JP4945897B2 - Assembled battery, composite assembled battery, and method of manufacturing assembled battery - Google Patents

Description

  The present invention relates to an assembled battery in which a plurality of batteries are combined, and a composite assembled battery in which the assembled batteries are combined. The battery of the present invention is used, for example, as a motor driving power source for an electric vehicle or the like.

  In recent years, there has been a strong demand for the introduction of electric vehicles (EV), hybrid vehicles (HEV), and fuel cell vehicles (FCV) against the background of the increasing environmental protection movement, and these motor drive batteries have been developed. Yes. As these motor drive batteries, rechargeable secondary batteries are used. Since EV, HEV, and FCV require high output and high energy density, it is virtually impossible to cope with a single large battery. Therefore, it is common to use an assembled battery in which a plurality of batteries are combined in series so that a desired voltage can be obtained.

However, when a battery is connected via a connection portion, the number of parts for connection and the number of assembling steps increase, and the manufacturing efficiency decreases. Further, the output is reduced by the electrical resistance of the connection portion. In addition, the space for the connection portion reduces the output density and energy density of the battery. As a means for reducing the electrical resistance of the connection part and reducing the volume occupied by the connection part, for example, a bipolar battery in which a positive electrode active material and a negative electrode active material are arranged on both sides of a current collector is disclosed (for example, Patent Document 1).
JP 2004-95400 A

  An object of the present invention is to provide a means for efficiently manufacturing an assembled battery.

  The present invention is an assembled battery having two or more batteries formed on a substrate using an ink jet method and a conductor portion that is formed using an ink jet method and electrically connects the batteries.

  In addition, the present invention is an assembled battery including two or more batteries formed on a substrate using an ink jet method and a semiconductor portion formed using the ink jet method and capable of electrically connecting the batteries.

  The present invention also includes a step of ejecting positive electrode ink containing a positive electrode active material by an ink jet method to form a positive electrode, a step of ejecting negative electrode ink containing a negative electrode active material by an ink jet method to form a negative electrode, and conductive particles And ejecting a conductor ink containing the ink jet method to form a conductor portion existing between the positive electrode and the negative electrode.

  When manufacturing an assembled battery using an inkjet system, it is possible to omit a special step for battery connection and improve the manufacturing efficiency of the assembled battery. Moreover, the series and parallel of a cell can be easily changed by changing the application | coating location of the conductor part and semiconductor part which connect a battery. For this reason, the design change according to a required voltage is easy. Furthermore, the space required for connecting the cells can be reduced, and the energy density can be improved.

  One embodiment of the assembled battery of the present invention includes two or more batteries formed on a substrate using an ink jet method, and a conductor portion that is formed using an ink jet method and electrically connects the batteries. It is an assembled battery. The ink jet method means a printing method in which liquid ink is ejected from a nozzle and ink is attached to an object. The ink jet method is classified into a piezo method, a thermal ink jet method, and a bubble jet (registered trademark) method according to a method of ejecting ink. The details of the ink jet system will be described in detail in the description of the method for manufacturing a battery pack.

  FIG. 1 is a top view of an embodiment of the assembled battery of the present invention. FIG. 2 is a bottom view of the assembled battery of FIG. In FIGS. 1 and 2, the current collector and the electrolyte are not shown for convenience of explanation. FIG. 3 is a schematic cross-sectional view taken along the “III-III” plane of the battery of FIGS. 1 and 2.

  The assembled battery of FIGS. 1 to 3 has four unit cells arranged on the substrate 10. In the following description, a battery unit composed of one positive electrode and one negative electrode will be referred to as a “single cell” for the purpose of distinguishing from an assembled battery. The upper left unit cell and the upper right unit cell in FIG. 1 are arranged such that the upper surface side is a positive electrode and the lower surface side is a negative electrode. The lower left cell and the lower right cell in FIG. 1 are arranged so that the upper surface side is a negative electrode and the lower surface side is a positive electrode.

  The unit cell has a structure in which a current collector 40, a positive electrode 50, an electrolyte layer 60, a negative electrode 70, and a current collector 40 are stacked in this order. Although FIG. 3 shows an aspect in which the electrolyte layer 60 is shared by a plurality of single cells, separate electrolyte layers may be arranged for each single cell. Further, on the upper surface side of FIG. 3, one current collector 40 is arranged for each unit cell. As shown in the figure, the batteries are electrically connected by a conductive portion 20 having electrical conductivity. In some cases, one current collector may be shared by a plurality of single cells.

  The electrical connection will be described with reference to the drawings. The unit cell disposed on the upper left and the unit cell disposed on the upper right are electrically connected on the positive electrode side by the conductor portion 20 formed on the upper surface side ( FIG. 1). Similarly, the lower left unit cell and the lower right unit cell are electrically connected on the negative electrode side by a conductor portion 20 formed on the upper surface side. On the other hand, the upper left battery and the upper right battery are isolated by the insulating portion 30 and are not electrically connected on the negative electrode side (FIG. 2). Similarly, the lower left unit cell and the lower right unit cell are isolated by the insulating portion 30 on the lower surface side and are not electrically connected.

  In the upper left unit cell and the lower left unit cell, the positive electrode and the negative electrode are connected to each other by the conductor portion 20 on the lower surface side (FIG. 2). Similarly, in the upper right unit cell and the lower right unit cell, the positive electrode and the negative electrode are connected by the conductor portion 20 on the lower surface side.

  As for the connection of the unit cells in the assembled battery, the upper left unit cell and the lower left unit cell are connected in series. The upper right cell and the lower right cell are also connected in series. A combination in which two batteries are connected in series is connected in parallel. That is, as shown in FIG. 4, it is a 2 parallel-2 series assembled battery.

  When a battery is manufactured using an inkjet method, it is possible to easily change the series and the parallel and adjust the voltage of the assembled battery simply by controlling the application part of the conductor portion. For example, when it is desired to improve the output of the assembled battery, the conductor portion 20 is formed as described in FIGS. 5 and 6 and the single cells are connected in series. FIG. 5 is a top view of another embodiment of the assembled battery of the present invention. 6 is a bottom view of the battery pack of FIG. 5 and 6, the current collector and the electrolyte are not shown for convenience of explanation.

  The cells in the assembled battery are connected in series in the order of lower left → upper left → lower right → upper right. That is, as shown in FIG. 7, it is a 4-series assembled battery.

  Another embodiment of the assembled battery of the present invention includes two or more batteries formed on a substrate using an ink jet method, and a semiconductor portion formed using the ink jet method and capable of electrically connecting the batteries. It is an assembled battery. Instead of the conductor portion connecting the single cells, the conductor and the insulating portion can be controlled by control from the outside, and a semiconductor portion having a property as a conductor is disposed. In the present application, “electrically connectable” means to be electrically connected at least under certain circumstances. For example, the semiconductor portion is formed by an inkjet method using a semiconductor ink containing an organic semiconductor.

  FIG. 8 is a top view of one embodiment of the assembled battery of the present invention. FIG. 9 is a bottom view of the assembled battery of FIG. In FIGS. 8 and 9, the current collector and the electrolyte are not shown for convenience of explanation. FIG. 10 is a schematic cross-sectional view of the battery shown in FIGS. 8 and 9 on the “XX” plane.

  The electrical connection will be described with reference to the drawings. The unit cell arranged at the upper left and the unit cell arranged at the upper right are arranged by the semiconductor unit 80 so as to be electrically connectable. The semiconductor portion 80 can control the conductor and the insulating portion by the semiconductor signal line 90. When the output of the assembled battery is required, the cells are connected in series so as to be in the mode shown in FIGS. 5 and 6 by the control through the semiconductor signal line 90. Thereby, the output of the assembled battery can be increased. When no output is required for the assembled battery, or when any one of the assembled batteries fails, two cells are arranged in parallel so as to be in the mode shown in FIGS. 1 and 2 by the control through the semiconductor signal line 90. -Connect in series.

  In addition, the combination of an assembled battery and the arrangement | positioning location of a semiconductor part are not specifically limited. The number of single cells constituting the assembled battery is selected from an arbitrary number of 2 or more. The number of cells in the assembled battery and the manner of connection may be determined according to the output and capacity required for the battery. When the assembled battery is configured, the stability of the battery is increased as compared with the single battery, and the influence on the entire battery due to the deterioration of one cell can be reduced. What is necessary is just to determine the arrangement | positioning location of a semiconductor part according to the output fluctuation | variation anticipated to an assembled battery. For example, when it is desired to be able to change between 2 parallel-2 series and 4 series, the semiconductor portion only needs to be arranged on the upper surface as shown in FIG. That is, the semiconductor part 80 in FIG. 9 may be the conductor part 20. In view of the fact that semiconductor materials such as organic semiconductors included in the semiconductor part are generally expensive and the cost of forming semiconductor signal lines for controlling the semiconductor part is taken into account, the number of semiconductor parts is reduced as much as possible. It is preferable to suppress the manufacturing cost of the battery.

  Subsequently, materials constituting the single battery and the assembled battery will be described.

  The substrate 10 is not particularly limited as long as it is an insulating material. As an insulating material, resin is mentioned, for example.

  The conductor part 20 is comprised from the material which can be formed using an inkjet system. Preferably, a material that has electronic conductivity but does not have conductivity with respect to ions that function as charge carriers in the battery is used. For example, the conductor portion 20 is made of conductive particles such as aluminum particles, SUS particles, carbon fine particles, silver particles, gold particles, copper particles, titanium particles, carbon black, and acetylene black. Alloy particles may be used.

  The conductor part including the conductive particles preferably further includes a binder that binds the conductive particles. By using a binder as the constituent material, the binding of the conductive particles can be increased and the reliability of the battery can be increased. The binder is preferably selected from materials that can withstand the applied voltage.

  The binder is preferably polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), styrene butadiene rubber (SBR), polyacrylonitrile (PAN), polymethyl acrylate (PMA), polymethyl methacrylate (PMMA). , Polyvinyl chloride (PVC), polyvinylidene fluoride (PVdF), or a mixture thereof. These materials have a very wide potential window, are stable in a wide range with respect to both the positive electrode potential and the negative electrode potential, and can improve adhesion. More preferably, polyvinylidene fluoride is used as the binder. Since polyvinylidene fluoride has high reliability and is often used as a binder for both electrodes, it is possible to improve the adhesion to each electrode.

  The insulating part 30 is a part having no conductivity. If it is a material which does not have electroconductivity, it will not specifically limit. As a material used as the insulating part, preferably, polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), styrene butadiene rubber (SBR), polyacrylonitrile (PAN), polymethyl acrylate (PMA), Examples thereof include polymethyl methacrylate (PMMA), polyvinyl chloride (PVC), polyvinylidene fluoride (PVdF), and mixtures thereof. In some cases, the insulating unit 30 may be the atmosphere. That is, no substance is disposed in a portion corresponding to the insulating portion, and an ambient atmosphere having insulating properties is usually used as the insulating portion.

  The current collector 40 may be formed from a metal foil such as an aluminum foil or a copper foil. The current collector may be composed of conductive particles, like the conductor portion 30. When the current collector is composed of conductive particles, it is preferable to use a binder as in the case of the conductor portion. Since specific examples of the conductive particles and specific examples of the binder are the same as those described for the conductor portion, description thereof is omitted here.

  The configurations of the positive electrode 50 and the negative electrode 70 are not particularly limited, and known positive electrodes and negative electrodes are applicable. The positive electrode includes a positive electrode active material, and the negative electrode includes a negative electrode active material. What is necessary is just to select a positive electrode active material and a negative electrode active material suitably according to the kind of battery.

For example, if the battery is the lithium secondary battery, as a cathode active material, Li · Co-based composite oxide such as LiCoO _2, Li · Ni-based composite oxide such as LiNiO _2, spinel LiMn ₂ O ₄ Li · Mn based composite oxide, Li · Fe based composite oxide such as LiFeO _2, and the like. In addition, transition metal and lithium phosphate compounds and sulfate compounds such as LiFePO ₄ ; transition metal oxides and sulfides such as V ₂ O ₅ , MnO ₂ , TiS ₂ , MoS ₂ , and MoO ₃ ; PbO ₂ , AgO, NiOOH etc. are mentioned. In some cases, two or more positive electrode active materials may be used in combination.

Examples of the negative electrode active material used for the lithium secondary battery include carbon materials such as a crystalline carbon material and an amorphous carbon material, and metal materials such as Li ₄ Ti ₅ O ₁₂ . Specific examples include natural graphite, artificial graphite, carbon black, activated carbon, carbon fiber, coke, soft carbon, and hard carbon. In some cases, two or more negative electrode active materials may be used in combination.

The electrode may contain other components such as a conductive additive, an ion conductive polymer, and a supporting salt. Examples of the conductive assistant include acetylene black, carbon black, and graphite. By including a conductive additive, the conductivity of electrons generated at the electrode can be increased, and the battery performance can be improved. Examples of the ion conductive polymer include polyethylene oxide (PEO) and polypropylene oxide (PPO). The supporting salt may be selected according to the type of battery. If the battery is a lithium secondary _{battery, LiBF 4, LiPF 6, Li} (SO 2 CF 3) 2 N, LiN (SO 2 C 2 F 5) 2, and the like.

  The amount of the electrode constituent material such as the active material, the lithium salt, and the conductive additive is preferably determined in consideration of the intended use of the battery (output importance, energy importance, etc.) and ion conductivity.

  The electrolyte layer 60 may be a liquid, gel, or solid phase. The electrolyte layer is preferably a gel polymer electrolyte layer or an all-solid electrolyte layer from the viewpoint of safety when the battery is damaged and the complexity of the battery structure for preventing liquid junction.

  By using the gel polymer electrolyte layer as the electrolyte, the fluidity of the electrolyte is lost, and the outflow of the electrolyte to the current collector can be suppressed. Examples of the gel electrolyte host polymer include PEO, PPO, PVdF, polyvinylidene fluoride-hexafluoropropylene copolymer (PVdF-HFP), PAN, PMA, and PMMA. Moreover, as a plasticizer, it is possible to use the electrolyte solution normally used for a lithium ion battery.

  In addition, even when an all-solid electrolyte layer is used as the electrolyte, the electrolyte does not flow and the electrolyte does not flow out to the current collector.

  The gel polymer electrolyte is produced by adding an electrolyte solution usually used in a lithium ion battery to an all solid polymer electrolyte such as PEO or PPO. It may be produced by holding an electrolytic solution in a polymer skeleton having no lithium ion conductivity, such as PVdF, PAN, or PMMA. The ratio of the polymer constituting the gel polymer electrolyte to the electrolytic solution is not particularly limited. If 100% of the polymer is an all solid polymer electrolyte and 100% of the electrolytic solution is a liquid electrolyte, all of the intermediates are the concept of a gel polymer electrolyte. include. The all solid electrolyte includes all electrolytes having Li ion conductivity such as polymer or inorganic solid.

The electrolyte layer preferably contains a supporting salt in order to ensure ionic conductivity. When the battery is a lithium secondary battery, LiBF ₄ , LiPF ₆ , LiN (SO ₂ CF ₃ ) ₂ , LiN (SO ₂ C ₂ F ₅ ) ₂ , or a mixture thereof is used as the supporting salt. it can. However, it is not necessarily limited to these. As described above, polyalkylene oxide polymers such as PEO and PPO often dissolve lithium salts such as LiBF ₄ , LiPF ₆ , LiN (SO ₂ CF ₃ ) ₂ , and LiN (SO ₂ C ₂ F ₅ ) _2. Yes. Moreover, excellent mechanical strength is exhibited by forming a crosslinked structure.

  The semiconductor unit 80 is not particularly limited as long as it is a material that can be applied by inkjet. For example, the semiconductor portion is formed using ink containing an organic semiconductor. As organic semiconductors, acene molecular materials such as naphthalene, anthracene, tetracene, pentacene, hexacene and derivatives thereof; pigments such as phthalocyanine compounds, azo compounds, perylene compounds and derivatives thereof; hydrazone compounds, triphenylmethane compounds , Diphenylmethane compounds, stilbene compounds, aryl vinyl compounds, pyrazoline compounds, triphenylamine compounds, triarylamine compounds, low molecular weight compounds such as derivatives thereof; poly-N-vinylcarbazole, halogenated poly-N-vinylcarbazole, polyvinyl High molecular compounds such as pyrene, polyvinylanthracene, pyrene formaldehyde resin, ethylcarbazole formaldehyde resin, and derivatives thereof; fluorenone, diphenoquinone, benzox Emissions, anthraquinone, indenone-based, polythiophene-based, and, like polyphenylene vinylene-based compounds.

  The semiconductor signal line 90 is used to control the conductivity of the semiconductor unit 80. Although the material which comprises a semiconductor signal wire is not specifically limited, The material similar to the conductor part 20 may be used. In order to control the conductivity of the semiconductor unit 80 by the semiconductor signal lines 90 and 95, for example, a method of applying a voltage of 5 volts to the semiconductor and turning on the semiconductor switch is used.

  The assembled battery of the present invention may be further arranged in series, parallel, or a combination of series and parallel to constitute a composite assembled battery. “Composite assembled battery” means a battery in which two or more assembled battery modules are electrically combined. Capacitance and voltage can be adjusted to a desired range by paralleling in series.

  FIG. 11 shows a composite assembled battery in which the assembled battery 100 of the present invention is arranged in 2 series-2 parallel. The assembled battery 100 is electrically connected by a conductor 110. The type and shape of the substrate and conductor on which the assembled battery is disposed are not particularly limited, and may be appropriately selected from known materials. Of course, newly developed materials may be diverted.

  FIG. 12 shows a composite assembled battery in which the assembled batteries 105 formed with the semiconductor portion 80 shown in FIGS. 8 to 10 are arranged in series. In this case, it is preferable that the semiconductor signal line 90 is formed on the substrate of the composite battery pack so that the electrical connection of the battery pack 105 can be controlled. By controlling the assembled battery 105 through the semiconductor signal line 90, an appropriate composite assembled battery can be selected from among the serial composite assembled batteries and the parallel composite assembled batteries.

  In the composite battery pack, a semiconductor for controlling the series and parallel of the battery packs may be formed on a conductor that electrically connects the battery packs. FIG. 13 shows a composite assembled battery in which a semiconductor 120 and a semiconductor 125 are formed on a conductor 110 that electrically connects the assembled battery 100. When the semiconductor 120 has a property as an insulating part and the semiconductor 125 has a property as a conductor, the assembled battery 100 is connected in series. When the semiconductor 120 has a property as a conductor and the semiconductor 125 has a property as an insulating portion, the assembled battery 100 is connected in parallel. That is, it is possible to switch between the series and the parallel of the assembled battery by controlling the semiconductor 120 through the semiconductor signal line 90 and controlling the semiconductor 125 through the semiconductor signal line 95.

  The constituent materials of the semiconductor 120 and the semiconductor 125 are not particularly limited as long as the conductor and the insulating portion can be controlled. In addition to the organic semiconductor exemplified for the semiconductor unit 80, various semiconductor materials made of an inorganic compound can be used.

  FIG. 14 shows a composite assembled battery that employs a method of turning on the semiconductor 120 and the semiconductor 125 by using a phototransistor for the semiconductor 120 and the semiconductor 125 and turning on the organic EL. The organic EL 130 and the organic EL 135 are turned on by supplying power to the organic EL power lines (140, 145). When the organic EL 130 and the organic EL 135 are lit, the semiconductor 120 and the semiconductor 125 have a property as a conductor. When the semiconductor 120 has a property as a conductor and the semiconductor 125 has a property as an insulating portion, the assembled battery 100 is connected in parallel. That is, the composite battery pack is switched between series and parallel by controlling the semiconductor 120 through the organic EL power line 140 and controlling the semiconductor 125 through the organic EL power line 145.

  The assembled battery or the composite assembled battery can be preferably used as a power source for driving a vehicle or a power source for auxiliary equipment. Since the assembled battery or the composite assembled battery of the present invention can freely change the battery voltage, the degree of freedom of application to a vehicle increases. However, the use is not limited to automobiles, and for example, it can be applied to trains.

  Then, the manufacturing method of the assembled battery of this invention is demonstrated. In manufacturing the assembled battery of the present invention, the battery is formed using an ink jet method, and the conductor portion that electrically connects the battery is formed using the ink jet method. “Forming using an ink jet method” means that the ink jet method is employed in at least a part of the formation process, and does not mean that all the components are manufactured using the ink jet method. . However, from the viewpoint of simplifying the manufacturing process, it is preferable that there are many processes using an ink jet system. Preferably, at least the positive electrode, the negative electrode, and the conductor portion are formed by an ink jet method. That is, preferably, a step of ejecting positive electrode ink containing a positive electrode active material by an ink jet method to form a positive electrode, a step of ejecting negative electrode ink containing a negative electrode active material by an ink jet method to form a negative electrode, and conductive particles The assembled battery is manufactured by a manufacturing method including a step of ejecting a conductive ink containing the ink by an ink jet method to form a conductor portion existing between the positive electrode and the negative electrode.

  The ink jet method means a printing method in which liquid ink is ejected from a nozzle and ink is attached to an object. The ink jet method is classified into a piezo method, a thermal ink jet method, and a bubble jet (registered trademark) method according to a method of ejecting ink.

  The piezo method is a method in which ink is ejected from nozzles by deformation of a piezo element that is arranged at the bottom of an ink chamber that stores ink and deforms when an electric current flows. The thermal ink jet method is a method in which ink is heated by a heat-generating heater, and the ink is ejected with the energy of steam explosion when the ink is vaporized. The bubble jet (registered trademark) method is a method in which ink is ejected by the energy of steam explosion when the ink is vaporized, similarly to the thermal ink jet method. The thermal ink jet method and the bubble jet (registered trademark) method are different in the portion to be heated, but the basic principle is the same.

  When a current collector is manufactured using an inkjet method, a thin and uniform current collector can be efficiently manufactured.

  By using the inkjet method, the formed layer can be made uniform and thin, and the characteristics and energy density of the battery can be improved. In addition, since a special process for electrically connecting the batteries can be omitted, the efficiency of battery assembly production is improved.

  When producing using the inkjet method, prepare inks for forming each component, such as current collector ink, positive electrode ink, negative electrode ink, electrolyte ink, conductor ink, semiconductor ink, and insulating part ink. Ink is ejected using an ink jet apparatus.

  Examples of components contained in the current collector ink include conductive particles, a binder, and a solvent. Since specific examples of the conductive particles and the binder are as described above, description thereof is omitted here.

  Examples of components contained in the positive electrode ink include a positive electrode active material, a binder, a conductive additive, and a solvent. The positive ink may be one kind or plural kinds. As the positive electrode active material and the conductive additive, the above-described compounds can be used. As the binder, polyethylene (PE), polypropylene (PP), polytetrafluoroethylene (PTFE), styrene butadiene rubber (SBR), polyacrylonitrile (PAN), polymethyl acrylate (PMA), polymethyl methacrylate (PMMA), poly Vinyl chloride (PVC), polyvinylidene fluoride (PVdF), or a mixture thereof. In order to prevent aggregation of the positive electrode active material and the conductive additive, a dispersant may be used. As the dispersant, a compound having a dispersing action such as polyoxystearylamine can be used.

  As a component contained in negative electrode ink, a negative electrode active material, a binder, a conductive support agent, and a solvent are mentioned. The negative electrode ink may be one type or a plurality of types. As the positive electrode active material and the conductive additive, the above-described compounds can be used. As the binder, the same binder as that used in the positive electrode ink can be used.

  Examples of the components contained in the electrolyte ink used for producing the electrolyte layer include an electrolyte or a raw material thereof and a solvent. The electrolyte ink contains at least an electrolyte or a raw material thereof. In the case of adopting a production method in which raw materials are polymerized after application by an ink jet method, the viscosity of the ink can be kept low, and clogging in the ink jet apparatus can be prevented.

  Examples of components contained in the conductive ink include conductive particles, a binder, and a solvent. Since specific examples of the conductive particles and the binder are as described above, description thereof is omitted here.

  Examples of components contained in the semiconductor ink include a semiconductor compound and a solvent. What is necessary is just to select a semiconductor compound according to the site | part formed. For example, in the case of forming the semiconductor portion 80, an organic semiconductor that is easily applied by inkjet is preferably used. Since specific examples of the organic semiconductor are as described above, description thereof is omitted here.

  Examples of the component contained in the insulating ink include a compound having no conductivity and a solvent. Since specific examples of the compound having no conductivity are as described above, the description thereof is omitted here.

  The solvent of each ink is not particularly limited, and examples thereof include N-methylpyrrolidone (NMP), dimethyl carbonate (DMC), and acetonitrile. The viscosity of the ink can be controlled by increasing or decreasing the amount of the solvent.

  The compounding ratio of the components contained in each ink is not particularly limited. However, the viscosity of the ink is preferably low enough to apply the inkjet method. On the other hand, from the viewpoint of improving working efficiency, the concentration of the contained component is preferably as high as possible. Examples of a method for keeping the viscosity low include a method for increasing the temperature of the ink. You may improve the compound contained so that a viscosity may become low. The viscosity of each ink supplied to the inkjet apparatus is not particularly limited, but is preferably about 1 to 100 cP.

  When each ink is prepared, the ink is ejected by an ink jet method to form a current collector, an electrode, and an electrolyte layer. The amount of ink ejected from the nozzles of the ink jet apparatus is very small, and an approximately equal volume can be ejected. Therefore, the electrode and the electrolyte layer formed by the adhesion of the electrode ink are very thin and uniform. Moreover, if an inkjet system is used, the thickness and shape of a collector, an electrode, and an electrolyte layer can be precisely controlled.

  The ink ejection mechanism employed by the ink jet apparatus may be any of a piezo method, a thermal ink jet method, and a bubble jet (registered trademark) method. The shape of the layer to be formed may be determined in advance. If a layer is formed on the basis of an image created on a computer, workability is excellent. The shape determination and production of a layer using a computer can be performed in the same manner as an image creation and printout operation using a computer and a printer, which are generally known. Therefore, it can be said that the present invention is relatively easy to realize industrial production in that the knowledge developed in this field can be used. When applying to a thin material such as metal foil, it is difficult to supply the thin material directly to the printer. Therefore, these materials are pasted on a mount such as A4 quality paper, supplied to the printer, and printed. Good.

  As the ink jet device, a device for manufacturing a battery may be manufactured, or a commercially available printer may be modified and used. For example, in order to prevent the problem that the plastic parts in the ink introduction part of the inkjet printer are dissolved by the solvent of the ink, replace the parts in the ink introduction part with metal parts, and apply the ink directly from the ink reservoir to the metal parts. Supply. Further, in order to prevent the active material in the ink from precipitating, the ink reservoir may always be stirred using a rotary blade.

  The volume of particles ejected from the inkjet device is preferably in the range of 1 to 100 picoliters. If the volume of the ejected particles is too small, vibration reduction may be insufficient. On the other hand, even if the volume of ejected particles is too large, there is a risk that vibration reduction will be insufficient. The volume of the particles ejected using the ink jet apparatus is substantially the same, and the manufactured electrodes and batteries are very uniform.

  The number of ejections by the ink jet method may be determined according to the thickness of the current collector, the electrode and the electrolyte layer, and the ratio of the constituent materials. If the thickness is insufficient in one printing, the printing may be repeated twice or more on the same surface. That is, the same ink is printed on the same base material. Thereby, a current collector, an electrode, and an electrolyte layer having a desired thickness are formed. When each layer is formed by the ink jet method, the uniformity of each layer formed is very high, and thus high uniformity can be maintained even when the layers are stacked many times.

  There are no particular limitations on the procedure for applying the ink when all of the current collector, positive electrode, electrolyte layer, and negative electrode are produced by the inkjet method. All layers may be produced using a single ink jet device, or a positive electrode ink jet device, an electrolyte layer ink jet device, and a negative electrode ink jet device are prepared, and a battery is manufactured by a flow operation. May be.

  After the electrodes are formed, the solvent is removed by drying. When the electrolyte raw material is polymerized by this stage and does not become an electrolyte, the polymerization reaction may be advanced. For example, when a photopolymerization initiator is contained in the ink, the polymerization reaction of the raw material may be advanced by irradiating predetermined light.

  Hereinafter, an embodiment of a method for manufacturing the assembled battery of FIGS. However, the production method of the present invention is not limited to this embodiment.

  First, the base 10 that is an insulating portion is supplied to an ink jet printer, and the prepared conductor ink, current collector ink, and insulating ink are applied to the base 10. Application by the ink jet method is repeated until a predetermined thickness is reached. Thereby, the conductor part 20, the insulating part 30, and the current collector 40 are formed. As the application pattern, a method in which an application pattern is prepared on a computer and each ink is applied based on the application pattern can be adopted as is done with a normal printer.

  The positive electrode ink, the negative electrode ink, the insulating portion ink, and the conductor portion ink are applied by an inkjet method until a predetermined thickness is reached. Thereby, the substrate 10 side of the electrolyte layer 60 in FIG. 3 is formed. The electrolyte ink is applied by an ink jet method until a predetermined thickness is reached. Thereby, the electrolyte layer 60 is formed. The positive electrode ink, the negative electrode ink, the insulating portion ink, and the conductor portion ink are applied by an inkjet method until a predetermined thickness is reached. Finally, the conductor portion ink, the current collector ink, and the insulating portion ink are applied by an inkjet method until a predetermined thickness is reached.

  The assembled battery shown in FIGS. 1 to 3 can be manufactured by application using such an ink jet method. Moreover, the assembled battery shown in FIGS. 5-6 can be produced by changing an application pattern.

It is a top view of one embodiment of the assembled battery of the present invention. It is a bottom view of the assembled battery of FIG. FIG. 3 is a schematic cross-sectional view taken along the “III-III” plane of the battery of FIGS. 1 and 2. It is a figure which shows the connection of the assembled battery of 2 parallel-2 series. It is a top view of other embodiments of the assembled battery of the present invention. It is a bottom view of the assembled battery of FIG. It is a figure which shows the connection of 4 series assembled batteries. It is a top view of one embodiment of the assembled battery of the present invention. It is a bottom view of the assembled battery of FIG. FIG. 10 is a schematic cross-sectional view of the battery of FIGS. 8 and 9 on the “XX” plane. The assembled battery 100 is a composite assembled battery arranged in 2 series-2 parallel. This is a composite assembled battery in which the assembled batteries 105 are arranged in series. This is a composite assembled battery in which a semiconductor 120 is formed on a conductor 110 that electrically connects the assembled battery 100. This is a composite assembled battery that employs a method of turning on the semiconductor 120 and the semiconductor 125 by using a phototransistor for the semiconductor 120 and the semiconductor 125 and turning on the organic EL.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Board | substrate, 20 ... Conductor part, 30 ... Insulating part, 40 ... Current collector, 50 ... Positive electrode, 60 ... Electrolyte layer, 70 ... Negative electrode, 80 ... Semiconductor part, 90 ... Semiconductor signal line, 95 ... Semiconductor signal line, DESCRIPTION OF SYMBOLS 100 ... Assembly battery, 105 ... Assembly battery, 110 ... Conductor, 120 ... Semiconductor, 125 ... Semiconductor, 130 ... Organic EL, 135 ... Organic EL, 140 ... Organic EL power supply wiring, 145 ... Organic EL power supply wiring

Claims (5)

Two or more batteries formed on a substrate using an inkjet method;
A semiconductor part formed using an ink jet method, capable of electrically connecting the battery , and having a property as a conductor capable of controlling a conductor and an insulating part by external control ;
An assembled battery having   The assembled battery according to claim 1, further comprising a semiconductor signal line connected to the semiconductor portion and capable of controlling a conductor and an insulating portion of the semiconductor portion.   The composite assembled battery which combined the assembled battery of Claim 1 or 2 in series, parallel, or series and parallel.   The composite assembled battery according to claim 3, wherein a semiconductor for controlling series and parallel of the assembled batteries is formed on a conductor that electrically connects the assembled batteries. A step of ejecting a positive electrode ink containing a positive electrode active material by an ink jet method to form a positive electrode;
A step of forming a negative electrode by ejecting a negative electrode ink containing a negative electrode active material by an inkjet method;
A semiconductor ink containing an organic semiconductor is ejected by an ink jet method to form a semiconductor portion that exists between the positive electrode and the negative electrode and that can control the conductor and the insulating portion by external control and has properties as a conductor. Stages,
A method for producing an assembled battery, comprising:

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