Electrical connection device and method for assembling such an electrical connection device

Abstract

Title: Electrical connection device and method for assembling such an electrical connection device. The invention relates to an electrical connection device (2) having at least one terminal connection element (10) made of copper, the electrical connection device being characterized in that it further comprises a main conductive element (3) made of aluminum, a first intermediate connection element (20) which is rigid and mechanically and electrically attached to one end (7) of the main conductive element made of aluminum, and a second intermediate connection element (30) which is flexible, made of copper and mechanically and electrically attached on one side to the at least one terminal connection element and on the other to the first intermediate connection element. (See Figure 2 for abbreviations.)

Description

Title of the invention: Electrical connection device and method for assembling such an electrical connection device. TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to an electrical connection device.

[0002] The electrical connection device can be used, for example, to electrically interconnect several electrical devices that are physically relatively far apart from each other.

[0003] The electrical connection device can be used in an electrical harness for example in the automotive, aeronautical, or railway sectors.

[0004] The invention further relates to a method of assembling such an electrical connection device. STATE OF THE ART

[0005] Electrical harnesses, for example, used in the automotive field to interconnect several electrical equipment, generally comprise one or more electrical connection devices provided with a first terminal connection element, made of copper, a second terminal connection element, also made of copper and located opposite the first terminal connection element, and a copper electrical cable of a determined length and connected by a first end to the first terminal connection element and by a second end opposite the first end to the second terminal connection element.

[0006] The copper electrical cable is mechanically and electrically secured by crimping with the first terminal connection element and with the second terminal connection element, thus enabling a reliable electrical connection and continuity. Description of the invention

[0007] The present invention relates to an electrical connection device, for a similar application, which is particularly efficient while being convenient and more economical.

[0008] The invention thus relates, according to a first aspect, to an electrical connection device provided with at least one terminal connection element made from copper, the electrical connection device being characterized in that it further comprises a main conductive element made from aluminum, a first intermediate connection element which is rigid and mechanically and electrically attached to one end of the main conductive element made from aluminum, and a second intermediate connecting element which is flexible, made from copper and mechanically and electrically attached on one side to at least one terminal connecting element and to the first intermediate connecting element.

[0009] In the electrical connection device according to the invention, the main conductive element is made of aluminum rather than copper, while at least one terminal connection element made of copper is mechanically attached to a second intermediate flexible connection element, also made of copper. It is therefore the first intermediate connection element that provides the mechanical and electrical connection between the main conductive element made of aluminum and at least one terminal connection element made of copper, via the second intermediate flexible connection element, also made of copper.

[0010] In other words, the mechanical and electrical interconnection of the main conductive element made from aluminium and at least one terminal connection element made from copper is ensured by two separate intermediate connection elements, one being rigid to ensure electrical continuity between two different materials and the other being flexible to allow for the handling of at least one terminal connection element and thus to interconnect it for example with electrical equipment regardless of the positioning of the latter.

[0011] Preferred, simple, convenient and economical characteristics of the electrical connection device according to the invention are presented below.

[0012] The main conductive element made from aluminium has a length much greater than that of the first intermediate connecting element which is rigid and that of the second intermediate connecting element which is flexible and made from copper.

[0013] The second intermediate connecting element, which is flexible and made from copper, is an insulated electrical cable with a length much shorter than that of the main conducting element made from aluminum.

[0014] The terminal connection member made from copper is a terminal lug having a terminal portion configured to receive a first intermediate end stripped of the second intermediate connection member, a flat terminal portion configured to cooperate with a predetermined electrical terminal and a terminal transition portion connecting the flat terminal portion to the terminal portion.

[0015] The terminal portion can be a tubular or partially tubular portion, that is to say at least partially open and configured to be closed.

[0016] The first intermediate connecting element is made of copper.

[0017] The first intermediate connecting member is an intermediate lug having an intermediate tubular portion configured to receive a second intermediate end stripped of the second intermediate connecting member, an intermediate flat portion configured to cooperate with the end of the main conducting member made from aluminum, and an intermediate transition portion connecting the intermediate flat portion to the intermediate tubular portion.

[0018] The main conductive element is formed by an insulated electrical cable which is flexible and, for example, provided with a plurality of strands, or by a connecting bar which is rigid, of the bus-bar type.

[0019] The main conductive element made from aluminium has a flattened end.

[0020] The flattened end of the main conducting element made from aluminum is welded with the intermediate flat portion of the first intermediate connecting element.

[0021] The flattened end of the main conducting element made from aluminium and the intermediate flat portion of the first intermediate connecting element are welded for example by ultrasound.

[0022] The intermediate flat portion of the first intermediate connecting member has a receiving area for the flattened end of the main conducting member made from aluminum, and at least one barrier area formed in a recess and adjacent to the receiving area.

[0023] The intermediate flat portion of the first intermediate connecting member has a free edge in fillet, on the side of the flattened end of the main conducting member made from aluminium.

[0024] The first intermediate connecting element has an anti-corrosion coating, for example made from nickel.

[0025] The intermediate flat portion of the first intermediate connecting member has a width and a length respectively of approximately 17 mm and 19 mm, 20 mm and 22 mm, 23 mm and 25 mm, 26 mm and 28 mm, 28 mm and 30 mm, and 31 mm and 32 mm, to receive, in particular, a flattened end, of the main conducting member made from aluminium having a cross-section respectively between approximately 25 mm2 and 50 mm2, 40 mm2 and 70 mm2, 50 mm2 and 95 mm2, 70 mm2 and 120 mm2, 95 mm2 and 150 mm2, and 120 mm2 and 185 mm2.

[0026] The first intermediate connecting member is made from a tube having a small diameter and a large diameter, respectively of approximately 8.5 mm and 12 mm, 10 mm and 14 mm, 12 mm and 16.5 mm, 13.5 mm and 18 mm, 15 mm and 19.5 mm, and 16.5 mm and 21 mm, to receive an intermediate end of the second intermediate member having a cross-section of approximately 16 mm² and 25 mm2, 25 mm2 and 40 mm2, 40 mm2 and 50 mm2, 50 mm2 and 70 mm2, 70 mm2 and 95 mm2, and 95 mm2 and 120 mm2.

[0027] The electrical connection device is further provided with at least one protective sleeve disposed at least partially around the first intermediate connection member.

[0028] The invention also relates, according to a second aspect, to an electrical harness comprising an electrical connection device as described above, configured to equip a land vehicle, an aircraft, or a railway system.

[0029] The invention also relates, according to a third aspect, to a method of assembling an electrical connection device as described above, comprising the steps of providing: at least one terminal connection element made from copper, a main conductive element made from aluminum, a first intermediate connection element which is rigid, and a second intermediate connection element which is flexible and made from copper;to mechanically and electrically connect: one end of the main conductive element made from aluminum to the first intermediate connecting element, a first bare intermediate end of the second intermediate connecting element which is flexible to at least one terminal connecting element, and a second bare intermediate end of the second intermediate connecting element which is flexible, opposite its first bare intermediate end, to the first intermediate connecting element, opposite the end of the main conductive element made from aluminum. BRIEF DESCRIPTION OF THE FIGURES

[0030] The invention, according to an exemplary embodiment, will be well understood and its advantages will become more apparent upon reading the following detailed description, given by way of example and not limiting in any way, with reference to the attached drawings.

[0031] Fig. 1 schematically represents an electrical harness comprising an electrical connection device according to the invention, configured to equip a land vehicle, an aircraft, or a railway system.

[0032] [Fig.2] partially represents in front view the electrical connection device of [Fig.1].

[0033] Fig. 3 represents a top view of the electrical connection device visible in Fig. 2.

[0034] Fig. 4 is a perspective view of the electrical connection device visible in Figures 2 and 3.

[0035] Fig. 5 shows a detail of the electrical connection device visible in figures 2 to 4.

[0036] Fig. 6 is a front view of a first intermediate connecting element of the electrical connection device, taken in isolation.

[0037] Fig. 7 is a top view of the first intermediate connecting member visible in Fig. 6.

[0038] Figures 8, 9, 10 and 11 show in isolated perspective the first intermediate connecting organ visible in Figures 6 and 7, from different angles of view.

[0039] Figures 12, 13 and 14 show in isolated perspective variants of embodiment of the first intermediate connecting member of the electrical connection device.

[0040] Fig. 15 is a view similar to Fig. 4, showing an alternative embodiment of the electrical connection device.

[0041] Fig. 16 is a similar view to Fig. 15, showing the variant embodiment of the electrical connection device in a different arrangement. DETAILED DESCRIPTION

[0042] Fig. 1 schematically represents an electrical harness 1 configured to equip, for example, a land vehicle, an aircraft, or a railway system.

[0043] The electrical harness 1 is, for example, intended to electrically interconnect electrical equipment (not shown) which is physically relatively far apart from each other.

[0044] The electrical bundle 1 is here formed by an electrical connection device 2 provided in particular with a main conductive element formed here by a main electrical cable 3 which is insulated and made from aluminum, and two connection terminations 4 at the ends 5 of the electrical bundle 1.

[0045] Alternatively, the main conductive element can be a bus-bar type connection bar.

[0046] Fig. 1 shows that the main electrical cable 3 is the element with the greatest length of the electrical connection device 2, in particular with regard to the two connection terminations 4.

[0047] Figures 2 to 5 show in more detail the electrical connection device 2 of [Fig.1], on the side of only one of the two connection terminations 5, knowing that in the embodiment shown, the other of the two connection terminations 5 is identical to that shown.

[0048] The main electrical cable 3, which is insulated and made from aluminum, here comprises a plurality of strands 6 and a bare end 7 which is flattened and thus defines an electrical contact surface 8.

[0049] The connection termination 5 of the electrical connection device 2 is provided with a terminal connection member 10, a first intermediate member of connection 20 mechanically and electrically attached to the bare end 7 of the main electrical cable 3, and to a second intermediate connecting element 30 which is flexible, made from copper and mechanically and electrically attached on one side to at least one terminal connecting element 10 and to the first intermediate connecting element 20.

[0050] The terminal connecting member 10 is here rigid and made from copper, the first intermediate connecting member 20 is rigid and also made from copper, and the second intermediate connecting member 30 is flexible and also made from copper.

[0051] The terminal connecting member 10 is here formed by a terminal lug 11 having a terminal portion 12, a flat terminal portion 13 and a terminal transition portion 14 connecting the flat terminal portion 13 to the terminal portion 12.

[0052] In the illustrated example, the terminal portion 12 is tubular.

[0053] Alternatively, the terminal portion may be partially tubular, i.e. at least partially open.

[0054] The terminal connection member 10 can be made from a cylindrical tube.

[0055] The second intermediate connecting member 30 is formed by an insulated electrical cable 31 having a first intermediate bare end 32 and a second intermediate bare end 33 opposite the first intermediate bare end 32.

[0056] The second intermediate connecting element 30 has a length much shorter than that of the main electrical cable 3.

[0057] In other words, the main electrical cable 3, which is insulated and made from aluminum, has a length much greater than that of the first intermediate connecting element 20, which is rigid, and that of the second intermediate connecting element 30, which is flexible.

[0058] The terminal portion 12 of the terminal connecting member 10 is configured to receive, through a terminal introduction opening, the first bare intermediate end 32 of the second intermediate connecting member 30.

[0059] The mechanical and electrical connection between the terminal connecting member 10 and the second intermediate connecting member 30 can be achieved by crimping the first bare intermediate end 32 with the terminal portion 12.

[0060] The flat terminal portion 13 here has a mounting hole 15 and is configured to cooperate with a predetermined electrical terminal (not shown) for example of one of the electrical equipment.

[0061] The first intermediate connecting member 20 is formed by an intermediate lug 21 having an intermediate tubular portion 22, a flat portion intermediate 23 and an intermediate transition portion 24 connecting the intermediate flat portion 23 to the intermediate tubular portion 22.

[0062] The intermediate tubular portion 22 is configured to receive, through an intermediate introduction opening 25 (visible [Fig.8]), the second intermediate bare end 33 of the second intermediate connecting member 30.

[0063] The mechanical and electrical connection between the first intermediate connecting element 20 and the second intermediate connecting element 30 can be achieved by crimping the second bare intermediate end 33 with the intermediate tubular portion 22.

[0064] The intermediate flat portion 23 is configured to cooperate with the stripped end 7 which is flattened of the main electrical cable 3 which is insulated and made from aluminum.

[0065] The mechanical and electrical connection between the first intermediate connecting element 20 and the main electrical cable 3 can be made for example by welding, in particular by ultrasonic welding, of the intermediate flat portion 23 with the stripped end 7 which is flattened.

[0066] As can be seen more clearly in Figures 6 to 11, the first intermediate connecting member 20 can be made from a cylindrical tube.

[0067] It is possible to propose a range of first intermediate connection elements, to be selected according to a section of the main electrical cable 3 which is insulated and made from aluminium.

[0068] In particular, the intermediate flat portion 23 of the first intermediate connecting member 20 may have a width of about 17 mm and a length of about 19 mm, to receive the flattened bare end 7 of a main electrical cable 3 having a cross-section between about 25 mm2 and about 50 mm2.

[0069] Furthermore, the first intermediate connecting member 20 can be made from a tube having a small diameter of about 8.5 mm and a large diameter of about 12 mm, so as to receive the second stripped intermediate end 33 of the second intermediate connecting member 30 having a cross-section between about 16 mm2 and about 25 mm2.

[0070] In the range, the intermediate flat portion 23 of the first intermediate connecting member 20 may have a width of approximately 20 mm and a length of approximately 22 mm, to receive a main electrical cable 3 having a cross-section of between approximately 40 mm² and approximately 70 mm². Furthermore, the first intermediate connecting member 20 may be made from a tube having a small diameter of approximately 10 mm and a large diameter of approximately 14 mm, so as to receive the second stripped intermediate end 33 of the second intermediate connecting member 30 having a cross-section of between approximately 25 mm² and approximately 40 mm².

[0071] In the range, the intermediate flat portion 23 of the first intermediate connecting member 20 may have a width of approximately 23 mm and a length of approximately 25 mm, to receive a main electrical cable 3 having a cross-section of between approximately 50 mm² and approximately 95 mm². In addition, the first intermediate connecting member 20 may be made from a tube having a small diameter of approximately 12 mm and a large diameter of approximately 16.5 mm, so as to receive the second stripped intermediate end 33 of the second intermediate connecting member 30 having a cross-section of between approximately 40 mm² and approximately 50 mm².

[0072] In the range, the intermediate flat portion 23 of the first intermediate connecting member 20 may have a width of approximately 26 mm and a length of approximately 28 mm, to receive a main electrical cable 3 having a cross-section of between approximately 70 mm² and approximately 120 mm². In addition, the first intermediate connecting member 20 may be made from a tube having a small diameter of approximately 13.5 mm and a large diameter of approximately 18 mm, so as to receive the second stripped intermediate end 33 of the second intermediate connecting member 30 having a cross-section of between approximately 50 mm² and approximately 70 mm².

[0073] In the range, the intermediate flat portion 23 of the first intermediate connecting member 20 may have a width of approximately 28 mm and a length of approximately 30 mm, to receive a main electrical cable 3 having a cross-section of between approximately 95 mm² and approximately 150 mm². Furthermore, the first intermediate connecting member 20 may be made from a tube having a small diameter of approximately 15 mm and a large diameter of approximately 19.5 mm, so as to receive the second stripped intermediate end 33 of the second intermediate connecting member 30 having a cross-section of between approximately 70 mm² and approximately 95 mm².

[0074] In the range, the intermediate flat portion 23 of the first intermediate connecting member 20 may have a width of approximately 31 mm and a length of approximately 32 mm, to receive a main electrical cable 3 having a cross-section between approximately 120 mm² and approximately 185 mm². Furthermore, the first intermediate connecting member 20 may be made from a tube having a small diameter of approximately 16.5 mm and a large diameter of approximately 21 mm, so as to receive the second stripped intermediate end 33 of the second intermediate connecting member 30 having a cross-section between approximately 95 mm² and approximately 120 mm².

[0075] The intermediate flat portion 23 of the first intermediate connecting member 20 here presents a receiving area 26 which is flattened and which is configured to receive the stripped end 7 which is flattened of the main insulated electrical cable 3.

[0076] The receiving area 26 has a complementary contact surface at least equal to the contact surface 8 of the bare end 7 which is flattened of the main insulated electrical cable 3, which contact surface 8 comes to apply itself to the complementary contact surface.

[0077] The intermediate flat portion 23 of the first intermediate connecting member 20 further has a free edge 27 in fillet, on the side where the bare end 7 which is flattened of the main electrical cable 3 is received.

[0078] The free edge 27 may for example have a radius between approximately 1 mm and 3 mm.

[0079] The free edge 27 can be used to protect the strands of the main electrical cable 3 during mechanical and electrical fastening by welding.

[0080] The free edge 27 can also improve the seal between the main electrical cable 3 and the first intermediate connection member 20 at the level of its intermediate flat portion 23.

[0081] The first intermediate connecting member 20 may further include a fillet 28 provided at a junction between the intermediate flat portion 23 and the intermediate transition portion 24.

[0082] It should be noted that the first intermediate connecting element 20 may also have an anti-corrosion coating made, for example, from nickel.

[0083] This may be, for example, a so-called nickel sulfamate coating, and / or medium chemical nickel phosphorus, and / or medium chemical nickel phosphorus.

[0084] As an alternative or in addition, the tube enabling the first intermediate connection element 20 to be made can be passivated.

[0085] Figures 12 to 14 show alternative embodiments where the first intermediate connecting member 30 is further provided with barrier zones 29 set in recesses in the intermediate flat portion 23.

[0086] The barrier zones 29 are arranged so as to be adjacent to the receiving zone 26, on the side of the fillet 28 arranged at the junction between the intermediate flat portion 23 and the intermediate transition portion 24, opposite the free edge 27 in fillet.

[0087] In particular, on [Fig. 12], two barrier zones 29 in the form of distinct notches are provided on lateral edges of the intermediate flat portion 23.

[0088] On [Fig. 13], a single barrier zone 29 in the form of a transverse notch extends between the lateral edges of the intermediate flat portion 23.

[0089] On [Fig. 14], two barrier zones 29 in the form of distinct transverse notches extend between the lateral edges of the intermediate flat portion 23.

[0090] These barrier zones 29 are configured to prevent and / or limit water infiltration into the first intermediate connecting element 30.

[0091] We will now describe a method of assembling the electrical connection device 2 as described above to form at least one of the two connection terminations 4 of the electrical harness 1.

[0092] The method comprises the steps of providing: at least one terminal connection member 10 made from copper; a main electrical cable 3 which is insulated and made from aluminum; at least one first intermediate connection member 20 which is rigid; and at least one second intermediate connection member 30 which is flexible and made from copper.

[0093] The method further comprises the steps of mechanically and electrically attaching: the bare end 7 of the main electrical cable 3 to the first intermediate connecting member 20; a first intermediate end 32 of the second intermediate connecting member 30 to at least one terminal connecting member 10, and a second intermediate end 33 of the second intermediate connecting member 30, opposite its first intermediate end 32, to the first intermediate connecting member 20, opposite the bare end 7 of the main electrical cable 3.

[0094] It will be noted that the assembly process depends on the different elements or sub-assemblies of the electrical harness 1 which are supplied, that a sub-assembly may include the terminal connection element 10 with the second intermediate connection element 30, or even also with the first intermediate connection element 20, or the second intermediate connection element 30 with the first intermediate connection element 20, or even also with the main electrical cable 3, or the first intermediate connection element 20 with the main electrical cable 3.

[0095] It will also be noted that the assembly method may further include the step of providing and arranging one or more protective sleeves (not shown) at least partially around the first intermediate connecting member 20 so as to cover the first intermediate connecting member 20, the bare end 7 of the main electrical cable 3 and also the second intermediate end 33 of the second intermediate connecting member 30; or even partially around the terminal connecting member 10 so as to cover a part of this terminal connecting member 10 as well as the first intermediate end 32 of the second intermediate connecting member 30; or even a major part of the connection termination 5, from the bare end 7 of the main electrical cable 3 up to and including at least partially the terminal connecting member 10.

[0096] Fig. 15 is a similar view to Fig. 4, showing an alternative embodiment of the electrical connection device 2, where the main electrical cable 3 is replaced by a bus-bar type connection bar 103.

[0097] The connection termination 5 formed by the terminal connection element 10, the second intermediate connection element 30 and the first intermediate connection element 20, is identical to that described above with reference in particular to figures 1 to 5.

[0098] The bus-bar type connection bar 103 is not isolated.

[0099] The bus-bar type connection bar 103 is made from aluminium.

[0100] The bus-bar type connection bar 103 has a main section 140 and a end 107 flat, or flattened, which is connected to the main section 140 by an intermediate section 145 here bent.

[0101] Alternatively, the intermediate section 145 could be straight rather than angled.

[0102] The flat or flattened end 107 of the bus-bar type connecting bar 103 is welded here onto the intermediate flat portion 23 of the first intermediate connecting member 20, thus forming an electrical contact surface 108.

[0103] On [Fig. 15], the bus-bar type connecting bar 103 is mechanically secured to the connecting termination 5 so as to extend globally longitudinally in a direction similar to that of the connecting termination 5.

[0104] Fig. 16 is a similar view to Fig. 15, showing the variant embodiment of the electrical connection device 2 in a different arrangement, where the bus-bar type connection bar 103 is mechanically secured to the connection termination 5 so as to extend globally perpendicular to the extension direction of the connection termination 5.

[0105] The connection termination 5 formed by the terminal connection element 10, the second intermediate connection element 30 and the first intermediate connection element 20, is also identical to that described above with reference in particular to figures 1 to 5.

[0106] The bus-bar type connecting bar 103 is not insulated, it is made from aluminium, and it has a main section 140 and a flat, or flattened, end 107, which is connected to the main section 140 by an intermediate section 145 here bent; with the flat or flattened end 107 of the bus-bar type connecting bar 103 which is welded to the intermediate flat portion 23 of the first intermediate connecting member 20, thus forming an electrical contact surface 108.

[0107] In the electrical connection device 2 as described above, the main electrical cable 3 and / or the busbar 103 are made of aluminum rather than copper, while the copper terminal connection 10 is mechanically attached to the second intermediate connection 30, which is flexible and also made of copper. It is therefore the first intermediate connection 20 that provides the mechanical and electrical connection between the main electrical cable 3 and / or the bus-bar type connection bar 103 and the terminal connection element 10 made from copper, via the second intermediate connection element 30.

[0108] In other words, the mechanical and electrical interconnection between the main electrical cable 3 and / or the bus-bar type connection bar 103, which are made from aluminium, and the terminal connection element 10, which is made from copper, is ensured by two separate intermediate connection elements, one being rigid to ensure electrical continuity between two different materials and the other being flexible to allow for the handling of at least one terminal connection element and thus to interconnect it, for example, with electrical equipment regardless of the positioning of the latter.

[0109] When reference is made in this document to an element made from copper, this means that it is made of copper or a copper alloy, in particular brass.

[0110] In an unillustrated variant, the first intermediate connecting element is not made from copper, but rather from aluminium.

[0111] More generally, the invention is not limited to the examples described and represented.

Claims

Demands

1. Electrical connection device having at least one terminal connection member (10) made from copper, the electrical connection device (2) being characterized in that it further comprises a main conductive member (3, 103) made from aluminium, a first intermediate connection member (20) which is rigid and mechanically and electrically attached to one end (7, 107) of the main conductive member (3, 103) made from aluminium, and a second intermediate connection member (30) which is flexible, made from copper and mechanically and electrically attached on one side to the at least one terminal connection member (10) and to the first intermediate connection member (20).

2. Electrical connection device according to claim 1, characterized in that the main conductive element (3, 103) made from aluminium has a length greater than that of the first intermediate connection element (20) which is rigid and that of the second intermediate connection element (30) which is flexible and made from copper.

3. Electrical connection device according to any one of claims 1 and 2, characterized in that the second intermediate connection member (30) which is flexible and made from copper is an insulated electrical cable.

4. Electrical connection device according to claim 3, characterized in that the terminal connection member (10) made from copper is a terminal lug having a terminal portion (12) configured to receive a first intermediate stripped end (32) of the second intermediate connection member (30), a flat terminal portion (13) configured to cooperate with a predetermined electrical terminal and a terminal transition portion (14) connecting the flat terminal portion (13) to the terminal portion (12).

5. Electrical connection device according to any one of claims 3 and 4, characterized in that the first intermediate connection member (20) is an intermediate lug having an intermediate tubular portion (22) configured to receive a second intermediate bare end (33) of the second intermediate member of connection (30), an intermediate flat portion (23) configured to cooperate with the end (7, 107) of the main conducting member (3, 103) made from aluminium, and an intermediate transition portion (24) connecting the intermediate flat portion (23) to the intermediate tubular portion (22).

6. Electrical connection device according to claim 5, characterized in that the main conductive element (3, 103) is formed by an insulated electrical cable which is flexible and for example provided with a plurality of strands, or by a connecting bar which is rigid, of the bus-bar type, and its end (7, 107) is flattened.

7. Electrical connection device according to claim 6, characterized in that the flattened end (7, 107) of the main conductive member (3, 103) made from aluminium is welded with the intermediate flat portion (23) of the first intermediate connecting member (20).

8. Electrical connection device according to any one of claims 6 and 7, characterized in that the flattened end (7, 107) of the main conductive member (3, 103) made from aluminium and the intermediate flat portion (23) of the first intermediate connecting member (20) are ultrasonically welded.

9. Electrical connection device according to any one of claims 6 to 8, characterized in that the intermediate flat portion (23) of the first intermediate connection member (20) has a receiving area (26) for the flattened end (7, 107) of the main conducting member (3, 103) made from aluminium, and at least one barrier area (29) formed in a recess and adjacent to the receiving area.

10. Electrical connection device according to any one of claims 6 to 9, characterized in that the intermediate flat portion (23) of the first intermediate connection member (20) has a free edge in fillet (27), on the side of the flattened end (7, 107) of the main conductive member (3, 103) made from aluminium.

11. An electrical connection device according to any one of claims 5 to 10, characterized in that the intermediate flat portion (23) of the first intermediate connecting member (20) has a width and a length of 17 mm and 19 mm, 20 mm and 22 mm, 23 mm and 25 mm, 26 mm and 28 mm, from 28 mm to 30 mm, and from 31 mm and 32 mm, to receive the end (7, 107) of the main conducting element (3, 103) made from aluminium having a cross-section between 25 mm2 and 50 mm2, 40 mm2 and 70 mm2, 50 mm2 and 95 mm2, 70 mm2 and 120 mm2, 95 mm2 and 150 mm2, and 120 mm2 and 185 mm2 respectively.

12. Electrical connection device according to claim 11, characterized in that the first intermediate connection member (20) is made from a tube having a small diameter and a large diameter of 8.5 mm and 12 mm, 10 mm and 14 mm, 12 mm and 16.5 mm, 13.5 mm and 18 mm, 15 mm and 19.5 mm, and 16.5 mm and 21 mm respectively, so as to receive the second stripped intermediate end (33) of the second intermediate connection member (30) having a cross-section between 16 mm2 and 25 mm2, 25 mm2 and 40 mm2, 40 mm2 and 50 mm2, 50 mm2 and 70 mm2, 70 mm2 and 95 mm2, and 95 mm2 and 120 mm2 respectively.

13. Electrical connection device according to any one of claims 1 to 12, characterized in that the electrical connection device (2) is further provided with at least one protective sleeve disposed at least partially around the first intermediate connection member (20).

14. Electrical connection device according to any one of claims 1 to 13, characterized in that the first intermediate connection member (20) is made from copper.

15. Electrical connection device according to any one of claims 1 to 14, characterized in that the first intermediate connection member (20) has an anti-corrosion coating.

16. Electrical harness comprising an electrical connection device (2) according to any one of claims 1 to 15, configured to equip a land vehicle, an aircraft, or a railway system.

17. Method of assembling an electrical connection device according to any one of claims 1 to 15, comprising the steps of providing: at least one terminal connection member (10) made from copper, a main conductive member (3, 103) made from aluminum, a first intermediate connection member (20) which is rigid, and a second intermediate connection member (30) which is flexible, made from copper; to mechanically and electrically attach: one end (7, 107) of the main conductive element (3, 103) made from aluminum to the first intermediate connecting element (20), a first intermediate bare end (32) of the second intermediate connecting element (30) which is flexible to at least one terminal connecting element (10), and a second intermediate bare end (33) of the second intermediate connecting element (30) which is flexible, opposite its first intermediate bare end (32), to the first intermediate connecting element (20), opposite the end (7, 107) of the main conductive element (3, 103) made from aluminum.

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