A waterproof large-current stud terminal and a large-current conductive connection structure adopting the same

Abstract

The utility model discloses a waterproof heavy current stud terminal and adopt the heavy current conductive connection structure of this stud terminal, wherein the stud terminal includes: terminal body and sealing ring, the terminal body includes the thread column, sealing section, boss and lead pin part of one-piece forming from top to bottom along the axial direction, the sealing section cross section is circular, and the radial dimension of sealing section is greater than the diameter of thread column, and there is a limit groove on the surface of sealing section, the sealing ring is sleeved on the limit groove, the boss bottom surface is provided with the mortise, and the lead pin part is distributed along the mortise periphery array. The utility model discloses the limit groove of forming on sealing section is positioned to sealing ring. When the stud terminal is cooperated with the connecting through -hole on the plastic shell, the sealing ring in the limit groove is in interference fit with the upper section through -hole, and the connecting through -hole is sealed, and its structure is simple, and it is convenient for processing and assembly.

Description

Technical Field

[0001] This utility model relates to the technical field of connector products, and specifically to a waterproof high-current stud terminal and a high-current conductive connection structure using the stud terminal. Background Technology

[0002] With the rapid development of new energy vehicles, the integration of various domain controllers, high-current power supply, high-current conversion, and high-current fast charging all place higher demands on the power supply current of each module. Under a 12V-48V voltage platform, the single-pin current carrying capacity needs to reach 150A-300A, and it must meet the international standards for automotive-grade (USCAR, LV214) low-voltage connectors. The best way to improve the current carrying capacity is to improve the conductivity of the conductor material.

[0003] Stud terminals are a commonly used type of high-current conductive terminal on the market. These terminals are typically formed by machining a single piece of copper. See Chinese Utility Model Patent No. 202322190035.3, which discloses "a high-current stud terminal." This technical solution uses metal sheet stamping and bending to reduce costs.

[0004] Both traditional one-piece molded stud terminals and the stamped stud terminals used in the above-mentioned technical solutions have the following problems in use: In actual use, the stud terminals need to be fixed to the plastic housing. Due to the diverse shapes of the plastic housing (such as curved surfaces), the waterproof design of this non-planar plastic housing is challenging, resulting in insufficient waterproof performance of the final product. In view of this, the inventors propose the following technical solution. Summary of the Invention

[0005] The first technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a waterproof high-current stud terminal.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a waterproof high-current stud terminal, comprising: a terminal body and a sealing ring, wherein the terminal body comprises a threaded stud, a sealing section, a boss and a lead portion integrally formed from top to bottom along the axial direction; the sealing section has a circular cross-section and the radial dimension of the sealing section is larger than the diameter of the threaded stud, a limiting groove is formed on the surface of the sealing section, the sealing ring is sleeved on the limiting groove, a countersunk hole is opened on the bottom surface of the boss, and the lead portion is arrayed around the countersunk hole.

[0007] Furthermore, in the above technical solution, protrusions are evenly distributed along the edge of the countersunk hole on the bottom surface of the boss, and the height of the protrusions is less than the height of the pin portion.

[0008] Furthermore, in the above technical solution, the cross-section of the boss is a regular polygon.

[0009] Furthermore, in the above technical solution, the countersunk hole extends upwards from the bottom surface to the sealing section.

[0010] Furthermore, in the above technical solution, the outer surface of the sealing ring is formed with at least two annular flanges.

[0011] Furthermore, in the above technical solution, the upper surface of the boss is formed with a guiding arc surface.

[0012] The second technical problem to be solved by this utility model is a high-current conductive connection structure using the above-mentioned waterproof high-current stud terminal. The technical solution adopted is as follows: it includes a stud terminal, a plastic shell, a wire connecting piece, and a nut. The plastic shell has a connection through hole for the terminal body to be inserted. The connection through hole includes an upper through hole that mates with a sealing section and a lower through hole that mates with a boss. A sealing ring located in a limiting groove is interference-fitted with the upper through hole to seal the connection through hole. The wire connecting piece that connects to an external wire is sleeved on the stud through its own opening. The stud and the nut are threadedly connected to secure the wire connecting piece.

[0013] Furthermore, in the above technical solution, the inner side of the plastic shell is integrally formed with a frame, which surrounds and forms the connecting through hole.

[0014] Furthermore, in the above technical solution, reinforcing ribs are formed on the outer surface of the frame.

[0015] Furthermore, in the above technical solution, the bottom surface of the boss in the terminal body protrudes downwards from the bottom surface of the frame.

[0016] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0017] Firstly, this invention features an integrally formed sealing section on the stud terminal, with a limiting groove formed on the sealing section to position the sealing ring. When the stud terminal mates with the connecting through hole on the plastic housing, the sealing ring located in the limiting groove is interference-fitted with the upper through hole, sealing the connecting through hole. Its structure is simple and easy to process and assemble.

[0018] Secondly, in order to adapt to non-flat plastic shells, this utility model extends and forms a frame on the inner side of the plastic shell, and uses the frame to form a connection through hole that matches the stud terminal. In this way, there is no need to form a flange or other structure on the outer surface of the plastic shell, which can ensure a stable connection between the stud terminal and the plastic shell. Attached Figure Description

[0019] Figure 1 This is a perspective view of the stud terminal in this utility model;

[0020] Figure 2 This is a perspective view of the stud terminal in this utility model from another angle;

[0021] Figure 3 This is an exploded perspective view of the stud terminal in this utility model;

[0022] Figure 4 This is a cross-sectional view of the mating of the stud terminal and the plastic housing of this utility model;

[0023] Figure 5 This is an exploded perspective view of the conductive connection structure in this utility model;

[0024] Figure 6 This is a three-dimensional view of the conductive connection structure in this utility model;

[0025] Figure 7 This is a perspective view of the conductive connection structure in this utility model from another angle;

[0026] Figure 8 This is an exploded perspective view of the present invention assembled with a circuit board;

[0027] Figure 9 This is a perspective view of the utility model in its first usage state.

[0028] Figure 10 This is a cross-sectional view of the utility model in its second usage state. Detailed Implementation

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

[0030] See Figures 1 to 3 As shown, the waterproof high-current stud terminal of this utility model includes: a terminal body 1 and a sealing ring 2. The terminal body 1 is usually integrally formed by machining a metal block. Specifically, the terminal body 1 is integrally formed from top to bottom along the axial direction as a threaded stud 11, a sealing section 12, a boss 13 and a lead portion 14.

[0031] The threaded post 11 is used to connect with external wires. The sealing section 12 has a circular cross-section, and the radial dimension of the sealing section 12 is larger than the diameter of the threaded post 11. A limiting groove 120 is formed on the surface of the sealing section 12, and the sealing ring 2 is fitted onto the limiting groove 120.

[0032] The boss 13 has a regular polygonal cross-section; in this embodiment, the boss 13 has a square cross-section, forming a stepped position between the boss 13 and the sealing section 12. During subsequent installation with the plastic housing 3, the stepped position provides axial restraint to the terminal body 1.

[0033] The bottom surface of the boss 13 is provided with a countersunk hole 130, which extends upward from the bottom surface to the sealing section 12. The countersunk hole 130 not only saves material, but also improves the heat distribution and helps alleviate the problem of high current temperature rise, which is difficult to dissipate heat in the center of a solid conductor and is prone to local overheating.

[0034] The pin portion 14 is used for soldering to the circuit board, and the pin portion 14 is arranged in an array around the countersunk hole 130. In addition, on the bottom surface of the boss 13, protrusions 15 are evenly distributed along the edge of the countersunk hole 130, and the height of the protrusions 15 is less than the height of the pin portion 14. The function of the protrusions 15 is to: when the terminal body 1 is soldered to the circuit board, the protrusions 15 form a certain degree of isolation between the bottom surface of the boss 13 and the circuit board, which facilitates soldering and heat dissipation.

[0035] See Figures 4 to 7 As shown, this is a stud terminal used for high-current conductive connection structure in this utility model. It includes: a stud terminal, a plastic housing 3, a wire connecting piece 4, and a nut 5. The stud terminal is the high-current waterproof stud terminal described above.

[0036] The plastic housing 3 has a connection through hole 30 for inserting the terminal body 1. The connection through hole 30 includes an upper through hole 301 that mates with the sealing section 12 and a lower through hole 302 that mates with the boss 13. The sealing ring 2 located in the limiting groove 120 is press-fitted with the upper through hole 301 to seal the connection through hole 30. The wire connecting piece 4, which is connected to an external wire, is fitted onto the threaded post 11 through its own sleeve hole 41. The threaded post 11 is threadedly connected to the nut 5 to fasten the wire connecting piece 4.

[0037] To facilitate the assembly of the stud terminal with the connection through hole 30 on the plastic housing 3, the upper surface of the boss 13 is formed with a guiding arc surface 131. That is, the surface of the step position between the boss 13 and the sealing section 12 is designed as an arc surface. The stud terminal is guided by the guiding arc surface 131, which facilitates insertion into the connection through hole 30.

[0038] To improve the sealing effect, the outer surface of the sealing ring 2 is formed with at least two annular flanges 21. When the parallel annular flanges 21 mate with the upper section of the through hole 301 in the connecting through hole 30, they can provide multiple waterproofing effects.

[0039] In actual production, the plastic housing 3 is usually a non-planar curved sheet material. To achieve a stable connection between the stud terminal and the plastic housing 3, a frame 31 is integrally formed on the inner side of the plastic housing 3. The shape of the frame 31 corresponds to the shape of the sealing section 12 and the boss 13 in the terminal body 1. That is, the frame 31 forms the connection through hole 30. Of course, to improve the overall strength of the frame 31, reinforcing ribs 311 are formed on the outer surface of the frame 31.

[0040] Combination Figure 5 As shown, during installation, the sealing ring 2 is fitted into the limiting groove 120, and the stud terminal is inserted into the connecting through hole 30 from the inside out. The boss 13 and the lower through hole 302 are used for positioning to prevent the terminal body 1 from rotating. The connecting through hole 30 is sealed by the interference fit between the sealing ring 2 and the upper through hole 301. Finally, the wire connecting piece 4 is fitted onto the threaded post 11 through the sleeve hole 41, and the wire connecting piece 4 is fastened by the threaded connection between the threaded post 11 and the nut 5.

[0041] Additionally, see Figure 8 As shown, this is an exploded perspective view of the present invention assembled with a circuit board (PCB) 6. The circuit board 6 has corresponding guide holes 60 formed on the pin portions 14. During installation, the pin portions 14 are inserted into the corresponding guide holes 60 of the circuit board 6, and soldering is performed simultaneously. The arrayed pin portions 14 are connected to the circuit board 6, achieving current shunting to reduce heat generation and making the connection between the stud terminals and the circuit board 6 more secure.

[0042] See Figure 9 As shown, this is a perspective view of the utility model in use, with three external wires connected to the circuit board 6 via stud terminals.

[0043] See Figure 10 As shown, this is a cross-sectional view of another usage state of this utility model. In this embodiment, three different specifications of terminal bodies 1a, 1b, and 1c are used for the transmission of different currents. Installation can be performed using any of the following methods:

[0044] Installation Method 1: First, after fitting the sealing rings 2 onto the three terminal bodies 1a, 1b, and 1c, insert them into the corresponding connecting through holes of the plastic housing 3 from bottom to top. Then, insert the pins of the three terminal bodies 1a, 1b, and 1c into the corresponding guide holes on the circuit board. Finally, solder the pins to the guide holes on the circuit board using reflow soldering. This installation method requires high axial positioning accuracy and high-quality plastic housing 3, typically requiring high-temperature resistant materials. Its advantages lie in relatively convenient assembly and high production efficiency.

[0045] Installation Method Two: First, insert the pins of the three terminal bodies 1a, 1b, and 1c into the corresponding guide holes on the circuit board, and then solder the pins to the guide holes on the circuit board using reflow soldering. Finally, after fitting the sealing rings 2 onto the three terminal bodies 1a, 1b, and 1c, insert them into the corresponding connecting through holes of the plastic housing 3 from bottom to top. In this installation method, the plastic housing 3 is assembled after reflow soldering, so the alignment material requirements are not high, which can reduce the overall product cost.

[0046] In use, users can choose any installation method as needed. Of course, the above description is only a specific embodiment of this utility model and is not intended to limit the scope of implementation of this utility model. All equivalent changes or modifications made to the structure, features and principles described in the claims of this utility model should be included in the scope of the claims of this utility model.

Claims

1. A waterproof high-current stud terminal, comprising: Terminal body (1) and sealing ring (2), characterized in that: the terminal body (1) includes a threaded post (11), a sealing section (12), a boss (13) and a pin portion (14) integrally formed from top to bottom along the axial direction. The sealing section (12) has a circular cross-section, and the radial dimension of the sealing section (12) is larger than the diameter of the threaded column (11). A limiting groove (120) is formed on the surface of the sealing section (12), and the sealing ring (2) is fitted onto the limiting groove (120). The bottom surface of the boss (13) is provided with a countersunk hole (130), and the pin portion (14) is arranged in an array around the countersunk hole (130).

2. The waterproof high-current stud terminal according to claim 1, characterized in that: On the bottom surface of the boss (13), there are protrusions (15) evenly distributed along the edge of the countersunk hole (130), and the height of the protrusions (15) is less than the height of the pin portion (14).

3. A waterproof high-current stud terminal according to claim 1, characterized in that: The cross-section of the boss (13) is a regular polygon.

4. A waterproof high-current stud terminal according to claim 1, characterized in that: The countersunk hole (130) extends upward from the bottom surface to the sealing section (12).

5. A waterproof high-current stud terminal according to claim 1, characterized in that: The outer surface of the sealing ring (2) is formed with at least two annular flanges (21).

6. A waterproof high-current stud terminal according to claim 1, characterized in that: The upper surface of the boss (13) is formed with a guide arc surface (131).

7. A high-current conductive connection structure, comprising: The stud terminal, plastic housing (3), wire connecting piece (4) and nut (5) are characterized in that: the stud terminal adopts a high current waterproof stud terminal as described in any one of claims 1-3; The plastic housing (3) is provided with a connection through hole (30) for the terminal body (1) to be inserted. The connection through hole (30) includes an upper through hole (301) that cooperates with the sealing section (12) and a lower through hole (302) that cooperates with the boss (13). The sealing ring (2) located in the limiting groove (120) is press-fitted with the upper through hole (301) to seal the connection through hole (30). The wire connecting piece (4) connected to the external wire is fitted onto the threaded post (11) through its own sleeve hole (41), and the threaded post (11) is threadedly connected to the nut (5) to fasten the wire connecting piece (4).

8. A high-current conductive connection structure according to claim 7, characterized in that: The inner side of the plastic shell (3) is integrally formed with a frame (31), which surrounds the connecting through hole (30).

9. A high-current conductive connection structure according to claim 8, characterized in that: A reinforcing rib (311) is formed on the outer surface of the frame (31).

10. A high-current conductive connection structure according to claim 8, characterized in that: The bottom surface of the boss (13) in the terminal body (1) protrudes downward from the bottom surface of the frame (31).

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