A control device for the control of a module battery, comprising a first external bus interface for the reception of external control commands from a higher level control and an internal bus interface for an internal bus, by way of which battery modules connected with the control device are able to be controlled in accordance with the external control command and by way of which the battery modules may transmit messages to the control device. The control device possesses a second external bus interface, by way of which visualizing data for visualizing at least one function of the module battery may be applied.