WO2024090878A1 - Composite heat dissipation hybrid tim sheet - Google Patents

Abstract

The present invention relates to a composite heat dissipation hybrid TIM sheet which is disposed between a heat sink and a heat source and composed of a heat-conductive sheet in which an auxiliary layer comprising a TIM layer or a heat-dissipating coating layer is laminated on one side, wherein the heat-conductive sheet is provided with a wing portion protruding outside the heat source and maximizes the heat dissipation effect.

Description

Composite heat dissipation hybrid TIM sheet

The present invention relates to a composite heat dissipation hybrid TIM sheet.

A heatsink is currently the most commonly used heat dissipation device in the electronics industry and is a device that uses a large surface area to dissipate heat through the contact area with air or water.

Basically, plate fins and pin fins are most commonly used, and in addition, much research is being conducted to achieve higher heat dissipation performance by adjusting the shape or inclination of the fins.

However, because existing heat sinks occupy a large volume and weight within the device, research to minimize the volume of the heat sink is needed in the electronic device industry, which is currently pursuing miniaturization, thinness, and weight reduction.

In a related technology, in the "composite heat dissipation film" registered by the applicant of the present invention (Korean Patent Publication No. 10-1859005, Patent Document 1), a silane sol solution is coated on a base film, and metal particles are deposited on the outside. A heat dissipation film having an insulating and electromagnetic wave blocking effect by forming a coating layer is disclosed.

Patent Document 1 has a problem in that although it is a material that provides both insulation and heat dissipation effects, it does not provide a high heat dissipation effect.

In addition, "Horizontal heat-conducting sheet and method of manufacturing the same" (Korean Patent Publication No. 10-0901526, Patent Document 2) includes a horizontal heat-conducting sheet layer including an acrylic adhesive layer, a horizontal heat-conducting sheet layer containing flake-type heat-conductive powder, and a tape layer. An example of improving heat conduction performance has been disclosed.

Patent Document 2 focuses on increasing the horizontal heat conduction performance of the material, but there are limitations in improving heat conduction characteristics based on physical properties.

Recently, efforts have been made to minimize the area of the liquid crystal border as well as the thickness of the case surrounding the substrate for various electronic products such as large and small home appliances, PCs, and laptops. In order to minimize the volume of the heat sink and increase the heat dissipation effect, heat It is necessary to use thermal interface material (TIM) or heat dissipation coating, but efforts based simply on the characteristics of the material cause many difficulties due to issues such as design, price, and weight.

Accordingly, there is a need to develop technology that can improve heat dissipation performance more effectively by going beyond the limitations of thermal interface materials and heat dissipation coatings while minimizing the increase in heat sink volume.

*Prior art literature*

(Patent Document 1) KR 10-1859005 (2018.05.11)

(Patent Document 2) KR 10-0901526 (2009.06.01)

The composite heat dissipation hybrid TIM sheet of the present invention is intended to solve the problems occurring in the above-described prior art, and has a TIM layer or heat source made of a thermal interface material that transfers heat from the heat source in the vertical direction between the heat sink and the heat source. A heat dissipation coating layer that radiates and radiates heat to the outside is formed by stacking, but unlike the conventional heat dissipation film whose size is the same as the heat source size, it is made of a size larger than the heat source area and has a wing protruding from the end of the heat source. A thermal conductive sheet that radiates heat horizontally and to the outside is provided to minimize the volume of the heat sink while increasing the heat dissipation effect.

In other words, when heat is transferred from the heat source to the heat sink, a significant amount of heat is horizontally conducted through the wings of the heat conduction sheet located in the middle and discharged to the outside, thereby reducing the heat transferred to the heat sink, thereby minimizing the volume of the heat sink. It is intended to be.

In particular, since the TIM layer with vertical heat conduction characteristics and the heat conduction sheet with horizontal heat conduction characteristics are stacked side by side, when a thick TIM layer is used, the horizontal heat conductivity is relatively lower than a thin TIM layer, so take advantage of this fact. The goal is to maximize space utilization in the vertical direction by laminating a thin TIM layer on a heat-conducting sheet.

In order to solve the above-mentioned problem, the composite heat dissipation hybrid TIM sheet of the present invention has one surface in contact with the heat source (1), the other surface in contact with the heat sink (2), and the heat of the heat source (1) is transferred to the heat sink ( In the composite heat dissipation sheet that transmits to 2), a wing portion 11 is formed that has an area larger than that of the heat source 1 and protrudes outward from the end of the heat source 1 in a plan view, a heat conduction sheet (10) that transfers the received heat in a horizontal direction and radiates it to the outside; It is composed of either a TIM layer 21 made of a thermal interface material to transmit heat from the heat source in the vertical direction or a heat dissipation coating layer 22 that radiates and radiates heat from the heat source to the outside, and the heat conduction sheet 10 ) and an auxiliary layer 20 laminated on the top or bottom of the layer.

In the above configuration, the auxiliary layer 20 is characterized in that it is a TIM layer 21 laminated on both surfaces of the heat-conducting sheet 10.

In the above configuration, the auxiliary layer 20 includes a heat dissipation coating layer 22 laminated on the top or bottom of the heat conduction sheet 10, an upper portion of the heat conduction sheet 10 on which the heat dissipation coating layer 22 is laminated, and It is characterized by a TIM layer 21 laminated on the lower part.

In the above configuration, the auxiliary layer 20 includes a heat dissipation coating layer 22 laminated on one of the top or bottom of the heat-conducting sheet 10, and a heat dissipation coating layer 22 laminated on either the top or bottom of the heat-conducting sheet 10. It is characterized by a stacked TIM layer (21).

In the above configuration, the auxiliary layer 20 includes a heat dissipation coating layer 22 laminated on one of the top or bottom of the heat-conducting sheet 10, and a heat dissipation coating layer 22 laminated on either the top or bottom of the heat-conducting sheet 10. It is characterized by a stacked TIM layer (21).

In the above configuration, the auxiliary layer 20 is characterized in that it is a heat dissipation coating layer 22 laminated on both surfaces of the heat-conducting sheet 10.

In the above configuration, the TIM layer 21 is laminated on the surface of one of the two heat dissipation coating layers 22.

In the above configuration, the heat-conducting sheet 10 and the auxiliary layer 20 are characterized in that they are laminated in a double-layer or multi-layer structure.

In the above configuration, the heat-conducting sheet 10 is made of a material containing any one of aluminum, copper, magnesium, and graphite, and the TIM layer 21 is made of a thermal adhesive, thermal pad, thermal grease, thermal adhesive, and thermal paste. It is made of any one of sheet tapes, and the heat dissipation coating layer 22 is characterized by being made of any one of acrylic, urethane, silicone, foamed polyester, and epoxy heat dissipation paint.

In the above configuration, the heat-conducting sheet 10 has a thickness of 20㎛ ~ 1.5mm, the heat dissipation coating layer has a thickness of 20 ~ 30㎛, and the TIM layer has a thickness of 10㎛ ~ 2.0mm. It is characterized by being carried out.

In the above configuration, heat dissipation coating layers 22 are laminated on both surfaces of the heat conductive sheet 10, and a TIM layer 21 is laminated on the outer surface of each heat dissipation coating layer 22, wherein the heat dissipation coating layer ( 22) has the same size as the heat-conducting sheet 10, and the TIM layer 21 has the same size as the heat source 1.

In the above configuration, the wing portion 11 is characterized in that it is formed with a plurality of embossing, irregularities, or is formed with a plurality of bends.

In the above configuration, a heat-insulating film is attached to the bottom of the wing portion 11 or a heat-insulating coating is applied to suppress heat radiation to the bottom of the wing portion 11.

According to the present invention, between the heat sink and the heat source, a TIM layer made of a thermal interface material that transmits the heat of the heat source in the vertical direction and a heat dissipation coating layer that radiates and radiates the heat of the heat source to the outside are laminated. Unlike the size of the heat dissipation film of the same size as the heat source, it is made of a size larger than the heat source area and is provided with a heat conduction sheet that radiates heat from the heat source horizontally and to the outside with wings protruding from the end of the heat source, thereby reducing the volume of the heat sink. It is possible to increase the heat dissipation effect while minimizing it.

In other words, when heat is transferred from the heat source to the heat sink, a significant amount of heat is horizontally conducted through the wings of the heat conduction sheet located in the middle and discharged to the outside, thereby reducing the heat transferred to the heat sink, thereby minimizing the volume of the heat sink. There will be.

In particular, since the TIM layer with vertical heat conduction characteristics and the heat conduction sheet with horizontal heat conduction characteristics are stacked side by side, when a thick TIM layer is used, the horizontal heat conductivity is relatively lower than a thin TIM layer, so take advantage of this fact. By stacking a thin TIM layer on a heat-conducting sheet, it is possible to maximize space utilization in the vertical direction.

1 is a diagram showing an example of a composite heat dissipation hybrid TIM sheet of the present invention.

Figure 2 is a photograph showing test pieces for experiments in the present invention.

Figure 3 is a graph showing the temperature over time by generating heat in the test pieces in the present invention.

Figure 4 is a diagram showing other embodiments of the present invention.

Figure 5 is a photograph showing the state in which the sheet of the present invention forms a multi-layer structure.

Figure 6 is a photograph showing an example of an object to which the sheet of the present invention is applied.

Figure 7 is a schematic diagram showing the heat dissipation action of a conventional heat sink.

Figure 8 is a schematic diagram showing the heat dissipation effect by the composite heat dissipation hybrid TIM sheet of the present invention.

Figure 9 is a view showing an example in which irregularities, wrinkles, embossing, and bending are formed on the wing portion of the heat-conducting sheet in the present invention.

Figure 10 is a schematic diagram showing the heat dissipation action showing an example in which a heat shield film is attached to the bottom of the wing in the present invention.

*Detailed explanation of main symbols in the drawing*

1: heat source

2: heat sink

10: Heat conduction sheet

11: wing part

20: Auxiliary layer

21: TIM layer

22: heat radiation coating layer

30: Heat insulation film

Thermal pads, thermal grease, thermal paste, thermal adhesive, thermal sheet tape, etc. used as existing TIM materials are manufactured to the same size as the heat source, and as shown in the schematic diagram of Figure 7, the heat coming from the heat source is directed only vertically. Since heat is only sent and released through the heat sink, even if the heat sink size is increased or the surface area is increased, the heat source temperature can actually only be slightly lowered.

The inventor of the present application goes beyond the existing common sense and provides a composite heat dissipation hybrid TIM sheet including a heat conductive sheet with wings protruding outside the heat source between the heat source and the heat sink, as shown in the schematic diagram of FIG. 8. The horizontal thermal conductivity through the heat conduction sheet, the vertical thermal conductivity using the TIM layer, and the heat radiation effect through the heat dissipation coating layer are simultaneously demonstrated to realize an additional heat dissipation effect of 15 to 25°C at a low cost, making it easy to slim and lighten the product. And durability could be improved.

Hereinafter, the composite heat dissipation hybrid TIM sheet of the present invention will be described in detail through the attached drawings.

As shown in FIG. 1, the composite heat dissipation hybrid TIM sheet of the present invention has one surface in contact with the heat source 1 and the other surface in contact with the heat sink 2, and heat from the heat source 1 is transferred to the heat sink ( It is designed to be delivered to 2).

The composite heat dissipation hybrid TIM sheet of the present invention consists of a heat-conducting sheet (10) and an auxiliary layer (20).

As shown in FIG. 1, the heat conductive sheet 10 has a larger area than the heat source 1, and wings 11 are formed that protrude outward from the end of the heat source 1 in a plan view.

In addition, the heat-conducting sheet 10 is made of a metal or non-metallic material with high thermal conductivity, such as aluminum, copper, magnesium, graphite, etc., and the above-mentioned materials may be made alone, or may be mixed or synthesized with each other.

The wider the area of the heat conduction sheet 10 is than the heat source area, the better.

Looking at the table below, when the heat-conducting sheet 10 occupies an area approximately 5 to 7 times the area of the heat source, the heat-conducting sheet 10 transfers the heat received from the heat source 1 in the horizontal direction, and the wing portion 11 Heat is naturally released to the outside.

At this time, heat is also released through the bottom of the wing portion 11, and there may be parts that are at risk of being damaged by heat.

Accordingly, as shown in FIG. 10, the bottom of the wing portion 11 may be coated with a heat insulating film 30 made of a material such as PVC.

When the heat-dissipating coating layer 22 is laminated on the lower part of the heat-conducting sheet 10, this heat-insulating film or heat-insulating coating may be attached or coated on the bottom of the heat-dissipating coating layer 22 corresponding to the position of the wing portion 11, The same can be applied even when the following wrinkles, embossing, and bending parts are formed.

In addition, as a way to overcome the problem of securing installation space with adjacent components, the wing portion 11 forms wrinkles, emboss, etc. or multiple bends, as shown in FIG. 9, thereby increasing space utilization and protecting adjacent components. It can be ensured that it does not interfere with the installation space.

The horizontal thermal conductivity and vertical thermal conductivity according to the thickness of the heat-conducting sheet 10 are shown in Table 1 below.

Table 1 is based on #1050 aluminum sheet.

Thickness (mm)	Vertical thermal conductivity (W/m.K)	Horizontal thermal conductivity (W/m.K)
0.3	10.4~10.5	220~230
0.5	14.0~14.2	220~230
0.8	20.0~20.5	220~230
1.0	25,1~25.4	220~230

Looking at Table 1 above, as the thickness increases, the horizontal thermal conductivity does not change, but the vertical thermal conductivity only increases, and in actual temperature, it was found that each 0.2mm thickness increase has an additional heat dissipation effect of about 1°C. Therefore, heat conduction Even if the thickness of the sheet 10 is thin, there is little change in horizontal thermal conductivity, making it easy to slim the product.

The auxiliary layer 20 is composed of a TIM layer 21 made of a thermal interface material to transmit heat from the heat source in the vertical direction or a heat dissipation coating layer 22 that radiates and radiates heat from the heat source to the outside. This auxiliary layer 20 ) is laminated on the top or bottom of the heat-conducting sheet 10.

Basically, it is preferable that it is located on the upper part of the heat-conducting sheet 10 to prevent direct contact between the heat-conducting sheet 10 and the heat sink 2.

If the heat-conducting sheet 10 and the heat sink 2 are in direct contact, the heat-conducting sheet 10 may function as an integral part of the heat sink 2, and the vertical heat conduction characteristics may deteriorate, thereby reducing the heat dissipation effect.

Here, the TIM layer 21 serves to send the heat generated from the heat source 1 as vertically as possible to the heat sink 2, and the heat dissipation coating layer 22 transfers the heat from the heat sink 2 to the atmosphere or heat sink 2. ) plays the role of dissipating heat as much as possible through thermal radiation and thermal radiation.

The TIM layer 21 may be composed of a thermal pad, thermal grease, thermal paste, thermal adhesive, thermal sheet tape, etc. made of acrylic, urethane, silicon, etc.

More preferably, it can be molded by mixing thermal conductive ceramic powder and polymer.

Specifically, raw materials such as alumina, modified acrylic, etc. are premixed and pre-dispersed, and after completion of the premixing, air bubbles are removed through a degassing process, and then the slurry on which the degassing process is completed is mixed to produce the agglomerated powder. After dispersion, the mixed slurry may be attached to the surface of the carrier film through casting equipment.

At this time, it is preferable to use alumina/BN with a particle size of 5㎛~100㎛ as the filler as a raw material. Basically, the mixing ratio of modified acrylic binder and ceramic is 20~25% by weight: 75~80% by weight. This is desirable.

At this time, urethane sheet, silicone sheet, or carbon fiber sheet may be used instead of modified acrylic.

In addition, three types of ceramics can be used to obtain high thermal conductivity by improving the thermal conductivity channel when mixing with resin.

For example, when manufacturing at 10 watt/m.k or less, it is desirable to use a ratio of 50% by weight of spherical alumina, 20% by weight of plate-shaped alumina, and about 30% by weight of amorphous alumina, and when manufacturing at 10 watt/m.k or more, it is desirable to use 20% by weight of spherical BN/MgO. It is preferable that the ratio by weight is 30% by weight of spherical alumina, 20% by weight of plate-shaped alumina, 20% by weight of amorphous alumina, and 10% by weight of amorphous BN/MgO.

Here, by increasing the amount of BN/MgO, which has high thermal conductivity, it is possible to achieve more than 15 watt/m.k.

The heat dissipation coating layer 22 serves to radiate heat transferred from the heat source 1 to the adjacent layer and is formed by coating a silan sol solution formed by dissolving silane in an alcoholic solvent to form a sol, or acrylic or urethane. , silicone, foamed polyester, epoxy ceramic paint, etc. can be coated and formed.

or tetramethoxysilane 6% by weight, 2-propanol 22% by weight, 2-butoxyethanol 17% by weight, 1-butoxyethanol 18% by weight. After making a sol-state silane solution by adding 8% weight of xylene, 4% weight of 2-butanol, and 25% weight of resin, the prepared sol-state silane It can also be formed by coating a solution.

An example of a composite heat dissipation hybrid TIM sheet having the above structure is formed by stacking the TIM layer 21, the heat conduction sheet 10, and the TIM layer 21 in that order from top to bottom between the heat source 1 and the heat sink 2. , TIM layer 21, heat dissipation coating layer 22, heat conduction sheet 10, and TIM layer 21 are laminated in that order, or TIM layer 21, heat conduction sheet 10, heat dissipation coating layer 22, TIM It may be formed by stacking the layers 21 in that order, or the TIM layer 21, heat dissipation coating layer 22, heat conduction sheet 10, heat dissipation coating layer 22, and TIM layer 21 as shown in FIG. 1.

Alternatively, the heat dissipation coating layer 22, the heat conduction sheet 10, and the TIM layer 21 may be laminated in that order, or the TIM layer 21, the heat conduction sheet 10, and the heat dissipation coating layer 22 may be laminated in that order.

Alternatively, the heat dissipation coating layer 22, the heat conduction sheet 10, and the heat dissipation coating layer 22 are laminated in that order, or the heat dissipation coating layer 22, the heat conduction sheet 10, the heat dissipation coating layer 22, and the TIM layer 21 are laminated in that order. Alternatively, the TIM layer 21, the heat dissipation coating layer 22, the heat conduction sheet 10, and the heat dissipation coating layer 22 may be laminated in that order.

Figure 5 shows several examples of such stacking.

In addition, the TIM layer 21 is formed to be the same size as the heat source 1 so that it does not protrude to the outside of the heat source 1, and the heat dissipation coating layer 22 may be formed to be the same size as the heat source 1. and may be formed in the same size as the heat-conducting sheet 10.

This is because the heat dissipation coating layer 22 has the property of radiating and radiating heat to the outside, so when it is formed larger in size than the heat source 1, like the heat conductive sheet 10, the heat dissipation effect is improved.

However, since the heat dissipation coating layer 22 is formed by coating as the word implies, it cannot maintain a constant hardness by itself, so it will be formed to a large extent only when it is formed as a continuous layer with the heat conductive sheet 10.

In addition, the laminated structure configured as above may be repeatedly laminated in multiple or multi-layers as shown in FIG. 5.

Hereinafter, the composite heat dissipation hybrid TIM sheet of the present invention will be described through experiments.

<Experimental Example 1>

As a heat source, a thermo couple was placed in a copper heating block measuring 3.7 cm wide, 6.0 cm long, and 1.0 cm thick, and a temperature sensor was installed inside.

The heat sink was prepared by cutting #1050 aluminum sheet into 5 cm wide, 10 cm long, and 0.5 cm thick.

In addition, power was applied to the heat source, the heat source was operated for 1 hour, and the temperature was measured using a Yokogawa MV2000 model thermocouple temperature recorder.

In Comparative Example 1, only the heat source was used, and in Comparative Example 2, a heat sink was attached to the heat source.

In Comparative Example 3, a 25㎛ heat dissipation coating layer having the same size as the heat source area was formed on the upper and lower surfaces of a #1050 aluminum sheet with a thickness of 0.3 mm and a thickness of 25㎛ on the outside of the heat dissipation coating layer on both sides. A TIM layer with a thickness of 65㎛ and a vertical thermal conductivity of 1W/m.K was formed.

In Example 1, a 25㎛ heat dissipation coating layer having the same size as the sheet area was formed on the upper and lower surfaces of a #1050 aluminum sheet with a width of 8.0 cm, a length of 12.0 cm, and a thickness of 0.3 mm, and a heat dissipation coating layer with a thickness of 65 μm was formed on the outside of the heat dissipation coating layer on both sides. ㎛, a TIM layer with a vertical thermal conductivity of 1W/m.K was formed.

Here, the TIM layer was set to the same size as the heat source area.

The aluminum sheet and heat dissipation coating layer of Example 1 have an area approximately 4.5 times the area of the heat source and approximately twice the area of the heat sink.

Example 2 was manufactured in the same manner as Example 1, but the size of the aluminum sheet was 12 cm wide, 12 cm long, and 0.3 mm thick, so that it was about 6.5 times the area of the heat source and about 3 times the area of the heat sink.

Figure 2 is a photograph showing the specimens and experimental conditions of Comparative Examples 1 and 2 and Examples 1 and 2, and Figure 3 is a graph of the measured temperature.

In addition, the experimental results are shown in Table 2 below.

division	Temperature (℃)	Heat dissipation effect (℃, based on heat sink)
Comparative Example 1	105.9	-
Comparative example 2	86.2	-
Comparative Example 3	81.2	5.0
Example 1	71.1	15.1
Example 2	60.8	25.4

As shown in Table 2, when comparing Comparative Example 3, in which the TIM layer and the heat dissipation coating layer were formed similarly to Examples 1 and 2, with Examples 1 and 2, the heat dissipation effect based on the heat sink in Examples 1 and 2 was 15 to 25. While it had an excellent heat dissipation effect of about ℃, in the case of Comparative Example 3, it was found to be only 5.0 ℃.

As a result, it was found that the heat dissipation effect was significantly improved when the wings were provided.

<Experimental Example 2>

A 65㎛ thick thermal sheet tape with a vertical thermal conductivity of 1 W/m.K was formed as the TIM layer (21), and a #1050 aluminum 0.3 mm plate with a vertical thermal conductivity of 10 W/m.K was selected as the thermal conductive sheet (10). Next, Example 3 was manufactured by cutting the TIM layer 21 and the heat-conducting sheet 10 to the same size as Example 1, and then laminating the TIM layer 21 on the top and bottom of the heat-conducting sheet 10.

In addition, a 250㎛ thick thermal sheet tape with a vertical thermal conductivity of 3 W/m.K was formed as the TIM layer (21), and a #1050 aluminum 0.3t plate with a vertical thermal conductivity of 10 W/m.K was formed as the thermal conductive sheet (10). Then, the TIM layer 21 and the heat-conducting sheet 10 were each cut to the same size as Example 1, and then the TIM layer 21 was laminated on the top and bottom of the heat-conducting sheet 10 to produce Example 4. did.

Next, the vertical thermal conductivity and horizontal thermal conductivity of each of Examples 3 and 4 prepared were measured.

As a result, the vertical thermal conductivity of Example 3 was 5.7W/m.K, while the vertical thermal conductivity of Example 4 was measured at 2.3W/m.K, and the horizontal thermal conductivity of Example 3 was measured at 192W/m.K. In case 4, it was measured at 165W/m.K.

It is generally thought that the heat dissipation effect will be good if a TIM with high vertical thermal conductivity is used, but as a result of the above experiment, when a thin TIM with low vertical thermal conductivity is matched with the thermal conductive sheet 10, the vertical and horizontal thermal conductivity decreases the thermal resistance. Since this is small, it can be seen that the heat dissipation effect increases further.

That is, as a result of the above experiment, it can be seen that the lower the vertical thermal conductivity and thinner the TIM layer 21 is, the higher the horizontal and vertical thermal conductivity are, allowing for more rapid heat dissipation.

Through this, it can be seen that when the thermal conductive sheet 10 with the wings 11 is used and the TIM layer 21, which has low vertical thermal conductivity and is thin, is attached, the heat dissipation effect through the wings 11 is excellent. .

That is, when forming a heat dissipation sheet in which the heat conduction sheet 10 and the TIM layer 21 are combined, not only the thickness of the heat sink 2 but also the thickness of the TIM layer 21 can be reduced compared to other composite heat dissipation sheets. This will enable efficient heat dissipation in narrower spaces (especially heights).

In addition, as described above, there is little change in horizontal thermal conductivity of the heat-conducting sheet 10 depending on the thickness, and the lower the thickness and vertical thermal conductivity of the TIM layer 21 attached to the heat-conducting sheet 10, the lower the horizontal thermal conductivity. As it helps to increase the temperature, the composite heat dissipation hybrid TIM sheet according to the present invention can be composed of a heat conductive sheet (10) with a thickness of 20㎛ ~ 1.5mm, a heat dissipation coating layer of 20 ~ 30㎛, and a TIM layer of 10㎛ ~ 2.0mm. there is.

In this case, the required height is less than 5 mm, which can greatly help in slimming the product.

As shown in FIG. 6, the composite heat dissipation hybrid TIM sheet of the present invention described above can be used in 5G repeaters equipped with heat sources, power semiconductors, displays, as well as various semiconductors, automobiles such as electric and hydrogen cars, energy storage devices, and LEDs. It can be applied to all fields that require heat dissipation due to heat sources, such as lighting, laptops, smartphones, PCs, and tablet PCs.

Claims (8)

1. In the composite heat dissipation sheet, where one surface is in contact with the heat source (1), the other surface is in contact with the heat sink (2), and transfers heat from the heat source (1) to the heat sink (2),

   It has a larger area than the heat source 1 and is formed with a wing portion 11 that protrudes outward from the end of the heat source 1 in a plan view, and transfers heat received from the heat source 1 in the horizontal direction and externally. A heat conductive sheet (10) that radiates to;

   It is composed of either a TIM layer 21 made of a thermal interface material to transmit heat from the heat source in the vertical direction or a heat dissipation coating layer 22 that radiates and radiates heat from the heat source to the outside, and the heat conduction sheet 10 ) and an auxiliary layer 20 laminated on the top or bottom of the

   The auxiliary layer 20 includes a heat dissipation coating layer 22 laminated on the top or bottom of the heat conduction sheet 10, and a TIM layer laminated on the top and bottom of the heat conduction sheet 10 on which the heat dissipation coating layer 22 is laminated. (21), characterized in that,

   Composite heat dissipation hybrid TIM sheet.
2. In the composite heat dissipation sheet, where one surface is in contact with the heat source (1), the other surface is in contact with the heat sink (2), and transfers heat from the heat source (1) to the heat sink (2),

   It has a larger area than the heat source 1 and is formed with a wing portion 11 that protrudes outward from the end of the heat source 1 in a plan view, and transfers heat received from the heat source 1 in the horizontal direction and externally. A heat conductive sheet (10) that radiates to;

   It is composed of either a TIM layer 21 made of a thermal interface material to transmit heat from the heat source in the vertical direction or a heat dissipation coating layer 22 that radiates and radiates heat from the heat source to the outside, and the heat conduction sheet 10 ) and an auxiliary layer 20 laminated on the top or bottom of the

   The auxiliary layer 20 includes a heat dissipation coating layer 22 laminated on one of the top or bottom of the heat-conducting sheet 10, and a TIM layer 21 laminated on the other of the top or bottom of the heat-conducting sheet 10. ), characterized in that,

   Composite heat dissipation hybrid TIM sheet.
3. According to any one of claims 1 and 2,

   The heat-conducting sheet 10 and the auxiliary layer 20 are characterized in that they are laminated in a double-layer or multi-layer structure,

   Composite heat dissipation hybrid TIM sheet.
4. According to any one of claims 1 to 2,

   The heat-conducting sheet 10 is made of a material containing any one of aluminum, copper, magnesium, and graphite,

   The TIM layer 21 is made of any one of thermal adhesive, thermal pad, thermal grease, thermal adhesive, and thermal sheet tape,

   The heat dissipation coating layer 22 is characterized in that it is made of any one of acrylic, urethane, silicone, foamed polyester, and epoxy heat dissipation paint.

   Composite heat dissipation hybrid TIM sheet.
5. According to any one of claims 1 to 2,

   The heat-conducting sheet 10 has a thickness of 20㎛ ~ 1.5mm,

   The heat dissipating coating layer has a thickness of 20 to 30㎛,

   The TIM layer is characterized in that it has a thickness of 10㎛ ~ 2.0mm,

   Composite heat dissipation hybrid TIM sheet.
6. In the composite heat dissipation sheet, where one surface is in contact with the heat source (1), the other surface is in contact with the heat sink (2), and transfers heat from the heat source (1) to the heat sink (2),

   It has a larger area than the heat source 1 and is formed with a wing portion 11 that protrudes outward from the end of the heat source 1 in a plan view, and transfers heat received from the heat source 1 in the horizontal direction and externally. A heat conductive sheet (10) that emits heat;

   It is composed of either a TIM layer 21 made of a thermal interface material to transmit heat from the heat source in the vertical direction or a heat dissipation coating layer 22 that radiates and radiates heat from the heat source to the outside, and the heat conduction sheet 10 ) and an auxiliary layer 20 laminated on the top or bottom of the

   Heat dissipation coating layers 22 are laminated on both surfaces of the heat conduction sheet 10,

   A TIM layer 21 is laminated on the outer surface of each heat dissipation coating layer 22,

   The heat dissipation coating layer 22 is made of the same size as the heat-conducting sheet 10,

   The TIM layer 21 is characterized in that it has the same size as the heat source 1.

   Composite heat dissipation hybrid TIM sheet.
7. According to any one of claims 1 to 2,

   The wing portion 11 is characterized in that it is formed with a plurality of emboss, irregularities, or is formed with a plurality of bends.

   Composite heat dissipation hybrid TIM sheet.
8. According to any one of claims 1 to 2,

   Characterized in that a heat insulating film 30 is attached to the bottom of the wing portion 11 or is treated with a heat insulating coating to suppress heat radiation to the bottom of the wing portion 11.

   Composite heat dissipation hybrid TIM sheet.

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