The invention relates to a grounding device (10) for a battery (100) of a vehicle, comprising a connection section (20) for connecting electric wiring (110) to the battery (100), a grounding section (30) for connecting to a ground (120) of the vehicle, and a contact section (40) for connecting to an external power source, characterized in that the contact section (40) is embodied at least sectionally by way of folding over the material of the grounding device (10).