Patent ID: 6448776
Filing Date: 2002-09-10
Classification: G01R

Abstract:
A method for measuring fitness for use of a storage battery subject to electric loading comprising:a) determining a load profile (current profile I(t) or power profile P(t) as a function of time t, for the storage battery; b) recording an actual voltage response U(t) of the storage battery to the load profile or calculating a voltage response U(t) of the storage battery to the load profile; and c) determining a fitness for use value SOH for the storage battery based on the difference between 1) a lowest or highest voltage value Umin or Umax, respectively, during application of the load profile to the storage battery, and 2) a voltage limiting value U1, wherein U1 is a voltage value which may not be undershot when measuring Umin or overshot when measuring Umax by the voltage U (t) at any time t during which the load profile is applied to the storage battery.