Lightweight back battery box

Abstract

A lightweight back battery box belongs to the technical field of power battery assembly and comprises a frame main body, a plurality of battery fixing frames are uniformly arranged in the frame main body at intervals, each battery fixing frame comprises two L-shaped plates, the two L-shaped plates are symmetrically arranged on the two sides in the frame main body, a sealing plate is arranged on the periphery of the frame main body, and the sealing plates are arranged on the periphery of the frame main body. A connecting frame is arranged on the bottom side of the frame body, and the frame body is fixed to a vehicle longitudinal beam through the connecting frame. The light-weight back battery box disclosed by the utility model is reasonable in design and simple in structure, the types of parts are simplified through the design of the L-shaped plates, the weight is light, the assembly is convenient, and the light weight of the back battery box is realized; meanwhile, through the cooperation between the frame main body and the battery fixing frame and the cooperation between the frame main body and the connecting frame, the structural strength of the battery box is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of power battery assembly technology, and in particular to a lightweight rear battery box. Background Technology

[0002] Rear battery packs, especially those designed for mining trucks or certain special vehicles, have unique characteristics and requirements. A rear battery pack is a box structure installed at the rear of a vehicle (such as a mining truck or some electric freight trucks) to house, secure, and protect the battery pack. Therefore, rear battery packs generally possess the kinetic functions of carrying, securing, and protecting the batteries. A rear battery pack typically consists of a frame-type base, uprights, crossbars, and a skin. The base is bolted to the vehicle frame, the uprights and crossbars form a supporting structure, and the batteries are placed within the formed cavity.

[0003] Currently, most rear battery box frames on the market are made of low-alloy steel, which has disadvantages such as low strength, heavy weight, and poor corrosion resistance. In particular, weld cracks are prone to occur at the connection between the upper part of the frame and the sub-beam. Moreover, most frames can only be compatible with one type of battery capacity, resulting in low versatility. At the same time, the sealing plate material of the rear battery box is mostly steel plate with a thickness of less than 1mm. In actual assembly, defects such as bulging and warping are easily caused by hole position errors, which can lead to abnormal noises from the sealing plate during vehicle operation.

[0004] With the development of electric motor, battery, and electronic control technologies, new energy medium and heavy-duty trucks are gradually leading the commercial vehicle market due to their advantages such as energy saving, emission reduction, cost savings, and high driving comfort. New energy commercial vehicles generally use a rear battery pack frame to secure the power battery. Previously, high-voltage accessories such as the high-voltage distribution box, BMS, and air conditioning were all located inside the rear battery pack frame. However, because existing rear battery pack frames can only accommodate one type of battery and are mostly made of low-alloy steel with a yield strength ≤500MPa, the frames suffer from disadvantages such as large size, heavy weight, low strength, and low corrosion resistance. Furthermore, the rear battery pack sealing plates are prone to rattling due to assembly and deformation. Utility Model Content

[0005] To address the issues of excessive weight and low strength in current rear battery box frames, this invention provides a lightweight rear battery box.

[0006] To solve the aforementioned technical problems, the present invention adopts a technical solution comprising a frame body, inside which a plurality of battery mounting brackets are arranged evenly at intervals from bottom to top, with the uppermost battery mounting bracket forming a battery mounting space of equal volume between it and the top side of the frame body, and between every two adjacent battery mounting brackets. Each battery mounting bracket includes two L-shaped plates, the length of which corresponds to the length of the frame body. The two L-shaped plates are symmetrically arranged on both sides inside the frame body, with their open sides facing each other, and the spacing between the two L-shaped plates is adapted to the width of the battery. A sealing plate is provided around the frame body, thus forming a complete box structure. A connecting frame is provided on the bottom side of the frame body, and the frame body is fixed to the vehicle's longitudinal beam via the connecting frame. In this preferred embodiment, through the design of the battery mounting bracket, only two symmetrically arranged L-shaped plates are needed to install the battery, simplifying the types of components, reducing weight, and facilitating assembly, thus achieving a lightweight rear battery box. Simultaneously, this L-shaped plate design effectively increases the connection area and improves the structural strength of the frame body.

[0007] Preferably, the frame body includes two symmetrically arranged rectangular support frames, with a supporting layer for mounting the battery holder between the two rectangular support frames. The two sides of the supporting layer are connected to the two rectangular support frames respectively, thus forming a complete frame body. In this preferred embodiment, the frame body has a simple structure and is easy to assemble.

[0008] Preferably, the supporting layer includes several evenly spaced connecting beams, with each end of the connecting beam connected to two square frame supports. In this preferred embodiment, the structure of the supporting layer is simple and easy to assemble.

[0009] Preferably, the frame support is made of high-strength steel, and the connecting beams are made of rectangular steel pipes. In this preferred embodiment, the frame support and connecting beams are readily available and have high strength.

[0010] Preferably, the spacing between the two rectangular support frames is adapted to the width of the frame body and the width of the battery, thus allowing the L-shaped plate to connect both the rectangular support frames and the connecting beam. In this preferred embodiment, the above design enables all components to form a whole, thereby greatly improving the structural strength of the frame body.

[0011] Preferably, the connecting frame includes two symmetrically arranged secondary beams located on the bottom side of the main frame body. Several crossbeams are arranged between the two secondary beams, with each end of a crossbeam connected to one of the two secondary beams, thus forming a complete connecting frame. In this preferred embodiment, the connecting frame has a simple structure and is easy to assemble.

[0012] Preferably, the secondary beams are made of channel steel, with the open sides of the two secondary beams facing each other, and several reinforcing plates are installed inside the secondary beams. In this preferred embodiment, the structural strength of the connecting frame is greatly improved through the design of the reinforcing plates.

[0013] Preferably, a vertical brace is provided between the top side of the secondary beam and the upright beam of the square frame support, and a horizontal brace is provided between the outer side of the secondary beam and the horizontal beam of the square frame support at the bottom. In this preferred embodiment, the structural strength of the connecting frame is further improved through the design of the above-mentioned vertical and horizontal braces.

[0014] Preferably, the horizontal portion of the L-shaped plate has several battery mounting holes. In this preferred embodiment, the L-shaped plate, through the above design, can accommodate different battery models, greatly improving the adaptability of the battery holder.

[0015] Preferably, the vertical corners of the frame body are provided with L-shaped sealing edges for sealing the joints of the sealing plates. In this preferred embodiment, the sealing plate design improves the airtightness of the battery box, preventing water ingress and thus solving the problem of corrosion at the corners.

[0016] As can be seen from the above technical solutions, the advantages of this utility model are as follows: This solution provides a lightweight rear battery box with a reasonable design and simple structure. The L-shaped plate design simplifies the types of parts, making it lightweight and easy to assemble, thus achieving a lightweight rear battery box. At the same time, the cooperation between the frame body and the battery fixing frame, as well as between the frame body and the connecting frame, greatly improves the structural strength of this battery box. Furthermore, the sealing plate uses composite materials, which have high rigidity and strength, and are lightweight, solving the problem of abnormal noise from alloy steel sealing plates. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the description 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.

[0018] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.

[0019] Figure 2 This is a structural schematic diagram of the frame body and connecting frame of a specific embodiment of this utility model.

[0020] Figure 3 This is a schematic diagram of the main frame structure of a specific embodiment of this utility model.

[0021] Figure 4This is a schematic diagram of the connection frame in a specific embodiment of the present utility model.

[0022] 1. Main frame; 2. Sealing plate; 3. Connecting frame; 301. Sub-beam; 302. Crossbeam; 4. Square frame bracket; 401. Connecting beam; 402. Square frame upright beam; 403. Square frame crossbeam; 5. Battery mounting bracket; 501. L-shaped plate; 6. Vertical and diagonal braces; 7. Horizontal and diagonal braces; 8. Reinforcing plate; 9. L-shaped edge sealing; 10. Charging port bracket; 11. Expansion tank bracket. Detailed Implementation

[0023] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0024] Please refer to the attached document. Figure 1-4 The following is a description of a specific embodiment: The lightweight rear battery box of this utility model includes a frame body 1 made of high-strength steel. Inside the frame body 1, a plurality of battery mounting brackets 5 are arranged evenly at intervals from the bottom side upwards. The battery mounting bracket 5 located at the top and the top side of the frame body 1, as well as between every two adjacent battery mounting brackets 5, form a battery installation space of the same volume.

[0025] Specifically, the main frame 1 includes two symmetrically arranged rectangular support frames 4. A supporting layer for mounting a battery holder 5 is provided between the two rectangular support frames 4. The two sides of the supporting layer are connected to the two rectangular support frames 4 respectively, thus forming a complete main frame 1. The structure of the main frame 1 is simple and easy to assemble.

[0026] Specifically, the support layer includes several evenly spaced connecting beams 401. The connecting beams 401 are made of rectangular steel pipes, and both ends of the connecting beams 401 are connected to two square frame supports 4 respectively. The structure of the above-mentioned support layer is simple, easy to obtain materials, and convenient to assemble.

[0027] The battery mounting bracket 5 includes two L-shaped plates 501. The length of the L-shaped plates 501 corresponds to the length of the frame body 1. The two L-shaped plates 501 are symmetrically arranged on both sides inside the frame body 1, and the open sides of the two L-shaped plates 501 face each other. The distance between the two L-shaped plates 501 is adapted to the width of the battery. Several battery fixing holes are provided on the horizontal part of the L-shaped plates 501. The battery mounting bracket 5 installs the battery through the battery fixing holes on its L-shaped plates 501. The design of the battery fixing holes can also accommodate different models of batteries.

[0028] Specifically, the spacing between the two rectangular support brackets 4 is adapted to the width of the frame body 1 and the width of the battery, thus enabling the L-shaped plate 501 to simultaneously connect the rectangular support brackets 4 and the connecting beam 401. This design allows all components to form a unified whole, significantly improving the structural strength of the frame body 1.

[0029] The frame body 1 is surrounded by a sealing plate 2, thus forming a complete box structure. The frame body 1 is also provided with a connecting frame 3 on its bottom side. The frame body 1 is fixed to the vehicle longitudinal beam through the connecting frame 3.

[0030] Specifically, the connecting frame 3 includes two symmetrically arranged secondary beams 301, which are located on the bottom side of the frame body 1. Several crossbeams 302 are arranged between the two secondary beams 301, and the two ends of the crossbeams 302 are connected to the two secondary beams 301 respectively, thereby forming a complete connecting frame 3. The connecting frame 3 has a simple structure and is easy to assemble.

[0031] In one embodiment, the secondary beam 301 is made of channel steel, the open sides of the two secondary beams 301 face each other, and several reinforcing plates 8 are provided inside the secondary beams 301. The design of the reinforcing plates 8 greatly improves the structural strength of the connecting frame 3.

[0032] In one embodiment, a vertical brace 6 is provided between the top side of the secondary beam 301 and the upright beam 402 of the square frame support 4, and a horizontal brace 7 is provided between the outer side of the secondary beam 301 and the horizontal beam 403 of the square frame support 4 at the bottom. The design of the vertical brace 6 and the horizontal brace 7 further improves the structural strength of the connecting frame 3.

[0033] In one embodiment, the vertical corners of the frame body 1 are provided with L-shaped sealing edges 9 for sealing the joints of the sealing plates 2. This L-shaped sealing edge 9 design improves the sealing performance of the battery box, preventing water ingress and thus solving the problem of corrosion at the corners.

[0034] In one embodiment, to further improve the convenience of the battery box, an expansion tank bracket 11 is provided inside one of the battery installation spaces, and a charging port bracket 10 is provided at one end of the bottom side of the frame body 1.

[0035] The battery box is fixed to the vehicle's longitudinal beam via a connecting frame 3. The battery is arranged inside the battery mounting space and fixed to the battery mounting bracket 5. The battery mounting bracket 5 adopts a symmetrical design with two L-shaped plates 501. The battery can be installed using these two components, simplifying the types of parts, reducing weight, and facilitating assembly, thus achieving a lightweight rear battery box. This design of the L-shaped plates 501 effectively increases the connection area. The L-shaped plates 501 are connected to the square frame bracket 4 and connecting beam 401 of the frame body 1, improving the structural strength of the frame body 1, thereby improving the structural strength of the battery box. Furthermore, the L-shaped plates 501 have several battery mounting holes, allowing the battery mounting bracket 5 to accommodate different battery models, providing strong versatility. Vertical and horizontal braces 6 and 7 are added between the frame body 1 and the connecting frame 3 to protect the connection points from cracking, further improving the structural strength of the battery box. The sealing plate 2 can be made of composite material, offering high rigidity and strength while being lightweight, thus solving the problem of noise from alloy steel sealing plates. The L-shaped sealing edge design at the joint of the sealing plate 2 greatly improves the sealing performance of the battery box, avoids water ingress, and solves the problem of corrosion at the corners.

[0036] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0037] The terms "upper," "lower," "outer," "inner," etc., used in the specification, claims, and accompanying drawings of this utility model, are used to distinguish relative positional relationships and are not necessarily qualitative. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0038] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lightweight rear battery box, comprising a frame body (1), characterized in that, Inside the frame body (1), a number of battery mounting brackets (5) are arranged evenly upwards from the bottom side. The battery mounting bracket (5) at the top and the top side of the frame body (1) form a battery installation space of the same volume between each two adjacent battery mounting brackets (5). The battery mounting bracket (5) includes two L-shaped plates (501). The length of the L-shaped plates (501) corresponds to the length of the frame body (1). The two L-shaped plates (501) are symmetrically arranged on both sides inside the frame body (1). The open sides of the two L-shaped plates (501) face each other, and the distance between the two L-shaped plates (501) is adapted to the width of the battery. The frame body (1) is surrounded by a sealing plate (2) to form a complete box structure. The bottom side of the frame body (1) is provided with a connecting frame (3). The frame body (1) is fixed to the vehicle longitudinal beam through the connecting frame (3).

2. The lightweight rear battery box according to claim 1, characterized in that, The main frame (1) includes two symmetrically arranged square frame supports (4), and a support layer for installing a battery mounting bracket (5) is provided between the two square frame supports (4). The two sides of the support layer are connected to the two square frame supports (4) respectively, thus forming a complete main frame (1).

3. A lightweight rear battery case according to claim 2, characterized in that, The supporting layer includes several evenly spaced connecting beams (401), with both ends of the connecting beams (401) connected to two square frame supports (4).

4. A lightweight rear battery box according to claim 3, characterized in that, The square frame support (4) is made of high-strength steel, and the connecting beam (401) is made of rectangular steel pipe.

5. A lightweight rear battery case according to claim 4, characterized in that, The spacing between the two square brackets (4) is such that the width of the frame body (1) is adapted to the width of the battery, so that the L-shaped plate (501) can connect the square brackets (4) and the connecting beam (401) at the same time.

6. A lightweight rear battery case according to claim 1 or 5, characterized in that, The connecting frame (3) includes two symmetrically arranged sub-beams (301). The sub-beams (301) are located on the bottom side of the frame body (1). Several crossbeams (302) are arranged between the two sub-beams (301). The two ends of the crossbeams (302) are connected to the two sub-beams (301) respectively, thus forming a complete connecting frame (3).

7. A lightweight rear battery case according to claim 6, characterized in that, The sub-beams (301) are made of channel steel, the open sides of the two sub-beams (301) are opposite each other, and the interior of the sub-beams (301) is provided with several reinforcing plates (8).

8. A lightweight rear battery case according to claim 7, characterized in that, A vertical brace (6) is provided between the top side of the sub-beam (301) and the square frame upright beam (402) of the square frame support (4), and a horizontal brace (7) is provided between the outer side of the sub-beam (301) and the square frame horizontal beam (403) at the bottom side of the square frame support (4).

9. A lightweight rear battery case according to claim 8, characterized in that, Several battery fixing holes are provided on the horizontal part of the L-shaped plate (501).

10. A lightweight rear battery case according to claim 9, characterized in that, The vertical corners of the frame body (1) are provided with L-shaped sealing edges (9) for sealing the butt joints of the sealing plate (2).

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