Remaining-Amount Estimation Device and Method For Secondary Battery
First Claim
1. A remaining-amount estimation device for a chargeable secondary battery, comprising:
- a first estimation unit calculating a first estimation value for a remaining amount of said secondary battery based on a charging/discharging amount of said secondary battery from a time of a last remaining-amount estimation;
a second estimation unit calculating a second estimation value for the remaining amount of said secondary battery based on a state value of said secondary battery; and
a correction unit correcting said first estimation value based on a correction value in accordance with a deviation of a last calculated value of the remaining amount from said second estimation value, the last calculated value of the remaining amount being a remaining-amount estimation value of said secondary battery estimated at the time of the last remaining-amount estimation, and generating the remaining-amount estimation value of said secondary battery,said correction unit calculating said correction value based on a magnitude of said last calculated value of the remaining amount and a magnitude relationship between said last calculated value of the remaining amount and said second estimation value.
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Abstract
An SOC-estimation-value-depending gain selection unit multiplies the deviation of an SOC estimation value (last calculated value) relative to an estimated SOC by a correction gain G1 to calculate a correction value. The SOC-estimation-value-depending gain selection unit selects a relatively small correction gain G1 when the SOC estimation value lies in the range in proximity to excessive charging and the SOC estimation value is corrected to a smaller value (toward the SOC control center), and when the SOC estimation value lies in the range in proximity to excessive discharging and the SOC estimation value is corrected to a larger value (toward the SOC control center). Thus, the correction is performed so as to indicate the safe side value for the secondary battery in charge/discharge control when the SOC estimation value is in proximity to excessive charging or excessive discharging.
33 Citations
18 Claims
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1. A remaining-amount estimation device for a chargeable secondary battery, comprising:
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a first estimation unit calculating a first estimation value for a remaining amount of said secondary battery based on a charging/discharging amount of said secondary battery from a time of a last remaining-amount estimation; a second estimation unit calculating a second estimation value for the remaining amount of said secondary battery based on a state value of said secondary battery; and a correction unit correcting said first estimation value based on a correction value in accordance with a deviation of a last calculated value of the remaining amount from said second estimation value, the last calculated value of the remaining amount being a remaining-amount estimation value of said secondary battery estimated at the time of the last remaining-amount estimation, and generating the remaining-amount estimation value of said secondary battery, said correction unit calculating said correction value based on a magnitude of said last calculated value of the remaining amount and a magnitude relationship between said last calculated value of the remaining amount and said second estimation value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 12, 13, 14, 15, 16)
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8. A remaining-amount estimation device for a chargeable secondary battery, comprising:
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a first estimation unit calculating a first estimation value for a remaining amount of said secondary battery based on a charging/discharging amount of said secondary battery from a time of a last remaining-amount estimation; a second estimation unit calculating a second estimation value for the remaining amount of said secondary battery based on a state value of said secondary battery; and a correction unit correcting said first estimation value based on a correction value in accordance with a deviation of a last calculated value of the remaining amount from said second estimation value, the last calculated value of the remaining amount being a remaining-amount estimation value of said secondary battery estimated at the time of the last remaining-amount estimation, and generating the remaining-amount estimation value of said secondary battery, said correction unit calculating said correction value based on a relationship between an input/output current of said secondary battery for charging and discharging said secondary battery and said second estimation value. - View Dependent Claims (9, 10, 11)
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17. A remaining-amount estimation method for a chargeable secondary battery, comprising the steps of:
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calculating a first estimation value for a remaining amount of said secondary battery based on a charging/discharging amount of said secondary battery from a time of a last remaining-amount estimation; calculating a second estimation value for the remaining amount of said secondary battery based on a state value of said secondary battery; and correcting said first estimation value based on a correction value in accordance with a deviation of a last calculated value of the remaining amount from said second estimation value, the last calculated value of the remaining amount being a remaining-amount estimation value of said secondary battery estimated at the time of the last remaining-amount estimation, and generating the remaining-amount estimation value of said secondary battery, in the generation of the remaining-amount estimation value of said secondary battery, said correction value being calculated based on a magnitude of said last calculated value of the remaining amount and a magnitude relationship between said last calculated value of the remaining amount and said second estimation value.
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18. A remaining-amount estimation method for a chargeable secondary battery, comprising the steps of:
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calculating a first estimation value for a remaining amount of said secondary battery based on a charging/discharging amount of said secondary battery from a time of a last remaining-amount estimation; calculating a second estimation value for the remaining amount of said secondary battery based on a state value of said secondary battery; and correcting said first estimation value based on a correction value in accordance with a deviation of a last calculated value of the remaining amount from said second estimation value, the last calculated value of the remaining amount being a remaining-amount estimation value of said secondary battery estimated at the time of the last remaining-amount estimation, and generating the remaining-amount estimation value of said secondary battery, in the generation of the remaining-amount estimation value of said secondary battery, said correction value being calculated based on a relationship between an input/output current of said secondary battery for charging and discharging said secondary battery and said second estimation value.
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Specification