JP2019036453A - Manufacturing method of electrode plate - Google Patents

Manufacturing method of electrode plate Download PDF

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JP2019036453A
JP2019036453A JP2017156249A JP2017156249A JP2019036453A JP 2019036453 A JP2019036453 A JP 2019036453A JP 2017156249 A JP2017156249 A JP 2017156249A JP 2017156249 A JP2017156249 A JP 2017156249A JP 2019036453 A JP2019036453 A JP 2019036453A
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undried
electrode layer
electrode plate
roll
negative electrode
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JP6870530B2 (en
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隆彦 中野
Takahiko Nakano
隆彦 中野
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Toyota Motor Corp
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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
    • 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
    • Y02E60/13—Energy storage using capacitors

Abstract

To provide a manufacturing method of an electrode plate capable of preventing an undried electrode layer from being adhered to the roll surface of a bending conveyance roll and being peeled off from the undried electrode plate.SOLUTION: The manufacturing method of an electrode plate 1 comprises: a step S1 of forming an undried electrode plate 1x which has an undried electrode layer 5x on a current collector foil 3; and a dry step S2 of heat-drying the undried electrode layer 5x to form an electrode layer 5. The dry step S2 includes: a cooling-bending conveyance step S22 in which the undried electrode layer 5x is cooled to a predetermined temperature T1 or less before transporting the undried electrode plate 1x while bending the same in a thickness direction GH by bringing the undried electrode layer 5x during drying into contact with the roll surface 125c of a bending-transporting roll 125; and a re-heating and drying step S23 to heat the cooled undried electrode layer 5x again.SELECTED DRAWING: Figure 6

Description

本発明は、帯状の集電箔と、この集電箔上に帯状に形成された電極層とを備える電極板の製造方法に関する。   The present invention relates to a method for manufacturing an electrode plate comprising a strip-shaped current collector foil and an electrode layer formed in a strip shape on the current collector foil.

リチウムイオン二次電池、リチウムイオンキャパシタ等の蓄電デバイスに用いられる電極板として、帯状の集電箔とこの集電箔上に形成された帯状の電極層とを備える電極板が知られている。このような電極板は、例えば、活物質、結着剤、溶媒等を含む活物質ペーストを帯状の集電箔上に塗布して、集電箔上に未乾燥電極層を形成した後、この未乾燥電極板を長手方向に搬送しつつ、未乾燥電極層を加熱炉で加熱乾燥させて電極層を形成することにより製造される。   As an electrode plate used for an electricity storage device such as a lithium ion secondary battery and a lithium ion capacitor, an electrode plate including a strip-shaped current collector foil and a strip-shaped electrode layer formed on the current collector foil is known. Such an electrode plate is obtained by, for example, applying an active material paste containing an active material, a binder, a solvent, etc. on a strip-shaped current collector foil to form an undried electrode layer on the current collector foil. It is manufactured by forming an electrode layer by heating and drying an undried electrode layer in a heating furnace while conveying the undried electrode plate in the longitudinal direction.

例えば特許文献１に、未乾燥電極層を加熱乾燥させるための乾燥装置が開示されている（特許文献１の特許請求の範囲及び図１等を参照）。この特許文献１の乾燥装置では、乾燥装置が長大化するのを避けるべく、乾燥室の内部に複数の折り返しロールを設け、各々の折り返しロールで未乾燥電極板を厚み方向に交互に折り返すことにより、乾燥室内における搬送距離を長く（乾燥路を長く）取っている。   For example, Patent Document 1 discloses a drying apparatus for heating and drying an undried electrode layer (see Claims of Patent Document 1 and FIG. 1 and the like). In the drying apparatus of Patent Document 1, in order to avoid the drying apparatus from becoming long, a plurality of folding rolls are provided inside the drying chamber, and the undried electrode plates are alternately folded in the thickness direction by the folding rolls. The transport distance in the drying chamber is long (the drying path is long).

特開２０１６−６１４７３号公報JP, 2006-61473, A

しかしながら、乾燥途中の未乾燥電極板を折り返しロールで折り返すにあたり、未乾燥電極層が折り返しロールのロール表面に接触すると、未乾燥電極層がロール表面に付着して未乾燥電極層の一部が未乾燥電極板から剥がれてしまうことがある。加熱乾燥によって未乾燥電極層の温度が高くなると、未乾燥電極層に含まれる結着剤が軟化して、未乾燥電極層がロール表面に付着し易くなるためと考えられる。   However, when the undried electrode plate in the middle of drying is folded back by the folding roll, if the undried electrode layer comes into contact with the roll surface of the folding roll, the undried electrode layer adheres to the roll surface and a part of the undried electrode layer is not yet dried. It may peel off from the dry electrode plate. It is considered that when the temperature of the undried electrode layer is increased by heat drying, the binder contained in the undried electrode layer is softened and the undried electrode layer is easily attached to the roll surface.

本発明は、かかる現状に鑑みてなされたものであって、乾燥途中の未乾燥電極層を曲げ搬送ロールのロール表面に接触させて未乾燥電極板を曲げて搬送するにあたり、未乾燥電極層がロール表面に付着して未乾燥電極層が未乾燥電極板から剥がれるのを抑制できる電極板の製造方法を提供することを目的とする。   The present invention has been made in view of the current situation, and when an undried electrode layer being dried is brought into contact with the roll surface of a bending conveyance roll to bend and convey an undried electrode plate, It aims at providing the manufacturing method of the electrode plate which can suppress that an undried electrode layer adheres to a roll surface and peels from an undried electrode plate.

上記課題を解決するための本発明の一態様は、帯状の集電箔と、上記集電箔の長手方向に沿って上記集電箔上に帯状に形成された電極層と、を備える電極板の製造方法であって、結着剤及び溶媒を含む未乾燥電極層を上記集電箔上に有する未乾燥電極板を形成する未乾燥電極層形成工程と、上記未乾燥電極板を上記長手方向に搬送しつつ、上記未乾燥電極層を加熱乾燥させて上記電極層を形成する乾燥工程と、を備え、上記乾燥工程は、上記未乾燥電極板の乾燥途中の上記未乾燥電極層を曲げ搬送ロールのロール表面に接触させて上記未乾燥電極板を厚み方向に曲げて搬送するにあたり、上記未乾燥電極層を予め定めた温度Ｔ１以下に冷却した上で、上記未乾燥電極層を上記曲げ搬送ロールの上記ロール表面に接触させる冷却曲げ搬送工程と、上記冷却曲げ搬送工程の後、冷却した上記未乾燥電極層を再び加熱乾燥させる再加熱乾燥工程と、を含む電極板の製造方法である。   One aspect of the present invention for solving the above problems is an electrode plate comprising a strip-shaped current collector foil and an electrode layer formed on the current collector foil along the longitudinal direction of the current collector foil. A method of forming an undried electrode layer having an undried electrode layer containing a binder and a solvent on the current collector foil, and the undried electrode plate in the longitudinal direction. A drying step of heating and drying the undried electrode layer to form the electrode layer, wherein the drying step bends and conveys the undried electrode layer during the drying of the undried electrode plate. When the dry electrode plate is brought into contact with the roll surface of the roll and bent and transported in the thickness direction, the dry electrode layer is cooled to a predetermined temperature T1 or lower and the dry electrode layer is bent and transported. A cooling and bending conveying step for contacting the roll surface of the roll; After the cooling folded conveyance step, the re-heating and drying step for heating and drying the cooled the undried electrode layer again, an electrode plate manufacturing method of including.

前述のように、乾燥工程における加熱乾燥によって未乾燥電極層の温度が高くなると、未乾燥電極層に含まれる結着剤が軟化する。このため、未乾燥電極層が曲げ搬送ロールのロール表面に接触したときに、未乾燥電極層がロール表面に付着して未乾燥電極層が未乾燥電極板から剥がれ易くなる。これに対し、上述の電極板の製造方法では、乾燥工程の冷却曲げ搬送工程において、乾燥途中の未乾燥電極層を曲げ搬送ロールのロール表面に接触させて未乾燥電極板を曲げて搬送するにあたり、未乾燥電極層を予め定めた温度Ｔ１以下に冷却した上で、未乾燥電極層を曲げ搬送ロールのロール表面に接触させる。このようにすると、未乾燥電極層に含まれる結着剤が軟化していない状態で未乾燥電極層をロール表面に接触させることができ、未乾燥電極層のロール表面への付着性を下げることができるので、未乾燥電極層がロール表面に付着して未乾燥電極板から剥がれる不具合を抑制できる。
なお、結着剤としては、熱可塑性樹脂からなる結着剤を用いる。具体的には、例えば、カルボキシメチルセルロース（ＣＭＣ）や、ビフェニル、ＰＶＤＦなどが挙げられる。 As described above, when the temperature of the undried electrode layer is increased by heat drying in the drying step, the binder contained in the undried electrode layer is softened. For this reason, when an undried electrode layer contacts the roll surface of a bending conveyance roll, an undried electrode layer adheres to a roll surface and an undried electrode layer becomes easy to peel from an undried electrode plate. On the other hand, in the above-described electrode plate manufacturing method, in the cooling bending conveyance step of the drying step, the undried electrode layer in the middle of drying is brought into contact with the roll surface of the bending conveyance roll to bend and convey the undried electrode plate. The undried electrode layer is cooled to a predetermined temperature T1 or lower, and the undried electrode layer is brought into contact with the roll surface of the bending conveyance roll. In this way, the undried electrode layer can be brought into contact with the roll surface in a state where the binder contained in the undried electrode layer is not softened, and the adhesion of the undried electrode layer to the roll surface is reduced. Therefore, the problem that the undried electrode layer adheres to the roll surface and is peeled off from the undried electrode plate can be suppressed.
As the binder, a binder made of a thermoplastic resin is used. Specifically, for example, carboxymethylcellulose (CMC), biphenyl, PVDF and the like can be mentioned.

更に、上記の記載の電極板の製造方法であって、前記曲げ搬送ロールの前記ロール表面は、ポリイミドからなる電極板の製造方法とするのが好ましい。   Furthermore, it is a manufacturing method of an electrode plate as described above, and the roll surface of the bending conveyance roll is preferably a manufacturing method of an electrode plate made of polyimide.

上述の電極板の製造方法では、曲げ搬送ロールのロール表面がポリイミドからなる。これにより、未乾燥電極層のロール表面からの離型性が良くなるため、未乾燥電極層がロール表面に付着して未乾燥電極板から剥がれる不具合をより効果的に抑制できる。   In the above-described electrode plate manufacturing method, the roll surface of the bending conveyance roll is made of polyimide. Thereby, since the releasability from the roll surface of an undried electrode layer becomes good, the problem that an undried electrode layer adheres to a roll surface and peels from an undried electrode plate can be suppressed more effectively.

更に、上記のいずれかに記載の電極板の製造方法であって、前記冷却曲げ搬送工程は、前記再加熱乾燥工程の雰囲気よりも低温の外気に曝して冷却した前記未乾燥電極層を、上記外気に曝した前記曲げ搬送ロールの前記ロール表面に接触させる電極板の製造方法とするのが好ましい。   Furthermore, in the method for manufacturing an electrode plate according to any one of the above, the cooling bending conveyance step includes cooling the undried electrode layer that has been cooled by exposure to outside air at a temperature lower than the atmosphere of the reheating drying step, It is preferable to use a method for producing an electrode plate that is brought into contact with the roll surface of the bending conveyance roll exposed to the outside air.

上述の電極板の製造方法では、未乾燥電極層を再加熱乾燥工程の雰囲気よりも低温の外気に曝して冷却するので、未乾燥電極層を冷却するための冷却装置などを要しない。また、曲げ搬送ロールを再加熱乾燥工程の雰囲気よりも低温の外気に曝しているので、ロール表面の温度が低く、未乾燥電極層がロール表面に付着して未乾燥電極板から剥がれる不具合をより効果的に抑制できる。   In the above-described electrode plate manufacturing method, the undried electrode layer is cooled by being exposed to outside air at a temperature lower than that of the atmosphere of the reheat drying process, and thus a cooling device or the like for cooling the undried electrode layer is not required. In addition, since the bending conveyance roll is exposed to the outside air at a temperature lower than the atmosphere of the reheating drying process, the temperature of the roll surface is low, and the undried electrode layer adheres to the roll surface and peels off from the undried electrode plate. It can be effectively suppressed.

実施形態に係る負極板の斜視図である。It is a perspective view of the negative electrode plate which concerns on embodiment. 実施形態に係る負極板の製造方法を示すフローチャートである。It is a flowchart which shows the manufacturing method of the negative electrode plate which concerns on embodiment. 実施形態に係る負極板の製造方法のうち、第１乾燥工程について示すフローチャートである。It is a flowchart shown about a 1st drying process among the manufacturing methods of the negative electrode plate which concerns on embodiment. 実施形態に係る負極板の製造方法のうち、第２乾燥工程について示すフローチャートである。It is a flowchart shown about a 2nd drying process among the manufacturing methods of the negative electrode plate which concerns on embodiment. 実施形態に係り、未乾燥電極層形成装置を用いて、集電箔上に未乾燥第１電極層を形成する様子を示す説明図である。It is explanatory drawing which shows a mode that an undried 1st electrode layer is formed on current collection foil concerning an embodiment using an undried electrode layer forming apparatus. 実施形態に係り、第１乾燥装置を用いて、未乾燥第１電極層から第１電極層を形成する様子を示す説明図である。It is explanatory drawing which shows a mode that it concerns on embodiment and forms a 1st electrode layer from an undried 1st electrode layer using a 1st drying apparatus. 実施形態に係り、第２乾燥装置を用いて、未乾燥第２電極層から第２電極層を形成する様子を示す説明図である。It is explanatory drawing which shows a mode that it concerns on embodiment and forms a 2nd electrode layer from an undried 2nd electrode layer using a 2nd drying apparatus. 比較例に係り、乾燥装置を用いて、未乾燥電極層から電極層を形成する様子を示す説明図である。It is explanatory drawing which shows a mode that it concerns on a comparative example and forms an electrode layer from an undried electrode layer using a drying apparatus.

以下、本発明の実施形態を、図面を参照しつつ説明する。図１に、本実施形態に係る負極板（電極板）１の斜視図を示す。なお、以下では、負極板１の長手方向ＥＨ、幅方向ＦＨ及び厚み方向ＧＨを図１に示す方向と定めて説明する。この負極板１は、ハイブリッドカーやプラグインハイブリッドカー、電気自動車等の車両などに搭載される角型で密閉型のリチウムイオン二次電池を製造するのに、具体的には、扁平状捲回型の電極体を製造するのに用いられる帯状の負極板である。   Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a negative electrode plate (electrode plate) 1 according to this embodiment. In the following description, the longitudinal direction EH, the width direction FH, and the thickness direction GH of the negative electrode plate 1 are defined as the directions shown in FIG. The negative electrode plate 1 is used to manufacture a rectangular and sealed lithium ion secondary battery mounted on a vehicle such as a hybrid car, a plug-in hybrid car, and an electric vehicle. It is a strip-shaped negative electrode plate used for manufacturing a type electrode body.

負極板１は、長手方向ＥＨに延びる帯状の銅箔からなる集電箔３を有する。この集電箔３の第１主面３ａのうち、幅方向ＦＨの一部でかつ長手方向ＥＨに延びる領域上には、第１電極層５が帯状に形成されている。また、集電箔３の反対側の第２主面３ｂのうち、幅方向ＦＨの一部でかつ長手方向ＥＨに延びる領域上にも、第２電極層６が帯状に形成されている。このうち第１電極層５は、集電箔３側に位置する活物質層５ｃと、その上に形成されて、この第１電極層５の表面をなすセラミック層５ｄとからなる。また、第２電極層６は、集電箔３側に位置する活物質層６ｃと、その上に形成されて、この第２電極層６の表面をなすセラミック層６ｄとからなる。   The negative electrode plate 1 has a current collector foil 3 made of a strip-shaped copper foil extending in the longitudinal direction EH. On the first main surface 3a of the current collector foil 3, the first electrode layer 5 is formed in a strip shape on a region that is a part of the width direction FH and extends in the longitudinal direction EH. The second electrode layer 6 is also formed in a strip shape on the second main surface 3b on the opposite side of the current collector foil 3 on a region extending in the longitudinal direction EH and part of the width direction FH. Among these, the first electrode layer 5 includes an active material layer 5 c positioned on the current collector foil 3 side and a ceramic layer 5 d formed thereon and forming the surface of the first electrode layer 5. The second electrode layer 6 includes an active material layer 6 c located on the current collector foil 3 side and a ceramic layer 6 d formed on the active material layer 6 c and forming the surface of the second electrode layer 6.

各活物質層５ｃ，６ｃは、負極活物質（活物質）粒子１１及び結着剤１２からなる。本実施形態では、負極活物質粒子１１として黒鉛粒子を、結着剤１２としてカルボキシメチルセルロース（ＣＭＣ）を用いている。一方、各セラミック層５ｄ，６ｄは、耐熱層（HRL：heat resistance layer）であり、セラミック粒子１５及び結着剤１６からなる。本実施形態では、セラミック粒子１５として酸化アルミニウム粉末を、結着剤１６としてＣＭＣ及びアクリル系バインダを用いている。
負極板１のうち幅方向ＦＨの片方の端部は、厚み方向ＧＨに第１電極層５及び第２電極層６が存在せず、集電箔３が厚み方向ＧＨに露出した露出部１ｍとなっている。 Each of the active material layers 5 c and 6 c is composed of negative electrode active material (active material) particles 11 and a binder 12. In this embodiment, graphite particles are used as the negative electrode active material particles 11 and carboxymethyl cellulose (CMC) is used as the binder 12. On the other hand, each of the ceramic layers 5 d and 6 d is a heat resistance layer (HRL) and is composed of ceramic particles 15 and a binder 16. In the present embodiment, aluminum oxide powder is used as the ceramic particles 15, and CMC and an acrylic binder are used as the binder 16.
One end of the negative electrode plate 1 in the width direction FH has an exposed portion 1m in which the first electrode layer 5 and the second electrode layer 6 are not present in the thickness direction GH and the current collector foil 3 is exposed in the thickness direction GH. It has become.

次いで、上記負極板１の製造方法について説明する（図２〜図７参照）。まず、活物質層５ｃ，６ｃを形成するために、負極活物質粒子１１（本実施形態では、黒鉛粒子）、結着剤１２（本実施形態では、ＣＭＣ）及び溶媒１３（本実施形態では、水）を含む湿潤粒子２２からなる粒子集合体２１を用意する。この粒子集合体２１（湿潤粒子２２）は、以下の手法により製造する。即ち、材料の混合及び造粒を行うことが可能な攪拌式混合造粒装置（不図示）を用意する。まず、この攪拌式混合造粒装置内に負極活物質粒子１１を投入して混合し、更に、溶媒１３に結着剤１２を溶解させた結着剤溶液を加えて混合し、造粒する。これにより、平均粒径が１〜５ｍｍ（本実施形態では、２ｍｍ）で、固形分率が７０〜９０ｗｔ％（本実施形態では、８０ｗｔ％）の湿潤粒子２２からなる粒子集合体２１を得る。   Next, a method for manufacturing the negative electrode plate 1 will be described (see FIGS. 2 to 7). First, in order to form the active material layers 5c and 6c, the negative electrode active material particles 11 (graphite particles in the present embodiment), the binder 12 (CMC in the present embodiment), and the solvent 13 (in the present embodiment, A particle aggregate 21 composed of wet particles 22 containing water) is prepared. The particle aggregate 21 (wet particles 22) is manufactured by the following method. That is, a stirring type mixing granulator (not shown) capable of mixing and granulating materials is prepared. First, the negative electrode active material particles 11 are charged and mixed in the stirring type mixing granulator, and further, a binder solution in which the binder 12 is dissolved in the solvent 13 is added and mixed to granulate. Thereby, the particle aggregate 21 composed of the wet particles 22 having an average particle diameter of 1 to 5 mm (2 mm in this embodiment) and a solid content of 70 to 90 wt% (80 wt% in this embodiment) is obtained.

また、セラミック層５ｄ，６ｄを形成するために、セラミックペーストを用意しておく。具体的には、セラミック粒子１５（本実施形態では、酸化アルミニウム粉末）及び結着剤１６（本実施形態では、ＣＭＣ及びアクリル系バインダ）を溶媒１７（本実施形態では、水）と共に混練して、セラミックペーストを得る。   Further, a ceramic paste is prepared for forming the ceramic layers 5d and 6d. Specifically, the ceramic particles 15 (in this embodiment, aluminum oxide powder) and the binder 16 (in this embodiment, CMC and an acrylic binder) are kneaded together with the solvent 17 (in this embodiment, water). Get a ceramic paste.

そして、まず「未乾燥第１電極層形成工程Ｓ１」において、図５に示す未乾燥電極層形成装置２００を用いて、未乾燥第１電極層５ｘを集電箔３上に有する未乾燥片側負極板（未乾燥電極板）１ｘを形成する。具体的には、帯状の集電箔３の第１主面３ａ上に、長手方向ＥＨに帯状に未乾燥第１電極層５ｘを形成する。   First, in the “undried first electrode layer forming step S1”, an undried one-side negative electrode having the undried first electrode layer 5x on the current collector foil 3 using the undried electrode layer forming apparatus 200 shown in FIG. A plate (undried electrode plate) 1x is formed. Specifically, the undried first electrode layer 5x is formed in a strip shape in the longitudinal direction EH on the first main surface 3a of the strip-shaped current collector foil 3.

未乾燥電極層形成装置２００は、３本のロールを有する。具体的には、未乾燥電極層形成装置２００は、第１ロール２１０と、この第１ロール２１０に第１間隙ＫＧ１を介して平行に配置された第２ロール２２０と、この第２ロール２２０に第２間隙ＫＧ２を介して平行に配置された第３ロール２３０とを備える。また、未乾燥電極層形成装置２００は、第１ロール２１０と第２ロール２２０との第１間隙ＫＧ１の上方に、粒子集合体２１を第１間隙ＫＧ１に向けて供給する集合体供給部２４０を備える。   The undried electrode layer forming apparatus 200 has three rolls. Specifically, the undried electrode layer forming apparatus 200 includes a first roll 210, a second roll 220 arranged in parallel to the first roll 210 via a first gap KG1, and a second roll 220. And a third roll 230 arranged in parallel via the second gap KG2. In addition, the undried electrode layer forming apparatus 200 includes an aggregate supply unit 240 that supplies the particle aggregate 21 toward the first gap KG1 above the first gap KG1 between the first roll 210 and the second roll 220. Prepare.

この未乾燥電極層形成装置２００を用いて集電箔３上に未乾燥活物質層５ｃｘを形成するにあたり、第１〜第３ロール２１０，２２０，２３０を、図５中に矢印で示す回転方向にそれぞれ回転させる。即ち、第１ロール２１０及び第３ロール２３０は、同じ回転方向（本実施形態では時計回り）に回転させ、第２ロール２２０は、これらとは逆方向（本実施形態では反時計回り）に回転させる。また、帯状の集電箔３を供給ロール（不図示）から引き出して第３ロール２３０に巻き付けることにより、集電箔３について第２ロール２２０と第３ロール２３０との間を通過させる。   In forming the undried active material layer 5cx on the current collector foil 3 using the undried electrode layer forming apparatus 200, the first to third rolls 210, 220, and 230 are rotated in the direction indicated by the arrows in FIG. Rotate each. That is, the first roll 210 and the third roll 230 are rotated in the same rotation direction (clockwise in the present embodiment), and the second roll 220 is rotated in the opposite direction (counterclockwise in the present embodiment). Let Further, the current collector foil 3 is pulled out from a supply roll (not shown) and wound around the third roll 230, thereby allowing the current collector foil 3 to pass between the second roll 220 and the third roll 230.

粒子集合体２１（湿潤粒子２２）を集合体供給部２４０に投入すると、粒子集合体２１は、第１ロール２１０と第２ロール２２０との間の第１間隙ＫＧ１に向けて供給される。第１ロール２１０と第２ロール２２０との間を通った粒子集合体２１は、膜状の未乾燥活物質膜２１ｘとなり、図５中、下方に押し出される。この未乾燥活物質膜２１ｘは、第２ロール２２０上に保持されつつ、第３ロール２３０側に向けて搬送され、第２ロール２２０と第３ロール２３０との間で、集電箔３の第１主面３ａ上に転写される。これにより、集電箔３の第１主面３ａ上に未乾燥活物質層５ｃｘが形成される。   When the particle aggregate 21 (wet particles 22) is charged into the aggregate supply unit 240, the particle aggregate 21 is supplied toward the first gap KG1 between the first roll 210 and the second roll 220. The particle aggregate 21 that has passed between the first roll 210 and the second roll 220 becomes a film-like undried active material film 21x, and is extruded downward in FIG. The undried active material film 21x is conveyed toward the third roll 230 while being held on the second roll 220, and between the second roll 220 and the third roll 230, the second current collector foil 3 Transferred onto one main surface 3a. Thereby, the undried active material layer 5cx is formed on the first main surface 3a of the current collector foil 3.

また、未乾燥電極層形成装置２００は、ダイコータ２５０を備える。集電箔３上に未乾燥活物質層５ｃｘが形成された後は、このダイコータ２５０によって、前述のセラミックペーストが未乾燥活物質層５ｃｘ上に塗布され、未乾燥活物質層５ｃｘ上に未乾燥セラミック層５ｄｘが形成される。これにより、集電箔３の第１主面３ａ上に、未乾燥活物質層５ｃｘ及び未乾燥セラミック層５ｄｘからなる未乾燥第１電極層５ｘを有する未乾燥片側負極板１ｘが形成される。   The undried electrode layer forming apparatus 200 includes a die coater 250. After the undried active material layer 5cx is formed on the current collector foil 3, the above-mentioned ceramic paste is applied onto the undried active material layer 5cx by the die coater 250, and undried on the undried active material layer 5cx. A ceramic layer 5dx is formed. Thereby, the undried one-side negative electrode plate 1x having the undried first electrode layer 5x composed of the undried active material layer 5cx and the undried ceramic layer 5dx is formed on the first main surface 3a of the current collector foil 3.

次に、「第１乾燥工程Ｓ２」（図２及び図３参照）において、図６に示す第１乾燥装置１００を用いて、未乾燥片側負極板１ｘを長手方向ＥＨに搬送しつつ、未乾燥第１電極層５ｘを加熱乾燥させて第１電極層５を形成する。第１乾燥装置１００は、壁部１１１によって外部と仕切られた乾燥室１１０を備える。この乾燥室１１０は、排気により乾燥室１１０の内部の気圧が外部の気圧よりも１〜５Ｐａ低い気圧に調整されている。これにより、乾燥室１１０の内部から外部に熱風が漏れ出るのを防止している。また、乾燥室１１０の内部には、複数（図６の例では９個）のロール径８５ｍｍの搬送ロール１２１、及び、複数（図６の例では３個）のロール径８５ｍｍの折り返しロール１２３（１２３Ａ，１２３Ｂ，１２３Ｃ）が配置されている。   Next, in the “first drying step S2” (see FIGS. 2 and 3), the undried one-side negative electrode plate 1x is conveyed in the longitudinal direction EH using the first drying device 100 shown in FIG. The first electrode layer 5x is formed by heating and drying the first electrode layer 5x. The first drying apparatus 100 includes a drying chamber 110 that is partitioned from the outside by a wall 111. In the drying chamber 110, the pressure inside the drying chamber 110 is adjusted to 1 to 5 Pa lower than the outside pressure by exhaust. This prevents hot air from leaking from the inside of the drying chamber 110 to the outside. Further, inside the drying chamber 110, a plurality of (9 in the example of FIG. 6) transport rolls 121 with a roll diameter of 85 mm and a plurality of (3 in the example of FIG. 6) folding rolls 123 with a roll diameter of 85 mm ( 123A, 123B, 123C) are arranged.

搬送ロール１２１は、未乾燥片側負極板１ｘのうち集電箔３の第２主面３ｂ（未乾燥第１電極層５ｘが形成されていない側）に接触して、水平方向ＣＨに向けて未乾燥片側負極板１ｘを長手方向ＥＨに搬送するものである。これらの搬送ロール１２１のロール表面１２１ｃは、ポリイミド層で被覆されている。
一方、折り返しロール１２３（１２３Ａ〜１２３Ｃ）は、未乾燥片側負極板１ｘのうち集電箔３の第２主面３ｂ（未乾燥第１電極層５ｘが形成されていない側）に接触して、未乾燥片側負極板１ｘをＵ字状に折り返して搬送するものである。これら折り返しロール１２３（１２３Ａ〜１２３Ｃ）のロール表面１２３ｃ（１２３Ａｃ〜１２３Ｃｃ）も、ポリイミド層で被覆されている。 The transport roll 121 is in contact with the second main surface 3b (the side on which the undried first electrode layer 5x is not formed) of the current collector foil 3 of the undried one-side negative electrode plate 1x and is not directed toward the horizontal direction CH. The dried one-side negative electrode plate 1x is conveyed in the longitudinal direction EH. The roll surface 121c of these conveyance rolls 121 is covered with a polyimide layer.
On the other hand, the folding roll 123 (123A to 123C) is in contact with the second main surface 3b (the side where the undried first electrode layer 5x is not formed) of the current collector foil 3 in the undried one-side negative electrode plate 1x. The undried one-side negative electrode plate 1x is folded and conveyed in a U shape. The roll surface 123c (123Ac-123Cc) of these folding rolls 123 (123A-123C) is also covered with a polyimide layer.

また、第１乾燥装置１００は、乾燥室１１０の外部に（図６中、乾燥室１１０の左方に）、複数（図６の例では６個）のロール径８５ｍｍの曲げ搬送ロール１２５（１２５Ａ〜１２５Ｆ）を備える。これらの曲げ搬送ロール１２５（１２５Ａ〜１２５Ｆ）は、未乾燥片側負極板１ｘのうち未乾燥第１電極層５ｘに接触して、未乾燥片側負極板１ｘを厚み方向ＧＨに９０度曲げて搬送するものである。図６に示すように、２つの曲げ搬送ロール１２５が１組となって、未乾燥片側負極板１ｘの搬送方向を１８０度変えている。これらの曲げ搬送ロール１２５（１２５Ａ〜１２５Ｆ）のロール表面１２５ｃ（１２５Ａｃ〜１２５Ｆｃ）も、ポリイミド層で被覆されている。   Further, the first drying apparatus 100 is provided outside the drying chamber 110 (to the left of the drying chamber 110 in FIG. 6), and a plurality of (six in the example of FIG. 6) bending conveyance rolls 125 (125A) having a roll diameter of 85 mm. ~ 125F). These bending conveyance rolls 125 (125A to 125F) are in contact with the undried first electrode layer 5x of the undried one-side negative electrode plate 1x and bend and convey the undried one-side negative electrode plate 1x in the thickness direction GH. Is. As shown in FIG. 6, the two bending conveyance rolls 125 are made into one set, and the conveyance direction of the undried one-side negative electrode plate 1x is changed by 180 degrees. The roll surfaces 125c (125Ac to 125Fc) of these bending conveyance rolls 125 (125A to 125F) are also covered with the polyimide layer.

また、第１乾燥装置１００は、乾燥室１１０の内部に、複数（図６の例では２１個）の加熱装置１３０を備える。これらの加熱装置１３０は、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに熱風を吹き付けるようにそれぞれ配置されている。   Further, the first drying device 100 includes a plurality of (21 in the example of FIG. 6) heating devices 130 inside the drying chamber 110. These heating devices 130 are respectively arranged so as to blow hot air onto the undried first electrode layer 5x of the undried one-side negative electrode plate 1x.

第１乾燥工程Ｓ２のうち、まず「１Ａ加熱乾燥工程Ｓ２１」（図３参照）において、未乾燥片側負極板１ｘを長手方向ＥＨに搬送しつつ、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘを加熱乾燥させる。具体的には、乾燥室１１０の外部から内部に搬入された未乾燥片側負極板１ｘを、未乾燥第１電極層５ｘを上方ＤＨ１に向けた状態で、水平方向ＣＨの一方側ＣＨ１（図６中、右方）に搬送する。そして、未乾燥片側負極板１ｘよりも上方ＤＨ１に配置された複数（図６の例では３個）の加熱装置１３０から、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに熱風をそれぞれ吹き付けて、未乾燥第１電極層５ｘを加熱乾燥させる。   In the first drying step S2, first, in “1A heating drying step S21” (see FIG. 3), the undried first electrode of the undried one-side negative plate 1x is conveyed while the undried one-side negative plate 1x is conveyed in the longitudinal direction EH. Layer 5x is heat dried. Specifically, the undried one-side negative electrode plate 1x carried into the interior from the outside of the drying chamber 110 is placed on the one side CH1 in the horizontal direction CH with the undried first electrode layer 5x facing upward DH1 (FIG. 6). (Middle, right) Then, hot air is respectively applied to the undried first electrode layer 5x of the undried one-side negative electrode plate 1x from a plurality of (three in the example of FIG. 6) heating devices 130 disposed above the undried one-side negative electrode plate 1x. The undried first electrode layer 5x is dried by heating.

続いて、未乾燥片側負極板１ｘのうち集電箔３の第２主面３ｂ（未乾燥第１電極層５ｘが形成されていない側）を折り返しロール１２３（１２３Ａ）に接触させて、未乾燥片側負極板１ｘをＵ字状に折り返して搬送する。即ち、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘを下方ＤＨ２に向けた状態で、水平方向ＣＨの他方側ＣＨ２（図６中、左方）に搬送する。そして、未乾燥片側負極板１ｘよりも下方ＤＨ２に配置された複数（図６の例では３個）の加熱装置１３０から、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに熱風をそれぞれ吹き付けて、未乾燥第１電極層５ｘを加熱乾燥させる。   Subsequently, the second main surface 3b (the side on which the undried first electrode layer 5x is not formed) of the current collector foil 3 in the undried one-side negative electrode plate 1x is brought into contact with the folding roll 123 (123A), and undried. The one-side negative electrode plate 1x is folded in a U shape and conveyed. That is, the undried first electrode layer 5x of the undried one-side negative electrode plate 1x is conveyed to the other side CH2 (left side in FIG. 6) in the horizontal direction CH with the DH2 facing downward DH2. Then, hot air is respectively applied to the undried first electrode layer 5x of the undried one-side negative electrode plate 1x from a plurality of (three in the example of FIG. 6) heating devices 130 disposed below the undried one-side negative electrode plate 1x. The undried first electrode layer 5x is dried by heating.

なお、折り返しロール１２３Ａで未乾燥片側負極板１ｘを折り返すにあたっては、前述のように、集電箔３の第２主面３ｂが折り返しロール１２３Ａに接触し、未乾燥第１電極層５ｘは折り返しロール１２３Ａに接触しないため、未乾燥第１電極層５ｘが折り返しロール１２３Ａに付着して未乾燥第１電極層５ｘが未乾燥片側負極板１ｘから剥がれる不具合は生じない。また、後述する１Ｃ再加熱乾燥工程Ｓ２３及び１Ｅ再加熱乾燥工程Ｓ２５において、折り返しロール１２３（１２３Ｂ，１２３Ｃ）で未乾燥片側負極板１ｘを折り返す際も同様に、未乾燥第１電極層５ｘが未乾燥片側負極板１ｘから剥がれる不具合は生じない。   When the undried one-side negative electrode plate 1x is folded by the folding roll 123A, as described above, the second main surface 3b of the current collector foil 3 is in contact with the folding roll 123A, and the undried first electrode layer 5x is the folding roll. Since there is no contact with 123A, there is no problem that the undried first electrode layer 5x adheres to the folding roll 123A and the undried first electrode layer 5x is peeled off from the undried one-side negative electrode plate 1x. Similarly, when the undried one-side negative electrode plate 1x is folded by the folding roll 123 (123B, 123C) in the 1C reheat drying step S23 and the 1E reheat drying step S25, which will be described later, the undried first electrode layer 5x is not yet removed. There is no problem of peeling off from the dry one-side negative electrode plate 1x.

次に、「１Ｂ冷却曲げ搬送工程Ｓ２２」を行う。まず、乾燥途中の未乾燥片側負極板１ｘを更に水平方向ＣＨの他方側ＣＨ２に搬送し、未乾燥片側負極板１ｘを搬出口１１１ｋ１を通じて乾燥室１１０の外部に一旦出して、後述する１Ｃ再加熱乾燥工程Ｓ２３等の雰囲気よりも低温（本実施形態では、２０℃）の外気に曝すことにより、未乾燥片側負極板１ｘ（未乾燥第１電極層５ｘ）を冷却する。これにより、本実施形態では、１４０℃であった未乾燥第１電極層５ｘの温度を、曲げ搬送ロール１２５（１２５Ａ）のロール表面１２５ｃ（１２５Ａｃ）に接触する直前で、温度Ｔ１＝８０℃まで下げる。そして、この温度Ｔ１＝８０℃に冷却された未乾燥第１電極層５ｘを、外気に曝された曲げ搬送ロール１２５（１２５Ａ）のロール表面１２５ｃ（１２５Ａｃ）に接触させて、未乾燥片側負極板１ｘを厚み方向ＧＨに９０度曲げて下方ＤＨ２に向けて搬送する。   Next, “1B cooling bending conveyance process S22” is performed. First, the undried one-side negative electrode plate 1x in the middle of drying is further transported to the other side CH2 in the horizontal direction CH, and the undried one-side negative electrode plate 1x is once taken out of the drying chamber 110 through the carry-out port 111k1, and 1C reheating described later The undried one-side negative electrode plate 1x (undried first electrode layer 5x) is cooled by exposure to the outside air at a temperature lower than the atmosphere of the drying step S23 and the like (20 ° C. in the present embodiment). Thereby, in this embodiment, the temperature of the undried first electrode layer 5x, which was 140 ° C., reaches the temperature T1 = 80 ° C. immediately before contacting the roll surface 125c (125Ac) of the bending conveyance roll 125 (125A). Lower. Then, the undried first electrode layer 5x cooled to this temperature T1 = 80 ° C. is brought into contact with the roll surface 125c (125Ac) of the bending conveyance roll 125 (125A) exposed to the outside air, and the undried one-side negative electrode plate 1x is bent 90 degrees in the thickness direction GH and conveyed toward the lower side DH2.

なお、本実施形態の第１乾燥装置１００においては、曲げ搬送ロール１２５Ａのロール表面１２５Ａｃに接触する直前の未乾燥第１電極層５ｘの温度が所望の温度Ｔ１＝８０℃となるように、乾燥室１１０の壁部１１１から曲げ搬送ロール１２５Ａまでの距離を定めてある。具体的には、壁部１１１の搬出口１１１ｋ１から曲げ搬送ロール１２５Ａまでの距離を長くするほど、未乾燥第１電極層５ｘが長時間冷却されるので、ロール表面１２５Ａｃに接触する際の未乾燥第１電極層５ｘの温度を低くできる。本実施形態では、ロール表面１２５Ａｃに接触する際の未乾燥第１電極層５ｘの温度が、８０℃以下（具体的には、Ｔ１＝８０℃）となるように、壁部１１１の搬出口１１１ｋから曲げ搬送ロール１２５Ａまでの距離を設定した。   In the first drying apparatus 100 of the present embodiment, the drying is performed so that the temperature of the undried first electrode layer 5x immediately before contacting the roll surface 125Ac of the bending conveyance roll 125A is a desired temperature T1 = 80 ° C. A distance from the wall portion 111 of the chamber 110 to the bending conveyance roll 125A is determined. Specifically, as the distance from the carry-out port 111k1 of the wall portion 111 to the bending conveyance roll 125A is increased, the undried first electrode layer 5x is cooled for a longer time, and thus the undried when contacting the roll surface 125Ac. The temperature of the first electrode layer 5x can be lowered. In this embodiment, the unloading 1st electrode layer 5x at the time of contacting roll surface 125Ac is 80 degreeC or less (specifically, T1 = 80 degreeC). To the bending conveyance roll 125A.

続いて、未乾燥第１電極層５ｘを外気に曝された曲げ搬送ロール１２５（１２５Ｂ）のロール表面１２５ｃ（１２５Ｂｃ）に接触させて、未乾燥片側負極板１ｘを厚み方向ＧＨに更に９０度曲げる。そして、未乾燥第１電極層５ｘを上方ＤＨ１に向けた状態で、未乾燥片側負極板１ｘを水平方向ＣＨの一方側ＣＨ１に向けて搬送し、乾燥室１１０の内部に戻す。   Subsequently, the undried first electrode layer 5x is brought into contact with the roll surface 125c (125Bc) of the bending conveyance roll 125 (125B) exposed to the outside air, and the undried one-side negative electrode plate 1x is further bent 90 degrees in the thickness direction GH. . Then, with the undried first electrode layer 5x facing upward DH1, the undried one-side negative electrode plate 1x is conveyed toward the one side CH1 in the horizontal direction CH and returned to the inside of the drying chamber 110.

なお、曲げ搬送ロール１２５Ａ，１２５Ｂで未乾燥片側負極板１ｘを曲げて搬送するにあたっては、前述のように、乾燥途中の未乾燥第１電極層５ｘが曲げ搬送ロール１２５Ａ，１２５Ｂのロール表面１２５Ａｃ，１２５Ｂｃに接触する。しかし、接触前に未乾燥第１電極層５ｘは、温度Ｔ１＝８０℃以下に冷却されて、含まれている結着剤１２，１６がやや硬くなるため、未乾燥第１電極層５ｘがロール表面１２５Ａｃ，１２５Ｂｃに付着して未乾燥第１電極層５ｘが未乾燥片側負極板１ｘから剥がれる不具合は生じない。また、後述する１Ｄ冷却曲げ搬送工程Ｓ２４及び１Ｆ冷却曲げ搬送工程Ｓ２６においても同様に、曲げ搬送ロール１２５（１２５Ｃ，１２５Ｄ，１２５Ｅ，１２５Ｆ）で未乾燥片側負極板１ｘを曲げて搬送する際も同様に、未乾燥第１電極層５ｘが未乾燥片側負極板１ｘから剥がれる不具合は生じない。   In addition, when the undried one-side negative electrode plate 1x is bent and conveyed by the bending conveyance rolls 125A and 125B, as described above, the undried first electrode layer 5x in the middle of drying is rolled onto the roll surfaces 125Ac and 125B of the bending conveyance rolls 125A and 125B. Contact 125Bc. However, before the contact, the undried first electrode layer 5x is cooled to a temperature T1 = 80 ° C. or lower, and the contained binders 12 and 16 become slightly hard. There is no problem that the undried first electrode layer 5x is attached to the surfaces 125Ac and 125Bc and peeled off from the undried one-side negative electrode plate 1x. Similarly, in the 1D cooling / bending / conveying step S24 and 1F cooling / bending / conveying step S26 to be described later, the same applies to the case where the undried one-side negative electrode plate 1x is bent and conveyed by the bending / conveying roll 125 (125C, 125D, 125E, 125F). In addition, there is no problem that the undried first electrode layer 5x is peeled off from the undried one-side negative electrode plate 1x.

次に、「１Ｃ再加熱乾燥工程Ｓ２３」において、冷却した未乾燥片側負極板１ｘの未乾燥第１電極層５ｘを再び加熱乾燥させる。具体的には、乾燥室１１０の内部に戻された未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに、未乾燥片側負極板１ｘよりも上方ＤＨ１に配置された複数（図６の例では３個）の加熱装置１３０から熱風をそれぞれ吹き付けて、未乾燥第１電極層５ｘを再び加熱乾燥させる。続いて、未乾燥片側負極板１ｘのうち集電箔３の第２主面３ｂ（未乾燥第１電極層５ｘが形成されていない側）を折り返しロール１２３（１２３Ｂ）に接触させて、未乾燥片側負極板１ｘをＵ字状に折り返して搬送する。更に、未乾燥片側負極板１ｘよりも下方ＤＨ２に配置された複数（図６の例では３個）の加熱装置１３０から、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに熱風をそれぞれ吹き付けて、未乾燥第１電極層５ｘを加熱乾燥させる。   Next, in the “1C reheating and drying step S23”, the undried first electrode layer 5x of the cooled undried one-side negative electrode plate 1x is dried again by heating. Specifically, a plurality of (examples in FIG. 6) are arranged on the undried first electrode layer 5x of the undried one-side negative electrode plate 1x returned to the inside of the drying chamber 110 and above DH1 above the undried one-side negative electrode plate 1x. Then, hot air is blown from the three heating devices 130, and the undried first electrode layer 5x is dried again by heating. Subsequently, the second main surface 3b (the side on which the undried first electrode layer 5x is not formed) of the current collector foil 3 in the undried one-side negative electrode plate 1x is brought into contact with the folding roll 123 (123B), and undried. The one-side negative electrode plate 1x is folded in a U shape and conveyed. Furthermore, hot air is respectively applied to the undried first electrode layer 5x of the undried one-side negative electrode plate 1x from a plurality of (three in the example of FIG. 6) heating devices 130 disposed below the undried one-side negative electrode plate 1x. The undried first electrode layer 5x is dried by heating.

次に、「１Ｄ冷却曲げ搬送工程Ｓ２４」を行う。１Ｂ冷却曲げ搬送工程Ｓ２２と同様に、乾燥途中の未乾燥片側負極板１ｘを搬出口１１１ｋ２を通じて乾燥室１１０の外部に一旦出して、２０℃の外気に曝すことにより、未乾燥片側負極板１ｘ（未乾燥第１電極層５ｘ）を温度Ｔ１＝８０℃に冷却する。そして、外気で温度Ｔ１＝８０℃に冷却された未乾燥第１電極層５ｘを曲げ搬送ロール１２５（１２５Ｃ）のロール表面１２５ｃ（１２５Ｃｃ）に接触させて、未乾燥片側負極板１ｘを厚み方向ＧＨに９０度曲げて搬送する。続いて、未乾燥第１電極層５ｘを曲げ搬送ロール１２５（１２５Ｄ）のロール表面１２５ｃ（１２５Ｄｃ）に接触させて、未乾燥片側負極板１ｘを厚み方向ＧＨに更に９０度曲げて搬送し、乾燥室１１０の内部に戻す。   Next, “1D cooling bending conveyance process S24” is performed. Similarly to the 1B cooling and bending conveyance step S22, the undried one-side negative electrode plate 1x (1x ( The undried first electrode layer 5x) is cooled to a temperature T1 = 80 ° C. Then, the undried first electrode layer 5x cooled to the temperature T1 = 80 ° C. with the outside air is brought into contact with the roll surface 125c (125Cc) of the bending conveyance roll 125 (125C), and the undried one-side negative electrode plate 1x is brought into the thickness direction GH. And then bend 90 degrees. Subsequently, the undried first electrode layer 5x is brought into contact with the roll surface 125c (125Dc) of the bending conveyance roll 125 (125D), and the undried one-side negative electrode plate 1x is further bent by 90 degrees in the thickness direction GH and conveyed. Return to the inside of the chamber 110.

次に、「１Ｅ再加熱乾燥工程Ｓ２５」において、冷却した未乾燥片側負極板１ｘの未乾燥第１電極層５ｘを再び加熱乾燥させる。１Ｃ再加熱乾燥工程Ｓ２３と同様に、未乾燥片側負極板１ｘよりも上方ＤＨ１に配置された複数（図６の例では３個）の加熱装置１３０から、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに熱風をそれぞれ吹き付けて、未乾燥第１電極層５ｘを再び加熱乾燥させる。続いて、未乾燥片側負極板１ｘのうち集電箔３の第２主面３ｂを折り返しロール１２３（１２３Ｃ）に接触させて、未乾燥片側負極板１ｘをＵ字状に折り返して搬送する。更に、未乾燥片側負極板１ｘよりも下方ＤＨ２に配置された複数（図６の例では３個）の加熱装置１３０から、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに熱風をそれぞれ吹き付けて、未乾燥第１電極層５ｘを加熱乾燥させる。   Next, in the “1E reheat drying step S25”, the undried first electrode layer 5x of the cooled undried one-side negative electrode plate 1x is dried again by heating. Similarly to the 1C reheat drying step S23, the undried first negative electrode plate 1x is undried from a plurality of (three in the example of FIG. 6) heating devices 130 disposed above the undried one negative electrode plate 1x. Hot air is blown to the 1 electrode layer 5x, respectively, and the undried first electrode layer 5x is dried again by heating. Subsequently, the second main surface 3b of the current collector foil 3 in the undried one-side negative electrode plate 1x is brought into contact with the folding roll 123 (123C), and the undried one-side negative electrode plate 1x is folded in a U shape and conveyed. Furthermore, hot air is respectively applied to the undried first electrode layer 5x of the undried one-side negative electrode plate 1x from a plurality of (three in the example of FIG. 6) heating devices 130 disposed below the undried one-side negative electrode plate 1x. The undried first electrode layer 5x is dried by heating.

次に、「１Ｆ冷却曲げ搬送工程Ｓ２６」を行う。１Ｂ冷却曲げ搬送工程Ｓ２２及び１Ｄ冷却曲げ搬送工程Ｓ２４と同様に、乾燥途中の未乾燥片側負極板１ｘを搬出口１１１ｋ３を通じて乾燥室１１０の外部に一旦出して、２０℃の外気に曝すことにより、未乾燥片側負極板１ｘ（未乾燥第１電極層５ｘ）を温度Ｔ１＝８０℃に冷却する。そして、外気で温度Ｔ１＝８０℃に冷却された未乾燥第１電極層５ｘを曲げ搬送ロール１２５（１２５Ｅ）のロール表面１２５ｃ（１２５Ｅｃ）に接触させて、未乾燥片側負極板１ｘを厚み方向ＧＨに９０度曲げて搬送する。続いて、未乾燥第１電極層５ｘを曲げ搬送ロール１２５（１２５Ｆ）のロール表面１２５ｃ（１２５Ｆｃ）に接触させて、未乾燥片側負極板１ｘを厚み方向ＧＨに更に９０度曲げて搬送し、乾燥室１１０の内部に戻す。   Next, “1F cooling bending conveyance process S26” is performed. Similarly to the 1B cooling bending conveyance step S22 and the 1D cooling bending conveyance step S24, the undried one-side negative electrode plate 1x in the middle of drying is once taken out of the drying chamber 110 through the carry-out port 111k3 and exposed to the outside air at 20 ° C. The undried one-side negative electrode plate 1x (undried first electrode layer 5x) is cooled to a temperature T1 = 80 ° C. Then, the undried first electrode layer 5x cooled to the temperature T1 = 80 ° C. with the outside air is brought into contact with the roll surface 125c (125Ec) of the bending conveyance roll 125 (125E), and the undried one-side negative electrode plate 1x is brought into the thickness direction GH. And then bend 90 degrees. Subsequently, the undried first electrode layer 5x is brought into contact with the roll surface 125c (125Fc) of the bending conveyance roll 125 (125F), and the undried one-side negative electrode plate 1x is further bent by 90 degrees in the thickness direction GH and conveyed. Return to the inside of the chamber 110.

次に、「１Ｇ再加熱乾燥工程Ｓ２７」において、冷却した未乾燥片側負極板１ｘの未乾燥第１電極層５ｘを再び加熱乾燥させる。具体的には、未乾燥片側負極板１ｘよりも上方ＤＨ１に配置された複数（図６の例では３個）の加熱装置１３０から、未乾燥片側負極板１ｘの未乾燥第１電極層５ｘに熱風をそれぞれ吹き付けて、未乾燥第１電極層５ｘを再び加熱乾燥させる。これにより、未乾燥第１電極層５ｘは完全に乾燥して第１電極層５が形成される。この集電箔３及び第１電極層５からなる片側負極板１ｚを、搬出口１１１ｋ４を通じて乾燥室１１０の外部に出して、第１乾燥工程Ｓ２を終了する。   Next, in the “1G reheat drying step S27”, the undried first electrode layer 5x of the cooled undried one-side negative electrode plate 1x is dried again by heating. Specifically, from a plurality of (three in the example of FIG. 6) heating devices 130 arranged DH1 above the undried one-side negative electrode plate 1x to the undried first electrode layer 5x of the undried one-side negative electrode plate 1x. Hot air is blown respectively to dry the undried first electrode layer 5x again. Thereby, the undried first electrode layer 5x is completely dried to form the first electrode layer 5. The one-side negative electrode plate 1z composed of the current collector foil 3 and the first electrode layer 5 is taken out of the drying chamber 110 through the carry-out port 111k4, and the first drying step S2 is completed.

次に、「未乾燥第２電極層形成工程Ｓ３」を行う。具体的には、図５に示した未乾燥電極層形成装置２００を用い、前述の未乾燥第１電極層形成工程Ｓ１と同様にして、集電箔３の第２主面３ｂ上に、長手方向ＥＨに帯状に未乾燥活物質層６ｃｘを形成する。更に、未乾燥活物質層６ｃｘの上に未乾燥セラミック層６ｄｘを形成する。これにより、集電箔３の第２主面３ｂ上に、未乾燥活物質層６ｃｘ及び未乾燥セラミック層６ｄｘからなる未乾燥第２電極層６ｘを有する未乾燥両側負極板（未乾燥電極板）１ｙが形成される。   Next, “undried second electrode layer forming step S3” is performed. Specifically, using the undried electrode layer forming apparatus 200 shown in FIG. 5, the longitudinal direction is formed on the second main surface 3 b of the current collector foil 3 in the same manner as the undried first electrode layer forming step S 1 described above. An undried active material layer 6cx is formed in a strip shape in the direction EH. Further, an undried ceramic layer 6dx is formed on the undried active material layer 6cx. Thereby, the undried both-sides negative electrode plate (undried electrode plate) which has the undried 2nd electrode layer 6x which consists of the undried active material layer 6cx and the undried ceramic layer 6dx on the 2nd main surface 3b of the current collection foil 3 1y is formed.

次に、「第２乾燥工程Ｓ４」（図２及び図４参照）において、図７に示す第２乾燥装置３００を用いて、未乾燥第２電極層６ｘを加熱乾燥させて第２電極層６を形成する。但し、第１乾燥装置１００では、折り返しロール１２３（１２３Ａ〜１２３Ｃ）は乾燥室１１０の内部にそれぞれ配置されていた。これに対し、この第２乾燥装置３００では、折り返しロール３２３（３２３Ａ〜３２３Ｃ）が乾燥室１１０の外部に（図７中、壁部３１１の右方に）それぞれ配置されている。   Next, in the “second drying step S4” (see FIGS. 2 and 4), the second electrode layer 6x is heated and dried to dry the second electrode layer 6x using the second drying apparatus 300 shown in FIG. Form. However, in the 1st drying apparatus 100, the folding | turning roll 123 (123A-123C) was arrange | positioned inside the drying chamber 110, respectively. On the other hand, in this 2nd drying apparatus 300, the folding | turning roll 323 (323A-323C) is each arrange | positioned outside the drying chamber 110 (in FIG. 7, the right side of the wall part 311).

まず「２Ａ加熱乾燥工程Ｓ４１」（図４参照）において、未乾燥両側負極板１ｙを長手方向ＥＨ（水平方向ＣＨの一方側ＣＨ１）に搬送しつつ、上方ＤＨ１に配置された加熱装置１３０により未乾燥両側負極板１ｙの未乾燥第２電極層６ｘを加熱乾燥させる。   First, in the “2A heat drying step S41” (see FIG. 4), the undried double-sided negative electrode plate 1y is transported in the longitudinal direction EH (one side CH1 of the horizontal direction CH) and unheated by the heating device 130 disposed in the upper DH1. The undried second electrode layer 6x of the dried both-side negative electrode plate 1y is dried by heating.

次に、「２Ｂ冷却曲げ搬送工程Ｓ４２」を行う。まず、未乾燥両側負極板１ｙを搬出口３１１ｋ５を通じて乾燥室１１０の外部に一旦出して、２０℃の外気に曝すことにより、未乾燥両側負極板１ｙ（第１電極層５）を温度Ｔ１＝８０℃に冷却する。そして、この温度Ｔ１＝８０℃に冷却された第１電極層５を、外気に曝された折り返しロール３２３（３２３Ａ）のロール表面３２３ｃ（３２３Ａｃ）に接触させて、未乾燥両側負極板１ｙをＵ字状に折り返して搬送する。   Next, “2B cooling bending conveyance process S42” is performed. First, the undried double-sided negative electrode plate 1y is once taken out of the drying chamber 110 through the carry-out port 311k5 and exposed to the outside air at 20 ° C., so that the undried double-sided negative electrode plate 1y (first electrode layer 5) has a temperature T1 = 80. Cool to ° C. Then, the first electrode layer 5 cooled to this temperature T1 = 80 ° C. is brought into contact with the roll surface 323c (323Ac) of the folded roll 323 (323A) exposed to the outside air, and the undried both-side negative electrode plate 1y is made U It is folded and transported in a letter shape.

このように、２Ｂ冷却曲げ搬送工程Ｓ４２では、第１電極層５が折り返しロール３２３Ａのロール表面３２３Ａｃに接触する。しかし、接触前に第１電極層５は、温度Ｔ１＝８０℃に冷却されて、含まれている結着剤１２，１６がやや硬くなるため、第１電極層５がロール表面３２３Ａｃに付着して第１電極層５が未乾燥両側負極板１ｙから剥がれるのを確実に防止できる。また、後述する２Ｆ冷却曲げ搬送工程Ｓ４６及び２Ｊ冷却曲げ搬送工程Ｓ５０においても同様に、折り返しロール３２３（３２３Ｂ，３２３Ｃ）で未乾燥両側負極板１ｙを折り返して搬送する際も同様に、第１電極層５が未乾燥両側負極板１ｙから剥がれるのを確実に防止できる。   Thus, in 2B cooling bending conveyance process S42, the 1st electrode layer 5 contacts roll surface 323Ac of the folding | turning roll 323A. However, before the contact, the first electrode layer 5 is cooled to a temperature T1 = 80 ° C., and the contained binders 12 and 16 become slightly hard, so that the first electrode layer 5 adheres to the roll surface 323Ac. Thus, the first electrode layer 5 can be reliably prevented from peeling off from the undried both-side negative electrode plate 1y. Similarly, in the 2F cooling bending conveyance step S46 and the 2J cooling bending conveyance step S50, which will be described later, when the undried double-sided negative electrode plate 1y is folded and conveyed by the folding roll 323 (323B, 323C), the first electrode is similarly applied. It is possible to reliably prevent the layer 5 from peeling from the undried both-side negative electrode plate 1y.

次に、「２Ｃ再加熱乾燥工程Ｓ４３」において、未乾燥両側負極板１ｙを水平方向ＣＨの他方側ＣＨ２に搬送しつつ、下方ＤＨ２に配置された加熱装置１３０により未乾燥両側負極板１ｙの未乾燥第２電極層６ｘを加熱乾燥させる。   Next, in the “2C reheating and drying step S43”, the undried double-sided negative electrode plate 1y is transferred to the other side CH2 in the horizontal direction CH while the undried double-sided negative electrode plate 1y is unloaded by the heating device 130 disposed in the lower DH2. The dried second electrode layer 6x is dried by heating.

次に、「２Ｄ冷却曲げ搬送工程Ｓ４４」を行う。前述の第１乾燥工程Ｓ２の１Ｂ冷却曲げ搬送工程Ｓ２２と同様に、未乾燥両側負極板１ｙを搬出口３１１ｋ１を通じて乾燥室１１０の外部に一旦出して、２０℃の外気に曝すことにより、未乾燥両側負極板１ｙ（未乾燥第２電極層６ｘ）を温度Ｔ１＝８０℃に冷却する。そして、この温度Ｔ１＝８０℃に冷却された未乾燥第２電極層６ｘを、外気に曝された曲げ搬送ロール１２５（１２５Ａ）のロール表面１２５ｃ（１２５Ａｃ）に接触させて、未乾燥両側負極板１ｙを厚み方向ＧＨに９０度曲げて搬送する。続いて、未乾燥第２電極層６ｘを曲げ搬送ロール１２５（１２５Ｂ）のロール表面１２５ｃ（１２５Ｂｃ）に接触させて、未乾燥両側負極板１ｙを厚み方向ＧＨに更に９０度曲げて搬送し、乾燥室１１０の内部に戻す。   Next, “2D cooling bending conveyance process S44” is performed. Similar to the 1B cooling bending conveyance step S22 of the first drying step S2, the undried both-side negative electrode plate 1y is once taken out of the drying chamber 110 through the carry-out port 311k1 and exposed to the outside air at 20 ° C. Both-side negative electrode plate 1y (undried second electrode layer 6x) is cooled to a temperature T1 = 80 ° C. Then, the undried second electrode layer 6x cooled to this temperature T1 = 80 ° C. is brought into contact with the roll surface 125c (125Ac) of the bending conveyance roll 125 (125A) exposed to the outside air, and both undried negative electrode plates 1y is bent 90 degrees in the thickness direction GH and conveyed. Subsequently, the undried second electrode layer 6x is brought into contact with the roll surface 125c (125Bc) of the bending conveyance roll 125 (125B), and the undried negative electrode plate 1y is further bent by 90 degrees in the thickness direction GH and conveyed. Return to the inside of the chamber 110.

なお、曲げ搬送ロール１２５Ａ，１２５Ｂで未乾燥両側負極板１ｙを曲げて搬送するにあたっては、乾燥途中の未乾燥第２電極層６ｘが曲げ搬送ロール１２５Ａ，１２５Ｂのロール表面１２５Ａｃ，１２５Ｂｃに接触する。しかし、接触前に未乾燥第２電極層６ｘは、温度Ｔ１＝８０℃以下に冷却されて、含まれている結着剤１２，１６がやや硬くなるため、未乾燥第２電極層６ｘがロール表面１２５Ａｃ，１２５Ｂｃに付着して未乾燥第２電極層６ｘが未乾燥両側負極板１ｙから剥がれる不具合は生じない。また、後述する２Ｆ冷却曲げ搬送工程Ｓ４６及び２Ｌ冷却曲げ搬送工程Ｓ５２においても同様に、曲げ搬送ロール１２５（１２５Ｃ，１２５Ｄ，１２５Ｅ，１２５Ｆ）で未乾燥両側負極板１ｙを曲げて搬送する際も同様に、未乾燥第２電極層６ｘが未乾燥両側負極板１ｙから剥がれる不具合は生じない。   When the undried both-side negative electrode plate 1y is bent and conveyed by the bending conveyance rolls 125A and 125B, the undried second electrode layer 6x in the middle of drying contacts the roll surfaces 125Ac and 125Bc of the bending conveyance rolls 125A and 125B. However, before the contact, the undried second electrode layer 6x is cooled to a temperature T1 = 80 ° C. or lower, and the contained binders 12 and 16 become slightly hard. There is no problem that the undried second electrode layer 6x is attached to the surfaces 125Ac and 125Bc and peeled off from the undried both-side negative electrode plate 1y. Similarly, in the 2F cooling bending conveyance step S46 and the 2L cooling bending conveyance step S52, which will be described later, the same applies to the case where the undried both-side negative electrode plate 1y is bent and conveyed by the bending conveyance roll 125 (125C, 125D, 125E, 125F). Further, there is no problem that the undried second electrode layer 6x is peeled off from the undried both-side negative electrode plate 1y.

次に、「２Ｅ再加熱乾燥工程Ｓ４５」において、未乾燥両側負極板１ｙを水平方向ＣＨの一方側ＣＨ１に搬送しつつ、上方ＤＨ１に配置された加熱装置１３０により未乾燥両側負極板１ｙの未乾燥第２電極層６ｘを加熱乾燥させる。   Next, in the “2E reheating and drying step S45”, the undried double-sided negative electrode plate 1y is transferred to the one side CH1 in the horizontal direction CH while the undried double-sided negative electrode plate 1y is unloaded by the heating device 130 disposed in the upper DH1. The dried second electrode layer 6x is dried by heating.

次に、「２Ｆ冷却曲げ搬送工程Ｓ４６」を行う。まず、未乾燥両側負極板１ｙを搬出口３１１ｋ６を通じて乾燥室１１０の外部に一旦出して、２０℃の外気に曝すことにより、未乾燥両側負極板１ｙ（第１電極層５）を温度Ｔ１＝８０℃に冷却する。そして、この温度Ｔ１＝８０℃に冷却された第１電極層５を折り返しロール３２３（３２３Ｂ）のロール表面３２３ｃ（３２３Ｂｃ）に接触させて、未乾燥両側負極板１ｙをＵ字状に折り返して搬送する。   Next, “2F cooling bending conveyance process S46” is performed. First, the undried double-sided negative electrode plate 1y is once taken out of the drying chamber 110 through the carry-out port 311k6 and exposed to the outside air at 20 ° C., so that the undried double-sided negative electrode plate 1y (first electrode layer 5) has a temperature T1 = 80. Cool to ° C. Then, the first electrode layer 5 cooled to the temperature T1 = 80 ° C. is brought into contact with the roll surface 323c (323Bc) of the folding roll 323 (323B), and the undried both-side negative electrode plate 1y is folded and conveyed in a U shape. To do.

次に、「２Ｇ再加熱乾燥工程Ｓ４７」において、未乾燥両側負極板１ｙを水平方向ＣＨの他方側ＣＨ２に搬送しつつ、下方ＤＨ２に配置された加熱装置１３０により未乾燥両側負極板１ｙの未乾燥第２電極層６ｘを加熱乾燥させる。   Next, in the “2G reheating and drying step S47”, the undried double-sided negative electrode plate 1y is transferred to the other side CH2 in the horizontal direction CH while the undried double-sided negative electrode plate 1y is unloaded by the heating device 130 disposed in the lower DH2. The dried second electrode layer 6x is dried by heating.

次に、「２Ｈ冷却曲げ搬送工程Ｓ４８」において、前述の第１乾燥工程Ｓ２の１Ｄ冷却曲げ搬送工程Ｓ２４と同様に、未乾燥両側負極板１ｙを搬出口３１１ｋ２を通じて乾燥室１１０の外部に一旦出して未乾燥第２電極層６ｘを２０℃の外気で温度Ｔ１＝８０℃以下に冷却した上で、ロール表面１２５ｃ（１２５Ｃｃ，１２５Ｄｃ）に接触させ、未乾燥両側負極板１ｙを曲げ搬送ロール１２５（１２５Ｃ，１２５Ｄ）で曲げて搬送する。   Next, in the “2H cooling / bending / conveying step S48”, as in the 1D cooling / bending / conveying step S24 of the first drying step S2, the undried both-side negative electrode plate 1y is once taken out of the drying chamber 110 through the carry-out port 311k2. After the undried second electrode layer 6x is cooled to a temperature T1 = 80 ° C. or lower with the outside air of 20 ° C., it is brought into contact with the roll surface 125c (125Cc, 125Dc), and the undried both-side negative electrode plate 1y is bent and conveyed by the roll 125 ( 125C, 125D) to bend and convey.

次に、「２Ｉ再加熱乾燥工程Ｓ４９」において、未乾燥両側負極板１ｙを水平方向ＣＨの一方側ＣＨ１に搬送しつつ、上方ＤＨ１に配置された加熱装置１３０により未乾燥両側負極板１ｙの未乾燥第２電極層６ｘを加熱乾燥させる。   Next, in the “2I reheating and drying step S49”, the undried double-sided negative electrode plate 1y is transferred to the one side CH1 in the horizontal direction CH while the undried double-sided negative electrode plate 1y is unloaded by the heating device 130 disposed in the upper DH1. The dried second electrode layer 6x is dried by heating.

次に、「２Ｊ冷却曲げ搬送工程Ｓ５０」を行う。まず、未乾燥両側負極板１ｙを搬出口３１１ｋ７を通じて乾燥室１１０の外部に一旦出して、２０℃の外気に曝すことにより、未乾燥両側負極板１ｙ（第１電極層５）を温度Ｔ１＝８０℃に冷却する。そして、この温度Ｔ１＝８０℃に冷却された第１電極層５を折り返しロール３２３（３２３Ｃ）のロール表面３２３ｃ（３２３Ｃｃ）に接触させて、未乾燥両側負極板１ｙをＵ字状に折り返して搬送する。   Next, “2J cooling bending conveyance process S50” is performed. First, the undried double-sided negative electrode plate 1y is once taken out of the drying chamber 110 through the carry-out port 311k7 and exposed to the outside air at 20 ° C., so that the undried double-sided negative electrode plate 1y (first electrode layer 5) has a temperature T1 = 80. Cool to ° C. Then, the first electrode layer 5 cooled to the temperature T1 = 80 ° C. is brought into contact with the roll surface 323c (323Cc) of the folding roll 323 (323C), and the undried both-side negative electrode plate 1y is folded and conveyed in a U shape. To do.

次に、「２Ｋ再加熱乾燥工程Ｓ５１」において、未乾燥両側負極板１ｙを水平方向ＣＨの他方側ＣＨ２に搬送しつつ、下方ＤＨ２に配置された加熱装置１３０により未乾燥両側負極板１ｙの未乾燥第２電極層６ｘを加熱乾燥させる。   Next, in the “2K reheating and drying step S51”, the undried double-sided negative electrode plate 1y is transferred to the other side CH2 in the horizontal direction CH while the undried double-sided negative electrode plate 1y is unloaded by the heating device 130 disposed in the lower DH2. The dried second electrode layer 6x is dried by heating.

次に、「２Ｌ冷却曲げ搬送工程Ｓ５２」において、前述の第１乾燥工程Ｓ２の１Ｆ冷却曲げ搬送工程Ｓ２６と同様に、未乾燥両側負極板１ｙを搬出口３１１ｋ３を通じて乾燥室１１０の外部に一旦出して未乾燥第２電極層６ｘを２０℃の外気で温度Ｔ１＝８０℃以下に冷却した上で、ロール表面１２５ｃ（１２５Ｅｃ，１２５Ｆｃ）に接触させ、未乾燥両側負極板１ｙを曲げ搬送ロール１２５（１２５Ｅ，１２５Ｆ）で曲げて搬送する。   Next, in the “2L cooling / bending / conveying step S52”, similarly to the 1F cooling / bending / conveying step S26 of the first drying step S2, the undried both-side negative electrode plates 1y are once taken out of the drying chamber 110 through the carry-out port 311k3. After the undried second electrode layer 6x is cooled to a temperature T1 = 80 ° C. or lower with the outside air of 20 ° C., it is brought into contact with the roll surface 125c (125Ec, 125Fc), and the undried both-side negative electrode plate 1y is bent and conveyed to the roll 125 ( 125E, 125F) and then transported.

次に、「２Ｍ再加熱乾燥工程Ｓ５３」において、前述の第１乾燥工程Ｓ２の１Ｇ再加熱乾燥工程Ｓ２７と同様に、冷却した未乾燥両側負極板１ｙの未乾燥第２電極層６ｘを再び加熱乾燥させる。これにより、未乾燥第２電極層６ｘは完全に乾燥して第２電極層６が形成される。この集電箔３、第１電極層５及び第２電極層６からなる負極板１を、搬出口３１１ｋ８を通じて乾燥室１１０の外部に出して、第２乾燥工程Ｓ４を終了する。かくして、負極板１が完成する。   Next, in the “2M reheat drying step S53”, similarly to the 1G reheat drying step S27 of the first drying step S2, the undried second electrode layer 6x of the cooled undried negative electrode plate 1y is heated again. dry. Thereby, the undried second electrode layer 6x is completely dried to form the second electrode layer 6. The negative electrode plate 1 composed of the current collector foil 3, the first electrode layer 5, and the second electrode layer 6 is taken out of the drying chamber 110 through the carry-out port 311k8, and the second drying step S4 is completed. Thus, the negative electrode plate 1 is completed.

（実施例及び比較例）
次いで、本発明の効果を検証するために行った試験の結果について説明する。実施例として、実施形態の製造方法により負極板１を製造した。前述のように、実施形態に係る負極板１の製造方法では、乾燥途中の未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを温度Ｔ１＝８０℃以下に冷却した上で、曲げ搬送ロール１２５に接触させている（表１も参照）。 (Examples and Comparative Examples)
Subsequently, the result of the test conducted in order to verify the effect of this invention is demonstrated. As an example, the negative electrode plate 1 was manufactured by the manufacturing method of the embodiment. As described above, in the method of manufacturing the negative electrode plate 1 according to the embodiment, the undried first electrode layer 5x and the undried second electrode layer 6x that are being dried are cooled to a temperature T1 = 80 ° C. or less, and then bent and conveyed. It is in contact with the roll 125 (see also Table 1).

Figure 2019036453
Figure 2019036453

一方、比較例として、前述の第１乾燥装置１００（図６参照）及び第２乾燥装置３００（図７参照）の代わりに、図８に示す乾燥装置４００を用いて、第１乾燥工程Ｓ２及び第２乾燥工程Ｓ４を行い、乾燥途中の未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを冷却することなく、曲げ搬送ロール４２５に接触させて、負極板１を製造した。なお、この乾燥装置４００では、曲げ搬送ロール４２５（４２５Ａ〜４２５Ｆ）及び折り返しロール１２３（１２３Ａ〜１２３Ｃ）が乾燥室４１０の内部にそれぞれ配置されている。このため、乾燥途中の未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘは、２０℃の外気に曝されて冷却されることはなく、曲げ搬送ロール４２５に接触する。   On the other hand, as a comparative example, instead of the first drying device 100 (see FIG. 6) and the second drying device 300 (see FIG. 7), a drying device 400 shown in FIG. The 2nd drying process S4 was performed and the negative electrode plate 1 was manufactured by making it contact with the bending conveyance roll 425, without cooling the undried 1st electrode layer 5x and the undried 2nd electrode layer 6x in the middle of drying. In the drying apparatus 400, the bending conveyance roll 425 (425A to 425F) and the folding roll 123 (123A to 123C) are respectively disposed inside the drying chamber 410. For this reason, the undried first electrode layer 5x and the undried second electrode layer 6x in the middle of drying are not exposed to the outside air at 20 ° C. and are not cooled, but contact the bending conveyance roll 425.

実施例及び比較例の負極板１の製造において、未乾燥第１電極層５ｘ（または未乾燥第２電極層６ｘ）が、いずれかの曲げ搬送ロール１２５，４２５のロール表面１２５ｃ，４２５ｃに付着して、未乾燥第１電極層５ｘ（または未乾燥第２電極層６ｘ）が未乾燥片側負極板１ｘ（または未乾燥両側負極板１ｙ）から剥がれる不具合は生じたか否かをそれぞれ調査した。その結果を表１に示す。   In the manufacture of the negative electrode plate 1 of the example and the comparative example, the undried first electrode layer 5x (or the undried second electrode layer 6x) adheres to the roll surfaces 125c and 425c of one of the bending conveyance rolls 125 and 425. Then, whether or not a problem that the undried first electrode layer 5x (or undried second electrode layer 6x) peeled off from the undried one-side negative electrode plate 1x (or undried both-side negative electrode plate 1y) occurred was investigated. The results are shown in Table 1.

表１から明らかなように、乾燥途中の未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを冷却することなく、曲げ搬送ロール４２５に接触させた比較例では、未乾燥第１電極層５ｘまたは未乾燥第２電極層６ｘが未乾燥片側負極板１ｘまたは未乾燥両側負極板１ｙから剥がれる不具合が生じた。これに対し、乾燥途中の未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを温度Ｔ１＝８０℃以下に冷却した上で、曲げ搬送ロール１２５に接触させた実施例では、未乾燥第１電極層５ｘまたは未乾燥第２電極層６ｘが未乾燥片側負極板１ｘまたは未乾燥両側負極板１ｙから剥がれる不具合は生じなかった。このことから、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを温度Ｔ１＝８０℃以下に冷却した上で、曲げ搬送ロール１２５に接触させることにより、未乾燥第１電極層５ｘまたは未乾燥第２電極層６ｘが剥がれる不具合を防止できたことが判る。   As is clear from Table 1, in the comparative example in which the undried first electrode layer 5x and the undried second electrode layer 6x being dried were brought into contact with the bending conveyance roll 425 without cooling, the undried first electrode layer There was a problem that 5x or the undried second electrode layer 6x peeled off from the undried one-side negative electrode plate 1x or the undried both-side negative electrode plate 1y. On the other hand, in the embodiment in which the undried first electrode layer 5x and the undried second electrode layer 6x in the middle of drying are cooled to a temperature T1 = 80 ° C. or lower and then brought into contact with the bending conveyance roll 125, There was no problem that the one electrode layer 5x or the undried second electrode layer 6x peeled off from the undried one-side negative electrode plate 1x or the undried both-side negative electrode plate 1y. From this, the undried first electrode layer 5x and the undried second electrode layer 6x are cooled to a temperature T1 = 80 ° C. or lower and then brought into contact with the bending conveyance roll 125, whereby the undried first electrode layer 5x or It turns out that the malfunction which the undried 2nd electrode layer 6x peeled was able to be prevented.

これに対し、比較例では、加熱乾燥によって未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘの温度がこれらに含まれる結着剤１２，１６の軟化点よりも高くなって、結着剤１２，１６が軟化し、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘがロール表面４２５ｃに付着し易くなったため、未乾燥第１電極層５ｘまたは未乾燥第２電極層６ｘが未乾燥片側負極板１ｘから剥がれたと考えられる。一方、実施例では、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを結着剤１２，１６の軟化点よりも低い温度に冷却した上でロール表面１２５ｃに接触させたことにより、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘのロール表面１２５ｃへの付着性を下げることができた。このため、未乾燥第１電極層５ｘまたは未乾燥第２電極層６ｘがロール表面１２５ｃに付着して未乾燥片側電極板１ｘから剥がれる不具合を防止できたと考えられる。   On the other hand, in the comparative example, the temperature of the undried first electrode layer 5x and the undried second electrode layer 6x becomes higher than the softening point of the binders 12 and 16 contained therein by heat drying, and the binding is performed. Since the agents 12 and 16 are softened and the undried first electrode layer 5x and the undried second electrode layer 6x are easily attached to the roll surface 425c, the undried first electrode layer 5x or the undried second electrode layer 6x is It is thought that it peeled off from the undried one-side negative electrode plate 1x. On the other hand, in the example, the undried first electrode layer 5x and the undried second electrode layer 6x were cooled to a temperature lower than the softening point of the binders 12 and 16, and then brought into contact with the roll surface 125c. The adhesion of the undried first electrode layer 5x and the undried second electrode layer 6x to the roll surface 125c could be lowered. For this reason, it is considered that the problem that the undried first electrode layer 5x or the undried second electrode layer 6x adhered to the roll surface 125c and peeled off from the undried one-side electrode plate 1x could be prevented.

以上で説明したように、実施形態の負極板１の製造方法では、第１乾燥工程Ｓ２の１Ｂ冷却曲げ搬送工程Ｓ２２，１Ｄ冷却曲げ搬送工程Ｓ２４及び１Ｆ冷却曲げ搬送工程Ｓ２６において、乾燥途中の未乾燥第１電極層５ｘを曲げ搬送ロール１２５のロール表面１２５ｃに接触させて未乾燥片側負極板１ｘを曲げて搬送するにあたり、未乾燥第１電極層５ｘを予め定めた温度Ｔ１＝８０℃以下に冷却した上で、未乾燥第１電極層５ｘを曲げ搬送ロール１２５のロール表面１２５ｃに接触させている。このようにすると、未乾燥第１電極層５ｘに含まれる結着剤１２，１６が軟化していない状態で未乾燥第１電極層５ｘをロール表面１２５ｃに接触させることができ、未乾燥第１電極層５ｘのロール表面１２５ｃへの付着性を下げることができるので、未乾燥第１電極層５ｘがロール表面１２５ｃに付着して未乾燥片側負極板１ｘから剥がれる不具合を抑制できる。   As described above, in the manufacturing method of the negative electrode plate 1 of the embodiment, in the 1B cooling bending conveyance step S22, the 1D cooling bending conveyance step S24 and the 1F cooling bending conveyance step S26 of the first drying step S2, the drying is not performed. When the dried first electrode layer 5x is brought into contact with the roll surface 125c of the bending conveyance roll 125 and the undried one-side negative electrode plate 1x is bent and conveyed, the undried first electrode layer 5x is set to a predetermined temperature T1 = 80 ° C. or lower. After cooling, the undried first electrode layer 5x is brought into contact with the roll surface 125c of the bending conveyance roll 125. In this way, the undried first electrode layer 5x can be brought into contact with the roll surface 125c in a state where the binders 12 and 16 contained in the undried first electrode layer 5x are not softened. Since the adhesion of the electrode layer 5x to the roll surface 125c can be lowered, it is possible to suppress the problem that the undried first electrode layer 5x adheres to the roll surface 125c and peels off from the undried one-side negative electrode plate 1x.

同様に、第２乾燥工程Ｓ４の２Ｄ冷却曲げ搬送工程Ｓ４４，２Ｈ冷却曲げ搬送工程Ｓ４８及び２Ｌ冷却曲げ搬送工程Ｓ５２において、乾燥途中の未乾燥第２電極層６ｘを曲げ搬送ロール１２５のロール表面１２５ｃに接触させて未乾燥両側負極板１ｙを曲げて搬送するにあたり、未乾燥第２電極層６ｘを予め定めた温度Ｔ１＝８０℃以下に冷却した上で、未乾燥第２電極層６ｘを曲げ搬送ロール１２５のロール表面１２５ｃに接触させている。このようにすると、未乾燥第２電極層６ｘに含まれる結着剤１２，１６が軟化していない状態で未乾燥第２電極層６ｘをロール表面１２５ｃに接触させることができ、未乾燥第２電極層６ｘのロール表面１２５ｃへの付着性を下げることができるので、未乾燥第２電極層６ｘがロール表面１２５ｃに付着して未乾燥両側負極板１ｙから剥がれる不具合を抑制できる。   Similarly, in 2D cooling bending conveyance process S44 of 2nd drying process S4, 2H cooling bending conveyance process S48, and 2L cooling bending conveyance process S52, the undried 2nd electrode layer 6x in the middle of drying is roll surface 125c of bending conveyance roll 125 When the undried double-sided negative electrode plate 1y is bent and conveyed, the undried second electrode layer 6x is cooled to a predetermined temperature T1 = 80 ° C. or lower, and the undried second electrode layer 6x is bent and conveyed. The roll 125 is brought into contact with the roll surface 125c. In this way, the undried second electrode layer 6x can be brought into contact with the roll surface 125c in a state where the binders 12 and 16 included in the undried second electrode layer 6x are not softened, and the second undried second electrode layer 6x is brought into contact with the roll surface 125c. Since the adhesion of the electrode layer 6x to the roll surface 125c can be lowered, it is possible to suppress the problem that the undried second electrode layer 6x adheres to the roll surface 125c and peels from the undried both-side negative electrode plate 1y.

更に、第２乾燥工程Ｓ４の２Ｂ冷却曲げ搬送工程Ｓ４２，２Ｆ冷却曲げ搬送工程Ｓ４６及び２Ｊ冷却曲げ搬送工程Ｓ５０において、第１電極層５を折り返し３２３のロール表面３２３ｃに接触させて未乾燥両側負極板１ｙを折り返して搬送するにあたり、第１電極層５を予め定めた温度Ｔ１＝８０℃以下に冷却した上で、第１電極層５を折り返し３２３のロール表面３２３ｃに接触させている。このようにすると、第１電極層５に含まれる結着剤１２，１６が軟化していない状態で第１電極層５をロール表面３２３ｃに接触させることができ、第１電極層５のロール表面３２３ｃへの付着性を下げることができるので、第１電極層５がロール表面３２３ｃに付着して未乾燥両側負極板１ｙから剥がれることも確実に防止できる。   Furthermore, in 2B cooling bending conveyance process S42 of 2nd drying process S4, 2F cooling bending conveyance process S46, and 2J cooling bending conveyance process S50, the 1st electrode layer 5 is made to contact the roll surface 323c of the folding | returning 323, and an undried both-sides negative electrode In folding and transporting the plate 1 y, the first electrode layer 5 is cooled to a predetermined temperature T 1 = 80 ° C. or lower and the first electrode layer 5 is brought into contact with the roll surface 323 c of the folded 323. If it does in this way, the 1st electrode layer 5 can be made to contact roll surface 323c in the state where binders 12 and 16 contained in the 1st electrode layer 5 are not softened, and the roll surface of the 1st electrode layer 5 Since adhesion to 323c can be lowered, it is possible to reliably prevent the first electrode layer 5 from adhering to the roll surface 323c and peeling off from the undried both-side negative electrode plate 1y.

また、実施形態の負極板１の製造方法では、曲げ搬送ロール１２５のロール表面１２５ｃがポリイミドからなる。これにより、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘのロール表面１２５ｃからの離型性が良くなるため、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘがロール表面１２５ｃに付着して未乾燥片側負極板１ｘまたは未乾燥両側負極板１ｙから剥がれる不具合をより効果的に抑制できる。   Moreover, in the manufacturing method of the negative electrode plate 1 of embodiment, the roll surface 125c of the bending conveyance roll 125 consists of polyimides. Thereby, since the releasability from the roll surface 125c of the undried first electrode layer 5x and the undried second electrode layer 6x is improved, the undried first electrode layer 5x and the undried second electrode layer 6x are The trouble which adheres to 125c and peels from undried one-sided negative electrode plate 1x or undried both-sided negative electrode plate 1y can be controlled more effectively.

また、実施形態では、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを、１Ｃ再加熱乾燥工程Ｓ２３等の雰囲気よりも低温の外気に曝して冷却しているので、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘを冷却するための冷却装置などを要しない。また、曲げ搬送ロール１２５を１Ｃ再加熱乾燥工程Ｓ２３等の雰囲気よりも低温の外気に曝しているので、ロール表面１２５ｃの温度が低く、未乾燥第１電極層５ｘ及び未乾燥第２電極層６ｘがロール表面１２５ｃに付着して未乾燥片側負極板１ｘまたは未乾燥両側負極板１ｙから剥がれる不具合をより効果的に抑制できる。   Further, in the embodiment, the undried first electrode layer 5x and the undried second electrode layer 6x are cooled by being exposed to outside air having a temperature lower than that of the atmosphere such as the 1C reheating drying step S23. A cooling device or the like for cooling the electrode layer 5x and the undried second electrode layer 6x is not required. Moreover, since the bending conveyance roll 125 is exposed to the outside air having a temperature lower than that of the atmosphere such as the 1C reheat drying step S23, the temperature of the roll surface 125c is low, and the undried first electrode layer 5x and the undried second electrode layer 6x. Can adhere to the roll surface 125c and peel off from the undried one-side negative electrode plate 1x or the undried both-side negative electrode plate 1y more effectively.

以上において、本発明を実施形態に即して説明したが、本発明は上述の実施形態に限定されるものではなく、その要旨を逸脱しない範囲で、適宜変更して適用できることは言うまでもない。
例えば、実施形態では、電極板の製造方法として、負極板１の製造方法を例示したが、正極板の製造方法に本発明を適用することもできる。 In the above, the present invention has been described with reference to the embodiment. However, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be appropriately modified and applied without departing from the gist thereof.
For example, in the embodiment, the manufacturing method of the negative electrode plate 1 is exemplified as the manufacturing method of the electrode plate, but the present invention can also be applied to the manufacturing method of the positive electrode plate.

また、実施形態では、負極活物質粒子１１、結着剤１２及び溶媒１３を含む造粒した湿潤粒子２２からなる粒子集合体２１を用いて、集電箔３上に未乾燥活物質層５ｃｘ，６ｃｘを形成したが、これに限られない。例えば、負極活物質粒子１１及び結着剤１２を溶媒１３と共に混練して作製した活物質ペーストを用意し、この活物質ペーストをダイコータ等により集電箔３上に塗布することにより、集電箔３上に未乾燥活物質層５ｃｘ，６ｃｘを形成することもできる。   Further, in the embodiment, the undried active material layer 5cx, on the current collector foil 3 using the particle aggregate 21 composed of the granulated wet particles 22 including the negative electrode active material particles 11, the binder 12, and the solvent 13. Although 6cx was formed, it is not restricted to this. For example, an active material paste prepared by kneading the negative electrode active material particles 11 and the binder 12 together with the solvent 13 is prepared, and the active material paste is applied onto the current collector foil 3 by a die coater or the like, thereby collecting the current collector foil. The undried active material layers 5 cx and 6 cx can be formed on the substrate 3.

また、実施形態では、電極板として、帯状の集電箔３の第１主面３ａと第２主面３ｂの両面に、それぞれ電極層（第１電極層５及び第２電極層６）を有する電極板１を例示したが、電極板の形態はこれに限られない。例えば、帯状の集電箔３の第１主面３ａのみに電極層（第１電極層５）を有し、第２主面３ｂには電極層を有しない形態の電極板の製造に、本発明を適用することもできる。この場合、未乾燥第１電極層形成工程Ｓ１及び第１乾燥工程Ｓ２を行うことによって（未乾燥第２電極層形成工程Ｓ３及び第２乾燥工程Ｓ４は行わずに）電極板を製造できる。   Moreover, in embodiment, it has an electrode layer (the 1st electrode layer 5 and the 2nd electrode layer 6) on both surfaces of the 1st main surface 3a of the strip | belt-shaped collector foil 3, and the 2nd main surface 3b as an electrode plate, respectively. Although the electrode plate 1 was illustrated, the form of the electrode plate is not limited to this. For example, for manufacturing an electrode plate having an electrode layer (first electrode layer 5) only on the first main surface 3a of the strip-shaped current collector foil 3 and no electrode layer on the second main surface 3b. The invention can also be applied. In this case, an electrode plate can be manufactured by performing the undried first electrode layer forming step S1 and the first drying step S2 (without performing the undried second electrode layer forming step S3 and the second drying step S4).

また、実施形態では、未乾燥第１電極層５ｘを乾燥させて第１電極層５を形成する際にも（第１乾燥工程Ｓ２）、未乾燥第２電極層６ｘを乾燥させて第２電極層６を形成する際にも（第２乾燥工程Ｓ４）、本発明を適用したが、いずれか一方の乾燥工程にのみ、本発明を適用して、電極板１を製造することもできる。   In the embodiment, when the undried first electrode layer 5x is dried to form the first electrode layer 5 (first drying step S2), the undried second electrode layer 6x is dried to obtain the second electrode. Although the present invention is applied to the formation of the layer 6 (second drying step S4), the electrode plate 1 can be manufactured by applying the present invention only to any one of the drying steps.

１ 負極板（電極板）
１ｘ 未乾燥片側負極板（未乾燥電極板）
１ｙ 未乾燥両側負極板（未乾燥電極板）
１ｚ 片側負極板
３ 集電箔
５ 第１電極層
５ｘ 未乾燥第１電極層
６ 第２電極層
６ｘ 未乾燥第２電極層
１１ 負極活物質（活物質）粒子
１２ 結着剤
１３ 溶媒
１６ 結着剤
１７ 溶媒
１００ 第１乾燥装置
３００ 第２乾燥装置
１１０，３１０，４１０ 乾燥室
１２５（１２５Ａ〜１２５Ｆ） 曲げ搬送ロール
１２５ｃ（１２５Ａｃ〜１２５Ｆｃ） （曲げ搬送ロールの）ロール表面
４２５ 曲げ搬送ロール
１３０ 加熱装置
ＥＨ 長手方向
Ｔ１ （予め定めた）温度
Ｓ１ 未乾燥第１電極層形成工程
Ｓ２ 第１乾燥工程
Ｓ２１ １Ａ加熱乾燥工程
Ｓ２２ １Ｂ冷却曲げ搬送工程
Ｓ２３ １Ｃ再加熱乾燥工程
Ｓ２４ １Ｄ冷却曲げ搬送工程
Ｓ２５ １Ｅ再加熱乾燥工程
Ｓ２６ １Ｆ冷却曲げ搬送工程
Ｓ２７ １Ｇ再加熱乾燥工程
Ｓ３ 未乾燥第２電極層形成工程
Ｓ４ 第２乾燥工程
Ｓ４１ ２Ａ加熱乾燥工程
Ｓ４２ ２Ｂ冷却曲げ搬送工程
Ｓ４３ ２Ｃ再加熱乾燥工程
Ｓ４４ ２Ｄ冷却曲げ搬送工程
Ｓ４５ ２Ｅ再加熱乾燥工程
Ｓ４６ ２Ｆ冷却曲げ搬送工程
Ｓ４７ ２Ｇ再加熱乾燥工程
Ｓ４８ ２Ｈ冷却曲げ搬送工程
Ｓ４９ ２Ｉ再加熱乾燥工程
Ｓ５０ ２Ｊ冷却曲げ搬送工程
Ｓ５１ ２Ｋ再加熱乾燥工程
Ｓ５２ ２Ｌ冷却曲げ搬送工程
Ｓ５３ ２Ｍ再加熱乾燥工程 1 Negative electrode plate (electrode plate)
1x Non-dried negative electrode plate (undried electrode plate)
1y Non-dried negative electrode plates (undried electrode plates)
1z One side negative electrode plate 3 Current collecting foil 5 First electrode layer 5x Undried first electrode layer 6 Second electrode layer 6x Undried second electrode layer 11 Negative electrode active material (active material) particles 12 Binder 13 Solvent 16 Binder Agent 17 Solvent 100 First drying device 300 Second drying device 110, 310, 410 Drying chamber 125 (125A to 125F) Bending conveyance roll 125c (125Ac to 125Fc) Roll surface 425 (of bending conveyance roll) Bending conveyance roll 130 Heating device EH Longitudinal direction T1 (predetermined) temperature S1 undried first electrode layer forming step S2 first drying step S21 1A heating drying step S22 1B cooling bending conveyance step S23 1C reheating drying step S24 1D cooling bending conveyance step S25 1E re Heat drying step S26 1F cooling bending conveyance step S27 1G reheating drying step S3 undried second electrode layer forming step S4 second drying process Step S41 2A Heating drying step S42 2B Cooling bending conveying step S43 2C Reheating drying step S44 2D Cooling bending conveying step S45 2E Reheating drying step S46 2F Cooling bending conveying step S47 2G Reheating drying step S48 2H Cooling bending conveying step S49 2I Reheating drying step S50 2J cooling bending conveyance step S51 2K reheating drying step S52 2L cooling bending conveyance step S53 2M reheating drying step

Claims (1)

帯状の集電箔と、上記集電箔の長手方向に沿って上記集電箔上に帯状に形成された電極層と、を備える電極板の製造方法であって、
結着剤及び溶媒を含む未乾燥電極層を上記集電箔上に有する未乾燥電極板を形成する未乾燥電極層形成工程と、
上記未乾燥電極板を上記長手方向に搬送しつつ、上記未乾燥電極層を加熱乾燥させて上記電極層を形成する乾燥工程と、を備え、
上記乾燥工程は、
上記未乾燥電極板の乾燥途中の上記未乾燥電極層を曲げ搬送ロールのロール表面に接触させて上記未乾燥電極板を厚み方向に曲げて搬送するにあたり、上記未乾燥電極層を予め定めた温度Ｔ１以下に冷却した上で、上記未乾燥電極層を上記曲げ搬送ロールの上記ロール表面に接触させる冷却曲げ搬送工程と、
上記冷却曲げ搬送工程の後、冷却した上記未乾燥電極層を再び加熱乾燥させる再加熱乾燥工程と、を含む
電極板の製造方法。 A method for producing an electrode plate comprising: a strip-shaped current collector foil; and an electrode layer formed in a strip shape on the current collector foil along the longitudinal direction of the current collector foil,
An undried electrode layer forming step of forming an undried electrode plate having an undried electrode layer containing a binder and a solvent on the current collector foil,
A drying step of forming the electrode layer by heating and drying the undried electrode layer while transporting the undried electrode plate in the longitudinal direction,
The drying step
When the undried electrode layer in the middle of drying is brought into contact with the roll surface of a bending conveyance roll and the undried electrode plate is bent and conveyed in the thickness direction, the undried electrode layer is set in a predetermined temperature. After cooling to T1 or less, a cooling bending conveyance step of bringing the undried electrode layer into contact with the roll surface of the bending conveyance roll;
After the said cooling bending conveyance process, the reheating drying process which heat-drys again the said non-dried electrode layer cooled, The manufacturing method of an electrode plate.
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