CN113257574B - Piercing method for core cladding lead of aluminum electrolytic capacitor - Google Patents
Piercing method for core cladding lead of aluminum electrolytic capacitor Download PDFInfo
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- CN113257574B CN113257574B CN202110597497.XA CN202110597497A CN113257574B CN 113257574 B CN113257574 B CN 113257574B CN 202110597497 A CN202110597497 A CN 202110597497A CN 113257574 B CN113257574 B CN 113257574B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/008—Terminals
Abstract
The invention discloses a pricking method of a core cladding lead of an aluminum electrolytic capacitor, which comprises the following steps: (1) welding and fusing all the anode leads on the aluminum electrolytic capacitor core package to form an anode connecting wire; (2) welding and fusing all the cathode leads on the aluminum electrolytic capacitor core package to form a cathode connecting wire; (3) and (3) matching the washer with the positive connecting wire and the negative connecting wire respectively, and pricking the washer from the positive connecting wire and the negative connecting wire respectively. The method of the invention is convenient to operate in practical application; when the lead pricking method is used for pricking holes, a plurality of pairs of leads can jointly form a large turnover whole, and turnover formed during the lead pricking can be effectively prevented from falling off, so that the failure risk of the capacitor caused by the turnover falling off is avoided; the punching method can effectively reduce the change of lead-rivet riveting contact resistance in the middle and later periods of the capacitor application, and is suitable for the aluminum electrolytic capacitor with long service life or large ripple wave application requirements.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to a punching method of a core cladding lead of an aluminum electrolytic capacitor; the method for pricking the lead of the aluminum electrolytic capacitor core package is suitable for pricking holes of a plurality of pairs of lead core packages.
Background
The production process flow of the aluminum electrolytic capacitor comprises the following steps: slitting, riveting, rolling, dipping, assembling and aging testing, wherein the assembling process comprises three links of piercing and riveting, girdling sealing and sleeving, the piercing and riveting refers to the riveting of a piercing hole of a lead and a cover plate with the lead, and the riveting quality can be said to be an important factor for determining the connection of a core cladding and a terminal cover plate in a capacitor. At present, the riveting mode of the cover plate and the lead is mainly cold-press welding, and laser welding, ultrasonic welding and the like are adopted. Cold pressure welding of aluminum refers to a method of performing solid state welding by plastically deforming aluminum and aluminum metal by means of pressure at room temperature. The lead wire piercing and the washer feeding are carried out synchronously, the lead wire can form a pattern at the inner ring of the washer while piercing the round hole, and the rivet of the cover plate is subjected to expansion deformation in a cold-pressing welding mode, so that the riveting process is completed. The lead wire is turned over in the washer inner ring during punching, so that the contact between the rivet and the washer during cold-press welding is more compact, and the contact resistance is smaller. However, the inner ring of the washer in the puncturing process can form shearing force for the burring of the punctured lead wire, the shearing force can enable the burring to accidentally drop in the forming process, the washer cooperation with different inner diameters can be adopted for a single pair of lead wires and a plurality of pairs of lead wires at present, and when the hole is punctured for double pairs of lead wires or a plurality of pairs of lead wires, the shearing force of the washer can act on the burring edge of the outermost lead wire to cause the burring to drop, even the burring can not completely drop and then drop on the upper part of the core bag when the core bag overturns, so that the upper edge of the lead wire or the core bag is ignited and punctured, and the capacitor has failure hidden trouble.
The cold-pressing welding has the characteristics of easiness in operation and maintenance, simple and easily-mastered technological process, stable welding quality and the like, but the electrolytic capacitor is subjected to self-oxidation repair in the electrifying process, and oxidizing substances in electrolyte can enter gaps of the cold-pressing welding to form aluminum oxide along with the change of the service time, so that the change of the riveting contact resistance of the lead-cover plate rivet is caused, the change is not obvious to the lead on the cover plate side, but the change is large to the lead on the core bag side, and the change is related to the contact of the lead on the core bag side and the electrolyte of the washer. The lead-cover plate rivet riveting contact resistance can generate obvious changes in the use and later period of the electrolytic capacitor, and is not beneficial to the application requirements of long service life and large ripple environment.
Disclosure of Invention
Aiming at the problems that (1) the burrs formed when the core packages of the aluminum electrolytic capacitors with the lead structure are punctured on the leads accidentally fall, and the falling burrs easily cause ignition and breakdown of aluminum foils on the upper edges of the leads and the core packages, so that the capacitors have failure hidden troubles; (2) the aluminum electrolytic capacitor is applied to the problems that the riveting contact resistance of the lead-cover plate rivet in the middle and later stages is increased, the service life is not favorable, and the application in the environment with large ripple waves is not favorable.
The invention provides a puncturing method for a core cladding lead of an aluminum electrolytic capacitor, which solves the problems by the puncturing method, (1) the problem that the turnover falls off due to the washer shearing force when the lead is punctured, thereby solving the hidden trouble of capacitor failure caused by accidental turnover falling; (2) the problem of lead wire-apron rivet riveting contact resistance grow influence long-life and the requirement of big ripple application that lead wire strip oxidation leads to in the use is solved.
The invention is realized by the following technical scheme:
a pricking method for a core package lead of an aluminum electrolytic capacitor, wherein the core package of the aluminum electrolytic capacitor is provided with at least two anode leads and at least two cathode leads, and the method is characterized by comprising the following steps: (1) welding and fusing all the anode leads on the aluminum electrolytic capacitor core package to form an anode connecting wire; (2) welding and fusing all the cathode leads on the aluminum electrolytic capacitor core package to form a cathode connecting wire; (3) and matching the washer with the positive connecting wire and the negative connecting wire respectively, and pricking the washer from the positive connecting wire and the negative connecting wire respectively.
Specifically, the method for piercing the core package lead of the aluminum electrolytic capacitor provided by the invention comprises the following steps of welding and fusing the anode lead and the cathode lead on the core package respectively before piercing the lead, so that the leads with the same polarity are welded together: firstly, all the positive leads are welded into a whole (namely, a positive connecting wire) in a welding fusion mode; and all the cathode leads are welded into a whole (namely the cathode connecting wire) in the same welding and fusing way. After forming a whole with the lead wire butt fusion on the positive pole, carry out the lead wire and sting the hole together in butt fusion department and china department, because the tip of lead wire has been welded and fused together, when consequently pricking the hole together with china department again, can form a big turn-ups whole at the china department inner circle to lead wire turn-ups drops because of the effect of shearing force when can effectively preventing to sting the hole. The punching method provided by the invention solves the problem that the turnover falls off due to the shear force of the washer when the lead is punched, namely, the failure hidden danger caused by accidental turnover falling is avoided; meanwhile, the problem that the application of long service life and large ripples is influenced by the fact that the riveting contact resistance of the lead-cover plate rivet is increased due to oxidation of the lead strip in the using process is solved. When the piercing method is not adopted and the core package of the lead is directly pierced, the outer layer lead is always turned over and falls off under the action of the shearing force of washer, and the accidental turning over and falling off of the aluminum metal lead can cause the ignition and breakdown of the lead at the upper end of the core package or the aluminum foil at the upper edge, so that the capacitor brings the hidden trouble of failure.
Further, the welding fusion in the step (1) and the step (2) adopts an ultrasonic welding mode. The invention adopts the mode of ultrasonic welding pretreatment fusion to respectively pretreat a plurality of pairs of positive and negative leads before the lead is punctured, so that all the positive leads and all the negative leads are respectively welded together; the leads are welded together in an ultrasonic welding mode, the positive lead and the negative lead are in a welded state in an ultrasonic pretreatment mode, and the positive lead and the negative lead form a turned-flower whole respectively in the inner ring of the washer during punching, so that the turned-flower can be effectively prevented from falling.
Further, the ultrasonic frequency of the ultrasonic welding is 20000-25000Hz, and the ultrasonic welding time is 400-600 ms.
Further, the step (1) is specifically as follows: all the positive leads on the aluminum electrolytic capacitor core package are lapped together in a laminating mode and are combed to be tidy; and then welding all the positive leads together by ultrasonic welding to form the positive connecting wire.
Further, the ends of all the positive electrode leads were welded together by ultrasonic welding.
Further, all the positive lead ends 10-15mm were welded together by ultrasonic welding. So that all positive lead ends 10-15mm in length are welded together, rather than all of the leads.
Further, the step (2) is specifically as follows: all the cathode leads on the aluminum electrolytic capacitor core package are lapped together in a laminating mode and are combed to be tidy; and then welding all the cathode leads together by ultrasonic welding to form the cathode connecting wire.
Further, the ends of all the negative electrode leads were welded together by ultrasonic welding.
Further, all the negative lead end portions 10 to 15mm were welded together by ultrasonic welding. So that all negative lead ends 10-15mm in length are welded together, rather than all of the leads being welded together.
Further, the core cladding in the step (1) and the step (2) is a wet core cladding, and before the welding and the fusion, the electrolytes on the positive electrode lead and the negative electrode lead are removed by using a high-pressure air gun, so that the method is suitable for the lead pricking hole of the wet core cladding.
According to the method for pricking the hole of the lead wire of the core package of the aluminum electrolytic capacitor, firstly, an ultrasonic welding pretreatment link is added before a lead pricking station, the lead wires on the core package are welded together in an ultrasonic mode (the method is suitable for pricking holes of a plurality of pairs of lead wires on the core package), the leads of the plurality of pairs of lead wires are in a fusion state in the ultrasonic pretreatment mode, and the leads form a turnover whole body in an inner ring of a washer during pricking, so that the falling of outer-layer turnover caused by the shearing force of the inner ring of the washer can be effectively prevented, and a series of potential safety hazards brought to the capacitor due to accidental turnover falling are avoided. Meanwhile, the multiple pairs of leads in the welding state solve the problem that the resistance of local lead-cover plate rivet riveting contact resistance is large due to oxidation in the use process of the capacitor.
Compared with the existing pricking mode, the method for pretreating the pricking holes of the multiple pairs of leads of the core package of the aluminum electrolytic capacitor has the following beneficial effects:
(1) the invention provides a piercing method of a lead of an aluminum electrolytic capacitor core package, which adopts a mode of ultrasonic welding pretreatment fusion to respectively perform ultrasonic welding on the end parts of a positive lead and a negative lead on the core packages of a plurality of pairs of leads of the capacitor, and the method is simpler to implement in the practical application process; when the core cladding is provided with a plurality of pairs of positive leads and negative leads, the hole pricking method can effectively prevent accidental pattern turning and falling when the leads prick holes, and avoid the hidden trouble of capacitor failure caused by pattern turning and falling.
(2) After the method for pricking the holes of the core package lead of the aluminum electrolytic capacitor is adopted, a plurality of pairs of positive leads and negative leads are respectively fused into a whole, the leads are combined with the leads more sufficiently, the change of the lead-cover rivet riveting contact resistance in the middle and later periods of the use of the capacitor can be effectively reduced, and the method is suitable for the aluminum electrolytic capacitor with long service life or large ripple wave application requirements.
(3) The method for piercing the lead of the aluminum electrolytic capacitor core package adopts an ultrasonic welding pretreatment fusion mode to pretreat the lead before piercing, respectively weld the end parts of a plurality of pairs of positive leads and negative leads on the capacitor core package together, and weld a plurality of pairs of homopolar leads together in an ultrasonic welding mode, wherein the ultrasonic pretreatment mode enables the plurality of pairs of homopolar leads to be in a welding state to respectively form a positive connecting wire and a negative connecting wire; during punching, each lead in the washer inner ring can form a turned-over whole, so that the falling of turned-over due to the shearing force of the washer inner ring can be effectively prevented.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a structural schematic of a core package in an aluminum electrolytic capacitor;
fig. 2 is a cross-sectional view of the core package after the positive lead and the negative lead are welded and fused, respectively.
In the figure: 1-3 are all positive leads, 4-6 are all negative leads, 7 core wraps, 8 positive connecting wires, 9 negative connecting wires, 10 washers and 11 flips; the lead 1-3 forms the anode of the aluminum electrolytic capacitor; the lead wires 4-6 constitute the negative electrode of the aluminum electrolytic capacitor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A method for pricking a lead of an aluminum electrolytic capacitor core package comprises the steps of preprocessing the lead before pricking by adopting an ultrasonic welding preprocessing fusion mode, and respectively welding the end parts of a plurality of pairs of positive leads and negative leads on the capacitor core package together, wherein the preprocessing method welds the plurality of pairs of leads with the same polarity together in an ultrasonic welding mode, and the ultrasonic preprocessing mode enables the leads with the same polarity to be in a fusion state to respectively form a positive connecting wire 8 and a negative connecting wire 9; during punching, all leads form a turnover whole in the inner ring of the washer, so that turnover falling can be effectively prevented; specifically, the method for pretreating the lead pricks of the multiple pairs of lead core packages of the aluminum electrolytic capacitor comprises the following steps: in the aluminum electrolytic capacitor of the embodiment, the anode of the core pack is provided with three leads, and the cathode of the core pack is also provided with three leads;
as shown in fig. 1-2, (1) all positive leads (including lead 1, lead 2 and lead 3) on the aluminum electrolytic capacitor core package are lapped together in a lamination mode with the length of 10-15mm at the end part, and are combed to be parallel and tidy; then welding all the anode lead wire ends 10-15mm together by ultrasonic welding to form a whole, namely the anode connecting wire 8; the ultrasonic frequency of the ultrasonic welding is 20000-25000Hz, and the ultrasonic welding time is 400-600 ms; (when the lead of the wet core cladding is subjected to ultrasonic welding pretreatment by the method, a high-pressure air gun is used for removing electrolyte on the lead in the step);
(2) all negative leads (including a lead 4, a lead 5 and a lead 6) on the aluminum electrolytic capacitor core package are lapped together in a length of 10-15mm at the end part in a laminating mode and are combed to be parallel and tidy; then welding all the negative lead wire ends 10-15mm together by ultrasonic welding to form a whole, namely the negative connecting wire 9; the ultrasonic frequency of the ultrasonic welding is 20000-25000Hz, and the ultrasonic welding time is 400-600 ms; (when the lead of the wet core cladding is subjected to ultrasonic welding pretreatment by the method, a high-pressure air gun is used for removing electrolyte on the lead in the step);
(3) after the positive lead and the negative lead are respectively subjected to ultrasonic welding, matching the washer 10 with the positive connecting wire 8 and the negative connecting wire 9, respectively puncturing the washer 10 from the positive connecting wire 8 and the negative connecting wire 9, wherein the welded leads can form a turnup 11 whole in each lead of the inner ring of the washer 10 during puncturing, so that the turnup can be effectively prevented from falling; the hidden trouble that the capacitor is struck by fire and broken down because of the turn-ups 11 drops is avoided, and the lead wire just, negative pole lead wire fuses into a whole respectively after above-mentioned ultrasonic welding preliminary treatment simultaneously, and the combination between lead wire and the lead wire is more abundant, prevents to take place the oxidation because of oxidizing substance gets into in the welding seam between the lead wire in the electrolyte, consequently can effectively reduce the change of electric capacity in the middle and later stage lead wire-apron rivet riveting contact resistance.
And (3) testing: taking 50 groups of the same aluminum electrolytic capacitor core package with three leads on the anode and the cathode, preprocessing the leads before punching by adopting the ultrasonic welding preprocessing fusion mode of the invention, respectively carrying out ultrasonic welding on the ends of a plurality of pairs of leads of the anode and the cathode of the capacitor core package, and then carrying out lead punching together with the washer 10 after welding the leads together, wherein a large turnup 11 whole body can be formed in the inner ring of the washer at the moment; the result shows that 50 groups have no condition that the burr hole flanging 11 falls, which shows that the burr hole flanging method can effectively prevent the falling of the flanging when the lead wire is used for punching, solves the problem that the flanging of the lead wire falls when the lead wire is used for punching, and avoids the hidden trouble of failure of the capacitor caused by the flanging and falling.
And (3) carrying out a life test 2000H on 12 aluminum electrolytic capacitor finished products punctured by adopting the mode, and respectively testing the contact resistance of the lead 1, the lead 2 and the lead 3, wherein the result shows that the contact resistance is only increased by 10-15%, the change is small, and the difference between the leads is small.
Comparative example 1
The same aluminum electrolytic capacitor as that used in the above example 1 was used, and the core package of the capacitor had three positive leads and three negative leads, and the comparative example 1 was a method in which the piercing method of the present application was not used, and the piercing was directly performed on the leads, specifically including the steps of:
(1) overlapping three positive leads (including a lead 1, a lead 2 and a lead 3) on the aluminum electrolytic capacitor core package in a laminating manner, carding and trimming, punching the three positive leads and the washer 10 together at the end part of the leads, and riveting the punched leads with the cover plate;
(2) and similarly, overlapping three leads (including the lead 4, the lead 5 and the lead 6) of the negative electrode on the aluminum electrolytic capacitor core package together in a laminating mode, carding and tidying, punching the three leads of the negative electrode and the washer 10 together at the end part of the leads, and riveting the punched leads with the cover plate.
Testing
50 groups of the same aluminum electrolytic capacitors as in example 1 (three leads for both the positive and negative electrodes) were similarly punched with the washer 10 in the manner described above in comparative example 1.
As a result, after 50 groups of pricking holes are counted, 16 groups of the holes are subjected to the condition that the flowers 11 fall (the flowers formed by the pricking holes fall, and can be visually seen by naked eyes); and 4 groups of the occasionally-falling flowers fall on the upper end of the core bag after the core bag is turned over, so that the capacitor is struck and broken down; taking 12 finished aluminum electrolytic capacitors of the comparative example 1 to carry out a life test 2000H, and respectively testing the contact resistance of the lead 1, the lead 2 and the lead 3 in the life sequence, the results show that the contact resistance is increased by 10-15%, 90-100% and 90-100%, the change is large, the contact resistance of the lead close to the cover plate side is small, and the contact resistance of the other leads is large.
The inverse example 1 illustrates the wire piercing method proposed by the present invention: (1) the probability of the turnover falling during the punching can be greatly reduced, and the failure of the capacitor caused by the turnover falling is avoided; (2) the change of the riveting contact resistance of the lead-cover plate rivet in the middle and later periods of the use of the capacitor can be effectively reduced. Therefore, the lead pricking method can avoid potential safety hazards, solve the problem of large resistance change of the lead-cover plate rivet riveting contact caused by oxidation of the lead strip in the use process, save the cost and have obvious economic benefit; meanwhile, the actual operation process of the lead pricking method is simple, and only ultrasonic welding is needed to be carried out in advance before the lead pricking, so that the end parts of a plurality of leads with the same polarity are welded together; the method for pricking the core package lead of the aluminum electrolytic capacitor is suitable for pricking holes of a plurality of pairs of leads, the plurality of pairs of leads are fused into a welding whole through ultrasonic welding pretreatment, and then are matched with the washer for pricking holes, and a large turnover whole is formed in the inner ring of the washer, so that the turnover falling during pricking holes can be effectively prevented. If a plurality of pairs of leads and washers are directly punctured, the leads are independent from each other and are not welded, so that gaps among the leads are oxidized in the long-term use process after cold-press welding; meanwhile, due to the shearing force of the washer, the outer layer lead is accidentally turned and falls, the turned flowers which do not fall completely fall on the upper portion of the core bag even when the core bag is turned over, the upper edge of the lead or the core bag is ignited and broken down, and the capacitor is made to have failure hidden trouble.
The above-mentioned preferred embodiments of the present invention are provided for illustration only and not for the purpose of limiting the invention. Obvious variations or modifications of the present invention are within the scope of the present invention.
Claims (10)
1. A pricking method for a core package lead of an aluminum electrolytic capacitor, wherein the core package of the aluminum electrolytic capacitor is provided with at least two anode leads and at least two cathode leads, and the method is characterized by comprising the following steps:
welding and fusing all the anode leads on the aluminum electrolytic capacitor core package to form an anode connecting wire;
welding and fusing all the cathode leads on the aluminum electrolytic capacitor core package to form a cathode connecting wire;
and matching the washer with the positive connecting wire and the negative connecting wire respectively, and pricking the washer from the positive connecting wire and the negative connecting wire respectively.
2. The method for piercing the core lead of the aluminum electrolytic capacitor as recited in claim 1, wherein the welding fusion in the step (1) and the step (2) is performed by ultrasonic welding.
3. The method as claimed in claim 2, wherein the ultrasonic frequency of the ultrasonic welding is 20000-25000Hz, and the ultrasonic welding time is 400-600 ms.
4. The method for piercing the core lead of the aluminum electrolytic capacitor according to claim 2, wherein the step (1) is as follows: all the positive leads on the aluminum electrolytic capacitor core package are lapped together in a laminating mode and are combed to be tidy; and then welding all the positive leads together by ultrasonic welding to form the positive connecting wire.
5. The method for piercing the core lead of the aluminum electrolytic capacitor as recited in claim 4, wherein the ends of all the positive leads are welded together by ultrasonic welding.
6. The method for pricking lead wires of the core package of the aluminum electrolytic capacitor as recited in claim 5, wherein all the positive lead wire ends are welded together by ultrasonic welding with the diameter of 10-15 mm.
7. The method for piercing the core lead of the aluminum electrolytic capacitor as recited in claim 2, wherein the step (2) is as follows: all the cathode leads on the aluminum electrolytic capacitor core package are lapped together in a laminating mode and are combed to be tidy; and then welding all the cathode leads together by ultrasonic welding to form the cathode connecting wire.
8. The method for piercing the core lead of the aluminum electrolytic capacitor as recited in claim 7, wherein the ends of all the negative leads are welded together by ultrasonic welding.
9. The method for piercing the core lead of the aluminum electrolytic capacitor as recited in claim 8, wherein all the negative lead ends are welded together by ultrasonic welding with the diameter of 10-15 mm.
10. The method as claimed in claim 1, wherein the core package in step (1) and step (2) is a wet core package, and before the welding and fusing, the electrolyte on the positive electrode lead and the negative electrode lead is removed by using a high-pressure air gun.
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| CN101714457A (en) * | 2008-10-06 | 2010-05-26 | 南通海立电子有限公司 | Aluminum electrolytic capacitor |
| CN101393799B (en) * | 2008-10-10 | 2011-03-23 | 南通天禾机械科技有限公司 | Chap preventing process for aluminum foil pre-pricking pore of aluminum electrolysis capacitor |
| CN202150359U (en) * | 2011-07-27 | 2012-02-22 | 余秀娜 | Aluminium electrolytic capacitor |
| CN105070544B (en) * | 2015-08-17 | 2018-06-19 | 南通大学 | Capacitor core packet pin acanthopore de- material component and its method of work |
| CN105489404B (en) * | 2015-12-22 | 2018-03-30 | 南通大学 | Aluminum electrolytic capacitor core bag pin spot-punching machine control system |
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| CN207731814U (en) * | 2017-12-31 | 2018-08-14 | 深圳江浩电子有限公司 | Small-sized punching aluminium electrolutic capacitor |
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