High-strength battery bottom support structure

Abstract

The utility model discloses a high-strength battery bottom support structure which comprises frame auxiliary beams used for being connected with a girder of a whole vehicle, the frame auxiliary beams are arranged in parallel in pairs, and a rectangular frame structure is connected to the upper portions of the frame auxiliary beams. The rectangular frame structure comprises a front mounting beam and a rear mounting beam which are perpendicular to the frame auxiliary beam, and a left mounting beam and a right mounting beam which are parallel to the frame auxiliary beam; a connecting and fixing plate is connected above the rectangular frame structure; a plurality of vertical beams connected with the front mounting beam and the rear mounting beam are distributed in the rectangular frame structure; first cross beams and second cross beams are arranged in the rectangular frame structure, the first cross beams are distributed on the two sides of the frame auxiliary beams and connected with all the vertical beams on the same side, and the second cross beams are arranged in the middle and connected with the two frame auxiliary beams and a vertical beam distributed between the two frame auxiliary beams. According to the bottom support structure, the contact area between the bottom support structure and the battery pack box body can be effectively increased, the stress is more uniform, the risk caused by stress concentration is reduced, the overall strength of the bottom support structure can be improved, and the service life of the bottom support structure is prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of battery support technology, specifically relating to a high-strength battery base structure. Background Technology

[0002] The battery system mainly consists of a battery bracket assembly, side frame assembly, upper frame assembly, battery pack, high-voltage box, BMS low-voltage control box, liquid cooling unit, exhaust can, liquid cooling management assembly, high-voltage power harness, low-voltage communication harness, and skin assembly fasteners. The battery base bracket assembly supports and secures the battery pack, preventing system performance failure and accidents caused by external excitation of the battery pack during vehicle operation. The side frame assembly connects the upper frame assembly and the bracket assembly, forming a frame structure that enhances overall rigidity. The side frame assembly is also designed to secure components such as wiring harnesses. The upper frame assembly supports and secures the high and low voltage boxes and liquid cooling unit, and also serves to secure the skin. The battery pack provides power to the vehicle, and the high-voltage box houses the battery. The battery pack's charging and discharging control and high-voltage insulation detection are handled by the BMS low-voltage control box, which provides communication for battery pack charging and discharging, voltage and temperature detection and control, and linkage with the vehicle controller. The liquid cooling unit cools or heats the battery pack when it is at high or low temperatures or when the cell temperature exceeds the system's set temperature threshold during operation, ensuring vehicle operation, extending battery pack lifespan, and reducing safety risks. The venting tank removes air from the system, ensuring smooth coolant circulation and guaranteeing the normal and efficient operation of the liquid cooling unit. The liquid cooling piping assembly conducts and dissipates heat from the battery pack; the hot and cold water flow dissipates heat generated within the battery pack, preventing overheating and impacting battery performance and lifespan. The high-voltage power harness connects the power battery pack, high-voltage box, and vehicle controller, transmitting electrical energy from the battery pack to the motor and motor controller to drive the vehicle. The low-voltage communication harness connects battery packs for low-voltage communication and links with the vehicle controller, handling signal transmission and response to ensure the normal operation of various electronic devices. The function of the skin assembly is to protect the entire battery system: 1) prevent external foreign objects from splashing onto the battery pack and causing damage; 2) also serve as insulation to prevent the vehicle from being directly exposed to cold air during driving, which could cause large temperature differences in the system and affect the overall vehicle driving experience; 3) provide some corrosion protection to prevent damage to the battery pack from external dust and chemically corrosive substances; the function of the fasteners is to fix the skin and prevent it from detaching from the frame, thus preventing some damage.

[0003] As the operating conditions of new energy vehicles become increasingly stringent, the requirements for system reliability also become more stringent, primarily in terms of road conditions. Some applications involve transporting materials in mines, placing particularly high demands on the mechanical strength of the system frame. For example, the standard design requirements for passenger cars or commercial vehicles generally only need to meet the vibration conditions of the new national standard GB38031-2020 (Z-axis combined acceleration of only 0.73g, with a total test endurance duration of 36 hours). However, for special scenarios such as mines and coal mines, these requirements may not be met, necessitating higher strength requirements for the system frame. Generally, these requirements need to meet the mechanical strength requirements of the old national standard GB / T31467.3-2015 (Z-axis combined acceleration of 1.44g, with a total test endurance duration of 63 hours), effectively doubling the mechanical vibration intensity. The new national standard 38031-2020 cannot meet the actual working conditions. Long-term use under harsh working conditions may cause the system frame device structure to tear, battery system communication abnormalities, and certain property losses. Therefore, it is necessary to optimize and upgrade the entire system frame device structure to improve the overall safety, reliability and service life of the battery system, and also to give users more peace of mind. Utility Model Content

[0004] The purpose of this utility model is to provide a high-strength battery base structure that can effectively increase the contact area between the base structure and the battery pack housing, making the stress distribution more uniform, reducing the risk of stress concentration, and improving the overall strength of the base structure and extending its service life.

[0005] To achieve the above objectives, the present invention provides a high-strength battery base structure, including a sub-frame beam for connecting the main beam of the vehicle, wherein the sub-frame beams are arranged in parallel pairs, and a rectangular frame structure is connected above the sub-frame beams.

[0006] The rectangular frame structure includes a front mounting beam and a rear mounting beam arranged perpendicular to the subframe beam, and a left mounting beam and a right mounting beam arranged parallel to the subframe beam.

[0007] A connecting and fixing plate is attached to the top of the rectangular frame structure;

[0008] The interior of the rectangular frame structure contains several vertical beams that connect the front and rear installation beams;

[0009] The rectangular frame structure has a first crossbeam and a second crossbeam inside. The first crossbeam is distributed on both sides of the sub-frame beam and connects all the vertical beams on the same side. The second crossbeam is centrally located and connects the two sub-frame beams and the vertical beams distributed between the two sub-frame beams.

[0010] As a further embodiment of this utility model: a charging base fixing bracket is connected to the bottom of the left or right mounting beam, and a high and low voltage wiring harness fixing bracket is connected to the vertical beam. The charging base fixing bracket and the high and low voltage wiring harness fixing bracket are located on the same side of the vehicle frame sub-beam.

[0011] As a further embodiment of this utility model: the connecting fixing plate is provided with welding nuts, the connecting fixing plate includes a horizontal fixing plate and a vertical fixing plate, the horizontal fixing plate is symmetrically connected to the front mounting beam and the rear mounting beam, and the vertical fixing plate is symmetrically connected to the left mounting beam, the right mounting beam and several vertical plates; several skin brackets are connected to the upper outer side of the horizontal fixing plate.

[0012] As a further embodiment of this utility model: the transverse fixing plate is an L-shaped bent plate, and a first fixing plate reinforcing rib connecting the front mounting beam or the right mounting beam is provided below the transverse fixing plate, and a second fixing plate reinforcing rib simultaneously connecting the sub-beam of the frame, the front mounting beam or the right mounting beam is provided below the transverse fixing plate.

[0013] As a further embodiment of this utility model: the sub-beam of the frame is provided with mounting beam reinforcing ribs on both sides that are connected to the front mounting beam or the rear mounting beam.

[0014] As a further embodiment of this utility model: the outer side of the rectangular frame structure is provided with a U-shaped sub-beam reinforcing rib that connects the sub-beam of the frame, the front mounting beam or the rear mounting beam, and the mounting beam reinforcing rib; the inner side of the rectangular frame structure is provided with an L-shaped sub-beam reinforcing rib that connects the sub-beam of the frame, the front mounting beam or the rear mounting beam, and the mounting beam reinforcing rib.

[0015] As a further embodiment of this utility model: the reinforcing rib of the U-shaped sub-beam is provided with a circular weld seam facing the reinforcing rib of the second fixed plate, and the reinforcing rib of the L-shaped sub-beam is provided with a strip weld seam facing the front mounting beam or the rear mounting beam.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. Four rectangular tubes are welded together to form a rectangular frame structure. Combined with the connecting and fixing plate of the L-shaped bent plate structure, they are welded together to form a base support structure, which facilitates overall processing (milling the plane and drilling), ensures more precise flatness and dimensional accuracy of the assembly holes, improves overall assembly efficiency and reduces the strength risk caused by stress concentration areas.

[0018] 2. It can effectively increase the contact area between the base structure and the battery pack box, making the stress more even, reducing the risk of local stress deviation at the installation point, and improving the overall strength of the base structure and extending its service life.

[0019] 3. The second fixing plate reinforcing rib is welded to the sub-beam of the frame and the mounting beam as a whole, which can improve the overall rigidity of the second fixing plate reinforcing rib and ensure the weld strength between the mounting beam and the sub-beam of the frame;

[0020] 4. The design of U-shaped and L-shaped sub-beam reinforcing ribs can further strengthen the fixation, and the U-shaped and L-shaped sub-beam reinforcing ribs are respectively provided with circular welds and strip welds, which can increase the connection strength of the reinforcing ribs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the high-strength battery base structure of this utility model.

[0022] Figure 2 This is a schematic diagram of the bottom view of the high-strength battery support structure of this utility model.

[0023] Figure 3 This is a top view schematic diagram of the high-strength battery base structure of this utility model.

[0024] Figure 4 yes Figure 3 Schematic diagram of partial cross-sectional structure of the middle cc.

[0025] Figure 5 This is a partial structural schematic diagram of the high-strength battery base structure of this utility model.

[0026] Figure 6 This is a schematic diagram of the U-shaped secondary beam reinforcing rib of the high-strength battery base structure of this utility model.

[0027] Figure 7 This is a schematic diagram of the L-shaped secondary beam reinforcing rib of the high-strength battery base structure of this utility model.

[0028] In the diagram: 1. Subframe beam, 2. Second fixing plate reinforcing rib, 3. Mounting beam reinforcing rib, 4. Front mounting beam, 5. Right mounting beam, 6. Rear mounting beam, 7. Skin bracket, 8. Vertical beam, 9. First crossbeam, 10. Second crossbeam, 11. Connecting fixing plate, 12. Left mounting beam, 13. Charging base fixing bracket, 14. High and low voltage wiring harness fixing bracket, 15. First fixing plate reinforcing rib, 16. U-shaped subframe reinforcing rib, 17. L-shaped subframe reinforcing rib, 18. Welded nut, 19. Circular weld seam, 20. Strip weld seam. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings.

[0030] like Figure 1 As shown, the high-strength battery base structure includes a sub-frame beam 1 for connecting to the vehicle's main beam. The sub-frame beams 1 are arranged in parallel pairs, and a rectangular frame structure is connected above the sub-frame beams 1. This rectangular frame structure improves overall rigidity.

[0031] The rectangular frame structure includes a front mounting beam 4 and a rear mounting beam 6 arranged perpendicular to the sub-beam 1 of the frame, and a left mounting beam 12 and a right mounting beam 5 arranged parallel to the sub-beam 1 of the frame; the front mounting beam 4 and the rear mounting beam 6, as well as the left mounting beam 12 and the right mounting beam 5, are all rectangular tubes, which are welded together to form the rectangular frame structure.

[0032] A connecting and fixing plate 11 is connected to the top of the rectangular frame structure;

[0033] The interior of the rectangular frame structure contains several vertical beams 8 that connect the front mounting beams 4 and the rear mounting beams 6.

[0034] The rectangular frame structure has a first crossbeam 9 and a second crossbeam 10 inside. The first crossbeam 9 is distributed on both sides of the sub-frame beam 1 and connects all the vertical beams 8 on the same side. The second crossbeam 10 is centrally located and connects the two sub-frame beams 1 and the vertical beams 8 distributed between the two sub-frame beams 1.

[0035] To facilitate securing the charging dock and high / low voltage wiring harnesses, further, such as Figure 2 As shown, a charging base mounting bracket 13 is connected to the bottom of the left mounting beam 12 or the right mounting beam 5, and a high and low voltage wiring harness mounting bracket 14 is connected to the vertical beam 8. The charging base mounting bracket 13 and the high and low voltage wiring harness mounting bracket 14 are located on the same side of the vehicle frame sub-beam 1.

[0036] Furthermore, such as Figure 1 , Figure 3 and Figure 4 As shown, the connecting fixing plate 11 is equipped with welding nuts 18, and the connecting fixing plate 11 is symmetrically connected to the front mounting beam 4 and the rear mounting beam 6; several skin brackets 7 are connected to the upper outer side of the connecting fixing plate 11. The connecting fixing plate 11 is used to support and fix the battery pack, the welding nuts 18 are used to connect and fix the battery pack, and the skin brackets 7 are used to connect and fix the skin, which is safe and reliable.

[0037] To further improve the overall rigidity of the base structure, such as... Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the connecting fixing plate 11 is an L-shaped bent plate. Below the connecting fixing plate 11, there is a first fixing plate reinforcing rib 15 that connects to the front mounting beam 4 or the right mounting beam 5. Below the connecting fixing plate 11, there is a second fixing plate reinforcing rib 2 that simultaneously connects to the frame sub-beam 1, the front mounting beam 4, or the right mounting beam 5. The second fixing plate reinforcing rib 2 is made of rectangular tube. The rear end of the rectangular tube is sealed and welded together with a plate of different thickness. The front end is designed with a certain angle structure and is also sealed and welded with a plate of the same thickness. Then, it is welded together with the frame sub-beam 1 and the front mounting beam 4 or the rear mounting beam 6. This can improve the overall rigidity of the second fixing plate reinforcing rib 2 and ensure the weld strength of the frame sub-beam 1 and the front mounting beam 4 or the rear mounting beam 6.

[0038] Furthermore, the subframe beam 1 is provided with mounting beam reinforcing ribs 3 on both sides, which are connected to the front mounting beam 4 or the rear mounting beam 6.

[0039] Furthermore, the outer side of the rectangular frame structure is provided with a U-shaped sub-beam reinforcing rib 16 that connects the sub-beam 1 of the frame, the front mounting beam 4 or the rear mounting beam 6, and the mounting beam reinforcing rib 3, while the inner side of the rectangular frame structure is provided with an L-shaped sub-beam reinforcing rib 17 that connects the sub-beam 1 of the frame, the front mounting beam 4 or the rear mounting beam 6, and the mounting beam reinforcing rib 3.

[0040] Furthermore, such as Figures 4 to 7 As shown, the U-shaped sub-beam reinforcing rib 16 has a circular weld 19 facing the second fixed plate reinforcing rib 2, and the L-shaped sub-beam reinforcing rib 17 has a strip weld 20 facing the front mounting beam 4 or the rear mounting beam 6.

[0041] High-strength battery base structure design principle: The connection between the base structure and the battery pack adopts a bending large flat plate structure connection fixing plate 11, which can increase the contact area between the battery pack and the base structure and reduce the risk of local stress deviation at the installation point;

[0042] From the perspective of mechanical simulation trends, the maximum stress point of the base structure is at the connection position between the sub-beam 1 of the frame and the front mounting beam 4 and the rear mounting beam 6. Therefore, the structure at this point was designed to be strengthened and optimized. U-shaped sub-beam reinforcing ribs 16 and L-shaped sub-beam reinforcing ribs 17 were added to the connection area between the sub-beam 1 of the frame and the front mounting beam 4 and the rear mounting beam 6, respectively. The sub-beam 1 of the frame and the front mounting beam 4 and the rear mounting beam 6 were layered and fixed to improve the strength of the stress area. In addition, plug welds were added locally (circular plug welds 19 on the U-shaped sub-beam reinforcing rib 16 and strip plug welds 20 on the L-shaped sub-beam reinforcing rib 17) to avoid insufficient strength of local welds and to increase the reinforcement effect.

Claims

1. A high-strength battery base structure, including a sub-beam (1) for connecting the main beam of the vehicle, characterized in that, The subframe beams (1) are arranged in parallel pairs, and a rectangular frame structure is connected above the subframe beams (1); The rectangular frame structure includes a front mounting beam (4) and a rear mounting beam (6) arranged perpendicular to the sub-beam (1) of the frame, and a left mounting beam (12) and a right mounting beam (5) arranged parallel to the sub-beam (1) of the frame; A connecting and fixing plate (11) is connected to the top of the rectangular frame structure; The interior of the rectangular frame structure is located on vertical beams (8) that connect the front installation beams (4) and the rear installation beams (6); The rectangular frame structure has a first crossbeam (9) and a second crossbeam (10). The first crossbeam (9) is distributed on both sides of the sub-beam (1) of the frame and connects all the vertical beams (8) on the same side. The second crossbeam (10) is centrally located and connects the two sub-beams (1) of the frame and the vertical beams (8) distributed between the two sub-beams (1).

2. The high-strength battery base structure according to claim 1, characterized in that, The bottom of the left mounting beam (12) or the right mounting beam (5) is connected to a charging base bracket (13), and the vertical beam (8) is connected to a high and low voltage wiring harness fixing bracket (14). The charging base bracket (13) and the high and low voltage wiring harness fixing bracket (14) are located on the same side of the vehicle frame sub-beam (1).

3. The high-strength battery base structure according to claim 1 or 2, characterized in that, The connecting fixing plate (11) is provided with welding nuts (18), and the connecting fixing plate (11) is symmetrically connected to the front mounting beam (4) and the rear mounting beam (6); several skin brackets (7) are connected to the outer side above the connecting fixing plate (11).

4. The high-strength battery base structure according to claim 3, characterized in that, The connecting fixing plate (11) is an L-shaped bent plate. The connecting fixing plate (11) is provided with a first fixing plate reinforcing rib (15) for connecting the front mounting beam (4) or the right mounting beam (5) below the connecting fixing plate (11). The connecting fixing plate (11) is provided with a second fixing plate reinforcing rib (2) for simultaneously connecting the sub-beam of the frame (1), the front mounting beam (4) or the right mounting beam (5) below the connecting fixing plate (11).

5. The high-strength battery base structure according to claim 4, characterized in that, The sub-beam (1) of the frame is provided with mounting beam reinforcing ribs (3) on both sides, which are connected to the front mounting beam (4) or the rear mounting beam (6).

6. The high-strength battery base structure according to claim 5, characterized in that, The outer side of the rectangular frame structure is provided with a U-shaped sub-beam reinforcing rib (16) that connects the sub-beam of the frame (1), the front mounting beam (4) or the rear mounting beam (6) and the mounting beam reinforcing rib (3). The inner side of the rectangular frame structure is provided with an L-shaped sub-beam reinforcing rib (17) that connects the sub-beam of the frame (1), the front mounting beam (4) or the rear mounting beam (6) and the mounting beam reinforcing rib (3).

7. The high-strength battery base structure according to claim 6, characterized in that, The U-shaped sub-beam reinforcing rib (16) has a circular weld (19) facing the second fixed plate reinforcing rib (2), and the L-shaped sub-beam reinforcing rib (17) has a strip weld (20) facing the front mounting beam (4) or the rear mounting beam (6).

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