Contemporary Amperex Technology Co., Ltd.

Yushuai Shi

Yanhua Lu

Qiang Yun

Li Tan

Nana Xiong

A method and device for estimating remaining available energy of a power battery is provided. The method includes: estimating, under current state, maximum available energy of a first cell with minimum State of Charge (SOC), and maximum available energy of a second cell with minimum of maximum available capability in the power battery; estimating remaining available energy of the first cell based on its maximum available energy and SOC, and estimating remaining available energy of the second cell based on its maximum available energy and SOC; and estimating the remaining available energy of the power battery based on the number of cells included in the power battery and the smaller one of the remaining available energy between the first and the second cell.

Method and device for estimating remaining available energy of a power battery

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.

Growing community of inventors

Ningde, China

Yushuai Shi