JP2005044539A - Manufacturing method of secondary battery electrode and roll press device - Google Patents

Manufacturing method of secondary battery electrode and roll press device Download PDF

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JP2005044539A
JP2005044539A JP2003200405A JP2003200405A JP2005044539A JP 2005044539 A JP2005044539 A JP 2005044539A JP 2003200405 A JP2003200405 A JP 2003200405A JP 2003200405 A JP2003200405 A JP 2003200405A JP 2005044539 A JP2005044539 A JP 2005044539A
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electrode
base material
roll
active material
press
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Japanese (ja)
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Daisuke Tsukamoto
大輔 塚本
Hidehiko Tajima
英彦 田島
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries 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
    • 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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Abstract

<P>PROBLEM TO BE SOLVED: To avoid the occurrence of breakage in an electrode and to form holes in a substrat steadily. <P>SOLUTION: In this manufacturing method of an electrode for a secondary battery, active materials 13 are coated on both main surfaces of a belt-shape substrate 12 leaving both ends along the longitudinal direction of the substrate 12 uncoated, and then, the active materials 13 are pressed so as to have fixed thicknesses by a pair of press rolls 15a, 15b from both main surface side of the substrate 12 and an electrode 14 is formed on the substrate 12. A process of forming holes 19 beforehand along the longitudinal direction of the substrate 12 on the substrate 12 corresponding to the boundary of the coated part and the uncoated part of the active material 13 is provided. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
この発明は、リチウム二次電池に使用される二次電池用電極の製造方法及びロールプレス装置に関する。
【０００２】
【従来の技術】
周知の如く、カメラ一体型ＶＴＲ、ノート型パソコン、携帯電話等の電子機器には、リチウム二次電池が使用されている。ところで、こうした二次電池には電極が組み込まれるが、活物質と基材の密着性向上および電極の薄膜化のため、電極をプレスすることが電池性能に対して重要である。
【０００３】
図３は、従来における電極の製造方法の一例を示す（特許文献１）。
図中の符番１は、基材としての集電体１ａと、この集電体１ａに塗布されかつ乾燥処理が施されている活物質１ｂとからなる電極前駆体（厚みｔ１）を示す。
ここで、集電体１ａは、例えばアルミニウム箔である。前記電極前駆体１は、矢印Ｘ方向に回転するロール２ａ，２ｂ間に通して、厚みｔ２の電極３を矢印Ｙ方向に連続的に成形する。
【０００４】
【特許文献１】
特開平１１−１８５７３６号公報（段落［００１６］，［００２３］及び図２参照）
【０００５】
【発明が解決しようとする課題】
ところで、従来の電極の製造方法において、ロール２ａ，２ｂを通過した電極３は図４に示すような平面形状になっている。図４において、符番４は活物質１ｂの塗布部であり、符番５は未塗布部である。この後、図４の点線Ｚのように、電極３の塗布部４と未塗布部５を切り取って電極片とし、これを複数枚積層して二次電池の電極として使用する。
【０００６】
しかし、活物質１ｂを塗布した電極前駆体１をロール２ａ，２ｂでプレスする際、活物質の塗布部４と未塗布部５の境界部で電極３の長手方向に沿って伸び差が生じる。従って、図４の一点鎖線部分６の電極３に破れが生じるという問題があった。
【０００７】
本発明はこうした事情を考慮してなされたもので、活物質の塗布部と未塗布部の境に対応する基材に、該基材の長手方向に沿って予め穴を開けることにより、活物質を塗布した基材をプレスする際に徐々にたまっていく歪を開放し、もって電極に破れが生じるのを回避しえる二次電池用電極の製造方法を提供することを目的とする。
【０００８】
また、本発明は、長手方向に沿う両端部を残して両主面に活物質が塗布された基材を巻き取る第１の電極ロールと、前記基材を該基材の両主面から押圧する一対のプレスロールと、このプレスロールの上流側に配置され，活物質の塗布部と未塗布部の境に対応する前記基材に穴を開ける穴あけ機構と、前記穴あけ機構及びプレスロール間を通過した電極を巻き取る第２の電極ロールとを具備した構成にすることにより、基材に穴を確実に開けることができるロールプレス装置を提供することを目的とする。
【０００９】
【課題を解決するための手段】
本願第１の発明に係る二次電池用電極の製造方法は、帯状の基材の両主面に、該基材の長手方向に沿う両端部を残して活物質を塗布した後、前記基材の両主面側から一対のプレスロールで活物質が一定厚みになるようにプレスして電極を形成する方法において、活物質の塗布部と未塗布部の境に対応する前記基材に、該基材の長手方向に沿って予め穴を開ける工程を有することを特徴とする二次電池用電極の製造方法である。
【００１０】
本願第２の発明に係るロールプレス装置は、帯状の基材から二次電池用電極を形成する際に使用されるロールプレス装置において、長手方向に沿う両端部を残して両主面に活物質が塗布された基材を巻き取る第１の電極ロールと、前記基材を該基材の両主面から押圧する一対のプレスロールと、このプレスロールの上流側に配置され，活物質の塗布部と未塗布部の境に対応する前記基材に穴を開ける穴あけ機構と、前記穴あけ機構及びプレスロール間を通過した電極を巻き取る第２の電極ロールとを具備することを特徴とする。
【００１１】
本発明において、前記穴は、基材の長手方向に沿って一定間隔で開けられていることが好ましい。また、穴は基材の長手方向に沿う両端部側に並んで形成することが好ましい。この理由は、穴加工を容易にし、また、穴の影響による電極ロールの蛇行を防止するためである。但し、穴のピッチは特に限定されず、基材をプレスする際の活物質の塗布部と未塗布部における伸び差を考慮して適宜設定する。
【００１２】
本発明において、前記基材の両面に活物質を塗布し、プレスロールによりプレスして帯状の電極を形成した後、活物質の塗布部と未塗布部の部分を切り抜いて電極片を形成することが好ましい。本発明の場合、活物質の塗布部と未塗布部に対応する基材部分に破れがなく、かつ均一の厚さの電極が形成されるので、正常な電極片を得ることができ、信頼性の高い二次電極を組み立てることができる。
なお、電極片はプラス極用とマイナス極用とがあり、夫々別々に形成する。
本発明において、前記基材とは、例えば銅箔またはアルミニウム箔が挙げられる。
【００１３】
【発明の実施の形態】
以下、本発明の一実施例に係る二次電池用電極の製造方法について図１（Ａ）〜（Ｃ）及び図２（Ａ），（Ｂ）を参照して説明する。ここで、図１は本発明に係る電極を製造するためのロールプレス装置の説明図であり、図１（Ａ）は全体図、図１（Ｂ）は図１（Ａ）の正面図、図１（Ｃ）は図１（Ａ），（Ｂ）の装置の一構成であるプレスロールの説明図を示す。また、図２（Ａ）は本発明に係る電極を形成するための基材の平面図、図２（Ｂ）は同電極の平面図を示す。
【００１４】
まず、ロールプレス装置について説明する。
図１中の符番１１ａ，１１ｂは、夫々互に離間して配置された第１の電極ロール，第２の電極ロールを示す。ここで、一方の電極ロール１１ａには、基材１２が巻かれている。ここで、この基材１２の両主面には、該基材１２の長手方向に沿う両端部を残して活物質１３が塗布されている。前記基材１２は、例えば銅箔叉はアルミニウム箔から構成されている。他方の電極ロール１１ｂには、後述する穴あけロール及びプレスロールを通過した電極１４が巻き取られる。
【００１５】
前記第１の電極ロール１１ａ，第２の電極ロール１１ｂ間には、上下に対向して配置された一対のプレスロール１５ａ，１５ｂが配置されている。このプレスロール１５ａ，１５ｂにより前記基材１２が上下方向からプレスされる。前記プレスロール１５ａ，１５ｂの上流側（第１の電極ロール１１ａ側）には、穴あけ機構としての一対の穴あけロール１６ａ，１６ｂが上下方向に配置されている。
【００１６】
一方の穴あけロール１６ａの長手方向に沿う両端部には、図１（Ｃ）に示すように、基材１２に開けられる穴間距離のピッチで凸部１７が設けられている。また、他方の穴あけロール１６ｂには、図１（Ｃ）に示すように、前記凸部１７に対応する位置に凹部１８が形成されている。前記穴あけロール１６ａ，１６ｂにより、活物質１３の塗布部と未塗布部の境に対応する前記基材１２に穴１９が開けられる。
【００１７】
前記プレスロール１５ａ，１５ｂを通過する前の基材１２は、図２（Ａ）に示すように、前記穴あけロール１６ａ，１６ｂにより、活物質１３を塗布すべき塗布部２０と未塗布部２１の境界部に、基材１２の長手方向に沿って予め穴１９が等間隔で開けられている。なお、穴１９は、基材１２の幅方向に向かって同じ位置に並んでいる。また、前記電極１４の平面形状は、図２（Ｂ）に示すようになっている。
【００１８】
次に、電極の製造方法について説明する。
まず、基材１２の両主面に、活物質１３を基材１２の長手方向に沿う両端部を残して塗布した。つづいて、前記活物質１３を塗布した基材１２を電極ロール１１ａに巻いた後、前記基材１２を穴あけロール１６ａ，１６ｂ間に搬送し、長手方向に沿う活物質１３の塗布部２０と未塗布部２１の境界の位置に等間隔で穴１９を開けた。次に、前記活物質１３を塗布した基材１２を一対のプレスロール１５ａ，１５ｂ間に送り、ここでプレス処理して均一な膜厚の電極１４を電極ロール１１ｂに巻いた。
【００１９】
なお、例えば積層型の二次電池用電極を製作するには、図２（Ｂ）に一点線Ｘで示すように電極１４の塗布部（活物質１３形成箇所）及び未塗布部２１を複数切り取り、例えばプラス用電極を製作する。また、マイナス用電極の場合も同様にして製作し、プラス用電極、マイナス用電極を交互に積層することにより積層型二次電池を製作する。巻取型電池の場合は、同様に製作したプラス用電極、マイナス用電極を重ね、巻き取ることにより巻取型電池を製作する。
【００２０】
上記実施例によれば、活物質１３の塗布部２０と未塗布部２１の境界部に位置する基材１２に、該基材１２の長手方向に沿って予め穴１９を等間隔で開けた後、前記基材１２を一対のプレスロール１５ａ，１５ｂによりプレスして電極１４を形成するため、活物質１３を塗布した基材１２をプレスする際に徐々にたまっていく歪を開放することができ、もって電極１４に破れが生じるのを回避することができる。従って、従来と比べて歩留りを向上できるとともに、上記電極を利用した二次電池の組立に要する作業時間を減少することができる。
【００２１】
また、上記実施例に係るプレスロール装置は、図１に示すように、長手方向に沿う両端部を残して両主面に活物質１３が塗布された基材１２を巻き取る第１の電極ロール１１ａと、活物質１３が塗布された基材１２を該基材１２の両主面から押圧する一対のプレスロール１５ａ，１５ｂと、このプレスロール１５ａ、１５ｂの上流側に配置され，活物質１３の塗布部２０と未塗布部２１の境に対応する前記基材１２に穴１９を開ける穴あけロール１６ａ，１６ｂと、前記穴あけロール１６ａ，１６ｂ及びプレスロール１５ａ、１５ｂ間を通過した電極１４を巻き取る第２の電極ロール１１ｂとを具備した構成になっている。従って、前記プレスロール装置によれば、活物質１３を塗布した基材１２に穴１９を確実に開けることができる。
【００２２】
なお、上記実施例では、基材の長手方向に沿う穴を幅方向に並んで形成した場合について述べたが、これに限らず、穴位置が幅方向でずれて形成されていてもよい。また、上記実施例では、穴あけ機構として穴あけロールを用いた場合について述べたが、これに限定されない。
【００２３】
【発明の効果】
以上詳述したように本発明によれば、活物質の塗布部と未塗布部の境に対応する基材に、該基材の長手方向に沿って予め穴を開けることにより、活物質を塗布した基材をプレスする際に徐々にたまっていく歪を開放し、もって電極に破れが生じるのを回避しえる二次電池用電極の製造方法を提供できる。
【００２４】
また、本発明によれば、長手方向に沿う両端部を残して両主面に活物質が塗布された基材を巻き取る第１の電極ロールと、前記基材を該基材の両主面から押圧する一対のプレスロールと、このプレスロールの上流側に配置され，活物質の塗布部と未塗布部の境に対応する前記基材に穴を開ける穴あけ機構と、前記穴あけ機構及びプレスロール間を通過した電極を巻き取る第２の電極ロールとを具備した構成にすることにより、基材に穴を確実に開けることができるロールプレス装置を提供できる。
【図面の簡単な説明】
【図１】本発明に係る電極を製造するためのプレスロール装置の説明図。
【図２】本発明に係る電極を形成するための基材及び電極の平面図。
【図３】従来の電極を製造するための装置の説明図。
【図４】従来の電極の平面図。
【符号の説明】
１１ａ，１１ｂ…電極ロール、 １２…基材、 １３…活物質、
１４…電極、 １５ａ，１５ｂ…プレスロール、
１６ａ，１６ｂ…穴あけロール、 １７…凸部、 １８…凹部、
１９…穴、 ２０…塗布部、 ２１…未塗布部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing an electrode for a secondary battery used for a lithium secondary battery and a roll press apparatus.
[0002]
[Prior art]
As is well known, lithium secondary batteries are used in electronic devices such as camera-integrated VTRs, notebook computers, and mobile phones. By the way, although an electrode is incorporated in such a secondary battery, it is important for battery performance to press the electrode in order to improve the adhesion between the active material and the base material and to reduce the thickness of the electrode.
[0003]
FIG. 3 shows an example of a conventional electrode manufacturing method (Patent Document 1).
Reference numeral 1 in the figure indicates an electrode precursor (thickness t 1 ) composed of a current collector 1a as a base material and an active material 1b applied to the current collector 1a and subjected to a drying treatment. .
Here, the current collector 1a is, for example, an aluminum foil. The electrode precursor 1, roll 2a rotating in the direction of arrow X, through the inter-2b, continuously forming an electrode 3 having a thickness t 2 in the arrow Y direction.
[0004]
[Patent Document 1]
JP-A-11-185736 (see paragraphs [0016], [0023] and FIG. 2)
[0005]
[Problems to be solved by the invention]
By the way, in the conventional electrode manufacturing method, the electrode 3 that has passed through the rolls 2a and 2b has a planar shape as shown in FIG. In FIG. 4, reference numeral 4 is an application part of the active material 1b, and reference numeral 5 is an unapplied part. Thereafter, as indicated by the dotted line Z in FIG. 4, the coated portion 4 and the uncoated portion 5 of the electrode 3 are cut out to form electrode pieces, and a plurality of these are stacked and used as the electrode of the secondary battery.
[0006]
However, when the electrode precursor 1 coated with the active material 1b is pressed by the rolls 2a and 2b, a difference in elongation occurs along the longitudinal direction of the electrode 3 at the boundary between the coated portion 4 and the uncoated portion 5 of the active material. Therefore, there is a problem that the electrode 3 in the one-dot chain line portion 6 in FIG. 4 is broken.
[0007]
The present invention has been made in consideration of such circumstances, and by making a hole in advance along the longitudinal direction of the base material corresponding to the boundary between the active material application part and the non-application part, the active material It is an object of the present invention to provide a method for producing an electrode for a secondary battery that releases a strain that gradually accumulates when pressing a base material coated with, thereby preventing the electrode from being broken.
[0008]
The present invention also provides a first electrode roll for winding a base material coated with an active material on both main surfaces, leaving both ends along the longitudinal direction, and pressing the base material from both main surfaces of the base material A pair of press rolls, a drilling mechanism that is disposed upstream of the press roll and that opens a hole in the base material corresponding to the boundary between the active material application part and the non-application part, and between the punching mechanism and the press roll. An object of the present invention is to provide a roll press apparatus that can reliably make a hole in a base material by providing a second electrode roll that winds up the passed electrode.
[0009]
[Means for Solving the Problems]
In the method for manufacturing an electrode for a secondary battery according to the first invention of the present application, an active material is applied to both main surfaces of a belt-like base material, leaving both ends along the longitudinal direction of the base material, and then the base material. In the method of forming an electrode by pressing the active material so as to have a certain thickness from a pair of press rolls from both main surface sides, the base material corresponding to the boundary between the coated portion and the uncoated portion of the active material, It is a manufacturing method of the electrode for secondary batteries characterized by having the process of making a hole previously along the longitudinal direction of a substrate.
[0010]
A roll press device according to a second invention of the present application is a roll press device used when forming an electrode for a secondary battery from a strip-shaped base material, with active materials on both main surfaces leaving both end portions along the longitudinal direction. A first electrode roll that winds up the base material coated with a coating material, a pair of press rolls that press the base material from both main surfaces of the base material, and an active material coating disposed upstream of the press roll. And a second electrode roll that winds up the electrode that has passed between the punching mechanism and the press roll.
[0011]
In the present invention, the holes are preferably opened at regular intervals along the longitudinal direction of the substrate. Moreover, it is preferable to form a hole along with the both ends along the longitudinal direction of a base material. The reason for this is to facilitate drilling and prevent meandering of the electrode roll due to the influence of the holes. However, the pitch of the holes is not particularly limited, and is set as appropriate in consideration of the difference in elongation between the coated portion and the uncoated portion of the active material when the substrate is pressed.
[0012]
In this invention, after apply | coating an active material on both surfaces of the said base material and pressing with a press roll and forming a strip | belt-shaped electrode, the part of the application part of an active material and the part of an unapplication part are cut out, and an electrode piece is formed. Is preferred. In the case of the present invention, the base material portion corresponding to the active material coated portion and the uncoated portion is not torn and an electrode having a uniform thickness is formed, so that a normal electrode piece can be obtained and reliability is improved. High secondary electrode can be assembled.
The electrode pieces are for the positive electrode and the negative electrode, and are formed separately.
In the present invention, examples of the substrate include copper foil and aluminum foil.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a method for manufacturing an electrode for a secondary battery according to an embodiment of the present invention will be described with reference to FIGS. 1 (A) to 1 (C) and FIGS. 2 (A) and 2 (B). Here, FIG. 1 is explanatory drawing of the roll press apparatus for manufacturing the electrode which concerns on this invention, FIG. 1 (A) is a general view, FIG.1 (B) is a front view of FIG. 1 (C) is an explanatory view of a press roll which is one configuration of the apparatus of FIGS. 1 (A) and 1 (B). 2A is a plan view of a base material for forming an electrode according to the present invention, and FIG. 2B is a plan view of the electrode.
[0014]
First, the roll press apparatus will be described.
Reference numerals 11a and 11b in FIG. 1 indicate a first electrode roll and a second electrode roll that are spaced apart from each other. Here, the base material 12 is wound around one electrode roll 11a. Here, the active material 13 is applied to both main surfaces of the base material 12, leaving both end portions along the longitudinal direction of the base material 12. The substrate 12 is made of, for example, copper foil or aluminum foil. The electrode 14 that has passed through a punching roll and a press roll described later is wound around the other electrode roll 11b.
[0015]
Between the first electrode roll 11a and the second electrode roll 11b, a pair of press rolls 15a and 15b are arranged so as to face each other in the vertical direction. The substrate 12 is pressed from above and below by the press rolls 15a and 15b. On the upstream side of the press rolls 15a and 15b (on the first electrode roll 11a side), a pair of drilling rolls 16a and 16b as a drilling mechanism are arranged in the vertical direction.
[0016]
As shown in FIG. 1C, convex portions 17 are provided at both end portions along the longitudinal direction of one of the perforating rolls 16a at a pitch of the distance between the perforations that can be perforated in the base material 12. Further, as shown in FIG. 1C, the other punching roll 16b has a concave portion 18 at a position corresponding to the convex portion 17. Holes 19 are formed in the base material 12 corresponding to the boundary between the application part and the non-application part of the active material 13 by the punching rolls 16a and 16b.
[0017]
As shown in FIG. 2 (A), the base material 12 before passing through the press rolls 15a and 15b is formed between the coating part 20 and the uncoated part 21 to which the active material 13 is to be applied by the punching rolls 16a and 16b. In the boundary portion, holes 19 are previously formed at equal intervals along the longitudinal direction of the substrate 12. The holes 19 are arranged at the same position in the width direction of the substrate 12. The planar shape of the electrode 14 is as shown in FIG.
[0018]
Next, an electrode manufacturing method will be described.
First, the active material 13 was applied to both main surfaces of the substrate 12 leaving both end portions along the longitudinal direction of the substrate 12. Subsequently, after the base material 12 coated with the active material 13 is wound around the electrode roll 11a, the base material 12 is transported between the perforating rolls 16a and 16b, and the coated portion 20 of the active material 13 along the longitudinal direction and the uncoated portion 20 Holes 19 were made at equal intervals at the boundary of the application part 21. Next, the base material 12 coated with the active material 13 was sent between a pair of press rolls 15a and 15b, and was pressed here to wind an electrode 14 having a uniform film thickness around the electrode roll 11b.
[0019]
For example, in order to manufacture a laminated type secondary battery electrode, a plurality of coated portions (active material 13 forming portions) and uncoated portions 21 of the electrode 14 are cut out as indicated by a dotted line X in FIG. For example, a positive electrode is manufactured. Further, the negative electrode is manufactured in the same manner, and a stacked secondary battery is manufactured by alternately stacking a positive electrode and a negative electrode. In the case of a winding type battery, a winding type battery is manufactured by stacking and winding up a positive electrode and a negative electrode manufactured in the same manner.
[0020]
According to the above embodiment, after the holes 19 are previously formed at equal intervals along the longitudinal direction of the base material 12 in the base material 12 located at the boundary between the coated part 20 and the non-coated part 21 of the active material 13. Since the electrode 12 is formed by pressing the substrate 12 with a pair of press rolls 15a and 15b, the strain that gradually accumulates when the substrate 12 coated with the active material 13 is pressed can be released. Thus, the electrode 14 can be prevented from being broken. Accordingly, the yield can be improved as compared with the conventional case, and the working time required for assembling the secondary battery using the electrode can be reduced.
[0021]
In addition, as shown in FIG. 1, the press roll apparatus according to the above embodiment is a first electrode roll that winds up the base material 12 coated with the active material 13 on both main surfaces, leaving both end portions along the longitudinal direction. 11a and a pair of press rolls 15a and 15b for pressing the base material 12 coated with the active material 13 from both main surfaces of the base material 12, and an upstream side of the press rolls 15a and 15b. Winding rolls 16a and 16b for making a hole 19 in the base material 12 corresponding to the boundary between the coating part 20 and the uncoated part 21 and the electrode 14 passed between the punching rolls 16a and 16b and the press rolls 15a and 15b are wound. The second electrode roll 11b is provided. Therefore, according to the press roll apparatus, the hole 19 can be reliably opened in the base material 12 coated with the active material 13.
[0022]
In addition, in the said Example, although the case where the hole in alignment with the longitudinal direction of a base material was formed along with the width direction was described, not only this but a hole position may be shifted and formed in the width direction. Moreover, in the said Example, although the case where a drilling roll was used as a drilling mechanism was described, it is not limited to this.
[0023]
【The invention's effect】
As described above in detail, according to the present invention, the active material is applied to the base material corresponding to the boundary between the active material application part and the non-application part by pre-drilling along the longitudinal direction of the base material. Thus, it is possible to provide a method for manufacturing an electrode for a secondary battery that can release strain that gradually accumulates when pressing the base material, and can prevent the electrode from being broken.
[0024]
Moreover, according to this invention, the 1st electrode roll which winds up the base material with which the active material was apply | coated to both main surfaces, leaving the both ends along a longitudinal direction, and both the main surfaces of this base material A pair of press rolls that are pressed from each other, a punching mechanism that is disposed upstream of the press roll and that opens a hole in the base material corresponding to the boundary between the active material application part and the non-application part, and the punching mechanism and the press roll The roll press apparatus which can open a hole reliably in a base material can be provided by setting it as the structure which comprised the 2nd electrode roll which winds up the electrode which passed between.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a press roll apparatus for producing an electrode according to the present invention.
FIG. 2 is a plan view of a base material and electrodes for forming an electrode according to the present invention.
FIG. 3 is an explanatory diagram of an apparatus for producing a conventional electrode.
FIG. 4 is a plan view of a conventional electrode.
[Explanation of symbols]
11a, 11b ... electrode roll, 12 ... base material, 13 ... active material,
14 ... Electrode, 15a, 15b ... Press roll,
16a, 16b ... drilling roll, 17 ... convex, 18 ... concave,
19 ... hole, 20 ... applied part, 21 ... unapplied part.

Claims (4)

帯状の基材の両主面に、該基材の長手方向に沿う両端部を残して活物質を塗布した後、前記基材の両主面側から一対のプレスロールで活物質が一定厚みになるようにプレスして電極を形成する方法において、
活物質の塗布部と未塗布部の境に対応する前記基材に、該基材の長手方向に沿って予め穴を開ける工程を有することを特徴とする二次電池用電極の形成方法。After applying the active material to both main surfaces of the band-shaped base material leaving both ends along the longitudinal direction of the base material, the active material is made to have a constant thickness with a pair of press rolls from both main surface sides of the base material. In the method of forming an electrode by pressing as follows:
A method for forming an electrode for a secondary battery, comprising: a step of previously forming a hole in the base material corresponding to a boundary between an active material application part and an unapplied part along the longitudinal direction of the base material. 前記穴は、基材の長手方向に向って一定間隔で開けられていることを特徴とする請求項１記載の二次電池用電極の製造方法。2. The method for manufacturing an electrode for a secondary battery according to claim 1, wherein the holes are formed at regular intervals in the longitudinal direction of the substrate. 前記基材の両主面に活物質を塗布し、帯状の電極を形成した後、活物質の塗布部と未塗布部の部分を切り抜いて電極片を形成することを特徴とする請求項１若しくは請求項２記載の二次電池用電極の製造方法。The active material is applied to both main surfaces of the base material to form a strip-shaped electrode, and then an electrode piece is formed by cutting out an active material applied portion and an uncoated portion. The manufacturing method of the electrode for secondary batteries of Claim 2. 帯状の基材から二次電池用電極を形成する際に使用されるロールプレス装置において、
長手方向に沿う両端部を残して両主面に活物質が塗布された基材を巻き取る第１の電極ロールと、前記基材を該基材の両主面から押圧する一対のプレスロールと、このプレスロールの上流側に配置され，活物質の塗布部と未塗布部の境に対応する前記基材に穴を開ける穴あけ機構と、前記穴あけ機構及びプレスロール間を通過した電極を巻き取る第２の電極ロールとを具備することを特徴とするロールプレス装置。In a roll press device used when forming an electrode for a secondary battery from a strip-shaped substrate,
A first electrode roll that winds up a base material coated with an active material on both main surfaces, leaving both ends along the longitudinal direction, and a pair of press rolls that press the base material from both main surfaces of the base material; The punching mechanism is disposed upstream of the press roll and opens a hole in the base material corresponding to the boundary between the active material coated portion and the uncoated portion, and the electrode that has passed between the punching mechanism and the press roll is wound up. A roll press apparatus comprising a second electrode roll.
JP2003200405A 2003-07-23 2003-07-23 Manufacturing method of secondary battery electrode and roll press device Pending JP2005044539A (en)

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JP2006318672A (en) * 2005-05-10 2006-11-24 Sony Corp Manufacturing methods of electrode and battery, and manufacturing device of electrode
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