JP5683799B2 - LED heat sink for automobile - Google Patents

LED heat sink for automobile Download PDF

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Publication number
JP5683799B2
JP5683799B2 JP2009212318A JP2009212318A JP5683799B2 JP 5683799 B2 JP5683799 B2 JP 5683799B2 JP 2009212318 A JP2009212318 A JP 2009212318A JP 2009212318 A JP2009212318 A JP 2009212318A JP 5683799 B2 JP5683799 B2 JP 5683799B2
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heat
heat sink
resin
receiving surface
led
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JP2011061157A (en
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鈴木 英二
英二 鈴木
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スターライト工業株式会社
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Description

The present invention relates to an automotive LED heat sink , and more particularly to an automotive LED heat sink in which a metal and a thermally conductive resin are combined.

  Conventionally, heat sinks are used to cool CPUs, semiconductor power devices, and the like. Furthermore, recently, high-intensity LED lamps have begun to be used in automobile headlights for power saving and long life, and heat sinks are used to cool these high-intensity LEDs. A general heat sink is made of a metal material having high thermal conductivity such as pure aluminum or an aluminum alloy, and is formed in a shape in which a plurality of fins are arranged on a flat plate-shaped heat receiving surface by die casting or the like.

  By the way, in recent years, there is a strict demand for weight reduction not only in electronic equipment but also in automobiles, and it is necessary to reduce weight while maintaining heat dissipation characteristics in heat sinks.

  Patent Document 1 has a metal base portion having a thermal conductivity of at least 150 W / mK and a plurality of fins mounted perpendicularly to the base portion, and the fins were pressure-cured at high temperature. A heat sink composed of a resin-impregnated graphite material is disclosed. Here, when aluminum is used as the metal base, it is said that the overall weight can be reduced while maintaining higher thermal performance than the aluminum heat sink.

  Patent Document 2 discloses a resin heat sink partially or wholly formed of a resin material, in which the carbon material and ceramic powder and / or soft magnetic powder are uniformly dispersed in the resin. The ratio of the carbon material in the resin material is 15 to 60% by volume, the ratio of the ceramic powder is 5 to 40% by volume, and the total of the carbon material and the ceramic powder is 20 to 80% by volume. A resin heat sink is disclosed. Further, the carbon material includes a filamentous carbon material having a thermal conductivity of 100 W / mK or more, and a heat transfer body made of a material having a thermal conductivity of 100 W / mK or more is mounted on the heat source grounding surface of the heat sink. Is also disclosed. Here, the material constituting the heat transfer body is selected from the group consisting of copper, copper alloy, aluminum, aluminum alloy, aluminum nitride, and carbon material.

  However, the heat sink disclosed in Patent Document 1 has a drawback in that fins are made of a resin-impregnated graphite material, and individual fins must be vertically attached to a metal base, resulting in a significant increase in manufacturing cost. In addition, in the heat sink of Patent Document 2, in order to have heat dissipation and electromagnetic wave shielding properties, while using carbon fibers and carbon nanotubes having high conductivity and excellent thermal conductivity as a carbon material, By using a relatively large amount of ceramic powder and / or soft magnetic powder, the material cost increases, and the specific gravity cannot be significantly reduced as compared with that made of aluminum.

  Incidentally, when an LED is used for an automobile headlight, a plurality of LED modules of 5 W or more are used. A high-intensity LED module generally generates a larger amount of heat than an LED used for applications such as a display panel. In addition, in order to make it difficult for condensation on automobile lighting to cause dew condensation, the entire illumination mechanism is hermetically sealed or close to the hermetic structure to prevent moisture from entering. Such a structure inevitably tends to be at a high temperature because the air flow rate decreases. Here, the LED module is a component including one or more light emitting elements in one LED lens, and the heat sink for heat dissipation used for this has a larger area for each surface for heat dissipation than the light emitting area of the LED. It is a feature. In general, unlike HID and halogen lamps, LEDs are known to have reduced light-emitting performance and lifetime at high temperatures. Cooling is unavoidable, especially for high-intensity LEDs because they generate a large amount of local heat. Technology.

Special table 2008-512852 gazette JP 2009-016415 A

Therefore, in view of the above-described situation, the present invention intends to solve the problem that the overall weight can be reduced as compared with that made of aluminum while maintaining heat conductivity and dissipation. Another object of the present invention is to provide an automotive LED heat sink that suppresses an increase in material cost and is relatively easy to manufacture.

The present invention is a heat sink used for cooling a high-brightness LED module of 1 W or more, which is a combination of at least a heat transfer plate made of a good heat conductive metal and a heat sink body formed of a heat conductive resin, The conductive resin has a thermal conductivity of 2.5 W / m · K or more and a specific gravity of 1.3 to 1 containing a thermoplastic resin as a matrix component and containing at least one filler selected from carbon fibers and graphite . 6 is a heat sink for LED which is a heat-receiving surface provided with the heat transfer plate along the heat-receiving surface portion of the heat sink body to join the LED module , wherein the good heat conductor metal is aluminum, or Made of magnesium or their alloys, selected from materials with a thermal conductivity of 20 W / m · K or higher, and heat The sink body is formed of the heat conductive resin and has a shape in which a plurality of fins are arranged in a line on the heat receiving surface, and the heat transfer plate made of the good heat conductor metal is bonded and fixed to the heat receiving surface of the heat sink body. Thus, the present invention relates to an automotive LED heat sink (hereinafter also referred to as “LED heat sink”), which has a heat receiving surface and is bonded and fixed to the heat receiving surface portion of the heat sink body by insert molding.
Here, the carbon fiber used as a filler for the thermal-conductive resin has a thermal conductivity of 500~1,200W / m · K, graphite is preferably a thermal conductivity of 800~1,700W / m · K .

According to the heat sink for LED of the present invention as described above, at least a good heat conductor metal heat transfer plate and a heat sink body formed of a heat conductive resin are combined, and the heat conductive resin is composed of a thermoplastic resin as a matrix component. And a heat-receiving surface portion of the heat sink body using a heat conductivity of 2.5 W / m · K or more and a specific gravity of 1.3 to 1.6 containing at least one filler selected from carbon fiber and graphite. since the heat receiving surface for bonding the LED module provided with the heat transfer plate along, while maintaining heat conductivity and dissipation, and the good heat conductor metal than the specific gravity is less thermally conductive resin Since it is used, the whole can be lighter than that made of aluminum. Here, since the heat conductive resin contains a thermoplastic resin as a matrix component and contains at least one filler selected from carbon fiber and graphite, the thermal conductivity is suppressed while suppressing an increase in material cost. Can be increased.
Generally, heat conductive resin is inferior in heat conductivity to aluminum, but has low heat capacity, high emissivity, etc., and is equivalent to aluminum depending on environmental conditions such as an environment without forced air cooling such as a cooling fan. This shows the heat dissipation characteristics.

In addition, the heat sink structure for the LED is molded with the heat conductive resin , and a heat transfer plate made of the good heat conductor metal is formed on the heat receiving surface portion of the heat sink body in which a plurality of fins are arranged on the heat receiving surface portion. By insert molding , manufacturing is relatively easy.
Then, after heat from a narrow heat source such as a high-intensity LED is dispersed to the surroundings using a heat transfer plate made of a good heat conductive metal , a heat conductive resin fin with good heat dissipation and small heat capacity It is possible to efficiently dissipate heat. In particular, the heat resistance of the joint surface between the good heat conductor metal and the resin can also be reduced by insert molding a heat transfer plate made of the good heat conductor metal at the time of forming the heat conductive resin.

  Then, if an automotive LED headlamp or LED fog lamp is constructed using the aforementioned LED heat sink and a high-intensity LED module bonded to the heat receiving surface, the weight of the headlamp or fog lamp, and hence the weight of the automobile can be reduced. Can lead to improved fuel economy.

The typical embodiment of the heat sink for LED which concerns on this invention is shown, (a) is sectional drawing, (b) is a perspective view. The other embodiment of the heat sink for LED which concerns on this invention is shown, (a) is sectional drawing, (b) is a perspective view. It is a perspective view of the heat sink main body shape | molded with the heat conductive resin. It is a perspective view of the heat sink test body with which it uses for the experiment for confirming the effect of this invention. It is the graph which showed the cooling effect of each heat sink test body, resin A + Al board is shown as a solid line, resin B + Al board is shown with a dashed line, resin C + Al board is shown with a two-dot chain line, Al + Al board is shown with a thick dotted line, and only the Al board is shown with a thin dotted line Yes. It is a perspective view which shows the experiment arrangement | positioning for testing a LED cooling effect.

  Next, the present invention will be described in more detail based on the embodiments shown in the accompanying drawings. 1 to 5 show an embodiment of an LED heat sink of the present invention, in which reference numeral 1 denotes a heat sink, 2 denotes a heat sink body, 3 denotes a heat transfer plate, and 4 denotes an LED module.

The LED heat sink 1 of the present invention is a heat sink used for cooling the high-intensity LED module 4 of 1 W or more, and at least a good heat conductor metal (heat transfer plate 3) and a heat conductive resin (heat sink body 2). ) Is a basic configuration. As shown in FIGS. 1 and 2, the heat sink 1 of the present invention has a narrow heat generation of the LED module 4 by a heat transfer plate 3 made of a good heat conductor metal provided along a heat receiving surface 5 to which the LED module 4 is joined. The heat generated from the source is transmitted to the entire heat receiving surface 5, and the heat is dissipated into the air by the heat sink body 2 formed from the heat conductive resin having a low heat capacity and high emissivity, thereby suppressing the temperature rise of the LED module 4. That is, it cools.

The thermally conductive resin is a resin having a thermal conductivity of 0.5 W / m · K or more, which contains a thermoplastic resin as a matrix component and contains one or more fillers selected from carbon fibers and graphite. A thermoplastic resin is used as a matrix component from the viewpoint of moldability and recyclability . More preferably, the heat conductivity of the heat conductive resin is 2.5 W / m · K or more.

Here, it is known that the carbon fiber has a thermal conductivity of 500 to 1,200 W / m · K. Graphite has the second highest heat conductivity after diamond, and is 800 to 1,700 W / m · K, and can further increase the heat conductivity of the heat conductive resin. Of course, the thermal conductivity of the thermally conductive resin does not exceed the thermal conductivity of graphite. The measurement of thermal conductivity is based on the thermal diffusivity, specific heat, and thermal conductivity test method by the laser flash method of JIS R1161 (1997).

  Here, as the thermoplastic resin, polyolefin resin, polyamide resin, elastomer (styrene, olefin, PVC, urethane, ester, amide) resin, acrylic resin, polyester resin, engineering plastic Etc. are used. Especially polyethylene, polypropylene, nylon resin, ABS resin, acrylic resin, ethylene acrylate resin, ethylene vinyl acetate resin, polystyrene resin, polyphenylene sulfide resin, polycarbonate resin, polyester elastomer resin, polyamide elastomer resin, liquid crystal polymer, polybutylene terephthalate resin, etc. To be elected. Among them, nylon resin, polyester elastomer resin, polyamide elastomer resin, ABS resin, polypropylene resin, polyphenylene sulfide resin, liquid crystal polymer, and polybutylene terephthalate resin are preferable because of heat resistance and flexibility.

On the other hand, the good heat conductor metal is selected from materials having a thermal conductivity of 20 W / m · K or more, such as aluminum, magnesium and alloys thereof, that is, aluminum alloys and magnesium alloys . Here, the thermal conductivity is 237 W / m · K for aluminum and 156 W / m · K for magnesium .

In order to reduce the weight of the heat sink 1, the heat conductive resin having a specific gravity smaller than that of the good heat conductor metal is used. When the heat transfer plate 3 is made of aluminum or an alloy thereof, the specific gravity of aluminum is about 2.7. Therefore, the heat conductive resin having a specific gravity of 1.3 to 1.6 is used.
Further, since the specific gravity of magnesium is about 2/3 that of aluminum, which is the lightest among metals, it is advantageous to reduce the weight when the heat transfer plate 3 is made of magnesium or an alloy thereof.

The shape of the heat conductive resin part of the heat sink in the present invention may be any shape including the plate shape as long as it has an area required for the heat dissipation required for cooling the LED to the target temperature. However, it is desirable to provide fins for efficient heat dissipation. The fin shape of the heat sink is not necessarily a plate shape, and any shape such as a columnar fin can be used. The heat sink 1 shown in Figure 1, molded in the thermally conductive resin, a plurality of fins 6 to the heat receiving surface section, ... when molding the heat sink body 2 arrayed shape, and along said receiving hot surface portion The heat transfer plate 3 made of a good heat conductor metal is insert-molded to form a heat receiving surface 5. By insert molding, the interface between the heat transfer plate 3 and the heat conductive resin can be brought into close contact with each other, and the thermal resistance can be greatly reduced. The LED module 4 has a structure in which a plurality of LED elements are built in a central portion of the substrate 7 and a light emitter 8 integrally formed with a lens is held. The substrate 7 is attached to the heat receiving surface 5 of the heat sink 1. The heat transfer plate 3 is used after being joined. The mounting location of the substrate 7 is preferably bonded to the central portion for the purpose of more efficiently spreading heat over the entire heat transfer plate 3, but the bonding location is a heat transfer plate depending on the purpose of use, design, etc. Any place within 3 is acceptable. In order to join the substrate 7 of the LED module 4 to the heat receiving surface 5, a device for lowering the thermal resistance using an oil compound, RTV rubber, a heat conductive sheet, or the like is applied. As described above, the high-intensity LED module 4 is joined to the heat receiving surface 5 of the heat sink 1 to constitute an automotive LED headlamp.

The heat sink 1 shown in FIG. 2, molded in the thermally conductive resin, a plurality of fins 6 to the heat receiving surface section, ... to receiving heat surface of the heat sink main body 2 of the arrayed shape, the good heat conductor metal A heat transfer plate 3 is joined and fixed to form a heat receiving surface 5. Here, the heat resistance body 2 and the heat transfer plate 3 are also joined to reduce the thermal resistance. In this case, the heat sink body 2 and the heat transfer plate 3 are manufactured separately, so that the manufacture is easy. The heat receiving surface 5 of the heat sink 1 is actually the surface of the heat transfer plate 3, but in this case, the portion where the plate-like portion (heat receiving surface portion) of the heat sink body 2 and the heat transfer plate 3 are joined and integrated is broadly defined. The heat receiving surface 5 is used.

  Here, FIG. 1 and FIG. 2 exemplify the case where the heat receiving surface 5 of the heat sink 1 is a flat surface, but it may be cylindrical, and in the case of FIG. In the case of FIG. 2, a cylindrical heat transfer plate 3 is inserted into a cylindrical portion formed in the heat sink body 2 and joined.

A comparative experiment was performed to confirm the performance of the heat sink 1 of the present invention. The heat conductive resin A used here is an example, Eleserve EN1000 (manufactured by Starlite Industry Co., Ltd.), the heat conductive resin B is a reference example, and 30 weight ratio of polyphenylene sulfide resin (PPS) / magnesium carbonate. / 70. As a comparative thermal conductive resin C, a commercially available PPS / CF CZ1030 (manufactured by DIC Corporation) was used.

Thermally conductive resin A (Eleserve EN1000) is a thermally conductive resin in which PA12 is used as a matrix and carbon fiber is mainly blended, and has a specific gravity of 1.6 and a thermal conductivity of 3.8 W / m · K.
The heat conductive resin B has a specific gravity of 2.2 and a heat conductivity of 1.3 W / m · K. The heat conductive resin C has a specific gravity of 1.4 and a heat conductivity of about 0.7 W / m · K.

  A heat sink body 10 having a general shape as shown in FIG. 3 was molded using these heat conductive resins A to C. The dimensions of the heat sink body 10 are such that the heat receiving surface 11 is 45 mm × 30 mm, the height of the fins 12 is 20 mm, and the number of fins 12 is eight. For comparison, an aluminum heat sink body (material: A6061) having the same shape as the heat sink body 10 was prepared. In the experiment, as shown in FIG. 3, two heat sink bodies 10, 10 joined so that the fins 12, 12 are arranged in a straight line are used as a heat sink test body, and 70 mm × 70 mm across both heat receiving surfaces 11, 11. A heat transfer plate 13 made of aluminum (material: A1015) having a thickness of 3 mm was bonded with a heat conductive double-sided tape, and an LED module (not shown) was bonded to the center of the heat transfer plate 13. The same applies to the heat sink specimen made of aluminum. In the LED module, the mounted LED is MCE4WT-A2-WC-M (XL Corporation from CREE), which is mounted on a board module (L-MCE-X1 (LED-ON Corporation)) having a side of 22 mm.

  Then, as shown in FIG. 4, the four test specimens are placed on the flat sheet 14 of PA66, and a current of 650 mA is supplied from the constant current power source to the LED modules of the respective test specimens. The temperature change of the LED module was measured. The temperature was measured by attaching a thermocouple to the substrate module in the vicinity of the mounted LED. The measurement results are shown in FIG. In the figure, “resin A + Al plate” is obtained by joining a heat transfer plate 13 made of aluminum to a heat sink body 10 of heat conductive resin A, and “resin B + Al plate” is made of aluminum on a heat sink body 10 of heat conductive resin B. “Resin C + Al plate” is a heat-conductive resin C heat sink body 10 joined to an aluminum heat-transfer plate 13, and “Al + Al plate” is an aluminum heat sink body. 10 are joined with an aluminum heat transfer plate 13 joined thereto. Further, as a comparison, the one using only the aluminum heat transfer plate 13 is represented as “Al plate only”.

  From FIG. 5, the heat sink made of aluminum (thick dotted line) shows the least increase in temperature, but the heat sink of the heat conductive resin A of the present invention (solid line) also has a cooling effect comparable to that. In addition, although the cooling performance is slightly lowered, the heat sink (one-dot chain line) of the heat conductive resin B also has a sufficient cooling effect. On the other hand, the heat sink (two-dot chain line) of the general heat conductive resin C was inferior in the cooling effect. In the case of only the aluminum plate (thin dotted line) shown for reference, it was found that the cooling effect was inferior. In other words, it has been clearly understood that the heat dissipation performance is improved and the cooling effect tends to be enhanced by joining a heat conductive resin heat sink to the aluminum heat transfer plate.

  In order to compare the LED cooling effect by the fixing method of the good heat conductor metal 3 in the present invention, an experiment was conducted using the heat conductive resin A as the heat sink body 10.

  As shown in FIG. 6, in the heat sink body 10 having the same shape as that of the first embodiment, an aluminum plate (heat transfer plate 3) inserted and molded in a mold at the time of heat sink molding is used. A thermocouple was attached to the substrate 7 and the heat sink body 10 in the vicinity of the light emitter 8, and the temperature was compared with that obtained by bonding an aluminum plate after heat sink molding.

  A current of 650 mA is supplied from the constant current power source to the LED module, and the measured temperatures at the temperature measurement point X and the temperature measurement point Y after 30 minutes are shown in Table 1. Table 1 also shows the temperature difference (XY) between the temperature measurement point X and the temperature measurement point Y.

  When the aluminum plate is joined after forming from Table 1, the temperature difference (XY) is 14 ° C, but when the aluminum plate is insert-molded, the temperature difference (XY) is 8 ° C, insert molding. It can be seen that the cooling effect tends to be higher than the smaller temperature difference.

DESCRIPTION OF SYMBOLS 1 Heat sink 2 Heat sink main body 3 Heat transfer board 4 LED module 5 Heat receiving surface 6 Fin 7 Substrate 8 Light emitter 10 Heat sink body 11 Heat receiving surface 12 Fin 13 Heat transfer plate 14 Plane sheet 15 Temperature measurement point X
16 Temperature measurement point Y

Claims (2)

  1. A heat sink for an automobile LED used for cooling a high-brightness LED module of 1 W or more, which is a combination of a heat transfer plate made of a good heat conductor metal and a heat sink body formed of a heat conductive resin, The resin has a specific gravity of 1.3 to 1.6 at a thermal conductivity of 2.5 W / m · K or more, which contains a thermoplastic resin as a matrix component and contains a filler consisting of at least one selected from carbon fibers and graphite. A heat sink for an automobile LED that is provided with the heat transfer plate along the heat receiving surface portion of the heat sink body to join the LED module, and the good heat conductor metal is aluminum, or It is made of magnesium or an alloy thereof, and is selected from materials having a thermal conductivity of 20 W / m · K or more. Sink body is a shape that is arrayed a plurality of fins on the opposite position to the heat receiving surface of the heat receiving surface of the heat sink body with molding in the heat-conductive resin, the receiving heat surface of the heat sink body, the good A heat sink for an automotive LED, wherein a heat transfer plate made of a heat conductor metal is bonded and fixed to form a heat receiving surface, and the heat transfer plate is bonded and fixed to the heat receiving surface of the heat receiving surface portion of the heat sink body by insert molding.
  2. 2. The automobile according to claim 1, wherein the carbon fiber used as the filler of the thermally conductive resin has a thermal conductivity of 500 to 1,200 W / m · K, and graphite has a thermal conductivity of 800 to 1,700 W / m · K. LED heat sink.
JP2009212318A 2009-09-14 2009-09-14 LED heat sink for automobile Active JP5683799B2 (en)

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