CH706105A1 - Corrosion-resistant connection. - Google Patents

Abstract

A device comprising first and second electrical conductors (3, 6), said first and second electrical conductors (3, 6) being formed of metals or metal alloys having different standard potentials, and an electrical connection between said first and second electrical conductors Ladder (1, 2). An insulating jacket surrounds at least one of the electrical conductors (3, 6). Between the insulating jacket and at least one of the electrical conductors, a hydrophobic layer is arranged, so that the electrical connection is corrosion resistant. The electrical connection is formed by a direct contact. The first electrical conductor and the insulating jacket form an insulated cable, wherein the electrical conductor protrudes from the jacket and thus forms an insulating layer-free area.

Description

Technical area

The invention relates to a device comprising a first and a second electrical conductor, wherein the first and the second electrical conductor of metals and / or metal alloys are formed with different standard potentials, an electrical connection between the first and the second electrical conductor, and an insulating jacket surrounding at least one of the electrical conductors.

State of the art

Electrical lines have in their interior an electrical conductor made of a conductive material. In most cases, these are wires or strands of copper or aluminum. These are covered by an insulating layer.

It is not a problem if the lines comprise electrical conductors of only one conductive material. In contrast, a transition between two conductive materials is susceptible to external influences. He can z. B. often attacked by moisture or destroyed completely.

In US 2002/0 096 352 waterproof cable connections are disclosed. However, the tightness of this cable connection is based solely on the positive connection of the connection, which is not always sufficient. Over time, moisture can enter such a connection.

US 2001/00 164 559 describes the possibility of connecting a cable with the aid of the electromagnetic pulse technology with a cable lug. However, this compound is not protected against moisture.

Presentation of the invention

The object of the invention is to provide a device belonging to the aforementioned technical field, which is robust against external conditions.

The solution of the problem is defined by the features of claim 1. According to the invention, a device is provided which comprises a first and a second electrical conductor, wherein the first and the second electrical conductor are formed from metals or metal alloys with different standard potentials. The first and second electrical conductors have an electrical connection. At least one of the two electrical conductors is surrounded by an insulating jacket. Between the insulating jacket and at least one of the electrical conductors, a hydrophobic layer is arranged, so that the electrical connection is corrosion resistant.

A corrosion resistant connection of two electrical conductors allows a versatile use of the line thus formed. The pipe can be used regardless of the prevailing conditions in the environment. In particular, the line can be used regardless of whether moisture or moisture is present in the environment. Thus, a device according to the invention is suitable for use in outdoor areas. But it is also suitable for use in the automotive sector, mechanical engineering, plant construction, systems in the field of new energies, such. B. in wind turbines, especially in offshore installations, where in addition to the occurring moisture and temperature differences may be added.

Corrosion is generally understood to mean a reaction of a material or a combination of materials with the environment, which leads to a change of at least one material, whereby the function of an element made of the material or the materials can be reduced. Corrosion often removes a material. In some operations, however, the corrosion product is deposited on the surface of the material. Often, corrosion is a process of metals, but it can also be other materials.

When metals or metal alloys with different standard potentials are in contact with each other, corrosion (contact corrosion) may occur. The nobler metal (with the higher standard potential) then favors the corrosion of the less noble metal (with the lower standard potential). Due to the potential difference, two poles form, the less noble metal becomes the anode and the nobler metal becomes the cathode. If both metals are in contact with an electrolyte, a weak current flows. From the less precious metal electrons flow into the nobler metal (to the cathode), at the same time metal cations are released to the electrolyte solution. The nobler metal, the electrons are released to the electrolyte and reduce there z. As the hydrogen, which is present in the water molecules, to elemental hydrogen.

Water, especially salt water accelerate this process. But even humidity can promote corrosion.

A first and a second electrical conductor consist of a conductive material, preferably of a metal or of a metal alloy. As electrical conductors can single wires, strands or rigid bodies such as thin rods, tubes, sleeves, plates, etc. act. The two electrical conductors must neither consist of the same material nor be shaped the same way. So z. For example, an electrical conductor of several strands may also be connected to a rigid second electrical conductor, e.g. with a plug or with a transition piece to which then a plug can be attached. But it is also possible to connect two elongated cable-like electrical conductors together. Cable-like conductors can be designed as a round cable with a sheathed wire. But it can also be flat cable with multiple, mutually insulated wires. Plugs for such flat cables can be designed such that they merge the individual wires or connect with individual, mutually insulated conductors. A flat cable with multiple wires can also be connected to several plugs.

By an electrical connection is meant a region in which there is a contact point between the first and the second electrical conductor, through which an electric current can flow. In principle, electrical connections can be made detachable or non-detachable. In this case, it is an indissoluble, permanent connection. Permanent connections are usually realized by welding, cold press welding, gluing, pressing, squeezing, riveting or splicing. The connection can be realized by means of a suitable tool, such. B. with a crimping tool. But it is also possible to make the connection without contact without tools, z. B. by means of the electromagnetic pulse method.

At least one of the two electrical conductors is enveloped by an insulating jacket. The insulating jacket is designed according to the influences against which it is intended to protect. It can be single-layered or multi-layered. The outermost layer or alternatively the intermediate layers consist for example of PVC, polyurethane, polyethylene or thermoplastic elastomers, silicone rubber or rubber.

A hydrophobic layer forms a water-repellent surface. This is characterized by the fact that their contact angle with respect to water is large, usually> 90 °. The greater the contact angle, the greater the tendency of the water to be spherical. The interaction with one's own molecules within a drop is more attractive than the lesser interaction with the hydrophobic surface, so that the surface is relatively little covered or wetted. The water is difficult to disperse on a hydrophobic surface, so that the hydrophobic surface forms a water barrier. The layer thickness of the hydrophobic layer is for example about 10-100 micrometers.

Preferably, the electrical connection between the first and the second electrical conductor is formed by a direct contact. The two electrical conductors thus have one or more contact surfaces.

Alternatively, it would also be possible to provide an intermediate element between the first and the second electrical conductor, so that the two electrical conductors are not in direct contact with each other. However, the application of an intermediate layer is an additional step in the production of the device. In addition, each transition from one material to another is a contact surface that can be particularly easily attacked. Therefore, it is advantageous if an intermediate element is dispensed with.

The area of direct contact must be particularly protected against moisture or moisture.

In a preferred embodiment, the first electrical conductor has an insulating jacket over almost its entire length. Only in the region of the contact with the second electrical conductor is there no insulating layer, ie the first electrical conductor protrudes from the insulating jacket. In this case, not only the end face of the first electrical conductor but also a short, non-insulated area of the lateral surface of the electrical conductor, which adjoins the front side, applies as the area of the contact to the second electrical conductor. In this area, the insulating layer was removed. The free end face and the free lateral surface of the first electrical conductor together form an insulation layer-free area.

Preferably, the first electrical conductor is a thin long object having a round cross-section. Optionally, the cross section may also be modified, for. B. square or oval. The electrical conductor may consist of a single wire. But it can also be multiple stranded wires, strands or other act. As an alternative to the round cable, the first electrical conductor may be formed as a flat cable.

Preferably, the first electrical conductor is designed to be flexible, so that it can be used at different and sometimes difficult to reach places. He can then be moved if necessary. A flexible electrical conductor is preferably in the form of a strand, but it can also be in the form of a rope.

But it is also possible that the first electrical conductor is relatively rigid. It is then particularly suitable for fixed installations.

Preferably, the second electrical conductor at the end, via which it is connected to the first electrical conductor, first a sleeve. The sleeve has substantially an entrance area to a cylindrical cavity. On the side facing away from the entrance area, it can open into a thin, long object, which has a similar design to the first electrical conductor. But it can also have a possibility for attaching a plug or already include a plug itself. The sleeve of the second electrical conductor is pushed over the insulating layer-free region of the first electrical conductor, so that in an interior of the sleeve, the electrical connection is formed.

The sleeve has z. B. a circular cross section. But it can also have a different cross section, z. B. an oval, square or any cross-section.

If one of the two electrical conductors is a cable to be connected to a plug, the use of a sleeve is advantageous, since the region of the connection is flexible, since no larger area of the conductor is stiffened. In contrast, z. B. a shrink tube used, the area where it rests, relatively rigid. The inventive compound thus facilitates the use of an electrical conductor in places with little space.

Preferably, the insulating layer-free region of the first electrical conductor and the sleeve of the second electrical conductor are dimensioned such that an overlap region is formed when the first electrical conductor is pushed into the sleeve. This means that the depth of the sleeve is greater than the length of the non-insulated portion of the first electrical conductor. In the overlapping area, there is a direct contact between the insulating layer of the first electrical conductor and the front area of the inside of the sleeve. Preferably, the inside of the sleeve is firmly on the insulating layer. The overlap area is z. B. 2-30 mm long, preferably about 5-15 mm long.

Particularly preferably, a hydrophobic layer is provided in the overlap region between the inside of the sleeve and the insulating jacket of the first electrical conductor. Its layer thickness is preferably about 10-100 microns.

The first and the second electrical conductors are formed of metals and / or metal alloys with different standard potentials. In this case, the first electrical conductor preferably consists of a metal and / or metal alloys with a lower standard potential and the second electrical conductor and / or provided at its end sleeve of a metal and / or metal alloys with a higher standard potential. The first electrical conductor emits electrons more easily than the second. The first electrical conductor is formed of a comparatively less noble material, while the second electrical conductor consists of a nobler material.

But it is also possible to provide the first electrical conductor of the nobler metal and / or metal alloy and form the second electrical conductor of a less noble metal and / or metal alloy.

Particularly preferably, the hydrophobic layer of fluoropolymers, such as. As polytetrafluoroethylene (Teflon) is formed. Fluoropolymers form a hydrophobic surface that prevents the ingress of water. Alternatively, the hydrophobic layer of another material such. Silicone. Furthermore, it is also possible to provide fats which, however, can migrate and do not remain stationary within the overlapping area.

Optionally, a sealing ring is provided at the end of the first electrical conductor, which is plugged into the sleeve of the second electrical conductor for connection. It encloses the first electrical conductor in the area in which no insulating layer is present. The front side of the first electrical conductor is left free in order to be able to come into direct contact with the sleeve. The sealing ring is usually made of a metal such. As aluminum or copper or of a metal alloy. It also serves as an insertion aid, which facilitates the insertion of the first electrical conductor into a sleeve.

The sealing ring may be cylindrical. But it can also have a conical shape, with a taper towards the front side of the first electrical conductor out or away from it.

But it is also possible to dispense with such a sealing ring at the end of the first electrical conductor.

In a preferred embodiment, the first electrical conductor is formed of aluminum. Preferably, the second electrical conductor consists of copper. In particular, it is an aluminum / copper compound (Al / Cu compound).

Advantageously, it is an electrical conductor made of aluminum, which is connected to a copper plug, preferably a standardized copper plug or with a transition piece to a plug.

Compounds of aluminum and copper are of great interest. Copper is a good electrical conductor. To reduce the weight of an electric line, the lighter and cheaper aluminum is used. Often, plugs are made of copper. Especially in applications in vehicles, the use of copper plugs is common. To be able to rely on established plug, therefore, a suitable connection between aluminum and copper is necessary.

However, the connection can also be formed between two cable-shaped electrical conductors.

But it is also possible to connect a first electrical conductor made of copper with a second electrical conductor made of aluminum. Basically, the first electrical conductor and the second electrical conductor in each case z. Example of aluminum, copper, silver, brass, bronze, tin or other metals and / or metal alloys.

To produce a compound according to the invention, a first and a second electrical conductor are provided, wherein the two conductors are formed of metals or metal alloys with different standard potentials. The first conductor, which is a thin, long object, is covered with an insulating sheath. The method is characterized in that a hydrophobic layer is arranged between the insulating jacket and at least one of the electrical conductors, so that the electrical connection is corrosion-resistant. The order of the individual steps of the method can be changed depending on the application. Thus, e.g. already attached as part of a deployment step, the hydrophobic material on the first or second conductor. However, it is also conceivable that the hydrophobic material is injected after the joining of the electrical conductors to the desired location.

In particular, the first electrical conductor, coated with an insulating sheath, in the form of a cable, provided, wherein at one end of the electrical conductor protrudes from the jacket. The first conductor is inserted into the sleeve of the second electrical conductor, so that an overlap region is formed. Subsequently, the sleeve is pressed in a form-fitting manner on the first electrical conductor. The pressing of the sleeve takes place with as uniform a force as possible from all sides to the center of the conductor, so that both a good contact of the two electrical conductors is formed, as well as a dense overlap region.

Alternatively, the tightness can be improved by the use of a thicker hydrophobic layer.

The pressing of the sleeve is usually carried out mechanically, for. B. with the help of a pair of pliers, in particular with a crimping pliers. The sleeve and the electrical conductor are positively connected.

Advantageously, the pressing of the sleeve on the first electrical conductor using the electromagnetic pulse technology (EMP technology) is performed.

For this purpose, the sleeve is placed with the inserted first electrical conductor within a stable magnetic coil. The sleeve and the electrical conductor are aligned such that the resulting overlap region is located in the middle of the magnetic coil. A high current pulse is generated and passed through the magnetic coil, creating a strong magnetic field in the coil. This magnetic field generates within the sleeve a current, which in turn generates an internal magnetic field oppositely directed to the external magnetic field. As a result, the magnetic coil and the sleeve repel each other. The resulting electromagnetic force pulse causes a radial compression of the sleeve. The sleeve is abruptly pressed onto the inside of the end of the first electrical conductor. By a pulse, both the electrical contact as well as the tightness is produced. But it is also possible to make the connection by a plurality of pulses, in particular by two pulses. In this case, the electrical contact is established by the first pulse and the tightness is also realized by a second pulse.

Compared to using forceps, EMP technology offers several advantages. Within the connection, the contact between the electrical conductor and the sleeve is homogeneous over the entire surface. This means an improved electrical conductivity. At the same time, the tightness of the overlapping area is increased. In addition, it is a non-contact, fast and also automatable method that delivers very consistent products.

But it may also be advantageous to traditionally perform the pressing of the sleeve, especially for small quantities of desired compounds in which it is too expensive to optimize the process parameters.

In a particularly preferred method, a hydrophobic layer is attached to the inside of the sleeve in the region of the opening before connecting the two electrical conductors. Preferably, it is sprayed or painted on. By connecting the first electrical conductor to the second electrical conductor, the hydrophobic layer is located in the overlapping region between the inside of the sleeve and the insulating layer of the first electrical conductor.

From the following detailed description and the totality of the claims, there are further advantageous embodiments and feature combinations of the invention.

Brief description of the drawings

The drawings used to explain the embodiment show: <Tb> FIG. 1 <sep> is a schematic cross section of a cable and a plug to be connected to each other; <Tb> FIG. 2a-c <sep> three embodiments of a first electrical conductor and a second electrical conductor, which are connected to each other; <Tb> FIG. 3a-c <sep> a method of manufacturing the connection of a first and a second electrical conductor; <Tb> FIG. 4a, b <sep> show two alternative embodiments of the back side of a sleeve; <Tb> FIG. 5 <sep> an alternative embodiment of the device for connecting two electrical conductors.

Basically, the same parts are provided with the same reference numerals in the figures.

Ways to carry out the invention

Fig. 1. shows an example of a cable 1 and a plug 2, which are to be connected to each other. The cable 1 comprises an electrical conductor, e.g. Example of an aluminum wire 3, which is covered by an insulating layer 4 (eg., Polyethylene). At the end of the cable 1, which is prepared for connection to the plug 2, there is an insulating layer-free region 5 of the aluminum wire 3. That is, the aluminum wire 3 protrudes by a certain length (which, for example, is larger than the diameter of the cable 1) out of the tubular jacket formed by the insulating layer 4.

The plug 2, which forms the second electrical conductor, for example, consists of copper and is formed as a sleeve 6. The sleeve 6 has an input region 7 and a contact region 8, each of which forms a circular cylindrical cavity. As a result, there is a shoulder 9 between the input region 7 and the contact region 8. The outer side of the sleeve 6 is likewise circular cylindrical and may have the same outer diameter in the input region 7 as in the contact region 8 , The insulating layer-free region 5 of the aluminum wire 3 fits into the contact region 8. Furthermore, the cable 1 should have space with its insulating layer 4 in the entrance area 7.

Figures 2a-c show three embodiments of connections 10a-c of the cable 1 with the plug 2. The simplest connection 10a is shown in Figure 2a. The cable 1 is inserted into the sleeve 6 with the end having the insulating layer-free area 5. In this case, the diameters of the contact region 8 and of the aluminum wire 3 are precisely fitting, so that a planar mechanical and electrical contact results. The result is direct contact between aluminum wire 3 and copper sleeve 6 both on the front side 11 as well as on the lateral surface 12 of the aluminum wire 3. The interior (input area and contact area) of the sleeve 6 is so deep that the total Cable 1 protrudes so far into the interior of the sleeve 6 that (in the longitudinal direction of the cable 1), an overlap region 13 between the sleeve 6 and the insulating layer 4 is formed. The overlapping area 13 is z. B. 15 mm long. He is responsible for ensuring that the entire contact surface between aluminum wire 3 and connector 2 is isolated from the ambient atmosphere.

The compound 10b, which is shown in Fig. 2b, is largely constructed as compound 10a, but additionally has a hydrophobic layer 14 in the overlap region 13 between the sleeve 6 and the insulating layer 4. The hydrophobic layer 14 is e.g. a layer of polytetrafluoroethylene having a thickness in the range of 10-100 micrometers, e.g. 20 microns. The hydrophobic layer 14 closes off the contact surface between the two electrical conductors to the environment. Moisture is prevented from creeping past the hydrophobic layer.

As a third embodiment, the connection 10c, shown in Fig. 2c, on the aluminum wire 3 in the insulating layer-free area 5, a sealing ring 15. Thus, in this embodiment, the direct contact between aluminum wire 3 and copper sleeve 6 only at the end face 11th

The method for producing a connection 10b between the cable 1 and the plug 2 is shown schematically in FIGS. 3a-c.

Cable 1 and plug 2 are aligned with each other (Fig. 3a). The aluminum wire 3 has a diameter D1 in the insulating layer-free area 5. The aluminum wire 3 together with insulating layer 4 has outer diameter D2, which is greater than the diameter D1. The sleeve 6 has a two-stage interior, consisting of entrance area and contact area. Inside the sleeve 6, the interior is narrower. It is the contact area and has a diameter D3 which is deeper than the insulating layer-free area 5 of the first electrical conductor. The interior of the sleeve 6 is wider towards the outside and takes in the entrance area the diameter D4. In order to be able to insert the cable 1 into the sleeve 6 of the second electrical conductor 2, the diameter D3 must be greater than the diameter D1 and the diameter D4 greater than the diameter D2 (FIG. 3b). So z. B. the diameter D1 = 10 mm. With an insulating layer of 1.5 mm layer thickness, the outer diameter D2 = 13 mm. A matching sleeve 6 has z. B. in the contact area a diameter D3 = 10.5 mm and in the entrance area a diameter D4 = 13.4 mm. In this case, the diameter does not necessarily have to be round, then the smallest diameter on the sleeve 6 with the largest diameters on the first electrical conductor to vote and possibly also to take into account the fit. On the nested electrical conductors 1 and 2 pressure is exerted from the outside, for example by means of electromagnetic pulse method. For this purpose, the sleeve 6 are positioned with the inserted cable 1 in the middle of a stable magnetic coil. The area where the overlap area is created must be in the middle of the magnet coil. Through the magnetic coil, a high-current pulse e is passed, whereby in the magnetic coil, a strong magnetic field is generated. This magnetic field generates within the sleeve 6 a current, which in turn generates a magnetic field opposite to the external magnetic field. As a result, the magnetic coil and the sleeve 6 repel each other and the sleeve 6 is compressed uniformly from the outside. The diameters D3 and D4 are reduced simultaneously by a pulse, so that the sleeve rests tightly on the cable 1 (FIG. 3c). In the described method, a hydrophobic layer 14 made of Teflon is provided in the entrance area of the sleeve 6. This is located after the compression of the sleeve in the overlapping region between the sleeve 6 and insulating layer. 4

Two alternative embodiments of a sleeve of a second electrical conductor 2 are shown in FIGS. 4a, b. The sleeve 20 (FIG. 4 a) has a recess 21 (cavity) on one side and a cylindrical pin 22 with a constant outside diameter on the other, closed side 21. This is suitable to attach there in a separate step, a plug, z. B. by welding. This embodiment makes it possible to attach a plurality of different plugs without having to specify this in an early step of production.

In contrast, on the sleeve 25 (FIG. 4b), a pin 27 is already formed on the side facing away from the recess 26. Between the pin and the closed end of the sleeve 25, a tapered portion (neck) may be formed. Thus, by pressing the sleeve 25 on a first electrical conductor, a finished product is produced. The attachment of such sleeves 25 is thus time-saving.

FIG. 5 shows an alternative embodiment of the device according to the invention.

A cable 1, comprising an electrical conductor 3, which is covered with an insulating jacket, is connected to a second electrical conductor 31. The second electrical conductor is designed as a short plug 32. The direct contact 33 between the two electrical conductors 1 and 31 is welded, for example, and embedded in an enveloping polymer layer 34. The polymer layer 34 includes the cable so that it overlies the insulating jacket. The electrical conductor 3 is thus completed by its environment. In contrast, the second electrical conductor 31 has no casing. However, it too is enveloped by the polymer layer 34. In the edge region of the polymer layer 34, a hydrophobic layer 35 is provided at the contact surface between the second conductor 31 and the polymer layer 34, which prevents the penetration of moisture to the direct contact 33 of the two conductors.

In a very thin in relation to the diameter of the aluminum wire insulating layer, the diameter of the aluminum wire and the entire electrical conductor are almost equal, z. B. D1 = 10.5 mm and D2 = 11.5 mm. In that case, it is not absolutely necessary for the sleeve to have a two-step depression. A sufficiently deep recess with a constant diameter of z. B. 12 mm can be used well in this case.

In another embodiment, it is also possible to provide a connection with a sealing ring on the aluminum wire, which has no hydrophobic layer in the overlap region between the sleeve and the insulating layer.

In the preparation of the electrical connection, it is equally possible to provide the hydrophobic layer on the insulating jacket and not on the inside of the sleeve.

Optionally, the compound is made by the application of two electromagnetic pulses. By the first pulse of the electrical contact is made and thereby reduced D3. The second pulse D4 is then reduced, the sleeve is pressed tightly onto the insulation of the first conductor.

In summary, it should be noted that a connection between two electrical conductors is provided, which is formed corrosion resistant.

Claims (13)

1. Device comprising <a> <sep> a first and a second electrical conductor (3, 6), wherein the first and the second electrical conductor (3, 6) are formed of metals or metal alloys with different standard potentials, <b> <b> <sep> an electrical connection between the first and the second electrical conductor (1, 2), <tb> c) <sep> an insulating jacket surrounding at least one of the electrical conductors (3, 6), characterized in that <tb> d) <sep> a hydrophobic layer is arranged between the insulating jacket and at least one of the electrical conductors, so that the electrical connection is corrosion-resistant. 2. Device according to claim 1, characterized in that the electrical connection between the first and the second electrical conductor (3, 6) is formed by a direct contact. 3. Apparatus according to claim 1 or 2, characterized in that the insulating jacket and the first electrical conductor form an insulated cable, and that the electrical conductor protrudes from the jacket and thus forms an insulating layer-free area. 4. Device according to one of claims 1 to 3, characterized in that the second electrical conductor (6) at one end a sleeve (6), wherein one end of the first electrical conductor (3) in the sleeve (6) of the second electrical conductor (2) protrudes, so that the electrical connection is located in an inner space of the sleeve. 5. The device according to claim 4, characterized in that the insulating jacket protrudes into the interior of the sleeve (6) and that the hydrophobic layer is disposed in an overlapping region between the sleeve and the jacket. 6. Device according to one of claims 1 to 5, characterized in that a standard potential of the metal or the metal alloy of the first electrical conductor is lower than a standard potential of the metal or the metal alloy of the second electrical conductor. 7. Device according to one of claims 1 to 6, characterized in that the hydrophobic layer (14) consists of a fluoropolymer. 8. The device according to claim 7, characterized in that the hydrophobic layer (14) consists of polytetrafluoroethylene. 9. Device according to one of claims 1 to 8, characterized in that the first conductor consists essentially of aluminum and the second conductor consists essentially of copper. 10. A method of manufacturing a device comprising the steps of: a) providing a first and a second electrical conductor (3, 6), wherein the first and the second electrical conductor (3, 6) are formed from metals or metal alloys with different standard potentials, <b> <b> providing an insulating jacket which surrounds at least one of the electrical conductors (3, 6), <tb> c) <sep> Establishing an electrical connection between the first and the second electrical conductor (1, 2), characterized in that <tb> d); <sep>, a hydrophobic layer is arranged between the insulating jacket and at least one of the electrical conductors, so that the electrical connection is corrosion-resistant. 11. The method according to claim 10, characterized in that the insulating jacket and the first electrical conductor (3) are provided in the form of a cable with a protruding from the jacket end of the electrical conductor and that the electrical conductor with the insulating jacket in a Inserted by the second electrical conductor sleeve (6) is inserted and the sleeve (6) is positively pressed onto the first electrical conductor (3) and the jacket. 12. The method according to claim 11, characterized in that the sleeve (6) of the second electrical conductor is pressed by means of electromagnetic pulse method on the first electrical conductor. 13. The method according to any one of claims 10 to 12, characterized in that prior to the insertion of the first electrical conductor (1) in the sleeve (6) on the inside of the sleeve (6), a hydrophobic layer (14) is applied.