JP2008186945A - Electrical double-layer capacitor and manufacturing method of electrical double-layer capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrical double-layer capacitor which highly withstands voltage within a limited space. <P>SOLUTION: The electrical double-layer capacitor includes a first and a second capacitor cell 1 and 2 and a storage container 3 for storing the first, and second capacitor cells 1 and 2. The first and second capacitor cells 1 and 2 respectively comprise: a plate-like separator 11 and 21; first solid electrolyte film 12a and 22a disposed on the surface of the separator; second solid electrolyte film 12b and 22b disposed on the rear face of the separator; first electrode 13a and 23a consisting of an active carbon electrode disposed on the first solid electrolyte film; second electrode 13b and 23b consisting of an active carbon electrode disposed below the second solid electrolyte film; first collector 14a and 24a connected to the first electrode; and second collector 14b and 24b connected to the second electrode. The first and second capacitor cells 1 and 2 are electrically connected in series. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electric double layer capacitor using a solid electrolyte membrane and a method for manufacturing the electric double layer capacitor.

  The electric double layer capacitor is used as a backup power source and auxiliary power source for cellular phones and household electric appliances as a small and large capacity capacitor. An electric double layer capacitor is formed by disposing a separator between a pair of positive and negative electrodes and filling the periphery with an electrolytic solution. Usually, a pair of positive and negative electrodes (called “cells”) sandwiching the separator are arranged in a storage container, and the storage container is filled with an electrolyte. In addition, one cell is stored in one storage container. As performance required for such an electric double layer capacitor, in addition to a large capacitance, high withstand voltage performance can be mentioned.

  To increase the withstand voltage of the electric double layer capacitor, increase the breakdown voltage of the electrolyte (widen the potential window) to increase the withstand voltage per cell, or connect multiple cells electrically in series. is required.

Conventionally, an electrolytic solution having a wide potential window in which an electrolyte such as tetraethylammonium tetrafluoride salt is dissolved in a solvent such as propylene carbonate has been used as the electrolytic solution, but the withstand voltage per cell is limited to about 3V. In order to increase the withstand voltage per cell, it is necessary to develop a new electrolyte.
JP-A-5-308034

  On the other hand, in order to electrically connect a plurality of cells in series, it is necessary to arrange and connect a plurality of storage containers on the mounting surface of the mounting substrate. Therefore, in this case, a space for arranging a plurality of independent storage containers is required. In addition, if a plurality of cells are stored in one storage container and these cells are connected in series, the plurality of cells share the electrolyte in the storage container. Therefore, since the high-potential side cell and the low-potential side cell use a common electrolytic solution in the storage container, the withstand voltage of the entire capacitor cannot be increased due to the restriction of the decomposition voltage of the electrolytic solution.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an electric double layer capacitor capable of obtaining a high withstand voltage in a limited space and a method for manufacturing the electric double layer capacitor. That is.

  According to a first aspect of the present invention, there is provided an electric double layer capacitor including first and second capacitor cells and a storage container for storing the first and second capacitor cells, wherein the first and second capacitors are provided. Each of the cells includes a plate-shaped separator, a first solid electrolyte membrane disposed on the surface of the separator, a second solid electrolyte membrane disposed on the back surface of the separator, and a first solid electrolyte membrane. A first electrode comprising an activated carbon electrode disposed above; a second electrode comprising an activated carbon electrode disposed under the second solid electrolyte membrane; and a first current collector connected to the first electrode. And a second current collector connected to the second electrode, wherein the first and second capacitor cells are electrically connected in series. Here, the first electrode and the second electrode are electrodes having opposite polarities. When the first electrode is a positive electrode, the second electrode is a negative electrode, and the first electrode is a negative electrode. The second electrode becomes the positive electrode.

  A second feature of the present invention is a plate-shaped separator, a first solid electrolyte membrane disposed on the surface of the separator, a second solid electrolyte membrane disposed on the back surface of the separator, A first electrode comprising an activated carbon electrode disposed on the solid electrolyte membrane; a second electrode comprising an activated carbon electrode disposed below the second solid electrolyte membrane; and a first electrode connected to the first electrode. Manufacturing a first capacitor cell and a second capacitor cell each including a first current collector and a second current collector connected to a second electrode, and a container for storing the first and second capacitor cells And a step of electrically connecting the first and second capacitor cells in series with each other.

  By disposing the first and second solid electrolyte membranes between the first and second electrodes and the separator, respectively, no electrolyte is required. Therefore, even if the first and second capacitor cells are electrically connected in series, the high-potential side cell and the low-potential side cell do not use a common electrolyte in the storage container. Therefore, the withstand voltage of the entire capacitor including the first and second capacitor cells electrically connected in series can be increased within a limited space of one storage container.

  In the present invention, the number of capacitor cells stored in one storage container is not limited to two. It is sufficient that at least two capacitor cells (first and second capacitor cells) are stored in one storage container, and three or more capacitors (third capacitor cell, fourth capacitor cell,...) Are provided. You may arrange | position in the same storage container. Furthermore, the third capacitor cell, the fourth capacitor cell,... May be connected in series to the first and second capacitor cells.

  In the first and second aspects of the present invention, the first and second capacitor cells share one separator, and the separator blocks conduction of ions and electrons between the first and second capacitor cells. It is desirable to provide a boundary. Since the first and second capacitor cells share one separator, the relative position between the first and second capacitor cells can be fixed using the separator. Further, since the boundary portion blocks the conduction of ions and electrons, no ion conduction or electron conduction occurs between the first and second capacitor cells via the separator.

  In the first and second features of the present invention, four terminals for taking out each potential of the first current collector and the second current collector included in the first and second capacitor cells to the outside of the storage container are further provided. It is desirable to provide. Of the four terminals, a terminal for extracting the potential of the first current collector of the first capacitor cell and a terminal for extracting the potential of the first current collector or the second current collector of the second capacitor cell By connecting, the first and second capacitor cells can be electrically connected in series or in parallel. Therefore, since the terminals can be freely connected outside the storage container, the withstand voltage of the electric double layer capacitor and the design freedom of the capacitance are improved.

  In the present invention, the number of terminals is not limited to four. It is sufficient that at least four terminals are taken out from one storage container. When three or more capacitors (third capacitor cell, fourth capacitor cell,...) Are arranged in the same storage container, You may further provide the terminal which takes out each electric potential of the 1st and 2nd electrical power collector of these capacitors.

  In the first and second aspects of the present invention, the first current collector included in the first capacitor cell is connected to the first current collector or the second current collector included in the second capacitor cell. It doesn't matter. Thereby, the collectors of the first capacitor cell and the second capacitor cell can be connected in the storage container, and the first and second capacitor cells can be electrically connected in series. Since they are connected in series in the storage container, external terminals for series connection and wiring for connecting the external terminals are not necessary.

  ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the electrical double layer capacitor which can obtain a high withstand voltage within the limited space, and an electrical double layer capacitor can be provided.

Embodiments of the present invention will be described below with reference to the drawings. In the description of the drawings, the same parts are denoted by the same reference numerals.
(First embodiment)
The configuration of the electric double layer capacitor according to the first embodiment of the present invention will be described with reference to FIG. The electric double layer capacitor includes a first capacitor cell 1 and a second capacitor cell 2 and a storage container 3 for storing the first and second capacitor cells 1 and 2. The first capacitor cell 1 includes a plate-shaped separator 11, a first solid electrolyte membrane 12 a disposed on the surface of the separator 11, and a second solid electrolyte membrane 12 b disposed on the back surface of the separator 11. A first electrode 13a composed of an activated carbon electrode disposed on the first solid electrolyte membrane 12a, a second electrode 13b composed of an activated carbon electrode disposed below the second solid electrolyte membrane 12b, A first current collector 14a connected to one electrode 13a, and a second current collector 14b connected to the second electrode 13b. Similarly, the second capacitor cell 2 includes a plate-shaped separator 21, a first solid electrolyte membrane 22 a disposed on the surface of the separator 21, and a second solid electrolyte disposed on the back surface of the separator 21. The membrane 22b, the first electrode 23a made of activated carbon electrode disposed on the first solid electrolyte membrane 22a, and the second electrode 23b made of activated carbon electrode arranged under the second solid electrolyte membrane 22b And a first current collector 24a connected to the first electrode 23a, and a second current collector 24b connected to the second electrode 23b. The storage container 3 includes a housing 31 in which the first and second capacitor cells 1 and 2 are disposed, and a cap 32 for hermetically sealing the inside of the housing 31.

  In the first embodiment, the first and second capacitor cells 1 and 2 are stored by connecting the first current collector 14a and the first current collector 24a inside the storage container 3. The container 3 is electrically connected in series. Therefore, the second electrode 13b of the first capacitor cell 1 and the second electrode 23b of the second capacitor cell 2 form a pair of positive and negative electrodes of the entire electric double layer capacitor, and the second current collector 14b. , 24b are connected to terminals 15b, 25b, respectively. The potentials of the second electrode 13b of the first capacitor cell 1 and the second electrode 23b of the second capacitor cell 2 are taken out of the storage container 3 from the terminals 15b and 25b.

  In the first embodiment, the first and second capacitor cells 1, 2 share one separator (11, 21), and the separator is the first and second capacitor cells 1, 2. Insulating boundary 33 is provided to block conduction of ions and electrons between them. That is, the separator 11 and the separator 21 are integrally formed, and the boundary portion 33 is formed at the boundary portion between the first and second capacitor cells 1 and 2. As a material for the separator, a polyethylene nonwoven fabric or the like can be used.

  The solid electrolyte membranes 12a, 12b, 22a, 22b are preferably made of a material having high ionic conductivity. For example, a molten salt polymer of N-ethylimidazolium vinyl sulfonic acid disclosed in JP 2000-3620 A, and N-vinyl imidazolium fluoroboronic acid disclosed in JP 2000-11653 A A salt polymer or the like can be used. The molten salt polymer of N-ethylimidazolium vinyl sulfonic acid and the N-vinyl imidazolium fluoroborate polymer are materials having a glass transition temperature close to the use temperature of the electric double layer capacitor. When such a material is used as the solid electrolyte membranes 12a, 12b, 22a, and 22b, if a plurality of capacitor cells are used side by side without using a separator in one storage container 3, the solid electrolyte membrane 12a is increased as the temperature rises. , 12b, 22a, and 22b increase, and individual capacitor cells cannot be isolated, resulting in a short circuit. In order to avoid this, by using a common separator for a plurality of capacitor cells, the positive and negative electrodes can be separated and the adjacent capacitor cells 1 and 2 can be separated simultaneously.

  Next, a method for manufacturing the electric double layer capacitor of FIG. 1 will be described. First, a method for producing a polarizable electrode (activated carbon electrode) sheet to be the electrodes 13a, 13b, 23a, 23b and a solid electrolyte polymer to be the solid electrolyte membranes 12a, 12b, 22a, 22b will be described.

(Ii) 5 parts by weight of acetylene black (AB) as a conductive material and polytetrafluoroethylene (as a binder) with respect to 100 parts by weight of activated carbon obtained by steam activation using palm glass having a specific surface area of 1000 m ² / g PTFE) 5 parts by weight are sufficiently kneaded and stretched into a sheet until the thickness becomes 0.05 mm. The polarizable electrode sheet is completed by the above procedure.

  (B) A method for producing poly (N-ethylimidazolium ethylenesulfonic acid) as a solid electrolyte polymer is as follows. First, N-ethylimidazole and a vinylsulfonic acid aqueous solution having a concentration of 25% are mixed and stirred for 3 hours while maintaining at 0 ° C. Then, excess water is removed from the liquid mixture, and the solvent is concentrated. The solvent is dropped into the stirring ether, and the precipitated crystals are collected and dried to give N-ethylimidazolium vinylsulfonic acid. A salt is obtained. The melting point of N-ethylimidazolium vinyl sulfonate is −10 ° C.

  (C) Then, N-ethylimidazolium vinyl sulfonic acid is dissolved in methanol and polymerized. At this time, azobisisobutyronitrile is added as a polymerization initiator at a ratio of 1% with respect to the vinyl group. By performing radical polymerization for 3 hours while maintaining the temperature at 65 ° C., an N-ethylimidazolium ethylene sulfonic acid polymer represented by Chemical Formula 1 of JP-A-2000-3620 is obtained.

  Next, a method for manufacturing the first and second capacitor cells 1 and 2 will be described with reference to FIGS.

  (1) First, a polarizable electrode sheet 41 is prepared as shown in FIG. 2A, and N-ethyl as a solid electrolyte polymer 42 is formed on the polarizable electrode sheet 41 as shown in FIG. Develop methanol solution of imidazolium ethylene sulfonate polymer.

  (2) By drying this, a laminate of an electrode and a solid electrolyte is formed. And as shown in FIG.2 (c), a laminated body is cut | disconnected so that one piece may become 1.8 mm x 3.6 mm. As shown in FIG. 2D, the two laminated bodies 43b and 43d cut are arranged so that the solid electrolyte is on top.

  (3) A separator (11, 21) is disposed thereon as shown in FIG. At this time, a separator (11, 21) in which a boundary portion 33 is formed between the stacked bodies 43b and 43d is used so that the solid electrolyte is immersed and ions and electrons are not exchanged between the stacked bodies. The separators (11, 21) are arranged so that the boundary portion 33 separates the stacked bodies 43b, 43d. In addition, the boundary part 33 which has a precise | minute film-like structure with low liquid permeability can be formed by pressurizing the part corresponding to the boundary part 33 of a separator (11, 21) with the iron heated to 200 degreeC. it can. On the separator (11, 21), the other two laminated bodies 43a, 43c are arranged with the solid electrolyte facing down so as to face the laminated bodies 43b, 43d.

  (4) The pressure is reduced to -30 kPa with respect to the atmospheric pressure. Further, the first and second capacitor cells 1 and 2 are obtained as shown in FIG. 2 (f) by being sandwiched between stainless plates and pressurized in the vertical direction at about 200 kPa.

  Next, a procedure for storing the first and second capacitor cells 1 and 2 in the storage container 3 will be described with reference to FIGS.

  (A) First, a casing 31 made of alumina ceramic having a thickness of 0.050 mm is prepared. The dimensions of the housing 31 are length 5.0 mm × width 5.0 mm × height 2.0 mm. Note that the casing 31 has a layered structure, and a wiring pattern that becomes the second current collectors 14b and 24b on the bottom surface of the casing 31 in advance as shown in FIGS. 3 (a) and 3 (b). Is formed. The wiring pattern penetrates through the side wall of the housing 31 and extends to the back surface side to form the terminals 15 and 25. As the wiring pattern, a tungsten surface plated with gold is used.

  (B) A conductive paste is applied on the wiring pattern, and as shown in FIGS. 3 (c) and 3 (d), the first electrodes 13b and 23b are in contact with the wiring pattern. The second capacitor cells 1 and 2 are attached to the bottom surface of the housing 31. And it heat-processes on the conditions which the binder in an electrically conductive paste solidifies.

(C) Thereafter, an insulating cap 32 made of ceramics in which a conductive material is coated in a shape as shown in FIG. This conductive material corresponds to the first current collectors 14a and 24a. And as shown in FIG.3 (f) and FIG.3 (g), airtight sealing is performed using the solder glass in the junction part of the cap 32 and the housing | casing 31. FIG. The electric double layer capacitor shown in FIG. 1 is completed by the above procedure.
(Experimental example)
The inventors conducted a charge / discharge experiment using the electric double layer capacitor according to the first embodiment of the present invention manufactured by the above manufacturing method. At the same time, a similar experiment was performed as a comparative example for a conventional electric double layer capacitor in which the capacitor cell was not divided in the storage container.

  First, a method for manufacturing an electric double layer capacitor according to a comparative example will be described. The electric double layer capacitor according to the comparative example is formed by storing one capacitor cell in one storage container and filling the storage container with an electrolyte solution. Specifically, as shown in FIGS. 4A to 4C, current collectors 74 and 64 are formed on the bottom surface of the casing 81 and the inner surface of the cap 82, respectively. Terminals 65 and 75 connected to 64 are formed so as to be located outside the storage container. As shown in FIG. 4D to FIG. 4F, the positive electrode 63 and the negative electrode 73 are pasted on the current collector 64 and the current collector 74, respectively. The positive electrode 63 and the negative electrode 73 are polarizable electrodes using activated carbon, and are the same electrode sheets as those in the above-described embodiment, which are cut into 3.6 mm square sizes for the positive electrode and the negative electrode, respectively. . As shown in FIGS. 4 (g) and 4 (h), an appropriate amount of a propylene carbonate solution of tetraethylammonium tetrafluoroborate (concentration 1 mol / L) is injected as an electrolyte into the storage container. The casing 81 and the cap 82 are overlapped so that the separator 61 is sandwiched between the positive electrode 63 and the negative electrode 73, and hermetically sealed using solder glass in a dry environment. In addition, the separator 61 uses the nonwoven fabric made from polyethylene similarly to embodiment.

  Next, an experimental method will be described. The positive and negative terminals of the electric double layer capacitor were connected to the anode and the cathode, respectively, and charged and discharged in a constant current mode. Specifically, charging is started from 0V while keeping the current constant, and the voltage is increased up to 5V. In the discharge, the cut-off voltage is set to 0V.

  As a result of the above experiment, the electric double layer capacitor according to the first embodiment of the present invention was able to charge / discharge normally from 0V to 5V. Furthermore, when charging / discharging was repeated 1000 times under the same conditions, the discharge capacity retention rate was 80% or more of the initial capacity. On the other hand, in the electric double layer capacitor according to the comparative example, the voltage increase stopped in the vicinity of 4 V during charging, and no further charging was possible. Thus, when the charge / discharge voltage range was 0 V to 3.5 V and charge / discharge was repeated 1000 times, the discharge capacity retention rate was 40% or less of the initial capacity.

  From the above experimental results, the electric double layer capacitor according to the first embodiment of the present invention has a higher withstand voltage in charge and discharge than the electric double layer capacitor according to the comparative example, and has a discharge capacity with respect to the initial capacity. It was found that the maintenance rate was high.

  As described above, according to the first embodiment of the present invention, the following operational effects can be obtained.

  The electric double layer capacitor according to the first embodiment of the present invention includes first and second capacitor cells 1 and 2 and a storage container 3 for storing the first and second capacitor cells 1 and 2. . The first and second capacitor cells 1 and 2 include plate-shaped separators 11 and 21, first solid electrolyte membranes 12 a and 22 a disposed on the surfaces of the separators 11 and 22, and separators 11 and 21, respectively. Second solid electrolyte membranes 12b and 22b disposed on the back surface of the first solid electrolyte membrane 12a, first electrodes 13a and 23a made of activated carbon electrodes disposed on the first solid electrolyte membrane 12a, and a second solid Second electrodes 13b and 23b made of activated carbon electrodes arranged under the electrolyte membranes 12b and 22b, first current collectors 14a and 24a connected to the first electrodes 13a and 23a, and a second electrode And second current collectors 14b and 24b connected to 13b and 23b. The first and second capacitor cells 1 and 2 are electrically connected in series.

  Since the first and second solid electrolyte membranes 12a, 22a, 12b, and 22b are respectively disposed between the first and second electrodes 13a, 23a, 13b, and 23b and the separators 11 and 21, no electrolyte is required. It becomes. Therefore, even if the first and second capacitor cells 1 and 2 are electrically connected in series, the high-potential side cell and the low-potential side cell use the same electrolyte in the storage container 3. There is no. Therefore, the withstand voltage of the entire capacitor including the first and second capacitor cells 1 and 2 electrically connected in series can be increased within a limited space of one storage container 3.

  Specifically, a capacitor in which electrodes and a solid electrolyte membrane are stacked with a pair of positive and negative electrodes sandwiched between separators is divided into a plurality of capacitors in the storage container 3 to form capacitor cells 1 and 2, which are electrically connected in series. Connect to. Compared to the conventional method in which a plurality of storage containers are connected in series without being divided in the storage container, the dead space applied to the storage container can be reduced. That is, the volume for obtaining the same capacitance and the same withstand voltage can be kept small.

  The first and second capacitor cells 1 and 2 share one separator (11, 21), and the separator (11, 21) includes ions and ions between the first and second capacitor cells 1, 2. The boundary part 33 which interrupts | blocks conduction of an electron is provided. Since the first and second capacitor cells 1 and 2 share one separator (11, 21), the relative position between the first and second capacitor cells 1, 2 using the separator (11, 21). Can be fixed. Further, since the boundary portion 33 blocks the conduction of ions and electrons, no ion conduction or electron conduction occurs between the first and second capacitor cells 1 and 2 via the separators 1 and 2. In other words, by using a common separator for a plurality of capacitor cells, it is possible to separate the positive and negative electrodes and simultaneously separate adjacent capacitor cells 1 and 2.

  In addition, the first current collector 14 a included in the first capacitor cell 1 is connected to the first current collector 24 a included in the second capacitor cell 2. As a result, the current collectors of the first capacitor cell 1 and the second capacitor cell 2 can be connected in the storage container 3, and the first and second capacitor cells 1 and 2 are electrically connected in series. Can be connected. Since it is connected in series in the storage container 3, the external terminal for series connection and the wiring which connects external terminals are unnecessary.

In the first embodiment, the case where the first current collector 14a and the first current collector 24a are connected as shown in FIG. 1 is shown. By changing the pattern, the first current collector 14 a included in the first capacitor cell 1 may be connected to the second current collector 24 b included in the second capacitor cell 2. In addition, the first current collector 14a included in the first capacitor cell 1 and the first current collector 24a included in the second capacitor cell 2 are also similar to the second current collectors 14b and 24b. You may provide the terminal which takes out the electric potential out of the storage container 3. FIG. Details will be described with reference to the drawings in the second embodiment.
(Second Embodiment)
In FIG. 1, the case where the two capacitor cells 1 and 2 are connected in series by connecting the first current collectors 14a and 24a of the two capacitor cells 1 and 2 inside the storage container has been described. However, the present invention is not limited to this, and the first current collectors 14a and 24a may be connected outside the storage container. Therefore, in the second embodiment, the case where the terminals are connected to all the current collectors provided in the capacitor cell in the storage container, in other words, the capacitor cell stored in the storage container 3 is described. An electric double layer capacitor having twice as many terminals will be described.

  As shown in FIG. 5, in the electric double layer capacitor according to the second embodiment of the present invention, the first current collectors 14a and 24a of the two capacitor cells 1 and 2 are stored in a storage container as compared with FIG. 3 is not connected inside, but is connected to terminals 15a and 25a for taking out the potential out of the storage container 3 in the same manner as the second current collectors 14b and 24b. The other configuration is the same as that of the electric double layer capacitor of FIG.

  Although not shown in FIG. 5, the first and second capacitor cells 1 and 2 can be electrically connected in series by connecting the terminals 15a and 25a using wiring. The combination of terminals to be connected is not limited to this, and the terminals 15a and 15b included in the first capacitor cell 1 and the terminals 25a and 25b included in the second capacitor cell 2 may be connected in any combination. it can. Furthermore, the first and second capacitor cells 1 and 2 can be electrically connected in parallel by connecting the terminal 15a and the terminal 25a and connecting the terminal 15b and the terminal 25b.

  As shown in FIG. 6A, rectangular pads as terminals 15a and terminals 25a are formed on the outer surface of the cap 32 in FIG. 5, and as shown in FIG. On the outer surface of the cap 32, first current collectors 14a and 24a connected to the terminal 15a and the terminal 25a are formed.

  As described above, the electric double layer capacitor according to the second embodiment includes the first current collectors 14 a and 24 a and the second current collector 14 b included in the first and second capacitor cells 1 and 2. , 24b are provided with four terminals 15a, 15b, 25a, 25b for taking out the electric potential of 24b to the outside of the storage container 3. By connecting the terminals 15a and 25a using wiring, the first and second capacitor cells 1 and 2 can be electrically connected in series. Since a terminal to be connected outside the storage container can be arbitrarily selected, a series or parallel combination of the first and second capacitor cells 1 and 2 can be freely selected, and withstand voltage and electrostatic capacity can be selected. Design freedom is improved.

  As described above, the present invention has been described according to the first and second embodiments. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art. That is, it should be understood that the present invention includes various embodiments not described herein. Therefore, the present invention is limited only by the invention specifying matters according to the scope of claims reasonable from this disclosure.

It is sectional drawing which shows the structure of the electric double layer capacitor concerning the 1st Embodiment of this invention. FIG. 2A to FIG. 2F are perspective views showing main manufacturing steps in the method for manufacturing the first and second capacitor cells 1 and 2 of FIG. 3 (a) to 3 (g) are diagrams showing main manufacturing steps for storing the first and second capacitor cells 1 and 2 in a storage container, and FIG. 3 (a), FIG. 3E is a cross-sectional view, FIGS. 3B, 3D, and 3F are top views, and FIG. 3G is a plan view showing an inner surface of the cap 32. FIG. 4 (a) to 3 (h) are diagrams showing main manufacturing steps in the method of manufacturing the electric double layer capacitor according to the comparative example, and FIGS. 4 (a), (d), and (g) are cross-sectional views. 4B, 4E, and 4H are top views, and FIGS. 4C and 4F are plan views showing the inner surface of the cap 82. FIG. It is sectional drawing which shows the structure of the electrical double layer capacitor concerning the 2nd Embodiment of this invention. 6A is a plan view showing an outer surface of the cap 32 of FIG. 5, and FIG. 6B is a plan view showing an inner surface of the cap 32 of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st capacitor cell 2 2nd capacitor cell 3 Storage container 11, 21 Separator 12a, 22a 1st solid electrolyte membrane 12b, 22b 2nd solid electrolyte membrane 13a, 23a 1st electrode 13b, 23b 2nd Electrodes 14a, 24a First current collectors 14b, 24b Second current collectors 15a, 15b, 25a, 25b Terminal 31 Housing 32 Cap 41 Polarized electrode sheet 42 Solid electrolyte polymer 43a, 43b, 43c, 43d Laminate 61 Separator 63 Positive electrode 64, 74 Current collector 65, 75 Terminal 73 Negative electrode 81 Housing 82 Cap

Claims (5)

First and second capacitor cells;
A storage container for storing the first and second capacitor cells;
The first and second capacitor cells are respectively
A plate-shaped separator;
A first solid electrolyte membrane disposed on the surface of the separator;
A second solid electrolyte membrane disposed on the back surface of the separator;
A first electrode comprising an activated carbon electrode disposed on the first solid electrolyte membrane;
A second electrode comprising an activated carbon electrode disposed under the second solid electrolyte membrane;
A first current collector connected to the first electrode;
A second current collector connected to the second electrode,
The electric double layer capacitor, wherein the first and second capacitor cells are electrically connected in series.   The first and second capacitor cells share one separator, and the separator includes a boundary portion that blocks conduction of ions and electrons between the first and second capacitor cells. The electric double layer capacitor according to claim 1.   The apparatus further comprises four terminals for taking out each potential of the first current collector and the second current collector provided in the first and second capacitor cells to the outside of the storage container. 3. The electric double layer capacitor according to 1 or 2.   The first current collector included in the first capacitor cell is connected to the first current collector or the second current collector included in the second capacitor cell. Item 3. The electric double layer capacitor according to Item 1 or 2. A plate-shaped separator;
A first solid electrolyte membrane disposed on the surface of the separator;
A second solid electrolyte membrane disposed on the back surface of the separator;
A first electrode comprising an activated carbon electrode disposed on the first solid electrolyte membrane;
A second electrode comprising an activated carbon electrode disposed under the second solid electrolyte membrane;
A first current collector connected to the first electrode;
Producing first and second capacitor cells each comprising a second current collector connected to the second electrode;
Storing the first and second capacitor cells in a storage container;
And a step of electrically connecting the first and second capacitor cells in series.

Images