JP2009164468A - Electric double-layer capacitor module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lower resistance by making contact resistance between a terminal for a positive electrode and a terminal for a negative electrode small as much as possible, when a plurality of electric double-layer capacitors are connected in series. <P>SOLUTION: An electrolyte is encapsulated in a capacitor body 11 which is made by coating a capacitor element with a laminate film, and the terminal 12 for positive electrode and the terminal 13 for negative electrode are lead out from the capacitor body 11 to make the plurality of electric double-layer capacitors C<SB>1</SB>-C<SB>4</SB>, and they are connected in series to produce a module. The electric double-layer capacitors C<SB>1</SB>-C<SB>4</SB>are placed side by side in plane view and housed in a case 10, and the terminal 12 for positive electrode of one electric double-layer capacitors C<SB>2</SB>-C<SB>4</SB>and the terminal 13 for negative electrode of the other electric double-layer capacitors C<SB>1</SB>-C<SB>3</SB>adjoining to each other are electrically connected by welding. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is an electric double layer capacitor having a large storage capacity used as a power source for an instantaneous voltage drop countermeasure device (instantaneous voltage drop countermeasure device) that compensates for an instantaneous voltage drop that affects a production line such as a factory due to a lightning strike, for example. Regarding modules.

  For example, an electric double-layer capacitor (capacitor) with a large storage capacity is used as a power source for an instantaneous voltage drop countermeasure device (instantaneous voltage drop countermeasure device) that compensates for an instantaneous voltage drop that affects production lines such as lightning. Has been. This electric double layer capacitor has a capacitor element in which a sheet-like positive electrode body and a negative electrode body, each having active carbon as a main component, are alternately laminated via an insulating sheet-like separator, and is covered with an exterior material. It has a structure in which an electrolyte is sealed inside the material.

  This type of electric double layer capacitor is broadly divided into a laminated type in which the above-described capacitor element is formed into a flat plate shape and a wound type in which the capacitor element is wound in a spiral shape, and an exterior housing the capacitor element. Depending on the form of the material, there are a can case type using a metal case and a laminate type using a laminate film. In particular, a laminated type laminated type is used for increasing the capacity, increasing the space factor, and reducing the weight of the electric double layer capacitor (see, for example, Patent Document 1).

  This electric double layer capacitor includes a rectangular thin plate capacitor body in which a capacitor element is sandwiched between two laminate films. The laminate film that surrounds the capacitor element has a three-layer structure in which an aluminum protective layer is sandwiched between layers and an insulating protective layer is stacked on the outer side, and an insulating adhesive layer is stacked on the inner side.

  In this electric double layer capacitor, two laminated films are joined and integrated with the above-mentioned adhesive layer by heat-pressing the overlapping part over the entire circumference, and the capacitor element is bent between the two laminated films. Thus, the electrolytic solution is sealed, and the positive electrode terminal and the negative electrode terminal are led out of the capacitor body through the laminate film from the capacitor element.

  Patent Document 1 discloses an electric double layer capacitor module configured by stacking a plurality of electric double layer capacitors in the thickness direction of the capacitor main body and accommodating them in a case in order to obtain high capacity and high output. ing.

That is, as shown in FIG. 13, the conventional electric double layer capacitor module includes a plurality of electric double layer capacitors 1 that are stacked in the thickness direction of the capacitor body 2 and accommodated in the case 3. 1 is connected in series. Each electric double layer capacitor 1 is juxtaposed in a state in which the positive electrode terminal 4 and the negative electrode terminal 5 led out from the capacitor body 2 are erected in the same direction (vertically upward).
JP 2003-282377 A

  By the way, for example, as disclosed in Patent Document 1, a plurality of electric double layer capacitors 1 are connected in series to be modularized so as to obtain a predetermined voltage. In this type of electric double layer capacitor 1, a material considering the low resistance is selected for the capacitor element so that a large output current can be obtained with a low resistance. In addition, the resistance is reduced by pressing the capacitor body 2 of the electric double layer capacitor 1 superposed in the case 3 along its thickness direction.

  On the other hand, each electric double layer capacitor 1 accommodated in the case 3 has a positive electrode terminal 4 of one electric double layer capacitor 1 adjacent in the thickness direction of the capacitor body 2 (the overlapping direction of the electric double layer capacitor 1). And the negative electrode terminal 5 of the other electric double layer capacitor 1 are arranged to face each other.

  The positive electrode terminal 4 and the negative electrode terminal 5 that face each other are electrically connected, and the positive electrode terminal 4 of one electric double layer capacitor 1 and the negative electrode of the other electric double layer capacitor 1 that are located at the overlapping end portion. The electric double layer capacitors 1 are connected in series by pulling out the service terminals 5 to the outside of the case 3.

  Here, when the positive electrode terminal 4 of one adjacent electric double layer capacitor 1 and the negative electrode terminal 5 of the other electric double layer capacitor 1 are electrically connected, the contact resistance between the terminals is made as small as possible. In order to reduce the resistance, means such as ultrasonic welding or spot welding is preferable.

  However, since the electric double layer capacitor 1 has a thin plate structure with respect to the positive electrode terminal 4 and the negative electrode terminal 5 of each electric double layer capacitor 1 superimposed, the thickness direction of the capacitor body 2 (the electric double layer capacitor 1 The clearance between adjacent terminals in the overlapping direction is very small. Therefore, when electrically connecting the positive electrode terminal 4 of one adjacent electric double layer capacitor 1 and the negative electrode terminal 5 of the other electric double layer capacitor 1, a welding head for ultrasonic welding or spot welding is used. It is difficult to insert and arrange in the clearance between terminals.

  Therefore, in order to electrically connect the positive electrode terminal 4 of one adjacent electric double layer capacitor 1 and the negative electrode terminal 5 of the other electric double layer capacitor 1, the positive electrode terminal 4 and the negative electrode terminal 5 are connected. Are connected by screwing, or are connected by caulking using the connection fitting 6 as shown in FIG. In the case of connection by caulking using the connection fitting 6, since the caulking tool 7 is smaller than the welding head, even if the clearance between adjacent terminals in the thickness direction of the capacitor body 2 is small, the terminal It is easy to insert and arrange the caulking tool 7 in the clearance.

  However, in order to electrically connect the positive electrode terminal 4 of one adjacent electric double layer capacitor 1 and the negative electrode terminal 5 of the other electric double layer capacitor 1, the positive electrode terminal 4 and the negative electrode terminal 5 are connected to each other. If the connection is made by screwing or the connection fitting 6 is used for the connection, the contact resistance between the terminals is large. When the contact resistance between the terminals is thus large, it is difficult to reduce the resistance of the entire electric double layer capacitor module even if the resistance of the capacitor element is reduced.

  Accordingly, the present invention has been proposed in view of the above-mentioned problems, and the object of the present invention is to provide a contact resistance between a positive electrode terminal and a negative electrode terminal when a plurality of electric double layer capacitors are connected in series. It is an object of the present invention to provide an electric double layer capacitor module that can reduce the resistance as much as possible.

  As technical means for achieving the above-mentioned object, the present invention encloses an electrolytic solution in a capacitor body in which a capacitor element is covered with a laminate film, and leads out a positive electrode terminal and a negative electrode terminal from the capacitor body. A module in which a plurality of electric double layer capacitors are connected in series, the electric double layer capacitors are juxtaposed in a plane and accommodated in a case, and the positive electrode terminal of one adjacent electric double layer capacitor and the other electric The negative electrode terminal of the double layer capacitor is electrically connected by welding.

  In the present invention, the electric double layer capacitors are juxtaposed in a plane and accommodated in the case, thereby securing a space for arranging the welding head around the positive electrode terminal and the negative electrode terminal derived from the capacitor body. be able to. As a result, it becomes possible to electrically connect the positive electrode terminal of one adjacent electric double layer capacitor and the negative electrode terminal of the other electric double layer capacitor by welding, and the contact resistance between the positive electrode terminal and the negative electrode terminal As much as possible, it becomes easy to achieve low resistance.

  In addition, when the positive electrode terminal of one adjacent electric double layer capacitor and the negative electrode terminal of the other electric double layer capacitor are electrically connected by welding, the shapes of the positive electrode terminal and the negative electrode terminal are variously changed. Thus, it is possible to form a superposed portion of both terminals and to weld at the superposed portion. Further, without changing the shapes of the positive electrode terminal and the negative electrode terminal, it is also possible to arrange a connection fitting between the two terminals and weld at the overlapping portion of the connection fitting and the terminal.

  The capacitor body in the present invention has a rectangular shape, and the positive electrode terminal and the negative electrode terminal are led out from one side of the capacitor body, and the positive electrode terminal and the negative electrode terminal of each electric double layer capacitor are arranged in the same direction. It is desirable to do.

  Thus, by deriving the positive electrode terminal and the negative electrode terminal from one side of the rectangular capacitor body, the lead terminal for the positive electrode and the negative electrode terminal can be provided in one place, and the positive electrode terminal and the negative electrode terminal Therefore, the necessary minimum sealing portion of the laminate film is obtained. In addition, by arranging the positive electrode terminal and the negative electrode terminal of each electric double layer capacitor in the same direction, the electrical connection work by welding can be performed efficiently.

  It is desirable that the electric double layer capacitor according to the present invention is accommodated in the case in a state where it is erected in the vertical direction, and the positive electrode terminal and the negative electrode terminal of each electric double layer capacitor are arranged facing upward in the vertical direction.

  In this way, the electric double layer capacitor is accommodated in the case in a vertically standing state, and the positive electrode terminal and the negative electrode terminal of each electric double layer capacitor are arranged facing upward in the vertical direction. The electrolyte solution sealed in the laminate film can be prevented from leaking outside from the seal portion of the laminate film from which the terminal and the negative electrode terminal are derived.

  In the present invention, the electric double layer capacitors are juxtaposed in a planar shape and arranged in a plurality of rows in the thickness direction of the capacitor body, and the positive electrode of one electric double layer capacitor located in a different row at both ends of the planar juxtaposition The terminal for negative electrode and the terminal for negative electrode of the other electric double layer capacitor are pulled out to a position where they can be joined by the welding head and polymerized, and the overlapping part of the positive electrode terminal and negative electrode terminal may be electrically connected by welding. Is possible.

  As described above, when a plurality of electric double layer capacitors are juxtaposed in a planar shape and arranged in a plurality of rows in the thickness direction of the capacitor body, one of the two capacitors located in different rows at both ends of the planar arrangement. The positive electrode terminal of the electric double layer capacitor and the negative electrode terminal of the other electric double layer capacitor are pulled out to a position where they can be joined by the welding head and polymerized, so that the overlapping portion of the positive electrode terminal and the negative electrode terminal is electrically connected by welding. Can be connected to each other.

  As a result, even when a plurality of electric double layer capacitors are juxtaposed in a plane and arranged in a plurality of rows in the thickness direction of the capacitor body, contact between the positive electrode terminal and the negative electrode terminal It becomes easy to reduce the resistance as much as possible to reduce the resistance.

  According to the present invention, since the electric double layer capacitors are juxtaposed in a plane and accommodated in the case, a space for arranging the welding head around the positive electrode terminal and the negative electrode terminal derived from the capacitor body is provided. Can be secured. As a result, it becomes possible to electrically connect the positive electrode terminal of one adjacent electric double layer capacitor and the negative electrode terminal of the other electric double layer capacitor by welding, and the contact resistance between the positive electrode terminal and the negative electrode terminal As much as possible, it becomes easy to achieve low resistance.

  As a result, when a plurality of electric double layer capacitors are connected in series, a high performance electric double layer capacitor module that achieves low resistance by reducing the contact resistance between the positive electrode terminal and the negative electrode terminal as much as possible. Can be provided.

  Embodiments of the electric double layer capacitor module according to the present invention will be described in detail below. This electric double layer capacitor module has a structure in which a plurality of electric double layer capacitors are accommodated in a case and the electric double layer capacitors are connected in series.

  The electric double layer capacitor in the following embodiment is a laminated form in which the capacitor element is a rectangular flat plate, and covers and covers the capacitor element by sandwiching the capacitor element with two laminate films as an exterior material that accommodates the capacitor element. It is a laminate type comprising a rectangular thin plate capacitor body in which an electrolytic solution is enclosed.

  The capacitor element has a structure in which a sheet-like positive electrode body and a negative electrode body are alternately laminated via an insulating sheet-like separator, and the positive electrode body is arranged on one surface of the laminate body, and the positive electrode side And the negative electrode body is arranged on the other surface to be the negative electrode side. Each positive electrode body and negative electrode body has a structure in which an active material layer mainly composed of activated carbon is formed on an aluminum current collector. From each side of the capacitor element, each positive electrode body or negative electrode body is attached. The positive electrode terminal and the negative electrode terminal are led out in an electrically connected state.

  Laminate film is a three-layer structure in which an insulating conductive layer is placed on the outside with an aluminum conductive layer sandwiched, and an insulating adhesive layer is placed on the inside. The laminated portion of the laminate film and the other laminate film located on the negative electrode side of the capacitor element are joined by thermal welding over the entire circumference. Accordingly, the capacitor element is accommodated in the laminate film and the electrolytic solution is sealed, and a pair of positive electrode terminal and negative electrode terminal extending from one side of the capacitor element is led out of the laminate film.

  In order to obtain a high capacity and high output, this type of electric double layer capacitor requires a modularized structure in which a plurality of electric double layer capacitors are connected in series to obtain a predetermined voltage. In this electric double layer capacitor, a material with low resistance is selected for the capacitor element so that a large output current can be obtained with low resistance, and the capacitor body of the electric double layer capacitor housed in the case is oriented in the thickness direction. The resistance is reduced by pressurizing along. Also, when connecting a plurality of electric double layer capacitors in series, the electrical connection between the positive electrode terminal of one electric double layer capacitor and the negative electrode terminal of the other electric double layer capacitor is the contact between the terminals. In order to reduce resistance by reducing the resistance as much as possible, it is preferable to perform welding by ultrasonic welding or spot welding.

  Therefore, as an electric double layer capacitor module capable of obtaining a large output current with low resistance, the electric double layer capacitors are juxtaposed in a plane and accommodated in a case, and the positive electrode terminal of one adjacent electric double layer capacitor and the other The negative electrode terminal of the electric double layer capacitor is electrically connected by welding. In this way, a plurality of electric double layer capacitors are connected in series by electrically connecting the positive electrode terminal of one adjacent electric double layer capacitor and the negative electrode terminal of the other electric double layer capacitor. It is modularized so as to obtain a high voltage and a high output electric double layer capacitor module.

The electric double layer capacitor module according to the first embodiment shown in FIGS. 1 to 3 includes a plurality of (for example, four in the figure) electric double layer capacitors C _{1 to} C ₄ arranged in a plane in the vertical direction. In an upright state, the case 10 is housed in a row in a row, and the positive electrode terminal 12 and the negative electrode terminal 13 led out from one side of the capacitor body 11 of each electric double layer capacitor C _{1 to} C ₄ are arranged in the same direction (vertical). (Upward in the direction).

In the first embodiment, the positive electrode terminal 12 of one of the adjacent electric double layer capacitors C _{2 to} C ₄ and the negative electrode terminal 13 of the other electric double layer capacitor C _{1 to} C ₃ are connected to each other in a strip-shaped connection fitting. 14 is electrically connected via welding. Of the two electric double layer capacitor C _1, C ₄ positioned at both ends in the case 10, one of the electric double layer negative electrode terminal 13 of the capacitor C for the positive electrode terminal 12 of _one and the other of the electric double layer capacitor C ₄ is Although not shown, it is drawn out of the case 10 as a lead-out terminal.

In addition, in the electric double layer capacitors C _{1 to} C ₄ , a material that takes low resistance into consideration is selected for the capacitor element so that a large output current can be obtained with low resistance. The resistance is reduced by pressing the capacitor body 11 of the electric double layer capacitors C _{1 to} C ₄ along its thickness direction.

The electrical connection between the positive electrode terminal 12 of one of the adjacent electric double layer capacitors C _{2 to} C ₄ and the negative electrode terminal 13 of the other electric double layer capacitor C _{1 to} C ₃ is shown in FIGS. It is performed in the manner shown in.

First, arranged so as to straddle the connection fitting 14 between one of the electric double layer capacitor C ₂ positive electrode terminal 12 of the -C ₄ and the other of the electric double layer capacitor C ₁ -C negative electrode terminals 13 of the _three adjacent . Then, a welding head 15 such as ultrasonic welding or spot welding is disposed so as to correspond to the overlapping portion between the end of the connection fitting 14 and the positive electrode terminal 12 and the negative electrode terminal 13. The welding head 15 welds the overlapping portion of the end portion of the connection fitting 14 to the positive electrode terminal 12 and the negative electrode terminal 13, so that the positive electrode terminal 12 of one of the adjacent electric double layer capacitors C _{2 to} C ₄ is welded. And the negative electrode terminal 13 of the other electric double layer capacitors C _{1 to} C ₃ are electrically connected via a connection fitting 14.

  The welding head 15 includes a base portion 15a disposed on the positive electrode terminal 12 and the negative electrode terminal 13 side, and a head portion 15b disposed on the connection fitting 14 side, and the end of the connection fitting 14 and the positive electrode terminal 12 are provided. Further, the overlapped portion with the negative electrode terminal 13 is sandwiched between the base portion 15a and the head portion 15b to weld the overlapped portion. Due to its structure, the welding head 15 requires a larger space on the head portion 15b side than on the base portion 15a side. It is also possible to arrange the base portion 15a of the welding head 15 on the connection fitting 14 side and the head portion 15b on the positive electrode terminal 12 and negative electrode terminal 13 side.

In the electric double layer capacitor module according to the first embodiment, the electric double layer capacitors C _{1 to} C ₄ are arranged side by side in a plane, so that the periphery of the positive electrode terminal 12 and the negative electrode terminal 13 derived from the capacitor body 11 is obtained. Thus, a space for arranging the welding head 15 can be secured. As a result, it is possible to electrically connect the positive electrode terminal 12 of one of the adjacent electric double layer capacitors C _{2 to} C ₄ and the negative electrode terminal 13 of the other electric double layer capacitor C _{1 to} C ₃ by welding. It becomes easy to reduce the resistance by reducing the contact resistance between the positive electrode terminal 12 and the negative electrode terminal 13 as much as possible.

In the first embodiment, the connection fitting 14 is arranged between the terminals 12 and 13 and welded at the overlapping portion of the connection fitting 14 and the terminals 12 and 13. When the positive electrode terminal 12 of the multilayer capacitors C _{2 to} C ₄ and the negative electrode terminal 13 of the other electric double layer capacitors C _{1 to} C ₃ are electrically connected by welding, the positive electrode terminal 12 and the negative electrode terminal 13 are connected. By changing the shape variously, it is possible to form overlapping portions of both terminals 12 and 13 and to weld at the overlapping portions. In this case, the connection fitting 14 becomes unnecessary, and the number of parts can be easily reduced.

In each of the electric double layer capacitors C _{1 to} C ₄ , the positive electrode terminal 12 and the negative electrode terminal 13 are derived by deriving the positive electrode terminal 12 and the negative electrode terminal 13 from one side of the rectangular capacitor body 11. However, the number of the sealing portions of the laminate film from which the positive electrode terminal 12 and the negative electrode terminal 13 are led out is minimized. In addition, as the electric double layer capacitor module, the positive electrode terminals 12 and the negative electrode terminals 13 of the plurality of electric double layer capacitors C _{1 to} C ₄ are arranged in the same direction, whereby electrical connection by welding is performed. Can be done efficiently.

Further, in this electric double layer capacitor module, the electric double layer capacitors C _{1 to} C ₄ are accommodated in the case 10 in a state where they are erected in the vertical direction, and the positive terminal 12 of each electric double layer capacitor C _{1 to} C ₄ is stored. And the negative electrode terminal 13 arranged vertically upward, the electrolyte solution enclosed in the laminate film leaks out from the seal portion of the laminate film from which the positive electrode terminal 12 and the negative electrode terminal 13 are derived. Can be prevented.

In the first embodiment described above, the case where the four electric double layer capacitors C _{1 to} C ₄ are arranged in a single row in a plane (column: horizontal direction) is illustrated, but the present invention is not limited thereto. Without being limited, it is also possible to adopt a configuration as in the second embodiment shown in FIGS. The same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and redundant description is omitted.

The electric double layer capacitor module according to the second embodiment shown in FIGS. 5 to 7 includes eight electric double layer capacitors C _{1 to} C ₈ arranged side by side in a plane and standing in the vertical direction. Are housed in one row and two rows (four rows and one row, upper and lower two rows), and are connected to the positive electrode terminal 12 and the negative electrode terminal derived from one side of the capacitor body 11 of each of the electric double layer capacitors C _{1 to} C _8. 13 is arranged in the same direction (vertically upward).

In this second embodiment, the positive electrode terminal 12 of one of the adjacent electric double layer capacitors C _{2 to} C ₈ and the negative electrode terminal 13 of the other electric double layer capacitor C _{1 to} C ₇ are connected to the fittings 14 and 14a. And electrically connected by welding. Since the connection between the positive electrode terminal 12 and the negative electrode terminal 13 is the same as that shown in FIGS. 4A and 4B in the first embodiment, the description thereof is omitted.

In the second embodiment, the negative electrode terminal 13 of one electric double layer capacitor C ₄ located in the upper stage is electrically connected to the positive electrode terminal 12 of the other electric double layer capacitor C ₅ located in the lower stage. There is a need to. In order to connect the negative electrode terminal 13 and the positive electrode terminal 12 of these two electric double layer capacitors C ₄ and C ₅ , a U-shaped connection fitting 14 a is used.

Of the two electric double layer capacitors C ₁ and C ₈ located at one end in the case 10, the positive electrode terminal 12 of _one electric double layer capacitor C ₁ located at the upper stage and the other electricity located at the lower stage. Although not shown, the negative electrode terminal 13 of the double layer capacitor C ₈ is drawn out of the case 10 as a lead terminal.

Also in the electric double layer capacitor module according to the second embodiment, the welding head 15 is arranged around the positive electrode terminal 12 and the negative electrode terminal 13 by arranging the electric double layer capacitors C _{1 to} C ₈ in a plane. Space can be secured, the positive electrode terminal 12 and the negative electrode terminal 13 can be electrically connected by welding, and the contact resistance between the terminals 12 and 13 is made as low as possible to reduce the resistance. Easy to plan.

Further, in each of the electric double layer capacitors C _{1 to} C ₈ , since the lead-out portion of the positive electrode terminal 12 and the negative electrode terminal 13 is only required at one place on one side of the capacitor body 11, the positive electrode terminal 12 and the negative electrode terminal 13 are used. Therefore, the necessary minimum sealing portion of the laminate film is obtained. Further, as the electric double layer capacitor module, by arranging the positive electrode terminals 12 and the negative electrode terminals 13 in the same direction, the electrical connection work by welding can be efficiently performed.

Further, in this electric double layer capacitor module, the electric double layer capacitors C _{1 to} C ₈ are accommodated in the case 10 in a state where they are erected in the vertical direction, and the positive terminal 12 of each electric double layer capacitor C _{1 to} C ₈ is stored. And the negative electrode terminal 13 arranged vertically upward, the electrolyte solution enclosed in the laminate film leaks out from the seal portion of the laminate film from which the positive electrode terminal 12 and the negative electrode terminal 13 are derived. Can be prevented.

  Also in this second embodiment, it is possible to form the overlapping portions of the terminals 12 and 13 by variously changing the shapes of the positive electrode terminal 12 and the negative electrode terminal 13 and to weld at the overlapping portions. is there. In this case, the connection fittings 14 and 14a are unnecessary, and the number of parts can be easily reduced.

In the first embodiment and the second embodiment described above, a case where a plurality of electric double layer capacitors C _{1 to} C ₈ are arranged side by side in a one-row, one-stage arrangement and a one-row, two-stage arrangement is described. However, the present invention is not limited to this, and can be configured as in the third embodiment shown in FIGS. The same parts as those in FIGS. 1 to 7 are denoted by the same reference numerals, and redundant description is omitted.

The electric double layer capacitor module according to the third embodiment shown in FIGS. 8 to 10 includes 24 electric double layer capacitors C _{1 to} C ₂₄ arranged side by side in a plane, and a plurality of rows (in the thickness direction of the capacitor body 11 ( For example, the positive electrode is disposed in the case 10 in a state where it is arranged over 8 rows in the figure and is erected in the vertical direction, and is derived from one side of the capacitor body 11 of each of the electric double layer capacitors C _{1 to} C _24. And the negative electrode terminal 13 are arranged in the same direction (vertically upward). That is, in this electric double layer capacitor module, three electric double layer capacitors C _{1 to} C ₂₄ are arranged in one row, and the three electric double layer capacitors C _{1 to} C ₂₄ are connected to the capacitor main body 11. Are arranged in 8 rows in the thickness direction.

In this third embodiment, the positive electrode terminal 12 of one of the adjacent electric double layer capacitors C _{2 to} C ₂₄ and the negative electrode terminal 13 of the other electric double layer capacitor C _{1 to} C ₂₃ are connected to the fittings 14 and 14b. And electrically connected by welding.

Specifically, among the three electric double layer capacitors C _{1 to} C ₂₄ arranged in the column direction (horizontal direction), the electric double layer capacitors C ₂ , C ₅ , C ₈ , C ₁₁ , C ₁₂ , C ₁₇ , C ₂₀ , C ₂₃ positive electrode terminal 12 and electric double layer capacitors C ₁ , C ₄ , C ₇ , C ₁₀ , C ₁₃ , C ₁₆ , C ₁₉ , C adjacent to the terminal 12 in the column direction. ₂₂ are connected to the negative electrode terminal 13 by the connecting metal fitting 14 and the electric double layer capacitors C ₂ , C ₅ , C ₈ , C ₁₁ , C ₁₄ , C ₁₇ , C ₂₀ , C ₂₃ are located in the center. The negative electrode terminal 13 and the electric double layer capacitors C ₃ , C ₆ , C ₉ , C ₁₂ , C ₁₅ , C ₁₈ , C ₂₁ , and C ₂₄ positive electrode terminals 12 adjacent thereto in the column direction are connected to the metal fitting 14. Connect it electrically.

Since the connection of both the terminals 12 and 13 by welding is the same as the procedure of FIGS. 4A and 4B in the first embodiment, the description thereof is omitted, but the welding operation is performed in three rows and one row. Before the electric double layer capacitors C _{1 to} C ₂₄ are arranged in eight rows in the thickness direction of the capacitor main body 11, that is, in the state of three in one row, this is performed individually in advance.

Of the three electric double layer capacitors C _{1 to} C ₂₄ arranged in the column direction (horizontal direction), electric double layer capacitors C ₂ , C ₅ , C ₈ , C ₁₁ , C ₁₄ , C ₁₇ located in the center are arranged. , C ₂₀ , C ₂₃ , one electrical double layer capacitor C ₄ , C ₇ , C ₁₀ , C ₁₃ , C ₁₆ , C ₁₉ , C ₂₂ positive terminal 12 and the other When the negative electrode terminals 13 of the multilayer capacitors C ₃ , C ₆ , C ₉ , C ₁₂ , C ₁₅ , C ₁₈ , and C ₂₁ are electrically connected by welding with the connection fitting 14b, the following procedure is performed. 11 is a partially enlarged view of a portion X in FIG. 10, and FIG. 12 is a partially enlarged view of a portion Y in FIG.

As shown in FIGS. 11 and 12, one of the electric double layer capacitors C ₄ , C ₇ , C ₁₀ , C ₁₃ , C ₁₆ , C ₁₉ , C _{22 is connected to} the positive electrode terminal 12 and the other electric double layer capacitor. In order to pull out the negative electrode terminal 13 of C ₃ , C ₆ , C ₉ , C ₁₂ , C ₁₅ , C ₁₈ , C ₂₁ to a position where the welding head 15 can be joined, it is connected to the positive electrode terminal 12 and the negative electrode terminal 13. The metal fittings 14b are connected by welding so as to project in the row direction (horizontal direction).

The welding operation for connecting one end of the connection fitting 14b to the positive electrode terminal 12 and the negative electrode terminal 13 is performed by connecting three electric double layer capacitors C _{1 to} C ₂₄ in eight rows in the thickness direction of the capacitor body 11. Prior to the placement, that is, in the state of three rows and one row, it is performed individually in advance.

Then, three one column of the electric double-layer capacitor C ₁ -C ₂₄ in a state of being arranged in eight rows in the thickness direction of the capacitor body 11, the two one electrical located in different rows layer capacitor C _4, C _7, C ₁₀ , C ₁₃ , C ₁₆ , C ₁₉ , C ₂₂ positive terminal 12 and the other electric double layer capacitors C ₃ , C ₆ , C ₉ , C ₁₂ , C ₁₅ , C ₁₈ , C ₂₁ negative terminal The other end portions of the two connection fittings 14b connected to 13 and projecting in the column direction are connected by welding. In this case, the other end portions of the two connection fittings 14b are bent and superposed so as to be close to each other, and the superposed portions are connected by welding.

Of the two electric double layer capacitors C ₁ and C ₂₄ located at one end in the case 10, the positive electrode terminal 12 of one electric double layer capacitor C _{1 and} the negative electrode terminal of the other electric double layer capacitor C _24. Although not shown, 13 is pulled out of the case 10 as a lead terminal.

  What is necessary is just to perform the welding operation | work of the superimposition part of the other end parts of these two connection metal fittings 14b in the way shown in FIG. 11 and FIG.

First, one electric double layer capacitor C ₄ , C ₇ , C ₁₀ , C ₁₃ , C ₁₆ , C ₁₉ , C ₂₂ positive terminal 12 and the other electric double layer capacitor C ₃ , C in the X part of FIG. ₆ , C ₉ , C ₁₂ , C ₁₅ , C ₁₈ , C ₂₁ are connected to the negative electrode terminals 13 as shown in FIG. , The connection fitting 14b is projected inward in the row direction (right side in the drawing), and welding is performed by sandwiching the overlapped portion between the other ends of the connection fitting 14b between the base portion 15a and the head portion 15b of the welding head 15. .

  At this time, the base portion 15 a of the welding head 15 is disposed inside the capacitor body 11 in the thickness direction, and the head portion 15 b is disposed outside the capacitor body 11 in the thickness direction. Since the welding head 15 requires a larger space on the head portion 15b side than on the base portion 15a side due to its structure, the welding head 15 is disposed by placing the head portion 15b outside the capacitor body 11 in the thickness direction. The connection work by is enabled.

  Further, for the pair of terminals 12 and 13 located in the center of the capacitor body 11 in the thickness direction, the connection fitting 14b is projected outward in the row direction (left side in the figure), and the other ends of the connection fitting 14b are connected to each other. The overlapped portion is welded by being sandwiched between the base portion 15a and the head portion 15b of the welding head 15. In this case, since there is a wide space on both sides of the two connection fittings 14b, the base portion 15a of the welding head 15 is arranged on either side (lower side in the figure) and the other side (upper side in the figure). However, the arrangement of the base portion 15a and the head portion 15b may be opposite to that shown in the figure.

Next, one electric double layer capacitor C ₄ , C ₇ , C ₁₀ , C ₁₃ , C ₁₆ , C ₁₉ , C ₂₂ positive electrode terminal 12 and the other electric double layer capacitor C ₃ , in the Y part of FIG. As shown in FIG. 12, the connection of the negative electrode terminals 13 of C ₆ , C ₉ , C ₁₂ , C ₁₅ , C ₁₈ , and C ₂₁ is performed in two sets of both terminals 12 and 13 positioned in the thickness direction of the capacitor body 11. , The connection fitting 14b is projected inward in the row direction (left side in the figure), and welding is performed by sandwiching the overlapped portion between the other ends of the connection fitting 14b between the base portion 15a and the head portion 15b of the welding head 15. .

  Further, with respect to the remaining two sets of both terminals 12 and 13 located in the thickness direction of the capacitor body 11, the connection fitting 14b is projected outward in the row direction (right side in the figure), and the other ends of the connection fitting 14b are connected to each other. The overlapped portion is welded by being sandwiched between the base portion 15a and the head portion 15b of the welding head 15.

  When these four sets of both terminals 12 and 13 are welded, the base portion 15a of the welding head 15 is arranged on the inner side in the thickness direction of the capacitor body 11, and the welding head 15 is placed on the outer side in the thickness direction of the capacitor body 11 where a wide space exists. A head portion 15b is disposed. In this way, by arranging the head portion 15b of the welding head 15 on the outer side in the thickness direction of the capacitor body 11, connection work by the welding head 15 is enabled.

As described above, when a plurality of electric double layer capacitors C _{1 to} C ₂₄ are juxtaposed in a plane and arranged in a plurality of rows in the thickness direction of the capacitor body 11, at both ends of the plane arrangement. One electric double layer capacitor C ₄ , C ₇ , C ₁₀ , C ₁₃ , C ₁₆ , C ₁₉ , C ₂₂ positive electrode terminal 12 and the other electric double layer capacitor C ₃ , C ₆ , C located in different rows ₉ , C ₁₂ , C ₁₅ , C ₁₈ , C ₂₁ negative electrode terminals 13 were pulled out from the positive electrode terminals 12 and the negative electrode terminals 13 by pulling them out to positions where they can be joined by the welding heads with the connection fittings 14b. It becomes possible to electrically connect by welding with the connection fitting 14b, and it becomes easy to reduce the contact resistance between the positive electrode terminal 12 and the negative electrode terminal 13 as much as possible.

Further, in each of the electric double layer capacitors C _{1 to} C ₂₄ , the lead-out portion of the positive electrode terminal 12 and the negative electrode terminal 13 is only required at one place on one side of the capacitor body 11. Therefore, the necessary minimum sealing portion of the laminate film is obtained. Further, as the electric double layer capacitor module, by arranging the positive electrode terminals 12 and the negative electrode terminals 13 in the same direction, the electrical connection work by welding can be efficiently performed.

Further, in this electric double layer capacitor module, the electric double layer capacitors C _{1 to} C ₂₄ are accommodated in the case 10 in a state where they are erected in the vertical direction, and the positive terminal 12 of each electric double layer capacitor C _{1 to} C ₂₄ is stored. And the negative electrode terminal 13 arranged vertically upward, the electrolyte solution enclosed in the laminate film leaks out from the seal portion of the laminate film from which the positive electrode terminal 12 and the negative electrode terminal 13 are derived. Can be prevented.

  Also in this third embodiment, it is possible to form the overlapping portions of both terminals 12 and 13 by variously changing the shapes of the positive electrode terminal 12 and the negative electrode terminal 13 and to weld at the overlapping portions. is there. In this case, the connection fittings 14 and 14b are unnecessary, and the number of parts can be easily reduced.

  It should be noted that the present invention is not limited to the above-described embodiments, and can of course be implemented in various forms without departing from the gist of the present invention. All equivalents and equivalents of the claims, and all modifications within the scope of the claims are embraced by the claims.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a schematic configuration of an electric double layer capacitor module in which four electric double layer capacitors are arranged in a row in the first embodiment of the present invention. It is a front view of FIG. It is a left view of FIG. It is for demonstrating the point which welds a connection metal fitting to the positive electrode terminal or negative electrode terminal of an electric double layer capacitor with a welding head, (A) is a side view which shows the state before welding, (B) is after welding. It is a side view which shows a state. It is a perspective view which shows schematic structure of the electric double layer capacitor module which comprised the electric double layer capacitor by 2 steps | paragraphs of upper and lower 2 steps | paragraphs arrangement | positioning by 2nd embodiment in this invention. FIG. 6 is a front view of FIG. 5. FIG. 6 is a right side view of FIG. 5. It is a perspective view which shows schematic structure of the electrical double layer capacitor module which comprised the electrical double layer capacitor by 8 rows arrangement | sequence of 3 pieces in 1 row in 3rd embodiment in this invention. It is a front view of FIG. It is a top view of FIG. It is the elements on larger scale which show the X section of FIG. It is the elements on larger scale which show the Y section of FIG. It is a perspective view which shows the prior art example of an electrical double layer capacitor module. It is a side view which shows the example of a connection of the terminal for positive electrodes of the electric double layer capacitor of FIG. 13, and the terminal for negative electrodes.

Explanation of symbols

10 case 11 the capacitor body 12 positive electrode terminal 13 negative electrode terminal 15 the welding head C ₁ -C ₂₄ electric double-layer capacitor

Claims (4)

  A module in which an electrolytic solution is sealed inside a capacitor body in which a capacitor element is covered with a laminate film, and a plurality of electric double layer capacitors, in which a positive electrode terminal and a negative electrode terminal are derived from the capacitor body, are connected in series, The electric double layer capacitors are juxtaposed in a plane and accommodated in a case, and the positive electrode terminal of one adjacent electric double layer capacitor and the negative electrode terminal of the other electric double layer capacitor are electrically connected by welding. Electric double layer capacitor module characterized by   The capacitor body has a rectangular shape, the positive electrode terminal and the negative electrode terminal are led out from one side of the capacitor main body, and the positive electrode terminal and the negative electrode terminal of each electric double layer capacitor are arranged in the same direction. Item 2. The electric double layer capacitor module according to Item 1.   3. The electric double layer capacitor according to claim 1, wherein the electric double layer capacitor is accommodated in a case in a vertically standing state, and a positive electrode terminal and a negative electrode terminal of each electric double layer capacitor are arranged upward in the vertical direction. Electric double layer capacitor module.   The electric double layer capacitors are juxtaposed in a plane and arranged in a plurality of rows in the thickness direction of the capacitor body, and the positive electrode terminal and the other one of the electric double layer capacitors located in different rows at both ends of the plane juxtaposition 4. The negative electrode terminal of the electric double layer capacitor is pulled out and polymerized to a position where it can be joined by a welding head, and the overlapping portion of the positive electrode terminal and the negative electrode terminal is electrically connected by welding. The electric double layer capacitor module according to one item.

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