JP3681928B2 - Method for joining battery electrode bodies - Google Patents

Method for joining battery electrode bodies Download PDF

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Publication number
JP3681928B2
JP3681928B2 JP21496799A JP21496799A JP3681928B2 JP 3681928 B2 JP3681928 B2 JP 3681928B2 JP 21496799 A JP21496799 A JP 21496799A JP 21496799 A JP21496799 A JP 21496799A JP 3681928 B2 JP3681928 B2 JP 3681928B2
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electrode body
electrode
battery
current extraction
extraction terminal
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JP2001038475A (en
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守 下田
友康 竹内
義彦 松坂
康二 藤木
耕 野崎
吾朗 渡辺
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Denso Corp
Toyota Motor Corp
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Denso Corp
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

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  • Connection Of Batteries Or Terminals (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、シート状部材が積層された積層体と被接合部材とを超音波接合法により接合する積層体の接合方法に関する。特に、電池における電極板と電流取り出し端子との接合に用いられる接合方法に関する。
【０００２】
【従来の技術】
近年、自動車用バッテリー等に用いられる電池においても、高性能化が求められている。具体的には、自動車用バッテリーの高出力化および高エネルギー密度化が要求されており、この要求を満たす二次電池として、ニッケル水素二次電池、リチウムイオン二次電池をあげることができる。
【０００３】
また、このような二次電池は、密閉された電池ケースの中に、正極および負極が対向して配置された電極体を有している。この二次電池は、対向して配置された正極および負極の間に電極反応が生じ、正極および負極のそれぞれに電気的に接続された外部端子を用いて電流を取り出している。さらに、電極体は、電池の電流密度を向上させるために、電極板面積を広くとることが求められ、シート状の正極板および負極板とをお互いに対向した状態で積層あるいは、巻回させた電極体としている。
【０００４】
ここで、従来の小型二次電池においては、正極および負極よりなる電極体と、外部端子との接続は、電極板にもうけられた細いタブ（１本）を接合することでなされていた。
【０００５】
しかし、自動車用バッテリーのように大電流が求められる電池においては、タブ数を増やすことで電流を効率よく取り出す構造や、積層あるいは巻回された電極体の電極板に活物質の未塗布部をもうけ、この未塗布部をまとめて直接端子に接合する等の方法により、高性能化が進められている。このような高性能化の手段において、電極と端子との接続には、超音波による接合が、広い面積を短時間で接合させる方法として多く用いられている。
【０００６】
しかし、シート状電極板の多層体と電流取り出しの端子との超音波接合においては、電極板の各層および電流取り出し端子を一体的に接合する上で、電極板の積層枚数の増加に応じて接合時に付与される超音波エネルギーを高出力化させる必要があった。しかし、高出力域での条件により接合状態を満足しようとした場合、接合部および接合部周辺に過大なストレスを与えてしまい、電極体を構成するシート状の電極板が強度不足により破れてしまうという問題を有していた。
【０００７】
特に、リチウムイオン二次電池の場合には、電極板および電流取り出し端子にアルミ、銅が一般的に用いられるが、これらの材質は接合が困難であることからシート状の電極板にダメージを与えることなく完全な接合状態を得ることは困難な技術であった。
【０００８】
このように、シート状部材が積層した構造を有する積層体に、異種部材を一体的に接合することは困難を有していた。
【０００９】
【発明が解決しようとする課題】
本発明は上記実状に鑑みてなされたものであり、電池の電極体と電流取り出し端子とを接合するときに、電池の電極体にダメージを与えることなく接合できる接合方法を提供することを課題とする。
【００１０】
【課題を解決するための手段】
上記課題を解決するため本発明者等は、超音波接合法について検討を重ねた結果、電流取り出し端子が電極体の厚さと同じ厚さの突起部を有し、この突起部が電池の電極体と重ね合わされた状態で超音波振動を付与することで上記課題を解決できることを見出した。
【００１１】
すなわち、本発明の電池の電極体の接合方法は、シート状電極板が積層した構造を有する電池の電極体と、電極体に重ね合わされた電流取り出し端子と、に超音波振動を付与して、電極体のシート状電極板同士および電極体と電流取り出し端子とを接合させる電池の電極体の接合方法であって、電流取り出し用端子は、電極体との重ね合わせ部に突出した突起部を有し、突起部は重ね合わされた部分の電極体の厚さと略同一の高さを有し、突起部が該電極体を押圧した状態で超音波振動が付与されることを特徴とする。
【００１２】
本発明の電池の電極体の接合方法は、電流取り出し端子の電極体との接合面に突起部をもうけることで、超音波接合法における超音波振幅エネルギーを局部的に、吸収、拡散させ、超音波接合プロセスの高効率化を図っている。このため、電極体の接合部および接合部周辺において、超音波振動による発熱、破れ、ホーンの食い込みを抑制し、接合面の高品質化が達成される。
【００１３】
【発明の実施の形態】
本発明の電池の電極体の接合方法は、電極体と、突起部を有する電流取り出し端子とを、重ね合わせた状態で超音波振動を付与することにより接合する接合方法である。
【００１４】
本発明の電池の電極体の接合方法は、電極体と電流取り出し端子とを、重ね合わせた状態で超音波振動を付与する超音波接合法によりなされる。超音波接合法は、当接した二つの部材に超音波振動を付与することにより、お互いに当接面同士が相対的に振動し、この振動のエネルギーにより、お互いの表面の原子が移動・拡散することで接合される。
【００１５】
電池の電極体は、シート状電極板が積層した構造を有する。
【００１６】
電流取り出し端子は、電極体との重ね合わせ部に突出した突起部を有する。この突起部を有することで、超音波接合時に付与される超音波振幅エネルギーを局部的に付与でき、積層体と被接合部材とを一体的に接合させる。
【００１７】
すなわち、電流取り出し端子を電極体と重ね合わせたときに、電流取り出し端子にもうけられた突起部が局部的に電極体を押圧することとなる。すなわち、突起部が電極体を押圧することとなり、押圧面積が小さくなるとともに、電極体を加圧する加圧力が増大する。
【００１８】
電極体は、シート状電極板が積層あるいは巻回して形成されていることが好ましい。すなわち、電極体は、電流取り出し端子との接合部において、シート状電極板が積層した構造を有していればよい。このような構造として、シート状電極板の積層体および巻回体をあげることができる。
【００１９】
突起部は、錐状に形成されていることが好ましい。すなわち、突起部が先端方向に向かって絞られた錐状に形成されることで、突起部が重ね合わせ部において局部的に電極体を押圧するようになる。ここで、突起部の錐状とは、先端方向に向かって絞られている形状をいい、先端部が尖った円錐や角錐だけでなく、円錐や角錐の先端部が欠けた形状である錐台形状も含んでいる。
【００２０】
突起部は、重ね合わされた部分の電極体の厚さと略同一の高さを有することが好ましい。すなわち、突起部の高さが低すぎると、突起部による電極体の局部的な加圧が不十分となり、高さが高くなると突起部が電極体を構成するシート状電極板にダメージを与えるようになる。
【００２１】
電極体を構成するシート状電極板および電流取り出し端子は、アルミ、銅、ニッケル、ステンレス鋼より選ばれる金属を主成分とすることが好ましい。ここで、これらの金属より選ばれる金属を主成分とするということは、これらの金属の純金属およびこれらを主成分とする合金をシート状電極板および電流取り出し端子に用いられることを示している。
【００２７】
本発明の電池の電極体の接合方法は、超音波溶接機を用いて超音波振動を付与することが好ましい。すなわち、従来の超音波溶接機を用いて電極体と電流取り出し端子とを一体的に接合することができる。
【００２８】
本発明の電池の電極体の接合方法は、超音波振動を付与するときに、緩衝板を介して超音波振動を付与することが好ましい。この緩衝板を配置することで、電極体への直接的なダメージを低減する。すなわち、緩衝板を配置せずに、電極体に超音波振動を付与すると、超音波振動を付与する超音波溶接機のホーンが食い込み、電極体に過剰なストレスがかかり、電極体を構成するシート状部材に切断が生じたり、電極体を構成するシート状部材の各層同士の接合にばらつきが生じ、溶接品質が安定しなくなる。ここで、この緩衝板には、アルミ、銅、ニッケル、ステンレス鋼等よりなる部材を用いることが好ましい。すなわち、緩衝板が電極体と同種あるいは接合可能な材質により形成されることで、緩衝板と電極体を一体的に接合し、接続部の一部をなす構造とすることが可能となる。
【００２９】
本発明の電池の電極体の接合方法は、二次電池等に用いられる電極体において、電流取り出し端子を電極板に接合する接合方法に用いることが好ましい。すなわち、シート状部材として電極板を、被接合部材として電流取り出し端子を超音波振動方により接合することができる。
【００３０】
ここで、本発明の電池の電極体の接合方法を用いて電流取り出し端子を電極板の積層体に接合するときには、接合部には活物質が塗布されていないことが好ましい。
【００３１】
電極体と電流取り出し端子との接続に本発明の電池の電極体の接合方法を用いると、電極体と取り出し端子との接合面積を広くできるため、電極板の積層体から大電流を取り出せることができるようになる。このため、本発明の接合方法を用いた電極体を有する電池は、電池性能が向上する。
【００３２】
【実施例】
以下、実施例を用いて本発明を説明する。
【００３３】
（実施例）
実施例として、本発明の積層体の接合方法を用いて、角形電池に用いられる巻回型電極体と、電極体から電流を取り出す電流取り出し端子と、を接合した。この巻回型電極体１と電流取り出し端子２との接合体を図１および図２に示した。図１はこの接合体を巻回型電極体１の電流取り出し端子２の接合されていない方向から、図２はこの接合体を巻回型電極体１の軸方向から示した図である。
【００３４】
巻回型電極体１は、図３に示されるように、セパレータを介した正極板１１と負極板１２とからなる電極板が巻回して形成された電極体である。ここで、正極板１１には厚さが１５μｍのアルミニウムシートの表面に正極活物質が付与されたシート状正極が、負極板１２には厚さが１０μｍの銅シートの表面に負極活物質が付与されたシート状負極が、用いられた。なお、以降において、正極での具体例を用いて本実施例を説明する。
【００３５】
なお、この巻回型電極体１は、電流取り出し端子２が接合される接合部は、その厚さ方向における電極板に電極反応を生じさせる活物質が塗布されていない未塗布部がもうけられ、正極シートにおいては、アルミニウムシートが露出するように形成されている。このため、接合部においては、アルミニウムシートが４８枚積層され、その厚さが０．７ｍｍとなっている。
【００３６】
接合部は、巻回型電極体１の周方向にもうけられている。具体的には、巻回型電極体１を形成するときに、図３に示されるように、正極板１１および負極板１２をお互いに軸方向にずらして巻回させ、お互いの端面から突出した部分を活物質未塗布部１１１、１２１とすることで、接合部が形成される。
【００３７】
電流取り出し端子２は、図４に示されるように、一方の端部側が平らな巻回型電極体との接合面２１になるように半円形状の断面を有する棒状部材であり、さらに、この接合面２１に突起２２が形成されている。また、この電流取り出し端子２において、接合面２１とならない他方の端部は、電池を組み立てたときに外部端子となるようになっている。ここで、この電流取り出し端子２は、正極側がアルミニウムで、負極側が銅で形成されている。なお、接合面２１に形成された突起２２は、底辺の一辺が１．４ｍｍで、突出高さが０．７ｍｍの四角錐形状となるようにもうけられている。なお、この突起２２は、電流取り出し端子２１の接合面２１に二個軸方向にならんでもうけられている。
【００３８】
巻回型電極体１と電流取り出し端子２との接合は、この巻回型電極体１の接合部に、電流取り出し端子２の突起２２が当接するように重ね合わせ、超音波振動を付与することによりなされた。
【００３９】
ここで、この超音波接合における接合過程を図５に示した。
【００４０】
超音波振動の付与は、通常の超音波接合法を用いた超音波溶接機を用いてなされた。超音波接合は、まず、超音波溶接機のアンビル７１上に電流取り出し端子２を突起２２が鉛直上方に向かって突出するように配置し、この電流取り出し端子２の巻回型電極体１との接合面２１に、巻回型電極体１の接合部を重ね合わせた。つづいて、この巻回型電極体１と電流取り出し端子２を重ね合わせた上に、さらに、厚さが０．３ｍｍのアルミニウム板よりなる緩衝板４を配置した。この電流取り出し端子２、巻回型電極体１および緩衝板４を重ね合わせた状態で、超音波溶接機のホーン７２により超音波振動を付与した。ここで、振動条件は、振幅が４２μｍであり、振動時間は３秒であった。
【００４１】
超音波接合は、アンビル７１上の電流取りだし端子２と巻回型電極体１に緩衝板４を配置した状態で、超音波溶接機のホーン７２を振動させ、この振動を所定の時間、繰り返した。
【００４２】
このとき、振動が付与されることにより、突起２２の頂点２３において、巻回型電極体１との接触面積が小さくなったことによる加圧力が増大される工作効果により、巻回型電極体１を構成する電極板および電流取り出し端子２の表面に形成されていた酸化被膜が除去され、清浄なアルミニウム表面が現れる。この清浄な表面において原子の移動、拡散が生じるようになる。この移動、拡散により電極板同士および巻回型電極体１と電流取り出し端子２が接合する。
【００４３】
（評価）
本実施例の巻回型電極体１と電流取り出し端子２との接合の評価は、接合部における外観および断面を観察することによりなされた。この外観および断面の写真を図６および図７に示した。
【００４４】
図６および図７より、本実施例の巻回型電極体１と電流取り出し端子２との接合部は、巻回型電極体１を構成する電極板および緩衝板４に破れ、割れは見られず、超音波振動を付与するときに電極板に余計なストレスがかかっていないことがわかった。さらに、電流取り出し端子２、電極板、緩衝板４のそれぞれの界面においても、接合が不十分なことによる浮き、剥離が見られず、一体的に固相接合していることがわかった。
【００４５】
（角型電池）
本実施例において電流取り出し端子２が接合され巻回型電極体１を用いて、角型形状電池を作製した。この角型形状電池を図８に示した。この角型形状電池は、取り出し端子２を接合した巻回型電極体１を、電解液とともに角型電池容器３に挿入、固定して、角型形状電池が得られた。なお、この角型形状電池は、巻回型電極体１に接合された電流取り出し端子２の接合されていない他端部が、角型電池容器３から突出してこの電池の外部端子となっている。
【００４６】
この角型形状電池に用いられた活物質は、通常の電池に用いられるものであり、正極活物質にはリチウムマンガン酸化物が、負極活物質にはカーボンが、また、セパレータにはポリエチレン製シートが用いられた。
【００４７】
（比較例）
本発明の比較例として、接合面に突起がもうけられていない電流取り出し端子と、電極体との超音波接合を行った。
【００４８】
本比較例は、接合部に突起がない電流取り出し端子を用いた以外は実施例と同様の条件で超音波接合を行った。この超音波接合における接合過程を図９に示した。
【００４９】
アンビル７１上の電流取り出し端子２と巻回型電極体１に緩衝板４を配置した状態で、超音波溶接機のホーン７２を振動させ、これを繰り返す。
【００５０】
この比較例における接合状態を実施例と同様に評価したところ、巻回型電極体を構成する電極板同士の間に空隙が見られ、完全に一体化された接合状態が得られなかった。
【００５１】
さらに、この比較例において、巻回型電極体における電極板同士の接合を完全に行うために、振幅を５０μｍにまで大きくして超音波接合を行った。この振幅が５０μｍで接合を行った接合体においては、巻回型電極体の接合部を構成する電極板同士は一体化されたが、緩衝板の接合部周辺に割れが発生するとともに、電極板が数枚やぶれていた。
【００５２】
このため、本実施例の接合方法は、突起を有することで超音波接合時に要求される振幅のエネルギーを低減させることができるとともに、電極板にストレスを与えることなく電流取り出し端子を接合することができる。
【００５３】
【発明の効果】
本発明の電池の電極体の接合方法は、電流取り出し端子の電極体との重ね合わせ部に突起部を有することで、従来よりも低い振動出力で接合できるようになったため、電極体を構成するシート状電極板に過剰なストレスがかかることが防止される。このため、電極体と電流取り出し端子とを接合する接合方法として有用となっている。
【図面の簡単な説明】
【図１】 実施例の巻回型電極体と電流取り出し端子との接合体の図である。
【図２】 実施例の巻回型電極体と電流取り出し端子との接合体の図である。
【図３】 実施例の巻回型電極体の図である。
【図４】 実施例の電流取り出し端子の図である。
【図５】 実施例の巻回型電極体と電流取り出し端子との接合過程を示した図である。
【図６】 実施例の巻回型電極体と電流取り出し端子の接合体における接合部の外観を示す写真図である。
【図７】 実施例の巻回型電極体と電流取り出し端子の接合体における接合部の断面を示す写真図である。
【図８】 実施例の接合体を用いた角型形状電池を示した図である。
【図９】 比較例の巻回型電極体と電流取り出し端子との接合過程を示した図である。
【符号の説明】
１…巻回型電極体 １１…正極板
１１１…正極活物質未塗布部 １２…負極板
１２１…負極活物質未塗布部 １３…セパレータ
２…電流取り出し端子 ２１…接合面
２２…突起 ３…角型電池容器
４…緩衝板
７１…アンビル ７２…ホーン[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for joining laminates in which a laminate in which sheet-like members are laminated and a member to be joined are joined by an ultrasonic joining method. In particular, the present invention relates to a joining method used for joining an electrode plate and a current extraction terminal in a battery.
[0002]
[Prior art]
In recent years, high performance is also demanded for batteries used for automobile batteries and the like. Specifically, higher output and higher energy density of automobile batteries are required, and examples of secondary batteries that satisfy these requirements include nickel hydrogen secondary batteries and lithium ion secondary batteries.
[0003]
Further, such a secondary battery has an electrode body in which a positive electrode and a negative electrode are arranged to face each other in a sealed battery case. In this secondary battery, an electrode reaction occurs between a positive electrode and a negative electrode arranged opposite to each other, and an electric current is taken out using an external terminal electrically connected to each of the positive electrode and the negative electrode. Furthermore, the electrode body is required to have a large electrode plate area in order to improve the current density of the battery, and the sheet-like positive electrode plate and the negative electrode plate are laminated or wound in a state of facing each other. It is an electrode body.
[0004]
Here, in the conventional small secondary battery, the connection between the electrode body composed of the positive electrode and the negative electrode and the external terminal is performed by joining a thin tab (one) provided on the electrode plate.
[0005]
However, in a battery that requires a large current, such as an automobile battery, a structure in which the current is efficiently extracted by increasing the number of tabs, or an uncoated portion of the active material on the electrode plate of the laminated or wound electrode body In addition, high performance is being promoted by a method such as joining the uncoated portions together directly to the terminals. In such high performance means, ultrasonic bonding is often used for connecting electrodes and terminals as a method for bonding a large area in a short time.
[0006]
However, in the ultrasonic bonding of the sheet-like electrode plate multilayer body and the current extraction terminal, the layers of the electrode plate and the current extraction terminal are bonded together, and the bonding is performed according to the increase in the number of electrode plates stacked. It was necessary to increase the output of the ultrasonic energy sometimes applied. However, when trying to satisfy the joining condition due to the conditions in the high output region, excessive stress is applied to the joint and the vicinity of the joint, and the sheet-like electrode plate constituting the electrode body is torn due to insufficient strength. Had the problem.
[0007]
In particular, in the case of a lithium ion secondary battery, aluminum and copper are generally used for the electrode plate and the current extraction terminal. However, since these materials are difficult to join, the sheet-like electrode plate is damaged. It was a difficult technique to obtain a perfect joined state without any problems.
[0008]
Thus, it has been difficult to integrally bond dissimilar members to a laminate having a structure in which sheet-like members are laminated.
[0009]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a joining method capable of joining the battery electrode body and the current extraction terminal without damaging the battery electrode body. To do.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present inventors have studied the ultrasonic bonding method. As a result, the current extraction terminal has a protrusion having the same thickness as the electrode body , and this protrusion is the electrode body of the battery. It was found that the above-mentioned problem can be solved by applying ultrasonic vibration in a state of being superimposed.
[0011]
That is, the battery electrode body joining method of the present invention provides ultrasonic vibration to the battery electrode body having a structure in which sheet-like electrode plates are laminated and the current extraction terminal superimposed on the electrode body, A battery electrode body joining method for joining sheet-like electrode plates of an electrode body and an electrode body and a current takeout terminal, wherein the current takeout terminal has a protruding portion protruding from an overlapping portion with the electrode body. The protruding portion has a height substantially the same as the thickness of the electrode body in the overlapped portion, and ultrasonic vibration is applied in a state where the protruding portion presses the electrode body.
[0012]
The battery electrode body joining method of the present invention includes a protrusion on the joint surface of the current extraction terminal with the electrode body to locally absorb and diffuse the ultrasonic amplitude energy in the ultrasonic joining method. We are trying to improve the efficiency of the sonic bonding process. For this reason, heat generation, tearing, and biting of the horn due to ultrasonic vibration are suppressed at the joint portion of the electrode body and in the vicinity of the joint portion, and high quality of the joint surface is achieved.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
The battery electrode body joining method of the present invention is a joining method in which an electrode body and a current extraction terminal having a protrusion are joined to each other by applying ultrasonic vibration in a superposed state.
[0014]
The battery electrode body joining method of the present invention is performed by an ultrasonic joining method in which ultrasonic vibration is applied in a state where the electrode body and the current extraction terminal are overlapped. In the ultrasonic bonding method, by applying ultrasonic vibration to the two members in contact, the contact surfaces vibrate relative to each other, and the energy of this vibration causes the atoms on each surface to move and diffuse. It is joined by doing.
[0015]
The electrode body of the battery has a structure in which sheet-like electrode plates are laminated .
[0016]
The current extraction terminal has a protruding portion that protrudes from the overlapping portion with the electrode body . By having this protrusion part, the ultrasonic amplitude energy provided at the time of ultrasonic joining can be provided locally, and a laminated body and a to-be-joined member are joined integrally.
[0017]
That is, when the current extraction terminal is overlapped with the electrode body , the protrusion provided on the current extraction terminal locally presses the electrode body . That is, the protruding portion presses the electrode body , the pressing area is reduced, and the pressure applied to pressurize the electrode body is increased.
[0018]
The electrode body is preferably formed by laminating or winding sheet-like electrode plates . That is, the electrode body should just have the structure where the sheet-like electrode board laminated | stacked in the junction part with an electric current extraction terminal . As such a structure, a laminated body and a wound body of sheet-like electrode plates can be given.
[0019]
The protrusion is preferably formed in a conical shape. In other words, the protrusion is formed in a conical shape that is narrowed toward the tip direction, so that the protrusion presses the electrode body locally at the overlapping portion. Here, the conical shape of the protrusion means a shape that is narrowed toward the tip direction, and is not only a cone or pyramid with a sharp tip, but also a truncated cone with a truncated tip of the cone or pyramid. The shape is also included.
[0020]
It is preferable that the protrusion has a height substantially the same as the thickness of the electrode body in the overlapped portion. That is, if the height of the protrusion is too low, local pressurization of the electrode body by the protrusion is insufficient, and if the height is high, the protrusion seems to damage the sheet-like electrode plate constituting the electrode body. become.
[0021]
The sheet-like electrode plate and the current extraction terminal constituting the electrode body preferably have a metal selected from aluminum, copper, nickel, and stainless steel as a main component. Here, having a metal selected from these metals as a main component indicates that pure metals of these metals and alloys having these components as main components can be used for sheet-like electrode plates and current extraction terminals . .
[0027]
In the battery electrode body joining method of the present invention, it is preferable to apply ultrasonic vibration using an ultrasonic welder. In other words, the electrode body and the current extraction terminal can be integrally joined using a conventional ultrasonic welding machine.
[0028]
In the method for joining the electrode bodies of the battery of the present invention, it is preferable to apply ultrasonic vibration through a buffer plate when applying ultrasonic vibration. By disposing this buffer plate, direct damage to the electrode body is reduced. That is, if ultrasonic vibration is applied to the electrode body without arranging a buffer plate, the horn of the ultrasonic welding machine that applies ultrasonic vibration bites into the electrode body, and excessive stress is applied to the electrode body , forming the electrode body. As a result, cutting occurs in the sheet-like member, or variations occur in the bonding between the layers of the sheet-like member constituting the electrode body , resulting in unstable welding quality. Here, a member made of aluminum, copper, nickel, stainless steel or the like is preferably used for the buffer plate. That is, the buffer plate is formed of the same kind as the electrode body or a material that can be joined, so that the buffer plate and the electrode body can be integrally joined to form a part of the connection portion.
[0029]
The electrode body joining method of the battery of the present invention is preferably used in a joining method for joining a current extraction terminal to an electrode plate in an electrode body used for a secondary battery or the like. That is, an electrode plate can be joined as a sheet-like member, and a current extraction terminal can be joined as a member to be joined by ultrasonic vibration.
[0030]
Here, when the current extraction terminal is joined to the laminate of the electrode plates using the joining method of the electrode body of the battery of the present invention, it is preferable that the active material is not applied to the joining portion.
[0031]
When the electrode body joining method of the battery of the present invention is used for connection between the electrode body and the current takeout terminal, the joining area between the electrode body and the takeout terminal can be widened, so that a large current can be taken out from the laminate of the electrode plates. become able to. For this reason, the battery performance which improves the battery which has an electrode body using the joining method of the present invention improves.
[0032]
【Example】
Hereinafter, the present invention will be described using examples.
[0033]
(Example)
As an example, a wound electrode body used for a rectangular battery and a current extraction terminal for taking out current from the electrode body were joined by using the laminate joining method of the present invention. The joined body of the wound electrode body 1 and the current extraction terminal 2 is shown in FIGS. FIG. 1 is a view showing the joined body from the direction in which the current extraction terminal 2 of the wound electrode body 1 is not joined, and FIG. 2 is a view showing the joined body from the axial direction of the wound electrode body 1.
[0034]
The wound electrode body 1 is an electrode body formed by winding an electrode plate composed of a positive electrode plate 11 and a negative electrode plate 12 with a separator interposed therebetween, as shown in FIG. Here, the positive electrode plate 11 is provided with a sheet-like positive electrode provided with a positive electrode active material on the surface of a 15 μm thick aluminum sheet, and the negative electrode plate 12 is provided with a negative electrode active material on the surface of a 10 μm thick copper sheet. A sheet-like negative electrode was used. In the following, this example will be described using a specific example of the positive electrode.
[0035]
In the wound electrode body 1, the joint portion to which the current extraction terminal 2 is joined is provided with an uncoated portion where an active material that causes an electrode reaction is not applied to the electrode plate in the thickness direction. The positive electrode sheet is formed so that the aluminum sheet is exposed. For this reason, 48 aluminum sheets are laminated | stacked in the junction part, and the thickness is 0.7 mm.
[0036]
The joint is provided in the circumferential direction of the wound electrode body 1. Specifically, when forming the wound electrode body 1, as shown in FIG. 3, the positive electrode plate 11 and the negative electrode plate 12 are wound while being shifted from each other in the axial direction, and protruded from the end surfaces of each other. A joint part is formed by making the part into the active material non-application parts 111 and 121.
[0037]
As shown in FIG. 4, the current extraction terminal 2 is a rod-like member having a semicircular cross section so that one end side becomes a joining surface 21 with a flat wound electrode body. A protrusion 22 is formed on the joint surface 21. Moreover, in this electric current extraction terminal 2, the other edge part which does not become the joint surface 21 becomes an external terminal when a battery is assembled. Here, the current extraction terminal 2 is formed of aluminum on the positive electrode side and copper on the negative electrode side. The protrusions 22 formed on the joint surface 21 are provided so as to have a quadrangular pyramid shape with one side of 1.4 mm and a protruding height of 0.7 mm. The protrusions 22 are provided on the joint surface 21 of the current extraction terminal 21 along two axial directions.
[0038]
The winding electrode body 1 and the current extraction terminal 2 are joined by superimposing the winding electrode body 1 so that the protrusion 22 of the current extraction terminal 2 is in contact with the joint portion of the winding electrode body 1 and applying ultrasonic vibration. Was made by.
[0039]
Here, the joining process in this ultrasonic joining is shown in FIG.
[0040]
Application of ultrasonic vibration was performed using an ultrasonic welding machine using a normal ultrasonic bonding method. In ultrasonic bonding, first, the current extraction terminal 2 is arranged on the anvil 71 of the ultrasonic welder so that the protrusion 22 protrudes vertically upward, and the current extraction terminal 2 is connected to the wound electrode body 1. The joint portion of the wound electrode body 1 was superimposed on the joint surface 21. Subsequently, after the wound electrode body 1 and the current extraction terminal 2 were overlapped, a buffer plate 4 made of an aluminum plate having a thickness of 0.3 mm was further disposed. In a state where the current extraction terminal 2, the wound electrode body 1, and the buffer plate 4 are superposed, ultrasonic vibration was applied by a horn 72 of an ultrasonic welding machine. Here, the vibration conditions were an amplitude of 42 μm and a vibration time of 3 seconds.
[0041]
In the ultrasonic bonding, the horn 72 of the ultrasonic welding machine is vibrated in a state where the buffer plate 4 is disposed on the current extraction terminal 2 and the wound electrode body 1 on the anvil 71, and this vibration is repeated for a predetermined time. .
[0042]
At this time, the winding electrode body 1 is applied due to a work effect in which the pressure applied by the contact area with the winding electrode body 1 is reduced at the apex 23 of the protrusion 22 by applying vibration. The oxide film formed on the surfaces of the electrode plate and the current extraction terminal 2 constituting the metal plate is removed, and a clean aluminum surface appears. The movement and diffusion of atoms occur on this clean surface. By this movement and diffusion, the electrode plates and the wound electrode body 1 and the current extraction terminal 2 are joined.
[0043]
(Evaluation)
The evaluation of the joining of the wound electrode body 1 and the current extraction terminal 2 of this example was made by observing the appearance and cross section of the joint. The appearance and a photograph of the cross section are shown in FIGS.
[0044]
From FIG. 6 and FIG. 7, the joint between the wound electrode body 1 and the current extraction terminal 2 of this example is broken by the electrode plate and the buffer plate 4 constituting the wound electrode body 1, and cracks are seen. In other words, it was found that no excessive stress was applied to the electrode plate when applying ultrasonic vibration. Further, it was found that even at each interface of the current extraction terminal 2, the electrode plate, and the buffer plate 4, no floating or peeling was observed due to insufficient bonding, and solid phase bonding was integrally performed.
[0045]
(Square battery)
In this example, the current extraction terminal 2 was joined, and a rectangular battery was manufactured using the wound electrode body 1. This rectangular battery is shown in FIG. In this rectangular battery, the wound electrode body 1 to which the takeout terminal 2 was joined was inserted and fixed together with the electrolytic solution into the rectangular battery container 3 to obtain a rectangular battery. In the square battery, the other end of the current extraction terminal 2 joined to the wound electrode body 1 is joined from the square battery container 3 to serve as an external terminal of the battery. .
[0046]
The active material used for this square battery is that used for ordinary batteries, lithium manganese oxide for the positive electrode active material, carbon for the negative electrode active material, and polyethylene sheet for the separator. Was used.
[0047]
(Comparative example)
As a comparative example of the present invention, ultrasonic bonding was performed between an electrode body and a current extraction terminal having no protrusion on the bonding surface.
[0048]
In this comparative example, ultrasonic bonding was performed under the same conditions as in the example except that a current extraction terminal having no protrusion at the bonding portion was used. The joining process in this ultrasonic joining is shown in FIG.
[0049]
In a state where the buffer plate 4 is disposed on the current extraction terminal 2 and the wound electrode body 1 on the anvil 71, the horn 72 of the ultrasonic welding machine is vibrated, and this is repeated.
[0050]
When the joined state in this comparative example was evaluated in the same manner as in the example, voids were observed between the electrode plates constituting the wound electrode body, and a completely integrated joined state was not obtained.
[0051]
Furthermore, in this comparative example, in order to completely join the electrode plates in the wound electrode body, ultrasonic joining was performed with the amplitude increased to 50 μm. In the joined body joined at this amplitude of 50 μm, the electrode plates constituting the joined part of the wound electrode body are integrated with each other, but cracks occur around the joined part of the buffer plate, and the electrode plate There were a few blurry.
[0052]
For this reason, the bonding method of this embodiment can reduce the energy of the amplitude required at the time of ultrasonic bonding by having the protrusion, and can bond the current extraction terminal without applying stress to the electrode plate. it can.
[0053]
【The invention's effect】
Joining method of a battery electrode of the present invention, by having a projection portion to the overlapping portion of the electrode body of the current leading terminals, because now be joined by conventionally lower vibration output, constituting the electrode member Excessive stress is prevented from being applied to the sheet electrode plate . For this reason, it is useful as a joining method for joining the electrode body and the current extraction terminal .
[Brief description of the drawings]
FIG. 1 is a diagram of a joined body of a wound electrode body and a current extraction terminal according to an embodiment.
FIG. 2 is a diagram of a joined body of a wound electrode body and a current extraction terminal of an example.
FIG. 3 is a view of a wound electrode body according to an example.
FIG. 4 is a diagram of a current extraction terminal according to an embodiment.
FIG. 5 is a view showing a joining process between the wound electrode body and the current extraction terminal of the example.
FIG. 6 is a photograph showing an appearance of a joint portion in a joined body of a wound electrode body and a current extraction terminal according to an example.
FIG. 7 is a photographic view showing a cross section of a joint portion in a joined body of a wound electrode body and a current extraction terminal of an example.
FIG. 8 is a view showing a prismatic battery using the joined body of Example.
FIG. 9 is a view showing a joining process of a wound electrode body and a current extraction terminal of a comparative example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Winding type electrode body 11 ... Positive electrode plate 111 ... Positive electrode active material non-application part 12 ... Negative electrode plate 121 ... Negative electrode active material non-application part 13 ... Separator 2 ... Current extraction terminal 21 ... Joining surface 22 ... Protrusion 3 ... Square type Battery container 4 ... Buffer plate 71 ... Anvil 72 ... Horn

Claims (5)

シート状電極板が積層した構造を有する電池の電極体と、該電極体に重ね合わされた電流取り出し端子と、に超音波振動を付与して、該電極体の該シート状電極板同士および該電極体と該電流取り出し端子とを接合させる電池の電極体の接合方法であって、Ultrasonic vibration is applied to an electrode body of a battery having a structure in which sheet-like electrode plates are laminated and a current extraction terminal superimposed on the electrode body, and the sheet-like electrode plates of the electrode body and the electrodes A battery electrode body joining method for joining a body and the current extraction terminal,
該電流取り出し端子は、該電極体との重ね合わせ部に突出した突起部を有し、該突起部は重ね合わされた部分の該電極体の厚さと略同一の高さを有し、該突起部が該電極体を押圧した状態で超音波振動が付与されることを特徴とする電池の電極体の接合方法。The current extraction terminal has a protruding portion that protrudes from the overlapping portion with the electrode body, and the protruding portion has a height substantially equal to the thickness of the electrode body at the overlapping portion, and the protruding portion A method for joining battery electrode bodies, wherein ultrasonic vibration is applied while pressing the electrode bodies. 前記電極体は、表面に正極活物質が付与されたシート状正極板、表面に負極活物質が付与されたシート状負極板を積層あるいは巻回して形成されている請求項The electrode body is formed by laminating or winding a sheet-like positive electrode plate provided with a positive electrode active material on a surface and a sheet-like negative electrode plate provided with a negative electrode active material on a surface. 11 記載の電池の電極体の接合方法。The joining method of the electrode body of description battery. 前記突起部は、錐状に形成された請求項1または 2 記載の電池の電極体の接合方法。 The protrusions, the bonding method according to claim 1 or 2 battery electrode assembly according formed conical. 前記電極体を構成する前記シート状部材および前記電流取り出し端子は、アルミ、銅、ニッケル、ステンレス鋼より選ばれる金属を主成分とする請求項The sheet-like member and the current extraction terminal constituting the electrode body are mainly composed of a metal selected from aluminum, copper, nickel, and stainless steel. 11 〜~ 3Three のいずれかEither 11 つに記載の電池の電極体の接合方法。The joining method of the electrode body of a battery as described in one. 前記電極体を構成する前記シート状正極板、前記シート状負極板には各前記活物質が塗布されていない未塗布部を有しており、前記電流取り出し端子は、該未塗布部の積層部分にて該電極体に接合されている請求項Each of the sheet-like positive electrode plate and the sheet-like negative electrode plate constituting the electrode body has an uncoated portion where the active material is not coated, and the current extraction terminal is a laminated portion of the uncoated portion. It is joined to the electrode body by 22 〜~ 4Four のいずれかEither 11 つに記載の電池の電極体の措合方法。A method for treating an electrode body of a battery according to claim 1.
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