JPS603579Y2 - Electrolytic capacitor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a low impedance electrolytic capacitor in which the electrode extension part of a capacitor element is improved and a small capacity flat plate capacitor is provided in the electrode extension part.

Conventionally, a low impedance electrolytic capacitor constructed as shown in FIG. 1 is known.

That is, as shown in FIG. 1A, the anode foil 5 and the cathode foil 6 are shifted from each other and wound in a non-inductive manner with the electrolytic paper 10 in between, to produce the flat element 4.

Next, as shown in the opening of the same figure, the flat type elements 4 are stacked in plural, and the anode foil 5 is pressed onto the anode extraction electrode plate 1, and the cathode foil 6 is pressed onto the cathode extraction electrode plate 2, respectively, and liquid is supplied or soldered 7. Connect by.

At this time, the flat element 4 is attached to both sides of the electrode plates 1 and 2, as shown in the figure, and 3 is attached to both sides of the electrode plates 1 and 2.
This is an insulating separator such as a plastic film between the two.

In this configuration, the anode foil 5 has an oxide film formed on the foil, so when the capacitor element 4 is flattened or connected to the anode extraction electrode plate 1 by welding or the like, the oxide film may deteriorate or be damaged. Easy to increase leakage current.

Alternatively, since the electrolytic capacitor element 4 is flat, when multiple electrolytic capacitor elements 4 are stacked and attached to the electrode plate, the central part 4a of the element 4
This creates voids in the wafer, increasing tan δ or impedance, and necessitating the use of clamping hardware for the element.

The electrolytic solution impregnated in the capacitor element 4 adheres to the end face of the insulating separator 3 and causes the electrode plate 1 of the flat capacitor to
, and had many drawbacks, such as the tendency for current to flow between the two, resulting in an increase in leakage current.

The present invention eliminates the above-mentioned drawbacks, and will be explained with reference to an embodiment of the connection structure of an electrolytic capacitor element shown in FIG. Then, an electrolytic capacitor element 14 is made.

The electrode tab 8 is connected to the anode foil 5, the electrode tab 9 is connected to the cathode foil 6, and the electrode tab 8 is connected to the anode foil 5 as shown in the opening of FIG.
and 9 are pulled out in opposite directions.

Next, a plurality of electrolytic capacitor elements 14 are stacked one on top of the other so that the polarities of the electrode tabs are in the same direction, and are connected to the plate-shaped lead-out electrode plates 1 and 2, respectively.

That is, the electrode tab 8 is welded to the anode lead electrode plate 1, and the electrode tab 9 is welded to the cathode lead electrode plate 2.

3a is a sheet made of electrolytic paper or the like impregnated with an electrolytic solution, which is sandwiched between the extraction electrode plates 1 and 2.

Extracted electrode plate 1 sandwiching the sheet 3a impregnated with this electrolyte
．． 2 forms an electrolytic capacitor having small capacitance and low impedance characteristics.

A plurality of capacitor elements 14 are connected in parallel on both sides of the extraction electrodes 1 and 2, as shown in FIG.

However, if the rated capacity is small, it may be connected only to one side.

In FIG. 3A, the capacitor element 14 shown in FIG. 2 is connected to a pair of plate-shaped extraction electrode plates 1 and 2, and the terminal sealing plate 11
This is a perspective view of an electrolytic capacitor in the middle of assembly with screw-shaped terminals 1a and 2a attached to the cap, and an electrolytic capacitor in which an electrolytic capacitor element and a terminal sealing plate shown in FIG. 3A are sealed in an aluminum container 12.

In other words, in the present invention, when n electrolytic capacitor elements are connected in parallel, the impedance of the completed electrolytic capacitor is 1/n, ignoring the impedance of the connecting electrodes.
When used as an audio power filter capacitor 15, as shown in FIG.
This method takes advantage of the fact that high-frequency sound quality is improved by connecting low-loss capacitors 16 such as film capacitors, oil capacitors, and styrene capacitors in parallel.In the present invention, as shown in FIG. In parallel, there is a flat plate capacitor 1 composed of the above-mentioned lead-out electrode plate 1.2 and a sheet 3a impregnated with an electrolytic solution.
7 is connected, an electrolytic capacitor with good high frequency characteristics can be obtained.

Since the electrodes of the above-mentioned flat plate capacitor 17 are flat, an electrolytic capacitor with low loss and excellent impedance characteristics and an electrolyte impregnated between the electrode plates 1 and 2 can be obtained. An extremely stable electrolytic capacitor can be obtained without increasing leakage current even if electrolyte adheres to the capacitor.

Next, as an example, width 3oTrrI! L, an electrode foil with a length of 80 mm is wound through electrolytic paper, and the rated capacitance is 1000 μ.
An electrolytic capacitor element with an F1 rated voltage of 50 V was obtained, and this capacitor element was
m pieces on one side of aluminum electrode plates for anode and cathode,
1m on the opposite side, a total of 2 cables are connected in parallel, and the rated capacitance is 2.
An electrolytic capacitor of the present invention having a voltage of 0.000 μF and a rated voltage of 50 V was manufactured, and the frequency-impedance characteristics were measured. The results are shown in FIG.

Furthermore, as a result of measuring the leakage current, it was found to be 40 to 80 pA, which was 1:10 or less than the conventional value.

As is clear from FIG. 6, it was found that the impedance value at high frequencies of the present product was significantly reduced compared to the conventional product, and it was confirmed that the sound quality was also superior.

In addition, since the electrolytic capacitor of the present invention does not need to be wound non-inductively to form a flat element, the dimensions of both ends of the anode foil and cathode foil can be designed to be short, reducing the amount of material used. Therefore, it is easy to wind up, and processing such as flattening and tightening is not required, reducing working time and manufacturing costs by 30%.

The present invention consists of a flat capacitor formed by a pair of electrode plates sandwiching a sheet impregnated with an electrolytic solution, and electrode tabs connected in parallel to the electrode plates and pulled out in opposite directions. This electrolytic capacitor has multiple cylindrical capacitor elements sealed in a container, which reduces leakage current and significantly reduces impedance at high frequencies, making it ideal for use in switching regulators, audio amplifier power supply smoothing circuits, etc. It is suitable for large high-frequency circuits, is inexpensive, and can improve productivity, so it has great practical value.

[Brief explanation of the drawing]

Figure 1 shows a conventional electrolytic capacitor, where A is a perspective view of a flat element wound in a non-inductive manner, the opening is a perspective view of multiple flat elements of A stacked together and connected to an extraction electrode plate, and C is a perspective view of a non-inductively wound flat element. 2 and 3 show an embodiment of the electrolytic capacitor of the present invention, and FIG. 2A is an exploded perspective view of the electrolytic capacitor element. , Figure 2 (opening) is a perspective view of a wound cylindrical electrolytic capacitor element, Figure 2 (c) is a perspective view of a plurality of cylindrical elements assembled and connected to an extraction electrode plate, Figure 2 (2) is a perspective view of the opening cylinder. A plan view of a plurality of shaped elements assembled and connected to a lead-out electrode plate, Figure 3A is a perspective view of the lead-out electrode plate shown in Figure 2 with a terminal sealing plate attached, and Figure 3 shows the electrolysis of the present invention. A perspective view of a capacitor, Figure 4 is a circuit diagram of an audio power filter, Figure 5 is a circuit diagram of an audio power filter using the electrolytic capacitor of the present invention, and Figure 6 is a comparison of the product of the present invention and a conventional product. It is an impedance frequency characteristic diagram of an electrolytic capacitor showing. 1.2: electrode plate, 3a: sheet impregnated with electrolyte, 8,
9: electrode tab, 12: container, 14: capacitor element.

Claims (1)

[Scope of utility model registration request] A flat capacitor formed of a pair of electrode plates sandwiching a sheet impregnated with an electrolyte, and a plurality of cylindrical capacitor elements connected in parallel to the electrode plates and having electrode tabs pulled out in opposite directions. An electrolytic capacitor is made by sealing this in a container.