CN113517582A - Power module terminal and welding method - Google Patents
Power module terminal and welding method Download PDFInfo
- Publication number
- CN113517582A CN113517582A CN202010279162.9A CN202010279162A CN113517582A CN 113517582 A CN113517582 A CN 113517582A CN 202010279162 A CN202010279162 A CN 202010279162A CN 113517582 A CN113517582 A CN 113517582A
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- Prior art keywords
- needle
- needle cap
- welding
- power module
- hole
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 93
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 230000013011 mating Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 239000000463 material Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 229910000679 solder Inorganic materials 0.000 description 6
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005476 soldering Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- BSPSZRDIBCCYNN-UHFFFAOYSA-N phosphanylidynetin Chemical compound [Sn]#P BSPSZRDIBCCYNN-UHFFFAOYSA-N 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/02—Soldered or welded connections
- H01R4/029—Welded connections
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/10—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation
- H01R4/18—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping
- H01R4/187—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation effected solely by twisting, wrapping, bending, crimping, or other permanent deformation by crimping combined with soldering or welding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/02—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for soldered or welded connections
- H01R43/0207—Ultrasonic-, H.F.-, cold- or impact welding
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a power module terminal and a welding method, belongs to the technical field of power module manufacturing, and is used for solving the technical problems of low connection strength and low current carrying capacity of the conventional power module terminal. The invention has the advantages of simple structure, high connection strength, large production process window, high current carrying capacity, high verticality, high production efficiency and the like.
Description
Technical Field
The invention mainly relates to the technical field of power module terminal manufacturing, in particular to a power module terminal and a welding method.
Background
With the development of power semiconductors toward high frequency miniaturization, the requirement for inductance is becoming more and more strict, and therefore the power terminals and the driving terminals of the module need to be placed around the chip as much as possible to reduce parasitic inductance and reduce the module volume. The pin terminals shown in fig. 1 are widely used. The terminal is composed of a needle cap and a needle rod, the needle cap is generally designed into an I shape as shown in figure 2, and the direction is not required to be distinguished when the terminal is used; the needle bar is a quadrangular prism straight bar as shown in fig. 3, and the needle cap and the needle bar are connected stably through a needle inserting machine by means of interference fit of materials.
In use, the current process is to solder the needle cap to the backing plate with solder, which has several problems:
1. the perpendicularity of the welded needle cap cannot be guaranteed, and certain influence is caused on the subsequent needle inserting process;
2. the control requirement on the amount of the tin paste during welding is very high, and if the amount of the tin paste is too much, the tin paste can climb the tin along the inner wall of the needle cap, so that the next needle inserting process is influenced; if the solder paste is less, the strength of the needle cap after welding is not enough, and the risk of falling off of the terminal exists in practical application;
3. the current capacity is small, when the prismatic needle rod is in interference fit with the inner circular hole of the needle cap, the interference degree between the four edges of the prismatic needle rod and the material is generally 0.1mm, and local hot spots are easily generated during overcurrent; if the interference degree is larger, the force is too large when the needle is inserted, and the needle cap material is broken; if the interference degree is smaller, the formed force is smaller, and the application requirement of stable connection cannot be met.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems in the prior art, the invention provides the power module terminal which is high in through-current capacity and connection strength and ensures the perpendicularity of a pin cap and the welding method.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
the utility model provides a power module terminal, includes needle bar and needle cap, be equipped with on the needle cap be used for with needle bar interference fit's pinhole, the one end of needle cap is equipped with the turn-ups, the turn-ups be equipped with in one side of the needle cap other end be used for with ultrasonic bonding head complex fitting surface, the turn-ups opposite side then forms the face of weld.
As a further improvement of the above technical solution:
the matching surface and the needle cap are in arc transition.
The needle hole of the needle cap is a round hole, and the needle rod is a polygonal prism.
The number of the side edges of the polygonal prism is more than five.
The needle rod is a round rod, and the needle hole is a polygonal prism hole.
The number of the lateral edges of the polygonal prism hole is more than three.
The flanging is provided with more than one notch.
The invention also discloses a welding method based on the power module terminal, which comprises the following steps:
1) the ultrasonic welding head picks up the needle cap, so that the end face of the ultrasonic welding head is attached to the matching surface of the flanging of the needle cap;
2) starting ultrasonic welding, and welding the welding surface of the flanging on the welding body so as to integrate the flanging and the welding body;
3) the ultrasonic welding head releases the needle cap;
4) and inserting the needle rod into the needle hole of the needle cap to form interference fit.
As a further improvement of the above technical solution:
in the step 1), a pickup hole on the ultrasonic welding head is sleeved on the needle cap to form interference fit for pickup; and in step 3), the ultrasonic welding head is pulled out of the needle cap for release.
In step 1), picking is carried out by coating adhesive between a picking hole on the ultrasonic welding head and a needle cap, and in step 3), the ultrasonic welding head is pulled out from the needle cap for releasing.
Compared with the prior art, the invention has the advantages that:
according to the power module terminal, when welding is carried out, the matching surfaces of the ultrasonic welding head and the flanging of the needle cap are matched with each other, so that the welding surface on the other side of the flanging is subjected to ultrasonic welding with a welding body (such as a lining plate) and vibrates at high frequency along with the welding head, the welding surface of the flanging is subjected to friction with the lining plate under the pressure of the welding head, due to the friction heat, the welding surface and the lining plate are locally melted, and after solidification, interatomic connection is formed, the connection mode is different from tin paste welding, a connection interface does not exist, the connection strength is high, the reliability is high, the production process window is large, and the current carrying capacity is high; in addition, the perpendicularity of the welded needle cap can be guaranteed through the vertical precision of the ultrasonic welding head during welding, and the subsequent needle inserting process of the needle rod is facilitated.
According to the power module terminal, the pin hole is in multi-line contact with the needle rod or the polygonal pin hole is in contact fit with the cylindrical needle rod, so that the contact area is increased to ensure the through-current capacity, and meanwhile, the proper interference degree can be ensured.
The welding method is different from solder paste welding, does not have a connecting interface, and has the advantages of high connecting strength, high reliability, large production process window and large current carrying capacity; in addition, the perpendicularity of the welded needle cap can be ensured through the vertical precision of the ultrasonic welding head during welding, so that the subsequent needle inserting process of the needle rod is facilitated; moreover, the automatic welding machine can be used for full-automatic production by depending on the existing ultrasonic welding equipment with high automation degree, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic structural diagram of a pin-type structure terminal in the prior art.
Fig. 2 is a schematic structural diagram of a needle cap in the prior art.
Fig. 3 is a schematic structural view of a needle bar in the prior art.
Fig. 4 is a schematic perspective view of an embodiment of the terminal of the present invention.
Fig. 5 is a schematic front view of the terminal of the present invention.
Fig. 6 is a diagram of an embodiment of the needle cap of the present invention in a particular application.
Fig. 7 is a front view of the needle bar according to the first embodiment of the present invention.
Fig. 8 is a cross-sectional view of the needle bar according to the first embodiment of the present invention.
Fig. 9 is a second schematic front view of the needle bar of the first embodiment of the present invention.
Fig. 10 is a second cross-sectional view of the needle bar according to the first embodiment of the present invention.
Fig. 11 is a schematic perspective view of a needle cap according to a first embodiment of the present invention.
Fig. 12 is a front view of the needle cap of the present invention according to the first embodiment.
Fig. 13 is a side view of the needle cap of the present invention according to the first embodiment.
Fig. 14 is a schematic perspective view of a second embodiment of the needle cap of the present invention.
Fig. 15 is a second schematic front view of the needle cap of the first embodiment of the present invention.
Fig. 16 is a second schematic side view of the needle cap of the first embodiment of the invention.
Fig. 17 is a schematic perspective view of a needle cap according to a second embodiment of the present invention.
Fig. 18 is a schematic front view of a needle cap according to a second embodiment of the present invention.
Fig. 19 is a side view of the needle cap of the present invention in accordance with the second embodiment.
Fig. 20 is a second perspective view of the needle cap of the second embodiment of the present invention.
Fig. 21 is a second schematic front view of the needle cap of the second embodiment of the present invention.
Fig. 22 is a second schematic side view of the needle cap of the second embodiment of the invention.
The reference numbers in the figures denote: 1. a needle bar; 2. a needle cap; 201. flanging; 2011. a mating surface; 2012. welding a surface; 2013. cutting; 202. a pinhole; 3. welding a head; 301. a pick-up hole.
Detailed Description
The invention is further described below with reference to the figures and the specific embodiments of the description.
The first embodiment is as follows:
as shown in fig. 4 to 16, the power module terminal of the present embodiment includes a needle bar 1 and a needle cap 2, a needle hole 202 for interference fit with the needle bar 1 is disposed on the needle cap 2, a flange 201 is disposed at one end of the needle cap 2, a matching surface 2011 for matching with the ultrasonic welding head 3 is disposed at one side of the flange 201 at the other end of the needle cap 2, and a welding surface 2012 is formed at the other side of the flange 201. When welding, the ultrasonic welding joint 3 is matched with the matching surface 2011 of the flange 201 of the needle cap 2, so that the welding surface 2012 on the other side of the flange 201 is subjected to ultrasonic welding with a welding body (such as a lining plate) and the welding surface 2012 vibrates at high frequency along with the welding joint 3, the welding surface 2012 of the flange 201 is rubbed with the lining plate under the pressure of the welding joint 3, due to heat generated by friction, the welding surface 2012 and the lining plate are locally melted and form interatomic connection after solidification, the connection mode is different from solder paste welding, a connection interface does not exist, the connection strength is high, the reliability is high, the production process window is large, and the current carrying capacity is high; in addition, when welding, can guarantee the straightness that hangs down of needle cap 2 after the welding through the perpendicular precision of ultrasonic bonding head 3, make things convenient for the contact pin technology of follow-up needle bar 1.
As shown in fig. 6, the fitting surface 2011 of the flange 201 is in arc transition with the needle cap 2 and is matched with the inner edge fillet of the welding head 3; in addition, the distance between the edge of the flanging 201 and the needle cap 2 is at least larger than 0.2mm to ensure the welding area and the operation space of the welding head 3, the thickness of the flanging 201 is generally larger than 0.2mm to ensure the connection strength, wherein the material of the needle cap 2 needs to be consistent with the material of the lining plate to ensure that the final interatomic connection is formed, generally, the flanging is made of red copper, oxygen-free copper, beryllium copper and tin-phosphor bronze, the toughness of the materials needs to be high, and electroplating or bare copper can be used. Specifically, the bonding head 3 is cylindrical, and a pickup hole 301 (blind hole) is provided at an end thereof, and when bonding is performed, the needle cap 2 is placed in the pickup hole 301 of the bonding head 3, and the end of the bonding head 3 is pressed against a mating surface 2011 of the burring 201 of the needle cap 2, thereby ensuring reliability of bonding.
As shown in fig. 11 to 13, in the present embodiment, the needle cap 2 is T-shaped, the needle hole 202 is a circular hole, the needle bar 1 is a polygonal prism, and as shown in fig. 7 and 8, the number of the side edges of the polygonal prism is five; or, as shown in fig. 9 and 10, the number of the side edges of the polygonal prism is six. Because the needle rod 1 is in line contact with the needle hole 202, sufficient current capacity can be ensured by increasing the number of the side edges, but when the line contact between the needle rod 1 and the needle hole 202 is more, larger pressure is needed when a needle is inserted, and the needle cap 2 is broken when the interference exceeds a certain range, therefore, the number of the side edges of the polygonal prism takes the interference fit degree and the current capacity into consideration, the optimal selection is carried out, and generally 5-8 side edges are selected; of course, in other embodiments, the selection may be performed as appropriate according to the actual situation.
As shown in fig. 14 to 16, in the present embodiment, in order to reduce the stress in the process of the flange 201, the flange 201 may be cut into the notches 2013 to reduce the stress of the material. The size and the number of the cuts 2013 can be selected according to actual needs.
In addition, the needle cap 2 and the needle bar 1 may be designed as an integral structure, in addition to the above-described structure in which the needle cap 2 is separated from the needle bar 1.
The invention also discloses a welding method based on the power module terminal, which comprises the following steps:
1) the ultrasonic welding head 3 picks up the needle cap 2, so that the end face of the ultrasonic welding head 3 is attached to the matching surface 2011 of the flanging 201 of the needle cap 2;
2) starting ultrasonic welding, and welding the welding surface 2012 of the flanging 201 on the welding body, so that the flanging 201 and the welding body are integrated;
3) the ultrasonic welding joint 3 releases the needle cap 2;
4) the needle bar 1 is inserted into the needle hole 202 of the needle cap 2 to form an interference fit.
The welding method is different from solder paste welding, does not have a connecting interface, and has the advantages of high connecting strength, high reliability, large production process window and large current carrying capacity; in addition, the perpendicularity of the welded needle cap 2 can be ensured through the vertical precision of the ultrasonic welding joint 3 during welding, so that the subsequent needle inserting process of the needle rod 1 is facilitated; moreover, the automatic welding machine can be used for full-automatic production by depending on the existing ultrasonic welding equipment with high automation degree, and the production efficiency is improved.
In the embodiment, the clamping and releasing method of the needle cap 2 and the welding head 3 can be designed by utilizing the principle that the needle cap 2 is light before welding and is integrated with the lining plate after welding so as not to be easily separated, and in the step 1), the needle cap 2 is sleeved with the pick-up hole 301 on the ultrasonic welding head 3 to form interference fit for picking up; and in step 3), the ultrasonic bonding head 3 is pulled out from the needle cap 2 to be released. Specifically, during picking, the needle cap 2 and the picking hole 301 of the welding head 3 are in interference connection, and after welding, the welding head 3 is separated from the needle cap 2 because the connection strength of the needle cap 2 and the lining plate is far greater than the force caused by interference. Of course, in other embodiments, the outer wall of the needle cap 2 may be coated with a layer of adhesive, and when picking up, the adhesive adheres the soldering tip 3 to the needle cap 2, and after soldering, the soldering tip 3 is detached from the needle cap 2.
Example two:
as shown in fig. 17 to 22, the difference between the present embodiment and the first embodiment is that the shape of the needle bar 1 is different from the shape of the needle hole 202, specifically, in the present embodiment, the needle bar 1 is cylindrical, and the needle cap 2 and the needle hole 202 are polygonal prisms, and at this time, the contact area between the needle bar 1 and the needle hole 202 is increased compared with the contact area of the line contact in the first embodiment, and by controlling the interference degree, it is possible to achieve both appropriate strength and good flow capacity. As shown in fig. 17 to 19, the needle cap 2 and the needle hole 202 are both square. Alternatively, as shown in fig. 20 to 22, the needle cap 2 and the needle hole 202 are hexagonal structures. Of course, in other embodiments, a pentagonal or more structure may be selected as the actual case may be. In addition, the polygonal flanging 201 also needs the notches 2013, the design of the notches 2013 is along the diagonal direction, and the size of the opening is selected according to the actual situation. Other details are the same as those in the first embodiment and are not described herein again.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. The utility model provides a power module terminal, includes needle bar (1) and needle cap (2), its characterized in that, be equipped with on needle cap (2) be used for with needle bar (1) interference fit's pinhole (202), the one end of needle cap (2) is equipped with turn-ups (201), turn-ups (201) are equipped with in one side of needle cap (2) the other end and are used for fitting surface (2011) with ultrasonic bonding head (3) complex, the opposite side of turn-ups (201) then forms weld face (2012).
2. The power module terminal as claimed in claim 1, wherein the mating surface (2011) transitions into a circular arc with the pin cap (2).
3. The power module terminal according to claim 1, wherein the needle hole (202) of the needle cap (2) is a circular hole and the needle bar (1) is a polygonal prism.
4. The power module terminal according to claim 3, wherein the number of side edges of the polygonal prism is five or more.
5. The power module terminal according to claim 1, wherein the needle bar (1) is a round bar and the needle hole (202) is a polygonal prism hole.
6. The power module terminal as claimed in claim 5, wherein the number of the side edges of the polygonal prism hole is three or more.
7. The power module terminal as claimed in any one of claims 1 to 6, wherein the flange (201) is provided with more than one notch (2013).
8. A welding method based on the power module terminal of any one of claims 1 to 7, characterized by comprising the steps of:
1) the ultrasonic welding head (3) picks up the needle cap (2) to enable the end face of the ultrasonic welding head (3) to be attached to the matching face (2011) of the flanging (201) of the needle cap (2);
2) starting ultrasonic welding, and welding the welding surface (2012) of the flanging (201) on the welding body to integrate the flanging (201) and the welding body;
3) the ultrasonic welding head (3) releases the needle cap (2);
4) the needle rod (1) is inserted into the needle hole (202) of the needle cap (2) to form interference fit.
9. Welding method according to claim 8, characterized in that in step 1) the needle cap (2) is fitted over by means of a pick-up hole (301) in the ultrasonic welding head (3) forming an interference fit for picking up; and in step 3), the ultrasonic welding head (3) is pulled out from the needle cap (2) for release.
10. Welding method according to claim 8, characterized in that in step 1) the pick-up is performed by applying an adhesive body between the pick-up hole (301) on the sonotrode (3) and the needle cap (2), and in step 3) the sonotrode (3) is pulled out of the needle cap (2) for release.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010279162.9A CN113517582A (en) | 2020-04-10 | 2020-04-10 | Power module terminal and welding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010279162.9A CN113517582A (en) | 2020-04-10 | 2020-04-10 | Power module terminal and welding method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113517582A true CN113517582A (en) | 2021-10-19 |
Family
ID=78060539
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010279162.9A Pending CN113517582A (en) | 2020-04-10 | 2020-04-10 | Power module terminal and welding method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113517582A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207165552U (en) * | 2017-09-06 | 2018-03-30 | 扬州国扬电子有限公司 | A kind of plug-in terminal of power model |
| CN209804600U (en) * | 2019-02-28 | 2019-12-17 | 株洲中车时代电气股份有限公司 | Welding base for power module |
-
2020
- 2020-04-10 CN CN202010279162.9A patent/CN113517582A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN207165552U (en) * | 2017-09-06 | 2018-03-30 | 扬州国扬电子有限公司 | A kind of plug-in terminal of power model |
| CN209804600U (en) * | 2019-02-28 | 2019-12-17 | 株洲中车时代电气股份有限公司 | Welding base for power module |
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Application publication date: 20211019 |