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Improved State of Charge Estimation for High Power Lithium Ion Batteries Considering Current Dependence of Internal Resistance

Author

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  • Cunxue Wu

    (College of Automotive Engineering, Chongqing University, Chongqing 40044, China
    China Chang’an Automotive Engineering Institute, Chongqing 401120, China)

  • Rujian Fu

    (A123 Systems, LLC., Livonia, MI 48377, USA)

  • Zhongming Xu

    (College of Automotive Engineering, Chongqing University, Chongqing 40044, China)

  • Yang Chen

    (A123 Systems, LLC., Livonia, MI 48377, USA)

Abstract

For high power Li-ion batteries, an important approach to improve the accuracy of modeling and algorithm development is to consider the current dependence of internal resistance, especially for large current applications in mild/median hybrid electric vehicles (MHEV). For the first time, the work has experimentally captured the decrease of internal resistance at an increasing current of up to the C-rate of 25 and developed an equivalent circuit model (ECM) with current dependent parameters. The model is integrated to extended Kalman filter (EKF) to improve SOC estimation, which is validated by experimental data collected in dynamic stress testing (DST). Results show that EKF with current dependent parameters is capable of estimating SOC with a higher accuracy when it is compared to EKF without current dependent parameters.

Suggested Citation

  • Cunxue Wu & Rujian Fu & Zhongming Xu & Yang Chen, 2017. "Improved State of Charge Estimation for High Power Lithium Ion Batteries Considering Current Dependence of Internal Resistance," Energies, MDPI, vol. 10(10), pages 1-17, September.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:10:p:1486-:d:113132
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    References listed on IDEAS

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    1. Marongiu, Andrea & Nußbaum, Felix Gerd Wilhelm & Waag, Wladislaw & Garmendia, Maitane & Sauer, Dirk Uwe, 2016. "Comprehensive study of the influence of aging on the hysteresis behavior of a lithium iron phosphate cathode-based lithium ion battery – An experimental investigation of the hysteresis," Applied Energy, Elsevier, vol. 171(C), pages 629-645.
    2. Waag, Wladislaw & Käbitz, Stefan & Sauer, Dirk Uwe, 2013. "Experimental investigation of the lithium-ion battery impedance characteristic at various conditions and aging states and its influence on the application," Applied Energy, Elsevier, vol. 102(C), pages 885-897.
    3. Xing, Yinjiao & He, Wei & Pecht, Michael & Tsui, Kwok Leung, 2014. "State of charge estimation of lithium-ion batteries using the open-circuit voltage at various ambient temperatures," Applied Energy, Elsevier, vol. 113(C), pages 106-115.
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    1. Theodoros Kalogiannis & Md Sazzad Hosen & Mohsen Akbarzadeh Sokkeh & Shovon Goutam & Joris Jaguemont & Lu Jin & Geng Qiao & Maitane Berecibar & Joeri Van Mierlo, 2019. "Comparative Study on Parameter Identification Methods for Dual-Polarization Lithium-Ion Equivalent Circuit Model," Energies, MDPI, vol. 12(21), pages 1-35, October.

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