WO2016059693A1 - Electrode sheet production device and production method - Google Patents

Electrode sheet production device and production method Download PDF

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Publication number
WO2016059693A1
WO2016059693A1 PCT/JP2014/077508 JP2014077508W WO2016059693A1 WO 2016059693 A1 WO2016059693 A1 WO 2016059693A1 JP 2014077508 W JP2014077508 W JP 2014077508W WO 2016059693 A1 WO2016059693 A1 WO 2016059693A1
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WIPO (PCT)
Prior art keywords
separator
electrode sheet
current collector
core
attaching
Prior art date
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PCT/JP2014/077508
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French (fr)
Japanese (ja)
Inventor
敦 渡邉
Original Assignee
東レエンジニアリング株式会社
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Priority to PCT/JP2014/077508 priority Critical patent/WO2016059693A1/en
Publication of WO2016059693A1 publication Critical patent/WO2016059693A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/139—Processes of manufacture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention relates to an electrode sheet manufacturing apparatus and method used for a lithium ion secondary battery or the like.
  • a conventional lithium ion battery manufacturing apparatus and manufacturing method employ the following procedure. 1) A positive electrode-side electrode sheet is produced by applying and drying a positive electrode active material on both surfaces of an Al foil or the like as a base material. 2) Using a Cu foil or the like as a base material, a negative electrode active material is applied and dried on both surfaces thereof to produce a negative electrode sheet. 3) Press work is performed to increase the density of the active material applied to the positive electrode / negative electrode sheet. 4) The positive electrode and negative electrode sheets are cut into predetermined dimensions or punched. 5) A positive electrode and a negative electrode material are alternately laminated on a long separator sheet, or are folded in a Z shape (for example, Patent Document 1). Or it may laminate
  • PP polypropylene
  • PE polyethylene
  • separators other than the above a separator using a nonwoven fabric made of organic fibers (PP, PET, etc.) having a predetermined fiber diameter has been proposed. And this separator is bonded together to what bonded various mixtures to the battery electrode sheet, and was hardened by hot press (for example, patent documents 2).
  • Patent Document 3 In order to increase the capacity and charge density, attempts have been made to increase the thickness of the positive electrode side active material layer or increase the density (for example, Patent Document 3).
  • an object of this invention is to provide the manufacturing apparatus and manufacturing method of an electrode sheet which can be dried in a short time, suppressing the surface drying of an active material, even if the film thickness of an active material is thickened.
  • the first invention provides: A sheet conveying section for conveying the core material of the electrode sheet; An application portion for applying a current collector material to the surface of the core material of the electrode sheet; A separator supply section for supplying a separator material; A separator attaching portion for attaching the separator material to the electrode sheet coated with the current collector material from above the undried current collector material; An electrode sheet manufacturing apparatus including a drying unit that dries the current collector material.
  • the application part is A first application part for applying a current collector material to the surface side of the core material of the electrode sheet;
  • the separator supply unit includes a first separator supply unit and a second separator supply unit,
  • the separator attaching part is A first separator affixing unit that affixes the separator material supplied from the first separator supply unit from above the current collector material applied by the first application unit; And a second separator attaching part for attaching the separator material supplied from the second separator supplying part onto the current collector material applied by the second applying part.
  • the separator material is composed of a material containing cellulose fibers on at least the surface of the electrode sheet on the core material side.
  • the separator material includes a cellulose fiber layer and a porous resin layer.
  • the fifth invention is: A core material supplying step for supplying the core material of the electrode sheet; An application step of applying a current collector material to the surface of the core of the electrode sheet; A separator supplying step for supplying a separator material; A separator attaching step of attaching the separator material to the core of the electrode sheet from above the undried current collector material; A drying step of drying the current collector material,
  • a core material supplying step for supplying the core material of the electrode sheet An application step of applying a current collector material to the surface of the core of the electrode sheet
  • a separator supplying step for supplying supplying a separator material
  • a separator attaching step of attaching the separator material to the core of the electrode sheet from above the undried current collector material A drying step of drying the current collector material
  • the coating process includes A first application step of applying a current collector material to the surface side of the core material of the electrode sheet; A second application step of applying a current collector material to the back side of the core material of the electrode sheet,
  • the separator supply step includes a first separator supply step and a second separator supply step,
  • the separator attaching step is A first separator attaching step for attaching the separator material supplied from the first separator supplying step on the current collector material applied in the first applying step; And a second separator attaching step of attaching the separator material supplied from the second separator supplying step onto the current collector material applied in the second applying step.
  • the seventh invention is the fifth invention or the sixth invention,
  • the separator material is composed of a material containing cellulose fibers on at least the surface of the electrode sheet on the core material side.
  • the separator material includes a cellulose fiber layer and a porous resin layer.
  • the electrode sheet produced by applying the present invention has both surfaces sandwiched between separators even when the temperature is high, so that the solvent component on the surface side is excessively volatilized even when exposed to a high temperature in a drying furnace. It is possible to prevent the occurrence of cracks due to the surface of the coated product being dried. Therefore, even if the thickness of the active material to be applied is increased, drying can be performed in a short time while suppressing the surface drying of the active material.
  • the separator since the separator has high heat resistance, it does not shrink or clog even if it passes through the drying furnace, and good ion conversion is performed, so that good charge / discharge characteristics can be obtained.
  • FIG. 1 is a side view showing an example of a form embodying the present invention.
  • the three axes of the orthogonal coordinate system are X, Y, and Z
  • the XY plane is the horizontal plane
  • the Z direction is the vertical direction.
  • the direction of the arrow is expressed as the downstream side in the conveyance direction
  • the opposite direction is expressed as the upstream side in the conveyance direction.
  • the Y direction is expressed as the width direction.
  • the electrode sheet manufacturing apparatus 1 includes a sheet conveyance unit 2, a coating unit 3, a separator supply unit 4, a separator pasting unit 5, and a drying unit 6.
  • the sheet conveying unit 2 conveys the core material 10c of the electrode sheet. Specifically, the sheet conveying unit 2 includes an electrode sheet unwinding device 21 and an electrode sheet winding device 22.
  • the electrode sheet unwinding device 21 supplies the electrode sheet core material 10c wound around the reel 21r while unwinding.
  • the electrode sheet take-up device 22 collects the electrode sheet 10 that has undergone the following steps while winding the reel 22r.
  • the application part 3, the separator supply part 4, the separator sticking part 5, the drying part 6, etc. which are described in detail below are arranged between the electrode sheet unwinding device 21 and the electrode sheet winding device 22. .
  • a roller conveyor 23 may be disposed between the electrode sheet unwinding device 21 and the electrode sheet winding device 22 as necessary.
  • the roller conveyor 23 supports the electrode sheet core 10c or the electrode sheet 10 and promotes its conveyance.
  • the roller conveyor 23 can be configured by using roller conveyors 23a to 23c and the like that are arranged at a predetermined interval as appropriate.
  • a configuration may be adopted in which a rotation driving motor 23m is connected to any one or each of the roller conveyors 23a to 23c. In this case, the rotational drive motor 23m is configured to rotate at a predetermined rotational speed in a predetermined direction so that the roller conveyor is synchronized with the transport direction and transport speed of the electrode sheet core 10c or the electrode sheet 10. Keep it.
  • the sheet supply unit 2 can convey the core material of the electrode sheet at a predetermined speed in the direction indicated by the arrow 10v.
  • the application unit 3 applies a current collector material to the surface of the core material of the electrode sheet.
  • the coating unit 3 includes a coating nozzle 31, a coating liquid supply pump 32, and a backup roller 33.
  • the coating nozzle 31 is configured by a so-called slit die having a slit-like opening at the tip 31h, and the tip 31h is arranged toward the surface of the core material 10c of the electrode sheet to be conveyed. Yes.
  • the coating liquid supply pump 32 supplies the coating nozzle 31 in synchronism with the conveyance of the electrode sheet core 10c.
  • the coating liquid supply pump 32 can be configured using a syringe pump, a gear pump, or the like.
  • the backup roller 33 prevents the position in the thickness direction and the width direction of the core material 10c of the electrode sheet being conveyed from changing.
  • the coating nozzle 31 and the backup roller 33 are arranged in parallel with a predetermined interval therebetween, and are arranged so that the electrode sheet core 10c passes between the coating nozzle 31 and the backup roller 33. Yes.
  • the application unit 3 may be configured to include an auxiliary transport device 34 as necessary.
  • the auxiliary conveying device 34 is configured to support a portion where the current collector material is not applied, such as both ends of the core member 10c of the electrode sheet.
  • the application unit 3 can apply the current collector material to the surface of the core material 10c of the electrode sheet with a predetermined thickness while conveying the core material 10c of the electrode sheet.
  • the separator supply unit 4 supplies the separator material 11. Specifically, the separator supply unit 4 includes a separator unwinding device 40.
  • the separator unwinding device 40 supplies the separator material 11 wound in a roll shape while unwinding in synchronization with the conveyance of the electrode sheet 10e coated with the current collector material.
  • the separator supply unit 4 may further include a spray nozzle 43a.
  • the spray nozzle 43 a is for applying a binder for enhancing the adhesion between the electrode sheet 10 e to which the current collector material is applied and the separator material 11.
  • the spray nozzle 43a may have a form in which the binder is applied on the electrode sheet 10e side on which the current collector material is applied, in addition to the form in which the binder is applied on the separator material 11 side as shown in FIG.
  • the separator attaching part 5 attaches the separator material 11 to the electrode sheet 10e coated with the current collector material from above the undried current collector material.
  • the separator attaching part 5 is configured by using a pair of press rollers 51 and 52.
  • the press roller 51 is disposed on the upper surface side of the electrode sheet 10e coated with the current collector material
  • the press roller 52 is disposed on the upper surface side of the electrode sheet 10e coated with the current collector material.
  • the press rollers 51 and 52 are both cylindrical rollers longer than the width of the electrode sheet 10e coated with the current collector material, and are arranged in parallel with a predetermined gap between each other. Yes.
  • the gap between the press rollers 51 and 52 is set to be equal to or narrower than the total thickness of the electrode sheet 10e coated with the current collector material and the separator material 11. And it passes between these press rollers 51 and 52 in the state which piled up the electrode sheet 10e with which the collector material was apply
  • the separator attaching part 5 can attach the separator material 11 to the electrode sheet 10e coated with the current collector material from above the undried current collector material.
  • the drying unit 6 is for drying the current collector material.
  • the drying unit 6 can be configured by using a drying device 60 in which the temperature in the passage is increased while passing the electrode sheet on which the current collector material is applied and the separator is attached.
  • the drying device 60 includes an infrared heater 61, a hot air fan 62, a microwave heating device 63, and the like attached to the upper surface side and lower surface side of the conveyed electrode sheet.
  • the electrode sheet manufacturing apparatus 1 Since the electrode sheet manufacturing apparatus 1 has the above-described configuration, the electrode sheet manufactured using the apparatus is coated on the surface of the electrode sheet even if it is exposed to a high temperature in a drying furnace. It is possible to prevent the solvent component on the surface side (that is, the outside) of the product from excessively volatilizing. As a result, the occurrence of cracks due to the dried surface of the coated product is suppressed. Therefore, even if the thickness of the active material to be applied is increased, drying can be performed in a short time while suppressing the surface drying of the active material.
  • the solvent line tends to ooze out.
  • the inside of the separator that is, the coated material side
  • the outside of the separator is in an atmosphere dried at a high temperature, so that the solvent component can be rapidly dried while preventing cracks.
  • the present invention can be embodied by selecting a general porous material or a breathable material as the separator material.
  • the electrode sheet manufacturing apparatus 1 may further include a sheet press unit 7.
  • the sheet press unit 7 is disposed between the drying unit 6 and the electrode sheet take-up device 22, and compresses the electrode sheet 10f after the current collector material is dried after attaching the separator in the thickness direction.
  • the sheet press unit 7 can be configured using an upper surface side pressure roller 71 and a lower surface side pressure roller 72 which are arranged in parallel with a predetermined gap.
  • the gap between the upper pressure roller 71 and the lower pressure roller 72 is set to be narrower than the thickness of the electrode sheet 10f after the current collector material is dried after the separator is attached.
  • the upper surface side pressure roller 71 and the lower surface side pressure roller 72 are configured to rotate in the directions of arrows 71v and 72v, respectively. Then, the electrode sheet 10 f is passed between the upper surface side pressure roller 71 and the lower surface side pressure roller 72.
  • the sheet press unit 7 can compress the electrode sheet 10f after the current collector material is dried after the separator is pasted in the thickness direction.
  • the electrode sheet manufacturing apparatus 1 may be configured to include a tab cut portion 8.
  • the tab cut portion 8 is disposed between the drying portion 6 and the electrode sheet take-up device 22, and the core material portion of the electrode sheet 10f after the current collector material is dried after the separator is pasted is not applied.
  • the core material part to which other current collector material is not applied is removed while leaving a part of the material.
  • the tab cut portion 8 can be configured to include a cylindrical housing called a rotary cutter provided with a cutting blade and a backup roller.
  • the rotary cutter and the backup roller rotate so as to interpose the electrode sheet with each other, and are configured so that the core material portion to which the current collector material is not applied can be cut into a predetermined shape.
  • the tab cut portion 8 can remove the core portion of the electrode sheet 10f to which the current collector material is not applied.
  • Both the sheet press part 7 and the tab cut part 8 can also be used.
  • the sheet press part 7 is arranged on the upstream side of the tab cut part 8
  • the present invention is not limited to the form in which the current collector material is applied to one side (the upper surface side shown in FIG. 1) of the core material 10c of the electrode sheet as described above.
  • the manufacturing apparatus 1b may be used. That is, the electrode sheet manufacturing apparatus 1b is configured to apply the current collector material on both surfaces (the upper surface side and the lower surface side shown in FIG. 2) of the electrode sheet core 10c and paste the separator materials 11 and 11b. Yes.
  • FIG. 2 is a side view showing another example of a form embodying the present invention.
  • the electrode sheet manufacturing apparatus 1b includes a sheet conveyance unit 2, an application unit 3b, a separator supply unit 4b, a separator pasting unit 5, and a drying unit 6.
  • the sheet conveying section 2, the separator attaching section 5, and the drying section 6 have the same configuration as those in the above-described electrode sheet manufacturing apparatus 1.
  • the coating unit 3b has a configuration in which a coating nozzle 36 and a coating liquid supply pump 37 are further provided in the configuration of the coating unit 3 of the electrode sheet manufacturing apparatus 1 described above.
  • the coating nozzle 37 is formed of a so-called slit die having a slit-like opening at the tip 36h, similar to the coating nozzle 31 described above, and the tip 36h is the core material of the electrode sheet to be conveyed. It is arranged toward the back surface (that is, the lower surface side) of 10c.
  • the coating liquid supply pump 37 is supplied to the coating nozzle 36 in synchronism with the conveyance of the core material 10c of the electrode sheet, like the coating liquid supply pump 32 described above.
  • the coating liquid supply pump 37 can be configured using a syringe pump, a gear pump, or the like.
  • the separator supply unit 4b has a configuration in which the separator supply unit 4 of the electrode sheet manufacturing apparatus 1 described above is further provided with a separator unwinding device 40b.
  • the separator unwinding device 40b supplies the separator material 11b wound in a roll shape while unwinding in synchronization with the conveyance of the electrode sheet 10e coated with the current collector material. Is.
  • the separator supply unit 4b may further include a spray nozzle 43b.
  • the spray nozzle 43b is for applying a binder for improving the adhesion between the electrode sheet 10e to which the current collector material is applied and the separator material 11b, like the spray nozzle 43 described above.
  • the spray nozzle 43b may be applied to the electrode sheet 10e side applied with the current collector material, in addition to the form in which the binder is applied to the separator material 11b side as shown in FIG.
  • the gap in the thickness direction between the rollers disposed in a pair on the upper surface side and the lower surface side in the separator pasting portion 5, the sheet press portion 7, and the tab cut portion 8 is appropriately determined by the thickness of the current collector material or the separator material. It adjusts suitably corresponding to that the thickness of 11b increased.
  • the current collector material is applied to both surfaces (the upper surface side and the lower surface side shown in FIG. 2) of the core material 10c of the electrode sheet, and the separator material 11 , 11b can be pasted.
  • Electrode sheet manufacturing process Although the electrode sheet manufacturing apparatus according to the present invention has been described above, the present invention can also be applied to a method for manufacturing an electrode sheet. That is, an electrode sheet can be manufactured by the procedure shown below.
  • FIG. 3 is a flowchart showing an example of a form embodying the present invention.
  • FIG. 3 shows a series of flows for manufacturing the battery electrode sheet for each step.
  • the sheet conveying unit 2 sets the core material 10c of the battery electrode sheet (s11). Specifically, the reel 21 r around which the core material 10 c of the battery electrode sheet is wound is set in the electrode sheet unwinding device 21. And the core material 10c of the battery electrode sheet is pulled out from the electrode sheet unwinding device 21 and is spread over the application part 3, the separator attaching part 5, and the drying part 6. Then, the core material 10c of the battery electrode sheet is wound around the reel 22r of the electrode sheet winding device 22, The tension
  • the core material 10c of the battery electrode sheet is continuously conveyed to the downstream side (that is, the electrode sheet winding device 22 side) (s21).
  • the current collector material is applied to the surface of the core material 10c of the battery electrode sheet by the application unit 3 while continuously conveying the core material 10c of the battery electrode sheet downstream (s31).
  • the current collector material is applied to one surface side (for example, the upper surface side) in the case of single-sided application, and the current collector is also applied to the other surface side (for example, the lower surface side) in the case of double-sided application. Apply body material.
  • the electrode sheet 10e coated with the current collector material is unwound and supplied from the separator unwinding device 40 of the separator supply unit 4 in the separator attaching unit 5 installed on the downstream side of the applying unit 3 (s41). 11 is bonded together (s51).
  • the electrode sheet 10s to which the separator is attached is dried in the drying unit 6 because the current collector material is in an undried state after application (s61).
  • the electrode sheet 10d after the current collector material is dried is used as it is or after forming the current collector electrode part as necessary (s71) or being pressed (s81), and then winding the electrode sheet It is wound and collected on the reel 22r of the device 22.
  • the conveyance of the electrode sheet 10 is stopped (s91), and the electrode sheet is taken out from the conveyance unit (s92).
  • the separator material is preferably composed of a material containing cellulose fibers at least on the surface of the electrode sheet on the core material side.
  • the cellulose fiber has a higher heat-resistant temperature than a general resin material, it can be dried for a short time by high-temperature drying, and the process margin can be widened.
  • the separator material preferably includes cellulose fibers and a porous resin layer.
  • Electrode sheet manufacturing apparatus Sheet conveyance part 3 Application

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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Abstract

Provided are a production device and a production method allowing an active material to dry in a short time even when the thickness of the active material is thick, while limiting the drying of the surface of the active material. Specifically, the electrode sheet production device and production method comprise a core material supply step for supplying an electrode sheet core material, a coating step for coating the surface of the electrode sheet core material with a collector material, a separator supply step for supplying a separator material, a separator pasting step for pasting the separator material against the electrode sheet core material to cover the undried collector material, and a drying step for drying the collector material. Each of the steps proceeds in the following order: the coating step, the separator pasting step, and the drying step.

Description

電極シートの製造装置及び製造方法Electrode sheet manufacturing apparatus and manufacturing method
　本発明は、リチウムイオン二次電池等に用いられる、電極シートの製造装置及び製造方法に関するものである。 The present invention relates to an electrode sheet manufacturing apparatus and method used for a lithium ion secondary battery or the like.
　従来のリチウムイオン電池の製造装置・製造方法では、以下の手順を採用している。
１）Ａｌ箔などを基材とし、その両面に正極用活物質を塗布・乾燥させて、正極側電極シートを製造する。
２）Ｃｕ箔などを基材とし、その両面に負極用活物質を塗布・乾燥させて、負極側電極シートを製造する。
３）正極・負極側電極シートに塗布された活物質の密度を増すために、プレス加工する。
４）正極・負極側電極シートを、それぞれ所定の寸法に切断したり、打ち抜き加工する。
５）長尺のセパレータシート上に正極・負極材料を交互に積層したり、Ｚ状につづら折りしたりする（例えば、特許文献１）。あるいは、カットされた正極・負極シートに、カットされたセパレータを挿入しながら積層することもある。そして、この製造過程で用いられるセパレータとしては、ポリプロピレン（ＰＰ）やポリエチレン（ＰＥ）等からなるシート状フィルムが一般的である。 A conventional lithium ion battery manufacturing apparatus and manufacturing method employ the following procedure.
1) A positive electrode-side electrode sheet is produced by applying and drying a positive electrode active material on both surfaces of an Al foil or the like as a base material.
2) Using a Cu foil or the like as a base material, a negative electrode active material is applied and dried on both surfaces thereof to produce a negative electrode sheet.
3) Press work is performed to increase the density of the active material applied to the positive electrode / negative electrode sheet.
4) The positive electrode and negative electrode sheets are cut into predetermined dimensions or punched.
5) A positive electrode and a negative electrode material are alternately laminated on a long separator sheet, or are folded in a Z shape (for example, Patent Document 1). Or it may laminate | stack, inserting the cut separator into the cut positive electrode / negative electrode sheet. And as a separator used in this manufacturing process, the sheet-like film which consists of polypropylene (PP), polyethylene (PE), etc. is common.
　また、上記以外のセパレータの形態として、所定の繊維径である有機繊維（ＰＰ，ＰＥＴなど）からなる不織布を用いたものが提案されている。そして、このセパレータは、電池用電極シートに種々の混合物を結着させて熱プレスにより硬化させたものに、貼り合わせされる（例えば、特許文献２）。 Further, as separators other than the above, a separator using a nonwoven fabric made of organic fibers (PP, PET, etc.) having a predetermined fiber diameter has been proposed. And this separator is bonded together to what bonded various mixtures to the battery electrode sheet, and was hardened by hot press (for example, patent documents 2).
　さらに、高容量化や充電密度を向上させるため、正極側活物質層の厚さを厚くしたり高密度化することが試みられている（例えば、特許文献３）。 Furthermore, in order to increase the capacity and charge density, attempts have been made to increase the thickness of the positive electrode side active material layer or increase the density (for example, Patent Document 3).
特開平７－５７７１６号公報JP-A-7-57716 特開平１１－３２９３９３号公報JP 11-329393 A 特開２０１２－１４６５９０号公報JP 2012-146590 A
　しかし、活物質の膜厚を厚くすると、乾燥に時間がかかるため、乾燥ラインの全長が伸びてしまう。一方、従来と同じ搬送速度で塗布・乾燥を終えるような条件で急激に乾燥をさせると、活物質表面がひび割れしやすくなり、思うようにライン速度を上げられなかったり、プロセスマージンを広くできないなど、課題があった。 However, if the film thickness of the active material is increased, it takes time to dry, so that the entire length of the drying line is extended. On the other hand, if the coating material is dried at the same conveying speed as before, the active material surface will easily crack, and the line speed cannot be increased as expected and the process margin cannot be increased. There was a problem.
　そこで本発明は、活物質の膜厚を厚くしても、活物質の表面乾燥を抑えつつ、短時間で乾燥を行える、電極シートの製造装置及び製造方法を提供することを目的とする。
Then, an object of this invention is to provide the manufacturing apparatus and manufacturing method of an electrode sheet which can be dried in a short time, suppressing the surface drying of an active material, even if the film thickness of an active material is thickened.
　以上の課題を解決するために、第１の発明は、
　電極シートの芯材を搬送するシート搬送部と、
　前記電極シートの芯材の表面に集電体材料を塗布する塗布部と、
　セパレータ材料を供給するセパレータ供給部と、
　前記集電体材料が塗布された電極シートに未乾燥の集電体材料の上から前記セパレータ材料を貼り付けるセパレータ貼付部と、
　前記集電体材料を乾燥させる乾燥部とを備えた電極シートの製造装置である。 In order to solve the above problems, the first invention provides:
A sheet conveying section for conveying the core material of the electrode sheet;
An application portion for applying a current collector material to the surface of the core material of the electrode sheet;
A separator supply section for supplying a separator material;
A separator attaching portion for attaching the separator material to the electrode sheet coated with the current collector material from above the undried current collector material;
An electrode sheet manufacturing apparatus including a drying unit that dries the current collector material.
第２の発明は、第１の発明において、
　前記塗布部は、
前記電極シートの芯材の表面側に集電体材料を塗布する第１塗布部と、
当該電極シートの芯材の裏面側に集電体材料を塗布する第２塗布部とを備え、
　前記セパレータ供給部は、第１セパレータ供給部と、第２セパレータ供給部とを備え、
　前記セパレータ貼付部は、
前記第１セパレータ供給部から供給されたセパレータ材料を前記第１塗布部で塗布された集電体材料の上から貼り付ける第１セパレータ貼付部と、
前記第２セパレータ供給部から供給されたセパレータ材料を前記第２塗布部で塗布された集電体材料の上から貼り付ける第２セパレータ貼付部とを備えたことを特徴とする。 According to a second invention, in the first invention,
The application part is
A first application part for applying a current collector material to the surface side of the core material of the electrode sheet;
A second application part for applying a current collector material to the back side of the core material of the electrode sheet;
The separator supply unit includes a first separator supply unit and a second separator supply unit,
The separator attaching part is
A first separator affixing unit that affixes the separator material supplied from the first separator supply unit from above the current collector material applied by the first application unit;
And a second separator attaching part for attaching the separator material supplied from the second separator supplying part onto the current collector material applied by the second applying part.
第３の発明は、第１の発明又は第２の発明において、
　前記セパレータ材料は、少なくとも前記電極シートの芯材側の表面にセルロース繊維を含む材料で構成されていることを特徴とする。 According to a third invention, in the first invention or the second invention,
The separator material is composed of a material containing cellulose fibers on at least the surface of the electrode sheet on the core material side.
第４の発明は、第３の発明において、
　前記セパレータ材料は、セルロース繊維層と多孔質樹脂層とを備えていることを特徴とする。 According to a fourth invention, in the third invention,
The separator material includes a cellulose fiber layer and a porous resin layer.
第５の発明は、
　電極シートの芯材を供給する芯材供給工程と、
　前記電極シートの芯材の表面に集電体材料を塗布する塗布工程と、
　セパレータ材料を供給するセパレータ供給工程と、
　前記電極シートの芯材に対して未乾燥の集電体材料の上から前記セパレータ材料を貼り付けるセパレータ貼付工程と、
　前記集電体材料を乾燥させる乾燥工程とを有し、
塗布工程、セパレータ貼付工程、乾燥工程の順で各工程が進められる
電極シートの製造方法である。 The fifth invention is:
A core material supplying step for supplying the core material of the electrode sheet;
An application step of applying a current collector material to the surface of the core of the electrode sheet;
A separator supplying step for supplying a separator material;
A separator attaching step of attaching the separator material to the core of the electrode sheet from above the undried current collector material;
A drying step of drying the current collector material,
This is a method for manufacturing an electrode sheet in which each step proceeds in the order of a coating step, a separator attaching step, and a drying step.
第６の発明は、第５の発明において、
　前記塗布工程は、
前記電極シートの芯材の表面側に集電体材料を塗布する第１塗布工程と、
当該電極シートの芯材の裏面側に集電体材料を塗布する第２塗布工程とを有し、
　前記セパレータ供給工程は、第１セパレータ供給工程と、第２セパレータ供給工程とを有し、
　前記セパレータ貼付工程は、
前記第１セパレータ供給工程から供給されたセパレータ材料を前記第１塗布工程で塗布された集電体材料の上から貼り付ける第１セパレータ貼付工程と、
前記第２セパレータ供給工程から供給されたセパレータ材料を前記第２塗布工程で塗布された集電体材料の上から貼り付ける第２セパレータ貼付工程とを有したことを特徴とする。 According to a sixth invention, in the fifth invention,
The coating process includes
A first application step of applying a current collector material to the surface side of the core material of the electrode sheet;
A second application step of applying a current collector material to the back side of the core material of the electrode sheet,
The separator supply step includes a first separator supply step and a second separator supply step,
The separator attaching step is
A first separator attaching step for attaching the separator material supplied from the first separator supplying step on the current collector material applied in the first applying step;
And a second separator attaching step of attaching the separator material supplied from the second separator supplying step onto the current collector material applied in the second applying step.
第７の発明は、第５の発明又は第６の発明において、
　前記セパレータ材料は、少なくとも前記電極シートの芯材側の表面にセルロース繊維を含む材料で構成されていることを特徴とする。 The seventh invention is the fifth invention or the sixth invention,
The separator material is composed of a material containing cellulose fibers on at least the surface of the electrode sheet on the core material side.
第８の発明は、第７の発明において、
　前記セパレータ材料は、セルロース繊維層と多孔質樹脂層とを備えていることを特徴とする。 In an eighth aspect based on the seventh aspect,
The separator material includes a cellulose fiber layer and a porous resin layer.
　本発明を適用して製造される電極シートは、高温となってもセパレータで両面が挟まれているため、乾燥炉内で高温に曝されても表面側の溶剤成分が過剰に揮発するのを防ぐことができ、塗布物が表面乾燥したことによるひび割れの発生が抑制される。
従って、塗布する活物質の膜厚を厚くしても、活物質の表面乾燥を抑えつつ、短時間で乾燥を行える。 The electrode sheet produced by applying the present invention has both surfaces sandwiched between separators even when the temperature is high, so that the solvent component on the surface side is excessively volatilized even when exposed to a high temperature in a drying furnace. It is possible to prevent the occurrence of cracks due to the surface of the coated product being dried.
Therefore, even if the thickness of the active material to be applied is increased, drying can be performed in a short time while suppressing the surface drying of the active material.
　さらに、当該セパレータは、耐熱性が高いため、乾燥炉内を通過しても熱収縮したり目詰まりしたりせず、良好なイオン変換が行われるため、良好な充放電特性が得られる。
Furthermore, since the separator has high heat resistance, it does not shrink or clog even if it passes through the drying furnace, and good ion conversion is performed, so that good charge / discharge characteristics can be obtained.
本発明を具現化する形態の一例を示す側面図である。It is a side view which shows an example of the form which embodies this invention. 本発明を具現化する形態の別の一例を示す側面図である。It is a side view which shows another example of the form which embodies this invention. 本発明を具現化する形態の一例を示すフロー図である。It is a flowchart which shows an example of the form which embodies this invention.
　本発明を実施するための形態について、図を用いながら説明する。
図１は、本発明を具現化する形態の一例を示す側面図である。
以下各図においては、直交座標系の３軸をＸ、Ｙ、Ｚとし、ＸＹ平面を水平面、Ｚ方向を鉛直方向とする。特にＸ方向は矢印の方向を搬送方向下流側、その逆方向を搬送方向上流側と表現し、Ｚ方向は矢印の方向を上、その逆方向を下と表現する。また、Ｙ方向は幅方向と表現する。 DESCRIPTION OF EMBODIMENTS Embodiments for carrying out the present invention will be described with reference to the drawings.
FIG. 1 is a side view showing an example of a form embodying the present invention.
In the following drawings, the three axes of the orthogonal coordinate system are X, Y, and Z, the XY plane is the horizontal plane, and the Z direction is the vertical direction. In particular, in the X direction, the direction of the arrow is expressed as the downstream side in the conveyance direction, and the opposite direction is expressed as the upstream side in the conveyance direction. The Y direction is expressed as the width direction.
　電極シートの製造装置１は、シート搬送部２と、塗布部３と、セパレータ供給部４と、セパレータ貼付部５と、乾燥部６とを含んで構成されている。 The electrode sheet manufacturing apparatus 1 includes a sheet conveyance unit 2, a coating unit 3, a separator supply unit 4, a separator pasting unit 5, and a drying unit 6.
　シート搬送部２は、電極シートの芯材１０ｃを搬送するものである。
具体的には、シート搬送部２は、電極シート巻出装置２１と、電極シート巻取装置２２を備えて構成されている。 The sheet conveying unit 2 conveys the core material 10c of the electrode sheet.
Specifically, the sheet conveying unit 2 includes an electrode sheet unwinding device 21 and an electrode sheet winding device 22.
　電極シート巻出装置２１は、リール２１ｒに巻き付けられた電極シートの芯材１０ｃを巻き出しながら供給するものである。電極シート巻取装置２２は、下述の工程を経た後の電極シート１０をリール２２ｒ巻き取りながら回収するものである。なお、詳細を下述する、塗布部３、セパレータ供給部４、セパレータ貼付部５、乾燥部６などは、電極シート巻出装置２１と、電極シート巻取装置２２との間に配置されている。 The electrode sheet unwinding device 21 supplies the electrode sheet core material 10c wound around the reel 21r while unwinding. The electrode sheet take-up device 22 collects the electrode sheet 10 that has undergone the following steps while winding the reel 22r. In addition, the application part 3, the separator supply part 4, the separator sticking part 5, the drying part 6, etc. which are described in detail below are arranged between the electrode sheet unwinding device 21 and the electrode sheet winding device 22. .
　また、電極シート巻出装置２１と電極シート巻取装置２２との間には、必要に応じて、ローラコンベア２３を配置しても良い。ローラコンベア２３は、電極シートの芯材１０ｃないし電極シート１０を支えつつ、その搬送を促すものである。なお、ローラコンベア２３は、適宜所定の間隔で配置されたローラコンベア２３ａ～２３ｃなどを用いてで構成することができる。さらに、ローラコンベア２３ａ～２３ｃのいずれか、または各々に、回転駆動用モータ２３ｍが接続された構成としても良い。この場合、回転駆動用モータ２３ｍは、ローラコンベアが電極シートの芯材１０ｃないし電極シート１０の搬送方向及び搬送速度と同期するように、所定の方向に所定の回転数で回転するように構成しておく。 Further, a roller conveyor 23 may be disposed between the electrode sheet unwinding device 21 and the electrode sheet winding device 22 as necessary. The roller conveyor 23 supports the electrode sheet core 10c or the electrode sheet 10 and promotes its conveyance. The roller conveyor 23 can be configured by using roller conveyors 23a to 23c and the like that are arranged at a predetermined interval as appropriate. Furthermore, a configuration may be adopted in which a rotation driving motor 23m is connected to any one or each of the roller conveyors 23a to 23c. In this case, the rotational drive motor 23m is configured to rotate at a predetermined rotational speed in a predetermined direction so that the roller conveyor is synchronized with the transport direction and transport speed of the electrode sheet core 10c or the electrode sheet 10. Keep it.
　このような構成をしているため、シート供給部２は、電極シートの芯材を矢印１０ｖに示す方向に所定の速度で搬送することができる。 Because of such a configuration, the sheet supply unit 2 can convey the core material of the electrode sheet at a predetermined speed in the direction indicated by the arrow 10v.
　塗布部３は、電極シートの芯材の表面に集電体材料を塗布するものである。
具体的には、塗布部３は、塗布用ノズル３１と、塗液供給ポンプ３２と、バックアップローラ３３を備えて構成されている。 The application unit 3 applies a current collector material to the surface of the core material of the electrode sheet.
Specifically, the coating unit 3 includes a coating nozzle 31, a coating liquid supply pump 32, and a backup roller 33.
　塗布用ノズル３１は、先端部３１ｈにスリット状の開口部を備えた、いわゆるスリットダイで構成されており、先端部３１ｈが、搬送される電極シートの芯材１０ｃの表面に向けて配置されている。 The coating nozzle 31 is configured by a so-called slit die having a slit-like opening at the tip 31h, and the tip 31h is arranged toward the surface of the core material 10c of the electrode sheet to be conveyed. Yes.
　塗液供給ポンプ３２は、電極シートの芯材１０ｃの搬送に同調させて、塗布用ノズル３１に供給するものである。具体的には、塗液供給ポンプ３２は、シリンジポンプやギアポンプなどを用いて構成することができる。 The coating liquid supply pump 32 supplies the coating nozzle 31 in synchronism with the conveyance of the electrode sheet core 10c. Specifically, the coating liquid supply pump 32 can be configured using a syringe pump, a gear pump, or the like.
　バックアップローラ３３は、搬送中の電極シートの芯材１０ｃの厚み方向や幅方向の位置が変わらないようにするものである。塗布用ノズル３１とバックアップローラ３３とは、所定の間隔を設定して平行に配置されており、塗布用ノズル３１とバックアップローラ３３の間を電極シートの芯材１０ｃが通過するように配置されている。 The backup roller 33 prevents the position in the thickness direction and the width direction of the core material 10c of the electrode sheet being conveyed from changing. The coating nozzle 31 and the backup roller 33 are arranged in parallel with a predetermined interval therebetween, and are arranged so that the electrode sheet core 10c passes between the coating nozzle 31 and the backup roller 33. Yes.
　なお、電極シートの芯材１０ｃは、搬送経路中で方向が変えられる場合があるため、先端部３１ｈは、図１に示すような横向きに配置される場合や、上向き或いは下向きに配置される場合がある。また、塗布部３は、必要に応じて、補助搬送装置３４を備えた構成としても良い。なお、補助搬送装置３４は、電極シートの芯材１０ｃの両端部など、集電体材料が塗布されていない部分を支える構成にしておく。 In addition, since the direction of the core material 10c of the electrode sheet may be changed in the conveyance path, the leading end portion 31h is arranged sideways as shown in FIG. 1 or arranged upward or downward. There is. Moreover, the application unit 3 may be configured to include an auxiliary transport device 34 as necessary. The auxiliary conveying device 34 is configured to support a portion where the current collector material is not applied, such as both ends of the core member 10c of the electrode sheet.
　このような構成をしているため、塗布部３は、電極シートの芯材１０ｃを搬送させながら、電極シートの芯材１０ｃの表面に所定の厚さで集電体材料を塗布することができる。 Since it has such a configuration, the application unit 3 can apply the current collector material to the surface of the core material 10c of the electrode sheet with a predetermined thickness while conveying the core material 10c of the electrode sheet. .
　セパレータ供給部４は、セパレータ材料１１を供給するものである。
具体的には、セパレータ供給部４は、セパレータ巻出装置４０を備えて構成されている。 The separator supply unit 4 supplies the separator material 11.
Specifically, the separator supply unit 4 includes a separator unwinding device 40.
　セパレータ巻出装置４０は、集電体材料が塗布された電極シート１０ｅの搬送に同調させて、ロール状に巻き付けられたセパレータ材料１１を巻き出しながら供給するものである。 The separator unwinding device 40 supplies the separator material 11 wound in a roll shape while unwinding in synchronization with the conveyance of the electrode sheet 10e coated with the current collector material.
　セパレータ供給部４は、さらに、スプレーノズル４３ａを備えて構成しても良い。
スプレーノズル４３ａは、集電体材料が塗布された電極シート１０ｅと、セパレータ材料１１との密着性を高めるための結着剤を塗布するためのものである。スプレーノズル４３ａは、結着剤を図１に示す様なセパレータ材料１１側に塗布される形態のほか、集電体材料が塗布された電極シート１０ｅ側に塗布される形態であっても良い。 The separator supply unit 4 may further include a spray nozzle 43a.
The spray nozzle 43 a is for applying a binder for enhancing the adhesion between the electrode sheet 10 e to which the current collector material is applied and the separator material 11. The spray nozzle 43a may have a form in which the binder is applied on the electrode sheet 10e side on which the current collector material is applied, in addition to the form in which the binder is applied on the separator material 11 side as shown in FIG.
　セパレータ貼付部５は、集電体材料が塗布された電極シート１０ｅに、未乾燥の集電体材料の上から、セパレータ材料１１を貼り付けるものである。
具体的には、セパレータ貼付部５は、２本で１組のプレスローラ５１，５２を用いて構成されている。 The separator attaching part 5 attaches the separator material 11 to the electrode sheet 10e coated with the current collector material from above the undried current collector material.
Specifically, the separator attaching part 5 is configured by using a pair of press rollers 51 and 52.
　プレスローラ５１は、集電体材料が塗布された電極シート１０ｅの上面側に配置され、プレスローラ５２は、集電体材料が塗布された電極シート１０ｅの上面側に配置されている。そして、プレスローラ５１，５２は双方が、集電体材料が塗布された電極シート１０ｅの幅よりも長い円筒状のローラで構成されており、それぞれ互いに所定の隙間を設けて平行に配置されている。また、これらプレスローラ５１，５２の隙間は、集電体材料が塗布された電極シート１０ｅとセパレータ材料１１の総厚みと同じか、それよりも狭く設定されている。そして、集電体材料が塗布された電極シート１０ｅとセパレータ材料１１とを重ね合わせた状態で、これらプレスローラ５１，５２の間を通過させる。 The press roller 51 is disposed on the upper surface side of the electrode sheet 10e coated with the current collector material, and the press roller 52 is disposed on the upper surface side of the electrode sheet 10e coated with the current collector material. The press rollers 51 and 52 are both cylindrical rollers longer than the width of the electrode sheet 10e coated with the current collector material, and are arranged in parallel with a predetermined gap between each other. Yes. The gap between the press rollers 51 and 52 is set to be equal to or narrower than the total thickness of the electrode sheet 10e coated with the current collector material and the separator material 11. And it passes between these press rollers 51 and 52 in the state which piled up the electrode sheet 10e with which the collector material was apply | coated, and the separator material 11. FIG.
　このような構成をしているため、セパレータ貼付部５は、集電体材料が塗布された電極シート１０ｅに、未乾燥の集電体材料の上から、セパレータ材料１１を貼り合わせることができる。 Because of such a configuration, the separator attaching part 5 can attach the separator material 11 to the electrode sheet 10e coated with the current collector material from above the undried current collector material.
　乾燥部６は、集電体材料を乾燥させるものである。
具体的には、乾燥部６は、集電体材料が塗布されセパレータが貼り付けられた電極シートを通過させつつ、通路内の温度を高温にした、乾燥装置６０を用いて構成することができる。
乾燥装置６０は、搬送される電極シートの上面側や下面側に取り付けた赤外線ヒータ６１や、温風ファン６２、マイクロ波加熱装置６３などが備えられている。 The drying unit 6 is for drying the current collector material.
Specifically, the drying unit 6 can be configured by using a drying device 60 in which the temperature in the passage is increased while passing the electrode sheet on which the current collector material is applied and the separator is attached. .
The drying device 60 includes an infrared heater 61, a hot air fan 62, a microwave heating device 63, and the like attached to the upper surface side and lower surface side of the conveyed electrode sheet.
　電極シートの製造装置１は、上述の様な構成をしているため、本装置を用いて製造される電極シートが乾燥炉内で高温に曝されても、電極シートの表面に塗布された塗布物の表面側（つまり、外側）の溶剤成分が過剰に揮発するのを防ぐことができる。その結果、塗布物が表面乾燥したことによるひび割れの発生が抑制される。従って、塗布する活物質の膜厚を厚くしても、活物質の表面乾燥を抑えつつ、短時間で乾燥を行える。 Since the electrode sheet manufacturing apparatus 1 has the above-described configuration, the electrode sheet manufactured using the apparatus is coated on the surface of the electrode sheet even if it is exposed to a high temperature in a drying furnace. It is possible to prevent the solvent component on the surface side (that is, the outside) of the product from excessively volatilizing. As a result, the occurrence of cracks due to the dried surface of the coated product is suppressed. Therefore, even if the thickness of the active material to be applied is increased, drying can be performed in a short time while suppressing the surface drying of the active material.
　また、湿潤した塗布物とセパレータ材料との界面では毛細管現象が生じるため、溶剤線分が染み出しやすくなる。このとき、セパレータの内側（つまり、塗布物側）は湿潤状態であるが、セパレータの外側は高温で乾燥した雰囲気であるため、ひび割れを防ぎつつ、溶剤成分の乾燥を急速に行うことができる。 Also, since capillary action occurs at the interface between the wet coating and the separator material, the solvent line tends to ooze out. At this time, although the inside of the separator (that is, the coated material side) is in a wet state, the outside of the separator is in an atmosphere dried at a high temperature, so that the solvent component can be rapidly dried while preventing cracks.
　なお、セパレータ材料としては、一般の多孔質材料や通気性のある材料を選択することで、本発明を具現化することができる。 It should be noted that the present invention can be embodied by selecting a general porous material or a breathable material as the separator material.
　＜変形例＞
本発明に係る電極シートの製造装置１は、さらに、シートプレス部７を備えた構成としても良い。 <Modification>
The electrode sheet manufacturing apparatus 1 according to the present invention may further include a sheet press unit 7.
　シートプレス部７は、乾燥部６と電極シート巻取装置２２の間に配置され、セパレータ貼り付け後に集電体材料が乾燥した後の電極シート１０ｆを厚み方向に圧縮加工するものである。 The sheet press unit 7 is disposed between the drying unit 6 and the electrode sheet take-up device 22, and compresses the electrode sheet 10f after the current collector material is dried after attaching the separator in the thickness direction.
　具体的には、シートプレス部７は、所定の隙間を設けて平行に配置された上面側加圧ローラ７１と下面側加圧ローラ７２とを用いて構成することができる。上面側加圧ローラ７１と下面側加圧ローラ７２との隙間は、セパレータ貼り付け後に集電体材料が乾燥した後の電極シート１０ｆの厚みよりも狭く設定されている。また、上面側加圧ローラ７１と下面側加圧ローラ７２は、それぞれ矢印７１ｖ，矢印７２ｖの方向に回転するように構成されている。そして、当該電極シート１０ｆを、上面側加圧ローラ７１と下面側加圧ローラ７２との間を通過させる。 Specifically, the sheet press unit 7 can be configured using an upper surface side pressure roller 71 and a lower surface side pressure roller 72 which are arranged in parallel with a predetermined gap. The gap between the upper pressure roller 71 and the lower pressure roller 72 is set to be narrower than the thickness of the electrode sheet 10f after the current collector material is dried after the separator is attached. Further, the upper surface side pressure roller 71 and the lower surface side pressure roller 72 are configured to rotate in the directions of arrows 71v and 72v, respectively. Then, the electrode sheet 10 f is passed between the upper surface side pressure roller 71 and the lower surface side pressure roller 72.
　このような構成をしているため、シートプレス部７は、セパレータ貼り付け後に集電体材料が乾燥した後の電極シート１０ｆを厚み方向に圧縮加工することができる。 Since it has such a configuration, the sheet press unit 7 can compress the electrode sheet 10f after the current collector material is dried after the separator is pasted in the thickness direction.
　＜変形例＞
また、本発明に係る電極シートの製造装置１は、タブカット部８を備えた構成としても良い。 <Modification>
In addition, the electrode sheet manufacturing apparatus 1 according to the present invention may be configured to include a tab cut portion 8.
　タブカット部８は、乾燥部６と電極シート巻取装置２２の間に配置され、セパレータ貼り付け後に集電体材料が乾燥した後の電極シート１０ｆの集電体材料が塗布されていない芯材部分の一部を残して、他の集電体材料が塗布されていない芯材部分を除去するものである。 The tab cut portion 8 is disposed between the drying portion 6 and the electrode sheet take-up device 22, and the core material portion of the electrode sheet 10f after the current collector material is dried after the separator is pasted is not applied. The core material part to which other current collector material is not applied is removed while leaving a part of the material.
　具体的には、タブカット部８は、ロータリーカッターと呼ばれる円筒状の筐体に切断刃が備えられたものと、バックアップローラとを備えて構成することができる。ロータリーカッターとバックアップローラとは、互いに電極シートを挟み込むように回転し合い、集電体材料が塗布されていない芯材部分を所定の形状に切断できるように構成されている。 Specifically, the tab cut portion 8 can be configured to include a cylindrical housing called a rotary cutter provided with a cutting blade and a backup roller. The rotary cutter and the backup roller rotate so as to interpose the electrode sheet with each other, and are configured so that the core material portion to which the current collector material is not applied can be cut into a predetermined shape.
　このような構成をしているため、タブカット部８は、当該電極シート１０ｆの集電体材料が塗布されていない芯材部分を除去することができる。 Because of such a configuration, the tab cut portion 8 can remove the core portion of the electrode sheet 10f to which the current collector material is not applied.
　なお、シートプレス部７とタブカット部８は、両方を用いることもでき、例えば、集電体材料が間欠的に塗布される場合は、シートプレス部７をタブカット部８の上流側に配置し、集電体材料が連続的に塗布される場合は、シートプレス部７をタブカット部８の下流側に配置することが好ましい。 Both the sheet press part 7 and the tab cut part 8 can also be used. For example, when the current collector material is intermittently applied, the sheet press part 7 is arranged on the upstream side of the tab cut part 8, When the current collector material is continuously applied, it is preferable to dispose the sheet press portion 7 on the downstream side of the tab cut portion 8.
　＜別の形態＞
本発明を適用するにあたり、上述したような電極シートの芯材１０ｃの片面（図１で示す上面側）に集電体材料を塗布する形態に限らず、下述するような構成の電極シートの製造装置１ｂであっても良い。つまり、電極シートの製造装置１ｂは、電極シートの芯材１０ｃの両面（図２に示す上面側と下面側）に集電体材料を塗布し、セパレータ材料１１，１１ｂを貼り付ける構成をしている。 <Another form>
In applying the present invention, the present invention is not limited to the form in which the current collector material is applied to one side (the upper surface side shown in FIG. 1) of the core material 10c of the electrode sheet as described above. The manufacturing apparatus 1b may be used. That is, the electrode sheet manufacturing apparatus 1b is configured to apply the current collector material on both surfaces (the upper surface side and the lower surface side shown in FIG. 2) of the electrode sheet core 10c and paste the separator materials 11 and 11b. Yes.
　図２は、本発明を具現化する形態の別の一例を示す側面図である。
電極シートの製造装置１ｂは、シート搬送部２と、塗布部３ｂと、セパレータ供給部４ｂと、セパレータ貼付部５と、乾燥部６とを含んで構成されている。なお、電極シートの製造装置１ｂにおいて、シート搬送部２と、セパレータ貼付部５と、乾燥部６とは、上述の電極シートの製造装置１におけるそれらと同様の構成をしている。 FIG. 2 is a side view showing another example of a form embodying the present invention.
The electrode sheet manufacturing apparatus 1b includes a sheet conveyance unit 2, an application unit 3b, a separator supply unit 4b, a separator pasting unit 5, and a drying unit 6. In the electrode sheet manufacturing apparatus 1b, the sheet conveying section 2, the separator attaching section 5, and the drying section 6 have the same configuration as those in the above-described electrode sheet manufacturing apparatus 1.
　一方、塗布部３ｂは、上述した電極シートの製造装置１の塗布部３の構成に、塗布用ノズル３６と、塗液供給ポンプ３７をさらに備えた構成をしている。 On the other hand, the coating unit 3b has a configuration in which a coating nozzle 36 and a coating liquid supply pump 37 are further provided in the configuration of the coating unit 3 of the electrode sheet manufacturing apparatus 1 described above.
　塗布用ノズル３７は、上述の塗布用ノズル３１と同様、先端部３６ｈにスリット状の開口部を備えた、いわゆるスリットダイで構成されており、先端部３６ｈが、搬送される電極シートの芯材１０ｃの裏面（つまり、下面側）に向けて配置されている。 The coating nozzle 37 is formed of a so-called slit die having a slit-like opening at the tip 36h, similar to the coating nozzle 31 described above, and the tip 36h is the core material of the electrode sheet to be conveyed. It is arranged toward the back surface (that is, the lower surface side) of 10c.
　塗液供給ポンプ３７は、上述の塗液供給ポンプ３２と同様、電極シートの芯材１０ｃの搬送に同調させて、塗布用ノズル３６に供給するものである。具体的には、塗液供給ポンプ３７は、シリンジポンプやギアポンプなどを用いて構成することができる。 The coating liquid supply pump 37 is supplied to the coating nozzle 36 in synchronism with the conveyance of the core material 10c of the electrode sheet, like the coating liquid supply pump 32 described above. Specifically, the coating liquid supply pump 37 can be configured using a syringe pump, a gear pump, or the like.
　なお、電極シートの芯材１０ｃの両面に集電体材料を塗布する場合、図２に示す様に、塗布用ノズルを前後（つまり、対向しない位置）に配置しても良いし、お互いが対向する位置に配置しても良い。 In addition, when apply | coating a collector material to both surfaces of the core material 10c of an electrode sheet, as shown in FIG. 2, you may arrange | position the nozzle for application | coating back and forth (that is, the position which does not oppose), and mutually opposes You may arrange in the position to do.
　一方、セパレータ供給部４ｂは、上述した電極シートの製造装置１のセパレータ供給部４の構成に、セパレータ巻出装置４０ｂをさらに備えた構成をしている。 On the other hand, the separator supply unit 4b has a configuration in which the separator supply unit 4 of the electrode sheet manufacturing apparatus 1 described above is further provided with a separator unwinding device 40b.
　セパレータ巻出装置４０ｂは、上述のセパレータ巻出装置４０と同様、集電体材料が塗布された電極シート１０ｅの搬送に同調させて、ロール状に巻き付けられたセパレータ材料１１ｂを巻き出しながら供給するものである。 Similarly to the separator unwinding device 40 described above, the separator unwinding device 40b supplies the separator material 11b wound in a roll shape while unwinding in synchronization with the conveyance of the electrode sheet 10e coated with the current collector material. Is.
　セパレータ供給部４ｂは、さらに、スプレーノズル４３ｂを備えて構成しても良い。
スプレーノズル４３ｂは、上述したスプレーノズル４３と同様、集電体材料が塗布された電極シート１０ｅと、セパレータ材料１１ｂとの密着性を高めるための結着剤を塗布するためのものである。スプレーノズル４３ｂは、結着剤を図２に示す様なセパレータ材料１１ｂ側に塗布される形態のほか、集電体材料が塗布された電極シート１０ｅ側に塗布される形態であっても良い。 The separator supply unit 4b may further include a spray nozzle 43b.
The spray nozzle 43b is for applying a binder for improving the adhesion between the electrode sheet 10e to which the current collector material is applied and the separator material 11b, like the spray nozzle 43 described above. The spray nozzle 43b may be applied to the electrode sheet 10e side applied with the current collector material, in addition to the form in which the binder is applied to the separator material 11b side as shown in FIG.
　なお、セパレータ貼付部５や、シートプレス部７、タブカット部８における、上面側と下面側に一組で配置されたローラ同士の厚み方向の隙間は、適宜集電体材料の厚みや、セパレータ材料１１ｂの厚みが増加したことに対応して適宜調節しておく。 In addition, the gap in the thickness direction between the rollers disposed in a pair on the upper surface side and the lower surface side in the separator pasting portion 5, the sheet press portion 7, and the tab cut portion 8 is appropriately determined by the thickness of the current collector material or the separator material. It adjusts suitably corresponding to that the thickness of 11b increased.
　電極シートの製造装置１ｂは、上述の様な構成をしているため、電極シートの芯材１０ｃの両面（図２に示す上面側と下面側）に集電体材料を塗布し、セパレータ材料１１，１１ｂを貼り付けることができる。 Since the electrode sheet manufacturing apparatus 1b has the above-described configuration, the current collector material is applied to both surfaces (the upper surface side and the lower surface side shown in FIG. 2) of the core material 10c of the electrode sheet, and the separator material 11 , 11b can be pasted.
　そのため、本装置を用いて製造される電極シートが乾燥炉内で高温に曝されても、電極シートの両面に塗布された塗布物の溶剤成分が過剰に揮発するのを防ぐことができる。その結果、塗布物が表面乾燥したことによるひび割れの発生が抑制される。従って、塗布する活物質の膜厚を厚くしても、活物質の表面乾燥を抑えつつ、短時間で乾燥を行える。 Therefore, even if the electrode sheet manufactured using this apparatus is exposed to a high temperature in a drying furnace, it is possible to prevent excessive evaporation of the solvent component of the coating applied to both surfaces of the electrode sheet. As a result, the occurrence of cracks due to the dried surface of the coated product is suppressed. Therefore, even if the thickness of the active material to be applied is increased, drying can be performed in a short time while suppressing the surface drying of the active material.
　［電池用電極シートの製造工程］
上述では、本発明に係る電極シートの製造装置について説明を行ったが、電極シートの製造方法にも本発明を適用することができる。つまり、以下に示す手順により、電極シートを製造することができる。 [Battery electrode sheet manufacturing process]
Although the electrode sheet manufacturing apparatus according to the present invention has been described above, the present invention can also be applied to a method for manufacturing an electrode sheet. That is, an electrode sheet can be manufactured by the procedure shown below.
　図３は、本発明を具現化する形態の一例を示すフロー図である。図３には、電池用電極シートの製造するための一連のフローが、ステップ毎に示されている。 FIG. 3 is a flowchart showing an example of a form embodying the present invention. FIG. 3 shows a series of flows for manufacturing the battery electrode sheet for each step.
　先ず、電池用電極シートの芯材１０ｃを、シート搬送部２セットする（ｓ１１）。具体的には、電池用電極シートの芯材１０ｃが巻き付けられたリール２１ｒを電極シート巻出装置２１にセットする。そして、電池用電極シートの芯材１０ｃを電極シート巻出装置２１から引き出し、塗布部３，セパレータ貼付部５，乾燥部６へと架け渡して行く。そして、電池用電極シートの芯材１０ｃを電極シート巻取装置２２のリール２２ｒに巻き付け、
導電性シート１０ｃにかかる張力を調節したり、導電性シート１０ｃと、塗布部３，乾燥部４，セパレータ貼付部５，乾燥部６を構成する各機器との間隔を調節したりする。 First, the sheet conveying unit 2 sets the core material 10c of the battery electrode sheet (s11). Specifically, the reel 21 r around which the core material 10 c of the battery electrode sheet is wound is set in the electrode sheet unwinding device 21. And the core material 10c of the battery electrode sheet is pulled out from the electrode sheet unwinding device 21 and is spread over the application part 3, the separator attaching part 5, and the drying part 6. Then, the core material 10c of the battery electrode sheet is wound around the reel 22r of the electrode sheet winding device 22,
The tension | tensile_strength concerning the electroconductive sheet 10c is adjusted, and the space | interval of the electroconductive sheet 10c and each apparatus which comprises the application part 3, the drying part 4, the separator sticking part 5, and the drying part 6 is adjusted.
　その後、電池用電極シートの芯材１０ｃを、下流側（つまり、電極シート巻取装置２２側）に連続搬送させる（ｓ２１）。 Thereafter, the core material 10c of the battery electrode sheet is continuously conveyed to the downstream side (that is, the electrode sheet winding device 22 side) (s21).
　そして、電池用電極シートの芯材１０ｃを下流側に連続搬送させながら、塗布部３にて電池用電極シートの芯材１０ｃの表面に集電体材料を塗布する（ｓ３１）。このとき、片面塗布の形態であれば、一方の面側（例えば上面側）に集電体材料を塗布し、両面塗布の形態であれば、他方の面側（例えば下面側）にも集電体材料を塗布する。 Then, the current collector material is applied to the surface of the core material 10c of the battery electrode sheet by the application unit 3 while continuously conveying the core material 10c of the battery electrode sheet downstream (s31). At this time, the current collector material is applied to one surface side (for example, the upper surface side) in the case of single-sided application, and the current collector is also applied to the other surface side (for example, the lower surface side) in the case of double-sided application. Apply body material.
　集電体材料が塗布された電極シート１０ｅは、塗布部３の下流側に設置されたセパレータ貼付部５において、セパレータ供給部４のセパレータ巻出装置４０から巻き出し供給された（ｓ４１）セパレータ材料１１と、貼り合わされる（ｓ５１）。 The electrode sheet 10e coated with the current collector material is unwound and supplied from the separator unwinding device 40 of the separator supply unit 4 in the separator attaching unit 5 installed on the downstream side of the applying unit 3 (s41). 11 is bonded together (s51).
　セパレータが貼り付けられた電極シート１０ｓは、集電体材料が塗布後の未乾燥状態であるため、乾燥部６で乾燥が行われる（ｓ６１）。 The electrode sheet 10s to which the separator is attached is dried in the drying unit 6 because the current collector material is in an undried state after application (s61).
　集電体材料が乾燥した電極シート１０ｄは、そのままの状態で、若しくは必要に応じて集電体電極部を形成したり（ｓ７１）、加圧プレスされたり（ｓ８１）した後、電極シート巻取装置２２のリール２２ｒに巻き取り回収される。 The electrode sheet 10d after the current collector material is dried is used as it is or after forming the current collector electrode part as necessary (s71) or being pressed (s81), and then winding the electrode sheet It is wound and collected on the reel 22r of the device 22.
　そして、電極シート巻出装置２１から電池用電極シートの芯材１０ｃの巻き出しが終了したかどうかを判断する（ｓ９０）。巻き出しが終了していないと判断されれば、上記ステップｓ２１～ｓ９０を繰り返す。 Then, it is determined whether the unwinding of the core material 10c of the battery electrode sheet is completed from the electrode sheet unwinding device 21 (s90). If it is determined that the unwinding has not ended, the above steps s21 to s90 are repeated.
　一方、電極シートの巻き出しが終了していると判断されれば、電極シート１０の搬送を停止させ（ｓ９１）、電極シートを搬送部から取り出す（ｓ９２）。 On the other hand, if it is determined that the unwinding of the electrode sheet has been completed, the conveyance of the electrode sheet 10 is stopped (s91), and the electrode sheet is taken out from the conveyance unit (s92).
　＜別の形態＞
本発明を適用するにあたり、セパレータ材料は、少なくとも電極シートの芯材側の表面にセルロース繊維を含む材料で構成することが好ましい。 <Another form>
In applying the present invention, the separator material is preferably composed of a material containing cellulose fibers at least on the surface of the electrode sheet on the core material side.
　そうすれば、湿潤した塗布物とセルロース繊維との界面で毛細管現象が生じる。
また、セルロース繊維は、一般の樹脂材料と比較して耐熱温度が高いため、高温乾燥による短時間乾燥が可能となり、プロセスマージンを広くすることができる。 As a result, capillary action occurs at the interface between the wet coating and the cellulose fibers.
Further, since the cellulose fiber has a higher heat-resistant temperature than a general resin material, it can be dried for a short time by high-temperature drying, and the process margin can be widened.
　＜別の形態＞
本発明を適用するにあたり、セパレータ材料は、セルロース繊維と多孔質樹脂層を備えていることが好ましい。
<Another form>
In applying the present invention, the separator material preferably includes cellulose fibers and a porous resin layer.
　１　　電極シートの製造装置
　２　　シート搬送部
　３　　塗布部
　４　　セパレータ供給部
　５　　セパレータ貼付部
　６　　乾燥部
　７　　シートプレス部
　８　　タブカット部
　９　　制御部
　１０　　電極シート
　１０ｃ　電極シートの芯材
　１０ｅ　集電体材料が塗布された電極シート
　１０ｓ　セパレータが貼り付けられた電極シート
　１０ｄ　集電体材料が乾燥した電極シート
　１０ｐ　プレス加工された電極シート
　１１　　セパレータ材料
　１０２　活物質
　１０３　絶縁物
　１０ｖ　シート材搬送方向
　２１　　電極シート巻出装置
　２１ｒ　リール
　２２　　電極シート巻取装置
　２２ｒ　リール
　２３　　ローラコンベア（２３ａ～２３ｃ）
　２３ｍ　回転駆動用モータ
　３１　　塗布用ノズル（上面塗布用）
　３１ｈ　先端部
　３２　　塗液供給ポンプ（上面塗布用）
　３３　　バックアップローラ
　３４　　補助搬送装置
　３６　　塗布用ノズル（下面塗布用）
　３６ｈ　先端部
　３７　　塗液供給ポンプ（下面塗布用）
　４０　　セパレータ巻出装置（上面側用）
　４０ｂ　セパレータ巻出装置（下面側用）
　４３　　スプレーノズル（上面側用）
　４３ｂ　スプレーノズル（下面側用）
　５１　　プレスローラ（上面側）
　５２　　プレスローラ（下面側）
　６１　　赤外線ヒータ
　６２　　温風ファン
　６３　　マイクロ波加熱装置
　７１　　上面側加圧ローラ
　７２　　下面側加圧ローラ DESCRIPTION OF SYMBOLS 1 Electrode sheet manufacturing apparatus 2 Sheet conveyance part 3 Application | coating part 4 Separator supply part 5 Separator sticking part 6 Drying part 7 Sheet press part 8 Tab cut part 9 Control part 10 Electrode sheet 10c Electrode sheet core material 10e Current collector material is applied Electrode sheet 10s Electrode sheet with separator attached 10d Electrode sheet with collected current collector material 10p Pressed electrode sheet 11 Separator material 102 Active material 103 Insulator 10v Sheet material conveying direction 21 Electrode sheet unwinding device 21r reel 22 electrode sheet winding device 22r reel 23 roller conveyor (23a-23c)
23m Motor for rotational drive 31 Nozzle for coating (for top surface coating)
31h Tip 32 Coating liquid supply pump (for top coating)
33 Backup roller 34 Auxiliary transfer device 36 Application nozzle (for lower surface application)
36h Tip 37 Coating liquid supply pump (for bottom coating)
40 Separator unwinding device (for top side)
40b Separator unwinding device (for lower surface side)
43 Spray nozzle (for top side)
43b Spray nozzle (for bottom side)
51 Press roller (top side)
52 Press roller (bottom side)
61 Infrared heater 62 Hot air fan 63 Microwave heating device 71 Upper pressure roller 72 Lower pressure roller

Claims (8)

  1. 　電極シートの芯材を搬送するシート搬送部と、
    　前記電極シートの芯材の表面に集電体材料を塗布する塗布部と、
    　セパレータ材料を供給するセパレータ供給部と、
    　前記集電体材料が塗布された電極シートに未乾燥の集電体材料の上から前記セパレータ材料を貼り付けるセパレータ貼付部と、
    　前記集電体材料を乾燥させる乾燥部とを備えた
    電極シートの製造装置。     A sheet conveying section for conveying the core material of the electrode sheet;
    An application portion for applying a current collector material to the surface of the core material of the electrode sheet;
    A separator supply section for supplying a separator material;
    A separator attaching portion for attaching the separator material to the electrode sheet coated with the current collector material from above the undried current collector material;
    An electrode sheet manufacturing apparatus comprising: a drying unit that dries the current collector material.
  2. 　前記塗布部は、
    前記電極シートの芯材の表面側に集電体材料を塗布する第１塗布部と、
    当該電極シートの芯材の裏面側に集電体材料を塗布する第２塗布部とを備え、
    　前記セパレータ供給部は、第１セパレータ供給部と、第２セパレータ供給部とを備え、
    　前記セパレータ貼付部は、
    前記第１セパレータ供給部から供給されたセパレータ材料を前記第１塗布部で塗布された集電体材料の上から貼り付ける第１セパレータ貼付部と、
    前記第２セパレータ供給部から供給されたセパレータ材料を前記第２塗布部で塗布された集電体材料の上から貼り付ける第２セパレータ貼付部とを備えた
    ことを特徴とする、請求項１に記載の電極シートの製造装置。     The application part is
    A first application part for applying a current collector material to the surface side of the core material of the electrode sheet;
    A second application part for applying a current collector material to the back side of the core material of the electrode sheet;
    The separator supply unit includes a first separator supply unit and a second separator supply unit,
    The separator attaching part is
    A first separator affixing unit that affixes the separator material supplied from the first separator supply unit from above the current collector material applied by the first application unit;
    The apparatus further comprises: a second separator pasting unit that pastes the separator material supplied from the second separator supplying unit on the current collector material applied by the second application unit. The manufacturing apparatus of the electrode sheet of description.
  3. 　前記セパレータ材料は、少なくとも前記電極シートの芯材側の表面にセルロース繊維を含む材料で構成されている
    ことを特徴とする、請求項１又は請求項２に記載の電極シートの製造装置。     The said separator material is comprised with the material which contains a cellulose fiber in the surface at the side of the core material of the said electrode sheet at least, The manufacturing apparatus of the electrode sheet of Claim 1 or Claim 2 characterized by the above-mentioned.
  4. 　前記セパレータ材料は、セルロース繊維層と多孔質樹脂層とを備えている
    ことを特徴とする、請求項３に記載の電極シートの製造装置。     The said separator material is equipped with the cellulose fiber layer and the porous resin layer, The manufacturing apparatus of the electrode sheet of Claim 3 characterized by the above-mentioned.
  5. 　電極シートの芯材を供給する芯材供給工程と、
    　前記電極シートの芯材の表面に集電体材料を塗布する塗布工程と、
    　セパレータ材料を供給するセパレータ供給工程と、
    　前記電極シートの芯材に対して未乾燥の集電体材料の上から前記セパレータ材料を貼り付けるセパレータ貼付工程と、
    　前記集電体材料を乾燥させる乾燥工程とを有し、
    塗布工程、セパレータ貼付工程、乾燥工程の順で各工程が進められる
    電極シートの製造方法。     A core material supplying step for supplying the core material of the electrode sheet;
    An application step of applying a current collector material to the surface of the core of the electrode sheet;
    A separator supplying step for supplying a separator material;
    A separator attaching step of attaching the separator material to the core of the electrode sheet from above the undried current collector material;
    A drying step of drying the current collector material,
    An electrode sheet manufacturing method in which each step proceeds in the order of a coating step, a separator attaching step, and a drying step.
  6. 　前記塗布工程は、
    前記電極シートの芯材の表面側に集電体材料を塗布する第１塗布工程と、
    当該電極シートの芯材の裏面側に集電体材料を塗布する第２塗布工程とを有し、
    　前記セパレータ供給工程は、第１セパレータ供給工程と、第２セパレータ供給工程とを有し、
    　前記セパレータ貼付工程は、
    前記第１セパレータ供給工程から供給されたセパレータ材料を前記第１塗布工程で塗布された集電体材料の上から貼り付ける第１セパレータ貼付工程と、
    前記第２セパレータ供給工程から供給されたセパレータ材料を前記第２塗布工程で塗布された集電体材料の上から貼り付ける第２セパレータ貼付工程とを有した
    ことを特徴とする、請求項５に記載の電極シートの製造方法。     The coating process includes
    A first application step of applying a current collector material to the surface side of the core material of the electrode sheet;
    A second application step of applying a current collector material to the back side of the core material of the electrode sheet,
    The separator supply step includes a first separator supply step and a second separator supply step,
    The separator attaching step is
    A first separator attaching step for attaching the separator material supplied from the first separator supplying step on the current collector material applied in the first applying step;
    6. The second separator pasting step of pasting the separator material supplied from the second separator supplying step on the current collector material applied in the second applying step. The manufacturing method of the electrode sheet of description.
  7. 　前記セパレータ材料は、少なくとも前記電極シートの芯材側の表面にセルロース繊維を含む材料で構成されている
    ことを特徴とする、請求項５又は請求項６に記載の電極シートの製造方法。     The said separator material is comprised with the material which contains a cellulose fiber at least on the surface at the side of the core material of the said electrode sheet, The manufacturing method of the electrode sheet of Claim 5 or Claim 6 characterized by the above-mentioned.
  8. 　前記セパレータ材料は、セルロース繊維層と多孔質樹脂層とを備えている
    ことを特徴とする、請求項７に記載の電極シートの製造方法。     The said separator material is equipped with the cellulose fiber layer and the porous resin layer, The manufacturing method of the electrode sheet of Claim 7 characterized by the above-mentioned.
PCT/JP2014/077508 2014-10-16 2014-10-16 Electrode sheet production device and production method WO2016059693A1 (en)

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