JP2011238474A - Electrode sheet manufacturing device - Google Patents

Electrode sheet manufacturing device Download PDF

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JP2011238474A
JP2011238474A JP2010109131A JP2010109131A JP2011238474A JP 2011238474 A JP2011238474 A JP 2011238474A JP 2010109131 A JP2010109131 A JP 2010109131A JP 2010109131 A JP2010109131 A JP 2010109131A JP 2011238474 A JP2011238474 A JP 2011238474A
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current collector
collector sheet
sheet
electrode
electrode sheet
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JP5535755B2 (en
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Masanori Hirai
政則 平井
Tetsuya Sato
哲也 佐藤
Susumu Saito
晋 斎藤
Kazuyuki Tsukawaki
和幸 塚脇
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Envision AESC Energy Devices Ltd
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NEC Energy Devices 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

PROBLEM TO BE SOLVED: To provide an electrode sheet manufacturing device capable of reducing a manufacturing cost.SOLUTION: The electrode sheet manufacturing device 1 generates a dispersion layer containing an electrode active material on the surface of a collector sheet c which is continuously conveyed. The electrode sheet manufacturing device 1 is provided with an application part 12 which applies slurry containing the electrode active material onto the surface of the collector sheet c, and a drying unit 2 which is located downstream of the application part 12 in the conveyance direction of the collector sheet c and heats the collector sheet c. The drying unit 2 is provided with movable rollers 14a, 14b which generate an S-shaped conveyance route for the collector sheet c.

Description

本発明は、リチウムイオン二次電池用電極シート製造装置に関する。   The present invention relates to an electrode sheet manufacturing apparatus for a lithium ion secondary battery.

リチウムイオン二次電池は、正極および負極の２種類の電極を備えている。これらの電極では、金属からなる集電体の表面にそれぞれに対応する電極活物質を含む分散層が形成されている。   The lithium ion secondary battery includes two types of electrodes, a positive electrode and a negative electrode. In these electrodes, a dispersion layer containing a corresponding electrode active material is formed on the surface of a current collector made of metal.

リチウムイオン二次電池の各電極は、一般的に、大面積の電極シートが形成された後に、該電極シートが切り分けられることにより製造される。これにより、効率的な電極の製造が可能である。電極シートの表面の分散層は、連続的に搬送されている集電体シートの表面に、電極活物質を含むスラリーが塗布され、該スラリーが加熱されてスラリーの溶媒成分が蒸発させられることにより形成される。すなわち、集電体シートの表面のスラリーが乾燥させられると電極シートの分散層となる。   Each electrode of a lithium ion secondary battery is generally manufactured by cutting an electrode sheet after a large-area electrode sheet is formed. Thereby, efficient manufacture of an electrode is possible. The dispersion layer on the surface of the electrode sheet is formed by applying a slurry containing an electrode active material to the surface of the current collector sheet being continuously conveyed, and heating the slurry to evaporate the solvent component of the slurry. It is formed. That is, when the slurry on the surface of the current collector sheet is dried, a dispersion layer of the electrode sheet is formed.

図１は一般的なリチウムイオン二次電池用電極シート製造装置１０１の概略構成図である。電極シート製造装置１０１では、まず供給ローラ１１１から集電体シートｃが供給されると、その後、集電体シートｃの表面に塗布部１１２によってスラリーが塗布される。塗布部１１２によって表面にスラリーが塗布された集電体シートｃは、スラリーを乾燥させる乾燥装置１０２内の複数のサポートローラ１１３を順次経由して、ニップローラ１１５まで搬送される。乾燥装置１０２のニップローラ１１５に到達した集電体シートｃの表面にはスラリーが乾燥した分散層が形成されている。すなわち、この時点で電極シートが完成している。ニップローラ１１５を通過した電極シートは回収ローラ１１６に巻き付けられて回収される。   FIG. 1 is a schematic configuration diagram of a general lithium ion secondary battery electrode sheet manufacturing apparatus 101. In the electrode sheet manufacturing apparatus 101, first, when the current collector sheet c is supplied from the supply roller 111, the slurry is applied to the surface of the current collector sheet c by the application unit 112. The current collector sheet c having the surface coated with the slurry by the coating unit 112 is conveyed to the nip roller 115 via the plurality of support rollers 113 in the drying device 102 for drying the slurry. A dispersion layer in which the slurry is dried is formed on the surface of the current collector sheet c that has reached the nip roller 115 of the drying apparatus 102. That is, the electrode sheet is completed at this point. The electrode sheet that has passed through the nip roller 115 is wound around the collection roller 116 and collected.

リチウムイオン二次電池用電極シート製造装置が特許文献１に開示されている。この電極シート製造装置は、図１に示した電極シート製造装置に類似した構成を有している。   An electrode sheet manufacturing apparatus for a lithium ion secondary battery is disclosed in Patent Document 1. This electrode sheet manufacturing apparatus has a configuration similar to the electrode sheet manufacturing apparatus shown in FIG.

特開２０１０−０４０３００号公報JP 2010-040300 A

近年、電気自動車やハイブリッド自動車の普及などにより、安価な電池が求められている。そのため、電極シートの製造コストの低減が要求されている。しかし、電極シートを製造するためには、上述したように、集電体シートの表面にスラリーを形成し、該スラリーを加熱乾燥させる必要がある。電極シートの製造コストは、電極シートの表面のスラリーを加熱乾燥させるためにかかる消費電力が大きいほど高くなる。   In recent years, inexpensive batteries have been demanded due to the spread of electric vehicles and hybrid vehicles. Therefore, reduction of the manufacturing cost of an electrode sheet is requested | required. However, in order to produce an electrode sheet, as described above, it is necessary to form a slurry on the surface of the current collector sheet and to heat and dry the slurry. The manufacturing cost of the electrode sheet increases as the power consumption for heating and drying the slurry on the surface of the electrode sheet increases.

そこで、本発明は、低消費電力でスラリーを乾燥可能なリチウムイオン二次電池用電極シート製造装置を提供することにある。   Then, this invention is providing the electrode sheet manufacturing apparatus for lithium ion secondary batteries which can dry a slurry with low power consumption.

上記目的を達成するため、本発明の電極シート製造装置は、連続的に搬送される集電体シートの表面に電極活物質を含む分散層を形成するリチウムイオン二次電池用電極シート製造装置であって、集電体シートの表面に電極活物質を含むスラリーを塗布する塗布部と、該塗布部よりも集電体シートの搬送方向の下流にあり、集電体シートを加熱する乾燥部と、を有し、前記乾燥部は、蛇行した集電体シートの搬送路を形成する蛇行機構を備えていることを特徴とする。   In order to achieve the above object, an electrode sheet manufacturing apparatus of the present invention is an electrode sheet manufacturing apparatus for a lithium ion secondary battery in which a dispersion layer containing an electrode active material is formed on the surface of a continuously conveyed current collector sheet. An application unit that applies a slurry containing an electrode active material to the surface of the current collector sheet; a drying unit that is downstream of the application unit in the transport direction of the current collector sheet and heats the current collector sheet; The drying section is provided with a meandering mechanism for forming a meandering current collector sheet conveyance path.

本発明によれば、低消費電力でスラリーを乾燥可能なリチウムイオン二次電池用電極シート製造装置を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the electrode sheet manufacturing apparatus for lithium ion secondary batteries which can dry a slurry with low power consumption can be provided.

一般的な電極シート製造装置の概略構成図である。It is a schematic block diagram of a general electrode sheet manufacturing apparatus. 本発明の一実施形態に係る電極シート製造装置の概略構成図である。It is a schematic block diagram of the electrode sheet manufacturing apparatus which concerns on one Embodiment of this invention. 図１に示した電極シート製造装置の概略構成図である。It is a schematic block diagram of the electrode sheet manufacturing apparatus shown in FIG.

次に、本発明の実施形態について図面を参照して説明する。   Next, embodiments of the present invention will be described with reference to the drawings.

図２は本発明の一実施形態に係るリチウムイオン二次電池用電極シート製造装置１の概略構成図である。   FIG. 2 is a schematic configuration diagram of an electrode sheet manufacturing apparatus 1 for a lithium ion secondary battery according to an embodiment of the present invention.

本実施形態に係る電極シート製造装置１では、供給ローラ１１から回収ローラ１６まで集電体シートｃが等速で連続的に搬送される。そのために、供給ローラ１１と回収ローラ１６とは、集電体シートｃが等速で搬送されるように、それぞれ適切な速度で回転駆動させられる。   In the electrode sheet manufacturing apparatus 1 according to the present embodiment, the current collector sheet c is continuously conveyed from the supply roller 11 to the collection roller 16 at a constant speed. For this purpose, the supply roller 11 and the collection roller 16 are each driven to rotate at an appropriate speed so that the current collector sheet c is conveyed at a constant speed.

電極シート製造装置１では、まず供給ローラ１１から集電体シートｃが供給されると、その後、集電体シートｃの表面に塗布部１２によってスラリーが塗布される。集電体シートｃには、正極と負極とのそれぞれに適した金属箔が用いられる。スラリーは、電極活物質等が溶媒に分散されたものである。正極用のスラリーには、一例として正極活物質であるリチウム金属酸化物などが溶媒に分散されたものを用いることができる。一方、負極用のスラリーには、負極活物質であるカーボン材料が溶媒に分散されたものが用いることができる。溶媒には、一般的に有機系のものが用いられる。   In the electrode sheet manufacturing apparatus 1, first, when the current collector sheet c is supplied from the supply roller 11, the slurry is applied to the surface of the current collector sheet c by the application unit 12. A metal foil suitable for each of the positive electrode and the negative electrode is used for the current collector sheet c. The slurry is obtained by dispersing an electrode active material or the like in a solvent. As an example of the slurry for the positive electrode, a slurry in which a lithium metal oxide that is a positive electrode active material is dispersed in a solvent can be used. On the other hand, a slurry in which a carbon material, which is a negative electrode active material, is dispersed in a solvent can be used as the negative electrode slurry. As the solvent, an organic solvent is generally used.

本実施形態では、正極用の集電体シートｃには厚さ２０μｍのアルミニウム箔が用いられている。正極活物質には、マンガン酸リチウムやニッケル酸リチウムやコバルト酸リチウムなどが適宜用いられ、溶媒には、Ｎ−メチル−２−ピロリドンが用いられている。正極用のスラリーには、正極活物質以外に、ＰＶＤＦ（ポリフッ化ビニリデン：ＰｏｌｙＶｉｎｙｌｉｄｅｎｅ ＤｉＦｌｕｏｒｉｄｅ）からなるバインダ、およびアセチレンブラックからなる導電体が溶媒に分散されている。   In the present embodiment, an aluminum foil having a thickness of 20 μm is used for the positive electrode current collector sheet c. As the positive electrode active material, lithium manganate, lithium nickelate, lithium cobaltate, or the like is appropriately used, and N-methyl-2-pyrrolidone is used as the solvent. In the positive electrode slurry, in addition to the positive electrode active material, a binder made of PVDF (Polyvinylidene DiFluoride) and a conductor made of acetylene black are dispersed in a solvent.

また、負極用の集電体シートｃには、厚さ１０μｍの銅箔が用いられている。負極活物質にはグラファイト粉末が用いられ、溶媒には、Ｎ−メチル−２−ピロリドンが用いられている。負極用のスラリーには、負極活物質以外に、ＰＶＤＦからなるバインダ、およびアセチレンブラックからなる導電体が溶媒に分散されている。   Further, a copper foil having a thickness of 10 μm is used for the current collector sheet c for the negative electrode. Graphite powder is used as the negative electrode active material, and N-methyl-2-pyrrolidone is used as the solvent. In the slurry for the negative electrode, in addition to the negative electrode active material, a binder made of PVDF and a conductor made of acetylene black are dispersed in a solvent.

塗布部１２によって表面にスラリーが塗布された集電体シートｃは、塗布部１２よりも集電体シートｃの搬送方向の下流にある、スラリーを乾燥させる乾燥部である乾燥装置２内に入り、サポートローラ１３の矢印Ａ方向にあるニップローラ１５まで搬送される。ここで、乾燥装置２は、第１の乾燥部２１と第２の乾燥部２２とを備えている。   The current collector sheet c having the surface coated with the slurry by the coating unit 12 enters the drying device 2, which is a drying unit that dries the slurry, downstream of the coating unit 12 in the conveying direction of the current collector sheet c. Then, it is conveyed to the nip roller 15 in the arrow A direction of the support roller 13. Here, the drying apparatus 2 includes a first drying unit 21 and a second drying unit 22.

第１の乾燥部２１は、第２の乾燥部２２における可動ローラ１４ａ，１４ｂと接触したスラリー表面が可動ローラ１４ａ，１４ｂに転写しない程度にスラリーの乾燥を行う部分である。第２の乾燥部２２には、加熱部２２ａ，２２ｂ、および複数の可動ローラ１４ａ，１４ｂが設けられている。   The first drying unit 21 is a part that dries the slurry to the extent that the surface of the slurry in contact with the movable rollers 14a and 14b in the second drying unit 22 is not transferred to the movable rollers 14a and 14b. The second drying unit 22 is provided with heating units 22a and 22b and a plurality of movable rollers 14a and 14b.

加熱部２２ａ，２２ｂは、第２の乾燥部２２の筐体内にあり、可動ローラ１４ａ，１４ｂにより形成される集電体シートｃの搬送路を間に挟む位置に配設されている。すなわち、加熱部２２ａは第２の乾燥部２２の筐体の天井面付近に配置され、加熱部２２ｂは第２の乾燥部２２の筐体における天井面と対向する底面付近に配置されている。加熱部２２ａ，２２ｂとしては、電力を熱に変換するヒータが用いられ、該ヒータに加熱されることで第２の乾燥部２２内が高温に保たれている。   The heating units 22a and 22b are located in the housing of the second drying unit 22 and are disposed at positions sandwiching the conveyance path of the current collector sheet c formed by the movable rollers 14a and 14b. That is, the heating unit 22a is disposed near the ceiling surface of the housing of the second drying unit 22, and the heating unit 22b is disposed near the bottom surface of the housing of the second drying unit 22 that faces the ceiling surface. As the heating units 22a and 22b, heaters that convert electric power into heat are used, and the interior of the second drying unit 22 is maintained at a high temperature by being heated by the heaters.

可動ローラ１４ａ，１４ｂは、円柱の形状をしており、円柱の軸を中心に回転可能である。本実施形態においては、第２の乾燥部２２の筐体の天井面側にある可動ローラを１４ａとし、第２の乾燥部２２の筐体の底面側にある可動ローラを１４ｂとすると、集電体シートｃは、可動ローラ１４ａと可動ローラ１４ｂとを交互に順次経由してニップローラ１５に達する。   The movable rollers 14a and 14b have a cylindrical shape and can rotate around the axis of the cylinder. In the present embodiment, if the movable roller on the ceiling surface side of the casing of the second drying unit 22 is 14a and the movable roller on the bottom side of the casing of the second drying unit 22 is 14b, The body sheet c reaches the nip roller 15 via the movable roller 14a and the movable roller 14b alternately and sequentially.

すなわち、可動ローラ１４ａは集電体シートｃの搬送方向を加熱部２２ａのある方向から加熱部２２ｂのある方向へと反転させ、可動ローラ１４ｂは集電体シートｃの搬送方向を加熱部２２ｂのある方向から加熱部２２ａのある方向へと反転させる。このように、可動ローラ１４ａ，１４ｂは、集電体シートｃの乾燥装置２内での搬送路を蛇行させる蛇行機構である。これにより、本実施形態に係る電極シート製造装置１では、集電体シートｃがサポートローラ１３から矢印Ａ方向に直線的にニップローラ１５まで搬送される場合よりも、集電体シートｃの乾燥装置２内での搬送路が約１０倍長くなっている。   That is, the movable roller 14a reverses the conveyance direction of the current collector sheet c from the direction of the heating unit 22a to the direction of the heating unit 22b, and the movable roller 14b changes the conveyance direction of the current collector sheet c of the heating unit 22b. It reverses from a certain direction to a certain direction of the heating part 22a. Thus, the movable rollers 14a and 14b are meandering mechanisms that meander the conveying path in the drying device 2 of the current collector sheet c. Thereby, in the electrode sheet manufacturing apparatus 1 according to the present embodiment, the current collector sheet c is dried more than the case where the current collector sheet c is conveyed linearly from the support roller 13 to the nip roller 15 in the arrow A direction. The conveyance path in 2 is about 10 times longer.

乾燥装置２内で集電体シートｃの表面のスラリーが乾燥するための要素として、主に、集電体シートｃの加熱温度および加熱時間が挙げられる。したがって、乾燥装置２内の温度を所定の温度に一定に保つ場合、集電体シートｃの加熱時間、すなわち集電体シートｃが乾燥装置２内に留まる時間が重要である。集電体シートｃは等速で搬送されているため、集電体シートｃが乾燥装置２内に留まる時間は乾燥装置２内での集電体シートｃの搬送路の長さに依存する。   The elements for drying the slurry on the surface of the current collector sheet c in the drying device 2 mainly include the heating temperature and the heating time of the current collector sheet c. Therefore, when the temperature in the drying device 2 is kept constant at a predetermined temperature, the heating time of the current collector sheet c, that is, the time during which the current collector sheet c stays in the drying device 2 is important. Since the current collector sheet c is conveyed at a constant speed, the time during which the current collector sheet c stays in the drying device 2 depends on the length of the conveyance path of the current collector sheet c in the drying device 2.

本実施形態に係る電極シート製造装置１では、第１の乾燥部２１でスラリーの表面をある程度乾燥させた後に集電体シートｃが送り込まれる第２の乾燥部２２における可動ローラ１４ａ，１４ｂによって集電体シートｃの搬送路が蛇行させられている。当該蛇行させられた集電体シートｃの搬送路は、直線的な搬送路に比べてかなり長くなる。そのため、集電体シートｃは、スラリーの表面だけでなく内部まで乾燥するのに十分に長い時間、乾燥装置２内に留まることができる。   In the electrode sheet manufacturing apparatus 1 according to this embodiment, the slurry is collected by the movable rollers 14a and 14b in the second drying unit 22 to which the current collector sheet c is fed after the surface of the slurry is dried to some extent by the first drying unit 21. The conveyance path of the electric sheet c is meandered. The conveyance path of the meandering current collector sheet c is considerably longer than the linear conveyance path. Therefore, the current collector sheet c can remain in the drying device 2 for a sufficiently long time to dry not only the surface of the slurry but also the inside thereof.

一方、可動ローラ１４ａ，１４ｂが設けられていない集電体シートｃを直線的に配置する一般的な乾燥装置の場合、乾燥時間を十分に確保するためには、乾燥部分の炉長を矢印Ａ方向に長くする必要があるため、加熱部も同様に長くなる。特に、このような乾燥装置の場合、装置の清掃等のためのスペースを確保するために、集電体シートｃから天井までの距離と底面側までの距離とを十分に広げておく必要がある。そのため、一般的な乾燥装置では、本実施形態に係る乾燥装置２に比べて、乾燥させる集電体シートｃの体積に対して乾燥部の容積が大きくなり、さらに乾燥部内を所定の温度に保つために要する消費電力も大きくなる。また、乾燥装置が大型化するほど、スラリーの乾燥の時間が長くなってしまうので、消費電力の増大だけでなく、作業効率の低下も生じる。   On the other hand, in the case of a general drying apparatus in which the current collector sheet c not provided with the movable rollers 14a and 14b is linearly arranged, the furnace length of the drying portion is indicated by an arrow A in order to ensure a sufficient drying time. Since it is necessary to make it longer in the direction, the heating part becomes longer as well. In particular, in the case of such a drying apparatus, it is necessary to sufficiently widen the distance from the current collector sheet c to the ceiling and the distance to the bottom side in order to secure a space for cleaning the apparatus and the like. . Therefore, in the general drying device, the volume of the drying unit is larger than the volume of the current collector sheet c to be dried, and the inside of the drying unit is kept at a predetermined temperature as compared with the drying device 2 according to the present embodiment. Therefore, the power consumption required for this also increases. Further, the larger the drying apparatus, the longer the drying time of the slurry, so that not only the power consumption increases but also the work efficiency decreases.

また、一般的な乾燥装置の場合、図２に示した乾燥装置２と同じ炉長にすると、集電体シートｃに塗工したスラリーが十分乾燥しなくなる。このような乾燥装置では、集電体シートｃの表面のスラリーを十分に乾燥させるためには、乾燥装置内の温度を高く設定する必要があるので、結果として乾燥装置の消費電力は大きくなってしまう。また、清掃時には作業上安全な温度になるまで冷却する必要があるが、装置運転時と清掃時との温度差が大きいために作業効率も低下する。   In the case of a general drying device, if the furnace length is the same as that of the drying device 2 shown in FIG. 2, the slurry applied to the current collector sheet c is not sufficiently dried. In such a drying apparatus, in order to sufficiently dry the slurry on the surface of the current collector sheet c, it is necessary to set the temperature in the drying apparatus high. As a result, the power consumption of the drying apparatus increases. End up. Further, although it is necessary to cool to a temperature that is safe for work at the time of cleaning, since the temperature difference between the operation of the apparatus and the time of cleaning is large, the work efficiency is also lowered.

したがって、本実施形態に係る電極シート製造装置１では、乾燥装置２が小型であり、かつ、乾燥装置２内の温度を高く設定する必要がないため、消費電力の低減が図れる。具体的には、電極シート製造装置１の消費電力は、乾燥対象となるスラリーの条件、電極シートの厚み、大きさ等によって異なるが、一般的な乾燥装置を用いた場合に比べて、３０〜７５％となった。また、電極シート製造装置１の設置面積は、一般的な乾燥装置を用いた場合に比べて、２０〜７５％にすることができる。   Therefore, in the electrode sheet manufacturing apparatus 1 according to the present embodiment, the drying apparatus 2 is small and it is not necessary to set the temperature in the drying apparatus 2 high, so that power consumption can be reduced. Specifically, the power consumption of the electrode sheet manufacturing apparatus 1 varies depending on the conditions of the slurry to be dried, the thickness of the electrode sheet, the size, etc. It became 75%. Moreover, the installation area of the electrode sheet manufacturing apparatus 1 can be 20 to 75% as compared with the case where a general drying apparatus is used.

なお、乾燥装置２内の気圧を低くすることによっても、スラリーの乾燥を促進することが可能であり、乾燥装置２は内部を減圧するポンプ等の減圧機構を備えていてもよい。   Note that drying of the slurry can also be promoted by lowering the atmospheric pressure in the drying device 2, and the drying device 2 may be provided with a decompression mechanism such as a pump for decompressing the interior.

可動ローラ１４ａ，１４ｂを通過した集電体シートｃは、集電体シートｃを挟持する一対のローラであるニップローラ１５に到達する。ニップローラ１５に到達した集電体シートｃの表面には、スラリーが乾燥した分散層が形成されており、電極シートが完成している。ニップローラ１５を通過した電極シートは、第２の乾燥部２２の外に出て、回収ローラ１６に巻き付けられて回収される。その後、電極シートは、各電極に切り分けられる。   The current collector sheet c that has passed through the movable rollers 14a and 14b reaches a nip roller 15 that is a pair of rollers that sandwich the current collector sheet c. A dispersion layer obtained by drying the slurry is formed on the surface of the current collector sheet c that has reached the nip roller 15, and the electrode sheet is completed. The electrode sheet that has passed through the nip roller 15 goes out of the second drying unit 22, is wound around the collection roller 16, and is collected. Thereafter, the electrode sheet is cut into each electrode.

図３は本実施形態に係る電極シート製造装置１の停止時の概略構成図である。電極シート製造装置１では、可動ローラ１４ａ，１４ｂが、図２に示す第１の位置と、図３に示す第２の位置と、を移動可能である。   FIG. 3 is a schematic configuration diagram when the electrode sheet manufacturing apparatus 1 according to the present embodiment is stopped. In the electrode sheet manufacturing apparatus 1, the movable rollers 14a and 14b are movable between the first position shown in FIG. 2 and the second position shown in FIG.

電極シート製造装置１は、停止時に、可動ローラ１４ａ，１４ｂがともに互いに近接する方向に移動し、集電体シートｃのサポートローラ１３からニップローラ１５までの搬送路が直線的になる。この状態で、乾燥装置２内の清掃が行われる。   When the electrode sheet manufacturing apparatus 1 is stopped, both of the movable rollers 14a and 14b move in directions close to each other, and the conveyance path from the support roller 13 to the nip roller 15 of the current collector sheet c becomes linear. In this state, the inside of the drying device 2 is cleaned.

すなわち、可動ローラ１４ａ，１４ｂが乾燥装置２内の中央領域に集まっているため、可動ローラ１４ａ，１４ｂの清掃が容易となるだけでなく、熱源から遠い位置での清掃となるため安全性が向上する。   That is, since the movable rollers 14a and 14b are gathered in the central region in the drying device 2, not only the cleaning of the movable rollers 14a and 14b is facilitated, but also the safety is improved because the cleaning is performed at a position far from the heat source. To do.

さらに、本実施形態に係る電極シート製造装置１では、集電体シートｃが別の集電体シートｃに手動で切り替えられる際に、供給ローラから回収ローラまでの搬送路に予め集電体シートｃが配置される。これにより、切り替え後の集電体シートｃにスラリーを塗布できるようになる。このような手動での集電体シートｃの切り替えは、図３に示すように第２の乾燥部２２内の集電体シートｃの搬送路を直線的にしておくことで安全に短時間で行うことができるようになる。   Furthermore, in the electrode sheet manufacturing apparatus 1 according to the present embodiment, when the current collector sheet c is manually switched to another current collector sheet c, the current collector sheet is preliminarily placed in the conveyance path from the supply roller to the collection roller. c is arranged. Thereby, a slurry can be apply | coated to the collector sheet c after switching. Such manual switching of the current collector sheet c can be performed safely in a short time by keeping the conveyance path of the current collector sheet c in the second drying section 22 straight as shown in FIG. Will be able to do.

このように、本実施形態に係る電極シート製造装置１では、乾燥装置２内の清掃が短時間で十分に行われることが可能である。乾燥装置２内の清掃時間は、可動ローラ１４ａ，１４ｂが図２に示すような搬送路を蛇行させるような第１の位置にある場合に比べて短くなる。清掃時間は集電体シートｃの切り替え、品種の変更等の条件によっても異なるが、蛇行しているままの状態に比べて２０〜７５％となった。   Thus, in the electrode sheet manufacturing apparatus 1 according to the present embodiment, the cleaning in the drying apparatus 2 can be sufficiently performed in a short time. The cleaning time in the drying device 2 is shorter than when the movable rollers 14a and 14b are in the first position that meanders the conveyance path as shown in FIG. Although the cleaning time differs depending on conditions such as switching of the current collector sheet c and changing the product type, the cleaning time was 20 to 75% as compared with the meandering state.

なお、図３に示した可動ローラ１４ａ，１４ｂが第２の位置にある場合、集電体シートｃの搬送路がサポートローラ１３からニップローラ１５まで厳密に一直線状でなくてもよい。可動ローラ１４ａ，１４ｂの第２の位置は、少なくとも第１の位置よりも集電体シートｃの搬送路を短くする位置であれば、乾燥装置２内の清掃が容易となる効果が得られる。   When the movable rollers 14a and 14b shown in FIG. 3 are in the second position, the conveyance path of the current collector sheet c may not be strictly straight from the support roller 13 to the nip roller 15. If the second position of the movable rollers 14a and 14b is a position that makes the conveyance path of the current collector sheet c shorter than at least the first position, an effect of facilitating cleaning in the drying device 2 can be obtained.

１ 電極シート製造装置
２ 乾燥装置
１１ 供給ローラ
１２ 塗布部
１３ サポートローラ
１４ａ，１４ｂ 可動ローラ
１５ ニップローラ
１６ 回収ローラ
２１ 第１の乾燥部
２２ 第２の乾燥部
２２ａ，２２ｂ 加熱部 DESCRIPTION OF SYMBOLS 1 Electrode sheet manufacturing apparatus 2 Drying device 11 Supply roller 12 Application | coating part 13 Support roller 14a, 14b Movable roller 15 Nip roller 16 Collection | recovery roller 21 1st drying part 22 2nd drying part 22a, 22b Heating part

Claims (5)

連続的に搬送される集電体シートの表面に電極活物質を含む分散層を形成するリチウムイオン二次電池用電極シート製造装置であって、
集電体シートの表面に電極活物質を含むスラリーを塗布する塗布部と、該塗布部よりも集電体シートの搬送方向の下流にあり、集電体シートを加熱する乾燥部と、を有し、
前記乾燥部は、蛇行した集電体シートの搬送路を形成する蛇行機構を備えていることを特徴とする電極シート製造装置。 An electrode sheet manufacturing apparatus for a lithium ion secondary battery that forms a dispersion layer containing an electrode active material on the surface of a current collector sheet that is continuously conveyed,
A coating unit that applies a slurry containing an electrode active material to the surface of the current collector sheet; and a drying unit that is downstream of the coating unit in the conveying direction of the current collector sheet and heats the current collector sheet. And
The said drying part is equipped with the meandering mechanism which forms the conveyance path of the meandering collector sheet, The electrode sheet manufacturing apparatus characterized by the above-mentioned. 前記蛇行機構は回転可能な複数のローラを備えている、請求項１に記載の電極シート製造装置。   The electrode sheet manufacturing apparatus according to claim 1, wherein the meandering mechanism includes a plurality of rotatable rollers. 前記各ローラは、集電体シートの搬送方向を反転させる、請求項２に記載の電極シート製造装置。   The said each roller is an electrode sheet manufacturing apparatus of Claim 2 which reverses the conveyance direction of a collector sheet. 前記各ローラは、前記搬送路を蛇行させる第１の位置と、該第１の位置より前記搬送路を短くする第２の位置と、の間を移動可能である、請求項２または３に記載の電極シート製造装置。   The said each roller is movable between the 1st position which meanders the said conveyance path, and the 2nd position which makes the said conveyance path shorter than this 1st position. Electrode sheet manufacturing equipment. 前記第２の位置にある前記複数のローラは、集電体シートを直線的に搬送する、請求項４に記載の電極シート製造装置。   The electrode sheet manufacturing apparatus according to claim 4, wherein the plurality of rollers in the second position linearly convey the current collector sheet.
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