CN102800833A - Electrode terminal of power module and welding method thereof - Google Patents
Electrode terminal of power module and welding method thereof Download PDFInfo
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- CN102800833A CN102800833A CN2012103150957A CN201210315095A CN102800833A CN 102800833 A CN102800833 A CN 102800833A CN 2012103150957 A CN2012103150957 A CN 2012103150957A CN 201210315095 A CN201210315095 A CN 201210315095A CN 102800833 A CN102800833 A CN 102800833A
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- transverse slat
- end tab
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention relates to an electrode terminal of a power module. The electrode terminal comprises a support saddle and a run-off plate which are integrated, wherein a through hole is formed in the run-off plate; the support saddle comprises a transverse plate and upright plates, wherein the upright plates are arranged at two ends of two sides of the transverse plate and subject to arc curve transition, and moreover, connecting plates outwardly bent are arranged at the bottom of the upright plates; the bottom of the run-off plate is in curve transition to the transverse plate; an intermediate notch on the transverse plate extends to the curve transition part between the transverse plate and the run-off plate; and side notches are respectively arranged on two side surfaces of the curve transition part between the run-off plate and the transverse plate. The electronic terminal of the power module has a reasonable structure and can effectively release the stress caused by a welding part of the electronic terminal when being bent, prolong the service life and improve the welding efficiency.
Description
Technical field
The present invention relates to a kind of power model electrode terminal and welding method thereof, belong to the semi-conductor power module technical field.
Background technology
Power model mainly by semiconductor chip such as igbt chip, cover cermet substrate (DBC), copper soleplate, shell and formations such as I/O electrode terminal and signal terminal; Each electrode terminal is fixed by welding on the metal level that covers the cermet substrate; Each electrode terminal other end passes the top that is arranged on shell behind the outer case bending, installs through securing member and inserts external power source and output power supply.The electrode terminal of power model mostly is made up of flute profile part and extension at present; Its channel-shaped portion is divided into upright groove structure; The inside bending in its bottom also is welded on the metal level that covers the cermet substrate; Its groove width distance of a kind of structure is less, therefore when extension bends, can cause pad stress excessive.Some electrode terminals pass through to increase the groove width distance of dogleg section for this reason, when bending to be released in extension, and the caused stress of its bottom weld.But this kind electrode terminal structure only can unidirectional Stress Release, can not satisfy growing high power module.
And the electrode terminal on the existing power model all through the scolder high temperature sintering on the metal level that covers the cermet substrate; And cover the cermet substrate is that metal forming at high temperature is bonded directly to aluminium oxide (AL2Q3) or aluminium nitride (ALN) ceramic substrate surface; In welding process, high temperature can make the metal level and the electrode terminal that cover the cermet substrate produce welding stress at the solder layer place down, and the operational environment of power model is to circulate at-40 ℃ to 125 ℃; Therefore after after a while; Can cause that finally metal level and the electrode terminal junction of covering the cermet substrate come off, and produce the solder joint fatigue phenomenon, thereby have influence on the life-span of overall power device.Secondly; Electrode terminal adopts scolder to be welded on the metal level that covers the cermet substrate; Not only higher to layer on surface of metal and the electrode terminal surface requirements of covering the cermet substrate; Especially cover between the copper of Copper Foil and electrode terminal of cermet substrate and also can have the thermal expansion difference, so make its welding performance not high, and influence its electric conductivity.Moreover electrode terminal is through the scolder high temperature sintering on the metal level that covers the cermet substrate time, the protective gas when welding process not only needs scolder, scaling powder and welding; And the high temperature sintering welding sequence time is long, and the high temperature that is especially produced is prone to cause the reduction of other part material metallic characters again, adds the factors such as scolder trickling and resistance solder paste China ink in the welding process; The risk that also can cause solder side to stain; Because solder side is wayward, technological operation is complicated, and welding efficiency is low.
Summary of the invention
The purpose of this invention is to provide a kind of rational in infrastructurely, the caused stress of its weld in the time of effectively discharging electrode terminal and bend improves the power model electrode terminal and the welding method thereof of useful life and welding efficiency.
The present invention is that the technical scheme that achieves the above object is: a kind of power model electrode terminal; It is characterized in that: said electrode terminal comprises the bearing and the end tab of one; End tab is provided with through hole; Bearing comprises transverse slat and is arranged on transverse slat two ends or both sides and the riser through arc transition, and the riser bottom has the connecting plate of outside bending, the end tab bottom through arc transition to transverse slat; Median slot on the transverse slat extends to the arc transition place of transverse slat and end tab, and the two sides at the arc transition place of end tab and transverse slat have the side channel mouth respectively.
The present invention is the welding method of power model electrode terminal that achieves the above object, and it is characterized in that: the connecting plate on its bearing of said electrode terminal through ultrasonic wire bonding on the metal level that covers the cermet substrate.
The present invention has the following advantages after adopting technique scheme:
1, electrode terminal of the present invention comprises bearing and end tab; Its bearing comprises transverse slat and riser and connecting plate again; Because through arc transition, arc transition is also adopted with transverse slat and connecting plate respectively in the two ends of riser between end tab and the transverse slat, so the stress that welding portion is caused can reduce the end tab bending time; Because connecting plate is positioned at the outside of riser, is convenient to carry out ultrasonic bonding.The present invention is provided with median slot on transverse slat; Being respectively equipped with the side channel mouth in the two sides at the arc transition place of end tab and transverse slat in addition, making the stress of welding position can more early begin to disperse and discharge through each notch, is the Stress Release ability of X axle, Y axle and Z axle in all directions so can improve electrode terminal; Optimize the strain relief of electrode terminal; Not only can realize ultrasonic welding process, and improve soldering reliability, recycle in the process at power model; Can reduce the solder joint fatigue phenomenon effectively, improve the life-span of overall power device.
2, electrode terminal of the present invention adopts ultrasonic bonding on the metal level that covers the cermet substrate; The technology that replaces traditional scolder welding; Therefore the copper on the electrode terminal and cover the difference that does not have thermal expansion between the paper tinsel on the cermet substrate between the copper; Welding reliability is improved, through 300 temperature cycling tests, basic no change before and after the electrode terminal pulling force.The present invention simultaneously adopts the ultrasonic wire bonding technology, makes the good conductivity of its tie point, the extremely low or near-zero of resistance coefficient.
3, the present invention is connected through connecting plate electrode terminal through the ultrasonic bonding technology with the metal level that covers the cermet plate; Layer on surface of metal and electrode terminal surface requirements to covering the cermet plate are lower, when surface both oxidation or electroplating other metals all can realize welding.
4, electrode terminal of the present invention adopts ultrasonic bonding covering the cermet substrate, than traditional welding technology, and the protective gas when welding process does not need scolder, scaling powder and welding; The industrialization operation is simplified greatly, has reduced the product resource input, has improved welding efficiency; The present invention need not carry out high temperature sintering, can not produce spark in the welding process, and storeroom does not produce high temperature; Can not cause other part material metallic character reductions by Yin Gaowen, avoid in the conventional solder welding procedure scolder trickling simultaneously yet; Factors such as resistance solder paste China ink are to the risk of contamination of device surface, make weld to be electrically connected area savings over half, the control of solder side is simplified.
Description of drawings
Below in conjunction with accompanying drawing embodiments of the invention are done further to describe in detail.
Fig. 1 is one of structural representation of electrode terminal of the present invention.
Fig. 2 be electrode terminal of the present invention structural representation two.
Fig. 3 is that electrode terminal of the present invention is pressed in the structural representation that covers on the cermet substrate through supersonic welding.
Fig. 4 is the structural representation after electrode terminal of the present invention bends.
Wherein: the 1-connecting plate, the 2-riser, the 3-transverse slat, the 4-end tab, 5-bending notch, the 6-through hole, the 7-median slot, 8-side channel mouth, 9-base plate, 10-cover the cermet substrate, 11 shells, 11-1-electrode tip holder.
Embodiment
See Fig. 1, shown in 2, power model electrode terminal of the present invention comprises the bearing and the end tab 4 of one; End tab 4 is provided with through hole 6, and end tab 4 is positioned at the bending part and is provided with at least one notch, makes things convenient for the bending of end tab 4; See Fig. 3, shown in 4, the bearing pressure welding of electrode terminal of the present invention is covered cermet substrate 10 and is fixed on the base plate 9 on the metal level that covers cermet substrate 10; This base plate 9 adopts copper soleplate and is connected with radiator, and the heat when power model is worked is forced to shed, and the end tab 4 of electrode terminal of the present invention overlays on shell 11 tops after passing shell 11 and bending; And be arranged on the electrode tip holder 11-1, end tab 4 is positioned at the bending part and is provided with at least one bending notch 5, sees shown in Figure 1; Can adopt two bending notches 5, keep being convenient to the bending of end tab 4 under the electrode terminal mechanical strength; Through hole 6 on the end tab 4 is corresponding with screwed hole on the electrode tip holder 11-1; The input side of electrode terminal is connected with direct current, through securing member the outlet side of electrode terminal is connected with external equipment simultaneously, realize the input and output of power model.
See shown in Figure 1ly, bearing of the present invention comprises transverse slat 3 and is arranged on transverse slat 3 two ends and the riser 2 through arc transition, and riser 2 bottoms have the connecting plate 1 of outside bending, and connecting plate 1 is arranged on the sidepiece of riser 2.See shown in Figure 2; Bearing of the present invention comprises transverse slat 3 and is arranged on the riser 2 that arc transition is also passed through in transverse slat 3 both sides; And riser 2 bottoms have the connecting plate 1 of outside bending; This connecting plate 1 is arranged on the front portion or the rear portion of riser 2, realizes being connected through connecting plate 1 and the metal laminate postwelding that covers cermet substrate 10.
See shown in Fig. 1～4; End tab 4 bottoms of electrode terminal of the present invention are through on arc transition to the transverse slat 3; Median slot 7 on the transverse slat 3 extends to the arc transition place of transverse slat 3 and end tab 4; The top of this median slot 7 surpasses the point of contact of arc transition, and the distance between the point of contact of the top of median slot 7 and arc transition is at 2 ~ 10mm, can be at 5mm or 8mm etc. like this distance; And the two sides at end tab 4 and the arc transition place of transverse slat 3 have side channel mouth 8 respectively, can discharge with side channel mouth 8 counter stresses and disperse through each arc transition place and median slot 7.See shown in Figure 1, when electrode terminal bears the stress that directions X produces, but the arc transition place of transverse slat 3 and two risers 2 and be arranged on median slot 7 on the transverse slat 3 and discharge with side channel mouth 8 counter stress places and disperse; And when electrode terminal bears the stress that the Y direction produced, can discharge and disperse by the arc transition place of transverse slat 3 and end tab 4 and the median slot 7 on the transverse slat 3 and two side channel mouth 8 counter stresses; Bear the stress of Z direction when electrode terminal; Can discharge and disperse through the median slot 7 on arc transition place and the transverse slat 3 between riser 2 and transverse slat 3 and the connecting plate 1 and two side channel mouth 8 counter stresses; See shown in Figure 2; Arc transition place that can be through arc transition place between riser 2 and transverse slat 3 and the connecting plate 1, transverse slat 3 and end tab 4 and the median slot 7 on the transverse slat 3 and two side channel mouth 8 counter stresses discharge and disperse; Owing to increased the Stress Release ability of electrode terminal, improved electrode terminal pressure welding reliability in a plurality of directions.
See shown in Figure 3, the connecting plate 1 on the bearing of the present invention through ultrasonic wire bonding on the metal level that covers cermet substrate 10.When carrying out ultrasonic wire bonding, will cover on the base plate 9 of cermet substrate 10 and chips welding, base plate 9 is fixed on the base; Base top is provided with support and is used to support electrode terminal, with the connecting plate 1 of electrode terminal corresponding to covering assigned address on the cermet substrate 10, during ultrasonic bonding; Aim at the position of connecting plate 1 with the bonding head of electrode terminal earlier through automatic station-keeping system, bonding head is pushed down the connecting plate 1 that electrode terminal need weld, and makes the rhombus point on the bonding head push down connecting plate 1; And apply lateral ultrasonic wave, and make the connecting plate 1 of electrode terminal and cover between the copper metal layer of cermet substrate 10 and rub, form closely contact; Rely on gravitational force between atoms, realize ultrasonic bonding, covering a connecting plate 1 on the metal level of cermet substrate 10 through ultrasonic wire bonding; After accomplishing bonding; Bonding head lifts, playbacks, and repeats the ultrasonic wire bonding of another connecting plate 1 of electrode terminal, circulates with this.
Claims (5)
1. power model electrode terminal; It is characterized in that: said electrode terminal comprises the bearing and the end tab (4) of one; End tab (4) is provided with through hole (6); Bearing comprises transverse slat (3) and is arranged on transverse slat (3) two ends or both sides and the riser (2) through arc transition, and riser (2) bottom has the connecting plate (1) of outside bending, and end tab (4) bottom is through on arc transition to the transverse slat (3); Median slot (7) on the transverse slat (3) extends to the arc transition place of transverse slat (3) and end tab (4), and the two sides at the arc transition place of end tab (4) and transverse slat (3) have side channel mouth (8) respectively.
2. power model electrode terminal according to claim 1 is characterized in that: the top of said median slot (7) surpasses the point of contact of arc transition, and the distance between the point of contact of the top of median slot (7) and arc transition is at 2 ~ 10mm.
3. power model electrode terminal according to claim 1 is characterized in that: said connecting plate (1) is arranged on sidepiece or the front portion or the rear portion of riser (2).
4. power model electrode terminal according to claim 1 is characterized in that: said end tab (4) is positioned at the bending part and is provided with at least one bending notch (5).
5. according to the welding method of claim 1 power model electrode terminal, it is characterized in that: the connecting plate (1) on its bearing of said electrode terminal through ultrasonic wire bonding on the metal level that covers cermet substrate (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210315095.7A CN102800833B (en) | 2012-08-31 | 2012-08-31 | Electrode terminal of power module and welding method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210315095.7A CN102800833B (en) | 2012-08-31 | 2012-08-31 | Electrode terminal of power module and welding method thereof |
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| CN102800833A true CN102800833A (en) | 2012-11-28 |
| CN102800833B CN102800833B (en) | 2015-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210315095.7A Active CN102800833B (en) | 2012-08-31 | 2012-08-31 | Electrode terminal of power module and welding method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103165658A (en) * | 2013-03-18 | 2013-06-19 | 永济新时速电机电器有限责任公司 | Elastic main electrode of insulated gate bipolar translator (IGBT) |
| CN103811441A (en) * | 2014-02-26 | 2014-05-21 | 西安永电电气有限责任公司 | Contact electrode structure for flat-plate crimped IGBT (Insulated Gate Bipolar Translator) module |
| CN104064722A (en) * | 2013-03-22 | 2014-09-24 | 株式会社东芝 | Bus Bar, Electronic Component, And Manufacturing Method Of Electronic Component |
| CN105405820A (en) * | 2015-12-14 | 2016-03-16 | 北京晶川电子技术发展有限责任公司 | Power module and packaging method therefor |
| CN105531068A (en) * | 2013-09-17 | 2016-04-27 | Abb技术有限公司 | Method for ultrasonic welding with particles trapping |
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| JPH11126842A (en) * | 1997-10-22 | 1999-05-11 | Toshiba Corp | Semiconductor device |
| CN101453159A (en) * | 2008-12-26 | 2009-06-10 | 南京银茂微电子制造有限公司 | Power terminal having built-in power terminal |
| CN102024803A (en) * | 2009-09-18 | 2011-04-20 | 株式会社东芝 | Power module |
| CN201927602U (en) * | 2010-11-11 | 2011-08-10 | 嘉兴斯达微电子有限公司 | Power module comprising special power terminal |
| CN202034367U (en) * | 2011-03-04 | 2011-11-09 | 南京银茂微电子制造有限公司 | Power module of non-welding terminal |
| CN202796921U (en) * | 2012-08-31 | 2013-03-13 | 江苏宏微科技股份有限公司 | Power module electrode terminal |
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2012
- 2012-08-31 CN CN201210315095.7A patent/CN102800833B/en active Active
Patent Citations (6)
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| JPH11126842A (en) * | 1997-10-22 | 1999-05-11 | Toshiba Corp | Semiconductor device |
| CN101453159A (en) * | 2008-12-26 | 2009-06-10 | 南京银茂微电子制造有限公司 | Power terminal having built-in power terminal |
| CN102024803A (en) * | 2009-09-18 | 2011-04-20 | 株式会社东芝 | Power module |
| CN201927602U (en) * | 2010-11-11 | 2011-08-10 | 嘉兴斯达微电子有限公司 | Power module comprising special power terminal |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103165658A (en) * | 2013-03-18 | 2013-06-19 | 永济新时速电机电器有限责任公司 | Elastic main electrode of insulated gate bipolar translator (IGBT) |
| CN104064722A (en) * | 2013-03-22 | 2014-09-24 | 株式会社东芝 | Bus Bar, Electronic Component, And Manufacturing Method Of Electronic Component |
| CN105531068A (en) * | 2013-09-17 | 2016-04-27 | Abb技术有限公司 | Method for ultrasonic welding with particles trapping |
| CN103811441A (en) * | 2014-02-26 | 2014-05-21 | 西安永电电气有限责任公司 | Contact electrode structure for flat-plate crimped IGBT (Insulated Gate Bipolar Translator) module |
| CN105405820A (en) * | 2015-12-14 | 2016-03-16 | 北京晶川电子技术发展有限责任公司 | Power module and packaging method therefor |
| CN105405820B (en) * | 2015-12-14 | 2018-06-26 | 北京晶川电子技术发展有限责任公司 | A kind of power module and its packaging method |
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| CN102800833B (en) | 2015-03-18 |
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