US 11,955,828 B2
Battery management apparatus and method using non-destructive resistance analysis
Su-Won Jee, Daejeon (KR); Young-Deok Kim, Daejeon (KR); and Dae-Soo Kim, Daejeon (KR)
Assigned to LG ENERGY SOLUTION, LTD., Seoul (KR)
Appl. No. 17/270,684
Filed by LG CHEM, LTD., Seoul (KR)
PCT Filed Apr. 17, 2020, PCT No. PCT/KR2020/005188
§ 371(c)(1), (2) Date Feb. 23, 2021,
PCT Pub. No. WO2020/214000, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 10-2019-0046308 (KR), filed on Apr. 19, 2019.
Prior Publication US 2021/0344212 A1, Nov. 4, 2021
Int. Cl. H02J 7/00 (2006.01); G01R 31/367 (2019.01); G01R 31/3842 (2019.01); G01R 31/389 (2019.01); G01R 31/396 (2019.01); H01M 10/48 (2006.01)
CPC H02J 7/00712 (2020.01) [G01R 31/367 (2019.01); G01R 31/3842 (2019.01); G01R 31/389 (2019.01); G01R 31/396 (2019.01); H01M 10/48 (2013.01); H02J 7/0013 (2013.01); H02J 7/0047 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A battery management apparatus, comprising:
a voltage measurer configured to measure a voltage of a battery cell;
a current measurer configured to measure a current of the battery cell; and
a controller connected to the voltage measurer and the current measurer, the controller being configured to:
receive a voltage value for the voltage measured by the voltage measurer;
receive a current value for the current measured by the current measurer;
estimate an electricity amount of the battery cell, based on the received current value;
obtain an electricity amount-voltage curve for the battery cell, based on the estimated electricity amount and the received voltage value;
extract a plurality of inflection points from the obtained electricity amount-voltage curve;
classify 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;
extract 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;
calculate a first function value for the extracted electricity amount of the specific point from a derivative of the electricity amount-voltage curve;
extract a second function value corresponding to the first function value from a pre-stored reference electricity amount-voltage table; and
calculate 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.