Frame for electric vehicle

Abstract

The invention relates to a frame for an electric vehicle. A frame for an electric vehicle according to one embodiment of the present invention has a battery space in which a battery is positioned, and includes: a side frame located at a portion of a periphery of the battery space, including a first hollow portion having a closed cross-section therein, the side frame extends along a first direction, and the first direction is the longitudinal direction of the vehicle; and a reinforcing frame located in the first hollow portion, and at least a portion of the reinforcing frame being in contact with the side frame. The reinforcing frame includes: a first surface parallel to a second direction, the second direction being a height direction of the vehicle; and a second surface extending from the first surface and formed to be in contact with a portion of the side frame, in which the second surface may have a protruding portion protruding in a second direction and a recessed portion recessed in the second direction, respectively.

Description

Technical Field

[0001] The present disclosure relates to a frame for an electric vehicle, and relates to a frame for an electric vehicle of a body-on-frame type electric vehicle, in which a reinforcement frame is located at an inner side portion of a side frame. Background Art

[0002] As one type of vehicle body structure, a non-load-bearing body structure is provided, in which the vehicle body is assembled on a frame, and the vehicle body and frame on the frame can be separated. Non-load-bearing body structures are commonly used in vehicles such as SUVs, trucks, and buses. Non-load-bearing body structures are mainly used in vehicles that can withstand high loads or require traction.

[0003] When a non-load-bearing body-on-frame structure is used in an electric vehicle, the frame's most important role in conventional internal combustion engine vehicles is to support the vehicle's overall load, provide rigidity, and protect passengers in the event of an external collision. However, in electric vehicles, in addition to protecting passengers, protecting the battery is also a very important factor. The battery is typically located on the bottom surface, taking up a large volume and being very heavy.

[0004] Therefore, since a large-capacity battery having the same shape as that of a non-load-bearing body structure used in an internal combustion engine vehicle is installed, protection from collision is difficult and weight is increased.

[0005] In addition, some cars use aluminum extrusions or the like as reinforcement materials in the interior space of the frame, but there is a problem in that this is expensive and may not be completely environmentally friendly.

[0006] Therefore, there is a need for a structure of a frame for an electric vehicle that can solve the above problems.

[0007] (Patent Document 1) Korean Patent Publication No. 10-2022-0122089 (published on September 2, 2022) Summary of the Invention

[0008] Technical issues

[0009] The present disclosure is intended to solve the above-mentioned problems, and one aspect of the present disclosure is to provide a non-load-bearing body type frame structure for an electric vehicle, the frame structure having excellent impact absorption capability against lateral impact in the frame.

[0010] Solution to the problem

[0011] In order to achieve the above-mentioned objectives, in the present disclosure, a frame for an electric vehicle formed as follows is provided.

[0012] According to an embodiment of the present disclosure, a frame for an electric vehicle is provided, which has a battery space defined therein, and a battery is positioned in the battery space, the frame for the electric vehicle including: a side frame located in a portion of a periphery of the battery space, the side frame including a first hollow portion having a closed cross-section formed therein, and the side frame extending in a first direction, which is a longitudinal direction of the vehicle; and a reinforcement frame located in the first hollow portion, wherein at least a portion of the reinforcement frame is in contact with the side frame, wherein the reinforcement frame includes a first surface and a second surface, the first surface being parallel to a second direction, which is a height direction of the vehicle, the second surface being formed to extend from the first surface and in contact with a portion of the side frame, and the second surface having a protruding portion protruding in the second direction and a concave portion recessed in the second direction.

[0013] In addition, the reinforcement frame may be formed to extend in the first direction.

[0014] In addition, the protruding portions and the concave portions may be alternately repeated along the first direction to form a waveform.

[0015] In addition, the frame for the electric vehicle may further include: a side beam located on one side of the side frame in the second direction and having a second hollow portion having a closed cross-section formed therein extending in the first direction; and a reinforcement frame including a curved or curved shape and located in the second hollow portion and continuous in the first direction.

[0016] In addition, a connection angle between the first surface and the second surface may be an obtuse angle.

[0017] In addition, the second surfaces may be formed at both end portions of the first surface in the second direction, and the reinforcement frames may be symmetrical to each other with respect to a third direction, which is a width direction of the vehicle.

[0018] In addition, the reinforcement frame may further include a flange formed parallel to the first surface and extending from the second surface, and the reinforcement frame may be welded and coupled to the side frame at the flange.

[0019] In addition, the side frame may include a first side frame adjacent to the battery space and a second side frame adjacent to the side beam, and the side frame may be formed by combining the first side frame with the second side frame. At least a portion of the first surface may contact the second side frame, and the contact portions may be welded or joined by an adhesive material.

[0020] In addition, the side frames may be formed of aluminum or steel materials.

[0021] In addition, the side frames and the reinforcement frame may be formed of different materials.

[0022] Additionally, the reinforcement frame may be fabricated by bending and forming a single plate material.

[0023] In addition, the plate material may be a steel material having a tensile strength of 980 MPa or more.

[0024] According to another embodiment, a frame for an electric vehicle is provided, which has a battery space defined therein, and a battery is positioned in the battery space. The frame for the electric vehicle includes: a side frame located in a portion of a periphery of the battery space, the side frame including a first hollow portion having a closed cross-section formed therein, and the side frame extending in a first direction, which is the longitudinal direction of the vehicle; and a reinforcing frame located in the first hollow portion and including a surface formed in a second direction, which is the width direction of the vehicle; and a side beam located on one side of the side frame in the second direction and having a second hollow portion having a closed cross-section formed therein to extend in the first direction, wherein the reinforcing frame includes a first surface and a second surface, the first surface is parallel to the second direction, which is the height direction of the vehicle, the second surface is formed to extend from the first surface and contact with a portion of the side frame, and the connection angle between the first surface and the second surface is an obtuse angle.

[0025] Beneficial effects of the present invention

[0026] As described above, in the present disclosure, a frame structure having excellent impact absorption capability with respect to an external collision and excellent strength to bear the weight of the vehicle itself can be provided through the above structure.

[0027] In addition, in the case where the reinforcement is formed of a material such as steel instead of aluminum, there is an advantage of reasonable manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic exploded view of an electric vehicle having a non-load-bearing body structure.

[0029] Figure 2 The structure of the frame for an electric vehicle according to an embodiment of the present disclosure is as follows Figure 1 AA' shows a cross-sectional view of a portion.

[0030] Figure 3a is a partial perspective view of a side frame and a reinforcement frame according to an embodiment of the present disclosure.

[0031] Figure 3b is a cross-sectional view of a side frame and a reinforcement frame according to an embodiment of the present disclosure.

[0032] Figure 4 is a perspective view of a reinforcement frame according to an embodiment of the present disclosure.

[0033] Figure 5 is a perspective view of a side sill according to an embodiment of the present disclosure.

[0034] Figure 6 is a perspective view of a side member according to another embodiment of the present disclosure.

[0035] Figure 7 is a perspective view of a side member according to another embodiment of the present disclosure.

[0036] Figure 8 is a structure of a frame for an electric vehicle according to another embodiment of the present disclosure. Figure 1 AA' shows a cross-sectional view of a portion.

[0037] Figure 9 is a partial perspective view of a side frame and a reinforcement frame according to an embodiment of the present disclosure.

[0038] Figure 10 is a perspective view of a reinforcement frame according to another embodiment of the present disclosure.

[0039] Figure 11 A perspective view of a portion of a conventional side frame.

[0040] Figure 12 Graphs showing force and displacement for supporting strength compared through simulation when external impact is applied in a case of a conventional side frame and a conventional reinforcement frame and in a case of a side frame and a reinforcement frame according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] Hereinafter, specific embodiments of the present disclosure will be described with reference to the accompanying drawings. However, the spirit of the present disclosure is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present disclosure can easily propose other alternative inventions or other embodiments included in the spirit of the present disclosure by adding, changing or deleting other components within the scope of the same spirit, but this will also be considered to be included in the scope of the present disclosure.

[0042] Figure 1 The diagram schematically shows the structure of an electric vehicle, which is a non-load-bearing body structure.

[0043] The electric vehicle having a non-load-bearing body structure includes a frame 1 and a body 3 assembled on the frame. Because it is an electric vehicle, a battery 2 is located inside the frame 1 and occupies a large area.

[0044] Figures 2 to 7A frame for an electric vehicle according to an embodiment of the present disclosure is illustrated.

[0045] Figure 2 is a cross-sectional view illustrating the structure of a frame for an electric vehicle according to an embodiment of the present disclosure, and illustrates Figure 1 A cross-sectional view of a portion AA' of an electric vehicle in which the body, frame, and battery are assembled. Figure 3a is a perspective view of a portion of a side frame and a reinforcement frame according to an embodiment of the present disclosure, Figure 3b is a cross-sectional view of a side frame and a reinforcement frame according to an embodiment of the present disclosure, and Figure 4 is a perspective view of a reinforcement frame according to an embodiment of the present disclosure. Figures 5 to 7 is a perspective view of a side member and a reinforcement frame according to an embodiment of the present disclosure.

[0046] The frame for an electric vehicle according to an embodiment of the present disclosure includes a side frame 10 and a reinforcement frame 20 .

[0047] A battery space S may be defined, in which a battery is positioned. The space in which the battery is positioned is Figure 2 It is not shown in a specific form, but is arbitrarily illustrated to show where the battery exists.

[0048] The side frame 10 may be located in a portion of the periphery of the battery space S, include a first hollow portion 13 having a closed cross section formed therein, and extend in a first direction, which is a longitudinal direction (Y direction) of the vehicle.

[0049] The side frame 10 may be formed to extend along a first direction—the longitudinal direction of the vehicle—about a portion of the periphery of the battery space S. The cross-sectional shape of the side frame 10 in a third direction, which is the width direction (X direction) of the vehicle, may include a first hollow portion 13 with a closed cross section formed therein. As an example, the cross-sectional shape may be polygonal, and the corners of the cross-sectional shape may be rounded. However, embodiments of the present disclosure are not limited to these shapes.

[0050] As an example, the side frame 10 may include a first side frame 11 adjacent to the battery space S and a second side frame 12 adjacent to the side beam 30. The first side frame 11 and the second side frame 12 may be integrally formed by joining them. The joining may be welded, and a first connecting portion W1 may be formed. The first connecting portion W1 may be formed as described above to facilitate production.

[0051] As an example, the side frame 10 can be formed from aluminum or steel. The side frame 10 can be formed from aluminum or steel to provide the weight and support strength required for use in electric vehicles. Steel may be more cost-effective when the side frame 10 is formed from steel. However, the materials for the side frame 10 are not limited to the aforementioned materials and include all commonly known materials used by those skilled in the art.

[0052] The reinforcement frame 20 may be located in the first hollow portion 13 , and at least a portion of the reinforcement frame 20 may be in contact with the side frame 10 .

[0053] For example, the reinforcement frame 20 may include: a first surface 21, which is parallel to a second direction, which is a height direction (Z direction) of the vehicle; and a second surface 22, which is formed to extend from the first surface 21 and contact a portion of the side frame 10, wherein the second surface 22 may have a protruding portion 23a and a recessed portion 23c that protrude and recess along the second direction.

[0054] The reinforcement frame 20 may be formed to extend in the first direction.

[0055] The reinforcement frame 20 is positioned within the first hollow portion 13 within the side frame 10. Upon impact from outside the vehicle, the reinforcement frame 20 is configured to minimize deformation of the side frame 10 and the battery compartment S located therein. The presence of the reinforcement frame 20 in addition to the side frame 10 enhances energy absorption from external impacts. Similar to the side frame 10, the reinforcement frame 20 extends in a first direction, enhancing overall energy absorption in the first direction defined by the side frame 10.

[0056] The reinforcement frame 20 may be formed in the following manner: including a first surface 21 parallel to the height direction of the vehicle and a second surface 22 formed to extend from the first surface 21, and a protrusion 23a and a recessed portion 23c may be provided on the second surface 22. The protrusion 23a and the recessed portion 23c may be repeatedly formed.

[0057] For example, the protruding portion 23a and the recessed portion 23c can be alternately and repeatedly arranged along the first direction to form a waveform. Specifically, the waveform can have a right-angled shape such as a right-angled waveform, and the waveform can be formed into a curve such as a sine waveform, or can be formed into a similar sawtooth waveform. In shapes such as right-angled waveforms, parallel portions can be formed by the protruding portion 23a and the recessed portion 23c, and in shapes such as a sine waveform, the protruding portion 23a and the recessed portion 23c can be formed into shapes such as lines, rather than surfaces, and the boundary between the protruding portion 23a and the recessed portion 23c may be unclear. In addition, in the case of shapes such as sawtooth waveforms, the protruding portion 23a and the recessed portion 23c are formed into shapes such as lines, rather than surfaces, but the boundary between the recessed portion 23c and the protruding portion 23a can be clearly distinguished. However, the shape is not limited to a specific shape.

[0058] The height portion 23b connecting the protruding portion 23a and the concave portion 23c can be formed between the protruding portion 23a and the concave portion 23c, and the shape of the height portion 23b is not limited. The larger the height portion 23b is, the more effective the height portion 23b may be, but the height portion 23b can be changed according to the material and processing method.

[0059] For example, the protruding portion 23 a and the recessed portion 23 c may be formed in a portion or the entire area of the second surface 22 of the reinforcement frame 20 .

[0060] For example, the protruding portion 23a and the recessed portion 23c may be ribs formed by rib processing, and the rib portion 23 may include the protruding portion 23a, the recessed portion 23c, and the height portion 23c. Ribbing processing is low-cost and, in the case of a plate material, can be formed over a relatively large area in a single process, thereby facilitating manufacturing.

[0061] Since the protruding portion 23 a and the recessed portion 23 c are formed on the second surface 22 , when there is an impact in the first direction, an effect of absorbing more impact is provided.

[0062] The reinforcement frame 20 can be formed by bending a single plate. Since the single plate is formed by bending, processing is easy and the joint area is minimized, thus preventing problems such as separation due to impact. The plate forming the reinforcement frame 20 can be made of a steel material with a tensile strength of 980 MPa or higher. To ensure sufficient absorption capacity against external impacts, the reinforcement frame 20 can be formed of a steel material with a tensile strength of 980 MPa or higher. However, the embodiments of the reinforcement frame 20 are not limited to the above materials and processing methods.

[0063] As an example, the side frame 10 and the reinforcement frame 20 can be formed from different materials. They can be made of aluminum or steel, and can also be formed by processing different materials. In the case of the side frame 10, the primary purpose is to provide support during a collision, while the reinforcement frame 20 may need to have energy-absorbing properties in addition to providing support during a collision. Therefore, when the side frame 10 and the reinforcement frame 20 are formed from different materials, this can provide a dual design that can meet different required properties.

[0064] However, the side frame 10 and the reinforcement frame 20 may be made of the same material and are not limited to being made of different materials.

[0065] For example, the reinforcement frame 20 may further include a flange 24 formed parallel to the first surface 21 and extending from the second surface 22 , and the reinforcement frame 20 may be welded and coupled to the side frame 10 at the flange 24 .

[0066] When the reinforcement frame 20 and the side frame 10 are fixed while forming the flange 24, the reinforcement frame 20 and the side frame 10 are fixed by surface contact, thereby providing a more stable fixing effect compared to when there is no flange 24. The reinforcement frame 20 and the side frame 10 may be welded and coupled to form the second coupling portion W2.

[0067] When the reinforcing frame 20 is processed from a plate material and integrally formed, the flange 24 may also be bent and shaped and integrally formed. However, the shape and processing method of the flange 24 are not limited to the above examples.

[0068] In addition, the first surface 21 may contact at least a portion of the second side frame 12 and may be welded or coupled by an adhesive material at the contact portion.

[0069] The first surface 21 may directly absorb external impact by at least partially contacting the second side frame 12 and provide an effect of quickly dispersing the impact transmitted through the second side frame 12. The first surface 21 may be joined by welding or using an adhesive material to form a third joining portion W3.

[0070] According to an embodiment of the present disclosure, the angle (θ) of the portion where the first surface 21 and the second surface 22 are connected may be an obtuse angle. That is, the angle may have a value between 90 degrees and 180 degrees.

[0071] The angle of the reinforcement frame 20 connecting the first surface 21 and the second surface 22 can be formed as an obtuse angle. Compared with the case where the angle of the reinforcement frame 20 is a right angle, when the angle of the reinforcement frame 20 is an obtuse angle, a larger area of the reinforcement frame 20 can be provided, and when formed in this manner, an effect of increasing the area for absorbing external impact can be obtained.

[0072] In addition, the second surfaces 22 may be formed at both end portions of the first surface 21 in the second direction, and the reinforcement frames 20 may be symmetrical to each other with respect to the third direction, which is the width direction of the vehicle.

[0073] For stable energy absorption, the second surfaces 22 may be formed at both ends of the first surface 21 , and the reinforcement frame 20 may be symmetrically formed with respect to the third direction to uniformly distribute energy.

[0074] The frame for the electric vehicle according to the embodiment of the present disclosure may further include a side member 30 and a reinforcement frame 40 .

[0075] The side member 30 may be located at one side of the side frame 10 in the third direction and have a second hollow portion 33 having a closed cross-section formed therein to extend in the first direction.

[0076] The reinforcement frame 40 includes a bent or curved shape, may be disposed in the second hollow portion 33 , and may be continuous in the first direction.

[0077] The side member 30 is a portion located on the vehicle body 3 (see Figure 1 ), and can be located on one side of the side frame 10 in the third direction. As an example, the side member 30 can be located close to the outside of the vehicle in the third direction of the side frame 10. That is, when observing the overall structure of the vehicle, the battery 2 (see Figure 1 ) may be disposed at the innermost portion along the third direction, then the side frame 10 may be disposed, and then the side beam 30 may be disposed. The side beam 30 may have a closed cross section formed therein, and may form a second hollow portion 33. This cross-sectional shape is formed to extend along the first direction.

[0078] For example, the closed cross section may be formed in a polygonal shape, but the embodiment of the closed cross section is not limited thereto and may be formed in a circular pipe shape, or may be formed in a complex cross section having a plurality of closed cross sections.

[0079] In addition, a reinforcement frame 40 including a curved or curved shape may be positioned in the second hollow portion 33. As an example, the reinforcement frame 40 may be configured to include a first reinforcement portion 41 and a second reinforcement portion 42, but embodiments of the reinforcement frame 40 are not limited thereto and may include all shapes, materials, etc., which are positioned in the second hollow portion 33 and help protect the battery and the occupant from external forces in the second direction.

[0080] In addition, the side member 30 may be coupled to the reinforcement frame 40 to provide an effect of more effectively absorbing energy of an impact from a third direction.

[0081] The side beam 30 may include: a first side beam 31; a second side beam 32, the second side beam 32 is connected to the first side beam 31 to form a second hollow portion 33 together with the first side beam 31; and a first side beam flange 34 and a second side beam flange 35, the first side beam 31 and the second side beam 32 are connected to the first side beam flange 34 and the second side beam flange 35.

[0082] The reinforcement frame 40 includes a bent or curved shape, is located in the second hollow portion 33 , is formed to be continuous in the first direction, and contacts at least a portion of the first side member 31 .

[0083] As an example, see Figure 5 A first reinforcement portion 41 and a second reinforcement portion 42 may be formed, and the first reinforcement portion 41 may be disposed in the second hollow portion 33, and one side portion of the first reinforcement portion 41 may be coupled to the first side member 31 to form a first closed cross section. The first reinforcement portion 41 may be coupled to the first side member 31 to form the first closed cross section, thereby improving the mechanical rigidity of the vehicle side member 31.

[0084] The first reinforcement portion 41 may include a first upper portion, a pair of first side portions, and a pair of first lower flanges 43 .

[0085] The first side portion may be connected to the first upper portion at both ends of the first side portion in the height direction. The first upper portion may have a curved shape in the first direction. Protruding surfaces P1 and recessed surfaces P2 may be alternately formed along the first direction, and an inclined surface P3 may be formed between the protruding surfaces P1 and the recessed surfaces P2.

[0086] The first side portion may be formed to extend from the first upper portion and contact the inner surface of the first side member 31. The first reinforcement portion 41 may be bent and formed such that the first side portion and the first lower flange 43 are disposed to intersect each other.

[0087] The first lower flange 43 may be coupled to an inner surface of the first side member 31 .

[0088] The second reinforcement portion 42 may be provided in the second hollow portion 33, and one side of the second reinforcement portion 42 may be coupled to the first reinforcement portion 41 to form a second closed cross section. One side of the second reinforcement portion 42 may be coupled to the first reinforcement portion 41 to form a second closed cross section, thereby improving the mechanical rigidity of the vehicle side member 30.

[0089] The second reinforcing portion 42 may include a second upper portion, a pair of second side portions, and a pair of second lower flanges.

[0090] The second upper portion may have a curved shape in the first direction. Protruding surfaces P1 and recessed surfaces P2 may be alternately formed along the first direction, and inclined surfaces P3 may be formed between the protruding surfaces P1 and the recessed surfaces P2. The second upper portion may be planar. Therefore, when an adhesive or the like is applied to the second upper portion for bonding to the second side member 32, the bonding strength of the second upper portion can be improved, and the bonding and assembly work can be facilitated.

[0091] The second side portions may be connected to both end portions of the second upper portion in the height direction, respectively.

[0092] The second side portion may extend from the second upper portion and may be formed to extend in the second direction to the first side member 31. The second lower flange of the second reinforcement portion 42 may be coupled to the first side portion of the first reinforcement portion 41.

[0093] The first reinforcement portion 41 and the second reinforcement portion 42 may have fitting portions 44 that are fitted and coupled to each other.

[0094] For example, the first reinforcement portion 41 and the second reinforcement portion 42 may have the uneven portion P continuously formed on the entire side member 30 in the first direction.

[0095] By including the uneven portion P, rigidity may be improved without increasing the thickness of a material forming the first reinforcement portion 41 and the second reinforcement portion 42 , such as a steel material.

[0096] As another example, see Figure 6In addition to the first reinforcement portion 41 and the second reinforcement portion 42, a partition portion 45 may also be included. When the partition portion 45 is formed, it can be formed to divide the second hollow portion 33, so that a 2-1 hollow portion 33a and a 2-2 hollow portion 33b can be formed. Furthermore, the first side beam 31 and the second side beam 32 can be formed to stably compress and deform when subjected to an external impact in the third direction. Therefore, the energy absorption capacity generated by the collision energy is further improved. The partition portion 45 can be positioned to contact the first upper portion of the first reinforcement portion 41 and the second lower flange of the second reinforcement portion 42. A curved surface shape in the second direction can also be added to the central portion. Due to the presence of this curved surface shape, the extrusion deformation caused by the impact can be advantageous.

[0097] As another example, refer to Figure 7 , the first reinforcement portion 41 and the second reinforcement portion 42 can be symmetrically formed with the partition portion 45 interposed therebetween. Therefore, the first lower flange 43a of the first reinforcement portion 41 and the second lower flange 43b of the second reinforcement portion 42 can be formed while contacting the partition portion 45.

[0098] The shape and structure of the reinforcing frame 40 are examples and are not limited to the above examples.

[0099] Hereinafter, in the above-described embodiment, the same configuration will be referred to from the above description unless there is a particular difference.

[0100] Figures 8 to 10 A frame for an electric vehicle according to another embodiment of the present disclosure is illustrated.

[0101] Figure 8 The structure of the frame for an electric vehicle according to another embodiment of the present disclosure is along Figure 1 A cross-sectional view of a portion taken along the midline AA', Figure 9 is a perspective view of a portion of a side frame and a reinforcement frame according to an embodiment of the present disclosure, and Figure 10 is a perspective view of a reinforcement frame according to another embodiment of the present disclosure.

[0102] According to another embodiment of the present disclosure, a frame for an electric vehicle has a battery space defined therein, in which a battery is positioned, the frame including: a side frame 10, the side frame 10 being positioned in a portion of a periphery of the battery space S and including a first hollow portion 13, the first hollow portion 13 having a closed cross-section formed therein, and the side frame 10 extending in a first direction, which is a longitudinal direction of the vehicle; and a reinforcement frame 20, the reinforcement frame 20 being positioned in the first hollow portion 13 and including a surface formed in a second direction, which is a longitudinal direction of the vehicle. width direction; and a side beam 30, the side beam 30 is located on one side of the side frame 10 in the third direction and has a second hollow portion 33, the second hollow portion 33 has a closed cross-section formed therein to extend in the first direction, the reinforcement frame 20 includes: a first surface 21, the first surface 21 is parallel to the second direction, the second direction is the height direction of the vehicle; and a second surface 22, the second surface 22 is formed to extend from the first surface 21 and contact a portion of the side frame 10, and the angle (θ) of the portion where the first surface 21 and the second surface 22 are connected may be an obtuse angle.

[0103] Figure 11 The diagram shows the structure of a conventional side frame, and Figure 12 : is a graph illustrating the amount of deformation due to impact in the structure of the embodiment of the present disclosure and the conventional side frame. Specifically, Figure 12 The first embodiment ( Figure 3a ) and the second embodiment ( Figure 9 ) side frame and reinforcement frame connection structure and conventional side frame ( Figure 11 ) for comparison.

[0104] The conventional side frame 10 may have the same shape as the side frame 10 of the present disclosure. In the structure of the reinforcement frame 200, the angle (γ) of the reinforcement frame 200 is formed at a right angle (90 degrees), and the recessed portion 23c and the protruding portion 23a are not formed in the reinforcement frame 200. For example, the first surface 210, the second surface 220, and the flange 240 may be formed, and the angle (γ) between the first surface 210 and the second surface 220 may be formed at a right angle.

[0105] Compared with the present disclosure, the side frame 10 is relatively easily deformed by a collision in the third direction, which may make it difficult to protect a battery of the electric vehicle or protect passengers.

[0106] exist Figure 11 The shapes of the conventional side frame 10 and the reinforcement frame 200 are shown in FIG, and the simulation result values for the conventional shape are shown in FIG. Figure 12 are shown as thin solid lines without any special markings.

[0107] In the context of this disclosure, Figure 3a The resulting value of the side frame 10 and the reinforcement frame 20 of the shown shape is shown as A, and Figure 9 Resultant values of the side frames 10 and the reinforcement frame 20 of the illustrated shapes are shown as C, which are resultant values explained based on the shapes shown in each figure.

[0108] According to each embodiment of the present disclosure, the total weight of the conventional side frame 10 and the reinforcement frame 200 is the same as the weight of the side frame 10 and the reinforcement frame 20. For this reason, the thicknesses of the side frame 10 and the reinforcement frame 20 are adjusted.

[0109] The support strength can be compared based on the point where rapid deformation occurs. As a result of the explanation, according to the result graph including the conventional reinforcement frame 200, an external impact of up to 352.2 KN can be supported, and the deformation at this time is 44.6 mm.

[0110] Referring to the result graph of the side frame 10 and the reinforcement frame 20 according to the embodiment of the present disclosure, an external impact of up to 466.4 KN can be supported, and the deformation at this time is 33.0 mm.

[0111] Referring to the result graph of the side frame 10 and the reinforcement frame 20 according to another embodiment of the present disclosure, it can be seen that an external impact of up to 388.0 KN can be supported, and the deformation at this time is 43.4 mm.

[0112] In both examples, the support strength is greater and the deformation formed is smaller than that formed in the conventional case. Therefore, it can be seen that in the case of the present disclosure, when subjected to an impact in the third direction from outside the vehicle, the amount of deformation is smaller while supporting a greater force.

[0113] That is, it can be seen that the side frame 10 and the reinforcement frame 200 of the present disclosure have improved energy absorption capabilities compared to the conventional side frame 10 and the reinforcement frame 200, thereby providing the effects of enhancing support strength and reducing deformation. Therefore, it is possible to provide a safe vehicle by protecting passengers and batteries.

[0114] While example embodiments have been illustrated and described above, it will be apparent to those skilled in the art that changes and modifications may be made without departing from the scope of the present disclosure as defined by the appended claims.

[0115] Description of Reference Signs

[0116] 1: Frame 2: Battery

[0117] 3: Body S: Battery space

[0118] 10: Side frame 11: First side frame

[0119] 12: Second side frame 13: First hollow portion

[0120] 20: Reinforcement frame 21: First surface

[0121] 22: Second surface 23: Ribbed part

[0122] 23a: protruding part 23b: height part

[0123] 23c: Concave portion 24: Flange

[0124] 30: Side beam 31: First side beam

[0125] 32: Second side beam 33: Second hollow portion

[0126] 34: First beam flange 35: Second beam flange

[0127] 40: Reinforcement frame 41: First reinforcement part

[0128] 42: Second reinforcement portion 43: Reinforcement flange

[0129] 44: Fitting part 45: Partition part

[0130] W1: First connecting portion W2: Second connecting portion W3: Third connecting portion θ: Angle

Claims

1. A frame for an electric vehicle, the frame having a battery space defined therein, a battery positioned in the battery space, the frame for an electric vehicle comprising: a side frame positioned in a portion of a periphery of the battery space, the side frame including a first hollow portion having a closed cross-section formed therein and extending in a first direction, the first direction being a longitudinal direction of the vehicle; as well as a reinforcement frame located in the first hollow portion, wherein at least a portion of the reinforcement frame is in contact with the side frame, wherein the reinforcement frame includes: a first surface parallel to a second direction, the second direction being a height direction of the vehicle; and a second surface formed to extend from the first surface and to contact a portion of the side frame, and The second surface has a protruding portion protruding in the second direction and a concave portion concave in the second direction.

2. The frame for an electric vehicle according to claim 1, wherein The reinforcement frame is formed to extend along the first direction.

3. The frame for an electric vehicle according to claim 2, wherein The protruding portions and the concave portions are alternately repeated along the first direction to form a waveform.

4. The frame for an electric vehicle according to claim 1, further comprising: a side member located at one side of the side frame in the second direction and having a second hollow portion having a closed cross section formed therein to extend in the first direction; as well as A reinforcing frame includes a bent or curved shape and is located in the second hollow portion and is continuous in the first direction.

5. The frame for an electric vehicle according to claim 3, wherein The connection angle between the first surface and the second surface is an obtuse angle.

6. The frame for an electric vehicle according to claim 5, wherein The second surface is formed at both ends of the first surface in the second direction, and The reinforcement frames are symmetrical to each other with respect to a third direction, which is a width direction of the vehicle.

7. The frame for an electric vehicle according to claim 1, wherein The reinforcement frame further includes a flange formed parallel to the first surface and extending from the second surface, and the reinforcement frame is welded and coupled to the side frame at the flange.

8. The frame for an electric vehicle according to claim 4, wherein The side frame includes a first side frame adjacent to the battery space and a second side frame adjacent to the side beam. wherein the side frame is formed by combining the first side frame and the second side frame, and At least a portion of the first surface is in contact with the second side frame, and is welded or joined by an adhesive material at the contact portion.

9. The frame for an electric vehicle according to claim 1, wherein The side frames are formed of aluminum or steel material.

10. The frame for an electric vehicle according to claim 9, wherein The side frames and the reinforcement frame are formed of different materials.

11. The frame for an electric vehicle according to claim 1, wherein The reinforcement frame is manufactured by bending and forming a single plate.

12. The frame for an electric vehicle according to claim 11, wherein The plate material is a steel material having a tensile strength of 980 MPa or more.

13. A frame for an electric vehicle, the frame having a battery space defined therein, a battery positioned in the battery space, the frame for an electric vehicle comprising: a side frame positioned in a portion of a periphery of the battery space, the side frame including a first hollow portion having a closed cross-section formed therein and extending in a first direction, the first direction being a longitudinal direction of the vehicle; a reinforcement frame located in the first hollow portion and including a surface formed along a second direction, the second direction being a width direction of the vehicle; as well as a side member located on one side of the side frame in the second direction and having a second hollow portion having a closed cross section formed therein to extend in the first direction, wherein the reinforcement frame includes: a first surface parallel to the second direction, the second direction being the height direction of the vehicle; and a second surface formed to extend from the first surface and to contact a portion of the side frame, and The connection angle between the first surface and the second surface is an obtuse angle.

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