JP3348524B2 - Non-aqueous electrolyte secondary battery and method of manufacturing the same - Google Patents
Non-aqueous electrolyte secondary battery and method of manufacturing the sameInfo
- Publication number
- JP3348524B2 JP3348524B2 JP14567994A JP14567994A JP3348524B2 JP 3348524 B2 JP3348524 B2 JP 3348524B2 JP 14567994 A JP14567994 A JP 14567994A JP 14567994 A JP14567994 A JP 14567994A JP 3348524 B2 JP3348524 B2 JP 3348524B2
- Authority
- JP
- Japan
- Prior art keywords
- separator
- center pin
- electrolyte secondary
- secondary battery
- aqueous electrolyte
- 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.)
- Expired - Fee Related
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)
Description
【０００１】[0001]
【産業上の利用分野】本発明は非水電解質二次電池に関
し、特に渦巻型電極体の製造方法に特徴を有する生産性
およびサイクル寿命が向上した非水電解質二次電池に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte secondary battery, and more particularly to a non-aqueous electrolyte secondary battery having improved productivity and cycle life, which is characterized by a method for manufacturing a spiral electrode body.
【０００２】[0002]
【従来の技術】近年、電子技術の進歩により、電子機器
の高性能化、小型化、ポータブル化が進み、これら電子
機器に使用される二次電池として高エネルギー密度のも
のに対する要求が強まっている。従来、これらの電子機
器に使用される二次電池としては、ニッケル・カドミウ
ム電池や鉛電池などが挙げられるが、ニッケル・カドミ
ウム電池や鉛電池は放電電位が低く、エネルギー密度の
高い電池を得るという目的は十分に達成されていない。
最近、リチウムやリチウム合金もしくは炭素材料のよう
なリチウムイオンをドープおよび脱ドープ可能な物質を
負極として用い、また正極にリチウムコバルト複合酸化
物などのリチウム複合酸化物を使用する非水電解質二次
電池の研究・開発が行われている。この電池は、電池電
圧が高く、高エネルギー密度を有し、自己放電も少な
く、かつ、サイクル特性に優れている。また、この電池
は渦巻型電極構造とすることで電極面積を大きくし、重
負荷放電を可能としている。2. Description of the Related Art In recent years, with the advance of electronic technology, electronic devices have been improved in performance, downsized, and portable, and demands for secondary batteries having a high energy density for use in these electronic devices have been increasing. . Conventionally, secondary batteries used in these electronic devices include nickel-cadmium batteries and lead batteries, but nickel-cadmium batteries and lead batteries have a low discharge potential and a battery with a high energy density. The purpose has not been sufficiently achieved.
Recently, non-aqueous electrolyte secondary batteries that use a material that can be doped and dedoped with lithium ions, such as lithium, lithium alloys, or carbon materials, as a negative electrode, and a lithium composite oxide, such as a lithium cobalt composite oxide, for the positive electrode Research and development. This battery has a high battery voltage, a high energy density, low self-discharge, and excellent cycle characteristics. Further, this battery has a spiral electrode structure to increase the electrode area and enable heavy-load discharge.
【０００３】[0003]
【発明が解決しようとする課題】一般に、渦巻型電極構
造を有する素子を製造する場合、割りピンでセパレータ
を初めに巻き取った後、帯状の正極と負極をセパレータ
を介して巻き取るが、割りピンを抜き取った跡に割りピ
ンの形状がそのまま残るため、割りピンを抜き取った跡
にセンターピンを挿入し易くするために、図３に示すよ
うに巻芯２１の空隙部２２に先端の鋭利なピン２３を差
し込み、巻芯２１に残るセパレータ３を変形して、その
後にセンターピンを挿入する工程が必要だった。なお、
センターピンは破壊的な外部加圧に対して電池強度を強
くするのに有効である。また、センターピンを容易に渦
巻型電極構造体の巻芯２１の空隙部２２に挿入するため
に空隙部２２の内径とセンターピンの外径にはクリアラ
ンスが設けられているが、このクリアランスがあるため
に、充放電のサイクルを繰り返すうちに渦巻型電極構造
に巻きゆるみが生じ、サイクル劣化の一要因となってい
た。本発明は渦巻型電極体を有する非水電解質二次電池
の生産性およびサイクル寿命を向上させた非水電解質二
次電池を提供することを目的としている。また、本発明
の目的は渦巻型電極構造に巻きゆるみが生じない非水電
解質二次電池を提供することを目的としている。Generally, when manufacturing an element having a spiral electrode structure, a separator is first wound up with a split pin, and then a strip-shaped positive electrode and a negative electrode are wound up through the separator. Since the shape of the split pin is left as it is on the trace where the pin was pulled out, a sharp tip of the tip is inserted into the gap 22 of the core 21 as shown in FIG. A step of inserting the pin 23, deforming the separator 3 remaining on the core 21, and thereafter inserting the center pin was required. In addition,
The center pin is effective to increase the battery strength against destructive external pressure. A clearance is provided between the inner diameter of the gap 22 and the outer diameter of the center pin in order to easily insert the center pin into the gap 22 of the core 21 of the spiral electrode structure. For this reason, while the charge / discharge cycle is repeated, the spiral electrode structure loosens, which is a factor of cycle deterioration. An object of the present invention is to provide a non-aqueous electrolyte secondary battery having a spiral-type electrode body and having improved productivity and cycle life of the non-aqueous electrolyte secondary battery. Another object of the present invention is to provide a non-aqueous electrolyte secondary battery in which the spiral electrode structure does not loosen.
【０００４】[0004]
【課題を解決するための手段】本発明の上記目的は次の
構成によって達成される。すなわち、帯状の正極と負極
と該正極と負極との間にセパレータを介して巻き取った
形状の渦巻型電極体を有する非水電解質二次電池におい
て、中空筒の長手方向にスリット状の割りが入ったセン
ターピンと、該センターピン内に一端が支持され、該セ
ンターピンのスリット状の割りを通してセンターピン表
面に巻き付けられた帯状のセパレータと、該セパレータ
を挟んでセンターピン表面に巻き付けられた帯状の正極
と負極とからなる渦巻型電極体を備えた非水電解質二次
電池である。本発明の上記非水電解質二次電池の中空筒
状のセンターピンの材質はステンレス、ニッケル、チタ
ン、スチール等の金属材料を用いることができる。ま
た、中空筒状センターピンの長手方向の長さは、帯状の
セパレータの幅方向の長さより短くすることで、センタ
ーピンをそのまま渦巻型電極体の芯体として用いること
ができる。The above object of the present invention is achieved by the following constitution. That is, in a non-aqueous electrolyte secondary battery having a spiral electrode body in the shape of a strip-shaped positive electrode and a negative electrode and a coil wound between the positive electrode and the negative electrode with a separator interposed therebetween, a slit-shaped split is formed in the longitudinal direction of the hollow cylinder. A center pin that has entered, one end supported in the center pin, a band-shaped separator wound around the center pin surface through a slit-shaped split of the center pin, and a band-shaped separator wound around the center pin surface with the separator interposed therebetween. This is a non-aqueous electrolyte secondary battery including a spiral electrode body including a positive electrode and a negative electrode. As the material of the hollow cylindrical center pin of the nonaqueous electrolyte secondary battery of the present invention, a metal material such as stainless steel, nickel, titanium, and steel can be used. Further, by making the length in the longitudinal direction of the hollow cylindrical center pin shorter than the length in the width direction of the band-shaped separator, the center pin can be used as it is as the core of the spiral electrode body.
【０００５】また、本発明の上記目的は次の構成によっ
て達成される。すなわち、帯状の正極と負極をセパレー
タを介して巻き取って得られる渦巻型電極体を有する非
水電解質二次電池において、セパレータ端部を円柱形の
長手方向に設けられた径方向の貫通孔を設けられた割り
ピンの前記貫通孔に挿入し、該割りピンで巻き取り、次
いで、中空筒の長手方向にスリット状の割りが入ったセ
ンターピン内に前記セパレータを巻き付けた割りピンに
挿入して、次いでセンターピン表面に帯状の正極と負極
をセパレータを介して巻き取り、渦巻型電極体を作製す
る非水電解質二次電池の製造方法である。[0005] The above object of the present invention is achieved by the following constitution. That is, in a non-aqueous electrolyte secondary battery having a spiral electrode body obtained by winding a strip-shaped positive electrode and a negative electrode through a separator, a radial through hole provided with a separator end portion in a cylindrical longitudinal direction. Inserted into the through hole of the provided split pin, wound with the split pin, and then inserted into the split pin with the separator wound in a center pin with a slit-shaped split in the longitudinal direction of the hollow cylinder. Then, a belt-shaped positive electrode and a negative electrode are wound around a center pin surface via a separator to produce a spirally wound electrode body.
【０００６】[0006]
【作用】本発明において、帯状のセパレータの一端部を
割りピンでまず巻き取り、次に中空筒の長手方向の一ケ
所にスリット状の割りが入ったセンターピン内に前記セ
パレータの一端を支持した割りピンを挿入した後に帯状
の正極、負極をセパレータを介して巻き取ることにより
渦巻型電極体を作製する。得られた渦巻型電極体には、
すでにセンターピンが挿入されているので電極体を円筒
形状に維持することができる。こうして、従来技術で必
要な渦巻型電極体の中心部にセンターピンを挿入するた
めに割りピンの抜き出した跡に形成される巻芯空隙部に
センターピンを挿入するために、該空隙部の先端を鋭利
なピンで成形する工程と成形した後にセンターピンを挿
入する工程が本発明では不必要になるので、生産性が向
上する。また、本発明で得られる渦巻型電極体では巻芯
空隙部の内径とセンターピンの外形にクリアランスがな
いため、巻きゆるみによるサイクル劣化が抑制される。In the present invention, one end of the strip-shaped separator is first wound up with a split pin, and then one end of the separator is supported in a center pin having a slit-shaped split at one location in the longitudinal direction of the hollow cylinder. After inserting the cotter pin, the belt-like positive electrode and negative electrode are wound up through a separator to produce a spiral electrode body. In the obtained spiral electrode body,
Since the center pin is already inserted, the electrode body can be maintained in a cylindrical shape. Thus, in order to insert the center pin into the core gap formed in the trace of the split pin to be inserted in the center of the spiral electrode body required in the prior art, the tip of the gap is inserted. In the present invention, a step of forming a center pin with a sharp pin and a step of inserting a center pin after the forming are not required in the present invention, so that productivity is improved. Further, in the spiral electrode body obtained in the present invention, since there is no clearance between the inner diameter of the core gap and the outer shape of the center pin, cycle deterioration due to loose winding is suppressed.
【０００７】[0007]
【実施例】本発明の一実施例を図面と共に説明する。 実施例 正極活物質の主成分であるコバルト酸リチウム（ＬｉＣ
ｏＯ2）の合成を次のように行った。炭酸リチウムと炭
酸コバルトをＬｉ／Ｃｏ（モル比）＝１になるように混
合し、空気中で９００℃、５時間焼成した。この材料に
ついてＸ線回折測定を行った結果、ＪＣＰＤＳカードの
ＬｉＣｏＯ2と良く一致していた。このようにして得ら
れたＬｉＣｏＯ2を用い、ＬｉＣｏＯ2９５重量％と炭酸
リチウム５重量％からなる混合品を正極活物質とした。
また、導電材であるグラファイトＫＳ−１５を６重量％
と結着剤であるポリフッ化ビニリデンを３重量％および
前記正極活物質９１重量％からなる混合物から正極合剤
を作成し、これをＮ−メチル−２−ピロリドン中に分散
してスラリー状とした。次にこのスラリーを正極集電体
である帯状のアルミニウム箔の両面に塗布し、乾燥後ロ
ーラープレス機で圧縮成形して正極を作成した。An embodiment of the present invention will be described with reference to the drawings. Example Lithium cobaltate (LiC) which is a main component of a positive electrode active material was used.
oO 2 ) was synthesized as follows. Lithium carbonate and cobalt carbonate were mixed such that Li / Co (molar ratio) = 1 and fired in air at 900 ° C. for 5 hours. As a result of X-ray diffraction measurement of this material, it was in good agreement with LiCoO 2 of the JCPDS card. Using the thus obtained LiCoO 2 , a mixture comprising 95% by weight of LiCoO 2 and 5% by weight of lithium carbonate was used as a positive electrode active material.
Further, 6% by weight of graphite KS-15 which is a conductive material is used.
And 3% by weight of polyvinylidene fluoride as a binder and 91% by weight of the positive electrode active material to prepare a positive electrode mixture, and this was dispersed in N-methyl-2-pyrrolidone to form a slurry. . Next, this slurry was applied to both sides of a belt-shaped aluminum foil as a positive electrode current collector, dried, and then compression-molded with a roller press to form a positive electrode.
【０００８】次に負極活物質はつぎのようにして作製し
た。出発物質として石油ピッチを用い、これを酸素を含
む官能基を１０〜２０％導入（いわゆる酸素架橋）した
後、不活性ガス中１０００℃で焼成して得たガラス状炭
素に近い性質の難黒鉛化炭素材料を用いた。この材料に
ついてＸ線回折測定を行った結果、（００２）面の面間
隔は３．７６Åであり、また真比重は１．５８であっ
た。このようにして得た炭素材料を９０重量％と結着剤
であるポリフッ化ビニリデン１０重量％とを混合して負
極合剤を作成し、これをＮ−メチル−２−ピロリドンに
分散させてスラリー状とした。次にこのスラリーを負極
集電体である帯状の銅箔の両面に塗布し、乾燥後ローラ
ープレス機で圧縮成形して負極を作成した。また、正極
と負極との間の絶縁体として厚さ２５μｍの微孔性ポリ
プロピレンフィルムから成る帯状セパレータを用いる。Next, a negative electrode active material was prepared as follows. A petroleum pitch is used as a starting material, and after introducing 10 to 20% of a functional group containing oxygen (so-called oxygen cross-linking), it is fired at 1000 ° C. in an inert gas to obtain a non-graphite having properties similar to glassy carbon. A carbonized material was used. X-ray diffraction measurement of this material showed that the (002) plane spacing was 3.76 ° and the true specific gravity was 1.58. 90% by weight of the carbon material thus obtained was mixed with 10% by weight of polyvinylidene fluoride as a binder to prepare a negative electrode mixture, which was dispersed in N-methyl-2-pyrrolidone to obtain a slurry. Shape. Next, this slurry was applied to both sides of a strip-shaped copper foil as a negative electrode current collector, dried, and compression-molded with a roller press to form a negative electrode. Further, a strip separator made of a microporous polypropylene film having a thickness of 25 μm is used as an insulator between the positive electrode and the negative electrode.
【０００９】次に上記帯状の正極と負極を用いて渦巻型
電極体を作製する手順を説明する。図１には円筒形の電
極体の円形断面での渦巻型電極体の作製工程を示し、図
２は得られた渦巻型電極体を用いた非水電解質二次電池
の円筒側面断面を示す。まず、図１（ａ）に示すよう
に、円筒の径方向にスリット状の貫通孔を形成した割り
ピン１６を用いて帯状のセパレータ３を巻き取る。この
とき割りピン１６の貫通孔にセパレータ３の端部を挿入
して割りピン１６を図１（ａ）の矢印方向に一回転させ
て図１（ｂ）に示すようにセパレータ３の端部を割りピ
ン１６の円筒側面に巻きつける。次に図１（ｃ）に示す
ように中空筒形の側面の一ケ所にスリット状の割りが入
った金属性のセンターピン１４内にセパレータ３が巻き
付いた割りピン１６を挿入する。この時、金属性のセン
ターピン１４の円筒方向の長さをセパレータ３の幅方向
の長さより短くして金属性のセンターピン１４がセパレ
ータ３からはみ出さないようにする。金属性のセンター
ピン１４内にセパレータ３が巻き付いた割りピン１６を
挿入し終わると、金属性のセンターピン１４を芯材とし
て図１（ｄ）に示すように帯状の正極２、負極１をセパ
レータ３を介して順々に巻き取る工程により渦巻型電極
体を作製する。その後、割りピン１６を抜き取る。Next, a procedure for manufacturing a spiral electrode body using the above-mentioned strip-shaped positive and negative electrodes will be described. FIG. 1 shows a manufacturing process of a spiral electrode body with a circular cross section of a cylindrical electrode body, and FIG. 2 shows a cylindrical side cross section of a nonaqueous electrolyte secondary battery using the obtained spiral electrode body. First, as shown in FIG. 1A, the strip-shaped separator 3 is wound up using a split pin 16 having a slit-shaped through-hole formed in the radial direction of the cylinder. At this time, the end of the separator 3 is inserted into the through hole of the split pin 16 and the split pin 16 is rotated once in the direction of the arrow in FIG. Wrap it around the cylindrical side of the split pin 16. Next, as shown in FIG. 1 (c), a split pin 16 around which the separator 3 is wound is inserted into a metallic center pin 14 having a slit-shaped split at one place on the side surface of the hollow cylindrical shape. At this time, the length of the metallic center pin 14 in the cylindrical direction is shorter than the length of the separator 3 in the width direction so that the metallic center pin 14 does not protrude from the separator 3. When the split pin 16 around which the separator 3 is wound is inserted into the metal center pin 14, the strip-shaped positive electrode 2 and the negative electrode 1 are separated by using the metal center pin 14 as a core material as shown in FIG. The spirally wound electrode body is manufactured by a step of sequentially winding through a coil 3. Thereafter, the split pin 16 is removed.
【００１０】次に、図２に示すようにニッケルメッキを
施した鉄製の電池缶５の底部に絶縁板４を挿入し、上記
渦巻型電極体を収納する。そして、負極１の集電をとる
ためにニッケル製の負極リード１２の一端を負極１に圧
着し、負極１の巻き付け端部に設けられる負極集電体１
０に接続する負極リード１２の他端を電池缶５の底部に
溶接した。また、正極２の集電をとるためにアルミニウ
ム製の正極リード１３の一端を正極２に取り付け、正極
リード１３の他端を電池内圧に応じて電流を遮断する電
池蓋７の安全弁装置８に溶接した。そして、この電池缶
５の中にプロピレンカーボネート５０容量％とジエチル
カーボネート５０容量％からなる混合溶媒中１リットル
当たりＬｉＰＦ6を１ｍｏｌ溶解させた電解質を注入し
た。そして、アスファルトを塗布した絶縁封口ガスケッ
ト６を介して電池缶５をかしめることで、電池蓋７を固
定して直径２０ｍｍ、高さ５０ｍｍ円筒型非水電解質二
次電池を作製した。Next, as shown in FIG. 2, an insulating plate 4 is inserted into the bottom of a nickel-plated iron battery can 5 to house the spiral electrode body. Then, in order to collect the current of the negative electrode 1, one end of a negative electrode lead 12 made of nickel is pressed against the negative electrode 1, and the negative electrode current collector 1 provided at the winding end of the negative electrode 1 is provided.
The other end of the negative electrode lead 12 connected to the battery can 5 was welded to the bottom of the battery can 5. In addition, one end of an aluminum positive electrode lead 13 is attached to the positive electrode 2 in order to collect the current of the positive electrode 2, and the other end of the positive electrode lead 13 is welded to a safety valve device 8 of a battery lid 7 for interrupting a current according to the internal pressure of the battery. did. Then, into the battery can 5, an electrolyte in which 1 mol of LiPF 6 was dissolved per liter in a mixed solvent composed of 50% by volume of propylene carbonate and 50% by volume of diethyl carbonate was injected. Then, the battery can 5 was caulked through the insulating sealing gasket 6 coated with asphalt to fix the battery lid 7 to produce a cylindrical nonaqueous electrolyte secondary battery having a diameter of 20 mm and a height of 50 mm.
【００１１】比較例 この比較例では、前記実施例の渦巻型電極体の作製工程
と比較して次の工程が異なる。それは、割りピン１６で
セパレータ３端部を初めに巻き取った後、帯状の正極
２、負極１をセパレータ３を介して順々に巻き取りその
巻芯２１の空隙部２２の割りピン１６の跡を先端の鋭利
なピン２３で成形して（図３参照）、その後にセンター
ピン１４を挿入する工程が前記実施例とは異なる。それ
以外の工程と材料は前記実施例と同一である。こうし
て、直径２０ｍｍ、高さ５０ｍｍの円筒型非水電解質二
次電池を作製した。その際、巻芯２１の空隙部２２の割
りピン１６の跡を先端の鋭利なピン２３で成形する工程
とセンターピン１４を挿入する工程で不良が発生した。
このようにして前記実施例と前記比較例でそれぞれ１０
０個ずつ電池を作製し、このうち２０個をそれぞれ任意
に抽出した。そして、上限電圧４．２Ｖ、電流１Ａの条
件で定電圧定電流充電を行った後、終止電圧２．７５
Ｖ、抵抗６Ωの条件で放電を行うといった充放電サイク
ルを繰り返し行い、１０サイクル目の放電容量および１
００サイクル目の放電容量を測定し、容量維持率［（１
００サイクル目の放電容量／１０サイクル目の放電容
量）×１００］を求めた。結果を表１と表２に示す。Comparative Example In this comparative example, the following steps are different from the spiral electrode body manufacturing process of the above embodiment. After first winding the end of the separator 3 with the split pin 16, the strip-shaped positive electrode 2 and the negative electrode 1 are sequentially wound through the separator 3, and the trace of the split pin 16 in the void portion 22 of the core 21. Is formed with a sharp pin 23 at the tip (see FIG. 3), and then the step of inserting the center pin 14 is different from that of the above embodiment. The other steps and materials are the same as those of the above embodiment. Thus, a cylindrical non-aqueous electrolyte secondary battery having a diameter of 20 mm and a height of 50 mm was produced. At this time, defects occurred in the step of forming the trace of the split pin 16 in the gap 22 of the core 21 with the sharp pin 23 and the step of inserting the center pin 14.
In this way, in each of the embodiment and the comparative example, 10
Zero batteries were produced, and 20 of them were arbitrarily extracted. Then, after performing constant voltage / constant current charging under the conditions of an upper limit voltage of 4.2 V and a current of 1 A, a final voltage of 2.75
The charge / discharge cycle of discharging under the conditions of V and a resistance of 6Ω is repeated.
The discharge capacity at the 00th cycle was measured, and the capacity retention rate [(1
(Discharge capacity at the 00th cycle / 10th cycle) × 100]. The results are shown in Tables 1 and 2.
【００１２】[0012]
【表１】 [Table 1]
【表２】 [Table 2]
【００１３】上述のように、本発明の実施例によれば、
中空筒の一ケ所に割りが入ったセンターピンを割りピン
に挿入してから後に帯状の正極、負極をセパレータを介
して巻き取ることにより、巻き取った状態ですでにセン
ターピンが挿入されているので、比較例のようにセンタ
ーピンを挿入するために割りピンの跡を先端の鋭利なピ
ンで成形する工程、成形した後にセンターピンを挿入す
る工程が不必要になる。こうして、比較例で述べたよう
なピンによる成形不良やセンターピン挿入不良が発生し
ないので不良率が下がり、なおかつ生産性が向上する。
また、巻芯空隙部の内径とセンターピンの外形にクリア
ランスがないため、巻きゆるみによるサイクル劣化が抑
制され、容量維持率が向上する。As described above, according to an embodiment of the present invention,
By inserting the center pin with a split in one place of the hollow cylinder into the split pin, and then winding the strip-shaped positive electrode and negative electrode through the separator, the center pin is already inserted in the wound state This eliminates the need for a step of forming the trace of the split pin with a sharp-pointed pin in order to insert the center pin as in the comparative example, and a step of inserting the center pin after the formation. In this manner, since there is no occurrence of molding failure and center pin insertion failure due to pins as described in the comparative example, the failure rate is reduced, and the productivity is improved.
Also, since there is no clearance between the inner diameter of the core gap and the outer shape of the center pin, cycle deterioration due to loose winding is suppressed, and the capacity retention rate is improved.
【００１４】[0014]
【発明の効果】本発明によれば、渦巻型電極体の成形工
程が簡略化し、しかも成形不良やセンターピン挿入不良
が発生しないので、作製される非水電解質二次電池の不
良率が下がり、なおかつ生産性が向上し、また、サイク
ル経過による渦巻型電極の巻きゆるみによる劣化が抑制
出来るため容量維持率が向上する。According to the present invention, since the molding process of the spiral electrode body is simplified and the molding failure and the center pin insertion failure do not occur, the defective rate of the manufactured non-aqueous electrolyte secondary battery decreases. In addition, the productivity is improved, and the deterioration due to the loosening of the spiral electrode due to the cycling can be suppressed, so that the capacity retention rate is improved.
【図１】 本発明の実施例の渦巻型電極体の円形断面図
である。FIG. 1 is a circular sectional view of a spiral electrode body according to an embodiment of the present invention.
【図２】 本発明の実施例の渦巻型電極体を用いた非水
電解質二次電池の円筒側面断面である。FIG. 2 is a cross-sectional side view of a cylinder of a nonaqueous electrolyte secondary battery using a spirally wound electrode body according to an embodiment of the present invention.
【図３】 従来の渦巻型電極体の巻芯空隙部の割りピン
跡の成形方法を説明する図である。FIG. 3 is a diagram illustrating a method of forming a trace of a split pin in a core void portion of a conventional spiral electrode body.
１…負極、２…正極、３…セパレータ、４…絶縁板、５
…電池缶、６…封口ガスケット、７…電池蓋、８…安全
弁装置、１０…負極集電体、１１…正極集電体、１２…
負極リード、１３…正極リード、１４…センターピン、
１６…割りピンDESCRIPTION OF SYMBOLS 1 ... Negative electrode, 2 ... Positive electrode, 3 ... Separator, 4 ... Insulating plate, 5
... battery can, 6 ... sealing gasket, 7 ... battery lid, 8 ... safety valve device, 10 ... negative electrode current collector, 11 ... positive electrode current collector, 12 ...
Negative electrode lead, 13: positive electrode lead, 14: center pin,
16… Split pins
Claims (4)
にセパレータを介して巻き取った形状の渦巻型電極体を
有する非水電解質二次電池において、 中空筒の長手方向にスリット状の割りが入ったセンター
ピンと、該センターピン内に一端が支持され、該センタ
ーピンのスリット状の割りを通してセンターピン表面に
巻き付けられた帯状のセパレータと、該セパレータを挟
んでセンターピン表面に巻き付けられた帯状の正極と負
極とからなる渦巻型電極体を備えたことを特徴とする非
水電解質二次電池。1. A non-aqueous electrolyte secondary battery having a strip-shaped positive electrode, a negative electrode, and a spiral electrode body wound around the positive electrode and the negative electrode with a separator interposed therebetween, wherein a slit is formed in the longitudinal direction of the hollow cylinder. And a band-shaped separator wound on the center pin surface through a slit-shaped split of the center pin, and wound around the center pin surface with the separator interposed therebetween. A non-aqueous electrolyte secondary battery comprising a spiral electrode body comprising a strip-shaped positive electrode and a negative electrode.
することを特徴とする請求項１記載の非水電解質二次電
池。2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the hollow cylindrical center pin is made of metal.
は、帯状のセパレータの幅方向の長さより短いことを特
徴とする請求項１または２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 length of the hollow cylindrical center pin in the longitudinal direction is shorter than the length of the strip-shaped separator in the width direction.
巻き取って得られる渦巻型電極体を有する非水電解質二
次電池において、 セパレータ端部を円柱形の長手方向に設けられた径方向
の貫通孔を設けられた割りピンの前記貫通孔に挿入し、
該割りピンで巻き取り、次いで、中空筒の長手方向にス
リット状の割りが入ったセンターピン内に前記セパレー
タを巻き付けた割りピンに挿入して、次いでセンターピ
ン表面に帯状の正極と負極をセパレータを介して巻き取
り、渦巻型電極体を作製することを特徴とする非水電解
質二次電池の製造方法。4. A non-aqueous electrolyte secondary battery having a spirally wound electrode body obtained by winding a strip-shaped positive electrode and a negative electrode through a separator, wherein a separator end is provided in a radial direction provided in a cylindrical longitudinal direction. Inserting into the through hole of the split pin provided with a through hole,
Winding with the split pin, then inserting the separator into a split pin with the separator wound in a center pin having a slit-shaped split in the longitudinal direction of the hollow cylinder, and then separating the strip-shaped positive and negative electrodes on the center pin surface. A method for producing a non-aqueous electrolyte secondary battery, wherein a spirally wound electrode body is produced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14567994A JP3348524B2 (en) | 1994-06-03 | 1994-06-03 | Non-aqueous electrolyte secondary battery and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14567994A JP3348524B2 (en) | 1994-06-03 | 1994-06-03 | Non-aqueous electrolyte secondary battery and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07335249A JPH07335249A (en) | 1995-12-22 |
| JP3348524B2 true JP3348524B2 (en) | 2002-11-20 |
Family
ID=15390588
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14567994A Expired - Fee Related JP3348524B2 (en) | 1994-06-03 | 1994-06-03 | Non-aqueous electrolyte secondary battery and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3348524B2 (en) |
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|---|---|---|---|---|
| KR100669337B1 (en) * | 2005-07-29 | 2007-01-16 | 삼성에스디아이 주식회사 | Secondary battery and fabrication method thereof |
| KR101010368B1 (en) * | 2006-09-18 | 2011-01-25 | 주식회사 엘지화학 | Process for Preparation of Jelly-roll Type Electrode Assembly |
| JP4803201B2 (en) * | 2008-04-04 | 2011-10-26 | トヨタ自動車株式会社 | Winding type battery and method of manufacturing winding type battery |
| CN105322234B (en) * | 2014-06-24 | 2017-12-19 | 中山天贸电池有限公司 | A kind of production method of electrodes of lithium-ion batteries winding |
| EP4394996A1 (en) * | 2022-05-13 | 2024-07-03 | Contemporary Amperex Technology Co., Limited | Electrode assembly, battery cell, battery and electrical device |
-
1994
- 1994-06-03 JP JP14567994A patent/JP3348524B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07335249A (en) | 1995-12-22 |
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