JP2000231913A - Cylindrical battery - Google Patents
Cylindrical batteryInfo
- Publication number
- JP2000231913A JP2000231913A JP11033427A JP3342799A JP2000231913A JP 2000231913 A JP2000231913 A JP 2000231913A JP 11033427 A JP11033427 A JP 11033427A JP 3342799 A JP3342799 A JP 3342799A JP 2000231913 A JP2000231913 A JP 2000231913A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- current collecting
- battery
- collecting terminal
- electrode sheet
- 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
-
- 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
Landscapes
- Primary Cells (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シート状の電極が
捲回された電極体を筒型の電池缶に挿設して構成される
筒型電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical battery constituted by inserting an electrode body wound with a sheet-like electrode into a cylindrical battery can.
【０００２】[0002]
【従来の技術】パソコン、携帯電話等の小型化等に伴
い、高エネルギー密度の電池が要求され、情報関連機
器、通信機器等の分野では、リチウムイオン二次電池が
既に実用化され広く普及するに至っている。リチウムイ
オン二次電池のような二次電池は、一般に、起電反応の
素となる活物質を金属箔製の集電体表面に塗工した電極
を捲回して電極体を形成させ、この電極体を電解液とと
もに筒型（一般には円筒型）の電池缶内に収納して構成
されている。そして、このような電極を捲回した筒型電
池において、電極体から電池外部への集電方法として
は、集電体の一部に短冊状のリードを設け、このリード
の一端を外部へ通ずる端子に接合することによって行わ
れている。2. Description of the Related Art With the downsizing of personal computers and mobile phones, batteries with high energy density are required. In the fields of information-related equipment and communication equipment, lithium ion secondary batteries have already been put into practical use and have become widespread. Has been reached. A secondary battery such as a lithium ion secondary battery is generally formed by winding an electrode in which an active material serving as an element of an electromotive reaction is coated on a metal foil current collector surface to form an electrode body. The body is housed in a cylindrical (generally cylindrical) battery can together with the electrolytic solution. In a cylindrical battery in which such an electrode is wound, as a method of collecting power from the electrode body to the outside of the battery, a strip-shaped lead is provided on a part of the current collector, and one end of the lead is passed to the outside. This is done by bonding to terminals.
【０００３】近年、環境問題、資源問題から、電気自動
車の開発が急がれる中、高性能なリチウムイオン二次電
池を電気自動車用の電源に使用するといった試みもなさ
れ、二次電池の大容量化は一層進展するものと考えられ
る。上記のような電極を捲回してなる筒型電池の場合、
大容量化させるためには電極面積を増大化させることが
必要となる。ところが、電極面積を増大化させた場合、
電極の隅々から効率よく集電するためには、上記集電用
リードを１つの電極に数多く付設する必要があり、集電
のための機構を複雑化、煩雑化させることにつながる。
また、電池内に集電のためのスペースを多く必要とし、
電池の出力体積密度、エネルギ体積密度を小さくするも
のとなっていた。In recent years, development of electric vehicles has been rushed due to environmental problems and resource problems. Attempts have been made to use a high-performance lithium ion secondary battery as a power source for electric vehicles. It is thought that the progress will be further advanced. In the case of a cylindrical battery formed by winding electrodes as described above,
In order to increase the capacity, it is necessary to increase the electrode area. However, when the electrode area is increased,
In order to efficiently collect current from every corner of the electrode, it is necessary to attach a large number of the above-mentioned current collecting leads to one electrode, which leads to a complicated and complicated mechanism for current collection.
Also, it requires a lot of space for current collection in the battery,
The output volume density and energy volume density of the battery were reduced.
【０００４】従来、電極を捲回させた大型の筒型電池の
集電機構として、特開平９−９２３３５号公報、特開平
９−９２３３８号公報等に示すものがあった。これらに
示す集電処理の方式は、以下のようなものである。ま
ず、帯状の集電体の表面に幅方向の一端部に未塗工部を
残すようにして電極合材を塗工し、この未塗工部を切り
欠くことにより集電用リードを形成させたシート状の電
極を作成する（図１４参照）。次に、これらの電極を、
互いの集電用リードが背向するように位置させ、セパレ
ータを挟装させて、これらを捲回し、電極体を形成させ
る（図１５、図１６参照）。そして、円盤状のフランジ
部とネジを形成した外部端子部とからなる集電体を用
い、電極体の捲回端面に突出した集電用リードを、電極
体の捲回端面に配置させた集電端子のフランジ部の外周
に集め、これをリングを用いて押さえつけてレーザ溶接
する（図１７参照）、あるいは、集めた集電用リードを
フランジ部外周に押さえつけるように数箇所の超音波接
合を行う（図１８参照）。正極および負極とも上記集電
端子に集電した後、電極体を円筒型の電池缶に挿設し、
電池缶の缶底および電池缶蓋に設けられた端子孔から集
電端子の外部端子部を外部に突出させ、端子孔と集電端
子との間および電池缶と電池缶蓋との間を内部に注入す
る電解液が漏れないようにシールして、電池を密閉する
という方法である。Conventionally, as a current collecting mechanism of a large cylindrical battery having an electrode wound thereon, there has been one disclosed in JP-A-9-92335 and JP-A-9-92338. The methods of the power collection processing shown in these are as follows. First, an electrode mixture is applied so as to leave an uncoated portion at one end in the width direction on the surface of the belt-shaped current collector, and the uncoated portion is cut out to form a current collecting lead. A sheet-shaped electrode is formed (see FIG. 14). Next, these electrodes are
The current collecting leads are positioned so as to face each other, the separator is sandwiched therebetween, and these are wound to form an electrode body (see FIGS. 15 and 16). Then, using a current collector consisting of a disk-shaped flange portion and an external terminal portion formed with a screw, a current collecting lead projecting from the wound end surface of the electrode body is disposed on the wound end surface of the electrode body. The terminals are collected on the outer periphery of the flange portion of the current terminal and pressed with a ring to perform laser welding (see FIG. 17). Alternatively, several ultrasonic bondings are performed so that the collected current collecting leads are pressed against the outer periphery of the flange portion. (See FIG. 18). After both the positive electrode and the negative electrode collect current at the current collecting terminal, the electrode body is inserted into a cylindrical battery can,
The external terminal of the current collector terminal protrudes outside from the terminal hole provided on the bottom of the battery can and the lid of the battery can, and the inside of the space between the terminal hole and the current collector terminal and between the battery can and the battery can lid is opened. This is a method of sealing the battery so that the electrolyte injected into the battery does not leak, thereby sealing the battery.
【０００５】なお、集電用リードの形成については、上
記の切り欠きによるものの他、未塗工部に短冊状の金属
箔を超音波接合、抵抗溶接等の手段を用いて接合するこ
とにより形成する方法でも行われていた（図１９参
照）。[0005] The current collecting lead is formed by joining a strip-shaped metal foil to an uncoated portion by means of ultrasonic bonding, resistance welding or the like, in addition to the above-mentioned notch. (See FIG. 19).
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記従
来の方法は、以下の欠点があった。 （１）電極合材塗工後、未塗工部を短冊状にカットし
て、あるいは未塗工部に短冊状の金属箔を接合すること
により、集電用リードを複数形成させなければならず、
この工程に多くの工数を必要とし、電池の製造コストが
上昇する。However, the above conventional method has the following disadvantages. (1) After coating the electrode mixture, a plurality of current collecting leads must be formed by cutting a strip-shaped uncoated portion or joining a strip-shaped metal foil to the uncoated portion. Without
This process requires many man-hours, and increases the battery manufacturing cost.
【０００７】（２）リングを用いてレーザ溶接する場合
は、リングにより押さえつける工程を必要とし、またレ
ーザ溶接を行うためにリングおよびフランジ部からはみ
出た集電用リードを切りそろえる工程をも必要とし、や
はり製造コストの増加につながる。さらにレーザ溶接は
スパッタが発生し、このスパッタが電極体に入り込むこ
とによって電極間の短絡の原因となる可能性がある。(2) In the case of laser welding using a ring, a step of pressing with a ring is required, and a step of trimming current collecting leads protruding from the ring and the flange in order to perform laser welding is also required. Again, this leads to an increase in manufacturing costs. Further, in laser welding, spatter is generated, and this spatter may enter the electrode body and cause a short circuit between the electrodes.
【０００８】（３）超音波接合する場合は、リング等の
押え金具を用いないため、複数のバラバラに集まってく
る集電用リードがスプリングバックにより元に戻ろうと
するため、これをうまく捌いて超音波接合を行うのは非
常に作業性が悪く、やはり多くの工数を必要とし製造コ
ストが増加してしまう。 （４）レーザ溶接、超音波接合のいずれの方法であって
も、大きなフランジ部を有する円盤状の集電端子を必要
とするため、集電端子の重量が大きく、電池自体の重量
も増加し、電池の重要な特性である出力重量密度、エネ
ルギ重量密度が減少してしまうことになる。[0008] (3) In the case of ultrasonic bonding, since a holding member such as a ring is not used, a plurality of current collecting leads which are gathered apart tend to return to the original state by springback, and this is properly handled. Performing ultrasonic bonding is very poor in workability, and also requires a lot of man-hours, thus increasing manufacturing costs. (4) Regardless of the method of laser welding or ultrasonic bonding, since a disk-shaped current collecting terminal having a large flange is required, the weight of the current collecting terminal is large, and the weight of the battery itself is also increased. Therefore, the output weight density and the energy weight density, which are important characteristics of the battery, are reduced.
【０００９】（５）集電端子自体はある程度小型とする
ことができ、電池内部に集電処理のためのスペースは比
較的小さくできるものの、正極側、負極側とも外部端子
が電池缶および電池缶蓋から長く突出する構造のため、
組電池として使用する場合には、電池ユニット自体の出
力体積密度、エネルギ体積密度をも減少させる。 （６）正極側、負極側の集電端子のいずれもが、電池缶
底あるいは電池缶蓋に設けられた端子孔から外部端子部
が突出する構造となっていることから、電解液の漏洩の
危険性のある箇所が多い構造となっている。したがっ
て、電池の密閉性を保つために、集電端子と電池缶およ
び電池缶蓋との間にもシール材等を必要とし、部品点数
の増大、電池密閉に対する作業工数の増大につながるも
のとなる。(5) The current collecting terminal itself can be made small to some extent, and the space for the current collecting process inside the battery can be made relatively small. Because of the structure that protrudes long from the lid,
When used as an assembled battery, the output volume density and energy volume density of the battery unit itself are also reduced. (6) Since both of the current collecting terminals on the positive electrode side and the negative electrode side have a structure in which the external terminal portions protrude from the terminal holes provided in the bottom of the battery can or the lid of the battery can, leakage of the electrolyte can be prevented. It has a structure with many dangerous places. Therefore, in order to maintain the sealing property of the battery, a sealing material or the like is also required between the current collecting terminal and the battery can and the battery can lid, which leads to an increase in the number of parts and an increase in the number of steps for sealing the battery. .
【００１０】（７）集電端子の外部端子部がネジ構造と
なっているため、回り止めのための機構をも必要とし、
さらなる部品点数の増大、集電端子の電池缶および電池
缶蓋への付設作業工数の増大等が発生するものとなる。 本発明は、電極を捲回して構成される筒型電池におい
て、従来の集電処理機構が抱える上記実情に鑑みてなさ
れたものであり、電解液漏洩の危険性のある箇所を減少
させ、集電処理に多くの工数を必要とせず、また大きな
重量および体積の端子部品を必要としない集電処理方法
を開発することを課題とし、密閉性に優れ、集電処理の
ためのコストが安く、かつ出力密度、エネルギ密度の高
い筒型電池を提供することを目的としている。(7) Since the external terminal portion of the current collecting terminal has a screw structure, a mechanism for preventing rotation is also required.
This further increases the number of parts, increases the number of steps for attaching the current collecting terminal to the battery can and the battery can lid, and the like. The present invention has been made in view of the above-described circumstances of a conventional current collection processing mechanism in a cylindrical battery formed by winding electrodes, and reduces the risk of electrolyte leakage, thereby reducing It is an object of the present invention to develop a current collection method that does not require many man-hours for electric processing and does not require large weight and volume of terminal components, and has excellent sealing properties, low cost for current collection processing, It is another object of the present invention to provide a cylindrical battery having high output density and high energy density.
【００１１】[0011]
【課題を解決するための手段】本発明の筒型電池は、正
極または負極のいずれか一方の外部端子を兼ねる有底の
筒型電池缶と、それぞれの金属箔集電体とその表面に形
成されたそれぞれの電極合材層とからなる帯状の正極シ
ートおよび負極シートの２つの電極シートをロール状に
捲回して形成され、捲回中心軸が前記電池缶の底部の内
壁面に対して概直角になるように該電池缶内部に挿設さ
れた電極体と、前記２つの電極シートのうちの一方の電
極シートから集電しかつ前記電池缶に通電させる集電端
子とを備えてなる筒型電池であって、前記集電端子に集
電される前記一方の電極シートは、幅方向の一端部に全
長にわたる電極合材層未形成部を有し、前記電極体は、
前記一方の電極シートの前記電極合材層未形成部を他方
の電極シートから突出させるように前記２つの電極シー
トを捲回しかつ捲回中心に中空部を有するように形成さ
れ、かつ、該一方の電極シートの電極合材層未形成部が
前記電池缶の底部側に位置するように該電池缶に挿設さ
れており、前記集電端子は、前記電極体の中空部の前記
一方の電極シートの電極合材層未形成部に対向する位置
にその１の端面が前記電池缶の底部内壁面に接するよう
に挿設されており、前記一方の電極シートの電極合材層
未形成部は、その少なくとも一部が前記集電端子の外側
面に重ね合わさるように接合され、かつ、前記集電端子
の前記１の端面は、前記電池缶の底部内壁面に接合され
ていることを特徴とする。SUMMARY OF THE INVENTION A cylindrical battery according to the present invention has a bottomed cylindrical battery can serving also as an external terminal of either a positive electrode or a negative electrode, and a metal foil current collector formed on the surface thereof. The two electrode sheets of a strip-shaped positive electrode sheet and a negative electrode sheet comprising the respective electrode mixture layers thus formed are wound in a roll shape, and the center axis of the winding is approximately with respect to the inner wall surface at the bottom of the battery can. A tube comprising: an electrode body inserted into the battery can at a right angle; and a current collecting terminal for collecting current from one of the two electrode sheets and supplying current to the battery can. In the type battery, the one electrode sheet to be collected by the current collecting terminal has an electrode mixture layer unformed portion over the entire length at one end in the width direction, and the electrode body is
The two electrode sheets are wound so as to protrude the electrode mixture layer-unformed portion of the one electrode sheet from the other electrode sheet, and are formed so as to have a hollow portion at the center of the winding, and The electrode sheet of the electrode sheet is not inserted in the battery can so that the portion where the electrode mixture layer is not formed is located on the bottom side of the battery can, and the current collecting terminal is connected to the one electrode of the hollow portion of the electrode body. The one end face is inserted at a position facing the electrode mixture layer-free portion of the sheet so as to be in contact with the bottom inner wall surface of the battery can, and the electrode mixture-layer-free portion of the one electrode sheet is And at least a part thereof is joined so as to overlap with an outer surface of the current collecting terminal, and the first end surface of the current collecting terminal is joined to a bottom inner wall surface of the battery can. I do.
【００１２】つまり本発明の筒型電池では、正極シート
または負極シートのいずれか一方の電極シートを、電極
合材層が形成されていない電極合材層未形成部に、切り
欠くことによって若しくは短冊状のものを接合すること
によって集電用リードを形成させるといった特別な手段
を施すことなく、この電極合材層未形成部を集電端子
に、単に、重ね合わせるように接合することにより、集
電処理に必要となる工数を大幅に削減することが可能と
なる。また、従来のような比較的大型でかつ重量のある
集電端子部品を必要とせず、集電処理のためのスペース
および電池重量の減少を図ることができる。さらに本発
明の筒型電池では、この比較的小型の集電端子の端部
を、正極または負極の外部端子を兼ねる電池缶の缶底部
に、直接接合させることで、電解液の漏洩の危険性のあ
る箇所を減少させて密閉性を高めるとともに、集電端子
と外部端子（この場合は電池缶）との導通処理のための
作業工数を大幅に減少させることを可能にしている。さ
らにまた、底部に外部端子が突出しないため組電池とし
て使用した場合でも、出力体積密度、エネルギ体積密度
の高い組電池を構成することができる。That is, in the cylindrical battery of the present invention, one of the positive electrode sheet and the negative electrode sheet is cut or cut in a portion where the electrode mixture layer is not formed, where the electrode mixture layer is not formed. By simply joining the non-formed portion of the electrode mixture layer to the current collecting terminal without using any special means such as forming a current collecting lead by joining the shape of the current collecting terminal, the current collecting terminal is formed by simply overlapping the current collecting terminal. The man-hour required for the electric treatment can be greatly reduced. In addition, a relatively large and heavy current collecting terminal component as in the related art is not required, and the space for the current collecting process and the weight of the battery can be reduced. Furthermore, in the cylindrical battery of the present invention, the end of the relatively small current collecting terminal is directly joined to the bottom of the battery can, which also serves as the external terminal of the positive electrode or the negative electrode, thereby reducing the risk of electrolyte leakage. In addition to improving the hermeticity by reducing the locations where there is, it is possible to greatly reduce the number of work steps for conducting the conduction between the current collecting terminal and the external terminal (in this case, the battery can). Furthermore, since the external terminals do not protrude from the bottom, even when used as an assembled battery, an assembled battery having a high output volume density and energy volume density can be configured.
【００１３】また、本発明の筒型電池では、他方の極の
集電方式についても、以下の方式を採用することができ
る。つまり本発明の筒型電池は、前記他方の電極シート
から集電するもう１つの集電端子を備え、前記他方の電
極シートは、前記一方の電極シートの前記電極合材層未
形成部に背向する幅方向の一端部に全長にわたる電極合
材層未形成部を有し、前記電極体は、前記他方の電極シ
ートの前記電極合材層未形成部を前記一方の電極シート
から突出させるように前記２つの電極シートを捲回して
形成されており、前記もう１つの集電端子は、前記電極
体の中空部の前記他方の電極シートの電極合材層未形成
部に対向する位置に挿設されており、前記他方の電極シ
ートの電極合材層未形成部は、その少なくとも一部が前
記もう１つの集電端子の外側面に重ね合わさるように接
合されているように構成することができる。Further, in the cylindrical battery of the present invention, the following method can be adopted as the current collecting method of the other electrode. That is, the cylindrical battery of the present invention is provided with another current collecting terminal for collecting current from the other electrode sheet, and the other electrode sheet is provided on a portion of the one electrode sheet where the electrode mixture layer is not formed. At one end in the opposite width direction, an electrode mixture layer-unformed portion over the entire length is provided, and the electrode body causes the electrode mixture layer-unformed portion of the other electrode sheet to protrude from the one electrode sheet. And the other current collecting terminal is inserted into a hollow portion of the electrode body at a position facing a portion of the other electrode sheet on which the electrode mixture layer is not formed. The electrode mixture layer-free portion of the other electrode sheet may be configured so that at least a part thereof is joined so as to overlap the outer surface of the another current collecting terminal. it can.
【００１４】このように、他方の極にも比較的小型の集
電端子を採用し、前記一方の極と同様に、電極合材層未
形成部を集電端子に重ね合わせるように接合することに
より、集電処理工数のさらなる削減と、集電処理のため
のスペースおよび電池重量のさらなる減少を図ることが
できる。また、前記もう一つの集電端子から、電池缶を
密閉する電池缶蓋の内壁面までリードにて導通させる手
段を併合させれば、さらに密閉性に優れ、出力密度、エ
ネルギ密度の高い筒型電池を構成することができる。As described above, a relatively small current collecting terminal is also used for the other electrode, and the electrode mixture layer non-formed portion is joined to the current collecting terminal so as to overlap with the current collecting terminal as in the case of the one electrode. Accordingly, it is possible to further reduce the number of steps of the power collection processing, and further reduce the space for the power collection processing and the battery weight. Also, if means for conducting the lead from the other current collecting terminal to the inner wall surface of the battery can lid that seals the battery can is combined, a more excellent sealing performance, and a cylindrical type having a high output density and a high energy density. A battery can be configured.
【００１５】[0015]
【発明の実施の形態】以下に、円筒型リチウムイオン二
次電池を例にとって、図面をも参照しつつ、本発明の筒
型電池の実施形態を詳しく説明する。ただし、本発明の
筒型電池は、結して以下の実施形態に限定されるもので
はない。例えば、円筒型に限定されるものではなく、横
断面が楕円形、偏平楕円形、方形あるいは多角形をなす
筒型の電池にも適用できる。また、リチウムイオン二次
電池に限られず、金属箔製集電体の表面に活物質を含む
電極合材を層状に形成した電極シートを捲回する形式の
電池（二次電池に限られない）であればよく、例えばニ
ッケル水素電池等にも適用できる。なお、電気二重層キ
ャパシタにも適用できるため、本明細書中、電池とは広
義に解釈するものとする。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a cylindrical battery of the present invention will be described in detail with reference to the drawings, taking a cylindrical lithium ion secondary battery as an example. However, the tubular battery of the present invention is not limited to the following embodiments. For example, the present invention is not limited to a cylindrical battery, and can be applied to a cylindrical battery having a cross section of an ellipse, a flat ellipse, a square, or a polygon. In addition, the battery is not limited to the lithium ion secondary battery, and is a type of winding an electrode sheet in which an electrode mixture containing an active material is formed in a layer on the surface of a metal foil current collector (not limited to a secondary battery). The present invention can be applied to, for example, a nickel-metal hydride battery. Note that, in this specification, a battery is to be interpreted in a broad sense because it can be applied to an electric double layer capacitor.
【００１６】〈円筒型リチウムイオン二次電池の構成概
要〉図１に、本発明の筒型電池の代表的な実施形態であ
る円筒型リチウムイオン二次電池の内部構造を示す。本
円筒型リチウムイオン二次電池は負極の外部端子を兼ね
る有底の円筒型電池缶６０と、それぞれの金属箔集電体
とその表面に形成されたそれぞれの電極合材層とをもつ
帯状の正極シート１０および負極シート２０をセパレー
タ３０を介してロール状に捲回して形成され、捲回中心
軸が電池缶６０の底部６１の内壁面に対して直角になる
ように電池缶６０内部に挿設された電極体４０と、負極
シート２０から集電しかつ電池缶６０に通電させる集電
端子（以下、「底部集電端子」という）５０と、正極シ
ート１０から集電するもう１つの集電端子（以下、「頂
部集電端子」という）５５とを主要構成要素としてい
る。そしてその他に、外部端子となる突出部６６を有
し、電池缶６０を密閉する電池缶蓋６５と、正負極間の
絶縁および電池の密閉を担保するためのガスケット７１
と、電池缶蓋６５と頂部集電端子５５とを導通させるた
めの頂部集電用リード７２と、電池内部に注入された非
水電解液とを構成要素としている。<Outline of Configuration of Cylindrical Lithium Ion Secondary Battery> FIG. 1 shows the internal structure of a cylindrical lithium ion secondary battery which is a typical embodiment of the cylindrical battery of the present invention. This cylindrical lithium ion secondary battery has a band shape having a bottomed cylindrical battery can 60 also serving as an external terminal of a negative electrode, each metal foil current collector and each electrode mixture layer formed on the surface thereof. The positive electrode sheet 10 and the negative electrode sheet 20 are formed by being wound in a roll shape with the separator 30 interposed therebetween, and inserted into the battery can 60 so that the center axis of the winding is perpendicular to the inner wall surface of the bottom 61 of the battery can 60. A current collecting terminal (hereinafter, referred to as a “bottom current collecting terminal”) 50 for collecting current from the negative electrode sheet 20 and energizing the battery can 60, and another current collecting terminal for collecting current from the positive electrode sheet 10. And a power terminal (hereinafter referred to as a “top current collecting terminal”) 55 as a main component. In addition, a battery can lid 65 having a projecting portion 66 serving as an external terminal and sealing the battery can 60, and a gasket 71 for ensuring insulation between the positive and negative electrodes and sealing of the battery are provided.
And a top current collecting lead 72 for making the battery can lid 65 and the top current collecting terminal 55 conductive, and a non-aqueous electrolyte injected into the battery.
【００１７】後に詳しく説明するが、正極シート１０お
よび負極シート２０は、幅方向の一端部に全長にわたる
正極合材層未形成部１３および負極合材層未形成部２３
を有している。そして、電極体４０は、正極合材層未形
成部１３および負極合材層未形成部２３を他方の電極シ
ートから突出させるようにして、正極シート１０および
負極シート２０をセパレータ３０を介して捲回しかつ捲
回中心に中空部４１を有するように形成されている。な
お、本実施形態の筒型電池の場合、電極体４０の電池缶
６０への挿設は、負極シート２０の負極合材層未形成部
２３が電池缶６０の底部側に位置するようになされてい
る。As will be described in detail later, the positive electrode sheet 10 and the negative electrode sheet 20 are provided at one end in the width direction with a positive electrode mixture material layer-free portion 13 and a negative electrode material layer-free portion 23 extending over the entire length.
have. Then, the electrode body 40 winds the positive electrode sheet 10 and the negative electrode sheet 20 via the separator 30 so that the positive electrode mixture layer non-formed portion 13 and the negative electrode mixture layer non-formed portion 23 project from the other electrode sheet. It is formed so as to have a hollow portion 41 at the center of the winding and winding. In the case of the cylindrical battery according to the present embodiment, the electrode body 40 is inserted into the battery can 60 such that the negative electrode mixture layer non-formed portion 23 of the negative electrode sheet 20 is located on the bottom side of the battery can 60. ing.
【００１８】底部集電端子５０は、中空部５２を有する
丸パイプ形状をしており、下端部が閉塞されていること
で下端面５３を有するものとなっている。底部集電端子
５０は、電極体４０の中空部４１であって負極シート２
０の負極合材層未形成部２３に対向する位置に、下端面
５３が電池缶６０の底部６１の内壁面に接するように挿
設されている。そして負極合材層未形成部２３は、底部
集電端子５０の外側面５１であって円周状の２等分の位
置に、超音波接合により、重ね合わさるように接合され
ている。また、底部集電端子５０の下端面５３は、電池
缶６０の底部６１の内壁面に、抵抗溶接によって接合さ
れている。The bottom current collecting terminal 50 has a round pipe shape having a hollow portion 52, and has a lower end surface 53 because the lower end portion is closed. The bottom current collecting terminal 50 is the hollow portion 41 of the electrode body 40 and the negative electrode sheet 2.
The lower end surface 53 is inserted at a position facing the negative electrode mixture layer-free portion 23 of the battery can 60 so as to be in contact with the inner wall surface of the bottom portion 61 of the battery can 60. The negative-electrode-mixture-layer-free portion 23 is joined to the outer side surface 51 of the bottom current collecting terminal 50 at a circumferentially equal position by ultrasonic joining so as to be superposed. The lower end surface 53 of the bottom current collecting terminal 50 is joined to the inner wall surface of the bottom 61 of the battery can 60 by resistance welding.
【００１９】また、頂部集電端子５５も、底部集電端子
５０と同様、中空部５７を有する丸パイプ形状をしてい
る。頂部集電端子５５は、電極体４０の中空部４１であ
って正極シート１０の正極合材層未形成部１３に対向す
る位置に挿設されている。そして正極合材層未形成部１
３は、負極合材層未形成部２３と同様、頂部集電端子５
５の外側面５６であって円周状の２等分の位置に、超音
波接合により、重ね合わさるように接合されている。な
お、頂部集電端子５５と正極外部端子となる電池缶蓋６
５との通電は、１つの頂部集電用リード７２を用い、こ
の頂部集電用リード７２の両端を頂部集電端子５５と電
池缶蓋６５にそれぞれ超音波接合することによってなさ
れている。The top current collecting terminal 55 also has a round pipe shape having a hollow portion 57, like the bottom current collecting terminal 50. The top current collecting terminal 55 is inserted into the hollow portion 41 of the electrode body 40 at a position facing the positive electrode mixture layer non-formed portion 13 of the positive electrode sheet 10. Then, the positive electrode mixture layer non-formed portion 1
Reference numeral 3 denotes a top current collecting terminal 5 like the negative electrode mixture layer-free portion 23.
The outer surface 56 of the fifth member 5 is joined so as to be superposed on a circumferentially equal position by ultrasonic bonding. The top current collecting terminal 55 and the battery can lid 6 serving as a positive electrode external terminal are provided.
The connection with 5 is performed by using one top current collecting lead 72 and ultrasonically joining both ends of the top current collecting lead 72 to the top current collecting terminal 55 and the battery can lid 65, respectively.
【００２０】以下に、それそれの構成要素について、本
発明の筒型電池の製造方法および変形実施形態を交えな
がら、さらに詳しく説明する。 〈電極シート〉図２に、本実施形態の筒型電池を構成す
る正極シートおよび負極シートの平面図を表す。正極シ
ート１０は、帯状金属箔製の正極集電体１１とその表面
に形成された正極合材層１２とからなり、負極シート２
０は帯状金属箔製の負極集電体２１とその表面に形成さ
れた負極合材層２２とからなる。正極シート１０および
負極シート２０の長さおよび幅については、作成しよう
とする電池の容量等に応じて任意のものとすることがで
きる。Hereinafter, each component will be described in more detail with reference to a method of manufacturing a cylindrical battery and a modified embodiment of the present invention. <Electrode Sheet> FIG. 2 is a plan view of a positive electrode sheet and a negative electrode sheet constituting the cylindrical battery of the present embodiment. The positive electrode sheet 10 includes a positive electrode current collector 11 made of a strip-shaped metal foil and a positive electrode mixture layer 12 formed on the surface thereof.
Reference numeral 0 denotes a negative electrode current collector 21 made of a band-shaped metal foil and a negative electrode mixture layer 22 formed on the surface thereof. The length and width of the positive electrode sheet 10 and the negative electrode sheet 20 can be arbitrarily set according to the capacity of the battery to be produced.
【００２１】正極シート１０、負極シート２０とも、幅
方向の一端部に所定幅で全長にわたって正極合材層未形
成部１３および負極合材層未形成部２３がそれぞれ設け
られている。本発明の筒型電池では、この電極合材層未
形成部１３、２３に何ら特別な加工を必要としないこに
特徴がある。つまり、従来技術（図１４、図１９参照）
とは異なり、電極シート１０、２０に複数の集電用リー
ドを設けることを必要としない。したがって、集電処理
作業の迅速化が図れることとなる。Both the positive electrode sheet 10 and the negative electrode sheet 20 are provided with a positive electrode mixture layer-free portion 13 and a negative electrode mixture layer-free portion 23 at one end in the width direction with a predetermined width over the entire length. The cylindrical battery of the present invention is characterized in that no special processing is required for the electrode-mixture-layer-free portions 13 and 23. That is, the prior art (see FIGS. 14 and 19)
Unlike this, it is not necessary to provide a plurality of current collecting leads on the electrode sheets 10 and 20. Therefore, the power collection processing work can be speeded up.
【００２２】電極合材層未形成部１３、２３の幅は、底
部集電端子５０および頂部集電端子５５への接合のこと
を考慮して決定する。つまり、集電体４０の捲回厚み
（電極体４０の捲回外径と捲回内径との差の半分）が大
きくなれば、捲回外周部にある電極合材層未形成部１
３、２３を捲回中心部にある集電端子５０、５５に接合
させるために、電極合材層未形成部１３、２３の幅をよ
り広くするのが望ましい。The width of the electrode mixture layer non-formed portions 13 and 23 is determined in consideration of joining to the bottom current collecting terminal 50 and the top current collecting terminal 55. That is, if the wound thickness of the current collector 40 (half the difference between the wound outer diameter and the wound inner diameter of the electrode body 40) is increased, the electrode mixture layer-free portion 1 on the wound outer peripheral portion is formed.
In order to join the terminals 3 and 23 to the current collecting terminals 50 and 55 located at the center of the winding, it is desirable to increase the width of the electrode mixture layer non-formed portions 13 and 23.
【００２３】上記の実施形態の場合は、電極シート１
０、２０の幅は一定であり、かつ電極合材層未形成部１
３、２３の幅も一定である。この実施形態に代えて、電
極シート１０、２０の幅を捲回外周部に位置させる部分
になる程広くすることもできる。つまり、集電体の１
１、２１の一辺を斜辺状にし、一定幅の電極合材層１
２、２２を形成させることで、電極合材未形成部１３、
２３を徐々に広くするのである。このような実施形態を
採れば、電極体４０の捲回外周部に位置する電極シート
１０、２０程、電極合材層未形成部１３、２３が幅広く
なる。したがって、電極体４０の捲回厚みが大きい場合
であっても、電極合材層未形成部１３、２３を重ね合わ
せて接合する集電端子５０、５５を短くすることがで
き、つまり、電極合材層１２、２２のみが捲回されてい
る部分よりの突出代を小さくすることができ、電池の出
力体積密度、エネルギ体積密度をより小さくすることも
できる。In the case of the above embodiment, the electrode sheet 1
The width of 0, 20 is constant, and the electrode mixture layer-free portion 1
The width of 3, 23 is also constant. Instead of this embodiment, the widths of the electrode sheets 10 and 20 can be made wider as they become closer to the winding outer peripheral portion. That is, one of the current collectors
The electrode mixture layer 1 having a fixed width is formed by making one side of the electrode 1, 21 an oblique side.
By forming 2, 22, the electrode mixture unformed portion 13,
23 gradually widens. According to such an embodiment, the portion of the electrode sheet 10, 20 located on the outer periphery of the wound electrode body 40 becomes wider in the portion 13, 23 where the electrode mixture layer is not formed. Therefore, even when the wound thickness of the electrode body 40 is large, the current collecting terminals 50 and 55 for overlapping and joining the electrode-mixture-layer-unformed portions 13 and 23 can be shortened. The protrusion allowance from the portion where only the material layers 12 and 22 are wound can be reduced, and the output volume density and energy volume density of the battery can be further reduced.
【００２４】電極合材層１２、２２は、集電体１１、２
１の片面に形成するものでもよく、また集電体１１、２
１の両面に形成するものであってもよい。ただし、電池
の出力密度、エネルギ密度等を考慮すれば両面に形成す
るのが望ましく、その場合は両面に電極合材層未形成部
１３、２３を設け、両面の電極合材層未形成部１３、２
３がそれぞれ幅方向の同じ一端部に位置するようにすれ
ばよい。The electrode mixture layers 12 and 22 are composed of the current collectors 11 and 2
1 may be formed on one side, and the current collectors 11, 2
One may be formed on both surfaces. However, in consideration of the output density and energy density of the battery, it is desirable to form them on both sides. In this case, the electrode mixture layer-free portions 13 and 23 are provided on both surfaces, and the electrode mixture layer-free portions 13 on both surfaces are provided. , 2
3 may be located at the same one end in the width direction.
【００２５】正極シート１０、負極シート２０に電極合
材層未形成部１３、２３を形成させる工程、つまり、電
極合材層未形成部１３、２３を設けるように、集電体１
１、２１の表面に電極合材層１２、２２を形成する工程
は、特に限定されるものでなく、種々の方法によって行
うことができる。リチウムイオン二次電池の場合、この
電極合材層１２、２２の形成は、連続的に塗布、乾燥が
行えるコータと呼ばれる塗工機を用いて、塗工という方
法によって行うのが一般的であり、この方法に従えばよ
い。The step of forming the electrode mixture layer-free portions 13 and 23 on the positive electrode sheet 10 and the negative electrode sheet 20, that is, the current collector 1 so that the electrode mixture layer-free portions 13 and 23 are provided
The steps of forming the electrode mixture layers 12 and 22 on the surfaces of the electrodes 1 and 21 are not particularly limited, and can be performed by various methods. In the case of a lithium ion secondary battery, the formation of the electrode mixture layers 12, 22 is generally performed by a method called coating using a coating machine called a coater capable of continuous coating and drying. This method may be followed.
【００２６】リチウムイオン二次電池の場合、正極集電
体１１には、アルミニウム等の金属箔でその厚みは１０
〜２０μｍ程度のものを使用することができる。この正
極集電体１１に塗工される正極合材は、例えば、リチウ
ム複合酸化物粉末等からなる活物質に黒鉛等の導電材、
ポリフッ化ビニリデン等の結着剤を混合し、ｎ−メチル
ピロリドン等の溶剤を適量加えたもので、ペースト状と
なっているものを用いればよい。負極集電体２１には、
銅等の金属箔でその厚みは５〜２０μｍ程度のものを使
用することができる。この負極集電体２１に塗工される
負極合材は、例えば、黒鉛等の炭素材料粉末からなる活
物質に、ポリフッ化ビニリデン等の結着剤を混合し、ｎ
−メチルピロリドン等の溶剤を適量加えたもので、正極
合材同様、ペースト状となっているものを用いればよ
い。なお電極合材層の厚みは、片面あたり、５０〜２５
０μｍとするのが望ましく、またリチウムイオン二次電
池の場合は、デンドライトの析出等を考慮して負極合材
層２２の幅を正極合材１２の幅よりも若干量広く形成さ
せるのが望ましい。In the case of a lithium ion secondary battery, the positive electrode current collector 11 is made of a metal foil such as aluminum and has a thickness of 10
の も の 20 μm can be used. The positive electrode mixture applied to the positive electrode current collector 11 is, for example, an active material such as a lithium composite oxide powder, a conductive material such as graphite,
A paste-like material obtained by mixing a binder such as polyvinylidene fluoride and adding an appropriate amount of a solvent such as n-methylpyrrolidone may be used. The negative electrode current collector 21 includes:
A metal foil such as copper having a thickness of about 5 to 20 μm can be used. The negative electrode mixture applied to the negative electrode current collector 21 is obtained, for example, by mixing a binder such as polyvinylidene fluoride with an active material made of a carbon material powder such as graphite.
A paste in which a solvent such as methylpyrrolidone is added in an appropriate amount and which is in the form of a paste like the positive electrode mixture may be used. The thickness of the electrode mixture layer is 50 to 25 per side.
In the case of a lithium ion secondary battery, it is preferable that the width of the negative electrode mixture layer 22 be slightly larger than the width of the positive electrode mixture 12 in consideration of dendrite precipitation and the like.
【００２７】〈電極体の形成〉リチウムイオン二次電池
についての実施形態である本筒型電池の場合、電極合材
層１２、２２が形成された正極シート１０および負極シ
ート２０は、その間にセパレータ３０を挟装させられて
捲回芯を中心にロール状に捲回され、電極体４０が形成
される。セパレータ３０は、正極シート１０および負極
シート２０を物理的に隔離し、電解液を保持する役割を
果たすものであり、厚さ２０〜４０μｍ程度のポリエチ
レン等の微多孔質膜を用いるのがよい。なお、セパレー
タの幅は、絶縁を担保するため、正極合材層および負極
合材層の塗工幅より若干広くするのが望ましい。<Formation of Electrode Body> In the case of the present cylindrical battery which is an embodiment of the lithium ion secondary battery, the positive electrode sheet 10 and the negative electrode sheet 20 on which the electrode mixture layers 12 and 22 are formed are separated by a separator. The electrode body 40 is formed by being wound in a roll shape with the wound core 30 interposed therebetween. The separator 30 serves to physically separate the positive electrode sheet 10 and the negative electrode sheet 20 and retain the electrolytic solution, and it is preferable to use a microporous film of polyethylene or the like having a thickness of about 20 to 40 μm. The width of the separator is preferably slightly larger than the coating width of the positive electrode mixture layer and the negative electrode mixture layer in order to secure insulation.
【００２８】捲回芯４５を中心にして、正極シート１０
および負極シート２０を、セパレータ３０を介して捲回
する様子を図３に示す。この図が示すように、セパレー
タ３０、負極シート２０、セパレータ３０、正極シート
１０の４枚を層状に重ねて捲回する。この際、正極シー
ト１０の正極合材層未形成部１３と負極シート２０の負
極合材層未形成部２３が、幅方向で互いに背向し、正極
合材層未形成部１３がセパレータ３０および負極シート
２０より突出し、負極合材層未形成部２３がセパレータ
３０および正極シート１０より突出するように重ね合わ
せる。With the wound core 45 as the center, the positive electrode sheet 10
FIG. 3 shows how the negative electrode sheet 20 is wound with the separator 30 interposed therebetween. As shown in this figure, four sheets of the separator 30, the negative electrode sheet 20, the separator 30, and the positive electrode sheet 10 are layered and wound. At this time, the portion 13 where the positive electrode mixture layer is not formed on the positive electrode sheet 10 and the portion 23 where the negative electrode mixture layer is not formed on the negative electrode sheet 20 face each other in the width direction. It is superposed so that it protrudes from the negative electrode sheet 20 and the negative electrode mixture layer non-formed portion 23 protrudes from the separator 30 and the positive electrode sheet 10.
【００２９】捲回は捲回機を用い、正極シート１０、負
極シート２０、２枚のセパレータ３０のそれぞれに対し
て、長手方向にテンションをかけ、それぞれが弛まない
ように行う。捲き始めは、セパレータ３０、負極シート
２０、セパレータ３０、正極シート１０、セパレータ３
０・・・・の順となるようにし、捲き終わりは、・・・・セパレ
ータ３０、正極シート１０、セパレータ３０、負極シー
ト２０、セパレータ３０の順となるようにする。The winding is performed using a winding machine, and tension is applied in the longitudinal direction to each of the positive electrode sheet 10, the negative electrode sheet 20, and the two separators 30 so that each of them is not loosened. At the beginning of winding, separator 30, negative electrode sheet 20, separator 30, positive electrode sheet 10, separator 3
.. And the end of winding is... In the order of the separator 30, the positive electrode sheet 10, the separator 30, the negative electrode sheet 20, and the separator 30.
【００３０】このように捲回された後、捲回芯４５を抜
き取り、捲回中心に中空部４１を有する円筒ロール状
（渦巻状）の電極体４０が完成される。形成された電極
体を図４に示す。この図が示すように、電極体４０は、
正極合材層未形成部１３および負極合材層未形成部２３
が、正極合材層および負極合材層が重ね合わされて捲回
されている部分より捲回軸方向の両側に突出した格好に
なっている。After being wound in this manner, the winding core 45 is removed, and a cylindrical roll-shaped (spiral-shaped) electrode body 40 having a hollow portion 41 at the center of the winding is completed. FIG. 4 shows the formed electrode body. As shown in this figure, the electrode body 40
Positive electrode mixture layer unformed portion 13 and negative electrode mixture layer unformed portion 23
However, the shape is such that the positive electrode mixture layer and the negative electrode mixture layer protrude on both sides in the winding axis direction from a portion where the positive electrode mixture layer and the negative electrode mixture layer are overlapped and wound.
【００３１】〈集電端子〉次に、形成した電極体４０の
中空部４１に、底部集電端子５０と頂部集電端子５５と
の２つの集電端子を挿設する。本実施形態の筒型電池に
用いる底部集電端子５０、頂部集電端子５５は、図５に
示す縦断面形状を有する円筒形のものを使用する。な
お、集電端子の形状は、電極体４０の中空部に挿設する
ことができ、かつ、外側面に電極シート１０、２０の電
極合材層未形成部が１３、２３が重ね合わせるように接
合できるものであればいかなる形状であっても構わな
い。つまり、集電端子５０、５５の長さ、横断面形状等
は、電極体の形状、構造等に応じて任意に選択できる。<Current Collecting Terminal> Next, two current collecting terminals, a bottom current collecting terminal 50 and a top current collecting terminal 55, are inserted into the hollow portion 41 of the formed electrode body 40. As the bottom current collecting terminal 50 and the top current collecting terminal 55 used in the cylindrical battery of the present embodiment, those having a cylindrical shape having a longitudinal sectional shape shown in FIG. 5 are used. The shape of the current collecting terminal can be inserted into the hollow portion of the electrode body 40, and the portions 13 and 23 of the electrode sheets 10 and 20 where the electrode mixture layer is not formed are overlapped on the outer surface. Any shape may be used as long as it can be joined. That is, the length, the cross-sectional shape, and the like of the current collecting terminals 50 and 55 can be arbitrarily selected according to the shape, structure, and the like of the electrode body.
【００３２】本実施形態において、中空部５２、５７を
有するような形状を採用したのは、後に詳しく説明する
底部集電端子５０と電池缶６０の底部６１の内壁面との
接合を、抵抗溶接にて行うためである。また、底部集電
端子５０の下端部５４を外側面５１より突出させて太く
形成し、頂部集電端子５５の上端部５８を外側面５６よ
り太く形成している。これは、電極体４０の中空部４１
に集電端子５０、５５を挿設し電極合材層未形成部を重
ね合わせて接合する際に、捲回軸方向における集電端子
の位置ずれを防ぎ、セッティングを容易にするためであ
る。したがって、中空部５２、５７の有無や、突出端部
５４、５８を設けることについても、電池の製造方法、
電極体の形状等に応じて任意に採用できるものとなる。In the present embodiment, the shape having the hollow portions 52 and 57 is adopted because the joining between the bottom current collecting terminal 50 and the inner wall surface of the bottom portion 61 of the battery can 60 described later in detail is performed by resistance welding. It is for performing in. Further, the lower end portion 54 of the bottom current collecting terminal 50 is formed so as to protrude from the outer surface 51 to be thicker, and the upper end portion 58 of the top current collecting terminal 55 is formed to be thicker than the outer surface 56. This corresponds to the hollow portion 41 of the electrode body 40.
This is because when the current collecting terminals 50 and 55 are inserted and the portions where the electrode mixture layers are not formed are overlapped and joined, the positional deviation of the current collecting terminals in the winding axis direction is prevented, and the setting is facilitated. Therefore, the presence or absence of the hollow portions 52 and 57, and the provision of the protruding end portions 54 and 58 also depend on the method of manufacturing the battery,
It can be arbitrarily adopted according to the shape of the electrode body and the like.
【００３３】本発明の筒型電池では、底部集電端子は電
池缶の底部内壁面に接合される。したがって、底部集電
端子は、電池缶の底部内壁面に接する面を有する必要が
あることから、本実施形態の場合は、有底の円筒形状を
有する底部集電端子５０を採用し、下端面５３が接合面
となる。接合面となる部分の形状もこの形状に限られる
わけではなく、例えば、図６に示すように、円筒状のパ
イプの外側面の一部を延出させ、この延出させた部分を
折り曲げることにより、接合面となる下端面を形成させ
た形状のものであってもよい。この形状のものは、上記
本実施形態の底部集電端子５０と比べて、部品製作が容
易でかつ軽量であるという利点を有する。In the cylindrical battery of the present invention, the bottom current collecting terminal is joined to the bottom inner wall surface of the battery can. Therefore, since the bottom current collecting terminal needs to have a surface in contact with the bottom inner wall surface of the battery can, in the case of the present embodiment, the bottom current collecting terminal 50 having a bottomed cylindrical shape is employed, 53 becomes a joining surface. The shape of the portion to be the joining surface is not limited to this shape. For example, as shown in FIG. 6, a part of the outer surface of the cylindrical pipe is extended, and the extended portion is bent. Thus, a shape having a lower end surface serving as a joint surface may be formed. This shape has the advantage that the parts can be easily manufactured and lighter than the bottom current collecting terminal 50 of the present embodiment.
【００３４】底部集電端子５０、頂部集電端子５５の２
つの集電端子は、いずれも電気伝導性のある材料からな
る必要がある。例えば、リチウムイオン二次電池の場
合、正極側の集電端子は、アルミニウム等により、負極
側の集電端子は銅、ニッケル、ステンレス鋼等により形
成させることができる。上記本実施形態の場合、電極シ
ート１０、２０の捲回後に、捲回芯４５を取り外して電
極体４０を完成させている。この実施形態に代えて、捲
回芯４５を残したまま電極体４０を完成させるものであ
ってもよい。つまり、予め集電端子が挿設される部分を
見込んで、長さの短い捲回芯を利用して、電極体を形成
させるのである。このようにすれば、捲回芯の分だけ電
池重量が大きくなるが、捲回して形成された電極体４０
の、その後の工程における形崩れを防止する効果があ
る。また、絶縁性のある材料からなる中間部材を用い、
その一端に底部集電端子と頂部集電端子のいずれかを接
合し、あるいはその両端にそれぞれ底部集電端子と頂部
集電端子を接合し、集電端子と一体化した捲回芯を用い
ることもできる。図７に、樹脂製の中間部材４６の両端
に底部集電端子５０と頂部集電端子５５とを接合させた
捲回芯を示す。このように集電端子と一体化させた捲回
芯を用いれば、改めて集電端子を挿設させる作業が不要
となり、なお一層の電池製作工数の削減となる。The bottom current collecting terminal 50 and the top current collecting terminal 55 2
Each of the current collecting terminals needs to be made of an electrically conductive material. For example, in the case of a lithium ion secondary battery, the current collecting terminal on the positive electrode side can be formed of aluminum or the like, and the current collecting terminal on the negative electrode side can be formed of copper, nickel, stainless steel, or the like. In the case of the present embodiment, after the electrode sheets 10 and 20 are wound, the wound core 45 is removed to complete the electrode body 40. Instead of this embodiment, the electrode body 40 may be completed with the wound core 45 remaining. That is, the electrode body is formed by using a winding core having a short length in anticipation of a portion where the current collecting terminal is to be inserted in advance. By doing so, the battery weight is increased by the amount of the wound core, but the electrode body 40 formed by winding is used.
However, there is an effect of preventing shape collapse in the subsequent steps. Also, using an intermediate member made of an insulating material,
Attach either one of the bottom current collecting terminal and the top current collecting terminal to one end, or join the bottom current collecting terminal and the top current collecting terminal to both ends respectively, and use a winding core integrated with the current collecting terminal. Can also. FIG. 7 shows a wound core in which a bottom current collecting terminal 50 and a top current collecting terminal 55 are joined to both ends of an intermediate member 46 made of resin. If the wound core integrated with the current collecting terminal is used as described above, it is not necessary to newly insert the current collecting terminal, and the number of steps for manufacturing the battery can be further reduced.
【００３５】〈電極合材層未形成部の集電体への接合〉
本発明の筒型電池では、電極シートの電極合材層未形成
部の少なくとも一部を、重ね合わせるようにして、集電
体の外側面に接合する。図８に、本実施形態の筒型電池
の場合の接合であって、周の２等分の位置（接合箇所８
９）において電極合材層未形成部１３、２３を集電端子
５０、５５に接合した様子を示す。<Joining of the portion where the electrode mixture layer is not formed to the current collector>
In the cylindrical battery of the present invention, at least a part of the electrode sheet in which the electrode mixture layer is not formed is joined to the outer surface of the current collector so as to overlap. FIG. 8 shows a joint in the case of the cylindrical battery of the present embodiment, and shows a position at two equal parts of the circumference (joining point 8).
9 shows a state in which the electrode mixture layer non-formed portions 13 and 23 are joined to the current collecting terminals 50 and 55 in 9).
【００３６】本実施形態では、接合箇所８９を２箇所と
したが、これに限定されるものではなく、１箇所で、３
箇所以上で、あるいは全周にわたって連続的に接合する
ものであってもよい。接合箇所が多くなるほど、電池内
部における通電抵抗が減少することから、電池の出力特
性等を考慮した場合は、接合箇所をできるだけ多くする
のが望ましい。リチウムイオン二次電池の場合、後工程
で非水電解液を注入し電極体に含浸させることから、少
なくとも１箇所以上の非接合箇所を設けるのが望まし
い。また、電池が過充電された場合等、電解液の分解か
ら電極体内部にガスが発生することも考えられる。この
ガス抜きという観点からも少なくとも１箇所以上の非接
合部を設けることが望ましい。In this embodiment, the number of the joints 89 is two, but the present invention is not limited to this.
It may be joined at more than a point or continuously over the entire circumference. Since the conduction resistance inside the battery decreases as the number of joints increases, it is desirable to increase the number of joints as much as possible in consideration of the output characteristics and the like of the battery. In the case of a lithium ion secondary battery, it is preferable to provide at least one or more non-joining portions since a non-aqueous electrolyte is injected in the subsequent step to impregnate the electrode body. Further, when the battery is overcharged or the like, gas may be generated inside the electrode body due to decomposition of the electrolytic solution. From the viewpoint of degassing, it is desirable to provide at least one or more non-joined portions.
【００３７】本実施形態の場合、集電端子５０、５５が
円筒状をなしていることから、接合箇所となる集電端子
の外側面５１、５６は曲面で構成され、接合箇所８９の
１箇所あたりの面積は比較的小さい。１箇所あたりの接
合面積を広く採るために、本実施形態の集電端子５０、
５５に代えて、例えば図９に示すように、外側面の一部
が平面となるような集電端子を用いることもできる。こ
の平面部５９に電極合材層未形成部１３、２３を重ね合
わせることにより、接合面積を広く採ることができ、よ
り内部抵抗の小さい、出力特性に優れた電池を構成させ
ることができる。In this embodiment, since the current collecting terminals 50 and 55 have a cylindrical shape, the outer surfaces 51 and 56 of the current collecting terminals to be joined are formed of curved surfaces, and one of the joints 89 is formed. The area per area is relatively small. In order to increase the bonding area per location, the current collecting terminal 50 of the present embodiment,
Instead of 55, for example, as shown in FIG. 9, a current collecting terminal in which a part of the outer surface becomes flat may be used. By superposing the electrode-mixture-layer-free portions 13 and 23 on the flat portion 59, a large bonding area can be obtained, and a battery having smaller internal resistance and excellent output characteristics can be formed.
【００３８】本実施形態の場合、この電極合材層未形成
部１３、２３と集電端子との接合は、超音波接合によっ
て行われている。この接合手段も超音波接合に限定され
るものではない。例えば、抵抗溶接、レーザ溶接、ろう
付け等種々の手段によって行うことができる。この中で
も、本実施形態が採用する超音波接合は、電極合材層未
形成部１３、２３を構成する金属箔集電体１１、２１が
非常に薄い場合等に効率よく接合でき、また、電極合材
層１２、２２への熱影響も少ないことから、リチウムイ
オン二次電池の場合の接合方法として優れている。In the case of the present embodiment, the bonding between the electrode mixture layer-unformed portions 13 and 23 and the current collecting terminal is performed by ultrasonic bonding. This joining means is not limited to ultrasonic joining. For example, it can be performed by various means such as resistance welding, laser welding, and brazing. Among these, the ultrasonic bonding employed in the present embodiment can efficiently bond when the metal foil current collectors 11 and 21 constituting the electrode mixture layer non-formed portions 13 and 23 are extremely thin, and the like. Since the heat influence on the mixture layers 12 and 22 is small, it is excellent as a joining method in the case of a lithium ion secondary battery.
【００３９】超音波接合による接合の様子を、図１０に
示す。超音波接合機は、受け台となるアンビル８２と、
超音波振動を接合部に伝達させるホーン８１とからな
る。本実施形態の底部側つまり負極側の場合、底部集電
端子５０の下端部が閉塞されているため、図１０（ａ）
のように、電極体４０を超音波接合機にセットし、ホー
ン８１を負極合材層未形成部２３の最外周にホーン８１
を当接させ、底部集電端子５０に向かって付勢して、ア
ンビル８２とホーン８１との間で負極合材層未形成部２
３を底部集電端子５０の外側面に重ね合わせるように挟
持する。次いでホーン８１から超音波振動を伝達させて
接合を行えばよい。正極側の場合、図１０（ｂ）に示す
ように、頂部集電端子５５の中空部５７に挿入できるよ
うな棒状のアンビル８２を用い、このアンビル８２を中
空部５７に挿入して電極体４０をセットし、正極合材層
未形成部１３の最外周にホーン８１を当接させ、頂部集
電端子５５に向かって付勢して、頂部集電端子５５の外
側面とホーン８１との間で正極合材層未形成部１３を重
ね合わせるように挟持し、ホーン８１から超音波振動を
伝達させて接合させることもできる。FIG. 10 shows a state of bonding by ultrasonic bonding. The ultrasonic bonding machine includes an anvil 82 serving as a cradle,
A horn 81 for transmitting ultrasonic vibration to the joint. In the case of the bottom side, that is, the negative side, in this embodiment, since the lower end of the bottom current collecting terminal 50 is closed, FIG.
The electrode body 40 is set on the ultrasonic bonding machine as shown in FIG.
Is contacted and urged toward the bottom current collecting terminal 50 so that the negative electrode mixture layer-free portion 2 is formed between the anvil 82 and the horn 81.
3 is sandwiched so as to overlap the outer surface of the bottom current collecting terminal 50. Next, the bonding may be performed by transmitting ultrasonic vibration from the horn 81. In the case of the positive electrode side, as shown in FIG. 10B, a rod-shaped anvil 82 that can be inserted into the hollow portion 57 of the top current collecting terminal 55 is used. Is set, and the horn 81 is brought into contact with the outermost periphery of the portion 13 where the positive electrode mixture layer is not formed, and is urged toward the top current collecting terminal 55 so that the horn 81 is located between the outer surface of the top current collecting terminal 55 and the horn 81. It is also possible to sandwich the positive electrode mixture layer-unformed portions 13 so as to overlap each other and transmit ultrasonic vibrations from the horn 81 for joining.
【００４０】〈電池缶底部と底部集電端子との接合〉本
実施形態の筒型電池では、電池缶６０の底部６１の内壁
面と、底部集電端子５０の下端面５３とを接合させてい
る。電池缶６０は、本実施形態のリチウムイオン二次電
池のように、負極側の外部端子を兼ねる場合、ニッケル
めっき鋼板、ステンレス鋼板等の材料からなるものを使
用するのが望ましい。また、正極側の外部端子を兼ねさ
せる場合には、アルミニウム板、アルミクラッド鋼板等
の材料からなるものを使用するのが望ましい。また、電
池缶６０は、電解液の漏洩等の危険性を小さくするとい
う観点、および部品点数を少なくするといった観点か
ら、単一部材であって継ぎ目のないもの、例えば深絞り
加工によるもの等を用いるのが望ましい。<Joining of Battery Can Bottom and Bottom Current Collection Terminal> In the cylindrical battery of the present embodiment, the inner wall surface of the bottom 61 of the battery can 60 and the lower end surface 53 of the bottom current collection terminal 50 are joined. I have. When the battery can 60 also serves as an external terminal on the negative electrode side, like the lithium ion secondary battery of the present embodiment, it is desirable to use a material such as a nickel-plated steel plate or a stainless steel plate. Further, when the external terminal also serves as the positive electrode side, it is desirable to use one made of a material such as an aluminum plate and an aluminum clad steel plate. In addition, the battery can 60 may be a single member having no seams, for example, by deep drawing, from the viewpoint of reducing the risk of leakage of the electrolyte and the like and reducing the number of parts. It is desirable to use.
【００４１】本実施形態の場合、底部集電端子５０と電
池缶６０との接合は、抵抗溶接によって行われている。
この接合手段についても、特に限定されるものではな
く、種々の接合方法を採用することができる。例えば、
電極体４０を挿設後、電池缶６０の底部６１の外壁面側
から、底部集電端子５０とともにレーザ溶接を行う方
法、また、電池缶６０の底部６１の内壁面と底部集電端
子５０の下端面５３との間にろう材を配置し、電池缶６
０の底部６１の外壁面から加熱することにより、ろう付
けする方法等である。充分な接合強度が得られ、接合作
業を行う時間が非常に短いという理由から、抵抗溶接が
優れており、本実施形態の筒型電池では、抵抗溶接を採
用している。In this embodiment, the bottom current collecting terminal 50 and the battery can 60 are joined by resistance welding.
The joining means is not particularly limited, and various joining methods can be adopted. For example,
After inserting the electrode body 40, a method of performing laser welding together with the bottom current collecting terminal 50 from the outer wall surface side of the bottom 61 of the battery can 60, and the method of performing the inner wall surface of the bottom 61 of the battery can 60 and the bottom current collecting terminal 50 A brazing material is arranged between the lower end surface 53 and the battery can 6.
For example, a method of brazing by heating from the outer wall surface of the bottom 61 of the “0”. Resistance welding is excellent because sufficient bonding strength is obtained and the time for performing the bonding operation is extremely short. The tubular battery of the present embodiment employs resistance welding.
【００４２】電池缶６０の底部６１の内壁面と底部集電
端子５０の下端面５３とを抵抗溶接する様子を図１１に
示す。この図が示すように、抵抗溶接は、頂部集電端子
５５の中空部５７、電極体４０の中空部４１、底部集電
端子５０の中空部５２を経て、底部集電端子５０の底部
に当接する棒状の溶接電極９１と、電池缶６０の底部６
１の外壁面に当接する溶接電極９２の２つの溶接電極と
で、底部集電端子５０と電池缶６０の底部６１を挟み付
けるように加圧しつつ、単相交流溶接機９３にて通電さ
せることにより行うことができる。FIG. 11 shows how the inner wall surface of the bottom 61 of the battery can 60 and the lower end surface 53 of the bottom current collecting terminal 50 are resistance-welded. As shown in this figure, the resistance welding is applied to the bottom of the bottom current collecting terminal 50 through the hollow 57 of the top current collecting terminal 55, the hollow 41 of the electrode body 40, and the hollow 52 of the bottom current collecting terminal 50. The contact rod-shaped welding electrode 91 and the bottom 6 of the battery can 60
The electric current is supplied by a single-phase AC welding machine 93 while applying pressure so that the bottom current collecting terminal 50 and the bottom 61 of the battery can 60 are sandwiched between the two welding electrodes 92 of the welding electrode 92 abutting on the outer wall surface of the first. Can be performed.
【００４３】なお、底部集電端子５０の接合面となる下
端面５３は、通電時の発熱効率を高め、接合部の面積を
増大させるために、プロジェクション形状とするのが望
ましい。プロジェクション形状としては、例えば、図１
２に示すように、（ａ）ドーム型、（ｂ）単一プロジェ
クション型、（ｃ）リングプロジェクション型、（ｄ）
複数プロジェクション型等を採用できる。It is desirable that the lower end face 53, which is the joining surface of the bottom current collecting terminal 50, has a projection shape in order to increase the heat generation efficiency during energization and increase the area of the joining portion. As the projection shape, for example, FIG.
As shown in FIG. 2, (a) dome type, (b) single projection type, (c) ring projection type, (d)
Multiple projection types can be adopted.
【００４４】実際に、抵抗溶接を行って、接合部面積お
よび接合強度について評価した。電池缶６０は、厚さ
０．５ｍｍのニッケルめっき鋼板であり、底部集電端子
５０はニッケル製で、底部の厚さは１ｍｍとした。２つ
の溶接電極９１、９２はいずれもクロム銅製で、棒状溶
接電極９１は６ｍｍφのものを使用した。溶接電流は５
ｋＡ、溶接時間は１／６ｓｅｃ（１０サイクル）とし
た。この結果、接合部には３．５ｍｍφのナゲットが形
成され、接合部は、約９．６ｍｍ2と充分な面積が得ら
れた。また、引っ張り試験を行った結果、栓抜け母材破
断を呈し、接合強度も充分なものであった。Actually, resistance welding was performed to evaluate the joint area and the joint strength. The battery can 60 was a nickel-plated steel sheet having a thickness of 0.5 mm, the bottom current collecting terminal 50 was made of nickel, and the bottom thickness was 1 mm. The two welding electrodes 91 and 92 were both made of chromium copper, and the rod-shaped welding electrode 91 used had a diameter of 6 mm. The welding current is 5
kA and welding time were set to 1/6 sec (10 cycles). As a result, a 3.5 mmφ nugget was formed at the joint, and the joint had a sufficient area of about 9.6 mm 2 . In addition, as a result of a tensile test, the base material was found to break through the plug and the bonding strength was sufficient.
【００４５】〈頂部集電端子と電池缶蓋との接合および
電池の完成〉本実施形態の筒型電池の場合、正極側の外
部端子を電池缶蓋６５が兼ねている。そこで、この電池
缶蓋６５と頂部集電端子５５との間を通電させる必要が
ある。本電池では、帯状の頂部集電用リード７２を用い
て、この頂部集電用リード７２のそれぞれの端部を、電
池缶蓋６５の内壁面と頂部集電用端子５５の突出端部５
８に接合させることによって通電させている。この接合
は、超音波接合により行っているが、接合方法は、超音
波接合に限定されるものではない。<Joining the Top Current Collector Terminal and Battery Can Lid and Completion of Battery> In the case of the cylindrical battery of the present embodiment, the battery can lid 65 also serves as an external terminal on the positive electrode side. Therefore, it is necessary to conduct electricity between the battery can lid 65 and the top current collecting terminal 55. In the present battery, a band-shaped top current collecting lead 72 is used, and each end of the top current collecting lead 72 is connected to the inner wall surface of the battery can lid 65 and the projecting end 5 of the top current collecting terminal 55.
8 to be energized. This bonding is performed by ultrasonic bonding, but the bonding method is not limited to ultrasonic bonding.
【００４６】電池缶蓋６５は、アルミニウム板、アルミ
クラッド鋼板等の材料から形成すればよく、また、頂部
集電用リード７２は、同様に、アルミニウム等の材料か
ら形成すればよい。なお電池缶蓋６５が負極側の外部端
子を兼ねる場合には、電池缶蓋６５や頂部集電用リード
７２は、頂部集電端子５５と接合可能な材料から形成す
ればよく、頂部集電端子５５がニッケル製の場合には、
電池缶蓋６５をニッケルめっき鋼板、ステンレス鋼板等
から、頂部集電用リード７２をニッケル、ステンレス鋼
板、銅等から形成すればよい。The battery can lid 65 may be formed from a material such as an aluminum plate or an aluminum clad steel plate, and the top current collecting lead 72 may be formed from a material such as aluminum. When the battery can lid 65 also functions as an external terminal on the negative electrode side, the battery can lid 65 and the top current collecting lead 72 may be formed of a material that can be joined to the top current collecting terminal 55. If 55 is made of nickel,
The battery can lid 65 may be formed from a nickel-plated steel plate, a stainless steel plate, or the like, and the top current collecting lead 72 may be formed from nickel, a stainless steel plate, copper, or the like.
【００４７】リチウムイオン二次電池の場合、電極体４
０から正極側、負極側の集電処理が完了した後、電池缶
６０の内部に非水電解液を注入し、電極体４０に含浸さ
せる。非水電解液は、例えば、エチレンカーボネート、
ジエチルカーボネート等の有機溶媒にＬｉＢＦ4、Ｌｉ
ＰＦ6等の電解質を溶解させたものを使用すればよい。
含浸終了後、電池缶６０の開口部６２に電池缶蓋６５を
被せ、ガスケット７１を介在させて開口部６２をカシメ
ることにより電池缶６０を封緘して、本発明の筒型電池
の実施形態である円筒型リチウムイオン二次電池が完成
する。In the case of a lithium ion secondary battery, the electrode body 4
After the current collection process from 0 to the positive electrode side and the negative electrode side is completed, a non-aqueous electrolyte is injected into the battery can 60 to impregnate the electrode body 40. Non-aqueous electrolyte, for example, ethylene carbonate,
LiBF 4 and Li can be added to an organic solvent such as diethyl carbonate.
It may be used those obtained by dissolving an electrolyte such as PF 6.
After completion of the impregnation, the battery can lid 65 is put on the opening 62 of the battery can 60, and the battery can 60 is sealed by caulking the opening 62 with the gasket 71 interposed therebetween. Is completed.
【００４８】〈その他の実施形態〉冒頭に述べたよう
に、本発明の筒型電池は、上記円筒型リチウムイオン二
次電池の実施形態に限定されるものではない。上記説明
の中で述べた各構成要素についてのさまざまな態様を取
捨選択して組み合わせることによって、種々の筒型電池
を構成させることができる。なお、さらに電池内部であ
って、特に電池の頂部に、ＰＴＣ素子、破裂弁等の電池
の安全性を担保するための機構をも組み込む態様であっ
てもよい。<Other Embodiments> As described at the beginning, the cylindrical battery of the present invention is not limited to the cylindrical lithium ion secondary battery. Various cylindrical batteries can be configured by selecting and combining various aspects of each component described in the above description. It should be noted that a mode for securing the safety of the battery, such as a PTC element and a burst valve, may also be incorporated inside the battery, particularly at the top of the battery.
【００４９】また、電池の底部側にのみ、上述した集電
方式を採用し、電池の頂部側に従来からある集電方式を
採用するものであってもよい。このように電池の底部側
にのみ採用する場合であっても、本発明が目的とする電
池の出力密度、エネルギ密度の向上、密閉性の向上、集
電処理コストの低減に対する効果が発揮されるものとな
る。The above-described current collection method may be employed only on the bottom side of the battery, and a conventional current collection method may be employed on the top side of the battery. As described above, even when the battery is adopted only on the bottom side of the battery, the effects of the present invention on the improvement of the output density, the energy density, the improvement of the sealing property, and the reduction of the current collection processing cost of the battery are exhibited. It will be.
【００５０】さらに、電池の頂部側の集電方式に、図１
３に示すような方式をも採用することができる。図１３
に示す方式は、板状の集電端子７３を用い、この板状集
電端子７３を電極体４０の捲回厚みの中間部に位置さ
せ、超音波接合等の手段によって、電極合材層未形成部
１３、２３を板状集電端子７３の両面に重ねあわせるよ
うに接合するものである。そして、図には示していない
が、板状集電端子７３から集電用リードを用いて電池缶
蓋の内壁面にまで通電させるものである。このように、
小型部品を用いて集電できることは、電池の重量を軽く
することを可能にする。また、捲回厚みの中間部分で集
電すれば、電極合材層未形成部１３、２３の幅をより小
さくすることができ、電池内部の集電処理のためのスペ
ースをさらに小さくすることを可能にする。Further, the current collecting method on the top side of the battery is shown in FIG.
The method shown in FIG. 3 can also be adopted. FIG.
In the method shown in (1), a plate-shaped current collecting terminal 73 is used, and the plate-shaped current collecting terminal 73 is positioned at an intermediate portion of the winding thickness of the electrode body 40. The forming portions 13 and 23 are joined so as to overlap on both surfaces of the plate-like current collecting terminal 73. Although not shown in the figure, the power is supplied from the plate-like current collecting terminal 73 to the inner wall surface of the battery can lid using a current collecting lead. in this way,
The ability to collect current using small components allows the weight of the battery to be reduced. In addition, if the current is collected in the middle part of the winding thickness, the width of the electrode mixture layer non-formed portions 13 and 23 can be further reduced, and the space for the current collection process inside the battery can be further reduced. enable.
【００５１】[0051]
【発明の効果】本発明の筒型電池は、一方の極の集電処
理方式を、電極合材層未形成部に何ら特別な加工をせ
ず、重ねあわせるように電極体の捲回中心部に位置する
集電端子に接合し、かつ、この集電端子を電池缶の底部
内壁面に接合するように構成したものである。このよう
な構成の集電処理方式の採用により、本発明の筒型電池
は、密閉性に優れ、集電処理のためのコストが安く、か
つ出力密度、エネルギ密度の高い筒型電池となる。さら
に本発明の筒型電池では、他方の極の集電処理方式を
も、電極合材層未形成部に何ら特別な加工をせず、重ね
あわせるように電極体の捲回中心部に位置する集電端子
に接合する構成とすることができる。このことにより、
本発明の筒型電池は、より高性能低価格な筒型電池とな
るAccording to the cylindrical battery of the present invention, the current collecting process of one of the electrodes is performed by overlapping the central portion of the electrode body so as to be overlapped without any special processing on the portion where the electrode mixture layer is not formed. , And the current collecting terminal is joined to the bottom inner wall surface of the battery can. By adopting the current collection processing method having such a configuration, the cylindrical battery of the present invention is excellent in hermeticity, low in cost for current collection processing, and has a high output density and a high energy density. Furthermore, in the cylindrical battery of the present invention, the current collection processing method of the other electrode is also located at the center of the wound electrode body so as to be overlapped without any special processing on the electrode mixture layer non-formed portion. It can be configured to be joined to the current collecting terminal. This allows
The cylindrical battery of the present invention is a higher-performance, lower-cost cylindrical battery.
【図１】 本発明の筒型電池の代表的な実施形態である
円筒型リチウムイオン二次電池の内部構造を示す。FIG. 1 shows an internal structure of a cylindrical lithium ion secondary battery which is a typical embodiment of a cylindrical battery of the present invention.
【図２】 実施形態である円筒型リチウムイオン二次電
池に用いる電極シートを示す。FIG. 2 shows an electrode sheet used for the cylindrical lithium ion secondary battery according to the embodiment.
【図３】 円筒型リチウムイオン二次電池の実施形態に
おいて、電極シートが捲回される様子を示す。FIG. 3 shows how an electrode sheet is wound in an embodiment of a cylindrical lithium ion secondary battery.
【図４】 実施形態である円筒型リチウムイオン二次電
池に用いる電極シートを捲回して形成した電極体を示
す。FIG. 4 shows an electrode body formed by winding an electrode sheet used for a cylindrical lithium ion secondary battery according to the embodiment.
【図５】 実施形態である円筒型リチウムイオン二次電
池に用いる頂部集電端子および底部集電端子の断面を示
す。FIG. 5 shows a cross section of a top current collecting terminal and a bottom current collecting terminal used in the cylindrical lithium ion secondary battery according to the embodiment.
【図６】 実施形態の円筒型リチウムイオン二次電池に
用いることのできる底部集電端子であって、下端面を屈
曲させて形成した態様のものを示す。FIG. 6 shows a bottom current collecting terminal that can be used in the cylindrical lithium ion secondary battery of the embodiment, in which the lower end surface is bent.
【図７】 実施形態の円筒型リチウムイオン二次電池に
用いることができる捲回芯であって、底部集電端子およ
び頂部集電端子が一体化されたものを示す。FIG. 7 shows a wound core that can be used in the cylindrical lithium ion secondary battery of the embodiment, in which a bottom current collecting terminal and a top current collecting terminal are integrated.
【図８】 円筒型リチウムイオン二次電池の実施形態に
おいて、電極合材層未形成部が集電端子の外側面に接合
された様子を示す。FIG. 8 shows a state where an electrode mixture layer-unformed portion is joined to an outer surface of a current collecting terminal in an embodiment of a cylindrical lithium ion secondary battery.
【図９】 実施形態の円筒型リチウムイオン二次電池に
用いることができる底部集電端子であって、外側面に平
面部を形成させた態様のものを示す。FIG. 9 shows a bottom current collecting terminal that can be used in the cylindrical lithium ion secondary battery of the embodiment, in which a flat portion is formed on the outer surface.
【図１０】 円筒型リチウムイオン二次電池の実施形態
において、電極合材層未形成部が超音波接合によって接
合される様子を示す。FIG. 10 shows a state in which an electrode mixture layer-unformed portion is joined by ultrasonic joining in an embodiment of a cylindrical lithium ion secondary battery.
【図１１】 円筒型リチウムイオン二次電池の実施形態
において、底部集電端子が抵抗溶接によって電池缶底部
の内壁面に接合される様子を示す。FIG. 11 shows a state in which the bottom current collecting terminal is joined to the inner wall surface of the bottom of the battery can by resistance welding in the embodiment of the cylindrical lithium ion secondary battery.
【図１２】 実施形態である円筒型リチウムイオン二次
電池に用いる底部集電端子の下端面に施すことができる
プロジェクション形状を示す。FIG. 12 shows a projection shape that can be formed on the lower end surface of the bottom current collecting terminal used for the cylindrical lithium ion secondary battery according to the embodiment.
【図１３】 本発明の筒型電池において、頂部側に採用
できる別の集電方式を示す。FIG. 13 shows another current collection method that can be employed on the top side in the cylindrical battery of the present invention.
【図１４】 従来の筒型電池に用いる正極シートおよび
負極シートであって、集電用リードが切り欠きによって
形成されたものを示す。FIG. 14 shows a positive electrode sheet and a negative electrode sheet used in a conventional cylindrical battery, in which current collecting leads are formed by notches.
【図１５】 従来の筒型電池において、正極シート、負
極シートおよびセパレータを捲回する様子を示す。FIG. 15 shows how a positive electrode sheet, a negative electrode sheet, and a separator are wound in a conventional cylindrical battery.
【図１６】 従来の筒型電池において、正極シート、負
極シートおよびセパレータを捲回して形成された電極体
を示す。FIG. 16 shows an electrode body formed by winding a positive electrode sheet, a negative electrode sheet, and a separator in a conventional cylindrical battery.
【図１７】 従来の筒型電池において、レーザー溶接に
よって集電処理される様子を示す。FIG. 17 shows how a current is collected by laser welding in a conventional cylindrical battery.
【図１８】 従来の筒型電池において、超音波接合によ
って集電処理される様子を示す。FIG. 18 shows how a current is collected by ultrasonic bonding in a conventional cylindrical battery.
【図１９】 従来の筒型電池に用いる正極シートおよび
負極シートであって、集電用リードが超音波接合によっ
て形成されたものを示す。FIG. 19 shows a positive electrode sheet and a negative electrode sheet used for a conventional cylindrical battery, in which current collecting leads are formed by ultrasonic bonding.
１０：正極シート １１：正極集電体 １２：正極合材層 １３：正極合材層未形成部 ２０：負極シート ２１：負極集電体 ２２：負極合材層 ２３：負極合材層未形成部 ３０：セパレータ ４０：電極体 ４１：中空部 ４５：捲回芯 ４６：捲回芯絶縁部 ５０：底部集電端子 ５１：外側面 ５２：中空部 ５３：下端面 ５４：突出端部 ５５：頂部集電端子 ５６：外側面 ５７：中空部 ５８：突出端部 ５９：平面部 ６０：電池缶 ６１：底部 ６２：開口部 ６５：電池缶蓋 ６６：突出部 ７１：ガスケット ７２：頂部集電用リード ７３：板状集電端子 ８１：ホーン ８２：アンビル ８９：接合個所 ９１：棒状溶接電極 ９２：溶接電極 ９３：単相交流溶接機 10: Positive electrode sheet 11: Positive electrode current collector 12: Positive electrode mixture layer 13: Positive electrode mixture layer unformed portion 20: Negative electrode sheet 21: Negative electrode current collector 22: Negative electrode mixture layer 23: Negative electrode mixture layer non-formed portion 30: Separator 40: Electrode body 41: Hollow part 45: Winding core 46: Winding core insulating part 50: Bottom current collecting terminal 51: Outer surface 52: Hollow part 53: Lower end surface 54: Projecting end 55: Top collecting Terminal 56: Outer side 57: Hollow part 58: Projecting end 59: Flat part 60: Battery can 61: Bottom 62: Opening 65: Battery can lid 66: Projecting part 71: Gasket 72: Top collecting lead 73 : Plate-shaped current collecting terminal 81: Horn 82: Anvil 89: Joint part 91: Rod-shaped welding electrode 92: Welding electrode 93: Single-phase AC welding machine
───────────────────────────────────────────────────── フロントページの続き (72)発明者 渡辺 吾朗 愛知県愛知郡長久手町大字長湫字横道41番 地の１株式会社豊田中央研究所内 (72)発明者 正木 英之 愛知県愛知郡長久手町大字長湫字横道41番 地の１株式会社豊田中央研究所内 (72)発明者 日置 辰視 愛知県愛知郡長久手町大字長湫字横道41番 地の１株式会社豊田中央研究所内 (72)発明者 中野 昭 愛知県愛知郡長久手町大字長湫字横道41番 地の１株式会社豊田中央研究所内 (72)発明者 伊藤 勇一 愛知県愛知郡長久手町大字長湫字横道41番 地の１株式会社豊田中央研究所内 (72)発明者 野崎 耕 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 竹内 友康 愛知県刈谷市昭和町１丁目１番地 株式会 社デンソー内 Ｆターム(参考） 5H022 AA04 AA09 AA18 BB16 BB17 CC08 CC12 CC16 CC22 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Goro Watanabe 41-Yokomichi, Nagakute-cho, Aichi-gun, Aichi Prefecture Inside Toyota Central Research Institute, Inc. 41, Yokomichi, Toyota Central Research Laboratory Co., Ltd. (72) Inventor Tatsumi Hioki 41, Chuo-Cho, Yoji, Nagakute-cho, Aichi-gun, Aichi Prefecture 1, Toyota Motor Central Research Laboratories Co., Ltd. 41 Toyota Chuo R & D Co., Ltd., No. 41, Nagachute-cho, Nagakute-cho, Aichi-gun, Japan (72) Inventor Yuichi Ito 41 Toyota Chuo-Laboratory, Co., Ltd. ) Inventor Ko Nozaki 1 Toyota Town, Toyota City, Aichi Prefecture Inside Toyota Motor Corporation (72) Inventor Tomoyasu Takeuchi Showa Town, Kariya City, Aichi Prefecture Street address 1 stock company Denso in the F-term (reference) 5H022 AA04 AA09 AA18 BB16 BB17 CC08 CC12 CC16 CC22
Claims (7)
子を兼ねる有底の筒型電池缶と、 それぞれの金属箔集電体とその表面に形成されたそれぞ
れの電極合材層とからなる帯状の正極シートおよび負極
シートの２つの電極シートをロール状に捲回して形成さ
れ、捲回中心軸が前記電池缶の底部の内壁面に対して概
直角になるように該電池缶内部に挿設された電極体と、 前記２つの電極シートのうちの一方の電極シートから集
電しかつ前記電池缶に通電させる集電端子とを備えてな
る筒型電池であって、 前記集電端子に集電される前記一方の電極シートは、幅
方向の一端部に全長にわたる電極合材層未形成部を有
し、 前記電極体は、前記一方の電極シートの前記電極合材層
未形成部を他方の電極シートから突出させるように前記
２つの電極シートを捲回しかつ捲回中心に中空部を有す
るように形成され、かつ、該一方の電極シートの電極合
材層未形成部が前記電池缶の底部側に位置するように該
電池缶に挿設されており、 前記集電端子は、前記電極体の中空部の前記一方の電極
シートの電極合材層未形成部に対向する位置にその１の
端面が前記電池缶の底部内壁面に接するように挿設され
ており、 前記一方の電極シートの電極合材層未形成部は、その少
なくとも一部が前記集電端子の外側面に重ね合わさるよ
うに接合され、かつ、前記集電端子の前記１の端面は、
前記電池缶の底部内壁面に接合されていることを特徴と
する筒型電池。1. A strip comprising a bottomed cylindrical battery can serving also as an external terminal of one of a positive electrode and a negative electrode, each metal foil current collector and each electrode mixture layer formed on the surface thereof. The positive electrode sheet and the negative electrode sheet are formed by winding two electrode sheets into a roll shape, and inserted into the battery can such that the center axis of the winding is substantially perpendicular to the inner wall surface at the bottom of the battery can. And a current collecting terminal for collecting current from one of the two electrode sheets and supplying electricity to the battery can, wherein the current collecting terminal collects electricity. The one electrode sheet to be charged has an electrode mixture layer-unformed portion over the entire length at one end in the width direction, and the electrode body is the other of the electrode mixture layer-unformed portion of the one electrode sheet. The two electrode screens project from the electrode sheet of The electrode can is formed so as to have a hollow portion at the center of the wound and the electrode mixture layer-free portion of the one electrode sheet is located on the bottom side of the battery can. The current collector terminal has one end face in contact with a bottom inner wall surface of the battery can at a position facing a portion of the one electrode sheet where the electrode mixture layer is not formed in the hollow portion of the electrode body. The electrode mixture layer unformed portion of the one electrode sheet is joined so that at least a part thereof is overlapped on the outer surface of the current collecting terminal, and The first end face is
A cylindrical battery, which is joined to a bottom inner wall surface of the battery can.
芯を有する請求項１に記載の筒型電池であって、 前記捲回芯は、一端部が前記集電端子となるように形成
されている筒型電池。2. The cylindrical battery according to claim 1, further comprising a wound core around which the two electrode sheets are wound, wherein the wound core has one end serving as the current collecting terminal. A cylindrical battery that is formed.
１つの集電端子を備えてなる請求項１に記載の筒型電池
であって、 前記他方の電極シートは、前記一方の電極シートの前記
電極合材層未形成部に背向する幅方向の一端部に全長に
わたる電極合材層未形成部を有し、 前記電極体は、前記他方の電極シートの前記電極合材層
未形成部を前記一方の電極シートから突出させるように
前記２つの電極シートを捲回して形成されており、 前記もう１つの集電端子は、前記電極体の中空部の前記
他方の電極シートの電極合材層未形成部に対向する位置
に挿設されており、 前記他方の電極シートの電極合材層未形成部は、その少
なくとも一部が前記もう１つの集電端子の外側面に重ね
合わさるように接合されている筒型電池。3. The cylindrical battery according to claim 1, further comprising another current collecting terminal for collecting current from the other electrode sheet, wherein the other electrode sheet is formed of the one electrode sheet. At one end in the width direction opposite to the electrode-mixture-layer-unformed portion, there is an electrode-mixture-layer-unformed portion over the entire length, and the electrode body is the electrode-mixture-layer-unformed portion of the other electrode sheet Are formed by winding the two electrode sheets so as to protrude from the one electrode sheet, and the other current collecting terminal is an electrode mixture of the other electrode sheet in a hollow portion of the electrode body. The electrode mixture layer non-formation portion of the other electrode sheet is inserted at a position facing the layer non-formation portion such that at least a part of the electrode mixture layer non-formation portion overlaps the outer surface of the another current collecting terminal. A cylindrical battery that is joined.
芯を有する請求項３に記載の筒型電池であって、 前記捲回芯は、一端部が前記集電端子となりかつ他端部
が前記もう一つの集電端子となるように形成されている
筒型電池。4. The cylindrical battery according to claim 3, further comprising a wound core around which the two electrode sheets are wound, wherein one end of the wound core serves as the current collecting terminal and the other end. A cylindrical battery in which a part is formed as the another current collecting terminal.
との少なくともいずれか一方はその外側面の少なくとも
一部が平面部となっており、該平面部に前記電極シート
の電極合材層未形成部が接合されている請求項１ないし
４のいずれかに記載の筒型電池。5. An at least one of said current collecting terminal and said another current collecting terminal, wherein at least a part of an outer surface thereof is a flat portion, and said flat portion has an electrode mixture of said electrode sheet. The cylindrical battery according to any one of claims 1 to 4, wherein a portion where the layer is not formed is joined.
電極合材層未形成部との接合と、前記もう１つの集電端
子と前記他方の電極シートの電極合材層未形成部との接
合の少なくともいずれか一方は、超音波接合によってな
されている請求項１ないし請求項５のいずれかに記載の
筒型電池。6. A junction between the current collecting terminal and a portion of the one electrode sheet where the electrode mixture layer is not formed, and a connection between the another current collecting terminal and the portion where the electrode mixture layer is not formed of the other electrode sheet. The cylindrical battery according to any one of claims 1 to 5, wherein at least one of the bonding is performed by ultrasonic bonding.
との接合は、抵抗溶接によってなされている請求項１な
いし請求項６のいずれかに記載の筒型電池。7. The cylindrical battery according to claim 1, wherein the current collecting terminal and the bottom inner wall surface of the battery can are joined by resistance welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03342799A JP3707945B2 (en) | 1999-02-10 | 1999-02-10 | Cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03342799A JP3707945B2 (en) | 1999-02-10 | 1999-02-10 | Cylindrical battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000231913A true JP2000231913A (en) | 2000-08-22 |
| JP3707945B2 JP3707945B2 (en) | 2005-10-19 |
Family
ID=12386268
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03342799A Expired - Fee Related JP3707945B2 (en) | 1999-02-10 | 1999-02-10 | Cylindrical battery |
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| Country | Link |
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| JP (1) | JP3707945B2 (en) |
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