Power module with integrated plastic shell

Abstract

The utility model relates to the technical field of module packaging, in particular to a power module with an integrated plastic shell. Comprising an integrated shell, and the integrated shell comprises an upper shell and a lower shell connected to the lower portion of the upper shell; the reinforcing ribs are arranged on the corner edges of the upper shell; and the power assembly is arranged in the cavity of the integrated shell. According to the utility model, the upper shell and the lower shell are designed into an integrated structure, so that the undesirable phenomenon caused by covering the upper cover is effectively prevented, the phenomenon that the upper cover is separated due to deformation of the power module in an extreme environment is effectively prevented through the reinforcing ribs, the production efficiency and the device performance are improved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of module packaging, in particular to a power module with an integrated plastic shell. Background Art

[0002] Power module types include power device chips such as insulated gate bipolar transistors, power field-effect transistors, thyristors and power diodes. The chips are combined into various basic circuit units in a certain direction and position. The individual chips are connected to form circuits through welding wires, and the finished power modules are formed through the protective packaging of silicone and injection molded shells. Power modules are widely used in industrial control fields such as electrical transmission and motor control, as well as drive control fields such as automotive drive and hybrid power, wind power, welding machines, and locomotive traction. They are mainly used in the power circuits of power electronic systems in these fields.

[0003] The shell and cover used in traditional power device packaging technology are separated. Figure 1 As shown, in the prior art, a snap-fit ​​structure 5 is provided between the upper cover and the outer shell of the power module. Due to the limitations of the snap-fit ​​structure 5, materials and processing errors, the snap-fit ​​may easily break and the upper cover may fall off due to interference fit, human error and other reasons during the installation of the upper cover. When the power module is operated in a humid, high-temperature and complex extreme environment, the outer shell may deform, resulting in a loose fit between it and the upper cover, or even detachment of the upper cover, directly exposing the interior of the power module to the harsh environment, causing the power module to suffer corrosion damage, thereby damaging the electrical performance of the power module and greatly reducing its service life. Utility Model Content

[0004] The purpose of this utility model is to provide a power module with an integrated plastic shell to solve the above technical problems;

[0005] Power module with integrated plastic housing, including:

[0006] An integrated housing, comprising an upper housing and a lower housing connected below the upper housing;

[0007] reinforcing ribs, provided on the corner edges of the upper shell;

[0008] The power component is arranged in the cavity of the integrated shell.

[0009] Preferably, the upper shell is provided with glue injection holes, and the glue injection holes are arranged symmetrically along the central axis of the upper shell.

[0010] Preferably, the reinforcing rib is L-shaped, and the bending angle of the reinforcing rib corresponds to the corner edge of the upper shell.

[0011] Preferably, the reinforcing ribs include a first reinforcing rib provided at the upper left corner of the upper shell, a second reinforcing rib provided at the upper right corner of the upper shell, a third reinforcing rib provided at the lower left corner of the upper shell, and a fourth reinforcing rib provided at the lower right corner of the upper shell.

[0012] Preferably, an anti-misalignment mounting hole is provided on a corner edge region of the lower shell, and a mounting guide step is provided on a side of the anti-misalignment mounting hole close to the upper shell.

[0013] Preferably, the power component includes:

[0014] a heat dissipation substrate, disposed on the lower housing;

[0015] The ceramic copper-clad plate is arranged on the heat dissipation substrate.

[0016] Preferably, the upper shell is provided with a plurality of holes and slots, and the holes and slots are circular slots; the ceramic copper-clad plate is provided with metal needles, and the metal needles are arranged through the holes and slots.

[0017] Preferably, the metal needle includes a needle seat connected to the ceramic copper-clad board and a needle body passing through the hole.

[0018] Preferably, a boss structure is provided at a corner edge of the lower shell, and one end of the boss structure abuts against a side surface of the heat dissipation substrate.

[0019] Preferably, a power chip is provided on the ceramic copper clad laminate, and the ceramic copper clad laminate and the power chip are connected via a metal wire.

[0020] The beneficial effects of the present invention are as follows: the present invention effectively prevents adverse phenomena caused by covering the cover by designing the upper shell and the lower shell as an integrated structure, and at the same time effectively prevents the power module from being deformed in extreme environments and causing the upper cover to detach, thereby improving production efficiency and device performance and extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a power module package in the prior art;

[0022] Figure 2 This is a schematic structural diagram of a power module with an integrated plastic housing according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a power component inside an integrated housing in an embodiment of the present utility model;

[0024] Figure 4 Schematic diagram of the structure of the metal needle in the embodiment of the present utility model.

[0025] In the accompanying drawings: 1. Integrated housing; 11. Upper housing; 12. Lower housing; 13. Anti-misalignment mounting hole; 14. Mounting guide step; 15. Reinforcing rib; 16. Hole groove; 17. Glue injection hole; 18. Boss structure; 2. Power component; 21. Heat dissipation substrate; 22. Ceramic copper clad laminate; 3. Metal needle; 31. Needle seat; 32. Needle body; 4. Power chip; 5. Snap-on structure; 6. Traditional mounting hole. DETAILED DESCRIPTION

[0026] 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 embodiments described are only 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 making creative efforts are within the scope of protection of the present invention.

[0027] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0028] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0029] Power modules with integrated plastic housing, such as Figures 2 to 4 Shown, including,

[0030] The integrated housing 1 includes an upper housing 11 and a lower housing 12 connected below the upper housing 11;

[0031] Reinforcement ribs 15 are provided on the corner edges of the upper shell 11;

[0032] The power component 2 is disposed in the cavity of the integrated housing 1 .

[0033] Specifically, the present invention provides a power module with an integrated plastic shell, which is a photovoltaic power module. By designing the upper shell 11 and the lower shell 12 as an integrated body to reduce the operation of covering the cover, it can effectively prevent the adverse phenomena caused by covering the cover. At the same time, the design of the reinforcing ribs 15 can effectively prevent the power module from deforming in extreme environments and causing the upper cover to detach, thereby greatly improving production efficiency and device yield and extending the service life of the device.

[0034] The integrated housing 1 is formed by injection molding. Figure 1 The shell and the upper cover in the prior art shown are matched with each other using a snap structure 5. The integrated shell 1 can prevent the upper cover from falling off due to the snap breakage during the installation of the upper cover, thereby effectively ensuring product quality.

[0035] In a preferred embodiment, the upper shell 11 is provided with glue injection holes 17 , and the glue injection holes 17 are symmetrically arranged along the central axis of the upper shell 11 .

[0036] Specifically, the upper shell 11 is provided with glue injection holes 17 that are symmetrical left and right but asymmetrical up and down, which can play a foolproof role during packaging and prevent the shell from being sealed upside down. The glue injection holes 17 are used for subsequent silicone injection.

[0037] In a preferred embodiment, the reinforcing rib 15 is L-shaped, and the bending angle of the reinforcing rib 15 corresponds to the corner edge of the upper shell 11 .

[0038] Specifically, L-shaped reinforcing ribs 15 are provided at the four corner edges of the upper shell 11, which can effectively prevent the shell from deforming when the power module is operated in a humid, high-temperature, and complex extreme environment, resulting in a loose fit between it and the upper cover, or even detachment of the upper cover.

[0039] In a preferred embodiment, the reinforcing rib 15 includes a first reinforcing rib arranged at the upper left corner of the upper shell 11, a second reinforcing rib arranged at the upper right corner of the upper shell 11, a third reinforcing rib arranged at the lower left corner of the upper shell 11, and a fourth reinforcing rib arranged at the lower right corner of the upper shell 11.

[0040] In a preferred embodiment, an anti-misalignment mounting hole 13 is provided on a corner edge region of the lower shell 12 , and a mounting guide step 14 is provided on a side of the anti-misalignment mounting hole 13 close to the upper shell 11 .

[0041] Specifically, the inner wall of the anti-dislocation installation hole 13 is provided with an installation guide step 14 of a certain height. Figure 1 The conventional mounting hole 6 in the prior art shown and the mounting guide step 14 can effectively prevent misalignment when installing the power module, ensuring the installation accuracy while also ensuring to a certain extent that the mounting screws do not damage the plastic shell.

[0042] In a preferred embodiment, the power component 2 includes:

[0043] The heat dissipation substrate 21 is provided on the lower housing 12;

[0044] The ceramic copper clad plate 22 is disposed on the heat dissipation substrate 21 .

[0045] Specifically, sealant is filled between the lower housing 12 and the heat sink substrate 21, effectively eliminating any small gaps between them and ensuring faster heat transfer from the heat sink substrate 21 to the lower housing 12. The higher the thermal conductivity of the sealant, the more it helps improve heat dissipation efficiency, lower component temperatures, and enhance overall performance and stability.

[0046] The filling effect of the sealant between the heat dissipation substrate 21 and the lower housing 12 can effectively alleviate the mechanical stress caused by external vibration or thermal expansion, thereby improving the mechanical reliability of the assembly.

[0047] In a preferred embodiment, a plurality of holes 16 are provided on the upper shell 11 , and the holes 16 are circular grooves; a metal needle 3 is provided on the ceramic copper clad plate 22 , and the metal needle 3 is arranged through the holes 16 .

[0048] In a preferred embodiment, the metal needle 3 includes a needle seat 31 connected to the ceramic copper-clad plate 22 and a needle body 32 passing through the hole 16 .

[0049] Specifically, the metal needle 3 is a round plated metal needle, and the size of the hole 16 is adapted to the metal needle 3. Compared with the plug-in plated metal needle used in the power module of the prior art, the production process used for the round plated metal needle is one-piece mold forming, and the needle seat 31 extends upward to produce the needle body 32, ensuring that the plated needle is integrated and there is no contact resistance; from a structural point of view, the thickness of the needle body 32 and the needle seat 31 have a certain degree of enhanced bending strength, and are not easy to deform during the production process.

[0050] Specifically, the holes 16 on the upper shell 11 are arranged in a rectangular array. Figure 1 The conventional method of opening a single specific slot in the upper cover can effectively cope with the complex and varied arrangement of the metal pins 3 on the ceramic copper clad board 22, thereby effectively reducing costs.

[0051] In a preferred embodiment, a boss structure 18 is provided at a corner edge of the lower housing 12 , and one end of the boss structure 18 abuts against a side surface of the heat dissipation substrate 21 .

[0052] Specifically, symmetrical boss structures 18 are provided at the four corner edges of the lower shell 12 , and the ends of the boss structures 18 abut against the side surface of the heat dissipation substrate 21 , which is sufficient to ensure the concentricity of the module shell and the heat dissipation substrate 21 after encapsulation.

[0053] In a preferred embodiment, a power chip 4 is provided on the ceramic copper clad board 22 , and the ceramic copper clad board 22 and the power chip 4 are connected via metal wires.

[0054] Specifically, the metal wire is aluminum wire, which is welded to the power chip 4 and the ceramic copper clad board 22. The ceramic copper clad board 22 is also provided with devices such as diodes. Solder is provided between the ceramic copper clad board 22 and the diodes and other devices. The ceramic copper clad board 22 is welded to the heat dissipation substrate 21 through high-temperature soldering.

[0055] The upper housing 11 of the present invention is higher than the lower housing 12, and there is a set height difference between the upper housing 11 and the lower housing 12. An installation space is provided between the upper housing 11 and the lower housing 12. The power component 2 is included in the installation space.

[0056] In summary, the present application provides a power module with an integrated plastic shell, in which the upper shell 11 and the lower shell 12 are designed as an integrated structure, and reinforcing ribs 15 are added, thereby reducing the operation of installing the upper cover and improving product production efficiency and device yield.

[0057] The above description is only a preferred embodiment of the present invention and does not limit the implementation method and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A power module with an integrated plastic housing, characterized in that: include, An integrated housing (1), comprising an upper housing (11) and a lower housing (12) connected below the upper housing (11); Reinforcing ribs (15) are provided on the corner edges of the upper shell (11); A power component (2) is arranged in the cavity of the integrated housing (1).

2. The power module with an integrated plastic shell according to claim 1, characterized in that: The upper shell (11) is provided with glue injection holes (17), and the glue injection holes (17) are arranged symmetrically along the central axis of the upper shell (11).

3. The power module with an integrated plastic shell according to claim 1, wherein: The reinforcing rib (15) is L-shaped, and the bending angle of the reinforcing rib (15) corresponds to the corner edge of the upper shell (11).

4. The power module with an integrated plastic shell according to claim 1, wherein: The reinforcing rib (15) comprises a first reinforcing rib provided at the upper left corner of the upper shell (11), a second reinforcing rib provided at the upper right corner of the upper shell (11), a third reinforcing rib provided at the lower left corner of the upper shell (11), and a fourth reinforcing rib provided at the lower right corner of the upper shell (11).

5. The power module with an integrated plastic shell according to claim 1, wherein: An anti-dislocation mounting hole (13) is provided on the corner edge area of ​​the lower shell (12), and a mounting guide step (14) is provided on a side of the anti-dislocation mounting hole (13) close to the upper shell (11).

6. The power module with an integrated plastic shell according to claim 1, wherein: The power component (2) comprises: A heat dissipation substrate (21) is provided on the lower housing (12); A ceramic copper-clad plate (22) is provided on the heat dissipation substrate (21).

7. The power module with an integrated plastic shell according to claim 6, characterized in that: The upper shell (11) is provided with a plurality of holes (16), and the holes (16) are circular grooves; the ceramic copper-clad plate (22) is provided with a metal needle (3), and the metal needle (3) is arranged through the holes (16).

8. The power module with an integrated plastic shell according to claim 7, characterized in that: The metal needle (3) comprises a needle seat (31) connected to the ceramic copper-clad plate (22) and a needle body (32) passing through the hole (16).

9. The power module with an integrated plastic shell according to claim 6, characterized in that: A boss structure (18) is provided at the corner edge of the lower shell (12), and one end of the boss structure (18) abuts against the side surface of the heat dissipation substrate (21).

10. The power module with an integrated plastic shell according to claim 6, characterized in that: A power chip (4) is provided on the ceramic copper-clad plate (22), and the ceramic copper-clad plate (22) and the power chip (4) are connected via a metal wire.

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