Research on Battery State Estimation and Prediction Model Construction

The charging and discharging process of lithium-ion battery is the process of mutual conversion of electrical and chemical energy, and its performance will gradually decline during its use. However, in practical applications, it is difficult to accurately estimate and predict the state of lithium-ion batteries. In this study, the internal parameter evolution of the battery during storage is investigated by establishing a quasi-steady-state model of the lithium-ion battery, and a decay model is established for predicting the evolution of the battery. Using the established model, the correspondence between the external characteristics and the internal state of lithium-ion batteries containing composite electrodes is investigated, and the accurate estimation of the state of the composite electrodes is realized based on the steady-state voltage of the composite electrodes and the characteristics of their differential curves. The simulation results of the model are in high agreement with the experimental results, indicating that the established model can accurately describe the storage decay process of the battery.