Method for electrically conductive connection of contact points

Abstract

The invention relates to a method for connecting first contact points (K1+, K1-) with each associated second contact point (K2+, K2-), wherein a twisted cable (1) is automatically laid by means of a laying device and first ends (E11, E21) of conductors (A1, A2) of the twisted cable (1) are connected to each of the first contact points (K1+, K1-) and second ends (E12, E22) of the conductors (A1, A2) - be connected to the second contact point (K2+, K2-) assigned to the respective first contact point (K1+, K1-), or - are connected to an intermediate contact point (Z1, Z2) and then connecting conductors (V1, V2) are connected to one of the intermediate contact points (Z1, Z2) and to the second contact point (K2+, K2-) that is assigned to the first contact point (K1+, K1-) connected to the intermediate contact point (Z1, Z2), wherein the respective conductor (A1, A2) is identified by the laying device and assigned to the first contact point (K1+, K1-) and to the second contact point (K2+, K2-) to be electrically connected to the first contact point (K1+, K1-), wherein at least the connection of the second end (E12, E22) of the respective conductor (A1, A2) to the second contact point (K2+, K2-) or the connection of the respective intermediate contact point (Z1, Z2) via the connecting conductor (V1, V2) to the second contact point (K2+, K2-) only takes place, after the wires (A1, A2) were identified and assigned.

Description

[0001] The invention relates to a method for electrically conductively connecting contact points.

[0002] DE 10 2017 101 471 A1 describes the use of a two-wire bus in the form of a twisted cable.

[0003] The invention is based on the object of providing a method for electrically conductively connecting contact points that is improved compared to the prior art.

[0004] The object is achieved according to the invention by a method for the electrically conductive connection of contact points having the features of claim 1.

[0005] Advantageous embodiments of the invention are the subject of the subclaims.

[0006] In a method according to the invention for the electrically conductive connection of first contact points to a respective associated second contact point, a twisted cable is laid automatically by means of a laying device. First ends of wires of the twisted cable are each connected, in particular automatically by means of the laying device, to one of the first contact points. Second ends of the wires are connected, in particular automatically by means of the laying device, either to the second contact point associated with the respective first contact point, or they are each connected to an intermediate contact point, and then connecting conductors, for example electrically conductive connectors, are each connected, in particular automatically by means of the laying device, to one of the intermediate contact points and to the second contact point associated with the first contact point connected to the intermediate contact point.The respective wire is identified, in particular automatically, by the laying device and assigned to the first contact point and the second contact point to be electrically conductively connected to the first contact point, wherein at least the connection of the second end of the respective wire to the second contact point or the connection of the respective intermediate contact point via the connecting conductor to the second contact point only takes place after the wires have been identified and assigned.

[0007] For laying the twisted cable, the laying device comprises, in particular, a laying head that is movable relative to the contact points. The twisted cable is laid, for example, on a carrier part or a circuit board or printed circuit board. The laying of the twisted cable can be carried out, for example, before the described connection of the ends of the wires or, for example, after the first ends of the wires are connected to the first contact points.

[0008] In particular, it is provided that two first contact points are each electrically connected to an associated second contact point, and a double wire is laid as a twisted cable. This means that the twisted cable has two, in particular exactly two, wires twisted together, also referred to as a twisted pair or twisted-pair cable.

[0009] Automated installation and connection of twisted-pair cables was previously impossible due to the problem of how to connect the ends of the wires to the correct contact point. Therefore, such twisted-pair cables were previously installed manually. This is time-consuming and expensive, especially in high-volume production and especially when the cables are connected with connectors.

[0010] This problem is solved by the method according to the invention. In the method according to the invention, the twisted cable, comprising, for example, two wires twisted together and designed as enamelled wires, is applied in an automated manner, for example using a wire wrapping method, also referred to as winding technology, or in a similar method or in another way, in particular to the carrier part or the circuit board or printed circuit board. The ends of the wires are checked for belonging and contacted accordingly, i.e. connected to the contact points, or the ends are contacted, i.e. coupled or connected to the first contact points and intermediate contact points, and subsequently checked, for example using a continuity test or voltage test, and then connected to the correct second contact points by means of the connecting conductors.The respective connecting conductor can be, for example, an enameled wire or a simple bridge. An enameled wire is, in particular, a wire with enamel insulation.

[0011] The described process is a cost-effective and space-optimized solution. It enables the fulfillment of high quality and safety requirements and is therefore also suitable, for example, for the production of components in high-voltage batteries. The process enables a robust product with a long service life, particularly through a wire threading technique, especially with insulated stranded wires. The thin wires also achieve a low weight. Automation significantly simplifies production. This is particularly advantageous for series production.

[0012] The described method enables, in particular, a cost-effective implementation of an EMC (electromagnetic compatibility) solution using twisted pair cables. The tight intertwining of the particularly thin wires, which are typically designed as thin enameled wires, ensures particularly good EMC performance.

[0013] In one possible embodiment, the twisted cable is laid and then the first ends of the wires are connected or coupled to the respective first contact point and the second ends of the wires are connected or coupled to the respective second contact point or connected or coupled to the respective intermediate contact point, which is then connected or coupled to the second contact point via the connecting conductor.

[0014] In one possible embodiment, the first ends of the wires are connected to the respective first contact point, then the twisted cable is laid and then the second ends of the wires are connected to the respective second contact point or to the respective intermediate contact point, which is then connected to the second contact point via the connecting conductor.

[0015] The wires are identified, for example, by the laying device by means of an electrical testing device of the laying device, which is arranged in particular on the laying head, in which the wires are each tested or at least one of the wires is tested and the two ends belonging to the respective wire are thereby determined, and / or in that the twisted cable has wires of different colors and the wires are identified by their color, and / or in that the twisted cable has wires of different diameters and the wires are identified by their diameter, and / or in that the twisted cable has wires of different materials, for example a wire made of copper and a wire made of aluminum, and the wires are identified by their material,and / or by the twisted cable having an insulated core and an uninsulated core, and the cores being identified based on their presence or absence of insulation. Identification based on color, diameter, material, and / or insulation is performed, for example, by means of a suitable sensor system of the laying device, which is arranged in particular on the laying head. This sensor system is designed, for example, as an optical system, such as a camera system.

[0016] If the wires are each tested or at least one of the wires is tested using the electrical testing device, then this electrical testing device is designed in particular as a voltage tester or continuity tester. If there are only two wires, testing one of the wires is sufficient. For example, the electrical testing device designed as a continuity tester can then be used to determine whether there is continuity and thus the tested first and second ends belong to the same wire, or whether there is no continuity and thus the tested first end belongs to one wire and the tested second end belongs to the other wire. When testing using the testing device designed as a voltage tester, for example, a voltage can be determined or measured at the tested second end of the wire.It can be determined whether the first end of the wire is connected to a positive or negative pole of an electrical voltage source coupled to the first contact points, and thus to which of the two first contact points the first end of the tested wire is connected. The first end of the second wire is then connected accordingly or correspondingly to the other first contact point.

[0017] In particular, it is provided that each of the wires, or at least one of the wires, is tested by means of the testing device designed as a voltage tester after the wires have been connected to the first contact points and before they are connected to the second contact points, or after they have been connected to the first contact points and the intermediate contact points and before the intermediate contact points are connected to the second contact points via the connecting conductors. To enable this testing by means of the testing device designed as a voltage tester, it is provided in particular that the first contact points are each connected to one pole of an electrical voltage source during the test.

[0018] In particular, it is provided that the wires or at least one of the wires is tested by means of the testing device designed as a continuity tester before the wires are connected to the contact points, or after they have been connected to the first contact points and before they are connected to the second contact points, or after they have been connected to the first contact points and the intermediate contact points and before the intermediate contact points are connected to the second contact points via the connecting conductors.

[0019] In one possible embodiment, it is provided that the respective wire is connected to the respective contact point and / or intermediate contact point by means of winding technology, threading technology, soldering or welding, in particular resistance welding.

[0020] The respective wire is made of aluminum or copper, for example.

[0021] If the respective wire has insulation, then it has, for example, a varnish insulation, i.e. the insulation is then designed as a varnish insulation.

[0022] A laying device is provided herein which carries out a method described herein, in particular in an automated manner.

[0023] Embodiments of the invention are explained in more detail below with reference to drawings.

[0024] Showing: Fig. 1 schematically shows a first embodiment of a method for electrically conductively connecting first contact points to an associated second contact point, Fig. 2 schematically shows a variant of a second embodiment of the method, and Fig. 3 schematically shows a further variant of the second embodiment of the method.

[0025] Corresponding parts are provided with the same reference numerals in all figures.

[0026] The Fig. 1 to 3 show exemplary embodiments of a method for the electrically conductive connection of first contact points K1+, K1- with an associated second contact point K2+, K2-, which method in particular enables a good EMC effect.

[0027] To achieve good EMC performance, EMC-compliant daisy chain cables have traditionally been routed in a separate, twisted-pair or otherwise shielded cable harness parallel to a cell voltage tap cable, such as a flexible cable, or directly to a CSE (Cell Supervision Electronics) and connected to it. This is associated with the high costs of a separate cable harness, significant assembly effort, and high weight, and requires additional installation space for the approximately 4 mm thick cables. Furthermore, functional limitations exist, such as routing within the venting space. Furthermore, the numerous existing connector interfaces exhibit corresponding contact resistance, create sources of error, and require complex assembly.

[0028] The advantageous process described below enables a cost-effective and space-optimized solution, fulfillment of high quality and safety requirements in high-voltage batteries, a robust product for a long service life, simple production and low component weight.

[0029] In this method, a twisted cable 1 is laid automatically using a laying device. First ends E11, E21 of cores A1, A2 of the twisted cable 1 are each connected to one of the first contact points K1+, K1-. Second ends E12, E22 of the cores A1, A2 are connected either to the second contact point K2+, K2- assigned to the respective first contact point K1+, K1-, as shown in Fig. 1, or they are each connected to an intermediate contact point Z1, Z2 and then connecting conductors V1, V2 are each connected to one of the intermediate contact points Z1, Z2 and the second contact point K2+, K2- which is assigned to the first contact point K1+, K1- connected to the intermediate contact point Z1, Z2, as shown in the Fig. 2 and Fig. 3 shown schematically. The respective wire A1, A2 is identified by the laying device and assigned to the first contact point K1+, K1- and the second contact point K2+, K2- to be electrically conductively connected to the first contact point K1+, K1-, wherein at least the connection of the second end E12, E22 of the respective wire A1, A2 to the second contact point K2+, K2- or the connection of the respective intermediate contact point Z1, Z2 via the connecting conductor V1, V2 to the second contact point K2+, K2- only takes place after the wires A1, A2 have been identified and assigned, for example by means of the laying device.

[0030] For laying the twisted cable 1, the laying device has, in particular, a laying head that is movable relative to the contact points K1+, K1-, K2+, K2-, for example, fully automatically or robot-guided. The twisted cable 1 is laid, for example, on a carrier part 2, as shown, for example, in the figures, or, for example, on a circuit board or printed circuit board. The laying of the twisted cable 1 can be carried out, for example, before the described connection of the ends E11, E21, E12, E22 of the wires A1, A2 or, for example, after the connection of the first ends E11, E21 of the wires A1, A2 to the first contact points K1+, K1-.

[0031] As in the Fig. 1 to 3, it is particularly provided that two first contact points K1+, K1- are each electrically connected to an associated second contact point K2+, K2-, and a double wire is laid as the twisted cable 1. This means that the twisted cable 1 has two, in particular exactly two, wires A1, A2 twisted together, also referred to as a twisted pair or twisted-pair cable.

[0032] The automated laying and contacting of a twisted pair 1 cable enabled by this method was previously impossible due to the problem of how to connect the ends E11, E21, E12, E22 of the wires A1, A2 to the correct contact point K1+, K1-, K2+, K2-. Therefore, such twisted pair 1 cables were previously laid manually. This is complex and expensive, especially in high-volume production.

[0033] This problem is solved by the method described here. In this method, the twisted cable 1, comprising, for example, two twisted wires A1, A2 formed as enameled wires, also referred to as stranded wires, is applied automatically, for example in a wire wrapping process, also referred to as winding technology, or in a similar process or in another way, in particular to the carrier part 2 or the circuit board or printed circuit board. The ends E11, E21, E12, E22 of the wires A1, A2 are checked for their association and contacted accordingly, i.e. connected to the contact points K1+, K1-, K2+, K2-, as shown in Fig. 1, or the ends E11, E21, E12, E22 are contacted, ie connected to the first contact points K1+, K1- and intermediate contact points Z1, Z2, and subsequently checked, for example with a continuity test or voltage test, and then connected by means of the connecting conductors V1, V2 to the correct second contact points K2+, K2-, as shown in the Fig. 2 and Fig. 3. The respective connecting conductor V1, V2 can be, for example, an enameled wire or a simple bridge. Depending on which intermediate contact point Z1, Z2 the second end E12, E22 of the respective wire A1, A2 is connected to, the connecting conductors V1, V2 are laid, after the wires A1, A2 have been identified and assigned to the contact points K1+, K1-, K2+, K2-, for example, either side by side from the respective intermediate contact point Z1, Z2 to the respective assigned second contact point K2+, K2-, as shown in Fig. 2, or laid crosswise from the respective intermediate contact point Z2, Z1 to the respective assigned second contact point K2+, K2-, as shown in Fig. 3 shown.

[0034] In one possible embodiment of the method, the twisted cable 1 is laid and then the first ends E11, E21 of the wires A1, A2 are connected to the respective first contact point K1+, K1- and the second ends E12, E22 of the wires A1, A2 are connected to the respective second contact point K2+, K2- or to the respective intermediate contact point Z1, Z2, which is then connected to the second contact point K2+, K2- via the connecting conductor V1, V2.

[0035] In one possible embodiment of the method, the first ends E11, E21 of the wires A1, A2 are connected to the respective first contact point K1+, K1-, then the twisted cable 1 is laid and then the second ends E12, E22 of the wires A1, A2 are connected to the respective second contact point K2+, K2- or to the respective intermediate contact point Z1, Z2, which is then connected to the second contact point K2+, K2- via the connecting conductor V1, V2.

[0036] The wires A1, A2 are identified, for example, by the laying device in that the wires A1, A2 are each tested or at least one of the wires A1, A2 is tested by means of an electrical testing device of the laying device, which is arranged in particular on the laying head, and in this way the two ends E11, E21, E12, E22 belonging to the respective wire A1, A2 are determined.

[0037] Alternatively or additionally, the wires A1, A2 are identified, for example, by the laying device, for example by means of at least one camera, in that the twisted cable 1 has wires A1, A2 of different colors and the wires A1, A2 are identified based on their color.

[0038] Alternatively or additionally, the wires A1, A2 are identified, for example, by the laying device, for example by means of at least one camera, in that the twisted cable 1 has wires A1, A2 that differ in terms of their diameter and the wires A1, A2 are identified based on their diameter.

[0039] Alternatively or additionally, the wires A1, A2 are identified, for example, by the laying device, for example by means of at least one camera, in that the twisted cable 1 has wires A1, A2 that differ in terms of their material, for example, one of the wires A1, A2 is made of copper and the other wire A2, A1 is made of aluminum, and the wires A1, A2 are identified based on their material.

[0040] Alternatively or additionally, the wires A1, A2 are identified, for example, by the laying device, for example by means of at least one camera, in that one of the wires A1, A2 of the twisted cable 1 is insulated and the other wire A2, A1 is not insulated and the wires A1, A2 are identified based on their presence or absence of insulation.

[0041] The identification of the wires A1, A2 based on their color, diameter, material, and / or insulation is carried out, for example, by means of a suitable sensor system in the laying device, which is arranged in particular on the laying head. This sensor system is designed, for example, as an optical system, such as a camera system.

[0042] If the wires A1, A2 are each tested or at least one of the wires A1, A2 is tested by means of the electrical testing device, then this electrical testing device is designed in particular as a voltage tester or continuity tester.

[0043] In particular, it is provided that the wires A1, A2 each, or at least one of the wires A1, A2, are / is tested by means of the testing device designed as a voltage tester after the wires A1, A2 have been connected to the first contact points K1+, K1- and before they are connected to the second contact points K2+, K2-, or after they have been connected to the first contact points K1+, K1- and the intermediate contact points Z1, Z2 and before the intermediate contact points Z1, Z2 are connected to the second contact points K2+, K2- via the connecting conductors V1, V2. In order to enable this testing by means of the testing device designed as a voltage tester, it is provided in particular that the first contact points K1+, K1- are each connected to one pole of an electrical voltage source during the test.

[0044] It is particularly provided that the wires A1, A2 each or at least one of the wires A1, A2 are / is tested by means of the testing device designed as a continuity tester before they are connected to the contact points K1+, K1-, K2+, K2-, or after they have been connected to the first contact points K1+, K1- and before they are connected to the second contact points K2+, K2-, or after they have been connected to the first contact points K1+, K1- and the intermediate contact points Z1, Z2 and before the intermediate contact points Z1, Z2 are connected to the second contact points K2+, K2- via the connecting conductors V1, V2.

[0045] In one possible embodiment of the method, it is provided that the respective wire A1, A2 is connected to the respective contact point K1+, K1-, K2+, K2- and / or intermediate contact point Z1, Z2 by means of winding technology, threading technology, soldering or welding, in particular resistance welding.

[0046] The respective wire A1, A2 is made of aluminum or copper, for example.

[0047] If the respective wire A1, A2 has insulation, then it has, for example, a varnish insulation.

[0048] In the examples shown according to the Fig. 1 to 3, the wires A1, A2 are tested and identified, for example, by means of the electrical testing device which, as already mentioned, is installed for this purpose, for example, on the laying head of the laying device, for example on a threading head of the laying device designed as a wire wrapping system.

[0049] In the embodiment according to Fig. 1, for example, the twisted cable 1 is first laid on the carrier part 2. The first ends E11, E21 of the wires A1, A2 are then connected to the respective first contact point K1+, K1-, for example by soldering or resistance welding. The wires A1, A2 are then tested with the electrical testing device, for example with the electrical testing device designed as a voltage tester, in which case the first contact points K1+, K1- are each connected to one pole of an electrical voltage source, in particular a DC voltage source, during the test, or with the electrical testing device designed as a continuity tester. According to this identification, the correct wire A1, A2 is connected to the second contact point K2+, K2- assigned to the respective first contact point K1+, K1-.Alternatively, testing and assignment can be carried out before the wires A1, A2 are connected to the contact points K1+, K1-, K2+, K2-, in particular with the electrical testing device designed as a continuity tester.

[0050] In the embodiment according to the Fig. 2 and Fig. 3, for example, the twisted cable 1 is first laid on the carrier part 2. Then, the first ends E11, E21 of the wires A1, A2 are connected to the respective first contact point K1+, K1-, and the second ends E12, E22 of the wires A1, A2 are connected to the respective intermediate contact point Z1, Z2, for example, by soldering or resistance welding. This does not require testing and identification of the wires A1, A2.

[0051] Only now is the respective wire A1, A2 identified by the laying device and assigned to the first contact point K1+, K1- and the second contact point K2+, K2-, which is to be electrically connected to the first contact point K1+, K1-. This is done, for example, using an electrical testing device designed as a continuity tester. With two wires A1, A2, only one of the wires A1, A2 needs to be tested. More precisely, only one of the first contact points K1+, K1- and one of the intermediate contact points Z1, Z2 needs to be tested. If continuity is established, the tested wire A1, A2 is connected to this first contact point K1+, K1- and intermediate contact point Z1, Z2, and the other wire A2, A1 is connected accordingly to the other first contact point K1-, K1+ and intermediate contact point Z2, Z1.If no continuity is detected, the wire A1, A2 connected to the respective first contact point K1-, K1+ is connected accordingly to the other intermediate contact point Z2, Z1.

[0052] Depending on the result of whether the continuity was detected or not, ie which of the intermediate contact points Z1, Z2 is electrically connected via the wires A1, A2 to which of the first contact points K1-, K1+, the intermediate contact points Z1, Z2 are connected by means of the connecting conductors V1, V2 to the respective second contact point K2-, K2+, either directly, as schematically shown in Fig. 2, or crosswise, as shown schematically in Fig. 3 shown, connected.

[0053] The features and advantages described herein with respect to a method for electrically conductively connecting first contact points to an associated second contact point may also relate to a laying device described herein and vice versa. List of reference symbols 1 twisted cable 2 support part A1, A2 wire E11, E21 first end E12, E22 second end K1+, K1- first contact point K2+, K2- second contact point V1, V2 connecting conductors Z1, Z2 intermediate contact point QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2017 101 471 A1

[0002]

Claims

[1] Method for the electrically conductive connection of first contact points (K1+, K1-) with an associated second contact point (K2+, K2-), characterized by that a twisted cable (1) is laid automatically by means of a laying device and first ends (E11, E21) of wires (A1, A2) of the twisted cable (1) are each connected to one of the first contact points (K1+, K1-) and second ends (E12, E22) of the wires (A1, A2) - be connected to the second contact point (K2+, K2-) assigned to the respective first contact point (K1+, K1-), or - are each connected to an intermediate contact point (Z1, Z2) and then connecting conductors (V1, V2) are each connected to one of the intermediate contact points (Z1, Z2) and the second contact point (K2+, K2-) which is assigned to the first contact point (K1+, K1-) connected to the intermediate contact point (Z1, Z2), wherein the respective wire (A1, A2) is identified by the laying device and assigned to the first contact point (K1+, K1-) and the second contact point (K2+, K2-) which is to be electrically conductively connected to the first contact point (K1+, K1-), wherein at least the second end (E12, E22) of the respective wire (A1, A2) is connected to the second contact point (K2+, K2-) or the respective intermediate contact point (Z1, Z2) is connected to the second contact point (K2+, K2-) via the connecting conductor (V1, V2) only occurs after the wires (A1, A2) have been identified and assigned. [2] Method according to claim 1, characterized bythat two first contact points (K1+, K1-) are each electrically connected to an associated second contact point (K2+, K2-) and a double wire is laid as a twisted cable (1). [3] Method according to one of the preceding claims, characterized by , that - the twisted cable (1) is laid and then the first ends (E11, E21) of the wires (A1, A2) are connected to the respective first contact point (K1+, K1-) and the second ends (E12, E22) of the wires (A1, A2) are connected to the respective second contact point (K2+, K2-) or to the respective intermediate contact point (Z1, Z2), which is then connected to the second contact point (K2+, K2-) via the connecting conductor (V1, V2), or - the first ends (E11, E21) of the wires (A1, A2) are connected to the respective first contact point (K1+, K1-), then the twisted cable (1) is laid and then the second ends (E12, E22) of the wires (A1, A2) are connected to the respective second contact point (K2+, K2-) or are connected to the respective intermediate contact point (Z1, Z2), which is then connected to the second contact point (K2+, K2-) via the connecting conductor (V1, V2). [4] Method according to one of the preceding claims, characterized by that the wires (A1, A2) are identified by the laying device by - at least one of the wires (A1, A2) is tested by means of an electrical testing device of the laying device and the two ends (E11, E21, E12, E22) belonging to the respective wire (A1, A2) are thereby determined, - the twisted cable (1) has cores (A1, A2) of different colours and the cores (A1, A2) are identified by their colour, - the twisted cable (1) has cores (A1, A2) that differ in diameter and the cores (A1, A2) are identified by their diameter, - the twisted cable (1) has cores (A1, A2) that differ in their material and the cores (A1, A2) are identified by their material, and / or - the twisted cable (1) has an insulated core (A1, A2) and a non-insulated core (A2, A1) and the cores (A1, A2) are identified by their presence or absence of insulation. [5] Method according to claim 4, characterized by that the at least one wire (A1, A2) is tested by means of an electrical testing device designed as a voltage tester or continuity tester. [6] Method according to claim 5, characterized by that the at least one wire (A1, A2) is tested by means of the testing device designed as a voltage tester, - after the wires (A1, A2) have been connected to the first contact points (K1+, K1-) and before they are connected to the second contact points (K2+, K2-), the first contact points (K1+, K1-) being connected to one pole of an electrical voltage source during the test, or - after the wires (A1, A2) have been connected to the first contact points (K1+, K1-) and the intermediate contact points (Z1, Z2) and before the intermediate contact points (Z1, Z2) are connected to the second contact points (K2+, K2-) via the connecting conductors (V1, V2), the first contact points (K1+, K1-) being connected to one pole of an electrical voltage source each during the test. [7] Method according to claim 5, characterized bythat the at least one wire (A1, A2) is tested by means of the test device designed as a continuity tester, - before the wires (A1, A2) are connected to the contact points (K1+, K1-, K2+, K2-), or - after the wires (A1, A2) have been connected to the first contact points (K1+, K1-) and before they are connected to the second contact points (K2+, K2-), or - after the wires (A1, A2) have been connected to the first contact points (K1+, K1-) and the intermediate contact points (Z1, Z2) and before the intermediate contact points (Z1, Z2) are connected to the second contact points (K2+, K2-) via the connecting conductors (V1, V2). [8] Method according to one of the preceding claims, characterized by that the respective wire (A1, A2) is connected to the respective contact point (K1+, K1-, K2+, K2-) and / or intermediate contact point (Z1, Z2) by means of winding technology, threading technology, soldering or welding. [9] Method according to one of the preceding claims, characterized by that the respective wire (A1, A2) is made of aluminum or copper. [10] Method according to one of the preceding claims, characterized by that the respective wire (A1, A2) has a varnish insulation.

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