WO2023116810A1 - Via connection structure - Google Patents

Abstract

Provided in the present invention is a via connection structure, comprising a cable, a housing and a shielding cylinder, wherein the shielding cylinder is at least partially mounted at a front end of the housing; the cable penetrates the housing and the shielding cylinder, and a shielding layer of the cable is electrically connected to the shielding cylinder; and the front end of the shielding cylinder is provided with a contact terminal, and the shielding cylinder is electrically connected to the contact terminal. By means of the present invention, the technical problems of the shielding efficiency of a via connection structure being relatively low, and the weight and manufacturing costs of a product thereof being relatively large are solved.

Description

Via connection structure

related application

This application claims the priority of the Chinese invention patent with the patent application number 202123296612.4, the application date is December 24, 2021, and the invention name is "via connection structure".

technical field

The invention relates to the technical field of power electronic components, in particular to a via connection structure.

Background technique

High-voltage through-hole connectors are important components in new energy vehicles. The functions of the high-voltage through-hole connector mainly include: sealing, fastening the wiring harness, and shielding the electromagnetic field generated by the high-voltage cable.

The existing high-voltage through-hole connectors generally have low shielding effectiveness, high shielding contact resistance, complex product structure, many machined parts in parts, and high manufacturing costs.

Some high-voltage through-hole connectors use metal shells. Although the shielding effect is improved, the weight of the product is also increased, and the manufacturing cost of the product is also increased accordingly.

Contents of the invention

The object of the present invention is to provide a via connection structure to solve the technical problems of low shielding efficiency, high product weight and high manufacturing cost of the via connection structure.

Above-mentioned purpose of the present invention can adopt following technical scheme to realize:

The present invention provides a via connection structure, comprising: a cable, a housing and a shielding cylinder, the shielding cylinder is at least partially mounted on the front end of the housing, and the cable passes through the housing and the shielding cylinder. The shielding cylinder, and the shielding layer of the cable is electrically connected to the shielding cylinder; the front end of the shielding cylinder is provided with a contact terminal, and the shielding cylinder is electrically connected to the contact terminal.

Features and advantages of the present invention are:

In this through-hole connection structure, the shielding layer of the cable is directly connected to the device through the shielding cylinder, which shortens the current transmission path, reduces the shielding contact resistance, and improves the shielding effectiveness; the shielding cylinder surrounds the end of the cable and plays a connection function. At the same time, it also assumes the shielding function, so that the housing in the via connection structure can be made of non-metallic materials, which reduces product weight and manufacturing cost.

Description of drawings

The following drawings are only intended to illustrate and explain the present invention schematically, and do not limit the scope of the present invention. in:

Fig. 1 is the axonometric view of the via connection structure provided by the present invention;

FIG. 2 is an exploded view of the via connection structure shown in FIG. 1;

FIG. 3 is a front view of the via connection structure shown in FIG. 1;

Fig. 4 is a left view of the via connection structure shown in Fig. 1;

FIG. 5 is a top view of the via connection structure shown in FIG. 1;

Fig. 6 is a bottom view of the via connection structure shown in Fig. 1;

Fig. 7 is the sectional view of A-A direction of Fig. 6;

Fig. 8 is the sectional view of B-B direction of Fig. 6;

9 is a schematic structural diagram of a via connector in the via connection structure provided by the present invention;

FIG. 10 is a schematic structural diagram of a shell in the through-hole connector shown in FIG. 9;

Fig. 11 is an assembly diagram of the shielding contact cylinder and the inner shielding ring in the through-hole connector shown in Fig. 9;

Figure 12 is a top view of Figure 11;

Fig. 13 is a sectional view of C-C direction in Fig. 12;

FIG. 14 is a schematic structural diagram of a shielding contact cylinder in the via connector shown in FIG. 9;

FIG. 15 is a schematic structural diagram of the inner shielding ring and contact terminals in the through-hole connector shown in FIG. 9;

Fig. 16 is a structural schematic diagram of another embodiment of the inner shielding ring and the contact terminal in the via connection structure provided by the present invention;

Figure 17 is an exploded view of Figure 16;

Fig. 18 is a structural schematic diagram of another embodiment of the inner shielding ring and the contact terminal in the via connection structure provided by the present invention;

Fig. 19 is an exploded view of the inner shielding ring, the contact terminal and the shielding contact cylinder in the via connection structure provided by the present invention.

Detailed ways

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation manners of the present invention will now be described with reference to the accompanying drawings. In the description of the present invention, unless otherwise stated, "plurality" means two or more.

Option One

The present invention provides a via connection structure. As shown in FIGS. At the front end, the cable 81 is passed through the housing 10 and the shielding cylinder 20, and the shielding layer 83 of the cable 81 is electrically connected to the shielding cylinder 20; the front end of the shielding cylinder 20 is provided with a contact terminal 50, and the shielding cylinder 20 and the contact terminal 50 are connect.

When the via connection structure is connected to the device, the shielding tube 20 is in contact with the device, and the contact terminal 50 on the shielding tube 20 is connected to the device. At the same time, the shielding tube 20 is connected to the shielding layer 83 of the cable 81, and the shielding layer 83 passes through The shielding cylinder 20 forms a circuit with the equipment to realize shielding. In this via connection structure, the shielding layer 83 of the cable 81 is directly connected to the device through the shielding tube 20, which shortens the current transmission path, reduces the shielding contact resistance, and improves the shielding effectiveness; the shielding tube 20 surrounds the end of the cable 81 , while performing the connection function, it also undertakes the shielding function, so that the housing 10 in the via connection structure can be made of non-metallic materials, which reduces product weight and manufacturing cost.

As shown in FIG. 1 , a cable terminal 82 is connected to the front end of the cable 81 , and the cable 81 and the cable terminal 82 can be connected by crimping, friction welding, ultrasonic welding or plasma welding. The front end of the housing 10 is a plug-in end for connecting with equipment, and the end away from the plug-in end is a rear end. As shown in FIG. 2 , the casing 10 is provided with a plurality of connection holes 72 , and the through-hole connection structure includes a plurality of bushings 71 , and the casing 10 is fixed to the device through the connection holes 72 and the bushings 71 .

The shielding cylinder 20 has a cylindrical shape as a whole, and the side wall has no gaps and openings, which can realize 360° shielding. In one embodiment, the shielding cylinder 20 includes an outer shielding ring 40 and an inner shielding ring 30. As shown in FIG. 7 and FIG. 40 and the inner shielding ring 30, the shielding layer 83 is clamped by the outer shielding ring 40 and the inner shielding ring 30, and the connection is relatively firm; at the same time, the shielding layer 83 is respectively in contact with the inner wall of the outer shielding ring 40 and the outer wall of the inner shielding ring 30, It has a larger contact area and reduces the contact resistance. There are no gaps and openings around the inner shielding ring 30 and the outer shielding ring 40, realizing 360° shielding.

Further, the outer shielding ring 40 , the shielding layer 83 and the inner shielding ring 30 are fixed together by crimping or welding. Preferably, the outer shielding ring 40 , the shielding layer 83 and the inner shielding ring 30 are affixed together in a crimping manner, and pressure is applied to shrink and deform the outer shielding ring 40 inwardly, and the shielding layer 83 is pressed against the inner shielding ring 30 On the other hand, the reliability of the connection is improved, and it can withstand stronger vibration. The outer shielding ring 40 has a tubular structure, and its wall thickness is smaller than that of the inner shielding ring 30 , which facilitates deformation under pressure. The wall thickness of the inner shielding ring 30 is relatively large, which prevents the inner insulating layer of the cable 81 from being damaged when the shielding is crimped. By crimping, the outer shielding ring 40 is deformed, at least part of the outer wall of the outer shielding ring 40 forms a special-shaped part 41, and the outer shielding ring 40 becomes a non-rotating structure; the inner wall of the housing 10 is provided with a non-rotating structure, and the special-shaped part 41 and the The cooperation of the non-rotating structure can prevent the shielding cylinder 20 and the cable 81 from rotating relative to the housing 10 , thus playing the role of anti-rotation. Preferably, the outer shielding ring 40, the shielding layer 83 and the inner shielding ring 30 are affixed together using a hexagonal crimping process. During assembly, the inner shielding ring 30 is placed on the inner side of the shielding layer 83 of the cable 81, and the outer shielding The ring 40 is placed on the outside of the shielding layer 83, and the shielding layer 83 is between the inner shielding ring 30 and the outer shielding ring 40, and then hexagonally crimped, so that the outer shielding ring 40, the shielding layer 83 and the inner shielding ring 30 are connected It is stronger; moreover, the outer wall of the outer shielding ring 40 forms a hexagonal shaped portion 41 , and the inner wall of the housing 10 is provided with a hexagonal shaped hole 121 to achieve anti-rotation.

In one embodiment, the inner shielding ring 30 includes a large-diameter section 31 and a small-diameter section 32, as shown in FIGS. The outer shielding ring 40 is set outside the small-diameter section 32 and abuts against the large-diameter section 31, and the outer shielding ring 40 and the inner shielding ring 30 are positioned to prevent the two from moving during crimping, which is beneficial to ensure crimping Effect. The large-diameter section 31 can be disposed at the front end of the small-diameter section 32 .

There are many ways to arrange the contact terminal 50 , for example: the contact terminal 50 is arranged on the inner shielding ring 30 , or the contact terminal 50 is arranged on the outer shielding ring 40 . As shown in Figures 7-15, the contact terminal 50 is arranged at the front end of the inner shielding ring 30, and the shielding layer 83 of the cable 81 is directly connected to the device through the inner shielding ring 30 and the contact terminal 50, thereby reducing contact resistance.

In one embodiment, the contact terminal 50 and the inner shielding ring 30 have an integrated structure, which shortens the current transmission path and reduces the shielding contact resistance. The integrated structure of the inner shielding ring 30 and the contact terminal 50 can not only play a shielding function, but also Play the function of connection, reduce the manufacturing cost and product weight of the product. By turning the front end of the inner shielding ring 30 outward, a contact terminal 50 can be formed, and the outwardly turned contact terminal 50 has a larger contact surface, which ensures the connection effect with the device.

Further, the contact terminal 50 includes a plurality of terminal elastic pieces 51, and the plurality of terminal elastic pieces 51 protrude forward. As shown in FIGS. , the terminal shrapnel 51 is squeezed to be in close contact with the device, which increases the contact area, improves reliability, and is beneficial to ensure the shielding effect. As shown in FIG. 15 , a plurality of terminal elastic pieces 51 are distributed in the circumferential direction. The terminal elastic pieces 51 are cantilever-shaped and extend along the circumferential direction, which is convenient for compression deformation and full contact with the equipment, and reduces the resistance of the shielding connection circuit. Preferably, there are 12 terminal elastic pieces 51, which ensures the reliability of the shielding contact. During processing, the large-diameter section 31 of the inner shielding ring 30 is provided with an outward flanging, which is punched and then bent to form the terminal elastic piece 51 .

Further, the projected area of the terminal spring 51 on the front surface of the contact terminal 50 accounts for 45%-100% of the area of the front surface of the contact terminal 50 .

In one embodiment, the terminal elastic pieces 51 are distributed on the periphery of the contact terminal 50. As shown in FIG. 15 and FIG. The projected area of the front surface of the terminal 50 is the projected area of the peripheral area where the terminal shrapnel 51 is located; the front surface area of the contact terminal 50 is the sum of the projected area of the front surface area of the annular body 52 and the peripheral area.

In another embodiment, the contact terminal 50 includes a plurality of terminal elastic pieces 51 distributed in the circumferential direction, and the terminal elastic pieces 51 can be directly connected to the inner shielding ring 30 .

In order to verify the projected area of the terminal shrapnel 51 on the front surface of the contact terminal 50, the proportion of the front surface area of the contact terminal 50, and the influence on the contact resistance between the terminal shrapnel 51 and the docking device, the inventor selected cables 81 of the same size, The shell 10 and the shielding cylinder 20, as well as the same docking equipment, and various contact terminals 50 with different ratios of the projected area of the terminal spring 51 on the front surface of the contact terminal 50 to the front surface area of the contact terminal 50, to observe the terminal spring 51 The contact resistance between the device and the docking device.

The detection method of contact resistance is to use a micro-resistance measuring instrument to measure the resistance at the contact position between the contact terminal 50 and the docking equipment, and read the value on the micro-resistance measuring instrument, which is the contact resistance between the terminal shrapnel 51 and the docking equipment . In this embodiment, it is an ideal value that the contact resistance is less than 50 μΩ.

Table 1: The ratio of the projected area of the terminal shrapnel 51 on the front surface of the contact terminal 50 to the area of the front surface of the contact terminal 50 affects the contact resistance between the terminal shrapnel 51 and the docking device:

It can be seen from Table 1 that when the projected area of the terminal shrapnel 51 on the front surface of the contact terminal 50 accounts for less than 45% of the front surface area of the contact terminal 50, the contact resistance between the terminal shrapnel 51 and the docking device is greater than 50mΩ, and the contact resistance does not meet the requirements. Required value. Therefore, the inventors set the projected area of the terminal spring 51 on the front surface of the contact terminal 50 to account for 45%-100% of the area of the front surface of the contact terminal 50 .

In another embodiment, the contact terminal 50 and the inner shielding ring 30 have a separate structure. The contact terminal 50 includes a ring body 52 and an inner elastic piece 53 formed on the inner wall of the ring body 52, as shown in FIGS. 16-19 , the ring The body 52 is sleeved outside the inner shielding ring 30, and the inner elastic piece 53 is in contact with the outer wall of the inner shielding ring 30. After the contact terminal 50 and the inner shielding ring 30 are respectively processed and formed, they are assembled together by the elastic force of the inner elastic piece 53, which reduces the Processing difficulty. Further, the inner elastic piece 53 has an arc portion 531 , so that there is a larger contact area between the inner elastic piece 53 and the inner shielding ring 30 , which ensures the connection reliability between the two. As shown in FIG. 16 and FIG. 17 , the front end of the inner shielding ring 30 is provided with a first boss 33 , and the annular body 52 abuts against the first boss 33 to position the contact terminal 50 and the inner shielding ring 30 .

The structural form of the casing 10 is not limited to one type: the casing 10 may be a one-piece structure, or may be assembled from multiple parts. In one embodiment, the housing 10 includes a housing 11 and a shielding contact cylinder 12. The housing 11 is detachably connected to the shielding contact cylinder 12. The shielding cylinder 20 is installed in the shielding contact cylinder 12. By replacing different shielding contact cylinders 12, the Adapt to shielding cylinder 20 and cable 81 of various sizes and specifications, the outer wall of shielding contact cylinder 12 cooperates with housing 11, and the outer dimensions of shielding contact cylinder 12 of different specifications can be kept consistent, so that there is no need to replace housing 11, reducing the number of parts , for easy assembly. The housing 11 provides assembly space for various components, and protects components such as the shielding cylinder 20 and the shielding contact cylinder 12 from external damage.

Further, the inner hole of the shielding contact cylinder 12 includes a special-shaped hole 121, the outer wall of the shielding cylinder 20 is provided with a special-shaped part 41, the shielding cylinder 20 is installed in the shielding contact cylinder 12, the special-shaped part 41 matches the special-shaped hole 121, and the special-shaped part 41 Both the non-rotating structure and the special-shaped hole 121 can restrict the rotation of the shielding cylinder 20 and the cable 81 and improve the stability. Specifically, the special-shaped part 41 is located on the outer wall of the outer shielding ring 40. The outer shielding ring 40 is in the shape of a cylinder in its initial state. After crimping, the outer shielding ring 40 is deformed to form the special-shaped part 41. The anti-rotation components are realized separately, thereby further reducing the cost.

The special-shaped portion 41 may be hexagonal, and after the hexagonal crimping process, the outer wall of the outer shielding ring 40 is hexagonal; the special-shaped hole 121 is a hexagonal hole. The size of the special-shaped hole 121 is larger than that of the special-shaped part 41, so as to reserve a movable margin, so that the shielding cylinder 20 maintains a certain amount of free rotation relative to the housing 10, and facilitates the alignment of the housing 10 and the bolt hole when the through-hole connection structure and equipment are assembled. And keep a good fit.

As shown in FIG. 13 and FIG. 14 , the inner hole of the shielding contact cylinder 12 further includes a round hole portion 122 , and the round hole portion 122 is located at the front end of the special-shaped hole 121 . The cross-section of the special-shaped hole 121 is smaller than the cross-section of the circular hole portion 122, and the special-shaped hole 121 can prevent the large-diameter section 31 of the inner shielding ring 30 from entering, and the large-diameter section 31 is limited in the circular hole portion 122 to prevent the inner shielding ring from entering. 30 moves to the rear end to realize the limit. By cooperating with the shielding contact cylinder 12 , the integrated structure of the inner shielding ring 30 and the contact terminal 50 can not only play a shielding function, but also play a connection function, and also play a position-limiting function.

As shown in Figures 10-14, the outer wall of the shielding contact cylinder 12 is provided with a concave portion 141, which cooperates with the convex portion 142 on the inner wall of the housing 11 to play an anti-rotation function; The arm 151 intersects with the groove 152 on the inner wall of the housing 11 to play a position-limiting role and improve the connection stability.

In one embodiment, the front end of the shell 11 is covered with a peripheral sealing ring 61, as shown in Figure 9 and Figure 14, the front end of the shielding contact cylinder 12 is provided with a second boss 123, and the peripheral sealing ring 61 is located on the second boss 123 on the rear side, the second boss 123 can limit the peripheral sealing ring 61 from falling off. As shown in FIG. 7 and FIG. 8 , a cable sealing ring 62 sleeved on the cable 81 is provided inside the housing 11 , and a rear protective cover 63 is connected to the rear end of the housing 11 . The combination of the peripheral sealing ring 61 and the cable sealing ring 62 achieves a correspondingly higher level of protection. The side wall of the housing 11 is provided with a second elastic arm 111 , and the rear protective cover 63 and the housing 11 are connected together through the second elastic arm 111 .

The assembly cavity 101 runs through both ends of the housing 11 . The cable 81 passes through the rear protective cover 63 , the cable sealing ring 62 , the shielding cylinder 20 , the shielding contact cylinder 12 and the peripheral sealing ring 61 sequentially through the assembly cavity 101 . The via connection structure has superior shielding performance, relatively simple structure, and low manufacturing cost. In one embodiment, the housing 10 is provided with a plurality of assembly cavities 101, and the via connection structure includes a plurality of shielding cylinders 20, and the shielding cylinders 20 are installed in each assembly cavity 101 in a one-to-one correspondence, and the plurality of cables 81 can be installed on each shielding tube 20 in a one-to-one correspondence.

In one embodiment, the shell 10 is made of insulating material, and the shielding cylinder 20 is made of conductive material. Specifically, the outer shielding ring 40 and the inner shielding ring 30 can be made of metal; the material of the shielding contact cylinder 12 and the shell 11 is plastic, and the shell 11 can be PA66 (polyamide 66, Polyamide-66), and the weight of the plastic material is lower than Metal material and low cost.

In one embodiment, the peripheral sealing ring 61 and the cable sealing ring 62 are integrally injection molded on the housing 10 .

Option II

The present invention provides a through-hole connector. As shown in FIG. 9 , the through-hole connector includes: a housing 10 and a shielding cylinder 20, the shielding cylinder 20 is mounted on the front end of the housing 10, and the cable 81 can be passed through the The shell 10 and the shielding cylinder 20 , and the shielding layer 83 of the cable 81 can be connected with the shielding cylinder 20 ; the front end of the shielding cylinder 20 is provided with a contact terminal 50 .

When the cable 81 is connected to the device through the via connector, the shielding cylinder 20 is in contact with the device, the contact terminal 50 on the shielding cylinder 20 is connected to the device, and at the same time, the shielding cylinder 20 is connected to the shielding layer 83 of the cable 81. The shielding layer 83 forms a loop with the equipment through the shielding cylinder 20 to realize shielding. The shielding layer 83 of the cable 81 is directly connected to the device through the shielding cylinder 20, which shortens the current transmission path and reduces the shielding contact resistance; the shielding cylinder 20 surrounds the end of the cable 81, which not only performs the connection function, but also undertakes the shielding function. function, so that the housing 10 can be made of non-metallic materials, reducing product weight and manufacturing costs.

In one embodiment of the present invention, the shielding cylinder 20 includes an outer shielding ring 40 and an inner shielding ring 30, the outer shielding ring 40 is sleeved outside the inner shielding ring 30, and the outer shielding ring 40 can crimp the shielding layer 83 to the inner shielding ring. Outside the ring 30, the shielding layer 83 is clamped by the outer shielding ring 40 and the inner shielding ring 30, and the connection is relatively firm; at the same time, the shielding layer 83 is in contact with the inner wall of the outer shielding ring 40 and the outer wall of the inner shielding ring 30 respectively, and has a larger contact The area reduces the contact resistance; the inner shielding ring 30 and the outer shielding ring 40 have no gaps and openings around them, realizing 360° shielding.

The above descriptions are only illustrative specific implementations of the present invention, and are not intended to limit the scope of the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present invention.

Claims (13)

1. A via connection structure, which includes: a cable, a housing and a shielding cylinder, the shielding cylinder is at least partially installed on the front end of the housing, and the cable is passed through the housing and the shielding The shielding layer of the cable is electrically connected to the shielding cylinder; the front end of the shielding cylinder is provided with a contact terminal, and the shielding cylinder is electrically connected to the contact terminal.
2. The via connection structure according to claim 1, wherein the shielding cylinder comprises an outer shielding ring and an inner shielding ring, the outer shielding ring is sleeved outside the inner shielding ring, and the shielding layer is arranged on the between the outer shielding ring and the inner shielding ring.
3. The via connection structure according to claim 2, wherein the outer shielding ring, the shielding layer and the inner shielding ring are fixedly connected together by crimping or welding.
4. The via connection structure according to claim 2, wherein the inner shielding ring includes a large-diameter section and a small-diameter section, and the outer shielding ring is sleeved outside the small-diameter section and abuts against the large-diameter section.
5. The via connection structure according to claim 2, wherein the contact terminal is arranged at the front end of the inner shielding ring, and the contact terminal comprises a plurality of terminal elastic pieces protruding forward.
6. The via connection structure according to claim 5, wherein the contact terminal and the inner shielding ring are integrally formed.
7. The via connection structure according to claim 5, wherein the contact terminal comprises a ring body and an inner elastic piece formed on the inner wall of the ring body, the ring body is sleeved outside the inner shielding ring, the The inner elastic sheet abuts against the outer wall of the inner shielding ring.
8. The via connection structure according to claim 7, wherein a first boss is provided at the front end of the inner shielding ring, and the annular body abuts against the first boss.
9. The via connection structure according to claim 1, wherein the housing comprises a shell and a shielding contact cylinder, the shell is detachably connected to the shielding contact cylinder, and the shielding cylinder is installed in the shielding contact cylinder .
10. The via connection structure according to claim 9, wherein the inner hole of the shielding contact cylinder includes a special-shaped hole, and the outer wall of the shielding cylinder is provided with a special-shaped portion matching the special-shaped hole.
11. The via connection structure according to claim 9, wherein a peripheral sealing ring is sheathed on the front end of the housing, a second boss is provided on the front end of the shielding contact cylinder, and the peripheral sealing ring is located on the second The rear side of the boss.
12. The via connection structure according to claim 11, wherein the peripheral sealing ring and the cable sealing ring are integrally injection-molded on the housing.
13. The via connection structure according to claim 7, wherein the projected area of the terminal spring on the front surface of the contact terminal accounts for 45%-100% of the area of the front surface of the contact terminal.

Images