| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicle wherein an amount of charge or an amount of discharge can be increased and a secondary battery can be effectively used. SOLUTION: The vehicle 1 includes: a chargeable and dischargeable battery B1; a current sensor 11-1 for detecting the current of the battery; and a controller 30 that estimates the state of charge of the battery and controls charge and discharge of the battery based on the state of charge. The controller 30 operates as follows: in a first operation mode in which a cycle of charging and discharging is repeated, it estimates the open-circuit voltage of the battery and determines the state of charge based on a value obtained by correcting the open-circuit voltage based on polarization; and in a second operation mode in which either charging or discharging is continued, it determines the state of charge based on results obtained by totalizing currents detected at the current sensor. COPYRIGHT: (C)2009,JPO&INPIT
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