Movable nut for mounting battery pack

Abstract

The utility model relates to the technical field of battery pack installation, and discloses a movable nut for battery pack installation, which comprises a nut core and a main shell, threads are arranged in the nut core, and the nut core comprises a nut core main body and a nut core bottom; the main shell comprises a rectangular main plate with a through hole in the center, four side edges of the main plate are provided with protruding parts, and the four protruding parts extend and bend towards the same side of the main plate; the four protruding parts are divided into two first protruding parts and two second protruding parts according to opposite positions; a plurality of convex welding spots are arranged at one end of the second protruding part away from the through hole; the sectional area of the through hole is larger than that of the nut core body and smaller than that of the nut core bottom. The nut core is higher than the main shell. On the basis of meeting the assembly strength requirement, the movable nut is simple in structure, compact, small and exquisite, rich in adjustable angle, capable of being assembled at a time, welded in a projection welding mode and convenient and efficient to install, the projection welding point can be flexibly adjusted according to the actual assembly scene, and the movable nut can adapt to complex installation scenes of various vehicle types and different battery packs.

Description

Technical Field

[0001] This utility model relates to the field of battery pack installation technology, and specifically to a movable nut for battery pack installation. Background Technology

[0002] The use of adjustable nuts for battery pack mounting significantly improves the flexibility and safety of the vehicle structure. In vehicle design, these nuts allow for fine-tuning of the battery pack in three dimensions, ensuring precise and stable installation and effectively addressing tolerance issues in vehicle body manufacturing.

[0003] However, the commonly used movable nuts have the following structural problems: to meet welding strength and allow for a large adjustment range, the overall structure is large, making them unsuitable for placement on irregularly shaped mother parts; the connection method with the mother part is complex, requiring robotic welding, which is costly; the shell structure providing the movable adjustment of the nut position is unreasonable, for example, one end is closed and the other end is open, resulting in an asymmetrical structure that is prone to deformation after welding; and although it allows for flexible assembly of the nut, it requires an additional silicone washer to fix the nut after position adjustment. During use, this additional silicone washer is not heat-resistant and sticks to the whole vehicle after electrophoresis, making it inflexible and prone to damage, requiring replacement after only two uses, resulting in high maintenance costs; and during actual assembly, secondary assembly is required, making installation complex. Utility Model Content

[0004] The present invention aims to provide a movable nut for battery pack installation, in order to solve the technical problem of unreasonable structure of existing movable nuts.

[0005] The basic solution provided by this utility model is: a movable nut for battery pack installation, including a nut core and a main housing;

[0006] The nut core has internal threads and includes the nut core body and the nut core bottom;

[0007] The main housing includes a rectangular main board with a through hole in the center, and each of the four sides of the main board has a protrusion. The four protrusions extend and bend toward the same side of the main board. The four protrusions are divided into two first protrusions and two second protrusions in relative positions. The end of the second protrusion away from the through hole is provided with several solder points.

[0008] The cross-sectional area of ​​the through hole is larger than the cross-sectional area of ​​the nut core body, but smaller than the cross-sectional area of ​​the bottom of the nut core;

[0009] The height of the nut core is greater than the height of the main housing.

[0010] The working principle and advantages of this utility model are as follows: the nut core and the main housing are two separate parts, which are assembled together after being welded to the base material by projection welding. Based on the design of the difference in cross-sectional area between the through hole and the nut, during assembly, the nut core body passes through the through hole from the space formed by the four protrusions. Using multiple projection welding points on the two second protrusions of the main housing, the main housing is projection welded to the base material. The bottom of the nut core is confined within the space formed by the four protrusions and the base material. Based on the height design, the top surface of the nut core is always kept above the through hole, thereby realizing the effective assembly of the nut, the main housing, and the base material. Based on the reasonable design of the difference in cross-sectional area and the extension length of the protrusions, the position of the nut core can be flexibly adjusted to accurately align the battery pack fixing bolts. The bolts pass through the nut core and the base material to complete the installation.

[0011] Compared to existing technologies, this solution features a through-hole-free movable nut with four protrusions forming a space for nut positioning, eliminating the need for additional nut fixing components and resulting in a simpler and more compact overall structure. Furthermore, it can be formed in one stamping process, resulting in a symmetrical structure that significantly reduces manufacturing costs while ensuring sufficient strength for conventional battery pack installations across various dimensional configurations. During use, the structure experiences balanced stress, maintaining consistent strength. This optimized movable nut design is compact and offers a wide range of adjustable angles, adapting to various vehicle models and complex battery pack installation locations, easily handling confined spaces and uniquely shaped installation points. Moreover, this solution enables one-time assembly, and the projection welding method greatly simplifies the installation process, improving efficiency and convenience. The position of the projection weld points can be flexibly adjusted according to the actual assembly scenario, ensuring optimal performance at each connection point and further enhancing system stability and reliability.

[0012] The optimized structure is more simplified in terms of dimensional relationships. This not only accelerates the dimensional design process but also allows for rapid response to the movement requirements of the nut core in the X, Y, and Z directions in different application scenarios, thus quickly completing dimensional adjustments and achieving a high degree of adaptability and flexibility. This approach is particularly important for applications where vehicle models, battery packs, and installation locations are constantly changing.

[0013] This solution not only improves the overall performance of the movable nut, but also provides a more efficient, reliable, and flexible solution for securing battery packs in electric vehicles and other related fields. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a movable nut for battery pack installation provided in an embodiment of the present utility model;

[0015] Figure 2 A front view of a movable nut for battery pack mounting provided in an embodiment of this utility model;

[0016] Figure 3 Left view of a movable nut for battery pack mounting provided in an embodiment of this utility model;

[0017] Figure 4 A top view of a movable nut for battery pack mounting provided in an embodiment of this utility model;

[0018] Figure 5 A top view of a movable nut for battery pack mounting provided in an embodiment of this utility model;

[0019] The markings in the accompanying drawings include: nut core 1, nut core body 11, nut core bottom 12, main housing 2, through hole 21, first protrusion 22, second protrusion 23, and solder joint 231. Detailed Implementation

[0020] The following detailed explanation illustrates the specific implementation methods:

[0021] The basic implementation examples are as follows: Figure 1 As shown: A movable nut for battery pack installation includes a nut core 1 and a main housing 2.

[0022] Nut core 1, with internal threads, includes nut core body 11 and nut core bottom 12. Specifically, the appropriate model of nut core 1 is selected according to the battery pack installation requirements; the nut core body 11 has internal threads, and the thread specifications can be customized according to the assembly relationship.

[0023] like Figure 2 , Figure 3 and Figure 4 As shown, the main housing 2 includes a rectangular main board with a through hole 21 in the center, and the main board has protrusions on all four sides. The four protrusions extend and bend toward the same side of the main board. The four protrusions are divided into two first protrusions 22 and two second protrusions 23 in relative positions. The end of the second protrusion 23 away from the through hole 21 is provided with several solder points 231.

[0024] In this embodiment, the four protrusions are integrally formed with the rectangular main board before bending by stamping. This design can improve the precision and consistency of the main shell 2, reduce assembly processes, enhance structural strength, reduce production costs and material waste, and improve production efficiency.

[0025] The four protrusions have a bending angle of 90 degrees. This design enhances the structural rigidity and stability, provides a flat mating surface for projection welding, ensures welding strength and precision, improves overall assembly quality, ensures mating precision and stability, increases the risk of stress concentration, reduces structural strength, and may cause deformation or failure problems during long-term use.

[0026] During assembly, the nut core body 11 passes through the through hole from the space formed by the four protrusions, and the main housing 2 is welded to the base material. The bottom 12 of the nut core is confined within the space formed by the four protrusions and the base material. The nut core body 11 moves through the through hole 21, and the top surface of the nut core 1 always remains above the through hole 21.

[0027] Specifically, such as Figure 4 and Figure 5 As shown, the cross-sectional area of ​​the through hole 21 is larger than the cross-sectional area of ​​the nut core body 11, but smaller than the cross-sectional area of ​​the nut core bottom 12, so that the nut core bottom 12 is confined below the through hole 21, and the nut core body 11 can move through the through hole 21. The area difference between the cross-sectional area of ​​the through hole 21 and the cross-sectional area of ​​the nut core body 11 determines the left-right and front-back (X, Z directions) movement of the nut core 1. The area difference meets the preset movement requirement of the nut core center point position. In this embodiment, the area difference between the cross-sectional area of ​​the through hole 21 and the cross-sectional area of ​​the nut core body 11 meets the movement requirement of ±3mm for the nut core center point position. The diameter of the through hole 21 is customized according to the preset movement requirement, based on the fact that it is 1mm larger than the nut core diameter. For example, if the movement is ±3mm, then the diameter of the through hole 21 is the nut diameter + 1mm + 6mm. In other embodiments, the area difference can be flexibly adjusted according to the size of the nut core 1 and the left-right and front-back (X, Z directions) movement requirements of the nut core 1.

[0028] like Figure 3 As shown, the height h3 of the nut core 1 is greater than the height h4 of the main housing 2, ensuring that the top surface of the nut core 1 remains above the through hole 21, thus achieving effective assembly of the nut core 1 and the main housing 2. The specific height and difference are selected for compatibility using a nut structure based on assembly requirements. Furthermore, the clearance between the bottom of the nut core 1 and the main housing 2 (i.e., the extension length of the four protrusions and the height of the bottom 12 of the nut core) determines the vertical (Y-direction) movement of the nut core 1, which must meet the preset verticality requirement of the nut core 1, for example... Figure 3 The dashed line represents the adjusted nut core 1. A reasonable clearance (i.e., the maximum extension length of the four protrusions and the height of the bottom of the nut core) is selected to achieve a perpendicularity of nut core 1 of ±5°. Figure 3 (a) Inclination amount. In other embodiments, the extension length of the four protrusions and the height of the bottom 12 of the nut core can be flexibly adjusted according to the vertical (Y-direction) movement requirements of the nut core 1.

[0029] like Figure 2As shown, the length h1 of the first protrusion 22 is less than the length h2 of the second protrusion 23; furthermore, the difference between the length h1 of the first protrusion 22 and the length h2 of the second protrusion 23 is less than the height of the bottom 12 of the nut core; this design satisfies the requirement to limit the nut core 1 from moving out front and back, while also saving materials and reducing costs. h2 is generally half of h1, and the specific extension length and difference are selected for adaptability based on the assembly requirements using the nut core structure and the amount of movement.

[0030] like Figure 1 As shown, two weld points 231 are provided, located on both sides of the end of the second protrusion 23. This design ensures that the position and number of weld points 231 are reasonable, facilitating efficient and convenient weld projection welding while meeting welding strength requirements. The weld points 231 have inclined surfaces. This design, by using chamfers to reduce the size of the weld points 231, makes the size of the weld points 231 compatible with the overall size of the main housing 2, ensuring welding quality, welding efficiency, and structural safety. It avoids problems such as material waste, excessive heat input, stress concentration, short fatigue life, and welding defect risks caused by excessively large weld points 231.

[0031] The rectangular main body of the main housing 2 has a side length difference of 0-10mm and a side length of 35-45mm. It can be provided in sizes such as 40*40mm and 35*50mm, offering a compact design suitable for complex mounting surfaces in battery pack installation scenarios and expanding the application scenarios of the movable nut in this solution. With a reasonable thickness of the main body plate (2-3mm), using DC51 or conventional materials, combined with the dimensions of the main board and protrusions, and the design of the solder joint 231, the assembly strength requirements are met.

[0032] In practical use, the nut core body 11 passes through the through hole 21 from the space formed by the four protrusions. The main housing 2 is then projected onto the base material using multiple projection weld points 231 on the two second protrusions 23 of the main housing 2. The bottom 12 of the nut core is confined within the space formed by the four protrusions and the base material. The height h3 of the nut core 1 is greater than the height h4 of the main housing 2, so that the top surface of the nut core 1 is always kept above the through hole 21, thus achieving effective assembly of the nut core 1 and the main housing 2. The position of the nut core 1 is adjusted to precisely align the battery pack fixing bolts. The bolts pass through the nut core 1 and the base material to complete the installation.

[0033] This embodiment provides a fully optimized movable nut for battery pack installation, resulting in a simpler and more compact overall structure. This significantly reduces manufacturing costs while ensuring that it meets the strength requirements for conventional battery pack installation under various dimensional fits. This optimized movable nut design is small and flexible, offering a wide range of adjustable angles to adapt to various vehicle models and complex battery pack installation positions, easily handling both confined spaces and uniquely shaped installation points. Furthermore, this solution employs a one-time assembly combined with projection welding, greatly simplifying the installation process and improving assembly efficiency and convenience. The position of the projection weld points can be flexibly adjusted according to the actual assembly scenario, ensuring optimal performance at each connection point and further enhancing the system's stability and reliability.

[0034] The optimized structure is more simplified in terms of dimensional relationships, which not only accelerates the dimensional design process but also allows for rapid response to the movement requirements of the nut core in the X, Y, and Z directions in different application scenarios, achieving a high degree of adaptability and flexibility. This approach is particularly important for applications where vehicle models, battery packs, and installation locations are constantly changing.

[0035] This solution not only improves the overall performance of the movable nut, but also provides a more efficient, reliable, and flexible solution for securing battery packs in electric vehicles and other related fields.

[0036] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent.

Claims

1. A battery pack installation movable nut characterized by, The nut core and the main shell are included; The nut core is internally provided with threads, and includes a nut core main body and a nut core bottom; The main shell includes a rectangular main plate with a through hole in the center, and the four sides of the main plate each have a protruding part, and the four protruding parts extend and bend to the same side of the main plate; the four protruding parts are oppositely positioned into two first protruding parts and two second protruding parts; the end of the second protruding part away from the through hole is provided with a plurality of projection welding points; The cross-sectional area of the through hole is greater than the cross-sectional area of the nut core main body and smaller than the cross-sectional area of the nut core bottom; The height of the nut core is greater than the height of the main shell.

2. The movable nut for battery pack installation according to claim 1, wherein The length of the first protruding part is smaller than the length of the second protruding part.

3. The movable nut for battery pack installation according to claim 2, characterized by, The difference between the extension lengths of the first protruding part and the second protruding part is smaller than the height of the nut core bottom.

4. The mobile nut for battery pack installation according to claim 1, wherein The projection welding points are provided with two, respectively located on both sides of the end of the second protruding part.

5. The mobile nut for battery pack installation according to claim 1, wherein The projection welding points have inclined surfaces.

6. The mobile nut for battery pack installation according to claim 1, wherein The four protruding parts are integrally formed with the rectangular main plate before bending.

7. The mobile nut for battery pack installation according to claim 1, wherein The bending angle of the four protruding parts is 90 degrees.

8. The mobile nut for battery pack installation according to claim 1, wherein The cross-sectional area difference between the through hole and the nut core main body meets the preset requirement of the activity amount of the center point position of the nut core.

9. The mobile nut for battery pack installation according to claim 1, wherein The extension length of the four protruding parts and the height of the nut core bottom meet the preset requirement of the inclination of the perpendicularity of the nut core.

10. The mobile nut for battery pack installation according to claim 1, wherein The length difference of the rectangle is 0-10mm.

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