Method and System for Estimating Battery Pack Balance State of New Energy Vehicle

A method and system for estimating a battery pack balance state of a new energy vehicle are provided. The method includes: acquiring an actual cell voltage difference measured for a battery pack of a new energy vehicle, and acquiring one or more operation condition parameters for an operation condition under which the actual cell voltage difference is measured, wherein the actual cell voltage difference is the difference between the maximum and minimum battery cell voltages within the battery pack; determining an expected cell voltage difference according to a model based on the one or more operation condition parameters; determining a compensated cell voltage difference according to the actual cell voltage difference and the expected cell voltage difference; and estimating a battery pack balance state of the new energy vehicle according to the compensated cell voltage difference.