Capacity estimation algorithm with a second-order differential voltage curve for Li-ion batteries with NMC cathodes
作者： Taedong Goh , Minjun Park , Minhwan Seo , Jun Gu Kim , Sang Woo Kim
DOI: 10.1016/J.ENERGY.2017.06.141
关键词:
摘要: Abstract Accurate diagnosis of battery degradation is important for safe and efficient management. Capacity a reliable index to describe the state health (SOH) in batteries. In this paper, capacity estimation algorithm Li-ion batteries with nickel, manganese, cobalt (NMC) cathodes based on second-order differential voltage proposed. A reference curve was obtained during CC charging phase from fresh beforehand, input measured compared, under same operating conditions, an aged battery. The aligned minimize error voltage. compensated time has linear relation until reduction reaches 23.5%. From model, can be estimated easily. This method verified five packs different discharge currents. aging cycle initial SOC variation test, less than 2% it 76.5% capacity. proposed does not require complete test (for table) relate
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