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Secondary batteries having a protective circuit

  • US 20030064257A1
  • Filed: 10/01/2002
  • Published: 04/03/2003
  • Est. Priority Date: 10/02/2001
  • Status: Active Grant
First Claim
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1. A secondary battery comprising:

  • a rechargeable/redischargeable accumulator; and

    a protective circuit connected to the accumulator wherein charging/discharging current of the accumulator flows through the protective circuit, the protective circuit comprising;

    a heater;

    a diode connected in series with the heater the diode being forward-biased when a charging current is supplied from an external DC voltage source to the accumulator;

    a thermistor connected in parallel with a series circuit, the series circuit comprising the heater and the diode, the thermistor having a resistance value increasing with temperature rise; and

    a fuse connected in series with a parallel circuit comprising the series circuit and the thermistor.

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