FR3067876A1 - INDUCTION ENERGY TRANSMISSION SYSTEM - Google Patents

Abstract

The present invention relates to an induction energy transfer system comprising a transmitter (1) comprising a first housing including upper and lower housings for containing a coupling module and an electronic module, the upper housing having an upper wall and at least one a lug disposed at the periphery or at the center of the upper wall, the lower casing having a bottom and at least one side wall, the casing further comprising fixing elements each having a threaded rod intended to be inserted through the bottom and of the tab when the upper and lower housings are assembled, the length of the threaded rod being less than or equal to a height of the electronic module.

Description

The present invention relates to the general technical field of contactless electrical energy transfer systems, whether all or part of the systems is fixed or mobile.

BACKGROUND OF THE INVENTION

Contactless energy transmission systems are conventionally composed of two parts:

- A primary stage: a first so-called "emitting" part associated with an external energy supply source, and

- A secondary stage: a second part known as “receiver” associated with an electronic device making it possible to convert energy into an electric source exploitable by the external output load.

The transmitting part conventionally comprises a primary housing composed of an upper casing and a lower casing in which are housed:

a primary coupling module including a primary coil and associated electromagnetic elements, and

a primary electronic module including, for example, an electronic part comprising a primary electronic converter.

The receiving part conventionally comprises a secondary housing composed of an upper casing and a lower casing in which are housed:

a secondary coupling module including a secondary coil and associated electromagnetic elements, and

a secondary electronic module including for example an electronic part comprising a secondary electronic converter.

The primary and secondary coils are galvanically and electrically isolated from each other, but intended to be coupled together electromagnetically.

To do this, they must be placed close to each other.

Using the energy supplied by the power source, a primary electronic converter generates alternating electric current which is injected into the primary coil.

This induces the generation of an alternating magnetic field. This magnetic field is picked up by the secondary coil and generates an electric current in the secondary coil. A secondary electronic converter converts this electric current into a source of electrical energy that can be used by the load at the output of the secondary stage. Energy transmission therefore takes place by electromagnetic induction.

A disadvantage of existing transmission systems is that it is difficult to secure the upper and lower casings of the housings without the fastening elements causing disturbances tending to deflect, disturb, or interrupt the field lines generated / received by the primary / secondary coils.

Furthermore, the size of the transmitting and receiving coils and the dimensioning of the primary and secondary electronic devices depend on many factors, including the amount of energy to be transmitted, the distance of the air gap between the coils, etc.

The existing systems also have other drawbacks both in terms of the alignment tolerance of the primary and secondary coils with respect to each other and in terms of the air gap distance separating the faces of the facing coils.

Indeed, the magnetic flux emitted by the primary coil and received by the secondary coil is strongly influenced by the positioning of the primary and secondary coils with respect to each other.

However, the overall performance of the system is directly linked to the system's ability to correctly transmit the magnetic flux between the coils, and therefore the recovery rate between the primary and secondary coils.

This is one of the main problems encountered in the implementation of induction power transmission technology.

An object of the present invention is to propose for a contactless energy transmission system including a new housing structure making it possible to overcome at least one of the aforementioned drawbacks.

BRIEF DESCRIPTION OF THE INVENTION

To this end, the invention provides an induction energy transfer system comprising a transmitter comprising a primary coupling module, a primary electronic module, and a first housing including upper and lower casings intended to be assembled to contain the module. primary coupling and the primary electronic module, remarkable in that:

- the upper casing of the first housing includes:

o an upper wall and, o at least one tab disposed on the upper wall, the tab extending outwards perpendicular to the upper wall and including a hole,

- the lower casing of the first housing includes:

o at least one side wall, and o a bottom plate extending perpendicular to said and at least one side wall, the bottom plate including at least one through opening, the opening being intended to extend coaxially to a hole respectively when the upper and lower housings are assembled,

- The first housing further comprises at least one fixing element including a threaded rod intended to be inserted into the through opening and the hole when the upper and lower casings are assembled, the length of the threaded rod being less than or equal to the height of the electronic module.

The fact that the upper casing comprises at least one lug for receiving a fixing element, the lug extending perpendicular to a plane containing the upper wall of the casing makes it possible to limit the interference induced by the fixing elements vis-à-vis screw field lines generated / received by the primary / secondary coils, the fasteners extending under the coupling module.

Preferred but non-limiting aspects of the induction energy transfer system are:

- Advantageously:

o the upper casing of the first housing may comprise at least two peripheral tabs arranged on the periphery of the upper wall, each peripheral tab extending outward perpendicularly to the upper wall and including a hole, o the plate forming the bottom of the casing lower may include at least two peripheral openings at its periphery, each peripheral opening being intended to extend coaxially to the hole of a respective peripheral tab when the upper and lower housings are assembled;

- The upper casing of the first housing may further comprise a peripheral skirt extending outward perpendicularly to the upper wall, the upper wall and the peripheral skirt forming a housing for the coupling module;

- The plate forming the bottom of the lower casing and the side wall of the lower casing of the first housing can constitute a housing for the electronic module;

- The lower casing of the first housing may further comprise at least two grooves formed in the side wall, each groove being intended to cooperate with a respective peripheral tab of the upper casing;

- The cross-sectional shape of each groove can be complementary to the cross-sectional shape of its associated tab;

- The lower casing of the first housing may further comprise at least two protrusions provided with passage openings formed in the side wall, each protrusion extending between the bottom and a respective groove;

- The cross-sectional shape of each tab can be trapezoidal;

- the upper and lower casings may have a hexagonal shape, the upper casing including six legs, and the lower casing including six side walls and six grooves, the grooves extending to the edges of the side walls of the lower casing;

- Advantageously:

o the upper casing of the first housing may include a central tab disposed in a central region of the upper wall, the central tab extending perpendicular to the upper wall and including a hole, o the bottom plate of the lower casing may include an opening central in a central region, the central opening being intended to extend coaxially to the hole in the central leg when the upper and lower casings are assembled;

the system may further comprise a receiver comprising a secondary coupling module, a secondary electronic module and a second housing separate from the first housing, the second housing including an upper casing and a lower casing:

o the upper casing of the second housing comprising:

an upper wall and a peripheral skirt extending outward perpendicularly to the upper wall, the upper wall and the skirt forming a housing for the coupling module, at least one tab disposed on the upper wall and extending towards the exterior perpendicular to the upper wall, the tab including a hole, o the lower casing comprising:

a bottom plate including at least one through opening, the opening being intended to extend coaxially to the hole when the upper and lower casings are assembled, and at least one side wall extending outward perpendicular to the plate forming bottom, plate and side wall forming a housing for the electronic module, the second housing further comprising at least one fixing element including a threaded rod intended to be inserted into the through opening and the hole when the upper and lower housings are assembled, the length of the threaded rod being less than or equal to a height of the electronic module.

BRIEF DESCRIPTION OF THE DRAWINGS

Other advantages and characteristics of the energy transmission by induction system will emerge more clearly from the description which follows of several variant embodiments, given by way of nonlimiting examples, from the appended drawings in which:

- Figure 1 schematically illustrates an energy transmission system by induction comprising a transmitter assembly and a receiver assembly;

- Figure 2 is an exploded perspective view of primary and secondary housings each including a coupling module and an electronic module;

- Figures 3 and 4 are cross-sectional views of a primary housing disposed opposite a secondary housing.

DETAILED DESCRIPTION OF THE INVENTION

The various characteristics of the energy transmission system according to the invention will now be described with reference to the figures. In these various figures, the equivalent elements are designated by the same reference numeral.

1. General information on the contactless energy transmission system

Referring to Figure 1, an electromagnetic induction power transmission system is illustrated. The system includes a transmitter 1 and a receiver 2.

The transmitter 1 can be connected to a source of electrical energy supply (not shown). Receiver 2 can be connected to a load to be supplied (not shown).

The transmitter 1 and the receiver 2 can include:

a coupling module (primary or secondary) 11, 21 including a coil (primary or secondary) and associated electromagnetic elements, and

an electronic module (primary or secondary) 12, 22 including for example an electronic part comprising an electronic converter (primary or secondary).

The operating principle of the contactless energy transmission system is as follows.

Using the energy supplied by the power source, the electronic converter of transmitter 1 generates an alternating electric current which is injected into the primary coil to create a magnetic field.

Under the effect of the magnetic field produced by the primary coupling module 11, an electric current is generated in the secondary coil of the secondary coupling device 21. This electric current is transmitted to the secondary electronic converter which converts it into electric energy exploitable by the device charge.

2. Electronic module and coupling module

The electronic module (primary or secondary) 12, 22 comprises one (or more) electronic card (s) which can be arranged in different configurations (known to those skilled in the art) depending on the intended application. This is why the electronic module will not be described in more detail below.

The electronic module 12, 22 is electrically connected to the coupling module 11, 21 by means of connection cables. The coupling module 11,21 can be mounted above the electronic module 12, 22. As a variant, all or part of the electronic cards constituting the electronic module 12, 22 can be positioned next to the coupling module 11,21.

With reference to FIG. 2, each coupling module (primary or secondary) 11, 21 comprises:

- a coil (primary or secondary) and

- a layer of ferromagnetic material and / or other electromagnetic elements.

Each coil (primary or secondary) is made up of one or more layers of windings. In the case of a plurality of windings, the different elementary layers can be stacked. Each winding is obtained from a flexible electric wire or a conductive material. The elementary windings are centered. The wire is wound in turns around the longitudinal axis A-A ’, the turns can be organized in radial flat layers so as to form an elementary winding, these layers can then be stacked on top of each other. The elementary windings stacked with a coil (primary or secondary) are electrically connected to each other. Advantageously, in the case of a plurality of elementary windings, these can be connected in series with one another and / or in parallel with each other. The successive stacked elementary windings can be separated by an insulating layer. As an indication, primary and secondary coils intended to cooperate together may include different numbers of turns and different numbers of stacked elementary windings.

The layer of ferromagnetic material may be composed of a plurality of ferrite blocks or may be composed of a one-piece ferrite. The layer of ferromagnetic material is used to guide the field lines generated by the stacked windings. More specifically, the stacked elementary windings extend above the layer of ferromagnetic material, an electrically optional insulating layer can be provided between the layer of ferromagnetic material and the stacked elementary windings.

The primary (respectively secondary) coupling module 11, 21 and the primary (respectively secondary) electronic module 12, 22 of the transmitter (respectively of the receiver) 1,2 are each housed in a housing which will now be described in more detail. .

Advantageously, the transmitter and the receiver 1, 2 can comprise housings of identical shapes. This makes it possible to standardize the overall design of the systems, and therefore to reduce their manufacturing cost.

In particular, the transmitter 1 and receiver 2 modules can be contained in respective hexagonal boxes extending along a longitudinal axis A-A ’. The fact that the housings are hexagonal has many advantages as will appear more clearly below.

3. Housing

An example of a transmitter 1 housing will now be described in more detail. It is obvious to a person skilled in the art that the receiver 2 can comprise a housing of equivalent shape and structure.

With reference to Figures 1 to 4, the housing includes:

an upper casing 13 (respectively 23 for a receiver 2) or “upper casing”, and

- A lower casing 14 (respectively 24 for a receiver) or "lower casing" intended to cooperate together.

The upper and lower housings 13,14 have a hexagon shape and extend along a central axis A-A ’, but could have other shapes (circular, square, triangular, rectangular, etc.).

The fact that the upper and lower casings 13, 14 have a hexagonal shape makes it possible to have fastening elements 15 (respectively 25 for a receiver 2) around the coupling and electronic modules 11, 12. More precisely, the hexagonal shape of the casings makes it possible to position the fastening elements 15 so that they extend radially outside the coupling and electronic modules 11, 12.

3.1. Upper housing

The upper casing 13 has an upper wall 131 (respectively 231 for a receiver 2) of electrically insulating material and constituting an interfacing surface on which the coupling module 21 of a receiver 2 is intended to come opposite. The upper wall 131 can be flat, concave or convex depending on the intended application, a concave or convex upper wall which can be adapted to the implantation of the system in or outside a sphere, a tube, or any curved wall.

Advantageously, the upper face of the upper wall can optionally include positioning or information reference means, making it possible in particular to differentiate the upper face from a lower face of the housing, such as a drawing or a label.

The upper casing 13 also includes a peripheral skirt 132 (respectively 232 for a receiver 2) extending outward perpendicularly to the upper wall 131 (or to a plane passing through the upper wall when the latter is concave or convex) . The peripheral skirt 132 constitutes with the upper wall 131 a housing intended to receive the various elements of the coupling module 11 (in particular coil and ferromagnetic material). Advantageously, the skirt 132 may comprise, on its face intended to come opposite the lower casing 14, an annular rib 133 (respectively 233 for a receiver 2) for the reception of a seal 16 (respectively 26 for a receiver 2) allowing sealing the interface between the upper and lower casings 13, 14 once the housing is assembled.

The upper casing 13 further comprises at least two legs 134 (respectively 234 for a receiver 2) extending perpendicular to the upper wall 131, in the extension of the peripheral skirt 132. The length of each leg 134 is provided sufficient so that the latter at least partially covers the lower casing 14 once the housing has been assembled.

In the embodiment illustrated in FIG. 3, the upper casing 13 comprises six tabs 134 positioned at the six vertices of the upper casing 13 of hexagonal shape.

It is obvious to a person skilled in the art that the upper casing 13 may include fewer (or more) six legs (in particular, two, three, four, or even a single leg if the latter is located in the center of the casing as it will be described in more detail below).

The legs 134 are intended to cooperate with grooves 144 (respectively 244 for a receiver 2) formed in the lower casing 14.

Each tab 134 comprises a tapped blind hole for the passage of the fastening elements 15, such as screws or bolts. Of course, the blind hole may not be tapped when using self-tapping screws. This hole may also not be blind and be through.

Advantageously, each tab 134 may have a trapezoidal profile in cross section. This facilitates the insertion of each tab 134 into the groove 144 which is associated with it.

Preferably, the large base of the trapezoidal profile is closer to the central axis AA ’than the small base. This ensures that the tab 134 is held in position in its associated groove 144.

Where appropriate, the side wall (s) of the lower casing 14 may surround all or part of the tabs 134 of the upper casing 13.

3.2. Lower housing

The lower casing 14 has one (or more) side wall (s) 141 (respectively 241 for a receiver 2). The side wall (s) 141 constitute a housing intended to receive the various elements of the electronic module 12 (coil and ferromagnetic material in particular). The lower casing can be made of a non-magnetic material - such as aluminum, copper, bronze, or other similar alloys - so as to constitute both an electromagnetic shielding of the electronic module and both to ensure the heat dissipation of the internal electronic components heating up during the operation of the module.

The bases of the side wall (s) 141 are closed (top and bottom) by plates 142 (respectively 242 for a receiver 2), adjusted to the shapes of the wall (s) side (s) 141 and respectively forming a bottom (ie wall opposite to the upper casing) and a cover (wall closest to the upper casing).

The cover can be made of a non-magnetic material - such as aluminum, copper, bronze, or other similar alloys - so as to absorb, direct, return the leaks of field lines generated by the windings to the magnetic module. The disturbances radiated by the transfer of energy between transmitter and receiver due to field line leaks are thus reduced.

Advantageously, the side wall (s) may include, on its face (s) intended to come opposite the adjusted plates (or sheets), an annular rib 143 (respectively 243 for a receiver 2) for the reception of a seal making it possible to ensure sealing at the interface between the side wall (s) 141 and the adjusted plates 142 (or sheets) once the lower casing 14 has been assembled.

Of course, the side wall (s) 141 and one of these plates 142 (or sheet metal) can be produced in one piece (for example by stamping).

The arrangement of the electronic cards of the electronic module 12 may vary depending on the application and will not be described in more detail below.

The side wall (s) 141 of the lower casing 14 includes (include) grooves 144, each groove 144 being intended to cooperate with a respective tab 134 of the upper casing 13. The cross-sectional shape of each groove 144 is complementary to the cross-sectional shape of its associated tab 134.

The adjusted plate 142 (or sheet) forming the bottom comprises through openings formed in line with the grooves 144. Each through opening is intended to extend coaxially to the hole of a respective tab 134 of the upper casing 13. More precisely in the case of Figure 2, the bottom of the lower casing 14 has six through openings extending parallel to the axis AA '. The through openings are preferably arranged near the opposite vertices of the hexagon.

In addition to the grooves 144, the side wall (s) of the lower casing may (may) include protrusions 145 provided with passage openings, in particular in the case where the length of the legs 134 of the upper casing 13 is lower than the height of the lower casing 14. Each protrusion 145 extends between the plate 142 (or sheet metal) fitted forming the bottom of the lower casing 14 and a respective groove 144. The presence of the protuberances 145 makes it possible to surround the portion of threaded rod of the fastening elements 15 extending between the plate 142 forming the bottom of the lower casing 14 and the lugs 134 once the upper and lower casings 13, 14 are assembled.

3.3. Assembled housing

As illustrated in Figures 3 and 4, the assembly of the housing consists of fitting the upper and lower casings 13, 14 (respectively 23, 24) together.

When the upper casing 13 is fitted onto the lower casing 14 to form the housing, the tabs 134 fit into the grooves 144 of the side wall (s) 141, so that the tabs 134 s 'extend at least partially along the (or) side wall (s) 141 of the lower casing 14, where appropriate all or part of the legs 134 of the upper casing 13 may be surrounded by the (or) wall (s) side (s) 141 of the lower casing 14.

It is then possible to insert fixing elements 15 - such as screws or bolts or self-tapping screws - through the through openings of the plate 142 forming the bottom of the lower casing 14. Each fixing element 15 comprises a head and a threaded rod. The threaded rod of each fastening element 15 is screwed (or bolted) through the adjusted plate 142 (or sheet) forming the bottom and a respective tab 134 (possibly after having passed through the protuberances 145 if the lower casing 14 includes them ). We then obtain the integral box illustrated in Figures 3 and 4.

Advantageously, the length of the threaded rod of each fastening element 15 is provided for less than or equal to the difference between:

- the total height of the box, and

- the height of the housing intended to receive the coupling module 11.

This ensures that the threaded rods of the fastening elements 15 do not intersect any of the planes P perpendicular to the axis A-A 'and passing through the coupling module 11.

In other words, the end of the threaded rod of each fixing element 15 extends below the coupling module 11: the length of the threaded rod of each fixing element 15 is therefore less than the distance between the adjusted plate 142 (or sheet) forming the bottom of the lower casing 14 and the coupling module 11.

This makes it possible to limit the disturbances generated by the fastening elements 15 tending to deflect (see interrupting) the field lines C generated / received by the primary / secondary coils of the coupling modules 11, 21.

3.4. Optional aspects of the case

One of the walls of the lower casing 14 may include one (or more) connection terminal (s) or connector (s) such as an electrical outlet (plug or receptacle, male or female), a USB connection socket, etc. ., see a cable outlet, the type of connection terminal depending on the intended application.

Advantageously, the wall of the lower casing 14 comprising the terminal (s) may be removable from the lower casing during the manufacture of the product. This makes it possible to limit the costs of manufacturing the boxes by having a lower casing body (i.e. the other walls of the lower casing) standardized, only the removable wall being modified to produce “tailor-made” electronic modules.

The removable wall can be slidably mounted on the lower casing body 14. In this case, U-shaped rails (in section) can be provided on the lower casing body.

The removable wall can also be mounted parallel to one of the faces of the lower casing body 14. In this case, an opening is provided on the appropriate face of the lower casing body.

4. Conclusion

The system described above makes it possible to transmit energy by induction between a transmitter 1 and a receiver 2.

The presence of tabs 134, 234 on the upper casing 13, 23 associated with the use of fastening elements 15, 25 whose threaded rod extends under the coupling module 11, 21 makes it possible to limit the disturbances tending to deflect (see interrupt) the C field lines generated / received by the primary / secondary coils.

The reader will have understood that many modifications can be made to the invention described above without materially departing from the new teachings and the advantages described here.

For example, in the various embodiments described above, the upper casing 13 (respectively 23) of the casing of the transmitter 1 (respectively of the receiver 2) included at least two tabs 134 (respectively 234) disposed at the periphery of the wall upper 131 (respectively 231), each tab 134 (respectively 234) extending outward perpendicular to the upper wall 131 (respectively 231) and including a hole.

As a variant, the upper casing 13 (respectively 23) of the casing of the transmitter 1 (respectively of the receiver 2) may comprise a single tab disposed in a central region of the upper wall 131 (respectively 231), the tab extending towards the outside perpendicular to the upper wall 131 (respectively 231) and including a hole. This single tab is intended to extend through the coupling modules 11 (respectively 21) and electronics 12 (respectively 22) when the upper casings 13 (respectively 23) and lower 14 (respectively 24) are assembled.

In this case, the lower casing 14 (respectively 24) comprises a single through opening formed in the center of the bottom of the lower casing so as to extend coaxially to the hole in the tab when the upper and lower casings are assembled.

A threaded rod of a fastening element 15 (respectively 25) intended to be inserted into the through opening and the hole then makes it possible to secure the upper and lower casings once these have been assembled. The length of the threaded rod is advantageously less than or equal to the height of the electronic module to limit the disturbances tending to deflect, disturb, or interrupt the field lines C generated (respectively received) by the coupling module of the transmitter 1 ( respectively of the receiver 2).

Therefore, all such modifications are intended to be incorporated within the scope of the appended claims.

Claims (12)

1. Induction energy transfer system comprising a transmitter (1) comprising a primary coupling module (11), a primary electronic module (12), and a first housing including upper (13) and lower (14) casings intended to be assembled to contain the primary coupling module (11) and the primary electronic module (12), characterized in that: - the upper casing (13) of the first housing comprises: o an upper wall (131) and, o at least one tab (134) disposed on the upper wall (131), the tab (134) extending outward perpendicularly to the upper wall (131) and including a hole , - the lower casing (14) of the first housing comprises: o at least one side wall (141), and o a plate (142) forming the bottom extending perpendicularly to said and at least one side wall (141), the plate (142) forming the bottom including at least one through opening, l the opening being intended to extend coaxially to a respective hole when the upper (13) and lower (14) casings are assembled, - The first housing further comprises at least one fixing element (15) including a threaded rod intended to be inserted into the through opening and the hole when the upper (13) and lower (14) casings are assembled, the length of the threaded rod being less than or equal to the height of the electronic module (12). 2. Induction energy transfer system according to claim 1, in which: - the upper casing (13) of the first housing comprises at least two peripheral tabs (134) arranged on the periphery of the upper wall (131), each peripheral tab (134) extending outward perpendicularly to the upper wall ( 131) and including a hole, the plate (142) forming the bottom of the lower casing (14) comprises at least two peripheral openings at its periphery, each peripheral opening being intended to extend coaxially to the hole of a respective peripheral tab (134) when the upper casings ( 13) and lower (14) are assembled. 3. Induction energy transfer system according to any one of claims 1 or 2, wherein the upper casing (13) of the first housing further comprises a peripheral skirt (132) extending outward perpendicularly to the upper wall (131), the upper wall (131) and the peripheral skirt (132) forming a housing for the coupling module. 4. Induction energy transfer system according to any one of claims 1 to 3, in which the plate (142) forming the bottom of the lower casing (14) and the side wall (141) of the lower casing (14) of the first housing constitute a housing for the electronic module (12). 5. Induction energy transfer system according to claim 2, in which the lower casing (14) of the first housing further comprises at least two grooves (144) formed in the side wall (141), each groove (144) being intended to cooperate with a respective peripheral tab (134) of the upper casing (13). 6. Induction energy transfer system according to claim 5, in which the cross-sectional shape of each groove (144) is complementary to the cross-sectional shape of its associated tab (134). 7. Induction energy transfer system according to any one of claims 5 or 6, in which the lower casing (14) of the first housing further comprises at least two protuberances (145) provided with passage lights arranged in the side wall (141), each projection (145) extending between the bottom and a respective groove (144). 8. Induction energy transfer system according to any one of claims 1 to 6, wherein the cross-sectional shape of each tab (134) is trapezoidal. 9. Induction energy transfer system according to any one of claims 1 to 7, in which the upper (13) and lower (14) casings have a hexagonal shape, the upper casing (13) including six legs (134 ), and the lower casing (14) including six side walls (141) and six grooves (144), the grooves (144) extending to the edges of the side walls (141) of the lower casing (14). 10. Induction energy transfer system according to any one of the preceding claims, in which: - the upper casing (13) of the first housing comprises a central tab arranged in a central region of the upper wall, the central tab extending perpendicular to the upper wall (131) and including a hole, the plate (142) forming the bottom of the lower casing comprises a central opening in a central region, the central opening being intended to extend coaxially to the hole in the central tab when the upper (13) and lower (14) casings are assembled. 11. Induction energy transfer system according to any one of the preceding claims, which further comprises a receiver (2) comprising a secondary coupling module (21), a secondary electronic module (22) and a second separate housing of the first case, the second case including an upper casing (23) and a lower casing (24): - the upper casing (23) of the second box comprising: o an upper wall (231) and a peripheral skirt (232) extending outward perpendicular to the upper wall (231), the upper wall (231) and the skirt (232) forming a housing for the coupling module (21), o at least one tab (234) disposed on the upper wall (231) and extending outward perpendicularly to the upper wall (231), the tab (234) including a hole, - the lower casing (24) comprising: 5 o a plate (242) forming the bottom including at least one through opening, the opening being intended to extend coaxially to the hole when the upper (23) and lower (24) casings are assembled, and o at least one side wall (241) extending outward perpendicular to the bottom plate (242), the plate (242) and the 10 side wall (241) forming a housing for the electronic module (22), the second housing further comprising at least one fixing element (25) including a threaded rod intended to be inserted into the through opening and the hole when the upper (23) and lower (24) housings are assembled, the length 15 of the threaded rod being less than or equal to a height of the electronic module (22).