Lower vehicle body structure of electric vehicle

Abstract

The invention discloses a lower automobile body structure of an electric automobile. The lower automobile body structure comprises an automobile body lower assembly composed of a front cabin assembly, a battery pack assembly and a rear floor assembly. The front cabin assembly comprises a front longitudinal beam wheel cover assembly, and a front baffle lower cross beam is arranged on the front longitudinal beam wheel cover assembly. A battery pack front cross beam, a battery pack side edge beam and a battery pack rear cross beam are arranged on the side wall of the battery pack assembly; the rear floor assembly comprises a rear longitudinal beam wheel cover assembly; a rear floor front cross beam is arranged on the rear longitudinal beam wheel cover assembly; the front baffle lower cross beam is fixed with the battery pack front cross beam through a bolt, and the bolt is fixed with the battery pack rear cross beam through the rear floor front cross beam; the integration is high, the two independent units of the lower vehicle body and the battery pack are combined into a whole, and the number of parts and the weight of the vehicle body are reduced; a front floor assembly is omitted, the vehicle body tool development investment is reduced, and the whole vehicle development cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of automobiles, and in particular to a lower body structure of an electric vehicle. Background Art

[0002] Traditional new energy vehicles have independent lower body assemblies and battery pack assemblies, and the battery pack is installed on the bottom of the vehicle body by bolts. The traditional lower body assembly is composed of the front cabin assembly, the front floor assembly, and the rear floor assembly. The front floor assembly is connected to the front cabin assembly and the rear floor assembly by spot welding, MIG welding, or SPR. The joints are sealed with structural adhesive and PVC, which is not conducive to environmental protection. The lower body assembly and the battery pack are independent of each other, with a large number of parts and heavy weight, which is not conducive to lightweighting of the vehicle body. There is a gap of more than 10mm between the battery pack and the front floor, and the space utilization rate of the whole vehicle is low; the front floor includes left / right floor side beams, the middle channel body, the middle channel extension plate, the front / rear seat cross beams, the front floor body, the left / right rear longitudinal beams of the middle channel, and other structural splicing. This structure of the lower body and the battery pack separation increases the weight of the whole vehicle, which is not conducive to lightweighting of the body, and also increases the manufacturing cost of the vehicle. Summary of the invention

[0003] In order to solve the defects in the prior art that the lower body and the battery pack are separated, which increases the weight of the whole vehicle, is not conducive to the lightweight of the vehicle body, and also increases the manufacturing cost of the vehicle, the present invention provides a lower body structure of an electric vehicle.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0005] The present invention discloses an electric vehicle lower body structure, comprising a lower body assembly consisting of a front cabin assembly, a battery pack assembly and a rear floor assembly; the front cabin assembly comprises a front longitudinal beam wheel cover assembly, and a front fender lower cross beam is disposed on the front longitudinal beam wheel cover assembly; a battery pack front cross beam, a battery pack side beam and a battery pack rear cross beam are disposed on the side wall of the battery pack assembly; the rear floor assembly comprises a rear longitudinal beam wheel cover assembly; and a rear floor front cross beam is disposed on the rear longitudinal beam wheel cover assembly; the front fender lower cross beam is fixed to the battery pack front cross beam via bolts, and the rear floor front cross beam is fixed to the battery pack rear cross beam via bolts.

[0006] As a preferred technical solution of the present invention, the upper surface of the battery pack assembly is surrounded by a silicone foam

[0007] As a preferred technical solution of the present invention, a sealing structure is formed between the silicone foam at the front of the battery pack assembly and the front lower cross beam of the front cabin assembly.

[0008] As a preferred technical solution of the present invention, the front cross beam of the battery pack and the rear cross beam of the battery pack are both profiles and are provided with mounting holes.

[0009] As a preferred technical solution of the present invention, the battery pack side beam is a profile with multi-cavity reinforcement ribs.

[0010] As a preferred technical solution of the present invention, side enclosure assemblies are installed on the side beams on both sides of the battery pack assembly, and the silicone foam on both sides of the upper surface of the battery pack assembly forms a sealing structure with the side enclosure assembly.

[0011] As a preferred technical solution of the present invention, the front cross beam of the rear floor is a U-shaped profile.

[0012] As a preferred technical solution of the present invention, the silicone foam at the rear of the upper surface of the battery pack assembly forms a sealing structure with the front cross beam of the rear floor assembly.

[0013] The beneficial effects of the present invention are:

[0014] This new type of electric vehicle has a highly integrated lower body structure, which combines the two independent units of the lower body and the battery pack into a whole, reducing the number of parts and the weight of the vehicle body; the present invention eliminates the front floor assembly, reduces the investment in vehicle body tooling development, and reduces the cost of vehicle development; after the battery pack replaces the vehicle body floor, the battery pack and the vehicle body form a whole, which improves the bending and torsional stiffness of the vehicle; the space utilization rate is improved, the multi-layer structure space between the battery pack and the vehicle body floor is released, and the vertical riding space in the vehicle is also increased; the vehicle body height is reduced, the drag coefficient is reduced, the body shape is more beautiful, and the handling performance of the vehicle is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a structural schematic diagram of a lower body structure of an electric vehicle according to the present invention;

[0017] Figure 2 It is a structural schematic diagram of the front cabin assembly in the present invention;

[0018] Figure 3 It is a schematic diagram of the structure of the battery pack in the present invention;

[0019] Figure 4 It is a structural schematic diagram of the rear floor assembly of the present invention;

[0020] Figure 5 It is a structural diagram of the connection between the lower cross beam of the front baffle and the front cross beam of the battery pack in the present invention;

[0021] Figure 6This is a structural diagram of the connection between the lower cross beam of the front baffle and the side beam of the battery pack according to the present invention;

[0022] Figure 7 The rear floor assembly and the battery pack rear cross beam connection structure of the present invention;

[0023] Figure 8 It is a connection structure diagram of the side enclosure assembly in the present invention.

[0024] In the figure: 100, lower body assembly; 110, front cabin assembly; 111, front longitudinal beam wheel housing assembly; 112, front fender lower cross beam;

[0025] 120. Battery pack assembly; 121. Front crossbeam of battery pack; 122. Side beam of battery pack; 123. Rear crossbeam of battery pack;

[0026] 130. Rear floor assembly; 131. Rear longitudinal beam wheel housing assembly; 132. Rear floor front cross beam. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] Example: Figures 1 to 8 As shown, the present invention provides an electric vehicle lower body structure, including a lower body assembly 100 consisting of a front cabin assembly 110, a battery pack assembly 120, and a rear floor assembly 130; the front cabin assembly 110 includes a front longitudinal beam wheel cover assembly 111, and a front fender lower cross beam 112 is provided on the front longitudinal beam wheel cover assembly 111; a battery pack front cross beam 121, a battery pack side beam 122, and a battery pack rear cross beam 123 are provided on the side wall of the battery pack assembly 120; and the rear floor assembly 130 includes a rear longitudinal beam wheel cover assembly 131; and a rear floor front cross beam 132 is provided on the rear longitudinal beam wheel cover assembly 131; and the front fender lower cross beam 111 is fixed to the battery pack front cross beam 121 by bolts, and the rear floor front cross beam 132 is fixed to the battery pack rear cross beam 123 by bolts. The present invention has high integration, and the two independent units of the lower body and the battery pack are combined into a whole, thereby reducing the number of parts and the weight of the vehicle body; the present invention eliminates the front floor assembly, reduces the investment in vehicle body tooling development, and reduces the development cost of the entire vehicle; after the battery pack replaces the vehicle body floor, the battery pack and the vehicle body form a whole, thereby improving the bending and torsional stiffness of the entire vehicle; the space utilization rate is improved, the multi-layer structure space between the battery pack and the vehicle body floor is released, and the vertical riding space in the vehicle is also increased; the vehicle body height is reduced, the wind resistance coefficient is reduced, the vehicle body shape is more beautiful, and the handling performance of the entire vehicle is improved.

[0029] The upper surface of the battery pack assembly 120 is surrounded by a silicone foam 124, which forms a sealing structure with the front compartment assembly and the rear floor assembly.

[0030] A sealing structure is formed between the silicone foam 124 at the front of the battery pack assembly 120 and the front lower cross beam 111 of the front cabin assembly 110 , thereby ensuring good sealing between the battery pack assembly 120 and the front cabin assembly 110 .

[0031] The battery pack front cross beam 121 and the battery pack rear cross beam 123 are both profiles and are provided with mounting holes for easy docking and installation.

[0032] Among them, the battery pack side beam 121 is a profile with multi-cavity reinforcement ribs.

[0033] The side panel assemblies 200 are installed on the side beams on both sides of the battery pack assembly 120 , and the silicone foam 124 on both sides of the upper surface of the battery pack assembly 120 forms a sealing structure with the side panel assemblies 200 .

[0034] The rear floor front cross beam 132 is a U-shaped profile.

[0035] The silicone foam 124 at the rear of the upper surface of the battery pack assembly 120 forms a sealing structure with the front cross beam 132 of the rear floor assembly.

[0036] The lower body structure of this new type of electric vehicle, the lower body assembly 100 is composed of a front cabin assembly 110, a battery pack assembly 120, and a rear floor assembly 130. The front cabin assembly 110 is composed of a cast aluminum front longitudinal beam wheel cover assembly 111, a front fender lower cross beam 112 and other parts. The left and right longitudinal beam wheel covers in the front longitudinal beam wheel cover assembly 111 are connected by a profile, and the front fender lower cross beam 112 has a flange edge structure sealed with the battery pack assembly 120. The front fender lower cross beam 111 that constitutes the rear part of the front cabin assembly 110 is an aluminum extruded profile, which has a sealing structure with the battery pack assembly 120 and provides a front installation point for the battery pack front cross beam of the battery pack assembly 120. The battery pack assembly 120 is a frame structure, and the front cross beam 121 is a profile with mounting holes connected to the front cabin assembly 110. The side beams 122 of the front cross beam of the battery pack are profiles with multi-cavity reinforcement ribs, and have mounting holes connected to the front cabin longitudinal beam wheel cover 111. The rear cross beam 123 of the battery pack is a profile with mounting holes connected to the rear floor assembly 130. The upper shell of the battery pack assembly 120 is surrounded by silicone foam 124. The silicone foam 124 has the characteristics of large compression and good compression recovery, which ensures the sealing with surrounding parts. The front of the battery pack assembly 120 is connected to the front cabin assembly 110 by bolts. The silicone foam 124 at the front of the battery pack assembly 220 forms a sealing structure with the front lower cross beam of the front cabin assembly to ensure the sealing of the passenger compartment. The side beams on both sides of the battery pack assembly 120 have mounting points connected to the side enclosure assembly 200. The battery pack assembly 120 is connected to the side enclosure assembly 200 by bolts through the mounting points thereon. At the same time, the silicone foam 124 on both sides of the upper part of the upper shell of the battery pack assembly 120 forms a sealing structure with the side enclosure assembly 200 to ensure effective sealing of the passenger compartment. The rear longitudinal beam wheel housing assembly 131 in the rear floor assembly 130 is a cast aluminum part, and the front cross beam 132 of the rear floor is a square profile. The rear of the battery pack assembly 120 is connected to the rear floor assembly 130 by bolts. At the same time, the silicone foam 124 at the rear of the upper shell of the battery pack assembly 120 forms a sealing structure with the front cross beam 132 of the rear floor assembly.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric vehicle lower body structure, characterized in that: The invention comprises a vehicle body lower part assembly (100) composed of a front cabin assembly (110), a battery pack assembly (120), and a rear floor assembly (130); the front cabin assembly (110) comprises a front longitudinal beam wheel cover assembly (111), and the front longitudinal beam wheel cover assembly (111) is provided with a front fender lower cross beam (112); the side wall of the battery pack assembly (120) is provided with a battery pack front cross beam (121), a battery pack side beam ( 122) and a battery pack rear crossbeam (123); the rear floor assembly (130) includes a rear longitudinal beam wheel cover assembly (131); the rear longitudinal beam wheel cover assembly (131) is provided with a rear floor front crossbeam (132); the front baffle lower crossbeam (111) is fixed to the battery pack front crossbeam (121) via bolts, and the rear floor front crossbeam (132) is fixed to the battery pack rear crossbeam (123) via bolts.

2. The lower body structure of an electric vehicle according to claim 1, characterized in that: The upper surface of the battery pack assembly (120) is surrounded by a silicone foam (124).

3. The lower body structure of an electric vehicle according to claim 2, characterized in that: A sealing structure is formed between the silicone foam (124) at the front of the battery pack assembly (120) and the front lower cross beam (111) of the front cabin assembly (110).

4. The lower body structure of an electric vehicle according to claim 1, characterized in that: The battery pack front crossbeam (121) and the battery pack rear crossbeam (123) are both profiles and are provided with mounting holes.

5. The lower body structure of an electric vehicle according to claim 1, characterized in that: The battery pack side beam (121) is a profile with multi-cavity reinforcement ribs.

6. The lower body structure of an electric vehicle according to claim 2, characterized in that: Side enclosure assemblies (200) are installed on the side beams on both sides of the battery pack assembly (120), and the silicone foam (124) on both sides of the upper surface of the battery pack assembly (120) and the side enclosure assembly (200) form a sealing structure.

7. The lower body structure of an electric vehicle according to claim 5, characterized in that: The rear floor front cross beam (132) is a square-shaped profile.

8. The lower body structure of an electric vehicle according to claim 5, characterized in that: The silicone foam (124) at the rear of the upper surface of the battery pack assembly (120) and the front cross beam (132) of the rear floor assembly form a sealing structure.

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