A device for detecting battery abnormality, comprising: a voltage-sudden-change detecting circuit, configured to detect whether an instant drop in voltage has occurred to a battery and output a sudden-change signal when the instant drop in voltage has occurred to the battery; a current detecting circuit, configured to detect a consumption current of the battery and output a small-current signal when the consumption current of the battery is smaller than a preset current threshold; and an abnormality detecting unit, coupled with the voltage-sudden-change detecting circuit and the current detecting circuit, and configured to determine that the battery is abnormal when the abnormality detecting unit receives the sudden-change signal and the small-current signal at the same time, store state information on battery abnormality, and send the state information to a controller of a terminal device, wherein the battery is a Lithium-ion battery, wherein the current detecting circuit comprises: an eighth resistor, having one end configured to be coupled to a negative electrode of the battery and the other end configured to be coupled to a positive electrode of the battery via a system load such that the consumption current is a current provided from the battery to the system load; a ninth resistor, having one end coupled with said one end of the eighth resistor; a tenth resistor, having one end coupled with the other end of the eighth resistor; a third differential amplifier, having a negative input end coupled with the other end of the ninth resistor and a positive input end coupled with the other end of the tenth resistor; an eleventh resistor, coupled between the negative input end of the third differential amplifier and an output end of the third differential amplifier; a fourth comparator, having a positive input end coupled with the output end of the third differential amplifier and a negative input end coupled with a reference voltage supply end of the device; and a second phase inverter, having an input end coupled with an output end of the fourth comparator and an output end serving as an output end of the current detecting circuit, wherein the eighth resistor is a current detecting resistor, wherein the current detecting circuit is configured to detect the consumption current of the battery via the current detecting resistor. a voltage-sudden-change detecting circuit, configured to detect whether an instant drop in voltage has occurred to a battery and output a sudden-change signal when the instant drop in voltage has occurred to the battery; a current detecting circuit, configured to detect a consumption current of the battery and output a small-current signal when the consumption current of the battery is smaller than a preset current threshold; and an abnormality detecting unit, coupled with the voltage-sudden-change detecting circuit and the current detecting circuit, and configured to determine that the battery is abnormal when the abnormality detecting unit receives the sudden-change signal and the small-current signal at the same time, store state information on battery abnormality, and send the state information to a controller of a terminal device, wherein the battery is a Lithium-ion battery, an eighth resistor, having one end configured to be coupled to a negative electrode of the battery and the other end configured to be coupled to a positive electrode of the battery via a system load such that the consumption current is a current provided from the battery to the system load; a ninth resistor, having one end coupled with said one end of the eighth resistor; a tenth resistor, having one end coupled with the other end of the eighth resistor; a third differential amplifier, having a negative input end coupled with the other end of the ninth resistor and a positive input end coupled with the other end of the tenth resistor; an eleventh resistor, coupled between the negative input end of the third differential amplifier and an output end of the third differential amplifier; a fourth comparator, having a positive input end coupled with the output end of the third differential amplifier and a negative input end coupled with a reference voltage supply end of the device; and a second phase inverter, having an input end coupled with an output end of the fourth comparator and an output end serving as an output end of the current detecting circuit, wherein the eighth resistor is a current detecting resistor, wherein the current detecting circuit is configured to detect the consumption current of the battery via the current detecting resistor.