Title:
BATTERY DIAGNOSIS DEVICE, BATTERY DIAGNOSIS METHOD, BATTERY PACK AND ELECTRIC VEHICLE
Document Type and Number:
WIPO Patent Application WO/2022/145831
Kind Code:
A1
Abstract:
A battery diagnosis device according to the present invention comprises: a voltage sensor that generates a voltage signal indicating a battery voltage of a battery; a current sensor that generates a current signal indicating a battery current of the battery; and a control circuit. A capacity curve indicating the relationship between the battery voltage and a charging capacity within a set voltage range is determined on the basis of the voltage signal and the current signal, which are collected every unit time during a constant current charging period. The control circuit determines, on the basis of the capacity curve, a differential curve indicating the relationship between the battery voltage and a differential capacity within the set voltage range. The control circuit determines an approximate straight line of the differential curve by using a linear approximation algorithm, and determines whether a lithium precipitation abnormality has occurred in the battery, on the basis of the approximate straight line.
Inventors:
KIM YOUNG-JIN (KR)
Application Number:
PCT/KR2021/019238
Publication Date:
July 07, 2022
Filing Date:
December 16, 2021
Export Citation:
Assignee:
LG ENERGY SOLUTION LTD (KR)
International Classes:
G01R31/367; B60L58/10; G01R19/165; G01R31/36; G01R31/382; G01R31/392; G01R31/396; H01M10/42; H01M10/48
Domestic Patent References:
| WO2017098686A1 | 2017-06-15 |
Foreign References:
| KR20130142884A | 2013-12-30 | |||
| KR20200123658A | 2020-10-30 | |||
| KR20200122111A | 2020-10-27 | |||
| KR20170023583A | 2017-03-06 | |||
| KR20200185703A | 2020-12-29 |
Other References:
See also references of EP 4180826A4
Attorney, Agent or Firm:
PHIL & ONZI INT'L PATENT & LAW FIRM (KR)
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