JP5247495B2 - Solid electrolytic capacitor - Google Patents

Solid electrolytic capacitor Download PDF

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JP5247495B2
JP5247495B2 JP2009013285A JP2009013285A JP5247495B2 JP 5247495 B2 JP5247495 B2 JP 5247495B2 JP 2009013285 A JP2009013285 A JP 2009013285A JP 2009013285 A JP2009013285 A JP 2009013285A JP 5247495 B2 JP5247495 B2 JP 5247495B2
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anode
foil
anode foil
solid electrolytic
electrolytic capacitor
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JP2010171261A (en
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宏三 石原
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Sanyo Electric Co Ltd
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Description

本発明は固体電解コンデンサに関し、特に、陽極箔を積層または巻回させた固体電解コンデンサに関するものである。   The present invention relates to a solid electrolytic capacitor, and more particularly to a solid electrolytic capacitor in which an anode foil is laminated or wound.

近年、電子機器の小型化や高周波化により、電子部品にも小型化や高周波化が求められている。そのような電子部品の一つとして固体電解コンデンサがある。たとえば、特許文献１では、アルミニウム箔からなる陽極帯の表面に誘電体酸化被膜を形成した後に、絶縁性のレジスト部を設けて陽極部と陰極部に分離し、この陰極部に固体電解質層と陰極層とを順次積層して形成されたコンデンサ素子を備えた固体電解コンデンサが提案されている。また、特許文献２では、陽極箔と陰極箔との間にセパレータを介在させ、巻回することによって形成されたコンデンサ素子を備えた固体電解コンデンサが提案されている。   In recent years, electronic components are required to be reduced in size and high in frequency due to downsizing and high frequency of electronic devices. One such electronic component is a solid electrolytic capacitor. For example, in Patent Document 1, after forming a dielectric oxide film on the surface of an anode strip made of aluminum foil, an insulating resist portion is provided to separate the anode portion and the cathode portion, and a solid electrolyte layer and There has been proposed a solid electrolytic capacitor including a capacitor element formed by sequentially laminating a cathode layer. Patent Document 2 proposes a solid electrolytic capacitor having a capacitor element formed by interposing a separator between an anode foil and a cathode foil and winding the separator.

特開２００４−８７８９３号公報Japanese Patent Laid-Open No. 2004-87893 特開平１１−３４５７４９号公報Japanese Patent Laid-Open No. 11-345749

本発明は、固体電解コンデンサの開発の一環で、所定の凹部が形成された陽極箔を用いることにより陰極箔およびセパレータを実質的に不要とする固体電解コンデンサを提案するものであり、その目的は、そのような所定の凹部が形成された陽極箔を積層、または、巻回した固体電解コンデンサを提供することである。   As part of the development of a solid electrolytic capacitor, the present invention proposes a solid electrolytic capacitor that substantially eliminates the need for a cathode foil and a separator by using an anode foil in which predetermined recesses are formed. An object of the present invention is to provide a solid electrolytic capacitor in which an anode foil in which such a predetermined recess is formed is laminated or wound.

本発明に係る固体電解コンデンサは、陽極部材と陰極部材とを備えている。陽極部材は、互いに対向する第１表面および第２表面を有する陽極箔を含み、少なくとも第１表面に所定の凹部が形成され、陽極箔における一の部分の凹部が、陽極箔における他の部分の第２表面によって覆われるように、一の部分と他の部分とを接触させる態様で配置されている。陰極部材は、他の部分の第２表面によって覆われた一の部分の凹部に充填された導電性高分子材料を含んでいる。   The solid electrolytic capacitor according to the present invention includes an anode member and a cathode member. The anode member includes an anode foil having a first surface and a second surface facing each other, and a predetermined recess is formed on at least the first surface, and a recess in one part of the anode foil is formed in another part of the anode foil. It arrange | positions in the aspect which contacts one part and another part so that it may be covered with a 2nd surface. The negative electrode member includes a conductive polymer material filled in a concave portion of one part covered by the second surface of the other part.

本発明に係る固体電解コンデンサによれば、陽極箔における一の部分の凹部が、陽極箔における他の部分の第２表面によって覆われるように、一の部分と他の部分とを接触させる態様で陽極部材が配置され、他の部分の第２表面によって覆われた一の部分の凹部に充填された導電性高分子材料を陰極部材が含んでいることで、単に平板状の陽極箔に導電性ポリマーを介在させて陽極箔を積層させることによって形成された固体電解コンデンサの場合と比べて、リーク電流を低減することができる。また、陰極箔やセパレータを実質的になくすことができる。   According to the solid electrolytic capacitor in accordance with the present invention, the one part and the other part are brought into contact so that the concave part of the one part of the anode foil is covered with the second surface of the other part of the anode foil. Since the anode member is disposed and the cathode member contains the conductive polymer material filled in the concave portion of one part covered by the second surface of the other part, the conductive material is simply made conductive in the flat anode foil. Leakage current can be reduced as compared with a solid electrolytic capacitor formed by laminating anode foil with a polymer interposed. Further, the cathode foil and the separator can be substantially eliminated.

そのような陽極部材の具体的な配置の仕方としては、それぞれ所定の長さを有する複数の陽極箔を積層させる態様で配置されているか、あるいは、所定の長さを有する帯状の陽極箔を巻回させる態様で配置されていることが好ましい。   As a specific arrangement method of such an anode member, a plurality of anode foils each having a predetermined length are laminated, or a strip-like anode foil having a predetermined length is wound. It is preferable to arrange in a rotating manner.

さらに、陽極部材および陰極部材を含むコンデンサ素子を封止する封止樹脂を備えていることが好ましい。   Furthermore, it is preferable that a sealing resin for sealing the capacitor element including the anode member and the cathode member is provided.

本発明の実施の形態１に係る固体電解コンデンサの製造工程を説明するための陽極箔を示す斜視図である。It is a perspective view which shows the anode foil for demonstrating the manufacturing process of the solid electrolytic capacitor which concerns on Embodiment 1 of this invention. 同実施の形態において、陽極箔の構造を示す部分断面図である。In the same embodiment, it is a fragmentary sectional view which shows the structure of anode foil. 同実施の形態において、複数の陽極箔を積層させた状態を示す側面図である。In the same embodiment, it is a side view which shows the state which laminated | stacked several anode foil. 同実施の形態において、積層させた陽極箔の凹部に導電性ポリマーを充填した様子を示す第１の斜視図である。In the same embodiment, it is the 1st perspective view which shows a mode that the conductive polymer was filled into the recessed part of the laminated anode foil. 同実施の形態において、積層させた陽極箔の凹部に導電性ポリマーを充填した様子を示す第２の斜視図である。In the same embodiment, it is the 2nd perspective view which shows a mode that the conductive polymer was filled into the recessed part of the laminated | stacked anode foil. 同実施の形態において、封止樹脂によってコンデンサ素子を封止した固体電解コンデンサを示す側面図である。In the same embodiment, it is a side view which shows the solid electrolytic capacitor which sealed the capacitor | condenser element with sealing resin. 同実施の形態において、陽極箔の凹部における導電性ポリマーの流れを示す斜視図である。In the same embodiment, it is a perspective view which shows the flow of the conductive polymer in the recessed part of anode foil. 同実施の形態において、変形例に係る陽極箔を示す斜視図である。In the same embodiment, it is a perspective view which shows the anode foil which concerns on a modification. 同実施の形態において、他の変形例に係る陽極箔を示す斜視図である。In the same embodiment, it is a perspective view which shows the anode foil which concerns on another modification. 同実施の形態において、図９に示す陽極箔を用いて形成されたコンデンサ素子を示す斜視図である。FIG. 10 is a perspective view showing a capacitor element formed using the anode foil shown in FIG. 9 in the same embodiment. 本発明の実施の形態２に係る固体電解コンデンサの製造工程を説明するための巻回されたコンデンサ素子を示す正面図である。It is a front view which shows the wound capacitor | condenser element for demonstrating the manufacturing process of the solid electrolytic capacitor which concerns on Embodiment 2 of this invention. 同実施の形態において、封止樹脂によってコンデンサ素子を封止した固体電解コンデンサを示す斜視図である。In the same embodiment, it is a perspective view which shows the solid electrolytic capacitor which sealed the capacitor | condenser element with sealing resin.

実施の形態１
ここでは、陽極箔を積層することによって形成される固体電解コンデンサについて説明する。まず、アルミニウム箔（平板）を用意し、たとえば、所定の凹凸が形成されたローラにアルミニウム箔を挟み込むことにより、アルミニウム箔に導電性ポリマーを充填するための凹部を形成する。あるいは、アルミニウム箔に凹凸のパターンに基づく所定のレジストパターンを形成し、そのレジストパターンをマスクとしてアルミニウム箔の表面にエッチングを施すことによって、そのような凹部を形成してもよい。 Embodiment 1
Here, a solid electrolytic capacitor formed by laminating anode foils will be described. First, an aluminum foil (flat plate) is prepared, and, for example, the aluminum foil is sandwiched between rollers having predetermined irregularities, thereby forming a recess for filling the aluminum foil with a conductive polymer. Alternatively, such a recess may be formed by forming a predetermined resist pattern based on the uneven pattern on the aluminum foil and etching the surface of the aluminum foil using the resist pattern as a mask.

次に、凹部が形成されたアルミニウム箔に化成処理を施すことにより、アルミニウム箔の表面に酸化アルミニウム（Ａｌ2Ｏ3）被膜を形成する。次に、凹部が形成されたアルミニウム箔を、所定のサイズのアルミニウム箔に切断する。さらに化成処理を施すことにより、切断されたアルミニウム箔の端面に酸化アルミニウム被膜を形成する。こうして、図１に示すように、個々の陽極箔６が形成される。図２に示すように、陽極箔６では、アルミニウム箔３の表面に酸化アルミニウム被膜５が形成され、この酸化アルミニウム被膜５が誘電体膜としての機能を有する。 Next, an aluminum oxide (Al 2 O 3 ) film is formed on the surface of the aluminum foil by subjecting the aluminum foil having the recesses to chemical conversion treatment. Next, the aluminum foil in which the concave portion is formed is cut into an aluminum foil having a predetermined size. Further, a chemical conversion treatment is performed to form an aluminum oxide film on the end face of the cut aluminum foil. Thus, individual anode foils 6 are formed as shown in FIG. As shown in FIG. 2, in the anode foil 6, an aluminum oxide film 5 is formed on the surface of the aluminum foil 3, and this aluminum oxide film 5 has a function as a dielectric film.

次に、図３に示すように、凹部４が形成された陽極箔６ａ，６ｂ，６ｃ，６ｄを、一の陽極箔の凹部を他の陽極箔で覆うようにして順次積層する。次に、積層された陽極箔６を水溶性の導電性ポリマーに浸漬することにより、図４および図５に示すように、各陽極箔６の凹部４に導電性ポリマー７を充填する。次に、各陽極箔６ａ，６ｂ，６ｃ，６ｄのアルミニウム箔の部分同士を電気的に接続する陽極ピン８を取り付ける。こうしてコンデンサ素子２が形成される。   Next, as shown in FIG. 3, the anode foils 6a, 6b, 6c, and 6d in which the recesses 4 are formed are sequentially laminated so that the recesses of one anode foil are covered with another anode foil. Next, by immersing the laminated anode foil 6 in a water-soluble conductive polymer, the conductive polymer 7 is filled in the recess 4 of each anode foil 6 as shown in FIGS. Next, the anode pin 8 for electrically connecting the aluminum foil portions of the anode foils 6a, 6b, 6c, and 6d is attached. In this way, the capacitor element 2 is formed.

次に、陽極リード端子２１（図６参照）を陽極ピン８に接続するとともに、陰極リード端子２２（図６参照）を、各陽極箔６ａ，６ｂ，６ｃ，６ｄの凹部４にそれぞれ充填された導電性ポリマー７に接続した状態で、コンデンサ素子２を所定の金型（図示せず）内に装着する。次に、その金型内に所定の樹脂を注入することにより、コンデンサ素子２が封止樹脂に封止される。   Next, the anode lead terminal 21 (see FIG. 6) was connected to the anode pin 8, and the cathode lead terminal 22 (see FIG. 6) was filled in the recess 4 of each anode foil 6a, 6b, 6c, 6d. The capacitor element 2 is mounted in a predetermined mold (not shown) while being connected to the conductive polymer 7. Next, by injecting a predetermined resin into the mold, the capacitor element 2 is sealed with a sealing resin.

その後、金型からコンデンサ素子を取り出すことによって、図６に示すように、コンデンサ素子２を封止樹脂２０によって封止した固体電解コンデンサ１が形成される。封止樹脂２０の底面には、陽極リード端子２１と陰極リード端子２２が露出している。   Thereafter, by removing the capacitor element from the mold, the solid electrolytic capacitor 1 in which the capacitor element 2 is sealed with the sealing resin 20 is formed as shown in FIG. An anode lead terminal 21 and a cathode lead terminal 22 are exposed on the bottom surface of the sealing resin 20.

上述した固体電解コンデンサ１では、凹部４を形成した陽極箔６を、一の陽極箔６の凹部を他の陽極箔６で覆うように互いに接触させながら積層し、その積層された陽極箔６の各凹部４に、陰極となる導電性ポリマー７を充填することで、単に平板状の陽極箔に導電性ポリマーを介在させて陽極箔を積層させることによって固体電解コンデンサを形成する場合と比べて、導電性ポリマーの厚みに起因する陽極箔同士の隙間を、陽極箔を曲げて詰めるようなことがなくなり、そのような陽極箔を曲げることに起因するリーク電流を抑制することができる。また、陽極箔６にそのような曲げの部分がないことで、その曲げの部分に起因したＬＣ成分を低減することができる。   In the solid electrolytic capacitor 1 described above, the anode foil 6 in which the recess 4 is formed is stacked while being in contact with each other so that the recess of one anode foil 6 is covered with another anode foil 6. Compared to the case where a solid electrolytic capacitor is formed by simply laminating an anode foil by interposing a conductive polymer in a flat plate-like anode foil by filling each concave portion 4 with a conductive polymer 7 serving as a cathode, The gap between the anode foils caused by the thickness of the conductive polymer is not filled by bending the anode foil, and the leakage current caused by bending such an anode foil can be suppressed. Further, since the anode foil 6 does not have such a bent portion, the LC component due to the bent portion can be reduced.

さらに、上述した固体電解コンデンサの陽極箔に形成する凹部としてはＴ字型の凹部を例に挙げて説明した。図７に示すように、このＴ字型の凹部４では、凹部４に導電性ポリマーを充填する際に、矢印３０に示すように、導電性ポリマーを一方の部分から他方の部分へ滑らかに流すことができ、凹部４へ導電性ポリマーを確実に充填することができる。   Further, as the concave portion formed in the anode foil of the solid electrolytic capacitor described above, a T-shaped concave portion has been described as an example. As shown in FIG. 7, in the T-shaped recess 4, when the recess 4 is filled with the conductive polymer, as shown by an arrow 30, the conductive polymer flows smoothly from one part to the other part. It is possible to reliably fill the recess 4 with the conductive polymer.

また、陽極箔に形成する凹部としては、陽極箔の一方の面に形成する他に、図８に示すように、陽極箔６の一方の面と他方の面との双方に凹部４ａ，４ｂを形成するようにしてもよい。このような場合でも、導電性ポリマーを一方の部分から他方の部分へ滑らかに流すことができ、凹部４へ導電性ポリマーを確実に充填することができる。さらに、互いに対向する陽極箔のそれぞれの凹部に導電性ポリマーが充填されることで、陽極箔同士をより強固に接着することができる。   Moreover, as a recessed part formed in anode foil, in addition to forming in one surface of anode foil, as shown in FIG. 8, recessed part 4a, 4b is formed in both the one surface and the other surface of anode foil 6. You may make it form. Even in such a case, the conductive polymer can flow smoothly from one part to the other part, and the concave part 4 can be filled with the conductive polymer reliably. Furthermore, the anode foils can be bonded more firmly by filling the respective concave portions of the anode foils facing each other with the conductive polymer.

また、導電性ポリマーを一方の部分から他方の部分へ滑らかに流すことが可能な凹部としては、図９に示すように、陽極箔６の互いに対向する一端から他端へ延在するような凹部４としてもよい。このような陽極箔を適用しても、図１０に示すように、各陽極箔６ａ，６ｂ，６ｃ，６ｄの凹部に導電性ポリマー７を確実に充填することができる。   Moreover, as a recessed part which can make a conductive polymer flow smoothly from one part to the other part, as shown in FIG. 9, the recessed part extended from the mutually opposing one end to the other end of the anode foil 6 It may be 4. Even if such an anode foil is applied, as shown in FIG. 10, the conductive polymer 7 can be reliably filled in the concave portions of the anode foils 6a, 6b, 6c, and 6d.

実施の形態２
ここでは、陽極箔を巻回することによって形成される固体電解コンデンサについて説明する。まず、前述した工程と同様の工程を経て、所定の凹部を有し、化成処理が施されたアルミニウム箔が得られる。次に、そのアルミニウム箔を所定の長さの帯状のアルミニウム箔に切断する。さらに化成処理を施すことにより、切断されたアルミニウム箔の端面に酸化アルミニウム被膜を形成する。そのアルミニウム箔に陽極リード（陽極ピン）を取り付ける。こうして、帯状の陽極箔が形成される。 Embodiment 2
Here, a solid electrolytic capacitor formed by winding an anode foil will be described. First, an aluminum foil having a predetermined recess and subjected to chemical conversion treatment is obtained through the same steps as described above. Next, the aluminum foil is cut into a strip-shaped aluminum foil having a predetermined length. Further, a chemical conversion treatment is performed to form an aluminum oxide film on the end face of the cut aluminum foil. An anode lead (anode pin) is attached to the aluminum foil. Thus, a strip-like anode foil is formed.

次に、図１１に示すように、帯状の陽極箔６をその一端側から巻回する。巻回された陽極箔６の最外周を覆うように、アルミニウム箔９を巻き付ける。このアルミニウム箔９は陰極部材の一部となる。次に、陽極箔６を水溶性の導電性ポリマーに浸漬することにより、巻回されて内側に位置する陽極箔６の部分の凹部４と、その外側に位置して凹部４を覆う陽極箔６の表面との間の隙間（空間）に導電性ポリマー７を充填する。こうして、コンデンサ素子２が形成される。   Next, as shown in FIG. 11, the strip-shaped anode foil 6 is wound from one end side thereof. The aluminum foil 9 is wound so as to cover the outermost periphery of the wound anode foil 6. This aluminum foil 9 becomes a part of the cathode member. Next, the anode foil 6 is dipped in a water-soluble conductive polymer so that the anode foil 6 is wound and located on the inner side of the concave portion 4, and the anode foil 6 is located outside and covers the concave portion 4. The conductive polymer 7 is filled in a gap (space) between the surface of the substrate. Thus, the capacitor element 2 is formed.

次に、導電性接着剤、抵抗溶接、または、レーザ溶接等により陽極リード２１（図１２参照）をコンデンサ素子２の陽極ピン８に取り付ける。また、導電性接着剤等により陰極リード２２（図１２参照）をアルミニウム箔９に取り付ける。次に、コンデンサ素子２を所定の金型（図示せず）内に装着する。次に、その金型内に所定の樹脂を注入することにより、コンデンサ素子２が封止樹脂に封止される。その後、金型からコンデンサ素子を取り出すことによって、図１２に示すように、コンデンサ素子２を封止樹脂２０によって封止した固体電解コンデンサ１が形成される。封止樹脂２０の底面には、陽極リード端子２１と陰極リード端子２２が露出している。   Next, the anode lead 21 (see FIG. 12) is attached to the anode pin 8 of the capacitor element 2 by conductive adhesive, resistance welding, laser welding, or the like. Further, the cathode lead 22 (see FIG. 12) is attached to the aluminum foil 9 with a conductive adhesive or the like. Next, the capacitor element 2 is mounted in a predetermined mold (not shown). Next, by injecting a predetermined resin into the mold, the capacitor element 2 is sealed with a sealing resin. Thereafter, by removing the capacitor element from the mold, the solid electrolytic capacitor 1 in which the capacitor element 2 is sealed with the sealing resin 20 is formed as shown in FIG. An anode lead terminal 21 and a cathode lead terminal 22 are exposed on the bottom surface of the sealing resin 20.

上述した固体電解コンデンサでは、化成処理が施された陽極箔の凹部に陰極部材となる導電性高分子材料が充填されることで、陽極箔と陰極箔との間にセパレータを介在させて巻回した固体電解コンデンサと比べて、そのようなセパレータが不要となって、陽極箔の長さをより長くすることができて、電解コンデンサとしての容量を容易に確保することができる。   In the above-described solid electrolytic capacitor, a conductive polymer material serving as a cathode member is filled in the concave portion of the anode foil that has been subjected to chemical conversion treatment, so that a separator is interposed between the anode foil and the cathode foil. Compared to the solid electrolytic capacitor, such a separator becomes unnecessary, the length of the anode foil can be made longer, and the capacity as the electrolytic capacitor can be easily secured.

また、コンデンサ素子２の最外周に巻き付けられたアルミニウム箔９に、陰極リード２２を直接接続させることができて、等価直列インダクタンス（ＥＳＬ：Equivalent Series Inductance）成分の低減に寄与することができる。   Further, the cathode lead 22 can be directly connected to the aluminum foil 9 wound around the outermost periphery of the capacitor element 2, which can contribute to the reduction of an equivalent series inductance (ESL) component.

今回開示された実施の形態は例示であってこれに制限されるものではない。本発明は上記で説明した範囲ではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲でのすべての変更が含まれることが意図される。   The embodiment disclosed this time is an example, and the present invention is not limited to this. The present invention is defined by the terms of the claims, rather than the scope described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

１ 固体電解コンデンサ、２ コンデンサ素子、３ アルミニウム箔、４ 凹部、４ａ，４ｂ 凹部、５ 酸化アルミニウム、６ 陽極箔、６ａ，６ｂ，６ｃ，６ｄ 陽極箔、７ 導電性ポリマー、８ 陽極ピン、９ アルミニウム箔、２０ 封止樹脂、２１ 陽極リード、２２ 陰極リード。   1 solid electrolytic capacitor, 2 capacitor element, 3 aluminum foil, 4 recess, 4a, 4b recess, 5 aluminum oxide, 6 anode foil, 6a, 6b, 6c, 6d anode foil, 7 conductive polymer, 8 anode pin, 9 aluminum Foil, 20 sealing resin, 21 anode lead, 22 cathode lead.

Claims (3)

互いに対向する第１表面および第２表面を有する第１及び第２陽極箔を含み、少なくとも前記第１陽極箔の前記第１表面に所定の凹部が形成され、前記第１陽極箔の前記凹部を、前記第２陽極箔の前記第２表面によって覆われるように、前記第１陽極箔と前記第２陽極箔とを接触させる態様で配置された陽極部材と、
前記凹部に充填された導電性高分子材料を含む陰極部材と、を備え、
前記凹部は、前記第１陽極箔の側面に３つの開口を有するＴ字型の形状からなる固体電解コンデンサ。 Includes first and second anode foil having a first surface and a second surface opposite to each other, a predetermined recess is formed on the first surface of at least the first anode foil, before Symbol recess of the first anode foil and to be covered by the previous SL second surface of the second anode foil, an anode member positioned in a manner of contacting with said first anode foil and the second anode foil,
E Bei and a cathode member comprising a conductive polymer material filled before Symbol recess,
The concave portion is a solid electrolytic capacitor having a T-shape having three openings on a side surface of the first anode foil . 前記陽極部材は、所定の長さを有する帯状の陽極箔を巻回させる態様で配置された、請求項１記載の固体電解コンデンサ。   2. The solid electrolytic capacitor according to claim 1, wherein the anode member is arranged in such a manner that a strip-like anode foil having a predetermined length is wound. 前記陽極部材および前記陰極部材を含むコンデンサ素子を封止する封止樹脂を備えた、請求項１又は２のいずれかに記載の固体電解コンデンサ。
It said anode member and said capacitor element including a cathode member provided with a sealing resin for sealing the solid electrolytic capacitor according to claim 1 or 2.
JP2009013285A 2009-01-23 2009-01-23 Solid electrolytic capacitor Expired - Fee Related JP5247495B2 (en)

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CN104882286A (en) * 2015-06-09 2015-09-02 湖南柯立凯科技开发有限公司 Solid-state aluminum electrolytic capacitor
CN104882286B (en) * 2015-06-09 2017-07-28 湖南柯立凯科技开发有限公司 A kind of solid-state aluminum electrolytic capacitor

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