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저항 열화 기반의 배터리 팩 편차 파라미터 추출 방안 및 검출 알고리즘
송정용,허창수,Song, Jung-Yong,Huh, Chang-Su 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.7
A large number of lithium-ion batteries are arranged in series and parallel in battery packs, such as those in electric vehicles or energy storage systems. As battery packs age, their output power and energy density drop because of voltage deviation, constant and non-uniform exposure to abnormal environments, and increased contact resistance between batteries; this reduces application system efficiency. Despite the balancing circuit and logic of the battery management system, the output of the battery pack is concentrated in the most severely aged unit cell and the output is frequently limited by power derating. In this study, we implemented a cell imbalance detection algorithm and selected parameters to detect a sudden decrease in battery pack output. In addition, we propose a method to increase efficiency by applying the measured testing values considering the operating conditions and abnormal conditions of the battery pack.
재사용 ESS를 위한 리튬 배터리 덴드라이트 보호 알고리즘 제안
송정용,허창수,Song, Jung-Yong,Huh, Chang-Su 한국전기전자재료학회 2018 전기전자재료학회논문지 Vol.31 No.6
The lithium-ion battery pack of an electric vehicle (EV) deserves to be considered for an alternative use within smart-grid infrastructure. Despite the long automotive service life, EV batteries retain over 70~80% of their initial capacity. These battery packs must be managed for their reliability and safety. Therefore, a battery management system (BMS) should use specific algorithms to measure and estimate the status of the battery. Most importantly, the BMS of a grid-connected energy storage system (ESS) must ensure that the lithium-ion battery does not catch fire or explode due to an internal short from uncontrolled dendrite growth. In other words, the BMS of a lithium-ion battery pack should be capable of detecting the battery's status based on the electrochemical reaction continuously until the end of the battery's lifespan. In this paper, we propose a new protection algorithm for a dendritic lithium battery. The proposed algorithm has applied a parameter from battery pack aging results and has control power managing.
혈관 치료용 자기 로봇의 고속 회전을 위한 전자기 구동 시스템의 강건 공진 회로 설계
이상열(Sang-Youl Lee),송정용(Jung-Yong Song),장건희(Gun-Hee Jang) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
We presented a robust resonant circuit (RC) for a magnetic navigation system (MNS) to generate high rotating magnetic field and to achieve high rotational motion of a magnetic robot. The conventional RC that controls capacitor as one variable to reduce impedance and to increase rotating magnetic field is susceptible to reactance errors due to its low resistance and high inductance that narrow the resonance bandwidth. We proposed a robust RC to widen band width by utilizing two conventional RC coupled with mutual inductor. The characteristics of the proposed RC was investigated by frequency response function. Also, we performed an optimal design about the resistance and mutual inductance of the proposed RC to widen the bandwidth at resonance. Finally, we demonstrated that the proposed RC is robuster in reactance error than the conventional RC via numerical analysis.