A welding fixture for water-cooled plates based on DCM packaging

Abstract

This invention provides a water-cooled plate welding fixture based on DCM packaging, including a main plate and a water-cooled plate auxiliary groove. The main plate has a first side and a second side facing away from each other. The water-cooled plate auxiliary groove is formed on the first side of the main plate. The shape of the water-cooled plate auxiliary groove corresponds to the shape of the flow protrusion on the water-cooled plate to be welded, which is used for the flow of coolant. The depth of the water-cooled plate auxiliary groove is the same as the height of the flow protrusion. When the main plate is connected to the water-cooled plate to be welded, the flow protrusion is fitted into the water-cooled plate auxiliary groove. This water-cooled plate welding fixture based on DCM packaging can fill the gap between the water-cooled plate and the return tray, solving the problem of uneven heat transfer caused by the uneven structure of the water-cooled plate during the welding process, thereby improving the welding quality of the product and increasing the yield of the water-cooled plate welding process.

Description

Technical Field

[0001] This utility model belongs to the field of semiconductor integrated circuit manufacturing technology, and relates to a water-cooled plate welding fixture based on DCM packaging. Background Technology

[0002] Currently, DCM (Discrete Coated Module) power modules typically employ a sandwich structure consisting of a water-cooled plate, solder pads, and an AMB (Active Metal Brazing) copper-clad ceramic substrate, all placed together on an ATV (Automated Thermal Vision) reflow tray for reflow soldering. However, the back of the water-cooled plate is not a continuous flat surface but rather has a complex morphology with grooves and bosses. During soldering, the heat transfer of the ATV reflow equipment relies on the direct contact between the tray and the water-cooled plate. This results in the localized area where the water-cooled plate contacts the reflow tray heating up rapidly due to high heat transfer efficiency, while areas with poor contact exhibit a lag in temperature response. Consequently, the solder cannot melt simultaneously at the same melting point, leading to uneven solder flow and ultimately forming numerous voids at the solder interface. This reduces soldering quality and the module's heat dissipation capacity, limiting the yield and lifespan of high-power DCM packages.

[0003] Therefore, how to provide a water-cooled plate welding fixture based on DCM packaging to fill the gap between the water-cooled plate and the return tray, solve the problem of uneven heat transfer caused by the uneven structure of the water-cooled plate during the welding process, and improve the welding quality of the product has become an important problem that needs to be solved by those skilled in the art.

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application. Utility Model Content

[0005] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a water-cooled plate welding fixture based on DCM packaging, which can solve the problems of uneven heat transfer and poor welding quality caused by the uneven structure of the water-cooled plate during the welding process in the prior art.

[0006] To achieve the above and other related objectives, this utility model provides a water-cooled plate welding fixture based on DCM packaging, comprising:

[0007] The main body panel includes a first side and a second side that are opposite to each other;

[0008] A water-cooled plate auxiliary groove is formed on the first surface of the main body plate. The shape of the water-cooled plate auxiliary groove corresponds to the shape of the flow protrusion on the water-cooled plate to be welded for the flow of coolant. The depth of the water-cooled plate auxiliary groove is the same as the height of the flow protrusion.

[0009] When the main plate is connected to the water-cooled plate to be welded, the flow groove is fitted into the auxiliary groove of the water-cooled plate.

[0010] Optionally, the auxiliary groove of the water-cooled plate includes an inner groove and an outer groove surrounding and communicating with the inner groove.

[0011] Optionally, the horizontal plane where the external groove opening is located is the same as the horizontal plane where the first surface of the main body plate is located, and the horizontal plane where the internal groove opening is located is higher than the horizontal plane where the first surface of the main body plate is located.

[0012] Optionally, the depth of the inner groove is greater than the depth of the outer groove.

[0013] Optionally, the depth of the external groove ranges from 3.5mm to 4.5mm.

[0014] Optionally, the depth of the internal groove is in the range of 4mm to 5mm.

[0015] Optionally, the thickness of the main body plate is in the range of 4.5mm to 5.5mm.

[0016] Optionally, the width of the main body plate is in the range of 50mm to 60mm.

[0017] Optionally, the length of the main body plate is in the range of 60mm to 70mm.

[0018] Optionally, the length of the internal groove region ranges from 40mm to 50mm.

[0019] As described above, the DCM-packaged water-cooled plate welding fixture of this invention includes a main plate and a water-cooled plate auxiliary groove. The main plate includes a first side and a second side facing away from each other. The water-cooled plate auxiliary groove is formed on the first side of the main plate. The shape of the water-cooled plate auxiliary groove corresponds to the shape of the flow protrusion on the water-cooled plate to be welded, which is used for the flow of coolant. The depth of the water-cooled plate auxiliary groove is the same as the height of the flow protrusion. When the main plate is connected to the water-cooled plate to be welded, the flow protrusion is fitted into the water-cooled plate auxiliary groove. The DCM-packaged water-cooled plate welding fixture of this invention can fill the gap between the water-cooled plate and the return tray, solving the problem of uneven heat transfer caused by the uneven structure of the water-cooled plate during the welding process, thereby improving the welding quality of the product and increasing the yield of the water-cooled plate welding process. Attached Figure Description

[0020] Figure 1 The diagram shown is a schematic of a DCM packaging soldering assembly.

[0021] Figure 2 Displayed as Figure 1 The diagram shows the front structure of the water-cooled plate to be welded.

[0022] Figure 3 Displayed as Figure 1 The diagram shows the back structure of the water-cooled plate to be welded.

[0023] Figure 4 Displayed as Figure 1 The cross-sectional view of the water-cooled plate to be welded is shown.

[0024] Figure 5 The diagram shown is a three-dimensional structural schematic of the water-cooled plate welding fixture based on DCM packaging according to this utility model.

[0025] Figure 6 The diagram shows the working state of the water-cooled plate welding fixture based on DCM packaging according to this utility model.

[0026] Figure 7 The image shown is a cross-sectional view of the water-cooled plate welding fixture based on DCM packaging according to this utility model.

[0027] Figure 8 Displayed as Figure 7 A magnified view of region P in the middle.

[0028] Figure 9 The image shown is a top view of the DCM-based water-cooled plate welding fixture of this invention.

[0029] Explanation of reference numerals in the attached drawings: 1. Return tray; 2. DCM packaging module welding substrate; 201. Water-cooled plate to be welded; 202. Solder sheet; 203. AMB copper-clad ceramic substrate; 3. Flow groove; 301. Outer side wall; 302. Inner side wall; 6. Main plate; 7. Water-cooled plate auxiliary groove; 701. Internal groove; 702. External groove; A. Front side of the water-cooled plate to be welded; B. Back side of the water-cooled plate to be welded; C. First side of the main plate; D. Second side of the main plate; H1. Height of the flow groove; H2. Depth of the internal groove; H3. Depth of the external groove; H4. Thickness of the main plate; W1. Width of the main plate; L1. Length of the main plate; L2. Length of the internal groove area. Detailed Implementation

[0030] Please see Figure 1The diagram shows a DCM packaging welding assembly, which includes a reflow tray 1 and a DCM packaging module welding substrate 2. The DCM packaging module welding substrate 2 includes a water-cooled plate 201 to be welded, a solder pad 202 and an AMB copper-clad ceramic substrate 203 stacked on the reflow tray 1 in sequence.

[0031] During the welding process of the water-cooled plate 201 to be welded, please refer to Figures 2 to 4 ,in, Figure 2 Displayed as Figure 1 The diagram shown is a structural schematic of the front side of the water-cooled plate to be welded. Figure 3 Displayed as Figure 1 The diagram shown is a structural schematic of the back of the water-cooled plate to be welded. Figure 4 Displayed as Figure 1 The cross-sectional view of the water-cooled plate to be welded is shown. The front side A of the water-cooled plate 201 is welded to the AMB copper-clad ceramic substrate 203 via the solder pad 202, and the back side B of the water-cooled plate 201 is heated and melted by the return tray 1. That is, the solder pad 202 is in contact with the front side A of the water-cooled plate 201, and the return tray 1 is in contact with the back side B of the water-cooled plate 201. Therefore, during the welding process, the back side of the water-cooled plate 201 is in contact with the return tray 1, thereby transferring high temperature to the solder pad 202 connected to the front side of the water-cooled plate 201, thereby melting the solder pad 202 to achieve welding of the water-cooled plate 201.

[0032] However, during the welding process, because the back side B of the water-cooled plate 201 to be welded has a flow groove 3 for the flow of coolant, the back side B of the water-cooled plate 201 to be welded is not a flat structure, but has a height difference in the Z direction and is uneven. The ATV reflow welding equipment uses a heat contact heat transfer method, which means that at the same time point, the temperature of the part of the back side B of the water-cooled plate 201 to be welded that can contact the reflow tray 1 will be relatively higher, and the temperature of the part that cannot contact the reflow tray 1 will be lower (that is, the flow groove 3 makes a partial gap between the water-cooled plate 201 to be welded and the reflow tray 1, and the temperature of the part of the water-cooled plate 201 to be welded that has a gap with the reflow tray 1 is lower). This causes the melting time of the weld piece 202 to be inconsistent, thus causing welding voids and poor welding quality.

[0033] To address this issue and solve the problem of uneven heat transfer caused by the uneven structure of the DCM-packaged water-cooled plate during the welding process, the inventors of this application have proposed a welding fixture for the DCM-packaged water-cooled plate, which can fill the gap between the water-cooled plate and the return tray, thus solving the problem of uneven heat transfer caused by the uneven structure of the water-cooled plate during the welding process and improving the welding quality of the product.

[0034] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0035] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components.

[0036] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0037] In the detailed description of the embodiments of this utility model, for ease of explanation, the schematic diagrams illustrating the device structure may be partially enlarged without adhering to the general scale, and the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. Furthermore, in actual manufacturing, the three-dimensional spatial dimensions of width, length, and depth should be included.

[0038] For ease of description, spatial relation terms such as “below,” “under,” “lower than,” “below,” “above,” and “upper” may be used herein to describe the relationship between one element or feature shown in the accompanying drawings and other elements or features. It will be understood that these spatial relation terms are intended to include directions other than those depicted in the drawings for devices in use or operation. Furthermore, when a layer is referred to as being “between” two layers, it may be the only layer between the two layers, or there may be one or more layers in between.

[0039] In the context of this application, the structure described above the first feature may include embodiments in which the first and second features are in direct contact, or embodiments in which additional features are formed between the first and second features, such that the first and second features may not be in direct contact.

[0040] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0041] Please see Figure 5 The image shows a three-dimensional structural diagram of the water-cooled plate welding fixture based on DCM packaging according to this utility model. The welding fixture includes a main plate 6 and a water-cooled plate auxiliary groove 7. The main plate 6 includes a first surface C and a second surface D facing away from each other. The water-cooled plate auxiliary groove 7 is formed on the first surface C of the main plate 6.

[0042] Specifically, the shape of the auxiliary groove 7 of the water-cooled plate corresponds to the shape of the flow protrusion 3 on the water-cooled plate 201 to be welded, and the depth of the auxiliary groove 7 of the water-cooled plate is the same as the height H1 of the flow protrusion 3. When the main plate 6 is connected to the water-cooled plate 201 to be welded, the flow protrusion 3 is fitted into the auxiliary groove 7 of the water-cooled plate.

[0043] Please see Figure 6 During the welding process, the operator first aligns and fits the side of the DCM-packaged water-cooled plate welding fixture with the auxiliary groove 7 of the water-cooled plate with the flow groove 3 of the water-cooled plate 201 to be welded together. This compensates for the unevenness of the back of the water-cooled plate 201 in the Z direction. Then, the side of the water-cooled plate welding fixture away from the auxiliary groove 7 is brought into contact with the return tray 1, allowing the return tray 1 to evenly transfer heat to the water-cooled plate 201 through the welding fixture. This ensures uniform temperature across all parts of the water-cooled plate 201, preventing voids in the weld layer and improving the welding quality. Finally, after the solder pads 202 on the front of the DCM-packaged water-cooled plate 201 have cooled, the DCM-packaged water-cooled plate welding fixture is removed to complete the welding of the water-cooled plate 201. It should be noted that this is for ease of demonstration of the welding process. Figure 6 The diagram shows the state of the water-cooled plate welding fixture based on DCM packaging before it is fitted with the water-cooled plate 201 to be welded.

[0044] In this embodiment, the depth of the water-cooled plate auxiliary groove 7 is the same as the height H1 of the flow protrusion 3, with an error of 0.05 mm. That is, after the water-cooled plate auxiliary groove 7 and the flow protrusion 3 are fitted together, the effect of uniform heat transfer can be achieved as long as the distance between the water-cooled plate auxiliary groove 7 and the flow protrusion 3 is less than 0.05 mm.

[0045] The DCM-based water-cooled plate welding fixture can fill the gap between the water-cooled plate 201 to be welded and the return tray 1, solving the problem of uneven heat transfer caused by the uneven structure of the water-cooled plate 201 to be welded during the welding process, improving the welding quality of the product, and increasing the yield of the welding process of the water-cooled plate 201 to be welded.

[0046] Furthermore, the material of the DCM-based water-cooled plate welding fixture is aluminum alloy, which improves the thermal conductivity of the DCM-based water-cooled plate welding fixture and facilitates heat conduction between the return tray 1 and the water-cooled plate 201 to be welded. In this embodiment, the aluminum alloy is 6063-T5 aluminum alloy, which conforms to the requirements of grade 6063 in GB / T 3190-2020 "Chemical Composition of Wrought Aluminum and Aluminum Alloys", wherein the content of Si is 0.20-0.60%, Fe≤0.35%, Cu≤0.10%, Mn≤0.10%, Mg 0.45-0.90%, Cr≤0.10%, Zn≤0.10%, Ti≤0.10%, and the remainder is Al. The heat treatment state is T5 (solution heat treatment followed by artificial aging).

[0047] For example, please refer to Figure 7 The water-cooled plate auxiliary groove 7 includes an inner groove 701 and an outer groove 702 that surrounds and communicates with the inner groove 701.

[0048] As an example, the horizontal plane where the opening of the external groove 702 is located is the same as the horizontal plane where the first surface C of the main body plate 6 is located, and the horizontal plane where the opening of the internal groove 701 is located is higher than the horizontal plane where the first surface C of the main body plate 6 is located.

[0049] exist Figure 7 In the embodiments, please refer to Figure 8 Displayed as Figure 7 A magnified view of region P shows that the depth H2 of the inner groove 701 is greater than the depth H3 of the outer groove 702. Both the depth H2 of the inner groove 701 and the depth H3 of the outer groove 702 refer to the distance from the bottom of the groove along the direction from the first surface C of the main body plate to the second surface D of the main body plate, to the opening of the groove, to better fit the water-cooled plate 201 to be welded. See also... Figure 4The flow groove 3 on the water-cooled plate 201 to be welded extends into the interior of the water-cooled plate 201 to be welded. That is, the thickness of the inner wall 301 of the flow groove 3 in the vertical direction is greater than the thickness of the outer wall 302 in the vertical direction. Therefore, setting the depth H2 of the inner groove 701 to be greater than the depth H3 of the outer groove 702 is to achieve a complete fit between the DCM-based water-cooled plate welding fixture and the water-cooled plate 201 to be welded, avoiding gaps. In other embodiments, if the thickness of the inner wall 301 of the flow groove 3 on the water-cooled plate 201 in the vertical direction is smaller than the thickness of the outer wall 302 in the vertical direction, the depth H2 of the inner groove 701 can also be set to be less than the depth H3 of the outer groove 702. In other words, the depth H2 of the inner groove 701 and the depth H3 of the outer groove 702 can be determined according to the specific structure of the water-cooled plate 201 to be welded, so that the DCM-based water-cooled plate welding fixture can be fully fitted with the water-cooled plate 201 to be welded. No further restrictions are imposed here.

[0050] In some embodiments, the depth H3 of the external groove 702 ranges from 3.5mm to 4.5mm. In this embodiment, the depth H3 of the external groove 702 is 4mm. In other embodiments, the depth H3 of the external groove 702 can also be 3.8mm, 4.2mm or 4.6mm.

[0051] In some embodiments, the depth H2 of the internal groove 701 ranges from 4mm to 5mm. In this embodiment, the depth H2 of the internal groove 701 is 4.5mm. In other embodiments, the depth H2 of the internal groove 701 can also be 4.2mm, 4.6mm or 4.8mm.

[0052] In some embodiments, the thickness H4 of the main body plate 6 ranges from 4.5mm to 5.5mm. In this embodiment, the thickness H4 of the main body plate 6 is 5mm. In other embodiments, the thickness H4 of the main body plate 6 can also be 4.5mm or 5.5mm.

[0053] In some embodiments, please refer to Figure 9 The width W1 of the main body plate 6 is in the range of 50mm~60mm. In this embodiment, the width W1 of the main body plate 6 is 58.6mm. In other embodiments, the width W1 of the main body plate 6 can also be 52mm, 54mm or 56mm.

[0054] As an example, the length L1 of the main body plate 6 ranges from 60mm to 70mm. In this embodiment, the length L1 of the main body plate 6 is 63.6mm. In other embodiments, the length L1 of the main body plate 6 can also be 62mm, 64mm or 66mm.

[0055] As an example, the length L2 of the inner groove 701 region ranges from 40mm to 50mm. In this embodiment, the length L2 of the inner groove 701 is 63.6mm. In other embodiments, the length L2 of the inner groove 701 can also be 52mm, 54mm or 56mm.

[0056] It should be noted that this utility model Figure 5 This is merely an example of the shape of an auxiliary groove for a water-cooled plate, and is not intended to represent the entire invention. Figure 5 For limitation, in other examples, the auxiliary groove of the water-cooled plate can also adopt other shapes, and the auxiliary groove of the water-cooled plate can be set to fit into the flow groove on the water-cooled plate to be welded, depending on the requirements.

[0057] In summary, the DCM-packaged water-cooled plate welding fixture of this invention includes a main plate and a water-cooled plate auxiliary groove. The main plate has a first side and a second side facing away from each other. The water-cooled plate auxiliary groove is formed on the first side of the main plate. The shape of the water-cooled plate auxiliary groove corresponds to the shape of the flow protrusion on the water-cooled plate to be welded, which is used for the flow of coolant. The depth of the water-cooled plate auxiliary groove is the same as the height of the flow protrusion. When the main plate is connected to the water-cooled plate to be welded, the flow protrusion is fitted into the water-cooled plate auxiliary groove. The DCM-packaged water-cooled plate welding fixture of this invention can fill the gap between the water-cooled plate and the return tray, solving the problem of uneven heat transfer caused by the uneven structure of the water-cooled plate during the welding process, thereby improving the welding quality of the product and increasing the yield of the water-cooled plate welding process. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0058] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A welding fixture for a water-cooled plate based on DCM packaging, characterized in that, include: The main body panel includes a first side and a second side that are opposite to each other; A water-cooled plate auxiliary groove is formed on the first surface of the main body plate. The shape of the water-cooled plate auxiliary groove corresponds to the shape of the flow protrusion on the water-cooled plate to be welded for the flow of coolant. The depth of the water-cooled plate auxiliary groove is the same as the height of the flow protrusion. When the main plate is connected to the water-cooled plate to be welded, the flow groove is fitted into the auxiliary groove of the water-cooled plate.

2. The water-cooled plate welding fixture based on DCM packaging according to claim 1, characterized in that: The auxiliary groove of the water-cooled plate includes an inner groove and an outer groove that surrounds and communicates with the inner groove.

3. The water-cooled plate welding fixture based on DCM packaging according to claim 2, characterized in that: The horizontal plane where the external groove opening is located is the same as the horizontal plane where the first surface of the main body plate is located, and the horizontal plane where the internal groove opening is located is higher than the horizontal plane where the first surface of the main body plate is located.

4. The water-cooled plate welding fixture based on DCM packaging according to claim 2, characterized in that: The depth of the inner groove is greater than the depth of the outer groove.

5. The water-cooled plate welding fixture based on DCM packaging according to claim 2, characterized in that: The depth of the external groove ranges from 3.5mm to 4.5mm.

6. The water-cooled plate welding fixture based on DCM packaging according to claim 2, characterized in that: The depth of the internal groove ranges from 4mm to 5mm.

7. The water-cooled plate welding fixture based on DCM packaging according to claim 2, characterized in that: The length of the internal groove area ranges from 40mm to 50mm.

8. The water-cooled plate welding fixture based on DCM packaging according to claim 1, characterized in that: The thickness of the main plate ranges from 4.5mm to 5.5mm.

9. The water-cooled plate welding fixture based on DCM packaging according to claim 1, characterized in that: The width of the main body plate is in the range of 50mm to 60mm.

10. The water-cooled plate welding fixture based on DCM packaging according to claim 1, characterized in that: The length of the main plate is in the range of 60mm to 70mm.

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