Energy storage equipment and installation method

Abstract

The invention discloses energy storage equipment and an installation method, the energy storage equipment comprises a container and a battery rack and a battery pack which are arranged in the container, specifically, the container comprises a box body and a cover plate, an opening is formed in one side of the box body, and the cover plate covers the opening and is connected with the box body to define a containing space; the plurality of battery racks are detachably arranged in the accommodating space; and a plurality of battery packs are arranged in the height direction of each battery rack. Compared with the prior art, the energy storage equipment provided by the invention has the advantages that the battery packs do not need to be disassembled one by one, when the battery rack is taken out, the battery packs loaded on the battery rack are taken out together and assembled together when the battery rack is assembled, and the disassembly and assembly efficiency is obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage devices, and particularly relates to an energy storage device and an installation method thereof. Background Art

[0002] Based on the requirements of the integration and large-scale of energy storage devices, connecting multiple battery packs in series and parallel in a large box has become a common construction solution for energy storage devices. Currently, relatively large energy storage devices have exceeded the restrictions of road transportation rules, which has led to inconvenience in the transportation and maintenance of large energy storage devices. A common solution is to partially remove the battery packs in the energy storage device and transport the overweight battery packs and the box separately to avoid transportation restrictions. In the transportation of some extra-large energy storage containers, the removal ratio of battery packs can even account for more than 60% of the total number of battery packs. The disassembly and assembly of battery packs will generate relatively large time costs and labor costs. Summary of the Invention

[0003] An object of the present invention is to provide an energy storage device and an installation method thereof, aiming to reduce the additional costs caused by disassembling and assembling battery packs of large energy storage devices.

[0004] To achieve the above object, a solution provided by the present invention is: an energy storage device, which includes a container, a battery rack and battery packs arranged in the container. Specifically: the container includes a box body and a cover plate. One side of the box body is provided with an opening, and the cover plate seals the opening and is connected to the box body to enclose a containing space; a plurality of battery racks are detachably arranged in the containing space; a plurality of battery packs are arranged in the height direction of each battery rack.

[0005] In some embodiments of the present application, the battery rack includes a plurality of cross bars, a plurality of vertical bars and a plurality of longitudinal bars. Specifically: the vertical bars extend along the height direction of the battery rack; the cross bars support the battery packs, and a plurality of cross bars are respectively connected to a plurality of vertical bars, and the extending direction of the cross bars faces the opening; the longitudinal bars connect some of the vertical bars or cross bars, and the extending directions of the vertical bars, the cross bars and the longitudinal bars are perpendicular to each other.

[0006] In some embodiments of the present application, the battery rack further includes a first positioning member. A plurality of first positioning holes are opened on the vertical bars, and a second positioning hole is opened on the cross bar. The first positioning member passes through one of the plurality of first positioning holes and the second positioning hole to fix the cross bar and the vertical bar.

[0007] In some embodiments of the present application, the distance between adjacent first positioning holes on each vertical bar is L1, and the thickness of the battery pack is L2, and L1 / L2≤30%.

[0008] In some embodiments of the present application, the length of the battery pack in the extending direction of the cross bar is L3, and the width of the battery pack in the extending direction of the longitudinal bar is L4, and L3>L4.

[0009] In some embodiments of the present application, the battery rack further includes a second positioning member. A third positioning hole is formed at one end of the vertical rod close to the bottom of the box body. The second positioning member passes through the third positioning hole and is connected to the box body.

[0010] In some embodiments of the present application, the energy storage device further includes a busbar cabinet and a first electrical conductivity member. The busbar cabinet is arranged in the accommodating space. One end of the first electrical conductivity member is electrically connected to the busbar cabinet, and the other end of the first electrical conductivity member is electrically connected to the battery pack.

[0011] In some embodiments of the present application, the first electrical conductivity member includes a wire and a wiring plug connected to the wire. A wiring hole is formed in the battery pack. One end of the wire away from the wiring plug is electrically connected to the busbar cabinet. The wiring plugs are arranged in one-to-one correspondence with the battery racks and are inserted into the wiring holes.

[0012] In some embodiments of the present application, the energy storage device further includes a second electrical conductivity member. Adjacent battery packs on the same battery rack are connected by the second electrical conductivity member. The second electrical conductivity member is located on the side of the battery rack close to the opening.

[0013] In some embodiments of the present application, a plurality of battery racks are arranged side by side in the first direction. The length of the container in the first direction is L5, and the length of the battery rack in the first direction is L6. 4000mm ≤ L6 ≤ 8000mm, 500mm ≤ L5 ≤ 1500mm, and L6 / L5 < 20%.

[0014] To achieve the above object, another solution provided by the present invention is: a method for installing an energy storage device, the installation method including the following steps: providing the battery rack according to any one of the above; assembling the battery packs in groups on the battery rack; and assembling the whole formed by the battery rack and the battery packs in the accommodating space.

[0015] In some embodiments of the present application, the battery rack includes a rack body and a lifting hook. The lifting hook is connected to the top of the rack body. Assembling the battery packs in groups on the battery rack includes: assembling the battery packs on the rack body; assembling the whole formed by the battery rack and the battery packs in the accommodating space includes: providing a guide rail, inserting the guide rail into the accommodating space through the opening, hanging the lifting hook on the guide rail, and sliding the whole formed by the battery rack and the battery packs into the accommodating space, and then disassembling the guide rail so that the battery rack is placed at the bottom of the box body.

[0016] The beneficial effects of the present invention are as follows:

[0017] The energy storage device provided by the present invention includes a container, a plurality of battery racks, and a plurality of battery packs. The container includes a box body and a cover plate. An opening is provided on one side of the box body, and the cover plate seals the opening and is connected to the box body to enclose a containing space. The plurality of battery racks are detachably arranged in the containing space. A plurality of battery packs are arranged in the height direction of each battery rack. That is, multiple groups of battery racks are arranged in the box body, and each group of battery racks supports a plurality of battery packs. When the energy storage device needs to remove some battery packs to relieve the overweight condition of the energy storage device, one or several battery racks together with the battery packs on the battery racks can be directly taken out to achieve rapid weight reduction of the energy storage device.

[0018] Compared with the prior art, the energy storage device provided by the present invention does not need to disassemble the battery packs one by one. When the battery rack is taken out, the battery packs loaded on the battery rack are taken out together and also loaded together during assembly. The disassembly and assembly efficiency are both significantly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0020] Figure 1 is a schematic diagram of the overall structure of the energy storage device provided by the embodiment of the present invention;

[0021] Figure 2 is an assembly schematic diagram of the battery pack and the battery rack provided by the embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of the overall structure of the battery rack provided by the embodiment of the present invention;

[0023] Figure 4 is Figure 3 a partial enlarged view of area A in

[0024] Figure 5 is Figure 3 a partial enlarged view of area B in

[0025] Figure 6 is along Figure 1 a partial sectional schematic diagram taken along line C-C in

[0026] Explanation of the reference numerals in the drawings:

[0027] 10. Container; 11. Box body; 12. Cover plate; 13. Accommodating space; 20. Battery rack; 21. Vertical rod; 211. First positioning hole; 212. Third positioning hole; 22. Cross rod; 221. Second positioning hole; 23. Longitudinal rod; 24. Hook; 30. Battery pack; 31. Wiring hole; 41. First positioning member; 50. Busbar cabinet; 61. First electrical conductance member; 611. Wire; 612. Wiring plug; 62. Second electrical conductance member. Detailed implementation manners

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 to 3 as shown in Figure 1 which is a schematic diagram of the overall structure of the energy storage device provided by the embodiment of the present invention; Figure 2 which is an assembly schematic diagram of the battery pack 30 and the battery rack 20 provided by the embodiment of the present invention; Figure 3 which is a schematic diagram of the overall structure of the battery rack 20 provided by the embodiment of the present invention.

[0030] With the increasing demand of the existing technology for the energy storage capacity of the energy storage device, the volume, weight of the energy storage device, and the number of battery packs 30 or battery modules in a single energy storage device have also increased accordingly, which has restricted the transportation of large energy storage devices. And disassembling some battery packs 30 before each transportation to meet the transportation weight limit and reassembling them after arriving at the use site will bring additional labor costs and time costs to the transportation of the energy storage device.

[0031] To solve the above technical problems, the present invention discloses an energy storage device, which includes a container 10 and a battery rack 20 and a battery pack 30 arranged in the container 10. Specifically: The container 10 includes a box body 11 and a cover plate 12. One side of the box body 11 is provided with an opening, and the cover plate 12 covers the opening and is connected to the box body 11 to enclose an accommodating space 13; a plurality of battery racks 20 are detachably arranged in the accommodating space 13; a plurality of battery packs 30 are arranged in the height direction of each battery rack 20.

[0032] To more clearly illustrate the technical principle of this embodiment, the application scenario of this energy storage device is described here: when the energy storage device exceeds the transport weight limit, at least one battery rack 20 together with all the battery packs 30 loaded on the battery rack 20 are taken out, so that the remaining part of the energy storage device meets the weight limit for transportation; the whole of the removed battery rack 20 and battery packs 30 and the remaining part of the energy storage device are transported to their usage sites separately; the battery rack 20 together with the battery packs 30 loaded on the battery rack 20 are loaded into the box body 11, and the transportation of the energy storage device can be completed without exceeding the weight limit.

[0033] Compared with the prior art, the battery packs 30 and the battery rack 20 in this embodiment form a modular battery cluster. During disassembly and assembly, only the battery rack 20 needs to be moved to achieve quick disassembly and assembly, which is convenient and reduces costs. Moreover, when the battery packs 30 are disassembled and transported in the prior art, if isolation tools are not configured correspondingly, the friction and collision between adjacent battery packs 30 may affect the service life of the battery packs 30. In this embodiment, the battery packs 30 are fully loaded on the battery rack 20, and there is no risk of friction or collision between the battery packs 30, and the transportation process is also safer.

[0034] In some embodiments of the present application, the battery rack 20 includes a plurality of cross bars 22, a plurality of vertical bars 21 and a plurality of longitudinal bars 23. Specifically: the vertical bars 21 extend along the height direction of the battery rack 20; the cross bars 22 support the battery packs 30, and a plurality of cross bars 22 are respectively connected to a plurality of vertical bars 21, and the extending direction of the cross bars 22 faces the opening; the longitudinal bars 23 connect some of the vertical bars 21 or the cross bars 22, and the extending directions of the vertical bars 21, the cross bars 22 and the longitudinal bars 23 are perpendicular to each other.

[0035] In this embodiment, the extending direction of the cross bar 22 is horizontally towards the opening of the container 10, and the battery pack 30 is carried on the cross bar 22. This enables when a single battery pack 30 fails, only the cover plate 12 of the container 10 needs to be opened to expose the corresponding battery pack 30. After releasing the fixation of the battery pack 30, the battery pack 30 can be pulled out along the cross bar 22 for maintenance or replacement. Because the extending direction of the cross bar 22 is horizontally towards the opening of the container 10, the disassembly and assembly process of the battery pack 30 is relatively easy, and for the heavy battery pack 30, enough space is provided for the intervention of corresponding equipment after the cover plate 12 is opened.

[0036] Please refer to Figure 4 , Figure 4 which is Figure 3 a partial enlarged view of area A in

[0037] Further, the battery rack 20 further includes a first positioning member 41. A plurality of first positioning holes 211 are formed in the vertical rod 21, and a second positioning hole 221 is formed in the cross rod 22. The first positioning member 41 passes through one of the plurality of first positioning holes 211 and the second positioning hole 221 to fix the cross rod 22 and the vertical rod 21.

[0038] By passing the first positioning member 41 through the first positioning hole 211 and the second positioning hole 221, rapid assembly of the cross rod 22 and the vertical rod 21 can be achieved. In some application scenarios, this facilitates further disassembly of the battery rack 20.

[0039] It should be noted that the first positioning member 41 in this embodiment is preferably a bolt and nut. However, in actual applications, under the self-weight of the cross rod 22 and the load of the battery pack 30, the cross rod 22 has a tendency to move downward spontaneously. That is, as long as the first positioning member 41 is inserted into the first positioning hole 211 and the second positioning hole 221, the positioning effect can be achieved under the tendency of the second positioning hole 221 to move relative to the first positioning hole 211 and the extrusion of the hole wall.

[0040] Furthermore, the distance between adjacent first positioning holes 211 on each vertical rod 21 is L1, and the thickness of the battery pack 30 is L2, and L1 / L2 ≤ 30%.

[0041] L1 / L2 ≤ 30%, that is, there are multiple first positioning holes 211 corresponding to the thickness of each battery pack 30. After the battery rack 20 is assembled, there are still a large number of idle first positioning holes 211. This enables the selection of the first positioning holes 211 that cooperate with the second positioning hole 221 as needed in actual application processes to achieve the effect of adjusting the position of the cross rod 22. That is, the battery rack 20 in this embodiment can adapt to the assembly space requirements of different battery packs 30, or modify other electrical equipment in certain specific situations, making it more versatile.

[0042] Optionally, the length of the battery pack 30 in the extending direction of the cross rod 22 is L3, and the width of the battery pack 30 in the extending direction of the longitudinal rod 23 is L4, and L3 > L4.

[0043] L3 > L4, that is, the side of the battery pack 30 facing the opening is the short side of the battery pack 30. With the opening area unchanged, this can expose at least one side surface of more battery packs 30 at the opening position, making it more convenient to repair more battery packs 30.

[0044] Please refer to Figure 5 , Figure 5 is Figure 3 a partial enlarged view of area B in

[0045] Optionally, the battery rack 20 further includes a second positioning member. A third positioning hole 212 is formed at one end of the vertical rod 21 close to the bottom of the box body 11. The second positioning member passes through the third positioning hole 212 and is connected to the box body 11.

[0046] The setting of the second positioning member can make the battery rack 20 more stably fixed in the box body 11, especially can prevent the remaining uninstalled battery rack 20 from tipping over in the box body 11 during the transportation of the energy storage device.

[0047] Please refer to Figure 6 , Figure 6 is a partial sectional schematic view along the C-C line in Figure 1 .

[0048] In some embodiments of the present application, the energy storage device further includes a busbar cabinet 50 and a first electrical conductance member 61. The busbar cabinet 50 is disposed in the accommodation space 13. One end of the first electrical conductance member 61 is electrically connected to the busbar cabinet 50, and the other end of the first electrical conductance member 61 is electrically connected to the battery pack 30.

[0049] The setting of the busbar cabinet 50 can perform busbar output on the battery packs 30 of each battery rack 20, and can also make the charging process of each battery pack 30 more stable. While optimizing the output effect of the energy storage device, the service life of the energy storage device is extended.

[0050] Specifically, there may be multiple first electrical conductance members 61. Each first electrical conductance member 61 is set corresponding to the battery pack 30 one by one, or the battery packs 30 are electrically connected and configured inside each battery rack 20, and the first electrical conductance member 61 is set corresponding to the battery rack 20 one by one.

[0051] Further, the first electrical conductance member 61 includes a wire 611 and a wiring plug 612 connected to the wire 611. A wiring hole 31 is formed on the battery pack 30. One end of the wire 611 away from the wiring plug 612 is electrically connected to the busbar cabinet 50. The wiring plug 612 is set corresponding to the battery rack 20 one by one and is inserted into the wiring hole 31.

[0052] The plug connectors set corresponding to the battery racks 20 one by one facilitate the disassembly and assembly of the battery racks 20. When the battery rack 20 is installed in the accommodation space 13, inserting the wiring plug 612 into the wiring hole 31 can quickly realize the electrical connection between the busbar cabinet 50 and the battery pack 30.

[0053] In some embodiments of the present application, the energy storage device further includes a second electrical conductance member 62. The adjacent battery packs 30 on the same battery rack 20 are connected by the second electrical conductance member 62. The second electrical conductance member 62 is located on the side of the battery rack 20 close to the opening.

[0054] Adjacent battery packs 30 on the same battery rack 20 are connected by a second electrical conductance member 62 located on one side of the opening. When it is necessary to repair and disassemble a single battery pack 30, only the second electrical conductance member 62 connected to it needs to be pulled out to disconnect the electrical connection between the battery pack 30 and the energy storage device, and then it can be taken out. Similarly, during assembly, only the battery pack 30 needs to be slid along the cross bar 22 to a preset position, and then the second electrical conductance member 62 is connected to the battery pack 30 to complete the installation of the battery pack 30.

[0055] In some embodiments of the present application, multiple battery racks 20 are arranged side by side in the first direction. The length of the container 10 in the first direction is L5, and the length of the battery rack 20 in the first direction is L6, where 4000mm ≤ L6 ≤ 8000mm, 500mm ≤ L5 ≤ 1500mm, and L6 / L5 < 20%.

[0056] L6 / L5 < 20%, that is, the length of the container 10 is greater than five times the width of the battery rack 20. This can ensure that the box body 11 can accommodate multiple battery racks 20. The weight of a single battery rack 20 and the battery packs 30 it carries accounts for a relatively small proportion of the entire energy storage device. When disassembling each battery rack 20, the granularity of the change in the weight of the energy storage device is smaller, reducing the additional transportation cost required for transporting the disassembled parts.

[0057] To solve the above technical problems, the present invention also discloses an installation method for an energy storage device. The installation method includes the following steps: providing the battery rack 20 according to any one of the above; assembling the battery packs 30 in groups on the battery rack 20; and assembling the whole formed by the battery rack 20 and the battery packs 30 in the accommodation space 13.

[0058] Similar to the above embodiments, the installation method for the energy storage device provided in this embodiment loads the battery packs 30 in batches on the battery rack 20, and then installs the battery rack 20 and the battery packs 30 it carries together in the accommodation space 13. Since it is not necessary to assemble the battery packs 30 one by one in the accommodation space 13, the installation method for the energy storage device provided in this embodiment can simplify the installation steps. In addition, even without considering the convenience brought by subsequent overall disassembly of the battery rack 20, compared with the technical solution of directly loading the battery packs 30 into the container 10 in the prior art, in this embodiment, the operation space for loading the battery packs 30 on the battery rack 20 is larger and the loading efficiency is higher.

[0059] It should be noted that when assembling the whole formed by the battery rack 20 and the battery packs 30 in the accommodation space 13 mentioned in this embodiment, the accommodation space here can be a specific structure inside the box body 11 mentioned in any of the above embodiments, or other bearing structures for accommodating the battery rack 20 and the battery packs 30.

[0060] In some embodiments of the present application, the battery rack 20 includes a rack body and a hook 24, and the hook 24 is connected to the top of the rack body; assembling the battery packs 30 in groups on the battery rack 20 includes: assembling the battery packs 30 on the rack body; assembling the whole formed by the battery rack 20 and the battery packs 30 into the accommodation space 13 includes: providing a guide rail, inserting the guide rail into the accommodation space 13 through the opening, hanging the hook 24 on the guide rail, and sliding the whole formed by the battery rack 20 and the battery packs 30 into the accommodation space 13, and then removing the guide rail so that the battery rack 20 is placed at the bottom of the box body 11.

[0061] This embodiment provides a convenient and feasible installation method for the battery rack. By the cooperation of the hook 24 and the guide rail, the battery rack 20 is slid in, reducing the assembly difficulty of the battery rack 20 and improving the assembly efficiency.

[0062] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If this specific posture changes, the directional indication will also change accordingly.

[0063] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be a middle element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element through a middle element.

[0064] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0065] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the description of the present invention's specification and drawings under the design concept of the present invention, or directly / indirectly applied to other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An energy storage device, characterized in that: include: A container, comprising a box body and a cover plate, wherein one side of the box body is provided with an opening, and the cover plate covers the opening and is connected with the box body to enclose a containing space; A battery rack, wherein a plurality of battery racks are detachably disposed in the accommodating space; Battery packs, a plurality of battery packs are arranged in the height direction of each battery rack.

2. The energy storage device according to claim 1, characterized in that: The battery rack comprises: A plurality of vertical rods extending along the height direction of the battery rack; A plurality of cross bars, supporting the battery pack, the plurality of cross bars are respectively connected to the plurality of vertical bars, and the extension direction of the cross bars is toward the opening; A plurality of longitudinal rods connect part of the vertical rods or the horizontal rods, and the extension directions of the vertical rods, the horizontal rods and the longitudinal rods are perpendicular to each other.

3. The energy storage device according to claim 2, characterized in that: The battery rack also includes a first positioning member, a plurality of first positioning holes are formed on the vertical rod, a second positioning hole is formed on the horizontal rod, and the first positioning member passes through one of the plurality of first positioning holes and the second positioning hole to fix the horizontal rod and the vertical rod.

4. The energy storage device according to claim 3, characterized in that: The distance between adjacent first positioning holes on each vertical rod is L1, the thickness of the battery pack is L2, and L1 / L2≤30%.

5. The energy storage device according to claim 2, characterized in that: The length of the battery pack in the direction in which the horizontal bar extends is L3, and the width of the battery pack in the direction in which the vertical bar extends is L4, where L3>L4.

6. The energy storage device according to claim 2, characterized in that: The battery rack further includes a second positioning member, a third positioning hole is formed at one end of the vertical rod close to the bottom of the box body, and the second positioning member penetrates the third positioning hole and is connected to the box body.

7. The energy storage device according to any one of claims 1 to 6, characterized in that: The energy storage device further includes a combiner cabinet and a first electrical conductor, wherein the combiner cabinet is disposed in the accommodating space, one end of the first electrical conductor is electrically connected to the combiner cabinet, and the other end of the first electrical conductor is electrically connected to the battery pack.

8. The energy storage device according to claim 7, characterized in that: The first electrical conductor includes a wire and a wiring plug connected to the wire. A wiring hole is provided on the battery pack. One end of the wire away from the wiring plug is electrically connected to the junction box. The wiring plug is arranged one by one corresponding to the battery rack and inserted into the wiring hole.

9. The energy storage device according to any one of claims 1 to 6, characterized in that: The energy storage device also includes a second electrical conductor, and the adjacent battery packs on the same battery rack are connected through the second electrical conductor, and the second electrical conductor is located on a side of the battery rack close to the opening.

10. The energy storage device according to any one of claims 1 to 6, characterized in that: A plurality of battery racks are arranged side by side in a first direction, a length of the container in the first direction is L5, a length of the battery rack in the first direction is L6, 4000mm≤L6≤8000mm, 500mm≤L5≤1500mm, and L6 / L5<20%.

11. A method for installing an energy storage device, characterized in that: The following steps are involved: Provide a battery rack according to any one of claims 1 to 10; Assembling the battery packs in groups on the battery rack; The battery rack and the battery pack are assembled as a whole in the accommodating space.

12. The energy storage device installation method according to claim 11, characterized in that: The battery rack includes a frame body and a hook, and the hook is connected to the top of the frame body; Assembling the battery packs in groups on the battery rack includes: assembling the battery packs on the rack; Assembling the battery rack and the battery pack as a whole in the accommodating space includes: providing a guide rail, inserting the guide rail into the accommodating space through the opening, hanging the hook on the guide rail, and sliding the battery rack and the battery pack as a whole into the accommodating space, and removing the guide rail so that the battery rack is placed at the bottom of the box.

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