CN100369168C - Solid electrolytic capacitor - Google Patents
Solid electrolytic capacitor Download PDFInfo
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- CN100369168C CN100369168C CNB031378064A CN03137806A CN100369168C CN 100369168 C CN100369168 C CN 100369168C CN B031378064 A CNB031378064 A CN B031378064A CN 03137806 A CN03137806 A CN 03137806A CN 100369168 C CN100369168 C CN 100369168C
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- anode
- solid electrolytic
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- electrolytic capacitor
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Abstract
The solid electrolytic capacitor is constituted of the dielectric oxidized skin layer, the solid electrolytic layer and a cathode layer which are formed sequentially, by forming/sintering valve effect metallic powder into which the anode lead wire is embedded. The anode lead wire is constituted of a metal having a melting point lower than that of the valve effect metallic powder forming the anode body whereby a metal fusion bonding efficiency between the valve effect metallic powder and the anode lead wire is improved. Thus, the solid electrolytic capacitor, strong against the external stress and showing excellent leakage current characteristics, is stably obtained.
Description
Technical field
The present invention relates to the solid electrolytic capacitor that uses in a kind of various e-machine.
Background technology
Fig. 5 is the cutaway view of existing solid electrolytic capacitor.Anode bodies 8 will form as intended shape as the tantalum metal powder drawing of one of valve metals by using the drawing metal pattern, when drawing, will be embedded in the anode bodies 8 by the anode tap 9 that the tantalum line constitutes.Outer surface at anode bodies 8 forms dielectric oxide film thereon layer 10, forms solid electrolytic capacitor 11 on dielectric oxide film thereon layer 10.On solid electrolytic capacitor 11, form carbon-coating 12a, on carbon-coating 12a, form elargol layer 12b.Form cathode layer 12 by carbon-coating 12a and elargol layer 12b.
Below, the manufacture method that has solid electrolytic capacitor now is described.At first, the tantalum metal powder input is formed in the drawing metal pattern of intended shape, size, bury the anode tap 9 that constitutes by the tantalum line therein underground, the one end is exposed, and after pressurization processing, be made into body.Then, by this formed body of sintering under high-temperature vacuum, make the anode bodies 8 of porous matter.Afterwards, by by the voltage corresponding to the expectation electrostatic condenser, antianode body 8 carries out anodised chemistry and generates and handle in electrolyte such as phosphate aqueous solution or aqueous solution of nitric acid, forms dielectric oxide film thereon layer 10 in outer surface.Then, on dielectric oxide film thereon layer 10, form the solid electrolyte layer 11 that constitutes by manganese dioxide and electroconductive polymer.And on solid electrolyte layer 11, form carbon-coating 12a and elargol layer 12b, thus form cathode layer 12, make solid electrolytic capacitor.
So in the existing solid electrolytic capacitor of making, not shown anode lead frame and cathode leg frame be connected on the anode tap 9 that exposes from anode bodies 8 and the cathode layer 12.Afterwards, be presented on respectively under the outside state,, obtain existing solid electrolytic capacitor as end article by covering by not shown insulating properties potting resin in the part of above-mentioned anode lead frame and cathode leg frame.
In above-mentioned existing solid electrolytic capacitor, because make anode bodies 8 by sintering, so in its intensity difference takes place, especially anode bodies 8 becomes big easily with the difference of the stiffness of coupling that is embedded in the anode tap 9 in this anode bodies 8.
The intensity of anode bodies 8 depends on the metal melting between metal melting between tantalum metal powder-tantalum metal powder or the tantalum metal powder-tantalum system anode tap 9.Therefore, rise in temperature before the fusing point of tantalum, during sintered anode body 8, stablize the stiffness of coupling that obtains by tantalum metal powder good metal melting each other, by comparison, because surface state difference between tantalum metal powder-tantalum system cathode leg 9 each other, so be difficult to the stable stiffness of coupling that the good metal fusion is become reconciled that obtains.In the capacitor a little less than the stiffness of coupling between tantalum metal powder-tantalum system cathode leg 9, fragment takes place or breaks in the external stress of formation operation and assembling procedure or potting resin forming process etc. by solid electrolyte layer 11 easily in as the anode bodies 8 of sintered body.Under the situation that these take place, destroy by chemistry and generate the dielectric oxide film thereon layer 10 that processing forms, leakage current increases.
Summary of the invention
Capacitor possesses: the anode bodies that is obtained by the valve metals powder; Be embedded in the above-mentioned anode bodies, make that an end exposes, derive line by fusing point than the anode that the low-melting metal of above-mentioned the 1st valve metals powder constitutes; Be formed on the dielectric oxide film thereon layer on the above-mentioned anode bodies; Be formed on the solid electrolyte layer of above-mentioned dielectric oxide film thereon layer top; With the cathode layer that is formed on above-mentioned solid electrolyte layer top.This capacitor illustrates strong, good leakage current characteristic to outside stress sheet.
Brief description of drawings
Fig. 1 is the cutaway view of the solid electrolytic capacitor of the embodiment of the invention.
The anode bodies internal structure of the solid electrolytic capacitor of the expression embodiment of Fig. 2 pattern.
Fig. 3 is the performance plot of lead-in wire pull-out strength of the solid electrolytic capacitor of expression embodiment.
Fig. 4 is the performance plot of leakage current characteristic of the solid electrolytic capacitor of expression embodiment.
Fig. 5 is the cutaway view of existing solid electrolytic capacitor.
Embodiment
Fig. 1 is the cutaway view of the solid electrolytic capacitor of one embodiment of the invention.Anode bodies 1 will form as intended shape as the tantalum metal powder drawing of one of valve metals by using the drawing metal pattern.When drawing, will be embedded in the anode bodies 1 by the anode tap 2 that the niobium line constitutes.Outer surface at anode bodies 1 forms dielectric oxide film thereon layer 3, forms solid electrolyte layer 4 on dielectric oxide film thereon layer 3.On solid electrolyte layer 4, form carbon-coating 5a, on carbon-coating 5a, form elargol layer 5b.Form cathode layer 5 by carbon-coating 5a and elargol layer 5b.
Below, the manufacture method of the solid electrolytic capacitor of embodiment is described.At first, the tantalum metal powder input is formed in the drawing metal pattern of intended shape, size, bury the anode tap 2 that constitutes by the niobium line therein underground, the one end is exposed, after the pressurization processing, be made into body.Then, by this formed body of sintering under high-temperature vacuum, make the anode bodies 1 of porous matter.
Afterwards, by by the voltage corresponding to the expectation electrostatic condenser, antianode body 1 carries out anodised chemistry and generates and handle in electrolyte such as phosphate aqueous solution or aqueous solution of nitric acid, forms dielectric oxide film thereon layer 3 in outer surface.Then, on dielectric oxide film thereon layer 3, form the solid electrolyte layer 4 that constitutes by manganese dioxide and electroconductive polymer.And on solid electrolyte layer 4, form carbon-coating 5a, and, form cathode layer 5 by further forming elargol layer 5b, make the solid electrolytic capacitor of embodiment.
So in the solid electrolytic capacitor of making, not shown anode lead frame and cathode leg frame be connected on the anode tap 2 that exposes from anode bodies 1 and the cathode layer 5, afterwards, part at above-mentioned anode lead frame and cathode leg frame is presented on respectively under the outside state, by covering, obtain solid electrolytic capacitor as end article by not shown insulating properties potting resin.
The internal structure of the anode bodies 1 of the solid electrolytic capacitor of the expression embodiment of Fig. 2 pattern.Near the boundary of anode tap 2 and anode bodies 1, there is the coupling part 7 of 2 of coupling part 6 between tantalum metal powder-tantalum metal powder and tantalum metal powders-niobium system anode tap.In an embodiment, in the valve metals that constitutes anode bodies 1, use tantalum metal powder, in anode tap 2, use niobium as one of valve metals.Because the fusing point of niobium (2500 ℃) is lower than the fusing point (3000 ℃) of tantalum, so coming under the situation of sintered anode body 1 as 3000 ℃ of tantalum fusing point, niobium system anode tap 2 is than easier bulk diffusion and the diffusion into the surface that causes niobium atom of tantalum metal powder under high-temperature vacuum.Therefore, promote metal melting, the result, the coupling part 7 that tantalum metal powder-niobium system anode tap is 2 is by the good metal fusion, stablizes to obtain good coupling intensity.Therefore, even obtain external stress is also represented the solid electrolytic capacitor of strong, good leakage current characteristic.
In an embodiment to the valve metals powder that is used as constituting anode bodies 1 with tantalum powder, the combination that is used as the anode tap 2 that is made of the fusing point metal lower than tantalum with niobium describes.But present embodiment is not limited thereto, and also can use niobium powder to come as the valve metals powder that constitutes anode bodies 1.As anode tap 2,, then also can use hafnium (fusing point: 2200 ℃), zirconium (fusing point: 1750 ℃), titanium (fusing point: 1660 ℃), aluminium (fusing point: 660 ℃) or their alloy if fusing point is lower than the metal dust of anode bodies 1.Table 1, and Fig. 3, Fig. 4 in the ratio of existing relatively anode bodies, the ratio that existing anode bodies is made as at 1 o'clock, represent to measure the anode tap pull-out strength of the anode bodies of from these materials, selecting several materials and making by combination and the result of leakage current.
From anode bodies 1, extracting in the strength detection of anode tap 2, measuring the power that applies when pulling out anode tap 2 of from anode bodies 1 part, finishing.In the mensuration of leakage current characteristic, measure and to apply the leakage current value after 60 seconds after the rated voltage.
Table 1
| The capacitor of embodiment | Existing capacitor | |||||
| Embodiment 1 | |
|
Embodiment 4 | |
||
| The material of anode tap 2 | Nb | Ti | Nb-Zr | Ti-Al | Ni | Ta |
| The dusty material of anode bodies 1 | Ta | Nb | Ta | Ta | Ta | Ta |
| The lead-in wire pull-out strength | 1.880 | 1.510 | 1.920 | 2.050 | 1.500 | 1.000 |
| Leakage current | 0.598 | 0.821 | 0.618 | 0.951 | 1.000 | 1.000 |
As known from Table 1, and all use the existing capacitor of tantalum to compare in the material of material that constitutes anode bodies 1 and anode tap 2, the capacitor of embodiment can obtain the effect that anode tap pull-out strength and leakage current characteristic all greatly improve.Especially, possess the anode bodies of tantalum metal powder and niobium system anode tap embodiment 1 capacitor and possess the anode bodies of tantalum metal powder and the capacitor of the embodiment 3 of niobium/zirconium alloy made anode tap can obtain the effect that anode tap pull-out strength and leakage current characteristic all obviously improve.
If the cross sectional shape of anode tap 2 is a rectangle, then the valve metals powder of anode bodies 1 increases with (coupling) area that contacts of 2 of anode taps, so can stablize the solid electrolytic capacitor that obtains expressing for external stress good leakage current characteristic.
Claims (8)
1. capacitor possesses:
The anode bodies that obtains by the 1st valve metals powder;
Be embedded in the described anode bodies, make that an end exposes, derive line by fusing point than the anode that the low-melting metal of described the 1st valve metals powder constitutes;
Be formed on the dielectric oxide film thereon layer on the described anode bodies;
Be formed on the solid electrolyte layer of described dielectric oxide film thereon layer top; With
Be formed on the cathode layer of described solid electrolyte layer top.
2. capacitor according to claim 1 is characterized in that: described anode is derived line and is made of the 2nd valve metals.
3. capacitor according to claim 1 is characterized in that: described anode is derived line and is made of the two or more at least alloys of forming.
4. capacitor according to claim 1 is characterized in that: the cross section that described anode is derived line is a rectangle.
5. capacitor according to claim 1 is characterized in that: described anode is derived line and is contained niobium.
6. capacitor according to claim 1 is characterized in that: described the 1st valve metals powder contains tantalum.
7. capacitor according to claim 1 is characterized in that: above-mentioned anode bodies is made by the sintered body of described the 1st valve metals powder.
8. capacitor according to claim 1 is characterized in that: described anode bodies is a porous matter.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002163937A JP2004014667A (en) | 2002-06-05 | 2002-06-05 | Solid electrolytic capacitor |
| JP2002163937 | 2002-06-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1467765A CN1467765A (en) | 2004-01-14 |
| CN100369168C true CN100369168C (en) | 2008-02-13 |
Family
ID=29996401
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031378064A Expired - Fee Related CN100369168C (en) | 2002-06-05 | 2003-05-21 | Solid electrolytic capacitor |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2004014667A (en) |
| CN (1) | CN100369168C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7177141B1 (en) * | 2005-07-28 | 2007-02-13 | Sanyo Electric Co., Ltd. | Solid electrolytic capacitor element, manufacturing method therefor, and solid electrolytic capacitor |
| JP4845699B2 (en) * | 2006-12-08 | 2011-12-28 | 三洋電機株式会社 | Solid electrolytic capacitor and method for producing solid electrolytic capacitor |
| JP4873415B2 (en) | 2007-02-28 | 2012-02-08 | 三洋電機株式会社 | Manufacturing method of solid electrolytic capacitor |
| JP2008244184A (en) | 2007-03-28 | 2008-10-09 | Sanyo Electric Co Ltd | Solid-state electrolytic capacitor and manufacturing method therefor |
| JP4911611B2 (en) | 2007-04-27 | 2012-04-04 | 三洋電機株式会社 | Solid electrolytic capacitor |
| CN101477897B (en) | 2009-01-20 | 2012-05-23 | 宁夏东方钽业股份有限公司 | Tantalum wire for tantalum capacitor anode lead wire and manufacturing process thereof |
| KR20130027785A (en) * | 2011-09-08 | 2013-03-18 | 삼성전기주식회사 | Tantalum capacitor |
| CN104603896B (en) | 2012-08-29 | 2018-07-03 | 松下知识产权经营株式会社 | Solid electrolytic capacitor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62184763A (en) * | 1986-02-07 | 1987-08-13 | Hitachi Ltd | Whole solid lithium battery |
-
2002
- 2002-06-05 JP JP2002163937A patent/JP2004014667A/en active Pending
-
2003
- 2003-05-21 CN CNB031378064A patent/CN100369168C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62184763A (en) * | 1986-02-07 | 1987-08-13 | Hitachi Ltd | Whole solid lithium battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004014667A (en) | 2004-01-15 |
| CN1467765A (en) | 2004-01-14 |
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Granted publication date: 20080213 Termination date: 20160521 |