JPS6074424A - Method of producing condenser - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a capacitor packaged using a laminate film containing a heat-sealable resin film for capacitor elements.

Conventionally, for example, an electrolytic capacitor packaged with a laminated film made of capacitor material is made of an aluminum foil anode foil with a roughened surface and a chemical conversion film, and one with a mower attached to the end of the lead wire and a cathode foil made of roughened aluminum foil. A lead wire terminal was attached to this and two pairs were made into spacers and wound to form a capacitor element.) The capacitor element was crushed to obtain a flat capacitor element. This flat capacitor element was impregnated with driving electrolyte and then housed in a three-layer laminate film made of heat-sealable resin film, aluminum foil, polyester film, etc., and the laminate film was sealed by heat-pressing. . However, when an electrolytic capacitor with the above structure is wound, the position of the wire terminals may vary, and the lead wire terminals, especially the round aluminum wires, may become uneven after the laminate film is heated and crimped. The heat-fusible resin may melt and escape at the connection part between the laminate film and the lead wire, and the aluminum foil in the laminate film may come into contact with the lead wire terminal. There was a problem in that if it came into contact with the aluminum foil in the film, it would cause a short circuit.

In addition, since the means of forming the capacitor element is winding, there is a natural limit to the size of the anode and cathode foils that can be wound. The dimensions of the crushed capacitor element are width 4.4 × length 3 ×
The thickness will be 1.2 dragons. Therefore, if you are trying to obtain a capacitor paper with a small capacity below this size, increase the anode foil's formation voltage and reduce the capacitance per unit area until the aluminum foil size reaches the above-mentioned size. There was a constraint that it had to be made thicker. As described above, conventional capacitors packaged with a laminate film having a circular cutout have the disadvantage that there is a limit to miniaturization, and in the case of a small capacity, the capacitor cannot be miniaturized according to the capacity. Furthermore, since the capacitor element is obtained by crushing the wound body, there is a limit to how thin it can be, and this, together with the fact that the crushed capacitor element returns to its original shape and becomes a repulsive chip, hinders the promotion of thinner designs. Ta.

The present invention has been made to eliminate the above-mentioned drawbacks.The present invention has a structure in which a thin film is formed on the anode foil or the cathode foil and spacers such as capacitor paper are omitted, so the process is simplified, automation is easy, and short circuits occur. It is an object of the present invention to provide a method for manufacturing a capacitor that can be made smaller and thinner by reducing the cost. This will be explained below with reference to the drawings. As shown in Figure 1, the aluminum foil is roughened and formed into a chemical conversion film to form a rectangular electrode foil (1), and a cut (
2) As shown in Fig. 2, the second set is folded back from the notch 121 in the opposite direction to form a drawer part (31) protruding from the other side.The drawer part (3) is made of nickel silver, nickel, iron, copper, etc. It is possible to solder external terminals made of thin plates or foil (4
) Connect by chemical, ultrasonic, or laser welding, cold welding, or caulking, and apply an insulating material (5) such as resin or glass to the joint and harden it. Also the third
As shown in the figure, the aluminum foil is roughened and a cut (7) is made from the - side of the rectangular opposing lightning pole foil (6).
The lead-out part (8) is formed by folding back in the same manner as above, but the remaining part of the counter electrode foil (6) after removing the notch (7) is placed in the mold +
lol? ? 3 [1] The cut (2) of the electrode foil (1) has a length approximately twice as long as the remaining portion of the electrode foil (2) to be sandwiched from both the upper and lower surfaces. An external terminal (9) that can be soldered is also connected to the lead-out part (8) of the counter electrode foil (6) as in the case of the electrode foil IL+ described above, and an insulator (10) is applied to the connection part. Let it harden. Next, as shown in FIG.
A thin film (11) made of microporous, semipermeable, ion conductive, etc. or bulb fiber is formed on 11, and the remaining portion of the counter electrode foil (6) is folded in half in the length direction, and the electrode is attached to the inner surface of the foil. Foil (1)? Sandwich capacitor element (1
2) Configure '9. Therefore, the capacitor element (12
) is a counter current 4fit ? through the thin film (11) formed on both sides of the electrode foil (1). ? '+ (61 is arranged facing each other and has a structure 7 in which an external terminal (3) and an external terminal (7) are drawn out from the same end face. When this thin film (IJ) is impregnated with impregnation cutout, the fifth For example, an ionomer as shown in the figure.

A capacitor element (16) is placed inside a laminate film (16) consisting of a heat-fusible resin film (13) made of polyethylene, polyamide, etc. + aluminum foil (14) + an exterior film (15) of polyester, vinylidene chloride, fluorine resin, etc. 12)'%: Accommodating said laminated film (16)
Thermal adhesiveness (resin film (13)) Heat and press the open part so that the resin film (13) fits together and heat and press the heat adhesive resin film (13).
By Y-bonding, a flat rectangular capacitor element as shown in Figure 6 can be made. In the above, we have described the case where the thin film (11) is formed on the chemical electrode foil +1+, but the same effect can be obtained even if it is formed on the counter electrode foil (6). 6) may be formed in both. For example, the formation of microporous, semipermeable, and ionic conductive thin films is described in Japanese Patent Publication No. 43-8069, 2% Publication No. 50-2
It is described in Japanese Patent Publication No. 8636, Japanese Patent Publication No. 51-3904, etc., and forming a thin film consisting of a pulp fiber layer containing pulp fibers and a driving electrolyte is described in Japanese Patent Publication No. 57, No.
There are those described in Publication No.-38019.

Next, examples of electrolytic capacitors will be described.

Synthetic skin of gy with rough surface 1&G y generated 0,1
A square shape of 11 m thick aluminum foil (Y3 x 4 mm) and a notch of 1 square width x 2 lengths were made on one side of the square, and a drawer part was formed by folding back from the notch in the opposite direction to form a protruding part, as shown in Figure 1. You can make an anode foil like the one shown. Q in the drawer part,
An external cathode made of nickel silver with a thickness of 1 m++ thickness x 1 thickness and width of 1 to a length of appropriate length is connected by spot welding with a terminal flame, and polyethylene glycol is added to the dissolved synthetic resin solution. The mixture e was applied to a blank anode foil, passed through a steam atmosphere, and then immersed in water and dried to a thickness of 201 Lm.
A microporous thin film was formed. In addition, the aluminum foil with a thickness of 0.05 mm was roughened to form a surface of 3 my x 8 as shown in Figure 3.
An external cathode terminal made of nickel silver similar to the one connected to the anode foil is connected to the cathode foil which is folded in the opposite direction from the notch formed in the square shape and 11111II width x 2 length and provided with a drawer part. The positive foil 0) The upper and lower surfaces were covered with the negative electrode foil, and the external anode terminal and external cathode terminal were drawn out from the same end surface. Then, impregnate the capacitor element with the driving electrolyte. Therefore, the capacitor element is 4 my X 3 + 11 J X 0.25.
It has the same dimensions as mine, and the outer end of the mower is pulled out from this structure. The capacitor element was placed on the ionomer side fat film of a three-layer laminate film consisting of an ionomer resin film (thickness 0.151+l + aluminum foil (thickness Q, Q2mm) and a polyester film (thickness 80-013+ui), Fold back and read the fifth
The dimensions of the capacitor obtained by encasing the capacitor element as shown in the figure, heating and crimping the periphery of the capacitor element, welding and sealing the ionomer resin film, and cutting off unnecessary parts are: width 5II 11 x height 4.5 fins x thickness Q. With the external terminal drawn out from the 7-pin, the volume is 15.8 mm, and the capacitance obtained by λt is 3.71=F. In the case of a conventional wound type θ) element, it must be housed in a case of 3 myφ×5mffff1, and this volume is 35.3 yhm”, so this embodiment has a 45% σ) compared to the conventional one. It has only volume 5
Can you reduce the volume by 5%? The minimum case diameter for conventional wound-type capacitors is 3 muφ, and the rated value for capacitor elements packaged with crushed wound-type capacitors using laminate film is 6.3 mm.
WV' -3.7 pF The thickness is 1.5 mm, but in the case of the present invention, the thickness can be reduced to 0.7 m11, which has the advantage of being much thinner than the conventional one. In addition, in the conventional method, a short circuit 2 occurred due to contact between the aluminum foil in the laminate film and the external terminal due to escape of the heat-fusible resin of the laminate film due to heating and pressure bonding during sealing, but according to the present invention, short circuit 2 occurred due to contact between the external terminal and the aluminum foil in the laminate film. The thickness when stacked with the electrode foil and counter electrode foil is 0.2111 or less, which is thinner than the thickness of the heat-fusible resin film, which is 0.3II11, so that the heat-fusible resin can be easily bonded by heating and pressure bonding. Even if the terminal escapes, a short circuit due to contact with the external terminal 1 will not occur. Furthermore, in the above embodiment, a case was described in which the external terminals were pulled out from the same direction, but the electrode foil (21) and the notch (22)' as shown in FIG.
fX-provided fold-back drawer part (23)'? By combining the shaded material with the counter electrode foil (6) shown in FIG. 3, an electrolytic continuum with external terminals in opposite directions can be obtained.

In addition, in the embodiment, the pull-out part is formed by folding back in the opposite direction of the notch, but if the structure is folded back at right angles to the notch as shown in FIGS. 8 and 9, the external terminal can be You can also pull it out from the same direction. As described above, in the present invention, by changing the direction of the cut and the folding, the external terminal can be drawn out in any direction. In addition, cutting, folding back, and connecting external terminals in electrode foil and counter electrode foil can be easily automated by making two cuts, folding them back in the next process, connecting external terminals, and then cutting them individually. . In the example, a three-layer adhesive film in which aluminum foil was inserted into a laminate film was described, but this was done in consideration of the permeability of the impregnating agent such as the driving electrolyte.
Depending on the impregnating agent used, it may be a 2- to 4-layer resin film. In addition, although an example in which the thin film is formed and then impregnated with an impregnating agent has been described, a method of forming a thin film containing an impregnating agent such as a driving electrolyte and eliminating the need for an impregnating step is also within the scope of the present invention.
It is a t-ro technology.

[Brief explanation of the drawing]

The drawings also show examples of the present invention, and FIG. 1 is a plan view showing the state in which notches are provided in the electrode foil, FIG. 2 is a plan view showing the state in which external terminals are connected to the electrode foil, and FIG. Figure 3 is a plan view showing the state in which the external terminal 1 is in contact with the counter electrode foil, Figure 4 is a side cross-sectional view of the ~ section for explaining the structure of the capacitor element, and Figure 5 is the capacitor element housed in the laminate film. Fig. 6 is a perspective view of the completed rectangular electrolytic capacitor element, Fig. 7 is a plan view showing the embodiment of the electrode foil with a cut (la), and Fig. 8 is a plan view showing the electrode foil. +7) A plan view showing another embodiment, FIG. 9 is a plan view showing another embodiment of the counter electrode foil. +1)・・・Denyu basket (2)・・・Notch (3
)...Drawer part (4)...External terminal (5)...
...Insulator (6) ...Counter electrode foil (7)
...Notch (8)...Drawer part (9)...
...External terminal (10)...Insulator (11)...
... Thin film (12) ... Capacitor element (13
◇・・・・Heat-fusible resin film (14)・・・・
Aluminum foil (15)... Exterior film (16)
····Laminate film. Patent Applicant Marukon Electronics Co., Ltd. Figure 2

Claims (1)

[Scope of Claims] (1) A step in which the incisions provided in the rectangular electrode foil and the counter electrode foil are folded back to form a drawer portion, and an external terminal is connected to each of the drawer portions, and the connecting portion is covered with an insulating material. a step of forming a thin film on the electrode foil and/or a counter electrode foil; a step of sandwiching the electrode foil with a counter electrode foil after the step to form a capacitor element; and impregnating the thin film with an impregnating agent. 7, and after the step, the capacitor element ? A method for producing a capacitor, which comprises the steps of accommodating the capacitor in a laminate film and adhering the laminate film. (2) The method for manufacturing a capacitor according to claim (1), characterized in that the notch is formed vertically or horizontally from one side of the rectangle, and the fold is made at right angles to or in the opposite direction to the notch. (3) Claims (1) or (2) characterized in that the external terminal is made of a solderable metal thin plate or metal foil such as nickel silver, nickel, iron, or copper. manufacturing method for capacitors. (4) If the insulator is resin, glass, etc., apply it and cure it (
5) Any one of claims (1) to (4), characterized in that the thin film is a microporous, semipermeable, ionoconductive thin film layer that is a pulp fiber layer. The manufacturing method of the capacitor described in . (6) The method for manufacturing a capacitor according to any one of claims (1) to (5), characterized in that the thin film contains a driving electrolyte. (7) Claims (1) to (6) characterized in that the laminate film is composed of a laminate of a heat-fusible resin film and an exterior film, and the heat-fusible resin films are bonded together. A method for manufacturing a capacitor according to any one of Items i't. (8) Claims characterized in that the heat-fusible resin film is made of one of ionomer, polyethylene, and polyamide, and the exterior film is made of one of polyester, vinylidene chloride, and fluororesin. A method for manufacturing a capacitor according to paragraph (7). (9) Any one of claims (1) to (7) characterized in that it is made of a laminate film or a heat-fusible resin film and an exterior film with an aluminum foil inserted between them. A method for manufacturing a capacitor as described in .