PORTABLE INFORMATION DEVICE, AND CHARGE STATE OPTIMIZATION METHOD AND PROGRAM THEREFOR, AS WELL AS BATTERY MANAGEMENT SERVER, AND CHARGE STATE OPTIMIZATION METHOD AND PROGRAM FOR BATTERY TYPE ELECTRIC DEVICE THEREBY

摘要

PROBLEM TO BE SOLVED: To provide a battery type electric appliance reducing a user's burden concerning optimization of a charge state of a secondary battery to certainly make maintenance of a long service life of the secondary battery compatible with maximum practical use of battery capacity, and to provide a charge state optimization method therefor.

SOLUTION: A schedule record part 4 records a user's schedule. An SOC (charge state) optimization plan part 5 plans an SOC of the secondary battery 21 on the basis of the user's schedule. The planned control target SOC is optimized by comparing and considering a continuous charging characteristic of the secondary battery 21, and electric power or an operable time to be secured in the case of battery drive. For example, the control target SOC is set to a full charge state in the vicinity of a period wherein a long operation time by the battery drive is estimated, while the control target SOC is set to a sufficiently smaller charge state than the full charge state in a period wherein long-term connection to an external power source A by an AC adapter 11 is estimated. A power source control part 3 controls charging/discharging of the secondary battery 21 according to the optimization plan concerning the SOC.

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