Patent ID: 6534992
Filing Date: 2003-03-18
Classification: G01R

Abstract:
A method for determining performance of a storage battery comprising:evaluating a time profile of voltage drop in the storage battery by application of a heavy current load; determining a voltage A from voltage response U(t) of the storage battery after switching on the heavy current load; determining a state value A1 from the voltage value A, battery temperature TBAT and state of charge SOC; comparing state value A1 with a preset value A1x which depends at least on associated battery temperature TBAT and associated state of charge SOC of the storage battery, wherein the present value A1a is calculated from comparison values A1T which are determined from the state values A1 for previous heavy current loads applied to the storage battery; and determining performance of the storage battery from the difference between the present value A1x and the state value A1.