Nonlinear Temperature-Dependent State Model of Cylindrical LiFePO 4 Battery for Open-Circuit Voltage, Terminal Voltage and State-of-Charge Estimation with Extended Kalman Filter

Cheng Siong Chin, Zuchang Gao, Joel Hay King Chiew and Caizhi Zhang
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Cheng Siong Chin: Faculty of Science, Agriculture and Engineering, Newcastle University Singapore, Singapore 599493, Singapore
Zuchang Gao: School of Engineering, Temasek Polytechnic, Singapore 529757, Singapore
Joel Hay King Chiew: School of Engineering, Temasek Polytechnic, Singapore 529757, Singapore
Caizhi Zhang: School of Automotive Engineering, Chongqing University, Chongqing 400044, China

Energies, 2018, vol. 11, issue 9, 1-28

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 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.

Keywords: lithium iron phosphate battery cell (ANR26650M1-B); ambient temperature; cell temperature; hysteresis voltage; thermal aging; static capacity; extended Kalman filter; terminal voltage; state of charge (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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