JP2010114364A - Electrochemical device, and electrochemical device module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superior electrochemical device which has improved work efficiency and superior electric connectivity, and eliminates periodical clamping of a screw, and to provide an electrochemical device module. <P>SOLUTION: The electrochemical device includes an electrochemical element having a positive electrode and a negative electrode opposed to each other with a separator interposed between them, a plurality of external terminal plates 12 electrically connected to the positive electrode and negative electrode respectively, an enveloping sheet 4 incorporating the electrochemical element to seal it at a joint portion, at least some of the external terminal plates 12 being led out of the enveloping sheet 4. Each of the external terminal plates 12 has a plurality of conductor connection contact branches 5 for electric connections with external equipment through conductive members, the conductor connection contact branches 5 are formed in areas sandwiched between a plurality of through holes formed in at least a part of the external terminal plate 12, and protrude along the thickness of the external terminal plate 12, the protruding connection contact branches 5 coming in contact with the conductive members to be electrically connected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention incorporates an electrochemical device such as an electric double layer capacitor, a lithium ion capacitor, and a lithium ion secondary battery, particularly an external terminal plate and an electrochemical element that are led out of the electrochemical device. The present invention relates to an electrochemical device having a laminated structure and an electrochemical device module having an exterior film to be sealed.

  Electrochemical devices with a chargeable / dischargeable power supply function having an exterior structure made of a laminate film include electric double layer capacitors and lithium ion secondary batteries. Recently, positive electrodes and lithium ion secondary batteries of electric double layer capacitors are also included. A hybrid type capacitor (hereinafter referred to as a hybrid capacitor) in combination with a negative electrode of a battery is also known.

Electric double layer capacitors are generally based on the type of electrolyte used, aqueous electrolyte type using inorganic aqueous electrolyte such as sulfuric acid and potassium hydroxide, and organic electrolyte not containing water such as propylene carbonate and acetonitrile. The solvent is classified into a non-aqueous electrolyte type using tetraethylammonium tetrafluoroborate (Et ₄ NBF ₄ ) or the like as an electrolyte. The withstand voltage of a single electric double layer capacitor is about 1.2 V in the case of an aqueous electrolyte type, and about 2.7 V in the case of a non-aqueous electrolyte type. In order to increase the energy capacity that can be stored in the electric double layer capacitor, it is important to further increase the withstand voltage.

  Further, the lithium ion secondary battery includes a positive electrode mainly composed of a lithium-containing transition metal oxide, a negative electrode mainly composed of a carbon material that can occlude and desorb lithium ions, and an organic electrolyte solution including a lithium salt. It is composed of When the lithium ion secondary battery is charged, lithium ions are desorbed from the positive electrode and occluded in the carbon material of the negative electrode. Conversely, when discharged, lithium ions are desorbed from the negative electrode and occluded in the metal oxide of the positive electrode. Lithium ion secondary batteries have the properties of higher voltage and higher capacity than electric double layer capacitors, but have the disadvantages of high internal resistance and a constant life in charge / discharge cycles.

  The hybrid type capacitor uses activated carbon for the positive electrode and a carbon material capable of inserting and extracting lithium ions for the negative electrode. The potential difference between the two electrodes that actually occurs inside the capacitor shifts to a more basic value that is closer to the case where lithium metal is used for the negative electrode because lithium ions are absorbed and desorbed in the negative electrode during charging and discharging. . Therefore, the withstand voltage can be further increased as compared with the conventional electric double layer capacitor using activated carbon for the positive electrode and the negative electrode, and the amount of energy that can be stored is greatly increased compared to the electric double layer capacitor (high Energy).

  A conventional general electrochemical device uses a metal container. The electrochemical device housed in this metal container is produced, for example, by the following steps. First, a separator is sandwiched between a positive electrode plate and a negative electrode plate that are shaped into a foil shape, and wound to form an element having a circular or non-circular cross-sectional shape. Form the body. This electrode body is housed in a stainless steel, nickel-plated iron or aluminum metal container, external terminals are connected to the positive electrode plate and the negative electrode plate of the internal electrode body, respectively, and the electrolytic solution is applied to the metal container. After pouring, the lid plate is sealed and completed. In this way, products using metal containers have high airtightness and excellent mechanical strength, but they are used in applications where weight reduction is required and products with various shapes are required in response to market needs. When using it, there was a big restriction. As means for solving this problem, an exterior film structure has been proposed in which an electrode body is sheathed with a laminate film or the like instead of a metal container.

  Electrochemical devices such as those mentioned above are used as an energy source for driving motors such as electric vehicles, or as a key device for energy regeneration systems, and also as an uninterruptible power supply due to environmental concerns such as oil reserves and global warming. Application to various new uses such as application to wind power generation and solar power generation is being studied, and it is a highly promising device as a next-generation device.

  In order to apply these electrochemical devices to the apparatus, it is necessary to connect the electrochemical devices in series and parallel. In order to electrically connect the electrochemical device, a conductive portion such as a bus bar is required, which increases the number of parts and the number of work steps. In particular, when connecting in series, it is necessary to superimpose electrochemical devices while alternately inverting them so that different polarities are opposed to each other. The accompanying increase in the number of work steps and the breakage of electrochemical devices during the work are problems. In addition, since it is screwed with a bus bar or the like in the long term, maintenance such as periodic screw tightening is required.

  As a solution to the conventional problem relating to series-parallel connection of electrochemical devices having this exterior film structure, a method described in Patent Document 1 has been proposed.

  Patent Document 1 proposes the following structure. In an assembled battery obtained by combining cells in which a flat plate group is enclosed in a laminate film, two types of cells, cell A1 and cell B2, are used as the assembled battery. One surface has a substantially flat plane portion and a protruding surface portion from which the other surface protrudes, and positive and negative electrode terminals are led out from one side of the laminate film along the plane portion. The tip of each terminal of the cell A1 is bent to the flat part side and the protruding surface part side, and the tip part of both terminals of the cell B2 is bent to the protruding surface part side. The cell A1 and the cell B2 are arranged so that the protruding surface portions face each other, and are fixed to the intermediate frame with screws. A terminal bent to the protruding surface portion side of the cell A1 and a terminal bent to the protruding surface portion side of the cell B2 are overlapped and connected.

  With such a structure, busbarless, module miniaturization, and assembly are improved. However, since the terminals are fixed to the intermediate frame, which is a common electrically insulating material, the contact surfaces between the terminals are only one surface, and depending on the surface state of the contact surfaces of the terminals, the contact area becomes small and the contact resistance Is likely to increase. Since an electrochemical device is required to supply a large current, an increase in contact resistance cannot be denied.

JP 2006-66322 A

  The method of bending the terminals derived from the exterior film described in Patent Document 1 in opposite directions and overlaying and fixing the terminals from a common electrical insulating material on the frame has a certain effect in reducing the number of parts and improving the assemblability. However, there are problems that the contact resistance increases because the contact area of the terminal is reduced, and that periodic screw tightening is necessary.

  As a method for solving regular screw tightening, a method such as using a resin adhesive for preventing screw loosening can be considered. In this case, since the resin adhesive is applied directly to the terminals of the electrochemical device, the resin adhesive is transferred to the thermoplastic resin portion of the exterior film sheet and the external terminal plate, etc. When the part is eroded, the adhesion between the external terminal board and the exterior film sheet is impaired, which causes a deterioration in the reliability of the product.

  As an energy source for driving motors such as electric vehicles, or as a key device for energy regeneration systems, various new applications such as uninterruptible power supply, wind power generation, and solar power generation are being studied. When applied to the apparatus, the electrochemical device preferably has excellent electrical connectivity, a small number of parts, and excellent workability such as installation and subsequent maintainability. Therefore, it is useful to propose a method that is superior in workability, device electrical connectivity, and maintainability as compared with the method described in Patent Document 1 for application to these new fields.

  Accordingly, an object of the present invention is to propose an electrochemical device and an electrochemical device module that are excellent in workability and electrical connectivity and do not require periodic screw tightening.

  The present invention relates to an electrochemical element including a positive electrode and a negative electrode facing each other via a separator, and the electrochemical element is laminated, and each laminated electrochemical element is filled with an electrolyte solution. The present invention relates to an external terminal structure derived from an exterior film sheet of an electrochemical device sealed with a sheet. According to the present invention, a positive electrode and a negative electrode extending from each electrochemical element are bundled and bonded to each other, and a through hole is formed in a region led out from the exterior film of the external terminal plate. It is set as the structure which provided the some conductor connection contact branch protruded in the thickness direction of the board.

  That is, the present invention provides an electrochemical element including a positive electrode and a negative electrode facing each other with a separator interposed therebetween, a plurality of external terminal plates electrically connected to the positive electrode and the negative electrode, and the electrochemical An exterior film containing an element and hermetically sealed at a joint, wherein at least a part of each of the external terminal plates is led out of the exterior film, and the external terminal plate is A plurality of conductor connection contact branches for electrically connecting to an external device through a conductive member, and the conductor connection contact branches are formed in a plurality of through holes formed in at least a part of the external terminal plate. The electrochemical device is characterized in that it is formed in a sandwiched region, protrudes in the thickness direction of the external terminal plate, and the protruding conductor connection contact branch contacts and is electrically connected to the conductive member.

  Further, according to the present invention, the conductor connection contact branch has a shape in which both end portions have a narrow width, are inclined toward the center portion, and the center portion has a wide width. The electrochemical device is characterized in that it protrudes in the thickness direction of the terminal board, and the central portion of the protruding conductor connection contact branch contacts the conductive member.

  Further, according to the present invention, the conductor connection contact branch has a triangular shape or a semicircular shape, protrudes in the thickness direction of the external terminal plate, and a center portion of the protruded conductor connection contact branch contacts the conductive member. It is the electrochemical device characterized.

  Further, according to the present invention, the conductor connection contact branch protrudes 20 to 1000% with respect to the thickness of the external terminal plate, protrudes from a contact position with the conductive member, and has a contact pressure with the conductive member. It is an electrochemical device characterized in that it is electrically connected by the above.

  Furthermore, the present invention is the electrochemical device, wherein the conductor connection contact branch is provided with a taper at least in part.

  Furthermore, the present invention provides at least a part of the surface of the external terminal plate that is led out to the outside of the exterior film, at least part of any of nickel, chromium, tin, silver, platinum, gold, copper, rhodium, and palladium. An electrochemical device characterized in that at least one or more plating treatments using one or more of them are applied.

  Furthermore, the present invention is an electrochemical device characterized in that the electrochemical device is any one of an electric double layer capacitor, a lithium ion secondary battery, and a hybrid capacitor.

  Furthermore, the present invention is an electrochemical device module in which a plurality of the electrochemical devices are connected in series or in parallel via a conductive member, and a plurality of conductor connection contact branches projecting in the thickness direction of the external terminal plate. Is an electrochemical device module that is in contact with and electrically connected to the conductive member.

  In the electrochemical device according to the present invention, a plurality of conductor connection contact branches are provided on the external terminal plate, and the plurality of electrochemical devices are connected in series or in parallel by contacting the conductor connection contact branches and the bus bars as the conductive members. . At this time, since the conductor connection contact branch provided on the external terminal plate protrudes from the surface of the external terminal plate in the thickness direction, its spring characteristics stabilize the contact pressure with the bus bar for a long time, and Contact resistance can be minimized. By minimizing the contact resistance, it is possible to further enhance the current carrying performance between the electrochemical devices.

  In addition, the conductor connection contact branch provided on the external terminal plate can be screw-free in connection with the bus bar, the work man-hours can be reduced, the connection space can be reduced, and periodic screw tightening becomes unnecessary. In addition, the surface of the conductor connection contact branch is plated to increase the hardness of the base material of the external terminal board and further improve the spring characteristics of the conductor connection contact branch, so that the contact pressure with the bus bar is stable for a long time. , Can maintain a reliable contact.

  Embodiments of the electrochemical device of the present invention will be described below with reference to the drawings.

  FIGS. 1 to 6 show examples of configuration diagrams of an electrochemical device according to an embodiment of the present invention, and particularly show the case of an electric double layer capacitor. However, even in the case of lithium ion secondary batteries and hybrid capacitors, which are other electrochemical devices, the arrangement of the positive electrode plate and the negative electrode plate used and the configuration of the conductor connection contact branch provided on the external terminal plate There is no particular difference in the configuration of the exterior film sheet incorporating the metal foil.

  FIG. 1 is a diagram showing the shape and internal configuration of an electric double layer capacitor according to the present invention. FIG. 1 (a) is a top view, FIG. 1 (b) is a side view, and FIG. 1 (c) is FIG. It is an AA 'line sectional view of). In FIG. 1, the upper and lower surfaces of the electric double layer capacitor 1 are covered with an exterior film sheet 4, and a positive external terminal plate 2 and a negative external terminal plate 3 extend on the left side of each diagram of FIG. 1. . As shown in FIG. 1B, the positive external terminal plate 2 and the negative external terminal plate 3 are led out from between the upper and lower exterior film sheets 4 respectively. The positive electrode external terminal plate 2 and the negative electrode external terminal plate 3 are provided with conductor connection contact branches 5 for electrical connection with the connection bus bar. The conductor connection contact branch 5 protrudes from the surfaces of the positive external terminal plate 2 and the negative external terminal plate 3. In addition, as shown in FIG. 1C, a plurality of electrode laminates 6 to be described later are laminated inside the electric double layer capacitor 1. Each electrode laminate 6 is provided with a positive electrode plate and a negative electrode plate, and is connected to the positive electrode external terminal plate 2 and the negative electrode external terminal plate 3, respectively. An electrolyte solution is filled between the upper and lower exterior film sheets 4, and the electrode laminate 6 is immersed in the electrolyte solution.

  The exterior film sheet 4 covers the electrode laminate 6 from the upper surface and the lower surface. In addition, in the peripheral region, the exterior film sheet 4 on the upper surface and the lower surface adhere to each other to seal the contents containing the electrolyte. The structure prevents the leakage. In addition, the positive electrode external terminal plate 2 and the negative electrode external terminal plate 3 are configured to cover and seal the periphery of each terminal plate at a position (joining portion) where the positive electrode external terminal plate 2 and the negative electrode external terminal plate 3 lead out. Therefore, the electric double layer capacitor 1 is completely sealed by adhesion between the exterior film sheets 4 and covering around the joint between the positive external terminal plate 2 and the negative external terminal plate 3 by the external film sheet 4.

  FIG. 2 is a diagram showing the configuration of the electrode laminate inside the electric double layer capacitor of the present invention, FIG. 2 (a) is a top view of the positive electrode portion, FIG. 2 (b) is a diagram showing a separator, FIG. (C) is a top view of the negative electrode portion. The positive electrode portion shown in FIG. 2 (a) is composed of a polarizable electrode sheet 9 and a positive electrode plate 7, and the polarizable electrode sheet 9 is generally one or both sides of a current collector made of a metal foil such as aluminum. In addition, a polarizable electrode layer containing a large amount of an active material mainly composed of a carbon material is integrated, and often includes a binder and a conductive agent. The positive electrode plate 7 is generally formed by extending a part of the current collector constituting the polarizable electrode sheet 9, but a thin metal body is fixed to the polarizable electrode sheet 9 by a method such as welding or pressure bonding. You may have done.

  The negative electrode portion shown in FIG. 2 (c) is basically the same material as the positive electrode portion of FIG. 2 (a), and there is no structural difference except for the position where the negative electrode plate 8 is taken out. The polarizable electrode sheet 10 is also made of the same material as that of the polarizable electrode sheet constituting the positive electrode portion, and the shape thereof is almost the same as that of the polarizable electrode sheet 9. In addition, although the case where it is set as the same shape as the polarizable electrode sheet 9 is shown in FIG.2 (c), both area and shape may not be the same.

  The separator 11 shown in FIG. 2 (b) is an insulating thin plate, and generally needs to be a material that is slightly larger than the polarizable electrode sheets 9 and 10 and easily penetrates the electrolyte.

  The electrode laminate 6 for one layer includes a separator 11 shown in FIG. 2B from above, a positive electrode portion shown in FIG. 2A, a separator 11 shown in FIG. 2B, and a negative electrode portion shown in FIG. Are stacked in this order. Between the lower adhesive layer of the upper exterior film sheet 4 and the uppermost polarizable electrode sheet 9, between the two polarizable electrode sheets 9, 10, and the lowermost polarizable electrode sheet 10 and the lower exterior One separator 11 is always inserted between the adhesive layers at the top of the film sheet.

  FIG. 3 is a perspective view of an electrode body constituting the electric double layer capacitor of the present invention, and is composed of an electrode laminate 6 in which polarizable electrode sheets 9 and 10 and separators 11 are alternately laminated. A plurality of positive electrode plates 7 and negative electrode plates 8 extend from the end face of the electrode laminate 6. The number of each of the extended positive electrode plate 7 and negative electrode plate 8 matches the number of electrode laminates 6 constituting the electrode body.

  4A and 4B are diagrams showing the configuration of the external terminal plate constituting the electric double layer capacitor of the present invention. FIG. 4A is a top view, FIG. 4B is a side view, and FIG. 4C is a conductor. It is explanatory drawing of a connection contact branch. The external terminal plate 12 is connected to the positive electrode plate 7 and the negative electrode plate 8 of the electrode body shown in FIG. As shown in FIG. 4A, the external terminal plate 12 is formed with a plurality of through holes and provided with conductor connection contact branches 5. Moreover, the junction part 15 joined to an exterior film sheet is provided. As shown in FIG. 4B, the conductor connection contact branch 5 protrudes from the surface of the external terminal plate 12 in the thickness direction. In the present embodiment, the conductor connection contact branches 5 are evenly arranged in a line, but the arrangement method is not limited to this.

  The conductor connection contact branch 5 will be described in detail with reference to FIG. FIG. 4C is an explanatory diagram of the conductor connection contact branch, and a part of the conductor connection contact branch of FIG. A through hole 13 is formed in the external terminal plate 12, and a portion sandwiched between the through holes 13 becomes the conductor connection contact branch 5. In the present embodiment, the through hole 13 has a shape in which the width of the central portion in the longitudinal direction is narrow and the width of both end portions is widened, and the conductor connection contact branch 5 is bulged at the central portion in the longitudinal direction. The shape was narrowed over the part. The conductor connection contact branch 5 is rotated at a predetermined angle so as to be twisted in the direction of the thick arrow with both ends (B-B ′ line in the figure) as axes. With this structure, the central portion of the conductor connection contact branch 5 can be brought into contact with a connection bus bar (not shown) which is a conductive member by projecting from the upper and lower surfaces of the external terminal plate 12. Furthermore, the amount of protrusion from the external terminal plate 12 can be adjusted by the angle at which the conductor connection contact branch 5 is rotated. The larger the amount of protrusion, the stronger the contact pressure with the connection bus bar due to the spring effect. At this time, as in the present embodiment, at least a part of the corner of the conductor connection contact branch 5 is tapered so that it can be easily inserted into and removed from the connection bus bar. Therefore, the conductor connection contact branch 5 is provided with a taper. It is desirable to have a structure. It is obvious that the shape of the conductor connection contact branch 5 is determined by the shape of the through-hole 13, and these shapes are not limited to the present embodiment. Further, the projecting direction of the conductor connection contact branch 5 is not necessarily limited to the upper and lower surfaces, and may be configured to have only one surface so as to be bent in the same direction.

  Examples of other shapes of the conductor connection contact branch 5 are shown in FIGS. 5A and 5B are diagrams showing another shape of the conductor connection contact branch, in which FIG. 5A is a top view and FIG. 5B is a side view. In FIG. 5, a through hole 13 as shown in FIG. 5A is formed in the external terminal plate 12, and a portion sandwiched between the through holes 13 becomes the conductor connection contact branch 5. With the both ends of the conductor connection contact branch 5 as axes, the conductor connection contact branch 5 is bent at a predetermined angle, protruded in a triangular shape on the upper surface of the external terminal plate 12, and the protruding triangular tip portion is in contact with a bus bar (not shown). 6A and 6B are diagrams showing still another shape of the conductor connection contact branch, in which FIG. 6A is a top view and FIG. 6B is a side view. In FIG. 6, a through hole 13 as shown in FIG. 6A is formed in the external terminal plate 12, and a portion sandwiched between the through holes 13 becomes the conductor connection contact branch 5. The conductor connection contact branch 5 is projected in a semicircular shape on the upper surface of the external terminal plate 12 by press molding or the like, and the protruding semicircular tip is in contact with a connection bus bar (not shown). Moreover, although the conductor connection contact branch 5 is bent so as to protrude only on the upper surface of the external terminal plate 12, for example, it can be processed so as to protrude alternately on both upper and lower surfaces. Furthermore, the shape of the conductor connection contact branch 5 is not limited to these, and the same effect can be obtained even in a trapezoidal shape, a convex shape, or the like.

  It is desirable to provide the conductor connection contact branch 5 in the region derived from the exterior film sheet of the external terminal plate 12, and then to perform plating on the surface of the external terminal plate 12. In the present embodiment, electroless nickel is used. Plating was applied. By providing the conductor connection contact branch 5 on the external terminal plate 12 and further performing plating treatment, the hardness of the conductor connection contact branch 5 is increased, and the spring effect in the direction perpendicular to the surface of the external terminal plate 12 is improved. Reliable contact is possible. Regarding the plating process on the external terminal plate 12, it may be before the conductor connection contact branch 5 is processed.

  FIG. 7 is a perspective view showing an external appearance of the electrode body after the external terminal plate constituting the electric double layer capacitor of the present invention is attached. As described above, the electrode body is composed of a plurality of flat electrode laminates 6, and each of these electrode laminates 6 has one positive electrode plate 7 and one negative electrode plate 8. ing. The positive electrode plates 7 and the negative electrode plates 8 of the electrode body are bundled together and connected to the external terminal plate 12 by methods such as ultrasonic welding, resistance welding, and laser welding. When the positive electrode plate 7 and the negative electrode plate 8 are bundled, each electrode plate may be bent. The external terminal plate 12 is provided with a joining portion 15 in a band shape, and the exterior film sheet is hermetically fixed to the external terminal plate at this position. A conductor connection contact branch 5 is formed on the surface of the external terminal plate 12 derived from the exterior film sheet, and the conductor connection contact branch 5 protrudes from the surface of the external terminal plate 12 by a certain height in the thickness direction. This area is the contact area of the connection bus bar.

  The area where the conductor connection contact branch 5 is formed is 10% to 90% of the area of the external terminal plate 12 derived from the exterior film sheet, so that the connection between the conductor connection contact branch 5 and the connection bus bar is stable. This is a desirable range in consideration of the properties and the strength of the external terminal plate 12.

  FIG. 8 is a perspective view of the appearance of the electric double layer capacitor of the present invention. The electrode body to which the external terminal plate 12 shown in FIG. 7 is attached is covered with an exterior film sheet 4 and sealed by injecting an electrolytic solution. As the exterior film sheet, a laminated film obtained by bonding a metal foil and a polyolefin film can be used. A thermoplastic resin is formed inside the exterior film sheet, and polyethylene, polypropylene, acid-modified propylene, an ethylene-methacrylic acid copolymer, and the like can be used as the thermoplastic resin.

  A plurality of electrochemical devices such as the electric double layer capacitor as described above are stacked and connected in series or in parallel via a connection bus bar which is a conductive member. In the present embodiment, two electrochemical devices are connected in series via a connection bus bar. FIG. 9 is a configuration diagram in which the electrochemical device of the present invention is connected in series via a connection bus bar. FIG. 9 (a) is a top view, FIG. 9 (b) is a side view, and FIG. 9 (c) is FIG. It is an enlarged view of the C section of (b). As shown in FIG. 9, the conductor connection contact branch 5 protruding in the thickness direction from the external terminal plate 12 is in contact with the connection bus bar 17 to obtain an electrical connection. At this time, it is desirable that the conductor connection contact branch 5 protrudes 20% to 1000% with respect to the thickness of the external terminal plate 12 and that the conductor connection contact branch 5 protrude further than the contact position of the connection bus bar 17. With such a configuration, when contacted with the connection bus bar 17, the conductive connection contact branch 5 comes into contact with a contact pressure in a direction in which the connection bus bar 17 is pressed due to its spring characteristics, and is reliable and stable. Connection becomes possible. In addition, the shape of the connection bus bar 17 is not limited to this Embodiment, For example, what is necessary is just a shape which can electrically connect the external terminal board of several electrochemical devices, such as E shape.

Here, an example of a manufacturing method of the multilayer electric double layer capacitor in the embodiment of the present invention will be described below. The polarizable electrode sheets for the positive electrode and the negative electrode are obtained by mixing an active material mainly composed of a carbon material, a binder, and a conductive agent with a current collector of a metal foil made of aluminum foil or nickel foil. What was made into the polar electrode layer is integrated. The carbon raw material used as the active material includes plant materials such as wood, sawdust, coconut husk and pulp waste liquid, coal, heavy petroleum oil, or coal-based and petroleum-based pitch obtained by pyrolyzing them, petroleum coke. Various materials such as fossil fuel materials such as carbon aerogel and tar pitch, and synthetic polymer materials such as phenol resin, polyvinyl chloride resin and polyvinylidene chloride are used. These carbon material after carbonization, and activating the gas activation method or chemical activation method, the specific surface area to obtain a carbon-based active material of 700m ² / g~3000m ² / g. The specific surface area of the active material is particularly preferred if the 1000m ² / g~2000m ² / g.

  In addition, as the binder material, polytetrafluoroethylene, polyvinylidene fluoride, fluoroolefin copolymer cross-linked polymer, polyvinyl alcohol, etc. are used, including a binder of about 3 wt% to 20 wt% of the whole sheet-like material. It is preferable to make it. Among these substances, polytetrafluoroethylene is particularly preferable from the viewpoint of heat resistance, chemical resistance, and strength of the sheet-like polarizable electrode layer to be produced. In addition, as the conductive agent, a substance selected from carbon black such as acetylene black and ketjen black, natural graphite, and thermally expanded graphite carbon fiber is used in an amount of 5 wt% to 30 wt% based on the polarizable electrode layer. It is preferable to add about%.

  Next, an example of a method for producing positive and negative polarizable electrode sheets using the aforementioned polarizable electrode layer will be described. In the following example, a phenol resin is used as a carbon raw material to be an active material, polytetrafluoroethylene is selected as a binder material, and ketjen black is selected as a conductive agent. First, the activated carbon powder produced by carbonizing and activating the phenol resin, the binder composed of the polytetrafluoroethylene, and the ketjen black are kneaded, and then rolled to form a sheet-like polarizable electrode layer. . The polarizable electrode layer thus obtained is bonded to a roughened current collector foil of aluminum or nickel using a conductive carbon paste. Furthermore, it integrates by heating-drying and makes this a polarizable electrode sheet. At this time, if one extension portion is formed in advance on the current collector foil and the polarizable electrode layer is not adhered thereto, positive and negative electrode plates connected to the external terminal plate are formed. be able to. The polarizable electrode sheet may be made of the same material for both the positive electrode and the negative electrode, but the dimensions and shapes may be the same for the positive electrode and the negative electrode, or different.

  The polarizable electrode sheet may be produced not by the above method but by a method in which the polarizable electrode layer and the current collector are overlapped and rolled to bond them together. The polarizable electrode layer may be bonded to one side of the current collector or may be bonded to both sides. Furthermore, in a solution in which a binder such as methylcellulose or polyvinylidene fluoride is dissolved in a solvent, the active material or conductive agent is mixed and dispersed to form a slurry, and this slurry is applied to one or both sides of the current collector, A polarizable electrode sheet may be produced.

  Moreover, the separator installed between the polarizable electrode sheets of the positive electrode and the negative electrode or between the exterior film sheet and the polarizable electrode sheet is preferably a material having a small thickness and high electronic insulation and ion permeability. Although the constituent material of a separator is not specifically limited, For example, the nonwoven fabrics, such as polyethylene and a polypropylene, or the papermaking of a viscose rayon or a natural cellulose is used suitably. The constituent material of the separator is preferably selected according to the type of electrochemical device to be produced.

  Next, an example of a method for manufacturing the external terminal board will be described. A plurality of through holes are formed in a small piece made of an aluminum metal plate by a pressing method using a mold, laser processing, or a chemical etching method using chemicals. Thereafter, the conductor connection contact branch portion is rotated by a predetermined angle about both ends as an axis by pressing, thereby projecting the plurality of conductor connection contact branches. Next, nickel plating is performed on the surface of the external terminal plate region led out from the exterior film sheet by an electroless plating method to produce an external terminal plate used in the electrochemical device of the present invention. In addition, regarding a plating process, it is also possible to process by methods, such as electroplating, hot dipping, and dispersion plating. The base material of the external terminal board is preferably selected according to the type of electrochemical device.

  Hereinafter, examples and comparative examples will be described. Of the following Examples and Comparative Examples, Examples 1-3, 15-26 and Comparative Examples 1-8 are electric double layer capacitors as electrochemical devices, Example 4 is a lithium ion secondary battery, and Example 5 -14 are each what produced the hybrid capacitor and performed various evaluation.

Example 1
A powder of phenol-based activated carbon having a specific surface area of 1500 m ² / g as an active material and ketjen black as a conductive agent were mixed so that the weight ratio was 8: 1. To this mixed powder, polyvinylidene fluoride dissolved in N-methylpyrrolidone as a binder was added so that the weight ratio of the mixed powder to the binder was 9: 1 and kneaded to obtain a slurry. Next, an aluminum foil having a thickness of 30 μm whose both surfaces are roughened by etching treatment is used as a current collector, and the slurry is uniformly applied to both surfaces thereof, and then dried and cut. Each obtained a 70 μm polarizable electrode sheet. The thickness of this polarizable electrode sheet is 170 μm. In addition, a part of the end face of the polarizable electrode sheet has a current collector extending in a tab shape to form an electrode plate, and a polarizable electrode layer is not formed on both sides of the current collector of that part, The aluminum foil is exposed. In addition, the dimension shape of each polarizable electrode sheet of a positive electrode and a negative electrode is the same, The take-out position of an electrode plate is changed by inverting the front and back of the said polarizable electrode sheet.

  As a separator, a thin plate of a natural cellulose material having a thickness of 35 μm was used. The size and shape of the separator is configured to be slightly larger than the shape excluding the electrode plate portion of the polarizable electrode sheet.

  Subsequently, these three sheets were laminated in the order of a separator, a polarizable electrode sheet, a separator, a negative polarizable electrode sheet, and a separator to obtain an electrode laminate. One separator is always arranged at the uppermost part and the lowermost part of the electrode laminate. In this example, the number of stacked positive and negative polarizable electrode sheets per sample is four, and the total number of separators is nine. The dimensions excluding the electrode plate portion are the polarizability of the positive and negative electrodes. The electrode sheet is 53 mm × 70 mm, and the separator is 57 mm × 75 mm. The electrode plate formed on the polarizable electrode sheet extends from the short side of 53 mm in length, and the dimension of the extended part is 9 mm × 12 mm. The size and shape of the polarizable electrode sheets for the positive electrode and the negative electrode are not necessarily the same, but the number of separators is one more than the total number of polarizable electrode sheets for the positive and negative electrodes. There is a need to.

The external terminal plate was made of an aluminum material having a length of 20 mm, a width of 10 mm, and a thickness of 0.2 mm, and a region derived from the exterior film sheet had a length of 10 mm and a width of 10 mm. Eleven through-holes are formed in this external terminal plate by press working with a die, and 10 conductor connection contact branches sandwiched between the through holes and the area of one conductor connection contact branch is 5 mm ² . It was made to become. At this time, the formation area of the conductor connection contact branch is 50% with respect to the total area of the region derived from the exterior film sheet of the external terminal board. After that, a plurality of conductor connections projecting on both sides of the external terminal board by pressing the part that becomes the conductor connection contact branch sandwiched between the through holes so as to twist about both ends of the conductor connection contact branch as axes Form a contact branch. At this time, the protrusion amount from the surface of the external terminal plate was set to 0.8%, which is 300% with respect to the thickness of the external terminal plate. Next, nickel plating was applied to the surface of the external terminal plate derived from the exterior film sheet by an electroless plating method. The total number of manufactured external terminal boards is 290 (140 samples and 10 spares for defect compensation).

  Next, the positive electrode plate and the negative electrode plate extending from the electrode laminate were respectively bundled and collectively fixed to the end of the external terminal plate by ultrasonic welding to form an electrode body. On the other hand, the edges of three sides including the two long sides of the two exterior film sheets were thermocompression bonded, and a thermoplastic resin layer made of acid-modified polyolefin resin formed on the inner surface was joined to form a bag. The thickness of the thermoplastic resin layer on the inner surface of the exterior film sheet is 40 μm.

  The produced electrode body was inserted into two bag-shaped exterior film sheets, and an electrolytic solution was injected. As the electrolytic solution, a solution prepared by dissolving tetraethylammonium tetrafluoroborate in propylene carbonate to a concentration of 0.8 mol / l was used. After injecting the electrolytic solution, the remaining one side of the two exterior film sheets was sealed by thermocompression bonding in a vacuum atmosphere. A multilayer electric double layer capacitor was obtained by the above method. There are 140 electric double layer capacitors fabricated by this method.

(Comparative Examples 1-3: Case of conventional technology)
In the same manner as in Example 1, 140 electric double layer capacitors (40 for vibration test, 100 for contact resistance measurement) were produced for each condition described below. The dimensions of the produced electric double layer capacitor are exactly the same as those in the first embodiment.

  In Comparative Examples 1 to 3, a configuration similar to that of the external terminal plate described in Patent Document 1 as a prior art is applied to manufacture of an electric double layer capacitor. 10A and 10B are diagrams showing the configuration of an external terminal plate constituting a conventional electrochemical device, FIG. 10A is a top view, and FIG. 10B is a cross-sectional view taken along the line DD ′ in FIG. FIG. In Comparative Example 1, as shown in FIG. 10, φ8 mm through holes 16 were provided in the external terminal plate 12, and electroless nickel plating was applied to the surface of the region derived from the exterior film sheet of the external terminal plate 12. The subsequent steps are the same as those in the first embodiment. FIG. 11 is a perspective view showing an external appearance of an electrode body after an external terminal plate constituting a conventional electric double layer capacitor is attached. As shown in FIG. 11, the positive electrode plate 7 and the negative electrode plate 8 that are extended from the electrode laminate 6 and are respectively bundled are fixed to the end of the external terminal plate 12 by ultrasonic welding to form an electrode body. did. FIG. 12 is a perspective view of the appearance of a conventional electric double layer capacitor. The electrode body to which the external terminal plate 12 shown in FIG. 11 is attached is covered with an exterior film sheet 4 and sealed by injecting an electrolytic solution. At this time, 10 spare external terminal boards were prepared to prepare for the compensation when a defect occurred.

  Comparative Example 2 and Comparative Example 3 are cases in which the sizes of the through holes provided in the external terminal plate of Comparative Example 1 are different. In Comparative Example 2, φ5 mm and in Comparative Example 3 φ3.5 mm. Others are the same as those in Comparative Example 1.

(Examples 2 and 3: shape of conductor connection contact branch)
In the same manner as in Example 1, 140 electric double layer capacitors were produced for each condition described below. The dimensions of the produced electric double layer capacitor are exactly the same as those in the first embodiment.

  The difference between the sample in Examples 2 and 3 and the sample in Example 1 is only the shape of the conductor connection contact branch provided on the external terminal plate. It was evaluated whether there was any difference in the characteristics of the electric double layer capacitor depending on the shape of the conductor connection contact branch. Although there is a difference in shape, the area of the conductor connection contact branch actually produced is 50% of the total area of the external terminal plate derived from the exterior film sheet, and protrudes from the surface of the external terminal plate. The amount is set to 300% (projection thickness 0.8 mm), which is the same as that of Example 1. In Example 2, the conductor connection contact branch having the shape shown in FIG. 5 (B in Table 1) was formed. In Example 3, the conductor connection contact branch having the shape shown in FIG. 6 (C in Table 1) was formed.

(Examples 4 and 5: types of electrochemical devices)
The difference between the sample in Examples 4 and 5 and the sample in Example 1 is the type of electrochemical device. Unlike Example 1, the base material of the external terminal plate used for the negative electrode was a copper material having a thickness of 0.2 mm, and the positive electrode was an aluminum material similar to that of the example. 140 lithium ion secondary batteries and hybrid capacitors each using the same were produced, and Examples 4 and 5 were obtained, respectively. An external terminal plate having the same conductor connection contact branch shape, area, and protruding amount as in Example 1 was used. At this time, five spare positive electrode external terminal plates and five negative electrode external terminal plates were also prepared to prepare for compensation when a defect occurred.

  In the battery body in Example 4 which is a lithium ion secondary battery, first, a positive electrode portion having a positive electrode active material on an aluminum current collector, a separator, and a negative electrode portion having a negative electrode active material on a copper current collector are stacked. The body was made. Next, the positive electrode and the negative electrode plate protruding from the electrode laminate were respectively bundled and fixed to the end portions of the external terminal plate by ultrasonic welding to form an electrode body. At this time, when the positive electrode and the negative electrode plate are bundled, each electrode plate may be bent. On the other hand, the edges of three sides including the two long sides of the two exterior film sheets were thermocompression bonded, and the thermoplastic resin layers made of the respective acid-modified polyolefin resins formed on the inner surface were joined to form a bag. . The produced electrode body was inserted into the two package-like exterior film sheets, and an electrolyte solution was injected. The electrolytic solution is a lithium salt organic electrolytic solution. After injecting the electrolytic solution, the remaining one side of the two exterior film sheets was sealed by thermocompression bonding in a vacuum atmosphere. By the above method, a stacked lithium secondary battery was obtained.

  Moreover, in Example 5 which is a hybrid capacitor, the positive electrode part which has activated carbon in an aluminum electrical power collector, the separator, and the negative electrode part which has a negative electrode active material in the copper electrical power collector were laminated | stacked, and the electrode laminated body was produced. Next, the positive electrode and the negative electrode plate protruding from the electrode laminate were respectively bundled and fixed to the end portions of the external terminal plate by ultrasonic welding to form an electrode body. At this time, when the positive electrode and the negative electrode plate are bundled, each electrode plate may be bent. On the other hand, the edges of three sides including the two long sides of the two exterior film sheets were thermocompression bonded, and the thermoplastic resin layers made of the respective acid-modified polyolefin resins formed on the inner surface were joined to form a bag. . The produced electrode body was inserted into the two bag-shaped exterior film sheets, then lithium metal for lithium doping was inserted, and an electrolytic solution was injected. The electrolytic solution is a lithium salt organic electrolytic solution. Lithium ions were incorporated into the negative electrode by an electrochemical method. The fact that lithium was occluded in the negative electrode was confirmed by inserting a lithium metal reference electrode. After completion of lithium doping, the remaining one side of the two exterior film sheets was sealed by thermocompression bonding in a vacuum atmosphere. A multilayer hybrid capacitor was obtained by the above method.

  By the above method, as in the case of the electric double layer capacitor in Example 1, a lithium ion secondary battery and a hybrid capacitor having the same dimensions and using the same external terminal plate as in Example 1 were produced. Then, the presence or absence of differences depending on the type of electrochemical device was evaluated.

(Examples 6 to 14: plating type)
In the same manner as in Example 5, 140 hybrid capacitors were produced for each condition described below, and 5 spare positive external terminal plates and 5 negative external terminal plates were also produced. Prepared for time compensation. The dimensions and shape of the fabricated hybrid capacitor are exactly the same as in the first embodiment.

  The difference between the sample of Example 5 and the samples of Examples 6 to 14 is the kind of plating applied to the external terminal plate of the negative electrode and the presence or absence of plating. In Example 5, the surface of the negative external terminal plate (copper material) was nickel-plated, but in Example 6, it was chromium, Example 7 was tin, Example 8 was silver, Example 9 was platinum, Example 10 is gold, Example 11 is copper, Example 12 is rhodium, and Example 13 is palladium. Moreover, in Example 14, the thing which does not give a plating process was produced. The plating was carried out using the most suitable plating type. The positive terminal plate made of an aluminum material was subjected to electroless nickel plating in the same manner as in Examples 1 and 5. The subsequent steps are the same as in the case of Example 5. These samples were evaluated for the presence or absence of differences depending on the type of plating.

(Examples 15 to 17, Comparative Examples 4 to 6: conductor connection contact branch area ratio)
In the same manner as in Example 1, 140 electric double layer capacitors and 10 spare external terminal boards were produced for each condition described below. The dimensions of the produced electric double layer capacitor are exactly the same as those in the first embodiment.

The difference between the sample of Example 1 and the samples of Examples 15 to 17 and Comparative Examples 4 to 6 is only the formation area ratio of the conductor connection contact branch to the region derived from the exterior film sheet of the external terminal board. 5% in Comparative Example 4 ( ^two 2.5 mm ² conductor connection contact branches), 7% in Comparative Example 5 ( ^two 3.5 mm ² conductor connection contact branches), and 10% in Example 15 (2 .5mm 4 or the conductor connection contacts branch ^2), 30% in example 16 (six conductor connection contacts branch of 5 mm ^2), 90% in example 17 (15 a conductor connection contacts branch of 6 mm ²⁾ In Comparative Example 6, it was 95% (14 conductor connection contact branches of 6.8 mm ² ). Others are the same as those in the first embodiment. With these samples, including the case where the conductor connection contact branch formation area ratio in Example 1 was 50%, the conductor connection contact branch formation area ratio provided on the external terminal plate was changed from 5% to 95%. Multi-layer capacitors were respectively produced, and the presence or absence of differences in electric double layer capacitors due to differences in external terminal plates was evaluated.

(Examples 18 to 21: External terminal thickness)
In the same manner as in Example 1, 140 electric double layer capacitors and 10 spare external terminal boards were produced for each condition described below. The dimensions of the produced electric double layer capacitor are exactly the same as those in the first embodiment.

  The difference between the sample of Example 1 and the samples of Examples 18 to 21 is only the thickness of the external terminal plate. In Example 18, 0.1 mm, in Example 19, 0.3 mm, in Example 20, 0.4 mm, and in Example 21, 0.7 mm. Others are the same as those in the first embodiment. Thereby, including the case where the thickness of the external terminal plate in Example 1 is 0.2 mm, the thickness of the external terminal plate is changed from 0.1 mm to 0.7 mm, and the electric double layer capacitors are respectively produced. The presence or absence of a difference in the electric double layer capacitor due to the difference in thickness of the plate was evaluated.

(Examples 22 to 26, Comparative Examples 7 and 8: Protrusion amount of conductor connection contact branch)
In the same manner as in Example 1, 140 electric double layer capacitors and 10 spare external terminal boards were produced for each condition described below. The dimensions of the produced electric double layer capacitor are exactly the same as those in the first embodiment.

  The difference between the sample of Example 1 and the samples of Examples 22 to 26 and Comparative Examples 7 and 8 is only the protruding amount of the conductor connection contact branch. In Comparative Example 7, the thickness of the external terminal plate (0.2 mm) 10% (projection thickness 0.22 mm), Example 22 20% (projection thickness 0.24 mm), Example 23 50% (projection thickness 0.3 mm), Example 24 500% (projection thickness 1.2 mm), Example 25 700% (projection thickness 1.6 mm), Example 26 1000% (projection thickness 2.2 mm), Comparative Example 8 1200 % (Thickness of the protruding portion 2.6 mm). Others are the same as those in the first embodiment. Thereby, including the case where the protrusion amount in Example 1 is 300% (the protrusion thickness is 0.8 mm), the electric double layer capacitor is manufactured by changing the protrusion amount of the external terminal plate from 10% to 1200%. The presence or absence of a difference in the electric double layer capacitor due to the difference in the protrusion amount of the external terminal was evaluated.

(Evaluation methods)
The electrochemical devices produced in Examples 1 to 24 and Comparative Examples 1 to 8 were evaluated as follows. That is, there are two types: vibration test and contact resistance evaluation. In Examples 1 to 24 and Comparative Examples 1 to 8, 140 electrochemical devices were produced. In the evaluation, the electrochemical devices for which the two types of tests described above were produced were connected in series as shown in FIGS. FIG. 9 is a configuration diagram in which the electrochemical device of the present invention is connected in series via a connection bus bar. FIG. 9 (a) is a top view, FIG. 9 (b) is a side view, and FIG. 9 (c) is FIG. It is an enlarged view of the C section of (b). FIG. 13 is a configuration diagram in which conventional electrochemical devices are connected in series with a connection unit. FIG. 13 (a) is a top view, FIG. 13 (b) is a side view, and FIG. 13 (c) is FIG. It is an enlarged view of the E section of (b).

  Samples other than Comparative Examples 1 to 3 were connected in series by inserting the external terminal plate 12 of one positive electrode into the copper connection bus bar 17 as shown in FIG. 9 and inserting the other negative electrode into the groove of the connection bus bar. It was. At this time, each external terminal plate was bent in an L shape in advance so that it could be inserted into the connection bus bar. The opening interval of the connection bus bar was set to be 20% larger than the thickness of the external terminal board. In Comparative Examples 1 to 3, as shown in FIG. 11, the non-conductive connecting resin pedestal 18 is provided with a screw hole, and the positive external terminal plate and the negative external terminal plate bent in an L shape are connected to the connecting screws. The two electrochemical devices were connected in series by fixing to the connecting resin pedestal 18 at 19. In either case, in order to fix two electrochemical devices connected in series, a double-sided adhesive tape was applied to the surface of the overlapping exterior film sheet and fixed.

  Evaluation of the vibration test was performed by fixing two electrochemical device modules connected in series in each specification with the surface of the lower electrochemical device to a measuring machine with double-sided adhesive tape, and JIS C 5102 (Section 8.2.3). ), A vibration test of 10 to 55 Hz for 6 hours was performed in the X, Y, and Z axis directions. The number of vibration test evaluations was 20 modules (40 pieces) for each specification. The connection location after the above vibration test is observed with a microscope, and there is no positional shift, cracks, breakage, etc. of the external terminal board. With respect to other than ˜3, it was confirmed whether or not there was a positional shift between the connection bus bar and the external terminal plate connection part before and after the vibration test. Those that were confirmed to be loose, misaligned, or damaged were considered defective. The defect rate was calculated from the number of defects relative to the number of evaluations.

  The evaluation of the contact resistance test was conducted by charging a DC-connected module of two electrochemical devices in each specification with a predetermined voltage of each electrochemical device by a charging / discharging device for 1 hour, and then discharging at a current value of 10C. R (DC resistance) was measured. At this time, the single DC-R before serial connection was measured in the same manner, and the value obtained by subtracting the single DC-R value from the DC-R value of the electrochemical device that was serialized in two was the contact resistance value. It was. The number of contact resistance evaluations was 50 modules (100 pieces) for each specification. The contact resistance selection standard was the average contact resistance value of Example 1 + 3σ. Those larger than the screening standard were regarded as defective, and the defect rate was calculated from the number of defects relative to the evaluation number.

  By the above method, two kinds of evaluations of a vibration test and a contact resistance test were performed for each sample condition in Examples 1 to 24 and Comparative Examples 1 to 8, respectively. The results are shown in Table 1. In the item of the shape of the conductor connection contact branch, the shape of the first embodiment is denoted as A, the shape of the second embodiment as B, and the shape of the third embodiment as C.

  From the evaluation results of the two types of tests for each sample condition shown in Table 1, the following can be understood. That is, in the electrochemical device, when the multi-sided conductor connection contact branch protruding in the thickness direction from the external terminal surface is provided on the external terminal plate as in the present invention, in the evaluation of the vibration test and the contact resistance test. In all cases, good results are obtained (Examples and Comparative Examples 1 to 3).

  At this time, the formation area ratio of the conductor connection contact branch provided on the external terminal plate is preferably 10% to 90% with respect to the area of the external terminal plate derived from the exterior film sheet (Examples 1 and 13). ~ 15). When the formation area ratio of the conductor connection contact branches is smaller than 10%, the number of conductor connection contact branches and the contact area become small, so there is a possibility that the contact with the connection bus bar is insufficient, and the conduction failure due to vibration. Moreover, contact resistance becomes large (Comparative Examples 4 and 5). On the other hand, if it is larger than 90%, the area of the through-hole formed in the external terminal board is increased, resulting in insufficient strength of the external terminal board, leading to the occurrence of defects when manufacturing the external terminal board (comparison) Example 6).

  Further, it is preferable that the protruding amount of the conductor connection contact branch is 20% to 1000% (Examples 22 to 26). When the protruding amount is smaller than 20%, the contact pressure with the connection bus bar due to the spring effect of the conductor connection contact branch is small, so that the conduction failure due to vibration and the contact resistance increase (Comparative Example 7). On the other hand, when it is larger than 1000%, when processing the conductor connection contact branch on the external terminal board, the processing amount such as the torsional rotation angle and the bending angle becomes large, resulting in insufficient strength of the external terminal board. It is thought that it led to defect generation (Comparative Example 8).

  In addition, as a shape of the conductor connection contact branch provided on the external terminal plate, good results can be obtained in any shape of the conductor connection contact branch (A to C) evaluated this time (Examples 1 to 3). In addition, the type of plating applied to the conductor connection contact branch and the external terminal is good even if it is placed on any of nickel, chromium, tin, silver, platinum, gold, copper, rhodium, palladium, or an unplated aluminum substrate. Were obtained (Examples 6 to 12).

  Further, good results are obtained in any case where the thickness of the external terminal is 0.1 to 0.7 mm (Examples 1 and 18 to 21). Furthermore, any electrochemical device can be applied to any of an electric double layer capacitor, a lithium ion secondary battery, and a hybrid capacitor (Examples 1, 4, and 5).

  As described above, in the electrochemical device of the present invention, a plurality of conductor connection contact branches are provided on the external terminal plate, and a plurality of electrochemical devices are connected in series and parallel via the conductor connection contact branches / connection bus bars. . At this time, the conductor connection contact branch provided on the external terminal plate protrudes from the surface of the external terminal plate in the thickness direction, and the contact pressure between the conductor connection contact branch and the bus bar is stabilized for a long time by the structure in contact with the connection bus bar. Further, the contact resistance can be minimized. Further, the description of each of the above examples is for explaining the effect in the case of the embodiment of the present invention, thereby limiting the invention described in the scope of claims or the scope of claims. It does not reduce. Moreover, each part structure of this invention is not restricted to said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim.

The figure which shows the shape and internal structure of the electric double layer capacitor of this invention. 1A is a top view, FIG. 1B is a side view, and FIG. 1C is a cross-sectional view taken along the line A-A ′ of FIG. The figure which shows the structure of the electrode laminated body inside the electric double layer capacitor of this invention. 2A is a top view of the positive electrode portion, FIG. 2B is a view showing the separator, and FIG. 2C is a top view of the negative electrode portion. The perspective view of the electrode body which comprises the electric double layer capacitor of this invention. The figure which shows the structure of the external terminal board which comprises the electric double layer capacitor of this invention. 4A is a top view, FIG. 4B is a side view, and FIG. 4C is an explanatory view of a conductor connection contact branch. The figure which shows the other shape of a conductor connection contact branch. FIG. 5A is a top view and FIG. 5B is a side view. The figure which shows other shape of a conductor connection contact branch. 6A is a top view and FIG. 6B is a side view. The perspective view which shows the external appearance of the electrode body after attaching the external terminal board which comprises the electric double layer capacitor of this invention. The perspective view of the appearance of the electric double layer capacitor of the present invention. The block diagram which connected the electrochemical device of this invention in series via the connection bus bar. 9A is a top view, FIG. 9B is a side view, and FIG. 9C is an enlarged view of a portion C in FIG. 9B. The figure which shows the structure of the external terminal board which comprises the conventional electrochemical device. FIG. 10A is a top view, and FIG. 10B is a cross-sectional view taken along the line D-D ′ of FIG. The perspective view which shows the external appearance of the electrode body after attaching the external terminal board which comprises the conventional electrical double layer capacitor. The perspective view of the external appearance of the conventional electric double layer capacitor. The block diagram which connected the conventional electrochemical device in series with the connection unit. 13A is a top view, FIG. 13B is a side view, and FIG. 13C is an enlarged view of a portion E in FIG. 13B.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electric double layer capacitor 2 Positive electrode external terminal plate 3 Negative electrode external terminal plate 4 Exterior film sheet 5 Conductor connection contact branch 6 Electrode laminated body 7 Positive electrode plate 8 Negative electrode plate 9, 10 Bipolar electrode sheet 11 Separator 12 External terminal plate 13 Through-hole 15 Joint 16 Through-hole 17 Connection bus bar 18 Connection resin base 19 Connection screw

Claims (8)

  Incorporates an electrochemical element including a positive electrode and a negative electrode facing each other via a separator, a plurality of external terminal plates electrically connected to the positive electrode and the negative electrode, and the electrochemical element And an exterior film sealed at a portion, and at least a part of each of the external terminal plates is led out of the exterior film, the external terminal plate being an external device and a conductive member A plurality of conductor connection contact branches for electrical connection via the conductor connection contact branches in a region sandwiched between a plurality of through holes formed in at least a part of the external terminal plate An electrochemical device formed and protruding in a thickness direction of the external terminal plate, wherein the protruding conductor connection contact branch is in contact with and electrically connected to the conductive member.   The conductor connection contact branch has a shape in which both ends have a narrow width, are inclined toward the center, and the center has a wide width, and is twisted about the both ends in the thickness direction of the external terminal plate. 2. The electrochemical device according to claim 1, wherein a central portion of the protruding conductor connection contact branch is in contact with the conductive member.   2. The conductor connection contact branch has a triangular shape or a semicircular shape, and protrudes in a thickness direction of the external terminal plate, and a center portion of the protruded conductor connection contact branch is in contact with the conductive member. The electrochemical device according to 1.   The conductor connection contact branch protrudes 20 to 1000% with respect to the thickness of the external terminal plate, protrudes from a contact position with the conductive member, and is electrically connected to the conductive member in a state having a contact pressure. The electrochemical device according to any one of claims 1 to 3, wherein the electrochemical device is characterized in that:   5. The electrochemical device according to claim 1, wherein the conductor connection contact branch has a taper at least in part.   At least a part of one or more of nickel, chromium, tin, silver, platinum, gold, copper, rhodium, and palladium was used on the surface of at least a portion of the external terminal plate that is led out of the exterior film. The electrochemical device according to any one of claims 1 to 5, wherein at least one layer of plating treatment is performed.   The electrochemical device according to any one of claims 1 to 6, wherein the electrochemical device is any one of an electric double layer capacitor, a lithium ion secondary battery, and a hybrid capacitor.   The electrochemical device according to any one of claims 1 to 7, wherein a plurality of electrochemical device modules are connected in series or in parallel via a conductive member, and the thickness of the external terminal plate is increased. An electrochemical device module, wherein a plurality of protruding conductor connection contact branches are in contact with and electrically connected to the conductive member.

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