Contact pin unit for plug connection element and plug connection element

Abstract

The invention relates to a contact pin unit (1) and a plug connection element having a contact pin unit (1) for producing a power transmission connection. The contact pin unit (1) has an electrically conductive fixing body (2), an internal thread which is arranged or can be arranged in the fixing body (2) along a main longitudinal central axis (7) of the contact pin unit (1), an electrically conductive contact pin body (3) which is produced separately from the fixing body (2), and a sensor contact body (4) which is connected or can be connected to the contact pin body (3) and the fixing body (2). In the fully assembled state of the contact pin unit (1), the fixing body (2), the contact pin body (3) and the sensor contact body (4) are each connected to the internal thread (5) in a force-fitting, form-fitting and / or material-bonded manner along the main longitudinal center axis (7) in an electrically conductive manner.

Description

Technical Field

[0001] The invention relates to a contact pin unit of a plug connection element for producing an electrical energy transmission connection, and to a plug connection element having a contact pin unit. Background Art

[0002] In the automotive industry, plug-in connectors used to create a charging plug connection between the power grid and the vehicle's traction battery for transferring electrical energy have been standardized in terms of contact elements (pins, pin receivers). Plug-in connectors other than the contact elements are currently not standardized or otherwise regulated. This leaves vehicle manufacturers free to design plug-in connectors other than the contact elements. Consequently, plug-in connector manufacturers currently need to maintain or manufacture a wide variety of different plug-in connectors. Summary of the Invention

[0003] The object of the present invention is to enable the production of different plug connector variants to be as simple as possible.

[0004] According to the present invention, a contact pin unit for a plug-in connection element for generating electrical energy transmission is proposed. Furthermore, according to the present invention, a plug-in connection element for an energy transmission connection is proposed. The plug-in connection element is designed, for example, as a charging plug and a charging socket. In particular, the plug-in connection element (i.e., the charging plug and the charging socket) is designed for a purely electric or hybrid motor vehicle, wherein electrical energy can be transmitted between the power supply grid and the vehicle's power battery via the energy transmission connection. In any case, the plug-in connection element has a contact pin unit. In other words, when the contact pin unit is installed as intended, it forms an integral part of the plug-in connection element.

[0005] The contact pin unit has: Conductive fixed body, an internal thread arranged or arrangeable in the fixing body along the main longitudinal center axis of the contact pin unit, a conductive contact pin body manufactured separately from the fixing body, and A sensor contact body that is connected or connectable to a contact pin body and a fixing body.

[0006] In the fully assembled state of the contact pin unit, the fixing body, the contact pin body and the sensor contact body are electrically conductively connected to one another along the main longitudinal center axis in a force-fitting, form-fitting and / or materially bonded manner, wherein the internal thread is arranged in the fixing body parallel to or coaxially with the main longitudinal center axis. In the fully assembled state of the contact pin unit, at least the fixing body and the contact pin body and the internal thread are connected to one another in a torsionally fixed manner. Here, the fixing body and the internal thread are connected to one another in a force-fitting, form-fitting and / or materially bonded manner. In particular, an electrically conductive contact pin is mounted on the contact pin body, said contact pin protruding from the contact pin body along the main longitudinal center axis. Here, the contact pin and the contact pin body are electrically conductively connected to one another, so that in the fully assembled state of the contact pin unit, the fixing body and the contact pin are electrically conductively connected to one another. In particular, the contact pin is a standardized component, while the fixing body, the contact pin body, the sensor contact body and the internal thread are non-standardized components.

[0007] The structure of the contact pin unit described above allows for the simple and efficient production of a variety of different contact pin unit variants, each of which has a unique contact pin variant. This makes it particularly easy and efficient to comply with different design specifications, such as those prescribed by different vehicle manufacturers. According to the present invention, a one-piece design of the contact pin unit is deliberately avoided. This results in a high degree of flexibility in the design of the contact pin unit variants.

[0008] In another possible embodiment, the internal thread is formed in a threaded sleeve manufactured separately from the fixed body, wherein the fixed body has an axial sleeve receptacle arranged along the main longitudinal center axis. The sleeve receptacle and the threaded sleeve are each sized so that the threaded sleeve is pressed into the sleeve receptacle. This means that when the contact pin unit is fully assembled, the threaded sleeve is coaxially inserted into the sleeve receptacle. In particular, the sleeve receptacle and the threaded sleeve correspond to each other so that when the threaded sleeve is inserted into the sleeve receptacle in the fully assembled state of the contact pin unit, the outer circumference of the threaded sleeve and the inner circumference of the sleeve receptacle are in surface contact with each other. Since the threaded sleeve is manufactured separately from the fixed body, the corresponding manufacturing methods for manufacturing the fixed body and the threaded sleeve can be optimally selected and implemented separately, so that no compromises need to be considered when manufacturing the fixed body and the threaded sleeve.

[0009] In a possible refinement, the fixing body is formed from a fixing body material, while the threaded sleeve is formed from a threaded sleeve material, and the two materials are different. In particular, the fixing body is formed from copper, while the threaded sleeve is formed from steel. The copper used for the fixing body is particularly oxygen-containing copper (tough pitch copper) produced by electrolytic refining (Cu-ETP). Threaded sleeves formed from threaded sleeve material (in particular steel) offer advantages in terms of thread depth, strength, manufacturing process, and controllability.

[0010] According to another possible embodiment, a first form-fitting element is arranged on the contact pin body in a rotationally fixed manner, while a second form-fitting element is arranged on the threaded sleeve. The form-fitting elements correspond to each other to produce a form-fitting connection that, when the contact pin unit is fully assembled, prevents both relative rotation of the contact pin body and the threaded sleeve about the main longitudinal center axis and relative translational movement of the contact pin body and the threaded sleeve along the main longitudinal center axis. This prevents the threaded sleeve from moving relative to the fixing element and the contact pin body when the screw element is screwed into the internal thread, allowing the screw element to be screwed into the internal thread particularly securely. This allows the contact pin unit to be particularly securely and reliably connected electrically and mechanically to a conductor element (e.g., a current rail of a motor vehicle's onboard electrical system).

[0011] According to another possible embodiment, the first form-fitting element (i.e., the form-fitting element arranged on the contact pin body) is a form-fitting body receiver, while the second form-fitting element (i.e., the form-fitting element arranged on the threaded sleeve) is a form-fitting body. Both the form-fitting body receiver and the form-fitting body have a configuration that deviates from a right circular cylinder. For example, the form-fitting body receiver and the form-fitting body each have a prismatic configuration. The second form-fitting element or form-fitting body arranged on the threaded sleeve protrudes radially beyond the threaded sleeve, wherein, when the contact pin unit is fully assembled, the portion of the second form-fitting element or form-fitting body that radially protrudes beyond the threaded sleeve is arranged between the contact pin body and the fixed body. The fixed body and the contact pin body are connected to each other by a force-fitting, form-fitting, and / or materially bonded connection when the contact pin unit is fully assembled, wherein the portion of the second form-fitting element that radially protrudes beyond the threaded sleeve is arranged between the contact pin body and the fixed body, and this portion of the second form-fitting element is fixed between the fixed body and the contact pin body along the main longitudinal center axis.

[0012] In an alternative embodiment of the contact pin unit, the internal thread and the fixing body are integrally formed. This means that the internal thread is cut or formed directly on the fixing body. As a result, the contact pin unit advantageously has a particularly small number of parts, resulting in a particularly simple design.

[0013] According to another possible embodiment, when the contact pin unit is fully assembled, the contact pin body and the fixed body are connected to each other by means of a rotary friction welding connection. In other words, the contact pin body and the fixed body are connected to each other by means of a rotary friction welding connection during the manufacturing or assembly of the contact pin unit. For this purpose, it is particularly provided that the fixed body and / or the contact pin body have a torque transmission device, such as an external hexagon, through which the torque required for rotary friction welding can be applied to the fixed body or the contact pin body. Rotary friction welding is a simple and reliable method for quickly and reliably electrically and mechanically connecting the contact pin body and the fixed body.

[0014] In another alternative embodiment of the contact pin unit, a first crimping element is fixed to the fixing body, wherein the second crimping element is fixed to the contact pin body. The crimping elements correspond to one another to produce a force-fit connection, by which the fixing body and the contact pin body are connected to one another along the main longitudinal center axis when the contact pin unit is fully assembled. By producing or forming a force-fit connection or an interference fit connection, the fixing body and the contact pin body are particularly reliably connected to one another.

[0015] In another possible embodiment of the contact pin unit, the sensor contact body and the contact pin body are integrally formed. In another alternative embodiment of the contact pin unit, the sensor contact body and the contact pin body are manufactured separately. This further increases the flexibility and versatility in manufacturing different contact pin unit variants.

[0016] If the fixing body and the contact pin body are connected to each other via a press-fit connection, and the sensor contact body and the contact pin body are manufactured separately from each other, another possible embodiment of the contact pin unit provides for the sensor contact body to be designed as a flat sensor body. This sensor contact body or flat sensor body is characterized in that the direction of extension of the flat sensor body transverse to the main longitudinal center axis predominates over the direction of extension of the flat sensor body along the main longitudinal center axis. According to this refinement, it is further provided that, in the fully assembled state of the contact pin unit, the flat sensor body is fixed along the main longitudinal center axis between the contact pin body and the fixing body. In particular, the flat sensor body directly contacts the contact pin body and the fixing body.

[0017] According to one possible refinement, the flat sensor body has a fastening through-hole, wherein one of the press-fit connection elements is designed as a press pin that extends through the fastening through-hole when the contact pin unit is fully assembled. This means that the other press-fit element is designed as a press-pin receiver corresponding to the press pin, with the press pin having a desired interference fit relative to the press-pin receiver. For example, a first press-fit element fixed to the fixed body may be formed by a press pin, while a second press-fit element fixed to the contact pin body may form a press-pin receiver.

[0018] Even if the sensor contact body and the contact pin body are formed integrally with each other, the fixing body and the contact pin body can also be connected to each other by a press-fit connection. In this case, for example, it is conceivable that the press pin protrudes from the sensor flat body along the main longitudinal center axis.

[0019] In another possible embodiment, the fixing body is made of a different material than the contact pin body. In other words, the fixing body material comprises at least one material that is different from the contact pin body material. For example, the fixing body can be coated with a coating material, while the contact pin body can be uncoated or coated with a different material. Vice versa: the contact pin body can be coated with a coating material, while the fixing body can be uncoated or coated with a different material. This makes it particularly easy to produce a wider range of contact pin unit variants.

[0020] In order to be able to produce more variant embodiments of the contact pin unit, another possible embodiment provides that the contact pin, which is electrically conductively mounted on the contact pin body, protrudes axially from the contact pin body eccentrically with respect to the main longitudinal center axis.

[0021] Further advantages, features, and details of the present invention can be derived from the following description of possible exemplary embodiments and the accompanying drawings. The features and feature combinations mentioned above in the description, as well as the features and feature combinations shown in the following description of the figures and / or in the individual figures, can be used not only in the combination indicated in each case but also in other combinations or alone without departing from the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The pictures are: Figure 1 A perspective view showing a contact pin unit in a not fully assembled state; Figure 2 A perspective view showing the contact pin unit in a fully assembled state; Figure 3 showing a cross-sectional view of a contact pin unit; Figure 4 shows a perspective view of a contact pin unit in a not completely assembled state, the contact pin unit having a crimping element; Figure 5 A perspective view of a contact pin unit in a not completely assembled state is shown, wherein the sensor contact body and the fixing body of the contact pin unit are formed integrally with one another; Figure 6 Perspective view of the contact pin unit in the fully assembled state. DETAILED DESCRIPTION

[0023] The contact pin unit 1 and a plug connection element (not shown in the figures) having this contact pin unit 1 will be explained in the following common description. In the figures, identical and functionally identical elements are provided with the same reference numerals.

[0024] Plug-type connectors are designed for energy transmission connections, via which electrical energy can be transferred between an energy supply network (e.g., a charging station) and the vehicle's power battery. Thus, plug-type connectors can be charging plugs or charging sockets. In particular, plug-type connectors are installed in purely electric or hybrid vehicles.

[0025] Figure 1 、 Figure 4 and Figure 5 The contact pin unit 1 of the plug-type connection element is shown in each case in a perspective view and in a not completely assembled state. Figure 1 、 Figure 4 and Figure 5 Regardless of the possible configuration of the contact pin unit 1 shown in the figures, the contact pin unit 1 has a conductive fixing body 2, a conductive contact pin body 3 manufactured separately from the fixing body 2, and a sensor contact body 4. In addition, the contact pin unit 1 has an internal thread 5 and a contact pin 6. Figure 1 、 Figure 4 and Figure 5 As can be seen in FIG, the contact pin unit 1 can be provided as a kit, ie as individual components or in unassembled form.

[0026] In order to assemble the contact pin unit 1, the fixing body 2, the contact pin body 3, the sensor contact body 4 and the internal thread 5 are electrically conductively connected to each other along the main longitudinal center axis 7 of the contact pin unit 1 in a force-fitting, form-fitting and / or material-bonding manner. Therefore, in the fully assembled state of the contact pin unit 1, the fixing body 2, the contact pin body 3, the sensor contact body 4 and the internal thread 5 and in particular the contact pin 6 are electrically conductively connected to each other along the main longitudinal center axis 7 in a force-fitting, form-fitting and / or material-bonding manner. It should be understood that the longitudinal center axes of the fixing body 2, the contact pin body 3, the sensor contact body 4 and the internal thread 5 and the contact pin 6 can coincide, but do not necessarily have to coincide. On the contrary, one or more longitudinal center axes of the fixing body 2, the contact pin body 3, the sensor contact body 4 and the internal thread 5 and / or the contact pin 6 can be spaced apart in parallel with the main longitudinal center axis 7. Therefore, for example, from Figure 1 、 Figure 2 and Figure 3 As can be seen in the illustration in FIG, the electrically conductive contact pin 6 mounted on the contact pin body 3 protrudes axially eccentrically from the contact pin body 3 relative to the main longitudinal center axis 7. In other words, the longitudinal center axis 8 of the contact pin 6 and the main longitudinal center axis 7 are spaced apart and parallel to each other.

[0027] from Figure 1 、 Figure 2 and Figure 3It can also be seen that the sensor contact body 4 and the contact pin body 3 can be formed integrally with each other. The sensor contact body 4 serves as a temperature sensor element and has a temperature sensing surface 9, on which the current operating temperature of the contact pin unit 1 can be determined or sensed by a temperature sensor.

[0028] from Figure 1 and Figure 3 It can also be seen that the internal thread 5 of the contact pin unit 1 is formed in a threaded sleeve 10 which is produced separately from the fixing body 2. In this case, the fixing body 2 also has an axial sleeve receptacle 11 arranged along the main longitudinal center axis 7, into which the threaded sleeve 10 can be inserted. In the fully assembled state of the contact pin unit 1 (see FIG. Figure 2 、 Figure 3 ), the threaded sleeve 10 is coaxially inserted into the sleeve receiving portion 11, wherein the longitudinal center axis of the threaded sleeve 10 coincides with the longitudinal center axis of the sleeve receiving portion 11. In particular, the longitudinal center axis of the sleeve receiving portion 11 coincides with the main longitudinal center axis 7. Figure 3 It can be clearly seen in FIG. 1 that the threaded sleeve 10 and the sleeve receiving portion 11 are designed so that when the threaded sleeve 10 is inserted into the sleeve receiving portion 11 as intended, the outer circumference 12 of the threaded sleeve 10 and the inner circumference 13 of the sleeve receiving portion 11 are in surface contact with each other.

[0029] According to the present example, the fixing body 2 is made of copper, preferably CU-ETP, while the threaded sleeve 10 is formed of steel.

[0030] The first form-fitting element 14, which is designed here as a form-fitting receptacle 15, is arranged on the contact pin element 3 in a rotationally fixed manner. The second form-fitting element 16, which is designed here as a form-fitting body, is arranged on the threaded sleeve 10 in a rotationally fixed manner. The form-fitting elements 14, 16, i.e. the form-fitting receptacle 15 and the form-fitting body 17, correspond to one another to produce a form fit 18. In the completely assembled state of the contact pin unit 1 (see Figure 3 ) This prevents a relative rotation of the contact pin body 3 and the threaded sleeve 10 about the main longitudinal center axis 7 as well as a relative translational movement of the contact pin body 3 and the threaded sleeve 10 along the main longitudinal center axis 7. For this purpose, the form-fitting body 17 or the second form-fitting element 16 has a raised ring 19 that projects radially out of the threaded sleeve 10. Thus, by fixing the raised ring 19 of the form-fitting body 17 between the fixing body 2 and the contact pin body 3 in the completely assembled state of the contact pin unit 1, a relative translational movement of the threaded sleeve 10 relative to the fixing body 2 or the contact pin body 3 is prevented. Figure 3As can be seen in FIG, the collar 19 of the form-fitting body 17 protrudes radially beyond the maximum inner diameter of the sleeve receptacle 11. By making the form-fitting body receptacle 15 and the form-fitting body 17 each have a configuration different from that of a right circular cylinder, a relative rotation of the threaded sleeve 10 relative to the fixing body 2 or the contact pin 3 is prevented. Figure 1 As can be seen particularly well in FIG, the configuration and shape of the form-fit elements 14, 16 comprise, in this example, prismatic and cylindrical portions.

[0031] Figure 3 In the figure, 20 denotes the rotational friction welded connection of the contact pin unit 1 , wherein the contact pin body 3 and the fixing body 2 are connected to one another via this rotational friction welded connection 20 .

[0032] In this example, it is also provided that the fixing body 2 and the contact pin body 3 differ from each other in at least one material. In other words, it can be provided that the fixing body 2 is made of a material different from that of the contact pin body 3.

[0033] Figure 4 The figure shows a perspective view of a contact pin unit 1 in an incompletely assembled state, wherein the contact pin unit 1 has crimping elements 21 and 22. In this example, the first crimping element 21 is designed as a crimping pin 23, and the second crimping element 22 is designed as a crimping pin receiver 24, wherein the crimping pin 23 and the crimping pin receiver 24 correspond to each other to form an interference connection or a force-fit connection. Figure 4 and Figure 5 As can be seen in the figure, the first crimping element 21, i.e., the press pin 23, is fixed to the fixing body 2 of the contact pin unit 1. The second crimping element 22, i.e., the press pin receptacle 24, is fixed or formed on the contact pin body 3. In the completely assembled state of the contact pin unit 1, the fixing body 2 and the contact pin body 3 are connected to each other along the main longitudinal center axis 7 by a press fit connection, wherein the press fit connection is facilitated by the crimping elements 20, 21 or the press pin 23 connected to the press pin receptacle 24. In particular, the press fit connection and the rotational friction weld connection 20 are provided to be interchangeable.

[0034] As explained above, the sensor contact body 4 and the contact pin body 3 can be designed integrally with each other, as in Figure 1 、 Figure 2 、 Figure 3 and Figure 5 In addition, see Figure 4 , it is possible to manufacture the sensor contact body 4 and the contact pin body 3 separately from each other. Figure 4 In the example of the contact pin unit 1 shown in FIG, the sensor contact body 4 is designed as a sensor flat body 25 and in the fully assembled state of the contact pin unit 1 (see Figure 6 ) is fixed between the contact pin body 3 and the fixed body 2 along the main longitudinal center axis 7. Figure 4 and Figure 5It can be further seen in FIG that the internal thread 5 and the fixing body 2 can be constructed integrally with each other. This means that the internal thread 5 can be directly formed (for example by cutting) in the fixing body 5 or in its fixing body material.

[0035] Figure 4 It is also shown that the flat sensor body 25 can have a fastening through-hole 26, the inner diameter of which is matched to the outer diameter of the press pin 23 such that, when the contact pin unit 1 is completely assembled, the press pin 23 can extend through the fastening through-hole 26. In particular, the inner diameter of the fastening through-hole 26 and the outer diameter of the press pin 23 are matched to each other such that radial movement of the flat sensor body 25 relative to the press pin 23 is prevented.

[0036] The contact pin unit 1 and the plug connection element each make it possible to achieve the technical problem explained above, namely to enable the production of different variant embodiments of the plug connection element to be as simple as possible.

[0037] Reference Signs List 1 Contact pin unit 2 fixed body 3 Contact pin 4 Sensor contacts 5 Internal thread 6 contact pins 7 Main longitudinal center axis 8 Longitudinal center axis of contact pin 9 Temperature sensing surface 10 threaded sleeve 11 sets of receiving parts 12 Outer surface of threaded sleeve 13 sets of inner circumference of the receiving part 14 First form-fitting element 15 Positive-fitting receiving portion 16 Second form-fitting element 17 Shape-fitting body 18 Form Fit 19 raised ring 20 Rotary friction welding connection 21 First crimping element 22 Second crimping element 23 Press Pin 24 Press pin receiving part 25 sensor flat body 26 fixing holes

Claims

1. A contact pin unit (1) of a plug-type connection element for establishing an electrical energy transmission connection, wherein the contact pin unit (1) comprises: a conductive fixed body (2), an internal thread arranged or capable of being arranged in the fixing body (2) along the main longitudinal center axis (7) of the contact pin unit (1), a conductive contact pin body (3) manufactured separately from the fixing body (2), and a sensor contact body (4) connected or connectable to the contact pin body (3) and the fixed body (2), in, When the contact pin unit (1) is in a fully assembled state, the fixing body (2), the contact pin body (3), the sensor contact body (4) and the internal thread (5) are electrically connected to each other along the main longitudinal center axis (7) in a force-fitting, form-fitting and / or material-bonding manner.

2. The contact pin unit (1) according to claim 1, characterized in that The internal thread (5) is formed in a threaded sleeve (10) manufactured separately from the fixing body (2), and the fixing body (2) has an axial sleeve receiving portion (11) arranged along the main longitudinal center axis (7), and the threaded sleeve (10) is coaxially inserted into the axial sleeve receiving portion (11) when the contact pin unit (1) is fully assembled.

3. The contact pin unit (1) according to claim 2, characterized in that The fixing body (2) is made of a fixing body material, in particular copper, while the threaded sleeve (10) is made of a threaded sleeve material, in particular steel, and the two materials are different from each other.

4. The contact pin unit (1) according to claim 2 or 3, characterized in that A first form-fitting element (14) is arranged on the contact pin body (3) in a torsion-resistant manner, wherein a second form-fitting element (16) is arranged on the threaded sleeve (10) in a torsion-resistant manner, and the first form-fitting element (14) and the second form-fitting element (16) correspond to each other to form a form-fitting connection (18), which prevents the contact pin body (3) and the threaded sleeve (10) from rotating relative to each other around the main longitudinal center axis (7) and from translating relative to each other along the main longitudinal center axis (7) when the contact pin unit (1) is in a fully assembled state.

5. The contact pin unit (1) according to claim 4, characterized in that The first form-fitting element (14) is a form-fitting body receiver (15), and the second form-fitting element (16) is a form-fitting body (17), wherein the form-fitting body receiver (15) and the form-fitting body (17) have a shape that deviates from a right circular cylinder.

6. The contact pin unit (1) according to claim 1, characterized in that The internal thread (5) and the fixing body (2) are formed integrally with each other.

7. Contact pin unit (1) according to any one of the preceding claims, characterized in that In a fully assembled state of the contact pin unit (1), the contact pin body (2) and the fixing body (2) are connected to each other by rotary friction welding (20).

8. The contact pin unit (1) according to any one of claims 1 to 7, characterized in that A first crimping element (21) is fixed to the fixed body (2), wherein a second crimping element (22) is fixed to the contact pin body (3), and the first crimping element (21) and the second crimping element (22) correspond to each other to produce a pressure-fit connection, and the fixed body (2) and the contact pin body (3) are connected to each other along the main longitudinal center axis (7) by the pressure-fit connection when the contact pin unit (1) is fully assembled.

9. Contact pin unit (1) according to any one of the preceding claims, characterized in that The sensor contact body (4) and the contact pin body (3) are formed integrally with each other.

10. The contact pin unit (1) according to any one of claims 1 to 8, characterized in that The sensor contact body (4) and the contact pin body (3) are manufactured separately from each other.

11. Contact pin unit (1) according to claims 8 and 10, characterized in that The sensor contact body (4) is designed as a sensor flat body (25) and is fixed between the contact pin body (3) and the fixing body (2) along the main longitudinal center axis (7) in the fully assembled state of the contact pin unit (1).

12. The contact pin unit (1) according to claim 11, characterized in that The sensor flat body (25) has a fixing through-hole (26), and one of the first crimping element (21) and the second crimping element (22) is designed as a pressing pin (23), which extends through the fixing through-hole (26) when the contact pin unit (1) is in a fully assembled state.

13. Contact pin unit (1) according to any one of the preceding claims, characterized in that The fixing body (2) is made of a material different from that of the contact pin body (3).

14. Contact pin unit (1) according to any one of the preceding claims, characterized in that An electrically conductive contact pin (6) is attached to the contact pin body (3), the electrically conductive contact pin (6) protruding axially from the contact pin body (3) eccentrically with respect to the main longitudinal center axis (7).

15. A plug connection element for an energy transmission connection, wherein: The plug connection element is designed as a charging plug or charging socket of a purely electric or hybrid vehicle and has a contact pin unit (1) according to one of the preceding claims.

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