(EP921607-A2)      The plug connection consists of at least two casing parts (G1,G2), which respectively have power connections (K1,K2,K1',K2') for the removal or the supply of electric power. The power connections form an electrical connection when plugged together. Integrated data transmission channels are provided in the two casing parts with interface sections assigned to each other, so that a data channel connection is made in addition to the power connection.    A battery control unit is provided at the plug connection. The battery control unit is connected to the electric voltage source, for detection or storage, and to deliver the data to be transmitted. A battery control unit is fitted on one of the casing parts, for the detection or storage of vehicle or battery data.    USE -   For transmitting data of the battery assigned to an electrical voltage source or specific to the vehicle.    ADVANTAGE -   Plug connection between battery and data processing unit is compact and simple.    (DE19751668-A1)      The plug connection consists of at least two casing parts (G1,G2), which respectively have power connections (K1,K2,K1',K2') for the removal or the supply of electric power. The power connections form an electrical connection when plugged together. Integrated data transmission channels are provided in the two casing parts with interface sections assigned to each other, so that a data channel connection is made in addition to the power connection.    A battery control unit is provided at the plug connection. The battery control unit is connected to the electric voltage source, for detection or storage, and to deliver the data to be transmitted. A battery control unit is fitted on one of the casing parts, for the detection or storage of vehicle or battery data.    USE -   For transmitting data of the battery assigned to an electrical voltage source or specific to the vehicle.    ADVANTAGE -   Plug connection between battery and data processing unit is compact and simple.