CN105405820B - A kind of power module and its packaging method - Google Patents

A kind of power module and its packaging method Download PDF

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Publication number
CN105405820B
CN105405820B CN201510923764.2A CN201510923764A CN105405820B CN 105405820 B CN105405820 B CN 105405820B CN 201510923764 A CN201510923764 A CN 201510923764A CN 105405820 B CN105405820 B CN 105405820B
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electrode
power module
module
power
metal
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CN105405820A (en
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吴振兴
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BEIJING JINGCHUAN ELECTRONIC TECHNOLOGY DEVELOPMENT Co Ltd
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BEIJING JINGCHUAN ELECTRONIC TECHNOLOGY DEVELOPMENT Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00Details of semiconductor or other solid state devices
    • H01L23/48Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/50Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/50Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
    • H01L21/60Attaching or detaching leads or other conductive members, to be used for carrying current to or from the device in operation
    • H01L21/607Attaching or detaching leads or other conductive members, to be used for carrying current to or from the device in operation involving the application of mechanical vibrations, e.g. ultrasonic vibrations
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00Articles made by soldering, welding or cutting
    • B23K2101/36Electric or electronic devices

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)

Abstract

The invention discloses a kind of power module and its packaging method, wherein, the power module includes:Module housing main body, carry modular circuit cover copper circuit board, which is characterized in that further include:Through the metal electrode for being fixed on the module housing main body;Wherein, the metal electrode includes:It extends the electrode contact outside the power module and the electrode welding portion of covering copper circuit board is extended in the power module;The metal in the electrode welding portion is welded as a whole by ultrasonic welding technique and the copper foil for covering copper circuit board.With the application of the invention, can ensure the secured and reliability of the pad of power module, while simplify technique, improve the production efficiency of power module, and save power module inner space, in favor of the miniaturization of power module.

Description

A kind of power module and its packaging method
Technical field
The present invention relates to electronic technology field, specifically, the present invention relates to a kind of power module and its packaging methods.
Background technology
Power module be power power electronic device by certain function combine embedding into module.Common power module Including, metal oxide layer-semiconductor-field-effect transistor, abbreviation metal-oxide half field effect transistor (Metal-Oxide- Semiconductor Field-Effect Transistor, MOSFET) module, IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor) module, diode (led) module etc..
In the encapsulation technology of conventional power module, what middle low power module electrodes used is mostly common soldering process. But the mutual contact mode of traditional middle low power soldering process, tin welding spot contact material resistivity is high, and material contacting surface is different materials Matter is very easy to layering, comes off, leads to the secured low with reliability of pad.
To ensure the secured and reliability of electrode welding point, middle high power module generally uses aluminium wire bonding technology.Aluminium wire Welding procedure is realized by the following manner:In module frame injection molding, by the power terminal of electrode and control terminal one And be molded into module frame, and barish metal island is reserved inside module frame, it is bonded to module for aluminium wire Interior circuit.
But it was found by the inventors of the present invention that due in middle high power module electric current it is bigger, the area of metal island needs Sufficiently large space to be reserved to bind more even tens of aluminium wires, realizes that technique is very cumbersome, production efficiency is very low, and And due to needing to reserve sufficiently large space for metal island, it is unfavorable for the miniaturization production of power module.
Invention content
The embodiment of the present invention is directed to the shortcomings that existing power module, proposes a kind of power module and its packaging method, uses To ensure the secured and reliability of the pad of power module, while simplify technique, improve the production efficiency of power module, and save Power module inner space is saved, in favor of the miniaturization of power module.
The embodiment of the present invention provides a kind of power module according on one side, including:Module housing main body is welded with Modular circuit covers copper circuit board, which is characterized in that further includes:Through the metal electrode for being fixed on the module housing main body; Wherein, the metal electrode includes:It extends the electrode contact outside the power module and prolongs in the power module Extend to the electrode welding portion for covering copper circuit board;The metal in the electrode welding portion covers copper electricity by ultrasonic welding technique with described The copper foil of road plate is welded as a whole.
The embodiment of the present invention additionally provides a kind of packaging method of power module according on the other hand, including:By metal Electrode runs through the module housing main body for being fixed on the power module;Wherein, the metal electrode includes:Extend the power Electrode contact outside module and the electrode for the covering copper circuit board weldering that the power module is extended in the power module Socket part;The electrode welding portion is welded as a whole by ultrasonic welding technique and the copper circuit board that covers.
In technical scheme of the present invention, due to using ultrasonic welding technique, so as to which in welding body, there is no welding circles Face, welding material combine together, and very securely, solder joint shearing force is more than 300N;The welding for being far longer than traditional technology module is strong Degree, reliability greatly improve, longer life expectancy.Traditional aluminium wire keying posts technology modules are by influences such as temperature cycles, power cycles. Usually make pad interfacial fatigue, phenomena such as aluminium wire is broken, electrode terminal comes off occur.The terminal of ultrasonic welding is not in Problem above.Greatly improve the reliability of power module, more than the service life increases by 500.Substantially increase the jail of electrode welding point Gu and reliability.
Moreover, Ultrasonic welding processes can automatically remove the oxide layer of welding material contact surface, ultrasonic welding process is one Of short duration high frequency friction process even if welding material surface can also be removed there are oxide layer by friction, does not influence welding quality.Before The soldering method to continue and aluminium wire bonding method are given an account of, is all limited by the oxide layer on welding material surface.
Further, the pad that ultrasonic terminal welding technique is formed, because there is no interfacial state, interface contact resistance 0, Greatly reduce the resistance of electrode welding point.
Further, in ultrasonic terminal welding technique, welding surface is directly by the electrode welding portion of electrode with covering copper circuit board phase The area of contact determines that effective area is big, but is not take up space, thus conducting resistance is extremely low.The module of aluminium wire bonding techniques, by In the equivalent bonding area very little of aluminium wire, so conducting resistance is very big, even weld tens of aluminium wires simultaneously, conducting resistance according to Cannot so it ignore.Ultrasonic terminal welding technique terminal conducting resistance is 5-10 times lower than aluminium wire weld interface conducting resistance;
Further, ultrasonic terminal welding technique efficiency is very high, and a solder joint welding only needs 1s can be completed, in addition row Work, the 5s such as journey preparation can complete the welding of a solder joint;And the module of aluminium wire welding machine technology is led due to weld interface to be reduced Be powered resistance, and each power electrode terminal is often required for welding tens of aluminium wires, very cumbersome.The life of ultrasonic terminal welding module It produces efficiency and improves 10 times or so than traditional aluminium wire terminal soldering connection module.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings Obtain other attached drawings.
Fig. 1 shows the structure diagram inside power module of the embodiment of the present invention;
Fig. 2 a, 2b show a power module concrete structure schematic diagram of the embodiment of the present invention;
Fig. 3 shows the packaging method flow chart of power module of the embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete Whole description, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts Embodiment shall fall within the protection scope of the present invention.
Those skilled in the art of the present technique are appreciated that unless expressly stated, singulative " one " used herein, " one It is a ", " described " and "the" may also comprise plural form.It is to be further understood that is used in the specification of the present invention arranges Diction " comprising " refers to there are the feature, integer, step, operation, element and/or component, but it is not excluded that presence or addition Other one or more features, integer, step, operation, element, component and/or their group.It should be understood that when we claim member Part is " connected " or during " coupled " to another element, it can be directly connected or coupled to other elements or there may also be Intermediary element.In addition, " connection " used herein or " coupling " can include wireless connection or wireless coupling.It is used herein to arrange Take leave whole or any cell and all combination of the "and/or" including one or more associated list items.
Those skilled in the art of the present technique are appreciated that unless otherwise defined all terms used herein are (including technology art Language and scientific terminology), there is the meaning identical with the general understanding of the those of ordinary skill in fields of the present invention.Should also Understand, those terms such as defined in the general dictionary, it should be understood that have in the context of the prior art The consistent meaning of meaning, and unless by specific definitions as here, the meaning of idealization or too formal otherwise will not be used To explain.
The present inventor is it is considered that when encapsulating power module, using ultrasonic welding technique.Ultrasonic bonding Principle:When ul-trasonic irradiation is in thermoplasticity object, ultrasonic wave can be transmitted on thermoplasticity object, and it is made to generate high frequency vibrating It is dynamic.After this object is contacted with welding object object, the contact surface of two articles can generate high-frequency vibration and the friction of atom level, into And generate the instantaneous high-temperature of part.The surfacing of contact surface is made to melt rapidly, after certain pressure is applied, two surfaces are melted The substance of change can interpenetrate to other side, be fused into one.After ultrasonic wave transmission is stopped, the atom of thermoplastic substance or molecule weight New coagulation forming, material is thus formed firm combinations, realize material welding.The welding region that ultrasonic bonding is formed, does not have There is a weld interface, intensity is close to the intensity of raw material.
Ultrasonic bonding is suitable for the welding between plastics, the welding being also applied between various of the same race and dissimilar metal, plastics Welding has been widely used in various fields.Metal welding is also only limited to the mutual of various metal wires and battery pole piece etc. at present Connection welding.
Based on this, technical scheme of the present invention realizes inside modules electrode bind mode by ultrasonic welding technique:Work( The metal electrode of rate module is injected into one-pass molding in the module housing main body of power module.Moreover, metal electrode is in power Bearer circuit in electrode welding portion and power module is covered copper by inside modules extraction electrode weld part by ultrasonic welding machine Circuit board is welded.Due to being frozen into again by ultrasonic bonding, electrode and the atom or molecule that cover between copper circuit board Type forms firm combination, substantially increases the secured and reliability of welding.Simultaneously ultrasonic welding technique it is simple for process, It is easy to automatic assembly line production, the production efficiency of power module can be improved.
Moreover, the module of the aluminium wire bonding techniques of the prior art, since metal island takes up space greatly, and the equivalent weldering of aluminium wire Junction accumulates very little, so both having occupied many module interior spaces, and conducting resistance is very big, even welds tens of aluminium simultaneously Silk, conducting resistance cannot still be ignored;And in technical solution of the present invention, copper electricity directly by electrode welding portion and is covered in electrode welding face The area of the contact surface of road plate determines that effective area is big, and conducting resistance is extremely low, while occupies module interior space very little, is conducive to The miniaturization of power module.
The technical solution of the embodiment of the present invention is illustrated below in conjunction with the accompanying drawings.
A kind of power module provided in an embodiment of the present invention, internal structure as shown in Figure 1, including:Module housing main body 101st, through being fixed on the metal electrode 102 of the module housing main body, cover copper circuit board 103.
Wherein, module housing main body 101 can be specifically thermoplastic resin material.
Metal electrode is specifically run through and is fixed in module housing main body 101 using injection condensation process, including:It extends Electrode contact outside the power module and the electrode welding for covering copper circuit board 103 is extended in the power module Portion.Preferably, metal electrode material can be specifically copper, nickel-clad copper or silver-plated copper.
For example, the metal electrode of power module can be specifically coordination electrode 1021, the external driving control of electrode contact Circuit processed, electrode welding portion, which is welded in, covers copper circuit board 103.
Alternatively, the metal electrode of power module can be specifically power electrode 1022, it is responsible for the input and output of power current, For its electrode contact to be connected with the circuit outside power module, electrode welding portion, which is welded in, covers copper circuit board 103.
For example, Fig. 2 a, 2b show a specific power module architectures, frame includes:Upper cover plate 202, lower cover 201 and the module housing main body 101 (being not shown in module housing main body Fig. 2 a, 2b) that is set between the above, the lower lid.On Cover board 202, lower cover 201 are by the warm such as PET (polyethylene terephthalate), PBT (polybutylene terephthalate (PBT)) Plastic material injection molding has metal electrode to be embedded in interior, symmetrical along Y-axis.Five rectangular lug bosses are set on upper cover plate 202 Divide, be the top 204,205 of two power inputs of module respectively, the power input is the metal electricity for being embedded with diplopore There are one, M5 or M6 nuts in pole in each electrode hole, for the fixation of electrode and external module;It is additionally provided on upper cover plate 202 The top 206,207,208 of three power take-offs is wherein embedded with the metal electrode of single hole, have in similary each electrode hole M5 or One, M6 nuts, for the fixation of electrode and external module.The rectangular resin cover board of circular arc that upper cover plate carries card slot for one, covering All exposed electrodes and internal circuit inside lower cover.
The substructure being located in lower cover 201 of the power input of module and power take-off respectively as Fig. 2 a, In 2b 209,210,211,212,213 shown in;Wherein, the electrode hole positioned at the top of the power input of upper cover plate is with being located at The electrode hole of the lower part of the power input in lower cover connects;Equally, positioned at the top of the power take-off of upper cover plate Electrode hole and the electrode hole of lower part of the power take-off in the lower cover connect.Power input is located at upper cover The electrode hole of plate, as the electrode contact extended outside power module of metal electrode, and power input runs through module Housing main body 101 extends to the part for covering copper circuit board 103 as electrode welding portion in power module.Equally, power output The electrode hole positioned at upper cover plate at end, as the electrode contact extended outside power module of metal electrode, and power is defeated Outlet runs through module housing main body 101, and the part for covering copper circuit board 103 is extended in power module as electrode welding portion.
The substructure of power input and power take-off surrounds one by the hollow square cylindrical bodies of an oblique angle section A cylindrical structure composition, interior cylinder is hollow design, and there is hexagonal groove in inside, and metal nuts are placed in inside.
Six groups of acicular terminals 230, every group of two acicular terminals are shared on the upper cover plate of power module as shown in Fig. 2 a, 2b 230 composition, be power module coordination electrode, external PCB driving plates.
Preferably, the electrode welding portion of metal electrode is bent, footrest shape as shown in Figure 1 is formed, in order to covering Copper circuit board 103 is welded.In fact, the electrode welding portion of footrest shape includes the gold parallel with covering copper circuit board 103 Belong to piece, further include the support metallic object that electrode contact is connected to from the sheet metal;The shape of the sheet metal can be it is rectangular, Round or dome is rectangular, area 4cm2-16cm2;The support metallic object can be forniciform or straight, ability Field technique personnel can be designed according to the concrete structure of power module inner space.
In the electrode welding portion of metal electrode 102, area that welding surface is directly in contact by sheet metal with covering copper circuit board It determines, effective area is big, but is not take up space, thus conducting resistance is extremely low.The module of aluminium wire bonding techniques, due to aluminium wire etc. Bonding area very little is imitated, so conducting resistance is very big, even welds tens of aluminium wires simultaneously, conducting resistance cannot still neglect Slightly.Ultrasonic terminal welding technique terminal conducting resistance is 5-10 times lower than aluminium wire weld interface conducting resistance.Moreover, ultrasonic terminal soldering The pad that connection technology is formed, because there is no interfacial state, interface contact resistance 0 greatly reduces the electricity of electrode welding point Resistance.
Due to using ultrasonic welding technique, so as to which in welding body, there is no weld interface, welding material combines together, Very securely, solder joint shearing force is more than 300N (300 Ns);It is far longer than the weld strength of traditional technology module, reliability is substantially It improves, longer life expectancy.
It can be specifically to cover copper ceramics DBC plates to cover copper circuit board 103.The front and back of DBC plates be all attached with one layer it is solid Copper foil, while play the role of conductive and heat-conductive.DBC plates are loaded with bridge circuit;Preferably, the bridge circuit is made of chip. DBC plates marginal position there are associated metal electrode extraction welding region, by ultrasonic welding technique by metal electrode Electrode welding portion and the copper product in respective lands domain welded.Preferably, cover the copper foil of the welding region of copper circuit board Material can be specifically copper.
For example, in power module as shown in Fig. 2 a, 2b, metal base plate 203 is to cover copper circuit board 103, is rectangular Shape structure, is copper nickel-plated metal, and there are four circular hole, as fixation mounting hole, M5 or M6 screws and radiator etc. can be used in quadrangle After component is fixed, it is placed in lower cover 201.201 outside of lower cover, positioned at the both sides of metal base plate 203 (covering copper circuit board) The operation hole of three asymmetric semi-circular recesses 218,219,220 is designed, the power module is fixed on work top, due to The power module is symmetrical design, prevents from misplacing dress function so this three asymmetric operation holes also have.Meanwhile lower cover Along two long sides of metal base plate (covering copper circuit board) inside 201, it is designed with multiple rectangular recess 221, the work of these grooves With being the shrinkage stress that reduces in injection molding process, while material stress can be reduced.All corners of power module are whole Fillet processing is done, this design can make product smoothly demould and be promoted in process of production degree of being designed beautifully and touch feeling; Moreover, the PET material shunk and become bigger can be used to realize, can also be realized with the smaller PBT material of no-load voltage ratio is shunk.
Above-mentioned upper cover plate 202 is by the thermoplastic materials injection molding such as PET or PBT, for filleted corner square structure, center Symmetrically.
Above-mentioned power module can be specifically MOSFET modules, IGBT module or diode (led) module, and packaging method has Body flow is as shown in figure 3, include the following steps:
S301:Metal electrode 102 is run through to the module housing main body 101 for being fixed on power module.
In this step, metal electrode 102 is fixed on to the module housing main body 101 of power module using injection condensation process In, and metal electrode 102 through module housing main body 101, is extended to outside power module, in order to outside power module Circuit is attached;Meanwhile metal electrode 102 extends in the power module and covers copper circuit board 103, in order to covering copper Circuit board 103 welds.
S302:The electrode welding portion of metal electrode 102 is welded as by ultrasonic welding technique with covering copper circuit board 103 One.
Specifically, the soldering tip of ultrasonic brazing unit is pressed on to the electrode welding portion of metal electrode 102 so that electrode welds After socket part is contacted with covering the welding region of copper circuit board, high-frequency vibration is generated, so that the contact surface of two articles generates atom The high-frequency vibration of grade and friction, and then the instantaneous high-temperature of part is generated, the surfacing of contact surface is made to melt rapidly, is applying one After fixed pressure, the substance of two surface meltings can interpenetrate to other side, be fused into one.
Preferably, in view of during ultrasonic bonding, mechanical oscillation are to covering the influence of device on copper circuit board, while again Ensure welding quality, the technological parameter of the ultrasonic welding used in technical solution of the present invention includes:1. power bracket 800W- 3.5KW (800 watts -3.5 kilowatts);2. energy 60J-200J (60 cokes -200 are burnt);3. (50 N -100 of pressure limit 50N-100N Ox);4. amplitude 30um-70um (30 microns -70 microns);5. time 0.5s-1s (- 1 second 0.5 second).
Using the technological parameter of above-mentioned ultrasonic welding, it is ensured that electrode and the good welds between copper circuit board are covered, Simultaneously so that mechanical oscillation, which are in, covers copper circuit board and its in the range of device can bear, the damage of circuit is avoided.
Due to using ultrasonic welding technique, so as to which in welding body, there is no weld interface, welding material combines together, Very securely, solder joint shearing force is more than 300N;It is far longer than the weld strength of traditional technology module, reliability greatly improves, the longevity It orders longer.Traditional aluminium wire keying posts technology modules are by influences such as temperature cycles, power cycles.Usually make pad interface tired There is phenomena such as aluminium wire is broken, electrode terminal comes off in labor.The terminal of ultrasonic welding is not in problem above.Make power module Reliability greatly improve, more than the service life increases by 500.Substantially increase the secured and reliability of electrode welding point.
Moreover, Ultrasonic welding processes can automatically remove the oxide layer of welding material contact surface, ultrasonic welding process is one Of short duration high frequency friction process even if welding material surface can also be removed there are oxide layer by friction, does not influence welding quality.Before The soldering method to continue and aluminium wire bonding method are given an account of, is all limited by the oxide layer on welding material surface.
Ultrasonic terminal welding technique efficiency is very high, and a solder joint welding only needs 1s can be completed, in addition preparation for journey Work are waited, 5s can complete the welding of a solder joint;And the module of aluminium wire welding machine technology is due to weld interface conducting resistance to be reduced, Each power electrode terminal is often required for welding tens of aluminium wires, very cumbersome.The production efficiency of ultrasonic terminal welding module 10 times or so are improved than traditional aluminium wire terminal soldering connection module.
S303:Complete the overall package of power module.
Specifically, copper circuit board will be covered to be assemblied in the module housing ligand of power module, and by module housing ligand with The overall package of power module is realized in the 101 mating installation of module housing main body.
To sum up, in technical scheme of the present invention, due to using ultrasonic welding technique, so as to which in welding body, there is no welderings Border face, welding material combine together, and very securely, solder joint shearing force is more than 300N;It is far longer than the weldering of traditional technology module Intensity is connect, reliability greatly improves, longer life expectancy.Traditional aluminium wire keying posts technology modules are by temperature cycles, power cycle etc. It influences.Usually make pad interfacial fatigue, phenomena such as aluminium wire is broken, electrode terminal comes off occur.The terminal of ultrasonic welding, will not There is problem above.Greatly improve the reliability of power module, more than the service life increases by 500.Substantially increase electrode welding point Secured and reliability.
Moreover, Ultrasonic welding processes can automatically remove the oxide layer of welding material contact surface, ultrasonic welding process is one Of short duration high frequency friction process even if welding material surface can also be removed there are oxide layer by friction, does not influence welding quality.Before The soldering method to continue and aluminium wire bonding method are given an account of, is all limited by the oxide layer on welding material surface.
Further, the pad that ultrasonic terminal welding technique is formed, because there is no interfacial state, interface contact resistance 0, Greatly reduce the resistance of electrode welding point.
Further, in ultrasonic terminal welding technique, welding surface is directly by the electrode welding portion of electrode with covering copper circuit board phase The area of contact determines that effective area is big, but is not take up space, thus conducting resistance is extremely low.The module of aluminium wire bonding techniques, by In the equivalent bonding area very little of aluminium wire, so conducting resistance is very big, even weld tens of aluminium wires simultaneously, conducting resistance according to Cannot so it ignore.Ultrasonic terminal welding technique terminal conducting resistance is 5-10 times lower than aluminium wire weld interface conducting resistance.
Further, ultrasonic terminal welding technique efficiency is very high, and a solder joint welding only needs 1s can be completed, in addition row Work, the 5s such as journey preparation can complete the welding of a solder joint;And the module of aluminium wire welding machine technology is led due to weld interface to be reduced Be powered resistance, and each power electrode terminal is often required for welding tens of aluminium wires, very cumbersome.The life of ultrasonic terminal welding module It produces efficiency and improves 10 times or so than traditional aluminium wire terminal soldering connection module.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice invention disclosed herein Its embodiment.This application is intended to cover the present invention any variations, uses, or adaptations, these modifications, purposes or Person's adaptive change follows the general principle of the present invention and including the undocumented common knowledge in the art of the disclosure Or conventional techniques.Description and embodiments are considered only as illustratively, and true scope and spirit of the invention are by following Claim is pointed out.
It should be understood that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is only limited by appended claim.

Claims (10)

1. a kind of power module, including:Module housing main body, carry modular circuit cover copper circuit board, which is characterized in that also Including:Through the metal electrode for being fixed on the module housing main body;The module housing main body is thermoplastic resin material, with And the metal electrode is by being molded condensation process through being fixed on the module housing main body;
Wherein, the metal electrode includes:Extend electrode contact outside the power module and in the power module Inside extend to the electrode welding portion for covering copper circuit board;
The metal in the electrode welding portion is welded as a whole by ultrasonic welding technique and the copper foil for covering copper circuit board;
The power module further comprises:Upper cover plate and lower cover;Wherein, the circular arc side that the upper cover plate carries card slot for one Shape resin cover board, all exposed electrodes and internal circuit inside covering lower cover, the module housing main body be set to it is described it is upper, Between lower cover;
The top of power input or power take-off is provided on the upper cover plate;
The lower part of power input or power take-off is provided in the lower cover;
The electrode hole on the top of the power input and the electrode hole of the lower part of the power input penetrate through;
The electrode hole on the top of the power take-off and the electrode hole of the lower part of the rate output terminal penetrate through;
The electrode contact that extends the power module outside of the electrode hole as the metal electrode;
Along two long sides for covering copper circuit board inside the lower cover, it is designed with multiple rectangular recess;
The substructure of the power input or the power take-off is surrounded by the hollow square cylindrical bodies of an oblique angle section One cylindrical structure composition, the interior cylinder is hollow design, and there is hexagonal groove in inside, and metal nuts are placed in inside.
2. power module as described in claim 1, which is characterized in that the metal electrode is specially power electrode or control Electrode.
3. power module as described in claim 1, which is characterized in that the electrode welding portion is specially footrest shape, including: With the support metallic object for covering the parallel sheet metal of copper circuit board and electrode contact is connected to from the sheet metal.
4. power module as claimed in claim 3, which is characterized in that the shape of the sheet metal is specially rectangular, it is round or Dome is rectangular.
5. power module as claimed in claim 4, which is characterized in that the area of the sheet metal is 4cm2-16cm2
6. power module as claimed in claim 5, which is characterized in that the power input is the metal electricity of embedded diplopore Pole, the power take-off are the metal electrode of embedded single hole.
7. power module as claimed in claim 6, which is characterized in that the copper circuit board that covers is placed in the lower cover.
8. power module as claimed in claim 7, which is characterized in that on the outside of the lower cover, positioned at covering the two of copper circuit board There are three the operation holes of asymmetric semi-circular recesses for side design.
9. the power module as described in claim 1-8 is any, which is characterized in that the metal electrode material is specially:Copper, plating Ambrose alloy or silver-plated copper;And the copper foil material is specially copper.
10. the power module as described in claim 1-8 is any, which is characterized in that the power module is specially MOSFET moulds Block, IGBT module or diode (led) module.
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CN106533133A (en) * 2016-12-01 2017-03-22 南通沃特光电科技有限公司 Packaging method of high-voltage frequency converter power unit

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CN102800833A (en) * 2012-08-31 2012-11-28 江苏宏微科技股份有限公司 Electrode terminal of power module and welding method thereof
CN103779305A (en) * 2014-01-24 2014-05-07 嘉兴斯达微电子有限公司 Metal connecting piece and power semiconductor module
CN103928447A (en) * 2013-01-14 2014-07-16 内蒙航天动力机械测试所 Large-power full-airtight semiconductor module packaging structure
CN205231047U (en) * 2015-12-14 2016-05-11 北京晶川电子技术发展有限责任公司 Power module

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CN102800833A (en) * 2012-08-31 2012-11-28 江苏宏微科技股份有限公司 Electrode terminal of power module and welding method thereof
CN103928447A (en) * 2013-01-14 2014-07-16 内蒙航天动力机械测试所 Large-power full-airtight semiconductor module packaging structure
CN103779305A (en) * 2014-01-24 2014-05-07 嘉兴斯达微电子有限公司 Metal connecting piece and power semiconductor module
CN205231047U (en) * 2015-12-14 2016-05-11 北京晶川电子技术发展有限责任公司 Power module

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