Electric drive system and vehicle

Abstract

The invention provides an electric driving system and a vehicle, relates to the technical field of vehicles, and aims to improve the working efficiency of the electric driving system. The electric driving system comprises a shell, a stator, a rotor, a motor shaft, an end cover, a bearing and an oil collecting device. The shell is provided with a containing space. The stator is arranged in the accommodating space. The stator sleeves the periphery of the rotor. The rotor is sleeved on the motor shaft. The end cover is fixed at the end part of the shell, the end cover is provided with a lubricating space, and the motor shaft extends into the lubricating space. The oil collecting device is located between the motor shaft and the stator and fixed to the end cover, the oil collecting device is provided with an oil collecting groove, the bottom wall of the oil collecting groove is provided with an oil collecting hole, at least part of the oil collecting groove right faces the stator so as to collect cooling oil flowing down from the stator, and the oil collecting hole is communicated with the lubricating space. Therefore, the cost of the electric driving system can be reduced, and the cleanliness in the accommodating space can be improved. And meanwhile, the pressure drop of the electric driving system can be reduced, and the consumption of the lubricating flow of the electronic pump can be avoided.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an electric drive system and a vehicle. Background Art

[0002] In order to ensure the reliability and safety of the electric drive system under high-speed conditions, it is necessary to ensure the lubrication and cooling of the motor-end bearings of the electric drive system. In the related art, the lubrication of the motor-end bearings of the electric drive system is active lubrication, which requires opening an oil channel on the housing to deliver the oil to the bearings through the oil channel, or drilling holes on the motor shaft to deliver the oil to the bearings through the holes. This setting requires increasing the lubrication flow of the electronic pump, and also requires increasing the amount of oil added. In addition, during the lubrication process, the pressure drop of the entire lubrication system will increase, thereby reducing the working efficiency of the electric drive system. Summary of the invention

[0003] In order to solve the above technical problems, the present application provides an electric drive system and a vehicle for improving the working efficiency of the electric drive system.

[0004] In a first aspect, an embodiment of the present application provides an electric drive system, comprising: a housing, a stator, a rotor, a motor shaft, an end cover, a bearing, and an oil collecting device. The housing has a containing space. The stator is arranged in the containing space. The stator is sleeved on the outer periphery of the rotor. The rotor is sleeved on the motor shaft. The end cover is fixed to the end of the housing, the end cover has a lubrication space, and the motor shaft extends into the lubrication space. The oil collecting device is located between the motor shaft and the stator, and is fixed on the end cover. The oil collecting device has an oil collecting trough, and the bottom wall of the oil collecting trough is provided with an oil collecting hole. At least a portion of the oil collecting trough is opposite to the stator to collect the cooling oil flowing down from the stator, and the oil collecting hole is connected to the lubrication space.

[0005] According to the electric drive system of the embodiment of the present application, by making at least part of the oil collecting tank of the oil collecting device face the stator, and making the oil collecting holes on the bottom wall of the oil collecting tank communicate with the lubrication space, the cooling oil sprayed toward the stator can be collected by the oil collecting tank, and the collected cooling oil can flow to the lubrication space through the oil collecting holes, so that the bearings in the lubrication space can be cooled and lubricated. In this way, it is possible to avoid drilling holes in the housing or the motor shaft, and it is also possible to avoid increasing the filling amount of the electric drive system, which is beneficial to reducing the cost of the electric drive system and improving the cleanliness of the accommodating space. At the same time, the pressure drop of the electric drive system can also be reduced, and the oil collecting tank can use the gravity of the cooling oil itself for collection, which can avoid consuming the lubrication flow of the electronic pump, which is beneficial to improving the efficiency of the electric drive system.

[0006] In one possible implementation, the electric drive system further includes an oil injection ring, which is fixed to the inner wall of the housing and is used to spray cooling oil to the stator, and at least a portion of the oil collecting groove is opposite to the oil injection ring.

[0007] In a possible implementation, a guide oil channel is provided on the end cover, one end of the guide oil channel is connected to the oil collecting hole, and the other end of the guide oil channel is connected to the lubrication space.

[0008] In a possible implementation, the oil collecting device includes a fixing member, which is disposed on a side of the oil collecting tank away from the stator and is detachably connected to the end cover.

[0009] In one possible implementation, the electric drive system further includes a fastener, the fixing member is provided with a plurality of mounting holes, the plurality of mounting holes are spaced apart in the length direction of the fixing member, and the fastener passes through the mounting holes to connect the fixing member to the end cover.

[0010] In one possible implementation, the electric drive system further includes a reinforcement sleeve, which is disposed at the mounting hole and is flush with a side wall of the fixing member, and is used to strengthen the structural strength of the mounting hole.

[0011] In a possible implementation, the oil collecting tank and the fixing member are integrally formed.

[0012] In one possible implementation, a reinforcement portion is provided on one side of the oil collecting tank close to the fixing member, and the reinforcement portion extends from the oil collecting hole in a direction away from the oil collecting tank to strengthen the structural strength of the oil collecting hole. The reinforcement portion has a flow channel, and the flow channel is connected to the oil collecting hole.

[0013] In a possible implementation, in the height direction of the oil collecting device, the depth H of the oil collecting groove satisfies: 3 mm ≤ H ≤ 4 mm.

[0014] In a second aspect, the present application provides a vehicle comprising the above-mentioned electric drive system.

[0015] Among them, the technical effects brought about by any design method in the second aspect can refer to the technical effects brought about by different design methods in the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A partial schematic diagram of an electric drive system provided in some embodiments of the present application;

[0019] Figure 2 A partial enlarged view of an electric drive system provided in some embodiments of the present application;

[0020] Figure 3 A three-dimensional diagram of an oil collecting device provided for some embodiments of the present application;

[0021] Figure 4 Schematic diagram of an oil collection device provided in some embodiments of the present application.

[0022] Reference numerals:

[0023] 100. Electric drive system;

[0024] 1. Shell; 11. Accommodation space;

[0025] 2. Stator;

[0026] 3. Rotor;

[0027] 4. Motor shaft;

[0028] 5. End cover; 51. Lubrication space; 52. Guide oil channel;

[0029] 6. Bearings;

[0030] 7. Oil injection ring;

[0031] 8. Oil collecting device; 811. Oil collecting tank; 812. Oil collecting hole; 82. Fixing piece; 821. Mounting hole; 822. Reinforcement sleeve; 83. Reinforcement part. DETAILED DESCRIPTION

[0032] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0033] In the description of the embodiments of the present application, it should be understood that the terms "upper", "lower", "front", "back", "bottom", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0034] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative position relationship after the connection remains unchanged. In addition, the directional terms mentioned in the embodiments of the present application, such as "inside", "outside", etc., are only references to the directions of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present application, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0035] In the description of the embodiments of the present application, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0036] The present application provides an electric drive system and a vehicle.

[0037] The electric drive system of an embodiment of the present application is described below.

[0038] See also Figure 1 and Figure 2 , Figure 1 A partial schematic diagram of an electric drive system provided in some embodiments of the present application, Figure 2 This is a partial enlarged view of the electric drive system provided in some embodiments of the present application. The electric drive system 100 includes a housing 1, a stator 2, a rotor 3, a motor shaft 4, an end cover 5, a bearing 6 and an oil collecting device 8.

[0039] The housing 1 may have a receiving space 11 , so as to prevent foreign matter from entering the receiving space 11 , and also prevent mechanical collision from damaging the internal structure of the motor, thereby playing a good protective role.

[0040] The stator 2 is disposed in the accommodating space 11. Specifically, the stator 2 may be a stationary fixed part of the electric drive system 100, and the stator 2 may generate a rotating magnetic field after current is supplied thereto.

[0041] The stator 2 is sleeved on the outer circumference of the rotor 3. Specifically, the rotor 3 may be a rotating part of the electric drive system 100.

[0042] The rotor 3 is sleeved on the motor shaft 4. Specifically, the motor shaft 4 has a certain mechanical strength and rigidity, and can play the role of transmitting torque and supporting the rotor 3 to rotate.

[0043] The end cover 5 is fixed to the end of the housing 1. The end cover 5 and the housing 1 may be detachably connected, which is convenient for maintenance of the electric drive system 100, thereby improving the maintainability of the electric drive system 100.

[0044] The bearing 6 may be sleeved on the motor shaft 4. As a rotating component of the electric drive system 100, the bearing 6 may play a supporting and positioning role.

[0045] The end cover 5 may have a lubrication space 51, the motor shaft 4 extends into the lubrication space 51, and the bearing 6 may be located in the lubrication space 51. The lubrication space 51 is a cavity for lubricating the bearing 6, and its shape may match the shape of the bearing 6. The lubrication space 51 may be filled with lubricating oil to lubricate the bearing 6. Thus, while lubricating the bearing 6, it is possible to prevent debris from affecting the bearing 6, thereby facilitating the improvement of the safety and reliability of the electric drive system 100.

[0046] The oil collecting device 8 is located between the motor shaft 4 and the stator 2, and is fixed to the end cover 5. The connection between the oil collecting device 8 and the end cover 5 can be a fixed connection, which is conducive to ensuring the stability of the structure. The connection between the oil collecting device 8 and the end cover 5 can also be a detachable connection, which is convenient for replacing and repairing the oil collecting device 8, thereby helping to reduce the maintenance cost of the electric drive system 100.

[0047] The oil collecting device 8 may have an oil collecting tank 811, and at least a portion of the oil collecting tank 811 is directly opposite to the stator 2, so that the oil collecting tank 811 can be used to collect the cooling oil sprayed on the stator 2. Specifically, the housing 1 may have an oil delivery channel. The electronic pump of the electric drive system 100 can spray the cooling oil onto the stator 2 through the oil delivery channel, and heat is exchanged by the spraying and flow of the oil, thereby reducing the temperature of the stator 2. Since the orthographic projection of the oil collecting tank 811 on the plane where the stator 2 is located can overlap with the stator 2, the oil collecting tank 811 can collect the cooling oil flowing down from the stator 2.

[0048] Thus, drilling holes in the housing 1 or the motor shaft 4 can be avoided, thereby avoiding increasing the filling amount of the electric drive system 100, which is beneficial to reducing costs. At the same time, the pressure drop of the electric drive system 100 can also be reduced, which is beneficial to improving the efficiency of the electric drive system 100.

[0049] Exemplarily, the oil collecting tank 811 can be formed into a rectangular shape. This arrangement is convenient for processing. It should be noted that the oil collecting tank 811 can be formed into other shapes, such as a circular shape, a special shape, etc., and this application does not limit this.

[0050] The bottom wall of the oil collecting tank 811 may be provided with an oil collecting hole 812, and the oil collecting hole 812 is connected to the lubrication space 51. Specifically, the oil collected in the oil collecting tank 811 can flow out of the oil collecting tank 811 from the oil collecting hole 812 on the bottom wall by its own gravity, and flow into the lubrication space 51, so that the lubrication space 51 can have cooling oil, thereby lubricating the bearing 6 in the lubrication space 51. This arrangement does not need to consume the lubrication flow of the electronic pump, which is conducive to improving the efficiency of the electric drive system 100.

[0051] It should be noted that the oil collecting hole 812 can be directly connected to the lubrication space 51, or can be connected to the lubrication space 51 through a channel on the end cover 5, and the present application does not impose any limitation on this.

[0052] According to the electric drive system 100 of the embodiment of the present application, by making at least part of the oil collecting groove 811 of the oil collecting device 8 face the stator 2, and making the oil collecting hole 812 on the bottom wall of the oil collecting groove 811 communicate with the lubrication space 51, the cooling oil sprayed toward the stator 2 can be collected by the oil collecting groove 811, and the collected cooling oil can flow to the lubrication space 51 through the oil collecting hole 812, so that the bearing 6 in the lubrication space 51 can be cooled and lubricated. In this way, it is possible to avoid drilling holes in the housing 1 or the motor shaft 4, and it is also possible to avoid increasing the filling amount of the electric drive system 100, which is conducive to reducing the cost of the electric drive system 100 and improving the cleanliness in the accommodating space 11. At the same time, the pressure drop of the electric drive system 100 can also be reduced, and the oil collecting groove 811 can use the gravity of the cooling oil itself for collection, which can avoid consuming the lubrication flow of the electronic pump, thereby helping to improve the efficiency of the electric drive system 100.

[0053] Please continue reading Figure 1 and Figure 2In some embodiments, the electric drive system 100 may further include an oil spray ring 7. The oil spray ring 7 is fixed to the inner side wall of the housing 1 and is used to spray cooling oil to the stator 2. At least part of the oil collecting groove 811 is directly opposite to the stator 2. Specifically, the oil spray ring 7 may have an oil spray hole. The electronic pump of the electric drive system 100 can deliver the cooling oil to the oil spray ring 7 through the oil delivery channel, and the oil can be sprayed onto the stator 2 through the oil spray hole of the oil spray ring 7. Heat is exchanged by the spraying and flow of the oil, thereby reducing the temperature of the stator 2. Since the orthographic projection of the oil collecting groove 811 on the plane where the oil spray ring 7 is located can overlap with the oil spray ring 7, the oil collecting groove 811 can collect the cooling oil flowing down from the stator 2. As a result, the stator 2 can be better lubricated and cooled, and the oil collecting groove 811 can also better collect the cooling oil flowing down from the stator 2.

[0054] Please continue reading Figure 1 and Figure 2 In some embodiments, a guide oil passage 52 may be provided on the end cover 5. One end of the guide oil passage 52 may be connected to the oil collecting hole 812, and the other end may be connected to the lubrication space 51. Thus, the cooling oil flowing out of the oil collecting hole 812 may flow directly into the lubrication space 51 through the guide oil passage 52, thereby achieving accurate lubrication of the bearing 6, which is beneficial to improving the efficiency of the electric drive system 100.

[0055] Exemplarily, the guide oil passage 52 may be an inclined oil passage, and the guide oil passage 52 may be inclined from the oil collecting hole 812 to a direction away from the rotor 3. Such a configuration facilitates the guide oil passage 52 to guide the cooling oil.

[0056] It should be noted that the guide oil passage 52 can be formed by machining or casting. The guide oil passage 52 formed by casting is beneficial to improving the cleanliness of the accommodation space 11.

[0057] See also Figure 2 and Figure 3 , Figure 3 A three-dimensional diagram of an oil collecting device provided in some embodiments of the present application. The oil collecting device 8 may include a fixing member 82. The fixing member 82 may be arranged on a side of the oil collecting tank 811 away from the stator 2, and may be detachably connected to the end cover 5. The detachable connection between the fixing member 82 and the end cover 5 may be achieved by means of a snap connection, a fastener connection, or the like. This arrangement facilitates replacement and maintenance of the oil collecting device 8, thereby facilitating maintenance of the electric drive system 100.

[0058] For example, the extension direction of the oil collecting groove 811 may be perpendicular to the extension direction of the fixing member 82. A portion of the oil collecting groove 811 extends toward the direction close to the stator 2 and directly faces the oil injection ring 7, and the remaining portion may extend toward the direction away from the stator 2 and abut against the end cover 5, so that the end cover 5 can support the stator 2, and the oil collecting hole 812 may be located on this portion. Thus, it is convenient to arrange the oil collecting hole 812, so that the structure of the oil collecting device 8 can be more reasonable.

[0059] Please continue reading Figure 2 and Figure 3 In some embodiments, the electric drive system 100 may further include a fastener. The fixing member 82 may be provided with a plurality of mounting holes 821. The plurality of mounting holes 821 may be arranged at intervals in the length direction of the fixing member 82. The fastener passes through the mounting holes 821 to connect the fixing member 82 to the end cover 5. Here, "plurality" means that the number of mounting holes 821 is two or more.

[0060] Thus, the fastener connection method is helpful to reduce the difficulty of assembling the oil collecting device 8, and also can reduce the manufacturing cost of the electric drive system 100. In addition, the plurality of mounting holes 821 can ensure the reliability of the connection of the oil collecting device 8.

[0061] Please continue reading Figure 2 and Figure 3 In some embodiments, the electric drive system 100 further includes a reinforcement sleeve 822. The reinforcement sleeve 822 is disposed at the mounting hole 821 and is flush with the side wall of the fixing member 82. The reinforcement sleeve 822 is used to strengthen the structural strength of the mounting hole 821. The material of the reinforcement sleeve 822 may be steel or other materials, which is not limited in the present application.

[0062] Thus, the structural strength of the mounting hole 821 can be improved, and the fixing member 82 can be prevented from being damaged during connection, thereby facilitating the improvement of the connection reliability. Meanwhile, the aesthetics of the connection of the oil collecting device 8 can also be ensured.

[0063] Please continue reading Figure 2 and Figure 3 In some embodiments, the oil collecting tank 811 and the fixing member 82 are integrally formed. The oil collecting tank 811 and the fixing member 82 may be injection molded parts. Such a configuration is conducive to reducing the difficulty of assembling the oil collecting device 8, thereby improving the assembly efficiency of the electric drive system 100. At the same time, it is also conducive to reducing manufacturing costs.

[0064] See also Figure 3 and Figure 4 , Figure 4Schematic diagram of an oil collecting device provided for some embodiments of the present application. In some embodiments, a reinforcement portion 83 may be provided on one side of the oil collecting tank 811 close to the fixing member 82. The reinforcement portion 83 may extend from the oil collecting hole 812 in a direction away from the oil collecting tank 811, and is used to strengthen the structural strength of the oil collecting hole 812. The reinforcement portion 83 may have a flow channel, which is connected to the oil collecting hole 812. Specifically, the reinforcement portion 83 extends from the oil collecting hole 812 in a direction close to the motor shaft 4. Therefore, by providing the reinforcement portion 83, the structural strength at the oil collecting hole 812 can be increased, and the flow direction of the oil collecting hole 812 can also be guided.

[0065] Please continue reading Figure 3 and Figure 4 In some embodiments, in the height direction of the oil collecting device 8, the depth H of the oil collecting groove 811 can satisfy: 3mm≤H≤4mm. In this way, it can be ensured that the oil collecting groove 811 can collect enough cooling oil, and at the same time, the problem of oil splashing due to too small a depth can be avoided. It can also be avoided that the volume of the oil collecting device 8 is too large due to too large a depth, so that the structural layout of the electric drive system 100 can be optimized.

[0066] Exemplarily, the depth of the oil collecting groove 811 can be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.8 mm, 4 mm, etc.

[0067] Exemplarily, the thickness W of the fixing member 82 may satisfy: 3 mm ≤ W ≤ 4 mm. The thickness of the fixing member 82 may be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.8 mm, 4 mm, etc. By limiting the thickness of the fixing member 82, the structural strength of the fixing member 82 may be ensured, thereby ensuring the reliability of the connection.

[0068] Please continue reading Figure 3 and Figure 4 In some embodiments, the height of the bottom wall of the oil collecting groove 811 can be gradually reduced in the direction from the edge of the oil collecting groove 811 to the oil collecting hole 812 to form a "funnel" shape. The oil collecting hole 812 is located at the lowest position in the oil collecting groove 811. This arrangement allows the cooling oil collected by the oil collecting groove 811 to flow directly to the oil collecting hole 812, thereby facilitating the improvement of the lubrication efficiency of the bearing 6.

[0069] The vehicle according to the embodiment of the present application is described below.

[0070] The vehicle of the embodiment of the present application includes an electric drive system 100. Such a configuration is beneficial to improving the efficiency of the electric drive system 100 and also beneficial to reducing the manufacturing cost of the vehicle.

[0071] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0072] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An electric drive system, characterized in that: The electric drive system comprises: A housing having a receiving space; a stator, wherein the stator is arranged in the accommodation space; A rotor, wherein the stator is sleeved on the outer circumference of the rotor; A motor shaft, the rotor being sleeved on the motor shaft; An end cover, the end cover is fixed to the end of the housing, the end cover has a lubrication space, and the motor shaft extends into the lubrication space; A bearing, wherein the bearing is sleeved on the motor shaft and is located in the lubrication space; An oil collecting device is located between the motor shaft and the stator and fixed on the end cover. The oil collecting device has an oil collecting groove. The bottom wall of the oil collecting groove is provided with an oil collecting hole. At least a part of the oil collecting groove is opposite to the stator to collect the cooling oil flowing down from the stator. The oil collecting hole is connected to the lubrication space.

2. The electric drive system according to claim 1, characterized in that: The electric drive system further comprises an oil spray ring, which is fixed on the inner side wall of the housing and is used for spraying cooling oil to the stator. At least a portion of the oil collecting groove is directly opposite to the oil spray ring.

3. The electric drive system according to claim 1, characterized in that: The end cover is provided with a guide oil passage, one end of which is communicated with the oil collecting hole, and the other end of which is communicated with the lubrication space.

4. The electric drive system according to claim 1, characterized in that: The oil collecting device comprises a fixing member, which is arranged on a side of the oil collecting tank away from the stator and is detachably connected to the end cover.

5. The electric drive system according to claim 4, characterized in that: The electric drive system also includes a fastener, the fixing member is provided with a plurality of mounting holes, the plurality of mounting holes are spaced apart in the length direction of the fixing member, and the fastener passes through the mounting holes to connect the fixing member to the end cover.

6. The electric drive system according to claim 5, characterized in that: The electric drive system further comprises a reinforcement sleeve, which is arranged at the mounting hole and is flush with the side wall of the fixing member, and is used to strengthen the structural strength of the mounting hole.

7. The electric drive system according to claim 4, characterized in that: The oil collecting tank and the fixing member are integrally formed.

8. The electric drive system according to claim 1, characterized in that: A reinforcement portion is provided on one side of the oil collecting groove close to the fixing member. The reinforcement portion extends from the oil collecting hole in a direction away from the oil collecting groove and is used to strengthen the structural strength of the oil collecting hole. The reinforcement portion has a flow channel, and the flow channel is connected to the oil collecting hole.

9. The electric drive system according to claim 1, characterized in that: In the height direction of the oil collecting device, the depth H of the oil collecting groove satisfies: 3mm≤H≤4mm.

10. A vehicle, characterized in that: The vehicle comprises an electric drive system as claimed in any one of claims 1-9.

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