Apparatus and method for estimating power of secondary blended comprising blended cathode material

摘要

Disclosed is an apparatus and method for estimating a power of a secondary battery comprising a blended cathode material. The apparatus according to the present invention estimates a power of a secondary battery comprising a blended cathode material in which at least a first cathode material and a second cathode material are blended, the apparatus comprising a discharging means for discharging the secondary battery under conditions of a plurality of discharge rates (c-rate) different from each other, a sensor means for measuring a plurality of discharge termination voltages (Vf) corresponding to the conditions of the plurality of discharge rates, and a control means for approximating a correlation between the plurality of discharge rates and the plurality of discharge termination voltages by a two-dimensional linear equation, calculating a maximum discharge rate (Cmax) of the secondary battery corresponding to a minimum discharge voltage (Vmin) using the linear equation, and estimating a maximum power (Pmax) of the secondary battery from the calculated maximum discharge rate.

主权项

1. An apparatus for estimating a power of a secondary battery including a blended cathode material including at least a first cathode material and a second cathode material, the apparatus comprising:
a discharging means configured to discharge a secondary battery under conditions of a plurality of discharge rates different from each other and larger than a transition discharge rate corresponding to a state of charge (SOC) of the secondary battery, wherein a cathode material into which a working ion is mainly intercalated changes from the first cathode material to the second cathode material based on the transition discharge rate when the secondary battery is discharged; a sensor means configured to measure a plurality of discharge termination voltages corresponding to the conditions of the plurality of discharge rates; and a control means configured to approximate a correlation between the plurality of discharge rates and the plurality of discharge termination voltages by a two-dimensional linear equation, calculate a maximum discharge rate of the secondary battery corresponding to a minimum discharge voltage using the linear equation, and estimate a maximum power of the secondary battery from the calculated maximum discharge rate.