Mat for the inductive charging of an electric vehicle and assembly comprising a charging station and such a mat

Abstract

A mat (102) for the inductive charging of an electric vehicle, intended to be placed in or on the ground and to be electrically connected to a charging station (101) itself electrically connected by wire to an electrical network, the charging mat (102) comprising a body (1, 2) carrying an electrical circuit, the latter comprising: - an inductor (3, 4) capable of generating a magnetic field for the inductive charging of the electric vehicle, and - a capacitor (5), forming with the inductor a resonant LC cell. (Shorthand figure: Fig. 4)

Description

Title of the invention: Mat for inductive charging of an electric vehicle and assembly comprising a terminal and such a mat

[0001] The present invention relates to a mat for inductive charging of an electric vehicle and an assembly comprising a terminal and such a mat.

[0002] The vehicle has, for example, a battery intended to power an electric machine for propelling the vehicle, this battery having a nominal voltage whose value may be 48V, or greater than 60V, being for example greater than 200V or 300V, being in particular 400V or 800V.

[0003] It is known to charge this battery inductively, also called "contactless", when the vehicle is stationary by means of an inductor arranged on or in the ground which exchanges electrical energy with an inductor in the vehicle's on-board network. In known solutions, it is necessary to provide, in association with this inductor, electronic components such as voltage converters and capacitors so that the inductor is powered so as to transmit the desired power level to the vehicle, this power level being for example between 3 kW and 50 kW. These components have a cost and also generate additional space, knowing that infrastructures for wired charging are already available.

[0004] There is a need to remedy these drawbacks.

[0005] The invention aims to meet this need, and it achieves this, according to one of its aspects, by means of a mat for the inductive charging of an electric vehicle, being intended to be placed in or on the ground and to be electrically connected to a charging terminal itself electrically connected by wire to an electrical network, the charging mat comprising a body carrying an electrical circuit, the latter comprising:

[0006] - an inductance capable of generating a magnetic field for the inductive load of the electric vehicle, and

[0007] - a capacitor, forming with the inductance a resonant LC cell.

[0008] According to the invention, the mat, through its cooperation with the charging terminal, can make it possible to minimize the presence in the mat of the components necessary for inductive charging of the vehicle. It is thus possible to reuse as much as possible for inductive charging the electronic components such as voltage converters or filters which are already provided in the charging terminal for wired charging of the vehicle. It is thus possible to facilitate inductive charging by making it possible as soon as a wired charging terminal is present and available.

[0009] The carpet can be placed on the floor, being rigidly fixed or not on the floor.

[0010] Alternatively, the mat may be laid in the ground, being completely buried or only partially buried.

[0011] The carpet may be rigid or flexible. According to the invention, “rigid” means that the carpet cannot be deformed without this deformation being irremediable, whereas “flexible” means that the carpet can be deformed and have the capacity to return to its initial shape when the stress that generated the deformation ceases.

[0012] The inductor and the capacitor are for example arranged in series in the electrical circuit of the carpet.

[0013] The mat may comprise a first sub-body carrying the inductance.

[0014] The inductance comprises for example a core, in particular made of ferrite, and an electrical winding, for example an electric wire, which can be arranged around this core. The ferrite core is for example confined between two parts of the first sub-body, these parts being for example stacked. The ferrite core is then fixed relative to the first sub-body.

[0015] Alternatively, the core of the inductor is made in a single piece with all or part of the first sub-body. According to this variant, this part of the first sub-body can be made of a magnetically charged material. This is for example magnetically charged plastic. The choice of the magnetic charge, its concentration and / or its distribution can make it possible to emulate for the core the behavior of a ferrite without ferrite being used, while giving more flexibility as to the choices of the form factor for the core. The production of this part of the sub-body and the core can for example be done in a single step, for example by overmolding on the electrical winding. If necessary, another part of the sub-body is associated with this production in a single piece of the core and a part of the first sub-body to form the first sub-body.If necessary, the entire first sub-body is made in one piece with the core using the magnetically charged material.

[0016] According to a first example of implementation, the first sub-body can also carry the capacitor.

[0017] According to this first example, the first sub-body can carry all the other possible components of the carpet, the first sub-body defining the body.

[0018] Alternatively, still according to this first example, the mat may comprise a second sub-body fixed to the first sub-body and different from the first sub-body. This second sub-body may, as will be seen later, carry other components of the mat. The fixing between the first sub-body and the second sub-body is for example removable, being for example carried out using screws. This example makes it possible, by having the resonant LC cell carried by a sub-body distinct from that carrying the other components of the mat such as an inverter and / or a rectifier, to be able to replace the resonant LC cell or these other components independently of each other. This reduces in particular the ecological cost of maintaining the mat or the cost of adapting it to a specific power level to be exchanged. Still according to this variant in which the mat comprises a second sub-body fixed to the first sub-body and different from the first sub-body, the second sub-body does not carry any components but provides functions of reinforcing the mat or gripping the mat, for example.

[0019] According to a second exemplary implementation, the capacitor is carried by the second sub-body, this second sub-body being fixed to the first sub-body and different from the first sub-body. According to this second example also, the fixing between the first sub-body and the second sub-body can be removable. This example allows the replacement of any component of the electrical circuit of the charging mat, other than the inductor, to be done without touching the inductor.

[0020] According to one or other of the aforementioned implementation examples, each sub-body can be produced by molding material. The components carried by each sub-body are for example encapsulated, in other words “entirely surrounded”, in the material of the sub-body, which can make it possible to confine acoustic noise in particular and to ensure watertightness. As already mentioned, these two sub-bodies can be screwed together.

[0021] The first sub-body and the second sub-body may be juxtaposed when the mat is placed in or on the ground. Considering the ground as defining a horizontal plane, a first and a second juxtaposed sub-body are offset horizontally. This juxtaposition may be done with or without overlap between the first and the second sub-body. This juxtaposition makes it possible to reduce the height of the load mat, which may be advantageous given the height available to accommodate the load mat, in particular when it is placed on the ground.

[0022] In this case, the first sub-body and the second sub-body may be directly adjacent. The interface between the first sub-body and the second sub-body may be a straight line or a broken line defining a convex or concave pattern. Any other form of interface is also possible, for example a curve or a form successively combining broken lines and curved lines. The interface is for example such that a portion of the first sub-body, respectively of the second sub-body, is surrounded, for example over 180° or more, by a portion of the second sub-body, respectively of the first sub-body.

[0023] Alternatively, the first sub-body and the second sub-body are not juxtaposed but are stacked when the carpet is laid in or on the floor. Still considering the floor as defining a horizontal plane, a first and a second stacked sub-body are vertically offset. Such stacking may allow reduce the width of the loading mat, which can be advantageous given the width available to accommodate the loading mat, particularly when it is placed in the ground.

[0024] In this variant, the capacitor is preferably carried by the second sub-body, the first sub-body carrying for example exclusively the inductance. It is however possible that the first sub-body also carries the capacitor according to this variant in which the first sub-body and the second sub-body are stacked.

[0025] Still in this variant, the first sub-body and the second sub-body may extend in parallel planes and / or have exactly the same shape. The stacking may correspond to an exact superposition or to a situation in which one of the sub-bodies extends beyond the other, for example.

[0026] In all of the above, the first sub-body may be made of a polymer plastic material such as PVC, plexiglass (PMMA) or even PBT or PPS. The material chosen is advantageously electrically non-conductive and magnetically non-conductive. The second sub-body may be made of one of these materials, for example the same as that of the first sub-body.

[0027] In all of the above, the electrical circuit carried by the mat is for example only constituted by the inductor and the capacitor which form a resonant LC cell. If necessary, a current sensor can also be part of the electrical circuit carried by the mat, this current sensor providing the value of the current flowing through the resonant LC cell. Such a mat is adapted to be electrically connected to a charging terminal already capable of supplying an alternating voltage in a wired manner to the vehicle, this alternating voltage being adapted and compatible for the power supply of the inductive cell for the exchange of electrical energy in an inductive manner.

[0028] Alternatively, in all of the above, the electrical circuit may comprise an inverter having a DC output, and an AC output, the resonant LC cell being connected to the AC output of the inverter. Such a mat is adapted to be electrically connected to a charging terminal capable of supplying a DC voltage in a wired manner to the vehicle. The DC output of the inverter is then electrically connected to the charging terminal.

[0029] In such a variant, the mat may also comprise a control module for the inverter, and a power supply for this control module. This power supply is in particular an electrical energy storage unit whose nominal voltage is 12V. The power supply of this electrical energy storage unit of the power supply is carried out for example from the charging terminal.

[0030] When an inverter is present in the electrical circuit of the mat, this inverter can be controlled to supply the resonant LC cell with an alternating current whose frequency is less than 5 kHz, for example less than 3 kHz, or even less than 2 kHz or 1 kHz, in particular still substantially equal to 400 Hz or 50 Hz. The invention can then allow low-frequency inductive charging, for example according to the teaching of the international application with filing number PCT / EP2023 / 059845 filed on 04 / 14 / 2023 by Valeo Equipements Electriques Moteur or of the application with filing number 2209978 filed on 09 / 30 / 2022 in France by Valeo Systèmes de Contrôle Moteur. Where appropriate, an alternating current in this frequency range is already available at the output of the charging terminal, when the electrical circuit of the mat does not have an inverter.

[0031] Alternatively, still when the inverter is present in the electrical circuit of the carpet, the latter can be controlled to supply the resonant LC cell with an alternating current whose frequency is of the order of 85 kHz or more.

[0032] When the inverter is present in the electrical circuit of the carpet, the latter can be carried by the second sub-body.

[0033] When the inverter is present in the electrical circuit of the mat, this electrical circuit may comprise a rectifier having a DC output capable of being electrically connected to the DC output of the inverter, and an AC output capable of being electrically connected to the charging terminal. Such a mat is adapted to be electrically connected to a charging terminal providing an alternating current which is not suitable for inductive charging. The cascade connection in the electrical circuit of the mat of a rectifier and an inverter can then make it possible to convert this alternating current available at the output of the charging terminal into an alternating current compatible with inductive charging.

[0034] When such a rectifier is present, it may be carried by the second sub-body. A control module for this rectifier may then be provided in the mat, being in particular carried by the second sub-body. Alternatively, the control of the rectifier is carried out by the control module of the inverter.

[0035] Alternatively, a rectifier may be provided, but it may be arranged elsewhere than in the mat, in an intermediate housing between the charging terminal and the mat. This rectifier may then be electrically connected between the charging terminal and the mat. Arranging the rectifier, and where appropriate an EMC filter associated with the latter, remotely from the charging terminal and from the mat, may increase the modularity of the mat. Indeed, when the charging terminal supplies a direct voltage, a mat whose electrical circuit is devoid of a rectifier may be directly electrically connected to this charging terminal. When the charging terminal supplies an alternating voltage, this same mat whose electrical circuit is without a rectifier can still be electrically connected to this charging terminal via the aforementioned remote rectifier.

[0036] When a rectifier is provided, whether it belongs to the mat, to an intermediate box, or otherwise, the mat can, in addition to what has been described above, be connected to a domestic electrical installation, for example to a residential or commercial premises electrical panel. This further increases the modularity of the charging mat.

[0037] When a rectifier is provided, whether it belongs to the mat, to an intermediate box, or otherwise, and as already mentioned, the inverter can be controlled to supply the resonant LC cell with an alternating current whose frequency is less than 5 kHz, for example less than 3 kHz, or even less than 2 kHz or 1 kHz, in particular still substantially equal to 400 Hz or 50 Hz, or be controlled to supply the resonant LC cell with an alternating current whose frequency is of the order of 85 kHz or more.

[0038] In all of the above, the carpet may comprise at least one of the following components, or even all of the following components:

[0039] - a wireless communication interface module with the vehicle,

[0040] - an EMC filter, and

[0041] - as already mentioned, a converter control circuit power supply

[0042] This or these components may be carried by the second sub-body.

[0043] For example, only the inductor and only the capacitor are carried by the first sub-body and all the other aforementioned components are carried by the second sub-body.

[0044] Alternatively, only the inductance is carried by the first sub-body, the capacitor and all the other aforementioned components being carried by the second sub-body.

[0045] In all of the above, when a sub-body of the charging mat carries an element such as the inductor, the capacitor, or a aforementioned component, this element can be rigidly fixed to said sub-body. This element is for example embedded in the sub-body or can protrude relative to the sub-body. The sub-body has for example a plate shape on which the elements are fixed.

[0046] In all of the above, the mat may comprise at least one connector for wired connection to the charging terminal. For example, one connector is present for transmitting a high voltage to the electrical circuit of the mat, and another connector is present for connection to the power supply of the control module when this power supply and this control module are worn by the body. If necessary, the connector may also allow an exchange of control signals between the charging terminal and the charging mat. If necessary, another connector may be present for connection to a domestic electrical installation, as already mentioned.

[0047] The invention also relates, according to another of its aspects, to an assembly for the inductive charging of an electric vehicle, comprising:

[0048] - a charging terminal capable of being electrically connected in a wired manner to a electrical network, and

[0049] - a charging mat as defined above.

[0050] The terminal comprises, for example, a housing and this housing can be mounted on a wall or on a mast. A contactor, a meter and an electrical circuit are, for example, housed in this housing.

[0051] This terminal is electrically connected to a wired network by an electric cable, the latter carrying for example a voltage with an effective value of 230V and a frequency of 50Hz. This voltage can be single-phase or three-phase. Other voltages are possible, for example a single-phase voltage with an effective value of 120V and a frequency of 60Hz, a two-phase voltage with an effective value of 208V and a frequency of 60Hz or a three-phase voltage of 240V and a frequency of 60Hz. Other examples are possible.

[0052] The electrical cable is preferably connected to an electrical network, for example a regional or national electrical network. Alternatively, it may be an independent local network, for example comprising one or more batteries powered by energy sources such as wind turbines, solar panels, fuel cells or hydroelectric generators.

[0053] The invention also relates, according to another of its aspects, to a method of providing an assembly for the inductive charging of an electric vehicle in which:

[0054] - a charging mat is electrically connected to an electrically connected charging terminal connected by wire to an electrical network, the charging mat comprising a body carrying an electrical circuit, the latter comprising: an inductance capable of generating a magnetic field for the inductive charging of the electric vehicle, and a capacitor, forming with the inductance a resonant LC cell.

[0055] The method may comprise the step of placing the load mat in or on the ground.

[0056] Alternatively, the charging mat may be permanently placed in or on the ground.

[0057] The invention may be better understood by reading the following description. of non-limiting examples of its implementation and upon examination of the attached drawing in which:

[0058] [Fig.l] schematically represents an assembly according to an exemplary implementation of the invention comprising a charging terminal and a mat placed on the ground

[0059] [Fig.2] differs from [Fig.l] in that the carpet is laid in the ground, being partially buried,

[0060] [Fig.3] differs from [Fig.l] in that the carpet is laid in the ground, being entirely buried,

[0061] [Fig.4] is an example of an embodiment in which the carpet has a first sub-body and a second sub-body which are juxtaposed,

[0062] [Fig.5] is a variation of the example of [Fig.4]

[0063] [Fig.6] represents a top view of a carpet according to an embodiment in which the first sub-body and the second sub-body are stacked,

[0064] [Fig.7] represents a bottom view of the carpet according to the embodiment of [Fig.6],

[0065] [Fig.8] represents a sectional view along AA of figures 6 and 7, and

[0066] [Fig.9] represents a variant of the embodiment of figures 4 and 5, in which the carpet has a first sub-body and a second sub-body which are juxtaposed.

[0067] [Fig.l] shows an assembly 100 for the inductive charging of an electric vehicle. This assembly 100 comprises a charging terminal 101 capable of being electrically connected by wire to an electrical network, and a charging mat 102 shown very schematically in Figures 1 to 3.

[0068] In the example considered, the terminal 101 comprises a housing 103 which is here mounted on a mast 104. In another example not shown, the housing 103 could be mounted on a wall. The housing 103 contains conventional components of a charging terminal, such as a contactor, a meter and an electrical circuit.

[0069] Terminal 101 is electrically connected to a wired network by an electric cable, the latter carrying for example a voltage with an effective value of 230V and a frequency of 50Hz. This voltage can be single-phase or three-phase.

[0070] In [Fig.l], the loading mat 102 is placed on the ground. The loading mat 102 is for example held on the ground by its own weight or by a removable fixing. Alternatively, it is permanently mounted on the ground.

[0071] In [Fig.2], the charging mat 102 is laid in the ground, being partially buried in the ground whereas in [Fig.3], the charging mat is completely buried in the ground.

[0072] The mat 102 of Figures 1 to 3 may be rigid or flexible.

[0073] The mat 102 of Figures 1 to 3 is electrically connected to the charging terminal 101 by a wired connection, although this connection is not shown. This wired connection implements a power connection 12 to provide the power signal necessary for charging and, where appropriate, a control connection to provide the control signal necessary for the voltage converter(s) embedded in the charging mat 102, when such a converter(s) are present in the charging mat 102. This control connection may be a low voltage power supply, for example a direct voltage of 12V.

[0074] We will now describe with reference to figures 4 to 9 different examples of embodiment of charging mat 102 according to the invention.

[0075] In these examples, the charging mat 102 has a body carrying an electrical circuit. In all the examples described, the electrical circuit comprises at least one inductor capable of generating a magnetic field for the inductive charging of the electric vehicle, and a capacitor 5, forming with the inductor a resonant LC cell. The inductor is here formed by a core 4, in particular made of ferrite or magnetically charged plastic, and an electrical winding 3, for example an electrical wire wound around the core or electrically conductive tracks. Other ways of producing the inductor are covered by the invention.

[0076] The inductance 3, 4 and the capacitor 5 are here arranged in series.

[0077] In these described examples, and although this is not limiting, the body is made of two parts, with a first sub-body 1 and a second sub-body 2.

[0078] These first 1 and second sub-bodies 2 are here distinct and fixed to each other, by a removable or non-removable fixing. The first sub-body 1 is for example made of a polymer plastic material such as PVC, plexiglass (PMMA) or even PBT or PPS. The second sub-body 2 is in the example considered in one of these materials, for example in the same as that of the first sub-body 1. When the core 4 is made of magnetically charged plastic, the core 4 and all or part of the first sub-body 1 can be made in a single piece, for example by overmolding on the electrical winding 3.

[0079] As will be seen below with reference to Figures 4, 5 and 9, the first sub-body 1 and the second sub-body 2 may be juxtaposed when the carpet is placed in or on the ground. Alternatively, and as will be seen below with reference to Figures 6 to 8, the first sub-body 2 and the second sub-body 3 may be stacked when the carpet 102 is placed in or on the ground.

[0080] Regardless of how the first sub-body 1 and the second sub-body 2 are arranged relative to each other, the first sub-body 1 can carry both the inductor and the capacitor 5, or carry only the inductor, the capacitor 5 then being carried by the second sub-body.

[0081] The invention is not limited to the example in which the electrical circuit of the charging mat would be solely constituted by the resonant LC cell.

[0082] The electrical circuit of the mat 102 may further comprise an inverter 6 having a DC output electrically connected to the charging terminal 101, and an AC output connected to the resonant LC cell. The mat may then integrate a control module 7 of the inverter 6, and a power supply 11 of this control module 7. The power supply 11 is in the examples considered connected to the control module 7 by a connection 13 being an electric wire, a bus bar rigid or a printed circuit board track, for example. This power supply is here a battery whose nominal voltage is 12V and which is charged from the charging terminal 101 via the control connection, or a voltage source made using this control connection.

[0083] The control module 7 can control the electronic switches of the inverter 6, the latter being for example MOS or IGBT transistors so as to generate an alternating current whose frequency is less than 5 kHz, for example less than 3 kHz, or even less than 2 kHz or 1 kHz, in particular still substantially equal to 400 Hz or 50 Hz, to power the resonant LC cell. The control of the inverter 6 by the control module 7 is carried out by a connection 15, being for example an electric wire, a rigid bus bar or a printed circuit board track, for example. It is also possible to use to make the connection 15 a Bal Spring® type solution marketed by the company Bal Seal Engineering™.

[0084] When the inverter 6 is on board the charging mat 102, the electrical circuit can also comprise a rectifier 9, as well as, if necessary, an EMC filter 10, the latter making it possible to process the common mode current and the differential mode current upstream of the alternating current output of the rectifier 9. The switches of the rectifier 9, when they are controllable, can then be controlled by the control module 7, or by a control module dedicated to the rectifier 9.

[0085] Where appropriate, the body also carries a module 8 for wireless communication interface with the vehicle and a connection 14, for example wired, allowing the exchange of data between this module 8 for wireless communication interface and the aforementioned control module 7.

[0086] The junction of the rest of the electrical circuit carried by the body with the resonant LC cell is carried out for example via two respective wires 16 and 17 or via two rigid bus bars, for example.

[0087] In the example of figures 4 and 5, the first sub-body 1 and the second sub-body 2 are juxtaposed.

[0088] It can be seen that, in the example of [Fig.4], the interface between the first sub-body 1 and the second sub-body 2 is a succession of broken lines defining a concave pattern. This concave pattern is such that the portion of the first sub-body 1 carrying the inductance 3, 4 is surrounded over more than 180° by the second sub-body 2. The components carried by the second sub-body 2 are here arranged one after the other along a part of the periphery of the inductance 3, 4.

[0089] It can also be seen in [Fig. 4] that the first sub-body 1 here only carries the inductance 3, 4 and the capacitor 5, while the inverter 6, its control module 7, the rectifier 9, the EMC filter 10, the power supply 11 of the control module 7, and the module 8 for wireless communication interface with the vehicle are carried by the second sub-body 2.

[0090] The variant of [Fig.5] differs from what is shown in [Fig.4] by the fact that the capacitor 5 is carried by the second sub-body 2 and by the shape of the interface between the first sub-body 1 and the second sub-body 2 which is here a straight line. In [Fig.5], the first sub-body 1 carries only the core 4 and the electrical winding 3 of the inductance.

[0091] The variant of [Fig. 9] differs from that of figures 4 and 5 by the fact that the rectifier 9 and the EMC filter 10, although present, are neither in the mat 102 nor in the terminal 101. They are here received in an intermediate housing 18, electrically connected to the charging terminal 101 by the power connection 12 and to the charging mat 102 by a power connection 19, these connections 12 and 19 being here wired. As can be seen, a control connection also exists between the power supply 11 and the housing 18 for controlling the electronic switches of the rectifier 9. In this variant of [Fig. 9], the capacitor 5 is carried by the second sub-body 2 and the interface between the first sub-body 1 and the second sub-body 2 is a straight line. In a variant of what is shown in [Fig.9], the capacitor 5 could be carried by the first sub-body 1 and the interface between the first sub-body 1 and the second sub-body 2 could define a concave pattern, similarly to what has been represented in [Fig.4].

[0092] In the example of Figures 6 to 8, the first sub-body 1 and the second sub-body 2 are stacked, as is apparent in [Fig. 8]. It can be seen in [Fig. 8] that the first sub-body 1 and the second sub-body 3 can have identical shapes, and be stacked so as to have an exact superposition. Still in the example of Figures 6 to 8, the capacitor 5 is carried by the second sub-body 2, so that the first sub-body 1 only carries the inductance. In a stacking variant not shown, the capacitor 5 is also carried by the first sub-body 1.

[0093] The invention is not limited to what has just been described.

[0094] For example, whether or not the rectifier 9 and / or the inverter 6 is present in the circuit electrical current of the charging mat 102, the inductance 3, 4 can be traversed by an alternating current whose frequency is of the order of 85 kHz or more.

[0095] In another example not described, the inductance is contained in two different sub-bodies: a sub-body which encapsulates or not the core 4 and another sub-body which encapsulates or not the electrical winding 3. One of these sub-bodies carries, where appropriate, the capacitor 5 or the capacitor 5 is carried by yet another sub-body.

Claims

Claims

1. Mat (102) for the inductive charging of an electric vehicle, being intended to be placed in or on the ground and to be electrically connected to a charging terminal (101) itself electrically connected by wire to an electrical network, the charging mat (102) comprising a body (1, 2) carrying an electrical circuit, the latter comprising: - an inductance (3, 4) capable of generating a magnetic field for the inductive charging of the electric vehicle, and - a capacitor (5), forming with the inductance a resonant LC cell.

2. A mat according to claim 1, the body comprising a first sub-body (1) carrying the inductance (3, 4).

3. A carpet according to claim 2, the body comprising a second sub-body (2) attached to the first sub-body (1) and different from the first sub-body (1).

4. A mat according to claim 2 or 3, the first sub-body (1) also carrying the capacitor (5).

5. A mat according to claim 3, the second sub-body (2) carrying the capacitor (5).

6. A mat according to any one of claims 3 to 5, the first sub-body (1) and the second sub-body (2) being juxtaposed when the mat (102) is laid in or on the ground.

7. A carpet according to claim 6, the first sub-body (1) and the second sub-body (2) being directly adjacent.

8. A mat according to claim 7, the interface between the first sub-body (1) and the second sub-body (2) being a straight line or a broken line defining a convex or concave surface.

9. A mat according to any one of claims 2 to 5, the first (1) and second (2) sub-bodies being stacked when the mat (102) is laid in or on the ground.

10. A carpet according to any one of claims 3 to 9, the first sub-body (1) and / or the second sub-body (2) being made of a polymer plastic material

11. Carpet according to any one of the preceding claims, the electrical circuit comprising a current sensor, this current sensor providing the value of the current flowing through the resonant LC cell.

12. A mat according to any preceding claim, the circuit electrical system comprising an inverter (6) having a direct current output and an alternating current output, the resonant LC cell being connected to the alternating current output of the inverter (6).

13. Carpet according to claim 12, the inverter (6) being controlled to generate an alternating current whose frequency is less than 5 kHz, for example less than 3 kHz, or even less than 2 kHz or 1 kHz, in particular still substantially equal to 400 Hz or 50 Hz.

14. A mat according to any one of claims 3 to 10 and claim 12 or 13, the second sub-body (2) carrying the inverter (6).

15. A mat according to any one of claims 12 to 14, the electrical circuit comprising a rectifier (9) having a DC output capable of being electrically connected to the DC output of the inverter (6) and an AC output capable of being electrically connected to the charging terminal (101).

16. A mat according to claim 15, and any one of claims 3 to 10, the second sub-body (2) carrying the rectifier (9).

17. Mat according to any one of the preceding claims, comprising at least one of the following components: - a module (8) for wireless communication interface with the vehicle, - an EMC filter (10) - a converter control circuit power supply (11)

18. Carpet according to the preceding claim and any one of claims 3 to 10, the second sub-body (2) carrying said component (8, 10, 11).

19. Assembly (100) for inductive charging of an electric vehicle, comprising: - a charging terminal (101) capable of being electrically connected by wire to an electrical network, and - a charging mat (102) according to any one of the preceding claims.

20. Method for providing an assembly for the inductive charging of an electric vehicle in which: - a charging mat (102) is electrically connected to a charging terminal (101) electrically connected in a wired manner to an electrical network, the charging mat (102) comprising a body (1, 2) carrying an electrical circuit, the latter comprising: an inductance (3, 4) capable of generating a magnetic field for the inductive charging of the vehicle electric, and a capacitor (5), forming with the inductance a resonant LC cell.

21. A method according to claim 20, comprising the step of placing the load mat (102) in or on the ground.

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