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인공위성용 리튬이온 배터리의 잔존 수명 및 내부 파라미터 분석
윤창오 ( Chang-o Yoon ),김종훈 ( Jonghoon Kim ),문은아 ( Eun-a Moon ),김기현 ( Ki-hyun Kim ) 조선대학교 공학기술연구원 2017 공학기술논문지 Vol.10 No.1
This researches introduces the lifetime prediction and internal parameter analysis of lithium-ion cell for spacecraft application such as satellite and launch vehicle. Two kinds of lithium-ion cylindrical cells (18650 type; 2.5Ah, 26650 type; 3.5Ah) with high-power characteristics were used. With increased cycling, discharge capacity and hybrid-pulse power characterization (HPPC)-based internal resistances were measured and compared with that of fresh lithium-ion cell. From these results, it can be surely expected to predict the lifetime of lithium-ion cell and to provide good solution for well-established lithium-ion battery pack in satellite and launch vehicle.
Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub>(LTO) 배터리 등가회로 모델링을 위한 내부 파라미터 체계적 해석
이평연,윤창오,박진형,김종훈,Lee, Pyeong-Yeon,Yoon, Chang-O,Park, Jin-Hyeong,Kim, Jonghoon 전력전자학회 2018 전력전자학회 논문지 Vol.23 No.3
This study introduces a systematic approach to selecting the internal parameters applied to the equivalent electrical-circuit model (EECM) of a lithium titanium oxide ($Li_4Ti_5O_{12}$; LTO) rechargeable cell. Based on the dynamic characteristic of the cell, a simplified EECM consisting of an open-circuit voltage (OCV), an ohmic resistance, and an RC ladder is fabricated. To select the internal parameters of a simplified EECM, experiments on discharge capacity, OCV, and discharge/charge resistances are performed using hybrid pulse power characterization and direct current internal resistance (DCIR) measurements over the full state-of-charge (SOC) range. The experimental results of the LTO rechargeable cell highlight the importance of correct selection of internal parameters that can reduce EECM errors. This study clearly provides experimental procedures, internal parameters results, and EECM guidelines for adaptive control-based SOC estimation for LTO rechargeable cells.