Electric vehicle body

Abstract

The present invention discloses a body for an electric vehicle, comprising: a side beam coupled to a side surface of a floor panel along a front-to-rear length direction; a rear side member, a portion of a front end of which overlaps a portion of a rear end of the side beam, and extends rearward along the side surface of the floor panel and is coupled thereto; a battery, located at a lower portion of the floor panel, and respectively mounted on the side beam portion at the front end of the rear side member and the overlapping portion of the side beam and the rear side member; a rear extension member, formed to have a lower strength than the side beam and the rear side member, the front end of the rear extension member being connected to the rear end of the rear side member, and extending rearward along the side surface of the floor panel and being coupled thereto.

Description

Technical Field

[0001] The present invention relates to a body for an electric vehicle, which prevents collision energy from being transferred to a high-voltage battery by improving the structure of the rear portion of the body. Background Art

[0002] Current development of internal combustion engine vehicles focuses on protecting the fuel tank's body structure during a rear-end collision. This is because if the fuel tank is damaged and leaks oil, it could cause a vehicle fire, causing significant damage to passengers and those near the accident site.

[0003] Furthermore, electric vehicles don't have a fuel tank, but rather a high-voltage battery. If the battery is damaged in a rear-end collision, the high-voltage battery could also cause a fire. Therefore, protecting the high-voltage battery is crucial in the event of a rear-end collision.

[0004] However, the existing body structure is mainly optimized to protect the fuel tank of the internal combustion engine vehicle, and the high-voltage battery has a different shape from the fuel tank, and the shape and structure of the battery in the vehicle are also different, so the existing body structure cannot be used to properly protect the high-voltage battery.

[0005] Therefore, there is a need for a vehicle body structure that can minimize damage to the high-voltage battery in the event of a rear collision of an electric vehicle.

[0006] The above information disclosed as background technology is only for enhancement of understanding of the background of the invention and should not be regarded as an admission of the prior art already known to a person skilled in the art.

[0007] Prior art literature

[0008] Patent Literature

[0009] (Patent Document 1) KR 10-2019-0021167A Summary of the Invention

[0010] (1) Technical issues to be resolved

[0011] The present invention is proposed to solve the above-mentioned problem, and its object is to provide a body for an electric vehicle that prevents collision energy from being transferred to a high-voltage battery by improving the structure of the rear portion of the body.

[0012] (2) Technical solution

[0013] The electric vehicle body of the present invention for achieving the above-mentioned purpose includes: a side member connected to the side surface of the floor panel along the front-rear length direction; a rear side member, a portion of its front end overlaps with a portion of the rear end of the side member, and extends rearward along the side surface of the floor panel and is connected; a battery is located in the lower part of the floor panel and is respectively mounted on the side member portion at the front end of the rear side member and the overlapping portion of the side member and the rear side member; and a rear extension member formed to have a lower strength than the side member and the rear side member, the front end of the rear extension member is connected to the rear end of the rear side member, and extends rearward along the side surface of the floor panel and is connected.

[0014] A portion of the rear end of the rear side member and a portion of the front end of the rear extension member may overlap and be coupled.

[0015] A spring leaf may be coupled to a bottom surface of an overlapping portion of the rear side member and the rear extension member.

[0016] The vehicle body for an electric vehicle may include a first cross member connected between rear side members on both sides, and a battery mounted at a middle end of the first cross member.

[0017] The electric vehicle body may include a second cross member connected between the rear side members on both sides, and the subframe may be mounted on both ends of the first cross member connected to the rear side members and both ends of the second cross member connected to the rear extension member.

[0018] The first cross member may be coupled to the rear side member at a rear end of an overlapping section between the side member and the rear side member.

[0019] The battery mounting portion may be disposed behind the middle end of the first crossbeam, and the battery mounting bracket may be connected vertically between the battery mounting portion and the battery.

[0020] The battery mounting portion may be configured such that a mounting bracket is separately coupled to the rear surface of the first cross member or a predetermined mounting plane is formed on the rear surface of the first cross member.

[0021] A lower end of the battery mounting bracket may be coupled to a rear end of the battery, and an upper end of the battery mounting bracket may be coupled to a battery mounting portion.

[0022] The vehicle body for an electric vehicle may include: a second cross member connected between the rear extension members on both sides; and a mounting reinforcement member connected between the first cross member and the second cross member.

[0023] The mounting reinforcement member may be connected front-to-back between the battery mounting portion and the front end of the second beam.

[0024] (3) Beneficial effects

[0025] Through the above technical solution, the present invention prevents collision energy from being transferred to the battery by optimizing the body structure at the rear of the vehicle, thereby protecting the battery and preventing fire caused by battery damage, thereby safely protecting passengers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a diagram showing the installation position of a high-voltage battery installed on the lower part of the vehicle body in the present invention.

[0027] Figure 2 This is a diagram showing the vehicle body lower structure in a state where a battery is installed in the present invention.

[0028] Figure 3 and Figure 4 It is a diagram for explaining the side sill and the overlapping section in the vehicle body according to the present invention.

[0029] Figure 5 and Figure 6 It is a diagram for explaining the rear side member and the overlapping section in the vehicle body according to the present invention.

[0030] Figure 7 and Figure 8 It is a diagram for explaining the structure in which the rear side member and the rear extension member are connected in the vehicle body according to the present invention.

[0031] Figure 9 1 is a diagram showing a structure in which a subframe according to the present invention is mounted in a vehicle body.

[0032] Figure 10 1 is a diagram showing a form in which mounting brackets are individually combined as a first embodiment of a battery mounting portion according to the present invention.

[0033] Figure 11 It is a diagram showing a form of forming a mounting plane as a second embodiment of a battery mounting portion of the present invention.

[0034] Figure 12 1 is a diagram showing a state of deformation of each vehicle body section when a collision occurs at the rear portion of the vehicle body according to the present invention.

[0035] Figure 13 It is a diagram for explaining an operation state in which a battery mounting bracket is broken by a subframe when a rear vehicle body collision occurs according to the present invention.

[0036] Description of Reference Numerals

[0037] 10: Center floor panel 20: Rear floor panel

[0038] 100: Side beam 200: Rear side member

[0039] 210: Spring leaf 300: Rear extension member

[0040] 400: First beam 410: Mounting bracket

[0041] 420: Installation plane 500: Second beam

[0042] 600: Install reinforcement member 700: Battery

[0043] 710: Battery mounting bracket 800: Subframe

[0044] OL: Overlapping part M1: Battery mounting point

[0045] M2: Subframe mounting point DETAILED DESCRIPTION

[0046] Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

[0047] Figure 1 1 is a diagram showing the installation position of a high-voltage battery 700 installed at the lower portion of the vehicle body in the present invention. Figure 2 1 is a diagram showing the vehicle body lower structure in a state where the battery 700 is mounted in the present invention.

[0048] 1. Referring to the drawings, a floor panel is installed at a lower portion of a vehicle body and includes a central floor panel 10 at the center of the lower portion of the vehicle body and a rear floor panel 20 connected to the rear of the central floor panel 10.

[0049] Furthermore, a high-voltage battery 700 (hereinafter referred to as “battery”) is mounted on a lower portion of the center floor panel 10 in accordance with the width and length of the center floor panel 10 .

[0050] Therefore, the battery 700 is mounted and fastened to the members constituting the vehicle body at the periphery of the battery 700 , and through this mounting and fixing, the battery 700 can be stably coupled to the vehicle body.

[0051] Figure 3 and Figure 4 1 is a diagram for explaining a side member 100 and an overlapping portion OL in a vehicle body according to the present invention. Figure 5 and Figure 6 1 and 2 are diagrams for explaining the rear side member 200 and the overlapping section OL in the vehicle body according to the present invention. Figure 7 and Figure 8 1 and 2 are diagrams for explaining a structure in which a rear side member 200 and a rear extension member 300 are coupled to each other in a vehicle body according to the present invention.

[0052] like Figure 3 and Figure 4 As shown, the side members 100 are coupled to the side surfaces of the center floor panel 10 along the front-rear length direction.

[0053] For example, one side of the side member 100 is coupled to the outer side of the center floor panel 10. For reference, a reinforcement member having a lattice-shaped cross-sectional structure may be further provided inside the side member 100.

[0054] In addition, if Figure 5 and Figure 6 As shown, a portion of the front end of the rear side member 200 overlaps and is combined with a portion of the rear end of the side member 100 , and the rear side member 200 extends rearward along the side of the rear floor panel 20 connected to the rear end of the center floor panel 10 and is combined.

[0055] For example, one side of the rear side member 200 is coupled to outer sides of the center floor panel 10 and the rear floor panel 20 .

[0056] In particular, in the overlapping section OL where the rear side member 200 and the side sill 100 partially overlap, the front end of the rear side member 200 may be coupled to the side surface of the center floor panel 10 , and the rear end of the side sill 100 may overlap the front end of the rear side member 200 .

[0057] Of course, the rear end of the side member 100 may be coupled to the side of the center floor panel 10 , and the front end of the rear side member 200 may be coupled to overlap on the side thereof.

[0058] For reference, the side surface of the portion connected from the center floor panel 10 to the rear floor panel 20 is formed in a shape curved toward the inside of the vehicle body, so that the front end of the rear side member 200 is formed front-to-rear along the side surface of the center floor panel, and the rear end thereof is formed to be curved along the side surface of the rear floor panel 20.

[0059] In addition, refer to Figure 2 The battery 700 is located at the lower portion of the center floor panel 10 , and the sides of the battery 700 are respectively installed on the side beam 100 portion at the front end of the rear side member 200 and the overlapping portion of the side beam 100 and the rear side member 200 .

[0060] For example, brackets are provided around the sides of the battery 700 , and the brackets are located below the side members 100 and the rear side member 200 , thereby ensuring a mounting point for the battery 700 between the side members 100 and the overlapping section OL.

[0061] Therefore, at least one (battery mounting point) or more is installed in the side member 100 section located at the front end of the overlapping section OL, and at least one (battery mounting point) or more is installed in the overlapping section OL, and preferably, two or more battery mounting points M1 can be set.

[0062] In addition, refer to Figure 7 and Figure 8The rear extension member 300 is formed to have lower strength than the side member 100 and the rear side member 200, and the front end of the rear extension member 300 is connected to the rear end of the rear side member 200. In addition, the rear extension member 300 extends rearward along the side of the rear floor panel 20 and is connected.

[0063] For example, one side of the rear extension member 300 is coupled to the rear outer side of the rear floor panel 20 .

[0064] That is, Figure 2 and Figure 12 As shown, in the present invention, the section from the side member 100 portion at the front end of the overlapping section OL to the rear end of the rear extension member 300 can be divided into a first energy absorbing section, a second energy absorbing section, a first protection section, and a second protection section.

[0065] Therefore, when the rear of the vehicle collides, the rear extension member 300 is crushed and deformed in the first energy absorbing portion, thereby first absorbing the collision energy, because the rear extension member 300 is weaker than the rear side member 200 and the side sill 100 at its front end.

[0066] Furthermore, in the second energy absorbing section, rear side member 200 made of a relatively high strength member compared to rear extension member 300 is provided, so when rear side member 200 is bent and deformed, it additionally absorbs collision energy that cannot be absorbed in the first energy absorbing section.

[0067] On the other hand, the second protection zone is the area where the battery 700 is located, and deformation of this area should be prevented. However, this second protection zone corresponds to the area where the center floor panel 10 and the rear floor panel 20 are curvedly connected, which poses a risk of deformation. Therefore, by constructing an overlapping area OL where the high-strength side sills 100 and rear side members 200 overlap and connect, the strength of this area is improved and deformation is prevented.

[0068] In addition, the first protection section is a section formed by the side sill 100 , and deformation is also prevented by the rigidity of the side sill 100 .

[0069] In this way, the collision energy is prevented from being transferred to the battery 700 by optimizing the structure of the rear portion of the vehicle body, thereby protecting the battery 700 and preventing fire caused by damage to the battery 700, thereby protecting passengers.

[0070] At the same time, refer to Figure 7 、 Figure 8 and Figure 12 In the present invention, a portion of the rear end of the rear side member 200 and a portion of the front end of the rear extension member 300 are overlapped and combined.

[0071] For example, the rear end of the rear side member 200 is coupled to one side of the rear floor panel 20 , and the front end of the rear extension member 300 may be coupled in a form overlapping with the rear end of the rear side member 200 .

[0072] In addition, as another example, the front end of the rear extension member 300 is coupled to the side of the rear floor panel 20 , and the rear end of the rear side member 200 may be coupled in a form overlapping with the front end of the rear extension member 300 .

[0073] In addition, a spring piece 210 may be coupled to a bottom surface of an overlapping portion of the rear side member 200 and the rear extension member 300 .

[0074] Therefore, the overlapping portion of rear side member 200 and rear extension member 300 is strengthened, and when the rear of the vehicle collides, the overlapping portion does not break, thereby preventing deformation of spring leaf 210 and preventing damage to the suspension mechanism supported by spring leaf 210.

[0075] At the same time, refer to Figure 2 In the present invention, the first cross member 400 is connected between the rear side members 200 on both sides, and a battery mounting point M1 for mounting the battery 700 is ensured at the middle end of the first cross member 400 .

[0076] More specifically, both ends of the first cross member 400 are respectively coupled to the left and right rear side members 200 at the rear end of the overlapping section OL, and the middle end portion of the first cross member 400 is coupled in a shape crossing the bottom surface of the floor panel.

[0077] In addition, the battery mounting points M1 of the first beam 400 are respectively provided at two positions between the middle end and both ends of the first beam 400 , so as to mount the battery 700 .

[0078] In addition, the second cross member 500 is connected between the rear extension members 300 on both sides.

[0079] For example, both ends of the second cross member 500 are respectively coupled to the rear extension members 300 on the left and right sides of the rear end of the spring leaf 210 , and the middle end of the second cross member 500 is coupled in a shape that crosses the bottom surface of the rear floor panel 20 .

[0080] Specifically, subframe mounting points M2 to which the subframe 800 is mounted are provided at both ends of the first cross member 400 connected to the rear side member 200 and at both ends of the second cross member 500 connected to the rear extension member 300 .

[0081] That is, Figure 9As shown, both ends of the front portion of the subframe 800 are mounted on both ends of the first cross member 400, and both ends of the rear portion of the subframe 800 are mounted on both ends of the second cross member 500, so that the four corners of the subframe 800 are respectively coupled to the rear side member 200 and the rear extension member 300, so as to stably couple and support the subframe 800 to the vehicle body.

[0082] Here, the first and second cross members 400 and 500 may have a structure in which bracket portions coupled to both ends of the rear side member 200 and the rear extension member 300 and a member portion formed at a middle end along a length direction are integrally formed.

[0083] In addition, as another example of the first crossbeam 400 and the second crossbeam 500 , the bracket portion and the member portion may be provided as separate components, respectively.

[0084] At the same time, refer to Figure 2 and Figure 13 In the present invention, the battery mounting portion may be disposed behind the middle end of the first beam 400 , and the battery mounting bracket 710 may be connected vertically between the battery mounting portion and the battery 700 .

[0085] More specifically, a lower end of the battery mounting bracket 710 is coupled to the rear end of the battery 700 , and an upper end of the battery mounting bracket 710 is coupled to the battery mounting portion.

[0086] Therefore, not only the battery 700 can be installed in the side member 100 and the overlapping section OL, but also the battery 700 can be installed in the first cross member 400 , so that the battery 700 can be fastened and supported more stably.

[0087] in addition, Figure 10 1 is a diagram showing a form in which a mounting bracket 410 as a first embodiment of a battery mounting portion according to the present invention is separately combined. Figure 11 1 is a diagram showing a form of forming a mounting plane 420 as a second embodiment of a battery mounting portion of the present invention.

[0088] Reference Figure 10 , the battery mounting portion may be configured such that the mounting bracket 410 is separately coupled to the rear of the first beam 400 .

[0089] Reference Figure 11 , the battery mounting portion may be configured to form a predetermined mounting plane 420 behind the first beam 400 in a shape facing the second beam 500 .

[0090] That is, the battery mounting portion as the battery mounting point M1 where the battery 700 is mounted may be coupled to the first beam 400 in the form of a separate bracket to mount the battery 700 , or may be integrally formed with the first beam 400 to mount the battery 700 .

[0091] At the same time, refer to Figure 2 and Figure 13 In the present invention, the installation reinforcement member 600 may be connected between the first beam 400 and the second beam 500 .

[0092] In this manner, the mounting reinforcement member 600 has a structure that connects the battery mounting portion and the front end of the second beam 500 front-to-back.

[0093] That is, the mounting reinforcement member 600 is connected between the first cross member 400 and the second cross member 500 , thereby ensuring the rigidity of the floor panel between the first cross member 400 and the second cross member 500 .

[0094] In particular, the mounting reinforcement member 600 is connected to the battery mounting portion, which is the battery mounting point M1 on the first cross member 400 , and since the battery mounting portion is physically reinforced, the battery 700 is more securely mounted.

[0095] That is, the battery 700 is securely mounted at the battery mounting point M1 located between the side member 100 and the overlapping section OL, and the battery 700 is also securely mounted in the battery mounting portion, which enables the battery 700 to be mounted more securely than the strength of the battery mounting bracket 710 .

[0096] Therefore, if Figure 13 As shown, when the rear of the vehicle collides, since the battery 700 is firmly mounted as a whole in each battery mounting point M1, when the subframe 800 hits the battery mounting bracket 710, the battery mounting bracket 710 does not bend or bend, but breaks quickly, so that the rear end of the battery 700 does not break in any direction and maintains its original state.

[0097] As described above, the present invention prevents collision energy from being transferred to the battery 700 by optimizing the vehicle body structure at the rear, thereby protecting the battery 700 and preventing fire caused by damage to the battery 700 and protecting passengers.

[0098] On the other hand, although the present invention has been described in detail with respect to the above specific embodiments, it is obvious to those skilled in the art that various modifications and variations can be made within the scope of the technical idea of ​​the present invention, and such modifications and variations belong to the claims.

Claims

1. A body for an electric vehicle, comprising: side members, which are bonded to the sides of the floor panel along its fore-aft length; a rear side member having a front end portion overlapping a rear end portion of the side member and extending rearward along a side surface of the floor panel and joined thereto; Batteries are located in a lower portion of the floor panel and are mounted on a side member portion at a front end of the rear side member and on an overlapping portion of the side member and the rear side member; as well as a rear extension member formed to have a lower strength than the side members and the rear side members, the front end of the rear extension member being connected to the rear end of the rear side members and extending and joining to the rear along the side of the floor panel, wherein a portion of the rear end of the rear side member and a portion of the front end of the rear extension member overlap and combine; The spring piece is coupled to the bottom surface of the overlapping portion of the rear side member and the rear extension member.

2. The electric vehicle body according to claim 1, wherein: include: A first cross beam is connected between the rear side members on both sides, and a battery is installed at a middle end of the first cross beam.

3. The electric vehicle body according to claim 2, wherein: include: The second crossbeam is connected between the rear extension members on both sides. The subframe is mounted on both ends of a first cross member connected to the rear side member and on both ends of a second cross member connected to the rear extension member.

4. The electric vehicle body according to claim 2, wherein: The first cross member is coupled to the rear side member at a rear end of an overlapping section between the side member and the rear side member.

5. The electric vehicle body according to claim 2, wherein: The battery installation portion is arranged behind the middle end of the first crossbeam. The battery mounting bracket is connected between the battery mounting portion and the battery in an upper and lower direction.

6. The electric vehicle body according to claim 5, wherein: The battery mounting portion is configured such that a mounting bracket is separately coupled to the rear surface of the first cross member or a predetermined mounting plane is formed on the rear surface of the first cross member.

7. The electric vehicle body according to claim 5, wherein: The lower end of the battery mounting bracket is coupled to the rear end of the battery, and the upper end of the battery mounting bracket is coupled to the battery mounting portion.

8. The electric vehicle body according to claim 2, further comprising: a second cross member connected between the rear extension members on both sides; as well as A reinforcement member is installed and connected between the first cross beam and the second cross beam.

9. The electric vehicle body according to claim 8, wherein: The mounting reinforcement member is connected front-to-back between the battery mounting portion and the front end of the second cross member.

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