Battery capacity equalization difference calculation method of battery system and related equipment

The invention discloses a battery capacity balance difference calculation method and device of a battery system, electronic equipment and a computer readable storage medium, the battery system comprises a plurality of batteries connected in series, and the method comprises the following steps: obtaining charging state data of each battery in a charging process of the battery system; calculating an open-circuit voltage value Vend of each battery at the end of charging; the batteries with Vend smaller than Vth2 are identified as the first kind of batteries; [Vth1, Vth2] is a capacity fading significant change interval of batteries of the same model; calculating a first charge capacity value during [Vth1, Vend] for the first type of batteries; taking a difference value between the standard charging capacity value and the first charging capacity value as a capacity balance characteristic value of the first type of batteries; and calling a first equalization difference value identification model, and determining a