JPH08213287A - Impregnating method with electrolyte to capacitor element in aluminum electrolytic capacitor - Google Patents

Abstract

PURPOSE: To provide an impregnating method with an electrolyte to a capacitor element in an alumunum electrolytic capacitor capable of sufficiently impregnating into the inside of the capacitor element with the electrolyte in a short time. CONSTITUTION: Capacitor elements 21 are dipped into an electrolyte 24 in an impregnating tank 22, the electrolyte 24 is further force-fed into the impregnating tank 22 under the dipped state, and pressure is applied to electrolyte 24 itself in the impregnating tank 22, thus applying the hydraulic pressure of the electrolyte 24 to the capacitor elements 21, then conducting pressure impregnation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for impregnating a capacitor element in an aluminum electrolytic capacitor used in various electronic devices with an electrolytic solution.

[0002]

2. Description of the Related Art Conventionally, when an electrolytic solution is impregnated into a capacitor element in this type of aluminum electrolytic capacitor, the equipment structure thereof is performed by the method shown in the order of processes in FIGS. 4 (a) and 4 (b). That is, FIG.
As shown in (a), first, a capacitor element 1 constituted by winding an anode foil and a cathode foil with a separator interposed therebetween is placed in an impregnation tank 2, and the impregnation is performed by a vacuum pump 3. 5300 Pa (about 40 mm) in the tank 2
Hg) Depressurize below. Next, as shown in FIG. 4 (b), the electrolytic solution 5 is injected into the impregnation tank 2 from the electrolytic solution tank 4, and then the inside of the impregnation tank 2 is opened to the atmospheric pressure by a vacuum impregnation method. 1 was impregnated with the electrolytic solution 5. In FIGS. 4 (a) and 4 (b), 6 is an opening / closing valve.

However, in this vacuum impregnation method, when it is attempted to sufficiently impregnate the inside of the capacitor element 1 with the electrolytic solution 5, the capacitor element 1 is immersed in the electrolytic solution 5 for a long time after being vacuum impregnated. Since it is necessary to leave it for a time, the productivity of the electrolytic capacitor is significantly reduced. Further, when the size of the capacitor element 1 is large, impregnation becomes insufficient, and the capacitance and tan δ (dielectric loss)
There is also a problem that the electric characteristics such as the above are adversely affected.

In the past, in order to improve these problems, the capacitor element is impregnated with the electrolytic solution by another method as shown in FIG. 5 (a) (b) (c) in order. It was That is, as shown in FIG. 5 (a), first, a capacitor element 7 constituted by winding an anode foil and a cathode foil with a separator interposed therebetween is placed in an impregnation tank 8, and then a vacuum pump is used. The inside of the impregnation tank 8 is decompressed by 9 to 5300 Pa (about 40 mmHg) or less.
Next, as shown in FIG. 5B, vacuum impregnation is performed in which the electrolytic solution 11 is injected from the electrolytic solution tank 10 into the impregnation tank 8 and then the impregnation tank 8 is opened to the atmospheric pressure. After this vacuum impregnation, as shown in FIG.
In the state where the capacitor element 7 is immersed in 1, the air is injected into the space 12 in the impregnation tank 8 by the compressor 13.
The electrolytic solution 11 is impregnated with the electrolytic solution 11 by pressurizing the electrolytic solution 11 with air of about 1.5 × 10 ^{5 to} 5 × 10 ⁵ Pa (about 1.5 to 5 kgf / cm ² ). The electrolytic solution 11 was impregnated into the capacitor element 7 by the pressure impregnation method. In addition, this FIG.
In (a), (b) and (c), 14 is an opening / closing valve.

[0005]

However, as shown in FIG.
Even in the combination of the vacuum impregnation method and the pressure impregnation method as shown in (a), (b) and (c), when the electrolytic solution 11 is sufficiently impregnated inside the capacitor element 7, the vacuum impregnation is performed. Although it is a short time as compared with the case where only the construction method is used, a leaving time is required in which the capacitor element 7 is left in the electrolytic solution 11 while being immersed therein. In this case as well, in FIG. 4 (a) (b) ), There is a problem that the productivity of the electrolytic capacitor is reduced as in the case where only the vacuum impregnation method shown in FIG. Further, when the size of the capacitor element 7 is large, the impregnation is still insufficient, although it is improved as compared with the case where only the vacuum impregnation method shown in FIGS. 4 (a) and 4 (b) is performed. However, this has a problem that it adversely affects the electric characteristics such as capacitance and tan δ.

When trying to solve these problems,
It is necessary to increase the pressure applied by the air from several tens of times to several hundreds of times of super-high pressure, and pressurization using this air,
Since the contraction rate of air is very large, the compressor 13
A large size itself is required, and an impregnation tank 8 that can withstand pressure on the wall of the impregnation tank 8 due to the contraction is required, which not only complicates the equipment but is also extremely disadvantageous in terms of cost. It was something that

The present invention solves the above-mentioned problems of the prior art, and is a capacitor element in an aluminum electrolytic capacitor in which the electrolytic solution can be sufficiently impregnated into the inside of the capacitor element in a short time without complicating the equipment. It is an object of the present invention to provide a method for impregnating an electrolyte solution with a solution.

[0008]

In order to achieve the above object, a method of impregnating an electrolytic solution into a capacitor element in an aluminum electrolytic capacitor of the present invention comprises winding an anode foil and a cathode foil with a separator interposed therebetween. By immersing the capacitor element constituted by the above in the electrolytic solution in the impregnation tank, by further pressing the electrolytic solution in the impregnation tank by applying pressure to the electrolytic solution itself in the impregnation tank in this immersion state, The electrolytic pressure of the electrolytic solution is applied to the capacitor element to impregnate the capacitor element under pressure.

[0009]

According to the above-mentioned impregnation method, the electrolytic solution is further pumped into the impregnation tank by immersing the capacitor element in the electrolytic solution inside the impregnation tank to apply pressure to the electrolytic solution itself in the impregnation tank. The liquid pressure of the liquid is applied to the capacitor element to impregnate the capacitor element under pressure, and the liquid pressure of this electrolytic solution is the same as the conventional air pressure [1.5 × 1].
0 ⁵ ~5 × 10 ⁵ Pa (about 1.5~5kgf / cm ^2)] compared to, for pressurizing than shrinkage incomparably small liquid gas, equipment as pressurization by a conventional pneumatic It does not become complicated and is very advantageous in terms of cost, and the liquid pressure of the electrolytic solution is several times to several hundreds times higher than the conventional pressure applied by air pressure [10 × 10 ^{5 to} 500 ×]. 10 ⁵ Pa
(About 10 to 500 kgf / cm ² )], it is possible to sufficiently impregnate the inside of the capacitor element with the electrolytic solution in a short time, which results in insufficient capacitance and tan δ due to insufficient impregnation. There is no adverse effect on the electrical characteristics.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1A and 1B show an embodiment of the present invention in process order. One example of this is shown in FIG.
As shown in (a), first, a capacitor element 21 constituted by winding an anode foil and a cathode foil with a separator interposed therebetween is placed in an impregnation tank 22, and then, as shown in FIG. As shown, the electrolytic solution 24 is injected from the electrolytic solution tank 23 into the impregnating tank 22 by a pressure pump 25 to fill the impregnating tank 22 so that the capacitor element 21 is immersed in the electrolytic solution 24. In this immersion state, the electrolytic pump 24 further pressurizes the electrolytic solution 24 in the electrolytic solution tank 23 into the impregnating tank 22 to the electrolytic solution 24 itself in the impregnating tank 22.
[10 × 10 ^{5 to} 500 × 10 ⁵ Pa (about 10 to 500 kg
f / cm ² )], the liquid pressure of the electrolytic solution 24 is applied to the capacitor element 21, that is, [10 ×
10 ^{5 to} 500 × 10 ⁵ Pa (about 10 to 500 kgf / c
m ² )], the air in the capacitor element 21 is released by the liquid pressure, and at the same time, the electrolytic solution 24 is impregnated into the capacitor element 21. It is something. In addition, this Figure 1
In (a) and (b), 26 is an opening / closing valve.

As described above, according to the embodiment of the present invention, the capacitor element 21 is dipped in the electrolytic solution 24 in the impregnation tank 22, and is further stored in the electrolytic solution tank 23 by the pressure pump 25 in the impregnation tank 22. The electrolytic solution 24 is pressure-fed and pressure is applied to the electrolytic solution 24 itself in the impregnation tank 22 to apply the liquid pressure of the electrolytic solution 24 to the capacitor element 21.
Since the liquid pressure of the electrolytic solution 24 pressurizes a liquid whose contraction rate is orders of magnitude smaller than that of gas as compared with the conventional pressurization by air pressure, It does not become complicated in terms of equipment like pressurization by air pressure, and is very advantageous in terms of cost. The liquid pressure of the electrolytic solution 24 is several times to several hundreds times higher than the pressure applied by conventional air pressure [10 × 10 ^{5 to} 500 × 10 ⁵ P
a (about 10 to 500 kgf / cm ² )], it is possible to sufficiently impregnate the inside of the capacitor element 21 with the electrolytic solution 24 in a short time. It is also possible to prevent adverse effects on the electrical characteristics such as tan δ.

2 (a), (b) and (c) show another embodiment of the present invention in the order of steps, and the same parts as those of the above-mentioned one embodiment of the present invention are designated by the same reference numerals. To do. In another embodiment, as shown in FIG. 2 (a), first, an impregnation tank 2 is provided with a capacitor element 21 formed by winding an anode foil and a cathode foil with a separator interposed therebetween.
2 and then the impregnation tank 22 is depressurized to 5300 Pa (about 40 mmHg) or less by the vacuum pump 27 to remove the air in the capacitor element 21. Then Fig. 2
As shown in (b), the electrolytic solution 24 is injected from the electrolytic solution tank 23 into the impregnation tank 22 by the pressure pump 25, and the electrolytic solution 24 is held in the capacitor element 21. After that, the inside of the impregnation tank 22 is once opened to the atmospheric pressure, and the impregnation tank 2
2 is filled with the electrolytic solution 24 in the electrolytic solution tank 23 by the pressure pump 25 into the void portion 28 located in the upper part of the inside of the electrolytic solution tank 24, and then the state shown in FIG.
As shown in (c), the electrolytic solution 24 in the electrolytic solution tank 23 is further pressure-fed into the impregnating tank 22 by the pressure pump 25 to supply the electrolytic solution 24 in the impregnating tank 22 to [10 × 10 ⁵ to 50 × 50.
0 × 10 ⁵ Pa (approx. 10 to 500 kgf / cm ² )], the liquid pressure of the electrolytic solution 24 is applied to the capacitor element 21, that is, [10 × 10 ^{5 to} 500 × 10 ^5].
Pa (about 10 to 500 kgf / cm ² )], the electrolytic solution 24 held by the capacitor element 21 is applied.
Is instantly impregnated into the inside of the capacitor element 21.

As described above, according to another embodiment of the present invention,
The electrolytic solution 24 in the electrolytic solution tank 23 is pressure-fed into the impregnating tank 22 by the pressure pump 25 to apply pressure to the electrolytic solution 24 itself in the impregnating tank 22 to apply the liquid pressure of the electrolytic solution 24 to the capacitor element 21. Before the pressure impregnation into 21, the pressure inside the impregnation tank 22 containing the capacitor element 21 is reduced to 5300 Pa (about 40 mmHg) or less by the vacuum pump 27 so that the air inside the capacitor element 21 is removed. When the above-mentioned liquid pressure of the electrolytic solution 24 is applied to the capacitor element 21 for pressure impregnation, the electrolytic solution 24 held in the capacitor element 21 is impregnated into the inside of the capacitor element 21 in a shorter time. It has an excellent effect of being able to.

FIG. 3 shows an impregnation method according to another embodiment of the present invention shown in FIGS. 2 (a) (b) (c) and FIGS. 5 (a) (b).
Using the impregnation method of the conventional example shown in (c), a rating of 160
9 shows changes in electrostatic capacity and tan δ of these capacitors with respect to a standing time in a subsequent standing step when a capacitor element having V27,000 μF and size φ90 × L150 is impregnated with the electrolytic solution.

As is apparent from FIG. 3, in the case of another embodiment of the present invention, since pressure impregnation is performed by the liquid pressure of the electrolytic solution, compared with the pressure impregnation by air pressure of the conventional example,
The time left after impregnation can be significantly reduced, the electrostatic capacity is slightly higher, and tan δ is also smaller.
This shows that the electrolytic solution is sufficiently impregnated into the inside of the capacitor element.

[0016]

As described above, the aluminum electrolytic capacitor of the present invention is used.
The method of impregnating the capacitor element with the electrolyte is
With the capacitor element immersed in the electrolytic solution in the impregnation tank
Further, the electrolytic solution is pumped into the impregnation tank so that
By applying pressure to the body, the liquid pressure of the electrolyte is
Perform pressure impregnation on the capacitor element over the element
The liquid pressure of this electrolyte is the same as the conventional air pressure.
Pressurization by [1.5 × 10 ^Five~ 5 × 10^FivePa (about 1.5 ~
5 kgf / cm²)] Compared to
Because it is small, it can be installed in equipment like conventional pressurization by air pressure.
It will not be complicated and will be very advantageous in terms of cost.
In addition, the liquid pressure of the electrolyte is increased by conventional air pressure.
Pressure several times to several hundred times pressure [10 × 10^Five~ 500x1
0^FivePa (about 10 to 500 kgf / cm²)]
Since it can be done, it is possible to get inside the capacitor element in a short time.
Can be impregnated with electrolyte, which allows
The negative effect on the electrical characteristics such as capacitance and tan δ due to the foot
There is nothing to say.

[Brief description of drawings]

FIG. 1 is a process diagram sequentially showing an embodiment of a method of impregnating a capacitor element with an electrolytic solution in an aluminum electrolytic capacitor of the present invention.

FIG. 2 is a process chart showing another embodiment of the electrolytic solution impregnation method of the present invention in order.

FIG. 3 is a characteristic diagram of changes in capacitance and tan δ with respect to standing time when an electrolytic solution is impregnated using the impregnation method of another example of the present invention and the impregnation method of the conventional example.

FIG. 4 is a process diagram sequentially showing an example of a method of impregnating a capacitor element in a conventional aluminum electrolytic capacitor with an electrolytic solution.

FIG. 5 is a process chart showing another example of a conventional electrolytic solution impregnation method in order.

[Explanation of symbols]

 21 capacitor element 22 impregnation tank 23 electrolytic solution tank 24 electrolytic solution 25 pressure feed pump 27 vacuum pump

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kunihito Inagaki 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Minor Tsunesaki 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (2)

[Claims] 1. A capacitor element formed by winding an anode foil and a cathode foil with a separator interposed therebetween and immersing the capacitor element in an electrolytic solution in an impregnation tank, and in this immersion state, further in the impregnation tank. To the capacitor element in the aluminum electrolytic capacitor, in which the electrolytic solution is pressure-impregnated by applying the liquid pressure of the electrolytic solution to the capacitor element by applying pressure to the electrolytic solution itself in the impregnation tank. Electrolyte impregnation method. 2. A capacitor is constructed by winding a positive electrode foil and a negative electrode foil with a separator interposed therebetween and winding the capacitor element in an impregnation tank, and then depressurizing the impregnation tank with a vacuum pump. The air in the element is evacuated, and then the electrolytic solution is injected into the impregnation tank to infiltrate the electrolytic solution into the capacitor element, and thereafter,
Further, in an aluminum electrolytic capacitor in which the electrolytic solution is pressure-fed into the impregnation tank to apply pressure to the electrolytic solution itself in the impregnation tank to apply the liquid pressure of the electrolytic solution to the capacitor element to perform pressure impregnation on the capacitor element. Method for impregnating capacitor element with electrolyte.