Patent ID: 8102146

Claim:
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.