Board-to-board connector

Abstract

The utility model discloses a board-to-board connector. The board-to-board connector comprises a male seat connector and a female seat connector. The male seat connector comprises a male insulation base, a male seat conductive terminal and a male seat protection shell. The female seat connector comprises a female insulation base, a female seat conductive terminal and a female seat protection shell. According to the utility model, a plurality of buckling points are designed at the contact parts of the male seat connector and the female seat connector, so that the plugging stability and the electrical connection reliability are enhanced; the welding strength of the male socket protection shell is enhanced by arranging a reinforcing welding leg which horizontally extends towards the outer side of the end wall of the short edge at the lower end of the covering part of the inner side surface of the end wall of the male socket protection shell; in addition, the male seat protection shell and the male seat power supply terminal are integrally formed, and the female seat protection shell adopts a full-wrapping protection structure design and is integrally formed with the cap part of the middle island structure, so that the assembly process is greatly simplified, the manufacturing cost is reduced, and the durability and the electromagnetic shielding performance of the connector are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric connectors, and in particular relates to a board-to-board connector. Background Art

[0002] Board to Board (Board to Board) Board to board connector is a commonly used connection element in electronic products. Its function is to establish an electrical connection between two circuit boards. It is mainly composed of two parts: a female connector and a male connector. The female connector is usually welded on one circuit board, while the male connector is welded on another circuit board. The female connector and the male connector have a corresponding number of conductive terminals for transmitting electronic signals and electricity. By plugging the female and male connectors, the communication connection between the two circuit boards can be achieved.

[0003] However, the existing board-to-board connectors still have some problems during use. For the socket connector and board-to-board connector with publication number CN219843174U, in the existing board-to-board connector, the end protection part and the center island protection part are split designs, which not only complicates the assembly process, but also the end wall protection part of the female connector can only provide partial protection, and cannot effectively cover the inner and outer corners of the insulating base, and cannot provide all-round protection. The coverage gap at the corner also leads to poor electromagnetic shielding effect, and due to the small covering area, the flow area and the heat dissipation area are also small, and it is difficult to conduct a larger current. The welding pins of the male protective shell of the male connector are far from the snap-fit ​​point and the welding area is small. There is a risk of deformation after multiple plugging and unplugging. In addition, there are fewer snap-fit ​​points, and two snap-fit ​​points are provided near the two ends, which cannot fully guarantee the connection reliability and stability of the male connector and the female connector after being plugged into each other.

[0004] Therefore, it is necessary to improve the existing connector socket to further enhance the mating stability, anti-electromagnetic interference, structural strength and service life of the board-to-board connector. Utility Model Content

[0005] The utility model aims to provide a board-to-board connector to solve the deficiencies of the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A board-to-board connector, comprising a male connector and a female connector detachably electrically connected to the male connector, the male connector comprising a male insulating base, a male conductive terminal and a male protective shell, the male insulating base comprising a rectangular central slot located in the middle, a pair of oppositely arranged long side walls and a pair of oppositely arranged short side end walls; the male conductive terminal comprises a male signal terminal and a male power terminal embedded in the two long side walls; the male protective shell comprises an end wall outer side surface covering portion covering the outer side surface of the short side end wall, and the two ends of the end wall outer side surface covering portion are along the outer side of the long side wall The surface extends to form a side wall outer side covering portion, the end of the side wall outer side covering portion is horizontally bent inward and covered on the inner side of the long side wall to form a side wall inner side covering portion, the top of the side wall outer side covering portion is bent downward and covered on the top surface of the long side wall to form a side wall top surface covering portion, the top of the end wall outer side covering portion is bent downward and covered on the top surface of the short side end wall to form an end wall top surface covering portion, the end wall top surface covering portion vertically extends downward and covers the inner side of the short side end wall to form an end wall inner side covering portion, and the lower end of the end wall inner side covering portion horizontally extends toward the outside of the short side end wall to form a reinforcing weld foot.

[0008] Furthermore, the female connector includes a female insulating base, a female conductive terminal and a female protective shell, the female insulating base includes a pair of relatively arranged long side structures, a pair of relatively arranged short side structures and a middle island structure located in the middle of the female insulating base and protruding upward; the female conductive terminal includes a female signal terminal and a female power terminal embedded in the female terminal groove between the long side structure and the middle island structure; the female protective shell includes an end protection portion covering the upper end of the female insulating base and a cap portion covering the end of the middle island structure, and a connecting and fixing portion located on the inner bottom surface of the female insulating base to connect the end protection portion with the middle island protection portion as an integral whole.

[0009] Furthermore, the end protection portion includes a top wall protection portion that fully covers the top surface of the short side structure and partially covers the top surface of the long side structure, an inner wall protection portion that fully covers the inner side surface of the short side structure and partially covers the inner side surface of the long side structure, an outer wall protection portion that fully covers the outer side surface of the short side structure and partially covers the outer side surface of the long side structure, an inner corner protection portion covering the inner corners of the short side structure and the long side structure, and an outer corner protection portion covering the outer corners of the short side structure and the long side structure.

[0010] Furthermore, the connecting and fixing portion is a horizontal inward extension of the bottom edge of the outer wall protection portion on the outer side surface of the short side structure, and is integrally connected to the cap portion. Elastic contact portions extending vertically upward are provided on both sides of the connecting and fixing portion.

[0011] Furthermore, the connecting and fixing portion is a horizontal inward extension of the bottom edge of the inner wall protection portion on the inner side of the short side structure, and is integrally connected to the cap portion, and the outer wall protection portion on the outer side of the long side structure is provided with an elastic abutment portion that bends inward and extends upward.

[0012] Furthermore, a snap-fit ​​groove is provided on the outer side surface of the male seat protective shell, and correspondingly, a first snap-fit ​​protrusion is provided on the inner wall of the end protection portion.

[0013] Furthermore, the female socket power terminal is integrally bent and formed, including a retaining portion embedded in the female socket terminal groove, a terminal welding foot extending toward the outside of the female insulating base, a first contact arm extending toward the inside of the female insulating base for contacting the outer side surface covering portion of the side wall of the male socket protective shell, a second contact arm for contacting the inner side surface covering portion of the side wall of the male socket protective shell, and a connecting arm for connecting the first contact arm with the second contact arm, and the end of the second contact arm is bent to form a contact head that contacts the inner side surface covering portion of the side wall.

[0014] Furthermore, the first contact arm is preset with a second snap-fitting protrusion that matches with the snap-fitting groove on the outer side surface of the male socket protective shell.

[0015] Furthermore, the male conductive terminal and the male protective shell are both made of metal materials and are fixed together with the male insulating base by means of inlay molding; the female conductive terminal and the female protective shell are both made of metal materials and are fixed together with the male insulating base by means of inlay molding.

[0016] Compared with the prior art, the board-to-board connector provided by the present invention has the following beneficial technical effects:

[0017] 1. The male power terminal and the male protective shell of the male connector of the utility model are integrated, and the cap portion and the female protective shell of the female connector are also integrated, and there is no need to assemble the shell, which greatly saves assembly process and cost.

[0018] 2. The female seat protective shell of the utility model is a fully enclosed seamless metal protective part formed by a stretching process, which can provide all-round protection for the inner and outer corners of the insulating base. It is less likely to deform during the plugging and unplugging process, the insulating base is less likely to wear, has a longer service life, and has better electromagnetic shielding performance.

[0019] 3. The lower end of the inner side covering portion of the end wall of the male socket protective shell of the utility model is also provided with a reinforcing weld foot extending horizontally toward the outside of the short side end wall. Compared with the weld foot extending outward from the lower end of the outer side covering portion of the end wall, the reinforcing weld foot provided by the utility model not only has a larger welding surface, but is also closer to the snap-fit ​​point, so that the torque applied to the welding point of the connector during the plugging and unplugging process is smaller, which can ensure that the welding is more firm and reliable.

[0020] 4. The four-sided contact parts of the male connector and the female connector of the utility model are provided with multiple snap-fit ​​points, which effectively enhances the mechanical plug-in stability and electrical connection reliability.

[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described below are only some embodiments. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 A schematic diagram of the overall structure of a board-to-board connector provided by an embodiment of the utility model;

[0024] Figure 2 A cross-sectional view of a board-to-board connector along line AA provided by an embodiment of the utility model;

[0025] Figure 3 An exploded view of a male connector in a board-to-board connector provided by an embodiment of the utility model;

[0026] Figure 4 A schematic diagram of the structure of a male socket protective shell in a male socket connector provided by an embodiment of the utility model;

[0027] Figure 5 An exploded view of a female connector in a male connector provided by an embodiment of the utility model;

[0028] Figure 6 A schematic diagram of the structure of a female socket protective shell in a female socket connector provided in an embodiment of the utility model;

[0029] Figure 7 A schematic structural diagram of an alternative solution for a female socket protective shell in a female socket connector provided in an embodiment of the utility model.

[0030] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0031] 1-Male insulating base, 101-Central slot, 102-Long side wall, 103-Short side end wall, 2-Male signal terminal, 3-Male terminal slot, 4-Male protective shell, 401-End wall top surface covering part, 402-End wall inner side covering part, 403-End wall outer side covering part, 404-Side wall top surface covering part, 405-Side wall inner side covering part, 406-Side wall outer side covering part, 407-Reinforced welding foot, 408-Snap-fit ​​groove, 409-Male protective shell welding foot, 5-Female insulating base, 501-Mid-island structure, 502-Long side structure, 503-Short side structure, 504-Pair slot, 6-Female signal terminal , 7-female socket power terminal, 701-holding portion, 702-terminal welding foot, 703-first contact arm, 704-second contact arm, 705-contact head, 706-connecting arm, 707-second snap-fit ​​protrusion, 8-female socket protective shell, 801-top wall protection portion, 802-inner wall protection portion, 803-outer wall protection portion, 804-inner corner protection portion, 805-outer corner protection portion, 806-cap portion, 807-first snap-fit ​​protrusion, 808-female socket protective shell welding foot, 809-connecting and fixing portion, 810-elastic contact portion, 811-center island cap, 812-hook glue portion, 813-connecting piece, 814-elastic abutment portion. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] like Figure 1 As shown, an embodiment of the utility model provides a board-to-board connector, including a male connector and a female connector detachably electrically connected to the male connector. Specifically:

[0034] like Figure 2 and Figure 3 As shown, the male connector includes a male insulating base 1, a male conductive terminal and a male protective shell 4. The male conductive terminal and the male protective shell 4 are both made of metal materials and are directly fixed to the male insulating base 1 by insert injection molding, saving assembly steps and costs.

[0035] The male insulating base 1 is the basic part of the male connector, and its main body adopts a rectangular box structure design, including a rectangular central slot 101 located in the middle, a pair of oppositely arranged long side walls 102, and a pair of oppositely arranged short side end walls 103. As a mounting base for other components, it provides a physical support and plays a role in electrical insulation, which can isolate each male conductive terminal so that each male conductive terminal will not interfere with each other. The male conductive terminals, as the electrical connection part of the male connector, are made of elastic metal sheets. There are two groups of male conductive terminals, which are symmetrically embedded in the male terminal slots 3 in the middle of the two long side walls 102. Each group of male conductive terminals includes a plurality of male signal terminals 2 arranged side by side and at equal intervals. The welding end of the male conductive terminal passes through the bottom plate of the male insulating base 1 and is exposed outside the male insulating base 1, which is used to connect the circuit board to realize the transmission of electrical signals.

[0036] like Figures 2 to 4 As shown, the male seat protective shell 4 is integrally formed by a bending process, and includes an end wall protection part and a side wall protection part. The end wall protection part includes an end wall outer side surface covering part 403 covering the outer side surface of the short side end wall 103, the top of the end wall outer side surface covering part 403 is bent downward to cover the top surface of the short side end wall 103 to form an end wall top surface covering part 401, the end wall top surface covering part 401 extends vertically downward to cover the inner side surface of the short side end wall 103 to form an end wall inner side surface covering part 402, and the lower end of the end wall inner side surface covering part 402 extends horizontally to the outside of the short side end wall 103 to form a reinforced welding foot 407. Compared with the welding foot formed by extending outward from the lower end of the end wall outer side surface covering part 403, the reinforced welding foot 407 provided by the utility model not only has a larger welding surface, but also is closer to the buckle point, so that the torque on the welding point of the connector during the plugging and unplugging process is smaller, which can ensure that the welding is more firm and reliable. The side wall protection portion includes a side wall outer side covering portion 406 which is arranged at both ends of the end wall outer side covering portion 403 and extends along the outer side of the long side wall 102. The bottom edge of the side wall outer side covering portion 406 extends horizontally outward to form a male socket protective shell welding foot 409 for connecting to the circuit board. The top of the side wall outer side covering portion 406 is bent downward in an arc shape and covers the top surface of the long side wall 102 to form a side wall top surface covering portion 404. The end of the side wall outer side covering portion 406 is bent horizontally inward and covers the inner side of the long side wall 102 to form a side wall inner side covering portion 405. The side wall inner side covering portion 405 can serve as the male socket power terminal of the male socket connector and be electrically connected to the female socket connector.

[0037] like Figure 2 and Figure 5As shown, the female connector includes a female insulating base 5, a female conductive terminal, and a female protective shell 8. The female conductive terminal and the female protective shell 8 are both made of metal materials. Similarly, the female conductive terminal and the female protective shell 8 are also directly molded and fixed together with the female insulating base 5 by insert injection molding.

[0038] like Figure 3 As shown, the female insulating base 5 is the basic part of the female connector, and its main body adopts a rectangular box structure design. As a mounting base for other components, it provides a physical support and plays an electrical insulation role, which can isolate each female conductive terminal so that each female conductive terminal will not interfere with each other. The female insulating base 5 includes a pair of relatively arranged long side structures 502, a pair of relatively arranged short side structures 503, and an island structure 501 that is integrated in the middle of the bottom plate of the insulating base and protrudes upward. The size of the island structure 501 matches the central slot 101 of the male insulating base 1, and the island structure 501 is separated from the long side structure 502 and the short side structure 503 by a certain distance, forming a U-shaped slot 504 for plugging with the male connector.

[0039] The female conductive terminal includes a female signal terminal 6 and a female power terminal 7. There are multiple female signal terminals 6, which are arranged side by side and spaced in the female terminal groove between the long side structure 502 and the middle island structure 501 to form a female signal terminal 6 group. The female power terminals 7 are located on both sides of the female signal terminal 6 group. The female conductive terminal is also made of elastic metal sheet, as the main working part of the connector, one end of which can form a close contact with the male conductive terminal through the elastic force generated by elastic deformation when the male connector is inserted into the female connector, completing the electrical connection function. The welding end of the female conductive terminal passes through the bottom plate of the female insulating base 5 and is exposed outside the female insulating base 5, which is used to connect the circuit board to realize the transmission of electrical signals.

[0040] like Figure 5 and Figure 6As shown, the female seat protection shell 8 is an integrated component formed by stretching and bending a metal plate, and includes an end protection portion and an island protection portion. The end protection portion is coated above the end of the female insulating base 5 to strengthen the structural strength of the insulating base 1 and prevent the connector from being damaged when impacted by external force. The end protection portion includes a top wall protection portion 801 that fully covers the top surface of the short side structure 503 and partially covers the top surface of the long side structure 502, an inner wall protection portion 802 that fully covers the inner side surface of the short side structure 503 and partially covers the inner side surface of the long side structure 502, an outer wall protection portion 803 that fully covers the outer side surface of the short side structure 503 and partially covers the outer side surface of the long side structure 502, a mother seat protection shell weld foot 808 that is arranged at the bottom end of the outer wall protection portion 803 and extends vertically downward or horizontally outward, an inner corner protection portion 804 that covers the inner corners of the short side structure 503 and the long side structure 502, and an outer corner protection portion 805 that covers the outer corners of the short side structure 503 and the long side structure 502. By adopting this full-enclosed design that covers both the inner and outer corners, the mechanical strength of the female insulating base 5 can be increased, and the plug-in connection makes it less prone to wear and deformation, reducing the wear of the connector during the plug-in and unplugging process of the board-to-board connector, and increasing the service life of the female connector. At the same time, it can also cooperate with the male protective shell 4 on the male connector to improve the electromagnetic shielding performance of the board-to-board connector.

[0041] The center island protection part includes a cap part 806 and a connection fixing part 809, and the cap part 806 is completely covered on the end of the center island structure 501 to protect the end of the center island structure 501. The connection fixing part 809 is located on the inner bottom surface of the female insulating base 5, connecting the end protection part with the center island protection part as a whole, further simplifying the assembly process, and effectively improving the structural strength of the female seat protection shell 8, and increasing the flow area of ​​the connector. Specifically in this embodiment, the connection fixing part 809 is a horizontal inward extension of the bottom edge of the outer wall protection part 803 on the outer side of the short side structure 503, and is integrally connected with the cap part 806, simplifying the assembly process while making the end protection part and the center island protection part form a whole. The connection fixing part 809 is provided with elastic contact parts 810 extending vertically upward on both sides, which are used to make electrical contact with the side wall protection part of the male seat protection shell 4.

[0042] It is worth mentioning that Figure 7As shown, as an alternative, the connecting piece 813 (equivalent to the connecting fixing portion 809 in the first embodiment) can also be a horizontal inward extension of the bottom edge of the inner wall protection portion 802 on the inner side of the short side structure 503, and the extended end of the connecting piece 813 is connected to the island cap 811 (equivalent to the cap portion 806 in the first embodiment), simplifying the assembly process while making the end protection portion and the island protection portion form a whole. Correspondingly, in order to prevent mutual interference between the sheets and facilitate the molding of the island protection portion, the elastic abutment portion 814 (equivalent to the elastic contact portion 810 in the first embodiment) at the end of the female connector is an extension of the outer wall protection portion 803 on the outer side of the long side structure 502, which is bent upward to form a contact terminal that is electrically in contact with the side wall protection portion of the male protective shell 4. In addition, it is obvious that a hook glue portion 812 can also be provided on the cap portion 806, so that the island protection portion can be more firmly connected to the end of the island structure 501 to prevent loosening.

[0043] like Figures 2 to 7 As shown, as a preferred embodiment, an anti-slip structure is also provided on the side wall where the female seat protective shell 8 contacts the male seat protective shell 4. The anti-slip structure specifically includes a snap-fit ​​groove 408 and a snap-fit ​​protrusion that matches the snap-fit ​​groove 408. The snap-fit ​​groove 408 is provided on the outer surface of the male seat protective shell 4. The snap-fit ​​protrusion includes a first snap-fit ​​protrusion 807 provided on the inner wall of the end protection part (i.e., the inner wall protection part 802). The female seat power terminal 7 is integrally bent and formed and adopts a double-point contact design, such as Figure 5 As shown, the female socket power terminal 7 includes a retaining portion 701 embedded in the female socket terminal groove, a terminal welding foot 702 extending toward the outside of the female insulating base 5, a first contact arm 703 extending toward the inside of the female insulating base 5 for contacting the side wall outer surface covering portion 406 of the male socket protective shell 4, a second contact arm 704 for contacting the male socket power terminal 3 in the male socket protective shell 4, and a connecting arm 706 for connecting the first contact arm 703 with the second contact arm 704, the end of the second contact arm 704 is bent to form a contact head 705 that contacts the inner surface covering portion 405 of the side wall, and the first contact arm 703 is preset with a second snap-fitting protrusion 707 that cooperates with the snap-fitting groove 408 on the outer surface of the male socket protective shell 4. When the male connector is inserted into the female connector, the first snap-fit ​​protrusion 807, the second snap-fit ​​protrusion 707 and the contact head 705 can also fit into the snap-fit ​​groove 408, which greatly improves the reliability and contact stability of the connection between the female connector and the male connector, and through multi-point contact, the anti-electromagnetic interference performance of the connector can be further improved.

[0044] The above-mentioned embodiments only express the implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A board-to-board connector, characterized in that: It comprises a male connector and a female connector detachably electrically connected to the male connector, wherein the male connector comprises: The male insulating base (1) comprises a rectangular central slot (101) located in the middle, a pair of oppositely arranged long side walls (102) and a pair of oppositely arranged short side end walls (103); The male conductive terminal comprises a male signal terminal (2) and a male power terminal (3) embedded in two long side walls (102); The male seat protective shell (4) comprises an end wall outer side surface covering portion (403) covering the outer side surface of the short side end wall (103), the two ends of the end wall outer side surface covering portion (403) extending along the outer side surface of the long side side wall (102) to form a side wall outer side surface covering portion (406), the end of the side wall outer side surface covering portion (406) is horizontally bent inwardly to cover the inner side surface of the long side side wall (102) to form a side wall inner side surface covering portion (405), and the top of the side wall outer side surface covering portion (406) is bent downwardly to cover the long side The top surface of the side wall (102) forms a side wall top surface covering portion (404); the top of the end wall outer side surface covering portion (403) is bent downward to cover the top surface of the short side end wall (103) to form an end wall top surface covering portion (401); the end wall top surface covering portion (401) vertically extends downward to cover the inner side surface of the short side end wall (103) to form an end wall inner side surface covering portion (402); the lower end of the end wall inner side surface covering portion (402) extends horizontally toward the outside of the short side end wall (103) to form a reinforcing weld foot (407).

2. A board-to-board connector according to claim 1, characterized in that: The female connector comprises: A female insulating base (5) comprising a pair of oppositely arranged long side structures (502), a pair of oppositely arranged short side structures (503), and a central island structure (501) located in the middle of the female insulating base (5) and protruding upward; A female socket conductive terminal, comprising a female socket signal terminal (6) and a female socket power terminal (7) embedded in a female socket terminal groove between the long side structure (502) and the island structure (501); The female base protection shell (8) comprises an end protection portion covering the upper end of the female insulating base (5), a cap portion (806) covering the end of the island structure (501), and a connecting and fixing portion (809) located on the inner bottom surface of the female insulating base (5) and connecting the end protection portion and the cap portion (806) into one.

3. A board-to-board connector according to claim 2, characterized in that: The end protection portion comprises a top wall protection portion (801) which completely covers the top surface of the short side structure (503) and partially covers the top surface of the long side structure (502), an inner wall protection portion (802) which completely covers the inner side surface of the short side structure (503) and partially covers the inner side surface of the long side structure (502), an outer wall protection portion (803) which completely covers the outer side surface of the short side structure (503) and partially covers the outer side surface of the long side structure (502), an inner corner protection portion (804) which covers the inner corners of the short side structure (503) and the long side structure (502), and an outer corner protection portion (805) which covers the outer corners of the short side structure (503) and the long side structure (502).

4. A board-to-board connector according to claim 3, characterized in that: The connecting and fixing portion (809) is a horizontal inward extension of the bottom edge of the outer wall protection portion (803) on the outer side surface of the short side structure (503), and is integrally connected to the cap portion (806). Elastic contact portions (810) extending vertically upward are provided on both sides of the connecting and fixing portion (809).

5. The board-to-board connector according to claim 3, characterized in that: The connecting and fixing portion (809) is a horizontal inward extension of the bottom edge of the inner wall protection portion (802) on the inner side of the short side structure (503), and is integrally connected to the cap portion (806). The outer wall protection portion (803) on the outer side of the long side structure (502) is provided with an elastic abutment portion (814) that is bent inward and extends upward.

6. The board-to-board connector according to claim 2, characterized in that: A buckling groove (408) is also provided on the outer surface of the male seat protection shell (4), and correspondingly, a first buckling protrusion (807) is provided on the inner wall of the end protection portion.

7. The board-to-board connector according to claim 2, characterized in that: The female power terminal (7) is integrally bent and formed, and comprises a retaining portion (701) embedded in the female terminal groove, a terminal welding foot (702) extending toward the outside of the female insulating base (5), a first contact arm (703) extending toward the inside of the female insulating base (5) for contacting the outer side surface covering portion (406) of the side wall of the male protective shell (4), a second contact arm (704) for contacting the inner side surface covering portion (405) of the side wall of the male protective shell (4), and a connecting arm (706) for connecting the first contact arm (703) with the second contact arm (704), wherein the end of the second contact arm (704) is bent to form a contact head (705) for contacting the inner side surface covering portion (405) of the side wall.

8. The board-to-board connector according to claim 7, characterized in that: The first contact arm (703) is pre-set with a second buckling protrusion (707) that matches with a buckling groove (408) on the outer side of the male socket protective shell (4).

9. A board-to-board connector according to any one of claims 2 to 8, characterized in that: The male conductive terminal and the male protective shell (4) are both made of metal materials and are fixed together with the male insulating base (1) by means of inlay molding; the female conductive terminal and the female protective shell (8) are both made of metal materials and are fixed together with the male insulating base (1) by means of inlay molding.

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