【Applied Energy】基于内部温度的三元电池热失控连锁反应测定与机理模型建立

AEii国际应用能源 · 公众号 · · 2023-11-28 18:30

正文

原文信息：

Thermal runaway chain reaction determination and mechanism model establishment of NCA-graphite battery based on the internal temperature

原文链接：

https://www.sciencedirect.com/science/article/pii/S0306261923014617

Highlights

• The sequence of thermal runaway chain reaction of NCA battery based on internal temperature is determined.

• Six exothermic reactions are selected as the model heat sources.

• The optimal combination of kinetic parameters corresponding to each model heat source is identified.

• A thermal-kinetic thermal runaway model considering side reaction sequence and hierarchical properties is established.

• The quantification of each exothermic reaction in each stage of thermal runaway is realized by simulation.

摘要

电池内部温度的测量直接影响到热失控连锁反应顺序的确定和模型热源的选择，而各热源对应的动力学参数的优化组合识别是建立模型的前提。作者以内置热电偶的Li _x (Ni _0.8 Co _0.15 Al _0.05 )O ₂ -石墨袋电池为研究对象。根据热失控行为的阶段划分和电池组分间不可逆放热反应的解耦，确定了热失控机理。然后，结合不同加热速率下的 DSC 试验、基辛格方法和遗传算法，确定了动力学参数的最佳组合。此外，还建立了考虑分层特性的热失控模型，并量化了热失控各阶段六个放热反应的热贡献。在热失控前，阳极+电解质和阴极+阳极对热积累的贡献率分别为 53.8% 和 18.7%。内部短路占 27.5%，热量瞬间释放，直接引发热失控。本文对电池安全预警系统的设计和电池改造策略具有重要的参考意义。

更多关于"Lithium-ion battery"的研究请见： https://www.sciencedirect.com/search?pub=Applied%20Energy&cid=271429&qs=Lithium-ion%20battery

Abstr act

The measurement of battery internal temperature directly affects the determination of the sequence of thermal runaway chain reaction and the choice of model heat sources, and the optimal combination identification of kinetic parameters corresponding to each heat source is the premise of establishing model. This paper focuses on the Li _x (Ni _0.8 Co _0.15 Al _0.05 )O ₂ -graphite pouch battery with built-in thermocouple. Based on the stage division of thermal runaway behavior and the decoupling of irreversible exothermic reaction between battery components, the thermal runaway mechanism is determined. Then, the optimal combination of kinetic parameters is determined by combining the DSC tests under variant heating rates, the Kissinger's method and the genetic algorithm. Furthermore, a thermal runaway model considering hierarchical properties is established, and the thermal contribution of six exothermic reactions at each stage of thermal runaway is quantified. Anode+electrolyte and cathode+anode contribute 53.8% and 18.7% respectively to the heat accumulation before thermal runaway. Internal short circuit accounts for 27.5%, and the heat is released instantaneously, directly triggering thermal runaway. This work has important reference significance for the design of battery safety warning system and the battery modification strategy.

Keywords

Thermal runaway chain reaction

Mechanism model

Kinetic parameters

Internal temperature

Thermal contribution

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