JP5369988B2 - Method and apparatus for manufacturing electrode current collector of power storage device - Google Patents

Method and apparatus for manufacturing electrode current collector of power storage device Download PDF

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JP5369988B2
JP5369988B2 JP2009186593A JP2009186593A JP5369988B2 JP 5369988 B2 JP5369988 B2 JP 5369988B2 JP 2009186593 A JP2009186593 A JP 2009186593A JP 2009186593 A JP2009186593 A JP 2009186593A JP 5369988 B2 JP5369988 B2 JP 5369988B2
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metal foil
hole
region
hole region
current collector
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JP2011040568A (en
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智之 鎌田
裕二 大山
利徳 堂園
秀秋 上原
幸雄 飯田
五一 巽
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Shin Kobe Electric Machinery Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

本発明は、リチウムイオンキャパシタやリチウムイオン電池等の蓄電デバイスに適用される電極集電体の製造方法と製造装置に関する。   The present invention relates to a method and an apparatus for manufacturing an electrode current collector applied to an electricity storage device such as a lithium ion capacitor or a lithium ion battery.

近年、環境問題がクローズアップされる中、太陽光、風力発電等によるクリーンエネルギの蓄電システムや、自動車、ハイブリッド電気自動車等の移動体用の主電源ないし補助電源として蓄電デバイスが着目されている。蓄電デバイスとしては、従来、鉛蓄電池、ニッケル水素蓄電池、リチウムイオン蓄電池が知られており、とりわけ、近時、リチウムイオン蓄電池の研究開発が盛んに行われている。また、最近では、リチウムイオン蓄電池の利点と電気二重層キャパシタの利点とを組合せた大容量（例えば、５００Ｆ以上）のリチウムイオンキャパシタないしハイブリッドキャパシタの研究開発も行なわれている。   2. Description of the Related Art In recent years, while environmental problems have been highlighted, power storage devices have attracted attention as main energy sources or auxiliary power sources for clean energy power storage systems such as solar power and wind power generation, and for moving bodies such as automobiles and hybrid electric vehicles. Conventionally, lead storage batteries, nickel metal hydride storage batteries, and lithium ion storage batteries are known as storage devices, and in particular, research and development of lithium ion storage batteries have been actively conducted recently. Recently, research and development of a large capacity (for example, 500 F or more) lithium ion capacitor or hybrid capacitor combining the advantages of a lithium ion storage battery and the advantages of an electric double layer capacitor have been conducted.

リチウムイオンキャパシタは、一般に、正極活物質に活性炭、負極活物質にリチウムイオンを吸蔵・放出可能な炭素材が用いられており、正負極を、セパレータを介して配置し、リチウム塩を含む非水電解液で浸潤した構成が採られている。また、リチウムイオン蓄電池は、一般に、正極活物質にリチウム複合酸化物、負極活物質にリチウムイオンを吸蔵・放出可能な炭素材が用いられており、正負極を、セパレータを介して配置し、リチウム塩を含む非水電解液で浸潤した構成が採られている。   In general, a lithium ion capacitor uses activated carbon as a positive electrode active material and a carbon material capable of occluding and releasing lithium ions as a negative electrode active material. The positive and negative electrodes are arranged through a separator and are non-aqueous containing lithium salt. The structure infiltrated with the electrolyte is adopted. In general, a lithium ion storage battery uses a lithium composite oxide as a positive electrode active material and a carbon material capable of occluding and releasing lithium ions as a negative electrode active material. A structure infiltrated with a non-aqueous electrolyte containing salt is employed.

これら正負極は、アルミニウム箔、銅箔等の金属箔からなる電極集電体に活物質を塗布し保持させたものである。リチウムイオンや電解液の拡散がスムーズに行なわれるように、金属箔からなる電極集電体には、多数の貫通孔が設けられている。このような貫通孔の形成には、プレス金型による打ち抜き加工のほか、電解エッチング処理、レーザー処理などが好ましい手段として採用されている（特許文献１参照）。
また、ロール装置と弾性体を組み合せたロール加圧による貫通孔の形成方法が提案されている。加工ロールと平坦ロールを対向させたロール装置を用いるものであり、加工ロールの表面には、４角形の凸部と溝部が配列・形成されている。金属箔がシート状の弾性体と重ね合せられて、ロール装置４に導入される。金属箔は、弾性体とともにロール装置で挟圧されることによって変形させられ、この変形のなかで凸部のエッジ部と変形した弾性体により剪断力を加えられ、これによって金属箔に貫通孔が形成される（特許文献２参照）。 These positive and negative electrodes are obtained by applying and holding an active material to an electrode current collector made of a metal foil such as an aluminum foil or a copper foil. A large number of through holes are provided in an electrode current collector made of a metal foil so that lithium ions and an electrolytic solution can be diffused smoothly. For the formation of such a through hole, in addition to punching with a press die, electrolytic etching treatment, laser treatment, etc. are adopted as preferable means (see Patent Document 1).
In addition, a method of forming a through hole by roll pressurizing that combines a roll device and an elastic body has been proposed. A roll device in which a processing roll and a flat roll are opposed to each other is used, and a quadrangular convex portion and a groove portion are arranged and formed on the surface of the processing roll. The metal foil is superposed on the sheet-like elastic body and introduced into the roll device 4. The metal foil is deformed by being pinched by the roll device together with the elastic body, and in this deformation, a shearing force is applied by the edge portion of the convex portion and the deformed elastic body, thereby forming a through hole in the metal foil. Formed (see Patent Document 2).

特開２００７−１４１８９７号公報JP 2007-141897 A 特開２００２−１１３５３５号公報JP 2002-113535 A

上記の特許文献１における金属箔に多数の貫通孔を設ける技術は量産性が十分でなく、コスト高となる。エッチング処理には、廃液の処理工程も必要となる。
特許文献２における金属箔に多数の貫通孔を設ける技術は量産性の改善はされるものの、貫通孔の周縁にはかえりが生成するので、プレス加工によりかえりを潰して平坦加工をすることになる。前記貫通孔は金属箔の幅方向全体に亘って形成されており、このような貫通孔を有する金属箔の側縁を一定間隔毎に切り欠いて短冊状のタブを形成する場合は、貫通孔の存在によりタブの強度が弱くなる。貫通孔を形成する際に前記タブ形成予定領域には貫通孔を形成しないことも考えられる。然るに、貫通孔を形成した領域と貫通孔を形成しない領域を有する金属箔をプレス加工して、貫通孔周縁のかえりを潰そうとすると、円滑な平坦化をできない心配がある。 The technique of providing a large number of through-holes in the metal foil in Patent Document 1 described above is not sufficient in mass productivity and increases the cost. The etching process also requires a waste liquid treatment process.
Although the technique of providing a large number of through holes in the metal foil in Patent Document 2 improves the mass productivity, burr is generated at the periphery of the through hole, so that the burr is crushed and flattened by pressing. . The through hole is formed over the entire width direction of the metal foil, and when forming a strip-shaped tab by cutting out the side edge of the metal foil having such a through hole at regular intervals, the through hole The strength of the tab is weakened due to the presence of. It is also conceivable that no through hole is formed in the tab formation scheduled region when the through hole is formed. However, if a metal foil having a region where a through hole is formed and a region where a through hole is not formed is pressed to crush the burr around the periphery of the through hole, smooth flattening may not be possible.

本発明は上記に鑑み、金属箔からなり、多数の貫通孔を設けた貫通孔領域と貫通孔を設けていない非貫通孔領域を有する蓄電デバイスの電極集電体を効率よく製造できる製造方法を提供することを課題とする。また、製造装置を提供することを課題とする。   In view of the above, the present invention provides a manufacturing method capable of efficiently manufacturing an electrode current collector for an electricity storage device, which is made of a metal foil and has a through-hole region provided with a number of through-holes and a non-through-hole region provided with no through-holes The issue is to provide. It is another object of the present invention to provide a manufacturing apparatus.

上記課題を解決するために、本発明に係る蓄電デバイスの電極集電体の製造法は、金属箔からなり、多数の貫通孔を設けた貫通孔領域と貫通孔を設けていない非貫通孔領域を有する電極集電体を次のように製造する。すなわち、金属箔に一方の面から他方の面に向かって貫通体を貫通させ引き抜くことにより多数の貫通孔を設けた貫通孔領域を形成し、貫通孔を設けない非貫通孔領域には前記一方の面から他方の面に向かって突出する多数の非貫通突出を形成する。そして、前記金属箔をプレス加工することにより、貫通孔領域に貫通孔を設けるときに生成した金属箔かえりによる突出と非貫通孔領域の非貫通突出を平らにすることを特徴とする。具体的には、所定幅で送られてくる長尺の金属箔に、回転ロールと該回転ロールに対して金属箔を反対側から支える支持部材とを用いる蓄電デバイスの電極集電体の製造方法であって、回転ロールとして、圧接した金属箔を貫通して金属箔に貫通孔を設けるために支持部材に一定深さまで侵入するための貫通体を植設した一定幅の領域（貫通孔領域）と圧接した金属箔にエンボス加工を施すために凹凸を付した一定幅の領域（非貫通孔領域）とを有する回転ロールを準備し、支持部材として、その表面が自己復元性と自己修復性とを有する弾力性のある天然ゴムまたは合成ゴムで構成されるバックアップロールを準備し、金属箔の送り速度を１ｍ／分〜１０ｍ／分として、回転ロールとバックアップロールとにより、長尺の金属箔に貫通孔領域と非貫通孔領域とを形成する第１の工程と、該第１の工程に続き、貫通孔領域と非貫通孔領域とを形成した金属箔を線圧略２００ｋｇ／ｃｍでプレス加工する第２の工程と、を備えた蓄電デバイスの電極集電体の製造方法とする。 In order to solve the above-mentioned problems, a method for manufacturing an electrode current collector of an electricity storage device according to the present invention comprises a metal foil and a through-hole region provided with a number of through-holes and a non-through-hole region provided with no through-holes An electrode current collector having the following is manufactured as follows. That is, a through-hole region having a large number of through-holes is formed by penetrating the metal foil from one surface to the other surface and withdrawing the metal foil. A large number of non-penetrating protrusions that protrude from one surface toward the other surface are formed. Then, by pressing the metal foil, the protrusion by the metal foil burr generated when the through hole is provided in the through hole region and the non-through protrusion of the non-through hole region are made flat. Specifically, a method of manufacturing an electrode current collector of an electricity storage device using a rotating roll and a support member that supports the rotating foil from the opposite side to a long metal foil sent in a predetermined width As a rotating roll, a region having a constant width (through-hole region) in which a penetrating body for penetrating the support member to a certain depth is provided so as to penetrate the pressed metal foil and provide a through-hole in the metal foil. In order to emboss the pressed metal foil, a rotating roll having a certain width region (non-through-hole region) with unevenness is prepared, and the surface of the supporting member is self-restoring and self-repairing. A backup roll made of elastic natural rubber or synthetic rubber having a metal foil is prepared, and the metal foil feed speed is set to 1 m / min to 10 m / min. Through hole area And a first step of forming the non-through-hole region, and a second step of pressing the metal foil having the through-hole region and the non-through-hole region at a linear pressure of about 200 kg / cm following the first step. And a process for producing an electrode current collector of an electricity storage device.

本発明によれば、機械的な操作で貫通孔を設け、貫通孔を設けるときに生成した金属箔のかえりをプレス加工により平らにするので、量産性に優れた効率の良い製造をすることができる。プレス加工では、非貫通孔領域に非貫通突出を形成しておくことにより、これが貫通孔領域の金属箔のかえりによる突出をプレスする際に一緒にプレスされる。貫通孔領域と非貫通孔領域が一様にプレスされるので、プレス加工により平らにした金属箔の変形が抑制される。
非貫通孔領域に非貫通突出を形成しておかないと、プレス加工では、金属箔のかえりによる突出で厚みが増している貫通孔領域だけが主としてプレスされることになり、金属箔は貫通孔領域で非貫通孔領域より延びが大きくなり変形してしまう。非貫通孔領域に非貫通突出を形成しておくことが、金属箔の均一なプレスに重要である。
さらに、金属箔の送り速度を１ｍ／分〜１０ｍ／分として、回転ロールとバックアップロールとにより、長尺の金属箔に貫通孔領域と非貫通孔領域とを形成する第１の工程と、該第１の工程に続き、貫通孔領域と非貫通孔領域とを形成した金属箔を線圧略２００ｋｇ／ｃｍでプレス加工する第２の工程と、を備えたことにより、従来の打ち抜き加工で貫通孔を形成する手法と比較して、２倍〜２００倍の送り速度を実現でき、プレス加工後の貫通孔の平均孔径を０．１ｍｍとすることができた。 According to the present invention, the through hole is provided by mechanical operation, and the burr of the metal foil generated when the through hole is provided is flattened by pressing, so that it is possible to manufacture efficiently with excellent mass productivity. it can. In the press working, a non-through protrusion is formed in the non-through hole region, and this is pressed together when pressing the protrusion of the through hole region due to the burr of the metal foil. Since the through-hole region and the non-through-hole region are uniformly pressed, deformation of the metal foil flattened by pressing is suppressed.
Unless a non-penetrating protrusion is formed in the non-penetrating hole area, in the pressing process, only the penetrating hole area whose thickness is increased due to the protrusion due to the burr of the metal foil is mainly pressed. In the region, the extension becomes larger than the non-through hole region, and the region is deformed. It is important for the uniform pressing of the metal foil to form a non-through protrusion in the non-through hole region.
Furthermore, the 1st process of forming a through-hole area | region and a non-through-hole area | region in elongate metal foil with a rotating roll and a backup roll by making the feed speed of metal foil into 1m / min-10m / min, Subsequent to the first step, the second step of pressing the metal foil in which the through-hole region and the non-through-hole region are formed at a linear pressure of about 200 kg / cm is provided. Compared with the method of forming holes, a feed rate of 2 to 200 times could be realized, and the average hole diameter of the through holes after press working could be 0.1 mm.

非貫通孔領域は、貫通孔を有しないことからプレス加工後も十分な引張り強度を有している。   The non-through hole region has sufficient tensile strength even after press working since it does not have a through hole.

本発明の実施形態において、金属箔に貫通孔領域と非貫通孔領域を設ける様子を説明する斜視図である。In embodiment of this invention, it is a perspective view explaining a mode that a through-hole area | region and a non-through-hole area | region are provided in metal foil. 本発明の実施形態において、貫通孔領域と非貫通孔領域を説明する要部断面図である。In embodiment of this invention, it is principal part sectional drawing explaining a through-hole area | region and a non-through-hole area | region. 本発明を適用して製造した電極集電体の例を示す平面図である。It is a top view which shows the example of the electrode electrical power collector manufactured by applying this invention.

以下、図面を参照して、本発明の実施の形態について説明する。
図３は、本発明の実施の形態を適用して製造した電極集電体である。金属箔の貫通孔領域２は活物質が保持される領域であり、非貫通孔領域３は、長さ方向に所定間隔で切り欠いて切り欠き残部をリード片４としたものである。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 3 shows an electrode current collector manufactured by applying the embodiment of the present invention. The through-hole region 2 of the metal foil is a region where the active material is held, and the non-through-hole region 3 is formed by cutting out the remaining portion of the lead piece 4 at a predetermined interval in the length direction.

このような電極集電体の製造の実施の形態を図１に基づいて説明する。
所定幅で送られてくる長尺の金属箔１に、一方の面から他方の面に向かって貫通体を貫通させ引き抜くことにより多数の貫通孔を設けた貫通孔領域２を形成する。貫通孔を設けない非貫通孔領域３には前記一方の面から他方の面に向かって突出する多数の非貫通突出を形成する。具体的には、送られてくる金属箔１に圧接する回転ロール１０と回転ロール１０に圧接する金属箔１を反対側から支える支持部材１１を備え、これを、金属箔１に貫通孔領域２と非貫通孔領域３を形成する第１ステーションとする。 An embodiment of manufacturing such an electrode current collector will be described with reference to FIG.
A through-hole region 2 provided with a large number of through-holes is formed in a long metal foil 1 fed with a predetermined width by passing through the through body and pulling it out from one surface to the other surface. A large number of non-through protrusions that protrude from the one surface toward the other surface are formed in the non-through hole region 3 where no through hole is provided. Specifically, a rotating roll 10 that is pressed against the metal foil 1 that is sent and a support member 11 that supports the metal foil 1 that is pressed against the rotating roll 10 from the opposite side are provided. And a first station for forming the non-through-hole region 3.

回転ロール１０の周面には、圧接した金属箔１を貫通して金属箔１に貫通孔を設けるための貫通体１２を多数植設した一定幅の領域と、圧接した金属箔１にエンボス加工を施すための多数の凹凸１３を付した一定幅の領域を有している。支持部材１１は、回転ロール１０と対をなすバックアップロールであり、表面は自己復元性、自己修復性を有する天然ゴム、合成ゴム等の弾力性のある材質からなっている。回転ロール１０と支持部材１１の間に金属箔を送り込むと、貫通体１２が金属箔２を貫通した後引き抜かれ、順次、貫通孔領域２が金属箔の長さ方向に帯状に形成される。貫通体１２が金属箔１を貫通したとき、その先端は、支持部材１１に一定深さまで侵入する。貫通体１２が引き抜かれると、支持部材１１にできた孔は自己修復性により塞がれる。また、凹凸１３が金属箔１を介して支持部材１１の表面を押圧して変形させ、このエンボス加工により、金属箔の長さ方向の帯状の非貫通孔領域３に多数の非貫通突出が形成される。   On the peripheral surface of the rotating roll 10, a region having a certain width in which a large number of penetration bodies 12 for penetrating the pressed metal foil 1 and providing through holes in the metal foil 1 are planted, and the pressed metal foil 1 is embossed. It has a region of a certain width with a large number of projections and depressions 13. The support member 11 is a backup roll that makes a pair with the rotary roll 10, and the surface is made of an elastic material such as natural rubber or synthetic rubber having self-restoring property and self-healing property. When the metal foil is fed between the rotary roll 10 and the support member 11, the penetrating body 12 is pulled out after passing through the metal foil 2, and the through-hole region 2 is sequentially formed in a strip shape in the length direction of the metal foil. When the penetrating body 12 penetrates the metal foil 1, the tip penetrates into the support member 11 to a certain depth. When the penetrating body 12 is pulled out, the hole formed in the support member 11 is closed by self-repairing. Further, the unevenness 13 presses and deforms the surface of the support member 11 through the metal foil 1, and by this embossing, a large number of non-through protrusions are formed in the band-like non-through hole region 3 in the length direction of the metal foil. Is done.

図２に、上記により形成された貫通孔領域２と非貫通孔領域３を有する金属箔の断面図を示す。
貫通孔領域２の貫通孔５の周囲には、貫通体１２の侵入により生成した金属箔のかえり６ができている。また、非貫通孔領域３には凹凸１３の嵌入によりできた非貫通突出７ができている。 FIG. 2 shows a cross-sectional view of a metal foil having the through-hole region 2 and the non-through-hole region 3 formed as described above.
Around the through hole 5 in the through hole region 2, a metal foil burr 6 generated by the penetration of the through body 12 is formed. The non-through hole region 3 has a non-penetrating protrusion 7 made by fitting the unevenness 13.

上記において、非貫通孔領域３を形成するために、回転ロール１０における凹凸１３を付した一定幅領域に対向した支持部材１１の領域は、貫通体１２を多数植設した一定幅の領域に対向した支持部材１１の領域より弾力性を大きくし、あるいは、硬度を小さくして軟らかくすることが好ましい。これによって、凹凸１３が、金属箔１の上から支持部材１１に容易に押し込まれ、良好なエンボス加工を施すことができる。   In the above, in order to form the non-through-hole region 3, the region of the support member 11 facing the constant width region provided with the unevenness 13 in the rotary roll 10 is opposed to the constant width region where a large number of through bodies 12 are implanted. It is preferable to make the elasticity greater than the area of the support member 11 or to make the hardness soft by reducing the hardness. Thereby, the unevenness | corrugation 13 is easily pushed into the supporting member 11 from on the metal foil 1, and can perform favorable embossing.

このように貫通孔領域２と非貫通孔領域３を形成した金属箔をプレス加工して、金属箔のかえり６と非貫通突出７を潰し、表面を平らにする。プレス加工は、一対の加圧ロールの間隙に金属箔を通すことで行なう。製造装置における第２ステーションの具体的な構成は、前記一対の加圧ロールである。
貫通孔領域２と非貫通孔領域３の両方を均等にプレスできるので、両領域のプレスによる延びも均等になり、プレス後の金属箔の変形が抑制される。貫通孔領域２には活物質が保持され、活物質保持後の適宜の工程で、非貫通孔領域３は、長さ方向に所定間隔で切り欠いて切り欠き残部をリード片４とする。リード片４にはその基部から先端に亘って貫通孔がないので、十分な強度を有する。尚、リード片４は、非貫通孔領域３に溶接により一体化しても良い。この場合も、溶接箇所に貫通孔がないので、信頼性ある溶接をすることができる。 The metal foil in which the through-hole region 2 and the non-through-hole region 3 are formed in this way is pressed to crush the metal foil burr 6 and the non-through protrusion 7 so that the surface is flattened. The press working is performed by passing a metal foil through a gap between a pair of pressure rolls. A specific configuration of the second station in the manufacturing apparatus is the pair of pressure rolls.
Since both the through-hole area | region 2 and the non-through-hole area | region 3 can be pressed equally, the extension by the press of both area | regions will also become equal, and the deformation | transformation of the metal foil after a press will be suppressed. An active material is held in the through-hole region 2, and the non-through-hole region 3 is notched at a predetermined interval in the length direction in an appropriate process after holding the active material, and the remaining part of the notch is used as a lead piece 4. Since the lead piece 4 does not have a through hole from its base to the tip, it has sufficient strength. The lead piece 4 may be integrated with the non-through hole region 3 by welding. Also in this case, since there is no through-hole in the welding location, reliable welding can be performed.

上記の実施の形態では、非貫孔通領域にエンボス加工により非貫通突出を形成したが、非貫通孔領域に硬い粒子を吹き付けるブラスト処理により非貫通突出を形成してもよい。   In the above embodiment, the non-penetrating protrusion is formed by embossing in the non-penetrating hole region, but the non-penetrating protrusion may be formed by a blasting process in which hard particles are sprayed to the non-penetrating hole region.

上記実施の形態による方法と装置により、負極集電体用として、厚さ１６μｍの銅箔に貫通孔領域と非貫通孔領域を形成した。貫通孔領域は幅方向の長さを９２ｍｍ、非貫通孔領域は幅方向の長さを３０ｍｍとした。
貫通孔領域に設けた貫通孔は直径が０．２ｍｍの円形で、開口率は２０％であり、貫通孔が略均等に配置されている。プレス加工前の貫通孔周縁には、おおよそ高さ０．１mmの金属箔のかえりができている。
また、非貫通孔領域の非貫通突出は高さが０．１mmで、基部の径が０．１５mmである。 By the method and apparatus according to the above embodiment, through-hole regions and non-through-hole regions were formed in a copper foil having a thickness of 16 μm for the negative electrode current collector. The through-hole region was 92 mm in length in the width direction, and the non-through-hole region was 30 mm in length in the width direction.
The through holes provided in the through hole region are circular with a diameter of 0.2 mm, the aperture ratio is 20%, and the through holes are arranged substantially evenly. A metal foil burr with a height of approximately 0.1 mm is formed on the periphery of the through hole before pressing.
Further, the non-through protrusion of the non-through hole region has a height of 0.1 mm and a base diameter of 0.15 mm.

上記の貫通孔領域と非貫通孔領域を有する金属箔を、線圧２００ｋｇ／ｃｍで一対の加圧ロールの間隙に通して、金属箔のかえりと非貫通突出を潰して平らにした。このプレス加工後の貫通孔径は、平均で０．１mmであった。   The metal foil having the through-hole region and the non-through-hole region was passed through a gap between a pair of pressure rolls at a linear pressure of 200 kg / cm, and the metal foil burr and non-through protrusion were crushed and flattened. The average through-hole diameter after the press working was 0.1 mm.

この一連の工程は、銅箔の送り速度を１０ｍ／分に設定して実施することができた。   This series of steps could be carried out with the copper foil feed rate set to 10 m / min.

銅箔送り速度は、従来の打ち抜き加工で貫通孔を形成する手法では０．０５〜０．５ｍ／分が適正範囲であるのに対し、本実施例では１ｍ／分〜１０ｍ／分の高速で対応が可能となった。   The copper foil feed speed is 0.05 to 0.5 m / min in the proper range in the conventional method of forming a through hole by punching, whereas in this embodiment, the copper foil feed speed is 1 m / min to 10 m / min. It became possible to respond.

プレス加工後に金属箔の変形は認められなかった。尚、非貫通孔領域に非貫通突出を設けずプレス加工を実施した後の金属箔は、貫通孔領域の側縁に変形が認められ、その後の活物質の塗工工程に供することができなかった。   No deformation of the metal foil was observed after pressing. In addition, the metal foil after performing the press work without providing the non-penetrating protrusion in the non-penetrating hole region is recognized to be deformed at the side edge of the penetrating hole region and cannot be used for the subsequent active material coating process. It was.

１ 金属箔
２ 貫通孔領域
３ 非貫通孔領域
４ リード片
５ 貫通孔
６ 金属箔のかえり
７ 非貫通突出
１０ 回転ロール
１１ 支持部材（バックアップロール）
１２ 貫通体
１３ 凹凸 DESCRIPTION OF SYMBOLS 1 Metal foil 2 Through-hole area | region 3 Non-through-hole area | region 4 Lead piece 5 Through-hole 6 Metal foil burr 7 Non-through protrusion 10 Rotating roll 11 Support member (backup roll)
12 Penetration body 13 Concavity and convexity

Claims (1)

所定幅で送られてくる長尺の金属箔に、回転ロールと該回転ロールに対して前記金属箔を反対側から支える支持部材とを用いる蓄電デバイスの電極集電体の製造方法であって、  A method for producing an electrode current collector for an electricity storage device using a rotating roll and a supporting member that supports the rotating roll from the opposite side to a long metal foil sent in a predetermined width,
前記回転ロールとして、前記圧接した金属箔を貫通して金属箔に貫通孔を設けるために前記支持部材に一定深さまで侵入するための貫通体を植設した一定幅の領域（貫通孔領域）と前記圧接した金属箔にエンボス加工を施すために凹凸を付した一定幅の領域（非貫通孔領域）とを有する回転ロールを準備し、  As the rotating roll, a region having a constant width (through-hole region) in which a penetrating body for penetrating the support member to a certain depth is provided so as to penetrate the pressed metal foil and provide a through-hole in the metal foil. Preparing a rotating roll having a certain width region (non-through-hole region) with unevenness for embossing the pressed metal foil,
前記支持部材として、その表面が自己復元性と自己修復性とを有する弾力性のある天然ゴムまたは合成ゴムで構成されるバックアップロールを準備し、  As the support member, prepare a backup roll made of elastic natural rubber or synthetic rubber whose surface has self-restoration and self-healing properties,
前記金属箔の送り速度を１ｍ／分〜１０ｍ／分として、前記回転ロールと前記バックアップロールとにより、前記長尺の金属箔に前記貫通孔領域と前記非貫通孔領域とを形成する第１の工程と、  A first feed rate of the metal foil is 1 m / min to 10 m / min, and the through-hole region and the non-through-hole region are formed in the long metal foil by the rotating roll and the backup roll. Process,
該第１の工程に続き、前記貫通孔領域と前記非貫通孔領域とを形成した金属箔を線圧略２００ｋｇ／ｃｍでプレス加工する第２の工程と、  Following the first step, a second step of pressing the metal foil in which the through-hole region and the non-through-hole region are formed at a linear pressure of approximately 200 kg / cm,
を備えたことを特徴とする蓄電デバイスの電極集電体の製造方法。  A method for producing an electrode current collector for an electricity storage device.
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