Battery controller

A battery controller that controls a battery for supplying power to a load apparatus, includes a current detection unit, that detects a discharge current and a charge current of the battery, a malfunction detection unit that detects malfunction of a voltage detector for detecting a voltage of the battery, and a contactor control unit that is provided on a power supply line through which the discharge current and the charge current flow to open/close a contactor. The contactor control unit integrates the charge and discharge current when the malfunction of the voltage detector is detected, calculates an actual charge current amount obtained by subtracting an integrated value of the discharge current from an integrated value of the charge current, and prohibits charging/discharging of the battery by controlling the contactor when the actual charge current amount is equal to or more than a predetermined value. 种电池控制器，其控制用于将电力供给到负载装置的电池，该电池控制器包括：电流检测单元，其检测电池的放电电流和充电电流；故障检测单元，其检测用于检测电池的电压的电压检测器的故障；和接触器控制单元，其设置在电源线