SECONDARY-BATTERY PROTECTING INTEGRATED CIRCUIT, SECONDARY BATTERY PROTECTION APPARATUS, AND BATTERY PACK

摘要

A secondary-battery protecting integrated circuit includes, a power supply terminal connected to a positive electrode of the secondary battery, a ground terminal connected to a negative electrode, an input terminal connected to the negative terminal, a control terminal at which a control signal is input, a pull-down resistor connected between the control terminal and the ground terminal, a voltage monitoring circuit monitoring a voltage between the control terminal and the ground terminal, a voltage comparison circuit configured to compare a voltage at the control terminal with a voltage at the input terminal; and a control circuit configured to perform an operation in which a discharge operation of the secondary battery is prevented by turning off a discharge control transistor included in the switch circuit in response to the voltage monitoring circuit detecting that the voltage between the control terminal and the ground terminal is greater than a first threshold.

主权项

1. A secondary-battery protecting integrated circuit for protecting a secondary battery by controlling a switch circuit connected in series in a charge/discharge current path between a negative electrode of the secondary battery and a negative terminal connected to a ground of a load, the secondary-battery protecting integrated circuit comprising:
a power supply terminal connected to a positive electrode of the secondary battery; a ground terminal connected to a negative electrode of the secondary battery; an input terminal connected to the negative terminal; a control terminal at which a control signal is input; a pull-down resistor connected between the control terminal and the ground terminal; a voltage monitoring circuit configured to monitor a voltage between the control terminal and the ground terminal; a voltage comparison circuit configured to compare a voltage at the control terminal with a voltage at the input terminal; and a control circuit configured to perform an operation in which a discharge operation of the secondary battery is prevented by turning off a discharge control transistor included in the switch circuit in response to the voltage monitoring circuit detecting that the voltage between the control terminal and the ground terminal is greater than a first threshold, wherein the discharge operation of the secondary battery is allowed to be performed by turning on the discharge control transistor in response to the voltage comparison circuit detecting that the voltage at the control terminal is lower than the voltage at the input terminal.