A power terminal adaptive crimping device for power module test equipment

Abstract

The utility model relates to a kind of power end self-adapting crimping device for power module testing equipment, including lower mechanism, crimping mechanism, crimping mechanism includes DC power terminal crimping self-adapting adjustment component and AC power terminal crimping self-adapting adjustment component;DC power terminal crimping self-adapting adjustment component and the AC power terminal crimping self-adapting adjustment component respectively are provided with shock absorber being arranged below crimping mechanism lower stroke and elastic compression structure being arranged above shock absorber;The first stage shock absorber of crimping mechanism lower provides buffer and angle compensation, the second stage compression elastic compression structure of lower makes the conductive crimping component of crimping mechanism and the power terminal of the equipment to be measured closely contact and form conductive connection.The utility model can realize that crimping mechanism can automatically adapt the height and contact surface deviation of the power terminal of the power module to be measured during lower process, realize the flat crimping of power terminal, reliable conduction and fast reset.

Description

Technical Field

[0001] This utility model relates to the technical field of electronic power device testing and automated testing equipment, specifically to a power end adaptive crimping device for power module testing equipment. Background Technology

[0002] With the increasing demand for power electronic equipment in fields such as new energy power generation, electric vehicles, rail transit, data centers, energy storage, and charging piles, the reliability requirements for power semiconductor devices and power modules, as their core components, are constantly increasing. In particular, third-generation power semiconductor devices, represented by silicon carbide (SiC) and gallium nitride (GaN), as well as domestically produced power semiconductor devices, are currently undergoing technological iteration, process improvement, and product quality enhancement. They require rigorous electrical performance testing, operating condition simulation testing, and screening testing before leaving the production line to ensure reliability and safety in end-use applications. Power modules typically include DC power terminals and AC power terminals. During automated testing, the testing equipment needs to establish stable, low-resistance, and repeatable electrical connections with these power terminals through conductive terminals. Simultaneously, it should avoid causing indentations, scratches, or localized deformation to the power terminal surfaces to meet subsequent appearance quality acceptance and batch testing requirements.

[0003] Currently, automated equipment for testing finished power modules typically uses pneumatic or electric actuators to drive external conductive terminals downwards during power terminal crimping. This presses the external conductive terminals against the surface of the power terminals on the module under test, followed by an electrical test. After the test, the actuator lifts the conductive terminals, removes the module, and proceeds to the next test. Existing technology relies heavily on the downward pressure of the actuator and the precision of installation and adjustment during crimping. There is a lack of an automatically compensating floating structure between the conductive and power terminals. When there are parallelism errors, angular deviations, or height differences between the contact surfaces of the conductive and power terminals, the crimping force concentrates in a localized area. Repeated testing over a long period can easily lead to uneven wear on the contact surfaces and indentations on the power terminal surface. To address these issues, existing equipment usually adjusts the installation height and parallelism of the conductive terminals by adding or replacing shims. However, this adjustment method is inefficient, has poor repeatability, and requires repeated maintenance and adjustments during long-term operation or when changing modules. Summary of the Invention

[0004] To address the aforementioned technical problems, this utility model provides a power-end adaptive crimping device for power module testing equipment. Through the cooperation of the pressing mechanism and the crimping mechanism, and with the help of the shock absorber and elastic clamping structure of the crimping mechanism, the crimping device can provide floating buffer and angle compensation in the initial stage of crimping, reduce local hard contact, achieve stable and recoverable crimping force, reduce equipment maintenance and debugging time, and reduce the impact on appearance quality.

[0005] The technical objective of this utility model is achieved through the following technical solution:

[0006] An adaptive power terminal crimping device for a power module testing equipment includes a pressing mechanism and a crimping mechanism. The crimping mechanism includes a DC power terminal crimping adaptive adjustment component corresponding to the DC power terminal of the power module under test and an AC power terminal crimping adaptive adjustment component corresponding to the AC power terminal of the power module under test.

[0007] The DC power terminal crimping adaptive adjustment component and the AC power terminal crimping adaptive adjustment component are respectively provided with a shock absorber located below the crimping mechanism's pressing stroke and an elastic clamping structure located above the shock absorber; the crimping mechanism has two pressing stages under the driving of the pressing mechanism. In the first pressing stage, the shock absorber provides buffering and angle compensation, and in the second pressing stage, the elastic clamping structure is compressed so that the conductive connection component of the crimping mechanism makes tight contact with the power terminal of the device under test to form a conductive connection.

[0008] Furthermore, the voltage-conducting connection component includes a DC voltage-conducting connection component installed below the damper of the DC power terminal press-fit adaptive adjustment component and an AC voltage-conducting connection component installed below the damper of the AC power terminal press-fit adaptive adjustment component.

[0009] Furthermore, the elastic clamping structure of the DC power terminal crimping adaptive adjustment component includes a first spring, a first spring sleeve, a first clamping shaft, and a first cylindrical pin. The first spring is inserted into the first spring sleeve from below. The first clamping shaft passes through the first spring sleeve and abuts against the first spring from below. The first cylindrical pin is coaxially arranged in the middle section of the first clamping shaft and has a diameter larger than that of the first clamping shaft. The inner wall of the first spring sleeve is provided with a first limiting channel that slides with the outer wall of the first cylindrical pin.

[0010] The elastic clamping structure of the AC power terminal crimping adaptive adjustment component includes a second spring, a second spring sleeve, a second clamping shaft, and a second cylindrical pin. The second spring is installed inside the second spring sleeve from below. The second clamping shaft passes through the second spring sleeve and abuts against the second spring from below. The second cylindrical pin is coaxially arranged in the middle section of the second clamping shaft and has a diameter larger than that of the second clamping shaft. The inner wall of the second spring sleeve is provided with a second limiting channel that slides with the outer wall of the second cylindrical pin.

[0011] Furthermore, the shock absorber of the DC power terminal crimping adaptive adjustment component is located below the first pressing shaft and connected to the first pressing shaft;

[0012] The shock absorber of the AC power terminal crimping adaptive adjustment component is located below the second pressing shaft and connected to the second pressing shaft.

[0013] Furthermore, the DC conductive voltage connection component is fixed below the shock absorber of the DC power terminal crimping adaptive adjustment component via the first connector. The DC conductive voltage connection component includes a DC stacked busbar, a first crimped female terminal disposed above the DC stacked busbar, and a DC terminal pressure block disposed below the DC stacked busbar. The first connector passes through the DC terminal pressure block, the DC stacked busbar, and the first crimped female terminal sequentially from bottom to top and is then connected and fixed to the shock absorber of the DC power terminal crimping adaptive adjustment component.

[0014] The AC voltage conductive connection component is fixed below the shock absorber of the AC power terminal crimping adaptive adjustment component via a second connector. The AC voltage conductive connection component includes an AC stacked busbar, a second crimped female terminal disposed above the AC stacked busbar, and an AC terminal pressure block disposed below the AC stacked busbar. The second connector passes through the AC terminal pressure block, the AC stacked busbar, and the second crimped female terminal sequentially from bottom to top and is then connected and fixed to the shock absorber of the AC power terminal crimping adaptive adjustment component.

[0015] Furthermore, the maximum compression of the shock absorber is 2mm, and the shock absorber has a free deflection angle of no more than ±2° in the left and right directions.

[0016] Furthermore, the pressing mechanism is an actuator that performs linear motion up and down.

[0017] Furthermore, the installation position, quantity, and arrangement direction of the DC power terminal crimping adaptive adjustment component and the AC power terminal crimping adaptive adjustment component are adjustable.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The crimping device of this utility model can adapt to the crimping requirements of DC power terminals and AC power terminals respectively through the DC power terminal crimping adaptive adjustment component and the AC power terminal crimping adaptive adjustment component.

[0020] 2. This utility model provides floating buffer and angle compensation in the first stage of crimping through a shock absorber, compensating for height differences, parallel errors and angle deviations between crimping contact surfaces, and reducing local hard contact; in the second stage, the elastic clamping structure outputs a stable and recoverable crimping force, improving crimping consistency and reliability of power-on testing; during the pressing process, the crimping mechanism can automatically adapt to the height and contact surface deviation of the power terminals of the power module under test, realizing flat crimping of the power terminals, reliable conduction and rapid reset.

[0021] 3. This utility model reduces the reliance on shim adjustment by combining shock absorbers and elastic clamping structures, thereby reducing equipment maintenance and debugging time, lowering the risk of indentations on the power terminal surface, and improving the acceptance rate of the appearance quality of the tested power module. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the power end adaptive crimping device for power module testing equipment according to this utility model.

[0023] Figure 2 This is a schematic diagram of the crimping mechanism in this utility model.

[0024] Figure 3 This is a schematic diagram of the DC power terminal crimping adaptive adjustment component in this utility model.

[0025] Figure 4 This is a schematic diagram of the AC power terminal crimping adaptive adjustment component in this utility model.

[0026] In the picture:

[0027] 1. Pressing mechanism; 2. Crimping mechanism; 3. Power module under test;

[0028] 21. Adaptive adjustment component for DC power terminal crimping; 22. Adaptive adjustment component for AC power terminal crimping;

[0029] 211. First spring; 212. First clamping shaft; 213. First cylindrical pin; 214. First spring sleeve; 215. Shock absorber for DC power terminal crimping adaptive adjustment component; 216. First crimped female terminal; 217. DC terminal clamping block; 218. First internal hexagonal head screw; 219. DC stacked busbar;

[0030] 221. Second spring; 222. Second clamping shaft; 223. Second cylindrical pin; 224. Second spring sleeve; 225. Shock absorber for AC power terminal crimping adaptive adjustment component; 226. Second crimped female terminal; 227. AC terminal pressure block; 228. Second internal hexagonal head screw; 229. AC stacked busbar. Detailed Implementation

[0031] The technical solution of this utility model will be further described below with reference to specific embodiments:

[0032] An adaptive power end crimping device for power module testing equipment, such as Figure 1 and Figure 2As shown, the device includes a pressing mechanism 1 and a crimping mechanism 2. The crimping mechanism 2 includes a DC power terminal crimping adaptive adjustment component 21 and an AC power terminal crimping adaptive adjustment component 22. The DC power terminal crimping adaptive adjustment component 21 corresponds to the DC power terminals of the power module under test 3, and the AC power terminal crimping adaptive adjustment component 22 corresponds to the AC power terminals of the power module under test 3. The DC power terminal crimping adaptive adjustment component 21 and the AC power terminal crimping adaptive adjustment component 22 are detachably installed, and their installation position, quantity, and arrangement direction can be adjusted according to the number and layout of the terminals of the power module under test 3.

[0033] Specifically, the pressing mechanism 1 is an actuator that performs linear motion up and down, such as a cylinder, a servo motor with a lead screw, a hydraulic cylinder, or other actuators that achieve linear drive. The pressing mechanism 1 drives the pressing mechanism 2 to move up and down through its linear motion.

[0034] The DC power terminal crimping adaptive adjustment component 21 and the AC power terminal crimping adaptive adjustment component 22 are respectively provided with a shock absorber located below the pressing stroke of the crimping mechanism 2 and an elastic clamping structure located above the shock absorber. The crimping mechanism 2 has two pressing stages under the drive of the pressing mechanism 1. In the first pressing stage, the shock absorber provides buffering and angle compensation. In the second pressing stage, the elastic clamping structure is compressed so that the voltage-conducting connection component of the crimping mechanism 2 is in close contact with the power terminal of the device under test to form a conductive connection. The voltage-conducting connection component includes a DC voltage-conducting connection component and an AC voltage-conducting connection component.

[0035] More specifically, the DC power terminal crimping adaptive adjustment component 21, as shown in... Figure 3 As shown, the DC conductive voltage connection component includes a DC stacked busbar 219, a first crimped female terminal 216 disposed above the DC stacked busbar 219, and a DC terminal clamping block 217 disposed below the DC stacked busbar 219. A first connector passes sequentially from bottom to top through the DC terminal clamping block 217, the DC stacked busbar 219, and the first crimped female terminal 216, and is then connected and fixed to the shock absorber 215 of the DC power terminal crimping adaptive adjustment component. Exemplarily, the first connector is a first internal hexagonal head screw 218.

[0036] The elastic clamping structure of the DC power terminal crimping adaptive adjustment component 21 includes a first spring 211, a first spring sleeve 214, a first clamping shaft 212, and a first cylindrical pin 213. The first spring sleeve 214 is a hollow tube sleeve structure. The first spring 211 is inserted into the first spring sleeve 214 from below. The first clamping shaft 212 passes through the first spring sleeve 214 and abuts against the first spring 211 from below. The first cylindrical pin 213 is coaxially arranged in the middle section of the first clamping shaft 212 and has a diameter larger than that of the first clamping shaft 212. The inner wall of the first spring sleeve 214 is provided with a first limiting channel corresponding to the first cylindrical pin 213 and slidingly engaging with the outer wall of the first cylindrical pin 213. The first cylindrical pin 213 can... Within the range of the first limiting channel, the first cylindrical pin 213 prevents the first pressing shaft 212 from getting stuck when moving within the first spring sleeve 214. Simultaneously, the first cylindrical pin 213, in conjunction with the first limiting channel, also serves as a limiting mechanism, preventing the first cylindrical pin 213 and the first pressing shaft 212 from disengaging from the first spring sleeve 214. The first spring sleeve 214 of the elastic pressing structure is fixedly connected to the DC power terminal pressing adaptive adjustment component 21. During the pressing process of the pressing mechanism 2, the first pressing shaft 212 and the first cylindrical pin 213 move upwards to compress the first spring 211. As the first spring 211 is compressed, the DC terminal pressing block 217 contacts and gradually tightens with the DC power terminal of the device under test until a conductive connection is formed after tight contact. The shock absorber 215 of the DC power terminal pressing adaptive adjustment component is located below the first pressing shaft 212 and connected to it.

[0037] More specifically, the AC power terminal crimp adaptive adjustment component 22, such as Figure 4 As shown, the AC voltage connection component includes an AC stacked busbar 229, a second crimped female terminal 226 disposed above the AC stacked busbar 229, and an AC terminal clamping block 227 disposed below the AC stacked busbar 229. A second connector passes sequentially from bottom to top through the AC terminal clamping block 227, the AC stacked busbar 229, and the second crimped female terminal 226, and is then connected and fixed to the damper 225 of the AC power terminal crimping adaptive adjustment component. Exemplarily, the second connector is a second hexagon socket head cap screw 228.

[0038] The elastic clamping structure of the AC power terminal crimping adaptive adjustment component 22 includes a second spring 221, a second spring sleeve 224, a second clamping shaft 222, and a second cylindrical pin 223. The second spring sleeve 224 is a hollow tube sleeve structure. The second spring 221 is inserted into the second spring sleeve 224 from below. The second clamping shaft 222 passes through the second spring sleeve 224 and abuts against the second spring 221 from below. The second cylindrical pin 223 is coaxially arranged in the middle section of the second clamping shaft 222 and has a diameter larger than that of the second clamping shaft 222. The inner wall of the second spring sleeve 224 is provided with a second limiting channel corresponding to the second cylindrical pin 223, which slides with the outer wall of the second cylindrical pin 223. The second cylindrical pin 223 can... Within the range of the second limiting channel, the second cylindrical pin 223 prevents the second pressing shaft 222 from getting stuck when moving within the second spring sleeve 224. Simultaneously, the second cylindrical pin 223, in conjunction with the second limiting channel, also serves as a limiting mechanism, preventing the second cylindrical pin 223 and the second pressing shaft 222 from disengaging from the second spring sleeve 224. During the downward pressing process of the pressing mechanism 2, the second spring sleeve 224 of the elastic pressing structure is fixedly connected to the AC power terminal pressing adaptive adjustment component 22. The second pressing shaft 222 and the second cylindrical pin 223 move upward to compress the second spring 221. During the compression of the second spring 221, the AC terminal pressing block 227 contacts and gradually tightens with the AC power terminal of the device under test until a conductive connection is formed after tight contact is achieved. The shock absorber 225 of the AC power terminal pressing adaptive adjustment component is located below the second pressing shaft and connected to the second pressing shaft 222.

[0039] Preferably, the maximum compression of the shock absorber 215 of the DC power terminal crimping adaptive adjustment component and the shock absorber 225 of the AC power terminal crimping adaptive adjustment component is 2mm, and they have a free deflection angle of no more than ±2° in the left and right directions. Exemplarily, the shock absorber 215 of the DC power terminal crimping adaptive adjustment component and the shock absorber 225 of the AC power terminal crimping adaptive adjustment component are elastic supports, rubber buffers, spherical floating joints, universal floating mechanisms, or flexible connectors with buffering and angle compensation.

[0040] More specifically, the first spring 211 and the second spring 221 can be elastic clamping elements such as cylindrical helical springs, disc springs, wave springs, and gas springs.

[0041] The DC multilayer busbar 219 and AC multilayer busbar 229 can be replaced with other conductive terminals, flexible conductive fingers or multi-point contact conductive parts according to the test current, terminal shape and contact requirements.

[0042] To better understand the working principle of the power-end adaptive crimping device for power module testing equipment in this application, its working process is described as follows:

[0043] Before testing, place and fix the power module 3 under test on a tray or positioning fixture, so that the DC power terminal of the power module 3 under test is located below the DC power terminal crimping adaptive adjustment component 21, and the AC power terminal of the power module 3 under test is located below the AC power terminal crimping adaptive adjustment component 22.

[0044] At the start of the test, the pressing mechanism 1 moves downward, causing the pressing mechanism 2 to move downward as a whole. When the DC terminal pressing block 217 and the AC terminal pressing block 227 respectively contact the corresponding power terminals of the power module 3 under test, the pressing enters the first stage: the pressing mechanism 1 drives the pressing mechanism 2 to continue pressing down. The dampers 215 and 225 of the DC power terminal pressing adaptive adjustment component and the AC power terminal pressing adaptive adjustment component are compressed first and generate floating compensation, thereby compensating for the height difference, parallelism error and angle deviation between the power terminal contact surface and the pressing mechanism 2, so that the conductive contact component can adaptively fit the power terminal surface; then the pressing mechanism 1 drives the pressing mechanism 2 to press down further, entering the second stage of pressing: the first spring 211 and the second spring 221 are compressed and output a stable pressing force, so that the DC power terminal and the AC power terminal are reliably pressed and form an electrical connection, completing the pressing.

[0045] The testing equipment then enters the power-on testing phase. After the test is completed, the pressing mechanism 1 drives the pressing mechanism 2 to move upward. The first spring 211, the second spring 221, the shock absorber 215 of the DC power terminal pressing adaptive adjustment component, and the shock absorber 225 of the AC power terminal pressing adaptive adjustment component are reset. The DC terminal pressing block 217 and the AC terminal pressing block 227 are disengaged from the power terminals of the power module 3 under test. After the power module 3 under test is removed, the next test cycle begins.

[0046] It should be noted that the terms "first" and "second" in this application are merely for structural distinction and have no special meaning.

[0047] This embodiment is merely a further explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art can make non-inventive modifications to this embodiment as needed, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

Claims

1. A power-end adaptive crimping device for a power module testing equipment, comprising a pressing mechanism and a crimping mechanism, characterized in that, The crimping mechanism includes a DC power terminal crimping adaptive adjustment component corresponding to the DC power terminal of the power module under test and an AC power terminal crimping adaptive adjustment component corresponding to the AC power terminal of the power module under test. The DC power terminal crimping adaptive adjustment component and the AC power terminal crimping adaptive adjustment component are respectively provided with a shock absorber located below the crimping mechanism's pressing stroke and an elastic clamping structure located above the shock absorber; the crimping mechanism has two pressing stages under the driving of the pressing mechanism. In the first pressing stage, the shock absorber provides buffering and angle compensation, and in the second pressing stage, the elastic clamping structure is compressed so that the conductive connection component of the crimping mechanism is in close contact with the power terminal of the device under test to form a conductive connection.

2. The power end adaptive crimping device for a power module testing equipment according to claim 1, characterized in that, The voltage-conducting connection component includes a DC voltage-conducting connection component installed below the shock absorber of the DC power terminal press-fit adaptive adjustment component and an AC voltage-conducting connection component installed below the shock absorber of the AC power terminal press-fit adaptive adjustment component.

3. The power end adaptive crimping device for a power module testing equipment according to claim 2, characterized in that, The elastic clamping structure of the DC power terminal crimping adaptive adjustment component includes a first spring, a first spring sleeve, a first clamping shaft, and a first cylindrical pin. The first spring is inserted into the first spring sleeve from below. The first clamping shaft passes through the first spring sleeve and abuts against the first spring from below. The first cylindrical pin is coaxially arranged in the middle section of the first clamping shaft and has a diameter larger than that of the first clamping shaft. The inner wall of the first spring sleeve is provided with a first limiting channel that slides with the outer wall of the first cylindrical pin. The elastic clamping structure of the AC power terminal crimping adaptive adjustment component includes a second spring, a second spring sleeve, a second clamping shaft, and a second cylindrical pin. The second spring is installed inside the second spring sleeve from below. The second clamping shaft passes through the second spring sleeve and abuts against the second spring from below. The second cylindrical pin is coaxially arranged in the middle section of the second clamping shaft and has a diameter larger than that of the second clamping shaft. The inner wall of the second spring sleeve is provided with a second limiting channel that slides with the outer wall of the second cylindrical pin.

4. The power end adaptive crimping device for a power module testing equipment according to claim 3, characterized in that, The shock absorber of the DC power terminal crimping adaptive adjustment component is located below the first pressing shaft and connected to the first pressing shaft; The shock absorber of the AC power terminal crimping adaptive adjustment component is located below the second pressing shaft and connected to the second pressing shaft.

5. The power end adaptive crimping device for a power module testing equipment according to claim 4, characterized in that, The DC conductive voltage connection component is fixed below the shock absorber of the DC power terminal crimping adaptive adjustment component via a first connector. The DC conductive voltage connection component includes a DC stacked busbar, a first crimped female terminal disposed above the DC stacked busbar, and a DC terminal pressure block disposed below the DC stacked busbar. The first connector passes through the DC terminal pressure block, the DC stacked busbar, and the first crimped female terminal sequentially from bottom to top and is then connected and fixed to the shock absorber of the DC power terminal crimping adaptive adjustment component. The AC conductive voltage connection component is fixed below the shock absorber of the AC power terminal crimping adaptive adjustment component by a second connector. The AC conductive voltage connection component includes an AC stacked busbar, a second crimped female terminal disposed above the AC stacked busbar, and an AC terminal pressure block disposed below the AC stacked busbar. The second connector passes through the AC terminal pressure block, the AC stacked busbar, and the second crimped female terminal sequentially from bottom to top and is then connected and fixed to the shock absorber of the AC power terminal crimping adaptive adjustment component.

6. The power end adaptive crimping device for a power module testing equipment according to claim 1, characterized in that, The maximum compression of the shock absorber is 2mm, and the shock absorber has a free deflection angle of no more than ±2° in the left and right directions.

7. The power end adaptive crimping device for a power module testing equipment according to claim 1, characterized in that, The pressing mechanism is an actuator that moves linearly up and down.

8. The power end adaptive crimping device for a power module testing equipment according to claim 1, characterized in that, The installation position, quantity, and arrangement direction of the DC power terminal crimping adaptive adjustment component and the AC power terminal crimping adaptive adjustment component are adjustable.

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