JPH11162522A - Nonaqueous electrolytic solution secondary battery - Google Patents
Nonaqueous electrolytic solution secondary batteryInfo
- Publication number
- JPH11162522A JPH11162522A JP9331985A JP33198597A JPH11162522A JP H11162522 A JPH11162522 A JP H11162522A JP 9331985 A JP9331985 A JP 9331985A JP 33198597 A JP33198597 A JP 33198597A JP H11162522 A JPH11162522 A JP H11162522A
- Authority
- JP
- Japan
- Prior art keywords
- electrode sheet
- sheet
- negative electrode
- positive electrode
- width
- 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.)
- Pending
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
- Secondary Cells (AREA)
- Cell Electrode Carriers And Collectors (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、捲回型の電極部を
有する非水電解液電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte battery having a wound electrode portion.
【０００２】[0002]
【従来の技術】近年、電子機器類の発達，発展に対応し
て、小形化・軽量で、かつエネルギー密度が高く、繰り
返し放充電できる非水電解液二次電池が注目されてい
る。この種の非水電解液二次電池としては、 (a)リチウ
ムやリチウム合金を負極活物質とする負極、モリブテ
ン、バナジウム、チタン、ニオブなどの酸化物，硫化物
もしくはセレン化物を正極活物質とする正極、および非
水電解液を発電要素（電池発電要素）として備えたリチ
ウム電池、あるいは (b)負極活物質としてカーボンを用
い、正極活物質としてリチウムコバルト酸化物、リチウ
ムニッケル酸化物、リチウムマンガン酸化物を使用した
リチウムイオン電池が知られている。2. Description of the Related Art In recent years, attention has been paid to non-aqueous electrolyte secondary batteries which are small in size and light in weight, have a high energy density, and can be repeatedly charged and discharged in response to the development and development of electronic devices. This type of nonaqueous electrolyte secondary battery includes: (a) a negative electrode using lithium or a lithium alloy as a negative electrode active material; Battery with a positive electrode and a non-aqueous electrolyte as a power generation element (battery power generation element); or (b) using carbon as a negative electrode active material and lithium cobalt oxide, lithium nickel oxide, lithium manganese as a positive electrode active material Lithium ion batteries using oxides are known.
【０００３】上記、リチウムイオン電池などの非水電解
液二次電池は、銀電池やアルカリ電池に比べて自己放電
が小さいため、長期間の使用に耐えることから、電卓，
時計などの電源に使用されている。また、携帯用電話機
や携帯型撮像機など各種の機器システムに組込み、作動
電源として使用する電池においても、携帯用電話機や携
帯型撮像機などの小形化や軽量化に伴って、電源として
高エネルギー密度の高いリチウムイオン電池などが要求
されている。The above non-aqueous electrolyte secondary batteries such as lithium ion batteries have a lower self-discharge than silver batteries and alkaline batteries, and thus can withstand long-term use.
Used for power supplies such as clocks. In addition, batteries that are incorporated into various device systems such as mobile phones and portable imaging devices and are used as an operating power source also require high energy as a power source due to the miniaturization and weight reduction of mobile phones and portable imaging devices. There is a demand for high-density lithium ion batteries and the like.
【０００４】なお、リチウムイオン電池では、リチウム
（Li），コバルト（Co）を主成分とするような複合金属
酸化物を正極活物質に、また、コークスや有機焼成体な
どの単素質材料を負極活物質にに用い、さらに、炭酸プ
ロピレン，炭酸エチレン，1,2-ジメトキシエタン，γ -
ブチロラクトン，テトラヒドロフランなどの有機溶剤中
に、 LiCl04 ，LiBF4 ， LiAsF6 などのリチウム塩を溶
解させて成る非水電解液が用いられている。In a lithium ion battery, a composite metal oxide containing lithium (Li) or cobalt (Co) as a main component is used as a positive electrode active material, and a simple material such as coke or an organic fired body is used as a negative electrode. Used for active materials, propylene carbonate, ethylene carbonate, 1,2-dimethoxyethane, γ-
Butyrolactone, in an organic solvent such as tetrahydrofuran, LiCl0 4, LiBF 4, comprising dissolving a lithium salt such as LiAsF 6 nonaqueous electrolyte is used.
【０００５】また、この種の非水電解液二次電池の出力
特性は、層間絶縁性シート（セパレータ）を介して対向
する正極シートおよび負極シートの対向面積に比例する
ので、大電流を取り出すために、正極シートおよび負極
シートをセパレータを介して、渦巻き状に捲装（巻回）
して対向面積を広く設定している。The output characteristics of this type of non-aqueous electrolyte secondary battery are proportional to the areas of the positive and negative electrodes facing each other with an interlayer insulating sheet (separator) interposed therebetween. Then, the positive electrode sheet and the negative electrode sheet are spirally wound (wound) via a separator.
The facing area is set wide.
【０００６】図３は、従来、捲回型電極部の製造に使用
されている製造装置の要部構成を平面的に示したもので
ある。ここで、１は帯状の正極シート２，負極シート３
および層間絶縁用シート４，４′を渦巻状に巻装する巻
芯体1aを有する捲回機構本体、５は前記捲回機構本体１
の巻芯体1aに正極シート２，第１の層間絶縁用シート
４，負極シート３および第２の層間絶縁用シート４′を
各別に供給する走行路5a，5b，5c，5dを備えたガイド機
構、6a，6bは前記捲回機構本体１の巻芯体1aに隣接した
位置で、第１の層間絶縁用シート４もしくは第２の層間
絶縁用シート４′を介して正極シート２，負極シート３
を、それぞれ加圧する加圧手段（たとえば加圧ローラ）
である。FIG. 3 is a plan view showing a main configuration of a manufacturing apparatus conventionally used for manufacturing a wound electrode portion. Here, 1 is a strip-shaped positive electrode sheet 2 and a negative electrode sheet 3
And a winding mechanism main body 5 having a winding core 1a for spirally winding the interlayer insulating sheets 4, 4 '.
A guide provided with running paths 5a, 5b, 5c and 5d for supplying a positive electrode sheet 2, a first interlayer insulating sheet 4, a negative electrode sheet 3 and a second interlayer insulating sheet 4 'to the core 1a of The mechanisms 6a and 6b are positioned adjacent to the core 1a of the winding mechanism main body 1 at the positive electrode sheet 2 and the negative electrode sheet via the first interlayer insulating sheet 4 or the second interlayer insulating sheet 4 '. 3
(Eg, a pressure roller)
It is.
【０００７】そして、この製造装置による捲回型電極の
製造は、次のように行われている。すなわち、巻芯体1a
の対向する平坦面間に層間絶縁用シート（セパレータ）
を挟持させ、かつこの層間絶縁用シート４に負極シート
３を、また層間絶縁用シート４′に正極シート２を、そ
れぞれ沿わせた形で供給する一方、加圧手段6a，6bによ
って、巻芯体1a外周面側に正極シート２および負極シー
ト３を加圧しながら、捲回機構本体１の巻芯体1aを矢印
方向に回転・駆動することで巻き込み、捲回型電極（起
電部）を製造している。[0007] The production of a wound electrode by this production apparatus is performed as follows. That is, the core 1a
For interlayer insulation (separator) between flat surfaces facing each other
And the negative electrode sheet 3 is supplied to the interlayer insulating sheet 4 and the positive electrode sheet 2 is supplied to the interlayer insulating sheet 4 'in a state of being arranged along the same. While pressing the positive electrode sheet 2 and the negative electrode sheet 3 on the outer peripheral surface side of the body 1a, the winding core 1a of the winding mechanism body 1 is rotated and driven in the direction of the arrow, thereby winding up the wound electrode (electromotive part). Manufacturing.
【０００８】[0008]
【発明が解決しようとする課題】ところで、上記携帯用
電話機や携帯型撮像機などのコードレス化に伴って、駆
動電源としての電池においては、高容量化など電池特性
が重視されるだけでなく、高度なコンパクト化、製造歩
留まり、信頼性なども併せて要求される。たとえば高容
量化を図る二次電池の場合、正極シート２、負極シート
３および層間絶縁用シート４，４′の巻層数増大、緻密
な巻装化などが要求される一方、巻装された正極シート
２および負極シート３間の絶縁なども十分確保されてい
る必要がある。 上記電極シート２，３およびセパレー
タ４，４′の巻層数増大、緻密な巻装化は、電池容量の
向上に寄与する一方、対向する電極シート同士２，３の
近接化となり端縁部において、短絡などを起こし易いと
いう問題がある。そして、この端縁部における短絡問題
に対しては、通常、介挿するセパレータ４，４′の幅を
電極シート２，３の幅よりも幅広に設定している。しか
し、さらなる電池の小形化の要求、この要求に対応した
電極部のコンパクト化において、上記セパレータ４，
４′の端縁部の形崩れや損傷、あるいは位置ズレなどに
起因する短絡が依然として懸念され、電池の製造歩留ま
りもしくは信頼性が損なわれる。However, with the recent trend toward cordless portable telephones and portable imaging devices, batteries as a drive power source not only emphasize battery characteristics such as high capacity, Advanced compactness, manufacturing yield, and reliability are also required. For example, in the case of a secondary battery that aims to increase the capacity, the number of wound layers of the positive electrode sheet 2, the negative electrode sheet 3, and the interlayer insulating sheets 4, 4 'is required to be increased, and dense winding is required. It is necessary that sufficient insulation between the positive electrode sheet 2 and the negative electrode sheet 3 is ensured. The increase in the number of winding layers and dense winding of the electrode sheets 2 and 3 and the separators 4 and 4 'contribute to the improvement of the battery capacity. However, there is a problem that a short circuit or the like is easily caused. In order to solve the problem of short circuit at the edge, the width of the interposed separators 4, 4 'is generally set to be wider than the width of the electrode sheets 2, 3. However, in the demand for further downsizing of the battery and the compactness of the electrode portion corresponding to this demand, the above-mentioned separator 4,
There is still a concern that the edge of the 4 'may be deformed or damaged, or a short circuit may occur due to misalignment, thereby impairing the production yield or reliability of the battery.
【０００９】本発明は、上記事情に対処してなされたも
ので、コンパクト化ないし高容量化が可能で、かつ信頼
性の高い非水電解液二次電池の提供を目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly reliable non-aqueous electrolyte secondary battery which can be reduced in size or capacity.
【００１０】[0010]
【課題を解決するための手段】請求項１の発明は、帯状
の正極シート、負極シートおよび層間絶縁用シートを渦
巻状に巻装して成る電極部と、前記電極部に担持された
非水電解液とを有する非水電解液二次電池において、前
記電極部を構成する正極シートの幅 A、負極シートの幅
Bおよび層間絶縁用シートの幅C は、層間絶縁用シート
A＞負極シート B＞正極シート Cの関係にあり、負極シ
ート B／正極シート C＝ 1／0.88〜 0.985で、かつ積層
部端面では負極シート Bの幅が少なくとも 1％突出して
いることを特徴とする非水電解液二次電池である。According to a first aspect of the present invention, there is provided an electrode portion formed by spirally winding a strip-shaped positive electrode sheet, a negative electrode sheet, and an interlayer insulating sheet, and a non-aqueous liquid carried on the electrode portion. In a non-aqueous electrolyte secondary battery having an electrolyte, the width A of the positive electrode sheet constituting the electrode portion and the width of the negative electrode sheet
B and width C of interlayer insulation sheet
A> Negative electrode sheet B> Positive electrode sheet C, characterized in that the negative electrode sheet B / positive electrode sheet C is 1 / 0.88 to 0.985, and that the width of the negative electrode sheet B protrudes at least 1% at the end face of the laminated portion. Non-aqueous electrolyte secondary battery.
【００１１】本発明において、正極シートは、たとえば
厚さ 5〜50μm の銅、ニッケル、アルミニウム、ステン
レス鋼などの金属箔（集電体）の少なくとも一方の面
に、正極活物質を塗着・圧接して形成されたものなど挙
げられる。ここで、正極活物質としては、リチウムを脱
ドープし、かつドープできる活物質、たとえばリチウム
やコバルトを含む複合酸化物（ LiCoO2 、 LiNiO2 、Li
Mn2 O 4 ）などが例示される。In the present invention, the positive electrode sheet is formed by applying and pressing a positive electrode active material to at least one surface of a metal foil (collector) such as copper, nickel, aluminum, and stainless steel having a thickness of 5 to 50 μm. And the like. Here, as the positive electrode active material, an active material capable of dedoping and doping lithium, for example, a complex oxide containing lithium or cobalt (LiCoO 2 , LiNiO 2 , LiLi
Mn 2 O 4 ).
【００１２】また、負極シートも同様に、たとえば厚さ
5〜50μm の銅、ニッケル、アルミニウム、ステンレス
鋼などの金属箔（集電体）の少なくとも一方の面に、負
極活物質を塗着・圧接して形成されたものなど挙げられ
る。ここで、負極活物質としては、たとえばグラファイ
ト、ニードルコークス、メソフェーズ小球体カーボン、
メソフェーズピッチ系カーボン繊維、有機高分子の焼成
体が例示される。Similarly, the negative electrode sheet has a thickness
A material formed by applying a negative electrode active material to at least one surface of a metal foil (current collector) of 5 to 50 μm, such as copper, nickel, aluminum, or stainless steel, and pressing the same, and the like. Here, as the negative electrode active material, for example, graphite, needle coke, mesophase small spherical carbon,
Examples thereof include mesophase pitch-based carbon fibers and fired bodies of organic polymers.
【００１３】さらに、負極シートおよび正極シート間を
絶縁離隔する層間絶縁用シートとしては、たとえばポリ
エチレン、ポリプロピレンなどのポリオレフィン系樹脂
の不織布や多孔膜などが挙げられる。Further, examples of the interlayer insulating sheet which insulates and separates the negative electrode sheet and the positive electrode sheet include a nonwoven fabric and a porous film of a polyolefin resin such as polyethylene and polypropylene.
【００１４】そして、本発明は、次のような知見に基づ
いて成されたものである。すなわち、電極部の構成にお
いて、正極シートの幅 A、負極シートの幅 Bおよび層間
絶縁用シートの幅 Cを、常に、 層間絶縁用シート A＞負極シート B＞正極シート C の関係にあるように選部とともに、 負極シート B／正極シート C＝ 1／0.88〜 0.985 で、かつ互いに対向した積層部端面では負極シート Bの
幅が少なくとも 1％の割合で突出しているように選択・
設定した場合、負極シートおよび正極シートの端縁での
短絡発生が全面域に回避され、製造歩留まりおよび電池
の信頼性向上が図られることを見出し、本願発明に至っ
たものである。The present invention has been made based on the following findings. That is, in the configuration of the electrode portion, the width A of the positive electrode sheet, the width B of the negative electrode sheet, and the width C of the interlayer insulating sheet are always set so that the relation of the interlayer insulating sheet A> the negative electrode sheet B> the positive electrode sheet C is satisfied. Along with the selection, the negative electrode sheet B / positive electrode sheet C is selected to be 1 / 0.88 to 0.985, and the width of the negative electrode sheet B protrudes at least 1% on the end faces of the laminated sections facing each other.
When the setting is made, it has been found that the occurrence of a short circuit at the edges of the negative electrode sheet and the positive electrode sheet is avoided over the entire area, and that the production yield and the reliability of the battery are improved, leading to the present invention.
【００１５】なお、負極シート／正極シート＝ 1／0.88
未満の場合は、電池容量の低下となり、また、負極シー
ト／正極シート＝ 1／ 0.985を超えると、端縁での短絡
が発生し易く、過充電時などにおける安全性が低下す
る。ここで、負極シート幅 B／正極シート幅 Cの比は、
角型の場合 1／0.88〜0.975 に、また円筒型の場合 1／
0.90〜0.985 に選択設定することが好ましい。Incidentally, the negative electrode sheet / positive electrode sheet = 1 / 0.88
If it is less than 1, the battery capacity will be reduced. If it exceeds 1 / 0.985, the short circuit at the edge is likely to occur, and the safety at the time of overcharging etc. will be reduced. Here, the ratio of the negative electrode sheet width B / the positive electrode sheet width C is
1 / 0.88 to 0.975 for square type and 1 / 0.8 for cylindrical type
It is preferable to select and set 0.90 to 0.985.
【００１６】本発明に係る非水電解液二次電池は、次の
ように構成されている。すなわち一方の端子（正極端子
もしくは負極端子）となる外装缶内、たとえばステンレ
ス鋼製、鉄製もしくはアルミニウム製の有底筒体内に、
上記正極シート、負極シートおよび層間絶縁用シートの
捲装体化で形成された電極部を装着・配置する。その
後、所要の非水電解液を注入する一方、外装缶の開口部
を他方の端子として機能する封口蓋体（たとえばステン
レス鋼製、鉄製もしくはアルミニウム製）で絶縁・封口
することにより構成されている。なお、外装缶は、電極
部の最外周に位置する電極シート側の端子となり、他の
電極シート側は封口蓋体にリード線（たとえばアルミニ
ウム、ニッケル、銅、鉄などの金属製）を介して接続す
る。The non-aqueous electrolyte secondary battery according to the present invention is configured as follows. That is, inside the outer can that will be one terminal (positive electrode terminal or negative electrode terminal), for example, a stainless steel, iron or aluminum bottomed cylinder,
The electrode portions formed by winding the positive electrode sheet, the negative electrode sheet, and the interlayer insulating sheet are mounted and arranged. Thereafter, the required non-aqueous electrolyte is injected, and the opening of the outer can is insulated and sealed with a sealing lid (for example, stainless steel, iron or aluminum) which functions as the other terminal. . Note that the outer can is a terminal on the electrode sheet side located at the outermost periphery of the electrode portion, and the other electrode sheet side is connected to the sealing lid via a lead wire (for example, a metal such as aluminum, nickel, copper, or iron). Connecting.
【００１７】上記非水電解液としては、たとえばエチレ
ンカーボネート、プロピレンカーボネート、ブチレンカ
ーボネート、γ- ブチロラクトン、スルホラン、アセト
ニトリル、1,2-ジメトキシメタン、1,3-ジメトキシプロ
パン、ジメチルエーテル、テトラヒドロフラン、2-メチ
ルテトラヒドロフラン、炭酸ジメチル、炭酸ジエチルお
よびエチルメチルカーボネートの群れから選ばれた少な
くとも１種から成る有機溶剤（非水溶媒）に、過塩素酸
リチウム（ LiClO4 ）、六フッ化リン酸リチウム（LiPF
6 ）、ホウフッ化リチウム（LiBF4 ）、六フッ化ヒ素リ
チウム（ LiAsF6 ）、トリフルオロメタンスルホン酸リ
チウム（LiCF3 SO3 ）などのリチウム塩（電解質）を
0.5〜 1.5 mol／l 程度溶解させた非水電解液が一般的
に挙げられる。Examples of the non-aqueous electrolyte include ethylene carbonate, propylene carbonate, butylene carbonate, γ-butyrolactone, sulfolane, acetonitrile, 1,2-dimethoxymethane, 1,3-dimethoxypropane, dimethyl ether, tetrahydrofuran and 2-methyl An organic solvent (non-aqueous solvent) comprising at least one selected from the group consisting of tetrahydrofuran, dimethyl carbonate, diethyl carbonate and ethyl methyl carbonate is added to lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF
6), lithium borofluoride (LiBF 4), lithium hexafluoroarsenate (LiAsF 6), lithium trifluoromethanesulfonate and (LiCF 3 SO 3) lithium salts such as (electrolyte)
A non-aqueous electrolyte in which about 0.5 to 1.5 mol / l is dissolved is generally mentioned.
【００１８】請求項１の発明では、電極部を構成する正
極シートの幅、負極シートの幅および層間絶縁用シート
の幅が一定の関係に選択・設定され、かつ負極シート幅
よりも正極シート幅を一定の割合で狭く選択・設定する
とともに、互いに対向する領域では正極シートの端縁
が、常時、負極シートの端縁よりも内側に位置するよう
に設定されている。つまり、隣接・対向する正極シート
および負極シートの端縁が、常時、位置ズレしているた
め、負極シート端縁が隣接する正極シート端縁に接触す
る恐れは大幅に解消される。したがって、電極部が緻密
な捲装されている場合、あるいは電極部がコンパクトに
構成された場合でも、信頼性の高い電池として機能す
る。According to the first aspect of the present invention, the width of the positive electrode sheet, the width of the negative electrode sheet, and the width of the interlayer insulating sheet constituting the electrode portion are selected and set in a fixed relationship, and the width of the positive electrode sheet is larger than the width of the negative electrode sheet. Are selected and set narrowly at a fixed rate, and in the regions facing each other, the edge of the positive electrode sheet is always set to be located inside the edge of the negative electrode sheet. That is, since the edges of the adjacent and opposed positive electrode sheet and negative electrode sheet are always misaligned, the possibility that the negative electrode sheet edge contacts the adjacent positive electrode sheet edge is largely eliminated. Therefore, even when the electrode portion is densely wound or when the electrode portion is compactly formed, the battery functions as a highly reliable battery.
【００１９】[0019]
【発明の実施の形態】以下図１および図２を参照して実
施例を説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below with reference to FIGS.
【００２０】図１は、第１の実施例に係る非水電解液二
次電池の要部構成を示す断面図である。図１において、
７は一方の端子を兼ねる有底外装缶、８は前記有底外装
缶７内に装着配置された電極部、９は前記電極部８を装
着配置した有底外装缶７の開口部を、溶接などにより気
密に封口する一方、他方の端子10を絶縁・気密に導出さ
せた封口蓋体である。そして、この構造例では、電極部
８の最外周面が捲装された負極シート8aで形成されてお
り、この負極シート8aが有底外装缶７の内壁面に電気的
に接続されている。FIG. 1 is a sectional view showing the structure of a main part of a nonaqueous electrolyte secondary battery according to a first embodiment. In FIG.
Reference numeral 7 denotes a bottomed outer can also serving as one terminal, 8 denotes an electrode portion mounted and arranged in the bottomed outer can 7, 9 denotes an opening of the bottomed outer can 7 to which the electrode portion 8 is mounted and welded. This is a sealing lid that is hermetically sealed by, for example, while the other terminal 10 is insulated and airtightly led out. In this structural example, the outermost peripheral surface of the electrode portion 8 is formed of a wound negative electrode sheet 8a, and this negative electrode sheet 8a is electrically connected to the inner wall surface of the bottomed outer can 7.
【００２１】一方、有底外装缶７内に装着配置された電
極部８の正極シート8bは、封口蓋体９を絶縁・導出され
た他方の端子10に、リード線11を介して電気的に接続し
ている。また、前記電極部８には、たとえば六フッ化リ
ン酸リチウム（LiPF6 ）を電解質とし、これをプロピレ
ンカーボネートおよびジメトキシエタンの混合溶媒（体
積比 1： 1）に溶解して調製した非水機電解液が含浸・
充填されている。なお、図１において、12は有底外装缶
７内での、電極部８の移動を防止する電極押さえ板であ
る。On the other hand, the positive electrode sheet 8b of the electrode portion 8 mounted and arranged in the bottomed outer can 7 electrically connects the sealing lid 9 to the other terminal 10 which is insulated and led out via the lead wire 11. Connected. The electrode section 8 is made of a non-aqueous machine prepared by dissolving a lithium hexafluorophosphate (LiPF 6 ) electrolyte in a mixed solvent of propylene carbonate and dimethoxyethane (volume ratio 1: 1). Impregnated with electrolyte
Is filled. In FIG. 1, reference numeral 12 denotes an electrode pressing plate for preventing the movement of the electrode portion 8 in the bottomed outer can 7.
【００２２】上記構成において、電極部８は、たとえば
LiCoO2 、 LiNiO2 、LiMn2 O 4 などを、厚さ〜30μm
の銅箔の少なくとも片面に塗布して成る正極シート8b
と、たとえばメソフェーズピッチ系カーボン繊維などを
厚さ〜30μm の銅箔の少なくとも片面に塗布して成る負
極シート8aと、たとえばポリプロピレン樹脂製多孔質膜
から成るセパレータ8cとを捲装体化したものである。こ
こで、正極シート8bの幅Aは 36.25mm、負極シートの幅
Bは 40.25mm、セパレータの幅 Cは43mmであり、これら
を積層した場合、図２に平面的に示すようになり、かつ
正極シート8b幅端縁は、負極シート幅端縁よりも内側に
位置するように設定されている。In the above configuration, the electrode section 8 is, for example,
LiCoO 2 , LiNiO 2 , LiMn 2 O 4 etc., thickness ~ 30μm
Positive electrode sheet 8b coated on at least one side of copper foil
And a negative electrode sheet 8a formed by applying, for example, a mesophase pitch-based carbon fiber to at least one surface of a copper foil having a thickness of 30 μm, and a separator 8c formed of, for example, a porous film made of a polypropylene resin. is there. Here, the width A of the positive electrode sheet 8b is 36.25 mm, and the width of the negative electrode sheet is
B is 40.25 mm and the width C of the separator is 43 mm. When these are laminated, they are shown in a plan view in FIG. 2, and the width edge of the positive electrode sheet 8b is located inside the width edge of the negative electrode sheet. Is set to
【００２３】第２の実施例として、上記第１の非水電解
液二次電池の構成において、正極シート8bの幅 Aを 39.
25mmとした他は同一条件として、非水電解液二次電池を
構成した。As a second embodiment, in the configuration of the first nonaqueous electrolyte secondary battery, the width A of the positive electrode sheet 8b is set to 39.
A non-aqueous electrolyte secondary battery was configured under the same conditions except that the length was 25 mm.
【００２４】また、比較例として、上記第１の非水電解
液二次電池の構成において、正極シート8bの幅 Aを 35.
00mmとした他は同一条件で、非水電解液二次電池を構成
した。 上記３種の非水電解液二次電池について、それ
ぞれ電池容量を測定評価するとともに、充放電試験を行
って、過充電時の短絡発生有無など調査した。その結
果、実施例１および実施例２の非水電解液二次電池で
は、電池容量が 580 mAh程度と高く、かつ短絡などの異
常発生が認められなかった。一方、比較例の非水電解液
二次電池は、短絡などの異常発生が認められなかった
が、電池容量は 540 mAh程度と低かった。As a comparative example, in the configuration of the first nonaqueous electrolyte secondary battery, the width A of the positive electrode sheet 8b is set to 35.
A non-aqueous electrolyte secondary battery was formed under the same conditions except that the length was set to 00 mm. The three types of non-aqueous electrolyte secondary batteries were each measured and evaluated for battery capacity, and were subjected to a charge / discharge test to investigate whether a short circuit occurred during overcharge. As a result, in the non-aqueous electrolyte secondary batteries of Example 1 and Example 2, the battery capacity was as high as about 580 mAh, and no abnormalities such as short circuit were observed. On the other hand, in the nonaqueous electrolyte secondary battery of the comparative example, no abnormality such as a short circuit was observed, but the battery capacity was as low as about 540 mAh.
【００２５】なお、本発明は、上記実施例に限定される
ものでなく、発明の趣旨を逸脱しない範囲でいろいろの
変形を採り得る。たとえば、絶縁シート，正極シート，
負極シートの幅などは対象とする二次電池の種類，容量
にと対応して適宜設定できる。It should be noted that the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention. For example, insulation sheet, positive electrode sheet,
The width of the negative electrode sheet and the like can be appropriately set according to the type and capacity of the target secondary battery.
【００２６】[0026]
【発明の効果】請求項１の発明によれば、捲装され電極
部を形成する正極シートおよび負極シートの幅方向端縁
が相互に離隔され、接触し難い状態を保持しているた
め、過充電時におけるリチウムの析出、短絡発生などが
容易、かつ確実に防止される。また、落下・衝撃などで
電極部端縁面が圧接された場合でも、隣接する両電極シ
ート間の離隔が保持され易いため、両電極シート間の短
絡も回避でき、信頼性の高い非水電解液二次電池が提供
される。According to the first aspect of the present invention, since the widthwise edges of the wound positive electrode sheet and the negative electrode sheet forming the electrode portion are separated from each other and are kept in a state in which they are hardly in contact with each other. Precipitation of lithium, occurrence of a short circuit, and the like during charging are easily and reliably prevented. In addition, even if the edge of the electrode portion is pressed due to a drop or impact, the gap between the adjacent electrode sheets is easily maintained, so that a short circuit between the electrode sheets can be avoided, and highly reliable nonaqueous electrolysis. A liquid secondary battery is provided.
【図１】本発明に係る非水電解液二次電池の要部構造例
を示す断面図。FIG. 1 is a cross-sectional view showing an example of a main structure of a nonaqueous electrolyte secondary battery according to the present invention.
【図２】本発明に係る非水電解液二次電池が具備する電
極部の構成を展開して示す平面図。FIG. 2 is an exploded plan view showing a configuration of an electrode unit included in the nonaqueous electrolyte secondary battery according to the present invention.
【図３】非水電解液二次電池の電極部の製造例を説明す
るための模式図。FIG. 3 is a schematic diagram for explaining an example of manufacturing an electrode part of a nonaqueous electrolyte secondary battery.
７……一方の端子を兼ねる有底外装缶 ８……電極部 8a……負極シート 8b……正極シート 8c……層間絶縁用シート（セパレータ） ９……封口蓋体 10……他方の端子 11……リード線 12……電極押さえ板 7 ... bottomed outer can that also serves as one terminal 8 ... electrode section 8a ... negative electrode sheet 8b ... positive electrode sheet 8c ... interlayer insulating sheet (separator) 9 ... sealing lid 10 ... other terminal 11 …… Lead wire 12 …… Electrode holding plate
Claims (1)
間絶縁用シートを渦巻状に巻装して成る電極部と、 前記電極部に担持された非水電解液とを有する非水電解
液二次電池において、 前記電極部を構成する正極シートの幅 A、負極シートの
幅 Bおよび層間絶縁用シートの幅C は、 層間絶縁用シート A＞負極シート B＞正極シート Cの関
係にあり、負極シート B／正極シート C＝ 1／0.88〜
0.985で、かつ積層部端面では負極シート Bの幅が少な
くとも 1％突出していることを特徴とする非水電解液二
次電池。1. A non-aqueous electrolyte secondary having an electrode portion formed by spirally winding a strip-shaped positive electrode sheet, a negative electrode sheet, and an interlayer insulating sheet, and a non-aqueous electrolyte carried on the electrode portion. In the battery, the width A of the positive electrode sheet, the width B of the negative electrode sheet, and the width C of the interlayer insulating sheet constituting the electrode portion are in the relationship of interlayer insulating sheet A> negative sheet B> positive sheet C; B / Positive electrode sheet C = 1 / 0.88 ~
Nonaqueous electrolyte secondary battery characterized in that the width of the negative electrode sheet B protrudes at least 1% at 0.985 and at the end face of the laminated portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9331985A JPH11162522A (en) | 1997-12-02 | 1997-12-02 | Nonaqueous electrolytic solution secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9331985A JPH11162522A (en) | 1997-12-02 | 1997-12-02 | Nonaqueous electrolytic solution secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11162522A true JPH11162522A (en) | 1999-06-18 |
Family
ID=18249861
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9331985A Pending JPH11162522A (en) | 1997-12-02 | 1997-12-02 | Nonaqueous electrolytic solution secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11162522A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002100409A (en) * | 2000-09-22 | 2002-04-05 | Yuasa Corp | Nonaqueous secondary battery |
| JP2004342478A (en) * | 2003-05-16 | 2004-12-02 | Toshiba Battery Co Ltd | Flat type non-aqueous electrolyte secondary battery |
| JP2008066020A (en) * | 2006-09-05 | 2008-03-21 | Sony Corp | Nonaqueous electrolyte secondary battery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01128371A (en) * | 1987-11-11 | 1989-05-22 | Sony Corp | Nonaqueous electrolyte secondary cell |
| JPH0562713A (en) * | 1991-09-03 | 1993-03-12 | Asahi Chem Ind Co Ltd | Nonaqueous secondary battery |
| JPH07263028A (en) * | 1994-03-25 | 1995-10-13 | Fuji Photo Film Co Ltd | Nonaqueous secondary battery |
| JPH08298135A (en) * | 1995-04-27 | 1996-11-12 | Fuji Photo Film Co Ltd | Nonaqueous secondary battery |
-
1997
- 1997-12-02 JP JP9331985A patent/JPH11162522A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01128371A (en) * | 1987-11-11 | 1989-05-22 | Sony Corp | Nonaqueous electrolyte secondary cell |
| JPH0562713A (en) * | 1991-09-03 | 1993-03-12 | Asahi Chem Ind Co Ltd | Nonaqueous secondary battery |
| JPH07263028A (en) * | 1994-03-25 | 1995-10-13 | Fuji Photo Film Co Ltd | Nonaqueous secondary battery |
| JPH08298135A (en) * | 1995-04-27 | 1996-11-12 | Fuji Photo Film Co Ltd | Nonaqueous secondary battery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002100409A (en) * | 2000-09-22 | 2002-04-05 | Yuasa Corp | Nonaqueous secondary battery |
| JP2004342478A (en) * | 2003-05-16 | 2004-12-02 | Toshiba Battery Co Ltd | Flat type non-aqueous electrolyte secondary battery |
| JP2008066020A (en) * | 2006-09-05 | 2008-03-21 | Sony Corp | Nonaqueous electrolyte secondary battery |
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