JP4953043B2 - Electrolytic capacitor - Google Patents
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- JP4953043B2 JP4953043B2 JP2005105198A JP2005105198A JP4953043B2 JP 4953043 B2 JP4953043 B2 JP 4953043B2 JP 2005105198 A JP2005105198 A JP 2005105198A JP 2005105198 A JP2005105198 A JP 2005105198A JP 4953043 B2 JP4953043 B2 JP 4953043B2
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本発明は、各種電子機器に利用されるアルミ電解コンデンサに関するものである。 The present invention relates to an aluminum electrolytic capacitor used in various electronic devices.
電解コンデンサは、引出端子が接続され、アルミニウムなどの皮膜形成性金属箔の表面をエッチング処理され、その表面に酸化皮膜を形成した陽極箔と、同じく引出端子が接続され、アルミニウムなどの皮膜形成性金属箔よりなる陰極箔とを、両者の間に電気絶縁性の電解紙などからなるセパレータを介して巻回または積層してコンデンサ素子を構成し、このコンデンサ素子に駆動用電解液を含浸するとともに、アルミニウムよりなる有底筒状の外装ケースに収納して開口部をゴムや樹脂材からなる封口部材に封口したものが知られている。 The electrolytic capacitor is connected to the lead terminal, and the surface of the film-forming metal foil such as aluminum is etched, and the anode foil having the oxide film formed on the surface is connected to the lead terminal, and the film-forming property such as aluminum is formed. A cathode foil made of a metal foil is wound or laminated with a separator made of electrically insulating electrolytic paper between them to form a capacitor element, and this capacitor element is impregnated with a driving electrolyte. In addition, there is known one that is housed in a bottomed cylindrical outer case made of aluminum and has an opening sealed with a sealing member made of rubber or a resin material.
この様な電解コンデンサでは、電極箔に接続される引出端子や該引出端子と電極箔との接続部には角部が存在し、電極箔を巻回又は積層してコンデンサ素子を形成する際には、前記角部の接触によりセパレータが損傷し、さらには巻回又は積層時の応力により、セパレータを突き破って対向する電極箔と接触してショート不良を生じる可能性があった。この対策として、セパレータにおける引出端子と対応する部位に宛て紙を貼り付けたコンデンサ素子構造が提案されている（特許文献１）。これによると引出端子と対応するセパレータの部位が宛て紙により二重構造となり、セパレータの破れによるショート不良が防止される。 In such an electrolytic capacitor, there is a corner in the lead terminal connected to the electrode foil and the connection part between the lead terminal and the electrode foil, and the capacitor element is formed by winding or laminating the electrode foil. May damage the separator due to the contact of the corners, and may cause a short circuit defect due to the stress at the time of winding or stacking and breaking through the separator to contact the opposing electrode foil. As a countermeasure, there has been proposed a capacitor element structure in which paper is attached to a portion of the separator corresponding to the lead terminal (Patent Document 1). According to this, the separator portion corresponding to the lead-out terminal has a double structure by the addressed paper, and a short circuit failure due to the tearing of the separator is prevented.
しかしながら、各種装置の小形化、高性能化の要求が高まっており、電解コンデンサにも小形化、高性能化が求められている。特に近年、サーボモータの普及に伴いこのサーボモータの制御用に電解コンデンサが多く使用されるようになってきている。このサーボモータでは、電解コンデンサは主に低周波数領域で多く使用され、この低周波領域においては、電解コンデンサに数Ｈｚ〜数十Ｈｚの充放電が繰り返されることとなり、従来のセパレータに宛て紙を貼り付けた電解コンデンサでは、低周波領域でＥＳＲ特性が悪化するという問題があった。 However, there is an increasing demand for miniaturization and high performance of various devices, and electrolytic capacitors are also required to be small and high performance. Particularly in recent years, with the widespread use of servo motors, electrolytic capacitors have been increasingly used for controlling the servo motors. In this servo motor, electrolytic capacitors are often used mainly in the low frequency region. In this low frequency region, the electrolytic capacitor is repeatedly charged and discharged at several Hz to several tens Hz. The attached electrolytic capacitor has a problem that the ESR characteristic deteriorates in a low frequency region.
そこで、本発明は、上記の従来の問題を解消するために提案されたもので、電解コンデンサにおけるセパレータの破れによるショート不良を確実に防止できるとともに、低周波領域でのＥＳＲを改善して信頼性の高い電解コンデンサを提供することを目的としている。 Therefore, the present invention has been proposed to solve the above-described conventional problems, and can reliably prevent short-circuit failure due to separator breakage in an electrolytic capacitor and improve reliability by improving ESR in a low frequency region. The purpose is to provide a high electrolytic capacitor.
本発明者らは、セパレータに貼り付ける絶縁紙及び粘着材を調査し鋭意研究した結果、従来の電解コンデンサでは、宛て紙をセパレータに貼り付けるための粘着材成分がＥＳＲ特性を悪化させる要因であることをつきとめ、さらに研究を重ね、粘着材を構成する背面剥離材が駆動用電解液中のイオンの透過を阻害し、これにより電解コンデンサのＥＳＲ特性を低下させていることを見出した。 As a result of investigating and researching the insulating paper and the adhesive material to be attached to the separator, the adhesive material component for attaching the addressed paper to the separator is a factor that deteriorates the ESR characteristic in the conventional electrolytic capacitor. As a result, further research has been conducted, and it has been found that the back surface release material constituting the adhesive material inhibits the permeation of ions in the driving electrolyte solution, thereby reducing the ESR characteristics of the electrolytic capacitor.
そこで、本発明の電解コンデンサは、引出端子がそれぞれに接続された陰極箔と陽極箔との間にセパレータを介在したコンデンサ素子を備えた電解コンデンサにおいて、前記セパレータは、引出端子と対応する部位であって引出端子との間に、絶縁紙が粘着材を介して貼着されるとともに、その剥離強度が５〜３０ｇ／ｃｍ２であって、且つ前記粘着材は、陽極箔の面積に対して０．５％以上６％以下の面積であることを特徴としている。 Therefore, the electrolytic capacitor of the present invention is an electrolytic capacitor including a capacitor element in which a separator is interposed between a cathode foil and an anode foil each connected to a lead terminal, and the separator is a portion corresponding to the lead terminal. Insulating paper is stuck between the lead-out terminals via an adhesive material, and the peel strength thereof is 5 to 30 g / cm 2 , and the adhesive material is based on the area of the anode foil. The area is 0.5% or more and 6% or less.
これによると、絶縁紙に少ない塗布面積にて薄く粘着材を形成することで、電解液中のイオン透過の阻害が低減され、ＥＳＲ特性は大幅に改善された。特に低周波領域では、駆動用電解液中のイオンの移動量が大きいため、前記絶縁紙を通過するイオンも多くなり、従って絶縁紙への粘着材の形成構造を変えることで、前記駆動用電解液中のイオンを阻害することなく円滑に移動させることができ、低周波領域で良好なＥＳＲ特性が得られると考えられる。粘着材の面積は、陽極箔全体の面積に対して小さいほど好ましく、６％以下であれば良好な結果が得られ、３％〜０．５％が好適である。６％を越えると急激にＥＳＲ特性が悪化し、また０．５％を下回ると、セパレータへの絶縁紙の貼り付け強度が低下しコンデンサ素子の巻回又は積層時に絶縁紙のズレが生じやすい。 According to this, by forming a thin adhesive material on an insulating paper with a small coating area, the inhibition of ion permeation in the electrolytic solution was reduced, and the ESR characteristics were greatly improved. Especially in the low frequency region, the amount of ions moving in the driving electrolyte is large, so that more ions pass through the insulating paper. Therefore, by changing the formation structure of the adhesive material on the insulating paper, the driving electrolysis is changed. It is considered that ions in the liquid can be smoothly moved without being obstructed, and good ESR characteristics can be obtained in a low frequency region. The area of the pressure-sensitive adhesive material is preferably as small as possible with respect to the entire area of the anode foil. If the area is 6% or less, good results are obtained, and 3% to 0.5% is preferable. If it exceeds 6%, the ESR characteristics deteriorate rapidly, and if it is less than 0.5%, the strength of attaching the insulating paper to the separator is lowered, and the insulating paper is likely to be displaced during winding or lamination of the capacitor element.
また、前記粘着材は、他の基材の表面に貼り付けられ、この基材と絶縁紙を張り合わせて粘着材を絶縁紙の表面に転写することで絶縁紙の表面に粘着材を形成したことを特徴としている。 In addition, the adhesive material is attached to the surface of another base material, and the adhesive material is formed on the surface of the insulating paper by pasting the base material and the insulating paper and transferring the adhesive material to the surface of the insulating paper. It is characterized by.
また、前記粘着材は、絶縁紙の表面が線状、波線状、点状などのように間欠的に形成されていることを特徴としている。これによると、駆動用電解液中のイオン透過を阻害する領域が減少するとともに、セパレータへの絶縁紙の貼り付け強度を確保できるため好ましい。 The pressure-sensitive adhesive material is characterized in that the surface of the insulating paper is intermittently formed in a line shape, a wavy line shape, a dot shape, or the like. According to this, since the area | region which obstruct | occludes the ion permeation in a driving electrolyte solution reduces, and the affixing strength of the insulating paper to a separator can be ensured, it is preferable.
以上のように、本発明によれば、前記セパレータは、引出端子と対応する部位に絶縁紙が粘着材を介して貼着されるとともに、前記粘着材は陽極箔の箔面積に対して０．５％以上６％以下の面積とすることで、引出端子によるセパレータの損傷やショート不良を防止するとともに、前記粘着材の塗布量を制御することで、電解コンデンサの低周波領域におけるＥＳＲ特性を改善することができる。 As described above, according to the present invention, the separator has the insulating paper pasted on the portion corresponding to the lead terminal through the adhesive material, and the adhesive material has a thickness of 0. 0 relative to the foil area of the anode foil . By making the area 5% or more and 6% or less, the separator can be prevented from being damaged or short-circuited by the lead terminal, and the amount of the adhesive applied can be controlled to improve the ESR characteristics in the low frequency region of the electrolytic capacitor. can do.
この発明の実施の形態を図面に基づいて説明する。
図１に示すように、陽極側電極箔はアルミニウム等の弁作用金属からなり、エッチング処理により表面が粗面化されるとともに、その表面に酸化皮膜層が形成されている。陰極箔３は、陽極箔２と同様にアルミニウム等の弁作用金属からなり、エッチング処理により表面が粗面化されている。これら両極の電極には、アルミニウムからなる陽極側の引出端子４と、同じくアルミニウムからなる陰極側の引出端子５がそれぞれステッチ、コールドウェルド、超音波溶接等の接続手法により電気的に接続されている。この引出端子４、５は、電極箔に接続される偏平部と外部接続用の引出部を有するものや、帯状体から構成され一方が電極箔に接続され、他方が外部引き出し用の別途封口体に設けられた外部端子に接続されるものがある。
Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the anode-side electrode foil is made of a valve metal such as aluminum, and the surface is roughened by an etching process, and an oxide film layer is formed on the surface. The cathode foil 3 is made of a valve action metal such as aluminum like the anode foil 2, and the surface thereof is roughened by an etching process. The anode-side lead terminal 4 made of aluminum and the cathode-side lead terminal 5 made of aluminum are electrically connected to these bipolar electrodes, respectively, by a connection method such as stitching, cold welding, or ultrasonic welding. . The lead terminals 4 and 5 have a flat part connected to the electrode foil and a lead part for external connection, or are composed of strips, one of which is connected to the electrode foil and the other a separate sealing body for external lead. Some are connected to external terminals provided in the.
陰極箔３と陽極箔２の間に介在されるセパレータ６は電気絶縁性であり、マニラ麻紙、クラフト紙、エスパルト紙或いはこれらの混抄紙や、合成繊維や不織布あるいはこれらの混抄紙などからなる。巻回型のコンデンサ素子１では、それぞれ１以上の引出端子４、５が接続された陰極箔３及び陽極箔２を所定長さの帯状体から構成し、前記陰極箔３と陽極箔２の間にセパレータ６を介在して巻回して構成される。また、積層型のコンデンサ素子１では、それぞれ引出端子４、５が接続された陰極箔３及び陽極箔２を所定長さの平板状体から構成し、前記陰極箔３と陽極箔２とを間にセパレータ６を介在して交互に積み重ねて構成される。これらのコンデンサ素子１には駆動用電解液が含浸されるとともにアルミニウムなどからなる有底筒状の金属ケースに収納され、開口部が弾性体や、弾性体と硬質体との複合部材からなる封口体によって加締め封口される。 The separator 6 interposed between the cathode foil 3 and the anode foil 2 is electrically insulating, and is made of Manila hemp paper, kraft paper, esparto paper or a mixed paper thereof, synthetic fiber, non-woven fabric, or a mixed paper thereof. In the wound capacitor element 1, each of the cathode foil 3 and the anode foil 2 to which one or more lead terminals 4 and 5 are connected is constituted by a belt-like body having a predetermined length, and between the cathode foil 3 and the anode foil 2. It is constituted by winding the separator 6 between them. In the multilayer capacitor element 1, the cathode foil 3 and the anode foil 2 to which the lead terminals 4 and 5 are respectively connected are formed of a flat plate having a predetermined length, and the cathode foil 3 and the anode foil 2 are interposed between the cathode foil 3 and the anode foil 2. Are alternately stacked with separators 6 interposed therebetween. These capacitor elements 1 are impregnated with a driving electrolyte and housed in a bottomed cylindrical metal case made of aluminum or the like, and an opening is a sealing member made of an elastic body or a composite member of an elastic body and a hard body. Sealed by the body.
ここで、前記セパレータ６は、陽極箔２と陰極箔３に介在された際に各電極箔に接続された陽極側の引出端子４および／または陰極側の引出端子５に対応する部位に、絶縁紙７が粘着材を介して接続されている。絶縁紙７は、電気絶縁性であり、マニラ麻紙、クラフト紙、エスパルト紙、サイザル麻紙、ヘムプ紙、キュプラ、レーヨン、コットン或いはこれらの混抄紙より選択して用いられる１重紙のものや、低密度紙１０と高密度紙９の２重紙から構成され、それぞれ電気絶縁性であり、マニラ麻紙、クラフト紙、エスパルト紙、サイザル麻紙、ヘムプ紙、キュプラ、レーヨン、コットン或いはこれらの混抄紙より選択して用いられる２重紙などがあげられる。高密度紙９としては、主にクラフト紙、低密度紙１０としては、マニラ麻紙、エスパルト紙が好適に用いられる。本発明では、絶縁紙７を構成する高密度紙９の密度は、粘着材の塗布量を低減可能となる表面形状とするため０．６０ｇ／ｃｍ３以上が好ましく、低密度紙１０の密度は、前記高密度紙９の密度に対し低いものを適宜用いることができる。この絶縁紙７を貼り付ける粘着材は、フェノール系、エポキシ系、シアノアクリレート系、ポリイミド系、アクリル系、シリコーン系、ゴム系、あるいはホットメルト系などが挙げられる。なかでも、ポリプロピレンやポリビニルアルコールが好適に用いられる。この粘着材は、絶縁紙の表面に塗布などにより形成されるが、１重紙の場合は、表裏のうちより平坦側の面に粘着材が形成され、また２重紙の場合は、高密度紙側の面に粘着材が形成されることが好ましい。 Here, when the separator 6 is interposed between the anode foil 2 and the cathode foil 3, the separator 6 is insulated at a portion corresponding to the anode-side lead terminal 4 and / or the cathode-side lead terminal 5 connected to each electrode foil. Paper 7 is connected via an adhesive material. The insulating paper 7 is electrically insulative, and is a single paper that is selected from Manila hemp paper, kraft paper, esparto paper, sisal hemp paper, hemp paper, cupra, rayon, cotton, or a mixed paper thereof, or low Consists of double paper of density paper 10 and high-density paper 9, each of which is electrically insulating, selected from Manila hemp paper, kraft paper, esparto paper, sisal paper, hemp paper, cupra, rayon, cotton or mixed paper And double papers used in this way. As the high density paper 9, mainly kraft paper and as the low density paper 10, Manila hemp paper and esparto paper are preferably used. In the present invention, the density of the high-density paper 9 constituting the insulating paper 7 is preferably 0.60 g / cm 3 or more in order to obtain a surface shape that can reduce the coating amount of the adhesive material, and the density of the low-density paper 10 is A material having a density lower than that of the high-density paper 9 can be appropriately used. Examples of the adhesive material to which the insulating paper 7 is attached include phenol-based, epoxy-based, cyanoacrylate-based, polyimide-based, acrylic-based, silicone-based, rubber-based, and hot-melt-based materials. Of these, polypropylene and polyvinyl alcohol are preferably used. This adhesive is formed on the surface of the insulating paper by coating or the like. In the case of single paper, the adhesive is formed on the flat side of the front and back, and in the case of double paper, the density is high. It is preferable that an adhesive material is formed on the paper side surface.
この粘着材の絶縁紙７への形成方法としてはドクターブレード法が好ましい。具体的には、図３に示すように粘着材が入った槽１３の内に、回転ローラー１１を浸漬し、このローラーを回転することで、その表面に食刻により任意に設けられた凹部１４内に粘着材８が保持されて移送され、回転ローラー１１の一部に設けられたドクター刃１２により、余分な粘着材８を削ぎ落とし、粘着材８を適量として回転ローラー１１と弾性ローラー１５の間に絶縁紙７を通過させることで、絶縁紙７の平坦側の面に粘着材８を形成する。なお、前記回転ローラー１１と弾性ローラー１５との間に絶縁紙７の代わりに他の基材を通過させ、この基材の表面に粘着材８を貼り付け、この基材と絶縁紙７を張り合わせて、前記粘着材８を絶縁紙７の表面に転写させることもできる。前記回転ローラー１１の凹部１４により、絶縁紙７表面に形成される粘着材８は、間欠的に形成され、粘着材８の塗布量を低減できるとともに、電解液の絶縁紙７への浸透を良好とする。前記回転ローラー１１の表面の凹部１４を任意に形成することにより、絶縁紙７へ粘着材８を任意に形成できる。この絶縁紙７への粘着材８の形成形状は、図２の（ｂ）及び（ｃ）に示すように、線状、波線状、点状に形成できる。 As a method for forming the adhesive material on the insulating paper 7, a doctor blade method is preferable. Specifically, as shown in FIG. 3, a concave roller 14 is arbitrarily provided on the surface by etching by immersing the rotating roller 11 in a tank 13 containing an adhesive and rotating the roller. The adhesive material 8 is held and transferred inside, and the doctor blade 12 provided in a part of the rotating roller 11 scrapes off the excess adhesive material 8, and uses the adhesive material 8 as an appropriate amount to rotate the rotating roller 11 and the elastic roller 15. By passing the insulating paper 7 between them, the adhesive material 8 is formed on the flat surface of the insulating paper 7. In addition, another base material is allowed to pass between the rotating roller 11 and the elastic roller 15 instead of the insulating paper 7, the adhesive material 8 is pasted on the surface of the base material, and the base material and the insulating paper 7 are bonded together. Thus, the adhesive material 8 can be transferred onto the surface of the insulating paper 7. The adhesive material 8 formed on the surface of the insulating paper 7 by the concave portion 14 of the rotating roller 11 is intermittently formed, so that the application amount of the adhesive material 8 can be reduced and the penetration of the electrolyte into the insulating paper 7 is good. And The adhesive material 8 can be arbitrarily formed on the insulating paper 7 by arbitrarily forming the concave portion 14 on the surface of the rotating roller 11. As shown in FIGS. 2B and 2C, the shape of the adhesive material 8 formed on the insulating paper 7 can be linear, wavy, or dotted.
絶縁紙７は、電極箔に接続された引出端子４、５を覆うように、引出端子４、５と対向する他極の電極箔との間が２重になるようにセパレータ６に貼り付けられる。絶縁紙７は、セパレータ６の両面に貼り付けても良く、また一方の面にのみ貼り付けても良い。電解コンデンサの定格電圧が高い場合は、電極箔間の絶縁を確保するため、絶縁紙７をセパレータ６の両面に貼り付けることもあるが、その分コンデンサ素子１が大型化してしまうため、セパレータ６の一方の面にのみ絶縁紙７を設ける方が好ましい。また、絶縁紙７は、セパレータ６の電極箔に接続された引出端子４、５側の面に貼り付けられることが好ましい。これは、絶縁紙７によりセパレータ６が保護され、セパレータ６の損傷などにより本来セパレータ６が持つ耐電圧特性や絶縁性を損なうこと防止できるからである。また、前記絶縁紙７は駆動用電解液が満たされて保持された状態であり、引出端子４、５に直に当接するため、電解コンデンサの電気的特性を維持できる。 The insulating paper 7 is attached to the separator 6 so as to cover the lead terminals 4 and 5 connected to the electrode foil so that the space between the lead terminals 4 and 5 and the opposite electrode foil is doubled. . The insulating paper 7 may be attached to both sides of the separator 6 or may be attached only to one side. When the rated voltage of the electrolytic capacitor is high, insulating paper 7 may be attached to both surfaces of the separator 6 in order to ensure insulation between the electrode foils. It is preferable to provide the insulating paper 7 only on one side. The insulating paper 7 is preferably attached to the surface of the lead terminals 4 and 5 connected to the electrode foil of the separator 6. This is because the separator 6 is protected by the insulating paper 7, and it is possible to prevent the breakdown voltage characteristics and insulation properties inherent to the separator 6 from being damaged due to damage to the separator 6 or the like. Further, the insulating paper 7 is in a state where the driving electrolyte is filled and held, and is in direct contact with the lead terminals 4 and 5, so that the electrical characteristics of the electrolytic capacitor can be maintained.
ここで、セパレータ６へ貼り付けられた絶縁紙７の剥離強度について検討する。これは、セパレータ６を電極箔とともに巻回又は積層装置により素子化される際に絶縁紙７の位置ずれが生じない程度の貼り付け強度を検討し、これにより粘着材の塗布量の最適化を図るものである。従来は、絶縁紙７の全面に塗布されたものであり、この剥離強度は約７０〜１５０ｇ／ｃｍ２であった。ここで必要となる粘着状態を維持できる剥離強度は５〜３０ｇ／ｃｍ２であることが判明し、この強度を得られる範囲で粘着材の塗布量を低減することが好ましいことがわかった。 Here, the peel strength of the insulating paper 7 attached to the separator 6 will be examined. This examines the adhesive strength that does not cause the displacement of the insulating paper 7 when the separator 6 is wound together with the electrode foil or formed into an element by a laminating device, thereby optimizing the application amount of the adhesive material. It is intended. Conventionally, it was applied to the entire surface of the insulating paper 7, and the peel strength was about 70 to 150 g / cm 2 . Here, it was found that the peel strength capable of maintaining the necessary adhesive state was 5 to 30 g / cm 2 , and it was found preferable to reduce the coating amount of the adhesive material within a range where this strength can be obtained.
次に、本発明における電解コンデンサについて具体的に説明する。なお、本発明の範囲はこれらの実施例により限定される物ではなく、実施例中の材料、使用量、割合、操作などは、本発明の趣旨を逸脱しない限り適宜変更することができる。 Next, the electrolytic capacitor in the present invention will be specifically described. It should be noted that the scope of the present invention is not limited by these examples, and materials, amounts used, ratios, operations, and the like in the examples can be changed as appropriate without departing from the spirit of the present invention.
（実施例１）
陽極箔２として、アルミニウムの表面をエッチング処理及び化成処理して表面にエッチング層及び酸化皮膜層を形成した帯状の金属箔を、陰極箔３としてアルミニウムよりなる金属箔の表面をエッチング処理してエッチング層を形成した帯状の金属箔を用いた。陰極箔３及び陽極箔２には、帯状の引出端子４、５の一端が超音波溶接により接続されている。前記陰極箔３と陽極箔２の間には、クラフト紙からなるセパレータ６が介在され、該セパレータ６の陽極側の引出端子４と対応する部位に、密度が０．８５ｇ／ｃｍ３である高密度のクラフト紙と密度が０．３０ｇ／ｃｍ３である低密度のマニラ麻紙を貼り合わせた絶縁紙７が、該絶縁紙７の高密度紙側の表面にドクターブレード法により線状に塗布されたアクリル系粘着材８により貼り付けられている。なお、前記絶縁紙７は、セパレータ６の陽極側の引出端子側の面に貼り付けられている。前記陽極箔２と陰極箔３は巻回されてコンデンサ素子１を形成し、駆動用電解液が含浸されるとともに、アルミニウムよりなる有底筒状の外装ケースに収納され、開口端をゴムよりなる封口体にて封止される。
絶縁紙の高密度紙側の面にアクリル系粘着材を間欠的に塗布したものであり、陽極箔の箔面積を１０ｃｍ２〜２００ｃｍ２の間で代え、絶縁紙７の面積を３ｃｍ２とし、該絶縁紙７に塗布された粘着材８の塗布面積を２ｃｍ２とした。陽極引出端子４を１箇所、該引出端子４に対応するセパレータ６の部位に絶縁紙７を配置した。２０℃、１２０ＨｚでのＥＳＲを測定した。なお、図４は陽極箔面積に対する粘着材の面積とＥＳＲ特性を示すグラフである。
Example 1
As the anode foil 2, a strip-shaped metal foil having an etching layer and an oxide film layer formed on the surface by etching and conversion treatment on the surface of the aluminum is etched, and the surface of the metal foil made of aluminum is etched and etched as the cathode foil 3. A band-shaped metal foil having a layer formed thereon was used. One end of strip-shaped lead terminals 4 and 5 is connected to the cathode foil 3 and the anode foil 2 by ultrasonic welding. A separator 6 made of kraft paper is interposed between the cathode foil 3 and the anode foil 2, and the density is 0.85 g / cm 3 at a portion corresponding to the lead-out terminal 4 on the anode side of the separator 6. An acrylic paper in which a kraft paper and a low density Manila hemp paper with a density of 0.30 g / cm3 are bonded together are linearly applied to the surface of the insulating paper 7 on the high density paper side by a doctor blade method. It is affixed by the system adhesive material 8. The insulating paper 7 is affixed to the surface of the separator 6 on the anode-side lead-out terminal side. The anode foil 2 and the cathode foil 3 are wound to form a capacitor element 1, impregnated with a driving electrolyte, and housed in a bottomed cylindrical outer case made of aluminum, with an opening end made of rubber. Sealed with a sealing body.
The surface of the high-density paper side of the insulating sheet is obtained by intermittently applying an acrylic adhesive, the foil area of the anode foil instead between 10cm 2 ~200cm 2, the area of the insulating sheet 7 and 3 cm 2, The application area of the adhesive material 8 applied to the insulating paper 7 was 2 cm 2 . Insulating paper 7 was disposed at one location of the anode lead terminal 4 and at a portion of the separator 6 corresponding to the lead terminal 4. ESR was measured at 20 ° C. and 120 Hz. FIG. 4 is a graph showing the area of the adhesive material and the ESR characteristic with respect to the anode foil area.
図４より、絶縁紙７に塗布される粘着材８の塗布面積が小さいほど低周波領域でのＥＳＲが良好であることがわかる。特に粘着材８の塗布面積が６％を越えると急激に悪化することが分かり、６％以下であれば良好な結果がえられ、塗布面積が小さいほど好ましいが、３％以下であればＥＳＲの上昇が余り見られず、またセパレータ６への絶縁紙７の貼り付け強度を考慮すると、粘着材８の塗布面積は０．５％以上が好ましいことがわかった。 FIG. 4 shows that the smaller the application area of the adhesive 8 applied to the insulating paper 7, the better the ESR in the low frequency region. In particular, it is found that when the application area of the adhesive 8 exceeds 6%, it rapidly deteriorates. When the application area is 6% or less, good results are obtained. The smaller the application area, the better. It has been found that the increase in the application area of the adhesive material 8 is preferably 0.5% or more in view of the strength of affixing the insulating paper 7 to the separator 6 with little increase.
１ コンデンサ素子
２ 陽極箔
３ 陰極箔
４ 陽極側の引出端子
５ 陰極側の引出端子
６ セパレータ
７ 絶縁紙
８ 粘着材
９ 高密度紙
１０ 低密度紙
１１ 回転ローラー
１２ ドクター刃
１３ 槽
１４ 食刻凹部
１５ 弾性ローラー
DESCRIPTION OF SYMBOLS 1 Capacitor element 2 Anode foil 3 Cathode foil 4 Extraction terminal 5 on the anode side Extraction terminal 6 on the cathode side Separator 7 Insulating paper 8 Adhesive material 9 High density paper 10 Low density paper 11 Rotating roller 12 Doctor blade 13 Tank 14 Etching recess 15 Elastic roller
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| JP2000012399A (en) * | 1998-06-24 | 2000-01-14 | Nitto Denko Corp | Adhesive tape for adhering electrolytic capacitor element terminal |
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