Method for estimating battery capacity based on dynamic filter algorithm

An apparatus for estimating battery capacity of a battery, comprising a data sampling module and a data processing module, wherein said data sampling module is coupled to said data processing module;

• wherein said data sampling module is configured to sample a series of voltages across a sensor resistor coupled to said battery when a current flows through said sensor resistor under conditions of default time and default temperature, and recording said voltages as sample voltages, and said data processing module is caused to perform following steps:
• calculating average filtering voltages by filtering white noise in said sample voltages;
• calculating median filtering voltages by removing impulse noise in said average filtering voltages;
• detecting data scope of said median filtering voltages in a data characteristic field;
• calculating low-pass filtering voltages by using a low-pass filter formula according to said median filtering voltages domain in the data characteristic field;
• and
• estimating said battery capacity according to said low-pass filtering voltages.