METHODS FOR ESTIMATING STATE OF CHARGE OF BATTERY AND BATTERY PACK, AND BATTERY MANAGEMENT SYSTEM, BATTERY AND ELECTRIC CAR USING METHODS FOR ESTIMATING STATE OF CHARGE

摘要

Provided is a method for estimating a state of charge of a battery. The method comprises: monitoring a current of a battery; when the current is 0, recording a terminal voltage of the battery; building a relationship model between two terminal voltages respectively corresponding to any two consecutive recording times; using recursive least squares algorithm to calculate an open-circuit voltage; and determining a state of charge of the battery according to the open-circuit voltage. Further provided are a method for estimating a state of charge of a battery pack, and a battery management system, a battery and an electric car using the estimation methods. The solution of the present invention has the advantages of short waiting time, high estimation accuracy, low calculation complexity, easy application, and no need for additional hardware, etc.