Bi-material casing of an electronic device

Abstract

Title of the invention: Bi-material housing for an electronic device. Housing (2) of an electronic device comprising at least one wall (6), contributing to defining a housing for electronic components of said device, and at least one electrical connector (4) attached to said wall (6) and comprising a sleeve (14) projecting from said wall (6) and dimensioned to house electrical connection elements (18), characterized in that the sleeve (14) of the at least one connector (4) and at least a portion of the wall (6) form a single unit and are made of two different plastic materials (MP1, MP2). [Fig.2]

Description

Title of the invention: Bi-material housing of an electronic device

[0001] The present invention relates to the field of electronic devices, and in particular to electronic devices equipping motor vehicles.

[0002] Electronic devices can take various forms, particularly in applications to modern motor vehicles, which are largely electrified and, where applicable, use high-voltage power supplies, such as those on the order of 800V. Specifically, electronic devices can be used to convert the electrical power from a charging station or a household outlet into direct current, which can be stored in a vehicle battery and / or power electrical machines onboard the vehicle. These electronic devices can, for example, take the form of converters.

[0003] Generally, an electronic device comprises a housing and a plurality of electronic components housed within the housing. The housing contributes to the protection of the electronic components, and it is necessary to provide at least some electrical connection elements passing through the housing so that current can be supplied to the electronic components housed within the housing, these electrical connection elements being arranged within a connector in the form of a sheath capable of electrically isolating the connection elements and sized to cooperate with an electrical connection socket.

[0004] The design of the enclosure must take into account several parameters, in addition to the dimensions required to house all the electronic components of the device as compactly as possible. In particular, electromagnetic compatibility must be considered, that is, the enclosure's ability to prevent electromagnetic interference from entering or leaving the enclosure. Rigidity must also be considered, that is, the enclosure's ability to withstand potential shocks without deforming in order to protect the electronic components. Furthermore, sealing is also essential, both to protect the electronic components and to protect users, particularly at the junction between the enclosure and the power connector.Finally, although this list is not exhaustive of what should be considered for the design of the casing, the question of the weight of the electronic device, and therefore of its casing, is particularly important for reasons related to a desired reduction in the carbon footprint of the electronic device.

[0005] In particular, with regard to this reduction of the carbon footprint, it is known to use a plastic material to manufacture all or part of a vehicle part automotive. It is also advisable to limit the number of parts required to make this part, in particular by reducing the number of fixing screws, glue beads or weld beads that are needed for its proper execution.

[0006] The choice of an appropriate material is made difficult in the manufacture of an electronic device due to the various functions which are implemented within this electronic device, namely the function of protecting the frame of the housing, the function of transmitting the electrical current carried out by the connector, with a connector which can be of the high voltage type and a connector which can be of the control signal transmission type.

[0007] Housings made of aluminum and onto which plastic connectors are screwed are known. This allows one to benefit, on the one hand, from the rigidity of the metallic material and its properties capable of forming a Faraday cage containing electromagnetic interference, and on the other hand, from the lightness and electrical insulation capabilities of plastic. However, this is not considered satisfactory here, particularly from the point of view of the overall weight of the electronic device and therefore its carbon footprint, and also from the point of view of the sealing at the screw connection of the plastic connector to the aluminum housing.

[0008] In this context, the present invention aims to offer an alternative to existing electronic devices by proposing in particular a housing for an electronic device comprising at least one wall, helping to delimit a housing for electronic components of said device, and at least one electrical connector linked to said wall and which includes a sleeve protruding from said wall and sized to house electrical connection elements, characterized in that the sleeve of at least one connector and at least part of the wall form a single unit and are made of two different plastic materials.

[0009] An electronic device forming an aspect of the invention may be an alternating current / direct current converter, an inverter or any other type of device provided that it includes a housing according to the invention, that is to say a housing advantageous in that it includes a connector made in one piece with the wall of the housing which carries it, but by using two different materials, these materials being chosen for the possibility that they offer of making the housing in one piece, for the ability to electrically insulate the housing effectively, and for the reduction of the carbon footprint that they help to achieve.

[0010] More particularly, according to the invention, a first plastic material is intended to form at least part of the wall, and more generally the other walls participating in the formation of the casing, whether they be side walls or the bottom wall. And a second plastic material is intended to form at least the sheath of the The connector, which protrudes from the wall, extends outwards from the housing. These plastics differ primarily in their mechanical properties, but both are compatible, allowing for good adhesion between them to create a single, seamless assembly. The rigidity and electromagnetic shielding required for the housing to protect the electronic components are provided by the first plastic, while the electrical insulation required in the connector area is provided by the second plastic.

[0011] Specific electrical insulation, i.e. with a material recognized for its electrical insulation properties, is necessary here because the connector surrounds electrical connection elements which can allow a high voltage current supply, for example on the order of 800V.

[0012] The housing according to the invention is made in one piece, such that the connector and the wall that supports this connector form a single unit. A single unit means that the connector and the wall to which the connector is attached are inseparable once the housing is manufactured, unless one or both are broken. It is noteworthy that this arrangement means that no fixing screws are provided between the housing and the connector to secure the latter's position. In this context, it is not necessary to provide sealing means at the junction of the connector and the housing frame.

[0013] According to one feature of the invention, the casing is obtained by injection of the two plastic materials.

[0014] According to a feature of the invention, a junction zone is defined by the meeting of the two different plastic materials, in the plane of the wall to which the connector is attached.

[0015] It should be noted here that the junction zone is defined as an area in which the two injected plastics mix. This junction zone does not consist of a flat junction surface with clearly defined contours. This junction zone is defined by the arrival in the same area of ​​two different plastics, injected from different injection points and flowing into this junction zone in opposite directions, so that the junction zone is heterogeneous with a mixture of the plastics and in any case a demarcation between the two plastics that is not flat.

[0016] According to one feature of the invention, the junction zone between the two plastic materials is in the vicinity of the sleeve. More particularly, the junction zone extends in the plane of the wall to which the connector is attached, surrounding the sleeve.

[0017] According to one feature of the invention, the housing comprises a plate extending perpendicularly, or substantially perpendicularly, to the sheath, said plate extending in continuity with the wall, said plate being made of the same plastic material as the sheath.

[0018] The plate contributes to forming part of the wall to which the connector is attached. This ensures that the junction area is in the plane of the side wall, which on the one hand ensures, when considering the manufacturing process, that the two plastic materials flow in the same direction at the time of joining, which facilitates their cohesion, and on the other hand ensures, when considering the finished product, that the connector sleeve, which a user is able to touch, is entirely made of the plastic material intended to effectively provide electrical insulation.

[0019] According to one feature of the invention, the plate has a thickness equal to the thickness of said wall, the plate extending substantially in the same plane as said wall.

[0020] The mounting plate contributes to forming the wall to which the connector is attached, and no local difference in thickness is observed, which helps to secure the connector within the housing. The continuity of the mounting plate and the wall in the same plane can be seen, in particular, by the fact that at the junction of the two plastic materials, an inner face of the wall extends in continuity with an inner face of the mounting plate, and an outer face of the wall extends in continuity with an outer face of the mounting plate.

[0021] According to a feature of the invention, the plastic material of the connector and the plastic material of said part of the wall have equivalent melting temperatures.

[0022] This facilitates the adhesion of the two materials since they have approximately the same hardening time. For example, the melting temperature of one of the two materials is around 200°C and the melting temperature of the other of the two materials is around 200°C + / - 20°C.

[0023] According to a feature of the invention, the plastic material of the connector comprises pigments.

[0024] More specifically, the plastic material of the connector can be pigmented to display an orange color, in order to comply with a standard for identifying the current voltage likely to pass through the connector. The use of orange pigment is particularly useful in automotive applications with a high-voltage on-board electrical system, on the order of 800V.

[0025] According to a feature of the invention, the plastic material of the connector has electrical insulation performance which is superior to that of the plastic material of said part of the wall.

[0026] It should be noted here that not only is the connector, both the sheath and the plate, electrically insulating to prevent malfunctions and danger to the user, but also that the wall to which the connector is attached does not need to be insulated, or much less so than the connector itself. The two-material construction eliminates the need to impose electrical insulation requirements on the entire housing, which is made as a single unit with the connector, and therefore reduces the cost of producing the housing.

[0027] According to a feature of the invention, the plastic material of said part of the wall differs from the plastic material of the connector at least in the presence of metallic reinforcements.

[0028] According to one feature of the invention, the metallic reinforcements consist of fibers embedded in the mass of the wall.

[0029] According to a feature of the invention, the housing includes electromagnetic shielding means arranged as a coating on said part of the wall.

[0030] The preceding characteristics allow the production of a single-piece housing, to limit the number of fixing elements, and made of plastic, to limit the carbon footprint of the housing, while being able to separate, in this bi-material construction of the housing, the functions between the walls delimiting the housing of the electronic components, which must be rigid and block electromagnetic interference, and which are advantageously associated for this purpose with metallic elements, and the connector, which must above all be electrically insulating.

[0031] According to one feature of the invention, the housing comprises two connectors, including at least one power connector and one signal transmission connector, each of the connectors being made of a plastic material different from the plastic material forming predominantly the wall to which each connector is attached.

[0032] The two connectors can be made of the same plastic material, and may have a common plate if necessary.

[0033] Alternatively, the two connectors can be made of a different plastic material than the wall to which they are attached, so that the housing is made in one piece using three different plastic materials. This can, in particular, allow for different electrical insulation capacities depending on whether the insulation is for a high-voltage connector, for currents ranging from approximately 400V to 800V, or a low-voltage connector, for control signal transmission currents of approximately 24V or 48V.

[0034] The invention further relates to an electronic device comprising a housing as previously mentioned and electronic components housed in said housing.

[0035] Electronic components may include, in particular, transistors, a printed circuit board, capacitive and / or resistive elements, and include a A control module capable of receiving command instructions via the electrical connections and controlling the operation of the electronic components accordingly. The electronic device according to the invention may, in particular, be a converter, whether a rectifier or an inverter.

[0036] The invention also relates to a method of manufacturing a housing as previously mentioned, in which two different plastics are injected in the same injection operation via at least two separate injection points, the two different plastics being injected so that they meet at the wall to which at least one connector is attached.

[0037] The plastics flow towards each other from their injection point, and it is their meeting that forms the junction zone. The first plastic is injected into the injection mold and flows through the channels within the mold until it enters the junction zone, where it meets the second plastic flowing from another injection point. This differs from a two-stage injection process in which, firstly, a first plastic is injected until it occupies its allocated space, this space being defined, in particular, by a drawer inserted into the mold, and secondly, a second plastic is injected after the drawer has been removed from the mold.

[0038] It is precisely the contact with the other injected plastic material that stops the propagation of the plastic material. The junction zone is not a clean surface, but a heterogeneous zone with the first and second plastic materials intermingled.

[0039] The position of the injection points specific to each plastic material, the injection time of each plastic material and / or the injection rate of each plastic material are determined so that the meeting of the plastic materials takes place in the desired junction zone, and in particular in the close vicinity of the sleeve.

[0040] According to one feature of the invention, the two different plastic materials are injected simultaneously, at different flow rates.

[0041] According to one feature of the invention, the two different plastic materials are injected successively, without the configuration of the injection mold being modified.

[0042] By this notion of unmodified injection mold configuration, it should be understood that once the mold is closed, the two plastic materials are injected before the mold is reopened.

[0043] According to one feature of the invention, the two different plastic materials are injected into a mold in which electrical connection pins are already positioned, the plastic material of the connector being injected to surround said pins. electrical connection and isolate them from the plastic material of the wall to which the connector is attached.

[0044] Other features, details and advantages of the invention will become clearer upon reading the following description on the one hand, and several illustrative and non-limiting examples of embodiments given with reference to the accompanying schematic drawings on the other hand, in which:

[0045] [Fig. 1] partially represents an electronic device and in particular a housing of which a side wall is particularly visible, said side wall here bearing two connectors;

[0046] [Fig.2] represents a cross-sectional view of the side wall, the section being made on a connector to make particularly visible the realization of the housing according to the invention with a one-piece assembly in which the connector is formed in a first type of material and the side wall, outside the connector, is formed in a second type of material;

[0047] [Fig.3] is a detailed view of [Fig.2], in the junction area where the first type of material alongside the second type of material;

[0048] [Fig.4] is a flowchart illustrating the process steps for obtaining a casing of the electronic device according to one of figures 1 to 3.

[0049] As a reminder, the invention relates to an electrical device 1, in particular configured to equip a motor vehicle, and more particularly a housing made in one piece, with in particular a monobloc assembly formed by an electrical connector and a wall of the housing to which the connector is attached.

[0050] The electronic device 1 comprises a housing 2 and electronic components housed in the housing. These electronic components are electrically powered via at least one connector 4 forming part of the housing.

[0051] The housing 2 comprises walls 6, 8 forming a frame, among which a front wall 6 can be distinguished, to which at least one connector 4 is attached. The frame formed by the walls 6, 8 protects the electronic components arranged within the housing. The housing further comprises a cover 10, attached to the walls 6, 8 of the housing 2 by fastening means, here screw means 12.

[0052] As mentioned above, connector 4 is attached to a wall of the housing 2, here the front wall 6. In the illustrated example, the housing 2 has two connectors 4, one of which is a power connector, for supplying high-voltage power to the electronic components inside the housing 4, and the other a signal transmission connector, for transmitting operating commands to these electronic components from a control unit external to the housing. Both connectors 4 are attached to the same wall 6 of the housing 2 in the illustrated example, but it should be noted that these connectors 4 can be attached to different walls. By Furthermore, what will be described later can perhaps be implemented for one or for each of the connectors.

[0053] According to the invention, the housing 2 is formed by a one-piece plastic assembly with two different plastic materials, a first plastic material MPI participating in making the housing 2 as a whole, and at the very least, at least a part of the wall 6 to which the connector 4 is attached, and a second plastic material MP2 participating in making the connector 4.

[0054] Fig. 2 illustrates more particularly the wall to which connector 4 is attached, and this connector 4.

[0055] The wall to which the connector 4 is attached is a front wall 6 which extends perpendicularly or substantially perpendicularly a bottom wall 7 of the housing.

[0056] The front wall 6 here has at its free end, opposite the bottom wall, an edge 13 intended to form a bearing surface for the cover 10 visible in [Fig. 1]. The means for fixing the cover, also visible in [Fig. 1], can pass through the cover and this edge 13 of the front wall.

[0057] The connector 4 comprises a sleeve 14 and a plate 16, with the sleeve 14, as mentioned previously, forming a projection, towards the outside of the housing, from the wall 6 to which the connector is linked, and the plate 16 forming a base to the sleeve 14 and extending in continuity with said wall 6.

[0058] The sleeve 14 is hollow, as can be seen in [Fig.1], and it is configured to surround electrical connector pins 18. The sleeve 14 is also configured and dimensioned to receive an electrical connector element, not shown here, suitable for cooperating with the electrical connector pins 18 in a male-female form cooperation.

[0059] This electrical connection allows the electronic components housed inside the casing to be powered, and for this purpose the electrical connection pins 18 pass through the base of the sleeve 14, which is formed by the previously mentioned plate 16. This passage is sealed insofar as, as will be described in detail below, the electrical connection pins 18 are embedded in the material forming the plate 16.

[0060] In the example illustrated in [Fig.1], the two connectors 4 have their own plate 16, but it may be envisaged, without leaving the context of the invention, that a common plate be formed.

[0061] As mentioned, the plate 16 extends perpendicularly or substantially perpendicularly to the sleeve 14. It is traversed substantially in its center by the electrical connection pins 18 and it has a peripheral portion 17 which extends perpendicularly or substantially perpendicularly from the sleeve towards the outside of it. As will be described below, the plate 16 is made jointly with the sleeve 14 by injecting a material into a mold in which the electrical connection pins 18 are already arranged.

[0062] It is notable on [Fig.2] that the plate 16 forms a portion of the wall 6 to which the connector 4 is linked.

[0063] The thickness of the plate 16 is the same as the thickness of the wall 6 to which the connector 4 is attached. This thickness is measured in a direction perpendicular to the plane of the wall 6, from the inside of the housing 2 to the outside of the latter. It could be envisaged, in an alternative embodiment not shown, that the front wall 6 has a variable thickness, but it should be noted that the thickness of this wall 6 and the thickness of the plate 16 of the connector 4 are equivalent in the junction zone 20 between the material of the plate, here the second plastic material MP2, and the material of the wall 6, here the first plastic material MPI.

[0064] In this way, the plate 16 and the wall 6 are arranged in continuity with each other, the plate 16 forming a part of said wall 6, with the inner face 60 of the wall 6 and the inner face 160 of the plate 16 which are arranged in the same plane and the outer face 62 of the wall 6 and the outer face 162 of the plate 16 which are arranged in the same plane.

[0065] As a reminder, according to the invention the housing 2 is made in one piece but with at least two different materials, one of which is used to make at least part of the wall 6 to which the connector is attached and the other is used to make the connector 4.

[0066] A first plastic material (PM) is used to produce the side wall 6. By way of non-limiting example, the first plastic material (PM) may be a polymer such as polyethylene terephthalate (PBT) or polyphenylene sulfide (PPS). The first plastic material may also be characterized by its melting point, which is, for example, approximately 200°C.

[0067] The first MPI plastic material is advantageously reinforced by metallic elements integrated within the material or associated with a metallic coating on the surface of the first plastic material. The metallic elements embedded within the material may, in particular, be metallic fibers whose function is to stiffen the structure of the housing and, in the event of an impact, to protect the electronic components housed within the housing. The metallic coating on the surface, as well as the metallic elements embedded within the material, has the primary function of contributing to the electromagnetic shielding of the housing by forming a Faraday cage. This metallic coating may be applied to one or both of the internal and external surfaces of the housing.

[0068] The first MPI plastic material is advantageously used to form, in addition to this wall 6 to which the connector 4 is linked, all the walls of the housing and, where applicable, the cover 10.

[0069] A second plastic material MP2 is used to make the connector 4. By way of non-limiting example, the first plastic material MPA can be a polymer such as polyethylene terephthalate (PBT) or polyphenylene sulfide (PPS), or even polyamide (PA).

[0070] The second plastic material can also be characterized by its melting point, which is equivalent to that of the first plastic material, here, for example, approximately 200°C. The second plastic material is also chosen in particular for its electrical insulation properties.

[0071] The second plastic material MP2 is used to form the sleeve 14 and the plate 16. In this application context, it is noteworthy that the connector 4 must have a distinctive color when associated with the transmission of high-voltage current. For example, a connector associated with a high-voltage current transmission of approximately 800V must be orange. Advantageously, pigments of the appropriate color, orange in the given example, are incorporated into the second plastic material MP2, and the one-piece, two-material construction of the housing allows for targeted placement of the pigments on the connector.

[0072] At the junction between the plate 16, made with the second plastic material MP2, and the wall 6 to which the connector is linked, made with the first plastic material MPI, a junction zone 20, visible on the [Fig.3] and whose shape will be more easily described with the method, is formed.

[0073] We will now describe the manufacturing process of a case as just described, referring in particular to the flowchart of [Fig.4].

[0074] A first preparation step El consists of configuring the injection mold, and the multiple fluid circulation channels within it, in particular by inserting electrical connection pins 18 across the material circulation channel corresponding to the formation of a front wall 6 to which the connector 4 must be linked.

[0075] The mold is then closed in a second preparation step E2 and remains in this configuration until the two different plastic materials that will be injected into it have solidified and adhered to each other to form a single piece.

[0076] Once the mold is closed, two injections of different plastic materials are carried out in parallel, each of the two different plastic materials MPI, MP2 being injected into the mold via an injection point which is specific to it.

[0077] The first plastic material MPI, intended to form the housing, can be injected in a first injection step E3 from a plurality of injection points. The second plastic material MP2, intended to form a connector 4, is injected into the mold in a second injection step E4 via an injection point positioned in an area of ​​the mold corresponding to the formation of this connector, whether it be the base plate or the sleeve.

[0078] In a first embodiment, the two plastics are injected simultaneously. More specifically, the first injection step E3 and the second injection step E4 are initiated simultaneously.

[0079] The first plastic material MPI, i.e. the material intended to form at least part of the wall to which the connector 4 is attached, is injected at different injection points, and a portion of this first plastic material MPI spreads towards the junction zone 20 where it is intended to meet the second plastic material MP2, i.e. the material intended to form a connector 4. The position of the injection point of this first plastic material that is closest to the junction zone is defined so that the first plastic material arrives in the junction zone simultaneously with the second plastic material.

[0080] Depending on the time it takes for the first plastic material MPI to reach the junction zone 20, and in order to ensure that the two plastic materials arrive simultaneously in this junction zone 20, the injection rate of the second plastic material MP2 may be different, and in particular reduced, compared to the injection rate of the first plastic material MPI.

[0081] In a second embodiment, a delayed injection of the two plastics is carried out. More specifically, the first injection step E3 and the second injection step E4 are initiated with a time offset.

[0082] The first plastic material MPI is injected at various injection points, and a portion of this first plastic material MPI spreads towards the junction zone 20 where it is intended to meet the second plastic material MP2. When the first plastic material arrives near the junction zone, the second plastic material is injected so that it arrives in the junction zone simultaneously with the first plastic material.

[0083] In this case, the injection flow rate of the two plastics can be the same or different, the injection flow rate of the second plastic can in particular be increased, compared to the injection flow rate of the first plastic, to ensure that this second plastic injected at the last moment reaches the junction zone quickly enough.

[0084] In each of these embodiments, and as can be seen in [Fig. 3], the boundary between the two different plastic materials may not be planar because it is the contact with one plastic material that stops the propagation of the other plastic material.

[0085] In other words, the junction zone 20, which corresponds to this demarcation between the two plastics MPI, MP2, is formed by the simultaneous arrival of two plastics, which has the effect of not creating a zone with a flat demarcation surface, but on the contrary a zone in which a little of the first plastic material MPI can be mixed with the second plastic material MP2 and vice versa.

[0086] Next, we allow it to harden in a finishing step E5 and we demold the housing by opening the injection mold.

[0087] As described above through various embodiments, the present invention achieves its objective by providing a housing for an electronic device made from a single piece of plastic to facilitate the manufacturing process and implement materials that reduce the carbon footprint of this electronic device. The use of two different plastics injected in the same injection molding operation makes it possible to produce a housing with connectors made as a single piece with the housing frame, which facilitates sealing, while also allowing the separation of the mechanical and electrical functions and properties of the frame and the connector.

[0088] The present invention is not limited to the means and configurations described and illustrated herein and also extends to any equivalent means and configuration as well as to any technically operative combination of such means.

Claims

Demands

1. Housing (2) of an electronic device (1) comprising at least one wall (6), participating in delimiting a housing for electronic components of said device, and at least one electrical connector (4) linked to said wall (6) and comprising a sleeve (14) protruding from said wall (6) and dimensioned to house electrical connection elements (18), characterized in that the sleeve (14) of the at least one connector (4) and at least a part of the wall (6) form a single unit and are made of two different plastics (MPI, MP2).

2. Housing (2) according to claim 1, characterized in that the connector (4) further comprises a plate (16) extending perpendicularly, or substantially perpendicularly, to the sleeve (14), said plate (16) extending in continuity with the wall, said plate (16) being made of the same plastic material (MP2) as the sleeve (14).

3. Housing (2) according to claim 2, characterized in that the plate (16) has a thickness equal to the thickness of said wall (6), the plate (16) extending substantially in the same plane as said wall (6).

4. Housing (2) according to any one of claims 1 to 3, characterized in that the plastic material (MP2) of the connector (4) and the plastic material (MPI) of said part of the wall (6) have equivalent melting temperatures.

5. Housing (2) according to any one of claims 1 to 4, characterized in that the plastic material (MP2) of the connector (4) comprises pigments.

6. Housing (2) according to any one of claims 1 to 5, characterized in that the plastic material (MP2) of the connector (4) has electrical insulation performance which is superior to that of the plastic material (MPI) of said part of the wall (6).

7. Housing (2) according to any one of claims 1 to 6, characterized in that the plastic material (MPI) of said part of the wall (6) differs from the plastic material (MP2) of the connector (4) at least in the presence of metal reinforcements.

8. Housing (2) according to claim 7, characterized in that the metallic reinforcements consist of fibers embedded in the mass of the wall.

9. Housing (2) according to any one of claims 1 to 8, characterized in that it comprises electromagnetic shielding means arranged as a coating on said part of the wall (6).

10. Housing (2) according to any one of claims 1 to 9, characterized in that it comprises two connectors (4) of which at least one power connector and one signal transmission connector, each of the connectors (4) being made of a plastic material different from the plastic material (MPI) predominantly forming the wall (6) to which each connector (4) is attached.

11. Electronic device (1) comprising a housing (2) according to any one of claims 1 to 10 and electronic components housed in said housing (2).

12. A method for manufacturing a housing (2) according to any one of claims 1 to 10, wherein two different plastics (MPI, MP2) are injected in the same injection operation via at least two separate injection points, the two different plastics (MPI, MP2) being injected so that they meet at the wall (6) to which at least one connector (4) is attached.

13. A manufacturing process according to claim 12, wherein the two different plastics (MPI, MP2) are injected simultaneously, at different flow rates.

14. A manufacturing method according to claim 12, wherein the two different plastics (MPI, MP2) are injected successively, without the configuration of the injection mold being modified.

15. A manufacturing method according to any one of claims 12 to 14, wherein the two different plastics (MPI, MP2) are injected into a mold in which electrical connection pins (18) are already positioned, the plastic material (MP2) of the connector (4) being injected to surround said electrical connection pins (18) and insulate them from the plastic material (MPI) of the wall (6) to which the connector (4) is attached.

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