JPH0758674B2 - Method for manufacturing electric double layer capacitor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method for manufacturing an electric double layer capacitor, and more specifically, it is possible to impregnate a polarizable electrode of an electric double layer capacitor element with an electrolytic solution in a short time. The present invention relates to such a manufacturing method.

<Prior Art> FIG. 6 shows an electric double layer capacitor element 1 used in the construction of an electric double layer capacitor, in which a pair of polarizable electrodes 3 and 3 facing each other via a separator 2 are housed in a gasket 4. , The polarizable electrodes 3 and 3 are impregnated with the electrolytic solution, and the conductive current collectors 5 and 5 are provided on both surfaces of the gasket 4, respectively.
The gasket 4 is fixed in a state of being in contact with, and the inside of the gasket 4 is hermetically sealed.

As shown in FIGS. 7 and 8, a plurality of electric double layer capacitors using the electric double layer capacitor element 1 are provided.
For example, a structure in which six electric double layer capacitor elements 1 are stacked, housed together with the electrode plates 7 and 8 in the insulating case 6, terminals 9 and 10 are drawn out of the insulating case 6 and sealed with a lid 11 Has become.

By the way, the electric double layer capacitor element 1 used in the above electric double layer capacitor has a structure in which the polarizable electrodes 3, 3 and the separator 2 are impregnated with an electrolytic solution such as dilute sulfuric acid.

Conventionally, the polarizable electrodes 3, 3 of the electric double layer capacitor element 1
In order to impregnate the separator 2 with the electrolytic solution, the polarizable electrodes 3 and 3 facing each other with the separator 2 are inserted into the inside of the gasket 4 having the current collector 5 stretched therebelow, and the upper polarizable electrode 3
An impregnation method has been adopted in which a fixed amount of the electrolytic solution is dropped on the above by using a dispenser or the like and then left in a constant atmosphere to allow the polarizable electrodes 3, 3 and the separator 2 to absorb the electrolytic solution by its own weight.

<Problems to be Solved by the Invention> In general, impurities, a gas, a solvent such as PG, and impure fine particles are often left in the pores of the polarizable electrodes 3 and 3 and the separator 4. In the conventional impregnation method, the dropped electrolytic solution tends to be ball-shaped, it takes time to absorb the polarizable electrode and the separator, the production period becomes long and the equipment cannot be continuous, leading to an increase in product cost. There is a problem.

Further, there is a problem in that the polarizable electrode cannot be completely impregnated with the electrolytic solution and a liquid leakage state occurs.

An object of the present invention is to solve the above problems, so that the impregnation of the polarizable electrode and the separator with the electrolytic solution can be completed completely in a short time, liquid leakage does not occur, and the cost of the product can be reduced. An object of the present invention is to provide a method of manufacturing an electric double layer capacitor that can be used.

<Means for Solving the Problems> In order to solve the above problems, the present invention provides a method of manufacturing an electric double layer capacitor in which a plurality of electric double layer capacitor elements are stacked and housed in an insulating case. That is, a pressing step of inserting a polarizable electrode facing through a separator into a gasket having a current collector stretched at the bottom, and pressing the polarizable electrode onto the polarizable electrode to bring the polarizable electrode and the separator into close contact with each other. After removing impurities, etc., which have clogged the pores of the polarizable electrode and the separator by reducing the pressure, the electrolytic solution is dropped on the upper polarizable electrode to separate the separator and the lower polarizability. It is configured to include an electric double layer capacitor element formed through a step of impregnating an electrode with an electrolytic solution.

<Function> Inserting the polarizable electrodes facing each other through the separator inside the gasket in which the current collector is stretched on the lower surface, pressurizing from above the upper polarizable electrode by a press to bring the polarizable electrode and the separator into close contact, Impurities and the like are removed from the polarizable electrode and the pores of the separator by applying a reduced pressure state.

If the electrolytic solution is dropped on the upper polarizable electrode, the electrolytic solution will quickly penetrate into the polarizable electrode, and the electrolytic solution that has reached the separator will spread due to the capillary phenomenon of the contact portion between the polarizable electrode and the separator, Permeate the lower polarizable electrode through the separator pores.

<Embodiment> An embodiment of the present invention will be described below with reference to FIGS. 1 to 5 of the accompanying drawings.

Since the basic structure of the electric double layer capacitor is substantially the same as that of the conventional example shown in FIGS. 6 to 8, the same parts are designated by the same reference numerals, and the electric double layer capacitor which is the object of the present invention. The method for manufacturing the element will be described in detail.

As shown in FIG. 1, a current collector 5 is stretched on the lower surface side of the gasket 4, and polarizable electrodes 3 and 3 that are attached to both surfaces of the separator 2 and face each other are inserted into the gasket 4. An electric double layer capacitor element subassembly 1a is formed.

In this state, as shown in FIG. 2, pressure is applied from above the upper polarizable electrode 3 by the press 21 to bring the polarizable electrodes 3 and 3 into close contact with the separator 2.

As shown in FIG. 3, the pressure applied by the press 21 in this pressurizing step is such that the central portion of the upper polarizable electrode 3 is slightly recessed, for example, at a pressure of about 10 kg / cm ² and then divided. The carbon black contained in the polar electrodes 3 and 3 is extruded and the adhesive is stretched so as to cause a capillary phenomenon when impregnated with the electrolytic solution.

Next, the electric double layer capacitor element subassembly 1a is put under reduced pressure, for example, by being placed in a vacuum chamber, and the polarizable electrodes 3, 3 are placed.
Then, impurities, gas, solvent such as PG, impure fine particles, etc., clogged in the pores of the separator 2 are sucked and removed to accelerate and stabilize the impregnation speed when the electrolytic solution is dropped.

Either the pressurizing step or the impurity removing step may be performed first.

With respect to the electric double layer capacitor element subassembly 1a which has completed the pressurizing step and the step of removing impurities, as shown in FIG.
Vertical or horizontal vibration is applied to the electric double layer capacitor element subassembly 1a in a state where a predetermined amount of the electrolytic solution A is dropped onto the central concave portion 3a on the upper surface of the upper polarizable electrode 3.

Since the surface of the upper polarizable electrode 3 is the recessed portion 3a in the pressurizing step by the press 21, the electrolytic solution A does not spill, and the Teflon-based binder floats on the surface and is dropped. Even if the electrolytic solution A becomes ball-shaped, it is possible to
As shown in the figure, the electrolytic solution A can be easily spread on the polarizable electrode 3.

By the way, the vibration applied has an amplitude of 0.1 to 2 mm and a cycle of 60 to
120vps is preferable.

When the electrolytic solution A spreads on the polarizable electrode 3, the electric double layer capacitor element subassembly 1a is repeatedly subjected to pressure reduction and leakage at a temperature of 30 to 60 ° C. or at room temperature to polarize the electrolytic solution A. The electrodes 3 and 3 and the separator 2 are impregnated.

The electrolytic solution that has permeated the upper polarizable electrode 3 reaches the separator 2 and spreads to the space between the separator 2 and the polarizable electrode 3 by a capillary phenomenon, which permeates the lower polarizable electrode 3 through the pores of the separator 2. To do.

Impurities and the like have been removed from the polarizable electrodes 3 and 3 and the separator 2 in advance, so that the permeation of the electrolytic solution is smoothed, and the spreading of the electrolytic solution is prevented by applying vibration and repeated depressurization and leakage. It is possible to accelerate and impregnate the whole with the electrolytic solution in a short time.

An electric double layer capacitor as shown in FIG. 6 is obtained by stacking a current collector on the gasket of the electric double layer capacitor element subassembly 1a impregnated with the electrolytic solution as described above, and adhering it under a reduced pressure condition to seal the inside. Element 1 is completed.

A plurality of electric double layer capacitor elements 1 are laminated to form a seventh
As shown in FIG. 8 and FIG. 8, the electric double layer capacitor is formed by accommodating the electrode plates 7 and 8 in the insulating case 6.

<Effects of the Invention> As described above, according to the present invention, when the electric double layer capacitor element of the electric double layer capacitor is impregnated with the electrolytic solution, the polarizable electrode is pressed to bring it into close contact with the separator, and the impurities due to the reduced pressure are added. After the removal of the electrolyte, the electrolytic solution was added dropwise to permeate it, so stable liquid absorption of the polarizable electrode and separator was obtained, and the impregnation time could be greatly shortened, and the production period could be shortened. The cost can be reduced.

By the way, the conventional impregnation time was 40 to 60 minutes, but in the present invention, it can be greatly shortened to about 3 minutes.

Further, by performing a pressing process on the polarizable electrode, there is no horizontal rolling of the dropped electrolytic solution, and the polarizable electrode and the separator can be surely impregnated with the electrolytic solution,
No liquid leakage occurs.

[Brief description of drawings]

1 to 5 are explanatory views showing the steps of manufacturing an electric double layer capacitor element in order, FIG. 6 is a vertical sectional view of the electric double layer capacitor element, and FIG. 7 is an exploded perspective view of the electric double layer capacitor, FIG. 8 is a vertical sectional view of the above. DESCRIPTION OF SYMBOLS 1 ... Electric double layer capacitor element 1a ... Electric double layer capacitor element subassembly 2 ... Separator, 3 ... Polarizable electrode 4 ... Gasket, 5 ... Current collector 6 ... Insulating case, 7, 8 ... Electrode plate 9, 10 ... Terminal, 21 ... Press A ... Electrolyte

Claims (1)

[Claims] 1. A method of manufacturing an electric double layer capacitor in which a plurality of electric double layer capacitor elements are stacked and housed in an insulating case, wherein a separator is provided in a gasket having a current collector stretched below. Insert a polarizable electrode facing each other and pressurize it from above the polarizable electrode to bring the polarizable electrode and the separator into close contact with each other, and depressurize to reduce impurities and the like in the pores of the polarizable electrode and the separator. And an electric double layer capacitor formed through a step of dropping an electrolyte solution on the upper polarizable electrode and impregnating the separator and the lower polarizable electrode with the electrolytic solution after performing a step of removing impurities and the like. A method for manufacturing an electric double layer capacitor, comprising an element.