CN212230649U

CN212230649U - Board-to-board connector assembly

Info

Publication number: CN212230649U
Application number: CN202020807318.1U
Authority: CN
Inventors: 朱跃龙; 朱昭晖; 王佳文
Original assignee: Qidong Qianshuo Electronic Co Ltd
Current assignee: Qidong Qianshuo Electronic Co Ltd
Priority date: 2020-05-14
Filing date: 2020-05-14
Publication date: 2020-12-25
Anticipated expiration: 2030-05-14

Abstract

The utility model discloses a board-to-board connector component, the socket connector includes socket body and socket terminal, the socket body is equipped with two side walls, two end walls connecting the two side walls and a slot surrounded by the side walls and the end walls, the socket terminal is equipped with a fixed part fixed on the side walls, a U-shaped contact part extending into the slot from the fixed part and a first welding leg extending from the fixed part; the plug connector comprises a plug body with two side wall parts and a plug terminal, wherein the plug terminal is provided with an inner wall contact part positioned on the inner wall of the side wall part and an outer wall contact part positioned on the outer wall of the side wall part, and the U-shaped contact part is simultaneously contacted with the inner wall contact part and the outer wall contact part. The socket terminal is provided with a first welding part positioned at the bottom of the U-shaped contact part, and the plug terminal is provided with a second welding part positioned at the bottom of the inner wall contact part and a second welding leg extending from the bottom of the outer wall contact part. When the socket connector is matched with the plug connector, the shortest through-current path is formed by the two welding parts and the two welding feet, so that the overall impedance is smaller, and the improvement of the through-current capacity is facilitated.

Description

Board-to-board connector assembly

Technical Field

The utility model relates to a board is to board connector assembly, especially relates to a board is to board connector assembly with good electric current circulation ability.

Background

A Board to Board Connector (BTB) is a Connector often used in electronic devices (e.g., mobile phones, tablet computers, etc.), and is used to mechanically and electrically interconnect a main Board of the electronic device and modules (e.g., a display module, a touch module, a camera module, etc.). At present, with the development of the rapid charging technology, mobile phone users have made higher demands on the cruising ability of mobile phones and the shortening of the charging time of mobile phone batteries. In order to realize fast charging of the mobile phone battery, devices on the fast charging path are required, for example: batteries, Board-to-Board connectors, Printed Circuit Boards (PCBs), chips, and the like can all carry the transmission of large currents. For a board-to-board connector, in order to improve its own quick charging capability, it is necessary to reduce the transmission impedance of the board-to-board connector. Under the condition that the terminal copper product of current board to board connector has used the highest electrically conductive characteristic material at present, the area of contact between the increase terminal is the design scheme of common resistance that falls, but, can lead to the area size grow of board to board connector through the area of contact between the increase terminal to make it great in the inside shared space of cell-phone, and this again with reduce the inside device size of cell-phone, with the development trend of the setting that increases cell-phone function module left the same place. Therefore, how to increase the current flow capacity of the board-to-board connector based on the size reduction of the board-to-board connector becomes a technical problem to be solved urgently by those skilled in the art.

It is therefore desirable to provide a new board-to-board connector assembly that overcomes the above-mentioned drawbacks.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a board to board connector assembly with shortest route of circulation, this shortest route of circulation makes the board less to the whole impedance of board connector, is favorable to promoting the through-current capacity.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a board to board connector subassembly, includes socket connector and plug connector of mutually supporting, the socket connector is installed on a first circuit board and is included socket ontology and the socket terminal of fixing on socket ontology, socket ontology is equipped with along the both sides wall of longitudinal extension and connects the both ends wall of both sides wall, the both sides wall encloses with both ends wall and establishes and form the slot, the socket terminal is equipped with the fixed part of fixing on the lateral wall, extends into the U type contact site in the slot from the one end of fixed part and extends the first leg of socket ontology from the other end of fixed part. The plug connector is mounted on a second circuit board and comprises a plug body and a plug terminal fixedly held on the plug body, the plug body is provided with two side wall portions extending along the longitudinal direction and two end wall portions connecting the two side wall portions, the plug terminal is provided with an inner wall contact portion located on the inner wall of the side wall portion, an outer wall contact portion located on the outer wall of the side wall portion and a connecting portion connecting the inner wall contact portion and the top end of the outer wall contact portion, and the U-shaped contact portion is in contact with the inner wall contact portion and the outer wall contact portion simultaneously. The socket terminal is provided with a first welding part which is positioned at the bottom of the U-shaped contact part and exposed on the bottom surface of the socket body, the first welding part and the first welding leg are welded on the first circuit board, the plug terminal is provided with a second welding part which is positioned at the bottom of the inner wall contact part and a second welding leg which extends out of the plug body from the bottom of the outer wall contact part, and the second welding part and the second welding leg are welded on the second circuit board.

In a preferred embodiment, a plurality of through-flow paths are formed between the first welding portion and the first solder leg of the receptacle terminal and the second welding portion and the second solder leg of the plug terminal, wherein the through-flow path formed between the first welding portion and the second welding portion is smaller than the through-flow path formed between the first solder leg and the second solder leg.

In a preferred embodiment, the side wall portion and the end wall portion of the plug body enclose a receiving slot, the receptacle body includes a central island portion located in the receiving slot, the island portion is received in the receiving slot of the plug body when the receptacle connector is mated with the plug connector, and the side wall portion and the end wall portion of the plug body are received in the receiving slot.

In a preferred embodiment, the U-shaped contact portion includes a base portion exposed to the bottom surface of the socket body, a first arm extending upward from a side of the base portion adjacent to the island portion, and a second arm extending upward from a side of the base portion adjacent to the side wall and connected to a top end of the fixing portion, the first solder portion is located on the bottom surface of the base portion, the first arm contacts the inner wall contact portion, and the second arm contacts the outer wall contact portion when the socket connector is mated with the plug connector.

In a preferred embodiment, the first arm has an elastic contact portion protruding into the insertion slot, the second arm has a latch portion at an upper end, the outer wall contact portion has a locking portion at an upper end, when the receptacle connector is mated with the plug connector, the elastic contact portion elastically abuts against a contact surface of the inner wall contact portion, and the latch portion and the locking portion are latched to each other and locked.

In a preferred embodiment, the receptacle connector includes end wall protection brackets at two longitudinal ends of the receptacle body, the end wall protection brackets are assembled and fixed on the end walls and are provided with end wall shielding pieces covering the end walls and at least partial side wall shielding pieces covering the side walls, the side wall shielding pieces are connected to two transverse ends of the end wall shielding pieces, each end wall shielding piece includes an end wall shielding portion covering a top surface of the end wall and an outer wall shielding portion bent from an outer side edge of the end wall shielding portion and covering an outer wall surface of the end wall, and the outer wall shielding portion is provided with elastic arms extending from two transverse ends of the outer wall along an inner wall surface of the side wall.

In a preferred embodiment, the end wall is provided with a slot which penetrates through the end wall along the longitudinal direction and is communicated with the slot, the elastic arm penetrates through the slot from the outer side surface of the end wall and extends into the slot, the elastic arm is provided with a protruding part which protrudes into the slot, the end wall shielding piece further comprises an inner wall shielding part which is bent from the inner side edge of the end wall shielding part and covers the inner wall surface of the end wall, and the inner wall shielding part is provided with two convex hulls which protrude into the slot.

In a preferred embodiment, the receptacle connector includes an island portion protection bracket integrally injection-molded at an end portion of the island portion, the island portion protection bracket is provided with a top surface shielding portion covering a top surface of the end portion of the island portion, an end surface shielding portion bent downward from a longitudinal side of the top surface shielding portion and covering an end surface of the end portion of the island portion, and an embedded portion extending from a bottom portion of the end surface shielding portion toward an end wall, the embedded portion is integrally molded at the bottom portion of the receptacle body and exposed to a bottom surface of the receptacle body.

In a preferred embodiment, the plug connector includes metal reinforcing members at both ends of the plug body in the longitudinal direction, the metal reinforcing members having a pair of members arranged on the end wall portions independently and transversely, each of the members including an end wall portion shielding piece at least partially covering the end wall portion, a side wall portion shielding piece at least partially covering the side wall portion, and a bent portion connecting the end wall portion shielding piece and the side wall portion shielding piece.

In a preferred embodiment, the end wall portion shielding sheet includes an end wall portion outer wall shielding portion covering the end wall portion outer wall and an end wall portion inner wall shielding portion bent inward from a top of the end wall portion outer wall shielding portion and covering the end wall portion top surface and the inner wall, the side wall portion shielding sheet includes a side wall portion outer wall shielding portion covering the side wall portion outer wall and a side wall portion inner wall shielding portion bent inward from a top of the side wall portion outer wall shielding portion and covering the side wall portion top surface and the inner wall, and the bent portion is connected to the end wall portion outer wall shielding portion and the side wall portion outer wall shielding portion.

Compared with the prior art, the utility model discloses following beneficial effect has: the socket terminal is provided with a first welding part which is positioned at the bottom of the U-shaped contact part and exposed out of the bottom surface of the socket body, and the first welding part and the first welding foot are welded on the first circuit board; the plug terminal is provided with a second welding part positioned at the bottom of the inner wall contact part and a second welding leg extending out of the bottom of the outer wall contact part, and the second welding part and the second welding leg are welded on a second circuit board. When the socket connector is matched with the plug connector, the socket terminal and the plug terminal form a plurality of through-flow paths through two welding parts and two welding feet, and the shortest through-flow path is formed among the first welding part, the U-shaped contact part, the inner wall contact part and the second welding part; the through-current path of the board-to-board connector is minimized on the basis that the overall size of the board-to-board connector is effectively controlled, so that the overall impedance of the board-to-board connector is small, and the through-current capacity of the board-to-board connector is improved.

Drawings

Fig. 1 is a perspective view of a board-to-board connector assembly according to a preferred embodiment of the present invention.

Fig. 2 is a perspective view of the board-to-board connector assembly shown in fig. 1 when unmated.

Fig. 3 is a perspective view of the receptacle connector of the board-to-board connector assembly shown in fig. 2.

Fig. 4 is an exploded view of the receptacle connector shown in fig. 3.

Fig. 5 is a perspective view of a plug connector of the board-to-board connector assembly shown in fig. 2.

Fig. 6 is an exploded schematic view of the plug connector shown in fig. 5.

Fig. 7 is a cross-sectional view of the board-to-board connector assembly shown in fig. 1 when unmated.

Fig. 8 is a cross-sectional view of the board-to-board connector assembly shown in fig. 1 when mated.

Detailed Description

Referring to fig. 1 to 6, a board-to-board connector assembly including a receptacle connector 100 and a plug connector 200 that are mated with each other is disclosed in a preferred embodiment of the present invention. The receptacle connector 100 is mounted on the first circuit board 300, and the plug connector 200 is mounted on the second circuit board 400, so that when the receptacle connector 100 is mated with the plug connector 200, the first circuit board 300 and the second circuit board 400 are conducted through the board-to-board connector assembly.

Referring to fig. 2 to 4, the socket connector 100 includes a socket body 10 extending along a longitudinal direction, socket terminals 20 fixed on the socket body 10, and protection brackets at two longitudinal ends of the socket body 10. The socket body 10 is provided with a central island portion 11 extending in a longitudinal direction, two side walls 12 located on both lateral sides of the island portion 11, and two end walls 13 connected to the two side walls 12. The island 11, the two side walls 12 and the two end walls 13 together define a slot 14, and the slot 14 is used for inserting the plug connector 200.

The socket terminal 20 has a fixing portion 21 fixed on the sidewall 11, a U-shaped contact portion 22 extending from one end of the fixing portion 21 into the slot 14, a first solder leg 23 extending from the other end of the fixing portion 21 out of the socket body 10, and a first soldering portion 24 located at the bottom of the U-shaped contact portion 22 and exposed to the bottom surface of the socket body 10. The U-shaped contact 22 includes a base 25 exposed to the bottom surface of the socket body 10, a first arm 26 extending upward from a side of the base 25 adjacent to the island 11, and a second arm 27 extending upward from a side of the base 25 adjacent to the side wall 12 and connected to the top end of the fixing portion 21, and the first soldering portion 24 is located on the bottom surface of the base 25. The first arm 26 has a resilient contact portion 261 projecting into the insertion groove 14, and the second arm 27 has a locking portion 271 at the upper end and projecting inward. The first soldering portion 24 and the first solder leg 23 are exposed out of the bottom surface of the socket body 10 and located in the same plane, so as to be soldered on the first circuit board 300.

In the present embodiment, the receptacle terminal 20 includes two pairs of signal terminals located at the center in the longitudinal direction and two pairs of power terminals located at both sides of the signal terminals in the longitudinal direction, and the power terminals and the signal terminals have the same structure in the transverse cross section, and the difference between the two is that: the longitudinal length of the power supply terminal is far greater than that of the signal terminal so as to ensure that the power supply terminal can conduct large current. Meanwhile, the thickness of the power terminal of the socket terminal 20 is 0.1mm, thereby reducing the impedance of the power terminal.

The protective bracket includes an island portion protective bracket 30 integrally injection-molded at an end portion of the island portion 11 and an end wall protective bracket 40 assembled and fixed to the end wall 13, so as to improve the overall strength of the receptacle connector 100. The island protection bracket 30 is integrally injection-molded at the end of the island 11 and is provided with a top surface shielding part 31 covering the top surface of the end of the island 11 and an end surface shielding part 32 covering the end surface of the end of the island 11, and the end surface shielding part 32 is formed by bending downward from one longitudinal side of the top surface shielding part 31. The island protection bracket 30 is integrally injection-molded to the island 11, thereby improving the strength of the island 11 of the socket body 10 and preventing the island 11 from being damaged when the socket connector 100 is inserted and removed. The island portion protection bracket 30 is further provided with a buried portion 34 extending from the bottom of the end surface shielding portion 32 toward the end wall 13, and the buried portion 34 is integrally formed at the bottom of the socket body 10 and exposed to the bottom surface of the socket body 10.

The end wall protection bracket 40 is assembled and fixed on the end wall 13 of the socket body 10 from top to bottom, and is provided with an end wall shielding sheet 41 covering the end wall 13 and a side wall shielding sheet 42 at least partially covering the side wall 12, and the side wall shielding sheet 42 is connected to two lateral ends of the end wall shielding sheet 41. The end wall shielding sheet 41 includes an end wall shielding portion 411 covering the top surface of the end wall 13, an outer wall shielding portion 412 bent from the outer side of the end wall shielding portion 411 and covering the outer wall surface of the end wall 13, and an inner wall shielding portion 413 bent from the inner side of the end wall shielding portion 411 and covering the inner wall surface of the end wall 13, and the outer wall shielding portion 412 includes elastic arms 414 extending from both lateral ends thereof along the inner wall surface of the side wall 12. The elastic arm 414 has a protrusion 415 protruding into the slot 14, and the inner wall shielding portion 413 has two protrusions 416 protruding into the slot 14 for ensuring the passage of large current when the receptacle connector 100 is plugged.

The end wall 13 is provided with a slot 17 which penetrates the end wall 13 along the longitudinal direction and is communicated with the slot 14, and the elastic arm 414 penetrates the slot 17 from the outer side surface of the end wall 13 and extends into the slot 14. The spring arm 414 extends in the longitudinal direction in the region of the side wall 12, and a gap is formed between the spring arm 414 and the inner wall surface of the side wall 12. The side wall 12 of the socket body 10 is provided with a relief groove 15 corresponding to the elastic arm 414, and the relief groove 15 is formed by recessing from the inner wall surface of the side wall 12, so as to provide a sufficient movement space when the elastic arm 414 is elastically deformed.

The side wall shielding sheet 42 of the end wall protecting bracket 40 is provided with side wall shielding parts 421 extending from two ends of the end wall shielding part 411 along the longitudinal direction, and the side wall shielding parts 421 at least partially cover the top surfaces of the side walls 12. The sidewall shielding portion 421 covers at least a portion of the elastic arm 414, so as to protect the elastic arm 414 and limit the elastic arm 413. The sidewall shielding plate 42 further has a soldering foot 422 bent and extended downward from the outer side edge of the sidewall shielding portion 421, and the soldering foot 422 can be fixedly mounted on the first circuit board 300 electrically connected to the receptacle connector 100.

The welding feet 422 are fastened to the outer wall surface of the side wall 12 to fix the end wall protection bracket 40 to the socket body 10. The socket body 10 is provided with a latch groove 16 located on the outer wall surface of the side wall 12, and the welding leg 422 is accommodated in the latch groove 16 and provided with an barb engaged with the wall surface of the latch groove 16, so as to enhance the stability of the end wall protection bracket 40 fixed to the socket body 10.

Referring to fig. 5 to 6, the plug connector 200 includes a plug body 50 extending along a longitudinal direction, a terminal 60 fixed on the plug body 50, and metal reinforcements at two longitudinal ends of the plug body 50. The plug body 50 is provided with two side wall portions 51 extending in the longitudinal direction and two end wall portions 52 connected to the two side wall portions 51. The two side walls 51 and the two side walls 52 define a receiving slot 53, and the receiving slot 53 is used for inserting the island 11 of the receptacle connector 100.

The plug terminal 60 is fixed on the sidewall 51 and has an inner wall contact portion 61 located on the inner wall of the sidewall 51, an outer wall contact portion 62 located on the outer wall of the sidewall 51, a connecting portion 63 connecting the inner wall contact portion 61 and the top end of the outer wall contact portion 62, a second welding portion 64 located at the bottom of the inner wall contact portion 61, and a second solder leg 65 extending from the bottom of the outer wall contact portion 62 to the plug body 50. The inner wall contact portion 61 has a smooth contact surface, the outer wall contact portion 62 has a locking portion 66 located at the upper end and protruding outward, and the second soldering portion 64 and the second solder leg 65 are exposed on the bottom surface of the plug body 1O and located in the same plane so as to be soldered on the second circuit board 400.

The metal reinforcing members are integrally injection-molded at both longitudinal ends of the plug body 50 to improve the overall strength of the plug connector 200. The metal reinforcing member has a pair of members 70 which are independent from each other and transversely arranged on the end wall portion 52, and each member 70 covers the outer side of the plug body 50, so that the strength of the plug body 50 is improved, and the plug body 50 is prevented from being damaged when the plug connector 200 is plugged and unplugged. The member 70 includes an end wall portion shielding sheet 71 at least partially covering the end wall portion 52, a side wall portion shielding sheet 72 at least partially covering the side wall portion 51, and a bent portion 73 connecting the end wall portion shielding sheet 71 and the side wall portion shielding sheet 72.

The end wall portion shielding sheet 71 includes an end wall portion outer wall shielding portion 711 covering the outer wall of the end wall portion 52, and an end wall portion inner wall shielding portion 712 bent inward from the top of the end wall portion outer wall shielding portion 711 and covering the top surface and the inner wall of the end wall portion 52, the side wall portion shielding sheet 72 includes a side wall portion outer wall shielding portion 721 covering the outer wall of the side wall portion 51, and a side wall portion inner wall shielding portion 722 bent inward from the top of the side wall portion outer wall shielding portion 721 and covering the top surface and the inner wall of the side wall portion 51, and the bent portion 73 is connected between the end wall portion outer wall shielding portion 711 and the side wall portion outer wall shielding portion 721. Meanwhile, the bottom of the sidewall outer wall shielding part 721 may be fixedly mounted on the second circuit board 400 electrically connected to the plug connector 200.

In the present embodiment, the plug terminal 60 includes two pairs of signal terminals located at the center in the longitudinal direction and two pairs of power terminals located at both sides in the longitudinal direction of the signal terminals, and the side wall shielding pieces 72 of the member 70 constitute the power terminals of the plug terminal 60 to be butted against the power terminals of the receptacle terminal 20. The power terminal of the plug terminal 60 has the same structure as the signal terminal in a transverse cross section, and the difference between the two is that: the longitudinal length of the power terminal is much longer than that of the signal terminal and is connected to the end wall shielding piece 71 to ensure that the power terminal can conduct large current. Meanwhile, the thickness of the power terminal (i.e., the side wall portion shielding piece 72) of the plug terminal 60 is 0.1mm, thereby reducing the impedance of the power terminal.

As shown in fig. 7 and 8, when the receptacle connector 100 is mated with the plug connector 200, the island 11 of the receptacle body 10 is received in the receiving groove 53 of the plug body 50, and the side wall 51 and the end wall 52 of the plug body 50 are received in the slot 14 of the receptacle body 10. The end wall protection bracket 40 abuts against the member 70 of the metal reinforcement, wherein the convex portion 415 of one elastic arm 414 of the end wall protection bracket 40 abuts against the end wall portion outer wall shielding portion 711 of the member 70, and one convex hull 416 abuts against the side wall portion outer wall shielding portion 721 of the member 70, so that backflow can be formed at two abutting points to form multi-point contact, the impedance is reduced, and the current capacity is increased.

The U-shaped contact portion 22 of the receptacle terminal 20 contacts both the inner wall contact portion 61 and the outer wall contact portion 62 of the plug terminal 60, wherein the first arm 26 of the U-shaped contact portion 22 contacts the inner wall contact portion 61 and the second arm 27 contacts the outer wall contact portion 62, more specifically, the elastic contact portion 261 of the first arm 26 elastically abuts against the contact surface of the inner wall contact portion 61, and the locking portion 271 of the second arm 27 and the locking portion 66 of the outer wall contact portion 62 are locked by being snapped to each other. Accordingly, a plurality of current paths (i.e., current flow paths) are formed between the first soldering portion 24 and the first leg 23 of the receptacle terminal 20 and the second soldering portion 64 and the second leg 65 of the plug terminal 60. Compare and only form single through-flow path between first leg and the second leg in traditional technique, the utility model discloses a set up the through-flow capacity that a plurality of through-flow paths increased between the terminal.

The through-flow path formed between the first welding portion 24 and the second welding portion 64 is smaller than the through-flow path formed between the first fillet 23 and the second fillet 65, and the through-flow path formed among the first welding portion 24, the U-shaped contact portion 22, the inner wall contact portion 61, and the second welding portion 64 is the shortest, so that the terminal device can be rapidly charged. In the present embodiment, the maximum current that the current path between the power supply terminals conducts is 20A.

In summary, the above is only a preferred embodiment of the present invention, and the scope of the present invention should not be limited thereby, and all the simple equivalent changes and modifications made according to the claims and the content of the specification should still belong to the scope covered by the present invention.

Claims

1. A board-to-board connector assembly comprises a socket connector and a plug connector which are matched with each other, wherein the socket connector is installed on a first circuit board and comprises a socket body and socket terminals fixedly held on the socket body, the socket body is provided with two side walls extending along the longitudinal direction and two end walls connected with the two side walls, the two side walls and the two end walls are enclosed to form slots, the socket terminals are provided with fixing portions fixedly held on the side walls, U-shaped contact portions extending into the slots from one ends of the fixing portions and first welding pins extending out of the socket body from the other ends of the fixing portions, the plug connector is installed on a second circuit board and comprises a plug body and plug terminals fixedly held on the plug body, the plug body is provided with two side wall portions extending along the longitudinal direction and two end wall portions connected with the two side wall portions, and is provided with inner wall contact portions positioned on the inner walls of, The U-shaped contact part simultaneously contacts the inner wall contact part and the outer wall contact part; the method is characterized in that: the socket terminal is provided with a first welding part which is positioned at the bottom of the U-shaped contact part and exposed on the bottom surface of the socket body, the first welding part and the first welding leg are welded on the first circuit board, the plug terminal is provided with a second welding part which is positioned at the bottom of the inner wall contact part and a second welding leg which extends out of the plug body from the bottom of the outer wall contact part, and the second welding part and the second welding leg are welded on the second circuit board.

2. The board-to-board connector assembly of claim 1, wherein: a plurality of through-flow paths are formed between the first welding part and the first welding leg of the socket terminal and the second welding part and the second welding leg of the plug terminal, wherein the through-flow path formed between the first welding part and the second welding part is smaller than the through-flow path formed between the first welding leg and the second welding leg.

3. The board-to-board connector assembly of claim 1, wherein: the side wall portion and the end wall portion of the plug body are arranged in a surrounding mode to form an accommodating groove, the socket body comprises a central island portion located in the slot, when the socket connector is matched with the plug connector, the island portion is accommodated in the accommodating groove of the plug body, and the side wall portion and the end wall portion of the plug body are accommodated in the slot.

4. The board-to-board connector assembly of claim 3, wherein: the U-shaped contact portion comprises a base portion exposed on the bottom surface of the socket body, a first arm extending upwards from one side of the base portion adjacent to the island portion and a second arm extending upwards from one side of the base portion adjacent to the side wall and connected to the top end of the fixing portion, the first welding portion is located on the bottom surface of the base portion, when the socket connector is matched with the plug connector, the first arm is in contact with the inner wall contact portion, and the second arm is in contact with the outer wall contact portion.

5. The board-to-board connector assembly of claim 4, wherein: the first arm is provided with an elastic contact part protruding into the slot, the second arm is provided with a locking part positioned at the upper end, the outer wall contact part is provided with a locking part positioned at the upper end, when the socket connector is matched with the plug connector, the elastic contact part is elastically abutted against the contact surface of the inner wall contact part, and the locking part are mutually buckled and locked.

6. The board-to-board connector assembly of claim 1, wherein: the socket connector comprises end wall protection supports positioned at the two longitudinal ends of a socket body, the end wall protection supports are assembled and fixed on the end walls and are provided with end wall shielding sheets covering the end walls and side wall shielding sheets at least partially covering the side walls, the side wall shielding sheets are connected to the two transverse ends of the end wall shielding sheets, each end wall shielding sheet comprises an end wall shielding part covering the top surfaces of the end walls and an outer wall shielding part bent from the outer side edge of the end wall shielding part and covering the outer wall surface of the end wall, and the outer wall shielding part is provided with elastic arms extending from the two transverse ends of the outer wall along the inner wall surface of the side wall.

7. The board-to-board connector assembly of claim 6, wherein: the end wall is provided with a slot which longitudinally penetrates through the end wall and is communicated with the slot, the elastic arm penetrates through the slot from the outer side surface of the end wall and extends into the slot, the elastic arm is provided with a protruding part which protrudes into the slot, the end wall shielding piece further comprises an inner wall shielding part which is bent from the inner side edge of the end wall shielding part and covers the inner wall surface of the end wall, and the inner wall shielding part is provided with two convex hulls which protrude into the slot.

8. The board-to-board connector assembly of claim 1, wherein: the socket connector comprises an island portion protection support integrally injection-molded at the end portion of the island portion, the island portion protection support is provided with a top surface shielding portion covering the top surface of the end portion of the island portion, an end surface shielding portion bending downwards from one longitudinal side of the top surface shielding portion and covering the end surface of the end portion of the island portion, and an embedding portion extending from the bottom of the end surface shielding portion towards the end wall, and the embedding portion is integrally molded at the bottom of the socket body and is exposed out of the bottom surface of the socket body.

9. The board-to-board connector assembly of claim 1, wherein: the plug connector comprises metal reinforcing parts positioned at two longitudinal ends of a plug body, each metal reinforcing part is provided with a pair of components which are independent from each other and are transversely arranged on the end wall part, and each component comprises an end wall part shielding sheet at least partially covering the end wall part, a side wall part shielding sheet at least partially covering the side wall part and a bending part connecting the end wall part shielding sheet and the side wall part shielding sheet.

10. The board-to-board connector assembly of claim 9, wherein: the end wall part shielding piece comprises an end wall part outer wall shielding part and an end wall part inner wall shielding part, the end wall part outer wall shielding part covers the end wall part outer wall, the end wall part inner wall shielding part is bent inwards from the top of the end wall part outer wall shielding part and covers the top surface of the end wall part and the inner wall, the side wall part shielding piece comprises a side wall part outer wall shielding part and a side wall part inner wall shielding part, the side wall part outer wall shielding part covers the side wall part outer wall, the side wall part inner wall shielding part is bent inwards from the top of the side wall part outer wall shielding part and covers the top surface of the side wall.