Simulation-Based Prediction of Residual Performance of Lithium-Ion Batteries

This study proposes a simulation-based evaluation method for lithium-ion batteries (LiB), which enables the estimation of the performance of the battery under different use conditions. In this study, the battery performance is defined as energy density and power density based on users' needs. The degradation of the battery performance consists of three factors, which are capacity fade, an increase in the internal resistance, and the effect of diffusion. With the battery simulator we developed, battery degradation can be simulated by changing three input parameters, each of which corresponding to the degradation factors. Case studies of the evaluation method for aged 18650 cells indicates that aged battery after 1,500 cycles can be used as stationary batteries, but not as batteries for electric vehicles, especially at low temperatures.