CN111370943A

CN111370943A - Electrical connector

Info

Publication number: CN111370943A
Application number: CN202010155226.4A
Authority: CN
Inventors: 宋涛; 刘琨
Original assignee: Dongguan Luxshare Technology Co Ltd
Current assignee: Dongguan Luxshare Technology Co Ltd
Priority date: 2020-03-06
Filing date: 2020-03-06
Publication date: 2020-07-03

Abstract

An electric connector comprises a plurality of terminal modules which are stacked together, wherein each terminal module comprises a signal terminal module and a grounding piece which is matched with the signal terminal module, each signal terminal module comprises an insulating body and a signal terminal which is installed on the insulating body, each signal terminal comprises a contact part, a tail part and a connecting part which is connected with the contact part and the tail part, the insulating body is provided with a groove which is used for accommodating the connecting part and a metal layer which is positioned in the groove, the grounding piece covers the side face, provided with the groove, of the insulating body, and the metal layer and the grounding piece jointly encircle the connecting part. According to the invention, the metal layer positioned in the groove is arranged on the insulating body, and the metal layer and the grounding piece together form the external shielding layer for shielding the signal terminal, so that the signal transmission quality is improved.

Description

Electrical connector

Technical Field

The invention relates to an electric connector, and belongs to the technical field of high-speed connectors.

Background

Existing high-speed connectors can be applied, for example, in switches to achieve high-speed transmission of data. To improve the quality of data transmission, existing high-speed connectors typically require a shield that at least partially surrounds the differential signal terminals. The coupling of the differential signal terminals generally includes both broadside coupling and narrow-side coupling. However, how to improve the shielding effect is still a technical problem for those skilled in the art.

Disclosure of Invention

The invention aims to provide an electric connector with a better shielding effect.

In order to achieve the purpose, the invention adopts the following technical scheme: an electric connector comprises a plurality of terminal modules which are stacked together, wherein each terminal module comprises a signal terminal module and a grounding piece which is matched with the signal terminal module, each signal terminal module comprises an insulating body and at least one pair of differential signal terminals which are installed on the insulating body, each differential signal terminal comprises a contact part, a tail part and a connecting part which is used for connecting the contact part with the tail part, the insulating body is provided with a side surface, a groove which penetrates through the side surface and is used for accommodating the connecting part and a metal layer which is located in the groove, the grounding piece covers the side surface, and the metal layer and the grounding piece jointly encircle the connecting part.

As a further improved technical scheme of the invention, the grounding piece is a grounding sheet processed and molded by a metal material.

As a further improved technical solution of the present invention, the grounding plate is provided with a shielding part at least partially surrounding the periphery of the contact part and a main body part connected with the shielding part, and the main body part covers the side surface.

As a further improved technical solution of the present invention, the electrical connector further includes a plurality of plastic parts, the plastic parts cover the corresponding side surfaces, the grounding part is a shielding layer coated on the plastic parts, and the shielding layer is located on one side of the plastic parts close to the groove.

As a further improved technical scheme of the invention, the metal layer is coated in the groove.

As a further improved technical scheme of the invention, the metal layer is in contact with the grounding piece.

As a further improved technical solution of the present invention, the insulation body is provided with a first end surface and a second end surface, the groove is formed between the first end surface and the second end surface, the groove is provided with a first mounting groove close to the first end surface and a second mounting groove close to the second end surface, the signal terminal module comprises a first positioning block and a second positioning block fixed on the signal terminal, the first positioning block is mounted in the first mounting groove, the second positioning block is mounted in the second mounting groove, and the connecting portion connects the contact portion through the first mounting groove and connects the tail portion through the second mounting groove.

As a further improved technical solution of the present invention, the signal terminals are a pair of differential signal terminals, the pair of differential signal terminals includes a first signal terminal and a second signal terminal, the contact portion includes a first contact portion disposed on the first signal terminal and a second contact portion disposed on the second signal terminal, the tail portion includes a first tail portion disposed on the first signal terminal and a second tail portion disposed on the second signal terminal, and the connection portion includes a first connection portion disposed on the first signal terminal and a second connection portion disposed on the second signal terminal.

As a further improved technical solution of the present invention, the plurality of terminal modules are stacked in a thickness direction, the first end face of the insulating body faces an electrical connector mating direction, the second end face faces a fixing direction, the electrical connector mating direction, the fixing direction and the thickness direction are perpendicular to each other, and the first mounting grooves of the plurality of adjacent terminal modules are arranged in a staggered manner in the thickness direction.

As a further improved technical solution of the present invention, the contact portion is provided with an arc-shaped contact wall extending along the mating direction of the electrical connector, and the arc-shaped contact wall is provided with a terminal receiving cavity and an arc-shaped inner surface surrounding the terminal receiving cavity, wherein the terminal receiving cavity is used for inserting a mating terminal, and the arc-shaped inner surface is used for contacting with the outer surface of the mating terminal.

Compared with the prior art, the metal layer positioned in the groove is arranged on the insulating body, and the metal layer and the grounding piece jointly surround the connecting part to form the external shielding layer for shielding the signal terminal, so that the quality of signal transmission is improved.

Drawings

Fig. 1 is a perspective view of an electrical connector assembly of the present invention.

Fig. 2 is a perspective view of fig. 1 from another angle.

Fig. 3 is an exploded perspective view of fig. 1.

Fig. 4 is a partially exploded perspective view of the first female electrical connector and the first circuit board of fig. 3.

Fig. 5 is a left side view of the first female end housing of fig. 4.

Fig. 6 is a right side view of the first female end housing of fig. 4.

Fig. 7 is a right side view of the first female terminal module of fig. 4 with the first female housing removed.

Fig. 8 is a perspective view of a first female terminal module of fig. 7.

Fig. 9 is an exploded perspective view of fig. 8.

Fig. 10 is a partially exploded perspective view of the first female terminal module of fig. 4 with the first female housing removed.

Fig. 11 is an exploded perspective view of fig. 10 from another angle.

Fig. 12 is a perspective view of the first female differential signal terminal of fig. 11.

Fig. 13 is a front view of fig. 12.

Fig. 14 is a left side view of fig. 12.

Fig. 15 is a perspective view of the second female electrical connector with the second female housing of fig. 3 removed.

Fig. 16 is a left side view of fig. 15.

Fig. 17 is a partially exploded perspective view of fig. 15.

Fig. 18 is a perspective view of the adaptor of fig. 3.

Fig. 19 is a perspective view of fig. 18 from another angle.

Fig. 20 is a left side view of fig. 18.

Fig. 21 is a partially exploded perspective view of fig. 18.

Fig. 22 is another angled and further exploded perspective view of fig. 21.

Detailed Description

Referring to fig. 1 to 22, an electrical connector assembly 400 of the present invention includes a first female electrical connector 100, a second female electrical connector 200, and an adapter 300 for connecting the first female electrical connector 100 and the second female electrical connector 200. Referring to fig. 1, in the illustrated embodiment of the present invention, the first female electrical connector 100 has a first mounting surface 18 for mounting on a first circuit board 101, the second female electrical connector 200 has a second mounting surface 19 for mounting on a second circuit board 201, the first mounting surface 18 is perpendicular to the second mounting surface 19, and the first circuit board 101 is perpendicular to the second circuit board 201. In addition, according to the difference of the terminal arrangement, the first female electrical connector 100 and the second female electrical connector 200 can also be a first male electrical connector and a second male electrical connector, respectively. The first female electrical connector 100, the second female electrical connector 200, the first male electrical connector and the second male electrical connector in the present embodiment are all called electrical connectors.

Referring to fig. 4 to 14, the first female electrical connector 100 includes a female housing 10 and a plurality of female terminal modules 20 mounted on the female housing 10, wherein the female terminal modules 20 are stacked together.

The female terminal housing 10 is provided with a guide groove 102 for guiding and positioning the plurality of female terminal modules 20, a plurality of circular through holes 103, and a plurality of C-shaped through grooves 104, wherein the through holes 103 form a group in pairs, and the corresponding through grooves 104 at least partially surround the periphery of each group of through holes 103.

The plurality of female terminal modules 20 are similar in structure, and only one of them will be described in detail below.

Referring to fig. 9, the female terminal module 20 includes a female signal terminal module 2 and a grounding member engaged with the female signal terminal module 2. In one embodiment of the invention, the grounding member is a female end grounding plate 3 which is formed from a metal material, such as stamped from a sheet of metal. The female terminal signal terminal module 2 comprises a female terminal insulating body 21 and a signal terminal installed on the female terminal insulating body 21. In one embodiment of the present invention, the signal terminals are a pair of female differential signal terminals 22. Referring to fig. 7 and 12, the female differential signal terminal 22 includes a female contact 221, and the female ground plate 3 has a female shielding portion 31 at least partially surrounding the female contact 221. The female contact portion 221 is provided with an arcuate contact wall 222 extending along the mating direction a-a of the electrical connector, the arcuate contact wall 222 configured to contact a mating terminal, which may be a terminal of a mating connector (e.g., the adapter 300). The arc-shaped contact wall 222 is provided with an arc-shaped inner surface 223, and the arc-shaped inner surface 223 is configured to contact with an outer surface of the counterpart terminal. The curved contact wall 222 defines a terminal receiving cavity 220 for receiving the mating terminal, and the curved inner surface 223 surrounds the terminal receiving cavity 220.

It will be appreciated that in other embodiments, the arcuate contact wall 222 may be provided with an arcuate outer surface for insertion into a mating terminal for contact with an inner surface of the mating terminal, as well as for terminal contact purposes.

Specifically, referring to fig. 7 and 12, the female differential signal terminal 22 includes a first signal terminal 4 and a second signal terminal 5, the first signal terminal 4 includes a first contact portion 41, a first tail portion 42 and a first connection portion 43 connecting the first contact portion 41 and the first tail portion 42, and the second signal terminal 5 includes a second contact portion 51, a second tail portion 52 and a second connection portion 53 connecting the second contact portion 51 and the second tail portion 52. Female end contact portion 221 includes first contact portion 41 and second contact portion 51, arc contact wall 222 is including being located first arc contact wall 411 on first contact portion 41 and being located second arc contact wall 511 on second contact portion 51, first arc contact wall 411 is two at least and relative setting, second arc contact wall 511 is two at least and relative setting. The terminal receiving cavities 220 include first terminal receiving cavities 2201 formed by the two first arc-shaped contact walls 411 and second terminal receiving cavities 2202 formed by the two second arc-shaped contact walls 511.

The first contact portion 41 is provided with two first slots 412 located between the two first arc-shaped contact walls 411, and the two first slots 412 are communicated with the first terminal accommodating cavity 2201, so that the first contact portion 41 has certain elastic deformation capability, and is convenient for clamping the butt-joint terminal, thereby improving the contact reliability of the butt-joint terminal and the butt-joint terminal. Similarly, the second contact portion 51 is provided with two second slots 512 located between the two second arc-shaped contact walls 511, and the two second slots 512 are communicated with the second terminal receiving cavity 2202, so that the second contact portion 51 has a certain elastic deformation capability, which facilitates clamping of the butt terminal and improves the contact reliability of the two.

Of course, in other embodiments, there may be one first arc-shaped contact wall 411 and one second arc-shaped contact wall 511, and in this case, the cross sections of the first contact portion 41 and the second contact portion 51 may be substantially C-shaped, circular, elliptical, and the like.

A first intersection part 44 is arranged between the first connecting part 43 and the first contact part 41 and between the second connecting part 53 and the second contact part 51, and a second intersection part 45 is arranged between the first connecting part 43 and the first tail part 42 and between the second connecting part 53 and the second tail part 52; wherein:

the first contact portion 41 and the second contact portion 51 are aligned along a fixing direction B-B, the first connection portion 43 and the second connection portion 53 are aligned along a thickness direction C-C of the female-end signal terminal module 2, and the first tail portion 42 and the second tail portion 52 are aligned along an electrical connector mating direction a-a. In the illustrated embodiment of the present invention, the fixing direction B-B is a direction in which the first tail portion 42 and the second tail portion 52 are inserted into a circuit board (e.g., the first circuit board 101). After the first tail portion 42 and the second tail portion 52 are inserted into the mounting holes of the circuit board, they can be fixed and electrically connected to the circuit board by soldering. The fixing direction B-B, the thickness direction C-C and the butt joint direction A-A of the electric connector are mutually vertical.

Referring to fig. 7, in the illustrated embodiment of the present invention, a plurality of female differential signal terminals 22 of each female terminal module 20 are arranged in a row along the fixing direction B-B, and the first contact portions 41 and the second contact portions 51 of each female differential signal terminal 22 are arranged in a row along the fixing direction B-B; however, the first contact portions 41 and the second contact portions 51 of the female differential signal terminals 22 of the adjacent ones of the several female terminal modules 20 are arranged offset from each other. As shown in fig. 7, the first row of female differential signal terminals 22 of the leftmost first straight row of female terminal module 20 and the second row of female differential signal terminals 22 of the leftmost second straight row of female terminal module are not aligned with each other in the thickness direction C-C to form a staggered arrangement, and the first row of female differential signal terminals 22 of the non-adjacent leftmost first straight row of female terminal module 20 and the third row of female differential signal terminals 22 of the leftmost third straight row of female terminal module can be aligned with each other in the thickness direction C-C. By arranging the female differential signal terminals 22 of two adjacent female terminal modules 20 in a staggered manner, a 90-degree conversion structure of the female differential signal terminals 22 in the female terminal modules 20 of the first female electrical connector 100 and the second female electrical connector 200 can be realized by matching with a twisted structure (detailed later) of the mating terminal in the adaptor 300. Also, crosstalk between adjacent female differential signal terminals 22 can be reduced.

As shown in fig. 11, the female terminal signal terminal module 2 further includes a first positioning block 61 fixed on the first cross portion 44 and a second positioning block 62 fixed on the second cross portion 45, so as to form the female terminal differential signal terminal 22 as a whole.

Referring to fig. 9 and 11, the female terminal insulator 21 has a first end surface 211, a second end surface 212, and a plurality of grooves 213 formed between the first end surface 211 and the second end surface 212. The groove 213 includes a first linear portion 2131, a second linear portion 2132, and an inclined portion 2133 that communicates the first linear portion 2131 with the second linear portion 2132. In the illustrated embodiment of the present invention, the first linear portion 2131 extends in the mating direction a-a (e.g., the horizontal direction), and the second linear portion 2132 extends in the fastening direction B-B (e.g., the vertical direction). A metal layer 2130 is disposed in the trench 213, and each pair of female differential signal terminals 22 is located in the corresponding trench 213. The groove 213 is provided with a first mounting groove 2134 adjacent to the first end surface 211 and a second mounting groove 2135 adjacent to the second end surface 212. From another perspective, referring to fig. 11, the female terminal insulator 21 has a side surface 210, the groove 213 penetrates the side surface 210 along the thickness direction C-C, and the groove 213 is used for receiving the first connecting portion 43 and the second connecting portion 53. The female end grounding strip 3 covers the side surface 210, and the metal layer 2130 and the female end grounding strip 3 surround the first connecting portion 43 and the second connecting portion 53 together, so as to enhance the shielding effect and improve the quality of signal transmission. The plurality of female terminal modules 20 are stacked along the thickness direction C-C, the first end surface 211 of the female insulating body 21 faces the mating direction a-a of the electrical connector, and the second end surface 212 faces the fixing direction B-B. Referring to fig. 16, the first mounting grooves 2134 of the adjacent female terminal modules 20 are disposed in a staggered manner in the thickness direction C-C. The first contact portions 41 and the second contact portions 51 of the female differential signal terminals 22 are exposed from the corresponding first mounting grooves 2134, and accordingly, the first contact portions 41 and the second contact portions 51 of the female differential signal terminals 22 of the several female terminal modules 20 adjacent to each other are arranged in a staggered manner in the thickness direction C-C.

Referring to fig. 9 to 11, the female-end grounding plate 3 further includes a main body portion 32 connected to the female-end shielding portion 31 and a plurality of mounting legs 33 extending downward (parallel to the fastening direction B-B) from the main body portion 32. The female shielding portion 31 extends from the main body portion 32 along the mating direction a-a of the electrical connector and partially surrounds the periphery of the female contact portion 221, and the female shielding portion 31 has a first elastic piece 311 located above the first contact portion 41 and a second elastic piece 312 located below the second contact portion 51, so as to improve the reliability when mating with the mating connector.

When the positioning device is mounted, the first positioning block 61 is mounted in the first mounting groove 2134, and the second positioning block 62 is mounted in the second mounting groove 2135. With this arrangement, the first signal terminal 4 and the second signal terminal 5 can be mounted on the female terminal insulator 21; on the other hand, the first positioning block 61 and the second positioning block 62 can effectively prevent the first signal terminal 4 and the second signal terminal 5 from contacting the metal layer 2130. The first connecting portion 43 is connected to the first contact portion 41 through the first mounting groove 2134, and is connected to the first tail portion 42 through the second mounting groove 2135. The second connecting portion 53 is connected to the second contact portion 51 through the first mounting groove 2134, and is connected to the second tail portion 52 through the second mounting groove 2135.

The main body portion 32 covers the outer side of the groove 213, and the metal layer 2130 and the main body portion 32 can provide better wrapping for the female differential signal terminal 22, so that a better shielding effect is achieved. Preferably, the metal layer 2130 is in contact with the female terminal grounding plate 3, so that the shielding area is increased, and the shielding effect is improved.

In one embodiment of the present invention, the female terminal insulator 21 is made of a plastic material, and the metal layer 2130 is coated in the groove 213. In some embodiments, the metal layer 2130 is electroplated within the trench 213. In other embodiments, the first female electrical connector 100 further includes a plurality of plastic members covering the side surfaces 210 of the corresponding female insulation bodies 21, the grounding member is a shielding layer coated on the plastic member, and the shielding layer is located on one side of the plastic member close to the groove 213. That is, the female-end grounding plate 3 may be replaced by a plastic member plated with a shielding layer.

In the illustrated embodiment of the present invention, the mounting legs 33 extend from the main body 32 to be bent away from the main body 32, i.e., the mounting legs 33 are not in the same plane as the main body 32. Referring to fig. 8, the mounting feet 33, the first tail portions 42 and the second tail portions 52 are all aligned (i.e., arranged in a row) along the mating direction a-a of the electrical connector, so that the mounting feet can be mounted on the first circuit board 101 and the shielding effect of the female ground strip 3 on the female differential signal terminals 22 can be improved.

Referring to fig. 15 to 17, the second female electrical connector 200 has the same or similar technical features as the first female electrical connector 100, and those skilled in the art can understand the second female electrical connector 200 with reference to the first female electrical connector 100. Preferably, the first female electrical connector 100 and the second female electrical connector 200 are the same electrical connector, but the installation angle is different. By the arrangement, the die opening quantity can be reduced, and the cost is reduced. For this reason, in the illustrated embodiment of the present invention, the same reference numerals are used for corresponding features in the first female electrical connector 100 and the second female electrical connector 200.

Referring to fig. 18 to 22, the adaptor 300 includes an adaptor insulating body 7, a plurality of adaptor conductive terminals 8 mounted on the adaptor insulating body 7, and a plurality of adaptor grounding strips 9 matching with the plurality of adaptor conductive terminals 8.

The adapter housing body 7 includes a first receiving cavity 71 for mating with the first female electrical connector 100 and a second receiving cavity 72 for mating with the second female electrical connector 200. The adapter conductive terminal 8 includes a first mating portion 81 extending into the first receiving cavity 71, a second mating portion 82 extending into the second receiving cavity 72, and a torsion portion 83 located between the first mating portion 81 and the second mating portion 82. The adaptor ground pad 9 includes a first shielding shell 91 at least partially surrounding the periphery of the first docking portion 81 and a second shielding shell 92 at least partially surrounding the periphery of the second docking portion 82. When the first female electrical connector 100 and the second female electrical connector 200 are connected to the adaptor 300, it can be understood that the first shielding shell 91 and the second shielding shell 92 are respectively in contact with the female grounding plate 3 of the first female electrical connector 100 and the female grounding plate 3 of the second female electrical connector 200, so as to increase the grounding area, thereby achieving a better shielding effect.

Specifically, referring to fig. 22, the adaptor conductive terminal 8 includes a plurality of adaptor differential signal terminals 80, each pair of the adaptor differential signal terminals 80 includes a first adaptor signal terminal 801 and a second adaptor signal terminal 802, wherein the first adaptor signal terminal 801 and the second adaptor signal terminal 802 include the first docking portion 81, the second docking portion 82 and the torsion portion 83, and wherein:

the first mating portion 81 of the first adaptor signal terminal 801 and the first mating portion 81 of the second adaptor signal terminal 802 are arranged in the left-right direction; the second mating portion 82 of the first adaptor signal terminal 801 and the second mating portion 82 of the second adaptor signal terminal 802 are arranged in the up-down direction.

The above embodiments are only used for illustrating the present invention and not for limiting the technical solutions described in the present invention, and the understanding of the present specification should be based on the technical personnel in the technical field, such as the directional descriptions of "front", "back", "left", "right", "upper", "lower", etc., although the present specification has described the present invention in detail with reference to the above embodiments, the ordinary skilled in the art should understand that the technical personnel in the technical field can still make modifications or equivalent substitutions on the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.

Claims

1. An electrical connector (100, 200) comprising a plurality of terminal modules (20) stacked together, characterized in that: the terminal module (20) comprises a signal terminal module (2) and a grounding piece matched with the signal terminal module (2), the signal terminal module (2) comprises an insulating body (21) and signal terminals installed on the insulating body (21), each signal terminal comprises a contact part (221), a tail part (42, 52) and a connecting part (43, 53) for connecting the contact part (221) and the tail part (42, 52), the insulating body (21) is provided with a side surface (210), a groove (213) penetrating through the side surface (210) and used for accommodating the connecting parts (43, 53) and a metal layer (2130) located in the groove (213), the grounding piece covers the side surface (210), and the metal layer (2130) and the grounding piece jointly encircle the connecting parts (43, 53).

2. The electrical connector (100, 200) of claim 1, wherein: the grounding piece is a grounding sheet (3) which is formed by processing metal materials.

3. The electrical connector (100, 200) of claim 2, wherein: the grounding sheet (3) is provided with a shielding part (31) at least partially surrounding the periphery of the contact part (221) and a main body part (32) connected with the shielding part (31), and the main body part (32) covers the side surface (210).

4. The electrical connector (100, 200) of claim 1, wherein: the electric connector (100, 200) further comprises a plurality of plastic parts, the plastic parts cover the corresponding side surfaces (210), the grounding part is a shielding layer coated on the plastic parts, and the shielding layer is positioned on one side, close to the groove (213), of the plastic parts.

5. The electrical connector (100, 200) of claim 1, wherein: the metal layer (2130) is coated in the groove (213).

6. The electrical connector (100, 200) of claim 1, wherein: the metal layer (2130) is in contact with the ground.

7. The electrical connector (100, 200) of claim 1, wherein: the insulation body (21) is provided with a first end face (211) and a second end face (212), the groove (213) is formed between the first end face (211) and the second end face (212), the groove (213) is provided with a first mounting groove (2134) close to the first end face (211) and a second mounting groove (2135) close to the second end face (212), the signal terminal module (2) comprises a first positioning block (61) and a second positioning block (62) which are fixed on the signal terminal, the first positioning block (61) is mounted in the first mounting groove (2134), the second positioning block (62) is mounted in the second mounting groove (2135), and the connecting parts (43, 53) are connected with the contact part (221) through the first mounting groove (2134) and connected with the tail part (42, b) through the second mounting groove (2135), 52).

8. The electrical connector (100, 200) of claim 7, wherein said signal terminals are a pair of differential signal terminals (22), the pair of differential signal terminals (22) includes a first signal terminal (4) and a second signal terminal (5), the contact portion (221) includes a first contact portion (41) provided on the first signal terminal (4) and a second contact portion (51) provided on the second signal terminal (5), the tail portions (42, 52) including a first tail portion (42) provided on the first signal terminal (4) and a second tail portion (52) provided on the second signal terminal (5), the connecting portion (43, 53) includes a first connecting portion (43) provided on the first signal terminal (4) and a second connecting portion (53) provided on the second signal terminal (5).

9. The electrical connector (100, 200) of claim 7, wherein: the plurality of terminal modules (20) are stacked in a thickness direction (C-C), the first end face (211) of the insulating body (21) faces an electrical connector butting direction (A-A) and the second end face (212) faces a fixing direction (B-B), the electrical connector butting direction (A-A), the fixing direction (B-B) and the thickness direction (C-C) are perpendicular to each other, and the first mounting grooves (2134) of the plurality of adjacent terminal modules (20) are arranged in a staggered mode in the thickness direction (C-C).

10. The electrical connector (100, 200) of claim 9, wherein: the contact portion (221) is provided with an arc-shaped contact wall (222) extending along the mating direction (a-a) of the electrical connector, the arc-shaped contact wall (222) is provided with a terminal receiving cavity (220) and an arc-shaped inner surface (223) surrounding the terminal receiving cavity (220), wherein the terminal receiving cavity (220) is used for inserting a mating terminal, and the arc-shaped inner surface (223) is used for contacting with the outer surface of the mating terminal.