CN112216516A - Method for manufacturing anode block of electrolytic capacitor - Google Patents
Method for manufacturing anode block of electrolytic capacitor Download PDFInfo
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- CN112216516A CN112216516A CN202011089199.1A CN202011089199A CN112216516A CN 112216516 A CN112216516 A CN 112216516A CN 202011089199 A CN202011089199 A CN 202011089199A CN 112216516 A CN112216516 A CN 112216516A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G13/00—Apparatus specially adapted for manufacturing capacitors; Processes specially adapted for manufacturing capacitors not provided for in groups H01G4/00 - H01G11/00
- H01G13/006—Apparatus or processes for applying terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
- H01G9/008—Terminals
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
- H01G9/0525—Powder therefor
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-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
- H01G2009/05—Electrodes or formation of dielectric layers thereon characterised by their structure consisting of tantalum, niobium, or sintered material; Combinations of such electrodes with solid semiconductive electrolytes, e.g. manganese dioxide
Abstract
A method for manufacturing anode block of electrolytic capacitor includes uniformly flowing tantalum powder into powder tank, inserting tantalum wire, vibrating powder tank, filling powder cavity with powder, tamping powder in it by longitudinal tamping head, press-forming by traditional forming method, making blank be uniform in internal compaction distribution, making powder contact with lead wire tightly, making blank be rough in surface, preventing internal pore from being blocked, not only keeping longitudinal forming current stable and enduring surge voltage and current impact, but also avoiding deformation caused by too much electrolyte absorbed by local part of longitudinal forming because of small compaction, furthermore, tamping columnar anode blank by tamping head, avoiding bending deformation after sintering, making whole anode blank be uniform in compaction, and solving problem of over-standard size caused by electrolyte absorbed by local loose anode, the capability of enduring voltage and current impact is obviously improved, and the product percent of pass is greatly improved.
Description
Technical Field
The invention belongs to the technical field of electrolytic capacitor manufacturing, and particularly relates to a manufacturing method for an electrolytic capacitor anode block.
Background
With the acceleration of digitalization, intellectualization and lightness of electronic product equipment, capacitors used in the electronic product equipment tend to be miniaturized, densified and large in capacity, and the volume efficiency of powder compression molding anode blocks is higher and higher, so that the uneven compression distribution in the compression process is more and more obvious. The traditional tantalum billet forming method comprises transverse forming, longitudinal forming, multi-surface forming and the like, wherein the transverse forming is more suitable for forming an anode billet with a smaller volume, the compaction distribution of a lower corner part under the same compaction condition is smaller, the missing corner is easy to cause, leads are generally loosened, the leakage current of a finished product is large, and particularly the capacity of resisting surge voltage and current impact is very low; the longitudinal forming is a forming method which uses more, and adopts a mode of simultaneously extruding and forming a longitudinal upper die and a longitudinal lower die, and the longitudinal forming is mainly characterized in that the structure strength of a press-formed anode blank is high, the leakage current of a finished product is small, and the surge impact resistance capability is strong. The multi-surface forming is a mode of simultaneously extruding and forming in transverse direction by more than four, the forming effect is greatly improved compared with the one-way transverse forming, the compaction distribution in the anode blank is more uniform, but the contact state of the powder particles and the lead is not as good as that of the longitudinal forming. However, the method using the longitudinal forming method has many problems, such as smooth surface, large deviation of tantalum wire, uneven compaction distribution, large bottom pressure, the top end, the middle end, and the minimum, which leads to the phenomenon of easy occurrence of middle hypertrophy after coating the cathode electrolyte. The phenomenon of uneven compaction has great influence on the performance of the capacitor, not only influences various performance parameters of the capacitor, but also has great influence on the stability and the reliability of the capacitor, has a key decision function on the improvement of the volume efficiency of the capacitor, and has larger and larger influence effect along with the increase of the specific volume of the tantalum powder.
The forming method and forming process of the anode block of the electrolytic capacitor formed by pressing powder particles, including the mixing and pressing of the powder particles and the sintering of the anode blank, have a vital effect on the performance of the capacitor. The traditional manufacturing method is generally a transverse extrusion method and a longitudinal extrusion method, and a multidirectional transverse extrusion method is recently developed. The transverse extrusion method is more suitable for forming the hexahedral anode blank with smaller volume, and has the outstanding characteristics of smaller compaction, no surface slip form, better surface state of the anode blank and no obvious damage to surface particles. However, due to the viscous damping effect of the powder, the contact part of the extrusion head is pressed more densely, and the farther part is pressed less densely, so that the powder particles at the lead position are not in close contact with the lead. The longitudinal molding has many advantages, and can mold cylindrical, hexahedral or other irregular anode blanks, but the up-and-down pressing mode still cannot solve the problem that the middle part is less compacted, and after the cathode electrolyte is coated, the waist part of the capacitor is easily enlarged, and the problem of many size out-of-tolerance is mainly caused. Therefore, how to solve this problem is a problem that tantalum and niobium capacitor manufacturers are in urgent need to solve.
Disclosure of Invention
In order to solve the technical problem, the invention provides a manufacturing method for an anode block of an electrolytic capacitor.
The invention is realized by the following technical scheme.
The invention provides a method for manufacturing an anode block of an electrolytic capacitor, which comprises the following steps:
mixing powder, namely mixing an adhesive and a solvent, uniformly stirring to form a mixture, putting the mixture into a solvent bottle with a spraying nozzle, pouring tantalum powder into a powder mixing box, opening the powder mixing box, stirring while bumping, and simultaneously opening the spraying nozzle to spray the mixture to fully mix the mixture and the tantalum powder;
secondly, forming, namely adding the mixed tantalum powder into a powder groove, starting a forming machine to enable the powder to be freely injected into a powder cavity, vibrating the powder cavity, inserting a lead into the powder cavity, tamping the powder in the powder cavity by using a tamping head parallel to the direction of the lead, finally extruding by using a pressure head of the forming machine, loosening the squeezing head after forming is finished, and putting the formed anode blank into a collecting box;
and step three, sintering, namely sintering the forming blank in the collecting box according to a conventional sintering process to finish the preparation of the anode block of the electrolytic capacitor.
Furthermore, the tamper head comprises a tamper plate and a tamper needle, and the tamper needle is vertically fixed on the tamper plate.
Furthermore, the needle rod of the tamper needle is made of alloy materials, the diameter of the needle rod is 0.1-2mm, and the length of the needle rod is consistent with that of a lead wire to be inserted.
Furthermore, the needle head of the tamper needle is of a cone structure with an arc-shaped top end, and the diameter of the conical surface of the tamper needle is larger than that of the needle rod.
Furthermore, the needle head of the tamper needle is of a cone structure with an arc-shaped top end, and the diameter of the conical surface of the tamper needle is less than three times of the diameter of the needle rod.
Furthermore, in the second step, when the powder in the powder cavity is tamped by the tamping head, the powder in the powder cavity is tamped by the tamping head for multiple times.
Further, the ramming plate is used for manufacturing cylindrical electrolytic capacitor anode blocks by using a circular ramming plate, and is used for manufacturing hexahedral electrolytic capacitor anode blocks by using a rectangular ramming plate.
Furthermore, the number of the tamper needles arranged on the tamper plate is 3-6.
Further, before the second step, the mixed tantalum powder is subjected to solvent volatilization and binder removal by using a conventional process.
The invention has the beneficial effects that: the method combines the advantages of longitudinal forming and transverse forming, can ensure that the internal compaction distribution of the anode blank is uniform, the powder particles are tightly contacted with the lead, the surface of the blank body is rough, and the internal pores are not blocked, not only can keep the stability of longitudinal forming current and the capability of resisting surge voltage and current impact, but also avoid the deformation caused by excessive electrolyte absorption due to small compaction at the local part of the longitudinal forming; in addition, the cylindrical anode blank tamped by the tamping head, particularly the slender anode blank, can avoid bending deformation after sintering, can ensure that the whole anode blank is uniformly compacted, has equivalent absorption rate when being coated with a cathode, solves the problem that the anode absorbs electrolyte because of local looseness to cause standard exceeding of the size, obviously improves the capacity of resisting voltage and current impact, and greatly improves the product qualification rate.
Drawings
FIG. 1 is a view of a finished core manufactured using a conventional method;
FIG. 2 is a diagram of a core manufactured using the method of the present invention.
Detailed Description
The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the described.
A method of manufacturing an anode block for an electrolytic capacitor comprising the steps of: mixing powder, namely mixing an adhesive and a solvent, uniformly stirring to form a mixture, putting the mixture into a solvent bottle with a spraying nozzle, pouring tantalum powder into a powder mixing box, opening the powder mixing box, stirring while bumping, and simultaneously opening the spraying nozzle to spray the mixture to fully mix the mixture and the tantalum powder; secondly, forming, namely adding the mixed tantalum powder into a powder groove, starting a forming machine to enable the powder to be freely injected into a powder cavity, vibrating the powder cavity, inserting a lead into the powder cavity, tamping the powder in the powder cavity by using a tamping head parallel to the direction of the lead, finally extruding by using a pressure head of the forming machine, loosening the squeezing head after forming is finished, and putting the formed anode blank into a collecting box; and step three, sintering, namely sintering the forming blank in the collecting box according to a conventional sintering process to finish the preparation of the anode block of the electrolytic capacitor.
Furthermore, the tamper head comprises a tamper plate and a tamper needle, and the tamper needle is vertically fixed on the tamper plate.
Furthermore, the needle rod of the tamper needle is made of alloy materials, the diameter of the needle rod is 0.1-2mm, and the length of the needle rod is consistent with that of a lead wire to be inserted.
Furthermore, the needle head of the tamper needle is of a cone structure with an arc-shaped top end, and the diameter of the conical surface of the tamper needle is larger than that of the needle rod.
Furthermore, the needle head of the tamper needle is of a cone structure with an arc-shaped top end, and the diameter of the conical surface of the tamper needle is less than three times of the diameter of the needle rod.
Furthermore, in the second step, when the powder in the powder cavity is tamped by the tamping head, the powder in the powder cavity is tamped by the tamping head for multiple times.
Further, the ramming plate is used for manufacturing cylindrical electrolytic capacitor anode blocks by using a circular ramming plate, and is used for manufacturing hexahedral electrolytic capacitor anode blocks by using a rectangular ramming plate.
Furthermore, the number of the tamper needles arranged on the tamper plate is 3-6.
Further, before the second step, the mixed tantalum powder is subjected to solvent volatilization and binder removal by using a conventional process.
The inventor is inspired by the traditional adobe forming method in long-term practice, and proposes a method of ramming and extruding forming. The method comprises the steps of uniformly flowing tantalum powder into a powder groove, inserting a tantalum wire, vibrating the powder groove, filling the powder cavity with the powder, tamping the powder inside by using a longitudinal tamping head, and performing extrusion molding by using a traditional transverse/longitudinal molding method. The uniformity of compaction distribution in the anode blank can be ensured, and the problem that the surface is smooth and the pores are blocked due to crushing of powder particles in the longitudinal forming process can be avoided. The forming method can be used for forming a columnar anode blank and can also be used for forming a hexahedral anode blank. In particular to the shaping of anode blanks with larger volume and larger height.
The tamper head comprises a cylindrical tamper head and a hexahedral tamper head, and can also be a universal tamper head. The rammer head comprises a rammer plate and a rammer needle, wherein the rammer plate is circular or rectangular and is respectively suitable for cylindrical forming and hexahedral forming, the rammer needle is welded or riveted into the welding plate, the needle rod of the rammer needle is made of stainless steel with high hardness or other pollution-free alloy materials, the diameter of the needle rod is 0.1-2mm, the length of the needle rod is equivalent to that of a lead, the needle head is a cone with an arc top end according to the size adjustment of an anode blank, the tip end of the cone is subjected to passivation treatment and is arc-shaped, the diameter of the conical surface is larger than that of the needle rod but not more than three times of the diameter of the needle rod.
At least three tamping needles are embedded on the tamping plate, and at most six tamping needles are embedded on the tamping plate.
The tamping times of the tamping needle are at least once and are set according to the shell size.
The tamper plate is controlled by a separate lifting rod and is not connected with the extrusion head.
The tamping method can be used for the longitudinal forming process and the transverse forming process. The cylindrical anode blank tamped by the tamping head, particularly the slender anode blank, can avoid bending deformation after sintering, can ensure that the whole anode blank is uniformly compacted, has equivalent absorptivity when being coated with a cathode, and solves the problem that the anode absorbs electrolyte due to local looseness to cause standard exceeding of the size. The capability of enduring voltage and current impact is obviously improved, and the product percent of pass is improved.
Example 1
The method comprises the steps of taking valve metal tantalum powder as an anode material, preparing a mixed solution of a certain adhesive and a certain solvent according to the amount of the tantalum powder, uniformly stirring, filling the mixed solution into a solvent bottle with a spraying nozzle, pouring the powder into a powder mixing box, starting the powder mixing box, stirring while bumping, simultaneously opening the spraying nozzle to spray the adhesive, and uniformly mixing the powder. And pouring the powder out of the powder mixing box, volatilizing the solvent in a clean and ventilated environment, and detecting that the powder flowability meets the requirement. Adding the uniformly mixed powder into a powder groove, starting a forming machine to enable the powder to be freely injected into a powder cavity, vibrating the powder cavity, and inserting a lead into a set position of the powder cavity; and starting the tamping assembly, tamping the powder in the powder cavity twice by using a tamping plate with three tamping heads, moving the tamping assembly away, extruding by using a pressure head of a longitudinal forming machine, loosening the extruding head after forming is finished, and enabling the anode blank to fall into a collecting box. The specific volume of the powder was 50000. mu.F.V/g, the diameter of the anode block was 6.3mm, the height was 22mm, and comparative drawings of the sintered core and the core pressed by the conventional method are shown in FIGS. 1 and 2. And a pressing mode of tamping and extruding combination is adopted, so that the phenomenon that the tantalum core is bent after sintering is effectively solved.
Example 2
The powder was mixed in the same manner as in example 1, and an anode block was formed by tamping in the longitudinal direction to a size of 11.6X 3.6X 8.2 and a specific volume of 50000. mu.F.V/g, and sintering, formation, cathode coating and encapsulation were carried out in accordance with a conventional method. The performance parameters and the failure rate after surge voltage and current of the finished capacitor are shown in table 1.
TABLE 1 comparison of the mean values of the Performance parameters
As can be seen from the table above, the performance parameters of the capacitor manufactured by the method of the invention are obviously improved.
Claims (9)
1. A method for manufacturing an anode block for an electrolytic capacitor, characterized by comprising the steps of:
mixing powder, namely mixing an adhesive and a solvent, uniformly stirring to form a mixture, putting the mixture into a solvent bottle with a spraying nozzle, pouring tantalum powder into a powder mixing box, opening the powder mixing box, stirring while bumping, and simultaneously opening the spraying nozzle to spray the mixture to fully mix the mixture and the tantalum powder;
secondly, forming, namely adding the mixed tantalum powder into a powder groove, starting a forming machine to enable the powder to be freely injected into a powder cavity, vibrating the powder cavity, inserting a lead into the powder cavity, tamping the powder in the powder cavity by using a tamping head parallel to the direction of the lead, finally extruding by using a pressure head of the forming machine, loosening the squeezing head after forming is finished, and putting the formed anode blank into a collecting box;
and step three, sintering, namely sintering the forming blank in the collecting box according to a conventional sintering process to finish the preparation of the anode block of the electrolytic capacitor.
2. The method for manufacturing an anode block for electrolytic capacitors as claimed in claim 1, wherein: the tamper head comprises a tamper plate and a tamper needle, and the tamper needle is vertically fixed on the tamper plate.
3. The method for manufacturing an anode block for electrolytic capacitors as claimed in claim 2, wherein: the needle rod of the tamper needle is made of alloy materials, the diameter of the needle rod is 0.1-2mm, and the length of the needle rod is consistent with that of a lead wire to be inserted.
4. The method for manufacturing an anode block for electrolytic capacitors as claimed in claim 2, wherein: the needle head of the tamper needle is of a cone structure with the top end in an arc shape, and the diameter of the conical surface of the tamper needle is larger than that of the needle rod.
5. The method of manufacturing an anode block for electrolytic capacitors as claimed in claim 14, wherein: the needle head of the tamper needle is of a cone structure with the top end in an arc shape, and the diameter of the conical surface of the tamper needle is smaller than three times of the diameter of the needle rod.
6. The method for manufacturing an anode block for electrolytic capacitors as claimed in claim 1, wherein: and in the second step, the powder in the powder cavity is tamped by the tamping head for a plurality of times.
7. The method for manufacturing an anode block for electrolytic capacitors as claimed in claim 2, wherein: the ramming plate is used for manufacturing the cylindrical electrolytic capacitor anode block by using a circular ramming plate, and is used for manufacturing the hexahedral electrolytic capacitor anode block by using a rectangular ramming plate.
8. The method for manufacturing an anode block for electrolytic capacitors as claimed in claim 2, wherein: the number of the tamping needles arranged on the tamping plate is 3-6.
9. The method for manufacturing an anode block for electrolytic capacitors as claimed in claim 1, wherein: before the second step, the mixed tantalum powder is subjected to solvent volatilization and binder removal by using a conventional process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011089199.1A CN112216516A (en) | 2020-10-13 | 2020-10-13 | Method for manufacturing anode block of electrolytic capacitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011089199.1A CN112216516A (en) | 2020-10-13 | 2020-10-13 | Method for manufacturing anode block of electrolytic capacitor |
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| CN112216516A true CN112216516A (en) | 2021-01-12 |
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| CN202011089199.1A Pending CN112216516A (en) | 2020-10-13 | 2020-10-13 | Method for manufacturing anode block of electrolytic capacitor |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005116589A (en) * | 2003-10-03 | 2005-04-28 | Oppc Co Ltd | Molding method and molding apparatus |
| CN101258572A (en) * | 2005-09-02 | 2008-09-03 | Avx有限公司 | Method of forming anode bodies for solid state capacitors |
| JP2010027839A (en) * | 2008-07-18 | 2010-02-04 | Nec Tokin Corp | Method and apparatus for manufacturing capacitor element |
| CN106449102A (en) * | 2015-08-04 | 2017-02-22 | Avx公司 | Multiple leadwires using carrier wire for low ESR electrolytic capacitors |
| CN107680809A (en) * | 2017-09-26 | 2018-02-09 | 中国振华（集团）新云电子元器件有限责任公司 | A kind of expelling method of adhesive in pole of solid electrolytic capacitor block |
| CN108475581A (en) * | 2016-01-18 | 2018-08-31 | 阿维科斯公司 | Solid electrolytic capacitor with improved leakage current |
| CN111295587A (en) * | 2017-09-21 | 2020-06-16 | 阿维科斯公司 | Electronic parts including metal components originating from collision-free mines and methods of forming the same |
-
2020
- 2020-10-13 CN CN202011089199.1A patent/CN112216516A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005116589A (en) * | 2003-10-03 | 2005-04-28 | Oppc Co Ltd | Molding method and molding apparatus |
| CN101258572A (en) * | 2005-09-02 | 2008-09-03 | Avx有限公司 | Method of forming anode bodies for solid state capacitors |
| JP2010027839A (en) * | 2008-07-18 | 2010-02-04 | Nec Tokin Corp | Method and apparatus for manufacturing capacitor element |
| CN106449102A (en) * | 2015-08-04 | 2017-02-22 | Avx公司 | Multiple leadwires using carrier wire for low ESR electrolytic capacitors |
| CN108475581A (en) * | 2016-01-18 | 2018-08-31 | 阿维科斯公司 | Solid electrolytic capacitor with improved leakage current |
| CN111295587A (en) * | 2017-09-21 | 2020-06-16 | 阿维科斯公司 | Electronic parts including metal components originating from collision-free mines and methods of forming the same |
| CN107680809A (en) * | 2017-09-26 | 2018-02-09 | 中国振华（集团）新云电子元器件有限责任公司 | A kind of expelling method of adhesive in pole of solid electrolytic capacitor block |
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Application publication date: 20210112 |
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