State monitoring method and system for power battery of electric vehicle and electric vehicle

The invention provides a state monitoring method and system for a power battery of an electric vehicle and the electric vehicle, and the method comprises the steps: obtaining terminal voltage information, current information and temperature information of the power battery in a charging and discharging state based on a battery management system, and determining the state of charge of the power battery through a pre-constructed fusion model; determining the battery equivalent internal resistance of the power battery through a pre-established battery circuit model according to the distribution rule of the terminal voltage information and the current information; and determining the battery health state through a battery health state estimation algorithm according to the battery charge state and the battery equivalent internal resistance. According to the method, the battery charge state and the battery health state of the power battery can be accurately determined at the same time. 本发明提供一种电动汽车动力电池的状态监控方法、系统及电动汽