Abstract An overcharge model of lithium ion battery pack was built by coupling the electrochemical model with thermal abuse model. The pack consists of three fully-charged batteries, each of which has a capacity of 10 Ah, using Li[Ni1/3Co1/3Mn1/3]O2 as the positive electrode. The three batteries in the pack were juxtaposed, and only the middle one was overcharged. The influences of current, convection coefficient and gap between batteries on the thermal runaway propagation were studied. The results of temperature and voltage obtained from the models were validated experimentally, and they were agreed well with the experimental data with the relative error within 6%. The results showed that the onset temperature of thermal runaway of the charged battery increased with an increase in the current, while the temperatures for the other two decreased. The temperature rate of the charged battery changed little when the convection coefficient was greater than 40 W/m2 K. The clamp of lithium ion battery pack had an important effect on the thermal runaway propagation. The occurrence of thermal runaway propagation was depended on whether there was the existence of clamp when the battery gap exceeded 5 mm.

中文翻译：

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锂离子电池组过充电热行为数学模型

摘要 通过电化学模型与热滥用模型的耦合，建立了锂离子电池组的过充电模型。该电池组由三个充满电的电池组成，每个电池的容量为 10 Ah，使用 Li[Ni1/3Co1/3Mn1/3]O2 作为正极。包中的三块电池并列放置，只有中间的一块过充。研究了电流、对流系数和电池间隙对热失控传播的影响。模型得到的温度和电压结果经过实验验证，与实验数据吻合较好，相对误差在6%以内。结果表明，充电电池的热失控起始温度随着电流的增加而升高，而另外两个的温度则降低。当对流系数大于 40 W/m2 K 时，充电电池的温度变化很小。锂离子电池组的夹具对热失控传播有重要影响。热失控传播的发生取决于电池间隙超过5 mm时是否存在夹子。