JPH10144576A - Electric double layer capacitor bank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an equipment at a low cost as compared with the conventional ones, by making constitution that not a conventional single body type configuration having a case but a plurality of electric double layer capacitor units having configuration which are not built in cases are accommodated in a sheath case, in an electric double layer capacitor bank which a plurality of laminated type electric double layer capacitors are accommodated in a sheath case. SOLUTION: A plurality of square electric double layer capacitor units 1 in which a plurality of positive electrodes and negative electrodes are alternately laminated interposing separaters between them are impregnated with electrolytic solution and accommodated in a square sheath case. Positive electrode external terminals 18a and negative electrode external terminals 18b of a composite capacitor circuit constituted by connecting these electric double layer capacitor units are arranged. A printed circuit board on which a charge limiting circuit for limiting charge when terminal voltages of the respective electric double layer capacitor units, at the time of charging, reach the rated voltage is mounted is installed in the sheath case.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage, large-capacity electric double-layer capacitor bank used as a power source for electric wheelchairs, electric bicycles, electric power tools, and the like.
The present invention relates to an electric double layer capacitor bank in which a plurality of multilayer electric double layer capacitor units are housed in an outer case and connected to form a capacitor bank (capacitor assembly).

[0002]

2. Description of the Related Art As is well known, an electric double layer capacitor utilizes electric energy by electric charges accumulated in an electric double layer formed at an interface between a polarizable electrode mainly composed of activated carbon and an electrolyte. And can be charged like a secondary battery. Conventionally, as a large-capacity electric double-layer capacitor having a capacitance of about several thousand F (Farad), a plurality of rectangular positive and negative electrodes are used as a power supply for temporarily supplying large energy. There is known a laminated electric double-layer capacitor described later in which a rectangular electrode laminated body alternately laminated with a separator interposed therebetween is housed in a rectangular case.

The withstand voltage of an electric double layer capacitor is regulated to be equal to or lower than the decomposition voltage of an electrolytic solution (electrolyte) in order to eliminate damages such as a decrease in capacitor capacity and an increase in leakage current. It is as low as ~ 5V.

For this reason, since the withstand voltage of the electric double-layer capacitor is low as described above, a plurality of multilayer electric double-layer capacitors are used in high-voltage, large-capacity applications used as, for example, power supplies for driving motors. Are connected in series, and an electric double layer capacitor bank is used. For example, as a single unit, ten laminated electric double layer capacitors having a withstand voltage (rated voltage) of 3.5 V and a capacity of 3000 F are connected in series.
An example is a high-voltage, large-capacity electric double-layer capacitor bank having a withstand voltage of 35 V and a capacity of 300 F.

FIG. 13 is a view for explaining an example of a conventional electric double-layer capacitor bank, and FIG. 14 is a partial cut-away view of a configuration example of a multilayer electric double-layer capacitor constituting the capacitor bank of FIG. FIG. The conventional electric double-layer capacitor bank has a double case structure in which a required number of laminated electric double-layer capacitors in a unitary form (form) with a case are further housed in one outer case, as described later. It is. First, the multilayer electric double layer capacitor will be described.

As shown in FIG. 14, a positive electrode 61 has a rectangular sheet-like positive electrode collector 63 having a narrow band-shaped lead (not shown), and rectangular sheet-like polarizable electrodes disposed on both sides thereof. 65. The negative electrode 62 includes a rectangular sheet-shaped negative electrode collector electrode 64 having a lead portion, and rectangular sheet-shaped polarizable electrodes 65 arranged on both sides of the negative electrode collector electrode 64. The positive electrode 61 and the negative electrode 6
2 are alternately stacked by a predetermined number with a separator 66 interposed therebetween. The positive electrode collecting electrode 63
The negative electrode collector electrode 64 and the negative electrode collector electrode 64 are stacked such that the lead portions for terminal connection are located at the left and right opposite positions. Also, in this example, the outermost negative electrode and positive electrode (the positive electrode is not shown) are provided with polarizable electrodes only on one side of the collector.

[0007] In order to make the collector electrode and the polarizable electrode of each of the electrodes 61 and 62 adhere to each other, these laminated products are pressed in the laminating direction via pressing plates 67 arranged on both outermost sides. Then, taping and fixing is performed with a fastening tape 68 to obtain a square electrode laminate. The electrode laminate is impregnated with a predetermined electrolytic solution, accommodated in a square case 69, and connected in parallel to each other by the adjacent positive electrode 61 and negative electrode 62 via a separator 66 to increase the capacity. In order to obtain an electric double layer capacitor,
The leads of each positive electrode collecting electrode 63 are collectively connected to the positive electrode terminal 70 fixed to 9a by caulking or the like, and the leads of each negative electrode collecting electrode 64 are collectively connected to the negative electrode terminal 71. Thereafter, a case upper lid 69a is attached to the opening of the rectangular case 69 to seal it.

[0008] In this manner, a monolithic electric double-layer capacitor 80 with a rectangular case is assembled. The polarizable electrode 6 containing activated carbon as a main component.
5 has a thickness of about 0.1 to 2.0 mm, and the collector electrodes 63 and 64, which are conductors in contact with the polarizable electrode 65, are made of aluminum foil having a thickness of about 7 to 50 μm. It is. The separator 66 is
It is made of a porous material having ion permeability and electrical insulation, for example, a polypropylene film (polypropylene fiber non-woven fabric), and has a thickness of about 25 μm. As the electrolyte, an organic electrolyte such as a propylene carbonate solution containing a special salt is used.

As shown in FIG. 13, a conventional electric double-layer capacitor bank is a single-layer type electric double-layer capacitor 8 with a case incorporated in a rectangular case 69.
0 is stored in the outer case 81 in a required number, and a positive external terminal and a negative external terminal (not shown) of a composite capacitor circuit configured by connecting a plurality of the multilayer electric double layer capacitors 80 in series are provided on the case upper cover 81a. Things.
The number of the multilayer electric double-layer capacitors 80 housed in the outer case 81 is about 10 to 40 from the viewpoint that the upper limit weight that a person can safely carry as a capacitor bank is about 20 kg.

[0010]

However, in the above-mentioned conventional electric double-layer capacitor bank, a plurality of (for example, 10 to 40) monolithic electric double-layer capacitors each having a case are further provided in the outer case. Degree) There is a disadvantage that the price is high because it has a double case structure that can be stored.

Therefore, the present invention provides a high-voltage / multi-layer capacitor in which a plurality of multilayer electric double-layer capacitors are housed in an outer case.
In a large-capacity electric double-layer capacitor bank, multiple electric double-layer capacitor units in a form that is not a single unit with a case but are not assembled into a case are housed in a single exterior case. And to provide an inexpensive electric double layer capacitor bank.

[0012]

In order to achieve the above object, an electric double layer capacitor bank according to the present invention comprises a plurality of positive electrodes comprising a polarizable electrode mainly composed of activated carbon and a positive electrode collecting electrode; A plurality of negative electrodes composed of a polarizable electrode having a main component and a negative electrode collector are alternately stacked with a separator interposed therebetween, and are constituted by an adjacent positive electrode and negative electrode with the separator interposed therebetween. A rectangular electric double layer capacitor unit consisting of cells connected in parallel,
A plurality of electrolytic capacitors are impregnated and housed in the outer case, and a positive external terminal and a negative external terminal of a composite capacitor circuit configured by connecting the plurality of electric double-layer capacitor units are provided, while each of the above-mentioned components during charging is provided A printed circuit board having a charge limiting circuit for limiting charging when a terminal voltage of the electric double layer capacitor unit reaches a predetermined value is provided in the outer case. Further, the electric double layer capacitor bank includes:
The outer case includes a bag-shaped diaphragm chamber that contracts and expands in accordance with the inner pressure of the outer case, and a safety valve that discharges the inner pressure of the outer case equal to or more than a predetermined value to the outside of the outer case.

The electric double-layer capacitor bank according to the present invention is a rectangular electric double-layer capacitor unit formed by alternately stacking a plurality of positive electrodes and negative electrodes with a separator interposed therebetween and connecting each cell in parallel. Are impregnated with an electrolytic solution, are housed in a rectangular outer case, and are connected to form a capacitor bank. That is, the electric double-layer capacitor bank according to the present invention accommodates a plurality of electric double-layer capacitor units in a case that is not a conventional single-unit type with a case and is not incorporated in a case, and forms a capacitor bank in an outer case. This eliminates the need for a rectangular case for each electric double-layer capacitor unit, and eliminates the need for a laborious case installation work (housing work) for attaching a case to each individual unit. It becomes lighter.

Further, in the electric double layer capacitor bank according to the present invention, a printed circuit board on which the charge limiting circuit is mounted is provided in the outer case, and even if the rated voltage (withstand voltage) of each electric double layer capacitor unit varies. Since a voltage exceeding each rated voltage is not applied to any of the electric double layer capacitor units, each electric double layer capacitor unit can be charged to the full rated value without causing the capacitor to be damaged by overcharging.

Further, since a double safety device comprising a bag-shaped diaphragm chamber made of, for example, a polyethylene film having a laminated multilayer structure and formed in a bag shape and a safety valve is provided in the outer case, safety is improved. Extremely high. The bag-shaped diaphragm chamber (expiratory bag) that communicates with the outside air (atmosphere)
When the pressure in the outer case (pressure in the gas phase portion) rises due to, for example, a temperature rise caused by charge and discharge, the pressure in the bag-shaped diaphragm chamber is absorbed by absorbing the pressure rise by discharging the air inside the bag-shaped diaphragm chamber to the outside of the outer case. Thereafter, when the pressure in the outer case drops to about the atmospheric pressure, outside air flows in and the airbag recovers to its original expanded state. The safety valve is activated when an unexpected situation occurs, for example, when the inside of the outer case becomes high temperature due to discharge due to a short circuit inside the capacitor caused by external force, the decomposition gas is rapidly generated, and the internal pressure inside the outer case rises abnormally. The internal pressure of the outer case that is higher than the value is discharged to the outside of the case.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an electric double layer capacitor unit of an electric double layer capacitor bank according to the present invention, and FIG. 2 is an explanatory diagram of a configuration of an electrode laminate of the electric double layer capacitor unit shown in FIG.

First, the structure of the electrode laminate of the electric double layer capacitor unit (hereinafter simply referred to as a capacitor unit) 1 of this embodiment will be described. As shown in FIG.
Is composed of a rectangular sheet-shaped positive electrode collector 13 having a narrow band-shaped lead portion, and rectangular sheet-shaped polarizable electrodes 15 arranged on both sides of the collector electrode 13. The negative electrode 12
Is a rectangular sheet-shaped negative electrode collecting electrode 14 having a lead portion.
And rectangular sheet-shaped polarizable electrodes 1 arranged on both sides of the
5. The positive electrode 11 and the negative electrode 12 are alternately stacked by a predetermined number with a rectangular sheet-shaped separator 16 interposed therebetween.

Each of these stacked electrodes is connected to each of the electrodes 11,
In order to make the collector electrode and the polarizable electrode in close contact with each other, a thin stainless steel (SUS30)
4) Taping and fixing with a tightening tape (not shown) in a state of being pressed in the laminating direction via the pressing plate 17 made of, to obtain a square electrode laminate. The positive electrode collecting electrode 13 and the negative electrode collecting electrode 14 are stacked such that the lead portions for terminal connection are located at opposite positions on the left and right, respectively. Also, in this example, the outermost negative electrode and positive electrode are provided with polarizable electrodes only on one side of the collector.

As shown in FIG. 1, each positive electrode collector electrode 1 of the electrode laminate is connected to an aluminum positive electrode connection terminal 18a.
3 are collectively caulked and joined, and similarly, the leads of the respective negative electrode collector electrodes 14 of the electrode laminate are integrally caulked to the aluminum negative electrode connection terminal 18b, and are adjacent to each other with the separator 16 interposed therebetween. A rectangular capacitor unit 1 is assembled in which cells formed by a positive electrode 11 and a negative electrode 12 are connected in parallel. Regarding the caulking connection, more specifically, Japanese Patent Application No. 8-58-58 filed by the present applicants.
030, the connection terminals 18a, 18
As b, a terminal with a projection pin having a projection pin is used,
Each of the lead portions provided with the projection pin insertion holes and then a flat washer are fitted into the projection pins in this order, and thereafter, the heads of the projection pins are hit, so that the connection terminals 18 are formed.
The lead portions are collectively caulked to a and 18b.

Here, the above-mentioned rectangular polarizable electrode 15 is formed.
In this example, 80% by weight of activated carbon powder, 10% by weight of PTFE (polytetrafluoroethylene) as a binder, and 10% by weight of carbon black for improving conductivity
Is kneaded and formed into a sheet, and has a thickness of 0.5 mm, a short side of 46 mm and a long side of 92 mm. The collector electrodes 13 and 14 have a thickness of 10 μm in this example.
m, an aluminum foil having a length of 18 mm in width × 20 to 80 mm in length, and a collector of 46 mm in short side × 92 mm in long side. In this example, the porous separator 16 having ion permeability and electric insulation is made of a polypropylene film (polypropylene fiber non-woven fabric) having a thickness of 25 μm, and its size is slightly larger than the polarizable electrode 15. In the capacitor unit 1 of this example, an organic electrolytic solution to be described later is impregnated into the polarizable electrode 15 and the separator 16 so that a large-capacity capacitor having a withstand voltage of 3.5 V and a capacity of 3000 F is formed. (One cell is constituted by the adjacent positive electrode 11 and negative electrode 12) and 20 cells are connected in parallel.

Next, in this example, a propylene carbonate solution (organic solvent) in which tetraethylammonium tetrafluoroborate as an electrolyte salt is dissolved is used as the organic electrolytic solution, and the polarizable electrode of the capacitor unit 1 constructed as described above is used. 15 and the separator 16 were impregnated with this organic electrolytic solution.

FIG. 3 is a perspective view showing a state in which the electric double layer capacitor unit shown in FIG. 1 is impregnated with an electrolytic solution and then attached with a bag-shaped insulator. After the impregnation with the electrolytic solution, a bag-shaped insulator (bag-shaped insulator) 2 is attached to the electrode laminate of the capacitor unit 1 as shown in FIG. The electrode laminate is not hermetically sealed by the bag-shaped insulator 2, and the bag-shaped insulator 2 has its upper end inner peripheral portion fixed to each of the pressing plates 17 arranged on both outermost sides of the electrode laminate. The bag-shaped insulator 2 is for preventing a plurality of capacitor units from coming into contact with each other through an electrolyte oozing out of each capacitor unit, and is made of a material having an electric insulation property and not allowing an electrolyte to pass therethrough. Made of poor quality polypropylene.

FIG. 4 is a diagram related to the electric double layer capacitor bank of the present invention, and is a perspective view showing a state in which a plurality of electric double layer capacitor units are attached to the outer case inner lid, and FIG. It is a perspective view which shows the exterior case main body of a double layer capacitor bank.

A plurality of capacitor units 1 to which the above-mentioned bag-shaped insulator 2 (not shown in FIG. 4) is mounted.
The connection terminals 18a and 18b are respectively attached to the outer case inner lid 3c (see FIG. 4), and the outer case body 3a has a rectangular box shape as shown in FIG.
Is stored inside. In this example, ten (only five in FIG. 4) capacitor units 1 connected in series are housed in the outer case body 3a. The outer case inner lid 3b has a rectangular shape in a plan view and has side walls having a low height along four sides. The inner lid 3b and the outer case main body 3a are formed.
Is an injection molded product made of polypropylene resin.

FIG. 8 is a plan view showing an electric double layer capacitor bank according to the present invention in a state where an outer case lid and a printed circuit board, which will be described later, are removed, and FIG.
FIG. 10 is a sectional view taken along the line BB of FIG. 8.
In FIGS. 8 and 9, for each capacitor unit 1, the collector lead connected to the connection terminals 18a and 18b and the bag-shaped insulator 2 are not shown.

As shown in FIGS. 8 and 9, in the outer case body 3a, ten capacitor units 1 each having the bag-shaped insulator 2 (not shown) are arranged on the same surface with five in a row. Two rows are arranged in parallel. The connection terminals 18a and 18b of each capacitor unit 1 are screwed to the bottom of the outer case inner lid 3b fixed on the outer case main body 3a. These ten capacitor units 1 are connected in series. Also,
Exterior case body 3a has a partition plate 3a ₁ which extends to the case width direction at the position of the one end face closer in the case longitudinal direction, between the partition plate 3a ₁ and the outer casing body end face, the outer casing body 3a There is provided a bag-shaped diaphragm chamber 4 which can be contracted and expanded freely according to the internal pressure. Further, a safety valve 5 for discharging the internal pressure of the outer case main body equal to or more than a predetermined value to the outside of the outer case 3 is attached to the outer case inner lid 3 b at a position close to the bag-shaped diaphragm chamber 4. The bag-shaped diaphragm chamber 4 and the safety valve 5 constitute a set of safety devices.

The bag-shaped diaphragm chamber 4 is shown in FIGS.
As shown in FIG. 0, a bag-shaped polyethylene film bag 4b is arranged outside the small-diameter cylindrical body 4a extending in the vertical direction so as to wrap and cover the small-diameter cylinder 4a, and the open end of the bag 4b is closed. Fixed to the outer peripheral surface of the base of the small-diameter cylindrical body 4a.
A bag-shaped space that freely contracts and expands and deforms is formed. Then, the lid 3b in the outer casing, having a gas vent hole 3b ₂ communicating with the outside air, and has an inner peripheral surface cap 3b ₁ internal thread portion is engraved on are formed, the bag 4b
By There screwing the proximal external thread portion of the small diameter cylindrical body 4a attached to the female screw portion of the cap portion 3b _1, with the bag-like diaphragm chamber 4 to the cap portion 3b ₁ of the inner lid 3b is supported by the upright position I have.

The safety valve 5 is a so-called spring-type safety valve having a gas vent hole 5a for communicating with the outside air and using a compression coil spring 5b. As shown in FIGS. 3b. In this example, the outlet pressure (gauge pressure) of the safety valve 5 is 0.02 to 0.02.
0.05 MPa, blow-off pressure: 0.01 MPa.

Next, the printed circuit board 6 disposed in the outer case inner cover 3b will be described. FIG. 6 is a perspective view showing a schematic appearance of a printed circuit board mounted with a charge limiting circuit of the electric double layer capacitor bank according to the present invention.

A printed circuit board 6 on which a charge limiting circuit MC described later is mounted has a schematic appearance as shown in FIG.
Electrical components (not shown) such as a resistor and a transistor for realizing the charge limiting circuit MC, a plurality of aluminum heat sinks 6a, 1
External terminal block 7 (positive electrode external terminal 7a) of a composite capacitor circuit configured by connecting zero capacitor units 1 in series.
And a plug-in terminal block for the negative external terminal 7b). Aluminum heat sink 6a
A female screw for an upper cover mounting screw 8 is engraved in the, so as to also serve as a mounting portion of an outer case upper cover 3c described later. The single printed circuit board 6 is accommodated in the outer case inner cover 3b.

FIG. 11 is a diagram showing an example of an electric circuit configuration of the electric double layer capacitor bank according to the present invention, and FIG. 12 is a circuit diagram showing an example of the charge limiting circuit of FIG.

As shown in FIG. 11, the electric double layer capacitor bank of this example has a series combined capacitor circuit in which ten capacitor units 1 are connected in series so as to be used for high voltage and large capacity applications. In order to eliminate overcharging of the capacitor unit 1, for each of the capacitor units 1 connected in series, a charge limiting circuit MC for limiting the charging when the terminal voltage at the time of charging reaches the rated voltage value of each unit 1. Is provided in the electrical circuit configuration. This type of charge limiting circuit has been proposed in Japanese Patent Application Laid-Open No. Hei 6-261452.

FIG. 12 shows an example of the charge limiting circuit. The charge limiting circuit MC is composed of a shunt regulator IC1, which operates similarly to a zener diode, a transistor Q1, a diode D1, and resistors R1 to R5.
C are connected in parallel. When the terminal voltage of the capacitor unit 1 reaches the rated voltage during charging,
The transistor Q1 is turned on to prevent the charging current from flowing through the bypass circuit including the transistor Q1 and the resistor R5 to prevent the voltage applied to the capacitor unit 1 from becoming excessive with respect to the rated voltage. Therefore, a voltage exceeding each rated voltage is not applied to any of the capacitor units 1 connected in series, so that each capacitor unit 1 can be charged to the full rated value without incurring damage to the capacitor due to overcharging. It has become.

Next, in the outer case inner lid 3b fixed to the outer case main body 3a, such a charge limiting circuit M is provided.
After attaching one printed circuit board 6 on which C is mounted, the printed circuit board 6 is attached to the aluminum outer case upper lid 3c which has _one small-diameter vent hole 3c1 and also functions as a heat sink. By screwing to cover,
An electric double-layer capacitor bank whose external appearance is shown in FIG. 7, in which ten capacitor units 1 are housed in a rectangular outer case 3 including an outer case main body 3a, an outer case inner cover 3b, and an outer case upper cover 3c, is assembled. In addition,
The external dimensions of the high-voltage large-capacity electric double-layer capacitor bank having a rated voltage of 3.5 V and a capacity of 300 F in this example have a width of 1
It is about 00 mm × length 270 mm × height 120 mm.

As described above, in this example, the positive electrode 11 and the negative electrode 12 are each provided with a separator 16 between them.
Are stacked alternately, and ten rectangular capacitor units 1 formed by connecting the respective cells in parallel are accommodated in a rectangular outer case 3 by impregnation with an electrolytic solution, and these capacitor units 1 are connected in series. While a positive external terminal 7a and a negative external terminal 7b of a combined capacitor circuit configured by being connected are provided, a charge limiting circuit MC that limits charging when the terminal voltage of each capacitor unit 1 reaches a rated voltage during charging is provided. An electric double-layer capacitor bank in which the mounted printed circuit board 6 is provided in the outer case 3 is assembled. As described above, the electric double layer capacitor bank according to the present invention accommodates the capacitor unit 1 in the outer case 3 in which the inexpensive bag-shaped insulator 2 is mounted without being incorporated in the case instead of the conventional single-unit type with the case. And a capacitor bank,
A square case for each capacitor unit 1 is not required, and a troublesome case-incorporating operation for attaching a case to each individual unit is unnecessary, which is cheaper and lighter than conventional products.

Further, in the electric double layer capacitor bank according to the present invention, one printed circuit board 6 on which the charge limiting circuit MC is mounted is provided in the outer case 3 so that the rated voltage of each capacitor unit 1 is reduced during charging. Even if there is a variation, no voltage exceeding the rated voltage is applied to any one of the capacitor units 1, so that each capacitor unit 1 does not break due to overcharging.
Each can be charged up to the full rating. Furthermore, a bag-shaped diaphragm chamber 4 and a safety valve 5
The safety is extremely high because of the double safety device consisting of

[0037]

As described above, the electric double-layer capacitor bank according to the present invention includes an electric double-layer capacitor unit in a rectangular outer case, which is not a single unit type with a case but a case in which the case is not assembled. It is configured to house a plurality. Therefore, a square case for each electric double layer capacitor unit is not required, and a troublesome work of assembling a case for attaching a case to each conventional unit is unnecessary. That is, according to the present invention, it is possible to provide an inexpensive electric double layer capacitor bank as compared with conventional products.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an electric double layer capacitor unit of an electric double layer capacitor bank according to the present invention.

FIG. 2 is an explanatory diagram of a configuration of an electrode laminate in the electric double layer capacitor unit shown in FIG.

FIG. 3 shows the electric double-layer capacitor unit shown in FIG.
It is a perspective view which shows the state which attached the bag-shaped insulator after impregnating this with the electrolytic solution.

FIG. 4 is a diagram related to the electric double layer capacitor bank of the present invention, and is a perspective view showing a state in which a plurality of electric double layer capacitor units are attached to an outer case inner lid.

FIG. 5 is a perspective view showing an outer case body of the electric double layer capacitor bank according to the present invention.

FIG. 6 shows an electric double layer capacitor bank according to the present invention;
FIG. 2 is a perspective view illustrating a schematic appearance of a printed circuit board on which a charge limiting circuit is mounted.

FIG. 7 is a perspective view showing an appearance of an electric double layer capacitor bank according to the present invention.

FIG. 8 is a plan view showing the electric double layer capacitor bank according to the present invention in a state where the outer case upper cover and the printed circuit board are removed.

FIG. 9 is a sectional view taken along line AA of FIG. 8;

FIG. 10 is a sectional view taken along line BB of FIG. 8;

FIG. 11 is a diagram showing an example of an electric circuit configuration of an electric double layer capacitor bank according to the present invention.

FIG. 12 is a circuit diagram illustrating an example of a charge limiting circuit of FIG. 11;

FIG. 13 is a diagram illustrating an example of a conventional electric double layer capacitor bank.

14 is a perspective view showing a configuration example of a multilayer electric double layer capacitor constituting the capacitor bank of FIG. 13 with a part thereof cut away.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric double layer capacitor unit 2 ... Bag-shaped insulator 3 ... Outer case 3a ... Outer case main body 3a
₁ ... in the partition plate 3b ... outer case lid 3b ₁ ... cap portion 3b ₂ ... gas vent hole 3c ... exterior case lid 3
c ₁ ... gas vent hole 4 ... bag-shaped diaphragm chamber 4 b ... bag body 4 a ... small-diameter cylindrical body 5 ... safety valve 5 a ... gas vent hole 5 b ... compression coil spring 6 ... printed circuit board 6 a ... aluminum heat sink 7 ... external terminal block 7 a ... Positive electrode external terminal 7b ... Negative electrode external terminal 8 ... Top cover mounting screw, 11 ... Positive electrode 12 ... Negative electrode 13 ...
Positive electrode collector 14 ... Negative electrode collector 15 ... Polarizable electrode 16 ... Separator 17 ... Pressing plate 18a ... Positive electrode connection terminal 18b ... Negative electrode connection terminal MC ... Charge limiting circuit

[Procedure amendment]

[Submission date] January 19, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0034

[Correction method] Change

[Correction contents]

Next, in the outer case inner lid 3b fixed to the outer case main body 3a, such a charge limiting circuit M is provided.
After attaching one printed circuit board 6 on which C is mounted, the printed circuit board 6 is attached to the aluminum outer case upper lid 3c which has _one small-diameter vent hole 3c1 and also functions as a heat sink. By screwing to cover,
An electric double-layer capacitor bank whose external appearance is shown in FIG. 7, in which ten capacitor units 1 are housed in a rectangular outer case 3 including an outer case main body 3a, an outer case inner cover 3b, and an outer case upper cover 3c, is assembled. In addition,
The external dimensions of a high-voltage, large-capacity electric double-layer capacitor bank having a rated voltage of 35 V and a capacity of 300 F in this example have a width of 10
It is about 0 mm × length 270 mm × height 120 mm.

Claims (2)

[Claims] 1. A plurality of positive electrodes comprising a polarizable electrode mainly composed of activated carbon and a positive electrode collector, and a plurality of negative electrodes comprising a polarizable electrode mainly composed of activated carbon and a negative electrode collector. A rectangular electric double layer capacitor unit formed by alternately stacking cells constituted by a positive electrode and a negative electrode adjacent to each other with the separator interposed therebetween, and impregnated with an electrolytic solution. A plurality of electric double layer capacitor units are housed in an outer case, and a positive external terminal and a negative external terminal of a composite capacitor circuit configured by connecting the plurality of electric double layer capacitor units are provided. A printed circuit board on which a charge limiting circuit for limiting charging when a terminal voltage of the battery reaches a predetermined value is provided in the outer case. Air double layer capacitor bank. 2. A bag-shaped diaphragm chamber that contracts and expands and deforms in accordance with the internal pressure of the external case,
2. A safety valve for discharging a pressure inside the outer case equal to or higher than a predetermined value to the outside of the outer case.
The electric double layer capacitor bank as described.