Method for determining the performance of a storage battery
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United States of America Patent
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Mar 18, 2003
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app pub date -
Feb 7, 2002
filing date -
Feb 17, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
A method for determining performance of a storage battery including 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 T.sub.BAT and state of charge SOC, comparing state value A1 with a preset value A1.sub.x which depends at least on associated battery temperature (T.sub.BAT) and associated state of charge (SOC) of the storage battery, wherein the present value A1.sub.x is calculated from comparison values A1.sub.T 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 A1.sub.x and the state value A1.
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