Rear fixing structure for battery pack and rear floor assembly with rear fixing structure

Abstract

The invention relates to the field of battery packs, in particular to a rear fixing structure for a battery pack and a rear floor assembly with the rear fixing structure, and the rear fixing structure comprises a front cross beam, a supporting frame and an anchor point support; the front cross beam is connected with the anchor point support through the supporting frame. The vehicle body rear fixing structure is connected to the battery pack through the front cross beam; according to the rear fixing structure, connection between the battery pack and the vehicle body is facilitated, and in addition, through cooperative use of the front cross beam, the supporting frame and the anchor point support, the structural strength of the rear fixing structure is greatly guaranteed; the rear part of the whole vehicle is arranged through a rear part fixing structure; on the premise that the arrangement process and the cost are met, the torsional mode and the torsional rigidity of the whole vehicle can be improved to the maximum extent, and the NVH performance and the operation stability performance of the whole vehicle are improved.

Description

Technical Field

[0001] The present invention relates to the field of battery packs, and in particular to a rear fixing structure for a battery pack and a rear floor assembly having the rear fixing structure. Background Art

[0002] With the popularity of electric vehicles, more and more new energy vehicles are being developed and produced by OEMs, and even cars based on traditional oil vehicle platforms are gradually joining the so-called oil-to-electric conversion route.

[0003] The addition of power batteries at the bottom of the car and the different sizes of the power batteries pose new design challenges to the car body performance.

[0004] In particular, it has a greater impact on the performance of 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 entire vehicle will often be greatly reduced due to the increase in the weight of the battery pack, which puts forward new requirements for performance indicators. This also puts forward new design requirements for the location and form of the battery pack installation.

[0005] The existing design is basically a fixed form of a single small bracket, generally in the form of two additional small brackets on the vehicle body connected to the lifting ears, such as the content disclosed in patent CN115195440A - a battery pack rear mounting point fixing structure.

[0006] In addition, in the oil-to-electric project, a large-mass battery pack is added to the vehicle body and the battery pack itself provides additional rigidity for the vehicle body. This leads to the problem that the rigidity of the rear part of the battery pack, especially the rear part of the vehicle door sill, is relatively weak relative to the front end, and the overall rigidity is discontinuous. Therefore, the torsional mode will drop significantly after the battery pack is added 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 object of the present invention is to provide a rear fixing structure for a battery pack which facilitates the rear connection of the battery pack and can improve the torsional mode and torsional stiffness of the entire vehicle.

[0009] In order to achieve the above object, the technical solution adopted by the present invention is:

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

[0011] The front cross beam is connected to the anchor bracket through a support frame;

[0012] The rear fixed structure of the vehicle body is connected to the battery pack via a front cross beam.

[0013] The support frame includes a frame body, and the frame body includes a first frame, a second frame, a third frame and a fourth frame; the first frame, the second frame, the third frame and the fourth frame are connected in sequence; the first frame and the second frame are intersecting; the second frame and the third frame are intersecting; the third frame and the fourth frame are intersecting; the support frame is W-shaped.

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

[0015] The anchor bracket includes two anchor beams distributed at intervals, and the rear fixed structure of the vehicle body is overlapped on the rear floor cross beam of the vehicle body through the anchor bracket; an anchor beam is respectively connected to the connection between the first connecting frame and the second connecting frame and the connection between the third connecting frame and the fourth connecting frame.

[0016] The two ends of the front cross beam are respectively connected to the rear longitudinal beam body through an adapter bracket.

[0017] The adapter bracket includes a bracket box, and the bracket box is connected to the rear longitudinal beam body through a supporting flange.

[0018] The support frame is tilted, and the front cross beam, the support frame and the anchor bracket are all made of aluminum alloy material.

[0019] The front cross beam and the anchor beam have rectangular vertical cross sections.

[0020] A rear floor assembly includes a rear floor body, wherein the rear floor body includes two rear longitudinal beam bodies that are spaced apart and relatively distributed; a rear floor cross beam is provided between the two rear longitudinal beam bodies; the rear floor body is provided with the rear fixing structure; both ends of the rear fixing structure are respectively connected to the rear longitudinal beam body through an adapter bracket; the rear fixing structure is connected to the rear floor cross beam through an anchor beam.

[0021] The two ends of the rear floor cross beam are respectively connected to the rear longitudinal beam body through a cross beam connecting plate.

[0022] The advantages of the present invention are:

[0023] The 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 the present invention facilitates the connection between the battery pack and the vehicle body. In addition, the present invention greatly ensures the structural strength of the rear fixing structure through the coordinated use of the front cross beam, the support frame and the anchor bracket.

[0025] In addition, the rear part of the vehicle is provided with a rear fixed structure; it can maximize the torsional mode and torsional stiffness of the vehicle while meeting the layout process and cost, and improve the NVH performance and operational stability performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following is a brief description of the contents expressed in the drawings of the present invention and the symbols in the drawings:

[0027] Figure 1 It is a schematic structural diagram of the rear fixing structure of the present invention.

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

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

[0030] Figure 4 It is a schematic diagram of the structure of the adapter bracket in the present invention.

[0031] Figure 5 It is a structural schematic diagram of the rear longitudinal beam body in the present invention.

[0032] Figure 6 It is a structural schematic diagram of the connecting plate in the present invention.

[0033] The marks in the above figure are:

[0034] 1. front cross beam, 2. anchor bracket, 3. support frame, 101 rear fixed structure, 102. rear floor cross beam, 103. connecting plate, 104. rear longitudinal beam body. DETAILED DESCRIPTION

[0035] The specific implementation of the present invention will be further explained in detail below by describing the optimal embodiment with reference to the accompanying drawings.

[0036] A rear fixing structure 101 for a battery pack includes a front cross beam 1, a support frame 3 and an anchor bracket 2. The rear fixing structure 101 disclosed in the present invention facilitates the connection between the battery pack and the vehicle body. In addition, the present invention greatly ensures the structural strength of the rear fixing structure 101 through the coordinated use of the front cross beam 1, the support frame 3 and the anchor bracket 2.

[0037] The rear fixing structure 101 disclosed in the present 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 the present invention mainly includes a front cross beam 1, a support frame 3 and an anchor bracket 2; the two ends of the front cross beam 1 are horizontally overlapped on the two rear longitudinal beam bodies, and the support frame 3 acts as a bridging frame to facilitate the connection between the anchor bracket 2 and the front cross beam 1. In addition, in the present invention, the anchor bracket 2 is connected to the rear floor cross beam 102; based on this design, the rear longitudinal beam body, the rear floor cross beam 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 the present invention, the front cross beam 1 is connected to the anchor bracket 2 through the support frame 3; the rear vehicle body fixing structure 101 is connected to the battery pack through the front cross beam 1; based on the above design, the installation and fixation of the battery pack on the vehicle body is facilitated.

[0040] Furthermore, in the present invention, the support frame 3 includes a frame body, which is the main structure of the support frame 3, and in the present invention, 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 in sequence; the first connecting frame 31 and the second connecting frame 32 are arranged to intersect; the second connecting frame 32 and the third connecting frame 33 are arranged to intersect; the third connecting frame 33 and the fourth connecting frame 34 are arranged to intersect; 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 are used in combination to form a plurality of triangular structures, which better ensure the structural strength of the support frame 3 and the rear fixed structure 101.

[0041] Furthermore, in the present invention, 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 via the fitting plane; the setting of the fitting plane ensures the contact area between the support frame 3 and the front crossbeam 1 or the anchor bracket 2, thereby ensuring the installation stability between the frame body and the front crossbeam 1 and the anchor bracket 2.

[0042] Furthermore, in the present invention, the anchor bracket 2 includes two anchor beams 21 that are spaced apart from each other. The anchor beam 21 acts as a connecting member, which facilitates the overlapping installation of the anchor beam 21 on the rear floor cross beam 102 .

[0043] At the same time, in the present invention, the rear vehicle body fixed structure 101 is overlapped on the rear floor cross beam 102 of the vehicle body through the anchor bracket 2; 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 are respectively connected with an anchor beam 21; the anchor beam 21 acts as a connecting piece and is located at each connecting frame connection. Based on the above design, the anchor beam 21 can also act as a reinforcement, thereby better ensuring the structural strength of the rear fixed structure 101.

[0044] Furthermore, in the present invention, both ends of the front cross beam 1 are connected to the rear longitudinal beam body 104 through an adapter bracket 4 respectively; the connection of the adapter bracket 4 facilitates the connection between the front cross beam 1 and the rear longitudinal beam body 104, and the adapter bracket 4 can also act as a suspension beam, which is convenient for changing the position of the front cross beam 1; the height of the adapter bracket 4 can be subsequently adjusted as needed, which can better ensure the horizontality of the front and rear end arrangements of the battery pack.

[0045] The adapter bracket 4 in the present invention includes a bracket box 41, which is hollow inside. The bracket box 41 can ensure the strength of the adapter bracket 4 while increasing the height of the adapter bracket 4. At the same time, the bracket box 41 with a hollow inside can reduce weight while facilitating the threading of subsequent fasteners.

[0046] In the present invention, the bracket box 41 is connected to the rear longitudinal beam body 104 through the support 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 installation of the bracket box 41 on the rear longitudinal beam body 104.

[0047] Furthermore, in the present invention, the support frame 3 is tilted, and based on this arrangement, the rear longitudinal beam body 104, the rear floor cross beam 102 and the rear fixed structure 101 form a triangular structure; thereby better ensuring the stability and firmness of the connection between the rear fixed structure 101 and the vehicle body.

[0048] At the same time, in the present invention, the front cross beam 1, the support frame 3 and the anchor bracket 2 are all made of aluminum alloy materials; such a configuration greatly ensures the structural strength of the front cross beam 1, the support frame 3 and the anchor bracket 2.

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

[0050] A rear floor assembly includes a rear floor body, the rear floor body includes two rear longitudinal beam bodies 104 that are relatively distributed at intervals; a rear floor cross beam 102 is provided between the two rear longitudinal beam bodies; the rear floor body is provided with the rear fixing structure 101; the two ends of the rear fixing structure 101 are respectively connected to the rear longitudinal beam body through an adapter bracket 4; the rear fixing structure 101 is connected to the rear floor cross beam 102 through an anchor beam 21; the rear fixing structure 101 disclosed in the present invention facilitates the connection between the battery pack and the vehicle body. In addition, the present invention greatly ensures the structural strength of the rear fixing structure 101 through the coordinated use of the front cross beam 1, the support frame 3 and the anchor bracket 2; and the rear of the whole vehicle is provided with the rear fixing structure 101; it can maximize the torsional mode and torsional stiffness of the whole vehicle while meeting the layout process and cost, and improve the NVH performance and operational stability performance of the whole vehicle.

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

[0052] specific:

[0053] The rear fixed structure 101 disclosed in the present invention mainly includes a front cross beam 1, a support frame 3 and an anchor bracket 2; the front cross beam 1 is connected to the anchor bracket 2 through the support frame 3; the vehicle body rear fixed structure 101 is connected to the battery pack through the front cross beam 1; the anchor bracket 2 includes two anchor beams 21 distributed at intervals, and the vehicle body rear fixed structure 101 is overlapped on the rear floor cross beam 102 of the vehicle body through the anchor bracket 2.

[0054] The present invention can maximize the torsional mode and torsional stiffness of the whole vehicle, and improve the NVH performance and operational stability performance of the whole vehicle while meeting the requirements of layout process and cost.

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

[0056] Moreover, in the present invention, the main structure of the rear fixed structure 101 is made of an aluminum frame, that is, welded from extruded aluminum square tubes. The front cross beam 1 provides a battery pack installation point and a front anchor point. The middle is a W-shaped aluminum support frame 3 as the main force transmission frame, and the lower rivet point bracket is connected to the vehicle body as a rear anchor point.

[0057] The rear fixing structure 101 disclosed in the present invention together with the vehicle body can form a plurality of triangular stable structures that support each other, and can effectively improve the torsional performance of the vehicle body.

[0058] In the present invention, the adapter bracket 4 is in the form of sheet metal self-welding, and is overlapped with the rear longitudinal beam body 104 on both sides.

[0059] The anchor beam 21 is also an aluminum tube, which is welded to the support frame 3 and connected to the rear floor cross beam 102 with bolts.

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

[0061] In addition, in the present invention, the front cross beam and the adapter bracket may be connected by welding or by other connection methods.

[0062] Based on the above design, the adapter bracket 4 of the present invention can be flexibly changed according to the position and demand, which not only meets the platformization but also ensures the flexibility of layout facing different vehicle models. It can be shared according to different vehicle models, and only needs to adjust the position of the battery pack ear and the frame connection accordingly.

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

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

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

[0066] At the same time, in the present invention, each rear longitudinal beam body 104 is provided with an adapter bracket 4; and the two adapter brackets 4 are symmetrically distributed on the left and right. When connected, the adapter bracket 4 is connected to the rear longitudinal beam body 104 by spot welding, and the supporting flange 42 of the adapter bracket 4 is required to overlap the chamfer or boss feature of the rear longitudinal beam to ensure local connection stiffness.

[0067] The rear floor beam 102 is spot-welded to the rear longitudinal beam body 104 and the rear floor beam 102 through welding surfaces. The welding surfaces ensure three-sided overlap to ensure stable and continuous force transmission at the joints, 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 the present invention is reasonable. In the oil-to-electric project, the process is reasonable and the manufacturing is convenient. The main frame beams are connected by bolts, and the basic platform body is less modified, which is convenient for installation and disassembly. The invention is light in weight and can minimize the manufacturing cost and reduce the weight of the whole vehicle while achieving the performance target.

[0070] The structural design of the present invention is reliable, and a frame beam structure is adopted to form a stable structure of five triangles, which can meet the performance improvement of NVH, increase the torsional stiffness by about 30%, and increase the torsional mode by about 8%. It also meets the requirements of different performances such as strength fatigue, safety, layout, and process, reduces the production and process simplicity, reduces weight cost, and improves product competitiveness.

[0071] The invention has an ingenious and beautiful design, and can stabilize the overall structure of the rear floor of the vehicle body, has excellent performance and low cost.

[0072] The rear fixing structure 101 disclosed in the present invention and the vehicle body structure form a structure having five triangles.

[0073] The front cross beam 1 is an aluminum profile, which provides a direct fixing point for the battery pack, so that the rear fixing structure 101 of the work card of the present invention can provide three installation points for the battery pack at the rear of the whole vehicle, that is, three battery pack installation points are added to the front cross beam 1, two of which are set on the left and right sides of the vehicle body respectively, and the fixing points on both sides are connected to the rear longitudinal beam body 104 through the sheet metal adapter bracket 4, and the third one is in the middle as much as possible, so that the three installation points are evenly distributed, the left and right sides are more balanced, and the force transmission is stable. If there are two installation points in the middle, try to make the installation points at the three equal points of the front cross beam 1.

[0074] The support frame 3 disclosed in the present invention is a W-shaped aluminum frame that is the main intermediate force transmission path between the rear floor crossbeam 102 and the rear battery pack installation point.

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

[0076] In the present invention, the various aluminum profiles are connected by welding, and the rear fixing structure 101 is designed to be bilaterally symmetrical as much as possible.

[0077] In the present invention, the fixing points of the battery packs at both ends of the front cross beam 1 coincide with the connection points between the front cross beam 1 and the adapter bracket 4. Based on this design, a secondary connection between the front cross beam 1 and the adapter bracket 4 can be achieved, which better ensures the stability of the installation connection of the front cross beam 1 on the adapter bracket 4.

[0078] In addition, in the present invention, the connection points between the battery pack and the front cross beam 1 are arranged evenly spaced on the front cross beam 1 as much as possible, and the welding position between the W-shaped support frame 3 and the front cross beam 1 is exactly located at the fixed connection position between the battery pack and the front cross beam 1.

[0079] The anchor beam 21 is connected to the rear floor cross beam 102 by bolts, and the mounting holes of the connection can be used as much as possible, for example, the mounting holes of the fuel tank, and the mounting points of the anchor beam 21 and the rear floor cross beam 102 should ensure sufficient rigidity as much as possible, such as on a bracket or beam with a closed cross-section, mainly to solve the strength of the battery pack installation point and the weak structure problem of the battery pack being twisted to the rear floor cross beam 102 by the vehicle body.

[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 two ends of the front cross beam 1 are connected to the rear longitudinal beam body 104, and the anchor bracket 2 is connected to the rear floor cross beam 102, thereby forming a continuous and stable structure in the front, back, left and right directions, ensuring that the rear fixed structure 101 transmits force continuously and stably.

[0081] Furthermore, in the present invention, the adapter bracket 4 is connected to the rear longitudinal beam body 104, and the adapter bracket 4 and the rear longitudinal beam body 104 are spot-welded via a support flange 42, and 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 the present invention is hollow inside and is attached to the rear longitudinal beam body 104 through the supporting flange 42 to form a closed cross-section, thereby solving the problem of insufficient rigidity and strength of the left and right side mounting points at the rear of the battery pack.

[0083] The rear floor cross beam 102 of the present invention mainly provides the installation points of the anchor beam 21, and the locations of the installation points are also evenly distributed in space as much as possible. It mainly solves the force transmission path of the left and right and front and back of the vehicle body.

[0084] The right connecting plate 103 of the rear floor cross beam 102 of the present invention is welded to the rear longitudinal beam body 104 and the rear floor cross beam 102 through welding surfaces; the left connecting plate 103 is symmetrical and identical to the right side, thereby reducing the number of molds.

[0085] The rear fixing structure 101 for the battery pack disclosed in the present invention has an overall beautiful structure and continuous force transmission. In addition to meeting the performance requirements of vehicle structure durability, NVH, safety, etc., it also takes weight cost into consideration due to the light weight of the aluminum profile.

[0086] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the protection scope of the present invention.

Claims

1. A rear fixing structure for a battery pack, characterized in that: Includes front crossbeam, support frame and anchor bracket; The front cross beam is connected to the anchor bracket through a support frame; The rear fixed structure of the vehicle body is connected to the battery pack via a front cross beam.

2. A rear fixing structure for a battery pack according to claim 1, characterized in that: The support frame includes a frame body, and the frame body includes a first frame, a second frame, a third frame and a fourth frame; the first frame, the second frame, the third frame and the fourth frame are connected in sequence; the first frame and the second frame are intersecting; the second frame and the third frame are intersecting; the third frame and the fourth frame are intersecting; the support frame is W-shaped.

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

4. The rear fixing structure for a battery pack according to claim 1, characterized in that: The anchor bracket includes two anchor beams distributed at intervals, and the rear fixed structure of the vehicle body is overlapped on the rear floor cross beam of the vehicle body through the anchor bracket; an anchor beam is respectively connected to the connection between the first connecting frame and the second connecting frame and the connection between the third connecting frame and the fourth connecting frame.

5. The rear fixing structure for a battery pack according to claim 1, characterized in that: The two ends of the front cross beam are respectively connected to the rear longitudinal beam body through an adapter bracket.

6. A rear fixing structure for a battery pack according to claim 5, characterized in that: The adapter bracket includes a bracket box, and the bracket box is connected to the rear longitudinal beam body through a supporting flange.

7. The rear fixing structure for a battery pack according to claim 5, characterized in that: The support frame is tilted, and the front cross beam, the support frame and the anchor bracket are all made of aluminum alloy material.

8. The rear fixing structure for a battery pack according to claim 5, characterized in that: The front cross beam and the anchor beam have rectangular vertical cross sections.

9. A rear floor assembly, characterized in that: It includes a rear floor body, which includes two rear longitudinal beam bodies that are relatively distributed at intervals; 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 to 8; the two ends of the rear fixing structure are respectively connected to the rear longitudinal beam body through an adapter bracket; the rear fixing structure is connected to the rear floor crossbeam through an anchor beam.

10. The rear floor assembly according to claim 9, characterized in that: The two ends of the rear floor cross beam are respectively connected to the rear longitudinal beam body through a cross beam connecting plate.

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