| 摘要 |
<p>In a system wherein a rechargeable battery is charged when power consumption is light, and power is discharged from the rechargeable battery when power consumption is heavy, the life span of the rechargeable battery is made to be longer. An estimation unit (140) estimates the amount of power consumption for each unit period of time. A rechargeable battery control unit (150) controls the rechargeable battery (200) such that an exceeding amount of power worth the amount of power exceeding a target amount of power during a unit period of time is charged into the rechargeable battery (200), and power is discharged from the rechargeable battery (200) during a time zone wherein the target amount of power is exceeded, on the basis of the result of the estimation conducted by the estimation unit (140). An upper-limit value for the amount of power to be charged in contrast to the full amount of power that can be charged into the rechargeable battery (200) is set in the rechargeable battery control unit (150). When the rechargeable battery (200) needs to be charged in excess of the upper-limit value, the rechargeable battery control unit (150) charges the rechargeable battery up to the upper-limit value during a time zone wherein the amount of power consumption estimated by the estimation unit (140) is light, and the amount of power that exceeds the upper-limit value is charged during a time zone that is close to the time zone wherein the target amount of power is exceeded.</p> |
