Heat dissipation insulating magnetic ring and preparation method thereof

Abstract

The invention belongs to the technical field of wireless charging magnetic attraction rings, and particularly discloses a heat dissipation insulating magnetic attraction ring and a preparation method thereof. The heat-dissipation insulating magnetic ring is composed of a composite insulating material substrate and a magnet. The preparation method comprises the step of combining the magnet and the composite insulating material substrate to obtain the heat-dissipation insulating magnetic ring. The non-metallic material is adopted to prepare the magnetic suction ring, the hysteresis effect can be avoided, heat generation is reduced, and the charging efficiency and safety are improved; in addition, the charging device also has excellent heat dissipation performance, heat generated by charging equipment or a magnet can be quickly dissipated into air, the charging safety is improved, and the charging power is ensured; the heat-dissipation insulating magnetic ring prepared by the invention has supporting performance and can be used as a mobile phone support, so that the practicability and convenience of the product are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless charging magnetic suction rings, and in particular to a heat dissipation insulating magnetic suction ring and a preparation method thereof. Background Art

[0002] With the increasing popularity of wireless charging technology, it has become a standard feature of many mobile phones. However, in order to protect their phones or make them more personalized, mobile phone users often put protective cases on their phones. Wearing a protective case will increase the distance between the phone and the wireless charger, which will in turn reduce the magnetic attraction strength, affect the alignment of the phone and the wireless charger, and thus affect the charging speed; at the same time, for some fixed wireless chargers with specific tilt angles, there is also a risk of the device falling.

[0003] In order to solve the above problems, a magnetic ring is usually added to the mobile phone case in the market to enhance the magnetism and ensure that the position of the mobile phone and the wireless charger are aligned. However, most of the magnetic ring brackets on the market are made of metal. With the development of wireless charging technology, the charging power is getting higher and higher, which leads to a new problem-hysteresis effect; in a changing magnetic field, the base of the wireless charging magnetic ring made of metal materials or the magnet itself may generate eddy currents, causing local overheating; at the same time, during the charging process, the mobile phone or charging device itself will also generate heat. This leads to a variety of heat being concentrated near the battery of the mobile phone or charging device, increasing the possibility of damage to the device, having an adverse effect on the battery, and may also increase the risk of fire. Moreover, the base of the wireless charging magnetic ring made of metal materials is prone to rust in a humid or corrosive environment, reducing the service life, thereby affecting the reliability of the device. The base of the wireless charging magnetic ring made of metal materials is usually heavy, which may affect the portability of the device and increase the burden on users.

[0004] Therefore, how to provide a heat dissipation insulating magnetic suction ring and its preparation method to minimize the hysteresis effect, improve the thermal conductivity and heat dissipation capacity of the magnetic suction ring, avoid heat concentration, and reduce the risk of equipment damage is a difficult problem to be solved urgently in this field. Summary of the invention

[0005] In view of this, the present invention provides a heat-dissipating insulating magnetic ring and a preparation method thereof to solve the problem that the existing magnetic ring is prone to cause hysteresis effect, resulting in heat concentration and damage to the wireless charging device; at the same time, the heat generated during the charging process of the wireless charging device can be quickly discharged to avoid excessive battery temperature.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A heat dissipation insulating magnetic attraction ring, the heat dissipation insulating magnetic attraction ring comprising a composite insulating material substrate and a magnet;

[0008] The composite insulating material substrate is composed of polymer materials, reinforcing fibers and inorganic micro-nano thermal conductive and heat dissipating particles;

[0009] A groove is arranged on the composite insulating material substrate, and the magnet is located in the groove.

[0010] Preferably, the preparation method of the composite insulating material substrate is: blending polymer materials, reinforcing fibers and inorganic micro-nano thermally conductive and heat-dissipating particles to obtain the composite insulating material substrate.

[0011] Preferably, the mass ratio of the polymer material, the reinforcing fiber and the inorganic micro-nano thermal conductive and heat dissipating particles is 100:10 to 100:8 to 50.

[0012] Preferably, the particle size of the inorganic micro-nano thermally conductive and heat dissipating particles is 20 nm to 200 μm.

[0013] Preferably, the inorganic micro-nano thermally conductive and heat dissipating particles include one or more of silicon carbide, silicon nitride, aluminum nitride, aluminum oxide, titanium dioxide, magnesium oxide, boron nitride, silicon oxide, graphite, graphene and carbon nanotubes;

[0014] The reinforcing fibers include one or more of glass fibers, carbon fibers, aramid fibers and carbon nanotubes;

[0015] The polymer material includes one or more of epoxy resin, phenolic resin, nylon, melamine, polyetheretherketone, polyphenylene sulfide, polyetherimide, polysulfone, polycarbonate, polyphenylene sulfide, and polyimide.

[0016] Another object of the present invention is to provide a method for preparing a heat dissipating insulating magnetic ring, comprising the following steps: combining a magnet with a composite insulating material substrate to obtain a heat dissipating insulating magnetic ring.

[0017] It can be seen from the above technical solutions that, compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention adopts non-metallic materials to prepare the magnetic attraction ring, and obtains an insulating magnetic attraction ring, which can avoid the hysteresis effect to the greatest extent, thereby reducing heat generation and improving charging efficiency and safety; after using the composite insulating material substrate of the present invention, it can still ensure that the magnetic attraction ring has sufficient magnetism, and ensure the alignment accuracy between the mobile phone and the wireless charger;

[0019] 2. The composite insulating material substrate disclosed in the present invention has excellent thermal conductivity and thermal radiation capabilities, which can evenly distribute the heat generated during wireless charging on the composite insulating material substrate, increase the heat dissipation area, and accelerate heat dissipation; thermal radiation directly radiates part of the heat into the air in the form of electromagnetic waves. The present invention can quickly dissipate the heat generated by the charging device or magnet into the air, improving charging safety;

[0020] 3. The heat dissipation insulating magnetic ring disclosed in the present invention can be designed into different styles, including a foldable form, and can also be used as a mobile phone holder, thereby increasing the practicality and convenience of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0022] Figure 1 A schematic top view of a heat dissipation insulating magnetic ring prepared in Example 1 of the present invention;

[0023] Figure 2 An exploded view of the heat dissipation insulating magnetic ring prepared in Example 1 of the present invention;

[0024] Figure 3 A schematic diagram of the structure of the heat dissipation insulating magnetic ring prepared in Example 1 of the present invention and used in conjunction with a mobile phone case;

[0025] Among them, 1. composite insulating material substrate; 2. groove; 3. magnet. DETAILED DESCRIPTION

[0026] The present invention provides a heat dissipation insulating magnetic attraction ring, the heat dissipation insulating magnetic attraction ring comprises a composite insulating material substrate and a magnet;

[0027] The composite insulating material substrate is composed of polymer materials, reinforcing fibers and inorganic micro-nano thermal conductive and heat dissipating particles;

[0028] A groove is arranged on the composite insulating material substrate, and the magnet is located in the groove.

[0029] In the present invention, the preparation method of the composite insulating material substrate is: blending polymer materials, reinforcing fibers and inorganic micro-nano thermally conductive and heat-dissipating particles to obtain the composite insulating material substrate;

[0030] In the present invention, the mass ratio of the polymer material, the reinforcing fiber and the inorganic micro-nano thermal conductive and heat dissipating particles is 100:10-100:8-50, preferably 100:20-80:10-40, further preferably 100:40-60:20-30, and further preferably 100:50:25.

[0031] In the present invention, the particle size of the inorganic micro-nano thermally conductive and heat-dissipating particles is 20nm to 200μm, specifically 40nm, 50nm, 80nm, 100nm, 200nm, 400nm, 500nm, 1μm, 20μm, 80μm, 100μm, and 150μm.

[0032] In the present invention, the inorganic micro-nano thermally conductive and heat dissipating particles include one or more of silicon carbide, silicon nitride, aluminum nitride, aluminum oxide, titanium dioxide, magnesium oxide, boron nitride, silicon oxide, graphite, graphene and carbon nanotubes;

[0033] The reinforcing fibers include one or more of glass fibers, carbon fibers, aramid fibers and carbon nanotubes;

[0034] The polymer material includes one or more of epoxy resin, phenolic resin, nylon, melamine, polyetheretherketone, polyphenylene sulfide, polyetherimide, polysulfone, polycarbonate, polyphenylene sulfide, and polyimide.

[0035] The present invention also provides a method for preparing a heat dissipation insulating magnetic ring, comprising the following steps:

[0036] The magnet is combined with a composite insulating material substrate to obtain a heat dissipation insulating magnetic suction ring.

[0037] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Example 1

[0039] 25 parts of thermally conductive and heat-dissipating particles of 500nm to 1μm (silicon nitride: silicon carbide: alumina mass ratio of 2:2:1) and 20 parts of chopped carbon fibers (length of 1 to 5mm) are added to 100 parts of epoxy resin for blending. After being fully mixed, the mixture is cured in a specific mold to obtain a composite insulating material substrate, the surface of which contains grooves for placing magnets.

[0040] The magnet is placed in a composite insulating material substrate to obtain a heat dissipation insulating magnetic suction ring.

[0041] The top view schematic diagram of the high heat dissipation insulating magnetic ring is as follows Figure 1 As shown, its exploded diagram is as follows Figure 2 As shown, the structural diagram of the mobile phone case is as follows Figure 3 As shown; Figure 1 to Figure 3 1 is the composite insulating material base, 2 is the groove, and 3 is the magnet. Figure 3It can be seen that the high heat dissipation insulating magnetic ring prepared by the present invention can be used as a mobile phone holder.

[0042] Example 2

[0043] 10 parts of thermally conductive and heat-dissipating particles (silicon nitride: silicon carbide: aluminum nitride mass ratio of 2:2:4) of 100nm to 2μm and 30 parts of glass fibers are added to 100 parts of epoxy resin for blending. After being fully mixed, the mixture is cured in a specific mold to obtain a composite insulating material substrate, the surface of which contains grooves for placing magnets.

[0044] The magnet is placed in a composite insulating material substrate to obtain a heat dissipation insulating magnetic suction ring.

[0045] Example 3

[0046] 38 parts of thermally conductive and heat-dissipating particles (silicon nitride: silicon carbide: aluminum nitride in a mass ratio of 2:2:4) of 1 μm to 50 μm and 35 parts of aramid fibers are added to 100 parts of phenolic resin and blended. After being fully mixed, the mixture is cured in a specific mold to obtain a composite insulating material substrate, the surface of which contains grooves for placing magnets.

[0047] The magnet is placed in a composite insulating material substrate to obtain a heat dissipation insulating magnetic suction ring.

[0048] Comparative Example 1

[0049] The only difference between this comparative example and Example 1 is that no heat-conductive and heat-dissipating particles are added.

[0050] Experimental Example 1

[0051] The heat dissipation performance of the magnetic rings prepared in Examples 1 to 3 and Comparative Example 1 was tested. The specific test method was to use a certain wireless charging device, install the magnetic rings prepared in Examples 1 to 3 and Comparative Example 1 in sequence, start charging from 20% power, keep the indoor temperature constant at 25°C, set the wireless charging time to 20 minutes, and record the device power at the end of charging, the temperature of the magnetic ring, and the temperature of the device back panel after removing the shell. The test results are shown in Table 1:

[0052] Table 1 Wireless charging test results

[0053]

[0054] The charging section selected in the experiment of the present invention is a fast charging section, which does not contain trickle charging, has a faster charging rate, generates more heat, and is easier to illustrate the effect of the heat dissipation product. It can be seen from Table 1 that after using the heat dissipation insulating magnetic suction ring described in the present invention, the surface temperature of the magnetic ring and the temperature of the device have dropped significantly, and a low charging temperature can be maintained to avoid the safety hazards caused by excessive battery temperature, and it can also avoid the device itself from limiting the charging power due to excessive battery temperature (generally when the battery temperature is close to 45°C, the wireless charging power will automatically drop). Comparative Example 1 does not add thermally conductive heat dissipating particles, and cannot achieve rapid heat conduction, resulting in lower heat dissipation efficiency. When the heat is locked near the charging device, it will cause the charging hot standby to generate too much heat, thereby affecting the charging rate. At the same time, we also tested a magnetic suction ring made of ordinary commercially available metal materials. At the end of 20 minutes of charging, the power was only 39.4%. The reason was severe heat generation, and the device reduced the charging power through a safety algorithm.

[0055] The heat dissipating insulating magnetic ring prepared by the present invention has a certain supporting strength. The bending strength of the composite insulating material substrate obtained in Examples 1 to 3 is above 100 MPa, and can be used as a mobile phone holder.

[0056] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0057] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A heat dissipation insulating magnetic ring, characterized in that: The heat dissipation insulating magnetic attraction ring comprises a composite insulating material base and a magnet; The composite insulating material substrate is composed of polymer materials, reinforcing fibers and inorganic micro-nano thermal conductive and heat dissipating particles; A groove is arranged on the composite insulating material substrate, and the magnet is located in the groove.

2. A heat dissipation insulating magnetic ring according to claim 1, characterized in that: The preparation method of the composite insulating material substrate is: blending polymer materials, reinforcing fibers and inorganic micro-nano thermally conductive and heat-dissipating particles to obtain the composite insulating material substrate.

3. A heat dissipation insulating magnetic ring according to claim 2, characterized in that: The mass ratio of the polymer material, the reinforcing fiber and the inorganic micro-nano thermal conductive and heat dissipating particles is 100:10 to 100:8 to 50.

4. A heat dissipation insulating magnetic ring according to claim 2 or 3, characterized in that: The particle size of the inorganic micro-nano thermally conductive and heat dissipating particles is 20nm-200μm.

5. The heat dissipation insulating magnetic ring according to claim 4, characterized in that: The inorganic micro-nano thermally conductive and heat dissipating particles include one or more of silicon carbide, silicon nitride, aluminum nitride, aluminum oxide, titanium dioxide, magnesium oxide, boron nitride, silicon oxide, graphite, graphene and carbon nanotubes; The reinforcing fibers include one or more of glass fibers, carbon fibers, aramid fibers and carbon nanotubes; The polymer material includes one or more of epoxy resin, phenolic resin, nylon, melamine, polyetheretherketone, polyphenylene sulfide, polyetherimide, polysulfone, polycarbonate, polyphenylene sulfide, and polyimide.

6. A method for preparing a heat dissipating insulating magnetic ring according to any one of claims 1 to 5, characterized in that: The method comprises the following steps: combining a magnet with a composite insulating material substrate to obtain a heat dissipating insulating magnetic attraction ring.

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