Secondary cell residual capacity calculation method and battery pack

摘要

A secondary cell residual capacity calculation method, includes the steps of: detecting a temperature of a plurality of secondary cells; detecting a current and a terminal voltage of the plurality of secondary cells; digitizing these temperature, current, and terminal voltage; calculating a cell polarization voltage from the digitized temperature, current and terminal voltage; calculating an original cell voltage from both of the calculated cell polarization voltage and the detected terminal voltage; and calculating a residual capacity rate on the basis of said calculated original cell voltage with reference to a prearranged residual capacity reference data table.