the electric vehicle 14 is positioned above the hatch 8 the latter is opened as will be described in the following text fig6 to 8 illustrate the individual steps for opening the hatch 8 in which case the upper drawing figure in each case shows a highly schematic plan view of the area of the hatch 8 and the lower illustration in each case shows a cross section through the hatch 8 on a vertical section plane behind the rear tire of the electric vehicle 14 the plan view in the upper illustration in fig6 shows four flaps 20 21 22 23 by means of which the hatch 8 is closed each of the four flaps 20 to 23 can pivot about a horizontal axis 20 a 21 a 22 a and 23 a running on the plane of the drawing the curved arrows 22 b and 23 b in the two side flaps 22 and 23 are intended to show that the flaps 22 and 23 can be pivoted about their axes 22 a and 22 b at a time after the track guided entrance of the electric vehicle 14 into the battery replacement position in order to allow the free space required at the side for replacement of the traction battery 6 together with its replaceable frame 7 the two side flaps 22 and 23 are arranged behind the rear wheels 24 in the area of the track of the electric vehicle 14 and allow the electric vehicle 14 to drive over them when the flaps 22 and 23 are.