Power supply device, power supply apparatus, and vehicle

Abstract

This invention relates to a power supply device for vehicles, particularly for commercial vehicles such as electric buses or electric trucks, or for rail vehicles, comprising a contact device (1) that can be lowered toward the vehicle to form an electrical contact between the contact device (1) and the vehicle; a lowering device (2) connected to the contact device (1); and an actuator (3) coupled to the contact device (1) for moving the contact device (1), particularly for the lifting process of the contact device (1). It is suggested that a spring device (4) be connected to the lowering device (2) having a preload before the lowering process of the contact device (1), wherein at least one spring force is formed during the lowering process of the contact device (1) to drive the contact device (1) downward. This enables reliable contact with the vehicle.

Description

Technical Field

[0001] The present invention relates to a power supply device for vehicles, particularly for commercial vehicles such as electric buses or electric trucks, or for rail vehicles, having a contact device that can be lowered toward the vehicle to form an electrical contact between the contact device and the vehicle; having a lowering device connected to the contact device and capable of being connected to a power supply device; and having a drive for moving the contact device, particularly for the lifting process of the contact device, the drive being coupled to the contact device and capable of being connected to a power supply device. Background Technology

[0002] To power vehicles, devices can be employed that automatically establish electrical contact between a charging facility or station on one side and the battery of an electric vehicle on the other. For example, standards EN (European Standard) 50696 and SAE (Society of Automotive Engineers International) J3105 describe this type of device. These devices, for example, are configured to bridge the gap between the charging facility or station on one side and the vehicle on the other, transmit contact force, and transfer charging current. Typically, a distinction is made between devices with active contact force generation and those with passive contact force generation. For devices with active contact force generation, for example, the contact head is moved closer to the charging station by a servo drive, where a contact force is formed between the contact head and the charging station after the docking process. For devices with passive contact force generation, the contact force is formed, for example, by the gravity of the contact head, by lowering the contact head, for example, from the charging station onto the docking device of the vehicle.

[0003] Prior art, for example, DE 20 2014 007 218 U1, discloses a current transmission device with active contact force generation. This current transmission device has a linkage, a contact device, and a servo driver with a brushless motor, wherein the contact device is capable of contacting the current-carrying contact surface of a vehicle via the linkage.

[0004] In addition, WO 2022 / 100790 A1 discloses a power supply device with passive contact force generation, wherein arms (with contact devices coupled to the arms) that are hinged to each other can move between a raised position and a lowered position by means of a drive arrangement, wherein the contact devices can be held in the lowered position by their own weight.

[0005] Furthermore, WO 2023 / 072365 A1 describes a positioning arrangement and a contact method for a charging station. This positioning arrangement includes a positioning device, a drive device, and charging contacts that can contact the contact surface of an electric vehicle to supply current to the vehicle. The drive device includes a support mechanism connected to the positioning device, through which traction force can be transmitted to the positioning device, thereby positioning the charging contacts.

[0006] Furthermore, US 2023 / 0098461 A1 discloses a charging device in which a charging head can be lowered onto a contact device of the vehicle by means of an adjusting device for the charging process of an electric vehicle. The adjusting device may have scissor levers that are hinged together. Summary of the Invention

[0007] The objective of this invention is to provide a power supply device that is an improvement over the prior art, which enables the transmission of high contact force.

[0008] According to the present invention, this task is solved by the power supply device according to claim 1, wherein a spring device is connected to the lowering device, the spring device having a preload before the lowering process of the contact device, wherein during the lowering process of the contact device, at least one spring force is formed, which drives the contact device downward, facilitating the lowering process of the contact device and supplementing the weight of at least the contact device, the lowering device, and the spring device. This enables reliable electrical contact between the contact device and, for example, a docking device of a vehicle, through which current can be supplied and charged, for example, the vehicle's battery. High electrical charging power can be achieved for the vehicle by forming a high contact force between the contact device and, for example, the docking device of the vehicle. The spring device generates an additional force, which, together with the weight of the contact device, the lowering device, and the spring device itself, forms the contact force. The spring device only moderately increases the total mass of the power supply device. Thus, for example, the load-bearing capacity requirements of the holding device (e.g., the top or crossbeam of a vehicle parking garage) can be reduced, and the power supply device can be connected to the holding device, for example, in a hinged manner. The holding device can thus be constructed to be lighter, etc. The descent of the contact device can be initiated, for example, by reducing the torque of the actuator. Thus, instead of lifting the contact device, the actuator brakes the downward movement of the contact device based on gravity and spring force. The power supply lines of the power supply device can be connected, for example, to the descent device and / or to the contact device. These power supply lines can be electrically connected, for example, to the contact elements of the contact device.

[0009] Other advantageous designs of the power supply device according to the invention are derived from the dependent claims.

[0010] For example, it is helpful if the lowering device has multiple scissor levers. This measure improves the mechanical stability of the power supply unit.

[0011] If the spring device has at least one first lowering spring, a preferred solution is obtained where the at least first lowering spring is connected to a first scissor lever and a scissor lever support of the lowering device, or where the at least first lowering spring is connected to a first scissor lever and a second scissor lever of the lowering device. This achieves a compact functional arrangement consisting of the lowering device and the spring device. The movement of the lowering device is associated with a change in the spring tension state of the spring device. Therefore, for example, the spring device can have a greater spring tension in the first retracted state of the lowering device than in the second extended state, thereby the relaxation process of the spring device can assist the movement of the lowering device to the second state, etc. If, for example, the contact device is connected to the scissor lever support, then when the spring device is coupled to the scissor lever support, the spring device can also, for example, cause mechanical stabilization and / or reset of the contact device.

[0012] Furthermore, it is also advisable if the lowering device has at least four scissor levers, preferably six. This allows the load-bearing capacity and gravity of the lowering device to be adjusted as needed. The power supply device can be modularly designed; that is, for example, a first number of scissor levers can be selected based on the contact force and the mechanical characteristics of the spring device. For example, the size of the spring device can also be designed based on a preset second number of scissor levers. This allows the contact force of the power supply device to be set. For example, a first number of scissor levers can be selected with a smaller spring device, thereby reducing the mass of the power supply device (based on the spring device) without reducing the contact force. However, for example, the contact force can be increased by using the spring device based on a preset second number of scissor levers.

[0013] If the actuator is constructed as a motorized crane (Hebezug), a structurally and functionally simple solution for operating the contact device is obtained. The actuator can be designed, for example, as a rope drive mechanism (Seilzug).

[0014] In conjunction with designing the drive unit as a motorized crane, it is helpful if the drive unit's conveying mechanism is hinged to its drive lever, wherein the drive lever contacts the first stop of the power supply unit during the descent of the contact device, and wherein the drive lever disengages from the first stop when the contact device is fully lowered. The drive unit's conveying mechanism can be constructed, for example, as a cable, strap, belt, or chain. The drive lever can compensate for relative movement between the power supply unit and the vehicle, such relative movement being caused, for example, by passengers boarding or alighting, or by lowering one side of the vehicle through leveling adjustments to facilitate boarding or alighting (kneeling), etc. Thus, by changing the angular position of the drive lever (which can rotate relative to the conveying mechanism), for example, the height difference between the power supply unit and the vehicle can be compensated. For example, the top side of the drive lever can contact the bottom side of the first stop. The first stop can, for example, be connected to the contact device. The drive lever can, for example, be hinged to the contact device.

[0015] If at least one sensor is arranged to detect the attitude or position of the drive lever, and this sensor is connected to the actuator via signal transmission, the actuator can be switched based on sensor measurements. In this way, the actuator can be turned off, for example, when the sensor detects an intermediate position or attitude of the drive lever (in which the drive lever is not against the first stop and the contact device is fully lowered). The sensor can be designed as a potentiometer or Hall sensor, and if the drive lever is hinged to the contact device, it can be arranged, for example, on the joint between the drive lever and the contact device. However, it is also conceivable, for example, that the sensor is arranged on the contact device as a distance sensor, and the position of the end of the drive lever is detected by the sensor. For example, the sensor can also be configured as an end position switch and connected to the first stop.

[0016] An advantageous solution is also achieved if at least one lever spring is connected to the drive lever, which has a first tension energy during the descent of the contact device and a second tension energy when the contact device is fully lowered, wherein the first tension energy is greater than the second tension energy. This facilitates the disengagement of the drive lever from the first stop when the contact device is fully lowered. After the descent of the contact device, the lever spring performs a relaxation process, which reinforces the downward movement of the conveying mechanism and the disengagement of the drive lever from the first stop when the contact device is fully lowered. For example, if the lever spring is not fully relaxed when the contact device is fully lowered and at the end of the relaxation process, and the second tension energy is therefore greater than 0 Joules, the second tension energy can be used to maintain the conveying mechanism under residual tension when the contact device is fully lowered, thereby reliably initiating the lifting process to raise the contact device. For example, when the conveying mechanism moves downward, after reaching the fully lowered state of the contact device, the drive lever can rest against the second stop of the power supply device. The second stop can, for example, be connected to the contact device.

[0017] It is also helpful if at least one lever spring is connected to the contact device. This measure achieves a compact functional arrangement consisting of the contact device, the drive lever, and the lever spring. The lever spring can be constructed, for example, as a helical torsion spring (Schenkelfeder) between the contact device and the drive lever.

[0018] If the drive has a motor, a gearbox, and a winch, wherein the drive's conveying mechanism is guided by the winch, can be wound onto the winch, and can be unwound from the winch, and wherein the motor is coupled to the gearbox and the gearbox is coupled to the winch in order to transmit torque from the motor to the winch via the gearbox, then a simple and robust drive mechanism is obtained.

[0019] If the contact device is hinged to the lowering device, compensation for the vehicle's tilt position can also be achieved, and the power supply device can be connected to the vehicle, for example, to perform the charging process.

[0020] Using the power supply equipment according to the invention, which has at least one power supply device according to the invention and a holding device, it is possible to supply power to vehicles in places such as stations, garages, or charging stations, wherein vehicles can be arranged below the holding device, and a lowering device of at least one power supply device is connected to the holding device in a way that allows it to descend toward the vehicle. The power supply device can be connected, for example, to the top of the hall constituting the power supply equipment or to the crossbeam of the charging rack constituting the power supply equipment via the holding device. The lowering device can be hinged to the holding device, for example. Electrical power supply lines of the power supply device can be connected to the power supply equipment, for example, and these power supply lines can be connected to the power grid via the power supply equipment.

[0021] A promising application area for the power supply device and equipment according to the invention can be opened up by a vehicle according to the invention with at least one docking device, which can be supplied with current by means of the power supply device according to the invention and can be arranged below the power supply equipment according to the invention, wherein at least one docking device is configured to make mechanical and electrical contact with the power supply device, and wherein at least one docking device is designed to be mechanically and electrically compatible with the power supply device. The contact device of the power supply device may, for example, have first contact rails spaced apart from each other, which can contact second contact rails of the docking device, wherein the first contact rails may be arranged at right angles to the second contact rails, etc. The docking device may, for example, be arranged on the roof of the vehicle, wherein electrical vehicle wiring can be led from the docking device, for example, to the vehicle's battery, etc. The battery may, for example, be charged by the power supply device. The vehicle may, for example, be an electric bus, an electric truck, or an electric rail vehicle, etc. Attached Figure Description

[0022] The present invention will now be described in more detail with the aid of embodiments. Exemplary examples: Figure 1 A side view of an exemplary embodiment of a power supply device according to the invention is shown, which is connected to an exemplary embodiment of a power supply equipment according to the invention, wherein the exemplary embodiment of the power supply device according to the invention can be connected to an exemplary embodiment of a vehicle according to the invention to charge the battery of the exemplary embodiment of the vehicle according to the invention. Detailed Implementation

[0023] Figure 1The schematic side view shown illustrates an exemplary embodiment of a power supply device according to the invention. The power supply device is configured for use in an electric bus, i.e., for a commercial vehicle, and includes a metal contact device 1, a metal lowering device 2, a drive 3, and a metal spring device 4, which together form an inverted charging pantograph. The bus is an exemplary embodiment of a vehicle according to the invention. However, according to the invention, it is also contemplated that the vehicle be configured as, for example, an electric truck or an electric rail vehicle.

[0024] The contact device 1 is able to descend toward the vehicle in order to form an electrical contact between the contact device 1 and the vehicle. Figure 1 The diagram shows the contact device 1 partially lowered. With the contact device 1 fully lowered, it contacts the docking device 5 on the vehicle roof 6. The docking device 5 is therefore configured to make both mechanical and electrical contact with the power supply unit and is designed to be mechanically and electrically compatible with it. (Not shown) Figure 1 The vehicle lithium-ion battery shown can be charged by being supplied with current by a power supply device in this manner. The lithium-ion battery is charged by not being... Figure 1 The electrical vehicle wiring shown is connected to docking device 5.

[0025] The lowering device 2 is connected to the contact device 1 and, for supporting the power supply device, is connected to an exemplary embodiment of the power supply equipment according to the invention. The power supply equipment is designed as a charging station within a vehicle parking garage and has a retaining device 7 constructed as a beam, to which the lowering device 2 is hinged and connected via rolling contact. The lowering device 2, and therefore the power supply device, is detachably connected to the retaining device 7 of the power supply equipment, for example, for maintenance purposes. A vehicle is arranged below the retaining device 7 of the power supply equipment.

[0026] The first guide lever 8 and the second guide lever 9 of the power supply device are hinged to the lowering device 2. In the region where the first guide lever 8 and the second guide lever 9 overlap, a guide roller 10 is rotatably connected to the first guide lever 8 and the second guide lever 9 (which are oriented towards each other). The guide roller 10 is arranged in the guide groove 11 of the holding device 7 and can roll therein.

[0027] The lowering device 2 has multiple scissor levers, which are connected to the power supply device. Figure 1The arrangement shown is a parallelogram. The lowering device 2 has six scissor levers. However, according to the invention, it is also possible for the lowering device to include fewer scissor levers, such as four, or more. The first end of the first scissor lever 12 and the second end of the second scissor lever 13 are hinged to the scissor lever support 18 of the lowering device 2. The first scissor lever 12 and the second scissor lever 13 are arranged facing each other and overlap each other in the regions of the first and second ends.

[0028] A contact device 1 is connected to the scissor lever support 18. Therefore, the contact device 1 is hinged to the lowering device 2. The third end of the first scissor lever 12 is hingedly coupled to the fourth end of the third scissor lever 14, and the fifth end of the second scissor lever 13 is hingedly coupled to the sixth end of the fourth scissor lever 15. The third scissor lever 14 and the fourth scissor lever 15 are arranged intersectingly and hinged to each other, wherein the seventh end of the third scissor lever 14 is hingedly coupled to the eighth end of the fifth scissor lever 16, and the ninth end of the fourth scissor lever 15 is hingedly coupled to the tenth end of the sixth scissor lever 17. The lowering device 2 can be lowered toward the vehicle and hingedly coupled to the holding device 7 via the eleventh end of the fifth scissor lever 16 and the twelfth end of the sixth scissor lever 17. The fifth scissor lever 16 and the sixth scissor lever 17 are arranged facing each other and overlapping each other in the areas of their eleventh and twelfth ends. The first guide lever 8 is hinged to the sixth scissor lever 17, and the second guide lever 9 is hinged to the fifth scissor lever 16. The spring device 4 is connected to the lowering device 2, arranged mechanically in parallel with the lowering device 2, and has a first lowering spring 19 and a second lowering spring 20 configured as helical springs. The first lowering spring 19 is hinged to the first scissor lever 12 and hinged to the scissor lever support 18, and the second lowering spring 20 is hinged to the second scissor lever 13 and hinged to the scissor lever support 18. According to the invention, it is also conceivable, for example, to arrange only the first lowering spring 19, which is hinged to the first scissor lever 12 and hinged to the second scissor lever 13.

[0029] The actuator 3 is configured as a motorized lifting device, designed as a rope drive mechanism. The actuator 3 includes a motor 21 (designed as an electric motor), a gearbox 22, and a winch 23, wherein a cable delivery mechanism 24 configured as a cable is guided by the winch 23, and can be wound onto and unwound from the winch 23. (The last sentence appears to be incomplete and possibly refers to a different device, "in contact device 1.") Figure 1 In the partially lowered state shown, the conveyor mechanism 24 is partially wound onto the winch 23. To transmit torque from the motor 21 to the winch 23 via the gearbox 22, the motor 21 is coupled to the gearbox 22, and the gearbox 22 is coupled to the winch 23. The driver 3 and the holding device 7 are connected to the power supply, and via... Figure 1 The drive line shown in the diagram, which supplies current to driver 3, is connected to the power grid.

[0030] The drive unit 3 is designed for moving the contact device 1, particularly for the lifting process of the contact device 1, and is coupled to the contact device 1 for this purpose via a conveying mechanism 24. (The last sentence appears to be incomplete and possibly refers to a different process.) Figure 1 The operating computer (Bedienrechner) shown in the diagram, located within the vehicle parking garage, can turn drive 3 on and off and can set the rotational speed of drive 3, thereby enabling, for example, the lifting process of contact device 1. For this purpose, drive 3 is connected via... Figure 1 The signal lines, not shown, are connected to the operating computer.

[0031] Before the descent of the contact device 1, the spring device 4 has a preload. To implement the descent of the contact device 1, the rotational speed of the actuator 3 can be set such that the contact device 1 descends due to the weight of the scissor lever, the contact device 1, and the spring device 4, wherein the actuator 3 brakes the descent of the contact device 1. The spring device 4 is relaxed during the descent of the contact device 1, wherein the spring force of the first descending spring 19 and the second descending spring 20 is generated during the descent of the contact device 1, which drives the contact device 1 downward, facilitating the descent of the contact device 1 and supplementing the weight of the contact device 1, the descending device 2, and the spring device 4.

[0032] The conveying mechanism 24 of the driver 3 is hinged to the drive lever 25 of the driver 3. The drive lever 25 is hinged to the contact device 1.

[0033] The first mechanical stop 26 and the second mechanical stop 27 of the power supply device are connected to the contact device 1. The top side of the drive lever 25 contacts the bottom side of the first stop 26 during the descent of the contact device 1. When the contact device 1 is fully lowered, the drive lever 25 disengages from the first stop 26 because, in the fully lowered state, the contact device 1 is not in contact with the first stop 26. Figure 1 The first contact rail shown in the diagram contacts the docking device 5, which is also not in contact with the first contact rail. Figure 1 The second contact rail is shown, and the contact device 1 is supported on the docking device 5. The first and second contact rails are constructed as conductors and are oriented at right angles to each other. The first and second contact rails can make mechanical contact with each other in a cross orientation. When the first and second contact rails make contact, a conductive connection is formed. The docking device 5 is therefore designed to be mechanically and electrically compatible with the power supply device.

[0034] In the region of joint 28 (through which the drive lever 25 is connected to the contact device 1), a lever spring 29, constructed as a metal helical torsion spring, is connected to the contact device 1 and the drive lever 25. Since the drive lever 25 rests against the first stop 26 during the descent of the contact device 1 and keeps the lever spring 29 mechanically tensioned, the lever spring 29 possesses a first mechanical tension energy during the descent of the contact device 1, and a second mechanical tension energy at the end of the relaxation process of the lever spring 29 when the contact device 1 is fully lowered. The first tension energy is greater than the second tension energy. The second tension energy is greater than 0 Joules to maintain the mechanical tension of the conveyor mechanism 24 and to facilitate the winding process of the conveyor mechanism 24 onto the winch 23 when the contact device 1 should be raised again.

[0035] Because the contact device 1 is supported on the docking device 5 in the fully lowered state, and the drive lever 25 is thus disengaged from the first stop 26, the lever spring 29 performs a relaxation process after the contact device 1 is fully lowered. At the end of the relaxation process, the drive lever 25 rests on the second stop 27 arranged below the first stop 26, wherein the lever spring 29 has a second tension energy.

[0036] The sensor 30, used to detect the attitude of the drive lever 25, is connected to the joint 28 (through which the drive lever 25 is connected to the contact device 1). The sensor 30 is connected via... Figure 1 The sensor circuit, not shown, is electrically connected to the driver 3 for signal transmission and for supplying current to the sensor 30. The sensor 30 is constructed as a potentiometer. The sensor 30 can detect the intermediate position of the drive lever 25 between the first stop 26 and the second stop 27. The driver 3 is shut off when such an intermediate position is detected. According to the invention, the sensor 30 can also be constructed as a Hall sensor. Furthermore, according to the invention, it is conceivable that the sensor 30 can be constructed, for example, as a distance sensor arranged on the contact device 1, and that the position of the end of the drive lever 25 is detected by the distance sensor. It is also conceivable that the sensor 30 can be designed, for example, as an end limit switch connected to the first stop 26.

[0037] Power supply device Figure 1 The power supply line, not shown, is connected to the lowering device 2 and the contact device 1. The power supply line is electrically connected to the first contact rail of the contact device 1 and to the power grid via the holding device 7 and the electrical interface of the vehicle parking garage.

[0038] The total weight of the lowering device 2, contact device 1, spring device 4, and power supply line is approximately 245 N, and the elastic force of the spring device 4 is approximately 98 N when the contact device 1 is fully lowered, thereby generating a contact force of approximately 343 N between the contact device 1 and the docking device 5. According to the present invention, the dimensions of the lowering device 2, contact device 1, power supply line, and / or spring device 4 can be designed in other ways to obtain other ratios of total weight to elastic force and / or achieve other values ​​of contact force.

[0039] List of reference numerals in the attached diagram: 1. Contact device 2. Descent device 3 drives 4. Spring device 5. Docking device 6. Roof 7. Holding device 8 First guide lever 9 Second guide lever 10 guide rollers 11 Guide groove 12 First scissor lever 13 Second scissor lever 14 Third scissor lever 15. Fourth scissor lever 16. Fifth scissor lever 17. Sixth scissor lever 18. Scissor lever support 19 First descending spring 20 Second descending spring 21 motors 22 Gearbox 23. Winch 24 Conveying mechanism 25 Drive lever 26 First stop section 27 Second stop section 28 joints 29. Lever and Spring 30 sensors.

Claims

1. A power supply device for a vehicle, in particular for a commercial vehicle, such as an electric bus or an electric truck, or for a rail vehicle, having a contact device (1) which can be lowered toward the vehicle in order to form an electrical contact between the contact device (1) and the vehicle, having a lowering device (2) which is connected to the contact device (1) and which can be connected to the power supply, and having a drive (3) for moving the contact device (1), in particular for a lifting process of the contact device (1), which is coupled to the contact device (1) and which can be connected to the power supply, characterized in that A spring device (4) is connected to the lowering device (2), which has a preload before the lowering process of the contact device (1). During the lowering process of the contact device (1), at least one spring force is formed, which drives the contact device (1) downward, promotes the lowering process of the contact device (1), and supplements the weight of at least the contact device (1), the lowering device (2), and the spring device (4).

2. The power supply device according to claim 1, characterized in that, An inverted pantograph is formed by a contact device (1), a lowering device (2), a driver (3), and a spring device (4).

3. The power supply device according to claim 1 or 2, characterized in that, The lowering device (2) has multiple scissor levers.

4. The power supply device according to claim 3, characterized in that, The spring device (4) has at least one first descending spring (19), wherein the at least first descending spring (19) is connected to the first scissor lever (12) of the descending device (2) and the scissor lever support (18) of the descending device (2), or wherein the at least first descending spring (19) is connected to the first scissor lever (12) and the second scissor lever (13) of the descending device (2).

5. The power supply device according to claim 3 or 4, characterized in that, The lowering device (2) has at least four scissor levers, preferably six scissor levers.

6. The power supply device according to any one of claims 1 to 5, characterized in that, The spring device (4) and the lowering device (2) are arranged in mechanical parallel.

7. The power supply device according to any one of claims 1 to 6, characterized in that, The drive unit (3) is designed as a motorized lifting device.

8. The power supply device according to claim 7, characterized in that, The conveying mechanism (24) of the driver (3) is hinged to the drive lever (25) of the driver (3), wherein the drive lever (25) contacts the first stop (26) of the power supply device during the descent of the contact device (1), and wherein the drive lever (25) disengages from the first stop (26) when the contact device (1) is fully lowered.

9. The power supply device according to claim 8, characterized in that, At least one sensor (30) is provided for detecting the attitude or position of the drive lever (25), wherein the at least one sensor (30) is connected to the driver (3) in a signal transmission manner.

10. The power supply device according to claim 8 or 9, characterized in that, At least one lever spring (29) is connected to the drive lever (25), which has a first tension energy during the descent of the contact device (1) and a second tension energy when the contact device (1) is fully lowered, wherein the first tension energy is greater than the second tension energy.

11. The power supply device according to claim 10, characterized in that, At least one lever spring (29) is connected to the contact device (1).

12. The power supply device according to any one of claims 7 to 11, characterized in that, The driver (3) has a motor (21), a gearbox (22) and a winch (23), wherein the conveying mechanism (24) of the driver (3) is guided by the winch (23), is able to be wound onto the winch (23) and is able to be unwound from the winch (23), and wherein in order to transmit torque from the motor (21) to the winch (23) via the gearbox (22), the motor (21) is coupled to the gearbox (22) and the winch (23).

13. The power supply device according to any one of claims 1 to 12, characterized in that, The contact device (1) is hinged to the lowering device (2).

14. A power supply device having at least one power supply device according to any one of claims 1 to 13 and having a holding device (7), characterized in that, The vehicle can be arranged below the holding device (7), and the lowering device (2) of the at least one power supply device can be connected to the holding device (7) in a way that lowers toward the vehicle.

15. A vehicle capable of being supplied with current by means of a power supply device according to any one of claims 1 to 13 and capable of being arranged below a power supply device according to claim 14, comprising at least one docking device (5), characterized in that, The at least one docking device (5) is configured to make mechanical and electrical contact with the power supply device, wherein the at least one docking device (5) is configured to be mechanically and electrically compatible with the power supply device.

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