JP2009173385A - Winding method of strip material and winding device of strip material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To quicken winding speed in winding a strip material displaced in the width direction against the longitudinal direction and to reduce winding slippage in the cross direction of the strip material even when the winding speed changes. <P>SOLUTION: A control part 400 detects first slipping quantity that the strip materials 11 to 14 to be wound up on a winding shaft 101 are slipped in the width direction on this electrode winding device 100. Additionally, the control part 400 computes second slipping quantity that the strip materials 11 to 14 are slipped in the width direction per previously specified unit time in correspondence with the winding speed at which the strip materials 11 to 14 are wound up on the winding shaft 101. Thereafter, the control part 400 corrects the slippage in the width direction of the strip materials 11 to 14 by controlling correcting mechanisms 301 to 304 in accordance with the first slipping quantity and the second slipping quantity. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

本発明は帯状材の巻取方法および帯状材の巻取装置に関する。特に、帯状材の幅方向のずれを補正しつつ巻き取る巻取方法および巻取装置に関する。当該帯状材の巻取方法および巻取装置は、例えば、帯状電極と帯状セパレータを重ねて巻き取る電極巻取装置に採用することができる。   The present invention relates to a winding method for a strip-shaped material and a winding device for the strip-shaped material. In particular, the present invention relates to a winding method and a winding device that take up while correcting a deviation in the width direction of a belt-like material. The strip-shaped material winding method and winding device can be employed, for example, in an electrode winding device that winds a strip-shaped electrode and a strip-shaped separator.

帯状電極と帯状セパレータとを重ねて捲回した捲回電極体を製造する場合には、帯状電極と帯状セパレータができるだけずれないように捲回したい。すなわち、帯状電極には電極材料が塗工された塗工部を有している。塗工部が絶縁体である帯状セパレータからはみ出ていると内部短絡を生じさせる可能性がある。このため、帯状電極と帯状セパレータとを重ねて捲回した捲回電極体を製造する場合には、帯状電極は帯状セパレータからはみ出ないように重ねられている。かかる帯状電極と帯状セパレータを重ねて巻き取る電極巻取装置は、例えば、特開２００７−１６１４７４号公報と特開平１１−４０１４４号公報に記載されている。   In the case of manufacturing a wound electrode body in which a strip electrode and a strip separator are wound to overlap each other, it is desired to wind the strip electrode and the strip separator so as not to be displaced as much as possible. In other words, the belt-like electrode has a coating portion coated with an electrode material. If the coating part protrudes from the strip separator which is an insulator, an internal short circuit may occur. For this reason, when manufacturing the wound electrode body which wound the strip | belt-shaped electrode and the strip | belt-shaped separator, the strip | belt-shaped electrode is piled up so that it may not protrude from a strip | belt-shaped separator. Such an electrode winding device for winding a strip electrode and a strip separator in an overlapping manner is described in, for example, Japanese Patent Application Laid-Open No. 2007-161474 and Japanese Patent Application Laid-Open No. 11-40144.

特開２００７−１６１４７４号公報では、正、負電極材料（帯状電極）が帯状セパレータを介して（挟んで）捲回する捲回装置が開示されている。同公報では、帯状電極の蛇行を補正する装置において、帯状電極のエッジを検知する構成が開示されている。また、特開平１１−４０１４４号公報では、帯状電極を巻き取る装置に関し、エッジ位置検知手段で検知された帯状電極のエッジ位置に基づいてエッジ位置を補正する構成が開示されている。
特開２００７−１６１４７４号公報（図２） 特開平１１−４０１４４号公報（図１〜図３） Japanese Patent Application Laid-Open No. 2007-161474 discloses a winding device in which positive and negative electrode materials (band electrodes) are wound via a band separator. This publication discloses a configuration for detecting an edge of a strip electrode in an apparatus for correcting meandering of the strip electrode. Japanese Patent Application Laid-Open No. 11-40144 discloses a device for correcting the edge position based on the edge position of the belt-like electrode detected by the edge position detecting means with respect to an apparatus for winding the belt-like electrode.
Japanese Patent Laying-Open No. 2007-161474 (FIG. 2) Japanese Patent Laid-Open No. 11-40144 (FIGS. 1 to 3)

上述した特許文献１、２では、帯状電極等（帯状電極と帯状セパレータ）のエッジを検知し、エッジの位置を補正しながら帯状電極等を巻き取っている。すなわち、帯状電極や帯状セパレータは、巻き取られる際に蛇行する場合があり、巻き取られる帯状電極のエッジを一定の位置で検知し、当該検知された位置に基づいて、帯状電極等の幅方向のずれを補正する補正機構を制御して、帯状電極等の幅方向のずれを補正しつつ巻き取っている。捲回電極体の生産効率を向上させるためには、帯状電極等を巻き取る巻取速度を速くする必要がある。しかしながら、かかる制御において、帯状電極等を巻き取る巻取速度が速く、かつ、巻取速度が急激に変化するような場合には、帯状電極等の幅方向のずれを補正しきれずに、帯状電極等が幅方向にずれる場合があった。   In Patent Documents 1 and 2 described above, an edge of a strip electrode or the like (a strip electrode and a strip separator) is detected, and the strip electrode or the like is wound while correcting the position of the edge. That is, the strip electrode or strip separator may meander when being wound, the edge of the strip electrode to be wound is detected at a certain position, and the width direction of the strip electrode or the like is determined based on the detected position. By controlling a correction mechanism for correcting the deviation, the winding is performed while correcting the deviation in the width direction of the strip electrode or the like. In order to improve the production efficiency of the wound electrode body, it is necessary to increase the winding speed for winding the strip-shaped electrode or the like. However, in such control, when the winding speed for winding the belt-like electrode or the like is high and the winding speed changes abruptly, the belt-like electrode cannot be corrected completely without correcting the deviation in the width direction of the belt-like electrode or the like. Etc. may shift in the width direction.

本発明に係る帯状材の巻取方法は、帯状材の幅方向のずれを補正しつつ、帯状材を巻取軸に巻き取る帯状材の巻取方法であって、巻取軸に巻き取られる帯状材が幅方向にずれている第１ずれ量を検知する第１工程と、巻取軸に帯状材が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材が幅方向にずれる第２ずれ量を検知する第２工程と、第１工程で検知された第１ずれ量と前記第２工程で検知された第２ずれ量に基づいて、帯状材の幅方向のずれを補正する第３工程とを備えている。   A winding method for a strip-shaped material according to the present invention is a winding method for a strip-shaped material that winds the strip-shaped material around a winding shaft while correcting a deviation in the width direction of the strip-shaped material, and is wound around the winding shaft. The width of the band-like material per predetermined unit time is determined according to the first step of detecting the first shift amount in which the band-like material is displaced in the width direction and the winding speed at which the band-like material is wound around the winding shaft. The second step of detecting the second shift amount shifted in the direction, the first shift amount detected in the first step, and the shift in the width direction of the belt-shaped material based on the second shift amount detected in the second step. And a third step of correcting.

当該帯状材の巻取方法によれば、巻取軸に巻き取られる帯状材が幅方向にずれている第１ずれ量と、巻取軸に帯状材が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材が幅方向にずれる第２ずれ量とに基づいて、帯状材の幅方向のずれを補正する。このため、巻取速度の変化に応じて帯状材の幅方向のずれを補正して帯状材を巻き取ることができ、帯状材を巻き取る巻取速度が速く、かつ、巻取速度が変化するような場合においても、帯状材の幅方向の巻きずれを少なくすることができる。   According to the winding method of the strip-shaped material, according to the first shift amount in which the strip-shaped material wound around the winding shaft is shifted in the width direction and the winding speed at which the strip-shaped material is wound around the winding shaft, The deviation in the width direction of the belt-like material is corrected based on the second deviation amount in which the belt-like material is displaced in the width direction per predetermined unit time. For this reason, the strip | belt-shaped material can be correct | amended according to the change of winding speed, and a strip | belt-shaped material can be wound up, the winding speed which winds up a strip | belt-shaped material is high, and a winding speed changes. Even in such a case, the winding deviation in the width direction of the belt-like material can be reduced.

本発明に係る帯状材の巻取装置は、帯状材を巻き取る巻取軸と、巻取軸に巻き取られる帯状材の幅方向のずれを補正する補正機構と、補正機構を制御する制御部とを備えている。制御部は、巻取軸に巻き取られる帯状材が幅方向にずれている第１ずれ量を検知する。また、制御部は、巻取軸に帯状材が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材が幅方向にずれる第２ずれ量を算出し、第１ずれ量と第２ずれ量とに基づいて、補正機構を制御して帯状材の幅方向のずれを補正する。   The strip-shaped material winding device according to the present invention includes a winding shaft that winds the strip-shaped material, a correction mechanism that corrects a deviation in the width direction of the strip-shaped material wound around the winding shaft, and a control unit that controls the correction mechanism. And. The control unit detects a first shift amount in which the belt-shaped material wound around the winding shaft is shifted in the width direction. In addition, the control unit calculates a second shift amount in which the strip material is shifted in the width direction per predetermined unit time according to the winding speed at which the strip material is wound around the winding shaft, and the first shift amount is calculated. And the second deviation amount, the correction mechanism is controlled to correct the deviation in the width direction of the belt-like material.

当該帯状材の巻取装置は、上記構成によって、巻取速度の変化に応じて帯状材の幅方向のずれを補正して帯状材を巻き取ることができ、帯状材を巻き取る巻取速度が速く、かつ、巻取速度が変化するような場合においても、帯状材の幅方向の巻きずれを少なくすることができる。   With the above-described configuration, the belt-shaped material winding device can take up the belt-shaped material by correcting the deviation in the width direction of the belt-shaped material according to the change in the winding speed, and the winding speed for winding the belt-shaped material is high. Even when the winding speed is high and the winding speed is changed, the winding deviation in the width direction of the belt-like material can be reduced.

制御部は、例えば、帯状材の長さに対する幅方向の変位量を記憶する変位量記憶部と、帯状材を巻き取る巻取速度を検知する巻取速度検知部とを備えていてもよい。この場合、制御部は、巻取速度検知部で検知された巻取速度と変位量記憶部に記憶された帯状材の長さに対する幅方向の変位量とに基づいて第２ずれ量を算出することができる。   The control unit may include, for example, a displacement amount storage unit that stores a displacement amount in the width direction with respect to the length of the belt-shaped material, and a winding speed detection unit that detects a winding speed for winding the belt-shaped material. In this case, the control unit calculates the second deviation amount based on the winding speed detected by the winding speed detection unit and the displacement amount in the width direction with respect to the length of the belt-shaped material stored in the displacement amount storage unit. be able to.

以下、本発明の一実施形態に係る帯状材の巻取装置を図面に基づいて説明する。なお、同じ機能を奏する部材、部位には、同じ符号を付している。   Hereinafter, a belt-like material winding device according to an embodiment of the present invention will be described with reference to the drawings. In addition, the same code | symbol is attached | subjected to the member and site | part which show | play the same function.

本発明に係る帯状材の巻取装置は、帯状材を巻取軸に巻き取る巻取装置であって、例えば、リチウムイオン二次電池などの捲回電極体を製造する電極巻取装置に採用することができる。リチウムイオン二次電池などの捲回電極体１０は、例えば、図１に示すように、帯状正極１１と、第１帯状セパレータ１２と、帯状負極１３と、第２帯状セパレータ１４とが、順に重ねられて巻き取られている。なお、以下の説明において、適宜、帯状電極１１、１３、帯状セパレータ１２、１４を総称して「帯状材」という。   The strip-shaped material winding device according to the present invention is a winding device that winds the strip-shaped material around a winding shaft, and is employed in, for example, an electrode winding device that manufactures a wound electrode body such as a lithium ion secondary battery. can do. As shown in FIG. 1, for example, a wound electrode body 10 such as a lithium ion secondary battery includes a strip-shaped positive electrode 11, a first strip-shaped separator 12, a strip-shaped negative electrode 13, and a second strip-shaped separator 14 stacked in order. It has been wound up. In the following description, the strip electrodes 11 and 13 and the strip separators 12 and 14 are collectively referred to as “strip members” as appropriate.

正負の帯状電極１１、１３は、図１に示すように、それぞれ帯状シート３１、４１に電極材料３２、４２が塗工された帯状の電極体である。また、この実施形態では、捲回電極体１０はリチウム二次電池の製造に用いられる。   As shown in FIG. 1, the positive and negative strip electrodes 11 and 13 are strip-shaped electrode bodies in which electrode materials 32 and 42 are coated on strip sheets 31 and 41, respectively. In this embodiment, the wound electrode body 10 is used for manufacturing a lithium secondary battery.

帯状正極１１は、アルミニウム箔からなる帯状シート３１（正極集電体）に、リチウムを含む電極材料３２（正極活物質）が塗工されている。当該電極材料３２としては、例えば、マンガン酸リチウム（ＬｉＭｎＯ_４）、コバルト酸リチウム（ＬｉＣｏＯ_２）、ニッケル酸リチウム（ＬｉＮｉＯ_２）などが挙げられる。 In the strip-like positive electrode 11, an electrode material 32 (a positive electrode active material) containing lithium is coated on a strip-like sheet 31 (a positive electrode current collector) made of an aluminum foil. Examples of the electrode material 32 include lithium manganate (LiMnO ₄ ), lithium cobaltate (LiCoO ₂ ), lithium nickelate (LiNiO ₂ ), and the like.

帯状負極１３は、この実施形態では、銅箔からなる帯状シート４１（負極集電体）に電極材料４２（負極活物質）が塗工されている。当該電極材料４２に含まれる好適な負極活物質として、グラファイト（Graphite）やアモルファスカーボン（Amorphous Carbon）などの炭素系材料、リチウム含有遷移金属酸化物や遷移金属窒化物等などが挙げられる。   In this embodiment, the strip-shaped negative electrode 13 is formed by coating a strip-shaped sheet 41 (negative electrode current collector) made of copper foil with an electrode material 42 (negative electrode active material). Suitable negative electrode active materials contained in the electrode material 42 include carbon-based materials such as graphite and amorphous carbon, lithium-containing transition metal oxides, transition metal nitrides, and the like.

また、帯状セパレータ１２、１４は、イオン性物質が透過可能な膜であり、この実施形態では、イオン透過性のポリプロピレン製の微多孔膜を用いている。   The strip separators 12 and 14 are membranes that are permeable to ionic substances. In this embodiment, ion-permeable polypropylene microporous membranes are used.

この実施形態では、電極材料３２、４２は、帯状シート３１、４１の両面に、幅方向片側に偏って塗工されている。また、帯状シート３１、４１の幅方向反対側の縁部は、電極材料３２、４２が塗工されていない。帯状シート３１、４１は、図２に示すように、電極材料３２、４２が塗工された後で圧延されている。正負の帯状電極１１、１３のうち、帯状シート３１、４１に電極材料３２、４２が塗工された部位を塗工部１１ａ、１３ａといい、帯状シート３１、４１に電極材料３２、４２が塗工されていない部位を未塗工部１１ｂ、１３ｂという。   In this embodiment, the electrode materials 32 and 42 are applied to both surfaces of the belt-like sheets 31 and 41 so as to be biased to one side in the width direction. Moreover, the electrode materials 32 and 42 are not applied to the edge of the belt-like sheets 31 and 41 on the opposite side in the width direction. As shown in FIG. 2, the belt-like sheets 31 and 41 are rolled after the electrode materials 32 and 42 are applied. Of the positive and negative strip electrodes 11 and 13, the portions where the strip materials 31 and 41 are coated with the electrode materials 32 and 42 are referred to as coating portions 11 a and 13 a, and the strip sheets 31 and 41 are coated with the electrode materials 32 and 42. Parts that are not processed are referred to as uncoated portions 11b and 13b.

図３は、帯状正極１１と、第１帯状セパレータ１２と、帯状負極１３と、第２帯状セパレータ１４とが順に重ねられた状態を示す幅方向の断面図である。捲回電極体１０は、図１および図３に示すように、帯状正極１１の塗工部１１ａと帯状負極１３の塗工部１３ａは、それぞれ帯状セパレータ１２、１４を挟んで対向している。かかる捲回電極体１０では、内部短絡を防止するため、帯状正極１１の塗工部１１ａと帯状負極１３の塗工部１３ａは、それぞれ帯状セパレータ１２、１４からはみ出ないようにしたい。また、この実施形態にかかるリチウム二次電池では、放充電時に、帯状正極１１の塗工部１１ａと帯状負極１３の塗工部１３ａの間で、帯状セパレータ１２、１４を通してリチウムイオンが行き来する。この際、リチウムイオンの析出による内部短絡を防止するため、帯状正極１１の塗工部１１ａは、帯状負極１３の塗工部１３ａからはみ出ないようにしたい。   FIG. 3 is a cross-sectional view in the width direction showing a state in which the strip-shaped positive electrode 11, the first strip-shaped separator 12, the strip-shaped negative electrode 13, and the second strip-shaped separator 14 are sequentially stacked. In the wound electrode body 10, as shown in FIGS. 1 and 3, the coating part 11a of the strip-like positive electrode 11 and the coating part 13a of the strip-like negative electrode 13 are opposed to each other with the strip-like separators 12 and 14 interposed therebetween. In such a wound electrode body 10, in order to prevent an internal short circuit, it is desired that the coating portion 11a of the strip-shaped positive electrode 11 and the coating portion 13a of the strip-shaped negative electrode 13 do not protrude from the strip-shaped separators 12 and 14, respectively. Moreover, in the lithium secondary battery according to this embodiment, lithium ions come and go through the strip separators 12 and 14 between the coating portion 11a of the strip-like positive electrode 11 and the coating portion 13a of the strip-like negative electrode 13 during discharging. At this time, in order to prevent an internal short circuit due to precipitation of lithium ions, it is desired that the coated portion 11 a of the strip-shaped positive electrode 11 does not protrude from the coated portion 13 a of the strip-shaped negative electrode 13.

帯状正極１１の塗工部１１ａと帯状負極１３の塗工部１３ａの幅についての製造上の誤差があったり、帯状正極１１と帯状負極１３、および、帯状セパレータ１２、１４が重ねられる際の幅方向のずれが生じたりする。このため、帯状負極１３の塗工部１３ａの幅ｂと帯状正極１１の塗工部１１ａの幅ａとの差分（ｂ−ａ）、第１帯状セパレータ１２と第２帯状セパレータ１４の幅ｃ１、ｃ２と帯状負極１３の塗工部１３ａの幅ｂとの差分（（ｃ１、ｃ２）−ｂ）を設定して、上述した誤差やずれを許容している。   There is a manufacturing error in the width of the coating portion 11a of the strip-shaped positive electrode 11 and the coating portion 13a of the strip-shaped negative electrode 13, or the width when the strip-shaped positive electrode 11, the strip-shaped negative electrode 13, and the strip-shaped separators 12 and 14 are overlapped. Directional deviation may occur. Therefore, the difference (b−a) between the width b of the coating portion 13a of the strip-shaped negative electrode 13 and the width a of the coating portion 11a of the strip-shaped positive electrode 11, the width c1 of the first strip-shaped separator 12 and the second strip-shaped separator 14, A difference ((c1, c2) −b) between c2 and the width b of the coating portion 13a of the strip-shaped negative electrode 13 is set to allow the above-described error and deviation.

また、捲回電極体１０の捲回方向に直交する方向の両端（巻き軸方向の両端）には、図１に示すように、帯状正極１１と帯状負極１３の未塗工部１１ｂ、１３ｂが帯状セパレータ１２、１４からはみ出ている。当該帯状正極１１と帯状負極１３の未塗工部１１ｂ、１３ｂは、捲回電極体１０の正極と負極の集電体１１ｂ１、１３ｂ１をそれぞれ形成している。   Moreover, as shown in FIG. 1, uncoated portions 11b and 13b of the strip-like positive electrode 11 and the strip-like negative electrode 13 are formed at both ends (both ends in the winding axis direction) in the direction orthogonal to the winding direction of the wound electrode body 10. It protrudes from the strip separators 12 and 14. The uncoated portions 11b and 13b of the strip-shaped positive electrode 11 and the strip-shaped negative electrode 13 form the positive and negative current collectors 11b1 and 13b1 of the wound electrode body 10, respectively.

電極巻取装置１００は、図４に示すように、巻取軸１０１に帯状正極１１（第１帯状電極）と、第１帯状セパレータ１２と、帯状負極１３（第２帯状電極）と、第２帯状セパレータ１４とを順に重ねて巻き取る装置である。帯状電極１１、１３と帯状セパレータ１２、１４は、それぞれを巻き取ったロール２１〜２４から供給されている。この電極巻取装置１００は、巻取軸１０１と、エッジ検知装置２０１〜２０４と、補正機構３０１〜３０４と、制御部４００とを備えている。   As shown in FIG. 4, the electrode winding device 100 includes a belt-like positive electrode 11 (first belt-like electrode), a first belt-like separator 12, a belt-like negative electrode 13 (second belt-like electrode), and a second winding shaft 101. It is an apparatus which winds up the belt-like separator 14 in order. The strip electrodes 11 and 13 and the strip separators 12 and 14 are supplied from rolls 21 to 24 wound up respectively. The electrode winding device 100 includes a winding shaft 101, edge detection devices 201 to 204, correction mechanisms 301 to 304, and a control unit 400.

図４は概略的に描かれているが、巻取軸１０１は、正負一対の帯状電極１１、１３と一対の帯状セパレータ１２、１４の一端を保持する保持部１０１ａを備えている。巻取軸１０１は、駆動モータ１２０から駆動力を受けて回転する。駆動モータ１２０は、制御部４００によって制御されており、制御部４００の制御信号に基づいて駆動する。   4 schematically illustrates, the winding shaft 101 includes a pair of positive and negative strip electrodes 11 and 13 and a holding portion 101 a that holds one end of the pair of strip separators 12 and 14. The winding shaft 101 receives a driving force from the driving motor 120 and rotates. The drive motor 120 is controlled by the control unit 400 and is driven based on a control signal from the control unit 400.

エッジ検知装置２０１〜２０４は、帯状電極１１、１３と帯状セパレータ１２、１４のエッジ（幅方向の縁）の位置を検知する装置である。エッジ検知装置２０１〜２０４は、巻取軸１０１に巻き取られる直前において、帯状電極１１、１３と帯状セパレータ１２、１４のエッジの位置を検知している。エッジ検知装置２０１〜２０４はそれぞれ制御部４００に接続されており、検知信号は制御部４００に送られる。   The edge detection devices 201 to 204 are devices that detect the positions of the edges (edges in the width direction) of the strip electrodes 11 and 13 and the strip separators 12 and 14. The edge detection devices 201 to 204 detect the positions of the edges of the strip electrodes 11 and 13 and the strip separators 12 and 14 immediately before being wound around the winding shaft 101. The edge detection devices 201 to 204 are each connected to the control unit 400, and a detection signal is sent to the control unit 400.

補正機構３０１〜３０４は、帯状電極１１、１３と帯状セパレータ１２、１４の幅方向のずれを補正する機構である。この実施形態では、補正機構３０１〜３０４は、帯状電極１１、１３と帯状セパレータ１２、１４が巻取軸１０１に巻き取られる経路において、エッジ検知装置２０１〜２０４よりも上流側に配設されている。各補正機構３０１〜３０４は、それぞれ制御部４００に接続されており、制御部４００の制御信号に基づいて駆動する。   The correction mechanisms 301 to 304 are mechanisms for correcting a shift in the width direction between the strip electrodes 11 and 13 and the strip separators 12 and 14. In this embodiment, the correction mechanisms 301 to 304 are arranged on the upstream side of the edge detection devices 201 to 204 in the path where the strip electrodes 11 and 13 and the strip separators 12 and 14 are wound around the winding shaft 101. Yes. Each of the correction mechanisms 301 to 304 is connected to the control unit 400 and is driven based on a control signal from the control unit 400.

制御部４００は、ＣＰＵなどからなる演算部と、不揮発性メモリーなどからなる記憶部とを備えており、予め設定されたプログラムに沿って、当該電極巻取装置１００の種々の電子的な演算処理や各部位の制御を行う。制御部４００は、エッジ検知装置２０１〜２０４で検知された帯状電極１１、１３と帯状セパレータ１２、１４のエッジの位置に基づいて、補正機構３０１〜３０４で補正する補正量を算出する。そして、制御部４００は、当該補正量に基づいて補正機構３０１〜３０４を制御して帯状電極１１、１３と帯状セパレータ１２、１４のずれを補正する。帯状電極１１、１３と帯状セパレータ１２、１４は巻き取られる際に幅方向に蛇行する場合があるが、当該補正によって帯状電極１１、１３と帯状セパレータ１２、１４が巻き取られる際の蛇行を抑え、帯状電極１１、１３と帯状セパレータ１２、１４の巻きずれを低減させることができる。   The control unit 400 includes a calculation unit including a CPU and a storage unit including a non-volatile memory, and performs various electronic calculation processes of the electrode winding device 100 according to a preset program. And control each part. The control unit 400 calculates a correction amount to be corrected by the correction mechanisms 301 to 304 based on the positions of the edges of the strip electrodes 11 and 13 and the strip separators 12 and 14 detected by the edge detection devices 201 to 204. Then, the control unit 400 controls the correction mechanisms 301 to 304 based on the correction amount to correct the deviation between the strip electrodes 11 and 13 and the strip separators 12 and 14. Although the strip electrodes 11 and 13 and the strip separators 12 and 14 may meander in the width direction when being wound, the correction suppresses the meandering when the strip electrodes 11 and 13 and the strip separators 12 and 14 are wound. The winding deviation between the strip electrodes 11 and 13 and the strip separators 12 and 14 can be reduced.

特に、巻取速度が一定の場合や、巻取速度が遅い場合には、帯状電極１１、１３の幅方向のずれを上手く修正することができる。   In particular, when the winding speed is constant or when the winding speed is low, the deviation in the width direction of the strip electrodes 11 and 13 can be corrected well.

ところで、電池の種類にもよるが、このような捲回電極体１０を製造する際には、帯状電極１１、１３と帯状セパレータ１２、１４が概ね２ｍ〜５ｍ程度巻き取られる。この際、巻取速度は、例えば、図５に示すように、巻取りの初めに加速し、中間で巻取り速度が一定になり、巻取りの終わりで巻取速度が減速される。捲回電極体１０の生産性を向上させるためには、巻取速度を速くするとよい。この捲回電極体１０では、帯状電極１１、１３と帯状セパレータ１２、１４は概ね２ｍ〜５ｍ程度巻き取られるだけなので、例えば、１０００ｍｍ/ｓを超える巻取り速度で巻き取る場合、全体の巻取り時間はほんの数秒になる。この場合、巻取る工程の中間で巻取り速度が一定になる時間は短くなり、巻取りの初めと巻取りの終わりでは、巻取速度が急激に変化する。   By the way, although depending on the kind of battery, when manufacturing such a wound electrode body 10, the strip electrodes 11 and 13 and the strip separators 12 and 14 are wound up by about 2 to 5 m. At this time, as shown in FIG. 5, for example, the winding speed is accelerated at the beginning of winding, the winding speed becomes constant in the middle, and the winding speed is reduced at the end of winding. In order to improve the productivity of the wound electrode body 10, the winding speed may be increased. In this wound electrode body 10, since the strip electrodes 11, 13 and the strip separators 12, 14 are only wound up by about 2m to 5m, for example, when winding at a winding speed exceeding 1000mm / s, the entire winding is taken up. The time is only a few seconds. In this case, the time during which the winding speed is constant in the middle of the winding process is short, and the winding speed changes abruptly at the beginning and end of winding.

上述した制御手法では、制御部４００および補正機構３０１〜３０４によって、幅方向のずれが補正されつつ巻き取られるので、巻取速度が一定の場合や、巻取速度が遅い場合には、帯状材１１〜１４の幅方向のずれを上手く修正することができる。しかしながら、巻取速度が速く、かつ、巻取速度が急激に変化する場合には、上述した制御手法では、帯状材１１〜１４の幅方向のずれを上手く修正することが出来ない場合があった。   In the above-described control method, winding is performed while correcting the shift in the width direction by the control unit 400 and the correction mechanisms 301 to 304. Therefore, when the winding speed is constant or when the winding speed is low, the belt-like material is used. The shift in the width direction of 11 to 14 can be corrected well. However, when the winding speed is fast and the winding speed changes abruptly, the above-described control method may not be able to correct the deviation in the width direction of the strips 11 to 14 in some cases. .

本発明者は、巻取速度が速く、かつ、巻取速度が急激に変化する場合に帯状材１１〜１４の幅方向のずれが生じる原因を検討した。当該検討において、本発明者は、帯状材１１〜１４が長さ方向に対して幅方向に僅かながら変位していることに着目した。   The inventor examined the cause of the occurrence of the deviation in the width direction of the strips 11 to 14 when the winding speed is high and the winding speed changes abruptly. In the examination, the inventor paid attention to the fact that the strips 11 to 14 are slightly displaced in the width direction with respect to the length direction.

すなわち、上述したように帯状電極１１、１３は、電極材料３２、４２が塗工された後で圧延されている。圧延される帯状電極１１、１３は、帯状シート３１、４１の幅方向片側に偏って電極材料３２、４２が塗工された塗工部１１ａ、１３ａを有している。また、帯状シート３１、４１の幅方向反対側の縁部は、電極材料３２、４２が塗工されていない未塗工部１１ｂ、１３ｂを有している。このため、帯状電極１１、１３が圧延される際、図２に示すように、塗工部１１ａ、１３ａは圧延ローラ８１、８２が当たり易く延ばされるが、未塗工部１１ｂ、１３ｂは塗工部１１ａ、１３ａに比べて薄いので、圧延ローラ８１、８２で延ばされにくい。帯状電極１１、１３は、未塗工部１１ｂ、１３ｂが配設された幅方向の片側の縁部に比べて、塗工部１１ａ、１３ａが配設された部分が延ばされて長くなる。   That is, as described above, the strip electrodes 11 and 13 are rolled after the electrode materials 32 and 42 are applied. The strip-shaped electrodes 11 and 13 to be rolled have coating portions 11a and 13a to which the electrode materials 32 and 42 are coated so as to be biased to one side in the width direction of the strip-shaped sheets 31 and 41. Moreover, the edge part of the width direction opposite side of the strip | belt-shaped sheets 31 and 41 has the uncoated parts 11b and 13b in which the electrode materials 32 and 42 are not coated. Therefore, when the strip electrodes 11 and 13 are rolled, as shown in FIG. 2, the coated portions 11a and 13a are easily extended by the rolling rollers 81 and 82, but the uncoated portions 11b and 13b are coated. Since it is thinner than the portions 11a and 13a, it is difficult to extend by the rolling rollers 81 and 82. The strip electrodes 11 and 13 are elongated by extending the portions where the coated portions 11a and 13a are disposed, compared to the edge portion on one side in the width direction where the uncoated portions 11b and 13b are disposed.

このため、帯状電極１１、１３は、図６に示すように、長さ方向に対して幅方向に僅かながら変位している。この実施形態では、帯状電極１１、１３は長さ方向に対して、幅方向片側（未塗工部１１ｂ、１３ｂの側）に向けて変位しており、平坦にすると図６に示すように、未塗工部１１ｂ、１３ｂ側に湾曲した形状になる。また、図示は省略するが、未塗工部１１ｂ、１３ｂ側の縁に比べて塗工部１１ａ、１３ａ側の縁が長いので、未塗工部１１ｂ、１３ｂを真っ直ぐに伸ばすと塗工部１１ａ、１３ａの側の縁が撓む。   For this reason, as shown in FIG. 6, the strip electrodes 11 and 13 are slightly displaced in the width direction with respect to the length direction. In this embodiment, the strip electrodes 11 and 13 are displaced toward one side in the width direction (the uncoated portions 11b and 13b side) with respect to the length direction, and when flattened, as shown in FIG. It becomes a shape curved toward the uncoated portions 11b and 13b. Moreover, although illustration is abbreviate | omitted, since the edge by the side of the coating parts 11a and 13a is long compared with the edge by the side of the uncoated parts 11b and 13b, when the uncoated parts 11b and 13b are extended straight, the coating part 11a , 13a side edge bends.

当該帯状電極１１、１３の長さ方向に対する幅方向の変位はごく僅かであるが、図６では、帯状電極１１、１３の長さ方向に対する幅方向の変位を強調して描いている。変位の程度は、圧延される程度や、帯状シート３１、４１に塗工される電極材料３２、４２の厚さなどによって異なる。例えば、帯状電極１１、１３の長さ２〜５ｍに対して幅方向の変位は３ｍｍ程度である。本発明者は、かかる帯状電極１１、１３の長さ方向に対する幅方向の極僅かな変位が、巻取速度が速く、かつ、巻取速度が急激に変化するような場合に巻きずれを生じさせる原因になると考えた。   Although the displacement in the width direction with respect to the length direction of the strip electrodes 11 and 13 is very small, in FIG. 6, the displacement in the width direction with respect to the length direction of the strip electrodes 11 and 13 is drawn with emphasis. The degree of displacement varies depending on the degree of rolling, the thickness of the electrode materials 32 and 42 applied to the belt-like sheets 31 and 41, and the like. For example, the displacement in the width direction is about 3 mm with respect to the lengths 2 to 5 m of the strip electrodes 11 and 13. The present inventor has found that the slight displacement in the width direction with respect to the length direction of the strip electrodes 11 and 13 causes a winding slip when the winding speed is high and the winding speed changes abruptly. I thought it would be a cause.

さらに、本発明者は帯状セパレータ１２、１４についても巻きずれが生じる原因を検討した。帯状セパレータ１２、１４も、厳密には、幅方向の両側において縁部の長さが異なり、長さ方向に対して幅方向に変位していることがわかった。帯状セパレータ１２、１４は、その製造工程において、シートを薄く引き伸ばしたり、適当な幅に切断したりしている。特に、シートを薄く引き伸ばす工程においては、引き伸ばす方向等が均一でなく、引き伸ばす工程の後で撓みが残る。かかる撓みが、帯状セパレータ１２、１４が、長さ方向に対して幅方向に変位する原因になると考えられる。帯状セパレータ１２、１４の場合、長さ方向に対して幅方向に変位する程度は、長さ２ｍ〜５ｍに対して、幅方向の変位は概ね３〜５ｍｍ程度である。変位の程度は、帯状セパレータ１２、１４の材質や引き延ばされる程度などによって異なる。   Further, the present inventor has examined the cause of the winding deviation of the strip separators 12 and 14. Strictly speaking, it has been found that the strip separators 12 and 14 have different edge lengths on both sides in the width direction and are displaced in the width direction with respect to the length direction. In the manufacturing process, the strip separators 12 and 14 are thinly stretched or cut to an appropriate width. In particular, in the process of stretching the sheet thinly, the stretching direction or the like is not uniform, and bending remains after the stretching process. Such bending is considered to cause the strip separators 12 and 14 to be displaced in the width direction with respect to the length direction. In the case of the strip separators 12 and 14, the displacement in the width direction with respect to the length direction is approximately 3 to 5 mm with respect to the length of 2 to 5 m. The degree of displacement varies depending on the material of the strip separators 12 and 14 and the extent to which they are extended.

すなわち、これらの帯状材１１〜１４は、帯状材１１〜１４を巻取速度が一定のときや、巻取速度が遅い場合には、上述したようにエッジ検知装置２０１〜２０４で検知されたずれ量に基づいて、補正機構３０１〜３０４の補正量を算出する手法で巻きずれを防止できる。しかしながら、帯状材１１〜１４を巻き取る巻取速度が速く、かつ、巻取速度が急激に変化するような場合には、巻取速度の変化に応じて帯状材１１〜１４が幅方向にずれる量が変化する。このため、エッジ検知装置２０１〜２０４で検知されたずれ量に基づいて、補正機構３０１〜３０４の補正量を算出する手法では、巻取速度の変化に対応しきれずに巻きずれを防止できない。   That is, when the winding speed of the strips 11 to 14 is constant or when the winding speed is slow, the deviation detected by the edge detectors 201 to 204 is as described above. Winding deviation can be prevented by a method of calculating the correction amount of the correction mechanisms 301 to 304 based on the amount. However, when the winding speed for winding the strips 11 to 14 is high and the winding speed changes abruptly, the strips 11 to 14 shift in the width direction according to the change in the winding speed. The amount changes. For this reason, the method of calculating the correction amounts of the correction mechanisms 301 to 304 based on the shift amounts detected by the edge detection devices 201 to 204 cannot prevent the winding shift without being able to cope with the change in the winding speed.

本発明者は、上述した捲回電極体１０の製造工程において、帯状電極１１、１３や帯状セパレータ１２、１４を巻き取る巻取速度が速く、かつ、巻取速度が急激に変化するような場合に、帯状電極１１、１３や帯状セパレータ１２、１４に巻きずれが生じる原因をこのように考えた。そして、帯状電極１１、１３や帯状セパレータ１２、１４の巻きずれを効果的に防止できる巻取方法、および、電極巻取装置を考えた。以下に、この電極巻取装置１００を説明する。   In the manufacturing process of the wound electrode body 10 described above, the inventor has a high winding speed for winding the strip electrodes 11 and 13 and the strip separators 12 and 14 and the winding speed changes abruptly. In addition, the cause of the occurrence of winding deviation in the strip electrodes 11 and 13 and the strip separators 12 and 14 was considered in this way. And the winding method and electrode winding apparatus which can prevent effectively the winding | displacement of the strip | belt-shaped electrodes 11 and 13 and the strip | belt-shaped separators 12 and 14 were considered. Below, this electrode winding apparatus 100 is demonstrated.

この電極巻取装置１００では、図４と図７に示すように、制御部４００は、第１ずれ量検知部４０１と、第２ずれ量算出部４０２と、補正制御部４０３とを備えている。図７は、この制御部４００において、補正機構３０１〜３０４を制御する制御フローを示している。   In the electrode winding apparatus 100, as shown in FIGS. 4 and 7, the control unit 400 includes a first deviation amount detection unit 401, a second deviation amount calculation unit 402, and a correction control unit 403. . FIG. 7 shows a control flow for controlling the correction mechanisms 301 to 304 in the control unit 400.

第１ずれ量検知部４０１は、巻取軸１０１に巻き取られる帯状材１１〜１４（帯状電極１１、１３と帯状セパレータ１２、１４）が幅方向にずれている第１ずれ量を検知する。当該第１ずれ量は、検知時における巻取軸１０１に巻き取られる帯状材１１〜１４の幅方向のずれ量に相当する。すなわち、エッジ検知装置２０１〜２０４で検知された帯状材１１〜１４の位置に対して、予め基準となる基準位置を設定しておく。そして、エッジ検知装置２０１〜２０４で検知された帯状材１１〜１４のエッジの位置に基づいて、当該検知されたエッジの位置が当該基準位置からずれたずれ量を検知する。すなわち、当該第１ずれ量は、（帯状材１１〜１４の現在の位置）−（予め設定された基準位置）で検知するとよい。当該第１ずれ量は、主として帯状材１１〜１４の蛇行によるずれ量に相当する。   The first deviation amount detection unit 401 detects a first deviation amount in which the strips 11 to 14 (the strip electrodes 11 and 13 and the strip separators 12 and 14) wound around the winding shaft 101 are shifted in the width direction. The said 1st deviation | shift amount is corresponded to the deviation | shift amount of the width direction of the strip | belt shaped materials 11-14 wound by the winding shaft 101 at the time of a detection. That is, a reference position serving as a reference is set in advance for the positions of the strips 11 to 14 detected by the edge detection devices 201 to 204. And based on the edge position of the strip | belt-shaped materials 11-14 detected by the edge detection apparatuses 201-204, the deviation | shift amount from which the position of the said detected edge shifted | deviated from the said reference position is detected. That is, the first shift amount may be detected by (current position of the strips 11 to 14) − (preset reference position). The first shift amount mainly corresponds to a shift amount due to meandering of the strips 11 to 14.

第２ずれ量算出部４０２は、巻取軸１０１に帯状材１１〜１４が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材１１〜１４が幅方向にずれる第２ずれ量を算出する。なお、予め定められた単位時間は、例えば、補正機構３０１〜３０４を制御する制御部の制御タイミングを採用するとよい。例えば、巻取速度が１０００ｍｍ/ｓを超えるような高速捲回では、制御精度を向上させるため、かかる単位時間は５マイクロ秒（ｍsec）以下にするとよい。   The second deviation amount calculation unit 402 is a second unit in which the strips 11 to 14 are shifted in the width direction per predetermined unit time according to the winding speed at which the strips 11 to 14 are wound around the winding shaft 101. The amount of deviation is calculated. The predetermined unit time may be, for example, the control timing of the control unit that controls the correction mechanisms 301 to 304. For example, in high-speed winding in which the winding speed exceeds 1000 mm / s, the unit time is preferably 5 microseconds (msec) or less in order to improve control accuracy.

第２ずれ量は、帯状材１１〜１４の長さ方向に対する幅方向の変位（帯状材１１〜１４の湾曲）に起因して、巻き取る際に生じる幅方向のずれ量に相当する。第２ずれ量は、例えば、（帯状材１１〜１４の長さ方向に対する幅方向の変位量）×（巻取速度）×（予め定められた単位時間（制御間隔：制御タイミング））で算出することができる。   The second displacement amount corresponds to the displacement amount in the width direction that occurs when winding due to the displacement in the width direction with respect to the length direction of the strip materials 11 to 14 (curvature of the strip materials 11 to 14). The second shift amount is calculated by, for example, (displacement amount in the width direction with respect to the length direction of the strips 11 to 14) × (winding speed) × (predetermined unit time (control interval: control timing)). be able to.

この実施形態では、制御部４００は、変位量記憶部４０４と、巻取速度検知部４０５とを備えている。   In this embodiment, the control unit 400 includes a displacement amount storage unit 404 and a winding speed detection unit 405.

変位量記憶部４０４は、帯状材１１〜１４の長さに対する幅方向の変位量を記憶する。この実施形態では、帯状材１１〜１４は、上述したように、長さ方向に対して幅方向に変位している。例えば、帯状材１１〜１４が１ｍに対して幅方向に２ｍｍ程度変位している場合には、変位量記憶部４０４に、帯状材１１〜１４が長さ１ｍに対して幅方向に２ｍｍ変位していることを記憶させるとよい。   The displacement storage unit 404 stores the displacement in the width direction with respect to the length of the strips 11 to 14. In this embodiment, the strips 11 to 14 are displaced in the width direction with respect to the length direction as described above. For example, when the strips 11 to 14 are displaced by about 2 mm in the width direction with respect to 1 m, the strips 11 to 14 are displaced by 2 mm in the width direction with respect to the length 1 m in the displacement amount storage unit 404. It is good to remember that

巻取速度検知部４０５は、帯状材１１〜１４を巻き取る巻取速度を検知する。巻取速度は、図示は省略するが、例えば、帯状材１１〜１４の速度を測定するエンコーダのパルスから算出した速度を用いることができる。なお、帯状材１１〜１４の巻取速度は、これに限定されず、巻取軸１０１の駆動モータ１２０への指令値や実測した駆動モータ１２０の回転速度、および、巻き径に基づいて算出してもよい。   The winding speed detection unit 405 detects the winding speed at which the strips 11 to 14 are wound. Although illustration is abbreviate | omitted for winding speed, the speed calculated from the pulse of the encoder which measures the speed of the strip | belt materials 11-14 can be used, for example. The winding speed of the strips 11 to 14 is not limited to this, and is calculated based on the command value to the drive motor 120 of the winding shaft 101, the measured rotational speed of the drive motor 120, and the winding diameter. May be.

この場合、制御部４００は、巻取速度検知部４０５で検知された巻取速度と、変位量記憶部４０４に記憶された帯状材１１〜１４の長さに対する幅方向の変位量とに基づいて第２ずれ量を算出することができる。すなわち、この場合、例えば、第２ずれ量は、変位量記憶部４０４に記憶された変位量（帯状材１１〜１４の長さ方向に対する幅方向の変位量）×巻取速度検知部４０５で検知された巻取速度（巻取速度）×（予め定められた単位時間（制御間隔））で算出するとよい。   In this case, the control unit 400 is based on the winding speed detected by the winding speed detection unit 405 and the displacement amount in the width direction with respect to the length of the strips 11 to 14 stored in the displacement amount storage unit 404. The second deviation amount can be calculated. That is, in this case, for example, the second deviation amount is detected by the displacement amount stored in the displacement amount storage unit 404 (the displacement amount in the width direction with respect to the length direction of the strips 11 to 14) × the winding speed detection unit 405. The winding speed (winding speed) x (predetermined unit time (control interval)) may be calculated.

補正制御部４０３は、当該第１ずれ量と第２ずれ量とに基づいて、補正機構３０１〜３０４を制御して帯状材１１〜１４の幅方向のずれを補正する。この実施形態では、補正制御部４０３は、図７に示すように、第１ずれ量検知部４０１で検知された第１ずれ量と第２ずれ量算出部４０２で算出された第２ずれ量とに第１ずれ量と第２ずれ量にそれぞれ適当なゲインｇ１、ｇ２を掛けて足し合わせて、帯状材１１〜１４の幅方向のずれを補正する補正量を算出するとよい。この場合、ゲインｇ１、ｇ２は、１に設定してもよいが、制御上適当なゲインを求めて採用するとよい。   The correction control unit 403 controls the correction mechanisms 301 to 304 based on the first deviation amount and the second deviation amount to correct the deviation in the width direction of the strips 11 to 14. In this embodiment, as shown in FIG. 7, the correction control unit 403 includes the first deviation amount detected by the first deviation amount detection unit 401 and the second deviation amount calculated by the second deviation amount calculation unit 402. The correction amount for correcting the shift in the width direction of the strips 11 to 14 may be calculated by multiplying the first shift amount and the second shift amount by appropriate gains g1 and g2, respectively, and adding them. In this case, the gains g1 and g2 may be set to 1, but a gain appropriate for control may be obtained and employed.

このように、当該制御部４００は、補正機構３０１〜３０４を制御して、帯状材１１〜１４の幅方向のずれを補正する。制御部４００は、所定の制御間隔で、帯状材１１〜１４のエッジの検知を繰り返しながら、上述した補正量の算出を行って補正機構３０１〜３０４の制御を行っている。   As described above, the control unit 400 controls the correction mechanisms 301 to 304 to correct the deviation in the width direction of the strips 11 to 14. The control unit 400 controls the correction mechanisms 301 to 304 by calculating the correction amount described above while repeating detection of the edges of the strips 11 to 14 at a predetermined control interval.

制御間隔は、巻取速度に応じて適切な制御間隔を設定するとよい。例えば、１０００ｍｍ/ｓよりも速い巻取速度で、帯状材１１〜１４を巻き取るような場合には、５マイクロ秒よりも短い制御間隔で、帯状材１１〜１４のエッジの検知を繰り返しながら、上述した補正量の算出を行って補正機構３０１〜３０４の制御を行うとよい。これにより、巻取り速度に応じて適切に巻きずれを防止することができる。   The control interval may be set to an appropriate control interval according to the winding speed. For example, when winding the strips 11 to 14 at a winding speed faster than 1000 mm / s, while repeatedly detecting the edges of the strips 11 to 14 at a control interval shorter than 5 microseconds, It is preferable to control the correction mechanisms 301 to 304 by calculating the correction amount described above. Thereby, winding deviation can be appropriately prevented according to the winding speed.

上述したように、この電極巻取装置１００では、制御部４００において、巻取軸１０１に巻き取られる帯状材１１〜１４が幅方向にずれている第１ずれ量を検知する第１工程と、巻取軸１０１に帯状材１１〜１４が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材１１〜１４が幅方向にずれる第２ずれ量を検知する第２工程と、第１工程で検知された第１ずれ量と第２工程で検知された第２ずれ量に基づいて、帯状材１１〜１４の幅方向のずれを補正する第３工程とが具現化されている。   As described above, in the electrode winding apparatus 100, the control unit 400 detects the first shift amount in which the strips 11 to 14 wound around the winding shaft 101 are shifted in the width direction; A second step of detecting a second shift amount in which the strips 11 to 14 are shifted in the width direction per predetermined unit time according to the winding speed at which the strips 11 to 14 are wound around the winding shaft 101; The third step of correcting the deviation in the width direction of the strips 11 to 14 based on the first deviation amount detected in the first step and the second deviation amount detected in the second step is embodied. Yes.

第１工程で検知された第１ずれ量には、帯状材１１〜１４の蛇行によるずれが反映されている。また、第２工程で検知された第２ずれ量には、帯状材１１〜１４が巻き取られる速度の変化にも対応して、帯状材１１〜１４の長さ方向に対する幅方向の変位によるずれが反映されている。そして、第３工程では、第１工程で検知された第１ずれ量と第２工程で検知された第２ずれ量に基づいて、帯状材１１〜１４の幅方向のずれが補正される。   The first shift amount detected in the first step reflects a shift due to meandering of the strips 11 to 14. In addition, the second shift amount detected in the second step corresponds to the change in the speed at which the strips 11 to 14 are wound, and is shifted due to the displacement in the width direction with respect to the length direction of the strips 11 to 14. Is reflected. In the third step, the deviation in the width direction of the strips 11 to 14 is corrected based on the first deviation detected in the first process and the second deviation detected in the second process.

かかる補正において、上述した変位量記憶部４０４に記憶された帯状材１１〜１４の長さに対する幅方向の変位量や巻取速度検知部４０５で検知された巻取速度が厳密に正確でなくても、ある程度正確であれば当該補正により、巻きずれを補正することができる。すなわち、変位量記憶部４０４に記憶された帯状材１１〜１４の長さに対する幅方向の変位量や巻取速度検知部４０５で検知された巻取速度が厳密に正確でない場合には、第２ずれ量算出部４０２で算出される第２ずれ量は、帯状材１１〜１４の長さに対する幅方向の変位量や巻取速度に起因する実際のずれ量に対して差が生じる。しかしながら、帯状材１１〜１４の長さに対する幅方向の変位量や巻取速度（巻取速度）がある程度正確であれば、その誤差に起因するずれ量はそれほど大きくなく、かかる誤差によって生じるずれ量は、上述した蛇行による第１ずれ量を検知する際に反映される。このため、当該誤差によるずれも算出される補正量に反映される。   In such correction, the displacement amount in the width direction relative to the length of the strips 11 to 14 stored in the displacement amount storage unit 404 and the winding speed detected by the winding speed detection unit 405 are not strictly accurate. However, if it is accurate to some extent, the correction can correct the winding deviation. That is, when the displacement amount in the width direction with respect to the length of the strips 11 to 14 stored in the displacement amount storage unit 404 and the winding speed detected by the winding speed detection unit 405 are not strictly accurate, the second The second displacement amount calculated by the displacement amount calculation unit 402 differs from the actual displacement amount due to the displacement amount in the width direction with respect to the length of the strips 11 to 14 and the winding speed. However, if the amount of displacement in the width direction relative to the length of the strips 11 to 14 and the winding speed (winding speed) are accurate to some extent, the amount of deviation caused by the error is not so large, and the amount of deviation caused by such an error. Is reflected when the first shift amount due to meandering described above is detected. For this reason, the deviation due to the error is also reflected in the calculated correction amount.

このように制御部４００に記憶された帯状材１１〜１４の長さに対する幅方向の変位量や制御部４００で検知された巻取速度が厳密に正確でない場合でも、長さ方向に対して幅方向に変位する帯状材１１〜１４を巻き取る装置において巻きずれを小さくすることができる。   Thus, even when the displacement amount in the width direction relative to the length of the strips 11 to 14 stored in the control unit 400 and the winding speed detected by the control unit 400 are not strictly accurate, the width in the length direction is Winding deviation can be reduced in an apparatus that winds the strips 11 to 14 that are displaced in the direction.

以上説明したように、この電極巻取装置１００では、制御部４００は、巻取軸１０１に巻き取られる帯状材１１〜１４が幅方向にずれている第１ずれ量を検知する。また、制御部４００は、巻取軸１０１に帯状材１１〜１４が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材１１〜１４が幅方向にずれる第２ずれ量を算出する。そして、制御部４００は、第１ずれ量と第２ずれ量とに基づいて、補正機構３０１〜３０４を制御して帯状材１１〜１４の幅方向のずれを補正する。当該電極巻取装置１００によれば、巻取速度の変化に応じて帯状材１１〜１４の幅方向のずれを補正して帯状材を巻き取ることができ、帯状材１１〜１４を巻き取る巻取速度が速く、かつ、巻取速度が変化するような場合においても、帯状材１１〜１４の幅方向の巻きずれを少なくすることができる。   As described above, in the electrode winding apparatus 100, the control unit 400 detects the first shift amount in which the strips 11 to 14 wound around the winding shaft 101 are shifted in the width direction. Moreover, the control part 400 is the 2nd deviation | shift amount from which the strip | belt materials 11-14 shift | deviate in the width direction per predetermined unit time according to the winding speed by which the strip | belt materials 11-14 are wound around the winding shaft 101. Is calculated. And the control part 400 controls the correction | amendment mechanisms 301-304 based on the 1st deviation | shift amount and the 2nd deviation | shift amount, and correct | amends the deviation | shift of the strip | belt-shaped materials 11-14 in the width direction. According to the electrode winding device 100, the belt-like material can be wound by correcting the deviation in the width direction of the belt-like material 11-14 according to the change in the winding speed, and the belt-like material 11-14 is wound up. Even when the take-up speed is high and the take-up speed changes, the winding deviation in the width direction of the strips 11 to 14 can be reduced.

この電極巻取装置１００は、上述したように帯状正極１１と、第１帯状セパレータ１２と、帯状負極１３と、第２帯状セパレータ１４とを順に重ねて巻き取って捲回電極体１０を製造する。この電極巻取装置１００は、かかる用途において、帯状電極１１、１３と帯状セパレータ１２、１４の巻きずれを小さくすることができる。これにより、図１に示すように、差分（ｂ−ａ）や差分（（ｃ１、ｃ２）−ｂ）を小さくすることができるので、それだけ製造コスト（特に、帯状電極１１、１３や帯状セパレータ１２、１４の材料コスト）を低減させることができる。   As described above, the electrode winding apparatus 100 manufactures the wound electrode body 10 by winding the belt-like positive electrode 11, the first belt-like separator 12, the belt-like negative electrode 13, and the second belt-like separator 14 in order. . The electrode winding device 100 can reduce the winding deviation between the strip electrodes 11 and 13 and the strip separators 12 and 14 in such applications. Thereby, as shown in FIG. 1, since the difference (b−a) and the difference ((c1, c2) −b) can be reduced, the manufacturing cost (particularly, the strip electrodes 11 and 13 and the strip separator 12) can be reduced accordingly. , 14 material costs) can be reduced.

以上、本発明の一実施形態に係る帯状材の巻取方法および帯状材の巻取装置（電極巻取装置）を説明したが、本発明は上述した実施形態に限定されない。   The strip-shaped material winding method and the strip-shaped material winding device (electrode winding device) according to one embodiment of the present invention have been described above, but the present invention is not limited to the above-described embodiment.

例えば、帯状材の巻取装置は、上述した実施形態のように、第１帯状電極と、第１帯状セパレータと、第２帯状電極と、第２帯状セパレータとを順に重ねて巻き取る電極巻取装置に限定されない。本発明は、種々の帯状材の巻取装置に適用できる。特に、上述した帯状電極や帯状セパレータのように、帯状材が長さ方向に対して幅方向に変位している場合に好適である。すなわち、帯状材の巻取装置は、電極巻取装置に限定されず、また、帯状材についても、捲回電極体を構成する帯状電極や帯状セパレータに限定されず、種々の帯状材を巻き取る装置に適用できる。この場合、捲回電極体の製造工程のように、複数の帯状材を重ねて巻き取る用途に限定されず、一本の帯状材を巻取軸に巻き取るような用途に適用できる。また、巻取軸は、上述した実施形態のように、帯状材とは別の軸部材を巻取軸としてもよいが、帯状材の端部を軸状に丸めて巻取軸にしてもよい。また、本発明に係る帯状材の巻取方法および帯状材の巻取装置は、ここに例示する変形例に限らず、種々の変更が可能である。   For example, as in the above-described embodiment, the belt-shaped material winding device is configured to take up the first belt-shaped electrode, the first belt-shaped separator, the second belt-shaped electrode, and the second belt-shaped separator in order and wind up. It is not limited to a device. The present invention can be applied to various belt-like material winding devices. In particular, it is suitable when the belt-like material is displaced in the width direction with respect to the length direction like the above-described belt-like electrode and belt-like separator. In other words, the belt-like material winding device is not limited to the electrode winding device, and the belt-like material is not limited to the belt-like electrode and the belt-like separator constituting the wound electrode body, and takes up various belt-like materials. Applicable to equipment. In this case, the present invention is not limited to the use of winding a plurality of belt-like materials in a stacked manner as in the manufacturing process of a wound electrode body, and can be applied to the use of winding a single belt-like material around a winding shaft. Further, as in the above-described embodiment, the winding shaft may be a shaft member that is different from the belt-shaped material, but the end portion of the belt-shaped material may be rounded into a shaft to form the winding shaft. . Moreover, the strip | belt-shaped material winding method and strip | belt-shaped material winding apparatus which concern on this invention are not restricted to the modification illustrated here, A various change is possible.

本発明の一実施形態における捲回電極体の構造を示す図。The figure which shows the structure of the winding electrode body in one Embodiment of this invention. 本発明の一実施形態における帯状電極の製造工程を示す斜視図。The perspective view which shows the manufacturing process of the strip electrode in one Embodiment of this invention. 本発明の一実施形態における捲回電極体の電極構造を示す断面図。Sectional drawing which shows the electrode structure of the wound electrode body in one Embodiment of this invention. 本発明の一実施形態に係る電極巻取装置を示す図。The figure which shows the electrode winding apparatus which concerns on one Embodiment of this invention. 本発明の一実施形態における帯状材の巻取速度を示す図。The figure which shows the winding speed of the strip | belt-shaped material in one Embodiment of this invention. 本発明の一実施形態における帯状電極が長さ方向に対する幅方向の変位を示す平面図。The top view which shows the displacement of the width direction with respect to the length direction in the strip | belt-shaped electrode in one Embodiment of this invention. 本発明の一実施形態に係る電極巻取装置の制御部において、補正機構を制御する制御フロー図。The control flowchart which controls a correction | amendment mechanism in the control part of the electrode winding apparatus which concerns on one Embodiment of this invention.

符号の説明Explanation of symbols

１０ 捲回電極体
１１ 帯状正極(帯状電極、帯状材)
１１ａ 塗工部
１１ｂ 未塗工部
１１ｂ１ 集電体
１２、１４ 帯状セパレータ(帯状材)
１３ 帯状負極(帯状電極、帯状材)
１３ａ 塗工部
１３ｂ 未塗工部
１３ｂ１ 集電体
２１-２４ ロール
３１ 帯状シート（正極集電体、アルミニウム箔）
３２ 電極材料（正極活物質）
４１ 帯状シート（負極集電体、銅箔）
４２ 電極材料（負極活物質）
８１、８２ 圧延ローラ
１００ 電極巻取装置
１０１ 巻取軸
１０１ａ 保持部
１２０ 駆動モータ
２０１-２０４ エッジ検知装置
３０１-３０４ 補正機構
４００ 制御部
４０１ 第１ずれ量検知部
４０２ 第２ずれ量算出部
４０３ 補正制御部
４０４ 変位量記憶部
４０５ 巻取速度検知部 10 wound electrode body 11 strip positive electrode (strip electrode, strip material)
11a Coated part 11b Uncoated part 11b1 Current collectors 12, 14 Strip separator (band material)
13 Strip negative electrode (strip electrode, strip material)
13a Coating part 13b Uncoated part 13b1 Current collector 21-24 Roll 31 Strip sheet (positive electrode current collector, aluminum foil)
32 Electrode material (positive electrode active material)
41 Strip sheet (negative electrode current collector, copper foil)
42 Electrode material (negative electrode active material)
81, 82 Rolling roller 100 Electrode winding device 101 Winding shaft 101a Holding unit 120 Drive motor 201-204 Edge detection device 301-304 Correction mechanism 400 Control unit 401 First deviation amount detection unit 402 Second deviation amount calculation unit 403 Correction Control unit 404 Displacement amount storage unit 405 Winding speed detection unit

Claims (3)

帯状材の幅方向のずれを補正しつつ、帯状材を巻取軸に巻き取る帯状材の巻取方法であって、
前記巻取軸に巻き取られる帯状材が幅方向にずれている第１ずれ量を検知する第１工程と、
前記巻取軸に帯状材が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材が幅方向にずれる第２ずれ量を検知する第２工程と、
前記第１工程で検知された第１ずれ量と前記第２工程で検知された第２ずれ量に基づいて、前記帯状材の幅方向のずれを補正する第３工程とを備えた、帯状材の巻取方法。 A method of winding the belt-shaped material that winds the belt-shaped material around the winding shaft while correcting the shift in the width direction of the belt-shaped material,
A first step of detecting a first shift amount in which the belt-like material wound around the winding shaft is shifted in the width direction;
A second step of detecting a second shift amount in which the belt-like material is shifted in the width direction per predetermined unit time in accordance with a winding speed at which the belt-like material is wound on the winding shaft;
A strip-shaped material comprising: a third step of correcting a displacement in the width direction of the strip-shaped material based on the first shift amount detected in the first step and the second shift amount detected in the second step. Winding method. 帯状材を巻き取る巻取軸と、
前記巻取軸に巻き取られる帯状材の幅方向のずれを補正する補正機構と、
前記補正機構を制御する制御部と
を備えた巻取装置であって、
前記制御部は、
前記巻取軸に巻き取られる帯状材が幅方向にずれている第１ずれ量を検知する第１ずれ量検知部と、
前記巻取軸に帯状材が巻き取られる巻取速度に応じて、予め定められた単位時間当たりに帯状材が幅方向にずれる第２ずれ量を算出する第２ずれ量算出部と、
前記第１ずれ量と第２ずれ量とに基づいて、前記補正機構を制御して帯状材の幅方向のずれを補正する補正制御部とを備えた、帯状材の巻取装置。 A winding shaft for winding the belt-like material;
A correction mechanism for correcting a deviation in the width direction of the belt-shaped material wound on the winding shaft;
A winding device including a control unit for controlling the correction mechanism,
The controller is
A first deviation amount detection unit that detects a first deviation amount in which the belt-like material wound around the winding shaft is displaced in the width direction;
A second deviation amount calculating unit that calculates a second deviation amount in which the band-shaped material is shifted in the width direction per predetermined unit time according to a winding speed at which the band-shaped material is wound around the winding shaft;
A strip-shaped material winding device comprising: a correction control unit that controls the correction mechanism to correct a shift in the width direction of the strip-shaped material based on the first shift amount and the second shift amount. 前記制御部は、
前記帯状材の長さに対する幅方向の変位量を記憶する変位量記憶部と、
前記帯状材を巻き取る巻取速度を検知する巻取速度検知部と
を備え、
前記巻取速度検知部で検知された巻取速度と、前記変位量記憶部に記憶された前記帯状材の長さに対する幅方向の変位量とに基づいて、前記第２ずれ量を算出する、請求項２に記載の帯状材の巻取装置。 The controller is
A displacement amount storage unit for storing a displacement amount in the width direction with respect to the length of the strip-shaped material;
A winding speed detector for detecting a winding speed for winding the belt-like material;
Calculating the second deviation amount based on the winding speed detected by the winding speed detection unit and the displacement amount in the width direction with respect to the length of the strip-shaped material stored in the displacement amount storage unit; The winding apparatus of the strip | belt-shaped material of Claim 2.

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