Detailed modeling investigation of thermal runaway pathways of a lithium iron phosphate battery,International Journal of Energy Research

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Detailed modeling investigation of thermal runaway pathways of a lithium iron phosphate battery
International Journal of Energy Research ( IF 4.3 ) Pub Date : 2021-09-12 , DOI: 10.1002/er.7235
Eunji Kwak _{1,

2} , Jun‐hyeong Kim _{1,

2} , Sung Ho Hong ₃ , Ki‐Yong Oh _{1,

2}

Affiliation

This study investigates the thermal runaway (TR) pathways of a lithium iron phosphate (LFP) battery to establish important considerations for its operation and design. A multiphysics TR model was developed by accounting for several phenomena, such as the chemical reaction degradation of each component, thermodynamics, and aging. The parameters used in the model were experimentally optimized under two scenarios, and TR pathways were subsequently characterized under the electric and thermal abuse conditions. In the electric abuse condition, the onset time and peak temperature are important metrics representing TR hazards because they are strongly correlated with the TR pathways subjected to the heat balance between internal heat generation and heat exchange with the environment. The surface-to-volume ratio (S/V) was identified as the most important metric for ensuring thermal safety, as it results in delayed TR with higher S/V under the electric abuse condition and accelerated TR under the thermal abuse condition. From both operational and design perspectives, this contradiction should be carefully considered. Moreover, with regard to aging, TR pathways varied under the electric and thermal abuse conditions. Aging only affected the peak temperature of the TR pathways under the electric abuse condition, whereas it only altered the onset temperature of TR pathways under the thermal abuse condition. This difference can be attributed to the different heat sources and heat balance mechanisms. Thus, understanding the dependency of TR under the electric and thermal abuse conditions on aging and cooling is important for the optimal design of LFP cells with high thermal stability and for establishing novel thermal management strategies. This intensive investigation can contribute toward ensuring thermal stability and reliability of LFP batteries from various perspectives.

中文翻译：

磷酸铁锂电池热失控路径的详细建模研究

本研究调查了磷酸铁锂 (LFP) 电池的热失控 (TR) 途径，以确定其运行和设计的重要考虑因素。多物理场 TR 模型是通过考虑多种现象开发的，例如每个组件的化学反应降解、热力学和老化。模型中使用的参数在两种情况下进行了实验优化，随后在电和热滥用条件下对 TR 通路进行了表征。在电滥用条件下，开始时间和峰值温度是代表 TR 危害的重要指标，因为它们与受内部热量产生和与环境热交换之间的热平衡的 TR 路径密切相关。表面体积比 (S/V) 被认为是确保热安全性的最重要指标，因为它导致在电滥用条件下具有更高 S/V 的延迟 TR 和在热滥用条件下加速 TR。从操作和设计的角度来看，应该仔细考虑这个矛盾。此外，关于老化，TR 通路在电和热滥用条件下发生变化。老化仅影响电滥用条件下TR通路的峰值温度，而仅改变热滥用条件下TR通路的起始温度。这种差异可归因于不同的热源和热平衡机制。因此，了解 TR 在电气和热滥用条件下对老化和冷却的依赖性对于优化设计具有高热稳定性的 LFP 电池和建立新的热管理策略非常重要。这项深入研究有助于从各个角度确保 LFP 电池的热稳定性和可靠性。

更新日期：2021-09-12

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