A power conversion module welding workbench and welding method

Abstract

The invention discloses a power conversion module welding workbench and a welding method. The workbench includes a base assembly for clamping PIN pins and a plastic body, and providing a welding head assembly I; a linear slide assembly for clamping a plastic package body, and providing a welding head assembly II; and left and right welding systems for laser welding PIN pins. During welding: the plastic package body is fixed in the vertical direction by a vertical clamping mechanism; the PIN pin is fixed to the plastic package body in the horizontal direction by a horizontal clamping mechanism; after the plastic package body is preheated as a whole, laser welding is used to weld the PIN pin in a Z-shaped manner, corresponding to the copper layer of the cut surface of the plastic package body one by one; the plastic body is wrapped with the plastic package body and the PIN pin as a whole by a thermal resistance welding method. The present invention adopts laser welding of PIN pins and adopts a Z-shaped welding trajectory to avoid the phenomenon of cold welding and ensure welding stability; thermal resistance welding of the plastic body is adopted to increase the welding reliability of the plastic body, reduce the time required for welding, and improve the welding efficiency of the workbench.

Description

Technical Field

[0001] The invention belongs to the technical field of laser welding and thermal resistance welding, and relates to a power conversion module welding workbench and a welding method, and is particularly suitable for PIN pin laser welding and plastic body thermal resistance welding in the mass production process of power conversion modules. Background Art

[0002] At present, power conversion modules mainly use module-level double-sided plastic packaging technology with complex PCBA structure. By using high thermal conductivity plastic packaging materials and high thermal conductivity PCB materials, effective heat dissipation function is achieved, and the copper layer inside the PCB is used as a connection point for assembly and welding with external pins. However, PCBA often produces a large temperature difference during the welding heating process. Once this temperature difference exceeds the standard, poor welding will occur.

[0003] At present, power conversion modules mainly use traditional soldering technology. On the one hand, the connection strength of the solder joints is low and the processing cost of the PIN needles is high. On the other hand, it requires the addition of metal blind holes on the side of the PCB board, and has high requirements for the plastic sealing process and material temperature resistance. Special processes are required to protect the metal blind holes during the plastic sealing process. Therefore, the welding efficiency and reliability are low. Summary of the invention

[0004] The purpose of the present invention is to provide a power conversion module welding workbench and a welding method to address the problems existing in the prior art, so as to realize the rapid welding of the PIN pins and the plastic body of the power conversion module, so as to reduce the difficulty of plastic packaging processing and production costs, reduce processing steps, increase welding reliability, and improve production efficiency.

[0005] The technical solution for achieving the purpose of the present invention is: a power conversion module welding workbench, characterized in that the workbench includes a base assembly, a linear slide group, and a left welding system and a right welding system located on both sides of the linear slide group;

[0006] The base assembly includes a base and a horizontal clamping mechanism; the linear slide group includes a linear guide rail and a vertical clamping mechanism; the left welding system includes a left linear slide rail and a left welding mechanism; the right welding system includes a right linear slide rail and a right welding mechanism;

[0007] The horizontal clamping mechanism is fixed on the base and is used to clamp the PIN pin and the plastic body; the horizontal clamping mechanism includes a slide rail, a slide group I, a clamping plate I, a clamping plate II and a welding head assembly I, the slide group I is located on the slide rail and can slide horizontally along the slide rail, the clamping plate I and the clamping plate II are located on the slide group I, and under the drive of the slide group I, the two clamping plates realize horizontal reverse clamping or loosening of the clamped part; the welding head assembly I includes a left welding head and a right welding head, which are respectively located on the left and right sides of the clamped part;

[0008] The linear guide is fixed on the base and is perpendicular to the surface of the base; the vertical clamping mechanism can slide up and down along the linear guide to clamp the plastic package; the water vertical clamping mechanism includes a sliding base, a sliding group II, a clamping plate III, a clamping plate IV and a welding head assembly II; the sliding base is located on the linear guide and can slide up and down along the linear guide, the clamping plate III and the clamping plate IV are located on the sliding group II, and under the drive of the sliding group II, the two clamping plates realize the fixing of the clamped part in the vertical direction; the welding head assembly II includes an upper welding head and a lower welding head, which are respectively located on the upper and lower sides of the clamped part;

[0009] The left linear slide is fixed on the base, and the left welding mechanism can slide along the left linear slide for laser welding the PIN pins on the left side of the plastic package; the right linear slide is fixed on the base, and the right welding mechanism can slide along the right linear slide for laser welding the PIN pins on the right side of the plastic package.

[0010] Furthermore, the upper welding head and the lower welding head are respectively located on the inner sides of the clamping plate III and the clamping plate IV.

[0011] Furthermore, when the left welding structure is in operation, it is locked on the left linear slide rail by the locking device I to perform local Z-shaped welding.

[0012] Furthermore, when the right welding structure is in operation, it is locked on the right linear slide rail by the locking device II to perform local Z-shaped welding.

[0013] Furthermore, the left welding mechanism and the right welding mechanism can perform different welding actions, and can also perform centrally symmetrical synchronous welding actions.

[0014] Furthermore, the left welding mechanism and the right welding mechanism are driven by hand wheels to slide along the left linear slide rail and the right linear slide rail respectively.

[0015] Based on the welding method of the welding workbench, during welding:

[0016] (1) The plastic package body is fixed in the vertical direction by a vertical clamping mechanism; the PIN pins are fixed to the plastic package body as a whole in the horizontal direction by clamping plates I and II of the horizontal clamping mechanism respectively;

[0017] (2) After the plastic package body is preheated as a whole by the upper welding head and the lower welding head, the PIN pins are welded by laser welding, and the welding track is Z-shaped and corresponds to the copper layer on the cut surface of the plastic package body one by one;

[0018] (3) After the PIN pin is laser welded, the left welding head and the right welding head heat the plastic body;

[0019] (4) The plastic body is fixed to the plastic package body after welding the PIN pins through a horizontal clamping mechanism, and is wrapped with the plastic package body and the PIN pins as a whole by a left welding head and a right welding head using a thermal resistance welding method.

[0020] Compared with the prior art, the present invention has the following significant advantages: it can realize rapid welding of power conversion modules, reduce the processing difficulty and production cost of plastic packaging parts, avoid high temperature differences during welding, improve production efficiency, and increase welding reliability.

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional diagram of the welding workbench of the power conversion module of the present invention.

[0023] Figure 2 This is a front view of a welding workbench for a power conversion module of the present invention.

[0024] Figure 3 This is a top view of the welding workbench of the power conversion module of the present invention.

[0025] Figure 4 It is a three-dimensional diagram of the plastic package, PIN pins and plastic body of the power conversion module of the present invention.

[0026] Figure 5 This is a welding track diagram of the PIN pins on the right side of the power conversion module of the present invention.

[0027] Figure 6 This is a welding effect diagram of the PIN pin on the right side of the power conversion module of the present invention.

[0028] Figure 7 This is a diagram of the thermal resistance welding operation of the plastic parts of the power conversion module of the present invention.

[0029] In the figure, 1 is a base, 2 is a slide rail, 3 is a slide group I, 4 is a clamp plate I, 5 is a clamp plate II, 6 is a left welding head, 7 is a right welding head, 8 is a linear guide rail, 9 is a locking device, 10 is a sliding base, 11 is a slide group II, 12 is a clamp plate III, 13 is a clamp plate IV, 14 is an upper welding head, 15 is a lower welding head, 16 is a left linear slide rail, 17 is a left welding mechanism, 18 is a locking device I, 19 is a right linear slide rail, 20 is a right welding mechanism, 21 is a locking device II, 22 is a plastic package body, 23 is a left PIN pin, 24 is a right PIN pin, 25 is a plastic body, and 26 is a welding seam. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0032] Combination Figure 1 to Figure 7 , provides a power conversion module welding workbench, including a base assembly, a linear slide group, a left welding system, and a right welding system; the base assembly includes a base 1 and a horizontal clamping mechanism; the linear slide group includes a linear guide rail 8 and a vertical clamping mechanism; the left welding system includes a left linear slide rail 16 and a left welding mechanism 17; the right welding system is similar to the left welding system in structure and function.

[0033] The horizontal clamping mechanism is fixed on the base 1 and is used to clamp PIN pins and thermal resistance welding plastic bodies; the horizontal clamping mechanism includes a slide rail 2, a slide group Ⅰ3, a clamp Ⅰ4, a clamp Ⅱ5, and a welding head assembly Ⅰ. The slide group Ⅰ is located on the slide rail 2 and can slide horizontally along the slide rail 2. The clamp Ⅰ4 and the clamp Ⅱ5 are located on the slide group Ⅰ3. Under the drive of the slide group Ⅰ3, the two clamps can realize horizontal reverse clamping or release of the PIN pins or thermal resistance welding plastic bodies; the welding head assembly Ⅰ includes a left welding head 6 and a right welding head 7.

[0034] The linear guide 8 is fixed to the base 1 by bolts; the vertical clamping mechanism can slide up and down along the linear guide 8 and is used to clamp the plastic package body 22; the vertical clamping mechanism includes a sliding base 10, a sliding group Ⅱ11, a clamping plate Ⅲ12, a clamping plate Ⅳ13, and a welding head assembly Ⅱ. The sliding base 10 is located on the linear guide 8 and can slide up and down along the linear guide 8. The clamping plate Ⅲ12 and the clamping plate Ⅳ13 are located on the sliding group Ⅱ11. Under the drive of the sliding group Ⅱ11, the two clamping plates realize the fixing of the plastic package body 22 in the vertical direction. When fixed, the sliding base 10 is locked to the linear guide 8 by a locking device 9; the welding head assembly Ⅱ includes an upper welding head 14 and a lower welding head 15.

[0035] The slide group I3 performs a synchronous reverse clamping action of the clamping plates I4 and II5.

[0036] The upper welding head 14 and the lower welding head 15 are fixed to the inner sides of the clamping plate III 12 and the clamping plate IV 13 respectively.

[0037] The left linear slide rail 16 is fixed to the base 1 by bolts; the left welding mechanism 17 can slide along the left linear slide rail 16 for laser welding the left PIN pin 23; the left welding structure 17 is locked on the slide rail by the locking device I18 during operation to perform local Z-shaped welding.

[0038] The right linear slide rail 19 is fixed to the base 1 by bolts; the right welding mechanism 20 can slide along the right linear slide rail 19 for laser welding the right PIN pin 24; the right welding mechanism 20 is locked on the slide rail by the locking device II 21 during operation to perform local Z-shaped welding.

[0039] The left welding mechanism 17 and the right welding mechanism 20 can perform different welding actions, and can also perform centrally symmetrical synchronous welding actions.

[0040] When welding:

[0041] (1) The plastic package body 22 is fixed in the vertical direction by a vertical clamping mechanism; the PIN pins are fixed to the plastic package body 22 in the horizontal direction by clamping plates Ⅰ4 and Ⅱ5 of the horizontal clamping mechanism respectively;

[0042] (2) After the plastic package body 22 is preheated as a whole by the upper welding head 14 and the lower welding head 15 (the purpose of preheating is mainly to achieve the laser welding which requires too much heat), the PIN pins are welded by laser welding, and the welding track adopts a Z-shape, which corresponds one by one to the copper layer of the cut surface of the plastic package body 22;

[0043] (3) After the PIN pin is laser welded, the left welding head 6 and the right welding head 7 heat the plastic body;

[0044] (4) The plastic body 25 is fixed to the plastic package body 22 after the PIN pins are welded by a horizontal clamping mechanism, and is wrapped with the plastic package body 22 and the PIN pins by the left welding head 6 and the right welding head 7 using thermal resistance welding.

[0045] The upper welding head 14 and the lower welding head 15 heat the plastic package body 22 as a whole, while the left welding head 6 and the right welding head 7 heat the plastic body 25 respectively, which can effectively avoid a large temperature difference during the thermal resistance welding process.

[0046] The following describes a one-time use process of the present invention in conjunction with the accompanying drawings:

[0047] When laser welding the PIN pins, first, the upper welding head 14 and the lower welding head 15 are fixed to the inner sides of the clamping plates III 12 and IV 13 respectively; the clamping plates III 12 and IV 13 of the vertical clamping mechanism are driven by the sliding group II 11 to fix the plastic package 22 in the vertical direction through the upper welding head 14 and the lower welding head 15; then, the clamping plates I 4 and II 5 of the horizontal clamping mechanism are driven by the sliding group I 3 to clamp the left PIN pin 23 and the right PIN pin 24 in the horizontal direction and fix them as a whole with the plastic package 22; secondly, the plastic package After the upper welding head 14 and the lower welding head 15 are preheated as a whole, the left welding mechanism 17 and the right welding mechanism 20 are driven by the hand wheel to slide along the left linear slide rail 16 and the right linear slide rail 19 to the welding position, and are locked on the slide rails by the locking device I 18 and the locking device II 21 respectively; then, the left welding mechanism 17 and the right welding mechanism 20 respectively weld the left PIN pin 23 and the right PIN pin 24 by laser welding, wherein the welding track adopts a Z shape, which corresponds to the copper layer of the cut surface of the plastic package body 22 one by one, and the weld 26 is as shown in FIG. Figure 6 As shown; if the power conversion module requires more welding points, multi-point welding can be achieved by moving the left welding mechanism 17 and the right welding mechanism 20; in addition, during the entire welding process, a high-precision sensor is used to achieve visual control of the preheating temperature.

[0048] When the plastic body 25 is welded by thermal resistance welding, first, the left welding mechanism 17 and the right welding mechanism 20 are driven by the hand wheel to slide along the left linear slide 16 and the right linear slide 19 to leave the welding area; then, the clamping plate Ⅰ4 and the clamping plate Ⅱ5 of the horizontal clamping mechanism are synchronously moved away in the opposite direction under the drive of the slide group Ⅰ3, and after the left welding head 6 and the right welding head 7 are respectively installed on the inner sides of the clamping plate Ⅰ4 and the clamping plate Ⅱ5, they are synchronously moved in the opposite direction under the drive of the slide group Ⅰ3 to fix the plastic body 25 and the plastic package body 22 after the PIN pin is welded; secondly, the upper welding head 14 and the lower welding head 15 heat the plastic package body 22, and at the same time, the left welding head 6 and the right welding head 7 heat the plastic body 25 respectively, and the heating is stopped after the thermal resistance welding is completed and the cooling and solidification are carried out; in addition, in the whole welding process, a high-precision sensor is used to realize the visual control of the thermal resistance welding temperature.

[0049] The present invention adopts laser welding PIN pins and a Z-shaped welding track to avoid cold welding and ensure welding stability; in addition, thermal resistance welding of the plastic body is adopted to increase the welding reliability of the plastic body and reduce the time required for welding; thus improving the welding efficiency of the workbench.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A power conversion module welding workbench, characterized in that: The workbench includes a base assembly, a linear slide assembly, and a left welding system and a right welding system located on both sides of the linear slide assembly; The base assembly includes a base and a horizontal clamping mechanism; the linear slide group includes a linear guide rail and a vertical clamping mechanism; the left welding system includes a left linear slide rail and a left welding mechanism; the right welding system includes a right linear slide rail and a right welding mechanism; The horizontal clamping mechanism is fixed on the base and is used to clamp the PIN pin and the plastic body; the horizontal clamping mechanism includes a slide rail, a slide group I, a clamping plate I, a clamping plate II and a welding head assembly I, the slide group I is located on the slide rail and can slide horizontally along the slide rail, the clamping plate I and the clamping plate II are located on the slide group I, and under the drive of the slide group I, the two clamping plates can clamp or release the clamped part in the horizontal direction; the welding head assembly I includes a left welding head and a right welding head, which are respectively located on the left and right sides of the clamped part; The linear guide is fixed on the base and is perpendicular to the surface of the base; the vertical clamping mechanism can slide up and down along the linear guide to clamp the plastic package; the vertical clamping mechanism includes a sliding base, a sliding group II, a clamping plate III, a clamping plate IV and a welding head assembly II; the sliding base is located on the linear guide and can slide up and down along the linear guide, the clamping plate III and the clamping plate IV are located on the sliding group II, and under the drive of the sliding group II, the two clamping plates realize the fixing of the clamped part in the vertical direction; the welding head assembly II includes an upper welding head and a lower welding head, which are respectively located on the upper and lower sides of the clamped part; The left linear slide is fixed on the base, and the left welding mechanism can slide along the left linear slide for laser welding the PIN pins on the left side of the plastic package, and the welding track adopts a Z-shape; the right linear slide is fixed on the base, and the right welding mechanism can slide along the right linear slide for laser welding the PIN pins on the right side of the plastic package; When the welding workbench is working, the upper welding head and the lower welding head preheat the plastic package body as a whole before laser welding, and during thermal resistance welding, the left welding head and the right welding head heat the plastic body at the same time.

2. The power conversion module welding workbench according to claim 1, characterized in that: The upper welding head and the lower welding head are respectively located on the inner sides of the clamping plate III and the clamping plate IV.

3. The power conversion module welding workbench according to claim 1, characterized in that: When the left welding mechanism is in operation, it is locked on the left linear slide rail through the locking device I to perform local Z-shaped welding.

4. The power conversion module welding workbench according to claim 1, characterized in that: When the right welding mechanism is in operation, it is locked on the right linear slide rail through the locking device II to perform local Z-shaped welding.

5. The power conversion module welding workbench according to claim 1, characterized in that: The left welding mechanism and the right welding mechanism can perform different welding actions, and can also perform centrally symmetrical synchronous welding actions.

6. The power conversion module welding workbench according to claim 1, characterized in that: The left welding mechanism and the right welding mechanism are driven by hand wheels to slide along the left linear slide rail and the right linear slide rail respectively.

7. The power conversion module welding workbench according to claim 1, characterized in that: The plastic body is welded with the plastic package body and the PIN pin by means of thermal resistance welding.

8. A welding method based on the welding workbench according to any one of claims 1 to 7, characterized in that: When welding: (1) The plastic package body is fixed in the vertical direction by a vertical clamping mechanism; the PIN pins are fixed to the plastic package body as a whole in the horizontal direction by clamping plates I and II of the horizontal clamping mechanism respectively; (2) After the plastic package body is preheated as a whole by the upper welding head and the lower welding head, the PIN pins are welded by laser welding, and the welding track adopts a Z-shape, which corresponds to the copper layer on the cut surface of the plastic package body one by one; (3) After the PIN pin is laser welded, the left welding head and the right welding head heat the plastic body; (4) The plastic body is fixed to the plastic package body after the PIN pin is welded through a horizontal clamping mechanism, and is wrapped with the plastic package body and the PIN pin as a whole by a left welding head and a right welding head using a thermal resistance welding method.

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