Magnetic isolation sheet, coil module and electronic equipment

Abstract

The embodiment of the invention is applicable to the field of wireless charging, and relates to a magnetic isolation sheet, a coil module and electronic equipment, the magnetic isolation sheet is applied to the coil module in the wireless charging equipment, the magnetic isolation sheet comprises a first nanocrystalline layer, the first nanocrystalline layer comprises a first area in a non-closed annular shape, and the first area comprises a second nanocrystalline layer. According to the wireless charging device, the first area is made of nanocrystalline which is not subjected to magnetic crushing treatment, the first area is in the shape of a non-closed ring, namely, a notch penetrating through the first area exists in the first area, magnetic flux change generated when magnetic lines in a magnetic field pass through the nanocrystalline can be avoided through the notch, and heating of the nanocrystalline material in the wireless charging process is avoided. And meanwhile, the material of the first area is nanocrystalline which is not subjected to magnetic crushing treatment, so that the charging efficiency of wireless charging equipment applying the magnetic isolation sheet cannot be reduced. In conclusion, according to the magnetic isolation sheet provided by the embodiment of the invention, the wireless charging efficiency can be improved under the condition that nanocrystalline heating in the wireless charging process is avoided.

Description

Magnetic isolation sheets, coil modules and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on September 13, 2022, with application number 202211110319.0 and application name “Magnetic isolation sheet, coil module and electronic device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of wireless charging, and more specifically, to a magnetic isolation sheet, 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 be combined with a magnetic isolation sheet to achieve the wireless charging function. Among them, the magnetic isolation sheet is usually made of nanocrystalline material.

[0004] Nanocrystalline materials are materials with high saturation magnetic induction, high magnetic permeability, low coercivity and low high-frequency loss. They have excellent comprehensive magnetic properties and are widely used in the field of wireless charging. Traditional nanocrystalline materials are prone to heating during wireless charging. In order to avoid heating of nanocrystals during wireless charging, nanocrystals are usually subjected to magnetic crushing. However, the saturation magnetic induction (B) of nanocrystals after magnetic crushing is low. S ) value and magnetic permeability are low, resulting in low charging efficiency of wireless charging devices that use nanocrystals after crushed magnetic processing 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.

[0006] Summary of the Invention

[0007] 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.

[0008] In a first aspect, a magnetic isolation sheet is provided, which is applied to a coil module in a wireless charging device. 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 undergone magnetic fragmentation treatment.

[0009] It should be understood that the ring may refer to a circular ring or a ring of other shapes, and the embodiments of the present application are not limited to this.

[0010] 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 nanocrystalline that has 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 passes 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 nanocrystal, thereby avoiding eddy current loss caused by magnetic flux change, 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 nanocrystal during wireless charging, the first region in the first nanocrystalline layer is nanocrystal that has not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystalline layer is 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.

[0011] 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 crushing treatment.

[0012] 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 outside of the first area. The embodiments of the present application are not limited to this.

[0013] 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 subjected to magnetic fragmentation treatment, and the material of 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.

[0014] In a possible implementation manner, the first area and the second area are adjacent to each other.

[0015] 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 a non-closed annular area, the second area is on the inner and / or 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 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 adjacent to each other, the edge areas of the first area can be increased with nanocrystals that have been subjected to magnetic fragmentation treatment, and the eddy current loss caused by the change in magnetic flux is reduced by the nanocrystals that have been subjected to magnetic fragmentation treatment on the edge areas of the first area, thereby further avoiding the heating of the magnetic isolation sheet caused by eddy current loss.

[0016] In a possible implementation, the first region includes at least one first notch, wherein the first notch passes through the inner diameter and the outer diameter of the annular shape of the first region.

[0017] It should be understood that when using a magnetic shielding sheet on a larger electronic device, such as a mobile phone, the size of the magnetic shielding sheet used is also larger due to the high battery capacity of the mobile phone. The larger the magnetic shielding sheet, the greater the eddy current loss.

[0018] 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. When the size of the magnetic isolation sheet is greater than a preset threshold, the first area includes at least one first gap, wherein the first gap 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 inclusion of at least one first gap on the first area is equivalent to the presence of two or more gaps on an annular area. The above two or more gaps are respectively the gaps that make the annular area non-closed, and the at least one first gap on the first area. In this way, the magnetic field perpendicular to the plane where the receiving coil is located between the wireless charging transmitting device and the wireless charging receiving device can be released through the gap on the first area to reduce the eddy current loss on the magnetic isolation plate, thereby avoiding the eddy current loss caused by the large size of the magnetic isolation plate, and further avoiding the heating of the magnetic isolation plate caused by the large eddy current loss.

[0019] In a possible implementation, the first nanocrystal layer further includes a third region concentrically arranged with the first region, wherein the third region is in the shape of a non-closed ring and is made of nanocrystals that have not undergone magnetic fragmentation treatment.

[0020] It should be understood that the first area and the third area are two concentrically arranged areas, wherein the first area can be inside the third area or outside the third area, which is not limited in the present embodiment.

[0021] 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, and a third region arranged concentrically with the first region, and the shape of the third region is also a non-closed ring. Among them, the material of the first region and the third region is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the shapes of the first region and the third region are non-closed rings, that is, there is a gap passing through the first region in the first region and the third 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 wireless charging. At the same time, when the first nanocrystalline layer is used to avoid the heating of the nanocrystals during wireless charging, 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, which will not cause the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied to 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.

[0022] 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 undergone magnetic fragmentation treatment.

[0023] 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.

[0024] 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, the first nanocrystalline layer includes a first region in the shape of a non-closed ring, and a fourth region arranged concentrically with the first region, 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, which is equivalent to the first region being outside the fourth region, and the materials of the first region and the fourth region are nanocrystalline that have not been subjected to magnetic fragmentation treatment. Since the shape of the first region is a non-closed ring and the first region is outside the fourth region, it is equivalent to having a gap on the outside of the first nanocrystalline layer. The gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystal, thereby avoiding the eddy current loss caused by the change of magnetic flux, 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 region and the fourth region in the first nanocrystalline layer are both 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.

[0025] In a possible implementation, the magnetic isolation sheet further includes a second nanocrystalline layer, and the material of the second nanocrystalline layer is nanocrystalline that has undergone magnetic fragmentation treatment.

[0026] 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.

[0027] In a possible implementation, the projection of the first nanocrystal layer overlaps with the projection of the second nanocrystal layer.

[0028] In a possible implementation, 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.

[0029] In the second aspect, a magnetic isolation sheet is provided, which 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 larger than the outer diameter of the second ring, and the first region in the first nanocrystalline layer is nanocrystals that have not undergone magnetic fragmentation treatment.

[0030] 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 rings include a first ring and a second ring, and the inner diameter of the first ring is larger than the outer diameter of the second ring, that is, there is a gap between the first ring and the second ring 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 loss 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 a nanocrystal that has 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, which will not cause the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied to 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.

[0031] 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.

[0032] In a possible implementation manner, the first area and the second area are adjacent to each other.

[0033] In a possible implementation, the first nanocrystal layer further includes a third region concentrically arranged with the first region, wherein the third region is in the shape of a non-closed ring and is made of nanocrystals that have not undergone magnetic fragmentation treatment.

[0034] 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 undergone magnetic fragmentation treatment.

[0035] 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 fracturing treatment.

[0036] In a possible implementation, the projection of the first nanocrystal layer overlaps with the projection of the second nanocrystal layer.

[0037] In a possible implementation, 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.

[0038] In a third aspect, a coil module is provided. The coil module is applied to an electronic device used for wireless charging. The electronic device includes a magnetic isolation sheet and an induction coil as described in any one of the first aspect or the second aspect.

[0039] 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, and 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 passes 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 loss 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 a nanocrystal that has not been subjected to magnetic fragmentation treatment, so that the saturation magnetic induction intensity B of the first nanocrystal layer is S The value and magnetic permeability will not be reduced, which will not cause the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied to 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.

[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 smaller than the distance between the second nanocrystalline layer and the induction coil.

[0041] 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.

[0042] The coil module provided in the embodiment of the present application includes a magnetic isolation sheet and an induction coil, and the magnetic isolation sheet includes a first nanocrystalline layer and a second nanocrystalline layer, wherein the second nanocrystalline layer is a 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. In this way, 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 thus 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.

[0043] 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.

[0044] The coil module provided in the embodiments of the present application includes a magnetic isolation sheet and an induction coil. 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 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, reducing the thickness of the magnetic isolation sheet, thereby reducing the thickness of the coil module obtained by combining the magnetic isolation sheet and the induction coil, and saving space in the wireless charging device.

[0045] In a possible implementation, the projection of the induction coil overlaps with the projection of the first area on the magnetic isolation sheet.

[0046] 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 loss caused by magnetic flux changes in the magnetic field, and further avoiding heating of the magnetic isolation sheet due to eddy current loss, thereby improving the efficiency of the wireless charging device.

[0047] In a possible implementation, the size of the induction coil is the same as the size of the first area on the magnetic isolation sheet.

[0048] 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 including a first nanocrystal layer, and the first nanocrystal layer including a first region, wherein the first region is a non-closed annular region, and the first region in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the projection of the first region overlaps with the projection of the induction coil, and the size of the induction coil is the same as the size of the first region on the magnetic isolation sheet, the magnetic field generated by the induction coil during operation can be accurately absorbed by the nanocrystals that have not been subjected to magnetic fragmentation treatment on the first nanocrystal layer, thereby avoiding the need to arrange larger nanocrystals that have not been subjected to magnetic fragmentation treatment under the induction coil to absorb the magnetic field generated by the induction coil during operation, thereby avoiding the magnetic isolation sheet being too large. 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 that have not been subjected to magnetic fragmentation treatment in the first region. That is, while avoiding heating of the magnetic isolation sheet due to 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.

[0049] 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 undergone magnetic fragmentation treatment.

[0050] In a possible implementation manner, the first region and the second region in the magnetic isolation plate are adjacent to each other.

[0051] In a possible implementation, the magnetic isolation sheet further includes a second nanocrystalline layer, and the material of the second nanocrystalline layer is nanocrystalline that has undergone magnetic fragmentation treatment.

[0052] In a possible implementation, a projection of the first nanocrystalline layer and a projection of the second nanocrystalline layer in the magnetic isolation sheet overlap.

[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 smaller than the distance between the second nanocrystalline layer and the induction coil.

[0054] 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.

[0055] In one possible implementation, the induction coil is arranged on one side of the magnetic isolation plate, 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 a 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.

[0056] In a fourth aspect, an electronic device is provided, which includes the coil module as shown in the third aspect.

[0057] In a possible implementation, the electronic device is a wireless charging transmitter device.

[0058] Exemplarily, the electronic device is a charging pad.

[0059] In a possible implementation, the electronic device is a wireless charging receiving device.

[0060] Exemplarily, the electronic device is a smart watch.

[0061] Exemplarily, the electronic device is a mobile phone.

[0062] The embodiments of the present application provide a magnetic isolation sheet, a coil module, and an electronic device, wherein the magnetic isolation sheet is applied to a coil module in a 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 passes 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 loss caused by magnetic flux change, 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 wireless charging, 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, which will not lead to a decrease in the charging efficiency of the wireless charging device used by the magnetic isolation sheet. 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] FIG1 is a schematic diagram of a power transmission coil and a power receiving coil in a wireless charging device;

[0064] FIG2 is a schematic diagram of a nanocrystal that has undergone magnetic crushing treatment;

[0065] FIG3 is a schematic diagram of the shape of small fragments in a nanocrystal subjected to magnetic crushing;

[0066] FIG4 is a schematic diagram of an application scenario provided in an embodiment of the present application;

[0067] FIG5 is a schematic structural diagram of a magnetic isolation sheet provided in an embodiment of the present application;

[0068] FIG6 is a schematic diagram of the shape of a first area on a magnetic isolation sheet provided in an embodiment of the present application;

[0069] FIG7 is a schematic diagram of a nanocrystalline layer on a magnetic isolation sheet provided in an embodiment of the present application;

[0070] FIG8 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;

[0071] FIG9 is a schematic diagram of the magnetic field distribution of the magnetic isolation sheet provided in an embodiment of the present application;

[0072] FIG10 is a schematic structural diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0073] FIG11 is a schematic diagram of the positional relationship between the first area and the second area in an embodiment of the present application;

[0074] FIG12 is a schematic structural diagram of the first nanocrystalline layer in an embodiment of the present application;

[0075] FIG13 is a schematic structural diagram of the first nanocrystalline layer in an embodiment of the present application;

[0076] FIG14 is a schematic structural diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0077] FIG15 is a schematic structural diagram of the first region and the third region provided in an embodiment of the present application;

[0078] FIG16 is a schematic structural diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0079] FIG17 is a schematic structural diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0080] FIG18 is a schematic diagram of the first notch in an embodiment of the present application;

[0081] FIG19 is a schematic diagram of the first notch in an embodiment of the present application;

[0082] FIG20 is a schematic diagram of the magnetic field distribution of the magnetic isolation sheet provided in an embodiment of the present application;

[0083] FIG21 is a schematic structural diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0084] FIG22 is a schematic diagram showing the positional relationship between the first nanocrystalline layer and the second nanocrystalline layer provided in an embodiment of the present application;

[0085] FIG23 is a schematic structural diagram of another magnetic isolation sheet provided in an embodiment of the present application;

[0086] FIG24 is a schematic diagram showing the positional relationship between the first nanocrystalline layer and the second nanocrystalline layer provided in an embodiment of the present application;

[0087] FIG25 is a schematic diagram of an electronic device provided in the present application. DETAILED DESCRIPTION

[0088] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying 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 merely a description of the association relationship of associated objects, indicating that three relationships can exist, 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.

[0089] In the following, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," or "third" may explicitly or implicitly include one or more of the features.

[0090] 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.

[0091] 1. Wireless charging

[0092] Wireless charging refers to the principle of near-field induction of a magnetic field by a wireless charging transmitter to transfer energy to a 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, completing the charging of the wireless charging receiver. For example, as shown in FIG1 , the transmitting coil 10 in the wireless charging transmitter (not shown) transfers energy to the receiving coil 20 in the wireless charging receiver (not shown) through near-field induction of a magnetic field. The wireless charging receiver (not shown) then converts the energy induced in the receiving coil 20 into electrical energy and stores it in a battery (not shown), thereby achieving wireless charging. Electronic devices using wireless charging have no exposed conductive interfaces, which not only eliminates the need for messy transmission lines between devices but is also safer.

[0093] 2. Eddy current loss

[0094] When a conductor moves in a nonuniform magnetic field or is exposed to a time-varying magnetic field, the induced current within the conductor causes energy loss known as eddy current loss. The closed loops of current lines formed within the conductor are called eddy currents (also known as Foucault currents). Nanocrystals have very high electrical conductivity, at 8e5s / m. This high conductivity can lead to significant eddy current losses when used as magnetic shields in wireless charging devices, causing the nanocrystals to heat up during the wireless charging process.

[0095] 3. Magnetic fragmentation

[0096] To prevent heating of the nanocrystals during wireless charging, they are typically broken into multiple small fragments with a diameter of approximately 1 mm. For example, the fragmentation of the nanocrystals into multiple small fragments can be shown in FIG2 , which includes multiple small fragments that are evenly arranged. The process of breaking the nanocrystals into multiple small fragments is called crushing.

[0097] The shapes of the broken pieces may include the following shapes.

[0098] For example, as shown in FIG3( a ), the shape of the small fragments in the broken magnetic nanocrystals is a triangle.

[0099] For example, as shown in FIG3( b ), the small fragments in the broken magnetic nanocrystals are in the shape of quadrilaterals.

[0100] For example, as shown in FIG3( c ), the shape of the small fragments in the broken magnetic nanocrystals is hexagonal.

[0101] For example, as shown in FIG3( d ), the shape of the small fragments in the broken magnetic nanocrystals is octagonal.

[0102] It should be understood that the above content and drawings are merely examples of the shape and arrangement of the fragmented small pieces, and do not limit the shape and arrangement of the fragmented small pieces of the present application.

[0103] 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.

[0104] 4. Wireless charging efficiency

[0105] Taking the commonly used transmitter capacitor coil series (SS) model as an example, the wireless charging efficiency can be calculated using formula (1), where the SS model refers to the compensation model of the coil leakage inductance in the circuit.

[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. M can be calculated using formula (2).

[0107] Where K represents the coupling coefficient, L tx Indicates the self-inductance of the generating coil in the power generation equipment, L rx Indicates the self-inductance of the charging coil in the device to be charged.

[0108] 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.

[0109] 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 unbreakable 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, higher electrical conductivity will produce higher eddy current losses, causing the nanocrystals to heat up during wireless charging. In order to avoid the heating of nanocrystalline materials during wireless charging, the nanocrystalline materials are usually subjected to magnetic fragmentation, 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, the eddy current losses on them are greatly reduced, effectively avoiding the problem of heating of nanocrystalline materials during wireless charging. However, the saturation magnetic induction intensity B of the nanocrystalline material after magnetic fragmentation is S The value and magnetic permeability are low, resulting in low charging efficiency of wireless charging devices that use nanocrystals after crushing magnetic treatment as magnetic isolation sheets.

[0110] 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 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, 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 magnetic flux changes and avoiding the heating problem generated by the nanocrystals during the wireless charging process. In addition, since the first region in the first nanocrystalline 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 is S The value and magnetic permeability are high, so that the charging efficiency of the wireless charging device used by the magnetic isolation sheet is high. 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.

[0111] The application scenarios provided by the embodiments of the present application are described below with reference to the accompanying drawings.

[0112] 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 transmitter device or a wireless charging receiver device, and the embodiment of the present application does not limit this.

[0113] For example, as shown in FIG4(a), in a wireless charging system consisting of an active pen 10A and a tablet computer 10B, the tablet computer 10B acts as a wireless charging transmitter, wirelessly charging the active pen 10A, which is a wireless charging receiver. The magnetic isolation sheet provided in this embodiment of the present application can be used in both the active pen 10A and the tablet computer 10B, and this embodiment of the present application does not limit this.

[0114] For example, as shown in (b) of FIG4 , in a wireless charging system composed of a smart bracelet 20A and a 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 to the wireless charging plate 20B, and the embodiment of the present application does not limit this. Among them, as shown in (b) of FIG4 , the display screen of the smart bracelet 20A can be circular or rectangular, and the embodiment of the present application does not limit this.

[0115] For example, as shown in FIG4(c), in a wireless charging system consisting of a mobile phone 30A and a wireless charging pad 30B, the wireless charging pad 30B acts as a wireless charging transmitter device, wirelessly charging the wireless charging receiver device, the mobile phone 30A. This embodiment of the present application is not limited to this. The magnetic isolation sheet provided in the embodiment of the present application can be applied to the mobile phone 30A or the wireless charging pad 30B.

[0116] 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 do not limit this.

[0117] For example, as shown in FIG4( a ), 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.

[0118] Exemplarily, as shown in (b) of FIG4 , 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.

[0119] For example, as shown in (c) of FIG4 , the wireless charging pad 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 the mobile phone 30A.

[0120] It should be understood that the above is an example of an application scenario and does not limit the application scenario of this application.

[0121] The magnetic isolation sheet provided in the embodiment of the present application is described in detail below with reference to Figures 5 to 24.

[0122] FIG5 is a schematic structural diagram of a magnetic isolation sheet provided in an embodiment of the present application, wherein FIG5(a) is a main view of the magnetic isolation sheet, FIG5(b) is a top view of the first nanocrystalline layer 111, and FIG5(c) is a cross-sectional view of the magnetic isolation sheet. The magnetic isolation sheet is applied to a coil module in a wireless charging device, and the magnetic isolation sheet includes a first nanocrystalline layer 111. As shown in FIG5(a), 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 a nanocrystalline that has not been subjected to magnetic fragmentation treatment.

[0123] It should be understood that the first nanocrystalline layer 111 includes the first region 1111. In one 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.

[0124] 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, and the present embodiment does not limit this.

[0125] For example, as shown in FIG6( a ), the first region 1111 may be a non-closed triangular ring shape.

[0126] For example, as shown in FIG6( b ), the first region 1111 may be a non-closed hexagonal ring.

[0127] For example, as shown in FIG6( c ), the first region 1111 may be in the shape of a non-closed circular ring.

[0128] 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.

[0129] Optionally, the first area 1111 may also be at least two concentric annular areas, wherein the at least two concentric annular areas include a first annular area and a second annular area, and the inner diameter of the first annular area is greater than the outer diameter of the second annular area.

[0130] 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 embodiments of the present application are not limited to this. Among them, the at least two concentric annular areas include a first annular area and a second annular area. When the at least two concentric annular areas are two concentric annular areas, the first annular area may refer to the outer annular area, and the second annular area 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 may be multiple annular areas on the outer side, and the second annular area may be the inner annular area, or the first annular area may be the outermost annular area, and the second annular area may be multiple annular areas on the inner side. Since the inner diameter of the first annular area is larger than the outer diameter of the second annular area, that is to say, there is an empty annular area between the first annular area and the second annular area.

[0131] For example, as shown in (d) of FIG6 , the first region 1111 may be two concentric annular regions, including a first annular region 1111A and a second annular region 1111B, and an empty annular region 1111C exists between the first annular region 1111A and the second annular region 1111B.

[0132] For example, as shown in (e) in FIG6 , the first region 1111 may be three concentric annular regions, including two first annular regions 1111A and one second annular region 1111B, and two empty annular regions 1111C exist between the first annular region 1111A and the second annular region 1111B.

[0133] It should be understood that the at least two concentric annular regions may also refer to annular shapes of other shapes, such as a triangular annular shape or a hexagonal annular shape.

[0134] For example, as shown in FIG6(f), 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 larger than the outer diameter of the second ring 1111B.

[0135] For example, as shown in FIG6(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 larger than the outer diameter of the second ring 1111B.

[0136] In a possible case, the magnetic isolation sheet 110 may include multiple layers of nanocrystals. In the case that 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 .

[0137] 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 .

[0138] For example, as shown in FIG5 ( a ), the magnetic isolation sheet 110 has two layers, including one first nanocrystalline layer 111 .

[0139] For example, as shown in FIG. 7 ( a ), the magnetic isolation sheet 110 has three layers, including one first nanocrystalline layer 111 .

[0140] For example, as shown in FIG. 7 ( b ), the magnetic isolation sheet 110 has three layers, wherein all three layers are first nanocrystalline layers 111 .

[0141] For example, as shown in FIG. 7 ( c ), the number of layers of the magnetic isolation sheet 110 is one. In this case, the magnetic isolation sheet 110 is also the first nanocrystalline layer 111 .

[0142] 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.

[0143] It should be understood that the magnetic isolation sheet is usually arranged below the induction coil. The induction coil can be a power transmission coil in a wireless charging transmitter device, or a power receiving coil in a wireless charging receiver device, and the present application does not limit this.

[0144] The following explanation uses the induction coil as the receiving coil in a wireless charging receiving device as an example. When the wireless charging transmitting device begins to transmit power to the wireless charging receiving device, both the transmitting coil in the wireless charging transmitting device and the receiving coil in the wireless charging receiving device are energized, creating an induced magnetic field between the wireless charging transmitting device and the wireless charging receiving device.

[0145] Exemplarily, a magnetic field distribution diagram of an induced magnetic field between a wireless charging transmitting device and a wireless charging receiving device can be shown in FIG8 . 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 and the plane where the power receiving coil are 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 region in the first nanocrystalline layer can be a non-closed annular region, that is, there is a gap in the first region, and the gap can reduce the magnetic flux change when the magnetic lines of force pass through the nanocrystal, 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. In the magnetic isolation sheet provided in the embodiment of the present application, the first region in the first nanocrystal layer can also be 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, avoid the magnetic flux change caused by the magnetic lines of force at the edge part of the power receiving coil, and thus avoid the eddy current loss caused by the magnetic flux change.

[0146] In this case, there is no need to perform magnetic crushing on the nanocrystals to reduce eddy current loss. Since the nanocrystals in the magnetic isolation sheet have not undergone magnetic crushing, the saturation magnetic induction intensity B of the nanocrystals is SThe value and magnetic permeability will not be reduced, that is, the mutual inductance of the receiving coil of the wireless charging receiving device will not be reduced. Compared with the prior art that uses nanocrystals after crushing magnets as magnetic isolation sheets, the mutual inductance of the receiving coil using the magnetic isolation sheet provided by the embodiment of the present application is higher than the mutual inductance of the 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.

[0147] 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.

[0148] For example, FIG9 is a schematic diagram of the magnetic field intensity distribution on two different magnetic isolation sheets used in smart watches. Among them, FIG9 (a) shows that the multilayer nanocrystals in the magnetic isolation sheet are nanocrystals that have been subjected to magnetic crushing treatment, and FIG9 (b) shows that the magnetic isolation sheet adopts the magnetic isolation sheet provided by the embodiment of the present application. Compared with the magnetic isolation sheet in FIG9 (a), the nanocrystalline layer in the magnetic isolation sheet in FIG9 (b) is a non-closed annular area, while the magnetic isolation sheet in FIG9 (a) is an annular area. It can be seen that the magnetic isolation sheet in FIG9 (a) has multiple eddy current losses on it, while the magnetic isolation sheet in FIG9 (b) has no obvious eddy current losses on it. In other words, the use of the magnetic isolation sheet shown in FIG9 (b) can avoid eddy current losses on the magnetic isolation sheet.

[0149] Furthermore, the nanocrystal loss of the magnetic isolation sheet in Figure 9 (a) is 636.91mW, and the charging efficiency of the wireless charging device using this magnetic isolation sheet is 79.25%. The nanocrystal loss of the magnetic isolation sheet in Figure 9 (b) is 102.78mW, and the charging efficiency of the wireless charging device using this magnetic isolation sheet is 84.05%. It can be seen that the nanocrystal loss on the magnetic isolation sheet shown in Figure 9 (b) is greatly reduced, which significantly improves the efficiency of the wireless charging device.

[0150] 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 passes 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 loss caused by magnetic flux change, 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 wireless charging, 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 is SThe value and magnetic permeability will not be reduced, which will not cause the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied to 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.

[0151] In one possible case, the first region in the first nanocrystal layer also includes a second region around the first region, and the first nanocrystal layer comprises processed nanocrystals in the second region.

[0152] FIG10 is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein FIG10(a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, FIG10(b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application, and FIG10(c) is a side view of the magnetic isolation sheet provided in the embodiment of the present application. As shown in FIG10 , the magnetic isolation sheet 110 includes a first nanocrystalline layer 111. As shown in FIG10(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, and the second region 1112 in the first nanocrystalline layer 111 is nanocrystalline that has been subjected to magnetic fragmentation treatment.

[0153] The second region 1112 is inside the first region 1111, or outside the first region 1111, or both inside and outside the first region 1111. The second region 1112 shown in FIG10 is only an example.

[0154] For example, as shown in FIG. 11( a ), the second region 1112 may be located only inside the first region 1111 .

[0155] For example, as shown in FIG. 11( b ), the second region 1112 may be located only outside the first region 1111 .

[0156] For example, as shown in FIG. 11( c ), the second region 1112 may be located inside and outside the first region 1111 .

[0157] 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 embodiment of the present application does not limit this.

[0158] Exemplarily, as shown in (a) of FIG12 , the first region 1111 is a non-closed circular ring, and the second region 1112 is located inside the first region 1111 , and the second region 1112 is also circular.

[0159] Exemplarily, as shown in FIG12( b ), the first region 1111 is a non-closed circular ring, the second region 1112 is located inside the first region 1111 , and the second region 1112 is a triangle.

[0160] Exemplarily, as shown in (c) of FIG12 , the first region 1111 is a non-closed hexagonal ring, the second region 1112 is located inside the first region 1111 , and the second region 1112 is a circle.

[0161] Exemplarily, as shown in (d) of FIG12 , the first region 1111 is a non-closed hexagonal ring, the second region 1112 is outside the first region 1111 , and the second region 1112 is a circular ring.

[0162] Exemplarily, as shown in (e) of FIG12 , the first region 1111 is a non-closed circular ring, and the second region 1112 is outside the first region 1111 , and the second region 1112 is a circular ring.

[0163] Exemplarily, as shown in (f) of FIG12 , the first region 1111 is a non-closed circular ring, the second region 1112 is outside the first region 1111 , and the second region 1112 is a hexagonal ring.

[0164] For example, as shown in (g) in Figure 12, 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 inside of the first area 1111, the second area 1112 is circular, and on the outside of the first area, the second area 1112 is a circular ring.

[0165] Exemplarily, as shown in (h) in FIG12 , the first region 1111 is a non-closed hexagonal ring, 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 a circular ring.

[0166] Exemplarily, as shown in (i) in Figure 12, the first area 1111 includes a first ring 1111A and a second ring 1111B, and the second area 1112 is on the inner and outer sides of 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.

[0167] It should be understood that at the edge of the magnetic isolation sheet shown in FIG5 , there are magnetic lines of force perpendicular to the plane where the power receiving coil is located. As shown in FIG8 , these magnetic lines of force can produce large magnetic flux changes, which can easily generate eddy current losses. Therefore, the first nanocrystalline layer 111 can be further provided with a second region 1112 based on the magnetic isolation sheet shown in FIG5 . The first nanocrystalline layer 111 comprises nanocrystallines that have undergone magnetic fracturing treatment in 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 located at the edge of the first region 1111. Since the first nanocrystalline layer 111 comprises nanocrystallines that have undergone magnetic fracturing treatment in the second region 1112, this is equivalent to adding nanocrystallines that have undergone magnetic fracturing treatment to the edge of the magnetic isolation sheet shown in FIG5 . The newly added nanocrystallines that have undergone magnetic fracturing treatment (equivalent to the second region 1112) can effectively reduce the eddy current losses generated by magnetic flux changes in the edge region, thereby avoiding heating of the magnetic isolation sheet due to large eddy current losses.

[0168] 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 a non-closed annular area, the second area is on the inner and / or outer side of the first 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, which 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.

[0169] Optionally, the second region 1112 and the first region 1111 are adjacent to each other.

[0170] For example, as shown in FIG13 , first region 1111 is an open circular ring, and second region 1112 is located inside and outside first region 1111. Second region 1112 is a circular region inside first region 1111, and a circular region outside first region 1112. Both the circular region inside first region 1111 and the circular region outside first region 1111 are connected to first region 1111. This means that the edges of first region 1111 are all provided with nanocrystals that have undergone crushed magnetization treatment.

[0171] 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 a non-closed annular area, the second area is on the inner and / or 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 edge areas of the first area can be increased with nanocrystals that have been subjected to magnetic fragmentation treatment, and the eddy current loss caused by the change in magnetic flux is reduced by the nanocrystals that have been subjected to magnetic fragmentation treatment on the edge areas of the first area, thereby further avoiding the heating of the magnetic isolation sheet caused by eddy current loss.

[0172] In one possible case, the first nanocrystal layer further includes a third region, and the material of the third region is also untreated nanocrystals.

[0173] FIG14 is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein FIG14(a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, and FIG14(b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application. As shown in FIG14 , 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 both nanocrystalline that have not undergone magnetic fragmentation treatment.

[0174] The third area 1113 may be located inside or outside the first area 1111 , and this is not limited in the embodiment of the present application.

[0175] For example, as shown in FIG. 14( a ) and FIG. 14 ( b ), the third region 1113 may be outside the first region 1111 .

[0176] For example, as shown in FIG. 14( c ) and FIG. 14 ( d ), the third region 1113 may be located inside the first region 1111 .

[0177] Since the third area 1113 is in the shape of a non-closed ring, there is a gap that passes through the inner diameter and outer diameter in the third area 1113. Similarly, the first area 1111 is also in the shape of a non-closed ring, so there is a gap that passes through the inner diameter and outer diameter in the first area 1111.

[0178] The shape of the notch in the first region 1111 and the shape of the notch in the third region 1113 may be the same or different, and this embodiment of the present application does not limit this.

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

[0180] For example, as shown in (a) in Figure 15, 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.

[0181] For example, as shown in (b) in Figure 15, 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.

[0182] 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, and a third region arranged concentrically with the first region, and the shape of the third region is also a non-closed ring. Among them, the material of the first region and the third region is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the shapes of the first region and the third region are non-closed rings, that is, there is a gap in the first region and the third region that passes 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 loss caused by magnetic flux change, 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 wireless charging, the first region and the third region 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, which will not cause the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied to 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.

[0183] In one possible case, the first nanocrystal layer further includes a fourth region, and the material of the fourth region is also untreated nanocrystals.

[0184] FIG16 is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein FIG16(a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, and FIG16(b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application. As shown in FIG16 , 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, and 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. The materials of the first region 1111 and the fourth region 1114 are both nanocrystalline that have not undergone magnetic refraction treatment.

[0185] 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 inside the first region 1111 .

[0186] When the fourth region 1114 is on the inner side of the first region 1111, it is equivalent to having a gap on the outside of the first nanocrystal layer 111 (the first region 1111). The gap on the outside 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.

[0187] 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, the first nanocrystalline layer includes a first region in the shape of a non-closed ring, and a fourth region arranged concentrically with the first region, 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, which is equivalent to the first region being outside the fourth region, and the materials of the first region and the fourth region are nanocrystalline that have not been subjected to magnetic fragmentation treatment. Since the shape of the first region is a non-closed ring and the first region is outside the fourth region, it is equivalent to having a gap on the outside of the first nanocrystalline layer. The gap can avoid the change of magnetic flux when the magnetic lines of force in the magnetic field pass through the nanocrystal, thereby avoiding the eddy current loss caused by the change of magnetic flux, 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 region and the fourth region in the first nanocrystalline layer are both 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, which will not cause the charging efficiency of the wireless charging device to which the magnetic isolation sheet is applied to 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.

[0188] In one possible scenario, 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 generally 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 generated by the eddy current loss on the magnetic isolation sheet. This is explained in detail below through the embodiments shown in Figures 17 to 20.

[0189] FIG17 is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein FIG17(a) is a front view of the magnetic isolation sheet provided in the embodiment of the present application, and FIG17(b) is a top view of the magnetic isolation sheet provided in the embodiment of the present application. As shown in FIG17 , the magnetic isolation sheet comprises at least one layer of nanocrystals 110, and the at least one layer of nanocrystals 110 comprises a first nanocrystal layer 111. As shown in FIG17(b), the first nanocrystal layer comprises a first region 1111 and a second region 1112. The first region 1111 is a non-closed annular region. The first region 1111 comprises at least one first notch 111A. The second region 1112 is located around the first region 1111. The first region 1111 in the first nanocrystal layer 111 is nanocrystal that has not been subjected to magnetic fracturing treatment, and the second region 1112 in the first nanocrystal layer 111 is nanocrystal that has been subjected to magnetic fracturing treatment.

[0190] It should be understood that the first notch 111A refers to a notch that penetrates the inner diameter and the outer diameter of the first region 1111 .

[0191] For example, as shown in (a) of FIG18 , 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.

[0192] For example, as shown in FIG18( b ), the first notch 111A may also be rectangular.

[0193] 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 .

[0194] It should be understood that the number of the first notches 111A can be one or more, and this embodiment of the present application does not limit this.

[0195] For example, as shown in FIG. 19( a ), the number of the first notch 111A is one.

[0196] For example, as shown in FIG19( b ), the number of the first notches 111A is three.

[0197] It should be understood that the first notch 111A can be set at any position in the first area, 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 outer diameter of the first area 1111.

[0198] When the size of the magnetic isolation sheet is large, on the basis of the embodiments shown in Figures 5 to 13, a gap is added on the first area, so that the magnetic field perpendicular to the plane where the receiving coil is located between the wireless charging transmitting device and the wireless charging receiving device can be released through the gap on the first area, so as to reduce the eddy current loss on the magnetic isolation sheet, thereby avoiding the heating of the magnetic isolation sheet due to the large eddy current loss.

[0199] The effect of adding a first gap to the magnetic isolation plate in the first area will be described below with reference to FIG. 20 .

[0200] For example, as shown in FIG20 , three schematic diagrams of magnetic field intensity distribution on magnetic isolation sheets used in smart watches are provided.

[0201] Among them, (a) in Figure 20 is the magnetic field strength distribution diagram of the magnetic isolation plate with one new first gap 111A added to the first area 1111, (b) in Figure 20 is the magnetic field strength distribution diagram of the magnetic isolation plate with two new first gaps 111A added to the first area 1111, and (c) in Figure 20 is the magnetic field strength distribution diagram of the magnetic isolation plate with three new first gaps 111A added to the first area 1111.

[0202] As shown in Figure 20, adding one first notch 111A to the first region 1111 reduces eddy current loss, nanocrystal loss is 99.442 mW, and the efficiency of the wireless charging device is 84.12%. Adding two first notches 111A to the first region 1111 also reduces eddy current loss, nanocrystal loss is 101.87 mW, and the efficiency of the wireless charging device is 84.09%. Adding one first notch 111A to the first region 1111 also reduces eddy current loss, nanocrystal loss is 100.59 mW, and the efficiency of the wireless charging device is 84.09%.

[0203] 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 inside and / or outside 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 fragmentation treatment, and the second area is a nanocrystal that has been subjected to magnetic fragmentation treatment. When the size of the magnetic isolation sheet is greater than a 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 one annular area, and the two or more gaps are respectively a gap that makes the annular area non-closed and at least one first gap on the first area. Exemplarily, when the first area includes one first gap, there are equivalent to two gaps on the first nanocrystal layer, namely a gap that makes the annular area non-closed and one first gap. For example, when the first region includes two first gaps, the first nanocrystalline layer is equivalent to having three gaps: a gap that leaves the annular region open and two first gaps. This allows the magnetic field between the wireless charging transmitter and receiver, perpendicular to the plane of the receiving coil, to be released through the gaps in the first region, thereby reducing eddy current losses in the magnetic isolation sheet, thereby avoiding eddy current losses caused by the large size of the magnetic isolation sheet, and further avoiding heating of the magnetic isolation sheet caused by large eddy current losses.

[0204] The above embodiments focus on the specific conditions of the nanocrystalline layer on the magnetic isolation sheet. Generally, the magnetic isolation sheet can include multiple nanocrystalline layers. The structures of the nanocrystalline layers can be the same or different, and this embodiment of the present application does not limit this. The following embodiments shown in Figures 21 to 24 will further illustrate the specific conditions of the different structures of the nanocrystalline layers.

[0205] Figure 21 is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein (a) in Figure 21 is a main view of the magnetic isolation sheet, and (b) in Figure 21 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. As shown in (b) in Figure 21, the first nanocrystal 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 nanocrystal layer 111 is a nanocrystal that has not been subjected to magnetic fragmentation treatment, the second region 1112 in the first nanocrystal layer 111 is a nanocrystal that has been subjected to magnetic fragmentation treatment, and the second nanocrystal layer 112 is a nanocrystal that has been subjected to magnetic fragmentation treatment.

[0206] 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 embodiments of the present application do not limit this. For example, the magnetic isolation sheet shown in Figure 21 includes three layers of nanocrystals, two of which are first nanocrystal layers 111 and one is a second nanocrystal layer 112. The nanocrystals in each layer can be connected by double-sided tape or bonded by other adhesive materials, and the embodiments of the present application do not limit this. A covering film can be provided above and below the magnetic isolation sheet, respectively.

[0207] 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, which is not limited in the embodiment of the present application.

[0208] Optionally, the projection of the first nanocrystal layer 111 and the projection of the second nanocrystal layer 112 overlap.

[0209] 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 a nanocrystal layer in at least one layer of nanocrystals.

[0210] 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.

[0211] Exemplarily, the magnetic isolation sheet is combined with the power transmission coil to serve as a coil module in a wireless charging transmitter device.

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

[0213] In other words, 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 this embodiment of the present application.

[0214] 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 .

[0215] For example, as shown in FIG22( a ), the magnetic isolation sheet includes three nanocrystal layers, two of which are first nanocrystal layers 111 and one is second nanocrystal layer 112. The magnetic isolation sheet is disposed 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. In other words, the second nanocrystal layer 112 is below the first nanocrystal layer 111.

[0216] 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 .

[0217] For example, as shown in FIG22( b ), the magnetic isolation sheet includes three nanocrystal layers, two of which are first nanocrystal layers 111 and one is second nanocrystal layer 112. The magnetic isolation sheet is disposed 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. In other words, the second nanocrystal layer 112 is above the first nanocrystal layer 111.

[0218] 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 a 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. In this way, 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 thus 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.

[0219] When other nanocrystalline layers are disposed above the first nanocrystalline layer 111, since the first nanocrystalline layer 111 is composed of nanocrystalline particles that have not undergone magnetic fragmentation treatment in the first region 1111, the magnetic isolation plate has a high saturation magnetic induction characteristic in the first region 1111. Therefore, no nanocrystalline layer is required above the first region 1111 to reduce eddy current losses. In other words, the induction coil can be directly placed above the first region 1111. This will be described in detail below using the embodiment shown in FIG. 23.

[0220] Figure 23 is a schematic diagram of a magnetic isolation sheet provided in another embodiment of the present application, wherein (a) in Figure 23 is a main view of the magnetic isolation sheet, and (b) in Figure 23 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. As shown in (a) in Figure 23, the first nanocrystal 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 nanocrystal layer 111 is a nanocrystal that has not been subjected to magnetic fragmentation treatment, and the second region 1112 in the first nanocrystal layer 111 is a nanocrystal that has been subjected to magnetic fragmentation treatment. The third nanocrystalline layer 113 includes a third area 1131 and a second notch 1132. The projection of the second notch 1132 overlaps with the projection of the first area 1111. The third area 1131 refers to the area on the third nanocrystalline layer 113 except the second notch 1132. The third area 1131 in the third nanocrystalline layer 113 is a nanocrystal that has undergone magnetic fragmentation treatment. The distance between the third nanocrystalline layer 113 and the induction coil 20 in the coil module is smaller than the distance between the first nanocrystalline layer 111 and the induction coil 20.

[0221] It should be understood that the magnetic isolation sheet generally includes multiple layers of nanocrystals. The structures of each layer of nanocrystals can be the same or different, and the embodiments of the present application are not limited to this. For example, the magnetic isolation sheet shown in Figure 23 includes three layers of nanocrystals, two of which are the first nanocrystal layer 111 and one is the third nanocrystal layer 113. The layers of nanocrystals can be connected by double-sided tape. A covering film can be provided above and below the magnetic isolation sheet.

[0222] 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.

[0223] Exemplarily, the magnetic isolation sheet is combined with the power transmission coil to serve as a coil module in a wireless charging transmitter device.

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

[0225] That is to say, an induction coil is usually arranged above the magnetic isolation sheet.

[0226] It should be understood that the at least one layer of nanocrystals 110 in the magnetic isolation sheet is typically stacked. In the embodiments of the present application, the at least one layer of nanocrystals 110 includes a first nanocrystal layer 111 and a third nanocrystal layer 113. Typically, the third nanocrystal layer 113 is disposed above the first nanocrystal layer 111. An induction coil is disposed above the magnetic isolation sheet. Since the third nanocrystal layer 113 is disposed above the first nanocrystal layer 111, 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.

[0227] The third nanocrystal layer 113 includes a third region 1131 and a second notch 1132. The projection of the second notch 1132 overlaps the projection of the first region 1111. The third region 1131 refers to the area of ​​the third nanocrystal layer 113 excluding the second notch 1132. The third region 1131 of the third nanocrystal layer 113 is nanocrystal that has undergone magnetic fragmentation treatment.

[0228] It should be understood that to further improve the charging efficiency of the wireless charging device, the first area 1111 is typically positioned 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 the second notch 1132 also being below the induction coil, and the projection of the second notch 1132 also overlaps with the projection of the induction coil. When the projection of the second notch 1132 overlaps with the projection of the induction coil, as shown in FIG23(b), the induction coil can occupy the space where the second notch 1132 is located.

[0229] 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.

[0230] For example, as shown in FIG. 24( a ), the induction coil occupies the entire space where the second notch 1132 is located, so the second notch 1132 is not shown in FIG. 24( a ).

[0231] Exemplarily, as shown in (b) of FIG. 24 , the induction coil occupies part of the space where the second notch 1132 is located. Exemplarily, as shown in (b) of FIG. 24 , the induction coil occupies part of the space where the second notch 1132 is located.

[0232] Among them, (a) in Figure 24 is a cross-sectional view of a coil module provided in an embodiment of the present application, and (a) in Figure 24 is a cross-sectional view of another coil module provided in an embodiment of the present application.

[0233] It should be understood that 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.

[0234] 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 region and a second notch, the projection of the second notch overlaps with the projection of the first region, the third region refers to the region on the third nanocrystalline layer other than the second notch, the third region in the third nanocrystalline layer is a 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 further 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.

[0235] In one embodiment of the present application, a coil module is further provided. The coil module includes the magnetic isolation sheet and the induction coil shown in any one of the embodiments of FIG. 5 to FIG. 24 .

[0236] The coil module provided in the embodiment of the present application has an implementation principle and beneficial effects similar to those of the magnetic isolation sheet shown in any one of the embodiments in Figures 5 to 24, and will not be repeated here.

[0237] In one possible case, the projection of the induction coil overlaps with the projection of the first area on the magnetic isolation sheet.

[0238] 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 loss caused by magnetic flux changes in the magnetic field, and further avoiding heating of the magnetic isolation sheet due to eddy current loss, thereby improving the efficiency of the wireless charging device.

[0239] In a possible case, 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.

[0240] It should be understood that in industrial production, the dimensions of two objects are typically not identical, and tolerances exist between them. Therefore, the fact that the dimensions of the induction coil are identical to the dimensions of the first region on the magnetic shielding sheet may mean that the induction coil is slightly larger than the first region, or slightly smaller than the first region. This is not a limitation in the present embodiment.

[0241] 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, so that the magnetic field generated by the induction coil when it 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.

[0242] 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 including a first nanocrystal layer, and the first nanocrystal layer including a first region, wherein the first region is a non-closed annular region, and the first region in the first nanocrystal layer is nanocrystals that have not been subjected to magnetic fragmentation treatment. Since the projection of the first region overlaps with the projection of the induction coil, and the size of the induction coil is the same as the size of the first region on the magnetic isolation sheet, the magnetic field generated by the induction coil during operation can be accurately absorbed by the nanocrystals that have not been subjected to magnetic fragmentation treatment on the first nanocrystal layer, thereby avoiding the need to arrange larger nanocrystals that have not been subjected to magnetic fragmentation treatment under the induction coil to absorb the magnetic field generated by the induction coil during operation, thereby avoiding the magnetic isolation sheet being too large. 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 that have not been subjected to magnetic fragmentation treatment in the first region. That is, while avoiding heating of the magnetic isolation sheet due to 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.

[0243] 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 referred to as a terminal, user equipment (UE), mobile station (MS), 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 (industrial control), a wireless terminal in self-driving (self-driving), a wireless terminal in remote medical surgery (remote medical surgery), a wireless terminal in smart grid (smart grid), a wireless terminal in transportation safety (transportation safety), a wireless terminal in smart city (smart city), a wireless terminal in smart home (smart home), etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the terminal device.

[0244] Optionally, the electronic device may be a wireless charging transmitter device.

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

[0246] It should be understood that the implementation principle and beneficial effects of the above-mentioned electronic device are similar to those of the above-mentioned coil module and the magnetic isolation sheet described in any one of Figures 5 to 24, and will not be repeated here.

[0247] 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 this application.

[0248] 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.

[0249] 25 shows a schematic structural diagram of an 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 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.

[0250] It should be understood that the structures illustrated in the embodiments of the present application do 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, or may combine or separate certain components, or arrange the components differently. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

[0251] 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 processing unit (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). The different processing units may be independent devices or integrated into one or more processors.

[0252] The charging management module 140 is configured 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 charging the battery 142, the charging management module 140 may also provide power to the electronic device 100 via the power management module 141.

[0253] 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 provides power to the processor 110, the internal memory 121, the external memory, the display 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 count, and battery health status (leakage, impedance). 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.

[0254] 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.

[0255] Those skilled in the art will 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.

[0256] In the several embodiments provided in this 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 illustrative; for example, the division of the units is merely 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 an indirect coupling or communication connection of some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0257] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0258] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A magnetic isolation sheet, used in a coil module of a wireless charging device, characterized in that: The magnetic isolation sheet includes a first nanocrystalline layer, which includes a first region in a non-closed ring shape, wherein the material of the first region is nanocrystalline that has not been subjected to magnetic fragmentation treatment.

2. The magnetic isolation sheet according to claim 1, wherein: The first nanocrystal layer further includes a second region, which is arranged around the first region. The material of the second region is nanocrystals that have undergone magnetic fracturing treatment.

3. The magnetic isolation sheet according to claim 2, characterized in that: The first region and the second region are adjacent to each other.

4. The magnetic isolation sheet according to any one of claims 1 to 3, characterized in that: The first region further includes a first notch, wherein the first notch extends through the inner diameter and the outer diameter of the annular shape of the first region.

5. The magnetic isolation sheet according to any one of claims 1 to 4, characterized in that: The first nanocrystal layer further includes a third region concentrically arranged with the first region, wherein the third region is in the shape of a non-closed ring and is made of nanocrystals that have not undergone magnetic fracturing treatment.

6. The magnetic isolation sheet according to any one of claims 1 to 4, characterized in that: 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 fragmentation treatment.

7. The magnetic isolation sheet according to any one of claims 1 to 4, characterized in that: The magnetic isolation sheet further includes a second nanocrystalline layer, and the material of the second nanocrystalline layer is nanocrystalline that has undergone magnetic fragmentation treatment.

8. The magnetic isolation sheet according to claim 7, characterized in that: The projection of the first nanocrystal layer overlaps with the projection of the second nanocrystal layer.

9. The magnetic isolation sheet according to claim 7 or 8, characterized in that: 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.

10. A coil module used in electronic equipment, the coil module comprising the magnetic isolation sheet and an induction coil according to any one of claims 1 to 9.

11. The coil module according to claim 10, characterized in that: The induction coil is arranged 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 in the magnetic isolation sheet and the induction coil.

12. The coil module according to claim 10, characterized in that: The induction coil is arranged on one side of the magnetic isolation sheet, and the distance between the second nanocrystalline layer in the magnetic isolation sheet and the induction coil is smaller than the distance between the first nanocrystalline layer and the induction coil.

13. The coil module according to any one of claims 10 to 12, characterized in that: A projection of the induction coil overlaps with a projection of a first region in the first nanocrystalline layer.

14. An electronic device, characterized in that: The electronic device comprises the coil module according to any one of claims 10 to 13.

15. The electronic device according to claim 14, characterized in that The electronic device is a wireless charging transmitter device.

16. The electronic device according to claim 14, characterized in that The electronic device is a wireless charging receiving end device.

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