Method and device for monitoring the operating state of a battery
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Abstract
In a method for monitoring the operating state of a battery, preferably a Ni metal hydride or a Li-ion battery, formed of consisting of one or several interconnected battery cells, during the charging and discharging of the battery a low-frequency alternating current signal or voltage signal is applied to the battery. The resulting voltage or current signal is measured and the operating state of the battery or its battery cells is determined from at least one change in the harmonic distortion content of the measured voltage or current signal.
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Citations
18 Claims
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1-8. -8. (canceled)
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9. A method for monitoring the operating state of a battery, consisting of one or several interconnected battery cells, comprising the steps of:
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applying a low-frequency alternating current signal or alternating voltage signal during the charging and discharging of the battery, measuring the resulting voltage signal or current signal, and determining the operating state of the battery or said battery cells from at least one change in the harmonic distortion content of the measured voltage signal or current signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. An apparatus for monitoring the operating state of a battery, consisting of one or several interconnected battery cells, wherein the battery is arranged in a circuit which comprises a signal generator for applying a low-frequency alternating current signal or alternating voltage signal to the battery, and wherein an evaluation device is provided for drawing conclusions on the operating state of the battery from at least one change of the harmonic distortion content of the measured voltage signal or current signal.
Specification