Secondary-battery management apparatuses, secondary-battery management method, and secondary-battery management program
First Claim
1. A secondary-battery management apparatus in a power supply system which includes a secondary battery as a backup power supply and supplies power to a load, the secondary-battery management apparatus comprising:
- a load device provided separately from the load and connected in parallel to the load;
a battery-data storage section for storing a load current pattern of current flowing through the load and a maximum current, which is the maximum value of current flowing through the load;
a measurement-conditions input section for obtaining discharge timing to discharge the secondary battery by reducing an output of a rectifier, and checking timing to check the capacity of the secondary battery by using the load current pattern;
an arithmetic section for calculating a remaining capacity and a remaining lifetime of the secondary battery in accordance with information on a temperature of the secondary battery in a standby state, in which the secondary battery is not being charged nor discharged, for calculating the remaining capacity of the secondary battery in accordance with information on a measured discharging current from the secondary battery while the secondary battery is in a discharging state, and for calculating the remaining capacity of the secondary battery in accordance with information on a measured charging current to the secondary battery while the secondary battery is in a charging state;
a first control section for judging the reduced capacity of the secondary battery by supplying the load current stored in the battery-data storage section to the load device at the discharge timing to discharge the secondary battery by reducing the output of the rectifier; and
a second control section for calculating the discharge duration of the secondary battery by using the load current pattern stored in the battery-data storage section at the checking timing to check the battery capacity by using the load current pattern.
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Abstract
A secondary-battery management apparatus calculates the possible discharge duration of a secondary battery correctly even after a load current changes. The secondary-battery management apparatus calculates the remaining capacity and the remaining lifetime of the secondary battery in accordance with a measured temperature of the battery in a standby state, calculates the remaining capacity of the battery in accordance with a measured discharging current of the battery while the battery is in a discharging state, and calculates the remaining capacity of the battery in accordance with a measured charging current while the battery is in a charging state. When discharging from the battery is required by means of a reduction of an output voltage of a rectifier, the deterioration of the battery is checked by discharging to a load device. A battery capacity is checked by measuring the discharge duration of the battery in the discharge by the load current pattern.
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Citations
19 Claims
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1. A secondary-battery management apparatus in a power supply system which includes a secondary battery as a backup power supply and supplies power to a load, the secondary-battery management apparatus comprising:
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a load device provided separately from the load and connected in parallel to the load;
a battery-data storage section for storing a load current pattern of current flowing through the load and a maximum current, which is the maximum value of current flowing through the load;
a measurement-conditions input section for obtaining discharge timing to discharge the secondary battery by reducing an output of a rectifier, and checking timing to check the capacity of the secondary battery by using the load current pattern;
an arithmetic section for calculating a remaining capacity and a remaining lifetime of the secondary battery in accordance with information on a temperature of the secondary battery in a standby state, in which the secondary battery is not being charged nor discharged, for calculating the remaining capacity of the secondary battery in accordance with information on a measured discharging current from the secondary battery while the secondary battery is in a discharging state, and for calculating the remaining capacity of the secondary battery in accordance with information on a measured charging current to the secondary battery while the secondary battery is in a charging state;
a first control section for judging the reduced capacity of the secondary battery by supplying the load current stored in the battery-data storage section to the load device at the discharge timing to discharge the secondary battery by reducing the output of the rectifier; and
a second control section for calculating the discharge duration of the secondary battery by using the load current pattern stored in the battery-data storage section at the checking timing to check the battery capacity by using the load current pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A secondary-battery management method for managing a secondary battery, comprising the steps of:
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storing a load current pattern of current flowing through a load and a maximum current flowing through the load;
obtaining discharging timing to discharge the secondary battery by reducing an output of a rectifier and checking timing to check a secondary battery capacity by using the load current pattern;
calculating a remaining capacity and a remaining lifetime of the secondary battery in accordance with information on a temperature of the secondary battery in a standby state, in which the secondary battery is not being charged or discharged, calculating the remaining capacity of the secondary battery in accordance with information on a discharging current from the secondary battery while the secondary battery is in a discharging state, and calculating the remaining capacity of the secondary battery in accordance with information on a charging current to the secondary battery while the secondary battery is in a charging state;
judging the reduced capacity of the secondary battery by supplying the load current to a load device at the discharge timing to discharge the secondary battery by reducing the output of the rectifier; and
calculating the discharge duration of the secondary battery by using the load current pattern at the checking timing to check the capacity of the secondary battery by using the load current pattern. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A computer program for managing a secondary battery, the computer program causing a computer to execute:
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a first step of storing a load current pattern of current flowing through a load and a maximum current, which is the maximum value of current flowing through the load;
a second step of obtaining discharge timing to discharge the secondary battery by reducing an output of a rectifier and checking time to check the capacity of the secondary battery by using the load current pattern;
a third step of calculating a remaining capacity and a remaining lifetime of the secondary battery in accordance with information on a temperature of the secondary battery in a standby state, in which the secondary battery is not being charged or discharged, calculating the remaining capacity of the secondary battery in accordance with information on a discharging current from the secondary battery while the secondary battery is in a discharging state, and calculating the remaining capacity of the secondary battery in accordance with information on a charging current to the secondary battery while the secondary battery is in a charging state;
a fourth step of judging the reduced capacity of the secondary battery by supplying the load current to a load device at the discharging timing to discharge the secondary battery by reducing the output of the rectifier; and
a fifth step of calculating the discharge duration of the secondary battery by using the load current pattern at the checking timing to check the secondary battery capacity by using the load current pattern.
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Specification