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To enhance the accuracy and reliability of estimating the State Of Charge (SOC) for lithium-ion power batteries, a representative Thevenin model for lithium batteries is selected for study. The modeling and parameter identification methods for this model are elaborated. By analyzing the main limitations of existing SOC estimation techniques, a novel method based on the Thevenin equivalent circuit model combined with an unscented Kalman filter (UKF) is proposed. Verification results demonstrate that this method exhibits good tracking performance, maintains errors within an acceptable range, and delivers overall excellent performance.
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为了提高锂离子动力电池荷电状态(SOC)的估计精度和可靠性,选取具有代表性的锂电池戴维宁(Thevenin)模型作为研究对象,阐述了该模型的建模和参数辨识方法,通过对现有SOC估计方法主要局限性进行分析,提出了一种基于Thevenin等效电路模型和无迹卡尔曼滤波(UKF)的SOC估计方法。验证结果表明,该方法跟踪效果良好,误差在可接受范围内,整体性能优良。
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电动汽车用电池管理系统技术条件:GB/T 38661—2020[S/OL]. (2020-10-01)[2024-12-01]. https://openstd.same.gov.cn/bzgk/gb/newGblnfo?hcno=DB3ACC49AC4AC4A146FAA311BB468ACA290., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1190333117681472003, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, xref=null, ext=[AuthorCompanyExt(id=1190333117685666308, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, companyId=1190333117681472003, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=Zhuhai Guangtong Automobile Co., Ltd., Zhuhai 519090), AuthorCompanyExt(id=1190333117694054917, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, companyId=1190333117681472003, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=珠海广通汽车有限公司,珠海 519090)])], figs=[ArticleFig(id=1190333119828955676, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=EN, label=null, caption=null, figureFileSmall=v9jHVFRe8q+71zHodJsaUw==, figureFileBig=tku3RYZvYxKiEKprnn5Lxw==, tableContent=null), ArticleFig(id=1190333119900258845, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=CN, label=图1, caption=
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戴维宁模型结构示意, figureFileSmall=fRZvkL1QT+jRhDbEVTEwKg==, figureFileBig=o9Xc3UaErUFnJRPeI0KJKQ==, tableContent=null), ArticleFig(id=1190333120294523424, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=EN, label=null, caption=null, figureFileSmall=czXZbfngfLy11DYejtvXKQ==, figureFileBig=yjwpzoytxhOJz0/YvpTw5Q==, tableContent=null), ArticleFig(id=1190333120386798113, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=CN, label=图3, caption=
PNGV模型结构示意, figureFileSmall=czXZbfngfLy11DYejtvXKQ==, figureFileBig=yjwpzoytxhOJz0/YvpTw5Q==, tableContent=null), ArticleFig(id=1190333120445518370, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=EN, label=null, caption=null, figureFileSmall=MY5YUPF2N+8tMf+72m4LsA==, figureFileBig=1f075jxw38dSiDd2BegHMg==, tableContent=null), ArticleFig(id=1190333120512627235, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=CN, label=图4, caption=
N阶RC模型结构示意, figureFileSmall=MY5YUPF2N+8tMf+72m4LsA==, figureFileBig=1f075jxw38dSiDd2BegHMg==, tableContent=null), ArticleFig(id=1190333120579736100, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=EN, label=null, caption=null, figureFileSmall=gBtOJGdn9Sc6Or/PUTfDuw==, figureFileBig=qGJFat7uW8Ct3VLzI7EIeg==, tableContent=null), ArticleFig(id=1190333120638456357, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=CN, label=图5, caption=
UKF估计值和真实值对比, figureFileSmall=gBtOJGdn9Sc6Or/PUTfDuw==, figureFileBig=qGJFat7uW8Ct3VLzI7EIeg==, tableContent=null), ArticleFig(id=1190333120701370918, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=EN, label=null, caption=null, figureFileSmall=JfZWc12OTl3dNFBOvxgAsA==, figureFileBig=zGpJmBRvpKHw+4oCWEmpeA==, tableContent=null), ArticleFig(id=1190333120785256999, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=CN, label=图6, caption=
SOC估计误差, figureFileSmall=JfZWc12OTl3dNFBOvxgAsA==, figureFileBig=zGpJmBRvpKHw+4oCWEmpeA==, tableContent=null), ArticleFig(id=1190333120864948776, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=EN, label=null, caption=null, figureFileSmall=null, figureFileBig=null, tableContent=
| 估计方法 | 基本原理 | 优点 | 局限性 |
| 放电法 | 恒流放电至截止电压 | 用于计量测定 | 需要离线测定,耗时较长 |
| 安时积分法 | 电流对时间的积分 | 计算简单、应用广泛 | 依赖于初始SOC,受温度和自放电等因素影响,累计误差无法消除 |
| 开路电压法 | 充分搁置,采用开路电压OCV-SOC曲线 | 计算简单、精度较高 | 测开路电压需要长时间搁置,耗时长,受温度、噪声影响 |
| EKF | 结合电池等效模型,使用预测、修正两环节 | 估计精度高,能实现实时预测修正功能 | 忽略高阶项、强制线性化易产生误差、计算量大 |
| UKF | 线性化处理机制效果改进 | 克服了EKF的局限性,精度高,可适用于复杂工况系统 | 算法相对复杂 |
| 神经网络法 | 模拟人脑工作机制 | 强非线性、自学习能力、精度高 | 依赖大量数据,且数据误差影响大 |
), ArticleFig(id=1190333120948834857, tenantId=1146029695717560320, journalId=1189645257101713411, articleId=1190332967827378233, language=CN, label=表1, caption=
现有SOC估计方法对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 估计方法 | 基本原理 | 优点 | 局限性 |
| 放电法 | 恒流放电至截止电压 | 用于计量测定 | 需要离线测定,耗时较长 |
| 安时积分法 | 电流对时间的积分 | 计算简单、应用广泛 | 依赖于初始SOC,受温度和自放电等因素影响,累计误差无法消除 |
| 开路电压法 | 充分搁置,采用开路电压OCV-SOC曲线 | 计算简单、精度较高 | 测开路电压需要长时间搁置,耗时长,受温度、噪声影响 |
| EKF | 结合电池等效模型,使用预测、修正两环节 | 估计精度高,能实现实时预测修正功能 | 忽略高阶项、强制线性化易产生误差、计算量大 |
| UKF | 线性化处理机制效果改进 | 克服了EKF的局限性,精度高,可适用于复杂工况系统 | 算法相对复杂 |
| 神经网络法 | 模拟人脑工作机制 | 强非线性、自学习能力、精度高 | 依赖大量数据,且数据误差影响大 |
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