Optimization on charging of the direct hybrid lithium-ion battery and supercapacitor for high power application through resistance balancing

Ao Dong, Ruifei Ma and Yelin Deng

Energy, 2023, vol. 273, issue C

Abstract: The purpose of this study is to fill the research gap of direct parallel charging for batteries and supercapacitors. However, a simple parallel connection between the two will create a disproportionate current distribution and limit the effective capacity utilization. Thus, two approaches have been evaluated in this study to maximize the capacity utilization under large current applications: pulse charging and constant current charging under fine-tuning the resistance distribution. The results show the fine-tuning resistance method is superior to pulse charging in terms of effective charging capacity and charging time. Compared with the pulse charging (50% duty cycle) at 2.75C, the fine-tuning resistance method (50 mΩ) can shorten the charging time by 10.6 min and increase the charging capacity by 30.5%. Compared with the constant current charging (CC), the charging time is only prolonged by 6.8 min with this method, but the charging capacity is increased by 48.4%, reaching 95.1% of the rated capacity for the hybrid system. As for the battery life within the hybrid system, compared with the same capacity battery pack with the exact total charging current, the fine-tuning resistance method can extend the battery life by 8.2% at 2.75C and 14.2% at 3.75C.

Keywords: Lithium-ion battery; Supercapacitor; Direct parallel charging; Fine-tuning resistance method; Pulse charging; Battery life (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:273:y:2023:i:c:s0360544223006278

DOI: 10.1016/j.energy.2023.127233

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