METHOD AND APPARATUS FOR ESTIMATING BATTERY STATE OF HEALTH

A method and an apparatus for estimating a battery SOH are provided. The method includes: obtaining a partial charge or discharge capacity of a target battery in a SOC interval of each of a plurality of SOCs (S301); separately calculating first dV/dSOC data of each SOC in an mth preset battery capacity based on the mth preset battery capacity and the partial charge or discharge capacity in the SOC interval of each SOC, separately calculating, based on a prestored dV/dSOC characteristic function, second dV/dSOC data corresponding to each SOC, and calculating an mth overall dV/dSOC data deviation of the plurality of SOCs based on the first dV/dSOC data of each SOC in the mth preset battery capacity and the second dV/dSOC data corresponding to each SOC (S302); determining a smallest overall dV/dSOC data deviation from all overall dV/dSOC data deviations corresponding to M preset battery capacities (S303); determining a preset battery capacity corresponding to the smallest overall dV/dSOC data deviation as a retention capacity of an aged target battery (S304); and dividing the retention capacity of the aged target battery by a retention capacity of the target battery in a new battery state, to obtain an SOH of the target battery (S305).