Battery pack

Abstract

The invention relates to the technical field of batteries, and particularly discloses a battery pack which comprises a box body, a direct current converter and a battery management module, the box body is provided with a first cross beam and a first longitudinal beam, the direct current converter comprises a converter body and an installation assembly, the installation assembly comprises a first installation foot, a second installation foot and a third installation foot, the first installation foot is connected with the first cross beam, and the second installation foot is connected with the first longitudinal beam; the battery management module is arranged on the side, away from the first cross beam, of the direct-current converter, and the battery management module is connected with the third installation pin. By arranging the first mounting pin, the second mounting pin and the third mounting pin on the converter body, the assembly of the box body, the direct current converter and the battery management module can be realized without using an additional bracket for connection, so that the occupation of the bracket on the internal space of the battery pack can be reduced, the mounting difficulty can be reduced, and the mounting efficiency can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] As the requirements for electric vehicle batteries continue to increase, the usable space inside the battery pack is becoming increasingly limited. The gaps between adjacent modules are also getting smaller, and their connection methods are becoming more complex. For example, in the current technology, the BMS (Battery Management System) and DCDC (DC-DC Converter) need to be fixedly connected by an additional bracket, which is then connected to the housing. However, in order to accommodate the connection of the BMS, DC-DC, bracket, and housing, clearance holes are often required on the bracket, which complicates the bracket structure and increases the difficulty of installation. Summary of the Invention

[0003] The technical problem this application aims to solve is: how to address the complex and difficult assembly issues present in existing technologies.

[0004] To address the aforementioned technical problems, this application proposes a battery pack having three perpendicular directions: a first direction, a second direction, and a third direction, comprising: The housing has a first crossbeam and a first longitudinal beam spaced apart along the second direction; A DC-DC converter includes a converter body and a mounting assembly. The converter body is located on one side of a first crossbeam along a third direction. The mounting assembly is provided on at least one side of the converter body along the first direction. The mounting assembly includes a first mounting foot, a second mounting foot, and a third mounting foot. The first mounting foot and the second mounting foot are spaced apart along a second direction. The first mounting foot is connected to the first crossbeam, and the second mounting foot is connected to the first longitudinal beam. Along the third direction, the third mounting foot is located on the side of the converter body away from the first crossbeam. A battery management module is disposed along the third direction on the side of the DC converter away from the first crossbeam, and the battery management module is connected to the third mounting foot.

[0005] More preferably, along the third direction, the first mounting foot, the second mounting foot, and the third mounting foot are spaced apart by their orthogonal projections on the housing.

[0006] More preferably, the converter body has a first end face on one side along the first direction, and both the first mounting foot and the second mounting foot are connected to the first end face; The mounting assembly further includes a first reinforcing part, which connects the first mounting foot and the first end face; And / or, The first reinforcing part connects the second mounting foot and the first end face.

[0007] More preferably, along the third direction, the converter body has a first bottom surface on the side near the first crossbeam; The mounting assembly further includes a second reinforcing part, which connects the first mounting foot and the first bottom surface; And / or, The second reinforcing part connects the second mounting foot and the first bottom surface.

[0008] More preferably, along the second direction, the first crossbeam and the first longitudinal beam are spaced apart to form a first clearance slot, and along the third direction, the orthographic projection of the first bottom surface on the box body is at least partially located within the first clearance slot; And / or, the first bottom surface has a hollowed-out groove.

[0009] More preferably, the battery management module has a fourth mounting pin on at least one side along the first direction, and along the third direction, the orthogonal projection of the fourth mounting pin on the DC-DC converter at least partially overlaps with the third mounting pin, and the fourth mounting pin is connected to the third mounting pin.

[0010] More preferably, along the third direction, the third mounting foot is provided with a first connecting hole on the side facing the fourth mounting foot, the fourth mounting foot is provided with a second connecting hole, and along the third direction, the first connecting hole and the second connecting hole are arranged opposite to each other; The battery pack also includes a first fastener, which passes through the first connection hole and the second connection hole along the third direction to connect the third mounting foot and the fourth mounting foot.

[0011] More preferably, along the third direction, a connecting post is provided on the side of the third mounting foot facing the fourth mounting foot, the fourth mounting foot is provided with a second connecting hole, and the connecting post passes through the second connecting hole along the third direction.

[0012] More preferably, along the third direction, the first crossbeam has a first connection point on the side near the DC converter, and the first mounting foot is connected to the first connection point; Along the third direction, the first crossbeam has a second clearance slot on the side near the DC converter, and the first connection point is located on at least one side of the second clearance slot along the first direction.

[0013] More preferably, the box body further includes a second crossbeam and a second longitudinal beam; Along the second direction, the second crossbeam is spaced apart from the first crossbeam, and one end of the first longitudinal beam and the second longitudinal beam along the second direction is connected to the second crossbeam; Along the first direction, the second longitudinal beam is spaced apart from the first longitudinal beam, and one end of the first crossbeam along the first direction is connected to the second longitudinal beam.

[0014] The advantages of the battery pack proposed in this application compared with the prior art are as follows: This application provides a first mounting foot, a second mounting foot, and a third mounting foot on the converter body. The first mounting foot is connected to a first crossbeam, the second mounting foot is connected to a first longitudinal beam, and the battery management module is connected to the third mounting foot. This enables the assembly of the housing, DC-DC converter, and battery management module without the need for additional brackets. On the one hand, this reduces the space occupied by brackets within the battery pack, improving the utilization rate of the internal space. On the other hand, the mounting foot assembly simplifies the installation method between the housing, DC-DC converter, and battery management module, reducing installation difficulty and improving installation efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the battery pack described in this application.

[0016] Figure 2 This is a front view of the battery pack described in this application.

[0017] Figure 3 This is an exploded view of the battery pack described in Embodiment 1 of this application.

[0018] Figure 4 This is a structural schematic diagram of the box described in this application.

[0019] Figure 5 This is an assembly drawing of the housing, DC-DC converter, and battery management module described in this application.

[0020] Figure 6 This is a schematic diagram of the structure of the DC-DC converter described in this application.

[0021] Figure 7 This application Figure 6 Enlarged diagram of point A in the middle.

[0022] Figure 8 This is a top view of the DC-DC converter described in this application.

[0023] Figure 9 This is a schematic diagram of the DC-DC converter described in this application from another perspective.

[0024] Figure 10 This is a partial cross-sectional view of the battery pack described in this application.

[0025] Figure 11 This is a schematic diagram of the battery management module described in this application.

[0026] Figure 12 This is an exploded view of the battery pack described in Embodiment 2 of this application.

[0027] Figure label: 10. Box body; 11. First crossbeam; 111. First connection point; 112. Second clearance slot; 12. First longitudinal beam; 13. Second crossbeam; 14. Second longitudinal beam; 15. First clearance slot; 20. DC-DC converter; 21. Converter body; 211. First end face; 212. First bottom face; 2121. Hollowed-out groove; 22. Mounting assembly; 221. First mounting foot; 222. Second mounting foot; 223. Third mounting foot; 2231. First connecting hole; 2232. Connecting post; 224. First reinforcing part; 225. Second reinforcing part; 30. Battery management module; 31. Fourth mounting pin; 311. Second connection hole; 40. First fastener; X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0028] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0029] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" used to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0030] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] Furthermore, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0033] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0034] like Figure 1 As shown, this embodiment proposes a battery pack having a first direction X, a second direction Y, and a third direction Z that are perpendicular to each other.

[0035] In some implementation methods, please refer to Figure 1 and Figure 2 The battery pack includes a housing 10, a DC-DC converter 20, and a battery management module 30; wherein, along the third direction Z, the DC-DC converter 20 is connected to the housing 10, and the battery management module 30 is connected to the DC-DC converter 20.

[0036] In some implementation methods, please refer to Figures 3-5 The housing 10 has a first crossbeam 11 and a first longitudinal beam 12. Along the second direction Y, the first crossbeam 11 and the first longitudinal beam 12 are spaced apart, so that a first clearance slot 15 is formed between the first crossbeam 11 and the first longitudinal beam 12. In this way, the busbar inside the battery pack can be installed through the first clearance slot 15, avoiding the busbar from interfering with the first crossbeam 11 and the first longitudinal beam 12, thereby improving the space utilization of the housing 10.

[0037] Furthermore, for easier connection between the DC converter 20 and the housing 10, please refer to... Figures 3-5 The DC-DC converter 20 includes a converter body 21 and a mounting assembly 22. The mounting assembly 22 is provided on at least one side of the converter body 21 along a first direction X. The mounting assembly 22 includes a first mounting foot 221 and a second mounting foot 222, which are spaced apart along a second direction Y. The first mounting foot 221 is connected to a first crossbeam 11, and the second mounting foot 222 is connected to a first longitudinal beam 12. By providing the first mounting foot 221 and the second mounting foot 222, the DC-DC converter 20 can be quickly assembled with the housing 10 without the need for additional brackets, reducing assembly difficulty and improving assembly efficiency. Furthermore, to facilitate... The DC-DC converter 20 is connected to the battery management module 30. For this purpose, the mounting assembly 22 also includes a third mounting pin 223. Along the third direction Z, the third mounting pin 223 is located on the side of the converter body 21 away from the first crossbeam 11. The battery management module 30 is located on the side of the DC-DC converter 20 away from the first crossbeam 11 along the third direction Y, and the battery management module 30 is connected to the third mounting pin 223. The setting of the third mounting pin 223 enables the DC-DC converter 20 and the battery management module 30 to be quickly assembled, improving assembly efficiency. Moreover, using the mounting pin instead of the existing bracket can reduce the bracket's occupation of the internal space of the battery pack and improve the utilization rate of the internal space of the battery pack.

[0038] It should be noted that, along the third direction Z, the first mounting foot 221 and the second mounting foot 222 are both located on the side of the DC converter 20 near the first crossbeam 11, and the third mounting foot 223 is spaced apart from the first mounting foot 221 and the second mounting foot 222 on the third direction Z, so as to avoid any interference between the DC converter 20 and the housing 10, and between the DC converter 20 and the battery management module 30 during assembly.

[0039] In some embodiments, to further improve the assembly efficiency between the housing 10, the DC-DC converter 20, and the battery management module 30, for the following reasons, Figure 8 As shown, along the third direction Z, the orthographic projections of the first mounting foot 221, the second mounting foot 222, and the third mounting foot 223 are spaced apart, thereby creating a misalignment between the first mounting foot 221 and the third mounting foot 223, and between the second mounting foot 222 and the third mounting foot 223, to avoid interference between the mounting tool and the mounting feet and improve assembly efficiency.

[0040] In some implementations, such as Figure 6 and Figure 7As shown, the converter body 21 has a first end face 211 on one side along the first direction X, and the first mounting foot 221 and the second mounting foot 222 are both connected to the first end face 211. In order to enhance the connection strength between the first mounting foot 221 and the first end face 211, and to enhance the connection strength between the second mounting foot 222 and the first end face 211, the mounting assembly 22 further includes a first reinforcing part 224. There are multiple first reinforcing parts 224. At least a portion of the first reinforcing parts 224 connects the first mounting foot 221 and the first end face 211, and at least a portion of the first reinforcing parts 224 connects the second mounting foot 222 and the first end face 211, thereby enhancing the connection strength between the first mounting foot 221 and the second mounting foot 222 and the converter body 21, and preventing breakage when subjected to vibration.

[0041] In some embodiments, along the third direction Z, the converter body 21 has a first bottom surface 212 on the side near the first crossbeam 11; to further enhance the connection strength between the first mounting foot 221 and the first end surface 211, and to enhance the connection strength between the second mounting foot 222 and the first end surface 211, such as Figure 9 As shown, the mounting assembly 22 also includes a second reinforcing part 225, which is a plurality of second reinforcing parts 225. At least a portion of the second reinforcing parts 225 connects the first mounting foot 221 and the first bottom surface 212; at least a portion of the second reinforcing parts 225 connects the second mounting foot 222 and the first bottom surface 212. Thus, the first mounting foot 221 and the second mounting foot 222 are both connected to the converter body 21 through the first reinforcing part 224 and the second reinforcing part 225, so as to further improve the structural strength of the first mounting foot 221 and the second mounting foot 222, so as to ensure the connection strength between the DC converter 20 and the housing 10.

[0042] In some implementations, such as Figure 10 As shown, the first crossbeam 11 and the first longitudinal beam 12 form a first clearance slot 15 at intervals. Along the third direction Z, the orthographic projection of the first bottom surface 212 on the housing 10 is at least partially located within the first clearance slot 15. This provides installation space for the DC converter 20, making the connection between the DC converter 20 and the housing 10 more compact, thereby reducing the internal space occupation and improving space utilization. Furthermore, the setting of the first clearance slot 15 can provide heat dissipation space for the DC converter 20, extending the service life of the DC converter 20.

[0043] In some implementations, such as Figure 9 As shown, in order to further improve the heat dissipation effect of DC converter 20, the first bottom surface 212 has a hollow groove 2121. The hollow groove 2121 can increase the heat dissipation area of ​​DC converter 20, thereby improving the heat dissipation effect.

[0044] In some implementations, such as Figure 3As shown, in order to facilitate the connection between the battery management module 30 and the DC-DC converter 20, the battery management module 30 is provided with a fourth mounting pin 31 on at least one side along the first direction X, and along the third direction Z, the orthogonal projection of the fourth mounting pin 31 on the DC-DC converter 20 at least partially overlaps with the third mounting pin 223, and the fourth mounting pin 31 is connected to the third mounting pin 223.

[0045] Specifically, please refer to Figure 5 Along the third direction Z, a first connecting hole 2231 is provided on the side of the third mounting foot 223 facing the fourth mounting foot 31; please refer to Figure 11 The fourth mounting foot 31 is provided with a second connecting hole 311, and along the third direction Z, the first connecting hole 2231 is disposed opposite to the second connecting hole 311; the battery pack also includes a first fastener 40, along the third direction Z, the first fastener 40 passes through the first connecting hole 2231 and the second connecting hole 311, so that the first fastener 40 can connect the third mounting foot 223 and the fourth mounting foot 31, thereby reducing the assembly difficulty; preferably, the first fastener 40 is a screw.

[0046] In other implementation methods, please refer to Figure 12 Along the third direction Z, a connecting post 2232 is provided on the side of the third mounting foot 223 facing the fourth mounting foot 31. The fourth mounting foot 31 is provided with a second connecting hole 311. The connecting post 2232 passes through the second connecting hole 311 along the third direction Z. The connecting post 2232 is preferably a stud, which can realize the rapid positioning of the battery management module 30. The first fastener 40 is preferably a nut. The cooperation between the nut and the stud can realize rapid assembly and improve installation efficiency.

[0047] In some implementations, such as Figure 4 As shown, in order to facilitate the connection of the first mounting foot 221, a first connection point 111 is provided on the side of the first crossbeam 11 near the DC converter 20 along the third direction Z, and the first mounting foot 221 is connected to the first connection point 111; preferably, the first mounting foot 221 and the first connection point 111 are connected by bolts.

[0048] In addition, to avoid interference between the DC converter 20 and the first crossbeam 11, a second clearance slot 112 is provided on the side of the first crossbeam 11 near the DC converter 20 along the third direction Z. The first connection point 111 is located on at least one side of the second clearance slot 112 along the first direction X. The purpose of this design is to ensure that at least part of the DC converter 20 in the third direction Z is located in the second clearance slot 112, thereby avoiding interference, reducing space occupation, and improving space utilization.

[0049] In some implementations, such as Figure 4 and Figure 5As shown, to ensure the support strength of the first crossbeam 11 and the first longitudinal beam 12 for the DC converter 20, the housing 10 also includes a second crossbeam 13 and a second longitudinal beam 14. Along the second direction Y, the second crossbeam 13 is spaced apart from the first crossbeam 11, and one end of the first longitudinal beam 12 and the second longitudinal beam 14 along the second direction Y is connected to the second crossbeam 13. Along the first direction X, the second longitudinal beam 14 is spaced apart from the first longitudinal beam 12, and one end of the first crossbeam 11 along the first direction X is connected to the second longitudinal beam 14. Thus, the first crossbeam 11, the second crossbeam 13, and the second longitudinal beam 14 together form a frame structure, thereby ensuring the support strength of the first crossbeam 11. The first longitudinal beam 12 is connected to the second crossbeam 13, which can cooperate with the first crossbeam 11 to support the DC converter 20, thereby improving the overall support strength of the housing 10.

[0050] During installation, along the third direction Z, first connect the first mounting pin 221 on the DC converter 20 to the first crossbeam 11, then connect the second mounting pin 222 to the first longitudinal beam 12 and tighten them with fasteners (such as bolts), and then connect the fourth mounting pin 31 of the battery management module 30 to the third mounting pin 223 of the DC converter 20.

[0051] In summary, the battery pack proposed in this application, by providing a first mounting foot 221, a second mounting foot 222, and a third mounting foot 223 on the converter body 21, with the first mounting foot 221 connected to the first crossbeam 11, the second mounting foot 222 connected to the first longitudinal beam 12, and the battery management module 30 connected to the third mounting foot 223, enables the assembly of the housing 10, the DC-DC converter 20, and the battery management module 30 without the need for additional brackets. This reduces the space occupied by brackets within the battery pack, improving the utilization rate of the internal space. Furthermore, the use of mounting feet simplifies the installation method between the housing 10, the DC-DC converter 20, and the battery management module 30, reducing installation difficulty and improving installation efficiency.

[0052] The above description is merely a preferred embodiment of this application. It should be noted that, for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application. The basic principles, main features, and advantages of this application have been shown and described above. For those skilled in the art, it is obvious that this application is not limited to the details of the above preferred embodiments. The embodiments should be considered exemplary and non-limiting. The scope of this application is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included within this application.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in the embodiments can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A battery pack having a first direction (X), a second direction (Y), and a third direction (Z) that are perpendicular to each other, characterized in that, include: The box body (10) has a first crossbeam (11) and a first longitudinal beam (12) spaced apart along the second direction (Y); A DC-DC converter (20) includes a converter body (21) and a mounting assembly (22). The converter body (21) is located on one side of the first crossbeam (11) along the third direction (Z). The mounting assembly (22) is provided on at least one side of the converter body (21) along the first direction (X). The mounting assembly (22) includes a first mounting foot (221), a second mounting foot (222), and a third mounting foot (223). The first mounting foot (221) and the second mounting foot (222) are spaced apart along the second direction (Y). The first mounting foot (221) is connected to the first crossbeam (11), and the second mounting foot (222) is connected to the first longitudinal beam (12). Along the third direction (Z), the third mounting foot (223) is located on the side of the converter body (21) away from the first crossbeam (11). The battery management module (30) is located on the side of the DC-DC converter (20) away from the first crossbeam (11) along the third direction (Y), and the battery management module (30) is connected to the third mounting foot (223).

2. The battery pack according to claim 1, characterized in that, Along the third direction (Z), the first mounting foot (221), the second mounting foot (222), and the third mounting foot (223) are spaced apart by their orthogonal projections on the housing (10).

3. The battery pack according to claim 1, characterized in that, The converter body (21) has a first end face (211) on one side along the first direction (X), and the first mounting foot (221) and the second mounting foot (222) are both connected to the first end face (211). The mounting assembly (22) further includes a first reinforcing part (224), which connects the first mounting foot (221) and the first end face (211). And / or, The first reinforcing part (224) connects the second mounting foot (222) and the first end face (211).

4. The battery pack according to claim 1, characterized in that, Along the third direction (Z), the converter body (21) has a first bottom surface (212) on the side near the first crossbeam (11). The mounting assembly (22) further includes a second reinforcing part (225), which connects the first mounting foot (221) and the first bottom surface (212). And / or, The second reinforcing part (225) connects the second mounting foot (222) and the first bottom surface (212).

5. The battery pack according to claim 4, characterized in that, Along the second direction (Y), the first crossbeam (11) and the first longitudinal beam (12) form a first clearance slot (15) at intervals. Along the third direction (Z), the orthographic projection of the first bottom surface (212) on the box body (10) is at least partially located within the first clearance slot (15). And / or, the first bottom surface (212) has a cutout groove (2121).

6. The battery pack according to any one of claims 1-5, characterized in that, The battery management module (30) has a fourth mounting pin (31) on at least one side along the first direction (X), and along the third direction (Z), the orthographic projection of the fourth mounting pin (31) on the DC converter (20) at least partially overlaps with the third mounting pin (223), and the fourth mounting pin (31) is connected to the third mounting pin (223).

7. The battery pack according to claim 6, characterized in that, Along the third direction (Z), the third mounting foot (223) is provided with a first connecting hole (2231) on the side facing the fourth mounting foot (31), and the fourth mounting foot (31) is provided with a second connecting hole (311). Along the third direction (Z), the first connecting hole (2231) and the second connecting hole (311) are arranged opposite to each other. The battery pack also includes a first fastener (40) along the third direction (Z), the first fastener (40) passing through the first connection hole (2231) and the second connection hole (311) to connect the third mounting foot (223) and the fourth mounting foot (31).

8. The battery pack according to claim 6, characterized in that, Along the third direction (Z), the third mounting foot (223) is provided with a connecting post (2232) on the side facing the fourth mounting foot (31), and the fourth mounting foot (31) is provided with a second connecting hole (311). The connecting post (2232) passes through the second connecting hole (311) along the third direction (Z).

9. The battery pack according to any one of claims 1-5, characterized in that, Along the third direction (Z), the first crossbeam (11) is provided with a first connection point (111) on the side near the DC converter (20), and the first mounting foot (221) is connected to the first connection point (111); Along the third direction (Z), the first beam (11) is provided with a second clearance slot (112) on the side near the DC converter (20), and the first connection point (111) is located on at least one side of the second clearance slot (112) along the first direction (X).

10. The battery pack according to any one of claims 1-5, characterized in that, The box body (10) also includes a second crossbeam (13) and a second longitudinal beam (14); Along the second direction (Y), the second crossbeam (13) is spaced apart from the first crossbeam (11), and one end of the first longitudinal beam (12) and the second longitudinal beam (14) along the second direction (Y) is connected to the second crossbeam (13); Along the first direction (X), the second longitudinal beam (14) is spaced apart from the first longitudinal beam (12), and one end of the first crossbeam (11) along the first direction (X) is connected to the second longitudinal beam (14).

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