This battery control device is provided with: a voltage detection unit that detects the closed-circuit voltage of a secondary battery; an open-circuit voltage calculation unit that calculates the open-circuit voltage of the secondary battery; and an assembled battery control unit that determines whether a calculated value calculated on the basis of the voltage difference between the closed-circuit voltage and open-circuit voltage of the secondary battery within a continuous prescribed period exceeds a tolerance value decided in advance, wherein said assembled battery control unit outputs a signal to perform charging/discharging restriction of the secondary battery when the calculated value exceeds a tolerance value decided in advance.
