An energy-store floor assembly for a motor vehicle includes an electrical energy-store device which has a plurality of battery modules and is accommodated in a multi-part store housing and arranged on the bottom side of a vehicle floor of the motor vehicle. In order that the store housing can be adapted to the shape of the motor vehicle body and/or to components of the energy-store device in an improved way, housing parts of the store housing are interconnected by at least one gas-tight connection, which has an uneven course with respect to the vehicle vertical direction in at least one length region.