ANOMALY DETECTION DEVICE

PROBLEM TO BE SOLVED: To provide an anomaly detection device that can detect a disconnection between each battery cell constituting an assembled battery and a circuit for monitoring each battery cell even if a breakdown voltage of a Zener diode is set low.SOLUTION: The anomaly detection device includes: a plurality of detection terminals C connected to connection parts of adjacent battery cells 10; Zener diodes 21 connected in parallel between opposite terminals of the battery cells 10, respectively; a plurality of short-circuiting circuits 22 having short-circuiting switches 222 for short-circuiting the detection terminals C connected to the opposite terminals of the battery cells 10, respectively; a monitoring circuit 23 for controlling each short-circuiting circuit and detecting a terminal voltage between every adjacent detection terminal C; and a control section 24b for determining whether or not there is a disconnection between the connection part of every adjacent battery cell 10 and the detection terminal C on the basis of a corrected voltage value obtained by removing a variation component variable in accordance with a cell voltage Vc of the battery cell 10 and a protection voltage Vz of the Zener diode 21 from a terminal voltage Vp available when the short-circuiting switch 222 is turned on.