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Jonghoon Kim,Jongwon Shin,Changyoon Chun,Cho, B. H. IEEE 2012 IEEE transactions on power electronics Vol.27 No.1
<P>Differences in electrochemical characteristics among Li-ion cells inevitably result in state-of-charge (SOC) imbalance when the existing voltage balancing technique is used. This paper presents a new approach based on a screening process for improved voltage/SOC balancing of a Li-ion series battery pack. Two kinds of screening processes, capacity screening and resistance screening, are implemented in an orderly manner. The capacity screening process matches open-circuit voltage (OCV)-SOC relation for achievement of voltage/SOC balancing. In the resistance screening process, pulse-type discharging/charging currents are applied to various SOC points to select the cells with similar voltage variance. Through two screening processes, the cells that have similar electrochemical characteristics are finally selected, and can be used for stable configuration of a Li-ion series battery pack. The proposed screening process has been validated by extensive experimental results and SOC estimation results based on extended Kalman filter.</P>
배터리 제어 전략 분석 및 시스템 최적화를 위한 제조사별 PHEV 구조 및 시스템 분석
정해성(Haeseong Jeoung),이기욱(Kiwook Lee),김남욱(Namwook Kim),오승석(Seungsuk Oh),전창윤(Changyoon Chun),이태경(Tae-Kyung Lee) 한국자동차공학회 2019 한국자동차공학회 부문종합 학술대회 Vol.2019 No.5
In order to meet the world fuel economy standards, the global vehicle market of Hybrid Electric Vehicle(HEV), Plug-in Hybrid Electric Vehicle(PHEV), Battery Electric Vehicle(BEV), and even Fuel Cell Electric Vehicle(FCEV) has been growing rapidly. Among them, PHEV which consists of Charge Depleting mode(CD mode) and Charge Sustaining mode(CS mode) has both characteristics of HEV and BEV. In this paper, the representative PHEVs in Toyota, Honda, and General Motors(GM) are analyzed respectively focusing on the powertrain configurations and control strategies, which is the first step of this study. Based on the conclusion of each characteristic of PHEVs, this study will move on to the next steps for developing the battery control strategy and optimizing the system.