State-of-Charge Estimation of LiFePO4-Li4Ti5O12 Batteries using History-Dependent Complex-Impedance

被引：24

作者：

La Rue, Aleksei ^{[1
]}

Weddle, Peter J. ^{[2
]}

Ma, Miaomiao ^{[3
]}

Hendricks, Christopher ^{[3
]}

Kee, Robert J. ^{[2
]}

Vincent, Tyrone L. ^{[1
]}

机构：

[1] Colorado Sch Mines, Dept Elect Engn, Golden, CO 80401 USA

[2] Colorado Sch Mines, Dept Mech Engn, Golden, CO 80401 USA

[3] Naval Surface Warfare Ctr Carderock Div, Bethesda, MD 20817 USA

来源：

JOURNAL OF THE ELECTROCHEMICAL SOCIETY | 2019年 / 166卷 / 16期

关键词：

LI-ION BATTERIES; MANAGEMENT-SYSTEMS; INSERTION; PACKS; HEALTH;

D O I：

10.1149/2.0221916jes

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The present paper seeks to extract, analyze, and interpret the electrochemical impedance spectra of a LiFePO4-Li4Ti5O12 battery to supplement state-of-charge estimation. A particular challenge in determining the state-of-charge of a LiFePO4-Li4Ti5O12 cell is that the open-circuit voltage is flat over a large range of states of charge. Because the voltage in standard batteries is typically used to inform state-of-charge estimation, a different corrective factor needs to be determined for this cell chemistry. Instead of using the battery voltage, the present study uses the battery's dynamic response to assist state of charge estimation. The present work includes at least three novel contributions: 1) the electrochemical impedance of the LiFePO4-Li4Ti5O12 cell is shown to be strongly history dependent, 2) a novel system-identification technique is implemented to extract the EIS in-situ, and 3) a signature electrochemical impedance spectra attribute is identified that is a strong function of battery state of charge. (C) 2019 The Electrochemical Society.

引用

页码：A4041 / A4046

页数：6

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