DEVICE AND METHOD FOR DETECTING BATTERY CONDITION

A device for detecting a battery condition (10) may include a storage device (11) storing a battery model (111) that models a voltage change and an internal impedance of a battery (20) as an electrical circuit, and a control device (13) configured to estimate a distribution status of lithium ions in a positive electrode active material of the battery (20), 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 (111) by using a correction parameter corresponding to the overvoltage, and estimate a condition of the battery (20) by using the battery model (111).