CN215342572U - IGBT welding module frame metal terminal - Google Patents
IGBT welding module frame metal terminal Download PDFInfo
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- CN215342572U CN215342572U CN202121649424.2U CN202121649424U CN215342572U CN 215342572 U CN215342572 U CN 215342572U CN 202121649424 U CN202121649424 U CN 202121649424U CN 215342572 U CN215342572 U CN 215342572U
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Abstract
The utility model discloses a metal terminal of an IGBT welding module frame, which comprises: the terminal body is punched and cut into a preset shape required by welding a module frame, and is made of a first type of ultrasonic weldable metal; a welding end portion formed on the terminal main body for welding with the IGBT substrate land; the first plating layer is formed on the outer surface of the welding end part after plasma cleaning, is made of second ultrasonic welding metal and is divided into a first contact surface and a second contact surface, the first contact surface is used for welding an IGBT welding area, and the second contact surface is used for contacting an ultrasonic welding head; the first contact surface has a rough surface formed by surface roughening treatment. The utility model can avoid welding failure caused by surface pollution of the welding leg and improve welding firmness.
Description
Technical Field
The utility model relates to the field of electronics, in particular to a metal terminal of an IGBT welding module frame.
Background
The power module is an advanced hybrid integrated power component with an IGBT (insulated gate bipolar transistor) as an inner core, and consists of a high-speed low-power-consumption tube core (IGBT), an optimized gate drive circuit and a quick protection circuit.
Ultrasonic welding is performed by transmitting a high-frequency vibration wave to the surfaces of two objects to be welded, and rubbing the surfaces of the two objects against each other under pressure to form a fusion between the molecular layers.
Most of the existing ultrasonic bonding of IGBTs is via bonding between copper pins on the frame and copper on the surface of the DCB. In actual production, the surfaces of metal terminals (copper welding feet) of the IGBT welding module frames on the frames can be polluted by stamping oil in the stamping manufacturing process, and if the pollution is not cleaned, the weldability of the surfaces of the welding feet is poor, and finally, ultrasonic welding failure is caused.
SUMMERY OF THE UTILITY MODEL
In the summary section, a series of simplified form concepts are introduced, which are simplifications of the prior art in this field, and which will be further detailed in the detailed description section. The inventive content of the present invention is not intended to define key features or essential features of the claimed solution, nor is it intended to be used to limit the scope of the claimed solution.
The utility model aims to solve the technical problem of providing a metal terminal of an IGBT welding module frame, which can avoid welding failure caused by surface pollution of a welding leg.
In order to solve the above technical problem, the present invention provides an IGBT welding module frame metal terminal, including:
a terminal body stamped and cut into a predetermined shape required for welding a module frame, the terminal body being made of a first ultrasonically weldable metal; the preset shape is a shape which is punched and cut according to different processes and is suitable for ultrasonic welding, the shape is not fixed, and the shape is selected according to different ultrasonic welding machine designs, such as rectangle, square and all existing designed shapes can be used as the preset shape.
A welding end portion formed on the terminal main body for welding with the IGBT substrate land;
the first plating layer is formed on the outer surface of the welding end part after plasma cleaning, is made of a second ultrasonic welding metal and is divided into a first contact surface and a second contact surface, the first contact surface is used for welding an IGBT welding area, and the second contact surface is used for contacting an ultrasonic welding head;
wherein, the first contact surface has a rough surface formed by surface roughening treatment.
Surface roughening treatment: the surface of the workpiece is treated (mechanically abraded or chemically corroded) mechanically or chemically, so that a micro-rough structure is obtained on the surface of the workpiece, the micro-rough structure is changed from hydrophobicity to hydrophilicity, and the bonding force between the top surface of the ultrasonic welding metal terminal and the metal terminal of the welding module frame is improved.
Optionally, the metal terminal of the IGBT welding module frame is further improved, and the welding end parts are arranged on the terminal main body in a group and in parallel.
Optionally, the metal terminal of the IGBT welded module frame is further improved, and an indentation is formed at the joint of the welding end and the terminal body. The indentation makes the welding tip easily buckle, avoids welding tip and terminal main part junction rupture when buckling.
Optionally, the metal terminal of the IGBT welded module frame is further improved, and the width of the joint of the welding end and the terminal body is smaller than the width of the welding end. The width of the joint of the welding end part and the terminal main body is smaller than that of the welding end part, so that the welding end part is easy to bend, and the joint of the welding end part and the terminal main body is prevented from being broken when the welding is bent.
Optionally, the metal terminal of the IGBT welding module frame is further improved, and the shape and the area of the welding end part are the same as those of the welding area of the IGBT substrate.
Optionally, the IGBT welded module frame metal terminal is further improved, further including:
and a second plating layer formed on the first plating layer and made of the same material as the welding end, wherein a third contact surface of the second plating layer is used for welding the IGBT welding area, and the third contact surface of the second plating layer has a rough surface formed by surface roughening treatment.
Optionally, the IGBT welded module frame metal terminal is further improved, further including:
and a second plating layer formed only on the first contact surface of the first plating layer and made of the same material as the welding end portion, wherein a third contact surface of the second plating layer is used for welding the IGBT welding area, and the third contact surface of the second plating layer has a rough surface formed by surface roughening treatment.
Optionally, the IGBT welded module frame metal terminal is further improved, further including:
and a plurality of metal protrusions which are uniformly distributed on the first plating layer and are made of the same material as the welding end parts.
Optionally, the IGBT welded module frame metal terminal is further improved, further including:
and a plurality of metal projections formed only on the first contact surface of the first plating layer, which are made of the same material as the welding end portion.
Alternatively, the metal terminal of the IGBT welding module frame, the terminal main body and the welding end part are made of copper, and the first plating layer is made of nickel.
The working principle of the utility model is as follows:
the first coating is formed on the outer surface of the welding end part after plasma cleaning, surface pollution in the stamping manufacturing process can be eliminated after the outer surface of the welding end part is subjected to plasma cleaning, and the first coating capable of being ultrasonically welded is formed on the outer surface of the welding end part, so that even if the surface pollution remains after the plasma cleaning, the first coating can be coated, the welding end part and the first coating are both made of materials capable of being ultrasonically welded during ultrasonic welding, the welding end part and the first coating are made of different materials capable of being ultrasonically welded, the melting points of the different materials during ultrasonic welding are different, the melting point difference is favorable for fusion of the two materials, the welding firmness of a metal terminal (copper welding leg) of an IGBT welding module frame and a welding zone of an IGBT substrate is greatly improved, and the welding failure condition is avoided.
In a further preferred embodiment of the present invention, a second plating layer (or a plurality of metal protrusions) made of the same material as the first plating layer is coated outside the first plating layer (or the first contact surface), and a sandwich structure composed of a welding end (e.g. copper), a first plating layer (e.g. nickel), and a second plating layer (e.g. copper)/a plurality of metal protrusions (e.g. copper) is formed at the welding end of the IGBT welding module frame metal terminal.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model, are incorporated in and constitute a part of this specification. The drawings are not necessarily to scale, however, and may not be intended to accurately reflect the precise structural or performance characteristics of any given embodiment, and should not be construed as limiting or restricting the scope of values or properties encompassed by exemplary embodiments in accordance with the utility model. The utility model will be described in further detail with reference to the following detailed description and accompanying drawings:
fig. 1 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 2 is a cross-sectional view of a welded end of a first embodiment of the present invention.
Fig. 3 is a cross-sectional view of a welded end of a third embodiment of the present invention.
Fig. 4 is a cross-sectional view of a welded end of a fourth embodiment of the present invention.
Description of the reference numerals
Welding end 2
First contact surface 3.1
Second contact surface 3.2
Second plating layer 4
Third contact surface 4.1
And a metal projection 5.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and technical effects of the present invention will be fully apparent to those skilled in the art from the disclosure in the specification. The utility model is capable of other embodiments and of being practiced or of being carried out in various details, and its several details are capable of modifications in various obvious respects, all without departing from the spirit and scope of the utility model. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. The following exemplary embodiments of the present invention may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solutions of these exemplary embodiments to those skilled in the art.
It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Like reference numerals refer to like elements throughout the drawings. Further, it will be understood that, although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of exemplary embodiments according to the present invention.
A first embodiment;
as shown in fig. 1 and 2, the present invention provides an IGBT welded module frame metal terminal, including:
the terminal body 1 is punched and cut into a preset shape required by welding a module frame, the rectangular shape is taken as an example in the embodiment, the terminal body is made of a first ultrasonic weldable metal, and the copper is adopted in the embodiment;
a welding end portion 2 formed on the terminal body 1 for welding with an IGBT substrate land;
a first plating layer 3 formed on the outer surface of the plasma-cleaned welding end portion 2 and made of a second ultrasonically-weldable metal, in this embodiment, nickel is used and divided into a first contact surface 3.1 and a second contact surface 3.2, the first contact surface 3.1 is used for welding an IGBT welding area, and the second contact surface 3.2 is used for contacting an ultrasonic welding head;
wherein the first contact surface 3.1 has a rough surface formed by surface roughening treatment.
Surface roughening treatment: the surface of the workpiece is treated (mechanically abraded or chemically corroded) mechanically or chemically, so that a micro-rough structure is obtained on the surface of the workpiece, the micro-rough structure is changed from hydrophobicity to hydrophilicity, and the bonding force between the top surface of the ultrasonic welding metal terminal and the metal terminal of the welding module frame is improved.
A second embodiment;
with continued reference to fig. 1 and 2, the present invention provides an IGBT welded module frame metal terminal, including:
the terminal body 1 is punched and cut into a preset shape required by welding a module frame, the rectangular shape is taken as an example in the embodiment, the terminal body is made of a first ultrasonic weldable metal, and the copper is adopted in the embodiment;
a welding end portion 2 formed on the terminal body 1 for welding with an IGBT substrate land;
a first plating layer 3 formed on the outer surface of the plasma-cleaned welding end portion 2 and made of a second ultrasonically-weldable metal, in this embodiment, nickel is used and divided into a first contact surface 3.1 and a second contact surface 3.2, the first contact surface 3.1 is used for welding an IGBT welding area, and the second contact surface 3.2 is used for contacting an ultrasonic welding head;
the first contact surface 3.1 has a rough surface formed by surface roughening treatment, the welding end parts 2 are arranged on the terminal main body 1 in parallel in groups, an indentation is formed at the joint of the welding end part 2 and the terminal main body 1, and the width of the joint of the welding end part 2 and the terminal main body 1 is smaller than that of the welding end part.
Alternatively, the second embodiment is further modified, and the shape and area of the soldering terminal portion are the same as those of the IGBT substrate land.
A third embodiment;
referring to fig. 3 in conjunction with fig. 1, the present invention provides an IGBT welded module frame metal terminal, including:
the terminal body 1 is punched and cut into a preset shape required by welding a module frame, the rectangular shape is taken as an example in the embodiment, the terminal body is made of a first ultrasonic weldable metal, and the copper is adopted in the embodiment;
a welding end portion 2 formed on the terminal body 1 for welding with an IGBT substrate land;
a first plating layer 3 formed on the outer surface of the plasma-cleaned welding end portion 2 and made of a second ultrasonically-weldable metal, in this embodiment, nickel is used and divided into a first contact surface 3.1 and a second contact surface 3.2, the first contact surface 3.1 is used for welding an IGBT welding area, and the second contact surface 3.2 is used for contacting an ultrasonic welding head;
and a second plating layer 4 formed on the first plating layer 3 and made of the same material as the welding end portion 2, wherein a third contact surface 4.1 of the second plating layer 4 is used for welding the IGBT welding area, and the third contact surface 4.1 of the second plating layer 4 has a rough surface formed by surface roughening treatment.
The first contact surface 3.1 has a rough surface formed by surface roughening treatment, the welding end parts 2 are arranged on the terminal main body 1 in parallel in groups, at least one indentation is formed at the joint of the welding end part 2 and the terminal main body 1, and the width of the joint of the welding end part 2 and the terminal main body 1 is smaller than that of the welding end part.
Alternatively, the above third embodiment is further modified; the second plating layer 4, which is made of copper in this embodiment, is formed only on the first contact surface 3.1 of the first plating layer 3, which is made of the same material as the bonding pad, the third contact surface 4.1 of the second plating layer 4 is used for bonding the IGBT bonding pad, and the third contact surface 4.1 of the second plating layer 4 has a rough surface formed by surface roughening treatment.
A fourth embodiment;
referring to fig. 4 in conjunction with fig. 1, the present invention provides an IGBT welded module frame metal terminal, including:
the terminal body 1 is punched and cut into a preset shape required by welding a module frame, the rectangular shape is taken as an example in the embodiment, the terminal body is made of a first ultrasonic weldable metal, and the copper is adopted in the embodiment;
a welding end portion 2 formed on the terminal body 1 for welding with an IGBT substrate land;
a first plating layer 3 formed on the outer surface of the plasma-cleaned welding end portion 2 and made of a second ultrasonically-weldable metal, in this embodiment, nickel is used and divided into a first contact surface 3.1 and a second contact surface 3.2, the first contact surface 3.1 is used for welding an IGBT welding area, and the second contact surface 3.2 is used for contacting an ultrasonic welding head;
a plurality of metal projections 5, made of copper in the present embodiment, are uniformly distributed on the first plating layer 3, made of the same material as the welding ends.
The first contact surface 3.1 has a rough surface formed by surface roughening treatment, the welding end parts 2 are arranged on the terminal main body 1 in parallel in groups, at least one indentation is formed at the joint of the welding end part 2 and the terminal main body 1, and the width of the joint of the welding end part 2 and the terminal main body 1 is smaller than that of the welding end part.
Alternatively, the fourth embodiment described above is further modified by a plurality of metallic projections 5, formed only on the first contact surface 3.1 of the first plated layer 3, which are made of the same material as the welded ends.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.
Claims (10)
1. An IGBT welding module frame metal terminal, characterized in that includes:
a terminal body stamped and cut into a predetermined shape required for welding a module frame, the terminal body being made of a first ultrasonically weldable metal;
a welding end portion formed on the terminal main body for welding with the IGBT substrate land;
the first plating layer is formed on the outer surface of the welding end part after plasma cleaning, is made of a second ultrasonic welding metal and is divided into a first contact surface and a second contact surface, the first contact surface is used for welding an IGBT welding area, and the second contact surface is used for contacting an ultrasonic welding head;
wherein, the first contact surface has a rough surface formed by surface roughening treatment.
2. The IGBT welded module frame metal terminal of claim 1, wherein: the welding ends are arranged in groups in parallel on the terminal main body.
3. The IGBT welded module frame metal terminal of claim 1, wherein: the joint of the welding end part and the terminal main body is provided with an indentation.
4. The IGBT welded module frame metal terminal of claim 1, wherein: the width of the joint of the welding end part and the terminal main body is smaller than that of the welding end part.
5. The IGBT welded module frame metal terminal of claim 4, wherein: the shape and area of the welding end part are the same as those of the IGBT substrate welding area.
6. The IGBT welded module frame metal terminal of claim 1, further comprising:
and a second plating layer formed on the first plating layer and made of the same material as the welding end, wherein a third contact surface of the second plating layer is used for welding the IGBT welding area, and the third contact surface of the second plating layer has a rough surface formed by surface roughening treatment.
7. The IGBT welded module frame metal terminal of claim 1, further comprising:
and a second plating layer formed only on the first contact surface of the first plating layer and made of the same material as the welding end portion, wherein a third contact surface of the second plating layer is used for welding the IGBT welding area, and the third contact surface of the second plating layer has a rough surface formed by surface roughening treatment.
8. The IGBT welded module frame metal terminal of claim 1, further comprising:
and a plurality of metal protrusions which are uniformly distributed on the first plating layer and are made of the same material as the welding end parts.
9. The IGBT welded module frame metal terminal of claim 1, further comprising:
and a plurality of metal projections formed only on the first contact surface of the first plating layer, which are made of the same material as the welding end portion.
10. The IGBT welded module frame metal terminal of claim 1, wherein: the terminal body and the soldering terminal portion are made of copper, and the first plating layer is made of nickel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121649424.2U CN215342572U (en) | 2021-07-20 | 2021-07-20 | IGBT welding module frame metal terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121649424.2U CN215342572U (en) | 2021-07-20 | 2021-07-20 | IGBT welding module frame metal terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215342572U true CN215342572U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121649424.2U Active CN215342572U (en) | 2021-07-20 | 2021-07-20 | IGBT welding module frame metal terminal |
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|---|---|
| CN (1) | CN215342572U (en) |
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2021
- 2021-07-20 CN CN202121649424.2U patent/CN215342572U/en active Active
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