JP2012019006A - Separator and capacitor using the same - Google Patents

Abstract

An object of the present invention is to provide a capacitor that reduces the resistance of the capacitor and also has excellent short-circuit resistance.
A separator 1 according to the present invention has a linear through hole 10 and has an opening area on the front surface and the back surface of the through hole 10 having substantially the same area. With this configuration, the electrolyte easily passes through the through-hole 10, and the mobility of the electrolyte between the electrodes is improved. As a result, the resistance of the capacitor can be reduced. Further, according to the shape of the through hole 10 of the present invention, the substantial thickness of the separator 1 is not reduced, and the possibility of contact between the anode electrode and the cathode electrode can be reduced, and the separator of the present invention is used. The capacitor has excellent short-circuit resistance.
[Selection] Figure 2

Description

  The present invention relates to a capacitor separator used for automobiles, various electronic devices, electrical devices, industrial devices, and the like, and a capacitor using the separator.

  In recent years, the number of ECUs (electronic control units) has increased with the increase in the number of functions and the digitization of vehicles, and space saving has been demanded by integrating (miniaturizing) ECUs against the backdrop of securing installation locations (securing vehicle interior space). The capacitors mounted on the ECU are inevitably downsized. In order to reduce the size without degrading the performance as a capacitor, it is indispensable to further reduce the resistance, and various companies have proposed various techniques for reducing the resistance of the capacitor.

  One of the proposals for realizing such a low resistance capacitor is a method using a porous separator.

  For example, Patent Document 1 proposes a porous separator having a thickness of less than 100 μm and a porosity of 55% or less, and further including no stretching treatment as a thinning treatment.

  That is, in the technique described in Patent Document 1, the thickness, porosity, or processing method of the separator is specified, and the resistance of the capacitor is reduced by maintaining a favorable structure of the holes provided in the separator.

JP-A-2005-109244

  Certainly, it was possible to reduce the resistance of the capacitor by the technique described in Patent Document 1.

  However, the technique described in Patent Document 1 does not consider the shape and size of the holes provided in the separator, and the holes provided in the separator are difficult to pass through the electrolyte, for example, spirals or curves. In this case, the mobility of the electrolyte from the anode foil to the cathode foil (or from the cathode foil to the anode foil) deteriorates, and the resistance may increase. Further, when the areas of the opening portions on the back surface and the front surface are significantly different like a trumpet-shaped hole, the substantial thickness of the separator is greatly reduced, which may cause a short circuit.

  Accordingly, in the present invention, focusing on the shape of the holes of the separator, by providing a separator having a through hole having a shape suitable for the passage of electrolyte and short-circuit resistance, the resistance of the capacitor is reduced, and further, short-circuit resistance. It is another object of the present invention to provide an excellent capacitor.

  In order to achieve this object, the separator of the present invention has a straight through-hole, and has a configuration in which the area of the opening on the front surface and the back surface of the through-hole is approximately the same.

  First, resistance can be reduced by using the separator of this invention for a capacitor.

  This is because a linear through hole is provided in the separator, and the area of the opening on the front surface and the back surface of the through hole is set to be approximately equal.

  With this configuration, the electrolyte can easily pass through the through hole, and the mobility of the electrolyte between the electrodes can be improved. As a result, the resistance can be reduced.

  Further, according to the shape of the through hole of the present invention, it is possible to suppress a substantial decrease in the thickness of the separator due to the formation of the through hole, and therefore it is possible to improve short circuit resistance.

  In addition, when the through hole is formed by corona discharge treatment, the surface functional group of the separator is changed at the same time as the through hole having the above shape is formed in the separator, thereby improving the affinity between the separator and the electrolytic solution. It is possible to further reduce the resistance of the capacitor.

It is a figure which shows the structure of the electrolytic capacitor using the separator of Example 1, (a) is a development perspective view of a capacitor element, (b) is sectional drawing of an electrolytic capacitor. The schematic diagram which shows the shape of the separator of Example 1 It is an electron micrograph which shows the shape of the through-hole of the separator of Example 1, (a) is an electron micrograph of the through-hole of a cellulose separator, (b) is an electron micrograph of the through-hole of a polyolefin separator. Schematic which shows the manufacturing apparatus of the capacitor element using the separator of Example 1. FIG.

Example 1
Hereinafter, the separator in a present Example is demonstrated.

  In the present embodiment, an electrolytic capacitor will be described as an example. However, the present invention is not limited to this, and the present invention can also be suitably applied to capacitors such as electric double layer capacitors and electrochemical capacitors.

  First, an example of an electrolytic capacitor 2 using the separator 1 of this embodiment will be described with reference to FIG.

  Here, FIG. 1A is a developed perspective view of the capacitor element 3 using the separator 1 of this embodiment, and FIG. 1B is a cross-sectional view of the electrolytic capacitor 2 using the separator 1 of this embodiment. is there.

  As shown in FIG. 1 (a), the capacitor element 3 using the separator 1 of the present embodiment has an anode aluminum foil 4 and a cathode aluminum foil 5 with a dielectric layer made of aluminum oxide formed on the surface between them. The anode aluminum foil 4 and the cathode aluminum foil 5 are joined with lead wires 6 each composed of a rod-like joint portion and a solderable external lead portion.

  As shown in FIG. 1B, the electrolytic capacitor 2 of this embodiment is impregnated with a driving electrolyte (not shown) in the capacitor element 3 and further stored in a bottomed cylindrical aluminum case 7. After that, the opening of the aluminum case 7 is formed by sealing with a sealing member 8. The sealing member 8 is provided with two insertion holes 9, and the two lead wires 6 are drawn out to the outside by being inserted into the insertion holes 9. The lead wire 6 is electrically connected to an electrode outside the electrolytic capacitor 2.

  For example, the following cations, anions and solvents are used in the driving electrolyte.

  Examples of the cation include ammonium, phosphonium, sulfonium, oxonium, selenium, amidinium, and guanidinium.

  Examples of the anion include carboxylic acids such as phthalic acid, maleic acid, and benzoic acid, oxocarbon acids such as squaric acid, and fluorine-based anions such as tetrafluoroboric acid and hexafluorophosphoric acid.

  Examples of the solvent include γ-butyrolactone, propylene carbonate, ethylene carbonate, ethers, esters, sulfolanes such as sulfolane and ethyl methyl sulfone, and alcohols such as ethylene glycol.

  If necessary, various additives can be added to the driving electrolyte of the present invention. Examples of the additive include phosphoric acid derivatives (for example, phosphoric acid, phosphoric acid esters, etc.), boric acid derivatives (for example, boric acid, complex compounds of boric acid and polysaccharides [mannit, sorbit, etc.], boric acid and Complex compounds with polyhydric alcohols [ethylene glycol, glycerin, etc.], nitro compounds (for example, o-nitrobenzoic acid, p-nitrobenzoic acid, m-nitrobenzoic acid, o-nitrophenol, p-nitrophenol, p-nitroanisole, etc.) can be used, and the amount added is preferably within 10% by weight of the electrolyte from the viewpoint of the electrical conductivity of the electrolyte and the solubility in the electrolyte solvent.

  In addition, this invention can be employ | adopted as various capacitors, such as an electric double layer capacitor and an electrochemical capacitor. The structure of the electric double layer capacitor and the electrochemical capacitor using the separator 1 of this embodiment will be briefly described below.

  First, in an electric double layer capacitor, a capacitor element formed by winding an anode electrode and a cathode electrode with the separator 1 of this embodiment interposed therebetween or by laminating a plurality of layers, and the capacitor element together with an electrolytic solution A housing case and a sealing member that seals the opening of the case are provided, the current collectors of the anode electrode and the cathode electrode are both made of aluminum, and the polarizable electrode layers both contain activated carbon.

  On the other hand, in the case of an electrochemical capacitor, a capacitor element formed by winding an anode electrode and a cathode electrode with the separator 1 of this embodiment interposed therebetween or laminating a plurality of layers, and an electrolyte solution And a sealing member for sealing the opening of the case, the current collector of the anode electrode is formed of aluminum, the current collector of the cathode electrode is formed of copper or nickel, and the anode electrode The polarizable electrode layer contains activated carbon, the polarizable electrode layer of the cathode electrode contains graphite or soft carbon, and the electrolytic solution contains lithium ions.

  Next, the separator 1 which is the point of the present invention will be described in detail with reference to FIG. FIG. 2 is a schematic diagram showing the shape of the separator 1.

  As shown in FIG. 2, the separator 1 has a large number of through holes 10, and these through holes 10 have a linear shape. That is, as shown in FIG. 2, the through-hole 10 provided in the separator 1 of the present embodiment spans two opposing openings of the separator 1, that is, the opening on the front side and the opening on the back side of the separator 1. It penetrates at the shortest distance (ie in a straight line).

  Further, the through hole 10 has a configuration in which the area of the opening on the front surface and the back surface of the separator 1 is approximately the same. More specifically, the through hole 10 of the present embodiment is such that the area of the opening on the front surface of the separator 1 is within ± 20% of the area of the opening on the back surface, and Both openings on the back surface have a shape close to a perfect circle. That is, the opening on the front surface and the opening on the back surface are substantially similar in shape, and are formed in the same size.

  By making the shape of the through hole 10 as described above, the capacitor using the separator 1 of this embodiment has a reduced resistance. For example, if the through-hole of the separator has a shape like a spiral or a curve, the moving distance becomes unnecessarily long when the electrolyte moves from the front side to the back side of the separator, and the resistance becomes high. It is possible to end up. On the other hand, since the through-hole 10 of the present embodiment is linearly provided from the front surface side to the back surface side of the separator 1, the electrolyte can reach the back surface side from the front surface side of the separator 1 at the shortest distance. As a result, the movement of the electrolyte between the electrodes becomes smooth, and the resistance can be reduced.

  The results of verification regarding the movement of the electrolyte will be described below.

  First, the photograph of the through-hole 10 provided in the separator 1 in a present Example is shown to Fig.3 (a) and FIG.3 (b). Here, FIG. 3 (a) is a photograph showing a through-hole 10a provided in a cellulose separator 1a using cellulose as a material, and FIG. 3 (b) is a through-hole provided in a polyolefin separator 1b using a polyolefin resin as a material. It is a photograph which shows the hole 10b.

  In addition, the shape observation of these through-hole 10a and through-hole 10b was performed using the scanning electron microscope (HITACHI S-3400N). Moreover, formation of the through-hole 10a and the through-hole 10b was performed using the corona discharge process. A method of forming the through hole 10a and the through hole 10b by this corona discharge treatment will be described in detail later.

  The hole diameter of the through hole 10a provided in the cellulose separator 1a shown in FIG. 3A is about 4 μm, whereas the hole diameter of the through hole 10b of the polyolefin separator 1b is about 10 μm. Comparing the hole diameters of the through hole 10a and the through hole 10b, the through hole 10a has a smaller hole diameter. This is presumably because cellulose has a higher melting point than polyolefin resin, and is therefore difficult to dissolve when subjected to corona discharge treatment. Thus, when the hole diameter is small, the possibility that the anode aluminum foil 4 and the cathode aluminum foil 5 provided on both surfaces of the separator 1 are in contact with each other through the through hole 10 can be reduced. Therefore, it can be said that cellulose is more preferable as the material of the separator 1 from the viewpoint of short circuit resistance.

  Examples of cellulose used as a material for the cellulose separator 1a include coniferous wood pulp, hardwood wood pulp, esparto pulp, manila hemp pulp, saisai hemp pulp, cotton pulp, hemp and other natural celluloses, rayon fibers, and the like. Two or more kinds of mixed or copolymerized separator materials may be used.

  Similarly, examples of the polyolefin resin used as the material of the polyolefin separator 1b include polyethylene, polypropylene, polybutene, polypentene, polymethylpentene, and the like, and a separator material obtained by mixing or copolymerizing two or more of these may be used.

  The air permeability of the cellulose separator 1a and the polyolefin separator 1b was measured as an index indicating the mobility of the electrolyte with respect to the cellulose separator 1a and the polyolefin separator 1b. This is because the mobility of the electrolyte is generally proportional to the ease of passage of air, and thus the mobility of the electrolyte is evaluated by measuring the air permeability. The air permeability was measured using a Gurley air permeability meter.

  The measurement results of the air permeability of the cellulose separator 1a and the polyolefin separator 1b are shown in (Table 1). Moreover, the measurement result of the air permeability of the cellulose separator 1a and the polyolefin separator 1b which does not provide a linear through-hole as a comparative example is described simultaneously.

  As shown in this table, it can be seen that when the linear through holes 10a and 10b are formed in the cellulose separator 1a and the polyolefin separator 1b by corona discharge treatment, the air permeability is greatly improved. That is, the ease of passage of air is greatly improved by providing a linear through hole, which indicates that the mobility of the electrolyte is improved.

  Actually, when the resistance of the capacitor using the separator without the linear through-hole and the capacitor using the cellulose separator 1a and the polyolefin separator 1b were compared, the linear through-hole as shown in Table 1 was obtained. When the resistance of the capacitor using the separator not provided is 1, the result is 0.94 for the capacitor using the cellulose separator 1a and 0.2 for the capacitor using the polyolefin separator 1b.

  As is clear from these results, the separator 1 of this example can improve the mobility of the electrolyte between the electrodes, and as a result, the resistance of the capacitor can be reduced.

  In the above verification, the results are shown only for the cellulose separator 1a and the polyolefin separator 1b, but as the material for the separator 1, polyimide, polyamide, polyamideimide, polytetrafluoroethylene, polyvinylidene fluoride, etc. are used in addition to these. May be. Alternatively, the separator 1 may be formed by mixing or copolymerizing two or more of these. Even in the separator 1 made of the material as described above, by providing the linear through hole 10, the mobility of the electrolyte can be improved, and the resistance of the capacitor can be reduced.

  Further, in the through hole 10 of this embodiment, the area of the opening on the front surface of the separator 1 is within ± 20% of the area of the opening on the back surface. With this configuration, the substantial thickness of the separator 1 is not reduced. For example, when the through hole formed in the separator has a trumpet shape and the areas of the openings provided on the front surface and the back surface are significantly different, when the separator and the electrode are wound, the electrode It becomes easy to press-fit into the opening having the larger area, and as a result, the electrodes are likely to come into contact with each other. That is, it can be said that the substantial thickness of the separator is thin (the electrodes are easily in contact with each other). On the other hand, as shown in FIG. 2, the through-hole 10 provided in the separator 1 of the present embodiment has a linear shape in which the area of the opening on the front surface is within ± 20% of the area of the opening on the back surface. Therefore, the substantial thickness of the separator 1 is not reduced. As a result, the possibility that the electrodes are in contact with each other is reduced, and the separator 1 of this embodiment has excellent short-circuit resistance. In addition, formation of such a linear through-hole 10 selects suitably the material and thickness of the separator 1, and the formation method of the through-hole 10 (for example, the cellulose whose thickness is 15 micrometers or more and 40 micrometers or less as a material of the separator 1, and a formation method) This is possible by performing a corona treatment that defines the discharge amount and discharge degree.

  Table 2 shows the results of verification regarding the short-circuit resistance of the separator 1 of this example. (Table 2) shows a rating for a capacitor element 3 using a separator 1 in which the area of the opening on the front surface is within ± 20% (10%, 15%, 20%) with respect to the area of the opening on the back surface. This is a verification of the short-circuit rate when a test is conducted for 1000 hours in a constant temperature bath at 105 ° C. while applying a voltage. These verifications were performed on the cellulose separator 1a using the above-mentioned cellulose as a material and the polyolefin separator 1b using a polyolefin resin as a material. Further, as a comparative example, verification results of a capacitor element using a separator whose opening area on the front surface is about 25% and about 30% larger than the opening area on the back surface are shown simultaneously.

  As shown in (Table 2), there was no capacitor element 3 in which neither the separator 1 of the cellulose separator 1a nor the polyolefin separator 1b in which the area of the front surface opening was within ± 20% of the area of the back surface opening was short-circuited. On the other hand, the capacitor element using the separator whose opening area on the front surface is 25% of the area of the opening area on the back surface, when using cellulose as the material, when using polyolefin resin as the material, In this case, one element was short-circuited. Capacitor elements using a separator whose surface opening area is 30% of the area of the opening area on the back side, when cellulose is used as the material, three elements use polyolefin resin as the material In the case, four elements were short-circuited.

  As this result shows, the separator 1 of the present embodiment can prevent a short circuit between the electrodes, and can provide a highly reliable capacitor.

In order to further improve the short-circuit resistance, it is preferable that the through holes 10 of the separator 1 are uniformly distributed throughout the separator 1. Since the through holes 10 are uniformly distributed throughout the separator 1, current concentration can be prevented, so that the short-circuit resistance can be kept in a better state. In the separator 1 of the present embodiment, the through hole 10a of 5-9 per 1 cm ² in a cellulose separator 1a is a polyolefin separator 17-23 pieces per 1 cm ² in 1b through hole 10b is throughout the separators 1 It was uniformly dispersed. The ratio of the area of the through holes 10 to the area of the separator 1 was about 0.3% for the cellulose separator 1a and about 1.4% for the polyolefin separator 1b. As a result of the verification, the ratio of the area of the through hole 10 to the area of the separator 1 is 0.05% or more and 5% or less for both the cellulose separator 1a and the polyolefin separator 1b, and the through holes 10 are uniformly dispersed in the separator 1. In this way, it has been confirmed that low resistance and retention of short circuit resistance can be achieved.

  In order to provide excellent short-circuit resistance, it is desirable that the thickness of the separator 1 is at least as large as the diameter of the through hole 10. As actually shown in (Table 2), the cellulose separator 1a and the polyolefin separator 1b of this example have thicknesses of 25 μm and 28 μm, respectively, and the sizes of the through holes 10a and the through holes 10b are 4 μm and 10 μm, respectively. . Thus, short-circuit resistance can be maintained by setting the thickness of the separator 1 to be at least the diameter of the through hole 10.

  On the other hand, from the viewpoint of lowering the resistance, it is not preferable to make the separator 1 too thick because the mobility of the electrolyte is reduced. Therefore, the thickness of the separator 1 is desirably 10 μm or more and 100 μm or less. When the thickness of the separator 1 is smaller than 10 μm, the distance between the electrodes becomes too short, and the thickness of the separator 10 becomes thinner than the diameter of the through hole 10, so that the possibility of a short circuit is increased. On the other hand, when the thickness of the separator 1 is larger than 100 μm, the distance between the electrodes becomes long and the resistance of the capacitor element 3 becomes too large, which may cause a problem in actual use. Regarding the thickness of the separator 1, a thickness of 10 μm to 50 μm is more preferable, and a thickness of 15 μm to 40 μm is even more preferable. In the capacitor used in the present invention, in the case of a low voltage having a rated voltage of 50 V or less, it is preferably 15 μm or more and 40 μm or less.

  In order to realize low resistance, it is preferable that the diameter of the electrolyte is smaller than the diameter of the through-hole 10, but the diameter of the electrolyte generally used for various capacitors is shown in this embodiment. Since it is clearly smaller than the diameter of the through hole 10 formed by such a forming method, there is no influence at first. If the diameter of the through hole 10 is at least 1000 times larger than the diameter of the electrolyte, the influence of the diameter of the electrolyte on the resistance is insignificant.

  The fiber diameter of the separator 1 is preferably 0.01 μm or more and 3 μm or less, more preferably 0.01 μm or more and 1 μm or less, from the viewpoint of reducing resistance and maintaining short-circuit resistance.

  Next, a method for opening the straight through hole 10 and a method for manufacturing the electrolytic capacitor 2 using the separator 1 according to the present embodiment will be described. In addition, although the manufacturing method of the electrolytic capacitor 2 mentioned above is demonstrated below, this manufacturing method is applicable not only to the electrolytic capacitor 2 but an electric double layer capacitor and an electrochemical capacitor.

  Here, in order to make the shape of the through-hole 10 linear, electron beam treatment, insertion of a fine needle, corona discharge treatment, and the like can be mentioned. Of these, corona discharge treatment changes the surface functional group. This is a more suitable method because the affinity with the electrolyte can be optimized and the characteristics of the capacitor can be improved. Here, “changing the surface functional group” means that, for example, when the cellulose separator 1a is subjected to corona discharge treatment, the hydroxyl group in the cellulose becomes a carbonyl group and the reduction reaction proceeds. On the other hand, when the same treatment is applied to the polyolefin resin separator 1b, it means that oxygen is bonded and the oxidation reaction proceeds.

  Actually, in the separator 1 of the present embodiment, the linear through hole 10 is formed by performing corona discharge treatment.

  Specifically, a method for opening the through hole 10 using the corona discharge treatment and a method for manufacturing the electrolytic capacitor 2 using the separator 1 will be described below with reference to FIG. FIG. 4 is a schematic view showing an apparatus for manufacturing the capacitor element 3 using the separator 1.

  The two unwinding rolls 11 in which the separator 1 is wound in a reel shape are transported to the predetermined transport path 13 at a predetermined speed V (m / min) by the guide roller 12a, the guide roller 12b, and the guide roller 12c.

  The separator 1 conveyed from the unwinding roll 11 first reaches the corona discharge treatment unit 14, where the separator 1 is subjected to hole opening treatment, and the surface functional group changes.

  Here, the corona discharge treatment unit 14 is provided with two electrodes with a gap of about 2 mm, and these two electrodes are connected to a power source (not shown) so that an alternating high voltage can be applied. It has become. When a voltage of about 1 kV is applied by this power source, a weak current flows between the two electrodes due to the ionization effect, and corona discharge starts. In this embodiment, the corona discharge is applied to the separator 1 to perform the opening process.

In particular, in this embodiment, the both sides of the separator 1 are subjected to corona discharge treatment with a discharge amount of 20 W · min / m ^{2 to} 240 kW · min / m ² and a discharge degree of 200 W / cm ^{2 to} 120 kW / cm ² .

Note that the discharge amount and discharge degree are L (m) for the electrode width in the direction perpendicular to the transport path, S (cm ² ) for the discharge area of the discharge electrode, V (m / min) for the feeding speed of the separator 1, When the power is P (W), it is expressed by the following equation.

Discharge amount = P / (LV) (W · min / m ² )
Discharge rate = P / S (W / cm ² )
The corona discharge treatment unit 14 includes two electrodes. However, one electrode may be formed into a roll shape, and the corona discharge treatment may be performed while conveying the separator 1 by rotating the electrode.

  Moreover, although the corona discharge process is performed on both surfaces in the present embodiment, the through hole 10 can be provided in the separator 1 even when the corona discharge process is performed on only one surface, and the effects of the present embodiment are obtained. be able to.

  After the separator 1 is subjected to the corona discharge treatment, the separator 1 is further conveyed. Then, the separator 1 is interposed between the anode aluminum foil 4 and the cathode aluminum foil 5 by winding up the two separators 1, the anode aluminum foil 4, and the cathode aluminum foil 5 with the winding roll 15. The capacitor element 3 made is produced.

  The anode aluminum foil 4 and the cathode aluminum foil 5 are joined with a lead wire 6 composed of a rod-like joint portion and a solderable external lead portion.

  Thereafter, the manufactured capacitor element 3 is impregnated with a driving electrolyte, and the capacitor element 3 is stored in a bottomed cylindrical aluminum case 7, and then the opening of the aluminum case 7 is sealed with a sealing member 8. Thus, the electrolytic capacitor 2 is completed.

  If the separator 1 is subjected to a corona discharge treatment and then left for a long time, the surface functional groups of the separator 1 that have changed due to the corona discharge treatment deteriorate over time, and there is a problem that the state before the treatment returns. For this reason, it is preferable to perform the process of impregnating the driving electrolyte immediately after the corona discharge treatment. Therefore, the step of impregnating the driving electrolyte is performed immediately after the separator 1 is subjected to the corona discharge treatment, or the anode aluminum foil 4, the cathode aluminum foil 5, and the separator 1 are wound up by a winding roll, and the capacitor element 3 is wound up. It is desirable to carry out immediately after fabrication.

  The separator 1 of the present embodiment manufactured by the above manufacturing method has the straight through-hole 10 as described above, so that it has low resistance and at the same time has excellent short-circuit resistance.

Further, as described above, the corona discharge treatment is preferably performed at a discharge amount of 20 W · min / m ^{2 to} 240 kW · min / m ² and a discharge degree of ²⁰⁰ w / cm ^{2 to} 120 kW / cm ² .

This is because when the discharge amount is less than 20 W · min / m ² and the discharge degree is less than 200 W / cm ² , the effect of surface modification of the separator 1 by the corona discharge treatment is poor, and the discharge amount is 240 kW · If the discharge rate is greater than min / m ² and the discharge degree is greater than 120 kW / cm ² , the separator 1 may be heated during the corona discharge treatment, the strength may be reduced, or the separator 1 may be broken and penetrated in a desired shape. This is because the holes 10 may not be obtained.

  According to the present invention, it is possible to realize a reduction in resistance and an improvement in short-circuit resistance of a separator used in a capacitor. Therefore, the capacitor using the separator according to the present invention can be suitably used for various electronic devices such as automobiles, electrical devices, and industrial devices.

DESCRIPTION OF SYMBOLS 1 Separator 1a Cellulose separator 1b Polyolefin separator 2 Electrolytic capacitor 3 Capacitor element 4 Anode aluminum foil 5 Cathode aluminum foil 6 Lead wire 7 Aluminum case 8 Sealing member 9 Insertion hole 10 Through hole 10a Through hole 10b Through hole 11 Unwinding roll 12a Guide roller 12b Guide roller 12c Guide roller 13 Conveyance path 14 Corona discharge treatment part 15 Winding roll

Claims (7)

A separator having linear through holes and having substantially the same area of openings on the front and back surfaces of the through holes. The separator according to claim 1, wherein an area of the opening on the surface of the through hole is within ± 20% of an area of the opening on the back surface. The separator according to claim 1, wherein the through hole is formed by a corona discharge treatment. A capacitor element formed by winding an anode aluminum foil having a dielectric layer made of aluminum oxide on its surface and a cathode aluminum foil with a separator interposed therebetween, or by laminating a plurality of layers, and driving the capacitor element An electrolytic capacitor in which an electrolytic solution is impregnated and the capacitor element is housed in a bottomed cylindrical aluminum case, and then the opening of the aluminum case is sealed with a sealing material,
The capacitor in which the separator has a linear through hole, and the area of the opening on the front surface and the back surface of the through hole is approximately the same. Formed by winding a metal current collector and an anode electrode and a cathode electrode each having a polarizable electrode layer formed on the current collector with a separator interposed therebetween, or by laminating a plurality of layers A capacitor having a capacitor element, a case for storing the capacitor element together with an electrolyte, and a sealing member for sealing an opening of the case,
The capacitor in which the separator has a linear through hole, and the area of the opening on the front surface and the back surface of the through hole is approximately the same. The capacitor according to claim 5, wherein the current collectors of the anode electrode and the cathode electrode are both formed of aluminum, and both the polarizable electrode layers include activated carbon. The current collector of the anode electrode is formed of aluminum, the current collector of the cathode electrode is formed of copper or nickel, the polarizable electrode layer of the anode electrode contains activated carbon, and the component of the cathode electrode The capacitor according to claim 5, wherein the polar electrode layer contains graphite or soft carbon, and the electrolytic solution contains lithium ions.