JP2010067507A - Method and device for manufacturing electrode - Google Patents

Method and device for manufacturing electrode Download PDF

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JP2010067507A
JP2010067507A JP2008233634A JP2008233634A JP2010067507A JP 2010067507 A JP2010067507 A JP 2010067507A JP 2008233634 A JP2008233634 A JP 2008233634A JP 2008233634 A JP2008233634 A JP 2008233634A JP 2010067507 A JP2010067507 A JP 2010067507A
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metal foil
electrode material
electrode
uncoated
press roller
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JP5359136B2 (en
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Yusuke Tateyama
悠介 竪山
Shigenori Kazama
重徳 風間
Akikazu Ito
晃数 伊藤
Tomoyuki Natsume
智之 夏目
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Nissan Motor Co Ltd
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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
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for manufacturing an electrode for improving productivity while maintaining superior product quality. <P>SOLUTION: The electrode manufacturing method includes: a coating process for applying an electrode material 5 containing solvent to a surface of a metal foil 4; a drying process for evaporating the solvent; and a pressing process for pressing an electrode material by a press roller 19 relatively moving against a metal foil. In the coating process, a coated part 8 is formed by continuously applying the electrode material and an uncoated part 9 is formed by exposing a surface of the metal foil. In the pressing process, the electrode material is pressed in a direction crossing a boundary between the coated part and the uncoated part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電極製造方法および電極製造装置に関する。   The present invention relates to an electrode manufacturing method and an electrode manufacturing apparatus.

電子機器や電気自動車等の駆動用電源として用いられるリチウムイオン電池は、一般的に、扁平な電極が重なった構造を有する。電極は、集電体としての金属箔の面に活物質や溶媒を含む電極材を塗布し、電極材を乾燥して作製される。   A lithium ion battery used as a power source for driving an electronic device or an electric vehicle generally has a structure in which flat electrodes are overlapped. The electrode is produced by applying an electrode material containing an active material or a solvent to the surface of a metal foil as a current collector and drying the electrode material.

電極材を塗布する方法として、長尺な金属箔の面に、スリットダイが連続的に電極材を塗布する連続塗工方式が知られている。例えば特許文献１に記載の発明は、電池同士或いは電池の端子と金属箔とを電気的に接続するためのタブを金属箔に形成するため、電極材の塗布方向に沿って金属箔の面を露出させながら、電極材を連続的に塗布している。電極材の塗布後、電極材は乾燥され、表面をなめらかにするためにプレス加工が施される。   As a method for applying an electrode material, a continuous coating method in which a slit die continuously applies an electrode material on the surface of a long metal foil is known. For example, in the invention described in Patent Document 1, in order to form tabs for electrically connecting batteries or battery terminals and metal foil on the metal foil, the surface of the metal foil is formed along the application direction of the electrode material. The electrode material is continuously applied while being exposed. After the application of the electrode material, the electrode material is dried and subjected to press working to smooth the surface.

金属箔の面を露出させつつ電極材を塗布する場合、電極材は金属箔の面から突出している。このため、プレスの際に押圧され易く、金属箔の面が露出した未塗工部に比べ、電極材が配置された金属箔の塗工部には大きな力が加わり、プレスした際の塗工部の寸法変化は、未塗工部の寸法変化より大きい。   When the electrode material is applied while exposing the surface of the metal foil, the electrode material protrudes from the surface of the metal foil. For this reason, compared to the uncoated part where the surface of the metal foil is easy to be pressed during pressing, a large force is applied to the coated part of the metal foil on which the electrode material is arranged, and the coating when pressed is applied. The dimensional change of the part is larger than the dimensional change of the uncoated part.

特に、特許文献１に記載のように電極材を長尺状に連続して塗布すると、プレスした際、塗工部と未塗工部との境に沿う方向における、両者の伸びの差が大きくなり、金属箔の歪みが顕著になり易い。   In particular, when the electrode material is continuously applied in a long shape as described in Patent Document 1, when pressed, there is a large difference in elongation in the direction along the boundary between the coated part and the uncoated part. Therefore, the distortion of the metal foil tends to be remarkable.

このような歪みを抑制するために、特許文献１に記載の発明は複数の切れ目を未塗工部に予め設け、切れ目によって、プレスした際に生じる塗工部と未塗工部との寸法変化の差を吸収している。
特開平１１−３５４１０３号公報 In order to suppress such distortion, the invention described in Patent Document 1 provides a plurality of cuts in the uncoated part in advance, and the dimensional change between the coated part and the uncoated part that occurs when pressing is performed by the cut. The difference is absorbed.
Japanese Patent Laid-Open No. 11-354103

しかし、特許文献１に記載の発明は、金属箔の歪みの発生を抑制するために、未塗工部に複数の切れ目を予め形成するため、工数の増加を招き生産性が低下する。   However, since the invention described in Patent Document 1 forms a plurality of cuts in the uncoated part in advance in order to suppress the occurrence of distortion of the metal foil, the number of man-hours is increased and the productivity is lowered.

本発明は、上記課題を解決するためになされたものである。すなわち、未塗工部と連続する塗工部とを有する金属箔における歪みを抑制して良好な製品品質を維持するとともに、生産性の向上を図り得る電極製造方法および電極製造装置を提供することを、本発明の目的とする。   The present invention has been made to solve the above problems. That is, to provide an electrode manufacturing method and an electrode manufacturing apparatus capable of suppressing distortion in a metal foil having an uncoated part and a continuous coated part to maintain good product quality and improve productivity. Is an object of the present invention.

上記目的を達成するための本発明の電極製造方法は、溶媒を含む電極材を金属箔の面に塗布する塗工工程と、溶媒を蒸発させる乾燥工程と、金属箔と相対移動するプレスローラーによって電極材をプレスするプレス工程と、を有する。   The electrode manufacturing method of the present invention for achieving the above object includes a coating step of applying an electrode material containing a solvent to the surface of the metal foil, a drying step of evaporating the solvent, and a press roller that moves relative to the metal foil. A pressing step of pressing the electrode material.

塗工工程では、電極材が連続的に塗布されてなる塗工部、および金属箔の面が露出されてなる未塗工部を形成し、プレス工程において、塗工部と未塗工部との境に交わる交差方向に電極材をプレスする。   In the coating process, a coated part in which the electrode material is continuously applied and an uncoated part in which the surface of the metal foil is exposed are formed. In the pressing process, the coated part and the uncoated part are The electrode material is pressed in the crossing direction that crosses the border.

上記目的を達成するための本発明の電極製造装置は、溶媒を含む電極材を金属箔の面に塗布する塗工手段と、溶媒を蒸発させる乾燥手段と、金属箔を切断する切断手段と、電極材をプレスするプレスローラーと、プレスローラーに金属箔を供給する供給手段と、を有する。   The electrode manufacturing apparatus of the present invention for achieving the above object comprises a coating means for applying an electrode material containing a solvent to the surface of the metal foil, a drying means for evaporating the solvent, a cutting means for cutting the metal foil, A press roller for pressing the electrode material; and a supply means for supplying a metal foil to the press roller.

塗工手段は、電極材が連続的に塗布されてなる塗工部、および金属箔の面が露出されてなる未塗工部を形成するように電極材を塗布する。プレスローラーは金属箔と相対移動し、塗工部と未塗工部との境に交わる交差方向に電極材をプレスする。また、供給手段は、交差方向からプレスローラーに金属箔を供給する。   The coating means applies the electrode material so as to form a coated portion where the electrode material is continuously applied and an uncoated portion where the surface of the metal foil is exposed. The press roller moves relative to the metal foil and presses the electrode material in the crossing direction that intersects the boundary between the coated part and the uncoated part. Moreover, a supply means supplies metal foil to a press roller from a cross direction.

本発明のプレスローラーは、塗工部と未塗工部との境に沿って電極材をプレスするのではなく、塗工部と未塗工部との境に交わる方向に電極材をプレスする。   The press roller of the present invention does not press the electrode material along the boundary between the coated part and the uncoated part, but presses the electrode material in a direction intersecting with the boundary between the coated part and the uncoated part. .

このため、塗工部と未塗工部との境に沿う方向での両者の伸びが抑制され、本発明は、金属箔の歪みを抑制できる。また、本発明はプレスする方向により歪みを抑制するため、複数の切れ目を設ける等、別途の手間が必要ない。したがって、本発明は、良好な製品品質を維持しつつ、生産性の向上を図り得る。   For this reason, both elongation in the direction along the boundary of a coating part and an uncoated part is suppressed, and this invention can suppress distortion of metal foil. In addition, since the present invention suppresses distortion depending on the pressing direction, there is no need for additional labor such as providing a plurality of cuts. Therefore, the present invention can improve productivity while maintaining good product quality.

以下、図面を参照して本発明の実施形態を説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は電極材の塗布および乾燥を説明するための概略構成図、図２は図１のＩＩからの矢視図である。図３は金属箔の切断を説明するための概略構成図、図４は金属箔の切断パターンを示す平面図、図５（Ａ）は図３のＶからの矢視図、図５（Ｂ）は図５（Ａ）のＢからの矢視図である。図６（Ａ）は比較例を説明するための部分拡大概略構成図、図６（Ｂ）は図６（Ａ）のＢからの矢視図である。図７（Ａ）は図６（Ｂ）のＶＩＩ−ＶＩＩ線に沿う概略断面図、図７（Ｂ）は比較例における金属箔の伸びを示す平面図、図７（Ｃ）は実施形態における金属箔の伸びを示す平面図である。図８（Ａ）は実施形態のプレスローラーの幅を示す概略平面図、図８（Ｂ）は比較例のプレスローラーの幅を示す概略平面図である。   FIG. 1 is a schematic configuration diagram for explaining application and drying of an electrode material, and FIG. 2 is a view as viewed from an arrow II in FIG. 3 is a schematic configuration diagram for explaining the cutting of the metal foil, FIG. 4 is a plan view showing the cutting pattern of the metal foil, FIG. 5A is an arrow view from V in FIG. 3, and FIG. FIG. 6 is an arrow view from B in FIG. 6A is a partially enlarged schematic configuration diagram for explaining a comparative example, and FIG. 6B is an arrow view from B in FIG. 6A. 7A is a schematic cross-sectional view taken along line VII-VII in FIG. 6B, FIG. 7B is a plan view showing the elongation of the metal foil in the comparative example, and FIG. 7C is the metal in the embodiment. It is a top view which shows elongation of foil. FIG. 8A is a schematic plan view showing the width of the press roller of the embodiment, and FIG. 8B is a schematic plan view showing the width of the press roller of the comparative example.

概説すると本実施形態の電極製造方法は、まず溶媒を含む電極材５を金属箔４の一方の面に塗布し、電極材５の溶媒を蒸発させる。金属箔４の他の面にも電極材５を塗布し、電極材５を乾燥させる。その後、金属箔４を切断し、電極材５をプレスする。製造される電極は、集電体としての金属箔４の両面に、活物質を含んだ電極材５を配した構造を有する。   In brief, in the electrode manufacturing method of the present embodiment, the electrode material 5 containing a solvent is first applied to one surface of the metal foil 4 and the solvent of the electrode material 5 is evaporated. The electrode material 5 is applied to the other surface of the metal foil 4 and the electrode material 5 is dried. Thereafter, the metal foil 4 is cut and the electrode material 5 is pressed. The manufactured electrode has a structure in which an electrode material 5 containing an active material is arranged on both surfaces of a metal foil 4 as a current collector.

本実施形態では、電極材５を塗布するスリットダイ１、電極材５を乾燥させる乾燥炉２、金属箔４を切断するシャーリングマシン１２、電極材５をプレスするプレスローラー１９、およびプレスローラー１９に金属箔４を供給するベルトコンベア１７が、各工程において動作する。これら複数の装置や部材は、１つの電極製造装置を構成する。   In this embodiment, the slit die 1 for applying the electrode material 5, the drying furnace 2 for drying the electrode material 5, the shearing machine 12 for cutting the metal foil 4, the press roller 19 for pressing the electrode material 5, and the press roller 19 A belt conveyor 17 that supplies the metal foil 4 operates in each step. The plurality of devices and members constitute one electrode manufacturing device.

図１に示すように、電極材５を塗布するスリットダイ１（塗工手段に相当）は、先細り形状の対をなすリップ３を有する。対をなすリップ３は、隙間をあけて対向し、スリット状の吐出口を形成する。スリットダイ１は、金属箔４の面に対向し、搬送される金属箔４に対して吐出口から連続的に電極材５を塗布する。   As shown in FIG. 1, a slit die 1 (corresponding to a coating means) for applying an electrode material 5 has a pair of tapered lips 3. The lips 3 forming a pair face each other with a gap therebetween to form a slit-like discharge port. The slit die 1 opposes the surface of the metal foil 4 and continuously applies the electrode material 5 to the metal foil 4 being conveyed from the discharge port.

本実施形態は、電極材５の塗布および乾燥に、量産に適したロールトゥロール方式を用いる。モーターにより回転する巻取りロール６が、金属箔４を巻回してなる供給ロール７から金属箔４を巻取りつつ金属箔４を移動させ、その間に金属箔４への電極材５の塗布および乾燥が行われる。   In this embodiment, a roll-to-roll method suitable for mass production is used for applying and drying the electrode material 5. A winding roll 6 rotated by a motor moves the metal foil 4 while winding the metal foil 4 from a supply roll 7 formed by winding the metal foil 4, while applying and drying the electrode material 5 on the metal foil 4. Is done.

金属箔４は、適宜の材料、例えば、アルミニウム、銅、ニッケル、鉄、ステンレス鋼を用いることができる。例えば、正極集電体にはアルミニウムなどの金属箔４を用い、負極集電体には銅などの金属箔４を用いることができる。金属箔４の具体的な厚さについて特に制限はないが、例えば、アルミニウムの場合には２０μｍ、銅の場合には１０μｍ程度の薄膜である。   The metal foil 4 can use an appropriate material, for example, aluminum, copper, nickel, iron, and stainless steel. For example, a metal foil 4 such as aluminum can be used for the positive electrode current collector, and a metal foil 4 such as copper can be used for the negative electrode current collector. Although there is no restriction | limiting in particular about the specific thickness of the metal foil 4, For example, in the case of aluminum, it is a thin film about 20 micrometers in the case of copper.

電極材５は、正極を形成するために用いる正極スラリーと、負極を形成するために用いる負極スラリーとがある。   The electrode material 5 includes a positive electrode slurry used for forming a positive electrode and a negative electrode slurry used for forming a negative electrode.

正極スラリーは、例えば、正極活物質、導電助剤、およびバインダを有し、溶媒を添加することで、所定の粘度にされる。正極活物質は、例えば、マンガン酸リチウムである。導電助剤は、例えば、アセチレンブラックである。バインダは、例えば、ＰＶＤＦ（ポリフッ化ビニリデン）である。溶媒は、例えば、ＮＭＰ（ノルマルメチルピロリドン）である。なお、正極活物質は、マンガン酸リチウムに特に限定されないが、容量および出力特性の観点から、リチウム−遷移金属複合酸化物を適用することが好ましい。導電助剤は、例えば、カーボンブラックやグラファイトを利用することも可能である。バインダおよび溶媒は、ＰＶＤＦおよびＮＭＰに限定されない。   The positive electrode slurry has, for example, a positive electrode active material, a conductive additive, and a binder, and has a predetermined viscosity by adding a solvent. The positive electrode active material is, for example, lithium manganate. The conductive auxiliary agent is, for example, acetylene black. The binder is, for example, PVDF (polyvinylidene fluoride). The solvent is, for example, NMP (normal methyl pyrrolidone). Although the positive electrode active material is not particularly limited to lithium manganate, it is preferable to apply a lithium-transition metal composite oxide from the viewpoint of capacity and output characteristics. For example, carbon black or graphite can be used as the conductive assistant. The binder and solvent are not limited to PVDF and NMP.

負極スラリーは、例えば、負極活物質、導電助剤、およびバインダを有し、溶媒を添加することで、所定の粘度にされる。負極活物質は、例えば、グラファイトである。導電助剤、バインダ、および溶媒は、例えば、アセチレンブラック、ＰＶＤＦ、およびＮＭＰである。なお、負極活物質は、グラファイトに特に限定されず、ハードカーボンや、リチウム−遷移金属複合酸化物を利用することも可能である。導電助剤は、例えば、カーボンブラックやグラファイトを利用することも可能である。バインダおよび溶媒は、ＰＶＤＦおよびＮＭＰに限定されない。   The negative electrode slurry has, for example, a negative electrode active material, a conductive additive, and a binder, and is adjusted to a predetermined viscosity by adding a solvent. The negative electrode active material is, for example, graphite. Conductive aids, binders, and solvents are, for example, acetylene black, PVDF, and NMP. Note that the negative electrode active material is not particularly limited to graphite, and hard carbon or a lithium-transition metal composite oxide can also be used. For example, carbon black or graphite can be used as the conductive assistant. The binder and solvent are not limited to PVDF and NMP.

電極材５の溶媒を蒸発させる乾燥炉２（乾燥手段に相当）は、スリットダイ１と巻取りロール６との間に位置して金属箔４および電極材５を囲み、金属箔４が搬送されている間に電極材５の溶媒を蒸発させる。   A drying furnace 2 (corresponding to a drying means) for evaporating the solvent of the electrode material 5 is located between the slit die 1 and the winding roll 6 and surrounds the metal foil 4 and the electrode material 5, and the metal foil 4 is conveyed. During this, the solvent of the electrode material 5 is evaporated.

乾燥炉２は、誘導コイルが金属箔４に磁場を作用させて金属箔４に熱を付与し、その熱により電極材５を加熱して溶媒を蒸発させる誘導加熱式乾燥炉である。この他に、乾燥炉２は、熱風により溶媒を蒸発させる熱風式乾燥炉であってもよい。巻取りロール６が金属箔４を巻き取った後、以上説明した過程と同様の過程により、電極材５の塗布されていない反対の面にも電極材５が配置される。乾燥炉２による加熱およびその後の自然冷却を経た後の電極材５の溶媒濃度は、例えば１００ｐｐｍ以下である。   The drying furnace 2 is an induction heating type drying furnace in which an induction coil applies a magnetic field to the metal foil 4 to apply heat to the metal foil 4 and heats the electrode material 5 by the heat to evaporate the solvent. In addition, the drying furnace 2 may be a hot air drying furnace that evaporates the solvent with hot air. After the winding roll 6 winds up the metal foil 4, the electrode material 5 is arranged on the opposite surface where the electrode material 5 is not applied by the same process as described above. The solvent concentration of the electrode material 5 after heating by the drying furnace 2 and subsequent natural cooling is, for example, 100 ppm or less.

図２に示すように、スリットダイ１は、金属箔４の面の全体に電極材５を塗布するのではなく、塗布方向に沿って金属箔４の面の縁を帯状に露出（符号９で示す部分）させながら、連続的に電極材５を塗布する。以下、電極材５が塗布された金属箔４の部分を塗工部８と称し、電極材５が塗布されず金属箔４の面が露出した部分を未塗工部９と称す。   As shown in FIG. 2, the slit die 1 does not apply the electrode material 5 to the entire surface of the metal foil 4, but exposes the edge of the surface of the metal foil 4 in a strip shape along the application direction (reference numeral 9). The electrode material 5 is continuously applied while the portion shown in FIG. Hereinafter, the portion of the metal foil 4 to which the electrode material 5 is applied is referred to as a coated portion 8, and the portion where the electrode material 5 is not applied and the surface of the metal foil 4 is exposed is referred to as an uncoated portion 9.

未塗工部９は、電池同士或いは電池の端子と金属箔４とを電気的に接続するためのタブとなる。また、未塗工部９を金属箔４の面の縁に設けることにより、金属箔４の一方の面に塗布した電極材５が、反対の面に垂れるのを防止できる。   The uncoated portion 9 serves as a tab for electrically connecting the batteries or battery terminals and the metal foil 4. Moreover, by providing the uncoated part 9 at the edge of the surface of the metal foil 4, it is possible to prevent the electrode material 5 applied to one surface of the metal foil 4 from dripping onto the opposite surface.

図３に示すように、金属箔４の切断では、まず、電極材５に当接する複数のローラー１１を備えたレベラー１０が、巻取りロール６による巻回により巻き癖を持った金属箔４を平坦にする。複数のローラー１１は、金属箔４の面を挟んで互い違いに並び、金属箔４がローラー１１の間を通過する間に、金属箔４を平板状に矯正する。   As shown in FIG. 3, in the cutting of the metal foil 4, first, the leveler 10 including a plurality of rollers 11 that are in contact with the electrode material 5 removes the metal foil 4 having curl due to winding by the winding roll 6. Make it flat. The plurality of rollers 11 are arranged in a staggered manner across the surface of the metal foil 4, and the metal foil 4 is corrected into a flat plate shape while the metal foil 4 passes between the rollers 11.

レベラー１０が金属箔４を平坦にした後、一対の刃１４、１５を備えたシャーリングマシン１２（切断手段に相当）が、金属箔４を一定の幅で矩形形状に切断する。一対の刃１４、１５は、金属箔４の面の両側から金属箔４を挟み、金属箔４を切断する。シャーリングマシン１２は、切断した金属箔４を受けるベルトコンベア１６を備える。ベルトコンベア１６は、切断後の金属箔４を搬送し、ベルトコンベア１６の端の近傍に配置されたベルトコンベア１７（供給手段に相当）に、切断した金属箔４を移す。   After the leveler 10 flattens the metal foil 4, a shearing machine 12 (corresponding to a cutting means) provided with a pair of blades 14 and 15 cuts the metal foil 4 into a rectangular shape with a certain width. The pair of blades 14 and 15 sandwich the metal foil 4 from both sides of the surface of the metal foil 4 and cut the metal foil 4. The shearing machine 12 includes a belt conveyor 16 that receives the cut metal foil 4. The belt conveyor 16 conveys the cut metal foil 4 and transfers the cut metal foil 4 to a belt conveyor 17 (corresponding to a supply means) disposed near the end of the belt conveyor 16.

ベルトコンベア１６とベルトコンベア１７とは、垂直方向において位置がずれており、金属箔４は、ベルトコンベア１６の端に設けられたガイド１８に沿ってベルトコンベア１７に移る。   The positions of the belt conveyor 16 and the belt conveyor 17 are shifted in the vertical direction, and the metal foil 4 moves to the belt conveyor 17 along the guide 18 provided at the end of the belt conveyor 16.

モーターにより回転する搬送ローラー１３は、巻取りロール６が金属箔４（両面に電極材５を配置）を巻回してなるロール２０から、金属箔４を引き出しつつ搬送し、レベラー１０およびシャーリングマシン１２に、金属箔４を供給する。   A conveyance roller 13 rotated by a motor conveys the metal foil 4 while pulling it out from a roll 20 in which a winding roll 6 winds a metal foil 4 (electrode material 5 is disposed on both sides), and a leveler 10 and a shearing machine 12. The metal foil 4 is supplied.

シャーリングマシン１２は、図４に示すように、電極材５の塗布方向と直交する方向に金属箔４を切断する。切断された金属箔４の幅Ｌ２は、長尺な金属箔４の短手方向の長さＬ１より短い（Ｌ１＞Ｌ２）。   As shown in FIG. 4, the shearing machine 12 cuts the metal foil 4 in a direction orthogonal to the application direction of the electrode material 5. The width L2 of the cut metal foil 4 is shorter than the length L1 in the short direction of the long metal foil 4 (L1> L2).

図５（Ａ）に示すように、ベルトコンベア１７は、対をなすプレスローラー１９に切断した金属箔４を供給する。プレスローラー１９は、例えば、金属製の金属ローラーである。   As shown in FIG. 5A, the belt conveyor 17 supplies the cut metal foil 4 to a pair of press rollers 19. The press roller 19 is, for example, a metal metal roller.

ベルトコンベア１６の搬送方向とベルトコンベア１７の搬送方向とは、互いに直交している。金属箔４は、ベルトコンベア１６からベルトコンベア１７に移ることにより、搬送方向に対する金属箔４の向きが９０度変化する。   The conveying direction of the belt conveyor 16 and the conveying direction of the belt conveyor 17 are orthogonal to each other. When the metal foil 4 moves from the belt conveyor 16 to the belt conveyor 17, the orientation of the metal foil 4 with respect to the transport direction changes by 90 degrees.

具体的には、ベルトコンベア１６は、塗工部８と未塗工部９との境に沿う方向に金属箔４を搬送し、ベルトコンベア１７は、塗工部８と未塗工部９との境に直交する方向に金属箔４を搬送する。   Specifically, the belt conveyor 16 conveys the metal foil 4 in a direction along the boundary between the coated portion 8 and the uncoated portion 9, and the belt conveyor 17 includes the coated portion 8, the uncoated portion 9, and the like. The metal foil 4 is conveyed in a direction orthogonal to the boundary.

すなわちベルトコンベア１７は、塗工部８と未塗工部９との境に沿う方向からではなく、塗工部８と未塗工部９との境に直交する方向から、金属箔４をプレスローラー１９に供給する。プレスローラー１９は、金属箔４を引き込み、塗工部８と未塗工部９との境に直交する方向から金属箔４を加圧する。図５（Ｂ）に示すように、プレスローラー１９は、未塗工部９および塗工部８を交互に加圧し、電極材５の表面をなめらかな面にする。   That is, the belt conveyor 17 presses the metal foil 4 not from the direction along the boundary between the coated part 8 and the uncoated part 9 but from the direction orthogonal to the boundary between the coated part 8 and the uncoated part 9. Supply to roller 19. The press roller 19 pulls in the metal foil 4 and presses the metal foil 4 from a direction orthogonal to the boundary between the coated part 8 and the uncoated part 9. As shown in FIG. 5 (B), the press roller 19 alternately pressurizes the uncoated portion 9 and the coated portion 8 to make the surface of the electrode material 5 a smooth surface.

本実施形態の効果を比較例と対比しつつ説明する。   The effect of this embodiment will be described in comparison with a comparative example.

図６（Ａ）に示すように、比較例は、シャーリングマシン１２が金属箔４を切断した後、金属箔４は向きを変えることなくプレスローラー１９Ａを通過する点で、本実施形態と異なる。すなわち比較例では、図６（Ｂ）に示すように、金属箔４は塗工部８と未塗工部９との境に沿う方向からプレスローラー１９Ａを通過し、塗工部８と未塗工部９とが同時にプレスローラー１９Ａを通過する。   As shown in FIG. 6A, the comparative example is different from the present embodiment in that after the shearing machine 12 cuts the metal foil 4, the metal foil 4 passes through the press roller 19A without changing its orientation. That is, in the comparative example, as shown in FIG. 6B, the metal foil 4 passes through the press roller 19 </ b> A from the direction along the boundary between the coated portion 8 and the uncoated portion 9, and is uncoated with the coated portion 8. The construction part 9 passes through the press roller 19A at the same time.

塗工部８と未塗工部９とが同時にプレスローラー１９Ａを通過すると、図７（Ａ）に示すようにプレスローラー１９Ａは電極材５に当接するため、未塗工部９を殆ど加圧せず、塗工部８に力が集中する。   When the coating part 8 and the uncoated part 9 simultaneously pass the press roller 19A, the press roller 19A comes into contact with the electrode material 5 as shown in FIG. Without force, the force concentrates on the coating part 8.

このため、図７（Ｂ）に示すように、塗工部８は塗工部８と未塗工部９との境に沿う方向に伸びるが、未塗工部９は元の長さから殆ど変化しない。この結果、伸びた塗工部８は、殆ど変化しない未塗工部９に拘束されて変形し、金属箔４に歪みが生ずる。特に、塗工部８と未塗工部９と境に沿ってプレスする距離が長くなると、歪みが累積し、金属箔４の歪みが顕著になる。   For this reason, as shown in FIG. 7 (B), the coated part 8 extends in a direction along the boundary between the coated part 8 and the uncoated part 9, but the uncoated part 9 is almost from the original length. It does not change. As a result, the stretched coated part 8 is deformed by being restrained by the uncoated part 9 that hardly changes, and the metal foil 4 is distorted. In particular, when the distance to be pressed along the boundary between the coated part 8 and the uncoated part 9 becomes longer, the distortion accumulates and the distortion of the metal foil 4 becomes remarkable.

これに対し本実施形態では、塗工部８と未塗工部９との境に直交する方向からプレスローラー１９は金属箔４をプレスするため、図７（Ｃ）に示すように、塗工部８および未塗工部９はこの方向に伸びようとする。一方、塗工部８と未塗工部９との境に沿う方向では伸びが抑制され、両者の境に沿って長さの差が殆ど生じない。よって、本実施形態は、金属箔４の歪みを抑制できる。   On the other hand, in this embodiment, since the press roller 19 presses the metal foil 4 from the direction orthogonal to the boundary between the coated portion 8 and the uncoated portion 9, as shown in FIG. The part 8 and the uncoated part 9 tend to extend in this direction. On the other hand, elongation is suppressed in the direction along the boundary between the coated part 8 and the uncoated part 9, and there is almost no difference in length along the boundary between the two. Therefore, this embodiment can suppress distortion of the metal foil 4.

また、本実施形態はプレスする方向により歪みを抑制するため、未塗工部９に複数の切れ目を設ける等、別途の手間を必要としない。したがって、本実施形態は良好な製品品質を維持しつつ生産性の向上を図り得る。   In addition, since the present embodiment suppresses distortion depending on the pressing direction, no additional effort is required such as providing a plurality of cuts in the uncoated portion 9. Therefore, this embodiment can improve productivity while maintaining good product quality.

本実施形態では、シャーリングマシン１２が、金属箔４を幅Ｌ２で切断し、図８（Ａ）に示すように、プレスローラー１９が、切断した金属箔４を短辺Ｌ２側からプレスする。よって、図８（Ｂ）に示す比較例のように長辺Ｌ１側からプレスする場合に比べプレスローラー１９の幅が小さくてすみ（Ｌ４＞Ｌ３）、本実施形態は装置をコンパクトにできる。   In the present embodiment, the shearing machine 12 cuts the metal foil 4 with a width L2, and as shown in FIG. 8A, the press roller 19 presses the cut metal foil 4 from the short side L2 side. Therefore, as compared with the case of pressing from the long side L1 side as in the comparative example shown in FIG. 8B, the width of the press roller 19 is small (L4> L3), and this embodiment can make the apparatus compact.

＜変形例＞
図９は変形例を説明するための概略斜視図である。 <Modification>
FIG. 9 is a schematic perspective view for explaining a modification.

変形例は、実施形態と略同様の構成を有するが、スリットダイ１Ａが、２つに分かれた吐出口を備え、図９に示すように電極材を縞状に塗布し、２つの塗工部８Ａ、および塗工部８Ａの間に位置する１つの未塗工部９Ａを形成する点で第１実施形態と異なる。２つの塗工部８Ａは互いに平行に伸びる。   The modified example has substantially the same configuration as that of the embodiment, but the slit die 1A includes two ejection openings, and the electrode material is applied in a striped pattern as shown in FIG. It differs from the first embodiment in that one uncoated portion 9A located between 8A and the coated portion 8A is formed. The two coating parts 8A extend in parallel to each other.

金属箔４の切断後、プレスローラー１９は、塗工部８Ａと未塗工部９Ａとの境に直交する方向から金属箔４をプレスする。プレスにより、未塗工部９Ａおよび２つの塗工部８Ａは、両者の境に直交する方向に伸びようとする。一方、塗工部８Ａと未塗工部９Ａとの境に沿う方向では伸びが抑制され、変形例は、実施形態と同様の効果を奏する。   After cutting the metal foil 4, the press roller 19 presses the metal foil 4 from a direction orthogonal to the boundary between the coated portion 8A and the uncoated portion 9A. By pressing, the uncoated portion 9A and the two coated portions 8A tend to extend in a direction perpendicular to the boundary between them. On the other hand, elongation is suppressed in the direction along the boundary between the coated portion 8A and the uncoated portion 9A, and the modified example has the same effect as the embodiment.

本発明は、上述した実施形態に限定されるものではなく、特許請求の範囲の範囲内で種々改変できる。   The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the claims.

例えば、プレスローラー１９は、塗工部８と未塗工部９との境に交わる交差方向に電極材５をプレスし、金属箔４の歪みを抑制できればよく、塗工部８と未塗工部９との境に直交する方向からずれていてもよい。また、電極材５をプレスするプレスローラー１９は、相対移動しつつ電極材５の表面を押圧してなめらかにするものであればよく、金属ローラーの他、例えば弾性ローラーや加熱ローラー等、公知技術を用いることができる。   For example, the press roller 19 only needs to press the electrode material 5 in the intersecting direction intersecting the boundary between the coated portion 8 and the uncoated portion 9 to suppress the distortion of the metal foil 4. It may deviate from the direction orthogonal to the boundary with the part 9. Moreover, the press roller 19 which presses the electrode material 5 should just smooth the surface by pressing the surface of the electrode material 5 while moving relatively, and besides a metal roller, for example, well-known techniques, such as an elastic roller and a heating roller Can be used.

金属箔４とプレスローラー１９とは相対移動すればよく、実施形態のように金属箔４が移動する形態に限定されず、プレスローラー１９が移動しつつ電極材５をプレスする形態であってもよいし、両者が移動する形態であってもよい。   The metal foil 4 and the press roller 19 only need to move relative to each other, and are not limited to the form in which the metal foil 4 moves as in the embodiment, and may be a form in which the electrode material 5 is pressed while the press roller 19 moves. Alternatively, both may move.

ベルトコンベア１７は、ベルトコンベア１６の搬送方向に対して直交するように位置することで金属箔４の向きを変え、塗工部８と未塗工部９との境に直交する方向から金属箔４をプレスローラー１９に供給している。   The belt conveyor 17 is positioned so as to be orthogonal to the conveying direction of the belt conveyor 16, thereby changing the direction of the metal foil 4, and the metal foil from the direction orthogonal to the boundary between the coated part 8 and the uncoated part 9. 4 is supplied to the press roller 19.

しかし、本発明はこの実施形態に限定されない。すなわち、プレスする方向が、塗工部８と未塗工部９との境に交わる交差方向であればよい。例えば、ターンテーブルを用いて切断後の金属箔４の向きを変え、交差方向とプレス方向とが一致するようにしてもよいし、金属箔４の向きは変えずプレスローラー１９を交差方向に移動させてプレスしてもよい。   However, the present invention is not limited to this embodiment. That is, the pressing direction may be an intersecting direction that intersects the boundary between the coated portion 8 and the uncoated portion 9. For example, the direction of the metal foil 4 after cutting may be changed by using a turntable so that the crossing direction and the pressing direction coincide with each other, and the press roller 19 is moved in the crossing direction without changing the direction of the metal foil 4. You may press it.

変形例では、２つの塗工部８Ａと塗工部８Ａの間に位置する１つの未塗工部９Ａとを形成する例を示したが、本発明はこれに限定されない。例えば、３つの塗工部とこれらの間に位置する２つの未塗工部とを形成してもよく、作製しようとする電極のパターンに合わせて種々改変できる。   In the modification, an example in which one uncoated portion 9A positioned between the two coated portions 8A and the coated portion 8A is shown, but the present invention is not limited to this. For example, three coated portions and two uncoated portions located between them may be formed, and various modifications can be made according to the pattern of the electrode to be produced.

また、切断手段は、シャーリングマシン１２に限定されず、金属箔４を切断可能なものであればよく、公知技術を用いることができる。例えば、パンチングマシンやレーザマシンが挙げられる。   Further, the cutting means is not limited to the shearing machine 12, and any cutting means may be used as long as it can cut the metal foil 4, and a known technique can be used. For example, a punching machine and a laser machine are mentioned.

電極材の塗布および乾燥を説明するための概略構成図である。It is a schematic block diagram for demonstrating application | coating and drying of an electrode material. 図１のＩＩからの矢視図である。It is an arrow view from II of FIG. 金属箔の切断を説明するための概略構成図である。It is a schematic block diagram for demonstrating the cutting | disconnection of metal foil. 金属箔の切断パターンを示す平面図である。It is a top view which shows the cutting pattern of metal foil. （Ａ）は図３のＶからの矢視図、（Ｂ）は図５（Ａ）のＢからの矢視図である。(A) is an arrow view from V of FIG. 3, (B) is an arrow view from B of FIG. 5 (A). （Ａ）は比較例を説明するための部分拡大概略構成図、（Ｂ）は図６（Ａ）のＢからの矢視図である。(A) is a partial expansion schematic block diagram for demonstrating a comparative example, (B) is an arrow line view from B of FIG. 6 (A). （Ａ）は図６（Ｂ）のＶＩＩ−ＶＩＩに沿う概略断面図、（Ｂ）は比較例における金属箔の伸びを示す平面図、（Ｃ）は実施形態における金属箔の伸びを示す平面図である。(A) is a schematic sectional view taken along VII-VII in FIG. 6 (B), (B) is a plan view showing the elongation of the metal foil in the comparative example, and (C) is a plan view showing the elongation of the metal foil in the embodiment. It is. （Ａ）は実施形態のプレスローラーの幅を示す概略平面図、図８（Ｂ）は比較例のプレスローラーの幅を示す概略平面図である。(A) is a schematic plan view which shows the width | variety of the press roller of embodiment, FIG.8 (B) is a schematic plan view which shows the width | variety of the press roller of a comparative example. 変形例を説明するための概略斜視図である。It is a schematic perspective view for demonstrating a modification.

符号の説明Explanation of symbols

１ スリットダイ（塗工手段）、
２ 乾燥炉（乾燥手段）、
３ リップ、
４ 金属箔、
５ 電極材、
６ 巻取りロール、
７ 供給ロール、
８ 塗工部、
９ 未塗工部、
１０ レベラー、
１１ ローラー、
１２ シャーリングマシン（切断手段）、
１３ 搬送ローラー、
１４、１５ 刃、
１６ ベルトコンベア、
１７ ベルトコンベア（供給手段）、
１８ ガイド、
１９ プレスローラー。 1 Slit die (coating means),
2 drying oven (drying means),
3 Lips,
4 Metal foil,
5 electrode material,
6 winding roll,
7 Supply roll,
8 coating department,
9 Uncoated part,
10 Leveler,
11 rollers,
12 Shearing machine (cutting means),
13 Transport roller,
14, 15 blades,
16 belt conveyor,
17 belt conveyor (supply means),
18 guides,
19 Press roller.

Claims (5)

溶媒を含む電極材を金属箔の面に塗布し、前記電極材が連続的に塗布されてなる塗工部、および前記金属箔の面が露出されてなる未塗工部を形成する塗工工程と、
前記溶媒を蒸発させる乾燥工程と、
前記金属箔と相対移動するプレスローラーによって、前記塗工部と前記未塗工部との境に交わる交差方向に前記電極材をプレスするプレス工程と、を有する電極製造方法。 A coating process in which an electrode material containing a solvent is applied to the surface of the metal foil, and a coated part in which the electrode material is continuously applied and an uncoated part in which the surface of the metal foil is exposed When,
A drying step of evaporating the solvent;
An electrode manufacturing method comprising: a pressing step of pressing the electrode material in a crossing direction intersecting a boundary between the coated portion and the uncoated portion by a press roller that moves relative to the metal foil. 前記プレス工程に先立って、前記金属箔を切断する切断工程と、
前記プレスローラーに前記交差方向から前記金属箔を供給する供給工程と、を更に有する請求項１に記載の電極製造方法。 Prior to the pressing step, a cutting step of cutting the metal foil,
The electrode manufacturing method according to claim 1, further comprising a supplying step of supplying the metal foil from the intersecting direction to the press roller. 前記金属箔は長尺形状で、前記切断工程は、前記金属箔の短手方向の長さより短い幅で前記金属箔を切断することを特徴とする請求項２に記載の電極製造方法。   The electrode manufacturing method according to claim 2, wherein the metal foil has a long shape, and the cutting step cuts the metal foil with a width shorter than a length in a short direction of the metal foil. 前記塗工工程は、前記塗工部と前記塗工部との間に位置する前記未塗工部を少なくとも１つ形成することを特徴とする請求項１〜３のいずれか１項に記載の電極製造方法。   The said coating process forms at least one said uncoated part located between the said coating part and the said coating part, The any one of Claims 1-3 characterized by the above-mentioned. Electrode manufacturing method. 溶媒を含む電極材を金属箔の面に塗布し、前記電極材が連続的に塗布されてなる塗工部、および前記金属箔の面が露出されてなる未塗工部を形成する塗工手段と、
前記溶媒を蒸発させる乾燥手段と、
前記金属箔を切断する切断手段と、
前記金属箔と相対移動し、前記塗工部と前記未塗工部との境に交わる交差方向に前記電極材をプレスするプレスローラーと、
前記プレスローラーに前記交差方向から前記金属箔を供給する供給手段と、を有する電極製造装置。 Coating means for applying an electrode material containing a solvent to the surface of the metal foil, forming a coated portion where the electrode material is continuously applied, and an uncoated portion where the surface of the metal foil is exposed When,
Drying means for evaporating the solvent;
Cutting means for cutting the metal foil;
A press roller that moves relative to the metal foil and presses the electrode material in a crossing direction that intersects the boundary between the coated portion and the uncoated portion;
An electrode manufacturing apparatus comprising: supply means for supplying the metal foil from the intersecting direction to the press roller.
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