Scheduled Pre-Heating of Li-Ion Battery Packs for Balanced Temperature and State-of-Charge Distribution

Hien Vu and Donghwa Shin
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Hien Vu: Department of Software Convergence, Soongsil University, Seoul 06978, Korea
Donghwa Shin: Department of Smart Systems Software, Soongsil University, Seoul 06978, Korea

Energies, 2020, vol. 13, issue 9, 1-15

Abstract: Lithium-ion batteries exhibit significant performance degradation such as power/energy capacity loss and life cycle reduction in low-temperature conditions. Hence, the Li-ion battery pack is heated before usage to enhance its performance and lifetime. Recently, many internal heating methods have been proposed to provide fast and efficient pre-heating. However, the proposed methods only consider a combination of unit cells while the internal heating should be implemented for multiple groups within a battery pack. In this study, we investigated the possibility of timing control to simultaneously obtain balanced temperature and state of charge (SOC) between each cell by considering geometrical and thermal characteristics of the battery pack. The proposed method schedules the order and timing of the charge/discharge period for geometrical groups in a battery pack during internal pre-heating. We performed a pack-level simulation with realistic electro-thermal parameters of the unit battery cells by using the mutual pulse heating strategy for multi-layer geometry to acquire the highest heating efficiency. The simulation results for heating from ?30 ? C to 10 ? C indicated that a balanced temperature-SOC status can be achieved via the proposed method. The temperature difference can be decreased to 0.38 ? C and 0.19% of the SOC difference in a heating range of 40 ? C with only a maximum SOC loss of 2.71% at the end of pre-heating.

Keywords: battery pre-heating; lithium ion battery; mutual pulse heating; thermal model; battery cell grouping; dynamic battery model; idle period insertion (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: 2020
References: View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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