Liquid cooling device for power module of electric vehicle

Abstract

This invention discloses a water-cooled radiator for an electric vehicle power module, comprising an inlet end, an outlet end, and a cavity. The cavity contains multiple fin regions arranged along the water flow direction. Among the multiple fin regions, at least one high-density fin region is included, such that at least one low-density fin region near the inlet end has a lower density than the higher-density fin region near the inlet end, and at least one low-density fin region near the outlet end has a lower density than the higher-density fin region near the outlet end. Similarly, among the multiple fin regions, at least one low-density fin region is included, such that at least one high-density fin region near the inlet end has a higher density than the lower-density fin region near the inlet end, and at least one high-density fin region near the outlet end has a higher density than the lower-density fin region near the outlet end.

Description

[Technical Field]

[0001] This invention relates to a water-cooled radiator, and more specifically to a water-cooled radiator for an electric vehicle power module. [Previous Technology]

[0002] Currently, electric vehicle power modules on the market, such as IGBT modules or ADAS modules, have an increasing number of chips and areas requiring heat dissipation. Therefore, current water-cooled heat sinks are no longer sufficient to meet the heat dissipation requirements of electric vehicle power modules. Thus, how to more effectively dissipate heat through water-cooling technology has always been a problem that the industry needs to solve. [Summary of the Invention]

[0003] The technical problem to be solved by the present invention is to provide a water-cooled radiator for electric vehicle power modules, which addresses the shortcomings of the prior art.

[0004] This embodiment of the invention provides a water-cooled radiator for an electric vehicle power module, used to contact multiple heat sources of the electric vehicle power module. The water-cooled radiator for the electric vehicle power module has a water inlet, a water outlet, and a cavity connecting the water inlet and the water outlet. The cavity has multiple fin areas arranged along the water flow direction. Among the multiple fin areas, there is at least one high-density fin area, such that at least one low-density fin area near the water inlet is closer to the water inlet and has a lower density than the high-density fin area, and at least one low-density fin area near the water outlet is closer to the water outlet and has a lower density than the high-density fin area. Among the multiple fin areas, there is at least one low-density fin area, such that at least one high-density fin area near the water inlet is closer to the water inlet and has a higher density than the low-density fin area, and at least one high-density fin area near the water outlet is closer to the water outlet and has a higher density than the low-density fin area.

[0005] In a preferred embodiment, the high-density fin region is one of the high-density fin region near the water inlet and the high-density fin region near the water outlet.

[0006] In a preferred embodiment, the low-density fin region is one of the low-density fin region near the inlet end and the low-density fin region near the outlet end.

[0007] In a preferred embodiment, the density of each fin region is defined as the total surface area of ​​the fins calculated by dividing the total projected area of ​​the fins by the maximum number of identical fins among all adjacent fins with the same spacing in each fin region.

[0008] In a preferred embodiment, the cavity is formed by a plate and a cover that fits onto the plate, and the plate and the cover are integrally formed by metal injection molding or forging.

[0009] In a preferred embodiment, the plate and the cover are made of one of copper, copper alloy, aluminum, or aluminum alloy.

[0010] In a preferred embodiment, the fin cross-sectional shape of each fin region is different from that of adjacent different fin regions.

[0011] In a preferred embodiment, the fin height of each fin region is different from that of adjacent different fin regions.

[0012] In a preferred embodiment, the fin spacing between each fin region and the adjacent different fin regions is different.

[0013] In a preferred embodiment, the average fin radius of each fin region is different from that of adjacent different fin regions.

[0014] In a preferred embodiment, the maximum density ratio between the high-density fin area and the low-density fin area near the water inlet is set to 1.1 to 1.6.

[0015] In a preferred embodiment, the maximum density ratio between the high-density fin area and the low-density fin area near the water outlet is set to 1.1 to 1.6.

[0016] In a preferred embodiment, the minimum density ratio between the low-density fin area and the high-density fin area near the water outlet is set to 0.6 to 0.9.

[0017] In a preferred embodiment, the minimum density ratio of the low-density fin area to the high-density fin area near the water outlet is set to 0.6 to 0.9.

[0018] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention.

Implementation Method

[0028] [First Embodiment]

[0029] Please refer to Figures 1 to 4, which illustrate one embodiment of the present invention. This embodiment provides a water-cooled radiator for an electric vehicle power module, used to contact multiple heat sources H of the electric vehicle power module. The heat sources H can be wafers, a DBC (Direct Bonded Copper Ceramic Substrate) with wafers, or an AMB (Active Metal Brazing Ceramic Substrate) with wafers. The electric vehicle power module can be an insulated gate bipolar transistor (IGBT) module or an advanced driver assistance system (ADAS) module. The water-cooled radiator for the electric vehicle power module has a water inlet 1, a water outlet 2, and a cavity 3 connecting the water inlet 1 and the water outlet 2. The cavity 3 has multiple fin areas 4 arranged along the water flow direction D.

[0030] In this embodiment, the cavity 3 contains six or more fin regions 4, and among these fin regions 4, as shown in FIG2, there is at least one high-density fin region A, such that at least one low-density fin region B1 near the water inlet is closer to the water inlet 1 than the higher-density fin region A, and at least one low-density fin region B2 near the water outlet is closer to the water outlet 2 than the higher-density fin region A, and at least one low-density fin region B2 near the water outlet is closer to the water outlet 2, and at least one low-density fin region B among these fin regions 4, such that at least one high-density fin region A1 near the water inlet is closer to the lower-density fin region B, and at least one high-density fin region A2 near the water outlet is closer to the lower-density fin region B, and at least one high-density fin region A2 near the water outlet is closer to the lower-density fin region B, and at least one low-density fin region B2 near the water outlet 2, and at least one high-density fin region B2 near the water outlet is closer to the lower-density fin region B, and at least one low-density fin region B2 near the water outlet 2, and at least one high-density fin region B2 near the water outlet is closer to the lower-density fin region B. In this way, heat dissipation can be achieved for multiple heat sources H of the electric vehicle power module, and the overall heat dissipation temperature can be made uniform.

[0031] Furthermore, the density of each fin region 4 is defined as the total surface area of ​​the fins calculated by dividing the projected area of ​​the fins by the maximum number of identical fins among all adjacent fins 41 with the same interval within each fin region 4. For example, as shown in Figure 2, if the density of a low-density fin region B1 near the inlet end is calculated with a maximum of five adjacent fins 41 with the same interval d1, when comparing the density of a high-density fin region A1 near the inlet end, the density is also calculated by taking five adjacent fins 41 with the same interval d2 from the high-density fin region A1 near the inlet end, even if the high-density fin region A1 near the inlet end may have ten adjacent fins 41 with the same interval d2. The intervals d1 and d2 may not be the same. In addition, the minimum interval between the fins 41 and their adjacent fins 41 within each fin region 4 is the interval referred to.

[0032] Furthermore, as shown in Figures 2 and 3, the total surface area of ​​the fins in the low-density fin region B1 near the water inlet is defined as the total surface area of ​​five adjacent fins 41 with the same interval d1, plus the area of ​​the bottom surface 42 occupied by non-fins 41 within the low-density fin region B1 near the water inlet. The calculation method for the total surface area of ​​the fins in the high-density fin region A1 near the water inlet and the total surface area of ​​the fins in other fin regions is the same.

[0033] The fin projection area E (as shown in Figure 4) of the low-density fin area B1 near the water inlet is defined as the smallest rectangular projection area that can enclose the maximum number of identical fins within this fin area. The fin projection area F (as shown in Figure 4) of the high-density fin area A1 near the water inlet is also defined as the smallest rectangular projection area that can enclose the maximum number of identical fins within this fin area. The calculation method for the fin projection area of ​​other fin areas is the same.

[0034] Furthermore, in order to make the overall heat dissipation temperature more uniform, the maximum preferred density ratio between the high-density fin area A and the low-density fin area B1 near the water inlet is set to 1.1 to 1.6, and the maximum preferred density ratio between the high-density fin area A and the low-density fin area B2 near the water outlet is set to 1.1 to 1.6. Additionally, the minimum preferred density ratio between the low-density fin area B and the high-density fin area A2 near the water outlet is set to 0.6 to 0.9, and the minimum preferred density ratio between the low-density fin area B and the high-density fin area A2 near the water outlet is set to 0.6 to 0.9.

[0035] In this embodiment, each fin region 4 may have a different fin cross-sectional shape than adjacent different fin regions 4.

[0036] In this embodiment, the cavity 3 of the water-cooled radiator for the electric vehicle power module can be formed by a plate 5 and a cover 6 that covers the plate 5, and the plate 5 and the cover 6 can be formed by metal injection molding, forging, or stamping. Furthermore, the fins 41 in each fin area 4 can be integrally formed with the plate 5. Moreover, the plate 5 and the cover 6 can be made of copper, copper alloy, aluminum, or aluminum alloy.

[0037] [Second Embodiment]

[0038] Please refer to Figure 5, which is the second embodiment of the present invention. This embodiment is largely the same as the first embodiment, and the differences are explained below.

[0039] In this embodiment, the plate 5 has five or more fin areas 4 arranged along the water flow direction D. That is to say, the high-density fin area A shown in FIG2 of the first embodiment can be the high-density fin area A1 near the water inlet end of this embodiment, or it can be the high-density fin area A2 near the water outlet end.

[0040] [Third Embodiment]

[0041] Please refer to Figure 6, which is the third embodiment of the present invention. This embodiment is largely the same as the first embodiment, and the differences are explained below.

[0042] In this embodiment, the plate 5 has four or more fin areas 4 arranged along the water flow direction D. That is, the high-density fin area A shown in Figure 2 of the first embodiment can be the high-density fin area A1 near the water inlet end in this embodiment. In addition, the low-density fin area B in this embodiment can be the low-density fin area near the water outlet end, compared to the high-density fin area A1 near the water inlet end.

[0043] [Fourth Embodiment]

[0044] Please refer to Figure 7, which is the fourth embodiment of the present invention. This embodiment is largely the same as the first embodiment, and the differences are explained below.

[0045] In this embodiment, each fin region 4 may have a different fin height than adjacent fin regions 4. The fin height referred to here is the length from the bottom surface of the fin 41 to the top surface of the fin 41, that is, the normal length of the fin 41 itself relative to the bottom surface of the fin 41.

[0046] [Fifth Embodiment]

[0047] Please refer to Figure 8, which is the fifth embodiment of the present invention. This embodiment is largely the same as the first embodiment, and the differences are explained below.

[0048] In this embodiment, the fin spacing of each fin region 4 may be different from that of adjacent different fin regions 4. The fin spacing referred to here is the shortest distance between the fin 41 itself and the adjacent fin 41.

[0049] [Sixth Embodiment]

[0050] Please refer to Figure 9, which is the sixth embodiment of the present invention. This embodiment is largely the same as the first embodiment, and the differences are explained below.

[0051] In this embodiment, the average fin radius of each fin region 4 may be different from that of adjacent fin regions 4. The average fin radius referred to here is the value of the cross-sectional area of ​​the fin 41 divided by the square root of pi.

[0052] In summary, the electric vehicle power module water-cooled radiator provided by the present invention is used to contact multiple heat sources of the electric vehicle power module, and has a water inlet, a water outlet, and a cavity connecting the water inlet and the water outlet. The cavity contains multiple fin areas arranged along the water flow direction. Among the multiple fin areas, at least one high-density fin area is included, such that at least one low-density fin area near the water inlet has a lower density than the higher-density fin area near the water inlet, and at least one low-density fin area near the water outlet has a lower density than the higher-density fin area near the water outlet. Similarly, among the multiple fin areas, at least one low-density fin area is included, such that at least one high-density fin area near the water inlet has a higher density than the lower-density fin area near the water inlet, and at least one high-density fin area near the water outlet has a higher density than the lower-density fin area near the water outlet. Thus, heat can be dissipated from multiple heat sources of the electric vehicle power module, and the overall heat dissipation temperature is uniform.

[0053] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention. [Simplified Explanation of the Diagram]

[0019] Figure 1 is a side view of the fin area of ​​the first embodiment of the present invention.

[0020] Figure 2 is a top view of the fin area of ​​the first embodiment of the present invention.

[0021] Figure 3 is a schematic diagram of the fins of the first embodiment of the present invention.

[0022] Figure 4 is a schematic diagram of the fin projection area of ​​the first embodiment of the present invention.

[0023] Figure 5 is a top view of the fin area of ​​the second embodiment of the present invention.

[0024] Figure 6 is a top view of the fin area of ​​the third embodiment of the present invention.

[0025] Figure 7 is a side view of the fin area of ​​the fourth embodiment of the present invention.

[0026] Figure 8 is a side view of the fin area of ​​the fifth embodiment of the present invention.

[0027] Figure 9 is a side view of the fin area of ​​the sixth embodiment of the present invention.

Claims

1. A water-cooled radiator for an electric vehicle power module, used to contact multiple heat sources of an electric vehicle power module, the water-cooled radiator having an inlet end, an outlet end, and a cavity connecting the inlet end and the outlet end, the cavity having multiple fin areas arranged along the water flow direction; wherein, Among the plurality of fin regions, at least one high-density fin region is included, such that at least one low-density fin region near the water inlet is closer to the water inlet and has a lower density than the high-density fin region, and at least one low-density fin region near the water outlet is closer to the water outlet and has a lower density than the high-density fin region; wherein, among the plurality of fin regions, at least one low-density fin region is included, such that at least one high-density fin region near the water inlet is closer to the water inlet and has a higher density than the low-density fin region, and at least one high-density fin region near the water outlet is closer to the water outlet and has a higher density than the low-density fin region; wherein, the most... The density ratio is set to 1.1~1.6, and the maximum density ratio between the high-density fin area and the low-density fin area near the water outlet is set to 1.1~1.6, and the fin spacing between each fin area and adjacent different fin areas is different; wherein, there are at least six fin areas in the cavity; among the at least six fin areas, there are at least three high-density fin areas, one of which is the high-density fin area near the water inlet, and the other of which is the high-density fin area near the water outlet; among the at least six fin areas, there are at least three low-density fin areas, one of which is the low-density fin area near the water inlet, and the other of which is the low-density fin area near the water outlet.

2. The water-cooled radiator for the electric vehicle power module as described in claim 1, wherein, The density of each fin region is defined as the total surface area of ​​the fins calculated by dividing the total projected area of ​​the fins by the maximum number of identical fins among all adjacent fins with the same spacing within each fin region.

3. The water-cooled radiator for the electric vehicle power module as described in claim 1, wherein, The cavity is formed by a plate and a cover that fits onto the plate, and the plate and the cover are formed by metal injection molding, forging or stamping.

4. The water-cooled radiator for the electric vehicle power module as described in claim 3, wherein, The plate and the cover are made of one of copper, copper alloy, aluminum, or aluminum alloy.

5. The water-cooled radiator for the electric vehicle power module as described in claim 1, wherein, The fin cross-sectional shape of each fin region is different from that of adjacent fin regions.

6. The water-cooled radiator for the electric vehicle power module as described in claim 1, wherein, The fin heights of each fin region are different from those of adjacent fin regions.

7. The water-cooled radiator for the electric vehicle power module as described in claim 1, wherein, The average radius of the fins in each of the fin regions is different from that in adjacent fin regions.

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