Ground pad module with sensor structure - Patent application

Abstract

The present invention relates to a Ground Pad Module (GPM) for wireless charging of a battery in an electric vehicle, the GPM comprising power discharging means, in particular embodied as a coil, configured to supply an electrical output to a Car Pad Module (CPM) equipped in the electric vehicle and configured to charge the battery, the GPM being configured to inductively transmit the electrical output from the GPM to the CPM, and a sensor arrangement, in particular for detecting at least one of an object, a living being and a relative position between the CPM and the GPM, made at least partially from metal, the sensor arrangement being configured to conduct at least one of a sensed current, a measured induced current and a voltage, the sensor arrangement comprising a foil as a base substrate, in particular as an insulating flexible substrate, a plurality of sensors and a connection cable printed on the foil, the sensors being configured to realize object detection, in particular by means of screen printing of a conductive ink, in particular at least one of silver and copper inks.

Description

FIELD OF THE INVENTION

[0001]

[0001] The present invention relates to a ground pad module for wirelessly charging a battery of an electric vehicle.

[0002] Alternating current (AC) charging for electric vehicles is crucial for residential and semi-public / public urban areas. A typical AC charger can provide up to 22 kW of charging power. AC charging systems can be divided into wired and wireless charging systems, with wireless charging systems primarily embodied as inductive charging systems (ICS). Inductive charging systems typically include two separate modules, often referred to as a ground pad module (GPM) and a car pad module (CPM). The ground pad module is installed outside the electric vehicle, while the car pad module is installed inside the electric vehicle. Electromagnetic interaction between the ground pad module and the car pad module enables energy transfer from the ground pad module to the car pad module, which is then used to charge the electric vehicle's battery. Wireless charging systems are often more convenient for users because they typically do not require manual intervention by the driver to initiate the battery charging process. On the other hand, wired charging systems require users to connect the electric vehicle to the power grid using a cable.

[0003]

[0003] If other objects, especially metal objects or humans, are present near the ground pad module or car pad module during wireless charging, there is a risk of overheating or burning. Therefore, inductive charging systems are typically equipped with object detection means, especially metal object and / or living organism detection means, for detecting objects near the ground pad module or car pad module. If an object is detected, wireless charging can be stopped. In state-of-the-art ground pad modules, such object detection is often performed using field-based detection methods that detect the presence of an object using changes in inductance, resistance, or capacitance (or derived quantities). Field-based detection methods can be divided into inductive object detection methods and capacitive object detection methods. Inductive object detection methods are based on detecting changes in inductance due to the presence of a foreign object near the ground pad module / car pad module. Inductive object detection is typically achieved by a detection coil array positioned above the transmitter of the ground pad module. Capacitive object detection methods are based on detecting changes in capacitance due to the presence of a foreign object near the ground pad module / car pad module.

[0004]

[0004] State-of-the-art inductive object detection methods can be divided into passive inductive detection methods and active inductive detection methods. Passive inductive detection methods use the magnetic field generated by the ground pad module to transmit power to the car pad module. This magnetic field induces a voltage in the object detection array, and changes in the magnetic field due to foreign objects are reflected in changes in the induced voltage. On the other hand, in active inductive detection methods, a detection field is generated by the detection array, and changes in the field due to metal objects / living things are detected. State-of-the-art detection arrays are mounted on a printed circuit board (PCB). Objective of the Invention

[0005] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a ground pad module having a sensor arrangement for detecting metallic objects / living things in the vicinity of the ground pad module or a corresponding car pad module.

[0006]

[0006] This object is achieved by the characterizing features of the independent claims. Features which further develop the invention in an alternative or advantageous manner are set out in the dependent patent claims. Summary of the Invention

[0007]

[0007] The present invention relates to a ground pad module (GPM) for wirelessly charging a battery in an electric vehicle, comprising: a power dissipation means, particularly embodied as a coil, configured to supply an electrical output to a car pad module (CPM) provided in the electric vehicle and configured to charge the battery, and configured to inductively transmit the electrical output from the GPM to the CPM; and a sensor arrangement, particularly for detecting at least one of an object, a living being, and the relative position between the CPM and the GPM, made at least partially from metal, the sensor arrangement being configured to conduct at least one of a sensed current, a measured induced current, and a voltage, the sensor arrangement comprising a foil as a base substrate, particularly as an insulating flexible substrate, a plurality of sensors and connection cables printed on the foil, and the sensors are configured to achieve object detection, particularly using screen printing of a conductive ink, particularly at least one of silver ink and copper ink.

[0008]

[0008] Sensor structures implemented on foils are more flexible and require less construction effort than state-of-the-art sensor structures implemented on PCBs. Therefore, the flexibility of, for example, PET or Kapton foils allows for more flexible positioning of such inventive sensor structures compared to state-of-the-art sensor structures, so that the sensor structures on foils can be better integrated into ground pad modules. Silver ink can be electrically beneficial due to its very good electrical conductivity. The temperature "dependence" of flexible loop arrays offers significant advantages for silver ink. Commercially available silver inks have a temperature coefficient of 0.0543 Ω / °C (see www.mdpi.com / 2076-3417 / 8 / 11 / 2101 / pdf), whereas copper has a temperature coefficient of 0.004041 Ω / °C (see www.allaboutcircuits.com / textbook / direct-current / chpt-12 / temperature-coefficient-resistance). In general, the sensor can be used to measure heated objects by increasing their resistance. The higher temperature coefficient of the printed loop array enhances sensitivity.

[0009]

[0009] In some embodiments, the ground pad module comprises a cover sheet, particularly embodied as a glass fiber cover sheet and particularly having a rectangular shape, and the foil is attached to the cover sheet, particularly by at least one of baking, pressing, and gluing.

[0010]

[0010] The cover sheet may comprise a material GF70* having beneficial temperature properties. The cover sheet may protect the ground pad module from above, i.e., may shield the power discharge means from above, for example, to protect the power discharge means from a vehicle accidentally driving over the ground pad module. The foil may be fixedly attached to the cover sheet, and the fixed attachment may be achieved by baking and pressing.

[0011]

[0011] In some embodiments, the GPM includes a further sensor arrangement having a further foil having a further plurality of sensors and a further connecting cable, the further plurality of sensors and the further connecting cable being printed on the further foil, particularly by screen printing of at least one of silver ink and copper ink, the further plurality of sensors being configured to achieve object detection, and the further foil being attached to the cover sheet, particularly by at least one of baking, pressing, and gluing.

[0012]

[0012] Thus, the ground pad module may comprise two separate sensor arrangements, both of which may provide the same functionality but are realized on two separate foils, i.e., both of which may be used to detect metal objects or living organisms in the vicinity of the ground pad module or the car pad module.

[0013]

[0013] In some embodiments, the foil comprises a connecting strip, in particular an L-shaped connecting strip, or respectively the further foil comprises a further connecting strip, in particular an L-shaped further connecting strip, and the plurality of sensors or respectively the further plurality of sensors are electrically connected to separate components of the GPM via the connecting strip or respectively the further connecting strip, and the connecting cable or respectively the further connecting cable is routed from the connecting strip or respectively the further connecting strip to the plurality of sensors or respectively the further plurality of sensors, and individual sensors of the plurality of sensors or respectively the further plurality of sensors can be accessed via the connecting strip or respectively the further connecting strip.

[0014]

[0014] Such a connecting strip can provide a compact interface for contacting the sensors of the sensor arrangement. The connecting strip, as well as the further connecting strips, can be bent, thereby providing a flexible and compact interface by which the sensor arrangement and / or further sensor arrangements can be connected in situ to other components of the ground pad module.

[0015]

[0015] In some embodiments, the connecting strip and the further connecting strip are separated from the cover sheet, and the foil and the further foil are arranged on the cover sheet so that the connecting strip is substantially arranged on the further foil and the further connecting strip is substantially arranged on the foil, and the connecting strip and the further connecting strip are bent away from the further foil or the foil, respectively, particularly at substantially 90 degrees relative to the cover sheet.

[0016]

[0016] The connecting strip and the further connecting strip can therefore be movable even after the foil and the further foil have been fixedly attached to the cover sheet.

[0017]

[0017] In some embodiments, the connecting strip and the further connecting strip are laterally displaced from each other.

[0018]

[0018] Lateral displacement may be understood to refer to the underlying geometric shape of the cover sheet. If the cover sheet is, for example, rectangular, lateral displacement may refer to displacement along at least one of two directions corresponding to the edges of the cover sheet.

[0019]

[0019] In some embodiments, at least one of the connection strip and the further connection strip is inserted into a receiving slot of a separate component of the GPM, in particular into a receiving slot of a PCB comprising at least one of the processing unit and the control unit.

[0020]

[0020] The operation of the sensor arrangement may be synchronized with the operation of the power emitting means, and if a metal object or a living thing is detected near the ground pad module or the car pad module, the operation of the power emitting means may be automatically reduced or stopped.

[0021] In some embodiments, at least one of the sensor arrangement and the further sensor arrangement is positioned between the cover sheet and the power dissipation means.

[0022]

[0022] In some embodiments, at least one of the sensor arrangement and the further sensor arrangement is positioned on the opposite side of the cover sheet from the power discharge means, and the cover sheet is provided with a hole through which at least one of the connecting strip and the further connecting strip passes.

[0023]

[0023] A sensor structure printed on foil can be flexible. If such a sensor structure is positioned on top of a cover sheet, a vehicle that may accidentally drive over a ground pad module equipped with such a sensor structure may be less likely to damage the entire ground pad module than if the ground pad module were equipped with a rigid PCB on which the sensor structure is implemented, and the rigid PCB was placed on top of the cover sheet. Thus, a sensor structure printed on foil offers greater positioning flexibility compared to state-of-the-art sensor structures.

[0024]

[0024] In some embodiments, the cover sheet has a cover sheet spatial extent, the foil and further foil have a foil spatial extent and a further foil spatial extent, respectively, and the ratio of the foil spatial extent to the cover sheet spatial extent, or the foil spatial extent + further foil spatial extent to the cover sheet spatial extent, is less than 0.9, in particular less than 0.5.

[0025]

[0025] The sensor arrangement can therefore be smaller than the cover sheet, and the size of the sensor arrangement can therefore be adapted to the size and emission behaviour of the power emitting means.

[0026]

[0026] In some embodiments, the power emitted by the power emission means is emitted substantially through the emission area, and the foil, or foil plus further foil, is at least as large as the emission area and is positioned within the emission area.

[0027] The emission area may be a plane through which passes most of the electromagnetic energy transmitted from the ground pad module to the car pad module.

[0028]

[0028] In some embodiments, at least one of the plurality of sensors and the further plurality of sensors is embodied as a loop sensor and is arranged in a two-dimensional array on the foil or on the respective further foil.

[0029]

[0029] In some embodiments, at least one of (a) the sensor and the connecting cable and (b) the further sensor and the further connecting cable are printed in layers on the foil or, respectively, on the further foil, and at least one insulating layer is printed on the foil or, respectively, at least one further insulating layer is printed on the further foil.

[0030]

[0030] The insulating layer may be used to separate the connecting cables from one another, and gaps in the insulating layer may be used, for example, to selectively connect the connecting cables to one another at specific points.

[0031]

[0031] In some embodiments, the GPM includes a drive-over ramp, a cover sheet inserted into a recess in the drive-over ramp on all sides, the cover sheet attached to the drive-over ramp, particularly by a tongue and groove mounting mechanism, and the cover sheet being particularly non-flat and having a bent section near the drive-over ramp.

[0032]

[0032] The cover sheet is flat in the central region in which the sensor arrangement is located and can be bent near the drive over ramp. Due to the flexibility of the sensor arrangement printed on the foil, such a sensor arrangement can also be positioned on the bent section of the cover sheet, thereby providing a more flexible installation and a larger detection area.

[0033]

[0033] The present invention further relates to a method for manufacturing a GPM as described in this specification, said method including the step of printing a plurality of sensors and connecting cables onto a foil using screen printing of a conductive ink, particularly at least one of silver ink and copper ink. [Brief explanation of the drawings]

[0034]

[0034] The system of the invention will now be described in more detail, purely by way of example, using specific exemplary embodiments shown diagrammatically in the drawings, in which identical elements are provided with the same reference numerals, and further advantages of the invention will be considered.

[0035] [Figure 1] FIG. 1 shows a schematic diagram of a sensor arrangement according to the present invention.

[0036] [Figure 2] FIG. 2 shows a further schematic diagram of a sensor arrangement according to the invention.

[0037] [Figure 3]

[0037] Figure 3 shows a schematic view of a cover sheet to which a sensor arrangement according to the invention and a further sensor arrangement are attached.

[0038] [Figure 4a] FIG. 4a shows a schematic diagram of one possible positioning of a sensor arrangement according to the invention on a cover sheet. [Figure 4b] FIG. 4b shows a schematic diagram of another possible positioning of the sensor arrangement according to the invention on the cover sheet.

[0039] [Figure 5] FIG. 5 shows a schematic diagram of a drive overlamp having a cover sheet on which the sensor arrangement of the present invention is mounted.

[0040] [Figure 6] FIG. 6 shows a schematic diagram of the connection mechanism with the cover sheet connected to the drive overramp.

[0041] [Figure 7a] FIG. 7a shows a schematic diagram of a possible spatial arrangement of the components of a ground pad module. [Figure 7b] FIG. 7b shows a schematic diagram of a possible spatial arrangement of the components of the ground pad module.

[0042] [Figure 8] FIG. 8 shows a schematic diagram of the ground pad module without the sensor assembly and cover sheet. Detailed Description of the Drawings

[0043]

[0043] Figure 1 shows a schematic diagram of a sensor arrangement 3' according to the invention, particularly for detecting metal objects and / or living organisms, which sensor arrangement 3' is part of a ground pad module for wirelessly charging the battery of an electric vehicle.

[0044] The sensor assembly 3' comprises a foil 4' and a plurality of sensors 5' and connecting cables 6' printed on the foil 4' using screen printing, particularly with silver and / or copper ink. The foil 4' may be embodied, for example, as a PET foil or a Kapton foil. The foil 4' may be more flexible and resilient than a state-of-the-art PCB. Thus, an electric vehicle accidentally driving over the foil 4' may be less likely to damage the foil 4' than it would be if it were driving over a state-of-the-art PCB containing a detection array.

[0045] The sensors 5' in FIG. 1 are rectangular sensors arranged in a two-dimensional array pattern. Each sensor 5' is connected by a connecting cable 6' to a connecting strip 8', which provides an interface for connecting the sensor assembly 3' to other components of the ground pad module, particularly a control and / or processing unit. Each sensor 5' can record changes in the magnetic field due to the presence of a foreign object, particularly a metal object or a living organism. The individual connecting cables 6' can be isolated from each other using an insulating layer between the connecting cables 6'.

[0046]

[0046] Figure 2 shows a schematic diagram of a sensor arrangement 3' according to the invention. In Figure 2, a rectangular array of sensors 5' and a connecting strip 8' are shown. The connecting strip 8' is embodied as an L-shaped connecting strip, which is bendable so that after bending, the connecting strip 8' is perpendicular to the foil 4', as shown in Figure 2.

[0047]

[0047] Figure 3 shows a schematic diagram of a cover sheet 7 to which a sensor component 3' and a further sensor component 3" are attached. The cover sheet 7 is larger than the sensor component 3' and the further sensor component 3" combined. The sensor component 3' and the further sensor component 3" can be attached to the cover sheet 7 in such a way that the foils 4', 4" are positioned on the cover sheet 7 such that the L-shaped connecting strip 8' of the sensor component 3' lies on the further foil 4" of the further sensor component 3", and the L-shaped connecting strip 8" of the further sensor component 3" lies on the foil 4' of the sensor component 3'. Due to the baking process, the foil 4' and the further foil 4" can be attached to the cover sheet 7, while the connecting strip 8' and the further connecting strip 8" are not in contact with the cover sheet 7 and are therefore not attached to the cover sheet 7 after baking. After baking, the connecting strip 8' and the further connecting strip 8" can be bent, for example, so that the connecting strip 8' and the further connecting strip 8" are perpendicular to the cover sheet 7. The sensor arrangement 3' and the further sensor arrangement 3'' may provide the same detection function.

[0048]

[0048] Figures 4a and 4b show schematically different possible positionings of the sensor arrangement 3' on the cover sheet 7. Other positionings are also feasible, especially in combination with a further sensor arrangement 3" (not shown in Figures 4a and 4b). The sensor arrangement 3' may be positioned on the cover sheet 7 so as to cover the emission area of ​​a power emission means used to transmit power from the ground pad module to the car pad module. The emission area may be an area through which most of the transmitted power passes. Also, the sensor arrangement 3', or the sensor arrangement 3' and the further sensor arrangement 3" may be larger than the emission area. The sensor arrangement 3' may be positioned on the cover sheet 7 so as to be spatially aligned with the power emission means of the ground pad module.

[0049]

[0049] Figure 5 shows schematically a drive over ramp 9 with a cover sheet 7 attached and with a sensor arrangement 3' and a further sensor arrangement 3" fixedly arranged on the cover sheet 7. The connecting strip and the further connecting strip are bent away from the cover sheet 7 and are at an angle of approximately 90 degrees to the cover sheet. Figure 5 shows the drive over ramp 9 as seen from below, i.e. from the side facing the ground when the ground pad module is installed with the side facing away from the ground.

[0050]

[0050] Figure 6 shows a schematic diagram of a connection mechanism for connecting the cover sheet 7 to the drive overramp 9. The cover sheet 7 can be connected to the drive overramp 9 by a tongue-and-groove attachment mechanism. The drive overramp 9 can have a recess 10 into which the cover sheet 7 can be inserted, and the portion of the cover sheet 7 inserted into the recess 10 can contact the drive overramp 9 on at least two sides. The cover sheet 7 itself can be bent so that the portion of the cover sheet 7 on which the sensor component 3' is located is attached flush with the edge of the drive overramp 9. The cover sheet 7 can also be attached to the drive overramp 9 on all sides by such an attachment mechanism. Alternatively, the sensor component 3' of the present invention can be positioned on the bent portion of the cover sheet 7. While state-of-the-art sensor components realized on a PCB can be difficult to position on the bent portion of the cover sheet 7, a sensor component 3' realized on a flexible foil can be more easily positioned on the bent section of the cover sheet 7.

[0051] 7a and 7b show a schematic front view of a possible spatial arrangement of the components of the ground pad module 1. Using external connections 13 to the ground pad module 1, the ground pad module 1 can be connected to a power grid from which electrical power can be drawn. The ground pad module 1 of FIGS. 7a and 7b includes drive over ramps 9 on all sides of the ground pad module 1 and a ground cover 14 that can enclose the ground pad module 1 from below. The drive over ramps 9 and the ground cover 14 can be connected. The ground pad module 1 includes a power discharging means 2, particularly embodied as a coil for transmitting electromagnetic radiation, and electronics necessary to control the emission of electromagnetic radiation. Other components 12 of the ground pad module 1 may only indirectly participate in the power discharging process, and in particular, equipment for cooling the ground pad module may be positioned separately from the power discharging means 2 within the ground pad module 1. The sensor structure 3′ can be positioned above the power discharging means 2 and, for example, be larger than or equal to the size of the power discharging means 2. The sensor construction 3' can be positioned below (FIG. 7a) or above (FIG. 7b) the cover sheet 7, which can completely cover the ground pad module 1 from above. If the sensor construction 3' is positioned above the cover sheet 7, the cover sheet 7 can be provided with openings through which the connection strips of the sensor construction 3' are led. A design foil 11 can be positioned on the top surface of the cover sheet 7 (FIG. 7a) or on the top surfaces of the cover sheet 7 and the sensor construction 3'. Thus, the sensor construction 3' of the present invention can be positioned at different locations within the ground pad module 1 due to the resulting flexible behavior of the flexible foil realized on the flexible foil.

[0052] 8 shows a schematic diagram of the ground pad module 1 without the sensor structure 3' of the present invention and without the cover sheet 7. The ground pad module 1 may include external connections 13 through which it can receive electrical power from a power system, a power dissipation means 2, and other components 12, such as components for cooling the ground pad module 1 and a drive over lamp 9. The sensor structure 3' of the present invention is positioned above the power dissipation means 2, while the cover sheet 7 is positioned above both the power dissipation means 2 and the other components 12 of the ground pad module 1.

[0053] It goes without saying that the figures shown are merely schematic diagrams of possible exemplary embodiments.

[0054]

[0054] While the present invention has been illustrated above in part with reference to certain preferred embodiments, it will be understood that numerous modifications and combinations of the various features of the embodiments can be made, all of which fall within the scope of the appended claims. [Item of invention] [Item 1] A ground pad module (GPM) (1) for wirelessly charging a battery in an electric vehicle, the GPM comprising: a power dissipation means (2), particularly embodied as a coil, configured to provide an electrical output to a car pad module (CPM) provided in the electric vehicle and configured to charge the battery, the CPM being configured to inductively transfer the electrical output from the GPM to the CPM; a sensor arrangement (3') for detecting at least one of an object, a living organism, and a relative position between the CPM and the GPM, the sensor arrangement (3') being at least partially made of metal, the sensor arrangement (3') being configured to conduct at least one of a sensed current, a measured induced current, and a voltage; A ground pad module (GPM) (1) comprising: The sensor structure is a foil (4') as a base substrate, in particular as an insulating flexible substrate, a plurality of sensors (5') and connecting cables (6') printed on said foil; Equipped with The sensor (5') is adapted to achieve object detection using screen printing of conductive ink, in particular silver ink and / or copper ink. A ground pad module (GPM) (1) characterized by: [Item 2] Item 1. The ground pad module (GPM) (1) according to item 1, characterized by a cover sheet (7) which is particularly embodied as a glass fiber cover sheet and which is particularly rectangular in shape, and the foil (4') is attached to the cover sheet (7) by at least one of baking, pressing, and gluing. [Item 3] the GPM (1) comprises a further sensor arrangement (3") having a further foil (4") with a further plurality of sensors (5") and a further connecting cable (6"); the further plurality of sensors (5") and the further connection cable (6") are printed on the further foil (4"), in particular by screen printing of silver ink and / or copper ink, said further plurality of sensors (5") being configured to provide object detection; The further foil (4") is attached to the cover sheet (7), in particular by at least one of baking, pressing and gluing. Item 2. The ground pad module (GPM) (1) according to item 2. [Item 4] the foil (4') is provided with a connecting strip (8'), in particular an L-shaped connecting strip, or the further foil (4") is provided with a further connecting strip (8"), in particular an L-shaped connecting strip, respectively, the plurality of sensors (5') or respectively the further plurality of sensors (5") are electrically connected to separate components of the GPM via the connecting strip (8') or respectively the further connecting strip (8"), the connecting cable (6') or, respectively, the further connecting cable (6") is routed from the connecting strip (8') or, respectively, the further connecting strip (8") to the plurality of sensors (5') or, respectively, the further plurality of sensors (5"), The individual sensors of the plurality of sensors (5') or the further plurality of sensors (5") can be accessed via the connecting strip (8') or via the further connecting strip (8"), respectively. 4. The ground pad module (GPM) (1) according to item 2 or 3, characterized in that: [Item 5] the connecting strip (8') and the further connecting strip (8") are separated from the cover sheet (7), the foil (4') and the further foil (4") are arranged on the cover sheet (7) in such a way that the connecting strip (8') is arranged substantially on the further foil (4") and the further connecting strip (8") is arranged substantially on the foil (4'), The connecting strip (8') and the further connecting strip (8") are bent away from the further foil (4") or, respectively, from the foil (4'), in particular at substantially 90 degrees relative to the cover sheet (7). 5. The ground pad module (GPM) (1) according to item 4, characterized in that: [Item 6] The connecting strip (8') and the further connecting strip (8") are laterally displaced relative to each other 6. The ground pad module (GPM) (1) according to item 4 or 5, characterized in that: [Item 7] At least one of the connecting strip (8') and the further connecting strip (8") is inserted into a receiving slot of the separate component of the GPM (1), in particular into a receiving slot of a PCB comprising at least one of a processing unit and a control unit. 7. The ground pad module (GPM) (1) according to item 4, 5 or 6, characterized in that: [Item 8] At least one of the sensor arrangement (3') and the further sensor arrangement (3") is positioned between the cover sheet (7) and the power dissipation means (2). 8. The ground pad module (GPM) (1) according to any one of items 1 to 7, characterized in that: [Item 9] at least one of the sensor arrangement (3') and the further sensor arrangement (3") is positioned on an opposite side of the cover sheet (7) to the power dissipation means (2), The cover sheet (7) is provided with holes through which at least one of the connecting strips (8') and the further connecting strips (8") passes. 8. The ground pad module (GPM) (1) according to any one of items 1 to 7, characterized in that: [Item 10] the cover sheet (7) has a cover sheet spatial extent, the foil (4') and the further foil (4') have a foil spatial extent and a further foil spatial extent, respectively; the foil spatial extent relative to the cover sheet spatial extent; or the ratio of the foil spatial extent plus the further foil spatial extent to the cover sheet spatial extent is Less than 0.9, especially less than 0.5 The ground pad module (GPM) (1) according to any one of items 1 to 9, characterized in that: [Item 11] the power emitted by the power emission means (2) is emitted substantially through an emission area; the foil (4'), or The foil (4') + a further foil (4") is at least as large as the emission area and is positioned within the emission area. The ground pad module (GPM) (1) according to any one of items 1 to 10, characterized in that: [Item 12] At least one of the plurality of sensors (5') and the further plurality of sensors (5") is embodied as a loop sensor and is arranged in a two-dimensional array on the foil (4') or, respectively, on the further foil (4"). 12. The ground pad module (GPM) (1) according to any one of items 1 to 11, characterized in that: [Item 13] the sensor (5') and the connection cable (6'); Further sensors (5") and further connecting cables (6"), At least one of printed in layers on the foil (4') or, respectively, on a further foil (4"), with at least one insulating layer printed on the foil (4') or, respectively, at least one further insulating layer printed on the further foil (4"); 13. The ground pad module (GPM) (1) according to any one of items 1 to 12, characterized in that: [Item 14] The GPM (1) is provided with a drive over lamp (9), The cover sheet (7) is inserted into the recess (10) of the drive over lamp (9) on all sides, The cover sheet (7) is attached to the drive over lamp (9) by means of a tongue and groove attachment mechanism in particular, The cover sheet (7) is particularly non-flat and has a bent section near the drive over ramp (9). 14. The ground pad module (GPM) (1) according to any one of items 1 to 13, characterized in that: [Item 15] printing a plurality of sensors (5') and connecting cables (6') on said foil, in particular by screen printing of a conductive ink, in particular a silver ink and / or a copper ink; 15. A method for producing the GPM according to any one of items 1 to 14, comprising:

Claims

1. A ground pad module (GPM) (1) for wirelessly charging a battery in an electric vehicle, the GPM comprising: a power discharging means (2) configured to provide electrical power to a car pad module (GPM) included in the electric vehicle and configured to charge the battery, the GPM configured to inductively transfer electrical power from the GPM to the CPM; a sensor construction (3') configured to conduct at least one of a sensed current, a measured induced current, and a voltage; A ground pad module (GPM) (1) comprising: The sensor structure is a foil (4') as a base substrate; a plurality of sensors (5') and connecting cables (6') printed on the foil, the sensors (5') being configured to provide object detection; a cover sheet (7) to which said foil (4') is attached; and It is equipped with said foil (4') is provided with a connecting strip (8'), the plurality of sensors (5') are electrically connected to separate components of the GPM via the connecting strips (8'); The connection cables (6') are routed from the connection strips (8') to the plurality of sensors (5'); A ground pad module (GPM) (1) through which individual sensors of said plurality of sensors (5') can be accessed via said connection strips (8').

2. the GPM (1) comprises a further sensor arrangement (3") having a further foil (4") with a further plurality of sensors (5") and a further connecting cable (6"), said further sensors (5") and said further connecting cables (6") are printed on said further foil (4"), said further plurality of sensors (5") being configured to provide object detection; The further foil (4") is attached to the cover sheet (7). A ground pad module (GPM) (1) according to claim 1, characterized in that:

3. said further foil (4") is provided with a further connecting strip (8"), the further sensors (5") are electrically connected to separate components of the GPM via the further connecting strips (8"), the further connection cables (6") are routed from the further connection strip (8") to the further plurality of sensors (5"); The individual sensors of said further plurality of sensors (5") can be accessed via said further connecting strip (8"). A ground pad module (GPM) (1) according to claim 2, characterized in that:

4. the connecting strip (8') and the further connecting strip (8") are separated from the cover sheet (7), the foil (4') and the further foil (4") are arranged on the cover sheet (7) in such a way that the connecting strip (8') is arranged substantially on the further foil (4") and the further connecting strip (8") is arranged substantially on the foil (4'), The connecting strip (8') and the further connecting strip (8") are bent away from the further foil (4") or away from the foil (4'), respectively. A ground pad module (GPM) (1) according to claim 3, characterized in that:

5. The connecting strip (8') and the further connecting strip (8") are laterally displaced relative to one another A ground pad module (GPM) (1) according to claim 3, characterized in that:

6. At least one of the connecting strip (8') and the further connecting strip (8") is inserted into a receiving slot of the separate component of the GPM (1). A ground pad module (GPM) (1) according to claim 3, characterized in that:

7. At least one of the sensor arrangement (3') and the further sensor arrangement (3") is positioned between the cover sheet (7) and the power dissipation means (2). A ground pad module (GPM) (1) according to claim 1, characterized in that:

8. at least one of the sensor arrangement (3') and the further sensor arrangement (3") is positioned on an opposite side of the cover sheet (7) to the power dissipation means (2); The cover sheet (7) is provided with holes through which at least one of the connecting strips (8') and the further connecting strips (8'') passes. A ground pad module (GPM) (1) according to claim 1, characterized in that:

9. the cover sheet (7) has a cover sheet spatial extent, the foil (4') and the further foil (4') have a foil spatial extent and a further foil spatial extent, respectively; the foil spatial extent relative to the cover sheet spatial extent; or the ratio of the foil spatial extent plus the further foil spatial extent to the cover sheet spatial extent is Less than 0.9 A ground pad module (GPM) (1) according to claim 1, characterized in that:

10. the power emitted by the power emission means (2) is emitted substantially through an emission area; the foil (4'), or The foil (4') + further foil (4") is at least as large as the emission area and is positioned within the emission area. A ground pad module (GPM) (1) according to claim 1, characterized in that:

11. At least one of the plurality of sensors (5') and the further plurality of sensors (5") is embodied as a loop sensor and is arranged in a two-dimensional array on the foil (4') or, respectively, on the further foil (4"). A ground pad module (GPM) (1) according to claim 1, characterized in that:

12. the sensor (5') and the connecting cable (6'); a further sensor (5") and a further connecting cable (6"); At least one of printed in layers on the foil (4') or on the respective further foil (4"), with at least one insulating layer printed on the foil (4') or, respectively, at least one further insulating layer printed on the further foil (4"); A ground pad module (GPM) (1) according to claim 1, characterized in that:

13. The GPM (1) is provided with a drive over lamp (9), The cover sheet (7) is inserted into a recess (10) of the drive over lamp (9) on all sides, The cover sheet (7) has a bent section near the drive over ramp (9). A ground pad module (GPM) (1) according to claim 1, characterized in that:

14. printing a plurality of sensors (5') and connecting cables (6') on said foil; A method for producing the GPM of any one of claims 1 to 13, comprising:

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