Socket connectors, plug connectors and electrical connection devices

Abstract

A socket connector, a plug connector, and an electrical connection device are disclosed. The socket connector includes a metal housing, an insulating base, and a socket terminal assembly. The insulating base is disposed within the metal housing, is annular, and includes a socket opening. The socket terminal assembly is disposed within the insulating base and includes two terminal blocks, a protective base disposed between the two terminal blocks, and two socket terminal assemblies respectively mounted on the two terminal blocks. The protective base and the two socket terminal assemblies are spaced apart from each other. Each socket terminal assembly extends toward the socket opening but does not protrude from the protective base. The socket connector has the effect of preventing damage to the two socket terminal assemblies due to impact.

Description

Technical Field

[0001] This invention relates to a PCIe computer bus, and more particularly to a socket connector, a plug connector, and an electrical connection device. Prior Technology

[0002] Chinese patent application CN 117913566 A discloses an electrical connection device, including a receptacle connector and a plug connector detachably inserted into the receptacle connector. The receptacle connector includes a receptacle terminal assembly connected to a circuit board. The plug connector includes a plug terminal assembly detachably abutting against the receptacle terminal assembly.

[0003] The disadvantage of this existing electrical connection device is that during the insertion of the plug connector into the socket connector, the plug connector may collide with the socket terminal assembly or the socket connector may collide with the plug terminal assembly, causing deformation of the terminals of the socket terminal assembly or the plug terminal assembly. This results in poor contact between the terminals or failure of the terminals to make contact with each other, which needs to be further improved. Summary of the Invention

[0004] The purpose of this invention, the socket connector, is to improve upon at least one drawback of the prior art.

[0005] The present invention relates to a socket connector, comprising a metal housing, an insulating base, and a socket terminal assembly.

[0006] The insulating base is disposed within the metal housing, is annular in shape, and includes a receptacle opening. The receptacle terminal assembly is disposed within the insulating base and includes two terminal blocks, a protective seat disposed between the two terminal blocks, and two receptacle terminal groups respectively mounted on the two terminal blocks. The protective seat and the two receptacle terminal groups are spaced apart from each other. Each receptacle terminal group extends toward the receptacle opening but does not protrude from the protective seat.

[0007] The advantage of the socket connector of the present invention is that, since the protective base can prevent the two socket terminal groups from being impacted, the socket connector has the effect of avoiding damage to the two socket terminal groups.

[0008] The purpose of this invention is to improve at least one of the disadvantages of the prior art.

[0009] The present invention relates to a plug connector, comprising a plug housing unit and two plug terminal assemblies. The plug housing unit includes a housing wall defining a mating space and two first protective walls connected to the housing wall. The mating space includes a mating interface. The two first protective walls are located adjacent to the mating interface and extend towards each other to cooperate in defining an insertion port. Each plug terminal assembly includes an end. Each end is shielded by its respective first protective wall and is not exposed in the insertion port.

[0010] The advantage of this invention is that, since each of the first protective walls can prevent the end of each of the other plug terminal groups from being impacted, the plug connector has the effect of preventing damage to the two plug terminal groups.

[0011] The purpose of this invention is to improve at least one of the disadvantages of the prior art.

[0012] The present invention provides an electrical connection device comprising a socket connector as described above and a plug connector as described above. The plug connector is inserted into the socket connector.

[0013] The advantages of this invention are: the electrical connection device includes the aforementioned socket connector and the aforementioned plug connector, which can prevent the plug connector from colliding with each other when it is inserted into the socket connector, thus preventing damage to the two socket terminal groups and the two plug terminal groups. Simple Explanation of the Diagram

[0014] Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: Figure 1 is a perspective view illustrating the state in which a socket connector and a plug connector are inserted together in a first embodiment of the socket connector, plug connector and electrical connection device of the present invention. Figure 2 is a cross-sectional view illustrating the state in which the socket connector and the plug connector are inserted together; Figure 3 is an incomplete exploded 3D view, illustrating that the plug connector is separated from the socket connector; Figure 4 is an incomplete exploded perspective view illustrating the assembly relationship between the metal shell, insulating base, and socket terminal assembly of the socket connector; Figure 5 is a cross-sectional view illustrating the socket connector; Figure 6 is an exploded perspective view illustrating the assembly relationship between the two terminal blocks and the protective base of the socket terminal assembly, and also showing the structure of the two socket terminal groups; Figure 7 is a cross-sectional view illustrating the assembly relationship between the two terminal blocks and the protective base; Figure 8 is an incomplete exploded 3D view illustrating the plug connector; Figure 9 is a cross-sectional view illustrating the plug connector; Figure 10 is a bottom view illustrating the plug connector; Figure 11 is a cross-sectional view illustrating an assembly process of the socket connector and the plug connector; and Figure 12 is a cross-sectional view illustrating a second embodiment of the socket connector, plug connector, and electrical connection device of the present invention. Implementation

[0015] Referring to Figures 1 to 3, in one embodiment of the socket connector, plug connector and electrical connection device of the present invention, an electrical connection device 1 includes a socket connector 11 and a plug connector 12 that can be detachably plugged together.

[0016] Referring to Figures 3 to 5, the socket connector 11 is suitable for mounting on a circuit board 9 and includes a metal shell 131, an insulating base 132 covered by the metal shell 131, and a socket terminal assembly 14 disposed in the insulating base 132. The socket connector 11 is fixed to the circuit board 9 by being inserted into the metal shell 131.

[0017] The metal casing 131 is rectangular and includes several pins 131a located at the four corners. The metal casing 131 is inserted into the circuit board 9 via these pins 131a.

[0018] The insulating base 132 is enclosed and secured within the metal housing 131. The insulating base 132 is rectangular and can accommodate the aforementioned socket terminal assembly 14. The insulating base 132 includes a socket opening O1 that is opposite to the circuit board 9 and faces upward.

[0019] Referring to Figures 4 to 6, the socket terminal assembly 14 includes two terminal blocks 2 that are assembled together in a front-to-back direction D1 and extend left and right in a left-to-right direction D2, a protective seat 3 disposed between the two terminal blocks 2, and two socket terminal groups 5 respectively mounted on the two terminal blocks 2.

[0020] The thickness direction of each terminal block 2 is in the same direction as the front-rear direction D1. The plurality of terminal blocks 2 are respectively clamped on the front and rear opposite sides of the protective base 3 in the front-rear direction D1.

[0021] The two terminal blocks 2 include a plurality of first coupling portions 21 and a plurality of second coupling portions 22. The plurality of first coupling portions 21 and the plurality of second coupling portions 22 are arranged alternately in the left-right direction D2.

[0022] Each of the first mating portions 21 includes a first protrusion 211 and a first insertion block 212 located on one of the terminal blocks 2, and a first insertion hole 213 formed on the body of the other terminal block 2. The width of each first protrusion 211 is greater than the width of each of the first insertion blocks 212. Each of the first insertion holes 213 is for insertion of each of the first insertion blocks 212.

[0023] Each of the second mating portions 22 includes a second protrusion 221 and a second insert 222 located on one of the terminal blocks 2, a socket block 223 located on the other terminal block 2, and a second insertion hole 224 formed on the socket block 223. The width of each second protrusion 221 is greater than the width of each of the second insert blocks 222. Each socket block 223 can engage with each of the second protrusions 221. Each second insertion hole 224 is for insertion of each of the second insert blocks 222.

[0024] In other embodiments of the present invention, the constructions of each first joint 21 and each second joint 22 can be interchanged. Specifically, each first joint 21 may employ the design of the second protrusion 221, the second insert 222, the socket block 223, and the second socket 224, while each second joint 22 may employ the design of the first protrusion 211, the first insert 212, and the first socket 213.

[0025] In one embodiment, the first protrusion 211 of the first connecting portion 21 can be omitted, and the second protrusion 221 and the socket block 223 of the second connecting portion 22 can be omitted.

[0026] The protective base 3 is made of insulating material, and the protective base 3 and the two socket terminal groups 5 are located between the two socket terminal groups 5 at a distance from each other. The protective base 3 includes a base portion 31 disposed between the two terminal blocks 2, a base portion 32 integrally connected to the top of the base portion 31, and a flange portion 33 integrally protruding upward from the base portion 32 along a third direction D3.

[0027] The seat portion 31 includes a plurality of spaced-apart seats 311. The plurality of seats 311 define a plurality of engagement holes 312 and a plurality of spaces 313. Each of a plurality of seats 311 is square-ring shaped and defines the plurality of engagement holes 312 in the shape of square holes. Two of the plurality of seats 311 located on the left and right sides are block-shaped.

[0028] Each of the connecting holes 312 is for the insertion of the first protrusion 211 and the first insert 212 of each of the first connecting portions 21. Each of the intervals 313 is for the insertion of the second protrusion 221, the second insert 222, and the socket block 223 of each of the second connecting portions 22.

[0029] In other embodiments of the present invention, the plurality of second connecting portions 22 can be omitted because as long as the plurality of first connecting portions 21 are respectively inserted into the plurality of connecting holes 312, the protective seat 3 can be prevented from detaching from the two terminal seats 2. Furthermore, in other embodiments of the present invention, in addition to omitting the plurality of second connecting portions 22, the plurality of spacings 313 can also be omitted. For example, the seat feet 311 are integrally connected to each other. It can also be regarded as the seat foot portion 31 being a single long piece extending left and right, and having the plurality of connecting holes 312 formed therein.

[0030] Although the plurality of second coupling portions 22 and / or the plurality of intervals 313 may be omitted in the implementation of the present invention as described above, the advantage of including the plurality of second coupling portions 22 respectively inserted in the plurality of intervals 313 in this embodiment is that the plurality of second coupling portions 22 can cooperate to support the protective seat 3. Specifically, when the plug connector 12 is inserted into or removed from the socket connector 11, the plurality of second coupling portions 22 can not only disperse the stress borne by the base portion 32, but also cooperate with the plurality of first coupling portions 21 to limit the plurality of seat feet 311, thereby preventing deformation of the seat feet 31 and the base portion 32.

[0031] The base portion 32 is located between the two socket terminal groups 5 and abuts against the tops of the two terminal blocks 2. The base portion 32 includes two inclined surfaces 321 extending toward the socket opening O1 of the insulating base 132 facing each other, and bottom surfaces 322 located below the two inclined surfaces 321 respectively. The two bottom surfaces 322 abut against the tops of the two terminal blocks 2 respectively.

[0032] The flange portion 33 protrudes from the top of the base portion 32 toward the socket opening O1 of the insulating seat 132, extending the two socket terminal groups 5. The flange portion 33 includes a side seat surface 331 spaced back and forth along the front-rear direction D1 and extending along the third direction D3, a curved surface 332 connected to the top of the two side seat surfaces 331, and two end slopes 333 located at opposite ends of the curved surface 332 on the left and right directions D2.

[0033] The curved surface 332 bends and protrudes from the socket opening O1 of the insulating base 132, extending above the two socket terminal groups 5. The curved surface 332 includes a curved edge 332a located at the top on the third direction D3. The third direction D3 is in the same direction as the vertical direction. The two end slopes 333 extend toward the base portion 32 from opposite sides.

[0034] Each of the socket terminal groups 5 is embedded in a separate terminal block 2 through injection molding. Therefore, the separation of the two socket terminal groups 5 in Figure 6 is only for illustrating the structure of the two socket terminal groups 5 and does not represent the actual assembly relationship. Each socket terminal group 5 includes multiple signal terminals 5a and multiple ground terminals 5b.

[0035] Some of the multiple signal terminals 5a are used for high-speed signal transmission, while the others are used for low-speed signal transmission. The signal terminals 5a used for high-speed signal transmission are grouped in pairs, with grounding terminals 5b on both sides to prevent crosstalk between high-speed signal transmission terminals 5a in different groups. The signal terminals 5a used for low-speed signal transmission can be arranged continuously side-by-side.

[0036] Each of the multiple signal terminals 5a and multiple ground terminals 5b of the socket terminal group 5 cooperate to form a fixing part 51 extending vertically along the third direction D3, a contact part 52 located above and facing the socket opening O1 (see FIG5), and a soldering part 53 located below and suitable for electrical connection of the circuit board 9.

[0037] The contact portions 52 of the two socket terminal assemblies 5 extend upward toward the socket opening O1 towards each other. Each contact portion 52 is parallel to and spaced apart from the respective inclined surface 321 of the protective seat 3. Each contact portion 52 includes an end portion 521 located at the top on the third direction D3. Each end portion 521 is lower than the curved edge 332a of the protective seat 3. Alternatively, each socket terminal assembly 5 extends toward the socket opening O1 but does not protrude from the protective seat 3.

[0038] Referring to Figures 3, 8, and 9, the plug connector 12 includes a plug housing unit 15 and two plug terminal groups 16 disposed in the plug housing unit 15.

[0039] Referring to Figures 8 to 10, the plug housing unit 15 includes a bottom shell 61 and a cover shell 62 covering the bottom shell 61.

[0040] The bottom shell 61 includes a shell wall 63 and two first protective walls 64 connected to the shell wall 63.

[0041] The enclosure wall 63 includes two long wall portions 631 and two short wall portions 632. The two long wall portions 631 are spaced apart from each other along the front-rear direction D1. Each long wall portion 631 extends longitudinally along the left-right direction D2. The two short wall portions 632 are spaced apart from each other along the left-right direction D2. Each short wall portion 632 extends along the front-rear direction D1 and connects to the two long wall portions 631. The two long wall portions 631 and the two short wall portions 632 cooperate to define a mating space S1. The mating space S1 includes a mating interface O2 facing the socket connector 11.

[0042] Each of the first protective walls 64 is adjacent to the insertion interface O2. Specifically, each of the first protective walls 64 is located in the insertion space S1 and is close to the outer edge of the long wall portion 631 and the short wall portion 632 in the third direction D3. Each of the first protective walls 64 extends longitudinally in the left-right direction D2 and connects between the two short wall portions 632. The two first protective walls 64, by the two long wall portions 631 extending towards each other, cooperate to define an insertion port O3. The insertion port O3 is spaced apart from the insertion interface O2 in the third direction D3.

[0043] In addition to the first protective wall 64, in this embodiment, the shell enclosure 63 forms a second protective wall 65 at the portion between each first protective wall 64 and the insertion interface O2, and the two second protective walls 65 are respectively located on the two long wall portions 631.

[0044] Each of the first protective walls 64 includes a first wall surface 641 facing the plug-in interface O2, a second wall surface 642 opposite to the plug-in interface O2, and a wall edge 643 connecting the first wall surface 641 and the second wall surface 642 and facing the other first protective wall 64.

[0045] Each of the first wall surfaces 641 and each of the second wall surfaces 642 extend toward each other along the long wall portion 631 away from the shell wall 63.

[0046] The angle A1 between each of the second wall surfaces 642 and a wall surface of the shell enclosure 63 is an obtuse angle.

[0047] The two plug terminal groups 16 are arranged in the front-back direction D1. The width direction of each plug terminal group 16 is in the same direction as the left-right direction D2, and includes a fixing part 71 extending along the third direction D3, and a contact part 72 extending from the fixing part 71 to the respective first protective wall 64.

[0048] Each contact portion 72 includes an end 721 adjacent to the respective first protective wall 64. Each end 721 is shielded by the respective first protective wall 64 and is not exposed in the insertion port O3.

[0049] Referring to Figures 2, 3, and 11, the insertion method of the plug connector 12 into the socket connector 11 to form the electrical connection device 1 is shown in Figures 3 and 11. The shell wall 63 of the plug connector 12 is aligned with the socket opening O1 of the insulating seat 132 of the socket connector 11. The plug connector 12 is moved from top to bottom along the third direction D3, so that the two contact parts 72 abut against the two contact parts 52 respectively, and are thus opened by the two contact parts 52, until the shell wall 63 of the plug connector 12 abuts against the insulating seat 132 of the socket connector 11, that is, the insertion is completed.

[0050] The first feature of this embodiment is that when the plug connector 12 and the socket connector 11 are plugged into each other without alignment, the protective seat 3 of the socket connector 11 can prevent the bottom shell 61 of the plug connector 12 from hitting the two contact parts 52, while the two first protective walls 64 of the plug connector 12 can prevent parts other than the two socket terminal groups 5 in the socket connector 11 from hitting the two plug terminal groups 16.

[0051] Furthermore, since the two first protective walls 64 are adjacent to the two elongated wall portions 631 of the shell enclosure 63, or in other words, the two elongated wall portions 631 protrude from the two first protective walls 64 in the third direction D3, the portions of the two elongated wall portions 631 protruding from the two first protective walls 64 form a second protective wall 65, which can be regarded as the first layer of protection, while the two first protective walls 64 can be regarded as the second layer of protection. That is to say, this embodiment actually has the characteristics of dual protection.

[0052] Referring to Figures 9 to 11, a second feature of this embodiment is that the two opposite ends of the first protective wall 64 in the left-right direction D2 are respectively connected to the two short wall portions 632 of the shell enclosure 63 of the bottom shell 61. Therefore, the two first protective walls 64 have higher structural strength and can provide better protection. Furthermore, the first wall surface 641 and the second wall surface 642 of each first protective wall 64 extend towards each other in a direction away from the shell enclosure 63, so that the portion of each first protective wall 64 connecting to the respective long wall portion 631 is thicker, while the portion forming the respective wall edge 643 is thinner. In this way, the thicker portion of each first protective wall 64 can improve support, while the thinner portion can provide elastic cushioning when subjected to impact. Finally, the two edges 643 of the two first protective walls 64 can prevent the two socket terminal groups 5 of the socket connector 11 from being scratched by the two first protective walls 64 when the plug connector 12 is plugged into the socket connector 11.

[0053] Referring to Figures 2, 5, and 6, the third feature of this embodiment is that the two terminal blocks 2 and the protective base 3 are assembled together by snap-fit, which is beneficial for manufacturing. Specifically, the insulating base 132, the two terminal blocks 2, and the protective base 3 are all components that can be injection molded independently, rather than a single complex component, thus having the advantage of lower injection molding difficulty.

[0054] The fourth feature of this embodiment is that: the contact portion 52 of each socket terminal group 5 and the respective inclined surface 321 of the protective seat 3 are spaced apart to form a gap. This gap provides room for elastic deformation of each contact portion 52. In this way, when each contact portion 52 is pressed by the respective plug terminal group 16, each contact portion 52 can deform slightly and generate elastic force against the respective plug terminal group 16. That is to say, the design of each contact portion 52 and the respective inclined surface 321 being spaced apart can ensure that each contact portion 52 is tightly against the respective contact portion 72.

[0055] Referring to Figure 12, a second embodiment of the socket connector, plug connector, and electrical connection device of the present invention is similar to the first embodiment, except that the flange portion 33 of the protective seat 3 extends upward from the base portion 32 to the same height as the two ends 521 of the two socket terminal groups 5, but does not protrude from the two socket terminal groups 5 in the third direction D3. Alternatively, it can be seen that the two socket terminal groups 5 are at the same height as the curved edge 332a of the curved surface 332 of the protective seat 3, and do not protrude from the protective seat 3 in the third direction D3.

[0056] In this second embodiment, since the curved edge 332a is at the same height as the two ends 521, when the plug connector 12 (see FIG. 3) touches or impacts the two ends 521 with an inappropriate part, it will also come into contact with the curved edge 332a of the protective seat 3. In this way, by dispersing the impact force or contact pressure by the curved edge 332a, the probability of damage to the two socket terminal groups 5 can also be reduced.

[0057] In summary, the advantages of the socket connector, plug connector and electrical connection device of the present invention are as follows: In the socket connector 11, the protective seat 3 can prevent damage to the two socket terminal groups 5, and in the plug connector 12, the two first protective walls 64 and the second protective wall 65 can prevent damage to the two plug terminal groups 16, so that the electrical connection device 1 is less likely to be damaged.

[0058] The above description is merely an embodiment of the present invention and should not be construed as limiting the scope of the patent application of the present invention. Furthermore, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the patent specification of the present invention should also be covered by the scope of the patent application of the present invention.

[0059] 1: Electrical connection device 11: Socket Connector 12: Plug Connector 131: Metal casing 131a: Pin 132: Insulating base 14: Socket terminal assembly 15: Plug housing unit 16: Plug terminal block 2: Terminal block 21: First joint 211: First bump 212: First insert block 213: First socket 22: Second joint 221: Second bump 222: Second insert block 223: Socket Block 224: Second socket 3: Protective seat 31: Seat legs 311: Seat legs 312: Connecting hole 313: Interval 32: Base section 321: Incline 322: Bottom surface 33: Flanged portion 331: Side seat surface 332: Surface 332a: Curved edge 333:End bevel 5: Socket terminal block 5a: Signal terminal 5b: Grounding terminal 51: Fixing part 52:Contact Department 521: End 53: Welding section 61: Bottom shell 62: Cover 63: Shell wall 631: Longwall section 632: Short wall section 64: First protective wall 641: First wall 642: Second wall 643: Wall Edge 65: Second protective wall 71: Fixing part 72:Contact Department 721: End 9: Circuit board A1: Wall angle D1: Forward and backward direction D2: Left and right directions D3: Third direction O1: Socket O2: Socket O3: Insertion port S1: Insertion Space

Claims

1. A socket connector, comprising: a metal housing; an insulating base disposed within the metal housing and including a socket opening; and a socket terminal assembly disposed within the insulating base and including two terminal blocks, a protective base disposed between the two terminal blocks, and two socket terminal groups respectively mounted on the two terminal blocks, the protective base and the two socket terminal groups being spaced apart from each other, each socket terminal group extending toward the socket opening but not protruding from the protective base, wherein... The protective base includes two inclined surfaces extending toward the socket opening from opposite sides, each of the socket terminal groups including a contact portion facing the socket opening, the two contact portions extending toward the socket opening from opposite sides, and each inclined surface being spaced apart from the respective contact portion.

2. The socket connector as described in claim 1, wherein, The protective base includes a base portion located between the two socket terminal groups, and a flange portion protruding toward the socket opening from the two socket terminal groups.

3. The socket connector as described in claim 2, wherein, The flange includes a curved surface that bends and protrudes toward the socket.

4. The socket connector as described in claim 3, wherein, The flange also includes two end slopes located at opposite ends of the curved surface.

5. The socket connector as claimed in claim 1, wherein, The two terminal blocks include a plurality of first engagement portions that are coupled to the protective seat to bring the two terminal blocks together.

6. The socket connector as claimed in claim 5, wherein, The protective base has multiple mating holes, and the multiple first mating portions are located in the multiple mating holes.

7. The socket connector as described in claim 6, wherein, The protective seat includes multiple feet that define multiple mating holes.

8. The socket connector as claimed in claim 1, wherein, The protective base is made of insulating material.

9. A socket connector comprising: a metal housing; an insulating base disposed within the metal housing and including a socket opening; and a socket terminal assembly disposed within the insulating base and including two terminal blocks, a protective base disposed between the two terminal blocks, and two socket terminal groups respectively mounted on the two terminal blocks, the protective base and the two socket terminal groups being spaced apart from each other, each socket terminal group extending toward the socket opening but not protruding from the protective base, wherein... The two terminal blocks include a plurality of first engagement portions that are coupled to the protective seat to bring the two terminal blocks together.

10. A plug connector comprising: a plug housing unit including a housing wall defining a mating space, and two first protective walls connected to the housing wall, the mating space including a mating interface, the two first protective walls extending adjacent to the mating interface and facing each other to cooperate in defining an insertion port; and two plug terminal groups, each plug terminal group including an end, each end being shielded by a respective first protective wall and not exposed in the insertion port.

11. The plug connector as claimed in claim 10, wherein, The enclosure wall forms a second protective wall at the location between each of the first protective walls and the insertion interface.

12. The plug connector as claimed in claim 11, wherein, Each of the first protective walls extends in a left-right direction and connects to the shell enclosure wall. The shell enclosure wall has a pair of long wall portions that extend in the left-right direction and are spaced apart from each other. The two second protective walls are respectively located on the two long wall portions.

13. The plug connector as claimed in claim 11, wherein, Each of the first protective walls includes a first wall surface facing the plug interface, a second wall surface opposite to the plug interface, and a wall edge connecting the first wall surface and the second wall surface and facing another first protective wall, each of the ends being closer to the enclosure wall relative to the respective wall edge.

14. The plug connector as claimed in claim 13, wherein, The angle between each of the second wall surfaces and one of the walls of the shell is an obtuse angle.

15. The plug connector as claimed in claim 13, wherein, Each of the first walls and each of the second walls extends toward each other in a direction away from the shell wall.

16. An electrical connection device comprising: a receptacle connector including a metal housing; an insulating base disposed in the metal housing and including a receptacle opening; and a receptacle terminal assembly disposed in the insulating base and including two terminal blocks, a protective base disposed between the two terminal blocks, and two receptacle terminal groups respectively mounted on the two terminal blocks, the protective base and the two receptacle terminal groups being spaced apart from each other, each of the receptacle terminal groups extending toward the receptacle opening but not protruding from the protective base; a plug connector detachably pluggable to the receptacle connector, and including a plug housing unit including a housing wall defining a mating space, and two first protective walls connected to the housing wall, the mating space including a mating interface, the two first protective walls being adjacent to the mating interface and extending toward each other to cooperate in defining an insertion port; and two plug terminal groups, each of the plug terminal groups including an end, each end being shielded by a respective first protective wall and not exposed in the insertion port.

17. The electrical connection device as claimed in claim 16, wherein, The protective housing of the socket connector includes a base portion located between the two socket terminal groups and a flange portion protruding toward the socket opening from the two socket terminal groups.

18. The electrical connection device as claimed in claim 16, wherein, The two terminal blocks of the socket connector include a plurality of first mating portions that are engaged with the protective housing to bring the two terminal blocks together.

19. The electrical connection device as claimed in claim 18, wherein, The protective base of the socket connector has multiple mating holes, and the multiple first mating portions are located in the multiple mating holes.

20. The electrical connection device as claimed in claim 16, wherein, The housing wall of the plug connector forms a second protective wall at the location between each of the first protective walls and the plug interface.

21. The electrical connection device as claimed in claim 20, wherein, Each of the first protective walls extends in a left-right direction and connects to the shell enclosure wall. The shell enclosure wall has a pair of long wall portions that extend in the left-right direction and are spaced apart from each other. The two second protective walls are respectively located on the two long wall portions.

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