DE102012219081A1 - Fixation device for supporting changeable traction battery in lower base-side installation space of e.g. motor car, has transformation device transforming movement of nut into motion of clamping wedge toward spindle axis - Google Patents

Abstract

The device has a displaceable clamping wedge for blocking a locking bolt along traveling direction. A screw thread shoot is orthogonally mounted on a spindle along the traveling direction. The clamping wedge is mounted on the spindle. A nut is actively connected with the clamping wedge. A transformation device transforms a movement of the nut into a motion of the clamping wedge toward the spindle axis along the traveling direction. A ramp guide is connected with the clamping wedge along the clamping wedge. Two spanning devices (2) are connected with each other.

Description

The invention relates to an electrically driven vehicle with a replaceable traction battery and a device for fixing the traction battery in an underbody space of the vehicle.

In the course of the shortage of fossil fuels and increased pollution caused by the worldwide increase in individual traffic, electric drive concepts for motor vehicles are becoming increasingly important. However, a large-scale collection of electrically powered vehicles are currently the high cost of energy storage required battery and their limited storage capacity and their compared to a refueling long charging time. In particular, the lack of suitability for purely electric vehicles for long-distance traffic justifies the lack of acceptance in the market.

One approach to the enhancement of electrically powered vehicles for long-haul traffic is in the US2009082957A1 Thereafter, vehicles are equipped with removable batteries that can be replaced in a nationwide network of battery changing stations against fully charged batteries as soon as their state of charge comes to an end. Such a battery replacement process can be performed significantly faster than charging the battery.

In the system presented in the above-mentioned document, the driver does not purchase the expensive traction battery. As a result, its initial investment costs for the electric vehicle are significantly reduced, which could lead to increased customer acceptance. By contrast, for example, the operator of the changing station or a third service provider owner of the battery, which is financed by the user of the vehicle to be paid royalties.

The attractiveness of such a system depends on the one hand on the cost of the components that are needed for a battery change on the part of a battery replacement station and the vehicle or the battery. Furthermore, these components must allow a quick battery change and at the same time a secure fixation of the traction battery in the vehicle during operation.

From the US20100071979A1 a battery replacement system is known in which the traction battery is mounted in a frame construction. On the vehicle there are four snap locks, which are actuated by also mounted on the vehicle electric motors and various transmission components. The latches engage in a bolt attached to the battery to lift it from the vehicle underbody side into the vehicle and fix it there.

The invention has for its object to enable a simple and secure fixation of a removable traction battery in an electrically powered vehicle, even with large dynamic loads.

This object is achieved by a fixing device for mounting a replaceable traction battery in an underbody space of an electrically driven vehicle with the features according to claim 1.

Advantageous embodiment of the invention can be found in the dependent claims.

The fixation of the traction battery is inventively characterized in that each one fixing device cooperates with a retaining bolt. Advantageously, at least four retaining bolts are provided in an electrically driven vehicle with a removable traction battery, each cooperating with a fixing device to ensure a secure hold of the traction battery in the compartment-side space of the vehicle even at high dynamic loads. Preferably, these at least four retaining bolts are arranged on two mutually opposite sides of the lower-side installation space. Advantageously, the said opposite sides are the longitudinal sides of this construction space, which are aligned, for example, in the direction of travel.

In an advantageous embodiment of the invention, a fixing device is provided per retaining bolt, which is arranged at a position corresponding to the position of the respective retaining bolt of the traction battery. In the context of the invention, an arrangement at a location of the traction battery also means an arrangement at a location of a battery trough which is provided for holding the traction battery. Accordingly, if the retaining bolts are attached to the longitudinal sides of the compartment-side installation space, the fixing devices are also located on the longitudinal sides of the traction battery or the battery tray, so that they can engage in the retaining bolts as soon as the traction battery is inserted from a battery changing station into the compartment-side installation space.

The assignment of fixing device and retaining bolts is interchangeable. Thus, an advantageous embodiment of the invention is also conceivable with at least four fixing devices, of which two are arranged on two opposite sides of the lower-side installation space, and each fixing a retaining bolt, which is arranged at one of the position of the respective fixing device corresponding point of the traction battery.

A fixing device according to the invention comprises a clamping wedge displaceable in a travel direction for clamping one of said retaining bolts. The fixed position is therefore characterized in that the clamping wedge is displaced so far in the direction of travel in the direction of the retaining bolt, that the retaining bolt is pressed against a stop with the necessary clamping force. Advantageously, the stopper is also part of the fixing device.

To fix the up to 400 kg traction battery considerable clamping forces must be applied. This applied in the direction of travel force can be applied in an advantageous manner by an electric motor drive. For example, the torque of a rotary dynamoelectric machine can be converted by means of a screw drive into a translational movement of the clamping wedge in the direction of travel.

According to the invention, the propulsion of the displaceable clamping wedge is realized by means of a screw drive with a spindle mounted substantially orthogonally to the direction of travel. In a preferably horizontal direction of travel of the clamping wedge, this means that the spindle extends substantially vertically in the installed state of the fixing device. A vertically oriented spindle has the advantage that it can be brought into operative connection with a tool acting on the bottom side, which is provided for rotating the spindle. If, for example, the traction battery is introduced into the space-side installation space by means of a lifting table, then the fixing device is preferably likewise reachable on the underside by a tool for rotating the spindle. Such a tool attacks, for example, on a head of the spindle on the bottom side to rotate it.

According to the invention, a nut mounted on the spindle and in operative connection with the clamping wedge is furthermore provided. Upon rotation of the spindle, the nut is moved in the direction of the spindle axis. In the preferably vertically arranged spindle, this means that the nut is moved by rotation of the spindle up or down.

Further, according to the invention is a device for converting a movement of the nut in the direction of the spindle axis in a movement of the clamping wedge in the direction of travel element of the fixing device. If a replaceable traction battery to be newly installed is already in the space-side installation space in the position in which it is to be subsequently held, a vertical movement of the nut, which is triggered by rotation of the spindle axis, is converted into a translational, horizontally oriented movement of the clamping wedge. To clamp the traction battery, the clamping wedge thus moves in the direction of the retaining bolt and braces it against a stop of the fixing device.

The fixing device according to the invention makes it possible in a particularly simple manner to exert a high biasing force on the retaining bolt. Characterized in that the direction of travel and spindle axis are arranged orthogonal to each other, a head of the spindle can be easily operated by a tool on the bottom side.

The clamping wedge preferably has an angle to the direction of travel of 3 to 25 degrees, in particular 3 to 20 degrees, at its contour in contact with the retaining bolt, wherein an angle of 18 degrees has proved to be particularly advantageous.

In an advantageous embodiment of the invention, said device comprises an angularly fixed to the direction of travel and with the clamping wedge ramp guide, within which the nut is guided in the movement in the direction of the spindle axis. As a result of the guidance of the nut, the ramp and the clamping wedge firmly connected with it move in the direction of travel as soon as the nut is moved in the direction of the spindle axis oriented orthogonally to the direction of travel.

In a further advantageous embodiment thereof, the ramp guide extends at an angle of 25 to 60 degrees, preferably 35 to 45 degrees, to the travel direction. Said angle is decisive for the gear ratio, with which the particular vertical movement of the nut is converted into a particular horizontal movement of the spindle. At a very shallow angle, the mother has to make only a small stroke to cause a relatively large travel of the clamping wedge. If, on the other hand, a larger angle is selected, a larger stroke of the nut is necessary for the same travel of the clamping wedge. Although this increases the force to be transmitted to the clamping wedge, but at the expense of an increased overall height.

A further advantageous embodiment of the fixing device is characterized in that the screw drive is enclosed by two opposing surfaces of the clamping wedge and the ramp guide by a respective obliquely arranged guide rail on each of the surfaces is formed, in which the mother is guided. Accordingly, the clamping wedge encloses the screw on both sides fork-shaped, wherein the ramp guide is designed as a two-sided backdrop for the arranged on the spindle nut.

As an alternative to the aforementioned ramp guide, an embodiment of the invention is advantageous in which the nut is articulated to the clamping wedge via a lever element, which is arranged as a function of the position of the mother stronger or weaker angled to the direction of travel. Such a lever is pivotally connected at one end to the clamping wedge and at the other end via a hinge with the nut. If the particular vertically displaceable nut changes its position, the lever will more or less buckle with respect to the orientation of the clamping wedge, i. the travel direction, a. In a horizontally oriented travel of the clamping wedge this means that the clamping wedge is viewed horizontally furthest from the nut when the lever has assumed a position that comes as close as possible to the horizontal. If the nut is moved along the spindle axis from such a position, the articulation angle between the lever and the clamping wedge increases, as a result of which the clamping wedge is brought into a released position of the fixing device.

To avoid transverse loads on the spindle, the fixing device in a further advantageous embodiment of the invention, a support member which causes a guide of the nut in the direction of the spindle axis and the mother is supported against acting in the direction of travel forces. Such a support member is z. B. arranged on each of the two opposing surfaces of the clamping wedge and advantageously has a dovetail-shaped profile which engages in corresponding grooves of the nut.

It is desirable that despite the very high clamping forces required to fix the traction battery as small as possible Kraftabstützung can be realized, are charged in the smallest possible components. This is done in an advantageous embodiment of the invention in that the fixing device has a first and second support bearing for receiving forces acting in the direction of the spindle axis on the clamping wedge, wherein the first support bearing viewed in the direction of travel is arranged in front of a stop point for the retaining bolt and the second support bearing behind said stop point. As a result, forces acting on the clamping wedge orthogonally to the direction of travel when clamping the retaining bolt can be absorbed on both sides of the force introduction, and thus an effective force support for the clamping force is realized in a small space.

In a further advantageous embodiment of the invention, the fixing device of a friction brake for securing the spindle against unintentional rotation. This ensures that the traction battery can not be released from the compartment-side space during travel, especially under the influence of dynamically acting forces. It is particularly advantageous here to form said friction brake in the form of a tolerance ring, via which a head of the spindle is mounted perpendicular to the spindle axis within the fixing device. To rotate the spindle, the frictional force caused by the tolerance ring must first be overcome.

Preferably, the above-mentioned frictional locking of the spindle is to be supplemented by a positive locking mechanism, in which first a pressure has to be applied to the spindle in the axial direction in order to set it in rotation. The remaining through the positive locking mechanism game, which may still cause an undesirable reduction of the biasing force during operation, is advantageously mitigated by the frictional locking means of the addressed tolerance ring.

Fixing devices according to one of the previously described embodiments can be arranged either in the compartment-side installation space or on the traction battery. Conveniently, at least four fixing devices and four interacting with these holding bolts are provided to securely fix the traction battery in the compartment-side space. An arrangement of the fixing device on the replaceable traction battery has the advantage that it does not need to be initially detected electronically within a battery changing station with complex technical means to apply the required for actuating the spindle drive torque of an actuator of the battery exchange station. Rather, such an actuator can already be brought into operative connection with the tool interface of the fixing device when the traction battery is arranged, for example, on a lifting table, which is to insert it into the compartment-side space of the vehicle.

To protect the fixing from moisture and dirt, it is also advantageous that the fixing device comprises a housing within which the clamping wedge and the screw are partially housed, wherein the housing interior is sealed by a seal which surrounds a cylindrical part of the clamping wedge.

In the following, the invention will be described with reference to the embodiments illustrated in the figures described in more detail. Equivalent elements are provided in the figures with the same reference numerals.

Show it:

1 a part of a compartment-side installation space of a vehicle for accommodating a traction battery,

2 an underbody space and an insertable traction battery,

3 a sectional view of a fixing device according to a first embodiment of the invention,

4 an exploded view of the embodiment according to 3 .

5 a three-dimensional representation of the fixing after 3 .

6 an enlarged view of a against a stop of the fixing device according to 3 jammed retaining bolt,

7 an alternative embodiment of a retaining pin jammed against the in 6 already shown stop,

8th a first spatial representation of a screw drive for a fixing device,

9 a second spatial representation of the screw according to 8th .

10 a screw drive with a friction brake,

11 an enlarged view of the friction brake after 10 .

12 an embodiment of a fixing device with two Stützulagern and

13 an embodiment of a fixing device with a lever plate.

For identical or equivalent elements of the invention, identical reference numerals are used.

1 shows a part of an underbody space 1 a vehicle for receiving a traction battery. Shown is a half of the bottom-side space 1 For example, the passenger side. On one side of the compartment-side installation space 1 There are two spaced bracing devices 2 , These each have a linear actuator, wherein the two linear actuators of the two bracing devices 2 can be moved along a common axis. Using these two bracing devices 2 becomes one side of a traction battery to be inserted in the compartment-side space 1 of the vehicle braced. On the not shown in the figure, the bracing devices 2 opposite side of the bottom-side space 1 There are also two bracing devices 2 in the same arrangement to each other as the one shown. Overall, thus four bracing devices 2 in the compartment-side space 1 distributed over two opposite sides of the bottom-side space 2 arranged.

2 shows an underbody space 1 and an insertable traction battery 3 , The bottom-side space 1 corresponds to the in 1 already shown, here the in 1 missing second half of the underbody space 1 is now recognizable. Accordingly, here are the opposite bracing devices 2 at least partially visible in the illustration.

It can also be seen that on the traction battery 3 retaining bolt 4 are arranged. These are also arranged on two opposite sides of the battery, such that they with the correspondingly arranged bracing devices 2 can interact.

To change the battery is by means of a battery replacement station, the traction battery 3 in the lower-level space 1 lifted before the bracing devices 2 to become active. For fixing, finally, the linear actuators of the bracing devices 2 actuated. An electrical contact of the traction battery 2 via the in the 1 and 2 illustrated contact socket.

The illustrated bracing devices 2 are not necessarily to be regarded as embodiments of the invention. The representation in the 1 and 2 serves primarily to illustrate the basic anchoring of the traction battery by bracing retaining bolts, which is also achieved by means of the invention presented here.

3 shows a sectional view of a fixing device 6 according to a first embodiment of the invention. Unlike in the 1 and 2 Now suppose that the illustrated fixer 6 for mounting on the traction battery 3 is provided. Overall, here are four fixators 6 on two opposite sides of the traction battery 3 arranged with the correspondingly arranged on the vehicle body retaining bolts 4 for fixing the traction battery 3 interact. The fixing 6 includes for this purpose a clamping wedge 7 holding the retaining bolt 4 against a stop 8th jammed.

To the retaining bolt 4 to jam, the clamping wedge 7 in a horizontal oriented direction of travel 9 moved from right to left as shown. When open, the clamping wedge is located 7 on the right side, while the clamping wedge 7 when closed, left.

The horizontal movement of the clamping wedge 7 is by a screw drive 10 initiated. This screw drive 10 includes a tool interface 11 at which an electric motor operated tool can engage to introduce a torque in the fixing device. The screw drive 10 further comprises a vertically oriented spindle 12 and a mother led to this 13 with an internal thread, which with an external thread of the spindle 12 engaged. The mother 13 learns during a rotational movement of the spindle 12 a vertical translation.

This vertical translation of the mother 13 is via an obliquely arranged guide rail 14 in a horizontal movement of the clamping wedge 7 changed. The guide rail 14 that on both sides of the mother 13 is engaged with this, this is fixed to the clamping wedge 7 connected.

For jamming the retaining bolt 4 the mother has to 13 be moved downwards along the spindle axis. The translation, with which the vertical movement of the mother 13 in a horizontal movement of the clamping wedge 7 is significantly dependent on the angle, which has the guide rail relative to a horizontal. Particularly advantageous is an angle in the range of 35-45 degrees to the direction of travel 9 exposed. This angle allows a compact design and yet the deployment of the required clamping force for secure fixation of the traction battery 3 ,

Once the clamping wedge 7 in the retaining bolts 4 enters, arises in the direction of travel 9 a significant component of force, the unwanted transverse loads on the spindle 12 can cause. To avoid this is a vertically arranged support element 15 provided that the mother 13 also leads. This support element 15 is designed as a rail with a dovetail-shaped profile on both sides in a corresponding groove of the nut 13 intervenes. As well as the guide rail 14 is the support element 15 arranged on both sides of the mother.

The illustrated fixing device 6 has the advantage of being for fixing the traction battery 3 required clamping force can be very easily introduced by an outside of the vehicle arranged actuator. An electromotive drive required for this purpose can be provided in a battery changing station, with which the traction battery 3 in the lower-level space 1 of the vehicle can be introduced for example by means of a lifting table. As a result of the fixing devices on the traction battery 3 mounted, also provides finding the tool interface 11 no special challenge for such a battery changing station. This would be different if the fixing devices 6 would be mounted on the vehicle body. Because here, first, depending on the vehicle position, the tool interface 11 For example, be detected using an optical sensor.

In 3 is also an inductively operating position sensor 16 recognizable, with the position of the retaining bolt 4 at the stop 8th can be detected. On the operation of this position sensor 16 is related to 6 detailed.

4 shows an exploded view of the embodiment according to 3 , First, it can be seen that the clamping wedge 7 Element of a wedge gate 17 is, on which also the two obliquely arranged guide rails 14 are arranged with the mother 13 engage. Also is a support part 18 recognizable, which is the support elements 15 wearing with the dovetailed profile. Also visible in the exploded view is the screw drive 10 whose operation is related to the 8th and 9 will be explained in detail.

The clamping wedge 7 gets on its path through a horizontal guide 19 guided, at their the screw drive 10 opposite side with a seal 20 is completed. The seal 20 seals the entire actuator of the fixing against dirt and spray.

5 shows a three-dimensional representation of the fixing device 6 to 3 , Here it can be seen that the entire fixation device 6 is almost completely closed, so that the mechanics of the screw drive 10 is protected from external influences. Only for the clamping wedge 7 must have a passage opening in the area of the horizontal guide 19 be provided. By already related to 4 mentioned seal can also be avoided here the ingress of splash water and dirt.

6 shows an enlarged view of a against a stop 8th the fixing device 6 according to 3 jammed retaining bolts 4 , Already related to 3 mentioned inductive position sensor 16 The task is to determine if the retaining bolt 4 in the area of the stop 8th is or not. In a higher-level monitoring unit gives the position sensor 16 a corresponding status signal.

In comparison shows 7 an alternative embodiment of a retaining pin jammed against the in 6 already shown stop 8th , This is a round bolt 21 ,

The in 6 shown retaining bolts 4 is characterized by being both in the area of the attack 8th as well as on the Schmiegefläche to the clamping wedge 5 has a mating contour, which has a very large radius and thus is formed almost flat. The advantages of this form are in particular due to the direct comparison with the in 7 shown round bolt 21 clear. The retaining bolt 4 has a much larger contact surface to stop 8th , This allows a much greater positional tolerance for the retaining bolt 4 in the area of the stop 8th be allowed without the retaining bolt 4 through the position sensor 16 is no longer detectable. In comparison, the round bolt must 21 be moved in the horizontal direction only a short distance from the ideal center position, to cause the position sensor 16 falsely the absence of the round bolt 21 detected.

The flat contour of the retaining bolt 4 in the area of the clamping wedge 5 In addition, reduces the surface pressure at this point and thus the wear. Furthermore, the symmetry of the retaining bolt formed symmetrically to the vertical axis 4 As a result, this is equally suitable for possible left-right versions of the fixing device.

The clamping wedge 5 has in its clamping area, where he uses the retaining bolt 4 is in contact, an angle of 18 °.

The 8th and 9 show spatial representations of a screw drive 10 for a fixing device 6 , The screw drive 10 includes a positive locking device, which is the spindle 12 to protect against unintentional twisting. This safety device is formed by a kind of spline with two elements 22 . 23 by a spring 24 are braced against each other. The trained as a helical spring 24 ensures that the two elements 22 . 23 without external force in a meshing with each other, whereby the tool interface 11 an anti-rotation is subject. The spindle 12 can not be rotated in this state. Only when on the tool interface 11 in the axial direction, for example, by an attached tool, a pressure is exerted in the direction of the mother 13 is directed, becomes the spring 24 compressed, so the elements 22 and 23 the splines come out of operative engagement. In this way, one can then access the tool interface 11 Applied torque directly on the spindle 12 be transmitted.

In the 10 and 11 is in screw drive 10 shown with a friction brake, the alternative or in addition to the positive locking mechanism previously shown inadvertent actuation of the screw drive 10 prevented. The friction brake is a tolerance ring 25 formed over which a head of the spindle 26 in the circumferential direction of the fixing device 6 supported. This simple tolerance ring 25 ensures that a movement of the spindle 12 only after overcoming the tolerance ring 25 generated friction torque can be applied. The tolerance ring 25 represents the self-locking of the spindle 12 functionally safe and prevents beyond that the always angular play-related, previously explained positive locking device allows no bias loss.

In 12 is an embodiment of a fixing device with two support bearings 27 . 28 shown. When viewed in the direction of travel, the first support bearing is located 27 right side of the stop 8th while the second support bearing 28 in the direction of travel to the left of the stop 8th is positioned. The two support bearings 27 . 28 take in a very advantageous manner, the clamping forces between the clamping wedge 7 and the retaining bolt 4 act in the tensioned state. Bending moments, which is a deformation of the clamping wedge 7 could result, by this arrangement, the support bearing 27 . 28 effectively avoided.

13 shows an embodiment of a fixing device 6 with a lever actuator. As with all previously described embodiments, one with a screw is also here 10 triggered vertical movement of a mother 13 of the screw drive 10 in a horizontally oriented movement of a clamping wedge 7 transferred. Again, there is an external actuator on a tool interface 11 a torque on the spindle 12 of the screw drive 10 applied to the vertical movement of the mother 13 trigger. In contrast to the previously described embodiments of the invention, however, this is the oblique guide rail by a lever 29 replaced, at its two ends articulated on the one hand with the mother 13 and on the other with the clamping wedge 7 connected is. The lever 29 is in an angled position to the horizontal direction of travel of the clamping wedge 7 arranged. It is easy to see that this lever arrangement causes the clamping wedge 7 in the representation to the right wanders when the mother 13 by the movement of the spindle 10 is led upwards. Such a movement would be the same as opening the fixing device. On the other hand, the clamping wedge 7 in the direction of travel to the left and thus in the direction of the retaining bolt 4 moves when the mother 13 along the spindle is guided down. Such movement comes to a halt when the retaining bolt 4 through the clamping wedge 7 with full preload against the stop 8th is stuck. Also in this position is the lever 29 still have a slight angle to the horizontal, whose orientation to the in 13 corresponds represented angle.

LIST OF REFERENCE NUMBERS

1

 bottom side installation space

2

 bracing

3

 traction battery

4

 retaining bolt

5

 Contact socket

6

 fixing

7

 clamping wedge

8th

 attack

9

 traversing

10

 screw

11

 Tool interface

12

 spindle

13

 mother

14

 guide rail

15

 support element

16

 position sensor

17

 wedge slide

18

 supporting part

19

 horizontal leadership

20

 poetry

21

 round pins

22, 23

 Elements of a spline

24

 feather

25

 tolerance ring

26

 spindle head

27, 28

 support bearings

29

 lever

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 2009082957 A1 [0003]
• US 20100071979 A1 [0006]

Claims (11)

Fixing device ( 6 ) for mounting a replaceable traction battery ( 3 ) in a space-side installation space ( 1 ) of an electrically driven vehicle, wherein the fixing device ( 6 ) - one in a travel direction ( 9 ) slidable clamping wedge ( 7 ) for jamming a retaining bolt ( 4 ), - a screw drive ( 109 with a substantially orthogonal to the direction of travel ( 9 ) stored spindle ( 12 ), - one on the spindle ( 12 ) and with the clamping wedge ( 7 ) operatively connected mother ( 13 ) and - a device for converting a movement of the mother ( 13 ) in the direction of the spindle axis in a movement of the clamping wedge ( 7 ) in the direction of travel ( 9 ) having. Fixing device ( 6 ) according to claim 1, wherein said means is at an angle to the direction of travel ( 9 ) and with the clamping wedge ( 7 ) includes fixed ramping within which the nut ( 13 ) is guided during the movement in the direction of the spindle axis. Fixing device ( 6 ) according to claim 2, wherein the ramp guide at an angle of 25 to 60 degrees, preferably 35 to 45 degrees, to the travel direction ( 9 ) runs. Fixing device ( 6 ) according to one of claims 2 or 3, wherein the screw drive ( 10 ) of two opposing surfaces of the clamping wedge ( 7 ) is enclosed and the ramp guide by a respective obliquely arranged guide rail ( 14 ) is formed on each of the surfaces in which the nut ( 13 ) is guided. Fixing device ( 6 ) according to claim 1, wherein the nut ( 13 ) with the clamping wedge ( 7 ) via a lifting element ( 29 ) is articulated, which depends on the position of the mother ( 13 ) stronger or weaker angled to the travel direction ( 9 ) is arranged. Fixing device ( 6 ) according to one of the preceding claims, wherein the fixing device ( 6 ) a support element ( 15 ), which is a guide of the mother ( 13 ) in the direction of the spindle axis and the nut ( 13 ) against in the direction of travel ( 9 ) supporting forces. Fixing device ( 6 ) according to one of the preceding claims, wherein the fixing device ( 6 ) a first and second support bearing ( 27 . 28 ) for receiving forces in the direction of the spindle axis on the clamping wedge 7 ), the first support bearing ( 27 ) in the direction of travel ( 9 ) viewed in front of a stop location ( 8th ) for the retaining bolt ( 4 ) is arranged and the second Stürzlager ( 28 ) behind the said stop point ( 8th ). Fixing device ( 6 ) according to one of the preceding claims, wherein the fixing device ( 6 ) a friction brake for securing the spindle ( 12 ) against unintentional rotation, in particular in the form of a tolerance ring ( 25 ) is formed, over which a head ( 26 ) of the spindle ( 12 ) perpendicular to the spindle axis within the fixing device ( 6 ) is stored. Fixing device ( 6 ) according to one of the preceding claims, wherein the fixing device ( 6 ) comprises a housing within which the clamping wedge ( 7 ) and the screw drive ( 10 ) are partially housed, wherein the housing interior via a seal ( 20 ), which forms part of the clamping wedge ( 7 ) encloses. Electrically powered vehicle with - an exchangeable traction battery ( 3 ), which in an under-floor space ( 1 ) of the vehicle is arranged, - at least four retaining bolts ( 4 ), of which in each case two at two opposite sides of the bottom-side space ( 1 ) are arranged, and - each retaining bolt ( 4 ) a fixing device ( 6 ) according to one of claims 1 to 9, which at one of the position of the respective retaining bolt ( 4 ) corresponding location of the traction battery ( 3 ) is arranged. Electrically powered vehicle with - an exchangeable traction battery ( 3 ), which in an under-floor space ( 1 ) of the vehicle, - at least four fixing devices ( 6 ) according to one of claims 1 to 9, of which in each case two at two opposite sides of the lower-side installation space ( 1 ), and - each fixing device ( 6 ) a retaining bolt ( 4 ) located at one of the positions of the respective fixing device ( 6 ) corresponding location of the traction battery ( 3 ) is arranged.

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