New energy automobile power battery pack reinforcing beam

Abstract

The utility model belongs to new energy automobile battery technical field belongs to, disclose new energy automobile power battery package reinforcing beam, including square frame cover, square frame cover is by a plurality of upper beams, a plurality of lower beams, a plurality of left beams, a plurality of right beams the frame structure of composition;Upper beam installs on battery package upper cover top;Lower beam installs in battery package tray below;Left beam and right beam and fixed mounting on battery package shell, battery package tray;In square frame cover bottom surface setting a plurality of mutually connected W shape's liquid cooling pipeline no.

Description

Technical Field

[0001] This utility model belongs to the field of new energy vehicle battery technology, specifically a reinforcing beam for a new energy vehicle power battery pack. Background Technology

[0002] With the rapid development of electric vehicles, battery technology is also constantly innovating. Current electric vehicle battery packs use CTP (Cell-to-Pack) battery technology, which eliminates the intermediate module assembly step. The cells are tightly arranged inside the battery pack casing, allowing for a more direct connection between the cells and the casing. Battery packs are typically assembled with reinforcing beams, but this presents challenges in battery thermal management, resulting in poor heat dissipation performance.

[0003] Reference CN207997759U discloses an electric vehicle battery pack mounting bracket, including a battery pack mounting plate with through holes. Fixing components are installed on the bottom of the mounting plate corresponding to the through holes. Reinforcing plates are installed at both ends of the mounting plate, and plug welding holes are provided on the side plates of the mounting plate. The fixing components and through holes provide mounting points for the battery pack. However, this method does not effectively dissipate heat from the battery pack. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a reinforcing beam for a new energy vehicle power battery pack that improves battery thermal management capabilities and overall heat dissipation performance.

[0005] To address the above technical issues, this utility model provides a reinforcing beam for a power battery pack in new energy vehicles, comprising a square frame, which is a frame structure composed of several upper beams, several lower beams, several left beams, and several right beams; the upper beams are installed above the battery pack cover; the lower beams are installed below the battery pack tray; the left and right beams are fixedly installed on the battery pack shell and the battery pack tray; several interconnected W-shaped liquid cooling pipes are provided on the bottom surface of the square frame, which are fitted to the battery pack cover; several interconnected W-shaped liquid cooling pipes are provided on the top surface of the square frame, which are fitted to the battery tray; a circulation pump is installed at the inlet of the liquid cooling pipes, the liquid cooling pipes are connected to the liquid cooling pipes, and the outlet of the liquid cooling pipes is connected to an external circulating water tank; an air guide cavity is installed on the square frame, and a cooling fan is installed on the air guide cavity.

[0006] By adopting the above technical solution, W-shaped liquid cooling pipes one and two are installed inside the reinforcing beam on the battery pack to improve the battery's thermal management capability. The air duct layout is optimized through the air guide cavity, so that the airflow generated by the cooling fan can more efficiently cover the end face of the battery module and the surface of the liquid cooling pipe, thereby improving the overall heat dissipation performance.

[0007] The preferred heat dissipation capacity of a single W-shaped liquid cooling pipe is: Q 单管 =h*A*ΔTlm ；

[0008] Where h: convective heat transfer coefficient; A: contact area between the W-shaped liquid cooling pipe and the battery pack; ΔT lm Logarithmic mean temperature difference.

[0009] By adopting the above technical solution, the required number of W-shaped liquid cooling pipes can be easily determined by calculating the heat dissipation capacity of a single W-shaped liquid cooling pipe.

[0010] Preferably, the number of W-shaped liquid cooling pipes is: N = Q total / (Q single pipe * η).

[0011] Where Qtotal is the total heat generation power of the battery pack, and η is the safety factor.

[0012] By adopting the above technical solution, the optimal cooling effect can be achieved by using the most suitable number of W-shaped liquid cooling pipes on a pair of battery covers, thereby improving heat dissipation efficiency.

[0013] Preferably, the number of W-shaped liquid cooling pipes II is the same as the structure and number of W-shaped liquid cooling pipes I.

[0014] By adopting the above technical solution, the identical structure and quantity of the W-shaped liquid cooling pipes (second and first) ensure a symmetrical distribution of heat dissipation power, avoiding localized overheating or overcooling. Scientifically configuring the number of W-shaped liquid cooling pipes significantly improves the thermal management performance of the battery pack, extends battery life, and enhances safety.

[0015] Preferably, the air guide cavity includes an upper cavity and a lower cavity, with the outlet end of the upper cavity facing the W-shaped liquid cooling pipe one and the outlet end of the lower cavity facing the W-shaped liquid cooling pipe two.

[0016] By adopting the above technical solution, the upper and lower chambers can independently control the airflow direction, so that the air volume can directly act on the surface of the corresponding W-shaped liquid cooling pipe, reducing the ineffective diffusion of airflow.

[0017] Preferably, both the upper and lower cavities are trapezoidally tapered, with narrow outlets, and the sidewalls of both the upper and lower cavities are tapered in a straight line or an arc.

[0018] By adopting the above technical solution, the air-guiding cavity is reduced, forming a Venturi effect to accelerate airflow and improve heat dissipation efficiency.

[0019] Preferably, the inlet ends of the upper and lower chambers are close together and a hot air fan is installed together, with the cooling fan installed on the outer wall of the air guide cavity.

[0020] By adopting the above technical solution, the upper and lower chambers can independently control the airflow direction while sharing a single cooling fan, simplifying the fan installation structure and reducing the amount of seals and fasteners used.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. This utility model employs W-shaped liquid cooling pipes one and two, installed inside the reinforcing beam and on the battery pack, to enhance battery thermal management capabilities. By optimizing the airflow layout through the air guide cavity, the airflow generated by the cooling fan more efficiently covers the end face of the battery module and the surface of the liquid cooling pipes, improving overall heat dissipation performance.

[0023] 2. The W-shaped pipe of this utility model increases the pipe length in the same space through multiple folding designs, thereby increasing the contact area with the battery surface. The W-shaped pipe avoids local overheating through uniform heat dissipation, improving the stability of the battery system. Under the same heat dissipation requirements, the volume of the W-shaped pipe is reduced by 20%-30% compared with the traditional serpentine pipe, improving space utilization.

[0024] 3. The air-guiding cavity of this utility model gradually narrows, forming a Venturi effect to accelerate airflow and improve heat dissipation efficiency. Attached Figure Description

[0025] Figure 1 This is a perspective view of the present utility model;

[0026] Figure 2 This is a schematic diagram of the liquid cooling pipeline installed at the bottom of this utility model;

[0027] Figure 3 This is a schematic diagram of the liquid cooling pipeline of this utility model;

[0028] Figure 4 This is a cross-sectional view of the air guide cavity of this utility model.

[0029] Drawing numbers: 1. Frame sleeve, 2. Upper beam, 3. Lower beam, 4. Left beam, 5. Right beam, 6. Battery pack cover, 7. Battery pack tray, 8. Liquid cooling line one, 9. Liquid cooling line two, 10. Circulation pump, 11. Air guide cavity, 12. Cooling fan, 13. Upper cavity, 14. Lower cavity, 15. Battery pack housing. Detailed Implementation

[0030] like Figure 1 As shown, the reinforcing beam of the power battery pack for new energy vehicles includes a square frame 1, which is a frame structure composed of several upper beams 2, several lower beams 3, several left beams 4, and several right beams 5. The frame structure is used to strengthen the battery pack, ensuring structural strength while facilitating heat dissipation of the battery pack casing (15). The upper beams 2 are installed above the battery pack cover 6 and connected to the bottom surface of the vehicle floor. Figure 2As shown, the lower beam 3 is installed below the battery pack tray 7. The left beam 4 and right beam 5 are fixedly connected to the battery pack housing 15 and the battery pack tray 7 by bolts. Several W-shaped series-connected liquid cooling pipes 8 are arranged on the bottom surface of the square frame sleeve 1, and the liquid cooling pipes 8 are attached to the battery pack top cover 6; several W-shaped series-connected liquid cooling pipes 9 are arranged on the top surface of the square frame sleeve 1, and the liquid cooling pipes 9 are attached to the battery tray 7. Figure 3 As shown, a circulation pump 10 is installed at the inlet of liquid cooling pipe 8, and the circulation pump 10 is mounted on a bracket inside the engine compartment of the vehicle. Liquid cooling pipe 8 and liquid cooling pipe 9 are connected, and the outlet of liquid cooling pipe 9 is connected to an external circulating water tank; an air guide cavity 11 is installed on the square sleeve 1, and a cooling fan 12 is installed on the air guide cavity 11.

[0031] The heat dissipation capacity of a single W-shaped liquid cooling pipe (Q) is: 单管 =h*A*ΔT lm Where h: convective heat transfer coefficient (W / m²·K), A: contact area between a single W-shaped pipe and the battery pack (m²); ΔT lm Logarithmic mean temperature difference (K, temperature difference between coolant and battery surface). By calculating the heat dissipation capacity of a single W-shaped liquid cooling pipe, the required number of W-shaped liquid cooling pipes can be easily determined.

[0032] The number of W-shaped liquid cooling pipes 8 is: N = Q_total / (Q_single pipe * η); where Q_total: total heat generation power of the battery pack (W), and η: safety factor, typically taken as 1.2-1.5. Using the optimal number of W-shaped liquid cooling pipes 8 achieves the best cooling effect on the battery cover, improving heat dissipation efficiency.

[0033] The number of W-shaped liquid cooling lines 29 is the same as the structure and number of W-shaped liquid cooling lines 18. The identical structure and number of W-shaped liquid cooling lines 29 and 18 ensure symmetrical distribution of heat dissipation power, avoiding localized overheating or overcooling. By scientifically configuring the number of W-shaped liquid cooling lines, the thermal management performance of the battery pack is significantly improved, extending battery life and enhancing safety.

[0034] This application employs W-shaped liquid cooling pipes 8 and 9 installed inside the reinforcing beam and on the battery pack to enhance battery thermal management capabilities. The optimized airflow layout via the air guide cavity 11 allows the airflow generated by the cooling fan 12 to more efficiently cover the battery module end face and the surface of the liquid cooling pipes, improving overall heat dissipation performance. The W-shaped pipes, through multiple folding designs, increase pipe length within the same space, increasing the contact area with the battery surface. The W-shaped pipes prevent localized overheating through uniform heat dissipation, improving battery system stability. Under the same heat dissipation requirements, the volume of the W-shaped pipes is reduced by 20%-30% compared to traditional serpentine pipes, improving space utilization.

[0035] like Figure 4As shown, the air guide cavity 11 includes an upper cavity 13 and a lower cavity 14. The outlet end of the upper cavity 13 faces the W-shaped liquid cooling pipe 8, and the outlet end of the lower cavity 14 faces the W-shaped liquid cooling pipe 9. The upper cavity 13 and the lower cavity 14 independently control the airflow direction, so that the air volume directly acts on the surface of the corresponding W-shaped liquid cooling pipe, reducing ineffective airflow diffusion.

[0036] Both the upper cavity 13 and the lower cavity 14 are trapezoidal and tapering, with narrow outlets. The sidewalls of both the upper cavity 13 and the lower cavity 14 taper in a straight line or an arc. The tapering shape of the upper cavity 13 and the lower cavity 14 creates a Venturi effect, accelerating airflow and improving heat dissipation efficiency.

[0037] The inlet ends of the upper cavity 13 and the lower cavity 14 are close together and share a common hot air fan 12, which is installed on the outer wall of the air guide cavity 11. While the upper cavity 13 and the lower cavity 14 independently control the airflow direction, they share a common hot air fan 12, which simplifies the fan installation structure and reduces the amount of seals and fasteners used.

[0038] During operation, the circulation pump 10 is started to inject cooling water into the liquid cooling pipes 8 and 9 to dissipate heat from the battery pack. The cooling fan 12 is turned on, blowing air into the upper chamber 13 and lower chamber 14 to efficiently dissipate heat from the upper and lower ends of the battery pack, and to enhance the heat dissipation effect of the liquid cooling pipes 8 and 9. This application not only strengthens the protection of the battery pack and liquid cooling pipe structure, but also improves the heat dissipation effect of the battery pack.

[0039] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A reinforcing beam for a power battery pack in a new energy vehicle, characterized in that: Includes a square frame (1), which is a frame structure composed of several upper beams (2), several lower beams (3), several left beams (4), and several right beams (5); the upper beams (2) are installed above the battery pack cover (6); the lower beams (3) are installed below the battery pack tray (7); the left beams (4) and right beams (5) are fixedly installed on the battery pack housing (15) and the battery pack tray (7); several interconnected W-shaped liquid cooling pipes (8) are provided on the bottom surface of the square frame (1), the liquid cooling pipes The first (8) is attached to the top cover (6) of the battery pack; several interconnected W-shaped liquid cooling pipes (9) are set on the top surface of the square sleeve (1), and the liquid cooling pipes (9) are attached to the battery pack tray (7); a circulation pump (10) is installed at the inlet of the first liquid cooling pipe (8), the first liquid cooling pipe (8) and the second liquid cooling pipe (9) are connected, and the outlet of the second liquid cooling pipe (9) is connected to the external circulating water tank; an air guide cavity (11) is installed on the square sleeve (1), and a cooling fan (12) is installed on the air guide cavity (11).

2. The reinforcing beam for a new energy vehicle power battery pack according to claim 1, characterized in that: The heat dissipation capacity of a single W-shaped liquid cooling pipe (8): Q 单管 =h*A*ΔT lm ； Where h: convective heat transfer coefficient, A: contact area between a single W-shaped liquid cooling pipe (8) and the battery pack; ΔT lm Logarithmic mean temperature difference.

3. The reinforcing beam for a new energy vehicle power battery pack according to claim 2, characterized in that: The number of liquid cooling pipes (8) is: N = Q total / (Q single pipe * η); in, Q_total: Total heat generation power of the battery pack; η: Safety factor.

4. The reinforcing beam for a new energy vehicle power battery pack according to claim 1, characterized in that: The number of liquid cooling pipes two (9) is the same as the structure and number of liquid cooling pipes one (8).

5. The reinforcing beam for a new energy vehicle power battery pack according to claim 1, characterized in that: The air guide cavity (11) includes an upper cavity (13) and a lower cavity (14). The outlet end of the upper cavity (13) faces the W-shaped liquid cooling pipe one (8), and the outlet end of the lower cavity (14) faces the W-shaped liquid cooling pipe two (9).

6. The reinforcing beam for a new energy vehicle power battery pack according to claim 5, characterized in that: The upper cavity (13) and the lower cavity (14) are both trapezoidal and tapering, with narrow outlets. The sidewalls of the upper cavity (13) and the lower cavity (14) are both tapering in a straight line or arc.

7. The reinforcing beam for a new energy vehicle power battery pack according to claim 6, characterized in that: The inlet ends of the upper cavity (13) and the lower cavity (14) are close together and a heat fan (12) is installed together. The heat dissipation fan (12) is installed on the outer wall of the air guide cavity (11).

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