Method for determining the state of charge of a battery in charging or discharging phase at constant current
First Claim
1. A method for determining the state of charge of a battery having a preset rated voltage, comprising a charging or discharging phase of the battery at constant current, wherein, in the course of said phase, the method comprises the following successive steps:
- placing the battery in open circuit during a recovery period,applying a constant test voltage to the battery terminals during a preset test period,measuring the current at the end of the test period, anddetermining the state of charge corresponding to said current measured at the end of the test period by means of a calibration curve.
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Abstract
The method for determining the state of charge of a battery can be used during charging or discharging of the battery at constant current. It comprises placing the battery in open circuit during a recovery period until the voltage at the terminals of said battery stabilizes at a voltage plateau. Then a constant test voltage is applied to the battery terminals during a preset test period. The state of charge of the battery corresponds to the current measured at the end of the test period by means of a previously obtained calibration curve.
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Citations
6 Claims
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1. A method for determining the state of charge of a battery having a preset rated voltage, comprising a charging or discharging phase of the battery at constant current, wherein, in the course of said phase, the method comprises the following successive steps:
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placing the battery in open circuit during a recovery period, applying a constant test voltage to the battery terminals during a preset test period, measuring the current at the end of the test period, and determining the state of charge corresponding to said current measured at the end of the test period by means of a calibration curve. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification