JP2001079476A - Coating device - Google Patents
Coating deviceInfo
- Publication number
- JP2001079476A JP2001079476A JP26398699A JP26398699A JP2001079476A JP 2001079476 A JP2001079476 A JP 2001079476A JP 26398699 A JP26398699 A JP 26398699A JP 26398699 A JP26398699 A JP 26398699A JP 2001079476 A JP2001079476 A JP 2001079476A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- slit nozzle
- strip
- coating liquid
- belt
- 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.)
- Pending
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
- Coating Apparatus (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、帯状の部材の表面に連
続的に一様な厚さの塗布層を形成するスリットノズルか
ら塗布液を連続的に流出させて塗布層を形成する装置に
関し、特に連続的に走行する帯状の集電体上に液状の活
物質を塗布して均一な厚さの活物質層を形成する装置に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for forming a coating layer by continuously flowing a coating liquid from a slit nozzle for forming a coating layer having a uniform thickness on the surface of a belt-shaped member. More particularly, the present invention relates to an apparatus for applying a liquid active material on a continuously running belt-shaped current collector to form an active material layer having a uniform thickness.
【０００２】[0002]
【従来の技術】小型の電子機器用の電源として用いられ
る電池として小型で大容量であるリチウムイオン二次電
池等の非水電解液電池が用いられている。リチウムイオ
ン二次電池は、一般には、アルミニウム箔からなる帯状
の正極集電体に正極活物質を塗布した正極、および銅箔
からなる帯状の負極集電体に負極活物質を塗布した負極
をセパレータを介して積層したものを多数回巻回して作
製した電池要素を電池缶に収納し、電解液を注入した後
に封口することによって製造している。2. Description of the Related Art A non-aqueous electrolyte battery such as a lithium ion secondary battery having a small capacity and a large capacity is used as a battery used as a power source for a small electronic device. Lithium ion secondary batteries are generally composed of a positive electrode in which a positive electrode active material is applied to a band-shaped positive electrode current collector made of aluminum foil, and a negative electrode in which a negative electrode active material is applied to a band-shaped negative electrode current collector made of copper foil. The battery element is manufactured by winding a battery element obtained by winding a large number of layers through a battery can into a battery can, injecting an electrolyte, and sealing the battery.
【０００３】帯状の集電体への電極活物質の塗布には、
各種の方法が採用されているが、連続走行する帯状の部
材へ電極活物質を液体中に分散したスラリーをスリット
状のノズルから流出させる方法が知られている。[0003] For the application of the electrode active material to the belt-like current collector,
Various methods have been adopted, and a method is known in which a slurry in which an electrode active material is dispersed in a liquid is caused to flow out of a slit-shaped nozzle into a continuously running belt-shaped member.
【０００４】図２は、従来のスリットノズルを用いた塗
布装置を説明する図であり、図２（Ａ）は、一部破断側
面図を示し、図２（Ｂ）は、図２（Ａ）においてＡ−Ａ
線の断面図である。スリットノズルを用いた塗布装置１
において、帯状部材２はバックアップロール３に巻きつ
けられながら走行し、スリットノズル４から加圧された
塗布液５が押し出されて帯状部材２の表面に所望の厚さ
の塗膜６が形成される。ところが、スリットノズルに供
給する塗布液５を一定の圧力として供給した場合であっ
ても、塗膜６の両端部分には、盛り上がり部分７が形成
される。FIG. 2 is a view for explaining a coating apparatus using a conventional slit nozzle. FIG. 2 (A) shows a partially cutaway side view, and FIG. 2 (B) shows FIG. 2 (A). In the AA
It is sectional drawing of a line. Coating device 1 using slit nozzle
In the above, the belt-like member 2 travels while being wound around the backup roll 3, and the pressurized coating liquid 5 is extruded from the slit nozzle 4 to form a coating film 6 having a desired thickness on the surface of the belt-like member 2. . However, even when the coating liquid 5 to be supplied to the slit nozzle is supplied at a constant pressure, raised portions 7 are formed at both ends of the coating film 6.
【０００５】電極活物質の塗膜の形成後に電極は乾燥さ
れ、更に電極はロールによって圧縮処理されるが、乾燥
後の圧縮処理によっても両端部の盛り上がり部分は、中
央部と同様の厚さになることはなく、このようなものを
用いると、電池要素の巻回体に割れが生じたり、電池缶
内に入らなくなるという問題点があった。[0005] After the electrode active material coating film is formed, the electrode is dried, and the electrode is compressed by a roll. However, even after the drying, the raised portions at both ends have the same thickness as the central portion. When such a material is used, there is a problem that the wound body of the battery element is cracked or cannot enter the battery can.
【０００６】一方、スリットノズルの開口部の大きさを
帯状部材の横幅よりも広幅で塗布すると、塗布液の粘度
が大きいので帯状部材の裏面に塗布材が回り込む現象が
生じて反対面に塗布液が付着するので、反対側を塗布す
る場合には、回り込んだ部分が飛び出したり、あるいは
既に裏面に塗膜が形成されている場合には、塗膜面に厚
さの厚い部分が生じる等の問題があった。このように帯
状体の幅方向の端部に盛り上がった部分が生じると巻回
して電池要素を作製した場合に活物質層に割れを生じた
り、あるいは電池缶内に入らなくなるという問題点が生
じていた。On the other hand, if the size of the opening of the slit nozzle is wider than the width of the band-shaped member, the viscosity of the coating solution is so large that the coating material wraps around the back surface of the band-shaped member, and the coating solution spreads on the opposite surface. When the opposite side is applied, the wraparound part jumps out, or when the coating is already formed on the back surface, a thick part occurs on the coating surface. There was a problem. When a raised portion is formed at the end in the width direction of the belt-like body, a problem arises in that when the battery element is wound, the active material layer is cracked or cannot enter the battery can. Was.
【０００７】[0007]
【発明が解決しようとする課題】本発明は、連続して走
行する帯状の部材に一様な厚さの塗膜を形成する塗布装
置において、帯状体の幅方向の端部の近傍に盛り上がり
部がなく、一様な厚みの塗膜を容易に得ることが可能な
塗布装置を提供することを課題とするものであり、電池
の活物質の塗布装置として使用した場合には、活物質層
の厚みが均一な活物質層の製造が可能な塗布装置を提供
することを課題とするものである。SUMMARY OF THE INVENTION An object of the present invention is to provide a coating apparatus for forming a coating film having a uniform thickness on a continuously running belt-like member. It is an object of the present invention to provide a coating apparatus capable of easily obtaining a coating film having a uniform thickness without using the same. An object of the present invention is to provide a coating apparatus capable of manufacturing an active material layer having a uniform thickness.
【０００８】[0008]
【課題を解決するための手段】本発明は、走行する帯状
部材にスリットノズルを対向配置し、帯状部材の幅方向
に開口したスリットノズルから帯状部材に塗布液を流出
させて塗膜を形成する塗布装置において、帯状部材の幅
よりも広い開口部を有するスリットノズルを有し、スリ
ットノズルの下方の帯状部材の塗布面と反対側の面に
は、上部の幅が帯状部材の幅と同じであり、下部の幅が
帯状部材の幅よりも小さな塗布液回り込み防止部材を有
し、帯状部材の下方に余剰塗布液回収手段を設けた塗布
装置である。また、スラリー状の活物質層形成用組成物
を塗布液として帯状の集電体上に塗布する電池の活物質
層の作製用の前記の塗布装置であるAccording to the present invention, a slit nozzle is arranged to face a traveling belt-like member, and a coating liquid is discharged from the slit nozzle opened in the width direction of the belt-like member to the belt-like member to form a coating film. The coating apparatus has a slit nozzle having an opening that is wider than the width of the band-shaped member. On the surface opposite to the coating surface of the band-shaped member below the slit nozzle, the upper width is the same as the width of the band-shaped member. The coating apparatus includes a coating liquid spill-prevention member having a lower width smaller than the width of the band-shaped member, and an excess coating liquid collecting unit provided below the band-shaped member. Further, the above-mentioned coating apparatus for producing an active material layer of a battery, wherein the slurry-like active material layer forming composition is applied as a coating liquid on a belt-shaped current collector.
【発明の実施の形態】図面を参照して本発明を説明す
る。図１は、本発明のスリットノズルを用いた塗布装置
を説明する図であり、図１（Ａ）は、一部破断側面図を
示し、図１（Ｂ）は、図１（Ａ）においてＡ−Ａ線の断
面図である。スリットノズルを用いた塗布装置１におい
て、帯状部材２はバックアップロール３に巻きつけられ
ながら走行し、スリットノズル４から加圧された塗布液
５が押し出されて帯状部材２の表面に所望の厚さの塗膜
６が形成される。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a view for explaining a coating apparatus using a slit nozzle of the present invention. FIG. 1 (A) shows a partially cutaway side view, and FIG. 1 (B) shows A in FIG. 1 (A). It is sectional drawing of the -A line. In the coating apparatus 1 using the slit nozzle, the belt-shaped member 2 travels while being wound around the backup roll 3, and the pressurized coating liquid 5 is extruded from the slit nozzle 4 to a desired thickness on the surface of the belt-shaped member 2. Is formed.
【０００９】スリットノズル４の開口部の幅方向の大き
さは、帯状部材２の幅方向の大きさに比べて大きいの
で、帯状部材の端部にも盛り上がり現象等は生ぜずに均
一な塗膜６が形成されるとともに、帯状部材の横幅を越
えた部分を余剰の塗布液が流下する。帯状部材２の下部
には、上部の幅が帯状部材の幅と同じであり、下部の幅
が帯状部材の幅よりも小さな塗布液回り込み防止部材８
が、帯状部材にほぼ接するように設けられているので、
帯状部材の下面９には塗布液が回り込むことはない。塗
布液回り込み防止部材８の側面の傾斜角度は、底部の水
平面に対して１００〜１３０°の角度を有し、塗布液に
含まれる有機溶剤等に対して腐食されることがないステ
ンレス等の金属材料を用いることができる。また、帯状
部材を越えて延びたスリットノズルの開口部から流下し
た塗布液５は、塗布液回り込み防止部材８の側面を流下
して、余剰塗布液回収手段１０によって回収されて、再
度成分が調製されて再利用される。Since the size of the opening of the slit nozzle 4 in the width direction is larger than the size of the band member 2 in the width direction, a uniform coating film does not occur at the end of the band member without swelling. 6 is formed, and excess coating solution flows down over the width of the band-shaped member. In the lower part of the belt-like member 2, the upper part width is the same as the width of the belt-like member, and the lower part width is smaller than the width of the belt-like member.
Is provided so as to be almost in contact with the belt-shaped member,
The coating liquid does not flow around the lower surface 9 of the belt-shaped member. The inclination angle of the side surface of the coating liquid spill prevention member 8 has an angle of 100 to 130 ° with respect to the horizontal plane at the bottom, and is made of metal such as stainless steel which is not corroded by an organic solvent or the like contained in the coating liquid. Materials can be used. Further, the coating liquid 5 flowing down from the opening of the slit nozzle extending beyond the belt-shaped member flows down the side surface of the coating liquid spill prevention member 8 and is collected by the surplus coating liquid collecting means 10 to prepare the component again. Being reused.
【００１０】リチウムイオン二次電池の正極電極および
負極電極の製造の場合を例に挙げて説明すると、正極電
極は帯状のアルミニウム箔に、ＬｉxＭＯ2（ただしＭ
は、少なくとも１の遷移金属を表す。）である複合酸化
物、例えば、ＬｉxＣｏＯ2、ＬｉxＮｉＯ2、ＬｉxＭｎ2
Ｏ4、ＬｉxＭｎＯ3、ＬｉxＮｉyＣｏ(1-y)Ｏ2などを 、
カーボンブラック等の導電性物質、ポリフッ化ビニリデ
ン（ＰＶＤＦ）等の結着剤をＮ−メチル−２−ピロリド
ン（ＮＭＰ）等の溶剤とを分散混練した調製した正極塗
料が本発明の塗布装置によって塗布される。片面の塗布
が終わったものは乾燥後に反対面も同様に塗布し、両面
を塗布される。[0010] The case of manufacturing a positive electrode and a negative electrode of a lithium ion secondary battery will be described as an example. The positive electrode is formed on a strip-shaped aluminum foil, and Li x MO 2 (M
Represents at least one transition metal. ), Such as Li x CoO 2 , Li x NiO 2 , and Li x Mn 2
O 4 , Li x MnO 3 , Li x Ni y Co (1-y ) O 2, etc.
A positive electrode paint prepared by dispersing and kneading a conductive substance such as carbon black and a binder such as polyvinylidene fluoride (PVDF) with a solvent such as N-methyl-2-pyrrolidone (NMP) is applied by the coating apparatus of the present invention. Is done. After the coating on one side is completed, the opposite side is similarly coated after drying, and both sides are coated.
【００１１】負極電極は、帯状の銅箔等の表面に、リチ
ウムをドープ及び脱ドープ可能な、熱分解炭素類、ピッ
チコークス、ニードルコークス、石油コークスなどのコ
ークス類、グラファイト類、ガラス状炭素類、フェノー
ル樹脂、フラン樹脂などを焼成した有機高分子化合物焼
成体、炭素繊維、活性炭などの炭素質材料、ポリアセチ
レン、ポリピロール等の導電性高分子材料、あるいは金
属リチウム、リチウム−アルミ合金等のリチウム合金を
カーボンブラックなどの導電性物質、ポリフッ化ビニリ
デン（ＰＶＤＦ）等の結着剤をＮ−メチル−２−ピロリ
ドン（ＮＭＰ）等の溶剤とを分散混練した調製した負極
塗布液を本発明の塗布装置によって塗布される。片面の
塗布が終わったものは乾燥後に反対面も同様に塗布し、
両面を塗布される。なお、負極電極にあっては、巻回し
て電池要素を作製した場合に片面が正極活物質層に対向
しない部分にあっては、片面のみに負極活物質層を形成
しても良い。The negative electrode is made of pyrolytic carbon, pitch coke, needle coke, coke such as petroleum coke, graphite, glassy carbon and the like, which can be doped and dedoped with lithium on the surface of a strip-shaped copper foil or the like. , Phenolic resin, fired organic polymer compound fired furan resin, carbon fiber, carbonaceous material such as activated carbon, conductive polymer material such as polyacetylene, polypyrrole, or lithium alloy such as lithium metal, lithium-aluminum alloy A negative electrode coating solution prepared by dispersing and kneading a conductive material such as carbon black and a binder such as polyvinylidene fluoride (PVDF) with a solvent such as N-methyl-2-pyrrolidone (NMP) is applied to the coating apparatus of the present invention. Applied by After drying on one side, apply the other side in the same way after drying,
Both sides are applied. In the case where the negative electrode is wound and a battery element is manufactured, if one surface is not opposed to the positive electrode active material layer, the negative electrode active material layer may be formed only on one surface.
【００１２】このようにして得られた正極電極、負極電
極は、電極を所定の厚みに圧縮して圧縮した後に、裁断
装置によって電極を所定の形状に裁断し、導電タブを接
合した後に、セパレータを介して積層したものを巻回し
電池要素を作製し、電池缶に収納して、非水電解液を注
入した後に、外部接続端子、電池内圧の上昇によって圧
力を開放する安全弁、電池温度の上昇により電気抵抗の
増大で電流を遮断するＰＴＣ素子等を備えた蓋体を取り
付けて封口することによって密閉型電池を製造する。[0012] The positive electrode and the negative electrode thus obtained are compressed into a predetermined thickness, and then cut into a predetermined shape by a cutting device. A battery element is manufactured by winding the laminated body through a battery pack, housed in a battery can, injected with a non-aqueous electrolyte, and then connected to an external connection terminal, a safety valve that releases pressure by increasing internal battery pressure, and an increase in battery temperature. A sealed battery is manufactured by attaching and closing a lid provided with a PTC element or the like that interrupts current by increasing electric resistance.
【００１３】[0013]
【発明の効果】本発明の塗布装置によれば、走行する帯
状の基材上に、下面への回り込みを防止した状態で、幅
方向の端部に盛り上がり部が生じることなく均一な厚さ
の塗膜を形成することができるので、電池活物質の塗布
装置として利用した場合には、電池特性の良好な電池を
製造することができる。また、余剰塗布液回収手段を設
けたので、帯状部材に塗布されなかった余剰塗布液を回
収して再利用することができる。According to the coating apparatus of the present invention, a uniform thickness can be obtained on the running belt-like base material without any protruding portion at the end in the width direction in a state in which the running to the lower surface is prevented. Since a coating film can be formed, a battery having good battery characteristics can be manufactured when used as a device for applying a battery active material. Further, since the surplus coating liquid collecting means is provided, the surplus coating liquid not applied to the belt-shaped member can be collected and reused.
【図１】図１は、本発明のスリットノズルを用いた塗布
装置を説明する図である。FIG. 1 is a diagram illustrating a coating apparatus using a slit nozzle of the present invention.
【図２】図２は、従来のスリットノズルを用いた塗布装
置を説明する図である。FIG. 2 is a diagram illustrating a coating apparatus using a conventional slit nozzle.
１…塗布装置、２…帯状部材、３…バックアップロー
ル、４…スリットノズル、５…塗布液、６…塗膜、７…
盛り上がり部分、８…塗布液回り込み防止部材、９…下
面、１０…余剰塗布液回収手段REFERENCE SIGNS LIST 1 coating device 2 band member 3 backup roll 4 slit nozzle 5 coating solution 6 coating film 7
Rising part, 8: coating liquid spill-prevention member, 9: lower surface, 10: surplus coating liquid collecting means
Claims (1)
向配置し、帯状部材の幅方向に開口したスリットノズル
から帯状部材に塗布液を流出させて塗膜を形成する塗布
装置において、帯状部材の幅よりも広い開口部を有する
スリットノズルを有し、スリットノズルの下方の帯状部
材の塗布面と反対側の面には、上部の幅が帯状部材の幅
と同じであり、下部の幅が帯状部材の幅よりも小さな塗
布液回り込み防止部材を有し、帯状部材の下方に余剰塗
布液回収手段を設けたことを特徴とする塗布装置。1. A coating apparatus in which a slit nozzle is arranged to face a running belt-like member and a coating liquid is discharged from the slit nozzle opened in the width direction of the belt-like member to the belt-like member to form a coating film. It has a slit nozzle having an opening wider than the slit nozzle, on the surface opposite to the application surface of the band member below the slit nozzle, the upper width is the same as the width of the band member, the lower width is the band member A coating liquid circulating prevention member having a width smaller than the width of the coating liquid, and an excess coating liquid collecting means provided below the belt-shaped member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26398699A JP2001079476A (en) | 1999-09-17 | 1999-09-17 | Coating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26398699A JP2001079476A (en) | 1999-09-17 | 1999-09-17 | Coating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001079476A true JP2001079476A (en) | 2001-03-27 |
Family
ID=17396963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26398699A Pending JP2001079476A (en) | 1999-09-17 | 1999-09-17 | Coating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001079476A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100742529B1 (en) * | 2005-12-07 | 2007-07-25 | 한국전기연구원 | Pitch Blade, Manufacturing Method of Electrode Thereby And Lithium Secondary Battery |
| JP2013233511A (en) * | 2012-05-09 | 2013-11-21 | Furukawa Electric Co Ltd:The | Coating film material application apparatus and method of applying coating film material to long member |
-
1999
- 1999-09-17 JP JP26398699A patent/JP2001079476A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100742529B1 (en) * | 2005-12-07 | 2007-07-25 | 한국전기연구원 | Pitch Blade, Manufacturing Method of Electrode Thereby And Lithium Secondary Battery |
| JP2013233511A (en) * | 2012-05-09 | 2013-11-21 | Furukawa Electric Co Ltd:The | Coating film material application apparatus and method of applying coating film material to long member |
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