CN211579028U - Board-to-board socket, plug and connector assembly - Google Patents

Abstract

A board-to-board socket comprises a socket body and a socket terminal formed in the socket body, the socket body comprises a body bottom plate and a socket wall body formed by extending upwards from the body bottom plate, the socket terminal comprises a socket fixing part formed in the bottom plate of the body, a welding leg formed by extending from the front end of the socket fixing part and a socket contact part formed on the wall of the socket and extending from the rear end of the socket fixing part, the socket wall body includes socket terminal walls forming the socket contact portions and socket partition walls partitioning the socket terminal walls, the socket contact part comprises a first socket vertical wall which is vertically bent from the socket fixing part and is formed on one side of the socket terminal wall close to the butt joint space, the thickness of the socket terminal wall and the socket contact part is larger than that of the socket partition wall. The application also provides a plug and board-to-board connector assembly.

Description

Board-to-board socket, plug and connector assembly

Technical Field

The present application relates to the field of board-to-board connectors, and more particularly, to a board-to-board socket, plug, and connector assembly.

Background

The patent 201820584125.7 of the people's republic of china discloses a board-to-board plug, a socket and a connector assembly, wherein the plug comprises a plug body, a plug terminal formed in the plug body and a shielding shell coated outside the plug body, the plug terminal comprises a fixing part formed in the plug body, a welding pin and a contact elastic arm respectively formed by extending from two ends of the fixing part, and an elastic space for the contact elastic arm to deform is formed on the periphery of the plug body, namely an escape part is formed on the periphery of the contact elastic arm; at injection moulding the plug terminal with during the plug body, because board to board connector size is more and more little, the structure is also more and more meticulous, for example 0.35m terminal interval, group and highly be 0.8mm to the board plug, and contact still need form the baffle between the bullet arm, deduct baffle size and clearance, the thickness that is used for the location to be formed with the mould part of keeping away the vacancy portion is only 0.045mm, the precision requirement to terminal stamping process, injection moulding process is very high, domestic the overwhelming majority producer is difficult to realize, a small number of foreign manufacturers can realize, but the cost is very high.

SUMMERY OF THE UTILITY MODEL

Accordingly, there is a need for a board-to-board socket, a plug and a connector assembly, which can achieve a pressing space required for contact between a plug terminal and a socket terminal by deformation of a terminal wall through the provision of a plastic terminal wall having a certain elasticity, without providing a contact spring arm on the plug or the socket terminal.

In order to solve the technical problem, the application provides a board to board socket, including socket ontology, shaping in socket terminal in the socket ontology and shaping in socket ontology outlying metal mounting, socket ontology includes the body bottom plate, from the body bottom plate periphery upwards extends the peripheral wall that forms, from the body bottom plate upwards extends the socket wall that forms and form in socket wall with butt joint space between the peripheral wall, socket terminal including the shaping in the body bottom plate socket fixing portion, from socket fixing portion front end extends the leg that forms and from socket fixing portion rear end extends and the shaping in socket contact site on the socket wall, socket wall includes the shaping socket terminal wall of socket contact site and will socket terminal wall spaced apart socket partition wall, socket contact site include from socket fixing portion bend perpendicularly and form in socket terminal wall is close to socket contact site And the overlapping thickness of the socket terminal wall and the socket contact part is greater than that of the socket partition wall.

Preferably, the receptacle partition wall is provided with second cut-outs at longitudinal front or/and rear sides, the second cut-outs reducing the thickness of the receptacle partition wall.

Preferably, the socket terminal wall is provided with a socket terminal groove at one side of the docking space, the socket terminal groove extends out of the peripheral wall along the upper surface of the body bottom plate, and the first socket vertical wall is formed in the socket terminal groove of the socket terminal wall.

Preferably, the socket terminal wall is formed with socket terminal grooves on both sides in the longitudinal direction, the socket terminal grooves extend out of the peripheral wall along the upper surface of the body bottom plate, the socket terminal further includes a second socket vertical wall formed by bending the first socket vertical wall in the opposite direction, and the first and second socket vertical walls are respectively formed in the socket terminal grooves on both sides of the front and rear of the socket terminal wall.

Preferably, the socket terminal further includes a socket bridging portion connected to the vertical walls of the first and second sockets, the socket bridging portion covers the top end of the socket terminal slot, the peripheral wall includes a front peripheral wall formed by upward extending the front end of the body base plate, and a side peripheral wall formed by upward extending the two lateral sides of the body base plate, a notch is formed at the rear end of the body base plate along the wall of the socket, and the metal fixing member is integrally formed on the side peripheral wall.

For solving the technical problem, this application still provides a board is to board plug, including plug body, shaping in this internal a plurality of plug terminals of plug and cladding in this external shielded enclosure of plug, the plug body include the body base and form in the afterbody of body base rear end, both ends downward protrusion is formed with plug wall body and step portion respectively around the body base, step portion with be formed with the grafting chamber between the plug wall body, plug terminal include plug holding portion, certainly plug contact portion that the preceding extension of plug holding portion formed and certainly plug holding portion back extend to connecting portion on the afterbody, plug wall body is including the shaping plug terminal wall and the interval of plug contact portion plug terminal wall, plug contact portion include certainly plug holding portion bend perpendicularly form and shaping in plug terminal wall is located the first plug of grafting chamber one side is inserted And the overlapping thickness of the plug terminal wall and the socket contact part is greater than that of the plug partition wall.

Preferably, the plug partition wall is provided with first cutouts at longitudinal front or/and rear sides, the first cutouts reducing the thickness of the receptacle partition wall.

Preferably, the plug terminal wall is provided with a plug terminal groove at one side of the plugging cavity, the plug terminal groove extends backwards to the tail part along the upper surface of the body base, and the first plug vertical wall is formed in the plug terminal groove of the plug terminal wall.

Preferably, plug terminal grooves are formed in the plug terminal walls on two longitudinal sides, the plug terminal grooves extend to the tail portion along the upper surface of the body base, the plug terminal further comprises a second plug vertical wall formed by reversely bending the first plug vertical wall, and the first plug vertical wall and the second plug vertical wall are formed in the plug terminal grooves in the front side and the rear side of the plug terminal walls respectively.

Preferably, the plug terminal further includes a socket bridging portion connecting the first and second plug vertical walls, and the socket bridging portion covers the top end of the plug terminal groove.

Preferably, the lateral two sides of the tail portion extend backwards to form a matching arm, the tail portion is provided with a terminal block and a spacing block for spacing the terminal block, the plug terminal comprises a signal terminal and a grounding terminal for spacing the signal terminal, a connecting portion of the signal terminal extends to the upper side of the terminal block, a connecting portion of the grounding terminal extends backwards to the upper side of the tail portion, and the spacing block is in press-connection with the upper side of the grounding terminal.

Preferably, the first plug vertical wall is stamped with a contact convex hull towards the plugging space.

In order to solve the above technical problem, the present application further provides a board-to-board connector assembly, including a socket and a plug connected with the socket, wherein the socket includes a socket body and a plurality of socket terminals formed in the socket body, the socket body includes a body bottom plate, a peripheral wall formed by extending upwards from the periphery of the body bottom plate, a socket wall formed by extending upwards from the body bottom plate and a docking space formed between the socket wall and the peripheral wall, the socket terminal includes a socket contact portion formed on one side of the socket wall located in the docking space, the plug includes a plug body and a plurality of plug terminals formed in the plug body, the plug body includes a body base, the body base protrudes downwards to form a plug wall, the plug terminals include plug contact portions formed on the plug wall, the plug wall body comprises a plug terminal wall for forming the plug contact part and a plug partition wall for partitioning the plug terminal wall, the socket wall body comprises a socket terminal wall for forming the socket contact part and a socket partition wall for partitioning the socket terminal wall, the plug wall body and the plug contact part are inserted into the butt joint space to be in butt joint with the socket wall body and the socket contact part, and the plug contact part and the socket contact part mutually press and electrically contact and enable the plug wall body and the socket wall body to elastically deform in the opposite direction.

Preferably, a contact convex hull is formed on the plug contact part or the socket contact part in a stamping mode, and the contact convex hull is used for pressing and electrically contacting.

Preferably, the plug partition wall is provided with a first cut-out portion at a longitudinal front side or/and a longitudinal rear side, the socket partition wall is provided with a second cut-out portion at a longitudinal front side or/and a longitudinal rear side, a stacking thickness of the plug terminal wall and the socket contact portion is greater than a thickness of the plug partition wall, and a stacking thickness of the socket terminal wall and the socket contact portion is greater than a thickness of the socket partition wall.

This application board is to the board plug through set up the shaping on the plug body the plug wall body of the plug contact portion of plug terminal, and the preceding or rear side of the mutual plug partition wall of plug terminal sets up first excision in order to reduce the rigidity of plug wall body, and make the plug wall body possesses certain elastic force on longitudinal direction. This application board is to socket through set up the shaping on socket ontology the socket wall body of the socket contact portion of socket terminal, and socket terminal is socket partition wall's between each other preceding or rear side set up the second excision with the reduction socket wall's rigidity, and make socket wall body possesses certain elastic force in longitudinal direction, need set up a contact elastic arm at least and lead to the too big defect of the injection moulding degree of difficulty among the avoiding prior art on plug or socket.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a perspective assembly view of a board-to-board connector assembly according to the present application;

FIG. 2 is a perspective view of a board-to-board plug of the present application;

fig. 3 is a perspective view of a plug body of the board-to-board plug of the present application and a partially enlarged view thereof;

fig. 4 is a perspective view of the plug terminal of the plate-to-plate plug of the present application;

FIG. 5 is a cross-sectional view of the plate-to-plate plug of the present application taken along the length of the plug terminals;

fig. 6 is a cross-sectional view of the board-to-board plug of the present application in a front-to-rear direction along a position between two plug terminals;

FIG. 7 is a perspective view of a board-to-board socket of the present application;

fig. 8 is a perspective view of a socket body of the board-to-board socket of the present application and a partially enlarged view thereof;

FIG. 9 is a cross-sectional view of the board-to-board socket of the present application taken along the location of the socket terminals;

FIG. 10 is a cross-sectional view of the board-to-board socket of the present application taken along a location between the two socket terminals;

fig. 11 is a sectional view taken along the broken line a-a shown in fig. 1.

Description of the main Components

A board-to-board plug-a; a plug body-20; a body base-21; a fixture block-211; tail-22; a terminal block-221; a spacer-222; a mating arm-23; a step-24; an inner recess-25; a plug wall-26; plug terminal wall-261; plug terminal slot-262; plug partition-263; a first cut-out-264; an outboard reinforcement-265; a plug cavity-27; a spacer-28; a plug terminal-40; a signal terminal-41; a ground terminal-42; a plug holding portion-43; a plug contact-44; a first plug vertical wall-441, a second plug vertical wall 442; a plug bridge-443; contact convex hull-444; connecting part-45; board-to-board socket-B; a socket body-60; a body floor-61; a front peripheral wall-62; a side peripheral wall-63; a socket wall-64; receptacle terminal wall-641; socket terminal slots-642; receptacle partition-643; a second cut-out-644; docking space-67; notch-68; a socket terminal-70; a socket holding portion-71; a solder tail-72; socket contact-73; a first vertical wall-731 of the receptacle; a second receptacle vertical wall-732; a socket bridge-733; metal fixing piece-80.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments.

The definition of the direction in the present application is based on fig. 1, and the X direction is the rear of the front-rear direction (longitudinal direction), the Y direction is the right of the left-right direction (lateral direction), and the Z direction is the upper of the up-down direction (vertical direction).

Referring to fig. 1, the board-to-board connector assembly of the present application includes a socket B and a plug a mated with the socket B.

Referring to fig. 2 to 6, the plate-to-plate 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 plug body 20, and a coaxial line (not shown) connecting the plug terminals 40.

The plug body 20 includes a body base 21, a tail portion 22 formed at the rear end of the body base 21, and mating arms 23 extending rearward from the two lateral sides of the tail portion. The front end of the body base 21 protrudes downwards to form a plug wall 26, the rear end of the body base 21 protruding downwards to form a step portion 24, an insertion cavity 27 is formed between the step portion 24 and the plug wall 26, and the transverse outer side of the tail portion 22 is recessed inwards to form an inner concave portion 25. The plug wall 26 includes plug terminal walls 261, plug partition walls 263 partitioning the plug terminal walls 261, plug terminal grooves 262 formed at front and rear sides of the plug terminal walls 261, first cut-away portions 264 formed by cutting away front end portions of the plug partition walls 263, and outer side reinforcing portions 265 formed at both lateral sides of the plug wall 26.

The first cut portion 264 is provided at the front side of the plug partition wall 263 to reduce the thickness of the plug partition wall 263, so that the plug partition wall 263 has a good elastic performance in a longitudinal direction.

The plug terminal slots 262 span the top of the plug terminal wall 261, with the plug terminal slots 262 extending rearward onto the tail 22. The tail portion 22 is provided with a plurality of terminal blocks 221 and rear protrusions 222 for spacing the terminal blocks 221 apart. The rear protrusion 222 extends rearward longer than the terminal block 221, and the plug terminal groove 262 extends from both the terminal block 221 and the rear protrusion 222. The rear end of the step portion 24 is further extended rearward above the corresponding rear protrusion 222 to form a spacer 28, and the terminal block 221 is spaced apart by the spacer 28. The periphery of the body base 21 is also extended to form a latch 211.

The plug terminals 40 include signal terminals 41 and ground terminals 42 that space the signal terminals 41 apart from each other, each plug terminal including a plug holding portion 43, a plug contact portion 44 extending from a front end of the plug holding portion 43 and straddling the plug terminal wall 261, and a connecting portion 45 extending from the plug holding portion 43 rearward to the tail portion 22. The connecting portion 45 of the signal terminal 41 extends to the terminal block 221 and is exposed to the upper surface of the terminal block 221 to be soldered to the coaxial line. The connecting portion 45 of the ground terminal 42 is bent upward and then extends rearward beyond the rear end of the rear protrusion 222. The horizontal position of the connection portion 45 of the ground terminal 42 is higher than that of the connection portion 45 of the signal terminal 41. The plug contact portion 44 includes a first plug vertical wall 441 bent and extended vertically downward from the plug holding portion 43 and formed in the plug terminal groove 262 at the rear side of the plug terminal wall 261, a second plug vertical wall 442 bent and extended reversely from the lower end of the first plug vertical wall 441 and formed in the plug terminal groove 262 at the front side of the plug terminal wall 261, and a plug bridging portion 443 bridging and covering the top end of the plug terminal wall 261. The side of the first plug vertical wall 441 exposed out of the plugging cavity 27 is provided with a contact convex hull 444.

When the plug terminal 40 is molded on the plug body 20, the thickness of the first and second plug vertical walls 441, 442 of the plug terminal 40 and the superimposed thickness of the plug terminal wall 261 sandwiched between the first and second plug vertical walls 441, 442 are larger than the thickness of the plug partition wall 263. The plug partition wall 263 is located at the rear side of the plug cavity 27 and at the same level as the rear side of the first plug vertical wall 441, and the contact protrusion protrudes backward from the first plug vertical wall 441 and is located in the plug cavity 27. The bottom surface of the plug bridging portion 443 of the plug terminal 40 is flush with the bottom surface of the plug partition wall 263, i.e., the bottom surface of the plug partition wall 263 is lower than the bottom surface of the plug terminal wall 261.

In one embodiment, the second plug vertical wall 442 and the plug bridge 443 may be eliminated, leaving only the first plug vertical wall 441.

The shielding shell and the coaxial cable are not repeated in this application document, and reference may be made to the specification and claims of the patent application document No. 201820584125.7 of the republic of china.

This application board is applicable to the transmission low frequency signal of telecommunication to board plug A, like being connected with the mainboard such as cell-phone screen, touch screen, also is applicable to the transmission radio frequency signal, like antenna signal etc..

The first cut-out portions 264 may be disposed at the rear side of the plug partition wall 263, or the first cut-out portions may be disposed at the front and rear sides of the plug partition wall 263, or the plug partition wall 263 may be eliminated, but the elimination of the plug partition wall 263 is not optimal, which may cause imbalance in the elastic force of each plug terminal 40 and the plug terminal wall 261 thereof.

This application board is to board plug A through set up the shaping on plug body 20 plug wall 26 of plug contact portion 44 of plug terminal 40, and plug terminal 40 sets up first excision 264 in order to reduce before or the rear side of plug partition wall 263 each other plug wall 26's rigidity, and makes plug wall 26 possesses certain elastic force on longitudinal direction, avoids prior art need set up the contact elastic arm and leads to the too big defect of injection moulding degree of difficulty.

Referring to fig. 7 to 10, the board-to-board socket B of the present invention includes a socket body 60, socket terminals 70 formed in the socket body 60, and metal fixing members 80 formed on two lateral sides of the socket body 60.

The socket body 60 includes a body bottom plate 61, a peripheral wall formed to extend upward from the outer periphery of the body bottom plate 61, a socket wall 64 formed to extend upward from the middle of the body bottom plate 61, and a docking space 67 formed between the socket wall 64 and the peripheral wall. The peripheral walls include a front peripheral wall 62 formed to extend upward from the front end of the body base plate 61 and side peripheral walls 63 formed to extend upward from both lateral sides of the body base plate 61. The rear end of the body base plate 61 forms a notch 68 at the rear side of the receptacle wall 64.

The receptacle wall 64 includes receptacle terminal walls 641 and receptacle partition walls 643 separating the receptacle terminal walls 641. Socket terminal grooves 642 are formed in the front and rear sides of the socket terminal wall 641, and the socket terminal grooves 642 extend to the outside of the socket body 60. A second cut-out 644 is provided at a front side of the receptacle partition wall 643 to reduce a thickness of the receptacle partition wall 643 and increase elasticity of the receptacle wall 64 in a longitudinal direction.

The socket terminal 70 includes a socket holding portion 71, a solder leg 72 formed by extending from the front end of the socket holding portion 71, and a socket contact portion 73 formed by extending from the rear end of the socket holding portion 71 and formed on the socket terminal wall 641. The socket contact portion 73 includes a first socket vertical wall 731 formed by bending upward and vertically from the rear end of the socket holding portion 71, a second socket vertical wall 732 formed by bending and extending from the top end of the first socket vertical wall 731 in the opposite direction, and a socket bridging portion 733 connecting the top ends of the first and second socket vertical walls 731, 732 and covering the top end of the socket terminal wall 641.

The socket terminals 70 are formed in the socket body 60, the holding portions 71 are formed in the body bottom plate 61, and the solder tails 72 extend forwardly beyond the lower surface of the front peripheral wall 62. The socket contact portions 73 are formed outside the socket wall 64. The thicknesses of the first and second receptacle vertical walls 731, 732 of the receptacle terminal 70 and the thickness of the stack of the receptacle terminal walls 641 sandwiched between the first and second receptacle vertical walls 731, 732 are greater than the thickness of the receptacle partition wall 643. The receptacle partition wall 643 is located at a side of the notch 68 and is located at the same level with the rear side of the second receptacle vertical wall 732.

In one embodiment, the second socket riser 732 and the socket bridge 733 may be eliminated, leaving only the first socket riser 731.

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

This application board is applicable to the transmission low frequency signal of telecommunication to board socket B, like being connected with the mainboard such as cell-phone screen, touch screen, also is applicable to the transmission radio frequency signal, like antenna signal etc..

The second cut-out 644 may be provided at a rear side of the receptacle partition wall 643, or the second cut-out 644 may be provided at front and rear sides of the receptacle partition wall 643, or the receptacle partition wall 643 may be eliminated.

In the board-to-board socket B of the present application, the socket wall 64 for forming the socket contact portion 73 of the socket terminal 70 is disposed on the socket body 60, and the second cut-out portion 644 is disposed on the front or rear side of the socket partition wall 643 between the socket terminals 70, so as to reduce the rigidity of the socket wall 64, and enable the socket wall 64 to have a certain elastic force in the longitudinal direction, thereby avoiding the defect of the prior art that the difficulty of injection molding is too large due to the need of at least one contact elastic arm disposed on the plug or the socket.

Referring to fig. 1 to 11, it is emphasized that, referring to fig. 11, 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 part 265 of the plug a is inserted into the abutting space 67 of the socket B for limiting, and the step part 24 is accommodated in the gap 68. The plug wall 26 is in close contact with the receptacle wall 64 in the longitudinal direction, and the contact convex hull 444 on the first plug vertical wall 441 presses the first receptacle vertical wall 731 backwards and forces the plug wall 26 and the receptacle wall 64 to generate opposite elastic deformation, the deformation amount of the elastic deformation is very weak, and only the thickness of the contact convex hull 444 needs to be reached, namely the deformation amount needs to be determined by the thickness of the contact convex hull 444.

The contact projections 444 of the plug terminals 40 may also be provided on the receptacle terminals 70. Meanwhile, the definition of the plug or the socket in the present case is interchangeable, and the part to which the coaxial line is currently connected is not absolutely considered to be the plug, but may be the socket.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. 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 (15)

1. A board-to-board socket comprises a socket body, socket terminals formed in the socket body and metal fixing pieces formed on the periphery of the socket body, wherein the socket body comprises a body bottom plate, a peripheral wall formed by upwards extending the periphery of the body bottom plate, a socket wall formed by upwards extending the body bottom plate and a butt joint space formed between the socket wall and the peripheral wall, the socket terminals comprise socket fixing parts formed in the body bottom plate, welding feet formed by extending the front ends of the socket fixing parts and socket contact parts formed on the socket wall by extending the rear ends of the socket fixing parts, the socket-to-board socket is characterized in that the socket wall comprises socket terminal walls forming the socket contact parts and socket partition walls separating the socket terminal walls, and the socket contact parts comprise first socket partition walls vertically bent from the socket fixing parts and formed on one sides of the socket terminal walls close to the butt joint space And the overlapped thickness of the socket terminal wall and the socket contact part is greater than that of the socket partition wall.

2. A board-to-board socket according to claim 1, wherein the socket partition wall is provided with a second cut-out portion at a longitudinal front or/and rear side, the second cut-out portion reducing the thickness of the socket partition wall.

3. The board-to-board socket of claim 2 wherein said socket terminal wall is provided with a socket terminal groove at a side thereof located in said mating space, said socket terminal groove extending along said body bottom plate upper surface beyond said peripheral wall, said first socket vertical wall being formed in said socket terminal groove of said socket terminal wall.

4. The board-to-board socket of claim 2, wherein said socket terminal walls are formed with socket terminal grooves at both longitudinal sides, said socket terminal grooves extending outside said peripheral wall along said body bottom plate upper surface, said socket terminal further comprising second socket vertical walls formed by bending said first socket vertical walls in opposite directions, said first and second socket vertical walls being formed in said socket terminal grooves at both front and rear sides of said socket terminal walls, respectively.

5. The board-to-board socket of claim 4, wherein said socket terminal further includes a socket bridging portion connecting said first and second socket vertical walls, said socket bridging portion covering the top end of said socket terminal slot, said peripheral wall including a front peripheral wall extending upwardly from the front end of said body base plate and forming side peripheral walls extending upwardly from both lateral sides of said body base plate, said body base plate rear end being formed with a notch along said socket wall, said metal fixing member being integrally formed on said side peripheral walls.

6. A board-to-board plug comprises a plug body, a plurality of plug terminals formed in the plug body and a shielding shell coated outside the plug body, wherein the plug body comprises a body base and a tail part formed at the rear end of the body base, the front end and the rear end of the body base are respectively protruded downwards to form a plug wall body and a step part, a plugging cavity is formed between the step part and the plug wall body, each plug terminal comprises a plug fixing part, a plug contact part formed by forward extension of the plug fixing part and a connecting part formed by backward extension of the plug fixing part to the tail part, and the plug terminal wall body is characterized by comprising a plug terminal wall forming the plug contact part and a plug partition wall separating the plug terminal wall, the plug contact part comprises a first plug vertical wall formed by vertical bending of the plug fixing part and formed on one side of the plugging cavity of the plug terminal wall, the overlapping thickness of the plug terminal wall and the socket contact part is larger than that of the plug partition wall.

7. A board-to-board plug according to claim 6, wherein the plug partition wall is provided with a first cut-out at the longitudinal front or/and rear side, the first cut-out reducing the thickness of the plug partition wall.

8. The board-to-board plug of claim 7, wherein said plug terminal wall is provided with plug terminal slots on a side of said cavity, said plug terminal slots extending rearwardly along said body base upper surface onto said tail portion, said first plug vertical wall being formed in said plug terminal slots of said plug terminal wall.

9. The board-to-board plug of claim 7, wherein said plug terminal wall is formed with plug terminal grooves at both longitudinal sides thereof, said plug terminal grooves extending rearward along an upper surface of said body base onto said tail portion, said plug terminal further comprising a second plug vertical wall formed by bending said first plug vertical wall in the opposite direction, said first and second plug vertical walls being formed in said plug terminal grooves at both front and rear sides of said plug terminal wall, respectively.

10. The board-to-board plug of claim 9, wherein said plug terminal further includes a socket bridge connecting said first and second plug vertical walls, said socket bridge overlying a top end of said plug terminal slot.

11. The board-to-board plug of claim 6, wherein said tail portions extend rearwardly on opposite lateral sides thereof to form mating arms, said tail portions having terminal blocks and spacer blocks for spacing said terminal blocks, said plug terminals including signal terminals and ground terminals for spacing said signal terminals, said signal terminal connecting portions extending above said terminal blocks, said ground terminal connecting portions extending rearwardly beyond said tail portions, said spacer blocks being crimped over said ground terminals.

12. A board-to-board plug according to any one of claims 6 to 11, wherein the first plug vertical wall is stamped with contact domes towards the plug space.

13. A board-to-board connector assembly comprises a socket and a plug spliced with the socket, wherein the socket comprises a socket body and a plurality of socket terminals formed in the socket body, the socket body comprises a body bottom plate, a peripheral wall formed by upwards extending the periphery of the body bottom plate, a socket wall formed by upwards extending the body bottom plate and a butt joint space formed between the socket wall and the peripheral wall, the socket terminals comprise socket contact parts formed on one side of the socket wall positioned at the butt joint space, the plug comprises a plug body and a plurality of plug terminals formed in the plug body, the plug body comprises a body base, the body base is downwards protruded to form a plug wall, and the plug terminals comprise plug contact parts formed on the plug wall, the plug wall body comprises a plug terminal wall for forming the plug contact part and a plug partition wall for partitioning the plug terminal wall, the socket wall body comprises a socket terminal wall for forming the socket contact part and a socket partition wall for partitioning the socket terminal wall, the plug wall body and the plug contact part are inserted into the butt joint space to be in butt joint with the socket wall body and the socket contact part, and the plug contact part and the socket contact part mutually press and electrically contact and enable the plug wall body and the socket wall body to elastically deform in the opposite direction.

14. The board-to-board connector assembly of claim 13, wherein the plug contact portion or the receptacle contact portion is stamped with a contact bump through which the contact bump is pressed and electrically contacted.

15. The board-to-board connector assembly of claim 14, wherein the plug partition wall is provided with first cut-outs at longitudinal front and/or rear sides, the receptacle partition wall is provided with second cut-outs at longitudinal front and/or rear sides, the thickness of the stack of the plug terminal wall and the receptacle contact portion is greater than the thickness of the plug partition wall, and the thickness of the stack of the receptacle terminal wall and the receptacle contact portion is greater than the thickness of the receptacle partition wall.

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