JPS63296330A - Dipole domain capacitor - Google Patents

Abstract

PURPOSE:To prevent the extension of damage over other parts even when an electrolyte leaks by sheathing a superposed capacitor body with a heat- shrinkable tubing, an inner surface of which has the layer of a high molecular absorber. CONSTITUTION:A plurality of capacitor bodies 1 are superposed so as to be connected in series, and an outer circumferential section is coated with a heat- shrinkable tubing 9. A high molecular absorber 9a is shaped onto the inner surface of the heat-shrinkable tubing 9 through a pressure sensitive adhesive 9b, and an electrolyte is absorbed by the high molecular absorber layer 9a and does not leak to the outside when the electrolyte leaks due to the abnormality of the capacitor body 1. Thereby, preventing even other parts from being broken or discolored.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric double layer capacitor used for memory backup in various electronic devices.

BACKGROUND OF THE INVENTION Conventional electric double layer capacitors of this type are made by press-molding activated carbon particles or kneading them with a suitable binder and coating them on a metal current collector, as shown in FIG.
A sprayed layer of aluminum is formed on activated carbon fibers to form polarizable electrodes 21, each of which is housed in a metal case 22 made of stainless steel, and an electrolytic solution and a separator 23 are placed between the two polarizable electrodes 21. The opening periphery of both metal cases 22 is connected to the gasket 24
It was constructed by sealing it through.

Further, as another conventional example, as shown in FIG. 7, one in which one electrode is a non-polarizable electrode 26 has been put into practical use.

Although electric double layer capacitors with this structure have a capacity on the order of farads compared to electrolytic capacitors, etc., the withstand voltage is low at around 3V, so several electric double layer capacitors are connected in series. Therefore, several capacitor elements are often connected in series and integrated.

As a specific example, a method is known in which two capacitors are connected in series and integrated by pressure contact via a conductive spring plate to obtain a high voltage with a rated voltage of 5.5V.

Problems to be Solved by the Invention Conventionally, when several capacitor elements are connected in series and integrated by an exterior body, a spring plate is used for the series connection.

It requires parts such as an insulating sleeve, electrode plate, and outer case, resulting in a large size. In addition, due to pressure contact caused by the spring plate, dirt on the outside of the electric double layer capacitor, and strong vibrations may cause gaps between the spring plate and the electric double layer capacitor, between the electric double layer capacitor and the electric double layer capacitor, and between the electric double layer capacitor and the electrode plate. There was a problem in that the electric double layer capacitor lost its function due to poor contact and conductivity, making it impossible to put it into practical use.

Furthermore, if the electrolytic solution used in the capacitor leaks, the electrolytic solution may stain or discolor the printed circuit board to which the capacitor is attached or other components placed around the capacitor, or lead to destruction of other components.

The present invention is intended to solve these problems, and aims to prevent damage from spreading to other components even if electrolyte leaks due to an abnormality in the capacitor.

Means for solving the problem In order to solve this problem, the technical means of the present invention are as follows:
The stacked capacitor body is covered with a heat-shrinkable tube with a layer of polymer absorber on the inside.

Effect The effect of the technical means with this configuration is as follows. That is, even if the electrolytic solution leaks from the capacitor body, the electrolytic solution will be absorbed and retained by the polymer absorber, and will not leak to the outside.

EXAMPLE Hereinafter, an example of the present invention will be explained using the drawings of FIGS. 1 to 5.

Fig. 1 shows the main parts of an electric double layer capacitor according to an embodiment of the present invention, Fig. 2 shows its external appearance, Fig. 3 shows the same disassembled state, and Fig. 4 shows an example of the capacitor main body. The heat shrink tube is shown in FIG.

In the figure, 1 is a capacitor body, and as shown in FIG.
An aluminum conductive electrode 4 is formed on one side of the carbon electrodes 2 and 3 by plasma spraying or the like, and each of the carbon electrodes 2 and 3 is placed in a metal case 6 made of stainless steel with an aluminum layer formed on the inner surface, and a metal lid 6 in which the carbon electrode 4 is formed. Electrode 2.3 and conductive electrode 4 are placed in a metal case 5. It is assembled so as to be in contact with the inner surface of the metal lid 6, and the metal case 5. The metal lid 6 and the conductive electrode 4 are connected by spot welding, and the polarizability of one of them is
Propylene carbonate and tetraethylammonium (tetrafluoropole) 1 for the official carbon electrode 2
The carbon electrodes 2 and 3 are butted together with an ion-permeable separator 7 interposed therebetween, and a gasket as a sealing member is attached to the opening periphery of the metal case 6 and the metal lid 6. 8, and the peripheral edge of the metal case 5 is curled and sealed.

There are multiple capacitor bodies 1 (the one shown is two).
They are stacked so as to be connected in series, and the outer periphery is covered with a heat shrink tube 9.

Reference numeral 10 denotes a bottomed cylindrical connection cup interposed between the capacitor bodies 1, and the metal cover 6 on the shaded maple side of one capacitor body 1 is connected by laser welding at the bottom of the connection cup 10. The other capacitor body 1 is disposed within this connection cup 1o, and the outer circumference of the metal case 5 on the anode side of the capacitor body 1 disposed inside is laser welded to the outer circumference. 11.12 is a welded joint.

13 and 14 are anode terminals connected to the metal case 5 and metal lid 6 of the capacitor body 1 by laser welding.

It is a cathode terminal.

Here, the heat shrink tube 9 has a polymer absorbent layer 9 &
In the structure in which electrolyte is provided through the adhesive 9b, if the electrolyte leaks due to dust or abnormality in the capacitor body 1, it will be absorbed by the polymer absorber layer 9a and will not leak to the outside.

Effects of the Invention As described above, according to the present invention, even if electrolyte leaks from the capacitor body, it will be absorbed and retained by the polymer absorber of the heat shrink tube, and will not leak to the outside. There is no need to destroy or discolor any of the parts, and it can be carried out at low cost since only the heat shrink tube is replaced.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main parts of an electric double layer capacitor according to an embodiment of the present invention, Fig. 2 is an external view of the same, Fig. 3 is an exploded perspective view of the same, and Fig. 4 is a capacitor used in the same capacitor. FIG. 5 is a cross-sectional view showing the main body, FIG. 5 is a perspective view of a heat-shrinkable tube of the capacitor, and FIGS. 6 and 7 are cross-sectional views for explaining the outline of the electric double layer capacitor. 1...Capacitor body, 2.3...Carbon electrode, 6...Metal case, 6...Metal lid, 7...Separator , 8... Gasket, 9... Heat shrink tube, 9a...
...Polymer absorber layer. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2 Figure 3

Claims (1)

[Claims] An element is constructed by stacking carbon electrodes with a separator in between and impregnating them with an electrolyte, and this element is sealed between a metal case that will serve as an anode terminal and a cathode terminal and an opening of this metal case via a sealing body. The capacitor body is formed by sealing the capacitor body with a metal lid that is attached to the capacitor body, and the capacitor bodies are stacked together, and the stacked capacitor bodies are covered with a heat-shrinkable tube that has a layer of polymer absorber on the inside. Electric double layer capacitor.