METHOD AND SYSTEM FOR ESTIMATING STATE OF HEALTH OF BATTERY SET

摘要

A method and a system for estimating the State of Health (SOH) of a battery set are disclosed. The method utilizes a discrete quantization algorithm to estimate the SOH of the battery set, wherein the voltage standard deviations are calculated according to the loop voltages of the battery cells, and comparing the rated discharge capacity with the voltage standard deviations for estimating the SOH of the battery set.

主权项

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; and 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.