Connecting elements and methods for the electrical connection between a light-weight metal conductor and an electrical contact, in particular for use in motor vehicles are disclosed. A metal sleeve is cold welded to the conductor. A contact element is connected to the metal sleeve in an electrically conductive manner and can be connected to the contact. A hardenable liquid seals, in a gas-tight manner, a contact element-side opening in the metal sleeve cold welded to the light-weight metal conductor.