CN201345299Y - High polymer solid-chip type tantalum electrolytic capacitor - Google Patents
High polymer solid-chip type tantalum electrolytic capacitor Download PDFInfo
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- CN201345299Y CN201345299Y CNU2008201237391U CN200820123739U CN201345299Y CN 201345299 Y CN201345299 Y CN 201345299Y CN U2008201237391 U CNU2008201237391 U CN U2008201237391U CN 200820123739 U CN200820123739 U CN 200820123739U CN 201345299 Y CN201345299 Y CN 201345299Y
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Abstract
The utility model discloses a high polymer solid-chip type tantalum electrolytic capacitor, which belongs to the field of electronic components. The tantalum electrolytic capacitor adopts the structure that a tantalum capacitor particle including a tantalum block anode with a tantalum wire leading-out wire, a dielectric layer and a high polymer cathode layer is arranged in an encapsulation casing; the tantalum block anode is wrapped by the dielectric layer, the dielectric layer is wrapped by the high polymer cathode layer, and the high-frequency electric conductivity of the high polymer cathode layer is 20S/cm; the tantalum wire leading-out wire of the tantalum block anode and the anode lead-out thread of the encapsulation casing are in electric connection; and the high polymer cathode layer and the cathode lead of the encapsulation casing are in electric connection. The tantalum electrolytic capacitor utilizes a Poly 3,4-Ethylene Dioxy Thiophene layer as a cathode, so that the cathode impedance of the tantalum electrolytic capacitor can be reduced by an order of magnitude compared with a manganese dioxide cathode, and the operating frequency thereof can be increased by one to two orders of magnitude; the tantalum electrolytic capacitor has remarkable high-frequency performance, can effectively improve safety, and can not burst into flames or explode like the cathode product made of manganese dioxide when accidental puncture happens during use.
Description
Technical field
The utility model relates to the electronic devices and components field, relates in particular to a kind of polymer solid sheet type tantalum electrolyte capacitor.
Background technology
The impedance of capacitor is higher, particularly high-frequency resistance is higher, can make the induction reactance of capacitor also higher, and the inductance of capacitor and impedance meeting become capacitive reactance with the increase of frequency, cause capacitor volume to descend, cause this capacitor to keep certain capacity in higher frequency.This capacitor can't be applied in the high-frequency circuit, if can occur when using in the higher circuit of frequency condenser capacity with frequency increase and the phenomenon that descends.
Just there is above-mentioned shortcoming in the tantalum electrolytic capacitor that is applied in excellent performance in the multiple circuit, there are relation as shown in Figure 1 in the capacity of tantalum electrolytic capacitor and test or frequency of utilization: promptly when testing or frequency of utilization when being increased to certain value, the capacity of tantalum electrolytic capacitor can reduce with the increase of frequency, when frequency is increased to resonance frequency with tantalum electrolytic capacitor when the same, the capacity of tantalum electrolytic capacitor will be lost, and become an inductance.
Cause the reason of this phenomenon of tantalum electrolytic capacitor to be: common sheet type tantalum electrolyte capacitor negative electrode adopts the semi-conducting material manganese dioxide of electronic conductance type, make the cathode impedance of sheet type tantalum electrolyte capacitor bigger, and then make tantalum electrolytic capacitor inductance and impedance meeting become capacitive reactance with the increase of frequency, cause the capacity of tantalum electrolytic capacitor to descend, and prior art can't make the high-frequency resistance of tantalum electrolytic capacitor lower by the technology processing again, make the sheet type tantalum electrolyte capacitor of excellent performance higher because of high-frequency resistance [ESR], frequency of utilization is subjected to strict restriction, almost can't use in the circuit more than operating frequency reaches the MHZ level.But because the development of microelectric technique is very fast, the main operating frequency of common processor all might reach more than the MHZ in the existing microelectronic circuit, carrying out the complicated digital circuit of logical operation, operating frequency is higher, and therefore the sheet type tantalum electrolyte capacitor that uses manganese dioxide to make negative electrode can not be used in this type of circuit substantially and use as filter element.This shortcoming of tantalum electrolytic capacitor has limited the range of application of sheet type tantalum electrolyte capacitor greatly.
The utility model content
Based on above-mentioned existing in prior technology problem, the utility model execution mode provides a kind of polymer solid sheet type tantalum electrolyte capacitor, hang down material as the tantalum electrolytic capacitor cathode material with high-frequency resistance, make tantalum electrolytic capacitor avoid causing capacity to diminish, can be applicable in the higher circuit of multiple frequency because of frequency is high.
The purpose of this utility model is achieved through the following technical solutions:
The utility model execution mode provides a kind of polymer solid sheet type tantalum electrolyte capacitor, comprising:
In package casing, be provided with tantalum electric capacity particle, described tantalum electric capacity particle is made of tantalum piece anode, dielectric layer and the polymer cathode layer of band tantalum wire lead-out wire, tantalum piece anode coats dielectric layer outward, dielectric layer coats polymer cathode layer outward, the high-frequency electrical conductance of polymer cathode layer is 20S/cm, the tantalum wire lead-out wire of described tantalum piece anode is electrically connected with the anode lead wire of package casing, and polymer cathode layer is electrically connected with the cathode terminal of encapsulating housing.
Described polymer cathode layer is the clad structure layer that 3,4 ethene dioxythiophene PEDT materials form.
The thickness of the clad structure layer that described 3,4 ethene dioxythiophene PEDT materials form is 0.2～0.3 millimeter.
The technical scheme that is provided by above-mentioned the utility model execution mode as can be seen, in the utility model execution mode with 3,4 ethene dioxythiophene PEDT layers are as the negative electrode of tantalum electrolytic capacitor, the cathode impedance that makes tantalum electrolytic capacitor is high-frequency resistance especially, the tantalum electrolytic capacitor that can compare manganese dioxide cathodes reduces an order of magnitude, make the operating frequency of this tantalum electrolytic capacitor also can improve one to two order of magnitude, has outstanding high frequency performance, can be applied in the above circuit of MHz, and also effectively improved the fail safe of tantalum electrolytic capacitor, when in this tantalum electrolytic capacitor with macromolecule negative electrode uses, unexpected the puncture occurring, can catching fire or blast as manganese dioxide is made the product of negative electrode.
Description of drawings
Fig. 1 changes schematic diagram for the frequency capability of the tantalum electrolytic capacitor that existing manganese dioxide is negative electrode;
Fig. 2 is the structural formula figure of negative electrode 3, the 4 ethene dioxythiophene materials among the utility model embodiment;
Fig. 3 is the inner encapsulating structure schematic diagram of the tantalum electrolytic capacitor of the utility model embodiment;
Fig. 4 is the interior tantalum electric capacity particle cross-sectional view of tantalum electrolytic capacitor of the utility model embodiment;
Fig. 5 is the tantalum electrolytic capacitor manufacturing process schematic diagram of the utility model embodiment;
Among the figure: 1. encapsulating housing; 2. cathode terminal; 3. tantalum electric capacity particle; 4. anode lead wire; 5. tantalum wire lead-out wire; 6. pad; 21. tantalum piece anode; 22. dielectric layer; 23. polymer cathode layer.
Embodiment
The utility model execution mode provides a kind of polymer solid sheet type tantalum electrolyte capacitor, be to be anode with the tantalum piece, polymerization forms 3 on the dielectric layer of tantalum piece anode, 4 ethene dioxythiophene PEDT layers are as the macromolecule negative electrode, and the encapsulation back forms the solid sheet type tantalum electrolyte capacitor with macromolecule negative electrode.Because 3, the excellent low impedance at high frequency characteristic of 4 ethene dioxythiophene PEDT materials, make the high-frequency resistance of this tantalum electrolytic capacitor can improve one to two order of magnitude with comparing with the tantalum electrolytic capacitor of manganese dioxide cathodes, can be used in the higher circuit of frequency, can not cause the reduction of tantalum electrolytic capacitor capacity because of the raising of place channel frequency.And in that this tantalum electrolytic capacitor is unexpected when puncturing, can catching fire or blast, fail safe is higher.
Understanding for ease of to the utility model embodiment is described further below in conjunction with accompanying drawing.
Embodiment one
Present embodiment provides a kind of polymer solid sheet type tantalum electrolyte capacitor, and this tantalum electrolytic capacitor is a negative electrode with the macromolecule conducting material, effectively reduces the high-frequency resistance of tantalum electrolytic capacitor, and as shown in Figure 3, Figure 4, this tantalum electrolytic capacitor specifically comprises:
In the encapsulating housing 1 of epoxy resin, be provided with tantalum electric capacity particle 3, this tantalum electric capacity particle 3 is by the tantalum piece anode 21 of band tantalum wire lead-out wire 5, dielectric layer 22 and polymer cathode layer 23 constitute, the tantalum piece anode 21 outer dielectric layers 22 that coat, the dielectric layer 22 outer polymer cathode layer 23 that coat, polymer cathode layer 23 is by polythiophene material (3,4 ethene dioxythiophenes, the English PEDT that is called for short, the concrete structure formula is referring to Fig. 2) polymerization forms on the dielectric layer 22 outside tantalum piece anode 21 structure sheaf, the thickness of this structure sheaf is generally 0.2～0.3 millimeter, the high-frequency electrical conductance of the polythiophene material polymer cathode layer that forms is 20S/cm, the tantalum wire lead-out wire 5 of the tantalum piece anode 21 of tantalum electric capacity particle 3 is electrically connected (generally by pad 6 tantalum wire lead-out wire 5 being welded on the anode lead wire 7) with the anode lead wire 7 of epoxy encapsulation housing 1, polymer cathode layer 23 is electrically connected with the cathode terminal 2 of epoxy encapsulation housing 1, so just forms the solid sheet type tantalum electrolyte capacitor with conductive polymer negative electrode.
When above-mentioned polymer solid sheet type tantalum electrolyte capacitor is specifically made,, undertaken, specifically comprise by following step referring to Fig. 5:
A. will be the briquet of the band tantalum wire lead-out wire of raw material compacting with the tantalum powder, after vacuum-sintering,, on the anode briquet behind the sintering, form dielectric layer as the anode briquet;
In the reality, above-mentioned steps a specifically comprises: be the tantalum powder of 8000-50000uF.V/g is pressed into band tantalum wire lead-out wire by 5.0～6.5 pressed density briquet with specific volume, 1400～1800 ℃ of temperature, carry out under vacuum degree 5 * 0.0004Pa condition obtaining the anode briquet behind the vacuum high-temperature sintering;
With the described anode briquet behind the sintering, in the salpeter solution of 0.1-0.5%, adopt the direct voltage of 12-60V, the current density of 60～100 milliamperes/gram to carry out dielectric layer formation on the surface of anode briquet;
B. with 3,4 vinyl monomer n-butanols and p-methyl benzenesulfonic acid ferrous solution close than compounding by 1: 4～6 quality and make mixed solution, the briquet that forms dielectric layer among the step a is immersed in the mixed solution of making, forms 3,4 ethene dioxythiophene PEDT layers as the macromolecule negative electrode at the briquet surface aggregate; Wherein, 3,4 vinyl monomer n-butanols be by 3,4 ethene dioxythiophenes of unimolecule attitude and n-butanol press 1: the 1-5 mass ratio mixes the mixture that forms.
In the reality, above-mentioned steps b is specifically undertaken by following step:
B1. according to ratio preparation 3, the 4 vinyl monomer n-butanols of mass ratio 1: 4～6 and the mixed solution of p-methyl benzenesulfonic acid ferrous solution;
B2. the briquet of the formation dielectric layer that obtains among the step a is immersed in to stop after 2～5 minutes in the mixed solution of step b1 preparation and takes out;
B3. the briquet polymerization at room temperature after will taking out 10～60 minutes, polymerization is 20 minutes under 50～150 ℃ of temperature;
B4. the briquet after the polymerization among the above-mentioned steps b3 is cleaned in the deionized water of 20～30 ℃ of temperature after 30 minutes and take out;
B5. under 120～150 ℃ of temperature, dried 10～30 minutes;
B6. use among the step a 50～70% direct voltage that the direct current of the 12-60V that uses when forming dielectric layer on anode briquet surface forms voltage as forming voltage, in mass ratio is 2～3% p-methyl benzenesulfonic acid solution, mend and form 20 minutes; Mending to form to handle to make the tantalum electrolytic capacitor of formation significantly reduce leakage current;
B7. after the benefit of step b6 forms, under 120～150 ℃ of temperature, dried once more 10～30 minutes;
Repeat above-mentioned steps b2～b7, form 3,4 ethene dioxythiophene PEDT layers of 0.2～0.3 millimeters thick as the macromolecule negative electrode up to the briquet surface that forms dielectric layer; In the reality, repeat 4～6 times above-mentioned steps b2～b7, can make 3,4 ethene dioxythiophene PEDT layer negative electrode reach 0.2～0.3 millimeter thickness;
C. briquet surface impregnation graphite, the silver slurry layer of polymerization formation macromolecule negative electrode are drawn layer as negative electrode, the tantalum wire lead-out wire and the negative electrode of described briquet are drawn on layer anode lead wire and cathode terminal of the metal framework that is bonded to encapsulating housing respectively, promptly obtain having the solid sheet type tantalum electrolyte capacitor of macromolecule negative electrode behind the plastic packaging;
In the reality, step c specifically comprises:
C1. in above-mentioned steps b the polymerization briquet surface impregnation solids content that forms the macromolecule negative electrode be behind 2～10% the graphite, in the oven dry 10～30 minutes down of 130～150 ℃ of temperature;
C2. flood conductive polymer silver slurry after, dried 10～30 minutes down for 150～200 ℃ in temperature;
C3. will flood the tantalum wire lead-out wire of the briquet behind the conductive polymer silver slurry, be bonded to encapsulating housing the anode lead wire of metal framework on, under 150 ℃ of temperature, dried 10～30 fens;
C4. use the mold apparatus of respective shell number that product is carried out the case pres-sure encapsulation, promptly obtain tantalum electrolytic capacitor.
In the reality, can adopt following step to carry out the manufacturing of polymer solid sheet type tantalum electrolyte capacitor, specifically comprise:
(1) anode forms: the tantalum powder that with specific volume is 7000uF.v/g is by suppressing the briquet that 6 milligrams/CC of density is pressed into the tantalum wire lead-out wire, and 1700 ℃ temperature, and vacuum degree is to carry out under 5 * 0.0004Pa condition obtaining the anode briquet behind the vacuum high-temperature sintering;
(2) dielectric layer forms: in 0.4% salpeter solution, the direct voltage of employing 60V forms dielectric layer as the surface of the current density anode briquet that sintering obtains in step (1) that forms voltage, 80 milliamperes/gram with electrochemical method, the thickness of the withstand voltage control medium layer that can set according to the capacitor of preparing to make, if it is thicker, the time that can control electrochemistry formation is longer, short, then the control time shorter get final product;
(3) negative electrode forms: according to 1: 5 ratio of mass ratio preparation 3, the mixed solution of 4 vinyl monomer n-butanols and p-methyl benzenesulfonic acid ferrous solution, wherein, 3,4 vinyl monomer n-butanols are the mixtures that mixed formation by 3,4 ethene dioxythiophenes of unimolecule attitude with 1: 3 the mass ratio that n-butanol is pressed;
(31) described briquet is immersed stop taking-up after 3 minutes in the described mixed solution;
(32) polyase 13 5 minutes at room temperature, polymerization is 20 minutes under 35 ℃ of temperature;
(33) briquet after the polymerization in the step (32) is cleaned taking-up after 30 minutes in the deionized water of 25 ℃ of temperature;
(34) under 135 ℃ of temperature, dried 20 minutes;
(35) use 60% the direct voltage of the direct voltage 60V of aforementioned formation dielectric layer (to be 60V * 60%=36V), in mass ratio is 2.5% p-methyl benzenesulfonic acid solution, to mend and form 20 minutes as forming voltage;
(36) under 135 ℃ of temperature, dried 20 minutes;
Generally repeat 4～6 times repeating step (3)～(36), forms 3,4 ethene dioxythiophene PEDT of 0.2～0.3 millimeters thick as negative electrode up to described anode briquet surface;
After the briquet surface impregnation solids content of polymerization formation negative electrode was 6% graphite, oven dry was 20 minutes under 150 ℃ of temperature;
Flood conductive polymer silver slurry afterwards, oven dry is 20 minutes under 180 ℃ of temperature;
Briquet behind the impregnated silver pulp is prescinded the anode tantalum wire, be bonded on the metal framework of encapsulating housing under 150 ℃ of temperature oven dry 20 minutes;
The shell number corresponding mold apparatus of use and encapsulating housing carries out the case pres-sure encapsulation to product, promptly obtains the tantalum electrolytic capacitor of macromolecule negative electrode.
On the basis of the above-mentioned macromolecule negative electrode tantalum electrolytic capacitor that makes, after can also carrying out subsequent treatment, obtain final macromolecule negative electrode solid sheet type tantalum electrolyte capacitor product, specifically comprise: (1) uses laser printer printed product specification and anodal sign; (2) use bar shear and bead cutter to cut away product framework coupling part and anode side; (3) use special-purpose aging equipment that product is applied the aging of enough time under the rated voltage; (4) use automatic test machine, product is carried out 100% performance test and rejects waste product simultaneously automatically according to corresponding testing standard; (5) the product lead-in wire is carried out standardized automatic moulding and braid, promptly obtain the finished product tantalum electrolytic capacitor that to check the back warehouse-in or directly use.
Above-mentioned production has in the solid sheet type tantalum electrolyte capacitor of macromolecule negative electrode, by adopting macromolecular material EDT monomer (3 of unimolecule attitude, the mixture of 4 ethene dioxythiophenes and n-butanol) and the mixed solution that is mixed with of the p-methyl benzenesulfonic acid iron of band conduction iron ion, make that polymerization forms polymeric coating layer as the macromolecule negative electrode on the tantalum anode briquet that forms dielectric layer, the high-frequency electrical conductance of this macromolecule negative electrode is 20S/cm, it is the higher polymeric coating layer of a kind of conductivity, material as height negative electrode, it not only will have lower resistivity, but also to have desirable commissure molecular structure and thickness just can reach requirement, chemical equivalent concentration ratio as the solution when the polymerization, relation is very big between the resistivity of polymerization temperature and speed and PEDT film and the leakage current of product, determined whether can make qualified solid sheet type tantalum electrolyte capacitor at last with macromolecule negative electrode, therefore adopt the chemical polymerization method among the utility model embodiment, can reach and be controlled at effectively that polymerization forms the purpose of the polymerization quality of PEDT layer on the outer dielectric layer of anode briquet, and then can make out leakage current and meet the requirements of solid sheet type tantalum electrolyte capacitor with low impedance at high frequency macromolecule negative electrode.
In sum, among the utility model embodiment with the tantalum piece as anode, polymerization forms 3,4 ethene dioxythiophene PEDT layers as negative electrode on tantalum piece anode, the encapsulation back forms the solid sheet type tantalum electrolyte capacitor with macromolecule negative electrode.Because 3,4 ethene dioxythiophene PEDT layer negative electrode have excellent low impedance at high frequency characteristic, make the high-frequency resistance of this tantalum electrolytic capacitor compare and to improve one to two order of magnitude with the tantalum electrolytic capacitor that with manganese dioxide is negative electrode, can be used in the higher circuit of frequency, can not cause the reduction of tantalum electrolytic capacitor capacity because of the raising of place channel frequency.And in that this tantalum electrolytic capacitor is unexpected when puncturing, can catching fire or blast, fail safe is higher.
The above; it only is the preferable embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (3)
1, a kind of polymer solid sheet type tantalum electrolyte capacitor is characterized in that, comprising:
In package casing, be provided with tantalum electric capacity particle, described tantalum electric capacity particle is made of tantalum piece anode, dielectric layer and the polymer cathode layer of band tantalum wire lead-out wire, tantalum piece anode coats dielectric layer outward, dielectric layer coats polymer cathode layer outward, the high-frequency electrical conductance of polymer cathode layer is 20S/cm, the tantalum wire lead-out wire of described tantalum piece anode is electrically connected with the anode lead wire of package casing, and polymer cathode layer is electrically connected with the cathode terminal of encapsulating housing.
2, tantalum electrolytic capacitor according to claim 1 is characterized in that, described polymer cathode layer is the clad structure layer that 3,4 ethene dioxythiophene PEDT materials form.
3, tantalum electrolytic capacitor according to claim 2 is characterized in that, the thickness of the clad structure layer that described 3,4 ethene dioxythiophene PEDT materials form is 0.2～0.3 millimeter.
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| Application Number | Priority Date | Filing Date | Title |
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| CNU2008201237391U CN201345299Y (en) | 2008-11-18 | 2008-11-18 | High polymer solid-chip type tantalum electrolytic capacitor |
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| CNU2008201237391U CN201345299Y (en) | 2008-11-18 | 2008-11-18 | High polymer solid-chip type tantalum electrolytic capacitor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270535A (en) * | 2011-05-13 | 2011-12-07 | 株洲宏达电子有限公司 | Method for manufacturing polymer ethylenedioxythiophene (PEDT) cathode plate type tantalum electrolytic capacitor by two-step method |
| CN109813185A (en) * | 2019-04-09 | 2019-05-28 | 湖南尚花科技有限公司 | Firecrackers and firecrackers structure |
-
2008
- 2008-11-18 CN CNU2008201237391U patent/CN201345299Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270535A (en) * | 2011-05-13 | 2011-12-07 | 株洲宏达电子有限公司 | Method for manufacturing polymer ethylenedioxythiophene (PEDT) cathode plate type tantalum electrolytic capacitor by two-step method |
| CN102270535B (en) * | 2011-05-13 | 2013-10-23 | 株洲宏达电子有限公司 | Method for manufacturing polymer ethylenedioxythiophene (PEDT) cathode plate type tantalum electrolytic capacitor by two-step method |
| CN109813185A (en) * | 2019-04-09 | 2019-05-28 | 湖南尚花科技有限公司 | Firecrackers and firecrackers structure |
| CN109813185B (en) * | 2019-04-09 | 2024-05-03 | 湖南尚花科技有限公司 | Firecracker and firecracker structure |
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