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Received January 29, 2021
Accepted March 17, 2021
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리튬이온전지의 사이클 수명 모델링
Modeling to Estimate the Cycle Life of a Lithium-ion Battery
아주대학교 에너지시스템학과, 16499 경기도 수원시 영통구 월드컵로 206 1한국에너지기술연구원 광주바이오에너지연구개발센터, 61003 광주광역시 북구 삼소로 270번길 25
Division of Energy System, Ajou University, 206, World cup-ro, Yeongtong-gu, Suwon-si, Gyeonggi-do, 16499, Korea 1Gwangju Bioenergy R&D Center, Korea Institute of Energy Research, 25, Samso-ro 270beon-gil, Buk-gu, Gwangju, 61003, Korea
cbshin@ajou.ac.kr
Korean Chemical Engineering Research, August 2021, 59(3), 393-398(6), 10.9713/kcer.2021.59.3.393 Epub 20 July 2021
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Abstract
리튬이온전지의 성능을 최적화하기 위해서는 여러 열화 요소들을 고려한 성능 예측 모델링 기술이 필요하다. 본 연구에서는 리튬이온전지의 사이클 노화로 인한 방전 거동 및 사이클 수명 변화를 수학적으로 모델링하였다. 모델링의 신뢰성을 검증하기 위해 0.25C로 사이클 시험을 진행했으며, 30 사이클 간격으로 진행한 RPT (Reference performance test)를 통해 전기적 거동을 파악하였다. 기존의 리튬이온전지의 사이클 수명 예측 모델에 BOL (Beginning of life)에서 일어나는 현상 중 하나인 Break-in 메커니즘을 반영하여 수명예측 정확도를 개선시켰다. 모델에 근거하여 예측된 사이클 수명 변화는 실제 시험 결과와 잘 일치하였다.
In order to optimize the performance of a lithium-ion battery, a performance prediction modeling technique that considers various degradation factors is required. In this work, mathematical modeling was carried-out to predict the change in discharging behavior and cycle life, taking into account the cycle aging of lithium-ion batteries. In order to validate the modeling, a cycling test was performed at the charge/discharge rate of 0.25C, and discharging behavior was measured through RPT (Reference Performance Test) performed at 30 cycle intervals. The accuracy of cycle life prediction was improved by considering the break-in mechanism, one of the phenomena occurring in the BOL (beginning of life), in the model for predicting the cycle life of lithium-ion batteries. The predicted change in cycle life based on the model was in good agreement with the experimental results.
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