Method for charging and method for determining an end-of-charge criterion of a nickel-based battery
AssigneesCommissariat A L'energie Atomique Et Aux Energies Alternatives, Bubendorff
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.
Claims14
A method for charging an electrochemical nickel-based battery having a predetermined nominal capacity, the method 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, the charging of the battery being stopped when the voltage measured at the terminals of the battery reaches a voltage threshold, the voltage threshold being dependent on the measured temperature such that an increase in the measured temperature from −10° C. to 40° C. decreases the voltage threshold in steps, the voltage threshold being constant in each step, and the voltage threshold being 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 and for charging the electrochemical nickel-based battery, the method comprising the following steps:
- plotting, by a battery charger, an efficiency curve representative of a charging efficiency according to a capacity charged in the battery,
- selecting, by the battery charger, a value of maximum charge capacity corresponding to a break in slope of the efficiency curve,
- plotting, by the battery charger, 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, by the battery charger, from the corresponding voltage curve, for each temperature, a voltage threshold representative of the end-of-charge criterion such that an increase in the temperature from −10° C. to 40° C. decreases the voltage threshold in steps, the voltage threshold being constant in each step, and the voltage threshold corresponding to the value of maximum charge capacity, and
- charging the electrochemical nickel-based battery based on the end of-charge-criterion such that the electrochemical nickel-based battery is charged at the corresponding voltage curve based on a measured temperature of the electrochemical nickel-based battery.
A method for charging an electrochemical nickel-based battery having a predetermined nominal capacity, the method 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, the charging of the battery being stopped when the voltage measured at the terminals of the battery reaches a voltage threshold, the voltage threshold being dependent on the measured temperature such that an increase in the measured temperature from −10° C. to 40° C. decreases the voltage threshold in steps, the voltage threshold being constant in each step on a temperature interval superior or equal to 5° C., and the voltage threshold being 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 and for charging the electrochemical nickel-based battery, the method comprising the following steps:
- plotting, by a battery charger, an efficiency curve representative of a charging efficiency according to a capacity charged in the battery,
- selecting, by the battery charger, a value of maximum charge capacity corresponding to a break in slope of the efficiency curve,
- plotting, by the battery charger, 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, by the battery charger, from the corresponding voltage curve, for each temperature, a voltage threshold representative of the end-of-charge criterion such that an increase in the temperature from −10° C. to 40° C. decreases the voltage threshold in steps, the voltage threshold being constant in each step on a temperature interval superior or equal to 5° C., and the voltage threshold corresponding to the value of maximum charge capacity, and
- charging the electrochemical nickel-based battery based on the end of-charge-criterion such that the electrochemical nickel-based battery is charged at the corresponding voltage curve based on a measured temperature of the electrochemical nickel-based battery.
A method for charging an electrochemical nickel-based battery having a predetermined nominal capacity, the method 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, the charging of the battery being stopped when the voltage measured at the terminals of the battery reaches a voltage threshold, the voltage threshold being dependent on the measured temperature such that an increase in the measured temperature from −10° C. to 40° C. decreases the voltage threshold in steps, the voltage threshold being constant in a first step from 40° C. to 0° C., a second step from 0° C. to −5° C., and a third step from −5° C. to −10° C., and the voltage threshold being 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 and for charging the electrochemical nickel-based battery, the method comprising the following steps:
- plotting, by a battery charger, an efficiency curve representative of a charging efficiency according to a capacity charged in the battery,
- selecting, by the battery charger, a value of maximum charge capacity corresponding to a break in slope of the efficiency curve,
- plotting, by the battery charger, 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, by the battery charger, from the corresponding voltage curve, for each temperature, a voltage threshold representative of the end-of-charge criterion such that an increase in the temperature from −10° C. to 40° C. decreases the voltage threshold in steps, the voltage threshold being constant in a first step from 40° C. to 0° C., a second step from 0° C. to −5° C., and a third step from −5° C. to −10° C., and the voltage threshold corresponding to the value of maximum charge capacity, and
- charging the electrochemical nickel-based battery based on the end of-charge-criterion such that the electrochemical nickel-based battery is charged at the corresponding voltage curve based on a measured temperature of the electrochemical nickel-based battery.
Dependencies are inferred from the claim text.