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Capacity estimation algorithm with a second-order differential voltage curve for Li-ion batteries with NMC cathodes SCIE SCOPUS

Title
Capacity estimation algorithm with a second-order differential voltage curve for Li-ion batteries with NMC cathodes
Authors
Goh, TaedongPark, MinjunSeo, MinhwanKim, Jun GuKim, Sang Woo
Date Issued
2017-09
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Abstract
Accurate diagnosis of battery degradation is important for safe and efficient battery management. Capacity is a reliable index to describe the state of health (SOH) in batteries. In this paper, a capacity estimation algorithm for Li-ion batteries with nickel, manganese, and cobalt (NMC) cathodes based on a second-order differential voltage is proposed. A reference voltage curve was obtained during the CC charging phase from a fresh battery beforehand, and the input voltage curve was measured and compared, under the same operating conditions, from an aged battery. The input voltage curve is aligned to the reference curve to minimize the error of the second-order differential voltage. The compensated charging time of the aligned curve has a linear relation with the battery capacity until capacity reduction reaches 23.5%. From the linear model, the capacity can be estimated easily. This method is verified for five packs aged with different discharge currents. In the aging cycle and the initial SOC variation test, the capacity estimation error is less than 2% until it reaches 76.5% capacity. The proposed method does not require a complete aging test (for the table) to relate the charging time and the capacity. (C) 2017 Elsevier Ltd. All rights reserved.
Keywords
ON-BOARD STATE; HEALTH ESTIMATION; CYCLE LIFE; ELECTRIC VEHICLES; LITHIUM; CELLS; MANAGEMENT; CALENDAR; ENERGY; CHARGE
URI
https://oasis.postech.ac.kr/handle/2014.oak/92020
DOI
10.1016/j.energy.2017.06.141
ISSN
0360-5442
Article Type
Article
Citation
ENERGY, vol. 135, page. 257 - 268, 2017-09
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김상우KIM, SANG WOO
Dept of Electrical Enginrg
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