A mobile battery pack for an electric vehicle

Abstract

The utility model discloses a mobile battery pack for electric automobile, including battery pack main part, mobile support and support frame, the battery pack main part whole presents the drawer type structure, can be inserted in the battery compartment of electric automobile, mobile support and support frame all set up in battery pack main part bottom, when battery pack main part is taken out from the battery compartment, mobile support and support frame open automatically, make battery pack main part can move like the like pull -and -push suitcase, and can be at random and stop in the roadside, when battery pack main part inserts into the battery compartment, the guide plate in the battery compartment can make support frame automatic folding, the opening or folding of mobile support is under the action of hydraulic power. The utility model realizes battery pack quick replacement, and moves laborsaving convenient, and the stable and reliable structure effectively promotes electric automobile battery replacement efficiency and use convenience.

Description

Technical Field

[0001] This utility model relates to the field of electric vehicle technology, and in particular to a mobile battery pack for electric vehicles. Background Technology

[0002] The new energy vehicle industry is developing rapidly with a booming momentum. Electric vehicles, with their significant advantages of zero emissions and high energy conversion efficiency, have become a core force in the global green transformation of transportation. According to data from the International Energy Agency (IEA), global electric vehicle sales exceeded 14 million units in 2023, a year-on-year increase of 35%, and market penetration continued to climb.

[0003] As the heart of an electric vehicle, the battery pack's performance and design directly determine the vehicle's range, power output, and safety. Currently, mainstream electric vehicles generally adopt a single fixed battery pack design, rigidly integrating the battery pack into the middle of the vehicle's chassis. While this integrated design optimizes vehicle space layout and aerodynamic performance to some extent, it also exposes many technical bottlenecks: From a maintenance perspective, when problems such as individual cell degradation or battery management system failure occur, due to the deep coupling between the battery pack and the vehicle structure, maintenance personnel need to disassemble dozens of components such as chassis guard plates, high-voltage wiring harnesses, and cooling pipes. A single repair takes an average of 8-12 hours, and the maintenance cost is 3-5 times higher than that of traditional fuel vehicles. From a usage scenario analysis perspective, in high-frequency usage scenarios such as intercity long-distance travel and logistics transportation, the current situation where a single charging time generally exceeds 1.5 hours severely restricts the vehicle's operational efficiency. Taking a popular pure electric vehicle as an example, it still takes 45 minutes to charge the battery from 20% to 80% in fast charging mode. This is in stark contrast to the convenience of refueling a gasoline car in just 3 minutes, which exacerbates users' range anxiety and limits the market penetration of electric vehicles.

[0004] Based on the above pain points, developing a new type of battery pack system with modular design and quick replacement function has become a key technical path to break through the bottleneck of electric vehicle use and improve the user's experience throughout the entire life cycle. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a mobile battery pack for electric vehicles. This battery pack adopts a mobile structure, which is convenient for replacement and can effectively solve the problems of difficult replacement and inconvenient charging of existing battery packs.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0007] This utility model discloses a mobile battery pack for electric vehicles, including a battery pack body, a mobile bracket, and a support frame. The battery pack body has a drawer-like structure and can be inserted into the battery compartment of an electric vehicle. The mobile bracket and support frame are both located at the bottom of the battery pack body. When the battery pack body is pulled out of the battery compartment, the mobile bracket and support frame automatically open, allowing the battery pack body to move like a suitcase and be parked at will on the roadside. When the battery pack body is inserted into the battery compartment, a guide plate inside the battery compartment allows the support frame to automatically retract. The opening or retraction of the mobile bracket is controlled by hydraulic power.

[0008] The battery pack of this invention adopts a drawer-type structure and can be inserted into the battery compartment of an electric vehicle. When the power is about to run out, the user only needs to drive into the battery swapping station, open the battery compartment, and pull out the battery pack for replacement. There is no need for complicated disassembly work, and the replacement process is convenient and quick, effectively solving the problem of existing battery packs being difficult to replace. Moreover, because the movable bracket of the battery pack body can be opened, the battery pack body can be moved like a push-pull suitcase, making it easy and convenient to move the battery pack.

[0009] The movable support includes a support body and rollers. The support body is hinged to the bottom of the battery pack body, and the rollers are installed at the end of the support body away from the battery pack body. The support frame includes a support body and support feet. The support body is hinged to the bottom of the battery pack body, and the support feet are located at the end of the support body away from the battery pack body.

[0010] The hinged connection between the bracket body, the support body, and the battery pack body enables the movable bracket and support frame to rotate, open, and retract. The support feet can increase the contact area with the ground and improve stability when parked.

[0011] Furthermore, the support body includes two symmetrically arranged "7"-shaped swing arms, located on both sides of the battery pack body. Each swing arm includes a long swing arm and a short swing arm, with an included angle between them. A positioning plate connects the two long swing arms, and a connecting rod connects the two short swing arms, thus connecting the two swing arms together. The hinge point with the battery pack body is located at one end of the short swing arm. A roller is located at the end of the long swing arm away from the short swing arm. The hydraulic power is a hydraulic rod, and the piston rod on the hydraulic rod is connected to one end of the short swing arm through a driving swing device. The tail end of the hydraulic rod is hinged to the battery pack body. Through the action of the hydraulic rod, the driving swing device pushes the support body to rotate. When the support body is in the open state, the connecting rod is matched and supported in the positioning groove of the positioning seat at the bottom of the battery pack body.

[0012] The “7” shaped swing arm structure design makes the force on the support body more reasonable. The positioning plate and connecting rod enhance the overall rigidity of the support body and ensure stability during movement. The connection between the hydraulic rod and the swing arm realizes efficient power transmission and ensures reliable rotation of the support body.

[0013] Furthermore, the driving swing device is a swing plate fixed on a short swing arm, and the piston rod end of the hydraulic rod is hinged to the swing plate.

[0014] The swing plate increases the contact area between the hydraulic rod and the short swing arm, making the force transmission more uniform and stable, avoiding component damage caused by excessive local stress. At the same time, the hinged connection ensures the flexibility of the hydraulic rod during operation, ensuring that the bracket body can rotate smoothly.

[0015] The front of the battery pack body has a first receiving groove for accommodating a positioning plate for a movable bracket. The two sides of the front have second receiving grooves for accommodating the swing arms of the movable bracket and third receiving grooves for accommodating rollers. The bottom has a fourth receiving groove for accommodating a support frame. When the swing arms of the movable bracket are fully retracted into the second receiving grooves on the two sides of the front of the battery pack body, the positioning plate is fully retracted into the first receiving groove, and the rollers are fully retracted into the third receiving groove. When the support frame is retracted, it is fully retracted into the fourth receiving groove. The arrangement of the first, second, third, and fourth receiving grooves allows the movable bracket and support frame to be stored away when the battery pack body is installed in the battery compartment, preventing them from interfering with the normal installation and use of the battery pack.

[0016] A hinge shaft is provided at one end of the support body away from the support foot. The two ends of the hinge shaft are respectively threaded onto two hinge seats. A torsion spring is also fitted onto the hinge shaft, providing a spring force that keeps the support arm rotating in the opening direction. The torsion spring provides a continuous spring force for opening the support frame, ensuring that the support frame can reliably and automatically open when the battery pack body is removed from the battery compartment, without requiring additional manual operation.

[0017] The front of the battery pack body is equipped with a flip-up handle that can be lifted or lowered. The handle also features a retaining block that presses the positioning plate against the first receiving groove. When the handle is lifted, the battery pack can be easily moved; when lowered, the handle covers and encloses the swing arm, providing some protection for both the swing arm and the battery pack body. The flip-up design of the handle increases usability, the retaining block ensures the stability of the positioning plate when stored, and the protective covering when lowered extends the lifespan of the swing arm.

[0018] When the support frame and movable bracket are in the open state, the distance between the battery pack body and the ground is consistent with the distance between the battery compartment and the ground. This allows the battery pack body to be moved to the battery compartment position by the handle, and the battery installation operation can be completed simply by pushing the battery pack into the battery compartment, which is labor-saving and simple.

[0019] The front top of the battery pack body is also provided with a handle for lifting the entire battery pack body; and a locking structure is provided on the handle for locking the two together when the battery pack body is inserted into the battery compartment.

[0020] The locking structure is built into the handle and includes a left latch, a right latch, and a button. The left and right latches are symmetrically distributed and have a return spring between them. The left latch near the right latch and the right latch near the left latch each have a wedge. The button has a groove that matches the wedge. When the button is pressed, the inner wall of the groove drives the wedge, causing the left and right latches to move in opposite directions. At this time, the left and right latches leave the lock hole of the battery compartment, i.e., unlocking. When the button is no longer pressed, the spring force causes the left and right latches to move to the left and right respectively. The wedge exerts a reverse force on the inner wall of the groove, causing the button to spring back to its original position. At this time, the left and right latches insert into the lock hole of the battery compartment, i.e., locking.

[0021] This locking mechanism is easy to operate; it can be unlocked with a simple press and automatically locked when released, ensuring the reliability of the connection between the battery pack and the battery compartment.

[0022] The battery pack body is provided with an electrical interface for electrical connection with an electric vehicle, and a dust cover is provided at the electrical interface. The electrical interface is used to realize the electrical connection between the battery pack body and the electric vehicle and to provide power to the electric vehicle; the dust cover can prevent dust, debris and other objects from entering the electrical interface and ensure the reliability of the electrical connection.

[0023] The guide plate is located inside the battery compartment near the entrance, with an inclined surface on the side facing inwards. This inclined surface design allows for smoother contact with the support frame. During the insertion of the battery pack body, the inclined surface guides the support frame gradually into the corresponding receiving slot, achieving automatic retraction.

[0024] The beneficial effects of this utility model are:

[0025] The main body of the battery pack of this utility model adopts a drawer-type structure, which can be inserted into the battery compartment of an electric vehicle. When the power is about to run out, the user only needs to drive into the battery swapping station, open the battery compartment, and take out the battery pack for replacement. There is no need to perform complicated disassembly work. The replacement process is convenient and quick, effectively solving the problem that existing battery packs are not easy to replace.

[0026] This utility model features a movable bracket and a support frame at the bottom of the battery pack body. When the battery pack body is pulled out of the battery compartment, both automatically open. The movable bracket allows the battery pack to be moved like a push-pull suitcase, making it convenient to transport and replace. The support frame ensures that the battery pack can be parked anywhere on the roadside, improving the convenience and safety during use.

[0027] The movable support in this invention uses hydraulic power to open or retract. The hydraulic drive provides high power and smooth operation, ensuring reliable movement of the movable support. Furthermore, the elastic reset component makes the opening process smoother. The "7"-shaped swing arm structure, positioning plate, and connecting rod enhance the rigidity and stability of the support body.

[0028] The hinged design of the swing plate and the hydraulic piston rod in the drive swing device increases the uniformity of force transmission and the flexibility of movement, avoids damage to components due to excessive local stress, and extends the service life of the equipment.

[0029] The partitioned arrangement of the first, second, third, and fourth receiving slots enables precise storage of all components of the movable bracket and support frame. The inclined surface design of the guide plate allows the battery pack to be automatically retracted when it is inserted into the battery compartment, eliminating the need for manual operation and improving the level of automation.

[0030] The torsion spring on the support body provides continuous elasticity for the support frame to open, ensuring its automatic and reliable opening; the flip-up handle combines convenient movement with component protection, and the pressure block ensures the stable storage of the positioning plate; the design of the same distance from the ground makes installation labor-saving and simple; the handle is convenient for carrying and the locking structure ensures stable installation.

[0031] The locking structure uses a combination of left and right locking tongues and buttons. It achieves convenient unlocking and locking through the driving action of inclined blocks and inclined slots. The operation is simple and the locking is reliable, ensuring the stable installation of the battery pack in the battery compartment.

[0032] The guide structure ensures the smoothness of the battery pack body during the pulling process; the dust cover at the electrical interface ensures the reliability of the electrical connection; and the symmetrically distributed support frame improves the stability of the docking.

[0033] In summary, this utility model has a reasonable structural design, is easy and quick to replace, has a high degree of automation, and is stable and reliable in use. It can effectively improve the user experience of electric vehicles and has high practical value. Attached Figure Description

[0034] Figure 1 This is a perspective view of the mobile support for the mobile battery pack for electric vehicles of this utility model in a retracted state.

[0035] Figure 2 This is a perspective view of the mobile support for the mobile battery pack for electric vehicles of this utility model in a retracted state.

[0036] Figure 3 This is an exploded perspective view of the mobile support frame for the mobile battery pack of electric vehicles in a retracted state.

[0037] Figure 4 This is a perspective view of the mobile support for the mobile battery pack for electric vehicles of this utility model in an open state.

[0038] Figure 5 This is a perspective view of the mobile support for the mobile battery pack for electric vehicles of this utility model in an open state.

[0039] Figure 6 This is a partial exploded view of the mobile support frame for a mobile battery pack for electric vehicles according to this utility model.

[0040] Figure 7 This is a perspective exploded view of the locking structure of the mobile battery pack for electric vehicles according to this utility model.

[0041] Figure 8 This is an exploded perspective view of the locking structure of the mobile battery pack for electric vehicles according to this utility model.

[0042] Figure 9 This is a perspective view of the guide plate for the mobile battery pack for electric vehicles according to this utility model. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0044] Please see Figures 1 to 9 This utility model provides a mobile battery pack for electric vehicles. The overall design fully considers ease of operation and structural stability, and consists of three core components: the battery pack body 1, the mobile bracket 2, and the support frame 3. The battery pack body 1 innovatively adopts a drawer-type structure, which can precisely fit the battery compartment of the electric vehicle for seamless insertion. An ergonomically designed handle with a non-slip textured surface is located on the top front of the battery pack body 1, ensuring a comfortable and stable grip when lifting the entire battery pack body 1. The front-mounted flip-up handle 4 is made of high-strength aluminum alloy with an anodized surface, making it not only aesthetically pleasing and durable but also effectively dispersing force when pulled through its clever mechanical structure, easily moving the battery pack. Of course, to reduce costs, it can be made of a single piece of plastic.

[0045] The movable bracket 2 and support frame 3, as key components for the flexible movement and stable docking of the battery pack, are both located at the bottom of the battery pack body 1. The movable bracket 2 consists of a bracket body 5 and rollers 6. The bracket body 5 is hinged to the bottom of the battery pack body 1 via a high-strength hinge shaft 7. This connection method ensures rotational flexibility while withstanding significant external impacts. The rollers 6 are made of highly elastic rubber and equipped with high-precision bearings, providing shock absorption and noise reduction, and can operate smoothly on various road surfaces. The bracket body 5 includes two symmetrically arranged "7"-shaped swing arms 7, located on both sides of the battery pack body 1. The long swing arm 8 and the short swing arm 9 of the swing arms 7 form a specific angle, which has been precisely calculated mechanically to ensure reliable support for the battery pack in the deployed state. The two long swing arms 8 are connected by a positioning plate 10, which has multiple reinforcing ribs to enhance the overall structural strength. The connecting rod 11 between the two short swing arms 9 is also made of high-strength material, further improving the stability of the bracket body 5. The opening and closing of the movable support 2 is driven by a hydraulic power system. The core component, the hydraulic rod 12, has a piston rod 13 connected to the short swing arm 9 via a drive swing device. The drive swing device is a custom-made swing plate 14, which is precision-machined and connected to the end of the piston rod 13 via a wear-resistant hinge. This allows for efficient transmission of hydraulic power, enabling the support body 5 to rotate smoothly. When the bracket body 5 is in the open state, the connecting rod is precisely matched and supported in the positioning groove 16 of the positioning seat 15 at the bottom of the battery pack body 1. The positioning seat 15 is made of cast steel and is firmly connected to the bottom of the battery pack body 1 by high-strength bolts. The inner wall of the positioning groove 16 is precision ground and its cross-sectional shape perfectly matches the circular cross-section of the connecting rod. In order to improve the strength of the positioning groove 16, a wear-resistant copper alloy pad can be embedded in the groove, which can effectively reduce the friction coefficient between the connecting rod and the positioning seat 15, reduce wear and deformation after long-term use, and make the bracket body 5 form a stable support structure in the open state, so that it can remain stable even when moving on uneven roads. In addition, the positioning seat 15 can also serve as a hinge seat for the movable bracket 2 and the battery pack body 1.

[0046] The support frame 3 consists of a support body 17 and support feet 18. The support body 17 is also hinged to the bottom of the battery pack body 1, and a high-precision positioning sleeve is provided at the hinge to ensure the accuracy of the rotation of the support body 17. The bottom of the support feet 18 is made of non-slip rubber and has a unique groove pattern to further enhance the friction with the ground. A hinge shaft is installed at the end of the support body 17 away from the support feet 18. The two ends of the shaft are respectively mounted on two heat-treated and reinforced hinge seats to ensure the reliability of the connection. The torsion spring 34 sleeved on the hinge shaft is specially processed to have a stable elastic coefficient, which can provide a continuous and stable rotational elastic force for the support body 17 in the opening direction. In this embodiment, one support frame 3 is distributed at the center line of the bottom of the battery pack body 1, forming a stable triangular support structure with the two rollers 6, which greatly improves the stability of the battery pack when parked.

[0047] To achieve compact storage of all components of the battery pack when not in use, the battery pack body 1 features a carefully designed structural layout. The first receiving slot 19 on the front side is precisely matched in size to the positioning plate 10, and can also be equipped with a cushioning layer inside to prevent damage to the positioning plate 10 during storage. The second receiving slots 20 and the third receiving slots 21 on both sides of the front side are used to accommodate the swing arm 7 and the roller 6, respectively. When the battery pack body 1 is located inside the battery compartment, the piston rod 13 of the hydraulic rod 12 is in a compressed state, storing elastic potential energy; when the battery pack body 1 is pulled out of the battery compartment, the piston rod 13 releases the potential energy, assisting the movable support 2 to open quickly.

[0048] The handle 4 is designed to be both practical and protective. It can be lifted and lowered flexibly, and it also has a pressing block 22 at a specific position. The pressing block 22 is made of high-strength engineering plastic with a non-slip surface. When the handle 4 is lowered, the pressing block 22 can accurately press the positioning plate 10 into the first receiving groove 19 to prevent the positioning plate 10 from loosening or shifting. At the same time, the lowered handle 4 can completely cover and wrap around the swing arm 7, providing physical protection for the swing arm 7 and the battery pack body 1, and avoiding damage from external collisions during transportation or storage.

[0049] The locking structure built into the handle 23 is a key component ensuring a secure connection between the battery pack body 1 and the battery compartment. This structure includes a left locking tongue 24, a right locking tongue 25, and a button 26. The left and right locking tongues are made of high-strength alloy material with a hardened surface, exhibiting excellent wear resistance and corrosion resistance. They are symmetrically distributed, and the return spring 27 in the middle has undergone rigorous elasticity testing to ensure reliable return of the locking tongues in both unlocked and locked states. A wedge 28 is provided at the end of the left locking tongue 24 near the right locking tongue 25, and at the end of the right locking tongue 25 near the left locking tongue 24. The button 26 has a corresponding inclined groove 29 that matches the wedge 28. When the operator presses button 26, the inner wall of the inclined groove 29 interacts with the inclined block 28 to generate a horizontal force, which drives the left latch 24 and the right latch 25 to move towards each other, thereby disengaging the latch from the lock hole of the battery compartment and achieving quick unlocking. When button 26 is no longer pressed, the return spring 27 releases its elasticity, pushing the left latch 24 and the right latch 25 to move to the left and right respectively. The inclined block 28 and the inner wall of the inclined groove 29 generate a counterforce, causing button 26 to automatically spring back and reset. At this time, the latch is precisely inserted into the lock hole of the battery compartment, completing a secure lock.

[0050] The electrical interface (not shown in the figure) on the main body 1 of the battery pack adopts a waterproof and dustproof design. Normally, the dust cover at the electrical interface (not shown in the figure) is tightly closed to effectively prevent dust and moisture from entering and ensure the reliability of the electrical connection.

[0051] The guide plate 31 located near the entrance in the battery compartment has a carefully designed inclined surface 32 on the side facing the inside of the battery compartment. The angle of this inclined surface 32 has been optimized through multiple simulation experiments. When the battery pack body 1 is inserted into the battery compartment, the inclined surface 32 of the guide plate 31 can make smooth contact with the support frame 3, and through gradually applied pressure, smoothly press the support frame 3 into the fourth receiving slot 33, achieving automatic retraction and simplifying the battery pack installation process.

[0052] During battery pack use, when the battery pack body 1 is pulled out of the battery compartment, the torsion spring 34 quickly releases its elastic force, driving the support frame 3 to automatically open and provide initial support for the battery pack. Simultaneously, the hydraulic drive system quickly activates, the hydraulic rod 12 pushes the bracket body 5 to rotate, and the movable bracket 2 quickly unfolds. At this point, the entire battery pack body 1 resembles a push-pull suitcase, allowing the operator to easily move it on the ground using the handle and achieve stable stopping at any suitable location. With the support frame 3 and movable bracket 2 fully open, the precise design ensures that the distance between the battery pack body 1 and the ground is consistent with the distance between the battery compartment and the ground. This design allows the operator to quickly complete the battery installation operation by simply pushing the battery pack into the battery compartment when moving it to the battery compartment position, greatly improving the convenience and efficiency of battery replacement.

[0053] When the battery pack body 1 is inserted into the battery compartment, the inclined surface 32 of the guide plate 31 inside the battery compartment first contacts the support frame 3. As the battery pack is inserted deeper, the guide plate 31 gradually presses the support frame 3 into the fourth receiving slot 33, achieving automatic retraction. At the same time, the battery compartment also pushes the bracket body 5, counteracting the force of the hydraulic rod 12, thereby smoothly storing the swing arm 7 of the movable bracket 2 in the second receiving slot 20, ensuring that the positioning plate 10 is completely stored in the first receiving slot 19 and the roller 6 is completely stored in the third receiving slot 21. The entire storage process is smooth and precise. Finally, the operator only needs to press the button 26 on the handle, and the locking structure will quickly act to firmly lock the battery pack body 1 and the battery compartment together, ensuring that the battery pack maintains a stable and reliable connection during vehicle operation.

[0054] The above provides a detailed description of the mobile battery pack for electric vehicles provided by the embodiments of this utility model. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the technical solutions disclosed in this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

[0055] The locking structure built into the handle 23 ensures a secure connection between the battery pack body 1 and the battery compartment. As those skilled in the art can understand, there may be changes in the specific implementation and application scope based on the concept of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A mobile battery pack for electric vehicles, characterized in that: The device includes a battery pack body, a movable bracket, and a support frame. The battery pack body has a drawer-like structure and can be inserted into the battery compartment of an electric vehicle. The movable bracket and support frame are both located at the bottom of the battery pack body. When the battery pack body is pulled out of the battery compartment, the movable bracket and support frame automatically open, allowing the battery pack body to be moved like a push-pull suitcase and parked at will on the roadside. When the battery pack body is inserted into the battery compartment, a guide plate inside the battery compartment allows the support frame to automatically retract. The opening and retraction of the movable bracket is controlled by hydraulic power.

2. A mobile battery pack for electric vehicles according to claim 1, characterized in that: The movable support includes a support body and rollers. The support body is hinged to the bottom of the battery pack body, and the rollers are installed at the end of the support body away from the battery pack body. The support frame includes a support body and support feet. The support body is hinged to the bottom of the battery pack body, and the support feet are located at the end of the support body away from the battery pack body. A hinge shaft is provided at the end of the support body away from the support feet. The two ends of the hinge shaft are respectively passed through two hinge seats. A torsion spring is also sleeved on the hinge shaft. The torsion spring exerts a spring force on the support arm, which is always rotating in the open direction.

3. A mobile battery pack for electric vehicles according to claim 2, characterized in that: The support body includes two symmetrically arranged "7"-shaped swing arms located on both sides of the battery pack body. Each swing arm consists of a long swing arm and a short swing arm, which are at an angle to each other. A positioning plate connects the two long swing arms, and a connecting rod connects the two short swing arms, thus linking the two swing arms together. The hinge point with the battery pack body is located at one end of the short swing arm. A roller is located at the end of the long swing arm away from the short swing arm. The hydraulic power is a hydraulic rod, and the piston rod on the hydraulic rod is connected to one end of the short swing arm via a driving swing device. The tail end of the hydraulic rod is hinged to the battery pack body. Through the action of the hydraulic rod, the driving swing device pushes the support body to rotate. When the support body is in the open state, the connecting rod is matched and supported in the positioning groove of the positioning seat at the bottom of the battery pack body.

4. A mobile battery pack for electric vehicles according to claim 3, characterized in that: The driving swing device is a swing plate fixed on a short swing arm, and the piston rod end of the hydraulic rod is hinged to the swing plate.

5. A mobile battery pack for electric vehicles according to claim 3, characterized in that: The front side of the battery pack body is provided with a first receiving groove for accommodating a positioning plate for accommodating a movable bracket. The two sides of the front side are provided with a second receiving groove for accommodating a swing arm of the movable bracket and a third receiving groove for accommodating a roller. The bottom is provided with a fourth receiving groove for accommodating a support frame. When the swing arm of the movable bracket is completely retracted into the second receiving grooves on both sides of the front side of the battery pack body, the positioning plate is completely retracted into the first receiving groove and the roller is completely retracted into the third receiving groove. When the support frame is retracted, it is completely retracted into the fourth receiving groove.

6. A mobile battery pack for electric vehicles according to claim 5, characterized in that: The front side of the battery pack body is provided with a flip-up handle, which can be lifted or lowered, and a pressing block is provided on the handle to press the positioning plate against the first receiving groove; when the handle is lifted, the battery pack can be moved easily, and when the handle is lowered, it becomes a cover to wrap around the swing arm, which also plays a certain role in protecting the swing arm and the battery pack body.

7. A mobile battery pack for electric vehicles according to claim 1, characterized in that: When the support frame and movable bracket are in the open state, the distance between the battery pack body and the ground is consistent with the distance between the battery compartment and the ground. This allows the battery pack body to be moved to the battery compartment position by the handle, and the battery installation operation can be completed simply by pushing the battery pack into the battery compartment.

8. A mobile battery pack for electric vehicles according to claim 1, characterized in that: The front top of the battery pack body is also provided with a handle for lifting the entire battery pack body; and a locking structure is provided on the handle for locking the two together when the battery pack body is inserted into the battery compartment.

9. A mobile battery pack for an electric vehicle according to claim 8, characterized in that: The locking structure is built into the handle and includes a left latch, a right latch, and a button. The left and right latches are symmetrically distributed and have a return spring between them. The left latch near the right latch and the right latch near the left latch each have a wedge. The button has a groove that matches the wedge. When the button is pressed, the inner wall of the groove drives the wedge, causing the left and right latches to move in opposite directions. At this time, the left and right latches leave the lock hole of the battery compartment, i.e., unlocking. When the button is no longer pressed, the spring force causes the left and right latches to move to the left and right respectively. The wedge exerts a reverse force on the inner wall of the groove, causing the button to spring back to its original position. At this time, the left and right latches insert into the lock hole of the battery compartment, i.e., locking.

10. A mobile battery pack for an electric vehicle according to claim 1, characterized in that: The guide plate is located inside the battery compartment near the entrance, and the side of the guide plate facing the inside of the battery compartment is inclined.

Images