Automotive electrical system including a connection panel

Abstract

The electrical system (2) for a motor vehicle (1) comprises: - a housing (3) including a lower wall (6) and a cover (7) fixed to the lower wall so as to delimit an internal volume containing electrical components, the cover (7) including an upper wall (8) and a side skirt (9), the side skirt including a through-connection port (10), - a connection panel (4) extending, in an assembled position, from the through-connection port into the interior of the housing (3), and carrying at least one electrical connection element (13). The connection panel is fixed to the lower wall by means of at least one elastically deformable electrical conduction element (15), the electrical conduction element electrically connecting the electrical connection element to at least one of the electrical components. Figure 3

Description

Title of the invention: Electrical system for a motor vehicle comprising a connection panel. Technical field of the invention

[0001] The invention relates to an electrical system for a motor vehicle, comprising in particular a connection panel and electrical components. The invention also relates to a motor vehicle comprising such an electrical system. The invention further relates to a method for assembling such an electrical system. Technical background

[0002] Electrical systems for motor vehicles, particularly electric battery systems, are known in the prior art. These electrical systems generally comprise a housing containing electrical components, such as battery cells. To facilitate assembly, the components of the electrical system for motor vehicles are mounted on the lower wall of the housing, and then a housing cover is placed over these components and fixed to the lower wall of the housing to create a sealed internal space.

[0003] The electrical components arranged in the housing must generally be electrically connected to other components of the motor vehicle, for example, to supply them with electricity when the electrical system is a battery system. For this purpose, the electrical system typically includes a connection panel arranged at a through-connection opening provided in the wall of the battery housing, for example, in the housing cover. The connection panel includes at least one electrical connection element electrically connected to at least one of the electrical components arranged in the housing. It is thus possible to connect a supplementary electrical connection element to the electrical connection element of the electrical system, so as to electrically connect at least one component of the motor vehicle to at least one of the electrical components included in the housing.

[0004] Since the electrical system housing contains electrical components, it is important to ensure its watertightness, particularly to comply with applicable sealing standards, such as IP67 or IP6K / 9K. The through-hole connection provided in the housing wall to allow connection to other vehicle components forms a potential entry point for external contaminants such as dust or liquid if the interface between the connection panel and the housing cover is not sealed. In theory, the The connection panel arranged in the through-hole is configured to seal the through-hole tightly. However, in practice, assembly imperfections may slightly alter the arrangement of the connection panel relative to the through-hole, but sufficiently so that sealing, particularly against liquids or dust, is not achieved or is not sufficiently achieved to meet applicable electrical system standards. Summary of the invention

[0005] The invention aims in particular to provide an electrical system for motor vehicles which allows for a simple and reliable sealing of the electrical system despite assembly tolerances.

[0006] To this end, the invention relates to an electrical system for a motor vehicle, comprising: - a housing comprising a lower wall and a cover fixed to the lower wall so as to delimit an internal volume comprising electrical components, the cover comprising an upper wall and a side skirt, the side skirt comprising a through-connection port, - a connection panel extending, in an assembled position, from the through connection port into the interior of the housing, and carrying at least one electrical connection element, characterized in that the connection panel is fixed to the lower wall by means of at least one elastically deformable electrical conduction element, the elastically deformable electrical conduction element electrically connecting the electrical connection element and at least one of the electrical components.

[0007] The fact that the connection panel is fixed to the lower wall of the housing by means of at least one elastically deformable electrical conduction element makes it possible to ensure, simply and effectively, a watertight assembly of the electrical system for motor vehicles despite mounting tolerances. In particular, the electrical conduction element allows a certain degree of freedom of movement for the connection panel. This freedom of movement makes it possible to compensate for mounting tolerances when fixing the connection panel to the housing cover, so that the connection panel seals the through-connection hole watertight. Furthermore, this degree of freedom of movement of the connection panel facilitates the assembly of the electrical system. Indeed, during the assembly of the housing, the housing cover is attached to the lower wall, typically by means of a vertical translational movement, from top to bottom.Depending on the shape and dimensions of the lid, this translation of the . The cover may be obstructed by the connection panel. Therefore, the fact that the connection panel is movable allows it to be slightly repositioned to facilitate the vertical movement of the cover and its attachment to the lower wall of the enclosure.

[0008] The fact that the connection panel is attached to the lower wall of the housing via the elastically deformable electrical conduction element, and that this elastically deformable electrical conduction element is electrically connected to the electrical connection element carried by the connection panel, makes it possible to reduce the size inside the housing and the manufacturing cost of the electrical system by reducing the number of parts used. Indeed, the elastically deformable electrical conduction element advantageously fulfills both a support function for the connection panel and an electrical connection function between the electrical connection element and the electrical components present in the housing.

[0009] The expression "a connection panel extending, in an assembled position, from the through-connection port into the interior of the housing" is meant to designate the fact that, in the assembled position, a first end of the connection panel is arranged in the through-connection port or is adjacent to the through-connection port, the rest of the connection panel extending outwards into the interior of the housing.

[0010] The term "elastically deformable electrical conduction element" refers to the fact that the electrical conduction element is configured to be elastically deformed when a force exceeding a predetermined threshold is applied to it and to exert an elastic restoring force in response to this deformation. In particular, the electrical conduction element may be designed to elastically restore the control panel to the assembled position against the side skirt of the housing cover.

[0011] It is understood that the connection panel, and more particularly the electrical connection element, forms a connection interface allowing at least one of the electrical components arranged in the housing to be electrically connected to a component of the motor vehicle, for example in order to supply it with electricity.

[0012] The invention may also include one or more of the following optional features, taken alone or in combination.

[0013] Advantageously, the elastically deformable electrical conduction element comprises at least one elastically deformable busbar. A busbar is also often referred to by the English term "busbar" or by the expression "bus set". A busbar allows two or more components to be electrically connected in a simple and economical way.

[0014] Preferably, the elastically deformable electrical conduction element comprises two busbars. This makes it possible to increase the number of Electrical connections between the electrical connection point and the electrical components of the electrical system. This embodiment is particularly advantageous when the electrical system is a battery system and the electrical components include battery cells. Indeed, in this case, one busbar can be electrically connected to a positive terminal of a battery cell and a second busbar can be electrically connected to a negative terminal of the battery cell.

[0015] Advantageously, the connection panel is movable between its assembled position and a pre-assembled position in which the connection panel extends further into the housing than in the assembled position. This facilitates the assembly of the electrical system. Indeed, before the cover is attached to the lower wall, the connection panel can be moved to a pre-assembled position to facilitate bringing the housing cover closer to the lower wall of the housing without the connection panel obstructing this movement. It is understood that the mobility of the connection panel is made possible by the elastically deformable electrical conduction element.

[0016] Preferably, the electrical conduction element is configured to allow axial and / or angular retraction of the connecting panel between its assembled position and its pre-assembled position. It is thus understood that the electrical conduction element is elastically deformable to allow translation of the connecting panel along an axial retraction stroke and / or to allow rotation of the connecting panel along an angular retraction stroke. Furthermore, the electrical conduction element is, according to embodiments, elastically deformable to allow displacement of the connecting panel comprising a combination of one or more translational movements and one or more rotational movements.

[0017] Preferably, the electrical conduction element is configured to allow an axial retraction stroke of the connection panel of between 0.4 and 11 mm between its assembled and pre-assembled positions. This axial retraction stroke of the connection panel is chosen to be sufficiently large to facilitate the assembly of the housing cover onto the lower wall of the housing, preventing, for example, the cover from rubbing against the connection panel when it is attached to the lower wall of the housing. Furthermore, this axial retraction stroke of the connection panel is chosen to be sufficiently small so as not to exceed the elastic deformation limit of the elastically deformable electrical conduction element.To measure the axial retraction stroke of the connection panel, one can typically take a given point on the connection panel and measure the distance traveled by that point along a principal longitudinal axis of the . electrical system during the transition of the connection panel from the assembled position to the pre-assembled position.

[0018] Preferably, the electrical system further includes means for holding the connection panel in the pre-assembled position. This facilitates the assembly of the electrical system. Indeed, during assembly, it is thus unnecessary to hold the connection panel in the pre-assembled position manually or with the aid of a robotic arm. It is understood that, during assembly, it is possible, firstly, to place the connection panel in the pre-assembled position and hold it in this position using the means for holding the connection panel in the pre-assembled position, then to place the cover of the housing onto the lower wall of the housing, and finally, to release the connection panel from the means for holding the connection panel in the pre-assembled position and place the connection panel in the assembled position.

[0019] Advantageously, the means for retaining the connection panel in the pre-assembled position include clipping means. This is a simple and economical way of retaining the connection panel in the pre-assembled position. For example, the connection panel may include first clipping means, for example a clipping hole, and the housing may include second clipping means, for example a clipping arm, complementary to the first clipping means and designed to cooperate with them so as to retain the connection panel in the pre-assembled position. In other embodiments, the means for retaining the connection panel in the pre-assembled position may not be clipping means, but, for example, any other means allowing reversible retention of the connection panel in the pre-assembled position, such as screw fastening means.

[0020] Advantageously, the connection panel forms a hollow housing having a closed end and an open end facing the side skirt of the housing cover. The open end includes a peripheral edge. A sealing gasket is arranged between the side skirt of the cover and the peripheral edge of the connection panel, around the through-connection port. The sealing gasket improves the sealing of the electrical system housing at the through-connection port. The degree of freedom of movement of the connection panel, permitted by the elastically deformable electrical conduction element, ensures that the sealing gasket is pressed against the side skirt of the housing cover with sufficient pressure to allow the sealing gasket to perform its function. In a particular embodiment, a peripheral groove is formed around the entire circumference of the peripheral edge of the open end of the connection panel, the sealing gasket being housed in the peripheral groove all around the perimeter of the peripheral edge.

[0021] Preferably, the electrical system is an electric battery system and the electrical components are battery cells. According to other embodiments, the electrical system may be any motor vehicle system comprising electrical components, such as, for example, an electrical converter system, for example a DC / DC type electrical converter system.

[0022] The invention also relates to a motor vehicle comprising an electrical system as described above.

[0023] The invention also relates to a method for assembling an electrical system as described above, in which: a) a connection panel is fixed to a lower wall of a housing by means of at least one elastically deformable connecting element, b) the connection panel is moved so as to bring the center of gravity of the connection panel closer to the center of gravity of the lower wall of the housing and to place the connection panel in a pre-assembled position, c) a cover of the housing is brought onto the lower wall of the housing, d) the cover of the housing is fixed to the lower wall of the housing, e) the connection panel is moved towards a through connection hole provided in a side skirt of the cover of the housing, so that the connection panel extends from the through connection hole into the interior of the housing, in an assembled position.

[0024] Thus, the method according to the invention is particularly simple to implement, especially with regard to the step of attaching the housing cover to the lower wall of the housing. Indeed, the fact that the connection panel is in a pre-assembled position reduces the risk that the connection panel will obstruct the movement of the housing cover when it is attached to the lower wall of the housing.

[0025] Advantageously, when the housing cover is attached to the lower wall of the housing, the housing cover moves the connection panel so as to bring the center of gravity of the connection panel closer to the center of gravity of the lower wall of the housing and to place the connection panel in a pre-assembled position, so that steps b) and c) are performed simultaneously. The assembly process is thus faster and simpler. In particular, it does not require any specific intervention from an operator or a robot to move the connection panel and bring it into the pre-assembled position. Depending on the embodiment, the side skirt of the cover can be configured as to form a ramp for the connection panel so that, when the cover is placed on the lower wall of the housing, the connection panel travels along this ramp, which has an incline that causes the connection panel to move progressively towards the pre-assembled position. The angle of inclination of the ramp is, for example, between 10° and 20° with respect to a vertical axis, preferably about 15°. In one embodiment, the elastically deformable electrical conduction element can be provided to elastically return the connection panel to the assembled position so that, once the housing cover is placed on the lower wall of the housing, the connection panel is elastically returned to the assembled position without any further intervention being required. Brief description of the figures

[0026] The invention will be better understood upon reading the following description, given solely by way of non-limiting example and made with reference to the accompanying drawings in which:

[0027] Fig. 1 is a view of a motor vehicle comprising an electrical system for a motor vehicle according to an embodiment of the invention.

[0028] Figure 2 is a perspective view of the electrical system for an automotive vehicle. of the [Fig.l].

[0029] Fig. 3 is a view similar to Fig. 2 in which the cover of the housing of the motor vehicle electrical system is separated from the rest of the electrical system.

[0030] Figure 4 is a perspective view of part of the electrical system for motor vehicle according to the invention in which the cover is not shown.

[0031] Fig. 5 is a top view of the part of the electrical system shown in Fig. 4.

[0032] Fig. 6 is a cross-sectional view of the part of the electrical system shown in Figures 4 and 5.

[0033] Figure 7 is a view similar to Figure 6 in which the connection panel is in pre-assembled position. Detailed description

[0034] Figure 1 shows a motor vehicle 1 according to the invention. The motor vehicle 1 comprises an electrical system 2 according to the invention. In this case, the electrical system 2 is an electric battery system intended to supply electrical energy to the motor vehicle 1, for example for the propulsion of the motor vehicle 1.

[0035] Figures 2 to 7 show the battery system 2 according to the present embodiment. The battery system 2 includes, in particular, a housing 3 comprising electrical components and a connection panel 4. In this case, the electrical system 2 being an electrical battery system 2, the electrical components include in particular battery cells 5.

[0036] The housing 3 comprises a lower wall 6 and a cover 7 fixed to the lower wall 6 so as to delimit an internal volume containing the electrical components, here corresponding to battery cells 5. The lower wall 6 has a general plate shape to which the components, electrical or otherwise, of the battery system 2 are fixed. The cover 7 comprises an upper wall 8 and a side skirt 9. A through-connection hole 10 is provided in the side skirt 9 at one longitudinal end of the cover 7. In this case, the cover 7 is fixed to the lower wall 6 by screwing. According to other embodiments, the cover 7 may be fixed to the lower wall 6 by any other suitable fastening means.

[0037] The connection panel 4, in its assembled position, extends from the through-connection port 10 into the interior of the housing 3. The connection panel 4 has a general bowl shape, thus forming a hollow housing with a closed end and an open end facing the side skirt 9 of the cover 7 of the housing 3, and therefore facing the through-connection port 10 (Figures 3 and 4). The open end of the connection panel 4 includes a peripheral edge 11 having a general shape substantially similar to that of the connection port 10 but with slightly larger dimensions so that, in the assembled position, the peripheral edge 11 of the open end of the connection panel 4 bears against an inner face of the side skirt 9 of the cover 7 of the housing 3 all around the connection port 10.A sealing gasket 12 is arranged between the side skirt 7 and the peripheral edge 11 of the connection panel 4, around the through-connection port 10 ([Fig. 4]). More specifically, the sealing gasket 12 is arranged in a groove formed in the peripheral edge 11 of the connection panel 4 and extending around the entire circumference of this peripheral edge 11. The battery system 2 includes means for attaching the connection panel 4 to the side skirt 9 of the cover 7 of the housing 3. In this case, these attachment means are screw-type. Attachment screws 17 are thus distributed around the entire outer circumference of the connection port 10 ([Fig. 2]). According to other embodiments, any other suitable means of attaching the connection panel 4 to the cover 7 of the housing 3 may be used.

[0038] The connection panel 4 carries at least one electrical connection element 13 intended to be electrically connected to a complementary electrical connection element so as to electrically connect at least one of the electrical components of the battery system 2 to at least one other component of the motor vehicle 1, for example to an electric motor (not shown) of the motor vehicle 1. The connection panel 4 also carries an additional electrical connection element 14 for electrically connecting an electronic control unit 18 of the battery system 2 to an electronic control unit of the motor vehicle 1.

[0039] The connection panel 4 is fixed to the lower wall 6 of the housing 3 by means of at least one elastically deformable electrical conduction element 15. In this case, the elastically deformable electrical conduction element 15 comprises two elastically deformable bus bars 16 (Figures 3 to 7). The bus bars 16 electrically connect the electrical connection element 13 to at least one of the electrical components of the battery system 2. More specifically, in this case, the bus bars 16 electrically connect the electrical connection element 13 to the battery cells 5. It can be envisaged that the electrical conduction element 15 electrically connects the electrical connection element 13 to other electrical components of the battery system 2.

[0040] The fact that the electrical conduction element 15 is elastically deformable allows the connecting panel 4 to be movable between the assembled position, visible in Figures 2 to 6, and a pre-assembled position in which the connecting panel 4 extends further into the housing 3 than in the assembled position, visible in [Fig. 7]. The elastic deformability of the electrical conduction element 15 can be achieved by varying different parameters such as the material used to make this electrical conduction element 15, its structural composition, its shape, and / or its dimensions. These different parameters are also chosen to allow an axial and / or angular retraction stroke of the connecting panel 4 between its assembled position and its pre-assembled position.In this case, the bus bars 16 are each composed of a stack of copper sheets whose thickness and length are chosen to allow the bus bars 16 to be elastically deformable and to allow an axial retraction stroke 19 of the connecting panel 4 of between 0.4 and 11 mm between its assembled and pre-assembled positions. In this case, the bus bars 16 elastically pull the connecting panel 4 in the assembled position against the side skirt 9 of the cover 7 of the housing 3 ([Fig. 6]). To measure the axial retraction stroke 19 of the connecting panel 4, a given point on the connecting panel 4 is typically taken, and the distance traveled by this point along a principal longitudinal axis 20 of the battery system 2 is measured as the connecting panel 4 moves from the assembled to the pre-assembled position ([Fig. 7]).

[0041] According to one embodiment, the electric battery system 2 further comprises means (not shown) for retaining the connection panel 4 in pre-assembled position. Thus, during assembly, it is not necessary to hold the connection panel 4 in the pre-assembled position manually or with a robotic arm. In this case, the means of holding the connection panel 4 in the pre-assembled position are clipping means (not shown). For this purpose, the battery system 2 can be designed to include, inside the housing 3, a clipping arm intended to clip into a clipping hole provided in the connection panel 4 so as to hold it in the pre-assembled position.

[0042] A method for assembling the battery system 2 as described above is described below. According to this method:

[0043] a) A connection panel 4 is attached to a lower wall 6 of a housing 3 via the elastically deformable electrical conduction element 15, that is, in this case, via two elastically deformable bus bars 16. It is therefore understood that the attachment of the connection panel 4 to the lower wall 6 of the housing is indirect. In particular, in this case, the bus bars 16 themselves are not attached directly to the lower wall 6 of the housing 3 but are attached to it via other elements of the battery system 2. At this stage, the battery system 2 is as shown in [Fig. 3].

[0044] b) The connecting panel 4 is moved so as to bring its center of gravity closer to the center of gravity of the lower wall 6 of the housing. In other words, the connecting panel 4 is moved towards what will become the interior of the housing 3 once the cover 7 is attached to the lower wall 6. This movement allows the connecting panel 4 to be placed in the pre-assembled position ([Fig. 7]). According to one embodiment, means for holding the connecting panel 4 in the pre-assembled position, including, for example, clipping means, are used to hold the connecting panel 4 in the pre-assembled position.

[0045] c) The cover 7 of the housing 3 is brought down onto the lower wall 6 of the housing 3. This is achieved by transmitting a movement to the cover 7 positioned above the lower wall 6 of the housing 3, typically a downward vertical translational movement. This transforms a battery system 2 as shown in [Fig. 3] into a battery system 2 as shown in [Fig. 2]. In a particular embodiment, when the cover 7 of the housing 3 is brought down onto the lower wall 6 of the housing 3, the cover 7 of the housing 3 moves the connection panel 4 towards the lower wall 6 of the housing 3, so that steps b) and c) are performed simultaneously. It can be anticipated that the portion of the side skirt 9 of the cover 7, including the connection opening 10, forms a ramp inclined outwards from the housing 3 when traversed from the upper wall 8 of the cover 7 of the housing 3 towards the wall lower 6 of the housing 3. The angle of inclination of the ramp is for example between 10° and 20° with respect to a vertical axis, preferably the angle of inclination is about 15°. This inclination facilitates the movement of the connection panel 4 by friction of an inner face of the side skirt 9 of the cover 7 against the connection panel 4 during the vertical translation of the cover 7 for its placement on the lower wall 6 of the housing 3. After the movement of the cover 7, the electrical system 2 is as shown in [Fig.2].

[0046] d) The cover 7 of the housing 3 is fixed to the lower wall 6 of the housing 3. This fixing can be carried out by any suitable means known to those skilled in the art. In the present case, the cover 7 is fixed to the lower wall 6 by screwing.

[0047] e) The connection panel 4 is moved towards the through connection hole 10 provided in the side skirt 9 of the cover 7 so that the connection panel 4 extends from the connection hole 10 into the interior of the housing 3, in an assembled position ([Fig. 6]). This movement is carried out, for example, manually or using a robotic arm. In the embodiment in which the translation of the cover 7 moves the connection panel 4 so as to bring the center of gravity of the connection panel 4 closer to the center of gravity of the lower wall 6 of the housing 3 and to place the connection panel 4 in a pre-assembled position, the electrical conduction element 15, more particularly the bus bars 16, can be provided to elastically return the configuration panel 4 to the assembled position. The connecting panel 4 is fixed to the side skirt 9 of the cover 7 by any suitable means known to a person skilled in the art.In this case, the connection panel 4 is fixed to the side skirt 9 of the cover 7 by screwing with fixing screws 17 distributed around the entire external perimeter of the connection hole 10 so as to achieve the fixing of the connection panel 4.

[0048] The invention is not limited to the embodiments presented, and other embodiments will be obvious to those skilled in the art. In particular, the electrical system according to the invention is not necessarily an electric battery system but may correspond to any other electrical system for a motor vehicle, such as a DC / DC electric converter system. List of references

[0049] 1: motor vehicle 2: Electrical system for motor vehicles 3: case 4: Connection panel 5: battery cell 6: Lower wall of the case 7: Case cover 8: upper wall of the lid 9: Side skirt of the lid 10: Connection port 11: peripheral edge of the open end of the connection panel 12: Sealing gasket 13: electrical connection device 14: Additional electrical connection component 15: electrical conduction organ 16: omnibus bar 17: fixing screw 18: Electronic control unit 19: Axial retraction stroke 20: main longitudinal axis of the electrical system

Claims

Demands

1. Electrical system (2) for a motor vehicle (1), comprising: - a housing (3) including a lower wall (6) and a cover (7) fixed to the lower wall (6) so as to delimit an internal volume including electrical components, the cover (7) including an upper wall (8) and a side skirt (9), the side skirt (9) including a through connection port (10), - a connection panel (4) extending, in an assembled position, from the through connection port (10) into the interior of the housing (3), and carrying at least one electrical connection member (13), characterized in that the connection panel (4) is fixed to the lower wall (6) by means of at least one elastically deformable electrical conductive member (15), the elastically deformable electrical conductive member (15) electrically connecting the electrical connection member (13) to at least one of the electrical components.

2. Electrical system (2) according to claim 1, wherein the elastically deformable electrical conduction element (15) comprises at least one elastically deformable omnibus bar (16).

3. Electrical system (2) according to claim 2, wherein the elastically deformable electrical conduction element (15) comprises two omnibus bars (16).

4. Electrical system (2) according to any one of the preceding claims, wherein the connecting panel (4) is movable between its assembled position and a pre-assembled position in which the connecting panel (4) extends further into the housing (3) than in the assembled position.

5. Electrical system (2) according to claim 4, wherein the electrical conduction member (15) is configured to permit axial and / or angular retraction stroke of the connecting panel (4) between its assembled position and its pre-assembled position.

6. Electrical system (2) according to claim 5, wherein the electrical conduction member (15) is configured to permit an axial retraction stroke (19) of the connecting panel (4) of between 0.4 and 11 mm between its assembled position and its pre-assembled position.

7. Electrical system (2) according to any one of claims 4 to 6, further comprising means for holding the connection panel (4) in pre-assembled position.

8. Electrical system (2) according to claim 7, wherein the means for retaining the connection panel in pre-assembled position include clipping means.

9. Electrical system (2) according to any one of the preceding claims, wherein the connection panel (4) forms a hollow housing having a closed end and an open end in the direction of the side skirt (9) of the cover (7) of the housing (3), the open end comprising a peripheral edge (11), a sealing gasket (12) being arranged between the side skirt (9) of the cover (7) and the peripheral edge (11) of the connection panel (4), around the through connection port (10).

10. Electrical system (2) according to any one of the preceding claims, wherein the electrical system (2) is an electric battery system (2) and the electrical components are battery cells (5).

11. Motor vehicle (1) comprising an electrical system (2) according to any one of the preceding claims.

12. A method for assembling an electrical system (2) according to any one of claims 1 to 10, wherein: a) a connection panel (4) is fixed to a lower wall (6) of a housing (3) by means of at least one elastically deformable electrically conducting element (15), b) the connection panel (4) is moved so as to bring the center of gravity of the connection panel (4) closer to the center of gravity of the lower wall (6) of the housing (3) and to place the connection panel (4) in a pre-assembled position, c) a cover (7) of the housing (3) is brought onto the lower wall (6) of the housing (3), d) the cover (7) of the housing (3) is fixed to the lower wall (6) of the housing (3), e) the connection panel (4) is moved towards a through connection port (10) formed in a side skirt (9) of the cover (7) of the case (3),so that the connection panel (4) extends from the through connection port (10) into the interior of the housing (3), in an assembled position.

13. Assembly method according to the preceding claim, wherein when the cover (7) of the housing (3) is placed on the lower wall (6) of the housing (3), the cover (7) of the housing (3) moves the connecting panel (4) so ​​as to bring the center of gravity of the connecting panel (4) closer to the center of gravity of the lower wall (6) of the housing (3) and to place the connecting panel (4) in a pre-assembled position so that steps b) and c) are carried out simultaneously.

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