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Study of Battery State-of-charge Estimation with kNN Machine Learning Method

논문 기본 정보

저자정보
(Busan University of Foreign Studies) (Busan University of Foreign Studies) (Busan University of Foreign Studies)
저널정보
대한전자공학회 IEIE Transactions on Smart Processing & Computing IEIE Transactions on Smart Processing & Computing Vol.10 No.6
발행연도
수록면
496 - 504 (9page)
DOI
10.5573/IEIESPC.2021.10.6.496
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피인용 1

Study of Battery State-of-charge Estimation with kNN Machine Learning Method
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    초록·키워드

    Electric vehicles have high demand due to their ecofriendly nature. From this point of view, lithium batteries have gained high attention in recent days due to their high efficiency and long life time. Hence, it is of the utmost importance to evaluate the battery characteristics, such as the state of charge (SOC), depth of discharge (DOD), and remaining life of a battery to ensure battery safety. These parameters were derived in order to estimate the battery life time before degradation. This estimation is very much required in making a decision about battery usage in the future. In this study, the SOC of a lithium polymer battery was evaluated in a real-time experiment. Charging and discharging cycles were done, and we obtained the voltage, current, and time data from the experimental result. This experimental data trained machine learning methods such as the kNN (k Nearest Neighbor) method to estimate the SOC more precisely. After training the model, a test was done. The proposed estimator was calibrated by experimental data. The results are satisfactory with accuracy of 98% and mean absolute error (MAE) as low as 0.74[%].

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