Patent ID: 9411019
Filing Date: 2016-08-09
CPC Classification: G01R

Claim Text:
1. A method for estimating a State of Health (SOH) of a battery set, comprising: a measuring step, for repeatedly measuring a plurality of loop voltages of a plurality of battery cells of the battery set by a plurality of distinct discharge capacities of a predetermined sampling condition; a discretization step, for statistical-distributed-calculating the loop voltages of the battery cells according to a standard deviation formula, to get a plurality of voltage standard deviations, wherein each of the voltage standard deviations corresponding to each of the battery cells; a differential step, for getting a discrete curve according to the discharge capacities and the voltage standard deviations, to calculate a standard-deviation-trough-value of the discrete curve by using a differential formula; an estimating step, for calculating a rated discharge capacity of the battery set and a discharge quantity corresponding to the standard-deviation-trough-value according to a SOH calculating formula, to get the SOH of the battery set; and wherein the SOH calculating formula in the estimating step is k(AH