CN113131272B - Electric connector assembly - Google Patents

Abstract

The invention discloses an electric connector assembly, which comprises an electric connector and a butt joint connector matched with the electric connector, wherein the electric connector comprises a plurality of first grounding plates which are transversely arranged, the butt joint connector comprises a plurality of terminal modules which are transversely arranged, each terminal module comprises a first grounding plate which is transversely arranged and is positioned on a first side of the terminal module, and a second grounding plate which is positioned on a second side opposite to the first side, and each first grounding plate is mechanically and electrically connected with the grounding plates on the adjacent sides of two adjacent terminal assemblies.

Description

Electric connector assembly

[ field of technology ]

The present invention relates to an electrical connector assembly, and more particularly to an electrical connector assembly having a ground shield.

[ background Art ]

Chinese patent No. CN102904119 issued to publication No. 2016-06-08 discloses an electrical connector assembly comprising an electrical connector and a mating connector, wherein the electrical connector comprises signal terminals and a grounding plate for shielding the signal terminals, the mating connector comprises a plurality of terminal modules arranged transversely, each of the terminal modules comprises a first grounding plate arranged transversely on a first side thereof and a second grounding plate arranged on a second side opposite to the first side thereof, the grounding plate is mechanically and electrically connected with the grounding plate of the same terminal module, and the adjacent terminal modules may have crosstalk problems, so that the shielding effect is not ideal. The transmission speed per channel of the first electrical connector 1 and the second electrical connector 2 may reach 112Gbps or higher.

[ invention ]

The technical problems to be solved by the invention are as follows: an electrical connector assembly is provided that has a good grounding effect.

In order to solve the above-mentioned problems, the present invention provides an electrical connector assembly, which includes an electrical connector and a mating connector that mates with the electrical connector, the electrical connector includes a plurality of first grounding plates disposed transversely, the mating connector includes a plurality of terminal modules disposed transversely, each of the terminal modules includes a first grounding plate disposed transversely on a first side thereof and a second grounding plate disposed on a second side opposite to the first side thereof, and each of the first grounding plates is mechanically and electrically connected to the grounding plates on adjacent sides of two adjacent terminal assemblies.

Compared with the prior art, the grounding piece of the electric connector assembly is mechanically and electrically connected with the grounding piece of the adjacent terminal module of the butt joint connector, so that the shielding effect between the adjacent terminal modules is improved, and better conditions are provided for stable transmission of high-frequency signals.

[ description of the drawings ]

Fig. 1 is a perspective view of a first electrical connector and a mating second electrical connector of a connector assembly consistent with the present invention.

Fig. 2 is a perspective view of the first electrical connector and the second electrical connector shown in fig. 1 before mating.

Fig. 3 is a perspective view of the first electrical connector and the second electrical connector shown in fig. 2 from another perspective before mating.

Fig. 4 is a partially exploded view of the first electrical connector shown in fig. 1.

Fig. 5 is a combination view of the first and second ground tabs of the first electrical connector of fig. 4.

Fig. 6 is a partially exploded view of the first electrical connector terminal assembly of fig. 4.

Fig. 7 is a top view of the first electrical connector of fig. 1.

Fig. 8 is a partially exploded view of the second electrical connector shown in fig. 1.

Fig. 9 is a partially exploded view of the terminal module of the second electrical connector shown in fig. 8.

Fig. 10 is another view of the terminal module of fig. 9.

Fig. 11 is a further exploded view of the terminal module shown in fig. 9.

Fig. 12 is another view of the terminal module of fig. 11.

Fig. 13 is a perspective view of a signal terminal of the terminal module shown in fig. 11.

Fig. 14 is a perspective view of the interengagement between portions of the signal terminals and portions of the ground shield of the connector assembly of fig. 1.

Fig. 15 is a cross-sectional view taken along A-A of the connector assembly of fig. 1 in a mated condition.

Fig. 16 is a cross-sectional view taken along the direction B-B of the connector assembly of fig. 1 in a mated state.

Fig. 17 is an enlarged view of a portion of the connector assembly of fig. 14 in a mated condition.

Fig. 18 is an enlarged view of a portion of the connector assembly of fig. 15 in a mated condition.

[ Main reference numerals Specification ]

First electrical connector 1 and second electrical connector 2

First circuit board 3 second circuit board 4

Insulation housing 10 straight terminal 20

First grounding plate 31 of shielding cavity 33

Bottom wall 11 of second grounding plate 32

Side wall 12 accommodating space 13

Mounting hole 111 of connector assembly 100

Guide groove 121 of mounting slot 112

Holder 210 mounting portion 211

Butt joint 213 fixing block 22

First fixing portion 310 and first mounting portion 311

First abutting portion 313 flat plate portion 315

Second holding portion 320 of contact spring 319

Second mounting portion 321 second docking portion 323

Second grounding leg 327 of first grounding leg 317

First slot 318 and second slot 328

Resisting part 329 terminal module 40

Holder 60 signal terminal 71

First ground plate 91 of ground terminal 81

Second ground plate 92 signal terminal pair 710

First insulator 72 second insulator 50

Signal terminal assembly 70 ground terminal assembly 80

Butt end 73 mounting end 74

Middle portion 75 first corbel 732

Second corbel 733 body 731

First contact bump 701 and second contact bump 702

Third contact bump 703 first signal terminal 711

Second signal terminal 712 air gap 721

Lower edge 51 upper edge 52

Leading edge 53 trailing edge 54

Retaining bead 521,541,542 back wall 601

Upper wall 602 retaining groove 610,611,620

First side 56 of the flange 512,522

Second side 57 mounting groove 560

Recess 562 projection 563

Ground mating end 83 and ground mounting end 84

Intermediate region 85 first mounting frame 561

The second mounting frame 571 hole 565

Slit 902 contacts tab 901

First flat plate portion 910 first contact portion 911

First mounting leg 913 and second plate 920

Second contact 921 second mounting foot 923

First aperture 917 of contact plate 851

Second aperture 927

[ detailed description ] of the invention

As shown in fig. 1-17, the connector assembly 100 of the present invention includes a first electrical connector 1 and a second electrical connector 2 mated with the first electrical connector 1, the first electrical connector 1 being mounted on a first circuit board 3 and the second electrical connector 2 being mounted on a second circuit board 4. The transmission speed per channel of the first electrical connector 1 and the second electrical connector 2 may reach 112Gbps or higher.

The first electrical connector 1 comprises an insulating housing 10, a plurality of dc terminals 20 mounted on the insulating housing 10, a plurality of first grounding plates 31 fixedly held on the insulating housing 10 in a transverse direction, and a plurality of second grounding plates 32 fixedly held on the insulating housing 10 in a longitudinal direction. The plurality of first ground tabs 31 and the plurality of second ground tabs 32 are interdigitated to form a plurality of shielded cavities 33 spaced apart from one another, with the straight terminals 20 being distributed in the respective shielded cavities 33.

The insulating housing 10 includes a bottom wall 11 and a pair of side walls 12 extending from the same side of the bottom wall 11 and disposed at intervals, and the bottom wall 11 and the two side walls 12 together enclose a housing space 13. The bottom wall 11 includes a plurality of mounting holes 111 arranged in rows and columns penetrating the bottom wall 11 for mounting the dc terminals 20 and mounting slits 112 arranged in columns for mounting the second grounding plate 32. The side wall 12 is provided with a guide groove 121 for guiding the second electric connector 2 to be accurately inserted into the accommodating space 13.

The straight terminals 20 are mounted on the bottom wall 11 of the insulating housing 10 in an array of rows and columns, and the straight terminals 20 are signal terminals for transmitting signals and are arranged as terminal pairs for transmitting a pair of differential signals. Each pair of the straight terminals 20 is located in a corresponding one of the shielded cavities 33. Each pair of the straight terminals 20 includes a holding portion 210 for mounting on the bottom wall 11, a mounting portion 211 extending downward from the holding portion 210 to extend downward from the bottom wall 11 for mounting on the first circuit board 3, and a docking portion 213 extending upward from the holding portion 210 into the accommodating space 13. The first electrical connector 1 further includes a fixing block 22 integrally formed on the holding portion 210 of the pair of straight terminals 20, and the mounting hole 111 on the bottom wall 11 cooperates with the fixing block 22 to fix the pair of straight terminals 20 to the bottom wall 11. Of course, the fixed block 22 may not be required to directly mount the dc terminal 20 to the bottom wall 11.

The first grounding plate 31 and the second grounding plate 32 are made of sheet metal, a plurality of the first grounding plates 31 are parallel to each other, and a plurality of the second grounding plates 32 are parallel to each other. The first grounding plates 31 are integrally formed in the insulating housing 10, and the second grounding plates 32 are assembled in the insulating housing 10. In the preferred embodiment, the plurality of first grounding plates 31 and the plurality of second grounding plates 32 are disposed perpendicularly to each other. Each of the first grounding plates 31 includes a first holding portion 310 integrally formed on the bottom wall 11, a first mounting portion 311 extending downward from the first holding portion 310 for electrically connecting with the first circuit board 3, and a first abutting portion 313 extending upward from the first holding portion 310 into the accommodating space 13. The first abutting portion 313 includes a plate portion 315 and a plurality of contact spring pieces 319 extending from the plate portion 315. The contact spring 319 is integrally formed by punching from the flat plate portion 315, and is bent out of the plane of the flat plate portion 315. The second grounding plate 32 includes a second holding portion 320 mounted on the bottom wall 11, a second mounting portion 321 extending downward from the second holding portion 320 for mounting on the first circuit board 3, and a second abutting portion 323 extending upward from the second holding portion 320 into the accommodating space 13. The first mating portion 313 extends into the accommodating space 13 to a size greater than the size of the mating portion 213 of the straight terminal 20 extending into the accommodating space 13, and the second mating portion 323 extends into the accommodating space 13 to a size smaller than the size of the mating portion 213 of the plug terminal extending into the accommodating space 13. The first mounting portion 311 includes a plurality of first grounding pins 317, the second mounting portion 321 includes a plurality of second grounding pins 327, and the number of the second grounding pins 327 is at least three times that of the first grounding pins 317. When the first electrical connector 1 is assembled, one first grounding pin 317 is disposed on each of two sides of the mounting portion 211 of each pair of straight terminals 20 in the transverse direction, and a plurality of second grounding pins 327 are disposed on each of two sides of the first electrical connector in the longitudinal direction. The first holding portion 310 is provided with a plurality of first clamping grooves 318 with downward openings, the second abutting portion 323 is provided with a plurality of second clamping grooves 328 with upward openings, and the first grounding plate 31 and the second grounding plate 32 are mutually clamped with the second clamping grooves 328 through the first clamping grooves 318. The two sides of the second holding portion 320 of the second grounding plate 32 are respectively provided with a resisting portion 329, and the resisting portion 329 is used for limiting the insulating housing 10 when the second grounding plate 32 is installed from bottom to top, so as to ensure that the second grounding plates 32 inserted into the bottom wall 11 are installed to a predetermined position.

The signal transmission straight terminal 20 of the first electric connector 1 is shielded by the first grounding piece 31 and the second grounding piece 32 in the circumferential direction, so that the shielding effect of the first electric connector 1 is improved, the first grounding piece 31 is integrally formed with the insulating shell 10, and the insulating shell 10 is assembled by the second grounding piece 32, so that the insulating shell 10 is simple and reliable in structure, and better conditions are provided for stable transmission of high-frequency signals.

The second electrical connector 2 includes a plurality of terminal modules 40 stacked in a transverse direction and a holder 60 for fixing the plurality of terminal modules 40 together, wherein each terminal module 40 includes an insulative housing, a plurality of signal terminals 71 held in the insulative housing, a plurality of ground terminals 81 held in the insulative housing, and a first ground plate 91 and a second ground plate 92 on opposite sides of the terminal module 40.

The insulator includes a plurality of first insulator bodies 72 holding signal terminals 71 and a second insulator body 50 holding ground terminals 81, the signal terminals 71 and the ground terminals 81 being electrically conductive terminals, each of the first insulator bodies 72 holding a pair of signal terminals 71 to form a signal terminal assembly 70, and each of the second insulator bodies 50 holding a plurality of ground terminals 81 to form a ground terminal assembly 80. A pair of signal terminals 71 are integrally formed in the first insulating body 72. A plurality of ground terminals 81 are integrally formed in the second insulating body 50.

The signal terminals 71 are arranged in the form of signal terminal pairs 710, each pair of signal terminals 71 is configured to transmit a pair of differential signals, the differential signal terminal pairs 710 and the ground terminals 81 are arranged at intervals in the vertical direction in the same terminal module 40, each signal terminal 71 includes a wide side and a narrow side, and each ground terminal 81 includes a wide side and a narrow side. The size of the broadsides of the ground terminals 81 is larger than the size of the broadsides of the signal terminals 71. The broadsides of the signal terminal pairs 710 are disposed in the same plane, and the broadsides of the ground terminals 81 are disposed in a plane intersecting the plane of the differential signal terminal pairs 710, and preferably each ground terminal 81 is disposed in a plane perpendicular to the plane of the differential signal terminal pairs 710.

Each of the signal terminals 71 includes a mating end 73 extending out of the first insulating body 72 in the mating direction, a mounting end 74 extending out of the first insulating body 72 in the mounting direction, and an intermediate portion 75 between the mounting end 74 and the mating end 73. The docking end 73 is perpendicular to the mounting end 74. A plurality of the signal terminals 71 are all narrow-side coupled from the mounting end 74 to the mating end 73. The mating end 73 includes a body 731 and a pair of support beams extending from the body 731 in a mating direction, wherein the first support beam 732 includes a first contact portion and the second support beam 733 includes a second contact portion, the body 731 includes a third contact portion, the first contact portion includes a first contact bump 701, the second contact portion includes a second contact bump 702, the third contact portion includes a third contact bump 703, the first contact bump 701 and the second contact bump 702 are arranged in a first direction, i.e., a column-wise upper arrangement, and the third contact bump 703 is arranged in a direction perpendicular to the first direction and opposite to the mating direction with respect to the first contact bump 701 and the second contact bump 702, such that when the second electrical connector 2 is mated with the first electrical connector 1, the first contact bump 701 and the second contact bump 702 are mated with the first electrical connector 1 with respect to the third contact bump 703. The area of the third contact bump 703 is larger than the sum of the areas of the first contact bump 701 and the second contact bump 702. The heights of the first contact bump 701 and the second contact bump 702 are the same, and the height of the third contact bump 703 is smaller than the heights of the first contact bump 701 and the bump. The first contact bump 701 and the second contact bump 702 are bent from the first support beam 732 and the second support beam 733 along a third direction perpendicular to the first direction and the second direction, the third contact bump 703 is punched from the body 731, and the first contact bump 701, the second contact bump 702 and the third contact bump 703 are all protruding toward the third direction. The first contact bump 701 and the second contact bump 702 protrude in the entire first direction of the first and second corbels 732 and 733, and the periphery of the third contact bump 703 is enclosed in the body 731. When the signal terminal 71 is mated with the dc terminal 20 of the first electrical connector 1, the three contact bumps are in contact with the dc terminal 20, so that there are two contact points in front and back along the mating direction, a front contact formed by the first contact bump 701 and the second contact bump 702, which are located relatively forward in the mating direction, and a rear contact formed by the third contact bump 703, which is located relatively backward, and the front contact and the rear contact are in contact with respect to one contact, thereby effectively solving the influence of the capacitive effect of single-point contact on impedance matching in the high-speed signal transmission process, improving the impedance matching property after interconnection, and improving the insertion loss.

Each pair of signal terminals 71 includes a first signal terminal 711 and a second signal terminal 712, where the length of the first signal terminal 711 is greater than the length of the second signal terminal 712, and in this embodiment, an air gap 721 exposing the first signal terminal 711 and the second signal terminal 712 to air is provided on the first insulating body 72, and the air gap 721 may be continuous or may be spaced. The length of the first signal terminal 711 exposed to the air gap 721 is greater than the length of the second signal terminal 712 exposed to the air gap 721. The air gap 721 may be provided only on one side of the first insulating body 72, or may be provided on both sides of the first insulating body 72.

The second insulating body 50 is in a sheet shape, and includes a lower edge 51 disposed toward the second circuit board, an upper edge 52 opposite to the lower edge 51, and a front edge 53 and a rear edge 54 connecting the upper edge 52 and the lower edge 51. The upper edge 52 is provided with a clamping rib 521, the rear edge 54 is provided with a clamping rib 541 and a clamping rib 542, the retainer 60 comprises a rear wall 601 and an upper wall 602 which are matched with each other in an extending manner along the rear edge 54 and the upper edge 52 of the second insulating body 50, the rear wall 601 is provided with a clamping groove 610 for accommodating the corresponding clamping rib 541 and a clamping groove 611 for accommodating the corresponding clamping rib 542 in a penetrating manner, and the clamping groove 611 can extend from the rear wall 601 to the upper wall 602 or can be arranged only on the rear wall 601; the upper wall 602 is provided with a holding groove 620 for receiving the holding rib 521 of the corresponding upper edge 52, and the holding groove 620 is opened forward and arranged on the holder 60 in a lateral array together with the other holding grooves 610 and 611 to hold one second insulating body respectively, so that each terminal module 40 can be fixed as one body by the holder 60 in a lateral alignment _。 The second insulating body 50 is further provided with a clamping edge 512 and a clamping edge 522 on the lower edge 51 and the upper edge 52, respectively, and the clamping edge 512 and the clamping edge 522 are used for guiding the second electric connector 2 to align with the guiding groove 121 on the first electric connector 1.

The second insulating body 50 has a first side 56 and a second side 57 which are disposed opposite to each other in the thickness direction thereof, the first side 56 is provided with a mounting groove 560 and a plurality of grooves 562 penetrating the mounting groove 560, the mounting groove 560 is recessed from the first side 56 into the second insulating body 50 from the front edge 53 into the second insulating body 50, and the grooves 562 are recessed from the first side 56 into the second insulating body 50 and extend from the mounting groove 560 to the lower edge 51. The grooves 562 have substantially the same shape as the length and width of the first insulating body 72, and each groove 562 is configured to receive and fix the first insulating body 72 of the pair of signal terminals 71. The second insulating body 50 includes protrusions 563 located on both sides of each groove 562, and each ground terminal 81 is located in a corresponding one of the protrusions 563. So that both sides of each of the differential signal terminal pairs 710 in the vertical direction are provided with the ground terminals 81. The ground terminals 81 include a ground mating end 83 that mates with the first electrical connector 1, a ground mounting end 84 that is mounted on the second circuit board, and an intermediate region 85 between the ground mounting end 84 and the ground mating end 83, the ground mounting end 84 extending beyond the mounting ends 74 of the signal terminals 71, and the ground mating end 83 extending beyond the mating ends 73 of the signal terminals 71 in a mating direction such that the signal terminals are shielded circumferentially across the transmission path. The width dimension of the grounding middle region 85 of the grounding terminal 81 is larger than the dimension from the second side to the first side of the second insulating body 50, so that both sides of the width of the middle region 85 are exposed from the second side 57 of the second insulating body 50 and the corresponding sides of the protrusion 563, and the middle region 85 includes a contact piece 851 extending further to both sides. The mating ends 73 of the signal terminals 71 and the ground mating ends 83 of the ground terminals are received in the mounting slots 560 in cantilever fashion for mating with the straight terminals 20 on the first electrical connector 1.

The first grounding plate 91 is disposed on the first side 56 of the second insulating body 50, the second grounding plate 92 is disposed on the second side 57 opposite to the first side 56, the second insulating body 50 is provided with a first mounting frame 561 for mounting the first grounding plate 91 and a second mounting frame 571 for mounting the second grounding plate 92, the first mounting frame 561 has the same outline as the first grounding plate 91, the second mounting frame 571 has the same outline as the second grounding plate 92, the first mounting frame 561 is recessed from the first side 56 of the second insulating body 50 to the second insulating body 50, the second mounting frame 571 is recessed from the second side 57 of the second insulating body 50 to the second insulating body 50, the thickness of the first grounding plate 91 is not greater than the depth of the first mounting frame 561, the thickness of the second grounding plate 92 is not greater than the depth of the second mounting frame 571, preferably the depth of the first mounting frame 561 is the same as the depth of the first grounding plate 91, the second mounting frame 561 has the same depth as the depth of the second grounding plate 92, and the second grounding plate 92 has the same thickness as the second grounding plate 92 is the second insulating body 50, and each time the second grounding plate 92 is mounted on the same thickness as the second insulating body 50. The first mounting frame 561 is further provided with a hole 565, and the hole 565 penetrates the first side 56 and the second side 57 of the second insulating body 50, and is generally slit-shaped. The second ground plate 92 is provided with a slot 902, and the first ground plate 91 includes a contact tab 901, and the contact tab 901 extends through the hole 565 and mates with the slot 902 to mechanically and electrically connect the first ground plate 91 and the second ground plate 92.

The first ground plate 91 includes a first flat plate portion 910, a first contact portion 911 extending from the first flat plate portion 910 in a mating direction, and a first mounting leg 913 extending from the first flat plate portion 910 in a circuit board direction, the second ground plate 92 includes a second flat plate portion 920, a second contact portion 921 extending from the second flat plate portion 920 in the mating direction, and a second mounting leg 923 extending from the second flat plate portion 920 in the circuit board direction, and the length of the first contact portion 911 extending in the mating direction is greater than the length of the second contact portion 921 extending in the mating direction. The first contact portion 911 is closer to the second insulating body 50 than the first flat plate portion 910, and the second contact portion 921 is in the same plane as the second flat plate portion 920, so the first contact portion 911 is also closer to the second contact portion 921. So that when the terminal modules 40 are assembled together, the distance between the first contact portion 911 and the second contact portion 921 of the adjacent first ground plate 91 and second ground plate 92 of two adjacent terminal modules 40 is larger than the distance between the first flat plate portion 910 and the second flat plate portion 920, so that the first abutting portion 313 of the first ground plate 31 of the first electrical connector 1 can extend between the first contact portion 911 and the second contact portion 921 and mechanically and electrically connect with both the first contact portion 911 and the second contact portion 921, wherein the flat plate portion 315 of the first abutting portion 313 is engaged with the second contact portion 921, and the contact spring piece 319 is engaged with the first contact portion 911 in a contact manner. The first plate portion 910 includes a first aperture 917 that mates with a contact tab 851 of the ground terminal 81, and the second plate portion 920 includes a plurality of second apertures 927 that mate with a contact tab 851 on a second side of the ground terminal 81. Of course, it is also possible that one of the first ground plate 91 or the second ground plate 92 is in contact with the ground terminal. The ground terminals 81, the first ground plate 91 and the second ground plate 92 cooperate to form a shielding channel with a closed periphery, so that the signal terminals 71 in the channel are completely shielded in the circumferential direction along the entire transmission path, and the crosstalk effect between the signal terminals 71 is reduced to an optimal state, so as to achieve the purpose of reducing the signal crosstalk between the signal terminals in each pair, and achieve higher-speed signal transmission.

When the first electrical connector 1 and the second electrical connector 2 are mated, each pair of the straight terminals 20 and the corresponding signal terminals 71 are mated with each other to form a pair of signal paths, the first grounding plate 31 is mechanically connected with the adjacent first grounding plate 91 and the second grounding plate 92 of the adjacent two terminal modules, and the second grounding plate 32 and the grounding terminal 81 are mated with each other to form a complete shielding of the straight terminals 20 and the signal terminals 71 of the pair of signal paths in the circumferential direction on the whole transmission path, so that the effect of shielding electromagnetic crosstalk is better. And the structure is simple and reliable, and better conditions are provided for stable transmission of high-frequency signals.

The foregoing is merely one embodiment, not all or a mere embodiment, and any equivalent variations on the technical solution of the present invention by those skilled in the art through reading the specification of the present invention are covered by the claims of the present invention.

Claims (9)

1. An electric connector assembly, its includes electric connector and the butt joint connector that mutually supports with electric connector, electric connector is including a plurality of first earthing strips that transversely set up, butt joint connector includes a plurality of terminal modules that transversely set up, every terminal module is including the first earthing plate that transversely set up that is located its first side and the second earthing plate that is located the second side opposite with first side, its characterized in that: the first grounding plate is mechanically and electrically connected with the grounding plates on the adjacent sides of the two adjacent terminal modules, each terminal module comprises signal terminals and grounding terminals which are arranged at intervals in the vertical direction, the signal terminals are arranged in the same plane, the grounding terminals are located in a plane perpendicular to the same plane, and the first grounding plate and the second grounding plate of the same terminal module are combined with the grounding terminals to completely shield a pair of signal terminals from the circumferential direction.

2. The electrical connector assembly of claim 1, wherein: after the electric connector and the butt connector are matched with each other, the first grounding piece is positioned between the first grounding plate and the second grounding plate on the adjacent sides of the two adjacent terminal modules.

3. The electrical connector assembly of claim 2, wherein: the first grounding plate of each terminal module comprises a first flat plate part and a first contact part extending from the first flat plate part, and the second grounding plate comprises a second flat plate part and a second contact part extending from the second flat plate part, wherein the first contact part is closer to the second grounding plate relative to the first flat plate part.

4. An electrical connector assembly as in claim 3 wherein: the length of the first contact part extending towards the butt joint direction is longer than that of the second contact part extending along the butt joint direction.

5. The electrical connector assembly of claim 4, wherein: the first grounding piece comprises a first butt joint part, the first butt joint part comprises a flat plate part and a plurality of contact spring pieces protruding from the flat plate part, the flat plate part is in contact fit with the second contact parts on the adjacent sides of the two adjacent terminal modules, and the contact spring pieces are in contact fit with the first contact parts on the adjacent sides of the two adjacent terminal modules.

6. The electrical connector assembly of claim 2, wherein: the electric connector further comprises an insulating body, a plurality of signal terminals fixed in the insulating body and a plurality of second grounding plates fixed in the insulating body, wherein the first grounding plates are mutually perpendicular to the second grounding plates, the first grounding plates and the second grounding plates shield each signal terminal from the circumferential direction, and the second grounding plates are mechanically and electrically connected with the grounding terminals of all terminal modules.

7. The electrical connector assembly of claim 6, wherein: the terminal module further includes an insulating housing in which the signal terminals and the ground terminals in the terminal module are held.

8. The electrical connector assembly of claim 7, wherein: the second grounding piece is mechanically and electrically connected with the grounding terminal.

9. The electrical connector assembly of claim 8, wherein: the first grounding plate and the second grounding plate of the same terminal module are mechanically and electrically connected, and at least one of the first grounding plate and the second grounding plate is mechanically and electrically connected with a grounding terminal.