TWI790796B - Electrical connector - Google Patents

Abstract

The present invention relates to an electrical connector comprising an insulative housing and a plurality of power contacts, the insulative housing defines at least two mating spaces stacked along a height direction, the power contacts constitute a plurality of contact sets, each contact set comprising a first contact assembly and a second contact assembly. Each power contact comprises a retaining portion held in the insulative housing, a contacting portion and a soldering portion. The contacting portions of the first contact assembly and the second assembly in a same contact set are opposite to each other in a same mating space. The contacting portions extend in a same direction from front ends of the corresponding retaining portions, the soldering portions extend in another same direction from rear ends of the corresponding retaining portions, and the soldering portions extend in the opposite direction to the contacting portions.

Description

electrical connector

The invention relates to an electrical connector, in particular to an electrical connector capable of transmitting large current.

The power terminal of the traditional electrical connector is usually formed from the front end of the metal sheet into one or divided into multiple contact arms. With the increasing demand of consumers for the application of large current transmission of electrical connectors, conventional electrical connectors can no longer To meet the needs of large current transmission.

In view of this, it is indeed necessary to further improve the traditional electrical connector to solve the above problems.

The purpose of the present invention is to provide an electrical connector capable of transmitting large current.

To achieve the above object, the present invention provides an electrical connector, which includes an insulating body and a plurality of power terminals fixed on the insulating body, the aforementioned insulating body is formed with at least two docking spaces stacked along the height direction, and the plurality of power terminals A plurality of terminal groups are formed, each terminal group includes a first terminal combination and a second terminal combination, each power terminal includes a holding part fixed in the aforementioned insulating body, and a contact part protruding from one end of the holding part into the docking space And the welding part extending from the other end of the holding part. The contact parts of the first terminal combination and the second terminal combination in the same terminal group are relatively arranged in the same docking space, wherein the aforementioned contact parts are from the front end of the corresponding holding part. Extending in the same direction, the aforementioned welding portion is formed by extending in the same direction from the rear end of the corresponding holding portion, and the extending direction of the aforementioned welding portion is the same as that of the aforementioned contact portion The direction of extension is opposite.

As a further improvement of the present invention, the soldering parts of the terminal groups arranged adjacent to each other in the height direction are arranged oppositely and at intervals in the height direction, so as to form an insertion space for the circuit board to be inserted. .

As a further improvement of the present invention, the aforementioned welding portions are located between the top surface and the bottom surface of the aforementioned insulating body in the height direction.

As a further improvement of the present invention, wherein the welding portions of the power terminals in each of the aforementioned terminal groups are arranged in two rows in the front-rear direction, and the welding portions in each row are arranged side by side in the transverse direction.

As a further improvement of the present invention, in the front-rear direction, the welding portion of the first terminal assembly is located behind the welding portion of the second terminal assembly.

As a further improvement of the present invention, wherein the holding portions of the power terminals in each of the aforementioned terminal groups are arranged along the aforementioned height direction, and the holding portions of the aforementioned first terminal assembly are arranged along the height direction of the aforementioned insulating body, and the aforementioned second The holding parts of the terminal assembly are arranged along the height direction of the insulating body.

As a further improvement of the present invention, each of the aforementioned power terminals also has a connecting portion connecting its holding portion with its welding portion, and the aforementioned connecting portion has elasticity so that the aforementioned welding portion can be displaced in the height direction, so that The distance between the welding parts of the terminal groups in different docking spaces in the height direction is variable.

As a further improvement of the present invention, wherein the above-mentioned insulating body has a pair of slots arranged on both sides in the transverse direction, each of the aforementioned slots is recessed from the rear end of the aforementioned insulating body to allow the circuit board to be inserted from the rear to the front .

As a further improvement of the present invention, wherein each of the aforementioned slots is provided with a limit column And the limit card slot located on the outside of the aforementioned limit column, the aforementioned circuit board has a pair of protrusions protruding from its front side and a limit groove adjacent to the inner side of the corresponding protrusion, the aforementioned pair of protrusions are respectively forward Extend into the aforementioned limit card slot on the same side, and the aforementioned limit bar is inserted into the aforementioned limit slot backward.

As a further improvement of the present invention, wherein the rear surface of the limiting fence is located on the front side of the rear end of the insulating body, and the rear surface of the limiting fence is arc-shaped.

Compared with the conventional technology, the electrical connector of the present invention transmits large current through the design of the double-layer docking space to connect with the power supply unit, thereby greatly increasing the power of the product and supporting the continuous upgrade of the power supply unit; The contact part of the power terminal is arranged to extend in the same direction from the front end of the corresponding holding part, and the welding part is arranged to extend in the same direction from the rear end of the corresponding holding part, and the extending direction of the aforementioned welding part is opposite to the extending direction of the aforementioned contact part. While transmitting high current, the overall height of the electrical connector can be reduced, the space of the circuit board can be saved and the subsequent welding operation can be facilitated.

100: electrical connector

1: Insulation body

101: top wall

102: bottom wall

103: Intermediate wall

104: Transverse wall

11: Main body

110: docking space

112: terminal slot

113: Docking surface

12: Extension wall

120: Rear end face

121: slotting

123: Limit column

1231: rear surface

124: limit card slot

125: Guide surface

13: Partition wall

131: partition

2: Power terminal

2G: terminal group

2a: The first terminal combination

2b: Second terminal combination

21: Holding part

23: contact part

24: Welding part

25: Connecting part

26: Connection Department

3: Signal terminal

31: Signal holding part

32: Signal contact part

34: Signal welding part

4: Circuit board

41: protruding part

42: limit slot

The first figure is a three-dimensional assembly view of the electrical connector of the present invention.

The second figure is another perspective view of the electrical connector shown in the first figure.

The third figure is a partially exploded view of the electrical connector shown in the first figure.

The fourth figure to the fifth figure are cross-sectional views of the electrical connector shown in the first figure.

Figure 6 is a cross-sectional view of the electrical connector shown in Figure 1 with the circuit board removed.

The seventh figure is an exploded perspective view of the electrical connector shown in the first figure with the circuit board removed.

The eighth figure is a perspective view of the insulating body of the electrical connector shown in the first figure.

The ninth figure is a perspective view of two terminal groups in the electrical connector shown in the first figure.

Please refer to FIG. 1 to FIG. 9 which show a preferred embodiment of the electrical connector of the present invention. The electrical connector 100 includes an insulating body 1 and a plurality of power terminals 2 fixed on the insulating body 1 . For ease of description, the following description will take the butt end of the electrical connector 100 as the front end, and the other end opposite to the butt end as the rear end for description, that is, the front and rear directions are the distance between the electrical connector 100 and the mating component (not shown). The butt joint direction, at the same time, defines one direction perpendicular to the front-rear direction as the lateral direction, and the other direction perpendicular to the front-rear direction as the height direction. In this embodiment, the size of the insulating body 1 in the lateral direction is larger than its height direction and dimensions in the front-to-back direction.

The insulating body 1 has a main body 11 and a pair of extension walls 12 extending backward from the rear end of the main body 11 . The pair of extension walls 12 are oppositely disposed on both sides of the insulating body 1 in the transverse direction. In addition, the insulating body 11 also has at least two docking spaces 110 stacked in the height direction and a plurality of terminal grooves 112 connected to the aforementioned docking spaces 110. The arrangement of two or more docking spaces 110 can accommodate more power terminals. , so as to realize the transmission of larger current. The docking space 110 is opened forward and is formed at the front of the main body 11 , and the terminal groove 112 is formed at the rear of the main body 11 .

Specifically, the aforementioned insulative body 1 has a top wall 101 and a bottom wall 102 disposed opposite to both sides in the height direction thereof and an intermediate wall 103 between the aforementioned top wall 101 and the bottom wall 102 in the height direction. 101 and the middle wall 103 have two opposite wall surfaces defining the docking space 110 on the upper side, the aforementioned bottom wall 102 and the middle wall 103 have two opposite wall surfaces defining the docking space 110 on the lower side, and the aforementioned terminal slots 112 are formed on the upper side. Between two opposite wall surfaces of the aforementioned docking space 110 .

The aforementioned insulative body 1 also has at least two transverse walls 104 extending in the transverse direction, each of the aforementioned transverse walls 104 is arranged parallel to the aforementioned top wall 101 and the bottom wall 102, and each of the aforementioned docking spaces 110 is provided with a aforementioned transverse wall 104. wall 104 , and the transverse wall 104 is located in the middle of the docking space 110 in the height direction.

Also, in the present invention, the aforementioned insulator body 1 has four rows of terminal slots 112 arranged at intervals along the height direction, and the two rows of the aforementioned terminal slots 112 on the upper side communicate with the aforementioned docking space 110 on the upper side, and by The horizontal wall 104 between them separates it; the two rows of terminal grooves 112 located on the lower side communicate with the aforementioned docking space 110 located on the lower side, and are located between them in the height direction by another The transverse wall 104 separates them, that is, each aforementioned docking space 110 is correspondingly connected with two rows of the aforementioned terminal slots 112 .

Furthermore, the insulating body 1 further has a plurality of partition walls 13 arranged at intervals along the lateral direction, and one partition wall 13 is provided between every two adjacent terminal grooves 112 in the lateral direction. Each of the aforementioned partition walls 13 extends along the front-to-back direction, and its front end surface is coplanar with the abutting surface 113 of the aforementioned insulating housing 1 . Corresponding to each of the aforementioned docking spaces 110 , each of the aforementioned partition walls 13 is divided into a pair of barriers 131 opposite and spaced apart in the corresponding area of the aforementioned docking spaces 110 .

In addition, the aforementioned insulative housing 1 has a pair of slots 121 disposed on both sides in the transverse direction, each of the aforementioned slots 121 is formed by recessing forward from the rear end surface 120 of the aforementioned insulating housing 1 for insertion of the circuit board 4 from the rear to the front .

Specifically, in this embodiment, each of the aforementioned extension walls 12 is correspondingly provided with one of the aforementioned slots 121 , and the aforementioned slots 121 penetrate the aforementioned extension walls 12 along the transverse direction. Each of the aforementioned slots 121 is provided with a limiting column 123 and a limiting card slot 124 located outside the aforementioned limiting column 123, the rear surface 1231 of the aforementioned limiting column 123 is located on the front side of the rear end surface 120 of the aforementioned insulating body 1, and the aforementioned limiting The rear surface 1231 of the column 123 is curved. Each of the above-mentioned extension walls 12 also has a pair of guide surfaces 125 on the rear side thereof, and the above-mentioned pair of guide surfaces 125 are oppositely disposed on two sides of the corresponding slot 121 in the height direction.

Please refer to the first figure to the fourth figure, the sixth figure to the seventh figure and the ninth figure, the aforementioned complex power supply terminals 2 form a plurality of terminal groups 2G, and each terminal group 2G includes a first terminal group 2a and a second terminal group 2a. terminal group 2b, in this embodiment, the aforementioned first and second terminal combinations 2a and 2b both include two power terminals 2, and in other embodiments, the aforementioned first and second terminal combinations 2a and 2b can also include both Three or more power terminals 2 .

Each of the above-mentioned power terminals 2 is a single component made of a single metal sheet, and it includes a holding part 21 fixed in the above-mentioned insulating body 1, and a contact part protruding from one end of the holding part 21 into the docking space 110 23 and the welding portion 24 extending from the other end of the holding portion 21, the contact portion 23 of the first terminal assembly 2a and the second terminal assembly 2b in the same terminal group 2G are relatively arranged in the same docking space 110, the aforementioned contact portion 23 extends in the same direction from the front end of the corresponding holding portion 21, and the welding portion 24 extends in the same direction from the rear end of the corresponding holding portion 21, and the extending direction of the welding portion 24 is opposite to the extending direction of the contacting portion 23.

The contact portions 23 of the power terminals 2 in each of the aforementioned first terminal assemblies 2a are arranged along the lateral direction of the aforementioned insulating body 1, and the contact portions 23 of the power terminals 2 in each of the aforementioned second terminal assemblies 2b are arranged along the lateral direction of the aforementioned insulating body 1. Arrange settings in landscape orientation.

Further, the soldering portions 24 of the terminal groups 2G disposed in the two aforementioned docking spaces 110 adjacent to each other in the height direction are opposite and spaced apart in the height direction, so as to form an insertion space for the circuit board 4 to be inserted into.

Moreover, as shown in FIG. 6 , the welding portions 24 of the two terminal groups 2G are located between the top surface and the bottom surface of the insulating housing 1 in the height direction, so as to reduce the overall height of the electrical connector 100 .

The welding parts 24 of the power terminals 2 in each of the aforementioned terminal groups 2G are arranged in two rows in the front and rear direction, and the welding parts 24 in each row are arranged side by side along the transverse direction, and the welding parts of the power terminals 2 in each of the aforementioned terminal groups 2G are arranged in two rows. The bottom surface of 24 is substantially flush, so that it is positioned at the same level when it is in contact with the circuit board 4. On a plane, it not only reduces the space occupied by the circuit board 4 , but also facilitates the subsequent welding of the welding portions 24 of the multiple rows of power terminals 2 .

In the front-rear direction, the welding portion 24 of the first terminal assembly 2a is located behind the welding portion 24 of the second terminal assembly 2b. In addition, the welding portion 24 of the first terminal assembly 2a corresponding to the docking space 110 on the upper side and the welding portion 24 of the first terminal assembly 2a corresponding to the docking space 110 on the lower side are based on the horizontal central plane C of the electrical connector 100 -C' as the center is mirror-symmetrically arranged, and the contact portions 23 of the two aforementioned first terminal assemblies 2a are also mirror-symmetrically arranged centered on the horizontal central plane CC'.

In addition, the welding portions 24 of the two power terminals 2 in the first terminal assembly 2a are arranged alternately in the lateral direction, and the welding portions 24 of the two power terminals 2 in the second terminal assembly 2b are also arranged alternately in the lateral direction. In other words, among the two power terminals 2 of the first terminal assembly 2a, there is a gap between two adjacent contact portions 23 of one power terminal 2 , and at least part of the contact portion 23 of the other power terminal 2 can pass through. The aforementioned gap passes through one of the aforementioned power terminals 2 .

In this embodiment, the retaining portion 21 of each power terminal 2 is a sheet-like structure extending in the horizontal direction, and the retaining portion 21 is accommodated and positioned in the corresponding terminal groove 112 . Further, the holding portions 21 of the power terminals 2 in each of the aforementioned terminal groups 2G are arranged along the height direction, and the holding portions 21 of the first terminal assembly 2a are arranged along the height direction of the insulating body 1, and the aforementioned second The holding portions 21 of the two terminal assemblies 2 b are arranged along the height direction of the insulating housing 1 .

The number of rows of holding parts 21 in the height direction of each of the aforementioned terminal groups 2G is twice the number of rows of its contact parts 23 in the height direction, and twice the number of rows of its soldering parts 24 in the front-to-back direction .

In this embodiment, at least two pieces of power terminals 2 are accommodated in each terminal groove 112, and the contact portions 23 of the two pieces of power terminals 2 located in the same terminal groove 112 are arranged side by side in a row along the height direction; On the whole, the contact portions 23 of the power terminals 2 accommodated in the terminal slots 112 at the same center height are arranged in parallel in a row along the transverse direction.

Please refer to the third figure to the fourth figure, the sixth figure to the seventh figure and in conjunction with the ninth figure, each of the aforementioned power terminals 2 also has a connecting portion 25 connecting its holding portion 21 with its welding portion 24, the aforementioned connection The part 25 has elasticity so that the above-mentioned welding part 24 can be displaced in the height direction, so that the distance between the welding parts 24 of the terminal groups 2G in different docking spaces 110 can be changed in the height direction, so as to adapt to different thicknesses The circuit board 4.

Specifically, the connection portion 25 of the power terminal 2 in the aforementioned first terminal assembly 2a is formed obliquely extending from the holding portion 21 of the power terminal 2 towards the direction close to the horizontal central plane CC′ of the aforementioned electrical connector 100, and its The welding portion 24 is formed by bending from the rear end of the connecting portion 25 , further, the connecting portion 25 is straight and obliquely extended.

In each of the aforementioned second terminal combinations 2b, the holding portion 21 is closer to the horizontal central plane CC′ of the electrical connector 100. The connecting portion 25 of the power terminal 2 faces away from the level of the aforementioned electrical connector 100 from its holding portion 21. The direction of the central plane CC' is bent, and then it is formed to extend straight and obliquely towards the direction close to the horizontal central plane CC' of the electrical connector 100; the holding part 21 is far away from the horizontal central plane CC of the electrical connector 100 The connecting portion 25 of the power terminal 2 of ' extends obliquely from its holding portion 21 towards the direction close to the horizontal central plane CC' of the electrical connector 100, and is straight. The welding of the power terminal 2 in the second terminal combination 2b The portion 24 is formed by bending from the rear end of the corresponding connection portion 25, so that the bottom surface of the welding portion 24 of the power terminal 2 in the second terminal assembly 2b is substantially flush.

Each of the aforementioned power terminals 2 has an engaging portion 26 extending obliquely forward from the aforementioned holding portion 21. The aforementioned contact portion 23 is located on the front side of the aforementioned engaging portion 26 and is curved, and faces the horizontal center plane C1- of the corresponding docking space 110. C1', C2-C2' overhang formation.

In addition, as shown in the first figure to the third figure and the seventh figure, in the present invention, the aforementioned electrical connector 100 also has a plurality of signal terminals 3 located on one side of the aforementioned power terminal 2 along the lateral direction, each signal The terminal 3 includes a signal holding portion 31 , a signal contact portion 32 extending forward from the signal holding portion 31 , and a signal soldering portion 34 extending backward from the signal holding portion 31 .

In the embodiment shown in the present invention, two sets of the aforementioned signal terminals 3 are arranged on the sides of the two aforementioned docking spaces 110, and each set of signal terminals 3 includes two rows of signal contact portions 32 arranged opposite to each other in the height direction, and The signal soldering portions 32 of the two rows of signal terminals 3 are arranged in an offset direction in the front-rear direction. In other embodiments, a set of signal terminals 3 can also be provided only on the side of one of the docking spaces 110 as required.

Please refer to the first figure to the fifth figure, the above-mentioned circuit board 4 has a pair of protrusions 41 protruding from its front side and a limiting groove 42 adjacent to the inner side of the corresponding protrusions 41, the aforementioned pair of protrusions 41 protrude forward into the aforementioned limit card slot 124 on the same side respectively, and the aforementioned limit bar 123 is inserted into the aforementioned limit slot 42 backward, so as to form a cross-type limit fit, thereby better aforesaid circuit board 4 The limit is fixed on the aforementioned insulating body 1 . The rear surface 1231 of the aforementioned limiting bar 123 abuts backward against the lateral inner wall surface defining the aforementioned limiting groove 42. Since the rear surface 1231 of the aforementioned limiting bar 123 is an arc-shaped surface, it can not only guide the protruding portion 41 to a certain extent. It can also avoid damage to the circuit board 4.

In the present invention, the welding parts 24 of the power terminals 2 in the same terminal group 2G are connected to the same side of the aforementioned circuit board 4, and the welding parts 24 of the power terminals 2 in two different terminal groups 2G are connected to the aforementioned circuit board 4 different sides.

Similarly, the signal soldering portion 34 of a group of signal terminals 3 corresponding to the same docking space 110 is connected to the same side of the aforementioned circuit board 4, and is connected to the signal soldering portion 34 of a group of signal terminals 3 corresponding to another docking space 110 On the opposite side of the above-mentioned circuit board 4, the power terminal 2 and the signal terminal No. terminals 3 are connected to both sides of the aforementioned circuit board 4, thereby saving the space of the circuit board 4 and making the soldering operation more convenient.

In this embodiment, the holding portions 21 of the aforementioned power terminals 2 are arranged in eight rows in the height direction, but the aforementioned welding portions 24 corresponding to the eight rows of holding portions 21 are arranged in two rows in the height direction, and also arranged in two rows in the front-rear direction. They are only arranged in two rows, so as to simplify the circuit arrangement of the circuit board 4 and facilitate subsequent welding operations.

The electrical connector 100 of the present invention transmits a large current through the design of double-layer docking space to connect with the power supply unit, thereby greatly increasing the power of the product and supporting the continuous upgrade of the power supply unit; in addition, by connecting the power supply terminal 2 The part 23 is set to extend in the same direction from the front end of the corresponding holding part 21, the welding part 24 is set to extend in the same direction from the rear end of the corresponding holding part 21, and the extending direction of the aforementioned welding part 24 is opposite to the extending direction of the aforementioned contact part 23, While transmitting a large current, the overall height of the electrical connector 100 can be reduced, the space of the circuit board 4 can be saved and the subsequent welding operation can be facilitated.

In particular, it should be pointed out that for those of ordinary skill in the art, the equivalent changes to the present invention made under the teaching of the present invention should still be included in the claimed scope of the patent application of the present invention.

100: electrical connector

11: Main body

12: Extension wall

131: partition

21: Holding part

23: contact part

24: Welding part

25: Connecting part

26: Connection Department

4: Circuit board

Claims (10)

An electrical connector, comprising an insulating body and a plurality of power terminals fixed to the insulating body, the insulating body is formed with at least two docking spaces stacked along the height direction, the plurality of power terminals form a plurality of terminal groups, each terminal The set includes a first terminal combination and a second terminal combination, and each power terminal includes a holding part fixed in the aforementioned insulating body, a contact part protruding from one end of the holding part into the docking space, and extending from the other end of the holding part to form The contact parts of the first terminal combination and the second terminal combination in the same terminal group are relatively arranged in the same docking space, wherein the aforementioned contact parts extend in the same direction from the front end of the corresponding holding part, and the aforementioned welding parts extend from the corresponding The rear end of the part extends in the same direction, and the extension direction of the aforementioned welding part is opposite to that of the aforementioned contact part. The upper parts are opposite and arranged at intervals to form a plugging space for circuit boards to be inserted. According to the electrical connector described in item 1 of the scope of the patent application, the above-mentioned welding parts are all located between the top surface and the bottom surface of the above-mentioned insulating body in the height direction. The electrical connector described in item 1 of the scope of the patent application, wherein the welding parts of the power terminals in each of the aforementioned terminal groups are arranged in two rows in the front-back direction, and the welding parts in each row are arranged side by side in the lateral direction. In the electrical connector described in item 3 of the scope of the patent application, in the front-rear direction, the welding portion of the first terminal assembly is located behind the welding portion of the second terminal assembly. The electrical connector described in item 4 of the scope of the patent application, wherein the holding portions of the power terminals in each of the aforementioned terminal groups are arranged along the aforementioned height direction, and the holding portions of the aforementioned first terminal assembly are arranged along the height direction of the aforementioned insulating body Arranged and arranged, the holding parts of the aforementioned second terminal assemblies are arranged and arranged along the height direction of the aforementioned insulating body. The electrical connector as described in any one of items 1 to 5 of the scope of the patent application, wherein each of the aforementioned power terminals also has a connecting portion connecting its holding portion with its soldering portion, and the aforementioned connecting portion has elasticity so that the aforementioned soldering portion Displacement can occur in the height direction, thereby making the distance between the welding parts of the terminal groups in different docking spaces variable in the height direction. The electrical connector as described in any one of items 1 to 2 of the scope of the patent application, wherein the insulating body has a pair of slots arranged on both sides in the transverse direction, and each of the aforementioned slots faces from the rear end of the insulating body The front recess is formed for rear-to-front insertion of the circuit board. The electrical connector as described in item 7 of the scope of the patent application, wherein each of the aforementioned slots is provided with a limiting column and a limiting card slot located outside the aforementioned limiting column, and the aforementioned circuit board has a protruding one of its front sides For the protruding part and the limiting groove adjacent to the inner side of the corresponding protruding part, the aforementioned pair of protruding parts protrude forward into the aforementioned limiting card slot on the same side respectively, and the aforementioned limiting bar is inserted backward into the aforementioned limiting groove . The electrical connector as described in claim 8 of the patent application, wherein the rear surface of the limiting bar is located on the front side of the rear end of the insulating body, and the rear surface of the limiting bar is arc-shaped. An electrical connector, comprising an insulating body and a plurality of power terminals fixed to the insulating body, the insulating body is formed with at least two docking spaces stacked along the height direction, the plurality of power terminals form a plurality of terminal groups, each terminal The set includes a first terminal combination and a second terminal combination, and each power terminal includes a holding part fixed in the aforementioned insulating body, a contact part protruding from one end of the holding part into the docking space, and extending from the other end of the holding part to form The contact parts of the first terminal combination and the second terminal combination in the same terminal group are relatively arranged in the same docking space. The aforementioned contact parts extend in the same direction from the front end of the corresponding holding part. The rear end is formed by extending in the same direction, and the extension direction of the aforementioned welding portion is opposite to that of the aforementioned contact portion, wherein each of the aforementioned power terminals also has a connecting portion connecting its holding portion with its welding portion, and the front The connection part has elasticity so that the welding part can be displaced in the height direction, and then the distance between the welding parts of the terminal groups in different docking spaces can be changed in the height direction.

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