addition, the change in reversible heat percentage is negatively correlated with the discharge rate and positively correlated with the battery temperature, while the effect of the discharge rate on irreversible heat is greater than that of ambient temperature.
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