The invention discloses a method for estimating battery health of an electric automobile, which relates to methods for estimating battery health according to
voltage characteristics of a battery charging end. The method solves the defect that battery parameters, such as impedance,
internal resistance and the like, need to be calculated while estimating battery health in the prior art. The method is used for estimating battery health. The method comprises the following steps of: emptying a new battery to be detected, and fully charging the new battery to be detected, and in the fully charging process, recording a
voltage-
time curve and a charge capacity-
time curve of charging of the new battery to be detected; calculating actually
usable capacity Qnew of the new battery to be detected; setting a threshold of V / dQ; calculating the charged capacity of the new battery to be detected from the time when the threshold of dV / dQ is realized to the time when the battery is fully charged during the charging process; building a relation curve of the open-circuit
voltage and SOC (
State Of Charge) of the new battery to be detected; estimating a SOCocv, then, calculating theoretically
usable capacity Qtest-full of the attenuated battery; and obtaining the health of the battery to be detected according to the attenuated theoretically
usable capacity QoId and the actually usable capacity Qnew of the battery.