Preparation method of wireless charging shielding sheet and shielding sheet

Abstract

The invention discloses a preparation method of a wireless charging shielding sheet and the shielding sheet, and belongs to the technical field of electromagnetic shielding, and the method comprises the steps: S1, carrying out the heat treatment of a soft magnetic material strip, and forming a substrate; S2, forming at least one shielding layer unit; S3, superposing at least one shielding layer unit to form a shielding sheet structure; S4, pressurizing and crushing the shielding sheet structure through a roller with a preset pattern arranged on the surface; and S5, enabling the upper and lowersurfaces of the shielding sheet structure to be attached to a heat dissipation film, and forming a wireless charging shielding sheet, wherein the shielding sheet comprises a shielding sheet structureand a heat dissipation film, the shielding sheet structure comprises at least one shielding layer unit, and each shielding layer unit comprises a base material and colloid. The technical scheme has the beneficial effects that the shielding sheet obtained after graphical processing is uniform in shape and grain size, good in gap size consistency, good in colloid filling property, large in impedance on the surface of the shielding sheet, small in eddy-current loss, stable in dielectric property and easy to produce in batches.

Description

technical field [0001] The invention relates to the technical field of wireless charging and electromagnetic shielding, in particular to a preparation method of a wireless charging shielding sheet and the shielding sheet. Background technique [0002] Today, with the rapid development of science and technology, wireless charging technology has shown broad development prospects. This technology frees chargers from the limitations of lines, realizes the complete separation of electrical appliances and power supplies, and shows the traditional charging in terms of safety and flexibility. However, because wireless charging technology uses the working principle of near-field induction, the farther the wireless transmission distance is, the higher the energy consumption of the device is. To achieve long-distance and high-power wireless electromagnetic conversion, the energy consumption of the device will also increase. It will be higher, so realizing high-efficiency energy transmi...

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Problems solved by technology

[0004] Although the processes in the prior art can reduce the eddy current loss, each process has its own disadvantages. For example, the crushed fragments in the rolling crushing process are disorderly and of different sizes, and the colloids are filled into the gaps of different sizes. It will cause problems such as different dielectric properties of the shielding sheet, excessive magnetic permeability difference, and large magnetic loss. Although the etching process and laser cutting process can effectively control the shape of the fragments and the width of the gap, the process is complicated and the process is relatively slow. Long, high cost, high pollution and high energy consumption

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