Semi-finished electrical power conductor line for an electric machine

Abstract

Semi-finished electrical power conductive line of an electrical machine One aspect of the invention relates to a semi-finished electrical power conductive line for an electrical machine comprising a first and second conductive trace 1, 2 respectively comprising a first and second free edge 1s, 2s, and a first and a second longitudinal face 1i, 2i opposite one another and comprising a solder surface portion 10Si, 20Si facing one another with a clearance J of less than 0.6mm. The first trace 1 further comprises a protection section 10p comprising a protection surface 10pi, opposite the clearance J, extending from a flat surface of the second face 1i to at least one plane P extending from an edge between the free edge 2s and the weld surface portion 20Si of the second trace 2, the plane P being parallel to the weld surface portion 10Si of the first trace 1. Figure to be published with the abstract: Figure 3

Description

Title of the invention: Semi-finished electrical power conductive line for an electrical machine TECHNICAL FIELD OF THE INVENTION

[0001] The technical field of the invention is that of electrical power conductive lines of a rotating electrical machine in the field of motor vehicles.

[0002] The present invention relates in particular to a semi-finished electrical power conductive line. TECHNOLOGICAL BACKGROUND OF THE INVENTION

[0003] The electrical machines comprise active windings of the rotor and / or the stator which are connected to various electronic power components located in an electronic box fixed in or outside the electrical machine. These components provide a reversible analog-to-DC power converter function ("AC / DC" according to the commonly used English terminology). In the alternator operating mode of the rotating electrical machine, the aforementioned converter ensures the rectification of the alternating phase voltages produced by the electrical machine in an alternator mode into a single DC supply voltage (typically 48 Volts) which supplies an on-board power supply network of the motor vehicle.Conversely, as is well known to those skilled in the art, in the motor / starter operating mode of the rotating electrical machine, the converter provides phase voltages which supply stator windings of the rotating electrical machine.

[0004] Thus, conductive lines make it possible to connect the electronic box to a battery voltage or to the windings (which may in particular have a trace shape of rectangular section in certain cases). However, the size and cost of these conductive lines must be minimized while preserving the quality of the connectors.

[0005] Such a conductive line, as represented for example in [Fig.l], requires for a positive voltage line +, for example 48V or ground -, a connection of a first conductive trace 1 to a second trace 2. The first trace or second trace can be for example a winding output or a trace of a connector, and respectively the second trace or the first trace can be a trace connected to the power electronic component of the electronic box. The connection of the two traces 1, 2 must be made on the side of a free edge of each of the two traces 1, 2 by soldering a part of each trace 1, 2 to each other. One of the fast, cheap, and very good quality connections is soldering laser. However, such laser welding requires having a very small clearance, for example less than 0.6 mm between two surfaces lOSi, 20Si of the welding parts. One of the solutions is to carry out a tight assembly between the two welding parts, however such a solution is very difficult to achieve due to the manufacturing and assembly tolerances between the two traces as well as those of the parts supporting them. In this example, a housing 3 supports the first trace 1, the housing 3 is in particular overmolded on a part of the first trace 1, an aluminum heat sink 5 comprises an opening crossed by a portion of the first trace 1 comprising the welding part and being fitted with the first housing 3, and a second plastic housing 4 enveloping, for example by overmolding, at least a portion of the second trace 2.In this example, a thermal and electrically insulating glue is located between the heat sink 5 and the second trace 2. The two housings 3, 4 as well as the heat sink 5 each have manufacturing and assembly tolerances, but also expansion tolerances between them imposing a positive clearance of less than 0.6mm for laser welding.

[0006] However, this clearance still allows a laser beam transmitted by the laser welding apparatus to pass between the two surfaces 10Si, 20Si which can damage the part located opposite (below) this clearance, for example a part of the housing 3 overmolded on the first trace 1 can be located opposite this laser beam. The laser beam will in fact in this case heat up to burn this part of the housing and thus, on the one hand damage it and on the other hand produce smoke which can prevent the proper functioning of the laser welding. One of the solutions was therefore to remove any part of plastic at the level of the first trace 1, under the laser welding focal plane. In [Fig.l], to avoid damaging the laying pallets or any other device located below the focal plane, a metal shield 9 has been glued to the housing 3, a part of which is located opposite the gap to absorb the beam passing through the gap during the laser welding assembly phases. This shield 9 thus absorbs the energy of the laser beam passing through the gap between the two metal traces to be welded. However, this metal shield 9 generates many assembly constraints during the manufacturing process and resistance to environmental tests while it only provides a protective function to carry out the laser welding operation. In particular, this involves a step of gluing the metal shield 9 to the housing 3 which may have defects of glue overflow, a potential setting of the metal shield 9, as well as a protection of the metal shield 9 or the obtaining of a metallic material resistant to salt spray.

[0007] There is therefore a need to find a solution to the problem of beam crossing the clearance that is less restrictive than the solution of the metal shield. Summary of the invention

[0008] The invention offers a solution to the problems mentioned above, by making it possible to have a connector whose traces are improved to reduce the gap at their connection end.

[0009] One aspect of the invention relates to a semi-finished electrical power conductive line for an electrical machine comprising: • a first electrically conductive trace and a second electrically conductive trace respectively comprising a first and second free edge, each trace comprising: • a first longitudinal face and a second longitudinal face opposite each other, • a connection portion comprising a weld section extending from the free edge and each comprising a part of the weld surface of the corresponding second face, facing each other with a clearance J of less than 0.6 mm, • a first folding portion extending from the connection portion comprising a fold forming a concave surface on the side of the first face.

[0010] The connection portion of the first trace comprises, between the weld section and the first bending portion, a protection section comprising a protection surface, facing the clearance J and extending from a part of the flat surface of the second face of the connection portion to at least one plane P passing through an edge between the second free edge and the surface of the weld portion of the second trace, the plane P being parallel to the part of the weld surface of the first trace.

[0011] Thanks to the invention, having a protective section comprising a protective surface located opposite the gap J makes it possible to absorb the energy of the laser beam passing through the gap J during welding. In addition, this makes it possible to avoid adding an additional protective part such as a metal shield. Finally, this makes it possible to mount and produce a housing having a protected part between the connecting end and the protective portion.

[0012] In addition to the characteristics which have just been mentioned in the preceding paragraph, the connector according to one aspect of the invention may have one or more complementary characteristics among the following, considered individually or according to all technically possible combinations.

[0013] According to one embodiment, the protective section forms a hollow on the first face and a projection on the second face forming the protective surface opposite the hollow. This allows only adding a deformation step of the first trace to form this section without modifying the rest of the trace.

[0014] According to one example, the first trace comprises a punch forming the projection and the hollow.

[0015] According to a variant of this embodiment, the protective section extends from the connecting end and the protective surface is a fold formed on the side of the second face from which an intermediate section extends comprising two surfaces parallel to the plane P to the welding section. According to one example, the fold of the folding portion comprises a part of the side of the connecting end opposite the clearance J. This embodiment has the disadvantage, compared to the previous embodiment, of changing the location of the fold of the protective section during the manufacturing process of the first trace and of adding a second fold extending from the protective section and a third fold extending from the parallel section to form between them the protective surface of the protective section.

[0016] According to one embodiment, the line comprises a first plastic housing enveloping at least the first folding portion of the first trace.

[0017] According to one example, the first housing comprises a part overmolded on the protective section on the side of the second face. This allows good maintenance of the first trace and thus improves the efficiency of the welding.

[0018] According to an example of this embodiment and that comprising a projection and a recess, a first portion of the projection is covered by the overmolded portion of the housing and a second portion of the projection comprises the protective surface.

[0019] According to an example of this embodiment, the conductive line further comprises: • an aluminum heat sink comprising an opening crossed by the connection portion of the first trace and being fitted with the first housing, • a second plastic casing surrounding, for example by overmolding, at least the first folding portion of the second trace, the second casing being fixed to the heat sink.

[0020] According to one example, an electrically insulating thermal glue is located between the second trace and the heat sink to bond them together. This improves the thermal transmission from the second trace to the heat sink.

[0021] According to a variant of this embodiment, the line comprises a single housing overmolded on the two traces.

[0022] According to one embodiment, the protective section is closer to the first folding portion than to the first free edge. This makes it possible to reduce the power of the laser beam on the protective portion.

[0023] According to a variant of this embodiment, the protective section is closer to the first free edge than to the first folding portion. This makes it possible, for example, to increase the covering surface of the part of the housing overmolded on the second face of the trace between the first folding portion and the protective surface.

[0024] According to one embodiment, the first free edge and the second free edge are each located in a plane parallel to each other at a distance of less than 0.5 mm.

[0025] According to one embodiment, the connection portion of the second trace is formed entirely by the solder section.

[0026] According to one embodiment, the first connection portion comprises an intermediate section comprising two flat surfaces each parallel to the plane P extending from the weld section to the protection section, the two weld sections being delimited longitudinally with each other by the clearance J less than 0.6 mm between them.

[0027] A second aspect of the invention relates to a method for manufacturing a semi-finished conductive line according to the first aspect of the invention with or without the various combined characteristics or according to only one of the embodiments described previously, the method comprising the steps: • folding of a first and second initially planar trace forming the folding portion of the first and second trace respectively, • deformation of the first trace between the first free edge and the folding portion forming the protective section of the connection portion such that the protective surface extends in an inclined manner relative to a part of the flat surface of the second face of the connection portion, and • positioning the second trace in relation to the first trace so that the two parts of the welding surface are opposite each other with a clearance of less than 0.6 mm.

[0028] According to one example, the line is according to the embodiment comprising a housing, and the method further comprises inserting the first trace into the first housing or overmolding the first housing onto the first trace.

[0029] According to one example, the line is according to the embodiment comprising the heat sink and the second housing, the method further comprises: • a step of inserting the second trace into the second housing or a step of overmolding the second housing onto the second trace, and • a step of bonding using an electrically insulating thermal glue a flat surface of the second face of the second trace to a flat surface of the heat sink.

[0030] The installation step comprises a sub-step of inserting the connection portion through the opening of the heat sink until the heat sink fits into the first housing.

[0031] A third aspect of the invention relates to a method of manufacturing a voltage conductive line from a semi-finished conductive line according to the first aspect of the invention, with or without the different combined characteristics, or according to only one of the embodiments described previously, the method comprising the steps: • placement of a laser welding device to transmit a laser beam oriented in line with and opposite the first and second free edges of the first and second traces, • laser welding in which the welding device transforms electrical energy into a laser beam so that the beam is movable relative to the semi-finished conductive line so that the beam moves along a plurality of paths from the first free edge to the second free edge and vice versa crossing the clearance J, the beam heating on each path, the first trace at the first free edge, through the clearance J the protection section at the protection surface and the second trace at the second free edge, the number of paths being carried out until the first and second traces of the free edge are melted to a limited depth along the trace.

[0032] A fourth aspect of the invention relates to an electrical power conductive line for an electrical machine comprising: • a first electrically conductive trace and a second electrically conductive trace welded to each other by a laser-type fusion welded zone connecting the first trace to the second trace, the first trace and the second trace further comprising: • a first longitudinal face and a second longitudinal face opposite each other, • a first folding portion comprising a fold forming a concave surface on the side of the first face, and • a first plastic casing enveloping at least the first folding portion of the first trace.

[0033] The first trace comprises a connection portion extending between the welded zone and the first folding portion, comprising on the side of the second face a protection section comprising a protection surface facing the welded zone in a direction parallel to a plane running along a surface of an intermediate section of the connection portion extending from the welded zone.

[0034] According to one example, an electrically insulating thermal tab is located in the opening of the heat sink surrounding a section of the first trace. This improves thermal transmission from the first trace to the heat sink.

[0035] A fifth aspect relates to a connector comprising a conductive line according to the first aspect of the invention according to the embodiment comprising the first housing.

[0036] The invention and its various applications will be better understood upon reading the following description and examining the accompanying figures. BRIEF DESCRIPTION OF THE FIGURES

[0037] The figures are presented for information purposes only and in no way limit the invention.

[0038] [Fig.l] shows a schematic representation according to a section of a semi-finished conductive line according to the prior art.

[0039] [Fig.2A] represents a section of a part of a semi-finished conductive line according to an example of the first embodiment of the invention.

[0040] [Fig.2B] represents an enlargement of a part of [Fig.2A].

[0041] [Fig.3] represents a principle diagram according to the section of [Fig.2A] of the line semi-finished conductive with welding device before welding according to an example of the first embodiment of the invention.

[0042] [Fig.4] represents a schematic diagram of a finished conductive line comprising a solder area connecting two traces to each other. DETAILED DESCRIPTION

[0043] The figures are presented for information purposes only and in no way limit the invention.

[0044] [Fig.2A] shows a schematic representation, in section, of a first embodiment of a semi-finished electrical power conductor according to a first aspect of the invention. The semi-finished electrical power conductor line may be that of an internal power connector, for example of a direct voltage for an electronic box of an electrical machine of a motor vehicle.

[0045] The semi-finished electrical power conductive line comprises a first electrically conductive trace 1, in this case positive, for example intended to be connected to a 48 Volt battery terminal and a second electrically conductive trace 2 arranged relative to each other to be connected by laser welding. In the following, the faces, or surfaces, or zones, or portions or section of the first trace 1 include in their reference the number “1” and those of the second trace 2 include in their reference the number “2”.

[0046] Each of the first and second traces 1, 2 comprises a first longitudinal face 1e, 2e also called external face, having in their reference the letter “e” and a second longitudinal face 1i, 2i, also called internal face, having in their reference the letter “i”. Each trace further comprises two non-referenced longitudinal edges each connecting the first face 1e, 2e, to the corresponding second face 1i, 2i.

[0047] Each of the first and second traces 1, 2 comprises a first and second free edge 1s, 2s, also connecting the first face 1c, 2e, to the second face 1i, 2i as well as the two longitudinal edges. In [Fig.2A], the two free edges 1s, 2s are shown aligned in the same plane, but according to manufacturing tolerances, they may be offset from each other, for example by a difference of 0.5 mm. In other words, the first free edge 1s and the second free edge 2s are each located in a parallel plane (plus or minus a manufacturing angular tolerance, for example 1°) from each other by a distance of less than 0.5 mm.

[0048] The first trace 1 comprises at least a first fold forming a folding portion 11, and a connection portion 10 extending from the first folding portion 11 to the first free edge 1s. The delimitation between the folding portion 11 and a connecting end of the connection portion 10 is formed by the end of the curvature of the fold forming a concave surface on the side of the first face 1c.

[0049] The second trace 2 comprises at least a first fold forming a folding portion 21, and a connection portion 20 extending from the first folding portion 21 to the second free edge 2s. The delimitation between the folding portion 21 and a connecting end of the connection portion 20 is formed by the end of the curvature of the fold forming a concave surface on the side of the first face 2e. In this figure, dotted lines represent the connecting end of the connection portion 20.

[0050] The connection portion 10 of the first trace 1 comprises a weld section 10S extending from the first free edge 1s comprising a weld surface portion 10Si facing a portion of a weld surface 20S of the second face 2i of a weld section 20S of the second trace 2 extending from the second free edge 2s. Each weld section 10S, 20S is delimited from the corresponding free edge 1s, 2s to the fold of the second trace 2. Each weld surface portion 20S and 10S faces each other with a clearance of less than 0.6 mm. In the case where the two free edges 1s and 2s are not aligned in the same plane, one of the two weld surface portions 20S, 10S is longer than the other. In this example, the two parts of the solder surface lOSi, 20Si are parallel to each other but could be slightly inclined.

[0051] The connection portion 10 of the first trace 1 further comprises, between the solder section 10S and the connection end, a protection section 10p comprising a protective surface lOpi, opposite the clearance J. As visible in [Fig.2B], representing a part of [Fig.2A], the protective surface lOpi extends from a flat surface of the second face li of the connection portion 10 to at least one plane P extending from an edge between the second free edge 2s and the solder surface portion 20Si of the solder section 20S of the second trace 2. The plane P is parallel to the solder surface portion lOSi of the first trace 1. Here in this case, it extends into the solder surface portion 20Si of the solder section 20S of the second trace 2 since the latter is parallel to the solder surface portion lOSi.

[0052] In this example, the connection portion 10 further comprises an intermediate section 10m referenced in [Fig.2B], extending from the weld section 10S to the protection section 10p. Dotted lines represent the delimitation between the weld section 10S and the intermediate section 10m. The intermediate section 10m therefore comprises a part of the second face 2i facing the fold of the first folding portion 21 of the second trace 2 and comprises the flat surface from which the protection surface 10p extends.

[0053] The first connection portion 10 of the first trace 1 extends, along a first measured length, from the first folding portion 11 to the first free edge 1s. In this example, the length of the connection portion 20 of the second trace 2 is much less than that of the connection portion 10 of the first trace 1. Indeed, the connection portion 20 of the second trace 2 corresponds in this example to the weld section 20S. In other words, in this example, the connection portion 20 of the second trace 2 is formed entirely by the weld section 20S.

[0054] The first and / or second trace 1, 2 may each further comprise a plurality of folds forming different folding zones and a straight portion not shown.

[0055] In this example, the protective section lOp is formed by a punch and therefore comprises a hollow 12e on the first face le and a projection 12i forming the protective surface lOpi opposite the hollow.

[0056] The semi-finished conductive line further comprises a first electrically insulating housing 3 housing at least a portion of the first bending portion 11 of the first trace 1. The first housing 3 is in this example overmolded onto the first bending portion 11 of the first trace 1. In this case, in this example, the first housing 3 comprises an overmolded portion 30 on the protective section 10p on the side of the second face 11 of the first trace 1. This portion of the housing 1 makes it possible to have better resistance of the first trace 1 and thus improves the manufacturing tolerance. Thus, in this example, a first portion of the projection is covered by the overmolded part of the housing 3 and a second part of the projection includes the uncovered protective surface lOpi to be opposite and face the clearance J.

[0057] In this example, the semi-finished conductive line further comprises an aluminum heat sink 5 comprising an opening crossed by the connection portion 10 of the first trace 1 and being fitted with the first housing 3. The conductive line further comprises a thermal and electrically insulating glue located between the heat sink 5 and the second trace 2 to thermally dissipate the second trace 2.

[0058] In this example, the semi-finished conductive line further comprises a second electrically insulating housing 4 (partially shown) fitted with a heat sink 5. In particular, the second electrically insulating housing is a block of an electronic housing of an electrical machine, housing the second trace 2 (which can be inserted into or overmolded by the second housing).

[0059] A second aspect of the invention relates to the manufacture of a line of a semi-finished conductive line according to this first aspect of the invention.

[0060] The method comprises a step of folding a first and second initially planar traces forming the folding portion 11, 21 of respectively the first and second traces 1, 2. The second trace 2 is thus formed and comprises the connection portion forming the weld section while the manufacture of the first trace 1 is not finished, in particular the connection portion 10.

[0061] The method further comprises a step of deforming the first unfinished trace between the first free edge 1s and the folding portion 11 forming the protective section 10p comprising a protective surface 10p1 and thus forming the connection portion 10. The protective surface 10p1 extends inclined relative to a flat surface portion of the second face 11i of the intermediate section 10m of the connection portion 10. This deformation is such that the end of the protective surface 10p1 is located at least 0.6mm away from the flat surface portion of the second face 11i from which it extends. This distance is measured perpendicular to the flat surface portion of the second face 11i of the intermediate section 10m.

[0062] The method further comprises a step of placing the second trace 2 relative to the first trace 1 such that the two parts of the soldering surface 10Si, 20Si are opposite each other with a clearance of less than 0.6 mm.

[0063] In this embodiment, the method further comprises, before the installation step, a step of inserting the first trace into the first housing or overmolding the first housing 3 onto the first trace 1.

[0064] In this example the method further comprises a step of inserting the second trace 2 into the second housing 4 in this case the overmolding of the second housing 4 on the second trace 2 and a step of bonding by an electrically insulating thermal glue a flat surface of the second face 2i of the second trace 2 on a flat surface of the heat sink 5. The positioning step comprises a sub-step of inserting the connection portion 10 through the opening of the heat sink 5 until the heat sink 5 fits into the first housing 3.

[0065] The weld section 10S and the intermediate section 10m have the same section, in particular here the same section as that of the first bending portion 11. The protection section 10p may also have the same section as the weld section 10S and the intermediate section 10m. The protection section 10p may, according to another example, have a different section due to the deformation undergone by punching for example. Preferably, the projection 12i has a width (measured between the two longitudinal edges) identical to or greater than the width of the weld surface portion 10si. This makes it possible to receive all of the beams from a laser device passing through the clearance J shown in [Fig.3].

[0066] In this [Fig.3], representing the semi-finished conductive line in a section identical to that of [Fig.2A], we can see a laser welding device 7 positioned to transmit a laser beam 70 oriented straight and opposite each free edge 1s, 2s. The welding device 7 transforms electrical energy into a laser beam so that the beam is movable relative to the semi-finished conductive line. The beam 70 moves along a plurality of paths from the first free edge 1s to the second free edge 2s and vice versa by crossing the clearance J, the beam 70 is represented schematically at three locations by three arrows.The beam 70 heats at each path between the first and second traces 1, 2, the first trace 1 at the first free edge 1s, the protection section 10p when it crosses the clearance J by radiating on the protection surface 10pi and finally the second trace 2 at the second free edge 2s until at least a part of the weld section 10S, 20S of the first and second traces 1, 2 melts to fuse them. This part of the weld section 10S, 20S extends from the corresponding free edge 1s, 2s to a limited depth. The protection section 10p may have traces of heating on its protection surface 10pi but it does not melt completely to a molten state like the weld section 10S, 20S.

[0067] Another aspect of the invention relates to a method for manufacturing a voltage conductive line from an unfinished conductive line according to the first aspect described above. The method comprises a step of placing a laser welding device 7 to transmit a laser beam 70 oriented at right angles to and opposite each free edge 1s, 2s. The method then comprises a laser welding step in which the welding device 7 transforms electrical energy into a laser beam such that the beam is movable relative to the conductive line. unfinished so that the beam moves along a plurality of paths from the first free edge 1s to the second free edge 2s and vice versa crossing the clearance J. During this welding step, the beam 70 heats on each path (from the first trace to the second trace and vice versa), the first trace 1 at the first free edge 1s, the protection section 10p by heating on the protection surface 10p1 and the second trace 2 at the second free edge 1s. The beam makes as many paths as necessary until at least a part of the weld section 10S, 20 of the first and second traces 1, 2 melts until these two parts melt.

[0068] [Fig.4] represents a conductive line whose welding step is completed. The conductive line is identical to the unfinished one except that it comprises a weld 6 from the first trace 1 to the second trace 2 in place of part or all of the weld section 10S, 20S of the semi-finished conductive line.

[0069] Unless otherwise specified, the same element appearing in different figures has a single reference.

Claims

Claims

1. Semi-finished electrical power conductive line for an electrical machine comprising: - a first electrically conductive trace (1) and a second electrically conductive trace (2) respectively comprising a first and second free edge (1s, 2s), each trace (1, 2) comprising: • a first longitudinal face (1e, 2e) and a second longitudinal face (li, 2i) opposite each other, • a connection portion (10, 20) comprising a weld section (10S, 20S) extending from the free edge (1s, 2s) and comprising a weld surface portion (lOSi, 20Si) of the corresponding second face (li, 2i), facing each other with a clearance J less than 0.6 mm, • a first folding portion (11, 21) extending from the connection portion (10, 20) comprising a fold forming a concave surface on the side of the first face (le, 2e), - characterized in that the connection portion (10) of the first trace (1) comprises, between the welding section (1 OS) and the first folding portion (11, 21), a protection section (lOp) comprising a protection surface (lOpi), opposite the clearance J and extending from a flat surface of the second face (li) of the connection portion (10) to at least one plane P passing in an edge between the second free edge (2s) and the welding surface part (20Si) of the welding section (20S) of the second trace (2), the plane P being parallel to the welding surface part (lOSi) of the first trace (1).

2. Semi-finished conductive line according to the preceding claim, characterized in that the protective section (10p) comprises a hollow (12e) and a projection (12i) forming the protective surface (10pi) opposite the hollow (12e).

3. Semi-finished conductive line according to the preceding claim, characterized in that the first trace (1) comprises a punch forming the projection (12i) and the hollow (12e).

4. Semi-finished conductive line according to one of the preceding claims, characterized in that the protective section (10p) is closer to the first folding portion (11) than to the free edge (1s).

5. Semi-finished conductive line according to one of the preceding claims, characterized in that the free edge (1s) of the first trace (1) and the free edge (2s) of the second trace (2) are each located in a plane parallel to each other at a distance of less than 0.5 mm.

6. Semi-finished conductive line according to one of the preceding claims, comprising a first plastic housing (3), in particular overmolded, at least partially enveloping the first folding portion (11) of the first trace (1) up to the connecting end of the connection portion (10).

7. Semi-finished conductive line according to the preceding claim, in which the first housing (3) comprises a part overmolded on the protective section (10p) on the side of the second face (11i).

8. Semi-finished conductive line according to the preceding claim and one of claims 2 to 3 in which a first part of the projection (12i) is covered by the overmolded part of the housing and a second part of the projection (12i) comprises the protective surface (10pi).

9. Semi-finished conductive line according to claim 7 or 8 above, characterized in that it further comprises: - an aluminum heat sink (5) comprising an opening crossed by the connection portion (11) of the first trace and being fitted with the first housing (3) - a second plastic housing (4) enveloping, for example by overmolding, at least the first folding portion (21) of the second trace (2), the second housing (4) being fixed on the heat sink (5).

10. Semi-finished conductive line according to one of the preceding claims, characterized in that the connection portion (20) of the second trace (2) is formed entirely by the solder section (20S) and in that the first connection portion (10) comprises an intermediate section comprising two flat surfaces each parallel to the plane P extending from the weld section (10S) to the protection section (10p), the two weld sections (10S, 20S) being delimited longitudinally with each other by the clearance J less than 0.6 mm between them.

11. A method of manufacturing a semi-finished conductive line according to one of claims 1 to 10, comprising the steps: - of folding a first and second initially planar trace forming the folding portion (11, 21) of respectively the first and second traces (1, 2), - of deformation of the first trace between a free edge (1s) and the folding portion (11) forming the protection section (10p) comprising the protection surface (10pi), extending in an inclined manner relative to a part of the planar surface (10si) of a second face (li) of the connection portion (10), and - positioning the second trace (2) relative to the first trace (1) so that the two parts of the soldering surface (10Si, 20Si) are opposite each other with a clearance of less than 0.6mm.

12. Method for manufacturing a voltage conductive line from a semi-finished conductive line according to one of claims 1 to 10, characterized in that it comprises the steps: - placement of a laser welding device (7) for transmitting a laser beam (70) oriented straight and opposite the first and second free edges (1s, 2s) of the first and second traces (1, 2) - laser welding in which the welding device (7) transforms electrical energy into a laser beam so that the beam is movable relative to the semi-finished conductive line so that the beam moves along a plurality of paths from the first free edge (1S) to the second free edge (2s) and vice versa while crossing the gap J, the beam (70) heating at each path, the first trace (1) at the first free edge (1S), the protection section (10p) through the gap J and the second trace

13. (2) at the second free edge (1S) until melting the first and second traces (1, 2) of the free edge (10S, 20S) to a limited depth along the trace (1, 2). Electrical power conducting line for an electrical machine comprising: - a first electrically conductive trace (1) and a second electrically conductive trace (2) welded to each other by a welded zone (6) by laser-type fusion connecting the first trace to the second trace, the first trace (1) and the second trace (2) further comprising: • a first longitudinal face (le, 2e) and a second longitudinal face (li, 2i) opposite each other, • a first folding portion (11, 21), comprising a fold forming a concave surface on the side of the first face (1c, 2e), - characterized in that the first trace comprises a connection portion (10) extending between the welded zone (6) and the first folding portion (11), comprising on the side of the second face (li) a protection section (lOp) comprising a protection surface (lOpi) facing the welded zone (6) in a direction parallel to a plane running along a surface of an intermediate section of the connection portion (10) extending from the welded zone (6).

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