Mobile device optimized for replaceable battery scheme

Abstract

Generally, a recharging process of a battery powered mobile device involves driving or otherwise moving the mobile device to a location of a stationary recharging station, and recharging a battery of the mobile device at the recharging station. During the time of travel and recharging, the mobile device does not perform tasks on site. The disclosed embodiments eliminate or reduce the need to transport a mobile device to a recharging station. In particular, the disclosed embodiments include a frame that enables quick replacement of the battery pack in the field. Embodiments may include a mobile element and / or a mobile battery replacement system to facilitate replacement that may transport a battery pack to and from a mobile device on site.

Description

Technical Field

[0001] Embodiments described herein relate generally to replacing battery packs, and more particularly to mobile devices optimized for replacing battery packs at industrial sites. Background Art

[0002] In some industrial environments such as construction, mining, agriculture, forestry, etc., battery-powered mobile devices may be operated in remote locations (e.g., off-highway locations where there is no supporting infrastructure). Access to these sites can potentially be a complex task due to several factors unique to these environments. Mobile devices are often operated under harsh and dynamic conditions, requiring continuous use throughout the day. The process of recharging the batteries of such mobile devices can be time consuming. Therefore, it becomes expensive for businesses to operate an efficient recharging process.

[0003] Traditionally, industrial sites may have limited infrastructure for charging mobile devices. The availability and placement of charging stations requires careful planning to ensure convenient access and avoid congestion. In addition, the power supply capacity at these locations may be limited, requiring careful management of energy sources to prevent overloading the electrical infrastructure or causing power outages.

[0004] Additionally, the mobility of the equipment itself presents logistical challenges. Mobile devices may need to be transferred to charging stations, which requires efficient coordination and management of operations to avoid interruptions or delays in workflow. The diversity of mobile devices used in industrial sites further complicates the recharging process.

[0005] The present disclosure is directed to overcoming one or more problems discovered by the inventors. Summary of the invention

[0006] In an embodiment, a battery replacement assembly includes a frame configured to support a battery pack, wherein the frame includes: a main body; two arms extending from the main body, wherein each of the two arms includes a first end connected to the main body, and a second end; and a removable reinforcement between the second ends of the two arms.

[0007] In an embodiment, a battery replacement assembly includes: a frame configured to support a battery pack, wherein the frame includes a main body, two arms extending from the main body, wherein each of the two arms includes a first end connected to the main body, and a second end, and a removable reinforcement between the second ends of the two arms; a moving system, wherein the moving system includes two or more moving elements, wherein each of the two or more moving elements includes a cylinder barrel, a piston rod configured to extend outward from the cylinder barrel and retract inward into the cylinder barrel, and an attachment point at the end of the piston rod, and wherein each attachment point is configured to attach to the battery pack; a first traction motor, the first traction motor is connected to a first arm of the two arms; a first ground engaging member, the first ground engaging member is driven by the first traction motor; a second traction motor, the second traction motor is connected to a second arm of the two arms; and a second ground engaging member, the second ground engaging member is driven by the second traction motor.

[0008] In an embodiment, a battery replacement system includes a mobile device, the mobile device including a frame configured to support a battery pack, wherein the frame includes a main body, two arms extending from the main body, wherein each of the two arms includes a first end connected to the main body, and a second end, and a removable reinforcement, the removable reinforcement extending across an area between the second ends of the two arms; and a mobile battery replacement system, the mobile battery replacement system including a platform configured to move vertically and / or horizontally, wherein the platform is configured to engage the battery pack and transport the battery pack through the area between the second ends of the two arms when the removable reinforcement is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The details of embodiments of the present disclosure, both as to its structure and operation, may be gleaned in part by studying the accompanying drawings, in which like reference numerals refer to like parts, and in which:

[0010] Figure 1 shows a side view of an electric mobile device according to an embodiment;

[0011] Figure 2 A top-down schematic diagram of a battery pack within an electric mobile device according to an embodiment is shown;

[0012] Figure 3A and 3B A vertical movement system for a battery pack according to an embodiment is shown;

[0013] Figure 4A and 4B shows a horizontal movement system for a battery pack according to an embodiment; and

[0014] Figures 5A-5C A separate system for moving a battery pack is shown according to an embodiment. DETAILED DESCRIPTION

[0015] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various embodiments, and is not intended to represent the only embodiments that can practice the present disclosure. In order to provide a thorough understanding of the embodiments, the detailed description includes specific details. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0016] In some cases, in order to make the description concise, well-known structures and components are shown in simplified form. For clarity and ease of explanation, some surfaces and details may be omitted in this specification and the accompanying drawings. It should also be understood that the various components shown herein are not necessarily drawn to scale. In other words, the features disclosed in the various embodiments can be implemented using relative dimensions within and between components that are different from those shown in the accompanying drawings.

[0017] Figure 1 A side view of an electric mobile device 100 according to an embodiment is shown. The mobile device 100 is shown as a wheel loader. However, the mobile device 100 can be any device powered by an onboard battery pack. Other examples of the mobile device 100 include, but are not limited to, excavators, dump trucks, asphalt pavers, backhoe loaders, skid steers, crawler loaders, cold planers, compactors, bulldozers, electric rope shovels, forestry machines, hydraulic mining shovels, material processors, motor graders, pipelayers, road reclaimers, telescopic loaders, tractor scrapers, etc. The mobile device 100 can be operated by a person (e.g., locally or remotely) and / or by an autonomous system.

[0018] In the illustrated example, the mobile device 100 includes a rear portion 110 and a front portion 120, the front portion including a work tool 125. The front portion 120 can be articulated relative to the rear portion 110 by means of a joint 112, so that the front portion 120 can rotate within a certain range of angles relative to the rear portion 110 about an axis A. However, it should be understood that the disclosed embodiments do not require the mobile device 100 to include an articulated front portion 120. In an alternative example, the mobile device 100 can include non-articulated front and rear portions (e.g., a single integrated body frame).

[0019] The mobile device 100 may include at least one, and typically a plurality of, ground engaging members 130. The ground engaging members 130 are shown as wheels. In alternative embodiments, the ground engaging members 130 may include a track or a pair of tracks. More generally, the ground engaging member(s) 130 may include any mechanism for supporting the mobile device 100 above the ground and preferably moving the mobile device 100 relative to the ground.

[0020] The rear portion 110 of the mobile device 100 includes a rear bumper 114 on the rear end. The rear portion 110 also includes a rear frame 140, which supports a battery pack 150. The rear frame 140 can be formed into a u-shape or angled ends. The U-shaped frame 140 can allow the battery pack 150 to be disconnected and lowered directly to the ground below the mobile device 150, allowing the mobile device to be pulled forward, and then backed up to the next battery pack 150 and install it. The angled end frame 140 can allow the battery pack 150 to be lowered / slid off the mobile device 100 and reach the ground, and the mobile device then drives and picks up the next battery pack 150. The battery pack 150 provides power for the mobile device 100, including powering the motor (s) that drives the (s) ground engaging member (s) 130, the work tool 125, the electronic control unit (ECU), the electronic devices in the cockpit, etc.

[0021] Figure 2 A top-down schematic diagram of a battery pack 150 within an electric mobile device 100 according to an embodiment is shown. The battery pack 150 can be mounted within the frame 140. For example, the battery pack 150 can be mounted in the center of the frame 140 for uniform weight distribution. In an embodiment, the frame 140 is separated around the battery pack 150 to accommodate the significant size of the battery pack 150. In particular, the frame 140 can include two arms 142A and 142B. Each of the two arms 142A and 142B includes a first end connected to the body 144, and a second end at the rear of the frame 140.

[0022] As used herein, a reference numeral without an additional letter but having the same numerical portion as a reference numeral with an additional letter will be used to generally refer to that component. For example, the term "arm 142" may refer to arm 142A or arm 142B, and the term "arm 142" may refer collectively to arms 142A and 142B.

[0023] In an embodiment, the frame 140 also includes a reinforcement member 146. The reinforcement member 146 can be positioned at the rear of the battery pack 150, between the rear ends of the arms 142A and 142B. When inserted between the rear ends of the arms 142A and 142B, the reinforcement member 146 supports the arms 142A and 142B outwardly. In particular, the reinforcement member 146 supports the arms 142 to resist bending or other forces that may cause the arms 142 to twist inwardly or otherwise collapse.

[0024] In an embodiment, the reinforcement 146 may also extend vertically across the bottom of the battery pack 150. Thus, in addition to providing support to the arm 142, the reinforcement 146 may also prevent the battery pack 150 from moving (e.g., translating) toward the rear of the mobile device 100. Additionally, the reinforcement 146 may cover the rear of the mobile device 100 to prevent the battery pack 150 from being exposed to the external environment of the mobile device 100.

[0025] The reinforcement 146 may be removable. For example, the reinforcement 146 may be configured to slide out through the rear end of the mobile device 100 between the portions 114A and 114B of the rear bumper 114. In this case, the reinforcement 146 may be completely separated from the frame 140. Alternatively, the reinforcement 146 may be rotated horizontally outward or vertically upward or downward without being completely separated from the frame 140. In this case, the reinforcement 146 may be connected to the frame 140 via a hinge or other joint mechanism. In either case, whether completely separable or not, the reinforcement 146 may be removable from the space between the arms 142A and 142B, thereby providing access to the compartment in the rear portion 110 of the mobile device 100 in which the battery pack 150 is installed. When between the arms 142A and 142B, the reinforcement 146 may be fastened to the frame 140 in any known manner, thereby preventing removal. For example, the reinforcement 146 may be fastened to the frame 140 via bolts, screws, clips, latches, etc.

[0026] In an embodiment, the size of the battery pack 150 prevents the axle from being placed between the ground engaging members 130A and 130B on the rear portion 110. In this case, each ground engaging member 130 on the rear portion 110 can be powered by a discrete traction motor 135. For example, the ground engaging member 130A can be powered by the traction motor 135A, and the ground engaging member 130B can be powered by the traction motor 135B. Each traction motor 135 can utilize motor reduction and active suspension.

[0027] Figure 3A and 3BA vertical movement system 300 for a battery pack 150 according to an embodiment is shown. The vertical movement system 300 may include one or more vertical movement elements 350, which are shown as a pair of vertical movement elements, for example, a first vertical movement element 350A near the front end of the battery pack 150 and a second vertical movement element 350B near the rear end of the battery pack 150. It should be understood that the same pair of vertical movement elements 350 can be positioned on opposite sides of the battery pack 150 to provide a total of four vertical movement elements 350 near each corner of the battery pack 150. The specific location of the vertical movement elements 350 is not limiting. However, for stability purposes, it is generally envisioned that the vertical movement elements 350 will be positioned near each corner of the battery pack 150, whether on the front side, lateral side, and / or rear side of the battery pack 150.

[0028] like Figure 3A As shown in , each vertical moving element 350 can be a cylinder (e.g., a hydraulic cylinder) or an electric actuator. In particular, each vertical moving element 350 includes a cylinder barrel 352, a piston rod 354, and an attachment point 356. For example, the first vertical moving element 350A includes a cylinder barrel 352A, a piston rod 354A, and an attachment point 356A, and the second vertical moving element 350B includes a cylinder barrel 352B, a piston rod 354B, and an attachment point 356B. Each piston rod 354 can extend out of a corresponding cylinder barrel 352 and contract into a corresponding cylinder barrel, and each attachment point 356 can be physically connected to the battery pack 150 using any known attachment mechanism (e.g., bolts, screws, etc.). Each cylinder barrel 352 can be fixed to the frame 140 or other components of the rear portion 110 of the mobile device 100.

[0029] Each vertical moving element 350 can be operated synchronously with each other vertical moving element 350. When each piston rod 354 extends from the cylinder barrel 352, the battery pack 150 gradually descends vertically downward and leaves the rear portion 110 by virtue of the connection between the battery pack 150 and the attachment point 356, as shown in FIG. Figure 3B Once on the ground G, the battery pack 150 can be separated from the attachment point 356, thereby removing the battery pack 150 from the mobile device 100. Once removed, the mobile device 100 can be moved forward and / or the battery pack 150 can be moved backward, thereby separating the mobile device 100 and the battery pack 150 so that the battery pack 150 can be maintained (e.g., recharged, repaired, etc.).

[0030] Instead, a new or recharged battery pack 150 can be positioned on the ground G below the rear portion 110 (e.g., by moving the mobile device 100 rearward over the battery pack 150 and / or moving the battery pack 150 from the rear end below the mobile device 100) and coupled to the attachment point 356. Then, as each piston rod 354 is retracted into the cylinder barrel 352, the battery pack 150 is gradually lifted vertically upward into the rear portion 110 by virtue of the connection between the battery pack 150 and the attachment point 356. Once lifted, the battery pack 150 can be secured to an appropriate position within the rear portion 110 via any coupling mechanism (e.g., bolts, screws, etc.).

[0031] As an alternative to removing and / or inserting the battery pack 150 from below the rear portion 110, the battery pack 150 can be removed and / or inserted from above the rear portion 110. In this case, each piston rod 354 extends vertically upward out of the cylinder barrel 352 to lift the battery pack 150 vertically upward and away from the rear portion 110 by virtue of the connection between the battery pack 150 and the attachment point 356. Once exposed to the external environment above the rear portion 110, the battery pack 150 can be coupled to a crane or other system (possibly including a mobile battery replacement system as described elsewhere herein) and separated from the attachment point 356, thereby removing the battery pack 150 from the mobile device 100. Once the battery pack 150 has been removed, the mobile device 100 can be moved forward and / or the battery pack 150 can be moved away from the mobile device 100 by virtue of another system (e.g., a crane, a mobile battery replacement system, etc.), thereby separating the mobile device 100 and the battery pack 150 so that the battery pack 150 can be maintained (e.g., recharged, repaired, etc.).

[0032] Figure 4A and 4B A horizontal movement system 400 for a battery pack 150 according to an embodiment is shown. The horizontal movement system 400 may include one or more horizontal movement elements 450, which are shown as at least one horizontal movement element 450 near the front end of the battery pack 150. It should be understood that the same horizontal movement element 450 can be positioned on opposite sides of the battery pack 150 to provide a total of two horizontal movement elements 450 near the front end of the battery pack 150. The specific location of the horizontal movement element 450 is not limiting. However, for force distribution purposes, it is generally contemplated that the horizontal movement element 450 will be positioned on either side of the battery pack 150, whether near the front or rear of the battery pack 150.

[0033] like Figure 4AAs shown in , each horizontal moving element 450 can be a cylinder (e.g., a hydraulic cylinder) or an electric actuator. In particular, each horizontal moving element includes a cylinder barrel 452, a piston rod 454, and an attachment point 456. Each piston rod 454 can extend out of the corresponding cylinder barrel 452 and retract into the corresponding cylinder barrel, and each attachment point 456 can be physically connected to the battery pack 150 using any known attachment mechanism (e.g., bolts, screws, etc.). Each cylinder barrel 452 can be fixed to the frame 140 or other components of the rear portion 110 of the mobile device 100.

[0034] Each horizontal moving element 450 can be operated synchronously with each other horizontal moving element 450. As each piston rod 454 extends from the cylinder barrel 452, the battery pack 150 gradually slides horizontally across the surface 440 of the frame 140 by virtue of the connection between the battery pack 150 and the attachment point 456, and with the reinforcement 146 removed, slides across the rear bumper 114 and slides onto the loading platform 460, as shown in FIG. Figure 4B Once on the loading station 460 , the battery pack 150 can be detached from the attachment point 456 , thereby removing the battery pack 150 from the mobile device 100 .

[0035] Instead, a new or recharged battery pack 150 can be positioned on a loading platform 460 proximate the rear bumper 114 and coupled to the attachment points 456. Then, as each piston rod 454 is retracted into the cylinder barrel 452, the battery pack 150 is gradually pulled horizontally inward through the rear bumper 114 and across the surface 440 of the frame 140 by virtue of the connection between the battery pack 150 and the attachment points 456 until the battery pack 150 is seated in a final position in the frame 140. Once seated, the battery pack 150 can be secured to an appropriate position within the rear portion 110 via any coupling mechanism (e.g., bolts, screws, etc.). In some embodiments, when combined with an angled end frame 140, the battery pack 150 can be achieved by an angled movement system. Figure 4A-4B Movement of the battery pack 150 is shown. For example, the movement of the battery pack 150 in conjunction with the angled end frame 140 includes both a horizontal component and a vertical component, so that the battery pack 150 can slide off the frame 140 and onto the frame at a non-zero angle relative to the ground G. For example, the corresponding cylinders and / or electric actuators associated with the angled movement system can be at a non-zero angle relative to the horizontal axis.

[0036] Figures 5A-5CA separate mobile battery replacement system 500 for moving a battery pack 150 is shown according to an embodiment. The mobile battery replacement system 500 may include a movable platform 510. The platform 510 may be configured to move vertically and / or horizontally. In an embodiment, the platform 510 includes a forklift. In particular, the platform 510 may include one or more forks that engage with corresponding receptacles on the battery pack 150. The corresponding receptacles may include a pallet structure configured to be lifted by a forklift. In alternative embodiments, the platform 510 may dock with the battery pack 150 in any other suitable manner. Figure 5A As shown in , when the reinforcement 146 is removed, the mobile battery swap system 500 can align the interface of the platform 510 with the corresponding interface of the battery pack 150.

[0037] Then, if Figure 5B As shown in , the mobile battery replacement system 500 can move the platform 510 toward the mobile device 100 (eg, forward), thereby engaging the interface of the platform 510 with the interface of the battery pack 150. At the same time, the battery pack 150 can be released from the frame 140.

[0038] like Figure 5C As shown in , with the platform 510 engaged with the battery pack 150, the mobile battery replacement system 500 can be moved (e.g., backward) away from the mobile device 100, thereby removing the battery pack 150 from the frame 140. The platform 510 can use gravity to generate friction and pull the battery pack 150 out of the mobile device 100. Additionally or alternatively, the battery pack 150 can be fastened to the platform 510, thereby securing the battery pack 150 to the platform 510. Additionally or alternatively, the platform 510 can include a lifting mechanism (e.g., powered by a hydraulic system, a pneumatic system, or an electrical system) that enables controlled raising and lowering of the battery pack 150 relative to the frame 140. The lifting mechanism can include an actuator, a motor, or other device that generates the necessary force to lift the battery pack 150 from the frame 140.

[0039] The platform 510 can be designed to firmly hold and manipulate the battery pack 150 during the extraction process. For example, the battery pack 150 can be fixed to the platform 510 for transportation using bolts, clamps or other fastening mechanisms. In order to maintain stability and effectively distribute the weight of the battery pack 150, the platform 510 can be designed to have load distribution features and structural reinforcements that are suitable for the size of the battery pack 150. These features minimize the flexure or torsion of the platform 510 during the lifting process and provide stability when handling the battery pack 150. The platform 510 can include control and safety features such as limit switches, sensors or feedback mechanisms to monitor the position, load and stability of the battery pack 150. In addition, safety mechanisms such as locking mechanisms or fail-safe devices can be integrated into the platform 510 to prevent accidental release or falling of the battery pack 510.

[0040] Conversely, a new or recharged battery pack 150 can be installed in the frame 140 using a reverse procedure. In particular, the battery pack 150 can be positioned on the platform 510 and proximate the rear portion 110 by the mobile battery replacement system 500 so as to align the battery pack 150 with the frame 140 with the reinforcement 146 removed. The mobile battery replacement system 500 can then be moved toward the mobile device 100 to insert the battery pack 150 into the frame 140. The battery pack 150 can be loosened from the platform 510 and / or secured to the frame 140. Finally, the mobile battery replacement system 500 is moved away from the mobile device 100, thereby disengaging the platform 510 from the battery pack 150 and leaving the battery pack 150 in the frame 140 of the mobile device 100.

[0041] Industrial Applicability

[0042] In some industrial environments, battery-powered mobile devices 100 may be operated in remote locations, including off-highway locations. These mobile devices 100 spend considerable time traveling to recharging stations to recharge their battery packs 150. Electric mobile devices 100 are often operated under harsh and dynamic conditions and require continuous use throughout the day. Therefore, the disclosed embodiments provide battery packs 150 that can be quickly replaced with new or recharged battery packs 150 to maintain continuous operation of the electric mobile device 100 in the field.

[0043] The battery swap assembly may include a frame 140 configured to support a battery pack 150. The frame 140 includes a body 144, two arms 142 extending from the body, and a removable reinforcement 146 between rear ends of the two arms 142. In addition, the battery swap assembly may include a vertical movement system 300 or a horizontal movement system 500, whose elements include cylinder barrels, piston rods, and attachment points to enable rapid unloading and rapid loading of the battery pack 150 from and into the frame 140. Alternatively or in addition, a mobile battery swap system 500 may be provided that enables the battery pack 500 to be swapped in the field.

[0044] The ability to quickly replace the battery pack 150, possibly in the field, provides increased productivity. For example, the mobile device 100 no longer needs to leave the work area or interrupt the mission to find a recharging station. In addition, the mobile device 100 is only out of service for the time it takes to replace the battery pack 150, rather than the time it takes to recharge the battery pack 150 (which may be a considerable period of time).

[0045] The foregoing specific embodiments are merely exemplary and are not intended to limit the invention or the application and use of the invention. The described embodiments are not limited to use in conjunction with a particular type of machine. Therefore, although the present embodiment is depicted and described as being implemented in an electric mobile device for ease of illustration, it should be understood that it can be implemented in various other types of devices and machines with batteries and in various other systems and environments. In addition, there is no intention to be bound by any theory presented in any of the preceding sections. It should also be understood that the illustrations may include exaggerated sizes and graphical representations to better illustrate the reference items shown, and should not be considered so limited unless otherwise specified.

Claims

1. A battery replacement assembly comprising: A frame configured to support a battery pack, wherein the frame comprises: main body, two arms extending from the body, wherein each of the two arms includes a first end coupled to the body, and a second end, and A removable reinforcement member is provided between the second ends of the two arms.

2. The battery replacement assembly according to claim 1 further comprising a vertical movement system, The vertical movement system comprises two or more vertical movement elements. wherein each of the two or more vertically movable elements comprises a vertically oriented cylinder barrel, a piston rod configured to extend downwardly out of the cylinder barrel and retract upwardly into the cylinder barrel, and an attachment point at an end of the piston rod, and Each attachment point is configured to attach to the battery pack.

3. The battery replacement assembly according to claim 1 further comprising a horizontal movement system, wherein the horizontal movement system comprises two or more horizontal movement elements, wherein each of the two or more horizontal movement elements comprises a horizontally oriented cylinder barrel, a piston rod configured to extend out of the cylinder barrel in a first direction away from the body and to retract into the cylinder barrel in a second direction opposite to the first direction and toward the body, and an attachment point at an end of the piston rod, and Each attachment point is configured to attach to the battery pack.

4. The battery replacement assembly of claim 3, wherein the first direction and the second direction are horizontal.

5. The battery replacement assembly of claim 3, wherein the first direction and the second direction are at a non-zero angle relative to a horizontal axis.

6. The battery replacement assembly of claim 1, wherein the frame with the reinforcement encapsulates the battery pack to prevent exposure to an external environment.

7. The battery replacement assembly of claim 1, wherein the reinforcement is configured to be separated from the frame by sliding out from between the second ends of the two arms.

8. The battery replacement assembly of claim 1, wherein the reinforcement is configured to rotate horizontally outward without completely separating from the frame.

9. The battery replacement assembly of claim 1, wherein the reinforcement is configured to rotate vertically outward without completely separating from the frame.

10. The battery swap assembly of claim 1, wherein the reinforcement is configured to be secured to the frame in a closed state via one or more fasteners.

11. A mobile device, comprising: The battery replacement assembly according to claim 1; a first traction motor coupled to a first of the two arms; a first ground engaging member driven by the first traction motor; a second traction motor coupled to a second of the two arms; as well as A second ground engaging member is driven by the second traction motor.

12. The mobile device of claim 11, wherein each of the first traction motor and the second traction motor has an active suspension.

13. The mobile device of claim 11, wherein each of the first traction motor and the second traction motor has a motor reduction.

14. The mobile device of claim 11, wherein the first ground engaging member and the second ground engaging member are aligned along a lateral axis through the two arms but are not attached to the same shaft.

15. The mobile device of claim 11, wherein the reinforcement is positioned and accessible at a rear end of the mobile device.

16. The battery swap assembly of claim 1 further comprising the battery pack, wherein the battery pack comprises a pallet structure configured to be lifted by a forklift.

17. A battery replacement assembly comprising: A frame configured to support a battery pack, wherein the frame comprises: main body, two arms extending from the body, wherein each of the two arms includes a first end coupled to the body, and a second end, and a removable reinforcement member between the second ends of the two arms; a movement system, wherein the movement system comprises two or more movement elements, wherein each of the two or more movement elements comprises a cylinder barrel, a piston rod configured to extend outwardly from the cylinder barrel and retract inwardly into the cylinder barrel, and an attachment point at an end of the piston rod, and wherein each attachment point is configured to attach to the battery pack; a first traction motor coupled to a first of the two arms; a first ground engaging member driven by the first traction motor; a second traction motor coupled to a second of the two arms; and A second ground engaging member is driven by the second traction motor.

18. The battery replacement assembly of claim 17, wherein the piston rod extends vertically outward from the cylinder barrel and retracts vertically inward into the cylinder barrel.

19. The battery replacement assembly of claim 17, wherein the piston rod extends horizontally outward from the cylinder barrel and retracts horizontally inward into the cylinder barrel.

20. A battery replacement system, comprising: A mobile device comprising a frame configured to support a battery pack, wherein the frame comprises: main body, two arms extending from the body, wherein each of the two arms includes a first end coupled to the body, and a second end, and a removable reinforcement member extending across a region between the second ends of the two arms; and A mobile battery replacement system includes a platform configured to move vertically and / or horizontally, wherein the platform is configured to engage the battery pack and transport the battery pack through the area between the second ends of the two arms when the removable reinforcement is removed.

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