Robust Online State of Charge Estimation of Lithium-Ion Battery Pack Based on Error Sensitivity Analysis

Robust Online State of Charge Estimation of Lithium-Ion Battery Pack Based on Error Sensitivity Analysis
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基于误差敏感性分析的锂离子电池组荷电状态在线鲁棒估计

DOI:
10.1155/2015/573184
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发表时间:
2015-10
影响因子:
--
通讯作者:
Caiping Zhang
Caiping Zhang
中科院分区:
工程技术4区
文献类型:
--
作者:
Ting Zhao;Jiuchun Jiang;Caiping Zhang

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准确可靠的荷电状态(SOC)估计是大规格锂离子电池组的关键使能技术,因为其在电池安全和有效管理中起着至关重要的作用。本文试图通过鲁棒算法对现有文献做出三个贡献。(1)建立了基于观测器的SOC估计误差模型,通过定量分析确定了影响SOC估计精度的关键参数,为参数更新提供了依据。(2)提出了一种考虑电池不一致性的电池组SOC估计方法,保证了所有电池的SOC在0 ~ 1之间,有效地避免了电池的过充/过放。本文还提出了参数的在线估计。(3)利用硬件在环仿真平台验证了电池组SOC估计的准确性。在不同的动态测试条件下,温度,和两个电池之间的初始SOC差异的实验结果证明了所提出的方法的有效性。
Accurate and reliable state of charge (SOC) estimation is a key enabling technique for large format lithium-ion battery pack due to its vital role in battery safety and effective management. This paper tries to make three contributions to existing literatures through robust algorithms. (1) Observer based SOC estimation error model is established, where the crucial parameters on SOC estimation accuracy are determined by quantitative analysis, being a basis for parameters update. (2) The estimation method for a battery pack in which the inconsistency of cells is taken into consideration is proposed, ensuring all batteries’ SOC ranging from 0 to 1, effectively avoiding the battery overcharged/overdischarged. Online estimation of the parameters is also presented in this paper. (3) The SOC estimation accuracy of the battery pack is verified using the hardware-in-loop simulation platform. The experimental results at various dynamic test conditions, temperatures, and initial SOC difference between two cells demonstrate the efficacy of the proposed method.
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