DEVICE AND METHOD FOR ESTIMATING BATTERY RESISTANCE

Disclosed is a battery resistance estimation apparatus. The battery resistance estimation apparatus according to the present disclosure includes a memory unit to store a resistance lookup table in which resistance data is recorded according to a state of charge-temperature (SOC-T) condition of a battery, and a control unit, wherein the control unit includes a resistance accumulation calculation unit to measure I-V data while the battery is charged/discharged, calculate resistance by dV/dI repeatedly on a periodic basis and store the resistance in the memory unit, wherein the resistance is accumulated and stored by the SOC-T condition, and a resistance data update unit to calculate a weighted average of new resistance data and previously stored resistance data and update resistance data corresponding to a corresponding SOC-T condition to the weighted average, wherein the new resistance data is one of an average of the resistance data stored in the memory unit by the SOC-T condition, an average of maximum and minimum, and a maximum.