Patent ID: 8222862
Filing Date: 2012-07-17
Classification: B60L,Y02T

Abstract:
1. An electrically powered vehicle comprising: a power storage system for supplying an electric power to a drive source; and a charge/discharge control device for charging and discharging said power storage system, wherein said power storage system is formed of a plurality of chargeable and dischargeable power storage units connected in series, said charge/discharge control device includes: a discharging unit for discharging said power storage system with a constant current, and a state-of-charge estimating unit estimating a state of charge of each of said plurality of power storage units, and resetting the states of charge of said plurality of power storage units to reference values according to predetermined timing based on temporal changes in voltage values of said plurality of power storage units during discharging of said power storage system, and said state-of-charge estimating unit sets the respective reference values for said plurality of power storage units based on voltage values and temperatures of said plurality of power storage units exhibited according to said predetermined timing, and resets the states of charge of said plurality of power storage units to said set reference values, respectively.