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A novel method to obtain the open circuit voltage for the state of charge of lithium ion batteries in electric vehicles by using H infinity filter

机译:利用H无穷大滤波器获得电动汽车锂离子电池充电状态开路电压的新方法

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摘要

The open circuit voltage (OCV) is an essential variable for accurate state of charge (SoC) estimation of lithium ion batteries in electric vehicles (EVs). OCV test must be performed periodically to calibrate the OCV-SoC relationship after battery aging. Furthermore, due to pronounced hysteresis effects and wide flat regions in the OCV-SoC curves of LiFePO4 batteries, the traditional OCV tests often take three to five days to obtain data on one or more fully charge and discharge cycles, which are time-consuming and become unreliable under changing driving cycles and operating conditions. In addition, the OCV-SoC relationship determined in a certain aging stage cannot be used for the full life cycle and whole operating conditions. In this paper, the OCV-SoC relationship is extracted from any existing current-voltage measurements by using an H infinity filter within several seconds, which is verified under constant current conditions and dynamic conditions. Our results show that the estimated OCV can result in accurate SoC estimation with a maximum error of 1%. (C) 2017 Elsevier Ltd. All rights reserved.
机译:开路电压(OCV)是电动汽车(EV)中锂离子电池准确充电状态(SoC)估算的基本变量。电池老化后,必须定期执行OCV测试以校准OCV-SoC关系。此外,由于明显的磁滞效应和LiFePO4电池的OCV-SoC曲线中的宽平坦区域,传统的OCV测试通常需要三到五天才能获得一个或多个完全充电和放电周期的数据,这既费时又费时。在不断变化的行驶周期和运行条件下变得不可靠。此外,在某个老化阶段确定的OCV-SoC关系无法用于整个生命周期和整个工作条件。在本文中,通过使用H无穷大滤波器在几秒钟内从任何现有的电流-电压测量中提取OCV-SoC关系,并在恒定电流条件和动态条件下对此进行了验证。我们的结果表明,估计的OCV可以导致SoC估计准确,最大误差为1%。 (C)2017 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Applied Energy》 |2017年第1期|346-353|共8页
  • 作者单位

    Beijing Inst Technol, Sch Mech Engn, Collaborat Innovat Ctr Elect Vehicles Beijing, 5 South Zhongguancun St, Beijing 100081, Peoples R China;

    Beijing Inst Technol, Sch Mech Engn, Collaborat Innovat Ctr Elect Vehicles Beijing, 5 South Zhongguancun St, Beijing 100081, Peoples R China|Wayne State Univ, Dept Elect & Comp Engn, Detroit, MI 48202 USA;

    Wayne State Univ, Dept Elect & Comp Engn, Detroit, MI 48202 USA;

    Beijing Inst Technol, Sch Mech Engn, Collaborat Innovat Ctr Elect Vehicles Beijing, 5 South Zhongguancun St, Beijing 100081, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Open circuit voltage; State-of-Charge; OCV-SoC relationship; H infinity filter; Lithium-ion batteries; Electric vehicles;

    机译:开路电压;充电状态;OCV-SoC关系;H无穷大滤波器;锂离子电池;电动汽车;
  • 入库时间 2022-08-18 00:07:59

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