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BATTERY PACK

  • US 20080111520A1
  • Filed: 10/23/2007
  • Published: 05/15/2008
  • Est. Priority Date: 11/14/2006
  • Status: Active Grant
First Claim
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1. A battery pack comprising:

  • a secondary battery;

    a measurement unit for measuring a terminal voltage and a current of the secondary battery;

    a protection unit for preventing the secondary battery from being overcharged when the terminal voltage measured by the measurement unit is equal to or higher than an overcharge detection voltage; and

    a control unit to which the terminal voltage and current measured by the measurement unit are input, the control unit having a first operating mode and a second operating mode in which the consumed current is small, as compared to that in the first operating mode, wherein;

    a voltage in a range of from a full charge voltage of the secondary battery to less than the overcharge detection voltage is defined as a voltage threshold,the control unit changes from the first operating mode to the second operating mode when a state in which a transition requirement is satisfied lasts for a predetermined period of time, andthe transition requirement is that the current measured by the measurement unit be smaller than a current threshold and the terminal voltage measured be equal to or smaller than the voltage threshold.

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