Mobile battery pack for electric vehicle

Abstract

A mobile battery pack for an electric vehicle, characterized in that the battery pack comprises a battery pack body, a mobile bracket, and a support frame, wherein the battery pack body as a whole has a drawer-like structure and can be inserted into a battery compartment of an electric vehicle, wherein the mobile bracket and the support frame are both arranged on the bottom of the battery pack body, wherein when the battery pack body is pulled out of the battery compartment, the mobile bracket and the support frame open automatically, so that the battery pack body can be moved similarly to a wheeled suitcase and placed at the roadside as desired; wherein the guide plate in the battery compartment can automatically retract the support frame when the battery pack body is inserted into the battery compartment; wherein the opening or retraction of the mobile bracket is effected by a hydraulic force.

Description

TECHNICAL AREA

[0001] The present utility model relates to the technical field of electric vehicles, in particular a mobile battery pack for electric vehicles. STATE OF THE ART

[0002] Driven by the global “dual carbon” strategy, the new energy vehicle industry is developing rapidly. With their significant advantages, such as zero emissions and high energy conversion efficiency, electric vehicles have become the driving force behind the global green transformation of transportation. According to data from the International Energy Agency (IEA), global sales of electric vehicles exceeded 14 million in 2023, a 35% increase year-on-year, and market penetration continued to grow.

[0003] As the "heart" of electric vehicles, the battery pack's performance and design directly determine the vehicle's range, power output, and safety. Currently, most electric vehicles generally use a single, fixed battery pack, with the battery pack permanently integrated into the center of the vehicle chassis. While this integrated design optimizes the vehicle's spatial arrangement and aerodynamic performance to some extent, it also introduces many technical limitations: from a repair perspective, due to the deep coupling between the battery pack and the vehicle's body structure, maintenance personnel must remove dozens of components, such as the chassis skid plate, high-voltage wiring harnesses, cooling pipes, and the like, if problems arise with the battery pack, such as individual cell damping or a failure of the battery management system.A single repair takes an average of 8 to 12 hours, and repair costs are 3 to 5 times higher than for conventional fuel-powered vehicles. Analysis of usage scenarios shows that for common vehicle use scenarios such as long-distance travel between cities and logistics transport, the current situation, where a single charging time generally exceeds 1.5 hours, significantly limits the vehicle's operational efficiency. For example, with a popular electric vehicle model, it still takes 45 minutes to charge the battery from 20% to 80% using fast charging. This contrasts sharply with the convenience of a gasoline-powered vehicle, which can be filled and driven off in 3 minutes. This has led to increased mileage anxiety among users and limited the market penetration of electric vehicles.

[0004] Due to the aforementioned weaknesses, the development of a new battery pack system with a modular design and quick-change function has become an important technical path to overcome the bottleneck in the use of electric vehicles and to improve the user experience throughout the entire life cycle. CONTENT OF THE PRESENT APPLICATION

[0005] The purpose of this utility model is to provide a mobile battery pack for electric vehicles in order to remedy the shortcomings of existing technology, wherein the battery pack has a mobile structure that is easy to replace and can effectively solve the problems of existing battery packs which are difficult to replace and cumbersome to charge.

[0006] The technical solution employed by the present utility model to solve the above technical problems is as follows: The present utility model discloses a mobile battery pack for electric vehicles, comprising a battery pack body, a mobile bracket, and a support frame, wherein the battery pack body as a whole has a drawer-like structure and can be inserted into a battery compartment of an electric vehicle; wherein the mobile bracket and the support frame are both arranged at the bottom of the battery pack body, wherein when the battery pack body is pulled out of the battery compartment, the mobile bracket and the support frame open automatically, so that the battery pack body can be moved similarly to a wheeled suitcase and placed at the roadside as desired; wherein the guide plate in the battery compartment can automatically retract the support frame when the battery pack body is inserted into the battery compartment; wherein the opening or retraction of the mobile bracket is effected by a hydraulic force.

[0007] The battery pack body of the present utility model has an overall drawer-like structure and can be inserted into the battery compartment of an electric vehicle. When the charge is almost depleted, the user simply drives to a battery exchange station, opens the battery compartment, removes the battery pack, and replaces it. This eliminates the need for time-consuming disassembly work, making the exchange process convenient and quick. This effectively solves the problem of the difficulty of changing conventional battery packs. Furthermore, since the mobile mounting bracket of the battery pack body can be opened, the battery pack body can be moved much like a suitcase, making the battery pack easy and convenient to transport.

[0008] The mobile support comprises a support body and a roller, wherein the support body is hinged to the bottom of the battery pack body, and the roller is mounted at an end of the support body facing away from the battery pack body; wherein the support frame comprises a support body and support feet, the support body being hinged to the bottom of the battery pack body and the support feet being arranged at an end of the support body facing away from the battery pack body.

[0009] The articulated connection between the mounting body, support body, and battery pack body allows the mobile mount and support frame to be rotated, opened, and retracted. The support feet increase the contact area with the ground and improve stability when the unit is parked.

[0010] In a further development, the mounting body comprises two symmetrically arranged pivot arms in the shape of a "7", located on both sides of the battery pack body, each pivot arm comprising a long pivot arm and a short pivot arm, with an angle formed between the long and short pivot arms; a positioning plate is connected between two long pivot arms, and a connecting rod is provided between two short pivot arms, connecting the two pivot arms to each other; the pivot point for linkage to the battery pack body is provided at one end of the short pivot arm; and the roller is arranged at the end of the long pivot arm opposite the short pivot arm.wherein the hydraulic drive force is generated by a hydraulic cylinder, wherein a piston rod of the hydraulic cylinder is connected via a drive swivel device to one end of the short swivel arm and the rear end of the hydraulic cylinder is articulated to the battery pack body, wherein the action of the hydraulic cylinder via the drive swivel device causes the mounting body to rotate; wherein the connecting rod is supported appropriately in the positioning groove of the positioning seat on the bottom of the battery pack body when the mounting body is in the open position.

[0011] The "7" shape of the swivel arm ensures better force application to the mounting body, while the positioning plate and connecting rod increase the overall rigidity of the mounting body and ensure stability during movement. The connection between the hydraulic cylinder and the swivel arm enables efficient power transmission and ensures reliable rotation of the mounting body.

[0012] In a further training, it is provided that the drive swivel device is a swivel plate which is attached to the short swivel arm, with the piston rod end of the hydraulic cylinder being articulated to the swivel plate.

[0013] By adjusting the swivel plate, the contact area between the hydraulic cylinder and the short swivel arm is increased, making the power transmission more even and stable and preventing damage to the components from excessive local force; at the same time, the joint connection ensures the flexibility of the hydraulic cylinder during operation, thus ensuring smooth rotation of the mounting body.

[0014] The front of the battery pack body is provided with a first receiving groove for receiving the positioning plate of the mobile mount, wherein both sides of the front are provided with second receiving grooves for receiving the swivel arm of the mobile mount and third receiving grooves for receiving the roller, wherein the bottom is provided with a fourth receiving groove for receiving the support frame, wherein the positioning plate is fully received in the first receiving groove and the roller is fully received in the third receiving grooves when the swivel arms of the mobile mount are fully received in the second receiving grooves on both sides of the front of the battery pack body, wherein the support frame is fully received in the fourth receiving groove when retracted.By providing the first, second, third and fourth mounting grooves, the mobile bracket and support frame can be accommodated when the battery pack body is mounted in the battery compartment, thus avoiding interference with the normal installation and use of the battery pack.

[0015] A hinge shaft is provided at one end of the support body, opposite the support feet. Both ends of the hinge shaft are guided in two spherical bearings. A torsion spring is also mounted on the hinge shaft, exerting an elastic force on the support arm that always acts in an opening direction. By adjusting the torsion spring, a continuous elastic force can be provided to open the support frame, ensuring that when the battery pack body is pulled out of the battery compartment, the support frame opens reliably and automatically without additional manual operation.

[0016] The front of the battery pack body features a foldable pull handle that can be raised or lowered. A pressure block is integrated into the handle to press the positioning plate into the first receiving groove. Raising the handle allows for convenient movement of the battery pack. When lowered, the handle covers and encloses the swivel arms, providing some protection for both the arms and the battery pack body. The foldable design of the handle enhances application flexibility, while the pressure block ensures the stability of the positioning plate when in the raised position. The protective cover function when lowered extends the service life of the swivel arms.

[0017] The ground clearance of the battery pack body and the ground clearance of the battery compartment are identical when the support frame and mobile bracket are in the open position, whereby the battery installation process can be completed simply by sliding the battery pack into the battery compartment when the battery pack body is moved into the battery compartment position using the pull handle, which is labor-saving and easy.

[0018] A carrying handle is also provided on the top of the front of the battery pack body for lifting the entire battery pack body; and a locking structure is provided on the carrying handle to lock the battery pack body to the battery compartment when the battery pack body is inserted into the battery compartment.

[0019] The locking mechanism is built into the carrying handle and comprises a left locking tongue and a right locking tongue, as well as a button. The left and right locking tongues are symmetrically distributed, with a return spring located between them. Each end of the left locking tongue and each end of the right locking tongue are provided with an angled block. The button has an angled groove that corresponds to and is fitted to the angled block. When the button is pressed, the inner wall of the angled groove drives the angled block, causing the left and right locking tongues to move towards each other and exit the locking hole of the battery compartment.which unlocks the battery compartment; wherein the elastic force of the return spring causes the left locking tongue and the right locking tongue to move left and right respectively when the button loses its pressure force, wherein the inclined block has a counterforce on the inner wall of the inclined groove, so that the button springs outwards and is reset, wherein the left locking tongue and the right locking tongue are now inserted into the locking hole of the battery compartment and thus locked.

[0020] This locking mechanism is easy to use and can be unlocked by simply pressing; it locks automatically as soon as the hand is released, thus ensuring a reliable connection between the battery pack and the battery compartment.

[0021] The battery pack body is equipped with an electrical interface for connection to the electric vehicle, and this interface is protected by a dust cover. The electrical interface is used to establish the electrical connection between the battery pack body and the electric vehicle and to supply power to the electric vehicle. The dust cover prevents dust and dirt from entering the electrical interface, thus ensuring the reliability of the electrical connection.

[0022] The guide plate is positioned inside the battery compartment at a point facing the inlet, and the side of the guide plate facing the interior of the battery compartment is angled. This angled design allows for smoother contact with the support frame. When the battery pack is inserted, the support frame is gradually pressed into the corresponding groove by the guiding action of the angled surface, thus achieving automatic retraction.

[0023] The positive effects of the utility model are: The battery pack body of the present utility model has an overall drawer-like structure and can be inserted into the battery compartment of an electric vehicle. When the charge is almost depleted, the user simply needs to drive to a battery exchange station, open the battery compartment, remove the battery pack, and replace it. This eliminates the need for time-consuming disassembly work, making the exchange process convenient and quick, thus effectively solving the problem of the difficulty of changing conventional battery packs.

[0024] The present utility model provides a mobile bracket and a support frame on the base of the battery pack body. When the battery pack body is pulled out of the battery compartment, both open automatically. The mobile bracket allows the battery pack to be moved like a wheeled suitcase, making it easy to transport and replace. The support frame allows the battery pack to be placed at the roadside as needed, increasing convenience and safety during use.

[0025] The mobile bracket in the utility model is opened and retracted using a hydraulic drive. This hydraulic drive is powerful and stable, ensuring reliable operation of the mobile bracket. Simultaneously, in conjunction with an elastic return element, it achieves a smoother opening process. The swivel arm structure in the shape of a "7" and the arrangement of the positioning plate and connecting rod improve the rigidity and stability of the bracket body.

[0026] The linkage design of the swivel plate and the hydraulic cylinder or piston rod in the drive swivel device increases the uniformity of the power transmission and the flexibility of the action, avoids damage to components due to excessive local force application and extends the service life of the equipment.

[0027] The division into the first receiving groove, the second receiving groove, the third receiving groove and the fourth receiving groove enables the precise fitting of the components of the mobile holder and the support frame, and the design of the sloping surface of the guide plate allows the two to be automatically retracted when the battery pack body is inserted into the battery compartment, thus eliminating manual operation and improving the level of automation.

[0028] The torsion spring on the support body provides continuous spring force for opening the support frame, thus ensuring automatic and reliable opening; the foldable pull handle combines functions such as easier mobility and component protection, and the pressure block ensures stable mounting of the positioning plate; the design for equal ground clearance makes assembly simple and labor-saving; the carrying handle allows for easy transport, and the locking structure ensures secure assembly.

[0029] The locking mechanism features a design incorporating the interaction of the left locking tongue, the right locking tongue, and a button, whereby the driving action of the angled block and the angled groove achieves convenient unlocking and locking, operation is simple, and the locking mechanism is reliable, ensuring that the battery pack is securely mounted in the battery compartment.

[0030] The guide structure ensures the stability of the battery pack body when pulled out; the dust cover at the electrical interface ensures the reliability of the electrical connection; symmetrically distributed support frames improve stability when setting down.

[0031] In summary, the utility model has a reasonable structure, is easy and quick to replace, has a high degree of automation, is stable and reliable in use, can effectively improve the user experience of electric vehicles, and has high practical value. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a three-dimensional representation of a mobile holder of a mobile battery pack for an electric vehicle of the present utility model in a withdrawn state from a perspective; Fig. 2 is a three-dimensional representation of a mobile holder of a mobile battery pack for an electric vehicle of the present utility model in a withdrawn state from another perspective; Fig. Figure 3 is a three-dimensional exploded view of a mobile holder of a mobile battery pack for an electric vehicle of the present utility model in a withdrawn state; Fig. Figure 4 is a three-dimensional representation of a mobile holder for a mobile battery pack for an electric vehicle of the present utility model in an open state from a perspective; Fig. Figure 5 is a three-dimensional representation of a mobile holder of a mobile battery pack for an electric vehicle of the present utility model in an open state from another perspective; Fig. Figure 6 is a partial structural exploded view of a mobile holder for a mobile battery pack for an electric vehicle of the present utility model; Fig. Figure 7 is a three-dimensional exploded view of a locking structure of a mobile battery pack for an electric vehicle of the present utility model from one perspective; Fig. Figure 8 is a three-dimensional exploded view of a locking structure of a mobile battery pack for an electric vehicle of the present utility model from a different perspective; Fig. Figure 9 is a three-dimensional representation of a guide plate of a mobile battery pack for an electric vehicle of the present utility model. DETAILED DESCRIPTION

[0032] The utility model is described in more detail below in conjunction with the attached drawings and specific embodiments: with reference to Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 to Fig.9. The present utility model presents a mobile battery pack for electric vehicles, and the overall design takes into account ease of use and structural stability and consists of three core components: a battery pack body 1, a mobile bracket 2, and a support frame 3. The battery pack body 1 has an innovative drawer-like structure, this design adapts precisely to the battery compartment of the electric vehicle and enables seamless insertion.At the top front of the battery pack body 1 is an ergonomically shaped carrying handle with a non-slip textured surface, ensuring a comfortable and secure grip for the operator when lifting the entire battery pack body 1. The foldable pull handle 4, mounted on the front, is made of a high-strength aluminum alloy with an anodized finish. It is not only aesthetically pleasing and durable but also features a clever mechanical design that effectively distributes the forces exerted during pulling, allowing for easy movement of the battery pack. To reduce costs, it can, of course, also be molded from a single piece of plastic.

[0033] The mobile mount 2 and the support frame 3 are key components for the battery pack, enabling flexible movement and stable placement. Both are located on the base of the battery pack body 1. The mobile mount 2 consists of a mount body 5 and a roller 6. The mount body 5 and the base of the battery pack body 1 are articulated via a high-strength hinge shaft 7. This connection method can withstand high external forces while ensuring rotational flexibility. The roller 6 is made of highly elastic rubber and is internally equipped with high-precision bearings that provide shock absorption and noise reduction, allowing it to run smoothly on a variety of road surfaces. The mount body 5 includes two symmetrically arranged 7"-shaped swivel arms 7, one on each side of the battery pack body 1.A specific angle is formed between the long swivel arm 8 and the short swivel arm 9 of the swivel arm 7, and this angle is mechanically precisely calculated to ensure that it reliably supports the battery pack in the unfolded position. The two long swivel arms 8 are connected to each other by a positioning plate 10, which is provided with several reinforcing ribs to increase the overall structural strength. The connecting rod 11 between the two short swivel arms 9 is also made of high-strength material, further improving the stability of the mounting body 5. The opening and closing of the mobile mounting bracket 2 is driven by a hydraulic drive system, the core component of which is a hydraulic cylinder 12. The piston rod 13 of this cylinder is connected to the short swivel arm 9 via a drive swivel device.A custom-designed swivel plate 14 serves as the drive swivel device. The swivel plate 14 is precision-machined and connected to the end of the piston rod 13 via a wear-resistant hinge. Under load, a hydraulic force is efficiently transmitted to the end of the piston rod 13, pressing the mounting body 5 to achieve smooth rotation. When the mounting body 5 is in the open position, the connecting rod is precisely fitted and supported in the positioning groove 16 of the lower positioning seat 15 of the battery pack body 1. The positioning seat 15 is made of cast steel and is formed in one piece. It is firmly connected to the base 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.To improve the strength of the positioning groove 16, a wear-resistant padding layer made of copper alloy can be embedded in the groove, effectively reducing the coefficient of friction between the connecting rod and the positioning seat 15, reducing wear and deformation after prolonged use, so that the bracket body 5 forms a stable support structure in the open state and remains stable even when moving on uneven roads; in addition, the positioning seat 15 can also serve as the hinge base for an articulated connection between the mobile bracket 2 and the battery pack body 1.

[0034] The support frame 3 consists of a support body 17 and support feet 18. The support body 17 is also pivotally connected to the base of the battery pack body 1, and a high-precision positioning sleeve is located at the pivot point to ensure the rotational accuracy of the support body 17. The base of the support foot 18 is made of non-slip rubber material and features unique groove patterns to further improve friction with the ground. A hinge shaft is mounted at one end of the support body 17 opposite the support foot 18, with each end of the shaft guided in two spherical bearings that have been heat-treated to ensure the reliability of the connection. The torsion spring 34 mounted on the hinge shaft has been specially processed and has a stable coefficient of elasticity, which can impart a continuous and stable torsional spring force to the support body 17 in the opening direction.In the present embodiment, a support frame 3 is distributed in the centerline position on the bottom of the battery pack body 1 and, together with the two rollers 6, forms a stable triangular support structure that significantly improves the stability of the battery pack when parked.

[0035] To achieve compact storage of the individual components of the battery pack when not in use, the battery pack body 1 features a carefully designed structure. The first receiving groove 19 on the front is precisely sized to accommodate the positioning plate 10 and may be additionally lined internally with a damping padding layer to prevent damage from impacts when the positioning plate 10 is inserted. The second receiving groove 20 and the third receiving groove 21 on both sides of the front each accommodate the swivel arm 7 and the roller 6, respectively. When the battery pack body 1 is in the battery compartment, the piston rod 13 of the hydraulic cylinder 12 is compressed and stores elastic potential energy. When the battery pack body 1 is removed from the battery compartment, the piston rod 13 releases potential energy, and the mobile mounting bracket 2 opens rapidly.

[0036] The pull handle 4 is designed to be both practical and protective. It can be flexibly raised and lowered and also features a pressure block 22 at a specific position. The pressure block 22 is made of high-strength engineering plastic and has a non-slip surface. When the pull handle 4 is lowered, the pressure block 22 precisely presses the positioning plate 10 into the first receiving groove 19, thus preventing the positioning plate 10 from loosening or shifting. Simultaneously, the lowered pull handle 4 completely covers and encloses the swivel arm 7, providing physical protection for both the swivel arm 7 and the battery pack body 1, and preventing damage from external collisions during transport or storage.

[0037] The integrated locking mechanism on the carrying handle 23 is a key component for ensuring that the battery pack body 1 is securely connected to the battery compartment. The mechanism comprises a left locking tongue 24, a right locking tongue 25, and a button 26. The left and right locking tongues are made of a high-strength alloy material with a hardened surface, exhibiting excellent wear and corrosion resistance. The two tongues are symmetrically positioned on the left and right, and the centrally located return spring 27 undergoes rigorous elasticity tests to ensure that the locking tongues reliably return to their locked and unlocked positions.At one end of the left locking tongue 24 facing the right locking tongue 25 and at the other end of the right locking tongue 25 facing the left locking tongue 24, both are provided with an angled block 28, and the button 26 is correspondingly provided with an angled groove 29 that fits the angled block 28. When the operator presses the button 26, the inner wall of the angled groove 29 interacts with the angled block 28 and generates a horizontal force component that causes the left locking tongue 24 and the right locking tongue 25 to move towards each other, thereby disengaging the locking tongue from the locking hole of the battery compartment and enabling quick unlocking. When the button 26 is no longer subjected to pressure, the return spring 27 releases its elastic force and pushes the left locking tongue 24 and the right locking tongue 25 to the left and right respectively.On the right, the inclined block 28 and the inner wall of the inclined groove 29 generate a counterforce, causing the button 26 to automatically spring up and reset. At this point, the locking tongue is inserted precisely into the locking hole of the battery compartment to complete the secure locking mechanism.

[0038] The electrical interface (not shown in the figure) on the battery pack body 1 is water- and dust-proof. Normally, the dust cap on the electrical interface (not shown in the figure) is tightly closed to effectively prevent the ingress of dust and water vapor, thus ensuring the reliability of the electrical connection.

[0039] The guide plate 31, located in the battery compartment at a point facing the inlet, has a carefully designed inclined surface 32 on one side facing the interior of the battery compartment. The angle of the inclined surface 32 is optimized through several simulation experiments. When the battery pack body 1 is inserted into the battery compartment, the inclined surface 32 of the guide plate 31 can be in gentle contact with the support frame 3, and the gradually applied pressure gently pushes the support frame 3 into the fourth receiving groove 33 and automatically retracts it, thus simplifying the battery pack assembly process.

[0040] When the battery pack body 1 is pulled out of the battery compartment during use, the torsion spring 34 quickly releases its elastic force, automatically opening the support frame 3 and initially supporting the battery pack. Simultaneously, the hydraulic drive system starts rapidly, the hydraulic cylinder 12 pushes the support body 5 inward, and the mobile bracket 2 unfolds quickly. At this point, the entire battery pack body 1 has a shape resembling a wheeled suitcase, allowing the operator to easily move it along the road using the pull handle and set it down stably in any suitable position. The support frame 3 and the mobile bracket 2 are now fully open. Due to precise engineering, the ground clearance of the battery pack body 1 matches the ground clearance of the battery compartment.This design allows the operator to quickly complete the battery installation process by simply pressing the battery pack into the battery compartment, significantly improving the convenience and efficiency of battery replacement.

[0041] When the battery pack body 1 is inserted into the battery compartment, the inclined surface 32 of the guide plate 31 in 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 groove 33, thus achieving automatic retraction; simultaneously, the battery compartment also exerts a pressure on the mounting body 5, thus balancing the force of the hydraulic cylinder 12, so that the swivel arm 7 of the mobile mount 2 is stably received in the second receiving groove 20, ensuring that the positioning plate 10 is fully received in the first receiving groove 19 and the roller 6 is fully received in the third receiving groove 21, and that the entire receiving process is smooth and accurate.Finally, the operator only needs to press button 26 on the carrying handle, whereupon the locking structure reacts quickly and the battery pack body 1 and the battery compartment are firmly locked and combined to ensure that the battery pack maintains a stable and reliable connection state during vehicle operation.

[0042] The mobile battery pack for electric vehicles provided in the embodiments of the present utility model is presented in detail above, and the principle and embodiment of the utility model are described in detail in this article with reference to specific examples. The description of the embodiments above serves only to aid understanding of the technical solution disclosed by the present utility model; at the same time, the concept of the present utility model reveals changes in the specific implementation methods and the scope of application for the person skilled in the art in this field, and in summary, the content of this specification is not to be understood as a limitation of the present utility model.

Claims

[1] Mobile battery pack for electric vehicle, characterized by that the battery pack comprises a battery pack body, a mobile bracket, and a support frame, wherein the battery pack body as a whole has a drawer-like structure and can be inserted into a battery compartment of an electric vehicle, wherein the mobile bracket and the support frame are both arranged at the bottom of the battery pack body, wherein when the battery pack body is pulled out of the battery compartment, the mobile bracket and the support frame open automatically, so that the battery pack body can be moved similarly to a wheeled suitcase and placed at the roadside as desired; wherein the guide plate in the battery compartment can automatically retract the support frame when the battery pack body is inserted into the battery compartment; wherein the opening or retraction of the mobile bracket is effected by a hydraulic force. [2] Mobile battery pack for electric vehicle according to claim 1, characterized by that the mobile support comprises a support body and a roller, wherein the support body is hinged to the bottom of the battery pack body, and the roller is mounted at an end of the support body facing away from the battery pack body; wherein the support frame comprises a support body and support feet, the support body being hinged to the bottom of the battery pack body and the support feet being arranged at an end of the support body facing away from the battery pack body; wherein a hinge shaft is provided at an end of the support body facing away from the support feet, with both ends of the hinge shaft each being guided in two spherical bearings, and wherein a torsion spring is also mounted on the hinge shaft, which exerts an elastic force on the support arm, always acting in an opening direction. [3] Mobile battery pack for electric vehicle according to claim 2, characterized bythat the mounting body comprises two symmetrically arranged pivot arms in the shape of a "7" located on both sides of the battery pack body, each pivot arm comprising a long pivot arm and a short pivot arm, with an angle formed between the long pivot arm and the short pivot arm; wherein a positioning plate is connected between two long pivot arms and a connecting rod is provided between two short pivot arms, so that the two pivot arms are connected to each other; wherein the pivot point for linkage to the battery pack body is provided at one end of the short pivot arm; wherein the roller is arranged at the end of the long pivot arm furthest from the short pivot arm;wherein the hydraulic drive force is generated by a hydraulic cylinder, wherein a piston rod of the hydraulic cylinder is connected via a drive swivel device to one end of the short swivel arm and the rear end of the hydraulic cylinder is articulated to the battery pack body, wherein the action of the hydraulic cylinder via the drive swivel device causes the mounting body to rotate; wherein the connecting rod is supported appropriately in the positioning groove of the positioning seat on the bottom of the battery pack body when the mounting body is in the open position. [4] Mobile battery pack for electric vehicle according to claim 3, characterized by , that the drive swivel device is a swivel plate attached to the short swivel arm, with the piston rod end of the hydraulic cylinder being articulated to the swivel plate. [5] Mobile battery pack for electric vehicle according to claim 3, characterized by, that the front of the battery pack body is provided with a first receiving groove for receiving the positioning plate of the mobile mount, wherein both sides of the front are provided with second receiving grooves for receiving the swivel arm of the mobile mount and third receiving grooves for receiving the roller, wherein the bottom is provided with a fourth receiving groove for receiving the support frame, wherein the positioning plate is fully received in the first receiving groove and the roller is fully received in the third receiving grooves when the swivel arms of the mobile mount are fully received in the second receiving grooves on both sides of the front of the battery pack body, wherein the support frame is fully received in the fourth receiving groove when retracted. [6] Mobile battery pack for electric vehicle according to claim 5, characterized by, that a foldable pull handle is provided on the front of the battery pack body, which can be raised or lowered, and wherein a pressure block is provided on the carrying handle to press the positioning plate into the first receiving groove; wherein the battery pack can be moved conveniently by raising the pull handle, wherein, when the pull handle is lowered, it covers and encloses the swivel arms and also provides some protection for the swivel arms and the battery pack body. [7] Mobile battery pack for electric vehicle according to claim 1, characterized by, that the ground clearance of the battery pack body and the ground clearance of the battery compartment match when the support frame and mobile bracket are in the open position, whereby the battery installation process can be completed simply by sliding the battery pack into the battery compartment when the battery pack body is moved into the battery compartment position using the pull handle. [8] Mobile battery pack for electric vehicle according to claim 1, characterized by , that a carrying handle is also provided on the top of the front of the battery pack body for lifting the entire battery pack body; and wherein a locking structure is provided on the carrying handle to lock the battery pack body to the battery compartment when the battery pack body is inserted into the battery compartment. [9] Mobile battery pack for electric vehicle according to claim 8, characterized by, that the locking structure is built into the carrying handle and comprises a left locking tongue and a right locking tongue and a button, wherein the left locking tongue and the right locking tongue are distributed symmetrically left-right and a return spring is located between the two, wherein an end of the left locking tongue facing the right locking tongue and an end of the right locking tongue facing the left locking tongue are each provided with an inclined block, wherein the button is provided with an inclined groove that is associated with and adapted to the inclined block, wherein when the button is pressed, the inner wall of the inclined groove drives the inclined block, causing the left locking tongue and the right locking tongue to move towards each other and the left locking tongue and the right locking tongue now exit the locking hole of the battery compartment,which unlocks the battery compartment; wherein the elastic force of the return spring causes the left locking tongue and the right locking tongue to move left and right respectively when the button loses its pressure force, wherein the inclined block has a counterforce on the inner wall of the inclined groove, so that the button springs outwards and is reset, wherein the left locking tongue and the right locking tongue are now inserted into the locking hole of the battery compartment and thus locked. [10] Mobile battery pack for electric vehicle according to claim 1, characterized by that the guide plate is located at a point inside the battery compartment facing the inlet and that the side of the guide plate facing the inside of the battery compartment is an inclined surface.

Images