A modular vehicle system having an electric vehicle and a module that can be connected to the electric vehicle by means of a plug connection, wherein the electric vehicle has at least: - an on-board electrical system for supplying energy to an electric drive unit of the electric vehicle, - a vehicle battery, - a control apparatus for communicating with the module, and - an interface connected to the on-board electrical system and the control apparatus for connecting to the module, which interface forms a first element of the plug connection, wherein the module has at least: - an electrical arrangement - a module control for communicating with the control apparatus of the electric vehicle, and - a connecting element connected to the electrical arrangement and the module control that forms a second element of the plug connection, wherein - the interface of the electric vehicle can be separably connected to the connecting element of the module in order to connect the electrical arrangement of the module to the on-board electrical system of the electric vehicle, - the interface has a first NFC apparatus and the connecting element has a second NFC apparatus that are designed for bidirectional short-range communication with each other in order to connect the control apparatus of the electric vehicle to the module control, - the module is a charging module, - the electrical arrangement of the module has a voltage supply that provides at least two different DC voltages for charging the vehicle battery that form at least one first and one second voltage level, - the connecting element has a first contact element for connecting the on-board electrical system to the electrical arrangement on the first voltage level, and wherein - the connecting element has at least one second contact element for connecting the on-board electrical system to the electrical arrangement on the second voltage level. - an on-board electrical system for supplying energy to an electric drive unit of the electric vehicle, - a vehicle battery, - a control apparatus for communicating with the module, and - an interface connected to the on-board electrical system and the control apparatus for connecting to the module, which interface forms a first element of the plug connection, - an electrical arrangement - a module control for communicating with the control apparatus of the electric vehicle, and - a connecting element connected to the electrical arrangement and the module control that forms a second element of the plug connection, wherein - the interface of the electric vehicle can be separably connected to the connecting element of the module in order to connect the electrical arrangement of the module to the on-board electrical system of the electric vehicle, - the interface has a first NFC apparatus and the connecting element has a second NFC apparatus that are designed for bidirectional short-range communication with each other in order to connect the control apparatus of the electric vehicle to the module control, - the module is a charging module, - the electrical arrangement of the module has a voltage supply that provides at least two different DC voltages for charging the vehicle battery that form at least one first and one second voltage level, - the connecting element has a first contact element for connecting the on-board electrical system to the electrical arrangement on the first voltage level, and wherein - the connecting element has at least one second contact element for connecting the on-board electrical system to the electrical arrangement on the second voltage level. - the interface of the electric vehicle can be separably connected to the connecting element of the module in order to connect the electrical arrangement of the module to the on-board electrical system of the electric vehicle, - the interface has a first NFC apparatus and the connecting element has a second NFC apparatus that are designed for bidirectional short-range communication with each other in order to connect the control apparatus of the electric vehicle to the module control, - the module is a charging module, - the electrical arrangement of the module has a voltage supply that provides at least two different DC voltages for charging the vehicle battery that form at least one first and one second voltage level, - the connecting element has a first contact element for connecting the on-board electrical system to the electrical arrangement on the first voltage level, and wherein - the connecting element has at least one second contact element for connecting the on-board electrical system to the electrical arrangement on the second voltage level.