METHOD FOR DYNAMICALLY MEASURING THE STATE OF HEALTH AND CHARGE OF A CAR BATTERY AND DEVICE FOR IMPLEMENTING SAID METHOD

摘要

The method implies measuring the increase in sinusoidal voltage DELTA V=Vmax sen (2 pi ft) by adding a sinusoidal current DELTA I=Imax sen (2 pi ft+ PHI ) to the current of the battery, f being frequency e Imax of the amplitude of the superimposed current, the magnitudes of which are used to calculate the electrochemical impedance of the battery Z(f)=Vmax/Imax e< iota PHI >. The method involves applying a first sinusoidal signal having a predetermined frequency to the battery, which generates an alternating current component superimposed on the direct current; eliminating the direct component of the response signal; applying a second periodic current signal having a frequency that is identical to the first signal and performing synchronous detection of the alternating component generated as a result of applying said first signal in order to obtain a voltage that is proportional to the electrochemical impedance and evaluate the state of health and charge of the battery.