Li-Ion Battery Anode State of Charge Estimation and Degradation Monitoring Using Battery Casing via Unknown Input Observer

The anode state of charge (SOC) and degradation information pertaining to lithium-ion batteries (LIBs) is crucial for understanding battery over time. This about each cell in a pack can help prolong the pack’s life cycle. Because limited observability, estimating capacity fade difficult. task even more challenging cells pack, as current through individual not constant when are connected parallel. Considering these challenges, this paper presents novel method set up three-electrode by using battery’s casing reference electrode building pack. work continuation authors’ previous research. An unknown input observer (UIO) employed estimate SOC an To ensure stability defined Lyapunov function, UIO parameter matrices expressed linear matrix inequality (LMI). lithium nickel manganese cobalt oxide (NMC) estimated standard graphite potential (SGP) lithiation (SOL) characteristic curve. then calculated total transferred charging cycle anode. evaluated comparing fading carried cell. proposed which monitor real By method, we identify over-degraded remaining useful analysis on battery.