Device and method for judging deterioration of accumulator / secondary cell

摘要

A method for determining deterioration of accumulator battery based on results of measuring internal resistances of an accumulator battery and an apparatus adapted to perform said method: Internal resistance and temperature are measured and an approximation function of the temperature characteristic with cubic or higher order polynomial terms is determined and used for determining specific internal resistance at predetermined temperature. Determining deterioration of secondary battery is based on said specific internal resistance.