Beam and frame structure for battery pack

Abstract

The utility model discloses a cross beam and frame structure for a battery pack, which comprises a frame and a cross beam, and the frame and the cross beam are in reinforced connection through at least one corner connecting piece, each corner connecting piece comprises a first connecting plate, a second connecting plate, a third connecting plate and a hollow cavity, wherein the first connecting plate, the second connecting plate and the third connecting plate are connected in pairs at included angles, and the hollow cavity is defined by the first connecting plate, the second connecting plate and the third connecting plate. The frame and the cross beam are connected through the corner connecting pieces, direct welding connection of the cross beam and the frame is avoided, and therefore the connecting strength of the cross beam and the frame is improved, and the vibration failure risk caused by direct welding of the frame and the cross beam is reduced.

Description

Technical Field

[0001] This utility model relates to the field of power battery pack design technology for new energy vehicles, and in particular to a crossbeam and frame structure for a battery pack. Background Technology

[0002] my country's research and verification of the reliability and safety of power battery packs for new energy vehicles are among the world's best. The "GB 38031-2020 Safety Requirements for Power Batteries for Electric Vehicles" stipulates that after a vibration test, the battery pack should show no leakage, casing rupture, fire, or explosion. Most automakers also require that after the battery pack vibration test, there should be no casing rupture upon disassembly.

[0003] Whether using aluminum or steel frame structures, the crossbeams play a crucial role in enhancing the overall rigidity and strength of the enclosure. Among enclosure failures, weld failures between the crossbeams and the frame account for a significant proportion. These weld failures are caused by two main factors: firstly, the quality of the welds; and secondly, inadequate design, where stress concentration occurs at the connection point due to the transmission of force from the frame to the crossbeam during vibration, resulting in weld failure.

[0004] Utility model patent application CN202020515021.8 discloses a battery tray and battery pack, in which the triangular bracing reinforcement of the crossbeam and frame is made of aluminum and is used for aluminum profile housings; its application to steel housings is not described. Furthermore, utility model patent application CN202122706386.6 discloses a housing and battery pack, in which the crossbeam and frame are reinforced with bent parts, resulting in weaker reinforcement.

[0005] Strengthening the crossbeams and frame structure of the battery pack, reducing the risk of welding failure of the crossbeams and frame, and improving the safety and reliability of the battery pack have become increasingly urgent technical problems to be solved. Utility Model Content

[0006] To address the aforementioned issues, this utility model provides a crossbeam and frame structure for a battery pack, which is low in cost and improves the reliability and safety of the battery pack.

[0007] The purpose of this utility model is to provide a crossbeam and frame structure for a battery pack, including a frame and a crossbeam, wherein the frame and the crossbeam are reinforcedly connected by at least one corner connector.

[0008] The corner connector includes a first connecting plate, a second connecting plate, and a third connecting plate connected at an angle to each other, as well as a hollow cavity formed by the first connecting plate, the second connecting plate, and the third connecting plate.

[0009] Furthermore, the first connecting plate, the second connecting plate, and the third connecting plate have a plate-like structure, the first connecting plate can fit against the frame, and the second connecting plate can fit against the crossbeam.

[0010] Furthermore, the first connecting plate is fastened to the frame by welding, and the second connecting plate is fastened to the crossbeam by welding.

[0011] Furthermore, the welding process employs MIG welding.

[0012] Furthermore, the corner connector is a triangular brace.

[0013] Furthermore, the battery pack has an aluminum profile casing, and the triangular support is a one-piece molded design.

[0014] Furthermore, the battery pack is a steel box, and the triangular support is composed of bent parts welded together, using a double-shielded welding process.

[0015] Furthermore, the left and right sides of both ends of the crossbeam are connected to the frame by triangular braces.

[0016] This invention employs a corner connector reinforcement structure, welding the frame and crossbeam separately. This avoids direct welding between the crossbeam and the frame, thereby increasing the connection strength between the crossbeam and the frame and reducing the risk of vibration failure caused by direct welding. Furthermore, the corner connector uses a triangular brace, facilitating assembly and disassembly. Simulation analysis shows a significant reduction in stress, and combined with actual vibration effects, a significantly increased pass rate. Therefore, the aforementioned corner connector reinforcement structure has a low cost, and the benefits far outweigh the increased cost, improving the reliability and safety of the battery pack.

[0017] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an overall axonometric perspective view of a crossbeam and frame structure for a battery pack according to an embodiment of this utility model;

[0020] Figure 2This is a partially enlarged schematic diagram of the corner connector, frame, and crossbeam at connection position I in this embodiment of the present invention.

[0021] The labels for the attached figures are as follows: 1-frame; 2-beam; 3-triangular brace; 31-first connecting plate; 32-second connecting plate; 33-third connecting plate. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] like Figure 1 The present invention discloses a crossbeam and frame structure for a battery pack. The structure includes a frame and a crossbeam, which are reinforced by at least one corner connector. Each corner connector comprises a first connecting plate, a second connecting plate, and a third connecting plate connected at an included angle, as well as a hollow cavity formed by the first, second, and third connecting plates. By using corner connectors to connect the frame and the crossbeam respectively, direct welding between the crossbeam and the frame is avoided, thereby improving the connection strength between the crossbeam and the frame and reducing the risk of vibration failure caused by direct welding between the frame and the crossbeam.

[0024] Specifically, such as Figure 1 , 2 As shown, Figure 2 yes Figure 1The enlarged view at point I shows that the battery pack beam and frame structure includes a frame 1, a beam 2, and corner connectors 3. The corner connectors 3 include a first connecting plate 31, a second connecting plate 32, and a third connecting plate 33. All three plates are plate-shaped. The first connecting plate 31 is fitted to the frame and secured to it by welding. The second connecting plate 32 is fitted to the beam and secured to it by welding. The corner connectors 3 are triangular supports, integrally formed. The left and right sides of both ends of the beam are connected to the frame via triangular supports and welded using a double-shielded welding process. Preferably, for aluminum profile housings, integrally formed triangular supports are used. The installation process includes the following steps: First, position the battery pack beam 2 and align it with the battery pack frame 1; second, place the triangular supports on the left and right sides of the beam 2; third, connect the triangular supports to the frame 1 and the beam 2 using a welding process. By placing triangular braces on the outside to reinforce the battery pack's frame and crossbeams, the connection strength between the crossbeams and the frame is improved, reducing the risk of vibration failure caused by direct welding between the frame and the crossbeams.

[0025] In this embodiment of the utility model, for the steel box body, the triangular brace can be formed by welding bent parts together to form an integral triangular brace, and is also connected by a two-stage welding process.

[0026] In this embodiment of the utility model, the triangular brace is easy to assemble and disassemble. Through simulation analysis, the stress is significantly reduced, and combined with the actual vibration effect, the pass rate is significantly increased. Thus, the cost of the above-mentioned corner connector reinforcement structure is low, and the benefits achieved far outweigh the increased cost, thereby improving the reliability and safety of the battery pack.

[0027] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crossbeam and frame structure for a battery pack, characterized in that, Includes a frame and a crossbeam, which are reinforced by at least one corner connector, wherein, The corner connector includes a first connecting plate, a second connecting plate, and a third connecting plate connected at an angle to each other, as well as a hollow cavity formed by the first connecting plate, the second connecting plate, and the third connecting plate.

2. The crossbeam and frame structure for a battery pack according to claim 1, characterized in that, The first connecting plate, the second connecting plate and the third connecting plate are plate-shaped structures. The first connecting plate can fit with the frame and the second connecting plate can fit with the crossbeam.

3. The crossbeam and frame structure for a battery pack according to claim 2, characterized in that, The first connecting plate is fastened to the frame by welding, and the second connecting plate is fastened to the crossbeam by welding.

4. The crossbeam and frame structure for a battery pack according to claim 3, characterized in that, The welding process uses MIG welding.

5. The crossbeam and frame structure for a battery pack according to any one of claims 1-4, characterized in that, The corner connector is a triangular brace.

6. The crossbeam and frame structure for a battery pack according to claim 5, characterized in that, The battery pack has an aluminum profile casing, and the triangular support is a one-piece molded design.

7. The crossbeam and frame structure for a battery pack according to claim 5, characterized in that, The battery pack is a steel box, and the triangular support is composed of bent parts welded together, using a double-shielded welding process.

8. The crossbeam and frame structure for a battery pack according to claim 6 or 7, characterized in that, The left and right sides of both ends of the crossbeam are connected to the frame by triangular braces.

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