A paper packaging box for power battery transportation

Abstract

The application discloses a paper packaging box for power battery transportation and relates to the field of battery packaging and transportation. The paper packaging box comprises a tray body which can be stacked in multiple layers. The tray body is composed of a bottom plate, a pair of first side plates arranged oppositely and a pair of second side plates arranged oppositely. The first side plates and the second side plates are surrounded with the bottom plate to form a placing area. A bottom reinforcing plate is arranged above the bottom plate. A side reinforcing plate is arranged on the sidewall of the first side plate. The second side plate is folded to form a U-shaped structure, and a cavity is formed in the second side plate. An inner core is filled in the cavity. An intermediate partition plate is arranged on the bottom plate. The intermediate partition plate divides the placing area into multiple placing grooves. The bottom reinforcing plate, the side reinforcing plate, the inner core filling, the intermediate partition plate and the supporting cylinder are used for multiple reinforcement design, so that the overall structural strength, the compression resistance and the stability of the packaging box are improved, and the internal power battery can be effectively protected from damage during transportation and stacking.

Description

Technical Field

[0001] This application relates to the field of product transportation packaging technology, and in particular to a paper packaging box for transporting power batteries. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the demand for transporting power batteries has increased dramatically. Due to the heavy weight, high value, and fragility of power batteries, their transport packaging needs to possess high strength, impact resistance, and shockproof performance. Currently, common transport packaging materials on the market include wood, plastic, and paper, among which paper packaging is gradually becoming a research hotspot due to its advantages such as environmental friendliness and low cost. However, ordinary paper packaging has significant shortcomings in load-bearing and cushioning performance, making it difficult to meet the high standards required for transporting power batteries.

[0003] Existing battery packaging boxes are mainly divided into two categories: plastic boxes and paper boxes. Although plastic boxes have a certain structural strength, they are expensive, difficult to degrade naturally, which is not conducive to environmental protection, and subsequent recycling is also difficult. Existing paper boxes are mostly simple single-layer corrugated cardboard boxes, which generally have low structural strength. During transportation, especially when stacked in multiple layers, they are easily deformed or crushed due to pressure, which can damage the batteries inside. They cannot meet the transportation requirements of heavy products such as power batteries that require a high level of protection. Utility Model Content

[0004] In view of the above-mentioned prior art, in order to solve the problems of existing paper packaging boxes using simple single-layer corrugated cardboard boxes with low structural strength and easy to be crushed during use or transportation, this application provides a paper packaging box for power battery transportation.

[0005] This application provides a paper packaging box for transporting power batteries, which adopts the following technical solution: A paper packaging box for transporting power batteries includes a multi-layer stackable pallet body. The pallet body consists of a bottom plate, a pair of opposing first side plates, and a pair of opposing second side plates. The first and second side plates, together with the bottom plate, form a placement area. A bottom reinforcing plate is provided above the bottom plate. Side reinforcing plates are provided on the side walls of the first side plates. The second side plates are folded into a U-shape by folding a piece of paper, creating a cavity inside the second side plate. The cavity is filled with an inner core. A middle partition is provided on the bottom plate, dividing the placement area into multiple placement slots. A pad is provided in each placement slot, with both ends of the pad inserted into the first side plate and the side reinforcing plates. A connecting fold plate is provided on the surface of the pallet body, connecting the first and second side plates.

[0006] By adopting the above technical solutions, the addition of a bottom reinforcing plate to the base plate not only strengthens the load-bearing foundation of the pallet body and prevents deformation and damage to the base plate caused by the weight of the power battery, but also disperses the pressure during stacking, making it suitable for multi-layer stacking transportation scenarios. The first side plate is equipped with a side reinforcing plate, which enhances the lateral compression resistance and reduces the impact of side collisions on the internal battery during transportation. At the same time, the second side plate adopts a "paper folding U-shaped structure + cavity core filling" design. The U-shaped structure itself has natural bending stiffness, and with the core filling, it forms a "sandwich composite structure", which significantly improves the strength and cushioning performance compared to a single cardboard side plate, avoiding the waste of solid cardboard material and achieving a balance of "lightweight + high strength". Finally, the first and second side plates are connected by a "connecting folding plate". Compared with traditional gluing or nailing methods, the folding connection structure is more in line with the characteristics of paper materials. After assembly, the stress at the seam is more even, and it is less likely to detach or fall apart, thus improving the overall structural stability of the packaging box.

[0007] Preferably, the inner core is adhered and fixed to the inner wall of the cavity of the second side plate, and the inner core is made of corrugated cardboard with a folding structure, which is formed by three folds of a single sheet of paper.

[0008] By adopting the above technical solution, the corrugated cardboard itself has the buffering and bending resistance characteristics of the corrugated core layer. Through the folding structure formed by "one sheet in three folds" (such as Z-shaped, U-shaped or stepped shape), a stable support frame can be formed in the cavity, so that the U-shaped cavity of the second side plate is transformed from "hollow state" to "multi-directional support composite structure". This structure can effectively resist lateral compression and bending force, avoid side plate dents or deformation caused by collision and stacking pressure during transportation, and indirectly protect the internal power battery.

[0009] Preferably, the tray body is a rectangular box structure, the bottom reinforcing plate has a first positioning groove for positioning the bottom of the middle partition, and the side reinforcing plate has a second positioning groove for positioning the side end of the middle partition.

[0010] By adopting the above technical solution, the bottom of the middle partition is embedded in the first positioning groove of the bottom reinforcing plate, and the side end is inserted into the second positioning groove of the side reinforcing plate. Through the bidirectional limiting of "bottom + side end", the middle partition and the pallet body form a firm "embedded connection", which can effectively resist longitudinal (up and down) vibration and lateral (left and right) sway during transportation, and prevent the middle partition from shifting, tilting or falling off due to force, ensuring that its separation and limiting function for the power battery is continuously effective.

[0011] Preferably, slots for fixing pads are provided on the side walls of both the first side plate and the side reinforcing plate, and both ends of the pads extend toward the first side plate and are inserted into the slots.

[0012] By adopting the above technical solution, the two ends of the pad are inserted into the slots of the first side plate and the side reinforcing plate, respectively. Through the structure of "two-point support + slot wall wrapping", the pad is firmly locked in the placement slot, preventing the pad from shifting, flipping or falling off due to bumps or sudden braking during transportation. Compared with the pad simply placed in the slot, this insertion fixation can resist the dual forces of longitudinal (up and down) and lateral (left and right), ensuring that the pad is always in the preset position and continuously providing support and limit for the power battery.

[0013] Preferably, the bottom of the first side plate is provided with a groove for connecting two adjacent tray bodies, and the second side plate is provided with a plug for cooperating with the groove, wherein the plug is formed by an inner core protruding through the second side plate.

[0014] By adopting the above technical solution, the groove of the upper pallet body and the insert of the lower pallet body cooperate with each other to achieve longitudinal (up and down) positioning of adjacent pallet bodies through physical interlocking. This avoids displacement and sliding of pallet bodies caused by road bumps, sudden braking or external force collisions after stacking. Compared with stacking methods without positioning, the concave-convex interlocking structure can firmly lock the relative position of the upper and lower pallet bodies, greatly improving the overall stability of multi-layer stacking.

[0015] Preferably, the placement slot is provided with a plurality of support cylinders, and an obstacle avoidance area for picking up and placing batteries is formed between adjacent support cylinders.

[0016] By adopting the above technical solution, the support cylinder has a certain height, which can form a "surrounding multi-point support" for the battery from the bottom up. Combined with the lateral limiting of the placement slot (middle partition + pad), a three-dimensional protective structure of "upper and lower support + left and right limiting" is formed. This prevents the battery from moving up and down in the placement slot and hitting the top or bottom of the pallet during transportation, further reducing the risk of vibration damage. At the same time, the avoidance area between adjacent support cylinders provides ample operating space for fingers or picking tools (such as forklifts and clamps). When placing the battery, the battery position can be accurately located through the avoidance area, avoiding placement deviation caused by an excessively large support surface. When removing the battery, fingers or tools can be inserted into the avoidance area to pinch / grip the battery without having to dig or pry it, greatly reducing the difficulty of picking and placing. This is especially suitable for batch loading and unloading scenarios, improving work efficiency.

[0017] Preferably, a pair of slots for transporting the pallet body are provided on the inner wall of the side reinforcing plate on the first side plate.

[0018] By adopting the above technical solution, a pair of snap-fit ​​grooves on the inner wall of the side reinforcing plate provide a clear force application position for manual handling or tool-assisted handling. When handling manually, both hands can be accurately snapped into the grooves, and the pallet body can be easily lifted with the support of the groove wall, avoiding the handling difficulties caused by the smooth surface of the pallet and the lack of leverage points.

[0019] Preferably, the two intermediate partitions on the adjacent tray bodies are arranged in a cross shape.

[0020] By adopting the above technical solution, the middle partition of the upper pallet body and the middle partition of the lower pallet body cross each other to form a "cross block" in the vertical direction, which can effectively limit the upward movement of the power battery in the lower pallet body. At the same time, the battery in the upper pallet body will also be indirectly supported by the lower cross partition, reducing the risk of downward movement, forming a three-dimensional protection of "upper and lower bidirectional limit", further reducing vibration damage.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. Through multiple reinforcement designs such as bottom reinforcing plate, side reinforcing plate, inner core filling, middle partition plate, and support cylinder, the core pain points of "heavy load, collision prevention, and displacement prevention" in the transportation of power batteries are solved, while also taking into account transportation efficiency and environmental protection requirements. The overall structural strength, pressure resistance and stability of the packaging box are significantly improved, which can effectively protect the internal power batteries from damage during transportation and stacking. 2. The core design, through a combination of "structural reinforcement + material optimization + cushioning upgrade + process adaptation", significantly improves the strength and protection of the second side panel without increasing too much cost and weight. At the same time, it conforms to the environmental protection and easy processing characteristics of paper packaging, further improving the practicality and economy of the power battery transport packaging box. 3. This application uses all paper materials (corrugated cardboard), which is low in cost, fully recyclable and biodegradable, and meets green environmental protection requirements. At the same time, it adopts a unique stacking design with interlocking blocks and slots, as well as a cross-shaped layout with intermediate partitions, which makes the connection stable when stacking multiple layers, not easy to shift, and improves the space utilization and safety of storage and transportation. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a paper packaging box used for transporting power batteries; Figure 2 This is a schematic diagram of the tray body structure; Figure 3 This is a partial schematic diagram of the internal structure of the second side panel; Figure 4 This is a schematic diagram of the internal structure of the tray body; Figure 5 This is a diagram illustrating the interaction between two adjacent trays; Figure 6 This is a bottom sectional view of the tray body.

[0023] Reference numerals: 100, pallet body; 110, bottom plate; 111, bottom reinforcing plate; 111-1, first positioning groove; 120, first side plate; 121, side reinforcing plate; 121-1, second positioning groove; 121-2, slot; 121-3, embedding groove; 121-4, snap-fit ​​groove; 130, second side plate; 131, cavity; 132, inner core; 132-1, insert block; 140, placement area; 141, placement groove; 150, middle partition plate; 160, pad block; 170, connecting folding plate; 180, support cylinder; 190, clearance area. Detailed Implementation

[0024] The following is in conjunction with the appendix Figure 1 - Appendix Figure 6 This application will be described in further detail.

[0025] This application discloses a paper packaging box for transporting power batteries.

[0026] Reference Figure 1 , Figure 2 and Figure 3 A paper packaging box for transporting power batteries is rectangular in shape and made entirely of corrugated cardboard. The paper packaging box includes a pallet body 100, which is composed of a bottom plate 110, a connecting folding plate 170, a pair of opposing first side plates 120, and a pair of opposing second side plates 130. The pallet body 100 is formed by bending the first side plates 120, the second side plates 130, and the bottom plate 110 together through the connecting folding plate 170. The first side plates 120, the second side plates 130, and the bottom plate 110 together form a placement area 140 with an open top. Meanwhile, a bottom reinforcing plate 111 is fixedly connected to the upper surface of the base plate 110 by an adhesive layer. The addition of the bottom reinforcing plate 111 to the base plate 110 not only strengthens the load-bearing foundation of the pallet body 100 and prevents the base plate 110 from deforming or breaking due to the weight of the power battery, but also disperses the pressure during stacking, thereby significantly increasing the load-bearing capacity and bending strength of the bottom of the pallet body 100. Side reinforcing plates 121 are fixedly connected to the inner walls of a pair of first side plates 120 by adhesive, so that the first side plates 120 are equipped with side reinforcing plates 121, which enhances the lateral compression resistance, reduces the impact of side collisions on the internal battery during transportation, and further strengthens the resistance of the first side plates 120 to external impacts and internal pressure, reducing damage to the first side plates 120. A pair of second side panels 130 are cleverly folded from corrugated cardboard into a U-shape using a three-fold process, creating a cavity 131 inside the second side panel 130. The cavity 131 is filled with an inner core 132. The inner core 132 is folded and filled into the second side panel 130 using a three-fold process from corrugated cardboard. The inner core 132 is fixed to the inner wall of the second side panel 130 with adhesive. By filling the inner core 132, the second side panel 130 adopts a design of "paper folding U-shaped structure + cavity 131 and inner core 132 filling". The U-shaped structure itself has natural bending stiffness. When combined with the inner core 132 filling, it forms a "sandwich composite structure", which significantly improves the strength and cushioning performance compared to a single cardboard side panel. At the same time, it avoids the material waste of solid cardboard and achieves a balance of "lightweight + high strength". A middle partition 150 is provided at the center of the placement area 140 on the pallet body 100. The two ends of the middle partition 150 are snapped onto the first side plate 120 and the side reinforcing plate 121, so that the middle partition 150 divides the placement area 140 into multiple independent placement slots 141, realizing the "independent positioning" of a single power battery and avoiding friction and collision between batteries during transportation. Multiple pads 160 are provided in the placement slot 141. Both ends of the pads 160 extend towards the side reinforcing plate 121, making the length of the pads 160 greater than the length of the second side plate 130. Both ends of the pads 160 are inserted into the side reinforcing plate 121. The power battery is placed on the pads 160, avoiding direct contact with the bottom reinforcing plate 111. The length direction of the pads 160 provides good stability. The insertion and cooperation between the pads 160 and the side plate and the side reinforcing plate 121 makes the limiting structure more robust. Even in extreme transportation conditions such as sudden braking and bumps, the battery will not shift in the placement slot 141.

[0027] Through the above solution, the pallet body 100, reinforcing components, pads 160, and connecting folding plates 170 are all made of paper materials, without metal, plastic, or other difficult-to-degrade components. They are recyclable, easily degradable, and meet environmental protection policy requirements, reducing pollution from transportation waste. Furthermore, through multiple reinforcement designs such as the bottom reinforcing plate 111, side reinforcing plates 121, inner core filling 132, middle partition 150, and support cylinder 180, this solution not only addresses the core pain points of "heavy load, collision prevention, and displacement prevention" in the transportation of power batteries, but also takes into account both transportation efficiency and environmental protection requirements.

[0028] refer to Figure 4The upper surface of the bottom reinforcing plate 111 is provided with a first positioning groove 111-1 for locking and fixing the bottom of the middle partition plate 150. The side reinforcing plates 121 on both sides are provided with a pair of second positioning grooves 121-1, which are used to lock and fix the two side ends of the middle partition plate 150. Through the cooperation of the middle partition plate 150 with the first positioning groove 111-1 and the second positioning groove 121-1, the middle partition plate 150 is firmly and vertically installed in the center of the placement area 140. At the same time, after the middle partition plate 150 is rigidly connected to the bottom reinforcing plate 111 and the side reinforcing plate 121 through the first positioning groove 111-1 and the second positioning groove 121-1 respectively, it is equivalent to forming a "lateral support skeleton" inside the pallet. It forms a mutually reinforcing whole with the rectangular box-shaped outer structure first side plate 120 and second side plate 130. This synergistic effect can further improve the torsional resistance of the pallet, especially when multiple layers are stacked, it can reduce the overall deformation caused by uneven force.

[0029] refer to Figure 4 Multiple slots 121-2 are provided on the side walls of the first side plate 120 and the side reinforcing plate 121. The slots 121-2 are used to fix the pad 160. Both ends of the pad 160 are inserted into the slots 121-2, so that the size of the slots 121-2 can be precisely matched with the ends of the pad 160. After insertion, the pad 160 fits tightly against the wall of the slots 121-2. When the battery squeezes the pad 160 or external impact force is transmitted to the pad 160, the force can be quickly distributed to the first side plate 120 and the side reinforcing plate 121 through the slots 121-2, so as to avoid excessive local stress on the pad 160, which may cause deformation or breakage, and extend the service life of the pad 160.

[0030] refer to Figure 4 and Figure 5 To further enhance the vertical compressive strength of the packaging box, especially its ability to resist the weight of upper layers when stacked in multiple layers, a cylindrical support tube 180 is provided at each of the four corners of each placement slot 141, namely the right-angle area enclosed by the first side plate 120, the second side plate 130, and the middle partition 150. The support tube 180 is made of corrugated cardboard and is firmly bonded to the inner wall of the adjacent first side plate 120, the inner wall of the second side plate 130, and the side wall of the middle partition 150 by adhesive. These support tubes 180, like pillars, provide crucial vertical support for the entire packaging box. A clearance area 190142 is naturally formed between two adjacent support tubes 180, making it convenient for operators to reach in and remove batteries.

[0031] A pair of latching grooves 121-4 for transporting the pallet body 100 are provided on the inner wall of the side reinforcing plate 121 on the first side plate 120. The pair of latching grooves 121-4 on the inner wall of the side reinforcing plate 121 provide a clear force application position for manual or tool-assisted transport. When transporting manually, both hands can be accurately latched into the grooves, and the pallet body 100 can be easily lifted with the support of the groove wall, avoiding the transport difficulties caused by the smooth surface of the pallet and the lack of leverage points.

[0032] refer to Figure 4 , Figure 5 , Figure 6 Two insertion holes are provided at the bottom of the second side plate 130. The inner core 132 forms an upwardly protruding insertion block 132-1 at the corresponding position. The top of the insertion block 132-1 passes through the insertion hole and is exposed above the second side plate 13013. The bottom of the side reinforcing plate 121 has a groove 121-3 that mates with the insertion block 132-1. This allows two adjacent pallet bodies 100 to connect via the groove 121-3 and the insertion block 132-1. During stacking, simply align the groove 121-3 of the upper pallet with the insertion block 132-1 of the lower pallet and place it down for precise engagement. No strapping, wrapping film, or other auxiliary fasteners are needed, significantly simplifying the multi-layer stacking process. Workers can quickly complete the stacking without specialized skills, improving loading and unloading efficiency.

[0033] The two intermediate partitions 150 on adjacent pallet bodies 100 are arranged in a cross shape, so that the intermediate partitions 150 of the upper pallet body 100 and the intermediate partitions 150 of the lower pallet body 100 cross each other and form a "cross barrier" in the vertical direction. This can effectively limit the upward movement of the power battery in the lower pallet body 100. At the same time, the battery in the upper pallet body 100 is also indirectly supported by the lower cross partition, reducing the risk of downward movement. This forms a three-dimensional protection with "two-way upper and lower limit", further reducing vibration damage.

[0034] Meanwhile, the middle partition 150 in this application can also be designed as a cross-shaped structure. The middle partition 150 is formed by two corrugated cardboard strips with grooves cut in the middle and then interlocked to form a cross shape. In this way, the placement area 140 of the single-layer packaging box is divided into four independent placement slots 141. Each placement slot 141 is also provided with a support tube 180 at the corner. This design is suitable for situations where more or smaller batteries need to be placed separately. When stacking multiple layers, the cross-shaped partitions of the upper and lower packaging boxes can also be staggered and intersected to achieve the best stability effect.

[0035] The inner core 132 filling the cavity 131 of the second side plate 130 can be a solid block structure made of multiple layers of corrugated cardboard sheets stacked and glued together. It is not necessarily the folded U-shaped structure in this application. This solid filling method can provide extremely high compressive strength and is suitable for transporting power battery units with particularly large weights.

[0036] The implementation principle of this application embodiment is as follows: In implementation, when the cardboard box is transported, the bottom plate 110, the first side plate 120 and the second side plate 130 on the pallet body 100 are laid flat and stacked for transport, so that the side reinforcing plate 121 on the first side plate 120 separates the two adjacent flat pallet bodies 100, so as to avoid the two adjacent flat pallet bodies 100 being tightly attached and inconvenient for users to separate them.

[0037] When transporting and packaging power batteries, the first side plate 120 and the second side plate 130 are connected to the bottom plate 110 through the connecting folding plate 170 to form a placement space, forming a pallet body 100. Then, the middle partition plate 150 is inserted into the first positioning groove 111-1 and the second positioning groove 121-1 to stabilize the pallet body 100. The pad 160 is placed in the placement groove 141, and both ends of the pad 160 are inserted into the side reinforcing plate 121 and the slots 121-2 on the first side plate 120. Then, the power battery is placed on the pad 160, so that the support cylinder 180 and the pad 160 limit and buffer the battery.

[0038] When multiple layers need to be stacked for storage or transportation, place the second identical packaging box on top of the first packaging box. When placing it, ensure that the two slots 121-3 at the bottom of the bottom plate 110 of the upper packaging box are precisely aligned with the four protruding inserts 132-1 on the two second side plates 130 of the lower packaging box. Then gently lower it, and the slots 121-3 of the upper packaging box will fit into the inserts 132-1 of the lower packaging box, forming effective positioning and interlocking to prevent horizontal sliding between the upper and lower layers. At this time, the middle partition 150 of the upper packaging box and the middle partition 150 of the lower packaging box are arranged in a cross shape in space. This cross arrangement makes the force on the stacked body more uniform, the overall stability higher, and further enhances the resistance to pressure and torsion, thereby making the battery transportation more stable.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A paper packaging box for transporting power batteries, comprising a multi-layer stackable pallet body (100), the pallet body (100) comprising a base plate (110), a pair of opposing first side plates (120) and a pair of opposing second side plates (130), wherein the first side plates (120) and the second side plates (130) enclose the base plate (110) to form a placement area (140), characterized in that, A bottom reinforcing plate (111) is provided above the bottom plate (110), a side reinforcing plate (121) is provided on the side wall of the first side plate (120), the second side plate (130) is formed into a U-shaped structure by folding a piece of paper, and a cavity (131) is formed inside the second side plate (130), the cavity (131) is filled with an inner core (132), a middle partition plate (150) is provided on the bottom plate (110), the middle partition plate (150) divides the placement area (140) into multiple placement slots (141), a pad (160) is provided in the placement slot (141), and both ends of the pad (160) are inserted into the first side plate (120) and the side reinforcing plate (121), a connecting folding plate (170) is provided on the surface of the tray body (100), and the first side plate (120) and the second side plate (130) are connected by the connecting folding plate (170).

2. The paper packaging box for transporting power batteries according to claim 1, characterized in that, The inner core (132) is adhered and fixed to the inner wall of the cavity (131) of the second side plate (130). The inner core (132) is made of corrugated cardboard and has a folding structure, which is formed by three folds of a single sheet.

3. The paper packaging box for transporting power batteries according to claim 1, characterized in that, The pallet body (100) is a rectangular box structure. The bottom reinforcing plate (111) is provided with a first positioning groove (111-1) for positioning the bottom of the middle partition (150), and the side reinforcing plate (121) is provided with a second positioning groove (121-1) for positioning the side end of the middle partition (150).

4. The paper packaging box for transporting power batteries according to claim 1, characterized in that, The first side plate (120) and the side reinforcement plate (121) are provided with slots (121-2) for fixing the pad (160). Both ends of the pad (160) extend toward the first side plate (120) and are inserted into the slots (121-2).

5. A paper packaging box for transporting power batteries according to claim 1, characterized in that, The bottom of the first side plate (120) is provided with a groove (121-3) for connecting two adjacent pallet bodies (100), and the second side plate (130) is provided with a plug (132-1) that cooperates with the groove (121-3). The plug (132-1) has an inner core (132) that protrudes through the second side plate (130).

6. A paper packaging box for transporting power batteries according to claim 1, characterized in that, The placement slot (141) is provided with a plurality of support cylinders (180), and a clearance area (190) for taking out and placing batteries is formed between adjacent support cylinders (180).

7. A paper packaging box for transporting power batteries according to claim 1, characterized in that, A pair of slots (121-4) for transporting the pallet body (100) are provided on the inner wall of the side reinforcing plate (121) on the first side plate (120).

8. A paper packaging box for transporting power batteries according to claim 1, characterized in that, The two intermediate partitions (150) on adjacent tray bodies (100) are arranged in a cross shape.

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