Honeycomb core reinforced bottom guard plate

Abstract

The utility model discloses a honeycomb core reinforced bottom protection plate. The honeycomb core reinforced bottom protection plate comprises a first surface layer, a honeycomb layer, a metal layer and a second surface layer which are sequentially stacked, a first fabric layer is arranged between the first surface layer and the honeycomb layer, a second fabric layer is arranged between the honeycomb layer and the metal layer, the first fabric layer comprises at least one first aramid fiber layer, and the second fabric layer comprises at least one second aramid fiber layer. Thus, the first fabric layer is arranged between the honeycomb layer and the first surface layer, and the second fabric layer is arranged between the honeycomb layer and the metal layer, so that the structural stability of the bottom protection plate can be enhanced, and the heat resistance, flame retardance and impact resistance of the bottom protection plate are improved; due to the network structures in the first fabric layer and the second fabric layer, the laminating capacity of the first fabric layer and the second fabric layer and the adhesive film in the bottom protection plate can be improved, and the interface bonding performance of the plate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of bottom guard plates, in particular to a honeycomb core reinforced bottom guard plate. Background Art

[0002] The power battery pack of new energy vehicles is generally placed on a tray on the vehicle chassis. In order to prevent the battery from being damaged by external forces, a bottom guard plate needs to be added to the bottom of the tray.

[0003] In the prior art, the underbody guard plate is generally an aluminum alloy underbody guard plate, but the cost of aluminum alloy is relatively high, and the aluminum alloy underbody guard plate has lower specific stiffness and specific strength in terms of mechanical properties, resulting in weak NVH performance and fatigue durability, and is easily deformed after collision. When the vehicle has an accident, the current chassis guard plate has almost no flame retardant function, and the heat insulation protection and noise reduction effects are not ideal. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a honeycomb core reinforced bottom guard plate.

[0005] The utility model provides a honeycomb core reinforced bottom guard plate, the honeycomb core reinforced bottom guard plate comprises a first surface layer, a honeycomb layer, a metal layer and a second surface layer which are stacked in sequence;

[0006] A first fabric layer is provided between the first surface layer and the honeycomb layer, and a second fabric layer is provided between the honeycomb layer and the metal layer, wherein the first fabric layer includes at least one first aramid fiber layer, and the second fabric layer includes at least one second aramid fiber layer.

[0007] In some embodiments of the present disclosure, the strength and stiffness of the second aramid fiber layer are greater than the strength and stiffness of the first aramid fiber layer.

[0008] In some embodiments of the present disclosure, the first aramid fiber layer is a non-woven fabric or a plain fabric; and / or,

[0009] The second aramid fiber layer is non-woven fabric or plain fabric.

[0010] In some embodiments of the present disclosure, the first surface layer includes a plurality of first sub-layers stacked together, and a third fabric layer is disposed between at least two adjacent first sub-layers; and / or,

[0011] The second surface layer includes a plurality of second sub-layers stacked together, and a fourth fabric layer is arranged between at least two adjacent second sub-layers.

[0012] In some embodiments of the present disclosure, the third fabric layer includes at least one third aramid fiber layer;

[0013] The fourth fabric layer includes at least one fourth aramid fiber layer.

[0014] In some embodiments of the present disclosure, the first sub-layer is a continuous fiber reinforced thermoplastic composite material layer;

[0015] The second sub-layer is a continuous fiber reinforced thermoplastic composite material layer.

[0016] In some embodiments of the present disclosure, the metal layer includes a steel plate.

[0017] In some embodiments of the present disclosure, the thickness of the first surface layer and the second surface layer are both 1.1-1.3 mm, and the thickness of the metal layer is 0.7-0.9 mm.

[0018] In some embodiments of the present disclosure, the overall thickness of the bottom guard plate is 9.5-10.5 mm.

[0019] In some embodiments of the present disclosure, an identification structure is provided on the first surface layer, and the first surface layer is used to be installed on a side close to the battery pack.

[0020] The honeycomb core reinforced bottom guard plate provided by the utility model has at least the following advantages:

[0021] The honeycomb core reinforced bottom guard plate provided by the utility model has a first fabric layer arranged between the honeycomb layer and the first surface layer, a second fabric layer arranged between the honeycomb layer and the metal layer, at least one first aramid fiber layer is stacked in the first fabric layer, and at least one second aramid fiber layer is stacked in the second fabric layer. By arranging the first aramid fiber layer and the second aramid fiber layer, the structural stability of the bottom guard plate can be greatly enhanced, and the heat resistance, flame retardancy and impact resistance of the bottom guard plate can be improved, so that the bottom guard plate can withstand greater external forces and impacts. At the same time, when the first fabric layer and the second fabric layer are used as interlayers, the network structure in the first fabric layer and the second fabric layer can improve the lamination ability of the first fabric layer and the second fabric layer with the adhesive film in the bottom guard plate, improve the interface bonding performance of the plate, and prevent the first surface layer, the second surface layer and the honeycomb layer from separating. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 A schematic cross-sectional structure diagram of a honeycomb core reinforced bottom guard plate provided by an exemplary embodiment of the utility model;

[0024] Figure 2 A schematic diagram of the cross-sectional structure of the first surface layer in a honeycomb core reinforced bottom guard plate provided by another exemplary embodiment of the utility model;

[0025] Figure 3 A schematic diagram of the cross-sectional structure of the second surface layer in a honeycomb core reinforced bottom guard plate provided in another exemplary embodiment of the present utility model.

[0026] The following are marked in the accompanying drawings:

[0027] 1. First surface layer; 11. First sub-layer; 2. Honeycomb layer; 3. Metal layer; 4. Second surface layer; 41. Second sub-layer; 5. First fabric layer; 6. Second fabric layer; 7. Third fabric layer; 8. Fourth fabric layer. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work are within the protection scope of the utility model.

[0029] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] The power battery pack of new energy vehicles is generally placed on a tray on the vehicle chassis. In order to prevent the battery from being damaged by external forces, a bottom guard plate needs to be added to the bottom of the tray.

[0031] In the prior art, the underbody guard plate is generally an aluminum alloy underbody guard plate, but the cost of aluminum alloy is relatively high, and the aluminum alloy underbody guard plate has lower specific stiffness and specific strength in terms of mechanical properties, resulting in weak NVH performance and fatigue durability, and is easily deformed after collision. When the vehicle has an accident, the current chassis guard plate has almost no flame retardant function, and the heat insulation protection and noise reduction effects are not ideal.

[0032] Combine the following Figure 1 The embodiments of the present utility model are further described.

[0033] In order to solve the above technical problems, the utility model provides a honeycomb core reinforced bottom guard plate, by arranging a first fabric layer between the honeycomb layer and the first surface layer, arranging a second fabric layer between the honeycomb layer and the metal layer, stacking at least one first aramid fiber layer in the first fabric layer, and stacking at least one second aramid fiber layer in the second fabric layer, the first aramid fiber layer and the second aramid fiber layer can greatly enhance the structural stability of the bottom guard plate, improve the heat resistance, flame retardancy and impact resistance of the bottom guard plate, and enable the bottom guard plate to withstand greater external forces and impacts. At the same time, when the first fabric layer and the second fabric layer are used as interlayers, the messy network in the structure of the first fabric layer and the second fabric layer can improve the lamination ability of the first fabric layer and the second fabric layer with the adhesive film in the bottom guard plate, improve the interface bonding performance of the plate, and prevent separation between the first surface layer, the second surface layer and the honeycomb layer.

[0034] An exemplary embodiment of the present disclosure provides a honeycomb core reinforced bottom guard plate, such as Figure 1 As shown, it includes a first surface layer 1, a honeycomb layer 2, a metal layer 3 and a second surface layer 4 which are stacked in sequence, a first fabric layer 5 is provided between the first surface layer 1 and the honeycomb layer 2, and a second fabric layer 6 is provided between the honeycomb layer 2 and the metal layer 3, wherein the first fabric layer 5 includes at least one first aramid fiber layer, and the second fabric layer 6 includes at least one second aramid fiber layer. It should be noted that the first aramid fiber layer and the second aramid fiber layer can be made of aramid 1313 or aramid 1414. It can be understood that the first aramid fiber layer and the second aramid fiber layer can both be made of one of aramid 1313 or aramid 1414, and the first aramid fiber layer and the second aramid fiber layer can also be made of different types. Aramid 1313 is a material with excellent thermal stability, good flame retardancy and good radiation protection. Adding aramid 1313 can effectively improve the flame retardancy of the bottom guard plate. Aramid 1414 is an extremely strong material with good heat resistance and puncture resistance. Using it as the middle layer to strengthen the bottom guard plate can effectively improve the strength, heat resistance, impact resistance, etc. of the bottom guard plate.

[0035] By arranging the honeycomb layer 2 between the first surface layer 1 and the second surface layer 4, a plurality of circular or polygonal through holes are provided inside the honeycomb layer 2, and the pores on at least the surface of the honeycomb layer 2 in contact with the first fabric layer 5 and the second fabric layer 6 are filled with pp adhesive film, the first surface layer 1, the first fabric layer 5, the honeycomb layer 2, the metal layer 3, the second fabric layer 6 and the second surface layer 4 are combined into a whole by the pp adhesive film, the pp adhesive film can not only seal the through holes in the honeycomb layer 2, but also the pp adhesive film after cooling and solidification forms a whole in the plane direction of the honeycomb layer 2, which is beneficial to stress transfer and energy dissipation, and effectively improves the stiffness and pressure bearing capacity of the prepared honeycomb layer 2, so that the prepared vehicle honeycomb layer 2 can meet the requirements of the liquid molding process, and the pp adhesive film connecting the upper and lower sides of the honeycomb layer 2 can be connected into an uninterrupted whole through the through holes, which is beneficial to prevent the layers of the bottom guard plate from being dislocated and delaminated.

[0036] A first fabric layer 5 is arranged between the honeycomb layer 2 and the first surface layer 1, and a second fabric layer 6 is arranged between the honeycomb layer 2 and the metal layer 3. At least one first aramid fiber layer is stacked in the first fabric layer 5, and at least one second aramid fiber layer is stacked in the second fabric layer 6. By arranging the first aramid fiber layer and the second aramid fiber layer, the structural stability of the bottom guard plate can be greatly enhanced, and the heat resistance, flame retardancy and impact resistance of the bottom guard plate can be improved, so that the bottom guard plate can withstand greater external forces and impacts. At the same time, when the first fabric layer 5 and the second fabric layer 6 are used as interlayers, the network structure in the first fabric layer 5 and the second fabric layer 6 can improve the lamination ability of the first fabric layer 5 and the second fabric layer 6 with the adhesive film in the bottom guard plate, improve the interface bonding performance of the plate, and prevent the first surface layer 1, the second surface layer 4 and the honeycomb layer 2 from separating. This is because aramid, as an excellent lightweight material, has excellent impact resistance. When used as a reinforcing layer of the bottom guard plate, the aramid cloth with plain weave and non-woven structure has more pores. During hot pressing, the glue flows and forms many mortise and tenon structures with the irregular fabric surface, which effectively enhances the interlayer bonding type of the material. Especially for aramid non-woven fabrics, the fibers are entangled in disorder, and have strong bonding force on all three axes.

[0037] In some embodiments of the present invention, referring to Figure 1 , the strength and stiffness of the second aramid fiber layer are greater than those of the first aramid fiber layer. Exemplarily, the second aramid fiber layer is arranged on the side close to the metal layer 3. When installing the bottom guard plate, the side close to the metal layer 3 is used to be installed on the side of the vehicle away from the battery pack and close to the ground. Therefore, the second aramid fiber layer can use aramid 1414 with higher strength and stiffness, which enables it to withstand higher tensile and compressive forces, thereby enabling the bottom guard plate to withstand greater external forces and impacts. At the same time, the first aramid fiber layer can use aramid 1313.

[0038] In some embodiments of the present invention, referring to Figure 1 , the first aramid fiber layer is a needle-punched nonwoven fabric or a plain fabric, and the second aramid fiber layer is a nonwoven fabric or a plain fabric. In one embodiment, the first aramid fiber layer is a nonwoven fabric made by needle-punching aramid 1313, and the second aramid fiber layer is a nonwoven fabric made by needle-punching aramid 1313. Of course, in other embodiments, the first aramid fiber layer can also be a plain fabric woven from aramid 1313, or the first aramid fiber layer can also be a nonwoven fabric or a plain fabric prepared from aramid 1414, and the second aramid fiber layer can also be a plain fabric woven from aramid 1414.

[0039] In this way, the structural strength and stability of the bottom guard plate can be enhanced. Both non-woven fabrics and plain weave fabrics are lightweight and flexible materials with good tensile strength and toughness, which can effectively enhance the structural strength and stability of the bottom guard plate. Aramid fiber itself has the characteristics of high strength and high modulus, and the structure of non-woven fabrics or plain weave fabrics can effectively combine the fibers together to form a lightweight and impact-resistant mesh as a whole, thereby improving the overall performance of the bottom guard plate, thereby enabling the bottom guard plate to effectively resist the impact and friction from objects such as gravel and puddles on the road surface, and extending the service life of the bottom guard plate. At the same time, when non-woven fabrics or plain weave fabrics are used as interlayers, the messy network in the non-woven fabric or plain weave fabric structure can improve the lamination ability with the PP film and improve the interface bonding of the bottom guard plate, especially the non-woven fabrics made of aramid needle punching, where the messy fibers are entangled together and have strong bonding strength on all three axes.

[0040] In some embodiments of the present invention, referring to Figure 2 The first surface layer 1 includes a plurality of first sub-layers 11 stacked together, and a third fabric layer 7 is disposed between at least two adjacent first sub-layers 11. Figure 2 The multiple first sub-layers 11 can be laid at different angles, and the third fabric layer 7 is arranged between the first sub-layers 11 of two adjacent layers. By laying at different angles, the multiple first sub-layers 11 can form a staggered structure, which effectively improves the overall strength and stability of the bottom guard plate, thereby enabling the bottom guard plate to better disperse and withstand force when subjected to external impact. Among them, the third fabric layer 7 can be made of non-woven fabric or plain fabric woven from aramid 1313, or non-woven fabric or plain fabric woven from aramid 1414. The third fabric layer 7 is arranged between the first sub-layers 11 of two adjacent layers, which can further enhance the performance of the bottom guard plate, enhance the heat resistance, flame retardancy and impact resistance of the bottom guard plate, thereby improving the service life and safety of the bottom guard plate.

[0041] The second surface layer 4 includes a plurality of second sub-layers 41 stacked together, and a fourth fabric layer 8 is disposed between at least two adjacent second sub-layers 41. Figure 3 The multiple layers of second sub-layers 41 can be laid at different angles, and the fourth fabric layer 8 is arranged between two adjacent layers of the second sub-layers 41. By laying at different angles, the multiple layers of second sub-layers 41 can form a staggered structure, which effectively improves the overall strength and stability of the bottom guard plate, thereby enabling the bottom guard plate to better disperse and withstand forces when subjected to external impact. Among them, the fourth fabric layer 8 can be made of non-woven fabric or plain fabric woven from aramid 1313, or non-woven fabric or plain fabric woven from aramid 1414. The fourth fabric layer 8 is arranged between two adjacent layers of the second sub-layers 41 to further enhance the performance of the bottom guard plate, enhance the heat resistance, flame retardancy and impact resistance of the bottom guard plate, thereby improving the service life and safety of the bottom guard plate.

[0042] In some embodiments of the present invention, referring to Figure 2 and Figure 3 The third fabric layer 7 includes at least one third aramid fiber layer, and the fourth fabric layer 8 includes at least one fourth aramid fiber layer. The third aramid fiber layer and the fourth aramid fiber layer can be made of aramid 1313 or aramid 1414. It can be understood that the third aramid fiber layer and the fourth aramid fiber layer can both be made of non-woven fabric or plain fabric made of one of aramid 1313 or aramid 1414, and the third aramid fiber layer and the fourth aramid fiber layer can also be made of different types. The plain fabric made of aramid is a thinner flexible material. The thickness of a single layer of plain fabric is thicker than that of a single layer of the first sub-layer 11 or the second sub-layer 41. Therefore, when laying, two layers of plain fabric made of aramid can be laid between two adjacent first sub-layers 11 or the second sub-layers 41. The thickness of the non-woven fabric made of aramid needle-punched fibers is greater than that of plain woven fabric. Therefore, when laying the non-woven fabric, a layer of the non-woven fabric made of aramid fibers can be laid between two adjacent first sub-layers 11 or second sub-layers 41 .

[0043] Aramid fiber itself has the characteristics of high strength and high modulus, while the structure of non-woven fabric or plain fabric can effectively combine the fibers together to form a strong whole, improve the overall performance of the bottom guard plate, and then enable the bottom guard plate to effectively resist the impact and friction from objects such as gravel and puddles on the road, and extend the service life of the bottom guard plate. At the same time, when non-woven fabric or plain fabric is used as an interlayer, the messy network in the non-woven fabric or plain fabric structure can improve the lamination ability with the PP film and improve the interface bonding of the bottom guard plate.

[0044] In some embodiments of the present invention, referring to Figure 1, the first sublayer 11 is a continuous fiber reinforced thermoplastic composite material layer, and the second sublayer 41 is a continuous fiber reinforced thermoplastic composite material layer. In this way, the continuous fiber reinforced thermoplastic composite material layer has excellent strength and mechanical properties. The continuous fiber reinforced thermoplastic composite material can better disperse and withstand stress when subjected to external forces, thereby improving the overall strength of the bottom guard plate, which enables the bottom guard plate to operate stably for a long time in various harsh environments. At the same time, the continuous fiber reinforced thermoplastic composite material layer has good environmental performance and can be recycled and reused to reduce pollution to the environment.

[0045] In some embodiments of the present invention, referring to Figure 1 , the metal layer 3 includes a steel plate. Exemplarily, the steel plate of the metal layer 3 may be a DP780 steel plate. In this way, the steel plate has high mechanical properties and can effectively support and protect the underbody guard and key components of the vehicle bottom. In the event of a collision or impact, the steel plate can effectively reduce damage, protect the structural integrity and normal function of the vehicle, and enhance the stability of the underbody guard.

[0046] In some embodiments of the present invention, referring to Figure 1 The thickness of the first surface layer 1 and the second surface layer 4 are both 1.1-1.3 mm, and the thickness of the metal layer 3 is 0.7-0.9 mm. Figure 1 The thickness of the first surface layer 1 and the second surface layer 4 are both 1.2 mm, and the thickness of the metal layer 3 is 0.8 mm. In this way, it can be ensured that when the bottom guard plate is subjected to external impact, the various layers can work together to bear and disperse the impact force, thereby protecting the key components at the bottom of the vehicle. At the same time, it also helps to ensure the flatness and surface quality of the bottom guard plate, improve the overall aesthetics of the product, and reduce the overall weight to achieve lightweight.

[0047] In some embodiments of the present invention, referring to Figure 1 , the overall thickness of the bottom guard plate is 9.5-10.5mm. In this embodiment, the overall thickness of the bottom guard plate is 10mm, which can ensure that the bottom guard plate has sufficient structural strength, effectively resist impact and collision from the road surface, protect the key components of the bottom of the vehicle, and thus improve the bottom protection performance, and also reduce the overall weight to achieve lightweight.

[0048] In some embodiments of the present invention, referring to Figure 1, an identification structure is provided on the first surface layer 1, and the first surface layer 1 is used to be installed on the side close to the battery pack. In this way, by providing the identification structure on the first surface layer 1, the bottom guard plate is easier to identify and locate during installation and use, which can help the staff to quickly and accurately find the bottom guard plate and its installation position, improve the installation efficiency and accuracy, and at the same time, through the identification structure, the specifications, model, production date and other important information of the bottom guard plate can be clearly identified, which is conducive to the subsequent maintenance and management of the vehicle by the staff.

[0049] The contents described above can be implemented individually or in combination in various ways, and these variations are all within the protection scope of the present utility model.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model is described in detail with reference to the above embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the above embodiments, or replace some of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A honeycomb core reinforced bottom guard plate, characterized in that: It comprises a first surface layer, a honeycomb layer, a metal layer and a second surface layer which are stacked in sequence; A first fabric layer is provided between the first surface layer and the honeycomb layer, and a second fabric layer is provided between the honeycomb layer and the metal layer, wherein the first fabric layer includes at least one first aramid fiber layer, and the second fabric layer includes at least one second aramid fiber layer.

2. The honeycomb core reinforced bottom guard plate according to claim 1, characterized in that: The strength and stiffness of the second aramid fiber layer are greater than those of the first aramid fiber layer.

3. The honeycomb core reinforced bottom guard plate according to claim 1, characterized in that: The first aramid fiber layer is a non-woven fabric or a plain fabric; and / or, The second aramid fiber layer is non-woven fabric or plain fabric.

4. The honeycomb core reinforced bottom guard plate according to claim 1, characterized in that: The first surface layer comprises a plurality of first sub-layers stacked together, and a third fabric layer is arranged between at least two adjacent first sub-layers; and / or, The second surface layer includes a plurality of second sub-layers stacked together, and a fourth fabric layer is arranged between at least two adjacent second sub-layers.

5. The honeycomb core reinforced bottom guard plate according to claim 4, characterized in that: The third fabric layer comprises at least one third aramid fiber layer; The fourth fabric layer includes at least one fourth aramid fiber layer.

6. The honeycomb core reinforced bottom guard plate according to claim 4, characterized in that: The first sub-layer is a continuous fiber reinforced thermoplastic composite material layer; The second sub-layer is a continuous fiber reinforced thermoplastic composite material layer.

7. The honeycomb core reinforced bottom guard plate according to claim 1, characterized in that: The metal layer includes a steel plate.

8. The honeycomb core reinforced bottom guard plate according to claim 1, characterized in that: The thickness of the first surface layer and the second surface layer are both 1.1-1.3 mm, and the thickness of the metal layer is 0.7-0.9 mm.

9. The honeycomb core reinforced bottom guard plate according to claim 1, characterized in that: The overall thickness of the bottom guard plate is 9.5-10.5 mm.

10. The honeycomb core reinforced bottom guard plate according to claim 1, characterized in that: The first surface layer is provided with a marking structure, and the first surface layer is used for installation on a side close to the battery pack.

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