JP7124695B2 - Positive electrode manufacturing equipment - Google Patents

Positive electrode manufacturing equipment Download PDF

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JP7124695B2
JP7124695B2 JP2018245493A JP2018245493A JP7124695B2 JP 7124695 B2 JP7124695 B2 JP 7124695B2 JP 2018245493 A JP2018245493 A JP 2018245493A JP 2018245493 A JP2018245493 A JP 2018245493A JP 7124695 B2 JP7124695 B2 JP 7124695B2
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positive electrode
end member
electrode material
discharge port
outlet
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JP2020107500A (en
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勝志 榎原
拓男 柳
佑樹 寺倉
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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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Description

本願は正極の製造装置を開示するものである。 The present application discloses an apparatus for manufacturing a positive electrode.

従来から、正極シートと負極シートとをセパレータを介して捲回して構成されるリチウムイオン二次電池が知られており、このような捲回型リチウムイオン二次電池は車載用電源や携帯端末等の電源として利用されている。 Conventionally, a lithium ion secondary battery configured by winding a positive electrode sheet and a negative electrode sheet with a separator interposed therebetween has been known. is used as a power source for

捲回型リチウムイオン二次電池に用いられる正極シートは、正極箔の表面に正極材等を塗工して構成されており、正極材等が塗工された塗工部と、正極材等が塗工されていない未塗工部を備えている。負極シートも同様に、負極箔の表面に負極材等を塗工して構成されており、負極材等が塗工された塗工部と、負極材等が塗工されていない未塗工部を備えている。 A positive electrode sheet used in a wound type lithium ion secondary battery is configured by coating a positive electrode material or the like on the surface of a positive electrode foil. It has an uncoated portion that is not coated. Similarly, the negative electrode sheet is formed by coating the surface of the negative electrode foil with a negative electrode material or the like, and includes a coated portion coated with the negative electrode material or the like and an uncoated portion not coated with the negative electrode material or the like. It has

特許文献１には捲回電極体を備えた非水電解液二次電池が開示されており、正極シートの未塗工部にカーボン層を塗工することが記載されている。特許文献１では、このように未塗工部にカーボン層を塗工することにより、正極合材層の未塗工部と負極合材層との短絡を防止している。特許文献２には扁平捲回式二次電池が開示されており、電極の金属箔の未塗工部に貫通孔を設けることが記載されている。特許文献２では貫通孔を金属箔の未塗工部に設けることにより、電極をプレスすることによって生じる未塗工部の折れ曲がり等を防止している。 Patent Literature 1 discloses a non-aqueous electrolyte secondary battery having a wound electrode body, and describes coating a carbon layer on an uncoated portion of a positive electrode sheet. In Patent Literature 1, by coating the uncoated portion with the carbon layer in this manner, short-circuiting between the uncoated portion of the positive electrode mixture layer and the negative electrode mixture layer is prevented. Patent Document 2 discloses a flat wound type secondary battery, and describes that a through hole is provided in an uncoated portion of a metal foil of an electrode. In Patent Document 2, by providing a through-hole in an uncoated portion of the metal foil, bending or the like of the uncoated portion caused by pressing the electrode is prevented.

特開２０１３－９３２３８号公報JP 2013-93238 A 特開２０１５－４６２９７号公報JP 2015-46297 A

特許文献１に記載の発明は、上述のように正極の未塗工部にカーボン層を塗工し、これにより正極の未塗工部と負極との接触による短絡を防止している。このように捲回型二次電池においては、短絡耐性向上のために、正極材の端部へ端部材（絶縁材）が塗布されることが知られている。正極材に対する端部材の厚みは、十分な導電の遮断効果を奏すればよいため、薄くても問題はない。 In the invention described in Patent Document 1, the uncoated portion of the positive electrode is coated with a carbon layer as described above, thereby preventing a short circuit due to contact between the uncoated portion of the positive electrode and the negative electrode. As described above, in wound secondary batteries, it is known that an end member (insulating material) is applied to the ends of the positive electrode material in order to improve short-circuit resistance. The thickness of the end member relative to the positive electrode material does not matter even if it is thin, as long as it has a sufficient effect of blocking electrical conduction.

しかしながら、今後のエネルギー密度向上のため、あるいは全固体電池において界面抵抗削減のために、電極に更なる高線圧プレスを行うことが求められており、正極材の厚みに比して端部材の厚みが薄い状態、すなわち、端部に段差を有した状態では、高線圧プレス時に端部段差部に応力が集中し、電極割れが発生する虞があった。
一方で、正極材の厚みと端部材の厚みとを同等にした場合は、正極製造時に正極材と端部材とが混濁する虞がある。正極材と端部材とが混濁すると、その領域は電池として作用しない場合があるため、エネルギー密度が低下する虞がある。よって、このような混濁が生じる装置を用いて、間欠塗工を行うこと困難であった。 However, in order to improve the energy density in the future, or to reduce the interfacial resistance in all-solid-state batteries, it is necessary to press the electrodes with a higher linear pressure. When the thickness is thin, that is, when the end portion has a stepped portion, stress concentrates on the stepped portion of the end portion during high linear pressure pressing, which may cause electrode cracking.
On the other hand, when the thickness of the positive electrode material and the thickness of the end member are made equal, there is a possibility that the positive electrode material and the end member become turbid during manufacturing of the positive electrode. If the positive electrode material and the end member become turbid, the region may not function as a battery, and the energy density may decrease. Therefore, it has been difficult to perform intermittent coating using an apparatus that causes such turbidity.

そこで、本願は高線圧プレスを行っても電極割れが抑制され、かつ、正極材と端部材との混濁が抑制される正極の製造装置を提供することを課題とする。 An object of the present application is to provide a positive electrode manufacturing apparatus in which electrode cracking is suppressed even when high linear pressure pressing is performed, and turbidity between the positive electrode material and the end member is suppressed.

上記問題を解決するために、本発明者が装置の構成について鋭意検討した結果、以下の３点を知見した。
（１）端部材吐出口を正極材吐出口よりも正極箔の搬送方向の下流側に設ける。これにより、サックバック吸込時の逆流を抑制し、間欠塗工時にも２種液が混濁することを抑制することができる。
（２）幅方向において、正極材吐出口と端部材吐出口との間に間隔を設ける。これにより、塗工時に正極材と端部材とがウェットな状態で合流、接触することができるため、これらの厚みを同等にすることができる。
（３）正極材流路と端部材流路との間には間仕切りが形成されている。これにより、正極箔に塗工される直前まで、正極材と端部材との接触を抑制することができる。 In order to solve the above problems, the present inventor has made intensive studies on the configuration of the apparatus, and as a result, has found the following three points.
(1) The end member discharge port is provided downstream of the positive electrode material discharge port in the conveying direction of the positive electrode foil. As a result, it is possible to suppress backflow during suck-back suction, and to suppress turbidity of the two liquids even during intermittent coating.
(2) A gap is provided between the positive electrode material outlet and the end member outlet in the width direction. As a result, the positive electrode material and the end member can be brought into contact with each other in a wet state during coating, so that the thicknesses thereof can be made equal.
(3) A partition is formed between the positive electrode material channel and the end member channel. Thereby, the contact between the positive electrode material and the end member can be suppressed until immediately before the positive electrode foil is coated.

以上の知見に基づき、本願は上記課題を解決するための一つの手段として、正極箔を搬送しながら正極材及び端部材を該正極箔に塗工する正極の製造装置において、正極材を流通する少なくとも１つの正極材流路と、端部材を流通する少なくとも１つの端部材流路と、を有し、正極材流路は該正極材流路の出口であり、正極材を吐出する正極材吐出口を備え、端部材流路は該端部材流路の出口であり、端部材を吐出する端部材吐出口を備え、端部材吐出口は正極箔に塗工された正極材の端部に端部材を塗工することが可能な位置に配置されており、端部材吐出口は正極材吐出口よりも正極箔の搬送方向の下流側に設けられており、幅方向において、正極材吐出口と端部材吐出口との間には間隔が設けられており、正極材流路と端部材流路との間には間仕切りが形成されている、正極の製造装置を開示する。 Based on the above findings, the present application discloses, as one means for solving the above problems, a positive electrode manufacturing apparatus that coats a positive electrode material and an end member on the positive electrode foil while conveying the positive electrode foil, in which the positive electrode material is distributed. At least one cathode material channel and at least one end member channel that flows through the end member, the cathode material channel being an outlet of the cathode material channel and a cathode material discharger for discharging the cathode material The end member flow path is the outlet of the end member flow path, the end member discharge port is provided for discharging the end member, and the end member discharge port is at the end of the positive electrode material coated on the positive electrode foil. It is arranged at a position where the member can be coated, and the end member ejection port is provided downstream of the positive electrode material ejection port in the positive electrode foil conveying direction, and is located in the width direction with the positive electrode material ejection port. Disclosed is a positive electrode manufacturing apparatus in which a gap is provided between the end member outlet and a partition is formed between the positive electrode material flow path and the end member flow path.

本願が開示する正極の製造装置によれば、高線圧プレスを行っても電極割れが抑制され、かつ、正極材と端部材との混濁が抑制される正極を製造することができる。 According to the positive electrode manufacturing apparatus disclosed in the present application, it is possible to manufacture a positive electrode in which electrode cracking is suppressed and turbidity between the positive electrode material and the end member is suppressed even when high linear pressure pressing is performed.

製造装置１０の概略図である。1 is a schematic diagram of a manufacturing apparatus 10; FIG. ダイ２０の先端の概略図である。2 is a schematic diagram of the tip of die 20. FIG. ダイ２０内部に配置するシムシートＡ～Ｃのそれぞれの平面図である。4 is a plan view of each of shim sheets A to C arranged inside the die 20. FIG. （ａ）は、正極材および端部材の塗布時の正極の様子である。（ｂ）は、塗布停止時において、サックバックによる正極材の吸い込みを行ったときの正極の様子である。(a) is a state of the positive electrode when the positive electrode material and the end member are applied. (b) is a state of the positive electrode when the positive electrode material is sucked by suckback when the application is stopped. （ａ）は、塗工された端部材の厚みＴ２が、基準となる正極材の厚みＴ１の１００％±１０％以内の範囲に含まれる状態の一例である。（ｂ）は、塗工された端部材の厚みＴ２が、基準となる正極材の厚みＴ１の１００％±１０％を超えている状態の一例である。(a) is an example of a state in which the thickness T2 of the coated end member is within the range of 100 %± 10 % of the thickness T1 of the reference positive electrode material. (b) is an example of a state in which the thickness T2 of the coated end member exceeds 100 %± 10 % of the thickness T1 of the reference positive electrode material.

［正極の製造装置］
本開示の正極の製造装置は、正極箔を搬送しながら正極材及び端部材を該正極箔に塗工する正極の製造装置であり、例えば捲回型リチウムイオン二次電池に含まれるシート状の正極を製造するのに用いられる。図１に本開示の正極の製造装置の一実施形態である正極の製造装置１０（以下において、「製造装置１０」ということがある。）を示した。 [Positive electrode manufacturing equipment]
The positive electrode manufacturing apparatus of the present disclosure is a positive electrode manufacturing apparatus that applies a positive electrode material and an end member to the positive electrode foil while conveying the positive electrode foil. Used to make positive electrodes. FIG. 1 shows a positive electrode manufacturing apparatus 10 (hereinafter sometimes referred to as "manufacturing apparatus 10") that is an embodiment of the positive electrode manufacturing apparatus of the present disclosure.

図１に示したとおり、製造装置１０はシート状の正極箔１を搬送する不図示のロールとダイ２０とを備えている。また、ダイ２０は正極材を供給する不図示の正極材用ポンプと端部材を供給する端部材用ポンプ３０を備えている。ここで、図１に示した矢印はロールの回転方向であり、正極箔は矢印の方向に搬送される。 As shown in FIG. 1 , the manufacturing apparatus 10 includes rolls (not shown) for conveying the sheet-like positive electrode foil 1 and a die 20 . The die 20 also includes a positive electrode material pump (not shown) for supplying the positive electrode material and an end member pump 30 for supplying the end member. Here, the arrow shown in FIG. 1 indicates the rotation direction of the roll, and the positive electrode foil is conveyed in the direction of the arrow.

図２はダイ２０の先端部の概略図であり、図１のＩＩの方向からダイ２０の先端部を観察した図である。また、図３はダイ２０内部に配置するシムシートＡ～Ｃのそれぞれの平面図である。図２に記載されているとおり、ダイ２０の内部にはシムシートＡ～Ｃの積層体が配置されている。 FIG. 2 is a schematic view of the tip of the die 20, and is a view of the tip of the die 20 observed from the direction of II in FIG. 3 is a plan view of each of the shim sheets A to C arranged inside the die 20. FIG. As shown in FIG. 2, a stack of shim sheets A to C is placed inside die 20 .

なお、図２における紙面左右方向は製造装置１０（ダイ２０）の幅方向であるため、本明細書において単に「幅方向」ということがある。また、図２における紙面下側から上側に向かう方向は正極箔１の搬送方向であるため、本明細書において単に「搬送方向」ということがある。 2 is the width direction of the manufacturing apparatus 10 (the die 20), it may simply be referred to as the "width direction" in this specification. Further, since the direction from the lower side to the upper side of the paper surface in FIG. 2 is the direction in which the positive electrode foil 1 is conveyed, it may be simply referred to as the "conveying direction" in this specification.

ダイ２０は正極材を流通する正極材流路２１と、端部材を流通する端部材流路２２と、を有している。また、正極材流路２１は該正極材流路２１の出口であり、正極材を吐出する正極材吐出口２１ａを備えている。端部材流路２２は該端部材流路２２の出口であり、端部材を吐出する端部材吐出口２２ａを備えている。
さらに、端部材吐出口２２ａは、幅方向において、正極箔１に塗工された正極材の端部に端部材を塗工することが可能な位置に配置されている。
これら正極材流路２１、端部材流路２２、正極材吐出口２１ａ、端部材吐出口２２ａは、ダイ２０の内部に配置されるシムシートＡ～Ｃによって形成されている。 The die 20 has a cathode material channel 21 through which the cathode material flows, and an end member channel 22 through which the end member flows. Moreover, the positive electrode material channel 21 is an outlet of the positive electrode material channel 21, and is provided with a positive electrode material discharge port 21a for discharging the positive electrode material. The end member channel 22 is an outlet of the end member channel 22 and has an end member discharge port 22a for discharging the end member.
Furthermore, the end member discharge port 22a is arranged at a position in the width direction at which the end member can be applied to the end portion of the positive electrode material applied to the positive electrode foil 1 .
These positive electrode material channel 21 , end member channel 22 , positive electrode material discharge port 21 a and end member discharge port 22 a are formed by shim sheets A to C arranged inside the die 20 .

また、製造装置１０において、ダイ２０は２つの正極材吐出口２１ａ、及び３つの端部材吐出口２２ａを備えている。ただし、本開示の正極の製造装置においては、正極材吐出口及び端部材吐出口の個数は特に限定されず、少なくとも１つで良い。 Further, in the manufacturing apparatus 10, the die 20 has two positive electrode material outlets 21a and three end member outlets 22a. However, in the positive electrode manufacturing apparatus of the present disclosure, the number of positive electrode material outlets and end member outlets is not particularly limited, and may be at least one.

正極材吐出口２１ａの幅方向の長さは５０ｍｍ～６０ｍｍであることが好ましく、５５ｍｍ～５７ｍｍであることがより好ましく、５６±０．１ｍｍであることがより好ましい。正極材吐出口２１ａの搬送方向の長さは０．２ｍｍ～０．６ｍｍであることが好ましい。また、端部材吐出口２２ａの幅方向の長さは１．２ｍｍ～２．８ｍｍであることが好ましい。端部材吐出口２２ａの搬送方向の長さは０．１ｍｍ～０．６ｍｍであることが好ましい。ただし、これらの長さは特に限定されるものではなく、目的とする正極のサイズに応じて適宜設定することができる。 The length in the width direction of the positive electrode material outlet 21a is preferably 50 mm to 60 mm, more preferably 55 mm to 57 mm, and more preferably 56±0.1 mm. The length of the positive electrode material outlet 21a in the conveying direction is preferably 0.2 mm to 0.6 mm. Further, the length in the width direction of the end member outlet 22a is preferably 1.2 mm to 2.8 mm. The length of the end member outlet 22a in the conveying direction is preferably 0.1 mm to 0.6 mm. However, these lengths are not particularly limited, and can be appropriately set according to the size of the desired positive electrode.

正極材、端部材の材料は特に限定されないが、捲回型二次電池や捲回型リチウムイオン二次電池の正極に用いられる正極材及び端部材の公知の樹脂ペーストを用いることが好ましい。 Materials for the positive electrode material and the end member are not particularly limited, but it is preferable to use a known resin paste for the positive electrode material and the end member used for the positive electrode of a wound secondary battery or a wound lithium ion secondary battery.

ここで、正極材及び端部材がそれぞれのポンプからダイ２０に供給され、正極箔に塗工されるまでの一連の流れを説明する。
まず、正極材について説明する。正極材は正極材用ポンプからダイ２０に供給され、ダイ２０内部の正極材流路２１を通り、出口である正極材吐出口２１ａから吐出され、正極箔１に塗工される。次に、端部材について説明する。端部材は端部材用ポンプ３０から供給され、ダイ２０内部の端部材流路２２を通り、該端部材流路２２の出口である端部材吐出口２２ａから吐出され、正極箔１に塗工される。この際、端部材は正極箔１に塗工された正極材の端部に塗工される。
このようにして正極材及び端部材は正極箔１に塗工され、正極が製造されるが、製造装置１０には後述の工夫が施されており、それにより高線圧プレスを行っても電極割れが抑制され、かつ、正極材と端部材との混濁が抑制される正極を製造可能としている。以下、製造装置１０において施された工夫について説明する。 Here, a series of flows from the supply of the positive electrode material and the end member from the respective pumps to the die 20 to the coating of the positive electrode foil will be described.
First, the positive electrode material will be explained. The positive electrode material is supplied from a positive electrode material pump to the die 20 , passes through a positive electrode material flow path 21 inside the die 20 , is discharged from a positive electrode material discharge port 21 a as an outlet, and is applied to the positive electrode foil 1 . Next, the end member will be explained. The end member is supplied from the end member pump 30, passes through the end member channel 22 inside the die 20, is discharged from the end member discharge port 22a which is the outlet of the end member channel 22, and is applied to the positive electrode foil 1. be. At this time, the end member is applied to the end of the positive electrode material applied to the positive electrode foil 1 .
In this manner, the positive electrode material and the end member are applied to the positive electrode foil 1 to manufacture the positive electrode. It is possible to manufacture a positive electrode in which cracking is suppressed and turbidity between the positive electrode material and the end member is suppressed. In the following, the contrivances made in the manufacturing apparatus 10 will be described.

第１に、端部材吐出口２２ａは、搬送方向において、正極材吐出口２１ａよりも搬送方向の下流側に設けられている。これにより、サックバックによる吸い込み時における正極材および端部材の２種液の混濁を抑制することができる。これについて、図４（ａ）、（ｂ）を用いて説明する。 First, the end member ejection port 22a is provided on the downstream side in the transportation direction of the positive electrode material ejection port 21a. As a result, turbidity of the two kinds of liquids of the positive electrode material and the end member can be suppressed when the liquid is sucked by suckback. This will be described with reference to FIGS. 4(a) and 4(b).

図４（ａ）は正極材および端部材の塗布時の正極の様子であり、図４（ｂ）は塗布停止時において、サックバックによる正極材の吸い込みを行ったときの正極の様子である。図４（ａ）、（ｂ）においては、紙面下側から上側に向かう方向が搬送方向であり、紙面左右方向が幅方向である。また、図４（ａ）、（ｂ）において示した正極材吐出口２１ａ及び端部材吐出口２２ａは、正極箔１の平面上における塗工時のそれぞれの位置を示している。 FIG. 4(a) shows the state of the positive electrode when the positive electrode material and the end members are applied, and FIG. 4(b) shows the state of the positive electrode when the positive electrode material is sucked by sucking back when the application is stopped. In FIGS. 4A and 4B, the direction from the bottom to the top of the paper is the conveying direction, and the left-right direction of the paper is the width direction. 4A and 4B show the positions of the positive electrode material outlet 21a and the end member outlet 22a on the plane of the positive electrode foil 1 during coating.

図４（ａ）に示したように、正極材等のペーストを正極箔１に塗工すると、塗工されたペーストは塗工された位置よりも若干広がりをもって塗工される。そして、図４（ｂ）に示したように、塗工停止時には、サックバックによって塗布された正極材が正極材吐出口２１ａからダイ２０に吸い込まれる。
このとき、例えば端部材吐出口２２ａと正極材吐出口２１ａとが搬送方向において同じ位置にあり、幅方向において、整列しているような装置の場合、塗工された端部材は正極材吐出口２１ａの近くに存在するため、サックバックによって正極材と一緒にダイ２０に吸い込まれ、正極材と端部材とが混濁する問題が生じる。
一方で、製造装置１０では端部材吐出口２２ａが正極材吐出口２１ａよりも搬送方向の下流側に配置されているため、塗工された端部材は正極材吐出口２１ａよりも下流側に位置し、サックバックによって正極材と一緒に吸い込まれることが抑制される。よって、製造装置１０によれば、サックバックによる吸い込み時における、正極材および端部材の２種液の混濁を抑制することができる。
なお、端部材吐出口２２ａにおいてもサックバックを生じるが、塗布された電極の搬送方向の寸法において、正極材よりも端部材の方が長いため、特に悪影響がない。 As shown in FIG. 4(a), when a paste such as a positive electrode material is applied to the positive electrode foil 1, the applied paste spreads slightly from the applied position. Then, as shown in FIG. 4B, when the coating is stopped, the positive electrode material applied by suckback is sucked into the die 20 from the positive electrode material discharge port 21a.
At this time, for example, in the case of a device in which the end member discharge port 22a and the cathode material discharge port 21a are at the same position in the conveying direction and aligned in the width direction, the coated end member is located at the cathode material discharge port. Since it exists near 21a, it is sucked into the die 20 together with the positive electrode material due to suckback, causing a problem of turbidity between the positive electrode material and the end member.
On the other hand, in the manufacturing apparatus 10, the end member outlet 22a is arranged downstream of the positive electrode material outlet 21a in the conveying direction, so the coated end member is positioned downstream of the positive electrode material outlet 21a. In addition, it is suppressed from being sucked together with the positive electrode material by suckback. Therefore, according to the manufacturing apparatus 10, it is possible to suppress turbidity of the two kinds of liquids of the positive electrode material and the end member during suction by suckback.
Suckback also occurs at the end member discharge port 22a, but there is no particular adverse effect because the end member is longer than the positive electrode material in terms of the dimension of the coated electrode in the conveying direction.

なお、正極材吐出口２１ａの下流側の端部から端部材吐出口２２ａの上流側の端部までの搬送方向の長さＨは、上記の効果を奏する範囲であれば特に限定されないが、－０．２ｍｍ～０．２ｍｍであることがよい。好ましくは、０ｍｍより大きく０．２ｍｍ以下である。なお、ここでは搬送方向の上流側から下流側に向かう方向が正である。 The length H in the conveying direction from the downstream end of the positive electrode material discharge port 21a to the upstream end of the end member discharge port 22a is not particularly limited as long as the above effects are achieved. It is preferably 0.2 mm to 0.2 mm. Preferably, it is larger than 0 mm and 0.2 mm or less. Here, the direction from the upstream side to the downstream side in the transport direction is positive.

第２に、幅方向において、正極材吐出口２１ａと端部材吐出口２２ａとの間に間隔を設ける、すなわち、正極材吐出口２１ａと端部材吐出口２２ａとが重ならないように配置する。これにより、塗工時に正極材と端部材とがウェットな状態で合流、接触することができるため、これらの厚みを同等にすることができる。 Second, in the width direction, a gap is provided between the positive electrode material outlet 21a and the end member outlet 22a, that is, the positive electrode material outlet 21a and the end member outlet 22a are arranged so as not to overlap. As a result, the positive electrode material and the end member can be brought into contact with each other in a wet state during coating, so that the thicknesses thereof can be made equal.

ここで、正極材及び端部材の厚みが同等であるとは、塗工された正極材と端部材とが重なっていない位置における正極材の厚みを１００％としたとき、塗工された端部材の厚みが１００％±１０％以内であることを言う。端部材の厚みとは、正極材と端部材とが重なっていない位置における端部材の厚み、及び、正極材と端部材とが重なっている位置の厚みの両方を含む。
具体的な状態を図５（ａ）、（ｂ）に示した。図５（ａ）は塗工された端部材の厚みＴ２が基準となる正極材の厚みＴ１の１００％±１０％以内の範囲に含まれる状態の一例である。図５（ｂ）は塗工された端部材の厚みＴ２が基準となる正極材の厚みＴ１の１００％±１０％を超えている状態の一例である。
このように、製造装置１０によれば、製造される正極において、正極材と端部材との厚みを同等にすることができる。 Here, the fact that the thickness of the positive electrode material and the end member are the same means that the thickness of the positive electrode material at the position where the coated positive electrode material and the end member do not overlap is 100%, and the coated end member It means that the thickness of is within 100% ± 10%. The thickness of the end member includes both the thickness of the end member at the position where the positive electrode material and the end member do not overlap and the thickness at the position where the positive electrode material and the end member overlap.
Specific states are shown in FIGS. 5(a) and 5(b). FIG. 5A shows an example of a state in which the thickness T2 of the coated end member is within the range of 100 %± 10 % of the thickness T1 of the reference positive electrode material. FIG. 5(b) shows an example of a state in which the thickness T2 of the coated end member exceeds 100 %± 10 % of the thickness T1 of the reference positive electrode material.
As described above, according to the manufacturing apparatus 10, in the manufactured positive electrode, the thickness of the positive electrode material and the end member can be made equal.

なお、幅方向における正極吐出口２１ａと端部材吐出口２２ａとの間に設けられた間隔の長さＷ（図２）は、上記の効果を奏する範囲であれば特に限定されないが、０．４ｍｍ～１．２ｍｍであることが好ましい。また、乾燥収縮率が同等である正極材と端部材とを用いるが好ましく、これにより塗工された正極材及び端部材の厚みがさらに同等になる。 Note that the length W (FIG. 2) of the space provided between the positive electrode outlet 21a and the end member outlet 22a in the width direction is not particularly limited as long as it is within the range where the above effects are exhibited, but is 0.4 mm. It is preferably ˜1.2 mm. Moreover, it is preferable to use a positive electrode material and an end member having the same drying shrinkage rate, so that the coated positive electrode material and the end member have the same thickness.

第３に、正極材流路２１ａと端部材流路２２ａとの間には間仕切りが形成されている。ダイ２０における間仕切りとはシムシートＢのことである。これにより、正極箔に塗工される直前まで、正極材と端部材との混濁を抑制することができる。具体的には、幅方向における塗工された正極材と端部材との重なり（図５（ａ）のＸ）が２０μｍ以下にすることができる。 Thirdly, a partition is formed between the positive electrode material channel 21a and the end member channel 22a. The partition in the die 20 is the shim sheet B. As shown in FIG. As a result, turbidity between the positive electrode material and the end member can be suppressed until immediately before the positive electrode foil is coated. Specifically, the overlap (X in FIG. 5A) between the coated positive electrode material and the end member in the width direction can be 20 μm or less.

以上より、本開示の正極の製造装置の一実施形態である正極の製造装置１０について説明した。
上記において説明したとおり、本開示の正極の製造装置によれば、製造される正極は正極材と端部材との厚みが同等であるため、正極材と端部材との間に大きな段差はない。そのため、正極に対して高線圧プレスを行ったとしても、電極割れが抑制される。また、本開示の製造装置によれば、正極材と端部材との混濁が抑制することができる。従って、本開示の正極の製造装置によって製造された正極を用いることにより、エネルギー密度が向上した捲回型二次電池を製造することができる。 As described above, the positive electrode manufacturing apparatus 10 as one embodiment of the positive electrode manufacturing apparatus of the present disclosure has been described.
As described above, according to the positive electrode manufacturing apparatus of the present disclosure, since the thickness of the positive electrode material and the end member are the same in the manufactured positive electrode, there is no large step between the positive electrode material and the end member. Therefore, even if the positive electrode is subjected to high linear pressure pressing, electrode cracking is suppressed. Further, according to the manufacturing apparatus of the present disclosure, turbidity between the positive electrode material and the end member can be suppressed. Therefore, by using the positive electrode manufactured by the positive electrode manufacturing apparatus of the present disclosure, a wound secondary battery with improved energy density can be manufactured.

なお、本開示の正極の製造装置に用いられる塗工方式は、特に限定されないが、間欠塗工によって正極を製造することが好ましい。また、本開示の正極の製造装置は、負極の製造装置としても使用することができる。この場合、正極材に替えて負極材を用い、負極箔に対して塗工する。負極材としては公知の負極材を用いることができる。 The coating method used in the positive electrode manufacturing apparatus of the present disclosure is not particularly limited, but the positive electrode is preferably manufactured by intermittent coating. In addition, the positive electrode manufacturing apparatus of the present disclosure can also be used as a negative electrode manufacturing apparatus. In this case, instead of the positive electrode material, the negative electrode material is used and applied to the negative electrode foil. A known negative electrode material can be used as the negative electrode material.

１ 正極箔
１０ 正極の製造装置
２０ ダイ
２１ 正極材流路
２１ａ 正極材吐出口
２２ 端部材流路
２２ａ 端部材吐出口 1 positive electrode foil 10 positive electrode manufacturing apparatus 20 die 21 positive electrode material flow path 21a positive electrode material outlet 22 end member flow path 22a end member outlet

Claims (1)

正極箔を搬送しながら正極材及び端部材を該正極箔に塗工する正極の製造装置において、
前記正極材を流通する少なくとも１つの正極材流路と、前記端部材を流通する少なくとも１つの端部材流路と、を有し、
前記正極材流路は該正極材流路の出口であり、前記正極材を吐出する正極材吐出口を備え、
前記端部材流路は該端部材流路の出口であり、前記端部材を吐出する端部材吐出口を備え、
前記端部材吐出口は前記正極箔に塗工された前記正極材の端部に前記端部材を塗工することが可能な位置に配置されており、
前記端部材吐出口は前記正極材吐出口よりも前記正極箔の搬送方向の下流側に設けられており、
幅方向において、前記正極材吐出口と前記端部材吐出口との間には間隔が設けられており、
前記正極材流路と前記端部材流路との間には間仕切りが形成されており、
前記正極材吐出口と前記端部材吐出口とは、前記正極材吐出口から吐出された前記正極材と前記端部材吐出口から吐出された前記端部材とが重なるように構成されている、
正極の製造装置。 In a positive electrode manufacturing apparatus that coats a positive electrode material and an end member on the positive electrode foil while conveying the positive electrode foil,
having at least one positive electrode material flow path through which the positive electrode material flows, and at least one end member flow path through the end member;
The positive electrode material flow channel is an outlet of the positive electrode material flow channel, and has a positive electrode material discharge port for discharging the positive electrode material,
The end member flow path is an outlet of the end member flow path, and includes an end member discharge port for discharging the end member,
The end member outlet is arranged at a position where the end member can be applied to the end of the positive electrode material coated on the positive electrode foil,
The end member discharge port is provided downstream of the positive electrode material discharge port in the conveying direction of the positive electrode foil,
A gap is provided between the positive electrode material outlet and the end member outlet in the width direction,
A partition is formed between the positive electrode material channel and the end member channel ,
The positive electrode material discharge port and the end member discharge port are configured such that the positive electrode material discharged from the positive electrode material discharge port and the end member discharged from the end member discharge port overlap,
Positive electrode manufacturing equipment.
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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005509247A (en) 2001-06-07 2005-04-07 スリーエム イノベイティブ プロパティズ カンパニー Covered edge control
JP2017029945A (en) 2015-08-04 2017-02-09 株式会社テクノスマート Coating system and coating apparatus
JP2018176024A (en) 2017-04-05 2018-11-15 株式会社石井表記 Ink jet application device and battery manufacturing apparatus

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JPH08229480A (en) * 1995-02-24 1996-09-10 Matsushita Electric Ind Co Ltd Coating device
JPH11226469A (en) * 1998-02-16 1999-08-24 Nitto Denko Corp Stripe coating method, adhesive tape production, and stripe coating die

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Publication number Priority date Publication date Assignee Title
JP2005509247A (en) 2001-06-07 2005-04-07 スリーエム イノベイティブ プロパティズ カンパニー Covered edge control
JP2017029945A (en) 2015-08-04 2017-02-09 株式会社テクノスマート Coating system and coating apparatus
JP2018176024A (en) 2017-04-05 2018-11-15 株式会社石井表記 Ink jet application device and battery manufacturing apparatus

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