CN105304330A - Heat-resisting aluminum electrolytic capacitor and preparation method thereof - Google Patents
Heat-resisting aluminum electrolytic capacitor and preparation method thereof Download PDFInfo
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- CN105304330A CN105304330A CN201510745302.6A CN201510745302A CN105304330A CN 105304330 A CN105304330 A CN 105304330A CN 201510745302 A CN201510745302 A CN 201510745302A CN 105304330 A CN105304330 A CN 105304330A
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Abstract
The invention discloses a heat-resisting aluminum electrolytic capacitor and a preparation method thereof. The heat-resisting aluminum electrolytic capacitor comprises a capacitor housing and a capacitor core body, wherein the heat-resisting aluminum electrolytic capacitor is characterized in that the capacitor housing comprises an insulating layer and a radiating layer; the capacitor core body is tightly attached to the insulating layer; the insulating layer is a polyurethane film; the insulating layer is tightly attached to the radiating layer; the outer surface of the radiating layer is made of metal, and the interior of the radiating layer is filled with a radiating liquid. Compared with the prior art, the heat-resisting aluminum electrolytic capacitor disclosed by the invention can bear relatively high temperature; the withstand temperature can reach over 300 DEG C; meanwhile, the phenomena of cracking and aging caused by corrosion at high temperature are avoided; and the main capacitor core body is firm in structure, high in tensile strength, anti-fuse, anti-loose, shrinkage resistant, and not easy to deform, and has the advantages of being heat-resistant, environment-friendly, odorless, nontoxic, good in conductivity, low in electric leakage, low in loss, long in service lifetime and high in reliability.
Description
Technical field
The present invention relates to capacitor preparation field, specifically a kind of high temperature resistant aluminium electrolytic capacitor and preparation method.
Background technology
Along with electronic product is to slim, miniaturization, electronic circuit develops to multi-layer sheet, electronic devices and components also rapidly to miniaturized, surface mount manner is fast-developing, therefore chip components and parts comprise sheet type aluminum electrolytic and will further develop.The pasting type aluminium electrolytic capacitor of traditional applicable reflow soldering is with lead-out wire, inner foil and electrolytic paper are wound as cylinder-like structure and use adhesive tape to be bonded as one, plug and shell is used to encapsulate after impregnation is high temperature resistant electrolyte, and this type of aluminium electrolytic capacitor by higher Lead-free Reflow Soldering furnace temperature time, because high temperature action can cause the adhesive tape of winding core bag to melt fracture, inner core contracts out now loose, and adhesive tape such as to come off at the situation, cause electrical property deterioration, production reliability reduces.Traditional capacitor, its adhesive tape mainly uses the homogenous material such as polypropylene (PP) or polyphenylene sulfides (PPS) to obtain, as 3703F and the 320A product of Japanese Dong company, PP material heatproof is very poor, is mainly used in lead jointing and plug-in unit product, PPS there will be obviously contraction and base material deliquescing more than 200 degree, so be used on product, during by high-temp leadless Reflow Soldering, core bag can be there is loose, production reliability reduces, and adhesive tape such as to come off at the situation.Other high temperature gummed tapes known at present also have PET material and PI polyimides, although its theoretical heatproof can reach 300 DEG C, but the situation that reality just there will be softening stretching resistance decline at 200 DEG C, more seriously itself and GBL at high temperature have significant reaction, therefore there will be the bad phenomenon such as aging cracking, cause product reliability cannot meet design requirement.
Summary of the invention
The present invention aims to provide a kind of high temperature resistant aluminium electrolytic capacitor and preparation method.
For realizing described object, the invention provides following technical scheme:
A kind of high temperature resistant aluminium electrolytic capacitor and preparation method, comprise capacitor case and electric capacity core body, described capacitor case comprises insulating barrier and heat dissipating layer, described electric capacity core body and insulating barrier fit tightly, described insulating barrier is polyurethane film, insulating barrier and heat dissipating layer fit tightly, and described heat dissipating layer is outer surface is metal, and inside is filled with radiator liquid.
A kind of high temperature resistant aluminium electrolytic capacitor and preparation method, be included in anode block surface and prepare dielectric oxide film, electrolyte preparation, capacitor assembling, comprise the following steps:
(1) dielectric oxide film is prepared on anode block surface: anode tantalum block is immersed 70 ~ 90 DEG C, concentration expressed in percentage by volume is carry out first time electrochemical treatments in the phosphoric acid of 0.1 ~ 1%, the anode tantalum block of passing through first time electrochemical treatments is cleaned, dried, and putting into vacuum degree is 2x10
-3more than Torr, temperature are heat treatment 30 ~ 60 minutes in the vacuum furnace of 320 ~ 380 DEG C, by be placed in through heat treated anode tantalum block mass percent concentration be 38% sulfuric acid soak 30 minutes, again the anode tantalum block of soaking through persulfuric acid immersed that temperature is 160 ~ 180 DEG C, carry out second time electrochemical treatments 1 ~ 2 hour in the electrolyte that mixed by phosphoric acid and ethylene glycol, applying voltage is 1.1 ~ 1.4 times of rated capacitor voltage, anode tantalum block through second time electrochemical treatments is cleaned, dry for standby;
(2) electrolyte preparation: the sulfuric acid being more than 98% by deionized water and mass percent concentration is mixed with the aqueous sulfuric acid that mass concentration is 25%-38%, in described aqueous sulfuric acid, add the organically-modified solvent higher than 140 DEG C of boiling points of total amount 5%-15%, be mixed with mixed solution; While this organically-modified solvent of use, need the absolute ethyl alcohol adding its 1 ~ 2 times of volume used in combination, through sonic oscillation evenly obtained working electrolyte;
(3) capacitor assembling: described capacitor assembling comprises the following steps:
A, the capacitor anode pellet described surface being formed with dielectric oxide film impregnated in prepared working electrolyte solution, and dip time is 20min-60min, then takes out, and heavily fortified point is directly positioned in glass surface ware stand-by;
B, tantalum shell deionized water boiled and washes, after drying in 120 DEG C of environment, be vertically positioned on assembling frame, inject working electrolyte solution and flood 20min-60min under room temperature, then the electrolyte solution in cylinder is drawn clean, stand-by with pipettor;
C, gel electrolyte pipettor injected according to consumption impregnated of the tantalum shell of Working electrolyte, then polytetrafluoroethylene insulating washer on pad is being impregnated with bottom the anode pellet of Working electrolyte, it is vertically put into tantalum shell, namely obtains capacitor assembly;
D, by above-mentioned capacitor assembly through measuring after correlation performance parameters, after carrying out the operations such as slot rolling, laser sealing welding, the butt welding of plasma anode, namely make required electrolytic capacitor product.
Described cover plate adopts heat-dissipating cover plate, and is obtained by aluminum.
In described electrolyte, the concentration of volume percent of phosphoric acid is 1 ~ 15%, the concentration of volume percent of ethylene glycol solution is 50 ~ 70%, and all the other are water.
Compared with prior art, the invention has the beneficial effects as follows: high temperature resistant aluminium electrolytic capacitor of the present invention can bear higher temperature, heatproof can reach more than 300 DEG C, and avoiding at high temperature reacts with GBL is simultaneously dissoluted and causes the phenomenon of aging cracking to occur, battery core agent structure is fastening, tensile strength is high, anti-fusing, loosening, resisted shrinkage, not yielding, have high temperature resistant, environmental protection, odorless nontoxic, conduct electricity very well, Low dark curient, low-loss, the long-life, advantage that reliability is high.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Embodiment
Below in conjunction with the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
A kind of high temperature resistant aluminium electrolytic capacitor and preparation method, comprise capacitor case 2 and electric capacity core body 1, described electric capacity core body is connected to positive terminal 5 and negative terminal 6 by heart yearn 7, described capacitor case 2 comprises insulating barrier 4 and heat dissipating layer 3, described electric capacity core body 1 fits tightly with insulating barrier 4, and described insulating barrier 4 is polyurethane film, and insulating barrier 4 and heat dissipating layer 3 fit tightly, described heat dissipating layer 3 for outer surface be metal, inside is filled with radiator liquid.
A kind of high temperature resistant aluminium electrolytic capacitor and preparation method, be included in anode block surface and prepare dielectric oxide film, electrolyte preparation, capacitor assembling, comprise the following steps:
(1) dielectric oxide film is prepared on anode block surface: anode tantalum block is immersed 70 ~ 90 DEG C, concentration expressed in percentage by volume is carry out first time electrochemical treatments in the phosphoric acid of 0.1 ~ 1%, the anode tantalum block of passing through first time electrochemical treatments is cleaned, dried, and putting into vacuum degree is 2x10
-3more than Torr, temperature are heat treatment 30 ~ 60 minutes in the vacuum furnace of 320 ~ 380 DEG C, by be placed in through heat treated anode tantalum block mass percent concentration be 38% sulfuric acid soak 30 minutes, again the anode tantalum block of soaking through persulfuric acid immersed that temperature is 160 ~ 180 DEG C, carry out second time electrochemical treatments 1 ~ 2 hour in the electrolyte that mixed by phosphoric acid and ethylene glycol, applying voltage is 1.1 ~ 1.4 times of rated capacitor voltage, anode tantalum block through second time electrochemical treatments is cleaned, dry for standby;
(2) electrolyte preparation: the sulfuric acid being more than 98% by deionized water and mass percent concentration is mixed with the aqueous sulfuric acid that mass concentration is 25%-38%, in described aqueous sulfuric acid, add the organically-modified solvent higher than 140 DEG C of boiling points of total amount 5%-15%, be mixed with mixed solution; While this organically-modified solvent of use, need the absolute ethyl alcohol adding its 1 ~ 2 times of volume used in combination, through sonic oscillation evenly obtained working electrolyte;
(3) capacitor assembling: described capacitor assembling comprises the following steps:
A, the capacitor anode pellet described surface being formed with dielectric oxide film impregnated in prepared working electrolyte solution, and dip time is 20min-60min, then takes out, and heavily fortified point is directly positioned in glass surface ware stand-by;
B, tantalum shell deionized water boiled and washes, after drying in 120 DEG C of environment, be vertically positioned on assembling frame, inject working electrolyte solution and flood 20min-60min under room temperature, then the electrolyte solution in cylinder is drawn clean, stand-by with pipettor;
C, gel electrolyte pipettor injected according to consumption impregnated of the tantalum shell of Working electrolyte, then polytetrafluoroethylene insulating washer on pad is being impregnated with bottom the anode pellet of Working electrolyte, it is vertically put into tantalum shell, namely obtains capacitor assembly;
D, by above-mentioned capacitor assembly through measuring after correlation performance parameters, after carrying out the operations such as slot rolling, laser sealing welding, the butt welding of plasma anode, namely make required electrolytic capacitor product.
Described cover plate adopts heat-dissipating cover plate, and is obtained by aluminum.
In described electrolyte, the concentration of volume percent of phosphoric acid is 1 ~ 15%, the concentration of volume percent of ethylene glycol solution is 50 ~ 70%, and all the other are water.
Claims (4)
1. a high temperature resistant aluminium electrolytic capacitor and preparation method, comprise capacitor case and electric capacity core body, it is characterized in that, described capacitor case comprises insulating barrier and heat dissipating layer, described electric capacity core body and insulating barrier fit tightly, and described insulating barrier is polyurethane film, and insulating barrier and heat dissipating layer fit tightly, described heat dissipating layer is outer surface is metal, and inside is filled with radiator liquid.
2. high temperature resistant aluminium electrolytic capacitor and a preparation method, is included in anode block surface and prepares dielectric oxide film, electrolyte preparation, capacitor assembling, it is characterized in that, comprise the following steps:
(1) dielectric oxide film is prepared on anode block surface: anode tantalum block is immersed 70 ~ 90 DEG C, concentration expressed in percentage by volume is carry out first time electrochemical treatments in the phosphoric acid of 0.1 ~ 1%, the anode tantalum block of passing through first time electrochemical treatments is cleaned, dried, and putting into vacuum degree is 2x10
-3more than Torr, temperature are heat treatment 30 ~ 60 minutes in the vacuum furnace of 320 ~ 380 DEG C, by be placed in through heat treated anode tantalum block mass percent concentration be 38% sulfuric acid soak 30 minutes, again the anode tantalum block of soaking through persulfuric acid immersed that temperature is 160 ~ 180 DEG C, carry out second time electrochemical treatments 1 ~ 2 hour in the electrolyte that mixed by phosphoric acid and ethylene glycol, applying voltage is 1.1 ~ 1.4 times of rated capacitor voltage, anode tantalum block through second time electrochemical treatments is cleaned, dry for standby;
(2) electrolyte preparation: the sulfuric acid being more than 98% by deionized water and mass percent concentration is mixed with the aqueous sulfuric acid that mass concentration is 25%-38%, in described aqueous sulfuric acid, add the organically-modified solvent higher than 140 DEG C of boiling points of total amount 5%-15%, be mixed with mixed solution; While this organically-modified solvent of use, need the absolute ethyl alcohol adding its 1 ~ 2 times of volume used in combination, through sonic oscillation evenly obtained working electrolyte;
(3) capacitor assembling: described capacitor assembling comprises the following steps:
A, the capacitor anode pellet described surface being formed with dielectric oxide film impregnated in prepared working electrolyte solution, and dip time is 20min-60min, then takes out, and heavily fortified point is directly positioned in glass surface ware stand-by;
B, tantalum shell deionized water boiled and washes, after drying in 120 DEG C of environment, be vertically positioned on assembling frame, inject working electrolyte solution and flood 20min-60min under room temperature, then the electrolyte solution in cylinder is drawn clean, stand-by with pipettor;
C, gel electrolyte pipettor injected according to consumption impregnated of the tantalum shell of Working electrolyte, then polytetrafluoroethylene insulating washer on pad is being impregnated with bottom the anode pellet of Working electrolyte, it is vertically put into tantalum shell, namely obtains capacitor assembly;
D, by above-mentioned capacitor assembly through measuring after correlation performance parameters, after carrying out the operations such as slot rolling, laser sealing welding, the butt welding of plasma anode, namely make required electrolytic capacitor product.
3. the high temperature resistant aluminium electrolytic capacitor of one according to claim 1 and preparation method, is characterized in that: described cover plate adopts heat-dissipating cover plate, and is obtained by aluminum.
4. the high temperature resistant aluminium electrolytic capacitor of one according to claim 2 and preparation method, is characterized in that: in described electrolyte, the concentration of volume percent of phosphoric acid is 1 ~ 15%, the concentration of volume percent of ethylene glycol solution is 50 ~ 70%, and all the other are water.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040243183A1 (en) * | 2003-05-30 | 2004-12-02 | Norton John D. | Wet tantalum capacitor usable without reformation and medical devices for use therewith |
| CN103325570A (en) * | 2013-07-03 | 2013-09-25 | 中国振华（集团）新云电子元器件有限责任公司 | Preparation method of high temperature resistant capacitor |
| CN103824696A (en) * | 2014-02-09 | 2014-05-28 | 苏州萃智新技术开发有限公司 | Heat-radiation aluminium electrolytic capacitor |
| CN104465097A (en) * | 2014-11-19 | 2015-03-25 | 贵州中航聚电科技有限公司 | Method for manufacturing high-temperature-resistant high-reliability electrolytic capacitor |
-
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- 2015-11-03 CN CN201510745302.6A patent/CN105304330A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040243183A1 (en) * | 2003-05-30 | 2004-12-02 | Norton John D. | Wet tantalum capacitor usable without reformation and medical devices for use therewith |
| CN103325570A (en) * | 2013-07-03 | 2013-09-25 | 中国振华（集团）新云电子元器件有限责任公司 | Preparation method of high temperature resistant capacitor |
| CN103824696A (en) * | 2014-02-09 | 2014-05-28 | 苏州萃智新技术开发有限公司 | Heat-radiation aluminium electrolytic capacitor |
| CN104465097A (en) * | 2014-11-19 | 2015-03-25 | 贵州中航聚电科技有限公司 | Method for manufacturing high-temperature-resistant high-reliability electrolytic capacitor |
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