BATTERY MONITORING DEVICE

A battery monitoring device monitors an assembled battery in which sets of a plurality of battery cells connected in parallel to each other are connected in series to each other, the battery monitoring device includes an acquisition unit configured to acquire a voltage of the battery cell, a controller configured to control an upper limit value of a current flowing through the battery cell, and a detection unit configured to detect, in a case where the upper limit value is higher than a predetermined value, disconnection in the assembled battery in accordance with a comparison result between the voltage acquired by the acquisition unit and a first threshold value, in which the controller is configured to control the upper limit value such that the upper limit value is equal to or less than the predetermined value when the detection unit detects the disconnection in the assembled battery.