JP2003217985A - Laminated electric double-layer capacitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated electric double-layer capacitor, in which the processing costs of a collection terminal are low and which is easy to replace. <P>SOLUTION: A gel electrolytic film 4 is pinched in between collecting electrode plates 2, having one surfaces adhered to an active carbon electrode, and in the outer peripheral parts thereof, packings 3 having sealing function are laminated by pinching and further these are clamped from both sides by an end plate 1, to form a capacitor unit of an airtight structure. The collecting electrode plate 2 is brought into contact with a thin flexible metal plate as a collection terminal 22. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a laminated electric double layer capacitor. Specifically, the present invention relates to a current collecting structure in a laminated electric double layer capacitor.

[0002]

2. Description of the Prior Art As shown in FIG. 5, a conventional laminated electric double layer capacitor (hereinafter referred to as a capacitor) has an aluminum foil base between two collector electrode plates 2 each having an activated carbon electrode bonded to one surface thereof. It has a bipolar structure in which a polarized electrode (intermediate electrode) 5 having an activated carbon electrode adhered to both surfaces of the material and a gel electrolyte membrane 4 functioning as a separator are alternately sandwiched and sandwiched, and the gel electrolyte membrane 4 sandwiched between opposed activated carbon electrodes is formed. The smallest unit is called a cell. A rubber packing 3 having a sealing function is sandwiched and laminated on the outer peripheral portions of the activated carbon electrode and the collecting electrode so as to prevent the internal electrolytic solution and electrolyte salt from leaking out.

The packing 3 also has an insulating function to prevent the intermediate electrodes 5 from touching each other. Further, cells for the required withstand voltage (1 cell withstand voltage of about 2.5V) are stacked, and finally, as shown in FIG. 6, sandwiched by the end plates 1 from both sides, and tightened with tightening bolts 7 via insulating spacers 6. As a result, a sealed structure is maintained, and a pressure is applied to the inside of the cell, which is assembled as a capacitor unit.

The multilayer capacitor unit has a collector electrode plate 2
If a lead wire is attached to the unit, it will be connected in series within the unit, and a withstand voltage of (1 cell withstand voltage) × (number of stacked cells) will be obtained. This multilayer capacitor unit does not require a cable or the like as compared with a capacitor of the same capacity using a general winding method, and can be designed compact and high in withstand voltage, so that the installation volume can be reduced.

[0005]

As shown in FIG. 7, the above-mentioned conventional electric double layer capacitor unit has a 1 mm thick aluminum plate with an activated carbon electrode 12 as a collector electrode plate 2 for extracting electricity. Is used. This collector electrode plate 2 has a width of 1 in order to lead the conductor outside the unit.
A terminal portion (current collecting terminal) 2a having a length of 5 mm and a length of 30 mm is projected to the outside of the packing 3, and a current collecting cable (not shown) is directly connected to this.

When an aluminum plate having a thickness of 1 mm is machined so as to project the terminal portion 2a as shown in FIG. 7, it takes a lot of man-hours as compared with the case where the aluminum plate is machined into a rectangular shape.
This is one of the causes of rising costs. Furthermore, this collector electrode plate 2
Since the cable is directly attached to the terminal, if the terminal is damaged during the cable installation process, etc., it cannot be replaced and will be fatally damaged as a unit.

The reason for using a thick metal plate having a thickness of 1 mm as the collecting electrode plate 2 is to collect the current effectively from the entire electrode surface to reduce the resistance, and to secure the packing of both end faces of the unit to the collecting electrode having high rigidity. To improve the sealing performance,
The reason is to prevent the unit from being crushed and destroyed when the pressure inside the unit is reduced.

[0008]

A laminated electric double layer capacitor according to claim 1 of the present invention which solves the above problems has a gel electrolyte membrane sandwiched between two collector electrode plates having an activated carbon electrode bonded to one surface thereof. A packing having a sealing function is sandwiched between the outer peripheral portions of these layers, and these are further tightened from both sides with end plates to form a sealed capacitor unit. A thin and flexible metal plate is used as a current collecting terminal on the collector electrode plate. It is characterized in that they are brought into contact.

A laminated electric double layer capacitor according to a second aspect of the present invention, which solves the above-mentioned problems, connects a plurality of capacitor units in parallel or in series by sandwiching the metal plate described in the first aspect with clips. It is characterized by doing.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] FIG. 1 shows a laminated electric double layer capacitor according to a first embodiment of the present invention. In this embodiment, the functions of the collector electrode plate 2 and the collector terminal 22 are divided. That is, a collector electrode plate 2 to which an activated carbon electrode is adhered, and a polarized electrode (intermediate electrode) 5 to which an activated carbon electrode is adhered to both surfaces of an aluminum foil base material and a gel electrolyte membrane 4 are alternately stacked and a plurality of cells are stacked in a bipolar structure. The end plate 1 is tightened from both sides of each collector electrode plate 2 through the collector terminal 22 to maintain a hermetically sealed structure and apply a pressure to the inside of the cell.

The collector electrode plate 2 has a thickness of 1 as in the conventional case.
mm aluminum plate is used as it is, and the current collecting ability, sealing ability, and shape retaining ability are used as they are. However, the shape is a perfect quadrangle, and the function of guiding the conductor to the outside of the unit is lost. On the other hand, between the collector electrode plate 2 and the end plate 1 on both end faces of the unit, the thickness is about 0.2 mm and the width is 40 m.
A strip-shaped aluminum plate having a length of m and a length of 260 mm is sandwiched as the current collector terminal 22, and one end of the aluminum plate is projected to the outside of the unit, and the bolt 6 for pressing between the cells is tightened.

Due to the tightening force acting between the collector terminal 22 and the end plate 1, the collector electrode plate 2 and the strip-shaped collector terminal 2
2 come into complete contact with each other, and electricity can be taken out from the current collecting terminal 22. If the terminal thickness of the collector terminal 22 is too thick, the tightening pressure from the end plate 1 becomes non-uniform, which adversely affects the capacitor characteristics and the sealing characteristics. On the other hand, if it is too thin, it becomes difficult to obtain the required terminal cross-sectional area, and a thickness of about 0.2 mm is appropriate.

As described above, in this embodiment,
The collector electrode plate 2 has a quadrangular shape, and the collector terminal 22 is a thin strip-shaped aluminum plate that is tightened and brought into contact with each other by pressure so that current can be collected and the component manufacturing cost can be reduced by 50% compared with the conventional case. You can Further, when the current collecting terminal 22 is damaged, the parts can be replaced by simply loosening the fastening bolt 6 of the capacitor unit. The shape of the collector terminal 22 can be selected and exchanged according to the application, and there is an advantage that versatility is increased. In addition, +,-current collector terminal 2
When 2 is projected to the same surface side, a compact connection becomes possible, as will be described later in Examples.

[Embodiment 2] FIG. 2 shows a laminated electric double layer capacitor according to a second embodiment of the present invention. This embodiment relates to a case where a plurality of multilayer capacitor units are connected in series compactly. That is, as shown in FIG. 2, the capacitor unit 20 of the first embodiment is connected to the collector terminal 22.
The surfaces where a and 22b are exposed are aligned, and the capacitor units 20 of the number required for series connection are fixed to a case, a rack, etc. (not shown).

The adjacent capacitor units are connected to each other as shown in FIG.
As shown in, the + and-collector terminals 22a and 22b are attached so that they are at the same position. + Collector terminal 22a and-collector terminal 22b of each capacitor unit 20
6 is sandwiched between the dedicated metal clips 30 shown in FIG. 6, and as shown in FIG.

In this embodiment, the metal clip 30 has a thickness of 1
It was manufactured by bending an aluminum plate of mm. That is, the metal clip 30 has a shape folded by the bending portion 30a. Since the collector terminal 22 is thin and flexible, it can be connected with the metal clip 30 without difficulty. In this way, the collector terminal 2 of each capacitor unit 20
By sandwiching 2a and 22b, it is possible to take out electricity from the current collecting terminals 22a and 22b at both ends of the capacitor unit 20 by connecting all the units in series.

As described above, in this embodiment, the collector terminals 22 of the adjacent capacitor units 20.
By alternately arranging the polarities of a and 22b and sandwiching the positive and negative poles of the adjacent capacitor units 20 with the metal clip 30 by the flexible collector terminals 22a and 22b, a plurality of capacitor units 20 can be compactly formed. It can be connected in series.

[Embodiment 3] FIG. 4 shows a laminated electric double layer capacitor according to a third embodiment of the present invention. This embodiment relates to a case where a plurality of multilayer capacitor units are compactly connected in parallel. That is, as shown in FIG. 4A, the capacitor units 20 of the above-described first embodiment are brought into contact with the surfaces having the terminals, and the required number of capacitor units 20 for series connection are provided in a case, a rack or the like (not shown). Fix it.

All the capacitor units 20 are mounted so that the + and-terminals are at the same position, as shown in FIG. At this time, the strip-shaped collector electrode terminals 22a and 22b attached to the capacitor unit are taken out to the outside of the unit long. The + collector electrode terminal 22a and the-collector terminal 22b of each capacitor unit are bundled and sandwiched by the dedicated metal clip 30, as shown in FIG.
As shown in (c), it is fixed with a bolt 40 and a current collecting cable 50 is attached.

The current collecting terminals 22a and 22b protruding from the metal clip 30 are cut off. Current collecting terminals 22a, 22
Since b is flexible, it can be connected in a bundle without difficulty. Current collecting cable 5 connected to the metal clip 30
From 0, electricity can be taken out in a state where all the units 20 are connected in parallel.

As described above, in this embodiment, the collector terminals 22 of the adjacent capacitor units 20.
By placing the polarities of a and 22b in the same direction and arranging them, the positive and negative poles of the flexible collector terminals 22a and 22b are collectively held by the metal clip 30, and a plurality of capacitor units 20 are compactly arranged in parallel. Can be connected to.

[0022]

As described above in detail with reference to the embodiments, according to the present invention, the collector terminal is independent of the collector electrode plate, and is tightened as a thin strip-shaped aluminum plate, and both are pressed by pressure. It becomes possible to collect current by touching
The parts manufacturing cost can be significantly reduced. In addition, if the collector terminal is damaged, parts can be replaced by simply loosening the unit's tightening bolts. Further, by sandwiching the current collecting terminals of adjacent capacitor units with clips, a plurality of capacitor units can be compactly connected in series or in parallel to form a capacitor module.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a laminated electric double layer capacitor according to a first embodiment of the present invention, and FIG. 1 (b) is a perspective view showing its assembling process.

FIG. 2 is a perspective view showing a series connection of laminated electric double layer capacitors according to a second embodiment of the present invention.

FIG. 3 is a structural diagram of a metal clip for connecting terminals.

FIG. 4 (a) is a perspective view showing a series connection of laminated electric double layer capacitors according to a third embodiment of the present invention, FIG.
(B) is a structural diagram of a metal clip for connecting terminals.

FIG. 5 is a basic configuration diagram of a laminated electric double layer capacitor.

FIG. 6 is a sectional view showing a structure of a conventional capacitor unit.

FIG. 7 is a plan view showing the shape of a conventional collector electrode plate.

[Explanation of symbols]

1, 1a, 1b, 11 End plate 2 collector electrode plate 3 rubber packing 4 gel electrolyte membrane 5 polarized electrodes 6 Insulation spacer 7 Tightening bolt 8 Resin spacer 9 flat head screws 20 Capacitor unit 30 metal clips 40 tightening bolt

Claims (2)

[Claims] 1. A gel electrolyte membrane is sandwiched between two collecting electrode plates having an activated carbon electrode adhered to one side thereof, and packing having a sealing function is sandwiched between the outer periphery parts thereof, and these are laminated from both sides by end plates. A laminated type electric double layer capacitor, characterized in that a thin and flexible metal plate is brought into contact with the current collecting electrode plate as a current collecting terminal by tightening to form a hermetically sealed capacitor unit. 2. The laminated electric double layer capacitor according to claim 1, wherein a plurality of capacitor units are connected in parallel or in series by sandwiching the metal plate with clips.