CHARGING CONTROL DEVICE, BATTERY SYSTEM AND CHARGING CONTROL METHOD

A charging control device is to charge a battery device including a battery group including storage battery systems, in which batteries are connected in series, connected in parallel, system switches and bypass switches. The charging control device includes a control device to control the system switches and the bypass switches to control charging of the battery device. The control device determines an individual charging completion total voltage, obtains system remaining charge predetermined capacities for each of total voltages of the storage battery systems to reach the individual charging completion total voltage, charge the battery systems individually such that each of the total voltages of the first and second storage battery systems reaches the individual charging completion total voltage while making remaining charge capacities of batteries uniform to be the system remaining charge predetermined capacities and perform collective charging of the storage battery systems after individually charging storage battery systems.