DEVICE AND METHOD FOR DIAGNOSING BATTERY

WIPO Patent Application WO/2022/019703

A1

The present invention provides a battery diagnosis device for determining a type of an error which has occurred in a battery cell, on the basis of a voltage of the battery cell. The battery diagnosis device comprises a voltage measurement circuit, a data processing circuit, and a diagnosis circuit. The voltage measurement circuit periodically measures voltages at opposite ends of the battery cell in a rest period. The data processing circuit derives a statistic value indicating the state of the battery cell on the basis of difference values between voltage values measured by the voltage measurement circuit and approximate values calculated on the basis of the measured voltage values. The diagnosis circuit determines whether an error has occurred in the battery cell, on the basis statistic values in multiple rest periods, and determines whether the type of the error corresponds to a first type in which the battery cell is unstable, a second type in which the voltage of the battery cell temporarily increases, or a third type in which the voltage of the battery cell temporarily decreases, on the basis of an accumulated statistic value corresponding to accumulation of absolute values of the statistic values and the statistic value in the rest period. The multiple rest periods comprise a rest period and one or more rest periods before the rest period.

LIM BO MI (KR)

PCT/KR2021/009542

January 27, 2022

July 23, 2021

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LG ENERGY SOLUTION LTD (KR)

G01R31/382; G01R19/165; G01R31/36; G01R31/367; G01R31/396

JP2008256436A	2008-10-23
JP2014167450A	2014-09-11
KR100534818B1	2005-12-08
JP2003059544A	2003-02-28
JP2010014636A	2010-01-21
KR20200091936A	2020-07-31

See also references of EP 4137829A4

BAE, KIM & LEE IP (KR)

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