JPH10125559A - Electric double layer capacitor and capacitor device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small electric double layer capacitor with a large capacitance which can be manufactured easily, and to provide a capacitor device with a smaller internal resistance capable of obtaining a higher output density per unit volume. SOLUTION: An electric double layer capacitor 1 consists of a plurality of electrode plates 3 stacked between long separators 2 which are alternately folded at every predetermined length thereof and are impregnated with an electrolytic solution. There are flexible current collecting members 4 connected to the ends of respective electrode plates 3 and are pulled out from between the separators 2. The current collecting members 4 of same polarity are bundled together on the same side for each polarity, and the bundled current collecting members 6, 7 for each polarity are disposed on the different outermost layer side in the stacking direction. In a capacitor device in which a plurality of electric double layer capacitors 1 are stacked in the stacking direction of the electrode plate 3, the bundled current collecting members 7 of a capacitor are connected to the bundled current collecting members 6 of an adjacent capacitor. Case members in which the capacitors 1 are put in are stacked, and the stacked case members are coupled each other with clip members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric double layer capacitor and a capacitor device in which a plurality of electric double layer capacitors are connected in series.

[0002]

2. Description of the Related Art In general, at an interface where two different phases of a solid electrode and a solution are in contact with each other, positive and negative charges are arranged facing each other at an extremely short distance to form an electric double layer. The capacitance when an electric field is applied is proportional to the surface area of the electrode interface. Therefore, it is known to use the electric double layer as a capacitor by using a substance having a large specific surface area such as activated carbon as a solid electrode.

As a capacitor utilizing the electric double layer, an electric double layer capacitor as described in Japanese Utility Model Laid-Open No. 3-69222 has been known. FIG.
As shown in FIG.
1 is a separator 32 composed of a long cloth made of polyethylene, polypropylene or the like impregnated with an electrolyte solution.
Are alternately folded in different directions at predetermined intervals, and a plurality of plate-like activated carbon electrodes 3 are interposed between the bellows-like separators 32.
3 are arranged and laminated. In the electric double layer capacitor 31, the current collecting members 35a, 35b having the comb-shaped projections 34 while the separators 32 on both sides of the activated carbon electrode 33 stacked as described above are folded back. Is inserted between the separators 32 and the projections 34 of the current collecting members 35a and 35b are
To connect to.

[0004] In this manner, the activated carbon electrodes 33 stacked as described above are alternately connected one by one to the different current collecting members 35a and 35b, and the plurality of activated carbon electrodes 33 connect the separator 32 to each other. Different poles are arranged to face each other via the
Can be reduced in size and capacity.

However, in the conventional electric double layer capacitor 31, when each of the current collecting members 35a and 35b is inserted, the projection 34 comes into contact with the separator 32 made of cloth such as polyethylene or polypropylene, and this is removed. There is a possibility that the separator 32 may be damaged, and if the separator 32 is prevented from being damaged, the manufacturing method becomes complicated.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electric double layer capacitor which is small in size, has a large capacitance, and is easy to manufacture, while solving such disadvantages.

Another object of the present invention is to provide a capacitor device having a low internal resistance and a high output density per unit volume when the electric double layer capacitors are connected in series.

[0008]

In order to achieve the above object, an electric double layer capacitor according to the present invention comprises: a long separator impregnated with an electrolyte solution and alternately folded in different directions at predetermined lengths; In an electric double-layer capacitor including a plurality of electrode plates stacked so that different poles face each other through the separator between the separators,
A flexible current collecting member connected to the end of each electrode plate and drawn out from between the separators is provided, and the current collecting member is placed on the same side with respect to the electrode plate in a direction parallel to the electrode plate for each pole. And the bound current collecting members are arranged on the outermost layer side different in the laminating direction of the electrode plates for each same pole.

According to the electric double layer capacitor of the present invention,
By pulling out a flexible current collector connected to the end of each electrode plate from between the separators, the current collectors are bound for the same pole. Therefore, the electric double layer capacitor of the present invention can be easily manufactured without a risk of the separator being damaged because the current collecting member is connected to each electrode plate.

The current collecting member is bound on the same side with respect to the electrode plate in a direction parallel to the electrode plate for each same pole, and the bound current collecting member is placed in a phase in the stacking direction of the electrode plate. It is located on a different outermost layer side. Therefore, the electric double layer capacitor of the present invention is a unitary cell, and the unitary cells are stacked in the stacking direction of the electrode plates. The members can be easily connected between adjacent single cells, and can be easily connected in series.

Therefore, a capacitor device of the present invention is a capacitor device in which the electric double layer capacitor of the present invention is stacked in a plurality in the stacking direction of the electrode plates, wherein a bundle of one electric double layer capacitor is bound. The current member is connected to a current collecting member having a different pole of another adjacent electric double layer capacitor.

In the capacitor device according to the present invention, the plurality of electric double layer capacitors are stacked with a conductive plate disposed along the electrode plate between the capacitors with the separator interposed therebetween. The bound current collector of the electric double layer capacitor is connected to one end of the conductive plate, and the bound current collector of a different pole of another adjacent electric double layer capacitor is connected to the other end of the conductive plate. (1st aspect), or the bound current collecting member of one electric double layer capacitor is connected to the bound current collecting member of a different pole of another adjacent electric double layer capacitor. An electrical member is connected to the electrode plate on the same side in a direction parallel to the electrode plate (second aspect).

According to the capacitor device of the first aspect, since the conductive plate is disposed between the electric double layer capacitors, the shape of the electric double layer capacitor can be maintained by the conductive plate. In addition, since the bound current collecting members of the adjacent electric double layer capacitors are connected to the same conductive plate, the internal resistance for connecting the bound current collecting members can be reduced.

According to the capacitor device of the second aspect, the bound current collecting members of the adjacent electric double layer capacitors are connected on the same side to the electrode plate in a direction parallel to the electrode plate. Therefore, the internal resistance for the connection can be further reduced.

Further, in the second aspect, it is possible to connect the current collecting members of different poles of the adjacent electric double layer capacitors without arranging a conductive plate between the electric double layer capacitors. However, similarly to the first aspect, a conductive plate may be provided between the electric double-layer capacitors, and the bound current collecting member may be connected to the conductive plate. According to the conductive plate, an effect of maintaining the shape of the electric double layer capacitor can be obtained as in the first embodiment.

Further, in the capacitor device according to the present invention, the electric double-layer capacitor may be placed in a cylindrical non-conductive case member having upper and lower open ends by the case member in a direction parallel to the lamination direction of the electrode plates. The case members are stacked so as to be surrounded by the conductive member, and the case members are stacked via the conductive plate, and the stacked case members are connected to each other by sandwiching the conductive plate.

According to the above configuration, the non-conductive case member serves as a housing for housing the electric double layer capacitor, and the conductive plate forms a part of the housing, that is, a top plate or a bottom plate. . Therefore, the volume of the electric double layer capacitor occupying a unit volume is increased, and the output density can be increased.

Further, the non-conductive case member is provided with a rib along the opening end portion, and is provided along the opening end portion of one case member when laminated via the conductive plate. The rib provided is connected to a rib provided along the opening end of another adjacent case member by sandwiching the rib with a clip member. According to the case member, a desired number of the case members can be easily connected to each other by the clip member, and the electric double layer capacitors can be connected in series to facilitate a capacitor device having a desired withstand voltage. Can be configured.

Further, the capacitor device of the present invention is characterized in that it comprises a non-conductive cover member for closing the open end of the stacked case members via the conductive plate. In the capacitor device of the present invention, when the case members are stacked as described above, the upper and lower open ends of the case member are closed with the lid member, so that the case member and the lid member are closed. The electric double layer capacitor can be sealed in a space constituted by

The cover member includes a socket portion and a terminal provided in the socket portion and connected to the conductive plate, thereby connecting the capacitor device of the present invention to an external device through the socket portion. be able to. Further, the lid member is provided with a rib along an outer edge thereof, and when closing the end of the case member via the conductive plate, the rib and the opening end of the adjacent case member are closed. Are connected to each other by sandwiching the rib provided along with the clip member, whereby the capacitor device of the present invention can be easily formed together with the case member.

Further, the non-conductive case member has an introduction hole for introducing an electrolyte solution impregnated in the separator, and the introduction hole is closed by a closing member after the introduction of the electrolyte solution. I do. According to the case member, after the electric double layer capacitor is sealed in the space formed by the case member and the lid member as described above, the electrolyte solution can be introduced from the introduction hole. . Further, when the internal pressure of the capacitor device in which the electric double layer capacitor is sealed increases, the closing member is pushed out of the introduction hole, so that the inside and outside of the capacitor device are conducted through the introduction hole, and the internal pressure increases. Can be released.

Further, in the capacitor device according to the present invention, the electric double-layer capacitor may include a conductive case member having a tubular shape and having upper and lower open ends, and an inner portion formed integrally with the case member by traversing the inside of the case member. In the space defined by the electrically formed conductive plate, the conductive plate is sandwiched therebetween and the side surface parallel to the laminating direction of the electrode plates is surrounded by the case member and housed therein. It is characterized by being laminated via an insulating member arranged between the members, and the laminated case members are mutually connected.

According to the above configuration, the conductive case member and the conductive plate are integrally formed to form a housing for accommodating the electric double layer capacitor. The volume is even larger,
The power density can be increased.

The conductive case member has a rib provided along the opening end, and the rib provided along the opening end of one case member when laminated via the insulating member. And a rib provided along the opening end of another adjacent case member is sandwiched by an insulating clip member so as to be connected to each other. According to the case member, a desired number of the case members can be easily connected to each other by the clip member, and the electric double layer capacitors can be connected in series to facilitate a capacitor device having a desired withstand voltage. Can be configured. In addition, as long as insulation between the case members can be ensured, the case members may be connected to each other by bolts or the like instead of the clip members.

Further, according to the case member, when laminated as described above, the uppermost layer and the lowermost layer of the case member are spaces without the electric double layer capacitor, so that the uppermost layer and the lowermost layer are not provided. The conductive plate integrally formed with the lower case member serves as a top plate and a bottom plate of the capacitor device. Therefore, the capacitor device of the present invention constituted by the conductive case member can be easily connected to a conductive plate integrally formed with the uppermost and lowermost case members, thereby facilitating external devices. Can be connected to

Incidentally, when the conductive case members are laminated as described above, the uppermost layer and the lowermost layer of the case members are provided with the above-mentioned conductive member to prevent the conductive plate from being exposed and to protect the conductive plate. It is desirable to provide a non-conductive cover member similar to that used for the non-conductive case member.

The conductive case member has an introduction hole for introducing an electrolyte solution impregnated in the separator, and the introduction hole is closed by a closing member after the introduction of the electrolyte solution. According to the case member, after sealing the electric double layer capacitor in the space defined by the case member and the conductive plate as described above,
The electrolyte solution can be introduced from the introduction hole. Further, when the internal pressure of the capacitor device in which the electric double layer capacitor is sealed increases, the closing member is pushed out of the introduction hole and the capacitor is moved by the introduction hole, as in the case of the non-conductive case member. The internal pressure can be released by conducting the inside and outside of the device.

[0028]

Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is an explanatory sectional view showing the structure of the electric double layer capacitor of the present invention, FIG. 2 is an explanatory sectional view showing a method for manufacturing the electric double layer capacitor shown in FIG. 1, and FIG. FIG. 4 is an explanatory cross-sectional view showing an example of connecting the electric double layer capacitors in series.

FIG. 4 is a perspective view showing an example of the structure of a single cell constituting the capacitor device of the present invention. FIG. 5 is a sectional view taken along the line V--V of FIG. 4, and FIG. FIG. 7 is a sectional view taken along the line VI, and FIG. 7 is a front view of the capacitor device of the present invention.

FIG. 8 is an explanatory sectional view showing another example of connecting the electric double layer capacitors shown in FIG. 1 in series.
9 and 10 are explanatory sectional views showing another example of the method of binding the current collecting members shown in FIG. 1, and FIG. 11 shows another example of the structure of the unit cell constituting the capacitor device of the present invention. It is explanatory sectional drawing.

As shown in FIG. 1, the electric double-layer capacitor 1 of the present invention has a long separator 2 impregnated with an electrolyte solution which is alternately folded in different directions at predetermined intervals to form a bellows-shaped separator. A plurality of electrode plates 3 are stacked so that different poles face each other with the separator 2 interposed therebetween. A flexible current collecting member 4 having substantially the same width as the electrode plate 3 is connected to an end of each electrode plate 3, and the current collecting member 4 is embedded over the entire length of the electrode plate 3.

One end of each of the electrode plates 3 is wrapped by the separator 2 folded in a bellows shape as described above, and the other end not wrapped by the separator 2 is exposed on the side surface. The current collecting member 4 is drawn out from between the separators 2 at the exposed end. Since the end portions of each electrode plate 3 are alternately exposed on the opposite side surface, the current collecting member 4 is pulled out to the same side with respect to the electrode plate 3 in a direction parallel to the electrode plate 3 for each same pole. Will be.
As a result, the drawn out current collecting members 4 are collected for each same pole, and bound by the binding member 5 having a C-shaped cross section. The binding member 5 itself is made of a conductive material.

In the above configuration, the separator 2 is folded back in a bellows shape in the direction parallel to the direction in which the current collecting member 4 is connected, but in the direction in which the current collecting member 4 is connected. It may be folded back in a bellows shape in a direction perpendicular to the direction.

The binding portions 6 and 7 of the current collecting member 4 by the binding member 5 are arranged on the outermost layer side different in the laminating direction of the electrode plate 3 for each same pole, for example, in the case of FIG. Is disposed on the uppermost layer side, and the binding portion 7 is disposed on the lowermost layer side.

The material constituting the separator 2 is a polyolefin such as polyethylene or polypropylene, since it is insoluble in organic solvents such as ester, ketone and ether used in ordinary secondary batteries. Any resin material that is commercially available as an ordinary filtration membrane, such as a resin comprising a copolymer of the above, polyamide, polycarbonate, aromatic polyamide, fluororesin, etc., can be used widely.

Polyolefins such as polyethylene and polypropylene and copolymers thereof are preferable because they are excellent in chemical resistance and inexpensive, and have a shutdown (heat blocking) property when used as a capacitor. In addition, since the polyamide and the polycarbonate have higher strength than the polyolefin, they are preferable in that when used as a capacitor, excellent strength against electrode pressing force can be obtained. Further, the aromatic polyamide and the fluororesin (ethylene tetrafluoride, vinylidene fluoride, etc.) are preferable because they have excellent chemical resistance and heat resistance and can withstand dry use at high temperature when used as a capacitor. .

The separator 2 is appropriately selected from the resin materials in consideration of the characteristics according to the use and type of the capacitor, etc., and is formed as a stretched, coated, fibrous porous film, or a composite of the resin materials. It can be used as a film.

When each of the above-mentioned resin materials is used as a single film, any one of them can be made very thin and its thickness can be reduced to several μm. Suitable for high density packing. Further, when folded back in a bellows-like manner as described above, the folded portion bends flexibly, and insulation at this portion can be guaranteed.

When each of the above resin materials is used as a composite film, more excellent durability against the electrode pressing force is obtained, and even when the base material of the composite film is damaged, the base material can be used. Insulation can be maintained by the thin film layer composited with the material.

It should be noted that polycarbonate may be dissolved in propylene carbonate (PC), so care must be taken.

Examples of the electrolyte solution impregnated in the separator 2 include acetonitrile, propylene carbonate (PC), gamma-butyrolactone (GB)
L) and gamma valerolactone (GVL) in a solvent such as tetraethylammonium tetrafluoroboron salt (TEATFB)
Is used. Solvents such as acetonitrile, propylene carbonate, and gamma-butyrolactone have a high relative dielectric constant and an excellent solubility of the electrolyte, so that high conductivity can be obtained. Therefore, when filling a high-density electrode, the resistance can be reduced by the high conductivity. Further, since the electrolyte solution has a low viscosity, it is possible to obtain good permeability to the details of the electrode.

For example, when PC is used as a solvent, the concentration of the electrolyte solution is expected to increase as the concentration of TEATFB increases. However, in order to obtain stable solubility, the concentration of the electrolyte solution should be about 1 mol / liter. Is preferred. still,
The concentration of the electrolyte solution may be 1 mol / liter or less, and the concentration of the electrolyte solution does not limit the characteristics of the electric double layer capacitor of the present invention.

The electrode plate 3 is made of powdered, granular or fibrous activated carbon made of polytetrafluoroethylene (PTF).
E), cellulose, pullulan, gum arabic, PVA,
It is composed of a plate-like activated carbon or the like obtained by mixing with a binder such as PVDF, acrylic curdlan, or bulletin, and forming into a sheet or belt shape. Ketjen black, acetylene black,
Graphite, metal powder and the like can be appropriately mixed as a conductive agent.

Further, the electrode plate 3 may be made of fibrous activated carbon in a close shape. The electrode plate 3 is
By making the fibrous activated carbon into a close shape, the electrolyte solution can easily penetrate, lower resistance can be achieved, and a binder (binder) and a conductive material are not required.

Further, since the electrode plate 3 made of fibrous activated carbon in a close shape has a certain elasticity, the separator 2 is hardly damaged. In addition, since a certain degree of pressure can be applied during packaging, the resistance of the electrode plate 3 and the current collecting member 4 can be reduced, and the capacity can be increased.

The activated carbon can be produced by carbonizing raw materials such as coconut shell, pitch, petroleum coke, phenol, and sawdust, and then activating with steam or KOH. In addition, as a raw material of the fibrous activated carbon, a phenol-based material is preferable from the viewpoint of, for example, ease of production when forming into a clos-like form. These activated carbons are 100
It has a specific surface area of ３3000 m ² / g.

The flexible current collector 4 has a thickness of 0.1 mm.
Use about aluminum foil. As a material of the current collector 4, an aluminum-based metal such as aluminum or an aluminum alloy is preferably used because it can operate in a wide voltage range, is lightweight, and has excellent workability. Although limited by the operating voltage, a metal such as nickel, titanium, copper, iron, or an alloy thereof can be used.

As shown in FIG. 2, the electric double layer capacitor 1 has an electrode plate 3 disposed on a separator 2 pulled out from a coil 8, and the separator 2 is placed at the tip of the electrode plate 3 on the electrode plate 3 side. By repeating the operation of folding and placing the electrode plate 3 again on the folded separator 2,
It can be easily manufactured.

In the electric double layer capacitor 1, since the binding portions 6, 7 of the current collecting member 4 are arranged on the uppermost layer side and the lowermost layer side in the stacking direction of the electrode plate 3 as described above, the electric double layer capacitor By using the capacitor 1 as a single cell and further stacking a plurality of single cells in the stacking direction of the electrode plates 3, a capacitor device connected in series can be easily configured.

FIG. 3 shows an example in which electric double layer capacitors 1a and 1b arranged in the same direction are stacked with a conductive plate 9 interposed between the separators 2 and 2.
At this time, in the electric double layer capacitor 1a, the binding portion 7 of the current collecting member 4 arranged on the lowermost layer side of the stacked electrode plates 3 is connected to one of the conductive plates 9 interposed between the electric double layer capacitors 1a and 1b. Electric double layer capacitor 1 connected to the end
3B, the binding portion 6 of the current collecting member 4 arranged on the uppermost layer side of the stacked electrode plates 3 has the electric double layer capacitors 1a and 1b.
It is connected to the other end of the conductive plate 9 interposed between the electrodes b. That is, the binding portion 7 of the current collecting member 4 of the electric double layer capacitor 1a and the binding portion 6 of the current collecting member 4 of the electric double layer capacitor 1b are connected to the conductive plate 9 interposed between the capacitors 1a and 1b.
Connected through.

The conductive plate 9 is an aluminum plate having a thickness of about 0.5 mm. As a material for the conductive plate 9, aluminum or an aluminum alloy is preferably used because it can operate in a wide voltage range. Although limited by the operating voltage, a metal such as nickel, titanium, copper, iron, or an alloy thereof can be used.

In the capacitor device of the present invention, when a plurality of electric double layer capacitors 1 are stacked, each electric double layer capacitor 1 is connected to the case member 10 shown in FIGS.
Housed in The case member 10 is made of polytetrafluoroethylene (PTFE), which is a non-conductive resin. According to the polyolefin, the case member 10 can be formed by injection molding, and can be fused at the time of molding.

The case member 10 has a cylindrical shape and has upper and lower open ends, and surrounds the side surfaces in the stacking direction of the electrode plates 3 stacked as described above in the electric double layer capacitor 1 housed therein. It has become. Case member 10
When the electric double layer capacitor 1 is housed, the separator 2 and the binding portion 6 of the current collecting member 4 are exposed at one open end (the upper end in the case of FIG. 4) and the other open end A conductive plate 9 to which the binding portion 7 of the current collecting member 4 is welded as shown in FIG. Note that a groove 12 into which a seal member (not shown) is fitted is provided on the upper end surface and the lower end surface of the case member 10.

A lateral rib 13a formed along the upper edge and the lower edge, and a lateral rib 13
vertical ribs 13b, 13 that connect the vertical ribs 13a, 13a in the vertical direction.
c, 13d, and a communication hole 14 communicating with the inner surface of the case member 10 is provided in the vertical rib 13b.

The communication hole 14 is an introduction hole for introducing the electrolyte solution impregnated in the separator 2, and the ball 15 shown in FIG. 6 is fitted after the introduction of the electrolyte solution. Ball 15 is P
It is a closing member made of the same resin as the case member 10 such as TFE and sealing and closing the communication hole 14. Ball 15
Is a single cell 11 (electric double layer capacitor 1) as described later.
Is stacked on the case member 10), which is pushed out from the communication hole 14 when the internal pressure of the capacitor device is increased, and the communication hole 14
The inside and the outside of the capacitor device are electrically connected via the.

As shown in FIG. 7, the capacitor device 16 of the present invention is formed by stacking a plurality of unit cells 11 in the same direction as the stacking direction of the electrode plates 3. In the capacitor device 16, the end plate 1 is provided on the uppermost layer and the lowermost layer.
7a and 17b are arranged.

The end plate 17a is formed of the same resin as the case member 10, such as PTFE resin, in such a shape that the upper end of the case member 10 can be closed. Along the lower end edge, a lateral rib 13a similar to the case member 10 is formed. Are formed. In addition, the end plate 17a is provided with a socket 19a having a terminal 18a inside at the center of the upper surface. The end plate 17a is connected to the binding portion 6 (not shown) of the current collecting member 4 of the electric double layer capacitor 1 housed in the adjacent single cell 11 via the conductive plate 9 arranged at the lower end. In addition, the terminal 18a is connected to the conductive plate 9.

The end plate 17b is connected to the case member 10
It has the same configuration as the end plate 17a, except that it is formed in a shape that allows the lower end of the case member 10 to be closed. A horizontal rib 13a similar to that of the case member 10 is formed along the upper edge of the end plate 17a. A socket 19b having a terminal 18b therein is provided in the center. The end plate 17b is configured such that the terminal 18b is connected to the conductive plate 9 provided in the adjacent single cell 11.

A plurality of unit cells 11 stacked as described above
And the end plates 17a, 17b are
0, the plurality of electric double layer capacitors 1 connected in series are connected to the plurality of case members 1.
0 and the space defined by the end plates 17a and 17b, the capacitor device 16 is formed.

As shown in FIG. 7, the clip member 20 has a C-shaped cross section and has elasticity, and the single cells 11 adjacent to the opening or the single cells 11 and the end plate 17 are provided.
When the horizontal ribs 13a, 13a are fitted to the horizontal ribs 13a, 13b, the horizontal ribs 13a, 13a are held by the elasticity.
The clip member 20 has the vertical rib 1 on the short side of the unit cell 11.
3b, two longitudinal ribs 13 on the long side of the unit cell 11.
A total of four are arranged on both sides of c or 13d.

After connecting the plurality of single cells 11 and the end plates 17a and 17b as described above, the capacitor device 16 is supplied with TE solution as an electrolyte solution through the communication hole 14.
A 1 mol / liter-PC solution of ATFB is introduced, and the separator 2 is impregnated with the electrolyte solution. Then, after the introduction of the electrolyte solution, the ball 15 is driven into the communication hole 14 to be sealed, thereby completing the capacitor device 16. In the capacitor device 16, charging and discharging can be performed by the terminals 18a and 18b.

In this embodiment, by connecting 12 single cells 11 each having a capacitance of 1000F in series, a capacitor device 1 having a capacitance of 83.3F and an internal resistance of 7.86 mΩ is connected.
6 was obtained. The capacitor device 16 has a rated voltage of 15 to
30 kW, rated voltage 125 A, 2 kW x 10 seconds, 20 k
The output of J was obtained.

In this embodiment, as shown in FIG. 3, electric double layer capacitors 1a and 1b arranged in the same direction are laminated with a conductive plate 9 interposed between the separators 2 and 2. However, as shown in FIG.
a and 1b may be arranged so as to be line-symmetric with respect to the conductive plate 9 interposed between the separators 2 and 2.
By doing so, the binding portion 7 of the current collecting member 4 of the electric double layer capacitor 1a and the binding portion 6 of the current collecting member 4 of the electric double layer capacitor 1b are connected to the conductive plate 9 interposed between the capacitors 1a and 1b. Connected to the same side end of
The internal resistance for connecting both capacitors 1a and 1b in series can be further reduced.

The electric double layer capacitors 1a and 1b are
As described above, when connecting and symmetrically arranging, the binding portion 7 of the current collecting member 4 of the electric double layer capacitor 1a and the electric double layer capacitor without the conductive plate 9 interposed between the capacitors 1a and 1b. You may make it connect directly with the binding part 6 of the current collection member 4 of 1b.

In this embodiment, the current collecting members 4 are bound by using the binding member 5 for each same pole of each electric double layer capacitor 1, and the binding portions 6, 7 are connected to the conductive plate via the binding member 5. 9, as shown in FIG. 9 (a), each current collecting member 4 is provided for each same pole of the electric double layer capacitor 1.
The current collector 4 may be bound by binding the current collector 4 to the conductive plate 9 using the clip member 5a. In the case shown in FIG. 9A, each current collecting member 4 can be directly brought into contact with the conductive plate 9 to be bound, so that it is not necessary to weld the binding member 5 to the conductive plate 9. In addition, the clip member 5a may not be conductive itself and may be a resin such as PTFE, as long as the clip member 5a has elasticity for fixing the current collecting member 4 to the conductive plate 9.

When the electric double layer capacitors 1a and 1b are arranged so as to be line-symmetric with respect to the conductive plate 9 interposed therebetween, as shown in FIG. The current collecting members 4 having different poles 1a and 1b alternately wrap the conductive plate 9, and the conductive plates 9 wrapped by the current collecting members 4 are positioned on the inner surface corresponding to the current collecting members 4. Member 10a provided with a recess 5b in
You may make it clamp between 10a. 9B, the conductive plate 9 wrapped by the current collecting members 4 is fitted into the recess 5b formed between the case members 10a, 10a. Each current collecting member 4 can be directly contacted with the conductive plate 9 to be bound without using the binding member 5.

Further, each current collecting member 4 is bound for each same pole of each electric double layer capacitor 1 and welded to a current collecting plate 21 made of a conductive member as shown in FIG. May be further welded to the conductive plate 9.

Further, in this embodiment, the case member 10
Is formed of a resin such as the non-conductive FETP, as shown in FIG. 11, a case member 22 having a tubular shape and having upper and lower open ends is formed of aluminum, and the conductive plate 9 is formed of a case member 22. It may be formed integrally with the case member 22 across the inside. The case member 22 includes a horizontal rib 23 formed along the upper end edge and the lower end edge, and a communication hole (not shown) for introducing an electrolyte solution.

According to the case member 22, the lower half of the electric double layer capacitor 1 a is accommodated in the space defined by the conductive plate 9 and the case member 22 above the conductive plate 9. The conductive plate 9 and the case member 22
The upper half of the electric double layer capacitor 1b is accommodated in the space defined by. And electric double layer capacitor 1
The binding portion 7 of the current collecting member 4 of FIG. 7A and the binding portion 6 of the current collecting member 4 of the electric double layer capacitor 1b are connected to the same side end of the conductive plate 9.

Since the case members 22 themselves are conductive, they are laminated with an insulating member 24 made of a non-conductive material such as PTFE resin interposed between the case members 22. The electric double layer capacitor 1a accommodated in the case member 22 has a lower half accommodated in a space defined by the conductive plate 9 and the case member 22 above the conductive plate 9, and an upper half composed of an adjacent case member. 22 is accommodated in a space defined by the conductive plate 9 and the case member 22 below the conductive plate 9.

The case member 2 laminated as described above
2, by sandwiching the lateral rib 23 and the lateral rib 23 of the adjacent case member 22 with an insulating clip member (not shown) in the same manner as in the capacitor device 16 shown in FIG.
The case members 22 are mutually connected.

In the example of FIG. 11, the electric double layer capacitors 1a and 1b are arranged symmetrically with respect to the conductive plate 9, but as shown in FIG. 3, the electric double layer capacitors 1a and 1b are arranged in the same direction. May be arranged.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing a configuration of an electric double layer capacitor of the present invention.

FIG. 2 is an illustrative sectional view showing a method for manufacturing the electric double-layer capacitor shown in FIG.

FIG. 3 is an explanatory sectional view showing an example in which the electric double layer capacitors shown in FIG. 1 are connected in series.

FIG. 4 is a perspective view showing a configuration example of a single cell constituting the capacitor device of the present invention.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

FIG. 6 is a sectional view taken along line VI-VI of FIG. 4;

FIG. 7 is a front view of the capacitor device of the present invention.

8 is an explanatory sectional view showing another example of connecting the electric double layer capacitors shown in FIG. 1 in series.

FIG. 9 is an explanatory sectional view showing another example of a method of binding the current collecting members shown in FIG. 1;

FIG. 10 is an illustrative sectional view showing still another example of a method of binding the current collecting members shown in FIG. 1;

FIG. 11 is an explanatory cross-sectional view showing another configuration example of the single cell constituting the capacitor device of the present invention.

FIG. 12 is an explanatory sectional view showing a configuration of a conventional electric double layer capacitor.

[Explanation of symbols]

1. Electric double layer capacitor 2. Separator 3.
Electrode plate, 4 ... current collecting member, 6, 7 ... bound current collecting member, 9 ... conductive plate, 10 ... non-conductive case member, 2
2 ... conductive case member, 24 ... insulating member.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroto Kobayashi 1-4-1, Chuo, Wako-shi, Saitama

Claims (14)

[Claims] 1. A plurality of long separators impregnated with an electrolyte solution and alternately folded in different directions at predetermined lengths, and stacked between the separators so that different poles face each other via the separators. In an electric double layer capacitor comprising an electrode plate, a flexible current collector connected to an end of each electrode plate and drawn out between the separators is provided, and the current collector is attached to the electrode plate for each same pole. An electric double layer, wherein the current collectors are bound on the same side with respect to the electrode plate in a parallel direction, and the bound current collecting members are arranged on different outermost layers in the stacking direction of the electrode plate for each same pole. Capacitors. 2. A plurality of long separators impregnated with an electrolyte solution and alternately folded in different directions at predetermined lengths, and a plurality of stacked separators having different poles facing each other via the separators. A flexible current collecting member connected to the end of each electrode plate and drawn out from between the separators is provided, and the current collecting member is arranged in the direction parallel to the electrode plate for each pole. A plurality of electric double-layer capacitors in which the bundled current collectors are arranged on the outermost side different from each other in the lamination direction of the electrode plate for each same pole in the lamination direction of the electrode plate are provided. A stacked capacitor device, wherein a bound current collecting member of one electric double layer capacitor is connected to a bound current collecting member of a different pole of another adjacent electric double layer capacitor. Characteristic capacity Data device. 3. The electric double layer capacitor according to claim 1, wherein the plurality of electric double layer capacitors are laminated with a conductive plate disposed along the electrode plate between the capacitors with the separator interposed therebetween. The united current collector is connected to one end of the conductive plate, and the united current collector of a different pole of another adjacent electric double layer capacitor is connected to the other end of the conductive plate. 3. The capacitor device according to claim 2, wherein: 4. The bound current collecting member of one electric double layer capacitor is connected to the bound current collecting member of a different pole of another adjacent electric double layer capacitor in a direction parallel to the electrode plate. 3. The capacitor device according to claim 2, wherein the capacitor device is connected to the plate on the same side. 5. The device according to claim 4, wherein the bound current collecting member is connected to a conductive plate disposed along the electrode plate via the separator between the capacitors. Capacitor device. 6. The electric double layer capacitor is housed in a non-conductive case member having a tubular shape and having upper and lower open ends, with the case member surrounding a side surface parallel to the lamination direction of the electrode plates. 3. The capacitor device according to claim 2, wherein the case members are stacked via the conductive plate, and the stacked case members are connected to each other while sandwiching the conductive plate. 7. The non-conductive case member is provided with a rib along the opening end, and provided along the opening end of one case member when laminated via the conductive plate. 7. The capacitor device according to claim 6, wherein the provided rib and a rib provided along the opening end of another adjacent case member are held together by being sandwiched by a clip member. . 8. The capacitor device according to claim 6, further comprising a non-conductive closing member that closes the open end of the stacked case members via the conductive plate. 9. The capacitor device according to claim 8, wherein the lid member includes a socket portion and a terminal provided in the socket portion and connected to the conductive plate. 10. The lid member is provided with a rib along an outer edge thereof, and when closing an end of the case member via the conductive plate, the rib and the rib of the adjacent case member are closed. 9. The capacitor device according to claim 8, wherein a rib provided along the opening end is coupled to each other by being sandwiched by a clip member. 11. The non-conductive case member has an introduction hole for introducing an electrolyte solution impregnated in the separator, and the introduction hole is closed by a closing member after the introduction of the electrolyte solution. The capacitor device according to claim 6. 12. An electric double layer capacitor, comprising: a conductive case member having a cylindrical shape and having upper and lower open ends; and a conductive plate formed integrally with the case member so as to cross the inside of the case member. In the space defined by the above, the conductive plate is sandwiched and the case member surrounds and accommodates the side surface parallel to the lamination direction of the electrode plates, and the case member is disposed between the case members. 3. The capacitor device according to claim 2, wherein the laminated case members are connected to each other via a laminated insulating member. 13. The conductive case member is provided with a rib along the opening end, and is provided along the opening end of one case member when laminated via the insulating member. 13. The rib according to claim 12, wherein the rib and the rib provided along the opening end of another adjacent case member are sandwiched by an insulating clip member. Capacitor device. 14. The conductive case member has an introduction hole for introducing an electrolyte solution impregnated in the separator,
13. The capacitor device according to claim 12, wherein the introduction hole is closed by a closing member after the introduction of the electrolyte solution.