基于伪参比电极的锂离子电池正负极相对开路电势曲线测量方法研究  

Research on Measurement Method for Relative Open-Circuit Potential Curves of Lithium-Ion Battery Electrodes Based on aPseudo-Reference Electrode

作　　者：李泊言 金锋[1,2] 冬雷[1,2] 张睿思 赵贺明 张宇 LI Boyan;JIN Feng;DONG Lei;ZHANG Ruisi;ZHAO Heming;ZHANG Yu(School of Automation,Beijing Institute of Technology,Beijing 100081,China;Tangshan Research Institute,Beijing Institute of Technology,Tangshan 063000,China;Tangshan Mining Branch,Kailuan(Group)Co.,Ltd.,Tangshan 063000,China)

机构地区：[1]北京理工大学自动化学院,北京100081 [2]北京理工大学唐山研究院,河北唐山063000 [3]开滦(集团)有限责任公司唐山矿业分公司,河北唐山063000

出　　处：《电机与控制应用》2024年第9期24-32,共9页Electric machines & control application

基　　金：天津市科委重点研发计划项目(18YFFCTG00040)。

摘　　要：用于获取锂离子电池正负极开路电势曲线的纽扣电池试验需要对电池进行破坏性拆解,而且试验过程中电池极易受到污染。为解决此问题,提出了一种利用伪参比电极获取锂离子电池正负极相对开路电势曲线的方法。该方法将锂电池外壳作为参比电极,通过小倍率充放电试验直接测得电极与外壳之间的相对开路电势。通过商用钛酸锂电池对所提方法进行试验验证,结果表明利用所提方法计算得到的电池电压和实际测量的电池电压的均方根误差仅为4.2 mV,且在同批次电池上辨识得到的热力学参数随电池容量衰减而减小。试验结果验证了伪参比电极法可在不破坏电池的情况下获取到可信度较高的相对开路电势曲线。A button cell test used to obtain the open-circuit potential(OCP)curves of lithium-ion battery electrodes requires destructive disassembly of the battery,and the battery is highly susceptible to contamination during the process.To address this issue,a method utilizing a pseudo-reference electrode to acquire the relative OCP curves of the electrodes of lithium-ion batteries was proposed.In this method,the lithium battery casing was used as a reference electrode,and the relative OCP between the electrode and the casing was directly measured through low-rate charge-discharge tests.The method was experimentally validated using commercial lithium titanate batteries,and the results showed that the root mean square error(RMSE)between the calculated and the actual measured battery voltages was only 4.2 mV.Moreover,the thermodynamic parameters identified from the same batch of batteries decreased as the battery capacity decayed.The experimental results confirm that the pseudo-reference electrode method can obtain reliable relative OCP curves without damaging the battery.

关 键 词：锂离子电池 参比电极 开路电势曲线 参数辨识 

分 类 号：TM912[电气工程—电力电子与电力传动]