JP3466436B2 - Coating liquid coating device for sheet electrodes - Google Patents
Coating liquid coating device for sheet electrodesInfo
- Publication number
- JP3466436B2 JP3466436B2 JP25526097A JP25526097A JP3466436B2 JP 3466436 B2 JP3466436 B2 JP 3466436B2 JP 25526097 A JP25526097 A JP 25526097A JP 25526097 A JP25526097 A JP 25526097A JP 3466436 B2 JP3466436 B2 JP 3466436B2
- Authority
- JP
- Japan
- Prior art keywords
- coating liquid
- coating
- sheet
- storage hopper
- liquid storage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- 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
Landscapes
- Battery Electrode And Active Subsutance (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シート状電極用の
塗工液塗布装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating liquid application device for sheet electrodes.
【０００２】[0002]
【従来の技術】近年、カメラ一体型 VTR、ラップトップ
パソコン、携帯電話などの各種の電子機器の小型化、軽
量化に伴って、それらの電源として高エネルギー密度の
二次電池の要求が高まっており、たとえば炭素材料を負
極活物質とするリチウム二次電池の研究が盛んに行われ
ている。2. Description of the Related Art In recent years, with the miniaturization and weight reduction of various electronic devices such as VTRs with built-in cameras, laptop personal computers, and mobile phones, the demand for high energy density secondary batteries has increased as their power source. Therefore, for example, a lithium secondary battery using a carbon material as a negative electrode active material has been actively researched.
【０００３】しかしながら、リチウム電池に代表される
非水電解質電池は、非水電解質の電気伝導度が水系電解
質に比べて低いため、電極板を薄くする必要がある。ま
た、大電流を取り出すには、反応面積を大きくする必要
があるため、正、負の両電極をシート状にし、これらの
電極シートをセパレータを介してロール状に捲回した渦
巻き式構造が採用されている。However, in a non-aqueous electrolyte battery typified by a lithium battery, since the electric conductivity of the non-aqueous electrolyte is lower than that of the water-based electrolyte, it is necessary to thin the electrode plate. Also, in order to take out a large current, it is necessary to increase the reaction area, so both positive and negative electrodes are made into a sheet shape, and a spiral structure in which these electrode sheets are wound into a roll shape with a separator is adopted. Has been done.
【０００４】このようなシート状の電極は、一般的に、
電極活物質に導電剤、結着剤、溶媒を添加・混練して、
スラリー状の塗工液（電極合剤）を調製し、この塗工液
を、たとえばポリエチレンテレフタレートフイルムなど
の電極基材面に、ナイフコーター方式などの塗工方式で
塗布し、乾燥することによって製造されている。Such a sheet-shaped electrode is generally
Add and knead a conductive agent, a binder, and a solvent to the electrode active material,
Produced by preparing a slurry coating solution (electrode mixture), applying this coating solution to the surface of an electrode substrate such as polyethylene terephthalate film by a coating method such as knife coater method, and then drying. Has been done.
【０００５】より具体的に説明すると、塗工バックアッ
プローラの周面を底面とする形状の塗工液収容ホッパー
を配置し、この塗工液収容ホッパー内に塗工液を収容す
る。一方、前記塗工バックアップローラ周面に沿わせ、
塗工液収容ホッパーの底面を成す形でシート状電極基材
を搬送し、搬送されるシート状電極基材面に塗工液を塗
布をする。また、塗工バックアップローラ周面に沿って
塗工液収容ホッパーから出る段階で、塗工液収容ホッパ
ー端面部に、予め摺接可能に配置されている塗工膜厚調
整スリット（もしくはクリアランスを有するスリット）
により塗布膜の厚さが調製される。その後、たとえばト
ンネル型乾燥炉を搬送され、乾燥処理を施されてシート
状の電極が得られる。More specifically, a coating liquid storage hopper having a shape in which the peripheral surface of the coating backup roller is the bottom surface is arranged, and the coating liquid is stored in the coating liquid storage hopper. On the other hand, along the peripheral surface of the coating backup roller,
The sheet-shaped electrode base material is conveyed in a form of the bottom surface of the coating liquid storage hopper, and the coating liquid is applied to the conveyed sheet-shaped electrode base material surface. Further, at the stage of exiting from the coating liquid accommodating hopper along the peripheral surface of the coating backup roller, the coating film thickness adjusting slit (or clearance having a clearance which is arranged in advance in slidable contact with the end surface of the coating liquid accommodating hopper) is provided. slit)
The thickness of the coating film is adjusted by. After that, for example, it is transported to a tunnel type drying furnace and subjected to a drying treatment to obtain a sheet-shaped electrode.
【０００６】なお、電池用電極においては、一般的に、
単位体積当りの電極合剤（活物質）の密度によって、電
池の特性が左右される。したがって、電極合剤の塗布膜
厚はできるだけ一様なことが、二次電池の品質維持から
望まれる。In the battery electrode, generally,
The characteristics of the battery depend on the density of the electrode mixture (active material) per unit volume. Therefore, in order to maintain the quality of the secondary battery, it is desired that the coating thickness of the electrode mixture be as uniform as possible.
【０００７】[0007]
【発明が解決しようとする課題】しかし、上記シート状
電極基材面に塗工液を塗布する手段は、次のような問題
が懸念される。すなわち、シート状電極基材面に塗布さ
れるスラリー状の塗工液の膜厚は、基本的に、塗工膜厚
調整スリット（クリアランスを有するスリット）と、塗
工バックアップローラ周面で搬送されるシート状電極基
材面とのクリアランスとによって決定される。換言する
と、塗工膜厚調整スリットを通過する際、塗工膜厚調整
スリットの摺接端面と、シート状電極基材面との間隔に
よって塗布膜の厚さが決定される。However, the means for applying the coating liquid on the surface of the sheet-shaped electrode base material may cause the following problems. That is, the film thickness of the slurry-like coating liquid applied to the surface of the sheet-shaped electrode base material is basically conveyed by the coating film thickness adjusting slit (slit having a clearance) and the coating backup roller peripheral surface. It is determined by the clearance from the sheet-shaped electrode base material surface. In other words, when passing through the coating film thickness adjusting slit, the thickness of the coating film is determined by the distance between the sliding contact end face of the coating film thickness adjusting slit and the sheet-shaped electrode base material surface.
【０００８】しかし、スラリー状の塗工液（電極合剤）
の粘度が比較的低い場合、塗工液収容ホッパー内のスラ
リー状塗工液量によって、塗工膜厚調整スリット部を通
過する際の圧力が変化するので、シート状電極基材面と
のクリアランスが一定であっても、電極合剤の塗工に膜
が変化する。つまり、スラリー状塗工液の粘度が比較的
低いと、そのスラリー状塗工液自体の重量の影響によっ
て、塗工膜厚調整スリット部に加わる圧力が変化するた
め、塗工膜厚調整スリットのみによる塗布膜厚の一定制
御は困難である。However, a slurry-like coating liquid (electrode mixture)
When the viscosity of the coating liquid is relatively low, the pressure when passing through the coating film thickness adjusting slit part changes depending on the amount of the slurry coating liquid in the coating liquid storage hopper. Even when the value is constant, the film changes during the coating of the electrode mixture. That is, when the viscosity of the slurry coating liquid is relatively low, the pressure applied to the coating film thickness adjusting slit portion changes due to the influence of the weight of the slurry coating liquid itself. It is difficult to control the coating film thickness by the constant method.
【０００９】上記塗布膜厚のバラツキ発生防止対策とし
ては、塗工によるスラリー状塗工液の消費（使用）量に
対応して、たとえば定量ポンプなどで、塗工液収容ホッ
パー内のスラリー状塗工液を補給する手段も考えられ
る。この手段は、スラリー状塗工液の消費速度（使用速
度）と定量ポンプの供給速度との一致を前提とするが、
実際的には、微小なバラツキ発生が不可避的で、連続的
な塗工液の塗布（塗工）工程において、前記微小なバラ
ツキが累積して、連続的に一様な塗布膜を形成すること
が困難である。As a measure for preventing the variation of the coating film thickness, the slurry coating liquid in the coating liquid storage hopper is adjusted by, for example, a metering pump in accordance with the consumption (use) amount of the slurry coating liquid during coating. Means for replenishing the working fluid may be considered. This means is based on the assumption that the consumption rate (usage rate) of the slurry coating solution and the supply rate of the metering pump are the same.
In practice, it is inevitable that minute variations will occur, and in the continuous coating liquid application (coating) step, the minute variations will accumulate to form a continuous uniform coating film. Is difficult.
【００１０】本発明は、このような問題を解決するため
になされたもので、シート状の電極支持基材の長手方向
に、連続的にほぼ一様な電極合剤膜の塗布（塗着）形成
が可能なシート状電極用の塗工液塗布装置の提供を目的
とする。The present invention has been made in order to solve such a problem, and continuously and substantially uniformly coats (coats) an electrode mixture film in the longitudinal direction of a sheet-shaped electrode supporting base material. An object of the present invention is to provide a coating liquid application device for sheet-shaped electrodes that can be formed.
【００１１】[0011]
【課題を解決するための手段】請求項１の発明は、シー
ト状電極基材を周面に沿わせて搬送する塗工バックアッ
プローラと、前記塗工バックアップローラ周面に沿って
搬送されるシート状電極基材面を底面とする塗工液収容
ホッパーと、前記塗工液収容ホッパーのシート状電極基
材下流側の端面に摺接可能に配置された塗工膜厚調整ス
リットと、前記塗工液収容ホッパー内に収納され、塗工
液面に浮上する浮上型フロートと、前記浮上型フロート
の浮上位置の変位を非接触に測定する浮上位置測定手段
と、前記塗工液収容ホッパーに収容される塗工液の液面
よりも下部の前記塗工液収容ホッパーの側壁に配設さ
れ、前記浮上位置測定手段の測定結果に基づいて、供給
ポンプにより圧送された塗工液を前記塗工液収容ホッパ
ー内に供給する配管とを有することを特徴とするシート
状電極用の塗工液塗布装置である。According to a first aspect of the present invention, there is provided a coating backup roller which conveys a sheet-shaped electrode base material along a peripheral surface thereof, and a sheet which is conveyed along the peripheral surface of the coating backup roller. Liquid-containing hopper having a bottom surface of the electrode-like electrode base material, a coating film thickness adjusting slit arranged so as to be slidably contactable with the end surface of the coating liquid-containing hopper on the downstream side of the sheet-shaped electrode base material, Floating type float that is stored in the working liquid storage hopper and floats above the coating liquid surface, floating position measuring means that measures the displacement of the floating position of the floating float in a non-contact manner, and is stored in the coating liquid storage hopper. Coating liquid level
Installed on the side wall of the coating liquid storage hopper below
Based on the measurement result of the flying position measuring means, supply
The coating liquid containing hopper for pumping the coating liquid pumped by the pump.
A coating liquid application device for a sheet-shaped electrode, characterized in that it has a pipe for supplying the liquid inside .
【００１２】請求項２の発明は、シート状電極基材を周
面に沿わせて搬送する塗工バックアップローラと、前記
塗工バックアップローラ周面に沿って搬送されるシート
状電極基材面を底面とする塗工液収容ホッパーと、前記
塗工液収容ホッパーのシート状電極基材下流側の端面に
摺接可能に配置された塗工膜厚調整スリットと、前記塗
工液収容ホッパー内に収納され、塗工液面に浮上する浮
上型フロートと、 前記浮上型フロートの浮上位置の変
位を非接触に測定する浮上位置測定手段と、前記浮上型
フロートの浮上位置の変位に応じて、塗工液収容ホッパ
ー内への塗工液供給を指示する塗工液供給指示手段と、
前記塗工液収容ホッパーに収容される塗工液の液面より
も下部の前記塗工液収容ホッパーの側壁に配設され、前
記塗工液供給指示手段の指示に基づいて、供給ポンプに
より圧送された塗工液を前記塗工液収容ホッパー内に供
給する配管とを有することを特徴とするシート状電極用
の塗工液塗布装置である。According to a second aspect of the present invention, there is provided a coating backup roller which conveys the sheet-shaped electrode base material along the peripheral surface, and a sheet-shaped electrode base material surface which is conveyed along the peripheral surface of the coating backup roller. A coating liquid accommodating hopper to be a bottom surface, a coating film thickness adjusting slit arranged slidably on an end face of the coating liquid accommodating hopper on the downstream side of the sheet-shaped electrode substrate, and in the coating liquid accommodating hopper. The floating float that is stored and floats on the surface of the coating liquid, the floating position measuring means that measures the displacement of the floating position of the floating float in a non-contact manner, and the floating position of the floating float is adjusted according to the displacement of the floating position. Coating liquid supply instructing means for instructing the supply of the coating liquid into the working liquid storage hopper,
From the liquid surface of the coating liquid stored in the coating liquid storage hopper
Is also installed on the side wall of the coating liquid storage hopper at the bottom,
Based on the instruction of the coating liquid supply instruction means,
The more pumped coating liquid is supplied to the coating liquid storage hopper.
A coating liquid application device for a sheet-shaped electrode, characterized in that it has a supply pipe .
【００１３】請求項１，２の発明において、シート状の
電極基材としては、たとえばポリエチレンテレフタレー
トフイルムなどの樹脂フイルム、集電体としての機能を
持たせるアルミニウム、銅、ニッケル、チタン、ステン
レスなどの金属箔が挙げられる。また、シート状の電極
基材の形態は、無孔なシート、孔あきシート、ネット状
（網状）シートなどであり、その厚さは20〜50μm とす
ることが好ましい。In the first and second aspects of the invention, the sheet-shaped electrode base material is, for example, a resin film such as polyethylene terephthalate film, or aluminum, copper, nickel, titanium, stainless steel or the like having a function as a current collector. Examples include metal foil. Further, the form of the sheet-like electrode base material is a non-porous sheet, a perforated sheet, a net-like (mesh-like) sheet or the like, and the thickness thereof is preferably 20 to 50 μm.
【００１４】請求項１，２の発明において、使用する塗
工液（電極合剤）は、電極活物質、導電剤、結着剤、溶
媒などを含むたとえばペースト状の組成物で、リチウム
電池用、リチウムイオン電池用、ニッケル水素電池用な
どが挙げられる。In the invention of claims 1 and 2, the coating liquid (electrode mixture) used is, for example, a paste-like composition containing an electrode active material, a conductive agent, a binder, a solvent, etc. , Lithium-ion batteries, nickel-hydrogen batteries, and the like.
【００１５】より詳しくリチウム電池用の場合について
説明すると、電極活物質としては、たとえば H+ 、L
i+ 、Na+ 、 K+ をおよび／または放出できる化合物な
らいずれでもよいが、なかでも遷移金属酸化物、遷移金
属カルコゲナイド、炭素質材料などが好ましく、特に、
リチウム含有遷移金属酸化物または炭素質材料の使用が
好ましい。なお、遷移金属としては、Co，Mn，Ni， V，
Feを主体とするものが好ましく、このような遷移金属酸
化物としては、 LiCoO2 ， LiNiO2 ，LiMn2 O4 ，LiCo
VO4 ，LiNiVO4 ，LiCo0.9 Sn0.1 O2 ，Fe3 O4 ， V2
O5 などが例示される。The case of a lithium battery will be described in more detail. Examples of the electrode active material include H + and L.
Any compound that can release and / or release i + , Na + , and K + may be used, but among them, a transition metal oxide, a transition metal chalcogenide, a carbonaceous material, etc. are preferable, and particularly,
The use of lithium-containing transition metal oxides or carbonaceous materials is preferred. The transition metals include Co, Mn, Ni, V,
Fe-based ones are preferable, and examples of such transition metal oxides include LiCoO 2 , LiNiO 2 , LiMn 2 O 4 , and LiCo.
VO 4 , LiNiVO 4 , LiCo 0.9 Sn 0.1 O 2 , Fe 3 O 4 , V 2
O 5 and the like are exemplified.
【００１６】また、炭素質材料としては、 002面の面間
隔が 0.335〜0.38nm、密度が 1.1〜2.3g/cm3 のものの
使用が好ましく、具体的には、黒鉛、石油コークス、ク
レゾール樹脂焼成炭素、フラン樹脂焼成炭素、ポリアク
リロニトリル繊維焼成炭素、気相成長炭素、メソフェー
ズピッチ焼成炭素などを挙げることができる。As the carbonaceous material, it is preferable to use one having a 002 plane spacing of 0.335 to 0.38 nm and a density of 1.1 to 2.3 g / cm 3 , specifically, graphite, petroleum coke, cresol resin firing. Examples include carbon, furan resin fired carbon, polyacrylonitrile fiber fired carbon, vapor grown carbon, mesophase pitch fired carbon, and the like.
【００１７】導電剤としては、構成される電池におい
て、化学変化を起こさない電子伝導性材料であれば、特
に限定されない。通常、天然黒鉛（鱗状黒鉛、鱗片状黒
鉛など）、人工黒鉛、カーボンブラック、アセチレンブ
ラック、ケッチェンブラック、炭素繊維、金属粉、金属
繊維あるいはポリフェニレン誘導体などの導電性材料
を、１種単独でまたは２種以上混合して使用することが
でき、特に、黒鉛とアセチレンブラックとの併用が好ま
しい。The conductive agent is not particularly limited as long as it is an electron conductive material that does not cause a chemical change in the battery to be constructed. Usually, one kind of conductive material such as natural graphite (scaly graphite, flake graphite, etc.), artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, metal powder, metal fiber or polyphenylene derivative alone or Two or more kinds can be mixed and used, and it is particularly preferable to use graphite and acetylene black together.
【００１８】結着剤としては、非水電解質電池に使用す
る有機電解液に溶解または膨潤しにくい多糖類、熱可塑
性樹脂、あるいはゴム弾性を有するポリマーを、１種ま
たは２種以上混合して用いることができる。具体的に
は、澱粉、カルボキシメチルセルロース、ヒドロキシプ
ロピルセルロース、ポリビニルアルコール、ポリビニル
クロリド、ポリテトラフルオロエチレン、ポリフッ化ビ
ニリデン、フッ素ゴム、エチレン−プロピレン−ジエン
タ−ポリマー（EPDM）、スチレンブタジエンゴム、ポリ
ブタジエン、ポリエチレンオキシドなどが挙げられる。
これらの結着剤は、溶液、分散または懸濁などのように
エマルジョン状態であってもよい。As the binder, one or two or more kinds of polysaccharides, thermoplastic resins, or polymers having rubber elasticity which are difficult to dissolve or swell in the organic electrolyte used in the non-aqueous electrolyte battery are used. be able to. Specifically, starch, carboxymethyl cellulose, hydroxypropyl cellulose, polyvinyl alcohol, polyvinyl chloride, polytetrafluoroethylene, polyvinylidene fluoride, fluororubber, ethylene-propylene-dienta-polymer (EPDM), styrene-butadiene rubber, polybutadiene, polybutadiene. Examples thereof include ethylene oxide.
These binders may be in an emulsion state such as solution, dispersion or suspension.
【００１９】さらに、上記電極活物質、導電剤、結着剤
を混練する際の溶媒としては、水あるいは１種または２
種以上の有機溶剤の混合物を用いることができる。有機
溶剤の種類は特に限定されないが、N-メチルピロリド
ン、キシレン、トルエン、アセトン、メチルエチルケト
ン、メチルイソブチルケトン、シクロヘキサノン、エタ
ノール、メタノール、酢酸エチル、酢酸ブチル、メチレ
ンクロライド、エチレンクロライド、エチルセロソルブ
などの使用が好ましい。Further, as the solvent for kneading the above-mentioned electrode active material, conductive agent, and binder, water or one or two
Mixtures of more than one organic solvent can be used. The type of organic solvent is not particularly limited, but use of N-methylpyrrolidone, xylene, toluene, acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, ethanol, methanol, ethyl acetate, butyl acetate, methylene chloride, ethylene chloride, ethyl cellosolve, etc. Is preferred.
【００２０】請求項１，２の発明において、塗工液収容
ホッパーに収容されている塗工液（電極合剤）の液面位
置（高さ）を測定するために、塗工液面に浮上させる浮
上型フロートは、たとえばポリエチレン樹脂製の有底容
器など、電極活物質などを含有する塗工液に浮くもの
で、かつ塗工液収容ホッパー内の塗工液に浮遊する形状
であれば、特に、材質や形状は限定されない。In the first and second aspects of the invention, in order to measure the liquid surface position (height) of the coating liquid (electrode mixture) contained in the coating liquid containing hopper, it floats on the surface of the coating liquid. The floating float to be floated in a coating liquid containing an electrode active material or the like, such as a bottomed container made of polyethylene resin, and has a shape that floats in the coating liquid in the coating liquid storage hopper, In particular, the material and shape are not limited.
【００２１】また、前記浮上型フロートの浮上位置の変
位を非接触に測定する浮上位置測定の一般的な手段とし
ては、たとえば塗工液収容ホッパー上方から超音波を当
てその反射で浮上位置を測定する方式、あるいは塗工液
収容ホッパー上方から光を当てその反射で浮上位置を測
定する方式が挙げられる。その他、塗工液収容ホッパー
が透光性を有する場合は、側面側から光を当てその反射
で浮上位置を測定する方式を採ることもできる。Further, as a general means for measuring the floating position of the floating type float, the floating position is measured in a non-contact manner. For example, ultrasonic waves are applied from above the coating solution containing hopper to measure the floating position. Or a method in which light is applied from above the coating liquid accommodating hopper and the flying position is measured by its reflection. In addition, when the coating liquid storage hopper has a light-transmitting property, it is possible to adopt a method in which light is applied from the side surface side and the flying position is measured by its reflection.
【００２２】より具体的に説明すると、たとえば超音波
のエコー時間から距離をリニアに測定する方式、光電式
もしくはレーザー光を用いる反射型の距離センサ方式や
リニア型のセンサ方式などが挙げられる。そして、リニ
ア型のセンサを用いる場合は、浮上型フロートの浮上位
置の微妙な変位を容易に測定・検出できる。More specifically, for example, a method of linearly measuring the distance from the echo time of an ultrasonic wave, a photoelectric distance sensor, a reflection type distance sensor method using laser light, a linear type sensor method, or the like can be used. When a linear type sensor is used, it is possible to easily measure and detect a subtle displacement of the floating position of the floating float.
【００２３】さらに、請求項２の発明において、浮上型
フロートの浮上位置の変位に応じて、塗工液収容ホッパ
ー内へ塗工液の供給を指示する塗工液供給指示手段は、
たとえばブザーや光源の点灯などであるが、これらの信
号に連動して、塗工液収容ホッパーに、応分の塗工液を
自動的に供給する方式を採ってもよい。すなわち、浮上
位置測定手段の出力、たとえばリニア型のセンサからの
アナログ出力に対して、予め、閾値を設定しておき、こ
の閾値によって塗工液を供給する供給ポンプの動作をオ
ン・オフさせることにより、自動的な供給が可能であ
る。なお、供給ポンプとして、供給量をリニアにコント
ロールできるポンプを使用すれば、前記アナログ出力に
対して塗工液の供給を斬新的にコントロールできるの
で、塗工液収容ホッパー内の塗工液を一定量化するうえ
で、さらに好ましい。Further, in the invention of claim 2, the coating liquid supply instructing means for instructing the supply of the coating liquid into the coating liquid accommodating hopper according to the displacement of the floating position of the floating float,
For example, a buzzer or a light source is turned on, but a system may be adopted in which the corresponding coating liquid is automatically supplied to the coating liquid storage hopper in conjunction with these signals. That is, a threshold value is set in advance for the output of the flying position measuring means, for example, the analog output from the linear type sensor, and the operation of the supply pump that supplies the coating liquid is turned on / off according to this threshold value. Allows automatic supply. If a pump that can linearly control the supply amount is used as the supply pump, the supply of the coating liquid can be innovatively controlled with respect to the analog output, so that the coating liquid in the coating liquid storage hopper can be kept constant. It is more preferable for quantification.
【００２４】請求項１，２の発明では、塗工液収容ホッ
パー内の塗工液使用量（消費量）が、浮上型フロートに
よって容易に検出される。すなわち、塗工液の使用（消
費）に伴って変位する塗工液収容ホッパー内の塗工液面
が、容易に、かつ精度よく測定・検出されるため、塗工
液収容ホッパー内の塗工液使用量に応答して、順次、塗
工液を補充することができる。According to the first and second aspects of the invention, the usage amount (consumption amount) of the coating liquid in the coating liquid storage hopper can be easily detected by the floating float. That is, since the coating liquid surface in the coating liquid storage hopper, which is displaced by the use (consumption) of the coating liquid, can be easily and accurately measured and detected, the coating liquid in the coating liquid storage hopper can be easily detected. The coating liquid can be sequentially replenished in response to the liquid usage amount.
【００２５】したがって、塗布膜の厚さを制御するスリ
ット部の圧力をほぼ一定に保持できるので、塗工液の粘
度が比較的低くて、塗工液自体の重量の影響による塗布
膜厚のバラツキ発生などが解消される。つまり、スラリ
ー状のって、塗工液の粘度に影響されることなく、常
時、全体的にほぼ一定の電極合剤層を備えたシート状電
極を、歩留まりよく提供できるので、結果的に、信頼性
の高い電池を提供できる。Therefore, since the pressure of the slit portion for controlling the thickness of the coating film can be kept substantially constant, the viscosity of the coating liquid is relatively low and the coating film thickness varies due to the influence of the weight of the coating liquid itself. Occurrence is eliminated. That is, as a slurry, without being affected by the viscosity of the coating liquid, it is possible to always provide a sheet-like electrode having an electrode mixture layer that is substantially constant throughout, with a high yield. A highly reliable battery can be provided.
【００２６】[0026]
【発明の実施の形態】以下、図１および図２を参照して
実施例を説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described below with reference to FIGS. 1 and 2.
【００２７】図１は、リチウムポリマー電池用の塗工液
塗布装置の要部構成を示すブロック図である。図１にお
いて、１はシート状電極基材２の巻き戻しローラ、３は
前記シート状電極基材２を周面に沿わせて搬送する塗工
バックアップローラ、４は前記塗工バックアップローラ
３周面に沿って搬送されるシート状電極基材２面を底面
とする塗工液収容ホッパーである。また、５は前記塗工
液収容ホッパー４と塗工バックアップローラ３の周面と
の間の搬送・通過で塗布された塗工液（電極合剤）を乾
燥するトンネル型乾燥炉、６は前記ンネル型乾燥炉５で
乾燥処理されたシート状電極基材２′を搬送ガイドする
ガイドローラ、７は前記シート状電極基材２′の巻き取
りローラである。FIG. 1 is a block diagram showing the essential structure of a coating liquid application device for a lithium polymer battery. In FIG. 1, 1 is a rewinding roller for the sheet-shaped electrode base material 2, 3 is a coating backup roller that conveys the sheet-shaped electrode base material 2 along the peripheral surface, and 4 is a peripheral surface of the coating backup roller 3. It is a coating liquid accommodating hopper whose bottom surface is the surface of the sheet-shaped electrode base material 2 which is conveyed along. Further, 5 is a tunnel-type drying oven for drying the coating liquid (electrode mixture) applied by conveying / passing between the coating liquid storage hopper 4 and the peripheral surface of the coating backup roller 3, and 6 is the above-mentioned A guide roller for conveying and guiding the sheet-shaped electrode base material 2 ′ dried in the tunnel type drying furnace 5, and a winding roller 7 for the sheet-shaped electrode base material 2 ′.
【００２８】ここで、シート状電極基材２は、たとえば
厚さ10〜 100μm 程度のポリエチレンテレフタレート樹
脂フイルムであり、また、塗工バックアップローラ３
は、たとえば直径50〜 200mm程度の金属製ローラであ
る。そして、塗工バックアップローラ３周面に沿って搬
送されるシート状電極基材２面を底面とする塗工液収容
ホッパー４は、図２に拡大して断面的に示すように構成
されている。Here, the sheet-shaped electrode base material 2 is, for example, a polyethylene terephthalate resin film having a thickness of about 10 to 100 μm, and the coating backup roller 3 is used.
Is, for example, a metal roller having a diameter of about 50 to 200 mm. The coating liquid storage hopper 4 having the sheet-shaped electrode base material 2 surface as the bottom surface, which is conveyed along the peripheral surface of the coating backup roller 3, is configured to be enlarged and shown in cross section in FIG. .
【００２９】すなわち、塗工液収容ホッパー４は、塗工
バックアップローラ３周面に沿って搬送されるシート状
電極基材２面を底面とする角筒型に形成されており、か
つシート状電極基材２が搬送される下流側側壁4aの端面
が塗工膜厚調整スリットとして機能するするように、一
定のクリアランス８を採りながら、前記下流側側壁4aを
摺接可能にしてある。また、塗工液収容ホッパー４の側
壁、たとえばシート状電極基材２が搬送される上流側側
壁4b部には、塗工液（たとえばペースト状のリチウム電
池正極用の電極合剤）９の供給路4cが配設されている。That is, the coating liquid accommodating hopper 4 is formed in a rectangular tube shape with the bottom surface of the sheet-shaped electrode base material 2 conveyed along the peripheral surface of the coating backup roller 3, and the sheet-shaped electrode. The downstream side wall 4a can be slidably contacted with a certain clearance 8 so that the end surface of the downstream side wall 4a on which the substrate 2 is conveyed functions as a coating film thickness adjusting slit. Further, a coating liquid (for example, a paste-like electrode mixture for a positive electrode of a lithium battery) 9 is supplied to a side wall of the coating liquid storage hopper 4, for example, an upstream side wall 4b where the sheet-shaped electrode base material 2 is conveyed. A path 4c is provided.
【００３０】さらに、10は前記塗工液収容ホッパー４内
に収納され、塗工液９面に浮上する浮上型フロート、11
は前記浮上型フロート10の上方に対向して支持体12で支
持・配置され、浮上型フロート10の浮上位置の変位を非
接触に測定する浮上位置測定手段である。ここで、浮上
型フロート10は、たとえばポリエチレン樹脂製の有底容
器であり、フロートガイド12によって上下方向に自由に
移動できるように装着されている。 また、浮上位置測
定手段11は、前記浮上型フロート10面における超音波の
反射、もしくはレーザー光線の反射などを利用して、浮
上型フロート10と超音波発振器（レーザー光源）との距
離を測定し、結果的に、浮上型フロート10の位置（塗工
液９面）の変位、すなわち塗工液収容ホッパー４内塗工
液（電極合剤）９の量を検出する構成となっている。Further, 10 is a floating float which is accommodated in the coating liquid accommodating hopper 4 and floats on the surface of the coating liquid 9, 11
Is a floating position measuring means which is supported and arranged above the floating float 10 by a support 12 and which measures the displacement of the floating position of the floating float 10 in a non-contact manner. The floating float 10 is a bottomed container made of polyethylene resin, for example, and is mounted by a float guide 12 so as to be freely movable in the vertical direction. Further, the floating position measuring means 11 measures the distance between the floating float 10 and the ultrasonic oscillator (laser light source) by utilizing the reflection of ultrasonic waves on the surface of the floating float 10 or the reflection of a laser beam, As a result, the displacement of the position of the floating float 10 (the surface of the coating liquid 9), that is, the amount of the coating liquid (electrode mixture) 9 in the coating liquid storage hopper 4 is detected.
【００３１】なお、13は前記浮上位置測定手段11の演算
部、14は前記演算部13の演算結果に基づいて、塗工液収
容ホッパー４内の塗工液９の補充などを指示する指示機
構で、この指示機構14を塗工液９の供給ポンプ15と連接
しておけば、前記塗工液収容ホッパー４内の塗工液９面
（塗工液９量）の変化に連動して塗工液９の補充が成さ
れる。Reference numeral 13 is an arithmetic unit of the flying position measuring means 11, and 14 is an instruction mechanism for instructing replenishment of the coating liquid 9 in the coating liquid storage hopper 4 based on the arithmetic result of the arithmetic unit 13. If the indicating mechanism 14 is connected to the supply pump 15 for the coating liquid 9, the coating liquid 9 in the coating liquid accommodating hopper 4 (the amount of the coating liquid 9) is changed in association with the change. The working fluid 9 is replenished.
【００３２】次に、上記構成の塗工液塗布装置の動作の
概略を説明する。Next, an outline of the operation of the coating liquid coating apparatus having the above-mentioned structure will be described.
【００３３】回転する塗工バックアップローラ３の周面
に密着して、シート状の電極基材２を連続的に2m／min.
の速さ（塗布速度）で走行させる一方、塗工液収容ホッ
パー４内に、ペースト状の塗工液（電極合剤）９を供給
する。そして、塗工バックアップロール３の周面に沿っ
て搬送（走行）するシート状の電極基材２は、塗工液収
容ホッパー４を通過するとき、その電極基材２面に塗工
液（電極合剤）９が塗着され、塗工液厚調整スリット4a
によって塗布膜の厚さが調節される。この塗布膜厚が調
節された電極基材２は、乾燥炉５を通過する段階で塗布
膜が乾燥されて巻き取りローラ７に巻き取られる。The sheet-shaped electrode base material 2 is continuously adhered to the peripheral surface of the rotating coating backup roller 3 at 2 m / min.
While traveling at the speed (application speed), a paste-like coating solution (electrode mixture) 9 is supplied into the coating solution accommodating hopper 4. Then, the sheet-shaped electrode base material 2 conveyed (running) along the peripheral surface of the coating backup roll 3 passes through the coating liquid storage hopper 4, and the coating liquid (electrode (Mixture) 9 is applied, and coating liquid thickness adjusting slit 4a
The thickness of the coating film is adjusted by. The electrode base material 2 whose coating film thickness is adjusted is dried at the stage of passing through the drying furnace 5 and is wound around the winding roller 7.
【００３４】前記塗工液の塗布に伴って、塗工液収容ホ
ッパー４内の塗工液９が消費され、塗工液収容ホッパー
４内の塗工液９面が低下すると、この塗工液９面が低下
に応じて浮上型フロート10が低下するので、前記浮上位
置測定手段11（センサ）と浮上型フロート10との距離が
増加する。この距離増加に伴った信号が演算部13に送ら
れ、予め設定しておいた閾値を超えた場合は、塗工液９
の補充が指示機構14から出され、この指示に基づいて供
給ポンプ15を動作させて塗工液９の補充がなされる。When the coating liquid 9 in the coating liquid accommodating hopper 4 is consumed along with the application of the coating liquid and the surface of the coating liquid 9 in the coating liquid accommodating hopper 4 is lowered, this coating liquid 9 Since the floating float 10 is lowered in accordance with the decrease of the nine surfaces, the distance between the floating position measuring means 11 (sensor) and the floating float 10 is increased. A signal accompanying this increase in distance is sent to the calculation unit 13, and when the signal exceeds a preset threshold value, the coating liquid 9
Is supplied from the instruction mechanism 14, and the supply pump 15 is operated based on this instruction to replenish the coating liquid 9.
【００３５】前記供給ポンプ15の動作によって、塗工液
収容ホッパー４内に塗工液９が補充されると、塗工液９
面が上昇するので、この塗工液９面の上昇に伴って浮上
型フロート10が上昇する。したがって、前記浮上位置測
定手段11（センサ）と浮上型フロート10との距離が減少
し、この距離減少に伴った信号が演算部13に送られ、予
め設定しておいた閾値を超えた場合は、塗工液９の補充
呈しが指示機構14から出され、この指示に基づいて供給
ポンプ15の動作が停止され、塗工液９の供給・補充が止
められる。When the coating liquid containing hopper 4 is replenished with the coating liquid 9 by the operation of the supply pump 15, the coating liquid 9
Since the surface rises, the floating float 10 rises as the surface of the coating liquid 9 rises. Therefore, when the distance between the flying position measuring means 11 (sensor) and the floating float 10 decreases, a signal accompanying this decrease in distance is sent to the calculation unit 13, and when a preset threshold value is exceeded, The indication mechanism 14 issues a replenishment presentation of the coating liquid 9, and the operation of the supply pump 15 is stopped based on this indication, so that the supply / replenishment of the coating liquid 9 is stopped.
【００３６】このように、塗工液収容ホッパー４内の塗
工液９量が、予め設定された一定の範囲内で維持される
ため、塗工バックアップローラ３の周面に沿って搬送・
走行するシート状の電極基材２面に対する塗工液９圧も
ほぼ一定となり、所望膜厚で、かつ膜厚のバラツキもな
い電極合剤膜を有する高品質なシート状電極を製造する
ことができる。As described above, since the amount of the coating liquid 9 in the coating liquid storage hopper 4 is maintained within a preset constant range, it is conveyed along the peripheral surface of the coating backup roller 3.
The pressure of the coating liquid 9 on the surface of the running sheet-shaped electrode base material 2 becomes substantially constant, and a high-quality sheet-shaped electrode having a desired film thickness and an electrode mixture film having no film thickness variation can be manufactured. it can.
【００３７】なお、本発明は、上記実施例に限定される
ものでなく、発明の趣旨を逸脱しない範囲でいろいろの
変形を採ることができる。すなわちペースト状のリチウ
ム電池正極用の電極合剤の代りに、ペースト状のリチウ
ム電池負極用の電極合剤、ニッケル水素電池用の電極合
剤を塗工する場合などにも適用できる。The present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. That is, the present invention can be applied to the case of applying a paste-like electrode mixture for a negative electrode of a lithium battery or a paste-like electrode mixture for a nickel-hydrogen battery instead of the electrode mixture for a positive electrode of a lithium battery.
【００３８】[0038]
【発明の効果】上記説明から分かるように、請求項１お
よび請求項２の発明によれば、シート状の電極基材面に
塗布する塗工液（電極合剤）の粘度が低くても、その影
響を受けずに、一定の膜厚に制御された塗布膜を容易に
形成することができる。すなわち、塗工液収容ホッパー
４内の塗工液量が一定の範囲内に保たれるため、塗工バ
ックアップロール３の周面に沿って搬送・走行するシー
ト状の電極基材面に対して、常時、ほぼ一定の塗工液圧
が加わることになる。したがって、塗工液収容ホッパー
４内を通過する段階、膜厚調整スリットを通過するとき
も、常に、ほぼ一定の圧力が印加された状態となり、結
果的に、所定の塗布膜厚に制御されるとともに、塗布膜
厚のバラツキも解消され、高品質のシート状電極を歩留
まりよく提供できる。As can be seen from the above description, according to the inventions of claims 1 and 2, even if the viscosity of the coating liquid (electrode mixture) applied to the sheet-shaped electrode base material surface is low, It is possible to easily form a coating film whose thickness is controlled without being affected by the influence. That is, since the amount of the coating liquid in the coating liquid accommodating hopper 4 is maintained within a certain range, the sheet-shaped electrode base material surface that is conveyed / run along the peripheral surface of the coating backup roll 3 Therefore, a constant coating liquid pressure is always applied. Therefore, even when passing through the coating liquid storage hopper 4 and when passing through the film thickness adjusting slit, a substantially constant pressure is always applied, and as a result, a predetermined coating film thickness is controlled. At the same time, variations in coating film thickness are eliminated, and high-quality sheet-shaped electrodes can be provided with high yield.
【図１】実施例に係るシート状電極基材用塗工液の塗工
装置の概略構成を示すブロック図。FIG. 1 is a block diagram showing a schematic configuration of a coating apparatus for a sheet-shaped electrode base material coating solution according to an embodiment.
【図２】実施例に係るシート状電極基材用塗工液の塗工
装置の要部構成を示す断面図。FIG. 2 is a cross-sectional view showing the main configuration of a coating apparatus for a sheet-shaped electrode base material coating liquid according to an embodiment.
１……シート状の電極基材の巻き戻しローラ ２……シート状の電極基材 ２′……塗工液膜付きシート状の電極基材 ３……塗工バックアップローラ ４……塗工液収容ホッパー 4a……塗工液膜厚調整スリット 4c……塗工液供給路 ５……トンネル型乾燥炉 ６……ガイドローラ ７……シート状の電極基材の巻き取りローラ ８……クリアランス ９……塗工液（電極合剤） 10……浮上型フロート 11……浮上型フロートの位置測定手段 12……支持体 13……演算部 14……塗工液の補充指示機構 1 ... Rewinding roller for sheet-shaped electrode base material 2 ... Sheet-shaped electrode base material 2 '... Sheet-shaped electrode base material with coating liquid film 3 ... Coating backup roller 4 ... Coating liquid storage hopper 4a …… Coating liquid film thickness adjustment slit 4c ... Coating liquid supply path 5 ... Tunnel type drying oven 6 ... Guide roller 7 ... Winding roller for sheet-shaped electrode base material 8: Clearance 9 ... Coating liquid (electrode mixture) 10 ... floating float 11 ... Measures for measuring the position of floating floats 12 ... Support 13 …… Calculator 14 ... Coating liquid replenishment instruction mechanism
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 4/04 H01M 4/02 H01M 4/26 Front page continuation (58) Fields surveyed (Int.Cl. 7 , DB name) H01M 4/04 H01M 4/02 H01M 4/26
Claims (2)
する塗工バックアップローラと、 前記塗工バックアップローラ周面に沿って搬送されるシ
ート状電極基材面を底面とする塗工液収容ホッパーと、 前記塗工液収容ホッパーのシート状電極基材下流側の端
面に摺接可能に配置された塗工膜厚調整スリットと、 前記塗工液収容ホッパー内に収納され、塗工液面に浮上
する浮上型フロートと、 前記浮上型フロートの浮上位置の変位を非接触に測定す
る浮上位置測定手段と、前記塗工液収容ホッパーに収容される塗工液の液面より
も下部の前記塗工液収容ホッパーの側壁に配設され、前
記浮上位置測定手段の測定結果に基づいて、供給ポンプ
により圧送された塗工液を前記塗工液収容ホッパー内に
供給する配管と を有することを特徴とするシート状電極
用の塗工液塗布装置。1. A coating backup roller that conveys a sheet-shaped electrode base material along a peripheral surface, and a coating that has a sheet-shaped electrode base material surface that is conveyed along the peripheral surface of the coating backup roller as a bottom surface. A liquid storage hopper, a coating film thickness adjusting slit arranged so as to be slidable on an end face of the coating liquid storage hopper on the downstream side of the sheet-shaped electrode base material, and stored in the coating liquid storage hopper for coating. A floating float that floats on the liquid surface, a floating position measuring unit that measures the displacement of the floating position of the floating float in a non-contact manner, and from the liquid surface of the coating liquid stored in the coating liquid storage hopper.
Is also installed on the side wall of the coating liquid storage hopper at the bottom,
Based on the measurement result of the floating position measuring means, the supply pump
The coating liquid pumped by the inside of the coating liquid storage hopper
A coating liquid application device for a sheet electrode , comprising: a supply pipe .
する塗工バックアップローラと、 前記塗工バックアップローラ周面に沿って搬送されるシ
ート状電極基材面を底面とする塗工液収容ホッパーと、 前記塗工液収容ホッパーのシート状電極基材下流側の端
面に摺接可能に配置された塗工膜厚調整スリットと、 前記塗工液収容ホッパー内に収納され、塗工液面に浮上
する浮上型フロートと、 前記浮上型フロートの浮上位置の変位を非接触に測定す
る浮上位置測定手段と、 前記浮上型フロートの浮上位置の変位に応じて、塗工液
収容ホッパー内への塗工液供給を指示する塗工液供給指
示手段と、前記塗工液収容ホッパーに収容される塗工液の液面より
も下部の前記塗工液収容ホッパーの側壁に配設され、前
記塗工液供給指示手段の指示に基づいて、供給 ポンプに
より圧送された塗工液を前記塗工液収容ホッパー内に供
給する配管と を有することを特徴とするシート状電極用
の塗工液塗布装置。2. A coating backup roller that conveys a sheet-shaped electrode base material along a peripheral surface, and a coating that has a sheet-shaped electrode base material surface that is conveyed along the peripheral surface of the coating backup roller as a bottom surface. A liquid storage hopper, a coating film thickness adjusting slit arranged so as to be slidable on an end face of the coating liquid storage hopper on the downstream side of the sheet-shaped electrode base material, and stored in the coating liquid storage hopper for coating. A floating float that floats on the liquid surface, a floating position measuring means that measures the displacement of the floating position of the floating float in a non-contact manner, and according to the displacement of the floating position of the floating float, in the coating liquid storage hopper From the liquid level of the coating liquid stored in the coating liquid storing hopper
Is also installed on the side wall of the coating liquid storage hopper at the bottom,
Based on the instruction of the coating liquid supply instruction means ,
The more pumped coating liquid is supplied to the coating liquid storage hopper.
A coating liquid application device for a sheet electrode , comprising: a supply pipe .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25526097A JP3466436B2 (en) | 1997-09-19 | 1997-09-19 | Coating liquid coating device for sheet electrodes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25526097A JP3466436B2 (en) | 1997-09-19 | 1997-09-19 | Coating liquid coating device for sheet electrodes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1196997A JPH1196997A (en) | 1999-04-09 |
| JP3466436B2 true JP3466436B2 (en) | 2003-11-10 |
Family
ID=17276284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25526097A Expired - Fee Related JP3466436B2 (en) | 1997-09-19 | 1997-09-19 | Coating liquid coating device for sheet electrodes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3466436B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101537386B1 (en) * | 2013-12-26 | 2015-07-17 | 주식회사 포스코 | Device for manufacturing coating electrode for secondary battery |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5552447B2 (en) | 2011-01-25 | 2014-07-16 | トヨタ自動車株式会社 | Ultrasonic measurement method and ultrasonic measurement apparatus |
-
1997
- 1997-09-19 JP JP25526097A patent/JP3466436B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101537386B1 (en) * | 2013-12-26 | 2015-07-17 | 주식회사 포스코 | Device for manufacturing coating electrode for secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1196997A (en) | 1999-04-09 |
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