CN203367025U - Tantalum electrolytic capacitor - Google Patents
Tantalum electrolytic capacitor Download PDFInfo
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- CN203367025U CN203367025U CN 201320479710 CN201320479710U CN203367025U CN 203367025 U CN203367025 U CN 203367025U CN 201320479710 CN201320479710 CN 201320479710 CN 201320479710 U CN201320479710 U CN 201320479710U CN 203367025 U CN203367025 U CN 203367025U
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- manganese dioxide
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Abstract
The utility model provides a tantalum electrolytic capacitor which includes an epoxy resin packaging shell, and a capacitor substrate, an anode lead frame and a cathode lead frame which are arranged inside the epoxy resin packaging shell; the internal part of the capacitor substrate is a tantalum anode, and the surface of the capacitor substrate is a manganese dioxide cathode; a dielectric layer is arranged between the tantalum anode and the manganese dioxide cathode; the tantalum anode is internally provided with a tantalum anode outgoing line which is electrically connected with the anode lead frame; the manganese dioxide cathode and the cathode lead frame are electrically connected; and the surface of the manganese dioxide cathode is sequentially coated with a water graphite layer, a manganese dioxide layer and an oily graphite layer. According to the embodiment of the utility model, the electrical properties of the product can be substantially improved; the qualification rate and reliability of the product are greatly improved; and the tantalum electrolytic capacitor is especially suitable for manufacture of the small middle-low voltage product below 16V.
Description
Technical field
The utility model relates to field of electronic components manufacturing, relates in particular to a kind of tantalum electrolytic capacitor.
Background technology
The manufacturing process complexity of tantalum electrolytic capacitor, operation is many, and long flow path easily causes the mechanical damage of product in production process.Especially the present requirement along with the electronic circuit miniaturization, volume requirement to the tantalum electrolytic capacitor of same capability and voltage is more and more less, this just requires the tantalum powder specific volume of tantalum capacitor application more and more higher, pressed density is also wanted corresponding increase, be subject to the restriction of tantalum powder flash over voltage, the technical difficulty of withstand voltage and reliability is increasing.Density due to tantalum piece itself is large in addition, and space is little, also poor by the coating solution permeability, and this just causes interiors of products to have a lot of slight void not particles filled by manganese dioxide, is easy to the moisture in absorbed air.Therefore, when product is used traditional watersoluble plumbago dipping, the easy adsorption moisture of product, surface shows that loss is normal.But at wicking, be evaporated out because of the moisture in the product body while sealing curing etc. being heated, so loss and ESR are larger.In addition, in the product storage process, loss and ESR can increase, and leakage current increases, even short circuit.Some high-grade, precision and advanced tantalum capacitors especially the storage time short, do not reach the effect of anticipation.
Summary of the invention
The purpose of this utility model is to provide a kind of tantalum electrolytic capacitor, improves the product electrical property, improves conforming product rate and reliability.
The purpose of this utility model is achieved through the following technical solutions:
A kind of tantalum electrolytic capacitor comprises: epoxy encapsulation shell, and the capacitor matrix, positive wire frame and the negative wire frame that are arranged on the epoxy encapsulation enclosure;
Capacitor matrix inside is tantalum anode, and surface is manganese dioxide cathodes, between tantalum anode and manganese dioxide cathodes, is provided with dielectric layer; Be provided with the tantalum wire anode lead wire in described tantalum anode, be electrically connected to described positive wire frame; Described manganese dioxide cathodes is electrically connected to the negative wire frame;
The surface of described manganese dioxide cathodes also is coated with watersoluble plumbago, manganese dioxide layer and one deck oiliness graphite.
Wherein, described dielectric layer is specially tantalum pentoxide.
Wherein, described oiliness graphite also is coated with silver slurry layer outward.
Compared with prior art, the utility model embodiment has following beneficial effect: the utility model embodiment can obviously improve the product electrical property, has greatly improved conforming product rate and reliability, the especially applicable following mesolow small sized product of 16v of manufacturing.
The accompanying drawing explanation
Fig. 1 is the cutaway view of the tantalum electrolytic capacitor that provides of the utility model embodiment.
Fig. 2 is the tunicle graphite silver slurry refinement figure of the tantalum electrolytic capacitor that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
Refer to shown in Fig. 1, in the present embodiment, tantalum electrolytic capacitor comprises: epoxy encapsulation shell 1, and the capacitor matrix, positive wire frame 2 and the negative wire frame 3 that are arranged on epoxy encapsulation shell 1 inside.
Capacitor matrix inside is tantalum anode 4, and the manganese dioxide cathodes 5 of surface for generating by the manganese nitrate pyrolysis, also be provided with the dielectric layer tantalum pentoxide 6 that utilizes electrochemical principle to be formed on the tantalum anode particle surface between tantalum anode 4 and manganese dioxide cathodes 5.
Be provided with tantalum wire anode lead wire 7 in tantalum anode 4, be electrically connected to positive wire frame 2; Manganese dioxide cathodes 5 is electrically connected to negative wire frame 3.
The surface of manganese dioxide cathodes 5 also is coated with watersoluble plumbago 8, manganese dioxide layer 9 and one deck oiliness graphite 10, replaces original watersoluble plumbago, to improve the humidity resistance of product.Also has silver slurry layer 11 outside oiliness graphite 10.
Refer to Fig. 2, in the present embodiment, tantalum electrolytic capacitor is on the basis of conventional graphite silver slurry technology, and last one deck watersoluble plumbago replaces with oiliness graphite.Concrete steps are: the tantalum piece that sintering completes through the group frame, energize, after the common process flow process such as tunicle, product flooded to the ground floor watersoluble plumbago; After oven dry, the dipping proportion manganese nitrate solution that is 1.15 1 minute, pyrolysis then, at watersoluble plumbago layer surface attachment one deck manganese dioxide; The oiliness graphite that dipping configures is also dried; Last one deck impregnated silver pulp, increase conductivity.
In above-mentioned steps, the product that has flooded oiliness graphite will dry 10-30 minute at normal temperatures, observes surface drying, then product is pushed in the baking oven of 120-180 degree and dries 20-60 minute.Oiliness graphite diluent that will be special-purpose with it before the use of oiliness graphite, in the ratio proportioning of 1:1 to 1:5, improves the wettability of product and graphite.
For the product reliability of convenient contrast traditional structure with improve the product reliability of structure, the product that this example will be organized frame simultaneously, energizes, tunicle completes divides two groups to test explanation.
First group: dipping adopts conventional graphite silver slurry technology, that is: at first the product that tunicle completes floods watersoluble plumbago one time, dries oven dry; Then the manganese nitrate solution that to flood proportion be 1.15 1 minute, pyrolysis, at watersoluble plumbago layer surface attachment one deck manganese dioxide; And then soak watersoluble plumbago one time, dry oven dry; Last one deck impregnated silver pulp, increase conductivity.
Second group: dipping adopts and improves graphite silver slurry technology, that is: at first the product that tunicle completes floods watersoluble plumbago one time, dries oven dry; Then the manganese nitrate solution that to flood proportion be 1.15 1 minute, pyrolysis, at watersoluble plumbago layer surface attachment one deck manganese dioxide; Then soak the good oiliness graphite of configured in advance one time, dry oven dry; Last one deck impregnated silver pulp, increase conductivity.
Above experiment is finished afterwards and the Data Comparison of normal product can obtain, and improved product leakage current numerical value after Reflow Soldering is substantially suitable with raw value, and the product that traditional handicraft is done leakage current major part after Reflow Soldering all significantly increases.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. a tantalum electrolytic capacitor, is characterized in that, comprising: epoxy encapsulation shell, and the capacitor matrix, positive wire frame and the negative wire frame that are arranged on the epoxy encapsulation enclosure;
Capacitor matrix inside is tantalum anode, and surface is manganese dioxide cathodes, between tantalum anode and manganese dioxide cathodes, is provided with dielectric layer; Be provided with the tantalum wire anode lead wire in described tantalum anode, be electrically connected to described positive wire frame; Described manganese dioxide cathodes is electrically connected to the negative wire frame;
The surface of described manganese dioxide cathodes also is coated with one deck watersoluble plumbago, one deck manganese dioxide layer and one deck oiliness graphite successively.
2. tantalum electrolytic capacitor as claimed in claim 1, is characterized in that, described dielectric layer is specially tantalum pentoxide.
3. tantalum electrolytic capacitor as claimed in claim 2, is characterized in that, described oiliness graphite also is coated with silver slurry layer outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320479710 CN203367025U (en) | 2013-08-07 | 2013-08-07 | Tantalum electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320479710 CN203367025U (en) | 2013-08-07 | 2013-08-07 | Tantalum electrolytic capacitor |
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| CN203367025U true CN203367025U (en) | 2013-12-25 |
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| CN 201320479710 Expired - Fee Related CN203367025U (en) | 2013-08-07 | 2013-08-07 | Tantalum electrolytic capacitor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105828476A (en) * | 2016-03-31 | 2016-08-03 | 中山市高乐电子科技有限公司 | LED driving power supply with good heat dissipation |
| CN105915071A (en) * | 2016-03-31 | 2016-08-31 | 中山市高乐电子科技有限公司 | Rectification filter with compact structure |
| CN115394559A (en) * | 2022-09-23 | 2022-11-25 | 中国振华(集团)新云电子元器件有限责任公司(国营第四三二六厂) | Method for reducing ESR (equivalent series resistance) of graphite silver paste process of solid electrolyte sheet type tantalum capacitor |
-
2013
- 2013-08-07 CN CN 201320479710 patent/CN203367025U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105828476A (en) * | 2016-03-31 | 2016-08-03 | 中山市高乐电子科技有限公司 | LED driving power supply with good heat dissipation |
| CN105915071A (en) * | 2016-03-31 | 2016-08-31 | 中山市高乐电子科技有限公司 | Rectification filter with compact structure |
| CN115394559A (en) * | 2022-09-23 | 2022-11-25 | 中国振华(集团)新云电子元器件有限责任公司(国营第四三二六厂) | Method for reducing ESR (equivalent series resistance) of graphite silver paste process of solid electrolyte sheet type tantalum capacitor |
| CN115394559B (en) * | 2022-09-23 | 2023-06-20 | 中国振华(集团)新云电子元器件有限责任公司(国营第四三二六厂) | Method for reducing ESR (equivalent series resistance) of graphite silver paste process of solid electrolyte sheet type tantalum capacitor |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131225 Termination date: 20160807 |
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| CF01 | Termination of patent right due to non-payment of annual fee |