New energy vehicle snowflake layer level polyhedral thin-walled energy absorption pipe structure

Abstract

The application discloses a new energy automobile snowflake-imitating hierarchical multi-cell thin-walled energy-absorbing pipe structure, which comprises a first multi-cell thin-walled energy-absorbing pipe structure, wherein the first multi-cell thin-walled energy-absorbing pipe structure comprises an outer thin-walled pipe and an inner multi-cell thin-walled energy-absorbing structure arranged in the outer thin-walled pipe; the inner multi-cell thin-walled energy-absorbing structure comprises a plurality of arranged single-cell thin-walled energy-absorbing structures; each single-cell thin-walled energy-absorbing structure comprises a hollow small regular hexagonal prism, a large regular hexagonal prism and a connecting rib plate; the central axis of the large regular hexagonal prism and the small regular hexagonal prism is coincident, the side surfaces of the large regular hexagonal prism and the small regular hexagonal prism correspond to each other and are parallel; the connecting rib plate is connected between the corresponding side edges of the large regular hexagonal prism and the small regular hexagonal prism; and each side surface of the large regular hexagonal prism is provided with an inwardly recessed groove. The snowflake-imitating hierarchical multi-cell thin-walled energy-absorbing pipe structure has the advantages of high specific energy absorption, high pressure crushing force efficiency and good deformation mode and can meet the anti-collision requirements of new energy automobiles.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle component technology, specifically to a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles. Background Technology

[0002] The energy-absorbing structure of the front compartment of a car is of great significance to vehicle collision safety. During a frontal collision, the front longitudinal beams and energy-absorbing boxes absorb more than half of the total collision energy. Moreover, the deformation mode and energy absorption characteristics of these two energy-absorbing structures have a decisive influence on the transmission path of the collision force and the acceleration response during the collision. Therefore, with the increasing emphasis on vehicle collision safety and vehicle lightweighting, the design of such energy-absorbing structures has become a key technology for major automobile manufacturers and research institutes.

[0003] Existing energy-absorbing structures mainly include single-cell square energy-absorbing structures, circular energy-absorbing structures, cap-shaped energy-absorbing structures, and polygonal energy-absorbing structures. These structures are primarily used in gasoline-powered vehicles. With the development of modern new energy technologies, new energy vehicles are gradually gaining acceptance. The requirements for energy-absorbing structures in new energy vehicles differ somewhat from those in gasoline-powered vehicles. Due to the unique characteristics of new energy batteries, the collision energy absorption space is smaller, necessitating better collision protection performance in new energy vehicles to effectively protect both the batteries and occupants.

[0004] Existing energy-absorbing structures cannot meet the needs of new energy vehicles, and they typically cannot meet the requirements of high specific energy absorption (SEA), high pressure collapsing efficiency (CFE), and good deformation mode. Summary of the Invention

[0005] The purpose of this invention is to overcome the above-mentioned problems and provide a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles. This snowflake-like layered multi-cell thin-walled energy-absorbing tube structure has advantages such as high specific energy absorption (SEA), high pressure crushing efficiency (CFE), and good deformation mode, which can meet the collision protection requirements of new energy vehicles.

[0006] The objective of this invention is achieved through the following technical solution:

[0007] A snowflake-inspired layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles includes a first multi-cell thin-walled energy-absorbing tube structure. The first multi-cell thin-walled energy-absorbing tube structure comprises an outer thin-walled tube and an inner multi-cell thin-walled energy-absorbing structure disposed within the outer thin-walled tube.

[0008] The inner multi-cell thin-walled energy-absorbing structure includes multiple arranged single-cell thin-walled energy-absorbing structures. Each single-cell thin-walled energy-absorbing structure includes a hollow small regular hexagonal prism, a hollow large regular hexagonal prism fitted outside the small regular hexagonal prism, and a connecting rib plate disposed between the small and large regular hexagonal prisms. The central axes of the large and small regular hexagonal prisms coincide, and the side surfaces of the large and small regular hexagonal prisms correspond to each other and are parallel. The connecting rib plate connects the corresponding side edges of the large and small regular hexagonal prisms. Each side surface of the large regular hexagonal prism is provided with an inwardly recessed groove.

[0009] The working principle of the above-mentioned snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles is as follows:

[0010] The single-cell thin-walled energy-absorbing structure evolved from the snowflake structure, thus mimicking a snowflake. This snowflake-like structure exhibits excellent energy absorption. When a new energy vehicle collides, the snowflake-like layered multi-cell thin-walled energy-absorbing tube structure experiences a certain impact force. This force acts on the large hexagonal prisms of each single-cell thin-walled energy-absorbing structure. After being buffered and transitioned by connecting ribs and the gaps between the large and small hexagonal prisms, the impact force is effectively reduced, thereby mitigating the impact on critical structures of the new energy vehicle and effectively protecting the battery and occupants. The overall structure possesses excellent collision safety performance, exhibiting a high specific energy absorption area (SEA), high pressure collapse efficiency (CFE), and a favorable deformation mode. This effectively coordinates the contradictions between the high specific energy absorption area (SEA), high pressure collapse efficiency (CFE), and favorable deformation mode in the collision safety design process.

[0011] In a preferred embodiment of the present invention, the outer thin-walled tube is a regular hexagonal thin-walled tube, and the corresponding sides of the regular hexagonal thin-walled tube correspond to and are parallel to those of the smaller regular hexagonal prism. By setting the regular hexagonal thin-walled tube, the outer thin-walled tube, the smaller regular hexagonal prism, and the larger regular hexagonal prism are all hexagonal, which can improve the stability of the structure and thus improve the impact resistance.

[0012] Preferably, the number of unit-cell thin-walled energy-absorbing structures is seven. These seven structures consist of one central unit-cell thin-walled energy-absorbing structure and six peripheral unit-cell thin-walled energy-absorbing structures arranged around the central structure. The six peripheral structures are distributed circumferentially. Adjacent unit-cell thin-walled energy-absorbing structures are interconnected, and the peripheral structures are connected to the outer thin-walled tube. In this structure, adjacent unit-cell thin-walled energy-absorbing structures are interconnected, meaning that two adjacent peripheral structures are connected, and adjacent peripheral structures are connected to the central structure. By setting seven unit-cell thin-walled energy-absorbing structures and distributing the six peripheral structures around the central structure, a honeycomb-like structure is formed, providing excellent energy absorption and impact resistance.

[0013] Preferably, the first multi-cell thin-walled energy-absorbing tube structure further includes an intermediate energy-absorbing structure disposed between the outer thin-walled tube and the surrounding single-cell thin-walled energy-absorbing structures; the intermediate energy-absorbing structure includes a first energy-absorbing structure disposed between the side edge of the outer thin-walled tube and the surrounding single-cell thin-walled energy-absorbing structures, and a second energy-absorbing structure disposed between the inner sidewall of the outer thin-walled tube and the surrounding single-cell thin-walled energy-absorbing structures. By providing the intermediate energy-absorbing structure, on the one hand, it is convenient to realize the connection between the outer thin-walled tube and the surrounding single-cell thin-walled energy-absorbing structures, and on the other hand, it can improve the energy absorption effect.

[0014] Preferably, adjacent thin-walled unit cell energy-absorbing structures are connected side-to-side. That is, the sides of the corresponding large regular hexagonal prisms between two adjacent peripheral thin-walled unit cell energy-absorbing structures are interconnected, and the sides of the corresponding large regular hexagonal prisms between adjacent peripheral thin-walled unit cell energy-absorbing structures and the intermediate thin-walled unit cell energy-absorbing structure are interconnected. Since the intermediate thin-walled unit cell energy-absorbing structure has six sides, each of these six sides connects to one side of the large regular hexagonal prism of each peripheral thin-walled unit cell energy-absorbing structure. After the adjacent thin-walled unit cell energy-absorbing structures are connected side-to-side, the grooves on the sides of two opposing large regular hexagonal prisms will form a large groove. By placing the thin-walled unit cell energy-absorbing structures inside the outer thin-walled tube, and through the regular arrangement of the thin-walled unit cell energy-absorbing structures and the side-to-side connection, the limited space can be utilized to the maximum extent. Furthermore, the load can be distributed, the stability and compressive strength of the structure can be enhanced, the problem of excessive local stress can be reduced, and the safety of the structure can be improved.

[0015] Preferably, adjacent thin-walled unit cell energy-absorbing structures are connected by side-to-side connection. That is, the side edges of the corresponding large regular hexagonal prisms between two adjacent peripheral thin-walled unit cell energy-absorbing structures are interconnected, and the side edges of the corresponding large regular hexagonal prisms between adjacent peripheral thin-walled unit cell energy-absorbing structures and the intermediate thin-walled unit cell energy-absorbing structure are interconnected. Since the intermediate thin-walled unit cell energy-absorbing structure has six side edges, each of these six side edges connects to one side edge of the large regular hexagonal prism of each peripheral thin-walled unit cell energy-absorbing structure. After the adjacent thin-walled unit cell energy-absorbing structures are connected by side-to-side connection, the sides of the three interconnected large regular hexagonal prisms form triangular channels, which communicate with the grooves on the corresponding sides. Using a side-to-side connection increases the void density between the thin-walled unit cell energy-absorbing structures, reducing structural weight while maintaining stability and compressive strength.

[0016] Preferably, the first energy-absorbing structure is the single-cell thin-walled energy-absorbing structure, and the second energy-absorbing structure is half of the single-cell thin-walled energy-absorbing structure. In the above structure, the first energy-absorbing structure is identical to the single-cell thin-walled energy-absorbing structure, and the second energy-absorbing structure is half of the single-cell thin-walled energy-absorbing structure. This facilitates the connection between the first energy-absorbing structure, the second energy-absorbing structure, the outer thin-walled tube, and the surrounding single-cell thin-walled energy-absorbing structures, making the structure more compact and improving the energy absorption effect. The sides of the corresponding large regular hexagonal prisms between adjacent first energy-absorbing structures and surrounding single-cell thin-walled energy-absorbing structures are interconnected; the sides of the corresponding large regular hexagonal prisms between adjacent second energy-absorbing structures and surrounding single-cell thin-walled energy-absorbing structures are interconnected; and the inner wall of the outer thin-walled tube is interconnected with the side of the large regular hexagonal prism of the first energy-absorbing structure.

[0017] Preferably, the first energy-absorbing structure is one-third of the single-cell thin-walled energy-absorbing structure, and the second energy-absorbing structure is one-half of the single-cell thin-walled energy-absorbing structure. The purpose of this structure is to facilitate the connection between the first and second energy-absorbing structures, the outer thin-walled tube, and the surrounding single-cell thin-walled energy-absorbing structures, making the structure more compact and improving the energy absorption effect. The lateral edges of the corresponding large regular hexagonal prisms between adjacent first energy-absorbing structures and surrounding single-cell thin-walled energy-absorbing structures are interconnected, and the lateral edges of the corresponding large regular hexagonal prisms between adjacent second energy-absorbing structures and surrounding single-cell thin-walled energy-absorbing structures are also interconnected.

[0018] Preferably, the first energy-absorbing structure is a hollow large regular hexagonal prism, and the second energy-absorbing structure is half of the hollow large regular hexagonal prism. This structure, employing a combination of a single-cell thin-walled energy-absorbing structure and a large regular hexagonal prism as the outermost layer of the single-cell thin-walled energy-absorbing structure, reduces the overall structural mass while maintaining sufficient stability and compressive strength. This allows the structure to absorb most of the impact energy, providing cushioning and protection against impact, reducing damage, lowering maintenance costs, and increasing service life.

[0019] Preferably, the snowflake-like layered multi-cell thin-walled energy absorber structure further includes a second multi-cell thin-walled energy absorber structure, wherein the first multi-cell thin-walled energy absorber structure and the second multi-cell thin-walled energy absorber structure are connected vertically to each other; the other structures of the second multi-cell thin-walled energy absorber structure are the same as those of the first multi-cell thin-walled energy absorber structure, except that the second multi-cell thin-walled energy absorber structure does not include small regular hexagonal prisms and connecting ribs. In the above structure, the second multi-cell thin-walled energy-absorbing tube structure retains only the large regular hexagonal prism, that is, it retains the outer layer structure of the single-cell thin-walled energy-absorbing structure. The outer layer structure of the single-cell thin-walled energy-absorbing structure is used as the basic unit and filled into the outer thin-walled tube in an array. The first and second multi-cell thin-walled energy-absorbing tube structures have excellent performance through a series connection. The second multi-cell thin-walled energy-absorbing tube structure is located on top and can provide good buffering effect when subjected to impact, so as not to cause a large initial peak force. The first multi-cell thin-walled energy-absorbing tube structure below can provide good rigidity, which can both prevent passengers from being seriously injured and ensure the overall load-bearing capacity of the structure.

[0020] Preferably, the snowflake-like layered multi-cell thin-walled energy-absorbing tube structure is formed by 3D printing from 316L stainless steel powder. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure has a regular shape, is easy to process through 3D printing, and uses lightweight stainless steel, resulting in a significant reduction in weight compared to traditional high-strength steel structures. This facilitates the lightweighting of new energy vehicle bodies and effectively reduces energy consumption.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure of this invention, by setting multiple single-cell thin-walled energy-absorbing structures, enables the overall structure to have good collision safety performance, with high specific energy absorption SEA, high pressure crushing efficiency CFE, and good deformation mode; thus, it can well coordinate the contradiction between high specific energy absorption SEA, high pressure crushing efficiency CFE, and good deformation mode in the collision safety design process; and can meet the collision protection requirements of new energy vehicles. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of the first specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0024] Figure 2 This is a top view of the first specific embodiment of a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0025] Figure 3This is a top view of a single-cell thin-walled energy-absorbing structure, representing the first specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0026] Figure 4 This is a three-dimensional structural diagram of a second specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0027] Figure 5 This is a top view of a second specific embodiment of a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0028] Figure 6 This is a three-dimensional structural schematic diagram of a third specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0029] Figure 7 This is a top view of the third specific embodiment of a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0030] Figure 8 This is a top view of a single-cell thin-walled energy-absorbing structure, representing a third specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to the present invention.

[0031] Figure 9 This is a three-dimensional structural diagram of the fourth specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in this invention.

[0032] Figure 10 This is a top view of the fourth specific embodiment of a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in this invention.

[0033] Figure 11 This is a three-dimensional structural schematic diagram of the fifth specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in this invention.

[0034] Figure 12 This is a top view of the fifth specific embodiment of a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in this invention.

[0035] Figure 13 This is a three-dimensional structural diagram of the sixth specific embodiment of a snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in this invention.

[0036] Figure 14 This is a three-dimensional structural schematic diagram from another perspective of the sixth specific embodiment of the snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in this invention.

[0037] Figure 15 This is a cross-sectional view of the sixth specific embodiment of a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in this invention.

[0038] Figure 16 This is a cross-sectional view of the second multi-cell thin-walled energy-absorbing tube structure, which is the sixth specific embodiment of a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in the invention.

[0039] Figure 17 This is a schematic diagram of energy-absorbing structures of unit cells with different shapes in the prior art.

[0040] Figure 18 The evaluation results of energy absorption parameters for energy-absorbing structures of different shapes of unit cells in the prior art.

[0041] Figure 19 The evaluation results of energy absorption parameters of the snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in Examples 1-6 of this invention.

[0042] Figure 20 This is a simulated deformation process diagram of the snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in Embodiment 1 of the present invention.

[0043] Figure 21 This is a simulated deformation process diagram of the snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in Embodiment 2 of the present invention.

[0044] Figure 22 This is a simulated deformation process diagram of the snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in Embodiment 3 of the present invention.

[0045] Figure 23 This is a simulated deformation process diagram of the snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in Embodiment 4 of the present invention.

[0046] Figure 24 This is a simulated deformation process diagram of the snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in Embodiment 5 of the present invention.

[0047] Figure 25 This is a simulated deformation process diagram of the snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles in Embodiment 6 of the present invention.

[0048] Figure 26 This is the axial crushing load displacement curve of the snowflake-like layered multicellular thin-walled energy-absorbing tube structure in this invention.

[0049] Figure 27 This is the energy absorption curve of the snowflake-like layered multicellular thin-walled energy absorber structure in this invention. Detailed Implementation

[0050] To enable those skilled in the art to fully understand the technical solutions of the present invention, the present invention will be further described below in conjunction with embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0051] Example 1

[0052] See Figures 1-3 This embodiment discloses a snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles, including a first multi-cell thin-walled energy-absorbing tube structure 100. The first multi-cell thin-walled energy-absorbing tube structure 100 includes an outer thin-walled tube 1 and an inner multi-cell thin-walled energy-absorbing structure disposed within the outer thin-walled tube 1.

[0053] See Figures 1-3 The inner multi-cell thin-walled energy-absorbing structure includes multiple arranged single-cell thin-walled energy-absorbing structures 2. Each single-cell thin-walled energy-absorbing structure 2 includes a hollow small regular hexagonal prism 21, a hollow large regular hexagonal prism 22 fitted outside the small regular hexagonal prism 21, and a connecting rib 23 disposed between the small regular hexagonal prism 21 and the large regular hexagonal prism 22. The central axes of the large regular hexagonal prism 22 and the small regular hexagonal prism 21 coincide, and the side surfaces of the large regular hexagonal prism 22 and the small regular hexagonal prism 21 correspond to each other and are parallel. The connecting rib 23 connects the corresponding side edges of the large regular hexagonal prism 22 and the small regular hexagonal prism 21. Each side surface of the large regular hexagonal prism 22 is provided with an inwardly recessed groove 24. The position of the side edge indicates the position of the corner. Each side of the large regular hexagonal prism 22 is provided with an inwardly recessed groove 24, which can also be called a quasi-large regular hexagonal prism 22, that is, the six vertices of the bottom or top surface of the large regular hexagonal prism 22 are connected to form a regular hexagon. Correspondingly, there are six connecting ribs 23, which are connected one-to-one with the six side edges of the large regular hexagonal prism 22 and the small regular hexagonal prism 21. That is, one end of the connecting rib 23 is connected to the side edge of the large regular hexagonal prism 22, and the other end is connected to the side edge of the small regular hexagonal prism 21.

[0054] See Figures 1-3 The outer thin-walled tube 1 is a regular hexagonal thin-walled tube, and the corresponding sides of the regular hexagonal thin-walled tube and the small regular hexagonal prism 21 are parallel to each other. By setting the regular hexagonal thin-walled tube, the outer thin-walled tube 1, the small regular hexagonal prism 21 and the large regular hexagonal prism 22 are all hexagonal, which can improve the stability of the structure and thus improve the impact resistance.

[0055] See Figures 1-3The outer hexagon of the outer thin-walled tube 1 has a circumcircle diameter of 32 mm and a wall thickness of 0.6 mm. The circumcircle diameter of the large regular hexagon prism 22 is 8 mm. The circumcircle diameter of the small regular hexagon prism 21 is 4 mm. The wall thickness of the single-cell thin-walled energy-absorbing structure 2 is 0.3 mm. The single-cell thin-walled energy-absorbing structure 2 is hollow, which helps to reduce the weight of the snowflake-like multi-cell thin-walled energy-absorbing tube structure, thus achieving lightweighting. By setting the connecting ribs 23, the connection stability between the large regular hexagon prism 22 (outer structure) and the small regular hexagon prism 21 (inner structure) is improved, thereby increasing the rigidity of the entire snowflake-like multi-cell thin-walled energy-absorbing tube structure. This allows the snowflake-like multi-cell thin-walled energy-absorbing tube structure to have good buffering effect and impact resistance, while also possessing a certain degree of rigidity and load-bearing capacity.

[0056] See Figures 1-3 The structure comprises seven thin-walled unit cells 2, consisting of one central thin-walled unit cell energy-absorbing structure and six peripheral thin-walled unit cell energy-absorbing structures arranged around the central structure. These six peripheral structures are distributed circumferentially. Adjacent thin-walled unit cell energy-absorbing structures 2 are interconnected, and the peripheral structures are connected to the outer thin-walled tube 1. In this structure, adjacent thin-walled unit cell energy-absorbing structures 2 are interconnected, meaning that adjacent peripheral structures are connected, and adjacent peripheral structures are connected to the central structure. By setting seven thin-walled unit cell energy-absorbing structures 2 and distributing the six peripheral structures around the central structure, a honeycomb-like structure is formed, providing excellent energy absorption and impact resistance.

[0057] See Figures 1-3 The first multi-cell thin-walled energy-absorbing tube structure 100 further includes an intermediate energy-absorbing structure disposed between the outer thin-walled tube 1 and the surrounding single-cell thin-walled energy-absorbing structures. The intermediate energy-absorbing structure includes a first energy-absorbing structure 3 disposed between the side edge of the outer thin-walled tube 1 and the surrounding single-cell thin-walled energy-absorbing structures, and a second energy-absorbing structure 4 disposed between the inner sidewall of the outer thin-walled tube 1 and the surrounding single-cell thin-walled energy-absorbing structures. By providing the intermediate energy-absorbing structure, the connection between the outer thin-walled tube 1 and the surrounding single-cell thin-walled energy-absorbing structures is facilitated, and the energy absorption effect is improved.

[0058] See Figures 1-3Adjacent (two) unit cell thin-walled energy-absorbing structures 2 are connected side-to-side. That is, the sides of the corresponding large regular hexagonal prisms 22 between two adjacent peripheral unit cell thin-walled energy-absorbing structures are interconnected, and the sides of the corresponding large regular hexagonal prisms 22 between adjacent peripheral unit cell thin-walled energy-absorbing structures and the intermediate unit cell thin-walled energy-absorbing structure are interconnected. Since the intermediate unit cell thin-walled energy-absorbing structure has six sides of its large regular hexagonal prism 22, each of these six sides is connected to one side of the large regular hexagonal prism 22 of each peripheral unit cell thin-walled energy-absorbing structure. After the adjacent unit cell thin-walled energy-absorbing structures 2 are connected side-to-side, the grooves 24 on the sides of the two opposing large regular hexagonal prisms 22 will form a large groove 24. By placing the unit cell thin-walled energy-absorbing structures 2 inside the outer thin-walled tube 1, and through the regular arrangement of the unit cell thin-walled energy-absorbing structures 2 and the side-to-side connection, the limited space can be utilized to the maximum extent. Furthermore, the load can be distributed, the stability and compressive strength of the structure can be enhanced, the problem of excessive local stress can be reduced, and the safety of the structure can be improved.

[0059] See Figures 1-3 The side-to-side connection results in a high density and overall rigidity of the structure, allowing it to absorb more energy (EA) during compression.

[0060] See Figures 1-3 The first energy-absorbing structure 3 is the same as the single-cell thin-walled energy-absorbing structure 2, and the second energy-absorbing structure 4 is half of the single-cell thin-walled energy-absorbing structure 2. In the above structure, the first energy-absorbing structure 3 is identical to the single-cell thin-walled energy-absorbing structure 2, and the second energy-absorbing structure 4 is half of the single-cell thin-walled energy-absorbing structure 2. This facilitates the connection between the first energy-absorbing structure 3, the second energy-absorbing structure 4, the outer thin-walled tube 1, and the surrounding single-cell thin-walled energy-absorbing structures, making the structure more compact and improving the energy absorption effect. The sides of the corresponding large regular hexagonal prisms 22 between adjacent first energy-absorbing structures 3 and surrounding single-cell thin-walled energy-absorbing structures are interconnected. The sides of the corresponding large regular hexagonal prisms 22 between adjacent second energy-absorbing structures 4 and surrounding single-cell thin-walled energy-absorbing structures are interconnected. The inner wall of the outer thin-walled tube 1 is interconnected with the side of the large regular hexagonal prism 22 of the first energy-absorbing structure 3.

[0061] The second energy-absorbing structure 4 is half of the single-cell thin-walled energy-absorbing structure 2, that is, the second energy-absorbing structure 4 is half of the single-cell thin-walled energy-absorbing structure 2.

[0062] See Figures 1-3 The distance between the centerlines of two adjacent unit cell thin-walled energy-absorbing structures 2 is:

[0063]

[0064] Where r is the side length of the base of the large regular hexagonal prism 22, that is, the side length of the regular hexagon of the large regular hexagonal prism 22.

[0065] See Figures 1-3 The groove 24 is a rectangular groove. The rectangular groove is half a square, and the side length of the square is 3mm. The groove 24 is located in the middle of the side of the large regular hexagonal prism 22.

[0066] See Figures 1-3 The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure is formed by 3D printing from 316L stainless steel powder. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure has a regular shape, is easy to process through 3D printing, and uses lightweight stainless steel, resulting in a significant reduction in weight compared to traditional high-strength steel structures. This is beneficial for achieving lightweighting of new energy vehicle bodies and effectively reducing energy consumption.

[0067] Specifically, by selecting laser melting (SLM) 3D printing technology and using 15-53μm 316L stainless steel powder as raw material, an integrated snowflake-like multi-cell thin-walled energy absorber structure was finally obtained.

[0068] See Figures 1-3 and Figure 19 The experimental results of the energy absorption parameters show that the peak load of the snowflake-like multicellular thin-walled energy-absorbing tube structure in this embodiment is 280 kN, the effective energy absorption is 4435 J, the effective specific energy absorption is 41.84 J / g, and the average impact load is 255.9 kN. The peak load of a conventional metal thin-walled tube is 35 kN, the effective energy absorption is 517 J, the effective specific energy absorption is 23.5 J / g, and the average impact load is 18.4 kN.

[0069] See Figures 1-3 The working principle of the above-mentioned snowflake-like multi-cell thin-walled energy-absorbing tube structure for new energy vehicles is as follows:

[0070] The single-cell thin-walled energy-absorbing structure 2 is evolved from the snowflake structure and is a snowflake-like structure. The snowflake-like structure has excellent energy absorption performance. When a new energy vehicle collides, the snowflake-like multi-cell thin-walled energy-absorbing tube structure is subjected to a certain impact force. This external impact force acts on the large regular hexagonal prism 22 of each single-cell thin-walled energy-absorbing structure 2. After being buffered and transitioned by the connecting rib 23 and the gap between the large and small regular hexagonal prisms 22, the impact force is effectively reduced, thereby reducing the impact on the important structures of the new energy vehicle and effectively protecting the battery and personnel. The overall structure possesses good collision safety performance, with a high specific energy absorption SEA, high pressure collapse efficiency CFE, and a good deformation mode; thus, it can effectively coordinate the contradictions among the high specific energy absorption SEA, high pressure collapse efficiency CFE, and good deformation mode in the collision safety design process.

[0071] Example 2

[0072] See Figures 3-5 The other structures in this embodiment are the same as in Embodiment 1, except that adjacent (two) unit cell thin-walled energy-absorbing structures 2 are connected by side edge to side edge. That is, the side edges of the corresponding large regular hexagonal prisms 22 between two adjacent peripheral unit cell thin-walled energy-absorbing structures are interconnected, and the side edges of the corresponding large regular hexagonal prisms 22 between adjacent peripheral unit cell thin-walled energy-absorbing structures and the intermediate unit cell thin-walled energy-absorbing structure are interconnected. Since the intermediate unit cell thin-walled energy-absorbing structure has six side edges, each of these six side edges connects to one side edge of the large regular hexagonal prism 22 of each peripheral unit cell thin-walled energy-absorbing structure. After the adjacent unit cell thin-walled energy-absorbing structures 2 are connected by side edge to side edge, the sides of the three interconnected large regular hexagonal prisms 22 form a triangular channel, which communicates with the corresponding grooves 24 on the side surfaces. Using a side edge to side edge connection increases the void density between the unit cell thin-walled energy-absorbing structures 2, reducing structural weight while maintaining stability and compressive strength, resulting in relatively high energy absorption.

[0073] See Figures 3-5 The side-to-side connection method can also be described as multiple unit cell thin-walled energy-absorbing structures 2 using a "point-to-point" array, that is, the vertices of the large regular hexagonal prisms 22 of adjacent unit cell thin-walled energy-absorbing structures 2 are connected to each other. The distance between the centerlines of any two adjacent unit cell thin-walled energy-absorbing structures 2 is 8 mm.

[0074] See Figures 3-5 The first energy-absorbing structure 3 is one-third of the single-cell thin-walled energy-absorbing structure 2, and the second energy-absorbing structure 4 is one-half of the single-cell thin-walled energy-absorbing structure 2. That is, the first energy-absorbing structure 3 is one-third of the single-cell thin-walled energy-absorbing structure 2, and the second energy-absorbing structure 4 is one-half of the single-cell thin-walled energy-absorbing structure 2.

[0075] The purpose of the above structure is to facilitate the connection between the first energy-absorbing structure 3, the second energy-absorbing structure 4, the outer thin-walled tube 1, and the surrounding unit cell thin-walled energy-absorbing structures, making the structure more compact and improving the energy absorption effect. The side edges of the corresponding large regular hexagonal prism 22 between adjacent first energy-absorbing structures 3 and surrounding unit cell thin-walled energy-absorbing structures are interconnected, and the side edges of the corresponding large regular hexagonal prism 22 between adjacent second energy-absorbing structures 4 and surrounding unit cell thin-walled energy-absorbing structures are interconnected.

[0076] See Figures 3-5 and Figure 19The experimental results of the energy absorption parameters show that the peak load of the snowflake-like multi-cell thin-walled energy-absorbing tube structure in this embodiment is 230kN, the effective energy absorption is 4135J, the effective specific energy absorption is 43.75J / g, and the average impact load is 218.8kN.

[0077] Example 3

[0078] See Figures 6-8 The other structures in this embodiment are the same as in embodiment 1, except that the groove 24 is a semi-circular groove. The diameter of the semi-circular groove is 3mm.

[0079] See Figures 6-8 and Figure 19 The experimental results of the energy absorption parameters show that the peak load of the snowflake-like multi-cell thin-walled energy-absorbing tube structure in this embodiment is 295kN, the effective energy absorption is 4536J, the effective specific energy absorption is 42.2J / g, and the average impact load is 265.3kN.

[0080] Example 4

[0081] See Figures 8-10 The other structures in this embodiment are the same as in embodiment 2, except that the groove 24 is a semi-circular groove.

[0082] See Figures 8-10 and Figure 19 The experimental results of the energy absorption parameters show that the peak load of the snowflake-like multi-cell thin-walled energy-absorbing tube structure in this embodiment is 205kN, the effective energy absorption is 4467J, the effective specific energy absorption is 47.77J / g, and the average impact load is 192.5kN.

[0083] Example 5

[0084] See Figure 8 and Figures 11-12 The other structures in this embodiment are the same as in embodiment 3, except that the first energy-absorbing structure 3 is a hollow large regular hexagonal prism 22, and the second energy-absorbing structure 4 is half of the hollow large regular hexagonal prism 22. That is, the second energy-absorbing structure 4 is half of the hollow large regular hexagonal prism. The above structure uses a combination of the unit cell thin-walled energy-absorbing structure 2 and the outermost large regular hexagonal prism 22 of the unit cell thin-walled energy-absorbing structure 2, which reduces the overall structural mass while maintaining sufficient stability and compressive strength. This allows the structure to absorb most of the impact energy, buffering the impact force and providing protection, reducing the degree of damage, reducing maintenance costs, and increasing the load-bearing life.

[0085] The large hexagonal prism 22 in this embodiment is also provided with the groove 24.

[0086] See Figure 8 , Figures 11-12 and Figure 19 The experimental results of the energy absorption parameters show that the peak load of the snowflake-like multi-cell thin-walled energy-absorbing tube structure in this embodiment is 200kN, the effective energy absorption is 2983J, the effective specific energy absorption is 35.43J / g, and the average impact load is 171.3kN.

[0087] Example 6

[0088] See Figure 8 and Figures 13-16 The other structures in this embodiment are the same as in Embodiment 3, except that the snowflake-like layered multi-cell thin-walled energy-absorbing tube structure further includes a second multi-cell thin-walled energy-absorbing tube structure 200. The first multi-cell thin-walled energy-absorbing tube structure 100 and the second multi-cell thin-walled energy-absorbing tube structure 200 are connected vertically to each other. The other structures of the second multi-cell thin-walled energy-absorbing tube structure 200 are the same as those of the first multi-cell thin-walled energy-absorbing tube structure 100, except that the second multi-cell thin-walled energy-absorbing tube structure 200 does not include the small regular hexagonal prism 21 and the connecting rib 23. That is, the second multi-cell thin-walled energy-absorbing tube structure 200 includes an outer thin-walled tube 1 and an inner multi-cell thin-walled energy-absorbing structure disposed within the outer thin-walled tube 1. The inner multi-cell thin-walled energy-absorbing structure includes seven arranged single-cell thin-walled energy-absorbing structures 2, each of which includes a hollow large regular hexagonal prism 22. Each side of the large regular hexagonal prism 22 is provided with an inwardly recessed groove 24. The second multi-cell thin-walled energy-absorbing tube structure 200 retains only the large regular hexagonal prism 22, that is, it retains the outer layer structure of the single-cell thin-walled energy-absorbing structure 2. The outer layer structure of the single-cell thin-walled energy-absorbing structure 2 is used as the basic unit and filled into the outer thin-walled tube 1 in an array. The first multi-cell thin-walled energy-absorbing tube structure 100 and the second multi-cell thin-walled energy-absorbing tube structure 200 have good performance through the combination of the upper and lower "series". The second multi-cell thin-walled energy-absorbing tube structure 200 is located on top and can provide a good buffering effect when it is impacted, so as not to cause a large initial peak force. The first multi-cell thin-walled energy-absorbing tube structure 100 below can provide good rigidity, which can both avoid passengers from being seriously injured and take into account the overall load-bearing capacity of the structure.

[0089] See Figure 8 and Figures 13-16 The first multi-cell thin-walled energy absorber structure 100 and the second multi-cell thin-walled energy absorber structure 200 are integrally set.

[0090] See Figure 8 and Figures 13-16In Example 1, the height of the first multi-cell thin-walled energy absorber structure 100 is equal to the sum of the heights of the first multi-cell thin-walled energy absorber structure 100 and the second multi-cell thin-walled energy absorber structure 200 in this embodiment. That is, the snowflake-like layered multi-cell thin-walled energy absorber structure in this embodiment is divided into upper and lower parts: the upper part is the second multi-cell thin-walled energy absorber structure 200, and the lower part is the first multi-cell thin-walled energy absorber structure 100.

[0091] In this embodiment, the first energy-absorbing structure 3 of the second multi-cell thin-walled energy-absorbing tube structure 200 is a hollow large regular hexagonal prism 22, and the second energy-absorbing structure 4 of the second multi-cell thin-walled energy-absorbing tube structure 200 is half of the hollow large regular hexagonal prism 22.

[0092] See Figure 8 , Figures 13-16 and Figure 19 The experimental results of the energy absorption parameters show that the peak load of the snowflake-like multi-cell thin-walled energy-absorbing tube structure in this embodiment is 215kN, the effective energy absorption is 3574J, the effective specific energy absorption is 41.8J / g, and the average impact load is 148kN.

[0093] See Figure 19 The five energy absorption parameters are peak load (PCF), average load (MCF), energy absorption (EA), specific energy absorption (SEA), and load efficiency (i.e., crushing efficiency CFE). Specific energy absorption (SEA) is the main energy absorption evaluation parameter, which is the energy absorbed per unit mass. Considering other parameters, the energy absorption and impact protection effect of the snowflake-like multi-cell thin-walled energy-absorbing tube structure in Example 4 is the best.

[0094] See Figures 20-25 In Examples 1-6, during simulated compression deformation, the formation of wrinkles in the snowflake-like layered multicellular thin-walled energy-absorbing tube structures of Examples 1-6 during deformation was observed. As the deformation increases, the number of wrinkles also increases, resulting in the absorption of more energy and a better energy absorption effect.

[0095] See Figure 19 and Figures 26-27 , Figure 26 and Figure 27 The figures show the load-displacement curves and energy absorption curves of a snowflake-like layered multicellular thin-walled energy-absorbing tube structure, respectively. Figure 1 The energy absorption parameters of the snowflake-like layered multicellular thin-walled energy-absorbing tube structure and ordinary metal thin-walled tubes (hereinafter referred to as thin-walled tubes) were compared. It can be concluded that, compared with ordinary metal thin-walled tubes, Examples 1-6 show an increase in specific energy absorption of over 50%, with Example 4 showing an even greater increase of 103% in specific energy absorption. Therefore, it can be concluded that this embodiment significantly improves the upper limit of energy absorption of the automotive energy-absorbing box, and the structure is also more stable.

[0096] See Figures 17-19 , Figure 17 These are energy-absorbing structures of different shapes for single cells in existing technologies. Figure 18 The evaluation results of energy absorption parameters of energy-absorbing structures of different shapes of single cells in the prior art show that, compared with the prior art, the snowflake-like layered multicellular thin-walled energy-absorbing tube structures of Examples 1-6 have higher specific energy absorption (SEA) and crushing force efficiency (CFE), and the effect is greatly improved.

[0097] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above content. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A snowflake-inspired layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles, comprising a first multi-cell thin-walled energy-absorbing tube structure, wherein the first multi-cell thin-walled energy-absorbing tube structure includes an outer thin-walled tube and an inner multi-cell thin-walled energy-absorbing structure disposed within the outer thin-walled tube, characterized in that, The inner multi-cell thin-walled energy-absorbing structure comprises multiple arranged single-cell thin-walled energy-absorbing structures. Each single-cell thin-walled energy-absorbing structure includes a hollow small regular hexagonal prism, a hollow large regular hexagonal prism fitted outside the small regular hexagonal prism, and a connecting rib plate disposed between the small and large regular hexagonal prisms. The central axes of the large and small regular hexagonal prisms coincide, and the side surfaces of the large and small regular hexagonal prisms correspond to each other and are parallel. The connecting rib plate connects the corresponding side edges of the large and small regular hexagonal prisms. Each side surface of the large regular hexagonal prism is provided with an inwardly recessed groove. The snowflake-like layered multi-cell thin-walled energy absorber structure also includes a second multi-cell thin-walled energy absorber structure. The first and second multi-cell thin-walled energy absorber structures are connected vertically to each other. The other structures of the second multi-cell thin-walled energy absorber structure are the same as those of the first multi-cell thin-walled energy absorber structure. The difference is that the second multi-cell thin-walled energy absorber structure does not include small regular hexagonal prisms and connecting ribs.

2. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to claim 1, characterized in that, The outer thin-walled tube is a regular hexagonal thin-walled tube, and the corresponding side surfaces of the regular hexagonal thin-walled tube correspond to and are parallel to the small regular hexagonal prism. The number of unit cell thin-walled energy-absorbing structures is 7. The 7 unit cell thin-walled energy-absorbing structures are divided into 1 intermediate unit cell thin-walled energy-absorbing structure and 6 peripheral unit cell thin-walled energy-absorbing structures arranged around the intermediate unit cell thin-walled energy-absorbing structure. The 6 peripheral unit cell thin-walled energy-absorbing structures are distributed along the circumference. Adjacent unit cell thin-walled energy-absorbing structures are interconnected, and the peripheral unit cell thin-walled energy-absorbing structures are connected to the outer thin-walled tube.

3. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to claim 2, characterized in that, The first multi-cell thin-walled energy-absorbing tube structure further includes an intermediate energy-absorbing structure disposed between the outer thin-walled tube and the peripheral single-cell thin-walled energy-absorbing structure; the intermediate energy-absorbing structure includes a first energy-absorbing structure disposed between the side edge of the outer thin-walled tube and the peripheral single-cell thin-walled energy-absorbing structure and a second energy-absorbing structure disposed between the inner sidewall of the outer thin-walled tube and the peripheral single-cell thin-walled energy-absorbing structure.

4. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to claim 3, characterized in that, Adjacent unit cell thin-walled energy-absorbing structures are connected side-to-side.

5. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to claim 3, characterized in that, Adjacent unit cell thin-walled energy-absorbing structures are connected by side edge to side edge.

6. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to claim 4, characterized in that, The first energy-absorbing structure is the single-cell thin-walled energy-absorbing structure, and the second energy-absorbing structure is half of the single-cell thin-walled energy-absorbing structure.

7. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to claim 5, characterized in that, The first energy-absorbing structure is one-third of the single-cell thin-walled energy-absorbing structure, and the second energy-absorbing structure is one-half of the single-cell thin-walled energy-absorbing structure.

8. The snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to claim 4, characterized in that, The first energy-absorbing structure is a hollow large regular hexagonal prism, and the second energy-absorbing structure is half of the hollow large regular hexagonal prism.

9. A snowflake-like layered multi-cell thin-walled energy-absorbing tube structure for new energy vehicles according to any one of claims 1-8, characterized in that, The snowflake-like layered multicellular thin-walled energy-absorbing tube structure is formed by 3D printing from 316L stainless steel powder.

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