Automobile side pillar impact underbody structure

Abstract

The application discloses a kind of car side column impact under vehicle body structure, it is related to automobile manufacturing technical field, including upper force path system, lower force path system and be used to connect upper force path system, sill beam of lower force path system, the upper force path system includes side-by-side arrangement front seat installation crossbeam and battery pack installation crossbeam, the lower force path system includes battery pack installation beam and is used to install battery pack installation frame of battery pack installation beam, the upper side of the sill beam is fixed to the same end of front seat installation crossbeam and battery pack installation crossbeam, the lower side of the sill beam is fixed to battery pack installation beam;Upper force path system and lower force path system are connected together by sill beam, and upper force path system and lower force path system stiffness match, can reduce the possibility of battery pack damage when being impacted.

Description

Technical Field

[0001] This invention relates to the field of automobile manufacturing technology, and specifically to a vehicle body structure for a side pillar impact. Background Technology

[0002] Electric vehicles, as a type of new energy vehicle, have the advantages of energy conservation and environmental protection. Electric vehicles are increasingly becoming a research hotspot in the automotive field. At present, a common problem in the field of electric vehicles is the limited driving range of electric vehicle batteries, which restricts the promotion and application of electric vehicles. The battery packs of current vehicles are designed with extreme limits, which reduces the gap between the door sill and the battery cells, greatly increasing the risk of the battery cells being squeezed in the side pole collision test. Within a limited space, how to minimize cost and weight while preventing the battery cells from being squeezed through structural design poses a considerable challenge to engineers. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a vehicle body structure that can achieve stable crushing deformation and prevent battery pack cells from intruding upon impact with a side pillar.

[0004] The vehicle side pillar impact-under-body structure provided by this invention adopts the following technical solution:

[0005] A vehicle side pillar impact-down body structure includes an upper force transmission path system, a lower force transmission path system, and a sill beam for connecting the upper and lower force transmission path systems. The upper force transmission path system includes a front seat mounting beam and a battery pack mounting beam arranged side by side. The lower force transmission path system includes a battery pack mounting beam and a battery pack mounting frame for mounting the battery pack mounting beam. The upper side of the sill beam is fixed to the same end of the front seat mounting beam and the battery pack mounting beam, and the lower side of the sill beam is fixed to the battery pack mounting beam.

[0006] Furthermore, the threshold beam is provided with several vertical and horizontal ribs, which divide the threshold beam into an outer cavity and an inner cavity. The vertical and horizontal ribs in the outer cavity have a higher density than those in the inner cavity. The stiffness of the inner cavity is greater than that of the outer cavity. The bottom plate of the outer cavity is arched upward in an arc shape to form a crushing induction structure.

[0007] Furthermore, the vertical ribs located on the bottom plate of the inner cavity are offset towards the inner cavity.

[0008] Furthermore, the front seat mounting beam includes a front seat mounting beam and a rear seat mounting beam. The front seat mounting beam has reinforcing members at both ends for fixing to the sill beam, and the rear seat mounting beam has reinforcing plates at both ends for fixing to the sill beam.

[0009] Furthermore, the battery pack mounting beam has connecting plates at both ends for fixing to the sill beam.

[0010] Furthermore, one side of the sill beam is provided with a support plate along the horizontal direction for supporting the front seat mounting beam and the battery pack mounting beam.

[0011] Furthermore, the battery pack mounting frame includes a central crossbeam, a central longitudinal beam, and front and rear side beams. The battery pack mounting beam and the front and rear side beams are connected in pairs to form a rectangular frame. The central crossbeam and the central longitudinal beam are arranged intersectingly between the battery pack mounting beam and the front and rear side beams.

[0012] Furthermore, both the battery pack mounting beam and the middle crossbeam of the battery pack are provided with multiple cavities to increase their vertical stiffness.

[0013] Furthermore, an overlap member is provided between the battery pack mounting beam and the middle crossbeam of the battery pack, and the overlap member connects the battery pack mounting beam and the middle crossbeam of the battery pack together.

[0014] Furthermore, the battery pack mounting beam is provided with a mounting part for fixing the sill beam, and the connection between the mounting part and the battery pack mounting beam is rounded to increase the vertical distance between the sill beam and the battery pack mounting beam.

[0015] In summary, the present invention has at least one of the following beneficial effects: the upper force transmission path system and the lower force transmission path system are connected together by a sill beam, the upper force transmission path system and the lower force transmission path system have matching stiffness, which can reduce the possibility of battery pack damage when subjected to impact. The sill beam adopts an upper stiff and lower weak approach, which can reduce the deformation of the sill beam when subjected to impact, and at the same time can also avoid the sill being too stiff and not deforming, directly pressing against the deformation of the battery pack, which would cause the amount of cell intrusion to increase. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0017] Figure 2 This is a side view of an embodiment of the present invention;

[0018] Figure 3 This is a structural schematic diagram of the door sill beam;

[0019] Figure 4 This is a schematic diagram of the downward force transmission path system;

[0020] Figure 5 A structural diagram of the crossbeam for mounting the battery pack;

[0021] Figure 6 A schematic diagram of the structure for installing a crossbeam in front of the front seats;

[0022] Figure 7 A schematic diagram of the structure for installing a crossbeam behind the front seats;

[0023] Figure 8 This is a structural diagram of the crossbeam in the middle of the battery pack;

[0024] Figure 9 A schematic diagram showing the connection between the battery pack mounting beam and the middle crossbeam of the battery pack;

[0025] Figure 10 Schematic diagram of the lap joint Figure 1 ;

[0026] Figure 11 Schematic diagram of the lap joint Figure 2 .

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Upward force transmission path system; 11. Battery pack mounting beam; 111. Connecting plate; 12. Front seat front mounting beam; 121. Reinforcing component; 13. Front seat rear mounting beam; 131. Reinforcing plate; 2. Downward force transmission path system; 21. Battery pack mounting beam; 22. Battery pack middle beam; 23. Battery pack middle longitudinal beam; 24. Battery pack front and rear side beams; 25. Overlapping component; 26. Mounting part; 3. Sill beam; 31. Vertical rib; 32. Horizontal rib; 33. Outer cavity; 34. Inner cavity; 35. Support plate. Detailed Implementation

[0029] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0030] The following is in conjunction with the appendix Figure 1-11 The present invention will be described in further detail below.

[0031] This invention discloses a vehicle body structure for impact damage from a side pillar. (Refer to...) Figure 1-11The vehicle side pillar impact structure includes an upper force transmission path system 1, a lower force transmission path system 2, and a sill beam 3 for connecting the upper force transmission path system 1 and the lower force transmission path system 2. The upper force transmission path system includes a front seat mounting beam and a battery pack mounting beam 11 arranged side by side. The lower force transmission path system 2 includes a battery pack mounting beam 21 and a battery pack mounting frame for mounting the battery pack mounting beam 21. The upper side of the sill beam 3 is fixed to the same end of the front seat mounting beam and the battery pack mounting beam 11 by welding, and the lower side of the sill beam 3 is fixed to the battery pack mounting beam 21 by bolts.

[0032] After installation, the stiffness of the uploading force path system 1 and the downloading force path system 2 is matched. During the collision, the uploading force path system 1 and the downloading force path system 2 deform vertically in a manner of overall crushing. If the stiffness of the uploading force path system 1 is too weak, the sill beam 3 will deflect upward; if the downloading force path system 2 is too weak, the sill beam 3 will deflect downward. Both of these situations will lead to system instability, thereby increasing the intrusion.

[0033] The sill beam 3 has several vertical ribs 31 and horizontal ribs 32, which divide the sill beam 3 into an outer cavity 33 and an inner cavity 34. The density of the vertical ribs 31 and horizontal ribs 32 in the outer cavity 33 is lower than that in the inner cavity 34, making the stiffness of the inner cavity 34 greater than that of the outer cavity 33. The bottom plate of the outer cavity 33 is arched upward in an arc shape to form a crush induction structure. The vertical ribs 31 on the bottom plate of the inner cavity 34 are offset towards the inner cavity 34. By adopting an upper stiffness and lower weakness approach for the stiffness of the sill beam 3, the upper stiffness is stronger to minimize the deformation of the entire sill beam 3, while the lower stiffness is weaker to prevent the sill beam 3 from being too stiff and deforming directly against the battery pack, which would increase the amount of cell intrusion. The lower outer end of the sill beam 3 adopts an induction design, which induces the lower inner end of the sill beam 3 to bulge downward during the collision to ensure that the sill beam 3 as a whole is in a crush deformation mode.

[0034] In this embodiment, three horizontal ribs 32 are arranged horizontally, dividing the entire cavity into four parts from top to bottom. Vertical ribs 31 divide the cavity into an inner cavity 34 and an outer cavity 33. The vertical ribs 31 dividing the cavity into the inner cavity 34 and the outer cavity 33 are divided into three segments from bottom to top. The middle vertical rib 31 is shifted towards the inner cavity 34, causing the vertical ribs 31 dividing the cavity into the inner cavity 34 and the outer cavity 33 to be staggered. The inner cavity 34 and the outer cavity 33 are... The misalignment gap between the vertical ribs 31 between the side cavities 33 is no more than 8mm. The stiffness of the misalignment gap must ensure that the misalignment gap area does not deform during the entire collapse stage, thereby inducing the bottom plate of the inner cavity 34 to arch downward. The inner cavity 34 is provided with vertical ribs 31 in the upper two cavities to divide the cavity into two parts. The vertical ribs 31 are located in the middle of the upper cavity, so that the inner cavity 34 has six cavities and the outer cavity 33 has five cavities.

[0035] The front seat mounting beams include a front seat front mounting beam 12 and a front seat rear mounting beam 13 arranged side by side. The battery pack mounting beam 11 is located between the front seat front mounting beam 12 and the front seat rear mounting beam 13. The front seat front mounting beam 12 has reinforcing members 121 at both ends for fixing to the sill beam 3. The front seat rear mounting beam 13 has reinforcing plates 131 at both ends for fixing to the sill beam 3. The battery pack mounting beam 11 has connecting plates 111 at both ends for fixing to the sill beam 3. The reinforcing members 121, reinforcing plates 131 and connecting plates 111 are all fixed to the sill beam 3 by spot welding. The front seat front mounting beam 12, the battery pack mounting beam 11 and the front seat rear mounting beam 112 adopt an offset design for cross-sectional stiffness, and are internally configured with at least two chambers of uneven size to maximize the stiffness of the central collision area without increasing weight.

[0036] A support plate 35 is provided on one side of the sill beam 3 in the horizontal direction to support the front seat mounting beam 12 and the battery pack mounting beam 21. The reinforcing member 121, the reinforcing plate 131 and the connecting plate 111 are welded to the top of the sill beam 3. The support plate 35 is located on the inner side of the sill beam 3 near the top. The ends of the front seat mounting beam and the battery pack mounting beam 11 abut against the inner side of the sill beam 3 and are fixed on the support plate 35. The gap between the battery pack mounting beam 11 and the sill beam 3, excluding the process gap, is minimized as much as possible. The support plate 35 can increase the installation strength of the front seat mounting beam and the battery pack mounting beam 11.

[0037] The battery pack mounting frame includes a central crossbeam 22, two central longitudinal beams 23, and front and rear side beams 24. The battery pack mounting beam 21 and the front and rear side beams 24 are connected in pairs to form a rectangular frame. The central crossbeam 22 and the central longitudinal beams 23 are arranged intersectingly between the battery pack mounting beam 21 and the front and rear side beams 24. The inner cross section of the battery pack mounting beam 21 adopts a multi-cavity design to increase the vertical bending stiffness and avoid excessive bending of the battery pack mounting beam 21 during a collision. The central crossbeam 22 of the battery pack also has multiple cavities inside to increase its own vertical stiffness.

[0038] An overlap member 25 is provided between the battery pack mounting beam 21 and the battery pack central crossbeam 22. The overlap member 25 includes a first overlap member and a second overlap member arranged vertically. The first overlap member and the second overlap member connect the battery pack mounting beam 21 and the battery pack central crossbeam 22 together. The first overlap member and the second overlap member are fixed to the battery pack mounting beam 21 by surface contact to avoid the contact surface of the battery pack mounting beam 21 breaking and failing during a collision. The first overlap member and the battery pack mounting beam 21 are fixed with 12 bolts, and the second overlap member and the battery pack mounting beam 21 are fixed with 2 bolts. The first overlap member is connected to the battery pack central crossbeam 22 by three bolts. The cross section of the battery pack central crossbeam 22 surrounds the area enclosed by the first overlap member and the second overlap member to prevent the cross section of the battery pack central crossbeam 22 from breaking during a collision, which would cause the battery pack central crossbeam 22 to become unstable.

[0039] The battery pack mounting beam 21 is provided with a mounting part 26 for fixing the sill beam 3. The connection between the mounting part 26 and the battery pack mounting beam 21 is rounded to increase the vertical distance between the sill beam 3 and the battery pack mounting beam 21.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A vehicle side pillar impact structure, characterized in that: The system includes an upper force path system (1), a lower force path system (2), and a sill beam (3) for connecting the upper force path system (1) and the lower force path system (2). The upper force path system includes a front seat mounting beam and a battery pack mounting beam (11) arranged side by side. The lower force path system (2) includes a battery pack mounting beam (21) and a battery pack mounting frame for mounting the battery pack mounting beam (21). The upper side of the sill beam (3) is fixed to the same end of the front seat mounting beam and the battery pack mounting beam (11), and the lower side of the sill beam (3) is fixed to the battery pack mounting beam (21). The upward force path system (1) and the downward force path system (2) are stiffness matched; The threshold beam (3) is provided with a number of vertical ribs (31) and horizontal ribs (32). The vertical ribs (31) and horizontal ribs (32) divide the threshold beam (3) into an outer cavity (33) and an inner cavity (34). The vertical ribs (31) and horizontal ribs (32) in the outer cavity (33) have a lower arrangement density than those in the inner cavity (34). The inner cavity (34) has a higher stiffness than the outer cavity (33). The bottom plate of the outer cavity (33) is arched upward in an arc shape to form a crushing induction structure.

2. The vehicle side pillar impact structure according to claim 1, characterized in that: The vertical ribs (31) located on the bottom plate of the inner cavity (34) are offset towards the inner cavity (34).

3. The vehicle side pillar impact-underbody structure according to claim 1, characterized in that: The front seat mounting beam includes a front seat front mounting beam (12) and a front seat rear mounting beam (13). The front seat front mounting beam (12) has reinforcing members (121) at both ends for fixing to the sill beam (3), and the front seat rear mounting beam (13) has reinforcing plates (131) at both ends for fixing to the sill beam (3).

4. The vehicle side pillar impact-underbody structure according to claim 3, characterized in that: The battery pack mounting beam (11) has connecting plates (111) at both ends for fixing to the sill beam (3).

5. The vehicle side pillar impact structure according to claim 4, characterized in that: The sill beam (3) has a support plate (35) on one side in the horizontal direction for supporting the front seat front mounting beam (12) and the battery pack mounting beam (21).

6. The vehicle side pillar impact structure according to claim 1, characterized in that: The battery pack mounting frame includes a central crossbeam (22), a central longitudinal beam (23), and front and rear side beams (24). The battery pack mounting beam (21) and the front and rear side beams (24) are connected in pairs to form a rectangular frame. The central crossbeam (22) and the central longitudinal beam (23) are arranged in a crisscross pattern between the battery pack mounting beam (21) and the front and rear side beams (24).

7. The vehicle side pillar impact structure according to claim 6, characterized in that: The battery pack mounting beam (21) and the middle crossbeam (22) of the battery pack are both equipped with multiple cavities to increase their vertical stiffness.

8. The vehicle side pillar impact structure according to claim 7, characterized in that: An overlap member (25) is provided between the battery pack mounting beam (21) and the battery pack middle crossbeam (22), and the overlap member (25) connects the battery pack mounting beam (21) and the battery pack middle crossbeam (22) together.

9. The vehicle side pillar impact structure according to claim 8, characterized in that: The battery pack mounting beam (21) is provided with a mounting part (26) for fixing the sill beam (3). The connection between the mounting part (26) and the battery pack mounting beam (21) is rounded to increase the vertical distance between the sill beam (3) and the battery pack mounting beam (21).

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