JPH10244380A - Ultrasonic welding method of a large number of laminated metallic foils - Google Patents
Ultrasonic welding method of a large number of laminated metallic foilsInfo
- Publication number
- JPH10244380A JPH10244380A JP9045662A JP4566297A JPH10244380A JP H10244380 A JPH10244380 A JP H10244380A JP 9045662 A JP9045662 A JP 9045662A JP 4566297 A JP4566297 A JP 4566297A JP H10244380 A JPH10244380 A JP H10244380A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- laminated
- ultrasonic
- large number
- metallic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
Landscapes
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は多数枚積層した金属
箔の超音波溶接に関するものであり、さらに詳しくは、
リチウム電池等に用いられる金属箔集電体の多数枚積層
溶接に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to ultrasonic welding of a multiplicity of laminated metal foils.
The present invention relates to multi-layer welding of metal foil current collectors used for lithium batteries and the like.
【０００２】[0002]
【従来の技術】従来、金属箔同士の溶接には超音波溶接
法が広く用いられてきた。一般に溶接とは、被接合物の
表面の原子相互間に引力が働き合うような数オングスト
ロームの距離に被接合物を接近させ、面全体の原子が秩
序ある配列をとって接触させることにより生じるもので
あり、（１）溶融溶接、（２）固相溶接、（３）ろう付
け等の溶接技術がある。超音波溶接は固相溶接に分類さ
れるものであり、固相溶接とは接触面をほとんど溶融し
ないか、もしくは極めて限られた薄層のみを溶融させて
接合させるものである。2. Description of the Related Art Conventionally, an ultrasonic welding method has been widely used for welding metal foils. Generally, welding is caused by bringing an object close to a distance of several angstroms such that attractive force acts between atoms on the surface of the object, and bringing the atoms of the entire surface into contact in an ordered arrangement. There are welding techniques such as (1) fusion welding, (2) solid-phase welding, and (3) brazing. Ultrasonic welding is classified as solid-phase welding. Solid-phase welding is such that the contact surface is hardly melted, or only a very limited thin layer is melted and joined.
【０００３】超音波溶接とは図１に示すように、アンビ
ル１の加工面上で被接合物である金属箔２、３を重ね、
この上からアンビル１に対して平行に振動する超音波発
振ホーン４を押しあて加圧し、この状態で超音波振動を
被接合物界面に与えるものである。超音波振動によって
生じた塑性変形により、表面に存在する酸化物等は取り
除かれ、さらに摩擦熱により原子の拡散が促進されるこ
とにより、上記のような溶接がなされる。[0003] As shown in FIG. 1, ultrasonic welding is performed by laminating metal foils 2 and 3 as objects to be joined on a processing surface of an anvil 1.
From above, the ultrasonic oscillation horn 4 vibrating in parallel to the anvil 1 is pressed and pressed, and in this state, ultrasonic vibration is applied to the interface of the workpiece. Oxide and the like existing on the surface are removed by plastic deformation caused by ultrasonic vibration, and diffusion of atoms is promoted by frictional heat, so that the above-described welding is performed.
【０００４】ここで、超音波発振ホーン４の当接面とア
ンビル１の当接面は、それぞれ一定のピッチからなるピ
ラミッド型の凹凸を有しており、この凹凸により被接合
物をグリップする。しかし、ピラミッド型の凹凸が大き
いと金属箔の切れや孔あきが生じてしまう。そのため、
特開平６−１５５０５１ごう号公報では、アンビル１の
当接面をサンドブラスト処理するとともに厚みの厚い金
属板側に超音波発振ホーンを当接させるというものが提
案されている。Here, the contact surface of the ultrasonic oscillation horn 4 and the contact surface of the anvil 1 each have pyramid-shaped irregularities having a fixed pitch, and grip the workpiece by these irregularities. However, if the pyramid-shaped irregularities are large, the metal foil may be cut or perforated. for that reason,
Japanese Patent Application Laid-Open No. H6-155051 proposes a method in which the contact surface of the anvil 1 is sandblasted and the ultrasonic oscillation horn is brought into contact with the thick metal plate.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、金属箔
を多数枚積層したものでは、アンビルの当接面をサンド
ブラスト処理しても、複数枚の接合界面をグリップする
ことはできず、積層体の下部まで超音波振動が伝わらな
い。そのため、逆に超音波発振ホーン及びアンビルの当
接面の凹凸は大きく、深くしなければならない。また、
多数枚を溶接するためにはエネルギー量を増加させる必
要がある。しかし、超音波発振ホーン及びアンビルの当
接面の凹凸を大きく、深くしたり、単にエネルギー量を
増加させると金属箔が破壊され、適切な溶接が得られな
いという問題があった。本発明の目的は、多数枚積層し
た金属箔を超音波溶接する際に、金属箔の破壊なく、良
好な溶接を得るものである。However, in the case where a large number of metal foils are laminated, even if the contact surface of the anvil is sandblasted, it is not possible to grip the bonding interface of the plurality of sheets, and the lower part of the laminated body is not gripped. Ultrasonic vibration is not transmitted until. Therefore, conversely, the irregularities of the contact surface between the ultrasonic oscillation horn and the anvil must be large and deep. Also,
In order to weld a large number of pieces, it is necessary to increase the amount of energy. However, if the contact surface of the ultrasonic oscillation horn and the anvil is made larger and deeper or the energy amount is simply increased, there is a problem that the metal foil is destroyed and proper welding cannot be obtained. An object of the present invention is to obtain good welding without breaking the metal foil when ultrasonically welding a multi-layered metal foil.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、多数枚積層した金属箔を超音波溶接法に
より溶接する場合において、多数枚積層した金属箔の上
面部、ホーン当接側に保護用の金属板を配し、超音波溶
接を行うものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method for welding a multi-layered metal foil by an ultrasonic welding method. A metal plate for protection is arranged on the contact side, and ultrasonic welding is performed.
【０００７】[0007]
【発明の実施形態】多数枚積層した金属箔の上面部、ホ
ーン当接側に保護用の金属板を配し、超音波溶接を行う
ことにより、超音波発振ホーン及びアンビルの当接面の
凹凸の大きさ、深さに関係なく、金属箔を多数枚積層し
溶接する際においても被接合物である金属箔を破壊する
ことなく良好な溶接を得ることができる。この際、保護
用の金属板は多数枚積層し溶接する金属箔と同材質であ
り、また、焼鈍した材料であることが望ましい。これ
は、同材質であるほうが金属板と金属箔間での塑性変形
の差が少ないことと溶融温度が大きく異ならないためで
ある。また、焼鈍したものを用いたほうが、超音波振動
が下部まで容易に伝達され易く、付加エネルギーをロス
し難いものと思われる。DESCRIPTION OF THE PREFERRED EMBODIMENTS A protective metal plate is arranged on the upper surface of a multi-layered metal foil, on the horn contact side, and is subjected to ultrasonic welding, so that the irregularities of the ultrasonic oscillation horn and the anvil contact surface are formed. Irrespective of the size and depth of the metal foil, good welding can be obtained without damaging the metal foil to be joined even when many metal foils are laminated and welded. At this time, the protective metal plate is preferably made of the same material as the metal foil to be laminated and welded, and is preferably an annealed material. This is because the same material has a smaller difference in plastic deformation between the metal plate and the metal foil, and the melting temperature does not greatly differ. Also, it is considered that the use of the annealed one makes it easier for the ultrasonic vibration to be easily transmitted to the lower part, and that the additional energy is hardly lost.
【０００８】さらに、保護用の金属板の厚みは５０μｍ
以上２００μｍ以下であることが望ましい。５０μｍよ
りも薄くなると、保護の役割を果たすことができず、ま
た、２００μｍ以上になると超音波振動が多数枚積層し
た金属箔側に伝達され難くなるためである。保護用の金
属板は溶接後、金属箔積層体と一体化する。Further, the thickness of the protective metal plate is 50 μm.
It is desirable that the thickness be at least 200 μm. If the thickness is less than 50 μm, it cannot play a role of protection, and if it is more than 200 μm, it is difficult for the ultrasonic vibration to be transmitted to the metal foil side on which many sheets are laminated. After welding, the protective metal plate is integrated with the metal foil laminate.
【０００９】[0009]
【実施例】以下、本発明に係る多数枚積層した金属箔の
超音波溶接法を、リチウムイオン電池用集電体であるア
ルミニウム箔及び銅箔を例に用い具体的な実施例及び比
較例を用いて記述する。 （本発明による実施例１〜７）厚さ２０μｍのアルミニ
ウム箔（A1085H-H18）を５０枚積層し、その上面に厚さ
１００μｍのアルミニウム板（A1050H-H1/4）を１枚置
き、２０ｋＨｚ、３０００Ｗ出力の超音波溶接機を用い
溶接した。この時の溶接条件は、振幅が５０μｍ、加圧
力が２００kgf/cm2、付加エネルギーが２００Ｊであっ
た。保護板の材質、硬度、厚みを変化させ、その他は本
発明の実施例１と同様にし、本発明の実施例２から７の
超音波溶接を行った。また、比較例１とし保護板を使用
しない場合も行った。使用した保護板の材質、硬度、厚
み及び溶接条件を表１に示す。この場合、アルミニウム
材にはA1050H材を用いた。超音波発振器の周波数はすべ
て２０ｋＨｚとした。EXAMPLES Hereinafter, specific examples and comparative examples will be described using the ultrasonic welding method of a multi-layered metal foil according to the present invention with an aluminum foil and a copper foil as current collectors for lithium ion batteries as an example. Describe using. (Examples 1 to 7 according to the present invention) Fifty aluminum foils (A1085H-H18) having a thickness of 20 μm are laminated, and one aluminum plate (A1050H-H1 / 4) having a thickness of 100 μm is placed on the upper surface thereof, and 20 kHz, Welding was performed using a 3000 W output ultrasonic welding machine. The welding conditions at this time were an amplitude of 50 μm, a pressing force of 200 kgf / cm 2 , and an added energy of 200 J. Ultrasonic welding of Examples 2 to 7 of the present invention was performed in the same manner as in Example 1 of the present invention except that the material, hardness and thickness of the protective plate were changed. In addition, the case where the protection plate was not used as Comparative Example 1 was also performed. Table 1 shows the material, hardness, thickness and welding conditions of the used protective plate. In this case, A1050H material was used as the aluminum material. The frequencies of the ultrasonic oscillators were all 20 kHz.
【００１０】[0010]
【表１】 [Table 1]
【００１１】次に銅箔を用いた場合について説明する。 （本発明による実施例８〜１４）厚さ３０μｍの電解銅
箔を５０枚積層し、その上面に厚さ１００μｍの銅板
（C1020-1/4H）を１枚置き、２０ｋＨｚ、３０００Ｗ出
力の超音波溶接機を用い溶接した。この時の溶接条件
は、振幅が６５μｍ、加圧力が３００kgf/cm2、付加エ
ネルギーが２０００Ｊであった。保護板の材質、硬度、
厚みを変化させ、その他は本発明の実施例８と同様に
し、本発明の実施例９から１４の超音波溶接を行った。
また、比較例２として保護板を使用しない場合も行っ
た。使用した保護板の材質、硬度、厚み及び溶接条件を
表２に示す。この場合、アルミニウム材にはC1020材を
用いた。超音波発振器の周波数はすべて２０ｋＨｚとし
た。Next, a case where a copper foil is used will be described. (Examples 8 to 14 according to the present invention) 50 electrolytic copper foils each having a thickness of 30 μm were laminated, and one copper plate (C1020-1 / 4H) having a thickness of 100 μm was placed on the upper surface thereof, and a 20 kHz, 3000 W output ultrasonic wave was used. Welded using a welding machine. The welding conditions at this time were an amplitude of 65 μm, a pressing force of 300 kgf / cm 2 , and an added energy of 2000 J. Material, hardness,
The ultrasonic welding of Examples 9 to 14 of the present invention was carried out by changing the thickness and by setting the other conditions in the same manner as in Example 8 of the present invention.
Further, as Comparative Example 2, the case where no protective plate was used was also performed. Table 2 shows the material, hardness, thickness and welding conditions of the used protective plate. In this case, a C1020 material was used as the aluminum material. The frequencies of the ultrasonic oscillators were all 20 kHz.
【００１２】[0012]
【表２】 [Table 2]
【００１３】以上のものについて、超音波溶接後の接合
状態を検討した。結果を表３，４に示す。With respect to the above, the joining state after ultrasonic welding was examined. The results are shown in Tables 3 and 4.
【００１４】[0014]
【表３】 [Table 3]
【００１５】[0015]
【表４】 [Table 4]
【００１６】溶接結果は、○、×、△とし、全く問題な
いものは○、接合はされているが、保護用の金属板に亀
裂等が生じたものは△、接合不十分もしくは接合されて
いても金属箔に亀裂等が生じたものは×とした。アルミ
ニウム箔、電解銅箔ともに、保護板がない比較例１，２
は接合はされているが金属箔上面が破壊され、亀裂等が
生じた。また、異種材料であるニッケル板を用いた本発
明による実施例２，９は接合されており、また、金属箔
の破壊も見られなかった。しかしながら、エネルギーロ
スが大きく、溶接に必要な最低エネルギー以上のエネル
ギーを付加しなければならず、さらに積層枚数を増やし
た場合に出力不足になる可能性がある。焼鈍処理してい
ない硬度Ｈ１８（アルミニウム）やＨ（銅）タイプの保
護板を用いた本発明の実施例３，１０は良好に接合さ
れ、金属箔の破壊も見られなかったが、異種材料である
ニッケル板を使った時と同様にエネルギーロスが大き
く、溶接に必要な最低エネルギー以上のエネルギーが必
要となる。これは、焼鈍した材質のほうが金属板の塑性
変形が大きく、超音波振動が下部まで容易に伝達され易
く、付加エネルギーをロスし難いものと思われる。[0016] The welding results were evaluated as "O", "x" and "△". If there was no problem at all, "O" was performed, but if the protective metal plate had cracks, etc., "△" was insufficiently bonded or bonded. Even when the metal foil had a crack or the like, it was evaluated as x. Comparative Examples 1 and 2 without protective plate for both aluminum foil and electrolytic copper foil
Was bonded, but the upper surface of the metal foil was broken, and cracks and the like occurred. Further, Examples 2 and 9 according to the present invention using a nickel plate as a dissimilar material were joined, and no destruction of the metal foil was observed. However, the energy loss is large, and energy equal to or more than the minimum energy required for welding must be added. When the number of stacked layers is further increased, the output may be insufficient. In Examples 3 and 10 of the present invention using a protection plate of hardness H18 (aluminum) or H (copper) type which had not been subjected to an annealing treatment, the bonding was good and no destruction of the metal foil was observed. As with the use of a certain nickel plate, the energy loss is large, and requires more energy than the minimum energy required for welding. This is presumably because the annealed material has a greater plastic deformation of the metal plate, the ultrasonic vibration is easily transmitted to the lower part, and the additional energy is less likely to be lost.
【００１７】保護板の厚みは３０μｍから３００μｍま
でで概ね良好な接合結果が得られているが、５０μｍよ
りも薄くなると、若干の保護板の切れが見られたが、金
属箔は破壊されていなかった。２００μｍよりも厚くな
ると切れ等の破壊はないが、接合時の付加エネルギー量
を大きくしなければ接合されにくい状態になる。よっ
て、保護板の厚みは５０μｍから２００μｍ程度がより
好ましいと思われる。本実施例には、一般的にリチウム
電池用として用いられているアルミニウム箔（A1085H-H
18）と電解銅箔を用いたが、他の組成品についても、ま
た、他の材料についても溶接最低条件は異なるものの本
発明内容に関しては同等の効果が確認されている。Although a good bonding result is generally obtained when the thickness of the protective plate is from 30 μm to 300 μm, when the thickness is less than 50 μm, the protective plate is slightly cut, but the metal foil is not broken. Was. If the thickness is more than 200 μm, breakage such as breakage does not occur, but if the amount of additional energy at the time of joining is not increased, joining becomes difficult. Therefore, it seems that the thickness of the protective plate is more preferably about 50 μm to 200 μm. In this example, aluminum foil (A1085H-H) generally used for lithium batteries was used.
Although 18) and electrolytic copper foil were used, the same effect was confirmed with respect to the content of the present invention, although the minimum welding conditions were different for other compositions and other materials.
【００１８】[0018]
【発明の効果】上述したように本発明によれば、多数枚
積層の金属箔を超音波溶接する際に、金属箔に切れや孔
あき等の破壊がなく、良好な溶接を得ることができる。
よって、アルミニウム箔や銅箔等の金属箔を集電体に用
いるリチウム電池において、集電体の多数枚積層溶接が
可能となり、より高容量な電池を得ることができる。As described above, according to the present invention, when multiple metal foils are ultrasonically welded, good welding can be obtained without breakage of the metal foil such as cuts or holes. .
Therefore, in a lithium battery using a metal foil such as an aluminum foil or a copper foil as a current collector, a large number of current collectors can be laminated and welded, and a higher capacity battery can be obtained.
【図１】金属箔の超音波溶接方法に用いる装置の説明図
である。FIG. 1 is an explanatory diagram of an apparatus used for an ultrasonic welding method of a metal foil.
Claims (4)
箔を置き、その上から該アンビルの加工面に対して平行
に振動する超音波ホーンを押し当てて金属箔同士を溶接
する超音波溶接法において、多数枚積層した金属箔の上
面部、ホーン当接側に保護用の金属板を配し、超音波溶
接することを特徴とする多数枚積層した金属箔の超音波
溶接方法。An ultrasonic wave for welding a plurality of laminated metal foils to a working surface of an anvil by pressing an ultrasonic horn vibrating in parallel to the working surface of the anvil from above. An ultrasonic welding method for a multi-layered metal foil, comprising: arranging a protective metal plate on an upper surface portion of a multi-layered metal foil and a horn contact side, and performing ultrasonic welding.
する金属箔と同材質であることを特徴とする請求項１記
載の多数枚積層した金属箔の超音波溶接方法。2. The ultrasonic welding method according to claim 1, wherein said protective metal plate is made of the same material as a metal foil to be laminated and welded.
ことを特徴とする請求項１記載の多数枚積層した金属箔
の超音波溶接方法。3. The method according to claim 1, wherein the protective metal plate is made of an annealed material.
２００μｍ以下であることを特徴とする請求項１記載の
多数枚積層した金属箔の超音波溶接方法。4. The method according to claim 1, wherein said protective metal plate has a thickness of 50 μm or more and 200 μm or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04566297A JP3209133B2 (en) | 1997-02-28 | 1997-02-28 | Ultrasonic welding method for multiple laminated metal foils |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04566297A JP3209133B2 (en) | 1997-02-28 | 1997-02-28 | Ultrasonic welding method for multiple laminated metal foils |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10244380A true JPH10244380A (en) | 1998-09-14 |
| JP3209133B2 JP3209133B2 (en) | 2001-09-17 |
Family
ID=12725598
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04566297A Expired - Lifetime JP3209133B2 (en) | 1997-02-28 | 1997-02-28 | Ultrasonic welding method for multiple laminated metal foils |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3209133B2 (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6585152B2 (en) * | 1994-10-07 | 2003-07-01 | Maxwell Technologies, Inc. | Method of making a multi-electrode double layer capacitor having single electrolyte seal and aluminum-impregnated carbon cloth electrodes |
| US6631074B2 (en) | 2000-05-12 | 2003-10-07 | Maxwell Technologies, Inc. | Electrochemical double layer capacitor having carbon powder electrodes |
| JP2007026913A (en) * | 2005-07-19 | 2007-02-01 | Matsushita Electric Ind Co Ltd | Stacked metal foil for lithium ion battery, and lithium ion battery using the same |
| US7718312B2 (en) | 2002-05-27 | 2010-05-18 | Gs Yuasa Corporation | Battery |
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1997
- 1997-02-28 JP JP04566297A patent/JP3209133B2/en not_active Expired - Lifetime
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