| 摘要 |
A state-of-charge estimation device includes a transition estimation unit, when a transition from a charge mode to a discharge mode starts, which starts current integration by use of a measured current and obtains a second state of charge by use of a first state of charge at the start of the transition and a current integration value, so as to estimate that the second state of charge is a state of charge upon transition until a target state of charge is reached that is determined by a current integration value obtained for a predetermined time period after the start of the transition, and/or when a transition from a discharge mode to a charge mode starts, which starts current integration by use of a measured current and obtains a sixth state of charge by use of a third state of charge at the start of the transition and a current integration value. |
| 主权项 |
1. A state-of-charge estimation device comprising:
a voltage measuring unit configured to measure a voltage in a battery; a current measuring unit configured to measure a current charged to and discharged from the battery; a charge estimation unit, in a charge mode, configured to refer, by use of a measured closed circuit voltage, to charge mode information that associates a closed circuit voltage with a first state of charge in the battery when charging is performed by a charger, and to obtain the first state of charge, so as to estimate that the first state of charge is a state of charge upon charging; a transition estimation unit, when a transition from the charge mode to a discharge mode starts, configured to start current integration by use of the measured current, and to obtain a second state of charge by use of the first state of charge at the start of the transition and a current integration value, so as to estimate that the second state of charge is a state of charge upon transition until a target state of charge is reached that is determined by a current integration value obtained for a predetermined time period after the start of the transition; and a discharge estimation unit, when the discharge mode starts after the transition is over, configured to refer, by use of the measured closed circuit voltage, to discharge mode information that associates a closed circuit voltage generated by use of a discharge pattern of the battery obtained by operating a vehicle in a predetermined operation pattern with a third state of charge in the battery, and to obtain the third state of charge, so as to estimate that the third state of charge is a state of charge upon discharging. |
