Wireless charging device and autonomous mobile device

Abstract

The utility model provides a wireless charging device and an autonomous mobile device. The wireless charging device comprises a housing; the charging coil is arranged in the shell; and the at least one first ferrite magnet is arranged on the inner wall of the shell. When the at least one first ferrite magnet is arranged on the inner wall of the shell, a magnetic field can be shielded through the first ferrite magnet arranged on the inner wall, the magnetic field is prevented from radiating to the periphery, the influence on normal work of peripheral electronic elements is avoided, and when the shell is a metal shell, the influence of the metal shell on the inductance of the charging coil is reduced; and eddy current and signal interference are prevented. Meanwhile, by arranging the ferrite, the coupling coefficient can be increased, the magnetoelectric conversion efficiency can be improved, higher inductance can be achieved by using the charging coil with fewer turns, in this way, on the premise that the inductance value is guaranteed, the size of the coil can be reduced, the resistance of the coil can be reduced, and then efficiency reduction caused by heating is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless charging, and in particular to a wireless charging device and an autonomous mobile device. Background Art

[0002] A wireless charger is one that doesn't use a traditional charging power cable to connect to the device being charged. Instead, it uses wireless charging technology, requiring the wireless power transmission coil to be embedded in a metal casing (such as aluminum) to achieve good heat dissipation and meet collision protection requirements. The metal casing reduces the self-inductance of the cable reel, which in turn reduces the mutual inductance between the transmitting and receiving coils. To maintain the original inductance, the outer diameter of the cable reel must be increased or the number of turns must be increased. This increases the volume of the cable reel and the overall size of the wireless charging device, making it difficult to meet the requirements of applications requiring a compact structure.

[0003] Therefore, how to design a wireless charging device that increases the coupling coefficient of the coil and improves the inductance without increasing the volume of the coil has become an urgent problem to be solved. Utility Model Content

[0004] The utility model aims to at least solve the problem that the coupling coefficient of the coil cannot be increased and the inductance cannot be improved without increasing the volume of the coil.

[0005] To this end, a first aspect of the present invention provides a wireless charging device.

[0006] A second aspect of the present invention provides an autonomous mobile device.

[0007] In view of this, a first aspect of the present invention provides a wireless charging device, comprising: a housing; a charging coil disposed in the housing; and at least one first ferrite magnet disposed on an inner wall of the housing.

[0008] The present invention provides a wireless charging device comprising a housing, a charging coil, and at least one first ferrite magnet. The charging coil and the at least one first ferrite magnet are both disposed within the housing. When the at least one first ferrite magnet is disposed on the inner wall of the housing, the first ferrite magnet disposed on the inner wall can shield the magnetic field, preventing the magnetic field from radiating to the surrounding area and affecting the normal operation of surrounding electronic components. Furthermore, when the housing is metal, the effect of the metal shell on the inductance of the charging coil is reduced, preventing the generation of eddy currents and signal interference. Furthermore, the provision of ferrites can improve the coupling coefficient and magnetoelectric conversion efficiency, thereby enabling the use of a charging coil with fewer turns to achieve higher inductance. This, while ensuring the inductance, not only reduces the coil volume but also reduces the coil resistance (the more turns, the higher the resistance), thereby reducing the efficiency reduction caused by heat generation. It is understood that multiple ferrites can be provided. Multiple ferrites can shield the magnetic field from multiple directions. Compared to shielding the magnetic field from only one direction, this can further enhance the coupling performance of the charging coil and improve charging efficiency.

[0009] The wireless charging device provided by the present invention may also have the following additional technical features:

[0010] In some technical solutions, the housing may optionally include a metal housing and a non-metal housing, and may also be a housing made of other materials.

[0011] In some technical solutions, optionally, at least one first ferrite magnet is arranged on the inner wall of the shell along the circumference of the charging coil.

[0012] In this technical solution, at least one first ferrite magnet can be arranged on the inner wall of the shell along the circumference of the charging coil, so as to shield the magnetic field in the circumferential direction of the charging coil, thereby increasing the inductance of the charging coil.

[0013] In some technical solutions, optionally, there are multiple first ferrite magnets, and the multiple first ferrite magnets are in contact with each other in sequence along the circumference of the charging coil.

[0014] In this technical solution, there are multiple first ferrite magnets, and the multiple first ferrite magnets are arranged in contact with each other in sequence along the circumference of the charging coil. That is, the multiple first ferrite magnets are arranged closely along the circumference of the coil. This can completely shield the circumferential magnetic field, thereby improving the shielding effect, further preventing the magnetic field from radiating to the surroundings, and increasing the inductance of the charging coil.

[0015] In some technical solutions, optionally, the first ferrite magnet is surrounded by the charging coil.

[0016] In this technical solution, the first ferrite magnet is surrounded by the charging coil. That is, the charging coil is wound around the first ferrite magnet. This not only positions the charging coil through the first ferrite magnet, but also eliminates mutual interference between the magnetic fields around the charging coil, thereby reducing eddy current losses in the magnetic field and improving charging efficiency.

[0017] In some technical solutions, optionally, the shell includes a mounting shell and a cover plate, the mounting shell is provided with an opening, the cover plate is covered at the opening, and both ends of the first ferrite magnet in the axial direction of the charging coil are respectively in contact with the mounting shell and the cover plate.

[0018] In this technical solution, the housing can be composed of a mounting shell and a cover plate. The mounting shell is provided with an opening, and the cover plate can be placed over the opening, thereby sealing the charging coil and the first ferrite within the mounting shell. At the same time, by placing the first ferrite magnet in contact with the mounting shell and the cover plate at both ends in the axial direction of the charging coil, the placement of the first ferrite magnet can be maximized, thereby further reducing the eddy current loss of the magnetic field and improving the charging efficiency. It is understandable that the larger the first ferrite magnet placed in the middle of the charging coil, the better the effect of eliminating the mutual interference of the magnetic fields around the middle of the charging coil. Therefore, placing the first ferrite magnet in contact with the mounting shell and the cover plate at both ends in the axial direction of the charging coil can maximize the placement of the first ferrite magnet.

[0019] In some technical solutions, optionally, a plurality of first ferrite magnets may be arranged at intervals along the circumference of the charging coil. Such an interval arrangement can reduce the material usage requirement and thus reduce costs.

[0020] In some technical solutions, optionally, the first ferrite magnet is adhered or clamped to the inner wall of the shell.

[0021] In this technical solution, the first ferrite magnet can be adhered to the inner wall of the housing, or the first ferrite magnet can be clipped onto the inner wall of the housing. Both the adhering and clipping methods are relatively simple, easy to operate, and convenient for assembly. Of course, other methods can also be used to set the first ferrite magnet on the inner wall of the housing.

[0022] In some technical solutions, optionally, the shell includes a mounting shell and a cover plate, the mounting shell is provided with an opening, and the cover plate is covered at the opening. The wireless charging device also includes: a back plate, which is arranged in the mounting shell and is located on the side of the charging coil away from the cover plate.

[0023] In this technical solution, the housing can be composed of a mounting shell and a cover plate. The mounting shell is provided with an opening, and the cover plate can be installed in the opening, thereby sealing the charging coil and ferrite within the mounting shell. The wireless charging device also includes a backplate, which is disposed within the mounting shell and on the side of the charging coil away from the cover plate. In this way, the backplate can shield the magnetic field generated by the charging coil, so that the magnetic field generated by the charging coil is emitted only from the cover plate side, thereby preventing the magnetic field from radiating to the surrounding area.

[0024] In some technical solutions, optionally, the wireless charging device further includes: a second ferrite magnet disposed in the mounting shell, and the charging coil is wound around the second ferrite magnet.

[0025] In this technical solution, the wireless charging device also includes a second ferrite magnet. The second ferrite magnet is disposed within the mounting housing, specifically in the center of the charging coil. That is, the charging coil is wound around the second ferrite magnet. This not only allows the charging coil to be positioned, but also eliminates mutual interference between the magnetic fields around the center of the charging coil, thereby reducing eddy current losses in the magnetic field and improving charging efficiency.

[0026] In some technical solutions, optionally, two opposite ends of the second ferrite magnet in the axial direction of the charging coil are respectively in contact with the back plate and the cover plate.

[0027] In this technical solution, by respectively abutting the opposite ends of the second ferrite magnet in the axial direction of the charging coil against the back plate and the cover plate, the setting of the second ferrite magnet can be maximized, thereby further reducing the eddy current loss of the magnetic field and improving the charging efficiency.

[0028] In some technical solutions, optionally, the charging coil is provided on the back plate.

[0029] In this technical solution, the charging coil can be set on the back plate, which not only can shield the magnetic field through the back plate, but also can make the structure more compact, thereby reducing the overall volume.

[0030] In some technical solutions, optionally, the backplate includes a ferrite magnet backplate.

[0031] In this technical solution, the backplate includes a ferrite magnet backplate, thereby achieving a good shielding effect. It can be understood that ferrite has low saturation flux density, low magnetic permeability, low Curie temperature, low medium and high frequency losses, and low cost. Therefore, it can not only effectively isolate magnetic fields, but also reduce costs.

[0032] In some technical solutions, optionally, the charging coil is a single-layer charging coil or a multi-layer charging coil.

[0033] In some technical solutions, optionally, when the charging coil is a single-layer charging coil, the single-layer charging coil is formed by winding a wire on the same plane, and the plane is arranged opposite to the cover plate.

[0034] In this technical solution, when the charging coil is a single-layer charging coil, the charging coil is wound with wire on a single plane, with the plane facing the cover. Specifically, the plane of the charging coil can be arranged parallel to the cover to maximize the magnetic field emission area. This allows inductive charging to occur through the magnetic field emitted from the cover side and the receiving coil, thereby improving charging efficiency.

[0035] In some technical solutions, optionally, the first ferrite magnet is a soft ferrite magnet or a permanent ferrite magnet.

[0036] In this technical solution, the first ferrite magnet can be a soft ferrite magnet or a permanent ferrite magnet. For example, the soft ferrite magnet can be a soft ferrite magnetic strip, so that the soft ferrite magnetic strip can be set on the inner wall of the housing.

[0037] In some technical solutions, optionally, the soft ferrite magnet is a manganese-zinc ferrite magnet or a nickel-zinc ferrite magnet.

[0038] A second aspect of the present invention provides an autonomous mobile device, comprising: a wireless charging device as in any technical solution of the first aspect.

[0039] The autonomous mobile device provided by the present invention includes the wireless charging device of any one of the technical solutions of the first aspect. Since the autonomous mobile device includes the wireless charging device of any one of the technical solutions of the first aspect, the autonomous mobile device provided by the present application also has all the beneficial technical effects of the wireless charging device of any one of the technical solutions of the first aspect, which will not be elaborated here.

[0040] Additional aspects and advantages of the present invention will become apparent in the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0042] Figure 1 An exploded view of a wireless charging device according to an embodiment of the present invention is shown;

[0043] Figure 2 A schematic diagram of an autonomous mobile device with a wireless charging device according to an embodiment of the present invention is shown.

[0044] in, Figure 1 and Figure 2 The corresponding relationship between the reference numerals and component names is as follows:

[0045] 10 wireless charging device, 1 housing, 12 mounting shell, 14 lug, 2 charging coil, 3 first ferrite magnet, 4 back plate, 5 second ferrite magnet, 20 autonomous mobile device, 202 battery, 30 charging pile, 302 transmitting coil. DETAILED DESCRIPTION

[0046] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features therein can be combined with each other without conflict.

[0047] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0048] Refer to the following Figure 1 and Figure 2 The present invention describes a wireless charging device and an autonomous mobile device according to some embodiments of the present invention.

[0049] According to an embodiment of the first aspect of the present invention, Figure 1 As shown, the first aspect of the present invention provides a wireless charging device 10, comprising a housing 1, a charging coil 2, and at least one first ferrite magnet 3. The charging coil 2 is disposed in the housing 1. The at least one first ferrite magnet 3 is disposed on the inner wall of the housing 1.

[0050] The wireless charging device 10 provided by the present invention includes a housing 1, a charging coil 2, and at least one first ferrite magnet 3. The charging coil 2 and the at least one first ferrite magnet 3 are both disposed within the housing 1. When the at least one first ferrite magnet 3 is disposed on the inner wall of the housing 1, the first ferrite magnet 3 disposed on the inner wall shields the magnetic field, preventing the magnetic field from radiating to the surrounding area and affecting the normal operation of surrounding electronic components. Furthermore, when the housing 1 is metal, the effect of the metal shell on the inductance of the charging coil 2 is reduced, preventing the generation of eddy currents and signal interference. Furthermore, the ferrite magnets can improve the coupling coefficient and magnetoelectric conversion efficiency, thereby enabling the use of a charging coil 2 with fewer turns to achieve higher inductance. This reduces the coil's volume while maintaining the required inductance and also reduces its resistance (more turns means higher resistance), thereby minimizing the loss of efficiency caused by heat generation. It is understood that multiple ferrite magnets can be provided. Multiple ferrite magnets can shield the magnetic field from multiple directions, further enhancing the coupling performance of the charging coil 2 and improving charging efficiency compared to shielding the magnetic field from only one direction. That is, the present application can increase the self-inductance of the charging coil 2 and the coupling coefficient between the two coils without increasing the volume of the charging coil 2.

[0051] In some embodiments, the housing 1 may optionally include a metal housing and a non-metallic housing. The metal housing has good heat dissipation performance and good strength and hardness, which can prevent damage to the charging coil 2 and the like. Of course, the housing 1 may also be made of other materials.

[0052] Among them, when the shell 1 is a metal shell, the metal shell will reduce the self-inductance of the charging coil 2, and the mutual inductance between the transmitting coil and the receiving coil will also decrease accordingly. In order to maintain the original inductance, the outer diameter of the charging coil 2 must be increased or the number of winding turns must be increased, so the volume will increase. However, by adopting the solution of the present application, the inductance can be increased without increasing the outer diameter of the charging coil 2 and the number of winding turns, thereby improving the coupling coefficient.

[0053] In some embodiments, optionally, the metal shell is an aluminum shell.

[0054] In some embodiments, optionally, a lug 14 is provided on the outer wall of the housing 1. The lug 14 may also be provided with a threaded hole to facilitate assembly with the cover plate.

[0055] In some embodiments, optionally, at least one first ferrite magnet 3 is disposed on the inner wall of the housing 1 along the circumference of the charging coil 2 .

[0056] In this embodiment, at least one first ferrite magnet 3 can be arranged on the inner wall of the shell 1 along the circumference of the charging coil 2, so as to shield the magnetic field in the circumferential direction of the charging coil 2, thereby increasing the inductance of the charging coil 2.

[0057] In some embodiments, optionally, there are multiple first ferrite magnets 3 , and the multiple first ferrite magnets 3 are in contact with each other in sequence along the circumference of the charging coil 2 .

[0058] In this embodiment, there are multiple first ferrite magnets 3, and the multiple first ferrite magnets 3 are arranged in contact with each other in sequence along the circumference of the charging coil 2. That is, the multiple first ferrite magnets 3 are arranged closely along the circumference of the coil. This can completely shield the circumferential magnetic field, thereby improving the shielding effect, further preventing the magnetic field from radiating to the surroundings, and increasing the inductance of the charging coil 2.

[0059] In some embodiments, optionally, the first ferrite magnet 3 is surrounded by the charging coil 2 .

[0060] In this embodiment, the first ferrite magnet 3 is surrounded by the charging coil 2. That is, the charging coil 2 is wound around the first ferrite magnet 3. This not only allows the first ferrite magnet 3 to position the charging coil 2, but also eliminates mutual interference between the magnetic fields around the center of the charging coil 2, thereby reducing eddy current losses in the magnetic field and improving charging efficiency.

[0061] In some embodiments, optionally, the shell 1 includes a mounting shell 12 and a cover plate, the mounting shell 12 is provided with an opening, the cover plate is covered at the opening, and the first ferrite magnet 3 is respectively abutted against the mounting shell 12 and the cover plate at both ends in the axial direction of the charging coil 2.

[0062] In this embodiment, the housing 1 can be composed of a mounting shell 12 and a cover plate. The mounting shell 12 is provided with an opening, and the cover plate can be installed in the opening, thereby sealing the charging coil 2 and the first ferrite magnet within the mounting shell 12. At the same time, by placing the first ferrite magnet 3 at both ends of the charging coil 2 in the axial direction in contact with the mounting shell 12 and the cover plate, respectively, the arrangement of the first ferrite magnet 3 can be maximized, thereby further reducing the eddy current loss of the magnetic field and improving charging efficiency. It can be understood that the larger the first ferrite magnet 3 is placed in the middle of the charging coil 2, the better the effect of eliminating mutual interference between the magnetic fields around the middle of the charging coil 2. Therefore, placing the first ferrite magnet 3 at both ends of the charging coil 2 in the axial direction in contact with the mounting shell 12 and the cover plate, respectively, can maximize the arrangement of the first ferrite magnet.

[0063] In some embodiments, optionally, the plurality of first ferrite magnets 3 may also be spaced apart along the circumference of the charging coil 2. Such spaced apart arrangement can reduce the material usage requirement and thus reduce the cost.

[0064] In some embodiments, optionally, the first ferrite magnet 3 is adhered or clamped to the inner wall of the housing 1 .

[0065] In this embodiment, the first ferrite magnet 3 can be adhered to the inner wall of the housing 1 or snap-fitted to the inner wall of the housing 1. Both adhering and snap-fitting methods are relatively simple, easy to operate, and convenient for assembly. Of course, other methods can also be used to dispose the first ferrite magnet 3 on the inner wall of the housing 1.

[0066] In some embodiments, optionally, the shell 1 includes a mounting shell 12 and a cover plate, the mounting shell 12 is provided with an opening, and the cover plate is covered at the opening. The wireless charging device 10 also includes: a back plate 4, which is arranged in the mounting shell 12 and is located on the side of the charging coil 2 away from the cover plate.

[0067] In this embodiment, the housing 1 may be composed of a mounting shell 12 and a cover plate. The mounting shell 12 is provided with an opening, and the cover plate may be positioned over the opening, thereby sealing the charging coil 2 and the ferrite within the mounting shell 12. The wireless charging device 10 also includes a back plate 4, which is disposed within the mounting shell 12 and on the side of the charging coil 2 away from the cover plate. This shields the magnetic field generated by the charging coil 2 via the back plate 4, emitting the magnetic field only from the cover plate side, thereby preventing the magnetic field from radiating to the surrounding area.

[0068] In some embodiments, optionally, the wireless charging device 10 further includes: a second ferrite magnet 5 disposed in the mounting shell 12 , and the charging coil 2 is wound around the second ferrite magnet 5 .

[0069] In this embodiment, the wireless charging device 10 also includes a second ferrite magnet 5. The second ferrite magnet 5 is disposed within the mounting housing 12, specifically in the center of the charging coil 2. That is, the charging coil 2 is disposed around the second ferrite magnet 5. This not only allows the second ferrite magnet 5 to position the charging coil 2, but also eliminates the mutual interference of the magnetic fields around the center of the charging coil 2, thereby reducing eddy current losses in the magnetic field and improving charging efficiency. At the same time, by abutting the opposite ends of the second ferrite magnet 5 against the back plate 4 and the cover plate, respectively, the arrangement of the second ferrite magnet 5 can be maximized, thereby further reducing eddy current losses in the magnetic field and improving charging efficiency.

[0070] In some embodiments, optionally, opposite ends of the second ferrite magnet 5 in the axial direction of the charging coil 2 abut against the back plate 4 and the cover plate respectively.

[0071] In this embodiment, by abutting the opposite ends of the second ferrite magnet 5 in the axial direction of the charging coil 2 against the back plate 4 and the cover plate respectively, the arrangement of the second ferrite magnet 5 can be maximized, thereby further reducing the eddy current loss of the magnetic field and improving the charging efficiency.

[0072] In some embodiments, optionally, the charging coil 2 is disposed on the back plate 4 .

[0073] In this embodiment, the charging coil 2 can be arranged on the back plate 4, which not only can shield the magnetic field through the back plate 4, but also can make the structure more compact, thereby reducing the overall volume.

[0074] In some embodiments, the back plate 4 optionally comprises a ferrite magnet back plate.

[0075] In this embodiment, the back plate 4 comprises a ferrite magnet back plate, thereby achieving a good shielding effect. It is understood that ferrite has low saturation flux density, low magnetic permeability, low Curie temperature, low medium and high frequency losses, and low cost. Therefore, it can not only effectively isolate the magnetic field, but also reduce costs.

[0076] In some embodiments, optionally, the charging coil is a single-layer charging coil or a multi-layer charging coil.

[0077] In some embodiments, optionally, when the charging coil is a single-layer charging coil, the single-layer charging coil 2 is formed by winding a wire on the same plane, and the plane is arranged opposite to the cover plate.

[0078] In this embodiment, when the charging coil is a single-layer charging coil, the charging coil 2 is formed by winding a conductor on the same plane, which is arranged opposite the cover plate. Specifically, the plane of the charging coil 2 can be arranged parallel to the cover plate to maximize the magnetic field emission area. This allows inductive charging to be achieved through the magnetic field emitted from the cover plate and the receiving coil, thereby improving charging efficiency.

[0079] In some embodiments, optionally, the first ferrite magnet 3 is a soft ferrite magnet or a permanent ferrite magnet.

[0080] In this embodiment, the first ferrite magnet 3 can be a soft ferrite magnet or a permanent ferrite magnet. For example, the soft ferrite can be a soft ferrite magnetic strip, so that the soft ferrite magnetic strip can be set on the inner wall of the housing 1.

[0081] In some embodiments, optionally, a thin soft ferrite magnetic strip may be attached to the inner wall of the housing 1 .

[0082] In some embodiments, optionally, a soft ferrite magnet block may be provided in the middle of the charging coil 2 , with both ends of the soft ferrite magnet block abutting against the inner wall of the housing 1 .

[0083] In some embodiments, optionally, the soft ferrite magnet is a manganese-zinc ferrite magnet or a nickel-zinc ferrite magnet.

[0084] In some embodiments, the wireless charging device 10 can optionally be used as a transmitting end during wireless charging, or as a receiving end.

[0085] like Figure 2 As shown, the second aspect of the present invention provides an autonomous mobile device 20, comprising: the wireless charging device 10 as in any one of the embodiments of the first aspect.

[0086] The autonomous mobile device 20 provided by the present invention includes the wireless charging device 10 according to any one of the embodiments of the first aspect. Since the autonomous mobile device 20 includes the wireless charging device 10 according to any one of the embodiments of the first aspect, the autonomous mobile device 20 provided by the present application also has all the beneficial technical effects of the wireless charging device 10 according to any one of the embodiments of the first aspect, which will not be repeated here.

[0087] In some embodiments, the autonomous mobile device 20 optionally further includes a battery 202, which can be charged via the wireless charging device 10. When charging is required, the autonomous mobile device 20 is moved near a charging station 30, and the wireless charging device 10 is aligned with the transmitting coil 302 of the charging station 30 to start charging.

[0088] In this utility model, the term "plurality" refers to two or more, unless otherwise specified. Terms such as "installed," "connected," "connected," and "fixed" should be interpreted broadly. For example, "connected" can refer to a fixed connection, a detachable connection, or an integral connection; "connected" can refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0089] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0090] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A wireless charging device, characterized in that: include: case; a charging coil, disposed in the housing; at least one first ferrite magnet disposed on an inner wall of the housing; The housing includes a mounting shell and a cover plate, the mounting shell is provided with an opening, the cover plate is provided to cover the opening, and both ends of the first ferrite magnet in the axial direction of the charging coil are respectively in contact with the mounting shell and the cover plate; At least one of the first ferrite magnets is arranged on the inner wall of the housing along the circumference of the charging coil; There are a plurality of first ferrite magnets, and the plurality of first ferrite magnets are in contact with each other in sequence along the circumference of the charging coil; The wireless charging device further includes: a back plate, disposed in the mounting shell and located on a side of the charging coil away from the cover plate; a second ferrite magnet disposed in the mounting shell, the charging coil being wound around the second ferrite magnet; Two opposite ends of the second ferrite magnet in the axial direction of the charging coil are respectively in contact with the back plate and the cover plate; A lug is provided on the outer wall of the shell, and a threaded hole is provided on the lug.

2. The wireless charging device according to claim 1, wherein: The first ferrite magnet is surrounded by the charging coil.

3. The wireless charging device according to claim 1 or 2, characterized in that: The first ferrite magnet is adhered or clamped to the inner wall of the shell.

4. The wireless charging device according to claim 1 or 2, characterized in that: The charging coil is arranged on the back plate; and / or The backplate includes a ferrite magnet backplate.

5. The wireless charging device according to claim 1 or 2, characterized in that: The first ferrite magnet is a soft ferrite magnet or a permanent ferrite magnet; and / or; The soft ferrite magnet is a manganese-zinc ferrite magnet or a nickel-zinc ferrite magnet.

6. An autonomous mobile device, characterized in that: include: The wireless charging device according to any one of claims 1 to 5.

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