JP2009123889A - Electrochemical device, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrochemical device low in ESR; and its efficient manufacturing method. <P>SOLUTION: Electrode sheets 30 and separator sheets are alternately laminated on one lead frame, extraction parts of the electrode sheets 30 are connected to corresponding parts on the lead frame, a sealing sheet is arranged to cover the laminated product thus obtained, the sealing sheet is jointed, an electrolyte is filled from a slit of the sealing sheet, thereafter the laminated product is enclosed by jointing the part of the slit as well, and finally cut and separated into individual electrochemical devices, and thereby the plurality of electrochemical devices are manufactured at once. In this case, the extraction parts of electrodes of one-side polarity and the extraction parts of electrodes of the other-side polarity are located at positions different from each other, the extraction parts of the electrodes of the same polarity are arranged to match each other, and the extraction parts of the electrodes of the respective polarities are connected on corresponding exposed electrodes. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electrochemical device such as a secondary battery or an electric double layer capacitor.

  For example, in electric devices such as mobile phones, digital still cameras, laptop computers, and hybrid electric vehicles, secondary batteries such as lithium ion batteries and nickel metal hydride batteries, and electrochemical capacitors such as electric double layer capacitors and redox capacitors, etc. The so-called electrochemical devices capable of accumulating electric charges are widely used.

  As a conventional electrochemical device of this type, for example, in Patent Document 1 below, a current collector portion in which a positive electrode forming layer is arranged and a current collector portion in which a negative electrode forming layer is arranged are alternately arranged via separators. A laminate in which a required number of layers are stacked, a positive current extraction unit that extracts current from the current collector part in which the positive electrode forming layer is arranged, and a negative electrode extraction that extracts current in the current collector part in which the negative electrode forming layer is arranged In other words, a multilayer electric double layer capacitor is disclosed which includes a portion and is inserted into an outer case, impregnated with an electrolytic solution, and the outer case is sealed.

  Patent Document 2 below includes a first electrode, a separator sheet held in a mooring manner with respect to the first electrode, and a second electrode that comes into contact with the separator sheet, These electrodes are maintained in a separated configuration, and are further connected to each electrode and a housing for accommodating the electrode, the separator sheet, and the electrolyte, and enabling ion conduction between the electrodes. A supercapacitor is disclosed that includes two terminals for allowing external electrical connections of the two. Further, a groove extending in the width direction from one side of a continuous aluminum sheet having a carbon coating at the center is formed at a predetermined interval, and a plurality of the same aluminum sheet and a continuous separator sheet are provided along the longitudinal direction. A method of manufacturing the supercapacitor by joining with a roller while running is disclosed.

On the other hand, in recent years, electric double layer capacitors have been expected as an auxiliary power source for rapid rise of circuit load. In such applications, the equivalent series resistance (ESR) is low and the capacitance (C) is necessary and sufficient. It is required to be large.
JP 2006-339414 A Japanese translation of PCT publication No. 2004-515083

  However, in the multilayer electric double layer capacitor described in Patent Document 1, a positive electrode lead-out portion extended from a current collector portion where a positive electrode formation layer is arranged and a current collector where a negative electrode formation layer is arranged Since the negative electrode lead-out portion extended from the portion is extended to the outside of the outer case and connected to the terminal electrode outside the outer case, the strength at the connecting portion with the terminal electrode is insufficient The manufacturing workability was not good.

  In the method of manufacturing a supercapacitor described in Patent Document 2, a continuous aluminum sheet or a separator sheet is joined by a roller while running in the longitudinal direction. Then, there existed a problem that a manufacturing apparatus will enlarge.

  Accordingly, an object of the present invention is to provide an electrochemical device that can be manufactured with high reliability, high capacitance, low ESR, and good workability, and a method for manufacturing the same. .

  In order to achieve the above object, an electrochemical device of the present invention comprises a pair of exposed electrodes spaced in parallel with each other and a plurality of layers stacked alternately via separators so as to overlap the pair of exposed electrodes. An electrode, a part of the exposed electrode exposed to the outside, a sealing body covering the outer periphery of the stacked body of the exposed electrode, the separator and the electrode, and an electrolytic solution filled between the electrodes In the device, the electrodes are arranged such that a pair of electrodes having different polarities face each other with a separator interposed therebetween, and each electrode has an overlapping portion that overlaps the separator and a lead-out portion that protrudes from the overlapping portion, The lead-out portion of one polarity electrode and the lead-out portion of the other polarity electrode are located at different positions and are arranged so that the lead-out portions of the same polarity electrode are aligned with each other Are, each other lead portion of each of the polarity of the electrodes, characterized in that it is connected on the corresponding said exposed electrode.

  According to the electrochemical device of the present invention, a plurality of electrodes are alternately stacked via separators so as to overlap on a pair of exposed electrodes, and a lead portion of one polarity electrode and a lead electrode of the other polarity are drawn. Part is connected to the corresponding exposed electrode, a part of the exposed electrode is exposed to the outside, and the outer periphery of the laminate of the exposed electrode, the separator and the electrode is covered with a sealing body. The lead portions of the respective electrodes are joined to each other inside the sealing body, and this joined body is connected to the exposed electrode (terminal electrode), thereby increasing the bonding strength between the lead portion of the electrode and the exposed electrode. , Can increase the reliability. In addition, since the step of laminating each electrode and separator is performed on a pair of exposed electrodes and the lead electrodes of each electrode can be joined to each other and connected to the corresponding pair of exposed electrodes, the manufacturing workability is also improved. Furthermore, since a plurality of elements composed of a pair of electrodes having different polarities and a separator disposed between them are connected in parallel, the required capacitance can be increased by increasing the number of layers. It can be ensured and ESR can be lowered.

  In the electrochemical device of the present invention, the electrode is composed of a current collector and a polarizable electrode formed on a surface thereof, and the polarizable electrode is formed in an overlapping portion of the electrode, The electric body preferably has the overlapping portion and the lead-out portion. According to this aspect, it is possible to obtain an electric double layer capacitor in which a plurality of electrodes are stacked via the separator by connecting the lead-out portions of the current collector of the same polarity to the corresponding exposed electrodes. , Manufacturing workability is also improved.

The method for producing an electrochemical device of the present invention is the method for producing an electrochemical device described above,
One lead frame having the exposed electrode forming area for a plurality of devices, an electrode sheet having an electrode forming area corresponding to each exposed electrode forming area of the lead frame, and corresponding to each exposed electrode forming area of the lead frame Using a separator sheet having a separator forming region and a sealing sheet having a sealing body forming region corresponding to each exposed electrode forming region of the lead frame,
A slit for separating a pair of exposed electrodes is formed in the exposed electrode forming region of the lead frame, and the electrode forming region of the electrode sheet overlaps with the separator and protrudes from the separator. Forming a lead portion that overlaps one of the pair of exposed electrodes by a punch hole, and forming two types of electrode sheets, one where the lead portion overlaps one of the pair of exposed electrodes and one that overlaps the other, In the separator forming region of the separator sheet, an overlapping portion that is insulated so as not to short-circuit electrodes adjacent to each other in the stacking direction overlapping the electrode, and a portion that exposes a part of the exposed electrode and a lead portion of the electrode are exposed. Forming holes and
The two types of electrode sheets are alternately laminated on the lead frame via the separator sheet, and the lead electrodes protruding from the separator sheet of the electrode sheet are overlapped to form a corresponding exposed electrode of the lead frame. Connect to the area,
Leaving a runner part to keep the lead frame in one connected sheet state, punching out the periphery of the part constituting the electrochemical device of the lead frame, the electrode sheet and the separator sheet to form a gap;
In the sealing sheet, an opening for exposing the exposed portion of the exposed electrode and a slit located on one side of the electrochemical device are formed,
The sealing sheet is arranged so that the laminate of the lead frame, the electrode sheet, and the separator sheet is sandwiched between the sealing sheets, and the periphery of the electrochemical device of the sealing sheet arranged on the front and back of the laminate The part to be joined, leaving the slit forming part,
The electrolyte is filled between the layers of the laminate through the slit of the sealing sheet, and then the slit portion is also joined, and the laminate is sealed together with the electrolyte,
Finally, the periphery of the electrochemical device is completely cut and separated into individual electrochemical devices.

  According to the method for producing an electrochemical device of the present invention, electrode sheets and separator sheets are alternately laminated on one lead frame, and the lead-out portion of the electrode sheet is connected to the corresponding exposed electrode on the lead frame. Then, a sealing sheet is arranged so as to cover the laminate obtained in this way, the sealing sheet is joined, and after filling the electrolyte from the slit of the sealing sheet, the slit portion is also joined to form the laminate. Since it is sealed and finally cut and separated into individual electrochemical devices, it is possible to manufacture a plurality of electrochemical devices at the same time, and it is easy to handle individual sheets in the manufacturing process. Can be improved. Further, since a plurality of electrode sheets and separator sheets may be alternately stacked on one lead frame, the manufacturing apparatus does not increase in size.

  In the electrochemical device manufacturing method of the present invention, the electrode sheet is composed of a current collector sheet and a polarizable electrode formed on a surface thereof, and the polarizable electrode is formed in an overlapping portion overlapping the separator. In addition, it is preferable that the lead-out portion is formed at a portion protruding from the overlapping portion of the current collector sheet. According to this aspect, an electric double layer capacitor in which a plurality of electrodes are stacked through the separator is efficiently manufactured by connecting the lead-out portions of the current collectors of the same polarity to the corresponding exposed electrodes. be able to.

  According to the electrochemical device of the present invention, the lead portion of each electrode is connected to the exposed electrode (terminal electrode) inside the sealing body, so that the bonding strength between the lead portion of the electrode and the exposed electrode is high. Increases reliability. Moreover, since the lamination process of each electrode and a separator is performed on a pair of exposed electrodes and the lead electrode of each electrode can be connected on a corresponding pair of exposed electrodes, manufacturing workability is improved. Furthermore, since a plurality of elements composed of a pair of electrodes having different polarities and a separator disposed between them are connected in parallel, the required capacitance can be increased by increasing the number of layers. It can be ensured and ESR can be kept low.

  In addition, according to the method for manufacturing an electrochemical device of the present invention, a plurality of electrochemical devices can be manufactured at one time, and handling of individual sheets in the manufacturing process is facilitated, so that productivity is improved. Can do. Further, since a plurality of electrode sheets and separator sheets may be alternately stacked on one lead frame, the manufacturing apparatus does not increase in size.

  The electrochemical device of the present invention accumulates electric charges such as secondary batteries such as lithium ion batteries and nickel metal hydride batteries, and electrochemical capacitors such as electric double layer capacitors and redox capacitors. It is for discharge, and is suitably used for electric devices such as mobile phones, digital still cameras, notebook computers, and hybrid electric vehicles.

  Hereinafter, an embodiment in which the present invention is applied to an electrochemical capacitor which is a kind of electrochemical device will be described. 1 and 2 show an embodiment of the electrochemical device of the present invention applied to an electric double layer capacitor.

  As shown in FIGS. 1 and 2, the electrochemical device 10 has a pair of exposed electrodes 21 a and 21 b spaced apart by a predetermined distance. On the exposed electrodes 21 a and 21 b, a plurality of electrodes 31 are alternately stacked via separators 41. The electrode 31 includes a current collector 32 and a polarizable electrode 33 formed in a predetermined region on the surface of the current collector 32. Here, as the current collector 32, for example, a metal foil, a fiber sheet, a mesh; a carbon foil, a fiber sheet, a mesh; an organic conductive polymer foil, a fiber sheet, a mesh; a semiconductor sheet such as silicon is used. It is done. In addition, as a metal of the electrical power collector 32, aluminum, silver, copper, gold | metal | money, platinum, nickel, stainless steel, a foreign silver, a copper alloy etc. are used preferably, for example. As the polarizable electrode 33, a porous material such as activated carbon having a large specific surface area, carbon fiber, polyacene, hard carbon, cleaved graphite, or the like is used.

  The electrodes 31 are alternately arranged via the separators 41, and the electrodes 31 adjacent in the stacking direction have different polarities. A pair of electrodes 31 having different polarities are configured to face each other with a separator 41 interposed therebetween. The current collector 32 constituting the electrode 31 is extended so that one end thereof protrudes from the separator 41, thereby forming lead portions 32 a and 32 b. The lead portions 32a and 32b are alternately extended in opposite directions along the stacking direction, and the lead portions 32a extended on one side are the same as the lead portions 32b extended on the other side. It is designed to be polar. Then, the lead portions 32a extended to one side are overlapped with each other, and parallel resistance welding, spot welding, ultrasonic bonding, laser welding, etc. are applied to the corresponding exposed electrodes 21a, brazing, bonding using a conductive adhesive Similarly, the lead portions 32b extending to the other side are overlapped and connected to the corresponding exposed electrodes 21b in the same manner as described above.

  The separator 41 is a member that insulates a pair of electrodes 31 having different polarities and enables movement of ions in the electrolytic solution between the pair of electrodes 31. For example, polyethylene, polytetrafluoroethylene (PTFE), cellulose, It can be formed of an aramid resin or the like, or a porous polymer film, a nonwoven fabric, glass fiber or the like in which they are mixed.

Further, an electrolyte solution (not shown) is filled between the pair of electrodes 31. The electrolytic solution is not particularly limited, for example tetraethylammonium tetrafluoroborate (Et 4 _{NBF 4)} or, compounds represented by the following formula (i) is employed.

[R ₁ R ₂ R ₃ R ₄ N] ⁺ X ⁻ (i)
(Wherein, R ₁ to R ₄ is an unsaturated bond, ether bond, amide bond, or ester bond to be of good 1 to 6 carbon atoms having alkyl group, or, a nitrogen atom in the molecule Represents a C 4-6 cycloalkyl group, and X ⁻ represents ClO ₄ ⁻ , BF ₄ ⁻ , PF ₆ ⁻ , (CF ₃ SO ₂ ) ₂ N ⁻ , CF ₃ SO ₄ ⁻ , C ₂ F _5. sO ₄ ^- represents an anion such as).
The above electrolyte is dissolved in a solvent such as propylene carbonate (PC), acetonitrile, methoxyacetonitrile, 3-methoxypropionitrile, γ-butyrolactone, butylene carbonate, dimethyl carbonate, ethyl methyl carbonate, ethylene carbonate, sulfolane, 3-methyl sulfolane. Thus, an electrolytic solution is formed and filled between the pair of electrodes 31 having different polarities. In addition, since electrolyte containing fluorine may generate hydrofluoric acid when moisture enters, and the current collector 32 may be corroded, it must be strictly sealed with a sealing body 51 described later.

  The sealing body 51 covers the laminate of the exposed electrodes 21a and 21b, the electrode 31, and the separator 41 from above and below with a pair of sealing sheets 52a and 52b, and welds or bonds the peripheral edges of the sealing sheets 52a and 52b. Is formed. At this time, the pair of exposed electrodes 21a and 21b extends from the end edges of the sealing sheets 52a and 52b, and serves as a terminal connected to an external circuit. The sealing sheet 50 constituting the sealing body 51 is not particularly limited as long as it has non-moisture permeability and sufficient strength. For example, a laminate film having a synthetic resin film as a base material is preferably used. Is done. The constituent material of the laminate film is not particularly limited. Examples of the synthetic resin film as a base material include polypropylene, nylon, polyethylene terephthalate (PET), polyethylene, ethylene vinyl acetate copolymer resin, polyimide, and Teflon (registered trademark). Polyether ether ketone (PEEK), phenol resin, aramid resin and the like are preferably used. In addition, the laminate film may have a layer structure including a metal foil as a layer intended for a gas barrier or the like, and aluminum or the like is preferably used as the metal foil. Furthermore, when the sealing sheet 50 is joined by welding, it is preferable to provide a heat-weldable resin layer (heat-welding layer) on at least the inner surface, and in that case, the material of the heat-sealing layer It is preferable to use unstretched polypropylene (CPP) or the like.

  In this electrochemical device 10, a unit laminate body of an electric double layer capacitor is constituted by a pair of electrodes 31, a separator 41 disposed between them, and an electrolyte filled between the pair of electrodes 31. The unit laminated body has a structure in which a plurality of unit laminated bodies are laminated. When a voltage is applied from the outside to the pair of exposed electrodes 21a and 21b, a voltage is applied to the respective electrodes 31 through the lead portions 32a and 32b of the current collector 32, and the pair of electrodes 31 facing each other with the separator 41 interposed therebetween. , 31 are applied with positive and negative voltages. On the surface of the polarizable electrode 33 such as activated carbon, ions in the electrolyte move to form an electric double layer. This electric double layer becomes a capacitor, and when a voltage is applied, it is adsorbed to the electrode surface. Charging is performed by increasing the number of localized ions, and electric power can be obtained by discharging the ions. In this case, a plurality of the electrodes 31 are laminated via the separator 41, and one unit laminated body (in other words, one element) is constituted by the adjacent electrodes 31, and therefore the unit laminated body (element). Are connected in parallel. Therefore, ESR can be lowered and the capacitance can be increased by providing a plurality of unit laminate bodies (elements).

  In addition, since the lead portions 32a and 32b of the current collector 32 are respectively overlapped and connected to the corresponding exposed electrodes 21a and 21b, there is an advantage that the electrode terminal extraction structure is simple and easy to manufacture. .

  3 to 17 show an embodiment of a method for manufacturing an electrochemical device according to the present invention. This embodiment is a method of manufacturing a plurality of electrochemical devices 10 as shown in FIGS.

  FIG. 3 shows a method for processing the electrode sheet 30 to be the electrode 31. As shown in FIG. 2A, a polarizable electrode layer 35 is provided by applying a polarizable electrode material in a line shape to a current collector sheet 34 formed of, for example, aluminum foil. Next, as shown in FIG. 5B, the holes 36, 37a, 37b are formed between the polarizable electrode layers 35 and patterned. The through holes 36 are short in a direction perpendicular to the line direction of the polarizable electrode layer 35 and are formed in such a length that both ends do not reach the polarizable electrode layer 35. The extraction hole 37 a is long in the direction orthogonal to the line direction, and is formed with a length that both ends reach the polarizable electrode layer 35. The extraction hole 37b is slightly long in a direction orthogonal to the line direction, and is formed to have a length at which one end reaches the polarizable electrode layer 35. The punch holes 36, 37a, 37b are aligned in a direction orthogonal to the line direction and are arranged at predetermined intervals in the line direction. Further, as shown in FIG. 3C, the electrode sheet 30 is cut along the cutting line C to form individual sheet pieces. In this case, two types of sheet pieces (for example, the right side and the left side in FIG. 5C) are formed by the arrangement of the punch holes 36, 37a, and 37b, and when one sheet piece is overlaid on the other sheet piece, In the region A (electrode formation region in the present invention) to be an electrochemical device, in one sheet piece, the current collector sheet 34 protrudes downward with respect to the line of the polarizable electrode layer 35, and in the other sheet piece, The current collector sheet 34 protrudes upward from the line of the polarizable electrode layer 35.

  FIG. 4 shows a method of processing the separator sheet 40 that becomes the separator 41. FIG. 6A shows an unprocessed state of the separator sheet 40. From this state, as shown in FIG. 5B, a hole 42 is formed between the lines L overlapping the polarizable electrode layer 35. Are aligned at a predetermined interval in the line L direction and in a direction orthogonal to the line L. Further, as shown in FIG. 3C, the separator sheet 40 is cut at a predetermined length to create a plurality of sheet pieces. When the sheet pieces are stacked on the electrode sheet 30, the holes 42 are located at predetermined intervals on both sides of the polarizable electrode layer 35 in the region A (separator forming region in the present invention) to be an individual electrochemical device. To do. The edge formed by the hole 36 of the current collector sheet 34 protrudes inside the hole 42 of the separator sheet 40, and the edge formed by the hole 37a or 37b of the current collector sheet 34 is The separator sheet 40 is covered.

  FIG. 5 shows a method for processing the lead frame 20 to be the exposed electrodes 21a and 21b. FIG. 4A shows the unprocessed state of the lead frame 20, and examples of the lead frame 20 include a Cu alloy plate (for example, a Cu—Ni—Co alloy plate) plated with Ni, and a stainless plate with Ni. A metal plate having a thickness of about 50 μm to 0.8 mm made of plated material or the like is used. From this state, as shown in FIG. 5B, the slits 22 are arranged at substantially the center of the line L overlapping the polarizable electrode layer 35 at a predetermined interval and in a direction perpendicular to the line L. Form. Further, as shown in FIG. 3C, the lead frame 20 is cut at a predetermined length to create a plurality of sheet pieces. Region A in the figure represents a region to be an individual electrochemical device.

  FIG. 6 shows a method for laminating the electrode sheet 30, the separator sheet 40 and the lead frame 20 thus formed. That is, the lead frame 20 is disposed at the lowest position, the separator sheet 40 is disposed thereon, the electrode sheet 30 is disposed thereon, the separator sheet 40 is disposed thereon, and the electrode sheet 30 is disposed thereon. A plurality of separator sheets 40 and electrode sheets 30 are alternately stacked on a single lead frame 20. In this case, as described above, the electrode sheet 30 has sheet pieces of two types of patterns (electrode sheets 30a and 30b in FIG. 6). Therefore, sheet pieces having different patterns are alternately stacked. And the area | region A used as each electrochemical device is laminated | stacked so that it may align for every sheet | seat.

  Then, each electrode sheet 30 is insulated by the separator sheet 40, and the edge formed by the punch hole 36 protrudes from the punch hole 42 of the separator sheet 40 in the region A to be an individual electrochemical device. The edge formed by 37a or 37b is covered with the separator sheet 40. As a result, for example, in the electrode sheet 30a of FIG. 6, the upper right edge in the illustrated region A protrudes from the punch hole 42 of the separator sheet 40, and in the adjacent electrode sheet 30b, the lower left edge in the illustrated region A is the separator. The sheet 40 protrudes from the hole 42. In this way, the pair of electrode sheets 30a and 30b that face each other with the separator sheet 40 interposed therebetween are configured such that, in the corresponding region A, the opposite edges protrude from the punch holes 42 of the separator sheet 40, respectively. .

  FIG. 7 shows the overlapping state of the sheets thus laminated. FIG. 6A is an explanatory diagram showing the overlapping state of each punched hole (in order to make the illustration easy to understand, the place which should be a hidden line is also indicated by a solid line), and FIG. It is an enlarged plan view of the area | region A used as this electrochemical device. That is, in the region A, the slit 22 of the lead frame 20 is disposed within the width of the polarizable electrode layer 35 of the electrode sheet 30, and one side of the polarizable electrode layer 35 is opened by the through hole 37 a or 37 b, The edge of the punched hole 42 of the separator sheet 40 is viewed from the opening, and the other side of the polarizable electrode 35 extends until the edge of the current collector sheet 34 reaches the punched hole 36 and protrudes from the edge of the separator 40. In the position.

  FIG. 8 is a cross-sectional view taken along line M in FIG. On the lead frame 20, a plurality of electrode sheets 30 are alternately stacked via the separator sheets 40, and the portion that becomes the edge of the hole 36 of the electrode sheet 30 is from the edge of the hole 42 of the separator sheet 40. Also protrudes, and these become the aforementioned lead portions 32a and 32b of the current collector 32. Looking at one region A, the protruding directions of the lead-out portions 32a and 32b change for each electrode sheet 30 to be laminated, and alternately protrude in the opposite direction.

  After the sheets are stacked in this manner, as shown in FIG. 9, the lead portions 32a and 32b protruding in the same direction of the electrode sheet 30 are joined to each other, and parallel resistance welding and spot welding are performed on the corresponding lead frames 20. Bonding is performed by methods such as ultrasonic bonding and laser welding. As a result, the electrode sheet 30 having the lead-out portion 32a protruding to one side with respect to the polarizable electrode layer 35 is connected to the left side in the drawing with the slit 22 of the lead frame 20 interposed therebetween. The electrode sheet 30 having the lead-out portion 32 b protruding to the other side is connected to the right side in the figure with the slit 22 of the lead frame 20 interposed therebetween.

  Next, as shown in FIG. 10, punch holes 61 are formed by punching out both sides of the region A to be an individual electrochemical device. As a result, each area A is connected through the runner 62.

  FIG. 11 shows a processing method of the sealing sheet 50 that forms the sealing body 51. That is, as shown in FIG. 6A, a sealing sheet 50 made of a laminate film or the like as described above is prepared, and both sides of the line L overlapping the polarizable electrode layer 35 as shown in FIG. In addition, openings 53a and 53b aligned in a direction perpendicular to the line L are formed. The opening 53a sandwiched between the lines L is wider than the opening 53b having the line L only on one side. The rows of the openings 53a and 53b are arranged at predetermined intervals along the line L direction. Further, slits 54 that cross the line L are formed in every two rows between the rows of the openings 53a and 53b. And as shown in the figure (c), the sealing sheet 50 is cut | disconnected by predetermined length, and a some sheet piece is created. Region A in the figure represents a region to be an individual electrochemical device.

  Next, the sealing sheet 50 is disposed so that the pair of sheet pieces of the sealing sheet 50 sandwich the laminate laminated on the lead frame 20. This state is shown in FIGS. 12 (a) and 12 (b). A portion located in the region A of the sealing sheet 50 is covered with the sealing sheet 50 except for an extended portion of the lead frame 20. Moreover, since the large punching holes 61 are formed on both sides of the region A to be an electrochemical device, the upper and lower sealing sheets 50 can be joined through the punching holes 61.

  FIG. 13 is a cross-sectional view taken along line M in FIG. 12B, and the portions of the openings 53 a and 53 b of the sealing sheet 50 are portions where only the lead frame 20 is exposed. The region A to be an individual electrochemical device is in a state where the upper and lower surfaces thereof are covered with the sealing sheet 50.

  Next, in the above state, the sealing sheet 50 located at the periphery of the region A is joined by means such as heat welding and adhesion except for the portion where the slit 54 is located. The upper and lower sealing sheets 50 are joined to each other at a portion located in the punch hole 61 (see FIG. 12A), and seal one side of the electrochemical device. However, the part which becomes the other side of an electrochemical device is left in the state opened by the slit 54. Further, in the portion where the openings 53a and 53b are located, the lead frame 20 is in a state of being joined to the surface of the lead frame 20 and protruding.

  FIG. 15 shows a state in which an electrolytic solution to be an electrolytic solution is filled and the electrochemical device is separated. As shown in FIG. 5A, the stacked sheets are folded along the line where the slits 54 are positioned so that the slits 54 can be easily opened. In this state, as shown in FIG. 5B, the electrolytic solution F flowing out from the nozzle 71 is injected into the inside through the slit 54. The electrolytic solution F is filled between the electrodes as an electrolytic solution.

  Next, as shown in FIG. 5C, the slit 54 is joined by means such as heat welding using a joining iron 72 or the like, and the periphery of the region A to be an electrochemical device is sealed with a sealing sheet 50. Seal completely.

  Further, as shown in FIG. 4D, the periphery of the region A to be an electrochemical device is cut and separated into individual electrochemical devices 10.

  The electrochemical device 10 thus obtained has the same structure as the electrochemical device 10 shown in FIGS. That is, the lead frame 20 remains as the exposed electrodes 21 a and 21 b in FIG. 1, the separator sheet 40 becomes the separator 41, and the electrode sheet 30 becomes the electrode 31. Further, the sealing sheet 50 becomes a sealing body 51 that seals the structure of the electrochemical device 10.

  Thus, according to the method for manufacturing an electrochemical device of the present invention, the lead frame 20, the electrode sheet 30, the separator sheet 40, and the sealing sheet 50 in which a plurality of regions A to be electrochemical devices are formed are laminated, A plurality of electrochemical devices 10 can be manufactured at a time by appropriately punching and cutting.

  In addition, in the manufacturing method of the electrochemical device of this invention, the punching pattern of each sheet | seat is not limited to the pattern of the said embodiment, Various patterns can be employ | adopted.

  FIG. 16 shows another embodiment of the electrochemical device according to the present invention. Note that substantially the same parts as those shown in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted. This electrochemical device 10a is characterized in that end portions of the exposed electrodes 21a and 21b protruding from the sealing body 51 are bent downward to form terminal portions 21c and 21d having shapes that easily come into contact with a substrate or the like. , Different from the previous embodiment.

  FIG. 17 shows still another embodiment of the electrochemical device according to the present invention. In the same manner as described above, parts that are substantially the same as those shown in FIGS. In this electrochemical device 10b, openings 55 and 55 are formed in portions of the sealing sheet 52b covering the lower surface in contact with the exposed electrodes 21a and 21b. The peripheral edges of the openings 55 and 55 are joined to the corresponding exposed electrodes 21a and 21b. The exposed electrodes 21a and 21b are exposed to the outside through the openings 55 and 55, and are connected to an external electric circuit there. In this embodiment, the end portions of the exposed electrodes 21a and 21b are also covered by the sealing body 51, and the peripheral edges of the openings 55 and 55 are joined to the exposed electrodes 21a and 21b without a step. It can seal more airtightly.

It is sectional drawing which shows one Embodiment of the electrochemical device of this invention. It is a top view of the electrochemical device. It is explanatory drawing which shows the processing method of the electrode sheet in one Embodiment of the manufacturing method of the electrochemical device of this invention. It is explanatory drawing which shows the processing method of the separator sheet in the manufacturing method. It is explanatory drawing which shows the processing method of the lead frame in the manufacturing method. It is a perspective view which shows the lamination | stacking method of each sheet | seat in the manufacturing method. The overlapping state of each laminated | stacked sheet | seat in the manufacturing method is shown, (a) is explanatory drawing which shows the overlapping state of each punching hole, (b) is an enlarged plan view of the area | region A used as each electrochemical device. It is sectional drawing along the line M of FIG.7 (b). In the manufacturing method, it is sectional drawing which shows the state which joins the extraction | drawer part of an electrode to a corresponding exposed electrode. In the manufacturing method, it is explanatory drawing which shows the state which punched both sides of the area | region A used as an electrochemical device. In the manufacturing method, it is explanatory drawing which shows the processing method of a sealing sheet. In the manufacturing method, a state in which the sealing sheet is covered is shown, (a) is an explanatory view showing an overlapped state of each punched hole, and (b) is an enlarged plan view of a region A to be an individual electrochemical device. It is sectional drawing along the line M of FIG.12 (b). In the manufacturing method, it is sectional drawing which shows the state which joined the sealing sheet. It is explanatory drawing which shows the state which fills the electrolyte solution used as electrolyte solution, and isolate | separates an electrochemical device in the manufacturing method. It is sectional drawing which shows other embodiment of the electrochemical device of this invention. It is sectional drawing which shows other embodiment of the electrochemical device of this invention.

Explanation of symbols

10, 10a, 10b Electrochemical device 20 Lead frame 21a, 21b Exposed electrode 22 Slit 30 Electrode sheet 31 Electrode 32 Current collector 32a, 32b Lead-out part 33 Polarized electrode 40 Separator sheet 41 Separator 42 Punch hole 50 Sealing sheet 51 Sealing Stopper 53a, 53b Opening 54 Slit 61 Hole

Claims (4)

A pair of exposed electrodes spaced apart in parallel with each other, a plurality of electrodes stacked alternately via separators so as to overlap the pair of exposed electrodes, and a part of the exposed electrodes are exposed to the outside. In an electrochemical device comprising a sealing body that covers the outer periphery of the laminate of the exposed electrode, the separator and the electrode, and an electrolyte solution filled between the electrodes,
The electrodes are arranged such that a pair of electrodes having different polarities face each other with a separator interposed therebetween, and each electrode has an overlapping portion that overlaps with the separator and a lead-out portion that protrudes from the overlapping portion. The electrode lead-out portion and the other polarity electrode lead-out portion are located at different positions, and are arranged so that the same polarity electrode lead-out portions are aligned with each other. An electrochemical device, wherein the devices are connected to the corresponding exposed electrodes.   The electrode is composed of a current collector and a polarizable electrode formed on a surface thereof, and the polarizable electrode is formed in an overlapping portion of the electrode, and the current collector is formed with the overlapping portion. The electrochemical device according to claim 1, further comprising the drawer portion. A method for producing an electrochemical device according to claim 1 or 2,
One lead frame having the exposed electrode forming area for a plurality of devices, an electrode sheet having an electrode forming area corresponding to each exposed electrode forming area of the lead frame, and corresponding to each exposed electrode forming area of the lead frame Using a separator sheet having a separator forming region and a sealing sheet having a sealing body forming region corresponding to each exposed electrode forming region of the lead frame,
A slit for separating a pair of exposed electrodes is formed in the exposed electrode forming region of the lead frame, and the electrode forming region of the electrode sheet overlaps with the separator and protrudes from the separator. Forming a lead portion that overlaps one of the pair of exposed electrodes by a punch hole, and forming two types of electrode sheets, one where the lead portion overlaps one of the pair of exposed electrodes and one that overlaps the other, In the separator forming region of the separator sheet, an overlapping portion that is insulated so as not to short-circuit electrodes adjacent to each other in the stacking direction overlapping the electrode, and a portion that exposes a part of the exposed electrode and a lead portion of the electrode are exposed. Forming holes and
The two types of electrode sheets are alternately laminated on the lead frame via the separator sheet, and the lead electrodes protruding from the separator sheet of the electrode sheet are overlapped to form a corresponding exposed electrode of the lead frame. Connect to the area,
Leaving a runner part to keep the lead frame in one connected sheet state, punching out the periphery of the part constituting the electrochemical device of the lead frame, the electrode sheet and the separator sheet to form a gap;
In the sealing sheet, an opening for exposing the exposed portion of the exposed electrode and a slit located on one side of the electrochemical device are formed,
The sealing sheet is arranged so that the laminate of the lead frame, the electrode sheet, and the separator sheet is sandwiched between the sealing sheets, and the periphery of the electrochemical device of the sealing sheet arranged on the front and back of the laminate The part to be joined, leaving the slit forming part,
The electrolyte is filled between the layers of the laminate through the slit of the sealing sheet, and then the slit portion is also joined, and the laminate is sealed together with the electrolyte,
Finally, the periphery of the electrochemical device is completely cut and separated into individual electrochemical devices.   The electrode sheet is composed of a current collector sheet and a polarizable electrode formed on a surface thereof, and the polarizable electrode is formed in an overlapping portion overlapping the separator, and the lead-out portion is the collector. The method for producing an electrochemical device according to claim 3, wherein the electrochemical device is formed in a portion protruding from the overlapping portion of the electric sheet.

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