JPH1097959A - Electric double layer capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformly inject an electrolytic solution into basic cells provided in the capacitor main body of an electric double layer capacitor. SOLUTION: The capacitor main body 15 of an electric double layer capacitor has an inlet 16 for injecting an electrolytic solution 23 into basic cells set in a plurality of frame-like gaskets laminated in parallel with each other through the inlets of the gaskets. The inlet 16 has a wide opening area surrounding the inlets of all gaskets. The solution 23 is injected into the basic cells by dispersedly supplying the solution 23 to the inlets of the gaskets from the inlet 16 of the main body 15 by setting the main body 15 in a vacuum vessel 17 with the inlet 16 on the downside and evacuating the vessel 17 to a vacuum, and then, injecting the solution 23 into the evacuated vessel 17 until the inlet 16 of the main body 16 is submerged in the solution 23.

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 more particularly to a structure and a manufacturing method of a multilayer electric double layer capacitor.

[0002]

2. Description of the Related Art Generally, a secondary battery represented by a lead storage battery or a nickel-cadmium battery is used as an element for storing electricity. Although these secondary batteries have a high energy density, their charging and discharging involve chemical reactions,
It is difficult to charge and discharge in a short time.

As a supplement to this drawback, for example, Katsu et al. Described in a paper entitled "Development and Application of Electric Double Layer Capacitor for Power" on page 87 of NEC Technical Report, October 1995. There is a large-capacity multilayer electric double layer capacitor. The electric double layer capacitor has an excellent characteristic that charging and discharging can be performed in a unit of second with a large current without a chemical reaction in charging and discharging.

FIG. 7 is a sectional view showing the structure of a multilayer electric double layer capacitor. Two solid activated carbons 3 are separated by a separator 4 in a space formed by a frame-shaped gasket 1 and two current collectors 2 facing each other, and a plurality of basic cells in which an electrolyte is sealed are stacked in series. The pressure plate 8 is pressed from both sides by a pressure plate 8 via a positive electrode plate 5, a negative electrode plate 6, and a buffer material 7 for uniformly pressing, and after the electrolyte is injected from the electrolyte injection hole 9, the electrolyte injection hole is formed. 9 is welded and sealed.

[0005]

However, in the above-mentioned conventional multilayer electric double-layer capacitor, tubular nozzles are formed in all the injection holes 9 provided on the side surfaces of the frame-shaped gasket 1 in which the respective layers are stacked to form a laminated structure. Is inserted and the inside is evacuated, and then the electrolyte is injected.

According to this method, since the injection hole 9 is small, the diameter of the nozzle is also small, and it is difficult to uniformly evacuate the inside of all the gaskets 1 to inject the electrolytic solution. In some cases, it was incomplete and did not exhibit the desired performance. Further, in order to improve the performance of the electric double layer capacitor, it is necessary to reduce the thickness of each gasket 1, and there has been a problem that the injection of the electrolyte becomes more difficult.

An object of the present invention is to provide an electric double layer capacitor capable of uniformly injecting an electrolytic solution into a basic cell of each gasket and exhibiting stable performance, and a method of manufacturing the same.

[0008]

In order to achieve the above object, an electric double layer capacitor according to the present invention is an electric double layer capacitor having a capacitor main body, wherein the capacitor main body has a plurality of frame-like layers stacked in parallel. Each of the basic cells is installed in a gasket, and the basic cells are stacked in series via a current collector. In each of the basic cells, an electrolyte is injected through an injection hole of the gasket. The gas inlet has a wide opening area surrounding the entire gas hole of the plurality of gaskets, and the gas holes of the gaskets communicate in parallel.

The wide inlet is formed by abutting panel materials formed around the injection hole of the gasket to form an elongated hole.

The panel member is provided so as to be removable.

The wide inlet has an internal volume larger than the amount of electrolyte injected into the capacitor body.

Further, the method of manufacturing an electric double layer capacitor according to the present invention is a method of manufacturing an electric double layer capacitor in which a vacuum cell is subjected to a vacuum decompression process and an injection process, and an electrolytic solution is filled in a basic cell of the capacitor body. The capacitor body is one in which the electrolyte is injected through the injection hole of the gasket into each of the basic cells installed in a plurality of frame-shaped gaskets stacked in parallel, and has an injection port. The gasket has a wide opening area surrounding the entire gasket injection hole, and the gasket injection holes communicate with each other in parallel. Is placed in a vacuum vessel, and the vacuum is reduced in the vacuum vessel. Input, and by returning the vacuum container to atmospheric pressure, the electrolyte solution a process of injection from the injection port of the capacitor body in the dispersion supplied to the basic cells in the injection hole of the gasket.

[0013] A method of manufacturing an electric double layer capacitor in which a filling process, a vacuum decompression process, and an injection process are performed to fill an electrolytic solution into a basic cell of the capacitor body, wherein the capacitor bodies are stacked in parallel. The electrolyte is injected into each basic cell installed in the plurality of frame-shaped gaskets through the injection hole of the gasket, and has an injection port, and the injection port covers the entire injection hole of the plurality of gaskets. Surround,
In addition, the injection holes of each gasket communicate in parallel, and the internal volume thereof is larger than the amount of the electrolyte to be injected into the capacitor body, and the filling process is a process of filling the electrolyte into the inlet of the capacitor body. The vacuum decompression process is a process of installing a capacitor body filled with an electrolyte solution into an inlet in a vacuum container, and depressurizing the inside of the vacuum container.The injection process is performed by returning the inside of the vacuum container to atmospheric pressure. This is a process of dispersing and supplying the electrolyte solution in the injection port to the injection hole of each gasket.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded perspective view showing an electric double layer capacitor according to an embodiment of the present invention.
FIG. 2 is a perspective view showing an assembled state of the electric double layer capacitor according to the embodiment of the present invention.

As shown in the figure, the electric double layer capacitor according to the embodiment of the present invention has a capacitor body 15, and the capacitor body 15 is provided in a plurality of frame-shaped gaskets 1, 11 stacked in parallel. Set up each basic cell,
It has a structure in which basic cells are stacked in series via a current collector 2, and an electrolytic solution is injected into the basic cells through the injection holes 9 of the gasket 1. The gaskets 1 and 11 are made of an insulating material, and are specifically formed in a frame shape using a resin.

The basic cell comprises a solid activated carbon 3 and a separator 4 made of glass fiber or the like for insulating adjacent solid activated carbons 3 from each other.
It consists of a combination with In the drawing, the positive electrode plate 5, the negative electrode plate 6, the cushioning material 7, and the pressure plate 8 disposed at both ends of the capacitor body 15 are not shown.

Panel members 10 and 10 are formed on the gasket 1 so as to surround the injection hole 9, and as shown in FIG. An elongated hole-shaped wide inlet 16 is formed. The wide inlet 16 has an opening area surrounding the entire inlet 9 of the plurality of gaskets 1.
The injection port 9 of each gasket 1 communicates with the wide injection port 16 in parallel.

The gaskets 1 and 2 of the capacitor body 15
Gaskets 11, 11 located at both ends of 11
The panel member 12 is formed so as to stand up in a different direction from the other panel members 10, and the panel member 12 provided on the gaskets 11, 11 has a plurality of gaskets 1, 1 sandwiched between the gaskets 11, 11. , 1,... Are closed at the side openings of the long hole-shaped injection port 16 formed by abutting the panel materials 10.

FIG. 2 is a perspective view showing a state where the electric double layer capacitor shown in FIG. 1 is assembled. In the electric double layer capacitor according to the embodiment of the present invention, basic cells are respectively installed in a plurality of frame-shaped gaskets 1, 1, ... stacked in parallel, and the basic cells are connected via the current collector 2 to each other. A plurality of frame-shaped gaskets 1, 1, 1 stacked in series and stacked in parallel
The gaskets 11, 11 are applied to both ends of... In this case, gasket 1,
Numerals 11 are integrally joined by using an adhesive or the like to liquid-tightly seal each other. Further, the panel materials 10 of the adjacent gaskets 1 stacked in parallel are abutted against each other, and a slot-shaped injection port 16 is formed.
And the side opening of the injection port 16 is
It is closed by 12. In this case, a slot-shaped injection port 16 is provided.
Are formed so as to rise from the capacitor body 15 so as to surround the entire injection holes 9 of the plurality of gaskets 1.

As shown in FIG. 3A, the panel members 10 and 12 provided on the gaskets 1 and 11 have V-shaped cuts 13 at their roots.

Then, an electrolyte is injected by a method described later,
After sealing the injection hole 9 of each gasket 1 with the stopper 14,
The panel material 10 and the panel material 12 are cut and removed from the cut 13. Therefore, after the panel members 10 and 12 are removed, there is no portion protruding from the capacitor body 15, and the shape and dimensions are completely the same as those of the conventional electric double layer capacitor.

Further, as shown in FIG.
Injection port 1 having a long hole formed by the combination of
6 may be configured such that its internal volume is set to be larger than the amount of the electrolyte to be injected into the capacitor body 15 to simplify the operation of injecting the electrolyte.

Next, using the method for manufacturing an electric double layer capacitor according to the embodiment of the present invention, the step of injecting the electrolyte is shown in FIG.
This will be described below.

As shown in FIG. 2, the condenser body 15 is set in a vacuum vessel 17 with the inlet 16 of the assembled condenser body 15 facing downward. Here, the vacuum container 17
A vacuum pump 19 is connected via a vacuum valve 18, connected to the outside via an opening valve 20, and connected to an electrolyte tank 22 via an electrolyte valve 21.

When the electrolyte is injected, the vacuum pump 19 is operated with the opening valve 20 and the electrolyte valve 21 closed, and the vacuum valve 18 is opened to reduce the pressure inside the vacuum vessel 17 to a vacuum (vacuum pressure reduction processing). ). At this time, since the liquid injection hole 9 of the condenser main body 15 is open, the inside of the condenser main body 15 is similarly evacuated.

After the inside of the vacuum vessel 17 reaches a predetermined degree of vacuum, the vacuum valve 18 is closed, the electrolyte valve 21 is opened, and the electrolyte tank 22 is placed in the vacuum vessel 17 under reduced pressure.
3 is injected to a depth at which the injection port 16 of the capacitor body 15 is immersed. The electrolyte valve 21 is closed when the electrolyte 23 is injected to a depth at which the injection port 16 is immersed. After that, release valve 2
0, the inside of the vacuum vessel 17 is returned to the atmospheric pressure, and the vacuum vessel 1 is opened.
By utilizing the vacuum pressure in 7, the electrolytic solution 23 is dispersedly supplied from the inlet 16 of the capacitor body 15 to the inlet 9 of the gasket 1 and filled in the basic cell (injection process).

At this time, the liquid level of the electrolytic solution 23 in the vacuum vessel 17 is limited to a level that does not make contact with the gaskets 1 and 11 of the capacitor body 15, so that the electrolytic solution 23
Only the injection port 16 is in contact with the liquid surface of the electric double layer capacitor, and the metal component of the electric double layer capacitor is not oxidized or corroded by the corrosive electrolytic solution 23. The capacitor body 15 into which the electrolytic solution 23 has been injected is taken out of the vacuum vessel 17 and
The injection hole 9 of each gasket 1 is fused and sealed with a stopper 14. After removing the panel members 10 and 12, the capacitor body 15
There is no portion protruding from the capacitor, and the shape and dimensions are exactly the same as those of the conventional electric double layer capacitor.

Next, a process of injecting an electrolytic solution using the capacitor body 15 shown in FIG. 4 will be described with reference to FIG.

As shown in FIG. 4, the condenser body 15 is set in a vacuum vessel 17 with the inlet 16 of the assembled capacitor body 15 facing upward, and the electrolyte 16 is filled in the inlet 16 (filling process). .

Next, the vacuum pump 19 is operated with the opening valve 20 closed, and the vacuum valve 18 is opened to reduce the pressure inside the vacuum vessel 17 to a vacuum (vacuum pressure reduction processing). At this time, the air contained in the inside of the capacitor body 15 is discharged as bubbles in the electrolytic solution 23 through the injection hole 9 of each gasket 1, and the inside of the capacitor body 15 is the same as the inside of the vacuum vessel 17. Pressure.

After the inside of the vacuum vessel 17 reaches a predetermined degree of vacuum, the vacuum valve 18 is closed, the opening valve 20 is opened to return the inside of the vacuum vessel 17 to atmospheric pressure, and the vacuum pressure in the vacuum vessel 17 is used. As a result, the electrolytic solution 23 is dispersed and supplied from the inlet 16 of the capacitor body 15 to the inlet 9 of the gasket 1 and filled in the basic cell (injection process). Panel materials 10, 12
Is removed, the portion protruding from the capacitor body 15 is eliminated, and the shape and dimensions are exactly the same as those of the conventional electric double layer capacitor.

According to the method shown in FIG. 6, the amount of the electrolyte to be injected only needs to be the internal volume of the injection port 16, and the amount of the electrolyte can be reduced as much as possible. Further, by providing an observation window in the vacuum container 17, there is an advantage that the injection state of the electrolyte can be visually observed.

[0033]

As described above, according to the present invention, the injection of the electrolytic solution can be performed reliably and in a short time, and the performance of the electric double layer capacitor can be stabilized and the manufacturing process can be simplified. it can.

The injection port provided in the capacitor body is
The panel material formed by standing up around the injection hole of the gasket is formed into a long hole shape by abutting, and its structure is taken into consideration at the time of design. It can be realized without adding.

The panel material of the capacitor main body is provided so as to be removable. After the panel material is removed, there is no portion protruding from the capacitor main body, and the same shape as the conventional electric double layer capacitor is obtained. Dimensions
There is no problem caused by providing the inlet.

The wide inlet has an internal volume set to be larger than the amount of the electrolyte to be injected into the capacitor body, so that the amount of the electrolyte to be injected is limited to the internal volume of the inlet. The liquid volume can be minimized.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an electric double layer capacitor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a state where the electric double layer capacitor shown in FIG. 1 is assembled and an injection port is formed.

FIG. 3A is a cross-sectional view showing a state in which a cut is provided in a panel material of a gasket used for an electric double layer capacitor according to an embodiment of the present invention, and FIG. It is sectional drawing which shows the state which cut and removed the material.

FIG. 4 is a cross-sectional view showing an electric double-layer capacitor according to an embodiment of the present invention, in which an inner volume of an inlet formed in a conductor main body is larger than an amount of an injected electrolyte.

FIG. 5 is a cross-sectional view illustrating a method for manufacturing an electric double layer capacitor according to one embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating a method for manufacturing an electric double layer capacitor according to another embodiment of the present invention.

FIG. 7 is a sectional view showing a structure of an electric double layer capacitor according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Gasket 2 Current collector 3 Solid activated carbon 4 Separator 5 Positive electrode plate 6 Negative electrode plate 7 Buffer material 8 Pressurizing plate 9 Injection hole 10, 12 Panel material 13 Cut 14 Plug 15 Capacitor main body 16 Inlet 17 Vacuum container 18 Vacuum valve 19 Vacuum pump 20 Release valve 21 Electrolyte valve 22 Electrolyte tank 23 Electrolyte

Claims (6)

[Claims] 1. An electric double layer capacitor having a capacitor body, wherein the capacitor body has basic cells installed in a plurality of frame-shaped gaskets stacked in parallel, and connects the basic cells via a current collector. It has a structure of being stacked in series, in which an electrolyte is injected into each basic cell through an injection hole of a gasket, and has an injection port. An electric double-layer capacitor having a wide opening area surrounding the gasket, wherein injection holes of each gasket communicate in parallel. 2. The wide-mouthed injection port is formed by abutting a panel material formed by surrounding the injection hole of the gasket and rising to form an elongated hole.
3. The electric double layer capacitor according to claim 1. 3. The electric double layer capacitor according to claim 1, wherein the panel material is provided so as to be removable. 4. The electric double-layer capacitor according to claim 1, wherein the wide inlet has an internal volume larger than an amount of an electrolyte to be injected into the capacitor body. 5. A method for producing an electric double layer capacitor, comprising performing vacuum decompression treatment and injection treatment to fill an electrolytic solution in a basic cell of a capacitor body, wherein the capacitor body includes a plurality of parallel stacked layers. The electrolyte is injected into each basic cell installed in the frame-shaped gasket through the injection hole of the gasket, has an injection hole, the injection hole surrounds the entire injection hole of the plurality of gaskets, and The injection hole of each gasket has a wide opening area that communicates in parallel, and the vacuum decompression treatment places the capacitor body in a vacuum container with the injection port of the capacitor body facing downward, and cleans the inside of the vacuum container. The injection process is performed by injecting the electrolytic solution into the vacuum container that has been decompressed in vacuum to a depth at which the inlet of the capacitor body can be immersed, and returning the vacuum container to atmospheric pressure. Method for producing an electric double layer capacitor characterized in that the liquid which is the process of injecting the injection port of the capacitor body in the dispersion supplied to the basic cells in the injection hole of the gasket. 6. A method for producing an electric double layer capacitor, comprising: performing a filling process, a vacuum decompression process, and an injection process, and filling an electrolyte in a basic cell of the capacitor body, wherein the capacitor bodies are stacked in parallel. The electrolyte is injected into each of the basic cells installed in the plurality of frame-shaped gaskets through the injection hole of the gasket, and has an injection hole. , And the injection holes of each gasket communicate in parallel, and the internal volume is larger than the amount of electrolyte injected into the capacitor body, and the filling process fills the electrolyte into the injection hole of the capacitor body. The vacuum depressurization process is a process in which a capacitor body filled with an electrolyte at an inlet is placed in a vacuum container and the inside of the vacuum container is depressurized in vacuum. By returning the pressure, method of manufacturing an electric double layer capacitor characterized in that the electrolyte injection mouth is distributed for supplying the process to the injection holes of each gasket.