Apparatus for estimating open circuit voltage of battery, apparatus for estimating state of charge of battery, and method for controlling the same
First Claim
1. An apparatus for estimating an OCV (Open Circuit Voltage) of a battery, comprising:
- a voltage sensing unit for measuring an output voltage of a battery;
a temperature sensing unit for measuring a temperature of the battery;
a data storing unit for periodically receiving the battery output voltage and the temperature data from the voltage sensing unit and the temperature sensing unit and then storing the battery output voltage and the temperature data in a memory;
an OCV variation estimating unit for calculating an OCV variation from a varying pattern of battery output voltages measured in the past and at the present, stored in the memory, by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation, and then estimating an OCV variation at a current stage by reflecting a correction factor corresponding to the battery temperature on the calculated OCV variation; and
an OCV estimating unit for estimating an OCV of the battery at the current stage by reflecting the estimated OCV variation on the OCV estimated at a last stage.
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Abstract
An apparatus for estimating an OCV of a battery includes a voltage sensing unit for measuring a battery output voltage; a temperature sensing unit for measuring a battery temperature; a data storing unit for periodically receiving the battery output voltage and temperature data from the sensing units and storing the data in a memory; an OCV variation estimating unit for calculating an OCV variation from a varying pattern of battery output voltages measured in the past and at the present, stored in the memory, by applying a mathematical model defining a correlation between the varying pattern and the OCV variation, and estimating an OCV at a current stage by reflecting a correction factor corresponding to the battery temperature on the calculated OCV variation; and an OCV estimating unit for estimating an OCV at the current stage by reflecting the estimated OCV variation on the OCV estimated at a last stage.
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Citations
18 Claims
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1. An apparatus for estimating an OCV (Open Circuit Voltage) of a battery, comprising:
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a voltage sensing unit for measuring an output voltage of a battery; a temperature sensing unit for measuring a temperature of the battery; a data storing unit for periodically receiving the battery output voltage and the temperature data from the voltage sensing unit and the temperature sensing unit and then storing the battery output voltage and the temperature data in a memory; an OCV variation estimating unit for calculating an OCV variation from a varying pattern of battery output voltages measured in the past and at the present, stored in the memory, by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation, and then estimating an OCV variation at a current stage by reflecting a correction factor corresponding to the battery temperature on the calculated OCV variation; and an OCV estimating unit for estimating an OCV of the battery at the current stage by reflecting the estimated OCV variation on the OCV estimated at a last stage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for estimating an OCV of a battery, comprising:
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periodically obtaining output voltage and temperature data of a battery; calculating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation, and estimating an OCV variation at a current stage by reflecting a correction factor corresponding to the battery temperature on the calculated OCV variation; and estimating a battery OCV at the current stage by reflecting the estimated OCV variation on a battery OCV estimated at a last stage.
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9. An apparatus for estimating SOC (State Of Charge) of a battery, comprising:
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a voltage sensing unit for measuring an output voltage of a battery; a temperature sensing unit for measuring a temperature of the battery; a memory storing SOC of each temperature and each OCV; a data storing unit for periodically receiving the battery output voltage and the temperature data from the voltage sensing unit and the temperature sensing unit and then storing the battery output voltage and the temperature data in the memory; an OCV variation estimating unit for calculating an OCV variation from a varying pattern of battery output voltages measured in the past and at the present, stored in the memory, by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation, and then estimating an OCV variation at a current stage by reflecting a correction factor corresponding to the battery temperature on the calculated OCV variation; an OCV estimating unit for estimating an OCV of the battery at the current stage by reflecting the estimated OCV variation on the OCV estimated at a last stage; and a SOC estimating unit for mapping SOC of the battery corresponding to the estimated OCV and the battery temperature from the SOC information of each temperature and each OCV and then outputting the SOC. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for estimating SOC of a battery, comprising:
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storing SOC information of each temperature and each OCV; periodically obtaining output voltage and temperature data of a battery; calculating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation, and estimating an OCV variation at a current stage by reflecting a correction factor corresponding to the battery temperature on the calculated OCV variation; estimating a battery OCV at the current stage by reflecting the estimated OCV variation on a battery OCV estimated at a last stage; and mapping SOC of the battery corresponding to the estimated OCV and the battery temperature with reference to the SOC information of each temperature and each OCV and then outputting the SOC.
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17. A hardware module for estimating an OCV of a battery, which executes:
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a process of calculating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past, stored in a memory, by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation; a process of estimating an OCV variation at a current stage by reflecting a correction factor corresponding to a battery temperature on the calculated OCV variation; and a process of estimating a battery OCV at the current stage by reflecting the estimated OCV variation on a battery OCV estimated at a last stage.
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18. A hardware module for estimating SOC of a battery, which executes:
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a process of calculating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past, stored in a memory, by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation; a process of estimating an OCV variation at a current stage by reflecting a correction factor corresponding to a battery temperature on the calculated OCV variation; a process of estimating a battery OCV at the current stage by reflecting the estimated OCV variation on a battery OCV estimated at a last stage; and a process of mapping SOC corresponding to the estimated OCV and the battery temperature from previously provided SOC information of each temperature and each OCV and then outputting the SOC.
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Specification