PROTECTION CIRCUIT FOR BATTERY

摘要

Provided is a protection circuit for a battery, capable of detecting a charging overcurrent and detecting a discharging overcurrent and a short circuit when overcharged. The protection circuit for the battery for controlling charging and discharging of the battery includes: a reference voltage circuit for generating a first reference voltage; an overcurrent detection unit for detecting an overcurrent state or a short circuit state of the battery; a charging control switch and a discharging control switch for breaking the overcurrent according to an output signal of the overcurrent detection unit; a parasitic diode turned on to allow a discharging current or a charging current to flow when the charging control switch or the discharging control switch is turned off to stop charging or discharging in case of the generation of the overcurrent; and a diode voltage detection unit for detecting a forward voltage of the parasitic diode and forming a second reference voltage by dividing the first reference voltage, wherein the overcurrent detection unit detects a state of the battery using a voltage of an overcurrent detection terminal and either the first reference voltage or the second reference voltage depending on the overcurrent state.