| 摘要 |
PURPOSE: To easily perform full charging while preventing overcharging to a secondary battery whose recharging quantity is comparatively small by switching full charging and trickle changing each other on the basis of a battery temperature. CONSTITUTION: A secondary battery pack 2 is connected to a battery charger 1, and when quick charging is started, battery voltage and a battery temperature of a battery 2a are checked by a control circuit 1c. When the battery temperature is normal, quick charging is continued, and when the battery temperature suddenly changes, operation on a temperature differential value is performed in the circuit 1c. When the temperature differential value is not less than a preset value, it is judged as 100% full charged in the quick charging, and it is switched to a trickle charging mode to charge only a self-discharged quantity of the seconday battery 2a. |
