WO2005086193A1 - 固体電解コンデンサ、固体電解コンデンサに用いる陽極、およびそのような陽極の製造方法 - Google Patents
固体電解コンデンサ、固体電解コンデンサに用いる陽極、およびそのような陽極の製造方法 Download PDFInfo
- Publication number
- WO2005086193A1 WO2005086193A1 PCT/JP2005/003892 JP2005003892W WO2005086193A1 WO 2005086193 A1 WO2005086193 A1 WO 2005086193A1 JP 2005003892 W JP2005003892 W JP 2005003892W WO 2005086193 A1 WO2005086193 A1 WO 2005086193A1
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- WIPO (PCT)
- Prior art keywords
- sintered body
- anode
- metal plate
- solid electrolytic
- electrolytic capacitor
- Prior art date
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 73
- 239000007787 solid Substances 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 229910052751 metal Inorganic materials 0.000 claims abstract description 116
- 239000002184 metal Substances 0.000 claims abstract description 116
- 230000009471 action Effects 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims description 35
- 239000000843 powder Substances 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 22
- 238000005245 sintering Methods 0.000 description 19
- 229910052758 niobium Inorganic materials 0.000 description 13
- 239000010955 niobium Substances 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- 229920005989 resin Polymers 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 239000008188 pellet Substances 0.000 description 10
- 229910000484 niobium oxide Inorganic materials 0.000 description 9
- URLJKFSTXLNXLG-UHFFFAOYSA-N niobium(5+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Nb+5].[Nb+5] URLJKFSTXLNXLG-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- 238000005304 joining Methods 0.000 description 8
- 238000007789 sealing Methods 0.000 description 8
- 239000007784 solid electrolyte Substances 0.000 description 7
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 229910052715 tantalum Inorganic materials 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007769 metal material Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- 239000010405 anode material Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- YTPZWYPLOCEZIX-UHFFFAOYSA-N [Nb]#[Nb] Chemical compound [Nb]#[Nb] YTPZWYPLOCEZIX-UHFFFAOYSA-N 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001940 conductive polymer Polymers 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- -1 for example Inorganic materials 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- MIVBAHRSNUNMPP-UHFFFAOYSA-N manganese(2+);dinitrate Chemical compound [Mn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O MIVBAHRSNUNMPP-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/15—Solid electrolytic capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
- H01G9/052—Sintered electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-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
- H01G9/04—Electrodes or formation of dielectric layers thereon
Definitions
- Solid electrolytic capacitor anode used for solid electrolytic capacitor, and method for producing such anode
- the present invention relates to a solid electrolytic capacitor using a porous sintered body made of a metallic material having a valve action, and particularly to an anode used for such a solid electrolytic capacitor.
- the present invention also relates to a method for producing such an anode.
- the conventional anode includes a metal plate 91 and a porous sintered body 94 formed on the metal plate, as shown in FIG. 15A of the present application.
- Each of the metal plate 91 and the sintered body 94 also becomes a metal material having a valve action (hereinafter, referred to as “valve action metal”).
- the illustrated anode X is manufactured by applying a predetermined material 93 containing a valve metal powder 92 on a metal plate 91 and then sintering the material 93. .
- a sintered body 94 having a desired size and a small thickness can be easily formed in a plan view. This means that the capacitance of the solid electrolytic capacitor using the anode X, ESR (equivalent series resistance), and ESL (equivalent series inductance) can be easily adjusted.
- Patent Document 1 JP-A-59-219923
- the capacitance per unit volume of the sintered body 94 may be increased in order to increase the capacitance while suppressing the size of the capacitor from increasing.
- the binder solution contained in this material volatilizes during the sintering of the material 93, and the powder 92 remaining on the anode metal plate 91 is sintered to form a porous material.
- the high-quality sintered body 94 is constituted.
- the porous No special treatment for increasing the density of the sintered body 94 is performed.
- the anode X cannot adequately respond to the demands for downsizing and large-capacity solid electrolytic capacitors, where the capacitance per unit volume of the porous sintered body 94 is not sufficiently high. There was a problem.
- an object of the present invention is to provide an anode for a solid electrolytic capacitor capable of achieving both small size and large capacity. It is another object of the present invention to provide a solid electrolytic capacitor provided with such an anode. Still another object of the present invention is to provide a method for producing such an anode.
- the present invention takes the following technical measures.
- An anode for a solid electrolytic capacitor provided by the first aspect of the present invention includes a metal plate made of a valve metal and a porous sintered body formed on the metal plate and made of a valve metal. And
- the porous sintered body includes a first sintered body and a second sintered body interposed between the first sintered body and the metal plate.
- the first sintered body has a higher density than the second sintered body.
- the first sintered body is separated from the metal plate and is not directly joined. For this reason, it is not necessary to consider the bondability with the metal plate when selecting the material forming the first sintered body. As a result, the range of material selection is expanded, and it becomes possible to select a material and a manufacturing method suitable for increasing the density of the sintered body. Also, by obtaining a high-density sintered body, it is possible to increase the capacitance of the anode while reducing the size of the anode, and to reduce the size and increase the capacitance of the solid electrolytic capacitor. Can be. On the other hand, due to the large capacity of the first sintered body, the density of the second sintered body does not need to be so large.
- a material suitable for joining to both the first sintered body and the metal plate can be selected as a material for forming the second sintered body.
- the first sintered body has a flat shape. According to such a configuration, since the current path in the first sintered body is shortened, it is necessary to reduce the resistance and inductance as desired.
- the metal plate is formed as a metal case that at least partially protects the first and second sintered bodies.
- the metal case can have higher rigidity than, for example, resin. Therefore, when using the solid electrolytic capacitor provided with the anode, it is possible to suppress the deformation of the solid electrolytic capacitor due to the heat generated in the first and second sintered bodies.
- the first sintered body includes a plurality of sintered body elements, and these sintered body elements are arranged side by side in a direction intersecting their thickness direction.
- the volume of the first sintered body (total volume of the sintered body elements) included in the anode can be increased without increasing the size of each sintered body element.
- such a problem can be appropriately avoided.
- the solid electrolytic capacitor provided by the second aspect of the present invention includes an anode having the above-described configuration. According to such a configuration, as can be understood from the explanation of the anode, it is possible to achieve both a reduction in the size and an increase in the capacity of the solid electrolytic capacitor, and to achieve a low ESR and a low ESL. Is also advantageous.
- At least a part of the metal plate functions as an external anode terminal for external connection.
- the metal plate functions as an external anode terminal for external connection.
- low resistance and low inductance between the first sintered body and the external anode terminal can be achieved.
- a method for producing an anode for a solid electrolytic capacitor provided by the third aspect of the present invention Joining a porous body formed by compressing powder of valve action metal and a metal plate made of valve action metal using a joining material containing powder of valve action metal; To form a porous sintered body by heating while being bonded to the metal plate.
- the anode for a solid electrolytic capacitor provided by the first aspect of the present invention can be appropriately and efficiently manufactured.
- the porous body in order to finish the porous sintered body at a high density, the porous body may be made to have a fine space even after being compressed by a large pressure, for example, by using powder having an appropriate average particle size. It is preferably formed as having a high density.
- the porous body is not directly joined to the metal plate. Therefore, the porous body can be formed as a material having a large density that does not need to have characteristics suitable for joining with the metal plate. As a result, the porous sintered body can be finished at a high density.
- the porous sintered body formed by the above-mentioned joining material does not need to have a high density. Therefore, as the above-mentioned joining material, a material which is well adapted to both the porous body and the metal plate and can be appropriately joined by being heated can be selected.
- the method for manufacturing an anode for a solid electrolytic capacitor provided by the fourth aspect of the present invention includes a step of preparing a porous sintered body made of a valve action metal and a metal plate made of a valve action metal. Joining the porous sintered body and the metal plate using a joining material containing powder of valve action metal. Even with such a configuration, the anode for a solid electrolytic capacitor provided by the first aspect of the present invention can be appropriately and efficiently manufactured.
- the porous sintered body is formed, for example, by sintering the porous body alone, and is joined to the metal plate after the sintering.
- FIG. 1 is a perspective view showing an anode for a solid electrolytic capacitor according to a first embodiment of the present invention.
- FIG. 2 is a sectional view taken along the line ⁇ - ⁇ in FIG. 1.
- FIG. 3 is a cross-sectional view illustrating one step of a method for manufacturing the anode shown in FIG.
- FIG. 4 is a sectional view illustrating a step that follows the step of FIG. 3.
- FIG. 5 is a cross-sectional view explaining a step that follows the step of FIG. 4.
- FIG. 6 is a cross-sectional view illustrating a step that follows the step of FIG.
- FIG. 7 is a cross-sectional view illustrating a solid electrolytic capacitor using the anode shown in FIG.
- FIG. 8 is a sectional view taken along the line vm-vm in FIG. 7.
- FIG. 9 is a perspective view showing an anode for a solid electrolytic capacitor according to a second embodiment of the present invention.
- FIG. 10 is a sectional view taken along the line XX in FIG. 9.
- FIG. 11 is a sectional view taken along the line XI-XI in FIG. 9.
- FIG. 12 is a cross-sectional view illustrating a solid electrolytic capacitor using the anode shown in FIG.
- FIG. 13 is a sectional view taken along the line ⁇ - ⁇ in FIG.
- FIG. 14 is a perspective view showing an anode for a solid electrolytic capacitor according to a third embodiment of the present invention.
- FIG. 15A is a cross-sectional view showing a conventional anode for a solid electrolytic capacitor
- FIG. 15B is a cross-sectional view illustrating a method for manufacturing the above-mentioned conventional anode.
- FIG. 1 and FIG. 2 show an example of an anode for a solid electrolytic capacitor according to a first embodiment of the present invention.
- the illustrated anode A1 includes an anode metal plate 1 and porous first and second sintered bodies 2a and 2b.
- the first sintered body 2a is formed by pressing a niobium powder, which is a metal material having a valve action (“valve action metal”), into a rectangular plate shape and sintering it. I have.
- the first sintered body 2a is provided on the anode metal plate 1 via the second sintered body 2b.
- the material of the first sintered body 2a for example, tantalum or the like may be used instead of niobium if it is a metal having a valve action. May be used. Note that niobium is superior in flame retardancy as compared with tantalum, and is preferable as a material of the first sintered body 2a which generates heat when used.
- the second sintered body 2b is provided between the first sintered body 2a and the anode metal plate 1.
- the second sintered body 2b is formed by sintering a bonding material containing niobium powder by a manufacturing method described later.
- the anode metal plate 1 is made of niobium, like the first and second sintered bodies 2a and 2b, and has two ends la and lb and a central part lc.
- the anode metal plate 1 is bent so that a step is formed between the center part lc and each end part la, lb.
- a first sintered body 2a is laminated via a second sintered body 2b. Both ends la and lb are used as external anode terminals for external connection in a solid electrolytic capacitor using the anode A1 as described later.
- a porous body serving as a prototype of the first sintered body 2a is formed.
- a niobium powder 21a is filled in a concave portion 61a formed in a die 61 of a mold 6.
- the punch 62 that can be fitted into the recess 61a is lowered from above the die 61.
- the lowering of the punch 62 compresses the powder 21a in the concave portion 61a to form the porous body 22a.
- the compression force of the punch 62 is, for example, such that the powder 21a can be compression-molded into a porous body 22a having a volume of about 1Z2-1Z3.
- the first sintered body 2a formed from the porous body 22a in the subsequent process has a dielectric layer (not shown) and a solid electrolyte layer (not shown) on its inner surface and part of the outer surface.
- a dielectric layer not shown
- a solid electrolyte layer not shown
- the powder 21a can be formed into a high-density porous body 22a by compression of the punch 62, and a minute space can be sufficiently formed therein. It is desirable to choose something that is appropriate.
- an anode metal plate 1 that is bent so as to generate a step between the central part lc and both ends la and lb is prepared.
- the bonding material 23b is applied to the upper surface of the central part lc of the anode metal plate 1.
- the bonding agent 23b converts the niobium powder 21b into, for example, a binder solution. It is mixed in the liquid.
- the above-described porous body 22a is joined to anode metal plate 1 via joining material 23b. In this way, as shown in FIG. 6, the anode material A1 'in which the porous body 22a is laminated on the anode metal plate 1 via the bonding material 23b is formed.
- the anode material A1 is heated while the porous body 22a is laminated on the anode metal plate 1.
- the porous body 22a is sintered to produce the first sintered body 2a.
- the bonding material 23b by heating the bonding material 23b, the binder solution contained in the bonding material 23b is volatilized.
- the second sintered body 2b is obtained by sintering the powder 21b contained in the joining material 23b. From the viewpoint of preventing oxidation and nitridation, this heating is preferably performed in an atmosphere such as argon gas.
- a dielectric layer is formed on a part of the inner and outer surfaces of the first and second sintered bodies 2a and 2b by, for example, a chemical conversion treatment using a phosphoric acid aqueous solution with respect to the anode A1. Further, a solid electrolyte layer is formed on the dielectric layer using a processing solution such as a manganese nitrate solution or a conductive polymer solution. Through such processing, a solid electrolytic capacitor using the anode A1 can be manufactured.
- a processing solution such as a manganese nitrate solution or a conductive polymer solution.
- FIGS. 7 and 8 show an example of a solid electrolytic capacitor using the anode A1.
- the illustrated solid electrolytic capacitor B1 includes a cathode metal plate 3, a sealing resin 5, and the like in addition to the anode A1 described above.
- the cathode metal plate 3 is adhered to the upper surface of the first sintered body 2a via the conductive layer 4, and is electrically connected to a solid electrolyte layer (not shown) formed on the first sintered body 2a.
- the conductive layer 4 is composed of, for example, a graphite layer and a silver paste layer laminated on the solid electrolyte layer.
- the sealing resin 5 is provided so as to partially cover the first and second sintered bodies 2a and 2b, the anode metal plate 1 and the cathode metal plate 3.
- Both ends la and lb of the anode metal plate 1 exposed from the sealing resin 5 are external positive terminals for input and output, respectively. Further, portions of the cathode metal plate 3 exposed from the sealing resin 5 serve as input and output external cathode terminals 3a and 3b.
- the solid electrolytic capacitor B1 is provided with the external anode terminals la and lb for input and output and the external cathode terminals 3a and 3b for input and output, and can be surface-mounted using these terminals. It is configured as a so-called four-terminal solid electrolytic capacitor.
- first sintered body 2a is directly joined to anode metal plate 1. Absent. Therefore, the first sintered body 2a does not need to have characteristics suitable for bonding with the anode metal plate 1.
- the material of the porous body 22a it is possible to select a powder having an average particle size suitable for forming a fine space inside while being compressed by a high pressure to have a high density. is there.
- the first sintered body 2a can be finished at a high density by forming the porous body 22a at a high density by force and pressure forming.
- the capacitance per unit volume can be increased, and the solid electrolytic capacitor B1 can be reduced in size and large in capacity.
- the second sintered body 2b since the solid electrolytic capacitor B1 can have a large capacity by the first sintered body 2a, the second sintered body 2b does not need to be finished at a high density.
- the second sintered body 2b is formed using a bonding material 23b containing 2 lb of powder having an average particle diameter suitable for bonding the first sintered body 2a and the anode metal plate 1 and a binder solution. can do.
- the bonding between the first and second sintered bodies 2a, 2b and the anode metal plate 1 is reliably performed, and the low ESR resistance and the low inductance of the solid electrolytic capacitor B1 reduce the resistance and the inductance. ESL can be achieved.
- the current path between the anode metal plate 1 and the cathode metal plate 3 is shortened.
- low resistance and low inductance between the anode metal plate 1 and the cathode metal plate 3 are achieved, which is suitable for low ESR and low ESL of the solid electrolytic capacitor B1.
- the external anode terminals la and lb are formed using a part of the anode metal plate 1. For this reason, there is no need to separately prepare members for forming the external anode terminals la and lb. Therefore, it is possible to improve efficiency and reduce cost in manufacturing the solid electrolytic capacitor B1.
- the integral formation of the external anode terminal and the anode metal plate is advantageous for low ESR and low ESL because it is not necessary to join a plurality of metal members.
- the porous body 22a is sintered alone to form a first sintered body 2a, and the first sintered body 2a is formed.
- the binder 2a may be joined to the anode metal plate 1 via a joining material 23b.
- the bonding material 23b is not sintered in the process of sintering the porous body 22a.
- the powder 21b contained in the bonding material 23b is a relatively average powder so that the powder 21b is well compatible with the first sintered body 2a and the anode metal plate 1. Those having a small particle size may be used. Such a powder 21b can be sintered at a relatively low temperature.
- the powder 21b is overheated together with the porous body 22a, it will be excessively sintered, and the first sintered body 2a or the anode metal plate 1 and the second sintered body 2b are properly joined. None can happen.
- Such a problem is solved by sintering the porous body 22a alone as described above. After joining the obtained first sintered body 2a to the anode metal plate 1 via the joining material 23b, the temperature is raised to a temperature suitable for sintering the joining material 23b, whereby the second sintered body 2b And anode metal plate 1 can be appropriately joined.
- FIGS. 9 to 14 show another embodiment of the present invention.
- the same or similar elements as those in the first embodiment are denoted by the same reference numerals.
- FIGS. 9 to 11 show an example of an anode for a solid electrolytic capacitor according to a second embodiment of the present invention.
- the illustrated anode A2 differs from the first embodiment in that a metal case 11 is provided instead of the anode metal plate 1.
- the metal case 11 includes two ends 11a and lib protruding in opposite directions, a base llc, and four side walls lid.
- the end portions 11a and 11b are used as input and output external anode terminals in a solid electrolytic capacitor described later.
- the base 11c and the four side walls lid define a space for accommodating the first and second sintered bodies 2a, 2b.
- the upper surface of the first sintered body 2a is located at a position lower than the upper edge of the side wall portion Id. That is, the first sintered body 2a (and the second sintered body 2b) is completely accommodated in the accommodation space.
- FIG. 12 and FIG. 13 show an example of a solid electrolytic capacitor using the anode A2 described above. are doing.
- the upper and lower sides of the anode A2 are drawn so as to be opposite to each other.
- the cathode metal plate 3 is laminated on the lower surface of the first sintered body 2a via the conductive layer 4.
- the central portion 3c of the cathode metal plate 3 is covered with a sealing resin 5, and both ends exposed from the sealing resin 5 are external cathode terminals 3a and 3b.
- the insulating resin 51 is for preventing the conductive layer 4 and the solid electrolyte layer (not shown) from being unduly conducted to the metal cover 11 in the manufacture of the solid electrolytic capacitor B2.
- the insulating portion 52 is a portion where the insulating resin 51 has entered a part of the first and second sintered bodies 2a and 2b, and has the same function as the insulating resin 51. Most of the outer surface of the metal case 11 is provided with a resin coating 53. Thus, when the solid electrolytic capacitor B2 and other electronic components are mounted on, for example, a circuit board, it is possible to prevent the electronic components from being unduly conducted to the metal case 11.
- the metal cover 11 has higher rigidity than the sealing resin 5. Therefore, even when heat is generated in the first and second sintered bodies 2a and 2b when the solid electrolytic capacitor B2 is used, the entire solid electrolytic capacitor B2 is prevented from being unduly bent. be able to. Further, the metal cover 11 has better thermal conductivity than the sealing resin 5. Therefore, the heat generated from the first and second sintered bodies 2a and 2b can be appropriately dissipated, and is suitable for use in power supply of a large capacity.
- FIG. 14 shows an anode according to a third embodiment of the present invention.
- the illustrated anode A3 differs from the anode A1 of the first embodiment in that the first sintered body is composed of a plurality of (two in the illustrated example) sintered elements 2a.
- the sintered body elements 2a have a flat shape and are arranged side by side in a direction intersecting their thickness direction (upward and downward direction in FIG. 14).
- the anode A3 can be manufactured by the same method as the above-described method for manufacturing the anode A1.
- the third embodiment employs a configuration in which a plurality of sintered body elements 2a are used as a first sintered body.
- This makes it possible to increase the volume of the first sintered body (ie, the total volume of the sintered body element 2a) while reducing the thickness of the first sintered body (ie, the thickness of the sintered body element 2a).
- this requirement may be realized by a single sintered body as in the first embodiment (see FIG. 1).
- the first sintered body may be constituted by a plurality of sintered body elements capable of forming the first sintered body.
- the number of the sintered body elements 2a is not limited to two, and may be a configuration including three or more sintered body elements. Further, a configuration in which a plurality of sintered body elements are arranged in a matrix may be used.
- the solid electrolytic capacitor is not limited to the embodiments described above.
- the specific configuration of each part of the solid electrolytic capacitor can be freely changed in various designs.
- the first sintered body has a flat shape for low ESR and low ESL.
- the present invention is not limited to this, and may be configured to include a first sintered body having a shape other than a flat shape.
- valve metal for example, tantalum may be used instead of niobium.
- an alloy containing niobium or tantalum may be used.
- niobium oxide it is better to use as a valve metal.
- a molded body (pellet) made of niobium oxide powder should be very fused to niobium as a pure metal at a temperature of about 1100 ° C, preferably 1400 ° C or more.
- a phenomenon that supports this is that when a pellet that also has niobium powder power is sintered on a tray that also has niobium power, the sintered body of the pellets is fused to the tray and cannot be removed. That is.
- the present inventor has confirmed that oxygen in niobium oxide diffuses into niobium metal based on such a fusion phenomenon.
- niobium oxide powders have a property that sintering is less likely to proceed than niobium metal powders. Due to this characteristic, pellets having a powdery niobium powder can be sintered at a high temperature.
- the constituent members (metal plate, first sintered body, and second sintered body) of the anode for a capacitor of the present invention are appropriately replaced with niobium oxide (or containing niobium oxide).
- Material ) A force may also be formed.
- the metal plate 1 and the first sintered body 2a are formed of niobium
- the second sintered body 2b is formed of niobium oxide. According to such a configuration, it is possible to perform joining of the second sintered body 2b and the metal plate 1 and joining of the second sintered body 2b and the first sintered body 2a with appropriate strength. .
- Titanium powder and niobium powder easily sinter at a relatively low temperature and relatively high temperature (in other words, they cannot be sintered at a high temperature) with respect to the above-mentioned acid niobium. Therefore, as the powder particle size becomes smaller, it becomes more difficult to appropriately perform sintering between the tantalum powder or the niobium powder pellet and the metal plate. Such a situation is not preferable especially when the pellets are large. In other words, the larger the pellet, the greater the shrinkage of the pellet during sintering, but this makes it impossible to properly join the pellet (sintered body) and the metal plate during sintering. .
- Another disadvantage due to the low sintering temperature is as follows.
- the LC per unit area tends to increase.
- One of the reasons is the presence of carbon and the like remaining in the sintered body.
- Such residual carbon can be removed if the sintering temperature is high, but cannot be removed at low temperatures used for sintering tantalum powder or niobium powder.
- Such a problem can be solved by using niobium oxide having a high sintering temperature. Residual carbon can also be removed by oxygen contained in niobium oxide.
- the present invention is not limited to this.
- a configuration may be used in which a separately prepared member for an external anode terminal is conducted to a flat anode metal plate.
- the structure of the solid electrolytic capacitor is not limited to the structure of the capacitor described above, and may be a so-called two-terminal type or three-terminal type. In the present invention, the use of the solid electrolytic capacitor is not limited to a specific one.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800075007A CN1930648B (zh) | 2004-03-08 | 2005-03-07 | 固体电解电容器、用于固体电解电容器的阳极、该阳极的制造方法 |
JP2006510770A JP4579908B2 (ja) | 2004-03-08 | 2005-03-07 | 固体電解コンデンサ、固体電解コンデンサに用いる陽極 |
US10/592,192 US7554794B2 (en) | 2004-03-08 | 2005-03-07 | Solid electrolytic capacitor, anode used for solid electrolytic capacitor, and method of manufacturing the anode |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004063326 | 2004-03-08 | ||
JP2004-063326 | 2004-03-08 |
Publications (1)
Publication Number | Publication Date |
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WO2005086193A1 true WO2005086193A1 (ja) | 2005-09-15 |
Family
ID=34918156
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/003892 WO2005086193A1 (ja) | 2004-03-08 | 2005-03-07 | 固体電解コンデンサ、固体電解コンデンサに用いる陽極、およびそのような陽極の製造方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7554794B2 (ja) |
JP (1) | JP4579908B2 (ja) |
KR (1) | KR100850844B1 (ja) |
CN (1) | CN1930648B (ja) |
WO (1) | WO2005086193A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014175379A (ja) * | 2013-03-07 | 2014-09-22 | Nec Tokin Corp | 固体電解コンデンサ及びその製造方法 |
JP2017022221A (ja) * | 2015-07-09 | 2017-01-26 | Necトーキン株式会社 | 固体電解コンデンサおよびその製造方法 |
WO2018131691A1 (ja) * | 2017-01-13 | 2018-07-19 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011116939A1 (de) * | 2011-10-26 | 2013-05-02 | H.C. Starck Gmbh | Verzugsfreie schablonengedruckte Anoden auf Ta-/Nb-Blech |
US11257629B2 (en) | 2018-02-12 | 2022-02-22 | KYOCERA AVX Components Corporation | Solid electrolytic capacitor for a tantalum embedded microchip |
WO2020106406A1 (en) * | 2018-11-19 | 2020-05-28 | Avx Corporation | Solid electrolytic capacitor for a tantalum embedded microchip |
Citations (4)
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JPS6151911A (ja) * | 1984-07-13 | 1986-03-14 | スプラグ・エレクトリツク・カンパニ− | 改良された固体電解コンデンサおよびその製造法 |
JP2001185460A (ja) * | 1999-12-27 | 2001-07-06 | Matsushita Electric Ind Co Ltd | 固体電解コンデンサおよびその製造方法並びに回路基板 |
JP2003506887A (ja) * | 1999-08-10 | 2003-02-18 | エイブイエックス リミテッド | 固体コンデンサの製造 |
JP2003338433A (ja) * | 2002-05-22 | 2003-11-28 | Nec Tokin Corp | 固体電解コンデンサ用の陽極体、その製造方法及び固体電解コンデンサ |
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JPS59219923A (ja) | 1983-05-30 | 1984-12-11 | 日本電気株式会社 | 電解コンデンサ用陽極体 |
JP3443553B2 (ja) * | 1999-04-16 | 2003-09-02 | 松下電器産業株式会社 | 電解コンデンサ用電極及びその製造方法 |
DE60033076T2 (de) * | 1999-04-16 | 2007-08-30 | Matsushita Electric Industrial Co., Ltd., Kadoma | Anodische Elektrode für Elektrolytkondensator und Verfahren zu ihrer Herstellung |
JP4366055B2 (ja) * | 2002-08-01 | 2009-11-18 | ローム株式会社 | 固体電解コンデンサの製造方法 |
-
2005
- 2005-03-07 CN CN2005800075007A patent/CN1930648B/zh not_active Expired - Fee Related
- 2005-03-07 WO PCT/JP2005/003892 patent/WO2005086193A1/ja active Application Filing
- 2005-03-07 JP JP2006510770A patent/JP4579908B2/ja not_active Expired - Fee Related
- 2005-03-07 US US10/592,192 patent/US7554794B2/en not_active Expired - Fee Related
- 2005-03-07 KR KR1020067020205A patent/KR100850844B1/ko not_active IP Right Cessation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6151911A (ja) * | 1984-07-13 | 1986-03-14 | スプラグ・エレクトリツク・カンパニ− | 改良された固体電解コンデンサおよびその製造法 |
JP2003506887A (ja) * | 1999-08-10 | 2003-02-18 | エイブイエックス リミテッド | 固体コンデンサの製造 |
JP2001185460A (ja) * | 1999-12-27 | 2001-07-06 | Matsushita Electric Ind Co Ltd | 固体電解コンデンサおよびその製造方法並びに回路基板 |
JP2003338433A (ja) * | 2002-05-22 | 2003-11-28 | Nec Tokin Corp | 固体電解コンデンサ用の陽極体、その製造方法及び固体電解コンデンサ |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014175379A (ja) * | 2013-03-07 | 2014-09-22 | Nec Tokin Corp | 固体電解コンデンサ及びその製造方法 |
JP2017022221A (ja) * | 2015-07-09 | 2017-01-26 | Necトーキン株式会社 | 固体電解コンデンサおよびその製造方法 |
WO2018131691A1 (ja) * | 2017-01-13 | 2018-07-19 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
JPWO2018131691A1 (ja) * | 2017-01-13 | 2019-11-07 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
US11232913B2 (en) | 2017-01-13 | 2022-01-25 | Panasonic Intellectual Property Management Co., Ltd. | Electrolytic capacitor |
JP7113285B2 (ja) | 2017-01-13 | 2022-08-05 | パナソニックIpマネジメント株式会社 | 電解コンデンサ |
Also Published As
Publication number | Publication date |
---|---|
US20080198535A1 (en) | 2008-08-21 |
JP4579908B2 (ja) | 2010-11-10 |
CN1930648B (zh) | 2011-02-09 |
US7554794B2 (en) | 2009-06-30 |
JPWO2005086193A1 (ja) | 2008-01-24 |
KR20060114386A (ko) | 2006-11-06 |
CN1930648A (zh) | 2007-03-14 |
KR100850844B1 (ko) | 2008-08-06 |
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