Terminal Assemblies and Board-to-Board Connector Assemblies

Abstract

A terminal assembly includes a socket terminal and a plug terminal electrically contacting the socket terminal, the plug terminal includes a plug holding portion, a connecting portion extending backward from the plug holding portion, and a plug contact portion formed by vertically bending from the front end of the plug holding portion, the socket terminal includes a socket holding portion, a solder foot extending forward from the socket holding portion, and a socket contact portion electrically contacting the plug contact portion formed by vertically bending from the rear end of the socket holding portion, the socket contact portion and the plug contact portion are arranged face to face, the socket contact portion is provided with a contact groove in the vertical direction, the plug contact portion is provided with a contact convex strip inserted into the contact groove in the vertical direction, and the contact convex strip is electrically in contact with the contact groove in the lateral direction. The present application also provides a board-to-board connector assembly.

Description

Technical Field

[0001] The present application relates to the field of board-to-board connectors, and in particular to a terminal assembly and a board-to-board connector assembly. Background Art

[0002] Patent No. 201820584125.7 of the People's Republic of China discloses a board-to-board plug, socket and connector assembly, wherein the plug includes a plug body, a plug terminal formed in the plug body and a shielding shell covered outside the plug body, wherein the plug terminal includes a retaining portion formed in the plug body, a welding foot and a contact spring arm respectively extending from both ends of the retaining portion, and the plug body must form an elastic space for the contact spring arm to deform at the periphery of the contact spring arm, that is, a clearance portion must be formed at the periphery of the contact spring arm; when the plug terminal and the plug body are injection molded, because the size of the board-to-board connector is getting smaller and smaller, the structure is getting more and more sophisticated, such as a board-to-board plug with a terminal spacing of 0.35m and a group and height of 0.8mm, and a partition needs to be formed between the contact spring arms. After deducting the size and gap of the partition, the thickness of the mold part used for positioning the clearance portion is only 0.045mm, which requires very high precision for the terminal stamping process and the injection molding process, which is difficult for most domestic manufacturers to achieve. A few foreign manufacturers can achieve it, but the cost is very high. Utility Model Content

[0003] In view of this, it is necessary to provide a terminal assembly and a board-to-board connector assembly, which can solve the problem of needing to set at least one contact spring arm by changing the electrical contact mode between the socket terminal and the plug terminal.

[0004] To solve the above technical problems, the present application provides a terminal assembly, including a socket terminal and a plug terminal electrically in contact with the socket terminal, the plug terminal including a plug holding portion, a connecting portion extending backward from the plug holding portion, and a plug contact portion formed by vertically bending from the front end of the plug holding portion, the socket terminal including a socket holding portion, a welding foot extending forward from the socket holding portion, and a socket contact portion electrically in contact with the plug contact portion formed by vertically bending from the rear end of the socket holding portion, the socket contact portion and the plug contact portion are arranged face to face, the socket contact portion is provided with a contact groove in the vertical direction, the plug contact portion is provided with a contact ridge inserted into the contact groove in the vertical direction, and the contact ridge is electrically in contact with the contact groove in the lateral direction.

[0005] Preferably, the contact convex strip includes a convex end face and a convex side face, the contact groove includes a concave wall face and a concave side face, and the two convex side faces located on both lateral sides of the convex end face are in extrusion contact with the two concave side faces located on both lateral sides of the concave wall face.

[0006] Preferably, a convex rounded surface is provided at the junction of the protruding end face of the contact convex strip and the protruding side surface, an external contact portion is provided at the junction of the protruding side surface adjacent to the convex rounded surface, a concave rounded surface is formed at the junction of the outer end edge of the concave side surface of the contact groove and the surface of the socket contact portion, an internal contact portion is provided at the concave side surface adjacent to the concave rounded surface, and the contact convex strip and the contact groove are electrically connected through the contact between the external contact portion and the internal contact portion.

[0007] Preferably, the distance between the two outer contact portions is not less than the distance between the two inner contact portions.

[0008] Preferably, the socket contact portion corresponds to the plug contact portion in a front-to-rear direction, and there is a gap between the socket contact portion and the plug contact portion.

[0009] Preferably, the convex end surface and the concave wall surface do not contact each other, and a gap is formed between the convex end surface and the concave wall surface.

[0010] In order to solve the above technical problems, the present application also provides a board-to-board connector assembly, including a socket and a plug plugged into the socket, the socket including a socket body and a plurality of socket terminals formed in the socket body, the socket body including a body bottom plate, an outer wall extending upward from the outer circumference of the body bottom plate, a socket wall extending upward from the body bottom plate, and a docking space formed between the socket wall and the outer wall, the socket terminal including a socket contact portion formed on one side of the socket wall located at the docking space, the plug including a plug body and a plurality of plug terminals formed in the plug body, the plug body including a body base, the body base protruding downward to form a plug wall, the plug terminal including a plug contact portion formed on the plug wall, the socket contact portion and the plug contact portion are arranged face to face, the socket contact portion is provided with a contact groove in the vertical direction, the plug contact portion is provided with a contact convex strip inserted into the contact groove in the vertical direction, and the contact convex strip is electrically in contact with the contact groove in the lateral direction.

[0011] Preferably, the contact convex strip includes a convex end face and a convex side face, the contact groove includes a concave wall face and a concave side face, and the two convex side faces located on both lateral sides of the convex end face are in extrusion contact with the two concave side faces located on both lateral sides of the concave wall face.

[0012] Preferably, a convex rounded surface is provided at the junction of the protruding end face of the contact convex strip and the protruding side surface, an external contact portion is provided at the junction of the protruding side surface adjacent to the convex rounded surface, a concave rounded surface is formed at the junction of the outer end edge of the concave side surface of the contact groove and the surface of the socket contact portion, an internal contact portion is provided at the concave side surface adjacent to the concave rounded surface, and the contact convex strip and the contact groove are electrically connected through the contact between the external contact portion and the internal contact portion.

[0013] Preferably, the socket contact portion corresponds to the plug contact portion in the front-to-back direction, and there is a gap between the socket contact portion and the plug contact portion; the protruding end surface and the concave wall surface do not contact each other, and a gap is formed between the protruding end surface and the concave wall surface.

[0014] Preferably, the socket wall is formed with socket terminal grooves on both sides in the longitudinal direction, and the socket terminal grooves extend out of the outer wall along the upper surface of the bottom plate of the main body, and the socket terminal includes a socket holding portion, a welding foot extending forward from the socket holding portion to the outside of the socket body, and the socket contact portion formed by vertically bending from the rear end of the socket holding portion, and the socket contact portion includes a first socket vertical wall provided with the contact groove and a second socket vertical wall formed by reversely bending from the first socket vertical wall, and the first and second socket vertical walls are respectively formed on both sides in the longitudinal direction of the socket wall.

[0015] Preferably, the plug body also includes a tail portion formed at the rear end of the socket body, a step portion protruding downward from the socket body, and an insertion cavity located between the step portion and the plug wall, the plug wall is formed with plug terminal grooves on both longitudinal sides, the plug terminal grooves extend backward along the upper surface of the body base to the tail portion, the plug terminal includes a plug holding portion, a connecting portion extending from the rear end of the plug holding portion to the tail portion, and the plug contact portion formed by vertically bending from the plug holding portion, the plug contact portion includes the first plug vertical wall provided with the contact convex strip and the second plug vertical wall formed by reversely bending from the first plug vertical wall, the first and second plug vertical walls are respectively formed on both longitudinal sides of the plug wall.

[0016] Preferably, the tail portion has both sides extending backwards to form matching arms, the tail portion is provided with a terminal block and a spacer block separating the terminal blocks, the plug terminal includes a signal terminal and a grounding terminal separating the signal terminals, the connecting portion of the signal terminal extends above the terminal block, the connecting portion of the grounding terminal extends backwards out of the tail portion, and the spacer block is crimped above the grounding terminal.

[0017] The terminal assembly and board-to-board connector assembly of the present application are configured such that a contact groove is provided on the socket contact portion of the socket terminal, and a contact ridge matching the contact groove is provided on the plug contact portion of the plug terminal. The convex side surface of the contact ridge is squeezed and electrically contacted with the concave side surface of the contact groove in the transverse direction, thereby avoiding the defect in the prior art that at least one contact spring arm in the longitudinal direction needs to be provided on the plug or the socket, which results in excessive difficulty in injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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:

[0019] Figure 1 A three-dimensional assembly diagram of a board-to-board connector assembly of the present application;

[0020] Figure 2 A three-dimensional diagram of a board-to-board plug of the present application;

[0021] Figure 3 A three-dimensional diagram of a plug body of a board-to-board plug of the present application;

[0022] Figure 4 A three-dimensional diagram of a plug terminal of the terminal assembly of the present application;

[0023] Figure 5 For along Figure 4 A cross-sectional view taken along the dashed line BB shown;

[0024] Figure 6 For along Figure 2 A cross-sectional view taken along the dashed line AA shown;

[0025] Figure 7 A three-dimensional diagram of the board-to-board socket of this application;

[0026] Figure 8 A three-dimensional diagram of a socket body of the board-to-board socket of the present application;

[0027] Fig. 9 A three-dimensional diagram of a socket terminal of the terminal assembly of the present application;

[0028] Fig.10 For along Fig. 9 A cross-sectional view of the dashed line DD shown;

[0029] Fig.11 For along Figure 7 A cross-sectional view of the CC dashed line shown;

[0030] Fig.12 This is a schematic diagram of electrical contact between the socket terminals and the plug terminals of the board-to-board connector assembly of the present application.

[0031] Main component symbols

[0032] Board-to-board plug-A; plug body-20; body base-21; card block-211; tail-22; terminal block-221; spacer block-222; matching arm-23; step portion-24; inner recess-25; plug wall-26; outer reinforcement portion-265; plug cavity-27; spacer block-28; plug terminal-40; signal terminal-41; ground terminal-42; plug retaining portion-43; plug contact portion-44; first plug vertical wall-441, second plug vertical wall 442; plug jumper portion-443; connecting portion-45; contact convex strip-46; protruding end surface-461; protruding Rounded surface-462; external contact portion 463; protruding side surface-464; board-to-board socket-B; socket body-60; body bottom plate-61; front outer wall-62; side outer wall-63; socket wall-64; docking space-67; notch-68; socket terminal-70; socket retaining portion-71; welding foot-72; socket contact portion-73; first vertical wall of the socket-731; second vertical wall of the socket-732; socket jumper portion-733; contact groove-74; inner concave wall surface-741; inner concave rounded surface-742; inner contact portion-743; inner concave side surface-744; metal fixing part-80. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of this application clearer, the technical solution of this application will be clearly and completely described below in combination with the specific embodiments of this application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of this application, not all of them.

[0034] The definition of direction in this application is based on Figure 1 The X direction is the rear in the front-to-back direction (longitudinal direction), the Y direction is the right in the left-to-right direction (lateral direction), and the Z direction is the top in the up-down direction (vertical direction).

[0035] See also Figure 1 As shown, the board-to-board connector assembly of the present application includes a socket B and a plug A docked with the socket B.

[0036] See also Figure 2 ,to Figure 6 As shown, the board-to-board plug A of the present application includes a plug body 20, a plurality of plug terminals 40 formed in the plug body 20, a shielding shell (not shown) covering the outside of the plug body 20, and a coaxial line (not shown) connecting the plug terminals 40.

[0037] The plug body 20 includes a body base 21, a tail portion 22 formed at the rear end of the body base 21, and a matching arm 23 extending backward from both sides of the tail portion. The front end of the body base 21 protrudes downward to form a plug wall 26, and the body base 21 protrudes downward to form a step portion 24 at the rear end of the plug wall 26. A plug cavity 27 is formed between the step portion 24 and the plug wall 26. The lateral outer side of the tail portion 22 is recessed inward to form an inner concave portion 25. The lateral sides of the plug wall 26 are formed with outer reinforcement portions 265. The plug wall 26 is formed with a plurality of plug terminal slots 29, and the plug terminal slots 29 span the plug wall 26 and extend backward through the step portion 24 to the tail portion 22.

[0038] The tail portion 22 is provided with a plurality of terminal blocks 221 and a rear convex portion 222 separating the terminal blocks 221. The rear convex portion 222 extends backwards for a length greater than the extension length of the terminal block 221, and the plug terminal slot 29 extends from both the terminal block 221 and the rear convex portion 222. The rear end of the step portion 24 further extends backwards to form a spacer block 28 above the corresponding rear convex portion 222, and the spacer block 28 separates the terminal blocks 221. A clamp block 211 is further formed extending from the periphery of the body base 21.

[0039] The plug terminal 40 includes a plurality of signal terminals 41 and a plurality of grounding terminals 42 that separate the signal terminals 41 from each other. Each plug terminal 40 includes a plug retaining portion 43, a plug contact portion 44 extending from the front end of the plug retaining portion 43 and straddling the plug wall 26, and a connecting portion 45 extending backward from the plug retaining portion 43 to the tail portion 22. The connecting portion 45 of the signal terminal 41 extends to the terminal block 221 and is exposed on the upper surface of the terminal block 221 to be welded to the coaxial line. The connecting portion 45 of the grounding terminal 42 is bent upward and then extends backward to the rear end of the rear protrusion 222. The horizontal position of the connecting portion 45 of the grounding terminal 42 is higher than the horizontal position of the connecting portion 45 of the signal terminal 41. The plug contact portion 44 includes a first plug vertical wall 441 that is bent and extended vertically downward from the plug holding portion 43 and formed in the plug terminal slot 29 at the rear side of the plug wall 26, a second plug vertical wall 442 that is bent and extended from the bottom end of the first plug vertical wall 441 and formed in the plug terminal slot 29 at the front side of the plug wall 26, and a plug bridging portion 443 that spans and covers the top of the plug wall 26. The side of the first plug vertical wall 441 exposed from the plug cavity 27 is stamped with a contact convex strip 46 toward the plug cavity 27.

[0040] The contact convex strip 46 is formed on the first plug vertical wall 441 and extends in the vertical direction. The contact convex strip 46 includes a protruding end face 461, a protruding side face 464 connecting the protruding end face and the first plug vertical wall 441, a protruding rounded corner face 462 formed at the junction of the protruding end face 461 and the protruding side face 464, and an outer contact portion 463 located on the protruding side face 464 and adjacent to the protruding rounded corner face 462. The width between the two protruding rounded corner faces 462 is smaller than the width between the two outer contact portions 463.

[0041] In one embodiment, the second plug vertical wall 442 and the plug bridging portion 443 may be removed, and only the first plug vertical wall 441 may be retained.

[0042] The shielding shell and the coaxial line are not described in detail in this application document, and reference may be made to the specification and claims of the patent application document No. 201820584125.7 of the People's Republic of China.

[0043] The board-to-board plug A of the present application is suitable for transmitting low-frequency electrical signals, such as the connection between a mobile phone screen, a touch screen, etc. and a mainboard, and is also suitable for transmitting radio frequency signals, such as antenna signals, etc.

[0044] Please continue reading Figures 7 to 11 As shown, the board-to-board socket B includes a socket body 60 , socket terminals 70 formed in the socket body 60 , and metal fixing members 80 formed on both lateral sides of the socket body 60 .

[0045] The socket body 60 includes a body bottom plate 61, an outer peripheral wall extending upward from the outer periphery of the body bottom plate 61, a socket wall 64 extending upward from the middle of the body bottom plate 61, and a docking space 67 formed between the socket wall 64 and the outer peripheral wall. The outer peripheral wall includes a front outer peripheral wall 62 extending upward from the front end of the body bottom plate 61 and a side outer peripheral wall 63 extending upward from the lateral sides of the body bottom plate 61. A notch 68 is formed at the rear end of the body bottom plate 61 at the rear side of the socket wall 64. The socket wall 64 is provided with a plurality of socket terminal slots 69, which extend forward along the body floor 61 and out of the front outer peripheral wall 62.

[0046] The socket terminal 70 includes a socket holding portion 71, a welding foot 72 extending from the front end of the socket holding portion 71, and a socket contact portion 73 extending from the rear end of the socket holding portion 71 and formed on the socket wall 26. The socket contact portion 73 includes a first socket vertical wall 731 vertically bent upward from the rear end of the socket holding portion 71, a second socket vertical wall 732 bent backward from the top of the first socket vertical wall 731, and a socket bridging portion 733 connecting the tops of the first and second socket vertical walls 731, 732 and covering the top of the socket terminal wall 641. A contact groove 74 is stamped on the first socket vertical wall 731, and the contact groove 74 includes an inner concave wall surface 741 away from the docking space 67, an inner concave side surface 744, an inner rounded corner surface 742 formed at the junction of the inner concave side surface 744 and the first socket vertical wall 731, and an inner contact portion 743 formed on the inner concave side surface 744 adjacent to the inner concave rounded corner surface 742.

[0047] The distance between the two inner rounded corner surfaces 742 is smaller than the distance between the two inner contact portions 743 .

[0048] The socket terminal 70 is formed in the socket body 60 , the socket holding portion 71 is formed in the body bottom plate 61 , and the welding foot 72 extends forward from the lower surface of the front peripheral wall 62 . The socket contact portion 73 is formed outside the socket wall 64 .

[0049] In one embodiment, the second socket vertical wall 732 and the socket bridging portion 733 may be removed, and only the first socket vertical wall 731 may be retained.

[0050] The metal fixing member 80 is integrally formed on the side peripheral wall 63 of the socket body 60 and is welded and fixed to the printed circuit board.

[0051] The board-to-board socket B of the present application is suitable for transmitting low-frequency electrical signals, such as the connection between a mobile phone screen, a touch screen, etc. and a motherboard, and is also suitable for transmitting radio frequency signals, such as antenna signals, etc.

[0052] See also Figures 1 to 12 As shown, see Fig.12As shown, when the plug A is inserted into the socket B, the socket wall 64 is inserted into the insertion cavity 27 of the plug A, the outer reinforcement portion 265 of the plug A is inserted into the docking space 67 of the socket B to limit the position, and the step portion 24 is accommodated in the notch 68. The plug wall 26 is in close contact with the socket wall 64 in the longitudinal direction, the contact ridge 46 of the plug A is inserted into the contact groove 74 of the socket B, and the outer contact portion 463 of the contact ridge 46 is in close contact with the inner contact portion 743 of the contact groove 74 to achieve electrical connection, so as to achieve the extrusion contact between the plug terminal 40 and the socket terminal 70 in the transverse direction, without the need to set an elastic contact structure in the longitudinal direction.

[0053] The inner rounded corner surface 742 and the outer rounded corner surface 462 are offset to avoid contact interference in an incorrect position. The distance between the two inner contact parts 743 is not less than the distance between the two outer contact parts 463 to ensure interference contact between the two. There is a gap between the protruding end surface 461 and the inner concave wall surface 741 without contact and interference with each other, and there is a gap between the first socket vertical wall 731 and the first plug vertical wall 441. Through the setting of the above gap, the electrical contact between the plug terminal 40 and the socket terminal 70 is only achieved by the extrusion of the inner contact part 743 and the outer contact part 463 in the lateral direction. When the size of the plug and socket terminals 40, 70 is very small, it is ensured that the extrusion contact between the inner contact part 743 and the outer contact part 463 in the lateral direction will not be interfered by the other parts due to precision misinsertion.

[0054] The contact ridge 46 of the plug terminal 40 and the contact groove 74 of the socket terminal 70 are interchangeable, that is, the contact groove may be provided on the plug terminal 40, and the contact ridge may be provided on the socket terminal 70. At the same time, the definition of the plug or the socket in this case is interchangeable, and it is not absolutely considered that the part currently connected to the coaxial line is a plug, it can also be said to be a socket.

[0055] The terminal assembly and board-to-board connector assembly of the present application are provided with a contact groove 74 on the socket contact portion 73 of the socket terminal 70, and a contact ridge 46 matching the contact groove 74 is provided on the plug contact portion 44 of the plug terminal 40. The protruding side surface 464 of the contact ridge 46 is squeezed and electrically contacted with the concave side surface 744 of the contact groove 74 in the lateral direction, thereby avoiding the defect in the prior art that at least one contact spring arm in the longitudinal direction needs to be provided on the plug or socket, which makes injection molding too difficult.

[0056] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A terminal assembly, comprising a socket terminal and a plug terminal electrically contacting the socket terminal, wherein the plug terminal comprises a plug holding portion, a connecting portion extending rearward from the plug holding portion, and a plug contact portion vertically bent from the front end of the plug holding portion, wherein the socket terminal comprises a socket holding portion, a welding foot extending forward from the socket holding portion, and a socket contact portion electrically contacting the plug contact portion vertically bent from the rear end of the socket holding portion, wherein the socket contact portion and the plug contact portion are arranged face to face, and wherein: The socket contact portion is provided with a contact groove in the vertical direction, and the plug contact portion is provided with a contact convex strip inserted into the contact groove in the vertical direction; The contact convex strip includes a convex end surface and a convex side surface, and the contact groove includes a concave wall surface and a concave side surface, and the two convex side surfaces located on the lateral sides of the convex end surface are in extrusion contact with the two concave side surfaces located on the lateral sides of the concave wall surface; A convex rounded surface is provided at the junction of the convex end surface of the contact convex strip and the convex side surface, an outer contact portion is provided at the convex side surface adjacent to the convex rounded surface, an inner concave rounded surface is formed at the junction of the outer end edge of the inner concave side surface of the contact groove and the surface of the socket contact portion, an inner contact portion is provided at the inner concave side surface adjacent to the inner concave rounded surface, and the outer contact portion contacts the inner contact portion; The contact protrusion is in electrical contact with the contact groove in a lateral direction.

2. The terminal assembly according to claim 1, characterized in that The distance between the two outer contact portions is not less than the distance between the two inner contact portions.

3. The terminal assembly according to claim 1, characterized in that The socket contact portion corresponds to the plug contact portion in the front-rear direction, and there is a gap between the socket contact portion and the plug contact portion.

4. The terminal assembly according to claim 1, characterized in that The convex end surface and the concave wall surface do not contact each other, and a gap is formed between the convex end surface and the concave wall surface.

5. A board-to-board connector assembly, comprising a socket and a plug plugged into the socket, the socket comprising a socket body and a plurality of socket terminals formed in the socket body, the socket body comprising a body bottom plate, an outer peripheral wall extending upward from the outer circumference of the body bottom plate, a socket wall extending upward from the body bottom plate, and a docking space formed between the socket wall and the outer peripheral wall, the socket terminal comprising a socket contact portion formed on one side of the socket wall located at the docking space, the plug comprising a plug body and a plurality of plug terminals formed in the plug body, the plug body comprising a body base, the body base protruding downward to form a plug wall, the plug terminal comprising a plug contact portion formed on the plug wall, characterized in that The socket contact portion and the plug contact portion are arranged face to face, the socket contact portion is provided with a contact groove in the vertical direction, and the plug contact portion is provided with a contact convex strip inserted into the contact groove in the vertical direction, and the contact convex strip is in electrical contact with the contact groove in the lateral direction.

6. The board-to-board connector assembly according to claim 5, wherein: The contact convex strip includes a convex end face and a convex side face, the contact groove includes a concave wall face and a concave side face, and the two convex side faces located on the lateral sides of the convex end face are in extrusion contact with the two concave side faces located on the lateral sides of the concave wall face.

7. The board-to-board connector assembly according to claim 6, wherein: A convex rounded surface is provided at the junction of the convex end surface of the contact convex strip and the convex side surface, an external contact portion is provided at the convex side surface adjacent to the convex rounded surface, a concave rounded surface is formed at the junction of the outer end edge of the concave side surface of the contact groove and the surface of the socket contact portion, an internal contact portion is provided at the concave side surface adjacent to the concave rounded surface, and the contact convex strip and the contact groove are electrically connected through the contact between the external contact portion and the internal contact portion.

8. The board-to-board connector assembly according to claim 7, wherein: The socket contact portion corresponds to the plug contact portion in the front-to-back direction, and there is a gap between the socket contact portion and the plug contact portion; the protruding end surface and the concave wall surface do not contact each other, and a gap is formed between the protruding end surface and the concave wall surface.

9. The board-to-board connector assembly according to claim 7, wherein: The socket wall is formed with socket terminal grooves on both sides in the longitudinal direction, and the socket terminal grooves extend out of the outer wall along the upper surface of the bottom plate of the main body. The socket terminal includes a socket holding portion, a welding foot extending forward from the socket holding portion to the outside of the socket body, and the socket contact portion formed by vertical bending from the rear end of the socket holding portion. The socket contact portion includes a first socket vertical wall provided with the contact groove and a second socket vertical wall formed by reverse bending from the first socket vertical wall. The first and second socket vertical walls are respectively formed on both sides in the longitudinal direction of the socket wall.

10. The board-to-board connector assembly according to claim 9, wherein: The plug body also includes a tail portion formed at the rear end of the socket body, a step portion protruding downward from the socket body, and an insertion cavity located between the step portion and the plug wall. The plug wall is formed with plug terminal grooves on both longitudinal sides, and the plug terminal grooves extend backward along the upper surface of the body base to the tail portion. The plug terminal includes a plug holding portion, a connecting portion extending from the rear end of the plug holding portion to the tail portion, and the plug contact portion formed by vertically bending from the plug holding portion. The plug contact portion includes a first plug vertical wall provided with the contact convex strip and a second plug vertical wall formed by reversely bending from the first plug vertical wall. The first and second plug vertical walls are respectively formed on both longitudinal sides of the plug wall.

11. The board-to-board connector assembly according to claim 10, wherein: The tail portion has two lateral sides extending backward to form a matching arm, the tail portion is provided with a terminal block and a spacer block separating the terminal blocks, the plug terminal includes a signal terminal and a grounding terminal separating the signal terminals, the connecting portion of the signal terminal extends above the terminal block, the connecting portion of the grounding terminal extends backward out of the tail portion, and the spacer block is crimped above the grounding terminal.

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