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Title:
CONTACT PIN WITH A COOLING CHANNEL SYSTEM AND ELECTRICAL PLUG WITH SUCH A CONTACT PIN
Document Type and Number:
WIPO Patent Application WO/2021/048380
Kind Code:
A1
Abstract:
The invention increases the reliability of electrical plug connections through a contact pin (1) for an electrical plug (2), wherein the electrical plug (2) is intermateable with a mating plug along a mating direction (S). The contact pin (1) comprises an electrically conductive contact element (6) and an electrically non-conductive contact protection (8), wherein the contact protection (8) encloses the contact element (6) in sections. In the contact protection (8), at least one cooling channel system (24) is formed for conducting a cooling fluid. The cooling channel system (24) has a cooling fluid supply (26) and a cooling fluid return (28), which is fluidically connected to the cooling fluid supply (26). Further, the cooling channel system (24) extends at least to a distal end (10) of the contact element (6), the distal end (10) facing the mating plug. This establishes an active cooling, which counters electrical heat generation and other causes of heat build up. Subsequently, the active cooling prevents a temperature-affected drop of the current carrying capacity of the plug (2). Furthermore, thermal load on the contact pin (1), on its components and on the plug (2) are reduced by the active cooling.

Inventors:
ECKEL MARKUS (DE)
Application Number:
PCT/EP2020/075511
Publication Date:
March 18, 2021
Filing Date:
September 11, 2020
Export Citation:
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Assignee:
TE CONNECTIVITY GERMANY GMBH (DE)
International Classes:
H01R13/00; B60L53/16; H01R13/04; H01R13/44; H01R24/66
Domestic Patent References:
WO2012051510A22012-04-19
WO2009134379A12009-11-05
Foreign References:
US20160064849A12016-03-03
DE202019102461U12019-05-21
CN110148495A2019-08-20
CN207572574U2018-07-03
EP3379655A12018-09-26
Attorney, Agent or Firm:
GRÜNECKER PATENT-UND RECHTSANWÄLTE PARTG MBB (DE)
Download PDF:
Claims:
Claims

1. Contact pin (1) for an electrical plug (2), the electrical plug (2) being intermateable with a mating plug, wherein the contact pin (1) comprises an electrically conductive contact element (6) and an electrically non-conductive contact protection (8), the contact pro- tection (8) enclosing the contact element (6) in sections, wherein, in the contact pro tection (8), at least one cooling channel system (24) for conducting a cooling fluid is formed, wherein the cooling channel system (24) comprises a cooling fluid supply (26) and cooling fluid return (28) being connected to the cooling fluid supply (26) in a fluid conducting manner and wherein the fluid cooling channel (24) extends at least to a distal end (10) of the contact element (6), the distal end (10) facing the mating plug.

2. Contact pin (1) according to claim 1, wherein the contact element (6) at least partially forms a wall of the cooling channel system (24).

3. Contact pin (1) according to claim 1 or 2, wherein the contact protection (8) carries the contact element (6). 4. Contact pin (1) according to any one of claims 1 to 3, wherein two opposing sides (34) of the contact pin (1) are formed by the contact element (6) and two other opposing sides (36) of the contact pin (1) are formed by the contact protection (8).

5. Contact pin (1) according to any one of claims 1 to 4, wherein a free end (11) of the contact protection (8) overtops the distal end (10) of the contact element (6). 6. Contact pin (1) according to any one of claims 1 to 5, wherein the contact protection

(8) extends along the contact element (6) beyond two ends (10, 12) of the contact element (6).

7. Contact pin (1) according to any one of claims 1 to 6, wherein at least a portion (70) of the cooling channel system (24) is arranged beyond the distal end (10) of the contact element (6).

8. Contact pin (1) according to any one of claims 1 to 7, wherein the contact element (6) comprises at least two opposing sections (14a, 14b), between which the cooling chan nel system (24) is arranged.

9. Contact pin (1) according to any one of claims 1 to 8, wherein, at a proximal end (12) being opposite the distal end (10) of the contact element (6), ports (48) for each of the cooling fluid supply (26) and cooling fluid return (28) are located.

10. Contact pin (1) according to any one of claims 1 to 9, wherein the cooling channel system (24) extends at least over the entire length of the contact element (6).

11. Contact pin (1) according to any one of claims 1 to 10, wherein the cooling channel system (24) comprises a U-shaped pathway.

12. Contact pin (1) according to any one of claims 1 to 11 , wherein a partition wall (60) runs in the cooling channel system (24). 13. Contact pin (1) according to any one of claims 1 to 12, wherein at least one temperature sensor (74), which is connected to an outer surface (22) of the contact element (6) in a heat-conducting manner, is provided in the contact protection (8).

14. Contact pin (1) according to any one of claims 1 to 13, wherein the contact protection (8) forms a touch protection (72) that covers the distal end (10) of the contact element (6).

15. Electrical plug (2) comprising at least one contact pin (1) according to any one of claims

1 to 14 and a pin strip (78), in which the at least one contact pin (1) is fixed, wherein the pin strip (78) comprises a finger protection wall (100), so that together with the contact protection (8) of the contact pin (1) a touch protection (72) for the contact ele- ment (6) arises as a result.

Description:
Contact Pin with a Cooling Channel System and Electrical Plug with such a Contact

Pin

The present invention relates to electrical plugs, particularly high-voltage plugs, for use in au tomotive technology applications having voltages in the range of 1000 V to 1500 V for example, and contact pins for such electrical plugs.

In automotive technology, transmission of electrical current through detachable plug connec tions is necessary for a plurality of applications. For example, motor vehicles with an electric drive and built-in accumulator are connected to an electric charging column for the duration of the charging process. In order to reduce the charging time, high electric currents and/or volt ages are used in the charging system. In particular, the electrical security and the current car rying capacity of the current carrying components of the charging system represent limiting factors.

The electrical security is to be ensured in accordance with the applicable provisions, such as of statutory, legal, contractual, normative and/or technical kind. The current carrying capacity is among others dependent on the choice of materials of the current carrying components and on the surrounding conditions of the charging system. Furthermore, the current carrying ca pacity in common charging systems decreases with increasing operating time. A low current carrying capacity results in longer charging times and may, in some circumstances, also lead to restricted functionality of the plug connections and the entire charging system, respectively.

The present invention addresses the problem of generally improving the capacity and the op erational reliability of an electrical plug connection.

This problem is solved by a contact pin for an electrical plug, the electrical plug being inter- mateable with a mating plug, wherein the contact pin comprises an electrically conductive con tact element and an electrically non-conductive contact protection, which surrounds the contact element in sections and wherein, in the contact protection, at least one cooling channel system for conducting a cooling fluid is formed. The cooling channel system comprises a cooling fluid supply and a cooling fluid return, which is connected to the cooling fluid supply in a fluid con ducting manner. Moreover, the cooling channel system extends at least to a distal end of the contact element, the distal end facing the mating plug. The distal end may particularly be turned away from the cooling fluid supply and/or return. The advantages achieved with the present invention are in particular that a possibility is formed for actively cooling the current conducting contact element by means of the cooling fluid. Said active cooling comprises an improved cooling effect in comparison to cooling by natural con vection. Hence, the active cooling acts particularly strongly against both inner electrical heating and any outer heating causes. Outer heating causes may be for example thermal radiation of surrounding components and/or an externally heated airflow flowing passed the contact ele ment. The active cooling thus prevents a temperature related drop of the current carrying ca pacity of the electrical plug. Moreover, the active cooling reduces the thermal strain on the contact pin and its components and on the electrical plug, respectively. In this way the active cooling protects the electrical plug connection from inner and/or outer influences and thus im proves both the capacity and the operational reliability of the electrical plug connection.

The invention can be further improved by the following embodiments, which are each on their own advantageous and can be combined arbitrarily.

According to one embodiment of the invention, the contact element may at least in sections form a wall of the cooling channel system. In particular, the contact element may form a wall of the cooling fluid supply and/or return, wherein a sufficient imperviousness of the cooling channel system is ensured, for example, by an overmoulding or adherence of the contact ele ment with the contact protection. Hence, the contact element may be wetted, at least in sec tions, by the cooling fluid. A direct wetting of the contact element enables an immediate heat transfer from the contact element into the cooling fluid. As a result, the cooling effect of the active cooling is further improved.

Preferably, the cooling channel system in this embodiment may be designed for the use of an electrically non-conducting cooling fluid, such as a non-conducting liquid, a dielectric liquid and/or a non-conducting gas. This is insofar advantageous, as unwanted corrosion phenom ena on the contact element, which would be caused by creeping currents in electrically con ducting fluids, may be prevented.

In an alternative embodiment, the cooling channel system may solely be formed by the contact protection and may be designed for the use of an electrically conducting liquid, such as a water glycol mixture. The contact element will not be directly wetted at any place in this alternative embodiment. This increases the range of deployable cooling fluids, as it allows the application of cooling fluids, which, due to their electric conductivity and/or corrosion promoting effect, may not come into direct contact with the contact element. Hence, by way of example, cooling fluids with high specific heat capacities may be used without restriction. In addition, cooling fluids may be used, which generally exhibit a high availability and/or environmental compatibility. The result is a cost and effort reduction for the acquisition, transport, storage and/or disposal of the respective cooling fluid.

In a further embodiment of the contact pin, the contact protection may carry the contact ele ment. Particularly, the contact element may be held by the contact protection in that the contact protection surrounds and contacts the contact element from multiple sides. Preferably, the contact element is completely restricted in all degrees of freedom of its movement abilities by the contact with the contact protection. For this, the contact protection for example may be a plastic moulded onto the contact element by means of an In-Mould-Process.

With this embodiment, the contact element is fixed via the contact protection, so that a loss of the contact element by moving and slipping of the contact element during plugging together with the mating plug is prevented.

According to a further embodiment, at least in a cross section of the contact pin perpendicular to the plugging direction two opposing sides, preferably two opposing flat sides, of the contact pin are formed by the contact element and two other opposing sides of the contact pin are formed by the contact protection. Additionally, neighbouring sides of the contact pin may be connected via edges, respectively. Particularly, the two adjacent sides may comprise surfaces, which are arranged perpendicularly to one another. This means that at least a first surface spanning vector of the respective surfaces extends parallel to the plugging direction, while a second surface spanning vector extends perpendicular to the plugging direction. In this em bodiment, the contact element comprises at least two exposed contact surfaces, which in re gard to their orientation do not hinder insertion of the electrical plug into the mating plug along the plugging direction.

In a further embodiment, a free end of the contact protection may overtop the distal end of the contact element in the plugging direction. Thus, the contact protection may prevent an un wanted shift of the contact element in the plugging direction.

Additionally, a further free end of the contact protection may overtop a proximal end of the contact element being opposite the distal end, so that the contact protection extends along the contact element beyond both of its ends. Hence, the contact protection may prevent any shift of the contact element along the plugging direction. According to a further embodiment, at least a portion of the cooling channel system may be arranged beyond the distal end and/or proximal end of the contact element, preferably in the contact protection. Hence, sections of the contact pin, which do not form the contact element, but are subjected to external heating causes, may be actively cooled.

In a further embodiment, the contact element may comprise two opposing sections, between which the cooling channel system is arranged. Particularly, the contact element surrounds the cooling channel system from at least three sides. For this, the contact element may be formed as a hollow profile with, for example, a U-shaped, semicircle shaped or partcircle shaped cross- section perpendicular to the plugging direction. Preferably, the contact element surrounds the cooling channel system all round. Correspondingly, the contact element may be formed as a hollow profile, for instance, with a round, rectangular or square cross-section perpendicular to the plugging direction. The shaping of the hollow profile may also change along the plugging direction with continuous and/or stepwise transitions.

The contact element may preferably be manufactured from an electrically conductive material, such as comprising copper, aluminium, silver, gold, platinum or other metals. Particularly, the contact element may be configured to be an extruded profile, a stamped and bent part or as a deep drawn part having a hollow chamber that surrounds the cooling system. Thus, in this embodiment, mechanical characteristics of the metallic material may be exploited, in order to strengthen the mechanical stability of the cooling channel system.

According to a further embodiment ports for each of the cooling fluid supply and return may be located at the proximal end of the contact element. Particulalry, a T-piece may be provided, which forms the ports and is located at the proximal end of the contact element. The T-piece may be an integral component of the contact protection or in the form of a separate component be put on the contact protection and rest on a sealing ring. Therefore, the cooling channel system may connect at least one cooling fluid supply line with at least one cooling fluid return line in a fluid conducting manner. The cooling fluid supply line serves the transport of the cool ing fluid towards the cooling channel system and the cooling fluid return line serves the transport of the cooling fluid away from the cooling channel system. The assembly of the ports in this embodiment are of advantage, as they enable a space-saving construction of the con tact pin.

Additionally, an opening in the T-piece may connect the cooling fluid supply with the cooling fluid return and form an internal bypass, through which a predetermined portion of the cooling fluid may flow passed the cooling channel system. The splitting ratio at the bypass may be defined by the non-varying geometry of the opening or be adjustable by a valve and flap, re spectively. The bypass allows it to adjust the flow rate in the cooling channel system for each application or each operating mode.

Moreover, the bypass allows an effective use of a common cooling fluid line for multiple cooling channel systems of multiple contact pins arranged in series, in that the bypass divides the total flow rate and thus prevents that each cooling channel system has to be flowed through. Thus, this leads to savings in operating expenses, as a lower pressure drop results.

Additionally or alternatively to the already mentioned features the cooling channel system may extend in plugging direction, prefereably at least over the entire length of the contact element. Particularly, at least one straight cooling channel of the cooling channel system may be formed along the plugging direction as a recess, cavity and hollow space, respectively, in the contact protection and/or contact element. The straight cooling channel may lead from the T-piece at least to the distal end of the contact element. In this case, the straight cooling channel may comprise a cross section perpendicular to the plugging direction, which is preferably geomet rically similar to the cross section of the contact element.

With this embodiment, an active cooling of all contact transmission points may be achieved. The contact transmission points are characterised in that at these points, in a completely plugged together state, the contact element of the electrical plug is in electrical contact with the contact element of the electrical plug with a complementary contact element of the mating plug. Generally, contact transmission points constitue critical areas, in which it comes to a tapering of the cross section available for the electric current. The electrical heating is thus particularly high at the contact transmission points in comparison to the remainder of the plug. A specific active cooling of the contact transmission points according to the present invention is thus advantageous and particularly effective.

In a further embodiment, the cooling channel system may comprise a U-shaped pathway. Cor respondingly, at least one channel section is formed in the cooling channel system that is connected with the port of the at least one cooling fluid supply line in a fluid conducting manner and extends in plugging direction, preferably along the entire length of the contact element. A curved channel section of the cooling channel system forms a change in direction. A second channel section of the cooling channel system is formed parallel to the first channel section and leads to the port of the at least one cooling fluid return line. The first channel section is connected to the second channel section via the curved channel section in a fluid conducting manner. The U-shaped pathway of the cooling system allows active cooling of the entire length of the contact element and simultaneously arranging the ports of the cooling fluid supply and return line in immediate proximity to one another. This results in a particularly compact con struction of the contact pin.

Optionally, at least one partition wall may run through the cooling channel system in a further embodiment. The partition wall for instance may consist of a separate partition wall element, which is inserted into the cooling channel system. Alternatively, the partition wall may be formed as part of the T-piece, protrude from the proximal end of the contact element in the plugging direction into the cooling channel system and divide the straight cooling channel into the first and second channel section. The use of a partition wall enables providing the cooling channel system with a U-shaped pathway, without using components with undercuts.

In a further embodiment, at least one temperature sensor, such as from the group including PT100-temperature sensors, PT1000-temperature sensors, linear temperature sensors, non linear temperature sensors and thermoelements, may be provided in the contact protection. Particularly, the at least one temperature sensor may be held at a position, in which the at least one temperature sensor is connected with an outer surface facing away from the cooling chan nel system of the contact element in a heat conducting manner. Preferably, the position of the at least one temperature sensor is located at an equal up to approximately equal height with the at least one contact transmission point in relation to the plugging direction. In this case, the temperature sensor and the contact transmission point may be located at the same side of the contact pin or be arranged at adjacent sides of the contact pin.

The application of temperature sensors enables monitoring of the prevalent temperatures, which for instance, may be utilised for a temperature control. The positioning of the tempera ture sensor at the outer surface of the contact element, which outer surface faces away from the cooling channel system, prevents an undererstimation of the actual temperature values. Furthermore, the temperature sensor may in this embodiment measure the temperature as close as possible to the contact transmission points, which are also located at the outer surface facing away from the cooling channel system of the contact element.

Preferably, at least two temperature sensors being arranged opposite one another with regard to the contact element, may be provided in the contact protection and each being connected with an outer surface facing away from the cooling channel system of the contact element in a heat conducting manner. The application of at least two temperature sensors allows fora plau sibility check of the temperature measurement data and delivers a redundant temperature measurement system. According to a further embodiment, the contact protection may form a touch-protection, pref erably a finger protection, which covers in the plugging direction the distal end of the contact element. Hence, the contact protection protects the distal end of the contact element, at least in the plugging direction, from inadvertent mechanical impacts and/or inadvertent human touch.

The underlying problem at the outset may further be solved by an electrical plug, which com prises at least one inventive contact pin and a pin strip made of plastic, for example. The inventive electrical plug is of advantage, since by means of the active cooling of the at least one contact pin, unwanted and capacity restricting thermal influences from the inside and the outside may be counteracted.

In particular, the at least one contact pin may be fixed in the pin strip in such a way that it is oriented along the plugging direction. For this, the pin strip comprises at least one receptacle, in which the at least one contact pin is inserted as well as pressed, latched and/or adhered. Further, the pin strip comprises a finger protection wall, so that in combination with the contact protection of the at least one contact pin a touch-protection, preferably a finger protection, for the contact element of the at least one contact pin arises as a result. By the touch-protection the contact element is protected multilaterally from inadvertent mechanical impacts and human touch.

According to an advantageous embodiment, the electrical plug may be intermateable with the mating plug along the plugging direction. Further, the contact pin may compise a longitudinal dilatation. Correspondingly, the contact element may comprise a longitudinal shape and ex tend along a longitudinal axis. In particular, the contact element may comprise a distal end facing the mating plug and a proximal end located opposite the distal end. Preferably, the distal end and the proximal end may be aligned along the plugging direction. At the proximal end, the contact element may be rigidly attached to a busbar for example via welding and/or soldering, which leads to an electric aggregate, a relay or a battery. A rigid joint to the busbar is advantageous due to its time, cost and material saving producibility.

Alternatively, the contact element may be detachably joined to the busbar via a screw joint at the proximal end. For this, at the proximal end of the contact element an assembly, such as a screwing point with a threaded bore or an external thread, for the removable joint may be provided. The removable joint lowers the effort during maintenance and repair works of the electrical plug. At the distal end, at least one outer surface of the contact element may enter into an electric connection with an inner surface of a complementary contact element of the mating plug. In this instance, the finger protection wall and the touch protection surround the distal end of the contact element in such a way that only a slot arises, in which the complementary contact element of the mating plug may be inserted but in which a finger probe, such as a VDE joint finger probe, does not fit.

The advantage of this embodiment lies in the fact that it offers a touch protection, preferably a finger protection, for at least one outer surface of the contact element and simultaneously al lows for an electrically conducting plug connection with the mating plug. Further, the active cooling of the contact pin, due to the thermal conduction, has an effect up to the busbar and any immediately preceding and following electrical components.

In a further alternative embodiment, an inner surface of the contact element may, at the distal end of the contact element, enter into an electric connection with at least one outer surface of a complementary contact element of the mating plug. In this embodiment, the pin strip may additionally or alternatively to the finger protection wall, comprise a finger protection stud. The finger protection stud is formed along the plugging direction and protrudes through the contact pin. In this instance, the finger protection stud is surrounded by the contact pin in such a man ner that only a self-contained slot is formed, in which the complementary contact element of the mating plug may be inserted, but in which a finger probe, such as a VDE joint finger probe, does not fit.

This embodiment is advantageous, since it offers for at least one inner surface of the contact element a touch protection, preferably a finger protection, while allowing an electrically con ducting plug connection with the mating plug.

Hereinafter, with reference to the attached drawings the invention is explained in greater detail using multiple exemplary embodiments, whose different features can be combined arbitrarily in accordance with the above remarks.

In the drawings:

Fig. 1 shows a schematic sectional view of an inventive contact pin according to a first em bodiment;

Fig. 2 shows a schematic sectional view of an inventive contact pin according to a further embodiment; Fig. 3 shows an enlarged partial view of the sectional view from Fig. 2;

Fig. 4 shows a further enlarged partial view of the sectional view from Fig. 2;

Fig. 5 shows a schematic perspective view of an inventive electrical plug according to a first embodiment;

Fig. 6 shows a further perspective view of the electrical plug from Fig. 5;

Fig. 7 shows a schematic sectional view of an inventive electrical plug according to the first embodiment;

Fig. 8 shows an enlarged partial view of a further sectional view of an inventive electrical plug according to the first embodiment;

Fig. 9 shows an enlarged partial view of a further sectional view of an inventive electrical plug according to the first embodiment; and

Fig. 10 shows a schematic perspective view of an inventive electrical plug according to a sec ond embodiment.

First, the schematic structure of the inventive contact pin 1 is depicted with reference to Figs. 1 to 4, 8 and 9. Subsequently, the schematic structure of an inventive electrical plug is de scribed with reference to Figs. 5 to 7 and 10.

The inventive contact pin 1 for an electrical plug 2, the electrical plug 2 being intermaterable in a plugging direction S with a mating plug (not shown), may comprise, in a possible embodi ment, an electrically conducting contact element 6 and an electrically non-conducting contact protection 8.

The contact element 6 may comprise a longitudinal shape and extend along the plugging di rection S. Particularly the contact element 6 may comprise a distal end 10 and a proximal end 12. The distal end 10 may in the plugging direction S face towards the mating plug. The prox imal end 12 may be located opposite the distal end 10 and face away from the mating plug. Further, the contact element 6 may comprise two opposing sections 14a, 14b. In Figs. 1 to 4 the contact element 6 is depicted as a hollow profile 16 with a rectangular cross section and a hollow chamber 18. The contact element 6 may generally be formed of any electrically con- ducting material, such as copper, aluminium, silver, gold, platinum or other metals, and alter natively comprise a U-shaped, semicircle-shaped, partcircle-shaped, round or square cross section. The shaping of the hollow profile 16 may also vary along the plugging direction S with continuous and/or stepwise transitions.

The contact protection 8 may sectionally surround the contact element 6 and abut at least one inner surface 20 and/or outer surface 22 of the contact element 6. Preferably, the contact pro tection 8 abuts multiple inner surfaces 20 and/or outer surfaces 22 of the contact element 6 such that the contact element 6 is completely restricted in all degrees of freedom of its move ment possibilities. Notably, the contact element 6 is carried or held by the contact protection 8. For this, the contact protection 8 may by way of example be a plastic moulded onto the contact element 6 by means of an In-Mould-Process.

Additionally, in the contact protection 8 at least one cooling channel system 24 for conducting a cooling fluid may be formed. The cooling channel system 24 comprises a cooling fluid supply 26 and a cooling fluid return 28. The cooling fluid supply 26 may be connected to the cooling fluid return 28 in a fluid conducting manner via a straight cooling channel 30. The cooling channel 30 may particularly be formed in the contact protection along the plugging direction S as a recess, cavity and hollow space 32, respectively.

In the shown embodiments of Figs. 1 to 4, the entire cooling channel system 24 is formed by the contact protection 8, so that the contact element 6 may at no point be wetted directly from the cooling fluid. In an alternative embodiment, not shown, the contact element 6 may at least partially form a wall of the cooling channel system 24, for example via corresponding slots, openings and/or recesses in the contact protection 8 or via partial or complete omission of the contact protection 8 within the hollow chamber 18 of the contact element 6. In this case, a sufficient leakproofness of the cooling channel system 24 is to be ensured, for example via overmoulding or adhering of the contact element 6 with the contact protection 8.

As is depicted in Figs. 8 and 9, the cooling channel 30 may comprise a cross section perpen dicular to the plugging direction S, which preferably is geometrically similar to the cross section of the contact element 6. For example, in case of a rectangular profile of the contact element 6, the cooling channel 30 correspondingly comprises a rectangular cross section. The contact protection 8 and the contact element 6 may in this case be arranged in such a manner that in at least one cross section perpendicular to the plugging direction S of the contact pin 1 two opposing flat sides 34 of the contact pin 1 are formed by the contact element 6 and two other opposing sides 36 of the contact pin 1 are formed by the contact protection 8. Adjacent sides 38a, 38b of the contact pin 1 may each be joined to one another via edges 40. Particularly, the adjacent sides 38a, 38b may in this case comprise surfaces 42a, 42b, which are oriented per pendicular to one another. This means that at least one first surface spanning vector 44 of the respective surface 42a, 42b runs parallel to the plugging direction S, while a second surface spanning vector 46 runs perpendicular to the plugging direction S.

At the proximal end 12 of the contact element 6, ports 48 for each the cooling fluid supply 26 and the cooling fluid return 28 may be located. Preferably, at least one cooling fluid supply line (not shown) may be connected to the cooling fluid supply 26 and at least one cooling fluid return line (not shown) to the cooling fluid return 28. The cooling fluid supply line serves the transport of cooling fluid towards the cooling channel system 24 and the cooling fluid return line serves the transport of the cooling fluid away from the cooling channel system 24. For this, the contact pin 1 may particularly comprise a T-piece 50. The T-piece 50 is arranged at the proximal end 12 of the contact element 6 and forms the corresponding ports 48. The T-piece 50 may, in the form of a separate component 52, be put over the contact pin 1 via the contact protection 8 and rest on a sealing ring 54.

By a round opening 56 an internal bypass 58 may be formed in the T-piece 50. The round opening 56 may connect the cooling fluid supply 26 with the cooling fluid return 28, so that a predefined portion of the cooling fluid may flow passed the cooling channel system 24, without flowing through the cooling channel system 24.

Moreover, a partition wall 60 may run through the cooling channel system 24. The partition wall 60 may be formed as part of the T-piece 50, protrude from the proximal end 12 of the contact element 6 in the plugging direction S into the cooling channel system 24, be held by longitudinal slots 62 of the contact protection 8 and divide the straight cooling channel 30 into a first channel section 64 and a second channel section 66. The first channel section 64 may be connected in a fluid conducting manner via a curved channel section 68 with the second channel section 66. Particularly, the first channel section 64, the curved channel section 68 and the second channel section 66 may result in a U-shaped pathway of the cooling channel system 24. This means the first channel section 64 may be connected to the port 48 of the cooling fluid supply 26 and extend in the plugging direction S. The curved channel section 38 may form a change in direction. The second channel section 66 may be formed parallel to the first channel section 64 and lead to the port 48 of the cooling fluid return 28. In an alternative embodiment not shown, the T-piece 50 and/or the partition wall 60 may be manufactured as integral components of the contact protection 8 by means of 3D-printing or other generative manufacturing processes.

As is shown in Figs. 1 and 2, the cooling channel system 24 may extend along the plugging direction S at least over the entire length of the contact element 6. Preferably, at least one part 70 of the cooling channel system 24 may be located in the contact protection 8 beyond the distal end 10 of the contact element 6. For this, by means of an example a free end 11 of the contact protection 8 may overtop the distal end 10 of the contact element 6 in plugging direction S. The overtopping part 70 of the contact protection 8 may form a touch protection 72, which in plugging direction S covers the distal end 10 of the contact element 6.

Additionally, the contact protection 8 may also overtop the proximal end 12 of the contact ele ment 6, so that the contact protection 8 along the contact element 6 extends beyond its ends 10, 12.

Optionally, the contact pin 1 may comprise at least one temperature sensor 74, preferably at least two temperature sensors 74. Each temperature sensor 74 may be held by the contact protection 8 in a position, in which the respective temperature sensor 74 is connected with an outer surface 22 of the contact element 6 facing away from the cooling channel system 24 in a heat-conducting manner. Preferably, the position of the respective temperature sensor 74 with respect to the plugging direction S is located at the same up to approximately the same height with at least one contact transmission point 76 and/or a further temperature sensor 74. As temperature sensors PT100-temperature sensors, PT1000-temperature sensors, linear temperature sensors, non-linear temperature sensors and/or thermoelements may be used.

In Figs. 5 to 7, a possible embodiment of an inventive electrical plug 2 is depicted. The electri cal plug 2 may be intermateable with a mating plug (not shown) along a plugging direction S and comprises at least one, preferably two, inventive contact pins 1 as well as a pin strip 78. The pin strip 78 may comprise a rectangular base plate 80, which comprises a receptacle 82 for each contact pin 1. The respective receptacle 82 may be formed as a rectangular opening 84, in which the corresponding contact pin 1 is inserted and latched. For the latching engage ment, the contact protection 8 of the respective contact pin 1 may comprise at least one ex tension 86 in the form of a latching nose 88. The at least one extension 86 may be formed in such a manner that the side of the latching nose 88 rests on the base plate 80. Alternatively, the contact pin 1 may be pressed or adhered. The rectangular opening 84 of the receptacle 82 runs preferably perpendicular to the base plate 80 and in plugging direction S. Therefore, the respective contact pin 1 is oriented in the pin strip 78 along the plugging direction S and protrudes on both sides 92a, 92b from the base plate 80.

The distal end 10 of the contact element 6 of the respective contact pin 1 may be arranged particularly on a side 90 of the base plate 80 facing the mating plug. On the opposite side of the base plate 80 facing away from the mating plug, the proximal end 12 of the contact element 6 of the respective contact pin 1 may be arranged.

At the respective proximal end 12, a screwing position 94 with a threaded bore 96 for a remov able connection with a busbar is provided. Alternatively, a rigid connection, for instance by means of welding and/or soldering, with the busbar 98 may be formed.

Further, the T-piece 50 with corresponding ports 48 for at least one cooling fluid supply line and at least one cooling fluid return line may be located at the respective proximal end 12.

At the respective distal end 10 at least one outer surface 22 of the respective contact element 6 may enter into an electrical connection with at least one inner surface of a complementary contact element of the respective mating plug.

The pin strip 78 further comprises a finger protection wall 100, which protrudes perpendicular from the base plate 80 and surrounds the respective contact pin 1 from at least three sides, of which two are flat sides 34 formed by the contact element 6. In particular, the finger protection wall 100 may surround the distal end 10, together with the contact protection 8, in such a manner that only a slot 104 arises, in which the complementary contact element of the mating plug may be inserted, but in which a finger probe (not shown) such as a VDE-joint finger probe does not fit. This means the distance between finger protection wall 100 and contact protection 8 is at every outer edge 106 of the contact protection 8 at least larger than the width of the complementary contact element of the mating plug and at least smaller than the diameter of the finger probe.

In Fig. 10, an alternative embodiment of the inventive electrical plug 2’ is depicted. In this embodiment, the electrical plug 2’ comprises an inventive contact pin T with a round profile. Correspondigly, the contact element 6’ and the contact protection 8 also comprise a round profile. At a distal end 10’ of the contact element 6’ facing the mating plug, at least one inner surface 20’ of the contact element 6’ may enter into an electrical connection with at least one outer surface of a complementary contact element of the mating plug. In this embodiment, the pin strip 78’ may comprise additionally or alternatively to a finger protection wall 100’ that sur rounds the distal end 10’ at least in sections, a finger protection stud 110’. The finger protection stud 110’ is formed along the plugging direction S and protrudes through the contact pin T. In this instance, the finger protection stud 110’ is surrounded by the contact pin T in such a manner that only a self-contained slot 104’ arises, in which the complementary contact element of the mating contact may be inserted, but in which a finger probe (not shown), such as a VDE- joint finger probe, does not fit.

Reference numerals

1 , r contact pin

2 2 electrical plug

6 6 contact element

8 8 contact protection

10 10 distal end

11 free end

12 proximal end

14a, 14b section

16 hollow profile

18 hollow chamber

20 20 inner surface

22 outer surface

24 cooling channel system

26 cooling fluid supply

28 cooling fluid return

30 straight cooling channel

32 recess, cavity, hollow space

34 flat side

36 sides

38a, 38b sides 40 edges

42a, 42b surfaces 44 first surface spanning vector 46 second surface spanning vector 48 ports 50 T-piece 52 separate component 54 sealing ring 56 round opening 58 internal bypass 60 partition wall 62 longitudinal slot 64 first channel section 66 second channel section 68 curved channel section 70 portion of the cooling channel system

72 touch protection

74 temperature sensor

76 contact transmission point 78, 78‘ pin strip

80 base plate

82 receptacle

84 rectangular opening

86 extension 88 latching nose 90 Side

92a, 92b Sides of the base plate

94 Anschraubstelle

96 threaded bore 98 busbar

100, 100‘ finger protection wall 104, 104‘ slot 106 outer edge 110‘ finger protection stud