Method for estimating battery capacity based on dynamic filter algorithm

Abstract

A method for estimating battery capacity of a battery, includes: sampling a series of voltages across a sensor resistor coupled to the battery when a current flows through the sensor resistor under conditions of default time and default temperature, and recording the voltages as sample voltages; calculating average filtering voltages by filtering white noise in the sample voltages; calculating median filtering voltages by removing impulse noise in the average filtering voltages; detecting data scope of the median filtering voltages in the data characteristic filed; calculating low-pass filtering voltages by using a low-pass filter formula according to the median filtering voltages domain in the data characteristic filed; and estimating the battery capacity of the battery according to the low-pass filtering voltages.