Patent ID: 6329823
Filing Date: 2001-12-11
Classification: G01R

Abstract:
A process for monitoring the residual charge and the capacity of a load-carrying battery in a battery system with a limiting voltage level (U.sub.Gr) and a minimum current (I.sub.min) where:at least at an initial time (T.sub.1), at least an initial voltage-current-measurement is carried out for an initial load condition of the battery and at least an initial measuring point (M.sub.1) is determined, at least at a second different time (T.sub.2), at least a second voltage-current measurement is carried out for a second load condition of the battery and at least a second measuring point (M.sub.2) is determined,the measuring points (M.sub.1 and M.sub.2) are always determined at a load condition of the battery that is greater than 30% of the nominal capacity per hour (K.sub.N /h),the measuring points (M.sub.1 and M.sub.2) set a mean curve (3), and the point of intersection (S.sub.3) of the mean curve with the limiting voltage level (U.sub.Gr) is determined and the associated limiting current (I.sub.Gr) is determined, andthe differences between the limiting current (I.sub.Gr) and the minimum current (I.sub.min) determines a limiting current reserve as the dimension for the residual charge available in the battery.