Power supply device and heavy duty work vehicle

Abstract

The application relates to a power supply device and a heavy-duty working vehicle. The power supply device comprises a chassis, a tray and a battery module. The chassis is provided with a containing cavity, the containing cavity is provided with a guide element, a side wall of the chassis along the extension direction of the guide element is provided with an exit and entry, and the exit and entry is provided with an openable and closable warehouse door. The tray is provided with a sliding element, the sliding element is movably arranged in the guide element, so that the tray can slide out of the chassis through the exit and entry or slide into the containing cavity through the exit and entry. By opening the exit and entry on the side wall of the chassis and arranging the warehouse door, the sliding element on the tray and the guide element in the containing cavity are matched, the tray and the battery module are integrally slid out or pushed in along the direction of the guide element. The pull-out type structure does not need to disassemble the chassis, does not need to rely on special tools, and can quickly complete the replacement or maintenance of the battery module, is favorable for shortening the maintenance time and reducing the operation difficulty. In addition, when the tray slides out of the chassis to replace the battery, the operation area is wide, and the battery module is convenient to maintain.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a power supply device and a heavy-duty work vehicle. Background Technology

[0002] Heavy-duty work vehicles equipped with lifting platform functions (such as aerial work platforms, forklifts, and special engineering vehicles) are widely used in construction, logistics warehousing, equipment installation, and emergency rescue scenarios.

[0003] Battery modules are high-capacity, high-voltage power battery systems that provide driving power to heavy-duty vehicles, directly determining the vehicle's operating capacity, range, and power output. During routine maintenance, troubleshooting, or complete replacement of battery modules, workers must crawl under the chassis or disassemble numerous external structural components to access them, resulting in cumbersome procedures, high labor intensity, and lengthy maintenance times. Furthermore, this maintenance method has stringent requirements for site conditions, necessitating specialized equipment such as trenches and vehicle lifting devices. In scenarios with limited infrastructure, such as in the field or construction sites, battery maintenance work is difficult to carry out efficiently. Summary of the Invention

[0004] Therefore, it is necessary to provide a power supply device and heavy-duty work vehicle that can quickly replace or repair battery modules without the need for special tools. This will help shorten maintenance time, reduce operational difficulty, lower the site requirements for battery module maintenance, and improve the convenience of battery module maintenance.

[0005] In a first aspect, this application provides a power supply device, comprising:

[0006] The chassis has a receiving cavity, a guide member is provided in the receiving cavity, and an entrance / exit is provided on the side wall of the chassis along the extending direction of the guide member. The entrance / exit communicates with the receiving cavity and is provided with an openable and closable door.

[0007] A tray, the tray being provided with a sliding member movably disposed on the guide member, so that the tray can slide out of the chassis through the inlet / outlet or slide into the receiving cavity through the inlet / outlet; and

[0008] A battery module, wherein the battery module is disposed on the tray.

[0009] The aforementioned power supply device, through an entrance and exit on the side wall of the chassis and a compartment door, along with sliding components on the tray and guide components within the receiving cavity, allows the tray and battery module to slide out or be pushed in as a whole along the guide direction. This pull-out structure eliminates the need to disassemble the chassis or use special tools, enabling quick replacement or repair of the battery module, thus shortening maintenance time and reducing operational difficulty. Furthermore, when the tray slides out of the chassis for battery replacement, the operating area is spacious, requiring no special heavy equipment; a single person can complete the work on a standard surface, reducing special requirements for site conditions and improving the convenience of battery module maintenance.

[0010] In one embodiment, the chassis further includes a locking mechanism disposed on the tray, the locking mechanism being used to lock the battery module onto the tray.

[0011] In one embodiment, the power supply device further includes an input connector and an output connector, the input connector being disposed on the chassis, the output connector being disposed on the tray and connected to the battery module, and the output connector being electrically connected to the input connector.

[0012] In one embodiment, the input connector includes a first mounting plate mounted on the chassis, the first mounting plate having a positive guide hole and a negative guide hole; the output connector includes a second mounting plate, a positive guide post, a negative guide post, and an elastic component, the second mounting plate being mounted on the tray, the positive guide post and the negative guide post passing through the second mounting plate and connected to the second mounting plate via the elastic component, so that the positive guide post and the negative guide post can float relative to the second mounting plate.

[0013] In one embodiment, the power supply device further includes a limiting member disposed on at least one of the chassis and the guide member; when the tray moves to a preset position, the limiting member engages with at least one of the tray and the battery module.

[0014] In one embodiment, the power supply device further includes a positioning element disposed on the guide element; when the tray moves to a preset position, the positioning element engages with the sliding element.

[0015] In one embodiment, the power supply device further includes a drive mechanism connected to the tray, the drive mechanism being used to drive the tray to move toward or away from the entrance / exit.

[0016] In one embodiment, the power supply device further includes a support member disposed on the chassis, the support member being used to support the battery module.

[0017] Secondly, this application also provides a heavy-duty work vehicle, including a lifting device, a work platform, and a power supply device as described in any of the above. The lifting device is located on the chassis and connected to the work platform, and the lifting device is used to drive the work platform to rise or fall.

[0018] The aforementioned heavy-duty work vehicle utilizes an entrance and exit with a door on the side wall of the chassis. This, combined with sliding components on the pallet and guide components within the receiving cavity, allows the pallet and battery modules to slide out or be pushed in as a whole along the guide direction. This pull-out structure eliminates the need to disassemble the chassis or use special tools, enabling rapid replacement or repair of battery modules, thus shortening maintenance time and reducing operational difficulty. Furthermore, when the pallet slides out of the chassis for battery replacement, the operating area is spacious, requiring no specialized heavy equipment; a single person can complete the work on standard ground, reducing special requirements for site conditions and improving the convenience of battery module maintenance.

[0019] In one embodiment, the lifting device includes a lifting mechanism and a scissor fork mechanism. One end of the lifting mechanism is connected to the chassis, and the other end is connected to the work platform. One end of the scissor fork mechanism is connected to the chassis, and the other end is connected to the work platform. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the power supply device according to an embodiment of this application.

[0021] Figure 2 for Figure 1 The diagram shown is an exploded view of the power supply device.

[0022] Figure 3 for Figure 2 The diagram shows the structure of the power supply device with the battery module located on the tray.

[0023] Figure 4 for Figure 1 The diagram shows a partial structural schematic of the power supply device.

[0024] Figure 5 for Figure 1 The front view of the power supply device shown.

[0025] Figure 6 for Figure 1 The diagram shows the power supply device from another perspective.

[0026] Figure 7 This is a schematic diagram of the input connector and output connector of a power supply device according to an embodiment of this application.

[0027] Figure 8for Figure 7 The diagram shows the input and output connectors of the power supply device from another perspective.

[0028] Figure 9 This is a schematic diagram of the structure of a heavy-duty work vehicle according to an embodiment of this application.

[0029] Figure 10 for Figure 9 The diagram shows the structure of the heavy-duty work vehicle's work platform in the lifted state.

[0030] Figure 11 This is a schematic diagram of the lifting device of a heavy-duty work vehicle according to an embodiment of this application.

[0031] Figure 12 for Figure 11 The diagram shows the structural design of the lifting device for the heavy-duty work vehicle from another perspective.

[0032] Figure 13 for Figure 11 The diagram shows a partial structural schematic of the lifting device of the heavy-duty work vehicle.

[0033] Figure 14 for Figure 13 A magnified view of a portion of point A in the middle.

[0034] Explanation of icon numbers:

[0035] 10. Power supply unit; 11. Chassis; 111. Receiving cavity; 112. Guide component; 113. Inlet / outlet; 114. Door; 12. Tray; 121. Sliding component; 13. Battery module; 15. Limiting component; 16. Input connector; 161. First mounting plate; 1611. Positive electrode guide hole; 1612. Negative electrode guide hole; 17. Output connector; 171. Second mounting plate; 172. Positive electrode guide post; 173. Negative electrode guide post; 174. Elastic component; 1741. First elastic component; 742. Second elastic element; 18. Support element; 20. Lifting device; 21. Lifting mechanism; 211. First bearing seat; 212. Second bearing seat; 213. First drive shaft; 214. Second drive shaft; 215. Bidirectional transmission distribution unit; 216. First lifting drive chain assembly; 217. Second lifting drive chain assembly; 218. Lifting column; 22. Connecting plate; 23. Third elastic element; 24. Scissor fork mechanism; 25. Base plate; 26. Top plate; 27. Drive motor; 30. Working platform. Detailed Implementation

[0036] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0037] See Figure 9 and Figure 10 One embodiment of this application provides a heavy-duty work vehicle, including a power supply device 10, a lifting device 20, and a work platform 30. The lifting device 20 is disposed on the power supply device 10 and connected to the work platform 30, and the lifting device 20 is used to drive the work platform 30 to rise or fall.

[0038] In one embodiment, see Figure 1 , Figure 2 and Figure 4 The power supply device 10 includes a chassis 11, a tray 12, and a battery module 13.

[0039] The chassis 11 is provided with a receiving cavity 111, and a guide 112 is provided inside the receiving cavity 111. The side wall of the chassis 11 along the extension direction of the guide 112 is provided with an entrance 113, which is connected to the receiving cavity 111. The entrance 113 is provided with an opening and closing door 114.

[0040] The battery module 13 is disposed on the tray 12, the tray 12 is provided with a slider 121, and the slider 121 is movably provided with a guide 112 so that the tray 12 can slide out of the chassis 11 through the inlet 113 or slide into the receiving cavity 111 through the inlet 113.

[0041] By opening an entrance 113 and installing a door 114 on the side wall of the chassis 11, and cooperating with the sliding member 121 on the tray 12 and the guide member 112 in the receiving cavity 111, the tray 12 and the battery module 13 can be slid out or pushed in as a whole along the direction of the guide member 112. This pull-out structure allows for quick replacement or repair of the battery module 13 without disassembling the chassis 11 or using special tools, which helps to shorten maintenance time and reduce operational difficulty.

[0042] The sliding member 121 and the guide member 112 slide together to provide stable and precise linear guidance for the tray 12 to enter and exit the receiving cavity 111, effectively preventing the tray 12 from tilting, shaking or getting stuck during movement, ensuring that the battery module 13 can accurately reset to the preset working position in the receiving cavity 111 each time, and avoiding poor electrical connection or mechanical interference caused by assembly deviation.

[0043] The guide 112 is built into the receiving cavity 111 of the chassis 11. After the tray 12 is fully slid in, it is located inside the chassis 11 without increasing the external outline size. The entrance 113 is located on the side wall and is closed by the door 114. After closing, the surface of the chassis 11 is flat, which is conducive to the integrated arrangement of the power supply device 10 in a limited space and improves the overall space utilization.

[0044] A door 114 is provided at the entrance / exit 113, which remains closed when not under maintenance to prevent external dust, moisture, or foreign objects from entering the receiving cavity 111, while also preventing personnel from accidentally touching internal live components, thus improving the level of electrical safety protection. In addition, when the tray 12 slides out of the chassis 11 for battery replacement, the operating area is open, facilitating the implementation of insulation protection and reducing the safety risks of working in confined spaces.

[0045] In one embodiment, see Figure 3 The sliding member 121 is a pulley, and the pulley slides in conjunction with the guide member 112.

[0046] Optionally, the guide 112 is a V-shaped guide rail, and the pulley is a V-shaped pulley adapted to the V-shaped guide rail; the V-shaped pulley is rotatably mounted on the V-shaped guide rail. This rolling engagement of the V-shaped pulley and V-shaped guide rail reduces the movement resistance during the tray 12's entry and exit, making the push-pull operation easier and less strenuous. Furthermore, the V-shaped guide rail and V-shaped pulley have self-centering characteristics; when the pulley rolls along the guide rail, the V-shaped ramp automatically guides the pulley to the center position of the guide rail, effectively preventing lateral swaying of the tray 12, further improving the alignment accuracy of the battery module 13's reset, and ensuring the reliability of the electrical connection. In addition, the large mating surface of the V-shaped guide rail and V-shaped pulley can withstand the vertical load and lateral force from the tray 12 and battery module 13, maintaining stability even under frequent pulling or vibration environments, preventing jamming or derailment.

[0047] Of course, in other embodiments, the slider is a sliding block, and the sliding block slides in conjunction with the guide 112.

[0048] In one embodiment, the chassis 11 further includes a locking mechanism. The locking mechanism is located on the tray 12 and is used to lock the battery module 13 onto the tray 12. By providing the locking mechanism, the battery module 13 is securely locked onto the tray 12, effectively suppressing displacement or shaking of the battery module 13 relative to the tray 12, avoiding poor electrical connections, mechanical collisions, or abnormal noises caused by loosening, and improving the overall structural stability.

[0049] Optionally, the locking mechanism is a screw clamping mechanism. The screw clamping mechanism includes a knob, a screw, and a pressure block. The knob is fixedly connected to the screw, the screw engages with a threaded hole on the tray 12, and the pressure block is located at the end of the screw. When the knob is rotated, the screw drives the pressure block to move downward and press against the upper surface or side wall of the battery module 13, thereby locking; rotating the knob in the opposite direction releases the lock.

[0050] Optionally, the locking mechanism includes a hydraulic cylinder or a pneumatic cylinder and a locking pin. The hydraulic cylinder or pneumatic cylinder is mounted on the tray 12, and the locking pin is connected to the piston rod of the hydraulic cylinder or pneumatic cylinder. A corresponding lock hole is provided at the position of the battery module 13. The hydraulic cylinder or pneumatic cylinder drives the locking pin to insert or retract from the lock hole, thereby achieving locking and unlocking.

[0051] Optionally, the locking mechanism includes an electromagnetic lock. The electromagnetic lock includes an electromagnet, an armature, and a latch. The electromagnet is fixed on the tray 12, and the latch is located on the battery module 13. When the electromagnet is energized, it generates a magnetic force to attract the armature or the latch, locking the battery module 13 onto the tray 12; when the power is off, the magnetic force disappears, and the latch disengages.

[0052] In one embodiment, see Figure 2 and Figure 3 The power supply unit 10 also includes an input connector 16 and an output connector 17. The input connector 16 is located on the chassis 11, and the output connector 17 is located on the tray 12 and connected to the battery module 13. The output connector 17 is electrically connected to the input connector 16. The input connector 16 is fixed to the chassis 11, and the output connector 17 moves synchronously with the tray 12 and the battery module 13. When the tray 12 carrying the battery module 13 is pushed into the receiving cavity 111 along the guide 112 to a preset position, the output connector 17 and the input connector 16 automatically connect and become conductive; when the tray 12 is pulled out, the two automatically separate. In this way, the manual plugging and unplugging of the wiring harness can be avoided every time the battery module 13 is replaced or repaired, improving maintenance efficiency.

[0053] In one embodiment, see Figure 7 and Figure 8 The input connector 16 includes a first mounting plate 161, which has a positive guide hole 1611 and a negative guide hole 1612.

[0054] The output connector 17 includes a second mounting plate 171, a positive guide post 172, a negative guide post 173, and a resilient component 174. The positive guide post 172 and the negative guide post 173 pass through the second mounting plate 171 and are connected to the second mounting plate 171 via the resilient component 174, so that the positive guide post 172 and the negative guide post 173 can float relative to the second mounting plate 171.

[0055] Specifically, the second mounting plate 171 is provided with a first through hole and a second through hole. The positive electrode guide post 172 can be movably passed through the first through hole, and the negative electrode guide post 173 can be movably passed through the second through hole.

[0056] For example, the elastic component 174 includes a first elastic element 1741 and a second elastic element 1742. Two first elastic elements 1741 are provided, respectively located on both sides of the positive electrode guide post 172. The ends of the two first elastic elements 1741 facing away from the second mounting plate 171 are connected to the positive electrode guide post 172 via a first adapter plate. Two second elastic elements 1742 are provided, respectively located on both sides of the negative electrode guide post 173. The ends of the two second elastic elements 1742 facing away from the second mounting plate 171 are connected to the negative electrode guide post 173 via a second adapter plate.

[0057] The positive electrode guide post 172 is disposed in the positive electrode guide hole 1611, and the negative electrode guide post 173 is disposed in the negative electrode guide hole 1612.

[0058] When the positive guide post 172 and the negative guide post 173 are respectively inserted into the corresponding positive guide hole 1611 and negative guide hole 1612 on the first mounting plate 161, the positive guide post 172 and the negative guide post 173, with the cooperation of the elastic component 174, generate slight displacements in the radial and axial directions. This automatically compensates for the installation deviation between the input connector 16 and the output connector 17, the manufacturing tolerance between the guide member 112 and the tray 12, or the wear gap after long-term use, ensuring that the input connector 16 and the output connector 17 can be smoothly inserted without jamming. At the same time, the elastic component 174 plays a buffering role during the contact between the guide post and the guide hole, absorbing the impact energy generated by uneven pushing speed or inertia of the tray 12, avoiding rigid collisions that cause the positive guide post 172 and the negative guide post 173 to bend or the positive guide hole 1611 and the negative guide hole 1612 to deform, thereby improving the service life and mechanical reliability of the input connector 16 and the output connector 17.

[0059] Furthermore, when the tray 12 is pulled out, the positive electrode guide post 172 and the negative electrode guide post 173 retract from the positive electrode guide hole 1611 and the negative electrode guide hole 1612, respectively. The elastic component 174 allows the positive electrode guide post 172 and the negative electrode guide post 173 to automatically return to their initial positions, facilitating the next connection. This prevents the positive electrode guide post 172 and the negative electrode guide post 173 from deviating from their central positions due to gravity or vibration over a long period, ensuring consistency and repeatability of the connection after multiple insertions and removals.

[0060] In one embodiment, see Figure 2 and Figure 5The power supply device 10 also includes a limiting member 15. The limiting member 15 is disposed on at least one of the chassis 11 and the guide member 112. When the tray 12 moves to a preset position, the limiting member 15 engages with at least one of the tray 12 and the battery module 13.

[0061] It should be noted that the number of limit components 15 can be set according to actual needs, and no specific limit is made here.

[0062] For example, see Figure 2 There are four limiting members 15, two of which are spaced apart on one side wall of the chassis 11 along the extension direction of the guide member 112, and the other two are spaced apart on the other side wall of the chassis 11 along the extension direction of the guide member 112.

[0063] When the tray 12 carrying the battery module 13 slides along the guide 112 into the receiving cavity 111 to a preset position, the limiting member 15 forms a limiting engagement with the battery module 13, providing a clear stopping position for the tray 12. This limiting prevents the tray 12 from being pushed in too much or too little due to inertia, ensuring that the electrical interface on the battery module 13 is accurately aligned with the corresponding connector in the chassis 11, improving the stability and reliability of the electrical connection. At the same time, the limiting member 15 can physically prevent the tray 12 from moving further into the receiving cavity 111, preventing the tray 12 or the battery module 13 from hitting the rear wall of the chassis 11 or other internal components, avoiding mechanical damage, deformation or short circuit caused by overtravel, and extending the service life of the power supply device 10.

[0064] Furthermore, the limiting member 15 cooperates with the locking mechanism to ensure that the tray 12 is accurately positioned, and the locking mechanism then fixes the battery module 13 onto the tray 12. In this way, the battery module 13 can be prevented from moving due to limiting failure in vibrating or tilting environments, further improving the mechanical safety and vibration resistance of the power supply device 10.

[0065] In one embodiment, the power supply device 10 further includes a positioning element. The positioning element is disposed on the guide 112. When the tray 12 moves to a preset position, the positioning element and the sliding element 121 are positioned and engaged. When the tray 12 carrying the battery module 13 slides along the guide 112 to the preset working position, the positioning element and the sliding element 121 form a positioning engagement (such as being inserted into a recess, embedded in a notch, or elastically engaged), which can effectively prevent the tray 12 from unexpectedly sliding out or moving due to vibration, tilting, or external impact, thereby improving the mechanical stability of the power supply device 10 during transportation or operation.

[0066] In one embodiment, the power supply device 10 further includes a drive mechanism. The drive mechanism is connected to the tray 12 and is used to drive the tray 12 to move toward or away from the entrance / exit 113. In this way, the tray 12 can be automatically driven to move along the guide 112 toward or away from the entrance / exit 113, replacing manual pushing and pulling operations, reducing the physical exertion of operators, and improving ease of use.

[0067] Optionally, the drive mechanism can be a lead screw module, a hydraulic cylinder, a gear and rack module, etc.

[0068] Of course, in other embodiments, the drive mechanism can also be an external drive mechanism, such as an electric robot or forklift, which docks with and pulls the pallet 12 from the outside, and the vehicle itself does not need to integrate a power source. Alternatively, a manual labor-saving mechanism, such as a worm gear crank or a clutch rack and pinion, can be used.

[0069] In one embodiment, see Figure 6 The power supply device 10 also includes a support member 18. The support member 18 is located on the chassis 11 and is used to support the battery module 13. When the tray 12 carries the battery module 13 into the receiving cavity 111 to a preset position, the support member 18 contacts the battery module 13 from the bottom or side and provides auxiliary support, thereby sharing the weight borne by the tray 12 and the sliding member 121. This helps to reduce the contact pressure and wear between the guide member 112 and the sliding member 121, and extends the service life of the moving parts.

[0070] In one embodiment, the door 114 can be a top-hinged structure. Specifically, one side of the door 114 is connected to the upper edge of the side wall of the chassis 11 via a hinge. When opened, it flips upward and can be held open by a gas spring or a strut; when closed, it closes downward and is secured by a latch. This structure occupies little lateral space and is suitable for installation in confined spaces.

[0071] Of course, in other embodiments, the door 114 can also be a horizontally sliding structure. Specifically, a horizontal slide rail is provided between the door 114 and the side wall of the chassis 11, and the door 114 can slide laterally along the slide rail to open or close the entrance 113. Alternatively, the door 114 can be a roller shutter door.

[0072] In one embodiment, see Figure 9 and Figure 10 The lifting device 20 includes a lifting mechanism 21 and a scissor fork mechanism 24. One end of the lifting mechanism 21 is connected to the chassis 11, and the other end is connected to the work platform 30. One end of the scissor fork mechanism 24 is connected to the chassis 11, and the other end is connected to the work platform 30. The lifting mechanism 21 is the power unit, used to drive the work platform 30 to lift and lower. The scissor fork mechanism 24 extends and retracts along with the work platform 30 to provide auxiliary support and guidance.

[0073] For example, see Figure 9 , Figure 10 and Figure 11 The lifting device 20 includes a base plate 25 and a top plate 26. The base plate 25 is connected to the chassis 11, and the top plate 26 is connected to the working platform 30. The lifting mechanism 21 and the scissor fork mechanism 24 are both located between the base plate 25 and the top plate 26.

[0074] Of course, in other embodiments, the lifting device 20 can also be a multi-stage telescopic hydraulic cylinder, which has a simple structure and large thrust. Alternatively, the lifting device 20 can be a lead screw and nut mechanism, which has high precision and good self-locking performance. Alternatively, the lifting device 20 can be a combination of a hinge link and an actuator cylinder.

[0075] In one embodiment, see Figure 12 and Figure 13 The lifting mechanism 21 is a rigid chain lift. Specifically, the lifting mechanism 21 includes a drive motor 27, a first bearing housing 211, a second bearing housing 212, a first drive shaft 213, a second drive shaft 214, a bidirectional transmission distribution unit 215, a first lifting drive chain assembly 216, a second lifting drive chain assembly 217, and a lifting column 218, etc. The rigid chain lift is existing technology and will not be described in detail here.

[0076] In one embodiment, see Figure 13 and Figure 14 The lifting column 218 has a connecting plate 22 at its top. The connecting plate 22 is used to connect to the working platform 30, and the lifting column 218 is connected to the connecting plate 22 via a third elastic element 23. The third elastic element 23 floats the lifting column 218 to the connecting plate 22, which, on the one hand, absorbs vibrations and impacts from the working platform 30 during lifting, preventing rigid transmission from causing severe shaking of equipment or personnel on the working platform 30, thus improving the comfort and safety of lifting. On the other hand, the third elastic element 23 can compensate for assembly errors and slight deflections between the lifting column 218 and the working platform 30, ensuring that the connecting plate 22 always maintains a uniform fit with the working platform 30, reducing additional stress caused by installation deviations, and protecting the connection structure between the lifting column 218 and the working platform 30. Furthermore, when the working platform 30 is subjected to lateral forces or uneven loads, the third elastic element 23 provides a certain degree of flexible deformation capacity, preventing the lifting column 218 from bearing excessive bending moments and extending the service life of the lifting device 20.

[0077] In one embodiment, the heavy-duty work vehicle is equipped with a safety protection system, which includes an external three-phase power supply interface, a DC fast charging interface, a lithium iron phosphate battery, a three-phase rectifier, a battery management system, a high-voltage power distribution module, a PLC main control, and communication and safety circuits, etc.

[0078] External mains power is connected via a three-phase power supply interface. After AC-DC conversion by a three-phase rectifier, the power is connected to the high-voltage power distribution unit and communication safety circuit via a high-voltage output line. Simultaneously, DC high-voltage charging of the lithium iron phosphate battery can be performed via a DC fast-charging interface. The lithium iron phosphate battery integrates total voltage and total current detection devices. The high-voltage output terminal of the battery connects to the high-voltage power distribution module to supply power to each branch device. Each branch power supply circuit is equipped with an independent circuit breaker, achieving graded circuit safety protection.

[0079] The battery management system is the core monitoring and protection component of this system. It can detect the insulation status of the high-voltage main line, the operating parameters of individual battery cells, and the overall health status in real time, and integrates multiple protection functions such as overvoltage, undervoltage, overload, overcurrent, and overtemperature. The PLC main control relies on communication and safety circuits to coordinate and link all functional units such as the three-phase rectifier and the battery management system.

[0080] This system employs dual protection logic of electrical and program interlocks to ensure reliable switching between lithium battery power supply and external mains power supply, preventing malfunctions caused by parallel operation of two power sources. The system can wake up the high-voltage circuit via a low-voltage signal and, in conjunction with the equipment's power demand, complete the high-voltage power output and branch drive power distribution. During equipment operation, the system continuously monitors key parameters such as the insulation performance of the high-voltage line, total circuit voltage, total current, and the temperature, individual cell voltage, and health status of the lithium battery. Upon detecting any abnormal operating conditions, the system will immediately disconnect the high-voltage power supply circuit. This system integrates power supply, charging, power distribution, status monitoring, and fault protection, with sophisticated control logic and a comprehensive protection system, effectively ensuring the stable and safe operation of the high-voltage electrical system of heavy-duty vehicles.

[0081] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and 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, and therefore should not be construed as a limitation of this application.

[0082] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0083] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0084] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0085] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A power supply device, characterized in that, include: The chassis has a receiving cavity, a guide member is provided in the receiving cavity, and an entrance / exit is provided on the side wall of the chassis along the extending direction of the guide member. The entrance / exit communicates with the receiving cavity and is provided with an openable and closable door. A tray, the tray being provided with a sliding member movably disposed on the guide member, so that the tray can slide out of the chassis through the inlet / outlet or slide into the receiving cavity through the inlet / outlet; and A battery module, wherein the battery module is disposed on the tray.

2. The power supply device according to claim 1, characterized in that, The chassis also includes a locking mechanism, which is located on the tray and is used to lock the battery module onto the tray.

3. The power supply device according to claim 1, characterized in that, The power supply device also includes an input connector and an output connector. The input connector is located on the chassis, and the output connector is located on the tray and connected to the battery module. The output connector is electrically connected to the input connector.

4. The power supply device according to claim 3, characterized in that, The input connector includes a first mounting plate, which is mounted on the chassis. The first mounting plate is provided with a positive guide hole and a negative guide hole. The output connector includes a second mounting plate, a positive guide post, a negative guide post, and an elastic component. The second mounting plate is mounted on the tray. The positive guide post and the negative guide post pass through the second mounting plate and are connected to the second mounting plate through the elastic component, so that the positive guide post and the negative guide post can float relative to the second mounting plate.

5. The power supply device according to claim 1, characterized in that, The power supply device further includes a limiting member, which is disposed on at least one of the chassis and the guide member; when the tray moves to a preset position, the limiting member engages with at least one of the tray and the battery module.

6. The power supply device according to claim 1, characterized in that, The power supply device also includes a positioning element, which is disposed on the guide element; when the tray moves to a preset position, the positioning element and the sliding element are positioned and engaged.

7. The power supply device according to any one of claims 1 to 6, characterized in that, The power supply device also includes a drive mechanism connected to the tray, which is used to drive the tray to move toward or away from the entrance / exit.

8. The power supply device according to any one of claims 1 to 6, characterized in that, The power supply device also includes a support member, which is located on the chassis and is used to support the battery module.

9. A heavy-duty work vehicle, characterized in that, It includes a lifting device, a work platform, and a power supply device as described in any one of claims 1 to 8, wherein the lifting device is disposed on the chassis and connected to the work platform, and the lifting device is used to drive the work platform to rise or fall.

10. The heavy-duty work vehicle according to claim 9, characterized in that, The lifting device includes a lifting mechanism and a scissor fork mechanism. One end of the lifting mechanism is connected to the chassis and the other end is connected to the working platform. One end of the scissor fork mechanism is connected to the chassis and the other end is connected to the working platform.

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