Patent ID: 8306781

Claim:
A professional diagnosis method of battery performance analysis comprising the steps of: measuring parameters of a battery set with two or more batteries by a measuring device, the parameters including maximum voltage of each battery in an equalized charge period, minimum voltage of each battery in an equalized charge period, float voltage dispersion ratio of a single battery, float voltage dispersion ratio of the battery set, battery conductance at end of a discharge r(i), voltage of each battery at end of a short-term discharge, voltage difference and temperature of each battery during a short-term charge and discharge; then inputting the parameters to an artificial neural network including a computer which calculates and outputs predicted battery performance and gives relevant operating advices; wherein said float voltage dispersion ration of a single battery is calculated by equation (3): μ i = 1 n ⁢ ∑ j = 1 n ⁢ ⁢ U ij , Δ ⁢ ⁢ U ij = ∑ j = 1 n ⁢  U ij - μ i  ( 3 ) the float voltage dispersion ratio of the battery set is calculated by equation (4): μ j = 1 num ⁢ ∑ i = 1 num ⁢ ⁢ U ij , Δ ⁢ ⁢ U ij ′ = ∑ i = 1 num ⁢  U ij - μ j  ( 4 ) where: U ij : the voltage of the battery i at the moment j; n: sample period; μ i : average float charge voltage of the batter i in sample period n; μ j : average float charge voltage of batter set at the moment j; num: the number of battery set; ΔU ij : float voltage dispersion ratio of single battery; and ΔU ij ′: float voltage dispersion ratio of batter set.