Effects of Battery Model on the Accuracy of Battery SOC Estimation Using Extended Kalman Filter under Practical Vehicle Conditions Including Parasitic Current Leakage and Diffusion Of Voltage

Accurate estimation of battery State of Charge (SOC) is a crucial factor for the safe and efficient usage of the batteries in hybrid electric vehicles. The combined method of Coulomb counting and Open circuit Voltage (OCV) is already under practical usage for the estimation of battery SOC, but the m...

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Bibliographic Details
Published in:	International journal of automotive technology Vol. 22; no. 5; pp. 1337 - 1346
Main Authors:	Oh, Hyunjong, Jeon, Jeehwan, Park, Sungjin
Format:	Journal Article
Language:	English
Published:	Seoul The Korean Society of Automotive Engineers 01-10-2021 Springer Nature B.V 한국자동차공학회
Subjects:	Automotive Engineering Batteries Current leakage Dark current Driving conditions Electric vehicles Engineering Equivalent circuits Extended Kalman filter Hybrid electric vehicles Kalman filters Model accuracy Open circuit voltage State of charge 자동차공학 Extended Kalman filter (EKF) Coulomb counting method Electric circuit model (ECM) Micro hybrid electric vehicle (micro-HEV) Battery hardware-in-the-loop simulation (Battery HILS) Open circuit voltage (OCV) method State of charge (SOC)
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Summary:	Accurate estimation of battery State of Charge (SOC) is a crucial factor for the safe and efficient usage of the batteries in hybrid electric vehicles. The combined method of Coulomb counting and Open circuit Voltage (OCV) is already under practical usage for the estimation of battery SOC, but the methods have significant error when there is parasitic current leakage (dark current) or short rest period. Thus, Extended Kalman Filter (EKF) is one of the battery SOC estimation methods used to overcome such drawbacks. And, most importantly, due to structural dependency of EKF upon battery model, the battery model used for the EKF contributes significantly to the accuracy of EKF. Thus, in this paper, 3 types of battery Equivalent Circuit Models (ECMs) including second order RC model, first order RC model, and R model are compared under practical vehicle driving conditions. To simulate the vehicle driving condition, a micro Hybrid Electric Vehicle (micro-HEV) is modeled and simulation is conducted under NEDC condition.
ISSN:	1229-9138 1976-3832
DOI:	10.1007/s12239-021-0116-1