JPS60219720A - Electric double layer capacitor and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric double layer capacitor and a method of manufacturing the same.

Figure 1 illustrates the basic structure of an electric double layer capacitor, in which electric double layer capacitor elements 1 are stacked one on top of the other in a number corresponding to the desired operating voltage and connected in series. An electrode structure 6 in which an insulating plate 5 is interposed between the upper first electrode plate 3 and the lower second electrode plate 4 is attached to the second electrode plate 4.
stacked so as to be electrically conductive with the uppermost electrode of the laminate 2, and housed in a conductor case 7 that is electrically conductive with the lowermost electrode of the laminate 2.The laminate 2 and the electrode structure 6 are placed under pressure and placed in the conductor case 7. The upper end of 7 is sealed, the first electrode plate 3 and the conductor case 7 are electrically connected, and the electrode terminals 3a, 4a are connected from both electrode plates 3, 4, respectively.
is constructed by drawing out the conductor case 7 to the outside.

The structure of the element 1 used in the above electric double layer capacitor is as follows.
As shown in the figure, a pair of carbon electrodes 12.13 mainly made of activated carbon and an electrolyte solution such as an aqueous sulfuric acid solution are provided on both sides of the porous separator 11, which is ion permeable and non-electron conductive. It is surrounded by a side wall 14 made of an electrically insulating elastic material such as rubber, and both electrodes 12 and 13 are stacked with a top plate 15 and a bottom plate 16 made of a conductor such as conductive rubber that is resistant to electrolyte solutions. The top plate 15 and bottom plate 16 serve as the electrodes of the element 1, and are formed into a large capacity capacitor by utilizing the electric two-layer phenomenon that occurs at the interface between the activated carbon and the electrolyte solution.

In order to obtain a capacitor with an IS withstand voltage using electric double layer capacitor elements such as those described above, as shown in Fig. 1, a plurality of elements 1 are stacked one on top of the other, and a casing is made so that each electrode is in close contact with each other. .

In addition, even if the electric double layer capacitor d3 as described above is a self-standing type similar to other electrical parts, it is preferable to adopt a structure in which both electrode terminals 3a and 4a are located on one end surface of the conductor case 7. This is preferable in terms of mounting, wiring, etc.

Therefore, as shown in FIG.
By combining the electrode plate 4 and the insulating plate 5 that insulates them, and pulling out both electrode terminals 3a and 4a in the same direction to form an electrode structure 6, and attaching this electrode structure on top of the laminate 2, a self-supporting structure can be formed. Construction of electric double layer capacitors has been carried out.

By the way, when using stacked electric double layer capacitor elements, in order to reduce the contact resistance or internal resistance between the activated carbon particles constituting the carbon electrodes 12 and 13 and between the elements, as described above, 1 to laminate 2
It is necessary to apply a pressure of 9<7 to ~100 and use it while maintaining this pressure, and this pressure is applied to the 11th! of the electrode structure 6 stacked on top! It will be applied from above the electrode plate 3.

However, the conventional laminate 2 simply stacks the elements 1 one above the other, and in order to prevent the elements 1 from contacting the conductor case 7 and short-circuiting, tape is wrapped around the outer circumferential surface of each element 1, or as shown in FIG. Since the insulating case 8 for housing the laminate 2 has been provided below the outer periphery of the insulating plate 5, the following problem arises:

+1) Since the elements are individually separated, it is inconvenient to handle them when stored in a conductor case, and it is difficult to automate condenser production.

(If an insulating case is provided to prevent the occurrence of a short circuit between the element and the 1117-unit case, the overall shape will become larger.

1) Positional deviation occurs between elements when the laminated body is under In+ pressure,
Unable to apply pressure evenly to each element, local breakdown pressure is applied to the element, causing deformation and damage to the element, further increasing the internal resistance and contact resistance of the element, resulting in deterioration of electrical characteristics. occurs.

This invention was made in order to solve the above-mentioned problems.The device stack can be easily incorporated into the conductor case, and when pressure is applied to the stack, the entire surface of the device can be uniformly pressurized. The purpose of this invention is to provide an efficient manufacturing method for electric double-layer capacitors and rigid capacitors.

The structure of the present invention is such that the element laminate is liquid-distilled and integrated with a heat-shrinkable tube to prevent the occurrence of misplacement of the elements 191 when the laminate is pressurized.

Embodiments of the present invention will now be described with reference to FIGS. 3 and 4 of the accompanying drawings.

As shown in the figure, a laminate 2 in which a predetermined number of elements 1 are piled up is fixed and integrated by being covered with an insulating heat-shrink tube 21 by shrinkage, and a conductor case 7 is shown with an electrode structure 6 stacked on top of the laminate 2. An electric double layer capacitor is constructed by contracting inward and applying pressure to the laminate 2 from above the electrode structure 6 to seal the upper end of the conductor case 7.

The heat-shrinkable tube 21 is formed into a cylindrical shape with a slightly larger diameter than the element 1 and a length corresponding to the vertical height of the laminate 2 .

To assemble the above electric double layer capacitor, there are two steps: inserting a laminate 2 in which a plurality of elements 1 are piled up into a heat shrink tube 21, and heating the heat shrink tube 21 from the surroundings to shrink it. By covering the laminate 2 with the tube 21, the heating process for fixing and integrating the laminate 2 can be easily performed.

In this way, the laminated body 2 fixed and integrated with the heat-shrinkable tube 21 is housed in the conductor case 7, the electrode structure 6 is stacked on top, and the upper end of the conductor case 7 is sealed by applying pressure to the laminated body 2. Bye.

As described above, since the present invention has the above configuration, it has the following effects.

(1) Element 81IW! One body was covered with heat shrink tube and fixed and integrated, so the laminate became one part.
It becomes easier to handle when stored in the conductor case.

+21 Since the one-layer body is fixed and integrated, it is easy to incorporate it into the conductor case, and automation of the assembly of electric double layer capacitors can be realized.

(3) Since the outer peripheral surface of each stacked element is covered with an insulating heat-shrinkable duplex, it is possible to prevent short circuits caused by contact between the conductor case and the element housed inside the conductor case.

(4) Show 1 of conductor case and element using heat-shrinkable duplex
- Since this can be prevented, there is no need to incorporate an insulating case to prevent short circuits, and the overall shape of the conductor can be made smaller.

(5) Since each laminated element is fixed and integrated, there is no misalignment of each element when the laminated body is pressed, and compressive force is applied uniformly to each element, reducing internal resistance and contact resistance, and improving characteristics. It is possible to reduce the variation in

(6) Since the heat-shrinkable duplex also follows the change in the thickness of the laminate when the laminate is pressurized, the fixing and integration of the laminate by the heat-shrinkable duplex does not pose any hindrance to the pressurization of the laminate.

[Brief explanation of the drawing]

Figure 1 is a vertical cross-sectional view of a conventional electric double layer capacitor;
The figure is an enlarged sectional view of the capacitor element used in the above, FIG. 3 is a longitudinal sectional view showing the electric double layer capacitor of the present invention, and FIG. 4 is an exploded perspective view showing the laminate and heat-shrinkable tube in the same. 1... Condenser υ element 2... Laminate 3... First
Electrode plate 4... Second electrode plate 3a, 4a... Electrode terminal 5... Insulating plate 6... Electrode structure 7... Conductor case 21... Heat shrink tube Patent applicant Murata Manufacturing Co., Ltd. Agent Patent Attorney Kazu 1) Showa 1 Figure 3 Figure 2 Figure 4

Claims (2)

[Claims] (1) In an electric double layer capacitor in which an electrode structure in which an insulating plate is interposed between the first electrode plate and the second electrode root is stacked on a laminate in which a plurality of electric double layer capacitor elements are stacked,
An electric double layer capacitor characterized in that an element laminate is fixed and integrated with an insulating heat-shrinkable tube filled with shrinkage liquid on the outer periphery. (2) In electric double layer capacitors, an electrode structure in which an insulating plate is interposed between the first electrode plate and the second electrode plate is stacked on a laminate in which a plurality of electric double layer capacitor elements are stacked. A step of inserting a laminate consisting of a plurality of double-layer capacitor elements into a cylindrical insulating heat-shrinkable cove, heating the heat-shrinkable tube from the surroundings, and covering the laminate with the shrunken tube. 1. A method for manufacturing an electric double layer capacitor, comprising a heating step for fixing and integrating the capacitors.