Battery health state estimation method and system based on charging segment

The invention provides a battery health state estimation method and system based on a charging fragment, and the method comprises the steps: obtaining the circulation aging data of an energy storage battery under a constant-current and constant-voltage charging strategy and a constant-current discharging strategy, and extracting the voltage-charging amount data of a constant-current charging stage in each circulation; based on the voltage-charging amount data, dividing a plurality of voltage segments according to a voltage range and charging time, and extracting health factors of the voltage segments; constructing a mapping relation model of the health factors and the battery health state; and extracting a voltage fragment according to actual charging data, calculating a corresponding health factor, and determining a current battery health state according to the constructed mapping relation model. According to the method, the charging amounts in charging fragments of different cycles are used as health factor