JP2002252146A - Electric double-layer capacitor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric double-layer capacitor, whose electrical properties can be controlled freely so as to solve the problem in which a conventional electric double-layer capacitor is low in productivity and expensive, because the separators need to be different from each other in pore diameter, and porosity are used so as to change the electric double-layer capacitor in electrical properties. SOLUTION: This electric double-layer capacitor cell has a structure, in which a film part, having no pore or a film part having micro pores, is provided to a part of a porous film separator so as to freely regulate the separator in permeability to ions contained in an electrolyte, and to regulate the porous film separator in pore diameter and porosity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a porous membrane separator by controlling the pore size and porosity involved in the permeation characteristics of ions in the electrolyte between the positive electrode and the negative electrode and the separation characteristics of electrode particles. It controls the electrical characteristics of the double-layer capacitor freely.

[0002]

2. Description of the Related Art Conventionally, this type of electric double layer capacitor cell 1 (hereinafter referred to as a basic cell) has been configured as shown in FIG. That is, the porous membrane separator 2 (hereinafter, referred to as a separator) needs to separate the fine particles of the plus electrode 5 and the minus electrode 6 (prevent short circuit) and allow ions in the electrolyte to pass therethrough. It was small and had a uniform and homogeneous porosity.

Further, the electric double layer capacitor 7 controls the permeation characteristics of ions in the electrolytic solution by using the separators 7 having different pore diameters and porosity of the separator 2, thereby improving the electric characteristics of the electric double layer capacitor 7. I was in control.

[0004]

In the conventional basic cell 1 as shown in FIG. 4, the permeability of ions in the electrolyte and the separation of electrode particles are highly dependent on the pore size and porosity of the separator 2, In order to change the characteristics, it was necessary to arrange a plurality of separators 2 having different pore diameters and porosity.

Further, it is very difficult for the conventional separator 2 to make the pore size small and uniform, and to keep the porosity low and uniform, so that the productivity is poor and the added value is high.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned conventional problems, and its structural features are shown by way of example in FIGS. 5, 6, 7, and 8. FIG. An embodiment of the present invention will be described with reference to a perspective cross-sectional view of an electric double layer capacitor cell.

In the separator 2 of the present invention shown in FIGS. 5, 6, 7 and 8, a nonporous membrane portion or a microporous membrane portion 9 is artificially formed in a part of the above-mentioned uniform and homogeneous separator 2. The pore diameter and the porosity, which are the basic physical properties of the separator 2, can be freely changed.

Further, the separator 2 can freely control the electric characteristics of the electric double layer capacitor 7 by controlling the ions in the electrolytic solution.

The formation of the nonporous membrane portion and the microporous membrane portion 9 can be easily realized by heat or pressure.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1, 2, 3, 4, 5, 6, 7, and 8. FIG.

FIG. 1 is a perspective sectional view of an electric double layer capacitor 7 for explaining an embodiment of the present invention. FIG. 2 is a sectional view of an electric double layer capacitor element of the electric double layer capacitor 7 shown in FIG. FIG. 3 is a sectional view of the basic cell 1.

FIG. 4 is a perspective cross-sectional view of a basic cell 1 showing a conventional example.

FIG. 5 is a perspective cross-sectional view of the basic cell 1 showing the first embodiment of the present invention.

6, 7 and 8 are perspective cross-sectional views of a basic cell 1 showing an embodiment of the present invention.

Next, Embodiments 1 to 5 of the present invention will be described with reference to FIGS. 5, 6, 7, and 8. FIG.

In the first embodiment of the present invention shown in FIG. 5, a nonporous membrane portion or a microporous membrane portion 9 is arranged at the center of the separator 2.

In a second embodiment of the present invention shown in FIG. 6, a nonporous membrane portion or a microporous membrane portion 9 is arranged on a separator 2 with regularity.

In a third embodiment of the present invention shown in FIG. 7, a nonporous membrane portion or a microporous membrane portion 9 is arranged on the outer periphery of the separator 2.

Embodiment 4 of the present invention shown in FIG. 8 has a structure in which a microporous membrane portion 9 is arranged on the entire surface of the separator 2.

[0020]

As described above, according to the separator 2 shown in FIGS. 5, 6, 7 and 8 of the present invention, the pore diameter and porosity of the non-porous film portion or microporous film portion 9 are reduced. Can be freely controlled by the area ratio of the separator 2, and solves the problems of the conventional pore diameter and porosity of the separator 2.

Further, the basic cell 1 of the present invention has a function of arranging a nonporous membrane portion or a microporous membrane portion 9 on the separator 2 to control the permeation characteristics of ions in the electrolyte and the separation characteristics of particles. As shown in Table 1, Table 2, the electric characteristics of the electric double layer capacitor 7 can be controlled.

[Table 1]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a perspective sectional view of an electric double layer capacitor.

FIG. 2 is a sectional view of an electric double layer capacitor element.

FIG. 3 is a sectional view of an electric double layer capacitor cell.

FIG. 4 is a perspective cross-sectional view of an electric double layer capacitor cell showing a conventional example.

FIG. 5 is a perspective cross-sectional view of an electric double-layer capacitor cell showing Embodiment 1 of the present invention.

FIG. 6 is a perspective cross-sectional view of an electric double layer capacitor cell showing a second embodiment of the present invention.

FIG. 7 is a perspective cross-sectional view of an electric double layer capacitor cell showing Embodiment 3 of the present invention.

FIG. 8 is a perspective cross-sectional view of an electric double layer capacitor cell showing Embodiment 4 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric double layer capacitor cell (basic cell) 2 Porous membrane separator (separator) 3 Current collector 4 Gasket 5 Positive electrode 6 Negative electrode 7 Electric double layer capacitor 8 Electric double layer capacitor element 9 Nonporous membrane part or microporous membrane part

Claims (1)

[Claims] 1. A method of forming a nonporous membrane portion or a microporous membrane portion on a porous membrane separator itself of an electric double-layer capacitor cell to change a pore diameter and a porosity, thereby causing ions in an electrolyte between a plus electrode and a minus electrode to change. Electric double layer capacitor that controls the electrical characteristics freely by controlling the transmission characteristics and separation characteristics of electrode particles.