Board-to-board connector

Abstract

The utility model discloses a board-to-board connector, which comprises a plug connector and a socket connector which are matched with each other, the plug connector comprises a plug body and a plug terminal, the plug body is provided with two side walls extending longitudinally, and the plug terminal comprises a first terminal and a second terminal which are fixedly held on the side walls; the socket connector comprises a socket body and socket terminals, the socket body is provided with an island part, two side parts located on the two sides of the island part and two end parts connected to the two side parts so as to jointly define a socket slot, and the socket terminals comprise a forward terminal and a reverse terminal which are of the same structure. The first terminal is provided with a first contact groove located on the outer side of the side wall, the second terminal is provided with a second contact groove located on the inner side of the side wall, and the socket terminal is provided with a locking part protruding into the socket slot. When the plug connector is matched with the socket connector, the locking parts of the forward terminals are buckled in the first contact grooves, and the locking parts of the reverse terminals are buckled in the second contact grooves, so that structural dislocation is realized through the matching, the pull-out force is ensured, and a better hand feeling rate is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of board-to-board connectors, in particular to a board-to-board connector with stable connection. Background Art

[0002] An electrical connector conducts electrical connection and signal transmission between devices, components, and systems, and is a basic component necessary for forming a complete system. Currently, electrical connectors are widely used in various electronic products. A board-to-board connector (abbreviated as BTB) is used to electrically connect two parallel circuit boards, and generally includes a mating plug connector and socket connector. The plug connector and socket connector respectively include an insulating body and conductive terminals. The insulating body mainly functions to insulate and position the conductive terminals, and the conductive terminals mainly function to conduct electricity. Currently, the plug terminals held on the insulating body of the plug connector only have contact grooves provided on the outer side of the side wall, that is, no contact grooves are provided on the inner side of the side wall of the plug terminals; after the plug connector and the socket connector are mated, the pulling force provided between the plug terminals and the socket terminals is relatively small and the feel rate is poor, which is not conducive to the application of the board-to-board connector.

[0003] Therefore, it is desired to propose a new board-to-board connector to overcome the above defects. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a board-to-board connector which has a greater pulling force and a better feel rate when buckling.

[0005] To achieve the above object, the present utility model adopts the following technical solutions: A board-to-board connector includes a plug connector and a socket connector that cooperate with each other; the plug connector includes a plug body and plug terminals fixed on the plug body, the plug body is provided with two side walls extending longitudinally and two end walls connecting the two side walls, the plug terminals include a first terminal and a second terminal fixed on the side walls, and the first terminal and the second terminal on each side wall are arranged at intervals longitudinally. The socket connector includes a socket body and socket terminals fixed on the socket body, the socket body is provided with a central island portion extending longitudinally, two side portions on the transverse two sides of the island portion, and two end portions connecting the two side portions, the island portion, the two side portions and the two end portions jointly define a socket slot, the socket terminals are arranged in two rows longitudinally and include forward terminals and reverse terminals with the same structure, and the forward terminals and the reverse terminals in each row of socket terminals are arranged at intervals longitudinally. The first terminal is provided with a first contact groove on the transverse outer side of the side wall, the second terminal is provided with a second contact groove on the transverse inner side of the side wall, and the socket terminal is provided with a locking portion protruding into the socket slot; when the plug connector is fitted to the socket connector, the locking portion of the forward terminal is buckled into the first contact groove of the first terminal, and the locking portion of the reverse terminal is buckled into the second contact groove of the second terminal.

[0006] In a preferred embodiment, the socket terminal is provided with a fixing portion fixed on the side portion or the island portion, a U-shaped elastic portion extending from the top of the fixing portion into the socket slot, and a welding leg extending transversely from the bottom of the fixing portion, and the locking portion is located on one side of the U-shaped elastic portion adjacent to the fixing portion.

[0007] In a preferred embodiment, the island portion is provided with a longitudinally extending slot penetrating vertically, the fixing portion of the forward terminal is fixed on the side portion, the welding leg of the forward terminal extends transversely outward from the socket body, the fixing portion of the reverse terminal is fixed on the island portion, and the welding leg of the reverse terminal extends transversely inward into the slot.

[0008] In a preferred embodiment, the first terminal is provided with a first inner wall contact portion on the inner wall surface of the side wall, a first outer wall contact portion on the outer wall surface of the side wall, and a first connecting portion connecting the top ends of the first inner wall contact portion and the first outer wall contact portion, the first connecting portion is located at the top end of the side wall, and the first contact groove is located on the first outer wall contact portion.

[0009] In a preferred embodiment, the second terminal is provided with a second inner wall contact portion located on the inner wall surface of the side wall, a second outer wall contact portion located on the outer wall surface of the side wall, and a second connecting portion connecting the tops of the second inner wall contact portion and the second outer wall contact portion. The second connecting portion is located at the top of the side wall, and the second contact groove is located on the second inner wall contact portion.

[0010] In a preferred embodiment, the first terminal is provided with a first welding portion extending laterally outward from the bottom of the first inner wall contact portion, and the second terminal is provided with a second welding portion extending laterally inward from the bottom of the second inner wall contact portion. The extending directions of the first welding portion and the second welding portion on each side wall are opposite in the lateral direction.

[0011] In a preferred embodiment, the side wall and the end wall enclose a plug socket. The plug body is provided with a longitudinal rib protruding upward from the bottom of the plug socket and several openings located on the lateral two sides of the rib. The openings on both sides of the rib are staggered in the longitudinal direction, and the second welding portion extends into the openings.

[0012] In a preferred embodiment, the second terminal is provided with a buried portion extending laterally outward from the bottom of the second outer wall contact portion. The buried portion is buried in the side wall, and the lateral length of the buried portion is smaller than the lateral length of the first welding portion.

[0013] In a preferred embodiment, the first inner wall contact portion, the first connecting portion, and the first outer wall contact portion together form a first inverted U-shaped portion, and the second inner wall contact portion, the second connecting portion, and the second outer wall contact portion together form a second inverted U-shaped portion. When the plug connector is fitted to the socket connector, the first inverted U-shaped portion contacts the U-shaped elastic portion of the forward terminal, and the second inverted U-shaped portion contacts the U-shaped elastic portion of the reverse terminal.

[0014] In a preferred embodiment, the first contact groove and the second contact groove are respectively arranged on the lateral two sides of the side wall and are staggered in the longitudinal direction, and the locking portions of the forward terminals and the reverse terminals in each row of socket terminals are staggered in the longitudinal direction.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the first terminal is provided with a first contact groove on the lateral outer side of the side wall, the second terminal is provided with a second contact groove on the lateral inner side of the side wall, and the socket terminal is provided with a locking portion protruding into the socket slot. When the plug connector is fitted to the socket connector, the locking portion of the forward terminal is snapped into the first contact groove of the first terminal, and the locking portion of the reverse terminal is snapped into the second contact groove of the second terminal. The cooperation of the above plug terminal and socket terminal realizes a structural dislocation to ensure a greater pulling force, and at the same time, there is a better feel rate when snapping. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a perspective view of a plug connector in a preferred embodiment of the utility model.

[0017] Figure 2 is Figure 1 a top view of the plug connector shown.

[0018] Figure 3 is Figure 1 a bottom view of the plug connector shown.

[0019] Figure 4 is Figure 1 an exploded view of the plug connector shown.

[0020] Figure 5 is Figure 1 a front view of the plug terminal in the plug connector shown.

[0021] Figure 6 is a top view of a socket connector in a preferred embodiment of the utility model.

[0022] Figure 7 is Figure 6 an exploded view of the socket connector shown.

[0023] Figure 8 is Figure 7 a perspective view of the socket protection bracket in the socket connector shown.

[0024] Figure 9 is Figure 8 a perspective view of the socket protection bracket from another angle shown.

[0025] Figure 10 is Figure 6 a cross-sectional view of the socket connector shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Please refer to Figures 1 to 10As shown, a preferred embodiment of the present utility model discloses a board-to-board connector, which includes a plug connector 100 and a socket connector 200 that cooperate with each other. The plug connector 100 includes a longitudinally extending plug body 1O, plug terminals 20 fixed on the plug body 1O, and plug protection brackets 30 located at the longitudinal two ends of the plug body 10. The plug body 1O is provided with two side walls 11 extending longitudinally and two end walls 12 connecting the two side walls 11. The plug terminals 20 are fixed on the side walls 11, and the plug protection brackets 30 are fixed on the end walls 12.

[0027] Combined with Figure 5 As shown, the plug terminal 20 includes a first terminal 21 and a second terminal 22 integrally injection-molded on the side wall 11. The first terminal 21 and the second terminal 22 on each side wall 11 are arranged at intervals longitudinally. At the same time, when viewed from the same transverse direction of the plug connector 100, the two side walls 11 are respectively provided with the first terminal 21 and the second terminal 22.

[0028] The first terminal 21 is provided with a first inner wall contact portion 211 located on the inner wall surface of the side wall 11, a first outer wall contact portion 212 located on the outer wall surface of the side wall 11, a first connection portion 213 connecting the top ends of the first inner wall contact portion 211 and the first outer wall contact portion 212, and a first welding portion 214 extending transversely outward from the bottom of the first inner wall contact portion 211 out of the plug body 1O. The first connection portion 213 is located at the top of the side wall 11. The first inner wall contact portion 211, the first connection portion 213, and the first outer wall contact portion 212 together form a first inverted U-shaped portion for contacting the U-shaped elastic portion 52 of the plug terminal 50 of the socket connector 200.

[0029] The second terminal 22 is provided with a second inner wall contact portion 221 located on the inner wall surface of the side wall 11, a second outer wall contact portion 222 located on the outer wall surface of the side wall 11, a second connection portion 223 connecting the top ends of the second inner wall contact portion 221 and the second outer wall contact portion 222, and a second welding portion 224 extending transversely inward from the bottom of the second inner wall contact portion 221. The second connection portion 223 is located at the top of the side wall 11. The second inner wall contact portion 221, the second connection portion 223, and the second outer wall contact portion 222 together form a second inverted U-shaped portion for contacting the U-shaped elastic portion 52 of the plug terminal 50 of the socket connector 200.

[0030] Furthermore, the first inner wall contact portion 211 has a smooth contact surface, and the first outer wall contact portion 212 has a first contact groove 215; the second outer wall contact portion 222 has a smooth contact surface, and the second inner wall contact portion 221 has a second contact groove 225. At the same time, the first contact groove 215 is located laterally outside the side wall 11, and the second contact groove 225 is located laterally inside the side wall 11. That is, on the same side wall 11, the first contact groove 215 and the second contact groove 225 are respectively arranged on the two lateral sides of the side wall 11 and are staggered in the longitudinal direction.

[0031] The extending directions of the first welding portion 214 and the second welding portion 224 on each side wall 11 are opposite in the lateral direction, and the first welding portion 214 and the second welding portion 224 can be fixedly installed on a circuit board (not shown) electrically connected to the plug connector 100; that is, the first welding portion 214 of the first terminal 21 and the second welding portion 224 of the second terminal 22 are respectively located on the two lateral sides of the side wall 11, realizing a bilateral layout of the welding portions of the plug terminals 20 and solving the short - circuit problem when the distance between the plug terminals 20 on the same side is small.

[0032] Specifically, the side wall 11 and the end wall 12 enclose to form a plug slot 13. The plug body 10 is provided with a longitudinal protrusion 130 protruding upward from the bottom of the plug slot 13 and several openings 131 located on the two lateral sides of the protrusion 130. The openings 131 on both sides of the protrusion 130 are staggered in the longitudinal direction, and the second welding portion 224 extends into the openings 131 to facilitate the observation and operation of the second welding portion 224.

[0033] There are also the following differences in the structures of the first terminal 21 and the second terminal 22: the projection of the first connecting portion 213 in the lateral direction is located on the first welding portion 214, and the projection of the second connecting portion 223 in the lateral direction is located outside the second welding portion 224. The second terminal 22 is further provided with a buried portion 226 extending laterally outward from the bottom of the second outer wall contact portion 222 and out of the plug body 10. The buried portion 226 is buried in the side wall 11, and the lateral length of the buried portion 226 is smaller than the lateral length of the first welding portion 215.

[0034] The plug protection bracket 30 is integrally injection-molded on the end wall 12 and covers the end wall 12 and at least part of the side wall 11, thereby enhancing the strength of the plug body 10 and avoiding damage to the plug body 10 when the plug connector 100 is inserted and removed. The plug protection bracket 30 is formed by drawing a metal part and is provided with a top surface shielding portion 31 covering the top surface of the end wall 12, side surface shielding portions 32 extending downward and bent from the transverse two sides of the top surface shielding portion 31, and an outer wall shielding portion 33 extending downward and bent from the longitudinal outer sides of the top surface shielding portion 32. At least part of the side surface shielding portion 32 covers the transverse outer wall surface of the end portion 12, the outer wall shielding portion 33 covers the longitudinal outer wall surface of the end portion 12, and seamless connections are formed between the top surface shielding portion 31, the side surface shielding portions 32, and the outer wall shielding portion 33.

[0035] The plug protection bracket 30 is further provided with an inner wall shielding portion 34 extending downward and bent from the longitudinal inner side of the top surface shielding portion 32 and an extension portion 35 extending transversely from the bottom edge of the side surface shielding portion 32. At least part of the inner wall shielding portion 34 covers the longitudinal inner wall surface of the end portion 12 and does not extend outward beyond the longitudinal inner wall surface of the end portion 12, and the extension portion 35 can be fixedly installed on a circuit board (not shown) electrically connected to the plug connector 100.

[0036] Please refer to Figures 6 to 10 As shown, the socket connector 200 includes a longitudinally extending socket body 40, socket terminals 50 held on the socket body 40, and socket protection brackets 60 located at the longitudinal two ends of the socket body 50. The socket body 40 is provided with a central island portion 41 extending longitudinally, two side portions 42 located on the transverse two sides of the island portion 41, and two end portions 43 connecting the two side portions 42. The island portion 41, the two side portions 42, and the two end portions 43 jointly define a socket slot 44, that is, the island portion 41 is located within the socket slot 44, and the socket slot 44 is for the insertion of the plug connector 100.

[0037] Combined with Figure 10 As shown, the socket terminals 50 are arranged in two rows longitudinally and are assembled and fixed on the side portion 42 or the island portion 41 of the socket body 40. In this embodiment, the socket terminals 50 include forward terminals 501 and reverse terminals 502 with the same structure, and the forward terminals 501 and the reverse terminals 502 in each row of the socket terminals 50 are arranged at intervals longitudinally. Specifically, the socket terminals 50 are provided with fixing portions 51 held on the side portion 12 or the island portion 11, U-shaped elastic portions 52 extending from the top of the fixing portions 51 into the socket slot 44, and welding legs 53 extending transversely from the bottom of the fixing portions 51, and the welding legs 53 can be fixedly installed on a circuit board (not shown) electrically connected to the socket connector 200.

[0038] The island portion 41 is provided with a longitudinally extending slot 410 penetrating vertically. The fixing portion 51 of the positive terminal 501 is held on the side portion 42, and the welding leg 53 of the positive terminal 501 extends laterally outward from the socket body 40. The fixing portion 51 of the negative terminal 502 is held on the island portion 41, and the welding leg 53 of the negative terminal 502 extends laterally inward into the slot 410.

[0039] The U-shaped elastic portion 52 is provided with a locking portion 54 on one side adjacent to the fixing portion 51 and a contact arm 55 on the side away from the fixing portion 51. The locking portion 54 protrudes into the socket slot 44. Therefore, the locking portions 54 of the positive terminals 501 and the negative terminals 502 in each row of the socket terminals 50 are staggered longitudinally. When the plug connector 100 is mated with the socket connector 200, the locking portion 54 of the positive terminal 501 is snapped into the first contact groove 215 of the first terminal 21, and the locking portion 54 of the negative terminal 502 is snapped into the second contact groove 225 of the second terminal 22. The mating of the above-mentioned plug terminals 20 and socket terminals 50 realizes a structural offset to ensure the pulling force, and at the same time, there is a good feel rate when snapping.

[0040] Combined Figure 8 and Figure 9 As shown, the socket protection bracket 60 includes an end protection bracket 70 held on the end portion 43 and an island protection bracket 80 separately provided from the end protection bracket 70, so as to enhance the overall strength of the socket connector 200. The end protection bracket 70 is provided with an integrally formed end reinforcing piece and side reinforcing pieces. The end reinforcing piece covers the end portion 43, and the side reinforcing pieces are connected to the transverse two ends of the end reinforcing piece and at least partially cover the side portion 42.

[0041] The end reinforcing piece is provided with an end top plate portion 71 covering the top surface of the end portion 43, an end side plate portion 72 bent and extending downward from the longitudinal outer side of the end top plate portion 71, and elastic clamping portions 73 extending inward from the transverse two sides of the end side plate portion 72. The end side plate portion 72 shields the outer wall surface of the end portion 42 and is provided with an end welding piece 721 at its bottom edge. The end welding piece 721 can be fixedly installed on a circuit board electrically connected to the socket connector 200. The elastic clamping portions 73 extend into the socket slot 44 to clamp the side shielding portion 32 of the plug protection bracket 30 of the plug connector 100.

[0042] The side wall reinforcing piece is provided with a side top plate portion 74 covering the top surface of the side portion 42 and a side side plate portion 75 extending downward and bent from the lateral outer side of the side top plate portion 74. The side top plate portion 74 is connected to the lateral two ends of the end top plate portion 71, and the side side plate portion 75 at least partially covers the outer wall surface of the side portion 42. The end protection bracket 70 is further provided with a guiding portion 76 drawn and formed from the lateral inner sides of the side top plate portion 71 and the end top plate portion 74. The guiding portion 76 extends downward and obliquely into the socket slot 44 for guiding the insertion of the plug connector 100 when the socket connector 200 and the plug connector 100 are plugged together.

[0043] The island protection bracket 80 is provided with a bottom plate portion 81 located at the bottom of the socket slot 44, an island shielding portion 82 drawn and formed upward from the longitudinal inner side of the bottom plate portion 81, an end fixing portion 83 bent and extending from the longitudinal outer side of the bottom plate portion 81, two clamping arms 84 extending laterally from the bottom plate portion 81 to the side portion 42, and two island welding pieces 85 extending longitudinally outward from the bottom plate portion 81. The island shielding portion 82 covers the longitudinal two sides of the island portion 41 to enhance the overall strength of the island portion 41. The end fixing portion 83 is fixed in the end portion 43 and covered by the end protection bracket 70. Specifically, the end top plate portion 71 covers above the end fixing portion 83.

[0044] In the lateral direction, the two clamping arms 84 are located on the lateral two sides of the island shielding portion 82; in the longitudinal direction, the two clamping arms 84 are located on the longitudinal two sides of the socket terminal 50 and on the longitudinal inner side of the elastic clamping portion 73 to clamp the side shielding portion 32 of the plug protection bracket 30 of the plug connector 100. At the same time, the two island welding pieces 85 extend to the lateral two sides of the end welding piece 721, and the island welding pieces 85 and the end welding piece 721 are welded to the same welding pad on the circuit board. Therefore, when the plug connector 100 is mated with the socket connector 200, the clamping arms 84 and the elastic clamping portion 73 simultaneously contact the plug protection bracket 30 to shunt in parallel to improve the current-carrying capacity, that is, to achieve high-strength protection and high current-carrying capacity of the socket connector 200 in a smaller space.

[0045] When the plug connector 100 is mated with the socket connector 200, the first inverted U-shaped portion of the first terminal 21 contacts the U-shaped elastic portion 52 of the forward terminal 501, and the second inverted U-shaped portion of the second terminal 22 contacts the U-shaped elastic portion 52 of the reverse terminal 502; the first contact groove 215 of the first terminal 21 is engaged with the locking portion 54 of the forward terminal 501, and the second contact groove 225 of the second terminal 22 is engaged with the locking portion 54 of the reverse terminal 502; the pulling force required for pulling out the board-to-board connector is increased, so that the board-to-board connector will not loosen or have abnormal instantaneous breakage without being pressed by foam, thereby preventing the problem of falling off in a special environment. At the same time, the clamping arm 84 of the socket protection bracket 60 and the elastic clamping portion 73 simultaneously contact the side shielding portion 32 of the plug protection bracket 30 to shunt in parallel to improve the current-carrying capacity, that is, to achieve high-strength protection and high current-carrying capacity of the board-to-board connector in a small space.

[0046] In the present utility model, the first terminal 21 is provided with a first contact groove 215 located laterally outside the side wall 11, the second terminal 22 is provided with a second contact groove 225 located laterally inside the side wall 11, and the socket terminal 50 is provided with a locking portion 54 protruding into the socket slot 44. When the plug connector 100 is mated with the socket connector 200, the locking portion 54 of the forward terminal 501 is engaged with the first contact groove 215 of the first terminal 21, and the locking portion 54 of the reverse terminal 502 is engaged with the second contact groove 225 of the second terminal 22. The cooperation between the above plug terminal 20 and the socket terminal 50 realizes structural dislocation to ensure a greater pulling force, and at the same time, there is a better feel rate during engagement.

[0047] In summary, the above are only the preferred embodiments of the present utility model, and the scope of the present utility model should not be limited thereby. That is, all simple equivalent changes and modifications made according to the claims and the content of the specification of the present utility model should still fall within the scope covered by the patent of the present utility model.

Claims

1. A board-to-board connector includes a plug connector and a socket connector that cooperate with each other; the plug connector includes a plug body and plug terminals held on the plug body, the plug body is provided with two side walls extending longitudinally and two end walls connecting the two side walls, the plug terminals include a first terminal and a second terminal held on the side walls, and the first terminal and the second terminal on each side wall are spaced apart longitudinally; the socket connector includes a socket body and socket terminals held on the socket body, the socket body is provided with a central island portion extending longitudinally, two side portions on the transverse sides of the island portion, and two end portions connecting the two side portions, the island portion, the two side portions and the two end portions together define a socket slot, the socket terminals are arranged in two rows longitudinally and include forward terminals and reverse terminals with the same structure, and the forward terminals and the reverse terminals in each row of socket terminals are spaced apart longitudinally; characterized in that: The first terminal is provided with a first contact groove located laterally outside the side wall, the second terminal is provided with a second contact groove located laterally inside the side wall, and the socket terminal is provided with a locking portion protruding into the socket slot; When the plug connector is mated to the socket connector, the locking portion of the forward terminal is latched to the first contact groove of the first terminal, and the locking portion of the reverse terminal is latched to the second contact groove of the second terminal.

2. The board-to-board connector according to claim 1, wherein: The socket terminal is provided with a fixing portion fixed on the side portion or the island portion, a U-shaped elastic portion extending from the top of the fixing portion into the socket slot, and a welding leg extending laterally from the bottom of the fixing portion, and the locking portion is located on one side of the U-shaped elastic portion adjacent to the fixing portion.

3. The board-to-board connector according to claim 2, characterized in that: The island portion is provided with a longitudinally extending slot penetrating vertically. The fixing portion of the forward terminal is fixed on the side portion, the welding leg of the forward terminal extends laterally outward from the socket body, the fixing portion of the reverse terminal is fixed on the island portion, and the welding leg of the reverse terminal extends laterally inward into the slot.

4. The board-to-board connector according to claim 2, wherein: The first terminal is provided with a first inner wall contact portion located on the inner wall surface of the side wall, a first outer wall contact portion located on the outer wall surface of the side wall, and a first connecting portion connecting the tops of the first inner wall contact portion and the first outer wall contact portion. The first connecting portion is located at the top of the side wall, and the first contact groove is located on the first outer wall contact portion.

5. The board-to-board connector according to claim 4, wherein: The second terminal is provided with a second inner wall contact portion located on the inner wall surface of the side wall, a second outer wall contact portion located on the outer wall surface of the side wall, and a second connecting portion connecting the tops of the second inner wall contact portion and the second outer wall contact portion. The second connecting portion is located at the top of the side wall, and the second contact groove is located on the second inner wall contact portion.

6. The board-to-board connector according to claim 5, characterized in that: The first terminal is provided with a first welding portion extending laterally outward from the bottom of the first inner wall contact portion, and the second terminal is provided with a second welding portion extending laterally inward from the bottom of the second inner wall contact portion. The extending directions of the first welding portion and the second welding portion on each side wall are opposite in the lateral direction.

7. The board-to-board connector according to claim 6, wherein: The side wall and the end wall enclose to form a plug slot. The plug body is provided with a longitudinally extending rib protruding upward from the bottom of the plug slot and several openings located on the lateral sides of the rib. The openings on both sides of the rib are staggered longitudinally, and the second welding portion extends into the openings.

8. The board-to-board connector according to claim 6, wherein: The second terminal is provided with a buried portion extending laterally outward from the bottom of the second outer wall contact portion. The buried portion is buried on the side wall, and the lateral length of the buried portion is smaller than the lateral length of the first welding portion.

9. The board-to-board connector according to claim 5, characterized in that: The first inner wall contact portion, the first connection portion, and the first outer wall contact portion together form a first inverted U-shaped portion, and the second inner wall contact portion, the second connection portion, and the second outer wall contact portion together form a second inverted U-shaped portion; when the plug connector is mated to the socket connector, the first inverted U-shaped portion contacts the U-shaped elastic portion of the forward terminal, and the second inverted U-shaped portion contacts the U-shaped elastic portion of the reverse terminal.

10. The board-to-board connector according to claim 1, characterized in that: The first contact groove and the second contact groove are respectively arranged on the transverse two sides of the side wall and are staggered in the longitudinal direction, and the locking portions of the forward terminals and the reverse terminals in each row of the socket terminals are staggered in the longitudinal direction.

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