METHOD FOR DETERMINING THE CHARGE STATUS OF A STORAGE BATTERY

摘要

A method comprising a cycle of steps of calculating the depth of discharge (PDDa) of a battery (6) by counting the amounts of electricity (Qi) transmitted or received by the battery and applying to each amount of electricity an efficiency coefficient selected from a plurality of efficiency coefficients (Kx,y, K'x,y); estimating the depth of discharge (PDDu) of the battery on the basis of a measurement of the battery voltage (U) and the current (I) flowing through the battery; comparing the calculated depth of discharge (PDDa) with the estimated depth of discharge (PDDu); and, when the difference between the two depths of discharge (PDDa, PDDu) is greater then a predetermined threshold value (SX), correcting at least part of said efficiency coefficients (Kx,y, K'x,y) in order to bring the calculated depth of discharge (PDDa) closer to the estimated depth of discharge (PDDu). The method is particularly useful for making a battery gauge for an electric motor vehicle.