Lithium Battery Model and Its Application to Parallel Charging

Yueh-Tsung Shieh, Chih-Chiang Wu, Ching-Yao Liu, Wei-Hua Chieng, Yu-Sheng Su, Shyr-Long Jeng and Edward-Yi Chang
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Yueh-Tsung Shieh: Department of Mechanical Engineering, College of Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Chih-Chiang Wu: Mechanical and Mechatronics Systems Research Laboratories, Industrial Technology Research Institute, Hsinchu 31040, Taiwan
Ching-Yao Liu: Department of Mechanical Engineering, College of Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Wei-Hua Chieng: Department of Mechanical Engineering, College of Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Yu-Sheng Su: International College of Semiconductor Technology, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan
Shyr-Long Jeng: Department of Mechanical Engineering, Lunghwa University of Science and Technology, Taoyuan City 33306, Taiwan
Edward-Yi Chang: Department of Material Science and Engineering, College of Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan

Energies, 2022, vol. 15, issue 13, 1-21

Abstract: A new SOC (State-Of-Charge)–VOC (Voltage-of-Open-Circuit) mathematical model was proposed in this paper, which is particularly useful in parallel lithium battery modeling. When the battery strings are charged in parallel connection, the batteries can be deemed as capacitors with different capacitances, and the one with larger capacitance always obtains the higher current. According to this mathematical model, the parallel battery charging with different peak capacitances can result in different voltage slew rates on different battery strings during the constant current control. Different parallel battery strings are charged with different currents, of which the battery string under higher current can induce higher power loss and higher temperature. The conventional solution can use this model to switch the constant current charging into the constant voltage charging with the correct timing to avoid overcurrent charging. Other battery pack protection methods including current sense resistor, resettable thermal cutoff device, or resettable fuse can also use this mathematical model to improve the protection. In the experiments, three kinds of batteries including LiFePO 4 battery, EV Type-1 battery, and ternary battery were examined. The experiments showed good consistency with the simulation results derived from the mathematical model.

Keywords: battery modeling; parallel charging; SOC –VOC (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: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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