Double-sided water-cooling power module and welding, positioning and fixing device and method thereof

Abstract

The invention relates to a double-sided water-cooling power module and a welding, positioning and fixing device and method thereof, and the double-sided water-cooling power module is located between an upper substrate and a lower substrate of the welding, positioning and fixing device, and is fastened and assembled through matched positioning pin holes in the upper substrate and the lower substrate and detachable screws. And the double-sided water-cooling power module is welded by adopting the method. Compared with the prior art, the method has the advantages of simplicity and convenience in installation, high process stability and consistency and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of radiators, and in particular to a double-sided water-cooled power module and a welding device and method thereof. Background Art

[0002] With the development of the new energy vehicle industry, the inverter, as one of the core components of electric and hybrid vehicles, has put forward higher and higher requirements on its power performance. Nowadays, the automotive industry has begun to gradually explore and form a trend, that is, to use a new type of SiC transistor to build an 800V battery high-voltage system. The use of this technology can give the car a longer range and faster charging speed, but at the same time, the rapidly increasing power density also puts a huge load on the switching components in the inverter. Severe overheating and overheating problems pose a serious threat to the normal operation of the entire system module, and even damage it. In addition to optimizing the design of the switching components themselves and reducing losses, another way to solve this problem is to enhance the performance of the radiator and use the radiator to take away excess heat.

[0003] Although welding pads are currently used instead of thermal interface materials to connect the heat sink and the heating device during the assembly of water-cooled radiators, they are mainly used in the cooling process of single-sided radiators due to process limitations. They also have problems such as difficulty in positioning the welding pads, difficulty in maintaining consistency in the welding process, and difficulty in controlling the welding temperature during the double-sided water cooler welding process. Summary of the invention

[0004] The purpose of the present invention is to provide a welding device and method for a double-sided water-cooled power module in order to overcome the defects of the above-mentioned prior art, and to simplify the assembly process of the double-sided water-cooled power module based on the welding device and the welding method.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] According to one aspect of the present invention, a welding positioning and fixing device for a double-sided water-cooled power module is provided, wherein the double-sided water-cooled power module comprises a heat dissipation device and a heating device, the welding device comprises a positioning member and a fixing member, the positioning member comprises a lower substrate and a welding piece positioning member; the fixing member comprises a welding piece and an upper substrate; the double-sided water-cooled power module is placed between the lower substrate and the upper substrate, and is arranged in sequence according to the heat dissipation device, the heating device and the heat dissipation device through matching pin hole structures of the lower substrate and the upper substrate; the heat dissipation device and the heating device are welded and connected by welding pieces; the welding piece is arranged between the heat dissipation device and the heating device through a welding piece positioning piece.

[0007] As an optimal technical solution, the upper base plate and the lower base plate are hollow structures, and the upper base plate is provided with screw holes, module positioning holes and base plate positioning holes; the lower base plate includes bolt columns, module positioning pins and base plate positioning pins matching the upper base plate, and also includes a first positioning hole.

[0008] As a preferred technical solution, the solder piece positioning sheet further includes a plurality of solder piece positioning grooves, and the arrangement of the solder piece positioning grooves matches the arrangement of the heating device.

[0009] As a preferred technical solution, the soldering plate positioning plate further includes a second positioning hole, and the soldering plate positioning plate is placed between the heat dissipation device and the heating component through the module positioning pin and the second positioning hole.

[0010] As a preferred technical solution, detachable fastening screws are provided in the screw holes of the upper base plate and the bolt columns of the lower base plate.

[0011] According to another aspect of the present invention, a double-sided water-cooled power module is provided, including a heat dissipation device and a heating element, the heat dissipation device includes a sewer heat dissipation plate and an upper water channel heat dissipation plate, the double-sided water-cooled power module is composed of a sewer heat dissipation plate, a heating element and an upper water channel heat dissipation plate from bottom to top, and is assembled and welded by the above-mentioned welding positioning and fixing device.

[0012] As a preferred technical solution, the heating device includes terminals that match the module positioning pins of the lower substrate in the welding device.

[0013] As a preferred technical solution, the double-sided water-cooled power module also includes a supporting device, and the supporting device includes a retaining frame, and the retaining frame is fixed between the heating device and the upper water channel heat sink.

[0014] As a preferred technical solution, the retaining frame includes a latch that matches the first positioning hole of the lower base plate in the welding device.

[0015] According to a third aspect of the present invention, a double-sided water-cooled power module welding method is provided, the method is used to weld the above-mentioned double-sided water-cooled power module, and comprises the following steps:

[0016] S1. Fix the sewer heat sink on the lower base plate through the module positioning pins;

[0017] S2, fix the soldering piece positioning sheet on the sewer heat sink through the second positioning hole and the module positioning pin, place the soldering piece in the soldering piece positioning groove of the soldering piece positioning sheet, remove the soldering piece positioning sheet after fixing the position, then fix the heating element on the soldering piece through the terminal and the module positioning pin, and then place the soldering piece on the heating element through the soldering piece positioning sheet;

[0018] S3, positioning and installing the holder at both ends of the heating device through its latch and the first positioning hole of the lower substrate, and fixing the upper water channel heat dissipation plate on the holder through the module positioning pin;

[0019] S4, installing the upper base plate on the upper water channel heat dissipation plate through the pin hole structure matching the lower base plate, and fastening the module through the screw holes and bolt columns;

[0020] S5, placing the double-sided water-cooled power module assembled according to S1-S4 in a vacuum welding chamber, and heating the upper and lower surfaces of the power module simultaneously;

[0021] S6, after heating is finished, wait for cooling, after cooling, remove the upper substrate and the lower substrate to complete welding.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] 1) The present invention provides a welding positioning and fixing device for a double-sided water-cooled power module, which makes the welding piece assembly more accurate by setting a welding piece positioning piece to avoid the problem of module welding failure caused by inaccurate welding piece positioning;

[0024] 2) The present invention only uses two upper and lower hollow substrates and a welding piece positioning sheet, uses fewer parts, is fixed with screws, is easy to disassemble when reused, has a simple and clear installation process, and is accurate and convenient in positioning, ensuring the consistency and stability of the welding process;

[0025] 3) The present invention places the fixed double-sided water-cooled power module in a vacuum welding chamber and heats the upper and lower surfaces at the same time, thereby solving the problem that when welding the upper water channel heat sink and the heating device, the welding of the lower water channel heat sink and the heating device falls off or is misaligned due to the welding temperature of the upper water channel heat sink and the heating device, which is caused by improper welding temperature setting. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a welding device in Example 1 of the present invention;

[0027] Figure 2 This is a schematic diagram of assembling a double-sided water-cooled power module device welding device in Example 2 of the present invention;

[0028] Figure 3 This is a rendering of the completed assembly in Example 3 of the present invention.

[0029] Reference numerals:

[0030] 1-upper base plate, 2-lower base plate, 3-power module, 4-solder plate positioning plate, 5-module positioning hole, 6-screw hole, 7-base plate positioning hole, 8-solder plate positioning groove, 9-second positioning hole, 10-first positioning hole, 11-module positioning pin, 12-base plate positioning pin, 13-terminal positioning pin, 14-bolt column, 15-sewer heat sink, 16-solder plate, 17-heating device, 18-terminal, 19-retaining frame, 20-upper water channel heat sink. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0032] Embodiment 1:

[0033] In this embodiment, a welding positioning and fixing device for a double-sided water-cooled power module is provided to assist in welding the double-sided water-cooled power module and simplify the process flow of the welding process.

[0034] The structural diagram of the welding device is as follows Figure 1 As shown, it includes a positioning member and a fixing member, the positioning member includes a lower substrate 2 and a welding piece positioning member 4; the fixing member includes a welding piece 16 and an upper substrate 1; the double-sided water-cooled power module 3 includes a heat dissipation device and a heating element 17.

[0035] In order to ensure that heat can be fully absorbed and transferred during the welding process, the upper substrate 1 and the lower substrate 2 are hollow structures. The lower substrate 2 is provided with a module positioning pin 11 for fixing and positioning the double-sided water-cooled power module 3, a substrate positioning pin 12 for fixing and installing the upper substrate, and a bolt column 14 for fastening and installing the double-sided water-cooled power module 3, and the lower substrate 2 is also provided with a first positioning hole 10; the upper substrate 1 is provided with a substrate positioning hole 7 matching the substrate positioning pin 12, a module positioning hole 5 matching the module positioning pin 11, and a screw hole 6 matching the bolt column 14. Removable fastening screws are provided in the screw hole 6 of the upper substrate 1 and the bolt column 14 of the lower substrate 2.

[0036] During installation, the double-sided water-cooled power module 3 is placed between the lower substrate 2 and the upper substrate 1, and the heat sink, the heating element 17 and the heat sink are arranged in sequence through the matching pin hole structure of the lower substrate 2 and the upper substrate 1, and the heat sink and the heating element 17 are welded and connected by the welding sheet 16.

[0037] A second positioning hole 9 is provided on the soldering plate positioning plate 4, and the soldering plate positioning plate 4 is placed between the heat dissipation device and the heating device 17 through the module positioning pin 11 and the second positioning hole 9. Because the soldering plate positioning plate 4 is provided with a soldering plate positioning groove 8 that matches the arrangement of the heating device 17, the soldering plate 16 can be arranged between the heat dissipation device and the heating device 17 at a specific position with the help of the soldering plate positioning plate 4, and the soldering plate positioning plate 4 is removed after the soldering plate 16 is placed in a fixed position.

[0038] Embodiment 2:

[0039] This embodiment provides a double-sided water-cooled power module, which is assembled and welded by the welding positioning and fixing device in the above embodiment.

[0040] The double-sided water-cooled power module includes a heat dissipation device and a heating element 17, as shown in FIG. Figure 2 As shown in the structural diagram, the sewer heat sink 15, the heating device 17 and the water supply heat sink 20 are fixed to the lower base plate 2 of the welding positioning and fixing device through the module positioning pins 11 from bottom to top, wherein the sewer heat sink 15, the heating device 17 and the water supply heat sink 20 are provided with a hole structure that is engaged with the module positioning pins 11, and the heating device 17 is provided with a terminal 18 that matches the module positioning pins 11.

[0041] In order to prevent the welding piece 16 placed on the heating device 17 from shifting due to operational reasons when placing the upper water channel heat sink 20, a supporting device is also arranged between the heating device 17 and the upper water channel heat sink 20. The supporting device is a retaining frame 19 with a pin matching the first positioning hole 10 of the lower substrate 2 of the welding device. The retaining frame 19 is installed with the first positioning hole 10 on the lower substrate 2 through the pin.

[0042] Embodiment 3:

[0043] This embodiment provides a double-sided water-cooled power module welding method, which is used to weld the above-mentioned double-sided water-cooled power module, and includes the following steps:

[0044] S1, fix the sewer heat sink 15 on the lower base plate 2 through the module positioning pins 11;

[0045] S2, fix the soldering piece positioning piece 4 on the sewer heat sink 15 through the second positioning hole 9 and the module positioning pin 11, place the soldering piece 16 in the soldering piece positioning groove 8 of the soldering piece positioning piece 4, remove the soldering piece positioning piece 4 after fixing the position, then fix the heating element 17 on the soldering piece 16 through the terminal 18 and the module positioning pin 11, and then place the soldering piece 16 on the heating element 17 through the soldering piece positioning piece 4;

[0046] S3, the holder 19 is positioned and installed at both ends of the heating device 17 through its latch and the first positioning hole 10 of the lower base plate 2, and the upper water channel heat sink 20 is fixed to the holder 19 through the module positioning pin 11;

[0047] S4, the upper base plate 1 is installed on the upper water channel heat dissipation plate 20 through the pin hole structure matching the lower base plate 2, and the module is fastened and installed through the screw holes 6 and the bolt columns 14. After the assembly is completed, Figure 3 As shown;

[0048] S5, placing the double-sided water-cooled power module assembled according to S1-S4 in a vacuum welding chamber, and heating the upper and lower surfaces of the power module simultaneously;

[0049] S6, after heating is finished, wait for cooling, after cooling, remove the upper substrate 1 and the lower substrate 2, and a double-sided water-cooled power module can be obtained.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A welding positioning and fixing device for a double-sided water-cooled power module, the double-sided water-cooled power module (3) comprising a heat dissipation device and a heating element (17), characterized in that: The welding device comprises a positioning member and a fixing member, wherein the positioning member comprises a lower substrate (2) and a welding piece positioning member (4); the fixing member comprises a welding piece (16) and an upper substrate (1); The double-sided water-cooled power module (3) is placed between the lower substrate (2) and the upper substrate (1), and is arranged in sequence according to the heat dissipation device, the heating element (17) and the heat dissipation device through a matching pin hole structure of the lower substrate (2) and the upper substrate (1); The heat dissipation device and the heating element (17) are connected by welding via a welding sheet (16); The welding sheet (16) is arranged between the heat dissipation device and the heating element (17) via a welding sheet positioning sheet (4).

2. A welding positioning and fixing device for a double-sided water-cooled power module according to claim 1, characterized in that: The upper substrate (1) and the lower substrate (2) are hollow structures. The upper substrate (1) is provided with screw holes (6), module positioning holes (5) and substrate positioning holes (7); the lower substrate (2) includes bolt columns (14) matching the upper substrate (1), module positioning pins (11) and substrate positioning pins (12), and also includes a first positioning hole (10).

3. A welding positioning and fixing device for a double-sided water-cooled power module according to claim 1, characterized in that: The soldering plate positioning plate (4) further comprises a plurality of soldering plate positioning grooves (8), and the arrangement of the soldering plate positioning grooves (8) matches the arrangement of the heating element (17).

4. A welding positioning and fixing device for a double-sided water-cooled power module according to claim 1, characterized in that: The soldering plate positioning plate (4) further comprises a second positioning hole (9), and the soldering plate positioning plate (4) is placed between the heat dissipation device and the heating element (17) via the module positioning pin (11) and the second positioning hole (9).

5. A welding positioning and fixing device for a double-sided water-cooled power module according to claim 1, characterized in that: Removable fastening screws are provided in the screw holes (6) of the upper base plate (1) and the bolt columns (14) of the lower base plate (2).

6. A double-sided water-cooled power module, comprising a heat dissipation device and a heating element (17), wherein the heat dissipation device comprises a lower water channel heat dissipation plate (15) and an upper water channel heat dissipation plate (20), characterized in that: The double-sided water-cooled power module comprises, from bottom to top, a lower water channel heat sink (15), a heating element (17) and an upper water channel heat sink (20); The double-sided water-cooled power module is assembled and welded by a welding positioning and fixing device, wherein the welding positioning and fixing device comprises a positioning member and a fixing member, wherein the positioning member comprises a lower substrate (2) and a welding piece positioning member (4); the fixing member comprises a welding piece (16) and an upper substrate (1); the double-sided water-cooled power module (3) is placed between the lower substrate (2) and the upper substrate (1), and is arranged in sequence according to the heat dissipation device, the heating element (17) and the heat dissipation device through a matching pin hole structure of the lower substrate (2) and the upper substrate (1); the heat dissipation device and the heating element (17) are connected by welding through the welding piece (16); the welding piece (16) is arranged between the heat dissipation device and the heating element (17) through the welding piece positioning member (4); The upper substrate (1) and the lower substrate (2) are hollow structures, and the upper substrate (1) is provided with screw holes (6), module positioning holes (5) and substrate positioning holes (7); the lower substrate (2) includes bolt columns (14) matching the upper substrate (1), module positioning pins (11) and substrate positioning pins (12), and also includes a first positioning hole (10); The soldering plate positioning plate (4) further comprises a plurality of soldering plate positioning grooves (8), and the arrangement of the soldering plate positioning grooves (8) matches the arrangement of the heating element (17); The soldering plate positioning plate (4) further comprises a second positioning hole (9), and the soldering plate positioning plate (4) is placed between the heat dissipation device and the heating element (17) via the module positioning pin (11) and the second positioning hole (9).

7. A double-sided water-cooled power module according to claim 6, characterized in that: It also includes a supporting device, which includes a retaining frame (19) and the retaining frame is fixed between the heating device (17) and the upper water channel heat dissipation plate (20).

8. A double-sided water-cooled power module according to claim 7, characterized in that: The retaining frame (19) comprises a latch that matches a first positioning hole (10) of a lower base plate (2) in the welding device.

9. A double-sided water-cooled power module according to claim 8, characterized in that: The heating device (17) comprises a terminal (18) matching the module positioning pin (11) of the lower substrate (2) in the welding device.

10. A double-sided water-cooled power module welding method, characterized in that: The method is used for welding the double-sided water-cooled power module described in any one of claims 7 to 9, comprising the following steps: S1, fixing the sewer heat sink (15) on the lower base plate (2) via the module positioning pins (11); S2, fix the welding piece positioning piece (4) on the sewer heat sink (15) through the second positioning hole (9) and the module positioning pin (11), place the welding piece (16) in the welding piece positioning groove (8) of the welding piece positioning piece (4), remove the welding piece positioning piece (4) after fixing the position, then fix the heating element (17) on the welding piece (16) through the terminal (18) and the module positioning pin (11), and then place the welding piece (16) on the heating element (17) through the welding piece positioning piece (4); S3, positioning and installing the retaining frame (19) at the head and tail ends of the heating device (17) through its latch and the first positioning hole (10) of the lower base plate (2), and fixing the upper water channel heat dissipation plate (20) on the retaining frame (19) through the module positioning pin (11); S4, installing the upper base plate (1) on the upper water channel heat dissipation plate (20) through the pin hole structure matching the lower base plate (2), and fastening and installing the module through the screw holes (6) and the bolt columns (14); S5, placing the double-sided water-cooled power module assembled according to S1-S4 in a vacuum welding chamber, and heating the upper and lower surfaces of the power module simultaneously; S6, after heating is completed, wait for cooling, and after cooling, remove the upper substrate (1) and the lower substrate (2) to complete welding.

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