Method and device for determining the charge of a battery
First Claim
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1. A method for determining a state-of-charge of a battery, comprising the steps of evaluating a transition frequency (f±
- ) of an impedance for a battery, which is excited by an alternating current, and assigning the transition frequency to the state-of-charge of the battery, wherein the transition frequency is a frequency of the alternating current at which the imaginary part of the impedance of the battery vanishes.
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Abstract
A method and device for determining the charge of a battery, characterized in that a gain crossover frequency (f±) for an impedance of the battery excited by an alternating current signal is established, and the gain crossover frequency (f±) is assigned to the charge of the battery, whereby the gain crossover frequency (f±) is a frequency of the alternating current signal at which an imaginary portion of the impedance of the battery vanishes. Method and device for determining the state-of-charge of a battery
57 Citations
28 Claims
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1. A method for determining a state-of-charge of a battery, comprising the steps of evaluating a transition frequency (f±
- ) of an impedance for a battery, which is excited by an alternating current, and assigning the transition frequency to the state-of-charge of the battery, wherein the transition frequency is a frequency of the alternating current at which the imaginary part of the impedance of the battery vanishes.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
- 14. A device for determining a state-of-charge of a battery, comprising an element for determining a transition frequency of an impedance of a battery, which is excited by an alternating current, and a calculation unit for assigning the transition frequency to the state-of-charge of the battery, where the transition frequency is a frequency of the alternating current at which the imaginary part of the impedance of the battery vanishes.
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20. The device according to wherein the element for determining of the transition frequency comprises a control unit, which scrutinizes the phase difference and modifies a transmitted frequency of the frequency filter and/or a frequency of the alternating current source, till the phase difference is null.
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