High-power wireless charging coil structure

Abstract

The utility model discloses a high-power wireless charging coil structure, which can freely combine and assemble a ground transmitting end and a vehicle receiving end to a certain extent according to different practical applications, and can accelerate design and manufacture and reduce production cost without adding new design and structure production tasks on the premise of achieving better magnetic coupling. The structure is characterized in that the structure comprises M unit-size column strip modularized coil splicing discs, and M is a natural number greater than or equal to 1; n unit sizes of rib modular coils are spliced, wherein N is an integer greater than or equal to 0; and winding a coil.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging, in particular to a high-power wireless charging coil structure. Background Art

[0002] The ground transmitter (GA) and vehicle receiver (VA) are the fundamental components of a wireless charging system. The quality of the magnetic coupling between the GA and VA directly impacts the feasibility and stability of wireless charging, and determines charging efficiency. Therefore, to meet diverse market needs and application scenarios, different GA and VA sizes must be designed. However, compatibility between GA and VA sizes is poor, significantly increasing design and production costs. Utility Model Content

[0003] In response to the above problems, the utility model provides a high-power wireless charging coil structure, which can be freely combined and assembled with the ground transmitting end and the vehicle receiving end to a certain extent according to different actual applications. On the premise of achieving good magnetic coupling, no new design and structural production tasks are added, which can speed up design and production and reduce production costs.

[0004] A high-power wireless charging coil structure, characterized in that it includes:

[0005] A modular coil platter of M unit-sized columns, where M is a natural number ≥ 1;

[0006] N unit-sized rib modular coil platter, where N is an integer ≥ 0;

[0007] and winding coils;

[0008] Each of the column modular coil platter is a rectangle with a size of a*b, and each of the column modular coil platter comprises a first bottom plate and a plurality of evenly distributed upper convex pillars, wherein the upper surface of the first bottom plate is provided with an array of the plurality of upper convex pillars;

[0009] Each of the rib modular coil platter is a rectangle with a size of a*b, and each of the rib modular coil platter includes a second bottom plate and a plurality of upper convex ribs arranged in parallel. The rib modular coil platter includes a first rib modular coil platter and a second rib modular coil platter. The upper surface of the second bottom plate of the first rib modular coil platter is provided with a plurality of upper convex ribs arranged in parallel along its short sides, and the upper surface of the second bottom plate of the second rib modular coil platter is provided with a plurality of upper convex ribs arranged in parallel along its long sides. The spacing between adjacent upper convex ribs is equal to form an embedding groove, and the width of the embedding groove allows the coil to be reliably embedded and arranged.

[0010] M of the column modular coil platters and N of the rib modular coil platters are spliced ​​together to form a spliced ​​rectangle of a preset shape. There is no wound coil in the central area of ​​the spliced ​​rectangle, and the wound coil is enclosed around the outer surface of the spliced ​​rectangle from the inside to the outside or from the outside to the inside.

[0011] It is further characterized by:

[0012] The preset height of the upper boss is not less than the sum of the thicknesses of all layers of the winding coils of the maximum design number of layers in the height dimension; the preset height of the upper convex rib is not less than the sum of the thicknesses of all layers of the winding coils of the maximum design number of layers in the height dimension;

[0013] The height of the upper convex column is not less than the sum of the stacking thicknesses of all coils when the coils are wound in two layers, and the height of the upper convex rib is not less than the sum of the stacking thicknesses of all coils when the coils are wound in two layers;

[0014] The column bar modular coil platter is also configured with a corresponding first pad, and a hole is provided on the first pad corresponding to the position of each upper boss. When the preset number of coil layers is less than the preset height of the upper boss, and the difference is relatively large, the corresponding first pad is paved on the upper surface of the first bottom plate of the column bar modular coil platter, and each upper boss passes through the corresponding hole and convexly sets. The extra height of the upper boss is compensated by the first pad, so as to avoid changing the distance between the coil and the ferrite, which causes the electromagnetic performance of the coupling mechanism to change;

[0015] The rib modular coil platter is also configured with a corresponding second pad, and an empty slot is provided on the second pad corresponding to the position of each upper convex rib. When the preset number of coil layers is less than the preset height of the upper convex rib, and the difference is relatively large, the corresponding second pad is paved on the upper surface of the second bottom plate of the rib modular coil platter, and each upper convex rib passes through the corresponding empty slot and is convexly arranged. The excess height of the upper convex rib is compensated by the second pad, so as to avoid changing the distance between the coil and the ferrite, which causes the electromagnetic performance of the coupling mechanism to change;

[0016] When N=0, the assembled rectangles are all formed by combining modular coils of columns;

[0017] When N is not 0, the central area of ​​the spliced ​​rectangle and the four corners of the peripheral surface area are composed of the column modular coil platter, the straight line areas of the four sides of the peripheral surface area of ​​the spliced ​​rectangle are respectively composed of 2L first rib modular coil platter and 2K second rib modular coil platter, the wound coil is formed from the inside out or from the outside in around the peripheral surface area of ​​the spliced ​​rectangle, and the wound coil is guided by the upper protrusions on the column modular coil platter at the four corners of the spliced ​​rectangle and the four corners of the central area to form corresponding transition angles;

[0018] The two ends of the upper convex ribs on the second bottom plate of the rib modular coil platter in the length direction are retracted relative to the corresponding end sides of the second bottom plate, so as to facilitate reliable winding of the coil with a transition angle.

[0019] It is further characterized by:

[0020] Preferably, a=b, and in this case, the first bottom plate and the second bottom plate are both square; in this case, the modular coil platter of the ribs is a configuration, which saves material costs.

[0021] A coil winding method for a high-power wireless charging coil structure, characterized by:

[0022] The outer dimensions of the ground transmitter or vehicle receiver are set to a rectangle with length = m*a and width = n*b. A modular coil platter with a unit size of a*b is designed. Without re-opening the mold, m*n modular coil disks are used to combine the required outer dimensions of the ground transmitter or vehicle receiver. At the same time, a convex winding protrusion is preset on the upper surface of the modular coil platter, so that the winding coil can complete the winding operation along the winding protrusion according to the set trajectory.

[0023] It is further characterized by:

[0024] The winding protrusions on the modular coil platter are all upper protrusions, and in this case the modular coil platter is a column-bar modular coil platter;

[0025] When the winding protrusion on the modular wire reel platter is a combination of an upper protruding column and an upper protruding rib, the modular coil platter includes a column-bar modular coil platter and a rib-bar modular coil platter.

[0026] It is further characterized by:

[0027] This method is not limited to the winding of single-layer coils, but is also applicable to the winding of double-layer or even multi-layer coils. The preset height of the upper protrusion is not less than the sum of the thicknesses of all layers of the wound coils of the maximum design number of layers in the height dimension; the preset height of the upper protrusion rib is not less than the sum of the thicknesses of all layers of the wound coils of the maximum design number of layers in the height dimension; when the actual number of winding layers is less than the designed number of layers, the excess height can be compensated by using a first pad with holes or a second pad with empty slots to avoid changing the distance between the coil and the ferrite, which may cause changes in the electromagnetic performance of the coupling mechanism;

[0028] If there are different layers of wound coils on the same modular coil assembly plate, the pad can be cut and processed, so the first pad and the second pad are made of materials that are easy to reprocess.

[0029] The column bar modular coil platter is also configured with a corresponding first pad, and a hole is provided on the first pad corresponding to the position of each upper boss. When the preset number of coil layers is less than the preset height of the upper boss, and the difference is relatively large, the corresponding first pad is paved on the upper surface of the first bottom plate of the column bar modular coil platter, and each upper boss passes through the corresponding hole and convexly sets. The extra height of the upper boss is compensated by the first pad, so as to avoid changing the distance between the coil and the ferrite, which causes the electromagnetic performance of the coupling mechanism to change;

[0030] The rib modular coil platter is also provided with a corresponding second pad, on which an empty slot is provided corresponding to the position of each upper convex rib. When the preset number of coil layers is less than the preset height of the upper convex rib and the difference is relatively large, the corresponding second pad is paved on the upper surface of the second bottom plate of the rib modular coil platter, and each upper convex rib passes through the corresponding empty slot and convex setting. The extra height of the upper convex rib is compensated by the second pad to avoid changing the distance between the coil and the ferrite, which causes the electromagnetic performance of the coupling mechanism to change.

[0031] After adopting the structure of the present invention, the coil disks of the ground transmitting end and the vehicle receiving end of different sizes are standardized into the column modular coil platter and rib modular coil platter, which are the smallest units of standardized modules. This greatly reduces the burden of design and production and saves the cost of opening molds for the ground transmitting end and the vehicle receiving end each time. In the early stage of product design, the frequent proofing process can be omitted, and the coil disks can be combined as needed to wind different numbers of turns, thereby realizing economical and rapid initial research and development. In addition, the problem of design scheme changes caused by changes in customer needs can be avoided, so that the compatibility and adaptability of the product are greatly enhanced, and two schemes, namely pure column modular coil platter and the combination of column modular coil platter and rib modular coil platter, can be provided for selection and matching to meet the needs of mass production in the later stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional schematic diagram of the column modular coil platter corresponding to the present utility model;

[0033] Figure 2 It is a three-dimensional schematic diagram of the modular coil platter of ribs corresponding to the present invention;

[0034] Figure 3 This is the specific embodiment 1 corresponding to the present utility model;

[0035] Figure 4 This is the specific embodiment 2 corresponding to the present utility model;

[0036] Figure 5 A perspective view of a first pad suitable for the present invention;

[0037] Figure 6 A perspective view of a second pad suitable for the present invention;

[0038] Figure 7 This is a side view of the arrangement of a modular coil platter with single-layer coils and double-layer coils in a specific embodiment of the present invention;

[0039] Figure 8 This is a schematic diagram of the assembly explosion of the utility model applied to the ground launch terminal;

[0040] The names corresponding to the serial numbers in the figure are as follows:

[0041] Column modular coil platter 10, first base plate 11, upper protruding column 12, rib modular coil platter 20, second base plate 21, upper protruding rib 22, embedding groove 23, wound coil 30, spliced ​​rectangle 40, shell 50, ferrite 60, aluminum plate 70, first pad 80, hole 81, second pad 90, empty slot 91. DETAILED DESCRIPTION

[0042] A high-power wireless charging coil structure, see Figures 1-8 , which includes:

[0043] A modular coil platter 10 of M unit-sized columns, where M is a natural number ≥ 1;

[0044] N unit-sized rib modular coil platter 20, where N is an integer ≥ 0;

[0045] and a wound coil 30;

[0046] Each column modular coil platter 10 is a rectangle with a size of a*b. Each column modular coil platter 10 includes a first bottom plate 11 and a plurality of evenly distributed upper bosses 12. The upper surface of the first bottom plate 11 is arrayed with a plurality of upper bosses 12.

[0047] Each rib modular coil platter 20 is a rectangle with a size of a*b. Each rib modular coil platter 20 includes a second bottom plate 21 and a plurality of upper convex ribs 22 arranged in parallel. The rib modular coil platter 20 includes a first rib modular coil platter and a second rib modular coil platter. The upper surface of the second bottom plate 21 of the first rib modular coil platter is provided with a plurality of upper convex ribs 22 arranged in parallel along its short sides. The upper surface of the second bottom plate 21 of the second rib modular coil platter is provided with a plurality of upper convex ribs 22 arranged in parallel along its long sides. The spacing between adjacent upper convex ribs 22 is equal, forming an embedding groove 23. The width of the embedding groove 23 allows the coil to be reliably embedded.

[0048] The preset height of the upper boss 12 is not less than the sum of the thicknesses of all layers of the winding coils 30 of the maximum design number of layers in the height dimension; the preset height of the upper convex rib 22 is not less than the sum of the thicknesses of all layers of the winding coils 30 of the maximum design number of layers in the height dimension.

[0049] The column-bar modular coil platter 10 is also equipped with a corresponding first pad 80. A hole 81 is provided on the first pad 80 corresponding to the position of each upper boss 12. When the preset number of coil layers is less than the preset height of the upper boss 12, and the difference is relatively large, the corresponding first pad 80 is paved on the upper surface of the first bottom plate 11 of the column-bar modular coil platter 10, and each upper boss 12 is inserted through the corresponding hole 81 and raised upward. The extra height of the upper boss 12 is compensated by the first pad 80 to avoid changing the distance between the coil and the ferrite, which may cause the electromagnetic performance of the coupling mechanism to change.

[0050] The rib modular coil platter 20 is also configured with a corresponding second pad 90, and an empty slot 91 is provided on the second pad 90 corresponding to the position of each upper convex rib. When the preset number of coil layers is less than the preset height of the upper convex rib 22 and the difference is relatively large, the corresponding second pad 90 is laid on the upper surface of the second bottom plate 21 of the rib modular coil platter 20, and each upper convex rib 22 passes through the corresponding empty slot 91 and is convex. The extra height of the upper convex rib is compensated by the second pad 90 to avoid changing the distance between the coil and the ferrite, which causes the electromagnetic performance of the coupling mechanism to change.

[0051] In a specific embodiment, the preset height of the upper boss 12 is not less than the sum of the stacking thicknesses of all coils when the wound coil 30 is two layers, and the height of the upper convex rib 22 is not less than the sum of the stacking thicknesses of all coils when the wound coil 30 is two layers.

[0052] M column modular coil platters 10 and N rib modular coil platters 20 are assembled to form a pre-set shaped assembled rectangle 40. There is no wound coil 30 in the central area of ​​the assembled rectangle 40. The wound coil 30 is enclosed around the outer surface of the assembled rectangle 40 from the inside to the outside or from the outside to the inside.

[0053] In a specific embodiment, when the winding coil 30 is preset to be two layers, the height of the upper protrusion 12 is higher than the thickness of the two layers of the winding coil 30; the height of the upper protrusion rib 22 is higher than the thickness of the two layers of the winding coil 30, ensuring reliable protection for the winding coil 30;

[0054] In a specific embodiment, when the winding coil 30 is preset to include one or two layers, the first bottom plate 11 of the column modular coil assembly 10 having only one layer of winding coil is paved with a first pad 80 (see FIG. Figure 7), a second pad 90 is laid on the second bottom plate 21 of the modular coil platter 20 with only one layer of coil winding (see Figure 7 Similar paving can be used).

[0055] When N=0, the assembled rectangles are all formed by assembling the column-bar modular coil assemblies 10 .

[0056] When N is not 0, the central area of ​​the assembled rectangle 40 and the four corners of the peripheral surface area are composed of column modular coil platters 10, and the straight areas of the four sides of the peripheral surface area of ​​the assembled rectangle 40 are respectively composed of 2L first rib modular coil platters and 2K second rib modular coil platters. The wound coil 30 is enclosed from the inside out or from the outside in around the peripheral surface area of ​​the assembled rectangle 40. The wound coil 30 is guided by the upper protrusions 12 on the column modular coil platters 10 at the four corners of the assembled rectangle 40 and the four corners of the central area to form corresponding transition angles.

[0057] The ends of the upper convex ribs 22 on the second bottom plate 21 of the rib modular coil platter 20 in the length direction are retracted relative to the corresponding end sides of the second bottom plate 21, so as to facilitate reliable winding of the coil with a transition angle.

[0058] When a=b, the first bottom plate 11 and the second bottom plate 21 are both square; at this time, the rib modular coil platter 20 is a single configuration, saving material costs.

[0059] The size of the smallest modular column modular coil platter 10 and the rib modular coil platter 20 are both 100*100. The size requirement of the existing target product ground transmitter is 500*400. Then 20 column modular coil platter 10 can be used to assemble and form a specific embodiment 1 (see Figure 3 , the number of layers of the winding coil 30 in the figure is two), when the number of layers of the winding coil 30 is one layer or part of it is one layer, the first pad 80 or the second pad 90 can be laid at the position of the corresponding modular platter;

[0060] Alternatively, 10 column modular coil assemblies 10 and 10 rib modular coil assemblies 20 are assembled to form the second embodiment (see Figure 4 , the number of layers of the wound coil 30 in the figure is two), when the number of layers of the wound coil 30 is one layer or part of it is one layer, the first pad 80 or the second pad 90 can be laid at the position of the corresponding modular platter.

[0061] A coil winding method for a high-power wireless charging coil structure:

[0062] The outer dimensions of the ground transmitting terminal or the vehicle receiving terminal are set to a rectangle with length = m*a and width = n*b. A modular coil platter with a unit size of a*b is designed. Without re-opening the mold, m*n modular coil disks are used to combine the required outer dimensions of the ground transmitting terminal or the vehicle receiving terminal. At the same time, a convex winding protrusion is preset on the upper surface of the modular coil platter, so that the wound coil 30 can complete the winding operation along the winding protrusion according to the set trajectory.

[0063] The winding protrusions on the modular coil platter are all upper protrusions 12. In this case, the modular coil platter is a column-bar modular coil platter 10.

[0064] When the winding protrusion on the modular coil platter is a combination of an upper protruding column 12 and an upper protruding rib 22 , the modular coil platter includes a column modular coil platter 10 and a rib modular coil platter 20 .

[0065] A coil winding method for a high-power wireless charging coil structure is not limited to the winding of single-layer coils, but is also applicable to the winding of double-layer or even multi-layer coils. The preset height of the upper protrusion 12 is not less than the sum of the thicknesses of all layers of the wound coils 30 in the height dimension of the maximum design number of layers; the preset height of the upper protrusion rib 22 is not less than the sum of the thicknesses of all layers of the wound coils 30 in the height dimension of the maximum design number of layers; when the actual number of wound layers is less than the designed number of layers, the excess height can be compensated by using a first pad 80 with holes or a second pad 90 with empty slots to avoid changing the distance between the coil and the ferrite, which would cause changes in the electromagnetic performance of the coupling mechanism.

[0066] If different layers of wound coils exist on the same modular coil assembly, the pads can be cut and processed, so the first pad 80 and the second pad 90 are made of materials that are easy to reprocess.

[0067] The column-bar modular coil platter 10 is equipped with a corresponding first pad 80. A hole 80 is provided on the first pad 80 corresponding to the position of each upper boss 12. When the preset number of coil layers is less than the preset height of the upper boss 12, and the difference is relatively large, the corresponding first pad 80 is paved on the upper surface of the first bottom plate 11 of the column-bar modular coil platter 10, and each upper boss 12 is inserted through the corresponding hole 81 and raised upward. The extra height of the upper boss 12 is compensated by the first pad 80 to avoid changing the distance between the coil and the ferrite, which may cause the electromagnetic performance of the coupling mechanism to change.

[0068] The rib modular coil platter 20 is provided with a corresponding second pad 90, and an empty slot 91 is provided on the second pad 90 corresponding to the position of each upper convex rib 22. When the preset number of coil layers is less than the preset height of the upper convex rib 22 and the difference is relatively large, the corresponding second pad 90 is laid on the upper surface of the second bottom plate 21 of the rib modular coil platter 20, and each upper convex rib 22 passes through the corresponding empty slot 91 and is convex. The extra height of the upper convex rib 22 is compensated by the second pad 90 to avoid changing the distance between the coil and the ferrite, which causes the electromagnetic performance of the coupling mechanism to change.

[0069] When the entire method is applied to the production of the ground transmitter, the modular coil assemblies are fixed one by one on the corresponding position of the upper surface of the housing 50 in advance, and then the winding coil 30 is installed along the set track to complete the winding operation along the winding protrusion, and then the ferrite 60 and the aluminum plate 70 are stacked respectively (see Figure 8 ).

[0070] Its beneficial effects are as follows:

[0071] (1) The coil disks of different sizes of the ground transmitter and vehicle receiver are standardized into the smallest unit of the standardized module, the column modular coil platter and the rib modular coil platter, which greatly reduces the design and production burden and saves the mold opening cost of each ground transmitter and vehicle receiver;

[0072] (2) In the early stages of product design, frequent proofing processes can be eliminated, coils can be combined as needed, and different numbers of turns can be wound, achieving economical and rapid initial R&D;

[0073] (3) It can avoid the problem of design changes caused by changes in customer needs, greatly enhancing the compatibility and adaptability of the product, and provide two options of pure column modular coil platter and a combination of column modular coil platter and rib modular coil platter to meet the needs of later mass production.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0075] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature or implementation described herein. The specification can include implicit combinations of explicitly mentioned features and / or implicit combinations of implicitly mentioned features. Such combinations are also expressly included within the scope of the specification and an embodiment.

Claims

1. A high-power wireless charging coil structure, characterized in that: It includes: A modular coil platter of M unit-sized columns, where M is a natural number ≥ 1; N unit-sized rib modular coil platter, where N is an integer ≥ 0; and winding coils; Each of the column modular coil platter is a rectangle with a size of a*b, and each of the column modular coil platter comprises a first bottom plate and a plurality of evenly distributed upper convex pillars, wherein the upper surface of the first bottom plate is provided with an array of the plurality of upper convex pillars; Each of the rib modular coil platter is a rectangle with a size of a*b, and each of the rib modular coil platter includes a second bottom plate and a plurality of upper convex ribs arranged in parallel. The rib modular coil platter includes a first rib modular coil platter and a second rib modular coil platter. The upper surface of the second bottom plate of the first rib modular coil platter is provided with a plurality of upper convex ribs arranged in parallel along its short sides, and the upper surface of the second bottom plate of the second rib modular coil platter is provided with a plurality of upper convex ribs arranged in parallel along its long sides. The spacing between adjacent upper convex ribs is equal to form an embedding groove, and the width of the embedding groove allows the coil to be reliably embedded and arranged. M of the column modular coil platters and N of the rib modular coil platters are spliced ​​together to form a spliced ​​rectangle of a preset shape. There is no wound coil in the central area of ​​the spliced ​​rectangle, and the wound coil is enclosed around the outer surface of the spliced ​​rectangle from the inside to the outside or from the outside to the inside.

2. The high-power wireless charging coil structure according to claim 1, characterized in that: The preset height of the upper boss is not less than the sum of the thicknesses of all layers in the height dimension of all the winding coils of the maximum design number of layers; the preset height of the upper convex rib is not less than the sum of the thicknesses of all layers in the height dimension of the winding coils of the maximum design number of layers.

3. The high-power wireless charging coil structure according to claim 2, characterized in that: The height of the upper convex column is not less than the sum of the stacking thicknesses of all coils when the wound coil is two layers, and the height of the upper convex rib is not less than the sum of the stacking thicknesses of all coils when the wound coil is two layers.

4. A high-power wireless charging coil structure according to claim 2 or 3, characterized in that: The column bar modular coil platter is further configured with a corresponding first pad, and a hole is provided on the first pad corresponding to the position of each upper boss. When the preset number of coil layers is less than the preset height of the upper boss, and the difference is relatively large, the corresponding first pad is paved on the upper surface of the first bottom plate of the column bar modular coil platter, and each upper boss is inserted through the corresponding hole and convexly arranged, and the excess height of the upper boss is compensated by the first pad; The rib modular coil platter is also equipped with a corresponding second pad, and an empty slot is provided on the second pad corresponding to the position of each upper convex rib. When the preset number of coil layers is less than the preset height of the upper convex rib, and the difference is relatively large, the corresponding second pad is paved on the upper surface of the second bottom plate of the rib modular coil platter, and each upper convex rib passes through the corresponding empty slot and is convexly arranged. The excess height of the upper convex rib is compensated by the second pad.

5. The high-power wireless charging coil structure according to claim 1, characterized in that: When N=0, the assembled rectangles are all formed by assembling modular coil discs of columns.

6. The high-power wireless charging coil structure according to claim 1, characterized in that: When N is not 0, the central area of ​​the spliced ​​rectangle and the four corners of the outer surface area are composed of the column modular coil platter, and the straight line areas on the four sides of the outer surface area of ​​the spliced ​​rectangle are respectively composed of 2L first rib modular coil platter and 2K second rib modular coil platter. The wound coil is formed from the inside to the outside or from the outside to the inside around the outer surface area of ​​the spliced ​​rectangle. The wound coil is guided by the upper protrusions on the column modular coil platter at the four corners of the spliced ​​rectangle and the four corners of the central area to form corresponding transition angles.

7. The high-power wireless charging coil structure according to claim 6, characterized in that: Both ends of the upper convex ribs on the second bottom plate of the rib modular coil platter in the length direction are retracted relative to the corresponding end sides of the second bottom plate.

8. The high-power wireless charging coil structure according to claim 1, characterized in that: a=b, and in this case, both the first bottom plate and the second bottom plate are square.

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