Scrum-type side sill structure for electric vehicles

Abstract

To provide a side sill structure for an electric automobile.SOLUTION: A side sill 7 applied to an electric automobile 1 includes a side sill inner 10 positioned on the side face of a center floor 3 forming a bottom of a vehicle body, a side sill outer 20 bonded to the side sill inner 10, and forming an internal space 7-1 of the side sill, and first, second, third and forth scrum members 30a, etc.,30d provided plurally in the length direction of the vehicle in the internal space 7-1 of the side sill.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a side sill structure for electric vehicles, and in particular to a scrum-type side sill structure for electric vehicles that has a direction that is advantageous for supporting lateral loads by strengthening the inside of the side sill with a scrum member that can provide triple bond support when connected to a seat cross member. [Background technology]

[0002] Typically, the demand for longer driving range in electric vehicles is met by increasing the size of high-voltage batteries.

[0003] This is because the electric vehicle can place the high-voltage battery in the lower part of the center floor, rather than in the rear floor, which is a common layout for existing internal combustion engine vehicles. In particular, the lower part of the center floor has structural features that allow for a layout that is advantageous for increasing the size of the high-voltage battery.

[0004] Furthermore, with the rapid growth of the electric vehicle market in recent years, the safety of electric vehicles in side pole collisions (e.g., collisions with utility poles) has also become an issue. This is because if high-voltage batteries, which have a risk of fire due to damage, are installed in the lower part of the center floor, which is the part of an electric vehicle that is most vulnerable to a side pole collision, the increased size of the high-voltage battery increases the risk of damage in a side pole collision and the risk of fire.

[0005] Therefore, electric vehicles need to reduce the risk of damage to the high-voltage battery by incorporating a side pole collision reinforcement structure in line with the increased size of the high-voltage battery.To achieve this, changing the side sills to extruded material type side sills or pressed steel type side sills has the advantage of not requiring changes to the center floor structure.

[0006] For example, the extrusion-type side sill uses aluminum extrusions in a lattice structure in the interior space of the side sill inner / outer (i.e., bracket panel) to enhance the side sill's collision rigidity, while the steel press-type side sill uses multiple steel press parts that are folded and welded together to be fitted in the interior space of the side sill inner / outer (i.e., bracket panel) in a folded structure, allowing the steel press parts to enhance the side sill's collision rigidity.

[0007] Therefore, the electric vehicle uses a center floor and a large-sized high-voltage battery that can extend the driving range, but also applies a side pole collision reinforcement structure that can minimize deformation due to a collision using extruded material type side sills or steel pressed type side sills, thereby responding to the rapidly growing electric vehicle market by extending the driving range and strengthening crash stability.

[0008] However, the extrusion type side sill and the steel press type side sill applied to the side pole collision reinforcement structure of the electric vehicle have the following drawbacks compared to protecting the high-voltage battery by minimizing collision deformation.

[0009] For example, the extrusion-type side sill makes it very difficult to ensure cost competitiveness of electric vehicle bodies due to the high cost of aluminum extrusions, and in particular, since there is no connection between the structures in the lateral cross section, the cross section can only be expanded during a lateral impact in a side pole collision.

[0010] For example, the pressed steel side sill is cost-competitive compared to aluminum extrusions, but the weight increases significantly due to the large number of pressed steel parts and their welding, which increases the weight of the body of the electric vehicle. In particular, since the pressed steel side sill has a direction that is favorable for supporting vertical loads, it is vulnerable to lateral impacts in side pole collisions. Furthermore, since the pressed steel parts have a greater cross-sectional deformation than aluminum extrusions, it is disadvantageous in terms of collision energy support performance.

[0011] Above all, the extrusion-type side sill and the pressed steel side sill prevent the transmission of loads during a side pole collision because the internal structure of the side sill is not connected to the seat cross member. Here, the seat cross member is a lateral member within the center floor, and is a component of the vehicle body that supports the lateral deformation of the side sill. Summary of the Invention [Problem to be solved by the invention]

[0012] Therefore, in consideration of the above points, the present invention aims to provide a scrum-type side sill structure for electric vehicles that is advantageous for supporting the impact energy applied by the lateral impact of a side pole collision by providing a directionality that is advantageous for supporting lateral loads using a scrum member that has a lateral cross-sectional structure with inter-structural connections of welded-connected parts and a rigid cross-sectional structure that is continuously arranged in the lateral direction, and in particular, is advantageous for supporting the impact energy applied by the lateral impact of a side pole collision by connecting the scrum member to the seat cross member via the side sill, thereby enabling continuous load transmission using a triple-connection support structure. [Means for solving the problem]

[0013] The scrum-type side sill structure of the present invention, which is intended to achieve the above-mentioned objectives, is characterized by including a side sill inner located on the side of the center floor that forms the bottom of the vehicle body, a side sill outer connected to the side sill inner and forming the internal space of the side sill, and first, second, third, and fourth scrum members provided in the internal space of the side sill in the longitudinal direction of the vehicle.

[0014] In a preferred embodiment, the side sill inner, the side sill outer, and the scrum member are fixed by welding, and in particular, the scrum member is fixed to the side sill inner by welding.

[0015] In a preferred embodiment, the first, second, third, and fourth scrum members are arranged adjacent to one another in the longitudinal direction of the vehicle, and each of the first, second, third, and fourth scrum members comprises an upper bracket and a lower bracket that form the interior space of the scrum.

[0016] In a preferred embodiment, the first scrum member, the second scrum member, the third scrum member, and the fourth scrum member are divided into a front scrum member and a rear scrum member when adjacent members are joined together to form an upper joint portion and a lower joint portion, the upper joint portion being a triple joint between the upper bracket of the front scrum member and the upper bracket and lower bracket of the rear scrum member, and the lower joint portion being a triple joint between the upper bracket and lower bracket of the front scrum member and the lower bracket of the rear scrum member.

[0017] In a preferred embodiment, the upper and lower joints are formed at side portions where the upper bracket and the lower bracket abut against each other, and the triple joint is fixed by welding.

[0018] In a preferred embodiment, the upper bracket and the lower bracket are fastened together by a pipe nut that is vertically erected in a straight line length to form an internal space of the scrum.

[0019] In a preferred embodiment, the upper bracket has a left bent wing body and a right bent wing body, with a nut fastening portion where the upper part of the pipe nut is fastened as an intermediate section, and the lower bracket has a left vertical wing body and a right vertical wing body, with a nut fastening portion where the lower part of the pipe nut is fastened as an intermediate section, and the left bent wing body and the left vertical wing body, and the right bent wing body and the right vertical wing body are interlocked with each other.

[0020] In a preferred embodiment, the upper bracket is connected to the side sill inner by having the left bent wing body and the right bent wing body protrude beyond the nut fastening portion, and the lower bracket is connected to the side sill inner by the nut fastening portion.

[0021] In a preferred embodiment, the side sill inner and the side sill outer are each formed with a flange portion, and the flange portions are connected to each other to form an internal space of the side sill.

[0022] In a preferred embodiment, a seat cross end is formed on the seat cross member and overlaps with the side sill inner and the scrum member.

[0023] In a preferred embodiment, a side sill end where the side sill inner is located is formed on the center floor, and a high-voltage battery is attached below the side sill end. [Effects of the Invention]

[0024] The scrum-type side sill structure of the present invention, which is applied to an electric vehicle and forms part of the vehicle body, achieves the following functions and effects.

[0025] First, scrum-type side sills can withstand lateral impacts from side pole collisions, thereby enhancing the lateral rigidity of electric vehicle bodies. Second, the scrum members used in scrum-type side sills have a direction favorable for supporting lateral loads and strengthen the interior of the side sill, overcoming the drawbacks of aluminum extrusions, which are weak in lateral impacts, and steel stamping parts, which support vertical loads but are weak in crash energy resistance. Third, the scrum members connect welded components structurally to form a scrum reinforcement pattern with a rigid cross-sectional structure continuously arranged in the horizontal direction, making them suitable for the length and internal structure of the side sill. Fourth, while fulfilling the inherent functions of side sills, scrum-type side sills can improve performance and reduce cost and weight compared to conventional extrusion-type and steel stamping-type side sills. Fifth, the scrum-type side sill has a triple-joint support structure consisting of a scrum member, side sill inner, and seat cross member, enabling a support structure that allows continuous load transfer toward the center floor during a lateral impact from a side pole collision. [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a diagram illustrating the configuration of a scrum-type side sill structure applied to a body frame of an electric vehicle according to the present invention. [Figure 2] FIG. 1 is a configuration diagram of a scrum member applied to a scrum-type side sill structure according to the present invention. [Figure 3] 1 is an example of a horizontal layout of scrum members constituting a scrum member according to the present invention. [Figure 4] 1 is a cross-sectional view of an example of a scrum-type side sill structure that forms the body frame of an electric vehicle according to the present invention. [Figure 5] 1 shows the horizontally arranged and joined state of scrum members for the cross-sectional configuration of a scrum-type side sill structure according to the present invention. [Figure 6] 10 shows a state in which a lateral impact is applied to a side sill of a vehicle body frame due to a side pole collision of the electric vehicle according to the present invention. [Figure 7] 1 is a crash simulation state showing that when a lateral impact is applied to the scrum-type side sill structure according to the present invention, the lateral cross section of the scrum member ensures impact energy support performance. DETAILED DESCRIPTION OF THE INVENTION

[0027] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings, which are merely examples and are not intended to be limiting, as those skilled in the art can realize the present invention in various different forms.

[0028] Referring to FIG. 1, an electric vehicle 1 includes side sills 7 superimposed on lower portions of both left and right sides of a body frame 1-1.

[0029] Specifically, the vehicle frame 1-1 includes a vehicle-shaped body, a center floor 3 that forms the bottom surface of the body, and a seat cross member 5 (see FIG. 4). As an example, the vehicle-shaped body is a part that forms the framework of the vehicle body, the center floor 3 provides a location on its underside where a high-voltage battery 100 is attached, and the seat cross member 5 is a lateral member within the center floor 3 that supports lateral deformation of the side sills 7.

[0030] In particular, steps (see FIGS. 4 to 6) are formed on both the left and right side surfaces of the center floor 3 so that the side sills 7 can be placed thereon.

[0031] Specifically, the side sill 7 is composed of a side sill inner 10, a side sill outer 20, and a scrum member 30, and is characterized by a scrum-type side sill structure in which the scrum member 30 fills the internal space 7-1 of the side sill.

[0032] For example, the side sill inner 10 is welded to a stepped portion of the center floor 3 to be integrated with the center floor 3, and the side sill outer 20 is welded to the side sill inner 10 to be integrated with the side sill inner 10.

[0033] Therefore, the side sill inner 10 and the side sill outer 20 are formed in a "⊂⊃" shape, and are welded to each other by flanges that abut against each other at the top and bottom, forming an internal space 7-1 of the side sill that is filled with the scrum member 30.

[0034] In addition, each of the side sill inner 10 and the side sill outer 20 is perforated with a weld 10-1 forming a welding portion in the transverse direction (i.e., the longitudinal direction of the front / rear vehicle), and in particular, the weld 10-1 of the side sill inner 10 serves as a welding position for a scrum reinforcement pattern (see Figure 5).

[0035] As an example, the scrum member 30 is composed of scrum members a to n (a is 1, n is an integer greater than or equal to 2) arranged continuously in the transverse direction in the internal space 7-1 of the "⊂⊃" side sill formed by welding the side sill inner 10 and the side sill outer 20 together.

[0036] Therefore, the side sill 7 is characterized by a scrum-type side sill structure in which the internal space 7-1 of the side sill is filled with a scrum reinforcement pattern formed by the lateral arrangement of the a-n scrum members 30a, ..., 30n that make up the scrum member 30.

[0037] 2 and 3 illustrate specific configurations of the scrum members 30. In this example, the scrum members 30 are configured as four scrum members 1 to 4, 30a to 30d, instead of n scrum members 30a to 30n, i.e., the a to n scrum members 30a to 30n, but the number may be changed to an appropriate number depending on the lateral length of the side sill 7 or the difference in rigidity required for the side sill.

[0038] Therefore, the scrum members 30 are composed of a first scrum member 30a, a second scrum member 30b, a third scrum member 30c, and a fourth scrum member 30d, and each of the first to fourth scrum members 30a, 30b, 30c, and 30d is made of the same scrum member components and is welded together adjacent to each other to form a lateral scrum member connection structure.

[0039] Referring to the scrum member components in FIG. 2, each of the first to fourth scrum members 30a, 30b, 30c, and 30d includes an upper bracket 31, a lower bracket 34, and a pipe nut 37.

[0040] For example, the upper bracket 31 is made of a plate material of a predetermined thickness, and the left portion of the nut fastening portion 32 forming a flat middle section is bent in two steps to form a left bent wing body 33-1, and the right portion is bent in two steps to form a right bent wing body 33-2. At this time, the nut fastening portion 32 forms a welding portion by positioning the upper portion of the pipe nut 37 in a drilled welding hole.

[0041] Therefore, the upper bracket 31 has left and right folded wing bodies 33-1, 33-2 that form a bent structure in an approximately "3" shape with the nut fastening portions 32, 35 as the intermediate section, thereby strengthening the rigidity of the upper bracket 31, and the weld portion 10-1 of the side sill inner 10 and the seat cross end 5-1 (see Figure 4) of the seat cross member 5 are positioned on the flat upper surface portion of the two-stage folded structure of the left and right folded wing bodies 33-1, 33-2 to form a welded portion.

[0042] For example, the lower bracket 34 is made of a plate material of a predetermined thickness, and the left portion of the nut fastening portion 35 forming a flat middle section is bent at a right angle to form a left vertical wing body 36-1, and the right portion is bent at a right angle to form a right vertical wing body 36-2. At this time, the nut fastening portion 35 forms a welding portion by positioning the lower portion of the pipe nut 37 in a drilled welding hole.

[0043] Therefore, the lower bracket 34 has a substantially "U"-shaped vertical linear structure with the left and right vertical wing bodies 36-1 and 36-2 having the nut fastening portion 35 as the intermediate section, which facilitates connection to the left and right folded wing bodies 33-1 and 33-2 of the upper bracket 31.

[0044] As an example, the pipe nut 37 has an upper portion positioned in a welding hole drilled in the nut fastening portion 32 of the upper bracket 31 and welded to the nut fastening portion 32, and a lower portion positioned in a welding hole drilled in the nut fastening portion 35 of the lower bracket 34 and welded to the nut fastening portion 35.

[0045] Therefore, the pipe nut 37 is a normal pipe nut, but has a predetermined length so that the upper bracket 31 and the lower bracket 34 are spaced apart to form the internal space 39 of the scrum, and the predetermined length is set in accordance with the internal space 7-1 of the side sill.

[0046] In this way, the upper bracket 31 and the lower bracket 34 are composed of a first scrum member 30a, a second scrum member 30b, a third scrum member 30c, and a fourth scrum member 30d, which form an internal space 39 of the scrum with pipe nuts 37 welded together, and the first scrum member 30a, the second scrum member 30b, the third scrum member 30c, and the fourth scrum member 30d are arranged adjacent to each other in the horizontal direction and form a single integrated first to fourth scrum members 30a, 30b, 30c, 30d.

[0047] 3, the connection structure of the lateral scrum member is formed so that the left and right sides of the lower bracket 34 are offset and engaged with the left and right sides of the upper bracket 31 below the upper bracket 31. In this case, the offset engagement structure means that the left side of the lower bracket 34 fits inside the left side of the upper bracket 31, and the right side of the upper bracket 31 fits inside the right side of the lower bracket 34.

[0048] As an example, the connection structure of the lateral scrum member is such that the left bent wing body 33-1 of the upper bracket 31 wraps around the left vertical wing body 36-1 of the lower bracket 34, and the right vertical wing body 36-2 of the lower bracket 34 wraps around the right bent wing body 33-2 of the upper bracket 31, so that the upper bracket 31 and the lower bracket 34 are offset from each other.

[0049] In the first to fourth scrum members 30a, 30b, 30c, and 30d, the left and right ends of the first scrum member 30a and the fourth scrum member 30d are integrated into a structure for a scrum reinforcement pattern by having the left bent wing body 33-1 of the upper bracket 31 wrap around and weld to the left vertical wing body 36-1 of the lower bracket 34 from the outside, and the right end of the fourth scrum member 30d is integrated into a structure for a scrum reinforcement pattern by having the right vertical wing body 36-2 of the lower bracket 34 wrap around and weld to the right bent wing body 33-2 of the upper bracket 31 from the outside.

[0050] Furthermore, among the first to fourth scrum members 30a, 30b, 30c, and 30d, the first scrum member 30a, the second scrum member 30b, the third scrum member 30c, and the fourth scrum member 30d, which are adjacent to each other, form an upper joint portion of the upper portion and a lower joint portion of the lower portion with respect to the side sill inner 10.

[0051] For example, the connection between the first scrum member 30a and the second scrum member 30b is formed by welding the first scrum member right connector of the first scrum member 30a and the second scrum member left connector of the second scrum member 30b together. That is, the first scrum member right connector is formed by welding the right vertical wing body 36-2 of the lower bracket 34 of the first scrum member 30a to the right folded wing body 33-2 of the upper bracket 31 from the outside. The second scrum member left connector is formed by welding the left folded wing body 33-1 of the upper bracket 34 to the left vertical wing body 36-1 of the lower bracket 34 from the outside.

[0052] For example, the connection between the second scrum member 30b and the third scrum member 30c is formed by welding the second scrum member right connection portion of the second scrum member 30b and the third scrum member left connection portion of the third scrum member 30c together. That is, the second scrum member right connection portion is formed by welding the right vertical wing body 36-2 of the lower bracket 34 of the second scrum member 30b to the right folded wing body 33-2 of the upper bracket 31 from the outside. The third scrum member left connection portion is formed by welding the left folded wing body 33-1 of the upper bracket 34 to the left vertical wing body 36-1 of the lower bracket 34 from the outside.

[0053] For example, the connection between the third scrum member 30c and the fourth scrum member 30d is formed by welding the third scrum member right connection portion of the third scrum member 30c and the fourth scrum member left connection portion of the fourth scrum member 30d together. That is, the third scrum member right connection portion is formed by welding the right vertical wing body 36-2 of the lower bracket 34 of the third scrum member 30c to the right folded wing body 33-2 of the upper bracket 31 from the outside. The fourth scrum member left connection portion is formed by welding the left folded wing body 33-1 of the upper bracket 34 to the left vertical wing body 36-1 of the lower bracket 34 from the outside.

[0054] As a result, when adjacent scrum members in the horizontal arrangement of the first to fourth scrum members 30a, 30b, 30c, 30d are divided into front scrum members and rear scrum members, the upper joint portion forms a triple joint with the upper bracket 31 of the front scrum member (e.g., the first scrum member 30a) and the upper bracket 31 and lower bracket 34 of the rear scrum member (e.g., the second scrum member 30b), and the lower joint portion forms a triple joint with the upper bracket 31 and lower bracket 34 of the front scrum member (e.g., the first scrum member 30a) and the lower bracket 34 of the rear scrum member (e.g., the second scrum member 30b).

[0055] Therefore, the scrum member 30 is composed of a plurality of first to fourth scrum members 30a, 30b, 30c, and 30d that fill the internal space 7-1 of the side sill in the transverse direction, and in the transverse cross section, they are integrally fixed by the upper joints of the upper sections and the lower joints of the lower sections, forming a scrum reinforcement pattern in which each of the scrum members is adjacent to and connected to each other. In particular, the scrum reinforcement pattern contributes to forming a strong support force (f) (see FIG. 7) in the transverse cross section in the vehicle length direction.

[0056] 4 and 5 specifically show the features of the scrum-type side sill structure applied to the side sill 7. FIG.

[0057] Referring to FIG. 4, the side sill 7 is located at a stepped portion of the center floor 3 and is connected to at least one seat cross member 5 by using a seat cross end 5-1 as a welded connection portion.

[0058] In particular, referring to the AA cross section of Figure 4, the side sill 7 has flange portions of the side sill inner 10 and the side sill outer 20 welded together to form an internal space 7-1 of the side sill, and the scrum member 30 is welded to the step portion in the internal space 7-1 of the side sill via the weld portion 10-1 of the side sill inner 10 to be connected to the center floor 3, and is also welded to the seat cross end 5-1 to be connected to the seat cross member 5.

[0059] Referring to Figure 5, the first to fourth scrum members 30a, 30b, 30c, and 30d are arranged laterally with the same width and height as the internal space 7-1 of the side sill, and the internal space 39 of the scrum forms a continuous lateral rigid cross section.

[0060] In particular, the laterally rigid cross section is formed in a scrum reinforcement pattern similar to the scrum formation in rugby by continuous connections between the structures of the first to fourth scrum members 30a, 30b, 30c, and 30d, and this scrum reinforcement pattern has performance that exceeds the rigidity of the internal / external structures of the side sill (i.e., the scrum members 30 and seat cross member 5), resulting in a laterally rigid cross section (see Figure 7) that is resistant to lateral impacts (F).

[0061] In each of the first to fourth scrum members 30a, 30b, 30c, and 30d, the upper bracket 31 has two welds formed using the flat upper surface portions of the left and right folded wing bodies 33-1 and 33-2, and the lower bracket 34 has two welds formed using the nut fastening portions 35.

[0062] In particular, the welded portion of the upper bracket 31 forms a scrum reinforcement pattern, and the scrum reinforcement pattern is formed by a welded structure in which the welded portion 10-1 of the side sill inner 10, the folded wing bodies 33-1 and 33-2 on the left and right sides of the upper bracket 31, and the seat cross end 5-1 of the seat cross member 5 overlap each other, thereby forming a direct welded connection structure between the inner / outer structure of the side sill (i.e., the scrum member 30 and the seat cross member 5) based on the side sill 7.

[0063] In this way, the scrum reinforcement pattern enables continuous load transfer and structural support through a triple bond between the seat cross member 5, side sill inner 10, and scrum member 30 of the side sill internal structure, which eliminates the drawback of the conventional structure in which the seat cross member 5 and the internal structure of the side sill (i.e., aluminum extrusion or steel press part) are not connected, resulting in disconnection of load transfer.

[0064] 6 and 7 illustrate simulation performance results of the side sill 7 in which the first to fourth scrum members 30a, 30b, 30c, and 30d are applied to the scrum member 30 in a side pole collision test in which the side of the electric vehicle 1 collides with a collision object 200.

[0065] In this case, the simulation performance results of FIGS. 6 and 7 are derived under the following conditions.

[0066] As an example, the scrum-type side sill structure of the electric vehicle 1 includes a side sill inner 10 located on the side of the center floor 3 that forms the bottom of the vehicle body, a side sill outer 20 that is connected to the side sill inner 10 and forms the internal space 7-1 of the side sill, and a scrum member 30 that is provided transversely in the internal space 7-1 of the side sill and forms the transverse cross section of the internal space 7-1 of the side sill with a scrum reinforcement pattern.

[0067] Therefore, the electric vehicle 1 includes a side sill 7 in which the lateral cross section of the internal space 7-1 of the side sill is formed in a scrum reinforcement pattern by a plurality of first, second, third, and fourth scrum members 30a, ..., 30d in the internal space 7-1 of the side sill formed from a side sill outer 20 connected to a side sill inner 10 located on the side of the center floor 3 that forms the bottom of the vehicle body; a center floor 3 that forms the bottom of the vehicle body and to which the side sill 7 is connected at its left and right side portions; a seat cross member 5 that supports lateral deformation of the center floor 3 and is connected to the plurality of first, second, third, and fourth scrum members 30a, ..., 30d; and a high-voltage battery 100 attached to the lower part of the center floor 3.

[0068] In particular, the center floor 3, the seat cross member 5, the side sill inner 10, the side sill outer 20, and the first, second, third, and fourth scrum members 30a, ..., 30d are joined by welding, and the scrum reinforcement pattern forms a triple-joint structure with the first, second, third, and fourth scrum members 30a, ..., 30d arranged adjacent to each other in the transverse direction and positioned in the longitudinal direction of the vehicle.

[0069] In addition, the center floor 3 has side sill ends formed on the left and right sides to which the side sills 7 are connected, and the seat cross member 5 consists of multiple pieces spaced apart from each other, each with a seat cross end 5-1 formed thereon, which are connected to the multiple first, second, third, and fourth scrum members 30a, ..., 30d while overlapping with the side sill inner 10.

[0070] Referring to Figure 6, in the side pole collision test, when a collision object 200 hits the side sill 7, the lateral impact (F) applied by the collision object 200 is distributed to the center floor 3 and seat cross member 5 via the scrum member 30 of the side sill 7, and is then transmitted to the high-voltage battery 100 attached to the bottom of the center floor 3.

[0071] Referring to Figure 7, the side sill 7 has an internal space 7-1 in which the first to fourth scrum members 30a, 30b, 30c, and 30d form a horizontal cross section that is continuous in the horizontal direction, and the horizontal cross section forms a supporting force (f) of the horizontal cross section due to the continuous scrum reinforcement pattern of the structure for the scrum reinforcement pattern (see Figure 3).

[0072] Therefore, the support force (f) of the lateral cross section provides primary energy absorption performance against the lateral impact (F) applied by the collision body 200, thereby preventing the side sill 7 from being pushed toward the high-voltage battery 100.

[0073] In addition, the side sill 7 forms a scrum reinforcement pattern (see Figure 5) with a triple bond structure of the seat cross member 5 / side sill inner 10 / scrum member 30 of the side sill internal structure, and the scrum reinforcement pattern supports the lateral cross sections of the first to fourth scrum members 30a, 30b, 30c, and 30d inside the center floor 3.

[0074] Therefore, the scrum reinforcement pattern realizes secondary energy absorption performance against the lateral impact (F) applied by the collision body 200 through the lateral cross-sectional support structure, thereby further strengthening the energy dispersion and support performance against the lateral cross-sectional support force (f).

[0075] In this way, the scrum-type side sill 7 has a structural scrum reinforcement pattern for the continuous scrum reinforcement pattern of the first to fourth scrum members 30a, 30b, 30c, and 30d, and can have two energy absorption / dispersion and support capabilities due to the scrum reinforcement pattern. This eliminates the structural drawback of the conventional application of aluminum extrusions or steel press parts, where the seat cross member 5 and the internal structure of the side sill are not connected, resulting in a disconnection of load transmission.

[0076] As a result, the simulation results of the side pole collision test proved that the scrum-type side sill 7 reduces the amount of side sill penetration (L) caused by the lateral impact (F) applied by the collision body 200 by approximately 15 to 25% compared to when conventional aluminum extrusions or steel press parts are used, thereby ensuring the safety of the high-voltage battery 100 from the risk of damage.

[0077] As described above, the side sill 7 applied to the electric vehicle 1 according to this embodiment has an internal space 7-1 formed from a side sill outer 20 connected to a side sill inner 10 located on the side of the center floor 3 that forms the bottom of the vehicle body. The internal space 7-1 of the side sill is formed from a side sill outer 20 connected to a side sill inner 10 located on the side of the center floor 3 that forms the bottom of the vehicle body. This has a scrum-type side sill structure in which the lateral cross section of the internal space 7-1 of the side sill is formed in a scrum reinforcement pattern by a plurality of first, second, third, and fourth scrum members 30a, ..., 30d that are connected to each other in a structure for a scrum reinforcement pattern. This ensures a direction that is advantageous for supporting lateral loads by the lateral cross-sectional structure and the rigid cross-sectional structure that is continuously arranged in the lateral direction, which is advantageous for supporting the impact energy applied by the lateral impact of a side pole collision. In particular, the plurality of first, second, third, and fourth scrum members 30a, ..., 30d are connected to the seat cross member 5 via the side sill 7, enabling continuous load transmission by the triple-joint support structure. [Explanation of symbols]

[0078] 1. Electric vehicles 1-1 Body frame 3 Center Floor 5 Seat cross member 5-1 Seat cross end 7 Side sill 7-1 Side sill interior space 10 Side sill inner 10-1 Welded parts 20 Side sill outer 30 Scrum members 30a, ..., 30n Scrum members a to n 31 Upper bracket 32, 35 Nut fastening part 33-1, 33-2 Left and right side bendable wings body 34 Bottom bracket 36-1, 36-2 Left and right vertical wing body 37 Pipe Nut 39 Inner space of the scrum 100 High Voltage Battery 200 Collider

Claims

1. The side sill inner is located on the side of the center floor, which forms the bottom of the vehicle body, and a side sill outer coupled to the side sill inner and forming an internal space of the side sill; a plurality of scrum members provided in the longitudinal direction of the vehicle in the internal space of the side sill, The scrum member is composed of an upper bracket and a lower bracket that form an internal space of the scrum, The scrum members are arranged adjacent to each other, and the adjacent scrum members are divided into a front scrum member and a rear scrum member to form an upper joint portion and a lower joint portion, the upper joint portion forms a joint between the upper bracket of the front scrum member and the upper bracket and the lower bracket of the rear scrum member, A side sill structure for an electric vehicle, wherein the lower joint portion forms a joint between the upper bracket and the lower bracket of the front scrum member and the lower bracket of the rear scrum member.

2. 2. The side sill structure for an electric vehicle according to claim 1, wherein the scrum member is fixed to the side sill inner by welding.

3. 2. The side sill structure of an electric vehicle according to claim 1, wherein the upper and lower coupling portions are formed at side portions where the upper bracket and the lower bracket abut against each other.

4. The side sill structure for an electric vehicle according to claim 1, wherein the connection between the scrams is fixed by welding.

5. The side sill structure for an electric vehicle according to claim 1 , wherein the upper bracket and the lower bracket are fastened together by a pipe nut to form an internal space of the scrum.

6. The upper bracket has a left bent wing body and a right bent wing body, with a nut fastening portion where the upper portion of the pipe nut is fastened as an intermediate section, The lower bracket has a left vertical wing body and a right vertical wing body, with a nut fastening portion where the lower portion of the pipe nut is fastened as an intermediate section, The side sill structure for an electric vehicle according to claim 5, wherein the left bent wing body and the left vertical wing body, and the right bent wing body and the right vertical wing body are interlocked with each other.

7. 7. The side sill structure of an electric vehicle according to claim 6, wherein the left bent wing body and the right bent wing body of the upper bracket are coupled to the side sill inner member by protruding beyond the nut fastening portion.

8. The side sill structure of an electric vehicle according to claim 6, wherein the lower bracket is coupled to the side sill inner by the nut fastening portion.

9. The side sill structure for an electric vehicle according to claim 5, wherein the pipe nut is arranged to stand vertically in the interior space of the scrum with a straight length.

10. The side sill structure for an electric vehicle according to claim 1, wherein the scrum member is connected to a seat cross member located above the center floor.

11. 2. The side sill structure for an electric vehicle according to claim 1, wherein a high-voltage battery is attached to the center floor.

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