Method for charging and method for determining an end-of-charge criterion of a nickel-based battery
AssigneesBubendorff, Commissariat A L'energie Atomique Et Aux Energies Alternatives
InventorsDavid Brun-Buisson, Antoine Labrunie, Pierre Perichon
Life of this patent
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Abstract
The method for charging an electrochemical nickel-based battery having a predetermined nominal capacity, including at least one measurement of the voltage of the battery and one measurement of the temperature representative of the battery. The battery is connected to an intermittent source of energy. The charging of the battery is stopped when the voltage measured at the terminals of the battery reaches a voltage threshold, depending on the measured temperature and representative of a capacity charged in the battery corresponding to a charging efficiency equal to or higher than 90% of the maximum charging efficiency.
Claims10
1-9. (canceled)
A method for charging an electrochemical nickel-based battery having a predetermined nominal capacity, comprising the following steps:
- measuring a battery voltage at terminals of the battery;
- measuring a temperature representative of the battery,
- charging the battery with an intermittent and variable-current source of energy, said charging of the battery being stopped when the voltage measured at the terminals of the battery reaches a voltage threshold, said voltage threshold depending on the measured temperature and representative of a capacity charged in the battery corresponding to a charging efficiency equal to or higher than 90%.
A method for determining an end-of-charge criterion of an electrochemical nickel-based battery comprising the following steps:
- plotting an efficiency curve representative of a charging efficiency according to a capacity charged in the battery,
- selecting a value of maximum charge capacity corresponding to a break in slope of the efficiency curve,
- plotting at least one voltage curve representative of a battery voltage according to the charged capacity, for a given temperature representative of a battery temperature,
- determining from the corresponding voltage curve, for each temperature, a voltage threshold representative of the end-of-charge criterion, corresponding to said value of maximum charge capacity.
Dependencies are inferred from the claim text.