JP6032267B2 - Battery electrode sheet and manufacturing method thereof - Google Patents
Battery electrode sheet and manufacturing method thereof Download PDFInfo
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- JP6032267B2 JP6032267B2 JP2014256790A JP2014256790A JP6032267B2 JP 6032267 B2 JP6032267 B2 JP 6032267B2 JP 2014256790 A JP2014256790 A JP 2014256790A JP 2014256790 A JP2014256790 A JP 2014256790A JP 6032267 B2 JP6032267 B2 JP 6032267B2
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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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Description
本発明は、電池用電極シートとその製造方法に関する。 The present invention relates to a battery electrode sheet and a method for producing the same.
図９は、従来の巻回型電池の構造の一例を示す図である（特許文献１）。この図に示すように、巻回型電池は、一般に、正極活物質（正極合材層８）が形成されたシート状の正極と、セパレーター４と、負極活物質（負極合材層１０）が形成されたシート状の負極と、からなる。そして、負極及び正極の一方の端縁部における未塗工部（合材層未塗布部７，９）がそれぞれ逆方向にセパレーターから突出するように重ね合わせられた状態で巻回され、電池容器に収納されている。この電極の端縁部には、活物質（正極合材層及び負極合材層）が形成されていない「未塗工部（未塗布部７，８）」が設けられており、この部分に集電体（集電部材５，６）が溶接等され、電池容器の各端子に接続されている。 FIG. 9 is a diagram showing an example of the structure of a conventional wound battery (Patent Document 1). As shown in this figure, a wound battery generally has a sheet-like positive electrode on which a positive electrode active material (positive electrode mixture layer 8) is formed, a separator 4, and a negative electrode active material (negative electrode mixture layer 10). And a formed sheet-like negative electrode. Then, the uncoated portions (the unmixed material layer uncoated portions 7 and 9) at one edge portion of the negative electrode and the positive electrode are wound in a state of being overlapped so as to protrude from the separator in the opposite directions, and the battery container It is stored in. An “uncoated portion (uncoated portions 7 and 8)” in which no active material (positive electrode mixture layer and negative electrode mixture layer) is formed is provided at the edge portion of the electrode. A current collector (current collecting members 5 and 6) is welded or the like and connected to each terminal of the battery container.
この図の例は電極が扁平に巻回された「扁平型」の巻回型電池であるが、円筒状に巻回された「円筒型」も、両者は電極の巻回工程における巻き芯の形状が異なるだけであり、基本的な構造や製造方法はほぼ同様である（特許文献２）。 The example in this figure is a “flat” winding type battery in which the electrode is wound flatly. However, both of the “cylindrical type” wound in the cylindrical shape are the cores in the electrode winding process. Only the shape is different, and the basic structure and manufacturing method are almost the same (Patent Document 2).
電極シートは、シート状の薄い金属箔（フィルム）の表面に活物質を塗工して、その上からプレス機等によって圧力を加える工程を経て得られることが一般的である。このような製造方法によって得られる電極シートにおける構造上の問題点の一つは、電極シートが湾曲することである。”湾曲”は、主に、電極シートに張力（テンション）を加えない状態で生じるものであり、例えば、電極シートに張力を加え続けていれば、湾曲は生じにくい。 The electrode sheet is generally obtained through a process of applying an active material on the surface of a sheet-like thin metal foil (film) and applying pressure from the top with a press machine or the like. One of the structural problems in the electrode sheet obtained by such a manufacturing method is that the electrode sheet is curved. The “curvature” is mainly generated in a state where no tension (tension) is applied to the electrode sheet. For example, if tension is continuously applied to the electrode sheet, the curve is hardly generated.
しかし、装置を停止した際など、張力が加えられなくなると湾曲の問題が生じうる。湾曲した電極シートを巻回すると、巻きずれ等の工程上の不具合を発生し易い。通常、巻回型電池の電極製造工程では、ロールプレス機により正極及び負極それぞれの活物質層の圧延した後、巻回装置に送られ、ここでセパレーターを挟み込み、正負の電極シートが重ねられた状態で巻回される。電極シートが湾曲したままでは巻回装置に挿入する際の位置精度が確保できず、歪んだり曲がったりした状態で挿入され、正しく巻回することができない。 However, if tension is no longer applied, such as when the device is stopped, bending problems can occur. When a curved electrode sheet is wound, defects in the process such as winding deviation are likely to occur. Usually, in the electrode manufacturing process of a wound battery, after the active material layer of each of the positive electrode and the negative electrode is rolled by a roll press machine, it is sent to a winding device, where the separator is sandwiched and the positive and negative electrode sheets are stacked. It is wound in a state. If the electrode sheet is curved, the positional accuracy when inserting into the winding device cannot be ensured, and the electrode sheet is inserted in a distorted or bent state and cannot be wound correctly.
湾曲した電極シートを注意深く観察すると、湾曲は電極シートの端縁部における活物質層の未塗工部と塗工部との長さの差で発生することが分かる。これは、正極及び負極それぞれの活物質層のプレスによって活物質層は圧延（延伸）されるのに対して未塗工部は圧延されないため、塗工部と未塗工部に「伸び量」の差が発生するためと考えられる。本件発明者らによる実験では、活物質層の圧延前を１００とした場合の塗工部の伸び率は１００．３４６％、未塗工部の伸び率は１００．０３１％であった。 When the curved electrode sheet is carefully observed, it can be seen that the bending is caused by the difference in length between the uncoated portion and the coated portion of the active material layer at the edge of the electrode sheet. This is because the active material layer is rolled (stretched) by pressing the active material layer of each of the positive electrode and the negative electrode, whereas the uncoated part is not rolled, so the “elongation amount” is applied to the coated part and the uncoated part. This is thought to be due to the difference between the two. In the experiments by the present inventors, the elongation percentage of the coated part was 100.346%, and the elongation percentage of the uncoated part was 100.031% when the active material layer before rolling was assumed to be 100.
この対策として、未塗工部も圧延を行うことが考えられるが、未塗工部を一律に圧延すると圧延時にずれが発生し所定位置をプレスできなくなる問題がある。逆に、小さい荷重でプレスを行うと電極シートの未塗工部の特に長手方向にシワ及び／又は亀裂が生じる上、湾曲も小さくならない。また、未塗工部と塗工部を同時に圧延する為には、プレス機のロール面に電極プレス部の凹部を形成する必要があり、厚みの異なる電極をプレスする際には、厚みに応じた凹みを形成したロールを用意する必要があった。 As a countermeasure, it is conceivable that the uncoated portion is also rolled. However, when the uncoated portion is uniformly rolled, there is a problem in that a deviation occurs during rolling and a predetermined position cannot be pressed. On the other hand, when pressing is performed with a small load, wrinkles and / or cracks occur in the longitudinal direction of the uncoated part of the electrode sheet, and the curvature does not decrease. Moreover, in order to roll an uncoated part and a coated part simultaneously, it is necessary to form the recessed part of an electrode press part on the roll surface of a press, and when pressing the electrode from which thickness differs, according to thickness It was necessary to prepare a roll having a dent.
また、特許文献３記載のように未塗工部に間欠的に切り込み等を入れる方法も考えられるが、その場合、電極シートの引っ張り強度が低下するなどの問題も発生する。また、一定の張力を加えて巻きとりを行う一般的な巻き取り方式を採用すると、電極シートの走行方向に強い「巻き取り張力」を加えられたまま高速かつ連続的に電極シートの圧延工程が行われる。塗工部への荷重が大きく湾曲が大きい場合、電極のゆがみによるシワや亀裂が発生し易い。このように湾曲が大きい電極シートは製造工程を頻繁に停止させ、人手を介して不具合の修正等を行うことが必要になる。 In addition, as described in Patent Document 3, a method of intermittently cutting the uncoated portion may be considered, but in that case, a problem such as a decrease in the tensile strength of the electrode sheet also occurs. In addition, when a general winding method in which winding is performed by applying a constant tension is adopted, the rolling process of the electrode sheet can be performed continuously at a high speed while applying a strong “winding tension” in the traveling direction of the electrode sheet. Done. When the load on the coating part is large and the curve is large, wrinkles and cracks due to electrode distortion are likely to occur. Such an electrode sheet having a large curvature needs to frequently stop the manufacturing process and correct a defect through manual operation.
本発明は、かかる実情に鑑みてなされたものであって、その目的の一つは、湾曲の少ない電池用の電極シート及びその製造方法等を提供することにある。 The present invention has been made in view of such circumstances, and one of its purposes is to provide an electrode sheet for a battery with a small curvature, a method for manufacturing the same, and the like.
本発明に係る電極シートは、シート状の金属薄膜を少なくとも表面に有する電極シートであって、その中央部に圧延された活物質層を有すると共にその端縁部に前記活物質層の未塗工部を有し、前記未塗工部の少なくとも一部に延伸部が設けられていることを特徴とする。 An electrode sheet according to the present invention is an electrode sheet having a sheet-like metal thin film on at least a surface thereof, and has an active material layer rolled at the center portion thereof, and an uncoated portion of the active material layer at an edge portion thereof And at least a part of the uncoated part is provided with an extending part.
本発明に係る電極シートの製造方法は、電極シートの中央部に活物質層の塗工部が形成され、前記電極シートの端縁部に活物質層の未塗工部を有する電極シートに対して、前記未塗工部の一部をプレスすることで延伸部を形成する工程と、前記塗工部を圧延する工程とを含むことを特徴とする。 The electrode sheet manufacturing method according to the present invention is an electrode sheet in which an active material layer coated part is formed in the center part of the electrode sheet, and an active material layer uncoated part is provided at an edge of the electrode sheet. And the process of forming an extending | stretching part by pressing a part of said uncoated part, and the process of rolling the said coated part are characterized by the above-mentioned.
上記の製造方法においては、塗工部を圧延するステップは、未塗工部に延伸部を形成するステップの前又は後に、行うことができる。 In the above manufacturing method, the step of rolling the coated portion can be performed before or after the step of forming the stretched portion in the uncoated portion.
本発明によると、活物質層の未塗工部に延伸部が設けられることにより歪みが緩和されるため、湾曲の小さい電極シートが得られる。そのため、張力を加えて電極シートを巻回する際や電極シートを次工程に送り出す際にも、電極シートの特に長手方向にシワや亀裂が発生しにくいという効果を奏する。この理由の一つは、延伸部によって長手方向とは異なる方向に張力が伝わることで、シワを発生させる力が分散されるためである。電極シートの特に長手方向にシワが発生するメカニズムは未塗工部をプレスする際に少なからずプレスできない箇所が発生することに起因すると考えられる。この知見は、本件発明者らによって初めて見出されたものであり、予期し得なかった効果である。 According to the present invention, since an extension part is provided in an uncoated part of an active material layer, distortion is relieved, and thus an electrode sheet having a small curvature is obtained. Therefore, there is an effect that wrinkles and cracks are less likely to occur in the longitudinal direction of the electrode sheet, especially when the electrode sheet is wound by applying tension or when the electrode sheet is sent to the next process. One reason for this is that the tension is transmitted in a direction different from the longitudinal direction by the stretched portion, thereby dispersing the force that generates wrinkles. It is thought that the mechanism that wrinkles are generated in the longitudinal direction of the electrode sheet is caused by the occurrence of a portion that cannot be pressed when the uncoated portion is pressed. This finding was found for the first time by the present inventors and was an unexpected effect.
また、その製造方法としても、例えば既存のテンションコントロールプレスシステム等に組み込むことができるため、製造工程が大幅に増えるということもなく、高速に製造することができる利点がある。 In addition, since the manufacturing method can be incorporated into, for example, an existing tension control press system, there is an advantage that the manufacturing process can be performed at high speed without greatly increasing the number of manufacturing steps.
以下、本発明の実施態様について説明するが、これらの説明は本発明に限定的な解釈を与えるものではない。なお、図面において、同一又は同種の部材には同一の符号を用いるものとする。 Hereinafter, embodiments of the present invention will be described, but these descriptions do not give a limited interpretation to the present invention. In the drawings, the same reference numerals are used for the same or similar members.
（第１の実施形態）−巻回型電池用電極シート−
図１は、第１の実施形態の巻回型電池用電極シートの構造を示す図である。この図に示すように、電極シート３０は、シート状の金属箔からなる電極シートの少なくとも一の端縁部を除く全面に活物質層Ｐが圧延されてなる。そして、この端縁部における未塗工部Ｕに略矩形状、例えば、略台形状の延伸部２４ａを電極シートの長手方向に間欠的に設けられている。延伸部２４ａは例えば後述する間欠ロールプレス機等によって形成され、加圧によって金属箔が延伸されて得られるものである。未塗工部Ｕは、活物質層Ｐの圧延方向に沿って設けられる。
(First embodiment) -Electrode sheet for wound battery-
FIG. 1 is a diagram illustrating a structure of a wound battery electrode sheet according to the first embodiment. As shown in this figure, the electrode sheet 30 is obtained by rolling an active material layer P on the entire surface excluding at least one edge portion of an electrode sheet made of a sheet-like metal foil. And in the uncoated part U in this edge part, the substantially rectangular-shaped, for example, substantially trapezoid-shaped extending | stretching part 24a is intermittently provided in the longitudinal direction of the electrode sheet. The extending portion 24a is formed by, for example, an intermittent roll press machine described later, and is obtained by extending a metal foil by pressurization. The uncoated portion U is provided along the rolling direction of the active material layer P.
電極シート３０はシート状の金属薄膜を少なくとも表面に有するものであればよい。金属薄膜には、金属箔はもちろん、例えば、金属でコーティングされた樹脂性のフィルム等も含まれる。また、「電極シートの少なくとも一の端縁部を除く全面」とは、電極シートの中央部に圧延された活物質層を有し、電極シートの端縁部に活物質層の未塗工部を有することを意味する。 The electrode sheet 30 should just have a sheet-like metal thin film at least on the surface. The metal thin film includes not only a metal foil but also a resinous film coated with a metal, for example. In addition, “the entire surface excluding at least one edge portion of the electrode sheet” means that the active material layer is rolled at the center portion of the electrode sheet, and the active material layer is not applied to the edge portion of the electrode sheet. It means having.
図１において、延伸部２４ａは、間欠的に設けられている態様を示したが、必ずしも間欠的である必要はなく、少なくとも一部に設けられていれば良い。ただし、間欠的であると、ローラー等により一定の張力を加えながら搬送する製造システムに組み込むことが容易になり、しかもその場合に、電極シートの搬送方向とは異なる方向に電極シートが位置ずれしたとしても、非加圧状態時に一定の張力によって自然に修正される利点がある。 In FIG. 1, the extending portion 24 a is shown as being provided intermittently, but is not necessarily intermittent and may be provided at least partially. However, if it is intermittent, it becomes easy to incorporate into a manufacturing system that conveys while applying a constant tension by a roller or the like, and in that case, the electrode sheet is displaced in a direction different from the conveying direction of the electrode sheet. However, there is an advantage that it is naturally corrected by a constant tension in a non-pressurized state.
図１では、延伸部の形状として、塗工部側を上に見たとき逆台形状となる例を示したが、加圧した際に伸び量の差を吸収するように、電極シートの金属箔を予め部分的に加圧して延伸させておくことで、湾曲の原因となる歪みを効果的に吸収することができるものであれば、どのような形状でも良い。例えば、図１に破線で示したように、矩形状の角部が丸められた形状であってもよい。このように矩形状の角部を丸めることで、長手方向とは異なる方向、特に長手方向に直交する方向に張力が伝わりやすくなるため、張力を加えた際に生じる長手方向のシワや亀裂の発生が抑えられ、また角部付近でシワや亀裂或いはキズの発生も抑えられるからである。さらに、各延伸部は必ずしも図１に示すように互いに独立している必要はなく、例えば端部が全てプレスされている場合など、各延伸部同士が電極シートの端部において長手方向につながっていてもよい。 In FIG. 1, as an example of the shape of the stretched portion, an example of an inverted trapezoidal shape when viewed from the top of the coated portion is shown. Any shape may be used as long as the foil can be partially pressed and stretched in advance to effectively absorb the strain that causes the bending. For example, as shown by a broken line in FIG. 1, a rectangular corner may be rounded. By rounding the corners of the rectangular shape in this way, tension is easily transmitted in a direction different from the longitudinal direction, particularly in a direction perpendicular to the longitudinal direction, and therefore generation of longitudinal wrinkles and cracks that occur when tension is applied. This is because the occurrence of wrinkles, cracks and scratches near the corners is also suppressed. Further, the stretched portions do not necessarily have to be independent from each other as shown in FIG. 1. For example, when all the end portions are pressed, the stretched portions are connected in the longitudinal direction at the end portions of the electrode sheet. May be.
このように、活物質層の未塗工部に延伸部を部分的に具備することで活物質層を圧延する際に発生する塗工部と未塗工部の加圧による「伸び量」の差が小さくなり、湾曲量を小さくすることができ、未塗工部の連続加圧によって生じる圧延ずれを防止することができる。 As described above, the “elongation amount” of the coated portion and the uncoated portion generated when the active material layer is rolled by partially including the stretched portion in the uncoated portion of the active material layer. The difference is reduced, the amount of bending can be reduced, and rolling deviation caused by continuous pressurization of the uncoated portion can be prevented.
ただし、図１に示すように、延伸部は未塗工部の「一部」に設けられることが必要であり、典型的には、間欠的に延伸部が設けられていれば良いが、そのような態様に限られない。また、延伸部の大きさは図１に示すものよりももっと大きくてもよい。この理由は、未塗工部の一部に延伸部を設ければ、それ以外の部分には延伸されない未加圧部２５が形成されることになり、未加圧部２５によって効果的に歪みを緩和することができるからである。未加圧部２５を形成する方法は種々考えられ、既に述べたように、電極シートの長手方向に所定の間隔ずつ延伸部を配置すれば足りるが、幅方向すなわち延伸部と塗工部との境界部に延伸部が形成されない未加圧部２５ｂが形成されることは差し支えない。 However, as shown in FIG. 1, the stretched portion needs to be provided in a “part” of the uncoated portion, and typically, the stretched portion may be provided intermittently. It is not restricted to such an aspect. Further, the size of the stretched portion may be larger than that shown in FIG. The reason for this is that if a stretched part is provided in a part of the uncoated part, an unpressurized part 25 that is not stretched is formed in the other part. It is because it can be eased. Various methods for forming the non-pressurized portion 25 are conceivable. As described above, it is sufficient to arrange the extending portions at predetermined intervals in the longitudinal direction of the electrode sheet, but the width direction, that is, between the extending portion and the coating portion is sufficient. The unpressurized part 25b in which the extending part is not formed at the boundary part may be formed.
なお、電極シートの延伸部は、少なくとも電極シートの片面側にのみ設けられていれば十分である。第１の実施形態で示した構成でも、十分に歪みが緩和されて湾曲量を小さくすることができるからである。もちろん、両面側に延伸部を設ければそれだけ歪みを緩和する部分が増大するのでこの場合も同様に湾曲量を小さくできることはいうまでもない。 In addition, it is sufficient if the extending | stretching part of an electrode sheet is provided only at least on the single side | surface side of the electrode sheet. This is because even in the configuration shown in the first embodiment, the distortion can be sufficiently relaxed and the bending amount can be reduced. Of course, if extending portions are provided on both sides, the amount of distortion is increased accordingly, so it goes without saying that the amount of bending can be reduced in this case as well.
電極シート３０は、非多孔性であっても、多孔性であってもよい。電池の種類によっては電極シートにいわゆるパンチングメタルと呼ばれる多孔性の鋼板等が用いられることもあるが、その場合、未塗工部の少なくとも一部に延伸部を設けるためにはより強い力で加圧することが必要になる。このため、延伸部を容易に形成するという観点からは、電極シートは穿孔のない非多孔性の金属箔が好ましい。具体的には、前記電極シートの材質はアルミニウム又は銅などが挙げられる。 The electrode sheet 30 may be non-porous or porous. Depending on the type of battery, a porous steel plate called so-called punching metal may be used for the electrode sheet, but in that case, it is necessary to apply a stronger force in order to provide the stretched part at least in a part of the uncoated part. It is necessary to press. For this reason, from the viewpoint of easily forming the stretched portion, the electrode sheet is preferably a non-porous metal foil without perforation. Specifically, examples of the material for the electrode sheet include aluminum and copper.
負極電極シートの基材として銅箔を用いる場合、厚さ７〜１５μｍ程度、例えば１０μｍとする。正極電極シートの基材としてアルミニウム箔を用いる場合、１０μｍ〜２５μｍ程度、例えば２０μｍとする。 When copper foil is used as the base material of the negative electrode sheet, the thickness is about 7 to 15 μm, for example, 10 μm. When an aluminum foil is used as the base material of the positive electrode sheet, the thickness is about 10 μm to 25 μm, for example, 20 μm.
延伸部の深さは電極シートの基材となる金属箔の厚さ等で変わりうるが、例えば負極電極シートとして１０μｍの銅箔を用いた場合、延伸部の深さは０．０３μｍとし、厚みは０．９７μｍとする。 The depth of the stretched portion may vary depending on the thickness of the metal foil serving as the base material of the electrode sheet. For example, when a 10 μm copper foil is used as the negative electrode sheet, the depth of the stretched portion is 0.03 μm and the thickness Is 0.97 μm.
延伸部の形状は、略矩形状であれば一定の効果を奏すると考えられるが、中でも略台形状、特に、図１に示すように塗工部側を上に見たとき略逆台形状であってもよい。この理由は、未塗工部端部と塗工部端部（未塗工部と塗工部の境界部近傍）とで伸び量を異ならせておくことで塗工部を圧延する工程で伸び量の差が徐々に小さくなり、シワが形成されにくくなるためである。また、延伸部と活物質層Ｐとの間に延伸部が形成されない未加圧部２５が形成されていることは差し支えない。 If the shape of the stretched portion is substantially rectangular, it is considered that there is a certain effect, but in particular, it is substantially trapezoidal, especially when the coated portion side is viewed upward as shown in FIG. There may be. The reason for this is that the elongation is different in the rolling process of the coated part by differently extending the uncoated part end and the coated part end (near the boundary between the uncoated part and the coated part). This is because the difference in amount gradually decreases and wrinkles are hardly formed. Further, it is possible that an unpressurized portion 25 in which no stretched portion is formed is formed between the stretched portion and the active material layer P.
以上のように、電極シート３０の未塗工部Ｕに一定の間隔ごとに延伸部を形成することで、電極シート全体としての湾曲量を小さくすることができる。 As described above, the amount of bending of the entire electrode sheet can be reduced by forming the extending portions at regular intervals in the uncoated portion U of the electrode sheet 30.
なお、実施形態１では、巻回型電池用の電極シートの例を説明したが、未塗工部を有し、かつ活物質層を圧延する必要がある電極シートであれば、巻回型電池用でなくてもよい。なぜなら、活物質層を圧延する以上、電極シートの伸び量の差が生じるため、湾曲防止或いはプレス時の位置ずれを防ぐといった効果が得られるからである。 In the first embodiment, the example of the electrode sheet for the wound battery has been described. However, if the electrode sheet has an uncoated portion and the active material layer needs to be rolled, the wound battery is used. It does not have to be for. This is because, as long as the active material layer is rolled, a difference in the amount of elongation of the electrode sheet occurs, so that an effect of preventing bending or preventing displacement during pressing can be obtained.
（第２の実施形態）−巻回型電池用電極シートの製造方法−
次に、第１の実施形態の電極シートの製造方法についての実施態様を一例として説明する。
Second Embodiment-Method for Producing a Winding Battery Electrode Sheet-
Next, the aspect about the manufacturing method of the electrode sheet of 1st Embodiment is demonstrated as an example.
図５は、巻回型電池用電極シートを製造するための大まかな手順を示している。先ず、シート状の金属箔からなる電極シートにペースト状の活物質層を塗布する（ステップＳ１）。またステップＳ１とほぼ同時に電極シートに活物質層の未塗工部が形成される（ステップＳ２）。第３のステップでは、未塗工部を間欠的にプレスすることにより矩形状の延伸部を略等間隔に形成する（ステップＳ３）。最後に、活物質層を圧延するステップＳ４を含むことを特徴とする（ステップＳ４）。 FIG. 5 shows a rough procedure for manufacturing a wound battery electrode sheet. First, a paste-like active material layer is applied to an electrode sheet made of a sheet-like metal foil (step S1). Further, an uncoated portion of the active material layer is formed on the electrode sheet almost simultaneously with step S1 (step S2). In the third step, rectangular extending portions are formed at substantially equal intervals by intermittently pressing the uncoated portion (step S3). Finally, it is characterized by including step S4 which rolls an active material layer (step S4).
なお、ステップＳ１及びステップＳ２を省略して、予めペースト状の活物質層が塗布され、塗工部と未塗工部とが形成された電極シートを準備してステップＳ３からスタートしてもよい。 Note that step S1 and step S2 may be omitted, and an electrode sheet on which a paste-like active material layer has been applied in advance to form a coated part and an uncoated part may be prepared, and the process may start from step S3. .
図２（ａ）は、巻回型電池用電極シートのプレスの製造装置を示している。この装置は、テンションローラーと荷重計により電極シートに加えるテンション（引っ張り張力）を制御することで巻き取り速度を制御するテンションコントロールプレスシステム２０である。ロール状に巻かれた電極シートの基材となるシート状の金属箔Ｓが、テンションローラーによって所定の荷重を加えられながら走行方向Ｘに向けて走行する。シート状の金属箔Ｓは、間欠ロールプレス機２１を通過して未塗工部Ｕに延伸部（加圧痕）が形成される。次に、主ロールプレス機２２に送られ、ここで活物質の圧延が行われる。 FIG. 2A shows an apparatus for manufacturing a press for an electrode sheet for a wound battery. This apparatus is a tension control press system 20 that controls a winding speed by controlling a tension (tensile tension) applied to an electrode sheet by a tension roller and a load meter. A sheet-like metal foil S serving as a base material for the electrode sheet wound in a roll shape travels in the traveling direction X while a predetermined load is applied by the tension roller. The sheet-like metal foil S passes through the intermittent roll press machine 21, and stretched portions (pressed marks) are formed in the uncoated portion U. Next, it is sent to the main roll press machine 22 where the active material is rolled.
図２（ｂ）は、間欠ロールプレス機２１の構成を示す図である。この図に示すように、間欠ロールプレス機２１の凸ロール２１Ａには、活物質層Ｐの未塗工部Ｕを加圧して延伸部を形成するための加圧部２３が、一定間隔ごとに設けられている。この加圧部２３は、電極シートの両端縁部に設けられた略矩形状の凸部であり、受けロール２１Ｂが凸ロール２１Ａと共に回転することで電極シートが順方向に送り出される。そして、シート状の金属箔Ｓが間欠ロールプレス機２１を通過することにより、シート状の金属箔Ｓの未塗工部Ｕに略矩形状の延伸部２４が形成される。 FIG. 2B is a diagram showing a configuration of the intermittent roll press 21. As shown in this figure, the convex roll 21A of the intermittent roll press 21 has a pressurizing part 23 for pressurizing the uncoated part U of the active material layer P to form stretched parts at regular intervals. Is provided. This pressurization part 23 is a substantially rectangular convex part provided in the both-ends edge part of the electrode sheet, and an electrode sheet is sent out to a forward direction because the receiving roll 21B rotates with the convex roll 21A. Then, when the sheet-like metal foil S passes through the intermittent roll press 21, a substantially rectangular extending portion 24 is formed in the uncoated part U of the sheet-like metal foil S.
このように電極シートの未塗工部を加圧するための加圧部は、例えばロールに凸加工を施した凸ロールと凸部を受ける受けロールとによって構成され、これらのロールが回転することによって電極シートの未塗工部に延伸部が形成される。これにより、高速な加工工程を実現できる。 Thus, the pressurization part for pressurizing the uncoated part of an electrode sheet is comprised by the convex roll which gave the convex process to the roll, and the receiving roll which receives a convex part, for example, and these rolls rotate. An extended part is formed in the uncoated part of the electrode sheet. Thereby, a high-speed machining process can be realized.
なお、テンションローラーは、通常、主ロールプレス機２２の前後に設けられるものであり、所定のテンションで電極シートを送り出す機構と、引っ張る機構と電極シートを巻き取る機構とを有するものである。 The tension roller is usually provided before and after the main roll press 22 and has a mechanism for feeding the electrode sheet with a predetermined tension, a mechanism for pulling, and a mechanism for winding the electrode sheet.
一般に、二つのプレス装置を用いて電極シートを連続的に処理する場合においては、前段のプレス装置の出口において電極シートの位置がずれると後段のプレス装置には位置ズレが生じたまま送り込まれることとなるという問題（いわゆる圧延ずれの問題）が生ずる。これは、電極シートは二つのプレス装置によって常時加圧されているため、プレス装置間の電極シートの位置や走行方向を修正することは極めて困難であった。しかし、本実施形態のように一方のプレス工程が間欠的であるため、加圧状態と非加圧状態とが存在することとなる。そのため、走行方向Ｘがずれた場合には、電極シートに加えられるテンションを高めることによって非加圧状態のときに予定された方向に修正することができる。したがって、電極シートの位置ずれを容易に解消することができ、その結果歩留まりが向上して製造コストが下げられる。
In general, when an electrode sheet is continuously processed using two pressing devices, if the position of the electrode sheet is shifted at the outlet of the preceding press device, the subsequent press device is fed with a misalignment. and Do Rutoi cormorant problem (the so-called rolling displacement of the problem) occurs. This is because it is extremely difficult to correct the position and traveling direction of the electrode sheet between the pressing devices because the electrode sheet is constantly pressurized by the two pressing devices. However, since one press process is intermittent like this embodiment, a pressurization state and a non-pressurization state will exist. Therefore, when the traveling direction X deviates, it can be corrected to the direction planned in the non-pressurized state by increasing the tension applied to the electrode sheet. Therefore, the positional deviation of the electrode sheet can be easily eliminated, and as a result, the yield is improved and the manufacturing cost is reduced.
図３は、間欠ロールプレス機２１の構成を示す拡大図である。この図に示すように、間欠ロールプレス機２１は、加圧部２３が設けられた凸ロール２１Ａと、これを受ける受けロール２１Ｂとが対向して設けられている。 FIG. 3 is an enlarged view showing the configuration of the intermittent roll press 21. As shown in this figure, the intermittent roll press 21 is provided with a convex roll 21A provided with a pressurizing unit 23 and a receiving roll 21B that receives the convex roll 21A.
そして、間欠ロールプレス機２１を通過した後に、シート状の金属箔Ｓは主ロールプレス機に送られ、活物質層Ｐが圧延される。従来であれば、この圧延工程の際に活物質層の塗工部と未塗工部とで伸び量が異なるために歪が発生し、電極シートが湾曲するが、間欠ロールプレス機２１により未塗工部に予め伸び量の差を吸収するための延伸部が設けられるため、歪が緩和されて湾曲量が小さくなる。 And after passing the intermittent roll press machine 21, the sheet-like metal foil S is sent to the main roll press machine, and the active material layer P is rolled. Conventionally, during the rolling process, the active material layer is coated with an uncoated portion and the elongation amount is different, resulting in distortion and bending of the electrode sheet. Since the extending portion for absorbing the difference in elongation amount is provided in advance in the coating portion, the strain is reduced and the bending amount is reduced.
主ロールプレス機２２を通過した後は、電極シートが巻き取られ、図４の一点鎖線に沿って半分に裁断されるとともに、適切な寸法に裁断される。その後、正極用の電極シートと負極用の電極シートとセパレーターとがいずれも巻回装置に送られる。 After passing through the main roll press 22, the electrode sheet is wound up and cut in half along the one-dot chain line in FIG. 4 and cut into appropriate dimensions. Thereafter, the positive electrode sheet, the negative electrode sheet, and the separator are all sent to a winding device.
なお、ステップＳ３とステップＳ４の順序を逆にしても良い。特に、活物質層の圧延工程（Ｓ４）と未塗工部のプレス工程（Ｓ３）との間に、巻き取り工程を実施する場合、ステップＳ４を先に実施することが好ましい。この理由は、未塗工部のプレス工程を先に実施すると、未塗工部のみが伸びた状態で巻き取る必要があり、塗工部をきれいに巻き取ることができないと共に、巻き取った電極シートの体積が増大する原因にもなるからである。ステップＳ４とステップＳ３との間に巻き取り工程を行う場合は、連続的な工程ではなくなるため、一方の工程までで中断しても他方の工程を中断したりプレス速度を等しくしたりする必要がないというメリットがある。ただし、工程が一つ増えるデメリットもあるため、リードタイムを減らすという観点においては、ステップＳ３とステップＳ４を連続工程で実施することが好ましい。 Note that the order of step S3 and step S4 may be reversed. In particular, when the winding process is performed between the rolling process (S4) of the active material layer and the pressing process (S3) of the uncoated part, it is preferable to perform step S4 first. The reason for this is that if the uncoated part is pressed first, it is necessary to wind only the uncoated part in a stretched state, and the coated part cannot be taken up neatly, and the wound electrode sheet It is also because it causes the volume of the to increase. When the winding process is performed between step S4 and step S3, it is not a continuous process, so it is necessary to interrupt the other process or equalize the press speed even if interrupted up to one process. There is no merit. However, since there is a disadvantage that one process is added, it is preferable that Step S3 and Step S4 are performed in a continuous process from the viewpoint of reducing the lead time.
上記ステップＳ１〜Ｓ４を実施して正極電極シート及び負極電極シートをそれぞれ形成した後、巻回装置に送り、ここでセパレーターを挟み込んで巻回することで電池が形成されていく。正極及び負極のそれぞれについて集電電極を形成し、電池筐体に挿入し、密閉することで巻回型電池が完成する。複数の電極シートを一度に製造する場合は巻回装置に送る前に電極シートを裁断する工程が必要となる。 After carrying out the above steps S1 to S4 to form the positive electrode sheet and the negative electrode sheet, respectively, the battery is formed by feeding it to a winding device and sandwiching and winding the separator here. A current collecting electrode is formed for each of the positive electrode and the negative electrode, inserted into the battery case, and sealed to complete a wound battery. In the case of producing a plurality of electrode sheets at once, a step of cutting the electrode sheets is required before sending them to the winding device.
図４（ａ）及び（ｂ）は、いずれも延伸部の形状を示している。図４（ａ）のように、略矩形状であってもよいが、この図のように略台形状、特に、図４（ｂ）のように塗工部側を上に見たとき略逆台形状であってもよい。或いは、図４（ｂ）において破線で示したように、略矩形状の角部が丸められた延伸部２４ｂのような形状でもよい。また、角部の曲率はこの図に示すものに限らない。延伸部２４ａ，２４ｂが間欠的に設けられていると、隣接する延伸部間には、延伸されない未加圧部２５が形成されることになり、未加圧部２５によって効果的に歪みを緩和することができる。なお、上述のとおり、製造上の都合等により幅方向すなわち延伸部と塗工部（活物質層Ｐ）との境界部との間に未加圧部２５ｂが形成されていてもよい。電極シートは巻き取られた後、図中の一点鎖線に沿って裁断され、電池用電極シートの大きさに裁断されて完成する。 4 (a) and 4 (b) both show the shape of the stretched portion. Although it may be substantially rectangular as shown in FIG. 4 (a), it is substantially trapezoidal as shown in this figure, particularly when the coating part side is viewed upward as shown in FIG. 4 (b). It may be trapezoidal. Alternatively, as shown by a broken line in FIG. 4B, a shape such as an extended portion 24b in which a substantially rectangular corner is rounded may be used. Further, the curvature of the corner is not limited to that shown in this figure. When the extending portions 24a and 24b are provided intermittently, an unpressurized portion 25 that is not stretched is formed between adjacent extending portions, and the unpressurized portion 25 effectively relieves strain. can do. Note that as described above, the unpressurized portion 25b may be formed in the width direction, that is, between the stretched portion and the boundary portion between the coated portion (active material layer P) for the convenience of manufacture. After the electrode sheet is wound up, it is cut along the alternate long and short dash line in the figure, and cut into the size of the battery electrode sheet to complete.
図６は１枚のシート状の金属箔Ｓに３列の活物質層Ｐの塗工部を設けた実施態様を示している。間欠ロールプレス機２１で未塗工部Ｕに矩形状乃至台形状の延伸部２４ａが間欠的に形成した後、主ロールプレス機２２で活物質層Ｐを圧延する。このような大面積の電極シートであっても間欠ロールプレス機２１により形成される延伸部によって歪が適切に緩和され、湾曲量を小さくすることができる。そのため、大量生産によって製造効率を飛躍的に高めることができる。 FIG. 6 shows an embodiment in which three sheets of active material layer P coating portions are provided on one sheet-like metal foil S. FIG. After the rectangular or trapezoidal extending portion 24a is intermittently formed in the uncoated portion U by the intermittent roll press machine 21, the active material layer P is rolled by the main roll press machine 22. Even in the case of such an electrode sheet having a large area, the stretching portion formed by the intermittent roll press 21 can appropriately relieve the strain and reduce the amount of bending. Therefore, manufacturing efficiency can be dramatically increased by mass production.
主ロールプレス機２２及び間欠ロールプレス機２２の各ローラーの直径はプレス線圧を決定するため重要である。本件発明者らは、種々の実験により、プレス線圧と湾曲量の関係を調査検討した。 The diameter of each roller of the main roll press machine 22 and the intermittent roll press machine 22 is important for determining the press linear pressure. The present inventors investigated and examined the relationship between the press line pressure and the bending amount by various experiments.
図７は、湾曲量の測定方法の一例を説明するための図である。この測定方法は、活物質層Ｐを圧延した後、所定の寸法に裁断した電極シート３０を示している。湾曲量を測定するために電極シート３０の一端（一辺）を固定具３１で固定した状態で、他端（一辺）側に８５０ｇの錘等を吊り下げて荷重を加える。その状態で、図のように１ｍの金尺３２をあて、中央部で最も湾曲量が大きくなるようにして、その湾曲量を計測する。 FIG. 7 is a diagram for explaining an example of a bending amount measurement method. This measuring method shows an electrode sheet 30 that is rolled into a predetermined dimension after the active material layer P is rolled. In order to measure the amount of bending, with one end (one side) of the electrode sheet 30 fixed by the fixture 31, a weight of 850 g is suspended from the other end (one side) and a load is applied. In this state, a bending amount of 1 m is applied as shown in the figure, and the amount of bending is measured so that the amount of bending becomes maximum at the center.
ロールプレス機は一般にローラーの直径が小さいほど延伸部を形成するために必要な圧力は小さくなるが、あまり直径が小さいと軸部の強度が不足する問題もある。実験で用いた間欠ロールプレス機２１（図３)における凸ロール２１Ａの直径は凸部同士で約１２０ｍｍφ、凹部で約１１８ｍｍφであり、ゆえに加圧部の凸部の高さは１ｍｍに設定されたものを使用した。また、主ロールプレス機の直径は３００ｍｍφのものを使用し、線圧８００ｋｇｆ／ｃｍ2とした。 In general, the roll press machine has a smaller pressure required to form the stretched portion as the roller diameter is smaller. However, if the diameter is too small, there is a problem that the strength of the shaft portion is insufficient. The diameter of the convex roll 21A in the intermittent roll press 21 (FIG. 3) used in the experiment was about 120 mmφ between the convex portions and about 118 mmφ at the concave portions, and therefore the height of the convex portion of the pressing portion was set to 1 mm. I used something. The diameter of the main roll press was 300 mmφ, and the linear pressure was 800 kgf / cm 2 .
図８は、間欠ロールプレス機の線圧と湾曲量の関係を示す図である。ここでは、主ロールプレス機の線圧が８００ｋｇｆ／ｃｍ2とした場合に、間欠ロールプレス機に加えた線圧と、その結果得られた電極シート３０の湾曲量の関係を調べた。その結果、延伸部を設けない場合の湾曲量が４．５ｍｍであったところ、線圧を増加させるにつれて湾曲量がほぼ直線的に小さくなり、３００ｋｇｆ／ｃｍ2加えた時点で湾曲量が０ｍｍとなった。このとき、未塗工部の伸び量は未塗工部の幅に対して０．３１％であった。そして、湾曲が０の電極シートはそれまで肉眼で観察できた未塗工部のシワが見られなくなった。この実験における間欠ロールプレス機の加圧部の形状は図４（ｂ）に示すような逆台形形状とし、シート状の金属箔Ｓの巻き取り速度は、分速２０ｍ以上、そのときシート状の金属箔Ｓに加えたテンションは１０Ｎ〜６０Ｎ程度とした。特に、２０Ｎ〜３０Ｎ程度のときに良好な結果が得られた。逆に、テンションが６０Ｎを越えると縦方向（電極シートの走行方向）にシワが発生した。 FIG. 8 is a diagram showing the relationship between the linear pressure and the bending amount of the intermittent roll press. Here, the relationship between the linear pressure applied to the intermittent roll press and the bending amount of the electrode sheet 30 obtained as a result when the linear pressure of the main roll press was set to 800 kgf / cm 2 was examined. As a result, when the amount of bending when the extending portion was not provided was 4.5 mm, the amount of bending decreased linearly as the linear pressure was increased, and the amount of bending was 0 mm when 300 kgf / cm 2 was applied. became. At this time, the elongation amount of the uncoated part was 0.31% with respect to the width of the uncoated part. Then, the wrinkles of the uncoated part that had been observed with the naked eye until now were not seen on the electrode sheet with zero curvature. The shape of the pressurizing part of the intermittent roll press machine in this experiment is an inverted trapezoidal shape as shown in FIG. 4 (b), and the winding speed of the sheet-like metal foil S is 20 m / min or more. The tension applied to the metal foil S was about 10N to 60N. In particular, good results were obtained at about 20N to 30N. Conversely, when the tension exceeded 60 N, wrinkles occurred in the vertical direction (traveling direction of the electrode sheet).
そして、湾曲量を少なくとも２．５ｍｍ以下まで抑えた電極シートを、次工程の巻回装置に供給したところ、電極シートの破断強度及び引っ張り強度は共に伸張工程なしの場合と比較して変わりなかった。また、巻回装置における巻きずれが改善された。 Then, when the electrode sheet with the bending amount suppressed to at least 2.5 mm or less was supplied to the winding device in the next process, the breaking strength and tensile strength of the electrode sheet were not changed compared to the case without the stretching process. . Further, winding deviation in the winding device was improved.
以上の実験結果によれば、湾曲量を０にするめに必要なプレス線圧、すなわち間欠ロールプレス機により延伸部を設ける工程（ステップＳ３）におけるプレス線圧は、主ロールプレス機により圧延する工程（ステップＳ４）におけるプレス線圧の少なくとも３０％以上であることが判った。 According to the above experimental results, the press linear pressure required to reduce the bending amount to 0, that is, the press linear pressure in the step of providing the stretched portion by the intermittent roll press (step S3) is the step of rolling by the main roll press. It was found that it was at least 30% of the press line pressure in (Step S4).
間欠ロールプレス機の加圧部の間隔（ピッチ）が短すぎると電極シートの蛇行を抑えることができず、逆に、ピッチが長すぎるとシワが発生すると共に蛇行を修正することができないために湾曲する。試作機においては、ピッチが１５ｍｍ〜５０ｍｍの範囲、特に３０ｍｍ程度のときに良好な結果を得た。 If the interval (pitch) between the pressure parts of the intermittent roll press is too short, the meandering of the electrode sheet cannot be suppressed. Conversely, if the pitch is too long, wrinkles occur and the meander cannot be corrected. Bend. In the prototype, good results were obtained when the pitch was in the range of 15 mm to 50 mm, particularly about 30 mm.
このように、テンションコントロールプレスシステムによって電極シートに適度なテンションを加えながら未塗工部を加圧して延伸部を設けることで、横方向（金属箔Ｓの幅方向）への伸びを抑えながら縦方向にだけ延伸させることができる。これにより端面の変形を抑えることができたものと考えられる。 In this way, by applying an appropriate tension to the electrode sheet by the tension control press system and pressurizing the uncoated portion to provide the stretched portion, the longitudinal direction is suppressed while suppressing the stretching in the lateral direction (the width direction of the metal foil S). It can be stretched only in the direction. This is considered to have prevented the end face from being deformed.
なお、電極シートの少なくとも一の端縁部を除く全面に活物質層が圧延されるとは、ほぼ全面の活物質層が圧延されることを意味しており、ごく一部の活物質層に剥離面（活物質の無塗工面）が形成されていたり、活物質層の端面の断面が１ｍｍ程度の幅で厚みの傾斜を有する電極を用いても、本発明によって同様な効果を得られることを確認している。 In addition, that the active material layer is rolled on the entire surface excluding at least one edge of the electrode sheet means that almost the entire active material layer is rolled. The same effect can be obtained by the present invention even if a peeling surface (non-coated surface of the active material) is formed or an electrode having a width of about 1 mm and a thickness gradient is used on the end surface of the active material layer. Have confirmed.
２０ テンションコントロールプレスシステム
２１ 間欠ロールプレス機
２１Ａ 凸ロール
２１Ｂ 受けロール
２２ 主ロールプレス機
２３ 加圧部
２４ 延伸部
２５ 未加圧部
３０ 電極シート
３１ 固定具
Ｐ 活物質層
Ｕ 未塗工部
Ｘ 走行方向
DESCRIPTION OF SYMBOLS 20 Tension control press system 21 Intermittent roll press 21A Convex roll 21B Receiving roll 22 Main roll press 23 Pressurizing part 24 Extending part 25 Unpressurized part 30 Electrode sheet 31 Fixing tool P Active material layer U Uncoated part X Running direction
Claims (12)
前記延伸部は前記電極シートの長手方向に間欠的に複数設けられ、複数の前記延伸部のうち隣接する延伸部の間には未加圧部が形成され、
前記延伸部は矩形状であることを特徴とする電極シート。 An electrode sheet having a sheet-like metal thin film on at least a surface thereof, having an active material layer rolled at the center thereof, and having an uncoated portion of the active material layer at an edge thereof, An extension part is provided in at least a part of the construction part,
A plurality of the extending portions are intermittently provided in the longitudinal direction of the electrode sheet, and an unpressurized portion is formed between adjacent extending portions among the plurality of extending portions,
The extending portion has a rectangular shape.
前記延伸部は前記電極シートの長手方向に間欠的に複数設けられ、複数の前記延伸部のうち隣接する延伸部の間には未加圧部が形成され、
前記延伸部は台形状であることを特徴とする電極シート。 An electrode sheet having a sheet-like metal thin film on at least a surface thereof, having an active material layer rolled at the center thereof, and having an uncoated portion of the active material layer at an edge thereof, An extension part is provided in at least a part of the construction part,
A plurality of the extending portions are intermittently provided in the longitudinal direction of the electrode sheet, and an unpressurized portion is formed between adjacent extending portions among the plurality of extending portions,
The extending portion has a trapezoidal shape.
前記延伸部は前記電極シートの長手方向に間欠的に複数設けられ、複数の前記延伸部のうち隣接する延伸部の間には未加圧部が形成され、
前記延伸部と前記塗工部との間に延伸部が形成されない未加圧部が形成されていることを特徴とする電極シート。 An electrode sheet having a sheet-like metal thin film on at least a surface thereof, having an active material layer rolled at the center thereof, and having an uncoated portion of the active material layer at an edge thereof, An extension part is provided in at least a part of the construction part,
A plurality of the extending portions are intermittently provided in the longitudinal direction of the electrode sheet, and an unpressurized portion is formed between adjacent extending portions among the plurality of extending portions,
Electrode sheet, wherein the non-pressing the extending portion is not formed between the coated portion and the front SL extending portion.
前記矩形状の延伸部を形成する工程は、前記未塗工部を加圧する状態と加圧しない状態とが存在するように間欠的にプレスすることを特徴とする電極シートの製造方法。 A method for producing an electrode sheet, wherein an active material layer coated part is formed at the center of the electrode sheet, and the electrode sheet has an uncoated part of the active material layer at an edge of the electrode sheet. A step of forming a rectangular stretched part by pressing a part of the uncoated part, and a step of rolling the coated part,
The method for producing an electrode sheet is characterized in that the step of forming the rectangular extending portion includes intermittently pressing the uncoated portion so that there is a state where the uncoated portion is pressed and a state where the uncoated portion is not pressed.
前記台形状の延伸部を形成する工程は、前記未塗工部を加圧する状態と加圧しない状態とが存在するように間欠的にプレスすることを特徴とする電極シートの製造方法。 A method for producing an electrode sheet, wherein an active material layer coated part is formed at the center of the electrode sheet, and the electrode sheet has an uncoated part of the active material layer at an edge of the electrode sheet. A step of forming a trapezoidal stretched part by pressing a part of the uncoated part, and a step of rolling the coated part,
The step of forming the trapezoidal stretched part includes intermittently pressing the uncoated part so that there is a state where the uncoated part is pressed and a state where the uncoated part is not pressed.
前記延伸部を形成する工程は、前記未塗工部を加圧する状態と加圧しない状態とが存在するように間欠的にプレスされると共に、前記延伸部と前記塗工部との間に延伸部が形成されない未加圧部が形成されることを特徴とする電極シートの製造方法。 A method for producing an electrode sheet, wherein an active material layer coated part is formed at the center of the electrode sheet, and the electrode sheet has an uncoated part of the active material layer at an edge of the electrode sheet. A step of forming a stretched part by pressing a part of the uncoated part, and a step of rolling the coated part,
The step of forming the stretched portion is intermittently pressed so that there is a state where the uncoated portion is pressed and a state where the uncoated portion is not pressed, and the stretched portion is stretched between the stretched portion and the coated portion. A method for producing an electrode sheet, characterized in that an unpressurized part in which no part is formed is formed.
The method for producing an electrode sheet according to claim 11, further comprising a step of winding the electrode sheet between the step of forming and rolling the coated portion and the step of forming the stretched portion.
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