Mobile QR Code QR CODE : The Transactions of the Korean Institute of Electrical Engineers
Title A Study on Capacity Estimation of VRFB System Using Cumulated Charge
Authors 임남규(Nam-Gyu Lim) ; 송희욱(Hee-Wook Song) ; 정현홍(Hyeon-Hong Jung) ; 이성준(Seongjun Lee)
DOI https://doi.org/10.5370/KIEE.2021.70.9.1304
Page pp.1304-1311
ISSN 1975-8359
Keywords VRFB(Vanadium Redox Flow Battery); Cumulated Capacity; Capacity Fade; Crossover
Abstract VRFB is emerging as a new alternative to ESS batteries applied to renewable power generation systems to solve environmental and resource depletion problems. Currently, lithium batteries are mainly used in ESS, but there is a problem that a fire accident may occur and the lifespan is limited. VRFB has the advantage of being suitable for large-capacity systems because it has a longer lifespan than lithium batteries and has a capacity proportional to the amount of electrolyte. However, there is a disadvantage in that it is difficult to estimate the capacity due to the operating characteristics. Therefore, in this paper, we propose a capacity estimation method by applying the accumulated charge index of VRFB. In addition, the current integration method using the estimated capacity is presented, and the SOC estimation performance results using the long-term charge/discharge cycle experimental data are presented.