Rear fixing structure for battery pack, and rear floor assembly

Abstract

NOT VISIBLE DUE TO STATUS OF PATENT

Description

A rear mounting structure for a battery pack and a rear floor assembly

[0001] This application claims priority to Chinese Patent Application No. 202510016720.5, filed on January 6, 2025, entitled “A rear fixing structure for a battery pack and a rear floor assembly having the rear fixing structure”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of battery packs, specifically a rear fixing structure for a battery pack and a rear floor assembly having the rear fixing structure. Background Technology

[0003] With the surge in popularity of electric vehicles, more and more new energy vehicles are being developed and produced by OEMs, including even vehicles previously based on traditional gasoline platforms that are gradually being converted to electric power. The addition of a power battery at the bottom of the vehicle, with varying battery sizes, presents new design challenges for vehicle performance, particularly impacting torsional mode and torsional stiffness.

[0004] In related technologies, the car body uses two separate brackets to mount and fix the battery pack at the rear.

[0005] However, with this structure that fixes the rear of the battery pack, the torsional mode and torsional stiffness of the entire vehicle need to be improved. Summary of the Invention

[0006] The purpose of this application is to provide a rear-mounted battery pack structure that facilitates rear-mounted connection of the battery pack and improves the torsional mode and torsional stiffness of the entire vehicle.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0008] A rear fixing structure for a battery pack includes a front crossbeam, a support frame, and an anchor bracket.

[0009] The front crossbeam is connected to the anchor bracket via the support frame;

[0010] The battery pack is connected to the battery pack via the front crossbeam using a rear fixing structure.

[0011] In some feasible implementations, the support frame includes a frame body, which includes a first connecting frame, a second connecting frame, a third connecting frame, and a fourth connecting frame; the first connecting frame, the second connecting frame, the third connecting frame, and the fourth connecting frame are connected in sequence; the first connecting frame and the second connecting frame are intersecting; the second connecting frame and the third connecting frame are intersecting; the third connecting frame and the fourth connecting frame are intersecting; the support frame is W-shaped.

[0012] In some feasible implementations, the frame body is provided with a fitting plane for fitting with the front crossbeam or the anchor point bracket; the frame body is connected to the front crossbeam or the anchor point bracket through the fitting plane.

[0013] In some feasible implementations, the anchor bracket includes two spaced-apart anchor beams, and the battery pack is attached to the rear floor crossbeam of the vehicle body via the anchor bracket using a rear fixing structure; an anchor beam is connected to the connection between the first and second connecting frames and the connection between the third and fourth connecting frames.

[0014] In some feasible implementations, the front crossbeam is used to connect to the rear longitudinal beam body, and both ends of the front crossbeam are respectively connected to the rear longitudinal beam body through an adapter bracket.

[0015] In some feasible implementations, the adapter bracket includes a bracket box that is connected to the rear longitudinal beam body via a support flange.

[0016] In some feasible implementations, the support frame is inclined, and the front crossbeam, the support frame, and the anchor bracket are all made of aluminum alloy.

[0017] In some feasible implementations, both the front crossbeam and the anchor bracket have rectangular cross-sections.

[0018] A rear floor assembly includes a rear floor body, the rear floor body including two spaced and oppositely distributed rear longitudinal beam bodies; a rear floor crossbeam is provided between the two rear longitudinal beam bodies; a rear battery pack rear fixing structure as described above is provided on the rear floor body; both ends of the rear battery pack rear fixing structure are respectively connected to the rear longitudinal beam bodies through an adapter bracket; the rear battery pack rear fixing structure is connected to the rear floor crossbeam through the anchor bracket.

[0019] In some feasible implementations, the two ends of the rear floor beam are respectively connected to the rear longitudinal beam body via a connecting plate.

[0020] The advantages of this application are:

[0021] This application discloses a rear mounting structure for a battery pack and a rear floor assembly having the rear mounting structure. The rear mounting structure for a battery pack disclosed in this application facilitates the connection between the battery pack and the vehicle body. In addition, the use of a front crossbeam, a support frame, and anchor brackets greatly ensures the structural strength of the rear mounting structure for the battery pack.

[0022] Furthermore, the rear of the vehicle is secured with a rear-mounted battery pack structure, which, while meeting the requirements of layout process and cost, can maximize the torsional mode and torsional stiffness of the vehicle, thereby improving the vehicle's NVH performance and operational stability. Attached Figure Description

[0023] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0024] Figure 1 is a schematic diagram of the rear fixing structure for the battery pack in this application;

[0025] Figure 2 is a schematic diagram of the structure of the rear fixing structure of the battery pack in this application when it is connected to the vehicle body;

[0026] Figure 3 is an exploded view of the rear floor assembly in this application;

[0027] Figure 4 is a structural schematic diagram of the adapter bracket in this application;

[0028] Figure 5 is a structural schematic diagram of the rear floor beam in this application;

[0029] Figure 6 is a schematic diagram of the connecting plate in this application.

[0030] The markings in the above figures are as follows: 1. Front crossbeam, 2. Anchor bracket, 3. Support frame, 4. Adapter bracket, 101. Rear fixing structure, 102. Rear floor crossbeam, 103. Connecting plate, 104. Rear longitudinal beam body. Detailed Implementation

[0031] The specific implementation of this application will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0032] As shown in Figure 1, a rear fixing structure 101 for a battery pack (hereinafter referred to as rear fixing structure 101) includes a front crossbeam 1, a support frame 3, and an anchor point bracket 2. The rear fixing structure 101 disclosed in this application facilitates the connection between the battery pack and the vehicle body. In addition, the coordinated use of the front crossbeam 1, the support frame 3, and the anchor point bracket 2 greatly ensures the structural strength of the rear fixing structure 101.

[0033] The rear fixing structure 101 disclosed in this application is mainly used for connecting and installing the battery pack at the rear of the vehicle body.

[0034] The rear fixing structure 101 disclosed in this application mainly includes a front crossbeam 1, a support frame 3, and an anchor bracket 2. The front crossbeam 1 is laterally connected to two rear longitudinal beams at both ends, while the support frame 3 acts as a bridging frame, facilitating the connection between the anchor bracket 2 and the front crossbeam 1. Furthermore, in this application, the anchor bracket 2 is connected to the rear floor crossbeam 102. Based on this design, the rear longitudinal beams, the rear floor crossbeam 102, and the rear fixing structure 101 form a triangular design, which not only ensures the rear structural strength of the rear floor assembly but also guarantees the structural strength of the rear of the vehicle chassis.

[0035] In this application, the front crossbeam 1 is connected to the anchor bracket 2 via the support frame 3. The rear fixing structure 101 is connected to the battery pack via the front crossbeam 1. Based on the above design, the installation and fixing of the battery pack on the vehicle body is facilitated.

[0036] Furthermore, as shown in Figure 1, in this application, the support frame 3 includes a frame body, which is the main structure of the support frame 3. In this application, the frame body includes a first connecting frame 31, a second connecting frame 32, a third connecting frame 33, and a fourth connecting frame 34. The first connecting frame 31, the second connecting frame 32, the third connecting frame 33, and the fourth connecting frame 34 are connected sequentially. The first connecting frame 31 intersects with the second connecting frame 32. The second connecting frame 32 intersects with the third connecting frame 33. The third connecting frame 33 intersects with the fourth connecting frame 34. The support frame 3 is W-shaped. Based on the above design, the support frame 3, the front crossbeam 1, and the anchor bracket 2 work together to form multiple triangular structures, better ensuring the structural strength of the support frame 3 and the rear fixing structure 101.

[0037] Furthermore, in this application, the frame body is provided with a mating plane for engaging with the front crossbeam 1 or the anchor bracket 2. The frame body is connected to the front crossbeam 1 or the anchor bracket 2 through the mating plane. The provision of the mating plane ensures the contact area between the support frame 3 and the front crossbeam 1 or the anchor bracket 2, thereby ensuring the stability of the installation between the frame body and the front crossbeam 1 and the anchor bracket 2.

[0038] Furthermore, as shown in Figures 2-3, in this application, the anchor bracket 2 includes two spaced anchor beams 21, which act as a connector to facilitate the overlapping installation of the anchor beams 21 on the rear floor beam 102 (as shown in Figure 5).

[0039] Meanwhile, in this application, the rear fixing structure 101 is connected to the rear floor crossbeam 102 of the vehicle body via anchor brackets 2. An anchor beam 21 is connected to the connection points of the first link 31 and the second link 32, and the third link 33 and the fourth link 34, respectively. The anchor beam 21 acts as a connector and is located at each link connection point. Based on the above design, the anchor beam 21 can also act as a reinforcing member, better ensuring the structural strength of the rear fixing structure 101.

[0040] Furthermore, as shown in Figures 2 and 3, in this application, both ends of the front crossbeam 1 are connected to the rear longitudinal beam body 104 via an adapter bracket 4. The adapter bracket 4 facilitates the connection between the front crossbeam 1 and the rear longitudinal beam body 104, and also acts as a suspension beam, allowing for easy repositioning of the front crossbeam 1. The height of the adapter bracket 4 can be adjusted as needed to better ensure the horizontal alignment of the front and rear ends of the battery pack.

[0041] As shown in Figure 4, the adapter bracket 4 in this application includes a bracket box 41. The bracket box 41 is hollow inside. The bracket box 41 can increase the height of the adapter bracket 4 while ensuring its strength. At the same time, the hollow bracket box 41 can reduce weight and facilitate the subsequent connection of fasteners. In other words, the hollow bracket box 41 can reduce the resistance of fasteners passing through, that is, it is easier for fasteners to connect with other components after passing through the bracket box 41, such as facilitating the connection of fasteners to the rear longitudinal beam body 104 after passing through the bracket box 41.

[0042] In this application, the bracket box 41 is connected to the rear longitudinal beam body 104 via the support flange 42. This configuration ensures the contact area between the adapter bracket 4 and the rear longitudinal beam body 104, thereby facilitating the fitting and installation of the bracket box 41 on the rear longitudinal beam body 104.

[0043] Furthermore, in this application, the support frame 3 is inclined, which causes the rear longitudinal beam body 104, the rear floor crossbeam 102, and the rear fixing structure 101 to form a triangular structure. This better ensures the stability and firmness of the connection between the rear fixing structure 101 and the vehicle body.

[0044] Furthermore, in this application, the front crossbeam 1, the support frame 3, and the anchor bracket 2 are all made of aluminum alloy. This design greatly ensures the structural strength of the front crossbeam 1, the support frame 3, and the anchor bracket 2.

[0045] In this application, the vertical sections, i.e., cross sections, of the front crossbeam 1 and the anchor beam 21 are both rectangular. This application adopts a rectangular aluminum alloy structure, which better ensures the structural strength of the front crossbeam 1 and the anchor beam 21, and at the same time, facilitates the subsequent connection with the rear floor crossbeam 102 or the rear longitudinal beam body 104.

[0046] A rear floor assembly includes a rear floor body, which comprises two spaced-apart and oppositely distributed rear longitudinal beam bodies 104. A rear floor crossbeam 102 is provided between the two rear longitudinal beam bodies. A rear fixing structure 101 is provided on the rear floor body. Both ends of the rear fixing structure 101 are connected to the rear longitudinal beam bodies via an adapter bracket 4. The rear fixing structure 101 is connected to the rear floor crossbeam 102 via an anchor beam 21. The rear fixing structure 101 disclosed in this application facilitates the connection between the battery pack and the vehicle body. In addition, the use of the front crossbeam 1, the support frame 3, and the anchor bracket 2 greatly ensures the structural strength of the rear fixing structure 101. Furthermore, the rear fixing structure 101 at the rear of the vehicle can maximize the torsional mode and torsional stiffness of the vehicle while meeting the requirements of layout process and cost, thereby improving the vehicle's NVH (Noise, Vibration and Harshness) performance and operational stability.

[0047] Furthermore, as shown in Figures 2 and 3, in this application, both ends of the rear floor beam 102 are connected to the rear longitudinal beam body 104 via a beam connecting plate 103 (as shown in Figure 6). The beam connecting plate 103 facilitates the installation and connection of the rear floor beam 102 to the rear longitudinal beam body 104.

[0048] specific:

[0049] The rear fixing structure 101 disclosed in this application mainly includes a front crossbeam 1, a support frame 3, and an anchor bracket 2. The front crossbeam 1 is connected to the anchor bracket 2 via the support frame 3. The rear fixing structure 101 is connected to the battery pack via the front crossbeam 1. The anchor bracket 2 includes two spaced-apart anchor beams 21, and the rear fixing structure 101 is attached to the rear floor crossbeam 102 of the vehicle body via the anchor bracket 2.

[0050] This application can maximize the torsional mode and torsional stiffness of the vehicle while meeting the requirements of layout process and cost, thereby improving the vehicle's NVH performance and handling stability.

[0051] The rear fixing structure 101 disclosed in this application is mainly an aluminum alloy frame structure. The rear fixing structure 101 is connected to the vehicle body via an adapter bracket 4.

[0052] Furthermore, in this application, the main structure of the rear fixed structure 101 is made of an aluminum frame, that is, welded extruded aluminum square tubes. The front crossbeam 1 provides the battery pack mounting point and the front anchor point. The middle is a W-shaped aluminum support frame 3 as the main force transmission frame, and the lower anchor point bracket 2 is connected to the vehicle body as the rear anchor point.

[0053] The rear fixing structure 101 disclosed in this application, together with the vehicle body, can form a stable structure comprising multiple mutually supporting triangles, which can effectively improve the torsional performance of the vehicle body.

[0054] In this application, the adapter bracket 4 is made of sheet metal self-welding and is double-sidedly overlapped with the rear longitudinal beam body 104.

[0055] Anchor beam 21 is also made of aluminum tube, which is welded to the support frame 3 and bolted to the rear floor beam 102.

[0056] Based on the above design, the adapter bracket 4 can be flexibly changed according to the position and needs, which not only meets the platform requirements but also ensures the flexibility of layout for different vehicle models. In other words, it can be used for different vehicle models, and only the position of the battery pack hanger and its connection with the frame need to be adjusted accordingly.

[0057] In addition, in this application, the front crossbeam 1, the support frame 3 and the anchor bracket 2 are mainly made of aluminum profiles and are connected by welding to form an aluminum frame as the core frame.

[0058] The aluminum frame is then connected to the vehicle body with bolts.

[0059] Specifically, the two ends of the front crossbeam 1 are connected to the rear longitudinal beam body 104 through a transition bracket 4, and the anchor bracket 2 is connected to the rear floor crossbeam 102.

[0060] That is, each rear longitudinal beam body 104 in this application is provided with a transition bracket 4. The two transition brackets 4 are symmetrically distributed from left to right. When connecting, the transition brackets 4 are spot welded to the rear longitudinal beam body 104, and the supporting flanges 42 of the transition brackets 4 are required to overlap at the chamfer or boss feature of the rear longitudinal beam to ensure local connection rigidity.

[0061] The rear floor beam 102 is spot-welded to the rear longitudinal beam body 104 and the rear floor beam 102 respectively through welding surfaces. The welding surfaces ensure three-sided overlap, thereby ensuring stable and continuous force transmission at the joint. The connecting plates 103 on the left and right sides of the rear floor beam 102 are symmetrically distributed.

[0062] In summary, this application has the following advantages:

[0063] The design layout of this application is reasonable. In the oil-to-electric conversion project, the process is reasonable and easy to manufacture. The main frame beams are connected by bolts, the basic platform body requires little modification, and it is easy to install and disassemble. It is also lightweight and minimizes manufacturing costs and achieves overall vehicle weight reduction while achieving performance targets.

[0064] The structural design of this application is reliable. It adopts a frame beam structure to form a stable structure including five triangles, which can meet the performance improvement of NVH, torsional stiffness improvement of about 30%, torsional mode improvement of about 8%, and meet the requirements of different performance such as strength fatigue, safety, layout, and process. The process is simple, the production difficulty is low, the weight and cost are reduced, and the product competitiveness is improved.

[0065] The design of this application is ingenious and aesthetically pleasing, making the overall structure of the rear floor of the vehicle stable, with excellent performance and low cost.

[0066] The rear fixing structure 101 disclosed in this application and the vehicle body structure form a structure with five triangles.

[0067] The front crossbeam 1 is made of aluminum profile, providing direct fixing points for the battery pack. This allows the rear fixing structure 101 disclosed in this application to provide three mounting points for the battery pack at the rear of the vehicle, which means adding three battery pack mounting points to the front crossbeam 1. Two mounting points are set on the left and right sides of the vehicle body, respectively. The mounting points on both sides are connected to the rear longitudinal beam body 104 through sheet metal parts, i.e., adapter brackets 4. The third mounting point is located in the middle of the front crossbeam 1 as much as possible, so that the three mounting points are evenly distributed, more balanced from left to right, and stable in force transmission. If there are two mounting points in the middle of the front crossbeam 1, the mounting points should be located at the three equal division points of the front crossbeam 1 as much as possible.

[0068] The support frame 3 disclosed in this application is a W-shaped aluminum frame that serves as the main intermediate force transmission path between the rear floor beam 102 and the rear battery pack mounting point.

[0069] The rear structure is anchor bracket 2, which is an aluminum profile bracket.

[0070] The various aluminum profiles in this application are connected by welding to make the rear fixing structure 101 as symmetrical as possible.

[0071] In this application, the fixing points of the battery packs at both ends of the front crossbeam 1 coincide with the connection points of the front crossbeam 1 and the adapter bracket 4. Based on this design, a secondary connection between the front crossbeam 1 and the adapter bracket 4 can be realized, which better ensures the stability of the front crossbeam 1 installed on the adapter bracket 4.

[0072] In addition, in this application, the connection points between the battery pack and the front crossbeam 1 are arranged at even intervals on the front crossbeam 1 as much as possible, and the welding position of the W-shaped support frame 3 and the front crossbeam 1 is exactly located at the fixed connection position between the battery pack and the front crossbeam 1.

[0073] The anchor beam 21 is connected to the rear floor crossbeam 102 by bolts. The mounting holes for the connection should be made to be similar to those for the fuel tank. The mounting points of the anchor beam 21 and the rear floor crossbeam 102 should be made as rigid as possible, for example, on a closed-section bracket or beam. This is mainly to solve the problem of the strength of the battery pack mounting point and the structural weakness of the battery pack to the rear floor crossbeam 102 when the vehicle body is twisted.

[0074] The rear longitudinal beam body 104 of this application mainly solves the left and right force transmission support structure of the rear fixed structure 101. The front crossbeam 1 is connected to the rear longitudinal beam body 104 at both ends, and the anchor bracket 2 is connected to the rear floor crossbeam 102, thereby forming a continuous and stable structure in all directions, ensuring that the force transmission of the rear fixed structure 101 is continuous and stable.

[0075] Furthermore, in this application, the adapter bracket 4 is connected to the rear longitudinal beam body 104. The adapter bracket 4 and the rear longitudinal beam body 104 are spot welded together by the support flange 42. The support flange 42 is as close as possible to the chamfer of the rear longitudinal beam to ensure that the rigidity and strength of the welded area meet the requirements.

[0076] In addition, the adapter bracket 4 disclosed in this application is hollow inside and is attached to the rear longitudinal beam body 104 by the support flange 42, forming a closed section, which solves the problem of insufficient rigidity and strength of the left and right mounting points at the rear of the battery pack.

[0077] The rear floor crossbeam 102 of this application mainly provides the installation points for the anchor beam 21, and the installation points are also distributed as evenly as possible in space. This mainly solves the force transmission path of the vehicle body to the left and right, and front and rear.

[0078] In this application, the connecting plate 103 on the right side of the rear floor beam 102 is welded to the rear longitudinal beam body 104 and the rear floor beam 102 via welding surfaces. The connecting plate 103 on the left side is symmetrical and identical to that on the right side, reducing the number of molds required.

[0079] The rear fixing structure 101 for battery pack disclosed in this application has an aesthetically pleasing overall structure and continuous force transmission. In addition to meeting the performance requirements of vehicle structure durability, NVH and safety, it also takes into account weight and cost due to the light weight of aluminum profiles.

[0080] Obviously, the specific implementation of this application is not limited to the above-mentioned methods. Any non-substantial improvements made using the inventive concept and technical solution of this application are within the scope of protection of this application.

Claims

1. A rear fixing structure for a battery pack, wherein, It includes a front crossbeam (1), a support frame (3), and an anchor bracket (2); The front crossbeam (1) is connected to the anchor bracket (2) through the support frame (3); The battery pack is connected to the battery pack via the front crossbeam (1) using a rear fixing structure.

2. The rear fixing structure for a battery pack according to claim 1, wherein, The supporting frame (3) includes a frame body, which includes a first connecting frame (31), a second connecting frame (32), a third connecting frame (33), and a fourth connecting frame (34); the first connecting frame (31), the second connecting frame (32), the third connecting frame (33), and the fourth connecting frame (34) are connected in sequence; the first connecting frame (31) and the second connecting frame (32) are intersecting; the second connecting frame (32) and the third connecting frame (33) are intersecting; the third connecting frame (33) and the fourth connecting frame (34) are intersecting; the supporting frame (3) is W-shaped.

3. The rear fixing structure for a battery pack according to claim 2, wherein, The frame body is provided with a fitting plane for fitting with the front crossbeam (1) or the anchor bracket (2); the frame body is connected to the front crossbeam (1) or the anchor bracket (2) through the fitting plane.

4. The rear fixing structure for a battery pack according to claim 2, wherein, The anchor bracket (2) includes two spaced anchor beams (21), and the battery pack is attached to the rear floor crossbeam (102) of the vehicle body by the rear fixing structure through the anchor bracket (2); an anchor beam (21) is connected to the connection between the first connecting frame (31) and the second connecting frame (32) and the connection between the third connecting frame (33) and the fourth connecting frame (34).

5. The rear fixing structure for a battery pack according to claim 1, wherein, The front crossbeam (1) is used to connect with the rear longitudinal beam body (104), and both ends of the front crossbeam (1) are connected to the rear longitudinal beam body (104) through a transition bracket (4).

6. The rear fixing structure for a battery pack according to claim 5, wherein, The adapter bracket (4) includes a bracket box (41), which is connected to the rear longitudinal beam body (104) via a support flange (42).

7. A rear fixing structure for a battery pack according to claim 5, wherein, The support frame (3) is inclined, and the front crossbeam (1), the support frame (3) and the anchor bracket (2) are all made of aluminum alloy.

8. A rear fixing structure for a battery pack according to claim 5, wherein, The cross-sections of the front crossbeam (1) and the anchor bracket are both rectangular.

9. A rear floor assembly, wherein, The system includes a rear floor body, which comprises two spaced and oppositely distributed rear longitudinal beam bodies (104); a rear floor crossbeam (102) is provided between the two rear longitudinal beam bodies (104); the rear floor body is provided with a rear fixing structure for the battery pack as described in any one of claims 1-8; both ends of the rear fixing structure for the battery pack are respectively connected to the rear longitudinal beam bodies (104) via an adapter bracket (4); the rear fixing structure for the battery pack is connected to the rear floor crossbeam (102) via the anchor bracket (2).

10. A rear floor assembly according to claim 9, wherein, The two ends of the rear floor beam (102) are connected to the rear longitudinal beam body (104) through a connecting plate (103).