Patent ID: 6873135

Claim:
A battery pack comprising: a rechargeable battery; a management/control unit for managing/controlling the charge and discharge of said rechargeable battery, wherein said management/control unit comprises: a current detecting resistor; a charging current measuring section for measuring the charging current of said rechargeable battery that flows in the current detecting resistor; a voltage detector for measuring the voltage of said rechargeable battery; a temperature detector for measuring and detecting temperatures by means of a temperature sensor fitted to said rechargeable battery; a charge control unit for receiving the outputs from said charging current measuring section, said voltage detector, and said temperature detector; and a charge-and-discharge switch responsive to the charge control unit, and said charge control unit including a self-checking section for monitoring the charging and discharging operation of said rechargeable battery responsive to the output signals from at least one of said charging current measuring section and said voltage detector, and a charging capacity integrating section, and in self-checking performed by the self-checking section of said charge control unit, only charging capacity during charging is integrated, and trouble checking is executed at the rechargeable battery or management/control unit by checking whether or not the charming capacity integrated per charging is higher than a specified valued.