Early monitoring and warning of overcharge thermal runaway in lithium-ion battery under various charging methods

IF 6.1 2区 工程技术 Q2 ENERGY & FUELS
Teng Jia , Ziyao Zeng , Hang Yu , Chuyuan Ma , Junxin Huang
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Abstract

In order to advance the early warning time window for overcharge-induced thermal runaway in lithium-ion batteries and enhance the accuracy and real-time monitoring of battery safety status, a novel early warning model for overcharge-induced thermal runaway is proposed. Experiments were conducted on the thermal runaway behavior of ternary lithium-ion batteries under various overcharging rates, the effects of constant current constant voltage (CC-CV) overcharge and constant current (CC) overcharge on the thermal runaway behavior of lithium-ion batteries were compared. The results indicate that the internal temperature during CC overcharging is higher than that during CC-CV overcharging. Under the CC-CV charging mode, the temperature differences between the internal and external maximum temperatures at 0.5 C and 7 C overcharges are 55 °C and 29.5 °C, respectively. Under the CC charging mode, the maximum temperature differences between the inside and outside of the battery at 0.5 C and 7 C overcharges reach 75.2 °C and 66.1 °C, respectively. Notably, high-rate CC overcharging (5 C, 7 C) can trigger the opening of the battery’s pressure relief valve, with the maximum internal temperature reaching 115 °C. The characteristic parameters of thermal runaway caused by CC charging were extracted, and a two-level early warning model for overcharge-induced thermal runaway in lithium-ion batteries was established, leveraging the multi-parameter coupling of external temperature, temperature rise rate, and voltage.
不同充电方式下锂离子电池过充热失控的早期监测与预警
为了提高锂离子电池过充热失控的预警时间窗,提高电池安全状态监测的准确性和实时性,提出了一种新的过充热失控预警模型。实验研究了不同过充电率下三元锂离子电池的热失控行为,比较了恒流恒压过充电和恒流过充电对锂离子电池热失控行为的影响。结果表明,CC过充电时的内部温度高于CC- cv过充电时的内部温度。在CC-CV充电模式下,0.5 C和7 C过充电时,内外最高温度的温差分别为55°C和29.5°C。CC充电模式下,0.5℃过充和7℃过充时电池内外最大温差分别达到75.2℃和66.1℃。值得注意的是,高倍率CC过充(5℃、7℃)会触发电池的泄压阀打开,内部温度最高可达115℃。提取了CC充电引起的过充热失控特征参数,利用外部温度、温升速率、电压等多参数耦合,建立了锂离子电池过充热失控两级预警模型。
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来源期刊
Applied Thermal Engineering
Applied Thermal Engineering 工程技术-工程:机械
CiteScore
11.30
自引率
15.60%
发文量
1474
审稿时长
57 days
期刊介绍: Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.
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