Battery state-of-charge estimation method and battery management system

The invention relates to the technical field of batteries, and provides a battery state-of-charge estimation method. The method comprises the following steps: acquiring load current and terminal voltage of a battery; determining the state parameter of the battery by adopting the load current, the terminal voltage and the state parameter of the battery at the last moment and adopting a first extended Kalman filter (EKF) algorithm, wherein the state parameters comprise ohmic internal resistance, polarization internal resistance and polarization capacitance; and determining the state of charge ofthe battery by adopting the load current, the terminal voltage and the state parameter and adopting a second extended Kalman filter (EKF) algorithm. The invention further provides a corresponding battery management system. According to the embodiment provided by the invention, the accuracy of battery state-of-charge estimation can be improved. 本发明涉及电池技术领域，提供了一种电池荷电状态估算方法，所述估算方法包括：获取电池的负载电流和端电压；采用所述负载电流、所述端电压和所述电池上一时刻的状态参