JP2007317638A - Electrode assembly excellent in structural stability and wettability of electrolyte solution and secondary battery containing above - Google Patents

Electrode assembly excellent in structural stability and wettability of electrolyte solution and secondary battery containing above Download PDF

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JP2007317638A
JP2007317638A JP2007051843A JP2007051843A JP2007317638A JP 2007317638 A JP2007317638 A JP 2007317638A JP 2007051843 A JP2007051843 A JP 2007051843A JP 2007051843 A JP2007051843 A JP 2007051843A JP 2007317638 A JP2007317638 A JP 2007317638A
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electrode assembly
separation film
hole
electrode
separation
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Ji Heon Ryu
リュー、ジ、ヘオン
Jeong Hee Choi
チェ、ジョン、ヒー
Seung-Jin Yang
ヤン、スン‐ジン
Young Joon Shin
シン、ヨンジューン
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LG Chem Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0459—Cells or batteries with folded separator between plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0583—Construction or manufacture of accumulators with folded construction elements except wound ones, i.e. folded positive or negative electrodes or separators, e.g. with "Z"-shaped electrodes or separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H01M50/461—Separators, membranes or diaphragms characterised by their combination with electrodes with adhesive layers between electrodes and separators
    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrode assembly with structurally stable for an external shock, preventing an electrode pushing phenomenon and improving wettability of the electrode assembly to electrolyte solution, capable of ultimately improving safety, performance and life characteristics of a battery, and a secondary battery containing it. <P>SOLUTION: The electrode assembly has a structure winding a plurality of laminated unit cells by a separation film of a long sheet shape, a plurality of through-holes for making it easy for electrolyte solution to go in and out are formed at a part of the separation film surrounding a side face of the electrode assembly in the separation film. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、構造的安定性と電解液に対する濡れ性に優れた電極組立体に関し、より詳しくは、複数の積層状単位セルを長いシート状の分離フィルムで巻き取った構造からなり、前記分離フィルムのうち、電極組立体の側面を取り囲む分離フィルムの当該部位には、電解液の出入りを容易にする複数の貫通孔が形成されていることを特徴とする電極組立体、及びそのような電極組立体を含んでなる二次電池に関する。   The present invention relates to an electrode assembly excellent in structural stability and wettability with respect to an electrolytic solution, and more specifically, has a structure in which a plurality of laminated unit cells are wound with a long sheet-like separation film, and the separation film Among the above, an electrode assembly characterized in that a plurality of through holes for facilitating the entry and exit of the electrolyte solution are formed in the portion of the separation film surrounding the side surface of the electrode assembly, and such an electrode assembly The present invention relates to a secondary battery including a solid.

モバイル機器に対する技術開発と需要の増加により、二次電池の需要も急増しており、その中でも、エネルギー密度と作動電圧が高く、保存と寿命特性に優れたリチウム二次電池は、各種のモバイル機器はもとより、様々な電子製品のエネルギー源として広く用いられている。   Due to technological development and increasing demand for mobile devices, the demand for secondary batteries is also increasing rapidly. Among them, lithium secondary batteries with high energy density, high operating voltage, and excellent storage and life characteristics are used in various mobile devices. Besides, it is widely used as an energy source for various electronic products.

二次電池は、外部及び内部の構造的特徴により、ほぼ円筒形電池、角形電池及びパウチ形電池に分類され、その中でも、高い集積度で積層され、長さに対して小さな幅を有した角形電池とパウチ形電池が特に注目されている。   Secondary batteries are classified into almost cylindrical batteries, prismatic batteries and pouch-type batteries according to external and internal structural characteristics. Among them, prismatic batteries are stacked with a high degree of integration and have a small width with respect to the length. Batteries and pouch-type batteries are particularly attracting attention.

二次電池を構成する正極／分離膜／負極構造の電極組立体は、その構造により、ジェリーロール型（巻取型）またはスタック型（積層型）に大別される。ジェリーロール型の電極組立体は、集電体として用いられる金属箔に電極活物質などをコートし、乾燥及びプレスした後、所望の幅と長さのバンド状に裁断し、分離膜を用いて負極と正極を隔膜した後、螺旋状に巻き取って製造される。ジェリーロール型電極組立体は、円筒状電池には適合しているが、角形またはパウチ形電池に適用するにおいては、電極活物質の剥離問題、低い空間活用性などの短所を有している。これに対して、スタック型電極組立体は、複数の正極及び負極単位セルを順次積層した構造であり、角形の形態が容易に得られるという長所があるが、製造過程が煩雑であり、衝撃が加えられたとき、電極が押されて短絡が引き起こされるという短所があった。   The electrode assemblies having a positive electrode / separation membrane / negative electrode structure constituting the secondary battery are roughly classified into a jelly roll type (winding type) or a stack type (stacked type) depending on the structure. A jelly roll type electrode assembly is formed by coating a metal foil used as a current collector with an electrode active material and the like, drying and pressing, cutting into a band having a desired width and length, and using a separation membrane. After the negative electrode and the positive electrode are separated, they are manufactured by winding them in a spiral shape. The jelly roll type electrode assembly is suitable for a cylindrical battery, but has disadvantages such as a problem of electrode active material peeling and low space utilization when applied to a prismatic or pouch battery. On the other hand, the stack type electrode assembly has a structure in which a plurality of positive and negative unit cells are sequentially stacked, and has an advantage that a square shape can be easily obtained. When added, there was a disadvantage that the electrode was pushed and a short circuit was caused.

このような問題点を解決するために、前記ジェリーロール型とスタック型の混合形態である一歩進んだ構造の電極組立体であって、一定の単位サイズの正極／分離膜／負極構造のフルセルまたは正極（負極）／分離膜／負極（正極）／分離膜／正極（負極）構造のバイセルを長い長さの連続的な分離フィルムを用いて、フォールドした構造のスタック−フォールド型電極組立体が開発され、これは、本出願人による特許文献１乃至３に詳細に開示されている。   In order to solve such a problem, an electrode assembly having an advanced structure which is a mixed form of the jelly roll type and the stack type, and is a full cell of a positive unit / separation membrane / negative electrode structure having a certain unit size or Developed a stack-fold type electrode assembly with a folded structure using bi-cells of positive electrode (negative electrode) / separation membrane / negative electrode (positive electrode) / separation membrane / positive electrode (negative electrode) structure with a long continuous separation film. This is disclosed in detail in US Pat.

一般に、スタック−フォールド型電極組立体は、その外面が分離フィルムで取り囲んでおり、一部のフルセルまたはバイセルの側面で、分離フィルムが多層に存在するので、電池の製造過程において、電解液の含浸時、濡れ性に劣るという短所を有している。電解液は、電池の作動に必須な構成要素であるので、電解液の低い濡れ性は、電池の性能低下及び寿命短縮などをもたらす。   Generally, a stack-fold type electrode assembly has an outer surface surrounded by a separation film, and a separation film exists in multiple layers on the side of some full cells or bi-cells. Sometimes it has the disadvantage of poor wettability. Since the electrolytic solution is an essential component for the operation of the battery, the low wettability of the electrolytic solution results in a decrease in battery performance and a shortened life.

また、本出願人による特許文献４には、電極組立体の濡れ性を向上させるために、正極と負極、及びその間に介在される分離膜に貫通孔を形成する技術が開示されている。しかし、上述した技術は、電極そのものに孔を開けるので、孔のサイズだけ容量が減少するようになり、電極に孔を開ける過程において、バリが発生し、短絡が引き起こされる可能性が極めて高く、正極と負極、及び分離膜の組立時、それぞれの貫通孔を一致させ、または分離膜の孔を分極の孔よりも大きく維持させなければならないので、電池の製造工程が極めて精密に制御されなければならないという問題点があった。   Further, Patent Document 4 by the present applicant discloses a technique for forming a through hole in a positive electrode, a negative electrode, and a separation membrane interposed therebetween in order to improve the wettability of the electrode assembly. However, since the technique described above makes a hole in the electrode itself, the capacity decreases by the size of the hole, and in the process of making a hole in the electrode, there is a high possibility that a burr will occur and a short circuit will be caused. When assembling the positive electrode, the negative electrode, and the separation membrane, the through-holes must be matched or the separation membrane hole must be kept larger than the polarization hole, so the battery manufacturing process must be controlled very precisely. There was a problem of not becoming.

また、特許文献５には、積層型電極組立体の積層構造を維持するために、その外面を多孔性フィルムで再度取り囲む技術が開示されている。しかしながら、このような技術は、設計寿命を増加させるために、従来のスタック型電極組立体の外面を別途のフィルム部材で再度取り囲むので、電池の製造工程が複雑であり、体積の増加が不可避であり、外部衝撃の印加時、フィルム部材に接しない電極組立体の内側の電極が依然として押される現象が発生する。しかも、電極組立体を構成する分離膜よりも大きな隙間を有するフィルム部材を用いるとしても、フィルム部材で取り囲む前のスタック型電極組立体に比べて濡れ性が大きく低減するという短所があった。   Patent Document 5 discloses a technique of surrounding the outer surface again with a porous film in order to maintain the laminated structure of the laminated electrode assembly. However, such a technique re-encloses the outer surface of the conventional stacked electrode assembly with a separate film member in order to increase the design life, so that the battery manufacturing process is complicated and the increase in volume is inevitable. In addition, when an external impact is applied, a phenomenon occurs in which the electrode inside the electrode assembly that does not contact the film member is still pushed. Moreover, even when a film member having a gap larger than that of the separation membrane constituting the electrode assembly is used, there is a disadvantage that wettability is greatly reduced as compared with the stack type electrode assembly before being surrounded by the film member.

したがって、外部衝撃の印加時、電極の押され現象を抑制し、電池の安全性を向上させ、電解液に対する電極組立体の濡れ性を効率よく向上させることにより、前記問題点を解決することができる技術に対する必要性が高いことが実状である。
韓国特許出願公開第２００１−８２０５８号公報 韓国特許出願公開第２００１−８２０５９号公報 韓国特許出願公開第２００１−８２０６０号公報 韓国特許出願公開第２００２−６５２９３号公報 日本国特開２００５−２９４１５０号公報 Therefore, when the external impact is applied, the above-mentioned problem can be solved by suppressing the electrode pressing phenomenon, improving the safety of the battery, and efficiently improving the wettability of the electrode assembly with respect to the electrolyte. The reality is that there is a high need for technology that can be used.
Korean Patent Application Publication No. 2001-82058 Korean Patent Application Publication No. 2001-82059 Korean Patent Application Publication No. 2001-82060 Korean Patent Application Publication No. 2002-65293 Japanese Unexamined Patent Publication No. 2005-294150

本発明は、上述の問題点に鑑みてなされたもので、その目的は、複数の積層型単位セルを長いシート状の分離フィルムで巻き取って電極組立体の構造を形成し、前記電極組立体の側面を取り囲む分離フィルムの当該部位に電解液の出入りを容易にする複数の貫通孔を形成することにより、外部衝撃に対しても構造的に安定であり、電極押され現象を防止し、電解液に対する電極組立体の濡れ性を向上させ、究極的に電池の安全性、性能及び寿命特性を改善することができる電極組立体及びそれを含む二次電池を提供することにする。   The present invention has been made in view of the above-described problems, and an object of the present invention is to form a structure of an electrode assembly by winding a plurality of stacked unit cells with a long sheet-like separation film, By forming a plurality of through-holes that facilitate the entry and exit of the electrolyte solution in the part of the separation film that surrounds the sides of the film, it is structurally stable against external impacts, prevents the phenomenon of electrode pressing, An electrode assembly capable of improving the wettability of the electrode assembly with respect to a liquid and ultimately improving the safety, performance, and life characteristics of the battery, and a secondary battery including the electrode assembly.

前記目的を達成すべく、本発明に係る電極組立体によれば、複数の積層型単位セルを長いシート状の分離フィルムで巻き取った構造からなり、前記分離フィルムのうち、電極組立体の側面を取り囲む分離フィルムの当該部位に電解液の出入りを容易にする複数の貫通孔が形成されていることを特徴とする。   In order to achieve the above object, according to the electrode assembly of the present invention, the electrode assembly has a structure in which a plurality of stacked unit cells are wound with a long sheet-like separation film, and the side surface of the electrode assembly among the separation films. A plurality of through-holes that facilitate the entry and exit of the electrolytic solution are formed in the portion of the separation film that surrounds the substrate.

これによると、所定単位の積層型単位セルが分離フィルムにより順次取り囲まれた状態で積層されており、電極の押され現象を根本的に防止し、このような分離フィルムに形成されている貫通孔を通じて電解液の含浸時、濡れ性を向上させることができるので、究極的に電池の優れた安全性、性能及び寿命特性を確保することができる。   According to this, the laminated unit cells of a predetermined unit are laminated in a state of being sequentially surrounded by the separation film, and the electrode pressing phenomenon is fundamentally prevented, and the through-hole formed in such a separation film Since the wettability can be improved at the time of impregnation with the electrolytic solution, the excellent safety, performance and life characteristics of the battery can be ensured.

本発明による電極組立体において、前記積層型単位セルは、正極と負極、及びその間に介在される分離膜からなるものであれば、特に制限されるものではなく、例えば、バイセルまたはフルセルであってもよい。   In the electrode assembly according to the present invention, the stacked unit cell is not particularly limited as long as it is composed of a positive electrode and a negative electrode, and a separation membrane interposed therebetween, and is, for example, a bicell or a full cell. Also good.

前記フルセルとは、両側にそれぞれ正極と負極が位置するセルであり、正極／分離膜／負極の構造からなる単位セルを意味する。例えば、前記フルセルは、最も基本的な構造の正極／分離膜／負極セルと正極／分離膜／負極／分離膜／正極／分離膜／負極セルなどが挙げられる。このようなフルセルを用いて、前記電極組立体を構成するためには、分離フィルムが介在された状態で、正極と負極が互いに対面するように、複数のフルセルを積層しなければならない。   The full cell is a cell in which a positive electrode and a negative electrode are located on both sides, and means a unit cell having a positive electrode / separation membrane / negative electrode structure. For example, the full cell includes a positive electrode / separation membrane / negative electrode cell and a positive electrode / separation membrane / negative electrode / separation membrane / positive electrode / separation membrane / negative electrode cell having the most basic structure. In order to configure the electrode assembly using such a full cell, a plurality of full cells must be laminated so that the positive electrode and the negative electrode face each other with the separation film interposed therebetween.

前記バイセルとは、両側にそれぞれ同一の電極が位置するセルであり、両側に正極が位置する構造からなる単位セルと、両側に負極が位置する構造からなる単位セルとを意味する。例えば、前記バイセルは、正極／分離膜／負極／分離膜／正極セル及び負極／分離膜／正極／分離膜／負極セルなどが挙げられる。このようなバイセルを用いて前記電極組立体を構成するためには、分離フィルムが介在された状態で、正極／分離膜／負極／分離膜／正極構造のバイセルと、負極／分離膜／正極／分離膜／負極構造のバイセルが互いに対面するように、複数のバイセルを積層しなければならない。   The bicell is a cell in which the same electrode is located on both sides, and means a unit cell having a structure in which a positive electrode is located on both sides and a unit cell having a structure in which a negative electrode is located on both sides. Examples of the bicell include positive electrode / separation membrane / negative electrode / separation membrane / positive electrode cell and negative electrode / separation membrane / positive electrode / separation membrane / negative electrode cell. In order to configure the electrode assembly using such a bicell, a bicell having a positive electrode / separation membrane / negative electrode / separation membrane / positive electrode structure and a negative electrode / separation membrane / positive electrode / A plurality of bicelles must be stacked so that the separation membrane / negative electrode structure bicelles face each other.

本発明における電極組立体の側面とは、電極組立体の上面と下面を除いた外周面のうち、電極タブが突出している前面と、それに対向する後面以外の両側面を意味する。このような側面は、単位セルを取り囲む形態で、分離フィルムを巻取（フォールド）する場合、分離フィルムにより単位セルが覆われる部位でもある。本発明によると、このような側面位置の分離フィルム上に貫通孔が形成されていることを特徴とする。分離フィルムの部位のうち、貫通孔が形成されている部位は、外側の側面部位のみならず、内側の側面部位を全て含む概念である。   The side surface of the electrode assembly in the present invention means a front surface from which the electrode tab protrudes and both side surfaces other than the rear surface opposite to the outer peripheral surface excluding the upper surface and the lower surface of the electrode assembly. Such a side surface is also a part where the unit cell is covered with the separation film when the separation film is wound (folded) in a form surrounding the unit cell. According to the present invention, a through hole is formed on the separation film at such a side surface position. The part in which the through-hole is formed among the parts of the separation film is a concept including not only the outer side part but also the inner side part.

場合に応じては、前記電極組立体の外面としての上面および／または下面を取り囲む分離フィルムの当該部位にも、さらに、複数の貫通孔が形成されてもよい。   According to circumstances, a plurality of through holes may be further formed in the portion of the separation film surrounding the upper surface and / or the lower surface as the outer surface of the electrode assembly.

一つの好ましい例において、分離フィルムの巻取の外端部は、それに接する分離フィルム上に接着部材を用いて付着されていても、または、熱融着により付着されていてもよい。前記接着部材は、例えば、接着剤、両面テープなどが挙げられる。このように、分離フィルムの巻取の外端部が究極的に電極組立体の外面に付着することにより、さらに安定的な構造の電極組立体が製造され得る。   In one preferable example, the outer end portion of the separation film may be attached to the separation film in contact with the separation film using an adhesive member or may be attached by heat fusion. Examples of the adhesive member include an adhesive and a double-sided tape. In this way, the outer end portion of the separation film is ultimately attached to the outer surface of the electrode assembly, whereby an electrode assembly having a more stable structure can be manufactured.

本発明において、前記貫通孔は、様々な直径に形成され得るが、好ましくは、５μｍ乃至１０ｍｍの直径を有し、さらに好ましくは、２０μｍ乃至１ｍｍの直径を有してもよい。前記貫通孔の直径が大き過ぎる場合は、隣接した貫通孔間において分離フィルムが破損する可能性が高く、これに対して、前記貫通孔の直径が小さ過ぎる場合は、電解液の通過が容易でなく、所望の濡れ性を示すことができないので、好ましくない。   In the present invention, the through hole may be formed in various diameters, but preferably has a diameter of 5 μm to 10 mm, and more preferably 20 μm to 1 mm. If the diameter of the through-hole is too large, the separation film is likely to break between adjacent through-holes. On the other hand, if the diameter of the through-hole is too small, the electrolyte can easily pass through. And the desired wettability cannot be exhibited, which is not preferable.

前記貫通孔は、様々な方法で形成されるが、例えば、貫通孔の直径に対応する大きさを有するパンチで分離フィルムを切り取って形成しても、所定の大きさの直径を有する針状体で分離フィルムを部分的に破断して形成してもよい。ここで、針状体を用いて貫通孔を形成する場合は、パンチを用いる場合よりも、貫通孔の直径が多少小さいことがあるので、貫通孔の数を増やして所望の濡れ性を具現することができる。   The through-hole is formed by various methods. For example, even if the separation film is cut out by a punch having a size corresponding to the diameter of the through-hole, a needle-like body having a predetermined diameter is formed. The separation film may be partially broken. Here, when the through-hole is formed using the needle-like body, the diameter of the through-hole may be slightly smaller than when the punch is used, so the desired wettability is realized by increasing the number of the through-holes. be able to.

前記貫通孔は、電極組立体の製造のための巻取のために、分離フィルム上に単位セルを位置させるとき、前記単位セル間の離隔幅に対応する位置上に複数個形成してもよい。これにより、巻取過程において、貫通孔が電極組立体の側面に位置することができ、前記離隔幅は、積層される単位セルの個数及び積層される構造に応じて異なる。また、前記貫通孔は、分離フィルムにおいて、各単位セルの側面に対応する部位に形成されているので、前記単位セルの側面に対応する形態に形成されていることが好ましく、例えば、前記単位セル間の離隔幅の間隔で、分離フィルムの長さ方向に垂直な一列または二列の形態に形成されてもよい。   A plurality of the through holes may be formed at positions corresponding to the separation width between the unit cells when the unit cells are positioned on the separation film for winding for manufacturing the electrode assembly. . Accordingly, in the winding process, the through hole can be positioned on the side surface of the electrode assembly, and the separation width varies depending on the number of unit cells to be stacked and the structure to be stacked. Further, since the through-hole is formed in a portion corresponding to the side surface of each unit cell in the separation film, it is preferably formed in a form corresponding to the side surface of the unit cell. For example, the unit cell It may be formed in the form of one row or two rows perpendicular to the length direction of the separation film at intervals of a separation width therebetween.

前記貫通孔は、分離フィルムで巻き取って電極組立体を製造するのに先立って、分離フィルム上に予め形成することができる。しかし、貫通孔の形成位置を電極組立体の側面に正確に特定可能に、分離フィルムによる巻取が完了した後、貫通孔を形成してもよい。   The through holes may be formed in advance on the separation film prior to winding the separation film and manufacturing the electrode assembly. However, the through hole may be formed after the winding with the separation film is completed so that the through hole formation position can be accurately specified on the side surface of the electrode assembly.

本発明はまた、前記電極組立体を含むものからなる二次電池を提供するが、前記二次電池は、電極組立体にリチウム含有電解液を含浸させて製造されるリチウム二次電池に好適に適用され得る。   The present invention also provides a secondary battery comprising the electrode assembly. The secondary battery is suitable for a lithium secondary battery manufactured by impregnating a lithium-containing electrolyte in the electrode assembly. Can be applied.

本発明によれば、外部衝撃時の構造的安定性と電解液に対する濡れ性に優れ、究極的に電池の安全性、性能及び寿命特性を改善することができる。   According to the present invention, the structural stability at the time of external impact and the wettability with respect to the electrolyte solution are excellent, and the safety, performance and life characteristics of the battery can be improved ultimately.

以下、本発明の好ましい実施の形態を、添付図面に基づき詳細に説明するが、本発明の範疇がこれらに限定されるものではない。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, but the scope of the present invention is not limited thereto.

図１は、本発明の一実施の形態に係る電極組立体を模式的に示す断面図である。   FIG. 1 is a cross-sectional view schematically showing an electrode assembly according to an embodiment of the present invention.

図１を参照すると、電極組立体１００は、複数のバイセル１１０、１２０、１３０…が、複数の貫通孔２１０、２２０、２３０…が形成されている一つの長い分離フィルム２００によりフォールドされている。   Referring to FIG. 1, in the electrode assembly 100, a plurality of bicells 110, 120, 130... Are folded by a single long separation film 200 in which a plurality of through holes 210, 220, 230.

電極組立体１００は、分離フィルム２００が中央の第１のバイセル１１０の外面を一回り取り囲み、第１のバイセル１１０の上部と下部にそれぞれ第２のバイセル１２０と第３のバイセル１３０を位置させた状態で、これらの外面を一回り取り囲む構造であり、バイセル１１０、１２０、１３０…をフォールドして製造され得る。したがって、分離フィルム２００の第１の貫通孔２１０は、第１のバイセル１１０の一側面に位置してもよく、第２の貫通孔２２０は、第１のバイセル１１０と第２のバイセル１２０との間の他側面に位置してもよく、第３の貫通孔２３０は、第１のバイセル１１０と第２のバイセル１２０との間の一側面に位置してもよい。このような構造として、分離フィルム２００の貫通孔２１０、２２０、２３０…が電極組立体１００の両側面に位置するように、分離フィルム２００の貫通孔２１０、２２０、２３０…は、バイセル１１０、１２０、１３０…の離隔幅で離隔されて形成されている。このような貫通孔２１０、２２０、２３０…の形成構造は、分離フィルム２００の平面図が模式的に示されている図２から容易に確認することができる。   In the electrode assembly 100, the separation film 200 encircles the outer surface of the central first bicell 110, and the second bicell 120 and the third bicell 130 are positioned at the upper and lower portions of the first bicell 110, respectively. In a state, it is a structure that surrounds these outer surfaces once, and can be manufactured by folding the bicells 110, 120, 130. Accordingly, the first through-hole 210 of the separation film 200 may be located on one side of the first bicell 110, and the second through-hole 220 is formed between the first bicell 110 and the second bicell 120. The third through hole 230 may be located on one side surface between the first bicell 110 and the second bicell 120. In such a structure, the through holes 210, 220, 230... Of the separation film 200 are formed by the bicells 110, 120 so that the through holes 210, 220, 230. , 130... Are separated from each other. The formation structure of such through-holes 210, 220, 230... Can be easily confirmed from FIG. 2 in which a plan view of the separation film 200 is schematically shown.

図２を参照すると、分離フィルム２００は、その長さ方向に所定の幅で離隔されている貫通孔２１０、２２０、２３０…を含んでいる。実質的に、それぞれの貫通孔２１０、２２０、２３０…は、図１に示すように一つの一体化した孔からなるものではなく、図２に示すように、一列で配列された複数の孔２１１、２２１、２３１…からなってもよい。したがって、それぞれの貫通孔２１０、２２０、２３０…は、電極組立体１００の側面で、それらの孔２１１、２２１、２３１…がバイセル１１０、１２０、１３０…の長さ方向に向けて一列で配列されている形態として、分離フィルム２００に形成されている。   Referring to FIG. 2, the separation film 200 includes through holes 210, 220, 230... Separated by a predetermined width in the length direction. Substantially, each of the through holes 210, 220, 230... Does not consist of a single integrated hole as shown in FIG. 1, but a plurality of holes 211 arranged in a row as shown in FIG. , 221, 231... Therefore, each of the through holes 210, 220, 230... Is arranged in a row in the side surface of the electrode assembly 100 and the holes 211, 221, 231. As a form, the separation film 200 is formed.

この際、分離フィルム２００において、第１の貫通孔２１０の離隔距離ｌ１は、第１のバイセル１１０の幅ｗ１と厚さｔ１の１／２を足した値であり、第１の貫通孔２１０と第２の貫通孔２２０の離隔距離ｌ２は、第１のバイセル１１０の幅ｗ１と厚さｔ１を足した値である。実質的に、第１のバイセル１１０の厚さｔ１は、極めて小さい値であるので、第１の貫通孔２１０及び第１の貫通孔２１０と第２の貫通孔２２０の離隔距離ｌ１、ｌ２は、第１のバイセル１１０の幅ｗ１と同じである。しかし、積層されるバイセルの個数が大きくなるほど、バイセルの厚さも増加するので、前記バイセルの厚さも考慮して、離隔距離を計算しなければならない。 At this time, in the separation film 200, the separation distance l 1 of the first through-hole 210 is a value obtained by adding 1/2 of the width w 1 and the thickness t 1 of the first bicell 110, and the first penetration The separation distance l 2 between the hole 210 and the second through hole 220 is a value obtained by adding the width w 1 and the thickness t 1 of the first bicell 110. Substantially, the thickness t 1 of the first bicell 110 is an extremely small value, so that the first through hole 210 and the separation distances l 1 and l between the first through hole 210 and the second through hole 220 are substantially the same. 2 is the same as the width w 1 of the first bicell 110. However, since the thickness of the bicell increases as the number of stacked bicells increases, the separation distance must be calculated in consideration of the thickness of the bicell.

図３は、本発明のまた他の実施の形態に係る電極組立体において、それをなす分離フィルムを模式的に示す平面図である。   FIG. 3 is a plan view schematically showing a separation film forming an electrode assembly according to still another embodiment of the present invention.

図３を参照すると、分離フィルム３００は、その長さに応じて所定の距離で離隔されている貫通孔３１０、３２０、３３０…を含んでおり、このような貫通孔３１０、３２０、３３０は、二列で配列された複数の孔３１１、３１２：３２１、３２２：３３１、３３２からなっている。   Referring to FIG. 3, the separation film 300 includes through holes 310, 320, 330... Separated by a predetermined distance according to the length thereof. It consists of a plurality of holes 311, 312: 321, 322: 331, 332 arranged in two rows.

以下、実施例を用いて本発明をさらに詳述するが、下記の実施例は、本発明を例示するためのものであり、本発明の範疇がこれらのみに限定されるものではない。   EXAMPLES Hereinafter, although this invention is explained in full detail using an Example, the following Example is for illustrating this invention, and the category of this invention is not limited only to these.

［実施例１］
正極活物質としてＬｉＣｏＯ２９５重量％、Ｓｕｐｅｒ−Ｐ（導電剤）２．５重量％、及びＰＶｄＦ（結合剤）２．５重量％を、溶剤であるＮＭＰ（Ｎ−ｍｅｔｈｙｌ−２−ｐｙｒｒｏｌｉｄｏｎｅ）に添加して、正極混合物スラリを製造し、負極活物質として人造黒鉛９５重量％、Ｓｕｐｅｒ−Ｐ（導電剤）２．５重量％、及びＰＶｄＦ（結合剤）２．５％を、溶剤であるＮＭＰに添加して、負極混合物スラリを製造した後、アルミ箔と銅箔上にそれぞれコート、乾燥及び圧着して、正極及び負極を製造した。 [Example 1]
As a positive electrode active material, 95% by weight of LiCoO 2, 2.5% by weight of Super-P (conductive agent), and 2.5% by weight of PVdF (binder) were added to NMP (N-methyl-2-pyrrolidone) as a solvent. To produce a positive electrode mixture slurry, and as a negative electrode active material, 95% by weight of artificial graphite, 2.5% by weight of Super-P (conductive agent), and 2.5% of PVdF (binder) are used as NMP as a solvent. To produce a negative electrode mixture slurry, and then coated, dried and pressed on an aluminum foil and a copper foil, respectively, to produce a positive electrode and a negative electrode.

分離膜としてセルガードＴＭを用い、前記正極と負極、及び前記分離膜を順に積層してバイセルを構成した後、前記分離膜と同一の素材であり、図２に示すような構造で複数の貫通孔が形成されている分離フィルムで、７個のバイセルを図１に示すように順次フォールドして電極組立体を製造し、前記電極組立体を電池ケースに内蔵した後、電解液を注入して電池を完成した。 A cell guard TM is used as a separation membrane, and the positive electrode, the negative electrode, and the separation membrane are sequentially laminated to form a bicell, and then the same material as the separation membrane, and a plurality of through-holes having a structure as shown in FIG. As shown in FIG. 1, an electrode assembly is manufactured by sequentially folding seven bicelles as shown in FIG. 1, and the electrode assembly is built in a battery case. Was completed.

［比較例１］
分離フィルムを用いることなく、分離膜が介在された状態で、正極と負極を順次積層したことを除いては、前記実施例１と同様にして、電池を完成した。 [Comparative Example 1]
A battery was completed in the same manner as in Example 1 except that the positive electrode and the negative electrode were sequentially laminated with the separation membrane interposed without using the separation film.

［比較例２］
貫通孔が形成されていない分離フィルムを用いたことを除いては、前記実施例１と同様にして、電池を完成した。 [Comparative Example 2]
A battery was completed in the same manner as in Example 1 except that a separation film having no through holes was used.

［実験例１］
前記実施例１と比較例１及び２の過程でそれぞれ製造された２０個の電池に対して、落下衝撃時の短絡発生の有無を確認し、また、実施例１と比較例２の電池において、電解液含浸液の含浸速度を測定した。短絡試験では、電池の側面隅が床に衝突するように、５０回連続落下させる方法により、短絡の有無を確認し、電解液含浸速度の測定は、電解液の注液後、時間別に分解して内部まで含浸されたときの時間を測定する方法で行った。 [Experimental Example 1]
For the 20 batteries manufactured in the process of Example 1 and Comparative Examples 1 and 2, the presence or absence of occurrence of a short circuit at the time of drop impact was confirmed. In the batteries of Example 1 and Comparative Example 2, The impregnation rate of the electrolytic solution was measured. In the short-circuit test, the presence or absence of a short-circuit is confirmed by a method of dropping 50 times continuously so that the side corners of the battery collide with the floor, and the electrolyte impregnation rate is measured after the injection of the electrolyte. And measuring the time when it was impregnated to the inside.

短絡試験の結果、実施例１と比較例２の電池は、全ての電池において短絡が引き起こされなかったのに対して、比較例１の電池のうち、４個の電池において短絡が発生した。これは、落下衝撃の際に、電極組立体の一部電極が押されながら、正極と負極の部分的な接触により短絡が引き起こされたからである。   As a result of the short circuit test, the batteries of Example 1 and Comparative Example 2 did not cause a short circuit in all of the batteries, but short circuits occurred in four of the batteries of Comparative Example 1. This is because a short circuit is caused by partial contact between the positive electrode and the negative electrode while a part of the electrode of the electrode assembly is pushed during the drop impact.

また、電解液の含浸結果、実施例１の電池は、比較例２の電池に比べて、電解液の含浸速度が３倍以上速いことが確認された。これは、電極組立体の側面に形成された複数の貫通孔から電解液が電極組立体の内部に容易に移動することができたからである。   In addition, as a result of the impregnation with the electrolytic solution, it was confirmed that the battery of Example 1 had an electrolytic solution impregnation rate three times faster than the battery of Comparative Example 2. This is because the electrolyte can easily move into the electrode assembly from the plurality of through holes formed in the side surface of the electrode assembly.

本発明の属する分野における通常の知識を有する者であれば、前記内容に基づいて本発明の範疇内で様々な応用及び変形を行うことが可能である。   A person having ordinary knowledge in the field to which the present invention belongs can make various applications and modifications within the scope of the present invention based on the above contents.

本発明の一実施の形態に係る電極組立体を示す断面図である。It is sectional drawing which shows the electrode assembly which concerns on one embodiment of this invention. 図１に示した電極組立体をなす分離フィルムを示す平面図である。It is a top view which shows the separation film which makes the electrode assembly shown in FIG. 本発明のまた他の実施の形態に係る電極組立体において、それをなす分離フィルムを示す平面図である。It is a top view which shows the separation film which makes it in the electrode assembly which concerns on other embodiment of this invention.

符号の説明Explanation of symbols

１００ 電極組立体
１１０、１２０、１３０ バイセル
２００、３００ 分離フィルム
２１０、２２０、２３０ 貫通孔
２１１、２２１、２３１ 孔
３１０、３２０、３３０ 貫通孔
３１１、３１２：３２１、３２２：３３１、３３２ 孔 100 Electrode assembly 110, 120, 130 Bicell 200, 300 Separation film 210, 220, 230 Through hole 211, 221, 231 hole 310, 320, 330 Through hole 311, 312: 321, 322: 331, 332 hole

Claims (11)

複数の積層型単位セルを長いシート状の分離フィルムで巻き取った構造を備えてなり、
前記分離フィルムのうち、電極組立体の側面を取り囲む分離フィルムが当該分離フィルムの部位に電解液の出入りを容易にする複数の貫通孔が形成されてなるものである、電極組立体。 It has a structure in which a plurality of laminated unit cells are wound up with a long sheet-like separation film,
An electrode assembly, wherein a separation film surrounding a side surface of the electrode assembly is formed with a plurality of through-holes for facilitating entry and exit of an electrolytic solution at a portion of the separation film. 前記電極組立体の外面における上面および／または下面を取り囲む分離フィルムの部位にも、複数の貫通孔がさらに形成されてなるものである、請求項１に記載の電極組立体。   The electrode assembly according to claim 1, wherein a plurality of through holes are further formed in a portion of the separation film surrounding the upper surface and / or the lower surface on the outer surface of the electrode assembly. 前記積層型単位セルが、バイセルまたはフルセルである、請求項１に記載の電極組立体。   The electrode assembly according to claim 1, wherein the stacked unit cell is a bicell or a full cell. 前記分離フィルムの巻取の外端部が、それに接する分離フィルム上に接着部材を用いて付着され、又は、熱融着により付着されてなる、請求項１に記載の電極組立体。   The electrode assembly according to claim 1, wherein an outer end portion of the winding of the separation film is attached on the separation film in contact with the separation film using an adhesive member or is attached by heat fusion. 前記貫通孔が５μｍ乃至１０ｍｍの直径を有するものである、請求項１に記載の電極組立体。   The electrode assembly according to claim 1, wherein the through hole has a diameter of 5 μm to 10 mm. 前記貫通孔が２０μｍ乃至１ｍｍの直径を有するものである、請求項５に記載の電極組立体。   The electrode assembly according to claim 5, wherein the through hole has a diameter of 20 μm to 1 mm. 前記貫通孔が、その直径に対応する大きさを有するパンチで分離フィルムを切り取って形成されてなるものである、請求項１に記載の電極組立体。   The electrode assembly according to claim 1, wherein the through hole is formed by cutting a separation film with a punch having a size corresponding to the diameter of the through hole. 前記貫通孔が、所定の大きさの直径を有する針状体で分離フィルムを部分的に破断して形成されてなるものである、請求項１に記載の電極組立体。   The electrode assembly according to claim 1, wherein the through-hole is formed by partially breaking a separation film with a needle-like body having a diameter of a predetermined size. 前記貫通孔が、電極組立体の製造のための巻取のために、分離フィルム上に単位セルを位置させる際、前記単位セル間の離隔幅に対応する位置上に複数個形成されてなる、請求項１に記載の電極組立体。   When the unit cell is positioned on the separation film for winding for manufacturing the electrode assembly, a plurality of the through holes are formed at positions corresponding to the separation width between the unit cells. The electrode assembly according to claim 1. 請求項１〜９のいずれか一項に記載の電極組立体を含んでなる、二次電池。   A secondary battery comprising the electrode assembly according to claim 1. 前記二次電池が、電極組立体にリチウム含有電解液を含浸させて製造されてなるものである、請求項１０に記載の二次電池。   The secondary battery according to claim 10, wherein the secondary battery is manufactured by impregnating an electrode assembly with a lithium-containing electrolyte.
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