目的 对电池工况电流进行控制,以防止电池发生析锂现象,保证电池的安全运行。方法 结合粒径尺寸效应影响,增加应力和产热描述,改进现有电化学模型,构建基于多粒径的电化学-热-力耦合模型。在此基础上,提出了各个粒径活性颗粒的表征析锂的负极过电势计算方程,并结合二分法提出无析锂电流边界在线估计方法。结果 构建的模型能够准确地对电池的外特性进行仿真,该模型的端电压平均绝对误差不超过20 mV,外壳温度平均绝对误差不高于0.2 ℃,以此实现了多温度、全荷电状态（SOC）范围的无析锂电流边界估计。结论 无析锂电流边界与电池温度和SOC密切相关,温度越低,SOC越高,不发生析锂的电流越小。
Abstract
The work aims to control the battery operating current and prevent lithium plating, thereby ensuring the safe operation of the battery. Considering the impact of size effect of particle, the description of stress and heat generation was highlighted to improve the existing electrochemical model, and construct a multi-particle-size coupled electro-chemo-ther- mal-mechanical model. On this basis, the calculation equations of negative electrode overpotential for characterizing lithium plating of active particles with different sizes were proposed, and combined with the bisection method, an online estimation method for the non-lithium-plating current boundary was developed. The model established in this work could accurately simulate the external characteristics of the battery. The mean absolute error (MAE) of the terminal voltage was less than 20 mV, and the MAE of the temperature was no more than 0.2 ℃, thus realizing the estimation of non-lithium-plating current boundary over a wide temperature range and the full state of charge (SOC) domain. The non-lithium-plating current boundary is closely related to battery temperature and SOC. The lower the temperature and the higher the SOC, the smaller the maximum current without lithium plating.
关键词
锂离子电池 /
电化学模型 /
温度估计 /
电流控制 /
析锂 /
负极过电势
Key words
lithium-ion batteries /
electrochemical model /
temperature estimation /
current control /
lithium plating /
negative electrode overpotential
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基金
南方电网有限责任公司科技项目（GDKJXM20230817）
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