Lithium battery SOH estimation method and device

The invention relates to a lithium battery SOH estimation method and device. The method comprises the following steps: charging and discharging a lithium battery to be detected and recording average total discharge time; after the to-be-tested lithium battery is fully charged, performing multiple di...

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Bibliographic Details
Main Authors ZHANG YUPING, WANG XUEQING, SONG HUAWEI, LUO FAN, BIE CHUANYU
Format Patent
LanguageChinese
English
Published 28.11.2023
Subjects
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:The invention relates to a lithium battery SOH estimation method and device. The method comprises the following steps: charging and discharging a lithium battery to be detected and recording average total discharge time; after the to-be-tested lithium battery is fully charged, performing multiple discharging standing operations and multiple charging standing operations on the to-be-tested lithium battery according to the average total discharging time, and recording a charging end voltage and a discharging end voltage; calculating a hysteresis curve area difference according to the discharge end voltage and the charge end voltage; and obtaining an SOH relational expression, and substituting the hysteresis curve area difference into the SOH relational expression for calculation to obtain the SOH value of the lithium battery. According to the method, the battery capacity is equivalent to the average total discharge time, the terminal voltage of multiple times of equal-capacity charging standing and discharging
Bibliography:Application Number: CN202311014847