山东电力技术2024，Vol.51Issue(7)：45-51,7.DOI:10.20097/j.cnki.issn1007-9904.2024.07.006
基于充电曲线转换的串联锂离子电池组一致性诊断方法研究
A Consistency Diagnosis Method of Series-connected Lithium-ion Batteries Based on Charging Curve Transformation
摘要
Abstract
Due to the widespread use of energy storage systems in new energy grid-connected,lithium-ion batteries are usually used in parallel and series connections to meet the power and energy requirements of system.However,the series-connected single battery are inconsistent,so capacity and state of charge(SOC)inconsistency is an inevitable problem,which can decrease the available capacity and result in accelerated aging and safety issues.In this paper,a consistency diagnosis method based on charging curve transformation was proposed,and capacity and SOC differences within the battery pack was diagnosed.Focusing on the problem that traditional curve transformation method had a high data storage and computational requirement to battery management system,a QV curve transformation model based on curve transformation method was proposed.The consistency diagnosis for the series-connected battery pack is realized in real-time by parameter identification.Finally,through the analysis of a battery pack with six cells connected in series,the accuracy of the proposed method is verified,and the experimental results indicate that the proposed method can realize both capacity inconsistency and SOC inconsistency diagnosis.关键词
锂离子电池/荷电状态/一致性诊断/电池管理Key words
lithium-ion battery/state of charge/inconsistency diagnosis/battery management分类
信息技术与安全科学引用本文复制引用
吕炳霖,刘勇超,张佳云,田晓,李文芳..基于充电曲线转换的串联锂离子电池组一致性诊断方法研究[J].山东电力技术,2024,51(7):45-51,7.基金项目
国网山东营销服务中心群众性创新项目(520633230011). Mass Innovation Project of State Grid Shandong Electric Power Company Marketing Service Center(520633230011). （520633230011）
