CN102800833B - 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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- CN102800833B CN102800833B CN201210315095.7A CN201210315095A CN102800833B CN 102800833 B CN102800833 B CN 102800833B CN 201210315095 A CN201210315095 A CN 201210315095A CN 102800833 B CN102800833 B CN 102800833B
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- electrode terminal
- transverse slat
- end tab
- arc transition
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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 electrode terminal of power module and welding method thereof, belong to semi-conductor power module technical field.
Background technology
Power model primarily of semiconductor chip as igbt chip, cover cermet substrate (DBC), copper soleplate, shell and the formation such as input/output electrode terminal and signal terminal, each electrode terminal be fixed by welding in cover cermet substrate metal level on, be arranged on the top of shell after each electrode terminal other end passes outer case bending, then by securing member, access external power source and output power supply be installed.The electrode terminal of current power model is mostly made up of flute profile part and extension, its channel-shaped portion is divided into vertical groove structure, inside bending bottom it and be welded on cover cermet substrate metal level on, its groove width distance of a kind of structure is less, and pad stress therefore can be caused excessive when extension bends.Some electrode terminals are by increasing the groove width distance of dogleg section for this reason, be released in extension bend time, the stress that its bottom welding place causes.But this kind of electrode terminal structure only can unidirectional Stress Release, can not meet growing high power module.
And electrode terminal on existing power model all by solder high temperature sintering on the metal level covering cermet substrate, and to cover cermet substrate be metal forming is at high temperature bonded directly to aluminium oxide (AL2Q3) or aluminium nitride (ALN) ceramic substrate surface, in welding process, metal level and the electrode terminal that can make to cover cermet substrate under high temperature produce welding stress at solder layer place, and the operational environment of power model circulates at-40 DEG C to 125 DEG C, therefore through after a period of time, the metal level covering cermet substrate and electrode terminal junction finally can be caused to come off, and produce solder joint fatigue phenomenon, thus have influence on the life-span of overall power device.Secondly, electrode terminal adopt solder be welded on cover cermet substrate metal level on, not only higher to the layer on surface of metal and electrode terminal surface requirements that cover cermet substrate, especially cover between the Copper Foil of cermet substrate and the copper of electrode terminal and also can there is thermal expansion difference, so make its welding performance not high, and affect its electric conductivity.Moreover; electrode terminal be by solder high temperature sintering on the metal level covering cermet substrate time; protective gas when welding process not only needs solder, scaling powder and welds; and the high temperature sintering welding sequence time is long, especially produced high temperature easily causes again other part material metallic characters to weaken, and adds the solder trickling in welding process and the factor such as solder mask; also can cause the risk that solder side stains; because solder side is wayward, complex operation, welding efficiency is low.
Summary of the invention
The object of this invention is to provide a kind of rational in infrastructure, effectively can discharge stress when electrode terminal bends caused by its weld, improve electrode terminal of power module and the welding method thereof of useful life and welding efficiency.
The present invention is the technical scheme achieved the above object: a kind of electrode terminal of power module, it is characterized in that: described electrode terminal comprises 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 by the riser of arc transition, and there is bottom riser the connecting plate of outside bending, bottom end tab by arc transition on transverse slat, median slot on 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 side channel mouth respectively.
The present invention is the welding method of electrode terminal of power module of achieving the above object, and it is characterized in that: the connecting plate on its bearing of described electrode terminal by ultrasonic wire bonding on the metal level covering 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 again transverse slat and riser and connecting plate, owing to passing through arc transition between end tab and transverse slat, the two ends of riser also adopt arc transition with transverse slat and connecting plate respectively, so the stress caused welding portion when can reduce end tab bending, because connecting plate is positioned at the outside of riser, be convenient to carry out ultrasonic bonding.The present invention is provided with median slot on transverse slat, in addition side channel mouth is respectively equipped with in the two sides at the arc transition place of end tab and transverse slat, the stress of welding position is made can more early to start dispersion and release by each notch, therefore the Stress Release ability of electrode terminal at all directions and X-axis, Y-axis and Z axis can be improved, optimize the strain relief of electrode terminal, not only ultrasonic welding process can be realized, and also improve soldering reliability, recycle in process at power model, can effectively reduce solder joint fatigue phenomenon, improve the life-span of overall power device.
2, electrode terminal of the present invention adopts ultrasonic bonding on the metal level covering cermet substrate, replace the technology of traditional solder welding, therefore the copper on electrode terminal and cover on cermet substrate between paper tinsel not exist between copper the difference of thermal expansion, the reliability of welding is improved, through 300 temperature cycling tests, substantially unchanged before and after electrode terminal pulling force.Simultaneously the present invention adopts ultrasonic wire bonding technology, makes the good conductivity of its tie point, the extremely low or near-zero of resistance coefficient.
3, electrode terminal is connected with the metal level covering cermet plate by connecting plate by ultrasonic bonding technology by the present invention, lower to the layer on surface of metal and electrode terminal surface requirements that cover cermet plate, when surface both oxidation or electroplating other metals all can realize welding.
4, electrode terminal of the present invention adopts ultrasonic bonding covering cermet substrate, comparatively conventional bonding technique, welding process does not need solder, protective gas when scaling powder and welding, industrialization operation simplifies greatly, reduce product resource to drop into, improve welding efficiency, the present invention does not need to carry out high temperature sintering, spark can not be produced in welding process, storeroom does not produce high temperature, will other part material metallic characters be caused to weaken by Yin Gaowen, also avoid in conventional solder welding procedure simultaneously, solder trickles, the factors such as solder mask are to the risk of contamination of device surface, make the electrical connection area savings of weld over half, the control of solder side simplifies.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
Fig. 1 is one of structural representation of electrode terminal of the present invention.
Fig. 2 is the structural representation two of electrode terminal of the present invention.
Fig. 3 is that electrode terminal of the present invention is pressed in the structural representation covered on cermet substrate through supersonic welding.
Fig. 4 is the structural representation after electrode terminal of the present invention bends.
Wherein: 1-connecting plate, 2-riser, 3-transverse slat, 4-end tab, 5-bending notch, 6-through hole, 7-median slot, 8-side channel mouth, 9-base plate, 10-covers cermet substrate, 11 shells, 11-1-electrode tip holder.
Embodiment
See Fig. 1, shown in 2, electrode terminal of power module of the present invention, comprise bearing and the end tab 4 of one, end tab 4 is provided with through hole 6, end tab 4 is positioned at bending part and is provided with at least one notch, facilitate the bending of end tab 4, see Fig. 3, shown in 4, the bearing pressure welding of electrode terminal of the present invention is on the metal level covering cermet substrate 10, covering cermet substrate 10 is fixed on base plate 9, this base plate 9 adopts copper soleplate and is connected with radiator, heat when being worked by power model is forced to shed, the end tab 4 of electrode terminal of the present invention passes shell 11 and overlays on shell 11 top after bending, and be arranged on electrode tip holder 11-1, end tab 4 is positioned at bending part and is provided with at least one bending notch 5, as shown in Figure 1, two bending notches 5 can be adopted, under holding electrode terminal mechanical strength, be convenient to the bending of end tab 4, through hole 6 on end tab 4 is corresponding with the screwed hole on electrode tip holder 11-1, by securing member, the input side of electrode terminal is connected with direct current, by securing member, the outlet side of electrode terminal is connected with external equipment simultaneously, realize the input and output of power model.
As shown in Figure 1, bearing of the present invention comprises transverse slat 3 and is arranged on transverse slat 3 two ends and by the riser 2 of arc transition, have the connecting plate 1 of outside bending bottom riser 2, connecting plate 1 is arranged on the sidepiece of riser 2.As shown in Figure 2, bearing of the present invention comprises transverse slat 3 and is arranged on transverse slat 3 both sides and by the riser 2 of arc transition, and there is bottom riser 2 connecting plate 1 of outside bending, this connecting plate 1 is arranged on front portion or the rear portion of riser 2, realizes being connected with the metal laminate postwelding covering cermet substrate 10 by connecting plate 1.
See shown in Fig. 1 ~ 4, bottom the end tab 4 of electrode terminal of the present invention by arc transition on transverse slat 3, median slot 7 on transverse slat 3 extends to the arc transition place of transverse slat 3 and end tab 4, the top of this median slot 7 exceedes the point of contact of arc transition, and the distance between the top of median slot 7 and the point of contact of arc transition is at 2 ~ 10mm, as this distance can at 5mm or 8mm etc., and end tab 4 and the two sides at the arc transition place of transverse slat 3 have side channel mouth 8 respectively, undertaken discharging and disperseing by each arc transition place and median slot 7 and side channel mouth 8 counter stress.As shown in Figure 1, when electrode terminal bears the stress that X-direction produces, the arc transition place of transverse slat 3 and two risers 2 and the median slot 7 be arranged on transverse slat 3 and side channel mouth 8 counter stress can carry out place and discharge and disperse; And when electrode terminal bears the stress that Y-direction produces, can be undertaken discharging and disperseing by the median slot 7 on the arc transition of transverse slat 3 and end tab 4 and transverse slat 3 and two side channel mouth 8 counter stresses; When electrode terminal bears the stress of Z-direction, undertaken discharging and disperseing by the median slot 7 on arc transition place between riser 2 and transverse slat 3 and connecting plate 1 and transverse slat 3 and two side channel mouth 8 counter stresses, as shown in Figure 2, undertaken discharging and disperseing by the median slot 7 in the arc transition place of arc transition place between riser 2 and transverse slat 3 and connecting plate 1, transverse slat 3 and end tab 4 and transverse slat 3 and two side channel mouth 8 counter stresses, owing to adding the Stress Release ability of electrode terminal in multiple directions, improve electrode terminal pressure welding reliability.
As shown in Figure 3, the connecting plate 1 on bearing of the present invention by ultrasonic wire bonding on the metal level covering cermet substrate 10.When carrying out ultrasonic wire bonding, to cover on the base plate 9 of cermet substrate 10 and chips welding, base plate 9 is fixed on base, support is provided with for support electrode terminal above base, by the connecting plate 1 of electrode terminal corresponding to covering assigned address on cermet substrate 10, during ultrasonic bonding, first by the connecting plate 1 of automatic station-keeping system aligning electrodes terminal and the position of bonding head, bonding head pushes down the connecting plate 1 that electrode terminal need weld, the rhombus point on bonding head is made to push down connecting plate 1, and apply lateral ultrasonic wave, rub between the connecting plate 1 making electrode terminal and the copper metal layer covering cermet substrate 10, form close contact, rely on gravitational force between atoms, realize ultrasonic bonding, by a connecting plate 1 through ultrasonic wire bonding on the metal level covering cermet substrate 10, after completing bonding, bonding head lifts, playback, and repeat the ultrasonic wire bonding of another connecting plate 1 of electrode terminal, circulate with this.
Claims (3)
1. an electrode terminal of power module, it is characterized in that: described electrode terminal comprises 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 by the riser (2) of arc transition, and riser (2) bottom has the connecting plate (1) of outside bending, end tab (4) bottom by arc transition on transverse slat (3), median slot (7) on transverse slat (3) extends to the arc transition place of transverse slat (3) and end tab (4), the top of described median slot (7) exceedes the point of contact of arc transition, and the distance between the top of median slot (7) and the point of contact of arc transition is at 2 ~ 10mm, and end tab (4) has side channel mouth (8) respectively with the two sides at the arc transition place of transverse slat (3), described end tab (4) is positioned at bending part and is provided with at least one bending notch (5), and this bending notch (5) is arranged on the non-side portion of end tab (4) bending part.
2. electrode terminal of power module according to claim 1, is characterized in that: described connecting plate (1) is arranged on the sidepiece of riser (2) or anterior or rear portion.
3., according to the welding method of claim 1 electrode terminal of power module, it is characterized in that: the connecting plate (1) on its bearing of described electrode terminal by ultrasonic wire bonding on the metal level covering 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 |
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| 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 CN102800833A (en) | 2012-11-28 |
| CN102800833B true 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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Families Citing this family (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) |
| JP2014186803A (en) * | 2013-03-22 | 2014-10-02 | Toshiba Corp | Bus bar, electronic component and manufacturing method of electronic component |
| WO2015039771A1 (en) * | 2013-09-17 | 2015-03-26 | Abb Technology Ag | 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 |
| 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 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202796921U (en) * | 2012-08-31 | 2013-03-13 | 江苏宏微科技股份有限公司 | Power module electrode terminal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2012
- 2012-08-31 CN CN201210315095.7A patent/CN102800833B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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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| CN102800833A (en) | 2012-11-28 |
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