CN100428380C - Method for mfg. electrolytic capacitor - Google Patents
Method for mfg. electrolytic capacitor Download PDFInfo
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- CN100428380C CN100428380C CNB021598169A CN02159816A CN100428380C CN 100428380 C CN100428380 C CN 100428380C CN B021598169 A CNB021598169 A CN B021598169A CN 02159816 A CN02159816 A CN 02159816A CN 100428380 C CN100428380 C CN 100428380C
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Abstract
By connecting lead wires severally to the anode foil and the cathode foil, coiling the anode foil and the cathode foil after arranging a separator between them to form the capacitor element, applying direct voltage between the lead wires of the capacitor element and checking the dielectric strength between the anode foil and the cathode foil to sort good and defective elements, immersing the sorted capacitor element in an electrolytic solution for drive, inserting the capacitor element into a metal case, and sealing the opening of the metal case by a sealing material, an electrolytic capacitor is obtained. The electrolytic capacitors manufactured by the method can secure the insulating voltage between anode foil and cathode foil, thus a highly reliable electrolytic capacitor that not have large inrush currents is obtained.
Description
Technical field
The present invention relates to the manufacture method of the electrolytic capacitor that on various electronic equipments, uses.
Background technology
In recent years along with electronic equipment enters miniaturization, electrolytic capacitor is obviously miniaturization also, and along with the converterization of the digitlization of electronic equipment and fluorescent lamp etc., and wish that the pulsation absorption characteristic of high frequency is good, and the little low-impedance electrolytic capacitor of internal resistance.
Figure 4 illustrates electrolytic capacitor of the prior art.Electrolytic capacitor element 47 comprises: be connected with anode-side lead-in wire 41 anode foils, be connected with cathode side lead-in wire 43 Cathode Foil 44, be clipped in the spacer 45,46 between Cathode Foil 44 and the anode foils 42; They are wound up.Capacitor element 47 is accommodated in the metal shell (not shown) after soaking and containing driving electrolytic solution.Seal the peristome of metal shell then with closure member, just make electrolytic capacitor.
For this capacitor is diminished, and the sheet capacitance of the per unit area of anode foils 42 and Cathode Foil 44 is improved, and the opposed area of anode foils and Cathode Foil 44 is diminished and the number of times of the volume of capacitor element 47 is tailed off.
If the opposed area across spacer 45,46 opposed anode foils and Cathode Foil 44 becomes 1/2, then the internal resistance of electrolytic capacitor becomes 2 times, if the distance between them becomes 1/2, then internal resistance becomes 1/2.Because this distance is only determined by the thickness of spacer 45,46, so for electrolytic capacitor is diminished, thickness, the density of spacer 45,46 are important.
With in the electrolytic capacitor of capacitor element 47, for the thickness attenuation that makes spacer 45,46 or when its density is reduced, anode foils 42 and Cathode Foil 44 are short-circuited easily, and it is big that leakage current and tan σ become.
As shown in the sectional drawing of the capacitor element 47 of Fig. 5 like that, anode foils 42 and Cathode Foil 44 have the projection 48,49 when cutting off respectively on the width of regulation.Because projection 48,49 makes leakage current and tan σ become big along with spacer 45,46 attenuation.
After operation that the capacitor element 47 with projection 48,49 is reeled, measure the contact resistance between anode-side lead-in wire 41 and the cathode side lead-in wire 43, have or not short circuit so that differentiate.Under the occasion that the anode foils 42 and the interelectrode distance of Cathode Foil 44 can not fully be guaranteed,, can not detect as short circuit is defective as long as do not have in the contact between electrode.The result makes in the electrolytic capacitor after inspection and also comprises leakage current and the big capacitor of tan σ.
In addition, with regard to the electrolytic capacitor that AC100V, 200V, 220V use in the power circuit of the power circuit of the electronic products of work and personal computer etc. and communication apparatus down, flow through starting current when existence drops into along with power supply in these power circuits, and capacitor causes the situation that insurance is cut off because of instantaneous short-circuit.
In case in electrolytic capacitor, flow through starting current, just supplied with a large amount of electronics, the instantaneous rising of voltage between anode foils 42 and the Cathode Foil 44 in the 44 last short time of Cathode Foil., resistance is big because electrolyte is compared with Cathode Foil 44, so the inflow of electronics is slow.In case on anode foils 42 and Cathode Foil 44, exist because of recess and metal dust etc. approaching near portion, electronics with regard to moment concentrate on the front end near portion.So because of the electric potential gradient of this part changes, and generation makes the electrochemical capacitor short circuit by the insulation breakdown that electron avalanche causes.
Summary of the invention
Lead-in wire is connected on anode foils and the Cathode Foil.By making spacer be clipped in the formation capacitor element of reeling between anode foils and the Cathode Foil.Sub-elect between lead-in wire and apply the capacity cell that the direct voltage after-current does not pass through, electrolyte is soaked be contained on the capacitor element that sub-elects, will soak the capacitor element that contains electrolyte then and insert in the housing, just make electrolytic capacitor.
The dielectric voltage withstand of anode foils and Cathode Foil can be guaranteed by the capacitor element that this method makes, thereby the big and high electrolytic capacitor of reliability of anti-starting current can be obtained.
Description of drawings
Fig. 1 is the flow chart of manufacturing process of the electrolytic capacitor of embodiment of the present invention.
Fig. 2 represents the thickness of spacer of electrolytic capacitor of present embodiment and the relation of dielectric voltage withstand
Fig. 3 is the dielectric voltage withstand manipulated or operated apparatus of the dielectric voltage withstand of capacitor of the electrolytic capacitor of embodiment of the present invention when checking.
Fig. 4 is the open cube display of capacitor element of the electrolytic capacitor of prior art.
Fig. 5 is the profile of capacitor element of the electrolytic capacitor of prior art.
Embodiment
Fig. 1 is the flow chart of manufacturing process of the electrolytic capacitor of embodiments of the present invention.
At first carry out corrosion treatment, will be connected to as the lead-in wire 13 of external connection terminals on the long-pending Cathode Foil 12 of enlarged surface after anode foils 11 through forming dielectric oxide film after the corrosion treatment and the corrosion treatment by rivet clasp operation 14 then.
Anode foils 11 and Cathode Foil 12 are clipped by paper or the fibrous porousness spacer 15 of macromolecular material, and reeling by coiling operation 16 just obtains capacitor element.
Then between each lead-in wire 13 of this capacitor element, apply direct voltage and check 17 process inspection dielectric voltage withstand, in this is checked, between lead-in wire, apply the direct voltage of 600～1200V, get rid of the capacitor element that has discharged by dielectric voltage withstand.
If anode foils 11 is identical with the thickness of spacer 15 with the electrode spacing distance of Cathode Foil 12, then under dielectric voltage withstand, do not discharge corresponding to this thickness.Yet during shortening the voltage that is then reaching 1200V, interelectrode distance discharges at the capacitor element shown in Fig. 5.Therefore preestablish the direct voltage of allowed band, get rid of underproof capacitor element by applying this voltage.
In addition, direct voltage is determined by the proof voltage of the dielectric film of anode foils and the thickness and the density of spacer.Because spacer is thick more and density is high more, dielectric voltage withstand is also high more, so the also essential height of setting of direct voltage.
Yet,, cause the insulation breakdown of the anode foils and the Cathode Foil of capacitor element easily, because above-mentioned inspection becomes the capacitor element destructive inspection, so be worthless if apply direct voltage above 1200V.
In addition, if the moisture content of spacer crosses 7%, then descend, and can not check true dielectric voltage withstand, so neither be desirable because of moisture makes dielectric voltage withstand.
Then make the capacitor element that sub-elects through soak contain soaking of electrolyte 18 and contain operation 19 after, be inserted in the metal shell 20 of bottom tube-like.Seal the peristome of metal shell 20 with closure member 21 with the fairlead of drawing lead-in wire 13.Utilize the assembling procedure that compresses the periphery of closure member 21 by peristome that capacitor element is encapsulated in the metal shell 20 again with metal shell 20.
Recover the formation operation again 23 of dielectric oxide film then by the voltage that applies regulation, carry out the inspection operation 24 of characteristics such as capacitance, leakage current, tan σ at last, just obtain electrolytic capacitor.
Make fully anti-instantaneous peak current of electrolytic capacitor like this,, also can provide reliability high product in the power circuit of communication apparatus even be used in electronic products and personal computer.
Fig. 2 represents the thickness of spacer of capacitor element and the relation of dielectric voltage withstand.Spacer is thick more and density is high more, and dielectric voltage withstand is just high more, and the density of spacer is low more, and dielectric voltage withstand is also low more.
As the density 1.0g/cm of spacer is for example arranged
3The time spacer thickness be 30～80 μ m, do not discharge even then apply direct voltage 1200V yet.Density at spacer is 0.6g/cm
3The time, high especially even spacer thickening dielectric voltage withstand can not become yet, if but thickness is 20～80 μ m, even then apply the 600V direct voltage, capacitor does not discharge yet.
Therefore, preferably according to the voltage that applies of the density of capacitor element or thickness setting the best.Can check the dielectric voltage withstand of capacitor element by the direct voltage that applies 600～1200V.
In addition, make capacitor, illustrated in the table 1 and in these electrolytic capacitors, flow through the short circuit disqualification rate of moment during surge current with the capacitor element of spacer with various density.
In addition, just to tool density 1.0g/cm
3Capacitor element, density 0.8g/cm with the spacer of thickness 50 μ m
3With the capacitor of the spacer of thickness 50 μ m and have density 0.6g/cm
3Estimate with 100 in the capacitor of the prior art that does not contact by the contact resistance inspection with 100 in the capacitor of not discharge after the dielectric voltage withstand performance of the capacitor element of the spacer of thickness 50 μ m is checked.
Table 1
* 1: discharge in the dielectric voltage withstand inspection, do not make capacity cell.
As can be seen from Table 1, in the electrolytic capacitor of present embodiment, the direct voltage of dielectric voltage withstand inspection be the electrolytic capacitor of 400V when flowing through instantaneous peak current disqualification rate be 2～3%, but disqualification rate was 0% when direct voltage 660V was above, in addition, because the density of spacer is 0.6g/cm
3Capacitor.The dielectric voltage withstand of element is not enough 1000V, thus when becoming 1000V, the direct voltage that makes the dielectric voltage withstand inspection just discharges when above, so can not estimate.
In contrast, do not become in the step of capacity cell by the electrolytic capacitor that connects resistance resistance inspection underproof, but the short circuit disqualification rate height that causes by starting current.
From Fig. 2 and table 1 as can be seen, by the density along with spacer, thickness changes the direct voltage that applies and carries out dielectric voltage withstand and detect, and can obtain the electrolytic capacitor of instantaneous peak current of ability.
The circuit diagram of the dielectric voltage withstand testing fixture when Fig. 3 shows the dielectric voltage withstand that carries out present embodiment.Testing fixture comprises the electric current brownout resistance R1 that is set in the power supply PW that checks on the voltage Vpw, satisfies Vpw/R1＜0.03 scope for the electric current that makes power supply PW becomes below the 30mA, the inspection voltage electricity consumption container C 1 by resistance R 1 and power supply and downlink connection, utilizes the control device switch to make capacitor element C and the testing fixture connection terminals T1 that checks dielectric voltage withstand from the switch element Tr1 of the electric current of capacitor, by switch element Tr1.
In addition, why electric current being limited in below the 30mA is because fail safe.Even in the occasion of dielectric voltage withstand more than 500V, also can measure correct dielectric voltage withstand by the circuit of above-mentioned formation.
In addition, consider that from preventing the electric shock aspect capacitance of capacitor C 1 is preferably in below the 0.4 μ F, preferably have more than 50 times of capacitance of the capacitor C2 that measures dielectric voltage withstand.This be for the variation in voltage after charging from capacitor C1 to capacitor C2 is finished little.
Resistance R 2 is the series resistances that are used for amperometric determination, is preferably in below 100 Ω, and resistance is few more, and the charging from capacitor C1 to capacity cell C2 is fast more.Can measure the electric current that flows through capacitor element C2 by measuring series resistance R2 both end voltage.
In addition, also can replace the mensuration electric current of series resistance R2, at this moment can make and charge quickly to capacity cell C2 from capacitor C1 with coil or current probe etc.
The following describes the dielectric voltage withstand checks sequence.At first charge by 1 couple of capacitor C1 of resistance R from power supply PW.The electric leakage of capacitor element C2 then makes switch element Tr1 conducting, the electric charge of capacitor C1 is charged on the capacitor element C2 quickly, even greatly also can make it rise to the voltage of regulation quickly.Under this state, when capacitor element C2 discharges,, discharging current produces potential difference because of flowing through on the two ends of series resistance R under low-voltage, be the insulation defective item thereby can detect element C2.
Minute is short more in this is checked, fail safe is high more, and long more accuracy of detection is high more, if but in the scope of 10～200ms, then can carry out safety and the high insulation inspection of precision.
In addition, before dielectric voltage withstand is checked, by with capacitor element C2 under the temperature more than 100 ℃ the dry moisture content that makes spacer below 7%, so that carry out more stable dielectric voltage withstand inspection.Spacer is dry more than 3 minutes under 1050 ℃, can make its moisture content below 7%
In addition, the mixture of used for electrolyte ethylene two pure and mild γ-butylene lactones of Fig. 1 etc. etc. use the solid electrolyte of electroconductive polymer to make solute as solvent.
The material of at least a composition by using Polypyrrole, polyethylene 2-hydroxyl thiophene, polyaniline and derivative or their compound can reduce the impedance of electrolytic capacitor as the solid electrolyte of electroconductive polymer.
Solid electrolyte forms by following mode.Capacity cell is immersed in for example comprises as in a of the ethene 2-hydroxyl thiophene of the single polymers of polynary ring type and 2 parts of P-toluenesulfonic acid two iron and polymeric solution as 4 parts of polymer solvent η-butyraldehyde as oxidant.After capacitor element sling,, utilize polyethylene 2-hydroxyl thiophene so that can form by being placed in 85 ℃ of environment of 60 minutes
Claims (9)
1. the manufacture method of an electrolytic capacitor comprises:
Preparation comprises opposed first and second conductor foils and the operation of the capacitor element of the spacer that has been provided with between above-mentioned first and second conductor foil;
From the capacitor element of above-mentioned preparation, sub-elect operation by the capacitor element of electric current below setting that after applying direct voltage between above-mentioned first and second conductor foil of the capacitor element of above-mentioned preparation, flows through;
Make the above-mentioned capacitor element that sub-elects soak the operation that contains electrolyte;
The above-mentioned capacitor element that contains electrolyte that soaked is inserted in operation in the housing.
2. the manufacture method of capacitor as claimed in claim 1 is characterized in that: the operation of above-mentioned preparation capacitor element comprises lead-in wire is connected to operation on above-mentioned first and second conductor foils.
3. the manufacture method of capacitor as claimed in claim 1 is characterized in that: the operation of above-mentioned preparation capacitor element comprises the operation of reel above-mentioned first and second conductor foils and above-mentioned spacer.
4. the manufacture method of capacitor as claimed in claim 1 is characterized in that: the operation of above-mentioned sorting capacitor element comprises and sub-elects the operation that applies the capacitor element that above-mentioned direct voltage after-current do not pass through between above-mentioned first and second conductor foil.
5. the manufacture method of capacitor as claimed in claim 1, it is characterized in that: above-mentioned direct voltage is 600～1200V.
6. the manufacture method of capacitor as claimed in claim 1, it is characterized in that: the moisture content that makes above-mentioned spacer is below 7%.
7. the manufacture method of capacitor as claimed in claim 1 is characterized in that: the above-mentioned operation that contains electrolyte of soaking comprises above-mentioned capacitor element is immersed in operation in the conductive-polymer solution.
8. the manufacture method of capacitor as claimed in claim 1 is characterized in that: the above-mentioned operation that contains electrolyte of soaking is included in the operation that forms solid electrolyte layer on the above-mentioned spacer.
9. the manufacture method of capacitor as claimed in claim 1 is characterized in that: also comprise the operation of sealing above-mentioned shell nozzle portion with closure member.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP114580/02 | 2002-04-17 | ||
| JP2002114580A JP4738703B2 (en) | 2002-04-17 | 2002-04-17 | Electrolytic capacitor manufacturing method |
| JP114580/2002 | 2002-04-17 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1452190A CN1452190A (en) | 2003-10-29 |
| CN100428380C true CN100428380C (en) | 2008-10-22 |
Family
ID=29243391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021598169A Expired - Lifetime CN100428380C (en) | 2002-04-17 | 2002-12-27 | Method for mfg. electrolytic capacitor |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4738703B2 (en) |
| CN (1) | CN100428380C (en) |
| TW (1) | TWI285382B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2014007422A (en) * | 2013-09-12 | 2014-01-16 | Shin Etsu Polymer Co Ltd | Solid electrolytic capacitor and method for manufacturing the same |
| JP6295412B2 (en) * | 2014-01-30 | 2018-03-20 | パナソニックＩｐマネジメント株式会社 | Capacitor manufacturing method and capacitor inspection apparatus |
| CN114068192A (en) * | 2021-11-20 | 2022-02-18 | 深圳市力容电子有限公司 | Ultra-low temperature rise core package of high-voltage aluminum electrolytic capacitor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869946A (en) * | 1994-08-30 | 1996-03-12 | Nichicon Corp | Manufacture of capacitor element |
| CN1247372A (en) * | 1998-09-07 | 2000-03-15 | 松下电器产业株式会社 | Aluminium electrolytic capacitor and mfg. method thereof |
| JP2002100544A (en) * | 2000-09-21 | 2002-04-05 | Murata Mfg Co Ltd | Screening method of lamination electronic component |
-
2002
- 2002-04-17 JP JP2002114580A patent/JP4738703B2/en not_active Expired - Lifetime
- 2002-12-10 TW TW91135718A patent/TWI285382B/en not_active IP Right Cessation
- 2002-12-27 CN CNB021598169A patent/CN100428380C/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0869946A (en) * | 1994-08-30 | 1996-03-12 | Nichicon Corp | Manufacture of capacitor element |
| CN1247372A (en) * | 1998-09-07 | 2000-03-15 | 松下电器产业株式会社 | Aluminium electrolytic capacitor and mfg. method thereof |
| JP2002100544A (en) * | 2000-09-21 | 2002-04-05 | Murata Mfg Co Ltd | Screening method of lamination electronic component |
Also Published As
| Publication number | Publication date |
|---|---|
| TW200305897A (en) | 2003-11-01 |
| TWI285382B (en) | 2007-08-11 |
| CN1452190A (en) | 2003-10-29 |
| JP2003309040A (en) | 2003-10-31 |
| JP4738703B2 (en) | 2011-08-03 |
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Granted publication date: 20081022 |