On-board power supply connector, in particular for high-voltage on-board power supplies, comprising, - a first connection part arranged in a first housing part, wherein - the first housing part has a longitudinal extension along a longitudinal axis and has an opening on the end face, and the first connection part is mounted in the first housing part such that it can be moved along the longitudinal axis, - a second connection part arranged in a second housing part, wherein - the second housing part has a longitudinal extension along a longitudinal axis and has an opening on the end face, - wherein in the connected state of the connector - the longitudinal axes (4, 36) of the first and second housing parts are collinear, and - the second housing part is fixed relative to the first housing part at least in the longitudinal direction and the second connection part is in mechanical contact with the first connection part, wherein - the first connection part is spring-mounted in the first housing part along the longitudinal axis by a spring element, characterized in, - that the spring element is compressed in the connected state, such that a permanent spring force acts on the connection between the connection parts, and - that the second connection part is arranged on a stripped broad surface of a flat conductor in the form of a bolt, that the second connection part has a conductor receptacle for receiving the flat conductor and that the conductor receptacle has, in its bushing area for the flat conductor, a circumferential seal. - a first connection part arranged in a first housing part, wherein - the first housing part has a longitudinal extension along a longitudinal axis and has an opening on the end face, and the first connection part is mounted in the first housing part such that it can be moved along the longitudinal axis, - a second connection part arranged in a second housing part, wherein - the second housing part has a longitudinal extension along a longitudinal axis and has an opening on the end face, - wherein in the connected state of the connector - the longitudinal axes (4, 36) of the first and second housing parts are collinear, and - the second housing part is fixed relative to the first housing part at least in the longitudinal direction and the second connection part is in mechanical contact with the first connection part, wherein - the longitudinal axes (4, 36) of the first and second housing parts are collinear, and - the second housing part is fixed relative to the first housing part at least in the longitudinal direction and the second connection part is in mechanical contact with the first connection part, wherein - the first connection part is spring-mounted in the first housing part along the longitudinal axis by a spring element, - that the spring element is compressed in the connected state, such that a permanent spring force acts on the connection between the connection parts, and - that the second connection part is arranged on a stripped broad surface of a flat conductor in the form of a bolt, that the second connection part has a conductor receptacle for receiving the flat conductor and that the conductor receptacle has, in its bushing area for the flat conductor, a circumferential seal.