Pressing device for double-sided water-cooling power module aging test equipment

Abstract

A pressing device for double-sided water-cooling power module aging test equipment comprises a pressing water-cooling mechanism, a crimping suite, a water-cooling plate and a tray, and the pressing water-cooling mechanism firmly presses a power module to be tested by means of elastic force through cooperative work of a fixing terminal and a pressing terminal. The water cooling plate is connected with cooling water circulation through a water inlet and a water outlet so as to take away heat generated in the testing process, the crimping suite changes the crimping force of the crimping terminal on the power terminal of the tested module by adjusting the position of a nut, the water cooling plate is made of a high-thermal-conductivity metal material, and a telescopic heat-conducting interface material is attached to the water cooling plate. The micro gap between the water cooling plate and the power module to be tested is filled, the thermal resistance is reduced, and the heat conduction efficiency is improved. According to the utility model, the problems of compression and heat dissipation in the test of the double-sided water-cooling power module are solved, the test efficiency is remarkably improved through the highly automatic design, and a more efficient and reliable solution is provided for the aging test of the double-sided water-cooling power module.

Description

Technical Field

[0001] This utility model relates to power semiconductor devices, and in particular to a clamping device for aging test equipment of double-sided water-cooled power modules. Background Technology

[0002] With the rapid development of modern society in fields such as new energy power generation, electric vehicles, rail transit, data centers, energy storage, and charging piles, the demand for power electronic equipment has increased dramatically. Among these, the reliability of power electronic devices has become a key factor in ensuring stable system operation. In particular, third-generation power semiconductor devices and domestically produced power semiconductor devices face challenges in chip technology, manufacturing processes, and other aspects, urgently requiring rigorous pre-production testing and screening to ensure their reliability and safety in end-user applications.

[0003] Especially in fields with extremely high reliability requirements, such as electric vehicles and grid-connected devices, the demand for power module operating condition simulation testing has increased significantly in recent years. However, existing technical solutions have obvious shortcomings in addressing this demand:

[0004] Current power module testing equipment primarily relies on pneumatic or electric methods to achieve tight contact between external conductive terminals and the power and signal terminals of the power module. Simultaneously, pneumatic or electric external insulating terminals ensure the water-air tightness of the heat dissipation substrate, allowing for power-on and water-through testing. While this testing process achieves a degree of automation, it falls short when dealing with double-sided water-cooled power modules. Double-sided water-cooled power modules employ a copper substrate heat dissipation structure on both sides. Traditional direct water contact with the copper substrate is unsuitable for this type of heat conduction, necessitating an innovative solid-state contact heat conduction solution to accommodate this double-sided heat dissipation structure.

[0005] Furthermore, existing testing equipment also suffers from significant deficiencies in thermal conductivity. Due to limitations in actual manufacturing processes, both the copper substrate heat dissipation surface of the power module and the copper heat dissipation surface used for compression contact have certain flatness tolerances. This tolerance leads to increased thermal resistance during the compression contact heat conduction process, thereby affecting the heat transfer within the power module and significantly impacting the testing performance and accuracy of the testing equipment.

[0006] Therefore, existing technical solutions have significant shortcomings in adapting to the testing of double-sided water-cooled power modules and improving thermal conductivity, and an innovative testing solution is urgently needed to solve these problems. Utility Model Content

[0007] To overcome the shortcomings of the prior art, this utility model provides a clamping device for aging test equipment of double-sided water-cooled power modules, solving the problems of clamping and heat dissipation in the testing of double-sided water-cooled power modules.

[0008] The technical solution of this utility model is as follows:

[0009] A clamping device for an aging test equipment for double-sided water-cooled power modules, characterized in that it includes:

[0010] N sets of downward pressure water cooling mechanisms, each set of downward pressure water cooling mechanisms includes a fixed terminal and a clamping terminal. The clamping terminal has a clamping end face at the bottom and an inlet and outlet on the outside. The clamping terminal and the fixed terminal work together to clamp the power module under test through elastic force. The inlet and outlet are used to connect to the cooling water circulation to remove the heat generated during the test. The clamping end face is used to directly contact one of the heat dissipation surfaces of the power module under test to transfer heat.

[0011] The 3N crimping kit includes a crimping terminal, a conductive flexible busbar, an insulating end, a nut, a spring, and a stud. The crimping terminal is used to press against the power terminal of the module under test to ensure electrical connection. The conductive flexible busbar is used to connect the crimping terminal to other circuit parts. The insulating end is used to protect the crimped connection. The nut, spring, and stud work together to change the crimping force of the crimping terminal by adjusting the position of the nut.

[0012] A water-cooled plate set, the water-cooled plate including a water-cooled plate base and a stretchable thermally conductive interface material attached to the protruding surface of the water-cooled plate base, and an inlet and outlet pipe connected to the inlet and outlet of the water-cooling mechanism. The water-cooled plate base is made of a metal material with high thermal conductivity. The stretchable thermally conductive interface material is used to fill the tiny gap between the water-cooled plate and the power module under test to reduce thermal resistance.

[0013] The water-cooled plate serves as a fixed component for placing the power module. The downward-pressing water-cooling mechanism moves up and down via an upper pneumatic or electric device, and the pressing kit moves back and forth via a horizontal pneumatic or electric device. When the downward-pressing water-cooling mechanism presses down and the pressing kit moves horizontally, it presses against the vertical heat dissipation surface and the side power end face of the power module, respectively. Wherein, 1 ≤ N ≤ 9, preferably N = 3.

[0014] Furthermore, it also includes a tray for quickly transporting the power module under test.

[0015] Furthermore, the three sets of downward water-cooling mechanisms work together to firmly press the power module under test between the pressing end face and the water-cooling plate (3) using the elastic force between the pressing terminal and the fixed terminal.

[0016] Furthermore, a stretchable thermally conductive interface material is attached to the underside of the pressing end face.

[0017] Furthermore, the stretchable thermal interface material has thermal conductivity and elasticity to ensure that heat can be efficiently conducted from the power module to the water cooling mechanism and heat dissipation system.

[0018] Furthermore, by adjusting the position of the nut on the stud, the crimping force of the spring on the crimp terminal can be controlled to ensure that the crimp terminal is in close contact with the power terminal of the module under test, thereby achieving a reliable electrical connection.

[0019] Furthermore, the testing equipment also includes an automated control system for automatically performing power-on tests, controlling the downward water-cooling mechanism to rise after the test is completed, and quickly transporting the power module under test through the tray to achieve continuous and efficient testing.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] 1) This design combines two main functions: compression and heat dissipation. Three sets of downward-pressing water-cooling mechanisms work together, utilizing the elasticity between the compression terminals and the fixed terminals to achieve a secure clamping of the power module under test. Simultaneously, the expandable thermally conductive interface material beneath the compression end face and the corresponding material on the water-cooling plate effectively fill the tiny gaps, ensuring efficient heat transfer from the power module to the water-cooling mechanism and heat dissipation system. This integrated design not only solves the compression problem in testing double-sided water-cooled power modules but also significantly improves heat dissipation efficiency.

[0022] 2) By using nuts, springs, and studs, the crimping force of the crimp terminals on the power terminals of the module under test can be flexibly adjusted. This adjustment mechanism ensures tight contact between the crimp terminals and the power terminals, achieving a reliable electrical connection. At the same time, it avoids damage to the power terminal face caused by excessive tightening, improving the accuracy and stability of the test.

[0023] 3) The water-cooled plate base is made of a metal material with high thermal conductivity, ensuring excellent heat dissipation performance. The selection of a stretchable thermal interface material not only has good thermal conductivity but also a certain degree of flexibility, which can adapt to power modules of different sizes under test, further improving heat dissipation efficiency.

[0024] 4) Solid-state contact heat conduction method applicable to double-sided copper substrate heat dissipation surface, which improves the problem of difficult heat conduction in close contact between the copper substrate heat dissipation surface of the power module and the copper heat dissipation surface used for pressing and contacting the copper substrate for heat dissipation. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of an embodiment of the clamping device for a double-sided water-cooled power module aging test equipment according to the present invention.

[0026] Figure 2This is a side view of an embodiment of the clamping device for a double-sided water-cooled power module aging test equipment according to the present invention.

[0027] Figure 3 This is a schematic diagram of the downward pressure water cooling mechanism in this utility model.

[0028] Figure 4 This is a top view of the downward pressure water cooling mechanism in this utility model.

[0029] Figure 5 This is a schematic diagram of the crimping kit in this utility model.

[0030] Figure 6 This is a schematic diagram of the structure of the water-cooled plate in this utility model.

[0031] Figure 7 This is a schematic diagram of the structure of the tray in this utility model.

[0032] In the figure: 1 - Downward pressure water cooling mechanism; fixed terminal 11, clamping terminal 12, water inlet and outlet 13, clamping end face 14, stretchable thermally conductive interface material 15;

[0033] 2-Crimping kit; crimp terminal 21, conductive flexible busbar 22, insulating end 23, nut 24, spring 25, stud 26;

[0034] 3-Water-cooled plate; Water-cooled plate base 31, Stretchable thermally conductive interface material 32, Inlet and outlet pipes 33;

[0035] 4-Tray. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the scope of protection of the present invention.

[0037] Please see Figure 1 , Figure 1 This is a schematic diagram of a pressing device embodiment for a double-sided water-cooled power module aging test equipment according to this utility model. As shown in the figure, N is 3 in this embodiment, specifically including three sets of pressing water-cooling mechanisms 1, six sets of pressing kits 2, a tray 4, and a set of water-cooling plates 3. These components work together to ensure stable pressing and efficient heat dissipation of the module during the test. Its structure and function are as follows:

[0038] Downward-pressure water cooling mechanism 1 includes:

[0039] Fixed terminal 11: As a fixed part of the water cooling mechanism, it is used for support and positioning.

[0040] Clamping terminal 12: Works in conjunction with the fixed terminal to clamp the power module under test through elastic force.

[0041] Inlet / outlet 13: Used to connect the inlet and outlet of the cooling water circulation to the clamping terminal to remove the heat generated during the test.

[0042] Clamping end face 14: Used to directly contact one of the heat dissipation surfaces of the power module under test to transfer heat.

[0043] 15. Scalable thermally conductive interface material: It is attached to the underside of the pressing end face to ensure effective heat conduction even in the presence of small gaps, thereby reducing thermal resistance.

[0044] Crimping kit 2 includes:

[0045] Crimp terminal 21: Used to press into contact with the power terminal of the module under test to ensure electrical connection.

[0046] Conductive flexible busbar 22: Used to connect crimp terminals and other circuit parts, maintaining good conductivity;

[0047] Insulating end 23: Used to protect the crimped connection, ensure electrical safety, and prevent short circuits.

[0048] Nut 24, spring 25, and stud 26 work together to adjust the crimping force by changing the nut's position to accommodate power terminals of different sizes. When nut 24 moves outward or inward along stud 26, it compresses or releases spring 25, thereby changing the force applied by the spring to crimp terminal 21. Appropriate crimping force ensures good contact between the crimp terminal and the power terminal while avoiding damage to the power terminal face due to over-tightening.

[0049] Water-cooled plate 3 includes:

[0050] Water-cooled plate base 31: Typically made of a metal material with high thermal conductivity (such as copper or aluminum) to ensure good heat dissipation performance. The water-cooled plate base 31 has a raised surface for close contact with heat-generating components such as the power module under test, improving heat conduction efficiency.

[0051] The expandable thermally conductive interface material 32 is a polymer composite material with good thermal conductivity and a certain degree of elasticity. It is attached to the protruding surface of the water-cooled plate base 31 to fill the tiny gap between the water-cooled plate and the power module under test, reduce thermal resistance, and improve heat transfer efficiency.

[0052] Inlet / outlet pipes 33: Connected to the inlet / outlet of the pressure-reducing water cooling mechanism to form a complete cooling circuit. The coolant (usually pure water or other low-corrosion liquid) circulates inside the water-cooling plate through the inlet / outlet pipes, absorbing and carrying away heat.

[0053] Tray 4: Used for quick transport of power modules under test, simplifying the testing process and improving efficiency.

[0054] Working principle of this utility model

[0055] Compression and Heat Dissipation: Through pneumatic or electric control, three sets of downward water-cooling mechanisms work together, using the elasticity between the compression terminals and the fixed terminals to firmly press the power module under test between the compression end face and the water-cooling plate. At the same time, a stretchable thermally conductive interface material fills the tiny gaps, ensuring that heat can be efficiently conducted from the power module to the water-cooling mechanism and heat dissipation system.

[0056] Electrical connection: The crimping kit changes the crimping force by adjusting the position of the nut, ensuring that the crimped terminal makes tight contact with the power terminal of the module under test, thus achieving a reliable electrical connection.

[0057] Test Procedure: At the start of the test, the equipment automatically performs a power-on test. After the test is completed, the water-cooling mechanism rises, and the tray quickly transports the module under test, removing the tested module and placing a new module under test. This process is repeated to achieve continuous and efficient testing.

[0058] This invention not only solves the pressing and heat dissipation problems in the testing of double-sided water-cooled power modules, but also improves testing efficiency through a highly automated design. The stretchable thermally conductive interface material and the flexible pressing adjustment mechanism together constitute a powerful and easy-to-operate testing solution.

Claims

1. A clamping device for an aging test equipment for double-sided water-cooled power modules, characterized in that, include: N sets of downward pressure water cooling mechanisms (1), each set of downward pressure water cooling mechanisms (1) includes a fixed terminal (11) and a clamping terminal (12). The clamping terminal (12) has a clamping end face (14) at the bottom and an inlet / outlet (13) on the outside. The clamping terminal (12) and the fixed terminal (11) work together to clamp the power module under test by elastic force. The inlet / outlet (13) is used to connect the cooling water circulation to remove the heat generated during the test. The clamping end face (14) is used to directly contact one of the heat dissipation surfaces of the power module under test to transfer heat. 3N sets of crimping kits (2), each set of crimping kits (2) includes crimping terminals (21), conductive flexible strips (22), insulating ends (23), nuts (24), springs (25) and studs (26). The crimping terminals (21) are used to press against the power terminals of the module under test to ensure electrical connection. The conductive flexible strips (22) are used to connect the crimping terminals (21) and other circuit parts. The insulating ends (23) are used to protect the crimped connection. The nuts (24), springs (25) and studs (26) are used together to change the crimping force of the crimping terminals (21) by adjusting the position of the nuts (24). A water-cooled plate (3) includes a water-cooled plate base (31) and a second stretchable thermally conductive interface material (32) attached to the protrusion surface of the water-cooled plate base (31), as well as an inlet and outlet pipe (33) connected to the inlet and outlet of the water-cooling mechanism. The water-cooled plate base (31) is made of a metal material with high thermal conductivity. The second stretchable thermally conductive interface material (32) is used to fill the tiny gap between the water-cooled plate (3) and the power module under test to reduce thermal resistance. The water-cooled plate (3) serves as a fixed component for placing the power module. The downward water-cooling mechanism (1) moves up and down via an upper pneumatic or electric device, and the pressing kit (2) moves back and forth via a horizontal pneumatic or electric device. When the downward water-cooling mechanism (1) presses down and the pressing kit (2) moves horizontally, it presses against the vertical heat dissipation surface and the side power end face of the power module, respectively.

2. The clamping device according to claim 1, characterized in that, It also includes a tray (4) for quick transport of the power module under test.

3. The clamping device according to claim 1, characterized in that, The N groups of downward water-cooling mechanisms (1) work together to firmly press the power module under test between the pressing end face (14) and the water-cooling plate (3) by utilizing the elastic force between the pressing terminal (12) and the fixed terminal (11).

4. The clamping device according to claim 1, characterized in that... A first stretchable thermally conductive interface material (15) is attached to the underside of the pressing end face (14).

5. The clamping device according to claim 1, characterized in that, The first stretchable thermal interface materials (15) and (32) have thermal conductivity and elasticity to ensure that heat can be efficiently conducted from the power module to the water cooling mechanism and heat dissipation system.

6. The clamping device according to claim 1, characterized in that, By adjusting the position of the nut (24) on the stud (26), the crimping force of the spring (25) on the crimp terminal (21) can be controlled to ensure that the crimp terminal (21) is in close contact with the power terminal of the module under test, thereby achieving a reliable electrical connection.

7. The clamping device according to any one of claims 1-6, characterized in that, The testing equipment also includes an automated control system, which is used to automatically perform power-on tests, and after the test is completed, control the downward water-cooling mechanism (1) to rise, and quickly transport the power module under test through the tray (4) to achieve continuous and efficient testing.

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