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 receiving the battery output voltage and the temperature data at time intervals 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 estimating an OCV variation from a varying pattern of battery output voltages measured in the past and at the present and the temperature data, 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 a correction factor corresponding to the batter temperature; 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
19 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 receiving the battery output voltage and the temperature data at time intervals 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 estimating an OCV variation from a varying pattern of battery output voltages measured in the past and at the present and the temperature data, 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 a correction factor corresponding to the batter temperature; 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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obtaining output voltage and temperature data of a battery at time intervals; estimating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past and the temperature data by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation and a correction factor corresponding to the batter temperature; 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 receiving the battery output voltage and the temperature data at time intervals 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 estimating an OCV variation from a varying pattern of battery output voltages measured in the past and at the present and the temperature data, 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 a correction factor corresponding to the batter temperature; 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 estimating SOC of the battery corresponding to the estimated OCV and the battery temperature and then outputting the SOC. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A method for estimating SOC of a battery, comprising:
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storing SOC information of each temperature and each OCV; obtaining output voltage and temperature data of a battery at time intervals; estimating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past and the temperature data by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation and a correction factor corresponding to the batter temperature; 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 by referring to SOC information of each temperature and each OCV and then outputting the SOC.
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18. A hardware module for estimating an OCV of a battery, which executes:
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a process of estimating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past and the temperature data by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation and a correction factor corresponding to the batter temperature; 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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19. A hardware module for estimating SOC of a battery, which executes:
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a process of estimating an OCV variation from a varying pattern of battery output voltages measured at the present and in the past and the temperature data by applying a mathematical model that defines a correlation between the varying pattern of battery output voltages and the OCV variation and a correction factor corresponding to the batter temperature; 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; and a process unit for a SOC estimating unit for estimating SOC of the battery corresponding to the estimated OCV and the battery temperature and then outputting the SOC.
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Specification