Contemporary Amperex Technology Co., Ltd.

Jiangsu Contemporary Amperex Technology Limited

Li Tan

Yanhua Lu

Wei Zhang

Shichao Li

Mingshu Du

Shenzhi Tang

Yushuai Shi

Nana Xiong

Chenlin Yang

Qifan Zou

This application describes a battery equalization method and device, and a battery management system. The battery equalization method includes: obtaining a first closed circuit voltage of N cells in a duration of a pulse charge current and a second closed circuit voltage of the N cells in a duration of a pulse discharge current, where the N cells constitute a battery, and N is a positive integer; determining a relationship of SOC values between the N cells based on the first closed circuit voltage and the second closed circuit voltage; and performing charge equalization on target cells, where the target cells are determined from the N cells based on the relationship of SOC values.

Battery equalization method and device, and battery management system with closed circuit voltage measurements obtained by charging and discharging pluses

The present application provides a method and apparatus for correcting a state of charge. The method for correcting a state of charge comprises: determining an operating state of a battery cell, wherein the operating state comprises a discharging state or a charging state; and determining a corrected state of charge of the battery cell according to an acquired current open circuit voltage of the battery cell, an acquired current accumulative capacity of the battery cell, an accumulative capacity correspondence relationship corresponding to the operating state of the battery cell, and an open circuit voltage curve corresponding to a limit initial state of charge, wherein the accumulative capacity correspondence relationship comprises a correspondence relationship between a pre-measured open circuit voltage and an accumulative capacity threshold. A technical solution of the present application can be used to improve the accuracy of calculation of a state of charge.

Method and apparatus for correcting state of charge

A method and an apparatus for calculating the SOC of a battery being charged and a battery pack including the apparatus are disclosed in the present disclosure. The method for calculating the SOC includes: obtaining a full charge voltage and a reference charging voltage curve of the battery; taking a voltage value from the approximately linear ascent stage of the reference charging voltage curve as a preset reference voltage, and obtaining a corresponding reference SOC; acquiring a current charging voltage at which a charging voltage curve corresponding to a current charging state of the battery enters into an approximately linear ascent stage; determining a compensation factor according to the preset reference voltage, the full charge voltage, and the current charging voltage; and utilizing the compensation factor and the reference SOC to calculate a current SOC corresponding to the current charging state of the battery.

Method and apparatus for calculating SOC of a battery being charged and battery pack including the apparatus

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Ningde, China

Li Tan