BATTERY CONTROL APPARATUS, ELECTRIC VEHICLE, AND COMPUTER-READABLE MEDIUM STORING A PROGRAM THAT CAUSES A COMPUTER TO EXECUTE PROCESSING FOR ESTIMATING A STATE OF CHARGE OF A SECONDARY BATTERY
First Claim
1. A battery control apparatus comprising:
- a determination unit configured to determine whether a secondary battery generates a polarization voltage in response to an initiation of power supply from the secondary battery to a load; and
a state-of-charge estimating unit configured to estimate a present state of charge indicating a state of charge of the secondary battery immediately after initiating power supply, if the determination unit determines that the secondary battery generates no polarization voltage,wherein the state-of-charge estimating unit calculates the present state of charge based on a peak battery voltage drop Δ
Vs and a peak discharge current Is, wherein the peak battery voltage drop Δ
Vs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply,wherein the state-of-charge estimating unit sets an initial value based on the estimated present state of charge and estimates a state of charge of the secondary battery based on the initial value as a value effective immediately after initiating power supply.
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Abstract
The present invention can speedily and accurately estimate an SOC of a secondary battery immediately after a charge/discharge operation resumes. A determination unit determines whether a dormant period is longer than a predetermined time in response to an initiation of power supply from a secondary battery to a motor generator. The dormant period is equivalent to the duration from a previous stop of power supply to a present initiation of power supply. If the dormant period is longer than the predetermined time, a state-of-charge estimating unit sets an initial SOC based on a peak battery voltage drop ΔVs and a peak discharge current Is, wherein the peak battery voltage drop ΔVs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply. The state-of-charge estimating unit estimates a state of charge of the secondary battery 30 based on the initial SOC as a value effective immediately after initiating power supply.
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Citations
9 Claims
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1. A battery control apparatus comprising:
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a determination unit configured to determine whether a secondary battery generates a polarization voltage in response to an initiation of power supply from the secondary battery to a load; and a state-of-charge estimating unit configured to estimate a present state of charge indicating a state of charge of the secondary battery immediately after initiating power supply, if the determination unit determines that the secondary battery generates no polarization voltage, wherein the state-of-charge estimating unit calculates the present state of charge based on a peak battery voltage drop Δ
Vs and a peak discharge current Is, wherein the peak battery voltage drop Δ
Vs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply,wherein the state-of-charge estimating unit sets an initial value based on the estimated present state of charge and estimates a state of charge of the secondary battery based on the initial value as a value effective immediately after initiating power supply. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer-readable medium storing a program for causing a computer to perform processing for estimating a state of charge of a secondary battery, the processing comprising:
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determining whether the secondary battery generates a polarization voltage in response to an initiation of power supply from the secondary battery to a load; estimating a present state of charge indicating a state of charge of the secondary battery immediately after initiating power supply, if it is determined that the secondary battery generates no polarization voltage, based on a peak battery voltage drop Δ
Vs and a peak discharge current Is, wherein the peak battery voltage drop Δ
Vs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply;setting an initial value based on the estimated present state of charge; and estimating a state of charge of the secondary battery based on the initial value as a value effective immediately after initiating power supply.
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9. An electric vehicle comprising:
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a motor generator configured to generate a driving power; a secondary battery configured to supply electric power to the motor generator; a determination unit configured to determine whether a dormant period is longer than a predetermined time when the secondary battery initiates power supply to the motor generator in response to a turning-on operation of an ignition switch, wherein the dormant period is equivalent to the duration from a previous stop of the power supply to a present initiation of power supply; and a state-of-charge estimating unit configured to estimate a present state of charge indicating a state of charge of the secondary battery immediately after initiating power supply, if the determination unit determines that the dormant period is longer than a predetermined time, wherein the state-of-charge estimating unit calculates the present state of charge based on a peak battery voltage drop Δ
Vs and a peak discharge current Is, wherein the peak battery voltage drop Δ
Vs represents a difference between a battery voltage Vo measured before initiating power supply and a lowest battery voltage Vs measured after initiating power supply and the peak discharge current Is represents a maximum current value measured after initiating power supply,wherein the state-of-charge estimating unit sets an initial value based on the estimated present state of charge and estimates a state of charge of the secondary battery based on the initial value as a value effective immediately after initiating power supply.
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Specification