SOC estimation method, device, computing device and storage medium

Abstract

The invention relates to a SOC (State of Charge) estimation method, a device, a computing device and a storage medium. The method comprises the steps of: acquiring an initial rated SOC value at a rated capacity at an initial state and an initial true SOC value at a temperature of the initial state; carrying out ampere-hour integration based on the initial rated SOC value, the initial true SOC value to determine a current rated SOC value at the rated capacity of current moment and a current true SOC value at a current temperature; determining a target true SOC value at the current temperature based on the rated capacity, the rated capacity at the current temperature and the current rated SOC value; when the target true SOC value meets a dynamic correction condition, correcting the initial true SOC value based on the target true SOC, and carrying out the ampere-hour integration based on the dynamic corrected initial true SOC value to determine the current true SOC value. According to theSOC estimation method, the device, the computing device and the storage medium, error influence caused by the temperature on an estimated actual available SOC can be reduced, and estimation accuracycan be improved.

Description

technical field [0001] The present application relates to the field of battery technology, in particular to an SOC estimation method, device, computer equipment and storage medium. Background technique [0002] SOC is one of the important parameters that reflect the state of the battery, and can provide a basis for judging the vehicle control strategy. Therefore, accurately judging the SOC of the battery can better manage the charge and discharge of the entire battery pack and ensure the safety of the battery. At present, the methods for estimating the remaining power of the battery are commonly used by the open circuit voltage method and the ampere-hour integral method, in addition to the Kalman filter method and the neural network method. [0003] Among them, when the ampere-hour integration method calculates the SOC of the battery pack, the rated capacity is generally used as the denominator to carry out the integral operation, and the real-time available capacity percent...

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, due to the heating of the battery cells, the entire battery pack will have a certain temperature rise. The temperature is different, and the charging and discharging capacity of the battery pack will have a certain difference. This difference will lead to errors in the calculation of the true usable capacity percentage.

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