DE102023102000A1 - Connector part for a charging system for charging an electric vehicle - Google Patents

Abstract

A plug connector part (5) for a charging system for charging an electric vehicle (4) comprises a plug section (501) for plugging into a mating plug connector part (3), at least one plug contact (51A, 51B) arranged on the plug section (501) for electrically contacting a mating contact element (31) of the mating plug connector part (3), an electrically conductive surface element (54) connected to the at least one plug contact (51A, 51B) and extending flatly along a first extension plane (P1), and a temperature sensor assembly (56) which has a circuit board (560) and a temperature sensor element (561) arranged on the circuit board (560) for measuring heating at the at least one plug contact (51A, 51B). The circuit board (560) extends flatly along a second extension plane (P2) parallel to the first extension plane (P1), wherein the temperature sensor element (561) is arranged on a side (563) of the circuit board (560) facing the surface element (54) and an intermediate element (562) made of an elastic plastic material is arranged between the circuit board (560) and the surface element (54).

Description

The invention relates to a connector part for a charging system for charging an electric vehicle according to the preamble of claim 1 and a charging system for charging an electric vehicle.

Such a connector part comprises a plug section for plugging into a mating connector part, at least one plug contact arranged on the plug section for electrically contacting a mating contact element of the mating connector part, an electrically conductive surface element connected to the at least one plug contact, which extends flatly along a first extension plane, and a temperature sensor assembly for measuring heating at the at least one plug contact. The temperature sensor assembly has a circuit board and a temperature sensor element arranged on the circuit board.

Such a connector part can be designed in particular as a charging socket and arranged on an electric vehicle. A mating connector part in the form of a charging plug arranged on a charging cable can be connected to such a charging socket in order to establish an electrical connection between a charging station and the electric vehicle and to electrically charge the electric vehicle.

In the field of electromobility, it is desirable to charge electric vehicles quickly and efficiently in order to reduce charging times and the associated interruption times. In order to enable an electric vehicle to be charged quickly as part of a fast charging process, high charging powers are used, combined with large charging currents, for example with a current of 700 A or even more.

The arrangement and dimensioning of electrical contact elements on connector parts for charging an electric vehicle is usually prescribed by standards. Contact geometries on such connector parts cannot therefore be easily scaled in order to potentially achieve a greater current-carrying capacity on the contact elements. One challenge is therefore to enable the greatest possible power transmission with existing contact geometries.

When large charging currents are transmitted, the contact elements and other components of the connector part become warm. It is stipulated that heating of a connector part must not exceed 50 K. If large charging currents are used, care must be taken to ensure that the connector part does not become excessively warm.

For this reason, a connector part of the type in question here is provided with temperature monitoring, for which heating at a respective plug contact is monitored by means of a temperature sensor module. Depending on heating at the plug contact, countermeasures can be initiated in this way as soon as the heating approaches a permissible limit or exceeds such a limit.

Typically, as a countermeasure, when excessive heating is detected during a charging process using a charging current in the form of an alternating current, a shutdown is initiated. During a charging process using a charging current in the form of a direct current, on the other hand, the charging current is usually regulated down before a permissible limit is reached, so that heating approaches the permissible limit but does not exceed it. The more accurately a temperature measurement is carried out in this context, the more precisely the charging current can be regulated so that heating is limited to a permissible level, but the maximum possible charging current is still transmitted within the permissible heating, thus enabling efficient charging of an electric vehicle.

When measuring the temperature at a plug contact, it is desirable that the temperature at the plug contact is recorded as accurately as possible and with as little time delay as possible. However, it is also important to ensure that a temperature sensor assembly is reliably electrically insulated from an associated plug contact, even at the high voltages that are common in a charging system, so that a voltage flashover cannot occur between the plug contact and the temperature sensor assembly.

In one of the EN 10 2020 126 192 A1 In the known temperature detection device for a connector part, a locking element is arranged on a contact element. A sensor holder is arranged on the locking element, which attaches a temperature sensor to the locking element.

In one of the EP 3 402 012 A1 known connector part is a temperature sensor via a heat-conducting element made of silicone is connected to an associated plug contact.

The object of the present invention is to provide a connector part which enables reliable temperature measurement with reliable electrical insulation between a temperature sensor element and an associated plug contact.

This object is solved by an article having the features of claim 1.

Accordingly, the circuit board extends flatly along a second extension plane parallel to the first extension plane, wherein the temperature sensor element is arranged on a side of the circuit board facing the surface element and an intermediate element made of an elastic plastic material is arranged between the circuit board and the surface element.

The plug contact is connected to a surface element via which, for example, an electrical load line can be connected to the plug contact. The plug contact is used to make electrical contact with a mating contact element of a mating connector part and is designed for plug-in connection with the mating contact element. For example, the plug contact can be designed as a contact pin or as a contact socket and can be plugged into a complementary mating contact element of the mating connector part designed as a contact socket or contact pin.

The surface element extends flatly along a first extension plane and consists of an electrically conductive material so that, for example, a charging current between the plug contact and a connected electrical load line can be conducted via the surface element. The surface element can be made of a copper material, for example a pure copper material or a copper alloy.

In order to carry out a temperature measurement on the plug contact, the circuit board of the temperature sensor assembly is arranged in relation to the surface element such that the circuit board extends along a second extension plane parallel to the first extension plane of the surface element and is thus arranged in a parallel plane relative to the surface element. The temperature sensor element is arranged on a side of the circuit board facing the surface element so that the temperature sensor element points towards the surface element and can thus absorb heating on the surface element, which is at least approximately at the temperature of the plug contact.

The temperature sensor element can, for example, be designed as a so-called SMD component, arranged on the circuit board and connected to the circuit board via a solder connection (SMD: Surface Mounted Device). Because the temperature sensor element is arranged on a side of the circuit board facing the surface element, the temperature sensor element is arranged between the circuit board and the surface element connected to the plug contact and is therefore located in a gap between a circuit board surface and the surface element.

The intermediate element made of an elastic plastic material, for example a silicone material, is arranged in this gap between the circuit board and the surface element. The gap between the circuit board and the surface element is thus at least partially filled by the intermediate element. Because the intermediate element is made of an elastic plastic material and is therefore (soft-)elastic, tolerances in the position between the circuit board and the surface element can be compensated. In addition, the thermal coupling between the temperature sensor element on the circuit board and the surface element can be improved, reducing heat losses, in particular convective losses, in the heat transfer between the surface element and the temperature sensor element.

In particular, the temperature sensor element can be arranged on the intermediate element, for example by embedding the temperature sensor element in the material of the intermediate element. The temperature sensor element is attached to the circuit board. The intermediate element rests on the circuit board in the area of the temperature sensor element and thus covers the temperature sensor element. Because the intermediate element made of an elastic plastic material is (soft) elastic, the intermediate element can nestle against the temperature sensor element and thus embed the temperature sensor element, so that the temperature sensor element is surrounded by the material of the intermediate element where it is not in contact with the circuit board.

In one embodiment, the intermediate element is made of a soft elastic material, in particular a rubber material or a silicone material. The intermediate element can, for example, be made of a conventional silicone material, for example a conventional sealing silicone.

Advantageously, the silicone material can have an increased temperature resistance, for example greater than 200°C, preferably greater than 500°C.

In one embodiment, the intermediate element is made of an elastic plastic material, for example a silicone material, containing a ceramic filler. By using a ceramic filler, the thermal conductivity of the elastic plastic material can be increased while at the same time providing good electrical insulation. The thermal conductivity can be, for example, greater than 1.5 W/mK, for example greater than 2.0 W/mK, preferably greater than 3.0 W/mK, more preferably greater than 5.0 W/mK.

Aluminium oxide, aluminium nitride or boron nitride, for example, can be used as a ceramic filler, which is added to the silicone base material in particle form.

A silicone material in the form of a heat-conducting silicone rubber composition is used, for example, in the EP 1 331 248 B1 described and can be used for the intermediate element.

In one embodiment, the intermediate element is designed as a heat-conducting silicone pad that is accommodated between the circuit board of the temperature sensor assembly and the surface element of the plug contact. Such a silicone pad can, for example, have a thickness equal to or greater than 0.5 mm, for example equal to or greater than 1 mm, preferably equal to or greater than 2 mm.

In one embodiment, the intermediate element is pressed between the circuit board and the surface element. By pressing the intermediate element between the circuit board and the surface element, it can be achieved in particular that the temperature sensor element is embedded in the material of the intermediate element and that the intermediate element fits snugly against the temperature sensor element. By compressing the intermediate element and by setting a contact pressure between the intermediate element and the surface element on the one hand and the intermediate element and the circuit board and the temperature sensor element arranged thereon on the other hand, advantageous heat transfer and advantageous heat conduction can also be achieved on the intermediate element. For example, by pressing, a compression rate on the intermediate element can be set in a range between 10% and 40%. A contact pressure between the intermediate element and the surface element on the one hand and between the intermediate element and the circuit board on the other hand can be, for example, greater than 5 kPa, preferably greater than 10 kPa.

By arranging the intermediate element in a gap between the circuit board carrying the temperature sensor element and the surface element, a robust arrangement is created in which tolerances in the position between the circuit board and the surface element can be compensated due to the elasticity of the intermediate element. The intermediate element can also improve heat transfer, in particular by reducing heat losses in the heat transfer between the surface element and the temperature sensor element due to convection.

In one embodiment, the at least one plug contact is connected to the surface element via a positive connection and/or a material connection. A positive connection can be made, for example, via a rivet connection. A material connection, on the other hand, can be made, for example, by a welded or soldered connection. A positive connection can be used to achieve a mechanically firm hold of the plug contact on the surface element. In particular, a small electrical contact resistance can be created between the plug contact and the surface element via the material connection.

In one embodiment, the plug contact has a contact section for establishing an electrically contacting plug connection with an associated mating contact element of a mating connector part. The contact section can, for example, have the shape of a contact pin or the shape of a contact socket. The mating contact element is shaped accordingly in a complementary manner and has the shape of a contact socket or a contact pin. When the connector part is connected to the mating connector part, the plug contact is connected to the associated mating contact element via the contact section, so that an electrical connection is established.

In one embodiment, the connector part has a connection element connected to the surface element for connecting an electrical load line to the at least one plug contact. An electrical load line is connected to the surface element via the connection element and via this to the associated plug contact, so that an electrical load current, in particular a charging current in the form of a direct current, can be conducted via the load line, the connection element, the surface element and the plug contact. The surface element creates an electrical connection between the connection element and the associated plug contact.

In one embodiment, the connection element has a shaft section for connecting to the electrical load line. For example, a threaded hole for producing a screw connection can be formed on the (cylindrical) shaft section. An associated load line can be attached to the shaft section via a cable lug, for example, and connected to the shaft section via a screw connection, so that the load line is mechanically fixed to the connection element and electrically connected to the connection element.

In one embodiment, the connection element is connected to the surface element via a form-fitting connection and/or a material connection. A form-fitting connection can be made, for example, via a rivet connection. A material connection, on the other hand, can be made, for example, by a welded or soldered connection. A form-fitting connection can be used to achieve a mechanically firm hold of the connection element on the surface element. In particular, a small electrical contact resistance can be created between the connection element and the surface element via the material connection.

In one embodiment, the at least one plug contact protrudes from a first side of the surface element. The connection element, in contrast, protrudes from a second side of the surface element facing away from the first side. The plug contact on the one hand and the connection element on the other hand are thus arranged on different sides of the surface element and protrude from the surface element on different sides.

In one embodiment, the at least one plug contact extends along a first longitudinal axis directed perpendicular to the first plane of extension to the surface element. The connection element, on the other hand, extends along a second longitudinal axis directed perpendicular to the first plane of extension to the surface element. Both the connection element and the plug contact thus extend perpendicular to the planar plane of extension of the surface element and thus protrude perpendicularly from the surface element.

The attachment location of the connection element on the surface element and the attachment location of the plug contact on the surface element are preferably spatially separated from one another. In particular, the at least one plug contact and the connection element can be spaced apart from one another along a direction pointing transversely to the first longitudinal axis and the second longitudinal axis. The plug contact and the connection element are thus spatially offset from one another transversely to the longitudinal axes, with the plug contact and the connection element preferably protruding from the surface element on sides facing away from one another.

The connector part has one or more plug contacts which, when the connector part is plugged into an associated mating connector part, engage with an associated mating contact element of the mating connector part and thus establish electrical contact between the connector part and the mating connector part. The plug contacts can, for example, each be designed to transmit a charging current in the form of a direct current, with each plug contact being electrically connected to an associated surface element and, via this, preferably to an associated connection element to which a load line for transmitting the charging current is connected when the connector part is in the normal operating state.

A charging system for charging an electric vehicle comprises a connector part of the type described above. Such a charging system also comprises a mating connector part that can be plugged into the connector part. The connector part can be arranged on the electric vehicle as a charging socket, for example. The mating connector part, on the other hand, can be a charging plug, for example, which is arranged on a charging cable and can be connected to the connector part in the form of the charging socket. The charging plug can be connected to a charging station via the charging cable, for example, so that when the connector part and the mating connector part are connected, charging currents can be transmitted from the charging station to the electric vehicle.

A connector part of the type described here can be used in particular for transmitting charging currents in the form of direct currents. However, such a connector part can also be used for transmitting charging currents in the form of alternating currents.

• 1 eine Ansicht einer Ladestation mit einem daran angeordneten Ladekabel zum Verbinden mit einem Elektrofahrzeug;
• 2 eine Ansicht eines Steckverbinderteils in Form eines Ladesteckers;
• 3 eine Ansicht eines Ausführungsbeispiels eines Steckverbinderteils in Form einer Ladebuchse an einem Elektrofahrzeug;
• 4 eine andere Ansicht des Steckverbinderteils; und
• 5 eine Ansicht einer Kontaktbaugruppe umfassend einen Steckkontakt, ein Flächenelement und ein Anschlusselement.

The idea underlying the invention will be explained in more detail below using the embodiments shown in the figures. They show:

• 1 a view of a charging station with a charging cable arranged thereon for connecting to an electric vehicle;
• 2 a view of a connector part in the form of a charging plug;
• 3 a view of an embodiment of a connector part in the form of a charging socket on an electric vehicle;
• 4 another view of the connector part; and
• 5 a view of a contact assembly comprising a plug contact, a surface element and a connection element.

1 shows a charging system comprising a charging station 1, which is used to charge an electrically powered vehicle 4, also referred to as an electric vehicle. The charging station 1 is designed to provide a charging current in the form of an alternating current or a direct current and has a cable 2, which is connected at one end 201 to the charging station 1 and at another end 200 to a mating connector part 3 in the form of a charging plug.

As can be seen from the enlarged view according to 2 As can be seen, the mating connector part 3 has plug sections 300, 301 on a housing 30, with which the mating connector part 3 can be plugged into an associated connector part 5 in the form of a charging socket on the vehicle 4. In this way, the charging station 1 can be electrically connected to the vehicle 4 in order to transmit charging currents from the charging station 1 to the vehicle 4.

In a 3 and 4 In the illustrated embodiment of a connector part 5 in the form of a charging socket to be arranged on an electric vehicle 4, plug sections 500, 501 are formed on a housing 50, which can be connected along the plug direction E to the plug sections 300, 301 of the mating connector part 3 in the form of the charging plug in order to produce a mechanical plug connection between the charging plug 3 and the charging socket 5.

In the embodiment shown, contact elements 52 for transmitting an alternating current and also control contacts are arranged on an upper plug section 500 of the plug connector part 5. In contrast, plug contacts 51A, 51B for transmitting a charging current in the form of a direct current are arranged on a lower plug section 501.

The plug contacts 51A, 51B can be designed, for example, as pin contacts and, when the plug connector part 5 in the form of the charging socket is plugged into the mating plug connector part 3 in the form of the charging plug, come into electrical engagement with associated mating contact elements 31 on the plug section 301, so that an electrical connection is established between the plug connector part 5 and the mating plug connector part 3.

The plug contacts 51A, 51B are each connected to a load line 53A, 53B, which is inserted into the housing 50 and laid within the electric vehicle 4 to carry the charging current.

In order to enable rapid charging of the electric vehicle 4, e.g. as part of a so-called quick charging process, the transmitted charging currents have a high current intensity, e.g. greater than 500 A, possibly even in the order of 700 A or more. Due to such high charging currents, thermal losses occur on the cable 2 and also on the charging plug 3 and the charging socket 5, which lead to heating of the cable 2, the charging plug 3 and the charging socket 5.

The permissible heating of components of the charging system is limited by standards, for example to a maximum value of 50 K. It follows that measures must be taken to prevent excessive heating during charging, especially when high currents, for example in the order of 700 A or more, are used.

In the connector part 5, each plug contact 51A, 51B is connected to an associated load line 53A, 53B. As shown in 5 As shown, each plug contact 51A, 51B is arranged on an associated surface element 54 and electrically connected to the electrically conductive surface element 54. A connection element 55 is also arranged on the surface element 54 and is electrically conductively connected to the surface element 54, wherein a load line 53A, 53B associated with the respective plug contact 51A, 51B is connected to the connection element 55 and is thus connected to the associated plug contact 51A, 51B.

In the embodiment shown, the surface element 54 extends as a surface element along an extension plane P1. The associated plug contact 51A, 51B protrudes from the surface element 54 with a pin-shaped contact section 510 in the embodiment shown along a longitudinal axis L1 perpendicular to the extension plane P1 and thus protrudes perpendicularly from the surface element 54 on a first side 543. At an end 511 facing the surface element 54, the plug contact 51A, 51B engages in an opening in the surface element 54 and is, for example, positively connected, for example via a rivet connection, to the surface element 54. Alternatively or additionally, the plug contact 51A, 51B can be connected to the surface element 54 in a materially bonded manner, for example via a welded connection.

The connection element 55, on the other hand, extends along a second longitudinal axis L2 and protrudes from the surface element 54 on a second side 544 facing away from the first side 543. The plug contact 51A, 51B on the one hand and the connection element 55 on the other hand thus extend to different sides of the surface element 54.

The connection element 55 has a shaft section 550 in which a threaded bore 552 is formed. A screw element 531 passes through a cable lug 530 to which the associated load line 53A, 53B is attached and engages in the threaded bore 552 so that the cable lug 530 and, above it, the load line 53A, 53B are connected to the connection element 55 via a screw connection.

At an end 551 facing the surface element 54, the connection element 55 engages in an opening on the surface element 54 and is secured to the surface element 54 in a form-fitting manner, for example via a rivet connection. Additionally or alternatively, the connection element 55 can be connected to the surface element 54 via a material-locking connection, in particular a welded connection.

The longitudinal axes L1, L2 each extend perpendicularly to the extension plane P1 of the surface element 54. The longitudinal axes L1, L2 are spaced apart from one another along a direction transverse to the longitudinal axes L1, L2, so that the plug contact 51A, 51B and the connection element 55 are connected to the surface element 54 in a transversely offset manner and are thus spatially spaced apart from one another along the extension plane P1.

The contact assembly has a temperature sensor assembly 56, which serves to detect heating at the plug contact 51A, 51B. The temperature sensor assembly 56 has a circuit board 560, which extends flatly along an extension plane P2, which is directed parallel to the extension plane P1 of the surface element 54. The circuit board 560 and the surface element 54 thus extend parallel to one another along parallel planes P1, P2.

On a side 563 facing the surface element 54, the circuit board 560 carries a temperature sensor element 561, which is designed, for example, as a so-called SMD component and is connected to the surface of the circuit board 560 in particular via a solder connection. The temperature sensor element 561 faces the first side 543 of the surface element 54, from which the plug contact 51A, 51B protrudes.

An intermediate element 562 made of an elastic plastic material, in particular a silicone material, is arranged in a space between the circuit board 560 and the surface element 54. The intermediate element 562 is preferably pressed between the circuit board 560 and the surface element 54, so that the intermediate element 562 made of an elastically soft plastic material, in particular a silicone material, embeds the temperature sensor element 561 in that the intermediate element 562 fits snugly against the temperature sensor element 561.

By pressing, the intermediate element 562 is preferably compressed between the circuit board 560 and the surface element 54. A compression rate caused by pressing can be, for example, between 10% and 40% (based on the volume of the intermediate element 562 before pressing).

The intermediate element 562 is made, for example, of a silicone material and is thus (high-) temperature resistant, with a temperature resistance preferably greater than 200 °C, preferably greater than 500 °C. In addition, the intermediate element 562 can provide good electrical insulation with high dielectric strength.

The intermediate element 562 has, for example, the form of a silicone pad which is arranged for assembly between the circuit board 560 and the surface element 54 and is pressed between the circuit board 560 and the surface element 54.

The intermediate element 562 can, for example, be made of a conventional sealing silicone.

In one embodiment, the intermediate element 562 is made of a thermally conductive silicone material, for example a silicone material containing a ceramic filler such as aluminum oxide, aluminum nitride or boron nitride.

The idea underlying the invention is not limited to the embodiments described above, but can also be implemented in other ways.

A contact assembly of the type described can, for example, be part of a connector part in the form of a charging socket on the side of a electric vehicle. Such a contact assembly can also be part of a connector part in the form of a charging plug on a charging cable.

List of reference symbols

1

Charging station

2

Charging cable

200,201

End

3

Charging plug

30

Housing

300, 301

Plug-in section

31

Counter contact element

4

vehicle

5

Charging socket

50

Housing

500, 501

Plug-in section (receiving socket)

502

Rear cover

51A, 51B

Plug contact

510

Contact section

511

End

52

Contact elements

53A, 53B

Load line

530

Cable lug

531

Screw element

54

Surface element

543,544

Page

55

Connection element

550

Shaft section

551

End

552

Threaded hole

56

Temperature sensor assembly

560

circuit board

561

Temperature sensor element

562

Intermediate element

563

Page

E

Insertion direction

L1, L2

Longitudinal axis

P1, P2

Extension plane

QUOTES INCLUDED IN THE DESCRIPTION

This list of documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions.

Cited patent literature

• DE 102020126192 A1 [0010]
• EP 3402012 A1 [0011]
• EP 1331248 B1 [0025]

Claims (17)

Plug connector part (5) for a charging system for charging an electric vehicle (4), with a plug section (501) for plugging into a mating plug connector part (3), at least one plug contact (51A, 51B) arranged on the plug section (501) for electrically contacting a mating contact element (31) of the mating plug connector part (3), an electrically conductive surface element (54) connected to the at least one plug contact (51A, 51B) and extending flatly along a first plane of extension (P1), and a temperature sensor assembly (56) which has a circuit board (560) and a temperature sensor element (561) arranged on the circuit board (560) for measuring heating at the at least one plug contact (51A, 51B), characterized in that the circuit board (560) extends flatly along a second plane of extension (P2) parallel to the first plane of extension (P1), wherein the Temperature sensor element (561) is arranged on a side (563) of the circuit board (560) facing the surface element (54) and an intermediate element (562) made of an elastic plastic material is arranged between the circuit board (560) and the surface element (54). Connector part (1) according to Claim 1 , characterized in that the temperature sensor element (561) is arranged on the intermediate element (562). Connector part (1) according to Claim 1 or 2 , characterized in that the intermediate element (562) is made of a soft elastic material, in particular a rubber material or a silicone material. Connector part (1) according to one of the Claims 1 until 3 , characterized in that the intermediate element (562) is made of an elastic plastic material containing a ceramic filler. Connector part (1) according to one of the preceding claims, characterized in that the intermediate element (562) is a heat-conducting silicone pad. Connector part (1) according to one of the preceding claims, characterized in that the intermediate element (562) is pressed between the circuit board (560) and the surface element (54). Plug connector part (5) according to one of the preceding claims, characterized in that the at least one plug contact (51A, 51B) is connected to the surface element (54) via a positive connection and/or a material connection (513). Connector part (5) according to one of the preceding claims, characterized in that the at least one plug contact (51A, 51B) has a contact section (510) for establishing an electrically contacting plug connection with the mating contact element (31). Connector part (1) according to one of the preceding claims, characterized by a connection element (55) connected to the surface element (54) for connecting an electrical load line (53A, 53B) to the at least one plug contact (51A, 51B). Connector part (1) according to Claim 8 , characterized in that the connecting element (55) has a shaft portion (550) for connecting to the electrical load line (53A, 53B). Connector part (1) according to Claim 9 , characterized in that the shaft portion (550) has a threaded bore (552) for producing a screw connection for connecting the connection element (55) to the electrical load line (53A, 53B). Connector part (5) according to one of the Claims 8 until 10 , characterized in that the connecting element (55) is connected to the surface element (54) via a positive connection and/or a material connection (513). Connector part (5) according to one of the Claims 8 until 11 , characterized in that the at least one plug contact (51A, 51B) protrudes from a first side (543) of the surface element (54) and the connection element (55) protrudes from a second side (544) of the surface element (54) facing away from the first side (543). Connector part (1) according to one of the Claims 8 until 12 , characterized in that the at least one plug contact (51A, 51B) extends along a first longitudinal axis (L1) directed perpendicular to the first extension plane (P1) to the surface element (54) and the connection element (55) extends along a second longitudinal axis (L1) directed perpendicular to the first extension plane (P1) to the surface element (54). Connector part (1) according to Claim 13 , characterized in that the at least a plug contact (51A, 51B) and the connection element (55) are spaced apart from one another along a direction transverse to the first longitudinal axis (L1) and the second longitudinal axis (L2). Charging system for charging an electric vehicle (4), with a connector part (5) according to one of the preceding claims. Charging system according to Claim 15 , characterized in that the connector part (5) is a charging socket arranged on the electric vehicle (4).