A flexible connection structure for power batteries in lightweight off-road electric vehicles

Abstract

This utility model relates to the field of battery pack installation technology and discloses a flexible connection structure for the power battery of a lightweight off-road electric vehicle. It includes a battery pack and frame longitudinal beams disposed on both sides of the battery pack. Cantilever arm supports are fixedly installed on both sides of the battery pack, and a first inclined surface is provided on the cantilever arm supports. Inclined support supports are provided on the frame longitudinal beams located on both sides of the battery pack, and a second inclined surface is provided on the inclined support supports. The first and second inclined surfaces correspond to each other, with the first inclined surface positioned above the second inclined surface. A shock-absorbing pad is fixedly installed on either the first or second inclined surface, abutting against the other inclined surface. This utility model, by incorporating flexible structural components and assembling them into a trapezoidal structure, protects the battery pack structure and increases passenger comfort.

Description

Technical Field

[0001] This utility model relates to the field of battery pack installation technology, and in particular to a flexible connection structure for power batteries of lightweight off-road electric vehicles. Background Technology

[0002] The battery pack of a new energy electric vehicle is one of the core components of the power system. It is responsible for storing electrical energy and providing power to the electric drive axle, electronic control equipment and related electronic devices.

[0003] The structure used to install battery packs in conventional commercial vehicles mainly relies on external connecting mechanisms to connect with the vehicle chassis, and then fix them with multiple bolt groups. The main concern is the connection stability of the battery pack.

[0004] Most commercial vehicles primarily function as load-bearing vehicles, and the road conditions are generally good. Considering this, the entire battery pack is mostly fixed directly with a rigid connection. A small number of vehicles use a flexible connection structure between the battery pack and the frame to adjust the vehicle's resonance frequency and protect the battery. However, these structures generally take up more space and increase costs. Furthermore, while they protect the battery during large torsional displacements, they cannot provide the same support as a rigid connection.

[0005] The challenging road conditions of off-road vehicles significantly increase the risk of failure due to rigid torsional displacement of the battery pack casing. However, because the battery casing occupies a large area, it is necessary to rely on the rigid support provided by the casing to cope with bending and torsional deformation under these conditions. To address these issues, an installation structure and connection method for a power battery in off-road vehicles are proposed. Utility Model Content

[0006] The purpose of this invention is to provide a flexible connection structure for the power battery of a lightweight off-road electric vehicle. By setting flexible structural components and combining them into a trapezoidal structure, the safety of the battery pack structure is protected and the ride comfort is increased.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0008] A flexible connection structure for a power battery of a lightweight off-road electric vehicle includes a battery pack and frame longitudinal beams disposed on both sides of the battery pack. Cantilever brackets are fixedly disposed on both sides of the battery pack. A first inclined surface is disposed on the cantilever bracket. Inclined support brackets are disposed on the frame longitudinal beams located on both sides of the battery pack. A second inclined surface is disposed on the inclined support bracket. The first and second inclined surfaces correspond to each other, with the first inclined surface located above the second inclined surface. A shock-absorbing pad is fixedly disposed on the first inclined surface, and the shock-absorbing pad abuts against the second inclined surface.

[0009] As a further feature of this invention, the cantilever bracket, the inclined support bracket, and the shock-absorbing pad are arranged in multiple sets at intervals on each side of the battery pack and are symmetrically arranged relative to the battery pack.

[0010] As a further feature of this invention, multiple cantilever brackets are fixedly connected to an upper connecting beam, the upper connecting beam is fixedly connected to a lower support beam, and the upper connecting beam is connected to the battery pack.

[0011] As a further feature of this invention, the upper connecting beam and the battery pack are detachably connected via a locking component.

[0012] As a further feature of this invention, the locking component includes a quick-connect bolt.

[0013] As a further feature of this utility model, a support beam is fixedly installed between the inclined support brackets located on both sides of the battery pack. The support beam is located below the battery pack, and a gap is provided between the bottom surface of the battery pack and the upper surface of the support beam.

[0014] As a further feature of this invention, a limiting member is fixedly connected to the inclined support bracket, and both ends of the support beam abut against the limiting member.

[0015] As a further feature of this invention, the shock-absorbing pad is made of rubber.

[0016] The beneficial effects of this utility model are:

[0017] This invention features a V-shaped design on the load-bearing bracket. During battery pack installation and use, the battery pack will shift downwards due to its own weight, resulting in tighter gaps. A few connecting bolts are sufficient to prevent the battery pack from falling off. When maintenance is needed, simply loosen a few connecting bolts, use a lifting trolley to lift the battery pack upwards, and it can be easily removed, facilitating disassembly and maintenance.

[0018] This invention, by incorporating a rigid crossbeam with a hard connection structure and a flexible battery pack connection structure, can control the bending and torsional stress displacement of the vehicle frame under extreme off-road conditions, thereby improving the tearing limit stress on weak links such as the vehicle body. Simultaneously, the flexible battery pack connection structure avoids resonance between the battery pack and the vehicle frame, improving overall vehicle NVH (noise, vibration, and harshness). Furthermore, the slight displacement of the soft pads under bending and torsional stress helps improve force transmission and protects the structural strength of the battery pack casing. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure from the main view of this embodiment;

[0021] Figure 2 This is a cross-sectional view of the structure in this embodiment;

[0022] Figure 3 This is a schematic diagram of the isometric view structure in this embodiment;

[0023] Figure 4 This is a schematic diagram of the rigid connection support assembly and connecting beam assembly of the crossbeam in this embodiment;

[0024] In the diagram, 1 is the longitudinal beam of the main frame; 2 is the rigid connection support assembly of the crossbeam; 201 is the inclined support bracket; 202 is the support crossbeam; 203 is the limiting component; 3 is the shock-absorbing pad; 4 is the battery pack; 5 is the locking component; 6 is the connecting beam assembly; 601 is the cantilever bracket; 602 is the upper connecting beam; and 603 is the lower support beam. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0026] A flexible connection structure for the power battery of a lightweight off-road electric vehicle, reference Figures 1 to 4 It includes a battery pack 4 and frame longitudinal beams located on both sides of the battery pack 4, and the frame longitudinal beams are fixedly connected to the vehicle chassis.

[0027] The battery pack 4 is connected to a connecting beam assembly 6. The connecting beam assembly 6 includes an upper connecting beam 602 that is horizontally fixed to both sides of the battery pack 4 and is detachably connected to the battery pack 4. The upper connecting beam 602 is connected to a lower support beam 603. The lower support beam 603 is welded to the upper connecting beam 602 to form an integral whole. The lower support beam 603 is horizontally limited to the lower edges of both sides of the battery pack 4. A cantilever bracket 601 is fixedly connected to the outer side of the upper connecting beam 602 by welding. It serves as the main load-bearing bracket for flexible connection. A first inclined surface is provided below the cantilever bracket 601, and a shock-absorbing pad 3 is fixedly provided on the first inclined surface.

[0028] The vehicle frame longitudinal beams are connected to a crossbeam rigid connection support assembly 2. The crossbeam rigid connection support assembly includes inclined support brackets 201 that are welded and fixed to the vehicle frame longitudinal beams on both sides of the battery pack 4. A second inclined surface is provided above the inclined support brackets 201. The inclined support brackets 201 correspond to the cantilever brackets 601. The first inclined surface corresponds to the second inclined surface, and the shock-absorbing pad 3 abuts against the second inclined surface. Through this arrangement, the second inclined surface on the inclined support brackets 201 on both sides of the battery pack 4 forms a V-shaped groove structure, and the first inclined surface on the cantilever brackets 601 on both sides of the battery pack 4 forms a V-shaped boss, with a shock-absorbing pad 3 provided in the middle. The three cooperate with each other. Under the action of the weight of the battery pack 4, the structure presents an installation posture that becomes tighter and tighter, and can also form a shock absorption effect between the battery pack 4 and the vehicle chassis.

[0029] In the above structure, the cantilever bracket 601, the inclined support bracket 201, and the shock-absorbing pad 3 are all provided in three sets, which are evenly distributed in the front, middle and rear load-bearing areas of the battery pack 4. The middle part is located below the center of gravity of the battery pack 4, and the front and rear parts are equally spaced at 1 / 6 and 5 / 6 of the total length of the battery, and the spacing is adjusted according to the battery counterweight state.

[0030] Furthermore, among the three sets of inclined support brackets 201 on both sides of the battery pack 4, a support beam 202 is fixedly connected between the opposing inclined support brackets 201. The support beam 202 is located below the battery pack 4 and has a gap with the battery pack 4 to provide vibration space for the battery pack 4. A limiting member 203 is fixedly connected to the inclined support bracket 201. The two ends of the support beam 202 abut against the limiting member 203. The limiting member 203 is used to limit the support beam 202. The function of the support beam 202 is threefold: firstly, it forms a rigid support for the vehicle frame to increase the overall structural rigidity; secondly, in abnormal road conditions, the combined structural force formed with the battery pack 4 controls the torsional deformation of the vehicle frame and protects the stress intensity of the battery shell; and thirdly, in the event of an accident, it restricts the battery pack 4 from falling out, further improving safety performance.

[0031] Furthermore, the upper connecting beam 602 and the battery pack 4 are detachably connected by a locking component 5. The locking component 5 includes a quick-connect bolt with a V-shaped limiting groove in the middle and a locking part fixed on the lower support beam. The battery pack 4, the upper connecting beam 602 and the lower support beam are connected together by the action of the quick-connect bolt.

[0032] The shock-absorbing pad 3 is fixedly connected to the cantilever bracket 601 by bolts. It is made of rubber. The radial stiffness of the selected rubber structure shock-absorbing pad 3 far exceeds the axial stiffness. Through the action of the shock-absorbing pad 3, under the effect of the weight of the battery pack 4, it can isolate the road frequency vibration of the frame, protect the safety of the battery shell structure, and increase the ride comfort.

[0033] The crossbeam 202 structure, along with the first inclined plane, the second inclined plane, and the shock-absorbing pad 3, are combined to form a trapezoidal structure, which improves the overall rigidity of the frame. When facing bending and torsional stress under special road conditions, the rigidity of the trapezoidal structure is used to constrain the torsional displacement of the frame under impact, thereby improving the overall rigidity of the vehicle and extending its service life.

[0034] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A flexible connection structure of a power battery for a light off-road electric vehicle, characterized in that, The system includes a battery pack (4) and a frame longitudinal beam disposed on both sides of the battery pack (4). A cantilever bracket (601) is fixedly disposed on both sides of the battery pack (4). A first inclined surface is disposed on the cantilever bracket (601). An inclined surface support bracket (201) is disposed on the frame longitudinal beam and located on both sides of the battery pack (4). A second inclined surface is disposed on the inclined surface support bracket (201). The first inclined surface and the second inclined surface correspond to each other and the first inclined surface is located above the second inclined surface. A shock-absorbing pad (3) is fixedly disposed on the first inclined surface and abuts against the second inclined surface.

2. The flexible connection structure of the power battery of the light off-road electric vehicle according to claim 1, characterized in that, The cantilever bracket (601), inclined support bracket (201) and shock-absorbing pad (3) are arranged in multiple sets at intervals on each side of the battery pack (4) and are symmetrically arranged relative to the battery pack (4).

3. The flexible connection structure of the power battery of the light off-road electric vehicle according to claim 2, characterized in that, Multiple cantilever brackets (601) are fixedly connected to an upper connecting beam (602), the upper connecting beam (602) is fixedly connected to a lower support beam (603), and the upper connecting beam (602) is connected to the battery pack (4).

4. The flexible connection structure of the power battery of the light off-road electric vehicle according to claim 3, characterized in that, The upper connecting beam (602) and the battery pack (4) are detachably connected by a locking component (5).

5. The flexible connection structure of the power battery of the light off-road electric vehicle according to claim 4, characterized in that, The locking component (5) includes a quick-connect bolt.

6. The flexible connection structure of the power battery of the light off-road electric vehicle according to claim 2, characterized in that, A support beam (202) is fixedly installed between the inclined support brackets (201) on both sides of the battery pack (4). The support beam (202) is located below the battery pack (4), and a gap is provided between the bottom surface of the battery pack (4) and the upper surface of the support beam (202).

7. The flexible connection structure of the power battery of the light off-road electric vehicle according to claim 6, characterized in that, The inclined support bracket (201) is fixedly connected to a limiting member (203), and the two ends of the support beam (202) abut against the limiting member (203).

8. The flexible connection structure of a power battery of a light off-road electric vehicle according to claim 1, characterized in that, The shock-absorbing pad (3) is made of rubber.

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