NOVELTY - The device has control module (200) that triggers electric connector (300) to move from first to second positions upon vehicle crash. A positive pole of battery (101) and positive bus-bar of HV bus (102) are electrically connected to first conductive portion (301). A negative pole and bus-bar are electrically connected to second conductive portion (303), so that an electric current flows between battery and bus. The positive and negative poles of battery are connected to first insulating portion (304), so that no electric current flows between battery and bus.    USE - Connection device between battery and high voltage bus in vehicle (claimed).    ADVANTAGE - The connection device provides an instant, reliable and safe solution to disconnect the battery from the HV bus and actively discharge the rest charge of HV bus by engaging the rest of HV system into a short circuit. The time delay between triggering the connection device and reaching the goal of disconnecting the HV bus from the battery and totally discharging the rest charge of the HV system is virtually zero. The solution reliably works in the event of remaining electricity feeding sources such as a spinning electric motor in combination with an uncontrolled inverter, by using a very low resistance in combination with large conductive cross sections to pull the potential to zero. The high voltage arcing in the event of triggering the device under electric load is reliably prevented, by combining the conductive portions with the non-conductive insulating portions made from flame retardant material in combination with tight tolerances.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method used in a connection device between a battery and a HV bus in a vehicle.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a connection device at a second position.    Battery (101)    High voltage bus (102)    Control module (200)    Electric connector (300)    First conductive portion (301)    Second conductive portion (303)    First insulating portion (304)