JP5261538B2 - Solid electrolytic capacitor - Google Patents

Solid electrolytic capacitor Download PDF

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JP5261538B2
JP5261538B2 JP2011119246A JP2011119246A JP5261538B2 JP 5261538 B2 JP5261538 B2 JP 5261538B2 JP 2011119246 A JP2011119246 A JP 2011119246A JP 2011119246 A JP2011119246 A JP 2011119246A JP 5261538 B2 JP5261538 B2 JP 5261538B2
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cathode
anode
terminal
solid electrolytic
exterior resin
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JP2011160011A (en
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桂子 松岡
昌志 梅田
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Sanyo Electric Co Ltd
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Description

本発明は、コンデンサ素子に接続している陽極端子及び陰極端子が、外装樹脂の周囲を入り込むことなく外装樹脂から露出する固体電解コンデンサに関する。   The present invention relates to a solid electrolytic capacitor in which an anode terminal and a cathode terminal connected to a capacitor element are exposed from an exterior resin without entering the periphery of the exterior resin.

従来の固体電解コンデンサとして、例えば図５に示すような構造のものが知られている。すなわち、図５は、図４に示すような陽極リード２１が植立された陽極体２２の周面に誘電体皮膜層３、陰極層４１、陰極引出層４２が順次形成されてなるコンデンサ素子１と、外装樹脂６と、陽極端子７及び陰極端子８を具えており、前記陽極端子７及び陰極端子８の一部は前記外装樹脂６から露出し、該外装樹脂６の周面に沿って折り曲げてなる。   For example, a conventional solid electrolytic capacitor having a structure as shown in FIG. 5 is known. That is, FIG. 5 shows a capacitor element 1 in which the dielectric coating layer 3, the cathode layer 41, and the cathode lead layer 42 are sequentially formed on the peripheral surface of the anode body 22 on which the anode lead 21 is implanted as shown in FIG. And an exterior resin 6, and an anode terminal 7 and a cathode terminal 8, and a part of the anode terminal 7 and the cathode terminal 8 is exposed from the exterior resin 6 and is bent along the peripheral surface of the exterior resin 6. It becomes.

このような構造の固体電解コンデンサを作製するには、コンデンサ素子１を外装樹脂６で被覆後、外装樹脂６から露出している陽極及び陰極端子７、８を外装樹脂６に沿って折り曲げる工程が必要であった。また、この折り曲げは、実際には垂直に曲げることは困難であり、ある程度の歪みができてしまう。この歪みのため、作製された固体電解コンデンサが規格より大きくなってしまい、製品不良につながるという問題もあった。さらには、陽極及び陰極端子７、８を折り曲げるためには、曲げ代が必要なため、外装樹脂６の大きさをある程度確保しなければならず、従って固体電解コンデンサの小型低背化や、コンデンサ素子１の体積効率を向上させることが困難であった。また、コンデンサ素子の陽極リード及び陰極引出層から陽極端子及び陰極端子の端子となる部分への引出し距離が長く、固体電解コンデンサの低ＥＳＲ化ができないという問題があった。   In order to fabricate a solid electrolytic capacitor having such a structure, the capacitor element 1 is covered with the exterior resin 6 and then the anode and cathode terminals 7 and 8 exposed from the exterior resin 6 are bent along the exterior resin 6. It was necessary. In addition, this bending is actually difficult to be bent vertically, and a certain amount of distortion is generated. Due to this distortion, the produced solid electrolytic capacitor becomes larger than the standard, leading to a problem of product failure. Furthermore, since bending allowance is required to bend the anode and cathode terminals 7 and 8, the size of the exterior resin 6 must be ensured to some extent. It was difficult to improve the volume efficiency of the element 1. In addition, there is a problem that the lead-out distance from the anode lead and cathode lead layer of the capacitor element to the portions serving as the terminals of the anode terminal and the cathode terminal is long, and the ESR of the solid electrolytic capacitor cannot be reduced.

上記の問題点を解決するため、例えば特許文献１や特許文献２のような構造の固体電解コンデンサが提案されている。   In order to solve the above-mentioned problems, for example, solid electrolytic capacitors having structures such as Patent Document 1 and Patent Document 2 have been proposed.

特開２００１−２４４１４５号公報JP 2001-244145 A 特開２００１−１６７９７６号公報JP 2001-167976 A

特許文献１の固体電解コンデンサは、外装樹脂と、陽極端子及び陰極端子の下端面とが同一平面を形成している。このような構造の固体電解コンデンサを作製するには、コンデンサ素子と陽極端子及び陰極端子とを接続した後、モールド成形時に外装樹脂が陽極端子及び陰極端子の下面に入りこまないように、陽極端子及び陰極端子の下面を絶縁テープ等で保護する必要がある。また、陽極端子及び陰極端子の下面に絶縁テープ等を貼り付けても外装樹脂の入りこみを完全に防ぐことはできず、製品不良が起こるという問題がある。さらには、モールド成形時に上型と下型の界面にテープの厚みを考慮したスペースを設ける必要があり、テープに対するモールド金型の圧力が十分に大きくないためにテープ貼り付け面に外装樹脂が漏れてしまうという問題もある。   In the solid electrolytic capacitor of Patent Document 1, the exterior resin and the lower end surfaces of the anode terminal and the cathode terminal form the same plane. In order to manufacture a solid electrolytic capacitor having such a structure, after connecting the capacitor element to the anode terminal and the cathode terminal, the anode terminal is used so that the exterior resin does not enter the lower surface of the anode terminal and the cathode terminal during molding. In addition, it is necessary to protect the lower surface of the cathode terminal with an insulating tape or the like. Further, even if an insulating tape or the like is attached to the lower surfaces of the anode terminal and the cathode terminal, it is not possible to completely prevent the exterior resin from entering, and there is a problem that a product defect occurs. Furthermore, it is necessary to provide a space in consideration of the tape thickness at the interface between the upper mold and the lower mold at the time of molding, and the exterior mold resin leaks to the tape application surface because the pressure of the mold mold against the tape is not sufficiently large. There is also a problem that it ends up.

また、特許文献２は、陽極端子及び陰極端子間が絶縁テープにより絶縁することで、外装樹脂の体積を減少させ、コンデンサ素子の体積効率をはかっている。しかしながら、このような構造の固体電解コンデンサを作製するには、陽極端子及び陰極端子となる導電シートに絶縁シートを貼る工程が必要である。また、このような構造では、コンデンサ素子と陰極端子との接触面積が小さくなってしまうと共に、コンデンサ素子の陰極層と陰極端子との引出し距離が少なくとも絶縁テープの厚み分以上となり、固体電解コンデンサのＥＳＲが低減できないという問題がある。   In Patent Document 2, the anode terminal and the cathode terminal are insulated by an insulating tape, thereby reducing the volume of the exterior resin and increasing the volume efficiency of the capacitor element. However, in order to produce a solid electrolytic capacitor having such a structure, a step of attaching an insulating sheet to the conductive sheets to be the anode terminal and the cathode terminal is necessary. Further, in such a structure, the contact area between the capacitor element and the cathode terminal is reduced, and the lead-out distance between the cathode layer and the cathode terminal of the capacitor element is at least as much as the thickness of the insulating tape. There is a problem that ESR cannot be reduced.

上記の問題を鑑みて、本発明は、陽極部及び陰極部を具えたコンデンサ素子と、該陽極部と電気的に接続されている陽極端子と、該陰極部と電気的に接続されている陰極端子と、前記コンデンサ素子を被覆する外装樹脂とを具える固体電解コンデンサにおいて、前記陰極端子は、上段部と下段部と側部とを有し、前記上段部は、前記陰極部と接続され、前記下段部は、前記外装樹脂から露出し、前記側部は、前記上段部から前記陰極部の側面に沿って延在するとともに、該側面と接続され、前記陽極端子および陰極端子が並ぶ方向において、前記側部の長さは、前記上段部の長さよりも長いことを特徴とする。   In view of the above problems, the present invention provides a capacitor element including an anode part and a cathode part, an anode terminal electrically connected to the anode part, and a cathode electrically connected to the cathode part. In a solid electrolytic capacitor comprising a terminal and an exterior resin covering the capacitor element, the cathode terminal has an upper stage part, a lower stage part, and a side part, and the upper stage part is connected to the cathode part, The lower step portion is exposed from the exterior resin, and the side portion extends from the upper step portion along the side surface of the cathode portion, and is connected to the side surface in a direction in which the anode terminal and the cathode terminal are arranged. The length of the side part is longer than the length of the upper stage part.

また、前記上段部の上面は、前記陰極部の下面と接続され、前記下段部の下面は、前記外装樹脂から露出し、前記下段部の上面の少なくとも一部は、外装樹脂を介して前記陰極部の下面の一部と対向することが好ましい。   The upper surface of the upper stage is connected to the lower surface of the cathode part, the lower surface of the lower stage is exposed from the exterior resin, and at least a part of the upper surface of the lower stage is formed via the exterior resin. It is preferable to face a part of the lower surface of the part.

前記陽極端子および陰極端子が連なる方向において、前記側部の長さが前記上段部の長さよりも長いことにより、コンデンサ素子の陰極部と陰極端子との接触面積が大きくなり、固体電解コンデンサのＥＳＲの低減に寄与することができる。   In the direction in which the anode terminal and the cathode terminal are connected, the length of the side portion is longer than the length of the upper stage portion, thereby increasing the contact area between the cathode portion and the cathode terminal of the capacitor element, and the ESR of the solid electrolytic capacitor. It can contribute to the reduction of.

本発明の一実施形態の固体電解コンデンサの断面図である。It is sectional drawing of the solid electrolytic capacitor of one Embodiment of this invention. 本発明の別の実施形態の固体電解コンデンサの断面図である。It is sectional drawing of the solid electrolytic capacitor of another embodiment of this invention. 図２の固体電解コンデンサのＸ方向透視図である。FIG. 3 is a perspective view in the X direction of the solid electrolytic capacitor of FIG. 2. コンデンサ素子の断面図である。It is sectional drawing of a capacitor | condenser element. 従来の固体電解コンデンサの断面図である。It is sectional drawing of the conventional solid electrolytic capacitor.

本発明の固体電解コンデンサについて、図を用いて説明する。
（実施形態１）
図１は、本発明の第１の実施形態の固体電解コンデンサの断面図である。該固体電解コンデンサは、コンデンサ素子１と、外装樹脂６と、陽極端子７と、陰極端子８を具えており、少なくとも陽極端子７及び陰極端子８の下面及び外装樹脂６から露出した側面はメッキ処理されている。ここで示すコンデンサ素子１は、例えば図４に示すような構造をしている。即ち陽極リード２１を植立した陽極体２２の周面に、誘電体皮膜層３及び陰極層４１、陰極引出層４２からなる陰極部４を順次積層して構成されている。これら陽極リード２１、陽極体２２、誘電体皮膜層３、陰極層４１、陰極引出層４２は、既知の種々の材料を用いることができ、また誘電体皮膜層３、陰極層４１、陰極引出層４２は、単層からなっていても、複数の層から形成されていてもよい。ここでコンデンサ素子１は、上記のように陽極リード２１を植立した陽極体２２を用いることは必ずしも必要ではなく、例えば
アルミニウム箔のような箔状のものを用いてもよい。 The solid electrolytic capacitor of the present invention will be described with reference to the drawings.
(Embodiment 1)
FIG. 1 is a cross-sectional view of a solid electrolytic capacitor according to a first embodiment of the present invention. The solid electrolytic capacitor includes a capacitor element 1, an exterior resin 6, an anode terminal 7, and a cathode terminal 8. At least a lower surface of the anode terminal 7 and the cathode terminal 8 and a side surface exposed from the exterior resin 6 are plated. Has been. The capacitor element 1 shown here has a structure as shown in FIG. 4, for example. That is, the cathode portion 4 including the dielectric film layer 3, the cathode layer 41, and the cathode lead layer 42 is sequentially laminated on the peripheral surface of the anode body 22 on which the anode lead 21 is planted. These anode lead 21, anode body 22, dielectric film layer 3, cathode layer 41, and cathode lead layer 42 can be made of various known materials, and dielectric film layer 3, cathode layer 41, cathode lead layer. 42 may be formed of a single layer or a plurality of layers. Here, as the capacitor element 1, it is not always necessary to use the anode body 22 in which the anode lead 21 is planted as described above. For example, a foil-like element such as an aluminum foil may be used.

以下陽極リード２１をコンデンサ素子１の陽極部２、陰極層４１及び陰極引出層４２をコンデンサ素子の陰極部４として説明する。   Hereinafter, the anode lead 21 will be described as the anode portion 2 of the capacitor element 1, and the cathode layer 41 and the cathode lead layer 42 will be described as the cathode portion 4 of the capacitor element.

コンデンサ素子１の陽極部２と陽極端子７、陰極部４と陰極端子８は夫々接続されている。該陽極端子７は立ち上がり部７１を有しており、立ち上がり部７１で陽極部２と陽極端子７とは接続されている。この陽極端子７の形状は、特に図１に示す形状に限るものではなく、例えば陽極部２と直接接続するのに十分な高さを有する陽極端子７を用いてもよいし、図２に示すように導電部材９を介して接続していてもよい。   The anode part 2 and the anode terminal 7 and the cathode part 4 and the cathode terminal 8 of the capacitor element 1 are connected to each other. The anode terminal 7 has a rising portion 71, and the anode portion 2 and the anode terminal 7 are connected by the rising portion 71. The shape of the anode terminal 7 is not particularly limited to the shape shown in FIG. 1. For example, the anode terminal 7 having a sufficient height to be directly connected to the anode portion 2 may be used, as shown in FIG. In this way, they may be connected via the conductive member 9.

陰極端子８には段部が設けられており、陰極部４は陰極端子８の上段部８１と接続されている。該陰極端子８の下段部８２は外装樹脂６から露出しており、下段部８２の上面は外装樹脂の下端面と略同一平面上に位置している。   The cathode terminal 8 is provided with a step portion, and the cathode portion 4 is connected to the upper step portion 81 of the cathode terminal 8. The lower step portion 82 of the cathode terminal 8 is exposed from the exterior resin 6, and the upper surface of the lower step portion 82 is located on substantially the same plane as the lower end surface of the exterior resin.

また、陽極端子７及び陰極端子８の下段部８２は夫々コンデンサ素子１の陽極部２と陰極部４が連なる方向について、外装樹脂６から突出しており、該突出した側面にはメッキ処理が施されている。このような構成とすることで、固体電解コンデンサを基板に実装する際、半田フィレットを容易に確認することができる。
（実施形態２）
本発明の第２の実施形態は図２に示す通りである。図２の固体電解コンデンサは、コンデンサ素子１と外装樹脂６と、陽極端子７と、陰極端子８を具えている。コンデンサ素子１の構成は図１の実施の形態と同様に図４に示す構造から成る。該コンデンサ素子１の陽極部２は導電部材９を介して陽極端子７と、陰極部４は陰極端子８と夫々接続されている。ここで、導電部材９の形状・材質等は特に限定されず、陽極部２及び陽極端子７と抵抗溶接等の手法で接続でき、導電性をもつものであればよい。 Further, the lower part 82 of the anode terminal 7 and the cathode terminal 8 protrudes from the exterior resin 6 in the direction in which the anode part 2 and the cathode part 4 of the capacitor element 1 are connected, and the protruding side surfaces are plated. ing. With such a configuration, the solder fillet can be easily confirmed when the solid electrolytic capacitor is mounted on the substrate.
(Embodiment 2)
The second embodiment of the present invention is as shown in FIG. The solid electrolytic capacitor in FIG. 2 includes a capacitor element 1, an exterior resin 6, an anode terminal 7, and a cathode terminal 8. The configuration of the capacitor element 1 has the structure shown in FIG. 4 as in the embodiment of FIG. The anode part 2 of the capacitor element 1 is connected to an anode terminal 7 via a conductive member 9, and the cathode part 4 is connected to a cathode terminal 8. Here, the shape, material, and the like of the conductive member 9 are not particularly limited as long as they can be connected to the anode portion 2 and the anode terminal 7 by a technique such as resistance welding and have conductivity.

前記陰極端子８には段部が設けられており、上段部８１にて陰極端子８はコンデンサ素子１の陰極部４と接続されており、下段部８２は、外装樹脂６から露出している。ここで、下段部８２の上面と、外装樹脂６の下端面と、陽極端子７の上面とは略同一平面を形成している。また上段部８１からは、コンデンサ素子１の陽極部２と陰極部４が連なる方向に略垂直方向に立ち上がり部８３を有している。図２の固体電解コンデンサをＸ方向から見たときの透視図を図３に示す。   The cathode terminal 8 is provided with a step portion. The cathode portion 8 is connected to the cathode portion 4 of the capacitor element 1 at the upper step portion 81, and the lower step portion 82 is exposed from the exterior resin 6. Here, the upper surface of the lower step portion 82, the lower end surface of the exterior resin 6, and the upper surface of the anode terminal 7 form substantially the same plane. Further, the upper stage portion 81 has a rising portion 83 in a direction substantially perpendicular to the direction in which the anode portion 2 and the cathode portion 4 of the capacitor element 1 are connected. A perspective view of the solid electrolytic capacitor of FIG. 2 as viewed from the X direction is shown in FIG.

該立ち上がり部８３は、コンデンサ素子１の陰極部４と接続している。これにより、陰極部４と陰極端子８の接触面積が増大し、固体電解コンデンサのＥＳＲの低減に寄与する。陰極部４と陰極端子８との接触面積をさらに大きくさせるため、図２に示すように、立ち上がり部８３は延在部８３ａを有している。該延在部８３ａの延在方向は特に限定されないが、立ち上がり部８３が上段部８１の陽極端子７から最も近い箇所から立ち上がっている場合、陰極部４方向に延在していることが好ましい。上述のように延在部８３を設けることで、コンデンサ素子１と陰極端子８との接触面積が増大し、コンデンサのＥＳＲ低減に寄与する。   The rising portion 83 is connected to the cathode portion 4 of the capacitor element 1. Thereby, the contact area of the cathode part 4 and the cathode terminal 8 increases, and it contributes to reduction of ESR of a solid electrolytic capacitor. In order to further increase the contact area between the cathode portion 4 and the cathode terminal 8, the rising portion 83 has an extending portion 83a as shown in FIG. The extending direction of the extending portion 83a is not particularly limited. However, when the rising portion 83 rises from a position closest to the anode terminal 7 of the upper step portion 81, the extending portion 83a preferably extends in the direction of the cathode portion 4. By providing the extending portion 83 as described above, the contact area between the capacitor element 1 and the cathode terminal 8 is increased, which contributes to the ESR reduction of the capacitor.

また、本実施の形態も、実施の形態１と同様に陽極端子７と陰極端子８の下段部８２は、コンデンサ素子１の陽極部２と陰極部４が連なる方向について、夫々外装樹脂から突出している。このため、基板実装の際、半田フィレットが容易に確認できると共に、基板とコンデンサとの密着性が向上する。   Further, in the present embodiment, similarly to the first embodiment, the lower stage portion 82 of the anode terminal 7 and the cathode terminal 8 protrudes from the exterior resin in the direction in which the anode portion 2 and the cathode portion 4 of the capacitor element 1 are connected. Yes. For this reason, when the substrate is mounted, the solder fillet can be easily confirmed, and the adhesion between the substrate and the capacitor is improved.

図２の固体電解コンデンサにおいても、陽極端子７及び陰極端子８の下段部８２は夫々コンデンサ素子１の陽極部２と陰極部４が連なる方向について、外装樹脂６から突出しており、該突出した側面にはメッキ処理が施されている。このような構成とすることで、固体電解コンデンサを基板に実装する際、半田フィレットを容易に確認することができる。上記実施の形態は、本発明を説明するためのものに過ぎず、特許請求の範囲に記載の発明を限定する様に解すべきでない。本発明は、特許請求の範囲内及び均等の意味の範囲内で自由に変更することができる。   Also in the solid electrolytic capacitor of FIG. 2, the lower portion 82 of the anode terminal 7 and the cathode terminal 8 protrudes from the exterior resin 6 in the direction in which the anode portion 2 and the cathode portion 4 of the capacitor element 1 are connected. Has been plated. With such a configuration, the solder fillet can be easily confirmed when the solid electrolytic capacitor is mounted on the substrate. The above embodiments are merely for explaining the present invention, and should not be construed as limiting the invention described in the claims. The present invention can be freely modified within the scope of the claims and the scope of equivalent meanings.

１． コンデンサ素子
１． 陽極部
２１．陽極リード
２２．陽極体
３． 誘電体皮膜層
４． 陰極部
４１．陰極層
４２．陰極引出層
６． 外装樹脂
７． 陽極端子
８． 陰極端子
９． 導電性部材 1. Capacitor element 1. Anode section 21. Anode lead 22. 2. Anode body 3. Dielectric film layer Cathode part 41. Cathode layer 42. 5. Cathode extraction layer Exterior resin7. Anode terminal 8. 8. Cathode terminal Conductive member

Claims (2)

陽極部及び陰極部を具えたコンデンサ素子と、該陽極部と電気的に接続されている陽極端子と、該陰極部と電気的に接続されている陰極端子と、前記コンデンサ素子を被覆する外装樹脂とを具える固体電解コンデンサにおいて、
前記陰極端子は、上段部と下段部と側部とを有し、
前記上段部は、前記陰極部と接続され、
前記下段部は、前記外装樹脂から露出し、
前記側部は、前記上段部から前記陰極部の側面に沿って延在するとともに、該側面と接続され、
前記陽極端子および陰極端子が並ぶ方向において、前記側部の長さは、前記上段部の長さよりも長いことを特徴とする固体電解コンデンサ。 Capacitor element having an anode part and a cathode part, an anode terminal electrically connected to the anode part, a cathode terminal electrically connected to the cathode part, and an exterior resin covering the capacitor element In a solid electrolytic capacitor comprising
The cathode terminal has an upper stage, a lower stage and a side part,
The upper stage part is connected to the cathode part,
The lower step is exposed from the exterior resin,
The side portion extends along the side surface of the cathode portion from the upper stage portion, and is connected to the side surface,
In the direction in which the anode terminal and the cathode terminal are arranged, the length of the side portion is longer than the length of the upper stage portion. 前記上段部の上面は、前記陰極部の下面と接続され、
前記下段部の下面は、前記外装樹脂から露出し、
前記下段部の上面の少なくとも一部は、外装樹脂を介して前記陰極部の下面の一部と対向することを特徴とする請求項１に記載の固体電解コンデンサ。 The upper surface of the upper part is connected to the lower surface of the cathode part,
The lower surface of the lower step portion is exposed from the exterior resin,
2. The solid electrolytic capacitor according to claim 1, wherein at least a part of the upper surface of the lower step part faces a part of the lower surface of the cathode part through an exterior resin.
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