An ultrathin nanocrystalline soft magnetic material composite structure for wireless charging

Abstract

This invention discloses an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, belonging to the field of wireless charging technology. It includes, from bottom to top, a release film, a double-sided adhesive layer, a nanocrystalline layer, a single-sided adhesive layer, and a protective film. The edges of the double-sided and single-sided adhesive layers are larger than the nanocrystalline layer, serving as an edge-sealing film for the nanocrystalline layer. The nanocrystalline layer is fragmented into fragmented nanocrystalline particles, which are then encapsulated between the double-sided and single-sided adhesive layers. There are two nanocrystalline layers, bonded together with 3μm adhesive tape for ultrathin adhesion. This invention features an ultrathin design with a total thickness of 0.096mm ± 0.007mm, resulting in a lightweight and thin design suitable for mobile phones and other devices. The fragmentation process of the nanocrystalline layer suppresses eddy current losses, enhances magnetic performance, balances permeability and magnetic loss, and improves charging efficiency. The single-sided and double-sided adhesive layers work together to prevent interlayer delamination, ensuring high stability and uniform magnetic field distribution.

Description

Technical Field

[0001] This utility model relates to the field of wireless charging technology, specifically to an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging. Background Technology

[0002] In wireless charging modules for mobile phones and other electronic devices, soft magnetic materials must simultaneously meet the requirements of high permeability, low magnetic loss, and ultra-thinness to achieve efficient energy transfer within a compact space. Traditional nanocrystalline soft magnetic materials typically employ single-layer structures or simple lamination processes, which present the following problems:

[0003] The contradiction between magnetic permeability and magnetic loss: Nanocrystalline materials need to improve their magnetic permeability through annealing, but high-temperature treatment can easily lead to material embrittlement and increase magnetic loss;

[0004] Structural redundancy: Traditional multilayer stacking designs introduce excessively thick adhesive layers (typically >10μm), affecting the overall thinness and lightness;

[0005] The processing technology is complex: In the existing technology, the bonding of nanocrystals and adhesive layers is prone to bubbles or misalignment, resulting in uneven magnetic field distribution and reduced charging efficiency. Utility Model Content

[0006] The purpose of this invention is to provide an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, which solves the problem of incompatibility between magnetic properties and thinness in traditional technologies through multi-layer material synergistic design and fragmentation process.

[0007] Technical Solution: This utility model provides an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, comprising, from bottom to top, a release film, a double-sided adhesive layer, a nanocrystalline layer, a single-sided adhesive layer, and a protective film. The edges of the double-sided adhesive layer and the single-sided adhesive layer are larger than the nanocrystalline layer, serving as the edge-sealing film for the nanocrystalline layer. The nanocrystalline layer is fragmented into fragmented nanocrystalline particles, which are then wrapped between the double-sided adhesive layer and the single-sided adhesive layer. Furthermore, there are two nanocrystalline layers, which are bonded together with 3μm adhesive tape for ultrathin adhesion.

[0008] Furthermore, in the aforementioned ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, the release film has a thickness of 0.05 mm, which isolates the double-sided adhesive from the outside world, thus preventing products from sticking together.

[0009] Furthermore, in the aforementioned ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, the double-sided adhesive layer is a transparent double-sided adhesive layer with a thickness of 0.007 mm.

[0010] Furthermore, in the aforementioned ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, the nanocrystalline layer undergoes a gradient heat treatment process, annealing at 560-590℃ to form directional magnetic domains. The nanocrystalline layer has a thickness of 15μm and is fragmented into particles of 2-10μm. The particles are not visible in appearance, but when the nanocrystalline layer is bent at a certain angle, the particles become clearly visible.

[0011] Furthermore, in the aforementioned ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, the single-sided adhesive layer has a thickness of 0.005 mm, and the nanocrystalline layer between the edges of the single-sided adhesive layer and the double-sided adhesive layer exceeds 0.5 mm. The single-sided adhesive layer and the double-sided adhesive layer work together as an edge-sealing film, and the edge portion is bonded to wrap the fragmented nanocrystalline layer inside the single-sided adhesive layer and the double-sided adhesive layer.

[0012] Furthermore, in the aforementioned ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, the protective film is a mesh protective film with a thickness of 0.075 mm. As a surface protective layer, the mesh can be used for venting.

[0013] Furthermore, in the aforementioned ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, the release film, double-sided adhesive layer, nanocrystalline layer, single-sided adhesive layer, and protective film are die-cut before bonding, and are die-cut into the required shapes according to actual conditions, with a total thickness of 0.096mm±0.007mm.

[0014] As can be seen from the above technical solution, the present invention has the following beneficial effects: The ultra-thin nanocrystalline soft magnetic material composite structure for wireless charging described in the present invention features a multi-layer material composite ultra-thin design with a total thickness of 0.096mm ± 0.007mm. The nanocrystalline layer is bonded with 3μm tape to achieve ultra-thin adhesion, making the overall structure lightweight and suitable for mobile phones and other devices. The nanocrystalline layer is fragmented, and the fragmented nanocrystalline particles form local low permeability regions, which suppress eddy current loss, improve magnetic performance, balance permeability and magnetic loss, and improve charging efficiency. The single-sided adhesive layer and the double-sided adhesive layer work together to avoid interlayer delamination, resulting in high stability and ensuring uniform magnetic field distribution. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging according to this utility model.

[0016] Figure 2 This is a schematic diagram of the nanocrystalline layer of this utility model.

[0017] In the diagram: 1. Release film; 2. Double-sided adhesive layer; 3. Nanocrystalline layer; 4. Single-sided adhesive layer; 5. Protective film. Detailed Implementation

[0018] Example 1

[0019] like Figure 1-2 The diagram shows an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging, comprising, from bottom to top, a release film 1, a double-sided adhesive layer 2, a nanocrystalline layer 3, a single-sided adhesive layer 4, and a protective film 5. The edges of the double-sided adhesive layer 2 and the single-sided adhesive layer 4 are larger than those of the nanocrystalline layer 3, serving as the edge-sealing film for the nanocrystalline layer 3. The nanocrystalline layer 3 is fragmented into fragmented nanocrystalline particles, which are then encapsulated between the double-sided adhesive layer 2 and the single-sided adhesive layer 4. The nanocrystalline layer 3 has two layers, and the nanocrystalline layers 3 are bonded together with a 3μm adhesive tape for ultrathin adhesion.

[0020] like Figure 2 The diagram illustrates an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging. The nanocrystalline layer 3 undergoes a gradient heat treatment process, annealing at 560-590℃ to form oriented magnetic domains. The nanocrystalline layer 3 has a thickness of 15μm and is fragmented into particles of 2-10μm. While the particles are not immediately visible, they become clearly visible when the nanocrystalline layer 3 is bent at a certain angle. After bonding, the nanocrystalline layer is completely broken down, reducing the permeability to 1500 and simultaneously reducing the material's magnetic loss. The fragmented nanocrystalline particles form localized low permeability regions, suppressing eddy current losses, improving magnetic performance, balancing permeability and magnetic loss, and enhancing charging efficiency. Furthermore, the fragmented nanocrystalline particles can disperse stress. The material can be bent at 10... 4 The permeability decay is less than 5%.

[0021] Example 2

[0022] Based on Example 1, in this example, as... Figure 1 The diagram illustrates an ultrathin nanocrystalline soft magnetic material composite structure for wireless charging. The double-sided adhesive layer 2 is a transparent double-sided adhesive layer with a thickness of 0.007 mm; the single-sided adhesive layer 4 has a thickness of 0.005 mm. The edges of the single-sided adhesive layer 4 and the double-sided adhesive layer 2 extend 0.5 mm beyond the nanocrystalline layer 3 between them. The single-sided adhesive layer 4 and the double-sided adhesive layer 2 work together as an edge-sealing film, and the edge portion is bonded to encapsulate the fragmented nanocrystalline layer 3 inside the single-sided adhesive layer 4 and the double-sided adhesive layer 2, thereby reducing the risk of short circuits caused by nanocrystalline debris inside electronic products.

[0023] In this embodiment, the release film 1 has a thickness of 0.05 mm, which isolates the double-sided adhesive 2 from the outside world, thus preventing the products from sticking together.

[0024] In this embodiment, the protective film 5 is a mesh protective film with a thickness of 0.075mm. As a surface protective layer, the mesh facilitates air venting, and no air bubbles are generated between the protective film 5 and the product.

[0025] In this embodiment, the release film 1, double-sided adhesive layer 2, nanocrystalline layer 3, single-sided adhesive layer 4, and protective film 5 are die-cut before bonding, and are die-cut into the required shapes according to the actual situation, with a total thickness of 0.096mm±0.007mm.

[0026] It should be noted that the above description is merely a technical solution of the utility model and not a limitation. Although the present utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of the utility model without departing from the scope of the present utility model, and all such modifications and substitutions should be covered within the scope of the claims of the present utility model.

Claims

1. A composite structure of ultrathin nanocrystalline soft magnetic material for wireless charging, characterized in that: The package includes, from bottom to top, a release film (1), a double-sided adhesive layer (2), a nanocrystalline layer (3), a single-sided adhesive layer (4), and a protective film (5). The edges of the double-sided adhesive layer (2) and the single-sided adhesive layer (4) are larger than those of the nanocrystalline layer (3), serving as the edge-sealing film for the nanocrystalline layer (3). The nanocrystalline layer (3) is fragmented into fragmented nanocrystalline particles and is wrapped between the double-sided adhesive layer (2) and the single-sided adhesive layer (4). The nanocrystalline layer (3) has two layers, and the nanocrystalline layers (3) are bonded together with a 3μm tape to achieve ultra-thin adhesion.

2. The ultrathin nanocrystalline soft magnetic material composite structure for wireless charging according to claim 1, characterized in that: The release film (1) is 0.05 mm thick and isolates the double-sided adhesive layer (2) from the outside world, so that the products will not stick together.

3. The ultrathin nanocrystalline soft magnetic material composite structure for wireless charging according to claim 1, characterized in that: The double-sided adhesive layer (2) is a transparent double-sided adhesive layer with a thickness of 0.007 mm.

4. The ultrathin nanocrystalline soft magnetic material composite structure for wireless charging according to claim 1, characterized in that: The nanocrystalline layer (3) is subjected to a gradient heat treatment process and annealed at 560-590℃ to form directional magnetic domains. The nanocrystalline layer (3) has a thickness of 15μm. After fragmentation, it is divided into particles of 2-10μm. The particles are not visible in appearance. However, when the nanocrystalline layer (3) is bent at a certain angle, the particles can be seen.

5. The ultrathin nanocrystalline soft magnetic material composite structure for wireless charging according to claim 1, characterized in that: The thickness of the single-sided adhesive layer (4) is 0.005 mm. The edge of the single-sided adhesive layer (4) and the double-sided adhesive layer (2) exceeds the nanocrystalline layer (3) by 0.5 mm. The single-sided adhesive layer (4) and the double-sided adhesive layer (2) work together as an edge-sealing film. The edge part is bonded to wrap the fragmented nanocrystalline layer (3) inside the single-sided adhesive layer (4) and the double-sided adhesive layer (2).

6. The ultrathin nanocrystalline soft magnetic material composite structure for wireless charging according to claim 1, characterized in that: The protective film (5) is a mesh protective film with a thickness of 0.075 mm. As a surface protective layer, the mesh can be used for exhaust.

7. The ultrathin nanocrystalline soft magnetic material composite structure for wireless charging according to claim 1, characterized in that: The release film (1), double-sided adhesive layer (2), nanocrystalline layer (3), single-sided adhesive layer (4), and protective film (5) are die-cut before bonding, and the total thickness is 0.096mm ± 0.007mm.

Images