A terminal for an IGBT power module resistant to bending and deformation
By incorporating external and internal protective sleeves and bent wire tabs on the IGBT power module terminals, the problem of terminals being prone to deformation or breakage under pressure is solved, thereby improving the mechanical stability and vibration resistance of the terminals.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI PROVINCE NINGGUO CITY WANLIAN ELECTRONICS
- Filing Date
- 2025-09-11
- Publication Date
- 2026-07-31
AI Technical Summary
The terminals of IGBT power modules are prone to S-shaped bending or breakage due to compression during use, and lack an effective positioning structure.
The protective sleeve is divided into external and internal protective sleeves. The internal protective sleeve covers the outside of the pin, while the external protective sleeve covers the internal protective sleeve and positions and fixes the contact end part. Combined with the design of the bent wire piece, it can alleviate thermal stress and mechanical stress.
It effectively prevents the terminals from bending into an S-shape due to compression when the signal is connected by contact, improves mechanical stability and vibration resistance, and avoids solder joint fatigue or internal bond wire breakage.
Smart Images
Figure CN224583747U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a terminal for an IGBT power module that is resistant to bending and deformation, and belongs to the technical field of IGBT power modules. Background Technology
[0002] IGBT power modules are core components in the field of modern power electronics, and can be described as the "CPU of power conversion". They integrate multiple IGBT chips and diode chips through advanced packaging technology to form a high-performance and high-reliability power switching unit. IGBT power modules include a DBC substrate and terminals. The DBC substrate is a direct-bonded copper-ceramic substrate, which is usually formed by sintering ceramic (commonly Al2O3 or AlN) and copper layers on both sides. It serves as a bridge for electrical insulation and excellent thermal conductivity. The terminals usually include main circuit terminals (high current P, N, U, V, W) and gate drive terminals (G, E), which are usually conductive pins for signal transmission. In related technologies, when IGBT power modules are in use, because there are no positioning modules at the terminal positions, when the terminal contacts are connected to activate the signal, the terminals are subjected to pressure and stress, which can easily cause S-shaped bending deformation or even breakage. Summary of the Invention To solve the above-mentioned technical problems, this utility model provides a terminal for an IGBT power module that is resistant to bending deformation, thereby solving the problem that the terminals of the IGBT power module in the background art are prone to S-shaped bending deformation due to extrusion stress, or even breakage. The technical solution adopted by this utility model to solve its technical problem is: A terminal for an IGBT power module designed to prevent bending deformation, the terminal of the IGBT power module comprising: The protective sleeve and lead assembly are provided. The protective sleeve is divided into an external protective sleeve and an internal protective sleeve. The lead assembly includes a pin and a contact end. The contact end is connected to one end of the pin. The internal protective sleeve covers the outside of the pin. The external protective sleeve covers the internal protective sleeve and positions the contact end.
[0003] Preferably, the pin includes a bent wire piece and a power contact terminal, one end of which is connected to one end of the bent wire piece, and the other end of the bent wire piece is equipped with a power contact terminal.
[0004] Preferably, the bent conductor piece located between the contact end and the power connection end is bent.
[0005] Preferably, the built-in protective sleeve forms a built-in protective cavity, and the power connection terminal is sealed and fixed at the notch position of the built-in protective cavity. One end of the bent wire is connected to the power connection terminal, and the bent wire is filled and installed inside the built-in protective cavity. At the same time, one end of the contact terminal located at one end of the bent wire passes through the opening of the built-in protective cavity.
[0006] Preferably, the outer protective sleeve forms an outer protective cavity, and a cover is installed at the opening of the outer protective cavity, with a through hole formed at the center of the cover; the inner protective sleeve, which wraps the bent wire piece, fills the outer protective cavity, and one end of the contact end passes through the through hole formed at the center of the cover.
[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: The terminals of the aforementioned bend-resistant IGBT power module have the following advantages compared to the terminals of current IGBT power modules: It uses a protective sleeve, which is divided into an external protective sleeve and an internal protective sleeve. The internal protective sleeve covers the outside of the pin, while the external protective sleeve covers the internal protective sleeve and also positions and fixes the contact end part. Therefore, by fixing the contact tip in a specific location, it can be ensured that the contact tip will not be squeezed and deformed into an S-shape when it is used to connect the electrical signal. Attached Figure Description
[0008] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0009] Figure 1 This is a schematic diagram of the terminal structure of an IGBT power module designed to prevent bending and deformation according to this utility model.
[0010] Figure 2 This is a schematic diagram of the internal structure of the terminals of an IGBT power module designed to prevent bending and deformation according to this utility model.
[0011] Figure 3 This is an exploded view of the terminals of an IGBT power module designed to prevent bending and deformation according to this utility model.
[0012] In the diagram: 1-Contact terminal, 2-Cap, 3-External protective sleeve, 4-External protective cavity, 5-Bent wire piece, 6-Internal protective cavity, 7-Internal protective sleeve, 8-Electrical terminal. Detailed Implementation
[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0014] Please see Figure 1-3 This utility model provides a technical solution: A terminal for an IGBT power module designed to prevent bending deformation, the terminal of the IGBT power module comprising: The protective sleeve and lead assembly are divided into an external protective sleeve 3 and an internal protective sleeve 7. Both the external protective sleeve 3 and the internal protective sleeve 7 are made of high-temperature vulcanized silicone rubber. The external protective sleeve 3 and the internal protective sleeve 7, made of high-temperature vulcanized silicone rubber, possess several excellent properties, such as excellent resistance to high and low temperatures, capable of fully withstanding the heat generated during IGBT module operation and the high temperatures generated during terminal soldering; they also have excellent electrical insulation, effectively preventing short circuits and arcing caused by accidental contact or contact between terminals due to their high dielectric strength; they also have high resistivity and stable insulation performance, maintaining good insulation even in high-temperature and high-humidity environments; furthermore, they possess good elasticity and excellent sealing properties, tightly wrapping around lead assemblies of different shapes and sizes, providing stable mechanical fixation and preventing detachment. The lead assembly includes pins and a contact end 1. The contact end 1 is connected to one end of the pin. An internal protective sleeve 7 covers the outside of the pin. An external protective sleeve 3 covers the internal protective sleeve 7 and also positions and fixes a portion of the contact end 1. By positioning and fixing a portion of the contact end 1, it can be ensured that the contact end 1 is not squeezed and deformed into an S-shape when it is used to connect the signal. Please see Figure 2 and Figure 3 In one embodiment of the present invention, the pin includes a bent wire piece 5 and a power receiving terminal 8. One end of the contact terminal 1 is connected to one end of the bent wire piece 5, and the other end of the bent wire piece 5 is equipped with the power receiving terminal 8. The bent wire piece 5 located between the contact terminal 1 and the power receiving terminal 8 is bent. The designed power terminal 8 is used to contact other signal contacts, while the bent lead wire 5 has several advantages, such as: 1. Relieving thermal stress; IGBTs generate a lot of heat during operation, causing the module body temperature to rise. The coefficients of thermal expansion (CTE) of the module substrate (usually copper or aluminum) and the PCB board (usually FR-4) are vastly different; when the temperature changes, the different amounts of expansion and contraction between the two will generate huge thermal stress on the pins directly connected to them; the bent lead wire 5 forms a mechanical buffer area, and the small elastic deformation of the bent lead wire 5 itself can alleviate this stress. It absorbs and releases this stress; if the bent lead wire 5 is designed as a straight line, without this bend, the stress will be directly applied to the bonding or soldering points between the pin and the chip inside the module, as well as the soldering points between the pin and the PCB. Under long-term cycling, this can easily lead to fatigue cracking of the soldering points or breakage of the internal bonding wires, causing the entire module to fail; secondly, it can also improve mechanical stability and vibration resistance. When the PCB is bent or deformed (e.g., in large boards), the elasticity of the bent lead wire 5 can better adapt to this deformation, avoiding direct transmission of stress to the IGBT module body and protecting the fragile internal connection structure; Please see Figure 2 and Figure 3 In one embodiment of this utility model, the built-in protective sleeve 7 forms a built-in protective cavity 6, the power receiving end 8 is sealed and fixed at the notch position of the built-in protective cavity 6, one end of the bent wire piece 5 is connected to the power receiving end 8, and the bent wire piece 5 is filled and installed inside the built-in protective cavity 6; at the same time, one end of the contact end 1 located at one end of the bent wire piece 5 passes through the opening position of the built-in protective cavity 6. By using the built-in protective sleeve 7 to isolate and protect the outside of the bent wire piece 5, the degree of bending of the bent wire piece 5 can be limited, thus preventing the bent wire piece 5 from being broken due to excessive pressure bending. Please refer to Figure 13 for contact end. In one embodiment of this utility model, an external protective cavity 4 is formed inside the external protective sleeve 3. A cover 2 is installed at the opening of the external protective cavity 4, and a through hole is formed at the axial position of the cover 2. At the same time, the inner protective sleeve 7, which wraps the bent wire piece 5, is filled inside the external protective cavity 4, and one end of the contact end 1 passes through the through hole formed at the axial position of the cover 2. The cover 2 installed at the opening of the external protective cavity 4 can position and fix the contact end 1 at the through hole of the cover 2, which can ensure that when the contact end 1 is used to connect the electric contact signal, it will not be squeezed and deformed into an S-shaped bend. The workflow of this embodiment is as follows: The terminals of the aforementioned anti-bending and deformation IGBT power module can be wrapped and covered by the inner protective sleeve 7 through the set external protective sleeve 3, while also positioning and fixing a portion of the contact end 1. By positioning and fixing a portion of the contact end 1, it can be ensured that the contact end 1 will not be squeezed and deformed into an S-shape when it is used to connect the electric contact signal. Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A terminal for an IGBT power module resistant to bending deformation, characterized in that... include: The protective sleeve and lead assembly are divided into an external protective sleeve (3) and an internal protective sleeve (7). The lead assembly includes a pin and a contact end (1). The contact end (1) is connected to one end of the pin. The internal protective sleeve (7) covers the outside of the pin. The external protective sleeve (3) covers the internal protective sleeve (7) and positions part of the contact end (1).
2. The terminal of the anti-bending-deformation IGBT power module according to claim 1, characterized in that: The pin includes a bent wire piece (5) and a power terminal (8). One end of the contact terminal (1) is connected to one end of the bent wire piece (5), and the other end of the bent wire piece (5) is equipped with the power terminal (8).
3. The terminal of the anti-bending-deformation IGBT power module according to claim 2, characterized in that: The bent conductor piece (5) located between the contact end (1) and the power connection end (8) is bent.
4. The terminal of the anti-bending-deformation IGBT power module according to claim 3, characterized in that: The built-in protective sleeve (7) forms a built-in protective cavity (6). The power connection end (8) is sealed and fixed at the notch of the built-in protective cavity (6). One end of the bent wire piece (5) is connected to the power connection end (8). The bent wire piece (5) is filled and installed inside the built-in protective cavity (6). At the same time, one end of the contact end (1) located at one end of the bent wire piece (5) passes through the opening of the built-in protective cavity (6).
5. The terminal of the anti-bending-deformation IGBT power module according to claim 4, characterized in that: The outer protective sleeve (3) forms an outer protective cavity (4) inside. A cover (2) is installed at the opening of the outer protective cavity (4), and a through hole is formed at the axial position of the cover (2). The inner protective sleeve (7) containing the bent wire piece (5) is filled inside the outer protective cavity (4), and one end of the contact end (1) passes through the through hole formed at the axial position of the cover (2).