TWI773548B - Car led lamp diffusion module for both heat conduction and heat diffusion - Google Patents

Abstract

A car LED lamp diffusion module for both heat conduction and heat diffusion is disclosed. The car LED lamp diffusion module for both heat conduction and heat diffusion includes metal shell, a heat conducting body, at least one LED lamp, a heat pipe part, a fin heat sink body and a fan. The heat conducting body is in contact with the metal shell. The at least one LED lamp is arranged on the heat conducting body. The heat pipe part is integrally formed at one end of the heat conducting body and penetrates the inner side of the metal shell. The fin heat sink body is in contact with the heat pipe part. The fan is arranged at one end of the fin heat sink body to remove the heat energy diffused by the fin heat sink body. The heat conducting body is used for absorbing the heat energy generated by at least one LED lamp, and the heat pipe part is used for conducting the absorbed heat energy to the fin heat sink. The fin heat sink body is used for diffusing the heat energy conducted by the heat pipe part.

Description

A heat dissipation module for automotive LED lamps that takes into account both heat conduction and heat diffusion

The present invention relates to a heat dissipation module for an LED lamp, in particular to a heat dissipation module for an LED lamp for a vehicle that takes both heat conduction and heat diffusion into consideration.

Due to the advantages of high luminous efficiency, low operating voltage, low power consumption, and small size, light-emitting diodes (Light Emitting Diodes, LEDs) have been widely used in automotive lighting systems in recent years.

However, automotive LED lights have great heat dissipation problems. Generally speaking, about 60% of the heat generated by automotive LED lights is irreversible work. When the automotive LED lamp reaches a certain high temperature, the output power will be reduced and its service life will be reduced.

At present, the common heat dissipation module materials are mainly divided into all aluminum or all copper. Aluminum has high thermal diffusivity but low thermal conductivity, and copper has low thermal diffusivity but high thermal conductivity. Both cannot satisfy both high diffusivity and high thermal conductivity. coefficient. In other words, the heat dissipation effect of the heat dissipation module composed of a single material is limited. In addition, if a high-speed fan is used to enhance heat dissipation, a double-bearing structure or a method of thickening the bearing is required, which leads to a problem of high cost.

Therefore, how to provide a "heat dissipation module for automotive LED lamps that takes into account both heat conduction and heat diffusion" has become a problem to be solved in the industry.

An embodiment of the present invention provides a heat dissipation module for a vehicle LED lamp that takes into account both heat conduction and heat diffusion, including: a metal shell; The heat pipe part is integrally formed at one end of the heat conducting body and is inserted into the inner side of the metal shell; a fin heat sink is in contact with the heat pipe part; The heat energy diffused by the body; wherein the heat conduction body is used for absorbing the heat energy generated by at least one LED lamp, and the absorbed heat energy is conducted by the heat pipe part to the fin heat sink, and the fin heat sink body is used for dissipating the heat energy conducted by the heat pipe part.

In some embodiments, the inside of the heat pipe has a capillary structure and a working fluid. The working fluid absorbs the heat energy generated by the at least one LED lamp and assumes a gas state, and condenses back to a liquid state at the other end of the heat pipe.

In some embodiments, the appearance of the heat pipe portion presents a cylindrical structure.

In some embodiments, the thermally conductive body is a polyhedron, and each side is in direct contact with at least one LED light.

In some embodiments, the metal shell is a polyhedron having the same number of faces as the polyhedron of the thermally conductive body.

In some embodiments, the thermally conductive body is made of copper, and the finned heat sink is made of aluminum.

In some embodiments, the thermal expansion coefficient of the copper material is between 16-19 ppm/K, and the thermal expansion coefficient of the aluminum material is between 18-21 ppm/K.

In some embodiments, a bushing is further provided between the metal shell and the fin heat sink for fixing with a vehicle body lamp housing.

In some embodiments, the heat conducting body, the heat pipe portion, the fin heat sink and the fan are arranged on the same axis.

In some embodiments, at least one flexible circuit board is further disposed on the metal casing to drive at least one LED light to light up.

In order to make the present invention more obvious and easy to understand, the following specific embodiments are given and described in detail in conjunction with the accompanying drawings as follows.

The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and embodiments. The following examples are only used to more clearly illustrate the technical solutions of the present invention, but not to limit the protection scope of the present invention.

For the sake of clarity and convenience in the description of the drawings, various components in the drawings may be shown exaggerated or reduced in size and proportion. In the following description and/or claims, when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present; When "directly connected" or "directly coupled" to another element, there are no intervening elements present, and other words used to describe the relationship between elements or layers should be interpreted in the same fashion; "first," "second," etc. The ordinal numbers have no sequential relationship with each other, and are only used to identify and distinguish two different elements with the same name. For ease of understanding, the same elements in the following embodiments are denoted by the same symbols.

Please refer to FIG. 1 , which is a schematic top view of the structure of an embodiment of the present invention. As shown in FIG. 1 , the heat dissipation module 100 for a vehicle LED lamp with both heat conduction and heat diffusion includes: an LED lamp 101 , a flexible circuit board 102 , a thermally conductive body 103 , a heat pipe portion 1030 , a metal shell 104 , a bushing 105 , Fin radiator 106 and fan 107 .

The thermally conductive body 103 is in contact with the metal casing 104 . The thermally conductive body 103 is formed of a polyhedron. Each surface of the polyhedron is oriented differently. The polyhedron may be, for example, a triangle, a rectangle, a regular polygon, or the like. The appearance structure of the thermally conductive body 103 can be designed, adjusted and changed correspondingly according to the requirements of the LED lighting angle. The heat-conducting body 103 is used for absorbing the heat energy generated when the LED lamp 101 emits light or after it is extinguished. In this embodiment, the thermally conductive body 103 is a single material structure. For example, the thermally conductive body 103 is made of copper. The coefficient of thermal expansion (CTE) of the copper material is between 16-19 ppm/K.

The heat pipe portion 1030 has the same material as the thermally conductive body 103 . The heat pipe portion 1030 is integrally formed on one end of the heat conducting body 103 . The other end of the heat pipe portion 1030 is penetrated inside the metal casing 104 . The inside of the heat pipe part 1030 is a vacuum cavity, and has a capillary structure and a working fluid. The capillary structure can be, for example, mesh, groove, or fiber. The working fluid absorbs the heat energy generated by the LED lamp 101 and assumes a gas state, and condenses back to a liquid state at the other end of the heat pipe portion 1030, and then sucks back the end close to the heat conducting body 103 through the capillary structure, thereby forming a gas- fluid circulation. In some embodiments, the thermally conductive body 103 and the heat pipe portion 1030 may be non-integrated and combined with each other in a sheathing manner, for example, the thermally conductive body 103 is sheathed on one end of the heat pipe portion 1030 .

More specifically, the end of the heat pipe portion 1030 close to the heat conducting body 103 is the evaporation end, and the working fluid absorbs the heat energy generated by the LED lamp 101 and then evaporates. One end of the heat pipe portion 1030 close to the finned radiator 106 is a condensation end, and the working fluid liquefies after encountering a relatively cold area. In practice, the working fluid may be, for example, methanol, water, acetone or mercury, among others.

The metal casing 104 is formed of a polyhedron. Each surface of the polyhedron is oriented differently. The polyhedron may be, for example, a triangle, a rectangle, a regular polygon, or the like. The appearance structure of the metal casing 104 can be designed, adjusted and changed correspondingly according to the LED lighting angle requirements. The outer side of the metal casing 104 is used to carry the flexible circuit board 102 . The inner side of the metal casing 104 is used for accommodating the heat pipe part 1030 . The metal housing 104 may be, for example, an aluminum material.

The LED lamp 101 is disposed on the heat conducting body 103 . The LED lamp 101 and the flexible circuit board 102 are electrically connected to each other. The LED lamp 101 is driven by the flexible circuit board 102 to emit light. In practice, the flexible circuit board 102 may be, for example, a flexible printed circuit (Flexible Printed Circuit, FPC). In addition, the flexible circuit board 102 is fixed on the metal casing 104 through the first fixing member 202 (as shown in FIG. 3 ). The first fixing member 202 may be, for example, a screw, a rivet or the like.

Please refer to FIG. 2 and FIG. 3 together. FIG. 2 is a schematic diagram of a structural combination according to an embodiment of the present invention, and FIG. 3 is a schematic diagram of a structural combination of another viewing angle according to an embodiment of the present invention. As shown in FIG. 2 , it can be clearly seen that the thermally conductive body 103 and the metal shell 104 are polyhedral structures.

As shown in FIG. 3 , the bushing 105 is provided between the metal case 104 and the fin heat sink 106 . The bushing 105 is used for fixing with a vehicle body lamp housing. In addition, the bushing 105 has high temperature resistance properties. In some embodiments, the bushing 105 may also be omitted.

One end of the fin heat sink 106 is in contact with the heat pipe portion 1030 . The fin heat sink 106 is used for dissipating the heat energy conducted by the heat pipe portion 1030 . The other end of the fin heat sink 106 is in contact with the fan 107 . The overall appearance of the fin heat sink 106 is generally formed of a radial circle. In some implementations, the appearance of the fin heat sink 106 may also be formed by a radial triangle, a quadrangle or a polygon. The fin heat sink 106 is made of aluminum. The thermal expansion coefficient of the aluminum material is between 18 and 21 ppm/K.

Please refer to FIG. 4 , which is a schematic exploded view of the structure of an embodiment of the present invention. As shown in FIG. 4 , when viewed from the Z-axis direction, the thermally conductive body 103 has an external shape similar to that of the metal case 104 .

The thermally conductive body 103 is in direct contact with the LED lamp 101 (as shown in FIG. 1 ). The thermally conductive body 103 is used for absorbing the thermal energy generated by the LED lamp 101 . Since the thermally conductive body 103 is in direct contact with the LED lamp 101 , the thermal energy generated by the LED lamp 101 can be quickly absorbed. In some embodiments, between the contact surfaces of the thermally conductive body 103 and the LED lamp 101 , a heat-dissipating adhesive with low thermal resistance can be filled to reduce the interface thermal resistance and improve the heat-dissipation efficiency.

The appearance of the heat pipe portion 1030 is substantially cylindrical. The thermally conductive body 103 is in contact with the heat pipe portion 1030 . The heat pipe portion 1030 is used for conducting the thermal energy absorbed by the thermally conductive body 103 to the fin heat sink 106 .

The appearance and structure of the thermally conductive body 103 can be designed and changed according to the quantity and lighting angle of the LED lamps 101 , so as to be installed with different quantities of the LED lamps 101 , so as to achieve the goal of energy saving and heat dissipation.

It should be noted that the heat pipe portion 1030 and the fin heat sink 106 have different thermal expansion coefficients. However, since the thermal expansion coefficients of the two are not much different, the size of the contact portion of the heat pipe portion 1030 and the fin heat sink 106 can be increased so that the heat pipe portion 1030 and the fin heat sink 106 can be closely matched. In some embodiments, between the contact surface of the heat pipe portion 1030 and the fin heat sink 106 , a heat dissipation glue with low thermal resistance can be filled to reduce the interface thermal resistance and improve the heat dissipation efficiency.

The fan 107 is disposed at one end of the fin heat sink 106 . The fan 107 includes blades 1070 and a fan casing 1072 . The fan 107 utilizes forced convection to speed up the heat diffusion of the fin heat sink 106 and is used to remove the heat energy diffused by the fin heat sink 106 . In this way, the fan 107 can shorten the heat dissipation time, reduce the accumulation of heat, and can also improve the performance and life of the LED lamp 101 . In practice, the fan 107 may be, for example, an axial fan. In addition, the fan 107 can be locked on the fin heat sink 106 through a second fixing member (shown in the figure). The second fixing member may be, for example, a screw, a rivet, or the like.

In this embodiment, the thermally conductive body 103 , the heat pipe portion 1030 , the finned heat sink 106 and the fan 107 are disposed on the same axis (eg, Z axis). In this way, the convection generated by the fan 107 can quickly and effectively remove the heat energy generated by the LED lamp 101 , and with the combined structure of the heat conducting body 103 , the heat pipe portion 1030 and the fin heat sink 106 , the heat energy generated by the LED lamp 101 can be quickly absorbed and conduct heat. , diffusion and exclusion.

Please refer to FIG. 5 , which is an exploded schematic diagram of another embodiment of the present invention. As shown in FIG. 5 , when viewed from the Z-axis direction, the thermally conductive body 103 has an external shape similar to that of the metal case 104 . The difference between the embodiment in FIG. 5 and the embodiment in FIG. 4 is that the thermally conductive body 103 and the heat pipe portion 1030 in the embodiment in FIG. 5 are integrally formed, and other structures are the same, and will not be repeated here.

Due to the structure of the heat conducting body 103 and the heat pipe part 1030 being integrally formed. Therefore, there is no problem of heat transfer interface between the thermally conductive body 103 and the heat pipe portion 1030 . In this embodiment, the integrally formed structure may be processed by extrusion or forging.

Next, please refer to FIG. 6 , which is a graph of experimental data of heat dissipation temperature variation according to the embodiment of the present invention and the prior art. As shown in Fig. 6, the horizontal axis is time, and the vertical axis is temperature. The conventional technology (marked by the dotted line) uses a single material (eg, all-copper or all-aluminum) heat dissipation module, and its heat dissipation structure is different from that of the embodiment of the present invention (marked by the solid line). At 90 seconds, the temperature of the vehicle LED lamp of the prior art is about 58°C, while the temperature of the vehicle LED lamp of the embodiment of the present invention is about 52°C. At 210 seconds, the temperature of the conventional vehicle LED lamp is about 67°C, while the vehicle LED lamp of the embodiment of the present invention reaches an equilibrium temperature of about 60°C. At 270 seconds, the temperature of the vehicle LED lamp of the prior art is about 69°C, while the temperature of the vehicle LED lamp of the embodiment of the present invention is about 60°C. At 390 seconds, the prior art automotive LED light reached an equilibrium temperature of about 71°C. From the experimental results, it can be known that the vehicle LED lamp with both heat conduction and heat diffusion according to the embodiment of the present invention can achieve the heat dissipation target more quickly and at the same time have a lower saturation temperature. Compared with the prior art, the heat dissipation efficiency of the embodiment of the present invention is improved by about 15%.

To sum up, the heat dissipation module for vehicle LED lamps of the present invention, which takes both heat conduction and heat diffusion into consideration, utilizes the integrated columnar heat conductor to reduce the problem of heat transfer interface and thermal resistance. In addition, since the columnar heat conductor made of copper has good thermal conductivity, and the finned heat sink made of aluminum has good thermal diffusivity, with the built-in fan design, it can quickly and effectively eliminate the heat generated by LED lights. thermal energy.

According to the embodiment of the present invention, the columnar heat conductor can adopt an integral molding structure. In addition to reducing the thermal conversion interface and thermal resistance, the columnar heat conductor is in direct contact with the LED lamp, so it can quickly absorb the generation of the LED lamp. The heat energy is guided to the fin heat sink and the fan to remove the heat energy.

According to another embodiment of the present invention, the columnar heat conducting body adopts a non-integrated molding structure, which is convenient in manufacture and processing, and can relatively reduce the manufacturing cost of the composite material heat dissipation module of the vehicle LED lamp.

The fin heat sink according to the embodiment of the present invention has a groove structure for accommodating a fan. In this way, the volume of the composite material heat dissipation module of the vehicle LED lamp can be reduced, which conforms to the design trend of light, thin and short.

Although the present invention has been disclosed above by the embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the scope of the appended patent application.

100: Heat dissipation module for automotive LED lamps that takes into account both heat conduction and heat diffusion 101: LED lights 102: Flexible circuit board 103: Thermal body 1030: Heat Pipe Department 104: Metal shell 105: Bushing 106: Fin heat sink 107: Fan 1070: Blade 1072: Fan Housing 202: First Fixture

FIG. 1 is a schematic top view of the structure of an embodiment of the present invention. FIG. 2 is a schematic diagram of a structural combination according to an embodiment of the present invention. FIG. 3 is a schematic diagram of another viewing angle structure combination according to an embodiment of the present invention. FIG. 4 is a schematic exploded view of the structure of an embodiment of the present invention. FIG. 5 is a schematic exploded view of the structure of another embodiment of the present invention. FIG. 6 is an experimental data diagram of the variation of heat dissipation temperature according to the embodiment of the present invention and the prior art.

100: Heat dissipation module for automotive LED lamps that takes into account both heat conduction and heat diffusion

101: LED lights

102: Flexible circuit board

103: Thermal body

1030: Heat Pipe Department

104: Metal shell

105: Bushing

106: Fin heat sink

107: Fan

1070: Blade

1072: Fan Housing

Claims (9)

A heat dissipation module for a vehicle LED lamp that takes into account both heat conduction and heat diffusion, comprising: a metal shell; It is integrally formed on one end of the heat-conducting body and passes through the inner side of the metal shell; a finned radiator is in contact with the heat pipe; and a fan is arranged on one end of the finned radiator to remove the fins The heat energy diffused by the fin heat sink; wherein the thermally conductive body is a polyhedron, and each side is in direct contact with the at least one LED lamp, so as to absorb the heat energy generated by the at least one LED lamp and conduct the absorbed heat energy by the heat pipe portion to the fin heat sink, and the fin heat sink is used for dispersing the heat energy conducted by the heat pipe portion. As claimed in claim 1, the heat dissipation module for a vehicle LED lamp with both heat conduction and heat diffusion, wherein the heat pipe portion has a capillary structure and a working fluid inside, and the working fluid absorbs the heat energy generated by the at least one LED lamp and presents a gas state, and condenses back to a liquid state at the other end of the heat pipe. The heat dissipation module for a vehicle LED lamp with both heat conduction and heat diffusion as claimed in claim 1, wherein the appearance of the heat pipe portion presents a cylindrical structure. The heat dissipation module for a vehicle LED lamp with both heat conduction and heat diffusion as claimed in claim 1, wherein the metal shell is a polyhedron having the same number of faces as the polyhedron of the thermally conductive body. The heat dissipation module for a vehicle LED lamp with both thermal conduction and heat diffusion as claimed in claim 1, wherein the thermally conductive body is made of copper, and the fin heat sink is made of aluminum. The heat dissipation module for automotive LED lamps with both thermal conduction and thermal diffusion as claimed in claim 5, wherein the thermal expansion coefficient of the copper material is between 16 and 19 ppm/K, and the thermal expansion coefficient of the aluminum material is between 18 and 21 ppm. /K. As claimed in claim 1, the heat dissipation module for a vehicle LED lamp with both heat conduction and heat diffusion is provided, wherein a bushing is further arranged between the metal casing and the fin heat sink for fixing with a vehicle body lamp casing . The heat dissipation module for a vehicle LED lamp with both heat conduction and heat diffusion as claimed in claim 1, wherein the heat conducting body, the heat pipe portion, the fin heat sink and the fan are disposed on the same axis. The heat dissipation module for a vehicle LED lamp with both heat conduction and heat diffusion as claimed in claim 1, wherein at least one flexible circuit board is further disposed on the metal casing to drive the at least one LED lamp to light up.

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