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http://dx.doi.org/10.5762/KAIS.2020.21.3.585

Implementation of Battery Management System for Li-ion Battery Considering Self-energy Balancing  

Kim, Ji-Myung (Department of Electrical Engineering, Korea University of Technology and Education)
Lee, Hu-Dong (Department of Electrical Engineering, Korea University of Technology and Education)
Tae, Dong-Hyun (Department of Electrical Engineering, Korea University of Technology and Education)
Ferreira, Marito (Department of Electrical Engineering, Korea University of Technology and Education)
Park, Ji-Hyun (Department of Electrical Engineering, Korea University of Technology and Education)
Rho, Dae-Seok (Department of Electrical Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.21, no.3, 2020 , pp. 585-593 More about this Journal
Abstract
Until now, 29 fire accidents have occurred; 22 of them were caused by the interconnection of renewable energy sources that occurred during the rest period after the lithium-ion battery had been fully charged regardless of the seasons. The fire accidents of ESS were attributed to thermal runaway due to the overcharging of a few cells with the phenomenon of self-energy balancing, which is unintentional current flow from cells with a high SOC to the low cells if the SOC condition of each cell connected in parallel is different. Therefore, this paper proposes a novel configuration and operation algorithm of the BMS to prevent the self-energy balancing of ESS and presents a hybrid SOC estimation algorithm. From the test results of the self-energy balancing phenomenon between aging and normal cells based on the proposed algorithm and BMS, it was confirmed the possibility of self-energy balancing, which is unintentional current flow from cells with a high SOC to cells with a low SOC. In addition, the proposed configuration of the BMS is useful and practical to improve the safety of lithium-ion batteries because the BMS can reliably disconnect a parallel connection of the cells if the self-energy balancing current becomes excessively high.
Keywords
BMS; Li-ion Battery; Self-energy Balancing; Aging Cell; Fire Accident of ESS; Labview S/W;
Citations & Related Records
Times Cited By KSCI : 12  (Citation Analysis)
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