CN215988448U - Stacked aluminum electrolytic capacitor - Google Patents
Stacked aluminum electrolytic capacitor Download PDFInfo
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- CN215988448U CN215988448U CN202121419462.9U CN202121419462U CN215988448U CN 215988448 U CN215988448 U CN 215988448U CN 202121419462 U CN202121419462 U CN 202121419462U CN 215988448 U CN215988448 U CN 215988448U
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Abstract
The utility model provides a stacked aluminum electrolytic capacitor, which comprises a lead frame with a positive electrode end and a negative electrode end, a capacitor unit assembly and at least one laser welding area. The capacitor unit assembly includes a plurality of stacked capacitor elements, each having a positive portion electrically connected to the positive terminal of the lead frame and a negative portion electrically connected to the negative terminal of the lead frame. The at least one laser welding area is formed by performing laser welding on the positive end of the lead frame and the positive end of each stacked capacitor element by a laser source capable of emitting laser beams and performing fusion connection, so that the positive end of each stacked capacitor element and the positive end of the lead frame are welded without thermal destruction effect, and the stacked capacitor element has the advantages of low impedance, strong tensile force, vibration resistance, high consistency and quick operation.
Description
Technical Field
The present invention relates to a stacked aluminum electrolytic capacitor, and more particularly, to a stacked aluminum electrolytic capacitor that is suitable for use in automotive products and is resistant to high humidity and vibration.
Background
The capacitor is the most widely used electronic passive element at present, and is applied to the fields of general consumer electronics, tablet computers, smart phones, household electronic equipment and the like. The shape and structure of capacitors vary from type to type, and most capacitors have two metal plates or electrical conductors on the metal surfaces and separated by a dielectric. The electrical conductor can be a metal foil, a film, a sintered metal, or an electrolyte. The dielectric without conductivity can improve the electricity storage capacity of the capacitor.
Please refer to taiwan patent No. I292164, "stacked solid electrolytic capacitor and manufacturing method thereof", which discloses a conventional solid aluminum electrolytic capacitor having a plurality of sequentially stacked capacitor elements. Each unit of capacitor element comprises a positive terminal and a negative terminal, all the negative terminals are positioned on the same side and electrically connected by conductive adhesive, and all the positive terminals positioned on the same side are electrically connected by resistance welding.
However, the resistance welding needs to be pressed by high-pressure external force during welding, which has high destructiveness to the product and affects the electrical property, and the volume of the positive terminal is reduced due to the metal fusion bonding after welding, so that the volume change of the positive terminal is large, which is not beneficial to the welding of multi-layer products.
Therefore, the process of connecting the positive terminal by laser filler welding instead of resistance welding is carried out by firstly carrying out fusing vaporization on the positive terminal by a laser source to generate a pore channel, then placing the metal solder into the pore channel, and then melting the metal solder to enable each layer of material of the positive terminal to be jointed for electrical connection.
In order to overcome the disadvantages of laser filler welding, taiwan patent certificate number I691982, "stacked solid electrolytic capacitor packaging structure and manufacturing method thereof" patent proposes a filler-free laser welding method, wherein laser with a laser beam diameter less than 100 μm is used for welding the positive electrode, and each positive electrode end and conductive terminal are pierced through, so that a welding structure substantially free of cavitation erosion can be formed in the process, and therefore, a filler metal is not required to be used for joining the positive electrode ends.
However, such a welding method has other problems, such as a relatively narrow welding pass due to a small diameter of the laser beam, a high aspect ratio after fusion welding, and a high impedance. In order to reduce the impedance of the capacitor, multiple welding patterns such as a spiral welding pattern, a concentric circle welding pattern or a concentric rectangle welding pattern are required to be used for welding so as to improve the conductive quality. The narrow welding bead also has the strength problem, and the terminal needs certain intensity after being connected with the welded positive terminal, just can avoid the bad emergence of splitting, so need weld with welding appearance such as multichannel, spiral, concentric circle or concentric rectangle and promote welding strength equally, otherwise shock resistance can be not enough. However, multiple passes of soldering make the process more difficult to control the quality of the soldering.
In addition, the conventional electrolytic capacitor is easy to have excessive capacitance attenuation caused by moisture entering the capacitor under high humidity and vehicle environment.
SUMMERY OF THE UTILITY MODEL
The utility model mainly provides a stacked aluminum electrolytic capacitor which can maintain low impedance and high strength of a positive terminal on the premise of reducing the number of welding tracks.
The utility model provides a stacked aluminum electrolytic capacitor, which comprises a lead frame, a capacitor unit assembly and at least one laser welding area. The lead frame comprises a positive terminal and a negative terminal which are spaced apart. The capacitor unit assembly includes a plurality of stacked capacitor elements each having a positive portion electrically connected to a positive terminal and a negative portion electrically connected to a negative terminal. The laser welding area is formed by welding the positive terminal of the lead frame and the positive part of each stacked capacitor element by laser welding and fusing them by a laser source capable of emitting a laser beam.
In an embodiment of the present invention, the laser source uses a continuous wave laser or a pulsed laser.
In an embodiment of the utility model, the diameter of the laser beam is between 0.05 mm and 0.2 mm, the laser energy is between 0.1 joule and 2 joules, and the instantaneous output power is between 500 watts and 2000 watts.
In an embodiment of the present invention, the laser source is a single laser source and is configured to perform a single laser welding on the positive terminal of the lead frame and the positive electrode portion of each stacked capacitor element, and a welding point diameter of the laser beam is between 0.25 mm and 0.4 mm.
In an embodiment of the utility model, the laser welding profile is cylindrical or conical.
In an embodiment of the present invention, the positive terminal of the lead frame has a first outer peripheral edge, the positive portion of each stacked capacitor element has a second outer peripheral edge, and the laser welding areas are formed at the first outer peripheral edge and the second outer peripheral edge.
In an embodiment of the utility model, the first outer peripheral edge has at least one first end surface and at least one first side surface perpendicular to the first end surface. The second outer periphery has at least one second end face corresponding to the first end face and at least one second side face corresponding to the first side face.
In an embodiment of the present invention, the laser welding area is formed on the first end surface and the second end surface.
In an embodiment of the present invention, the laser welding is continuously performed in a manner of forming a spot moving trajectory or forming a plane in a line moving trajectory to form a laser welding area, and a width of the moving trajectory is 1 cm.
In another embodiment of the present invention, the laser welding regions are formed on the first side surface and the second side surface.
In another embodiment of the present invention, in one embodiment of the present invention, the laser welding is continuously performed in a manner of dot movement trajectory being aligned or line movement trajectory being aligned to form a laser welding area, and the width of the movement trajectory is 1 cm.
In one embodiment of the present invention, a seam is formed between the first outer periphery and the second outer periphery, and the seam is dip coated with a fluorine moisture barrier agent at least three times.
In an embodiment of the present invention, the stacked aluminum electrolytic capacitor is applied to a capacitor for a vehicle.
Based on the above, the stacked aluminum electrolytic capacitor provided by the utility model is formed by arranging the laser welding zone and performing laser welding on the positive terminal of the lead frame and the positive part of each stacked capacitor element by using a laser source capable of emitting a laser beam to perform fusion connection, wherein the shape of the laser welding is designed to be cylindrical or conical, so that the number of welding tracks of the stacked aluminum electrolytic capacitor provided by the utility model can be effectively reduced and the strength of the stacked aluminum electrolytic capacitor after welding of the positive terminal can be improved under the condition of maintaining low impedance.
In order to make the aforementioned and other features and advantages of the utility model more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic perspective view of a stacked aluminum electrolytic capacitor according to a first embodiment of the present invention, showing that a laser welding area is not formed on a positive electrode terminal of a lead frame and a positive electrode portion of each stacked capacitor element.
Fig. 2 is an external view of a lead frame of the stacked aluminum electrolytic capacitor shown in fig. 1.
Fig. 3 is a schematic cross-sectional view of a stacked capacitor element of the stacked aluminum electrolytic capacitor shown in fig. 1.
Fig. 4 is a schematic perspective view of the stacked aluminum electrolytic capacitor shown in fig. 1, showing that a laser welding zone is formed at the positive terminal of the lead frame and the positive electrode portion of each stacked capacitor element.
Fig. 5 is a schematic perspective view of a stacked aluminum electrolytic capacitor according to a second embodiment of the present invention.
Fig. 6 is a schematic perspective external view of a stacked aluminum electrolytic capacitor according to a third embodiment of the present invention.
Fig. 7 is a schematic perspective view of a stacked aluminum electrolytic capacitor according to a fourth embodiment of the present invention.
Description of reference numerals: 1-lead frame, 11-positive terminal, 111-first outer peripheral edge, 1111-first end face, 1112-first side face, 12-negative terminal, 2-capacitor unit assembly, 21-stacked capacitor element, 211-positive terminal, 212-negative terminal, 213-second outer peripheral edge, 2131-second end face, 2132-second side face, 214-joint, 3a, 3b, 3 c-laser welding area, W-width.
Detailed Description
The technology, means and efficacy of the present invention are described in detail with reference to the drawings, which are for illustrative purposes only, and the present invention is not limited to the structure.
Referring to fig. 1 and fig. 4, an appearance schematic view and a cross-sectional schematic view of a stacked aluminum electrolytic capacitor according to a first embodiment of the present invention are shown. The stacked aluminum electrolytic capacitor of the present embodiment includes a lead frame 1, a capacitor unit assembly 2 and at least one laser welding area 3.
The lead frame 1 includes a positive terminal 11 and a negative terminal 12 spaced apart from each other. The positive terminal 11 of the lead frame 1 has a first outer peripheral edge 111, and the first outer peripheral edge 111 has at least a first end 1111 and at least a first side 1112 perpendicular to the first end 1111. The positive terminal 11 of the present embodiment may have two first end surfaces 1111 and two first side surfaces 1112 connected to the two first end surfaces 1111, respectively.
The capacitor unit assembly 2 includes a plurality of stacked capacitor elements 21 each having a positive portion 211 electrically connected to the positive terminal 11 of the lead frame 1 and a negative portion 212 electrically connected to the negative terminal 12 of the lead frame 1. The positive electrode portion 211 of each stacked capacitor element 21 has a second peripheral edge 213, and the second peripheral edge 213 has at least one second end 2131 corresponding to the first end 1111 and at least one second side 2132 corresponding to the first side 1112. The positive electrode portion 211 of the present embodiment may have two second end surfaces 2131 and two second side surfaces 2132 connected to the two second end surfaces 2131, respectively. As shown in fig. 1, when a plurality of stacked capacitor elements 21 are stacked on the positive electrode terminal 11 of the lead frame 1, the first end surface 1111 of the positive electrode terminal 11 can be coplanar with the second end surface 2131 of each positive electrode portion 211, and the first side surface 1112 can be coplanar with the second side surface 2132 of each positive electrode portion 211.
Referring to fig. 4, the laser land 3 is formed by laser welding the positive electrode terminal 11 of the lead frame 1 and the positive electrode portion 211 of each stacked capacitor element 21 by a laser source capable of emitting a laser beam and fusion-connecting them. Further, laser welded lands 3 are formed on first outer peripheral edge 111 of positive electrode terminal 11 and second outer peripheral edge 213 of each positive electrode portion 211. In addition, the number of the laser lands 3 of the present embodiment is two, and the laser lands are formed on the first end surface 1111 and the second end surface 2131 and each have a width W.
The laser source can be continuous wave laser or pulse laser, the diameter of the laser beam can be between 0.05 mm and 0.2 mm, the laser energy can be between 0.1 joule and 2 joules, and the instantaneous output power can be between 500 watts and 2000 watts. The laser light source used in the present embodiment can be a single laser light source and configured to perform a single laser welding on the positive terminal 11 of the lead frame 1 and the positive electrode portion 211 of each stacked capacitor element 21, and the spot diameter of the laser beam can be between 0.25 mm and 0.4 mm.
Further, the laser welding profile may be cylindrical or conical, and may be continuously performed in a manner of forming a spot moving trajectory or forming a line moving trajectory in a planar manner to form the laser welding zone 3, and the width of the moving trajectory is 1 cm.
The above-described laser welding forming the laser welded zone 3 has advantages in that:
1. the heat absorbed by the positive terminal 11 and the positive part 211 is reduced to the minimum, the metallographic change range of a heat affected zone is small, and the deformation caused by heat conduction can also be minimized;
2. the depth-to-width ratio of a welding bead of the laser deep melting type welding can reach 10: 1;
3. the range of weldable material types is large, various heterogeneous materials can be mutually jointed, and the welding effect is good.
In addition, a joint 214 is formed between the first outer peripheral edge 111 and the second outer peripheral edge 213, and the joint 214 is dip-coated with a fluorine moisture-proof agent for at least three times, wherein the fluorine moisture-proof agent can be SFE-X14H or FE-DO2HL (manufactured by AGC SEIMI CHEMICAL Co., LTD.), and the fluorine moisture-proof agent can effectively block moisture from entering and reduce the capacity change rate.
Fig. 5 is an appearance schematic diagram of a stacked aluminum electrolytic capacitor according to a second embodiment of the present invention, the structure of the stacked aluminum electrolytic capacitor of the present embodiment is substantially the same as that of the first embodiment, and the difference can be seen from the following description when viewed together with fig. 4: the width W of the laser welded zone 3a of the present embodiment is larger than the width W of the laser welded zone 3 of the first embodiment, that is, laser welding is continuously performed in a line-moving trajectory in a planar manner to form the laser welded zone 3 a.
Fig. 6 is an appearance schematic diagram of a stacked aluminum electrolytic capacitor according to a third embodiment of the present invention, and the structure of the stacked aluminum electrolytic capacitor of the present embodiment is substantially the same as that of the first embodiment, except that: the laser lands 3b are formed on the first side surface 1112 and the second side surface 2132.
Fig. 7 is an appearance schematic diagram of a stacked aluminum electrolytic capacitor according to a fourth embodiment of the present invention, the structure of the stacked aluminum electrolytic capacitor of the present embodiment is substantially the same as the third embodiment, and the difference can be seen from the following description with reference to fig. 6: the width W of the laser welded zone 3c of the present embodiment is larger than the width W of the laser welded zone 3b of the third embodiment, that is, laser welding is continuously performed in a line-moving trajectory in a planar manner to form the laser welded zone 3 c.
In summary, the stacked aluminum electrolytic capacitor of the present invention is formed by arranging the laser welding zones 3, 3a, 3b, 3c to be welded and fused by a laser source capable of emitting a laser beam to the positive terminal 11 of the lead frame 1 and the positive part 211 of each stacked capacitor element 21, and the shape of the laser welding is designed to be cylindrical or conical, so that the stacked aluminum electrolytic capacitor of the present invention can effectively reduce the number of welding tracks and improve the strength and tensile strength after welding the positive terminal 11 and the positive part 211 while maintaining low impedance. In addition, in the vehicle standard vibration resistance test which reaches 5G, the aluminum electrolytic capacitor subjected to laser welding has higher passing rate, and the leakage current change and the impedance change range after the test are both better than those of the resistance-type welded capacitor.
Claims (10)
1. A stacked aluminum electrolytic capacitor, comprising:
the lead frame comprises a positive terminal and a negative terminal which are spaced from each other;
a capacitor unit assembly including a plurality of stacked capacitor elements, wherein each of the plurality of stacked capacitor elements has a positive electrode portion electrically connected to the positive terminal and a negative electrode portion electrically connected to the negative terminal; and
at least one laser welding area, which is formed by laser welding and fusing the positive electrode end of the lead frame and the positive electrode part of each stacked capacitor element by a laser source capable of emitting laser beams.
2. The stacked aluminum electrolytic capacitor of claim 1, wherein: the laser source adopts continuous wave laser or pulse laser.
3. The stacked aluminum electrolytic capacitor of claim 1, wherein: the diameter of the laser beam is between 0.05 and 0.2 mm, the laser energy is between 0.1 and 2 joules, and the instantaneous output power is between 500 and 2000 watts.
4. The stacked aluminum electrolytic capacitor of claim 1, wherein: the laser source is a single laser source and is configured to perform a single laser welding on the positive terminal of the lead frame and the positive electrode portion of each stacked capacitor element, and a spot diameter of the laser beam is between 0.25 mm and 0.4 mm.
5. The stacked aluminum electrolytic capacitor of claim 1, wherein: the laser weld profile is cylindrical or conical.
6. The stacked aluminum electrolytic capacitor of claim 1, wherein: the positive terminal of the lead frame has a first outer periphery, the positive part of each stacked capacitor element has a second outer periphery, the at least one laser welding area is formed on the first outer periphery and the second outer periphery, the first outer periphery has at least one first end face and at least one first side face perpendicular to the at least one first end face, and the second outer periphery has at least one second end face corresponding to the at least one first end face and at least one second side face corresponding to the at least one first side face.
7. The stacked aluminum electrolytic capacitor of claim 6 wherein: the at least one laser welding area is formed on the at least one first end face and the at least one second end face, the laser welding is continuously carried out in a point moving track forming mode or a line moving track forming mode to form the at least one laser welding area, and the width of the moving track is 1 cm.
8. The stacked aluminum electrolytic capacitor of claim 6 wherein: the at least one laser welding area is formed on the at least one first side surface and the at least one second side surface, the laser welding is continuously carried out in a point moving track forming mode or a line moving track forming mode to form the at least one laser welding area, and the width of the moving track is 1 cm.
9. The stacked aluminum electrolytic capacitor of claim 6 wherein: a joint is formed between the first outer periphery and the second outer periphery, and the joint is dipped and coated with fluorine moisture-proof agent for at least three times.
10. The stacked aluminum electrolytic capacitor as recited in any one of claims 1 to 9, characterized in that: which is a capacitor for a vehicle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121419462.9U CN215988448U (en) | 2021-06-24 | 2021-06-24 | Stacked aluminum electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121419462.9U CN215988448U (en) | 2021-06-24 | 2021-06-24 | Stacked aluminum electrolytic capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215988448U true CN215988448U (en) | 2022-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121419462.9U Active CN215988448U (en) | 2021-06-24 | 2021-06-24 | Stacked aluminum electrolytic capacitor |
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|---|---|
| CN (1) | CN215988448U (en) |
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2021
- 2021-06-24 CN CN202121419462.9U patent/CN215988448U/en active Active
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