Methods and apparatus for battery testing
First Claim
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1. A method for determining a state of an electrochemical battery, the method comprising:
- exposing an electrode of the electrochemical battery to an electromagnetic excitation field;
measuring magnetism induced in the material of the electrode by the electromagnetic excitation field; and
determining the state of the electrochemical battery based at least in part on the measured induced magnetism;
wherein the method comprises causing the electromagnetic excitation field to vary at a frequency and discontinuing the electromagnetic excitation field before measuring the induced magnetism andvarying the frequency at which the excitation field varies and identifying a transition frequency, the transition frequency corresponding to a highest frequency at which the magnetic field component of the electromagnetic excitation field fully penetrates the electrode being monitored.
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Abstract
Methods and apparatus for testing electrical storage batteries monitor magnetic susceptibility of components of the storage batteries. In some embodiments, magnetic susceptibility of a plate in a lead-acid battery is determined to provide an indication of the state of charge of the battery.
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Citations
16 Claims
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1. A method for determining a state of an electrochemical battery, the method comprising:
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exposing an electrode of the electrochemical battery to an electromagnetic excitation field; measuring magnetism induced in the material of the electrode by the electromagnetic excitation field; and determining the state of the electrochemical battery based at least in part on the measured induced magnetism; wherein the method comprises causing the electromagnetic excitation field to vary at a frequency and discontinuing the electromagnetic excitation field before measuring the induced magnetism and varying the frequency at which the excitation field varies and identifying a transition frequency, the transition frequency corresponding to a highest frequency at which the magnetic field component of the electromagnetic excitation field fully penetrates the electrode being monitored. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for determining a state of an electrochemical battery, the apparatus comprising:
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an excitation field generator configured to apply an electromagnetic excitation field to an electrode of the electrochemical battery; a magnetic field detector positionable to determine an induced magnetization induced in the material of the electrode by the excitation field; and
,a controller configured to determine the state of the electrochemical battery based at least in part on the induced magnetization wherein the controller is configured to; cause the electromagnetic excitation field to vary at a frequency; discontinue application of the electromagnetic excitation field before measuring the induced magnetism; and vary the frequency at which the excitation field varies and identify a transition frequency, the transition frequency corresponding to a highest frequency at which the magnetic field component of the electromagnetic excitation field fully penetrates the electrode being monitored. - View Dependent Claims (12, 13, 14, 15, 16)
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Specification