摘要
大倍率充电会引起储能电池负极析锂,进一步可能会诱发电池热失控并导致安全事故。而析锂副反应与电池负极电位直接相关,通过模型精确预测负极电位,传输至储能电池管理系统调整充电工况,可以有效抑制负极析锂。因此,文中提出一种基于降维机理简化伪二维(simplified pseudo two-dimensional,SP2D)模型的储能电池安全充电在线控制技术。首先,对伪二维(pseudo two-dimensional,P2D)模型中部分偏微分方程进行降维简化,建立SP2D模型,同时采用不同的方法获取相应的模型参数。其次,使用实验数据的端电压和负极电位对模型进行验证,结果表明模型在不同倍率恒流工况下精度较高。再次,基于SP2D模型结合比例控制器开展电池无析锂安全充电的仿真工作,结果表明,电池经过1895 s充电即达到截止电压4.3 V,且充电过程中负极电位均处于无析锂安全电位区间。最后,对仿真得到的充电策略进行循环和拆解验证,结果表明提出的充电方法能够实现电池无析锂安全充电。
High rate charging will cause lithium precipitation at the negative electrode of the energy storage battery,which may induce thermal runaway of the battery and lead to safety accidents.The lithium precipitation side reaction is directly related to the negative electrode potential of the battery,and the negative electrode potential can be accurately predicted by the model and transmitted to the energy storage battery management system to adjust the charging conditions,which can effectively suppress the negative electrode lithium precipitation.Therefore,an on-line control technology is proposed for safe charging of energy storage batteries based on the simplified pseudo two-dimensional(SP2D)model.Firstly,some partial differential equations in the pseudo two-dimensional(P2D)model are reduced and simplified to establish the SP2D model.Different methods are also used to obtain the corresponding model parameters.Secondly,the model is validated using experimental data of terminal voltage and negative potential,and the validation results show that the model has high accuracy under different multiplier constant current conditions.The results show that the battery reaches the cutoff voltage of 4.3 V after 1895 s charging,and the negative potential is in the range of lithium-free safety potential during the charging process.Finally,the simulated charging strategy is verified by cycling and disassembling,and the results show that the proposed charging method can realize the safe charging of the battery without lithium precipitation.
作者
钱广俊
王鲁彦
欧阳明高
卢宇芳
卢兰光
韩雪冰
QIAN Guangjun;WANG Luyan;OUYANG Minggao;LU Yufang;LU Languang;HAN Xuebing(Tsinghua University(State Key Laboratory of Automotive Safety and Energy),Beijing 100084,China)
出处
《电力工程技术》
北大核心
2024年第1期2-10,共9页
Electric Power Engineering Technology
基金
国家自然科学基金资助项目(52177217)
北京市自然科学基金资助项目(3212031)。
关键词
储能电池
负极电位
析锂
简化伪二维(SP2D)模型
比例控制器
安全充电
energy storage battery
negative electrode potential
lithium precipitation
simplified pseudo two-dimensional(SP2D)model
proportional controller
safe charging
