Coil module and electronic equipment

Abstract

The embodiment of the invention is applicable to the field of wireless charging, and relates to a coil module and electronic equipment, the coil module comprises a magnetic isolation sheet and an induction coil, the magnetic isolation sheet comprises a first nanocrystalline layer, the first nanocrystalline layer comprises a first area in a non-closed annular shape, the first area is made of nanocrystalline which is not subjected to magnetic fragmentation treatment, and the induction coil is arranged in the first area. A projection of the induction coil overlaps a projection of a first region in the first nanocrystalline layer. Through the coil module provided by the embodiment of the invention, the wireless charging efficiency can be improved under the condition of avoiding nanocrystalline heating in the wireless charging process.

Description

[0001] This application is based on a divisional application with application number 202211110319.0, application date September 13, 2022, and invention name “Magnetic isolation sheet, coil module and electronic device”. The entire contents of the original application are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of wireless charging, and more specifically, to a coil module and an electronic device. Background Art

[0003] In the field of wireless charging, the induction coil used for charging usually needs to cooperate with a magnetic isolation sheet to realize the function of wireless charging. Among them, the magnetic isolation sheet is usually made of nanocrystalline material.

[0004] Nanocrystalline material is a material with high saturation magnetic induction, high magnetic permeability, low coercivity and low high-frequency loss. It has excellent comprehensive magnetic properties and is widely used in the field of wireless charging. Traditional nanocrystals are prone to heating during wireless charging. In order to avoid heating of nanocrystals during wireless charging, nanocrystals are usually crushed; however, the saturation magnetic induction (B) of nanocrystals after crushing is lower than that of nanocrystals. S ) value and magnetic permeability are low, resulting in low charging efficiency of wireless charging devices that use nanocrystals after crushing as magnetic isolation sheets.

[0005] Based on this, how to improve the charging efficiency of wireless charging equipment has become an urgent problem to be solved. Summary of the invention

[0006] The present application provides a magnetic isolation sheet, a coil module and an electronic device, which can improve the charging efficiency of a wireless charging device.

[0007] In a first aspect, a magnetic isolation sheet is provided. The magnetic isolation sheet is applied to a coil module in a wireless charging device. The magnetic isolation sheet includes a first nanocrystalline layer. The first nanocrystalline layer includes a first region in the shape of a non-closed ring. The material of the first region is nanocrystals that have not been subjected to magnetic fragmentation treatment.

[0008] It should be understood that the ring may refer to a circular ring or other ring shapes, and the embodiments of the present application are not limited to this.

[0009] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer, and the first nanocrystalline layer includes a first region in the shape of a non-closed ring, wherein the material of the first region is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the shape of the first region is a non-closed ring, that is, there is a gap in the first region that runs through the first region, the gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by magnetic flux changes, that is, avoiding the heating of the nanocrystalline material during the wireless charging process. At the same time, when the first nanocrystalline layer is used to avoid the heating of the nanocrystals during the wireless charging process, the first region in the first nanocrystalline layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystalline layer S The value and magnetic permeability will not be reduced, that is, the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0010] In a possible implementation, the first nanocrystal layer further includes a second region, and the second region is arranged around the first region, wherein the material of the second region is nanocrystals that have undergone magnetic fragmentation treatment.

[0011] It should be understood that the second area is arranged around the first area, which may mean that the second area is arranged on the inside and / or outside of the first area, the second area may be only on the inside of the first area, the second area may be only on the outside of the first area, or the second area may be on both the inside and the outside of the first area, and the embodiments of the present application are not limited to this.

[0012] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, including at least one layer of nanocrystals, the at least one layer of nanocrystals including a first nanocrystal layer, the first nanocrystal layer including a first area and a second area, wherein the first area is in the shape of a non-closed annular area, and the second area is around the first area. The material of the first area is nanocrystals that have not been treated with magnetic fragmentation, and the material of the second area is nanocrystals that have been treated with magnetic fragmentation. This is equivalent to adding nanocrystals that have been treated with magnetic fragmentation to the edge area of ​​the first area, and the eddy current loss caused by the magnetic flux change in the edge area of ​​the first area is reduced by the nanocrystals that have been treated with magnetic fragmentation on the edge area of ​​the first area, thereby further avoiding the heating of the magnetic isolation sheet caused by eddy current loss.

[0013] In a possible implementation manner, the first area and the second area are adjacent to each other.

[0014] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and includes at least one layer of nanocrystals, wherein the at least one layer of nanocrystals includes a first nanocrystal layer, and the first nanocrystal layer includes a first area and a second area, wherein the first area is a non-closed annular area, and the second area is on the inner side and / or the outer side of the first area, and the first area and the second area are adjacent to each other, wherein the first area in the first nanocrystal layer is nanocrystals that have not been treated with magnetic fragmentation, and the second area is nanocrystals that have been treated with magnetic fragmentation. Since the first area and the second area are adjacent to each other, the nanocrystals that have been treated with magnetic fragmentation are added to the edge area of ​​the first area, and the eddy current loss caused by the change of magnetic flux is reduced by the nanocrystals that have been treated with magnetic fragmentation on the edge area of ​​the first area, thereby further avoiding the heating of the magnetic isolation sheet caused by eddy current loss.

[0015] In a possible implementation manner, the first region includes at least one first notch, wherein the first notch runs through the inner diameter and the outer diameter of the ring shape of the first region.

[0016] It should be understood that when the size of the electronic device to which the magnetic isolation sheet is applied is relatively large, for example, the magnetic isolation sheet is applied to a mobile phone. Since the battery power of the mobile phone is usually relatively large, the size of the magnetic isolation sheet used is also relatively large. The larger the size of the magnetic isolation sheet, the greater the eddy current loss on it.

[0017] The magnetic isolation sheet provided in the embodiment of the present application can be applied to the coil module in the wireless charging device, which includes at least one layer of nanocrystals, the at least one layer of nanocrystals includes a first nanocrystal layer, the first nanocrystal layer includes a first area and a second area, wherein the first area is a non-closed annular area, the second area is around the first area, the first area is connected to the second area, the first area in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the second area is nanocrystals that have been subjected to magnetic fragmentation treatment, and when the size of the magnetic isolation sheet is greater than a preset threshold, the first area includes at least one first notch, wherein the first notch passes through the inner diameter and outer diameter of the annular area of ​​the first area. Since the first area is a non-closed annular area, the first area includes at least one first gap, which is equivalent to the existence of two or more gaps in an annular area. The above two or more gaps are respectively the gap that makes the annular area non-closed, and the at least one first gap existing in the first area. In this way, the magnetic field between the wireless charging transmitting end device and the wireless charging receiving end device that is perpendicular to the plane where the power receiving coil is located can be released through the gap on the first area to reduce the eddy current loss on the magnetic isolation sheet, thereby avoiding the eddy current loss caused by the large size of the magnetic isolation sheet, and further avoiding the heating of the magnetic isolation sheet caused by the large eddy current loss.

[0018] In a possible implementation, the first nanocrystal layer further includes a third region disposed concentrically with the first region, wherein the third region is in the shape of a non-closed ring, and the material of the third region is nanocrystals that have not been subjected to magnetic fragmentation treatment.

[0019] It should be understood that the first area and the third area are two areas arranged concentrically, wherein the first area can be inside the third area or outside the third area, which is not limited in the embodiment of the present application.

[0020] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer, and the first nanocrystalline layer includes a first area in the shape of a non-closed ring, and a third area concentrically arranged with the first area, and the shape of the third area is also a non-closed ring. Among them, the material of the first area and the third area is nanocrystals that have not been treated with magnetic fragmentation. Since the shapes of the first area and the third area are non-closed rings, that is, there is a gap that runs through the first area in the first area and the third area. The gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by magnetic flux changes, that is, avoiding the heating of the nanocrystalline material during wireless charging. At the same time, when the first nanocrystalline layer is used to avoid the heating of the nanocrystals during the wireless charging process, the first area in the first nanocrystalline layer is nanocrystals that have not been treated with magnetic fragmentation, so that the saturation magnetic induction intensity B of the first nanocrystalline layer S The value and magnetic permeability will not be reduced, so the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0021] In one possible implementation, the first nanocrystal layer also includes a fourth region concentrically arranged with the first region, wherein the fourth region is in the shape of a closed ring, the outer diameter of the fourth region is smaller than the inner diameter of the first region, and the material of the fourth region is nanocrystal that has not been subjected to magnetic crushing treatment.

[0022] It should be understood that, since the outer diameter of the fourth region is smaller than the inner diameter of the first region, this is equivalent to the first region being outside the fourth region.

[0023] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer, and the first nanocrystalline layer includes a first area in the shape of a non-closed ring, and a fourth area arranged concentrically with the first area, the shape of the fourth area is a closed ring, and the outer diameter of the fourth area is smaller than the inner diameter of the first area, which is equivalent to the first area being outside the fourth area, and the materials of the first area and the fourth area are nanocrystalline that have not been subjected to magnetic fragmentation treatment. Since the shape of the first area is a non-closed ring, and the first area is outside the fourth area, it is equivalent to the existence of a gap on the outside of the first nanocrystalline layer, through which the magnetic flux change when the magnetic lines of force in the magnetic field pass through the nanocrystal can be avoided, thereby avoiding eddy current loss caused by magnetic flux change, that is, avoiding the heating of the nanocrystalline material during the wireless charging process. At the same time, when the first nanocrystalline layer is used to avoid the heating of the nanocrystal during the wireless charging process, the first area and the fourth area in the first nanocrystalline layer are nanocrystals that have not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystalline layer S The value and magnetic permeability will not be reduced, that is, the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided by the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0024] In a possible implementation, the magnetic isolation sheet further includes a second nanocrystalline layer, and the material of the second nanocrystalline layer is nanocrystals that have undergone magnetic fragmentation treatment.

[0025] The magnetic isolation sheet provided in the embodiment of the present application includes a first nanocrystalline layer and a second nanocrystalline layer, wherein the first nanocrystalline layer includes a first area, the first area is a non-closed annular area, the first area on the first nanocrystalline layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the second nanocrystalline layer is nanocrystals that have been subjected to magnetic fragmentation treatment. Since the first area on the first nanocrystalline layer is a non-closed annular area, the manufacturing process of the first nanocrystalline layer is relatively complicated, and the manufacturing process of the second nanocrystalline layer is relatively simple. The embodiment of the present application can reduce the manufacturing difficulty of the magnetic isolation sheet by adopting the second nanocrystalline layer with a relatively simple manufacturing process as one of the nanocrystalline layers in at least one layer of nanocrystals.

[0026] In a possible implementation manner, a projection of the first nanocrystal layer overlaps a projection of the second nanocrystal layer.

[0027] In a possible implementation manner, the second nanocrystal layer further includes a second notch, and a projection of the second notch overlaps with a projection of the first region in the first nanocrystal layer.

[0028] In the second aspect, a magnetic isolation sheet is provided. The magnetic isolation sheet is applied to a coil module in a wireless charging device. The magnetic isolation sheet includes a first nanocrystalline layer. The first nanocrystalline layer includes a first region. The first region includes at least two concentric annular regions. The at least two concentric rings include a first ring and a second ring. The inner diameter of the first ring is greater than the outer diameter of the second ring. The first region in the first nanocrystalline layer is nanocrystals that have not been subjected to magnetic fragmentation treatment.

[0029] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes at least one layer of nanocrystals, and the at least one layer of nanocrystals includes a first nanocrystal layer, and the first nanocrystal layer includes a first region, wherein the first region is at least two concentric annular regions, and the at least two concentric annular regions include a first annular region and a second annular region, and the inner diameter of the first annular region is greater than the outer diameter of the second annular region, that is, there is a gap between the first annular region and the second annular region in the first region, and the gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by the change of magnetic flux, that is, avoiding the heating of the nanocrystal material during the wireless charging process. At the same time, when the first nanocrystal layer is used to avoid the heating of the nanocrystals during the wireless charging process, the first region in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystal layer S The value and magnetic permeability will not be reduced, so the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0030] In a possible implementation, the first nanocrystal layer further includes a second region, the second region is arranged around the first region, and the second region in the first nanocrystal layer is nanocrystal that has undergone magnetic fragmentation treatment.

[0031] In a possible implementation manner, the first area and the second area are adjacent to each other.

[0032] In a possible implementation, the first nanocrystal layer further includes a third region disposed concentrically with the first region, wherein the third region is in the shape of a non-closed ring, and the material of the third region is nanocrystals that have not been subjected to magnetic fragmentation treatment.

[0033] In one possible implementation, the first nanocrystal layer also includes a fourth region concentrically arranged with the first region, wherein the fourth region is in the shape of a closed ring, the outer diameter of the fourth region is smaller than the inner diameter of the first region, and the material of the fourth region is nanocrystal that has not been subjected to magnetic crushing treatment.

[0034] In a possible implementation, the at least two nanocrystal layers further include a second nanocrystal layer, and the material of the second nanocrystal layer is nanocrystals that have undergone magnetic fragmentation treatment.

[0035] In a possible implementation manner, the projection of the first nanocrystal layer overlaps with the projection of the second nanocrystal layer.

[0036] In a possible implementation manner, the second nanocrystal layer further includes a second notch, and a projection of the second notch overlaps with a projection of the first region in the first nanocrystal layer.

[0037] In a third aspect, a coil module is provided. The coil module is applied to an electronic device used for wireless charging. The coil module includes a magnetic isolation sheet and an induction coil as described in any one of the first aspect or the second aspect.

[0038] The coil module provided in the embodiment of the present application includes a magnetic isolation sheet, wherein the magnetic isolation sheet includes at least one layer of nanocrystals, the at least one layer of nanocrystals includes a first nanocrystal layer, the first nanocrystal layer includes a first region, wherein the first region is a non-closed annular region, that is, there is a gap in the first region that runs through the first region, and the gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by the change of magnetic flux, that is, avoiding the heating of the nanocrystal material during wireless charging. At the same time, when the first nanocrystal layer is used to avoid the heating of the nanocrystals during wireless charging, the first region in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystal layer S The value and magnetic permeability will not be reduced, so the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0039] In a possible implementation manner, the induction coil is disposed on one side of the magnetic isolation sheet, and the distance between the first nanocrystalline layer and the induction coil is smaller than the distance between the second nanocrystalline layer and the induction coil.

[0040] In a possible implementation, the induction coil is disposed on one side of the magnetic isolation sheet, and the distance between the first nanocrystalline layer and the induction coil is greater than the distance between the second nanocrystalline layer and the induction coil.

[0041] The coil module provided in the embodiment of the present application includes a magnetic isolation sheet and an induction coil, wherein the magnetic isolation sheet includes a first nanocrystalline layer and a second nanocrystalline layer, wherein the second nanocrystalline layer is nanocrystalline that has been subjected to magnetic fragmentation treatment, and the distance between the second nanocrystalline layer and the induction coil in the coil module is smaller than the distance between the first nanocrystalline layer and the induction coil, so that the magnetic flux changes generated when the induction coil is working can be absorbed by the second nanocrystalline layer that is closer to the induction coil, further avoiding eddy current losses on the magnetic isolation sheet, and further avoiding the heat generated by eddy current losses on the magnetic isolation sheet when the first nanocrystalline layer is used to improve the wireless charging efficiency.

[0042] In one possible implementation, the induction coil is arranged on one side of the magnetic isolation plate, the magnetic isolation plate includes a first nanocrystalline layer and a second nanocrystalline layer, the second nanocrystalline layer includes a second gap, the projection of the second gap overlaps with the projection of the first area, the distance between the second nanocrystalline layer and the induction coil is smaller than the distance between the first nanocrystalline layer and the induction coil, and the material of the second nanocrystalline layer is nanocrystals that have been subjected to magnetic fragmentation treatment.

[0043] The coil module provided in the embodiment of the present application includes a magnetic isolation sheet and an induction coil, wherein the magnetic isolation sheet includes a first nanocrystalline layer and a second nanocrystalline layer, wherein the second nanocrystalline layer includes a second notch, the projection of the second notch overlaps with the projection of the first region, the material of the second nanocrystalline layer is nanocrystalline that has been subjected to magnetic fragmentation treatment, and the distance between the second nanocrystalline layer and the induction coil in the coil module is less than the distance between the first nanocrystalline layer and the induction coil. This is equivalent to the induction coil being able to occupy the space where the second notch is located on the second nanocrystalline layer, so that when the thickness of the induction coil remains unchanged, the induction coil occupies the space where the second notch is located, thereby reducing the thickness of the magnetic isolation sheet, and then reducing the thickness of the coil module obtained by combining the magnetic isolation sheet and the induction coil, thereby saving space in the wireless charging device.

[0044] In a possible implementation manner, the projection of the induction coil overlaps with the projection of the first area on the magnetic isolation sheet.

[0045] The coil module provided in the embodiment of the present application includes an induction coil and a magnetic isolation sheet, wherein the magnetic isolation sheet includes at least one layer of nanocrystals, the at least one layer of nanocrystals includes a first nanocrystal layer, the first nanocrystal layer includes a first region, wherein the first region is a non-closed annular region, the first region in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the projection of the first region overlaps with the projection of the induction coil, so that the magnetic field generated when the induction coil is working can be absorbed by the nanocrystals on the first nanocrystal layer that have not been subjected to magnetic fragmentation treatment, thereby avoiding eddy current losses caused by changes in magnetic flux in the magnetic field, and further avoiding heating of the magnetic isolation sheet due to eddy current losses, thereby improving the efficiency of the wireless charging device.

[0046] In a possible implementation manner, the size of the induction coil is the same as the size of the first area on the magnetic isolation sheet.

[0047] The coil module provided in the embodiment of the present application includes an induction coil and a magnetic isolation sheet, wherein the magnetic isolation sheet includes at least one layer of nanocrystals, the at least one layer of nanocrystals includes a first nanocrystal layer, the first nanocrystal layer includes a first area, wherein the first area is a non-closed annular area, and the first area in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the projection of the first area overlaps with the projection of the induction coil, and the size of the induction coil is the same as the size of the first area on the magnetic isolation sheet, the magnetic field generated when the induction coil is working can be accurately absorbed by the nanocrystals on the first nanocrystal layer that have not been subjected to magnetic fragmentation treatment, thereby avoiding the arrangement of larger-sized nanocrystals that have not been subjected to magnetic fragmentation treatment under the induction coil to absorb the magnetic field generated when the induction coil is working, thereby avoiding the magnetic isolation sheet being too large in size. At the same time, the coil module provided in the embodiment of the present application can also effectively improve the charging efficiency of the wireless charging device through the nanocrystals in the first area that have not been subjected to magnetic fragmentation treatment. That is to say, while avoiding the heating of the magnetic isolation sheet caused by eddy current loss and improving the efficiency of the wireless charging device, the coil module provided in the embodiment of the present application can effectively save the space occupied by the coil module on the electronic device.

[0048] In a possible case, the first nanocrystalline layer in the magnetic isolation sheet further includes a second region, the second region is arranged around the first region, and the second region in the first nanocrystalline layer is nanocrystalline that has been subjected to magnetic fragmentation treatment.

[0049] In a possible implementation manner, the first area and the second area in the magnetic isolation sheet are adjacent to each other.

[0050] In a possible implementation, the magnetic isolation sheet further includes a second nanocrystalline layer, and the material of the second nanocrystalline layer is nanocrystals that have undergone magnetic fragmentation treatment.

[0051] In a possible implementation manner, a projection of the first nanocrystalline layer and a projection of the second nanocrystalline layer in the magnetic isolation sheet overlap.

[0052] In a possible implementation, the induction coil is disposed on one side of the magnetic isolation sheet, and the distance between the first nanocrystalline layer in the magnetic isolation sheet and the induction coil is smaller than the distance between the second nanocrystalline layer and the induction coil.

[0053] In a possible implementation, the induction coil is disposed on one side of the magnetic isolation sheet, and the distance between the first nanocrystalline layer in the magnetic isolation sheet and the induction coil is greater than the distance between the second nanocrystalline layer and the induction coil.

[0054] In one possible implementation, the induction coil is arranged on one side of the magnetic isolation sheet, the second nanocrystalline layer includes a second gap, the projection of the second gap overlaps with the projection of the first area, the second nanocrystalline layer is nanocrystalline that has been subjected to magnetic fragmentation treatment, and the distance between the second nanocrystalline layer and the induction coil is smaller than the distance between the first nanocrystalline layer and the induction coil.

[0055] In a fourth aspect, an electronic device is provided, and the electronic device includes the coil module as shown in the third aspect.

[0056] In a possible implementation, the electronic device is a wireless charging transmitter device.

[0057] Exemplarily, the electronic device is a charging pad.

[0058] In a possible implementation manner, the electronic device is a wireless charging receiving end device.

[0059] Exemplarily, the electronic device is a smart watch.

[0060] Exemplarily, the electronic device is a mobile phone.

[0061] The magnetic isolation sheet, coil module and electronic device provided in the embodiments of the present application, wherein the magnetic isolation sheet is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer, and the first nanocrystalline layer includes a first region in the shape of a non-closed ring, wherein the material of the first region is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the shape of the first region is a non-closed ring, that is, there is a gap in the first region that runs through the first region, the gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by magnetic flux changes, that is, avoiding the heating of the nanocrystalline material during the wireless charging process. At the same time, when the first nanocrystalline layer is used to avoid the heating of the nanocrystals during the wireless charging process, the first region in the first nanocrystalline layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystalline layer S The value and magnetic permeability will not be reduced, so the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 It is a schematic diagram of a power transmission coil and a power receiving coil in a wireless charging device;

[0063] Figure 2 is a schematic diagram of a nanocrystal that has been subjected to magnetic crushing;

[0064] Figure 3It is a schematic diagram of the shape of small fragments in a nanocrystal treated with magnetic crushing;

[0065] Figure 4 is a schematic diagram of an application scenario provided in an embodiment of the present application;

[0066] Figure 5 It is a structural schematic diagram of a magnetic isolation sheet provided in an embodiment of the present application;

[0067] Figure 6 This is a schematic diagram of the shape of a first area on a magnetic isolation sheet provided in an embodiment of the present application;

[0068] Figure 7 is a schematic diagram of a nanocrystalline layer on a magnetic isolation sheet provided in an embodiment of the present application;

[0069] Figure 8 is a schematic diagram of the magnetic field distribution between the power receiving coil and the power transmitting coil provided in an embodiment of the present application;

[0070] Fig. 9 is a schematic diagram of the magnetic field distribution of the magnetic isolation sheet provided in an embodiment of the present application;

[0071] Fig.10 It is a structural schematic diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0072] Fig.11 is a schematic diagram of the positional relationship between the first area and the second area in an embodiment of the present application;

[0073] Fig.12 is a schematic structural diagram of the first nanocrystalline layer in an embodiment of the present application;

[0074] Fig.13 is a schematic structural diagram of the first nanocrystalline layer in an embodiment of the present application;

[0075] Fig.14 It is a structural schematic diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0076] Fig.15 is a schematic diagram of the structure of the first area and the third area provided in an embodiment of the present application;

[0077] Fig.16 It is a structural schematic diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0078] Fig.17 It is a structural schematic diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0079] Fig.18 is a schematic diagram of the first notch in an embodiment of the present application;

[0080] Fig.19is a schematic diagram of the first notch in an embodiment of the present application;

[0081] Fig. 20 is a schematic diagram of the magnetic field distribution of the magnetic isolation sheet provided in an embodiment of the present application;

[0082] Fig.21 It is a structural schematic diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0083] Fig. 22 is a schematic diagram of the positional relationship between the first nanocrystal layer and the second nanocrystal layer provided in an embodiment of the present application;

[0084] Fig.23 It is a structural schematic diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0085] Fig.24 is a schematic diagram of the positional relationship between the first nanocrystal layer and the second nanocrystal layer provided in an embodiment of the present application;

[0086] Fig.25 It is a schematic diagram of an electronic device provided by the present application. DETAILED DESCRIPTION

[0087] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, "multiple" means two or more than two.

[0088] In the following, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0089] To facilitate understanding, some of the examples given are provided for reference to the description of concepts related to the embodiments of the present application.

[0090] 1. Wireless charging

[0091] Wireless charging refers to the principle of near-field induction of magnetic field by the wireless charging transmitter to transfer energy to the wireless charging receiver. The wireless charging receiver then converts the received energy into electrical energy and stores it in the battery of the wireless charging receiver to complete the charging of the wireless charging receiver. For example, Figure 1As shown, the power transmission coil 10 in the wireless charging transmitting device (not shown in the figure) transmits energy to the power receiving coil 20 in the wireless charging receiving device (not shown in the figure) through the near-field induction of the magnetic field, and then the wireless charging receiving device (not shown in the figure) converts the energy induced in the power receiving coil 20 into electrical energy and stores it in the battery (not shown in the figure), thereby realizing the wireless charging function. Electronic devices using wireless charging have no exposed conductive interfaces, which not only saves the messy transmission lines between devices, but is also safer.

[0092] 2. Eddy current loss

[0093] When a conductor moves in a non-uniform magnetic field or is in a time-varying magnetic field, the energy loss caused by the induced current in the conductor is called eddy current loss. The closed current lines formed inside the conductor are called eddy currents (also known as Foucault currents). Nanocrystals have very high electrical conductivity, which is 8e5 s / m. The high electrical conductivity will cause serious eddy current losses when nanocrystals are used as magnetic shields in wireless charging devices, which will cause the nanocrystals to heat up during wireless charging.

[0094] 3. Magnetic fragmentation processing

[0095] In order to prevent the nanocrystals from heating up during wireless charging, the nanocrystals are usually broken into a plurality of small fragments with a diameter of about 1 mm. For example, the nanocrystals can be broken into a plurality of small fragments as follows: Figure 2 As shown, it includes multiple small fragments, which are evenly arranged. The process of breaking nanocrystals into multiple small fragments is called crushing magnetism.

[0096] The shapes of the fragmented small pieces may include the following shapes.

[0097] For example, Figure 3 As shown in (a), the shape of the small fragments in the broken magnetic nanocrystals is triangular.

[0098] For example, Figure 3 As shown in (b), the shape of small fragments in the broken magnetic nanocrystals is quadrilateral.

[0099] For example, Figure 3 As shown in (c) in the figure, the shape of small fragments in the broken magnetic nanocrystals is hexagonal.

[0100] For example, Figure 3 As shown in (d) in the figure, the shape of small fragments in the broken magnetic nanocrystals is octagonal.

[0101] It should be understood that the above content and the accompanying drawings are merely examples of the shape and arrangement of the fragmented small fragments, and do not limit the shape and arrangement of the fragmented small fragments of the present application.

[0102] By crushing the nanocrystals, the eddy current loss on the nanocrystals during wireless charging can be reduced, which can effectively alleviate the problem of nanocrystal heating during wireless charging. Crushing the nanocrystals will also reduce the saturation magnetic induction intensity B of the nanocrystals. S value and magnetic permeability, reducing charging efficiency.

[0103] 4. Wireless charging efficiency

[0104] Taking the commonly used transmitter capacitor coil series (series-series, SS) model as an example, the wireless charging efficiency can be calculated by formula (1), where the SS model refers to the compensation model of the coil leakage inductance in the circuit.

[0105]

[0106] Where η represents the transmission efficiency of wireless charging, ω represents the angular frequency of XX, and R L Represents the load resistance, R T Represents the internal impedance of the transmitter, R R Indicates the internal impedance of the receiving end, X R represents the receiving end inductance, and M represents the mutual inductance between the wireless charging transmitter device and the wireless charging receiver device. Wherein, M can be calculated by formula (2).

[0107]

[0108] Where K represents the coupling coefficient, L tx Indicates the self-inductance of the generating coil in the generating equipment, L rx Indicates the self-inductance of the coil to be charged in the device to be charged.

[0109] From the above formula (1), it can be seen that the greater the mutual inductance, the higher the wireless charging efficiency. From formula (2), it can be seen that the greater the coupling coefficient, the greater the coil self-inductance of the power transmission coil, and the greater the coil self-inductance of the power receiving coil, the greater the mutual inductance. In other words, the greater the coupling coefficient, the greater the coil self-inductance of the power transmission coil, and the greater the coil self-inductance of the power receiving coil, the higher the wireless charging efficiency.

[0110] At present, in the field of wireless charging, the induction coil used for wireless charging usually needs to cooperate with a magnetic isolation sheet to realize the function of wireless charging. The use of unbroken magnetic nanocrystals as magnetic isolation sheets can improve the coupling coefficient of the induction coil, while increasing the inductance of the induction coil, thereby improving the mutual inductance M and improving the efficiency of the wireless charging system. Nanocrystals are a material with high saturation magnetic induction intensity, high magnetic permeability, low coercive force and low high-frequency loss. They have excellent comprehensive magnetic properties and are widely used in the field of wireless charging. Since nanocrystals have high electrical conductivity, high electrical conductivity will produce high eddy current losses, causing the nanocrystals to heat up during wireless charging. In order to avoid heating of nanocrystalline materials during wireless charging, the nanocrystalline materials are usually subjected to magnetic fragmentation treatment, that is, the nanocrystals are processed into multiple nanocrystalline fragments with a diameter of about 1 mm. After the nanocrystals are subjected to magnetic fragmentation treatment, the eddy current losses on them are greatly reduced, which effectively avoids the problem of heating of nanocrystalline materials during wireless charging. However, the saturation magnetic induction intensity B of the nanocrystalline material after magnetic fragmentation treatment S The value and magnetic permeability are low, resulting in low charging efficiency of wireless charging devices that use nanocrystals after crushing as magnetic isolation sheets.

[0111] In view of this, the embodiments of the present application provide a magnetic isolation sheet, a coil module and an electronic device for solving the above-mentioned problem of low charging efficiency. The magnetic isolation sheet provided by the embodiments of the present application can be applied to the coil module in the wireless charging device. The magnetic isolation sheet includes a first nanocrystal layer, and the first nanocrystal layer includes a first region in the shape of a non-closed ring, wherein the material of the first region is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the shape of the first region is a non-closed ring, that is, there is a gap in the first region, the gap in the first region can avoid the change in magnetic flux generated when the magnetic lines pass through the nanocrystals, thereby avoiding eddy current losses caused by the change in magnetic flux and avoiding the problem of heating generated by the nanocrystals during the wireless charging process. In addition, since the first region in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, the saturation magnetic induction intensity B of the nanocrystals in the first region S The value and magnetic permeability are high, so that the wireless charging device to which the magnetic isolation sheet is applied has a high charging efficiency. In summary, the magnetic isolation sheet provided by the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0112] The application scenarios provided by the embodiments of the present application are described below with reference to the accompanying drawings.

[0113] The magnetic isolation sheet provided in the embodiment of the present application can be used in a wireless charging device. The wireless charging device can refer to a wireless charging transmitting device or a wireless charging receiving device, and the embodiment of the present application does not limit this.

[0114] For example, Figure 4As shown in (a), in the wireless charging system composed of the active pen 10A and the tablet computer 10B, the tablet computer 10B acts as a wireless charging transmitter device to wirelessly charge the active pen 10A, which is a wireless charging receiver device. The magnetic isolation sheet provided in the embodiment of the present application can be applied to the active pen 10A or the tablet computer 10B, and the embodiment of the present application does not limit this.

[0115] For example, Figure 4 As shown in (b), in the wireless charging system composed of the smart bracelet 20A and the wireless charging plate 20B, the wireless charging plate 20B acts as a wireless charging transmitter device to wirelessly charge the smart bracelet 20A, which is a wireless charging receiver device. The magnetic isolation sheet provided in the embodiment of the present application can be applied to the smart bracelet 20A or the wireless charging plate 20B, and the embodiment of the present application does not limit this. Figure 4 As shown in (b), the display screen of the smart bracelet 20A can be circular or rectangular, and this embodiment of the present application is not limited to this.

[0116] For example, Figure 4 As shown in (c), in the wireless charging system composed of a mobile phone 30A and a wireless charging plate 30B, the wireless charging plate 30B acts as a wireless charging transmitter device to wirelessly charge the wireless charging receiver device mobile phone 30A, and the present application embodiment does not limit this. The magnetic isolation sheet provided in the present application embodiment can be applied to the mobile phone 30A or the wireless charging plate 30B.

[0117] It should be understood that the wireless charging transmitting device can transfer the power of its own battery to the wireless charging receiving device in the form of a near-field magnetic field to wirelessly charge it, or it can transfer the power of an external power supply to the wireless charging receiving device in the form of a near-field magnetic field to wirelessly charge it. The embodiments of the present application are not limited to this.

[0118] For example, Figure 4 As shown in (a) in FIG. 1 , the tablet computer 10B transfers the electric energy of its own battery to the active pen 10A in the form of a near-field magnetic field to wirelessly charge the active pen 10A.

[0119] For example, Figure 4 As shown in (b), the wireless charging plate 20B transfers the electric energy of the external power supply to the smart bracelet 20A in the form of a near-field magnetic field to wirelessly charge it.

[0120] For example, Figure 4 As shown in (c) in the figure, the wireless charging plate 30B transfers the electric energy of the external power source to the mobile phone 30A in the form of a near-field magnetic field to wirelessly charge it.

[0121] It should be understood that the above is an example of an application scenario and does not limit the application scenario of the present application.

[0122] Combine the following Figures 5 to 24 The magnetic isolation sheet provided in the embodiments of the present application is described in detail.

[0123] Figure 5 This is a schematic diagram of the structure of the magnetic isolation sheet provided in the embodiment of the present application, wherein: Figure 5 (a) is the front view of the magnetic isolation plate. Figure 5 (b) is a top view of the first nanocrystalline layer 111. Figure 5 (c) is a cross-sectional view of the magnetic isolation sheet. The magnetic isolation sheet is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer 111. Figure 5 As shown in (b), the first nanocrystalline layer 111 includes a first region 1111, and the shape of the first region 1111 is a non-closed ring. The first region 1111 in the first nanocrystalline layer 111 is nanocrystalline that has not been subjected to magnetic fragmentation treatment.

[0124] It should be understood that the first nanocrystalline layer 111 includes the first region 1111. In a possible case, the first nanocrystalline layer 111 may also include other regions. When the first nanocrystalline layer 111 includes only the first region 1111, the first nanocrystalline layer 111 and the first region 1111 refer to the same region.

[0125] It should be understood that the first area 1111 is a non-closed annular area, that is, there is a gap in the first area 1111. The annular shape may refer to a circular ring or other shapes, which is not limited in the embodiment of the present application.

[0126] For example, Figure 6 As shown in (a) in FIG. 1 , the first region 1111 may be a non-closed triangular ring.

[0127] For example, Figure 6 As shown in (b) in FIG. 1 , the first region 1111 may be a non-closed hexagonal ring.

[0128] For example, Figure 6 As shown in (c) in FIG. 1 , the first region 1111 may be in the shape of a non-closed circular ring.

[0129] In a possible case, the first area 1111 may also be in the shape of a non-closed irregular ring, which is not limited in this embodiment of the present application.

[0130] Alternatively, if Figure 5As shown in (c), the first area 1111 can also be at least two concentric annular areas, wherein the at least two concentric annular areas include a first annular area 1111A and a second annular area 1111B, and the inner diameter of the first annular area 1111A is greater than the outer diameter of the second annular area 1111B.

[0131] It should be understood that when the first area 1111 is at least two concentric annular areas, the first area 1111 includes at least two concentric annular areas. It can be two concentric annular areas or multiple concentric annular areas, and the embodiment of the present application is not limited to this. Among them, the at least two concentric annular areas include a first annular area 1111A and a second annular area 1111B. When the at least two concentric annular areas are two concentric annular areas, the first annular area 1111A may refer to the outer annular area, and the second annular area 1111B may refer to the inner annular area. When the at least two concentric annular areas are more than two concentric annular areas, the first annular area 1111A may be multiple annular areas on the outer side, and the second annular area 1111B may be an inner annular area, or the first annular area 1111A may be an outermost annular area, and the second annular area 1111B may be multiple inner annular areas. Since the inner diameter of the first ring 1111A is greater than the outer diameter of the second ring 1111B, that is to say, there is an empty ring area between the first ring 1111A and the second ring 1111B.

[0132] For example, Figure 6 As shown in (d), the first area 1111 may be two concentric annular areas, including a first annular area 1111A and a second annular area 1111B, and there is an empty annular area 1111C between the first annular area 1111A and the second annular area 1111B.

[0133] For example, Figure 6 As shown in (e), the first area 1111 may be three concentric annular areas, including two first annular areas 1111A and one second annular area 1111B, and there are two empty annular areas 1111C between the first annular areas 1111A and the second annular areas 1111B.

[0134] It should be understood that the at least two concentric annular areas may also refer to annular shapes of other shapes, such as a triangular annular shape or a hexagonal annular shape.

[0135] For example, Figure 6 As shown in (f) in FIG. 1 , the first region 1111 may be two concentric triangular rings, including a first ring 1111A and a second ring 1111B, wherein the inner diameter of the first ring 1111A is greater than the outer diameter of the second ring 1111B.

[0136] For example, Figure 6 As shown in (g), the first region 1111 may be two concentric hexagonal rings, including a first ring 1111A and a second ring 1111B, wherein the inner diameter of the first ring 1111A is greater than the outer diameter of the second ring 1111B.

[0137] In a possible case, the magnetic isolation sheet 110 may include multiple layers of nanocrystals. In the case where the magnetic isolation sheet 110 includes multiple layers of nanocrystals, all nanocrystal layers in the multiple layers of nanocrystals may be the first nanocrystal layer 111 .

[0138] In a possible case, the magnetic isolation sheet 110 may include only one layer of nanocrystals, that is, the first nanocrystal layer 111 . In this case, the magnetic isolation sheet 110 refers to the first nanocrystal layer 111 .

[0139] For example, Figure 5 As shown in (a) , the magnetic isolation sheet 110 has two layers, including a first nanocrystalline layer 111 .

[0140] For example, Figure 7 As shown in (a) , the magnetic isolation sheet 110 has three layers, including a first nanocrystalline layer 111 .

[0141] For example, Figure 7 As shown in (b) , the magnetic isolation sheet 110 has three layers, wherein all three layers are the first nanocrystalline layer 111 .

[0142] For example, Figure 7 As shown in (c) , the number of layers of the magnetic isolation sheet 110 is 1. In this case, the magnetic isolation sheet 110 is also the first nanocrystalline layer 111 .

[0143] The above is an explanation of the structure of the magnetic isolation sheet provided in the embodiment of the present application. The following will describe in detail the principle of how the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals.

[0144] It should be understood that the magnetic isolation sheet is usually arranged below the induction coil. The induction coil may be a power transmission coil in a wireless charging transmitter device, or a power receiving coil in a wireless charging receiver device, which is not limited in the present application.

[0145] The following description takes the induction coil as the receiving coil in the wireless charging receiving device as an example. When the wireless charging transmitting device starts to transmit power to the wireless charging receiving device, the transmitting coil in the wireless charging transmitting device and the receiving coil in the wireless charging receiving device are both powered on, and an induced magnetic field exists between the wireless charging transmitting device and the wireless charging receiving device.

[0146] For example, a magnetic field distribution diagram of an induced magnetic field between a wireless charging transmitting device and a wireless charging receiving device can be as follows: Figure 8 As shown. Among them, between the power transmitting coil and the power receiving coil, the direction of the magnetic field is parallel to the plane where the power transmitting coil is located and the plane where the power receiving coil is located. In other words, no large magnetic flux change will be generated between the power receiving coil and the power transmitting coil, and therefore no large eddy current loss will be generated. There is a magnetic field perpendicular to the plane where the power receiving coil is located at the edge of the power receiving coil, and the magnetic lines of force in these magnetic fields will produce a large magnetic flux change. In the magnetic isolation sheet provided in the embodiment of the present application, the first area in the first nanocrystalline layer can be a non-closed annular area, that is, there is a gap in the first area, and the gap can reduce the magnetic flux change when the magnetic lines of force pass through the nanocrystals, thereby avoiding the magnetic flux change caused by the magnetic lines of force at the edge of the power receiving coil, and further avoiding the eddy current loss caused by the magnetic flux change. The magnetic isolation sheet provided in the embodiment of the present application may also have a first region in the first nanocrystal layer that is at least two concentric rings, that is, there is at least one empty ring region between the at least two concentric ring regions in the first region. The empty ring region can reduce the magnetic flux change when the magnetic lines of force pass through the nanocrystals, thereby avoiding the magnetic flux change caused by the magnetic lines of force at the edge of the power receiving coil, and further avoiding eddy current losses caused by the magnetic flux change.

[0147] In this case, there is no need to perform magnetic crushing on the nanocrystals to reduce eddy current losses. Since the nanocrystals in the magnetic isolation sheet have not been subjected to magnetic crushing, the saturation magnetic induction intensity B of the nanocrystals is S The value and magnetic permeability will not be reduced, that is, the mutual inductance of the power receiving coil of the wireless charging receiving device will not be reduced. Compared with the use of nanocrystals after crushing magnets as magnetic isolation sheets in the prior art, the mutual inductance of the power receiving coil using the magnetic isolation sheet provided by the embodiment of the present application is higher than the mutual inductance of the power receiving coil in the prior art. Therefore, the wireless charging efficiency of the wireless charging device using the magnetic isolation sheet provided by the embodiment of the present application is high.

[0148] The effect of the magnetic isolation sheet provided in the embodiment of the present application on improving the wireless charging efficiency of the wireless charging device is described below with reference to the accompanying drawings.

[0149] For example, Fig. 9 The following is a schematic diagram of the magnetic field intensity distribution on two different magnetic isolation sheets used in smart watches. Fig. 9 (a) shows that the multilayer nanocrystals in the magnetic isolation sheet are nanocrystals that have been treated with magnetic fragments. Fig. 9 (b) in the figure is a magnetic isolation sheet using the magnetic isolation sheet provided in the embodiment of the present application. Fig. 9 The magnetic isolation sheet in (b) and Fig. 9 Compared with the magnetic isolation sheet in (a), Fig. 9 The nanocrystalline layer in the magnetic isolation sheet in (b) is a non-closed annular region, while Fig. 9 The magnetic isolation plate in (a) is annular. It can be seen that Fig. 9 In (a), there are multiple eddy current losses on the magnetic isolation plate. Fig. 9 The magnetic shield in (b) has no obvious eddy current loss. Fig. 9 The magnetic isolation sheet shown in (b) can avoid eddy current loss on the magnetic isolation sheet.

[0150] Further, Fig. 9 The magnetic isolation sheet in (a) has a nanocrystal loss of 636.91 mW, and the charging efficiency of the wireless charging device using the magnetic isolation sheet is 79.25%. Fig. 9 The magnetic isolation sheet (b) has a nanocrystal loss of 102.78 mW, and the charging efficiency of the wireless charging device using this magnetic isolation sheet is 84.05%. Fig. 9 The magnetic isolation sheet shown in (b) has greatly reduced nanocrystal loss, which significantly improves the efficiency of the wireless charging device.

[0151] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer, and the first nanocrystalline layer includes a first region in the shape of a non-closed ring, wherein the material of the first region is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the shape of the first region is a non-closed ring, that is, there is a gap in the first region that runs through the first region, the gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by magnetic flux changes, that is, avoiding the heating of the nanocrystalline material during the wireless charging process. At the same time, when the first nanocrystalline layer is used to avoid the heating of the nanocrystals during the wireless charging process, the first region in the first nanocrystalline layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystalline layer S The value and magnetic permeability will not be reduced, so the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0152] In a possible case, the first region in the first nanocrystal layer also includes a second region, and the first nanocrystal layer is a processed nanocrystal in the second region. Figures 10 to 13 The illustrated embodiment is described in detail.

[0153] Fig.10 This is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein: Fig.10(a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, Fig.10 (b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application, Fig.10 (c) is a side view of the magnetic isolation sheet provided in the embodiment of the present application, as shown in FIG. Fig.10 As shown, the magnetic isolation sheet 110 includes a first nanocrystalline layer 111. Fig.10 As shown in (b), the first nanocrystalline layer includes a first region 1111 and a second region 1112, the first region 1111 is a non-closed annular region, the second region 1112 is on the inner and outer sides of the first region 1111, the first region 1111 in the first nanocrystalline layer 111 is nanocrystal that has not been subjected to magnetic fragmentation treatment, and the second region 1112 in the first nanocrystalline layer 111 is nanocrystal that has been subjected to magnetic fragmentation treatment.

[0154] The second region 1112 is located inside the first region 1111 , or the second region 1112 is located outside the first region 1111 , or the second region 1112 is located inside and outside the first region 1111 . Fig.10 The second region 1112 shown is only an example.

[0155] For example, Fig.11 As shown in (a) in FIG. 1 , the second region 1112 may be only on the inner side of the first region 1111 .

[0156] For example, Fig.11 As shown in (b) in FIG. 1 , the second region 1112 may be only outside the first region 1111 .

[0157] For example, Fig.11 As shown in (c) in FIG. 1 , the second region 1112 may be located inside or outside the first region 1111 .

[0158] It should be understood that the second area 1112 may be the same as or different from the ring shape of the first area 1111, and this is not limited in this embodiment of the present application.

[0159] For example, Fig.12 As shown in (a), the first area 1111 is a non-closed circular ring, and the second area 1112 is inside the first area 1111, and the second area 1112 is also circular.

[0160] For example, Fig.12 As shown in (b), the first area 1111 is a non-closed circular ring, the second area 1112 is inside the first area 1111, and the second area 1112 is a triangle.

[0161] For example, Fig.12As shown in (c) , the first region 1111 is a non-closed hexagonal ring, the second region 1112 is inside the first region 1111 , and the second region 1112 is a circle.

[0162] For example, Fig.12 As shown in (d), the first area 1111 is a non-closed hexagonal ring, the second area 1112 is outside the first area 1111, and the second area 1112 is a circular ring.

[0163] For example, Fig.12 As shown in (e), the first area 1111 is a non-closed circular ring, and the second area 1112 is outside the first area 1111, and the second area 1112 is a circular ring.

[0164] For example, Fig.12 As shown in (f) in the figure, the first area 1111 is a non-closed circular ring, the second area 1112 is outside the first area 1111, and the second area 1112 is a hexagonal ring.

[0165] For example, Fig.12 As shown in (g), the first area 1111 is a non-closed circular ring, and the second area 1112 is located inside and outside the first area 1111. On the inner side of the first area 1111, the second area 1112 is circular, and on the outer side of the first area, the second area 1112 is a circular ring.

[0166] For example, Fig.12 As shown in (h), the first area 1111 is a non-closed hexagonal ring, and the second area 1112 is located inside and outside the first area 1111. On the inside of the first area 1111, the second area 1112 is a circle, and on the outside of the first area, the second area 1112 is a circular ring.

[0167] For example, Fig.12 As shown in (i), the first region 1111 includes a first ring 1111A and a second ring 1111B, and the second region 1112 is located inside and outside the first region 1111. On the inside of the first region 1111, the second region 1112 is circular, and on the outside of the first region, the second region 1112 is annular.

[0168] It should be understood that Figure 5 In the edge area of ​​the magnetic isolation sheet shown in the figure, there are magnetic lines of force perpendicular to the plane where the power receiving coil is located. Figure 8 As shown in FIG. 1 , these magnetic lines of force will produce a large magnetic flux change, which is easy to produce eddy current loss. Therefore, the first nanocrystalline layer 111 can be Figure 5On the basis of the magnetic isolation sheet shown in FIG. 1 , a second region 1112 is added, and the first nanocrystalline layer 111 is nanocrystalline treated with magnetic fragmentation on the second region 1112. The second region 1112 is located inside and / or outside the first region 1111, that is, the second region 1112 is at the edge of the first region 1111. Since the first nanocrystalline layer 111 is nanocrystalline treated with magnetic fragmentation on the second region 1112, it is equivalent to Figure 5 The edge area of ​​the magnetic isolation plate shown in the figure is newly added with nanocrystals that have undergone magnetic fragmentation treatment. The newly added nanocrystals that have undergone magnetic fragmentation treatment (equivalent to the second area 1112) can effectively reduce the eddy current loss caused by the magnetic flux change in the edge area, that is, avoid the heating of the magnetic isolation plate caused by large eddy current losses.

[0169] The magnetic isolation sheet provided in the embodiments of the present application is applied to the coil module in the wireless charging device, including at least one layer of nanocrystals, wherein the at least one layer of nanocrystals includes a first nanocrystal layer, and the first nanocrystal layer includes a first area and a second area, wherein the first area is a non-closed annular area, and the second area is on the inner and / or outer side of the first area, and the first area in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the second area is nanocrystals that have been subjected to magnetic fragmentation treatment. This is equivalent to adding nanocrystals that have been subjected to magnetic fragmentation treatment to the edge area of ​​the first area, and the eddy current loss caused by the magnetic flux change in the edge area of ​​the first area is reduced by the nanocrystals that have been subjected to magnetic fragmentation treatment on the edge area of ​​the first area, thereby further avoiding the heating of the magnetic isolation sheet caused by eddy current loss.

[0170] Optionally, the second region 1112 and the first region 1111 are adjacent to each other.

[0171] For example, Fig.13 As shown, the first area 1111 is a non-closed circular ring, and the second area 1112 is inside and outside the first area 1111. Inside the first area 1111, the second area 1112 is a circular area, and outside the first area, the second area 1112 is a circular ring area. The circular area inside the first area 1111 and the circular ring area outside the first area 1111 are both connected to the first area 1111. This is equivalent to the edge area of ​​the first area 1111 being provided with nanocrystals that have been treated with crushed magnets.

[0172] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and includes at least one layer of nanocrystals, wherein the at least one layer of nanocrystals includes a first nanocrystal layer, and the first nanocrystal layer includes a first area and a second area, wherein the first area is a non-closed annular area, and the second area is on the inner side and / or the outer side of the first area, and the first area is connected to the second area, wherein the first area in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the second area is nanocrystals that have been subjected to magnetic fragmentation treatment. Since the first area and the second area are connected, the nanocrystals that have been subjected to magnetic fragmentation treatment are added to the edge area of ​​the first area, and the eddy current loss caused by the change of magnetic flux is reduced by the nanocrystals that have been subjected to magnetic fragmentation treatment on the edge area of ​​the first area, thereby further avoiding the heating of the magnetic isolation sheet caused by eddy current loss.

[0173] In one possible case, the first nanocrystal layer further includes a third region, and the material of the third region is also untreated nanocrystal. Figure 14 to Figure 15 The illustrated embodiment is described in detail.

[0174] Fig.14 This is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein: Fig.14 (a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, Fig.14 (b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application, as shown in FIG. Fig.14 As shown, the magnetic isolation sheet 110 includes a first nanocrystalline layer 111. The first nanocrystalline layer includes a first region 1111 and a third region 1113 concentrically arranged with the first region 1111. The first region 1111 is a non-closed annular region, and the third region 1113 is a non-closed annular region. The materials of the first region 1111 and the third region 1113 are nanocrystalline that have not been subjected to magnetic crushing treatment.

[0175] The third region 1113 may be located inside the first region 1111 or outside the first region 1111 , which is not limited in the embodiment of the present application.

[0176] For example, Fig.14 (a) and Fig.14 As shown in (b) , the third region 1113 may be outside the first region 1111 .

[0177] For example, Fig.14 (c) and Fig.14 As shown in (d) , the third region 1113 may be on the inner side of the first region 1111 .

[0178] Since the third region 1113 is in the shape of a non-closed ring, there is a gap that passes through the inner diameter and the outer diameter in the third region 1113 . Similarly, the first region 1111 is also in the shape of a non-closed ring, so there is a gap that passes through the inner diameter and the outer diameter in the first region 1111 .

[0179] The shape of the notch on the first area 1111 and the shape of the notch on the third area 1113 may be the same or different, and this embodiment of the present application does not limit this.

[0180] The position of the notch on the first area 1111 and the position of the notch on the third area 1113 may be the same or different, and this embodiment of the present application does not limit this.

[0181] For example, Fig.15 As shown in (a), the notch on the first area 1111 is on the right side of the first area 1111, and the notch on the third area 1113 is also on the right side of the third area 1113. The position of the notch on the first area 1111 is the same as the position of the notch on the third area 1113.

[0182] For example, Fig.15 As shown in (b), the notch on the first area 1111 is on the left side of the first area 1111, and the notch on the third area 1113 is also on the right side of the third area 1113. The position of the notch on the first area 1111 is different from the position of the notch on the third area 1113.

[0183] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer, and the first nanocrystalline layer includes a first area in the shape of a non-closed ring, and a third area arranged concentrically with the first area, and the shape of the third area is also a non-closed ring. Among them, the materials of the first area and the third area are nanocrystals that have not been treated with magnetic fragmentation. Since the shapes of the first area and the third area are non-closed rings, that is, there are gaps in the first area and the third area that pass through the first area. The gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by magnetic flux changes, that is, avoiding the heating of the nanocrystalline material during wireless charging. At the same time, when the first nanocrystalline layer is used to avoid the heating of nanocrystals during wireless charging, the first area and the third area in the first nanocrystalline layer are nanocrystals that have not been treated with magnetic fragmentation, so that the saturation magnetic induction intensity B of the first nanocrystalline layer S The value and magnetic permeability will not be reduced, so the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0184] In one possible case, the first nanocrystal layer further includes a fourth region, and the material of the fourth region is also untreated nanocrystal. Fig.16 The illustrated embodiment is described in detail.

[0185] Fig.16 This is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein: Fig.16 (a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, Fig.16 (b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application, as shown in FIG. Fig.16 As shown, the magnetic isolation sheet 110 includes a first nanocrystalline layer 111. The first nanocrystalline layer includes a first region 1111 and a fourth region 1114 concentrically arranged with the first region 1111. The first region 1111 is in the shape of an open ring, the fourth region 1114 is in the shape of a closed ring, the outer diameter of the fourth region 1114 is smaller than the inner diameter of the first region 1111, and the materials of the first region 1111 and the fourth region 1114 are both nanocrystalline that have not been subjected to magnetic crushing treatment.

[0186] It should be understood that the outer diameter of the fourth region 1114 is smaller than the inner diameter of the first region 1111 , that is, the fourth region 1114 is on the inner side of the first region 1111 .

[0187] When the fourth region 1114 is on the inner side of the first region 1111, it is equivalent to the existence of a gap on the outer side of the first nanocrystal layer 111 (the first region 1111). The gap on the outer side of the first nanocrystal layer 111 can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystals, thereby avoiding eddy current losses caused by the change of magnetic flux.

[0188] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer, and the first nanocrystalline layer includes a first area in the shape of a non-closed ring, and a fourth area arranged concentrically with the first area, the shape of the fourth area is a closed ring, and the outer diameter of the fourth area is smaller than the inner diameter of the first area, which is equivalent to the first area being outside the fourth area, and the materials of the first area and the fourth area are nanocrystalline that have not been subjected to magnetic fragmentation treatment. Since the shape of the first area is a non-closed ring, and the first area is outside the fourth area, it is equivalent to the existence of a gap on the outside of the first nanocrystalline layer, through which the magnetic flux change when the magnetic lines of force in the magnetic field pass through the nanocrystal can be avoided, thereby avoiding eddy current loss caused by magnetic flux change, that is, avoiding the heating of the nanocrystalline material during the wireless charging process. At the same time, when the first nanocrystalline layer is used to avoid the heating of the nanocrystal during the wireless charging process, the first area and the fourth area in the first nanocrystalline layer are nanocrystals that have not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystalline layer S The value and magnetic permeability will not be reduced, so the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied will not be reduced. In summary, the magnetic isolation sheet provided in the embodiment of the present application can improve the wireless charging efficiency while avoiding the heating of nanocrystals during wireless charging.

[0189] In one possible case, the size of the electronic device to which the magnetic isolation sheet is applied is relatively large, for example, the magnetic isolation sheet is applied to a mobile phone. Since the battery capacity of a mobile phone is usually relatively large, the size of the magnetic isolation sheet used is also correspondingly larger. The larger the size of the magnetic isolation sheet, the greater the eddy current loss on it. Based on this, a notch can be added to the first area to reduce the heat caused by eddy current loss on the magnetic isolation sheet. Figures 17 to 20 The illustrated embodiment is described in detail.

[0190] Fig.17 This is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein: Fig.17 (a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, Fig.17 (b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application, as shown in FIG. Fig.17 As shown, the magnetic isolation sheet has at least one layer of nanocrystals 110, and at least one layer of nanocrystals 110 includes a first nanocrystal layer 111. Fig.17As shown in (b), the first nanocrystalline layer includes a first region 1111 and a second region 1112, the first region 1111 is a non-closed annular region, the first region 1111 includes at least one first gap 111A, the second region 1112 is around the first region 1111, the first region 1111 in the first nanocrystalline layer 111 is nanocrystal that has not been subjected to magnetic fragmentation treatment, and the second region 1112 in the first nanocrystalline layer 111 is nanocrystal that has been subjected to magnetic fragmentation treatment.

[0191] It should be understood that the first notch 111A refers to a notch that runs through the inner diameter and the outer diameter of the first region 1111 .

[0192] For example, Fig.18 As shown in (a) in FIG. 1 , the first gap 111A may be an area where two straight lines radiating outward from the center of the annular area where the first area 1111 is located intersect with the first area.

[0193] For example, Fig.18 As shown in (b) in FIG. 1 , the first notch 111A may also be rectangular.

[0194] The embodiment of the present application does not limit the shape of the first notch 111A, as long as the first notch 111A can penetrate the inner diameter and the outer diameter of the first region 1111 .

[0195] It should be understood that the number of the first notches 111A may be one or more, and this is not limited in the embodiment of the present application.

[0196] For example, Fig.19 As shown in (a) in FIG. 1 , the number of the first notch 111A is one.

[0197] For example, Fig.19 As shown in (b) , the number of first notches 111A is three.

[0198] It should be understood that the first notch 111A can be set at any position in the first region, and the embodiment of the present application is not limited to this, as long as the first notch 111A can penetrate the inner diameter and the outer diameter of the first region 1111.

[0199] When the size of the magnetic separator is large, Figures 5 to 13 On the basis of the shown embodiment, a notch is added on the first area so that the magnetic field between the wireless charging transmitting device and the wireless charging receiving device, which is perpendicular to the plane where the power receiving coil is located, can be released through the notch on the first area to reduce eddy current losses on the magnetic isolation sheet, thereby avoiding heating of the magnetic isolation sheet due to large eddy current losses.

[0200] Below through Fig. 20To illustrate the effect of adding a magnetic isolation plate with a first gap in the first area.

[0201] For example, Fig. 20 As shown, schematic diagrams of the magnetic field intensity distribution on three magnetic isolation sheets used in smart watches are provided respectively.

[0202] in, Fig. 20 (a) is a magnetic field intensity distribution diagram of a magnetic isolation sheet with a first notch 111A added to the first region 1111. Fig. 20 (b) is a magnetic field intensity distribution diagram of the magnetic isolation sheet with two first gaps 111A added to the first area 1111. Fig. 20 (c) is a magnetic field intensity distribution diagram of the magnetic isolation sheet with three first gaps 111A added to the first area 1111.

[0203] Depend on Fig. 20 It can be seen that by adding one first notch 111A to the first region 1111, the eddy current loss is reduced, the nanocrystal loss is 99.42mW, and the efficiency of the wireless charging device is 84.12%. By adding two first notches 111A to the first region 1111, the eddy current loss is reduced, the nanocrystal loss is 101.87mW, and the efficiency of the wireless charging device is 84.09%. By adding one first notch 111A to the first region 1111, the eddy current loss is reduced, the nanocrystal loss is 100.59mW, and the efficiency of the wireless charging device is 84.09%.

[0204] The magnetic isolation sheet provided in the embodiment of the present application can be applied to the coil module in the wireless charging device, which includes at least one layer of nanocrystals, at least one layer of nanocrystals includes a first nanocrystal layer, and the first nanocrystal layer includes a first area and a second area, wherein the first area is a non-closed annular area, the second area is on the inner side and / or the outer side of the first area, the first area is connected to the second area, the first area in the first nanocrystal layer is a nanocrystal that has not been subjected to magnetic crushing treatment, and the second area is a nanocrystal that has been subjected to magnetic crushing treatment. When the size of the magnetic isolation sheet is greater than the preset threshold, the first area includes at least one first gap, wherein, since the first area is a non-closed annular area, since the first area includes at least one first gap, it is equivalent to having two or more gaps on an annular area, and the above two or more gaps are respectively a gap that makes the annular area not closed, and at least one first gap existing in the first area. Exemplarily, when the first area includes 1 first gap, there are equivalent to 2 gaps on the first nanocrystal layer, which are respectively a gap that makes the annular area not closed and 1 first gap. Exemplarily, when the first region includes two first gaps, there are equivalently three gaps on the first nanocrystalline layer, namely, a gap that makes the annular region not closed and two first gaps. In this way, the magnetic field between the wireless charging transmitter device and the wireless charging receiver device, which is perpendicular to the plane where the power receiving coil is located, can be released through the gaps on the first region to reduce the eddy current loss on the magnetic isolation sheet, thereby avoiding the eddy current loss caused by the large size of the magnetic isolation sheet, and further avoiding the heating of the magnetic isolation sheet caused by the large eddy current loss.

[0205] The above embodiments focus on the specific situation of the nanocrystalline layer on the magnetic isolation sheet. Generally, the magnetic isolation sheet may include multiple nanocrystalline layers. The structures of the nanocrystalline layers may be the same or different, and the embodiments of the present application do not limit this. Figure 21 to Figure 24 The embodiments shown are used to explain in detail the different specific situations of the structures of each nanocrystalline layer.

[0206] Fig.21 A schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein: Fig.21 (a) is the front view of the magnetic isolation plate. Fig.21 (b) is a cross-sectional view of the magnetic isolation sheet. The magnetic isolation sheet is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes at least one layer of nanocrystals 110, and the at least one layer of nanocrystals 110 includes a first nanocrystal layer 111 and a second nanocrystal layer 112. Fig.21As shown in (b), the first nanocrystalline layer includes a first region 1111 and a second region 1112, the first region 1111 is a non-closed annular region, and the second region 1112 is located inside and outside the first region 1111. The first region 1111 in the first nanocrystalline layer 111 is nanocrystalline that has not been subjected to magnetic fragmentation treatment, the second region 1112 in the first nanocrystalline layer 111 is nanocrystalline that has been subjected to magnetic fragmentation treatment, and the second nanocrystalline layer 112 is nanocrystalline that has been subjected to magnetic fragmentation treatment.

[0207] It should be understood that the magnetic isolation sheet generally includes multiple layers of nanocrystals. The structures of the nanocrystals in each layer may be the same or different, and the present application embodiment does not limit this. Fig.21 The magnetic isolation sheet shown includes three layers of nanocrystals, two of which are first nanocrystal layers 111 and one is second nanocrystal layer 112. The layers of nanocrystals can be connected by double-sided adhesive or by other adhesive materials, which is not limited in the present embodiment. A covering film can be provided above and below the magnetic isolation sheet, respectively.

[0208] It should be understood that at least one layer of nanocrystals 110 in the magnetic isolation sheet is usually stacked, so the first nanocrystal layer 111 is usually arranged above or below the second nanocrystal layer 112, and the embodiment of the present application is not limited to this.

[0209] Optionally, the projection of the first nanocrystal layer 111 and the projection of the second nanocrystal layer 112 overlap.

[0210] The magnetic isolation sheet provided in the embodiments of the present application includes at least one layer of nanocrystals, and the at least one layer of nanocrystals includes a first nanocrystal layer and a second nanocrystal layer, wherein the first nanocrystal layer includes a first area, and the first area is a non-closed annular area. The first area on the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the second nanocrystal layer is nanocrystals that have been subjected to magnetic fragmentation treatment. Since the first area on the first nanocrystal layer is a non-closed annular area, the manufacturing process of the first nanocrystal layer is relatively complicated, and the manufacturing process of the second nanocrystal layer is relatively simple. The embodiments of the present application can reduce the manufacturing difficulty of the magnetic isolation sheet by adopting the second nanocrystal layer with a relatively simple manufacturing process as one of the nanocrystal layers in the at least one layer of nanocrystals.

[0211] It should be understood that the magnetic isolation sheet is usually combined with the induction coil as a coil module in the wireless charging device.

[0212] Exemplarily, the magnetic isolation sheet is combined with the power transmission coil to serve as a coil module in a wireless charging transmitter device.

[0213] Exemplarily, the magnetic isolation sheet is combined with the power receiving coil to serve as a coil module in a wireless charging receiving device.

[0214] That is to say, an induction coil is usually disposed above the magnetic isolation sheet. The second nanocrystalline layer 112 can be disposed above the first nanocrystalline layer 111 or below the first nanocrystalline layer, which is not limited in the embodiment of the present application.

[0215] Optionally, the distance between the second nanocrystalline layer 112 and the induction coil 20 is greater than the distance between the first nanocrystalline layer 111 and the induction coil 20 .

[0216] For example, Fig. 22 As shown in (a) in FIG. 1 , the magnetic isolation sheet includes three layers of nanocrystals, two of which are first nanocrystal layers 111 and one is second nanocrystal layer 112. The magnetic isolation sheet is arranged below the induction coil 20. The distance between the second nanocrystal layer 112 and the induction coil 20 is greater than the distance between the first nanocrystal layer 111 and the induction coil 20. That is, the second nanocrystal layer 112 is below the first nanocrystal layer 111.

[0217] Optionally, the distance between the second nanocrystalline layer 112 and the induction coil 20 is smaller than the distance between the first nanocrystalline layer 111 and the induction coil 20 .

[0218] For example, Fig. 22 As shown in (b), the magnetic isolation sheet includes three layers of nanocrystals, two of which are first nanocrystal layers 111 and one is second nanocrystal layer 112. The magnetic isolation sheet is arranged below the induction coil 20. The distance between the second nanocrystal layer 112 and the induction coil 20 is smaller than the distance between the first nanocrystal layer 111 and the induction coil 20. That is, the second nanocrystal layer 112 is above the first nanocrystal layer 111.

[0219] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module of the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer and a second nanocrystalline layer, wherein the second nanocrystalline layer is nanocrystalline that has been subjected to magnetic fragmentation treatment, and the distance between the second nanocrystalline layer and the induction coil in the coil module is smaller than the distance between the first nanocrystalline layer and the induction coil, so that the magnetic flux change generated when the induction coil is working can be absorbed by the second nanocrystalline layer that is closer to the induction coil, further avoiding eddy current loss on the magnetic isolation sheet, and further avoiding the heat generated by eddy current loss on the magnetic isolation sheet when the first nanocrystalline layer is used to improve the wireless charging efficiency.

[0220] In the case where other nanocrystalline layers are arranged above the first nanocrystalline layer 111, since the first nanocrystalline layer 111 is nanocrystalline without magnetic fragmentation treatment in the first region 1111, the magnetic isolation sheet has a high saturation magnetic induction characteristic in the first region 1111. Therefore, above the first region 1111, there is no need for a nanocrystalline layer to reduce eddy current loss, that is, the induction coil can be directly placed above the first region 1111. Fig.23 The illustrated embodiment is described in detail.

[0221] Fig.23 A schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein: Fig.23 (a) is the front view of the magnetic isolation plate. Fig.23 (b) is a cross-sectional view of the magnetic isolation sheet. The magnetic isolation sheet is applied to the coil module in the wireless charging device, and the magnetic isolation sheet includes at least one layer of nanocrystals 110, and the at least one layer of nanocrystals 110 includes a first nanocrystal layer 111 and a third nanocrystal layer 113. Fig.23 As shown in (b), the first nanocrystalline layer includes a first region 1111 and a second region 1112, the first region 1111 is a non-closed annular region, and the second region 1112 is on the inside and outside of the first region 1111. The first region 1111 in the first nanocrystalline layer 111 is a nanocrystalline that has not been subjected to magnetic fragmentation treatment, and the second region 1112 in the first nanocrystalline layer 111 is a nanocrystalline that has been subjected to magnetic fragmentation treatment. The third nanocrystalline layer 113 includes a third region 1131 and a second notch 1132, the projection of the second notch 1132 overlaps with the projection of the first region 1111, the third region 1131 refers to the region on the third nanocrystalline layer 113 other than the second notch 1132, the third region 1131 in the third nanocrystalline layer 113 is a nanocrystalline that has been subjected to magnetic fragmentation treatment, and the distance between the third nanocrystalline layer 113 and the induction coil 20 in the coil module is less than the distance between the first nanocrystalline layer 111 and the induction coil 20.

[0222] It should be understood that the magnetic isolation sheet generally includes multiple layers of nanocrystals. The structures of the nanocrystals in each layer may be the same or different, and the present application embodiment does not limit this. Fig.23 The magnetic isolation sheet shown includes three layers of nanocrystals, two of which are first nanocrystal layers 111 and one is third nanocrystal layer 113. Each layer of nanocrystals can be connected by double-sided adhesive. A covering film can be provided above and below the magnetic isolation sheet, respectively.

[0223] It should be understood that the magnetic isolation sheet is usually combined with the induction coil as a coil module in the wireless charging device.

[0224] Exemplarily, the magnetic isolation sheet is combined with the power transmission coil to serve as a coil module in a wireless charging transmitter device.

[0225] Exemplarily, the magnetic isolation sheet is combined with the power receiving coil to serve as a coil module in a wireless charging receiving device.

[0226] That is to say, an induction coil is usually arranged above the magnetic isolation sheet.

[0227] It should be understood that at least one layer of nanocrystals 110 in the magnetic isolation sheet is usually stacked. In the embodiment of the present application, at least one layer of nanocrystals 110 includes a first nanocrystal layer 111 and a third nanocrystal layer 113. Usually, the third nanocrystal layer 113 is arranged above the first nanocrystal layer 111. An induction coil is arranged above the magnetic isolation sheet. Since the third nanocrystal layer 113 is arranged above the first nanocrystal layer 111, it is equivalent to that the distance between the third nanocrystal layer 113 and the induction coil is smaller than the distance between the first nanocrystal layer 111 and the induction coil.

[0228] The third nanocrystalline layer 113 includes a third region 1131 and a second notch 1132, and the projection of the second notch 1132 overlaps with the projection of the first region 1111. The third region 1131 refers to the region on the third nanocrystalline layer 113 except the second notch 1132, and the third region 1131 in the third nanocrystalline layer 113 is nanocrystalline that has been subjected to magnetic fragmentation treatment.

[0229] It should be understood that in order to better improve the charging efficiency of the wireless charging device, the first area 1111 is usually set below the induction coil, and the projection of the first area 1111 also overlaps with the projection of the induction coil. In this case, since the projection of the second notch 1132 overlaps with the projection of the first area 1111, it is equivalent to that the second notch 1132 is also below the induction coil, and the projection of the second notch 1132 also overlaps with the projection of the induction coil. In the case where the projection of the second notch 1132 overlaps with the projection of the induction coil, as shown in FIG. Fig.23 As shown in (b) , the induction coil may occupy the space where the second notch 1132 is located.

[0230] It should be understood that the induction coil may occupy the entire space where the second notch 1132 is located, or may occupy a portion of the space where the second notch 1132 is located, and this embodiment of the present application does not limit this.

[0231] For example, Fig.24 As shown in (a) in FIG. 1 , the induction coil occupies the entire space where the second gap 1132 is located.

[0232] For example, Fig.24 As shown in (b) , the induction coil occupies part of the space where the second notch 1132 is located.

[0233] in, Fig.24(a) is a cross-sectional view of a coil module provided in an embodiment of the present application. Fig.24 (a) is a cross-sectional view of another coil module provided in an embodiment of the present application.

[0234] It should be understood that in order to ensure the safety of wireless charging, the thickness of the induction coil needs to be set to a value greater than the thickness threshold. Since the induction coil can occupy the space where the second notch 1132 is located, the thickness of the magnetic isolation sheet can be appropriately reduced while the thickness of the induction coil remains unchanged, thereby reducing the thickness of the coil module.

[0235] The magnetic isolation sheet provided in the embodiment of the present application is applied to the coil module of the wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer and a third nanocrystalline layer, wherein the third nanocrystalline layer includes a third area and a second notch, the projection of the second notch overlaps with the projection of the first area, the third area refers to the area on the third nanocrystalline layer except the second notch, the third area in the third nanocrystalline layer is nanocrystalline that has been subjected to magnetic fragmentation treatment, and the distance between the third nanocrystalline layer and the induction coil in the coil module is less than the distance between the first nanocrystalline layer and the induction coil. This is equivalent to the induction coil being able to occupy the space where the second notch is located on the third nanocrystalline layer, so that when the thickness of the induction coil remains unchanged, the induction coil occupies the space where the second notch is located, thereby reducing the thickness of the magnetic isolation sheet, and then reducing the thickness of the coil module obtained by combining the magnetic isolation sheet and the induction coil, saving space in the wireless charging device.

[0236] In one embodiment of the present application, a coil module is further provided, the coil module comprising the above Figures 5 to 24 The magnetic isolation sheet and the induction coil shown in any one of the embodiments.

[0237] The coil module provided in the embodiment of the present application has the same implementation principle and beneficial effects as Figures 5 to 24 The magnetic isolation sheet shown in any of the embodiments is similar and will not be described again here.

[0238] In a possible case, the projection of the induction coil overlaps with the projection of the first area on the magnetic isolation sheet.

[0239] The coil module provided in the embodiment of the present application includes an induction coil and a magnetic isolation sheet, wherein the magnetic isolation sheet includes at least one layer of nanocrystals, the at least one layer of nanocrystals includes a first nanocrystal layer, the first nanocrystal layer includes a first region, wherein the first region is a non-closed annular region, the first region in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the projection of the first region overlaps with the projection of the induction coil, so that the magnetic field generated when the induction coil is working can be absorbed by the nanocrystals on the first nanocrystal layer that have not been subjected to magnetic fragmentation treatment, thereby avoiding eddy current losses caused by changes in magnetic flux in the magnetic field, and further avoiding heating of the magnetic isolation sheet due to eddy current losses, thereby improving the efficiency of the wireless charging device.

[0240] In a possible case, the projection of the induction coil overlaps with the projection of the first region on the magnetic isolation sheet, and the size of the induction coil is the same as the size of the first region on the magnetic isolation sheet.

[0241] It should be understood that in industrial production, the same size of two objects is usually not exactly the same, and there is a tolerance between the two. Therefore, the same size of the induction coil as the first area on the magnetic isolation sheet means that the induction coil is slightly larger than the first area, or it can also mean that the induction coil is slightly smaller than the first area, and the embodiments of the present application do not limit this.

[0242] Since the projection of the induction coil overlaps with the projection of the first area on the magnetic isolation sheet, and the size of the induction coil is the same as the size of the first area on the magnetic isolation sheet, that is to say, the induction coil is arranged directly above the first area. In this way, the magnetic field generated when the induction coil is working can be absorbed by the nanocrystals that have not been magnetically fragmented directly below it, and there is no need to arrange larger nanocrystals that have not been magnetically fragmented under the induction coil.

[0243] The coil module provided in the embodiment of the present application includes an induction coil and a magnetic isolation sheet, wherein the magnetic isolation sheet includes at least one layer of nanocrystals, the at least one layer of nanocrystals includes a first nanocrystal layer, the first nanocrystal layer includes a first area, wherein the first area is a non-closed annular area, and the first area in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the projection of the first area overlaps with the projection of the induction coil, and the size of the induction coil is the same as the size of the first area on the magnetic isolation sheet, the magnetic field generated when the induction coil is working can be accurately absorbed by the nanocrystals on the first nanocrystal layer that have not been subjected to magnetic fragmentation treatment, thereby avoiding the arrangement of larger-sized nanocrystals that have not been subjected to magnetic fragmentation treatment under the induction coil to absorb the magnetic field generated when the induction coil is working, thereby avoiding the magnetic isolation sheet being too large in size. At the same time, the coil module provided in the embodiment of the present application can also effectively improve the charging efficiency of the wireless charging device through the nanocrystals in the first area that have not been subjected to magnetic fragmentation treatment. That is to say, while avoiding the heating of the magnetic isolation sheet caused by eddy current loss and improving the efficiency of the wireless charging device, the coil module provided in the embodiment of the present application can effectively save the space occupied by the coil module on the electronic device.

[0244] The coil module provided in the embodiment of the present application can be applied to electronic devices. Optionally, the electronic device includes a terminal device, which can also be called a terminal, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc. The terminal device can be a mobile phone, a smart TV, a wearable device, a tablet computer (Pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. The embodiment of the present application does not limit the specific technology and specific device form adopted by the terminal device.

[0245] Optionally, the electronic device may be a wireless charging transmitter device.

[0246] Optionally, the electronic device may be a wireless charging receiving device.

[0247] It should be understood that the implementation principle and beneficial effects of the above electronic equipment are similar to those of the above coil module, Figures 5 to 24 The magnetic isolation sheets described in any one of the items are similar and will not be described in detail here.

[0248] It is understandable that in order to implement the above functions, the electronic device includes hardware and / or software modules corresponding to the execution of each function. In combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application in combination with the embodiments, but such implementation should not be considered to be beyond the scope of the present application.

[0249] The embodiment of the present application can divide the functional modules of the electronic device according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one module. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. It should be noted that the names of the modules in the embodiment of the present application are schematic and are not limited to the names of the modules in actual implementation.

[0250] For example, Fig.25 1 shows a schematic diagram of the structure of the electronic device 100. The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, etc.

[0251] It is to be understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0252] The processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a memory, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU), etc. Different processing units may be independent devices or integrated into one or more processors.

[0253] The charging management module 140 is used to receive charging input from a charger. The charger may be a wireless charger. In some wireless charging embodiments, the charging management module 140 may receive wireless charging input via a wireless charging coil of the electronic device 100. While the charging management module 140 is charging the battery 142, it may also power the electronic device 100 via the power management module 141.

[0254] The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and / or the charging management module 140, and supplies power to the processor 110, the internal memory 121, the external memory, the display screen 194, the camera 193, and the wireless communication module 160. The power management module 141 can also be used to monitor parameters such as battery capacity, battery cycle number, battery health status (leakage, impedance), etc. In some other embodiments, the power management module 141 can also be set in the processor 110. In other embodiments, the power management module 141 and the charging management module 140 can also be set in the same device.

[0255] It should be noted that any electronic device mentioned in the embodiments of the present application may include more or fewer modules in the electronic device 100.

[0256] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0257] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic; for example, the division of the units is only a logical function division, and there may be other division methods in actual implementation; for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0258] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0259] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A coil module, applied to a wireless charging device, characterized in that: The coil module includes a magnetic isolation sheet and an induction coil, wherein the magnetic isolation sheet includes a first nanocrystalline layer, the first nanocrystalline layer includes a first region in the shape of a non-closed ring, wherein the material of the first region is nanocrystals that have not been subjected to magnetic fragmentation treatment, and the projection of the induction coil overlaps with the projection of the first region in the first nanocrystalline layer.

2. The coil module according to claim 1, characterized in that: The first nanocrystal layer further includes a second region, and the second region is arranged around the first region, wherein the material of the second region is nanocrystals that have undergone magnetic crushing treatment.

3. The coil module according to claim 1 or 2, characterized in that: The first region is an open circular ring, wherein the open circular ring penetrates the inner diameter and the outer diameter of the first region.

4. The coil module according to claim 3, characterized in that: The magnetic isolation sheet has three layers, and all of the three layers are first nanocrystalline layers.

5. The coil module according to claim 4, characterized in that: The projections of the non-closed areas of the three first nanocrystal layers overlap.

6. The coil module according to any one of claims 1 to 5, characterized in that: The first region further includes a first notch, wherein the first notch penetrates the inner diameter and the outer diameter of the annular shape of the first region.

7. The coil module according to claim 6, characterized in that: The first gap is an area where two straight lines radiating outward from the center of the annular area where the first area is located intersect with the first area; or the first gap is a rectangle.

8. The coil module according to claim 6 or 7, characterized in that: The number of the first gaps is greater than one.

9. The coil module according to any one of claims 1 to 8, characterized in that: The magnetic isolation sheet further comprises a second nanocrystalline layer, and the material of the second nanocrystalline layer is nanocrystalline that has been subjected to magnetic fragmentation treatment.

10. An electronic device configured to be capable of wireless charging transmission or wireless charging reception, characterized in that: The electronic device comprises the coil module according to any one of claims 1 to 9.

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