A multi-layered reinforcement composite battery pack tray structure

Abstract

The application discloses a kind of multilayer reinforcing rib composite battery pack tray structure, it is related to new energy automobile accessory technical field, including tray frame, top layer reinforcing structure, middle layer reinforcing structure and bottom layer reinforcing structure from top to bottom arrangement in tray frame inner side, top layer reinforcing structure top end is fixed with first cover plate, and multiple arrangement distribution is embedded in the inner side of the placing frame on first cover plate.The application is combined by top layer reinforcing structure, middle layer reinforcing structure and bottom layer reinforcing structure, adopts the design of multilayer reinforcing structure, optimizes overall stress distribution, significantly enhances the anti-deformation ability of tray under complex working conditions.Each layer reinforcing structure is effectively responded to stress action in different directions by the reasonable layout of multilayer reinforcing rib, can comprehensively improve the structural strength and stability of battery pack tray, ensure that battery pack maintains good performance and reliability in long-term use.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle parts technology, and in particular to a multi-layer reinforced composite battery pack tray structure. Background Technology

[0002] The battery pack tray is a core structural component for the load-bearing and protection of the power battery pack in new energy vehicles. Typically located at the bottom of the battery pack, it forms the "chassis skeleton" of the entire battery system. It is generally made of aluminum alloy, steel, or composite materials and is sealed together with the upper shell to form a closed cavity housing core components such as battery cells, modules, BMS, cooling or heating pipes, and high-voltage wiring harnesses. The battery pack tray can withstand impacts from road stones, bottoming out, scrapes, and water wading, preventing hard objects at the bottom from puncturing the tray and damaging the battery cells. Simultaneously, the cooperation between the tray, the upper shell, and the sealing ring achieves IP67 / IP68 waterproof and dustproof ratings, isolating rainwater, dust, mud, and corrosive gases, and preventing internal electrical short circuits and cell aging due to moisture.

[0003] Existing battery pack tray structures often suffer from insufficient structural strength, making them prone to deformation under complex operating conditions and affecting the overall performance and safety of the battery pack. Furthermore, the reinforcement design of traditional trays is relatively simple, failing to effectively distribute stress from different directions, leading to localized stress concentrations and further exacerbating the risk of deformation. Summary of the Invention

[0004] To address the aforementioned issues, this application provides a multi-layered reinforced composite battery pack tray structure.

[0005] To achieve the above objectives, this application provides the following technical solution: a multi-layer reinforced composite battery pack tray structure, including a tray frame, a top layer reinforcement structure, a middle layer reinforcement structure, and a bottom layer reinforcement structure arranged from top to bottom on the inner side of the tray frame. The top layer reinforcement structure is fixed with a first cover plate, and multiple placement frames are embedded in the first cover plate. When all battery modules are installed in the placement frames, the top layer reinforcement structure abuts against the bottom of the battery modules.

[0006] The middle layer reinforcement structure and the bottom layer reinforcement structure are separated by a second cover plate. Multiple reinforcement structures are fixed in the relative space between the second cover plate and the first cover plate. The reinforcement structures run through the top layer reinforcement structure and the middle layer reinforcement structure. Each placement frame has reinforcement structures distributed directly opposite its four corners.

[0007] Furthermore, the top-level reinforcing structure includes a first frame reinforcing rib fixed to the inner side wall of the pallet frame, multiple sets of first load-bearing ribs and second load-bearing ribs fixed in an X-structure, and multiple connecting ribs. The multiple sets of first load-bearing ribs and second load-bearing ribs are all facing the inner side of the placement frame, and the multiple connecting ribs are all arranged at equal intervals along the width direction of the pallet frame, fixing the ends of the multiple rows of first load-bearing ribs and second load-bearing ribs together, and the ends of the multiple connecting ribs are all fixed to the inner side of the first frame reinforcing rib.

[0008] Furthermore, the cross-sections of the first and second load-bearing ribs are both isosceles triangular structures, and the bottom edges of the first and second load-bearing ribs abut against the bottom of the first cover plate and the placement frame.

[0009] Furthermore, the middle layer reinforcement structure includes a second frame reinforcement rib fixed to the inner side wall of the pallet frame, multiple first partition ribs fixed to the inner side of the second frame reinforcement rib, multiple second partition ribs, and multiple sets of first area reinforcement ribs and second area reinforcement ribs fixed in a cross-shaped structure. The second frame reinforcement rib is fixed to the second cover plate. The multiple first partition ribs and second partition ribs are distributed at equal intervals along the length and width directions of the pallet frame, and the first partition ribs and second partition ribs are perpendicularly intersected and fixed to form multiple rectangular areas. The multiple rectangular areas correspond to the inner side of the placement frame, and the multiple sets of first area reinforcement ribs and second area reinforcement ribs are fixed inside the rectangular areas.

[0010] Furthermore, the reinforcement structure includes multiple reinforcing sleeves fixed in the space between the second cover plate and the first cover plate, and multiple sets of arc-shaped reinforcing ribs located inside the reinforcing sleeves. The multiple reinforcing sleeves are respectively embedded from bottom to top at multiple vertical intersections of the first partition rib and the second partition rib, as well as multiple fixed ends of the connecting rib and the first load-bearing rib and the second load-bearing rib.

[0011] Each set of arc-shaped reinforcing ribs is arranged at equal intervals along the circumference. Each arc-shaped reinforcing rib has an arched structure. The upper and lower ends of each set of arc-shaped reinforcing ribs are fixed to the first cover plate and the second cover plate respectively through the second positioning plate and the first positioning plate.

[0012] Furthermore, the inner side of the second positioning plate is threaded with a threaded pressure column, the head of the threaded pressure column is located above the first cover plate, a first pressure block is inserted into the inner cavity of the threaded pressure column, a second pressure block is inserted into the inner side of the second positioning plate, the first pressure block and the second pressure block are connected by a pressure spring, and each set of the first pressure block, the second pressure block and the pressure spring are located inside each set of arc-shaped reinforcing ribs.

[0013] Furthermore, the bottom reinforcement structure includes a third frame reinforcement rib fixed in the space between the bottom plate of the pallet frame and the second cover plate, multiple transverse ribs fixed inside the third frame reinforcement rib, and multiple longitudinal ribs. The transverse ribs and longitudinal ribs are distributed at equal intervals along the length and width of the pallet frame, and the transverse ribs and longitudinal ribs are fixed perpendicularly to each other, with a rounded transition at the intersection.

[0014] Furthermore, the cross-sections of the transverse and longitudinal ribs are trapezoidal, and the top of the transverse and longitudinal ribs abuts against the first and second region reinforcing ribs.

[0015] In summary, the technical effects and advantages of this invention are as follows:

[0016] This invention employs a multi-layered reinforcement structure, combining a top-layer, middle-layer, and bottom-layer reinforcing structure to optimize overall stress distribution and significantly enhance the tray's resistance to deformation under complex working conditions. Each layer of the reinforcement structure utilizes a rational layout of multiple reinforcing ribs to effectively cope with stresses from different directions, comprehensively improving the structural strength and stability of the battery pack tray and ensuring the battery pack maintains good performance and reliability during long-term use. Furthermore, the reinforced structure effectively enhances the bending and torsional resistance of each node in the middle and top-layer reinforcement structures of the battery pack tray, further dispersing the load in stress concentration areas and protecting the battery modules from external vibrations or impacts. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a schematic diagram of the disassembled pallet frame of the present invention.

[0020] Figure 3 This is a schematic diagram of the second-view structure of the pallet frame after disassembly.

[0021] Figure 4 This is a schematic diagram of the top-level reinforcement structure of the present invention.

[0022] Figure 5 This is a schematic diagram showing the relative positions of the first and second load-bearing ribs of the present invention.

[0023] Figure 6This is a schematic diagram of the middle layer reinforcement structure of the present invention.

[0024] Figure 7 This is a schematic diagram of the underlying reinforcement structure of the present invention.

[0025] Figure 8 This is a schematic diagram of the connection structure between the bottom reinforcing structure and the pallet frame of the present invention.

[0026] Figure 9 This is a schematic diagram of the top-layer reinforcing structure and the middle-layer reinforcing structure after cross-section.

[0027] Figure 10 For the present invention Figure 9 Enlarged structural diagram at point A in the middle.

[0028] Figure 11 This is a schematic diagram of the cross-section of the reinforcing sleeve and the arc-shaped reinforcing rib of the present invention.

[0029] Figure 12 This is a schematic diagram of the cross-section of the reinforcing sleeve, arc-shaped reinforcing rib, and threaded pressure column of the present invention.

[0030] In the diagram: 1. Pallet frame; 2. First frame reinforcement rib; 3. First cover plate; 4. Placement frame; 5. First load-bearing rib; 6. Second load-bearing rib; 7. Connecting rib; 8. Reinforcing sleeve; 9. Second frame reinforcement rib; 10. First partition rib; 11. Second partition rib; 12. First area reinforcement rib; 13. Second area reinforcement rib; 14. Second cover plate; 15. Third frame reinforcement rib; 16. Transverse rib; 17. Longitudinal rib; 18. First positioning plate; 19. Arc-shaped reinforcement rib; 20. Second positioning plate; 21. Threaded pressure column; 22. First pressure block; 23. Pressure spring; 24. Second pressure block. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Example: Reference Figure 1 - Figure 4 The multi-layer reinforced composite battery pack tray structure shown includes a tray frame 1, a top layer reinforcement structure, a middle layer reinforcement structure and a bottom layer reinforcement structure arranged from top to bottom inside the tray frame 1. A first cover plate 3 is fixed to the top of the top layer reinforcement structure. Multiple placement frames 4 are embedded in the first cover plate 3. When all battery modules are installed inside the placement frames 4, the top layer reinforcement structure abuts against the bottom of the battery modules.

[0033] Therefore, in the actual use of this battery pack tray, the placement frame 4 plays a role in positioning and limiting, fixing the position of the battery module, preventing the battery module from shifting or colliding during vehicle operation (such as during rapid acceleration, sudden braking, or turning), protecting the safety of the battery module, and facilitating the subsequent assembly and maintenance of battery accessories.

[0034] The bottom reinforcing structure, furthest from the battery module, primarily bears the overall weight of the power battery module, distributing the weight evenly to the tray frame and vehicle mounting points. This prevents the base plate from denting or deforming due to excessive localized stress, ensuring the load-bearing stability of the tray frame 1. The middle reinforcing structure is used to distribute stress in zones, further allocating the battery weight to various zones to avoid stress concentration in localized areas, while also providing stable support for the top reinforcing structure. The top reinforcing structure strengthens the first cover plate 3 and the placement frame 4, resisting the squeezing force during battery module installation, preventing deformation of the first cover plate 3, ensuring the flatness of the mounting surface, and guaranteeing precise installation of the battery module.

[0035] Furthermore, such as Figure 2 , Figure 3 As shown, the middle and bottom reinforcing structures are separated by the second cover plate 14, further enhancing the overall load-bearing capacity and ensuring the coordinated operation of each reinforcing structure. Multiple reinforcing structures are fixed within the space between the second cover plate 14 and the first cover plate 3, extending through the top and middle reinforcing structures. Each placement frame 4 has reinforcing structures positioned opposite its four corners. The reinforcement structures effectively enhance the bending and torsional resistance of each node in the middle and top reinforcing structures of the battery pack tray, further dispersing the load in stress concentration areas and protecting the battery module from external vibration or impact.

[0036] Therefore, this multi-layered reinforced composite battery pack tray structure optimizes the overall stress distribution through its multi-layered reinforcement design, significantly enhancing the tray's resistance to deformation under complex working conditions. The rational layout of the multi-layered reinforcing ribs effectively addresses stress in different directions, comprehensively improving the structural strength and stability of the battery pack tray and ensuring the battery pack maintains good performance and reliability during long-term use.

[0037] Specifically, such as Figure 4 , Figure 5As shown, the top-level reinforcing structure includes a first frame reinforcing rib 2 fixed to the inner wall of the pallet frame 1, multiple sets of first load-bearing ribs 5 and second load-bearing ribs 6 fixed in an X-shape, and multiple connecting ribs 7. The multiple sets of first load-bearing ribs 5 and second load-bearing ribs 6 are all facing the inner side of the placement frame 4, and the multiple connecting ribs 7 are all arranged at equal intervals along the width direction of the pallet frame 1, fixing the ends of the multiple rows of first load-bearing ribs 5 and second load-bearing ribs 6 together, and the ends of the multiple connecting ribs 7 are all fixed to the inner side of the first frame reinforcing rib 2.

[0038] The first frame reinforcing rib 2 can strengthen the strength of the tray frame 1 near the top layer and resist external pressure. The combination of the first load-bearing rib 5, the second load-bearing rib 6 and multiple connecting ribs 7 can effectively prevent the first cover plate 3 and multiple placement frames 4 from deforming and wearing under external impact, ensuring the flatness of the battery module mounting surface and providing a guarantee for the accurate installation of the battery module.

[0039] like Figure 5 As shown, the cross-sections of the first load-bearing rib 5 and the second load-bearing rib 6 are both isosceles triangular structures, and the bases of the first load-bearing rib 5 and the second load-bearing rib 6 abut against the bottom ends of the first cover plate 3 and the placement frame 4. The isosceles triangular structure allows the first load-bearing rib 5 and the second load-bearing rib 6 to evenly distribute the force to both sides when subjected to vertical pressure, thereby improving the overall compressive strength of the structure. At the same time, it effectively reduces the amount of material used in the first load-bearing rib 5 and the second load-bearing rib 6, achieving the goal of lightweighting while ensuring strength.

[0040] like Figure 6 As shown, the design of the middle layer reinforcement structure further refines the stress distribution path. Specifically, the middle layer reinforcement structure includes a second frame reinforcement rib 9 fixed to the inner wall of the pallet frame 1, multiple first partition ribs 10 and multiple second partition ribs 11 fixed to the inner side of the second frame reinforcement rib 9, and multiple sets of first area reinforcement ribs 12 and second area reinforcement ribs 13 fixed in a cross-shaped structure. The second frame reinforcement rib 9 is fixed to the second cover plate 14. The multiple first partition ribs 10 and second partition ribs 11 are distributed at equal intervals along the length and width directions of the pallet frame 1, and the first partition ribs 10 and second partition ribs 11 are perpendicularly intersected and fixed to form multiple rectangular areas. The multiple rectangular areas correspond to the inner side of the placement frame 4, and the multiple sets of first area reinforcement ribs 12 and second area reinforcement ribs 13 are fixed inside the rectangular areas.

[0041] The second frame reinforcing rib 9 connects to the first frame reinforcing rib 2, enhancing the impact resistance of the entire tray frame 1 side. The first partition rib 10 and multiple second partition ribs 11 decompose the middle layer reinforcing structure into multiple partitioned load-bearing structures corresponding to the battery modules. The setting of multiple rectangular areas provides additional support points for the battery modules within the placement frame 4. The first area reinforcing rib 12 and the second area reinforcing rib 13 within the rectangular areas are intersected and fixed in a cross-shaped structure, enhancing the rigidity of the local area and preventing deformation of the middle layer structure due to the weight of the battery modules.

[0042] Furthermore, such as Figure 5 , Figure 6 As shown, the cross-shaped structure formed by the first reinforcing rib 12 and the second reinforcing rib 13, combined with the X-shaped structure formed by the first load-bearing rib 5 and the second load-bearing rib 6, forms a multi-layered stress-dispersing structure, effectively coping with forces from different directions. This design not only improves the overall structural stability but also significantly reduces the possibility of deformation under complex working conditions, while providing an auxiliary channel for heat dissipation of the battery module.

[0043] like Figure 9 , Figure 10 As shown, the reinforcement structure includes multiple reinforcing sleeves 8 fixed within the space between the second cover plate 14 and the first cover plate 3, and multiple sets of arc-shaped reinforcing ribs 19 located inside the reinforcing sleeves 8. The multiple reinforcing sleeves 8 are respectively embedded from bottom to top at multiple vertical intersections of the first partition rib 10 and the second partition rib 11, as well as multiple fixed endpoints of the connecting rib 7 and the first load-bearing rib 5 and the second load-bearing rib 6. The arrangement of the reinforcing sleeves 8 allows for tight connection of key nodes in the top-layer and middle-layer reinforcement structures, reinforcing multiple nodes to form a unified support structure.

[0044] Each set of arc-shaped reinforcing ribs 19 is equidistantly arranged along a circular trajectory. Each arc-shaped reinforcing rib 19 has an arched structure. The upper and lower ends of each set of arc-shaped reinforcing ribs 19 are fixed to the first cover plate 3 and the second cover plate 14 respectively through the second positioning plate 20 and the first positioning plate 18. When the bottom of the entire pallet frame 1 is impacted, the arc-shaped reinforcing ribs 19 with arched structures can effectively disperse the pressure and improve the reinforcement effect of the reinforcing sleeve 8 on the top layer reinforcement structure and the nodes of the middle layer reinforcement structure.

[0045] like Figure 11 , Figure 12As shown, a threaded pressure post 21 is threadedly connected to the inner side of the second positioning disk 20. The head of the threaded pressure post 21 is located above the first cover plate 3. A first pressure block 22 is inserted into the inner cavity of the threaded pressure post 21. A second pressure block 24 is inserted into the inner side of the second positioning disk 20. The first pressure block 22 and the second pressure block 24 are connected by a pressure spring 23. In the natural state, each set of first pressure block 22, second pressure block 24 and pressure spring 23 is located inside each set of arc-shaped reinforcing ribs 19, making full use of the internal space. When the bottom of the entire tray frame 1 is impacted, the elastic connection between the first pressure block 22, the second pressure block 24 and the pressure spring 23 can effectively absorb external vibration or impact energy and protect the battery module from the effects of dynamic loads.

[0046] like Figure 12 As shown, the design of the threaded pressure column 21 further enhances the adjustability of the structure. In its natural state, it provides a positioning effect for the vertically distributed first pressure block 22, second pressure block 24, and pressure spring 23, allowing them to fully exert their buffering function. After disassembling the threaded pressure column 21, the first pressure block 22, second pressure block 24, and pressure spring 23 can be replaced, improving operational portability.

[0047] like Figure 7 , Figure 8 As shown, the bottom reinforcement structure includes a third frame reinforcement rib 15 fixed in the space between the bottom plate of the pallet frame 1 and the second cover plate 14, multiple transverse ribs 16 and multiple longitudinal ribs 17 fixed inside the third frame reinforcement rib 15. The transverse ribs 16 and longitudinal ribs 17 are distributed at equal intervals along the length and width directions of the pallet frame 1, and the transverse ribs 16 and longitudinal ribs 17 are fixed perpendicularly to each other, with a rounded transition at the intersection.

[0048] The third frame reinforcing rib 15 strengthens the connection between the pallet frame 1 base plate and the frame, preventing cracking at the connection point due to vibration and stress, while also preventing deformation of the base plate edge and ensuring the overall sealing of the pallet. The grid structure formed by multiple transverse ribs 16 and multiple longitudinal ribs 17 prevents the base plate of the pallet frame 1 from denting or deforming due to excessive local stress, ensuring the overall load-bearing stability of the pallet. It also withstands impacts from the bottom during driving (such as road bumps or stone impacts), dispersing impact stress and protecting the base plate from penetration or damage, thereby protecting the internal battery module.

[0049] like Figure 7 As shown, the cross-sections of the transverse ribs 16 and the longitudinal ribs 17 are both trapezoidal, and the top of both the transverse ribs 16 and the longitudinal ribs 17 abuts against the first region reinforcing rib 12 and the second region reinforcing rib 13. The trapezoidal cross-section structure enhances the load-bearing capacity of the multiple transverse ribs 16 and the multiple longitudinal ribs 17. The rounded transition between the transverse ribs 16 and the longitudinal ribs 17 not only alleviates stress concentration but also improves the fatigue resistance of the structure.

[0050] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-layer reinforced composite battery pack tray structure, characterized in that: It includes a tray frame (1), a top layer reinforcement structure, a middle layer reinforcement structure and a bottom layer reinforcement structure arranged from top to bottom inside the tray frame (1). The top layer reinforcement structure is fixed with a first cover plate (3). Multiple placement frames (4) are embedded on the first cover plate (3). When the battery modules are all installed inside the placement frames (4), the top layer reinforcement structure abuts against the bottom of the battery modules. The middle layer reinforcement structure and the bottom layer reinforcement structure are separated by the second cover plate (14). Multiple reinforcement structures are fixed in the relative space between the second cover plate (14) and the first cover plate (3). The reinforcement structures run through the top layer reinforcement structure and the middle layer reinforcement structure. Each placement frame (4) has reinforcement structures distributed directly opposite its four corners.

2. The multi-layer reinforced composite battery pack tray structure according to claim 1, characterized in that: The top-level reinforcing structure includes a first frame reinforcing rib (2) fixed to the inner wall of the pallet frame (1), multiple sets of first load-bearing ribs (5) and second load-bearing ribs (6) fixed in an X-shape, and multiple connecting ribs (7). The multiple sets of first load-bearing ribs (5) and second load-bearing ribs (6) are all facing the inner side of the placement frame (4), and the multiple connecting ribs (7) are all arranged at equal intervals along the width direction of the pallet frame (1), fixing the ends of multiple rows of first load-bearing ribs (5) and second load-bearing ribs (6) together, and the ends of multiple connecting ribs (7) are all fixed to the inner side of the first frame reinforcing rib (2).

3. The multi-layer reinforced composite battery pack tray structure according to claim 2, characterized in that: The cross-sections of the first load-bearing rib (5) and the second load-bearing rib (6) are both isosceles triangular structures, and the bottom edges of the first load-bearing rib (5) and the second load-bearing rib (6) abut against the bottom of the first cover plate (3) and the placement frame (4).

4. The multi-layer reinforced composite battery pack tray structure according to claim 2, characterized in that: The middle layer reinforcement structure includes a second frame reinforcement rib (9) fixed to the inner wall of the pallet frame (1), multiple first partition ribs (10) fixed to the inner side of the second frame reinforcement rib (9), multiple second partition ribs (11) and multiple sets of first area reinforcement ribs (12) and second area reinforcement ribs (13) fixed in a cross-shaped structure. The second frame reinforcement rib (9) is fixed to the second cover plate (14). The multiple first partition ribs (10) and second partition ribs (11) are distributed at equal intervals along the length and width of the pallet frame (1). After the first partition ribs (10) and second partition ribs (11) are perpendicularly crossed and fixed, multiple rectangular areas are formed. The multiple rectangular areas correspond to the inner side of the placement frame (4). The multiple sets of first area reinforcement ribs (12) and second area reinforcement ribs (13) are fixed inside the rectangular areas.

5. The multi-layer reinforced composite battery pack tray structure according to claim 4, characterized in that: The reinforcement structure includes multiple reinforcing sleeves (8) fixed in the space between the second cover plate (14) and the first cover plate (3) and multiple sets of arc-shaped reinforcing ribs (19) located inside the reinforcing sleeves (8). The multiple reinforcing sleeves (8) are respectively embedded in multiple vertical intersections of the first partition rib (10) and the second partition rib (11) from bottom to top, as well as multiple fixed ends of the connecting rib (7) and the first load-bearing rib (5) and the second load-bearing rib (6). Each set of arc-shaped reinforcing ribs (19) is arranged at equal intervals along the circumference. Each arc-shaped reinforcing rib (19) has an arched structure. The upper and lower ends of each set of arc-shaped reinforcing ribs (19) are fixed to the first cover plate (3) and the second cover plate (14) respectively through the second positioning plate (20) and the first positioning plate (18).

6. The multi-layer reinforced composite battery pack tray structure according to claim 5, characterized in that: The second positioning plate (20) is threaded with a threaded pressure column (21) on its inner side. The head of the threaded pressure column (21) is located above the first cover plate (3). A first pressure block (22) is inserted into the inner cavity of the threaded pressure column (21). A second pressure block (24) is inserted into the inner side of the second positioning plate (20). The first pressure block (22) and the second pressure block (24) are connected by a pressure spring (23). Each set of first pressure block (22), second pressure block (24) and pressure spring (23) is located inside each set of arc-shaped reinforcing ribs (19).

7. The multi-layer reinforced composite battery pack tray structure according to claim 4, characterized in that: The bottom reinforcement structure includes a third frame reinforcement rib (15) fixed in the space between the bottom plate of the pallet frame (1) and the second cover plate (14), multiple transverse ribs (16) fixed inside the third frame reinforcement rib (15), and multiple longitudinal ribs (17). The transverse ribs (16) and longitudinal ribs (17) are distributed at equal intervals along the length and width of the pallet frame (1), and the transverse ribs (16) and longitudinal ribs (17) are fixed perpendicularly to each other, with a rounded transition at the intersection.

8. The multi-layer reinforced composite battery pack tray structure according to claim 7, characterized in that: The cross-sections of the transverse ribs (16) and longitudinal ribs (17) are trapezoidal, and the top of the transverse ribs (16) and longitudinal ribs (17) abut against the first region reinforcing ribs (12) and the second region reinforcing ribs (13).

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