CONTROL DEVICE OF SECONDARY BATTERY AND MAP CORRECTION METHOD
First Claim
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1. A control device for a secondary battery, comprising:
- a unit which obtains a voltage index of a secondary battery which is equipped as an electric power supply source;
a storage unit which stores in advance a relationship between the voltage index and an SOC of the secondary battery;
a unit which obtains a relationship between the voltage index and the SOC reflecting a current state of the secondary battery; and
a correcting unit which corrects the relationship based on an amount of change of the obtained voltage index from an initial state, the correcting unit correcting the relationship stored in the storing unit using not only data obtained from the secondary battery, but also data obtained by statistically processing a plurality of the relationships corresponding to the amount of change among a plurality of the relationships obtained from a plurality of other secondary batteries equipped as electric power supply sources.
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Abstract
A two-dimensional map for calculating an SOC of a secondary battery is corrected. A battery ECU obtains a voltage index of a secondary battery. The voltage index is, for example, a no-load voltage of the secondary battery. When an amount of change of the calculated no-load voltage from an initial state falls outside a predefined range, the battery ECU corrects the two-dimensional map of initial state which is stored in advance in a storage unit using data obtained by statistically processing a plurality of two-dimensional maps obtained from a plurality of vehicles.
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Citations
18 Claims
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1. A control device for a secondary battery, comprising:
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a unit which obtains a voltage index of a secondary battery which is equipped as an electric power supply source; a storage unit which stores in advance a relationship between the voltage index and an SOC of the secondary battery; a unit which obtains a relationship between the voltage index and the SOC reflecting a current state of the secondary battery; and a correcting unit which corrects the relationship based on an amount of change of the obtained voltage index from an initial state, the correcting unit correcting the relationship stored in the storing unit using not only data obtained from the secondary battery, but also data obtained by statistically processing a plurality of the relationships corresponding to the amount of change among a plurality of the relationships obtained from a plurality of other secondary batteries equipped as electric power supply sources. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 12, 13, 14)
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9. A control device for a secondary battery, comprising:
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a unit which obtains a voltage index of a secondary battery which is equipped on a vehicle; a storage unit which stores in advance a relationship between the voltage index and an SOC of the secondary battery; a unit which obtains a relationship between the voltage index and the SOC reflecting a current state of the secondary battery; and a correcting unit which corrects the relationship stored in the storage unit using corresponding data, for each category of running distance, among data obtained by statistically processing a relationship between an amount of change of the voltage index from an initial state and the SOC. - View Dependent Claims (10, 11)
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15. A method of correcting a map which defines a relationship between a voltage index and an SOC of a secondary battery which is stored in advance in a storage unit for calculating the SOC of the secondary battery, the method comprising:
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obtaining the voltage index by charging/discharging the secondary battery according to a predetermined pattern; judging whether or not an amount of change of the obtained voltage index from an initial state falls within a predefined range; and correcting, when the amount of change falls outside the predefined range, the relationship stored in the storage unit using not only data obtained from the secondary battery, but also data obtained by statistically processing a plurality of the relationships corresponding to the amount of change among a plurality of the relationships obtained from a plurality of other secondary batteries. - View Dependent Claims (16, 17, 18)
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Specification