JP2002216853A - Nonaqueous electrolyte secondary cell, and manufacturing method of the same - Google Patents
Nonaqueous electrolyte secondary cell, and manufacturing method of the sameInfo
- Publication number
- JP2002216853A JP2002216853A JP2001012339A JP2001012339A JP2002216853A JP 2002216853 A JP2002216853 A JP 2002216853A JP 2001012339 A JP2001012339 A JP 2001012339A JP 2001012339 A JP2001012339 A JP 2001012339A JP 2002216853 A JP2002216853 A JP 2002216853A
- Authority
- JP
- Japan
- Prior art keywords
- electrode plate
- electrode
- current collector
- electrolyte secondary
- secondary battery
- 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
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、正極板と負極板
を、セパレータを介して巻回した渦巻状の極板群を備え
た非水電解質二次電池およびその製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte secondary battery provided with a spiral electrode group in which a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween, and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】近年、ＡＶ機器やパソコン等、電子機器
のコードレス化やポータブル化に伴って、非水電解質を
備える高エネルギー密度のリチウム二次電池が多く採用
されている。これら実用下にある非水電解質リチウム二
次電池では、負極にはリチウムを吸蔵、放出して低い電
位を示す活物質材料として、黒鉛や非晶質の炭素等が用
いられる。また、正極にはリチウムを吸蔵、放出して高
い電位を示す多くのリチウム含有遷移金属化合物等が活
物質材料として用いられている。なかでもＬｉＣｏ
Ｏ2、ＬｉＭｎ2Ｏ4等は、４Ｖ級の高い動作電圧を安定
して示す材料の一つとして重要視されている。2. Description of the Related Art In recent years, with the trend toward cordless and portable electronic devices such as AV devices and personal computers, high energy density lithium secondary batteries having a non-aqueous electrolyte have been widely used. In these nonaqueous electrolyte lithium secondary batteries in practical use, graphite, amorphous carbon, or the like is used for the negative electrode as an active material material that absorbs and releases lithium and exhibits a low potential. Further, for the positive electrode, many lithium-containing transition metal compounds or the like which show high potential by absorbing and releasing lithium are used as active material. Above all, LiCo
O 2 , LiMn 2 O 4, and the like are regarded as important as one of the materials stably exhibiting a high operating voltage of 4V class.
【０００３】活物質材料は一般にアセチレンブラックや
カーボンブラックのような導電性材料や高分子のフィラ
ー等と必要に応じて混合される。そこへ、結着剤や粘度
調整剤を添加することによりスラリー状の合剤が得られ
る。これを金属の箔、メッシュもしくはラス板またはパ
ンチングメタルなどの集電体に塗布して乾燥し、プレス
して必要な形状に裁断することにより、極板が得られ
る。The active material is generally mixed with a conductive material such as acetylene black or carbon black, a polymer filler, or the like, if necessary. A slurry mixture can be obtained by adding a binder or a viscosity modifier thereto. This is applied to a current collector such as a metal foil, mesh or lath plate, or punched metal, dried, pressed, and cut into a required shape to obtain an electrode plate.
【０００４】非水電解質は、ＬｉＰＦ6やＬｉＢＦ4のよ
うなリチウム塩をエチレンカーボネート、ジメチルカー
ボネート、プロピレンカーボネート、炭酸ジメチル、炭
酸ジエチルのような有機溶媒に溶解した有機電解液が多
用される。また、有機電解液を高分子材料のマトリック
スに包含させて流動しないゲル状にしたポリマー電解
質、あるいは固体の内部をリチウムイオンが移動する固
体電解質なども知られている。As the non-aqueous electrolyte, an organic electrolyte obtained by dissolving a lithium salt such as LiPF 6 or LiBF 4 in an organic solvent such as ethylene carbonate, dimethyl carbonate, propylene carbonate, dimethyl carbonate or diethyl carbonate is often used. In addition, a gelled polymer electrolyte in which an organic electrolytic solution is included in a matrix of a polymer material and which does not flow, or a solid electrolyte in which lithium ions move inside a solid are also known.
【０００５】正極板と負極板の間にポリプロピレン、ポ
リエチレンなどの絶縁材料からなる多孔体がセパレータ
として配置される。ただし、電解質がポリマー電解質や
固体電解質の場合は、正極と負極の間に配置される電解
質がセパレータとして機能することもある。[0005] A porous body made of an insulating material such as polypropylene or polyethylene is disposed as a separator between the positive electrode plate and the negative electrode plate. However, when the electrolyte is a polymer electrolyte or a solid electrolyte, the electrolyte disposed between the positive electrode and the negative electrode may function as a separator.
【０００６】非水電解質はイオンの移動速度が水溶液に
比べて遅いため、実用的な充放電特性を得るためには、
正極板と負極板の対向面積を大きくする必要がある。ま
た、極板間の距離をできるだけ短くする必要もある。そ
こで、薄い帯状の正極と負極の間に薄い帯状のセパレー
タ、あるいはポリマー電解質や固体電解質を介在させ、
巻回して、渦巻状の極板群を得、電池ケースに収納する
製造法が採用されている。Since a non-aqueous electrolyte has a lower ion movement speed than an aqueous solution, in order to obtain practical charge / discharge characteristics,
It is necessary to increase the facing area between the positive electrode plate and the negative electrode plate. It is also necessary to make the distance between the electrode plates as short as possible. Therefore, a thin strip separator or a polymer electrolyte or solid electrolyte is interposed between the thin strip positive electrode and the negative strip,
A manufacturing method is employed in which a spirally wound electrode group is obtained by winding and stored in a battery case.
【０００７】極板群を外装材に収納して電池を構成する
方式には、金属や樹脂製の円筒形または角形の電池ケー
スに極板群を挿入する伝統的な方式と、フイルム状また
はチューブ状の材料を用いて、端子を導出した状態で極
板群を包むフイルムパッケージ方式が多く用いられてい
る。[0007] A battery can be constructed by housing the electrode group in an exterior material. A conventional method of inserting the electrode group into a metal or resin cylindrical or square battery case, a film type or a tube type. A film package system in which a group of electrode plates are wrapped in a state in which terminals are led out using a material of a shape is often used.
【０００８】前者では、極板群をケースに挿入後、必要
に応じて有機電解液を注入し、外部端子と安全弁を有す
る封口板を用いてケースを封口することが多い。後者の
フイルムパッケージ方式は、流動しないポリマー電解質
や固体電解質を用いる薄型電池に多用されている。In the former case, after the electrode group is inserted into the case, an organic electrolyte is injected as needed, and the case is often closed using a sealing plate having an external terminal and a safety valve. The latter film package method is frequently used for thin batteries using a non-flowable polymer electrolyte or solid electrolyte.
【０００９】フイルムパッケージ方式の外装材には、ポ
リエチレンなどの熱可塑性樹脂のフィルム、特開２００
０−２７７０６４号公報に示されるような少なくとも一
面に樹脂層が形成された金属箔が採用されることが多
い。後者の材料は樹脂フィルムと金属箔とのラミネーシ
ョンにより得ることができる。フイルムパッケージ方式
では、一般に端子を外部に導出させた状態で極板群を包
囲し、密封する。フイルムパッケージ方式の一例が特開
２０００−５８０１４号公報に示されている。ここでは
フイルム状外装材として内面に樹脂層のない金属箔を用
い、外装材の内面と極板とを接触させ、外装材の内壁を
それと接触する極板の外部端子としている。As the film package type exterior material, a thermoplastic resin film such as polyethylene,
A metal foil having a resin layer formed on at least one surface as shown in JP-A-227764 is often used. The latter material can be obtained by lamination of a resin film and a metal foil. In the film package method, the electrode group is generally surrounded and sealed in a state where the terminals are led out. An example of the film package system is disclosed in Japanese Patent Application Laid-Open No. 2000-58014. Here, a metal foil having no resin layer on the inner surface is used as the film-like exterior material, the inner surface of the exterior material is brought into contact with the electrode plate, and the inner wall of the exterior material is used as an external terminal of the electrode plate that comes into contact with the electrode.
【００１０】非水電解質電池は一般にエネルギー密度が
重要視される電池である。したがって、電池を使用する
様々な機器に応じて、電池の寸法や形状を設計できるこ
とが、電池の実用性に大きな影響を与える。電池の形状
には、円筒形および断面が矩形もしくは長楕円形の角型
もしくは扁平形がある。後者の場合、極板を扁平状に巻
回したり、円筒状に巻回された極板群を所定の厚さに圧
縮して扁平状にしたりする。電池の厚さを削減するため
に、扁平状の極板群に対してフイルムパッケージ方式が
採用されることも多い。電池の体積や寸法は、極板群の
体積や寸法に左右される。したがって極板群は、できる
限り内寸が小さく、強く緊縛された状態でケース内に収
納される必要がある。A nonaqueous electrolyte battery is a battery in which energy density is generally important. Therefore, the ability to design the size and shape of the battery according to various devices that use the battery greatly affects the practicality of the battery. The shape of the battery includes a cylindrical shape and a rectangular or oblong shape having a rectangular or oblong cross section. In the latter case, the electrode plate is wound in a flat shape, or a group of electrode plates wound in a cylindrical shape is compressed to a predetermined thickness to form a flat shape. In order to reduce the thickness of the battery, a film package method is often adopted for a flat electrode group. The volume and size of the battery depend on the volume and size of the electrode group. Therefore, the electrode plate group needs to be housed in the case in a state in which the inside dimensions are as small as possible and are tightly bound.
【００１１】しかしながら、極板群の最外周を構成する
極板の末端部がほどけて、ケースへの挿入が完了するま
で緊縛状態を保つことができない場合がある。また、極
板群をケースに挿入する際に極板群の最外周がケースの
内壁と摩擦し、極板やセパレータが変形する場合があ
る。極板群が破損したり、緊縛状態にひずみが生じたり
すると、得られる電池の形状が変形したり、内部短絡の
原因を誘発したりする。これらを避けるためには極板群
の最外周の末端部をしっかりと固定する必要がある。However, there is a case where the end portion of the electrode plate constituting the outermost periphery of the electrode plate group is unraveled, so that it may not be possible to maintain the tightened state until the insertion into the case is completed. Further, when the electrode plate group is inserted into the case, the outermost periphery of the electrode plate group may rub against the inner wall of the case, and the electrode plate and the separator may be deformed. When the electrode group is damaged or the strain is generated in the tightened state, the shape of the obtained battery is deformed or an internal short circuit is caused. In order to avoid these, it is necessary to firmly fix the outermost end of the electrode plate group.
【００１２】しかし、従来、極板群最外周の末端部を強
固に固定し、極板群を正常な状態に保ち、製造工程の信
頼性を高めるという配慮が不十分であった。例えば特開
平１０−２４１３７５号公報には、極板群の最外周の外
面に集電体の露出部を設け、これを電池ケースの内面と
接触させてケースを外部端子として利用する構成が開示
されている。また、同公報には、鉄やステンレス鋼を外
装材として用いる場合、極板群の最外周が負極になるよ
うに構成すること、アルミニウム、アルミニウム合金を
外装材といて用いる場合、極板群の最外周が正極になる
ように構成することが示されている。しかし、極板群の
固定については極板群の最外周をテープで固定する構成
が示されているにすぎない。最外周をテープで固定する
程度では、極板群の挿入時の摩擦で容易に固定部が破損
するものと思われる。さらに最外周とケースとの間に絶
縁性のテープが存在すると、最外周の集電体露出部とケ
ースとの接触が阻害されたり、電池の幅が増してしま
う。特に、フィルムパッケージ方式の薄型電池において
は、固定用テープの存在が電池の厚さに与える影響は大
きい。However, conventionally, there has been insufficient consideration to firmly fix the outermost end portion of the electrode group to keep the electrode group in a normal state and to enhance the reliability of the manufacturing process. For example, Japanese Patent Application Laid-Open No. H10-241375 discloses a configuration in which an exposed portion of a current collector is provided on the outermost surface of the outermost periphery of an electrode plate group, and this is brought into contact with the inner surface of a battery case to use the case as an external terminal. ing. In addition, the same publication discloses that when iron or stainless steel is used as an exterior material, the outermost periphery of the electrode group is configured to be a negative electrode, and when aluminum or an aluminum alloy is used as an exterior material, It is shown that the outer periphery is configured to be a positive electrode. However, as for fixing the electrode plate group, only a configuration in which the outermost periphery of the electrode plate group is fixed with a tape is shown. To the extent that the outermost periphery is fixed with tape, it is considered that the fixing portion is easily damaged by friction when the electrode group is inserted. Furthermore, if an insulating tape exists between the outermost periphery and the case, contact between the outermost current collector exposed portion and the case is hindered, and the width of the battery increases. In particular, in the case of a thin battery of a film package type, the presence of the fixing tape greatly affects the thickness of the battery.
【００１３】また、特開平１０−５０２７２号公報、特
開平６−１６３０２５号公報には、円筒状に巻回され、
加圧された断面が長楕円形の渦巻状極板群を、断面が矩
形の電池ケースに挿入する構成が示されている。ここで
は極板群の最外周が正極で構成されており、極板群はア
ルミニウム製の電池ケースに挿入されている。また、最
外周に位置する正極の末端部において正極合剤を脱落さ
せて、芯体である集電体の一部を露出させている。そし
て、集電体の露出部と電池ケースの内壁とを接触させる
ことにより、正極のタブリードが省略されている。しか
しながら、極板群がどのように固定されているかについ
ては示されていない。[0013] Further, Japanese Patent Application Laid-Open Nos. 10-50272 and 6-163025 disclose a method of winding a cylinder.
A configuration is shown in which a pressurized spiral electrode group having an oblong cross section is inserted into a battery case having a rectangular cross section. Here, the outermost periphery of the electrode group is formed of a positive electrode, and the electrode group is inserted into an aluminum battery case. In addition, the positive electrode mixture is dropped off at the end of the positive electrode located at the outermost periphery to expose a part of the current collector serving as the core. By contacting the exposed portion of the current collector with the inner wall of the battery case, the tab lead of the positive electrode is omitted. However, it does not show how the electrode group is fixed.
【００１４】特開平６−１５０９７２には、扁平状の極
板群の最外周をセパレータで固定してケースに挿入する
ことが記載されているが、極板を固定することについて
の記載はない。強度の弱いセパレータを固定材とする上
記構成は、挿入時の摩擦に堪えることは困難と思われ
る。Japanese Patent Application Laid-Open No. 6-150972 describes that the outermost periphery of a flat electrode plate group is fixed to a separator and inserted into a case, but there is no description about fixing the electrode plate. It is considered that the above-described configuration using a weak separator as a fixing material is difficult to withstand friction during insertion.
【００１５】特開平１０−２２８８８号公報には、同じ
く扁平状の極板群を断面が矩形の電池ケースに挿入する
構成が示されている。ここでは極板群の最外周が負極で
構成されており、極板群はアルミニウム以外の金属で被
覆されたアルミニウムまたはアルミニウム合金の電池ケ
ースに挿入されている。しかしながら極板群の固定につ
いては言及されていない。Japanese Patent Application Laid-Open No. 10-22888 discloses a configuration in which a flat electrode group is inserted into a battery case having a rectangular cross section. Here, the outermost periphery of the electrode group is formed of a negative electrode, and the electrode group is inserted into a battery case made of aluminum or an aluminum alloy coated with a metal other than aluminum. However, there is no mention of fixing the electrode group.
【００１６】上記のように、従来技術では、極板群最外
周の末端部の固定については軟弱なセパレータをテープ
で固定する程度の方法しか開示されていないのが現状で
ある。従来技術にはコンパクトかつ効果的に極板群を固
定する技術は見い出されない。As described above, in the prior art, at present, only a method of fixing a soft separator with a tape is disclosed for fixing the outermost end portion of the electrode plate group. No technique for fixing the electrode group compactly and effectively in the prior art has been found.
【００１７】[0017]
【発明が解決しようとする課題】本発明は、寸法が小さ
く、ケースへの収納効率が高く、コンパクトに固定され
た極板群を実現し、コンパクトな電池設計を可能にする
ことを目的とする。また、本発明は、極板群が電池ケー
スに挿入される際の摩擦を軽減することを目的とする。
さらに、本発明は、極板群の外面とケース内壁との間の
接触を阻害する要素を排除し、信頼性の高い非水電解質
二次電池を提供することを目的とする。SUMMARY OF THE INVENTION An object of the present invention is to realize a compact fixed electrode group having a small size, high storage efficiency in a case, and a compact battery design. . Another object of the present invention is to reduce friction when the electrode group is inserted into the battery case.
A further object of the present invention is to provide a highly reliable non-aqueous electrolyte secondary battery by eliminating an element that hinders contact between the outer surface of the electrode group and the inner wall of the case.
【００１８】[0018]
【課題を解決するための手段】本発明は、正極と負極と
をセパレータを介して巻回した渦巻状の極板群を備え、
その極板群は、最外周を構成する極板の少なくとも最外
周末端部近傍に集電体が露出する部位を備え、さらにそ
の集電体露出部の内面が対面する一回り内側の同極性の
極板の外面に集電体が露出する部位を備え、前記末端部
近傍の集電体露出部内面と前記一回り内側の同極性の極
板の集電体露出部とが接合され、固定された構成を有す
る非水電解質二次電池およびその製造法に関する。According to the present invention, there is provided a spirally-shaped electrode group in which a positive electrode and a negative electrode are wound via a separator,
The electrode plate group has a portion where the current collector is exposed at least in the vicinity of the outermost peripheral end portion of the electrode plate constituting the outermost periphery, and furthermore, the inner surface of the current collector exposed portion has the same polarity on the inner side of the circuit where the current collector is exposed. A portion where the current collector is exposed on the outer surface of the electrode plate is provided, and the current collector exposed portion inner surface near the terminal portion and the current collector exposed portion of the same polarity electrode plate around the one end are joined and fixed. And a method of manufacturing the same.
【００１９】すなわち、本発明は、それぞれ電極合剤お
よびそれを支持する集電体からなる第１の極板および第
２の極板、ならびに前記第１の極板と第２の極板との間
に介在するセパレータからなり、前記第１の極板、セパ
レータおよび第２の極板は、第１の極板が第２の極板の
外側に配されるように渦巻状に巻回されている極板群を
有する非水電解質二次電池であって、前記極板群の最外
周に位置する第１の極板の末端部は、前記セパレータの
末端部および前記第２の極板の末端部上を通り越えて一
回り内側の第１の極板上に位置し、前記第１の極板の末
端部近傍の内面およびそこと対面する第１の極板の外面
には、第１の極板の集電体が露出しており、その露出部
同士が互いに接合されている非水電解質二次電池に関す
る。That is, the present invention provides a first electrode plate and a second electrode plate each comprising an electrode mixture and a current collector supporting the electrode mixture, and a method for forming the first electrode plate and the second electrode plate. The first electrode plate, the separator and the second electrode plate are spirally wound such that the first electrode plate is arranged outside the second electrode plate. A non-aqueous electrolyte secondary battery having an electrode group, wherein an end of a first electrode located at an outermost periphery of the electrode group is an end of the separator and an end of the second electrode. The first electrode plate is located on the first electrode plate, which is located on the inner side of the first electrode plate, and has an inner surface near the distal end of the first electrode plate and an outer surface of the first electrode plate facing the first electrode plate. The present invention relates to a nonaqueous electrolyte secondary battery in which a current collector of an electrode plate is exposed and the exposed portions are joined to each other.
【００２０】本発明は、また、前記第１の極板の末端部
近傍の外面にも、第１の極板の集電体が露出している非
水電解質二次電池、および前記極板群の最外周の外面全
体に第１の極板の集電体が露出している非水電解質二次
電池に関する。ここで、前記第１の極板が負極板の場
合、本発明の非水電解質二次電池は、鉄もしくは鉄合金
からなる電池ケース、または鉄もしくは鉄合金からなり
内面にニッケルメッキを有する電池ケースを有し、前記
極板群の最外周に位置する第１の極板、すなわち負極の
外面の集電体露出部が前記電池ケースと電気的に接続さ
れていることが好ましい。また、前記第１の極板が正極
板の場合、本発明の非水電解質二次電池は、アルミニウ
ムまたはアルミニウム合金からなる電池ケースを有し、
前記極板群の最外周に位置する第１の極板、すなわち正
極の外面の集電体露出部が前記電池ケースと電気的に接
続されていることが好ましい。The present invention also provides a non-aqueous electrolyte secondary battery in which the current collector of the first electrode plate is also exposed on the outer surface near the end of the first electrode plate, and the electrode group. The present invention relates to a non-aqueous electrolyte secondary battery in which the current collector of the first electrode plate is exposed on the entire outer surface of the outermost periphery. Here, when the first electrode plate is a negative electrode plate, the nonaqueous electrolyte secondary battery of the present invention is a battery case made of iron or an iron alloy, or a battery case made of iron or an iron alloy and having a nickel plating on the inner surface. It is preferable that the first electrode plate located at the outermost periphery of the electrode plate group, that is, the current collector exposed portion on the outer surface of the negative electrode is electrically connected to the battery case. Further, when the first electrode plate is a positive electrode plate, the nonaqueous electrolyte secondary battery of the present invention has a battery case made of aluminum or an aluminum alloy,
It is preferable that a first electrode plate located at the outermost periphery of the electrode plate group, that is, a current collector exposed portion on the outer surface of the positive electrode is electrically connected to the battery case.
【００２１】本発明は、また、前記第１の極板の末端部
近傍の一部が切除されている非水電解質二次電池に関す
る。ここで、前記第１の極板の末端部近傍は、窓部を有
する枠状に形成されていることが好ましい。本発明は、
また、前記第１の極板の末端部近傍の幅が、他の部位よ
り狭くなっている非水電解質二次電池に関する。本発明
は、また、前記第１の極板の末端部近傍の内面およびそ
こと対面する第１の極板の外面の集電体の露出部が、リ
ードを挟んで互いに溶接により接合されている非水電解
質二次電池に関する。The present invention also relates to a non-aqueous electrolyte secondary battery in which a part of the first electrode plate near the end is cut off. Here, it is preferable that the vicinity of the end of the first electrode plate is formed in a frame shape having a window. The present invention
Further, the present invention relates to a non-aqueous electrolyte secondary battery in which the width near the end of the first electrode plate is narrower than other portions. In the present invention, the inner surface near the end of the first electrode plate and the exposed portion of the current collector on the outer surface of the first electrode plate facing the inner surface are welded to each other with the lead interposed therebetween. The present invention relates to a non-aqueous electrolyte secondary battery.
【００２２】本発明は、また、前記極板群が、それに接
続された端子が導出された状態で、樹脂フィルムまたは
少なくとも一方の面に樹脂層を有する金属箔からなる外
装体により密封されている非水電解質二次電池に関す
る。ここで、前記金属箔は、アルミニウム箔、アルミニ
ウム合金箔、鉄箔、鉄合金箔またはニッケルメッキを有
する鉄箔であることが好ましい。According to the present invention, the electrode plate group is sealed by a package made of a resin film or a metal foil having a resin layer on at least one surface in a state where terminals connected to the electrode group are led out. The present invention relates to a non-aqueous electrolyte secondary battery. Here, it is preferable that the metal foil is an aluminum foil, an aluminum alloy foil, an iron foil, an iron alloy foil, or an iron foil having nickel plating.
【００２３】本発明は、さらに、帯状集電体に電極合剤
を支持させることにより第１の極板を得る工程であっ
て、少なくとも一方の末端部近傍の両面および前記末端
部から一定距離を置いた位置の片面に集電体の露出部が
残るように前記帯状集電体に電極合剤を塗布する工程、
別の帯状集電体に別の電極合剤を支持させることにより
第２の極板を得る工程、前記第１の極板と第２の極板と
の間にセパレータを介在させて、第１の極板が第２の極
板の外側に配されるように、かつ、最外周に前記一方の
末端部近傍の集電体露出部が位置し、その露出部がセパ
レータの末端部および第２の極板の末端部上を通り越え
て前記末端部から一定距離を置いた位置の集電体露出部
上に位置するように渦巻状に巻回することにより、極板
群を得る工程、および対面する集電体の露出部同士を互
いに接合する工程を有する非水電解質二次電池の製造法
に関する。The present invention further comprises a step of obtaining a first electrode plate by supporting the electrode mixture on the strip-shaped current collector, wherein the first electrode plate is provided with a certain distance from both surfaces near at least one end and the end. A step of applying an electrode mixture to the band-shaped current collector so that an exposed portion of the current collector remains on one surface of the placed position,
A step of obtaining a second electrode plate by supporting another electrode mixture on another band-shaped current collector, by interposing a separator between the first electrode plate and the second electrode plate, The current collector exposed portion near the one end is located at the outermost periphery so that the electrode plate is disposed outside the second electrode plate, and the exposed portion is located at the end of the separator and the second end. A step of obtaining an electrode group by spirally winding so as to be located on the current collector exposed portion at a position at a fixed distance from the end portion beyond the end portion of the electrode plate, and The present invention relates to a method for manufacturing a nonaqueous electrolyte secondary battery including a step of joining exposed portions of a current collector facing each other to each other.
【００２４】ここで、対面する集電体の露出部の接合
は、スポット溶接、超音波溶接またはレーザ溶接により
行うことが好ましい。あるいは、対面する集電体の露出
部の接合は、ゴム成分またはシアノアクリレート基を有
する成分を含有する接着剤により行うことが好ましい。Here, the joining of the exposed portions of the current collector facing each other is preferably performed by spot welding, ultrasonic welding or laser welding. Alternatively, the joining of the exposed portions of the current collector facing each other is preferably performed with an adhesive containing a rubber component or a component having a cyanoacrylate group.
【００２５】本発明は、さらに、対面する集電体の露出
部を互いに接合する工程が、前記露出部の少なくとも一
方に接着剤を塗布し、露出部同士を貼り合わせ、７０〜
１００℃で加熱しながら加圧する工程である非水電解質
二次電池の製造法に関する。In the present invention, the step of bonding the exposed portions of the current collector facing each other may include applying an adhesive to at least one of the exposed portions and bonding the exposed portions together.
The present invention relates to a method for producing a non-aqueous electrolyte secondary battery, which is a step of applying pressure while heating at 100 ° C.
【００２６】[0026]
【発明の実施の形態】本発明は、上記のごとく、極板群
の最外周を構成する極板の少なくとも末端部近傍の集電
体露出部で、対面する集電体同士が接合された構成を有
する。すなわち、極板群の最外周には、電池機能を阻害
する絶縁材料を用いないので、寸法と収納効率の損失が
ない。DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the present invention relates to a structure in which facing current collectors are joined at least at the exposed portion of the current collector near the end of the electrode plate constituting the outermost periphery of the electrode plate group. Having. That is, since the outermost periphery of the electrode group is not made of an insulating material that impairs the battery function, there is no loss in size and storage efficiency.
【００２７】極板群は強固に固定されているので、極板
群が緩むことはなく、ケースへの挿入に伴う強い摩擦力
に対しても、定められた形状が損なわれる危険性はなく
なる。したがって、従来のテープによる固定等に比べ、
製造工程の作業性は顕著に向上する。Since the electrode group is firmly fixed, the electrode group is not loosened, and there is no danger that the predetermined shape is damaged even by a strong frictional force accompanying insertion into the case. Therefore, compared to the conventional fixing with tape, etc.
Workability in the manufacturing process is significantly improved.
【００２８】極板の破損、破損部の巻き込みやせり上が
り、ならびに挿入された極板群のゆがみやひずみが発生
する危険性も激減する。その結果、微小短絡も減少す
る。さらに固定は対面する集電体露出部間で行なわれる
ので、最外周の極板の集電体とケースの内壁との間を接
触させ、ケースを外部端子に利用する電池構成では、上
記接触を妨げるものがなく、内部抵抗は極めて低くな
る。The risk of breakage of the electrode plate, entanglement or rise of the damaged portion, and distortion or distortion of the inserted electrode plate group are drastically reduced. As a result, micro short circuits are also reduced. Further, since the fixation is performed between the current collector exposed portions facing each other, the contact is made between the current collector of the outermost electrode plate and the inner wall of the case, and in the battery configuration using the case as an external terminal, the above-mentioned contact is made. Unobstructed, the internal resistance is extremely low.
【００２９】実施の形態１ 図１は、本発明の実施の形態１に係る扁平形の非水電解
質二次電池が有する極板群の横断面図である。図１に示
す極板群１は、その最外周を構成する極板２、極板２の
対極３、ならびに極板２と３との間に介在するセパレー
タ４から構成されている。Embodiment 1 FIG. 1 is a cross-sectional view of an electrode group included in a flat nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention. The electrode plate group 1 shown in FIG. 1 includes an electrode plate 2 constituting the outermost periphery thereof, a counter electrode 3 of the electrode plate 2, and a separator 4 interposed between the electrode plates 2 and 3.
【００３０】図２は、図１に示した極板群１を構成する
極板２の末端部２ａを含む一部の構造を示しており、実
施の形態１に係る極板群の最外周外面に対応する第１の
極板の上面図（ａ）およびそのＩ−Ｉ線における断面図
（ｂ）である。極板２の末端部近傍の両面には活物質を
含む合剤層６を有さない集電体露出部７および８が設け
られており、露出部８が対面することとなる１回り内側
の同極板の位置には、同じく集電体露出部９が設けられ
ている。FIG. 2 shows a part of the structure including the end portion 2a of the electrode plate 2 constituting the electrode plate group 1 shown in FIG. 1, and the outermost peripheral surface of the electrode plate group according to the first embodiment. FIG. 1A is a top view of a first electrode plate corresponding to FIG. 1A and FIG. 1B is a cross-sectional view taken along line II of FIG. Current collector exposed portions 7 and 8 having no active material-containing mixture layer 6 are provided on both surfaces near the end portion of the electrode plate 2. A current collector exposed portion 9 is also provided at the position of the same polar plate.
【００３１】図１において、極板２の末端部２ａは、対
極３の末端部３ａおよびセパレータ４の末端部４ａをこ
えて、極板群の１回り内側を構成する同極板上に張り出
している。末端部２ａの内側の集電体露出部８は対面す
る露出部９と接合される。露出部８と９との接合は、溶
接、接着剤などによって行われる。集電体露出部の接合
は、必ずしも極板の幅全体で行う必要はない。対面する
露出部の一部が強固に接合されていればよい。In FIG. 1, the terminal portion 2a of the electrode plate 2 extends beyond the terminal portion 3a of the counter electrode 3 and the terminal portion 4a of the separator 4 onto the same electrode plate which constitutes one inside of the electrode plate group. I have. The current collector exposed portion 8 inside the end portion 2a is joined to the facing exposed portion 9. The joining between the exposed portions 8 and 9 is performed by welding, an adhesive, or the like. It is not always necessary to join the exposed portion of the current collector over the entire width of the electrode plate. It suffices that a part of the facing exposed portion is firmly joined.
【００３２】実施の形態２ 図３は、本発明の実施の形態２に係る非水電解質二次電
池が有する極板群１の最外周末端部２ａを固定していな
い状態の斜視図である。図３は合剤層を有する極板２の
外面または両面に合剤層を有さない集電体露出部７を長
く設け、その集電体露出部７を１回り以上周回させた状
態であり、結果として最外周の外面全体で集電体が露出
している。集電体露出部７の末端部は、セパレータ４の
末端部４ａを越えて、１回り内側の集電体露出部と対面
させて固定される。極板２の対極には、巻回する前に、
予めタブリード１２を接続しておくことが好ましい。Embodiment 2 FIG. 3 is a perspective view of a non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention in a state where an outermost peripheral end portion 2a of an electrode plate group 1 is not fixed. FIG. 3 shows a state in which a long current collector exposed portion 7 having no mixture layer is provided on the outer surface or both surfaces of the electrode plate 2 having the mixture layer, and the current collector exposed portion 7 is rotated one or more times. As a result, the current collector is exposed on the entire outer surface of the outermost periphery. The end portion of the current collector exposed portion 7 is fixed so as to face the current collector exposed portion which is one turn inside and beyond the end portion 4a of the separator 4. Before winding on the opposite electrode of the electrode plate 2,
It is preferable to connect the tab lead 12 in advance.
【００３３】このような構成は、第２の極板と対向せ
ず、容量に寄与しない第１の極板の合剤を削減できる。
また、テープやセパレータなどを用いて最外周で極板の
末端部を固定する場合に比べて、極板群の挿入時におけ
る極板群と電池ケースとの間の抵抗が極めて小さく、作
業性が改善される。また、極板群の最外周外面と電池ケ
ース内面との間にテープやセパレータが存在しないの
で、内部抵抗の小さな電池を得ることができる。また、
極板群に不均一な圧力がかかることがないので、電池の
信頼性を高く維持できる。Such a configuration can reduce the amount of the mixture of the first electrode plate which does not face the second electrode plate and does not contribute to the capacity.
In addition, the resistance between the electrode group and the battery case when the electrode group is inserted is extremely small compared to the case where the end of the electrode plate is fixed at the outermost periphery using a tape or a separator, and workability is improved. Be improved. Further, since there is no tape or separator between the outermost outer surface of the electrode group and the inner surface of the battery case, a battery having a small internal resistance can be obtained. Also,
Since uneven pressure is not applied to the electrode group, the reliability of the battery can be maintained high.
【００３４】図４は、実施の形態２に係る極板群１の最
外周外面に対応する第１の極板２の上面図（ａ）および
そのII−II線における断面図（ｂ）である。この極板
は、その末端部から極板群の最外周に対応する範囲より
も広い範囲にわたって、外側となる片面に合剤層を有さ
ない集電体露出部７を有する。また、極板２の内側の集
電体露出部８もできるだけ広くすることが好ましい。こ
のような極板では、対極に対面しない部位の活物質を省
略することができる。また、集電体露出部の接合の作業
性も向上する。FIG. 4 is a top view (a) of the first electrode plate 2 corresponding to the outermost peripheral surface of the electrode plate group 1 according to the second embodiment, and a cross-sectional view thereof along line II-II (b). . This electrode plate has a current collector exposed portion 7 having no mixture layer on one outer surface over a range wider than a range corresponding to the outermost periphery of the electrode plate group from its end. In addition, it is preferable that the current collector exposed portion 8 inside the electrode plate 2 is made as wide as possible. In such an electrode plate, the active material in a portion not facing the counter electrode can be omitted. In addition, the workability of joining the exposed portion of the current collector is improved.
【００３５】図５は、実施の形態２に係る別の極板群１
の最外周外面に対応する第１の極板の上面図（ａ）およ
びそのIII−III線における断面図（ｂ）である。この極
板は、その末端部から極板群の最外周に対応する範囲よ
りも広い範囲にわたって両面に合剤層を有さない集電体
露出部７および８を有する。このような極板は作製が容
易であり、活物質も無駄にならない。FIG. 5 shows another electrode group 1 according to the second embodiment.
FIG. 3A is a top view of the first electrode plate corresponding to the outermost peripheral surface of FIG. 3A and FIG. 3B is a cross-sectional view taken along line III-III of FIG. This electrode plate has current collector exposed portions 7 and 8 having no mixture layer on both sides over a range wider than a range corresponding to the outermost periphery of the electrode plate group from the end portion. Such an electrode plate is easy to manufacture, and the active material is not wasted.
【００３６】実施の形態３ 図６は、本発明の実施の形態３に係る非水電解質二次電
池が有する極板群１の最外周末端部２ａを固定していな
い状態の斜視図である。また、図７は、実施の形態３に
係る極板群の最外周に対応する第１の極板２の上面図
（ａ）およびそのIV−IV線における断面図（ｂ）であ
る。図７に示す極板は、図５に示す極板の集電体露出部
を枠状に切削し、窓部１０を形成したものである。この
ような極板を用い、枠部分に沿って露出部を接合すれ
ば、極板群の固定が一層強固となり、しかも軽量な電池
を得ることができる。Third Embodiment FIG. 6 is a perspective view of a non-aqueous electrolyte secondary battery according to a third embodiment of the present invention in a state where the outermost peripheral end portion 2a of the electrode plate group 1 is not fixed. FIG. 7 is a top view (a) of the first electrode plate 2 corresponding to the outermost periphery of the electrode plate group according to the third embodiment, and a cross-sectional view thereof along line IV-IV (b). The electrode plate shown in FIG. 7 is obtained by cutting a current collector exposed portion of the electrode plate shown in FIG. If such an electrode plate is used and the exposed portions are joined along the frame portion, the fixing of the electrode plate group is further strengthened, and a lightweight battery can be obtained.
【００３７】実施の形態４ 図８は本発明の実施の形態４に係る非水電解質二次電池
が有する極板群１の斜視図である。この極板群はタブリ
ード１１を有する。この極板群を用いれば、極板群外面
の集電体露出部と電池ケース内面との電気的接合に加え
てリード１１による接合が可能であり、電池の信頼性を
確実にすることができる。タブリード１１は、集電体の
露出部７に後付けしてもよく、予め極板の集電体露出部
７に溶接しておいてもよい。また、極板群を固定するた
めの集電体露出部７と８との溶接と同時にタブリードの
溶接を実施すれば、作業工程を低減することができる。
タブリードは極板群の最外周の集電体露出部のどの部分
に設けてもよい。例えば極板末端部の集電体露出部の外
側または内側にタブリードを設けることができる。Embodiment 4 FIG. 8 is a perspective view of an electrode group 1 of a nonaqueous electrolyte secondary battery according to Embodiment 4 of the present invention. This electrode plate group has a tab lead 11. If this electrode plate group is used, in addition to the electrical connection between the exposed portion of the current collector on the outer surface of the electrode plate group and the inner surface of the battery case, bonding by the lead 11 is possible, and the reliability of the battery can be ensured. . The tab lead 11 may be attached to the exposed portion 7 of the current collector, or may be welded to the exposed portion 7 of the electrode plate in advance. In addition, if welding of the tab lead is performed simultaneously with welding of the current collector exposed portions 7 and 8 for fixing the electrode plate group, the number of working steps can be reduced.
The tab lead may be provided at any part of the outermost current collector exposed portion of the electrode plate group. For example, a tab lead may be provided outside or inside the exposed portion of the current collector at the end of the electrode plate.
【００３８】次に、上記極板群の製造法について説明す
る。本発明の集電体露出部が対向する構造は、極板群の
形成工程のいずれかの時点で該当する位置の合剤層を除
去することによっても得ることができるが、図２、４、
５および７に示したように、予め対面することになる集
電体露出部を極板に形成しておくことが好ましい。なか
でも図４および５に示したような露出部を形成すること
が、極板の作製が容易であること、集電体露出部の位置
合わせが容易であることなどから、製造面での利点が多
い。Next, a method of manufacturing the above-mentioned electrode group will be described. The structure in which the current collector exposed portions of the present invention are opposed to each other can be obtained by removing the mixture layer at a corresponding position at any point in the electrode plate forming process.
As shown in FIGS. 5 and 7, it is preferable to previously form a current collector exposed portion to be faced on the electrode plate. Among them, the formation of the exposed portion as shown in FIGS. 4 and 5 is advantageous in terms of manufacturing because the electrode plate is easy to manufacture and the current collector exposed portion is easily aligned. There are many.
【００３９】極板に集電体露出部を設けるには、活物質
を含む合剤を塗布した後に合剤を除去する方法、集電体
の所定の位置をテープなどでマスキングしてから合剤を
塗布し、その後にテープを除去する方法、合剤を塗布す
るノズルの位置を調節する方法などが有効である。In order to provide a current collector exposed portion on the electrode plate, a method of applying a mixture containing an active material and then removing the mixture, masking a predetermined position of the current collector with a tape or the like, and then mixing the mixture with a tape Is effective, a method of removing the tape after that, and a method of adjusting the position of a nozzle for applying the mixture are effective.
【００４０】集電体が極板群の外面に露出している場
合、極板群の外部からスポット溶接、超音波溶接、レー
ザー溶接などによる露出部の強固な接合が可能である。
接合は、極板の末端部近傍に限らず、集電体露出部が対
面する任意の位置で行うことができる。極板群の最外周
の集電体の一部を任意の形状に打ち抜いて窓部を設け、
窓部の縁の部分を溶接すると一層強固な接合が可能であ
る。接合面には剥離したり崩れたりしやすい合剤層が存
在しないので、接合面に接着剤を付与して接合してもよ
い。接着剤としては、熱硬化性接着剤、ゴム成分を含む
接着剤、シアノアクリレート基を有する成分を含む速硬
化性接着剤を用いることが好ましい。接着剤の硬化に時
間を要する場合は、７０〜１００℃に加熱しながら数秒
間接合部を加圧することが有効である。どのような接合
法を採用しても、極板群の周囲には、最外周外面とケー
ス内面との接触を妨げたり、極板群に歪みを生じさせる
おそれのある絶縁性のテープのような材料が存在しない
ので、電池の信頼性が損なわれることはない。When the current collector is exposed on the outer surface of the electrode group, the exposed portion can be firmly joined by spot welding, ultrasonic welding, laser welding, or the like from outside the electrode group.
The joining is not limited to the vicinity of the end of the electrode plate, and can be performed at any position where the exposed portion of the current collector faces. A part of the outermost current collector of the electrode plate group is punched into an arbitrary shape to provide a window,
If the edge of the window is welded, stronger bonding is possible. Since there is no mixture layer that easily peels or collapses on the bonding surface, an adhesive may be applied to the bonding surface to perform bonding. As the adhesive, it is preferable to use a thermosetting adhesive, an adhesive containing a rubber component, or a quick-curing adhesive containing a component having a cyanoacrylate group. If it takes time to cure the adhesive, it is effective to press the joint for several seconds while heating to 70-100 ° C. Regardless of the joining method used, the circumference of the electrode group should not be in contact with the outermost outer surface and the inner surface of the case, or an insulating tape such as an insulating tape that may cause distortion in the electrode group. The absence of material does not compromise battery reliability.
【００４１】上記のように本発明の電池は、内部抵抗の
ばらつきを伴わずに極板群の最外周の集電体露出部をケ
ース内面に接触させることができるので、ケースを外部
端子として有効利用できる。具体的には、最外周が負極
板であり、ケースが鉄、鉄合金などの電池ケースである
場合、最外周が正極板であり、ケースがアルミニウム、
アルミニウム合金などの電池ケースである場合に、本発
明は特に有効である。なお、鉄、鉄合金のケース内面に
は、ニッケルメッキを設けることが好ましい。As described above, according to the battery of the present invention, the current collector exposed portion on the outermost periphery of the electrode plate group can be brought into contact with the inner surface of the case without variation in the internal resistance. Available. Specifically, when the outermost periphery is a negative electrode plate and the case is a battery case made of iron, iron alloy, or the like, the outermost periphery is a positive electrode plate, the case is aluminum,
The present invention is particularly effective when the battery case is made of an aluminum alloy or the like. In addition, it is preferable to provide nickel plating on the inner surface of the case made of iron or iron alloy.
【００４２】本発明は、極板群の固定方法を改善した点
に最大の特徴を有する。従って、電池ケースがフイルム
材料やチューブ材料からなるフイルムパッケージ方式の
電池にも本発明を適用できる。フイルムパッケージ方式
の電池は、厚さ、寸法の低減が重要視されるため、コン
パクトな極板群を用いる本発明の構成は有効である。フ
イルム材料、チューブ材料としては、少なくとも一方の
面に樹脂層を設けた金属箔が好ましい。ここで金属箔と
しては、アルミニウム箔、アルミニウム合金箔、鉄箔、
鉄合金箔、またはそれらにニッケルメッキを施したもの
が好ましい。樹脂層はポリオレフィンなどの熱可塑性樹
脂からなることが好ましい。樹脂層は金属箔の少なくと
も一方の面に形成されていればよい。本発明の固定構造
を適用する限りにおいて、フイルム材料の種類やその構
成、パッケージの仕方、電池の形状等、フイルムパッケ
ージ方式に関する諸条件は任意である。公知の技術は全
て本発明に適用することができる。The present invention is most characterized in that the method of fixing the electrode group is improved. Therefore, the present invention can be applied to a film package type battery in which the battery case is made of a film material or a tube material. The importance of reducing the thickness and dimensions of the film package type battery is important, so the configuration of the present invention using a compact electrode plate group is effective. As the film material and the tube material, a metal foil provided with a resin layer on at least one surface is preferable. Here, as the metal foil, aluminum foil, aluminum alloy foil, iron foil,
Iron alloy foils or those plated with nickel are preferred. The resin layer is preferably made of a thermoplastic resin such as polyolefin. The resin layer may be formed on at least one surface of the metal foil. As long as the fixing structure of the present invention is applied, various conditions relating to the film package system, such as the type and configuration of the film material, the packaging method, and the shape of the battery, are arbitrary. All known techniques can be applied to the present invention.
【００４３】本発明の固定構造を適用する限り、最外周
極板の極性、合剤中の活物質や添加剤の量および種類、
集電体、非水電解質およびセパレータの形態および種
類、電池ケースの材質および形状等により、本発明が限
定されることはない。As long as the fixing structure of the present invention is applied, the polarity of the outermost electrode plate, the amount and type of the active material and additives in the mixture,
The present invention is not limited by the form and type of the current collector, the non-aqueous electrolyte and the separator, the material and shape of the battery case, and the like.
【００４４】[0044]
【実施例】以下、実施例に基づいて、本発明を具体的に
説明する。 《実施例１》正極活物質としてのコバルト酸リチウム、
導電剤としてのアセチレンブラック、結着剤としてのポ
リテトラフルオロエチレン、増粘剤としてのカルボキシ
メチルセルロースを重量比１００：３：７：２で混合
し、水を分散媒とするスラリー状の正極合剤を得た。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. << Example 1 >> Lithium cobalt oxide as a positive electrode active material,
A slurry-type positive electrode mixture in which acetylene black as a conductive agent, polytetrafluoroethylene as a binder, and carboxymethyl cellulose as a thickener are mixed at a weight ratio of 100: 3: 7: 2, and water is used as a dispersion medium. I got
【００４５】正極の集電体としてはアルミニウム箔（厚
さ２０μｍ、幅４２ｍｍ）を用いた。集電体の露出部と
なる部分を樹脂製のテープでマスキングした後、正極合
剤を集電体の両面に塗布し、正極シートを得た。正極シ
ートは樹脂製のテープを除去した後、乾燥し、厚さ１５
０μｍにプレスし、所定の形状（長さ４７０ｍｍ、幅４
２ｍｍ）に裁断し、図４に示すような正極板を得た。正
極板の一方の面には端部から１１０ｍｍの長さにわたっ
て集電体の露出部を設け、他方の面には端部から４０ｍ
ｍの長さにわたって集電体の露出部を設けた。この正極
板を極板群の最外周を構成する極板として用いれば、少
なくとも極板群の外面全体に正極集電体の露出部を設け
ることができる。An aluminum foil (thickness: 20 μm, width: 42 mm) was used as a current collector for the positive electrode. After masking the exposed portion of the current collector with a resin tape, a positive electrode mixture was applied to both surfaces of the current collector to obtain a positive electrode sheet. After removing the resin tape, the positive electrode sheet was dried to a thickness of 15 mm.
Pressed to 0μm, and the shape (length 470mm, width 4)
2 mm) to obtain a positive electrode plate as shown in FIG. An exposed portion of the current collector is provided on one surface of the positive electrode plate over a length of 110 mm from the end, and 40 m from the end on the other surface.
The exposed portion of the current collector was provided over a length of m. If this positive electrode plate is used as the electrode plate constituting the outermost periphery of the electrode plate group, an exposed portion of the positive electrode current collector can be provided on at least the entire outer surface of the electrode plate group.
【００４６】活物質としての黒鉛化メソカーボンマイク
ロビーズ、結着剤としてのスチレン−ブタジエンゴム、
増粘剤としてのカルボキシメチルセルロースを重量比１
００：２：１で混合し、水を分散媒とするスラリー状の
負極合剤を得た。負極集電体としては銅箔（厚さ１０μ
ｍ、幅４４ｍｍ）を用いた。負極集電体の両面に負極合
剤を塗布し、負極シートを得た。負極シートは、乾燥
し、厚さ１４０μｍにプレスし、所定の形状（長さ４５
０ｍｍ、幅４４ｍｍ）に裁断して負極板を得た。負極板
の所定の箇所にはニッケル製のタブリードを超音波で溶
接した。Graphitized mesocarbon microbeads as an active material, styrene-butadiene rubber as a binder,
Carboxymethylcellulose as a thickener at a weight ratio of 1
The mixture was mixed at 00: 2: 1 to obtain a slurry-like negative electrode mixture using water as a dispersion medium. Copper foil (thickness 10μ)
m, width 44 mm). A negative electrode mixture was applied to both surfaces of the negative electrode current collector to obtain a negative electrode sheet. The negative electrode sheet is dried, pressed to a thickness of 140 μm, and formed into a predetermined shape (length 45 mm).
(0 mm, width 44 mm) to obtain a negative electrode plate. A tab lead made of nickel was welded to a predetermined portion of the negative electrode plate by ultrasonic waves.
【００４７】得られた正極板と負極板を、長さ５００ｍ
ｍのポリエチレン製微多孔膜であるセパレータを介し
て、長さ１１０ｍｍの正極集電体の露出部が最外周の外
面となるように巻回し、最外周の端部が固定されていな
い状態の図３に示すような極板群Ｓを得た。極板群Ｓ
は、幅３２ｍｍ、厚さ５ｍｍ、高さ４６ｍｍであり、そ
の最外周外面全体に正極集電体の露出部を有する。ま
た、正極板は、極板群Ｓの最外周端部近傍において、セ
パレータおよび負極板の端部をこえて張り出し、張り出
した部位の内面、その部位と対面する同極板の外面に
は、正極集電体が露出している。The obtained positive electrode plate and negative electrode plate were 500 m in length.
m through a separator which is a polyethylene microporous membrane with a length of 110 mm and wound so that the exposed portion of the positive electrode current collector having a length of 110 mm is the outermost peripheral surface, and the outermost peripheral end is not fixed. An electrode group S as shown in FIG. Electrode group S
Has a width of 32 mm, a thickness of 5 mm, and a height of 46 mm, and has an exposed portion of the positive electrode current collector on the entire outermost peripheral surface thereof. Further, the positive electrode plate protrudes beyond the ends of the separator and the negative electrode plate in the vicinity of the outermost peripheral end of the electrode plate group S, and the inner surface of the protruding portion and the outer surface of the same polar plate facing the portion have a positive electrode. Current collector is exposed.
【００４８】正極集電体の露出部には、厚さ０．２ｍｍ
のタブリードを溶接した。そして、端部近傍の集電体露
出部の内面と、その部位と対面する集電体露出部との間
にイソブチルゴムを付与し、硬化させ、最外周が固定さ
れた極板群を得た。The exposed portion of the positive electrode current collector has a thickness of 0.2 mm.
The tab lead was welded. Then, isobutyl rubber was applied between the inner surface of the exposed portion of the current collector near the end and the exposed portion of the current collector facing the portion, and cured to obtain an electrode plate group having the outermost periphery fixed. .
【００４９】得られた極板群は、側面から１０ｋｇｆの
圧力を加え、さらに扁平状にした。そして、外寸が幅３
４ｍｍ、高さ５０ｍｍ、厚さ３ｍｍであり、内寸の厚さ
が２．１ｍｍのアルミニウム製の角型ケースに極板群を
挿入した。The obtained electrode group was further flattened by applying a pressure of 10 kgf from the side. And the outside dimension is width 3
The electrode group was inserted into an aluminum square case having a size of 4 mm, a height of 50 mm, a thickness of 3 mm, and an inner thickness of 2.1 mm.
【００５０】極板群をケースに挿入後、非水電解質を注
入した。非水電解質は、エチレンカーボネートとジエチ
ルカーボネートを体積比１：１の割合で混合した溶媒
に、六フッ化燐酸リチウムを１．０ｍｏｌ／リットルの
割合で溶解したものである。正極のタブリードはケース
の内壁に接続した。負極のタブリードは外部端子と安全
弁を有する封口板に接続した。そして、封口板でケース
を封口して非水電解質二次電池を完成した。After inserting the electrode group into the case, a non-aqueous electrolyte was injected. The non-aqueous electrolyte is obtained by dissolving lithium hexafluorophosphate at a ratio of 1.0 mol / liter in a solvent in which ethylene carbonate and diethyl carbonate are mixed at a volume ratio of 1: 1. The tab lead of the positive electrode was connected to the inner wall of the case. The tab lead of the negative electrode was connected to a sealing plate having an external terminal and a safety valve. Then, the case was sealed with a sealing plate to complete a non-aqueous electrolyte secondary battery.
【００５１】《比較例１》極板群Ｓの最外周をイソブチ
ルゴムで固定せずに、厚さ０．１ｍｍの接着剤を有する
テープを極板群Ｓの最外周に貼り付けた。それ以外は、
実施例１と同様に非水電解質二次電池を組み立てた。た
だし、ケースの外寸の厚さを３．２ｍｍ、内寸の厚さを
２．３ｍｍとした。Comparative Example 1 A tape having an adhesive having a thickness of 0.1 mm was attached to the outermost periphery of the electrode plate group S without fixing the outermost periphery of the electrode plate group S with isobutyl rubber. Other than that,
A non-aqueous electrolyte secondary battery was assembled in the same manner as in Example 1. However, the thickness of the outer dimension of the case was 3.2 mm, and the thickness of the inner dimension was 2.3 mm.
【００５２】《実施例２》正極板にはタブリードを設け
なかったこと以外、実施例Ａと同様に非水電解質二次電
池を組み立てた。ただし、ケースの外寸の厚さを２．８
ｍｍ、内寸の厚さを１．９ｍｍとした。Example 2 A non-aqueous electrolyte secondary battery was assembled in the same manner as in Example A, except that no tab lead was provided on the positive electrode plate. However, the outer thickness of the case is 2.8.
mm, and the thickness of the inner dimension was 1.9 mm.
【００５３】《実施例３》イソブチルゴムを、９０℃で
加熱し、６００ｋｇｆの荷重を加えながら硬化させたこ
と以外、実施例１と同様に非水電解質二次電池を組み立
てた。Example 3 A non-aqueous electrolyte secondary battery was assembled in the same manner as in Example 1, except that the isobutyl rubber was heated at 90 ° C. and cured while applying a load of 600 kgf.
【００５４】《実施例４》正極板用のタブリードを極板
群Ｓの最外周の集電体露出部に配し、極板群の最外周外
面側から超音波を用いてリードの溶接および対面する集
電体露出部間の溶接を同時に行なった。それ以外は、実
施例１と実施例１と同様に非水電解質二次電池を組み立
てた。Example 4 A tab lead for a positive electrode plate is arranged on the exposed portion of the outermost collector of the electrode plate group S, and welding and facing of the lead are performed using ultrasonic waves from the outermost peripheral surface of the electrode plate group. Welding between the exposed portions of the current collector was performed at the same time. Otherwise, a non-aqueous electrolyte secondary battery was assembled in the same manner as in Example 1 and Example 1.
【００５５】表１に実施例１〜４および比較例１で得ら
れた扁平状の極板群の厚さ、および電池の外寸の厚さを
まとめて示す。Table 1 collectively shows the thickness of the flat electrode group obtained in Examples 1 to 4 and Comparative Example 1, and the external thickness of the battery.
【００５６】[0056]
【表１】 [Table 1]
【００５７】実施例１と比較例１の対比から明らかな様
に、同じ極板を用い、同様の極板構成であっても、極板
群の最外周外面にテープを配する場合、テープの厚さ分
だけ極板群の最終的な厚さが増大することがわかる。ま
た、テープの剥がれやズレを防ぐためには、内寸の厚さ
が大きなケースが必要になると考えられる。一方、本発
明の実施例の電池はいずれも比較例の電池に比べて厚さ
が抑えられている。実施例２と他の実施例の電池との比
較からは、タブリードを省略すれば、電池を一層薄くで
きることがわかる。As is clear from the comparison between Example 1 and Comparative Example 1, even if the same electrode plate is used and the same electrode plate structure is used, when the tape is arranged on the outermost peripheral surface of the electrode plate group, It can be seen that the final thickness of the electrode group increases by the thickness. Further, in order to prevent the tape from peeling or shifting, it is considered that a case having a large inner thickness is required. On the other hand, the thickness of each of the batteries according to the examples of the present invention is smaller than that of the battery according to the comparative example. A comparison between the battery of Example 2 and the batteries of the other examples indicates that the battery can be made thinner if the tab lead is omitted.
【００５８】本発明には、極板群をケースに挿入する時
の作業性と信頼性が向上するという効果もある。すなわ
ち、最外周外面にテープを有する極板群をケースに圧入
すると、テープとケース内壁との摩擦でテープがめくれ
上がり、電池に異常な膨らみを生じたり、極板の一部を
破損したり、内部短絡を生じたりする可能性がある。こ
れらのトラブルは極板群のケースへの挿入速度が増すに
伴い増大する。一方、本発明の電池はこれらのトラブル
を生じない。The present invention also has the effect of improving workability and reliability when inserting the electrode plate group into the case. That is, when the electrode group having a tape on the outermost outer surface is pressed into the case, the tape is turned up by friction between the tape and the inner wall of the case, causing an abnormal swelling of the battery or damaging a part of the electrode plate, An internal short circuit may occur. These troubles increase as the speed of inserting the electrode group into the case increases. On the other hand, the battery of the present invention does not cause these troubles.
【００５９】次に、電池特性について述べる。 （ｉ）放電容量 表２は実施例１の電池と実施例２の電池を２０℃で０．
２Ｃ、１Ｃおよび２Ｃの電流値でそれぞれ放電した時の
放電容量を示している。ただし、放電容量は実施例１の
電池を０．２Ｃの電流値で放電したときの容量を１００
とする相対値で示した。Next, battery characteristics will be described. (I) Discharge capacity Table 2 shows that the batteries of Example 1 and the battery of Example 2 were treated at 0 ° C at 20 ° C.
It shows the discharge capacity when discharging at current values of 2C, 1C and 2C, respectively. However, the discharge capacity was 100 when the battery of Example 1 was discharged at a current value of 0.2 C.
The relative values are shown below.
【００６０】[0060]
【表２】 [Table 2]
【００６１】表２において、集電体露出部と電池ケース
内面との接触による導通だけを有し、最外周の極板にタ
ブリードを有さないする実施例２の電池は、２Ｃ放電で
は若干低い容量を示したものの、１Ｃ放電と０．２Ｃ放
電では、タブリードを有する実施例１の電池と遜色のな
い特性を示している。また、高率放電特性を向上させる
にはタブリードを用いることが有効と考えられる。In Table 2, the battery of Example 2 having only conduction due to contact between the exposed portion of the current collector and the inner surface of the battery case and having no tab lead on the outermost electrode plate is slightly lower in 2C discharge. Although the capacity is shown, the 1C discharge and the 0.2C discharge show characteristics comparable to those of the battery of Example 1 having a tab lead. It is considered effective to use a tab lead to improve the high rate discharge characteristics.
【００６２】比較例１の電池においてタブリードを省略
した電池の作製を試みたが、特性がバラツキ、実用的な
容量が得られなかった。これは、集電体露出部と電池ケ
ース内面との接触による導通が、極板群の最外周に付さ
れたテープにより阻害されたためと考えられる。An attempt was made to manufacture the battery of Comparative Example 1 from which the tab lead was omitted, but the characteristics varied and a practical capacity was not obtained. It is considered that this is because conduction due to contact between the exposed portion of the current collector and the inner surface of the battery case was hindered by the tape attached to the outermost periphery of the electrode plate group.
【００６３】（ii）容量維持率 ２０℃で１Ｃの電流値で実施例１、３および４の電池の
充放電を５００回繰り返した。そして、初回に得られた
放電容量に対する５００回目に得られた放電容量の比率
を１００分率で求めた。結果を表３に示す。(Ii) Capacity Maintenance Rate The charge and discharge of the batteries of Examples 1, 3 and 4 were repeated 500 times at a current value of 1 C at 20 ° C. Then, the ratio of the discharge capacity obtained at the 500th time to the discharge capacity obtained at the first time was calculated as a percentage. Table 3 shows the results.
【００６４】[0064]
【表３】 [Table 3]
【００６５】表３に示すように、いずれの電池も高い容
量維持率を示している。このことは極板群の最外周端部
を対面する集電体露出部間を接合して固定した電池は高
い信頼性を備えることを示すものである。なかでも実施
例３と４の電池が優れた結果を示している。これは、極
板群の接合部が強固な程、ケースへの挿入時に極板群に
不均一な圧力がかかりにくく、その結果、局部的なデン
ドライトの析出が抑制されるためと考えられる。As shown in Table 3, each of the batteries has a high capacity retention ratio. This indicates that the battery fixed by bonding between the exposed portions of the current collector facing the outermost end of the electrode plate group has high reliability. Among them, the batteries of Examples 3 and 4 show excellent results. This is presumably because the stronger the bonding portion of the electrode group, the less uneven pressure is applied to the electrode group during insertion into the case. As a result, local dendrite deposition is suppressed.
【００６６】本発明の効果は、上記実施例で示した接着
剤の他、ゴム系やシアノアクリレート系などの接着剤を
適用しても同様に得られると考えられる。また、超音波
溶接の他、レーザ溶接、スポット溶接などを適用しても
同様である。It is considered that the effects of the present invention can be similarly obtained by applying a rubber-based or cyanoacrylate-based adhesive in addition to the adhesives shown in the above embodiments. The same applies to laser welding, spot welding and the like in addition to ultrasonic welding.
【００６７】[0067]
【発明の効果】本発明によれば、非水電解質二次電池の
製造工程において、極板群をケースに挿入する際の作業
性が改善される。また、従来よりもコンパクトかつ信頼
性に優れた非水電解質二次電池を得ることができる。According to the present invention, in the process of manufacturing a non-aqueous electrolyte secondary battery, the workability when inserting the electrode group into the case is improved. Further, a non-aqueous electrolyte secondary battery that is more compact and more reliable than conventional ones can be obtained.
【図１】本発明の実施の形態１に係る扁平形の非水電解
質二次電池が有する極板群の横断面図である。FIG. 1 is a cross-sectional view of an electrode group included in a flat nonaqueous electrolyte secondary battery according to Embodiment 1 of the present invention.
【図２】実施の形態１に係る極板群の最外周外面に対応
する第１の極板の上面図（ａ）およびそのＩ−Ｉ線にお
ける断面図（ｂ）である。FIGS. 2A and 2B are a top view of a first electrode plate corresponding to the outermost peripheral surface of the electrode plate group according to the first embodiment and a cross-sectional view taken along line II of FIG.
【図３】本発明の実施の形態２に係る非水電解質二次電
池が有する極板群の最外周末端部を固定していない状態
の斜視図である。FIG. 3 is a perspective view of a non-aqueous electrolyte secondary battery according to Embodiment 2 of the present invention in a state where an outermost peripheral end of an electrode group is not fixed.
【図４】実施の形態２に係る極板群の最外周外面に対応
する第１の極板の上面図（ａ）およびそのII−II線にお
ける断面図（ｂ）である。FIG. 4A is a top view of a first electrode plate corresponding to the outermost peripheral surface of the electrode group according to the second embodiment, and FIG. 4B is a sectional view taken along line II-II.
【図５】実施の形態２に係る別の極板群の最外周外面に
対応する第１の極板の上面図（ａ）およびそのIII−III
線における断面図（ｂ）である。FIG. 5A is a top view of the first electrode plate corresponding to the outermost peripheral surface of another electrode plate group according to the second embodiment, and its III-III view.
It is sectional drawing (b) in a line.
【図６】本発明の実施の形態３に係る非水電解質二次電
池が有する極板群の最外周末端部を固定していない状態
の斜視図である。FIG. 6 is a perspective view of a non-aqueous electrolyte secondary battery according to Embodiment 3 of the present invention in a state where the outermost peripheral end of an electrode group is not fixed.
【図７】実施の形態３に係る極板群の最外周外面に対応
する第１の極板の上面図（ａ）およびそのIV−IV線にお
ける断面図（ｂ）である。7A is a top view of the first electrode plate corresponding to the outermost peripheral surface of the electrode group according to the third embodiment, and FIG. 7B is a cross-sectional view taken along line IV-IV of FIG.
【図８】本発明の実施の形態４に係る非水電解質二次電
池が有する極板群の斜視図である。FIG. 8 is a perspective view of an electrode group included in a nonaqueous electrolyte secondary battery according to Embodiment 4 of the present invention.
１ 極板群 ２ 最外周を構成する極板 ３ 最外周を構成する極板の対極 ４ セパレータ ２ａ 最外周を構成する極板の末端部 ３ａ 最外周を構成する極板の対極の末端部 ４ａ セパレータの末端部 ６ 活物質を含む合剤層 ７ 最外周を構成する極板の末端部近傍外面に設けら
れた集電体露出部 ８ 最外周を構成する極板の末端部近傍内面に設けら
れた集電体露出部 ９ 集電体露出部８が対面する集電体露出部 １０ 集電体露出部に設けられた窓部 １１ 最外周を構成する極板用タブリード １２ 最外周を構成する極板の対極用タブリードDESCRIPTION OF SYMBOLS 1 Electrode group 2 Electrode which comprises the outermost periphery 3 Counter electrode of the polar plate which comprises the outermost periphery 4 Separator 2a Terminal part of the electrode plate which comprises the outermost periphery 3a Terminal part of the counter electrode which comprises the outermost periphery 4a Separator 6 Terminal layer of active material 7 Mixture layer containing active material 7 Current collector exposed portion provided on outer surface near terminal end of electrode plate constituting outermost periphery 8 Provided on inner surface near terminal end of electrode plate constituting outermost periphery Current collector exposed portion 9 Current collector exposed portion facing current collector exposed portion 10 Window provided in current collector exposed portion 11 Tab lead for electrode plate constituting outermost periphery 12 Electrode plate constituting outermost periphery Tab lead for counter electrode
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｍ 4/04 Ｈ０１Ｍ 4/04 Ａ (72)発明者 渡邊 庄一郎 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 ▲高▼木 優 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 5H011 AA03 AA09 CC02 CC06 CC10 5H022 AA09 AA18 BB12 BB17 BB19 CC03 CC21 EE03 EE04 5H029 AJ03 AJ05 AJ14 AK03 AL07 AM03 AM05 AM07 BJ02 BJ14 BJ24 CJ05 CJ07 DJ02 DJ07 EJ01 EJ12 HJ12 5H050 AA07 AA19 BA17 CA08 CB08 DA04 DA20 EA02 EA10 EA23 EA28 FA05 GA07 GA09 HA03──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H01M 4/04 H01M 4/04 A (72) Inventor Shoichiro Watanabe 1006 Kazuma, Kazuma, Kazuma, Osaka Matsushita Electric Industrial Co., Ltd. (72) Inventor ▲ Taka ▼ Yu Yu 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.F-term (reference) AJ05 AJ14 AK03 AL07 AM03 AM05 AM07 BJ02 BJ14 BJ24 CJ05 CJ07 DJ02 DJ07 EJ01 EJ12 HJ12 5H050 AA07 AA19 BA17 CA08 CB08 DA04 DA20 EA02 EA10 EA23 EA28 FA05 GA07 GA09 HA03
Claims (15)
集電体からなる第１の極板および第２の極板、ならびに
前記第１の極板と第２の極板との間に介在するセパレー
タからなり、前記第１の極板、セパレータおよび第２の
極板は、第１の極板が第２の極板の外側に配されるよう
に渦巻状に巻回されている極板群を有する非水電解質二
次電池であって、 前記極板群の最外周に位置する第１の極板の末端部は、
前記セパレータの末端部および前記第２の極板の末端部
上を越えて１回り内側の第１の極板上に位置し、 前記第１の極板の末端部近傍の内面およびそこと対面す
る第１の極板の外面には、第１の極板の集電体が露出し
ており、その露出部が互いに接合されている非水電解質
二次電池。1. A first electrode plate and a second electrode plate each comprising an electrode mixture and a current collector supporting the same, and interposed between the first electrode plate and the second electrode plate. A first electrode plate, a separator and a second electrode plate, wherein the first electrode plate, the separator and the second electrode plate are spirally wound such that the first electrode plate is arranged outside the second electrode plate; A non-aqueous electrolyte secondary battery having: The terminal portion of the first electrode plate located at the outermost periphery of the electrode plate group,
It is located on the first electrode plate, which is one turn inside beyond the terminal portion of the separator and the terminal portion of the second electrode plate, and faces the inner surface near the terminal portion of the first electrode plate and therewith. A nonaqueous electrolyte secondary battery in which a current collector of the first electrode plate is exposed on an outer surface of the first electrode plate, and the exposed portions are joined to each other.
の極板の末端部近傍の外面に露出している請求項１記載
の非水電解質二次電池。2. The current collector of a first electrode plate further comprises:
2. The non-aqueous electrolyte secondary battery according to claim 1, which is exposed on the outer surface near the end of said electrode plate.
極板の集電体が露出している請求項１記載の非水電解質
二次電池。3. The non-aqueous electrolyte secondary battery according to claim 1, wherein the current collector of the first electrode plate is exposed entirely on the outermost periphery of the electrode group.
除されている請求項１〜３のいずれかに記載の非水電解
質二次電池。4. The non-aqueous electrolyte secondary battery according to claim 1, wherein a part of the first electrode plate in the vicinity of the end is cut off.
除されて、窓部を有する枠状に形成されている請求項４
記載の非水電解質二次電池。5. The first electrode plate is partially cut off in the vicinity of a terminal end to form a frame having a window.
The non-aqueous electrolyte secondary battery according to the above.
の部位より狭くなっている請求項１〜３のいずれかに記
載の非水電解質二次電池。6. The non-aqueous electrolyte secondary battery according to claim 1, wherein a width of the first electrode plate in the vicinity of an end portion is smaller than other portions.
びそこと対面する第１の極板の外面の集電体の露出部
が、リードを挟んで互いに溶接により接合されている請
求項１記載の非水電解質二次電池。7. An inner surface near an end of the first electrode plate and an exposed portion of a current collector on an outer surface of the first electrode plate facing the inner surface are welded to each other with a lead interposed therebetween. Item 2. The non-aqueous electrolyte secondary battery according to Item 1.
くは鉄合金からなる電池ケース、または鉄もしくは鉄合
金からなり内面にニッケルメッキを有する電池ケースを
有し、前記極板群の最外周に位置する第１の極板の外面
の集電体露出部が前記電池ケースと電気的に接続されて
いる請求項２または３記載の非水電解質二次電池。8. The electrode plate group according to claim 1, wherein the first electrode plate is a negative electrode plate, and has a battery case made of iron or an iron alloy, or a battery case made of iron or an iron alloy and having a nickel plating on an inner surface thereof. 4. The non-aqueous electrolyte secondary battery according to claim 2, wherein a current collector exposed portion on an outer surface of the first electrode plate located at an outermost periphery is electrically connected to the battery case.
ニウムまたはアルミニウム合金からなる電池ケースを有
し、前記極板群の最外周に位置する第１の極板の外面の
集電体露出部が前記電池ケースと電気的に接続されてい
る請求項２または３記載の非水電解質二次電池。9. The first electrode plate is a positive electrode plate, has a battery case made of aluminum or an aluminum alloy, and has a current collector on an outer surface of the first electrode plate located at the outermost periphery of the electrode plate group. The non-aqueous electrolyte secondary battery according to claim 2, wherein an exposed portion is electrically connected to the battery case.
が導出された状態で、樹脂フィルムまたは少なくとも一
方の面に樹脂層を有する金属箔からなる外装体により密
封されている請求項１記載の非水電解質二次電池。10. The electrode plate group is sealed by a package made of a resin film or a metal foil having a resin layer on at least one surface in a state where terminals connected to the electrode group are led out. Non-aqueous electrolyte secondary battery.
ミニウム合金箔、鉄箔、鉄合金箔またはニッケルメッキ
を有する鉄箔である請求項１０記載の非水電解質二次電
池。11. The non-aqueous electrolyte secondary battery according to claim 10, wherein the metal foil is an aluminum foil, an aluminum alloy foil, an iron foil, an iron alloy foil, or an iron foil having nickel plating.
とにより第１の極板を得る工程であって、少なくとも一
方の末端部近傍の両面および前記末端部から一定距離を
置いた位置の片面に集電体の露出部が残るように前記帯
状集電体に電極合剤を塗布する工程、 別の帯状集電体に別の電極合剤を支持させることにより
第２の極板を得る工程、 前記第１の極板と第２の極板との間にセパレータを介在
させて、第１の極板が第２の極板の外側に配されるよう
に、かつ、最外周に前記一方の末端部近傍の集電体露出
部が位置し、その露出部がセパレータの末端部および第
２の極板の末端部上を越えて前記末端部から一定距離を
置いた位置の集電体露出部上に位置するように渦巻状に
巻回することにより、極板群を得る工程、および対面す
る集電体の露出部同士を互いに接合する工程を有する非
水電解質二次電池の製造法。12. A step of obtaining a first electrode plate by supporting an electrode mixture on a belt-like current collector, wherein the first electrode plate is provided on both surfaces near at least one end and at a position at a certain distance from the end. A step of applying an electrode mixture to the band-shaped current collector such that an exposed portion of the current collector remains on one surface; and obtaining a second electrode plate by supporting another electrode mixture to another band-shaped current collector. Step, with a separator interposed between the first electrode plate and the second electrode plate, so that the first electrode plate is disposed outside the second electrode plate, and the outermost A current collector exposed portion is located near one end portion, and the exposed portion exceeds the end portion of the separator and the end portion of the second electrode plate and is located at a predetermined distance from the end portion. A step of obtaining an electrode group by spirally winding so as to be positioned on the exposed portion, and Preparation of non-aqueous electrolyte secondary battery including a step of joining the output portions to each other.
ット溶接、超音波溶接またはレーザ溶接により行う請求
項１２記載の非水電解質二次電池の製造法。13. The method for manufacturing a nonaqueous electrolyte secondary battery according to claim 12, wherein the joining of the exposed portions of the current collector facing each other is performed by spot welding, ultrasonic welding, or laser welding.
成分またはシアノアクリレート基を有する成分を含有す
る接着剤により行う請求項１２記載の非水電解質二次電
池の製造法。14. The method for producing a non-aqueous electrolyte secondary battery according to claim 12, wherein the facing exposed portion of the current collector is joined by an adhesive containing a rubber component or a component having a cyanoacrylate group.
する工程が、前記露出部の少なくとも一方に接着剤を塗
布し、露出部同士を貼り合わせ、７０〜１００℃で加熱
しながら加圧する工程である請求項１２記載の非水電解
質二次電池の製造法。15. A step of bonding exposed portions of the current collector facing each other to each other by applying an adhesive to at least one of the exposed portions, bonding the exposed portions together, and applying pressure while heating at 70 to 100 ° C. The method for producing a nonaqueous electrolyte secondary battery according to claim 12, which is a step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001012339A JP4824177B2 (en) | 2001-01-19 | 2001-01-19 | Non-aqueous electrolyte secondary battery and manufacturing method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001012339A JP4824177B2 (en) | 2001-01-19 | 2001-01-19 | Non-aqueous electrolyte secondary battery and manufacturing method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002216853A true JP2002216853A (en) | 2002-08-02 |
| JP4824177B2 JP4824177B2 (en) | 2011-11-30 |
Family
ID=18879364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001012339A Expired - Fee Related JP4824177B2 (en) | 2001-01-19 | 2001-01-19 | Non-aqueous electrolyte secondary battery and manufacturing method thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4824177B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009117290A (en) * | 2007-11-09 | 2009-05-28 | Nec Tokin Corp | Sealed battery |
| JP2009289570A (en) * | 2008-05-29 | 2009-12-10 | Sony Corp | Rolled electrode, non-aqueous electrolyte secondary battery, and method of manufacturing rolled electrode |
| WO2011105285A1 (en) | 2010-02-23 | 2011-09-01 | Tdk株式会社 | Electrochemical device and method for manufacturing electrochemical device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10302753A (en) * | 1997-02-28 | 1998-11-13 | Japan Storage Battery Co Ltd | Connection structure of electric collector of pole plate of battery and lead |
| JPH11111327A (en) * | 1997-10-02 | 1999-04-23 | Fuji Elelctrochem Co Ltd | Battery having spiral electrode body |
| JPH11144765A (en) * | 1997-11-11 | 1999-05-28 | Toray Ind Inc | Nonaqueous electrolyte secondary battery |
| JPH11176478A (en) * | 1997-12-15 | 1999-07-02 | Hitachi Maxell Ltd | Organic electrolyte secondary battery |
| JPH11176420A (en) * | 1997-12-12 | 1999-07-02 | Fuji Elelctrochem Co Ltd | Nonaqueous electrolyte secondary battery |
| JP2002025627A (en) * | 2000-07-13 | 2002-01-25 | Yuasa Corp | Nonaqueous film package secondary battery |
-
2001
- 2001-01-19 JP JP2001012339A patent/JP4824177B2/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10302753A (en) * | 1997-02-28 | 1998-11-13 | Japan Storage Battery Co Ltd | Connection structure of electric collector of pole plate of battery and lead |
| JPH11111327A (en) * | 1997-10-02 | 1999-04-23 | Fuji Elelctrochem Co Ltd | Battery having spiral electrode body |
| JPH11144765A (en) * | 1997-11-11 | 1999-05-28 | Toray Ind Inc | Nonaqueous electrolyte secondary battery |
| JPH11176420A (en) * | 1997-12-12 | 1999-07-02 | Fuji Elelctrochem Co Ltd | Nonaqueous electrolyte secondary battery |
| JPH11176478A (en) * | 1997-12-15 | 1999-07-02 | Hitachi Maxell Ltd | Organic electrolyte secondary battery |
| JP2002025627A (en) * | 2000-07-13 | 2002-01-25 | Yuasa Corp | Nonaqueous film package secondary battery |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009117290A (en) * | 2007-11-09 | 2009-05-28 | Nec Tokin Corp | Sealed battery |
| JP2009289570A (en) * | 2008-05-29 | 2009-12-10 | Sony Corp | Rolled electrode, non-aqueous electrolyte secondary battery, and method of manufacturing rolled electrode |
| US8257849B2 (en) | 2008-05-29 | 2012-09-04 | Sony Corporation | Winding electrode body, nonaqueous electrolyte secondary battery, and method for manufacturing winding electrode body |
| WO2011105285A1 (en) | 2010-02-23 | 2011-09-01 | Tdk株式会社 | Electrochemical device and method for manufacturing electrochemical device |
| US9236632B2 (en) | 2010-02-23 | 2016-01-12 | Tdk Corporation | Electrochemical device and method for manufacturing electrochemical device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4824177B2 (en) | 2011-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110429320B (en) | Winding type battery | |
| JP4075034B2 (en) | Nonaqueous electrolyte battery and manufacturing method thereof | |
| JP3428448B2 (en) | Electrode structure and battery using the same | |
| JP2006278142A (en) | Square battery with spiral electrode | |
| JP2000188115A (en) | Thin type battery | |
| CN107851768B (en) | Method for manufacturing electrochemical device | |
| JP2005093242A (en) | Secondary battery | |
| WO2018168628A1 (en) | Non-aqueous electrolyte secondary battery | |
| JP3821434B2 (en) | Battery electrode group and non-aqueous electrolyte secondary battery using the same | |
| WO2017010042A1 (en) | Winding-type battery | |
| JP2001283927A (en) | Nonaqueous secondary battery and its manufacturing method | |
| JP2000348754A (en) | Rolled electrode type battery | |
| JP2000208129A (en) | Lithium secondary battery | |
| WO2013047515A1 (en) | Non-aqueous electrolyte secondary battery | |
| CN109891640B (en) | Electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery | |
| JP2000173657A (en) | Solid electrolyte battery | |
| JP4636920B2 (en) | Battery with spiral electrode | |
| JP4679104B2 (en) | Nonaqueous electrolyte secondary battery and manufacturing method thereof | |
| JP3588264B2 (en) | Rechargeable battery | |
| JP2011222128A (en) | Secondary battery | |
| JP2002175839A (en) | Sealed battery | |
| JP2001283915A (en) | Manufacturing method of battery | |
| JP4363558B2 (en) | Flat non-aqueous electrolyte secondary battery | |
| JP2002216853A (en) | Nonaqueous electrolyte secondary cell, and manufacturing method of the same | |
| JP7320166B2 (en) | secondary battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20071025 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20100707 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20100729 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20100831 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20110818 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20110908 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20140916 Year of fee payment: 3 |
|
| LAPS | Cancellation because of no payment of annual fees |