US 2009/0024338 A1 · Remaining-Amount Estimation Device and Method For Secondary Battery

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.

Claims18

Dependent claims

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.

2 more elements

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 relationship between an input/output current of said secondary battery for charging and discharging said secondary battery and said second estimation value.

2 more elements

Dependencies are inferred from the claim text.

Remaining-Amount Estimation Device and Method For Secondary Battery

Life of this patent

Remaining-Amount Estimation Device and Method For Secondary Battery

Life of this patent

Abstract

Claims18