A rear mounting structure for a battery pack and a rear floor assembly having the rear mounting structure.

Abstract

This invention relates to the field of battery packs, specifically to a rear fixing structure for a battery pack and a rear floor assembly having the rear fixing structure, including a front crossbeam, a support frame, and an anchor bracket; the front crossbeam is connected to the anchor bracket via the support frame; the rear fixing structure is connected to the battery pack via the front crossbeam; the rear fixing structure disclosed in this invention facilitates the connection between the battery pack and the vehicle body. Furthermore, the combined use of the front crossbeam, support frame, and anchor bracket greatly ensures the structural strength of the rear fixing structure; and the rear fixing structure, while meeting the requirements of layout process and cost, can maximize the torsional mode and torsional stiffness of the vehicle, thereby improving the NVH performance and handling stability of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of battery packs, and more specifically to a rear fixing structure for a battery pack and a rear floor assembly having the rear fixing structure. Background Technology

[0002] With the popularity of electric vehicles, more and more new energy vehicles are being developed and produced by OEMs, and even vehicles based on traditional gasoline platforms are gradually being converted to electric vehicles.

[0003] The addition of power batteries at the bottom of the car, and the varying sizes of these batteries, presents new design challenges for the vehicle's performance.

[0004] In particular, it has a significant impact on the torsional mode and torsional stiffness of the body-in-white. Although the torsional stiffness will be improved on the one hand, the torsional mode of the whole vehicle will often be significantly reduced due to the increase in the weight of the battery pack, which puts forward new requirements for performance indicators. This in turn puts forward new design requirements for the location and form of battery pack installation.

[0005] Existing designs are basically fixed by a single small bracket. Generally, two additional small brackets are connected to the lifting lugs on the vehicle body, such as the content disclosed in patent CN115195440A - a battery pack rear mounting point fixing structure.

[0006] In addition, the addition of a large battery pack to the vehicle body in the oil-to-electric conversion project, and the battery pack itself provides additional rigidity to the vehicle body, results in the problem that the rear of the battery pack, especially the rear of the door sill, is relatively weaker than the front. The overall rigidity is discontinuous, so the torsional mode will decrease significantly after the addition of the battery pack due to the change in mass distribution.

[0007] Therefore, in order to improve or solve at least one of the above problems, it is necessary to optimize the design of the existing battery pack installation structure. Summary of the Invention

[0008] The purpose of this invention is to provide a rear-mounted battery pack structure that facilitates rear-mounted battery pack connection and improves the torsional mode and torsional stiffness of the entire vehicle.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A rear fixing structure for a battery pack includes a front crossbeam, a support frame, and an anchor bracket.

[0011] The front crossbeam is connected to the anchor bracket via a support frame;

[0012] The rear-mounted structure of the vehicle body is connected to the battery pack via the front crossbeam.

[0013] The supporting 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 supporting frame is W-shaped.

[0014] The frame body is provided with a fitting plane for fitting with the front crossbeam or anchor bracket; the frame body is connected to the front crossbeam or anchor bracket through the fitting plane.

[0015] The anchor bracket includes two spaced-apart anchor beams, and the rear vehicle body fixing structure is connected to the rear floor crossbeam of the vehicle body through the anchor bracket; an anchor beam is connected at the connection between the first and second connecting frames and at the connection between the third and fourth connecting frames.

[0016] The two ends of the front crossbeam are connected to the rear longitudinal beam body through a transition bracket.

[0017] The adapter bracket includes a bracket box, which is connected to the rear longitudinal beam body via a support flange.

[0018] The support frame is inclined, and the front crossbeam, support frame, and anchor bracket are all made of aluminum alloy.

[0019] The vertical cross-sections of the front crossbeam and the anchor beam are rectangular.

[0020] A rear floor assembly includes a rear floor body, the rear floor body including two rear longitudinal beam bodies spaced apart and opposite to each other; a rear floor crossbeam is provided between the two rear longitudinal beam bodies; a rear fixing structure is provided on the rear floor body; both ends of the rear fixing structure are respectively connected to the rear longitudinal beam bodies through a transition bracket; the rear fixing structure is connected to the rear floor crossbeam through an anchor beam.

[0021] Both ends of the rear floor beam are connected to the rear longitudinal beam body via a beam connecting plate.

[0022] The advantages of this invention are:

[0023] This invention discloses a rear fixing structure for a battery pack and a rear floor assembly having the rear fixing structure.

[0024] The rear fixing structure disclosed in this invention facilitates the connection between the battery pack and the vehicle body. In addition, the use of the front crossbeam, support frame and anchor bracket in combination greatly ensures the structural strength of the rear fixing structure.

[0025] Furthermore, the rear of the vehicle, through the setting of a rear-mounted structure, can maximize the torsional mode and torsional stiffness of the vehicle, thereby improving the NVH performance and operational stability of the vehicle, while meeting the requirements of layout process and cost. Attached Figure Description

[0026] The following is a brief explanation of the contents of each of the accompanying drawings and the markings in the drawings:

[0027] Figure 1 This is a schematic diagram of the rear fixing structure in this invention.

[0028] Figure 2 This is a schematic diagram of the structure of the present invention when it is connected to the vehicle body.

[0029] Figure 3 This is an exploded view of the rear floor assembly in this invention.

[0030] Figure 4 This is a schematic diagram of the adapter bracket in this invention.

[0031] Figure 5 This is a schematic diagram of the structure of the rear longitudinal beam body in this invention.

[0032] Figure 6 This is a schematic diagram of the connecting plate in this invention.

[0033] The markings in the above figures are all:

[0034] 1. Front crossbeam, 2. Anchor bracket, 3. Support frame, 101 Rear fixing structure, 102 Rear floor crossbeam, 103 Connecting plate, 104 Rear longitudinal beam body. Detailed Implementation

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and the description of the preferred embodiments.

[0036] A rear fixing structure 101 for a battery pack includes a front crossbeam 1, a support frame 3, and an anchor bracket 2. The rear fixing structure 101 disclosed in this invention 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 in combination greatly ensures the structural strength of the rear fixing structure 101.

[0037] The rear fixing structure 101 disclosed in this invention is mainly used for connecting and installing the battery pack at the rear of the vehicle body.

[0038] The rear fixing structure 101 for the battery pack disclosed in this invention mainly includes a front crossbeam 1, a support frame 3, and an anchor bracket 2. The two ends of the front crossbeam 1 are laterally connected to the two rear longitudinal beam bodies, while the support frame 3 acts as a bridging frame, which facilitates the connection between the anchor bracket 2 and the front crossbeam 1. In addition, in this invention, the anchor bracket 2 is connected to the rear floor crossbeam 102. Based on this design, the rear longitudinal beam body, the rear floor crossbeam 102, and the rear fixing structure 101 form a triangular design, which can not only ensure the rear structural strength of the rear floor assembly, but also ensure the structural strength of the rear of the vehicle chassis.

[0039] In this invention, the front crossbeam 1 is connected to the anchor bracket 2 via the support frame 3; the rear vehicle body 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.

[0040] Furthermore, in this invention, the supporting frame 3 includes a frame body, which is the main structure of the supporting frame 3. 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 supporting frame 3 is W-shaped. Based on the above design, the supporting 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 supporting frame 3 and the rear fixing structure 101.

[0041] Furthermore, in this invention, the frame body is provided with a contact 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 contact plane; the setting of the contact 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.

[0042] Furthermore, the anchor bracket 2 described in this invention 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.

[0043] Meanwhile, in this invention, the rear vehicle body fixing structure 101 is connected to the rear floor crossbeam 102 of the vehicle body via anchor point brackets 2; an anchor point 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 respectively; the anchor point beam 21 acts as a connector and is located at the connection of each connecting frame. Based on the above design, the anchor point beam 21 can also act as a reinforcing member; thus better ensuring the structural strength of the rear fixing structure 101.

[0044] Furthermore, in this invention, the two ends of the front crossbeam 1 are respectively connected to the rear longitudinal beam body 104 through a transition bracket 4; the connection of the transition bracket 4 facilitates the connection between the front crossbeam 1 and the rear longitudinal beam body 104, and the transition bracket 4 can also act as a suspension beam, making it easy to change the position of the front crossbeam 1; the height of the transition bracket 4 can be modified as needed to better ensure the horizontality of the front and rear ends of the battery pack.

[0045] In this invention, the adapter bracket 4 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 fastener insertion.

[0046] In this invention, the bracket box 41 is connected to the rear longitudinal beam body 104 via the supporting flange 42. Based on this arrangement, the contact area between the adapter bracket 4 and the rear longitudinal beam body 104 is guaranteed, thereby facilitating the fitting and installation of the bracket box 41 on the rear longitudinal beam body 104.

[0047] Furthermore, in this invention, the support frame 3 is inclined, which makes the rear longitudinal beam body 104, the rear floor crossbeam 102 and the rear fixing structure 101 form a triangular structure; thereby better ensuring the stability and firmness of the connection between the rear fixing structure 101 and the vehicle body.

[0048] Meanwhile, in this invention, the front crossbeam 1, the support frame 3, and the anchor bracket 2 are all made of aluminum alloy; this arrangement greatly ensures the structural strength of the front crossbeam 1, the support frame 3, and the anchor bracket 2.

[0049] In this invention, the front crossbeam 1 and the anchor beam 21 have rectangular vertical cross sections. The present invention adopts a rectangular aluminum alloy structure, which better ensures the structural strength of the front crossbeam 1 and the anchor beam 21. At the same time, it also facilitates the subsequent connection with the rear floor crossbeam 102 or the rear longitudinal beam body 104.

[0050] A rear floor assembly includes a rear floor body, which includes two rear longitudinal beam bodies 104 spaced apart and opposite to each other; 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 respectively connected to the rear longitudinal beam bodies through an adapter bracket 4; the rear fixing structure 101 is connected to the rear floor crossbeam 102 through an anchor beam 21. The rear fixing structure 101 disclosed in this invention facilitates the connection between the battery pack and the vehicle body. In addition, the present invention, through the cooperative 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; and through the setting of the rear fixing structure 101, the torsional mode and torsional stiffness of the vehicle can be maximized while meeting the requirements of layout process and cost, thereby improving the NVH performance and handling stability of the vehicle.

[0051] Furthermore, in this invention, both ends of the rear floor beam 102 are connected to the rear longitudinal beam body 104 via a beam connecting plate 103; the beam connecting plate 103 facilitates the installation and connection of the rear floor beam 102 on the rear longitudinal beam body 104.

[0052] specific:

[0053] The rear fixing structure 101 disclosed in this invention 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 through the support frame 3; the rear fixing structure 101 is connected to the battery pack through the front crossbeam 1; the anchor bracket 2 includes two spaced anchor beams 21, and the rear fixing structure 101 is attached to the rear floor crossbeam 102 of the vehicle body through the anchor bracket 2.

[0054] This invention 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 operational stability.

[0055] The rear fixing structure 101 disclosed in this invention is mainly an aluminum alloy frame structure; the rear fixing structure 101 of this invention is connected to the vehicle body through the adapter bracket 4.

[0056] Furthermore, in this invention, the main structure of the rear fixing 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 rivet bracket is connected to the vehicle body as the rear anchor point.

[0057] The rear fixing structure 101 disclosed in this invention, together with the vehicle body, forms a stable structure in which multiple triangles support each other, which can effectively improve the torsional performance of the vehicle body.

[0058] In this invention, the adapter bracket 4 is made of sheet metal self-welding and is double-sidedly overlapped with the rear longitudinal beam body 104.

[0059] 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.

[0060] Furthermore, the rear fixing structure of the present invention also includes a gasket mechanism, which includes multiple individual gaskets. The individual gaskets can be arranged between the anchor beam and the rear floor crossbeam, or between the front crossbeam and the adapter bracket. The arrangement of the individual gaskets can change the ground clearance of the front crossbeam or the anchor beam as needed, thereby controlling the flatness of the front and rear ends of the battery pack. At the same time, it can also change the inclination of the rear fixing structure as needed.

[0061] In addition, in this invention, the front crossbeam and the adapter bracket can be connected by welding or by other connection methods.

[0062] Based on the above design, the adapter bracket 4 can be flexibly changed according to position and requirements, which not only satisfies the platformization but also ensures the flexibility of layout for different vehicle models. It can be used for different vehicle models, and only the position of the battery pack hanger and the connection with the frame need to be adjusted accordingly.

[0063] In addition, in this invention, the front crossbeam 1, the support frame 3 and the anchor bracket 2 are mainly made of aluminum profiles connected by welding to form an aluminum frame as the core frame.

[0064] The aluminum frame is then connected to the vehicle body with bolts.

[0065] Specifically, the two ends of the front crossbeam 1 are connected by a transition bracket 4 or the rear longitudinal beam body 104, and the anchor bracket 2 is connected to the rear floor crossbeam 102.

[0066] Meanwhile, in this invention, each rear longitudinal beam body 104 is provided with a transition bracket 4; and the two transition brackets 4 are symmetrically distributed from left to right. When connecting, the transition bracket 4 is connected to the rear longitudinal beam body 104 by spot welding, and the supporting flange 42 of the transition bracket 4 is required to overlap at the chamfer or boss feature of the rear longitudinal beam to ensure local connection rigidity.

[0067] 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 to ensure stable and continuous force transmission at the joint, and the left and right connecting plates 103 of the rear floor beam 102 are symmetrical.

[0068] In summary, the present invention has the following advantages:

[0069] The design layout of this invention 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 less modification, and it is easy to install and disassemble. It is also lightweight and minimizes manufacturing costs and overall vehicle weight reduction while achieving performance goals.

[0070] The present invention features a reliable structural design, employing a frame beam structure to form a stable structure of five triangles. This structure can improve NVH performance, increase torsional stiffness by approximately 30%, and improve torsional mode by approximately 8%. It also meets the requirements of different performance aspects such as strength fatigue, safety, layout, and manufacturing processes. This reduces production and simplifies processes, lowers weight and costs, and enhances product competitiveness.

[0071] The invention is ingenious and aesthetically pleasing, and its use makes the overall structure of the rear floor of the vehicle stable, with excellent performance and low cost.

[0072] The rear fixing structure 101 disclosed in this invention and the vehicle body structure form a structure with 5 triangles.

[0073] The front crossbeam 1 is made of aluminum profile, providing direct fixing points for the battery pack. This allows the rear fixing structure 101 of the work card to provide three mounting points for the battery pack at the rear of the vehicle. In other words, it adds three battery pack mounting points to the front crossbeam 1. Two of the fixing points are located on the left and right sides of the vehicle body, respectively. The fixing points on both sides are connected to the rear longitudinal beam body 104 via sheet metal adapter brackets 4. The third one is placed in the middle 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, the mounting points should be placed at the three equal division points of the front crossbeam 1 as much as possible.

[0074] The support frame 3 disclosed in this invention 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.

[0075] The rear structure is anchor bracket 2, which is an aluminum profile bracket.

[0076] In this invention, the various aluminum profiles are connected by welding to make the rear fixing structure 101 as symmetrical as possible.

[0077] In this invention, the fixing points of the battery packs at both ends of the front crossbeam 1 coincide with the connection points between 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 achieved, which better ensures the stability of the front crossbeam 1 installed and connected on the adapter bracket 4.

[0078] In addition, in this invention, 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.

[0079] The anchor beam 21 is connected to the rear floor crossbeam 102 by bolts. The mounting holes for connection should be compatible with, for example, the mounting holes 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 torn.

[0080] The rear longitudinal beam body 104 of the present invention 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 the front, back and left and right, ensuring that the force transmission of the rear fixed structure 101 is continuous and stable.

[0081] Furthermore, in this invention, 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 connected by spot welding through 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 welding area meet the requirements.

[0082] In addition, the adapter bracket 4 disclosed in this invention 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.

[0083] The rear floor crossbeam 102 of this invention mainly provides the installation points for the anchor beam 21, and the positions of the installation points are also distributed as evenly as possible in space; it mainly solves the force transmission paths of the vehicle body to the left and right, and front and rear.

[0084] The right connecting plate 103 of the rear floor beam 102 described in this invention is welded to the rear longitudinal beam body 104 and the rear floor beam 102 respectively through welding surfaces; the left connecting plate 103 is symmetrical and the same as the right side, reducing the number of molds.

[0085] The rear fixing structure 101 for battery pack disclosed in this invention 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.

[0086] Obviously, the specific implementation of this invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of this invention are within the protection scope of this invention.

Claims

1. A rear fixing structure for a battery pack, characterized in that, This includes the front crossbeam, support frame, and anchor brackets; The front crossbeam is connected to the anchor bracket via a support frame; The battery pack is connected to the battery pack via a front crossbeam using a rear fixing structure; The supporting 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 supporting frame is W-shaped. The anchor bracket includes two spaced-apart anchor beams. 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. The two ends of the front crossbeam are respectively connected to the rear longitudinal beam body through a transition bracket; The adapter bracket includes a bracket box, which is connected to the rear longitudinal beam body via a support flange.

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

3. The rear fixing structure for a battery pack according to claim 1, characterized in that, The support frame is inclined, and the front crossbeam, support frame, and anchor bracket are all made of aluminum alloy.

4. The rear fixing structure for a battery pack according to claim 1, characterized in that, The vertical cross-sections of the front crossbeam and the anchor beam are rectangular.

5. A rear floor assembly, characterized in that, The system includes a rear floor body, which comprises two rear longitudinal beam bodies spaced apart and opposite to each other; a rear floor crossbeam is provided between the two rear longitudinal beam bodies; the rear floor body is provided with a rear fixing structure as described in any one of claims 1-4; both ends of the rear fixing structure are respectively connected to the rear longitudinal beam bodies through a transition bracket; the rear fixing structure is connected to the rear floor crossbeam through an anchor beam.

6. A rear floor assembly according to claim 5, characterized in that, Both ends of the rear floor beam are connected to the rear longitudinal beam body via a beam connecting plate.

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