Patent ID: 11955828
Assignee: LG ENERGY SOLUTION, LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H  Y | IPC G  H

Claim 10:
11. A battery management method operated in a battery management apparatus, comprising:
a voltage and current measuring operation of measuring voltage and current of a battery cell;
an electricity amount estimating operation of estimating an electricity amount of the battery cell, based on the measured current;
an electricity amount-voltage curve obtaining operation of obtaining an electricity amount-voltage curve for the battery cell, based on the estimated electricity amount and the measured voltage value;
an inflection point extracting operation of extracting a plurality of inflection points from the obtained electricity amount-voltage curve;
classifying, with a controller in the battery management apparatus, inflection points at which a derivative curve of the electricity amount-voltage curve has an upwardly convex shape, among the plurality of inflection points in the electricity amount-voltage curve, as a first inflection point group;
an electricity amount extracting operation of extracting an electricity amount of a specific point satisfying a predetermined condition among the inflection points in the first inflection point group of the plurality of extracted inflection points;
a first function value calculating operation of calculating a first function value for the extracted electricity amount of the specific point from a derivative of the electricity amount-voltage curve;
a second function value extracting operation of extracting a second function value corresponding to the first function value in a pre-stored reference electricity amount-voltage table; and
a resistance change rate calculating operation of calculating a resistance change rate of a present resistance with respect to an initial resistance of the battery cell, based on the first function value and the second function value.