Power module fixing tool

Abstract

The utility model provides a power module fixing tool, which relates to the power module packaging technology and comprises a glue pouring jig, a plurality of placing cavities are arranged on the upper surface of the glue pouring jig, glue pouring ports are arranged at the bottoms of the placing cavities in a penetrating manner, and a plurality of pin holes are vertically arranged on the glue pouring jig in a penetrating manner; a plurality of sets of sliding holes are formed in the auxiliary jig in a penetrating mode, the set number of the sliding holes is matched with the number of the containing cavities, sliding rods are movably arranged in the sliding holes in a penetrating mode, positioning pins matched with the pin holes in number and position are vertically arranged on the lower surface of the auxiliary jig, and the positioning pins are used for being matched with the pin holes respectively. And each group of sliding holes are positioned right above the placing cavities in a one-to-one correspondence manner. And the device can adapt to each operation process and has relatively high practicability.

Description

Technical Field

[0001] This application relates to power module packaging technology, specifically to a power module fixing fixture. Background Technology

[0002] After wire bonding, the power module needs to be assembled using a housing. The housing is first coated with adhesive using a glue applicator, then the housing and power module are assembled and bonded together. After assembly, it needs to be baked in a nitrogen oven. After baking, silicone gel is injected into the housing using a dispensing machine to cover the chip and aluminum wires, providing waterproof protection. After silicone gel injection, it is then baked in a vertical oven. Because this involves four work processes, each process requires a fixed fixture. During the changeover process, the product needs to be frequently switched between different fixtures, requiring a significant number of personnel. Furthermore, the manual handling of the product during the changeover process can easily affect product quality. Utility Model Content

[0003] To address the aforementioned deficiencies in existing technologies, this application provides a power module fixing fixture that can adapt to various operational processes and has strong practicality.

[0004] To achieve the above objectives, the present invention employs the following technology:

[0005] A power module fixing fixture, comprising:

[0006] The glue-filling fixture has multiple placement cavities on its upper surface, and each placement cavity has a glue-filling port at the bottom. The glue-filling fixture also has multiple pin holes vertically penetrating through it.

[0007] The auxiliary fixture has multiple sets of sliding holes, the number of which matches the number of placement cavities. Each sliding hole has a sliding rod that moves through it. The lower surface of the auxiliary fixture has a number of positioning pins that match the pin holes. The positioning pins are used to engage with the pin holes. When the positioning pins engage with the pin holes, each set of sliding holes is located directly above the placement cavity.

[0008] Furthermore, each end of the slide rod extending out of the lower surface of the auxiliary fixture is coaxially connected to a contact terminal, and a spring is coaxially sleeved on the outer side of the slide rod. The two ends of the spring are respectively connected to the contact terminal and the lower surface of the auxiliary fixture. When the positioning pins are engaged with the pin holes and the springs are in their original state, the distance between the contact terminal and the bottom of the placement cavity is a predetermined value.

[0009] Furthermore, each end of the lower surface of the auxiliary fixture is provided with two rotating seats, and a rotating head is rotatably connected to each rotating seat. The rotating heads located at the same end of the auxiliary fixture rotate coaxially with the rotation axis parallel to the width direction of the auxiliary fixture. Each rotating head is connected to a rotating plate, and a linkage rod is connected between the rotating plates located at the same end of the auxiliary fixture. A protrusion is connected to the end of the rotating plate away from the rotating head. Both ends of the glue-filling fixture are provided with mating ports, and each mating port is provided with a mating plate parallel to the upper surface of the glue-filling fixture. When the positioning pins are respectively engaged with the pin holes, the distance between the protrusion and its rotation axis matches the distance between the mating plate and the rotation axis.

[0010] The beneficial effects of this utility model are as follows:

[0011] 1. This fixed fixture can meet the needs of four work processes, avoiding the need to change products between different fixed fixtures, simplifying the entire work process; it also reduces the number of workers, saves costs, and avoids manual contact with the product, thus improving product quality.

[0012] 2. The spring ensures a tighter contact between the power module and the housing, enhancing the seal and reducing glue leakage during potting due to poor sealing; the front end of the support spring has a rubber terminal, which protects the surface of the power module when in contact with it.

[0013] 3. By utilizing the fit between the pin hole and the positioning pin, and the fit between the protrusion and the mating plate, the glue-dispensing fixture and the auxiliary fixture are tightly integrated, thereby improving the stability of the fixed fixture. Attached Figure Description

[0014] Figure 1 This is a three-dimensional schematic diagram of the power module fixing fixture according to an embodiment of this application.

[0015] Figure 2 This is a three-dimensional schematic diagram of the glue-pouring fixture according to an embodiment of this application.

[0016] Figure 3 This is a three-dimensional schematic diagram of the auxiliary fixture according to an embodiment of this application.

[0017] Figure 4 This is a partial exploded view of the power module fixing fixture in operation according to an embodiment of this application.

[0018] Figure 5 This is a partial three-dimensional schematic diagram of the contact between the protrusion and the mating plate in an embodiment of this application.

[0019] The markings in the diagram are: 1-potting fixture, 11-placement cavity, 12-potting port, 13-pin hole, 14-mating port, 15-mating plate, 2-auxiliary fixture, 21-sliding hole, 22-sliding rod, 23-positioning pin, 24-contact terminal, 25-spring, 26-rotating seat, 27-rotating head, 28-rotating plate, 29-linkage rod, 210-protrusion, 3-power module, 31-housing shell, 32-placement groove, 33-potting hole. Detailed Implementation

[0020] To make the objectives, technical solutions and advantages of the present utility model clearer, the implementation methods of the present utility model will be described in detail below with reference to the accompanying drawings. However, the embodiments described in the present utility model are only some embodiments of the present utility model, and not all embodiments.

[0021] like Figure 1 As shown, this embodiment provides a power module fixing fixture, including a potting fixture 1 and an auxiliary fixture 2.

[0022] Specifically, such as Figure 4 As shown, the fixing fixture is used to fix the power module 3 to the housing 31. The upper surface of the housing 31 has an opening, and the edge of the opening has a placement groove 32 for placing the power module 3. The lower surface of the housing 31 has a through-hole 33 for filling the housing 31 with glue. Since the housing 31 and the power module 3 are existing technologies, they will not be described in detail here.

[0023] Specifically, such as Figure 2 and Figure 4 As shown, the glue-filling fixture 1 is in the shape of a rectangular plate, and a plurality of rectangular placement cavities 11 are provided on its upper surface. The size of the placement cavities 11 matches that of the housing 31. Each placement cavity 11 has a glue-filling port 12 through it at the bottom, and each of the four corners of the glue-filling fixture 1 has a pin hole 13 through it.

[0024] Specifically, such as Figure 3 and Figure 4 As shown, the auxiliary fixture 2 is in the shape of a rectangular plate with multiple sets of sliding holes 21 running through it. The number of sets of sliding holes 21 matches the number of placement cavities 11. Sliding rods 22 are movably inserted into each sliding hole 21. Positioning pins 23 are vertically provided at the four corners of the lower surface of the auxiliary fixture 2. The positioning pins 23 are used to cooperate with the pin holes 13. When the positioning pins 23 cooperate with the pin holes 13, each set of sliding holes 21 is located directly above the placement cavity 11. More specifically, in this example, a set of sliding holes 21 includes four sliding holes 21, and when the positioning pins 23 cooperate with the pin holes 13, the four sliding holes 21 in the same set are located directly above the four corners of their corresponding placement cavities 11.

[0025] During operation, the outer casing 31 is placed in the placement cavity 11 with the placement groove 32 of the outer casing 31 facing upwards; the glue-applying fixture 1 is placed on the glue-applying machine, and the glue-applying machine is used to apply sealant to the placement groove 32 of the outer casing 31; the wire-bonded power module 3 is placed on the placement groove 32; the auxiliary fixture 2 is inverted on the surface of the glue-applying fixture 1, so that the positioning pin 23 engages with the pin hole 13; the slide rod 22 is moved so that the slide rod 22 contacts the power module 3, and the power module 3 is pressed down so that it is in close contact with the outer casing 31, at which point the sealant fills the cavity. Place the sealant in groove 32 to complete the sealing; place the combined potting fixture 1 and auxiliary fixture 2 into a nitrogen chamber for baking to solidify the sealant at high temperature; after baking, place the potting fixture 1 on top and the auxiliary fixture 2 on the bottom, and place the combined potting fixture 1 and auxiliary fixture 2 into a vacuum chamber. The injection head injects a mixture of silicone gel and catalyst into the housing 31 in a 1:1 ratio through the injection port 12 and injection hole 33; after injection, place the combined potting fixture 1 and auxiliary fixture 2 into a vertical furnace for baking. After baking, remove the product.

[0026] Preferred, such as Figure 4 As shown, each end of the slide rod 22 extending out of the lower surface of the auxiliary fixture 2 is coaxially connected to a contact terminal 24, which may be made of rubber. Springs 25 are coaxially sleeved on the outer periphery of the slide rod 22. The two ends of the springs 25 are respectively connected to the contact terminals 24 and the lower surface of the auxiliary fixture 2. When the positioning pins 23 are engaged with the pin holes 13 and the springs 25 are in their original state, the distance between the contact terminals 24 and the bottom of the placement cavity 11 is a predetermined value. This predetermined value is used to ensure that when the positioning pins 23 are engaged with the pin holes 13, the contact terminals 24 are in contact with the power module 3 and the springs 25 are compressed. The contact terminals 24 can tightly press the power module 3, making the connection between the power module 3 and the housing 31 more compact.

[0027] Preferred, such as Figure 5As shown, the auxiliary fixture 2 has two rotating seats 26 at both ends of its lower surface. A rotating head 27 is rotatably connected to each rotating seat 26. The rotating heads 27 at the same end of the auxiliary fixture 2 rotate coaxially with their rotation axes parallel to the width direction of the auxiliary fixture 2. Each rotating head 27 is connected to a rotating plate 28. A linkage rod 29 is connected between the rotating plates 28 at the same end of the auxiliary fixture 2. A protrusion 210 is connected to the end of the rotating plate 28 away from the rotating head 27. The glue-filling fixture 1 has mating ports 14 at both ends. Each mating port 14 has a mating plate 15 parallel to the upper surface of the glue-filling fixture 1. When the positioning pin 23 mates with the pin hole 13... When the mating plates are engaged, the distance between the protrusion 210 and its rotating shaft matches the distance between the mating plate 15 and the rotating shaft. This matching means that when the positioning pin 23 engages with the pin hole 13, rotating the rotating head 27 allows the protrusion 210 to enter the space between the mating plate 15 and the lower surface of the glue-filling fixture 1 within the mating opening 14. The protrusion 210 can also make close contact with the mating plate 15, firmly securing the glue-filling fixture 1 and making the engagement between the glue-filling fixture 1 and the auxiliary fixture 2 more stable. More preferably, the contact surface between the protrusion 210 and the mating plate 15 can be set as an inclined surface to make it easier for the protrusion 210 to contact the mating plate 15.

[0028] The above description is only a preferred embodiment of this application and is not intended to limit this application. Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application.

Claims

1. A power module fixing tool characterized by, include: The glue-filling fixture (1) has multiple placement cavities (11) on its upper surface. Each placement cavity (11) has a glue-filling port (12) through its bottom. The glue-filling fixture (1) has multiple pin holes (13) through its vertical surface. The auxiliary fixture (2) has multiple sets of sliding holes (21) through it. The number of sets of sliding holes (21) matches the number of placement cavities (11). Sliding rods (22) are moved through each sliding hole (21). The lower surface of the auxiliary fixture (2) is vertically provided with a number of positioning pins (23) that match the pin holes (13). The positioning pins (23) are used to cooperate with the pin holes (13). When the positioning pins (23) cooperate with the pin holes (13), each set of sliding holes (21) is located directly above the placement cavity (11).

2. The power module fixture of claim 1, wherein, One end of the slide rod (22) extending out of the lower surface of the auxiliary fixture (2) is coaxially connected to a contact terminal (24). A spring (25) is coaxially sleeved on the outer side of the slide rod (22). The two ends of the spring (25) are respectively connected to the contact terminal (24) and the lower surface of the auxiliary fixture (2). When the positioning pin (23) is engaged with the pin hole (13) and the spring (25) is in its original state, the distance between the contact terminal (24) and the bottom of the placement cavity (11) is a predetermined value.

3. The power module fixture of claim 1, wherein, Two rotating seats (26) are provided at both ends of the lower surface of the auxiliary fixture (2). A rotating head (27) is rotatably connected inside the rotating seat (26). The rotating heads (27) located at the same end of the auxiliary fixture (2) rotate coaxially and the rotating axis is parallel to the width direction of the auxiliary fixture (2). The rotating heads (27) are connected to rotating plates (28). A linkage rod (29) is connected between the rotating plates (28) located at the same end of the auxiliary fixture (2). A protrusion (210) is connected to the end of the rotating plate (28) away from the rotating head (27). Both ends of the glue-filling fixture (1) are provided with mating ports (14). A mating plate (15) parallel to the upper surface of the glue-filling fixture (1) is provided inside the mating ports (14). When the positioning pin (23) is mated with the pin hole (13), the distance between the protrusion (210) and its rotating axis matches the distance between the mating plate (15) and the rotating axis.

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