JP2003163140A - Method for manufacturing electric double layer capacitor cell and its manufacturing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing an electric double layer capacitor cell by automatically stacking, and its manufacturing apparatus. <P>SOLUTION: In the method for manufacturing the electric double layer including a laminate 6 in which an anode, a cathode, and a separator are stacked, a laminating process for stacking the laminate 6 on a band 5 and a bundling process for bundling both ends of the band 5 together are carried out in order. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved method and apparatus for manufacturing an electric double layer capacitor cell.

[0002]

2. Description of the Related Art In recent years, as various power storage devices, attention has been paid to a technique of applying an electric double layer capacitor which can be rapidly charged and has a long charge / discharge cycle life.

An electric double layer capacitor cell is constructed by alternately stacking the same number of positive electrode bodies and negative electrode bodies with a separator interposed therebetween (see Japanese Patent No. 3005992 and Japanese Patent Laid-Open No. 7-94374). .

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a manufacturing method for automatically stacking electric double layer capacitor cells and a manufacturing apparatus therefor, while taking into consideration the conventional technique of such electric double layer capacitors. .

[0005]

According to a first aspect of the present invention, there is provided a method of manufacturing an electric double layer capacitor cell comprising a laminated body in which a positive electrode body, a negative electrode body and a separator are laminated, and a laminating step of laminating the laminated body on a band. And the binding step of binding both ends of the band together.

A second invention is an electric double layer capacitor cell manufacturing apparatus comprising a laminated body of a positive electrode body, a negative electrode body and a separator, and a laminating mechanism for laminating the laminated body on a strip,
A binding mechanism for binding both ends of the band together is provided.

In a third aspect based on the second aspect, as a laminating mechanism, a base on which the strip and the laminated body are placed, a suction plate for adsorbing and supporting the strip on the base, and a positioning mechanism surrounding the laminated body to be laminated. And with.

In a fourth aspect based on the third aspect, as a positioning mechanism, an elevating set pin projecting so as to be retractable from the base is provided, and the elevating set pin is pulled in when the strip is placed on the base, After being sucked and supported by the suction plate, it is configured to project on the base and bend the band.

A fifth invention is, in the third or fourth invention, provided with a moving table for moving the plurality of bases to a stacking work position or a bundling work position.

In a sixth aspect of the present invention according to any one of the second to fifth aspects of the present invention, as a binding mechanism, a clamper for pressing the laminated body, and a pair of winding rollers for winding both ends of the belt and matching them together are provided. And a heat seal for welding both ends of the.

[0011]

In the first aspect of the present invention, by stacking the double-layer capacitor cells and then bundling them with a band, the stacked body can be stacked with high precision,
You can increase productivity.

In the second aspect of the invention, the work of stacking and binding the laminated body by the manufacturing apparatus can be automated, and the manufacturing line including the manufacturing apparatus is housed in the glove box, so that the electric double layer capacitor cell is exposed to the outside air. It is possible to manufacture without exposing it to heat, and the quality is stabilized.

In the third aspect of the present invention, the suction plate supports the band by suction on the base to hold the band at a predetermined position, and the positioning mechanism is used to accurately stack the stack on the band. it can.

In the fourth aspect of the present invention, the lifting / lowering set pin projects above the base after the band is suction-supported by the suction plate, so that the band can be held at a predetermined position and bent.

In the fifth aspect of the invention, when one of the bases is in the stacking work position, the other base is in the bundling work position, so that the stacking work and the bundling work can be performed in parallel, and the productivity is improved. .

In the sixth invention, after the laminated body is pressed by the clamper, the heat seal is pressed against both ends of the band by the winding roller while being further pressed by the clamper. Are joined by welding. At this time, if the clamper is interposed between the welded portion of the strip and the electrode sheet, the electrode sheet is protected, and the pressing force by heat sealing is made uniform, so that the welding is performed reliably.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, the electric double layer capacitor cell has the same number of positive electrode bodies 1a and negative electrode bodies 1b and one of them.
The two-fold separator 4 sandwiching each one is laminated. In the electric double layer capacitor, the laminated body 6 of the electric double layer capacitor cell is housed in an airtight container together with the electrolytic solution.

The positive electrode body 1a and the negative electrode body 1b are the collector electrode 2
The same electrode sheet 1 is provided with polarizable electrodes 3 on both surfaces. The electrode sheet 1 is composed of a collecting electrode 2 and an activated carbon electrode 3 (polarizable electrode) which is polymerized on both surfaces thereof. The collector electrode 2 is made of a rectangular metal foil (for example, aluminum foil), and a strip-shaped lead portion 2a is integrally formed on one side of the rectangular plane so as to be closer to one side.

The separator 4 sandwiching the electrode sheet 1 is
A dough (made of a resin or paper porous film such as Teflon (registered trademark) or polypropylene) is folded into two. The electrode sheet 1 is inserted inside the separator 4 and positioned with reference to the folded line 4a. The half-folded separator 4 is a lead 2 a of the collector electrode 2.
While exposing a part (tip side) of the electrode sheet 1, both sides (polarizable electrode 3) of the electrode sheet 1 are covered and three sides (two sides orthogonal to the bending line 4a and one side parallel to the bending line 4a) are surrounded. ), A margin of a predetermined width (a portion where half surfaces overlap each other) is generated, and the size (developed area) is set.

As shown in FIG. 1, even-numbered electrode sheets 1 (the same number of positive electrode bodies and negative electrode bodies) are folded into two separators 4 one by one.
It is sandwiched between and is constituted by a predetermined number of laminated bodies 6 (electric double layer capacitor cells). In the electrode sheet 1, the lead portions 2a of the positive electrode body are alternately inverted so that the lead portions 2a of the positive electrode body are arranged on one side of one side of the collector electrode 2 and the lead portion 2a of the negative electrode body in relation to the lead portions 2a which are closer to one side of the collector electrode 2. The parts 2a are assembled in a laminated state in which they are arranged on the opposite side. The lead portions 2a of the collecting electrode 2 are bound together with the same poles, and inside the container, binding portions (overlapping portions of the lead portions 2a) of polarities respectively corresponding to a pair of terminals are joined.

With such a structure, the electrode sheet 1 can be positioned with respect to the folding line 4a in the bi-folded separator 4. For example, a bi-folded separator 4 that sandwiches the electrode sheet 1 may be formed by bending the bent line 4a.
When stacking or the like is performed in a vertically placed state in which is a horizontal lower side, the bending line 4a of the bi-fold separator 4 regulates the position of the electrode sheet 1. Therefore, in the manufacturing process, thin products (the positive electrode body 1a and the negative electrode body) are 1b and the separator 4 interposed between them are prevented from being displaced.

If a deviation occurs between the positive electrode body 1a and the negative electrode body 1b and the separator 4, the insulation between the positive electrode body 1a and the negative electrode body 1b becomes incomplete and there is a possibility that a short circuit occurs.
In this respect, the double-folded separator 4 can easily prevent the displacement between the positive electrode body 1a and the negative electrode body 1b, and greatly improve the yield of products (electric double layer capacitors). Further, regarding the positive electrode body 1a and the negative electrode body 1b,
Since the same electrode sheet 1 is shared, the effect of significantly reducing the manufacturing cost of these is also obtained.

FIG. 2 shows another embodiment (configuration of the laminated body 6).
The half-folded separator 4 is attached to only one of the positive electrode body 1a and the negative electrode body 1b. The electrode sheet 1 is sandwiched between the half-folded separators 4 every other layered body 6, and the activated carbon electrodes 3 of each positive electrode body 1a are sandwiched.
The half surface of the separator 4 is folded in half between each of the negative electrode bodies 1b and the activated carbon electrodes 3 (insulation between a pair of activated carbon electrodes).

In this case, the half-folded separator 4 is halved as compared with the example of FIG. 3 (where the half-folded separator 4 is assembled to all the electrode sheets 1 constituting the laminated body 6). Regarding the positioning of the double-folded separator 4, its function is halved, but the overlapping of the half-faces of the double-folded separator 4 is eliminated, and the thickness of the electric double layer capacitor cell is reduced and the electric double layer capacitor is made compact. The capacitance of the capacitor cell can be increased.

FIG. 3 is a view for explaining a manufacturing process (a part) of the electric double layer capacitor. (A) to (c) are processes for manufacturing the electrode sheet 1, and (d) to (f) are folded in two. Of manufacturing the separator 4 of FIG.
Represents a step of sandwiching (assembling) with the separator 4 folded in half.

In (a), 10 is a sheet processed into the electrode sheet 1, which is wound around a roll and conveyed. The sheet 10 is coated with paste-like activated carbon (a mixture containing a binder) as a constituent material of the polarizable electrode 3 on both sides of a metal foil (a constituent material of the collector electrode 2) or is formed into a plate-like activated carbon ( It is manufactured by laminating a mixture containing a binder). In (b), the sheet 10 is stretched from a roll, and the sheet 11 having a predetermined size (size) is obtained.
Be cut by. In (c), the sheet 11 having a predetermined size is die-cut by a press to form the electrode sheet 1 having a predetermined shape (the lead portion 2a of the collecting electrode 2 is provided on one side of a rectangular plane). In addition, in (b) and (c), 12 is an exposed part which becomes a formation region of the lead part 2a of the collecting electrode 2 on one side (both sides) of the metal foil, and is set on the sheet 10 in (a). .

In (d), the material of the separator 4 (made of a resin or paper porous film such as Teflon (registered trademark) or polypropylene) is cut into a predetermined size. In (e), the cloth 13 having a predetermined size is
A predetermined folding line 4a (dividing the length of the cloth 4 into two equal parts) is formed on the half-folded separator 4.

In (f), the separator 4 is folded in two.
The folding portion 4c is provided with a bending line 4b that is orthogonal to the bending line 4a. The folded portions 4c are formed on two sides of the separator 4 (the cloth 13 having a predetermined size) that is folded in two and intersects one side formed by the folding line 4a.

In (g), the separator 4 (f) is assembled to the electrode sheet 1 (c). Electrode sheet 1
Is inserted into the separator 4 from one side that is open (without bending).

Through these steps, the positive electrode body 1a and the negative electrode body 1b are easily and efficiently formed on the electrode sheet 1 having a predetermined shape by stamping the sheet 10. Since the folded-back portion 4c is added to the double-folded separator 4, the folded-back line 4a and the folded-back portion 4 of the double-folding are added.
The electrode sheet 1 can be positioned vertically and horizontally in two directions based on the folding line 4b of c, and deviations between the thin materials (the positive electrode body and the negative electrode body and the separator 4 positioned between them) can be prevented appropriately. .

FIG. 4 is an explanatory view showing a manufacturing process for laminating the electrode sheets 1, which is folded through the respective steps of to.

In and, the step of laminating the electrode sheet 1 on the strip 5 is performed.

In step (1) and (2), the process of binding the laminated body 6 of the electrode sheet 1 by aligning both ends of the strip 5 is performed.

Next, FIGS. 5 to 8 show a manufacturing apparatus for automatically laminating the electrode sheets 1. This manufacturing apparatus includes a laminating mechanism 3 for laminating the electrode sheet 1 at a predetermined position on the strip 5.
0 and the both ends of the strip 5 are joined together to form a laminate 6 of the electrode sheet 1.
And a bundling mechanism 41 for bundling.

The laminating mechanism 30 includes the strip 5 and the electrode sheet 1.
A pair of bases 21 on which the sheet 5 is placed, a suction plate 27 that suction-supports the strip 5 on the base 21, and a positioning mechanism 20 that surrounds the electrode sheets 1 to be stacked.

Each base 21 is fixed on the moving table 22. The movable table 22 is supported so as to be capable of moving up and down with respect to the main body 23 via a table lifter 24, and the rotary actuator 25 is supported with respect to the table lifter 24.
It is supported rotatably about a vertical axis via. Each base 21 is provided at a position symmetrical with respect to the rotation center axis of the moving table 22. When each base 21 is rotated 180 ° from the stacking work position where the electrode sheets 1 are stacked,
The band 5 moves to a bundling work position where bundling is performed. As a result, when one base 21 is in the stacking work position, the other base 21 is in the bundling work position, and the stacking work and the bundling work are performed in parallel.

The suction plate 27 is made of a porous material, and the negative pressure from the suction pump is introduced through a pipe (not shown) so that the belt 5 is brought into contact with and suction-supported.

A pair of pedestals 28 extending on a horizontal plane are fixed to the main body 21. Each pedestal 28 is arranged so as to sandwich the base 21 at the stacking work position therebetween. With the base 21 held at the same height as the pedestal 28 by the table lifter 24 at the stacking work position, the pedestal 2 is held flat with the belt 5 via a robot hand (not shown).
8 and the base 21 are placed at predetermined positions, and are suction-supported by the suction plate 27.

The positioning mechanism 20 is provided with four lifting set pins 32 protruding from the base 21 so as to be retractable, two fixed set pins 33 and three movable set pins 34.

The four lifting set pins 32 are the electrode sheet 1
Are arranged so as to support both side ends (end portions where the folded-back portions 4c are provided) of the belts via the belts 5. Each lifting set pin 3
2 moves up and down with respect to the base 21 via an actuator 35. Each elevating set pin 32 is drawn into the base 21 when the strip 5 is placed across the pedestal 28 and the base 21, while the strip 5 projects onto the base 21 after being sucked and supported by the suction plate 27. 5 is bent in a U shape.

The two fixed set pins 33 are used for the electrode sheet 1.
It is arranged so as to support the rear end (the end where the bent line 4a is provided). Each fixed set pin 33 is a base 21
Fixed to.

The three movable set pins 34 are electrode sheets 1
Is arranged so as to support the front end (end portion where the lead portion 2a is provided) of. Each movable set pin 34 has a spring 3
It is designed to descend while compressing 6.

The binding mechanism 41 is used for the laminated body 6 of the electrode sheets 1.
It includes a clamper 42 that holds down, a pair of winding rollers 45 that align both ends of the band 5, and a heat seal 61 that welds both ends of the combined band 5.

The clamper 47 is formed of a stainless steel plate in a flat plate shape, and moves up and down via an air cylinder 48.
When the air cylinder 48 contracts while being on the laminated body 6 of the electrode sheet 1, the clamper 47 presses the laminated body 6 of the electrode sheet 1.

The winding rollers 45 are provided so as to face each other with the top of the base 21 at the binding work position sandwiched therebetween, and move on a line that traverses the central portions of the electrode sheet 1 and the strip 5 via the air cylinder 46. ing. The cylinder portion of the air cylinder 46 is fixed on the main body 21.

The electrode sheet 1 is provided between the winding rollers 45.
While being on the laminated body 6, the one air cylinder 46 is expanded, and then the other air cylinder 46 is expanded. As a result, the respective winding rollers 45 are sequentially moved so that both ends of the strip 5 are wound so as to wrap the laminated body 6 of the electrode sheet 1 and overlapped.

The heat seal 61 moves up and down via the actuator 62. When the heat seal 61 descends and is pressed against both ends of the strip 5 to heat it, both ends of the strip 5 made of resin are joined by welding.

The main body 21 is provided with a slide table 66 which moves along the rails 65 via air cylinders 67. The air cylinder 48 of the clamper 47 is fixed to the slide table 66, and the heat seal 6
The one actuator 62 is fixed. As a result, the slide table 66 is provided with the folded-back portion 4c so that the clamper 47 and the heat seal 61 can be moved between the bundling work position shown by the two-dot chain line and the retracted position shown by the solid line in FIG.

The manufacturing apparatus is constructed as described above, and its operation will be described below.

With the cradle 28 and the base 21 in a continuous stacking working position, the flat strip 5 is placed at a predetermined position across the cradle 28 and the base 21, and the central portion thereof is suction-supported by the suction plate 27. It

Each elevating set pin 32 is projected onto the base 21 and the band 5 is bent into a U-shape.

The electrode sheet 1 is laminated on the strip 5. At this time, the electrode sheets 1 are positioned by being fitted between the elevating set pins 32 protruding on the base 21, the fixed set pins 33, and the movable set pins 34, and are aligned and stacked between the strips 5.

The moving table 22 is moved up from the stacking work position, then rotated 180 °, then lowered and moved to the bundling work position. Then, the slide table 66 is moved from the retracted position to the binding work position. Then, the stacker 6 of the electrode sheets 1 is pressed by the clamper 47 by contracting the air cylinder 48.

Each air cylinder 46 is expanded in order, and each winding roller 45 is moved so that both ends of the strip 5 are wound and wrapped so as to wrap the laminated body 6 of the electrode sheet 1 and overlap each other.
At this time, the laminated body 6 of the electrode sheet 1 is rolled up by the winding roller 4
5 is also pressed down via the clamper 47.

When the heat seal 61 descends and is pressed against both ends of the strip 5 to heat it, the strip 5 made of resin is heated.
Both ends of the are joined by welding. At this time, since the clamper 47 is interposed between the welded portion of the strip 5 and the electrode sheet 1, the electrode sheet 1 is protected, and the pressing force of the heat seal 61 is made uniform so that the welding is performed reliably. .

The heat seal 61 is raised, and then the winding roller 45 is moved from above the laminated body 6 of the electrode sheets 1 and then the slide table 66 is moved to the retracted position to move the clamper 47 to the belt 5 and the electrode sheet 1. Pull out from between. At this time, the air pressure introduced to the air cylinder 48 that moves the clamper 47 up and down is released.

After the electrode sheets 1 are stacked in this manner, both ends of the strip 5 are joined to automatically bind the laminated body 6 of the electrode sheets 1, and then the negative pressure introduced to the suction plate 27 is applied. And the electrode sheet 1 placed on the base 21 is conveyed through the robot hand.

With the above structure, the accuracy of stacking and binding the electrode sheets 1 can be sufficiently ensured and the productivity can be improved.

Further, by putting the manufacturing line including this manufacturing apparatus in the glove box, it becomes possible to manufacture the electric double layer capacitor cell without exposing it to the outside air, and the quality can be stabilized.

It is obvious that the present invention is not limited to the above-mentioned embodiments and various modifications can be made within the scope of the technical idea thereof.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electric double layer capacitor cell showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of an electric double layer capacitor cell showing another embodiment.

FIG. 3 is an explanatory view showing a manufacturing process of an electric double layer capacitor cell.

FIG. 4 is an explanatory view showing a manufacturing process of stacking and binding electrode sheets.

FIG. 5 is a plan view showing a manufacturing apparatus.

FIG. 6 is a side view of the same manufacturing apparatus.

FIG. 7 is a front view of the same manufacturing apparatus.

FIG. 8 is a rear view of the manufacturing apparatus.

[Explanation of symbols]

1 electrode sheet 1a Positive electrode body 1b Negative electrode body 2 collector electrodes 2a Lead part 4 separator 6 laminate 20 Positioning mechanism 21 base 22 Moving table 27 Adsorption plate 28 cradle 30 stacking mechanism 41 Binding mechanism 45 winding roller 47 Clamper 61 heat seal

Claims (6)

[Claims] 1. A method of manufacturing an electric double-layer capacitor cell comprising a laminated body in which a positive electrode body, a negative electrode body, and a separator are laminated, and a laminating step of laminating the laminated body on a strip and binding both ends of the strip together. A method of manufacturing an electric double layer capacitor cell, which comprises sequentially performing the binding step. 2. An electric double layer capacitor cell manufacturing apparatus comprising a laminate of a positive electrode body, a negative electrode body, and a separator, and a stacking mechanism for stacking the stack body on a strip and a binding unit for binding both ends of the strip together. And a mechanism for manufacturing an electric double layer capacitor cell. 3. The stacking mechanism includes a base on which the strip and the stacked body are placed, a suction plate that suction-supports the strip on the base, and a positioning mechanism that surrounds the stacked body. An electric double layer capacitor cell manufacturing apparatus according to claim 2. 4. The positioning mechanism includes an up-and-down set pin protruding from the base so as to be retractable and retractable. The up-and-down set pin is drawn in when the band is placed on the base, and the band is suction-supported by the suction plate. 4. The apparatus for manufacturing an electric double layer capacitor cell according to claim 3, wherein the device is configured to project on the base and then bend the strip. 5. The electric double layer capacitor cell manufacturing apparatus according to claim 3, further comprising a moving table that moves the plurality of bases to a stacking work position or a bundling work position. 6. The binding mechanism includes a clamper for pressing the laminated body, a pair of winding rollers for winding and joining both ends of the band, and a heat seal for welding both ends of the combined band. 5. The electric double layer capacitor cell manufacturing apparatus according to claim 2.