JP2006303269A - Electric double layer capacitor and electric double layer capacitor module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an electric double layer capacitor in which connection of a positive electrode current collecting plate and a negative electrode current collecting plate is facilitated and electric resistance between the current collecting plates can be reduced. <P>SOLUTION: A positive electrode current collecting electrode 5aa is exposed from a positive electrode current collecting hole 20a of an outer case 1, and a positive electrode seal layer 4a having a positive electrode seal hole 21a smaller than the positive electrode current collecting hole 20a is stuck tightly to the positive electrode current collecting electrode 5aa at that part by a ring-shaped melting portion 4a3. Projecting central portion of a positive electrode current collecting plate 3a is inserted into the outer case 1 through the positive electrode seal hole 21a and the positive electrode current collecting hole 20a from the outside of the left side face of the outer case 1. Central portion of the positive electrode current collecting plate 3a is stuck tightly to the positive electrode current collecting electrode 5aa by a joint 3a1. The positive electrode seal layer 4a is stuck tightly to the outer case 1 around the positive electrode current collecting hole 20a by ring-shaped melting portions 4a1 and 4a2 and stuck tightly to the periphery of the positive electrode current collecting plate 3a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a structure of an electric double layer capacitor and a structure of an electric double layer capacitor module in which a plurality of electric double layer capacitors are stacked.

  As disclosed in Patent Document 1 below, an electric double layer capacitor is provided with polarizable electrodes (positive electrode and negative electrode) facing each other across a separator, and is formed on the surface of the polarizable electrode in an electrolyte solution. It utilizes the double layer capacitance. An electric double layer capacitor has a much larger capacitance than a general capacitor such as an aluminum capacitor, and unlike a secondary battery, it does not involve a chemical reaction during charging and discharging. There is an advantage that it can be discharged and charge / discharge efficiency is good. In addition, the battery can be charged / discharged 100,000 times or more, has a feature that the lifetime is 10 years or more and the reliability is high.

  Electric double layer capacitors are used for back-up of electronic devices, power storage for home appliances and photocopiers, power sources for start-up when automobiles are idle, power sources for hybrid vehicles, peak shaving and leveling of wind power and solar power generation A wide range of applications has been started, including power storage applications, and it is expected to be a key device that helps save energy and reduce carbon dioxide.

  The structure of a conventional electric double layer capacitor is shown, for example, in FIG. A plurality of electrode structures having a positive electrode and a negative electrode facing each other with a separator interposed therebetween are stacked. The positive terminals of each positive electrode are brought into close contact with each other by welding, ultrasonic bonding, or the like, and connected to the positive electrode current collector plate. Similarly, the negative electrode terminals of each negative electrode are brought into close contact by welding, ultrasonic bonding, or the like, and connected to the negative electrode current collector plate. The cell portion thus configured is housed in an exterior case and impregnated with an electrolytic solution (such as an electrolyte dissolved in a solution or an ionic liquid).

  FIG. 6 of Patent Document 2 below shows a structure in which a cell portion is housed in a bag-shaped outer case, and a positive current collector and a negative current collector protrude outside the outer case.

  The structure of a conventional electric double layer capacitor module is shown in FIG. 7 of Patent Document 1 below and FIG. 10 of Patent Document 2 below, for example. A plurality of electric double layer capacitors are housed in the case. The current collecting plates of each electric double layer capacitor are connected by wiring (inter-terminal conductor). When the positive electrode current collector plate and the negative electrode current collector plate are alternately connected, a plurality of electric double layer capacitors are connected in series, so that the voltage can be increased in proportion to the number of electric double layer capacitors.

Japanese Patent No. 2987162 JP 2004-47971 A

  According to the conventional electric double layer capacitor and electric double layer capacitor module, the current collector plates must be connected by wiring, and the wiring length is long. Cannot be ignored. Therefore, there are problems such as instantaneous charge / discharge efficiency being reduced and heat generation being increased.

  Further, in FIG. 6 of Patent Document 2, the positive electrode current collector plate and the negative electrode current collector plate are drawn out to the outside of the bag-shaped outer case. There is also a problem that moisture enters the outer case from the drawer portion.

  The present invention has been made to solve the above-described problems, and facilitates the connection between the positive electrode current collector plate and the negative electrode current collector plate when stacking the electric double layer capacitors. An object of the present invention is to obtain an electric double layer capacitor capable of reducing the electric resistance between the electric plates. It is another object of the present invention to obtain an electric double layer capacitor in which the sealability of the portion where the positive electrode current collector plate and the negative electrode current collector plate are drawn from the outer case is enhanced.

  An electric double layer capacitor according to a first aspect of the present invention is a cell part having a positive electrode and a negative electrode opposed to each other with a separator interposed therebetween, and a positive electrode current collector electrode constituting the first main surface of the cell part and connected to the positive electrode And an outer case that constitutes the second main surface of the cell portion that is in a front-back relationship with the first main surface of the cell portion, is connected to the negative electrode, and the cell portion is housed in the outer case And a positive current collecting hole is formed in the first main surface of the outer case facing the first main surface of the cell portion, and the second of the outer case facing the second main surface of the cell portion. An exterior case having a negative electrode current collecting hole formed on the main surface, a positive electrode sealing layer having a positive electrode seal hole corresponding to the positive electrode current collecting hole, and a negative electrode seal hole corresponding to the negative electrode current collecting hole were formed. The negative seal layer and the positive electrode from the outside of the first main surface of the outer case. A positive current collector plate having a central portion inserted into the outer case through a seal hole and the positive current collecting hole, the central portion being in close contact with the positive current collecting electrode; and the first of the outer case 2. A negative electrode current collector plate having a central part inserted into the outer case from the outside of the main surface through the negative electrode sealing hole and the negative electrode current collecting hole, the central part being in close contact with the negative electrode current collecting electrode With.

  An electric double layer capacitor module according to a second invention includes the first and second electric double layer capacitors according to any one of claims 1 to 5, and the first electric double layer capacitor includes the first electric double layer capacitor. The first and second electric double layer capacitors are arranged so that the positive electrode current collector plate and the negative electrode current collector plate included in the second electric double layer capacitor are in surface contact with each other.

  According to the electric double layer capacitor according to the first invention, when the electric double layer capacitor is laminated, the positive electrode current collecting plate and the negative electrode current collecting plate can be easily connected and the electric resistance between the current collecting plates is reduced. can do.

  According to the electric double layer capacitor module of the second invention, the positive electrode current collector plate and the negative electrode current collector plate can be easily connected and the electrical resistance between the current collector plates can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each figure, the element which attached | subjected the same code | symbol shall show the same or an equivalent element.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a structure of electric double layer capacitor 9 according to Embodiment 1 of the present invention. 2 and 3 are a cross-sectional view and a front view, respectively, showing an enlarged structure of a portion where the positive electrode current collector plate 3a is formed in the structure shown in FIG. Referring to FIG. 1, a cell portion is configured by laminating a plurality of sets of positive electrodes 6 a and negative electrodes 6 b facing each other with a porous separator 7 interposed therebetween. As the positive electrode 6a and the negative electrode 6b, a layer having a thickness of several hundreds μm is used in which activated carbon or nanogate carbon having a diameter of about 10 μm is fixed using a fluorine-based resin such as PTFE (polytetrafluoroethylene) as a binder. It is done.

  The positive electrode 6a is formed on the positive electrode collecting electrode 5a, and the negative electrode 6b is formed on the negative electrode collecting electrode 5b. A metal foil (aluminum foil, copper foil, etc.) is used as the positive electrode collecting electrode 5a, and the positive electrode 6a is formed on one side or both sides of the positive electrode collecting electrode 5a. Similarly, a metal foil is used also as the negative electrode current collecting electrode 5b, and the negative electrode 6b is formed on one or both surfaces of the negative electrode current collecting electrode 5b.

  The cell part is accommodated in the outer case 1. As the outer case 1, a laminate film in which a resin such as polyethylene is bonded to the surface of a metal foil (aluminum foil, copper foil, etc.) is used. The outer case 1 is provided with a discharge valve 2. The discharge valve 2 is provided with a small through hole, and this through hole is normally closed by the valve. When the internal pressure of the outer case 1 increases, the valve opens and the through hole is opened. The gas in the outer case 1 is released to the outside.

  Separator 7 includes cellulose-based materials such as natural pulp, natural cellulose, solvent-spun cellulose, non-woven fabrics containing glass fibers and non-fibrillated organic fibers, fibrillated forms such as polytetrafluoroethylene (PTFE), or porous materials. A film is used. The separator 7 has a thickness of about 20 μm to 50 μm.

The electrolyte solution impregnated in the separator 7 is, for example, a combination of a cation and an anion, and the cation is quaternary ammonium, 1,3-dialkylimidazolium, or 1,2,3-trialkylimidazolium, and the anion is BF _{4. ^{-, PF 6 -, ClO 4}} -, or CF ₃ SO ₃ ^- of or salts, 1-ethyl-3-methylimidazolium (EMI), 1,2-dimethyl-3-AlCl ₄ propyl imidazolium (DMPI) ^- or BF ₄ ^- and salts, etc. are used, such as, one selected propylene carbonate as a solvent, ethylene carbonate, dimethyl carbonate, diethyl carbonate, dimethoxymethane, diethoxyethane, .gamma.-butyrolactone, acetonitrile, propionitrile Alternatively, a mixed solvent of two or more of these is used.

  FIG. 4 is a side view schematically showing the positional relationship between the positive electrode 6 a, the negative electrode 6 b, and the separator 7. The positive electrode 6a formed on the positive electrode current collecting electrode 5a and the negative electrode 6b formed on the negative electrode current collecting electrode 5b are alternately sandwiched between the folded separators 7, thereby forming a cell part.

  In FIG. 4, the positive electrode current collecting electrode 5aa at the left end is formed with the positive electrode 6a only on one side. Similarly, a negative electrode 6b is formed only on one side of the rightmost negative electrode collecting electrode 5bb in FIG. The positive electrode 6a or the negative electrode 6b is formed on both surfaces of the other positive electrode collector electrode 5a or the negative electrode collector electrode 5b.

  As shown in FIG. 1, the positive electrode collecting electrodes 5 a are joined to each other by ultrasonic welding on the upper surface or side surface thereof. Similarly, each negative electrode current collection electrode 5b is joined by ultrasonic welding on the upper surface or side surface thereof. Further, in FIG. 1, the leftmost positive electrode collecting electrode 5aa forms the left side which is the first main surface of the cell portion, and in FIG. 1, the rightmost negative electrode collecting electrode 5bb is the second main surface of the cell portion. This constitutes the right side. Therefore, by collecting current from the positive electrode collecting electrode 5aa, all the positive electrodes 6a are collected in parallel, and by collecting current from the negative electrode collecting electrode 5bb, all negative electrodes 6b are collected in parallel. Become.

  With reference to FIGS. 1 to 3, a positive electrode current collecting hole 20 a penetrating through the outer case 1 is formed on the left side surface which is the first main surface of the outer case 1. The positive electrode current collecting hole 20a exposes the positive electrode current collecting electrode 5aa, and the positive electrode current collecting electrode 5aa in this portion is formed with a positive electrode seal hole 21a that is slightly smaller than the positive electrode current collecting hole 20a. 4a is brought into close contact with the ring-shaped fused portion 4a3. Further, the projecting central portion of the positive electrode current collector plate 3a is inserted into the outer case 1 from the outside of the left side surface of the outer case 1 through the positive electrode sealing hole 21a and the positive electrode current collecting hole 20a. The central portion of the positive electrode current collector plate 3a is in close contact with the portion of the positive electrode current collector electrode 5aa exposed from the positive electrode current collector hole 20a by the joint 3a1. The positive electrode sealing layer 4a is in close contact with the outer case 1 around the positive electrode current collecting hole 20a by the ring-shaped fused portions 4a1 and 4a2, and is in close contact with the peripheral edge portion of the positive electrode current collecting plate 3a.

  2 and 3, only the current collecting structure on the positive electrode side is shown, but the negative electrode side also has a similar current collecting structure. With reference to FIG. 1, a negative electrode current collecting hole 20 b penetrating through the outer case 1 is formed on the right side surface which is the second main surface of the outer case 1. The negative electrode current collecting hole 20b exposes the negative electrode current collecting electrode 5bb, and the negative electrode current collecting electrode 5bb in this portion is formed with a negative electrode seal hole 21b that is slightly smaller than the negative electrode current collecting hole 20b. 4b is closely attached by a ring-shaped fusion part (corresponding to the fusion part 4a3 in FIG. 3). Further, the projecting central portion of the negative electrode current collector plate 3b is inserted into the outer case 1 from the outside of the right side surface of the outer case 1 through the negative electrode sealing hole 21b and the negative electrode current collecting hole 20b. The central portion of the negative electrode current collector plate 3b is in close contact with the portion of the negative electrode current collector electrode 5bb exposed from the negative electrode current collector hole 20b by a bonding portion (corresponding to the bonding portion 3a1 in FIG. 3). The negative electrode seal layer 4b is in close contact with the outer case 1 around the negative electrode current collection hole 20b by a double ring-shaped fusion part (corresponding to the fusion parts 4a1 and 4a2 in FIG. 3). It is closely attached to the peripheral edge of 3b.

  5 to 8 are cross-sectional views showing the assembly procedure of the electric double layer capacitor 9 according to the first embodiment in the order of steps corresponding to FIG. Here, only the assembly of the positive electrode current collector structure is described, and the negative electrode current collector structure is the same as the positive electrode current collector structure, and thus the description thereof is omitted.

  With reference to FIG. 5, first, the outer case 1 and the positive electrode sealing layer are arranged such that the center of the positive electrode current collecting hole 20a, the center of the positive electrode sealing hole 21a, and the center of the central part of the positive electrode current collecting plate 3a overlap each other. 4a and the positive electrode current collector plate 3a are aligned. The positive electrode sealing layer 4a is for ensuring electrical insulation and gas sealing properties, and a thermoplastic resin such as a polyethylene film having a thickness of about 0.2 mm is used as the positive electrode sealing layer 4a. As the positive electrode current collector plate 3a, a metal foil (aluminum foil, copper foil, etc.) having a thickness of 1 mm or less is used.

  With reference to FIG. 6, next, a lever having a double ring-shaped heating part that is slightly larger than the positive electrode current collecting hole 20a is prepared, and the heating part is in contact with the positive electrode current collecting plate 3a. Heat to 150 ° C or higher with an electric heater. As a result, a fusion part 4a1 having a width of about 10 mm and a fusion part 4a2 having a width of about 5 mm are formed in a double ring shape, and the outer case 1 and the positive electrode seal layer are formed by these fusion parts 4a1 and 4a2. 4a and the positive electrode current collector plate 3a are in close contact with each other.

  Next, referring to FIG. 7, the cell portion prepared in advance is stored in the outer case 1 from the upper opening surface of the bag-shaped outer case 1.

  Referring to FIG. 8, next, the central portion of positive electrode current collector plate 3a and positive electrode current collector electrode 5aa are joined by ultrasonic welding. Thereby, the joining part 3a1 is formed, and the positive electrode current collector plate 3a and the positive electrode current collector electrode 5aa are in close contact with each other.

  Referring to FIG. 2, next, a lever having a ring-shaped heating portion that is slightly larger than the positive electrode seal hole 21a is prepared, and the heating portion is brought into contact with the positive electrode current collector plate 3a. Heat to 150 ° C or higher. As a result, a fused portion 4a3 having a width of about 3 mm is formed in a ring shape. By this fused portion 4a3, the positive electrode sealing layer 4a and the positive electrode current collecting electrode 5aa exposed from the positive electrode current collecting hole 20a Are closely attached to each other.

  Then, after evacuating from the upper opening surface of the outer case 1, an electrolytic solution is injected into the outer case 1. Finally, the electric double layer capacitor 9 according to the first embodiment is completed by sealing the upper opening surface of the outer case 1 by thermocompression bonding.

  In the electric double layer capacitor 9 assembled in this way, as shown in FIGS. 2 and 3, the positive electrode current collector plate 3a and the outer case 1 are triple-sealed by the fused portions 4a1 to 4a3. Yes. Accordingly, it is possible to effectively prevent the liquid or gasified electrolyte from leaking from the positive electrode current collecting hole 20a to the outside of the outer case 1, and external moisture enters the outer case 1 from the positive electrode current collecting hole 20a. This can be effectively prevented. The fused portions 4a1 and 4a2 also play a role of physically fixing the positive electrode current collector plate 3a together with the joint portion 3a1.

  In the above description, an example in which the positive electrode current collector plate 3a and the outer case 1 are sealed by fusion bonding of a polyethylene film has been described. However, sealing may be performed using a polypropylene film, various adhesives, or the like. In addition, since an electric double layer capacitor module is configured by laminating a plurality of electric double layer capacitors 9 as will be described later, silicone rubber is used to absorb the pressure applied to the positive electrode current collector plate 3a and the negative electrode current collector plate 3b. You may seal using elastic materials, such as.

  Moreover, in the above description, as shown in FIG. 6, the example in which the peripheral portion of the positive electrode current collector plate 3 a and the outer case 1 are brought into close contact with the double ring-shaped fused portions 4 a 1 and 4 a 2 is described. You may make it contact | adhere by the single or triple or more fusion | fusion part. However, in order to ensure sufficient gas sealing properties, it is desirable to form a double or more fused part. Alternatively, the entire periphery of the positive electrode current collector plate 3 a may be brought into close contact with the outer case 1.

  FIG. 9 is a cross-sectional view showing the structure of the electric double layer capacitor module according to the first embodiment. A plurality of the above-described electric double layer capacitors 9 are arranged in parallel in the resin module container 14. The electric current collector plate 3a and the negative electrode current collector plate 3b of the electric double layer capacitor 9 adjacent to each other are in surface contact, so that the plurality of electric double layer capacitors 9 are electrically connected in series. The adjustment circuit 11 is for adjusting the initial value at the time of charging / discharging, and is connected between the positive electrode current collecting plate 3a and the negative electrode current collecting plate 3b of each electric double layer capacitor 9.

  The positive electrode current collecting plate 3 a of the leftmost electric double layer capacitor 9 is in surface contact with the positive electrode current terminal plate 10 a, and the positive electrode current terminal plate 10 a is drawn out of the module container 14. Similarly, the negative electrode current collector plate 3 b of the rightmost electric double layer capacitor 9 is in surface contact with the negative electrode current terminal plate 10 b, and the negative electrode current terminal plate 10 b is drawn out of the module container 14.

  The positive electrode current terminal plate 10a, the plurality of electric double layer capacitors 9, and the negative electrode current terminal plate 10b are given a surface pressure so as to be sandwiched from both the left and right sides by the surface pressure adjusting mechanism 12 and the tightening belt 13. As a result, the positive electrode current terminal plate 10a and the positive electrode current collector plate 3a of the leftmost electric double layer capacitor 9 are in close contact, the positive electrode current collector plate 3a and the negative electrode current collector plate 3b are in close contact, and the right end electric double layer capacitor. 9 is kept in close contact with the negative electrode current collector plate 3b and the negative electrode current terminal plate 10b. Moreover, since the positive electrode current collector plate 3a and the negative electrode current collector plate 3b are pressurized in a direction to be pressed against the outer case 1, the sealing effect by the positive electrode seal layer 4a and the negative electrode seal layer 4b shown in FIG. As the surface pressure adjusting mechanism 12, a spring mechanism such as a disc spring or a spring spring, rubber, a bag containing liquid, or the like can be used.

  The positive current collector 3a and the negative current collector 3b of the electric double layer capacitor 9 adjacent to each other are in contact with each other over a wide area, and the thickness of each current collector is as thin as 1 mm or less. The electrical resistance is very small. Accordingly, the charge / discharge efficiency can be kept high even for instantaneous charge / discharge. Moreover, since the calorific value resulting from the electrical resistance is reduced, it is possible to suppress the situation where the electrolytic solution is decomposed due to a temperature rise.

Embodiment 2. FIG.
FIG. 10 is a side view schematically showing the positional relationship between the positive electrode 6a, the negative electrode 6b, and the separator 7 in the electric double layer capacitor according to the second embodiment of the present invention, corresponding to FIG. A plurality of positive electrode plates in which a thin plate-like positive electrode 6a is formed on the bottom surface of the thin plate-like positive electrode collector electrode 5a are bent and similarly, a thin plate-like negative electrode collector 6b is formed on the upper surface of the thin plate-like negative electrode collector electrode 5b. The cell portion is formed by bending a plurality of negative electrode plate-like bodies formed by bending the positive electrode plate-like body and the negative electrode plate-like body with the separator 7 therebetween.

  The left end surface of the positive electrode current collecting electrode 5a is a positive electrode current collecting electrode 5aa in close contact with the positive electrode current collector plate 3a. Similarly, the right end surface of the negative electrode current collecting electrode 5b is in close contact with the negative electrode current collecting plate 3b. This is a negative electrode collecting electrode 5bb.

  In this structure, a sheet in which a carbon layer as the positive electrode 6a is formed on one side of the long positive electrode collecting electrode 5a and a negative electrode 6b on one side of the negative electrode collecting electrode 5b having the same length as the positive electrode collecting electrode 5a. And a separator 7 having the same length as the positive electrode current collecting electrode 5a is prepared and bonded together to form an integral sheet, and then the integral sheet is bent multiple times. It can be formed by compressing with a press mechanism.

  According to the electric double layer capacitor according to the second embodiment, the positive current collecting electrode 5a and the negative current collecting electrode 5b are each formed as an integral structure. Therefore, unlike the first embodiment, it is not necessary to join the plurality of positive electrode collecting electrodes 5a and the plurality of negative electrode collecting electrodes 5b by ultrasonic welding or the like, so that the manufacturing cost can be reduced.

It is sectional drawing which shows the structure of the electric double layer capacitor which concerns on Embodiment 1 of this invention. It is sectional drawing which expands and shows the structure of the part in which the positive electrode current collecting plate is formed among the structures shown in FIG. It is a front view which expands and shows the structure of the part in which the positive electrode current collecting plate is formed among the structures shown in FIG. It is a side view which shows typically the positional relationship of the positive electrode, the negative electrode, and a separator in the electric double layer capacitor which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the assembly procedure of the electric double layer capacitor which concerns on Embodiment 1 of this invention in process order. It is sectional drawing which shows the assembly procedure of the electric double layer capacitor which concerns on Embodiment 1 of this invention in process order. It is sectional drawing which shows the assembly procedure of the electric double layer capacitor which concerns on Embodiment 1 of this invention in process order. It is sectional drawing which shows the assembly procedure of the electric double layer capacitor which concerns on Embodiment 1 of this invention in process order. It is sectional drawing which shows the structure of the electric double layer capacitor module which concerns on Embodiment 1 of this invention. It is a side view which shows typically the positional relationship of the positive electrode, the negative electrode, and a separator in the electric double layer capacitor which concerns on Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exterior case, 3a Positive electrode current collecting plate, 3b Negative electrode current collecting plate, 4a Positive electrode seal layer, 4a1-4a3 Fusion | fusion part, 4b Negative electrode seal layer, 5a, 5aa Positive electrode current collection electrode, 5b, 5bb Negative electrode current collection electrode, 6a Positive electrode, 6b Negative electrode, 7 Separator, 20a Positive electrode current collecting hole, 20b Negative electrode current collecting hole, 21a Positive electrode sealing hole, 21b Negative electrode sealing hole.

Claims (6)

A cell part having a positive electrode and a negative electrode facing each other across the separator;
Constituting the first main surface of the cell portion, and a positive electrode current collecting electrode connected to the positive electrode;
A negative current collecting electrode that constitutes a second main surface of the cell portion that is in a front-back relationship with the first main surface of the cell portion, and is connected to the negative electrode;
An outer case in which the cell portion is housed, wherein a positive current collecting hole is formed in a first main surface of the outer case facing the first main surface of the cell portion, and the second main portion of the cell portion is formed. An outer case in which a negative electrode current collecting hole is formed on the second main surface of the outer case facing the surface;
A positive electrode sealing layer in which a positive electrode sealing hole corresponding to the positive electrode current collecting hole is formed;
A negative electrode sealing layer in which a negative electrode sealing hole corresponding to the negative electrode current collecting hole is formed;
A central portion inserted into the exterior case from the outside of the first main surface of the exterior case through the positive electrode seal hole and the positive electrode current collection hole, and the central portion is in close contact with the positive electrode current collection electrode A positive electrode current collector plate,
The outer case has a central portion inserted into the outer case from the outer side of the second main surface through the negative electrode seal hole and the negative electrode current collecting hole, and the central portion is in close contact with the negative electrode collecting electrode An electric double layer capacitor comprising the negative electrode current collector plate. The positive electrode sealing layer and the negative electrode sealing layer are made of a thermoplastic resin,
The peripheral edge portion of the positive electrode current collector plate and the outer case are in close contact with each other through the fusion portion of the positive electrode seal layer melted by heating,
2. The electric double layer capacitor according to claim 1, wherein a peripheral edge portion of the negative electrode current collector plate and the outer case are in close contact with each other through a fusion portion of the negative electrode seal layer melted by heating. The fused portion of the positive electrode sealing layer is formed in at least a double ring shape around the positive electrode current collecting hole,
3. The electric double layer capacitor according to claim 2, wherein the fused portion of the negative electrode sealing layer is formed in at least a double ring shape around the negative electrode current collecting hole. The positive electrode sealing layer is in close contact with the positive electrode current collecting electrode by a fusion part around the positive electrode sealing hole melted by heating,
4. The electric double layer capacitor according to claim 2, wherein the negative electrode sealing layer is in close contact with the negative electrode collecting electrode by a fusion part around the negative electrode sealing hole melted by heating. 5.   A plurality of positive plate members having the plate-like positive electrode formed on the plate-like positive electrode collector electrode are bent and bent to form a negative plate member having the plate-like negative electrode formed on the plate-like negative electrode collector electrode. 5. The cell portion is configured according to any one of claims 1 to 4, wherein the cell portion is configured by bending multiple times and causing the positive electrode plate and the negative electrode plate to face each other with the separator interposed therebetween. Electric double layer capacitor. The first and second electric double layer capacitors according to any one of claims 1 to 5,
The first and second electric current collectors are arranged such that the positive current collector plate included in the first electric double layer capacitor and the negative current collector plate included in the second electric double layer capacitor are in surface contact with each other. An electric double layer capacitor module in which multilayer capacitors are arranged.

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