| 摘要 |
PURPOSE: Provided is a rechargeable lithium ion battery pack, which permits the terminal voltage of unit cells in a battery pack to be measured with ease from the exterior, and shorten the time needed for charging. CONSTITUTION: The lithium ion battery pack comprises a pack positive electrode(14c), pack negative electrode, monitoring electrodes, at least one bare cells and a protection circuit for protecting the overcharge and overdischarge of the cells, in one casing(12). The lithium ion battery pack further comprises: a first field effect transistor whose source is connected to the positive electrodes of the cells connected in series and whose drain is connected to the pack positive electrode(14c); a second field effect transistor whose source is connected to the positive electrodes of the cells connected in series and whose drain is connected to the pack positive electrode(14c); a constant voltage controlling circuit(30) connected to the gate of the first field effect transistor for supplying control signals to the above gate so that the output voltage of the battery pack(10) is maintained at a certain constant voltage; and a charging and monitoring mode setting circuit connected to the gate of the second field effect transistor, which maintains the second transistor in a turn-off state during a discharging mode and in a turn-on state during charging and monitoring modes, thereby connecting the positive electrodes of the cells directly with the pack positive electrode(14c).
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