DEVICE AND METHOD FOR DETECTING BATTERY CONDITION

A device for detecting a battery condition may include a storage device storing a battery model that models a voltage change and an internal impedance of a battery as an electrical circuit, and a control device configured to estimate a distribution status of lithium ions in a positive electrode active material of the battery, detect a distortion zone remaining in a boundary portion of two identical-phase regions in the positive electrode active material based on the distribution status, estimate an overvoltage caused by the distortion zone, correct the battery model by using a correction parameter corresponding to the overvoltage, and estimate a condition of the battery by using the battery model.