| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the inability of discharging large current at low temperature and to prevent the deterioration of a battery that is left unused for a long time. SOLUTION: This power supply has a cell-temperature detecting means 5. If the cell temperature is equal to or lower than a specified temperature when the cell discharges a current to an external host appliance, preliminary discharging or preliminary charging or preliminary charging and discharging is repeated between a main battery pack 1 and an auxiliary battery pack 6 through a DC-DC converter 10 until the cell temperature exceeds a specified value or internal impedance becomes a specified value or lower than it, before the discharging to the appliance is started. Also, a means is provided for measuring the elapsed time of the charging or discharging. By setting a specified value based on the average value of temperatures during the measurement of the elapsed time, the preliminary discharging or preliminary charging or preliminary charging and discharging is performed if the elapsed time is equal to or longer than the specified value or if the temperature during the measurement of the elapsed time is equal to or higher than the specified value and continues for a specified period of time.
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