BATTERY MANAGEMENT DEVICE, BATTERY MANAGEMENT METHOD, AND NON-TRANSITORY STORAGE MEDIUM

A battery management device includes a high-frequency signal supply unit configured to apply a high-frequency signal having a frequency equal to or higher than 0.1 MHz to a first battery cell having a low battery temperature among a plurality of battery cells constituting a lithium-ion secondary battery, an impedance detection unit configured to detect a real part of alternating current impedance of the first battery cell to which the high-frequency signal is applied, and a determination unit configured to determine whether Li has been precipitated in the lithium-ion secondary battery based on the real part of the alternating current impedance of the first battery cell.