Wireless charging device for electric vehicle

Abstract

The wireless charging device includes a first cover, a second cover, a foreign object detector, and a coil carrier. The foreign object detector is disposed between the first cover and the second cover and has a through hole. The coil carrier is disposed between the first cover and the second cover and includes a protrusion that passes through the through hole and abuts against the first cover.

Description

[Technical Field]

[0001] This invention relates to a wireless charging device. [Previous Technology]

[0002] Driven by environmental concerns, consumer demand for electric vehicles is increasing. Consequently, the electric vehicle market is also seeing a growing demand for wireless charging. When an electric vehicle is positioned above a wireless charging device, the device can charge it. However, if the electric vehicle accidentally presses against the wireless charging device, it can easily damage it. Therefore, developing a wireless charging device that can address these issues is one of the goals of companies in this technical field. [Summary of the Invention]

[0003] The present invention relates to a wireless charging device that can improve the aforementioned conventional problems.

[0004] This disclosure provides an embodiment of a wireless charging device. The wireless charging device includes a first cover, a second cover, a foreign object detector, and a coil carrier. The foreign object detector is disposed between the first cover and the second cover and has a through hole. The coil carrier is disposed between the first cover and the second cover and includes a protrusion, wherein the protrusion passes through the through hole and abuts against the first cover.

[0005] Another embodiment of this disclosure provides a wireless charging device. The wireless charging device includes a first cover, a second cover, a foreign object detector, a coil carrier, and an energy sensing disk. The foreign object detector is disposed between the first cover and the second cover. The coil carrier is disposed between the first cover and the second cover. The energy sensing disk is disposed between the first cover and the second cover. The first cover abuts against the coil carrier, the coil carrier abuts against the energy sensing disk, and the energy sensing disk abuts against the second cover.

[0006] In order to better understand the above and other aspects of the present invention, specific embodiments are described below in conjunction with the accompanying drawings:

Implementation Method

[0008] Please refer to Figures 1A to 5C. Figure 1A shows a schematic diagram of a wireless charging device 100 according to an embodiment of the present invention. Figure 1B shows a top view of the wireless charging device 100 in Figure 1A (the first cover 110 is not shown). Figure 2 shows a schematic diagram of the wireless charging device 100 in Figure 1A disposed on a carrier 10. Figures 3 and 4 show exploded views of the wireless charging device 100 in Figure 1A from different perspectives (the energy sensor 165 is not shown). Figure 5A shows a cross-sectional view of the wireless charging device 100 in Figure 1A along direction 5A-5A'. Figure 5B shows a cross-sectional view of the wireless charging device 100 in Figure 1A along direction 5B-5B'. Figure 5C shows a cross-sectional view of the wireless charging device 100 in Figure 1A along direction 5C-5C'.

[0009] As shown in Figures 1A and 2, the wireless charging device 100 can be disposed on the carrier 10 and used to charge electronic devices located on the wireless charging device 100. The carrier 10 is, for example, a ground, floor, or any other carrier capable of supporting the wireless charging device 100. The electronic device is, for example, an electric vehicle including at least one wheel, such as an electric motorcycle, electric car, electric bicycle, etc.

[0010] As shown in Figures 1A to 4, the wireless charging device 100 includes at least one first fixing member 105A, at least one second fixing member 105B, at least one third fixing member 105C, a first cover (or top cover) 110, a second cover (or bottom shell) 120, at least one foreign object detection (FOD) member 130, a coil carrier 140, a charging coil 150, an energy sensing plate 160, at least one energy sensing member 165, an insulating member 170, a sealing member 175, an abutment plate 180, a first circuit board 185A, and a second circuit board 185B.

[0011] As shown in Figures 1A-4, the foreign object detection element 130 is disposed between the first cover 110 and the second cover 120 and has at least one through hole 130a. The coil carrier 140 is disposed between the first cover 110 and the second cover 120 and includes at least one protrusion 141, wherein the protrusion 141 passes through the through hole 130a and abuts against the first cover 110. Thus, the applied force F1 (e.g., vehicle weight) applied to the first cover 110 can be transmitted to the carrier 10 through the coil carrier 140.

[0012] As shown in Figures 3, 4, and 5A, the first cover 110 and the coil carrier 140 can directly or indirectly abut against each other. In this embodiment, the first cover 110 and the coil carrier 140 are described as directly abutting against each other. "Directly abutting" in this context means that the two components are directly connected without any other components between them, while "indirectly abutting" means that the two components are connected through other components. The first cover 110 has a lower surface 110b, and the protrusion 141 has an end face 141e, wherein the end face 141e of the protrusion 141 abuts against the lower surface 110b of the first cover 110 to transmit the applied force F1. In one embodiment, the protrusion 141 and the first cover 110 are in surface contact, which can reduce the pressure of the applied force F1 acting on the surface. In one embodiment, the end face 141e of the protrusion 141 and the lower surface 110b of the first cover 110 are, for example, planes. The first cover 110 includes at least one abutment post 111, each abutment post 111 having a fixing hole 111a. The second cover 120 includes at least one abutment post 121, each abutment post 121 having a through hole 121a. A first fixing member 105A passes through the through hole 121a of the abutment post 121 and is fixed to the fixing hole 111a of the abutment post 111 of the first cover 110 to fix the relative position of the first cover 110 and the second cover 120. In one embodiment, the fixing hole 111a is, for example, a screw hole, and the first fixing member 105A is, for example, a threaded member.

[0013] As shown in Figures 3, 4, and 5A, the second cover 120 includes a cover body 122 and an abutment portion 123. The cover body 122 has a lower surface 122b, and the abutment portion 123 is connected to the lower surface 122b and protrudes relative to the lower surface 122b. The abutment plate 180 and the second cover 120 can directly or indirectly abut against each other. In this embodiment, the abutment plate 180 and the second cover 120 are described as directly abutting against each other. The abutment portion 123 has an end face 123e, and the end face 123e of the abutment portion 123 can abut against the upper surface 180u of the abutment plate 180.

[0014] As shown in Figures 1B, 3, 4, and 5A, the foreign object detection element 130 is disposed between the first cover 110 and the coil carrier 140. The foreign object detection element 130 includes a carrier plate 131 and at least one foreign object detection coil (FOD coil) 132. The carrier plate 131 has an upper surface 131u, and the foreign object detection coil 132 is disposed on the upper surface 131u of the carrier plate 131. The foreign object detection coil 132 is used to detect whether there is a foreign object above the wireless charging device 100. The carrier plate 131 has the aforementioned through hole 130a, and the foreign object detection coil 132 surrounds the through hole 130a and does not overlap with the through hole 130a (as shown in Figure 1B), which can prevent the protrusion 141 from interfering with the foreign object detection coil 132 after passing through the through hole 130a. In this embodiment, the number of foreign object detection elements 130 is multiple, for example, five, but the embodiments of the present invention are not limited to this.

[0015] As shown in Figures 3, 4, and 5A, the coil carrier 140 is disposed between the foreign object detector 130 and the second cover 120. The coil carrier 140 includes a coil carrier plate 142 and an abutment portion 143. The coil carrier plate 142 has a lower surface 142b. The abutment portion 143 is disposed on the lower surface 142b and protrudes relative to the lower surface 142b. The abutment portion 143 surrounds at least one groove 140r1. The charging coil 150 may be disposed within the groove 140r1. In this embodiment, the charging coil 150 is entirely located within the groove 140r1, thus preventing the charging coil 150 from protruding relative to the end face 143e of the abutment portion 143, thereby preventing the charging coil 150 from interfering with components below the charging coil 150 (e.g., the insulator 170). Since the charging coil 150 is entirely located within the groove 160r, the applied force F1 is not transmitted to the charging coil 150, thus avoiding damage to the charging coil 150. In addition, end face 143e may directly or indirectly abut against the upper surface 170u of the insulating member 170.

[0016] As shown in Figures 3, 4, and 5A, the coil carrier 140 further includes at least one first abutment portion 144 and at least one second abutment portion 145. The coil carrier plate 142 has an upper surface 142u. The first abutment portion 144 may be disposed on the upper surface 142u and protrude relative to the upper surface 142u. For example, the first abutment portion 144 may be connected to the edge of the upper surface 142u. The second abutment portion 145 connects to the first abutment portion 144. The first abutment portion 144 and the at least one second abutment portion 145 separate at least one groove 140r2. The aforementioned protrusion 141 is located within the groove 140r2. Furthermore, the number of grooves 140r2 is equal to the number of foreign object detectors 130. Each foreign object detector 130 may be disposed within a corresponding groove 140r2. In this embodiment, the foreign object detection element 130 can be entirely located within the groove 140r2, so that the applied force F1 is not transmitted to the foreign object detection element 130, thus avoiding damage to the foreign object detection element 130.

[0017] As shown in Figure 5A, the first abutting portion 144 has an end face 144e, which can directly or indirectly abut against the lower surface 110b of the first cover 110. In this embodiment, the end face 144e and the lower surface 110b are directly abutted against each other as an example. As shown in Figures 3 and 5C, the second abutting portion 145 has an end face 145e, which can directly or indirectly abut against the lower surface 110b of the first cover 110. In this embodiment, the end face 145e and the lower surface 110b are directly abutted against each other as an example.

[0018] As shown in Figures 3, 4, and 5A, the energy sensing disk 160 is disposed between the first cover 110 and the second cover 120. The energy sensing disk 160 and the coil carrier disk 140 can engage with each other. Furthermore, the energy sensing disk 160 and the coil carrier disk 140 can directly or indirectly abut against each other. In this embodiment, the energy sensing disk 160 and the coil carrier disk 140 are described as indirectly abutting against each other. For example, the energy sensing disk 160 abuts against the coil carrier disk 140 through the insulating member 170 to transmit the applied force F1. In another embodiment, the insulating member 170 may be omitted from the wireless charging device 100. In this case, the energy sensing disk 160 and the coil carrier disk 140 can directly abut against each other to transmit the applied force F1. In this embodiment, the energy sensing disk 160 is an object containing magnetically conductive material, such as a magnetically conductive sheet disk.

[0019] As shown in Figures 3, 4, and 5A, the energy sensing plate 160 includes an energy sensing carrier plate 161, at least one third abutment portion 162, and at least one fourth abutment portion 163. The energy sensing carrier plate 161 has an upper surface 161u. The third abutment portion 162 is disposed on the upper surface 161u and protrudes relative to the upper surface 161u. For example, the third abutment portion 162 may be connected to the edge of the upper surface 161u. The fourth abutment portion 163 is disposed on the upper surface 161u and protrudes relative to the upper surface 161u. The fourth abutment portion 163 connects to the third abutment portion 162. The third abutment portion 162 and the at least one fourth abutment portion 163 are separated to form at least one groove 160r. Each energy sensing element 165 may be disposed within a corresponding groove 160r. In this embodiment, the energy sensing element 165 may be entirely disposed within the corresponding groove 160r. Thus, the applied force F1 is not transmitted to the energy sensor 165, avoiding damage to the energy sensor 165. In this embodiment, the energy sensor 165 is an object containing magnetically conductive material, such as a magnetic sheet.

[0020] As shown in Figures 3, 4, and 5A, the third abutment portion 162 has an end face 162e. The end face 162e of the third abutment portion 162 can directly or indirectly abut against the lower surface 170b of the insulating member 170 to transmit the applied force F1. Furthermore, the third abutment portion 162 and the insulating member 170 are in surface contact, which can reduce the pressure of the applied force F1 acting on the surface. In this embodiment, the end face 162e of the third abutment portion 162 directly abuts against the lower surface 170b of the insulating member 170. The fourth abutment portion 163 has an end face 163e. The end face 163e of the fourth abutment portion 163 can directly or indirectly abut against the lower surface 170b of the insulating member 170 to transmit the applied force F1. Furthermore, the fourth abutment portion 163 and the insulating member 170 are in surface contact, which can reduce the pressure of the applied force F1 acting on the surface. In this embodiment, the end face 163e of the fourth abutment portion 163 directly abuts the lower surface 170b of the insulating member 170. In another embodiment, the insulating member 170 may be omitted from the wireless charging device 100. In this way, the end face 163e of the fourth abutment portion 163 of the energy sensing disk 160 can directly abut against the end face 143e of the abutment portion 143 of the coil carrier disk 140 to transmit the applied force F1.

[0021] As shown in Figures 3, 4, and 5A, the energy sensing disk 160 and the second cover 120 can directly or indirectly abut against each other. In this embodiment, the direct abutment between the energy sensing disk 160 and the second cover 120 is described as an example. The energy sensing disk 160 has a lower surface 160b, and the aforementioned second cover 120 has an upper surface 120u. The upper surface 120u of the second cover 120 can directly or indirectly abut against the lower surface 160b of the energy sensing disk 160 to transmit the applied force F1. Furthermore, the second cover 120 and the energy sensing disk 160 have surface contact, which can reduce the pressure of the applied force F1 acting on the surface. In this embodiment, the direct abutment between the upper surface 120u of the second cover 120 and the lower surface 160b of the energy sensing disk 160 is described as an example. In one embodiment, the lower surface 160b and the upper surface 120u cooperate. For example, both the lower surface 160b and the upper surface 120u are planes, but they can also be cooperating curved surfaces.

[0022] As shown in Figures 5A-5B, the energy sensing element 165 is, for example, a magnetic core. The magnetic core is, for example, made of ferrite. Ferrite is a ceramic material whose main component is iron oxide. Ferrite is, for example, magnetic and can be used to make permanent magnets, transformer cores, and other related applications.

[0023] As shown in Figures 3, 4, and 5A, the insulating member 170 is disposed between the first cover 110 (or charging coil 150) and the second cover 120 (or energy sensing disk 160). The insulating member 170 has an upper surface 170u and a lower surface 170b. In this embodiment, the abutting portion 143 of the aforementioned coil carrier disk 140 abuts against the upper surface 170u of the insulating member 170. The aforementioned energy sensing disk 160 abuts against the lower surface 170b of the insulating member 170. The insulating member 170 is made of, for example, rubber or plastic. In one embodiment, the insulating member 170 is, for example, Mylar.

[0024] As shown in Figures 3, 4, and 5A, a seal can be disposed between the first cover 110 and the second cover 120 to seal the space between the first cover 110 and the second cover 120, preventing external impurities from entering the space between the first cover 110 and the second cover 120. The second cover 120 has a groove 120r, and the seal 175 can be disposed within the groove 120r of the second cover 120. The first cover 110 includes a pressing portion 112. When the first cover 110 and the second cover 120 are engaged, the pressing portion 112 presses against the seal 175. The seal 175 is, for example, rubber.

[0025] As shown in Figures 3, 4, and 5A, the abutment plate 180 may be disposed on the second cover 120. For example, the abutment plate 180 may be disposed on the abutment portion 123 of the second cover 120. The abutment plate 180 may be made of metal, such as aluminum or its alloy. The abutment plate 180 has at least one first through hole 180a1 and at least one second through hole 180a2. The aforementioned first fixing member 105A may pass through the first through hole 180a1 and the through hole 121a of the abutment post 121 of the second cover 120, and be fixed to the fixing hole 111a of the first cover 110 to fix the relative position between the first cover 110, the second cover 120, and the abutment plate 180. The second fixing member 105B may pass through the second through hole 180a2 of the abutment plate 180 and be fixed to the carrier 10 to fix the relative position between the abutment plate 180 and the carrier 10. In this embodiment, the second fixing member 105B is, for example, an expansion screw. The third fixing member 105C can pass through the through hole 140a of the coil carrier 140 and be fixed to the fixing hole 120a of the second cover 120 to fix the relative position between the coil carrier 140 and the second cover 120. In one embodiment, the third fixing member 105C is, for example, a threaded member, and the fixing hole 120a of the second cover 120 is, for example, a screw hole.

[0026] As shown in Figures 3 and 4, the first circuit board 185A and the second circuit board 185B can be configured or fixed to the second cover 120. The aforementioned charging coil 150 and foreign object detection coil 132 can be electrically connected to the first circuit board 185A and / or the second circuit board 185B to be controlled by the first circuit board 185A and / or the second circuit board 185B. It should be noted that, in this embodiment, foreign object detection is based on a foreign object made of metal. Therefore, the foreign object detection element 130 is a metal foreign object detection element, and the foreign object detection coil 132 is a metal foreign object detection coil.

[0027] Please refer to Table 1 below, which lists the dynamic simulation force results of each second fixing member 105B when the electric vehicle rolls over the wireless charging device 100 in the X direction, and Table 2 lists the dynamic simulation force results of each second fixing member 105B when the electric vehicle rolls over the wireless charging device 100 in the Y direction. The electric vehicle rolls over the wireless charging device 100 with the parameters in Table 3 (simulated by single-wheel rolling). The numbering of the second fixing member 105B is shown in Figure 1B. The dimensions of the second fixing member 105B are simulated in M8 (metric) and the strength grade is 4.8. Its theoretical maximum axial force is 10.5 kN (kilonewtons), and its theoretical maximum shear force is 5.86 kN.

[0028] Table 1 (Dynamic simulation force results along the X direction) Screw size: M8; Strength rating: 4.8 Theoretically, the maximum axial force Ft can be borne ,Rd 10.5 kN; Theoretically maximum shear force Fv ,Rd 5.86 kN The serial number of the second fastener 105B 105B1 105B2 105B3 105B4 Maximum axial force Ft ,Ed (N) 219 202 201 302 Maximum shear force Fv ,Ed (N) 1150 958 906 1080 Overall safety factor: 0.211 0.177 0.168 0.205 The serial number of the second fastener 105B 105B5 105B6 105B7 105B8 Maximum axial force Ft ,Ed (N) 342 407 386 369 Maximum shear force Fv ,Ed (N) 1390 1380 1460 1250 Overall safety factor: 0.260 0.263 0.275 0.238

[0029] Table 2 (Dynamic simulation force results along the Y direction) Screw size: M8; Strength rating: 4.8 Theoretically, the maximum axial force Ft can be borne ,Rd 10.5 kN; Theoretically maximum shear force Fv ,Rd 5.86 kN The serial number of the second fastener 105B 105B1 105B2 105B3 105B4 Maximum axial force Ft ,Ed (N) 253 173 230 352 Maximum shear force Fv ,Ed (N) 1060 1520 1450 1030 Overall safety factor: 0.198 0.271 0.263 0.200 The serial number of the second fastener 105B 105B5 105B6 105B7 105B8 Maximum axial force Ft ,Ed (N) 262 146 221 428 Maximum shear force Fv ,Ed (N) 1050 1530 1400 1030 Overall safety factor: 0.197 0.271 0.254 0.205

[0030] Table 3 Single wheel weight (N) 4893 Tire specifications P225 / 75R 15 Tire pressure (kPa) 218 ±13 Rolling speed (km / h) 8 ±2

[0031] Please refer to Figures 6A and 6B. Figure 6A shows the relationship between the safety factor in Table 1 and the multiple second fasteners 105B, while Figure 6B shows the relationship between the safety factor in Table 2 and the multiple second fasteners 105B. The horizontal axis in the figures represents the safety factor of the second fastener 105B under axial force, and the vertical axis represents the safety factor of the second fastener 105B under shear force. As shown in Figure 6A, the safety factors of all second fasteners 105B1~105B8 under axial force and the safety factors of all second fasteners 105B1~105B8 (represented by hollow circles in the figure) under shear force are all less than 1 (the farther away from 1, the safer the second fastener 105B). As shown in Figure 6B, the safety factors of all second fasteners 105B1~105B8 under axial force and the safety factors of all second fasteners 105B1~105B8 (represented by solid circles in the figure) under shear force are also less than 1. This confirms that the force applied by the electric vehicle is effectively and distributed to at least one element of the wireless charging device 100, avoiding excessive concentration of the force applied by the electric vehicle on a single element (e.g., the second fixing member 105B).

[0032] Based on the static simulation results, regardless of where the single wheel weight (force) is statically applied (along the Z direction) to the first cover 110 of the wireless charging device 100 in Figure 1, the maximum stress borne by the wireless charging device 100 is less than the maximum withstand stress of the first cover 110. Assuming the first cover 110 is made of polypropylene (PC), its maximum withstand stress is approximately 62 MPa. Table 3 shows that the maximum stress at any location where the single wheel weight is statically applied (along the Z direction) to the first cover 110 of the wireless charging device 100 in Figure 1 does not exceed 20 MPa. This confirms that the static force applied by the electric vehicle can be effectively and dispersedly transmitted to at least one element of the wireless charging device 100, avoiding excessive concentration of force on a single element (e.g., the second fixing member 105B).

[0033] In summary, the present invention provides a wireless charging device. The wireless charging device includes a first cover, a second cover, a coil carrier, and an energy sensing disk. When a force is applied to the first cover, the force can be transmitted to the second cover through the first cover and the coil carrier, and / or through the first cover, the coil carrier, and the energy sensing disk. The wireless charging device further includes an element (e.g., a coil, a foreign object detector, and / or an energy sensor), which can be disposed between the first cover, the second cover, the coil carrier, and the energy sensing disk but is not subjected to force (not abutted or clamped) on the first cover, the second cover, the coil carrier, and / or the energy sensing disk. When a force is applied to the first cover, the force is not transmitted to this element. Furthermore, the aforementioned two abutting elements can abut in a line-abutting or surface-abutting manner. Compared to point abutting, line abutting or surface abutting can reduce the pressure of the force applied on the line or surface, thereby reducing the stress on the force-bearing element.

[0034] In summary, although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the invention, and such modifications and refinements are not limited to the embodiments of the present invention, but are still within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the appended claims. [Simplified Explanation of the Diagram]

[0007] Figure 1A shows a schematic diagram of a wireless charging device 100 according to an embodiment of the present invention. Figure 1B shows a top view of the wireless charging device 100 of Figure 1A (the first cover 110 is not shown). Figure 2 shows a schematic diagram of the wireless charging device 100 of Figure 1A disposed on a carrier 10. Figures 3 and 4 show exploded views of the wireless charging device 100 of Figure 1A from different perspectives (the energy sensor 165 is not shown). Figure 5A shows a cross-sectional view of the wireless charging device 100 of Figure 1A along direction 5A-5A'. Figure 5B shows a cross-sectional view of the wireless charging device 100 of Figure 1A along direction 5B-5B'. Figure 5C shows a cross-sectional view of the wireless charging device 100 of Figure 1A along direction 5C-5C'. Figure 6A shows a diagram showing the relationship between the safety factor in Table 1 and the plurality of second fixing members 105B. Figure 6B shows the relationship between the safety factor in Table 2 and the multiple second fasteners 105B.

Claims

1. A wireless charging device for an electric vehicle, comprising: The first cover; The second cover; A foreign object detection device is disposed between the first cover and the second cover and has a through hole; And a coil carrier, disposed between the first cover and the second cover, and including a protrusion, wherein the protrusion passes through the through hole and abuts against the first cover.

2. The wireless charging device for an electric vehicle as claimed in claim 1, wherein the first cover has a lower surface and the protrusion abuts against the lower surface of the first cover.

3. The wireless charging device for an electric vehicle as described in claim 2, wherein the lower surface of the first cover is a plane.

4. The wireless charging device for an electric vehicle as described in claim 1 further includes: An energy sensing disk is placed against the coil carrier disk.

5. The wireless charging device for an electric vehicle as described in claim 4, wherein the energy sensing disk comprises: An energy-sensing carrier plate having an upper surface; The device also includes an abutment portion disposed on the upper surface and protruding relative to the upper surface, the abutment portion forming a groove, wherein the abutment portion abuts against the coil carrier; wherein the wireless charging device for the electric vehicle further includes: an energy sensor disposed in the groove.

6. The wireless charging device for an electric vehicle as described in claim 5 further includes: An insulating element; wherein the abutting portion of the energy sensing disk abuts against the insulating element.

7. The wireless charging device for an electric vehicle as described in claim 1, wherein the coil carrier includes: A coil carrier plate has the following surface; The device also includes an abutment portion disposed on the lower surface of the coil carrier plate and protruding relative to the lower surface, the abutment portion forming a groove; wherein the wireless charging device for the electric vehicle further includes: a charging coil disposed in the groove.

8. The wireless charging device for an electric vehicle as described in claim 7 further includes: An insulating element; wherein the abutting portion of the coil carrier abuts against the insulating element.

9. The wireless charging device for an electric vehicle as claimed in claim 4, wherein the second cover has an upper surface, the energy sensing disk has a lower surface, and the upper surface of the second cover abuts against the lower surface of the energy sensing disk.

10. The wireless charging device for an electric vehicle as described in claim 1, further comprising: A connecting plate abuts against the second cover.

11. The wireless charging device for an electric vehicle as described in claim 1, wherein the foreign object detection element comprises: A circuit board; And a foreign object detection coil, disposed on the circuit board and surrounding the through hole.

12. A wireless charging device for an electric vehicle, comprising: The first cover; The second cover; A foreign object detection device is disposed between the first cover and the second cover; A coil carrier is disposed between the first cover and the second cover; and an energy sensing disk is disposed between the first cover and the second cover; wherein the first cover abuts against the coil carrier, the coil carrier abuts against the energy sensing disk, and the energy sensing disk abuts against the second cover.

13. The wireless charging device for an electric vehicle as claimed in claim 12, wherein the coil carrier is disposed between the first cover and the energy sensing disk.

14. The wireless charging device for an electric vehicle as described in claim 12, wherein the energy sensing disk is disposed between the coil carrier and the second cover.

15. The wireless charging device for an electric vehicle as claimed in claim 12, wherein the first cover has a lower surface and a protrusion of the coil carrier abuts against the lower surface of the first cover.

16. The wireless charging device for an electric vehicle as described in claim 15, wherein the lower surface of the first cover is a plane.

17. The wireless charging device for an electric vehicle as described in claim 12, wherein the energy sensing disk comprises: An energy-sensing carrier plate having an upper surface; An abutting portion is disposed on the upper surface and protrudes relative to the upper surface, the abutting portion surrounds a groove, wherein the abutting portion abuts against the coil carrier; wherein the wireless charging device of the electric vehicle further includes: an energy sensor disposed in the groove.

18. The wireless charging device for an electric vehicle as described in claim 17 further includes: An insulating element; wherein the abutting portion of the energy sensing disk abuts against the insulating element.

19. The wireless charging device for an electric vehicle as described in claim 12, wherein the coil carrier comprises: A coil carrier plate has the following surface; The device also includes an abutment portion disposed on the lower surface and protruding relative to the lower surface, the abutment portion surrounding a groove; wherein the wireless charging device of the electric vehicle further includes: a charging coil disposed in the groove.

20. The wireless charging device for an electric vehicle as described in claim 12, wherein the foreign object detection element comprises: A circuit board; And a foreign object detection coil, disposed on the circuit board and surrounding one of the through holes of the foreign object detection element.

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