Apparatus and method for estimating power of secondary blended comprising blended cathode material
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United States of America Patent
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Jul 12, 2016
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Feb 19, 2015
app pub date -
Nov 3, 2014
filing date -
Nov 3, 2014
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Abstract
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.
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