JP4338179B2 - Manufacturing method of aluminum solid electrolytic capacitor - Google Patents

Description

【００７４】
表１に示すように、従来の固体電解コンデンサに用いられていたアルミニウム箔で作製した比較例５のコンデンサは、コンデンサ素子を２枚積層させたため、ＥＳＲが高く、また、アルミニウム箔に形成させたエッチング層が片面あたり７０μｍ未満の比較例１及び比較例２では、静電容量が低く、ＥＳＲが高く、また、アルミニウム箔の板厚が１５０μｍ未満あるいは５００μｍ超の比較例１、比較例３及び比較例４では、加工時の機械的なストレスによりＬＣが高くなってしまった。
【００７５】
これに対して、本発明の実施例１〜５のコンデンサは、コンデンサ素子１枚でも高い静電容量が得られ、ＥＳＲ及びＬＣが低いことがわかる。
【００７６】
【発明の効果】
本発明のアルミニウム固体電解コンデンサは、平板状アルミニウム箔の板厚が１５０〜５００μｍであり、また、該箔の表面に、片面あたり７０μｍ以上かつ該箔の板厚の１／２未満となるエッチング層が形成されており、該コンデンサは、静電容量が大きく、漏れ電流が小さい特性を有する。また、該エッチング層上に固体電解質層として導電性高分子を形成させることにより、ＥＳＲが低い優れた特性のコンデンサが得られる。
【００７７】
また、本発明のコンデンサの製造方法によれば、コンデンサ素子の静電容量が大きいことから、従来に比べて素子の積層枚数を少なくでき、組立工程が簡便で、材料費、組立加工費の低減が可能である。
【図面の簡単な説明】
【図１】アルミニウム固体電解コンデンサの構成を示す概略断面図であって、（ａ）は、該コンデンサの概略断面図であり、また（ｂ）は、該コンデンサの平板状コンデンサ素子部の概略断面図である。
【図２】積層型アルミニウム固体電解コンデンサの構成を示す概略断面図である。
【図３】平板状アルミニウム箔表面に、絶縁性樹脂により複数のマス目を形成させた模式図である。
【符号の説明】
１ 平板状アルミニウム箔
２ エッチング層
３ 導電性高分子層
４ 陰極導電層
５ 陽極引き出し部
６ 陽極用金属ワイヤ
７ 陽極端子
８ 銀ペースト
９ 陰極用金属ワイヤ
１０ 陰極端子
１１ 外装樹脂
１２ 絶縁性樹脂[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chip-type aluminum solid electrolytic capacitor and a method for manufacturing the same, and more specifically, a dielectric oxide film and a conductive polymer layer are sequentially formed on the surface of a flat aluminum foil having an etching layer formed on both sides. The present invention also relates to a solid electrolytic capacitor formed with a cathode conductive layer and a method for manufacturing the same.
[0002]
[Prior art]
Conventionally, an aluminum solid electrolytic capacitor using a conductive polymer as a solid electrolyte has been proposed, and the capacitor using a conductive polymer having high electrical conductivity and excellent heat resistance has a low electrical resistance. In addition, it is a capacitor with excellent characteristics that can be surface-mounted (for example, see Patent Document 1).
[Patent Document 1]
Japanese Patent Laid-Open No. 5-159983
A general chip-type aluminum solid electrolytic capacitor will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the configuration of an aluminum solid electrolytic capacitor. FIG. 1A is a schematic cross-sectional view of the entire capacitor, and FIG. 1B is a flat capacitor element of the capacitor. The schematic sectional drawing of a part is shown. FIG. 2 is a schematic cross-sectional view showing the configuration of the multilayer aluminum solid electrolytic capacitor.
[0004]
In FIG. 1, an aluminum solid electrolytic capacitor having a chip-type structure has an etching layer 2 formed on the surface of a flat aluminum foil 1, and a dielectric oxide film, a conductive polymer layer 3 and The cathode conductive layer 4 is formed to obtain a capacitor element, and then the anode lead portion 5 of the element is joined to the anode terminal 7 of the lead frame via the anode metal wire 6, and the lower surface of the cathode conductive layer 4 is The upper surface of the conductive layer is connected to the cathode terminal 10 of the lead frame by the silver paste 8 and the cathode metal wire 9, and then the exterior resin 11 is applied.
[0005]
As shown in FIG.1 (b), the flat aluminum foil 1 used for the said general capacitor | condenser is about 90-110 micrometers in plate | board thickness, and the etching layer 2 and center part of 30-40 micrometers on both surfaces of this foil are used. An aluminum core having a thickness of about 30 μm is formed.
[0006]
When the thickness of the aluminum foil is larger than the range of 90 to 110 μm, cracking occurs when wound in the use of a winding capacitor, and when the foil is thinner than the range, The thickness becomes less than about 30 μm, the tensile strength becomes weak, and inconveniences such as breakage occur when wound.
[0007]
Even in a chip-type aluminum solid electrolytic capacitor, since a general-purpose aluminum foil is inexpensive, an aluminum foil having a plate thickness of 90 to 110 μm is used as in the case of a wound type. The capacitor had a small electrostatic capacity, and in order to obtain a large-capacitance capacitor, it was manufactured by laminating two capacitor elements as shown in FIG.
[0008]
However, the multilayer capacitor is complicated to assemble, and the capacitor elements are bonded and laminated with silver paste, so that the contact resistance of the conductive layer between the silver paste as the conductive portion and the capacitor element increases. The problem to be solved remains that the equivalent series resistance (hereinafter abbreviated as “ESR”) becomes high.
[0009]
As another method for increasing the electrostatic capacity, a method of increasing the surface of the foil by increasing the thickness of the aluminum foil and increasing the thickness of the etching layer can be considered, but if the etching layer is formed thicker, Since the distance between the aluminum core portion and the cathode conductive layer is increased and the resistance component of the solid electrolyte layer formed on the etching layer is increased, the ESR of the obtained capacitor is increased and practical application is difficult. .
[0010]
[Problems to be solved by the invention]
An object of the present invention is to provide an aluminum solid electrolytic capacitor having a large capacitance, excellent capacitor characteristics such as ESR, and a simple assembly process, and a method for manufacturing the same.
[0011]
[Means for Solving the Problems]
As a result of intensive studies, the inventors have controlled the thickness of the flat aluminum foil used for the aluminum solid electrolytic capacitor and the thickness of the etching layer to a specific range, and formed a conductive polymer as the solid electrolyte. As a result, it has been found that the above problems can be solved, and the present invention has been completed.
[0012]
That is, the present invention provides an aluminum solid electrolytic capacitor in which a dielectric oxide film, a conductive polymer layer, and a cathode conductive layer are sequentially formed on the surface of a flat aluminum foil having an etching layer formed on both sides. An aluminum solid electrolytic capacitor characterized in that the thickness of the foil is 150 to 500 μm, and the thickness of the etching layer per one side of the foil is 70 μm or more and less than ½ of the thickness of the foil. is there.
[0013]
In the present invention, the thickness of the etching layer per one side of the foil is 70 μm after masking with an insulating resin leaving a plurality of squares on both sides of a flat aluminum foil having a thickness of 150 to 500 μm. After the etching layer is formed in the grid so as to be less than 1/2 the thickness of the foil, a dielectric oxide film, a conductive polymer layer, and a cathode conductive layer are sequentially formed on the surface of the etching layer. Forming a conductive layer and then separating each cell to obtain a capacitor element; joining the capacitor element to a lead frame having an anode terminal and a cathode terminal; and molding the exterior resin. This is a method for producing an aluminum solid electrolytic capacitor.
[0014]
Hereinafter, the aluminum solid electrolytic capacitor of the present invention will be described in detail with reference to FIG. 1 and FIG. In addition, this invention is not limited at all by drawing.
[0015]
In the aluminum solid electrolytic capacitor of the present invention, the etching layer 2 is 70 μm or more per side of the foil and less than ½ of the thickness of the foil on the surface of the flat aluminum foil 1 having a thickness of 150 to 500 μm. A dielectric oxide film, a conductive polymer layer 3 and a cathode conductive layer 4 are sequentially formed on the etching layer to obtain a capacitor element, and then the anode lead portion 5 of the element is connected to the anode After joining to the anode terminal 7 via the metal wire 6 for connecting, the lower surface of the cathode conductive layer 4 is connected with the silver paste 8 and the upper surface of the conductive layer is connected to the cathode terminal 10 via the metal wire 9 for cathode It is obtained by applying the exterior resin 11.
[0016]
The plate thickness of the flat aluminum foil 1 used for the aluminum solid electrolytic capacitor of the present invention is 150 to 500 μm, and the thickness of the etching layer 2 per one side of the foil is 70 μm or more and 1 of the plate thickness of the foil. Less than / 2.
[0017]
In general, by forming the etching layer 2 of the flat aluminum foil 1 thickly, the surface of the foil is enlarged and a capacitor having a large capacitance can be obtained. However, the thickness of the foil is less than 150 μm. Forming an etching layer of 70 μm or more on one side of the foil is disadvantageous because the aluminum core of the foil becomes thin, the mechanical strength is lowered, and it is difficult to process in the mass production process.
[0018]
On the other hand, if the plate thickness of the flat aluminum foil 1 exceeds 500 μm, the processability and mass productivity of the foil cutting work and the like are inferior, and the leakage current of the capacitor increases due to the mechanical stress received at the time of cutting. It is.
[0019]
The thickness of the etching layer 2 formed on the surface of the flat aluminum foil 1 is 70 μm or more per side and less than ½ of the plate thickness of the foil, and the thickness of the etching layer 2 is less than 70 μm per side. In this case, the effect of improving the electrostatic capacity is small and inconvenient, and in the case of 1/2 or more of the thickness of the foil, the etching layer penetrates the flat aluminum foil 1 and mechanical strength is increased. Is inconvenient. Furthermore, if the thickness of the etching layer 2 is 250 μm or more per side, the distance between the core of the aluminum foil and the cathode conductive layer becomes long, which is disadvantageous in that ESR increases.
[0020]
As the solid electrolyte used in the aluminum solid electrolytic capacitor of the present invention, a conductive polymer having high electrical conductivity and excellent heat resistance is suitable.
[0021]
As described above, in a general solid electrolytic capacitor, when the etching layer of the aluminum foil is formed thick, the capacitance of the capacitor increases, but the distance from the aluminum core part of the anode to the cathode conductive layer becomes long, The resistance component of the solid electrolyte layer increases and the ESR of the capacitor increases. However, by using a conductive polymer with high electrical conductivity as the solid electrolyte, the ESR does not increase even in a thick etching layer of about 250 μm, A low ESR capacitor is obtained.
[0022]
Examples of the conductive polymer include thiophene derivative polymers such as polypyrrole, polyaniline, polyfuran, polyacetylene, polythiophene, or poly (alkylthiophene), and the like, and by a conventionally known method such as a chemical polymerization method and / or an electrolytic polymerization method. Let it form.
[0023]
Hereafter, the manufacturing method of the aluminum solid electrolytic capacitor of this invention is demonstrated in detail with reference to FIG.1, FIG.2 and FIG.3. FIG. 3 is a schematic view in which a plurality of cells are formed of an insulating resin on the surface of the flat aluminum foil.
[0024]
First, as shown in FIG. 3, masking is performed on both surfaces of a flat aluminum foil 1 having a plate thickness of 150 to 500 μm with an insulating resin 12 leaving a plurality of cells to be capacitor element forming portions, Each square where the aluminum metal part is exposed is etched, and the surface of the foil 1 is etched so that the thickness of the etching layer per side is 70 μm or more and does not exceed 1/2 of the thickness of the foil. .
[0025]
As the insulating resin 12 used for the masking, an epoxy resin, a phenol resin, a polyester resin, a silicon resin, or the like can be used, which is coated by a coating method or screen printing.
[0026]
In addition, the etching to the aluminum metal surface in each square can be performed by a conventionally known electrochemical alternating current etching method and direct current etching method, but the alternating current etching method is more preferable because it can increase the capacitance of the capacitor. .
[0027]
Next, the conductive polymer layer 3 is formed as a solid electrolyte in each square where the etching layer is formed.
[0028]
As the conductive polymer, polypyrrole formed by electrolytic polymerization is preferable. Since the polypyrrole has high conductivity, ESR does not increase even when the etching layer is formed to a thickness of about 250 μm. As a method for forming the electropolymerized polypyrrole, a conductive precoat layer is formed in the grid, and subsequently, the precoat layer is used as an electrode and electrolytic polymerization is performed between the external electrode.
[0029]
The precoat layer is formed by forming a conductive polymer layer such as polypyrrole by chemical polymerization or by dropping, washing, and drying a solvent-soluble conductive polymer solution into the cells.
[0030]
In addition, the electrolytic polymerization polypyrrole layer is obtained by immersing the foil on which the precoat layer has been formed in an electrolyte solution containing a pyrrole monomer and a dopant, bringing a conductor such as a stainless wire into contact with the precoat layer previously formed, It is formed by performing constant current electrolytic polymerization with an electrode for a predetermined time, and then washing and drying.
[0031]
Next, a carbon paste and a silver paste are applied to the foil, and heated and dried to form a cathode conductive layer 4 composed of a carbon layer and a silver layer.
[0032]
Next, as shown in FIG. 3, the obtained foil is cut along the dotted line in the figure, and the insulating resin portion formed around the grid is separated into a plurality of elements, and then each element is separated. A part of the insulating resin is peeled off to expose the aluminum metal to form the anode lead portion 5 of the capacitor element, thereby obtaining the flat capacitor element shown in FIG.
[0033]
As shown in FIG. 1A, the obtained flat capacitor element is placed on a metal lead frame having an anode terminal 7 and a cathode terminal 10, and the anode lead portion 5 is connected to the anode metal wire 6. The lower surface of the cathode conductive layer 4 is connected to the cathode terminal 10 by the silver paste 8 and the upper surface of the conductive layer is connected to the cathode terminal 10 via the cathode metal wire 9.
[0034]
Then, it shape | molds with exterior resin 11, such as an epoxy resin, a voltage is applied to both poles and it is made to age, and the aluminum solid electrolytic capacitor of this invention is completed.
[0035]
With the solid electrolytic capacitor of the present invention, a capacitor having a high capacitance can be obtained even with a single capacitor element. To obtain a capacitor with a higher capacitance, two capacitor elements are laminated as shown in FIG. Alternatively, or more layers may be laminated.
[0036]
In the aluminum solid electrolytic capacitor of the present invention, the plate thickness of the flat aluminum foil is 150 to 500 μm, and the etching layer on the surface of the foil is 70 μm or more per side and less than ½ of the plate thickness of the foil. The capacitor has a characteristic that the capacitance is large and the leakage current is small. Further, by forming a conductive polymer as a solid electrolyte layer on the etching layer, a capacitor having excellent characteristics with low ESR can be obtained.
[0037]
Further, according to the method for producing an aluminum solid electrolytic capacitor of the present invention, since the capacitance of the capacitor element is large, the number of stacked capacitor elements can be reduced as compared with the prior art, the assembly process is simple, the material cost, the assembly Processing costs can be reduced.
[0038]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the invention will be described based on examples. In the examples, “%” represents “% by mass”. In addition, this invention is not limited at all by the Example.
[0039]
Example 1
As shown in FIG. 3, an epoxy resin, which is an insulating resin 12, is applied to both sides of the flat aluminum foil 1 (width 32 mm × length 28 mm × plate thickness 200 μm), leaving a grid of width 3 mm × length 5 mm. And masked. The squares formed on the foil have a total of 50 rows in 10 rows and 5 columns.
[0040]
The foil was immersed in an etching solution and subjected to alternating current etching to form an etching layer in the grid. The thickness of the etching layer was 70 μm per side.
[0041]
In the above etching operation, 2% aluminum chloride and 8% hydrochloric acid solution are used as an etching solution, and energization is performed until an etching layer having a desired thickness is formed under conditions of a liquid temperature of 30 ° C., a frequency of 50 Hz, and a current of 0.15 A. Let it be processed.
[0042]
Subsequently, a chemical conversion treatment was carried out in an aqueous solution of ammonium adipate at a voltage of 10 V to form a dielectric oxide film on the surface of the etching layer in the grid.
[0043]
Next, an ethanol solution of 10% pyrrole monomer was dropped into each cell, 5% ammonium persulfate and 5% sodium 2-naphthalenesulfonate aqueous solution were dropped, and allowed to stand for 5 minutes for chemical polymerization, followed by washing. Then, a precoat layer made of chemically polymerized polypyrrole was formed in the grid.
[0044]
Next, the foil is immersed in an acetonitrile electrolyte containing 0.5 mol / l of pyrrole monomer and 0.3 mol / l of sodium 2-naphthalenesulfonate, and a stainless steel wire is formed on a part of the previously formed chemically polymerized polypyrrole layer. Contact is used as an anode, stainless steel plate is used as a cathode, constant current electropolymerization is performed under the conditions of a current of 0.5 mA per cell and electrolysis time of 60 minutes, then washed and dried, and then electropolymerized in the cells. A polypyrrole layer was formed.
[0045]
By this operation, the conductive polymer layer 3 composed of the chemically polymerized polypyrrole layer and the electrolytic polymerized polypyrrole layer is formed in each cell.
[0046]
Next, a carbon paste and a silver paste were applied on the conductive polymer layer 3 and dried by heating to form the cathode conductive layer 4.
[0047]
Next, using a dicer equipped with a diamond cutter blade, as shown in FIG. 3, the insulating resin portion formed around the square of the aluminum foil was cut along the dotted line, and the width was 3.2 mm × vertical A total of 50 5.6 mm flat capacitor elements were obtained.
[0048]
The epoxy resin formed on the longitudinal ends of the obtained element is peeled back and forth to expose the aluminum metal part and form the anode lead part 5 of the capacitor element to obtain the capacitor element shown in FIG. It was.
[0049]
As shown in FIG. 1A, the obtained capacitor element is placed on a metal lead frame having an anode terminal and a cathode terminal, and the anode lead portion 5 of the element is connected to a metal wire 6 for anode (100 μmφ). The gold terminal is connected to the anode terminal 7 by resistance welding, and then the lower surface of the cathode conductive layer 4 is coated with silver paste 8 and the upper surface of the conductive layer is bonded to the cathode terminal via the cathode metal wire 9. 10 connected.
[0050]
Then, it molded with the exterior resin 11 made from an epoxy resin, applied the voltage to both poles, and aged, and completed the aluminum solid electrolytic capacitor of rated voltage 6.3V.
[0051]
The obtained capacitor had a capacitance at 120 Hz (hereinafter abbreviated as “C”), an ESR at a frequency of 100 kHz, and a leakage current (hereinafter abbreviated as “LC”) after 1 minute after applying a voltage of 6.3 V. Table 1 shows the result of calculating the average value from the measured values of 50 capacitors subjected to the test.
[0052]
Example 2
In Example 1, an aluminum solid electrolytic capacitor was obtained according to Example 1 except that the thickness of the etching layer formed on the surface of the flat aluminum foil was 90 μm per side.
[0053]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0054]
Example 3
In Example 1, an aluminum solid electrolytic capacitor was fabricated according to Example 1 except that the thickness of the flat aluminum foil was 350 μm and the thickness of the etching layer formed on the surface of the foil was 100 μm per side. Obtained.
[0055]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0056]
Example 4
In Example 1, an aluminum solid electrolytic capacitor was fabricated according to Example 1 except that the thickness of the flat aluminum foil was 350 μm and the thickness of the etching layer formed on the surface of the foil was 170 μm per side. Obtained.
[0057]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0058]
Example 5
In Example 1, an aluminum solid electrolytic capacitor was fabricated according to Example 1, except that the thickness of the flat aluminum foil was 450 μm and the thickness of the etching layer formed on the surface of the foil was 220 μm per side. Obtained.
[0059]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0060]
Comparative Example 1
In Example 1, an aluminum solid electrolytic capacitor was fabricated according to Example 1 except that the thickness of the flat aluminum foil was 140 μm and the thickness of the etching layer formed on the surface of the foil was 65 μm per side. Obtained.
[0061]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0062]
Comparative Example 2
In Example 1, an aluminum solid electrolytic capacitor was fabricated according to Example 1 except that the thickness of the flat aluminum foil was 200 μm and the thickness of the etching layer formed on the surface of the foil was 60 μm per side. Obtained.
[0063]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0064]
Comparative Example 3
In Example 1, an aluminum solid electrolytic capacitor was fabricated according to Example 1 except that the thickness of the flat aluminum foil was 550 μm and the thickness of the etching layer formed on the surface of the foil was 100 μm per side. Obtained.
[0065]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0066]
Comparative Example 4
In Example 1, an aluminum solid electrolytic capacitor was fabricated according to Example 1 except that the thickness of the flat aluminum foil was 550 μm and the thickness of the etching layer formed on the surface of the foil was 270 μm per side. Obtained.
[0067]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0068]
Comparative Example 5
In Example 1, a plate-like capacitor element was prepared according to Example 1 except that the plate-like aluminum foil had a plate thickness of 110 μm and the thickness of the etching layer formed on the surface of the foil was 35 μm per side. Then, a multilayer capacitor in which two capacitor elements were laminated was produced by the method described below.
[0069]
First, the anode lead portion 5 of the capacitor element is connected to the anode terminal 7 by resistance welding via the anode metal wire 6 (100 μmφ gold wire), and then the lower surface of the cathode conductive layer 4 is bonded to the silver paste 8. Then, the upper surface of the conductive layer was connected to the cathode terminal 10 via the cathode metal wire 9 to join the first capacitor element.
[0070]
Next, as shown in FIG. 2, a silver paste 8 is applied to the upper surface of the cathode conductive layer 4 of the first capacitor element, and adhered to the lower surface of the cathode conductive layer 4 of the second capacitor element. Connected to the cathode terminal 10 via the cathode metal wire 9, and then connected to the anode terminal 7 by resistance welding to the anode terminal 7 via the anode metal wire 6 (100 μm gold wire). Two capacitor elements were laminated.
[0071]
Then, it molded with the exterior resin 11 made from an epoxy resin, applied voltage, and aged, and completed the laminated aluminum solid electrolytic capacitor of rated voltage 6.3V.
[0072]
C, ESR and LC of the obtained aluminum solid electrolytic capacitor were measured according to Example 1, and the results are shown in Table 1.
[0073]
[Table 1]

[0074]
As shown in Table 1, the capacitor of Comparative Example 5 made of an aluminum foil used for a conventional solid electrolytic capacitor had a high ESR because two capacitor elements were laminated, and was formed on an aluminum foil. In Comparative Example 1 and Comparative Example 2 in which the etching layer is less than 70 μm per side, Comparative Example 1, Comparative Example 3 and Comparative Example in which the electrostatic capacity is low, the ESR is high, and the thickness of the aluminum foil is less than 150 μm or more than 500 μm. In Example 4, LC became high due to mechanical stress during processing.
[0075]
On the other hand, it can be seen that the capacitors of Examples 1 to 5 of the present invention have a high capacitance even with one capacitor element, and have low ESR and LC.
[0076]
【The invention's effect】
In the aluminum solid electrolytic capacitor of the present invention, the plate thickness of the flat aluminum foil is 150 to 500 μm, and the etching layer on the surface of the foil is 70 μm or more per side and less than ½ of the plate thickness of the foil. The capacitor has a characteristic that the capacitance is large and the leakage current is small. Further, by forming a conductive polymer as a solid electrolyte layer on the etching layer, a capacitor having excellent characteristics with low ESR can be obtained.
[0077]
Further, according to the capacitor manufacturing method of the present invention, since the capacitance of the capacitor element is large, the number of stacked elements can be reduced compared to the conventional one, the assembly process is simple, and the material cost and assembly processing cost are reduced. Is possible.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view showing a configuration of an aluminum solid electrolytic capacitor, in which (a) is a schematic cross-sectional view of the capacitor, and (b) is a schematic cross-sectional view of a flat plate capacitor element portion of the capacitor. FIG.
FIG. 2 is a schematic cross-sectional view showing a configuration of a multilayer aluminum solid electrolytic capacitor.
FIG. 3 is a schematic view in which a plurality of grids are formed on the surface of a flat aluminum foil with an insulating resin.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flat aluminum foil 2 Etching layer 3 Conductive polymer layer 4 Cathode conductive layer 5 Anode lead-out part 6 Anode metal wire 7 Anode terminal 8 Silver paste 9 Cathode metal wire 10 Cathode terminal 11 Exterior resin 12 Insulating resin

Claims (2)

  After a plurality of squares are masked with an insulating resin on both sides of a flat aluminum foil having a thickness of 150 to 500 μm, the thickness of the etching layer per side of the foil is 70 μm or more and the foil plate After forming an etching layer in the grid so as to be less than 1/2 of the thickness, a dielectric oxide film, a conductive polymer layer, and a cathode conductive layer are sequentially formed on the surface of the etching layer, Next, an aluminum solid comprising a step of obtaining a capacitor element by separating each cell, a step of bonding the capacitor element to a lead frame having an anode terminal and a cathode terminal, and a step of molding with an exterior resin Manufacturing method of electrolytic capacitor. The conductive polymer layer is, after forming a conductive precoat layer on the dielectric oxide film, an aluminum solid electrolytic according to claim 1, characterized in that to form the electrolytic polymerization polypyrrole layer the precoat layer as an electrode Capacitor manufacturing method.

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