Automatic determination of multi-frequency baselines for battery testing
First Claim
1. A method for automatically generating baselines for impedance-based battery testing, the method comprising:
- obtaining individual impedance information for each battery unit in a network of batteries by measuring the response of the battery unit to a defined electrical excitation signal;
calculating an individual-referenced baseline for each battery unit from the individual impedance information;
adjusting the individual-referenced baselines to account for a temperature associated with each respective battery unit, using a microprocessor;
adjusting the individual-referenced baselines to account for a calendar age associated with each respective battery unit; and
calculating a first population-referenced baseline from the individual-referenced baselines as adjusted, for a first point in time.
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Abstract
Baseline values for battery testing are automatically determined for individual batteries, battery cells, or networks of batteries. Impedance information is obtained from individual batteries and adjusted for operating conditions at a site of use (e.g., temperature, age, connection topology and user-entered information). Population-referenced baselines are automatically calculated from the group of individual-referenced baselines. All baselines can be continually updated and improved. The state of charge and state of health characteristics of batteries in the network can be automatically determined by comparison of measured impedance, and other values, to the baselines.
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Citations
18 Claims
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1. A method for automatically generating baselines for impedance-based battery testing, the method comprising:
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obtaining individual impedance information for each battery unit in a network of batteries by measuring the response of the battery unit to a defined electrical excitation signal; calculating an individual-referenced baseline for each battery unit from the individual impedance information; adjusting the individual-referenced baselines to account for a temperature associated with each respective battery unit, using a microprocessor; adjusting the individual-referenced baselines to account for a calendar age associated with each respective battery unit; and calculating a first population-referenced baseline from the individual-referenced baselines as adjusted, for a first point in time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification