JP2009130275A - Electrical double-layer capacitor, manufacturing method therefor and manufacturing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent deviation between layers of a laminate for improving the capacitor performance, in an electrical double layer capacitor which includes the laminate constituted of a positive electrode body, a negative electrode body and a separator interposed in between them and a vessel sealing the laminate, together with an electrolytic solution. <P>SOLUTION: The capacitor includes an insulating interior component 30, which is configured by a substrate 32 and a side board 33 for regulating the circumference of the laminate 35 set up on the substrate, into a box shape, wherein a surface facing the substrate 32 opens; and a band 31 for winding the interior component 30 and the laminate 35, engaged with the inner side thereof and banding them together. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electric double layer capacitor, a manufacturing method thereof, and a manufacturing apparatus.

  2. Description of the Related Art In recent years, in various power storage devices, attention has been focused on an application technique of an electric double layer capacitor that can be rapidly charged and has a long charge / discharge cycle life.

  An electric double layer capacitor is composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween to form a laminated body (capacitor body), and a pair of terminals are connected as leads of the positive electrode body and the negative electrode body. The laminate is housed in a container and sealed together with the electrolyte.

In such an electric double layer capacitor, when a gap occurs between the layers of the multilayer body, there is a case where a band for winding the multilayer body into a bundled state is provided (Patent Document 1). . The band is made from a thin resin film, wound around a laminate, and joined at both ends.
JP2004-186298

  In spite of the banding (clamping) of the band, a deviation may occur between the layers of the laminate, and the yield of the product is not so good. There are various causes for the occurrence of misalignment between the layers of the multilayer body even in the manufacturing process of the electric double layer capacitor.

  In the case of Patent Document 1, when the same polarity is bundled as the lead of the positive electrode body and the negative electrode body of the laminated body and welded (connected) to the corresponding terminals of the respective polarities, the position at the time of setting to the spot welder is If spot welding is performed even if they do not match, some layers of the laminate may be subjected to excessive tensile force via the leads due to the pressurization of the welding electrodes sandwiching the bundling portion of the leads. If the lid side part is forcibly overlapped with the bottom side part and heat welding is performed even though it does not match the position at the time of carrying into the bottom side part, For example, the laminate may be deformed by pressurization, and a load of the laminate may be applied to the band (lifted by handling adsorption) when the laminate is transported.

  An object of the present invention is to provide an electric double layer capacitor, a method of manufacturing the same, and a manufacturing apparatus that can surely prevent misalignment between layers of the multilayer body in consideration of such a conventional technique.

  According to a first aspect of the present invention, there is provided an electric double layer capacitor comprising: a laminated body composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween; and a container that seals the laminated body together with an electrolyte solution. An insulating interior component configured in a box shape in which a surface facing the substrate is opened from a side plate that regulates the periphery of the laminate formed thereon, and the interior component and the laminate that fits inside the interior component And a band for winding and binding.

  According to a second aspect of the present invention, there is provided a method for manufacturing an electric double layer capacitor comprising: a laminate composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween; and a container that seals the laminate together with an electrolyte. A step of creating an insulating interior component configured in a box shape in which a surface facing the substrate is opened from a substrate and a side plate that regulates the periphery of the laminate formed thereon, and the interior on a belt Stacking components from the substrate side and composing a laminate by alternately stacking positive and negative electrode bodies on the substrate inside the side plate with respect to the interior member while interposing a separator between them; A step of winding and bundling both ends of the band from an interior part onto a laminated body fitted inside thereof.

  According to a third aspect of the present invention, in the method for manufacturing an electric double layer capacitor according to the second aspect of the present invention, the step of composing the multilayer body includes placing the band on the reference planes on both sides across the recesses on the base. The interior parts are stacked on the board side from above and fitted into the recesses on the base together with the belt, and both ends of the belt protrude above the reference plane, and the positive electrode on the board inside the side plate with respect to the interior parts. And a step of composing a laminate by alternately stacking a body and a negative electrode body with a separator interposed therebetween.

  According to a fourth aspect of the present invention, there is provided an electric double layer capacitor manufacturing apparatus comprising: a laminate composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween; and a container that seals the laminate together with an electrolytic solution. , Put the band across the concave part on the base and put it on the reference surface on both sides, overlay the interior parts from the board side on the band and fit it with the band into the concave part on the base, both ends of the band above the reference surface Means for projecting to the interior parts, means for composing a laminate by alternately stacking positive and negative electrode bodies on a substrate inside a side plate with a separator interposed between them, and the belt And a means for winding and binding the both ends of the metal sheet from an interior part onto a laminated body fitted inside thereof.

  According to a fifth aspect of the present invention, in the electric double layer capacitor manufacturing apparatus according to the fourth aspect of the invention, the means for winding and binding the both ends of the band includes a clamper for holding the laminated body fitted inside the interior part, It is characterized by comprising a pair of entraining rollers that are wound together on the laminate and a heat sealer that joins the both ends of the band together.

  In the first aspect of the invention, the laminate is wound together with the interior part and wound together, and is enclosed in a fitting state surrounded by the box-shaped interior part. For this reason, the outer shape of the multilayer body is regulated in a fixed state, and the occurrence of misalignment between layers can be reliably prevented even in the manufacturing process of the electric double layer capacitor. As a result, the product yield is improved. In addition, with respect to the product (electric double layer capacitor), the occurrence of misalignment between the layers of the multilayer body is restricted, and stable good capacitor performance with small variation in capacitance can be obtained.

  In the second to fifth aspects of the invention, by incorporating the interior parts, an electric double layer capacitor having stable and good capacitor performance with no gap between the layers of the multilayer body can be efficiently produced.

  An example of an electric double layer capacitor will be described with reference to FIG. Reference numeral 10 denotes a container for accommodating the capacitor body (laminated body) together with the electrolytic solution, and 11 (11a, 11b) is a pair of terminal plates (capacitor electrodes) drawn to the outside of the container. Each terminal plate 11a, 11b is lightweight and It is formed in a short shape from aluminum having low resistance.

  The capacitor body is configured by alternately laminating positive electrode bodies and negative electrode bodies with separators interposed therebetween. The positive electrode body and the negative electrode body are composed of a collector electrode and polarizable electrodes (activated carbon electrodes) on both sides thereof. These collector electrodes are made of a rectangular metal foil (for example, an aluminum foil), and a strip-shaped lead portion is integrally formed on one side of the rectangular plane. The same polarity of each lead part is bundled, and the terminal board corresponding to polarity is joined (spot welding) to this binding part.

  The container 10 is composed of two component parts (a bottom side part and a lid side part) that are molded in the same shape from a flexible resin film (for example, an aluminum laminate film) having a laminated structure including a metal layer. When combined, the accommodating portion of the laminated body is formed by the planar rectangular concave portions facing each other.

  The multilayer body (capacitor main body) is housed inside the bottom side portion, and the lid side portion is covered from above. At the peripheral edge of the container, three sides excluding one side from which the pair of terminal plates 11a and 11b (tip side) are drawn are heat-sealed (heat sealed). The container 10 can be opened at one side from which the pair of terminal plates 11a and 11b protrudes. After the electrolytic solution is injected into the inside through the opening and the impregnation and electrolytic purification of the electrolytic solution are finished, the excess electrolytic solution is extracted. Then, it is sealed in a vacuum state (the remaining openable side is thermally welded). In FIG. 1, 13a-13d displays a heat welding part (heat seal part).

  FIG. 2 shows a unit body constituting the laminate. In FIG. 2, reference numeral 20 denotes an electrode sheet constituting a positive electrode body or a negative electrode body, which is made from a raw material (made by applying or bonding activated carbon containing a binder to both surfaces of a metal foil) and die-cutting a press. Then, it is molded into a predetermined shape (with a lead part 21 of the collector electrode on one side of a rectangular plane). An exposed region of metal foil (portion where activated carbon does not adhere) is set on one side of the material, and an integrated lead portion 21 is formed on the collector electrode from this exposed region.

  Reference numeral 23 denotes a two-fold separator, which is formed (folded) from a rectangular fabric having a predetermined area. A rectangular fabric is made by cutting a porous film (material) such as paper. The electrode sheets 20 are inserted one by one into the two-fold separator 23, and one unit body 25 is created. The electrode sheet 20 is sandwiched between the front and back of the separator 23 which is folded in two due to the relationship with the lead portion 21 which approaches one side of the collector electrode. Reference numeral 23 a denotes a folded line, and reference numeral 23 a denotes a folded line that forms the folded portions 24 on both sides of the folded separator 23.

  The predetermined number of unit bodies 25 are composed of a predetermined laminate so that the lead portion 21 of the positive electrode body is arranged in one row on each side of the collector electrode and the lead portion 21 of the negative electrode body is on the opposite side. is there. FIG. 3 shows the composition state of the laminate, and insulative interior parts 30 and strips 31 are used to regulate the displacement between the layers of the laminate 35.

  The interior component 30 is formed in a box shape in which a surface facing the substrate 32 is opened from the substrate 32 and the side plate 33 (see FIG. 4). A cutout portion 34 is set in a part of the side plate 33 so as not to interfere with the positive electrode body of the laminated body and the lead portion 21 of the negative electrode body (including a part of the separator 24 in the case of FIG. 3). The predetermined number of unit bodies 25 are alternately reversed, are carried into the interior component 30 from the opening facing the substrate 32, and are sequentially stacked on the substrate 32 while receiving guidance from the side plate.

  When the laminated body 35 is composed inside the interior part 30 that is overlaid on the belt 31, the both ends are hung on the laminated body 35 and joined together to form the laminated body 35 in a box-shaped interior. It is contained in a fitting state surrounded by the component 30. The band 31 is made from a thin resin sheet, and both ends thereof are joined by heat welding.

  After the band is tightened (bundled), the laminated body 35 (contained in a fitted state surrounded by the box-shaped interior part 30) is transported to the next process by a robot hand having a pad for adsorbing the band, and laminated. The step of welding a terminal plate corresponding to the polarity to the lead portion 21 of the body 35, the step of assembling the container 10 into the accommodation state of the laminate 35, and injecting the electrolyte from one openable side of the container 10 accommodating the laminate 35 The process, the process of sealing one openable side of the container 10, and the like are sequentially processed.

  FIG. 4 illustrates processing means for the process of composing the laminated body 35, and constitutes a handling device (not shown) having a pad for adsorbing the unit body 25, and a base for the band 31 and the interior part 30. And a base 40. A recess 41 is formed in the central portion on the base 40, and reference surfaces 42 are set on both sides thereof. In addition, a handling device (not shown) having a pad for adsorbing the band 31 as a loading means for placing the band 31 on the reference surfaces 42 on both sides across the recess 41 on the base 40, and the band 31 on the base 40 A carry-in setting device (not shown) for projecting both end portions of the band 31 above the reference surface 42 as shown in the figure by overlapping the interior part 30 from the side of the substrate 32 and fitting into the recess 41 on the base 40 together with the band 31. ) And are provided.

  Regarding the processing means of the process of winding the band 31, the clamper 50 (see FIGS. 5 and 6) for holding the laminated body stacked inside the interior part 30 and the both ends of the band 31 are wound around the laminated body 1 A pair of winding rollers 55 (see FIGS. 7 to 10) and a heat sealer 60 (see FIGS. 11 and 12) that joins both ends of the band 31 together are provided.

  The clamper 50 includes a presser plate 51 (stainless steel plate) and a support 51, and lowers the presser plate 51 from the retracted position to the operating position or the opposite direction (not shown), and also lowers at the operating position. And a means (not shown) for raising at the retracted position. The holding plate 51 is formed in a rectangular plane having substantially the same width as the electrode surface of the laminated body (end surface in the lamination direction of the laminated body), while the support portion 52 is connected to two places on one side of the holding plate 51. Is done.

  The entraining roller 55 is disposed to face both sides of the base 40 and moves between the operating position and the retracted position. The pair of entraining rollers 55 are controlled so as to move both ends of the belt 31 back and forth rather than moving them synchronously to the operating position so that both ends of the belt 31 sequentially overlap the laminate. Is provided.

  The heat sealer 60 uses a ribbon-shaped heater arranged along a downward projecting surface 61 (pressing surface), and means (not shown) for moving the heater from the retracted position to the operating position or the opposite direction. And means (not shown) for raising and lowering at the operating position.

  5 to 12 illustrate a process of winding the band 31 and a processing means thereof. When a laminate is formed inside the interior member 30, the clamper 50, a pair of winding rollers 55, and a heat sealer 60 are illustrated. , Operate sequentially.

  The clamper 50 moves from the retracted position to the operating position. Accordingly, the heat sealer 60 is also moved from the retracted position to the operating position. At the operating position of the clamper 50, the presser plate 51 descends to pressurize the laminated body. Thereby, a laminated body is compressed to the lamination direction, and an interlayer adheres (refer FIG. 5, FIG. 6). That is, the interior component 30 (see FIGS. 3 and 4) is set to have a depth shallower than the thickness of the laminated body (a predetermined number of unit bodies) formed on the substrate 32. Become.

  In this state, one of the pair of winding rollers 55 moves from the retracted position to the operating position. As a result, one end of the belt 31 is bent while receiving the running of the entraining roller 55 and is superimposed on the laminate (see FIGS. 7 and 8). Subsequently, the other roller 55 moves from the retracted position to the operating position. As a result, the other end of the band 31 is bent while receiving the running of the entraining roller, and is overlapped on the laminate, and both ends of the band 31 are overlapped at the center on the laminate (FIG. 9). , FIG. 10). Since each roller 55 travels across the thin plate 51 (presser plate) of the clamper 50, both ends of the belt 31 can be accurately folded onto the laminate.

  In this state, the heat sealer 60 descends and the projecting surface 61 presses the overlapping end portions of the band 31 against the presser plate 51 on the laminate. Thereby, both ends of the belt 31 receive heat from the heater and are welded (joined) (see FIGS. 11 and 12). Both end portions of the band 31 are heat-welded on the presser plate 51 (stainless steel plate), and a good bonded state is obtained. Further, the presser plate 51 can prevent the influence of heat on the laminated body.

  When the joining (thermal welding) of the band 31 is completed, the heat seal 60, the pair of entraining rollers 55, and the clamper 50 are returned to the order. When the heat seal 60 is raised, the pair of winding rollers 55 moves to the retracted position. Subsequently, the presser plate 51 of the clamper 50 is retracted to the retracted position while being pulled out from between the band 31 and the laminated body, and the heat seal 60 is also moved to the retracted position along with this. The clamper 50 returns by raising at the retracted position.

  Thereafter, the laminated body (contained in a fitted state surrounded by the box-shaped interior part 30) is subjected to a next step (a terminal corresponding to the polarity in the lead portion of the laminated body) by a robot hand having a pad that adsorbs the band 31. To the process of welding the plates.

  By such a manufacturing method, it is possible to obtain an electric double layer capacitor having a stable and good capacitor performance without any deviation between the layers of the multilayer body. The laminated body 35 is enclosed in a fitting state surrounded by the box-shaped interior component 30 by binding the band 31 (see FIG. 3). In other words, since the outer shape of the laminated body 35 is restricted to a fixed state, occurrence of misalignment between layers is prevented. As a result, the capacitance is ensured without variation, and the reliability and durability of the product (electric double layer capacitor) are greatly enhanced.

  Manufacturing process of electric double layer capacitor (step of welding terminal plates 11a and 11b corresponding to polarity to lead portion 21 of laminated body, step of assembling container 10 into accommodation state of laminated body, opening of container 10 for accommodating laminated body In the step of injecting the electrolyte from one possible side, the step of sealing the openable side of the container 10, and the like during transportation between these steps, the outer shape of the laminate is fixed by the interior component 30 and the band 31. Since it is protected by the state, the occurrence of misalignment between layers due to processing and processing is surely prevented.

  In this embodiment, the unit body 25 is laminated on the substrate 32 of the interior component 30. From the electrode sheet 20 (positive electrode body), the electrode sheet 20 (negative electrode body), and the separator, these are sequentially supplied to the interior component 30. It is also conceivable to form a laminate by carrying it in and stacking. In that case, you may laminate | stack a separator so that a thing without a broken line (one thing of predetermined size) may be interposed between a positive electrode body and a negative electrode body.

  About the belt | band | zone 31 and the interior component 30, in order to ensure favorable permeability of the electrolyte solution to a laminated body, it is desirable to provide the hole (many small holes) which can distribute | circulate electrolyte solution. The band 31 is preferably made from a heat-shrinkable resin sheet (PP material) in order to tightly wind the laminate around the interior component 30.

It is a perspective view of an electric double layer capacitor. It is explanatory drawing of a unit body. It is a top view which shows the composition state of a laminated body. It is explanatory drawing which concerns on the process means of the process of composing a laminated body. It is explanatory drawing which concerns on the process of winding a belt | band | zone, and its processing means. It is an AA arrow line view of FIG. It is explanatory drawing which concerns on the process of winding a belt | band | zone, and its processing means. It is a B arrow line view of FIG. It is explanatory drawing which concerns on the process of winding a belt | band | zone, and its processing means. It is C arrow line view of FIG. It is explanatory drawing which concerns on the process of winding a belt | band | zone, and its processing means. It is a DD arrow line view of FIG.

Explanation of symbols

10 container 11, 11a, 11b terminal plate 20 electrode sheet (positive electrode body, negative electrode body)
21 Lead part 24 Separator 25 Unit body 30 Interior member 31 Band 32 Substrate 33 Side plate 34 Notch part 35 Laminate body 40 Base 41 Recess 42 Reference surface 50 Clamper 51 Holding plate 55 Rolling roller 60 Heat seal

Claims (5)

  In an electric double layer capacitor comprising a laminate composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween, and a container for sealing the laminate together with an electrolytic solution, the substrate is composed on the substrate. An insulating interior component configured in a box shape in which a surface facing the substrate opens from a side plate that regulates the periphery of the laminate, and a band that winds and binds the interior component and the laminate that fits inside the interior component An electric double layer capacitor comprising:   In a method for manufacturing an electric double layer capacitor, comprising: a laminate composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween; and a container for sealing the laminate together with an electrolyte solution. A step of creating an insulating interior component configured in a box shape in which a surface facing the substrate is opened from a side plate that regulates the periphery of the laminate to be composed; and the interior component is stacked on the belt from the substrate side A step of composing a laminate by alternately stacking a positive electrode body and a negative electrode body on the substrate inside the side plate with respect to this interior member while interposing a separator between them, and both ends of the band A method of manufacturing an electric double layer capacitor, comprising: a step of winding and bundling on a laminated body fitted inside from an interior part.   The step of composing the laminate includes placing the band on the reference surfaces on both sides across the recess on the base, stacking the interior parts on the band from the substrate side, and fitting the band together with the band into the recess on the base. A step of causing both end portions of the substrate to protrude above the reference surface, and a positive electrode body and a negative electrode body alternately stacked on the substrate inside the side plate with respect to this interior part with a separator interposed therebetween. And a method of manufacturing the electric double layer capacitor according to claim 2.   In an electric double layer capacitor manufacturing apparatus, comprising: a laminated body composed of a positive electrode body, a negative electrode body, and a separator interposed therebetween; and a container for sealing the laminated body together with an electrolyte solution. A means for straddling the recess and placing it on the reference surfaces on both sides, stacking the interior parts on the band from the substrate side and fitting them into the recess on the base together with the band, and projecting both ends of the band above the reference surface, A means for composing a laminate by alternately stacking a positive electrode body and a negative electrode body on a substrate inside a side plate with respect to this interior part while interposing a separator between them, and both ends of the belt are connected to the interior part. And a means for winding and bundling on the laminated body fitted inside thereof, and an electric double layer capacitor manufacturing apparatus.   The means for winding and binding the both ends of the belt includes a clamper for pressing the laminated body fitted inside the interior part, a pair of winding rollers for winding both ends of the belt around the laminated body, and both ends of the belt The apparatus for manufacturing an electric double layer capacitor according to claim 4, further comprising: a heat sealer that joins the two in a combined state.

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