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Keywords = lithium iron phosphate battery cell (ANR26650M1-B)

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28 pages, 14272 KiB  
Article
Nonlinear Temperature-Dependent State Model of Cylindrical LiFePO4 Battery for Open-Circuit Voltage, Terminal Voltage and State-of-Charge Estimation with Extended Kalman Filter
by Cheng Siong Chin, Zuchang Gao, Joel Hay King Chiew and Caizhi Zhang
Energies 2018, 11(9), 2467; https://doi.org/10.3390/en11092467 - 17 Sep 2018
Cited by 28 | Viewed by 6043
Abstract
Ambient temperature affects the performance of a battery power system and its accuracy in state-of-charge (SOC) estimation for electric vehicles and smart grid systems. This paper proposes a battery model that considered ambient temperature, cell temperature, hysteresis voltage and thermal aging [...] Read more.
Ambient temperature affects the performance of a battery power system and its accuracy in state-of-charge (SOC) estimation for electric vehicles and smart grid systems. This paper proposes a battery model that considered ambient temperature, cell temperature, hysteresis voltage and thermal aging on capacity due to multiple charging and discharging. The SOC is then estimated using an extended Kalman filter. Several forms of validation were tested on an actual cell battery under specific ambient temperatures to verify the battery cell model, terminal voltage and SOC estimation performance. The SOC estimation results show an improvement in root-mean-squared error as compared to Extended Kalman Filter (EKF) without considering the temperature dependency. The proposed battery temperature-dependent model gave a smaller root-mean square error in SOC and terminal voltage at 5 °C, 15 °C and 45 °C. Full article
(This article belongs to the Special Issue 10 Years Energies - Horizon 2028)
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