TW202130056A - Electrical connector assembly - Google Patents

Abstract

An electrical connector assembly, which includes an electrical connector, the electrical connector includes a plurality of first grounding sheets arranged laterally, and a mating connector, which cooperates with the electrical connector, the mating connector includes a plurality of laterally arranged terminal modules, each terminal module includes a first ground plate on a first side of the terminal module and a second ground plate on a second side of the terminal module opposite to the first side, wherein, the first ground sheet is mechanically and electrically connected to the ground plates on the adjacent sides of the two adjacent terminal modules.

Description

Electrical connector assembly

The invention relates to an electrical connector assembly, in particular to an electrical connector assembly with a grounding shield.

China Patent No. CN102904119, authorized and announced on June 8, 2016, discloses an electrical connector assembly, which includes an electrical connector and a mating connector that cooperate with each other, and the electrical connector includes a signal terminal and a shielding signal terminal. A grounding plate, the docking connector includes a plurality of laterally arranged terminal modules, and each of the terminal modules includes a laterally arranged first ground plate on a first side thereof and a second side opposite to the first side However, the grounding plate is only mechanically and electrically connected to the grounding plate of the same terminal module. The adjacent terminal module components may have crosstalk problems and the shielding effect is not ideal. Therefore, an improvement is needed Electrical connector.

Therefore, it is necessary to provide a design of a new electrical connector assembly to overcome the above-mentioned problems.

The purpose of the present invention is to provide an electrical connector assembly with good grounding effect.

The object of the present invention is achieved by the following technical solutions: an electrical connector assembly, which includes: an electrical connector, the electrical connector includes a plurality of first grounding plates arranged laterally; and a butt connector, the butt connector Mutually cooperate with the electrical connector, the mating connector includes a plurality of laterally arranged terminal modules, each of the terminal modules includes: a first ground plate, the first ground plate is located in the terminal module And a second ground plate, the second ground plate is located on the second side of the terminal module opposite to the first side, wherein the first ground plate and adjacent two terminal assemblies The ground plates on the adjacent sides are mechanically and electrically connected.

Compared with the prior art, the present invention improves the shielding effect between adjacent terminal modules by mechanically and electrically connecting the grounding plate of the electrical connector with the grounding plate of the adjacent terminal module of the mating connector at the same time. It provides better conditions for the stable transmission of high-frequency signals.

Please refer to Figures 1 to 18, a connector assembly 100, which includes a first electrical connector 1 and a second electrical connector 2 mated with the first electrical connector 1. The first electrical connector 1 is mounted on the first circuit board 3, and the second electrical connector 2 is mounted on the second circuit board 4. The transmission rate per channel of the first electrical connector 1 and the second electrical connector 2 can reach 112 Gbps or higher.

The first electrical connector 1 includes an insulating housing 10, a plurality of straight terminals 20 mounted on the insulating housing 10, and a plurality of first grounding strips 31 and a plurality of edges fixed on the insulating housing 10 in the transverse direction. The second ground plate 32 fixed on the insulating housing 10 is longitudinally fixed. The plurality of first ground plates 31 and the plurality of second ground plates 32 cross each other to form a plurality of shield cavities 33 separated from each other, and the straight terminals 20 are distributed in the corresponding shield 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 spaced apart from each other. The bottom wall 11 and the two side walls 12 jointly enclose a receiving space 13. The bottom wall 11 includes a plurality of mounting holes 111 which penetrate the bottom wall 11 in rows and columns for mounting the straight terminals 20 and mounting slots 112 which are arranged in rows to install the second grounding strips 32. The side wall 12 is provided with a guiding groove 121 for guiding the second electrical connector 2 to be accurately inserted into the accommodating space 13.

The straight terminals 20 are arrayed on the bottom wall 11 of the insulating housing 10 in several rows and several columns. The straight terminals 20 are signal terminals for transmitting signals and are arranged as a terminal pair. Transmit a pair of differential signals. Each pair of the straight terminals 20 is located in a corresponding shield cavity 33. Each pair of the straight terminals 20 includes a holding portion 210 for mounting on the bottom wall 11, and a mounting portion 211 for mounting on the first circuit board 3 and a mounting portion 211 extending downward from the holding portion 210 of the bottom wall 11 to be mounted on the first circuit board 3. The holding portion 210 extends upward into the docking portion 213 of the receiving 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 and the fixing block 22 cooperate with each other to make the pair of straight terminals The terminal 20 is fixed on the bottom wall 11. Of course, the straight terminal 20 may be directly installed on the bottom wall 11 without the fixing block 22.

The first grounding strip 31 and the second grounding strip 32 are made of sheet metal, a plurality of the first grounding strips 31 are parallel to each other, and a plurality of the second grounding strips 32 are parallel to each other. The plurality of first grounding sheets 31 are integrally formed with the insulating housing 10, and the plurality of second grounding sheets 32 are assembled in the insulating housing 10. Preferably, in this embodiment, the plurality of first grounding strips 31 and the plurality of second grounding strips 32 are arranged to cross each other perpendicularly. Each of the first ground plates 31 includes a first holding portion 310 integrally formed with the bottom wall 11, and a first mounting portion 311 extending downward from the first holding portion 310 for electrical connection with the first circuit board 3, and The first docking portion 313 extends upward from the first holding portion 310 into the receiving space 13. The first mating portion 313 includes a flat portion 315 and a plurality of contact elastic pieces 319 extending from the flat portion 315. The contact elastic piece 319 is integrally formed by stamping from the flat part 315 and is bent out of the plane where the flat part 315 is located. The second ground plate 32 includes a second holding portion 320 mounted on the bottom wall 11, extending downward from the second holding portion 320 for mounting on the first circuit board 3, and a second mounting portion 321 mounted on the first circuit board 3. The holding portion 320 extends upward into the second docking portion 323 of the receiving space 13. The size of the first mating portion 313 extending into the accommodating space 13 is greater than the size of the mating portion 213 of the straight terminal 20 extending into the accommodating space 13, and the size of the second mating portion 323 extending into the accommodating space 13 is smaller than that of the straight terminal 20 The mating portion 213 of the terminal 20 extends into the size of the receiving space 13. The first mounting portion 311 includes a plurality of first ground pins 317, the second mounting portion 321 includes a plurality of second ground pins 327, and the number of the second ground pins 327 is at least the number of the first ground pins 317. three times. After the first electrical connector 1 is assembled, each pair of the straight terminal 20 is provided with a first ground pin 317 on both sides of the mounting portion 211 in the transverse direction, and a plurality of second ground pins 317 are provided on both sides of the longitudinal direction. GND 327. The first holding portion 310 is provided with a plurality of first grooves 318 opening downwards, and the second mating portion 323 is provided with a plurality of second grooves 328 opening upwards. The first ground plate 31 and the first The two ground plates 32 are locked with each other through the first slot 318 and the second slot 328. The two sides of the second holding portion 320 of the second grounding sheet 32 are respectively provided with resisting portions 329, and the resisting portions 329 are used to limit the position of the second grounding sheet 32 with the insulating housing 10 when the second grounding sheet 32 is installed from the bottom up. , So as to ensure that the second grounding strips 32 inserted into the bottom wall 11 are installed at a predetermined position.

The signal transmission straight terminal 20 of the first electrical connector 1 of the present invention is shielded in the circumferential direction by the first ground plate 31 and the second ground plate 32, which improves the shielding effect of the first electrical connector 1. In addition, the first ground plate 31 and the insulating housing 10 are integrally formed, and the second ground plate 32 is assembled to the insulating housing 10 so that the structure of the insulating housing 10 is simple and reliable, and provides better conditions for stable transmission of high-frequency signals.

The second electrical connector 2 includes a plurality of terminal modules 40 stacked laterally and a holder 60 that fixes the plurality of terminal modules 40 as a whole. Each of the terminal modules 40 includes an insulating body and is held in the insulating A plurality of signal terminals 71 in the body, a plurality of ground terminals 81 held in the insulating body, and a first ground plate 91 and a second ground plate 92 located on opposite sides of the terminal module 40.

The insulating body includes a plurality of first insulating bodies 72 for holding signal terminals 71 and a second insulating body 50 for holding ground terminals 81. Both the signal terminals 71 and the ground terminals 81 are conductive terminals. The first insulating body 72 holds a pair of signal terminals 71 to form a signal terminal assembly 70, and each second insulating body 50 holds a plurality of ground terminals 81 to form a ground terminal assembly 80. The pair of signal terminals 71 and the first insulating body 72 are integrally formed. The multiple ground terminals 81 are integrally formed with the second insulating body 50.

The signal terminals 71 are arranged in the form of a signal terminal pair 710. Each pair of the signal terminals 71 is used to transmit a pair of differential signals. In the same terminal module 40, the differential signal terminal pair 710 and the ground terminal 81 are arranged vertically. They are arranged at intervals in the straight direction, each of the signal terminals 71 includes a wide side and a narrow side, and each of the ground terminals 81 includes a wide side and a narrow side. The size of the wide side of the ground terminal 81 is larger than the size of the wide side of the signal terminal 71. The broad sides of the signal terminal pairs 710 are arranged on the same plane, and the broad sides of each ground terminal 81 are arranged in a plane that intersects the plane where the differential signal terminal pair 710 is located. The ground terminal 81 is arranged in a plane perpendicular to the plane where the differential signal terminal pair 710 is located.

Each of the signal terminals 71 includes a mating end 73 extending from the first insulating body 72 along the mating direction, a mounting end 74 extending from the first insulating body 72 along the mounting direction, and an intermediate portion between the mounting end 74 and the mating end 73部75. The mating end 73 is perpendicular to the mounting end 74. The plurality of signal terminals 71 are all narrow-side coupled from the mounting end 74 to the mating end 73. The docking end 73 includes a main body 731 and a pair of beams extending from the main body 731 to the butting direction. The first beam 732 includes a first contact portion, the second beam 733 includes a second contact portion, and the body 731 includes The 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, and the second contact portion includes a third contact bump 703. A contact bump 701 and the second contact bump 702 are arranged in a first direction, that is, arranged in a row direction. The third contact bump 703 is opposite to the first contact bump 701 and the second contact bump. 702 is arranged in a direction perpendicular to the first direction and opposite to the mating direction, so 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 Relative to the third contact bump 703, the first electrical connector 1 is first mated. The area of the third contact bump 703 is greater than the sum of the areas of the first contact bump 701 and the second contact bump 702. The height of the protrusion of the first contact protrusion 701 and the protrusion of the second contact protrusion 702 are the same, and the protrusion height of the third contact protrusion 703 is smaller than the protrusion height of the first contact protrusion 701. The first contact bumps 701 and the second contact bumps 702 are formed by bending the first beam 732 and the second beam 733 along the third direction perpendicular to the first direction and perpendicular to the second direction. The third contact bump 703 is stamped from the main 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 party. The first contact bump 701 and the second contact bump 702 protrude along the entire first direction of the first beam 732 and the second beam 733, and the periphery of the third contact bump 703 is enclosed in the In the body 731. When the signal terminal 71 and the straight terminal 20 of the first electrical connector 1 are mated with each other, the three contact bumps are all in contact with the straight terminal 20, so that there are two contact points front and rear in the mating direction, that is, in the mating direction. The front contact is composed of the first contact bump 701 and the second contact bump 702 that are in relatively front direction, and the rear contact is composed of the third contact point 703 located relatively rearward. The two front and back contacts are opposite to A contact contact effectively solves the impact of the capacitive effect of a single-point contact on impedance matching during high-speed signal transmission, improves impedance matching after interconnection, and improves insertion loss.

The length of each pair 721 is greater than the length of the second signal terminal 712 exposed in 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 has 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, and the rear edge 54 is provided with a clamping rib 541 and a clamping rib 542. The retaining member 60 includes a rear edge 54 and an upper edge 54 along the second insulating body 50. The rim 52 extends to the rear wall 601 and the upper wall 602 which are matched with each other. The rear wall 601 is provided with a holding groove 610 for receiving the corresponding holding rib 541 and a holding groove 611 for receiving the corresponding holding rib 542. The clamping groove 611 may extend from the rear wall 601 to the upper wall 602 or may only be provided on the rear wall 601; the upper wall 602 is provided with a clamping groove 620 for receiving the clamping rib 521 corresponding to the upper edge 52 The clamping groove 620 opens forward and is arranged in a horizontal array on the holder 60 together with the other clamping grooves 610 and the clamping groove 611 to respectively hold the second insulating body. Therefore, each terminal module 40 can pass through the holder 60. , In order to achieve horizontal alignment and fixed as a whole. The second insulating body 50 is also provided with a card edge 512 and a card edge 522 on the lower edge 51 and the upper edge 52, respectively. The card edge 512 and the card edge 522 are used to guide the second electrical connector 2 to be electrically connected to the first electrical connector. The guide grooves 121 on the device 1 are aligned.

The second insulating body 50 has a first side 56 and a second side 57 opposed to each other in the thickness direction. 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 from the front edge 53 to the second insulating body 50 and is recessed from the first side surface 56 to the second insulating body 50. The groove 562 is recessed from the first side surface 56 to the second insulating body 50. It extends 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 of the grooves 562 is used to receive the first insulating body 72 holding a 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 protrusion 563. Therefore, ground terminals 81 are provided on both sides of each of the differential signal terminal pairs 710 in the vertical direction. The ground terminal 81 includes a ground mating end 83 that cooperates with the first electrical connector 1, a ground mounting end 84 mounted on the second circuit board, and an intermediate area 85 between the ground mounting end 84 and the ground mating end 83. The ground mounting end 84 extends beyond the signal terminal 71 mounting end 74, and the ground mating end 83 extends beyond the mating end 73 of the signal terminal 71 in the mating direction, so that the signal terminal 71 is covered on the entire transmission path. The width dimension of the grounding middle area 85 of the ground terminal 81 is larger than the thickness dimension of the second insulating body 50, so that the two sides of the width of the middle area 85 correspond to the second side 57 of the second insulating body 50 and the protrusion 563. The sides are exposed, and the middle area 85 includes contact pieces 851 that further extend to both sides. The mating end 73 of the signal terminal 71 and the grounding mating end 83 of the ground terminal are received in the mounting groove 560 in the form of a cantilever beam to be matched with the straight terminal 20 on the first electrical connector 1.

The first ground plate 91 is arranged on the first side 56 of the second insulating body 50, the second ground plate 92 is arranged on the second side 57 opposite to the first side 56, and the second insulating body 50 is arranged There are a first mounting frame 561 for installing the first grounding plate 91 and a second mounting frame 571 for installing the second grounding plate 92. The first mounting frame 561 has the same outline as the first grounding plate 91, so The second mounting frame 571 has the same outline as the second ground 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, and the second mounting frame 571 is recessed from the first side 56 of the second insulating body 50 The second side 57 of the second insulating body 50 is recessed toward the second insulating body 50, the thickness of the first ground plate 91 is not greater than the depth of the first mounting frame 561, and the thickness of the second ground 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 ground plate 91, and the depth of the second mounting frame 571 is the same as the thickness of the second ground plate 92, therefore, this embodiment After the first grounding plate 91 and the second grounding plate 92 are installed on the second insulating body 50, the thickness of each terminal module 40 is the same as the thickness of the second insulating body 50. A hole 565 is also provided in the first mounting frame 561, 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 gap 902, and the first ground plate 91 includes a contact insert 901 that extends through the hole 565 and is matched with the gap 902 to connect the first ground plate 91 and the second ground plate 92 are mechanically and electrically connected.

The first ground plate 91 includes a first flat portion 910, a first contact portion 911 extending from the first flat portion 910 in the mating direction, and a first mounting foot 913 extending from the first flat portion 910 in the direction of the circuit board, The second ground plate 92 includes a second flat portion 920, a second contact portion 921 extending from the second flat portion 920 in the mating direction, and a second mounting foot 923 extending from the second flat portion 920 in the direction of the circuit board 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 portion 910, and the second contact portion 921 and the second flat portion 920 are in the same plane, so that the first contact portion 911 is also closer. Close to the second contact part 921. When the terminal modules 40 are assembled together, the distance between the first contact portion 911 and the second contact portion 921 of the first ground plate 91 and the second ground plate 92 on the adjacent sides of the two adjacent terminal modules 40 Greater than the distance between the first flat portion 910 and the second flat portion 920, so that the first mating portion 313 of the first ground plate 31 of the first electrical connector 1 can extend into the first contact portion 911 and the second contact portion 921 The first contact portion 911 and the second contact portion 921 are both mechanically and electrically connected. The flat portion 315 of the first mating portion 313 is in contact with the second contact portion 921, and the contact elastic piece 319 is in contact with the first contact portion 921. The parts 911 contact and cooperate with each other. The first flat portion 910 includes a first aperture 917 that can be matched with the contact piece 851 of the ground terminal 81, and the second flat portion 920 includes a plurality of first apertures 917 that can be matched with the contact piece 851 of the second side of the ground terminal 81. Two pores 927. Of course, one of the first ground plate 91 or the second ground plate 92 may be in contact with the ground terminal. The grounding terminal 81 cooperates with the first grounding plate 91 and the second grounding plate 92 to form a shielded channel with a closed periphery, and a pair of signal terminals 71 located in the channel are completely grounded in the circumferential direction of the entire transmission path. The mask makes the crosstalk effect between a pair of signal terminals 71 be reduced to the most ideal state, so as to achieve the purpose of reducing signal crosstalk between the pairs of signal terminals and achieve a higher rate of signal transmission.

After the first electrical connector 1 and the second electrical connector 2 are mated, each pair of straight terminals 20 and the corresponding signal terminal 71 are matched with each other to form a pair of signal paths, and the first ground plate 31 is connected to the adjacent two terminal modules. The adjacent first grounding plate 91 and the second grounding plate 92 of the group are mechanically connected together. The second grounding plate 32 and the grounding terminal 81 cooperate with each other to form a pair of signal paths of the straight terminal 20 and the signal terminal 71 The entire transmission path is completely shielded in the circumferential direction, which has a better effect of shielding electromagnetic crosstalk. And the structure is simple and reliable, which provides better conditions for the stable transmission of high-frequency signals.

The above descriptions are only the best embodiments of the present invention, not all or the only embodiments. Any equivalent changes made to the technical solutions of the present invention by those of ordinary skill in the art by reading the description of the present invention are all of the present invention. Covered by claims.

1 first electrical connector 2: The second electrical connector 3: The first circuit board 4: The second circuit board 10: Insulating shell 20: Straight terminal 33: Mask cavity 31: The first ground plate 32: The second ground plate 11: bottom wall 12: side wall 13: Containment space 100: connector assembly 111: mounting hole 112: Installation seam 121: Guiding Groove 210: Holding part 211: Installation Department 213: Docking Department 22: fixed block 310: The first holding part 311: The first installation part 313: The first docking part 315: Flat part 319: contact shrapnel 320: second holding part 321: The second installation part 323: The second docking part 317: first ground pin 327: second ground pin 318: first card slot 328: second card slot 329: Resist Department 40: terminal module 60: Holder 71: signal terminal 81: Ground terminal 91: The first ground plate 92: second ground plate 710: Signal terminal pair 72: The first insulating body 50: The second insulating body 70: Signal terminal assembly 80: Ground terminal assembly 73: Butt end 74: Mounting side 75: middle part 732: The First Beam 733: second beam 731: body 701: first contact bump 702: second contact bump 703: third contact bump 711: The first signal terminal 712: second signal terminal 721: air gap 51: bottom edge 52: upper edge 53: Leading Edge 54: trailing edge 521, 541, 542: clamping rib 601: Back Wall 602: upper wall 610, 611, 620: card slot 512, 522: Card Edge 56: First side 57: second side 560: installation slot 562: groove 563: bulge 83: Grounding mating terminal 84: Grounding installation end 85: middle area 561: first installation frame 571: second mounting frame 565: hole 902: gap 901: Contact Insert 910: The first flat part 911: The first contact 913: first mounting foot 920: The second flat part 921: Second Contact 923: second mounting foot 851: contact piece 917: first pore 927: second pore

The first figure is a perspective view of the connector assembly composed of the first electrical connector of the present invention and the second electrical connector mated with it. The second figure is a perspective view of the first electrical connector and the second electrical connector shown in the first figure before mating. The third figure is a perspective view from another perspective before the first electrical connector and the second electrical connector shown in the second figure are mated. The fourth figure is a partial exploded view of the first electrical connector shown in the first figure. The fifth figure is a combined diagram of the first ground plate and the second ground plate of the first electrical connector shown in the fourth figure. The sixth figure is a partial exploded view of the first electrical connector terminal assembly shown in the fourth figure. The seventh figure is the top view of the first electrical connector shown in the first figure. The eighth figure is a partial exploded view of the second electrical connector shown in the first figure. The ninth figure is a partial exploded view of the terminal module of the second electrical connector shown in the eighth figure. The tenth figure is a view from another direction of the terminal module shown in the ninth figure. The eleventh figure is a further exploded view of the terminal module shown in the ninth figure. The twelfth figure is a view from another direction of the terminal module shown in the eleventh figure. Figure 13 is a perspective view of the signal terminals of the terminal module shown in Figure 11. Figure 14 is a perspective view of the mutual cooperation between part of the signal terminals and part of the ground shield of the connector assembly shown in Figure 1. The fifteenth figure is a cross-sectional view along the XV-XV direction when the connector assembly shown in the first figure is in a mated state. The sixteenth figure is a cross-sectional view along the XVI-XVI direction when the connector assembly shown in the first figure is in a mated state. Fig. 17 is a partial enlarged view of the connector assembly shown in Fig. 14 in the mating state. Figure 18 is a partial enlarged view of the connector assembly shown in Figure 15 in a mated state.

without

92: second ground plate

50: The second insulating body

57: second side

71: signal terminal

72: The first insulating body

81: Ground terminal

91: The first ground plate

Claims (10)

An electrical connector assembly, which includes: An electrical connector, the electrical connector comprising a plurality of first grounding strips arranged laterally; and A docking connector, the docking connector and the electrical connector are matched with each other, the docking connector includes a plurality of laterally arranged terminal modules, and each of the terminal modules includes: A first ground plate, the first ground plate is located on the first side of the terminal module; and A second ground plate, the second ground plate is located on a second side of the terminal module opposite to the first side; Wherein, the first ground sheet is mechanically and electrically connected to the ground plates on the adjacent sides of two adjacent terminal assemblies. The electrical connector assembly according to claim 1, wherein after the electrical connector and the mating connector are mated with each other, the first ground plate is located on the first ground plate and the first ground plate on the adjacent sides of two adjacent terminal assemblies Between two ground plates. The electrical connector assembly according to claim 2, wherein the first ground plate of each of the terminal modules includes a first flat part and a first contact part extending from the first flat part, and the second The ground plate includes a second flat plate portion and a second contact portion extending from the second flat plate portion, wherein the first contact portion is closer to the second ground plate than the second contact portion. The electrical connector assembly according to claim 3, wherein the length of the first contact part extending in the mating direction is greater than the length of the second contact part extending in the mating direction. The electrical connector assembly according to claim 4, wherein the first ground plate includes a first mating portion, the first mating portion includes a flat plate portion and a plurality of contact elastic pieces protruding from the flat plate portion, the flat plate portion and The second contact portions on the adjacent sides of two adjacent terminal assemblies are in contact and fit, and the contact elastic pieces are in contact and fit with the first contact portions on the adjacent sides of the two adjacent terminal assemblies. The electrical connector assembly according to claim 2, wherein the electrical connector further includes an insulating body, a plurality of signal terminals held in the insulating body, and a plurality of second grounding plates held in the insulating body, the first A ground sheet and the second ground sheet are perpendicular to each other, the first ground sheet and the second ground sheet cover each of the signal terminals from the circumferential direction, and the second ground sheet is connected to all terminal modules. The ground terminal is mechanically and electrically connected. The electrical connector assembly according to claim 6, wherein the terminal module includes an insulating housing, signal terminals and ground terminals fixed in the insulating housing and arranged at intervals in the vertical direction, and the signal terminals are arranged at In the same plane, each of the ground terminals is located in a plane perpendicular to the same plane. The electrical connector assembly according to claim 7, wherein the second ground plate is mechanically and electrically connected to the ground terminal. The electrical connector assembly according to claim 8, wherein the first ground plate and the second ground plate of the same terminal module are combined with the ground terminal to shield a pair of signal terminals from a circumferential direction. The electrical connector assembly according to claim 9, wherein the first ground plate and the second ground plate of the same terminal module are mechanically and electrically connected, and the first ground plate and the second ground plate are connected mechanically and electrically. At least one of the ground plates is mechanically and electrically connected to the ground terminal.

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