BATTERY CONTROL DEVICE AND VEHICLE SYSTEM

Provided is a battery control device capable of obtain a charging/discharging current with a high accuracy. The battery control device 120 includes a time-point setting unit 153 which calculates a voltage difference dV obtained by subtracting a calculated open-circuit voltage OCV from a measured closed-circuit voltage CCV, and sets first and second time points at which an absolute value of the voltage difference dV becomes equal to or less than a predetermined value and an absolute value of a difference in the open-circuit voltage OCV becomes equal to or less than a predetermined value. The battery control device 120 further includes the current integral amount calculation unit 154 to obtain the current integral amount ˆ«I(t) which is an integral amount with time of the current flowing through the cell 111 from the first time point to the second time point, the current correction amount calculation unit 156 which calculates the current error contained in a detection signal output by the current detection unit and sets the current error as the current correction amount on the basis of the current integral amount and a time from the first time point to the second time point, and the current correction unit 131 which corrects the detection signal using the current correction amount.