JP6311486B2 - Winding reel and electrode manufacturing method - Google Patents
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Description
本発明は、少なくとも一面に活物質合剤が塗布された金属箔を巻取る巻取用リール、及び電極の製造方法に関する。 The present invention relates to a winding reel for winding a metal foil coated with an active material mixture on at least one surface, and an electrode manufacturing method.
ＥＶ（Electric Vehicle）やＰＨＶ（Plug in Hybrid Vehicle）などの車両には、電動機への供給電力を蓄える蓄電装置としてリチウムイオン電池などの二次電池が搭載されている。この種の二次電池は、活物質を含有するスラリー状又はペースト状の活物質合剤が金属箔に塗布されて形成された活物質層を有するシート状の正極の電極及びシート状の負極の電極が、間にセパレータが存在する状態で層をなすように積層あるいは巻回された電極組立体を備えている。 A vehicle such as an EV (Electric Vehicle) or a PHV (Plug in Hybrid Vehicle) is equipped with a secondary battery such as a lithium ion battery as a power storage device that stores electric power supplied to the electric motor. This type of secondary battery includes a sheet-like positive electrode and a sheet-like negative electrode having an active material layer formed by applying a slurry-like or paste-like active material mixture containing an active material to a metal foil. The electrode includes an electrode assembly laminated or wound so as to form a layer with a separator in between.
正極の電極又は負極の電極の製造工程では、活物質合剤を帯状の金属箔に塗布して活物質合剤の層を形成する塗工工程が行われた後、活物質合剤の層を乾燥させる乾燥工程が行われる。さらに、プレス工程が行われた後、真空乾燥工程が行われる。なお、プレス工程では、乾燥工程を経た金属箔を巻取用リールで巻取ることで金属箔を搬送しつつ、その搬送途中に活物質合剤の層をプレスする。真空乾燥工程では、金属箔を巻取った巻取用リールごと真空乾燥装置内に収容し、巻取用リールに形成された金属箔の巻回体が真空乾燥される（例えば、特許文献１）。 In the manufacturing process of the positive electrode or the negative electrode, after the coating process of forming the active material mixture layer by applying the active material mixture to the strip-shaped metal foil, the active material mixture layer is formed. A drying step for drying is performed. Further, after the pressing process is performed, a vacuum drying process is performed. In the pressing step, the layer of the active material mixture is pressed in the middle of conveyance while the metal foil is conveyed by winding the metal foil that has passed through the drying step with a winding reel. In the vacuum drying process, the winding reel on which the metal foil is wound is housed in a vacuum drying device, and the wound body of the metal foil formed on the winding reel is vacuum dried (for example, Patent Document 1). .
真空乾燥工程では、活物質合剤に残った溶媒の蒸発の影響を受け、巻回体が巻取用リールの軸方向に巻ずれしてしまう虞があった。電極の製造工程における次行程に進んだときに巻回体が巻ずれしていた場合、巻ずれを戻すために金属箔を引っ張りながら作業することもできるが、その作業は手間であるし、引っ張ることで金属箔が破れてしまう虞がある。このため、金属箔を巻取用リールに、再度、巻直さなければならないこともあり、手間であった。 In the vacuum drying process, there is a possibility that the wound body is wound in the axial direction of the take-up reel due to the evaporation of the solvent remaining in the active material mixture. If the wound body is unwound when proceeding to the next step in the electrode manufacturing process, it is possible to work while pulling the metal foil in order to restore the unwinding, but that work is troublesome and pulls. There exists a possibility that metal foil may be torn by this. For this reason, the metal foil has to be rewound again on the take-up reel, which is troublesome.
この発明は、上記従来技術に存在する問題点に着目してなされたものであり、その目的は、巻取用リールに形成された巻回体の巻ずれが生じ難い巻取用リール及び電極の製造方法を提供することにある。 The present invention has been made paying attention to the problems existing in the above-mentioned prior art, and its purpose is to provide a winding reel and an electrode that are unlikely to cause winding displacement of the winding body formed on the winding reel. It is to provide a manufacturing method.
上記問題点を解決するための巻取用リールは、少なくとも一面に活物質合剤が塗布された帯状の金属箔を巻取り、かつ巻取った金属箔によって形成された巻回体を有したまま、前記活物質合剤の乾燥のために真空乾燥装置に収容される巻取用リールであって、前記金属箔が巻取られる芯部と、前記真空乾燥装置への設置状態で前記芯部の少なくとも上部に位置し、かつ前記巻回体の前記芯部の軸方向への移動を規制する移動規制部材と、を有し、前記移動規制部材は、前記芯部に対して着脱可能であることを要旨とする。 A take-up reel for solving the above-mentioned problems is a winding-type metal foil coated with an active material mixture on at least one surface, and has a wound body formed by the wound metal foil. A take-up reel accommodated in a vacuum drying device for drying the active material mixture, the core portion on which the metal foil is wound, and the core portion in an installed state in the vacuum drying device A movement restricting member that is positioned at least at the top and restricts movement of the core in the axial direction of the wound body, and the movement restricting member is detachable from the core. Is the gist.
これによれば、巻回体とともに巻取用リールごと乾燥させたときに、芯部の軸方向へ移動する力が巻回体に働いたとしても、芯部の軸方向への巻回体の移動が移動規制部材によって規制されるため、巻回体の巻ずれが生じ難い。また、移動規制部材は、芯部に対して脱着可能であるため、芯部から移動規制部材を取り外して金属箔の巻取りを行うことができ、金属箔の巻取時において金属箔が移動規制部材に接触して金属箔が擦れてしまうこともない。 According to this, even when the force that moves in the axial direction of the core portion is applied to the winding body when the winding reel is dried together with the winding body, the winding body in the axial direction of the core portion is not affected. Since the movement is restricted by the movement restricting member, the winding body is hardly displaced. Further, since the movement restricting member can be attached to and detached from the core part, the movement restricting member can be removed from the core part to wind the metal foil, and the metal foil is restricted when moving the metal foil. The metal foil does not rub against the member.
また、前記巻回体において前記芯部の軸方向における両端面を巻回面とすると、前記移動規制部材は、前記巻回面の少なくとも上部に対向する規制面を有することが好ましい。
これによれば、規制面を有する移動規制部材を用いることで、巻回体の巻回面に対向する面積が広くなり、巻回体の巻ずれを抑制することができる。
Moreover, when the both end surfaces in the axial direction of the said core part are used as a winding surface in the said winding body, it is preferable that the said movement control member has a control surface facing at least the upper part of the said winding surface.
According to this, by using the movement restricting member having the restricting surface, the area facing the winding surface of the wound body is widened, and the winding deviation of the wound body can be suppressed.
また、前記移動規制部材における前記芯部の外周面から突出方向における前記移動規制部材の先端までの突出長さは、前記巻回体における前記芯部の外周面から前記巻回体の外周面までの突出長さ以上であることが好ましい。 The protrusion length from the outer peripheral surface of the core part in the movement restricting member to the tip of the movement restricting member in the protruding direction is from the outer peripheral surface of the core part to the outer peripheral surface of the wound body in the winding body. It is preferable that it is more than this protrusion length.
これによれば、巻回体の最外層が移動規制部材の先端を超えないため、巻取用リールに金属箔が所定の最大量巻回された場合であっても、巻回体の巻ずれが生じ難い。
また、前記移動規制部材は複数の通気孔を有することが好ましい。
According to this, since the outermost layer of the wound body does not exceed the tip of the movement restricting member, even if the metal foil is wound on the take-up reel by a predetermined maximum amount, the winding body is displaced. Is unlikely to occur.
The movement restricting member preferably has a plurality of vent holes.
これによれば、真空乾燥装置内に供給された熱媒が通過する通気孔が複数あるため、熱媒が巻回体に向けて流れ、巻回体と熱媒を接触させ易く、真空乾燥工程における乾燥を促進することができる。 According to this, since there are a plurality of air holes through which the heating medium supplied in the vacuum drying device passes, the heating medium flows toward the wound body, and the wound body and the heating medium are easily brought into contact with each other. Drying in can be promoted.
上記課題を解決する電極の製造方法は、少なくとも一面に活物質合剤の塗布された金属箔を巻取り、該金属箔によって形成された巻回体を有する巻取用リールを真空乾燥装置に供して前記活物質合剤を真空乾燥する真空乾燥工程を含む電極の製造方法であって、前記巻取用リールの芯部に、前記金属箔を巻取って巻回体とした後、前記芯部の軸方向における前記巻回体の両巻回面に対向させて移動規制部材を取り付けた後、該移動規制部材とともに前記巻取用リールを前記真空乾燥装置に供する。 A method of manufacturing an electrode that solves the above problem is to wind up a metal foil coated with an active material mixture on at least one surface, and to provide a winding reel having a wound body formed of the metal foil to a vacuum drying apparatus. An electrode manufacturing method including a vacuum drying step of vacuum-drying the active material mixture, wherein the core portion is wound on the core portion of the winding reel to form a wound body, After the movement restricting member is attached so as to face both winding surfaces of the wound body in the axial direction, the take-up reel is provided to the vacuum drying device together with the movement restricting member.
巻取用リールの芯部に金属箔を巻取って巻回体とした後、芯部の軸方向における巻回体の両巻回面に対向させて移動規制部材を取り付けることで、芯部の軸方向へ移動する力が巻回体に働いたとしても、芯部の軸方向への巻回体の移動が移動規制部材によって規制されるため、巻回体の巻ずれが生じ難い。 After winding the metal foil on the core part of the winding reel to form a wound body, the movement restricting member is attached so as to face both winding surfaces of the wound body in the axial direction of the core part. Even if a force that moves in the axial direction acts on the wound body, the movement of the wound body in the axial direction of the core portion is restricted by the movement restricting member, so that winding of the wound body hardly occurs.
本発明によれば、巻取用リールに形成された金属箔の巻回体の巻ずれが生じ難い。 According to the present invention, the winding deviation of the metal foil wound body formed on the winding reel is unlikely to occur.
以下、巻取用リール及び電極の製造方法を具体化した一実施形態を図１〜図５にしたがって説明する。
図１に示すように、電極の製造工程は、長尺帯状の金属箔１１の一面に活物質合剤を塗布し、活物質合剤の塗工部１２を金属箔１１に有する電極材料１３を形成する塗工工程と、塗工部１２を乾燥する乾燥工程と、塗工部１２を加圧するプレス工程を有する。加えて、電極の製造工程は、塗工部１２の真空乾燥工程と、電極材料１３を電極の形状に切断する成形工程を有する。
Hereinafter, an embodiment embodying a method for manufacturing a winding reel and an electrode will be described with reference to FIGS.
As shown in FIG. 1, in the electrode manufacturing process, an active material mixture is applied to one surface of a long strip-shaped metal foil 11, and an electrode material 13 having a coating portion 12 of the active material mixture on the metal foil 11. It has the coating process to form, the drying process which dries the coating part 12, and the press process which pressurizes the coating part 12. FIG. In addition, the electrode manufacturing process includes a vacuum drying process for the coating part 12 and a molding process for cutting the electrode material 13 into the shape of the electrode.
まず、塗工工程、乾燥工程、及びプレス工程を行う生産設備３５について説明する。
図１に示すように、生産設備３５は、金属箔１１を供給する供給用リール２０を備え、この供給用リール２０には、金属箔１１がロール状に巻回されている。また、生産設備３５は、巻取機構部２７に設置される巻取用リール２４を備え、巻取用リール２４によって供給用リール２０から金属箔１１を巻取ることで、供給用リール２０から金属箔１１が供給されるとともに金属箔１１が搬送される。また、生産設備３５は、複数の搬送ローラ３９を有し、金属箔１１は、搬送ローラ３９によって下方から支持される。
First, the production facility 35 that performs the coating process, the drying process, and the pressing process will be described.
As shown in FIG. 1, the production facility 35 includes a supply reel 20 that supplies the metal foil 11, and the metal foil 11 is wound around the supply reel 20 in a roll shape. The production facility 35 includes a take-up reel 24 installed in the take-up mechanism unit 27, and the metal foil 11 is taken up from the supply reel 20 by the take-up reel 24, so that the metal is supplied from the supply reel 20. The foil 11 is supplied and the metal foil 11 is conveyed. Further, the production facility 35 includes a plurality of transport rollers 39, and the metal foil 11 is supported from below by the transport rollers 39.
生産設備３５は、金属箔１１に活物質合剤を塗布して塗工部１２を形成する塗工装置３７と、金属箔１１の搬送方向における塗工装置３７の下流側に設置される乾燥装置３８を備える。乾燥装置３８は、塗工部１２を乾燥させる。なお、活物質合剤は、活物質、導電助剤、及びバインダ（結着剤）を混合し、溶媒を添加して混練したものであり、スラリー状である。塗工工程では、塗工装置３７から金属箔１１の一面に活物質合剤が間欠的に塗布されることで金属箔１１の一面に塗工部１２が形成され、電極材料１３が形成される。 The production facility 35 includes a coating device 37 that forms the coating portion 12 by applying an active material mixture to the metal foil 11, and a drying device that is installed downstream of the coating device 37 in the conveying direction of the metal foil 11. 38. The drying device 38 dries the coating unit 12. In addition, an active material mixture mixes an active material, a conductive support agent, and a binder (binder), knead | mixes by adding a solvent, and is a slurry form. In the coating process, the active material mixture is intermittently applied to one surface of the metal foil 11 from the coating device 37, thereby forming the coating portion 12 on one surface of the metal foil 11 and forming the electrode material 13. .
乾燥装置３８は乾燥炉３８ａを備える。乾燥工程では、乾燥炉３８ａ内で塗工部１２が乾燥され、溶媒の大半が除去される。
生産設備３５は、金属箔１１の搬送方向における乾燥装置３８の下流側に設置されるプレス機構部２３を備える。プレス機構部２３は、活物質合剤を一対のプレスローラ２２により圧縮する。プレス工程では、一対のプレスローラ２２によって塗工部１２が所定の厚みまで圧縮される。プレス機構部２３を通過した金属箔１１（電極材料１３）は、巻取用リール２４に巻取られる。
The drying device 38 includes a drying furnace 38a. In the drying process, the coating unit 12 is dried in the drying furnace 38a, and most of the solvent is removed.
The production facility 35 includes a press mechanism unit 23 installed on the downstream side of the drying device 38 in the conveying direction of the metal foil 11. The press mechanism unit 23 compresses the active material mixture by the pair of press rollers 22. In the pressing step, the coating portion 12 is compressed to a predetermined thickness by the pair of press rollers 22. The metal foil 11 (electrode material 13) that has passed through the press mechanism portion 23 is taken up on a take-up reel 24.
次に、塗工部１２を真空乾燥させる真空乾燥装置７１について説明する。
図５に示すように、真空乾燥装置７１は、真空乾燥炉７１ａを備える。真空乾燥炉７１ａは載置台７２を備えており、載置台７２の凹部７２ａに巻取用リール２４を載置することで、真空乾燥炉７１ａ内に巻取用リール２４が収納される。
Next, a vacuum drying device 71 that vacuum-drys the coating unit 12 will be described.
As shown in FIG. 5, the vacuum drying apparatus 71 includes a vacuum drying furnace 71a. The vacuum drying furnace 71 a includes a mounting table 72, and the winding reel 24 is stored in the vacuum drying furnace 71 a by mounting the winding reel 24 in the recess 72 a of the mounting table 72.
次に、プレス工程後の金属箔１１（電極材料１３）を巻取り、かつ真空乾燥工程に金属箔１１ごと供される巻取用リール２４について説明する。
図１に示すように、巻取用リール２４は、巻取機構部２７にセットして使用される。
Next, the winding reel 24 that winds up the metal foil 11 (electrode material 13) after the pressing process and is provided to the vacuum drying process together with the metal foil 11 will be described.
As shown in FIG. 1, the take-up reel 24 is used by being set in a take-up mechanism portion 27.
図２、図３及び図４に示すように、巻取用リール２４は、円筒状の内筒３０を備える。内筒３０はステンレス鋼製である。内筒３０には、巻取機構部２７のシャフト（図示せず）が挿通される。巻取用リール２４の内筒３０の中心軸Ｌに沿う方向（以下、軸方向とする）への長さＷ１は、金属箔１１の短手方向への長さＷ２よりも長い。 As shown in FIGS. 2, 3, and 4, the take-up reel 24 includes a cylindrical inner cylinder 30. The inner cylinder 30 is made of stainless steel. A shaft (not shown) of the winding mechanism unit 27 is inserted into the inner cylinder 30. The length W1 of the winding reel 24 in the direction along the central axis L of the inner cylinder 30 (hereinafter referred to as the axial direction) is longer than the length W2 of the metal foil 11 in the short direction.
巻取用リール２４は、内筒３０の軸方向両端にリング状の側板３１を備える。側板３１はステンレス鋼製である。側板３１は内筒３０の径方向に突出している。側板３１の内周縁は、内筒３０の軸方向両端に接合されている。 The take-up reel 24 includes ring-shaped side plates 31 at both axial ends of the inner cylinder 30. The side plate 31 is made of stainless steel. The side plate 31 protrudes in the radial direction of the inner cylinder 30. The inner peripheral edge of the side plate 31 is joined to both axial ends of the inner cylinder 30.
巻取用リール２４は、内筒３０を囲むように内筒３０と同心円状に配置された外筒４０を備える。外筒４０はステンレス鋼製である。外筒４０と内筒３０は、側板３１によって軸方向両端で連結されている。また、外筒４０と内筒３０によって巻取用リール２４の芯部５０が構成される。芯部５０には、プレス後の金属箔１１が巻取られ、金属箔１１の巻取りが完了すると、芯部５０には、金属箔１１の巻回体１４が形成される。巻回体１４は、金属箔１１が所定の最大量巻回されたときに最も外径が大きくなる。以下、巻回体１４において芯部５０の軸方向における両端面を、巻回面１４ａとする。また、側板３１の外径は、芯部５０に形成された巻回体１４の外径よりも大きい。 The take-up reel 24 includes an outer cylinder 40 arranged concentrically with the inner cylinder 30 so as to surround the inner cylinder 30. The outer cylinder 40 is made of stainless steel. The outer cylinder 40 and the inner cylinder 30 are connected to each other at both axial ends by side plates 31. Further, the outer cylinder 40 and the inner cylinder 30 constitute a core portion 50 of the take-up reel 24. When the metal foil 11 after pressing is wound around the core portion 50 and the winding of the metal foil 11 is completed, the wound body 14 of the metal foil 11 is formed at the core portion 50. The wound body 14 has the largest outer diameter when the metal foil 11 is wound by a predetermined maximum amount. Hereinafter, both end surfaces in the axial direction of the core part 50 in the wound body 14 are referred to as a wound surface 14a. Further, the outer diameter of the side plate 31 is larger than the outer diameter of the wound body 14 formed in the core part 50.
また、芯部５０の軸方向両側であって、真空乾燥装置７１の載置台７２に巻取用リール２４を載置したとき、芯部５０の上部となる位置には、芯部５０の周方向及び軸方向に沿って孔５１が複数設けられている。 In addition, when the take-up reel 24 is placed on the placing table 72 of the vacuum drying device 71 on both sides in the axial direction of the core portion 50, the circumferential direction of the core portion 50 is located at a position above the core portion 50. A plurality of holes 51 are provided along the axial direction.
図２に示すように、芯部５０の周方向に沿って並んだ孔５１の中心を結んだ線Ｌ１は、芯部５０の軸方向に複数存在し、１本の線Ｌ１上に並ぶ複数の孔５１で１組となっている。本実施形態では、芯部５０の軸方向両側に孔５１の組が２組ずつ設けられている。複数の線Ｌ１は、互いに平行であり、側板３１の内面に対しても平行である。 As shown in FIG. 2, a plurality of lines L1 connecting the centers of the holes 51 arranged along the circumferential direction of the core portion 50 exist in the axial direction of the core portion 50, and there are a plurality of lines L1 aligned on one line L1. One set of holes 51 is provided. In the present embodiment, two sets of holes 51 are provided on both axial sides of the core part 50. The plurality of lines L1 are parallel to each other and are also parallel to the inner surface of the side plate 31.
また、巻取用リール２４は、真空乾燥炉７１ａ内に収容した状態において、芯部５０の上部であって、側板３１よりも軸方向内側に、一対の半リング状の当て板６０（移動規制部材）を有する。当て板６０は、ステンレス鋼製である。当て板６０は、外枠６１を有し、外枠６１で囲まれた内部は、複数の通気孔６２を有するメッシュ状であって、複数の針金状のステンレス鋼材が交差している。一対の当て板６０において、芯部５０の軸方向で互いに対向する内面は、巻回体１４の巻回面１４ａ上部に対向する規制面６２ａである。規制面６２ａは、複数の交差するステンレス鋼材によって形成され、ステンレス鋼材が集まってできた通気孔６２を有する面である。また、外枠６１の内周縁には、複数の突起６３が突設されている。突起６３は、１つの線Ｌ１上に並ぶ孔５１にそれぞれ嵌め込み可能である。当て板６０を芯部５０に取り付けた状態では、側板３１と当て板６０は平行である。 In addition, the take-up reel 24 is a pair of semi-ring-shaped contact plates 60 (movement restriction) on the upper side of the core portion 50 and on the inner side in the axial direction than the side plate 31 in a state of being accommodated in the vacuum drying furnace 71a. Member). The backing plate 60 is made of stainless steel. The backing plate 60 has an outer frame 61, and the inside surrounded by the outer frame 61 is a mesh shape having a plurality of ventilation holes 62, and a plurality of wire-like stainless steel materials intersect. In the pair of contact plates 60, inner surfaces facing each other in the axial direction of the core portion 50 are regulation surfaces 62 a facing the upper part of the winding surface 14 a of the wound body 14. The restricting surface 62a is a surface having a vent hole 62 that is formed by a plurality of intersecting stainless steel materials and is formed by gathering stainless steel materials. In addition, a plurality of protrusions 63 project from the inner periphery of the outer frame 61. The protrusions 63 can be fitted into the holes 51 arranged on one line L1. In a state where the contact plate 60 is attached to the core portion 50, the side plate 31 and the contact plate 60 are parallel.
図４に示すように、当て板６０において、芯部５０の外周面から突出方向における当て板６０の先端までの突出長さＮ１は、芯部５０の外周面から突出方向における側板３１の外周面までの突出長さＮ２よりも長い。さらに、突出長さＮ１は、巻回体１４において、芯部５０の外周面から巻回体１４の外周面までの突出長さＮ３よりも長い。また、芯部５０の軸方向両側において最も外側に位置する１本の線Ｌ１上に並ぶ孔５１に当て板６０を嵌めたとき、当て板６０の規制面６２ａは、芯部５０の軸方向に沿って巻回体１４の巻回面１４ａから離れている。 As shown in FIG. 4, in the contact plate 60, the protrusion length N1 from the outer peripheral surface of the core part 50 to the tip of the contact plate 60 in the protrusion direction is the outer peripheral surface of the side plate 31 in the protrusion direction from the outer peripheral surface of the core part 50. Is longer than the protruding length N2. Furthermore, the protrusion length N1 is longer than the protrusion length N3 from the outer peripheral surface of the core part 50 to the outer peripheral surface of the wound body 14 in the wound body 14. Further, when the abutting plate 60 is fitted into the holes 51 arranged on the outermost line L1 on both sides in the axial direction of the core portion 50, the restricting surface 62a of the abutting plate 60 extends in the axial direction of the core portion 50. Along the winding surface 14a, the winding body 14 is separated from the winding surface 14a.
次に、巻取用リール２４の作用について電極の製造方法とともに説明する。
電極の製造において、塗工工程と、乾燥工程と、プレス工程が行われると、プレス後の金属箔１１は、巻取用リール２４に巻取られる。次に、巻取用リール２４の孔５１に、当て板６０の突起６３を嵌め込み、巻取用リール２４に一対の当て板６０を取り付ける。すると、当て板６０の規制面６２ａは、巻回体１４の巻回面１４ａに対向する。その後、当て板６０が取り付けられた巻取用リール２４は、当て板６０が上部に位置するように真空乾燥装置７１の真空乾燥炉７１ａ内に供される。
Next, the operation of the take-up reel 24 will be described together with the electrode manufacturing method.
In the manufacture of the electrodes, when the coating process, the drying process, and the pressing process are performed, the pressed metal foil 11 is wound on the winding reel 24. Next, the protrusion 63 of the contact plate 60 is fitted into the hole 51 of the take-up reel 24, and the pair of contact plates 60 are attached to the take-up reel 24. Then, the regulation surface 62 a of the contact plate 60 faces the winding surface 14 a of the wound body 14. Thereafter, the take-up reel 24 to which the backing plate 60 is attached is supplied into the vacuum drying furnace 71a of the vacuum drying device 71 so that the backing plate 60 is positioned at the upper portion.
真空乾燥装置７１による真空乾燥工程は、真空状態における加熱乾燥で行われる。まず、図示しない減圧機によって真空乾燥炉７１ａ内を減圧した後、真空乾燥炉７１ａ内の気体を不活性ガスに置換する。その後、熱媒としての温風を真空乾燥炉７１ａ内に供給して真空乾燥炉７１ａ内を昇温させ、昇温後、塗工部１２の乾燥が所定温度で所定時間行われる。活物質合剤が加熱されると、活物質合剤に残存する溶媒が蒸発するとともに、バインダが硬化し、活物質層が形成される。 The vacuum drying process by the vacuum dryer 71 is performed by heat drying in a vacuum state. First, after the pressure in the vacuum drying furnace 71a is reduced by a decompressor (not shown), the gas in the vacuum drying furnace 71a is replaced with an inert gas. Thereafter, warm air as a heating medium is supplied into the vacuum drying furnace 71a to raise the temperature in the vacuum drying furnace 71a. After the temperature rise, the coating unit 12 is dried at a predetermined temperature for a predetermined time. When the active material mixture is heated, the solvent remaining in the active material mixture evaporates and the binder is cured to form an active material layer.
巻取用リール２４の芯部５０には、軸方向両側から巻回体１４の巻回面１４ａに対向するように一対の当て板６０が取り付けられているので、巻回体１４の巻ずれが生じ難い。
活物質合剤の乾燥が完了すると、巻取用リール２４が巻回体１４ごと真空乾燥装置７１内から取り出される。
Since the pair of contact plates 60 are attached to the core portion 50 of the winding reel 24 so as to face the winding surface 14a of the winding body 14 from both sides in the axial direction, the winding deviation of the winding body 14 is prevented. Not likely to occur.
When the drying of the active material mixture is completed, the winding reel 24 is taken out from the vacuum drying device 71 together with the wound body 14.
次に、成形工程について説明する。
まず、当て板６０を巻取用リール２４から取り外す。そして、巻取用リール２４に巻取られた金属箔１１（電極材料１３）を引き出しながら、図示しない金型を用いて打ち抜き、電極が製造される。
Next, the molding process will be described.
First, the contact plate 60 is removed from the take-up reel 24. Then, while pulling out the metal foil 11 (electrode material 13) wound on the winding reel 24, an electrode is manufactured by punching using a mold (not shown).
上記実施形態によれば、以下のような効果を得ることができる。
（１）巻取用リール２４が備える当て板６０により、真空乾燥工程において、芯部５０の軸方向へ移動する力が巻回体１４に働いたとしても、芯部５０の軸方向への巻回体１４の移動が当て板６０によって規制される。このため、巻回体１４の巻ずれが生じ難い。
According to the above embodiment, the following effects can be obtained.
(1) Even if the force which moves to the axial direction of the core part 50 acted on the winding body 14 in the vacuum drying process by the contact plate 60 provided in the winding reel 24, the winding of the core part 50 in the axial direction is performed. The movement of the rotating body 14 is regulated by the contact plate 60. For this reason, the winding deviation of the wound body 14 hardly occurs.
（２）また、当て板６０は、芯部５０に対して脱着可能である。このため、真空乾燥工程の前に行われる金属箔１１（電極材料１３）の巻取り、及び真空乾燥工程の後に行われる成形工程を、巻取用リール２４から当て板６０を取り外して行うことができる。このため、金属箔１１の巻取時や引出し時において金属箔１１が当て板６０に接触して金属箔１１や活物質層が擦れてしまうこともない。 (2) The backing plate 60 can be attached to and detached from the core portion 50. For this reason, the metal foil 11 (electrode material 13) that is performed before the vacuum drying step and the molding step that is performed after the vacuum drying step can be performed by removing the contact plate 60 from the winding reel 24. it can. For this reason, the metal foil 11 does not come into contact with the contact plate 60 when the metal foil 11 is wound or pulled out, and the metal foil 11 and the active material layer are not rubbed.
（３）規制面６２ａを有する当て板６０を用いることで、突起状の移動規制部材等と比較すると、巻回体１４の巻回面１４ａに対向する面積が広くなる。これにより、巻回体１４の巻ずれを抑制することができる。 (3) By using the contact plate 60 having the restricting surface 62a, the area facing the winding surface 14a of the wound body 14 is widened as compared with a protrusion-like movement restricting member or the like. Thereby, the winding shift of the wound body 14 can be suppressed.
（４）当て板６０において、芯部５０の外周面から突出方向における当て板６０の先端までの突出長さＮ１は、巻回体１４において、芯部５０の外周面から巻回体１４の外周面までの突出長さＮ３よりも長いことで、巻回体１４の最外層が当て板６０の先端を超えない。よって、巻取用リール２４に金属箔１１が所定の最大量巻回された場合であっても、巻回体１４の巻ずれが生じ難い。 (4) In the backing plate 60, the protruding length N1 from the outer peripheral surface of the core portion 50 to the tip of the backing plate 60 in the protruding direction is the outer periphery of the wound body 14 from the outer peripheral surface of the core portion 50 in the wound body 14. By being longer than the protruding length N3 to the surface, the outermost layer of the wound body 14 does not exceed the tip of the contact plate 60. Therefore, even when the metal foil 11 is wound on the winding reel 24 by a predetermined maximum amount, the winding body 14 is unlikely to be unwound.
（５）巻取用リール２４はメッシュ状であって、真空乾燥装置７１内に供給された熱媒が通過する通気孔６２が複数あるため、熱媒が巻回体１４に向けて流れ、巻回体１４と熱媒を接触させ易く、真空乾燥工程における乾燥を促進することができる。 (5) Since the take-up reel 24 has a mesh shape and has a plurality of vent holes 62 through which the heat medium supplied in the vacuum drying device 71 passes, the heat medium flows toward the wound body 14 and winds. The rotating body 14 and the heating medium can be easily brought into contact with each other, and drying in the vacuum drying process can be promoted.
（６）半リング状の当て板６０の規制面６２ａに巻回体１４の巻回面１４ａが接触することで、巻回体１４の上部の移動が抑えられることに伴って、巻回体１４の下部の移動も抑えられる。つまり、巻回体１４の巻回面１４ａ全体を覆うような移動規制部材を用いなくても巻回体１４の巻ずれを抑制することができるため、当て板６０の製造コストを抑えることができる。 (6) When the winding surface 14a of the wound body 14 comes into contact with the regulation surface 62a of the semi-ring-shaped backing plate 60, the movement of the upper portion of the wound body 14 is suppressed, and the wound body 14 is thereby suppressed. The movement of the lower part of the can also be suppressed. That is, since the winding deviation of the wound body 14 can be suppressed without using a movement restricting member that covers the entire winding surface 14a of the wound body 14, the manufacturing cost of the backing plate 60 can be suppressed. .
（７）当て板６０はステンレス鋼製であるため、真空乾燥工程に堪え得る。
（８）芯部５０の軸方向において最も外側に位置する１本の線Ｌ１上に並ぶ孔５１に当て板６０を嵌めたとき、当て板６０の規制面６２ａは、芯部５０の軸方向に沿って巻回体１４の巻回面１４ａから離れている。これによれば、当て板６０を芯部５０に取り付けるときに当て板６０が巻回体１４に接触し難く、当て板６０によって金属箔１１や活物質層が擦れない。
(7) Since the contact plate 60 is made of stainless steel, it can withstand a vacuum drying process.
(8) When the contact plate 60 is fitted into the holes 51 arranged on the outermost one line L1 in the axial direction of the core portion 50, the restriction surface 62a of the contact plate 60 is in the axial direction of the core portion 50. Along the winding surface 14a, the winding body 14 is separated from the winding surface 14a. According to this, when the contact plate 60 is attached to the core portion 50, the contact plate 60 is difficult to contact the wound body 14, and the metal foil 11 and the active material layer are not rubbed by the contact plate 60.
（９）芯部５０の周方向に沿って設けた複数の孔５１を、芯部５０の軸方向にも複数設けたことで、巻回体１４の軸方向の長さに合わせて当て板６０の取付位置を調節することができる。 (9) By providing a plurality of holes 51 provided along the circumferential direction of the core part 50 also in the axial direction of the core part 50, the backing plate 60 according to the axial length of the wound body 14. The mounting position of can be adjusted.
なお、上記実施形態は以下のように変更してもよい。
○ 巻取用リール２４に巻取る金属箔は、両面に塗工部１２が形成された金属箔でもよい。
In addition, you may change the said embodiment as follows.
The metal foil wound on the winding reel 24 may be a metal foil having the coating part 12 formed on both sides.
○ 乾燥工程を終えた後、金属箔１１を巻取用リール２４とは別のリールに巻付け、別のリールに巻取った金属箔を巻取用リール２４に巻取り、プレス工程後に巻取用リール２４を真空乾燥装置７１に供してもよい。 ○ After finishing the drying process, the metal foil 11 is wound around a reel different from the take-up reel 24, the metal foil taken up on another reel is taken up on the take-up reel 24, and taken up after the press process. The reel 24 may be used for the vacuum drying device 71.
○ 真空乾燥段階よりも前の段階から、巻取用リール２４に当て板６０を取り付けてもよい。このような場合、巻取用リール２４に巻取られる金属箔１１と接触し得ない位置に当て板６０を取り付けるのが好ましい。 The contact plate 60 may be attached to the take-up reel 24 from the stage prior to the vacuum drying stage. In such a case, it is preferable to attach the contact plate 60 at a position where it cannot come into contact with the metal foil 11 wound on the winding reel 24.
○ 当て板６０は、平板に複数の孔を空けた形状としてもよい。
○ 当て板６０は、通気孔６２を備えない単なる板であってもよい。
○ 巻取用リール２４は、真空乾燥工程での加熱に耐えることができるとともに、活物質合剤に含まれる溶剤に耐えることができるのであれば、ステンレス鋼以外の金属材料やセラミックスで製造されていてもよい。また、樹脂製であってもよい。同様に、側板３１及び当て板６０もステンレス以外の金属材料やセラミックスで製造されていてよい。
(Circle) the contact plate 60 is good also as a shape which opened the some hole in the flat plate.
The contact plate 60 may be a simple plate that does not include the vent hole 62.
○ The take-up reel 24 is made of a metal material or ceramics other than stainless steel as long as it can withstand the heating in the vacuum drying process and can withstand the solvent contained in the active material mixture. May be. Also, it may be made of resin. Similarly, the side plate 31 and the contact plate 60 may be made of a metal material other than stainless steel or ceramics.
○ 内筒３０及び外筒４０は円筒状に限らず、角筒状や楕円筒状等の他の筒状であってもよい。
○ 芯部５０を一重の単なる筒状としてもよい。
The inner cylinder 30 and the outer cylinder 40 are not limited to a cylindrical shape, and may be other cylindrical shapes such as a rectangular tube shape or an elliptical tube shape.
O The core part 50 is good also as a single mere cylinder shape.
○ 当て板６０は、芯部５０の軸方向片側にのみ取り付けられてもよい。
○ 移動規制部材は、リング状であってもよいし、矩形板状や楕円板状等の他の形状であってもよい。ちなみに、半リング状の移動規制部材を芯部５０の径方向における上下方向から芯部５０を挟むように取り付け、２枚の移動規制部材を接続することで、リング状の移動規制部材が形成される。
The backing plate 60 may be attached only to one axial side of the core part 50.
The movement restricting member may be ring-shaped, or may be another shape such as a rectangular plate shape or an elliptical plate shape. Incidentally, a ring-shaped movement restricting member is formed by attaching a half ring-shaped movement restricting member so as to sandwich the core part 50 from the vertical direction in the radial direction of the core part 50 and connecting the two movement restricting members. The
○ 当て板６０において、芯部５０の外周面から突出方向における当て板６０の先端までの突出長さＮ１は、巻回体１４において、芯部５０の外周面から巻回体１４の外周面までの突出長さＮ３と同一であってもよい。 In the abutting plate 60, the protruding length N1 from the outer peripheral surface of the core part 50 to the tip of the abutting plate 60 in the protruding direction is from the outer peripheral surface of the core part 50 to the outer peripheral surface of the wound body 14 in the wound body 14. It may be the same as the protruding length N3.
○ 移動規制部材は、巻回体の巻ずれを抑制することができるのであれば、その形状は板状に限られない。例えば、図６に示すように、棒片６４が、一定間隔を空けて半円弧状の外枠６１から突出するような形態であってもよい。この場合、各棒片６４の内面６４ａが巻回体１４の巻回面１４ａに接触する。 The shape of the movement restricting member is not limited to a plate shape as long as the displacement of the wound body can be suppressed. For example, as shown in FIG. 6, the bar pieces 64 may protrude from the semicircular arc-shaped outer frame 61 with a certain interval. In this case, the inner surface 64 a of each bar piece 64 contacts the winding surface 14 a of the wound body 14.
Ｎ１…突出長さ、Ｎ３…突出長さ、１１…金属箔、１４…巻回体、１４ａ…巻回体の巻回面、２４…巻取用リール、３１…側板、５０…芯部、６０…移動規制部材としての当て板、６２ａ…当て板の規制面、６２…通気孔、７１…真空乾燥装置。 N1 ... Projection length, N3 ... Projection length, 11 ... Metal foil, 14 ... Winding body, 14a ... Winding surface of winding body, 24 ... Reel for winding, 31 ... Side plate, 50 ... Core part, 60 ... a contact plate as a movement restricting member, 62a ... a restriction surface of the contact plate, 62 ... a vent, 71 ... a vacuum drying device.
Claims (5)
前記金属箔が巻取られる芯部と、
前記真空乾燥装置への設置状態で前記芯部の少なくとも上部に位置し、かつ前記巻回体の前記芯部の軸方向への移動を規制する移動規制部材と、を有し、
前記移動規制部材は、前記芯部に対して着脱可能である巻取用リール。 A vacuum dryer for drying the active material mixture while winding the belt-shaped metal foil coated with the active material mixture on at least one surface and having a wound body formed by the wound metal foil A take-up reel housed in
A core around which the metal foil is wound;
A movement restricting member that is positioned at least on the top of the core in the state of being installed in the vacuum drying device, and restricts movement of the core in the axial direction of the wound body,
The movement restricting member is a take-up reel that is detachable from the core.
前記移動規制部材は、前記巻回面の少なくとも上部に対向する規制面を有する請求項１に記載の巻取用リール。 In the wound body, when both end surfaces in the axial direction of the core portion are wound surfaces,
The winding reel according to claim 1, wherein the movement restricting member has a restricting surface facing at least an upper portion of the winding surface.
前記巻回体における前記芯部の外周面から前記巻回体の外周面までの突出長さ以上である請求項１又は請求項２に記載の巻取用リール。 The protruding length from the outer peripheral surface of the core part in the movement restricting member to the tip of the movement restricting member in the protruding direction is:
3. The take-up reel according to claim 1, wherein the winding reel has a length equal to or longer than a protruding length from an outer peripheral surface of the core portion to an outer peripheral surface of the wound body in the wound body.
前記巻取用リールの芯部に、
前記金属箔を巻取って巻回体とした後、前記芯部の軸方向における前記巻回体の両巻回面に対向させて移動規制部材を取り付けた後、該移動規制部材とともに前記巻取用リールを前記真空乾燥装置に供する電極の製造方法。 A vacuum in which a metal foil coated with an active material mixture is wound on at least one surface, and a winding reel having a wound body formed of the metal foil is subjected to a vacuum drying apparatus to vacuum dry the active material mixture A method for producing an electrode including a drying step,
In the core of the winding reel,
After winding the metal foil into a wound body, after attaching a movement restricting member so as to face both winding surfaces of the wound body in the axial direction of the core, the winding together with the movement restricting member A method for manufacturing an electrode in which a reel is used in the vacuum drying apparatus.
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