electrolytic capacitor

Abstract

Disclosed is an electrolytic capacitor 10 comprising: positive electrode bodies 21 and negative electrode bodies 31 that are laminated on each other; and separators 24, 34, 37 for insulating the positive electrode bodies 21 and the negative electrode bodies 31 from each other. The separators 24, 34, 37: have formed therein openings 25, 26, 35, 36, 38 through which the positive electrode bodies 21 and / or the negative electrode bodies 31 are inserted so as to penetrate the separators 24, 34, 37; and are impregnated with liquid components. Accordingly, the electrode bodies and the separators can be easily positioned.

Description

[Technical Field]

[0001] The present disclosure relates to electrolytic capacitors. [Background technology]

[0002] Conventionally, there has been known a laminated electrolytic capacitor having a capacitor element in which anode foils and cathode foils, which are electrode bodies, are alternately laminated with separators interposed therebetween (for example, Patent Document 1). In the electrolytic capacitor of Patent Document 1, through holes are formed in one of the anode foils or cathode foils and in the separator, and the other anode foil or cathode foil is joined via the through holes. This is said to prevent misalignment of the anode foils and cathode foils when stacked. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-87290 Summary of the Invention [Problem to be solved by the invention]

[0004] However, as described above, manufacturing the electrolytic capacitor of Patent Document 1 requires a step of joining anode foils or cathode foils to each other. Such a joining step is cumbersome and can reduce the productivity of electrolytic capacitors. In this situation, one of the objectives of the present disclosure is to facilitate the alignment of an electrode assembly and a separator. [Means for solving the problem]

[0005] One aspect of the present disclosure relates to an electrolytic capacitor including an anode body and a cathode body stacked on each other, and a separator that insulates the anode body from the cathode body, the separator having an opening through which at least one of the anode body and the cathode body is inserted so as to penetrate the separator, and the separator being impregnated with a liquid component. [Effects of the Invention]

[0006] According to the present disclosure, the electrode assembly and the separator can be easily aligned.

[0007] The novel features of the present invention are set forth in the appended claims, but the present invention, both in terms of structure and content, together with other objects and features of the present application, will be better understood from the following detailed description taken in conjunction with the drawings. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a top view schematically showing an anode unit and a cathode unit according to the first embodiment. [Figure 2] 1 is a top view schematically showing the electrolytic capacitor of Embodiment 1, with the top plate of the case omitted. [Figure 3] FIG. 3 is an end view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is an end view taken along line IV-IV in FIG. 2. [Figure 5] 10 is a partially enlarged view schematically illustrating a drawing section of a first modified example of the first embodiment. FIG. [Figure 6] 10 is a partially enlarged view schematically illustrating a drawing section of a second modified example of the first embodiment. FIG. [Figure 7] 10 is a partially enlarged view schematically illustrating a drawing section of a third modified example of the first embodiment. FIG. [Figure 8] FIG. 10 is a top view schematically showing an anode unit and a cathode unit of a second embodiment. [Figure 9] FIG. 10 is a top view schematically showing an anode unit and a cathode unit according to a modified example of the second embodiment. [Figure 10]FIG. 10 is a top view schematically showing an anode body, a cathode body, and a separator according to a third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Embodiments of the electrolytic capacitor according to the present disclosure are described below using examples. However, the present disclosure is not limited to the examples described below. In the following description, specific numerical values ​​and materials may be used as examples, but other numerical values ​​and materials may be used as long as the effects of the present disclosure are obtained. In addition, in the following description, terms indicating directions such as "up" and "down" are used for convenience and do not limit the present disclosure in any way.

[0010] The electrolytic capacitor according to the present disclosure includes an anode body and a cathode body stacked on top of each other, and a separator.

[0011] The anode body is one of the electrode bodies and may be formed in a foil or sheet shape. The anode body may be formed by roughening the surface of a metal foil made of, for example, a valve metal such as aluminum, tantalum, or niobium, or an alloy containing such a valve metal. The metal foil may be roughened using an etching treatment technique such as direct current electrolysis or alternating current electrolysis. Roughening the metal foil can form multiple projections and recesses on its surface.

[0012] A dielectric layer may be formed on the surface of the anode body. Roughening the surface of the anode body can increase the surface area of ​​the dielectric layer. The dielectric layer may be formed, for example, by immersing a metal foil in a chemical conversion solution such as an ammonium adipate solution and subjecting the metal foil to a chemical conversion treatment (while applying a voltage as necessary). Anode bodies can generally be mass-produced by roughening the surface of a large metal foil containing a valve metal or the like, subjecting it to a chemical conversion treatment, and then cutting it to the desired size.

[0013] The cathode body is the other electrode body and may be formed in a foil or sheet shape. Like the anode body, the cathode body may be formed by roughening the surface of a metal foil made of a valve metal such as aluminum, tantalum, or niobium, or an alloy containing such a valve metal. Like the anode body, the cathode body may be roughened and / or subjected to a chemical conversion treatment, if necessary. Furthermore, a carbon layer, a metal layer such as titanium or nickel, or a metal oxide layer such as aluminum oxide or titanium oxide may be formed on the surface of the cathode body.

[0014] The separator electrically insulates the anode body from the cathode body. The separator is interposed between the anode body and the cathode body. The separator may be formed using, for example, a nonwoven fabric containing fibers of cellulose, polyethylene terephthalate, vinylon, or polyamide (e.g., aliphatic polyamide, aromatic polyamide such as aramid).

[0015] The separator is impregnated with a liquid component, which may be an electrolyte solution, or may further be impregnated with a solid electrolyte.

[0016] The electrolyte may be a mixture of a non-aqueous solvent and an ionic substance (solute, such as an organic salt) dissolved therein. The non-aqueous solvent may be an organic solvent or an ionic liquid. Examples of non-aqueous solvents that can be used include ethylene glycol, propylene glycol, sulfolane, γ-butyrolactone, and N-methylacetamide. Examples of organic salts include trimethylamine maleate, triethylamine borodisalicylate, ethyldimethylamine phthalate, mono-1,2,3,4-tetramethylimidazolinium phthalate, and mono-1,3-dimethyl-2-ethylimidazolinium phthalate.

[0017] The solid electrolyte includes, for example, a manganese compound or a conductive polymer. Examples of the conductive polymer that can be used include polypyrrole, polythiophene, polyaniline, and derivatives thereof. A solid electrolyte containing a conductive polymer can be formed, for example, by chemically polymerizing and / or electrolytically polymerizing raw material monomers on a dielectric layer. Alternatively, the solid electrolyte can be formed, for example, by applying a solution in which the conductive polymer is dissolved or a dispersion in which the conductive polymer is dispersed to the dielectric layer.

[0018] An opening into which at least one of the anode body and the cathode body is inserted so as to penetrate the separator is formed in the separator. The opening may be a slit, and may be formed, for example, by cutting a part of the separator. At least one of the anode body and the cathode body is aligned with the separator by being inserted into the opening in the separator. Note that the portion of the anode body and / or the cathode body that is inserted into the opening can be set as desired depending on the shape of the anode body and / or the cathode body, the position of the opening, etc.

[0019] As described above, according to the present disclosure, the electrode assembly and the separator can be easily aligned by inserting the electrode assembly into the opening of the separator, without requiring a complicated process such as the joining process of Patent Document 1.

[0020] The separator may include a first separator and a second separator, and the first separator may have a first opening formed therein for inserting the anode body, and the second separator may have a second opening formed therein for inserting the cathode body. The anode body can be aligned with the first separator by being inserted into the first opening. The cathode body can be aligned with the second separator by being inserted into the second opening.

[0021] Here, the first separator and the anode body may form an anode unit, and the second separator and the cathode body may form a cathode unit. Furthermore, the anode unit and the cathode unit may be stacked on top of each other.

[0022] The first separator may have a third opening for inserting the cathode body, and the second separator may have a fourth opening for inserting the anode body. The cathode body can be aligned with the first separator by being inserted into the third opening. When there are multiple cathode bodies, any of the cathode bodies may be inserted into the third opening. The anode body can be aligned with the second separator by being inserted into the fourth opening. When there are multiple anode bodies, any of the anode bodies may be inserted into the fourth opening. In this way, when the above-mentioned anode unit and cathode unit are formed, the two units can be aligned with each other.

[0023] The anode body may have an anode body lead-out portion to which an anode lead is electrically connected, and the cathode body may have a cathode body lead-out portion to which a cathode lead is electrically connected, and the anode body lead-out portion and the cathode body lead-out portion do not have to overlap each other in a top view. This configuration can prevent the anode body and the cathode body from coming into electrical contact with each other, i.e., prevent the occurrence of a short circuit.

[0024] The anode lead and the cathode lead may be formed of, for example, a CP wire or a Cu wire containing a transition metal such as iron, copper, nickel, or tin. The anode lead and the cathode lead may be connected to the anode body and the cathode body via, for example, a tab made of a valve metal.

[0025] The anode body lead-out portion may be inserted into the first opening, and the cathode body lead-out portion may be inserted into the second opening. By inserting the anode body lead-out portion into the first opening, the anode body can be aligned with the first separator. By inserting the cathode body lead-out portion into the second opening, the cathode body can be aligned with the second separator.

[0026] The anode body lead-out portion may be inserted into the first opening up to a portion halfway in the drawing direction, and the cathode body lead-out portion may be inserted into the second opening up to a portion halfway in the drawing direction. Here, if the anode body lead-out portion or the cathode body lead-out portion is inserted into each opening up to its base in the drawing direction, the anode body and the cathode body may come into contact with each other near the base. In contrast, by configuring each lead-out portion to be inserted into its opening up to a portion halfway in the drawing direction, it is possible to prevent contact between the anode body and the cathode body near the base of each lead-out portion.

[0027] The first separator and the second separator may be bonded to each other, which can prevent the first separator and the second separator from being misaligned. The first separator and the second separator may be bonded to each other using, for example, ultrasonic waves.

[0028] The separator may be a bag-shaped separator having a first portion and a second portion facing one side and the other side of the anode body, respectively, and the cathode body may be inserted into an opening so as to penetrate at least one of the first portion and the second portion. The anode body may be housed in the bag-shaped separator. Meanwhile, the cathode body may be aligned with the bag-shaped separator by being inserted into an opening formed in the bag-shaped separator.

[0029] The separator may be a bag-shaped separator having a first portion and a second portion facing one side and the other side of the cathode body, respectively, and the anode body may be inserted into an opening so as to penetrate at least one of the first portion and the second portion. The cathode body may be housed in the bag-shaped separator. Meanwhile, the anode body may be aligned with the bag-shaped separator by being inserted into an opening formed in the bag-shaped separator.

[0030] The above-mentioned pouch-shaped separator can be formed by various methods. For example, a pouch-shaped separator may be formed by using two separators slightly larger than the anode body or cathode body and joining the edges of the two separators together. Alternatively, a pouch-shaped separator may be formed by using one separator that is at least twice the size of the anode body or cathode body, folding the separator in half, and joining the edges of the separator.

[0031] A plurality of anode bodies, cathode bodies, and separators may be provided, and the electrolytic capacitor may further include a binding member that binds the stacked anode bodies, cathode bodies, and separators together. For example, the binding member may be made of adhesive tape. The binding member may be formed, for example, in a strip shape, but is not limited to this.

[0032] The number of cathode bodies may be greater than the number of anode bodies. This configuration allows the capacitance of the electrolytic capacitor to be increased compared to when the number of anode bodies is greater. A plurality of cathode bodies and a plurality of anode bodies may be provided.

[0033] An example of an electrolytic capacitor according to the present disclosure will be described in detail below with reference to the drawings. The components described above can be applied to the components of the example electrolytic capacitor described below. The components of the example electrolytic capacitor described below can be modified based on the above description. Furthermore, the matters described below may be applied to the above-described embodiment. Of the components of the example electrolytic capacitor described below, components that are not essential to the electrolytic capacitor according to the present disclosure may be omitted. Note that the diagrams shown below are schematic and do not accurately reflect the shapes and numbers of actual components.

[0034] First Embodiment A description will be given of embodiment 1. The electrolytic capacitor 10 of this embodiment is a so-called hybrid electrolytic capacitor that uses an electrolytic solution and a solid electrolyte. However, the type of electrolytic capacitor is not limited to this.

[0035] As shown in FIGS. 1 to 4, electrolytic capacitor 10 includes capacitor element 11, anode lead 51, cathode lead 61, case 70, and sealing body 80.

[0036] Capacitor element 11 has an anode unit 20, a cathode unit 30, and a binding member 40. Capacitor element 11 is configured by stacking anode unit 20 and cathode unit 30 on top of each other and binding them with binding member 40.

[0037] There are provided a plurality (two in this example) of anode units 20. Each anode unit 20 has an anode body 21 and a first separator 24.

[0038] Anode body 21 is made of a valve metal or an alloy containing a valve metal. Anode body 21 is formed in a foil or sheet shape. The surface of anode body 21 is roughened. A dielectric layer is formed on the surface of anode body 21 by chemical conversion treatment. Anode body 21 has a rectangular sheet-shaped anode body main body 22 and a slightly elongated rectangular sheet-shaped anode body lead-out portion 23 formed integrally with and continuous to anode body main body 22. Anode body lead-out portion 23 is disposed on one side of anode body 21 (the left side in FIG. 1 in this example) in a direction (the left-right direction in FIG. 1) perpendicular to the lead-out direction (the up-down direction in FIG. 1).

[0039] First separator 24 is made of nonwoven fabric. First separator 24 is impregnated with an electrolytic solution and a solid electrolyte. First separator 24 is formed in the shape of a rectangular sheet slightly larger than anode body 21. First separator 24 has a first opening 25, into which anode body lead-out portion 23 is inserted, formed so as to penetrate first separator 24. First opening 25 is provided in first separator 24 at a position corresponding to anode body lead-out portion 23 (in this example, a position toward the left in FIG. 1 ). Anode body lead-out portion 23 is inserted into first opening 25 up to a portion partway in the lead-out direction.

[0040] Anode body lead-out portions 23 (two in this example) drawn out from first openings 25 of each first separator 24 are fixed so as to be electrically conductive to each other (see FIG. 3). Anode body lead-out portion 23 does not overlap with cathode body lead-out portion 33 in top view (see FIG. 2).

[0041] A third opening 26, into which a cathode body lead-out portion 33 (described later) is inserted, is formed in first separator 24 so as to penetrate first separator 24. Third opening 26 is provided in first separator 24 at a position corresponding to cathode body lead-out portion 33 (in this example, a position towards the right in FIG. 1 ). Cathode body lead-out portion 33 is inserted into third opening 26 up to a partway in the drawing direction. Cathode body lead-out portion 33 inserted into third opening 26 may be cathode body lead-out portion 33 of cathode unit 30 located above anode unit 20 to which first separator 24 belongs.

[0042] First separator 24 electrically insulates anode body 21 of anode unit 20 to which it belongs from cathode body 31 (described below) of cathode unit 30 located below.

[0043] A plurality of (three in this example) cathode units 30 are provided. Therefore, the number of cathode units 30 is greater than the number of anode units 20. Each cathode unit 30 has a cathode body 31 and a second separator .

[0044] Cathode body 31 is made of a valve metal or an alloy containing a valve metal. Cathode body 31 is formed in a foil or sheet shape. The surface of cathode body 31 may be roughened. A dielectric layer may be formed on the surface of cathode body 31 by chemical conversion treatment. Cathode body 31 has cathode body main body 32 formed in a rectangular sheet shape and cathode body lead-out portion 33 formed integrally and continuously with the cathode body main body 32 and in a slightly elongated rectangular sheet shape. Cathode body lead-out portion 33 is disposed on one side of cathode body 31 (the right side in FIG. 1 in this example) in a direction (the left-right direction in FIG. 1) perpendicular to the lead-out direction (the up-down direction in FIG. 1).

[0045] The second separator 34 is made of nonwoven fabric. The second separator 34 is impregnated with an electrolytic solution and a solid electrolyte. The second separator 34 is formed in the shape of a rectangular sheet slightly larger than the cathode body 31. A second opening 35, into which the cathode body pull-out portion 33 is inserted, is formed in the second separator 34 so as to penetrate the second separator 34. The second opening 35 is provided in the second separator 34 at a position corresponding to the cathode body pull-out portion 33 (in this example, a position toward the right in FIG. 1 ). The cathode body pull-out portion 33 is inserted into the second opening 35 up to a portion partway in the pull-out direction.

[0046] The multiple (three in this example) cathode body lead-out portions 33 drawn out from second openings 35 of the respective second separators 34 are fixed so as to be electrically conductive to each other (see FIG. 4). Cathode body lead-out portion 33 does not overlap with anode body lead-out portion 23 in top view (see FIG. 2).

[0047] A fourth opening 36, into which the anode body lead-out portion 23 is inserted, is formed in the second separator 34 so as to penetrate the second separator 34. The fourth opening 36 is provided in the second separator 34 at a position corresponding to the anode body lead-out portion 23 (in this example, a position towards the left in FIG. 1 ). The anode body lead-out portion 23 is inserted into the fourth opening 36 up to a partway in the drawing direction. The anode body lead-out portion 23 inserted into the fourth opening 36 may be the anode body lead-out portion 23 of an anode unit 20 located above the cathode unit 30 to which the second separator 34 belongs.

[0048] Second separator 34 electrically insulates cathode body 31 of cathode unit 30 to which it belongs from anode body 21 of anode unit 20 located below it.

[0049] The first separator 24 and the second separator 34 are bonded to each other by, for example, ultrasonic bonding. For example, the first separator 24 and the second separator 34 are bonded to each other at least a part of their respective peripheral edges.

[0050] The binding member 40 is an insulating member formed in a strip shape. In this embodiment, the binding member 40 has a width approximately the same as that of the first separator 24 and the second separator 34, but is not limited to this. The binding member 40 is wrapped around the anode unit 20 and the cathode unit 30 that are stacked on top of each other. The wrapped binding member 40 may be secured with insulating tape (not shown).

[0051] The anode lead 51 is a thin, rod-shaped metal member. The anode lead 51 is connected to the anode body 21 (specifically, the anode body lead-out portion 23) via an anode tab 52. The anode tab 52 is made of a valve metal such as aluminum. The anode lead 51 is exposed to the outside and constitutes one of the external terminals of the electrolytic capacitor 10.

[0052] The cathode lead 61 is a thin, rod-shaped metal member. The cathode lead 61 is connected to the cathode body 31 (specifically, the cathode body lead-out portion 33) via a cathode tab 62. The cathode tab 62 is made of a valve metal such as aluminum. The cathode lead 61 is exposed to the outside and constitutes the other external terminal of the electrolytic capacitor 10.

[0053] The case 70 is formed in the shape of a slightly flattened rectangular cylinder with a bottom and an opening at one end. The case 70 houses the capacitor element 11. In this embodiment, the case 70 is made of aluminum, but is not limited to this. For example, the case 70 may be made of a metal such as stainless steel, copper, iron, or brass, or an alloy of these. Alternatively, the case 70 may be made of a bag-shaped laminate film.

[0054] The sealing body 80 has a shape corresponding to the shape of the opening of the case 70 and seals the opening. The sealing body 80 is preferably formed using a rubber material with high elasticity and sealing properties. Examples of rubber materials with high heat resistance include silicone rubber, fluororubber, ethylene propylene rubber, chlorosulfonated polyethylene rubber (such as Hypalon rubber), butyl rubber, and isoprene rubber. The sealing body 80 has insertion holes formed therein for inserting the anode tab 52 and the cathode tab 62. The sealing body 80 can be formed using any insulating material. For example, the sealing body 80 may be formed using a laminate film, insulating tape, adhesive, or the like.

[0055] First Modification of First Embodiment Modification 1 of Embodiment 1 will be described. This modification differs from Embodiment 1 above in the shapes of anode body lead-out portion 23 and cathode body lead-out portion 33. The following mainly describes the differences from Embodiment 1 above.

[0056] As shown in Fig. 5, anode body lead-out portion 23 of this modified example has large-width portion 23a located on the base end side, small-width portion 23b located on the tip end side, and tapered portion 23c connecting these. In Fig. 5, the shape of first opening 25 is shown by a dashed line. Although not shown, cathode body lead-out portion 33 of this modified example has a similar configuration.

[0057] The width of the large width portion 23a (the length in the left-right direction in FIG. 5) is larger than the width of the first opening 25. The width of the small width portion 23b is smaller than the width of the first opening 25. The width of the tapered portion 23c coincides with the width of the first opening 25 midway in the drawing direction (the vertical direction in FIG. 5).

[0058] With this configuration, anode body pull-out portion 23 can be easily inserted into first opening 25. In addition, resistance to insertion increases when the insertion reaches the middle of tapered portion 23c, making it even easier to align anode body 21 with first separator 24.

[0059] Second Modification of First Embodiment Modification 2 of Embodiment 1 will be described. This modification differs from Embodiment 1 above in the shapes of anode body lead-out portion 23 and cathode body lead-out portion 33. The following mainly describes the differences from Embodiment 1 above.

[0060] As shown in Fig. 6, anode body pull-out portion 23 of this modified example has large-width portion 23a located on the base end side and small-width portion 23b located on the tip end side. In Fig. 6, the shape of first opening 25 is shown by a dashed line. Although not shown, cathode body pull-out portion 33 of this modified example has a similar configuration.

[0061] The width of the large width portion 23a (the length in the left-right direction in FIG. 6) is greater than the width of the first opening 25. The width of the small width portion 23b is equal to or less than the width of the first opening 25. The large width portion 23a and the small width portion 23b are continuous in a stepped manner.

[0062] With this configuration, when anode body pull-out portion 23 is inserted into first opening 25, resistance to insertion increases when it is inserted up to the tip of wide portion 23a, making it even easier to align anode body 21 with first separator 24.

[0063] Third Modification of First Embodiment Modification 3 of Embodiment 1 will be described. This modification differs from Embodiment 1 above in the shapes of anode body lead-out portion 23 and cathode body lead-out portion 33. The following mainly describes the differences from Embodiment 1 above.

[0064] As shown in Fig. 7, anode body pull-out portion 23 of this modified example has two large-width portions 23a located on the base end side and the tip end side, and small-width portion 23b located therebetween. In Fig. 7, the shape of first opening 25 is shown by a dashed line. Although not shown, cathode body pull-out portion 33 of this modified example has a similar configuration.

[0065] The width of the large width portions 23a (the length in the left-right direction in FIG. 7) is greater than the width of the first opening 25. The width of the small width portions 23b is equal to or less than the width of the first opening 25. The large width portions 23a and the small width portions 23b are continuous with each other so that the width gradually changes. Alternatively, the large width portions 23a and the small width portions 23b may be continuous with each other in a stepped manner.

[0066] With this configuration, when anode body pull-out portion 23 is inserted into first opening 25, the resistance to insertion decreases when the insertion reaches the region of narrow width portion 23b, making it possible to more easily align anode body 21 with first separator 24. Note that first separator 24 preferably has sufficient flexibility to allow large width portion 23a on the tip side to be inserted into first opening 25.

[0067] Second Embodiment A description will be given of embodiment 2. This embodiment differs from embodiment 1 in the configuration of capacitor element 11. The following mainly describes the differences from embodiment 1.

[0068] As shown in Fig. 8, capacitor element 11 of this embodiment is configured by stacking first unit 11a and second unit 11b. Although Fig. 8 shows one first unit 11a and one second unit 11b, the number of each unit is not limited to this.

[0069] The first unit 11a has, in order from the bottom, a cathode unit 30 and an anode unit 20. A second opening 35, into which a corner of the cathode body main body 32 of the cathode body 31 and a cathode body lead-out portion 33 are inserted, is formed in the second separator 34 of the cathode unit 30 so as to penetrate the second separator 34. A first opening 25, into which a corner of the anode body main body 22 of the anode body 21 is inserted, is formed in the first separator 24 of the anode unit 20 so as to penetrate the first separator 24.

[0070] In first unit 11a, first opening 25 and second opening 35 are located on the upper right side in Fig. 8. In first unit 11a, second opening 35 is located closer to the center of each unit than first opening 25. For this reason, the depth to which a corner of cathode body main body 32 is inserted into second opening 35 is deeper than the depth to which a corner of anode body main body 22 is inserted into first opening 25. Therefore, even when cathode unit 30 and anode unit 20 are stacked in first unit 11a, contact between cathode body 31 and anode body 21 between the two units is prevented.

[0071] Second unit 11b has, in order from the bottom, an anode unit 20 and a cathode unit 30. A first opening 25, into which a corner of anode body main body portion 22 of anode body 21 is inserted, is formed in first separator 24 of anode unit 20 so as to pass through first separator 24. A second opening 35, into which a corner of cathode body main body portion 32 of cathode body 31 and cathode body lead-out portion 33 are inserted, is formed in second separator 34 of cathode unit 30 so as to pass through second separator 34.

[0072] In second unit 11b, first opening 25 and second opening 35 are located on the upper right side in Fig. 8. In second unit 11b, first opening 25 is located closer to the center of each unit than second opening 35. For this reason, the depth to which a corner of anode body main body portion 22 is inserted into first opening 25 is deeper than the depth to which a corner of cathode body main body portion 32 is inserted into second opening 35. Therefore, even when anode unit 20 and cathode unit 30 are stacked in second unit 11b, contact between anode body 21 and cathode body 31 between the two units is prevented.

[0073] <<Modification of the Second Embodiment>> A modified example of the second embodiment will be described. This modified example differs from the second embodiment in the configuration of the second unit 11b. The following mainly describes the differences from the second embodiment.

[0074] 9 , second unit 11b has, in order from the bottom, an anode unit 20 and a cathode unit 30. A first opening 25, into which a corner of anode body main body portion 22 of anode body 21 and anode body lead-out portion 23 are inserted, is formed in first separator 24 of anode unit 20 so as to penetrate first separator 24. A second opening 35, into which a corner of cathode body main body portion 32 of cathode body 31 is inserted, is formed in second separator 34 of cathode unit 30 so as to penetrate second separator 34.

[0075] In second unit 11b, first opening 25 and second opening 35 are located on the upper left side in Fig. 9. In second unit 11b, first opening 25 is located closer to the center of each unit than second opening 35. Therefore, the depth to which a corner of anode body main body portion 22 is inserted into first opening 25 is deeper than the depth to which a corner of cathode body main body portion 32 is inserted into second opening 35. Therefore, even when anode unit 20 and cathode unit 30 are stacked in second unit 11b, contact between anode body 21 and cathode body 31 between the two units is prevented.

[0076] Third Embodiment A description will be given of embodiment 3. This embodiment differs from embodiment 1 in the configuration of capacitor element 11. The following mainly describes the differences from embodiment 1.

[0077] As shown in Fig. 10, capacitor element 11 of the present embodiment is configured by stacking cathode units 30 and anode bodies 21. Anode body 21 may be the same as that in embodiment 1. Note that, although Fig. 10 shows two cathode units 30 and two anode bodies 21, the numbers of both are not limited to this.

[0078] Each cathode unit 30 has a cathode body 31 and a pouch-shaped separator 37. The cathode body 31 may be the same as that in the first embodiment.

[0079] The bag-shaped separator 37 has a first portion 37a that faces one surface of the cathode body 31 (in this example, the surface on the near side of the paper in FIG. 10 ) and a second portion 37b that faces the other surface of the cathode body 31. The first portion 37a and the second portion 37b are each made of nonwoven fabric. The bag-shaped separator 37 is configured by joining the nonwoven fabric that forms the first portion 37a and the nonwoven fabric that forms the second portion 37b in a bag shape in a predetermined region (in this example, the region indicated by hatching in FIG. 10 ). The bag-shaped separator 37 accommodates the cathode body 31 in a state where part of the cathode body pull-out portion 33 is exposed.

[0080] Bag-shaped separator 37 is impregnated with an electrolytic solution and a solid electrolyte. Bag-shaped separator 37 is formed in a rectangular bag shape slightly larger than cathode body 31. Bag-shaped separator 37 has an opening 38, into which anode body lead-out portion 23 of anode body 21 is inserted, formed so as to penetrate first portion 37a and second portion 37b. Opening 38 is provided in bag-shaped separator 37 at a position corresponding to anode body lead-out portion 23 (in this example, a position toward the left in FIG. 10 ). Anode body lead-out portion 23 is inserted into opening 38 up to a portion partway in the drawing direction. Note that opening 38 formed in bag-shaped separator 37 may penetrate only first portion 37a.

[0081] Although not shown, the capacitor element may be configured by stacking an anode unit having an anode body and a bag-shaped separator, and a cathode body. In this case, the anode body is housed in the bag-shaped separator. Furthermore, the bag-shaped separator has an opening into which the cathode body lead-out portion is inserted.

[0082] While the present invention has been described in terms of presently preferred embodiments, such disclosure is not to be interpreted as limiting. Various changes and modifications will no doubt become apparent to those skilled in the art to which the present invention pertains upon reading the above disclosure. It is therefore intended that the appended claims be interpreted to cover all changes and modifications that do not depart from the true spirit and scope of the invention. [Industrial Applicability]

[0083] The present disclosure can be used for electrolytic capacitors. [Explanation of symbols]

[0084] 10: Electrolytic capacitor 11: Capacitor element 11a: 1st unit 11b: 2nd unit 20: Anode unit 21: Anode body 22: Anode body main body 23: Anode body drawer 23a: Significant part 23b: Narrow width part 23c: Tapered section 24: First separator (separator) 25: First opening (opening) 26: 3rd opening (opening) 30: Cathode unit 31: Cathode body 32: Cathode body main body 33: Cathode body extraction section 34: Second separator (separator) 35: Second opening (opening) 36: 4th opening (opening) 37: Bag-shaped separator (separator) 37a: 1st part 37b:Second part 38:Aperture 40: Binding material 51: Anode lead 52: Anode tab 61: Cathode lead 62: Cathode tab 70: Case 80: Sealing body

Claims

1. an anode body and a cathode body stacked on top of each other; a separator that insulates the anode body from the cathode body; Equipped with an opening into which at least one of the anode body and the cathode body is inserted so as to penetrate the separator is formed in the separator, and the separator is impregnated with a liquid component; the separator includes a first separator and a second separator, a first opening into which the anode body is inserted is formed in the first separator, a second opening into which the cathode body is inserted is formed in the second separator, a third opening into which the cathode body or another cathode body is inserted is formed in the first separator; an electrolytic capacitor, wherein the second separator has a fourth opening formed therein, into which the anode body or another anode body is inserted;

2. the anode body has an anode body lead-out portion to which an anode lead is electrically connected, the cathode body has a cathode body lead-out portion to which a cathode lead is electrically connected, 2. The electrolytic capacitor according to claim 1, wherein the anode body lead-out portion and the cathode body lead-out portion do not overlap each other in a top view.

3. the anode body lead-out portion is inserted into the first opening, 3. The electrolytic capacitor according to claim 2, wherein the cathode lead-out portion is inserted into the second opening.

4. the anode body pull-out portion is inserted into the first opening up to a midpoint in a pull-out direction, 4. The electrolytic capacitor according to claim 3, wherein the cathode body lead-out portion is inserted into the second opening up to a midpoint in the lead-out direction.

5. 5. The electrolytic capacitor according to claim 1, wherein the first separator and the second separator are bonded to each other.

6. a plurality of the anode bodies, a plurality of the cathode bodies, and a plurality of the separators are provided, 6. The electrolytic capacitor according to claim 1, further comprising a binding member that binds the anode body, the cathode body, and the separator that are stacked together.

7. 7. The electrolytic capacitor according to claim 1, wherein the number of said cathode bodies is greater than the number of said anode bodies.

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