Battery state of charge rolling optimization estimation method and device

The invention provides a rolling optimization estimation method and device for the state of charge (SOC) of a battery, and the method comprises the steps: S1, determining an initial estimation value of the SOC of the battery according to the open-circuit voltage of the battery, carrying out the real-time estimation of the SOC in a discharging process according to an ampere-hour measurement method, obtaining a first estimation value of the SOC, and recording the variable quantity of the first estimation value of the SOC; s2, when the variable quantity of the SOC first estimation value reaches a preset variable quantity, calculating a battery discharge external characteristic area # imgabs0 # under the current SOC first estimation value, and performing # imgabs2 # matching according to a # imgabs1 #-SOC piecewise fitting function to obtain an SOC second estimation value; s3, taking an average value of the current SOC first estimation value and the current SOC second estimation value as a rolling optimization va