BATTERY PACK DIAGNOSING METHOD, CELL DIAGNOSING METHOD, BATTERY PACK DIAGNOSING DEVICE, AND CELL DIAGNOSING DEVICE

WIPO Patent Application WO/2022/024885

A1

This method for diagnosing a battery pack having a configuration in which a plurality of cells are connected in series, using a system for obtaining detected data including the current and temperature of the battery pack and the voltage of each cell, includes: a step of calculating an electric charge capacity and a state of charge (SOC) of each cell, using the current and the temperature, the voltage of each cell, an open circuit voltage (OCV) - SOC function, and an OCV - resistance table, and calculating an amount of unbalance, which is an estimated value of the SOC, and the resistance for each cell when the battery pack is fully charged; and a step of calculating the energy capacity of the battery pack using the electric charge capacity, the amount of unbalance, and the resistances. As a result, the energy capacity of the battery pack can be calculated accurately, even in an unbalanced state.

INOUE TAKESHI (JP)
HIRASAWA SHIGEKI (JP)
ISHIMARU TETSUYA (JP)
HONKURA KOHEI (JP)
MAKINO SHIGEKI (JP)
KAWAJI JUN (JP)

PCT/JP2021/027197

February 03, 2022

July 20, 2021

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HITACHI HIGH TECH CORP (JP)

H01M10/48; B60L3/00; B60L53/10; B60L58/12; B60L58/16; G01R31/382; G01R31/385; G01R31/387; G01R31/389; G01R31/392; G16Y10/40; G16Y20/20; G16Y40/20; H02J7/00; H02J7/02; H02J7/04; H02J7/10

WO2017199629A1	2017-11-23
WO2016075797A1	2016-05-19

JP2019049412A	2019-03-28
JP2020038812A	2020-03-12
JP2009210284A	2009-09-17

TAKEHIKO KISHINE ET AL.: "Memory-restricted quasi-Newton method with sizing , effect", JAPAN OPERATIONS RESEARCH SOCIETY, AUTUMN CONFERENCE, 2001
HIROSHI TAKEUCHI ET AL.: "Statistics Dictionary", 20 August 2015, TOYO KEIZAI IRIC

POLAIRE I.P.C. (JP)

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