JP2013161555A - Flat wound secondary battery and manufacturing method therefor - Google Patents

Flat wound secondary battery and manufacturing method therefor Download PDF

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JP2013161555A
JP2013161555A JP2012020531A JP2012020531A JP2013161555A JP 2013161555 A JP2013161555 A JP 2013161555A JP 2012020531 A JP2012020531 A JP 2012020531A JP 2012020531 A JP2012020531 A JP 2012020531A JP 2013161555 A JP2013161555 A JP 2013161555A
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battery
flat
electrode group
secondary battery
length
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JP5726773B2 (en
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Akira Kojima
亮 小島
Masayuki Hirooka
誠之 廣岡
Naoko Tsukimori
直子 月森
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Vehicle Energy Japan Inc
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Hitachi Vehicle Energy Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Abstract

PROBLEM TO BE SOLVED: To provide a flat wound secondary battery and its manufacturing method in which the clearance between an electrode group and a battery can can be reduced for enhancing the volume efficiency, and the electrode group can be inserted easily into the battery can.SOLUTION: The flat wound secondary battery includes an electrode group 102 obtained by winding a positive electrode and a negative electrode into flat cylindrical shape with a separator interposed therebetween and having a side face consisting of a plane part and a curved surface part, and a flat cylindrical battery can 101 housing the electrode group 102 and having a side face consisting of a plane part and a curved surface part. The clearance between the curved surface part of the electrode group 102 and the curved surface part of the battery can 101 facing this curved surface part is larger than the clearance between the plane part of the electrode group 102 and the plane part of the battery can 101 facing this plane part.

Description

本発明は扁平捲回形二次電池に関し、より詳細には、電気自動車等に搭載される扁平捲回形二次電池及びその製造方法に関する。   The present invention relates to a flat wound secondary battery, and more particularly to a flat wound secondary battery mounted on an electric vehicle or the like and a method for manufacturing the same.

近年、電気自動車等の動力源として、エネルギー密度の高いリチウムイオン二次電池の開発が進められている。リチウムイオン二次電池の中には、帯状の電極を捲回して形成した電極群（「捲回群」とも称する）を用いるものがある。電極群の形状の例としては、円筒形や扁平筒形（以下、単に「扁平形」と称する）が挙げられる。特許文献１には、扁平形の二次電池が記載されている。この二次電池は、扁平形に捲回された電極群を扁平形の電池缶に収納し、電池缶の両端を扁平な形状の蓋（封口板）で密閉している。   In recent years, lithium ion secondary batteries with high energy density have been developed as power sources for electric vehicles and the like. Some lithium ion secondary batteries use an electrode group formed by winding a band-shaped electrode (also referred to as a “winding group”). Examples of the shape of the electrode group include a cylindrical shape and a flat cylindrical shape (hereinafter simply referred to as “flat shape”). Patent Document 1 describes a flat secondary battery. In this secondary battery, an electrode group wound in a flat shape is accommodated in a flat battery can, and both ends of the battery can are sealed with flat lids (sealing plates).

特開２０１１−５４３７８号公報JP 2011-54378 A

扁平捲回形の電極群を用いる二次電池では、体積効率を上げるためには、電極群と電池缶との隙間（間隔）は小さい方が望ましい。しかし、この隙間が小さいと、製造時に必然的に生じる電極群の大きさや電池缶の大きさのバラつきにより、電極群を電池缶に挿入することが困難になる恐れがある。   In a secondary battery using a flat wound electrode group, it is desirable that the gap (interval) between the electrode group and the battery can be small in order to increase volumetric efficiency. However, if this gap is small, it may be difficult to insert the electrode group into the battery can due to variations in the size of the electrode group and the battery can that are inevitably generated during manufacturing.

従来の二次電池では、電極群の電池缶への挿入を容易にするために、電極群と電池缶との隙間をある程度大きく取っており、結果として二次電池の体積効率が低下するという課題がある。   In the conventional secondary battery, in order to facilitate the insertion of the electrode group into the battery can, a gap between the electrode group and the battery can is made large to some extent, and as a result, the volume efficiency of the secondary battery decreases. There is.

本発明は、上記課題に対して、体積効率を高くするために電極群と電池缶の隙間を小さくでき、かつ電極群を電池缶に挿入しやすい扁平捲回形二次電池及びその製造方法を提供することを目的する。   In view of the above problems, the present invention provides a flat wound secondary battery that can reduce the gap between the electrode group and the battery can in order to increase the volumetric efficiency and can be easily inserted into the battery can, and a method for manufacturing the same. The purpose is to provide.

上記課題を解決するために、本発明による扁平捲回形二次電池は、以下のような特徴を有する。正極及び負極をセパレータを介して扁平筒形に捲回し、平面部分と曲面部分とから構成される側面を有する電極群と、前記電極群を収納し、平面部分と曲面部分とから構成される側面を有する扁平筒形の電池缶とを備える扁平捲回形二次電池であって、前記電極群の前記曲面部分と、この曲面部分に対向する前記電池缶の前記曲面部分との間隔は、前記電極群の前記平面部分と、この平面部分に対向する前記電池缶の前記平面部分との間隔よりも大きい。   In order to solve the above problems, a flat wound secondary battery according to the present invention has the following characteristics. A positive electrode and a negative electrode are wound into a flat cylindrical shape through a separator, and an electrode group having a side surface composed of a flat surface portion and a curved surface portion, and a side surface containing the electrode group and composed of a flat surface portion and a curved surface portion A flat wound secondary battery including a flat cylindrical battery can having a space between the curved portion of the electrode group and the curved portion of the battery can facing the curved portion, The distance between the planar portion of the electrode group and the planar portion of the battery can facing the planar portion is larger.

本発明によれば、体積効率を高くするために電極群と電池缶の隙間を小さくでき、かつ電極群を電池缶に挿入しやすい扁平捲回形二次電池及びその製造方法を得ることができる。   According to the present invention, it is possible to obtain a flat wound secondary battery that can reduce the gap between the electrode group and the battery can in order to increase the volumetric efficiency, and can easily insert the electrode group into the battery can, and a method for manufacturing the same. .

本発明の実施例による扁平捲回形二次電池を示す図。The figure which shows the flat wound secondary battery by the Example of this invention. 本発明の実施例による扁平捲回形二次電池の分解斜視図。1 is an exploded perspective view of a flat wound secondary battery according to an embodiment of the present invention. 本発明の実施例による扁平捲回形二次電池の組立工程の手順を示すフロー図。The flowchart which shows the procedure of the assembly process of the flat wound secondary battery by the Example of this invention. 幅方向に圧縮している状態の電池缶の横断面を示す図。The figure which shows the cross section of the battery can of the state compressed in the width direction. 幅方向に圧縮する力を解放した状態の電池缶の横断面を示す図。The figure which shows the cross section of the battery can of the state which released | released the force compressed in the width direction.

本発明による扁平捲回形二次電池は、正極及び負極をセパレータを介して扁平筒形に捲回し、平面部分と曲面部分とから構成される側面を有する電極群（「捲回群」とも称する）と、電極群を収納し、平面部分と曲面部分とから構成される側面を有する扁平筒形の電池缶とを備える扁平捲回形二次電池であって、電極群の曲面部分と、この曲面部分に対向する電池缶の曲面部分との間隔は、電極群の平面部分と、この平面部分に対向する電池缶の平面部分との間隔よりも大きい。   The flat wound secondary battery according to the present invention has a positive electrode and a negative electrode wound in a flat cylindrical shape through a separator, and has an electrode group having a side surface composed of a flat surface portion and a curved surface portion (also referred to as a “winding group”). ) And a flat cylindrical battery can having a side surface composed of a flat surface portion and a curved surface portion, the flat wound secondary battery including the curved surface portion of the electrode group, The distance between the curved surface portion of the battery can facing the curved surface portion is larger than the distance between the flat surface portion of the electrode group and the flat surface portion of the battery can facing the flat surface portion.

本明細書において、扁平形には、長円形（楕円形を含む）、角丸長方形（２つの対向する直線部分とこれらをつなぐ２つの曲線部分とから構成される形状）、及び長方形（角が丸いものも含む）が含まれる。また、扁平筒形のことを、単に「扁平形」と称する。すなわち、扁平筒形には、電極群の捲回軸方向に垂直な断面が、長円形である筒形、角丸長方形である筒形、及び長方形である筒形が含まれる。   In the present specification, the flat shape includes an oval shape (including an oval shape), a rounded rectangle shape (a shape composed of two opposing straight line portions and two curved portions connecting them), and a rectangular shape (with corners). Including round ones). The flat cylindrical shape is simply referred to as “flat shape”. That is, the flat cylindrical shape includes a cylindrical shape in which the cross section perpendicular to the winding axis direction of the electrode group is an oval, a rounded rectangular shape, and a rectangular shape.

以下、本発明の実施例による扁平捲回形二次電池を、図１〜図５を用いて説明する。   Hereinafter, a flat wound secondary battery according to an embodiment of the present invention will be described with reference to FIGS.

図１は、本発明の実施例による扁平捲回形二次電池を示す図である。本実施例による扁平捲回形二次電池は、横断面（捲回群の捲回軸方向に垂直な断面）が扁平形の電池缶１０１を有する非水電解液電池１００である。   FIG. 1 is a diagram illustrating a flat wound secondary battery according to an embodiment of the present invention. The flat wound secondary battery according to this embodiment is a non-aqueous electrolyte battery 100 having a battery can 101 having a flat cross section (cross section perpendicular to the winding axis direction of the wound group).

非水電解液電池１００は、電池缶１０１の蓋となる封口板Ａ１１６、封口板Ｂ（図示せず）を備える。封口板Ａ１１６と封口板Ｂからは、外部負荷等との電気的接続に用いられる正極端子１０９と負極端子１１０がそれぞれ突出する。また、封口板Ａ１１６と封口板Ｂは、異常時に内部で発生したガスを排出できるように、金属薄膜で構成されるガス排出弁１０８を備える。封口板Ａ１１６には、電池缶１０１に非水電解液を注液するための孔が設けられる。この孔は、非水電解液の注液後に注液栓１０７で密閉され、電池缶１０１の内部は、外気から隔離される。   The nonaqueous electrolyte battery 100 includes a sealing plate A 116 and a sealing plate B (not shown) that serve as a lid for the battery can 101. From the sealing plate A 116 and the sealing plate B, a positive terminal 109 and a negative terminal 110 that are used for electrical connection with an external load or the like protrude. Further, the sealing plate A116 and the sealing plate B are provided with a gas discharge valve 108 made of a metal thin film so that the gas generated inside can be discharged in the event of an abnormality. The sealing plate A116 is provided with a hole for injecting the non-aqueous electrolyte into the battery can 101. This hole is sealed with an injection plug 107 after the nonaqueous electrolyte is injected, and the inside of the battery can 101 is isolated from the outside air.

図２は、本発明の実施例による扁平捲回形二次電池の分解斜視図である。図２を参照しながら、扁平捲回形二次電池である非水電解液電池１００の組立工程の例を説明する。非水電解液電池１００は、電池缶１０１、正極集電板１０４、負極集電板１０５、捲回群（電極群）１０２、及び絶縁カバー１１１を備える。   FIG. 2 is an exploded perspective view of a flat wound secondary battery according to an embodiment of the present invention. An example of an assembly process of the nonaqueous electrolyte battery 100 that is a flat wound secondary battery will be described with reference to FIG. The nonaqueous electrolyte battery 100 includes a battery can 101, a positive electrode current collector plate 104, a negative electrode current collector plate 105, a wound group (electrode group) 102, and an insulating cover 111.

先ず、横断面の形状が扁平形の電池缶１０１を作製する。電池缶１０１は、弾性材料で作製する。電池缶１０１の材料の具体的な例としては、アルミニウム、ステンレス、鉄、ニッケルなどを挙げることができる。電池缶１０１は、捲回群（電極群）１０２を収納する。   First, the battery can 101 having a flat cross-sectional shape is manufactured. The battery can 101 is made of an elastic material. Specific examples of the material of the battery can 101 include aluminum, stainless steel, iron, nickel, and the like. The battery can 101 accommodates a wound group (electrode group) 102.

捲回群１０２は、帯状の正極板と負極板をセパレータを介して重ね合わせて、捲芯４０４のまわりに捲回することで構成される。捲芯４０４の捲回軸方向の両端には、捲芯開口部４０７が設けられている。正極板と負極板は、それぞれ正極と負極となる。正極板の捲回軸方向の一方の端部には、正極タブ群４０５が形成される。負極板の捲回軸方向の一方の端部には、負極タブ群４０６が形成される。正極タブ群４０５と負極タブ群４０６は、それぞれ正極集電板１０４と負極集電板１０５に溶接する。   The winding group 102 is configured by stacking a belt-like positive electrode plate and a negative electrode plate with a separator interposed therebetween and winding around a core 404. At both ends in the winding axis direction of the core 404, a core opening 407 is provided. The positive electrode plate and the negative electrode plate become a positive electrode and a negative electrode, respectively. A positive electrode tab group 405 is formed at one end of the positive electrode plate in the winding axis direction. A negative electrode tab group 406 is formed at one end of the negative electrode plate in the winding axis direction. The positive electrode tab group 405 and the negative electrode tab group 406 are welded to the positive electrode current collector plate 104 and the negative electrode current collector plate 105, respectively.

正極集電板１０４と負極集電板１０５に、それぞれ正極端子１０９と負極端子１１０を溶接等で接続して固定する。正極集電板１０４と負極集電板１０５には、開口部６０２が設けられており、非水電解液電池１００の内圧が上昇したときの排気経路になっている。また、正極集電板１０４と負極集電板１０５には、集電板凸部６０３が設けられている。正極集電板１０４と負極集電板１０５の集電板凸部６０３は、捲芯４０４の捲芯開口部４０７に嵌合する。   A positive electrode terminal 109 and a negative electrode terminal 110 are connected and fixed to the positive electrode current collector plate 104 and the negative electrode current collector plate 105, respectively, by welding or the like. The positive electrode current collector plate 104 and the negative electrode current collector plate 105 are provided with openings 602, which serve as an exhaust path when the internal pressure of the nonaqueous electrolyte battery 100 increases. The positive current collector 104 and the negative current collector 105 are provided with current collector convex portions 603. The current collector plate convex portions 603 of the positive electrode current collector plate 104 and the negative electrode current collector plate 105 are fitted into the core opening portion 407 of the core 404.

次に、絶縁カバー１１１を正極集電板１０４と負極集電板１０５とに被せる。絶縁カバー１１１は、樹脂成型によって作製され、電極用開口部３０３及びガス放出用開口部３０２を備える。正極端子１０９と負極端子１１０は、電極用開口部３０３を通って突出する。   Next, the insulating cover 111 is placed on the positive electrode current collector plate 104 and the negative electrode current collector plate 105. The insulating cover 111 is produced by resin molding and includes an electrode opening 303 and a gas discharge opening 302. The positive terminal 109 and the negative terminal 110 protrude through the electrode opening 303.

このようにして作製した捲回群１０２、正極集電板１０４、負極集電板１０５、及び絶縁カバー１１１が一体となったものを、電池缶１０１の内部に挿入する。電池缶１０１の正極側は封口板Ａ１１６を用いて、負極側は封口板Ｂ１０３を用いて、電池缶１０１の両端を封口する。   The wound group 102, the positive electrode current collector plate 104, the negative electrode current collector plate 105, and the insulating cover 111 thus manufactured are inserted into the battery can 101. Both ends of the battery can 101 are sealed using a sealing plate A116 on the positive electrode side of the battery can 101 and a sealing plate B103 on the negative electrode side.

封口板Ａ１１６と封口板Ｂ１０３は、扁平形であり、長手方向の一端には電極端子用開口部３０４が配置され、中央部にはガス排出弁（開裂弁）１０８が配置されている。正極側の封口板Ａ１１６は、非水電解液を注入するための注液孔３０１をさらに有する。正極端子１０９と負極端子１１０は、電極端子用開口部３０４を通って突出する。このとき、正極端子１０９と負極端子１１０には、ガスケットＡ１１２とガスケットＢ１１５を取り付ける。ガスケットＡ１１２は電池缶１０１の内側に、ガスケットＢ１１５は電池缶１０１の外側に位置するように、それぞれ取り付ける。ガスケットＡ１１２とガスケットＢ１１５は樹脂製である。封口板Ａ１１６と封口板Ｂ１０３は、電子ビームまたはレーザーで電池缶１０１に溶接する。ガスケットＡ１１２とガスケットＢ１１５は、ナット１１３によって固定する。   The sealing plate A116 and the sealing plate B103 are flat, an electrode terminal opening 304 is disposed at one end in the longitudinal direction, and a gas discharge valve (cleavage valve) 108 is disposed at the center. The positive electrode side sealing plate A116 further has a liquid injection hole 301 for injecting a non-aqueous electrolyte. The positive terminal 109 and the negative terminal 110 protrude through the electrode terminal opening 304. At this time, a gasket A 112 and a gasket B 115 are attached to the positive terminal 109 and the negative terminal 110. The gasket A 112 is attached to the inside of the battery can 101 and the gasket B 115 is attached to the outside of the battery can 101. Gasket A112 and gasket B115 are made of resin. The sealing plate A116 and the sealing plate B103 are welded to the battery can 101 with an electron beam or a laser. The gasket A 112 and the gasket B 115 are fixed by the nut 113.

最後に、低湿度環境下で封口板Ａ１１６の注液孔３０１から非水電解液を注入し、注液孔３０１を注液栓１０７で封止して、電池の組立を終了する。   Finally, a non-aqueous electrolyte is injected from the liquid injection hole 301 of the sealing plate A116 in a low humidity environment, the liquid injection hole 301 is sealed with the liquid injection stopper 107, and the assembly of the battery is completed.

次に、捲回群（電極群）１０２の製造方法について説明する。   Next, a method for manufacturing the wound group (electrode group) 102 will be described.

正極合剤には、８５重量部のＬｉＭＯ２（ＭはＮｉ、Ｃｏ又はＭｎを含む遷移金属）で表される層状リチウム複合酸化物からなる正極活物質、１０重量部のカーボンブラック、及び５重量部のポリフッ化ビニリデンを用いた。正極板は、ＮＭＰ（ノルマルメチルピロリドン）を溶剤として正極合剤を均一なスラリーに調整し、このスラリーをアルミ箔に均一な厚さで塗布し乾燥させた後、このアルミ箔を所定の厚さにプレス成形することにより作製する。 In the positive electrode mixture, a positive electrode active material composed of a layered lithium composite oxide represented by 85 parts by weight of LiMO 2 (M is a transition metal containing Ni, Co, or Mn), 10 parts by weight of carbon black, and 5 parts by weight Part of polyvinylidene fluoride was used. The positive electrode plate is prepared by preparing a uniform slurry of the positive electrode mixture using NMP (normal methyl pyrrolidone) as a solvent, applying the slurry to an aluminum foil with a uniform thickness, and drying the aluminum foil to a predetermined thickness. It is produced by press molding.

負極合剤には、９０重量部の黒鉛、５重量部のカーボンブラック、及び５重量部のポリフッ化ビニリデンを用いた。負極板は、ＮＭＰを溶媒として負極合剤を均一なスラリーに調整し、このスラリーを銅箔に均一な厚さで塗布し乾燥させた後、この銅箔を所定の厚さにプレス成形することにより作製する。   As the negative electrode mixture, 90 parts by weight of graphite, 5 parts by weight of carbon black, and 5 parts by weight of polyvinylidene fluoride were used. The negative electrode plate is prepared by preparing a uniform slurry of the negative electrode mixture using NMP as a solvent, applying the slurry to the copper foil with a uniform thickness, and then drying the copper foil to a predetermined thickness. To make.

正極板と負極板の間にポリエチレン製の微多孔膜等からなるセパレータを配し、これらを捲芯４０４のまわりに渦巻状に捲回して、捲回群１０２を得る。この捲芯４０４は、扁平形（扁平筒形）であり、捲回軸方向に垂直な断面が角丸長方形（２つの対向する直線部分とこれらをつなぐ２つの曲線部分とから構成される形状）である。この角丸長方形を構成する曲線部分は、捲芯４０４の厚さ（角丸長方形の短手方向の長さ）と同じ長さの直径を持つ半円形である。   A separator made of a microporous film made of polyethylene or the like is disposed between the positive electrode plate and the negative electrode plate, and these are wound in a spiral around the core 404 to obtain a wound group 102. The core 404 has a flat shape (flat cylindrical shape), and a cross section perpendicular to the winding axis direction is a rounded rectangle (a shape constituted by two opposing straight portions and two curved portions connecting them). It is. The curved portion constituting this rounded rectangle is a semicircle having a diameter of the same length as the thickness of the core 404 (the length in the short direction of the rounded rectangle).

従って、捲回群１０２は、扁平筒形であり、捲回軸方向に垂直な断面が角丸長方形である。捲回群１０２の側面（捲回軸方向に平行な面）は、互いに対向する２つの平面部分と、これらをつなぎ互いに対向する２つの曲面部分とから構成される。   Therefore, the wound group 102 has a flat cylindrical shape, and a cross section perpendicular to the winding axis direction is a rounded rectangle. A side surface of the winding group 102 (a surface parallel to the winding axis direction) is composed of two plane portions facing each other and two curved surface portions connecting them to each other.

電池缶１０１の形状は、電池の体積効率を高くするために、捲回群１０２と同じ扁平筒形とする。すなわち、電池缶１０１は、捲回軸方向に垂直な断面が角丸長方形であり、側面（捲回軸方向に平行な面）は、互いに対向する２つの平面部分と、これらをつなぎ互いに対向する２つの曲面部分とから構成される。   The shape of the battery can 101 is the same flat cylindrical shape as the wound group 102 in order to increase the volumetric efficiency of the battery. That is, the battery can 101 has a rounded rectangular cross section perpendicular to the winding axis direction, and a side surface (a plane parallel to the winding axis direction) connects the two plane portions facing each other and faces each other. It consists of two curved surface parts.

捲回群１０２と電池缶１０１のそれぞれにおいて、捲回軸方向に垂直な断面での、２つの平面部分を結ぶ方向は、この断面（角丸長方形）の短手方向であり、２つの曲面部分を結ぶ方向は、この断面の長手方向である。   In each of the winding group 102 and the battery can 101, a direction connecting two plane portions in a cross section perpendicular to the winding axis direction is a short direction of the cross section (rounded rectangle), and two curved surface portions. The direction connecting the two is the longitudinal direction of the cross section.

以下、捲回群１０２と電池缶１０１について、厚さと幅を以下のように定義する。厚さとは、捲回軸方向に垂直な断面（角丸長方形）の短手方向の長さであり、幅とは、捲回軸方向に垂直な断面（角丸長方形）の長手方向の長さである。すなわち、電池缶１０１の厚さとは、缶壁の厚さ（内壁と外壁との距離）ではなく、捲回軸方向に垂直な断面の短手方向において、互いに対向する２つの平面部分の距離のことである。なお、電池缶１０１については、厚さと幅を、電池缶１０１の外壁についてではなく、内壁について定める。すなわち、電池缶１０１の厚さとは、捲回軸方向に垂直な断面の短手方向において、互いに対向する２つの平面部分の内壁の距離であり、幅とは、捲回軸方向に垂直な断面の長手方向において、互いに対向する２つの曲面部分の内壁の距離であるとする。   Hereinafter, the thickness and width of the wound group 102 and the battery can 101 are defined as follows. The thickness is the length in the short direction of the cross section perpendicular to the winding axis direction (rounded rectangle), and the width is the length in the long direction of the cross section perpendicular to the winding axis direction (rounded rectangle). It is. That is, the thickness of the battery can 101 is not the thickness of the can wall (the distance between the inner wall and the outer wall) but the distance between the two plane portions facing each other in the short direction of the cross section perpendicular to the winding axis direction. That is. In addition, about the battery can 101, thickness and width are determined not about the outer wall of the battery can 101 but the inner wall. That is, the thickness of the battery can 101 is the distance between the inner walls of two planar portions facing each other in the short direction of the cross section perpendicular to the winding axis direction, and the width is the cross section perpendicular to the winding axis direction. It is assumed that the distance is the distance between the inner walls of two curved portions facing each other in the longitudinal direction.

非水電解液電池１００は、捲回群１０２を電池缶１０１に挿入して組み立てる。このとき、捲回群１０２の側面の曲面部分と、これに対向する電池缶１０１の側面の曲面部分との間隔が、捲回群１０２の側面の平面部分と、これに対向する電池缶１０１の側面の平面部分との間隔よりも大きいと、捲回群１０２を、電池缶１０１との摩擦による巻ズレを起こすことなく電池缶１０１へ挿入することができる。すなわち、捲回群１０２の幅と電池缶１０１の幅との差が、捲回群１０２の厚さと電池缶１０１の厚さとの差よりも大きいと、捲回群１０２を、電池缶１０１との摩擦による巻ズレを起こすことなく電池缶１０１へ挿入することができる。   The nonaqueous electrolyte battery 100 is assembled by inserting the wound group 102 into the battery can 101. At this time, the distance between the curved surface portion of the side surface of the wound group 102 and the curved surface portion of the side surface of the battery can 101 facing this is such that the flat surface portion of the side surface of the wound group 102 and the battery can 101 facing this side. If it is larger than the distance from the flat portion of the side surface, the wound group 102 can be inserted into the battery can 101 without causing winding displacement due to friction with the battery can 101. That is, if the difference between the width of the wound group 102 and the width of the battery can 101 is larger than the difference between the thickness of the wound group 102 and the thickness of the battery can 101, the wound group 102 is separated from the battery can 101. It can be inserted into the battery can 101 without causing winding displacement due to friction.

捲回群１０２の幅と厚さが、電池缶１０１の幅と厚さと同一であると、挿入作業時に、捲回群１０２と電池缶１０１の内壁との摩擦により、捲回群１０２の巻きズレを誘発することがある。また、捲回群１０２の幅や厚さにばらつきが生じて電池缶１０１の幅や厚さよりも大きくなると、捲回群１０２を電池缶１０１へ挿入する作業そのものが不可能になる。   If the width and thickness of the wound group 102 are the same as the width and thickness of the battery can 101, the winding deviation of the wound group 102 is caused by friction between the wound group 102 and the inner wall of the battery can 101 during the insertion operation. May be induced. In addition, when the width and thickness of the wound group 102 vary and become larger than the width and thickness of the battery can 101, the operation of inserting the wound group 102 into the battery can 101 becomes impossible.

本実施例では、電池缶１０１の厚さを捲回群１０２の厚さの約１０１％とし、電池缶１０１の幅を捲回群１０２の幅の約１０４％とした。組立後の電池では、後述する図５に示すように、幅方向においては、電池缶１０１と捲回群１０２との間に空隙５０３ができるが、厚さ方向においては、電池缶１０１と捲回群１０２とは密着する。電池缶１０１の寸法をこのように設定することで、非水電解液電池１００の組立工程で、捲回群１０２を電池缶１０１へ挿入する際に、捲回群１０２の幅を下回らない範囲で電池缶１０１を幅方向に圧縮して弾性変形させ、電池缶１０１を厚さ方向に膨らませ、電池缶１０１の側面の平面部分と捲回群１０２の側面の平面部分との間に空隙を生じさせることにより、スムーズに挿入作業が行える。電池缶１０１の幅方向への圧縮は、電池缶１０１の側面の平面部分の内壁と捲回群１０２の側面の平面部分とが接触しない程度の大きさの空隙が生じるように、行えばよい。   In this embodiment, the thickness of the battery can 101 is about 101% of the thickness of the wound group 102, and the width of the battery can 101 is about 104% of the width of the wound group 102. In the assembled battery, as shown in FIG. 5 described later, a gap 503 is formed between the battery can 101 and the wound group 102 in the width direction, but the battery can 101 and the wound in the thickness direction. The group 102 is in close contact. By setting the dimensions of the battery can 101 in this way, when the wound group 102 is inserted into the battery can 101 in the assembly process of the nonaqueous electrolyte battery 100, the width of the wound group 102 is not less than the range. The battery can 101 is compressed in the width direction to be elastically deformed, and the battery can 101 is expanded in the thickness direction, thereby generating a gap between the flat portion on the side surface of the battery can 101 and the flat portion on the side surface of the wound group 102. Therefore, the insertion operation can be performed smoothly. The battery can 101 may be compressed in the width direction so that a gap having a size such that the inner wall of the flat portion of the side surface of the battery can 101 does not contact the flat portion of the side surface of the wound group 102 is generated.

なお、電池缶１０１の幅と捲回群１０２の幅が等しいと捲回群１０２の巻きズレを誘発する可能性も考えられるが、このときに電池缶１０１と捲回群１０２が接触するのは側面の曲面部分であり、面接触ではなく線接触となるため、巻きズレを誘発する確率は小さいと考えられる。   In addition, if the width of the battery can 101 and the width of the wound group 102 are equal, there is a possibility that the winding deviation of the wound group 102 is induced, but at this time, the battery can 101 and the wound group 102 are in contact with each other. Since it is a curved surface part on the side surface and becomes line contact instead of surface contact, it is considered that the probability of inducing winding deviation is small.

図３は、本発明の実施例による扁平捲回形二次電池（非水電解液電池１００）の組立工程の手順を示すフロー図である。   FIG. 3 is a flowchart showing the procedure of the assembly process of the flat wound secondary battery (non-aqueous electrolyte battery 100) according to the embodiment of the present invention.

Ｓ１０００で、電池缶１０１を幅方向に圧縮し、弾性変形させる。幅方向に圧縮することで、電池缶１０１の厚さを大きくする（厚さ方向に膨らませる）ことができる。   In S1000, the battery can 101 is compressed in the width direction and elastically deformed. By compressing in the width direction, the thickness of the battery can 101 can be increased (inflated in the thickness direction).

図４は、電池缶１０１の横断面（捲回群１０２の捲回軸方向に垂直な断面）を示す図であり、電池缶１０１を幅方向に圧縮している状態を示している。図４では、説明の便宜のために、電池缶１０１に捲回群１０２が収納されている状態の図を示している。図４において、捲回軸方向は紙面に垂直な方向である。   FIG. 4 is a diagram showing a cross section of the battery can 101 (a cross section perpendicular to the winding axis direction of the winding group 102), and shows a state where the battery can 101 is compressed in the width direction. For convenience of explanation, FIG. 4 shows a state where the wound group 102 is stored in the battery can 101. In FIG. 4, the winding axis direction is a direction perpendicular to the paper surface.

治具５０２等を用いて、電池缶１０１を幅方向に圧縮して弾性変形させる。すると、電池缶１０１は変形して、側面の平面部分が電池缶１０１の外部方向に向かって膨らむ。この結果、電池缶１０１の側面の平面部分には、厚さ方向の空隙５０１が生じる。この厚さ方向の空隙５０１は、電池缶１０１に捲回群１０２を挿入したときに、電池缶１０１の側面の平面部分と捲回群１０２の側面の平面部分との間に位置する。   The battery can 101 is compressed in the width direction and elastically deformed using the jig 502 or the like. Then, the battery can 101 is deformed, and the flat portion of the side surface swells toward the outside of the battery can 101. As a result, a gap 501 in the thickness direction is generated in the plane portion of the side surface of the battery can 101. The gap 501 in the thickness direction is located between the flat portion on the side surface of the battery can 101 and the flat portion on the side surface of the wound group 102 when the wound group 102 is inserted into the battery can 101.

電池缶１０１を幅方向に圧縮する際には、図４に示したように、２つの治具５０２を用いて幅方向の両側から電池缶１０１の中央に向けて（中心軸に向けて）圧縮してもよいし、幅方向の一端を固定して他端のみから電池缶１０１の中央に向けて（中心軸に向けて）圧縮してもよい。   When the battery can 101 is compressed in the width direction, as shown in FIG. 4, compression is performed from both sides in the width direction toward the center of the battery can 101 (toward the central axis) using two jigs 502. Alternatively, one end in the width direction may be fixed and compressed from only the other end toward the center of the battery can 101 (toward the central axis).

図３のＳ１０１０では、電池缶１０１を幅方向に圧縮して厚さ方向の空隙５０１が生じている状態で、電池缶１０１に捲回群１０２を挿入して収納する。前述したように、電池缶１０１に捲回群１０２が収納されている状態は、図４に示している。厚さ方向の空隙５０１の存在により、捲回群１０２と電池缶１０１の内壁との間で、側面の平面部分の摩擦が起こらない。従って、捲回群１０２の挿入作業を、巻きズレを起こさずにスムーズに行える。   In S1010 of FIG. 3, the wound group 102 is inserted and stored in the battery can 101 in a state where the battery can 101 is compressed in the width direction to form the gap 501 in the thickness direction. As described above, the state where the wound group 102 is accommodated in the battery can 101 is shown in FIG. Due to the presence of the gap 501 in the thickness direction, the friction of the flat portion of the side surface does not occur between the wound group 102 and the inner wall of the battery can 101. Therefore, the insertion operation of the wound group 102 can be performed smoothly without causing winding deviation.

Ｓ１０２０では、電池缶１０１に捲回群１０２を挿入して収納した後、電池缶１０１の圧縮を解除し、電池缶１０１を幅方向に圧縮する力を解放する。   In S1020, after the wound group 102 is inserted and stored in the battery can 101, the compression of the battery can 101 is released, and the force to compress the battery can 101 in the width direction is released.

図５は、電池缶１０１の横断面を示す図であり、電池缶１０１を幅方向に圧縮する力を解放した状態を示している。電池缶１０１は、弾性材料で作製されているので、圧縮前の形状に戻る（電池缶１０１の形状と寸法は、圧縮の前後で変化しない）。すなわち、圧縮する力を解放した後でも、電池缶１０１の厚さは、捲回群１０２の厚さの約１０１％であり、電池缶１０１の幅は、捲回群１０２の幅の約１０４％である。図５に示すように、厚さ方向では、捲回群１０２と電池缶１０１とがほぼ密着した状態を得ることができる。幅方向では、電池缶１０１の側面の曲面部分と捲回群１０２の側面の曲面部分との間に、幅方向の空隙５０３が生じている。   FIG. 5 is a diagram showing a cross section of the battery can 101, and shows a state where the force for compressing the battery can 101 in the width direction is released. Since the battery can 101 is made of an elastic material, it returns to the shape before compression (the shape and dimensions of the battery can 101 do not change before and after compression). That is, even after releasing the compression force, the thickness of the battery can 101 is about 101% of the thickness of the wound group 102, and the width of the battery can 101 is about 104% of the width of the wound group 102. It is. As shown in FIG. 5, it is possible to obtain a state in which the wound group 102 and the battery can 101 are substantially in close contact with each other in the thickness direction. In the width direction, a gap 503 in the width direction is generated between the curved surface portion of the side surface of the battery can 101 and the curved surface portion of the side surface of the wound group 102.

図３のＳ１０３０では、電池缶１０１に封口板Ａ１１６と封口板Ｂ１０３を溶接する。Ｓ１０４０では、電池缶１０１に非水電解液を注入する。Ｓ１０５０では、注液孔３０１を注液栓１０７で密閉して、電池の組立を終了する。   In S1030 of FIG. 3, the sealing plate A116 and the sealing plate B103 are welded to the battery can 101. In S1040, a non-aqueous electrolyte is injected into the battery can 101. In S1050, the liquid injection hole 301 is sealed with the liquid injection stopper 107, and the battery assembly is completed.

Ｓ１０２０の状態（図５）では、幅方向の空隙５０３が存在するので、電池缶１０１の内部で捲回群１０２が移動しうる。しかし、図２に示したように、組立後の電池では、正極端子１０９と負極端子１１０（これらの端子は、それぞれ、捲回群１０２に取り付けられた正極集電板１０４と負極集電板１０５に溶接されている）の位置と、封口板Ａ１１６と封口板Ｂ１０３の電極端子用開口部３０４（正極端子１０９と負極端子１１０は、ガスケットＡ１１２とガスケットＢ１１５を介して、電極端子用開口部３０４を貫通する）の位置とを適切に決定することで、捲回群１０２が電池缶１０１の内部で移動するのを防ぐことができる。通常は、捲回群１０２が電池缶１０１の中央に配置されるように、正極端子１０９と負極端子１１０の位置と電極端子用開口部３０４の位置とを決定する。   In the state of S1020 (FIG. 5), since the gap 503 in the width direction exists, the wound group 102 can move inside the battery can 101. However, as shown in FIG. 2, in the assembled battery, the positive terminal 109 and the negative terminal 110 (these terminals are the positive current collector 104 and the negative current collector 105 attached to the wound group 102, respectively. And the electrode terminal opening 304 of the sealing plate A116 and the sealing plate B103 (the positive terminal 109 and the negative terminal 110 are connected to the electrode terminal opening 304 via the gasket A112 and the gasket B115). By appropriately determining the position of “penetrating”, the winding group 102 can be prevented from moving inside the battery can 101. Normally, the positions of the positive terminal 109 and the negative terminal 110 and the position of the electrode terminal opening 304 are determined so that the wound group 102 is arranged at the center of the battery can 101.

上記の実施例では、電池缶１０１の厚さを捲回群１０２の厚さの約１０１％とし、電池缶１０１の幅を捲回群１０２の幅の約１０４％としたが、この値に限られるものではない。好ましい値の範囲は、電池缶１０１の厚さは、捲回群１０２の厚さの１００％以上１０２％以下であり、電池缶１０１の幅は、捲回群１０２の幅の１００％より大きく１０５％以下である。捲回群１０２の厚さや幅と比べて電池缶１０１の厚さや幅が大きすぎると、電池の体積が大きくなり、電池の体積効率が低下する。また、電池缶１０１の厚さや幅が小さすぎると、捲回群１０２の挿入作業時に電池缶１０１を幅方向に圧縮して厚さを大きくする効果が小さくなる。従って、上記の値の範囲が好ましい。   In the above embodiment, the thickness of the battery can 101 is about 101% of the thickness of the wound group 102, and the width of the battery can 101 is about 104% of the width of the wound group 102. It is not something that can be done. A preferable value range is that the thickness of the battery can 101 is 100% or more and 102% or less of the thickness of the wound group 102, and the width of the battery can 101 is larger than 100% of the width of the wound group 102. % Or less. If the thickness or width of the battery can 101 is too large compared to the thickness or width of the wound group 102, the volume of the battery increases and the volume efficiency of the battery decreases. If the thickness and width of the battery can 101 are too small, the effect of increasing the thickness by compressing the battery can 101 in the width direction during insertion of the wound group 102 is reduced. Therefore, the above range of values is preferred.

従来の扁平捲回形二次電池では、捲回群１０２を電池缶１０１へ挿入する際に、電池缶１０１と捲回群１０２との摩擦を小さくして捲回群１０２の巻きズレを防止するために、電池缶１０１と捲回群１０２との間に隙間（厚さ方向の空隙と幅方向の空隙）を設けている。従来の扁平捲回形二次電池では、これらの空隙の大きさは、厚さ方向と幅方向とで同じである、または厚さ方向が幅方向よりも大きい。厚さ方向の空隙が幅方向の空隙よりも大きい理由は、電池缶１０１と捲回群１０２の側面の平面部分では、面接触により大きな摩擦が起こって巻きズレを起こす確率が大きいので、このような摩擦を小さくするためである。しかし、このような構造では、電池缶１０１の体積が大きくなり、二次電池の体積効率が低下する。   In the conventional flat wound secondary battery, when the wound group 102 is inserted into the battery can 101, friction between the battery can 101 and the wound group 102 is reduced to prevent winding deviation of the wound group 102. Therefore, a gap (a gap in the thickness direction and a gap in the width direction) is provided between the battery can 101 and the wound group 102. In the conventional flat wound secondary battery, the size of these voids is the same in the thickness direction and the width direction, or the thickness direction is larger than the width direction. The reason why the gap in the thickness direction is larger than the gap in the width direction is that there is a high probability that the friction between the battery can 101 and the side surface of the wound group 102 will cause large friction due to surface contact and cause winding displacement. This is to reduce the friction. However, in such a structure, the volume of the battery can 101 increases, and the volume efficiency of the secondary battery decreases.

本実施例による二次電池では、図５に示したように、厚さ方向では、捲回群１０２と電池缶１０１とがほぼ密着した状態を得ることができる。また、上述したように、電池缶１０１の幅方向への圧縮は、電池缶１０１の側面の平面部分の内壁と捲回群１０２の側面の平面部分とが接触しない程度の大きさの空隙（厚さ方向の空隙５０１）が生じるように、行えばよい。従って、幅方向の空隙５０３は、この程度の大きさの厚さ方向の空隙５０１が、電池缶１０１を幅方向へ圧縮したときに生じるような大きさであれば十分であり、適度に小さくすることが可能である。この結果、本実施例による二次電池では、電池缶１０１の体積を小さくして体積効率を高くすることができる。   In the secondary battery according to this example, as shown in FIG. 5, it is possible to obtain a state in which the wound group 102 and the battery can 101 are substantially in close contact with each other in the thickness direction. Further, as described above, the compression in the width direction of the battery can 101 is such that the inner wall of the planar portion on the side surface of the battery can 101 and the gap (thickness) such that the planar portion on the side surface of the wound group 102 does not contact each other. What is necessary is just to carry out so that the space | gap 501) of a horizontal direction may arise. Accordingly, the gap 503 in the width direction is sufficient if the gap 501 in the thickness direction of this size is large enough to be generated when the battery can 101 is compressed in the width direction, and is appropriately reduced. It is possible. As a result, in the secondary battery according to the present embodiment, the volume of the battery can 101 can be reduced to increase the volume efficiency.

幅方向の空隙５０３の好ましい大きさ（電池缶１０１の側面の曲面部分と捲回群１０２の側面の曲面部分との間隔の好ましい値）は、次のようにして導くことができる。   A preferable size of the gap 503 in the width direction (a preferable value of the interval between the curved surface portion of the side surface of the battery can 101 and the curved surface portion of the side surface of the wound group 102) can be derived as follows.

捲回群１０２を、電池缶１０１との摩擦による巻ズレを起こすことなく電池缶１０１へ挿入する際には、電池缶１０１の側面の平面部分と捲回群１０２の側面の平面部分との間に、０．２ｍｍ程度以上の間隔（厚さ方向の空隙５０１）があることが望ましい。本実施例では、この間隔を生じさせるために、電池缶１０１を幅方向へ圧縮して弾性変形させる。このとき、幅方向への圧縮によって生じる電池缶１０１の厚さ方向の変形（膨張）の大きさは、幅方向への圧縮の大きさよりも大きくなるのが必然である。従って、電池缶１０１の側面の平面部分と捲回群１０２の側面の平面部分との間に０．２ｍｍ以上の間隔を生じさせるために必要な幅方向への圧縮の大きさ（長さ）は、幅方向の片側あたり０．２ｍｍ以上である。すなわち、電池缶１０１の側面の曲面部分と捲回群１０２の側面の曲面部分との間隔（幅方向の空隙５０３）は、０．２ｍｍ以上であれば十分である。従って、幅方向の空隙５０３の好ましい大きさは、０．２ｍｍ以上であり、この範囲内でなるべく小さい方がよい。   When the winding group 102 is inserted into the battery can 101 without causing a winding shift due to friction with the battery can 101, the space between the plane portion of the side surface of the battery can 101 and the plane portion of the side surface of the winding group 102 is between Further, it is desirable that there is an interval (gap 501 in the thickness direction) of about 0.2 mm or more. In this embodiment, in order to generate this interval, the battery can 101 is compressed in the width direction and elastically deformed. At this time, the deformation (expansion) in the thickness direction of the battery can 101 caused by the compression in the width direction is inevitably larger than the compression in the width direction. Therefore, the amount of compression (length) in the width direction necessary to generate a space of 0.2 mm or more between the flat portion on the side surface of the battery can 101 and the flat portion on the side surface of the wound group 102 is as follows. The width is 0.2 mm or more per one side in the width direction. That is, it is sufficient that the distance between the curved surface portion of the side surface of the battery can 101 and the curved surface portion of the side surface of the wound group 102 (the gap 503 in the width direction) is 0.2 mm or more. Therefore, the preferable size of the gap 503 in the width direction is 0.2 mm or more, and it is preferable that the size is as small as possible within this range.

１００…非水電解液電池、１０１…電池缶、１０２…捲回群、１０３…封口板Ｂ、１０４…正極集電板、１０５…負極集電板、１０７…注液栓、１０８…ガス排出弁、１０９…正極端子、１１０…負極端子、１１１…絶縁カバー、１１２…ガスケットＡ、１１３…ナット、１１５…ガスケットＢ、１１６…封口板Ａ、３０１…注液孔、３０２…ガス放出用開口部、３０３…電極用開口部、３０４…電極端子用開口部、４０４…捲芯、４０５…正極タブ群、４０６…負極タブ群、４０７…捲芯開口部、５０１…厚さ方向の空隙、５０２…治具、５０３…幅方向の空隙、６０２…開口部、６０３…集電板凸部。   DESCRIPTION OF SYMBOLS 100 ... Non-aqueous electrolyte battery, 101 ... Battery can, 102 ... Winding group, 103 ... Sealing plate B, 104 ... Positive electrode current collecting plate, 105 ... Negative electrode current collecting plate, 107 ... Injection plug, 108 ... Gas discharge valve 109 ... Positive electrode terminal, 110 ... Negative electrode terminal, 111 ... Insulating cover, 112 ... Gasket A, 113 ... Nut, 115 ... Gasket B, 116 ... Sealing plate A, 301 ... Injection hole, 302 ... Opening for gas release, DESCRIPTION OF SYMBOLS 303 ... Electrode opening, 304 ... Electrode terminal opening, 404 ... Core, 405 ... Positive electrode tab group, 406 ... Negative electrode tab group, 407 ... Core core opening, 501 ... Thickness direction gap, 502 ... Oji 503... Gaps in the width direction, 602... Opening, 603.

Claims (8)

正極及び負極をセパレータを介して扁平筒形に捲回し、平面部分と曲面部分とから構成される側面を有する電極群と、前記電極群を収納し、平面部分と曲面部分とから構成される側面を有する扁平筒形の電池缶とを備える扁平捲回形二次電池であって、
前記電極群の前記曲面部分と、この曲面部分に対向する前記電池缶の前記曲面部分との間隔は、前記電極群の前記平面部分と、この平面部分に対向する前記電池缶の前記平面部分との間隔よりも大きい、
ことを特徴とする扁平捲回形二次電池。 A positive electrode and a negative electrode are wound into a flat cylindrical shape through a separator, and an electrode group having a side surface composed of a flat surface portion and a curved surface portion, and a side surface containing the electrode group and composed of a flat surface portion and a curved surface portion A flat wound secondary battery comprising a flat cylindrical battery can having
The distance between the curved portion of the electrode group and the curved portion of the battery can facing the curved portion is the plane portion of the electrode group and the flat portion of the battery can facing the flat portion. Greater than the spacing of
A flat wound secondary battery characterized by the above. 請求項１記載の扁平捲回形二次電池において、
前記電極群の捲回軸方向に垂直な断面において、前記電池缶の短手方向の長さは、前記電極群の短手方向の長さの１００％以上１０２％以下であり、
前記電極群の捲回軸方向に垂直な断面において、前記電池缶の長手方向の長さは、前記電極群の長手方向の長さの１００％より大きく１０５％以下である扁平捲回形二次電池。 The flat wound secondary battery according to claim 1,
In the cross section perpendicular to the winding axis direction of the electrode group, the length in the short direction of the battery can is 100% or more and 102% or less of the length in the short direction of the electrode group,
In a cross section perpendicular to the winding axis direction of the electrode group, the length in the longitudinal direction of the battery can is greater than 100% and not more than 105% of the length in the longitudinal direction of the electrode group. battery. 請求項１記載の扁平捲回形二次電池において、
前記電極群は、２つの前記平面部分と２つの前記曲面部分とから構成される側面を有する扁平筒形であり、
前記電池缶は、２つの前記平面部分と２つの前記曲面部分とから構成される側面を有する扁平筒形であり、
前記電極群の捲回軸方向に垂直な断面において、前記電池缶の前記２つの平面部分を結ぶ方向の長さは、前記電極群の前記２つの平面部分を結ぶ方向の長さの１００％以上１０２％以下であり、
前記電極群の捲回軸方向に垂直な断面において、前記電池缶の前記２つの曲面部分を結ぶ方向の長さは、前記電極群の前記２つの曲面部分を結ぶ方向の長さの１００％より大きく１０５％以下である扁平捲回形二次電池。 The flat wound secondary battery according to claim 1,
The electrode group is a flat cylindrical shape having a side surface composed of two flat portions and two curved portions,
The battery can is a flat cylindrical shape having a side surface composed of two flat portions and two curved portions,
In a cross section perpendicular to the winding axis direction of the electrode group, the length in the direction connecting the two plane portions of the battery can is 100% or more of the length in the direction connecting the two plane portions of the electrode group. 102% or less,
In a cross section perpendicular to the winding axis direction of the electrode group, the length in the direction connecting the two curved surface portions of the battery can is 100% of the length in the direction connecting the two curved surface portions of the electrode group. A flat wound secondary battery having a large capacity of 105% or less. 請求項１記載の扁平捲回形二次電池において、
前記電極群の前記曲面部分と、この曲面部分に対向する前記電池缶の前記曲面部分との間隔は、０．２ｍｍ以上である扁平捲回形二次電池。 The flat wound secondary battery according to claim 1,
A flat wound secondary battery in which an interval between the curved surface portion of the electrode group and the curved surface portion of the battery can facing the curved surface portion is 0.2 mm or more. 正極及び負極をセパレータを介して扁平筒形に捲回し、平面部分と曲面部分とから構成される側面を有する電極群と、前記電極群を収納し、平面部分と曲面部分とから構成される側面を有する扁平筒形の電池缶とを備える扁平捲回形二次電池の製造方法であって、
前記電池缶の前記平面部分が前記電池缶の外部方向に膨らむように、前記電池缶の前記曲面部分を前記電池缶の中央に向けて圧縮する工程と、
前記平面部分が外部方向に膨らんでいる状態の前記電池缶に、前記電極群を挿入して収納する工程と、
前記電池缶の圧縮を解除する工程とを有する、
ことを特徴とする扁平捲回形二次電池の製造方法。 A positive electrode and a negative electrode are wound into a flat cylindrical shape through a separator, and an electrode group having a side surface composed of a flat surface portion and a curved surface portion, and a side surface containing the electrode group and composed of a flat surface portion and a curved surface portion A flat wound secondary battery comprising a flat cylindrical battery can, comprising:
Compressing the curved portion of the battery can toward the center of the battery can such that the planar portion of the battery can expands outward of the battery can;
Inserting and storing the electrode group in the battery can in a state where the planar portion is expanded outward; and
And releasing the compression of the battery can.
A method of manufacturing a flat wound secondary battery. 請求項５記載の扁平捲回形二次電池の製造方法において、
前記圧縮する工程では、前記収納する工程で前記電池缶に前記電極群を挿入する際に、前記電池缶の前記平面部分と前記電極群の前記平面部分との間に０．２ｍｍ以上の間隔ができるように圧縮する扁平捲回形二次電池の製造方法。 In the manufacturing method of the flat wound secondary battery according to claim 5,
In the compressing step, when the electrode group is inserted into the battery can in the storing step, an interval of 0.2 mm or more is provided between the planar portion of the battery can and the planar portion of the electrode group. A method of manufacturing a flat wound secondary battery that is compressed as much as possible. 請求項５記載の扁平捲回形二次電池の製造方法において、
前記電池缶は、前記電極群を収納したときの前記電極群の捲回軸方向に垂直な断面において、短手方向の長さが、前記電極群の短手方向の長さの１００％以上１０２％以下であり、長手方向の長さが、前記電極群の長手方向の長さの１００％より大きく１０５％以下である扁平捲回形二次電池の製造方法。 In the manufacturing method of the flat wound secondary battery according to claim 5,
In the battery can, in the cross section perpendicular to the winding axis direction of the electrode group when the electrode group is accommodated, the length in the short direction is 100% or more of the length in the short direction of the electrode group. % Of the length of the electrode group is larger than 100% of the length of the electrode group in the longitudinal direction and is not more than 105%. 請求項５記載の扁平捲回形二次電池の製造方法において、
前記電極群は、２つの前記平面部分と２つの前記曲面部分とから構成される側面を有する扁平筒形であり、前記電池缶は、２つの前記平面部分と２つの前記曲面部分とから構成される側面を有する扁平筒形であり、
前記電池缶は、前記電極群を収納したときの前記電極群の捲回軸方向に垂直な断面において、前記２つの平面部分を結ぶ方向の長さが、前記電極群の前記２つの平面部分を結ぶ方向の長さの１００％以上１０２％以下であり、前記２つの曲面部分を結ぶ方向の長さが、前記電極群の前記２つの曲面部分を結ぶ方向の長さの１００％より大きく１０５％以下である扁平捲回形二次電池の製造方法。 In the manufacturing method of the flat wound secondary battery according to claim 5,
The electrode group has a flat cylindrical shape having side surfaces constituted by the two flat portions and the two curved portions, and the battery can is constituted by the two flat portions and the two curved portions. A flat cylindrical shape having side surfaces,
The battery can has a length in a direction connecting the two plane portions in a cross section perpendicular to the winding axis direction of the electrode group when the electrode groups are accommodated, and the length of the two plane portions of the electrode group is The length in the connecting direction is 100% or more and 102% or less, and the length in the direction connecting the two curved surface portions is larger than 100% of the length in the direction connecting the two curved surface portions of the electrode group and 105%. The manufacturing method of the flat wound secondary battery which is the following.
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