JPH0519971B2 - - Google Patents

Abstract

PURPOSE:To inhibit a dimensional change in a combined sheet previous and subsequent to vulcanizing and the bulges of the side surfaces of a laminated material due to a pressure at the time of caulking and sealing holes by a method wherein a reinforcing material consisting of metal wires or metal fibers molded reticulately and an unvulcanized rubber sheet having an electronic conductivity are put on the combined sheet previous to vulcanizing and are vulcanized together. CONSTITUTION:A reinforcing material 8 consisting of nickel wires or so on molded reticulately is put on a combined sheet 13 formed and moreover, a conductive unvulcanized rubber sheet 12 having an electronic conductivity is put on the material 8. Sheets obtained in such a way are laminated while Al plates are each interposed between the sheets and are fixed as they are applied pressures from the upper and lower directions to perform the covulcanizing adhesion of an unvulcanized rubber sheet part. Thereby, a dimensional change in the sheet 13 during vulcanizing can be inhibited and moreover, the bulges to the lateral direction of the laminated material, which are caused by a pressure at the time of caulking and sealing holes, can be made small by the material 8.

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 particularly to a method for manufacturing an electric double layer capacitor that makes it possible to suppress dimensional changes in a combined sheet and suppress bulges on the sides of a laminate. [Prior Art] In general, an electric double layer capacitor is made by stacking multiple electric double layer capacitor elements (hereinafter referred to as basic cells) having the structure shown in FIG. Stored and formed. In FIG. 4, which is an example of the structure of a basic cell, numeral 7 is an electronically conductive and ion-impermeable conductive separator;
0 is a carbon paste electrode made of powdered activated carbon and an electrolyte solution, 6 is a non-conductive gasket provided to hold the carbon paste electrode 10 and shield it from the outside world, and 9 is the carbon paste electrode 1
This is a porous separator that is ion-permeable and non-electronic conductive and is formed to prevent short circuits between 0 and 10. Furthermore, the electric double layer capacitor is formed by laminating the necessary number of basic cells 14 shown in FIG. 4 in accordance with the voltage used to form the structure shown in FIG. 5. In the figure, reference numeral 4 denotes an insulating case for preventing a short circuit between the side surface of the basic cell 14 and the outer case 5, and 1 denotes a first insulating case with lead terminals protruding from a metal disk in a raised shape.
and the second electrode plate 5 is a metal exterior case. The electric double layer capacitor is manufactured by applying pressure of 1 to 100 kg/cm ² from above and below to the laminate 14a of the basic cell 14 in order to reduce contact resistance etc. within the carbon paste electrode 10, and while maintaining this pressure, the outer case 5
The open end is bent inward and caulked closed. Conventionally, in order to manufacture the basic cell 14 shown in FIG. 4, first a non-electronically conductive unvulcanized rubber sheet 1 having a plurality of holes is prepared as shown in FIGS.
A carbon paste electrode 10 made of powdered activated carbon and an electrolyte solution is filled in a recess 11a formed by pressing an electronically conductive unvulcanized rubber sheet 12 onto the lower surface of the electrode 1, and a pair of carbon paste electrodes 10 are made of a non-electronically conductive Then, they are combined via the ion-permeable porous separator 9 as shown in FIG. 6c to form a combined sheet 15. Next, the combined sheets 15 were stacked with an aluminum plate (not shown) interposed between them, and a pressure of 4 kg/cm ² was applied in the vertical direction, and in this state, the temperature was set in a thermostatic chamber at a temperature of 125 ± 5°C. The electronically conductive and non-electronically conductive unvulcanized rubber sheets were co-vulcanized and bonded by leaving the rubber sheets for 3 hours. In this way, the basic cell 14 is obtained by punching out the combined sheet (not shown) that has been covulcanized and bonded using a ring-shaped punching blade. [Problems to be Solved by the Invention] In the conventional vulcanization process described above, in order to prevent punching misalignment during basic cell punching, dimensional changes due to shrinkage of the combined sheet during vulcanization are kept within a certain range. However, there was a drawback that the storage environment of the rubber sheet and the temperature and time during vulcanization had to be carefully controlled. An object of the present invention is to provide a method for manufacturing an electric double layer capacitor that can suppress dimensional changes before and after vulcanization of a combined sheet, and can also suppress bulges on the sides of a laminate. [Means for solving the problems] The method for manufacturing an electric double layer capacitor of the present invention includes:
A carbon paste electrode made of powdered activated carbon and an electrolyte solution is filled into the recesses formed by pressing an electronically conductive unvulcanized rubber sheet with multiple holes onto an electronically conductive unvulcanized rubber sheet. A pair of upper and lower carbon paste electrode-filled sheets are combined through a non-electron-conductive and ion-permeable porous separator, and the combined sheet is heated under pressure to make it electronically conductive and non-electronically conductive. In the step of co-vulcanizing and adhering unvulcanized rubber sheets, a reinforcing material made of metal wires or fibers formed into a mesh is placed on top of the combined sheet, and an electronically conductive unvulcanized rubber sheet is placed on top of the reinforcement material. The feature is that the adhesive is co-vulcanized and bonded with the adhesive. [Example] Next, an example of the present invention will be described with reference to the drawings. 1 and 2 are cross-sectional views of an electric double layer capacitor manufactured according to the present invention and a basic cell constituting the capacitor, and FIGS. 3 a to 3 d are shown in the order of steps to explain an embodiment of the present invention. FIG. 2 is a sectional view of a combined sheet of an electric double layer capacitor basic cell. First, as shown in FIG. 3 a, b, and c, on the combined sheet 13 formed in the same manner as in the conventional example,
As shown in the figure, a reinforcing material 8 made of nickel wire or the like with a diameter of about 0.3 mm is placed on top of the reinforcing material 8, and an electronically conductive unvulcanized rubber sheet 12 is placed on top of the reinforcing material 8. , stacked with aluminum plates (not shown) inserted between them, and fixed while applying pressure of 4 kg/cm ² from above and below to 125±5
The unvulcanized rubber sheet portions were covulcanized and bonded by leaving them in an atmosphere at .degree. C. for 3 hours. The average value of the dimensional change of the combined sheets before and after vulcanization of the 100 vulcanized combined sheets obtained in this way according to the embodiment of the present invention and the 100 vulcanized combined sheets obtained by the conventional manufacturing method is The results were as shown in Table 1. As can be seen from Table 1, the combined sheet 13 according to one embodiment of the present invention has a reinforcing material 8
As a result, the dimensional change of the combined sheet 13 during vulcanization can be suppressed to about 1/50.

〔Effect of the invention〕

As explained above, in the present invention, a reinforcing material made of metal wires or fibers formed into a mesh shape and an electronically conductive unvulcanized rubber sheet are placed on a combined sheet before vulcanization, and then vulcanized together. By doing so, it is possible to suppress dimensional changes in the combined sheet before and after vulcanization, and it is also possible to suppress bulging of the side surfaces of the laminate due to pressure during crimping and sealing.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric double layer capacitor formed according to an embodiment of the present invention, and FIG. 2 is a cross section of a basic cell of the electric double layer capacitor formed according to an embodiment of the present invention shown in FIG. Fig. 3 a-d
4 is a sectional view of a combined sheet of an electric double layer capacitor shown in the order of steps to explain an embodiment of the present invention, FIG. 4 is a sectional view of a basic cell of a conventional example, and FIG. 5 is an electric double layer of a conventional example. Cross-sectional view of capacitor, No. 6
Figures a to c are cross-sectional views of a combined sheet shown in the order of steps to explain a conventional example. DESCRIPTION OF SYMBOLS 1... First and second electrode plates, 2... Basic cell of the example of the present invention, 3, 14a... Laminated body, 4... Insulating case, 5... Exterior case, 6... Non-conductive gasket, 7... Conductive separator, 8... Reinforcing material, 9... Porous separator, 10... Carbon paste electrode, 11... Non-conductive unvulcanized rubber sheet, 11a... Non-conductive unvulcanized rubber sheet hole,
12... Conductive unvulcanized rubber sheet, 13, 15...
...Combined sheet, 14...Basic cell of conventional example.

Claims (1)

[Claims] 1 A carbon paste electrode made of powdered activated carbon and an electrolyte solution is filled into the recesses formed by pressing a non-electron-conductive unvulcanized rubber sheet with multiple holes onto an electron-conductive unvulcanized rubber sheet. Then, the combined sheet, which is a pair of upper and lower carbon paste electrode filling sheets combined through a non-electron conductive and ion-permeable porous separator, is heated under pressure to make it conductive and non-electron conductive. In the process of co-vulcanizing and adhering unvulcanized rubber sheets,
A reinforcing material made of metal wires or fibers formed into a mesh shape is placed on the combined sheet, and an electronically conductive unvulcanized rubber sheet is further placed on the reinforcing material to perform co-vulcanization adhesion. A method for manufacturing an electric double layer capacitor.