To provide a battery module state detection device which detects the difference in remaining capacity of a plurality of battery cells with a simple constitution and at a low cost while performing charging and discharging, a battery module state control device, a battery system, an electric vehicle, a mobile body, a power storage device and a power supply device.
Battery cells 10a-10c which constitute a battery module 10 are connected in series. The current flowing through a power line 501 is measured by a current measurement section 210 in a battery module state detecting device 200. The current integrated value is calculated by a current integration section 273 on the basis of the current value. The voltage of the battery cells 10a-10c is compared to an intermediate voltage Vth_M by a voltage comparison unit 290. When the voltage of the battery cells 10a-10c and the intermediate voltage Vth_M have become equal, the current integrated value is obtained and the difference in the current integrated values obtained respectively for the cells is calculated as the state of battery module.
MURAO HIROYA
KIRIMOTO MIKA
