SECONDARY BATTERY MANAGEMENT DEVICE, SECONDARY BATTERY MANAGEMENT METHOD, AND STORAGE MEDIUM

A secondary battery management device includes a target setting portion that sets a target charging rate that is a target for a charging rate of a secondary battery mounted in a vehicle, and a target charging rate reaching time that is a time when main charging in which the secondary battery is charged to the target charging rate at a main charging speed is completed; a main charging setting portion that sets a main charging start time when the main charging is started and the main charging speed on the basis of an output of a charger, the target charging rate, and the target charging rate reaching time; at least one of a discharging setting portion that sets a discharging start time when discharging of the secondary battery is started and a discharging speed that is a speed of the discharging, and a sub-charging setting portion that sets a sub-charging start time when sub-charging in which the secondary battery is charged at a sub-charging speed is started and the sub-charging speed; and a charging/discharging execution portion that executes the main charging, the discharging, and the sub-charging in accordance with set details.