Discharging/Charging Voltage-Temperature Pattern Recognition for Improved SOC/Capacity Estimation and SOH Prediction at Various Temperatures

Jonghoon Kim; Seongjun Lee; Bohyung Cho

Discharging/Charging Voltage-Temperature Pattern Recognition for Improved SOC/Capacity Estimation and SOH Prediction at Various Temperatures

Jonghoon Kim

Seongjun Lee

Bohyung Cho

Vol. 12, No. 1, pp. 1-9, Jan. 2012

10.6113/JPE.2012.12.1.1

Dual extended Kalman filter (DEKF)

Hamming network

pattern recognition

State-of-charge (SOC)

State-of-health (SOH)

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Abstract

This study investigates an application of the Hamming network-dual extended Kalman filter (DEKF) based on pattern recognition for high accuracy state-of-charge (SOC)/capacity estimation and state-of-health (SOH) prediction at various temperatures. The averaged nine discharging/charging voltage-temperature (DCVT) patterns for ten fresh Li-Ion cells at experimental temperatures are measured as representative patterns, together with cell model parameters. Through statistical analysis, the Hamming network is applied to identify the representative pattern that matches most closely with the pattern of an arbitrary cell measured at any temperature. Based on temperature-checking process, model parameters for a representative DCVT pattern can then be applied to estimate SOC/capacity and to predict SOH of an arbitrary cell using the DEKF. This avoids the need for repeated parameter measuremet.

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Cite this article

[IEEE Style]

J. Kim, S. Lee, B. Cho, "Discharging/Charging Voltage-Temperature Pattern Recognition for Improved SOC/Capacity Estimation and SOH Prediction at Various Temperatures," Journal of Power Electronics, vol. 12, no. 1, pp. 1-9, 2012. DOI: 10.6113/JPE.2012.12.1.1.

[ACM Style]

Jonghoon Kim, Seongjun Lee, and Bohyung Cho. 2012. Discharging/Charging Voltage-Temperature Pattern Recognition for Improved SOC/Capacity Estimation and SOH Prediction at Various Temperatures. Journal of Power Electronics, 12, 1, (2012), 1-9. DOI: 10.6113/JPE.2012.12.1.1.