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Battery pack and charger arrangement which intermittently monitors battery temperature during recharging and a method thereof

  • US 5,714,868 A
  • Filed: 05/29/1996
  • Issued: 02/03/1998
  • Est. Priority Date: 05/29/1995
  • Status: Expired due to Fees
First Claim
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1. A battery pack and charger assembly which includes a battery pack and a battery charger, said battery pack including a secondary battery and being coupled to said battery charger when said secondary battery recharges, said battery pack comprising:

  • a first terminala second terminal coupled to a negative electrode of said secondary battery;

    a diode having an anode coupled to said first terminal and a cathode coupled to a positive electrode of said secondary battery; and

    a thermistor provided to monitor a temperature of said secondary battery and having opposite ends coupled respectively to said first and second terminals;

    and said battery charger comprising;

    a third terminal connectable to said first terminal;

    a fourth terminal connectable to said second terminal;

    first means for recharging said secondary battery using a constant current and intermittently interrupting the constant current and applying a constant voltage across said thermistor via said third and fourth terminals, said constant voltage being below a fully discharged voltage of said secondary battery; and

    a voltage detector for monitoring a voltage developed across said thermistor in response to application of said constant voltage to said thermistor, said voltage detector detecting said temperature of said secondary battery based on the voltage monitored thereby.

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