JP6563008B2 - Secondary battery - Google Patents

Secondary battery Download PDF

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JP6563008B2
JP6563008B2 JP2017515450A JP2017515450A JP6563008B2 JP 6563008 B2 JP6563008 B2 JP 6563008B2 JP 2017515450 A JP2017515450 A JP 2017515450A JP 2017515450 A JP2017515450 A JP 2017515450A JP 6563008 B2 JP6563008 B2 JP 6563008B2
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secondary battery
separator
separators
electrode
wound
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JPWO2016174991A1 (en
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伸芳 田中
伸芳 田中
有島　康夫
康夫 有島
稔之 有賀
稔之 有賀
飯塚　佳士
佳士 飯塚
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Hitachi Astemo Ltd
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Hitachi Automotive Systems 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound 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

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  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)

Description

本発明は、捲回電極群を備える二次電池に関する。   The present invention relates to a secondary battery including a wound electrode group.

例えば、ハイブリッド電気自動車や純粋な電気自動車等の動力源として大容量（Ｗｈ）の二次電池が開発されており、特に、エネルギー密度（Ｗｈ／ｋｇ）の高い角形のリチウムイオン二次電池が注目されている。このような二次電池は、例えば、正極板と負極板とをセパレータを介在させて捲回した電極群を電解液とともに電池外装体に封入することによって構成されている（例えば、下記特許文献１を参照）。   For example, secondary batteries with large capacity (Wh) have been developed as power sources for hybrid electric vehicles and pure electric vehicles, and in particular, prismatic lithium ion secondary batteries with high energy density (Wh / kg) are of interest. Has been. Such a secondary battery is configured, for example, by enclosing an electrode group, in which a positive electrode plate and a negative electrode plate are wound with a separator interposed therebetween, together with an electrolytic solution in a battery outer package (for example, Patent Document 1 below). See).

特許文献１には、非水二次電池が内部短絡する要因の一つとして、電極群を渦巻き状に捲回する際、電極板とセパレータの位置関係にズレが生じ、電極板が露出することが記載されている。また、特許文献１には、電極板とセパレータを重ねて巻芯に巻きつけることで渦巻き状に捲回した後、巻芯から抜く際、巻芯とセパレータの接触部分において摩擦が大きいために接触部のみが巻芯に残ること、そのため、その付近の電極板がセパレータで覆われなかったり、電極群の中心部分が捲回体からはみ出したりする現象が起こり、電極群として体を成さなくなること等が記載されている。   In Patent Document 1, as one of the causes of the internal short circuit of the nonaqueous secondary battery, when the electrode group is wound in a spiral shape, the positional relationship between the electrode plate and the separator is shifted, and the electrode plate is exposed. Is described. In Patent Document 1, the electrode plate and the separator are overlapped and wound around the core, and then wound in a spiral shape. Only the part remains in the core, and therefore, the electrode plate in the vicinity thereof is not covered with the separator, or the central part of the electrode group protrudes from the wound body, and the body does not form the electrode group Etc. are described.

特許文献１は、前記課題を解決するための手段として、表面の摩擦係数の異なる正極板と負極板とを備え、前記正極板と前記負極板を両面で摩擦係数の異なるセパレータを介して捲回してなる電池用の電極群であって、前記セパレータの摩擦係数の大きい面を正極板と負極板のうち表面の摩擦係数の大きい方と接するように捲回して構成したことを特徴とする電池用電極群を開示している。特許文献１には、前記構成により、電極群の製作時のセパレータのズレによる電極板の露出を抑制し、偏平形状に成形する際の合剤層の脱落を抑制することで、電極群の内部短絡を抑制することが可能である、と記載されている。   Patent Document 1 includes a positive electrode plate and a negative electrode plate having different surface friction coefficients as means for solving the above problems, and the positive electrode plate and the negative electrode plate are wound through separators having different friction coefficients on both sides. A battery electrode group comprising: a separator having a large friction coefficient surface wound so as to contact a positive electrode plate and a negative electrode plate having a larger surface friction coefficient. An electrode group is disclosed. According to Patent Document 1, the above configuration suppresses the electrode plate from being exposed due to the displacement of the separator during the production of the electrode group, and suppresses the dropping of the mixture layer when the electrode group is formed into a flat shape. It is described that it is possible to suppress a short circuit.

特開２０１３−８９４４１号公報JP 2013-89441 A

特許文献１の図６及び図９を参照すると、特許文献１の電池用電極群は、最内周にセパレータのみが捲回された部分を有している。この部分には、正極板も負極板も存在しないため、セパレータの摩擦係数の大きい面と、正極板と負極板のうち表面の摩擦係数の大きい方との接触による摩擦力を得ることができない。したがって、特許文献１の電池用電極群は、例えば、巻芯から電極群を抜く際に、最内周のセパレータのみが捲回された部分においてセパレータのズレを防止することができない。   6 and 9 of Patent Document 1, the battery electrode group of Patent Document 1 has a portion in which only the separator is wound on the innermost periphery. Since there is neither a positive electrode plate nor a negative electrode plate in this portion, it is impossible to obtain a frictional force due to contact between the separator having a large friction coefficient and the positive electrode plate and the negative electrode plate having the larger surface friction coefficient. Therefore, the battery electrode group of Patent Literature 1 cannot prevent the separator from being displaced at a portion where only the innermost separator is wound when the electrode group is pulled out from the core, for example.

本発明は、前記課題に鑑みてなされたものであり、捲回電極群の最内周のセパレータのズレを防止することができる二次電池を提供することを目的とする。   This invention is made | formed in view of the said subject, and it aims at providing the secondary battery which can prevent the shift | offset | difference of the innermost separator of a winding electrode group.

前記目的を達成すべく、本発明の二次電池は、セパレータを介在させて電極を捲回した捲回電極群を備えた二次電池であって、前記電極の捲回方向における始端部よりも内周に捲回された前記セパレータの少なくとも一部を固定する固定部を備えることを特徴とする。   In order to achieve the object, the secondary battery of the present invention is a secondary battery including a wound electrode group in which an electrode is wound with a separator interposed therebetween, and is more than a starting end portion in the winding direction of the electrode. A fixing portion for fixing at least a part of the separator wound around the inner periphery is provided.

本発明の二次電池によれば、電極の捲回方向における始端部よりも内周に捲回されたセパレータの少なくとも一部を固定する固定部を備えることによって、捲回電極群のセパレータのズレを防止することができる。   According to the secondary battery of the present invention, the separator of the wound electrode group is displaced by including the fixing portion that fixes at least a part of the separator wound on the inner periphery from the start end in the winding direction of the electrode. Can be prevented.

本発明の実施形態１に係る二次電池の外観斜視図。1 is an external perspective view of a secondary battery according to Embodiment 1 of the present invention. 図１に示す二次電池の分解斜視図。The disassembled perspective view of the secondary battery shown in FIG. 図２に示す二次電池の捲回電極群の分解斜視図。The disassembled perspective view of the winding electrode group of the secondary battery shown in FIG. 図３に示すIV-IV線に沿う捲回電極群の拡大断面図。The expanded sectional view of the wound electrode group which follows the IV-IV line shown in FIG. 図４に示す捲回電極群が巻芯に捲回された状態を示す拡大断面図。The expanded sectional view which shows the state by which the wound electrode group shown in FIG. 4 was wound by the winding core. 図２に示すVI-VI線に沿う捲回電極群の拡大断面図。The expanded sectional view of the wound electrode group which follows the VI-VI line shown in FIG. 実施形態１に係る固定部の変形例１を示す図６に相当する拡大断面図。FIG. 7 is an enlarged cross-sectional view corresponding to FIG. 6 and showing a first modification of the fixing portion according to the first embodiment. 実施形態１に係る固定部の変形例２を示す図６に相当する拡大断面図。FIG. 7 is an enlarged cross-sectional view corresponding to FIG. 6 and showing a second modification of the fixing portion according to the first embodiment. 実施形態１に係る固定部の変形例３を示す図４に相当する拡大断面図。FIG. 6 is an enlarged cross-sectional view corresponding to FIG. 4 and showing a third modification of the fixing portion according to the first embodiment. 本発明の実施形態２に係る二次電池の図４に相当する捲回電極群の拡大断面図。The expanded sectional view of the winding electrode group corresponded in FIG. 4 of the secondary battery which concerns on Embodiment 2 of this invention. 図１０に示す捲回電極群の固定部の変形例１を示す拡大断面図。The expanded sectional view which shows the modification 1 of the fixing | fixed part of the winding electrode group shown in FIG. 図１０に示す捲回電極群の固定部の変形例２を示す拡大断面図。The expanded sectional view which shows the modification 2 of the fixing | fixed part of the winding electrode group shown in FIG.

以下、図面を参照して本発明の二次電池の実施の形態について説明する。   Embodiments of a secondary battery of the present invention will be described below with reference to the drawings.

［実施形態１］
まず、本発明の二次電池の実施形態１について説明する。図１は、本発明の実施形態１に係る二次電池１００の外観斜視図である。図２は、図１に示す二次電池１００の分解斜視図である。[Embodiment 1]
First, Embodiment 1 of the secondary battery of the present invention will be described. FIG. 1 is an external perspective view of a secondary battery 100 according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the secondary battery 100 shown in FIG.

本実施形態の二次電池１００は、例えば、ハイブリッド電気自動車や純粋な電気自動車等の動力源として用いられる大容量でエネルギー密度の高い角形のリチウムイオン二次電池である。詳細は後述するが、本実施形態の二次電池１００は、捲回電極群３０の負極電極３２の捲回の始端部３２Ｂよりも内周に捲回されたセパレータ３３，３４の少なくとも一部を固定する固定部５０（図４参照）を備えることを最大の特徴としている。   The secondary battery 100 of the present embodiment is a prismatic lithium ion secondary battery having a large capacity and high energy density, which is used as a power source for, for example, a hybrid electric vehicle or a pure electric vehicle. Although details will be described later, the secondary battery 100 according to the present embodiment includes at least a part of the separators 33 and 34 wound around the inner periphery of the winding start end 32B of the negative electrode 32 of the wound electrode group 30. The greatest feature is that a fixing portion 50 (see FIG. 4) for fixing is provided.

本実施形態の二次電池１００は、主に、偏平角形の電池容器１０と、該電池容器１０の外部に設けられた正極外部端子２０Ａ及び負極外部端子２０Ｂと、該電池容器１０に収容された捲回電極群３０と、該捲回電極群３０を正極外部端子２０Ａ及び負極外部端子２０Ｂに接続する正極集電板４０Ａ及び負極集電板４０Ｂとを有している。正極外部端子２０Ａ及び負極外部端子２０Ｂ、捲回電極群３０、並びに正極集電板４０Ａ及び負極集電板４０Ｂは、ガスケット１、絶縁板２、及び絶縁保護フィルム３によって、電池容器１０に対して電気的に絶縁されている。   The secondary battery 100 of the present embodiment is mainly accommodated in a flat rectangular battery container 10, a positive electrode external terminal 20 </ b> A and a negative electrode external terminal 20 </ b> B provided outside the battery container 10, and the battery container 10. The wound electrode group 30 includes a positive electrode current collector plate 40A and a negative electrode current collector plate 40B that connect the wound electrode group 30 to the positive electrode external terminal 20A and the negative electrode external terminal 20B. The positive electrode external terminal 20A and the negative electrode external terminal 20B, the wound electrode group 30, and the positive electrode current collector plate 40A and the negative electrode current collector plate 40B are attached to the battery container 10 by the gasket 1, the insulating plate 2, and the insulating protective film 3. It is electrically insulated.

電池容器１０、正極外部端子２０Ａ及び正極集電板４０Ａは、例えば、アルミニウム合金によって製作することができる。また、負極外部端子２０Ｂ及び負極集電板４０Ｂは、例えば、銅合金によって製作することができる。また、ガスケット１及び絶縁板２は、例えば、ポリブチレンテレフタレートやポリフェニレンサルファイド、ペルフルオロアルコキシフッ素樹脂等の絶縁性を有する樹脂材料によって製作することができる。絶縁保護フィルム３は、例えばＰＰ（ポリプロピレン）などの合成樹脂製の一枚のシートまたは複数のフィルム部材によって製作することができる。   The battery container 10, the positive electrode external terminal 20A, and the positive electrode current collector plate 40A can be made of, for example, an aluminum alloy. Moreover, the negative electrode external terminal 20B and the negative electrode current collector plate 40B can be made of, for example, a copper alloy. In addition, the gasket 1 and the insulating plate 2 can be made of an insulating resin material such as polybutylene terephthalate, polyphenylene sulfide, or perfluoroalkoxy fluororesin. The insulating protective film 3 can be manufactured by a sheet of a synthetic resin such as PP (polypropylene) or a plurality of film members.

本実施形態の二次電池１００は、正極側と負極側、例えば、正極外部端子２０Ａと負極外部端子２０Ｂ、及び、正極集電板４０Ａと負極集電板４０Ｂが、二次電池１００の幅方向Ｗにおける中心線に概ね対照な構成を有している。したがって、以下では、正極側と負極側において共通する構成については、正極外部端子２０Ａ及び負極外部端子２０Ｂを一括して外部端子２０と表記し、正極集電板４０Ａ及び負極集電板４０Ｂを一括して集電板４０と表記して説明する。   In the secondary battery 100 of the present embodiment, the positive electrode side and the negative electrode side, for example, the positive electrode external terminal 20A and the negative electrode external terminal 20B, and the positive electrode current collector plate 40A and the negative electrode current collector plate 40B are arranged in the width direction of the secondary battery 100. It has a configuration that is generally in contrast to the centerline at W. Therefore, in the following, regarding the configuration common to the positive electrode side and the negative electrode side, the positive electrode external terminal 20A and the negative electrode external terminal 20B are collectively referred to as the external terminal 20, and the positive electrode current collector plate 40A and the negative electrode current collector plate 40B are collectively illustrated. The current collector plate 40 will be described.

電池容器１０は、上部に開口部１１ａを有する偏平な有底角筒状の電池缶１１と、該電池缶１１の開口部１１ａを封止する矩形平板状の電池蓋１２とを有している。電池缶１１は、概ね長方形の底面１１ｂと、該底面１１ｂから垂直に立ち上がる概ね矩形の広側面１１ｃ及び狭側面１１ｄを有し、上部が開放されて概ね長方形の開口部１１ａを有している。電池缶１１は、内部に捲回電極群３０を収容した状態で、電池蓋１２が開口部１１ａを塞ぐように溶接されて封止される。   The battery container 10 includes a flat bottomed rectangular tube-shaped battery can 11 having an opening 11 a at the top, and a rectangular flat battery cover 12 that seals the opening 11 a of the battery can 11. . The battery can 11 has a generally rectangular bottom surface 11b, a generally rectangular wide side surface 11c and a narrow side surface 11d rising vertically from the bottom surface 11b, and an upper portion is opened to have a generally rectangular opening 11a. The battery can 11 is welded and sealed so that the battery lid 12 closes the opening 11a in a state where the wound electrode group 30 is accommodated therein.

電池蓋１２は、二次電池１００の幅方向Ｗを長手方向とする概ね長方形の上面１２ａを有している。電池蓋１２の上面１２ａの長手方向の一端と他端には、正極外部端子２０Ａと負極外部端子２０Ｂが設けられている。電池蓋１２は、上面１２ａの長手方向の一端と他端に、それぞれ外部端子２０の柱状の接続部２２を挿通させる貫通孔１２ｂを有し、ガスケット１及び絶縁板２によって外部端子２０及び集電板４０に対して電気的に絶縁されている。   The battery lid 12 has a substantially rectangular upper surface 12a with the width direction W of the secondary battery 100 as the longitudinal direction. A positive electrode external terminal 20A and a negative electrode external terminal 20B are provided at one end and the other end of the upper surface 12a of the battery lid 12 in the longitudinal direction. The battery lid 12 has through holes 12b through which the columnar connecting portions 22 of the external terminals 20 are inserted at one end and the other end in the longitudinal direction of the upper surface 12a, respectively. It is electrically insulated from the plate 40.

電池蓋１２の長手方向の中間部には、ガス排出弁１３と注液口１４が設けられている。ガス排出弁１３は、例えば、電池蓋１２を薄肉化することによって電池蓋１２と一体的に設けられ、電池容器１０の内部圧力が所定の値を超えて上昇したときに開裂してガスを排出し、電池容器１０の内部圧力を低下させて二次電池１００の安全性を確保する。注液口１４は、電池容器１０内に電解液を注入するのに用いられ、電解液の注入後に、注液栓１５が、例えばレーザ溶接によって溶接されて封止される。電池容器１０内に注入する電解液としては、例えば、エチレンカーボネート等の炭酸エステル系の有機溶媒に６フッ化リン酸リチウム（ＬｉＰＦ６）等のリチウム塩が溶解された非水電解液を適用することができる。A gas discharge valve 13 and a liquid injection port 14 are provided at an intermediate portion in the longitudinal direction of the battery lid 12. The gas discharge valve 13 is provided integrally with the battery cover 12 by thinning the battery cover 12, for example, and is cleaved and discharges gas when the internal pressure of the battery container 10 exceeds a predetermined value. Then, the internal pressure of the battery container 10 is reduced to ensure the safety of the secondary battery 100. The liquid injection port 14 is used to inject an electrolytic solution into the battery container 10, and after the injection of the electrolytic solution, the liquid injection plug 15 is welded and sealed, for example, by laser welding. As the electrolytic solution to be injected into the battery container 10, for example, a nonaqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonic acid ester-based organic solvent such as ethylene carbonate is applied. be able to.

外部端子２０は、バスバー等に溶接接合される溶接接合部２１と、集電板４０に接続される接続部２２とを有している。溶接接合部２１は、電池蓋１２の外側に配置される直方体のブロック形状を有し、下面が電池蓋１２の上面に対向し、上面が所定高さ位置で電池蓋１２の上面と平行になる構成を有している。接続部２２は、溶接接合部２１の下面から電池蓋１２を貫通する方向に突出し、電池蓋１２の円形の貫通孔１２ｂに挿通可能な円柱形状を有している。   The external terminal 20 has a weld joint 21 that is welded to a bus bar or the like, and a connection 22 that is connected to the current collector plate 40. The weld joint 21 has a rectangular parallelepiped block shape arranged outside the battery lid 12, the lower surface faces the upper surface of the battery lid 12, and the upper surface is parallel to the upper surface of the battery lid 12 at a predetermined height position. It has a configuration. The connection portion 22 protrudes from the lower surface of the weld joint portion 21 in a direction penetrating the battery lid 12 and has a cylindrical shape that can be inserted into the circular through hole 12 b of the battery lid 12.

集電板４０は、電池蓋１２の下面に対向して配置される矩形板状の基部４１と、基部４１の側端で折曲されて電池缶１１の広側面１１ｃに沿って底面に向かう方向に延びる接続端部４２を有している。集電板４０の基部４１は、外部端子２０の接続部２２を挿通させる貫通孔４３を有している。集電板４０の接続端部４２は、捲回電極群３０の捲回軸方向の両端部の箔露出部３１ｃ，３２ｃに対向して重ね合わされた状態で例えば超音波圧接や抵抗溶接等によって箔露出部３１ｃ，３２ｃに接合され、捲回電極群３０を構成する正極電極３１、負極電極３２（図３参照）と電気的に接続される。   The current collector plate 40 is a rectangular plate-like base portion 41 disposed to face the lower surface of the battery lid 12, and is bent at a side end of the base portion 41 and is directed toward the bottom surface along the wide side surface 11 c of the battery can 11. A connecting end 42 extending in the direction. The base portion 41 of the current collector plate 40 has a through hole 43 through which the connection portion 22 of the external terminal 20 is inserted. The connection end portion 42 of the current collector plate 40 is overlapped with the foil exposed portions 31c and 32c at both ends in the winding axis direction of the wound electrode group 30 so as to overlap with each other, for example, by ultrasonic welding or resistance welding. It is joined to the exposed portions 31c and 32c and is electrically connected to the positive electrode 31 and the negative electrode 32 (see FIG. 3) constituting the wound electrode group 30.

外部端子２０の接続部２２は、ガスケット１の貫通孔１ａ、電池蓋１２の貫通孔１２ｂ、絶縁板２の貫通孔２ａ、及び集電板４０の基部４１の貫通孔４３に順次挿通され、集電板４０の基部４１の下面すなわち電池蓋１２と反対側の面に突出した先端が拡径するようにかしめられる。これにより、外部端子２０及び集電板４０がガスケット１及び絶縁板２を介して電池蓋１２に一体に固定され、捲回電極群３０が集電板４０及び絶縁板２を介して電池蓋１２に固定される。また、外部端子２０が集電板４０を介して捲回電極群３０を構成する正極電極３１、負極電極３２（図３参照）と電気的に接続される。   The connection portion 22 of the external terminal 20 is sequentially inserted into the through hole 1a of the gasket 1, the through hole 12b of the battery cover 12, the through hole 2a of the insulating plate 2, and the through hole 43 of the base 41 of the current collector plate 40. It crimps so that the front-end | tip which protruded in the lower surface of the base 41 of the electric board 40, ie, the surface on the opposite side to the battery cover 12, may expand. Accordingly, the external terminal 20 and the current collector plate 40 are integrally fixed to the battery lid 12 via the gasket 1 and the insulating plate 2, and the wound electrode group 30 is connected to the battery lid 12 via the current collector plate 40 and the insulating plate 2. Fixed to. Further, the external terminal 20 is electrically connected to the positive electrode 31 and the negative electrode 32 (see FIG. 3) constituting the wound electrode group 30 via the current collector plate 40.

捲回電極群３０は、集電板４０及び絶縁板２を介して電池蓋１２に固定された状態で絶縁保護フィルム３によって覆われ、電池缶１１の開口部１１ａから電池缶１１内に挿入され、電池蓋１２の全周が電池缶１１の開口部１１ａの全周に亘って、例えばレーザ溶接によって接合されて、電池容器１０内に封入される。その後、電池蓋１２の注液口１４を介して電池容器１０内に電解液を注入し、注液口１４に注液栓１５を、例えばレーザ溶接によって接合し、電池容器１０を密閉する。   The wound electrode group 30 is covered with the insulating protective film 3 while being fixed to the battery lid 12 via the current collector plate 40 and the insulating plate 2, and is inserted into the battery can 11 from the opening 11 a of the battery can 11. The entire circumference of the battery lid 12 is joined to the entire circumference of the opening 11 a of the battery can 11 by, for example, laser welding, and enclosed in the battery container 10. Thereafter, an electrolytic solution is injected into the battery container 10 through the liquid injection port 14 of the battery lid 12, and a liquid injection plug 15 is joined to the liquid injection port 14 by, for example, laser welding to seal the battery container 10.

図３は、図２に示す二次電池１００の捲回電極群３０の分解斜視図である。図４は、図３に示すIV-IV線に沿う捲回電極群３０の最内周部分の拡大断面図である。図５は、図４に示す捲回電極群３０が巻芯６０に捲回された状態を示す拡大断面図である。図６は、図２に示すVI-VI線に沿う捲回電極群３０の拡大断面図である。なお、図４及び図６は、図５に示す巻芯６０が抜き取られた状態を示している。   FIG. 3 is an exploded perspective view of the wound electrode group 30 of the secondary battery 100 shown in FIG. FIG. 4 is an enlarged cross-sectional view of the innermost peripheral portion of the wound electrode group 30 along the line IV-IV shown in FIG. FIG. 5 is an enlarged cross-sectional view showing a state where the wound electrode group 30 shown in FIG. 4 is wound around the core 60. FIG. 6 is an enlarged cross-sectional view of the wound electrode group 30 along the line VI-VI shown in FIG. 4 and 6 show a state where the core 60 shown in FIG. 5 is removed.

捲回電極群３０は、最内周に捲回されたセパレータ３３，３４の周りに、該セパレータ３３，３４を介在させて正極電極３１及び負極電極３２を捲回することによって構成される。セパレータ３３，３４は、正極電極３１と負極電極３２との間を絶縁する役割を有している。   The wound electrode group 30 is configured by winding the positive electrode 31 and the negative electrode 32 around the separators 33 and 34 wound on the innermost periphery with the separators 33 and 34 interposed therebetween. The separators 33 and 34 have a role of insulating between the positive electrode 31 and the negative electrode 32.

図４から図６に示すように、セパレータ３３，３４は、正極電極３１及び負極電極３２よりも先に巻芯６０の周りに捲回され、捲回電極群３０の最内周にセパレータ３３，３４が一周以上に亘って捲回される。したがって、本実施形態の二次電池１００において、捲回電極群３０の最内周に捲回されたセパレータ３３，３４とは、広義には、最内周の負極電極３２の捲回方向Ｒの始端部３２Ｂよりも内周側に捲回されたセパレータ３３，３４を意味する。本実施形態では、この広義の最内周のセパレータ３３，３４を、セパレータ３３，３４の先捲部３５という。   As shown in FIGS. 4 to 6, the separators 33, 34 are wound around the core 60 before the positive electrode 31 and the negative electrode 32, and the separators 33, 34 are disposed on the innermost periphery of the wound electrode group 30. 34 is wound over more than one turn. Therefore, in the secondary battery 100 of the present embodiment, the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30 are broadly defined in the winding direction R of the innermost negative electrode 32. The separators 33 and 34 wound around the inner peripheral side from the start end portion 32B are meant. In the present embodiment, the innermost separators 33 and 34 in the broad sense are referred to as leading edge portions 35 of the separators 33 and 34.

セパレータ３３，３４の先捲部３５のうち、巻芯６０の周りに捲回される際に、巻芯６０の外表面に対向する最も内側のセパレータ３３の始端部３３Ｂから捲回方向Ｒに一周するまでの部分が、狭義の最内周に捲回されたセパレータ３３である。この狭義の最内周に捲回されたセパレータ３３を、セパレータ３３の最内周部３３Ａという。セパレータ３３の最内周部３３Ａは、捲回電極群３０から巻芯６０が抜き取られた後は、捲回電極群３０の中心部に形成される中空部３０ｃに面している。   Of the leading edge portions 35 of the separators 33, 34, when wound around the core 60, one turn in the winding direction R from the start end portion 33 </ b> B of the innermost separator 33 facing the outer surface of the core 60. The part up to this is the separator 33 wound around the innermost circumference in a narrow sense. The separator 33 wound around the innermost periphery in the narrow sense is referred to as an innermost peripheral portion 33 </ b> A of the separator 33. The innermost peripheral portion 33 </ b> A of the separator 33 faces the hollow portion 30 c formed at the center of the wound electrode group 30 after the winding core 60 is extracted from the wound electrode group 30.

前記したように、本実施形態の二次電池１００は、捲回電極群３０の負極電極３２の捲回方向Ｒにおける始端部３２Ｂよりも内周に捲回されたセパレータ３３，３４の少なくとも一部を固定する固定部５０を備えることを最大の特徴としている。また、本実施形態の二次電池１００において、固定部５０は、セパレータ３３の最内周部３３Ａをその外周側のセパレータ３４に固定し、さらにそのセパレータ３４をその外周側の負極電極３２又はセパレータ３３に固定している。すなわち、固定部５０は、セパレータ３３，３４の先捲部３５において、内周側のセパレータ３３を外周側のセパレータ３４に固定している。また、固定部５０は、負極電極３２に固定され、セパレータ３３，３４の先捲部３５を負極電極３２に固定している。   As described above, the secondary battery 100 of the present embodiment includes at least a part of the separators 33 and 34 wound around the inner periphery of the start end 32B in the winding direction R of the negative electrode 32 of the wound electrode group 30. The most characteristic feature is that a fixing portion 50 for fixing is provided. Further, in the secondary battery 100 of the present embodiment, the fixing portion 50 fixes the innermost peripheral portion 33A of the separator 33 to the separator 34 on the outer peripheral side, and the separator 34 is further connected to the negative electrode 32 or separator on the outer peripheral side. 33 is fixed. That is, the fixing portion 50 fixes the inner circumferential side separator 33 to the outer circumferential side separator 34 at the leading edge portion 35 of the separators 33 and 34. The fixing unit 50 is fixed to the negative electrode 32, and the leading end portion 35 of the separators 33 and 34 is fixed to the negative electrode 32.

固定部５０の材質は、セパレータ３３，３４を正極電極３１及び負極電極３２の少なくとも一方に固定できるものであれば特に限定されないが、例えば、粘着剤、接着剤、又は、正極電極３１及び負極電極３２に用いられる結着材と同様の材料を用いることができる。粘着剤としては、特に、アクリル系粘着剤が好ましい。これらの材料を、例えば、セパレータ３３，３４の表裏面の少なくとも一方に塗布又は配置した状態で、セパレータ３３，３４を捲回することで、固定部５０を形成することができる。また、セパレータ３３，３４の少なくとも一部を溶融及び固化させた熱溶着部を固定部５０としてもよい。   The material of the fixing part 50 is not particularly limited as long as the separators 33 and 34 can be fixed to at least one of the positive electrode 31 and the negative electrode 32. For example, an adhesive, an adhesive, or the positive electrode 31 and the negative electrode are used. The same material as the binder used for 32 can be used. As the adhesive, an acrylic adhesive is particularly preferable. For example, the fixed portion 50 can be formed by winding the separators 33 and 34 in a state where these materials are applied or arranged on at least one of the front and back surfaces of the separators 33 and 34. Further, a heat welding part in which at least a part of the separators 33 and 34 is melted and solidified may be used as the fixing part 50.

本実施形態の二次電池１００において、固定部５０は、セパレータ３３の最内周部３３Ａを含むセパレータ３３，３４の先捲部３５において、セパレータ３３，３４間に設けられ、セパレータ３３，３４を相互に固定している。また、固定部５０は、セパレータ３３，３４の先捲部３５のうち、最も外側に捲回されたセパレータ３４と負極電極３２との間に設けられ、セパレータ３３の最内周部３３Ａを含むセパレータ３３，３４の先捲部３５を負極電極３２に固定している。   In the secondary battery 100 of the present embodiment, the fixing portion 50 is provided between the separators 33 and 34 in the leading end portion 35 of the separators 33 and 34 including the innermost peripheral portion 33A of the separator 33. They are fixed to each other. The fixed portion 50 is provided between the separator 34 wound on the outermost side of the leading edge portions 35 of the separators 33, 34 and the negative electrode 32, and includes the innermost peripheral portion 33 </ b> A of the separator 33. The leading end portions 35 of 33 and 34 are fixed to the negative electrode 32.

すなわち、本実施形態の二次電池１００は、捲回電極群３０のセパレータ３３の最内周部３３Ａが、複数の固定部５０と先捲部３５のセパレータ３３，３４とを介して、負極電極３２の最内周部３２Ａに固定されている。ここで、負極電極３２の最内周部３２Ａとは、負極電極３２の捲回の始端部３２Ｂから捲回方向Ｒに巻芯６０又は中空部３０ｃを一周するまでの部分を意味する。より詳細には、固定部５０は、負極電極３２の最内周部３２Ａの負極合剤層３２ｂに対してセパレータ３３，３４の先捲部３５を固定している。また、複数の固定部５０は、セパレータ３３，３４の積層方向、すなわちセパレータ３３，３４の厚さ方向に互いに重なる位置に設けられている。   That is, in the secondary battery 100 of the present embodiment, the innermost peripheral portion 33A of the separator 33 of the wound electrode group 30 is connected to the negative electrode through the plurality of fixing portions 50 and the separators 33 and 34 of the leading end portion 35. 32 is fixed to the innermost peripheral portion 32A. Here, the innermost peripheral portion 32A of the negative electrode 32 means a portion from the winding start end portion 32B of the negative electrode 32 to a round of the winding core 60 or the hollow portion 30c in the winding direction R. More specifically, the fixing portion 50 fixes the leading end portion 35 of the separators 33 and 34 to the negative electrode mixture layer 32b of the innermost peripheral portion 32A of the negative electrode 32. Further, the plurality of fixing portions 50 are provided at positions overlapping each other in the stacking direction of the separators 33 and 34, that is, in the thickness direction of the separators 33 and 34.

また、本実施形態の二次電池１００において、固定部５０は、図６に示すように、捲回電極群３０の平坦部３０ａに設けられ、湾曲部３０ｂには設けられていない。また、本実施形態の二次電池１００において、固定部５０は、図４及び図５に示すように、セパレータ３３，３４の捲回方向Ｒに直交するセパレータ３３，３４の幅方向Ｗにおいて、幅方向Ｗの端部を含む幅方向Ｗの全幅に亘って設けられている。   Further, in the secondary battery 100 of the present embodiment, as shown in FIG. 6, the fixing portion 50 is provided on the flat portion 30a of the wound electrode group 30, and is not provided on the curved portion 30b. Further, in the secondary battery 100 of the present embodiment, the fixing portion 50 has a width in the width direction W of the separators 33 and 34 orthogonal to the winding direction R of the separators 33 and 34 as shown in FIGS. It is provided over the entire width in the width direction W including the end portion in the direction W.

さらに、セパレータ３３，３４の先捲部３５の外側に負極電極３２の始端部３２Ｂが配置され、負極電極３２の内側のセパレータ３４と、負極電極３２の外側のセパレータ３３との間に挟み込まれる。負極電極３２は、その内側のセパレータ３４及びその外側のセパレータ３３とともに、図５に示す巻芯６０の周りに一周以上に亘って捲回される。   Further, the start end portion 32B of the negative electrode 32 is disposed outside the leading end portion 35 of the separators 33 and 34, and is sandwiched between the separator 34 inside the negative electrode 32 and the separator 33 outside the negative electrode 32. The negative electrode 32 is wound around the core 60 shown in FIG. 5 over one or more turns together with the separator 34 on the inner side and the separator 33 on the outer side.

本実施形態の二次電池１００では、図６に示すように、捲回電極群３０の平坦部３０ａに位置する負極電極３２の始端部３２Ｂを含む部分に、セパレータ３３，３４の先捲部３５の最外周のセパレータ３４が固定部５０を介して固定されている。また、固定部５０は、負極電極３２の始端部３２Ｂを含む部分とセパレータ３３，３４の厚さ方向に重なる先捲部３５のセパレータ３３，３４間に設けられている。これにより、捲回電極群３０の平坦部３０ａにおいて、セパレータ３３の最内周部３３Ａが、負極電極３２の始端部３２Ｂを含む部分に、複数の固定部５０と先捲部３５のセパレータ３３，３４とを介して固定されている。   In the secondary battery 100 of the present embodiment, as shown in FIG. 6, the leading edge portion 35 of the separators 33, 34 is included in a portion including the start end portion 32 </ b> B of the negative electrode 32 positioned on the flat portion 30 a of the wound electrode group 30. The outermost separator 34 is fixed via a fixing portion 50. The fixed portion 50 is provided between the portion including the start end portion 32 </ b> B of the negative electrode 32 and the separators 33 and 34 of the leading end portion 35 overlapping in the thickness direction of the separators 33 and 34. As a result, in the flat portion 30a of the wound electrode group 30, the innermost peripheral portion 33A of the separator 33 includes a plurality of fixed portions 50 and separators 33 of the leading edge portion 35 in a portion including the start end portion 32B of the negative electrode 32. 34 is fixed.

さらに、一周以上に亘って捲回された負極電極３２の外側のセパレータ３３，３４との間に、図５に示すように、正極電極３１の始端部３１Ｂが挟み込まれる。そして、正極電極３１及び負極電極３２は、セパレータ３３，３４を介在させて、巻芯６０の周りに複数周に亘って捲回される。捲回電極群３０の最外周部分では、正極電極３１の外側にセパレータ３４を介して負極電極３２が一周以上に亘って捲回され、さらにその外側にセパレータ３３，３４が一周以上に亘って捲回される。セパレータ３３，３４の終端部は、粘着テープによって捲回電極群３０の最外周のセパレータ３４に固定される。   Furthermore, as shown in FIG. 5, the starting end portion 31 </ b> B of the positive electrode 31 is sandwiched between the separators 33 and 34 outside the negative electrode 32 wound for one or more rounds. The positive electrode 31 and the negative electrode 32 are wound around the core 60 over a plurality of circumferences with the separators 33 and 34 interposed therebetween. In the outermost peripheral portion of the wound electrode group 30, the negative electrode 32 is wound around the outer periphery of the positive electrode 31 via the separator 34 over one round, and the separators 33, 34 are further wound over the outer circumference over the round. Turned. The terminal portions of the separators 33 and 34 are fixed to the outermost separator 34 of the wound electrode group 30 with an adhesive tape.

セパレータ３３，３４は、基材３６と、基材３６の少なくとも一方の面に設けられた耐熱層３７と、を備えている。基材３６は、例えば、電解液を通すことが可能な多孔質フィルムによって構成されている。多孔質フィルムとしては、例えば、ポリオレフィン系の樹脂材料からなる多孔質フィルムを用いることができる。多孔質フィルムの樹脂材料としては、例えば、ポリプロピレン（ＰＰ）、ポリエチレン（ＰＥ）等を用いることができる。
また、多孔質フィルムは、単層多孔質フィルムであってもよく、同一または異種材料からなる複数の多孔質フィルムが積層された積層多孔質フィルムであってもよい。The separators 33 and 34 include a base material 36 and a heat-resistant layer 37 provided on at least one surface of the base material 36. The base material 36 is comprised by the porous film which can let electrolyte solution pass, for example. As the porous film, for example, a porous film made of a polyolefin resin material can be used. As a resin material for the porous film, for example, polypropylene (PP), polyethylene (PE) or the like can be used.
The porous film may be a single-layer porous film or a laminated porous film in which a plurality of porous films made of the same or different materials are laminated.

耐熱層３７は、微粒子からなるフィラーと、無機又は有機酸化物からなるバインダとによって構成されている。耐熱層３７は、例えば、フィラーおよびバインダを混合した樹脂溶液を多孔質フィルム等の基材３６の少なくとも一方の面に塗布し、溶剤を気化させることによって製作することができる。フィラーとしては、例えば、アルミナ（Al2O3）、シ
リカ（SiO2）等の微粒子を用いることができ、耐熱性および絶縁性を有していることが好ましい。また、フィラーは、窒化アルミニウム等の無機窒化物や、ベーマイト（アルミナ水和物）等の微粒子でも良く、耐熱性及び絶縁性を有する微粒子であれば特に制限はない。無機又は有機酸化物を含むバインダとしては、例えば、アクリル系、ポリオレフィン系、フッ素樹脂系、ＳＢＲ系の樹脂材料等を用いることができる。The heat-resistant layer 37 is composed of a filler made of fine particles and a binder made of an inorganic or organic oxide. The heat-resistant layer 37 can be manufactured, for example, by applying a resin solution in which a filler and a binder are mixed to at least one surface of a substrate 36 such as a porous film and evaporating the solvent. As the filler, for example, fine particles such as alumina (Al 2 O 3 ) and silica (SiO 2 ) can be used, and preferably have heat resistance and insulating properties. The filler may be inorganic nitride such as aluminum nitride or fine particles such as boehmite (alumina hydrate), and is not particularly limited as long as it has heat resistance and insulating properties. As the binder containing an inorganic or organic oxide, for example, an acrylic-based, polyolefin-based, fluororesin-based, or SBR-based resin material can be used.

正極電極３１は、正極集電体である正極箔３１ａと、正極箔３１ａの両面に塗布された正極活物質合剤からなる正極合剤層３１ｂとを有している。正極電極３１の幅方向Ｗの一側は、正極合剤層３１ｂが形成されず、正極箔３１ａが露出した箔露出部３１ｃとされている。正極電極３１は、箔露出部３１ｃが負極電極３２の箔露出部３２ｃと巻芯６０の軸方向すなわち捲回軸方向の反対側に配置されて巻芯６０の周りに捲回される。   The positive electrode 31 has a positive electrode foil 31a that is a positive electrode current collector and a positive electrode mixture layer 31b made of a positive electrode active material mixture applied to both surfaces of the positive electrode foil 31a. One side of the positive electrode 31 in the width direction W is a foil exposed portion 31c where the positive electrode mixture layer 31b is not formed and the positive foil 31a is exposed. The positive electrode 31 is wound around the core 60 with the foil exposed portion 31 c disposed on the opposite side of the foil exposed portion 32 c of the negative electrode 32 and the axial direction of the core 60, that is, the winding axis direction.

正極電極３１は、例えば、正極活物質に導電材、結着剤及び分散溶媒を添加して混練した正極活物質合剤を、正極箔３１ａの両面に幅方向Ｗの一側を除いて塗布し、乾燥、プレス、裁断することによって製作することができる。正極箔３１ａとしては、例えば、厚さ約２０μｍのアルミニウム箔を用いることができる。正極箔３１ａの厚みを含まない正極合剤層３１ｂの厚さは、例えば、約９０μｍである。   The positive electrode 31 is formed by, for example, applying a positive electrode active material mixture obtained by adding a conductive material, a binder, and a dispersion solvent to a positive electrode active material and kneading the positive electrode foil 31a on both sides except for one side in the width direction W. It can be produced by drying, pressing and cutting. As the positive electrode foil 31a, for example, an aluminum foil having a thickness of about 20 μm can be used. The thickness of the positive electrode mixture layer 31b not including the thickness of the positive electrode foil 31a is, for example, about 90 μm.

正極活物質合剤の材料としては、例えば、正極活物質として１００重量部のマンガン酸リチウム（化学式ＬｉＭｎ２Ｏ４）を、導電材として１０重量部の鱗片状黒鉛を、結着剤として１０重量部のポリフッ化ビニリデン（以下、ＰＶＤＦという。）を、分散溶媒としてＮ−メチルピロリドン（以下、ＮＭＰという。）を、それぞれ用いることができる。正極活物質は、前記したマンガン酸リチウムに限定されず、例えば、スピネル結晶構造を有する他のマンガン酸リチウム、一部を金属元素で置換又はドープしたリチウムマンガン複合酸化物を用いてもよい。また、正極活物質として、層状結晶構造を有するコバルト酸リチウムやチタン酸リチウム、及びこれらの一部を金属元素で置換又はドープしたリチウム−金属複合酸化物を用いてもよい。As a material of the positive electrode active material mixture, for example, 100 parts by weight of lithium manganate (chemical formula LiMn 2 O 4 ) is used as the positive electrode active material, 10 parts by weight of flaky graphite as the conductive material, and 10% by weight as the binder. Part of polyvinylidene fluoride (hereinafter referred to as PVDF) and N-methylpyrrolidone (hereinafter referred to as NMP) can be used as a dispersion solvent. The positive electrode active material is not limited to the above-described lithium manganate. For example, another lithium manganate having a spinel crystal structure, or a lithium manganese composite oxide partially substituted or doped with a metal element may be used. Further, as the positive electrode active material, lithium cobaltate or lithium titanate having a layered crystal structure, and a lithium-metal composite oxide obtained by substituting or doping a part thereof with a metal element may be used.

負極電極３２は、負極集電体である負極箔３２ａと、負極箔３２ａの両面に塗布された負極活物質合剤からなる負極合剤層３２ｂとを有している。負極電極３２の幅方向Ｗの一側は、負極合剤層３２ｂが形成されず、負極箔３２ａが露出した箔露出部３２ｃとされている。負極電極３２は、その箔露出部３２ｃが正極電極３１の箔露出部３１ｃと巻芯６０の軸方向すなわち捲回軸方向の反対側に配置されて、巻芯６０の周りに捲回される。   The negative electrode 32 has a negative electrode foil 32a that is a negative electrode current collector, and a negative electrode mixture layer 32b made of a negative electrode active material mixture applied to both surfaces of the negative electrode foil 32a. One side of the negative electrode 32 in the width direction W is a foil exposed portion 32c where the negative electrode mixture layer 32b is not formed and the negative foil 32a is exposed. The negative electrode 32 is wound around the core 60, with the foil exposed portion 32 c thereof arranged on the opposite side of the foil exposed portion 31 c of the positive electrode 31 and the axial direction of the core 60, that is, the winding axis direction.

負極電極３２は、例えば、負極活物質に結着剤及び分散溶媒を添加して混練した負極活物質合剤を、幅方向Ｗの一側を除く負極箔３２ａの両面に塗布し、乾燥、プレス、裁断することによって製作することができる。負極箔３２ａとしては、例えば、厚さ約１０μｍの銅箔を用いることができる。負極箔３２ａの厚みを含まない負極合剤層３２ｂの厚さは、例えば、約７０μｍである。   The negative electrode 32 is prepared by, for example, applying a negative electrode active material mixture kneaded by adding a binder and a dispersion solvent to the negative electrode active material on both surfaces of the negative electrode foil 32a except for one side in the width direction W, drying, pressing It can be produced by cutting. As the negative electrode foil 32a, for example, a copper foil with a thickness of about 10 μm can be used. The thickness of the negative electrode mixture layer 32b not including the thickness of the negative electrode foil 32a is, for example, about 70 μm.

負極活物質合剤の材料としては、例えば、負極活物質として１００重量部の非晶質炭素粉末を、結着剤として１０重量部のＰＶＤＦを、分散溶媒としてＮＭＰをそれぞれ用いることができる。負極活物質は、前記した非晶質炭素に限定されず、リチウムイオンを挿入、脱離可能な天然黒鉛や、人造の各種黒鉛材、コークスなどの炭素質材料やＳｉやＳｎなどの化合物（例えば、ＳｉＯ、ＴｉＳｉ２等）、又はそれらの複合材料を用いてもよい。
負極活物質の粒子形状についても特に限定されず、鱗片状、球状、繊維状又は塊状等の粒子形状を適宜選択することができる。As a material for the negative electrode active material mixture, for example, 100 parts by weight of amorphous carbon powder as the negative electrode active material, 10 parts by weight of PVDF as the binder, and NMP as the dispersion solvent can be used. The negative electrode active material is not limited to the above-mentioned amorphous carbon, and natural graphite capable of inserting and removing lithium ions, various artificial graphite materials, carbonaceous materials such as coke, and compounds such as Si and Sn (for example, , SiO, TiSi 2 or the like), or a composite material thereof.
The particle shape of the negative electrode active material is not particularly limited, and a particle shape such as a scale shape, a spherical shape, a fiber shape, or a lump shape can be appropriately selected.

なお、前記した正極合剤層３１ｂ及び負極合剤層３２ｂに用いる結着材は、ＰＶＤＦに限定されない。前記した結着材として、例えば、ポリテトラフルオロエチレン（ＰＴＦＥ）、ポリエチレン、ポリスチレン、ポリブタジエン、ブチルゴム、ニトリルゴム、スチレンブタジエンゴム、多硫化ゴム、ニトロセルロース、シアノエチルセルロース、各種ラテックス、アクリロニトリル、フッ化ビニル、フッ化ビニリデン、フッ化プロピレン、フッ化クロロプレン、アクリル系樹脂などの重合体及びこれらの混合体などを用いてもよい。   The binder used for the positive electrode mixture layer 31b and the negative electrode mixture layer 32b is not limited to PVDF. Examples of the binder include polytetrafluoroethylene (PTFE), polyethylene, polystyrene, polybutadiene, butyl rubber, nitrile rubber, styrene butadiene rubber, polysulfide rubber, nitrocellulose, cyanoethyl cellulose, various latexes, acrylonitrile, and vinyl fluoride. Polymers such as vinylidene fluoride, propylene fluoride, chloroprene fluoride, and acrylic resins, and mixtures thereof may be used.

捲回電極群３０の巻芯６０の軸方向すなわち捲回軸方向において、負極電極３２の負極合剤層３２ｂの幅は、正極電極３１の正極合剤層３１ｂの幅よりも広くなっている。また、捲回電極群３０の最内周と最外周には負極電極３２が捲回されている。これにより、正極電極３１の始端部から終端部まで、正極合剤層３１ｂが負極合剤層３２ｂの間に挟まれている。   In the axial direction of the winding core 60 of the wound electrode group 30, that is, the winding axis direction, the width of the negative electrode mixture layer 32 b of the negative electrode 32 is wider than the width of the positive electrode mixture layer 31 b of the positive electrode 31. A negative electrode 32 is wound around the innermost and outermost circumferences of the wound electrode group 30. Accordingly, the positive electrode mixture layer 31b is sandwiched between the negative electrode mixture layer 32b from the start end portion to the end portion of the positive electrode 31.

前述のように、捲回電極群３０は、偏平形状の巻芯６０の周りにセパレータ３３，３４を介在させて正極電極３１及び負極電極３２を捲回することによって製作される。これにより、捲回電極群３０は、正極電極３１及び負極電極３２が平坦に積層された平坦部３０ａと、平坦部３０ａの両側で正極電極３１及び負極電極３２が湾曲して積層された湾曲部３０ｂとを有する偏平形状に成形される。すなわち、捲回電極群３０は、捲回軸方向から見て、平坦な平坦部３０ａの両端に一対の半円形状の湾曲部３０ｂが形成されている。   As described above, the wound electrode group 30 is manufactured by winding the positive electrode 31 and the negative electrode 32 around the flat core 60 with the separators 33 and 34 interposed therebetween. Accordingly, the wound electrode group 30 includes a flat portion 30a in which the positive electrode 31 and the negative electrode 32 are laminated flat, and a curved portion in which the positive electrode 31 and the negative electrode 32 are bent and laminated on both sides of the flat portion 30a. 30b. That is, the wound electrode group 30 has a pair of semicircular curved portions 30b at both ends of a flat portion 30a as viewed from the winding axis direction.

正極電極３１及び負極電極３２の箔露出部３１ｃ，３２ｃはそれぞれ捲回電極群３０の平坦部３０ａで束ねられ、例えば超音波圧接、抵抗溶接等によって、集電板４０の接続端部４２に接合される。これにより、正極外部端子２０Ａ及び負極外部端子２０Ｂが、それぞれ正極集電板４０Ａ及び負極集電板４０Ｂを介して、捲回電極群３０を構成する正極電極３１及び負極電極３２とそれぞれ電気的に接続される。これにより、捲回電極群３０は、一方の湾曲部３０ｂが電池蓋１２に対向して配置され、捲回軸方向が二次電池１００の幅方向Ｗに沿うように電池缶１１内に挿入され、他方の湾曲部３０ｂが電池缶１１の底面１１ｂに対向して配置される。   The foil exposed portions 31c and 32c of the positive electrode 31 and the negative electrode 32 are respectively bundled by the flat portion 30a of the wound electrode group 30 and joined to the connection end portion 42 of the current collector plate 40 by, for example, ultrasonic pressure welding or resistance welding. Is done. Thus, the positive electrode external terminal 20A and the negative electrode external terminal 20B are electrically connected to the positive electrode 31 and the negative electrode 32 constituting the wound electrode group 30 via the positive electrode current collector plate 40A and the negative electrode current collector plate 40B, respectively. Connected. As a result, the wound electrode group 30 is inserted into the battery can 11 such that one curved portion 30 b is disposed to face the battery lid 12 and the winding axis direction is along the width direction W of the secondary battery 100. The other curved portion 30 b is disposed to face the bottom surface 11 b of the battery can 11.

なお、捲回電極群３０の捲回軸方向において、セパレータ３３，３４の幅は負極合剤層３２ｂの幅よりも広いが、正極電極３１及び負極電極３２の箔露出部３１ｃ，３２ｃは、それぞれセパレータ３３，３４の幅方向Ｗ端部よりも幅方向Ｗ外側に突出している。したがって、セパレータ３３，３４は、箔露出部３１ｃ，３２ｃを束ねて溶接する際の支障にはならない。   In addition, in the winding axis direction of the wound electrode group 30, the widths of the separators 33 and 34 are wider than the width of the negative electrode mixture layer 32b, but the foil exposed portions 31c and 32c of the positive electrode 31 and the negative electrode 32 are respectively The separators 33 and 34 protrude outward in the width direction W from the end portions in the width direction W. Therefore, the separators 33 and 34 do not hinder the foil exposed portions 31c and 32c when bundled and welded.

このような構成を有する二次電池１００は、例えば、外部端子２０の溶接接合部２１の上面にバスバーが溶接され、複数の二次電池１００を直列に接続した組電池として用いられる。二次電池１００は、例えば、発電機等の電力供給源から供給された電力を、外部端子２０及び集電板４０を介して捲回電極群３０に蓄積することで充電される。また、二次電池１００は、捲回電極群３０に蓄積した電力を、集電板４０及び外部端子２０を介して、例えば、モーター等の電力を消費する装置に供給する。   The secondary battery 100 having such a configuration is used, for example, as an assembled battery in which a bus bar is welded to the upper surface of the weld joint 21 of the external terminal 20 and a plurality of secondary batteries 100 are connected in series. The secondary battery 100 is charged by, for example, storing power supplied from a power supply source such as a generator in the wound electrode group 30 via the external terminal 20 and the current collector plate 40. Further, the secondary battery 100 supplies the power stored in the wound electrode group 30 to a device that consumes power, such as a motor, via the current collector plate 40 and the external terminal 20.

以下、本実施形態の二次電池１００の作用について説明する。   Hereinafter, the operation of the secondary battery 100 of the present embodiment will be described.

本実施形態の二次電池１００は、前述のように、最内周に捲回されたセパレータ３３，３４の周りに該セパレータ３３，３４を介在させて正極電極３１及び負極電極３２を捲回した捲回電極群３０を備えている。この捲回電極群３０の製作時に、図５に示すように、セパレータ３３，３４、正極電極３１及び負極電極３２は、巻芯６０の周りに捲回され、捲回終了後に、巻芯６０は捲回電極群３０から抜き取られる。   In the secondary battery 100 of the present embodiment, as described above, the positive electrode 31 and the negative electrode 32 are wound around the separators 33 and 34 wound around the innermost periphery with the separators 33 and 34 interposed therebetween. A wound electrode group 30 is provided. When the wound electrode group 30 is manufactured, as shown in FIG. 5, the separators 33 and 34, the positive electrode 31, and the negative electrode 32 are wound around the winding core 60. Extracted from the wound electrode group 30.

前記特許文献１に記載された従来の電池用電極群では、最内周のセパレータのみが捲回された部分に、正極板も負極板も存在せず、正極板又は負極板との接触による摩擦力を得ることができない。また、電極群の最内周のセパレータのみが捲回された部分は、固定されておらず、始端部が自由端になっている。そのため、前記従来の電池用電極群は、巻芯を抜く際に、最内周のセパレータのみが捲回された部分においてセパレータにズレが生じ、内部短絡する要因になったり、電極群としての体を成さなくなったりする虞がある。   In the conventional battery electrode group described in Patent Document 1, there is no positive electrode plate or negative electrode plate in the portion where only the innermost separator is wound, and friction due to contact with the positive electrode plate or the negative electrode plate. I can't get power. Further, the portion where only the innermost separator of the electrode group is wound is not fixed, and the starting end portion is a free end. Therefore, when the conventional battery electrode group is pulled out of the core, the separator is displaced at the portion where only the innermost separator is wound, causing internal short-circuiting, or the body as an electrode group. May be lost.

これに対し、本実施形態の二次電池１００は、負極電極３２の捲回方向Ｒにおける始端部３２Ｂよりも内周に捲回されたセパレータ３３，３４の少なくとも一部固定する固定部５０を備えている。そのため、本実施形態の二次電池１００は、捲回電極群３０から巻芯６０を抜き取る際に、セパレータ３３の最内周部３３Ａと巻芯６０との間に摩擦力が生じた場合でも、固定部５０によって負極電極３２の始端部３２Ｂよりも内周に捲回されたセパレータ３３，３４のズレを防止できる。   On the other hand, the secondary battery 100 of the present embodiment includes a fixing portion 50 that fixes at least a part of the separators 33 and 34 wound around the inner periphery of the start end portion 32B in the winding direction R of the negative electrode 32. ing. Therefore, when the secondary battery 100 of the present embodiment pulls out the core 60 from the wound electrode group 30, even when a frictional force is generated between the innermost peripheral portion 33A of the separator 33 and the core 60, The fixing portion 50 can prevent the separators 33 and 34 wound around the inner circumference from the start end portion 32B of the negative electrode 32.

また、本実施形態の二次電池１００は、セパレータ３３，３４の先捲部３５において、固定部５０が、内周側のセパレータ３３を外周側のセパレータ３４に固定している。これにより、固定部５０によって負極電極３２の始端部３２Ｂよりも内周に捲回されたセパレータ３３，３４のズレを防止でき、セパレータ３３の最内周部３３Ａのズレを防止することができる。また、本実施形態の二次電池１００は、固定部５０が負極電極３２に固定されている。このように、セパレータ３３，３４と比較して剛性の高い負極電極３２に対してセパレータ３３，３４を固定する固定部５０を有することで、負極電極３２の剛性によってセパレータ３３，３４のズレを防止できる。   Further, in the secondary battery 100 of the present embodiment, the fixing portion 50 fixes the inner circumferential side separator 33 to the outer circumferential side separator 34 in the leading edge portion 35 of the separators 33 and 34. Thereby, the shift | offset | difference of the separators 33 and 34 wound by inner periphery rather than the start end part 32B of the negative electrode 32 by the fixing | fixed part 50 can be prevented, and the shift | offset | difference of 33 A of innermost peripheral parts of the separator 33 can be prevented. Further, in the secondary battery 100 of the present embodiment, the fixing portion 50 is fixed to the negative electrode 32. As described above, since the fixing portion 50 that fixes the separators 33 and 34 to the negative electrode 32 having higher rigidity than the separators 33 and 34 is provided, the separators 33 and 34 are prevented from being displaced due to the rigidity of the negative electrode 32. it can.

特に、捲回電極群３０の最内周に捲回されたセパレータ３３，３４の先捲部３５のうち、巻芯６０に面するセパレータ３３の最内周部３３Ａは、巻芯６０を抜き取る際に巻芯６０に接して摩擦力を受ける可能性のある摩擦領域ＲＡとなる。このような摩擦領域ＲＡを有し、巻芯６０を抜き取る際に最もズレやすいセパレータ３３の最内周部３３Ａの少なくとも一部を、固定部５０及びセパレータ３３，３４を介して負極電極３２に対して固定することで、セパレータ３３の最内周部３３Ａのズレを効果的に防止することができる。   In particular, among the leading end portions 35 of the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30, the innermost peripheral portion 33 </ b> A of the separator 33 facing the core 60 is used when the core 60 is extracted. The friction region RA is likely to be in contact with the winding core 60 and receive a frictional force. At least a part of the innermost peripheral portion 33A of the separator 33 that has such a friction region RA and is most likely to shift when the winding core 60 is pulled out is fixed to the negative electrode 32 via the fixing portion 50 and the separators 33 and 34. And fixing the innermost peripheral portion 33A of the separator 33 can be effectively prevented.

さらに、本実施形態の二次電池１００は、固定部５０が、図６に示すように、最内周に捲回されたセパレータ３３，３４の先捲部３５の捲回方向Ｒにおける始端部３３Ｂ，３４Ｂに設けられている。セパレータ３３，３４の始端部３３Ｂ，３４Ｂは、特にずれが生じやすいことから、セパレータ３３，３４の始端部３３Ｂ，３４Ｂに固定部５０を設けることによって、より効果的にセパレータ３３，３４のズレを防止することができる。特に、セパレータ３３の最内周部３３Ａの始端部３３Ｂを、固定部５０及びセパレータ３３，３４を介して負極電極３２に固定することで、より確実にセパレータ３３，３４のズレを防止することができる。なお、固定部５０が固定される負極電極３２の最内周部３２Ａは、正極電極３１と対向していない不活領域であることから、固定部５０による電池特性などへの影響はない。   Furthermore, in the secondary battery 100 of the present embodiment, as shown in FIG. 6, in the secondary battery 100, the starting end portion 33 </ b> B in the winding direction R of the leading end portion 35 of the separators 33 and 34 wound around the innermost periphery. , 34B. Since the start end portions 33B and 34B of the separators 33 and 34 are particularly likely to be displaced, by providing the fixing portion 50 at the start end portions 33B and 34B of the separators 33 and 34, the displacement of the separators 33 and 34 can be more effectively performed. Can be prevented. In particular, the start end portion 33B of the innermost peripheral portion 33A of the separator 33 is fixed to the negative electrode 32 through the fixing portion 50 and the separators 33 and 34, thereby preventing the displacement of the separators 33 and 34 more reliably. it can. Note that the innermost peripheral portion 32A of the negative electrode 32 to which the fixing portion 50 is fixed is an inactive region that does not face the positive electrode 31, and therefore the battery characteristics and the like by the fixing portion 50 are not affected.

また、本実施形態の二次電池１００において、捲回電極群３０は、平坦部３０ａと湾曲部３０ｂとを有する偏平形状に成形され、固定部５０は、平坦部３０ａに設けられている。巻芯６０の周りに偏平形状に捲回された捲回電極群３０は、捲回が終了して巻芯６０が抜き取られた後、プレスされてより偏平な形状に成形され、捲回電極群３０の大部分が平坦部３０ａとなる。このように、捲回電極群３０の大部分を占める平坦部３０ａに固定部５０を設けることで、最内周のセパレータ３３，３４を負極電極３２に対して固定する面積を十分に確保することができ、セパレータ３３，３４のズレをより確実に防止することができる。   In the secondary battery 100 of the present embodiment, the wound electrode group 30 is formed into a flat shape having a flat portion 30a and a curved portion 30b, and the fixed portion 50 is provided on the flat portion 30a. The wound electrode group 30 wound in a flat shape around the core 60 is pressed to be formed into a flatter shape after the winding is completed after the winding is finished. Most of 30 becomes the flat part 30a. In this way, by providing the fixing portion 50 in the flat portion 30 a that occupies most of the wound electrode group 30, a sufficient area for fixing the innermost separators 33 and 34 to the negative electrode 32 can be secured. And the displacement of the separators 33 and 34 can be more reliably prevented.

また、本実施形態の二次電池１００において、固定部５０は、セパレータ３３，３４の幅方向Ｗの全幅に亘って設けられる。これにより、最内周のセパレータ３３，３４を負極電極３２に対して固定する面積を十分に確保することができ、セパレータ３３，３４のズレをより確実に防止することができる。   In the secondary battery 100 of the present embodiment, the fixing portion 50 is provided over the entire width of the separators 33 and 34 in the width direction W. As a result, a sufficient area for fixing the innermost separators 33 and 34 to the negative electrode 32 can be secured, and displacement of the separators 33 and 34 can be prevented more reliably.

また、固定部５０が、セパレータ３３，３４を溶融及び固化させた熱溶着部である場合には、新たな部材を追加することなく、セパレータ３３，３４の一部を固定部５０にすることができる。また、固定部５０が、粘着剤である場合には、固定部５０を加熱したり乾燥させたりする必要がなく、二次電池１００の製造に要する時間を短縮し、生産性を向上させることが可能になる。また、固定部５０が、接着剤である場合には、セパレータ３３，３４を負極電極３２に対して粘着剤よりも強固に固定することが可能になる。   Moreover, when the fixing | fixed part 50 is the heat welding part which fuse | melted and solidified the separators 33 and 34, a part of separators 33 and 34 can be used as the fixing | fixed part 50, without adding a new member. it can. Moreover, when the fixing | fixed part 50 is an adhesive, it is not necessary to heat or dry the fixing | fixed part 50, shortening the time which manufactures the secondary battery 100, and improving productivity. It becomes possible. Further, when the fixing portion 50 is an adhesive, the separators 33 and 34 can be fixed to the negative electrode 32 more firmly than the adhesive.

以上説明したように、本実施形態の二次電池１００によれば、捲回電極群３０の最内周に捲回されたセパレータ３３，３４の少なくとも一部を正極電極３１及び負極電極３２の少なくとも一方に固定する固定部５０を備えることによって、捲回電極群３０の最内周のセパレータ３３，３４のズレを防止することができる。したがって、本実施形態の二次電池１００によれば、従来よりも二次電池１００の生産性及び歩留りを向上させ、内部短絡をより確実に防止することができる。   As described above, according to the secondary battery 100 of the present embodiment, at least a part of the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30 is at least part of the positive electrode 31 and the negative electrode 32. By providing the fixing portion 50 that is fixed to one side, it is possible to prevent the separators 33 and 34 on the innermost periphery of the wound electrode group 30 from being displaced. Therefore, according to the secondary battery 100 of the present embodiment, the productivity and yield of the secondary battery 100 can be improved as compared with the conventional case, and an internal short circuit can be prevented more reliably.

以下、本実施形態の二次電池１００の固定部５０の変形例１から変形例３について、図７から図９を用いて説明する。   Hereinafter, Modification 1 to Modification 3 of the fixing unit 50 of the secondary battery 100 of the present embodiment will be described with reference to FIGS. 7 to 9.

（変形例１）
図７は、本実施形態の二次電池１００の固定部５０の変形例１を示す図６に相当する拡大断面図である。本変形例において、固定部５０は、セパレータ３３，３４の先捲部３５のうち、セパレータ３３，３４の厚さ方向において、セパレータ３３，３４の始端部３３Ｂ，３４Ｂ、及び、該始端部３３Ｂ，３４Ｂと重なる領域に設けられている。なお、セパレータ３３，３４の先捲部３５の最も外側の負極電極３２に隣接するセパレータ３４の表裏面に設けられた固定部５０の捲回方向Ｒの幅ＷＲ２は、セパレータ３３，３４の始端部３３Ｂ，３４Ｂに設けられた固定部５０の捲回方向Ｒの幅ＷＲ１よりも広くなっている。(Modification 1)
FIG. 7 is an enlarged cross-sectional view corresponding to FIG. 6 illustrating Modification 1 of the fixing portion 50 of the secondary battery 100 of the present embodiment. In the present modified example, the fixing portion 50 includes the leading end portions 35 of the separators 33 and 34, and the start end portions 33B and 34B of the separators 33 and 34 and the start end portions 33B and 34B in the thickness direction of the separators 33 and 34. It is provided in a region overlapping with 34B. The width WR2 in the winding direction R of the fixing portion 50 provided on the front and back surfaces of the separator 34 adjacent to the outermost negative electrode 32 of the leading edge portion 35 of the separators 33 and 34 is the starting end portion of the separators 33 and 34. It is wider than the width WR1 in the winding direction R of the fixing portion 50 provided at 33B, 34B.

前述のように、捲回電極群３０の最内周のセパレータ３３，３４の始端部３３Ｂ，３４Ｂが自由端になると、最内周のセパレータ３３，３４がズレやすくなる。したがって、セパレータ３３，３４の始端部３３Ｂ，３４Ｂを、固定部５０及びセパレータ３３，３４を介して負極電極３２に固定することで、捲回電極群３０の最内周のセパレータ３３，３４のズレを防止することができる。   As described above, when the start end portions 33B and 34B of the innermost separators 33 and 34 of the wound electrode group 30 become free ends, the innermost separators 33 and 34 are easily displaced. Accordingly, the start end portions 33B, 34B of the separators 33, 34 are fixed to the negative electrode 32 via the fixing portion 50 and the separators 33, 34, so that the displacement of the innermost separators 33, 34 of the wound electrode group 30 is increased. Can be prevented.

（変形例２）
図８は、本実施形態の二次電池１００の固定部５０の変形例２を示す図６に相当する拡大断面図である。本変形例において、固定部５０は、セパレータ３３，３４の始端部３３Ｂ，３４Ｂからセパレータ３３，３４の捲回方向Ｒに一周以上に亘って設けられている。これにより、最内周のセパレータ３３，３４を負極電極３２に対して固定する面積をより拡大することができ、セパレータ３３，３４の始端部３３Ｂ，３４Ｂから捲回方向Ｒの一周以上に亘って、セパレータ３３，３４のズレをより確実に防止することができる。また、本変形例において、固定部５０は、捲回電極群３０の湾曲部３０ｂに設けられている。これにより、捲回電極群３０の平坦部３０ａと比較して締め付けの強い湾曲部３０ｂのセパレータ３３，３４のズレを確実に防止することができる。(Modification 2)
FIG. 8 is an enlarged cross-sectional view corresponding to FIG. 6 and showing a second modification of the fixing portion 50 of the secondary battery 100 of the present embodiment. In this modification, the fixing portion 50 is provided over one or more rounds in the winding direction R of the separators 33 and 34 from the start end portions 33B and 34B of the separators 33 and 34. Thereby, the area which fixes separator 33, 34 of the innermost periphery with respect to the negative electrode 32 can be expanded more, and it extends over one round or more of winding direction R from start-end part 33B, 34B of separator 33,34. Further, the displacement of the separators 33 and 34 can be prevented more reliably. In the present modification, the fixed portion 50 is provided on the curved portion 30 b of the wound electrode group 30. Thereby, the shift | offset | difference of the separators 33 and 34 of the curved part 30b with strong clamping | tightening compared with the flat part 30a of the winding electrode group 30 can be prevented reliably.

（変形例３）
図９は、本実施形態の二次電池１００の固定部５０の変形例３を示す図４に相当する拡大断面図である。本変形例において、固定部５０は、セパレータ３３，３４の捲回方向Ｒに直交するセパレータ３３，３４の幅方向Ｗの一部に設けられている。より具体的には、固定部５０は、セパレータ３３，３４の幅方向Ｗの端部に設けられている。(Modification 3)
FIG. 9 is an enlarged cross-sectional view corresponding to FIG. 4 showing Modification 3 of the fixing portion 50 of the secondary battery 100 of the present embodiment. In the present modification, the fixing portion 50 is provided in a part of the width direction W of the separators 33 and 34 orthogonal to the winding direction R of the separators 33 and 34. More specifically, the fixing portion 50 is provided at the end of the separators 33 and 34 in the width direction W.

このように、固定部５０をセパレータ３３，３４の幅方向Ｗの一部に設けることで、セパレータ３３，３４よりも剛性の高い負極電極３２によって、セパレータ３３，３４の幅方向Ｗのズレが防止される。したがって、巻芯６０を抜き取る方向によらずセパレータ３３，３４の幅方向Ｗのズレを防止することができる。また、固定部５０をセパレータ３３，３４の幅方向Ｗの全幅に亘って設ける場合と比較して、固定部５０の材料の使用量を削減することができ、コスト的に有利である。固定部５０は、セパレータ３３，３４の幅方向Ｗの端部に設けることで、固定部５０をセパレータ３３，３４の幅方向Ｗの中央部に設ける場合と比較して、固定部５０の形成を容易にすることができる。   Thus, by providing the fixing portion 50 in a part of the separators 33 and 34 in the width direction W, the negative electrode 32 having rigidity higher than that of the separators 33 and 34 prevents the separators 33 and 34 from being displaced in the width direction W. Is done. Therefore, the shift in the width direction W of the separators 33 and 34 can be prevented regardless of the direction in which the core 60 is pulled out. Moreover, compared with the case where the fixing | fixed part 50 is provided over the full width of the width direction W of the separators 33 and 34, the usage-amount of the material of the fixing | fixed part 50 can be reduced and it is advantageous in cost. The fixing portion 50 is provided at the end of the separators 33 and 34 in the width direction W, so that the fixing portion 50 is formed as compared with the case where the fixing portion 50 is provided in the center portion of the separators 33 and 34 in the width direction W. Can be easily.

以上の固定部５０の変形例１から変形例３は、前述の実施形態１の二次電池１００に適宜組み合わせて適用することができる。   Modification 1 to Modification 3 of the fixing unit 50 described above can be applied in appropriate combination with the secondary battery 100 of Embodiment 1 described above.

［実施形態２］
次に、本発明の二次電池の実施形態２について、図１から図３を援用し、図１０を用いて説明する。図１０は、本発明の実施形態２に係る二次電池の図４に相当する捲回電極群３０の拡大断面図である。[Embodiment 2]
Next, Embodiment 2 of the secondary battery of the present invention will be described with reference to FIGS. 1 to 3 and FIG. FIG. 10 is an enlarged cross-sectional view of the wound electrode group 30 corresponding to FIG. 4 of the secondary battery according to Embodiment 2 of the present invention.

本実施形態の二次電池は、固定部が粘着テープ５０Ａである点で、前述の実施形態１で説明した二次電池１００と異なっている。本実施形態の二次電池のその他の点は、前述の実施形態１の二次電池１００と同一であるため、同一の部分には同一の符号を付して説明を省略する。   The secondary battery of the present embodiment is different from the secondary battery 100 described in the first embodiment in that the fixing portion is the adhesive tape 50A. Since the other points of the secondary battery of the present embodiment are the same as those of the secondary battery 100 of the above-described first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

粘着テープ５０Ａは、一端がセパレータ３３の最内周部３３Ａの巻芯６０に対向する基材３６側の表面に貼付され、他端がセパレータ３３，３４の先捲部３５の外側に捲回された負極電極３２の最内周部３２Ａの箔露出部３２ｃに貼付されている。これにより、粘着テープ５０Ａは、捲回電極群３０の最内周に捲回されたセパレータ３３，３４の少なくとも一部、より詳細には、セパレータ３３の最内周部３３Ａの少なくとも一部を、負極電極３２に固定している。   One end of the adhesive tape 50 </ b> A is affixed to the surface of the base material 36 facing the core 60 of the innermost peripheral portion 33 </ b> A of the separator 33, and the other end is wound outside the leading end portion 35 of the separators 33 and 34. The negative electrode 32 is affixed to the foil exposed portion 32c of the innermost peripheral portion 32A. Thereby, the adhesive tape 50A has at least a part of the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30, more specifically, at least a part of the innermost peripheral part 33A of the separator 33. It is fixed to the negative electrode 32.

粘着テープ５０Ａによって捲回電極群３０の最内周に捲回されたセパレータ３３，３４を負極電極３２に固定するには、まず、粘着テープ５０Ａをセパレータ３３の最内周部３３Ａの幅方向Ｗの端部から突出させた状態で、粘着テープ５０Ａの一端をセパレータ３３の最内周部３３Ａの巻芯６０に対向する面に貼付する。この状態で、前述の実施形態１と同様に、最内周に捲回されたセパレータ３３，３４の周りに、該セパレータ３３，３４を介在させて正極電極３１及び負極電極３２を捲回する。これにより、セパレータ３３の最内周部３３Ａの幅方向Ｗの端部から突出した粘着テープ５０Ａの他端が、負極電極３２の箔露出部３２ｃに貼付される。   In order to fix the separators 33 and 34 wound around the innermost circumference of the wound electrode group 30 by the adhesive tape 50A to the negative electrode 32, first, the adhesive tape 50A is fixed in the width direction W of the innermost circumference 33A of the separator 33. One end of the adhesive tape 50 </ b> A is affixed to the surface of the innermost peripheral portion 33 </ b> A of the separator 33 that faces the core 60 in a state of projecting from the end portion. In this state, as in the first embodiment, the positive electrode 31 and the negative electrode 32 are wound around the separators 33 and 34 wound on the innermost periphery with the separators 33 and 34 interposed therebetween. Thereby, the other end of the adhesive tape 50 </ b> A protruding from the end portion in the width direction W of the innermost peripheral portion 33 </ b> A of the separator 33 is attached to the foil exposed portion 32 c of the negative electrode 32.

本実施形態の二次電池によれば、前述の実施形態１の二次電池と同様に、セパレータ３３，３４よりも剛性の高い負極電極３２にセパレータ３３の最内周部３３Ａを固定することで、前述の実施形態１の二次電池１００と同様の効果を得ることができる。すなわち、本実施形態の二次電池によれば、捲回電極群３０の最内周に捲回されたセパレータ３３，３４の少なくとも一部を正極電極３１及び負極電極３２の少なくとも一方に固定する粘着テープ５０Ａを備えることによって、捲回電極群３０の最内周のセパレータ３３，３４のズレを防止することができる。   According to the secondary battery of the present embodiment, the innermost peripheral portion 33A of the separator 33 is fixed to the negative electrode 32 having higher rigidity than the separators 33 and 34, as in the secondary battery of the first embodiment. The same effects as those of the secondary battery 100 of the first embodiment can be obtained. That is, according to the secondary battery of this embodiment, the adhesive that fixes at least a part of the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30 to at least one of the positive electrode 31 and the negative electrode 32. By providing the tape 50A, it is possible to prevent the separators 33 and 34 on the innermost periphery of the wound electrode group 30 from being displaced.

また、粘着テープ５０Ａは、セパレータ３３，３４の幅方向Ｗの端部に設けられている。したがって、巻芯６０を抜き取る方向によらずセパレータ３３，３４の幅方向Ｗのズレを防止することができる。また、粘着テープ５０Ａを用いることで、粘着テープ５０Ａを貼り付けるだけで負極電極３２に対してセパレータ３３，３４を固定することができ、二次電池の製造を容易にすることができる。   The adhesive tape 50 </ b> A is provided at the end of the separators 33 and 34 in the width direction W. Therefore, the shift in the width direction W of the separators 33 and 34 can be prevented regardless of the direction in which the core 60 is pulled out. Further, by using the adhesive tape 50A, it is possible to fix the separators 33 and 34 to the negative electrode 32 simply by attaching the adhesive tape 50A, and the secondary battery can be easily manufactured.

また、捲回電極群３０の捲回の捲き終わりに位置するセパレータ３３，３４の終端部と最外周のセパレータ３４を固定する粘着テープと同様の粘着テープ５０Ａを固定部として流用することが可能となり、二次電池１００の材料の共通化の観点からも有益である。なお、粘着テープ５０Ａは、捲回電極群３０の平坦部３０ａの少なくとも一部に貼付することが好ましく、負極電極３２の箔露出部３２ｃの集電板４０が接合されない領域に貼付することがより好ましい。   Further, the adhesive tape 50A similar to the adhesive tape that fixes the terminal portions of the separators 33 and 34 positioned at the end of winding of the wound electrode group 30 and the outermost separator 34 can be used as a fixing portion. This is also advantageous from the viewpoint of sharing the material of the secondary battery 100. The adhesive tape 50A is preferably attached to at least a part of the flat portion 30a of the wound electrode group 30, and more preferably attached to a region where the current collector plate 40 of the foil exposed portion 32c of the negative electrode 32 is not joined. preferable.

以下、本実施形態の二次電池の固定部である粘着テープ５０Ａの変形例１及び変形例２について、図１１及び図１２を用いて説明する。   Hereinafter, Modification 1 and Modification 2 of the adhesive tape 50 </ b> A that is a fixing portion of the secondary battery of the present embodiment will be described with reference to FIGS. 11 and 12.

（変形例１）
図１１は、本実施形態の二次電池の固定部である粘着テープ５０Ａの変形例１を示す図１０に相当する拡大断面図である。本変形例において、粘着テープ５０Ａは、一端がセパレータ３３の最内周部３３Ａの巻芯６０に対向する基材３６側の表面に貼付され、負極電極３２の最内周部３２Ａの外側に捲回された正極電極３１の箔露出部３１ｃに貼付されている。これにより、粘着テープ５０Ａは、捲回電極群３０の最内周に捲回されたセパレータ３３，３４の少なくとも一部、より詳細には、セパレータ３３の最内周部３３Ａの少なくとも一部を、正極電極３１に固定している。(Modification 1)
FIG. 11 is an enlarged cross-sectional view corresponding to FIG. 10 showing Modification 1 of the adhesive tape 50A that is a fixing portion of the secondary battery of the present embodiment. In this modification, the adhesive tape 50A is attached to the surface on the base material 36 side, one end of which is opposed to the core 60 of the innermost peripheral portion 33A of the separator 33, and on the outer side of the innermost peripheral portion 32A of the negative electrode 32. It is affixed to the foil exposed portion 31c of the rotated positive electrode 31. Thereby, the adhesive tape 50A has at least a part of the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30, more specifically, at least a part of the innermost peripheral part 33A of the separator 33. The positive electrode 31 is fixed.

粘着テープ５０Ａを正極電極３１に貼付する方法は、前述の負極電極３２に貼付する場合と同様であるが、粘着テープ５０Ａの長さをやや長くする必要がある。また、捲回電極群３０から巻芯６０を抜き取る方向が捲回軸方向の何れの方向になっても、巻芯６０を抜き取る方向の端部又はその反対方向の端部に正極電極３１の箔露出部３１ｃ又は負極電極３２の箔露出部３２ｃの何れかが存在する。したがって、捲回電極群３０を捲回する捲回機の構造上、粘着テープ５０Ａの貼付機構を設けやすい捲回電極群３０の捲回軸方向の端部において、粘着テープ５０Ａによる固定部を形成することができる。   The method of applying the adhesive tape 50A to the positive electrode 31 is the same as that for applying the adhesive tape 50A to the negative electrode 32 described above, but the length of the adhesive tape 50A needs to be slightly longer. In addition, regardless of the winding axis direction in which the winding core 60 is extracted from the wound electrode group 30, the foil of the positive electrode 31 is disposed at the end in the direction in which the winding core 60 is pulled out or in the opposite direction. Either the exposed portion 31c or the foil exposed portion 32c of the negative electrode 32 is present. Therefore, the winding tape group structure for winding the wound electrode group 30 forms a fixing portion by the adhesive tape 50A at the end in the winding axis direction of the wound electrode group 30 where the adhesive tape 50A sticking mechanism is easily provided. can do.

（変形例２）
図１２は、本実施形態の二次電池の固定部である粘着テープ５０Ａの変形例２を示す図１０に相当する拡大断面図である。なお、図１２においては、図１０に示す捲回電極群３０の中空部３０ｃの下方側の部分に対応する部分のみを拡大して示している。本変形例において、捲回電極群３０は、最外周にセパレータ３３，３４が複数周に亘って捲回された後捲部３８を有している。(Modification 2)
FIG. 12 is an enlarged cross-sectional view corresponding to FIG. 10, illustrating a second modification of the adhesive tape 50 </ b> A that is a fixing portion of the secondary battery of the present embodiment. In FIG. 12, only the portion corresponding to the lower portion of the hollow portion 30c of the wound electrode group 30 shown in FIG. 10 is shown enlarged. In the present modification, the wound electrode group 30 has a rear collar portion 38 on which the separators 33 and 34 are wound over a plurality of circumferences on the outermost circumference.

粘着テープ５０Ａは、一端がセパレータ３３の最内周部３３Ａの巻芯６０に対向する基材３６側の表面に貼付され、他端がセパレータ３３，３４の後捲部３８の内側に捲回された負極電極３２の最外周部３２Ｃの箔露出部３２ｃに貼付されている。これにより、粘着テープ５０Ａは、捲回電極群３０の最内周に捲回されたセパレータ３３，３４の少なくとも一部、より詳細には、セパレータ３３の最内周部３３Ａの少なくとも一部を、負極電極３２の最外周部３２Ｃに固定している。   One end of the adhesive tape 50 </ b> A is affixed to the surface of the innermost peripheral portion 33 </ b> A of the separator 33 facing the core 60, and the other end is wound inside the rear flange portion 38 of the separators 33 and 34. The negative electrode 32 is affixed to the foil exposed portion 32c of the outermost peripheral portion 32C. Thereby, the adhesive tape 50A has at least a part of the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30, more specifically, at least a part of the innermost peripheral part 33A of the separator 33. The negative electrode 32 is fixed to the outermost periphery 32C.

粘着テープ５０Ａによって捲回電極群３０の最内周に捲回されたセパレータ３３，３４を負極電極３２の最外周部３２Ｃに固定するには、まず、捲回電極群３０の捲回終了後に、巻芯６０の径を捲回電極群３０の内径よりも縮小させる。そして、巻芯６０と捲回電極群３０の先捲部３５のセパレータ３３の最内周部３３Ａとの間に空間を形成し、セパレータ３３の最内周部３３Ａと負極電極３２の最外周部３２Ｃの箔露出部３２ｃとを、粘着テープ５０Ａを保持したクランプ機構によって挟持する。   In order to fix the separators 33 and 34 wound around the innermost periphery of the wound electrode group 30 by the adhesive tape 50A to the outermost peripheral portion 32C of the negative electrode 32, first, after the winding of the wound electrode group 30 is completed, The diameter of the winding core 60 is made smaller than the inner diameter of the wound electrode group 30. Then, a space is formed between the core 60 and the innermost peripheral portion 33A of the separator 33 of the leading end portion 35 of the wound electrode group 30, and the innermost peripheral portion 33A of the separator 33 and the outermost peripheral portion of the negative electrode 32 are formed. The foil exposed part 32c of 32C is clamped by the clamp mechanism holding the adhesive tape 50A.

これにより、粘着テープ５０Ａは、一端がセパレータ３３の最内周部３３Ａに貼付され、他端が負極電極３２の最外周部３２Ｃの箔露出部３２ｃに貼付され、粘着テープ５０Ａによって捲回電極群３０の最内周に捲回されたセパレータ３３，３４が負極電極３２の最外周部３２Ｃに固定される。なお、粘着テープ５０Ａは、捲回電極群３０の平坦部３０ａの少なくとも一部に貼付することが好ましく、負極電極３２の箔露出部３２ｃの集電板４０が接合されない領域に貼付することがより好ましい。   Thereby, one end of the adhesive tape 50A is attached to the innermost peripheral portion 33A of the separator 33, and the other end is attached to the foil exposed portion 32c of the outermost peripheral portion 32C of the negative electrode 32, and the wound electrode group is attached by the adhesive tape 50A. The separators 33 and 34 wound around the innermost periphery 30 are fixed to the outermost periphery 32 </ b> C of the negative electrode 32. The adhesive tape 50A is preferably attached to at least a part of the flat portion 30a of the wound electrode group 30, and more preferably attached to a region where the current collector plate 40 of the foil exposed portion 32c of the negative electrode 32 is not joined. preferable.

本変形例の粘着テープ５０Ａを備えた二次電池によれば、前述の実施形態２及びその変形例１の二次電池と同様の効果を得ることができる。また、本変形例の粘着テープ５０Ａを備えた二次電池によれば、二次電池の実使用環境化における捲回電極群３０の正極電極３１とセパレータ３３，３４との間への金属異物の混入を防ぐことが可能となり、短絡現象による電圧低下を抑制することができる。   According to the secondary battery including the adhesive tape 50A of the present modification, the same effects as those of the secondary battery of the second embodiment and the modification 1 described above can be obtained. Further, according to the secondary battery provided with the adhesive tape 50A of the present modification, the metal foreign matter between the positive electrode 31 of the wound electrode group 30 and the separators 33 and 34 in the actual use environment of the secondary battery. Mixing can be prevented, and voltage drop due to a short circuit phenomenon can be suppressed.

以上、図面を用いて本発明の実施の形態を詳述してきたが、具体的な構成はこの実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲における設計変更等があっても、それらは本発明に含まれるものである。   The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

３０ 捲回電極群
３０ａ 平坦部
３０ｂ 湾曲部
３１ 正極電極（電極）
３２ 負極電極（電極）
３３ セパレータ
３３Ｂ 始端部
３４ セパレータ
３４Ｂ 始端部
５０ 固定部
５０Ａ 粘着テープ（固定部）
１００ 二次電池
Ｒ 捲回方向
Ｗ 幅方向30 wound electrode group 30a flat portion 30b curved portion 31 positive electrode (electrode)
32 Negative electrode (electrode)
33 Separator 33B Start end 34 Separator 34B Start end 50 Fixed portion 50A Adhesive tape (fixed portion)
100 Secondary battery R Winding direction W Width direction

Claims (13)

セパレータを介在させて電極を巻芯に捲回した後に該巻芯が抜き取られた捲回電極群を備えた二次電池であって、
前記捲回電極群は、前記電極が平坦に積層された平坦部と、該平坦部の両側で前記電極が湾曲して積層された湾曲部とを有する偏平形状に成形され、
前記電極の捲回方向における始端部よりも内周に一周以上に亘って捲回された重なり合う二つの前記セパレータの少なくとも一部を固定する固定部を備え、
前記固定部は、前記平坦部に設けられるとともに前記二つの前記セパレータの捲回方向における始端部に設けられ、前記二つの前記セパレータの重なり合った前記始端部を前記電極に固定していることを特徴とする二次電池。 A secondary battery comprising a wound electrode group in which the winding core is removed after winding the electrode around the winding core with a separator interposed therebetween,
The wound electrode group is formed into a flat shape having a flat portion in which the electrodes are laminated flat, and a curved portion in which the electrodes are bent and laminated on both sides of the flat portion,
A fixing portion for fixing at least a part of two overlapping separators wound on the inner periphery over one or more rounds from the starting end in the winding direction of the electrode;
The fixing portion, wherein with provided on the flat portion provided on the leading end in the winding direction of the two of the separator, that secure the overlapping said leading end of said two of said separator to said electrode Secondary battery. 前記固定部は、前記電極の前記始端部よりも内周に捲回された前記セパレータの先捲部において内周側の前記セパレータを外周側の前記セパレータに固定するとともに、前記先捲部を前記電極の最内周部に固定していることを特徴とする請求項１に記載の二次電池。   The fixing portion fixes the separator on the inner peripheral side to the separator on the outer peripheral side in the leading end portion of the separator wound around the inner periphery from the start end portion of the electrode, and The secondary battery according to claim 1, wherein the secondary battery is fixed to the innermost peripheral portion of the electrode. 前記固定部は、前記電極の前記始端部を含む端部を前記先捲部の最外周の前記セパレータに固定するとともに、前記電極の前記端部と前記セパレータの厚さ方向に重なる前記先捲部の前記セパレータの間に設けられ、
前記平坦部において、前記セパレータの最内周部が前記電極の前記端部に複数の前記固定部と前記先捲部の前記セパレータとを介して固定されていることを特徴とする請求項２に記載の二次電池。 The fixing portion fixes an end portion including the starting end portion of the electrode to the separator on the outermost periphery of the leading end portion, and the leading end portion overlaps the end portion of the electrode and the thickness direction of the separator. Provided between the separators,
The innermost peripheral portion of the separator in the flat portion is fixed to the end portion of the electrode via a plurality of the fixing portions and the separator of the leading edge portion. The secondary battery as described. 前記固定部は、前記電極の合剤層に対して前記先捲部を固定していることを特徴とする請求項３に記載の二次電池。   The secondary battery according to claim 3, wherein the fixing portion fixes the leading end portion to the mixture layer of the electrode. 前記固定部は、前記セパレータの前記始端部から前記捲回方向に一周以上に亘って設けられることを特徴とする請求項１に記載の二次電池。   The secondary battery according to claim 1, wherein the fixing portion is provided over one or more rounds in the winding direction from the starting end portion of the separator. 前記固定部は、前記湾曲部に設けられることを特徴とする請求項１に記載の二次電池。   The secondary battery according to claim 1, wherein the fixing portion is provided in the bending portion. 前記固定部は、前記セパレータの捲回方向に直交する前記セパレータの幅方向の少なくとも一部に設けられることを特徴とする請求項１から請求項６のいずれか一項に記載の二次電池。   The secondary battery according to any one of claims 1 to 6, wherein the fixing portion is provided in at least a part of a width direction of the separator perpendicular to a winding direction of the separator. 前記固定部は、前記幅方向の全幅に亘って設けられることを特徴とする請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein the fixing portion is provided over the entire width in the width direction. 前記固定部は、前記幅方向の端部に設けられることを特徴とする請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein the fixing portion is provided at an end in the width direction. 前記固定部は、粘着テープであることを特徴とする請求項９に記載の二次電池。   The secondary battery according to claim 9, wherein the fixing portion is an adhesive tape. 前記固定部は、前記セパレータを溶融及び固化させた熱溶着部であることを特徴とする請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein the fixing part is a heat welding part in which the separator is melted and solidified. 前記固定部は、粘着剤であることを特徴とする請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein the fixing part is an adhesive. 前記固定部は、接着剤であることを特徴とする請求項７に記載の二次電池。   The secondary battery according to claim 7, wherein the fixing part is an adhesive.
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