METHOD AND SYSTEM FOR ESTIMATING STATE OF HEALTH OF BATTERY, AND DEVICE AND MEDIUM

A method and system for estimating the state of health of a battery, and a device and a medium. The method comprises: acquiring charging data of each battery cell in a plurality of charging segments within a preset time period, wherein each charging segment corresponds to a continuous charging time period (S300); determining, according to the charging data, a first relational expression between a state of charge and an electromotive force in a corresponding charging segment (S310); constructing a target loss function according to the first relational expression and a preset second relational expression between the state of charge and the electromotive force, and performing optimization according to the target loss function to obtain an optimal rechargeable electric quantity of a charging segment corresponding to the minimum target loss function (S320); and determining the current state of health of a battery pack according to the optimal rechargeable electric quantity of each charging segment, wherein the bat