JP2006135119A - Square-shaped electrode cell and its manufacturing method, and electric double layer capacitor using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for alternately stacking electrode sheets and separators easily without bringing the electrode sheets into contact with each other due to a shift, in a multilayer structure of the electrode sheets and the separators in an electric double layer capacitor having such a structure that the electrode sheets and the separators are alternately stacked. <P>SOLUTION: In manufacturing the electric double layer capacitor, a square-shaped electrode cell is used which has such a structure that one electrode sheet is inserted into or sealed in a flat separator bag so that the lead of a current collector may be exposed to the outside. The electric double layer capacitor is manufactured by using a laminate made by stacking the plurality of square-shaped electrode cells. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a rectangular electrode cell used for an electric double layer capacitor, a manufacturing method thereof, and an electric double layer capacitor using the same.

  In recent years, an electric double layer capacitor in which a polarizable electrode such as activated carbon is impregnated with an electrolytic solution and electric energy is accumulated in an electric double layer at the interface has been put into practical use as a power storage medium. As a general configuration of an electric double layer capacitor, an electric sheet having a configuration in which a current collector such as a metal foil and a polarizable electrode such as activated carbon and separators are alternately laminated and impregnated with an electrolytic solution. A multilayer capacitor cell is formed, and the electric double layer capacitor cell is sealed in a container to form an electric double layer capacitor.

  In addition, an electric double layer capacitor is manufactured by forming a laminated body of an electrode sheet and a separator in a sandwich shape in a square electric double layer capacitor and in a roll shape in a cylindrical electric double layer capacitor. After connecting the lead portions of the (positive electrode body and negative electrode body) to each terminal and storing the laminate in a container, the electrolyte solution is injected from the opening of the container to impregnate the laminate with the electrolyte solution. Many methods for sealing containers with their tips exposed to the outside have been implemented.

  In such an electric double layer capacitor, a separator is used to insulate between each electrode sheet, but when the electrode sheet and the separator are laminated, or after lamination, when the laminated structure shifts, There was a possibility that the electrode sheets would contact each other. For this reason, conventionally, the lamination of the electrode sheet and the separator has been extremely carefully performed by human operation, and there are inconveniences that the work is complicated, in addition to inconvenience that it takes a long time, and inconvenience that the manufacturing cost increases. .

As an electric double layer capacitor in which measures for preventing contact between electrode sheets are taken, for example, when projecting in the stacking direction, the separator is separated so that the projection of each polarizable electrode includes the projection of the adjacent polarizable electrode. An electric double layer capacitor formed larger than a polar electrode has been developed (Japanese Patent Laid-Open No. 2002-289487). Thereby, the possibility that the electrode sheets come into contact with each other seems to be greatly reduced.
Japanese Patent Laid-Open No. 9-129509 JP 2002-289487 A

  However, also in the electric double layer capacitor described in JP-A-2002-289487, it is preferable not to make the separator unnecessarily large, and the center points of the electrode sheet (polarizable electrode) and the separator should coincide with each other. It is necessary to set the positional relationship, and in order to do so, careful work by human operation cannot be omitted, the inconvenience that the work is complicated, the inconvenience that it takes a long time, the manufacturing cost is high The inconvenience of becoming could not be solved.

  Accordingly, the problem to be solved by the present invention is that, in an electric double layer capacitor having a configuration in which electrode sheets and separators are alternately stacked, contact between the electrode sheets due to a shift in the stacked structure of the electrode sheets and separators occurs. It is another object of the present invention to provide means or the like that can easily and alternately laminate electrode sheets and separators.

  As a result of intensive studies to solve these problems, the present inventors have formed a separator, which has been conventionally used in a sheet form, into a flat bag, and is composed of a current collector and a polarizable electrode. A single electrode sheet is inserted or enclosed in a separator bag so that the lead portion of the current collector is exposed to the outside, and an electrode cell is manufactured. Electrode sheets and separators can be easily laminated alternately without causing contact, and in the production of separator bags, there is a possibility that it may bleed out after the process or after production and adversely affect the performance of the electric double layer capacitor. The inventors have found that the two stacked sheets can be easily pressure-bonded to each other without using various adhesives and can be easily formed into a bag shape, and the present invention has been achieved.

That is, the present invention is to insert or enclose one electrode sheet comprising a current collector and a polarizable electrode into a flat separator bag so that the lead portion of the current collector is exposed to the outside. This is a characteristic square electrode cell.
The present invention also provides an electrode sheet comprising a current collector and a polarizable electrode, one by one in a plurality of flat separator bags connected in a strip shape so that a lead portion of the current collector is exposed to the outside. It is a rectangular electrode cell characterized by being inserted or sealed.

In the present invention, a rectangular separator sheet is folded into a V shape and overlapped, and one electrode sheet composed of a current collector and a polarizable electrode is disposed so that the lead portion of the current collector and the bent portion face each other. After being set by being sandwiched between the separator sheets so as to be positioned, at least two sides adjacent to the bent portion of the separator sheets, the separator sheets are pressure-bonded to each other and formed into a bag shape, It is a manufacturing method of an electrode cell.
In the present invention, a strip-shaped separator sheet is folded in a V shape in the longitudinal direction and overlapped, and an electrode sheet composed of a current collector and a polarizable electrode is arranged so that the lead portion of the current collector and the bent portion face each other. A rectangular electrode cell characterized in that it is sandwiched and set on the separator sheet one by one so as to be positioned, and at least between the set electrode sheets, the separator sheets are pressure-bonded to each other and formed into a bag shape It is a manufacturing method.

Further, the present invention is characterized in that a plurality of the rectangular electrode cells each having the one electrode sheet are stacked and sealed in a container, and the stacked body is impregnated with an electrolytic solution. It is an electric double layer capacitor.
Further, the present invention provides a laminate by alternately bending the rectangular electrode cells having the plurality of electrode sheets one by one, sealing the laminate in a container, and impregnating the laminate with an electrolyte. It is also an electric double layer capacitor characterized by comprising the following structure.

  Since the rectangular electrode cell and the manufacturing method thereof according to the present invention have a configuration in which the electrode sheet is inserted or enclosed in a bag-shaped separator, there is no possibility that the electrode sheets come into contact with each other even if the laminated structure is displaced. In addition, since each electrode sheet is separated by two separators, the electrode sheets do not contact each other even if any one of the separators is broken. Moreover, the detachment | desorption of the powder by peeling of the material which comprises a polarizable electrode is prevented from spilling out of a bag with a bag-shaped separator, and it can also prevent the leakage current between both electrodes. Furthermore, the laminate of the electrode sheet and the separator can be manufactured easily, in a short time, and at a low manufacturing cost without taking time and effort. In addition, since the rectangular electrode cell of the present invention can be easily stacked, the conventional method of drying after stacking can be changed to the method of stacking after drying one by one. It can be sufficiently dried in a short time, and performances such as internal resistance, capacitance, withstand voltage, and life can be improved. As a result, an electric double layer capacitor capable of maintaining excellent performance for a long period can be efficiently manufactured at a low manufacturing cost.

The rectangular electrode cell, the manufacturing method thereof, and the electric double layer capacitor using the same of the present invention are applied to a rectangular electric double layer capacitor. Moreover, there is no restriction | limiting in particular in the use, For example, it applies suitably for the electrical double layer capacitor for motor vehicles.
Hereinafter, the rectangular electrode cell of the present invention, the manufacturing method thereof, and the electric double layer capacitor using the same will be described in detail with reference to FIGS. 1 to 8, but the present invention is not limited thereto. .

  FIG.1 and FIG.2 is a front block diagram which shows the example of the square electrode cell of the 1st form of this invention. 3 and 4 are front structural views showing an example of the rectangular electrode cell according to the second embodiment of the present invention. FIG. 5 is an enlarged plan view showing an example of a crimping pattern in a crimping portion of two separator sheets. FIG. 6 is a side view showing an example of a manufacturing process of an electrode cell in the method for manufacturing a rectangular electrode cell of the present invention. FIG. 7 is a perspective view showing an example of a manufacturing process of a plurality of rectangular electrode cells in the manufacturing method of the rectangular electrode cell of the present invention. FIG. 8 is a configuration diagram showing an example of the electric double layer capacitor of the present invention.

  As shown in FIGS. 1 and 2, the rectangular electrode cell according to the first embodiment of the present invention has a single electrode sheet 1 made of a current collector and a polarizable electrode, and a lead portion 2 of the current collector is externally provided. It is inserted into or sealed in a flat separator bag 3 so as to be exposed to the surface. Further, as shown in FIGS. 3 and 4, the rectangular electrode cell according to the second embodiment of the present invention has an electrode sheet 1 composed of a current collector and a polarizable electrode, and a lead portion 2 of the current collector is placed outside. Each piece is inserted or sealed into a plurality of flat separator bags 3 connected in a strip shape so as to be exposed. In addition, the square electrode cell as shown in FIGS. 3 and 4 may be configured by connecting a plurality of any of the square electrode cells shown in FIGS. 2 (1) to (4). Moreover, 4 in a figure shows the bending part of a separator sheet, 5 (shaded part) shows the crimping | compression-bonding part of a separator sheet.

  As a material for the separator bag, cellulose or synthetic resin is usually used. Moreover, as a structure of a separator bag, the surface of the polarizable electrode of an electrode sheet should just be the state covered with the separator, and does not necessarily need to be sealed by a separator bag. The separator bag may be sandwiched so that the electrode sheet does not move. For example, partial pressure bonding as shown in FIG. 2 (2) is possible. In addition, the separator bag may be formed into a bag shape as shown in FIGS. 2 (2) and (3) by using two separator sheets and crimping each other on at least a part of the outer periphery of the electrode sheet. It is good also as a bag shape as shown to FIG. 2 (1) (4) by bending the separator sheet of 1 sheet and crimping | bonding at least one part of other periphery.

In the rectangular electrode cell of the present invention, as described above, the separator sheet is formed into a bag shape by pressure bonding, but the use of the adhesive oozes out part of the adhesive component after the post-process or manufacturing, This is not preferable because it may adversely affect the performance of the electric double layer capacitor. The pressure bonding can be performed, for example, by superposing separator sheets and then pressing a part of the sheets into a geometrical figure or pattern as shown in FIG. In addition, the press part in FIG. 5 is a straight line, a curve, a point, or a square filling part.
When the rectangular electrode cell of the present invention is manufactured, it may be manufactured by inserting or enclosing an electrode sheet into a separator bag manufactured in advance or a plurality of separator bags connected in a strip shape. Alternatively, it may be produced by the following method for producing a rectangular electrode cell of the present invention.

  The manufacturing method of the rectangular electrode cell according to the first aspect of the present invention includes a rectangular separator sheet folded in a V shape and superposed, and a single electrode sheet comprising a current collector and a polarizable electrode is formed on the current collector. After sandwiching and setting the separator sheet so that the lead portion and the bent portion are opposed to each other, at least two sides adjacent to the bent portion of the separator sheet are pressure-bonded to each other, and FIG. This is a manufacturing method for forming a rectangular electrode cell as shown in (1).

  In addition, in the method for manufacturing a rectangular electrode cell according to the second aspect of the present invention, a strip-shaped separator sheet is folded in a longitudinal shape in a V shape and overlapped, and an electrode sheet comprising a current collector and a polarizable electrode is collected. The sheet is sandwiched and set on the separator sheet one by one so that the lead part and the bent part of the body face each other, and the separator sheet is crimped between at least each of the set electrode sheets to form a bag shape. Thus, a manufacturing method for forming a rectangular electrode cell as shown in FIG. 3 or FIG. The separator sheet crimping portion between the electrode sheets may be one as shown in FIG. 3, but two places are crimped as shown in FIG. It can also be used as an electrode cell.

  In the method for manufacturing a rectangular electrode cell according to the present invention, when the electrode sheet is sandwiched and set in a separator sheet bent into a V shape, the positional relationship between the electrode sheet and the side surface of the separator sheet is as shown in FIG. It will be a thing. The V-shaped separator sheets are then closed at the top and bonded together by pressure bonding. In addition, when manufacturing a square electrode cell with the manufacturing method of a 2nd form, a manufacturing apparatus as shown, for example in FIG. 7 can be used.

  The electric double layer capacitor of the present invention uses the above-mentioned laminated body of rectangular electrode cells. The laminated body is a rectangular electrode cell as shown in FIG. 1 or FIG. 2 or a rectangular electrode cell as shown in FIG. 3 or FIG. It can be manufactured by laminating the lead portions alternately. Moreover, the lead electrode part which becomes a positive electrode body, and the lead part which becomes a negative electrode body are laminated | stacked alternately by folding up and overlapping the rectangular electrode cell as shown in FIG. 3, FIG. Therefore, it can manufacture easily by doing in this way.

  In an electric double layer capacitor, an organic electrolytic solution capable of obtaining a large energy density is generally used as an electrolytic solution. However, since the withstand voltage decreases due to a small amount of moisture absorption, the electrolytic solution tends to deteriorate. The laminated body is sufficiently dried before pouring the liquid, and the subsequent operation is performed in an inert gas atmosphere until the container is sealed. Production of a laminate of an electrode sheet and a separator requires careful work by human operation, and the work is complicated. Therefore, a method of drying after lamination has been conventionally performed. However, in the present invention, it is easy to produce a laminate, and a method of laminating after drying one by one, or a rectangular electrode cell as shown in FIGS. 3 and 4, with an appropriate gap. Since it can be made into a method of drying in a folded state and then adhering and laminating, the electrode cell can be dried sufficiently in a short time, and performance such as internal resistance, capacitance, withstand voltage, life, etc. Can be improved.

In the present invention, after the positive electrode body lead portion and the negative electrode body lead portion of the electrode sheet are laminated so that they can be connected to the positive electrode terminal and the negative electrode terminal of the electrode terminal member, respectively, So that the moisture permeability is suppressed and stored in a flat container made of plastic or metal foil.
Next, the electrolytic solution is injected into the container to impregnate the electric double layer capacitor cell with the electrolytic solution, and the inside of the container is decompressed to remove the gas adsorbed on the polarizable electrode and the separator. By doing in this way, a laminated body can be efficiently impregnated with electrolyte solution. In addition, if necessary, in order to electrolyze and remove moisture and functional groups contained in the polarizable electrode between the injection of the electrolytic solution and the sealing of the container, the electrode terminal of the electrode terminal member is energized and electrolyzed. Purification can also be performed.
Thereafter, the container is sealed by, for example, pressing two heated heat seal bars in a state where the flat container made of plastic is sandwiched, and the electric two of the present invention having the configuration as shown in FIG. A multilayer capacitor is obtained. In the present invention, at least from injection of the electrolytic solution to sealing of the container is performed under reduced pressure or in an inert gas atmosphere.

  EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited by these.

(Manufacture of square electrode cell)
One rectangular cellulose separator sheet (thickness: 35 μm) is folded in a V shape and overlapped, and the outer periphery of two sides adjacent to the bent part is 1.5 mm wide as shown in FIG. 5 (1). In order to be crimped, they were crimped to each other with a crimping machine and formed into a square bag shape having a side of 105 mm. One electrode sheet (100 mm square on each side (excluding the lead) except for a polarizable electrode made of a mixture of activated carbon, carbon black, binder, etc.) and a current collector made of aluminum foil. )) Was inserted so that the lead portion (length 30 mm, width 20 mm) was exposed to the outside, and a square electrode cell (thickness: about 300 μm) as shown in FIG. 1 was manufactured.

(Production of electric double layer capacitor)
The 30 rectangular electrode cells thus produced were dried under reduced pressure at 160 ° C. for 12 hours using a vacuum dryer. In addition, a square flat container having an opening on one side and having an aluminum foil as a base and a side of 150 mm, and an electrode terminal were dried under reduced pressure at 80 ° C. for 15 hours using a vacuum dryer. After these were cooled to room temperature under a nitrogen atmosphere, 30 rectangular electrode cells were laminated so that the lead portions were alternately positive and negative electrodes, and the positive electrode lead portion and the negative electrode lead portion were Each was bonded to the electrode terminal by welding, and the laminate was inserted into a flat container so that the electrode terminal was on the opening side.

Next, 90 ml of an electrolytic solution in which an ammonium salt or the like was dispersed in a propylene carbonate solvent was injected from the opening of a flat container. After completing the injection of the electrolytic solution, the laminate was decompressed by a vacuum pump for 30 minutes, and the laminate was decompressed. During this period, the electrode terminal was energized to perform electrolytic purification. Thereafter, the opening of the container was heat sealed at 150 ° C., and the flat container was sealed to obtain an electric double layer capacitor.
As a result of measuring the capacitance and the internal resistance at 25 ° C. and 2.7 V charge of this electric double layer capacitor, it was 952F and 3.1 mΩ, respectively, and it was confirmed that the performance was excellent. In addition, it was confirmed that the self-discharge rate was as low as 3 to 4% and the leakage current was small. Next, the electric double layer capacitor was charged to 2.7 V with a constant current of 1.5 A, then held for 30 minutes, and a cycle of discharging to 0 V with a constant current of 1.5 A was repeated at room temperature. The change in capacitance was measured. Table 1 shows the capacitance with respect to the charge / discharge cycle.

(Manufacture of square electrode cell)
A band-shaped cellulose separator sheet (thickness: 35 μm) having a width of 105 mm is folded in a V shape in the longitudinal direction and overlapped, and at a position spaced apart from each other by 105 mm in the longitudinal direction, the width is 3.0 mm. In order to be crimped as in (2), they were crimped together by a crimping device and formed into a square bag shape with a side of 105 mm. An electrode sheet (100 mm square (excluding the lead)) with a polarizable electrode made of a mixture of activated carbon, carbon black, binder, etc. and a current collector made of aluminum foil bonded to this separator bag The lead portions (length 30 mm, width 20 mm) were inserted one by one so as to be exposed to the outside, and a strip-shaped square electrode cell (thickness: about 300 μm) as shown in FIG.

(Production of electric double layer capacitor)
The 30 rectangular electrode cells connected in a strip shape thus produced were dried under reduced pressure at 160 ° C. for 12 hours using a vacuum dryer. In addition, a square flat container having an opening on one side and having an aluminum foil as a base and a side of 150 mm, and an electrode terminal were dried under reduced pressure at 80 ° C. for 15 hours using a vacuum dryer. After these are cooled to room temperature in a nitrogen atmosphere, the connected rectangular electrode cells are folded back at the crimping portion and laminated so that the lead portions alternately become the positive electrode and the negative electrode, and the lead portion and the negative electrode of the positive electrode body The lead portions of the body were bonded to the electrode terminals by welding, and the laminate was inserted into a flat container so that the electrode terminals were on the opening side.

Subsequently, 90 ml of an electrolytic solution in which an ammonium salt or the like was dispersed in a propylene carbonate solvent was injected from the opening of the flat container. After completing the injection of the electrolytic solution, the laminate was decompressed by a vacuum pump for 30 minutes, and the laminate was decompressed. During this period, the electrode terminal was energized to perform electrolytic purification. Thereafter, the opening of the container was heat sealed at 150 ° C., and the flat container was sealed to obtain an electric double layer capacitor.
As a result of measuring the capacitance and the internal resistance at 25 ° C. and 2.7 V charge of this electric double layer capacitor, it was 961F and 3.2 mΩ, respectively, and it was confirmed that the performance was excellent. In addition, it was confirmed that the self-discharge rate was as low as 3 to 4% and the leakage current was small. Table 1 shows the results of measuring the capacitance with respect to the charge / discharge cycle in the same manner as in Example 1.

[Comparative Example 1]
(Production of laminate)
30 electrode sheets (100 mm square (excluding lead)) with a polarizable electrode made of a mixture of activated carbon, carbon black, binder, etc. and a current collector made of aluminum foil, and made of cellulose 30 separator sheets (105 mm square on each side, 70 μm in thickness) are laminated so that they alternate, and the lead part of the positive electrode body and the lead part of the negative electrode body are bonded to the electrode terminals by welding. To make a laminate.

(Production of electric double layer capacitor)
The laminate thus produced was dried under reduced pressure at 160 ° C. for 12 hours using a vacuum dryer. In addition, a square flat container having an opening on one side and having an aluminum foil as a base and a side of 150 mm, and an electrode terminal were dried under reduced pressure at 80 ° C. for 15 hours using a vacuum dryer. After these were cooled to room temperature under a nitrogen atmosphere, the laminate was inserted into a flat container so that the electrode terminals were on the opening side.

Subsequently, 90 ml of an electrolytic solution in which an ammonium salt or the like was dispersed in a propylene carbonate solvent was injected from the opening of the flat container. After completing the injection of the electrolytic solution, the laminate was decompressed by a vacuum pump for 30 minutes, and the laminate was decompressed. During this period, the electrode terminal was energized to perform electrolytic purification. Thereafter, the opening of the container was heat sealed at 150 ° C., and the flat container was sealed to obtain an electric double layer capacitor.
As a result of measuring the capacitance and the internal resistance at 25 ° C. and 2.7 V charge of this electric double layer capacitor, they were 940 F and 3.2 mΩ, respectively. Table 1 shows the results of measuring the capacitance with respect to the charge / discharge cycle in the same manner as in Example 1.

[Comparative Example 2]
(Production of laminate)
30 electrode sheets (100 mm square (excluding lead)) with a polarizable electrode made of a mixture of activated carbon, carbon black, binder, etc. and a current collector made of aluminum foil, and made of cellulose 30 separator sheets (a square having a side of 105 mm and a thickness of 70 μm) were dried under reduced pressure at 160 ° C. for 12 hours using a vacuum dryer. Although these were cooled to room temperature in a nitrogen atmosphere, electrode sheets and separator sheets were alternately laminated, and the lead portion of the positive electrode body and the lead portion of the negative electrode body were tried to be bonded to the electrode terminals by welding, respectively. It was difficult to laminate the electrode sheet and the separator without causing a shift in the laminated structure.

  As described above, the rectangular electrode cell according to the embodiment of the present invention can easily stack the electrode sheets and the separators alternately without causing contact between the electrode sheets due to the shift of the stacked structure of the electrode sheets and the separators. it can. Therefore, lamination can be performed after drying, and since the electrode cell can be sufficiently dried in a short time, it has been confirmed that an electric double layer capacitor having excellent electrostatic capacity and internal resistance and having a long life can be obtained.

Front view showing an example of a rectangular electrode cell according to the first embodiment of the present invention. Front configuration diagram showing an example of a square electrode cell of the first embodiment other than FIG. 1 of the present invention Front configuration diagram showing an example of a square electrode cell according to a second embodiment of the present invention Front configuration diagram showing an example of a square electrode cell of a second embodiment other than FIG. 3 of the present invention An enlarged plan view showing an example of a crimping pattern in a crimping portion of two separator sheets The side view which shows the example of the manufacturing process of an electrode cell in the manufacturing method of the square electrode cell of this invention The perspective view which shows the example of the manufacturing process of several square electrode cell in the manufacturing method of the square electrode cell of this invention. Configuration diagram showing an example of an electric double layer capacitor of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electrode sheet 2 Lead part 3 Separator bag 4 Bending part 5 Crimp part 6 Separator sheet 7 Roll 8 Electrode sheet supply part 9 Laminated body 10 Positive electrode terminal 11 Negative electrode terminal 12 Container

Claims (11)

  A rectangular shape characterized in that one electrode sheet comprising a current collector and a polarizable electrode is inserted or enclosed in a flat separator bag so that a lead portion of the current collector is exposed to the outside. Electrode cell.   An electrode sheet composed of a current collector and a polarizable electrode is inserted or sealed one by one in a plurality of flat separator bags connected in a strip shape so that the lead portion of the current collector is exposed to the outside. A rectangular electrode cell.   The square electrode cell according to claim 1 or 2, wherein the separator bag is made of cellulose or a synthetic resin.   3. The square electrode cell according to claim 1, wherein the separator bag is formed by bonding two separator sheets into a bag shape by pressure bonding to each other at least at a part of the outer periphery of the electrode sheet.   2. The corner according to claim 1, wherein the separator bag is formed by folding a rectangular separator sheet into a V shape and stacking them, and at least two sides adjacent to the bent portion are pressure-bonded to each other to form a bag shape. Type electrode cell.   A plurality of separator bags are formed by folding strip-shaped separator sheets into a V shape in the longitudinal direction and overlapping them, and at the positions separated from each other in the longitudinal direction at intervals of at least the width of the electrode sheet. The rectangular electrode cell according to claim 2, which is formed into a shape.   A rectangular separator sheet is folded into a V shape and stacked, and one electrode sheet made of a current collector and a polarizable electrode is placed so that the lead portion and the bent portion of the current collector face each other. A method of manufacturing a rectangular electrode cell, comprising: sandwiching and setting a separator sheet, and then pressing the separator sheet together at least on two sides adjacent to the bent portion of the separator sheet to form a bag shape.   A strip-shaped separator sheet is folded in a V shape in the longitudinal direction and overlapped, and an electrode sheet composed of a current collector and a polarizable electrode is placed so that the lead portion of the current collector and the bent portion are in a position facing each other. A method for producing a rectangular electrode cell, wherein the separator sheet is sandwiched and set one by one, and the separator sheets are pressure-bonded to each other at least between the set electrode sheets to form a bag.   The manufacturing method of the square-shaped electrode cell of Claim 8 which cuts a separator sheet between each electrode sheet | seat after crimping | separating a separator sheet mutually and shape | molding in a bag shape.   An electric double layer capacitor comprising a structure in which a plurality of the rectangular electrode cells according to claim 1 are laminated and sealed in a container, and the laminate is impregnated with an electrolytic solution. The rectangular electrode cell according to claim 2 is alternately folded one by one to form a laminated body, and the laminated body is sealed in a container, and the laminated body is impregnated with an electrolytic solution. An electric double layer capacitor characterized.

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