Investigating the thermal runaway features of lithium-ion batteries using a thermal resistance network model
Investigating the thermal runaway features of lithium-ion batteries using a thermal resistance network model
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DOI：
10.1016/j.apenergy.2021.117038
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发表时间：
2021-08
期刊：
影响因子：
11.2
通讯作者：
Jie Chen;Dongsheng Ren;Hungjen Hsu;Li Wang;Xiangming He;Caiping Zhang;Xuning Feng;M. Ouyang
中科院分区：
文献类型：
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作者：
Jie Chen;Dongsheng Ren;Hungjen Hsu;Li Wang;Xiangming He;Caiping Zhang;Xuning Feng;M. Ouyang
热失控的特征温度受多种因素的影响，准确测量其温度对电池安全性评价具有重要意义。本文建立了一维热阻网络模型，研究了各种因素对锂离子电池热失控特性的影响。在模型中，电池在厚度方向上被划分为四个独立的组件，用热阻连接不同的节点。加入气体热阻来模拟电池的膨胀和破裂。该模型能有效拟合电池在绝热失控和烘箱试验条件下的热失控行为。基于模型的分析表明，测试条件、热电偶位置和电池厚度对热失控特征和特征温度有显著影响。烘箱试验的热失控起始温度（T2）比绝热失控试验低48.1℃。不同位置的测量值不同，当电池厚度增加到10 cm时，测量值差异可超过20%。此外，表面的最高热失控温度（T3）约为其他位置的一半。最后，提出了合理放置热电偶的建议，为准确评估电池热失控性能提供了有益的指导。
Accurate measurement of the characteristic temperatures of thermal runaway, which are affected by many factors, is important for battery safety evaluation. A one-dimensional thermal resistance network model is built in this study to investigate the influences of various factors on the thermal runaway features of lithium-ion batteries. In the model, the battery is divided into four independent components in the thickness direction, with thermal resistances connecting different nodes. The gas thermal resistance is added to simulate swelling and rupture of the battery. The model can effectively fit the battery thermal runaway behavior under both adiabatic thermal runaway and oven test conditions. Model-based analyses show that the thermal runaway features and characteristic temperatures are significantly affected by the test conditions, thermocouple positions, and battery thickness. The onset temperature of thermal runaway (T2) obtained in the oven test is 48.1 °C lower than that obtained in the adiabatic thermal runaway test. The measuredT2varies at different positions, and the difference can exceed 20% when the battery thickness increases to 10 cm. Moreover, the maximum thermal runaway temperature (T3) at the surface is approximately half that at the other positions. Finally, several suggestions for reasonable thermocouple placement are proposed, which can provide useful guidance for accurately evaluating battery thermal runaway performance.