A lithium battery tractor

Abstract

The application relates to a lithium battery tractor, which solves the problems that existing diesel engine tractors are seriously polluted and electric drive tractors need to be dragged by a cable, thereby limiting the walking range. The lithium battery tractor comprises a first driving vehicle, a power supply vehicle and a second driving vehicle. The first driving vehicle is internally provided with a first electric drive device, and the two ends of the first driving vehicle are respectively formed with a first connecting piece and a second connecting piece. The second driving vehicle is internally provided with a second electric drive device, and the two ends of the second driving vehicle are respectively formed with a third connecting piece and a fourth connecting piece. The top of the power supply vehicle is provided with a bearing box, the bearing box is internally provided with a power battery, the power supply vehicle is internally provided with a third electric drive device, and the two ends of the power supply vehicle are respectively provided with a first butt joint and a second butt joint. The first butt joint is connected with the first connecting piece, and the second butt joint is connected with the second connecting piece. The first electric drive device, the second electric drive device and the third electric drive device are all connected with the power battery circuit.

Description

Technical Field

[0001] This application relates to the field of downhole equipment technology, and more specifically, to a lithium battery tractor. Background Technology

[0002] Tractor-driven vehicles, as key equipment in underground transportation, are widely used in narrow tunnel environments such as mines and tunnels. Their main function is to transport materials, equipment, or mine cars to designated locations using traction. Based on the type of power source, tractor-driven vehicles can be divided into two main technical solutions: fuel-powered and electric-powered. Fuel-powered tractor-driven vehicles use diesel or gasoline internal combustion engines as their power core, driving the wheels through a mechanical transmission system. While this type of equipment features stable power output and long range, the internal combustion engine generates noise pollution of up to 85-100 decibels during operation. Furthermore, harmful gases such as nitrogen oxides and carbon monoxide emitted during combustion are directly released into the poorly ventilated tunnel space, leading to a deterioration of the air quality in the working environment and seriously affecting the health and safety of underground personnel. Electric-powered tractor-driven vehicles replace internal combustion engines with electric motors, achieving propulsion through the conversion of electrical energy into mechanical energy. Their operation offers advantages such as zero emissions and low noise (below 65 decibels). However, existing electric drive solutions generally adopt a cable-driven power supply mode, where the motor needs to be connected to a fixed power source in the tunnel via a heavy-duty cable. This not only limits the effective operating radius of the tractor to the length of the cable (usually no more than 200 meters), but also easily leads to power outages or equipment snagging accidents due to the entanglement and wear of the towed cable in complex tunnels. At the same time, cables scattered on the ground exacerbate the clutter in the tunnel space, increasing the safety risks and maintenance difficulties when moving other equipment.

[0003] Therefore, there is an urgent need to provide a lithium battery tractor to solve the above problems to some extent. Utility Model Content

[0004] The purpose of this application is to provide a lithium battery tractor vehicle, which can, to some extent, solve the problems of serious pollution from existing diesel engine tractor vehicles and the limited range of electric drive tractor vehicles due to the need to tow cables.

[0005] To achieve the above objectives, the lithium battery tractor provided in this application includes a first driver vehicle, a power supply vehicle, and a second driver vehicle. The first driver vehicle is equipped with a first electric drive unit, and a first connector and a second connector are formed at both ends of the first driver vehicle. The second driver vehicle is equipped with a second electric drive unit, and a third connector and a fourth connector are formed at both ends of the second driver vehicle. A load-bearing box is mounted on the top of the power supply vehicle, and a power battery is stored inside the load-bearing box. The power supply vehicle is also equipped with a third electric drive unit, and a first docking member and a second docking member are provided at both ends of the power supply vehicle. The first docking member is connected to the first connector, and the second docking member is connected to the second connector. The first electric drive unit, the second electric drive unit, and the third electric drive unit are all connected to the power battery circuitry.

[0006] The first vehicle includes a first vehicle body and a first driver's cab. The first driver's cab is located in the middle area of ​​the first vehicle body. The first electric drive device includes a first drive mechanism and a second drive mechanism. The first drive mechanism and the second drive mechanism are arranged opposite to each other at the front and rear ends of the first driver's cab along the length direction of the first vehicle body, and both the first drive mechanism and the second drive mechanism are connected to the power battery circuit.

[0007] Specifically, the second driving vehicle includes a second vehicle body and a second driver's cab. The second driver's cab is located in the middle area of ​​the second vehicle body. The second electric drive device includes a third drive mechanism and a fourth drive mechanism. The third drive mechanism and the fourth drive mechanism are arranged opposite to each other at the front and rear ends of the second driver's cab along the length direction of the second vehicle body, and both the third drive mechanism and the fourth drive mechanism are connected to the power battery circuit.

[0008] Furthermore, the power supply vehicle includes a third vehicle body and a support frame. The support frame is disposed on the third vehicle body, and the support frame and the third vehicle body form a receiving space. The third electric drive device is disposed within the receiving space. The third electric drive device includes a fifth drive mechanism and a sixth drive mechanism, which are spaced apart along the length direction of the third vehicle body.

[0009] Furthermore, the first drive mechanism, the second drive mechanism, the third drive mechanism, the fourth drive mechanism, the fifth drive mechanism, and the sixth drive mechanism all include a drive wheel, a first drive assembly, and a second drive assembly; the output shaft of the first drive assembly and the output shaft of the second drive assembly are both connected to the drive wheel.

[0010] The lithium battery tractor provided by this utility model also includes a parking brake device, which includes a first brake disc and a second brake disc. The first brake disc and the second brake disc are disposed opposite to each other on both sides of the drive wheel, and the first brake disc and the second brake disc can move toward or away from the drive wheel to grip or release the drive wheel.

[0011] Specifically, the parking braking device is a brake-type brake.

[0012] Furthermore, both the first drive assembly and the second drive assembly include a motor and a reducer, with the output shaft of the motor connected to the input end of the reducer and the output end of the reducer connected to the drive wheel.

[0013] The lithium battery tractor provided by this utility model also includes a fail-safe braking mechanism, the braking end of which is connected to the output tail shaft of the motor.

[0014] Specifically, the failure braking mechanism includes a housing, a movable plate, a friction plate, a first elastic element, and a first movable block; the first movable block is disposed in the housing and forms a first oil injection chamber with the housing; one end of the first elastic element is connected to the first movable block and the other end is connected to the housing; the friction plate is connected to the first movable block; and the movable plate is connected to the output tail shaft.

[0015] Compared with existing technologies, the lithium battery tractor provided in this application has the following advantages: The lithium battery tractor provided in this application includes a first driver vehicle, a power supply vehicle, and a second driver vehicle. The first driver vehicle is equipped with a first electric drive unit, and a first connector and a second connector are formed at both ends of the first driver vehicle. The second driver vehicle is equipped with a second electric drive unit, and a third connector and a fourth connector are formed at both ends of the second driver vehicle. A carrier box is installed on the top of the power supply vehicle, and a power battery is installed in the carrier box. The power supply vehicle is equipped with a third electric drive unit, and a first docking member and a second docking member are provided at both ends of the power supply vehicle. The first docking member is connected to the first connector, and the second docking member is connected to the second connector. The first electric drive unit, the second electric drive unit, and the third electric drive unit are all connected to the power battery circuit.

[0016] This analysis shows that the support box on the top of the power supply vehicle provides a stable installation space for the power battery, avoiding damage caused by collisions with underground tunnels or other equipment. The power supply vehicle in this application has a first docking member and a second docking member at its front and rear ends, respectively. Correspondingly, the first driver vehicle and the second driver vehicle have a first connecting member and a third connecting member at their respective ends. Thus, the connection between the first and second driver vehicles and the power supply vehicle is achieved through the connection of the first connecting member with the first docking member, and the connection of the third connecting member with the second docking member.

[0017] Understandably, since the first driver's vehicle is equipped with a first electric drive unit and the second driver's vehicle is equipped with a second electric drive unit, and both the first and second electric drive units are connected to the power battery via wiring, in actual operation, the power battery can provide power to the first, second, and third electric drive units, and the first, second, and third electric drive units can provide sufficient power to enable the smooth movement of the first driver's vehicle, the second driver's vehicle, and the power supply vehicle.

[0018] Since the power supply vehicle is located between the first driver vehicle and the second driver vehicle in this application, a second connector and a fourth connector are respectively provided at the end of the first driver vehicle away from the power supply vehicle and at the end of the second driver vehicle away from the power supply vehicle. The second connector and the fourth connector can facilitate connection with the equipment to be transferred or other transfer vehicles.

[0019] When the first driver's vehicle is the lead vehicle, the fourth connector is used to attach the transfer flatcar; when the second driver's vehicle is the lead vehicle, the first connector is used to attach the transfer flatcar.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the lithium battery tractor provided in the first embodiment of this application; Figure 2 This is a schematic diagram of the internal structure of the lithium battery tractor provided in the first embodiment of this application; Figure 3This is a schematic diagram of the internal structure of the first driver vehicle in the lithium battery tractor provided in the first embodiment of this application. Figure 4 A schematic diagram of the structure of the first drive assembly, the first parking brake device, and the fail-safe braking mechanism in the lithium battery tractor provided in the first embodiment of this application; Figure 5 This is a cross-sectional view of the fail-safe braking mechanism in a lithium battery tractor provided in the first embodiment of this application.

[0023] Icons: 1-First driver's vehicle; 101-First vehicle body; 1011-First connecting component; 1012-Second connecting component; 102-First driver's cab; 103-First drive mechanism; 104-Second drive mechanism; 2-Second driver's vehicle; 201-Second vehicle body; 2011-Third connecting component; 2012-Fourth connecting component; 202-Second driver's cab; 203-Third drive mechanism; 204-Fourth drive mechanism; 3-Power supply vehicle; 301-Cargo box; 302-Power battery; 30 3-Bearing frame; 304-Fifth drive mechanism; 305-Sixth drive mechanism; 306-First docking part; 307-Second docking part; 4-First drive assembly; 5-Second drive assembly; 6-First brake drive; 7-Second brake drive; 8-Failure braking mechanism; 801-Output tail shaft positioning hole; 802-Receiving box; 803-Moving plate; 804-Friction plate; 805-First elastic element; 806-First movable block; 807-Connecting sleeve; 9-Drive wheel; 10-Motor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] In the description of this application, it should be noted that the terms "inner" and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "setup" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] like Figures 1-4 As shown, the lithium battery tractor provided in this application includes a first driving vehicle 1, a power supply vehicle 3, and a second driving vehicle 2. The first driving vehicle 1 is equipped with a first electric drive unit, and a first connector 1011 and a second connector 1012 are formed at both ends of the first driving vehicle 1, respectively. The second driving vehicle 2 is equipped with a second electric drive unit, and a third connector 2011 and a fourth connector 2012 are formed at both ends of the second driving vehicle 2, respectively. A carrier box 301 is installed on the top of the power supply vehicle 3, and a power battery 302 is installed inside the carrier box 301. The power supply vehicle 3 is equipped with a third electric drive unit, and a first docking member 306 and a second docking member 307 are provided at both ends of the power supply vehicle 3, respectively. The first docking member 306 is connected to the first connector 1011, and the second docking member 307 is connected to the second connector 1012. The first electric drive unit, the second electric drive unit, and the third electric drive unit are all connected to the power battery 302 via wiring.

[0028] Compared with existing technologies, the lithium battery tractor provided in this application has the following advantages: The lithium battery tractor provided in this application provides a stable installation space for the power battery 302 through the carrier box 301 set on the top of the power vehicle 3, avoiding the problem of damage to the power battery 302 due to collisions with underground tunnels or other equipment. The power vehicle 3 in this application is provided with a first docking part 306 and a second docking part 307 at its front and rear ends, respectively. Correspondingly, the first driving vehicle 1 and the second driving vehicle 2 are provided with a first connecting part 1011 and a third connecting part 2011 at the end corresponding to the power vehicle 3, respectively. Thus, the connection between the first driving vehicle 1 and the second driving vehicle 2 and the power vehicle 3 can be realized through the connection of the first connecting part 1011 with the first docking part 306 and the connection of the third connecting part 2011 with the second docking part 307.

[0029] Understandably, since the first driver vehicle 1 is equipped with a first electric drive unit and the second driver vehicle 2 is equipped with a second electric drive unit, and both the first and second electric drive units are connected to the power battery 302 via wiring, in actual operation, the power battery 302 can provide power to the first, second, and third electric drive units, and the first, second, and third electric drive units can provide sufficient power to enable the smooth movement of the first driver vehicle 1, the second driver vehicle 2, and the power supply vehicle 3.

[0030] Since the power supply vehicle 3 is located between the first driver vehicle 1 and the second driver vehicle 2 in this application, a second connector 1012 and a fourth connector 2012 are respectively provided at the end of the first driver vehicle 1 away from the power supply vehicle 3 and at the end of the second driver vehicle 2 away from the power supply vehicle 3. The second connector 1012 and the fourth connector 2012 can be used to facilitate connection with the equipment to be transferred or other transfer vehicles.

[0031] When the first driver vehicle 1 is the lead vehicle, the fourth connector 2012 is used to attach the transfer flatbed truck. When the second driver vehicle 2 is the lead vehicle, the first connector 1011 is used to attach the transfer flatbed truck.

[0032] Optionally, such as Figure 1 Combination Figure 2 As shown, the first driving vehicle 1 in this application includes a first vehicle body 101 and a first driver's cab 102. The first driver's cab 102 is located in the middle area of ​​the first vehicle body 101. The first electric drive device includes a first drive mechanism 103 and a second drive mechanism 104. The first drive mechanism 103 and the second drive mechanism 104 are arranged opposite to each other at the front and rear ends of the first driver's cab 102 along the length direction of the first vehicle body 101, and both the first drive mechanism 103 and the second drive mechanism 104 are connected to the power battery 302 circuit.

[0033] The first cab 102 provides a driving space for the operator, enabling the entire tractor train to move. Positioning the first cab 102 in the middle of the first car body 101 allows the first drive mechanism 103 and the second drive mechanism 104 to be located at the front and rear ends of the first cab 102, resulting in a more even weight distribution and ensuring stable operation of the first tractor train 1. Furthermore, the cab design protects the driver from direct impact in the event of an unforeseen collision, ensuring driver safety.

[0034] Accordingly, since the first electric drive unit includes a first drive mechanism 103 and a second drive mechanism 104, the two drive mechanisms can provide more stable and sufficient power. Furthermore, when one of the drive mechanisms fails, the entire tractor can still move slowly to a suitable location for repair, thereby ensuring the continuity and stability of underground transportation operations to a certain extent.

[0035] Optionally, such as Figure 1 Combination Figure 2As shown, the second driving vehicle 2 in this application includes a second vehicle body 201 and a second driver's cab 202. The second driver's cab 202 is located in the middle area of ​​the second vehicle body 201. The second electric drive device includes a third drive mechanism 203 and a fourth drive mechanism 204. The third drive mechanism 203 and the fourth drive mechanism 204 are arranged opposite to each other at the front and rear ends of the second driver's cab 202 along the length direction of the second vehicle body 201, and both the third drive mechanism 203 and the fourth drive mechanism 204 are connected to the power battery 302 circuit.

[0036] The second driving vehicle 2 and the first driving vehicle 1 in this application have the same structure and function, both of which use two drive mechanisms to provide power output. However, it should be noted that the first drive mechanism 103, the second drive mechanism 104, the third drive mechanism 203 and the fourth drive mechanism 204 in this application are all independent drive units that do not affect each other, but can work together to provide higher power drive.

[0037] Optionally, such as Figure 1 Combination Figure 2 As shown, the power supply vehicle 3 in this application includes a third vehicle body and a support frame 303. The support frame 303 is disposed on the third vehicle body and forms a receiving space with the third vehicle body. The third electric drive device is disposed in the receiving space. The third electric drive device includes a fifth drive mechanism 304 and a sixth drive mechanism 305. The fifth drive mechanism 304 and the sixth drive mechanism are spaced apart along the length direction of the third vehicle body.

[0038] The support frame 303 provides a more stable support base, allowing the support box 301 to be stably installed on the top of the overall power supply vehicle 3. The support frame 303 can also work with the third vehicle body to form a housing space, ensuring the stable installation of electrical control equipment and other electrical components.

[0039] In this application, the power supply vehicle 3 is also equipped with a drive structure, and the fifth drive mechanism 304 and the sixth drive mechanism 305 can be arranged at intervals along the length direction of the third vehicle body. The drive wheels 9 of the fifth drive mechanism 304 and the sixth drive mechanism 305 can rotate synchronously with the drive wheels 9 of the first drive mechanism 103, the second drive mechanism 104, the third drive mechanism 203 and the fourth drive mechanism 204, so that under the maximum load, the six drive wheels 9 can rotate synchronously to provide higher torque.

[0040] It is understandable that, such as Figures 1-4 As shown, the first drive mechanism 103, the second drive mechanism 104, the third drive mechanism 203, the fourth drive mechanism 204, the fifth drive mechanism 304 and the sixth drive mechanism 305 in this application all include a drive wheel 9, a first drive component 4 and a second drive component 5; the output shaft of the first drive component 4 and the output shaft of the second drive component 5 are both connected to the drive wheel 9.

[0041] Preferably, each drive mechanism in this application is provided with a first drive component 4 and a second drive component 5. Under the joint drive of the first drive component 4 and the second drive component 5, the drive wheel 9 can be given a more stable power output, thereby ensuring the stability of the overall traction force of the tractor.

[0042] It should be noted that the first drive component 4 and the second drive component 5 mentioned above in this application both include a frequency converter integrated machine, which can communicate with each other and control the start, stop and rotation direction of the motor through the main controller to realize the movement of the whole vehicle.

[0043] It is understood that both the first drive assembly 4 and the second drive assembly 5 in this application include a motor 10 and a reducer. The output shaft of the motor 10 is connected to the input end of the reducer, and the output end of the reducer is connected to the drive wheel 9.

[0044] In this application, the motor 10 is a variable frequency integrated motor 10, the reducer is a planetary reducer, and the drive wheel 9 is a sprocket. Accordingly, the lithium battery tractor provided in this application is attached to the existing underground rack track, that is, in addition to two parallel guide rails, the rack track has a rack in the middle of the guide rail. The tractor can move by meshing the sprocket with the rack track.

[0045] In this application, each sprocket is driven by two variable frequency integrated motors 10, thereby ensuring power supply.

[0046] Optionally, such as Figure 4 As shown, the lithium battery tractor provided by this utility model also includes a parking brake device, which includes a first brake disc and a second brake disc. The first brake disc and the second brake disc are disposed opposite to each other on both sides of the drive wheel and can move toward or away from the drive wheel to grip or release the drive wheel 9.

[0047] By setting a first brake disc and a second brake disc, and the first brake disc and the second brake disc being able to move towards or away from the drive wheel 9, the brake disc can be used to clamp or release the drive wheel 9. Thus, during transportation, the drive wheel 9 is released to allow the vehicle to move, while when it is necessary to decelerate or stop, the drive wheel 9 is stopped to rotate by clamping the brake disc, thereby achieving deceleration and stopping.

[0048] In this application, the first brake disc and the second brake disc are respectively connected to the first brake drive 6 and the second brake drive 7, which can synchronously drive the first brake disc and the second brake disc to move towards or away from the drive wheel 9, thereby locking or unlocking the drive wheel 9.

[0049] Preferably, the parking brake device in this application is a normally closed fail-safe brake, that is, when the tractor is not started and moving, hydraulic oil is not supplied, and at this time, both the first brake disc and the second brake disc are in a state of tight contact with the drive wheel 9, thereby locking the drive wheel 9.

[0050] When the tractor starts, hydraulic oil enters the parking brake device, which moves the first and second brake discs away from the drive wheel 9, allowing the drive wheel 9 to rotate smoothly and realize the tractor function.

[0051] It should be noted that the normally closed fail-safe brake described in this application is a commonly used brake.

[0052] Optionally, such as Figure 3 Combination Figure 4 As shown, the lithium battery tractor provided by this utility model also includes a fail-safe braking mechanism 8, the braking end of which is connected to the output tail shaft of the motor 10.

[0053] In this application Figure 5 The failure braking mechanism 8 shown includes an output tail shaft positioning hole 801. During actual assembly, the output tail shaft of the motor 10 is inserted into the output tail shaft positioning hole 801 to connect to the failure braking mechanism 8, thereby further protecting and braking the motor 10 in case of failure. In turn, by braking the motor 10 and the drive wheel 9 together, the reliability of braking during the operation of the entire vehicle is ensured, so as to ensure the safety of the overall tractor operation.

[0054] Optionally, such as Figure 5 As shown, the failure braking mechanism 8 in this application includes a housing 802, a movable plate 803, a friction plate 804, a first elastic element 805, and a first movable block 806. The first movable block 806 is disposed in the housing 802 and forms a first oil injection chamber with the housing 802. One end of the first elastic element 805 is connected to the first movable block 806, and the other end is connected to the housing 802. The friction plate 804 is connected to the first movable block 806. The movable plate 803 is connected to the connecting sleeve 807, and the connecting sleeve 807 is fitted onto the output tail shaft positioning hole 801.

[0055] In this application, the movable piece 803 will rotate synchronously with the output tail shaft positioning hole 801, and there are multiple movable pieces 803, which are spaced apart along the axial direction of the output tail shaft positioning hole 801. The number of friction plates 804 is adapted to the movable pieces 803, and they are arranged between the intervals of the movable pieces 803.

[0056] by Figure 5Based on the viewing angle, the receiving box 802 in this application also has an oil inlet. When the machine is stopped, the hydraulic oil will not enter the first oil filling chamber. At this time, the first elastic member 805 is in a naturally extended state, pushing the first movable block 806 to move to the left. Since the friction plate 804 is connected to the first movable block 806, it can drive the first movable block 806 to move to the left and contact the movable plate 803. By using the friction between the movable plate 803 and the friction plate 804, the braking of the output tail shaft positioning hole 801 is achieved.

[0057] When the vehicle is started, hydraulic oil enters the first oil injection chamber, which pushes the first movable block 806 to the right, compressing the first elastic element. At the same time, the first movable block 806 drives the friction plate 804 to move to the right and separate from the movable plate 803, thereby unlocking the output tail shaft positioning hole 801 and enabling the entire tractor to move smoothly.

[0058] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.

[0059] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A lithium battery tractor, characterized in that, Including the first driver's vehicle, the power supply vehicle, and the second driver's vehicle; The first driver's vehicle is equipped with a first electric drive device, and a first connector and a second connector are respectively formed at both ends of the first driver's vehicle; The second driver's vehicle is equipped with a second electric drive unit, and a third connector and a fourth connector are respectively formed at both ends of the second driver's vehicle; The power vehicle is equipped with a carrier box on its top, which contains a power battery. The power vehicle is equipped with a third electric drive device, and the two ends of the power vehicle are respectively equipped with a first docking part and a second docking part. The first docking part is connected to the first connecting part, and the second docking part is connected to the second connecting part. The first electric drive unit, the second electric drive unit, and the third electric drive unit are all connected to the power battery circuit.

2. The lithium battery tractor according to claim 1, characterized in that, The first driving vehicle includes a first vehicle body and a first driver's cab. The first driver's cab is located in the middle area of ​​the first vehicle body. The first electric drive device includes a first drive mechanism and a second drive mechanism. The first drive mechanism and the second drive mechanism are arranged opposite to each other at the front and rear ends of the first driver's cab along the length direction of the first vehicle body, and both the first drive mechanism and the second drive mechanism are connected to the power battery circuit.

3. The lithium battery tractor according to claim 2, characterized in that, The second driving vehicle includes a second vehicle body and a second driver's cab. The second driver's cab is located in the middle area of ​​the second vehicle body. The second electric drive device includes a third drive mechanism and a fourth drive mechanism. The third drive mechanism and the fourth drive mechanism are arranged opposite to each other at the front and rear ends of the second driver's cab along the length direction of the second vehicle body, and both the third drive mechanism and the fourth drive mechanism are connected to the power battery circuit.

4. The lithium battery tractor according to claim 3, characterized in that, The power supply vehicle includes a third vehicle body and a support frame. The support frame is mounted on the third vehicle body and forms a receiving space with the third vehicle body. The third electric drive device is mounted in the receiving space. The third electric drive device includes a fifth drive mechanism and a sixth drive mechanism, which are spaced apart along the length of the third vehicle body.

5. The lithium battery tractor according to claim 4, characterized in that, The first drive mechanism, the second drive mechanism, the third drive mechanism, the fourth drive mechanism, the fifth drive mechanism, and the sixth drive mechanism all include a drive wheel, a first drive assembly, and a second drive assembly; The output shafts of the first drive component and the second drive component are both connected to the drive wheel.

6. The lithium battery tractor according to claim 5, characterized in that, It also includes a parking brake device, which includes a first brake disc and a second brake disc. The first brake disc and the second brake disc are disposed opposite each other on both sides of the drive wheel, and the first brake disc and the second brake disc can move toward or away from the drive wheel to grip or release the drive wheel.

7. The lithium battery tractor according to claim 6, characterized in that, The parking braking device is a brake-type brake.

8. The lithium battery tractor according to claim 5, characterized in that, Both the first drive assembly and the second drive assembly include a motor and a reducer. The output shaft of the motor is connected to the input end of the reducer, and the output end of the reducer is connected to the drive wheel.

9. The lithium battery tractor according to claim 8, characterized in that, It also includes a fail-safe braking mechanism, the braking end of which is connected to the output tail shaft of the motor.

10. The lithium battery tractor according to claim 9, characterized in that, The failure braking mechanism includes a housing, a movable plate, a friction plate, a first elastic element, and a first movable block; The first movable block is disposed inside the receiving box and forms a first oil injection chamber with the receiving box; One end of the first elastic element is connected to the first movable block, and the other end is connected to the receiving box. The friction plate is connected to the first movable block, and the movable plate is connected to the output tail shaft.

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