Front floor assembly structure and new energy vehicle

Abstract

The invention discloses a front floor assembly structure and a new energy vehicle, and relates to the technical field of new energy vehicles, a drainage structure of the front floor assembly structure comprises a front floor body, two threshold structures, two seat rear cross beam structures and a reinforcing cross beam structure, the middle of the front floor body is arranged in a protruding mode, and a central channel is formed at the protruding position; the two doorsill structures are arranged on the left side and the right side of the front floor body respectively, the doorsill body is provided with an inner cavity, the doorsill reinforcing beam is arranged in the inner cavity, and the doorsill connecting plates are arranged between the doorsill body and the front floor body at intervals in the front-back direction. The two seat rear cross beam structures are arranged on the two sides of the central channel respectively and fixedly arranged on the upper side face of the front floor body. The reinforcing cross beam structure is arranged on the central channel in a striding mode and arranged on the lower side face of the front floor body in the front-back direction corresponding to the seat rear cross beam structure. The invention provides the front floor assembly structure which meets the European Union side column collision regulation standard and is low in development cost.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, and in particular to a front floor assembly structure and a new energy vehicle. Background Technology

[0002] Side pole impact regulations have been incorporated into my country's national standards, but they are not currently mandatory. Therefore, to reduce vehicle development costs, domestically produced models only meet the side impact regulations. However, with the continuous growth of China's new energy vehicle industry and the rapid increase in total vehicle exports, most domestically produced models do not meet the EU side pole impact regulations, affecting the sales of exported vehicles in the EU region.

[0003] Currently, many manufacturers redesign their front floor assembly production lines to produce compliant front floor assemblies in order to meet EU side-pole collision regulations. However, this significantly increases development costs and extends the development cycle. Summary of the Invention

[0004] The main objective of this invention is to propose a front floor assembly structure and a new energy vehicle, aiming to provide a front floor assembly structure that complies with EU side pole impact regulations and has low development costs.

[0005] To achieve the above objectives, the present invention proposes a front floor assembly structure, comprising:

[0006] The front floor body has a raised section in the middle to form a central channel at the raised section. Two threshold structures are respectively located on the left and right sides of the front floor body. Each threshold structure includes a threshold body, a threshold reinforcing beam, and multiple threshold connecting plates. The threshold body has an inner cavity, the threshold reinforcing beam is located in the inner cavity, and the multiple threshold connecting plates are spaced apart between the threshold body and the front floor body in the front-back direction. Two rear seat crossbeam structures are respectively located on both sides of the central aisle and fixed to the upper side of the front floor body; the two rear seat crossbeam structures extend in the left-right direction; and, A reinforcing beam structure is provided across the central aisle and is located on the lower side of the front floor body corresponding to the seat rear beam structure in the front-rear direction. The reinforcing beam structure extends in the left-right direction.

[0007] In one embodiment, each of the seat rear crossbeam structures has an inner cavity; The front floor assembly structure also includes two seat rear crossbeam reinforcement plates, which extend in the left and right directions and are correspondingly disposed in the inner cavities of the two seat rear crossbeam structures.

[0008] In one embodiment, the front floor assembly structure further includes a central channel lower reinforcement plate, which is fixedly disposed on the upper side of the reinforcing beam structure and is disposed corresponding to the central channel.

[0009] In one embodiment, the reinforcing beam structure is provided with a plurality of first connecting holes in the vertical direction, and the central channel lower reinforcing plate is provided with second connecting holes corresponding to the plurality of first connecting holes. The front floor assembly structure is also provided with a plurality of first fasteners, each of which passes through the first connecting hole and the corresponding second connecting hole in sequence.

[0010] In one embodiment, the front floor assembly structure further includes two battery pack longitudinal beam structures, which are disposed on the lower side of the front floor body and are respectively located between the sill body and the central channel; The plurality of threshold connecting plates are respectively located between the threshold body and the battery pack longitudinal beam structure.

[0011] In one embodiment, each of the battery pack longitudinal beam structures has an inner cavity; The front floor assembly structure also includes two battery pack longitudinal beam reinforcing plates, which are correspondingly disposed in the inner cavities of the two battery pack longitudinal beam structures.

[0012] In one embodiment, the battery pack longitudinal beam structure is provided with a plurality of third connecting holes in the vertical direction, and the battery pack longitudinal beam reinforcing plate is provided with a fourth connecting hole corresponding to the plurality of third connecting holes. The front floor assembly structure is also provided with a plurality of second fasteners, each of which passes sequentially through the third connecting hole and the corresponding fourth connecting hole.

[0013] In one embodiment, the middle part of the reinforcing beam structure is convex downward to form a groove extending in the left-right direction.

[0014] In one embodiment, the material of the front floor assembly structure includes advanced high-strength steel.

[0015] The present invention also proposes a new energy vehicle, the new energy vehicle including the above-mentioned front floor assembly structure, the front floor assembly structure including: The front floor body has a raised section in the middle to form a central channel at the raised section. Two threshold structures are respectively located on the left and right sides of the front floor body. Each threshold structure includes a threshold body, a threshold reinforcing beam, and multiple threshold connecting plates. The threshold body has an inner cavity, the threshold reinforcing beam is located in the inner cavity, and the multiple threshold connecting plates are spaced apart between the threshold body and the front floor body in the front-back direction. Two rear seat crossbeam structures are respectively located on both sides of the central aisle and fixed to the upper side of the front floor body; the two rear seat crossbeam structures extend in the left-right direction; and, A reinforcing beam structure is provided across the central aisle and is located on the lower side of the front floor body corresponding to the seat rear beam structure in the front-rear direction. The reinforcing beam structure extends in the left-right direction.

[0016] The technical solution of this invention, by setting a sill reinforcement beam, can absorb energy at the first moment of impact, preventing premature collapse of the sill cross-section. By setting multiple sill connecting plates, the concentrated impact force is converted into a distributed load, thereby evenly transferring it to the interior of the vehicle body and reducing the impact. By setting a reinforcement beam structure corresponding to the rear crossbeam of the seat, and setting the two in a staggered manner in the vertical direction, the cross-sectional moment of inertia of the front floor assembly is effectively increased, significantly improving the bending stiffness of the floor. When a side pole impact occurs, the impact force is transmitted through the sill, partially absorbed by the sill reinforcement beam, then diverted to the front floor body through the sill connecting plate, and then quickly transferred to the rear crossbeam of the seat. Finally, the reinforcement beam running through the central channel directs the energy to the opposite side of the vehicle body, achieving lateral dissipation of energy. This multi-path, multi-dimensional force transmission mechanism greatly reduces the direct intrusion of the collision point into the passenger compartment, protects the survival space of the occupants, and also avoids thermal runaway of the battery pack due to local excessive compression, significantly improving the passive safety performance of the entire vehicle and complying with EU side pole impact regulations. Meanwhile, this solution has a simple structure, only affects the welding sequence of sub-assemblies, has low production line modification costs, and is easy to implement for mass production. Attached Figure Description

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

[0018] Figure 1 This is a structural diagram of the front floor assembly in the prior art; Figure 2 for Figure 1 A schematic diagram of the front floor assembly structure at the rear crossbeam of the seat; Figure 3 for Figure 1 A cross-sectional schematic diagram of AA in the middle; Figure 4 for Figure 1 Simulation diagram of the front and mid-floor assembly structure after a side impact; Figure 5 A schematic diagram of an embodiment of the front floor assembly structure provided by the present invention; Figure 6 for Figure 5 A schematic diagram of the front floor assembly structure at the rear crossbeam structure of the seat; Figure 7 for Figure 5 Cross-sectional schematic diagram of BB; Figure 8 for Figure 5 Simulation diagram of the front and middle floor assembly structure after a side impact.

[0019] Explanation of icon numbers: 100. Front floor assembly structure; 1. Front floor body; 11. Central tunnel; 2. Sill structure; 21. Sill body; 22. Sill reinforcement beam; 23. Sill connecting plate; 3. Rear seat crossbeam structure; 4. Reinforced crossbeam structure; 5. Rear seat crossbeam reinforcement plate; 6. Lower central tunnel reinforcement plate; 7. Battery pack longitudinal beam structure; 8. Battery pack longitudinal beam reinforcement plate.

[0020] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] Side pole impact regulations have been incorporated into my country's national standards, but they are not currently mandatory. Therefore, to reduce vehicle development costs, domestically produced models only meet the side impact regulations. However, with the continuous growth of China's new energy vehicle industry and the rapid increase in total vehicle exports, most domestically produced models do not meet the EU side pole impact regulations, affecting the sales of exported vehicles in the EU region.

[0025] In existing front floor assembly structures for new energy vehicles, the connections between the door sill, floor, and rear seat crossbeams are often loose, resulting in discontinuous force transmission paths. In the event of a side pole impact, the collision energy cannot be effectively dispersed to the central tunnel and opposite side structures, leading to localized stress concentration, causing door sill breakage, battery pack deformation, and even fire. Furthermore, traditional improvement solutions often require large-scale production line modifications, resulting in high costs and long lead times.

[0026] For details, please refer to Figures 1 to 3 The existing front floor assembly structure includes the front floor body 1', two sill structures 2', and two rear seat crossbeam structures 3'. When a car skids and impacts a rigid pillar such as a tree or utility pole in an accident, the force transmission path is as follows: the sills and B-pillar reinforcement plates deform upon impact, then the force is transmitted to the front and rear seat crossbeams, and finally the central tunnel also deforms. Please refer to [reference needed]. Figure 4 As can be seen from the figure, the sill structure 2', the seat rear crossbeam structure 3', and even the central aisle 11' are severely damaged.

[0027] Therefore, the main objective of this invention is to propose a front floor assembly structure and a new energy vehicle, aiming to provide a front floor assembly structure that complies with EU side pole impact regulations and has low development costs.

[0028] Please refer to Figure 5 and Figure 7The aforementioned front floor assembly structure 100 includes a front floor body 1, two sill structures 2, two seat rear crossbeam structures 3, and a reinforcing crossbeam structure 4. The front floor body 1 has a raised center to form a central passage 11. The two sill structures 2 are located on the left and right sides of the front floor body 1, and each sill structure 2 includes a sill body 21, a sill reinforcing beam 22, and multiple sill connecting plates 23. The sill body 21 has an inner cavity, the sill reinforcing beam 22 is located in the inner cavity, and the multiple sill connecting plates 23 are spaced apart between the sill body 21 and the front floor body 1 in the front-rear direction. The two seat rear crossbeam structures 3 are located on both sides of the central passage 11 and are fixed to the upper side of the front floor body 1, extending in the left-right direction. The reinforcing crossbeam structure 4 spans the central passage 11 and is located on the lower side of the front floor body 1 in the front-rear direction corresponding to the seat rear crossbeam structures 3, extending in the left-right direction.

[0029] The technical solution of this invention, by setting a sill reinforcement beam 22, can absorb energy at the first moment of impact, preventing premature collapse of the sill cross section. By setting multiple sill connecting plates 23, the concentrated impact force is converted into a distributed load, thereby evenly transmitting it to the interior of the vehicle body and reducing the impact. By setting a reinforcement crossbeam structure 4 corresponding to the rear crossbeam of the seat, the two are staggered in the vertical direction, which effectively increases the moment of inertia of the front floor assembly and significantly improves the bending stiffness of the floor. When a side pole impact occurs, the impact force is transmitted through the sill, part of which is absorbed by the sill reinforcement beam 22, and then diverted to the front floor body 1 through the sill connecting plate 23, and then quickly transmitted to the rear crossbeam of the seat. Finally, the reinforcement crossbeam passing through the central channel 11 directs the energy to the opposite side of the vehicle body, realizing the lateral dissipation of energy. This multi-path, multi-dimensional force transmission mechanism greatly reduces the direct intrusion of the collision point into the passenger compartment, protects the survival space of the occupants, and also avoids thermal runaway of the battery pack due to local excessive compression, significantly improving the passive safety performance of the entire vehicle and complying with EU side pole impact regulations. Meanwhile, this solution has a simple structure, only affects the welding sequence of sub-assemblies, has low production line modification costs, and is easy to implement for mass production.

[0030] Please refer to Figure 8 , Figure 8 This is a simulation diagram of the front floor assembly structure after a 100mm side impact. Figure 8 It can be seen that compared to Figure 4 The collapse phenomenon at the door sill structure 2, seat rear crossbeam structure 3, and central tunnel 11 has been significantly improved, meeting the standards of the EU side pillar collision regulations.

[0031] In one embodiment of the present invention, each of the rear seat crossbeam structures 3 has an inner cavity; the front floor assembly structure 100 further includes two rear seat crossbeam reinforcing plates 5, which extend laterally and are correspondingly disposed within the inner cavities of the two rear seat crossbeam structures 3. This arrangement, through the reinforced inner cavity design, ensures that the crossbeams maintain structural integrity under high-energy impacts, preserving the continuity of the force transmission path, thereby minimizing inward displacement of the door. Simultaneously, the inner cavity reinforcing plates can also serve as reinforcements for the seat mounting points, improving the seat's fixation reliability during a collision.

[0032] In one embodiment of the present invention, the front floor assembly structure 100 further includes a central channel lower reinforcing plate 6, which is fixedly disposed on the upper side of the reinforcing beam structure 4 and corresponds to the central channel 11. With this arrangement, the addition of the central channel lower reinforcing plate 6, together with the original front floor body 1 and the reinforcing beam, forms a high-rigidity box-shaped structure. This multi-layered design not only increases the total thickness of the material but also restricts the independent deformation of each layer, forcing them to work together to resist external forces. When impact energy is transferred to the central channel 11, the central channel lower reinforcing plate 6 can effectively disperse concentrated stress, preventing local buckling of the central channel 11 wall.

[0033] It should be noted that this solution does not limit the method of fixing the central channel lower reinforcing plate 6 to the reinforcing beam structure 4. In one embodiment provided by the present invention, the reinforcing beam structure 4 is provided with a plurality of first connecting holes along the vertical direction, and the central channel lower reinforcing plate 6 is provided with second connecting holes corresponding to the plurality of first connecting holes; the front floor assembly structure 100 is also provided with a plurality of first fasteners, each of the first fasteners passing through each of the first connecting holes and the corresponding second connecting holes in sequence. This arrangement ensures a tight connection and facilitates assembly. Of course, a fixed connection can also be achieved by welding, bonding, or other methods.

[0034] In one embodiment of the present invention, the front floor assembly structure 100 further includes two battery pack longitudinal beam structures 7, which are disposed on the lower side of the front floor body 1 and respectively located between the sill body 21 and the central channel; a plurality of sill connecting plates 23 are respectively located between the sill body 21 and the battery pack longitudinal beam structures 7. With this configuration, the battery pack longitudinal beam structures 7 not only serve as load-bearing components for the battery but also become an important component of the force transmission path in a side impact collision. When the side pillar impacts the sill, the impact force is rapidly diverted to the battery pack longitudinal beams through the sill connecting plates 23, utilizing the high rigidity of the battery pack longitudinal beams to transfer energy towards the center of the vehicle body, thus achieving lateral force diffusion.

[0035] Furthermore, each of the battery pack longitudinal beam structures 7 has an inner cavity; the front floor assembly structure 100 also includes two battery pack longitudinal beam reinforcing plates 8, which are correspondingly disposed in the inner cavities of the two battery pack longitudinal beam structures 7. With this arrangement, the built-in battery pack longitudinal beam reinforcing plates 8, through their connection with the inner wall of the battery pack longitudinal beam structure 7, form a support structure similar to a rib, significantly improving the bending section modulus and torsional stiffness of the longitudinal beam section.

[0036] It should be noted that this solution does not limit the method of fixing the battery pack longitudinal beam reinforcing plate 8 to the battery pack longitudinal beam structure 7. In one embodiment provided by the present invention, the battery pack longitudinal beam structure 7 is provided with a plurality of third connecting holes in the vertical direction, and the battery pack longitudinal beam reinforcing plate 8 is provided with fourth connecting holes corresponding to the plurality of third connecting holes; the front floor assembly structure 100 is also provided with a plurality of second fasteners, each of the second fasteners passing sequentially through each of the third connecting holes and the corresponding fourth connecting hole. This arrangement ensures a tight connection and facilitates assembly. Of course, a fixed connection can also be achieved by welding, bonding, or other methods.

[0037] In one embodiment of the present invention, the middle part of the reinforcing beam structure 4 is convex downward to form a groove extending in the left-right direction. From a mechanical point of view, this downward convex groove design actually increases the cross-sectional height of the beam. Since the bending stiffness of the beam is proportional to the cross-sectional height, this small shape change can significantly improve the bending resistance of the beam, making it less prone to bending deformation when subjected to lateral impact.

[0038] In one embodiment of the present invention, the front floor assembly structure 100 is made of advanced high-strength steel. Using advanced high-strength steel to manufacture key load-bearing components such as the sill reinforcement beam 22, the rear seat crossbeam, and the battery pack longitudinal beam ensures that these components do not fracture under high-speed impacts, maintaining the integrity of the force transmission path. Simultaneously, the application of advanced high-strength steel also improves the overall torsional stiffness of the vehicle body, enhancing handling stability and NVH performance, providing users with a safer, more energy-efficient, and more comfortable driving experience.

[0039] The present invention also proposes a new energy vehicle, which includes the aforementioned front floor assembly structure 100. Since the new energy vehicle includes the front floor assembly structure 100, the specific structure of which is as described in the above embodiments is referred to. As the front floor assembly structure 100 of this new energy vehicle adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0040] The above are merely exemplary embodiments of the present invention and do not limit the scope of the patent of the present invention. All equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of patent protection of the present invention.

Claims

1. A front floor assembly structure, characterized in that, include: The front floor body has a raised section in the middle to form a central channel at the raised section. Two threshold structures are respectively located on the left and right sides of the front floor body. Each threshold structure includes a threshold body, a threshold reinforcing beam, and multiple threshold connecting plates. The threshold body has an inner cavity, the threshold reinforcing beam is located in the inner cavity, and the multiple threshold connecting plates are spaced apart between the threshold body and the front floor body in the front-back direction. Two seat rear crossbeam structures are respectively located on both sides of the central aisle and fixed to the upper side of the front floor body. The two seat rear crossbeam structures extend in the left and right direction. as well as, A reinforcing beam structure is provided across the central aisle and is located on the lower side of the front floor body corresponding to the seat rear beam structure in the front-rear direction. The reinforcing beam structure extends in the left-right direction.

2. The front floor assembly structure as described in claim 1, characterized in that, Each of the aforementioned seat rear crossbeam structures has an inner cavity; The front floor assembly structure also includes two seat rear crossbeam reinforcement plates, which extend in the left and right directions and are correspondingly disposed in the inner cavities of the two seat rear crossbeam structures.

3. The front floor assembly structure as described in claim 1, characterized in that, The front floor assembly structure also includes a central channel lower reinforcement plate, which is fixedly disposed on the upper side of the reinforcing beam structure and is positioned corresponding to the central channel.

4. The front floor assembly structure as described in claim 3, characterized in that, The reinforcing beam structure is provided with multiple first connecting holes in the vertical direction, and the central channel lower reinforcing plate is provided with second connecting holes corresponding to the multiple first connecting holes. The front floor assembly structure is also provided with a plurality of first fasteners, each of which passes through the first connecting hole and the corresponding second connecting hole in sequence.

5. The front floor assembly structure as described in claim 1, characterized in that, The front floor assembly structure also includes two battery pack longitudinal beam structures, which are located on the lower side of the front floor body and are respectively located between the sill body and the central channel. The plurality of threshold connecting plates are respectively located between the threshold body and the battery pack longitudinal beam structure.

6. The front floor assembly structure as described in claim 5, characterized in that, Each of the battery pack longitudinal beam structures has an internal cavity; The front floor assembly structure also includes two battery pack longitudinal beam reinforcing plates, which are correspondingly disposed in the inner cavities of the two battery pack longitudinal beam structures.

7. The front floor assembly structure as described in claim 6, characterized in that, The battery pack longitudinal beam structure is provided with multiple third connecting holes in the vertical direction, and the battery pack longitudinal beam reinforcing plate is provided with fourth connecting holes corresponding to the multiple third connecting holes. The front floor assembly structure is also provided with a plurality of second fasteners, each of which passes sequentially through the third connecting hole and the corresponding fourth connecting hole.

8. The front floor assembly structure as described in claim 1, characterized in that, The middle part of the reinforcing beam structure is convex downward to form a groove extending in the left-right direction.

9. The front floor assembly structure as described in claim 1, characterized in that, The materials used in the front floor assembly structure include advanced high-strength steel.

10. A new energy vehicle, characterized in that, The new energy vehicle includes the front floor assembly structure as described in any one of claims 1 to 9.

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