Tray device, support apparatus, battery pack, and workpiece processing method

Abstract

This application provides a pallet device, a support device, a battery pack, and a workpiece processing method. The pallet device includes: a roll-formed pallet body having two first edges opposite each other along a first direction, the first edges extending along a second direction perpendicular to the second direction, a portion of the first edge protruding along the first direction to form a plurality of lifting parts, the plurality of lifting parts being spaced apart along the second direction; the pallet body having a plurality of first regions spaced apart along the second direction, the lifting parts being located at least in the first regions, a second region being provided between two adjacent first regions, the first regions and the second regions being connected by a first transition zone, the thickness T1 of the first region and the thickness T2 of the second region satisfying: T1 > T2. The pallet device of this application achieves lightweight design while meeting structural strength requirements.

Description

Technical Field

[0001] This application relates to the field of battery pack installation equipment technology, and in particular to a tray device, a support device, a battery pack, and a workpiece processing method. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the power battery system, as its core component, faces increasingly stringent requirements regarding safety, energy density, and lightweighting. The battery pack tray, as a key structural component that supports and protects the battery cell modules, must not only possess sufficient strength and rigidity to withstand complex conditions such as mechanical shock, vibration, and thermal deformation, but also minimize its own weight while ensuring structural reliability, thereby improving the vehicle's energy efficiency and range.

[0003] Currently, the industry widely uses roll forming technology to manufacture steel battery pack trays, and the mainstream approach is based on thick steel plates (i.e., uniform thickness plates) as raw materials. While this approach has advantages such as mature technology, short mold development cycle, and high production efficiency, it has significant limitations in structural design: to meet the strength and stiffness requirements of local high-load areas, the entire tray must use uniformly thick plates, resulting in a large amount of redundant material accumulation in non-critical load-bearing areas.

[0004] Although some studies have attempted to optimize the pallet structure by using local reinforcement or introducing lightweight materials such as aluminum alloys, these methods often lead to problems such as complicated welding processes, reduced connection reliability, increased costs, or difficulties in recycling, making it difficult to balance performance, cost, and manufacturing efficiency in large-scale mass production. Summary of the Invention

[0005] This application provides a pallet device, a support device, a battery pack, and a workpiece processing method. By distinguishing and setting functional areas of different thicknesses on the pallet body, the pallet device achieves lightweight design while meeting structural strength requirements.

[0006] In a first aspect, embodiments of this application provide a pallet device, comprising: a roll-formed pallet body having two first edges opposite each other along a first direction, the first edges extending along a second direction, the first direction being perpendicular to the second direction, a portion of the structure of the first edges protruding along the first direction to form a plurality of lifting parts, the plurality of lifting parts being spaced apart along the second direction; the pallet body having a plurality of first regions spaced apart along the second direction, the lifting parts being at least located in the first regions, a second region being provided between two adjacent first regions, the first regions and the second regions being connected by a first transition region, the thickness T1 of the first region and the thickness T2 of the second region satisfying: T1 > T2.

[0007] The pallet device of this application maintains a large thickness in the high-load area corresponding to the first region, ensuring the strength and rigidity requirements under lifting, installation, and collision conditions, thereby improving the safety of the battery pack. The non-critical load-bearing area corresponding to the second region is thinned, reducing unnecessary material usage and thus reducing the weight of the pallet device, which in turn helps to improve the energy density of the battery pack and the overall vehicle range.

[0008] Meanwhile, the main body of the disc adopts a roll forming process to achieve a variable thickness structure, eliminating the need for welding, riveting, or composite material connections, thus avoiding the introduction of additional process complexity and failure risks, and improving production efficiency.

[0009] In addition, the variable thickness design of the tray body can adjust the natural frequency of the tray device and reduce the risk of resonance, while traditional thick plates require additional reinforcing ribs or welding reinforcement, which makes the production process complicated.

[0010] In some embodiments, the thickness T1 of the first region and the thickness T2 of the second region satisfy: 1 ​​< T1 / T2 ≤ 2.1; and / or, the thickness T1 of the first region satisfies: 1 mm ≤ T1 ≤ 1.6 mm; and / or, the thickness T2 of the second region satisfies: 0.6 mm ≤ T2 ≤ 1 mm.

[0011] In some embodiments, the hoisting part has a hoisting hole that extends through the thickness direction, and the distance M5 between the axes of two adjacent hoisting holes along the second direction and the length M2 of the second region along the second direction satisfy the following condition: 0.35≤M2 / M5≤0.65.

[0012] In some embodiments, the length M1 of the first region along the second direction satisfies: 134mm ≤ M1 ≤ 154mm; and / or, the length M2 of the second region along the second direction satisfies: 142mm ≤ M2 ≤ 175mm; and / or, the length M3 of the first transition region along the second direction satisfies: 36mm ≤ M3 ≤ 52mm; and / or, the disk body has two opposing second edges along the second direction, the second edges forming a first edge region with the adjacent first region, the thickness of the first edge region being equal to the thickness of the first region, and the length M4 of the first edge region along the second direction satisfies: 51mm ≤ M4 ≤ 196mm.

[0013] In some embodiments, the length M3 of the first transition zone along the second direction and the strength φ of the disk body satisfy: M3≥[(1.15*φ / 30)±3]*(T1-T2).

[0014] Secondly, this application provides a support device for supporting a battery pack. The support device includes: the aforementioned tray assembly, the tray body of which has a support surface and a backing surface opposite each other along the thickness direction; two first arm beams disposed on the support surface and spaced apart along a second direction, the two first arm beams defining an installation space for accommodating battery cell components; two second arm beams disposed on the backing surface, the second arm beams extending along the second direction and at least partially overlapping with the first edge, the second arm beams having a plurality of through mounting holes along the thickness direction, the mounting holes corresponding one-to-one with the lifting holes on the tray body; and a sleeve fixedly installed in the mounting holes, the sleeve passing through the lifting holes and fixedly connected to the tray body.

[0015] The supporting equipment of this application, by using the aforementioned pallet device, achieves lightweight design while maintaining sufficient structural strength, thus avoiding redundant material waste and saving production costs.

[0016] In some embodiments, the length D1 of the lifting part of the pallet device along the second direction and the outer diameter D2 of the sleeve member satisfy the following condition: D1 / D2≥2.

[0017] In some embodiments, the first arm beam is roll-formed, and the first arm beam has a third region and a fourth region arranged at intervals along the first direction, and the third region and the fourth region are connected by a second transition region; wherein the thickness T3 of the third region and the thickness T4 of the fourth region satisfy: T3 > T4.

[0018] According to some embodiments of the present invention, the thickness T3 of the third region and the thickness T4 of the fourth region satisfy: 1 ​​< T3 / T4 ≤ 2.1; and / or, the thickness T3 of the third region satisfies: 1 mm ≤ T3 ≤ 1.6 mm; and / or, the thickness T4 of the fourth region satisfies: 0.6 mm ≤ T4 ≤ 1 mm; and / or, the length M6 of the third region along the first direction satisfies: 500 mm ≤ M6 ≤ 525 mm; and / or, the length M7 of the fourth region along the first direction satisfies: 48 mm ≤ M7 ≤ 56 mm; and / or, the length M8 of the second transition region along the first direction satisfies: 36 mm ≤ M8 ≤ 52 mm.

[0019] In some embodiments, the second arm beam is roll-formed, and the second arm beam has a plurality of fifth regions spaced apart along the second direction. The first region corresponds one-to-one with the fifth region. The projection of the first region along the thickness direction is located within the projection of the fifth region along the thickness direction. A sixth region is provided between two adjacent fifth regions. The fifth region and the sixth region are connected by a third transition region. The thickness T5 of the fifth region and the thickness T6 of the sixth region satisfy: T5 > T6.

[0020] According to some embodiments of the present invention, the thickness T5 of the fifth region and the thickness T6 of the sixth region satisfy: 1 ​​< T5 / T6 ≤ 2.1; and / or, the thickness T5 of the fifth region satisfies: 1 mm ≤ T5 ≤ 1.6 mm; and / or, the thickness T6 of the sixth region satisfies: 0.6 mm ≤ T6 ≤ 1 mm.

[0021] According to some embodiments of the present invention, the length M9 of the fifth region along the second direction satisfies: 134mm ≤ M9 ≤ 154mm; and / or, the length M10 of the sixth region along the second direction satisfies: 142mm ≤ M10 ≤ 175mm; and / or, the length M11 of the third transition region along the second direction satisfies: 36mm ≤ M11 ≤ 52mm; and / or, the second arm beam has two opposing third edges along the second direction, the third edges forming a second edge region with the adjacent fifth region, the thickness of the second edge region being equal to the thickness of the fifth region, and the length M12 of the second edge region along the second direction satisfies: 51mm ≤ M12 ≤ 196mm.

[0022] Thirdly, this application provides a battery pack including the aforementioned support device.

[0023] Fourthly, this application provides a workpiece processing method suitable for processing at least one of the pallet device, first arm beam, and second arm beam of the aforementioned supporting equipment. The method includes: pre-treating the raw material to be processed; inputting the raw material to be processed into a rolling mill for rolling; adjusting the rolling force of the rolling mill according to a preset dimensional curve to obtain a rolled part; and stamping the rolled part to obtain a target product. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0025] Figure 1 This is a schematic diagram of the supporting device according to an embodiment of this application;

[0026] Figure 2This is an exploded view of the supporting device according to an embodiment of this application;

[0027] Figure 3 This is a schematic diagram of the tray device according to an embodiment of this application;

[0028] Figure 4 This is a schematic diagram of the structure of the first arm beam in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of the structure of the second arm beam in an embodiment of this application;

[0030] Figure 6 This is a step diagram of a workpiece processing method according to an embodiment of this application.

[0031] Figure label:

[0032] 100-Tray device;

[0033] 110 - Panel body; 111 - First edge; 112 - Lifting part; 113 - First area; 114 - Second area; 115 - First transition area; 116 - Lifting hole; 117 - Second edge; 118 - First edge area;

[0034] 200 - Supporting equipment;

[0035] 210 - First arm beam; 211 - Third region; 212 - Fourth region; 213 - Second transition zone;

[0036] 220 - Second arm beam; 221 - Mounting hole; 222 - Fifth zone; 223 - Sixth zone; 224 - Third transition zone; 225 - Second edge zone;

[0037] 230 - Sleeve component.

[0038] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0039] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0040] With the rapid development of the new energy vehicle industry, the power battery system, as its core component, faces increasingly stringent requirements regarding safety, energy density, and lightweighting. The battery pack tray, as a key structural component that supports and protects the battery cell modules, must not only possess sufficient strength and rigidity to withstand complex conditions such as mechanical shock, vibration, and thermal deformation, but also minimize its own weight while ensuring structural reliability, thereby improving the vehicle's energy efficiency and range.

[0041] Currently, the industry widely uses roll forming technology to manufacture steel battery pack trays, and the mainstream approach is based on thick steel plates (i.e., uniform thickness plates) as raw materials. While this approach has advantages such as mature technology, short mold development cycle, and high production efficiency, it has significant limitations in structural design: to meet the strength and stiffness requirements of local high-load areas, the entire tray must use uniformly thick plates, resulting in a large amount of redundant material accumulation in non-critical load-bearing areas.

[0042] Although some studies have attempted to optimize the pallet structure by using local reinforcement or introducing lightweight materials such as aluminum alloys, these methods often lead to problems such as complicated welding processes, reduced connection reliability, increased costs, or difficulties in recycling, making it difficult to balance performance, cost, and manufacturing efficiency in large-scale mass production.

[0043] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0044] For ease of description and understanding, the first direction can be the width direction of the disk body, that is... Figure 1 The X direction shown can be the second direction, which can be the length direction of the disk body. Figure 1 Y direction shown.

[0045] refer to Figures 1 to 3 In a first aspect, embodiments of this application provide a pallet device 100, which includes a roll-formed pallet body 110.

[0046] The tray body 110 is the basic load-bearing structure of the tray device 100, used to support and fix the battery module and transfer external loads. The tray body 110 is manufactured using a roll forming process, which balances structural integrity and manufacturing efficiency.

[0047] The disk body 110 has two first edges 111 that are opposite each other along a first direction. The first edges 111 extend along a second direction, and the first direction is perpendicular to the second direction. That is to say, the first edges 111 can be the long side of the disk body 110.

[0048] A portion of the structure of the first edge 111 protrudes along the first direction to form multiple lifting parts 112. The multiple lifting parts 112 are spaced apart along the second direction, and the lifting and positioning functions of the battery pack are realized through the lifting parts 112 during vehicle assembly, transportation or maintenance.

[0049] Understandably, the hoisting section 112, as a high stress concentration area, has higher requirements for local strength and rigidity than other areas of the main body 110.

[0050] The disk body 110 has a plurality of first regions 113 arranged at intervals along a second direction. The lifting part 112 is located at least in the first region 113. In this embodiment, the first region 113 can be a thickened region of the disk body 110. Along the second direction (the length direction of the disk body 110), the first region 113 at least covers the corresponding lifting part 112. The width of the first region 113 along the second direction can be equal to that of the lifting part 112, or the two ends of the first region 113 along the second direction can extend beyond the lifting part 112.

[0051] A second region 114 is provided between two adjacent first regions 113. The thickness T1 of the first region 113 and the thickness T2 of the second region 114 satisfy: T1 > T2. That is to say, in this embodiment, the first region 113 constitutes the key functional area of ​​the disk body 110 that bears the main mechanical load (such as hoisting force, installation reaction force, collision impact, etc.), and the second region 114 is a non-critical force-bearing area or low-load area on the disk body 110, which mainly plays a connecting and sealing role.

[0052] By making the thickness T1 of the first region 113 greater than the thickness T2 of the second region 114, sufficient material is retained in the high-load region to ensure strength and stiffness, while the weight is reduced in the low-load region, thereby achieving lightweighting without sacrificing the structural safety of the disk body 110.

[0053] The first region 113 and the second region 114 are connected by a first transition zone 115. The first transition zone 115 achieves a smooth transition in thickness from T1 to T2, avoiding stress concentration or forming cracks caused by abrupt changes in cross-section, while ensuring the feasibility of the roll forming process for the disc body 110.

[0054] The pallet device 100 of this application maintains a large thickness in the high-load area corresponding to the first region 113, ensuring the strength and rigidity requirements under lifting, installation, and collision conditions, thereby improving the safety of the battery pack. The non-critical load-bearing area corresponding to the second region 114 is thinned, reducing unnecessary material usage and thus reducing the weight of the pallet device 100, which in turn helps to improve the energy density of the battery pack and the overall vehicle range.

[0055] Meanwhile, the disc body 110 adopts a roll forming process to achieve a variable thickness structure, eliminating the need for welding, riveting, or composite material connections, thus avoiding the introduction of additional process complexity and failure risks, and improving production efficiency.

[0056] refer to Figure 3 In some embodiments, the thickness T1 of the first region 113 and the thickness T2 of the second region 114 satisfy: 1 ​​< T1 / T2 ≤ 2.1. For example, T1 and T2 can be 1.01, 1.3, 1.5, 1.7, 1.9 or 2.1. Of course, T1 and T2 can also be other values, which are not limited in this application.

[0057] On the one hand, it avoids the thickness difference between the first region 113 and the second region 114 being too small, resulting in poor weight reduction, or the overall thickness of the first region 113 and the second region 114 being too small, affecting the structural strength of the pallet device 100. On the other hand, it avoids the thickness difference between the first region 113 and the second region 114 being too large, which could cause material cracking or uncontrolled springback of the pallet device 100 during the roll forming process due to excessive abrupt changes in cross-section.

[0058] The thickness T1 of the first region 113 satisfies: 1mm≤T1≤1.6mm; for example, T1 can be 1mm, 1.2mm, 1.4mm or 1.6mm, and of course T1 can also be other values, which are not limited in this application.

[0059] On the one hand, it avoids the first region 113 being too thin, which would result in insufficient bending stiffness and yield strength under extreme working conditions such as hoisting and collision, leading to plastic deformation or failure. On the other hand, it avoids the first region 113 being too thick, which would increase the weight of the disc body 110 and cause material redundancy. At the same time, it does not exceed the upper limit of the formable thickness of mainstream materials (such as DP600 and HC420LA) in the roll forming process, ensuring the forming reliability of the disc body 110.

[0060] The thickness T2 of the second region 114 satisfies: 0.6mm≤T2≤1mm. For example, T2 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm. Of course, T2 can also be other values, which are not limited in this application.

[0061] On the one hand, it is necessary to avoid the second region 114 being too thin, which would result in poor dent resistance and thus affect the structural strength of the tray body 110. On the other hand, it is necessary to avoid the second region 114 being too thick, which would result in a large overall weight of the tray body 110 and affect the lightweight effect of the tray device 100.

[0062] In some embodiments, the lifting part 112 has a lifting hole 116 extending along the thickness direction. The lifting hole 116 is used to cooperate with the vehicle lifting fixture or assembly jig to realize the reliable lifting, positioning and installation of the battery pack.

[0063] The distance between the axes of two adjacent lifting holes 116 along the second direction is M5. M5 reflects the arrangement density of the lifting points and directly affects the uniformity of stress and the overall bending deformation of the pallet during the lifting process. If M5 is too large, it will lead to an increase in the mid-span bending moment between two adjacent lifting parts 112, which may easily cause the middle of the pallet device 100 to deflect downwards; if M5 is too small, it may cause redundancy of lifting points, increasing weight and cost.

[0064] The length of the second region 114 along the second direction is M2. The length of the non-critical stress area or low load area is an important parameter that determines the overall flexibility and local stability of the pallet device 100.

[0065] The relationship between M5 and M2 satisfies: 0.35≤M2 / M5≤0.65. For example, M2 / M5 can be 0.35, 0.4, 0.45, 0.5, 0.55, 0.6 or 0.65. Of course, M2 / M5 can also be other values, which are not limited in this application.

[0066] M2 / M5 reflects the area occupied by the second region 114 between the two lifting sections 112. The larger the area occupied by the second region 114, the better the lightweight effect of the pallet device 100. However, the structural strength of the lifting section 112 is correspondingly reduced.

[0067] On the one hand, avoiding excessively small M2 / M5 ratios and excessively short second region 114 would mean that the first region 113 is too dense, limiting the space for material thinning and weakening the lightweight effect; at the same time, too many lifting points may cause stress fields to interfere with each other, reducing the fatigue life of the pallet body 110. On the other hand, avoiding excessively large M2 / M5 ratios and excessively long second region 114 with sparse lifting points would make the pallet device 100 prone to excessive deflection or buckling instability in the second region 114 during lifting or transportation, affecting structural safety and assembly accuracy.

[0068] In some embodiments, the length M1 of the first region 113 along the second direction satisfies: 134mm≤M1≤154mm; for example, M1 can be 134mm, 139mm, 145mm, 149mm or 154mm, and of course M1 can also be other values, which are not limited in this application.

[0069] This ensures that the length M1 of the first region 113 is within a suitable range, providing sufficient load-bearing area in the high-load concentration area of ​​the disk body 110 to distribute lifting forces, installation reaction forces, and local impact loads, preventing excessive stress concentration that could lead to yielding or cracking of the disk body 110. Simultaneously, it avoids excessive length of the first region 113, which would result in material redundancy and affect the lightweight effect of the disk body 110.

[0070] The length M2 of the second region 114 along the second direction satisfies: 142mm≤M2≤175mm; for example, M2 can be 142mm, 145mm, 155mm, 165mm or 175mm, and of course M2 can also be other values, which are not limited in this application.

[0071] On the one hand, it avoids the second region 114 being too small, which would affect the lightweight effect of the disk body 110. On the other hand, it avoids the second region 114 being too large, which would result in insufficient stiffness in the middle of the second region 114 along the second direction. Under the weight of the disk body 110 or thermal expansion, buckling or vibration amplification would occur in the middle of the second region 114, affecting the structural reliability of the disk body 110.

[0072] The length M3 of the first transition zone 115 along the second direction satisfies: 36mm≤M3≤52mm; for example, M3 can be 36mm, 40mm, 44mm, 48mm or 52mm, and of course M3 can also be other values, which are not limited in this application.

[0073] On the one hand, it avoids the first transition zone 115 being too short, which would cause the thickness change between the first region 113 and the second region 114 of the disc body 110 to be too drastic, making it easy for material to accumulate, crack, or lose control of springback during the rolling process; on the other hand, it avoids the first transition zone 115 being too long, which would affect the lightweight design of the disc body 110 and may introduce unnecessary bending flexibility, causing unnecessary deformation of the disc body 110.

[0074] Understandably, in this embodiment, the distance M5 between the axes of two adjacent lifting holes 116 along the second direction is M1 / 2 + M2 + 2M3.

[0075] The disk body 110 has two second edges 117 (that is, the two wide sides of the disk body 110) that are opposite each other along the second direction. The second edges 117 and the adjacent first region 113 form a first edge region 118. The thickness of the first edge region 118 is equal to the thickness of the first region 113, and the length M4 of the first edge region 118 along the second direction satisfies: 51mm≤M4≤196mm. For example, M4 can be 51mm, 100mm, 150mm, 190mm or 196mm. Of course, M4 can also be other values, and this application does not limit it.

[0076] By providing first edge regions 118 at both ends of the pallet body 110 along the length direction, the first edge regions 118 have suitable length dimensions, which helps to strengthen the rigidity of the longitudinal ends of the pallet device 100 and prevent the pallet device 100 from curling or tearing at the edges during assembly, transportation or collision.

[0077] Understandably, due to different specific structural designs of the battery pack, the length dimensions of the two first edge regions 118 along the second direction may be the same, or the length dimensions of the two first edge regions 118 along the second direction may be different.

[0078] In some embodiments, the length M3 of the first transition zone 115 along the second direction and the strength φ of the disk body 110 satisfy: M3≥[(1.15*φ / 30)±3]*(T1-T2). Where T1-T2 is the thickness difference ΔT between the first region 113 and the second region 114, and (1.15*φ / 30)±3 can be written as the transition zone safety factor K1. That is, the above expression can be written as M3 / ΔT≥K1. Generally speaking, the higher the material strength φ, the lower its ductility (especially for high-strength steel). It is more sensitive to abrupt changes in cross-section during roll forming and is prone to cracking or springback. The length M3 of the first transition zone 115 and the thickness difference ΔT between the first region 113 and the second region 114 can characterize the structural stability of the first transition zone 115. The larger M3 / ΔT is, the smoother the transition between the first region 113 and the second region 114, and the more stable the structure of the tray device 100. The smaller M3 / ΔT is, the larger the abrupt change in transition between the first region 113 and the second region 114, and the easier it is to generate stress concentration. By M3 / ΔT≥K1, the first transition zone 115 can meet the forming requirements without sacrificing the functional layout.

[0079] Understandably, the safety factor K1 in the transition zone is related to the material selection.

[0080] refer to Figure 1 , Figure 2 and Figure 3 Secondly, this application provides a support device 200 for supporting a battery pack. The support device 200 includes: the aforementioned tray device 100, two first arm beams 210, and two second arm beams 220.

[0081] The tray body 110 of the tray device 100 has a support surface and a support surface opposite each other in the thickness direction. The support surface is used to install the battery cell assembly related components, and the support surface is used to connect with the whole vehicle or the substructure.

[0082] Two first arm beams 210 are provided on the support surface and are arranged at intervals along the second direction. The two first arm beams 210 define the installation space for accommodating the battery cell assembly. As the main load-bearing component inside the battery pack, the first arm beams 210 directly bear the gravity, thermal expansion force and vibration load of the battery cell assembly and transfer the load to the disk body 110 below.

[0083] Optionally, the position of the first arm beam 210 can be aligned with the first region 113 of the disk body 110 to ensure that the high load path is transmitted through the high-thickness area and avoid the weak area being stressed.

[0084] Two second arm beams 220 are provided on the support surface. The second arm beams 220 extend along the second direction and at least partially overlap with the first edge 111. That is, there is an overlapping area between the second arm beams 220 and the first edge 111 (for example, the lifting part 112 overlaps with the second arm beams 220), thereby obtaining sufficient local support strength.

[0085] The second arm beam 220 is provided with multiple mounting holes 221 that run through the thickness direction. The mounting holes 221 correspond one-to-one with the lifting holes 116 on the main body 110 of the disc, forming a vertically connected channel. The second arm beam 220 can serve as a mechanical interface between the supporting equipment 200 and the external structure (such as the body longitudinal beam, subframe or test bench), and undertake the functions of vehicle installation, lifting and transmission of collision loads.

[0086] Understandably, in this embodiment, the middle part of the disk body 110 can be recessed toward the support surface, on the one hand forming a housing structure for the battery cell assembly, and on the other hand making the first edge 111 relatively protrude to form an installation space for accommodating the second arm beam 220, so as to facilitate the connection between the second arm beam 220 and the disk body 110.

[0087] The sleeve 230 is fixedly installed in the mounting hole 221, and the sleeve 230 passes through the lifting hole 116 and is fixedly connected to the disk body 110. In this way, the sleeve 230 helps to enhance the shear and tensile strength of the connection, prevents the bolts from directly acting on the thin-walled steel plate on the lifting part 112 and the second arm beam 220, which would cause the edges of the mounting hole 221 and the lifting hole 116 to tear. At the same time, the sleeve 230 can also isolate the relative displacement between the second beam arm and the disk body 110, and improve the connection stiffness and fatigue durability between the disk body 110 and the second arm beam 220.

[0088] The support device 200 of this application, by using the aforementioned pallet device 100, achieves a lightweight design while maintaining sufficient structural strength, thus avoiding redundant material waste and saving production costs.

[0089] Understandably, the disk body 110 can be fixed to the first arm beam 210, the second arm beam 220, and the sleeve 230 by welding.

[0090] In some embodiments, the length D1 of the lifting portion 112 of the pallet device 100 along the second direction and the outer diameter D2 of the sleeve 230 satisfy the following condition: D1 / D2≥2.

[0091] The length D1 of the lifting section 112 along the second direction refers to the projected dimension of the lifting section 112 in the longitudinal direction (second direction) of the pallet device 100, reflecting the bearing area and structural stability of the lifting section 112. The outer diameter D2 of the sleeve 230 refers to the outer diameter of the sleeve 230 that is embedded in the mounting hole 221 and passes through the lifting hole 116, which directly affects the connection strength and local stress distribution between the main body and the second arm beam 220.

[0092] By ensuring that D1 / D2 ≥ 2, sufficient material width is maintained between the outer edge of the sleeve 230 and the boundary of the lifting part 112 after installation, preventing hole edge tearing or local buckling under tensile, shear, or eccentric loads. Simultaneously, this ensures uniform stress distribution between the sleeve 230 and the second arm beam 220, preventing stress concentration at the connection points between the sleeve 230 and the lifting part 112 and the second arm beam 220, which could lead to detachment.

[0093] refer to Figure 1 , Figure 2 and Figure 4 In some embodiments, the first arm beam 210 is roll-formed and has a third region 211 and a fourth region 212 arranged at intervals along a first direction, and the third region 211 and the fourth region 212 are connected by a second transition region 213.

[0094] The third region 211 corresponds to the position in the first beam arm that bears a higher local load, such as the contact point with the battery cell module mounting bracket or the end constraint area; the fourth region 212 is located in the non-critical stress section of the first beam arm, mainly serving a connection or enclosure function, and has a lower load level.

[0095] Specifically, the thickness T3 of the third region 211 and the thickness T4 of the fourth region 212 satisfy the condition: T3 > T4. This establishes a gradient thickness distribution within the first beam arm: a larger thickness is retained in the high-load area to ensure strength and stiffness, while the thickness is reduced in the low-load area to decrease weight. During battery operation, thermal expansion occurs; insufficient stiffness in the first beam arm 210 could easily lead to excessive constraint reaction forces. Region T3 provides localized high stiffness, effectively controlling the module displacement boundary, while the moderate flexibility of region T4 can absorb some thermal strain and reduce internal structural stress.

[0096] In addition, in this embodiment, both the pallet body 110 and the first beam arm are formed by variable thickness roll forming, which can share the same type of high-strength steel coil and some roll forming passes, reducing production line switching costs and improving supply chain integration efficiency.

[0097] According to some embodiments of the present invention, the thickness T3 of the third region 211 and the thickness T4 of the fourth region 212 satisfy: 1 ​​< T3 / T4 ≤ 2.1; for example, T3 / T4 can be 1.01, 1.3, 1.5, 1.7, 1.9 or 2.1, and of course T3 / T4 can also be other values, which are not limited in this application.

[0098] On the one hand, it avoids the thickness difference between the third region 211 and the fourth region 212 being too small, resulting in poor weight reduction, or the overall thickness of the third region 211 and the fourth region 212 being too small, affecting the structural strength of the pallet device 100. On the other hand, it avoids the thickness difference between the third region 211 and the fourth region 212 being too large, which could cause material cracking or uncontrolled springback of the pallet device 100 during the roll forming process due to excessive abrupt changes in cross-section.

[0099] The thickness T3 of the third region 211 satisfies: 1mm≤T3≤1.6mm; for example, T3 can be 1mm, 1.2mm, 1.4mm or 1.6mm, and of course T3 can also be other values, which are not limited in this application.

[0100] On the one hand, it avoids the third region 211 being too thin, which would cause the bending stiffness of the first arm beam 210 to yield locally under the action of vibration and thermal expansion reaction force of the battery cell assembly; on the other hand, it avoids the third region 211 being too thick, which would lead to an increase in the weight of the first arm beam 210 and material redundancy, while not exceeding the upper limit of the formable thickness of mainstream materials (such as DP600, HC420LA) in the roll forming process, so as to ensure the forming reliability of the first arm beam 210.

[0101] The thickness T4 of the fourth region 212 satisfies: 0.6mm≤T4≤1mm; for example, T4 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, and of course T4 can also be other values, which are not limited in this application.

[0102] On the one hand, it avoids the fourth region 212 being too thin, which would affect the structural stability of the first arm beam 210. On the other hand, it avoids the fourth region 212 being too thick, which would result in a large overall weight of the first arm beam 210, affecting the lightweight effect of the supporting equipment 200.

[0103] The length M6 of the third region 211 along the first direction satisfies: 500mm≤M6≤525mm; for example, M6 can be 500mm, 505mm, 510mm, 515mm, 520mm or 525mm, and of course M6 can also be other values, which are not limited in this application.

[0104] This provides continuous high-strength support to the end of the battery cell assembly along the second direction, improving the reliability of the support device 200 in fixing the battery cell assembly.

[0105] The length M7 of the fourth region 212 along the first direction satisfies: 48mm≤M7≤56mm; for example, M7 can be 48mm, 50mm, 52mm, 54mm or 56mm, and of course M7 can also be other values, which are not limited in this application.

[0106] On the one hand, it avoids the fourth region 212 being too long, which weakens the overall strength of the first arm beam 210. On the other hand, it avoids the fourth region 212 being too short, which would result in poor end forming of the first arm beam 210.

[0107] The length M8 of the second transition zone 213 along the first direction satisfies: 36mm≤M8≤52mm. For example, M8 can be 36mm, 40mm, 44mm, 48mm or 52mm. Of course, M8 can also be other values, which are not limited in this application.

[0108] On the one hand, it avoids the second transition zone 213 being too short, which would cause the thickness change between the third region 211 and the fourth region 212 of the first arm beam 210 to be too drastic, making it easy for material to accumulate, crack, or lose control of springback during the rolling process; on the other hand, it avoids the second transition zone 213 being too long, which would affect the lightweight design of the first arm beam 210 and may introduce unnecessary bending flexibility, causing unnecessary deformation of the first arm beam 210.

[0109] refer to Figure 1 , Figure 2 and Figure 5 In some embodiments, the second arm beam 220 is roll-formed. The second arm beam 220 adopts the roll forming process to achieve a variable thickness structure, which eliminates the need for welding, riveting or composite material connection, avoids introducing additional process complexity and failure risk, and helps to improve production efficiency.

[0110] The second arm beam 220 has multiple fifth regions 222 arranged at intervals along the second direction. The first region 113 corresponds one-to-one with the fifth region 222. The projection of the first region 113 along the thickness direction is located within the projection of the fifth region 222 along the thickness direction. In this way, the external installation load can be transferred through the fifth region 222 to the first region 113 of the pallet device 100 to form a completely overlapping force flow path, avoiding load eccentricity or diffusion to weak areas and improving the reliability of the supporting equipment 200.

[0111] A sixth region 223 is provided between two adjacent fifth regions 222. The fifth region 222 and the sixth region 223 are connected by a third transition zone 224. The sixth region 223 is a non-critical stress area or low load area on the second arm beam 220, which mainly plays a connecting and sealing role. The third transition zone 224 realizes a smooth transition of thickness from T5 to T6, avoiding stress concentration or forming cracks caused by abrupt cross section, while ensuring the process feasibility of forming the second arm beam 220 by roll forming.

[0112] The thickness T5 of the fifth region 222 and the thickness T6 of the sixth region 223 satisfy: T5 > T6. By making the thickness T5 of the fifth region 222 greater than the thickness T6 of the sixth region 223, sufficient material is retained in the high-load region to ensure strength and stiffness, and the thickness is reduced in the low-load region to reduce weight, thereby achieving lightweighting without sacrificing the structural safety of the disk body 110.

[0113] According to some embodiments of the present invention, the thickness T5 of the fifth region 222 and the thickness T6 of the sixth region 223 satisfy: 1 ​​< T5 / T6 ≤ 2.1; for example, T5 / T6 can be 1.01, 1.3, 1.5, 1.7, 1.9 or 2.1, and of course T5 / T6 can also be other values, which are not limited in this application.

[0114] On the one hand, it avoids the thickness difference between the fifth region 222 and the sixth region 223 being too small, resulting in poor weight reduction, or the overall thickness of the fifth region 222 and the sixth region 223 being too small, affecting the structural strength of the supporting equipment 200. On the other hand, it avoids the thickness difference between the fifth region 222 and the sixth region 223 being too large, which could cause material cracking or uncontrolled springback of the second arm beam 220 during the roll forming process due to excessive abrupt changes in cross-section.

[0115] The thickness T5 of the fifth region 222 satisfies: 1mm≤T5≤1.6mm; for example, T5 can be 1mm, 1.2mm, 1.4mm or 1.6mm, and of course T5 can also be other values, which are not limited in this application.

[0116] On the one hand, to avoid the fifth region 222 being too thin, which would result in insufficient tensile and shear strength of the second arm beam 220 when subjected to vehicle installation preload, lifting impact, or lateral collision loads, leading to localized plastic deformation or tearing around the mounting hole 221. On the other hand, to avoid the fifth region 222 being too thick, which would increase the weight of the second arm beam 220 and create material redundancy, while also ensuring that the thickness does not exceed the upper limit of the formable thickness of mainstream materials (such as DP600 and HC420LA) in the roll forming process, thus ensuring the forming reliability of the second arm beam 220.

[0117] The thickness T6 of the sixth region 223 satisfies: 0.6mm≤T6≤1mm. For example, T6 can be 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm. Of course, T6 can also be other values, which are not limited in this application.

[0118] On the one hand, it is necessary to avoid the sixth region 223 being too thin, which would result in poor structural continuity of the sixth region 223, leading to buckling instability and thus affecting the reliability of welding / riveting between the second arm beam 220 and other structures. On the other hand, it is necessary to avoid the sixth region 223 being too thick, which would result in a large overall weight of the second arm beam 220 and affect the lightweight effect of the supporting equipment 200.

[0119] According to some embodiments of the present invention, the length M9 of the fifth region 222 along the second direction satisfies: 134mm≤M9≤154mm; for example, M9 can be 134mm, 139mm, 145mm, 149mm or 154mm, and of course M5 can also be other values, which are not limited in this application.

[0120] On the one hand, it prevents the length of the fifth region 222 from being too small, which would lead to stress concentration and affect the structural reliability of the supporting equipment 200. On the other hand, it prevents the length of the fifth region 222 from being too large, which would result in material redundancy and affect the lightweight effect of the supporting equipment 200.

[0121] The length M10 of the sixth region 223 along the second direction satisfies: 142mm≤M10≤175mm; for example, M10 can be 142mm, 145mm, 155mm, 165mm or 175mm, and of course M10 can also be other values, which are not limited in this application.

[0122] On the one hand, it avoids the sixth region 223 being too small, which would affect the lightweight effect of the supporting equipment 200. On the other hand, it avoids the sixth region 223 being too large, which would result in insufficient stiffness in the middle of the sixth region 223 along the second direction. Under the weight of the second arm beam 220 or thermal expansion, buckling or vibration amplification would occur in the middle of the sixth region 223, affecting the structural reliability of the second arm beam 220.

[0123] The length M11 of the third transition region 224 along the second direction satisfies: 36mm≤M11≤52mm; for example, M11 can be 36mm, 40mm, 44mm, 48mm or 52mm, and of course M11 can also be other values, which are not limited in this application.

[0124] On the one hand, to avoid the third transition zone 224 being too short, the thickness change between the fifth region 222 and the sixth region 223 of the second arm beam 220 is too drastic, which may easily cause material accumulation, cracking or uncontrolled springback during the rolling process; on the other hand, to avoid the third transition zone 224 being too long, which would affect the lightweight design of the support device and may introduce unnecessary bending flexibility, causing unnecessary deformation of the second arm beam 220.

[0125] The second arm beam 220 has two opposing third edges along the second direction. The third edges and the adjacent fifth region 222 form a second edge region 225. The thickness of the second edge region 225 is equal to the thickness of the fifth region 222, and the length M12 of the second edge region 225 along the second direction satisfies: 51mm≤M12≤196mm. For example, M12 can be 51mm, 100mm, 150mm, 190mm or 196mm. Of course, M12 can also be other values, which are not limited in this application.

[0126] By providing second edge regions 225 at both ends of the second arm beam 220 along the length direction, the second edge regions 225 have suitable length dimensions, which helps to strengthen the rigidity of the longitudinal end of the supporting equipment 200 and prevent the supporting equipment 200 from curling or tearing at the edges during assembly, transportation or collision.

[0127] Thirdly, this application provides a battery pack including the aforementioned support device 200.

[0128] refer to Figure 6 The battery pack of this application uses the aforementioned support device 200, which is lighter in weight. Given a fixed weight of the power supply device that the electrical equipment can carry, the power supply device can carry a heavier battery pack, which is beneficial to improving the battery pack's range.

[0129] Fourthly, this application provides a workpiece processing method suitable for processing at least one of the pallet device 100, the first arm beam 210, and the second arm beam 220 of the aforementioned support device 200. That is, the pallet device 100, the first arm beam 210, and the second arm beam 220 can all be processed by the following method.

[0130] The method includes the following steps:

[0131] S1: Pretreatment of raw materials to be processed;

[0132] S2: Input the raw material to be processed into the rolling device for rolling;

[0133] S3: Adjust the rolling force of the roller press according to the preset size curve to obtain the rolled part;

[0134] S4: Stamp the rolled part to obtain the target product.

[0135] In step S1, high-strength steel coils (such as DP600, HC420LA, HC780LAD+Z, etc.) are fed into a cleaning unit. Alkaline degreasing solution or high-pressure water jet is used to remove surface grease, scale, and impurities, preventing contamination of the roll surface or surface defects during rolling. After cleaning, the strip passes through a multi-roll straightener to eliminate internal stress and wavy edges generated during coiling, ensuring straightness before entering the rolling mill. This provides clean, flat, and stress-uniform raw materials for subsequent rolling, ensuring the quality of variable thickness forming.

[0136] In step S2, the rolling device can be a TRB rolling mill, which includes an uncoiling machine, a tension control system, a heating module, an adjustable roll gap mill, and an online measurement and control system.

[0137] Specifically, the rolling parameters can be as follows: using high-hardness alloy work rolls with a diameter of 300mm to 500mm, which have high rigidity and wear resistance; the total rolling force range is 2000kN to 8000kN; induction heating or radiation heating units are set in the rolling entry area to precisely control the temperature of local areas of the strip (usually heated to 300 to 600℃) to reduce deformation resistance and improve the forming ability of high-strength steel;

[0138] The rolling mill is equipped with a servo hydraulic system that can dynamically adjust the gap between the upper and lower work rolls according to the preset target thickness curve (such as the thickness distribution corresponding to M1 / M2 / M3 or M6 / M7 / M8).

[0139] In step S3, a preset size curve can be obtained through a topology optimization algorithm:

[0140] First, a detailed three-dimensional finite element model is constructed based on the target product's usage scenario and load conditions. This model includes key components such as the pallet device 100, the first arm beam 210, and the second arm beam 220, and fully considers their stress conditions under actual working conditions, such as static loads and dynamic impacts.

[0141] Then, an advanced topology optimization algorithm is employed to determine the optimal thickness gradient value and the distribution parameters of variable thickness regions for the plate material, while satisfying design constraints such as structural strength, stiffness, and stability. During this process, the material layout is continuously adjusted through iterative calculations until the optimal solution is reached, ensuring that the thickness of each region accurately matches the actual stress level it bears.

[0142] Preset Dimension Curve Generation and Real-Time Adjustment: Based on topology optimization results, a precise thickness distribution curve (i.e., the target thickness function T(x)) is generated along the rolling direction. This curve considers not only mechanical performance requirements but also the feasibility of the manufacturing process. During rolling, the servo hydraulic system of the TRB rolling mill adjusts the distance between the upper and lower work rolls in real time according to this preset dimensional curve to achieve the desired thickness variation.

[0143] To ensure the final product meets design requirements, laser thickness gauges or X-ray thickness gauges are installed at the exit of the TRB rolling mill to monitor the strip thickness in real time. The acquired data is fed back to the control system, which uses a PID algorithm to dynamically adjust the rolling force and roll gap, thereby achieving precise control over the thickness tolerance (typically within ±0.05mm), ensuring that the thickness of each millimeter is strictly in accordance with the optimized design scheme.

[0144] In step S4, for the pallet device 100, during the stamping process, the double-sided variable thickness structure of the raw material sheet is transformed into a single-sided variable thickness structure (i.e., only the bottom surface retains the thickness gradient, and the top surface is flat) to meet the flatness requirements of the bonding surface of the battery cell assembly, as well as the welding and assembly consistency requirements with the first arm beam 210 and the second arm beam 220.

[0145] Understandably, the first arm beam 210 and the second arm beam 220 also need to be rolled to meet assembly requirements.

[0146] The workpiece processing method of this application allows for flexible adjustment of the rolling force during the rolling process, enabling the target product to be thickened only where necessary. This facilitates lightweight design, and the variable thickness design of the target product allows for the formation of reinforced structures in areas of concentrated load, eliminating the need for welding reinforcing ribs or reinforcing plates.

[0147] This ensures continuous production, eliminates the heat-affected zone (HAZ) from welds on the target product, and helps save on raw material costs while increasing production efficiency.

[0148] The supporting device is tested below through multiple embodiments and comparative examples:

[0149] Example 1

[0150] High-strength steel is selected to support the pallet device, the first arm beam, and the second arm beam. The strength of the high-strength steel is φ780MPa, and the safety factor K1 of the transition zone is 28.

[0151] The method for obtaining material strength is as follows: the sample battery pack tray is cut into specimens, and tensile test specimens are cut according to GB / T 228.1 "Metallic materials - Tensile testing - Part 1: Test at room temperature". Tensile tests are performed according to this standard, and the material strength is obtained by analyzing the test results.

[0152] D1 / D2 is 2.1, M3 / △T is 29, and M2 / M5 is 0.63.

[0153] Example 2

[0154] The difference from Example 1 is that D1 / D2 is 3.

[0155] Example 3

[0156] The difference from Example 1 is that M3 / △T is 35.

[0157] Example 4

[0158] The difference from Example 1 is that M2 / M5 is 0.45.

[0159] Comparative Example 1

[0160] The difference from Example 1 is that D1 / D2 is 1.9.

[0161] Comparative Example 2

[0162] The difference from Example 1 is that D1 / D2 is 1.

[0163] Comparative Example 3

[0164] The difference from Example 1 is that M3 / △T is 27.

[0165] Comparative Example 4

[0166] The difference from Example 1 is that M3 / △T is 20.

[0167] Comparative Example 5

[0168] The difference from Example 1 is that M2 / M5 is 0.67.

[0169] Comparative Example 6

[0170] The difference from Example 1 is that M2 / M5 is 0.85.

[0171] Comparative Example 7

[0172] The difference from Example 1 is that M2 / M5 is 0.33.

[0173] Comparative Example 8

[0174] The difference from Example 1 is that M2 / M5 is 0.25.

[0175] The samples from the above embodiments and comparative examples were subjected to high-temperature vibration tests:

[0176] Test conditions: 38℃, 45℃, 50℃; SOC≥95%; 25.2 hours of random vibration + 3.6 hours of fixed-frequency vibration for each axis.

[0177] Data Recording: Before the test: Battery pack sampling number, total voltage detected by BMS, cell voltage and temperature data, battery pack discharge capacity, discharge energy, DC internal resistance, and test photos;

[0178] The experiment included: voltage curve, temperature curve, actual PSD test curve, and test photos.

[0179] Post-test data: total voltage, cell voltage and temperature data, insulation resistance, battery pack discharge capacity, discharge energy, DC internal resistance, and test photos as measured by the BMS.

[0180] Test results requirements: a. During charging, discharging, or resting (excluding the switching process between charging, discharging, and resting), the individual cell voltage should not change sharply (the absolute value of the voltage difference between individual cells should not exceed 0.15V / s during resting, and not exceed 1V / s during charging and discharging), and the individual cell temperature should not change sharply (temperature change rate ≤2℃ / 1s).

[0181] b. Ensure reliable connections and structural integrity, with no leaks, cracked casings, fires, or explosions in the battery pack or system;

[0182] c. CAN communication sampling is normal;

[0183] d. After the test, measure the insulation resistance, insulation withstand voltage and capacitance, DC internal resistance, airtightness of the cooling pipeline, and whether the temperature rise during charging and discharging triggers the temperature protection.

[0184] e. After the test, conduct an airtightness test or an IPX8 watertightness test.

[0185] f. After the test, record the torque decay of all screws around the battery pack. Rigid sealing bolts must meet a static torque ≥ 80% * required torque, and elastic sealing bolts must meet a static torque ≥ 70% * required torque. Open the cover and check and record the internal power distribution, cells, copper and aluminum cable harnesses, trays, and BMS of the battery pack.

[0186] g. After the test, the BPS functioned normally.

[0187] Judgment method: After the high temperature vibration test, damage detection should be carried out on the welds and the first transition zone between the components. By applying a developer, it can be determined whether the welds and the first transition zone are cracked.

[0188] Regarding the determination of weight reduction: The weight reduction is the weight of a uniform thickness tray that meets the same strength requirements minus the weight of the corresponding sample.

[0189] The following is a table of test results:

[0190]

[0191] In conjunction with Examples 1, 2, Comparative Example 1, and Comparative Example 2, the smaller the ratio of the length of the lifting part to the outer diameter of the sleeve, the better the weight reduction effect. However, a smaller ratio of the length of the lifting part to the outer diameter of the sleeve will sacrifice the strength of the lifting part. When D1 / D2 < 2, the support device will not be able to meet the structural strength requirements of the battery pack.

[0192] In conjunction with Examples 1, 3, 3, and 4, a larger M3 / ΔT is beneficial to improving the structural stability of the first transition zone. However, correspondingly, it leads to a reduction in the lightweight effect of the supporting equipment. Therefore, it is advisable that M3 / ΔT is equal to or slightly exceeds the safety factor K1 of the transition zone, so that the first transition zone has sufficient structural strength and the supporting equipment can be lightweight.

[0193] In conjunction with Examples 1, 4, 5, 6, 7 and 8, as M2 / M5 increases, the lightweight effect of the supporting device is better. However, when M2 / M5 exceeds the safe value range (0.65), the structural strength of the supporting device decreases, resulting in damage to the structural components of the battery pack.

[0194] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A tray device (100), characterized in that, include: The roll-formed disc body (110) has two first edges (111) opposite each other along a first direction, the first edges (111) extending along a second direction, the first direction being perpendicular to the second direction, and a portion of the structure of the first edges (111) protruding along the first direction to form a plurality of lifting parts (112), the plurality of lifting parts (112) being spaced apart along the second direction; The disk body (110) has a plurality of first regions (113) arranged at intervals along the second direction. The hoisting part (112) is located at least in the first region (113). A second region (114) is provided between two adjacent first regions (113). The first region (113) and the second region (114) are connected by a first transition region (115). The thickness T1 of the first region (113) and the thickness T2 of the second region (114) satisfy: T1 > T2.

2. The tray device (100) according to claim 1, characterized in that, The thickness T1 of the first region (113) and the thickness T2 of the second region (114) satisfy: 1 ​​< T1 / T2 ≤ 2.1; and / or, The thickness T1 of the first region (113) satisfies: 1mm ≤ T1 ≤ 1.6mm; and / or, The thickness T2 of the second region (114) satisfies: 0.6mm ≤ T2 ≤ 1mm; and / or, The length M1 of the first region (113) along the second direction satisfies: 134mm ≤ M1 ≤ 154mm; and / or, The length M2 of the second region (114) along the second direction satisfies: 142mm ≤ M2 ≤ 175mm; and / or, The length M3 of the first transition region (115) along the second direction satisfies: 36mm ≤ M3 ≤ 52mm; and / or, The disk body (110) has two second edges (117) opposite each other along the second direction. The second edge (117) and the adjacent first region (113) form a first edge region (118). The thickness of the first edge region (118) is equal to the thickness of the first region (113), and the length M4 of the first edge region (118) along the second direction satisfies: 51mm≤M4≤196mm.

3. The tray device (100) according to claim 1, characterized in that, The hoisting part (112) has a hoisting hole (116) that extends through the thickness direction. The distance M5 between the axes of two adjacent hoisting holes (116) along the second direction and the length M2 of the second region (114) along the second direction satisfy the following: 0.35≤M2 / M5≤0.

65.

4. The tray device (100) according to claim 1, characterized in that, The length M3 of the first transition zone (115) along the second direction and the strength φ of the disk body (110) satisfy: M3≥[(1.15*φ / 30)±3]*(T1-T2).

5. A support device (200), characterized in that, For supporting the battery pack, the supporting device (200) includes: The pallet device (100) according to any one of claims 1-4, wherein the pallet body (110) of the pallet device (100) has a support surface and a bearing surface opposite each other in the thickness direction; Two first arm beams (210) are provided on the support surface, and the two first arm beams (210) are spaced apart along the second direction, defining an installation space for accommodating the battery cell assembly; Two second arm beams (220) are provided on the support surface. The second arm beams (220) extend along the second direction and at least partially overlap with the first edge (111). The second arm beams (220) are provided with a plurality of mounting holes (221) that penetrate along the thickness direction. The mounting holes (221) correspond one-to-one with the lifting holes (116) on the disk body (110). A sleeve (230) is fixedly installed in the mounting hole (221), and the sleeve (230) passes through the lifting hole (116) and is fixedly connected to the disk body (110).

6. The supporting device (200) according to claim 5, characterized in that, The length D1 of the lifting part (112) of the pallet device (100) along the second direction satisfies the following relationship with the outer diameter D2 of the sleeve (230): D1 / D2≥2.

7. The supporting device (200) according to claim 5, characterized in that, The first arm beam (210) is roll-formed, and the first arm beam (210) has a third region (211) and a fourth region (212) arranged at intervals along the first direction, and the third region (211) and the fourth region (212) are connected by a second transition region (213); Wherein, the thickness T3 of the third region (211) and the thickness T4 of the fourth region (212) satisfy: T3 > T4; and / or, the thickness T3 of the third region (211) and the thickness T4 of the fourth region (212) satisfy: 1 ​​< T3 / T4 ≤ 2.1; and / or, The thickness T3 of the third region (211) satisfies: 1mm ≤ T3 ≤ 1.6mm; and / or, The thickness T4 of the fourth region (212) satisfies: 0.6mm ≤ T4 ≤ 1mm; and / or, The length M6 of the third region (211) along the first direction satisfies: 500mm ≤ M6 ≤ 525mm; and / or, The length M7 of the fourth region (212) along the first direction satisfies: 48mm ≤ M7 ≤ 56mm; and / or, The length M8 of the second transition zone (213) along the first direction satisfies: 36mm≤M8≤52mm.

8. The supporting device (200) according to claim 5, characterized in that, The second arm beam (220) is roll-formed. The second arm beam (220) has a plurality of fifth regions (222) arranged at intervals along the second direction. The first region (113) corresponds one-to-one with the fifth region (222). The projection of the first region (113) along the thickness direction is located within the projection of the fifth region (222) along the thickness direction. A sixth region (223) is provided between two adjacent fifth regions (222). The fifth region (222) and the sixth region (223) are connected by a third transition zone (224). The thickness T5 of the fifth region (222) and the thickness T6 of the sixth region (223) satisfy: T5 > T6; and / or, the thickness T5 of the fifth region (222) and the thickness T6 of the sixth region (223) satisfy: 1 ​​< T5 / T6 ≤ 2.1; and / or, The thickness T5 of the fifth region (222) satisfies: 1mm ≤ T5 ≤ 1.6mm; and / or, The thickness T6 of the sixth region (223) satisfies: 0.6mm ≤ T6 ≤ 1mm; and / or, the length M9 of the fifth region (222) along the second direction satisfies: 134mm ≤ M9 ≤ 154mm; and / or, The length M10 of the sixth region (223) along the second direction satisfies: 142mm ≤ M10 ≤ 175mm; and / or, The length M11 of the third transition zone (224) along the second direction satisfies: 36mm ≤ M11 ≤ 52mm; and / or; The second arm beam (220) has two opposing third edges along the second direction, the third edges forming a second edge region (225) with the adjacent fifth region (222), the thickness of the second edge region (225) being equal to the thickness of the fifth region (222), and the length M12 of the second edge region (225) along the second direction satisfying: 51mm≤M12≤196mm.

9. A battery pack, characterized in that, include: The supporting device (200) according to any one of claims 5-8.

10. A method for machining a workpiece, characterized in that, The method comprising: a pallet assembly (100), a first arm beam (210), and a second arm beam (220) suitable for processing the support device (200) according to any one of claims 5-8, the method comprising: Pretreatment of raw materials to be processed; The raw material to be processed is fed into a rolling mill for rolling. The rolling force of the roller pressing equipment is adjusted according to a preset size curve to obtain a rolled part; The rolled part is stamped to obtain the target product.

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