JP2005129366A - Secondary battery, and its manufacturing method and device - Google Patents

Secondary battery, and its manufacturing method and device Download PDF

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JP2005129366A
JP2005129366A JP2003363953A JP2003363953A JP2005129366A JP 2005129366 A JP2005129366 A JP 2005129366A JP 2003363953 A JP2003363953 A JP 2003363953A JP 2003363953 A JP2003363953 A JP 2003363953A JP 2005129366 A JP2005129366 A JP 2005129366A
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separator
secondary battery
negative electrode
positive electrode
winding
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Yasuyuki Suzuki
康之 鈴木
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Tokin Corp
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NEC Tokin Tochigi Ltd
NEC Tokin Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a secondary battery using a wound element preventing a short-circuit failure during a winding process, and to provide its manufacturing method and device. <P>SOLUTION: Either one of a positive electrode and a negative electrode is held between a first separator 4a and a second separator 4b. Terminal parts of winding in the first separator 4a and the second separator 4b are cut and joined with thermal fusion by a cut and thermal fusion device 1 integrating a blade 2 and a heating element 3. Forming a joint part 6 prevents the positive and negative electrodes from contacting due to bending of the terminal part of the separator during the winding process, allowing dramatically reduced short-circuit failures. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、リチウムイオン二次電池に代表される二次電池に関し、特に発電要素として、正負の電極を、セパレータを介在させて巻き回した、巻回素子を有する二次電池、及びその製造方法、並びに製造装置に関わるものである。   The present invention relates to a secondary battery typified by a lithium ion secondary battery, and in particular, a secondary battery having a winding element in which positive and negative electrodes are wound as a power generation element with a separator interposed therebetween, and a method for manufacturing the same. , As well as manufacturing equipment.

近年の電子機器、特に携帯電話、ノート型パーソナルコンピュータ、ビデオカメラなどの携帯用情報機器の発達や普及に伴い、小型、軽量で、かつエネルギー密度が高い二次電池の需要が大きく伸張し、なお、高性能化の検討がなされている。このような二次電池として特にリチウムイオン二次電池が、その高性能のため注目されている。   With the development and popularization of portable information devices such as mobile phones, notebook personal computers, and video cameras in recent years, the demand for secondary batteries that are small, lightweight, and have high energy density has greatly increased. Considering higher performance. As such a secondary battery, a lithium ion secondary battery is particularly attracting attention because of its high performance.

リチウムイオン二次電池の一般的な構造は、リチウム−コバルト複合酸化物などの正極活物質粉末、導電性粉末、及びバインダからなる正極活物質層を、アルミニウム箔からなる正極集電体表面に形成してなる正極電極、炭素系の負極活物質粉末、及びバインダからなる負極活物質層を、銅箔からなる負極集電体表面に形成してなる負極電極を、多孔質のフィルムからなるセパレータを介して重ね、電解液を含浸したものである。   The general structure of a lithium ion secondary battery is that a positive electrode active material layer made of a positive electrode active material powder such as lithium-cobalt composite oxide, a conductive powder, and a binder is formed on the surface of a positive electrode current collector made of aluminum foil. A negative electrode formed by forming a negative electrode active material layer made of a copper foil on a negative electrode current collector surface made of a copper foil, and a separator made of a porous film. And are impregnated with an electrolytic solution.

そして、二次電池としての容量増加のため、正極電極及び負極電極の対を複数積層した積層素子や、帯状に形成した正極電極及び負極電極を巻き回した巻回素子などが用いられているが、いずれの場合も電解液を用いるので、このような素子を金属のケースに封入したり、金属箔と高分子フィルムからなるラミネートフィルムで封止したりすることで、電解液が外部に漏れないようにしている。   In order to increase the capacity of the secondary battery, a laminated element in which a plurality of pairs of a positive electrode and a negative electrode are laminated, a winding element in which a positive electrode and a negative electrode formed in a strip shape are wound, and the like are used. In any case, since an electrolytic solution is used, such an element is sealed in a metal case or sealed with a laminate film made of a metal foil and a polymer film, so that the electrolytic solution does not leak to the outside. I am doing so.

積層素子と巻回素子は用途によって使い分けられていて、巻回素子の製法は、前記のように帯状の集電体表面に電極活物質層を形成した正負の電極を、電極間の絶縁を確保するためのセパレータを介在させた状態で重ね、巻き回すというものである。巻き回しの際、正負の電極の始端を、巻芯に固定し、巻芯を回転させて電極を巻き取るというのが一般的である。   Laminated elements and wound elements are properly used depending on the application. The winding element manufacturing method ensures positive and negative electrodes with the electrode active material layer formed on the surface of the belt-like current collector as described above, and ensures insulation between the electrodes. In this state, the separators are stacked and wound with a separator interposed between them. At the time of winding, it is common to fix the starting ends of the positive and negative electrodes to the core, and to wind the electrode by rotating the core.

しかし、終端側を完全に固定すると、巻き回しの作業自体が困難になるので、特別な保持機構が必要となり、正負の電極とセパレータの積層体の両面に、ノズルを用いて高圧に圧縮した空気を吹き付け、位置を保持することが行われている。   However, if the terminal side is completely fixed, the winding work itself becomes difficult, so a special holding mechanism is required, and air compressed to high pressure using a nozzle on both sides of the laminate of positive and negative electrodes and separators. It is done to spray and hold the position.

図２は、巻き回し工程における巻回素子を模式的に示した断面図である。図２において、８ａは正極電極、８ｂは負極電極、９ａは第一のセパレータ、９ｂは第二のセパレータ、１０は巻芯、１１は空気を吹き付ける方向である。   FIG. 2 is a cross-sectional view schematically showing a winding element in the winding process. In FIG. 2, 8a is a positive electrode, 8b is a negative electrode, 9a is a first separator, 9b is a second separator, 10 is a core, and 11 is a direction in which air is blown.

このような方法で、電極及びセパレータの終端の位置を保持する際の問題点は、一定の位置に保持するのが、機械的に固定する方法に比較して困難なことは勿論であるが、空気圧の変動などで、電極またはセパレータの端部が折れ曲がることがあり、絶縁不良の原因となることである。   Of course, it is difficult to maintain the positions of the terminal ends of the electrode and the separator in such a method as compared with the mechanical fixing method. The end portion of the electrode or separator may be bent due to fluctuations in air pressure, etc., which causes insulation failure.

図３は、セパレータの端部が折れ曲がった状態の巻回素子の斜視図である。図３において、１２ａは正極の電流取出部、１２ｂは負極の電流取出部である。図３に示したようにセパレータ８ｂの端部の隅がめくれて折れ曲がると、正極電極８ａの端部と負極電極８ｂの端部の接触が起こり、短絡による不良が生じる。   FIG. 3 is a perspective view of the winding element in a state where the end of the separator is bent. In FIG. 3, 12a is a positive current extraction part, and 12b is a negative current extraction part. As shown in FIG. 3, when the corner of the end portion of the separator 8b is turned and bent, contact between the end portion of the positive electrode 8a and the end portion of the negative electrode 8b occurs, and a defect due to a short circuit occurs.

特許文献１には、巻回素子における正負の電極の終端に絶縁材を設けることで、経年変化や外部からの圧力による正極電極と負極電極との電気的短絡を防止する技術が開示されている。しかしながら、前記のような、巻き回し工程におけるセパレータの折れ曲がりに対処する方法は、何ら開示されていない。   Patent Document 1 discloses a technique for preventing an electrical short circuit between a positive electrode and a negative electrode due to secular change or external pressure by providing an insulating material at the terminal of positive and negative electrodes in a winding element. . However, there is no disclosure of a method for dealing with the bending of the separator in the winding process as described above.

特開２００１−２６６９４６号公報JP 2001-266946 A

従って、本発明の課題は、巻き回し工程における短絡不良が生じない、巻回素子を用いた二次電池、及びその製造方法、並びに製造装置を提供することにある。   Therefore, the subject of this invention is providing the secondary battery using the winding element which does not produce the short circuit defect in a winding process, its manufacturing method, and a manufacturing apparatus.

本発明は、前記の巻き回し工程におけるセパレータの折れ曲がり防止には、２枚のセパレータの終端部の接合が極めて有効であり、セパレータに熱可塑性高分子からなる多孔質フィルムを用いた場合、加熱して圧接することで、容易に熱融着できることに着眼し、これを実現する方法と、装置を検討した結果なされたものである。   The present invention is very effective in preventing the separator from being bent in the winding step, and when the porous film made of a thermoplastic polymer is used for the separator, the separator is heated. As a result of studying a method and an apparatus for realizing this, it is possible to easily heat-seal by pressure welding.

即ち、本発明は、正極集電体の表面に正極電極活物質層が形成された正極電極と、負極集電体の表面に負極電極活物質層が形成された負極電極と、正極電極及び負極電極のそれぞれに、セパレータを重ねた状態で巻き回してなる巻回素子を有する二次電池において、前記２枚のセパレータの巻き回し終端または終端の近傍に、２枚のセパレータを接合した接合部が形成されてなることを特徴とする二次電池である。   That is, the present invention relates to a positive electrode in which a positive electrode active material layer is formed on the surface of a positive electrode current collector, a negative electrode in which a negative electrode active material layer is formed on the surface of a negative electrode current collector, a positive electrode and a negative electrode In the secondary battery having a winding element formed by winding the separator on each of the electrodes, a joining portion in which the two separators are joined at or near the winding end of the two separators. It is a secondary battery characterized by being formed.

また、本発明は、正極集電体の表面に正極電極活物質層を形成した正極電極と、負極集電体の表面に負極電極活物質層を形成した負極電極とを、正極電極及び負極電極のそれぞれに、セパレータを重ねた状態で巻き回して、巻回素子を作製する工程を含む二次電池の製造方法において、前記セパレータの巻き回しの終端または終端の近傍に、２枚のセパレータを接合した接合部を形成することを特徴とする二次電池の製造方法である。   The present invention also provides a positive electrode in which a positive electrode active material layer is formed on the surface of a positive electrode current collector, and a negative electrode in which a negative electrode active material layer is formed on the surface of a negative electrode current collector. In the method of manufacturing a secondary battery including a step of manufacturing a wound element by winding each of the separators in a state where the separators are stacked, two separators are joined at or near the terminal end of the separator winding. The method for manufacturing a secondary battery is characterized in that the formed junction is formed.

また、本発明は、前記セパレータが、熱可塑性高分子からなり、前記接合部は、熱融着により形成されることを特徴とする、前記の二次電池の製造方法である。   In addition, the present invention provides the method for manufacturing a secondary battery, wherein the separator is made of a thermoplastic polymer, and the joining portion is formed by heat fusion.

また、本発明は、前記セパレータを切断するブレードと、前記セパレータに当接して熱融着するための加熱素子が一体に設けられた切断融着装置を有することを特徴とする、前記の二次電池の製造装置である。   Further, the present invention is characterized in that it has the above-mentioned secondary welding device, characterized in that it has a cutting and fusing device in which a blade that cuts the separator and a heating element that abuts on the separator and heat fusing is integrally provided. This is a battery manufacturing apparatus.

本発明の二次電池においては、発電要素を構成する巻回素子のセパレータの、巻き回し終端に、接合部が形成されているので、セパレータの折れ曲がりによる、正負の電極の接触が起こることがなく、巻き回し工程における短絡不良が極めて少なくなる。   In the secondary battery of the present invention, since the joining portion is formed at the winding end of the separator of the winding element that constitutes the power generation element, there is no contact between the positive and negative electrodes due to the bending of the separator. Short circuit failure in the winding process is extremely reduced.

しかも、このような目的のための接合は、ピンポイントに近い、狭い領域のみの接合を、２箇所程度行うだけで十分なので、セパレータの熱可塑性を利用すれば、容易に実施できる。また、それに用いる装置も、セパレータの切断装置に、切断用ブレードと熱融着用の加熱素子を併設するだけで十分であり、切断の際に、加熱素子を圧接するだけで接合できる。   Moreover, it is sufficient to perform joining for such a purpose only by joining only two narrow areas close to the pinpoint, and therefore can be easily performed by utilizing the thermoplasticity of the separator. In addition, it is sufficient that the apparatus used therefor is provided with a cutting blade and a heat-fusing heating element in addition to the separator cutting apparatus, and can be joined by simply pressing the heating element at the time of cutting.

図１は、本発明の実施の形態に関わる、ブレード及び加熱素子が一体に設けられた切断融着装置の一例を示す図で、図１（ａ）は斜視図、図１（ｂ）はセパレータの切断及び熱融着を行う状態を模式的に示した図である。図１において、１はブレード及び加熱素子を一体化した切断融着装置、２はブレード、３は加熱素子、４ａは第一のセパレータ、４ｂは第二のセパレータ、５は電極、６はセパレータの接合部、７はセパレータが切断された箇所である。   FIG. 1 is a view showing an example of a cutting and fusing device in which a blade and a heating element are integrally provided according to an embodiment of the present invention, FIG. 1 (a) is a perspective view, and FIG. 1 (b) is a separator. It is the figure which showed typically the state which performs cutting | disconnection and heat sealing | fusion. In FIG. 1, 1 is a cutting and fusing device in which a blade and a heating element are integrated, 2 is a blade, 3 is a heating element, 4a is a first separator, 4b is a second separator, 5 is an electrode, and 6 is a separator. A joint portion 7 is a portion where the separator is cut.

図１の切断融着装置１は、金属、または、たとえば窒化アルミニウムのような熱伝導率の高いセラミックからなり、内蔵するヒータや誘導加熱などで昇温した状態で用いる。また、図１に示した例では、加熱素子３よりもブレード２の方が、図１における右の方に突き出た形状になっている。   The cutting and fusing apparatus 1 shown in FIG. 1 is made of a metal or a ceramic having high thermal conductivity such as aluminum nitride, and is used in a state of being heated by a built-in heater or induction heating. Further, in the example shown in FIG. 1, the blade 2 protrudes to the right in FIG. 1 rather than the heating element 3.

このような形状にすることで、第一のセパレータ４ａ、第二のセパレータ４ｂを重ねた状態で、切断融着装置１を用いて、図１における左右から挟んで圧接すると、左右のブレード２の先端が接触する状態でも、左右の加熱素子３の先端間には空隙が生じる。つまり、第一のセパレータ４ａ、第二のセパレータ４ｂにおける、ブレード２が当接した部分は、溶融して切断されるのに対し、加熱素子３が当接したセパレータ４ａ、４ｂの部分は溶融しても切断されず、熱融着により接合される。   By adopting such a shape, when the first separator 4a and the second separator 4b are overlapped and pressed with the cutting and fusing device 1 from the left and right in FIG. Even in the state where the tips contact, a gap is generated between the tips of the left and right heating elements 3. That is, in the first separator 4a and the second separator 4b, the portion where the blade 2 abuts is melted and cut, whereas the portion of the separator 4a, 4b where the heating element 3 abuts is melted. Even if it does not cut | disconnect, it joins by heat sealing | fusion.

切断融着装置１は、図１における左右に対で配置してもよいが、片側は単なる板状の部材としてもよい。また、図１に示した例では、ブレード２の先端を平坦な形状としたがエッジとしてもよいし、加熱素子３の先端を円形としたが、四角形などの形状にしてもよいことは勿論である。   The cutting and fusing device 1 may be arranged in pairs on the left and right in FIG. 1, but one side may be a simple plate-like member. In the example shown in FIG. 1, the tip of the blade 2 has a flat shape, but it may have an edge, and the tip of the heating element 3 has a circular shape. is there.

次に、具体的な実施例を挙げ、本発明についてさらに詳しく説明する。なお、ここでは、図１を参照して説明する。   Next, the present invention will be described in more detail with specific examples. Here, description will be given with reference to FIG.

まず、電極の調製方法について説明する。ここでは、集電体として正極には厚みが１５μｍのアルミニウム箔、負極には厚みが１０μｍの銅箔を用いた。   First, a method for preparing an electrode will be described. Here, an aluminum foil having a thickness of 15 μm was used for the positive electrode as the current collector, and a copper foil having a thickness of 10 μm was used for the negative electrode.

次に、正極電極の作製について説明する。まず、炭酸リチウムと炭酸コバルトを、リチウムとコバルトのモル比が１：１になるように混合し、空気中で９００℃、５時間焼成した。この焼成体を粉砕し、平均粒径が６μｍの焼成粉末とした。さらに得られた焼成粉末と炭酸リチウム粉末を、重量比で９５／５となるように混合した。   Next, production of the positive electrode will be described. First, lithium carbonate and cobalt carbonate were mixed so that the molar ratio of lithium to cobalt was 1: 1, and baked in air at 900 ° C. for 5 hours. The fired body was pulverized to obtain a fired powder having an average particle size of 6 μm. Further, the obtained fired powder and lithium carbonate powder were mixed so that the weight ratio was 95/5.

前記混合粉末と、導電材としてのグラファイトと、バインダとしてのポリフッ化ビニリデンを、重量比で９１／６／３となるように秤量混合し、Ｎ−メチル−２−ピロリドンに分散して正極電極活物質層形成用ペーストとした。このペーストを集電体の両面に、溶媒を除去した後の厚みが１００μｍとなるように塗布、乾燥して正極電極を得た。   The mixed powder, graphite as a conductive material, and polyvinylidene fluoride as a binder are weighed and mixed at a weight ratio of 91/6/3, dispersed in N-methyl-2-pyrrolidone, and positive electrode active The material layer forming paste was obtained. This paste was applied to both sides of the current collector so that the thickness after removing the solvent was 100 μm and dried to obtain a positive electrode.

次に、負極電極の作製について説明する。フェノール樹脂を不活性ガス気流中で焼成後、粉砕して得られた平均粒径７μｍの炭素材料と、バインダとしてのポリフッ化ビニリデンを、重量比で９０／１０となるように秤量混合し、Ｎ−メチル−２−ピロリドンに分散して負極電極活物質層形成用のペーストとした。この後は正極電極と同様にして負極電極を得た。   Next, production of the negative electrode will be described. A carbon material having an average particle diameter of 7 μm obtained by firing and pulverizing a phenol resin in an inert gas stream, and polyvinylidene fluoride as a binder are weighed and mixed so that the weight ratio is 90/10. -Dispersed in methyl-2-pyrrolidone to obtain a paste for forming a negative electrode active material layer. Thereafter, a negative electrode was obtained in the same manner as the positive electrode.

セパレータには、厚みが２０μｍの多孔質ポリプロピレンシートを用いた。そして、前記の負極電極を、図１における電極５として、第一のセパレータ４ａ及び第二のセパレータ４ｂの間に挟んで、電極５の終端を金属の基板上（図示せず）に配置して、切断融着装置１を圧接し、切断と熱融着を同時に行い、負極電極とセパレータの積層体を得た。なお、ブレード２と加熱素子３は、温度を２８０±３℃に保持した。   As the separator, a porous polypropylene sheet having a thickness of 20 μm was used. Then, the negative electrode is placed as the electrode 5 in FIG. 1 between the first separator 4a and the second separator 4b, and the terminal of the electrode 5 is disposed on a metal substrate (not shown). Then, the cutting and fusing device 1 was pressure-contacted, and cutting and heat fusion were performed simultaneously to obtain a laminate of a negative electrode and a separator. The blade 2 and the heating element 3 kept the temperature at 280 ± 3 ° C.

次に、正極電極と前記の負極電極とセパレータの積層体を巻き回し、巻回素子を得た。この巻回素子をアルミニウム製のケースに挿入し、正極及び負極の端子を取り付け、プロピレンカーボネートに、テトラエチルアンニウムテトラフルオロホウ酸塩を、１モル／Ｌの濃度で溶解した電解液を注入した。引き続き、ケースに蓋を取り付けて封口を行い、二次電池を得た。   Next, the laminate of the positive electrode, the negative electrode, and the separator was wound to obtain a wound element. This winding element was inserted into an aluminum case, positive and negative terminals were attached, and an electrolytic solution in which tetraethylanium tetrafluoroborate was dissolved in propylene carbonate at a concentration of 1 mol / L was injected. Subsequently, a lid was attached to the case and sealed to obtain a secondary battery.

このようにして、得られた二次電池では、従来の製造方法による二次電池に比較して、セパレータの折れ曲がりによる絶縁不良の発生率が、１％以下になった。   Thus, in the obtained secondary battery, compared with the secondary battery by the conventional manufacturing method, the incidence rate of the insulation failure by the bending of the separator became 1% or less.

なお、前記実施例では、リチウムイオン二次電池を例に挙げて説明したが、他の二次電池や、同様の構造を有する電気化学セルにも適用できることは明らかである。   In addition, although the said Example demonstrated and demonstrated the lithium ion secondary battery as an example, it is clear that it is applicable also to another secondary battery and the electrochemical cell which has the same structure.

ブレード及び加熱素子が一体に設けられた装置の一例を示す図。図１（ａ）は斜視図。図1（ｂ）はセパレータの切断及び熱融着を行う状態を模式的に示した図。The figure which shows an example of the apparatus with which the braid | blade and the heating element were provided integrally. FIG. 1A is a perspective view. FIG. 1B schematically shows a state in which the separator is cut and heat-sealed. 巻き回し工程における巻回素子を模式的に示した断面図。Sectional drawing which showed typically the winding element in the winding process. セパレータの端部が折れ曲がった状態の巻回素子の斜視図。The perspective view of the winding element in the state where the edge part of the separator was bent.

符号の説明Explanation of symbols

１ 切断融着装置
２ ブレード
３ 加熱素子
４ａ，９ａ 第一のセパレータ
４ｂ，９ｂ 第二のセパレータ
５ 電極
６ セパレータの接合部
７ セパレータが切断された箇所
８ａ 正極電極
８ｂ 負極電極
１０ 巻芯
１１ 空気を吹き付ける方向
１２ａ 正極の電流取出部
１２ｂ 負極の電流取出部 DESCRIPTION OF SYMBOLS 1 Cutting | fusion fusion apparatus 2 Blade 3 Heating element 4a, 9a 1st separator 4b, 9b 2nd separator 5 Electrode 6 Separator junction part 7a The location where the separator was cut 8a Positive electrode 8b Negative electrode 10 Core 11 Air Spray direction 12a Positive current extraction part 12b Negative current extraction part

Claims (4)

正極集電体の表面に正極電極活物質層が形成された正極電極と、負極集電体の表面に負極電極活物質層が形成された負極電極と、正極電極及び負極電極のそれぞれに、セパレータを重ねた状態で巻き回してなる巻回素子を有する二次電池において、前記２枚のセパレータの巻き回し終端または終端の近傍に、２枚のセパレータを接合した接合部が形成されてなることを特徴とする二次電池。  A positive electrode with a positive electrode active material layer formed on the surface of the positive electrode current collector, a negative electrode with a negative electrode active material layer formed on the surface of the negative electrode current collector, a separator on each of the positive electrode and the negative electrode In a secondary battery having a winding element that is wound in a state where the two separators are stacked, a joining portion in which the two separators are joined is formed at or near the winding end of the two separators. Secondary battery characterized. 正極集電体の表面に正極電極活物質層を形成した正極電極と、負極集電体の表面に負極電極活物質層を形成した負極電極とを、正極電極及び負極電極のそれぞれに、セパレータを重ねた状態で巻き回して、巻回素子を作製する工程を含む二次電池の製造方法において、前記セパレータの巻き回しの終端または終端の近傍に、２枚のセパレータを接合した接合部を形成することを特徴とする二次電池の製造方法。  A positive electrode having a positive electrode active material layer formed on the surface of the positive electrode current collector, a negative electrode having a negative electrode active material layer formed on the surface of the negative electrode current collector, and a separator on each of the positive electrode and the negative electrode. In a manufacturing method of a secondary battery including a step of producing a wound element by winding in an overlapped state, a joining portion in which two separators are joined is formed at or near the end of winding of the separator. A method for producing a secondary battery. 前記セパレータは、熱可塑性高分子からなり、前記接合部は、熱融着により形成されることを特徴とする、請求項２に記載の二次電池の製造方法。  The method of manufacturing a secondary battery according to claim 2, wherein the separator is made of a thermoplastic polymer, and the joining portion is formed by heat fusion. 前記セパレータを切断するブレードと、前記セパレータに当接して熱融着するための加熱素子が一体に設けられた切断融着装置を有することを特徴とする、請求項１に記載の二次電池の製造装置。  2. The secondary battery according to claim 1, further comprising a cutting and fusing device in which a blade that cuts the separator and a heating element that is in contact with the separator and thermally fused are integrally provided. 3. manufacturing device.
JP2003363953A 2003-10-24 2003-10-24 Secondary battery, and its manufacturing method and device Pending JP2005129366A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009289570A (en) * 2008-05-29 2009-12-10 Sony Corp Rolled electrode, non-aqueous electrolyte secondary battery, and method of manufacturing rolled electrode
JP2011090917A (en) * 2009-10-23 2011-05-06 Hitachi Maxell Ltd Nonaqueous secondary battery, and manufacturing method thereof
EP2866293B1 (en) * 2013-06-28 2018-01-10 LG Chem, Ltd. Method for manufacturing electrode assembly including separator cutting process
CN112913048A (en) * 2018-11-07 2021-06-04 大众汽车股份公司 Method for producing a cathode arrangement, method for producing an electrode composite and battery
CN114039103A (en) * 2021-10-26 2022-02-11 三一技术装备有限公司 Production method and production device of winding battery cell

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
JP2011090917A (en) * 2009-10-23 2011-05-06 Hitachi Maxell Ltd Nonaqueous secondary battery, and manufacturing method thereof
EP2866293B1 (en) * 2013-06-28 2018-01-10 LG Chem, Ltd. Method for manufacturing electrode assembly including separator cutting process
US10069169B2 (en) 2013-06-28 2018-09-04 Lg Chem, Ltd. Electrode assembly manufacturing method including separator cutting process
US10818974B2 (en) 2013-06-28 2020-10-27 Lg Chem, Ltd. Electrode assembly manufacturing method including separator cutting process
CN112913048A (en) * 2018-11-07 2021-06-04 大众汽车股份公司 Method for producing a cathode arrangement, method for producing an electrode composite and battery
CN114039103A (en) * 2021-10-26 2022-02-11 三一技术装备有限公司 Production method and production device of winding battery cell
CN114039103B (en) * 2021-10-26 2023-09-08 三一技术装备有限公司 Production method and production device of winding battery core

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