Managing an energy storage system by evaluating accuracy of a state of charge of the energy storage system

Abstract

A control device for an energy storage system (ESS) system having an ESS and a battery management system (BMS), and a method for controlling the ESS system are provided. The method includes obtaining an accuracy value indicative of an accuracy of a state of charge (SoC) of the ESS, and, in response to the accuracy value being below a SoC accuracy threshold, a next time the ESS is to be charged or discharged, instructing the ESS to be charged to a full charge level or to be fully discharged, and initiating a SoC calibration of the ESS. The accuracy value may be determined based on one or more SoC parameters comprising an internal resistance, a cell voltage delta, a cell voltage, a rate of change of the cell voltage delta, a charged/discharged capacity in a current cycle, a cycle start Open Circuit Voltage (OCV), a cycle end OCV of the ESS, and an operating time since a last SoC calibration of the ESS.

Dependencies are inferred from the claim text.