JP2013232570A - Electrochemical capacitor and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrochemical capacitor capable of preventing metal ions from being eluted into an electrolyte.SOLUTION: An electrochemical capacitor comprises a positive electrode and a negative electrode, a case, a lid, a coupling section, a power storage unit, and an electrolyte. The case includes wiring made of a metallic material with a positive standard electrode potential, and forms a space opened in a first direction. The lid blocks the space of the case from a first direction side, and is made of the metallic material with the positive standard electrode potential. The coupling section is sandwiched between the case and the lid, and is made of the metallic material with the positive standard electrode potential. The power storage unit has a positive electrode sheet, a negative electrode sheet, and a separate sheet, and is arranged in the space so that the negative electrode sheet is opposed to the lid. The electrolyte can permeate through the separate sheet, and is filled in the space together with the power storage unit.

Description

  The present invention relates to an electrochemical capacitor using LTCC and a method for manufacturing the same.

  In general electrochemical capacitors, as in other devices, a case made of high temperature co-fired ceramics (HTCC) is often used. HTCC is fired at a high temperature of about 1500 ° C. Therefore, Kovar or tungsten, which is not easily damaged by heat and has a low coefficient of linear expansion, is generally used for the HTCC wiring (see, for example, Patent Document 1).

  The case of the electrochemical capacitor is closed by a lid. A lid seals the inside of a case by being couple | bonded with a case via a coupling | bond part. The lid and the connecting portion are made of Kovar or tungsten, like the case wiring. As a result, the case, the coupling portion, and the lid are satisfactorily joined to each other by a joining method such as welding in which each metal material is thermally expanded with heating.

  The electrochemical capacitor contains a power storage unit and an electrolytic solution in a case. The power storage unit is sandwiched between the bottom surface in the case and the lid. A positive electrode current collector film is provided on the bottom surface in the case. On the other hand, on the negative electrode side, the lid also serves as the negative electrode current collector film. A positive electrode and a negative electrode are formed on the lower surface of the case of the electrochemical capacitor, and the positive electrode and the negative electrode are connected to the positive current collector film and the lid by the wirings, respectively.

JP 2001-216852 A

  Some electrochemical capacitors, such as an electric double layer capacitor, have an advantage that they can be used until their output voltage becomes zero. In such an electrochemical capacitor, when the output voltage becomes zero, the Kovar and tungsten forming the lid and the coupling portion are easily ionized and eluted into the electrolytic solution.

  If metal ions are eluted from the lid or the coupling portion into the electrolytic solution, an abnormality in electrical resistance in the power storage unit may occur. Further, the lid may be corroded and peeled off from the power storage unit, and the electrical resistance between the lid and the power storage unit may become abnormally high.

  In order to prevent such a problem, it is conceivable to form the lid and the coupling portion with a metal material that is difficult to ionize. However, if the metal material that forms the wiring used for HTCC is different from the metal material that forms the lid or the joint, the lid or the joint may not be satisfactorily bonded to the case due to the difference in the coefficient of linear expansion. .

  Patent Document 1 discloses a technique that uses different metal materials for wiring and lid used for HTCC. In this technique, a bonding material and a metal layer are provided between a case made of HTCC and a lid. The bonding material is formed of a solder material, and the metal layer is formed of a metal material similar to the lid. The bonding material and the metal layer are formed on the case by a reflow method or a plating method. Then, the lid is joined by a welding method or the like to the case where the joining material and the metal layer are formed.

  As described above, in order to use different metal materials for wiring and lid used for HTCC in an electrochemical capacitor, the manufacturing process becomes complicated and the manufacturing cost increases.

  In view of the circumstances as described above, an object of the present invention is to provide an electrochemical capacitor capable of preventing elution of metal ions into an electrolytic solution and a method for producing the same.

In order to achieve the above object, an electrochemical capacitor according to an embodiment of the present invention includes a positive electrode, a negative electrode, a case, a lid, a coupling portion, a power storage unit, and an electrolytic solution.
The case includes a wiring made of a first metal material having a positive standard electrode potential, and forms a space opened in the first direction.
The lid closes the space of the case from the first direction side, and a surface exposed to the space side is made of a second metal material having a positive standard electrode potential.
The coupling portion is sandwiched between the case and the lid, and a surface exposed to the space is made of a third metal material having a positive standard electrode potential.
The power storage unit includes a positive electrode sheet made of a material containing carbon, a negative electrode sheet made of the same material as the positive electrode sheet, and facing the positive electrode sheet, and a separate sheet that insulates the positive electrode sheet from the negative electrode sheet. The positive electrode sheet faces the bottom surface of the case facing the lid and the negative electrode sheet faces the lid so that the positive electrode sheet is connected to the positive electrode via the wiring. In addition, the negative electrode sheet is connected to the negative electrode via the lid, the coupling portion, and the wiring.
The electrolytic solution can pass through the separate sheet and is enclosed in the space together with the power storage unit.

In the method for manufacturing an electrochemical capacitor according to another aspect of the present invention, the first direction is obtained by laminating a plurality of ceramic sheets appropriately formed with a wiring made of a first metal material having a positive standard electrode potential. Forming a laminate that forms a space open to the surface.
A lid having a surface made of the second metal material having a positive standard electrode potential is formed.
The laminate is coated with a paste containing a second metal material having a positive standard electrode potential over the entire circumference of the opened end.
The laminate to which the paste is applied is baked to form the laminate as a case and the paste as a joint.
In the space of the case, a positive electrode sheet made of a material containing carbon, a negative electrode sheet made of the same material as the positive electrode sheet, and opposed to the positive electrode sheet, and a separate sheet that insulates the positive electrode sheet from the negative electrode sheet Is disposed such that the negative electrode sheet faces the first direction.
In the case, an electrolytic solution capable of passing through the separate sheet is placed in the space.
The case containing the power storage unit and the electrolytic solution is opposed to the surface of the lid from the first direction side.
The case facing the surface of the lid has the space closed by the lid when the surface of the lid is joined to the coupling portion, and the surface of the lid, the negative electrode sheet, Is faced.

1 is a perspective view of an electric double layer capacitor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line A-A ′ of the electric double layer capacitor shown in FIG. 1. It is sectional drawing which shows the manufacturing process of the electrical double layer capacitor shown in FIG. It is sectional drawing which shows the manufacturing process of the electrical double layer capacitor shown in FIG.

An electrochemical capacitor according to an embodiment of the present invention includes a positive electrode, a negative electrode, a case, a lid, a coupling portion, a power storage unit, and an electrolytic solution.
The case includes a wiring made of a first metal material having a positive standard electrode potential, and forms a space opened in the first direction.
The lid closes the space of the case from the first direction side, and a surface exposed to the space side is made of a second metal material having a positive standard electrode potential.
The coupling portion is sandwiched between the case and the lid, and a surface exposed to the space is made of a third metal material having a positive standard electrode potential.
The power storage unit includes a positive electrode sheet made of a material containing carbon, a negative electrode sheet made of the same material as the positive electrode sheet, and facing the positive electrode sheet, and a separate sheet that insulates the positive electrode sheet from the negative electrode sheet. The positive electrode sheet faces the bottom surface of the case facing the lid and the negative electrode sheet faces the lid so that the positive electrode sheet is connected to the positive electrode via the wiring. In addition, the negative electrode sheet is connected to the negative electrode via the lid, the coupling portion, and the wiring.
The electrolytic solution can pass through the separate sheet and is enclosed in the space together with the power storage unit.
According to this electrochemical capacitor, it is possible to prevent the metal material forming the lid and the joint from being ionized and eluted into the electrolytic solution.

The first metal material, the second metal material, and the third metal material may contain one or more elements selected from silver, gold, copper, and platinum as a main component.
According to this electrochemical capacitor, similarly to the above configuration, the metal material forming the lid and the coupling portion is prevented from being ionized and eluted into the electrolytic solution.

The first metal material, the second metal material, and the third metal material may all have silver as a main component.
According to this electrochemical capacitor, the manufacturing cost can be reduced.

The first metal material, the second metal material, and the third metal material may all have the same composition.
According to this electrochemical capacitor, the case, the joint, and the lid can be joined very well.

The lid may be formed of the second metal material, and the coupling portion may be formed of the third metal material.
According to this electrochemical capacitor, the manufacturing process can be simplified.

The positive electrode sheet and the negative electrode sheet may be formed of activated carbon.
According to this configuration, it is possible to provide an electric double layer capacitor capable of preventing the metal material forming the lid and the coupling portion from being ionized and eluted into the electrolytic solution.

The positive electrode sheet and the negative electrode sheet may be formed of a polyacene-based organic semiconductor.
According to this configuration, it is possible to provide a PAS (PolyAcetic Semiconductor) capacitor that can prevent the metal material forming the lid and the coupling portion from being ionized and eluted into the electrolytic solution.

In the method for manufacturing an electrochemical capacitor according to an embodiment of the present invention, a plurality of ceramic sheets appropriately formed with wirings made of a first metal material having a positive standard electrode potential are stacked in a first direction. Forming a laminate that forms an open space.
A lid having a surface made of the second metal material having a positive standard electrode potential is formed.
The laminate is coated with a paste containing a second metal material having a positive standard electrode potential over the entire circumference of the opened end.
The laminate to which the paste is applied is baked to form the laminate as a case and the paste as a joint.
In the space of the case, a positive electrode sheet made of a material containing carbon, a negative electrode sheet made of the same material as the positive electrode sheet, and opposed to the positive electrode sheet, and a separate sheet that insulates the positive electrode sheet from the negative electrode sheet Is disposed such that the negative electrode sheet faces the first direction.
In the case, an electrolytic solution capable of passing through the separate sheet is placed in the space.
The case containing the power storage unit and the electrolytic solution is opposed to the surface of the lid from the first direction side.
The case facing the surface of the lid has the space closed by the lid when the surface of the lid is joined to the coupling portion, and the surface of the lid, the negative electrode sheet, Is faced.
In this method for manufacturing an electrochemical capacitor, the formation of a paste, which is a joint between the case and the lid, can be performed simultaneously with the firing of the case. Therefore, the manufacturing process of the electrochemical capacitor that can prevent the metal material forming the lid and the joint from being ionized and eluted into the electrolytic solution is simplified.

The coupling portion may be joined to the paste by a welding method.
With this configuration, the lid can be easily coupled to the case.

The first metal material, the second metal material, and the third metal material may contain one or more elements selected from silver, gold, copper, and platinum as a main component.
This configuration also simplifies the manufacturing process of the electrochemical capacitor.

The first metal material, the second metal material, and the third metal material may all contain silver as a main component.
According to this configuration, the manufacturing cost can be reduced.

The first metal material, the second metal material, and the third metal material may all have the same composition.
According to this configuration, the case, the coupling portion, and the lid can be joined extremely well.

The lid may be formed of the second metal material.
According to this configuration, the manufacturing process can be simplified.

The positive electrode sheet and the negative electrode sheet may be formed of activated carbon.
With this configuration, it is possible to manufacture an electric double layer capacitor that can prevent the metal material forming the lid and the joint from being ionized and eluted into the electrolytic solution by a simple process.

The positive electrode sheet and the negative electrode sheet may be formed of a polyacene-based organic semiconductor.
With this configuration, it is possible to manufacture a PAS capacitor capable of preventing the metal material forming the lid and the coupling portion from being ionized and eluted into the electrolytic solution by a simple process.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an electric double layer capacitor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of the electric double layer capacitor shown in FIG. In the drawings, an X axis, a Y axis, and a Z axis that are orthogonal to each other are shown, and these are common axes in all drawings.

[Schematic configuration]
An electric double layer capacitor 10 according to an embodiment of the present invention includes a case 11, a coupling portion 18, and a lid 12. The case 11 and the lid 12 have a function as a casing of the electric double layer capacitor 10.

  The case 11 is formed in a rectangular parallelepiped shape, and forms a space 11a opened upward in the Z-axis direction. The space 11a is surrounded by a bottom surface 11b of the case 11 and an inner side surface 11c having a rectangular opening shape.

  The coupling portion 18 is formed over the entire circumference of the upper edge portion of the case 11 in the Z-axis direction. The coupling portion 18 is provided to bring the case 11 and the lid 12 into close contact.

  The lid 12 is a rectangular flat plate that is joined to the coupling portion 18 and covers a region surrounded by the coupling portion 18. The peripheral edge of the lid 12 is slightly recessed toward the case 11, and the peripheral edge is joined to the coupling portion 18. As a result, the space 11 a in the case 11 is airtightly and liquid tightly closed by the lid 12.

  The electric double layer capacitor 10 includes a power storage unit 13 and an electrolytic solution. The power storage unit 13 and the electrolytic solution are sealed in the space 11 a of the case 11.

  The power storage unit 13 has three rectangular sheets of a positive electrode sheet 13a, a negative electrode sheet 13b, and a separate sheet 13c. Both the positive electrode sheet 13a and the negative electrode sheet 13b are formed of activated carbon. The separate sheet 13c is sandwiched between the positive electrode sheet 13a and the negative electrode sheet 13b, and insulates the positive electrode sheet 13a and the negative electrode sheet 13b. The power storage unit 13 is disposed such that the positive electrode sheet 13 a faces the bottom surface 11 b of the case 11 and the negative electrode sheet 13 b faces the lid 12.

  As the electrolytic solution, a general one can be used. The combination of the salt and solvent used for the electrolytic solution can be determined as appropriate. As an electrolytic solution, for example, propylene carbonate can be used as a solvent, and ethylmethylimidazolium tetrafluoroborate can be used as a salt. The salt concentration of the electrolytic solution can be set to 2 mol / l, for example.

  The electric double layer capacitor 10 includes a positive electrode current collector film 19 that is a current collector film on the positive electrode side of the power storage unit 13. The positive electrode current collector film 19 is formed on the bottom surface 11 b of the case 11. In the electric double layer capacitor 10, the lid 12 also functions as a negative electrode current collector film.

  Conductive adhesive layers 20 and 21 are formed on both surfaces of the power storage unit 13 facing the Z-axis direction. That is, the conductive adhesive layer 20 is formed on the positive electrode sheet 13 a of the power storage unit 13, and the conductive adhesive layer 21 is formed on the negative electrode sheet 13 b of the power storage unit 13. The conductive adhesive layers 20 and 21 are formed of a resin material having adhesiveness and conductivity. The conductive adhesive layer 20 is bonded to the positive electrode current collector film 19, and the conductive adhesive layer 21 is bonded to the lid 12. Thereby, the positive electrode sheet 13a and the positive electrode current collector film 19 are electrically connected, and the negative electrode sheet 13b and the lid 12 are electrically connected.

  A positive electrode 14 and a negative electrode 15 are formed on the lower surface of the case 11 in the Z-axis direction. In the case 11, a positive electrode wiring 16 that connects the positive electrode 14 to the positive electrode current collector film 19 is formed. Further, the case 11 is provided with a negative electrode wiring 17 for connecting the negative electrode 15 to the lid 12. The negative electrode wiring 17 penetrates the side wall of the case 11 from the negative electrode 15 in the Z-axis direction, and is connected to the lid 12 through the coupling portion 18.

  The electric double layer capacitor 10 can store power in the power storage unit 13 by applying a voltage between the positive electrode 14 and the negative electrode 15 with the above configuration, and can store the power stored in the power storage unit 13 as the positive electrode. 14 and the negative electrode 15.

[Configuration of lid and connecting part]
The lid 12 and the coupling portion 18 of the electric double layer capacitor 10 are formed of a metal material whose standard electrode potential (the potential of the standard hydrogen electrode is assumed to be a reference (0 volt)) is positive. Specifically, the lid 12 and the connecting portion 18 are formed of a metal material whose main component is silver. Note that the lid 12 and the coupling portion 18 are not limited to silver, and may be formed of, for example, a metal material containing as a main component at least one selected from silver, gold, copper, and platinum.

  When the lid and the joint are made of a metal material with a negative standard electrode potential (for example, Kovar or tungsten), the metal material ionizes and elutes into the electrolyte when the lid and the joint come into contact with the electrolyte. It's easy to do. In particular, when the electric double layer capacitor is discharged to 0 volts, the metal material forming the lid and the joint is easily ionized.

  On the other hand, since the lid 12 and the coupling portion 18 of the electric double layer capacitor 10 according to the present embodiment are formed of a metal material having a positive standard electrode potential, even if the lid 12 and the coupling portion 18 are in contact with the electrolytic solution. Metal materials are difficult to ionize. Therefore, the electric double layer capacitor 10 can prevent the metal material forming the lid 12 and the coupling portion 18 from being ionized even when discharged to 0 volts.

  In addition, the lid 12 and the coupling portion 18 are as described above if only the surface exposed to the space 11c in contact with the electrolytic solution (the surface indicated by the thick line B) is formed of a metal material having a positive standard electrode potential. Similar effects can be obtained. The lid 12 and the connecting portion 18 may be formed of, for example, Kovar, and a metal layer made of a metal material having a positive standard electrode potential may be formed on the surface indicated by the thick line B.

  The metal layer can be formed by, for example, a plating method, a cladding method, a sputtering method, or a vapor deposition method. Specifically, a metal layer made of gold is formed by performing gold plating after tin plating is applied to the lid 12 and the coupling portion 18 made of kovar.

[Case structure]
The case 11 of the electric double layer capacitor 10 is made of low temperature co-fired ceramics (LTCC). The material used for the base material of LTCC is a ceramic that can be fired at a low temperature of about 900 ° C., for example, a material in which glass-based components are mixed with alumina. Therefore, restrictions on heat resistance and linear expansion coefficient are greatly reduced for the LTCC wiring, so that a wide variety of metal materials can be selected.

  In the electric double layer capacitor 10 according to the present embodiment, the LTCC wiring is formed of the same metal material as the lid 12 and the coupling portion 18. That is, the LTCC wiring is formed of a metal material having a positive standard electrode potential. As a result, the LTCC wiring, the coupling portion 18, and the lid 12 can be satisfactorily bonded to each other.

  With reference to FIG. 2, the structure of the electrode and wiring in case 11 of electric double layer capacitor 10 will be described. The positive electrode 14 and the negative electrode 15 are formed at both ends in the Y-axis direction of the lower surface of the case 11 in the Z-axis direction.

  The positive electrode 14 is drawn out to the outer surface of the case 11, extends upward in the Z-axis direction along the outer surface of the case 11, and further extends to the positive electrode wiring 16 in the Y-axis direction toward the inside of the case 11. In the case 11, the positive electrode 14 extends to the positive wiring 16, but the configuration of the positive electrode 14 is not essential. For example, the positive electrode 14 may be arranged on the lower surface in the Z-axis direction of the case 11, and a wiring connecting the positive electrode 14 and the positive wiring 16 may be formed separately from the positive electrode 14. The positive wiring 16 is configured as a via extending in the Z-axis direction that connects the positive electrode 14 and the positive current collecting film 19.

  The negative electrode 15 is drawn to the outer surface of the case 11, extends upward in the Z-axis direction along the outer surface of the case 11, and further extends a predetermined distance toward the inside of the case 11 in the Y-axis direction. The negative electrode 15 is connected to the negative wiring 17 inside the side wall of the case 11, and the negative wiring 17 penetrates to the upper end of the side wall of the case 11. The negative electrode wiring 17 is joined to the coupling portion 18 at the upper end portion of the side wall of the case 11. The configurations of the negative electrode 15 and the negative electrode wiring 17 are not limited to this configuration, and the negative electrode 15 may be disposed on the lower surface of the case 11 and the negative electrode wiring 17 may be connected to the coupling portion 18.

[Relationship between lid and joint configuration and case configuration]
It is desirable that the first metal material forming the LTCC wiring, the second metal material forming the lid 12, and the third metal material forming the coupling portion 18 have the same composition. In this case, the LTCC wiring, the coupling portion 18 and the lid 12 can be bonded to each other very well. However, the first material, the second material, and the third material may have different compositions.

  In addition, when the coupling portion 18 is manufactured by the method of forming a metal layer made of a metal material having a positive standard electrode potential as described above, in addition to the surface indicated by the thick line B, A metal layer is also formed on the lower surface in the Z-axis direction (the surface indicated by the thick broken line C in FIG. 2). Thereby, the favorable joining with the wiring of LTCC and the coupling | bond part 18 is ensured.

[Method of manufacturing electric double layer capacitor]
First, the manufacturing process of the case 11 and the coupling portion 18 will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a manufacturing process of the case 11 and the coupling portion 18 of the electric double layer capacitor 10.

  First, as shown in FIG. 3A, unfired ceramic sheets 111, 211, 311, and 411 are laminated in this order from the lower side in the Z-axis direction to form a laminate. The positive electrode 14 and the negative electrode 15 are formed in advance on the ceramic sheet 111, and the positive wiring 16 and the positive current collecting film 19 are formed in advance on the ceramic sheet 211. The positive electrode 14 is configured as a via penetrating the ceramic sheet 211. A negative electrode wiring 17 is formed in advance on the ceramic sheets 211, 311, and 411. The ceramic sheets 311 and 411 are processed into a predetermined shape.

  Next, as illustrated in FIG. 3B, an unfired bonding portion 118 is applied to the upper surface in the Z-axis direction of the ceramic sheet 411. For the coupling portion 118, a metal paste in which a powder of silver, gold, copper, platinum or the like is pasted with an organic solvent or the like is used.

  Next, as shown in FIG. 3C, the case 11 and the coupling portion 18 are simultaneously formed by firing the laminate shown in FIG. The laminate was fired by holding at 900 ° C. for 12 hours. In addition, the baking temperature and baking time of a laminated body can be determined suitably, for example, a baking temperature can be 800 to 1000 degreeC and a baking time can be 5 to 15 hours.

  Thus, in the present embodiment, the joint portion 18 is fired simultaneously with the case 11. Therefore, the manufacturing process of the electric double layer capacitor 10 according to the present embodiment requires fewer man-hours than the manufacturing process in which the case is fired and the joint is formed individually. Therefore, in this embodiment, simplification of the manufacturing process of the electric double layer capacitor 10 is realized.

  In the present embodiment, the case 11 is formed of four ceramic sheets, but the number of ceramic sheets can be determined as appropriate. In FIG. 3, only a single case 11 is shown for convenience of explanation. However, the case 11 can be baked in a state of being connected along an uncut XY plane. In this case, the fired case 11 is separated into pieces by dicing.

  Moreover, the method of forming the part exposed to the outer surface of case 11 in each electrode and wiring after baking of case 11 can also be taken. In this case, for example, a plating method can be used for forming the electrodes and wirings.

  Next, a manufacturing process after manufacturing the case 11 in the electric double layer capacitor 10 will be described with reference to FIG. FIG. 3 is a cross-sectional view showing a manufacturing process of the electric double layer capacitor 10.

  First, as shown in FIG. 4A, the power storage unit 13 is arranged in the case 11 shown in FIG. Specifically, the positive electrode sheet 13 a is opposed to the positive electrode current collector film 19 via the conductive adhesive layer 20 to bond the conductive adhesive layer 20 and the positive electrode current collector film 19. At this time, the negative electrode sheet 13b faces upward in the Z-axis direction.

  Next, as shown in FIG. 4B, the case 11 is closed from above in the Z-axis direction by the lid 12 to complete the electric double layer capacitor 10. The lid 12 and the joint 18 are joined by a welding method. At this time, the positive electrode current collector film 19 is connected to the positive electrode sheet 13 a of the power storage unit 13 through the conductive adhesive layer 20, and the lid 12 is connected to the negative electrode sheet 13 b of the power storage unit 13 through the conductive adhesive layer 21. Yes.

  Various welding methods can be employed for joining the lid 12 and the joint 18. Examples of such a welding method include seam welding and laser welding. Moreover, the joining method of the lid 12 and the joining part 18 is not restricted to a welding method. Examples of the joining method other than the welding method include pressure welding and brazing.

[Other Embodiments]
The embodiment of the present invention has been described above, but the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

  For example, the electrochemical capacitor to which the present invention is applicable is not limited to an electric double layer capacitor. As long as the positive electrode sheet and the negative electrode sheet of the electricity storage unit 13 are formed of the same material containing carbon and can be discharged to 0 volts, the electrochemical capacitor can obtain the same effects as the present embodiment.

  An example of such an electrochemical capacitor is a PAS (Poly Acid Semiconductor) capacitor. In this case, both the positive electrode sheet 13a and the negative electrode sheet 13b of the electricity storage unit 13 may be formed of a polyacene organic semiconductor.

DESCRIPTION OF SYMBOLS 10 ... Electric double layer capacitor 11 ... Case 12 ... Lid 13 ... Power storage unit 13a ... Positive electrode sheet 13b ... Negative electrode sheet 13c ... Separate sheet 14 ... Positive electrode 15 ... Negative electrode 16 ... Positive electrode wiring 17 ... Negative electrode wiring 18 ... Coupling part 19 ... Positive electrode current collector film 20, 21 ... conductive adhesive layer

Claims (15)

A positive electrode and a negative electrode;
A case including a wiring made of a first metal material having a positive standard electrode potential and forming a space opened in a first direction;
A lid made of a second metal material having a standard electrode potential positive, the surface of the case closing the space from the first direction side, and the surface exposed to the space side;
A surface sandwiched between the case and the lid and exposed to the space side is a joint made of a third metal material having a positive standard electrode potential,
A positive electrode sheet made of a material containing carbon, a negative electrode sheet made of the same material as the positive electrode sheet, and a separate sheet that insulates the positive electrode sheet from the negative electrode sheet. The negative electrode sheet is disposed in the space so as to face a bottom surface of the case facing the lid, and the positive electrode sheet is connected to the positive electrode via the wiring and the negative electrode A power storage unit in which a sheet is connected to the negative electrode through the lid, the coupling portion, and the wiring, and
An electrolyte solution that is permeable through the separate sheet and enclosed in the space together with the power storage unit;
An electrochemical capacitor comprising: The electrochemical capacitor according to claim 1,
The first metal material, the second metal material, and the third metal material are electrochemical capacitors whose main component is one or more elements selected from silver, gold, copper, and platinum. The electrochemical capacitor according to claim 2,
The first metal material, the second metal material, and the third metal material are all electrochemical capacitors mainly composed of silver. The electrochemical capacitor according to any one of claims 1 to 3,
The first metal material, the second metal material, and the third metal material all have the same composition. The electrochemical capacitor according to any one of claims 1 to 4,
The lid is formed of the second metal material;
The coupling portion is an electrochemical capacitor formed of the third metal material. The electrochemical capacitor according to any one of claims 1 to 5,
The positive electrode sheet and the negative electrode sheet are electrochemical capacitors made of activated carbon. The electrochemical capacitor according to any one of claims 1 to 5,
The positive electrode sheet and the negative electrode sheet are electrochemical capacitors made of a polyacenic organic semiconductor. By laminating a plurality of ceramic sheets appropriately formed with a wiring made of the first metal material having a positive standard electrode potential, a laminated body that forms a space opened in the first direction is formed.
Forming a lid having a surface made of a second metal material having a positive standard electrode potential;
Applying a paste containing a third metal material having a positive standard electrode potential over the entire circumference of the open end of the laminate,
Firing the laminate coated with the paste, the laminate as a case and the paste as a joint,
A negative electrode sheet made of a material containing carbon, a negative electrode sheet made of the same material as the positive electrode sheet, facing the positive electrode sheet, and a separate sheet that insulates the positive electrode sheet from the negative electrode sheet. Arranging the seat in the space of the case so that the sheet faces the first direction;
An electrolyte that can penetrate the separate sheet is placed in the space of the case,
From the first direction side, the surface of the lid is opposed to the case containing the power storage unit and the electrolytic solution,
A method for manufacturing an electrochemical capacitor, wherein the surface of the lid is closed by the surface of the lid and the surface of the lid faces the negative electrode sheet by joining the surface of the lid to the coupling portion. A method for producing an electrochemical capacitor according to claim 8,
A method for manufacturing an electrochemical capacitor, wherein the surface of the lid is joined to the joint by a welding method. A method for producing an electrochemical capacitor according to claim 8 or 9,
The method for producing an electrochemical capacitor, wherein the first metal material, the second metal material, and the third metal material are mainly composed of one or more elements selected from silver, gold, copper, and platinum. It is a manufacturing method of the electrochemical capacitor according to claim 10,
The first metal material, the second metal material, and the third metal material are all made of silver as a main component. It is a manufacturing method of the electrochemical capacitor according to any one of claims 8 to 11,
The first metal material, the second metal material, and the third metal material all have the same composition. The method for producing an electrochemical capacitor according to any one of claims 8 to 12,
A method for manufacturing an electrochemical capacitor, wherein the lid is formed of the second metal material. A method for producing an electrochemical capacitor according to any one of claims 8 to 13,
The method for producing an electrochemical capacitor, wherein the positive electrode sheet and the negative electrode sheet are made of activated carbon. A method for producing an electrochemical capacitor according to any one of claims 8 to 13,
The method for producing an electrochemical capacitor, wherein the positive electrode sheet and the negative electrode sheet are made of a polyacene organic semiconductor.

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