JP2011003365A - Manufacturing method of electrode plate - Google Patents
Manufacturing method of electrode plate Download PDFInfo
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- JP2011003365A JP2011003365A JP2009144796A JP2009144796A JP2011003365A JP 2011003365 A JP2011003365 A JP 2011003365A JP 2009144796 A JP2009144796 A JP 2009144796A JP 2009144796 A JP2009144796 A JP 2009144796A JP 2011003365 A JP2011003365 A JP 2011003365A
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- 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
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- 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
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
Description
本発明は電極板の製造方法に関し、特に連続的に走行する被塗布物の表面に間欠的に塗膜を形成する電極板の製造方法に関するものである。 The present invention relates to a method for manufacturing an electrode plate, and more particularly to a method for manufacturing an electrode plate in which a coating film is intermittently formed on the surface of an object to be continuously run.
従来、リチウムイオン二次電池、ニッケル水素二次電池、燃料電池等の電池電極の製造に、塗布ロールを用いる間欠塗工方法が使用されている。たとえば特許文献1に記載された間欠塗工方法では、図１１に示すように、貯留槽１０１からの塗料１０２を調厚ロール１０３と塗布ロール１０４との間を通過させることで該塗布ロール１０４表面に塗膜１０５が形成され、この塗膜１０５が、バックアップロール１０６に巻き掛けられて塗布ロール１０４に近接して走行している帯状の被塗布物１０７表面に転写される。この状態から、図１２に示すように、塗布ロール１０４と被塗布物１０７とが相対的に離間されることで、該被塗布物１０７上の塗膜１０５に塗布終端１０８が形成され、それに続く無地部１０９が被塗布物１０７に設けられる。このようにして、塗膜１０５が形成された塗布ロール１０４と被塗布物１０７との近接離間が繰り返されることで、被塗布物１０７にその走行方向に沿って間欠的に塗膜１０５が形成される。 Conventionally, an intermittent coating method using a coating roll has been used for manufacturing battery electrodes such as lithium ion secondary batteries, nickel metal hydride secondary batteries, and fuel cells. For example, in the intermittent coating method described in Patent Document 1, as shown in FIG. 11, the coating roll 104 surface is obtained by passing the coating material 102 from the storage tank 101 between the thickness adjusting roll 103 and the coating roll 104. A coating film 105 is formed on the film, and the coating film 105 is wound around the backup roll 106 and transferred onto the surface of the belt-like object 107 running close to the coating roll 104. From this state, as shown in FIG. 12, the coating roll 104 and the coating object 107 are relatively separated, whereby a coating terminal end 108 is formed on the coating film 105 on the coating object 107, and then. A plain part 109 is provided on the workpiece 107. In this manner, the coating roll 104 on which the coating film 105 is formed and the object 107 are repeatedly approached and separated, so that the coating film 105 is intermittently formed on the object 107 along the traveling direction. The
しかしながら、上記した従来の間欠塗工方法では、被塗布物１０７上に形成する個々の塗膜１０５の内、塗布ロール１０４と被塗布物１０７との近接離間に伴って塗布始端および塗布終端が形成されるときと、塗布ロール１０４と被塗布物１０７とが一定距離で対峙した状態で塗布始端および塗布終端から十分に離れた定常部分が形成されるときとで、塗布ロール１０４と被塗布物１０７との近接部分での流速分布が異なるため、塗布終端１０８および塗布始端１１０の近傍の塗膜１０５は、少なからず盛り上がるか、あるいは図示したように薄くなり、不均一な膜厚分布になるという問題がある。 However, in the above-described conventional intermittent coating method, among the individual coating films 105 formed on the coating object 107, the coating start end and the coating termination end are formed as the coating roll 104 and the coating object 107 come close to and away from each other. The coating roll 104 and the coating object 107 are formed in a state where the coating roll 104 and the coating object 107 are opposed to each other at a fixed distance, and a stationary portion sufficiently separated from the coating start end and the coating termination end is formed. Therefore, the coating film 105 in the vicinity of the coating end point 108 and the coating start point 110 rises to some extent or becomes thin as shown in the figure, resulting in a non-uniform film thickness distribution. There is.
また塗布終端１０８は塗膜１０５が引き伸ばされるようにして破断されるため完全な直線状にはならず、尾を引いたような塗料付着が生じるという問題がある。
本発明は、上記問題を解決するもので、塗膜の塗布始端から塗布終端に至るまでの膜厚の均一性に優れ、且つ塗布終端の直線性にも優れる電極板の製造方法を提供することを目的とする。
In addition, since the coating end point 108 is broken as the coating film 105 is stretched, the coating end point 108 is not completely linear, and there is a problem that the paint adheres like a tail.
The present invention solves the above problems and provides a method for producing an electrode plate that is excellent in film thickness uniformity from the coating start end to the coating end of the coating film and is excellent in the linearity of the coating end. With the goal.
上記課題を解決するために、本発明の電極板の製造方法は、第１ロールとそれに対向する第２ロールおよび第３ロールを配設し、前記第１ロールと前記第２ロールの間に電極塗料を通して前記第１ロールの表面に塗膜を形成し、この前記第１ロールの表面の塗膜を前記第３ロールの表面に沿って走行させる集電体の表面に転写して、前記集電体の表面に間欠的な電極塗膜を形成し電極板を製造する方法において、前記第１ロールの表面に形成され前記第１ロールの回転に伴って移動する前記塗膜に対して、前記第１ロールの軸方向に沿う切り込み部を前記第１ロールの回転方向に沿って所定間隔にて複数に形成するとともに、前記複数の切り込み部の内、任意の第１切り込み部が所定位置に到達した時に前記第１ロールと前記第３ロールとを互いに接近させ、前記第１切り込み部に後続する第２切り込み部が前記所定位置に到達した時に前記第１ロールと前記第３ロールとを互いに離間させることにより、前記第１切り込み部と前記第２切り込み部との間の前記塗膜を前記集電体の表面に転写することを特徴とする。 In order to solve the above-described problem, the electrode plate manufacturing method of the present invention includes a first roll, a second roll and a third roll facing each other, and an electrode between the first roll and the second roll. A coating film is formed on the surface of the first roll through the coating material, and the coating film on the surface of the first roll is transferred to the surface of a current collector that runs along the surface of the third roll. In the method of manufacturing an electrode plate by forming an intermittent electrode coating on the surface of the body, the first coating is formed on the surface of the first roll and moves with the rotation of the first roll. A plurality of cut portions along the axial direction of one roll are formed at predetermined intervals along the rotation direction of the first roll, and an arbitrary first cut portion among the plurality of cut portions has reached a predetermined position. Sometimes the first roll and the third roll And when the second cut portion following the first cut portion reaches the predetermined position, the first roll and the third roll are separated from each other, whereby the first cut portion and the first cut portion are separated from each other. The coating film between two cut portions is transferred to the surface of the current collector.
上記構成によれば、間欠的に転写された塗膜の各々は切り込み部を塗布始端および塗布終端とするため、流速分布の影響をほとんど受けず、塗布始端から塗布終端に至るまでの膜厚の均一性に優れ、塗布終端の破断も容易に起こるため直線性にも優れる。 According to the above configuration, since each of the intermittently transferred coatings has the incision portion as the application start end and application end, the film thickness from the application start end to the application end is almost unaffected by the flow velocity distribution. Excellent uniformity and excellent linearity due to easy breakage at the end of coating.
前記切り込み部の深さは前記塗膜の膜厚の１５％以上５０％未満であることが好ましい。前記塗膜を形成する塗料の粘度は２００Ｐａ・ｓ以上であることが好ましい。前記塗膜を形成する塗料が電池電極材料であるときに特に都合よい。 The depth of the cut portion is preferably 15% or more and less than 50% of the film thickness of the coating film. The viscosity of the coating material forming the coating film is preferably 200 Pa · s or more. It is particularly convenient when the coating material forming the coating film is a battery electrode material.
本発明の電極板の製造方法によれば、塗布始端から塗布終端に至るまで膜厚精度に優れる塗膜を形成することができ、塗布終端においても尾を引いたような塗料付着がない。かかる電極板の製造方法は、高い膜厚精度が要求される製品、たとえば、ニッケル水素二次電池、リチウムイオン二次電池、燃料電池などにおける電池電極の製造に適する。 According to the method for producing an electrode plate of the present invention, a coating film having excellent film thickness accuracy can be formed from the coating start end to the coating end, and there is no paint adhesion like a tail at the coating end. Such an electrode plate manufacturing method is suitable for manufacturing battery electrodes in products that require high film thickness accuracy, such as nickel metal hydride secondary batteries, lithium ion secondary batteries, and fuel cells.
以下、本発明の実施の形態について、図面を参照しながら説明する。
図１〜図４は本発明の一実施形態の電極板の製造方法を工程の順に示す断面模式図である。図１〜図４において、先の図１１および図１２と同じ構成要素については同じ符号を用いている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 are schematic cross-sectional views showing a method of manufacturing an electrode plate according to an embodiment of the present invention in the order of steps. 1 to 4, the same reference numerals are used for the same components as those in FIGS. 11 and 12.
図１に示す第1工程において、貯留槽１０１からの塗料１０２が回転している調厚ロール１０３と塗布ロール１０４との間を通過して該塗布ロール１０４表面に塗膜１０５が形成される。また塗布ロール１０４表面の塗膜１０５に、バックアップロール１０６に巻き掛けられて走行している帯状の被塗布物１０７が圧接されて、塗布ロール１０４表面の塗膜１０５が被塗布物１０７表面に転写される。調厚ロール１０３、塗布ロール１０４、バックアップロール１０６、被塗布物１０７はそれぞれ、特許請求の範囲における第１、第２、第３のロール、集電体に相当する。 In the first step shown in FIG. 1, the coating film 105 is formed on the surface of the coating roll 104 by passing between the thickness adjusting roll 103 and the coating roll 104 where the coating material 102 from the storage tank 101 is rotating. Further, the belt-like object 107 running around the backup roll 106 is pressed against the coating film 105 on the surface of the application roll 104, and the coating film 105 on the surface of the application roll 104 is transferred to the surface of the application object 107. Is done. The thickness adjusting roll 103, the application roll 104, the backup roll 106, and the coating object 107 correspond to the first, second, third roll, and current collector in the claims, respectively.
この際に、塗布ロール１０４とバックアップロール１０６とは、被塗布物１０７と塗布ロール１０４との間の最も小さい距離が塗布ロール１０４表面での塗膜１０５の塗布厚み以下となるまで相対的に近接させておく（この最も小さい距離で対向する被塗布物１０７と塗布ロール１０４の対向部どうしを結ぶ仮想平面の位置を転写位置と呼ぶこととする）。 At this time, the application roll 104 and the backup roll 106 are relatively close to each other until the smallest distance between the object 107 and the application roll 104 is equal to or less than the application thickness of the coating film 105 on the surface of the application roll 104. (The position of the virtual plane connecting the coating object 107 and the coating roll 104 facing each other at the smallest distance is referred to as a transfer position).
一方で、塗布ロール１０４表面に対してナイフ状の切り込み形成手段２０１を進退させることで、塗布ロール１０４表面の塗膜１０５に、塗膜１０５の幅方向（紙面と垂直な方向）に沿う塗布終端形成用の切り込み部２０２および塗布始端形成用の切り込み部２０３を該塗布ロール１０４の走行方向に沿って所定間隔にて形成する。切り込み形成手段２０１の形状については後述する。 On the other hand, the coating termination along the width direction of the coating film 105 (direction perpendicular to the paper surface) is caused to move to the coating film 105 on the surface of the coating roll 104 by moving the knife-shaped cut forming means 201 forward and backward with respect to the surface of the coating roll 104. A notch portion 202 for forming and a notch portion 203 for forming the coating start end are formed at predetermined intervals along the traveling direction of the coating roll 104. The shape of the notch forming means 201 will be described later.
次に、図２に示す第2工程において、第１工程で形成した切り込み部２０２が上述の転写位置に来たときに、塗布ロール１０４と被塗布物１０７とを相対的に離間させる。このことにより、塗膜１０５は切り込み部２０２部分で分離し、被塗布物１０７表面の塗膜１０５に切り込み部２０２の内面に相応する直線状の塗布終端１０８が形成され、それに続く無地部１０９が設けられる。 Next, in the second step shown in FIG. 2, when the cut portion 202 formed in the first step comes to the transfer position described above, the coating roll 104 and the coating object 107 are relatively separated from each other. As a result, the coating film 105 is separated at the cut portion 202 portion, and a linear coating terminal end 108 corresponding to the inner surface of the cut portion 202 is formed on the coating film 105 on the surface of the object 107 to be coated. Provided.
次に、図３に示す第３工程において、第1工程で形成した切り込み部２０３が上述の転写位置に来たときに、塗布ロール１０４と被塗布物１０７とを第１工程と同様に近接させる。このことにより、図４に示すように、塗布ロール１０４上で切り込み部２０３よりも塗布ロール１０４の回転方向の上流側にある塗膜１０５が被塗布物１０７の表面へ再び転写されていき、切り込み部２０３の内面を塗布始端１１０とした塗膜１０５が被塗布物１０７表面に形成される。 Next, in the third step shown in FIG. 3, when the cut portion 203 formed in the first step comes to the transfer position described above, the coating roll 104 and the coating object 107 are brought close to each other as in the first step. . As a result, as shown in FIG. 4, the coating film 105 located on the upstream side in the rotation direction of the coating roll 104 with respect to the cutting section 203 on the coating roll 104 is transferred again to the surface of the object 107 to be cut. A coating film 105 having the inner surface of the portion 203 as the coating start end 110 is formed on the surface of the article 107 to be coated.
以上のような塗布ロール１０４と被塗布物１０７との接近離間を繰り返すことにより、塗布ロール１０４表面に形成された塗膜１０５の必要部分だけを正確に切り出して被塗布物１０７の表面に転写させることができ、塗布始端１１０から塗布終端１０８に至るまで盛り上がりや薄塗りのない膜厚精度に優れた塗膜１０５を間欠的に形成することができる。 By repeating the approach and separation between the coating roll 104 and the coating object 107 as described above, only the necessary portion of the coating film 105 formed on the surface of the coating roll 104 is accurately cut out and transferred to the surface of the coating object 107. It is possible to intermittently form the coating film 105 excellent in film thickness accuracy without rising or thin coating from the coating start end 110 to the coating end point 108.
上述のナイフ状の切り込み形成手段２０１に代えて、図５に示すロール状の切り込み形成手段２１１を使用してもよい。この切り込み形成手段２１１は、刃２１２，２１３を所定の間隔で設けたもので、刃２１２，２１３が塗布ロール１０４表面の塗膜１０５に接触し、且つ刃２１２，２１３のない円筒面は塗膜１０５に接触しない寸法に形成したもので、塗布ロール１０４に対して適当距離に配置し、塗布ロール１０４と同方向に同速度で回転させることで、塗膜１０５に所定の間隔で切り込み部２０２，２０３を形成することができる。 Instead of the knife-like cut forming means 201 described above, a roll-shaped cut forming means 211 shown in FIG. 5 may be used. This incision forming means 211 is provided with blades 212 and 213 at predetermined intervals. The blades 212 and 213 are in contact with the coating film 105 on the surface of the coating roll 104, and the cylindrical surface without the blades 212 and 213 is a coating film. 105 is formed in a size that does not contact the coating roll 104, arranged at an appropriate distance from the coating roll 104, and rotated at the same speed in the same direction as the coating roll 104, so that the cut portions 202, 203 can be formed.
ただし、これらの切り込み形成手段２０１、２１１の形状や切り込み形成方法に限定されるものではなく、塗布ロール１０４表面の塗膜１０５に所定の間隔、所定の位置に切り込み部２０２，切り込み部２０３を形成できるものであればよい。 However, the shape of the incision forming means 201 and 211 and the incision forming method are not limited to the above, and the incision portion 202 and the incision portion 203 are formed in the coating film 105 on the surface of the coating roll 104 at predetermined intervals and at predetermined positions. Anything is possible.
ここで、切り込み部２０２，２０３は、塗布ロール１０４表面の塗膜１０５の厚みに対して１５％以上の深さとすることが望ましい。このことについて以下に説明する。
図６（ａ）に示すように、ベース２０４上に形成した塗膜１０５に対して、ナイフ状の切り込み形成手段２０１を図中の矢印の方向に出退させることで、所定深さまで挿入し引き抜いてＶ状の切り込み部２０２（あるいは２０３）を形成した。
Here, it is desirable that the notches 202 and 203 have a depth of 15% or more with respect to the thickness of the coating film 105 on the surface of the coating roll 104. This will be described below.
As shown in FIG. 6 (a), the knife-shaped notch forming means 201 is retracted and retracted in the direction of the arrow in the drawing with respect to the coating film 105 formed on the base 204, and is inserted and pulled out to a predetermined depth. Thus, a V-shaped cut portion 202 (or 203) was formed.
次に、図６（ｂ）（ｃ）に示すように、塗膜１０５の切り込み部２０２（２０３）を境とした片側の表面に被塗布物１０７を１ｋｇｆの荷重で矢印の方向に押し当て、しかる後に引き上げることにより、被塗布物１０７の表面へ塗膜１０５を転写させた。このときの塗膜端部の状態を確認した。 Next, as shown in FIGS. 6B and 6C, the object to be coated 107 is pressed in the direction of the arrow with a load of 1 kgf on the surface on one side of the cut portion 202 (203) of the coating film 105, Thereafter, the coating film 105 was transferred to the surface of the article 107 to be coated by pulling up. The state of the coating film edge part at this time was confirmed.
なお、ベース２０４は表面粗さＲｙが３μｍで厚み０．２mmのＳＵＳ板を用いた。塗膜１０５および被塗布物１０７は、リチウムイオン二次電池の電極に相応するものとした。つまり、被塗布物１０７は、表面粗さＲｙが０．１μｍで厚み１０μｍの銅箔を用いた。塗膜１０５は、リチウムイオン二次電池用負極合剤塗量（グラファイト１００ｇ、カルボキシルメチルセルロース２ｇ、水３８ｇ）を用いた。塗膜１０５の膜厚は１２０〜４９０μｍとし、切り込み部２０２（２０３）は２５μｍ〜１００μｍの深さとした。 As the base 204, a SUS plate having a surface roughness Ry of 3 μm and a thickness of 0.2 mm was used. The coating film 105 and the coating object 107 corresponded to the electrodes of the lithium ion secondary battery. That is, the coated object 107 was a copper foil having a surface roughness Ry of 0.1 μm and a thickness of 10 μm. As the coating film 105, a negative electrode mixture coating amount (100 g of graphite, 2 g of carboxymethyl cellulose, 38 g of water) for a lithium ion secondary battery was used. The film thickness of the coating film 105 was 120 to 490 μm, and the cut portion 202 (203) was 25 μm to 100 μm deep.
図６（ｃ）に示すように、切り込み部２０２（２０３）を境界として、紙面に垂直な方向の直線状の塗膜端部が形成された場合を正常と評価する。図６（ｄ）に示すように、ベース２０４上の塗膜１０５が切り込み部２０２（２０３）で分離されずに転写残りが生じ、被塗布物１０７上の塗膜１０５に欠けが生じた場合を不良と評価する。 As shown in FIG. 6 (c), the case where a linear coating film edge in a direction perpendicular to the paper surface is formed with the notch 202 (203) as a boundary is evaluated as normal. As shown in FIG. 6D, the case where the coating film 105 on the base 204 is not separated by the notch 202 (203) and a transfer residue is generated, and the coating film 105 on the object 107 is chipped. Evaluate as bad.
なお、切り込み形成手段２０１は、図７に拡大図示するように、任意の厚みの平板を任意の長さの部分において一端に向けて厚みが徐々に小さくなるように加工し、先端は所定の幅を持たせている。刃厚（平板の厚み）が１２０μｍ、刃長（厚みを減じた部分の長さ）が５００μｍ、刃先面取り長（先端の幅）が２０μｍのものを用いた。刃先面取り長がゼロであっても構わない。 In addition, as shown in an enlarged view in FIG. 7, the notch forming unit 201 processes a flat plate having an arbitrary thickness so that the thickness gradually decreases toward one end at a portion having an arbitrary length, and the tip has a predetermined width. Is given. A blade having a blade thickness (thickness of a flat plate) of 120 μm, a blade length (length of a portion obtained by reducing the thickness) of 500 μm, and a chamfering length (tip width) of 20 μm was used. The cutting edge chamfer length may be zero.
試験結果を図８に示す。正常は○印で表し、不良は×印で表す。図８から明らかなように、塗膜の膜厚に関わらず、膜厚の１５％以上の深さまで切り込み部を形成した場合に正常と評価されている。このことより、塗膜１０５に形成する切り込み部２０２（２０３）を膜厚の１５％以上の深さとすることで、切り込み部２０２（２０３）を境界として紙面と垂直な方向に直線状に塗膜端部を形成できると言える。 The test results are shown in FIG. Normal is represented by a circle, and defective is represented by a cross. As is apparent from FIG. 8, it is evaluated as normal when the cut portion is formed to a depth of 15% or more of the film thickness regardless of the film thickness of the coating film. Accordingly, the cut portion 202 (203) formed in the coating film 105 has a depth of 15% or more of the film thickness, and the coating film is linearly formed in a direction perpendicular to the paper surface with the cut portion 202 (203) as a boundary. It can be said that the end portion can be formed.
さらに、先に図１〜図４を用いて説明した方法により、つまり回転する塗布ロール１０４上の塗膜１０５に切り込み部２０２，２０３を形成して被塗布物１０７表面に転写することにより間欠的な塗膜１０５を形成し、その塗膜端部を調べた。 Further, by the method described above with reference to FIGS. 1 to 4, that is, by intermittently forming the cut portions 202 and 203 in the coating film 105 on the rotating coating roll 104 and transferring it to the surface of the coating object 107. The coating film 105 was formed, and the edge of the coating film was examined.
塗布ロール１０４は、外径２００ｍｍで表面粗さＲｙが３μｍのＳＵＳ製ロール（図６について説明したベース２０４と同様の表面である）を用いた。塗膜１０５は、図６について説明したのと同一の材料を用いて、膜厚２００μｍ、幅３００ｍｍにて形成し、塗布ロール１０４の回転によって速度３０ｍ／ｍｉｎで走行させた。切り込み形成手段２０１は、先の図７に示す形状で、刃厚が１２０μｍ、刃長が５００μｍ、刃先面取り長が２０μｍのものを使用した。被塗布物１０７は図６について説明したのと同様の銅箔である。 As the coating roll 104, an SUS roll having an outer diameter of 200 mm and a surface roughness Ry of 3 μm (the same surface as the base 204 described with reference to FIG. 6) was used. The coating film 105 was formed using the same material as described with reference to FIG. 6 with a film thickness of 200 μm and a width of 300 mm, and was run at a speed of 30 m / min by the rotation of the coating roll 104. The incision forming means 201 had the shape shown in FIG. 7, and had a blade thickness of 120 μm, a blade length of 500 μm, and a cutting edge chamfering length of 20 μm. The object 107 is a copper foil similar to that described with reference to FIG.
この結果、切り込み部２０２，２０３の深さが塗膜１０５の膜厚の５０％以上であるときに、図９に示すような、塗布終端１０８に塗膜１０５の欠けが生じる現象が見られた。これは、先の図１〜図４に示すように、塗膜１０５は回転する塗布ロール１０４に伴われて移動するので、塗膜１０５に対して完全なる垂直方向に切り込み形成手段２０１を出退させることができず、切り込み部２０２，２０３の深さが大きい場合に、塗布終端１０８や塗布始端（図示せず）の塗膜１０５を脱落させてしまうためと考えられる。したがって、塗布ロール１０４上の塗膜１０５に形成する切り込み部２０２，２０３の深さは、塗膜１０５の膜厚の５０％未満とすることが望ましい。 As a result, when the depth of the cut portions 202 and 203 was 50% or more of the film thickness of the coating film 105, a phenomenon in which the coating film 105 was chipped at the coating end point 108 as shown in FIG. 9 was observed. . As shown in FIGS. 1 to 4, since the coating film 105 moves along with the rotating application roll 104, the cut forming means 201 is moved in and out of the coating film 105 in a completely perpendicular direction. This is probably because the coating end point 108 and the coating end 105 (not shown) of the coating end 105 are dropped off when the depths of the cut portions 202 and 203 are large. Therefore, it is desirable that the depth of the cut portions 202 and 203 formed in the coating film 105 on the coating roll 104 is less than 50% of the film thickness of the coating film 105.
なお、塗料１０２の粘度が低すぎると、塗布ロール１０４表面で未乾燥状態にある塗膜１０５に切り込み部２０２，２０３を形成しても、該塗膜１０５を被塗布物１０７の表面に転写する前に切り込み部２０２，２０３に周囲の塗料が流れ込み、切り込み部２０２，２０３が消失してしまうことが推測される。 If the viscosity of the coating material 102 is too low, the coating film 105 is transferred to the surface of the coating object 107 even if the cut portions 202 and 203 are formed in the coating film 105 that is in an undried state on the surface of the coating roll 104. It is estimated that the surrounding paint flows into the notches 202 and 203 before, and the notches 202 and 203 disappear.
そこで、２８〜３２００Ｐａ・ｓの種々の粘度の塗料を用いて膜厚１５０μｍの塗膜を作製し、各塗膜に１５０μｍの深さの切り込み部、すなわち膜厚に対して１００％の深さの切り込み部を形成し、切り込み形成の３０秒後の切り込み深さをスポット径２μｍのレーザー変位計にて測定した。結果を図９に示す。 Therefore, a coating film having a film thickness of 150 μm is prepared using paints having various viscosities of 28 to 3200 Pa · s, and a cut portion having a depth of 150 μm is formed in each coating film, that is, a depth of 100% of the film thickness. A cut portion was formed, and the cut depth 30 seconds after the cut formation was measured with a laser displacement meter having a spot diameter of 2 μm. The results are shown in FIG.
図９から明らかなように、２００Ｐａ・ｓ未満の塗料を用いた場合、その塗膜に膜厚の１００％の深さまで切り込み部を形成しても、形成した切り込み部に周囲の塗料が流れ込む現象が顕著であり、直線状の塗膜端部を形成するために望ましい、膜厚の１５％の深さの切り込み部を残すことができない。したがって、本発明方法では、粘度２００Ｐａ・ｓ以上の塗料を用いることが望ましい。 As is clear from FIG. 9, when a paint of less than 200 Pa · s is used, the surrounding paint flows into the formed cut portion even if the cut portion is formed to a depth of 100% of the film thickness in the coating film. Is not possible, and it is not possible to leave a notch having a depth of 15% of the film thickness, which is desirable for forming a linear coating film edge. Therefore, in the method of the present invention, it is desirable to use a paint having a viscosity of 200 Pa · s or more.
以上のように、本発明の電極板の製造方法を構成する間欠塗工方法によれば、間欠的な塗膜を塗布始端から塗布終端にいたるまで高い膜厚精度にて形成できる。よって、高い膜厚精度が要求される製品、たとえば、ニッケル水素二次電池、リチウムイオン二次電池、燃料電池などにおける電池電極の製造に利用できる。 As described above, according to the intermittent coating method constituting the method for producing an electrode plate of the present invention, an intermittent coating can be formed with high film thickness accuracy from the coating start end to the coating end. Therefore, it can be used for the manufacture of battery electrodes in products requiring high film thickness accuracy, such as nickel metal hydride secondary batteries, lithium ion secondary batteries, and fuel cells.
たとえばリチウムイオン二次電池の電極は次のようにして製造できる。上述の塗膜１０５の材料を、プラネタリミキサ、三本ロール、高圧ホモジナイザー、超音波ホモジナイザーなどの一般的な混合・分散装置にて混合することで、粘度５００Ｐａｓの塗料を得る。この塗料を、上述の実施の形態に記載の方法を用いて被塗布物１０７の両面に間欠的に配置して塗膜１０５とし、これをロールプレスにより圧密化する。プレス前後の膜厚比（プレス後膜厚/プレス前膜厚）は、求められる電池性能に依存するが、一般的に０．５〜０．８の範囲である。プレス後の被塗布物１０７／塗膜１０５（たとえば幅３００ｍｍ）を、電池のサイズに合わせてスリットする。スリット後の塗膜幅は電池サイズにより異なるが一般的に２５〜６０ｍｍである。 For example, an electrode of a lithium ion secondary battery can be manufactured as follows. The material of the above-mentioned coating film 105 is mixed with a general mixing / dispersing device such as a planetary mixer, three rolls, a high-pressure homogenizer, or an ultrasonic homogenizer to obtain a paint having a viscosity of 500 Pas. This coating material is intermittently disposed on both surfaces of the object to be coated 107 by using the method described in the above embodiment to form a coating film 105, which is consolidated by a roll press. The film thickness ratio before and after pressing (film thickness after pressing / film thickness before pressing) depends on the required battery performance, but is generally in the range of 0.5 to 0.8. The object 107 / coating film 105 (for example, width 300 mm) after pressing is slit according to the size of the battery. The width of the coating film after the slit varies depending on the battery size, but is generally 25 to 60 mm.
本発明の電極板の製造方法は、塗布始端から塗布終端にいたるまで高い膜厚精度が要求される製品、たとえば、ニッケル水素二次電池、リチウムイオン二次電池、燃料電池などにおける電池電極の製造に特に有用である。 The method for producing an electrode plate of the present invention is the production of battery electrodes in products requiring high film thickness accuracy from the coating start end to the coating end, for example, nickel hydride secondary batteries, lithium ion secondary batteries, fuel cells, etc. Is particularly useful.
１０１ 貯留槽
１０２ 塗料
１０３ 調厚ロール
１０４ 塗布ロール
１０５ 塗膜
１０６ バックアップロール
１０７ 被塗布物
１０８ 塗布終端
１０９ 無地部
１１０ 塗布始端
２０１ 切り込み形成手段
２０２ 切り込み部
２０３ 切り込み部
２１１ 切り込み形成手段
２１２ 刃
２１３ 刃
DESCRIPTION OF SYMBOLS 101 Storage tank 102 Paint 103 Thickening roll 104 Application roll 105 Coating film 106 Backup roll 107 Coating object 108 Application | coating termination | terminus 109 Uncoated part 110 Application | coating start end 201 Incision formation means 202 Incision part 203 Incision part 211 Incision formation means 212 Blade 213 Blade
Claims (3)
前記第１ロールの表面に形成され前記第１ロールの回転に伴って移動する前記塗膜に対して、前記第１ロールの軸方向に沿う切り込み部を前記第１ロールの回転方向に沿って所定間隔にて複数に形成するとともに、
前記複数の切り込み部の内、任意の第１切り込み部が所定位置に到達した時に前記第１ロールと前記第３ロールとを互いに接近させ、前記第１切り込み部に後続する第２切り込み部が前記所定位置に到達した時に前記第１ロールと前記第３ロールとを互いに離間させることにより、前記第１切り込み部と前記第２切り込み部との間の前記塗膜を前記集電体の表面に転写することを特徴とする電極板の製造方法。 A first roll and a second roll and a third roll opposed to the first roll are disposed, and a coating film is formed on the surface of the first roll through an electrode paint between the first roll and the second roll. A coating film on the surface of one roll is transferred to the surface of a current collector that travels along the surface of the third roll, and an intermittent electrode coating film is formed on the surface of the current collector to produce an electrode plate. A method,
For the coating film formed on the surface of the first roll and moving with the rotation of the first roll, a notch along the axial direction of the first roll is predetermined along the rotation direction of the first roll. While forming multiple at intervals,
The first roll and the third roll are brought close to each other when an arbitrary first cut portion of the plurality of cut portions reaches a predetermined position, and a second cut portion following the first cut portion is When the predetermined position is reached, the first roll and the third roll are separated from each other, thereby transferring the coating film between the first cut portion and the second cut portion to the surface of the current collector. A method for manufacturing an electrode plate.
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