Small-pitch high-current connector

Abstract

The utility model relates to the field of electronic components, disclose a small -pitch large current connector, including the plastic shell body with first interposition cavity and second interposition cavity, interposition in the first interposition cavity's first terminal and interposition in the second interposition cavity's second terminal, first interposition cavity is arranged as several with small -pitch, first terminal includes the first welding end outside first interposition cavity, first welding end has the welding portion for welding in the circuit board and is connected with the tensile portion of welding portion for the tensile of welding portion is pulled when. The utility model discloses the tensile portion on the first welding end is provided with, makes the circuit board when being pulled in the process of plugging connector, the tensile portion makes the force on the welding portion be dispersed to the tensile portion and to the first interposition segment exert the force that is inclined to the interposition direction relative to, thereby greatly reduces the possibility that the first terminal is separated from the plastic shell body, promotes the stability and reliability of first terminal.

Description

Technical Field

[0001] This utility model relates to the field of electronic components, and in particular to a small-pitch, high-current connector. Background Technology

[0002] Small-pitch, high-current connectors are key components in the trend of miniaturization and high power in electronic devices. Their core feature is achieving efficient and stable current transmission within a compact space. To meet the increasing demands for miniaturization and high-density integration of electronic products and effectively save PCB space, small-pitch height-floating connectors or small-pitch height-floating connector assemblies are designed and manufactured. Here, "small pitch" refers to the extremely small center distance between the connector terminals, typically less than 1 mm.

[0003] In terms of application scenarios, it is widely used in consumer electronics (such as power management in mobile phones and tablets), industrial equipment (servo motors, AGV robots), automotive electronics (vehicle power modules, battery management systems) and medical instruments (portable diagnostic devices).

[0004] Existing small-pitch, high-current connectors typically include a plastic housing, a first terminal for conducting small currents, and a second terminal for conducting large currents. Both the first and second terminals need to be connected to a circuit board for electrical connection. The first terminal, connected to the first solder joint on the circuit board, is usually in a straight position. However, during use, the first solder joint and the circuit board are subjected to tension during insertion and removal. Because the first solder joint is straight and typically soldered entirely to the circuit board, it cannot distribute the force effectively under tension, causing the portion inserted into the plastic housing to pull outwards, affecting the stability of the first terminal. Utility Model Content

[0005] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a small-pitch high-current connector to solve the problem that the terminals are easily pulled out during the insertion and removal process.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: providing a small-pitch high-current connector including a plastic shell having a first insertion cavity and a second insertion cavity, a first terminal inserted into the first insertion cavity, and a second terminal inserted into the second insertion cavity, wherein the first insertion cavity is provided with a small pitch of several; the first terminal includes a first welding end located outside the first insertion cavity, the first welding end having a welding part for welding to a circuit board and a tensile part connected to the welding part for resisting tension when the welding part is pulled.

[0007] Furthermore, the first insertion cavity includes a first fastening cavity section, and the plastic housing has a welding surface for facing the circuit board side. The welding surface has an external cavity that communicates with the first fastening cavity section and is used to support the welding part therein. The first terminal also includes a first insertion section for insertion into the first fastening cavity section. The tensile part is connected to the first insertion section, and the side of the tensile part away from the first insertion section along the insertion direction has a spacer edge that is recessed relative to the first welding end and spaced apart from the circuit board after the first welding end is welded to the circuit board.

[0008] Furthermore, a first arc-shaped groove is recessed on one side of the spacer connected to the welded part to narrow the connection between the tensile part and the welded part.

[0009] Furthermore, the lap end of the tensile portion away from the welded portion is supported in the outer cavity, so that the lap end and the first welded end protrude in opposite directions along the width direction of the first insertion section. A second arc-shaped groove is recessed on the spacing side where the lap end is located, which narrows the lap end and corresponds to the connection between the outer cavity and the first insertion cavity.

[0010] Furthermore, a third arc-shaped groove is recessed at the position between the first arc-shaped groove and the second arc-shaped groove on the spacer edge, which is directly opposite the first insertion segment.

[0011] Furthermore, the first insertion section has protruding barbs on both sides along its width for abutting against the first fastening cavity section.

[0012] Furthermore, the first insertion cavity also includes a mating cavity section communicating with the first fastening cavity section along the insertion direction, and the first terminal also includes a mating section connected to the first insertion section; the plastic housing has mating surfaces distributed opposite to the welding surface, and the mating surface is recessed with a mating cavity communicating with the mating cavity section and for the complementary connector to be mated therein.

[0013] Furthermore, the mating cavity is covered with a shielding layer surrounding the mating cavity, and the shielding layer is arranged with an opening facing the side of the insertion cavity.

[0014] Furthermore, the second insertion cavity is connected to the mating cavity, and the second terminal includes a second insertion segment inserted into the second insertion cavity and a second soldering end for soldering to the circuit board. The second insertion segment has a mating cavity that connects to the mating cavity and allows the complementary connector to be inserted and connected therein.

[0015] Furthermore, the outer wall of the second insertion section is provided with a second barb for pressing against the second insertion cavity.

[0016] The small-pitch high-current connector of this utility model has at least the following beneficial effects: By providing a tensile part on the first welding end, when the circuit board is pulled during the insertion and removal process, the tensile part causes the force on the welding part to be distributed to the tensile part, and applies a force inclined relative to the insertion direction to the first insertion segment, thereby greatly reducing the possibility of the first terminal detaching from the plastic shell and improving the stability and reliability of the first terminal. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a half-sectional schematic diagram of the present invention; Figure 3 This is a side sectional view of the present invention; Figure 4 This is a schematic diagram showing the cooperation between the first terminal and the shielding layer of this utility model; Figure 5 This is a schematic diagram of the structure of the first terminal and the shielding layer with separate openings in this utility model; Figure 6 This is a schematic diagram of the structure of the second terminal of this utility model. The meanings of the labels in the attached diagram are as follows: Plastic shell 1, first insertion cavity 11, first fastening cavity section 111, main body 1111, narrowing section 1112, guide section 1113, mating cavity section 112, second insertion cavity 12, welding surface 13, mating surface 14, mating cavity 15, external cavity 16, first terminal 2, first welding end 21, welding part 211, tensile part 212, lap end 2121, spacer edge 2122, first arc groove 2123, second arc groove 2124, third arc groove 2125, first insertion section 22, transition section 221, first barb 222, mating section 23, second terminal 3, second insertion section 31, mating cavity 311, second barb 312, second welding end 32, shielding layer 4. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Please see Figures 1 to 6 The small-pitch high-current connector of this utility model includes a plastic housing 1 having a first insertion cavity 11 and a second insertion cavity 12, a first terminal 2 inserted into the first insertion cavity 11, and a second terminal 3 inserted into the second insertion cavity 12.

[0020] Please see Figures 1 to 3 The plastic housing 1 is injection molded from plastic and has a rectangular parallelepiped shape (not limited to this shape). Therefore, the plastic housing 1 has a length, width, and height (or thickness). In this embodiment, the two sides of the plastic housing along the height direction (hereinafter referred to as the "height direction") are respectively configured as a welding surface 13 and a mating surface 14. The welding surface 13 is used for connection with the circuit board, and the mating surface 14 is used for mating with the complementary connector. Two sets of symmetrically distributed first insertion cavities 11 are respectively opened on both sides of the plastic shell 1 along the width direction (hereinafter referred to as "width direction"). Each set is provided with multiple first insertion cavities 11 evenly distributed along the length direction (hereinafter referred to as "length direction"). The distance between any two adjacent first insertion cavities 11 in each set is within 1mm. In particular, in this embodiment, the distance between two adjacent first insertion cavities 11 can be 0.4mm to achieve small spacing. The first terminal 2 is matched with it so that after assembly, the distance between two adjacent first terminals 2 is about 0.4mm, achieving high-density integration and miniaturization.

[0021] The first insertion cavity 11 includes, along its height, a first fastening cavity section 111 and a mating cavity section 112 communicating with the first fastening cavity section 111. The first terminal 2 is inserted into the first insertion cavity 11 along its height, thus the height direction is configured as the insertion direction. The first fastening cavity section 111 communicates with the mating cavity section 112 along the insertion direction. The first fastening cavity section 111 extends through the welding surface 13 along the insertion direction, allowing the first terminal 2 to be inserted into the first insertion cavity 11 from the welding surface 13 side. The first fastening cavity section 111 is narrowed at one end near the mating cavity section 112, forming a narrower section 1112 narrower than the rest of the main body portion 1111. The connection between the main body portion 1111 and the narrower section 1112 has a gradually narrowing structure, forming a guide section 1113 located between the main body portion 1111 and the narrower section 1112. To facilitate the insertion of the first terminal 2, the main body portion 1111 is wide-mouthed on the side of the welding surface 13. The mating cavity 112 is formed from the narrowing section 1112 towards the mating surface 14 along the insertion direction, and the mating cavity 112 can penetrate the mating surface 14. In order to reduce electromagnetic interference between adjacent first terminals 2, a shielding layer 4 is installed in each mating cavity 112. The shielding layer 4 is covered on the cavity wall of the mating cavity 112 and surrounds the first terminal 2 after the first terminal 2 is inserted into it, so as to isolate electromagnetic interference between adjacent first terminals 2 and the outside.

[0022] The second insertion cavity 12 is located at the center between the two sets of first insertion cavities 11, and the second insertion cavity 12 is configured as multiple and distributed at equal intervals along the longitudinal direction. The second insertion cavity 12 penetrates the welding surface 13 and the mating surface 14 along the insertion direction.

[0023] A mating cavity 15 is recessed on the mating surface 14. Two sets of mating cavity segments 112 are respectively arranged on both sides of the mating cavity 15 along the width direction, and each mating cavity segment 112 is connected to the mating cavity 15 inward along the width direction. The shielding layer 4 is also connected to the mating cavity 15 inward, so that the shielding layer 4 is open on the side facing the mating cavity 15. The complementary connector achieves small current conduction by mating into the mating cavity 15 and contacting the first terminal 2 from the inner side of the mating cavity segment 112. The mating cavity 15 is connected to the second insertion cavity 12 and is wider than the second insertion cavity 12.

[0024] Please see Figures 2 to 5 The first terminal 2 includes a first welding end 21, a first insertion section 22 for insertion into the first fastening cavity 111, and a mating section 23 connected to the first insertion section 22 and for insertion into the mating cavity 112. The shielding layer 4 surrounds the mating section 23.

[0025] The first welding end 21 includes a welding portion 211 for welding to a circuit board and a tensile portion 212 for resisting tension when the welding portion 211 is pulled by the circuit board. The tensile portion 212 and the welding portion 211 are sequentially connected along the width direction, with the tensile portion 212 located on the inward side and the welding portion 211 located on the outward side. To facilitate the installation of the welding portion 211 and the tensile portion 212, an external cavity 16 communicating with the first fastening cavity section 111 is recessed on the welding surface 13 at the position corresponding to each first insertion cavity 11. When the first terminal 2 is installed in the first insertion cavity 11, both the welding portion 211 and the tensile portion 212 are supported in the external cavity 16. In another embodiment, the tensile portion 212 may be spaced apart from the cavity wall of the external cavity 16.

[0026] The tensile portion 212 is integrally connected to the end of the first insertion section 22 away from the first mating section 23 and is distributed along the width direction. The welding portion 211 is integrally connected to one end of the tensile portion 212 and protrudes on the side opposite to the width of the first insertion section 22. The end of the tensile portion 212 away from the welding portion 211 has a protrusion on the other side opposite to the width of the first insertion section 22, forming an overlapping end 2121. For this purpose, the external cavity 16 is recessed on both sides of the width of the first insertion cavity 11 corresponding to the tensile portion 212 and the welding portion 211, and is T-shaped as a whole, so that the overlapping end 2121 is supported in one side of the external cavity 16 and the welding portion 211 is supported in the other side of the external cavity 16 that spans the first insertion cavity 11, so that the overlapping end 2121 and the first welding end 21 protrude backwards along the width direction of the first insertion section 22. The side of the tensile portion 212 away from the first insertion segment 22 along the insertion direction is defined as a spacer side 2122. The spacer side 2122 is recessed relative to the side of the welding portion 211 facing the first insertion segment 22, so that when the welding portion 211 is welded to the circuit board, the spacer side 2122 is spaced from the circuit board, so that when the welding portion 211 is pulled, it can bend towards the tensile portion 212 and tilt the force. In order to make the force more easily tilted, a first arc-shaped groove 2123 is recessed on the side of the spacer side 2122 connected to the welding portion 211. The first arc-shaped groove 2123 is recessed from the spacer side 2122 and is arc-shaped, so that the connection between the tensile portion 212 and the welding portion 211 is narrowed and thinned, so that when the welding portion 211 is pulled, it changes part of the force direction through the first arc-shaped groove 2123, thereby improving the insertion stability of the first terminal 2. To further enhance the effect, a second arc-shaped groove 2124 is recessed at the position of the spacer edge 2122 and the overlapping end 2121. The second arc-shaped groove 2124 is recessed from the spacer edge 2122 and is arc-shaped, so that the overlapping end 2121 narrows at the edge of the first insertion cavity 11 along the insertion direction. This provides support for the end of the tensile part 212 away from the welding part 211. The second arc-shaped groove 2124 also disperses the force when the welding part 211 is pulled. At the same time, when the first terminal 2 is inserted, the first arc-shaped groove 2123 and the second arc-shaped groove 2124 provide a buffer space between the first terminal 2 and the plastic shell 1. Even if the first terminal 2 is squeezed hard, the force can be reduced by deformation through the welding part 211 and the first arc-shaped groove 2123 and the second arc-shaped groove 2124. A third arc-shaped groove 2125 is recessed at the position between the first arc-shaped groove 2123 and the second arc-shaped groove 2124 on the spacer edge 2122, which is directly opposite the first insertion section 22. The third arc-shaped groove 2125 reduces the material used in the first terminal 2 and further disperses the internal stress of the first terminal 2.

[0027] The first insertion segment 22 extends from the side of the tensile portion 212 away from the spacer edge 2122 along the insertion direction and is adapted to fit the main body portion 1111 of the first insertion cavity 11. A transition segment 221 is provided on the first insertion segment 22 corresponding to the guide segment 1113, so that the transition segment 221 and the guide segment 1113 are wedge-shaped to increase the bonding force between the first insertion segment 22 and the first fastening cavity segment 111. First barbs 222 protrude from both sides of the first insertion segment 22 along its width to abut against the first fastening cavity segment 111. The tips of the first barbs 222 face the welding portion 211 and are inclined outwards to facilitate insertion into the first fastening cavity segment from the welding surface 13 side along the insertion direction. The mating section 23 extends from the narrow end of the narrowing section 1112 along the insertion direction and is slightly narrower than the narrowing section 1112, allowing it to pass through the narrowing section 1112 and enter the inner side of the shielding layer 4 within the mating cavity section 112. The inward side of the mating section 23 is exposed in the mating cavity 15. The mating sections 23 are arranged at an angle on the inward side at the ends away from the first insertion section 22 to facilitate mating between the complementary connector and the mating cavity 15.

[0028] Please see Figures 1 to 3 , Figure 6 The first terminal 2 is configured with multiple terminals, such as four, corresponding to the second insertion cavity 12. Each second terminal 3 includes a second insertion segment 31 inserted into the second insertion cavity 12 and a second soldering end 32 for soldering to the circuit board. Both the second insertion segment 31 and the second insertion cavity 12 are cylindrical structures with matched diameters, so that the second insertion segment 31 is inserted into the second insertion cavity 12 along the insertion direction. To facilitate the second terminal 3 to be adapted and conductive after the complementary connector is inserted into the mating cavity 15, a mating cavity 311 is provided on the side of the second insertion segment 31 facing the mating cavity 15 along the insertion direction, which communicates with the mating cavity 15 and allows the complementary connector to be inserted and conductive therein. The mating cavity 311 extends through the side facing the mating cavity 15 along the insertion direction. To increase the connection strength between the second insertion segment 31 and the second insertion cavity 12, a second barb 312 is provided on the outer wall of the second insertion segment 31 for pressing against the second insertion cavity 12. The second barb 312 can have the same shape and structure as the first barb 222. Alternatively, the second barb 312 can be formed into a ring by wrapping around the outer wall of the second insertion section 31 based on the first barb 222. The second welding end 32 is also cylindrical with a diameter smaller than that of the second insertion section 31. A corresponding structure is provided on the circuit board to allow the second welding end 32 to penetrate or pass through the circuit board, and then it is connected to the circuit board by welding for the transmission of high current.

[0029] The working method of one embodiment of the small-pitch high-current connector of this utility model is as follows: insert the first terminal 2 into the first insertion cavity 11, insert the second terminal 3 into the second insertion cavity 12, then solder the first welding end 21 and the second welding end 32 onto the circuit board, and insert the complementary connector into the mating cavity 15 to achieve conduction.

Claims

1. A small-pitch, high-current connector, comprising a plastic housing having a first insertion cavity and a second insertion cavity, a first terminal inserted into the first insertion cavity, and a second terminal inserted into the second insertion cavity, wherein the first insertion cavity has a plurality of small-pitch components; characterized in that: The first terminal includes a first welding end located outside the first insertion cavity. The first welding end has a welding portion for welding to a circuit board and a tensile portion connected to the welding portion for resisting tension when the welding portion is pulled.

2. The small-pitch, high-current connector as described in claim 1, characterized in that: The first insertion cavity includes a first fastening cavity section. The plastic housing has a welding surface for facing the circuit board side. The welding surface has an external cavity that communicates with the first fastening cavity section and is used to support the welding part. The first terminal also includes a first insertion section for insertion into the first fastening cavity section. The tensile part is connected to the first insertion section, and the side of the tensile part away from the first insertion section along the insertion direction has a spacer edge that is recessed relative to the first welding end and spaced from the circuit board after the first welding end is welded to the circuit board.

3. The small-pitch, high-current connector as described in claim 2, characterized in that: The spacer edge is provided with a first arc-shaped groove on one side connected to the welded part, which narrows the connection between the tensile part and the welded part.

4. The small-pitch, high-current connector as described in claim 3, characterized in that: The lap end of the tensile portion away from the welded portion is supported in the outer cavity, so that the lap end and the first welded end protrude in opposite directions along the width direction of the first insertion section. A second arc-shaped groove is recessed on the spacing side where the lap end is located, which narrows the lap end and corresponds to the connection between the outer cavity and the first insertion cavity.

5. The small-pitch, high-current connector as described in claim 4, characterized in that: The spacer edge is recessed at the position between the first arc-shaped groove and the second arc-shaped groove, and is directly opposite the first insertion segment.

6. The small-pitch, high-current connector as described in claim 2, characterized in that: The first insertion section has protruding barbs on both sides along its width for abutting against the first fastening cavity section.

7. The small-pitch, high-current connector as described in claim 2 or 6, characterized in that: The first insertion cavity further includes a mating cavity section that communicates with the first fastening cavity section along the insertion direction, and the first terminal further includes a mating section connected to the first insertion section; the plastic housing has mating surfaces distributed opposite to the welding surface, and the mating surface is recessed with a mating cavity that communicates with the mating cavity section and allows the complementary connector to be mated therein.

8. The small-pitch, high-current connector as described in claim 7, characterized in that: The mating cavity is covered with a shielding layer surrounding the mating cavity, and the shielding layer is arranged with an open side facing the insertion cavity.

9. The small-pitch, high-current connector as described in claim 7, characterized in that: The second insertion cavity is connected to the mating cavity, and the second terminal includes a second insertion segment inserted into the second insertion cavity and a second soldering end for soldering to the circuit board. The second insertion segment has a mating cavity that is connected to the mating cavity and allows the complementary connector to be inserted and connected therein.

10. The small-pitch, high-current connector as described in claim 9, characterized in that: The outer wall of the second insertion section is provided with a second barb for pressing against the second insertion cavity.

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