Integrally-formed wiring terminal for ultrasonic welding
By designing terminals for bare copper base and gold-plated heads, the problem of unstable connection of terminals in the prior art is solved, and high-reliability connection between ultrasonic welding and soldering interfaces is achieved, and the risk of tin whiskers is avoided.
Patent Information
- Application Number
- CN202421679082.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-16
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-07-16
AI Technical Summary
The connection process of existing terminals is insufficient in the fields of IGBT power modules, especially in the ultrasonic welding and soldering interfaces, where there is instability and tin whisker risk.
Design an integrated molded terminal block including a bare copper base and a gold-plated head structure, which is used for ultrasonic welding and a gold-plated head for soldering to ensure connection reliability and avoid tin whisker risks.
It improves the connection reliability of the terminals, especially the stability at ultrasonic welding and soldering interfaces, avoids the generation of tin whiskers, and meets the needs of high-reliability connections.
Smart Images
Figure CN223079401U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power electronics and relates to an integrally formed terminal for ultrasonic welding. Background Art
[0002] At present, insulated gate bipolar transistor (IGBT) power modules are increasingly widely used in fields such as vehicle use, frequency converters, inverter welders, induction heating, rail transit, and wind and solar power generation. Especially for power modules, high requirements are imposed on the reliability of the structure and circuit connection. Therefore, the reliability of the connection process of the terminal is becoming increasingly important.
[0003] For this reason, an integrally formed terminal for ultrasonic welding is designed to overcome the above problems. Summary of the Utility Model
[0004] The purpose of the utility model is to overcome the deficiencies existing in the prior art and provide an integrally formed terminal for ultrasonic welding with a simple and reasonable structure, practical convenience, and high reliability. One end of the utility model, the base, can be used for a highly reliable connection process of ultrasonic welding, and the gold-plated head structure at the other end can be used for a stable and reliable connection process of soft soldering.
[0005] The utility model is realized by the following technical solutions: An integrally formed terminal for ultrasonic welding includes a terminal body. The terminal body is composed of a base for ultrasonic welding, a connecting rod, and a head structure for soft soldering. The middle position of the top surface of the base is connected to one side surface of the connecting rod, and the other side surface of the connecting rod is connected to the head structure for soft soldering. A chamfer or fillet structure for conveniently introducing a mating part hole is provided at the end of the head structure for soft soldering away from the base.
[0006] Preferably: The base, the connecting rod, and the head structure for soft soldering are all cylindrical structures, and the diameter of the connecting rod is smaller than the diameter of the base. The connecting rod and the base are transitionally connected through an arc-shaped connecting edge.
[0007] Preferably: The base, the connecting rod, and the head structure for soft soldering are fixedly connected by welding to ensure the integral formation of the three without a fixing structure for assembly.
[0008] Preferably: The cross-sectional diameter of the base is 1.5 - 3 mm, preferably 2 mm; the height of the base is 0.3 - 0.6 mm, preferably 0.4 mm. The cross-sectional diameters of the connecting rod and the head structure for soft soldering are both 0.8 - 1.5 mm, preferably 1.2 mm.
[0009] Preferably, the base, the connecting rod, and the head structure for soldering are all made of pure copper or copper alloy materials.
[0010] Preferably, the surface of the base is bare copper, and the surface of the head structure for soldering is gold-plated. This gold-plated surface is for convenient storage, ensuring a stable surface state, and avoiding the risk of tin whiskers that are likely to occur in tin-plated terminals.
[0011] The beneficial effects of the present utility model compared with the prior art are as follows:
[0012] The integrally formed terminal for ultrasonic welding designed by the present utility model has a base with a bare copper surface that can be connected to a mating copper part through an ultrasonic welding process. The connection of the same material greatly increases the connection reliability. The gold-plated head of this terminal can be connected to the hole of the mating part through a soldering connection, which is easy to store, has a stable surface state, and can avoid the risk of tin whiskers that are likely to occur in tin-plated terminals. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 is a schematic plan view of the present utility model;
[0014] Figure 2 is a perspective view of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0015] To make the purpose, technical solutions, and advantages of the present utility model clearer to those of ordinary skill in the art, the following further elaborates the present utility model with reference to the drawings and embodiments.
[0016] In the description of the present utility model, it should be understood that the terms such as "upper", "lower", "left", "right", "inner", "outer", "horizontal", "vertical", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These are only for the convenience of describing the present utility model and do not indicate or imply that the device or component referred to must have a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.
[0017] The following will introduce the present utility model in detail with reference to the drawings: As Figure 1-2 shown, an integrally formed terminal for ultrasonic welding includes a terminal body. The terminal body is composed of a base 1 for ultrasonic welding, a connecting rod 2, and a head structure 3 for soldering. The middle position of the top surface of the base 1 is connected to one side surface of the connecting rod 2, and the other side surface of the connecting rod 2 is connected to the head structure 3 for soldering. A chamfer or fillet structure 4 for conveniently guiding the mating part hole is provided at the end of the head structure 3 for soldering away from the base 1.
[0018] The base 1, the connecting rod 2, and the head structure 3 for soldering are all cylindrical structures. The diameter of the connecting rod 2 is smaller than that of the base 1. The connecting rod 2 and the base 1 are transitionally connected through an arc-shaped connecting edge 5. The connecting rod 2 and the head structure 3 for soldering can also be smoothly connected.
[0019] The base 1, the connecting rod 2, and the head structure 3 for soldering are fixed by welding to ensure the integral molding of the three, without the need for an assembly structure for fixation.
[0020] The cross-sectional diameter CI of the base 1 is 1.5 - 3 mm, preferably 2 mm; the height D1 of the base 1 is 0.3 - 0.6 mm, preferably 0.4 mm. The cross-sectional diameters B1 of the connecting rod 2 and the head structure 3 for soldering are both 0.8 - 1.5 mm, preferably 1.2 mm. The base 1, the connecting rod 2, and the head structure 3 for soldering are all made of pure copper or copper alloy materials. The surface of the base 1 is bare copper without any coating; the surface of the head structure 3 for soldering is gold-plated, and this gold-plated surface is used for convenient storage and to ensure a stable surface state and avoid the risk of tin whiskers easily generated by tin-plated terminals.
[0021] The bare copper surface base on one side of the terminal of the present utility model can be connected to its mating copper part through an ultrasonic welding process. The connection of the same material greatly increases the connection reliability; the gold-plated head structure for soldering of this terminal can be connected to the hole of its mating part through a soft soldering process, which is easy to store, has a stable surface state, and can avoid the risk of tin whiskers easily generated by tin-plated terminals.
[0022] It should be noted that for the base 1 of the ultrasonic welding in the present utility model, the connection surface with other parts in the ultrasonic welding process is required not to have local protrusions or local depressions, and a high flatness requirement is needed; and the process connection surface should not have dirt or oxidation. Of course, the base in the present utility model can also be other geometric structures. The cylindrical shape is only for illustration and can be adjusted according to actual situations without any limitation.
[0023] The specific embodiments described herein are only illustrative of the principles and effects of the present utility model, and are not used to limit the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.
Claims
1. An integrally formed terminal for ultrasonic welding, comprising a terminal body, characterized in that: The terminal body is composed of a base (1) for ultrasonic welding, a connecting rod (2), and a head structure (3) for soldering. The base (1) is connected to one side of the connecting rod (2), and the other side of the connecting rod (2) is connected to the head structure (3) for soldering. A chamfer or rounded corner structure (4) for facilitating the introduction of mating part holes is provided at one end of the head structure (3) for soldering away from the base (1).
2. The formed terminal according to claim 1, wherein: The base (1), the connecting rod (2), and the head structure (3) for soldering are all cylindrical structures, and the diameter of the connecting rod (2) is smaller than that of the base (1). The connecting rod (2) and the base (1) are transitionally connected through an arc-shaped connecting edge (5).
3. The molded terminal according to claim 2, wherein: The base (1), the connecting rod (2), and the head structure (3) for soldering are fixedly connected by welding to ensure the integral molding of the three, without the need for an assembly structure for fixation.
4. The molded terminal according to claim 2 or 3, characterized in that: The cross-sectional diameter of the base (1) is 1.5 - 3 mm, the height of the base (1) is 0.3 - 0.6 mm, and the cross-sectional diameters of the connecting rod (2) and the head structure (3) for soldering are both 0.8 - 1.5 mm.
5. The molded terminal according to claim 4, wherein: The base (1), the connecting rod (2), and the head structure (3) for soldering are all made of pure copper or copper alloy materials.
6. The formed terminal according to claim 5, wherein: The surface of the base (1) is bare copper, and the surface of the head structure (3) for soldering is gold-plated. This gold-plated surface is used for convenient storage, ensuring a stable surface state, and avoiding the risk of tin whiskers easily generated by tin-plated terminals.