WO2013097146A1

WO2013097146A1 - Flat plate water-cooled heat dispersion apparatus

Info

Publication number: WO2013097146A1
Application number: PCT/CN2011/084923
Authority: WO
Inventors: 陈思远; 纪科星; 李立伟; 张亮; 卢雄伟
Original assignee: 联合汽车电子有限公司
Priority date: 2011-12-26
Filing date: 2011-12-29
Publication date: 2013-07-04
Also published as: CN102563998A

Abstract

Disclosed is a flat plate water-cooled heat dispersion apparatus, comprising an upper cold plate (11) and a lower cold plate (12), the top face (11a) of the upper cold plate (11) and/or the bottom face (12a) of the lower cold plate (12) contacting an exothermic device, wherein bosses protruding downwards (110) are provided on the bottom face (11b) of the upper cold plate (11), bosses protruding upwards (120) are provided on the top face (12b) of the lower cold plate (12), with the bosses protruding downwards (110) on the bottom face of the upper cold plate and the bosses protruding upwards (120) on the top face of the lower cold plate being staggered against each other; and a flow channel (20) is formed between the bottom face of the upper cold plate and the top face of the lower cold plate, the coolant flowing within the flow channel, such that heat can be taken away from the upper cold plate (11) and the lower cold plate (12). The flat plate water-cooled heat dispersion apparatus can reduce production costs and production difficulties, and can improve heat dispersion performance.

Description

Flat water cooling device

Technical field

The present invention relates to a device for dissipating heat using a coolant such as water.

Background technique

Please refer to FIG. 1a, which is a schematic longitudinal cross-sectional view of a conventional flat water-cooling heat sink. Figure 1b is a cross-sectional view taken along line A-A of Figure 1a, i.e., a transverse cross-sectional view of the flat water-cooling heat sink. The water-cooling heat dissipating device 10 includes an upper cold plate 11 and a lower cold plate 12, preferably made of a metal material, and the upper cold plate 11 and the lower cold plate 12 are sealingly joined to each other on the left and right sides in FIG. The top surface 11a of the upper cold plate 11 and the bottom surface 12b of the lower cold plate 12 are flat plates for contacting the heat generating device. On the bottom surface 11b of the upper cold plate 11, there are a plurality of downwardly projecting platforms 110, and the top surface 12a of the lower cold plates 12 is a flat plate, and a cavity is formed between them to be referred to as a flow path 20. The coolant flows in the flow path 20, thereby taking away the heat of the upper cold plate 11 and the lower cold plate 12.

The flat water-cooling heat dissipating device can be placed on one side or both sides (ie, the upper cold plate top surface 11a and/or the lower cold plate bottom surface 12b), for example, in the field of new energy vehicles. In the new energy vehicle, the inverter (Inverter) and the DC-DC converter module of the controller have a large amount of heat, and are usually disposed on both sides of the flat water-cooling heat dissipating device 10, and the heat is radiated to the upper cold plate. 11 and / or lower cold plate 12. The coolant having a lower temperature enters from the inlet of the flow passage, exchanges heat with the upper cold plate 11 and the lower cold plate 12 in the flow passage 20, absorbs heat, and the temperature rises, and the coolant that absorbs heat flows out from the outlet of the flow passage. This cycle, the cooling of the controller is achieved. The flat water-cooling heat sink described above can also be used for heat dissipation of a battery module of a new energy vehicle.

In the flat water-cooling heat dissipating device 10, the lower bottom surface of the upper cold plate may have a columnar shape or a table shape. The columnar shape is preferably a cylinder, an elliptical cylinder or the like; the table shape is preferably a circular table, an elliptical table or the like; and its smooth side wall is advantageous for reducing the resistance of the coolant flow. The columnar lower boss 110 is usually completed by an extrusion process. Since the upper cold plate 11 and the lower cold plate 12 are generally made of an aluminum alloy material which is inexpensive and has good heat conductivity, it is difficult to press and the process cost is high. The table-shaped lower boss 110 is usually fabricated by a die-casting process, and has a lower cost and is therefore more widely used. However, the side wall of the table-like lower boss 110 and the upper cold plate bottom surface 11b have a certain inclination angle (non-perpendicular), and the greater the inclination, the larger the flow passage area of the flow path 20.

Referring to FIG. 1a, it is found that during the actual use of the flat water-cooling heat dissipating device 10, the cooling liquid flows from the end portion 110b of the lower bottom surface of the upper cold plate to the bottom portion 110b, and hardly flows through the root portion 110a. It affects its heat dissipation performance.

In order to improve the heat dissipation performance of the flat water-cooling heat dissipating device 10, one method is to increase the distribution density of the lower boss 110 on the bottom surface 11b of the upper cold plate, but this poses a higher challenge to the manufacturing process. How to improve the heat dissipation performance without increasing the manufacturing cost; or to reduce the manufacturing cost under the premise of ensuring the same heat dissipation capability, it becomes an important issue to be solved in a flat water cooling device.

technical problem

The technical problem to be solved by the present invention is to provide a flat water-cooling heat dissipating device which has a better heat dissipating effect and which does not become complicated in the manufacturing process.

Technical solution

In order to solve the above technical problem, the flat water-cooling heat dissipating device of the present invention comprises an upper cold plate and a lower cold plate, the top surface of the upper cold plate and/or the bottom surface of the lower cold plate are in contact with the heat generating device; and the bottom surface of the upper cold plate has a plurality of directions The lower raised platform has a plurality of upwardly convex platforms on the top surface of the lower cold plate, and the lower bottom plate of the upper cold plate and the upper surface of the lower cold plate are staggered with each other; the bottom plate of the upper cold plate and the lower cold plate A flow path is formed between the top surfaces, and the coolant flows in the flow path to take away the heat of the upper and lower cold plates.

Beneficial effect

The flat water-cooling heat dissipating device of the invention can reduce the manufacturing cost and the manufacturing difficulty without reducing the overall heat dissipating capacity, for example, the distribution density of the lower bosses on the bottom surface of the upper cold plate can be reduced, thereby reducing the manufacturing cost and the manufacturing difficulty, but increasing The boss on the top of the lower cold plate compensates for the loss of heat dissipation. The flat water-cooling heat dissipating device of the invention can also increase the overall heat dissipating capacity under the premise of maintaining manufacturing cost and manufacturing difficulty, mainly because the increased boss on the top surface of the lower cold plate can be used to adjust the longitudinal cross-sectional shape of the flow channel, thereby promoting The coolant flows through the surface and the area where the heat is generated, thereby enhancing the heat dissipation performance.

DRAWINGS

Figure 1a is a schematic longitudinal cross-sectional view of a conventional flat water-cooling heat sink;

Figure 1b is a cross-sectional view taken along line A-A of Figure 1a, showing a transverse cross-sectional view of a conventional flat water-cooling heat sink;

Figure 2a is a longitudinal cross-sectional view showing a first embodiment of the flat water-cooling heat dissipating device of the present invention;

Figure 2b is a cross-sectional view taken along line A-A of Figure 2a, that is, a schematic cross-sectional view of the flat water-cooling heat sink of the present invention;

Figure 2c is a cross-sectional view taken along line A-A of Figure 2a, that is, a schematic cross-sectional view of the flat water-cooling heat sink of the present invention;

Figure 3 is a longitudinal cross-sectional view showing a second embodiment of the flat water-cooling heat dissipating device of the present invention;

Figure 4 is a longitudinal cross-sectional view showing a third embodiment of the flat water-cooling heat dissipating device of the present invention.

The reference numerals in the figure indicate:

10 The existing flat water-cooling heat dissipating device; 11 is the upper cold plate; 11a is the upper cold plate top surface; 11b is the upper cold plate bottom surface; 110 is the upper cold plate lower boss; 110a is the upper cold plate lower boss root; 110b The upper cold plate lower boss end; 12 is the lower cold plate; 20 is the flow channel; 30 is the flat water cooling device of the present invention.

Embodiments of the invention

Please refer to FIG. 2a, which is a longitudinal cross-sectional view of an embodiment of the flat water-cooling heat dissipating device of the present invention. The water-cooling heat sink 30 includes an upper cold plate 11 and a lower cold plate 12, preferably made of a metal material, and the upper cold plate 11 and the lower cold plate 12 are sealingly joined to each other on the left and right sides in FIG. The top surface 11a of the upper cold plate 11 and the bottom surface 12b of the lower cold plate 12 are flat plates for contacting the heat generating device. A plurality of downwardly projecting platforms 110 are provided on the bottom surface 11b of the upper cold plate 11, and a plurality of upwardly projecting platforms 120 are provided on the top surface 12a of the lower cold plate 12. The upper bottom plate of the upper cold plate 110 and the lower surface of the lower cold plate are mutually staggered. A cavity is formed between the upper cold plate bottom surface 11b and the lower cold plate top surface 12a as a flow path 20. The coolant flows in the flow path 20, thereby taking away the heat of the upper cold plate 11 and the lower cold plate 12.

Alternatively, the top surface 11a of the upper cold plate 11 and the bottom surface 12b of the lower cold plate 12 may not be flat plates, but may be adaptively designed according to the shape of the heat generating device.

Alternatively, the sealing joint between the upper cold plate 11 and the lower cold plate 12 is not limited to two sides, and may be arbitrarily set as long as a flow passage 20 is formed between the upper cold plate 11 and the lower cold plate 12, The flow passage 20 has an inlet and an outlet of the coolant, and the remaining portions are sealed and combined.

Compared with the existing flat water-cooling heat dissipating device 10, in the flat water-cooling heat dissipating device 30 of the present invention shown in FIG. 2a, since the lower cooling plate top surface 12a has an upper boss 120, the cooling liquid is forced to flow close to the upper cold plate. The bottom surface 11b (i.e., the side of the root portion 110a of the boss 110 below the upper cold plate bottom surface). According to the simulation of the heat generation, when the top plate 11a of the upper cold plate contacts the heat generating device, the temperature of the root portion 110a of the lower bottom plate 110 of the upper cold plate is higher than the temperature of the end portion 110b, so that the present invention can achieve better cooling and heat dissipation effect. .

Please refer to FIG. 2b, which is a cross-sectional view of the A-A direction of FIG. 2a, which is a schematic cross-sectional view of the flat water-cooling heat sink 30. Wherein, the lower bottom plate of the upper cold plate 110 is arranged in a square shape, and a boss 120 on the top surface of the lower cold plate is disposed at a center position of the lower boss 110 at the bottom surface of each of the four upper cold plates arranged in a square shape. The staggered arrangement of the lower bottom plate 110 of the upper cold plate and the upper surface of the lower cold plate is referred to as a straight line. Obviously, it is also feasible to provide an upper cold plate bottom lower boss 110 at the center of each of the four lower cold plates on the top surface of the lower cold plate.

Please refer to FIG. 2c, which is another cross-sectional view of the A-A direction of FIG. 2a, which is another transverse cross-sectional view of the flat water-cooling heat sink 30. Wherein, the lower bottom plate of the upper cold plate 110 is arranged in an equilateral triangle, and a boss 120 on the top surface of the lower cold plate is disposed at a center position of the lower boss 110 at the bottom surface of each of the upper cold plates arranged in an equilateral triangle. The staggered arrangement of the lower platform 110 of the upper cold plate and the boss 120 on the top surface of the lower cold plate is called a fork row. Obviously, it is also feasible to provide an upper cold plate bottom lower boss 110 at the center of each of the three lower cold plates on the top surface of the lower cold plate.

The arrangement of the above-mentioned two upper cold plate bottom lower bosses 110 and the lower cold plate top surface bosses 120 are mutually arranged, and any other arrangement may be adopted.

Preferably, there is a gap between the lower bottom plate 110 of each upper cold plate and the boss 120 on the top surface of the lower cold plate around the upper cold plate. In other words, the boss 120 on the top surface of each lower cold plate and the periphery thereof There is a gap between the lower bosses 110 on the bottom surface of the upper cold plate. Thus, the following three regions form a complete flow passage 20: the side surface of the lower platform 110 of the upper cold plate and the side gap of the boss 120 on the top surface of the lower cold plate, the lower platform of the upper cold plate and the lower plate 110 and the lower cold plate The gap between the surface 12a and the gap between the boss 120 on the top surface of the lower cold plate and the bottom surface 11b of the upper cold plate. The coolant can flow freely and adjust in the flow passage 20.

When there is no gap between the lower bottom plate 110 of the upper cold plate and the boss 120 on the top surface of the lower cold plate around the upper cold plate, the flow channel 20 is divided into two independent ones, that is, the lower cold plate bottom lower boss 110 and the lower The gap between the top surface 12a of the cold plate and the gap between the boss 120 on the top surface of the lower cold plate and the bottom surface 11b of the upper cold plate. The coolant can still flow in the separate two flow channels 20 but cannot be adjusted.

Preferably, the end faces of the lower bosses 110 on the bottom surface of each of the upper cold plates are lower than the end faces of the bosses 120 on the top surface of each of the lower cold plates, in other words, the end faces of the bosses 120 on the top surface of each of the lower cold plates Both are higher than the end faces of the lower bosses 110 on the bottom surface of the upper cold plate. In this way, the coolant can be lifted close to the bottom surface 11b of the upper cold plate to improve the heat dissipation performance of the upper cold plate 11.

When the end surface of the lower platform 110 of the upper cold plate is equal to or higher than the end surface of the boss 120 on the top surface of the lower cold plate, the cooling liquid is lifted to be close to the flat lower plate top surface 12a. The effect of the bottom surface 11b of the cold plate, but the effect is not as obvious as when the end surface of the lower boss 110 on the bottom surface of the upper cold plate is lower than the end surface of the boss 120 on the top surface of the lower cold plate.

In the flat water-cooling heat dissipating device 30 shown in FIG. 2a, the gap between the end surface of the lower cold plate 110 and the lower cold plate top surface 12a is small, and the end surface of the boss 120 on the top surface of the lower cold plate is upper and upper. The gap between the cold plate bottom faces 11b is large. Therefore, after the cooling liquid is filled with a small gap between the end surface of the lower platform 110 and the lower cold plate top surface 12a, the cooling liquid is forced to be raised to the end surface of the boss 120 and the upper cold plate on the top surface of the lower cold plate. The flow between the bottom surfaces 11b is suitable for the case where the upper cold plate top surface 11a is in contact with a heat generating device having a large amount of heat. Similarly, if it is known that the lower cold plate bottom surface 12b is in contact with the heat generating device having a large amount of heat generation, the gap between the end surface of the lower cold plate upper boss 110 and the lower cold plate top surface 12a can be made larger, and the lower cold plate top can be made larger. The gap between the end surface of the upper boss 120 and the upper cold plate bottom surface 11b becomes smaller, so that the coolant flows more through the lower cold plate top surface 12a, thereby facilitating heat dissipation of the lower cold plate 12.

FIG. 3 shows another embodiment of the flat water-cooling heat dissipating device of the present invention, wherein the gap between the end surface of the upper bottom plate of the cold plate and the lower surface of the lower cold plate 12a is larger, and the upper surface of the lower cold plate is raised. The gap between the end face of 120 and the upper cold plate bottom surface 11b is also large, for example, the two gaps are substantially the same height. Therefore, a part of the cooling liquid flows in a large gap between the end surface of the lower bottom plate 110 and the lower cold plate top surface 12a of the upper cold plate, and another part of the cooling liquid will be on the end surface of the boss 120 on the top surface of the lower cold plate. The flow in the large gap between the upper cold plate bottom surface 11b is suitable for the case where the upper cold plate top surface 11a and the lower cold plate bottom surface 12b are simultaneously in contact with the heat generating device having a large amount of heat generation.

In the flat water-cooling heat dissipating device 30 shown in FIG. 2a and FIG. 3, all the lower cooling plate bottom lower bosses 110 have the same height, and all the lower cold plate top surface bosses 120 are also at the same height, which is suitable for the upper cold plate. The heat generating device in contact with the top surface 11a and/or the lower cold plate bottom surface 12b has a relatively uniform heat generation in each region.

Fig. 4 shows still another embodiment of the flat water-cooling heat dissipating device of the present invention, wherein the height of the boss 120 on the top surface of the lower cold plate in the middle region is smaller than the height of the boss 120 on the top surface of the lower cold plate in the peripheral region. Thus, the coolant flows more between the boss 120 on the top surface of the lower cold plate of the intermediate portion and the bottom surface 11b of the upper cold plate, thereby further facilitating heat dissipation in the intermediate portion of the upper cold plate 11. This applies to the case where the heat generating device in contact with the top plate 11a of the upper cold plate has a heat generation amount in the intermediate portion larger than that in the peripheral portion. Similarly, if it is known that some areas of the heat-generating device have a larger amount of heat generation, the height of the boss can be adjusted in the cold plate area in contact with it, so that the coolant flows more through the area to more favor the area. Partial heat dissipation.

In the flat water-cooling heat dissipating device 30 of the present invention, the lower base plate lower boss 110 and the lower cold plate top surface boss 120 may be columnar or table-shaped, preferably cylindrical with a smooth side wall, an elliptical cylinder or the like. As shown in Fig. 2a; or a truncated cone, elliptical or the like having a smooth side wall, as shown in Figs. 3 and 4; its smooth side wall is advantageous for reducing the resistance when the coolant flows. The boss structure is also referred to as a pin fin, and the entire flat water cooling device is also referred to as a pin fin water cooling device.

In summary, the flat water-cooling heat dissipating device of the present invention is provided with a lower boss on the bottom surface of the upper cold plate, and an upper boss on the top surface of the lower cold plate, and the lower bottom plate of the upper cold plate and the lower surface of the lower cold plate are convex. The stations are staggered. The cooling liquid is in the side gap of the boss on the bottom surface of the upper cold plate and the top surface of the lower cold plate, the gap between the lower bottom plate of the upper cold plate and the top surface of the lower cold plate, and the upper surface of the lower cold plate Flows in the gap with the bottom surface of the upper cold plate. In the case where the upper cold plate contacts the heat generating device with large heat generation, the gap between the boss on the top surface of the lower cold plate and the bottom surface of the upper cold plate is increased, and the gap between the lower boss of the upper cold plate and the top surface of the lower cold plate is reduced. Allow more coolant to flow through the bottom surface of the upper cold plate. In the case where the lower cold plate contacts the heat generating device with large heat generation, the gap between the lower convex plate and the lower cold plate top surface of the upper cold plate is increased, and the gap between the convex plate on the top surface of the lower cold plate and the bottom surface of the upper cold plate is reduced. Allow more coolant to flow through the top of the lower cold plate. For the case where the upper cold plate and the lower cold plate are in contact with the heat generating device with large heat generation, the gap between the boss on the top surface of the lower cold plate and the bottom surface of the upper cold plate is increased, and the lower bottom plate and the lower cold plate top of the upper cold plate are increased. The gap between the faces causes a portion of the coolant to flow through the bottom surface of the upper cold plate, and another portion of the coolant flows through the top surface of the lower cold plate. For the case where the heat generation of some areas of the upper cold plate and/or the lower cold plate is larger, the height of the lower table of the upper cold plate bottom and/or the lower plate of the lower cold plate is adjusted in this area to cool The liquid flows more through the upper surface of the upper cold plate and/or the top surface of the lower cold plate in the area.

The above are only preferred embodiments of the invention and are not intended to limit the invention. It will be apparent to those skilled in the art that various modifications and changes can be made in the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Industrial applicability

The flat water-cooling heat dissipating device of the invention can reduce manufacturing cost and manufacturing difficulty, and improve heat dissipation performance.

Claims

A flat water-cooling heat dissipating device comprises an upper cold plate and a lower cold plate, wherein a top surface of the upper cold plate and/or a bottom surface of the lower cold plate are in contact with the heat generating device; and the feature comprises: a plurality of downwards on the bottom surface of the upper cold plate The raised platform has a plurality of upwardly convex platforms on the top surface of the lower cold plate, and the lower bottom plate of the upper cold plate and the upper surface of the lower cold plate are staggered with each other; the upper cold plate bottom and the lower cold plate top A flow path is formed between the faces, and the coolant flows in the flow path, thereby taking away the heat of the upper and lower cold plates.
The flat water-cooling heat dissipating device according to claim 1, wherein a gap between the lower bottom plate of the upper cold plate and the upper surface of the lower cold plate has a gap.
The flat water-cooling heat dissipating device according to claim 1, wherein when the heat generation amount of the heat generating device in contact with the top surface of the upper cold plate is greater than the heat generation amount of the heat generating device contacting the bottom surface of the lower cold plate, the top surface of the lower cold plate is convex. The distance between the table and the bottom surface of the upper cold plate is greater than the distance between the lower bottom plate of the upper cold plate and the top surface of the lower cold plate;

When the heat generated by the heat generating device contacting the bottom surface of the cold plate is greater than the heat generated by the heat generating device contacting the top surface of the upper cold plate, the distance between the lower bottom plate of the upper cold plate and the top surface of the lower cold plate is greater than the convex plate on the top surface of the lower cold plate. The distance from the bottom surface of the upper cold plate;

When the heat quantity of the heat generating device contacting the top surface of the upper cold plate is equal to the heat quantity of the heat generating device contacting the bottom surface of the lower cold plate, the distance between the boss on the top surface of the lower cold plate and the bottom surface of the upper cold plate is equal to the bottom surface of the upper cold plate. The distance between the boss and the top surface of the lower cold plate.
The flat water-cooling heat dissipating device according to claim 1, wherein when the heat generating device in contact with the top surface of the upper cold plate generates heat in a certain area is larger than the heat generated in the remaining area, the top surface of the lower cold plate in the area The distance between the upper boss and the bottom surface of the upper cold plate is greater than the distance between the boss on the top surface of the lower cold plate and the bottom surface of the upper cold plate in other regions;

When the heat generating device in contact with the top surface of the lower cold plate is larger than the heat generated in the remaining region, the distance between the lower convex plate and the lower cold plate top surface in the upper portion of the upper cold plate is greater than that in other regions. The distance between the lower bottom of the cold plate and the top surface of the lower cold plate.
The flat water-cooling heat dissipating device according to claim 1, wherein the bottom plate of the upper cold plate has a square arrangement between the lower bosses, and each of the four upper square plates arranged in a square shape has a center position between the lower bosses. Having a boss on the top surface of the lower cold plate;

Alternatively, the bosses on the top surface of the lower cold plate are arranged in a square shape, and the center position between the bosses on the top surface of each of the four lower cold plates arranged in a square shape has a lower bottom plate lower boss.
The flat water-cooling heat dissipating device according to claim 1, wherein the bottom plate of the upper cold plate has an equilateral triangle arrangement between the lower bosses, and the center position between the lower bosses of the upper cold plate and the lower bottom plate arranged in an equilateral triangle. Having a boss on the top surface of the lower cold plate;

Alternatively, the bosses on the top surface of the lower cold plate are arranged in an equilateral triangle, and the center position between the bosses on the top surface of each of the four lower cold plates arranged in an equilateral triangle has an upper bottom plate lower boss.
The flat water-cooling heat dissipating device according to claim 1, wherein the end surface of the lower boss of each of the upper cold plates is lower than the end surface of the boss on the top surface of the lower cold plate.
The flat water-cooling heat dissipating device according to claim 1, wherein the lower bottom plate of the upper cold plate and the upper surface of the lower cold plate have a columnar shape or a table shape with smooth side walls.