Electric connection terminal

By using a non-bending L-shaped connection part in the electrical connection terminal, the mating end and the connection end are connected into one through a plane bent cutting method, which solves the problem of heat generation and fracture caused by changes in impedance at the bend, and achieves higher safety and reliability.

CN222785496UActive Publication Date: 2025-04-22SHENZHEN JINLING ELECTRONICS
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Patent Information

Application Number
CN202421395195.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-06-18
Publication Date
2025-04-22
Estimated Expiration
2034-06-18

AI Technical Summary

Technical Problem

The existing electrical connection terminals generate heat due to impedance changes at the bend and are prone to breaking, which affects the safety of use.

Method used

The non-bending L-shaped connection part is adopted to connect the mating end and the connection end into one through a plane bent cut, avoiding bending and ensuring that the impedance of the connection terminal is stable after conduction.

Benefits of technology

Through the design of the non-bending L-shaped connection part, the internal impedance changes of the electrical connection terminal are avoided, the risk of heating is reduced, and the safety and reliability of the electrical connection terminal are improved.

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Abstract

The utility model relates to the field of metal terminals, and discloses an electric connection terminal, which comprises a matching end distributed along a first direction and matched with a butt joint terminal in a plugging way, a connecting end distributed along a second direction and connected with a conductive element, and a non-bending L-shaped connecting part used for connecting the matching end and the connecting end into a whole. The connection between the conductive element and the butt joint terminal is realized through the matching between the matching end and the connecting end, the communication between the matching end and the connecting end in different directions is realized in a plane bending and cutting manner through the non-bending L-shaped connecting part, the realization through bending is avoided, the impedance change in the whole electrical connection terminal is reduced or even avoided, and the electrical connection efficiency is improved. And the safety of the whole electric connection terminal is improved.
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Description

Technical Field

[0001] The utility model relates to the field of metal terminals, in particular to an electrical connection terminal. Background Art

[0002] The electrical connection terminal is a terminal structure on a data connector. It is used in automobiles to transmit data and is suitable for the high-speed dynamic environment of automobiles. When in use, the electrical connection terminal realizes data transmission through cooperation with the docking terminal.

[0003] Some existing electrical connection terminals are assembled in an insulating housing, and then connected to the electrical connection terminal with a wire. However, after the existing electrical connection terminal is fixedly connected to the wire, the matching direction between the wire and the electrical connection terminal is different from or even perpendicular to the matching direction between the butt terminal and the electrical connection terminal. Therefore, the two ends of the electrical connection terminal used to match the wire and the butt terminal need to be bent. Due to mechanical changes at the bend, the impedance inside the bend changes due to the long-term transmission of electrical signals during the conduction process of the electrical connection terminal. The bend heats up and is easily broken, affecting the use of the electrical connection terminal. Utility Model Content

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is to provide an electrical connection terminal to solve the problem of impedance change caused by bending between the two ends of the electrical connection terminal.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an electrical connection terminal including a mating end distributed along a first direction and plugged into a docking terminal, a connecting end distributed along a second direction and connected to a conductive element, and a non-bending L-shaped connecting portion for connecting the mating end and the connecting end into one, so that the mating end and the connecting end of the terminal are oriented in different directions by means of plane bending and cutting, so as to meet the requirements of the conductive components and docking terminals in different directions to cooperate with it, avoid the impedance reduction and heat generation caused by bending after the terminal is energized and cause breakage, thereby improving safety.

[0006] Furthermore, the non-bending L-shaped connecting portion is a sheet-like structure, having a first outer edge distributed along the second direction, a first inner edge, a first end edge connected to the first outer edge and the first inner edge at one end toward the mating end, a second outer edge distributed along the first direction and smoothly connected to the first outer edge, a second inner edge connected to the first inner edge, and a second end edge connected to the second outer edge and the second inner edge at one end toward the connecting end; the first end edge is connected to the mating end, and the second end edge is connected to the connecting end, so as to achieve distribution of the mating end and the connecting end in different directions by plane bending.

[0007] Furthermore, a support portion is integrally extended from the first inner edge and is used to penetrate into the external insulating shell, and the support portion has a third end edge facing the mating end; the mating end includes two elastic portions extending from the first end edge and the third end edge respectively along the first direction, and the two elastic portions are distributed at intervals, and a first plug-in cavity is formed between the two elastic portions for the docking terminal to penetrate therein along the first direction, so that the docking terminal and the mating end can be limited and connected by elastically clamping the docking terminal.

[0008] Furthermore, the supporting portion includes a first side panel formed by bending and extending from a first inner edge along a third direction perpendicular to the second direction, and a second side panel formed by bending and extending from the first side panel along the second direction, the second side panel having a third outer edge and a third inner edge distributed along the second direction, the first side panel being connected to the third inner edge, and a side of the second side panel connected to the third outer edge and the third inner edge toward the mating end is defined as a third end edge, so that the first end edge and the third end edge are relative and spaced apart to ensure the connection between the two elastic portions.

[0009] Furthermore, the support portion also includes a third side plate that is bent and extended from the third outer edge toward the first outer edge along a third direction, and a first avoidance space for the third side plate to move is provided on the first end edge and the third end edge, so that the third side plate can move relatively to limit the support portion when the support portion is inserted into the insulating shell.

[0010] Furthermore, a first barb is convexly formed on one side of the third side plate facing away from the first side plate for limiting the position of the support portion after the support portion penetrates into the external insulating shell, so as to prevent the support portion from falling off after being inserted into the insulating shell.

[0011] Furthermore, the two elastic parts have abutment portions on one end away from the supporting portion, the middle portions of which are bent and protruded toward each other along the third direction, so as to press against the butt terminal when the butt terminal is inserted therein.

[0012] Furthermore, the connecting end includes an extension portion extending from the second end along the second direction and an embracing portion extending in a mirror-like manner from both sides of the extension portion along the first direction, and a second plug-in cavity for a conductive element to pass therethrough along the second direction is formed between the embracing portions on both sides, so that the conductive element can be crimped to achieve position limiting and conduction of the conductive element; the supporting portion is an overall rectangular cylindrical structure, and the free end of the supporting portion is abutted against the external insulating shell in four directions, so that the electrical connection terminal is more stable and reliable when being pulled out from the docking terminal.

[0013] An electrical connection terminal of the utility model has at least the following beneficial effects: the connection between the conductive element and the docking terminal is achieved through the cooperation between the mating end and the connecting end, and the connection in different directions between the mating end and the connecting end is achieved by plane bending and cutting through a non-bending L-shaped connecting portion, avoiding bending, reducing or even avoiding the impedance change inside the entire electrical connection terminal, and improving the safety of the entire electrical connection terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0015] Figure 1 This is a structural schematic diagram of Embodiment 1 of the electrical connection terminal of the utility model;

[0016] Figure 2 It is a structural schematic diagram of another angle of the first embodiment of the electrical connection terminal of the utility model;

[0017] Figure 3 This is a structural schematic diagram of a second embodiment of the electrical connection terminal of the utility model;

[0018] Figure 4 It is a structural schematic diagram of another angle of the second embodiment of the electrical connection terminal of the utility model;

[0019] Figure 5 It is a cross-sectional view of the second embodiment of the electrical connection terminal of the utility model.

[0020] The meanings of the symbols in the accompanying drawings are:

[0021] Non-bending L-shaped connecting portion-1; base-11; first outer edge-111; first inner edge-112; first end edge-113; second outer edge-114; second inner edge-115; second end edge-116; support portion-12; third end edge-120; first side plate-121; second side plate-122; third side plate-123; first avoidance space-124; first barb-125; fourth side plate-126; fifth side plate-127; sixth side plate-128; slot-1291; convex bulge-1292; second barb-1293; third barb-1294; third outer edge-1295; third inner edge-1296; movable cavity-13; mating end-2; elastic portion-21; abutment portion-22; connecting end-3; extension portion-31; embracing portion-32. DETAILED DESCRIPTION

[0022] The utility model will be further described below in conjunction with the accompanying drawings.

[0023] Embodiment 1:

[0024] like Figure 1 to Figure 2 As shown, an electrical connection terminal of the utility model includes a non-bending L-shaped connection part 1 (non-bending L-shaped connection part), a mating end 2 distributed along a first direction and plugged with a docking terminal, and a connecting end 3 distributed along a second direction and connected to a conductive element. The non-bending L-shaped connection part 1 is used to connect the mating end 2 and the connecting end 3 into one body. The non-bending L-shaped connection part 1 is connected to the mating end 2 and the connecting end 3 respectively through a sheet structure that is bent and cut in an L-shaped plane, so that the mating end 2 and the connecting end 3 are distributed in different directions in a non-bending manner, thereby avoiding the problem that the internal impedance of the non-bending L-shaped connection part 1 is reduced after conduction, causing the non-bending L-shaped connection part 1 to heat up and break. It should be noted that the mating end 2, the connecting end 3 and the non-bending L-shaped connection part 1 are all integrally formed and made of conductive metal materials such as copper.

[0025] In this embodiment, the non-bending L-shaped connecting portion 1 is a sheet-like structure and has a base 11 and a supporting portion 12. The base 11 cooperates with the supporting portion 12 to achieve the connection and cooperation between the mating end 2 and the connecting end 3. The base 11 is an L-shaped sheet-like structure and has a first outer edge 111 distributed along the second direction, a first inner edge 112, a first end edge 113 connected to the first outer edge 111 and the first inner edge 112 toward one end of the mating end 2, a second outer edge 114 distributed along the first direction and connected to the first outer edge 111, a second inner edge 115 connected to the first inner edge 112, and a second end edge 116 connected to the second outer edge 114 and the second inner edge 115 toward one end of the connecting end 3. The mating end 2 is integrally connected to the first end edge 113, and the connecting end 3 is integrally connected to the second end edge 116. In this embodiment, one end of the base 11 extends along a plane in the first direction and forms a first end edge 113 at the end, and the other end of the base 11 extends along a plane from the first inner edge 112 away from the first end edge 113 along the second direction and forms a second end edge 116 at the end, so that the entire base 11 is a sheet-like L-shaped structure without bending. The two sides adjacent to the first end edge 113 are respectively the first outer edge 111 and the first inner edge 112, and the two sides adjacent to the second end edge 116 are respectively the second outer edge 114 and the second inner edge 115, the second inner edge 115 and the second outer edge 114 are connected and L-shaped, and the first outer edge 111 and the second outer edge 114 are connected and L-shaped. After the mating end 2 is connected to the first end edge 113 and the connecting end 3 is connected to the second end edge 116, the mating end 2 and the connecting end 3 are distributed in different directions respectively. In this embodiment, the first direction and the second direction can be arranged perpendicular to each other.

[0026] In the content defined in this embodiment, the support portion 12 is integrally extended from the first inner edge 112 to be inserted into the external insulating shell, thereby increasing the contact area between the non-bending L-shaped connecting portion 1 and the insulating shell to enhance the connection stability between the electrical connection terminal and the insulating shell. The support portion 12 includes a first side plate 121 formed by bending and extending from the first inner edge 112 along a third direction perpendicular to the second direction, a second side plate 122 formed by bending and extending from the first side plate 121 along the second direction, and a third side plate 123 formed by bending and extending from the third outer edge 1295 toward the first outer edge 111 along the third direction. The first side plate 121, the second side plate 122 and the third side plate 123 are used to form a rectangular cylindrical structure to prevent the non-bending L-shaped connecting portion 1 from rotating when cooperating with the insulating shell. The third side plate 123 is used to limit the movement of the non-bending L-shaped connecting portion 1 in the first direction to prevent the electrical connection terminal from falling off. The free end of the support portion is abutted against the external insulating shell in four directions, so that the electrical connection terminal is more stable and reliable when being pulled out from the docking terminal. In this embodiment, the base 11, the first side panel 121, the second side panel 122 and the third side panel 123 are sequentially connected and integrally formed, the second side panel 122 has a third outer edge 1295 and a third inner edge 1296 distributed along the second direction, and the first side panel 121 has two fourth inner edges distributed along the third direction, the two fourth inner edges of the first side panel 121 are respectively connected to the first inner edge 112 and the third inner edge 1296, and the side of the second side panel 122 connected to the third outer edge 1295 and the third inner edge 1296 toward the mating end 2 is defined as the third end edge 120, and the third end edge 120 is arranged relative to the side of the support portion 12 toward the mating end 2. In this embodiment, the first end edge 113 and the third end edge 120 have a first avoidance space 124 for the third side plate 123 to move. Specifically, an L-shaped notch is formed between the first outer edge 111 and the first end edge 113, and an L-shaped notch is also formed between the third outer edge 1295 and the third end edge 120. The two L-shaped notches are the first avoidance space 124, and the third side plate 123 is located in the first avoidance space 124, and the side of the third side plate 123 facing the base 11 is a free side and is movable, and the free side of the third side plate 123 is inclined along the second direction toward the outside of the first avoidance space 124, so that the inner wall of the insulating shell can squeeze the third side plate 123 when it is inserted into the insulating shell, and the third side plate 123 presses against the inner wall of the insulating shell to achieve the purpose of limiting, thereby realizing the anti-slip effect. At the same time, the existence of the first avoidance space 124 can limit the penetration depth of the electrical connection terminal after the insulating shell is adapted to it.Preferably, a first barb 125 is protruded from the side of the third side plate 123 facing away from the first side plate 121, and is used for limiting the position after the support portion 12 is inserted into the external insulating shell. The first barb 125 extends from the third side plate 123 toward the second outer edge 114 and is inclined toward the side away from the first side plate 121. The first barb 125 is made of elastic material so that it can deform and rebound after being squeezed, thereby achieving limiting. When the third side plate 123 is pressed against the insulating shell, the first barb 125 is pressed against the insulating shell to further enhance the firmness between the third side plate 123 and the insulating shell.

[0027] In this embodiment, the mating end 2 includes two elastic portions 21 extending from the non-bending L-shaped connecting portion 1 along the first direction, and the two elastic portions 21 are distributed at intervals. A first plug-in cavity is formed between the two elastic portions 21 for the docking terminal to pass through along the first direction, so as to achieve clamping and limiting cooperation with the docking terminal and realize conduction with the docking terminal. The two elastic parts 21 extend from the first end edge 113 and the third end edge 120 along the first direction toward the side away from the connecting end 3, and the two elastic parts 21 have abutment parts 22 on the ends away from the supporting part 12, the middle parts of which are bent and convex toward each other along the third direction, so that the elastic part 21 gradually narrows from the side close to the non-bending L-shaped connecting part 1 to the abutment part 22, and then gradually widens from the abutment part 22 to the side away from the non-bending L-shaped connecting part 1. The gradually widening end of the elastic part 21 is in a trumpet shape to guide the docking terminal so that the docking terminal can be quickly squeezed into the first plug-in cavity. The width at the position of the abutment part 22 is smaller than the width of the docking terminal, so that the abutment part 22 presses against the docking terminal when the docking terminal is squeezed into the position of the abutment part 22.

[0028] In this embodiment, the connection end 3 includes an extension portion 31 extending from the second end edge 116 along the second direction and an embracing portion 32 extending from both sides of the extension portion 31 in a mirror image along the first direction. A second plug-in cavity for a conductive element to be inserted therein along the second direction is formed between the two embracing portions 32. The second plug-in cavity allows a conductive element such as a wire to be inserted therein. The embracing portion 32 can press the conductive element inserted into the second plug-in cavity, thereby limiting the conductive element and conducting the conductive element. In the content defined in this embodiment, the extension portion 31 extends from the second end edge 116 along the second direction toward the side away from the first outer edge 111 and is formed in a strip-shaped sheet structure. The extension portion 31 has two fifth outer edges that are oppositely distributed and both adjacent to the second end edge 116. The embracing portions 32 can be set as two, and the two embracing portions 32 each include an extension segment extending in the same direction from the two fifth outer edges along the third direction, and the two opposite extension segments extend obliquely away from one end of the extension portion 31 so that the embracing portion 32 is in a U-shaped structure. The side of the embracing portion 32 away from the extension portion 31 is open, and the inner cavity of the embracing portion 32 is narrower on the side close to the extension portion 31 and wider on the side away from the extension portion 31. The side with narrower inner cavity width of the embracing portion 32 is narrower than the width or diameter of the conductive element, and the side with wider inner cavity width away from the extension portion 31 is wider than the width or diameter of the conductive element. The portion enclosed between each embracing portion 32 and the extension portion 31 is defined as a second plug-in cavity to facilitate the insertion of the conductive element. The embracing portion 32 presses the conductive element after the conductive element is inserted to achieve position limiting and conduction.

[0029] Embodiment 2

[0030] like Figures 3 to 5As shown, an electrical connection terminal of the present embodiment includes a non-bending L-shaped connection portion 1, a mating end 2 distributed along a first direction and plugged into a docking terminal, and a connection end 3 distributed along a second direction and connected to a conductive element. The non-bending L-shaped connection portion 1 is a sheet-like structure and has a base 11 and a supporting portion 12. In the present embodiment, the mating end 2, the connection end 3 and the base 11 are consistent with the mating end 2, the connection end 3 and the base 11 of the first embodiment, and are not repeated here. In this embodiment, the support portion 12 includes a fourth side plate 126 formed by bending and extending from the first inner edge 112 along the third direction, a fifth side plate 127 formed by bending and extending from the fourth side plate 126 along the second direction, and a sixth side plate 128 formed by bending and extending from the fifth side plate 127 along the third direction and connected to the first outer edge 111, so that the support portion 12 and the base portion 11 are in a rectangular cylindrical structure and are connected end to end, and the free end of the support portion is abutted against the external insulating shell in four directions, so that the electrical connection terminal is more stable and reliable when being pulled out from the docking terminal, so as to improve the strength of the non-bending L-shaped connection portion 1, and prevent the non-bending L-shaped connection portion 1 from rotating when mating with the insulating shell. A slot 1291 is provided on the sixth side plate 128 along the second direction and the first direction, so that the non-bending L-shaped connection portion 1 can be relatively contracted when it penetrates into the insulating shell, so as to facilitate the non-bending L-shaped connection portion 1 and the inner cavity of the insulating shell to be pressed against each other and pressed against each other. An active cavity 13 is provided on both the non-bending L-shaped connecting portion 1 and the fifth side plate 127 along the third direction. The length of the active cavity 13 is greater than the length of the elastic portion 21. The side of the active cavity 13 on the base 11 close to the second outer edge 114 is defined as the first end edge 113, and the side of the active cavity 13 on the fifth side plate 127 close to the second outer edge 114 is defined as the third end edge 120. One end of the two elastic portions 21 is integrally connected to the first end edge 113 and the third end edge 120, respectively, and the other ends of the two elastic portions 21 extend inwardly in an inclined manner. The base 11, the fourth side plate 126, the fifth side plate 127 and the sixth side plate 128 are flush with each other on the side away from the second outer edge 114, and the enclosed inner cavity is through the first direction. There is a second avoidance space between the active cavity 13 and the elastic portion 21 for the elastic portion 21 to move, that is, each side edge of the elastic portion 21 is spaced from the active cavity 13, so that the elastic portion 21 can move relative to the active cavity 13. In this embodiment, the fourth side plate 126 is respectively provided with a second barb 1293 inclined toward the side away from the sixth side plate 128 for limiting the position after the support portion 12 is inserted into the external insulating shell, and a bulge 1292 is protruded toward the side of the sixth side plate 128. The bulge 1292 is formed by stamping the fourth side plate 126 from the outside to the inside, so that after the docking terminal is inserted into the first plug-in cavity, the bulge 1292 presses against the docking terminal to further enhance the limiting effect.The second barb 1293 is formed by the fourth side plate 126 in a U-shaped partition, and the split portion of the second barb 1293 is inclined toward the side away from the sixth side plate 128 so that it can press against the inner cavity of the insulating shell when the support portion 12 penetrates into the insulating shell. The split second barb 1293 can be deformed toward the split cavity after being squeezed by the insulating shell, so that the support portion 12 can penetrate into the insulating shell. The third barb 1294 for pressing against the docking terminal is arranged on the sixth side plate 128, tilted toward the fourth side plate 126. The third barb 1294 is also formed by the split of the sixth side plate 128, and the split portion is tilted toward the fourth side plate 126. The second barb 1293 and the third barb 1294 both extend tilted toward the second outer edge 114 to facilitate penetration into the insulating shell.

[0031] One embodiment of an electrical connection terminal of a power terminal structure of the utility model works as follows: one side of the mating end 2 is inserted into the insulating shell and the mating end 2 corresponds to the docking terminal, the connection end 3 is inserted into the insulating shell and the mating end 2 corresponds to the conductive element. After the installation is completed, the first plug-in cavity and the second plug-in cavity are respectively oriented in different directions, the conductive element is inserted into the second plug-in cavity, and the docking terminal is inserted into the first plug-in cavity to complete the installation of the electrical connection terminal.

Claims

1. An electrical connection terminal, characterized in that: It comprises a mating end distributed along a first direction and plugged with a butt terminal, a connecting end distributed along a second direction and connected to a conductive element, and a non-bending L-shaped connecting portion for connecting the mating end and the connecting end into one body.

2. The electrical connection terminal according to claim 1, characterized in that: The non-bending L-shaped connecting portion is a sheet-like structure, which has a first outer edge distributed along the second direction, a first inner edge, a first end edge connected to the first outer edge and the first inner edge at one end facing the mating end, a second outer edge distributed along the first direction and smoothly connected to the first outer edge, a second inner edge connected to the first inner edge, and a second end edge connected to the second outer edge and the second inner edge at one end facing the connecting end; the first end edge is connected to the mating end, and the second end edge is connected to the connecting end.

3. The electrical connection terminal according to claim 2, characterized in that: A support portion is integrally extended from the first inner edge to be inserted into the external insulating shell, and the support portion has a third end edge facing the mating end; the mating end includes two elastic portions extending from the first end edge and the third end edge respectively along the first direction, the two elastic portions are spaced apart, and a first plug-in cavity is formed between the two elastic portions for the mating terminal to pass therethrough along the first direction.

4. An electrical connection terminal according to claim 3, characterized in that: The supporting portion includes a first side panel formed by bending and extending from a first inner edge along a third direction perpendicular to the second direction, and a second side panel formed by bending and extending from the first side panel along the second direction, the second side panel having a third outer edge and a third inner edge distributed along the second direction, the first side panel being connected to the third inner edge, and a side of the second side panel connected to the third outer edge and the third inner edge toward an end of the mating end is defined as a third end edge.

5. An electrical connection terminal according to claim 4, characterized in that: The support portion further includes a third side plate which is bent and extended from the third outer edge toward the first outer edge along a third direction, and a first avoidance space for the third side plate to move is provided on the first end edge and the third end edge.

6. An electrical connection terminal according to claim 5, characterized in that: A first barb is convexly formed on one side of the third side plate facing away from the first side plate and is used for limiting the position of the support portion after it penetrates into the external insulating shell.

7. An electrical connection terminal according to claim 3, characterized in that: The supporting portion includes a fourth side plate extending from the first inner edge along a third direction, a fifth side plate extending from the fourth side plate along the second direction, and a sixth side plate extending from the fifth side plate along the third direction and connected to the first outer edge, and a groove is opened on the sixth side plate through the second direction and the first direction; an active cavity is opened through the third direction on the non-bending L-shaped connecting portion and the fifth side plate, and the sides of the two active cavities close to the second outer edge are respectively defined as a first end edge and a third end edge, and a second avoidance space for the elastic part to move is provided between the active cavity and the elastic part.

8. An electrical connection terminal according to claim 7, characterized in that: The fourth side plate is respectively provided with a second barb inclined toward the side away from the sixth side plate for limiting the position after the support part penetrates into the external insulating shell, and a bulge is formed toward the side of the sixth side plate; the sixth side plate is provided with a third barb inclined toward the side of the fourth side plate for tightening the docking terminal.

9. An electrical connection terminal according to claim 4 or 7, characterized in that: The two elastic parts have abutment parts on one end away from the supporting part, the middle part of which is bent and convexly arranged toward each other along the third direction.

10. An electrical connection terminal according to claim 9, characterized in that: The connecting end includes an extension portion extending from the second end along the second direction and an embracing portion extending in a mirror-image manner from both sides of the extension portion along the first direction, and a second plug-in cavity for allowing the conductive element to pass therethrough along the second direction is formed between the embracing portions on both sides; the supporting portion is an overall rectangular cylindrical structure, and the free end of the supporting portion is supported on the external insulating shell in four directions.