JP2000216062A - Electrolytic capacitor - Google Patents
Electrolytic capacitorInfo
- Publication number
- JP2000216062A JP2000216062A JP11012277A JP1227799A JP2000216062A JP 2000216062 A JP2000216062 A JP 2000216062A JP 11012277 A JP11012277 A JP 11012277A JP 1227799 A JP1227799 A JP 1227799A JP 2000216062 A JP2000216062 A JP 2000216062A
- Authority
- JP
- Japan
- Prior art keywords
- foil
- water
- chemical conversion
- cathode
- capacitor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 title claims abstract description 36
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 39
- 239000011888 foil Substances 0.000 claims abstract description 35
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 18
- 239000002904 solvent Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 18
- 239000008151 electrolyte solution Substances 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 19
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 abstract description 13
- 238000006703 hydration reaction Methods 0.000 abstract description 6
- 238000007739 conversion coating Methods 0.000 abstract 2
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 6
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 6
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 6
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 4
- 150000007524 organic acids Chemical class 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
- 239000001361 adipic acid Substances 0.000 description 3
- 235000011037 adipic acid Nutrition 0.000 description 3
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 3
- 150000003863 ammonium salts Chemical class 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 239000004327 boric acid Substances 0.000 description 3
- 150000007522 mineralic acids Chemical class 0.000 description 3
- 239000005711 Benzoic acid Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 235000010233 benzoic acid Nutrition 0.000 description 2
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- FLDCSPABIQBYKP-UHFFFAOYSA-N 5-chloro-1,2-dimethylbenzimidazole Chemical compound ClC1=CC=C2N(C)C(C)=NC2=C1 FLDCSPABIQBYKP-UHFFFAOYSA-N 0.000 description 1
- 239000001741 Ammonium adipate Substances 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 235000019293 ammonium adipate Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 235000006408 oxalic acid Nutrition 0.000 description 1
- ACVYVLVWPXVTIT-UHFFFAOYSA-N phosphinic acid Chemical compound O[PH2]=O ACVYVLVWPXVTIT-UHFFFAOYSA-N 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、化成皮膜を形成し
た陽極箔と対向陰極箔とをセパレータを介して巻回した
コンデンサ素子に電解液を含浸した電解コンデンサに関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic capacitor in which an electrolytic solution is impregnated in a capacitor element in which an anode foil having a chemical conversion film formed thereon and an opposite cathode foil are wound via a separator.
【０００２】[0002]
【従来の技術】化成皮膜を形成した陽極アルミニウム箔
と対向陰極アルミニウム箔とをセパレータを介して巻回
したコンデンサ素子に電解液を含浸し、有底筒状のケー
スに収納して封口したアルミニウム電解コンデンサは周
知である。2. Description of the Related Art An electrolytic solution is impregnated in a capacitor element in which an anode aluminum foil having a chemical conversion film formed thereon and an opposite cathode aluminum foil are wound via a separator, and the electrolytic solution is impregnated in a cylindrical case having a bottom and sealed. Capacitors are well known.
【０００３】近年、斯かる電解コンデンサにおいては低
インピーダンス化が求められており、それに対応して、
比電導度が高く、高温においても安定な電解液が求めら
れている。In recent years, such electrolytic capacitors have been required to have low impedance.
There is a demand for an electrolyte having a high specific conductivity and stable even at high temperatures.
【０００４】例えば１０５℃保証の電解コンデンサにお
いては、γ−ブチロラクトンを主溶媒とし、有機酸のア
ンモニウム塩等を主溶質としたものが用いられている。
しかし、この電解液は非常に高価である。For example, in an electrolytic capacitor guaranteed at 105 ° C., a capacitor containing γ-butyrolactone as a main solvent and an ammonium salt of an organic acid as a main solute is used.
However, this electrolyte is very expensive.
【０００５】一方、上記γ−ブチロラクトンを主溶媒と
した電解液に比べて比電導度は低いが、低コストの電解
液として、エチレングリコールを主溶媒とし、アジピン
酸、アゼライン酸、安息香酸等の有機酸やその塩、ある
いはホウ酸、リン酸等の無機酸やその塩を主溶質とした
ものも多用されている。On the other hand, although the specific conductivity is lower than that of the above-mentioned electrolyte using γ-butyrolactone as a main solvent, a low-cost electrolyte using ethylene glycol as a main solvent, adipic acid, azelaic acid, benzoic acid, etc. Organic acids and salts thereof, and inorganic acids such as boric acid and phosphoric acid and salts thereof as a main solute are also frequently used.
【０００６】[0006]
【発明が解決しようとする課題】エチレングリコールを
主溶媒とした電解液で比電導度の高いものを得るために
は、該電解液の溶媒に多量の水を添加すればよいことが
知られているが、コンデンサの使用温度が高くなるほ
ど、また溶媒に添加する水の量が多くなるほど、陰極ア
ルミニウム箔と水とが水和反応を起こしやすくなる。こ
の水和反応が起こると、水素ガスが発生して電解コンデ
ンサ内部の圧力が上昇する。電解コンデンサ内部圧力の
上昇は、最終的に電解コンデンサケース防爆弁の作動、
封口ゴムの飛び出し、電解液の漏出等の不具合を発生さ
せる。It has been known that in order to obtain an electrolytic solution containing ethylene glycol as a main solvent and having a high specific conductivity, a large amount of water should be added to the solvent of the electrolytic solution. However, as the operating temperature of the capacitor increases and the amount of water added to the solvent increases, the hydration reaction between the cathode aluminum foil and water tends to occur. When this hydration reaction occurs, hydrogen gas is generated and the pressure inside the electrolytic capacitor increases. The rise in the internal pressure of the electrolytic capacitor ultimately affects the operation of the
It causes problems such as popping out of the sealing rubber and leakage of the electrolyte.
【０００７】本発明は、エチレングリコールを主溶媒と
し、比電導度を高めるために多量の水を添加した電解液
を用いたアルミニウム電解コンデンサにおいて、陰極ア
ルミニウム箔と水との水和反応を抑制する技術を提供す
るものである。[0007] The present invention suppresses the hydration reaction between a cathode aluminum foil and water in an aluminum electrolytic capacitor using an electrolytic solution containing ethylene glycol as a main solvent and a large amount of water added to increase the specific conductivity. Offering technology.
【０００８】[0008]
【課題を解決するための手段】本発明による電解コンデ
ンサは、化成皮膜を形成した陽極箔と対向陰極箔とをセ
パレータを介して巻回したコンデンサ素子に電解液を含
浸した電解コンデンサにおいて、前記電解液には、溶媒
としてエチレングリコール及び水が含まれ、前記コンデ
ンサ素子の陰極箔は、化成皮膜を形成したアルミニウム
箔からなることを特徴とするものである。According to the present invention, there is provided an electrolytic capacitor in which an electrolytic solution is impregnated in a capacitor element in which an anode foil having a chemical conversion film formed thereon and an opposing cathode foil are wound via a separator. The liquid contains ethylene glycol and water as a solvent, and the cathode foil of the capacitor element is made of an aluminum foil having a chemical conversion film formed thereon.
【０００９】上記本発明の構成によれば、電解液の溶媒
としてエチレングリコール及び水を含むことにより、該
電解液の比電導度が高くなり、、陰極アルミニウム箔に
化成皮膜を形成することにより、該陰極箔と電解液中の
水との水和反応が抑制される。According to the structure of the present invention, by including ethylene glycol and water as a solvent for the electrolytic solution, the specific conductivity of the electrolytic solution is increased, and by forming a chemical conversion film on the cathode aluminum foil, The hydration reaction between the cathode foil and water in the electrolyte is suppressed.
【００１０】[0010]
【発明の実施の形態】本発明の一実施形態に従った電解
コンデンサは、化成皮膜を形成した陽極アルミニウム箔
と対向陰極アルミニウム箔とをセパレータを介して巻回
したコンデンサ素子に電解液を含浸したものであり、前
記電解液には、溶媒として３０〜７０重量％のエチレン
グリコール及び２０〜６０重量％の水が含まれ、溶質と
してアジピン酸、アゼライン酸、安息香酸等の有機酸や
その塩、あるいはホウ酸、リン酸等の無機酸やその塩が
含まれ、前記コンデンサ素子の陰極箔は、化成皮膜を形
成したアルミニウム箔からなる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In an electrolytic capacitor according to one embodiment of the present invention, an electrolytic solution is impregnated in a capacitor element in which an anode aluminum foil having a chemical conversion film formed thereon and an opposite cathode aluminum foil are wound via a separator. The electrolyte contains 30 to 70% by weight of ethylene glycol and 20 to 60% by weight of water as a solvent, and an organic acid such as adipic acid, azelaic acid, or benzoic acid, or a salt thereof as a solute. Alternatively, the capacitor element contains an inorganic acid such as boric acid or phosphoric acid or a salt thereof, and the cathode foil of the capacitor element is made of an aluminum foil having a chemical conversion film formed thereon.
【００１１】陰極アルミニウム箔に化成皮膜を形成する
際の化成液としては、シュウ酸、アジピン酸、アゼライ
ン酸、セバシン酸等の有機酸やそのアンモニウム塩の水
溶液、あるいはリン酸、次亜リン酸、ホウ酸等の無機酸
やそのアンモニウム塩の水溶液が用いられる。As a chemical conversion solution for forming a chemical conversion film on the cathode aluminum foil, an aqueous solution of an organic acid such as oxalic acid, adipic acid, azelaic acid or sebacic acid or an ammonium salt thereof, or phosphoric acid, hypophosphorous acid, An aqueous solution of an inorganic acid such as boric acid or an ammonium salt thereof is used.
【００１２】化成電圧は、陰極箔に化成皮膜が形成され
ることによる静電容量の低下を考慮して、４Ｖ以下とす
ることが望ましい。The formation voltage is desirably 4 V or less in consideration of a decrease in capacitance due to formation of a chemical conversion film on the cathode foil.
【００１３】ここで、電解液の成分組成、陰極箔の化成
状態等がそれぞれ異なる本発明実施例及び従来例のアル
ミニウム電解コンデンサ（定格電圧３５Ｖ、公称静電容
量１５００μＦ）を試作し、１０５℃×１０００時間の
高温負荷試験を行った。その結果を表１に示す。なお、
実施例１〜３における陰極箔の化成皮膜は、化成液とし
てアジピン酸アンモニウムの水溶液を用い、化成電圧３
Ｖにて形成した。また、各種電解液の比電導度は、２５
℃で測定した値である。Here, aluminum electrolytic capacitors (rated voltage: 35 V, nominal capacitance: 1500 μF) of the present invention and the conventional example, which are different from each other in the composition of the electrolytic solution, the formation state of the cathode foil, etc., were manufactured at 105 ° C. × A 1000 hour high temperature load test was performed. Table 1 shows the results. In addition,
The conversion films of the cathode foils in Examples 1 to 3 were prepared by using an aqueous solution of ammonium adipate as a conversion solution,
V. The specific conductivity of various electrolytes is 25
It is a value measured at ° C.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１を見ればわかるように、エチレングリ
コールを主溶媒とし、水を２０重量％含有する電解液を
用いた電解コンデンサで、陰極箔に化成皮膜を形成して
いない従来例１においては、陰極アルミニウム箔の水和
反応に起因する水素ガスの発生により、高温負荷試験の
開始から３００時間以内という比較的短時間で、防爆弁
の作動、電解液の漏出という外観不良に至っている。As can be seen from Table 1, in the conventional capacitor 1 using an electrolytic solution containing ethylene glycol as a main solvent and containing 20% by weight of water and having no chemical conversion film formed on the cathode foil, Due to the generation of hydrogen gas due to the hydration reaction of the cathode aluminum foil, the appearance of the explosion-proof valve was activated and the electrolyte leaked in a relatively short time within 300 hours from the start of the high-temperature load test.
【００１６】これに対して、エチレングリコールを主溶
媒とし、水を２０重量％以上含有する電解液を用いた電
解コンデンサで、陰極箔に化成皮膜を形成した実施例１
〜３においては、１０００時間の高温負荷試験を経ても
外観異常は発生せず、ｔａｎδ（損失角の正接）の変化
も非常に小さい。On the other hand, in Example 1, a conversion film was formed on a cathode foil with an electrolytic capacitor using an electrolytic solution containing ethylene glycol as a main solvent and water of 20% by weight or more.
In Nos. To 3, no abnormal appearance occurred even after a high-temperature load test for 1000 hours, and the change in tan δ (tangent of loss angle) was very small.
【００１７】特に、エチレングリコールを主溶媒とし、
水を４５重量％以上含有する電解液を用いた電解コンデ
ンサで、陰極箔に化成皮膜を形成した実施例２、３にお
いては、γ−ブチロラクトンを溶媒とした電解液を用い
た従来例２と比較しても電解液の比電導度が高く、高温
負荷試験によるｔａｎδの上昇も、従来例２に比べて抑
制されている。In particular, ethylene glycol is used as a main solvent,
In Examples 2 and 3 in which a chemical conversion film was formed on the cathode foil with an electrolytic capacitor using an electrolytic solution containing 45% by weight or more of water, a comparison was made with Conventional Example 2 using an electrolytic solution using γ-butyrolactone as a solvent. Even so, the specific conductivity of the electrolyte is high, and the increase in tan δ due to the high temperature load test is suppressed as compared with Conventional Example 2.
【００１８】[0018]
【発明の効果】本発明によれば、エチレングリコールを
主溶媒とする安価な電解液をベースにして、多量の水を
添加することにより該電解液の比電導度が高められ、電
解液に水を添加することによる陰極アルミニウムとの水
和反応も、該陰極箔に化成皮膜を形成することにより抑
制される。According to the present invention, based on an inexpensive electrolytic solution containing ethylene glycol as a main solvent, the specific conductivity of the electrolytic solution is increased by adding a large amount of water. Is also suppressed by forming a chemical conversion film on the cathode foil.
【００１９】斯くして、低インピーダンスで高温での使
用にも耐えられる電解コンデンサが、低コストで提供さ
れる。Thus, an electrolytic capacitor which has low impedance and can withstand use at high temperatures is provided at low cost.
Claims (3)
とをセパレータを介して巻回したコンデンサ素子に電解
液を含浸した電解コンデンサにおいて、 前記電解液には、溶媒としてエチレングリコール及び水
が含まれ、 前記コンデンサ素子の陰極箔は、化成皮膜を形成したア
ルミニウム箔からなることを特徴とする電解コンデン
サ。1. An electrolytic capacitor in which an electrolytic solution is impregnated in a capacitor element in which an anode foil having a chemical conversion film formed thereon and an opposing cathode foil are wound via a separator, wherein the electrolytic solution contains ethylene glycol and water as a solvent. An electrolytic capacitor, wherein the cathode foil of the capacitor element is made of an aluminum foil on which a chemical conversion film is formed.
％以上であることを特徴とする請求項１記載の電解コン
デンサ。2. The electrolytic capacitor according to claim 1, wherein the content of water in the electrolytic solution is 20% by weight or more.
下の化成電圧にて化成皮膜を形成したアルミニウム箔か
らなることを特徴とする請求項１または２記載の電解コ
ンデンサ。3. The electrolytic capacitor according to claim 1, wherein the cathode foil of the capacitor element is made of an aluminum foil having a chemical conversion film formed at a formation voltage of 4 V or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11012277A JP2000216062A (en) | 1999-01-20 | 1999-01-20 | Electrolytic capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11012277A JP2000216062A (en) | 1999-01-20 | 1999-01-20 | Electrolytic capacitor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000216062A true JP2000216062A (en) | 2000-08-04 |
Family
ID=11800882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11012277A Pending JP2000216062A (en) | 1999-01-20 | 1999-01-20 | Electrolytic capacitor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000216062A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117594358A (en) * | 2024-01-17 | 2024-02-23 | 西安稀有金属材料研究院有限公司 | Preparation method of anode foil based on aqueous slurry and aluminum electrolytic capacitor |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01319924A (en) * | 1988-06-22 | 1989-12-26 | Matsushita Electric Ind Co Ltd | Manufacture of aluminum cathode foil for electrolytic capacitor |
| JPH0281417A (en) * | 1988-09-16 | 1990-03-22 | Nichicon Corp | Electrolyte for driving electrolytic capacitor |
-
1999
- 1999-01-20 JP JP11012277A patent/JP2000216062A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01319924A (en) * | 1988-06-22 | 1989-12-26 | Matsushita Electric Ind Co Ltd | Manufacture of aluminum cathode foil for electrolytic capacitor |
| JPH0281417A (en) * | 1988-09-16 | 1990-03-22 | Nichicon Corp | Electrolyte for driving electrolytic capacitor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117594358A (en) * | 2024-01-17 | 2024-02-23 | 西安稀有金属材料研究院有限公司 | Preparation method of anode foil based on aqueous slurry and aluminum electrolytic capacitor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20040608 |