CN103630788A - Detecting method of solid electrolytic capacitor - Google Patents
Detecting method of solid electrolytic capacitor Download PDFInfo
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- CN103630788A CN103630788A CN201310695425.4A CN201310695425A CN103630788A CN 103630788 A CN103630788 A CN 103630788A CN 201310695425 A CN201310695425 A CN 201310695425A CN 103630788 A CN103630788 A CN 103630788A
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Abstract
The invention discloses a detecting method of a solid electrolytic capacitor. The detecting method comprises the following steps: (1), immersing the aged solid electrolytic capacitor in heat carrier liquid with a temperature of 240 DEG C-270 DEG C, getting out and naturally cooling to 20 DEG C-25 DEG C after immersing for 10 seconds-30 seconds; and (2), carrying out 100% electrical inspection after cleaning and drying the solid electrolytic capacitor treated in the step (1). After the product is aged, the detecting method disclosed by the invention is added, and electrical inspection is carried out, so that not only can products with insufficient thermal stress resistance in the products be rejected, reliability of products be improved on the premise of not damaging the products, but also volume production can be adapted, efficiency can be high and product electrodes cannot be damaged.
Description
Technical field
The present invention relates to the detection method of electrolytic condenser, particularly relate to a kind of detection method of solid electrolytic capacitor.
Background technology
Owing to being subject to manufacturing the impact of solid electrolytic capacitor (as tantalum capacitor, niobium capacitor etc.) material purity, can not guarantee that all finished product capacitors have desirable, flawless deielectric-coating.When resin-encapsulated, encapsulating resin can cause certain impact to product fuse, can make properties of product deteriorated during contraction.These are hidden in the defect on media coating, when ageing (aging), cannot be repaired completely, when final electrical inspection, cannot effectively reject.Portioned product is after Reflow Soldering, and fuse is subject to Thermal Stress, and electrical property there will be deterioration, leakage current characteristic particularly, and failure rate increases.Such product is prone in use and punctures, burns phenomenon.
In order to reduce the impact on properties of product of the thermal stress that produces because of Reflow Soldering, need sampling to carry out Reflow Soldering test to product, traditional test method is directly put into reflow soldering by sampling product or is mounted and on printed-wiring board (PWB), carries out Reflow Soldering again, the former easily causes product anodizing, and because the inequality of being heated is unfavorable for potential defective products all to reject, the latter belongs to destructive test, is unfavorable for batch production.
Summary of the invention
Technical matters to be solved by this invention is: make up above-mentioned the deficiencies in the prior art, propose a kind of detection method of solid electrolytic capacitor, can reject defective products potential in production run, can effectively improve the reliability of product.
Technical matters of the present invention is solved by following technical scheme:
A detection method for solid electrolytic capacitor, comprises the steps:
(1) solid electrolytic capacitor of ageing being immersed in to temperature is in the thermal barrier liquid of 240～270 ℃, floods after taking out after 10～30s and naturally cools to 20-25 ℃;
(2) will after the solid electrolytic capacitor cleaning, drying of processing through step (1), carry out 100% electrical inspection.
Preferably, the open flash point of described thermal barrier liquid is not less than 200 ℃, and moisture is not more than 500mg/kg, and initial boiling point is not less than 240 ℃.
Preferably, described thermal barrier liquid is at least one in heat transfer oil, gas phase soldering fluid, ethers and ester class.
Preferably, described heat transfer oil is at least one in L-QB and L-QC.
Preferably, described heat transfer oil is L-QB280, or described heat transfer oil is the mixed liquor of L-QB280 and L-QB240, and in described mixed liquor, the mass ratio of described L-QB280 is not less than 50%.
Preferably, described gas phase soldering fluid is at least one in Galden HS260 and Galden HS240.
Preferably, described gas phase soldering fluid is Galden HS260, or the described gas phase soldering fluid mixed liquor that is Galden HS260 and Galden HS240, and in described mixed liquor, the mass ratio of described Galden HS260 is not less than 50%.
Preferably, in step (2), at least one in the weak acid class solution of employing ester class, alcohols and 6≤pH<7 cleaned.
Preferably, in step (2), described oven dry is at 80～120 ℃, to dry 10～30 minutes.
Preferably, described weak acid class solution is oxalic acid or acetic acid.
The beneficial effect that the present invention is compared with the prior art is: classic method is after product ageing, electrically to check, and in the present invention, product has increased detection method of the present invention and then has electrically checked after ageing, method of the present invention is not being destroyed under the prerequisite of product, the product of thermal stress deficiency in product not only can be rejected, improve the reliability of product, be applicable to again batch production, efficiency is high and can not destroy product electrode.
Embodiment
Below in conjunction with preferred embodiment the invention will be further described.
The invention provides a kind of detection method of solid electrolytic capacitor, in one embodiment, comprise the steps: that (1) is immersed in temperature by the solid electrolytic capacitor of ageing is in the thermal barrier liquid of 240～270 ℃, flood after taking out after 10～30s and naturally cool to 20-25 ℃; (2) will after the solid electrolytic capacitor cleaning, drying of processing through step (1), carry out 100% electrical inspection.
In some preferred embodiments: the open flash point of described thermal barrier liquid is not less than 200 ℃, and moisture is not more than 500mg/kg, initial boiling point is not less than 240 ℃.Described thermal barrier liquid can be at least one in heat transfer oil, gas phase soldering fluid, ethers and ester class.It is at least one in the heat transfer oil of L-QB and L-QC that described heat transfer oil can be selected the trade mark in GB.Further can select L-QB280 heat transfer oil, or the mixed liquor of L-QB280 and L-QB240, in mixed liquor, the mass ratio of described L-QB280 is not less than 50%.It is at least one in Galden HS260 and Galden HS240 that described gas phase soldering fluid can be selected marque.Further preferably, can select Galden HS260 gas phase soldering fluid, or can be the mixed liquor of Galden HS260 gas phase soldering fluid and Galden HS240 gas phase soldering fluid, in described mixed liquor, the mass ratio of GaldenHS260 be not less than 50%.In step (2), can adopt at least one in the weak acid class solution of ester class, alcohols and 6≤pH<7 to clean, wherein weak acid class solution is oxalic acid or acetic acid.In step (2), described oven dry is at 80～120 ℃, to dry 10～30 minutes.
Method of the present invention can be called 100% simulation Reflow Soldering test.The tantalum electric capacity of take below describes as example, concrete, can comprise the steps: first thermal barrier liquid to inject in container, be heated to 240～270 ℃, then the tantalum electric capacity of ageing be immersed in solution and seals this container, dip time is 10～30s, take out product, use ester class, alcohols or weak acid class after being cooled to 20-25 ℃, as oxalic acid, acetic acid equal solvent clean, after oven dry, carry out 100% electrical inspection, below by tabular form, each embodiment is described.
After product immersion test, electrode is oxidation stain not, and weldability, soldering resistance are good.Product is main badly shows that Capacitance Shift Rate is large, loss, equivalent series resistance, leakage current parameter value of being above standard (seeing the following form).
The product that exceeds standard value after processing is defective products, is rejected.
Above content is in conjunction with concrete preferred implementation further description made for the present invention, can not assert that specific embodiment of the invention is confined to these explanations.For those skilled in the art, without departing from the inventive concept of the premise, can also make some being equal to substitute or obvious modification, and performance or purposes identical, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. a detection method for solid electrolytic capacitor, is characterized in that, comprises the steps:
(1) solid electrolytic capacitor of ageing being immersed in to temperature is in the thermal barrier liquid of 240～270 ℃, floods after taking out after 10～30s and naturally cools to 20-25 ℃;
(2) will after the solid electrolytic capacitor cleaning, drying of processing through step (1), carry out 100% electrical inspection.
2. detection method as claimed in claim 1, is characterized in that: the open flash point of described thermal barrier liquid is not less than 200 ℃, and moisture is not more than 500mg/kg, and initial boiling point is not less than 240 ℃.
3. detection method as claimed in claim 1 or 2, is characterized in that: described thermal barrier liquid is at least one in heat transfer oil, gas phase soldering fluid, ethers and ester class.
4. detection method as claimed in claim 3, is characterized in that: described heat transfer oil is at least one in L-QB and L-QC.
5. detection method as claimed in claim 4, is characterized in that: described heat transfer oil is L-QB280, or described heat transfer oil is the mixed liquor of L-QB280 and L-QB240, and in described mixed liquor, the mass ratio of described L-QB280 is not less than 50%.
6. detection method as claimed in claim 3, is characterized in that: described gas phase soldering fluid is at least one in Galden HS260 and Galden HS240.
7. detection method as claimed in claim 6, it is characterized in that: described gas phase soldering fluid is Galden HS260, or the described gas phase soldering fluid mixed liquor that is Galden HS260 and Galden HS240, in described mixed liquor, the mass ratio of described Galden HS260 is not less than 50%.
8. detection method as claimed in claim 1 or 2, is characterized in that: in step (2), at least one in the weak acid class solution of employing ester class, alcohols and 6≤pH<7 cleaned.
9. detection method as claimed in claim 1 or 2, is characterized in that: in step (2), described oven dry is at 80～120 ℃, to dry 10～30 minutes.
10. detection method as claimed in claim 8, is characterized in that: described weak acid class solution is oxalic acid or acetic acid.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310695425.4A CN103630788B (en) | 2013-12-17 | 2013-12-17 | A kind of detection method of solid electrolytic capacitor |
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| CN201310695425.4A CN103630788B (en) | 2013-12-17 | 2013-12-17 | A kind of detection method of solid electrolytic capacitor |
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| CN103630788A true CN103630788A (en) | 2014-03-12 |
| CN103630788B CN103630788B (en) | 2016-03-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158596A (en) * | 2015-08-03 | 2015-12-16 | 河南鸿昌电子有限公司 | Acceptance check method for refrigeration parts after welding |
| CN115172064A (en) * | 2022-06-11 | 2022-10-11 | 益阳艾华富贤电子有限公司 | Method for improving reflow soldering convex colloidal particles of solid SMD type capacitor |
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| JP3712656B2 (en) * | 2001-10-24 | 2005-11-02 | シーケーディ株式会社 | Electrolytic capacitor aging device |
| CN101106023A (en) * | 2007-08-16 | 2008-01-16 | 南通江海电容器有限公司 | Solid electrolytic capacitor making process |
| CN101404213A (en) * | 2008-11-13 | 2009-04-08 | 北京七一八友益电子有限责任公司 | Solid sheet type tantalum electrolyte capacitor and its manufacturing method |
| CN102262191A (en) * | 2011-04-28 | 2011-11-30 | 北京航空航天大学 | Method for forecasting service life of solid tantalum electrolytic capacitor |
| CN203242502U (en) * | 2013-05-08 | 2013-10-16 | 佛山市三水日明电子有限公司 | Solid electrolyte aluminum electrolytic capacitor |
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2013
- 2013-12-17 CN CN201310695425.4A patent/CN103630788B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3712656B2 (en) * | 2001-10-24 | 2005-11-02 | シーケーディ株式会社 | Electrolytic capacitor aging device |
| CN101106023A (en) * | 2007-08-16 | 2008-01-16 | 南通江海电容器有限公司 | Solid electrolytic capacitor making process |
| CN101404213A (en) * | 2008-11-13 | 2009-04-08 | 北京七一八友益电子有限责任公司 | Solid sheet type tantalum electrolyte capacitor and its manufacturing method |
| CN102262191A (en) * | 2011-04-28 | 2011-11-30 | 北京航空航天大学 | Method for forecasting service life of solid tantalum electrolytic capacitor |
| CN203242502U (en) * | 2013-05-08 | 2013-10-16 | 佛山市三水日明电子有限公司 | Solid electrolyte aluminum electrolytic capacitor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158596A (en) * | 2015-08-03 | 2015-12-16 | 河南鸿昌电子有限公司 | Acceptance check method for refrigeration parts after welding |
| CN115172064A (en) * | 2022-06-11 | 2022-10-11 | 益阳艾华富贤电子有限公司 | Method for improving reflow soldering convex colloidal particles of solid SMD type capacitor |
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| CN103630788B (en) | 2016-03-09 |
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