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US 9,851,408 B2Granted
Methods and apparatus for battery testing
AssigneeCadex Electronics Inc.
InventorJoern A. Tinnemeyer
Life of this patent
Estimating the term…
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.
Claims16
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 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.
3 more elements
Apparatus for determining a state of an electrochemical battery, the apparatus comprising:
- 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.
6 more elements
Dependencies are inferred from the claim text.