JPS63261818A - Electric double-layer capacitor - 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] Industrial applications The present invention relates to an electric double layer capacitor.

Conventional technology This electric double layer capacitor uses polarizable electrodes and an electrolyte (liquid).
It has a characteristic of high capacitance due to the electric double layer formed at the interface with There is.

This type of conventional product has a structure called a disk shape (coin shape, button shape) as shown in Fig. 2, and is made by molding materials such as graphite, activated carbon, carbon black, and some binder. A separator 3 impregnated with an electrolytic solution 2 is interposed between an electrode supported on an aluminum or stainless steel net or a carbon electrode 1 made of carbon fiber, especially activated carbon fiber cloth, and a metal case that serves as a current collector and an exterior material. 6,
A capacitor body 7 is sealed by a metal lid 5 and a sealing body 4 that serves as an insulator and a sealing material.

Furthermore, in the case of an electrode made of activated carbon fiber cloth, an aluminum layer is formed by plasma spraying or the like on the surface that contacts the metal case 6 and metal lid 5 in order to improve current collection.

Furthermore, as shown in Figure 3, the capacitor has a low withstand voltage of about 3V, so in order to match the drive voltage of semiconductor memory, which is about 5V, two or three capacitors are connected in series under the capacitor body. . The capacitor body 7 consists of a metal case 8 with leads, and an electrode plate 9 with leads. Insulating tube 10. Spring plate 11
The opening of the case 8 is fixed by caulking the opening of the case 8.

Problems to be Solved by the Invention The most important use of such conventional electric double layer capacitors is as a backup for semiconductor memories during power outages. In this application, there are cases where the power is left in a power outage state for a long period of time, such as when a momentary power outage occurs or when the set is being moved.

In such cases, high capacitance is required. As a way to deal with this problem, for example, the manufacturing method for products with twice the capacitance of conventional methods is as follows.
Possible options include: - parallel use of conventional products, and - increase in capacitance by increasing the diameter or thickness of the electrodes that make up the element body. but,
The former requires more work and installation space for the set manufacturer to integrate into the printed circuit board, while the latter requires changes to the electrode manufacturing method and new mold construction due to changes in the diameters of various parts such as the metal case and metal lid, which increases costs for both parties. It became.

The present invention aims to solve these problems by using a conventional capacitor body and increasing only the height without changing the current diameter. This provides a capacitor that can handle high voltage and high capacitance.

Means for Solving the Problem In order to solve this problem, the present invention stores at least two element bodies in at least two mutually independent insulating cylinders, and stores them in this state in an exterior case. The plurality of element bodies are connected in series and in parallel through connection leads.

Effect: With this configuration, by connecting at least two elements in series, at least twice the withstand voltage can be obtained, and by connecting at least two sets of these series-connected bodies in parallel, the capacitance can be doubled. Can be done.

EXAMPLE Hereinafter, as an example of the present invention, a case will be described in which four element bodies are used.

FIG. 1 shows an embodiment of the present invention, and in the figure,
The capacitor body 7 is the same as the conventional one. The height of the metal case 12 with leads is also increased. The electrode plate 13 with leads and the spring plate 16 are all the same as the conventional product.

However, although the insulating cylinders 10 have the same shape, the upper and lower parts are independent, just like two conventional insulating cylinders are inserted. The two capacitor bodies 7 in each insulating tube 10 are connected in series, and a lead plate 17.1 is connected between the insulating tubes 1o.
8 are connected in parallel. The lead plate 17 is guided into the interior through a notch provided at the bottom of the insulating cylinder 1o, and connects the capacitor elements 7 of the same polarity. The lead plate 18 connects the same poles of the capacitor bodies 7 exposed at the opening of the insulating tube 1o, but in this case, since the metal case 12 also serves as a lead, the capacitor bodies 7 are connected to each other. There is no need to connect directly with a lead, and the spring plate 16
．． It may also be connected to a portion of the metal case 12. Of course, the connection with the lead plates 17, 18 may be made by pressure contact, but for greater reliability, welding may also be considered. Note that the opposing portions of the metal case 12 with leads and the lead plate 17 are electrically insulated so as not to come into contact with each other.

Next, specific examples of the present invention will be described.

First, activated carbon fiber cloth was used as a polarizable electrode.

It has a thickness of 0.6g, a basis weight of 12697wt, and a surface area of 200077//9, and these are made of two φ6
A metal case having an outer diameter of φ11, a corresponding metal lid, and a sealing body were prepared. The metal case with negative potential is stainless steel 5US304.

The positive metal lid used aluminum for the inner surface and stainless steel SUS 304 for the outer surface, making the two clad and integrated. The separator is a non-woven fabric made of polypropylene fibers, thickness o, 35mm, basis weight so.
'l/i porous sheet. The sealing body is a polypropylene resin molded product.

Furthermore, four of these capacitor elements were connected in series and in parallel using the series and parallel connection members shown in FIG. 1 to produce a product.

Table 1 shows the electrical characteristics (capacitance, internal resistance, leakage current...30 minutes after applying 5.5V) of the conventional product (two conventional products connected externally) and the present invention product. (value) and external dimensions.

(Left below) As can be seen from Table 1, compared to the conventional product, the product of the present invention has
Same electrical characteristics (capacitance, internal resistance, leakage current)
Therefore, the external dimensions can be reduced.

As described in detail, according to the electric double layer capacitor of the present invention, a conventional capacitor body can be used as is, it can be constructed by making some changes to the connecting members, and it is possible to standardize electrode materials and manufacturing equipment. It has become possible, and its industrial value is great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric double layer capacitor 2 according to an embodiment of the present invention, FIG. 2 is a sectional view of a capacitor body, and FIG. 3 is a sectional view of a conventional series type electric double layer capacitor. 1... Carbon electrode, 2... Electrolyte, 3.
... Separator, 4... Sealing body, 5...
・Metal lid, 6...Metal case, 7...
Capacitor body, 1o...Insulating tube. 12...metal case, 13...pole plate,
16... Spring plate, 17.18... Lead plate. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A separator and an electrolytic solution are interposed between the carbon electrodes, and an element body is constructed by storing the element body in a space formed by a metal lid and a metal case that also serve as current collectors, and at least two of the element bodies are arranged in each case. An electric double layer capacitor, which is housed in two mutually independent insulating cylinders, housed in an exterior case in this state, and connected in series and parallel with the plurality of element bodies by connecting leads.