JP2018147574A - Square Lithium Ion Secondary Battery - Google Patents

Square Lithium Ion Secondary Battery Download PDF

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JP2018147574A
JP2018147574A JP2017038317A JP2017038317A JP2018147574A JP 2018147574 A JP2018147574 A JP 2018147574A JP 2017038317 A JP2017038317 A JP 2017038317A JP 2017038317 A JP2017038317 A JP 2017038317A JP 2018147574 A JP2018147574 A JP 2018147574A
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negative electrode
positive electrode
wound
electrode plate
winding
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JP6862919B2 (en
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実央 野坂
Mio Nosaka
実央 野坂
邦彦 峯谷
Kunihiko Minetani
邦彦 峯谷
井上　雅雄
Masao Inoue
雅雄 井上
藤原　豊樹
Toyoki Fujiwara
豊樹 藤原
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Sanyo Electric Co 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 suppress lithium precipitation on a negative electrode plate located at an outer peripheral side of a winding-end portion of a positive electrode plate.SOLUTION: A square lithium ion secondary battery comprises: a wound electrode body 3; a square outer packaging body 1 having an opening and a bottom part 1a; and a seal plate 2 for sealing the opening of the square outer packaging body 1. In the square lithium ion secondary battery, the wound electrode body 3 has a wound positive electrode core exposed portion 4 and a wound negative electrode core exposed portion 5. The wound negative electrode core exposed portion 5 is connected with a negative electrode current collector 8; an insulative sheet 30 is stuck to each face at an outer peripheral side in the vicinity of a winding end portion 40x of a positive electrode plate 40; a negative electrode plate 50 is disposed through a separator 17 over the winding end portion 40x of the positive electrode plate 40 at the outer peripheral side; the negative electrode current collector 8 has a connection part 8a disposed on an external face of the wound negative electrode core exposed portion 5; and a distance between the connection part 8a and a winding-start side end portion 30x in the insulative sheet 30 in a direction perpendicular to the bottom part 1a is equal to or smaller than 10% of a length L of wound electrode body.SELECTED DRAWING: Figure 6

Description

本発明は、角形リチウムイオン二次電池に関する。   The present invention relates to a prismatic lithium ion secondary battery.

ハイブリッド電気自動車(ＨＥＶ・ＰＨＥＶ)や電気自動車（ＥＶ）等に搭載される車載用の二次電池として、正極板と負極板とをセパレータを介して巻回した偏平状の巻回電極体を備えた角形リチウムイオン二次電池が使用されている。   As a vehicle-mounted secondary battery mounted on a hybrid electric vehicle (HEV / PHEV), an electric vehicle (EV), etc., a flat wound electrode body in which a positive electrode plate and a negative electrode plate are wound via a separator is provided. A rectangular lithium ion secondary battery is used.

このような角形リチウムイオン二次電池において、正極板の巻き終わり側の端部近傍における正負極の短絡を防止することを目的とし、正極板の巻き終わり端部に保護テープを貼り付ける技術が提案されている（特許文献１）。また、車載用の二次電池においては、その用途やサイズ等により様々な集電構造を有する二次電池が提案されている。   In such a prismatic lithium ion secondary battery, a technique for attaching a protective tape to the end of winding of the positive electrode plate is proposed in order to prevent a short circuit between the positive and negative electrodes in the vicinity of the end of the positive electrode on the winding end. (Patent Document 1). As for in-vehicle secondary batteries, secondary batteries having various current collecting structures have been proposed depending on the application, size, and the like.

特開２００９−２４５６８３号公報JP 2009-245683 A

より高い出力特性が求められるＨＥＶ用等の角形リチウムイオン二次電池としては、集電体と芯体の接続位置から外部端子までの導電経路をより短くすることが好ましい。また、集電体の長さを短くすることにより、より重量エネルギー密度の高い二次電池となる。発明者は、このような二次電池の開発を行う中で、巻き終わり端部にテープ等の絶縁シートが貼り付けられた正極板を用いた場合、正極板の巻き終わり端部近傍に貼り付けられた絶縁シートの位置と、集電体と芯体の接続位置の関係によって、負極板において正極板の巻き終わり端部の外周側に位置する部分にリチウム析出が生じる場合があることを見出した。   In a prismatic lithium ion secondary battery for HEV or the like that requires higher output characteristics, it is preferable to shorten the conductive path from the connection position of the current collector and the core to the external terminal. In addition, by reducing the length of the current collector, a secondary battery with higher weight energy density is obtained. When the inventor develops such a secondary battery and uses a positive electrode plate in which an insulating sheet such as a tape is attached to the end of winding, it is attached to the vicinity of the end of winding of the positive electrode. It has been found that lithium deposition may occur in the portion of the negative electrode plate located on the outer peripheral side of the winding end portion of the positive electrode plate, depending on the relationship between the position of the insulating sheet and the connection position of the current collector and the core. .

本発明は、角形リチウムイオン二次電池において、正極板の巻き終わり端部の外周側に位置する負極板上へのリチウム析出を抑制することを目的とする。   An object of the present invention is to suppress lithium deposition on a negative electrode plate located on the outer peripheral side of a winding end portion of a positive electrode plate in a prismatic lithium ion secondary battery.

本発明の一様態の角形リチウムイオン二次電池は、長尺状の正極板と長尺状の負極板を長尺状のセパレータを介して巻回した偏平状の巻回電極体と、開口、底部、一対の第１側壁、及び一対の第２側壁を有する角形外装体と、前記開口を封口する封口板を備えた角形リチウムイオン二次電池であって、前記巻回電極体は、一方の端部に巻回された正極芯体露出部を有し、他方の端部に巻回された負極芯体露出部を有し、前記巻回電極体は、前記巻回電極体の巻回軸が前記底部に対して平行となる向きで前記角形外装体内に配置され、前記巻回された正極芯体露出部には正極集電部材が接続され、前記巻回された負極芯体露出部には負極集電部材が接続され、前記正極板の巻き終わり端部の近傍の外周側の面には絶縁シートが貼り付けられており、前記正極板の巻き終わり端部の外周側には前記セパレータを介して前記負極板が配置され、 前記負極集電部材は、前記巻回された負極芯体露出部の外面上に直接又は樹脂フィルムを介して配置される接続部を有し、前記接続部は、前記負極板において前記正極板の巻き終わり端部よりも外周側に位置する領域における負極芯体露出部上に配置され、前記底部に対して垂直な方向において、前記接続部の前記底部側の端部は前記巻回電極体の中心よりも前記封口板側に位置し、前記底部に対して垂直な方向において、前記接続部と前記絶縁シートにおける巻き始め側端部との距離が、前記
底部に対して垂直な方向における前記巻回電極体の長さの１０％以下である。 A rectangular lithium ion secondary battery according to one aspect of the present invention includes a flat wound electrode body in which a long positive electrode plate and a long negative electrode plate are wound through a long separator, an opening, A rectangular lithium ion secondary battery comprising a rectangular exterior body having a bottom, a pair of first side walls, and a pair of second side walls, and a sealing plate for sealing the opening, wherein the wound electrode body It has a positive electrode core exposed part wound around the end part, and has a negative electrode core exposed part wound around the other end part, and the wound electrode body is a winding axis of the wound electrode body Is disposed in the rectangular exterior body in a direction parallel to the bottom, and a positive electrode current collector is connected to the wound positive electrode core exposed portion, and the wound negative electrode core exposed portion Is connected to a negative electrode current collecting member, and an insulating sheet is attached to the outer peripheral surface near the winding end of the positive electrode plate. The negative electrode plate is disposed on the outer peripheral side of the winding end end portion of the positive electrode plate via the separator, and the negative electrode current collecting member is directly or on the outer surface of the wound negative electrode core exposed portion. A connecting portion disposed through a film, the connecting portion being disposed on the negative electrode core exposed portion in a region located on the outer peripheral side of the negative electrode plate than the winding end of the positive electrode plate, In the direction perpendicular to the bottom portion, the end portion on the bottom portion side of the connection portion is located closer to the sealing plate than the center of the wound electrode body, and in the direction perpendicular to the bottom portion, the connection portion And a distance between the winding start side end portion of the insulating sheet is 10% or less of the length of the wound electrode body in a direction perpendicular to the bottom portion.

巻き終わり端部の近傍の外周側の面に絶縁シートが貼り付けられた正極板を用いた場合、絶縁シートにおける巻き始め側端部の位置と、負極集電部材と負極芯体の接続位置の関係によって、負極板において正極板の巻き終わり端部の外周側に位置する部分にリチウム析出する可能性がある。この原因は、次のように考えられる。正極板の巻き終わり端部の近傍の外周側の面に絶縁シートが貼り付けられている場合、絶縁シートの存在により、正極板の巻き終わり端部近傍と、その外周側に位置する負極板の間に隙間が生じやすい。そして、このような隙間が存在すると、正極板から放出されたリチウムイオンが負極板に十分に吸収されず隙間近傍に位置する負極板上に局所的に集中し、リチウム金属が析出する。そして、隙間の生じやすさや隙間の大きさは、正極板の巻き終わり端部の近傍の外周側の面に貼り付けられた絶縁シートにおける巻き始め側端部の位置と、負極集電部材と負極芯体の接続位置の関係に依存する。   When using a positive electrode plate with an insulating sheet affixed to the outer peripheral surface in the vicinity of the winding end, the position of the winding start side end in the insulating sheet and the connection position of the negative electrode current collector and the negative electrode core Depending on the relationship, lithium may be deposited on a portion of the negative electrode plate located on the outer peripheral side of the end of winding of the positive electrode plate. The cause is considered as follows. When an insulating sheet is affixed to the outer peripheral surface in the vicinity of the winding end end of the positive electrode plate, the presence of the insulating sheet causes a gap between the vicinity of the winding end end of the positive electrode plate and the negative electrode plate located on the outer peripheral side thereof. A gap is likely to occur. When such a gap exists, lithium ions released from the positive electrode plate are not sufficiently absorbed by the negative electrode plate, but locally concentrate on the negative electrode plate located in the vicinity of the gap, and lithium metal is deposited. The ease of gap formation and the size of the gap are determined by the position of the winding start side end portion of the insulating sheet attached to the outer peripheral side surface in the vicinity of the winding end end portion of the positive electrode plate, the negative electrode current collecting member, and the negative electrode Depends on the connection position of the core.

上述の角形リチウムイオン二次電池の構成であると、負極板において正極板の巻き終わり端部の近傍の外周側の面に貼り付けられた絶縁シートにおける巻き始め側端部の外周側に位置する部分の近傍を負極集電部材で押さえることができる。このため、正極板の巻き終わり端部の近傍の外周側の面に貼り付けられた絶縁シートにおける巻き始め側端部の近傍に大きな隙間が生じることが抑制できる。よって、正極板の巻き終わり端部の近傍の外周側に位置する負極板上にリチウムが析出することを抑制できる。   In the configuration of the above-described prismatic lithium ion secondary battery, the negative electrode plate is positioned on the outer peripheral side of the winding start side end portion of the insulating sheet attached to the outer peripheral side surface in the vicinity of the winding end end portion of the positive electrode plate. The vicinity of the portion can be pressed by the negative electrode current collector. For this reason, it can suppress that a big clearance gap produces in the vicinity of the winding start side edge part in the insulating sheet affixed on the surface of the outer peripheral side of the vicinity of the winding end edge part of a positive electrode plate. Therefore, it can suppress that lithium precipitates on the negative electrode plate located in the outer peripheral side of the vicinity of the winding end end part of a positive electrode plate.

前記負極集電部材は負極集電体であり、前記負極集電体は、前記接続部と、前記封口板と前記巻回電極体の間に配置されるベース部と、前記ベース部と前記接続部を繋ぐリード部を有することが好ましい。   The negative electrode current collector is a negative electrode current collector, and the negative electrode current collector includes the connection part, a base part disposed between the sealing plate and the wound electrode body, and the base part and the connection. It is preferable to have a lead part connecting the parts.

前記巻回された負極芯体露出部の一方の外面には負極集電体が接続され、前記巻回された負極芯体露出部の他方の外面には負極集電体受け部品が接続され、前記負極集電体受け部品が前記接続部を含むことが好ましい。   A negative electrode current collector is connected to one outer surface of the wound negative electrode core exposed portion, and a negative electrode current collector receiving component is connected to the other outer surface of the wound negative electrode core exposed portion, It is preferable that the negative electrode current collector receiving component includes the connecting portion.

前記正極板の巻き終わり端部の近傍の外周側の面及び内周側の面に前記絶縁シートが貼り付けられていることが好ましい。   It is preferable that the insulating sheet is attached to the outer peripheral surface and the inner peripheral surface in the vicinity of the winding end end of the positive electrode plate.

前記絶縁シートは、シート基材の表面に糊剤層が形成されたテープであり、前記糊剤層により前記絶縁シートが前記正極板に貼り付けられていることが好ましい。   The insulating sheet is a tape in which a paste layer is formed on the surface of a sheet base material, and the insulating sheet is preferably attached to the positive electrode plate by the paste layer.

本発明の一様態の角形リチウムイオン二次電池は、長尺状の正極板と長尺状の負極板を長尺状のセパレータを介して巻回した偏平状の巻回電極体と、開口、底部、一対の第１側壁、及び一対の第２側壁を有する角形外装体と、前記開口を封口する封口板を備えた角形リチウムイオン二次電池であって、前記巻回電極体は、一方の端部に巻回された正極芯体露出部を有し、他方の端部に巻回された負極芯体露出部を有し、前記巻回電極体は、前記巻回電極体の巻回軸が前記底部に対して平行となる向きで前記角形外装体内に配置され、前記巻回された正極芯体露出部には正極集電部材が接続され、前記巻回された負極芯体露出部には負極集電部材が接続され、前記正極板の巻き終わり端部の近傍の外周側の面には絶縁シートが貼り付けられており、前記負極板において、前記正極板の巻き終わり端部よりも外周側に位置する領域における負極芯体露出部上には、前記負極芯体露出部同士が接合された接合部が配置され、前記底部に対して垂直な方向において、前記接合部の前記底部側の端部は、前記巻回電極体の中心よりも前記封口板側に位置し、前記底部に対して垂直な方向において、前記接合部と前記絶縁シートにおける巻き始め側端部との距離が、前記底部に対して垂直な方向における前記巻回電極体の長さの１０％以下である。   A rectangular lithium ion secondary battery according to one aspect of the present invention includes a flat wound electrode body in which a long positive electrode plate and a long negative electrode plate are wound through a long separator, an opening, A rectangular lithium ion secondary battery comprising a rectangular exterior body having a bottom, a pair of first side walls, and a pair of second side walls, and a sealing plate for sealing the opening, wherein the wound electrode body It has a positive electrode core exposed part wound around the end part, and has a negative electrode core exposed part wound around the other end part, and the wound electrode body is a winding axis of the wound electrode body Is disposed in the rectangular exterior body in a direction parallel to the bottom, and a positive electrode current collector is connected to the wound positive electrode core exposed portion, and the wound negative electrode core exposed portion Is connected to a negative electrode current collecting member, and an insulating sheet is attached to the outer peripheral surface near the winding end of the positive electrode plate. In the negative electrode plate, on the negative electrode core exposed portion in the region located on the outer peripheral side of the winding end end portion of the positive electrode plate, a bonded portion in which the negative electrode core exposed portions are bonded is disposed, In the direction perpendicular to the bottom portion, the end portion on the bottom side of the joint portion is located on the sealing plate side with respect to the center of the wound electrode body, and in the direction perpendicular to the bottom portion, the joint portion The distance between the portion and the winding start side end of the insulating sheet is 10% or less of the length of the wound electrode body in the direction perpendicular to the bottom.

上述の角形リチウムイオン二次電池の構成であると、負極板において正極板の巻き終わり端部の近傍の外周側の面に貼り付けられた絶縁シートにおける巻き始め側端部の外周側に位置する部分の近傍に接合部が存在する。このため、正極板の巻き終わり端部の近傍の外周側の面に貼り付けられた絶縁シートにおける巻き始め側端部の近傍に大きな隙間が生じることが抑制できる。よって、正極板の巻き終わり端部の近傍の外周側に位置する負極板上にリチウムが析出することを抑制できる。   In the configuration of the above-described prismatic lithium ion secondary battery, the negative electrode plate is positioned on the outer peripheral side of the winding start side end portion of the insulating sheet attached to the outer peripheral side surface in the vicinity of the winding end end portion of the positive electrode plate. There is a joint near the part. For this reason, it can suppress that a big clearance gap produces in the vicinity of the winding start side edge part in the insulating sheet affixed on the surface of the outer peripheral side of the vicinity of the winding end edge part of a positive electrode plate. Therefore, it can suppress that lithium precipitates on the negative electrode plate located in the outer peripheral side of the vicinity of the winding end end part of a positive electrode plate.

前記正極板の巻き終わり端部の近傍の外周側の面及び内周側の面に前記絶縁シートが貼り付けられていることが好ましい。   It is preferable that the insulating sheet is attached to the outer peripheral surface and the inner peripheral surface in the vicinity of the winding end end of the positive electrode plate.

前記絶縁シートは、シート基材の表面に糊剤層が形成されたテープであり、前記糊剤層により前記絶縁シートが前記正極板に貼り付けられていることが好ましい。   The insulating sheet is a tape in which a paste layer is formed on the surface of a sheet base material, and the insulating sheet is preferably attached to the positive electrode plate by the paste layer.

本発明によれば、正極板の巻き終わり端部の外周側に位置する負極板上へのリチウム析出を抑制することができる。   ADVANTAGE OF THE INVENTION According to this invention, lithium precipitation on the negative electrode plate located in the outer peripheral side of the winding end end part of a positive electrode plate can be suppressed.

実施形態に係る角形二次電池の斜視図である。It is a perspective view of the square secondary battery concerning an embodiment. 図２Ａは図１におけるＩＩＡ−ＩＩＡ断面の断面図であり、図２Ｂは図１におけるＩＩＢ−ＩＩＢ断面の断面図である。2A is a cross-sectional view taken along the line IIA-IIA in FIG. 1, and FIG. 2B is a cross-sectional view taken along the line IIB-IIB in FIG. 図３Ａは絶縁シートを貼り付ける前の正極板の平面図であり、図３Ｂは絶縁シート貼り付けた後の正極板の平面図である。FIG. 3A is a plan view of the positive electrode plate before attaching the insulating sheet, and FIG. 3B is a plan view of the positive electrode plate after attaching the insulating sheet. 絶縁シートを貼り付けた後の正極板の長手方向に沿った巻き終わり端部近傍の断面図である。It is sectional drawing of the winding end end vicinity along the longitudinal direction of the positive electrode plate after affixing an insulating sheet. 負極板の平面図である。It is a top view of a negative electrode plate. 巻回電極体において正極板の巻き終わり端部が配置される側の面の平面図である。It is a top view of the surface by the side where the winding end part of a positive electrode plate is arrange | positioned in a wound electrode body. 図６における負極集電体近傍の拡大図である。It is an enlarged view of the negative electrode collector vicinity in FIG. 実施形態に係る角形二次電池における巻回電極体の巻回軸に対して垂直な面の断面図であり、正極板の巻き終わり端部近傍の拡大断面図である。It is sectional drawing of a surface perpendicular | vertical with respect to the winding axis | shaft of the winding electrode body in the square secondary battery which concerns on embodiment, and is an expanded sectional view of the winding end end vicinity of a positive electrode plate. 比較例に係る角形二次電池における巻回電極体の巻回軸に対して垂直な面の断面図であり、正極板の巻き終わり端部近傍の拡大断面図である。It is sectional drawing of a surface perpendicular | vertical with respect to the winding axis | shaft of the winding electrode body in the square secondary battery which concerns on a comparative example, and is an expanded sectional view of the winding end end part vicinity of a positive electrode plate. 実施形態に係る角形二次電池における負極集電体近傍の拡大図である。It is an enlarged view near the negative electrode current collector in the rectangular secondary battery according to the embodiment. 実施形態に係る角形二次電池における正極集電体近傍の拡大図である。It is an enlarged view of the positive electrode current collector vicinity in the square secondary battery which concerns on embodiment. 変形例１に係る角形二次電池の巻回電極体において正極板の巻き終わり端部が配置される側の面の平面図である。6 is a plan view of a surface on a side where a winding end end of a positive electrode plate is arranged in a wound electrode body of a prismatic secondary battery according to Modification Example 1. FIG. 変形例１に係る角形二次電池の巻回電極体における負極集電体受け部品の近傍の拡大図である。6 is an enlarged view of the vicinity of a negative electrode current collector receiving component in a wound electrode body of a rectangular secondary battery according to Modification Example 1. FIG. 変形例２に係る角形二次電池の巻回電極体において正極板の巻き終わり端部が配置される側の面の平面図である。10 is a plan view of a surface on a side where a winding end end of a positive electrode plate is arranged in a wound electrode body of a prismatic secondary battery according to Modification Example 2. FIG. 変形例２に係る角形二次電池の巻回電極体における接合部の近傍の拡大図である。10 is an enlarged view of a vicinity of a joint portion in a wound electrode body of a rectangular secondary battery according to Modification Example 2. FIG.

本発明に係る実施形態を、角形リチウムイオン二次電池としての角形二次電池２０を例にして説明する。なお、本発明は以下の形態に限定されない。   An embodiment according to the present invention will be described by taking a square secondary battery 20 as a square lithium ion secondary battery as an example. In addition, this invention is not limited to the following forms.

図１は角形二次電池２０の斜視図である。図２Ａは図１におけるＩＩＡ−ＩＩＡ断面の断面図である。図２Ｂは図１におけるＩＩＢ−ＩＩＢ断面の断面図である。角形二次電池
２０は、開口を有する有底角形筒状の角形外装体１と角形外装体１の開口を封口する封口板２からなる電池ケースを有する。角形外装体１は、底部１ａ、一対の第１側壁１ｂ、一対の第２側壁１ｃを有する。一対の第１側壁１ｂはそれぞれ対向するように配置されている。一対の第２側壁１ｃはそれぞれ対向するように配置されている。第１側壁１ｂの面積は、第２側壁１ｃの面積よりも大きい。 FIG. 1 is a perspective view of a prismatic secondary battery 20. 2A is a cross-sectional view taken along the line IIA-IIA in FIG. 2B is a cross-sectional view taken along the line IIB-IIB in FIG. The prismatic secondary battery 20 includes a battery case including a bottomed rectangular cylindrical prismatic exterior body 1 having an opening and a sealing plate 2 that seals the opening of the prismatic exterior body 1. The rectangular exterior body 1 has a bottom 1a, a pair of first side walls 1b, and a pair of second side walls 1c. The pair of first side walls 1b are arranged to face each other. The pair of second side walls 1c are arranged so as to face each other. The area of the first side wall 1b is larger than the area of the second side wall 1c.

角形外装体１内には、長尺状の正極板４０と長尺状の負極板５０を長尺状のセパレータ１７を介して巻回した偏平状の巻回電極体３が配置される。巻回電極体３はその巻回軸が角形外装体１の底部１ａと平行になる向きで角形外装体１内に配置される。巻回電極体３の巻回軸方向の一方の端部には巻回された正極芯体露出部４が設けられ、他方の端部には巻回された負極芯体露出部５が設けられている。巻回電極体３は、一対の平坦な外面と、一対の平坦な外面を繋ぐ一対の湾曲した外面を有する。巻回電極体３は、一対の平坦な外面がそれぞれ第１側壁１ｂと対向するように配置され、巻回された正極芯体露出部４及び巻回された負極芯体露出部５がそれぞれ第２側壁１ｃと対向するように配置される。なお、角形外装体１と巻回電極体３の間には電気絶縁性の樹脂シート１４が配置されている。   A flat wound electrode body 3 in which a long positive electrode plate 40 and a long negative electrode plate 50 are wound through a long separator 17 is disposed in the rectangular outer package 1. The wound electrode body 3 is disposed in the rectangular exterior body 1 in such a direction that its winding axis is parallel to the bottom 1 a of the rectangular exterior body 1. A wound positive electrode core exposed portion 4 is provided at one end in the winding axis direction of the wound electrode body 3, and a wound negative electrode core exposed portion 5 is provided at the other end. ing. The wound electrode body 3 has a pair of flat outer surfaces and a pair of curved outer surfaces that connect the pair of flat outer surfaces. The wound electrode body 3 is disposed such that a pair of flat outer surfaces face the first side wall 1b, and the wound positive electrode core exposed portion 4 and the wound negative electrode core exposed portion 5 are respectively first. It arrange | positions so that 2 side wall 1c may be opposed. An electrically insulating resin sheet 14 is disposed between the rectangular exterior body 1 and the wound electrode body 3.

巻回された正極芯体露出部４の外面には正極集電体６が接続されている。封口板２には正極端子７が取り付けられている。正極集電体６は正極端子７に電気的に接続されている。封口板２と正極端子７の間には外部側絶縁部材１０が配置され、封口板２と正極集電体６の間には内部側絶縁部材１１が配置されている。巻回された負極芯体露出部５の外面には負極集電体８が接続されている。封口板２には負極端子９が取り付けられている。負極集電体８は負極端子９に電気的に接続されている。封口板２と負極端子９の間には外部側絶縁部材１２が配置され、封口板２と負極集電体８の間には内部側絶縁部材１３が配置されている。巻回された正極芯体露出部４において、正極集電体６が接続された面と反対側の面には、正極集電体受け部品（図示省略）が接続されている。巻回された負極芯体露出部５において、負極集電体８が接続された面と反対側の面には、負極集電体受け部品８０が接続されている。正極集電体６及び正極集電体受け部品が正極側の集電部材に相当する。負極集電体８及び負極集電体受け部品８０が負極側の集電部材に相当する。なお、正極集電体受け部品及び負極集電体受け部品８０は必須の構成ではなく、省略することもできる。   A positive electrode current collector 6 is connected to the outer surface of the wound positive electrode core exposed portion 4. A positive electrode terminal 7 is attached to the sealing plate 2. The positive electrode current collector 6 is electrically connected to the positive electrode terminal 7. An external insulating member 10 is disposed between the sealing plate 2 and the positive electrode terminal 7, and an internal insulating member 11 is disposed between the sealing plate 2 and the positive electrode current collector 6. A negative electrode current collector 8 is connected to the outer surface of the wound negative electrode core exposed portion 5. A negative electrode terminal 9 is attached to the sealing plate 2. The negative electrode current collector 8 is electrically connected to the negative electrode terminal 9. An external insulating member 12 is disposed between the sealing plate 2 and the negative electrode terminal 9, and an internal insulating member 13 is disposed between the sealing plate 2 and the negative electrode current collector 8. In the wound positive electrode core exposed portion 4, a positive electrode current collector receiving component (not shown) is connected to the surface opposite to the surface to which the positive electrode current collector 6 is connected. In the wound negative electrode core exposed portion 5, the negative electrode current collector receiving component 80 is connected to the surface opposite to the surface to which the negative electrode current collector 8 is connected. The positive electrode current collector 6 and the positive electrode current collector receiving part correspond to a positive electrode side current collecting member. The negative electrode current collector 8 and the negative electrode current collector receiving component 80 correspond to a current collecting member on the negative electrode side. The positive electrode current collector receiving component and the negative electrode current collector receiving component 80 are not essential components and can be omitted.

正極集電体６は、正極芯体露出部４に接続される接続部６ａと、封口板２と巻回電極体３の間に配置されるベース部６ｃと、ベース部６ｃから巻回電極体３に向かって延びベース部６ｃと接続部６ａを繋ぐリード部６ｂを有する。接続部６ａは、巻回された正極芯体露出部４上に、直接又は樹脂フィルムを介して配置される。負極集電体８は、負極芯体露出部５に接続される接続部８ａと、封口板２と巻回電極体３の間に配置されるベース部８ｃと、ベース部８ｃから巻回電極体３に向かって延びベース部８ｃと接続部８ａを繋ぐリード部８ｂを有する。接続部８ａは、巻回された負極芯体露出部５上に、直接又は樹脂フィルムを介して配置される。   The positive electrode current collector 6 includes a connecting portion 6a connected to the positive electrode core exposed portion 4, a base portion 6c disposed between the sealing plate 2 and the wound electrode body 3, and a wound electrode body from the base portion 6c. 3 has a lead portion 6b that extends to 3 and connects the base portion 6c and the connecting portion 6a. The connection part 6a is arrange | positioned directly or via the resin film on the positive electrode core exposure part 4 wound. The negative electrode current collector 8 includes a connecting portion 8a connected to the negative electrode core exposed portion 5, a base portion 8c disposed between the sealing plate 2 and the wound electrode body 3, and a wound electrode body from the base portion 8c. 3 has a lead portion 8b that extends to 3 and connects the base portion 8c and the connecting portion 8a. The connection part 8a is arrange | positioned directly or via the resin film on the negative electrode core exposure part 5 wound.

封口板２には角形外装体１内の圧力が所定値以上となった際に破断し、角形外装体１内のガスを角形外装体１外に排出するガス排出弁１５が設けられている。また、封口板２には電解液注液孔が設けられており、電解液注液孔は封止栓１６により封止されている。   The sealing plate 2 is provided with a gas discharge valve 15 that breaks when the pressure in the rectangular exterior body 1 exceeds a predetermined value and exhausts the gas in the rectangular exterior body 1 to the outside of the rectangular exterior body 1. The sealing plate 2 is provided with an electrolyte injection hole, and the electrolyte injection hole is sealed with a sealing plug 16.

次に角形二次電池２０の製造方法について説明する。   Next, a method for manufacturing the rectangular secondary battery 20 will be described.

［正極板の作製］
正極活物質としてのリチウムニッケルコバルトマンガン複合酸化物、結着剤としてのポリフッ化ビニリデン（ＰＶｄＦ）、導電剤としての炭素材料、及び分散媒としてのＮ−メチル−２−ピロリドン（ＮＭＰ）をリチウムニッケルコバルトマンガン複合酸化物：ＰＶ
ｄＦ：炭素材料の質量比が９１：７：２となるように混練し、正極活物質合剤スラリーを作製する。 [Production of positive electrode plate]
Lithium nickel cobalt manganese composite oxide as a positive electrode active material, polyvinylidene fluoride (PVdF) as a binder, a carbon material as a conductive agent, and N-methyl-2-pyrrolidone (NMP) as a dispersion medium Cobalt manganese composite oxide: PV
The mixture is kneaded so that the mass ratio of dF: carbon material is 91: 7: 2 to prepare a positive electrode active material mixture slurry.

正極芯体としての厚さ１５μｍのアルミニウム箔の両面に、正極活物質合剤スラリーをダイコータにより塗布する。その後、正極活物質合剤スラリーを乾燥させ、正極活物質合剤スラリー中のＮＭＰを除去する。これにより正極活物質合剤層が形成される。その後、正極活物質合剤層を圧縮ローラにより所定の充填密度となるように圧縮処理する。そして、所定の形状に切断し正極板４０とする。   A positive electrode active material mixture slurry is applied to both surfaces of a 15 μm-thick aluminum foil as a positive electrode core by a die coater. Thereafter, the positive electrode active material mixture slurry is dried, and NMP in the positive electrode active material mixture slurry is removed. Thereby, a positive electrode active material mixture layer is formed. Thereafter, the positive electrode active material mixture layer is compressed by a compression roller so as to have a predetermined filling density. Then, the positive electrode plate 40 is cut into a predetermined shape.

図３Ａは、正極板４０の平面図である。正極板４０は、長尺状の正極芯体４０ａと、正極芯体４０ａの両面に形成された正極活物質合剤層４０ｂを含む。正極芯体４０ａには、幅方向の端部に、長手方向に沿って両面に正極活物質合剤層４０ｂが形成されていない正極芯体露出部４が設けられている。   FIG. 3A is a plan view of the positive electrode plate 40. The positive electrode plate 40 includes a long positive electrode core body 40a and a positive electrode active material mixture layer 40b formed on both surfaces of the positive electrode core body 40a. The positive electrode core body 40a is provided with a positive electrode core body exposed portion 4 in which the positive electrode active material mixture layer 40b is not formed on both surfaces along the longitudinal direction at the end in the width direction.

図３Ｂに示すように、正極板４０の巻き終わり端部４０ｘの近傍には絶縁シート３０が貼り付けられる。図４に示すように、正極板４０において巻き終わり端部４０ｘの近傍の両面にそれぞれ絶縁シート３０を貼り付けることが好ましい。図４に示すように、正極板４０を両面から一対の絶縁シート３０で挟み込むようにしてもよい。また、一枚の絶縁シート３０を折り返し、正極板４０の両面に貼り付けるようにしてもよい。なお、巻回電極体３とした状態で、少なくとも正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に絶縁シート３０を貼り付ける必要がある。絶縁シート３０は、シート基材３０ａと、シート基材３０ａ上に形成された糊剤層３０ｂからなる絶縁テープであることが好ましい。   As illustrated in FIG. 3B, the insulating sheet 30 is attached in the vicinity of the winding end portion 40 x of the positive electrode plate 40. As shown in FIG. 4, it is preferable that the insulating sheets 30 are attached to both surfaces of the positive electrode plate 40 in the vicinity of the winding end portion 40x. As shown in FIG. 4, the positive electrode plate 40 may be sandwiched between a pair of insulating sheets 30 from both sides. Alternatively, one insulating sheet 30 may be folded and attached to both surfaces of the positive electrode plate 40. In the state where the wound electrode body 3 is formed, it is necessary to affix the insulating sheet 30 at least on the outer peripheral surface in the vicinity of the winding end portion 40x of the positive electrode plate 40. The insulating sheet 30 is preferably an insulating tape including a sheet base 30a and a paste layer 30b formed on the sheet base 30a.

絶縁シート３０は、正極板４０の巻き終わり端部４０ｘから外側に突出するように正極板４０に貼り付けられることが好ましい。正極板４０の長手方向において、絶縁シート３０と正極板４０の重なり部の長さは、例えば１ｍｍ〜２０ｍｍとすることが好ましい。また、正極板４０の長手方向において、絶縁シート３０において正極板４０の巻き終わり端部４０ｘから外側に突出する部分の長さは、例えば１ｍｍ〜２０ｍｍとすることが好ましい。   The insulating sheet 30 is preferably attached to the positive electrode plate 40 so as to protrude outward from the winding end portion 40 x of the positive electrode plate 40. In the longitudinal direction of the positive electrode plate 40, the length of the overlapping portion of the insulating sheet 30 and the positive electrode plate 40 is preferably set to 1 mm to 20 mm, for example. Moreover, in the longitudinal direction of the positive electrode plate 40, the length of the portion of the insulating sheet 30 that protrudes outward from the winding end 40x of the positive electrode plate 40 is preferably 1 mm to 20 mm, for example.

［負極板の作製］
負極活物質としての黒鉛、結着剤としてのスチレンブタジエンゴム（ＳＢＲ）、増粘剤としてのカルボキシメチルセルロース（ＣＭＣ）、及び水を、黒鉛：ＳＢＲ：ＣＭＣの質量比が９９：０．８：０．２となるように混練し、負極活物質合剤スラリーを作製する。 [Production of negative electrode plate]
Graphite as a negative electrode active material, styrene butadiene rubber (SBR) as a binder, carboxymethyl cellulose (CMC) as a thickener, and water, a mass ratio of graphite: SBR: CMC is 99: 0.8: 0. Knead to obtain a negative electrode active material mixture slurry.

負極芯体としての厚さ８μｍの銅箔の両面に、負極活物質合剤スラリーをダイコータにより塗布する。その後、負極活物質合剤スラリーを乾燥させ、負極活物質合剤スラリー中の水を除去する。これにより負極活物質合剤層が形成される。その後、負極活物質合剤層を圧縮ローラにより所定の充填密度となるように圧縮処理する。そして、所定の形状に切断し、負極板５０とする。   A negative electrode active material mixture slurry is applied to both sides of a copper foil having a thickness of 8 μm as a negative electrode core by a die coater. Thereafter, the negative electrode active material mixture slurry is dried, and water in the negative electrode active material mixture slurry is removed. Thereby, a negative electrode active material mixture layer is formed. Thereafter, the negative electrode active material mixture layer is compressed by a compression roller so as to have a predetermined filling density. Then, the negative electrode plate 50 is cut into a predetermined shape.

図５は、負極板５０の平面図である。負極板５０は、長尺状の負極芯体５０ａと、負極芯体５０ａの両面に形成された負極活物質合剤層５０ｂを含む。負極芯体５０ａには、幅方向の端部に、長手方向に沿って両面に負極活物質合剤層５０ｂが形成されていない負極芯体露出部５が設けられている。   FIG. 5 is a plan view of the negative electrode plate 50. The negative electrode plate 50 includes a long negative electrode core body 50a and a negative electrode active material mixture layer 50b formed on both surfaces of the negative electrode core body 50a. The negative electrode core body 50a is provided with a negative electrode core body exposed portion 5 in which the negative electrode active material mixture layer 50b is not formed on both surfaces along the longitudinal direction at the end in the width direction.

［巻回電極体の作製］
上述の方法で作製した長尺状の正極板４０と長尺状の負極板５０を、ポリオレフィン製の長尺状のセパレータ１７を介して巻回し、偏平状にプレス成形する。得られた偏平状の巻回電極体３は、巻回軸方向における一方の端部に巻回された正極芯体露出部４を有し、
他方の端部に巻回された負極芯体露出部５を有する。 [Production of wound electrode body]
The long positive electrode plate 40 and the long negative electrode plate 50 manufactured by the above-described method are wound through a long separator 17 made of polyolefin and press-formed into a flat shape. The obtained flat wound electrode body 3 has a positive electrode core body exposed portion 4 wound around one end in the winding axis direction,
The negative electrode core exposed portion 5 is wound around the other end.

［非水電解液の調整］
エチレンカーボネート（ＥＣ）とエチルメチルカーボネート（ＥＭＣ）とジエチルカーボネート（ＤＥＣ）とを体積比（２５℃、１気圧）で３：３：４となるように混合した混合溶媒を作製した。この混合溶媒に、ＬｉＰＦ６を１ｍｏｌ／Ｌとなるように添加し、さらに非水電解液の総質量に対してその添加量が０．３質量％となるようにビニレンカーボネート（ＶＣ）を添加して非水電解液とした。 [Adjustment of non-aqueous electrolyte]
A mixed solvent was prepared by mixing ethylene carbonate (EC), ethyl methyl carbonate (EMC), and diethyl carbonate (DEC) at a volume ratio (25 ° C., 1 atm) of 3: 3: 4. LiPF 6 was added to this mixed solvent so as to be 1 mol / L, and vinylene carbonate (VC) was added so that the amount added was 0.3% by mass with respect to the total mass of the non-aqueous electrolyte. Thus, a non-aqueous electrolyte was obtained.

［封口板への部品取り付け］
封口板２に設けられた正極端子取り付け孔（図示省略）の周囲の電池外面側に外部側絶縁部材１０を配置する。封口板２に設けられた正極端子取り付け孔（図示省略）の周囲の電池内面側に内部側絶縁部材１１及び正極集電体６のベース部６ｃを配置する。そして、電池外部側から正極端子７を、外部側絶縁部材１０の貫通孔、正極端子取り付け孔、内部側絶縁部材１１の貫通孔及び正極集電体６のベース部６ｃの貫通孔に挿入し、正極端子７の先端部を正極集電体６のベース部６ｃ上にかしめる。これにより、正極端子７及び正極集電体６が封口板２に固定される。なお、正極端子７においてかしめられた部分をベース部６ｃに溶接することが好ましい。 [Attaching parts to the sealing plate]
An external insulating member 10 is disposed on the battery outer surface side around a positive terminal mounting hole (not shown) provided in the sealing plate 2. An inner insulating member 11 and a base portion 6c of the positive electrode current collector 6 are disposed on the battery inner surface side around a positive electrode terminal mounting hole (not shown) provided in the sealing plate 2. Then, the positive electrode terminal 7 is inserted into the through hole of the external insulating member 10, the positive terminal mounting hole, the through hole of the internal insulating member 11, and the through hole of the base portion 6 c of the positive electrode current collector 6 from the outside of the battery, The tip of the positive electrode terminal 7 is caulked on the base portion 6 c of the positive electrode current collector 6. Thereby, the positive electrode terminal 7 and the positive electrode current collector 6 are fixed to the sealing plate 2. In addition, it is preferable to weld the part crimped in the positive electrode terminal 7 to the base part 6c.

封口板２に設けられた負極端子取り付け孔（図示省略）の周囲の電池外面側に外部側絶縁部材１２を配置する。封口板２に設けられた負極端子取り付け孔（図示省略）の周囲の電池内面側に内部側絶縁部材１３及び負極集電体８のベース部８ｃを配置する。そして、電池外部側から負極端子９を、外部側絶縁部材１２の貫通孔、負極端子取り付け孔、内部側絶縁部材１３の貫通孔及び負極集電体８のベース部８ｃの貫通孔に挿入し、負極端子９の先端部を負極集電体８のベース部８ｃ上にかしめる。これにより、負極端子９及び負極集電体８が封口板２に固定される。なお、負極端子９においてかしめられた部分をベース部８ｃに溶接することが好ましい。   An external insulating member 12 is disposed on the battery outer surface side around a negative electrode terminal mounting hole (not shown) provided in the sealing plate 2. The inner insulating member 13 and the base portion 8c of the negative electrode current collector 8 are disposed on the battery inner surface side around the negative electrode terminal mounting hole (not shown) provided in the sealing plate 2. Then, the negative electrode terminal 9 is inserted from the outside of the battery into the through hole of the external insulating member 12, the negative electrode terminal mounting hole, the through hole of the internal insulating member 13, and the through hole of the base portion 8c of the negative electrode current collector 8. The tip of the negative electrode terminal 9 is caulked on the base portion 8 c of the negative electrode current collector 8. As a result, the negative electrode terminal 9 and the negative electrode current collector 8 are fixed to the sealing plate 2. In addition, it is preferable to weld the caulked portion in the negative electrode terminal 9 to the base portion 8c.

［巻回電極体への集電部材の取り付け］
図６は、偏平状の巻回電極体３において正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面を示した図である。図６に示すように、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面に、正極集電体６及び負極集電体８を接続する。接続方法は例えば、抵抗溶接、超音波溶接等により行われる。なお、抵抗溶接を行う場合は、巻回された正極芯体露出部４において正極集電体６が接続された外面と反対側の外面に正極集電体受け部品を接続し、巻回された負極芯体露出部５において負極集電体８が接続された外面と反対側の外面に負極集電体受け部品８０を接続することが好ましい。 [Attaching the current collector to the wound electrode body]
FIG. 6 is a diagram showing a surface on the side where the winding end end portion 40x of the positive electrode plate 40 and the winding end end portion 50x of the negative electrode plate 50 are arranged in the flat wound electrode body 3. As shown in FIG. 6, in the wound electrode body 3, the positive electrode current collector 6 and the negative electrode current collector 6 are disposed on the surface on the side where the winding end end portion 40 x of the positive electrode plate 40 and the winding end end portion 50 x of the negative electrode plate 50 are arranged. The electric body 8 is connected. The connection method is performed by resistance welding, ultrasonic welding, or the like, for example. In addition, when performing resistance welding, the positive electrode current collector receiving component was connected to the outer surface opposite to the outer surface to which the positive electrode current collector 6 was connected in the wound positive electrode core exposed portion 4 and wound. It is preferable to connect the negative electrode current collector receiving component 80 to the outer surface opposite to the outer surface to which the negative electrode current collector 8 is connected in the negative electrode core exposed portion 5.

正極集電体６は、巻回された正極芯体露出部４上に直接又は樹脂フィルムを介して配置される接続部６ａを有する。正極集電体６は接続部６ａにおいて、正極芯体露出部４と溶接接続される。底部１ａに対して垂直な方向において、接続部６ａの底部１ａ側の端部は、巻回電極体３の中心（巻回軸）よりも封口板２側に位置する。なお、接続部６ａと正極芯体露出部４の間に樹脂フィルムが配置される場合は、樹脂フィルムに開口が設けられ、当該開口内で、接続部６ａと正極芯体露出部４が溶接される。したがって、樹脂フィルムは接続部６ａと正極芯体露出部４の間であって、接続部６ａと正極芯体露出部４の溶接部の周囲に配置された状態となる。なお、樹脂フィルムは必須の構成ではなく、接続部６ａを直接正極芯体露出部４上に配置してもよい。   The positive electrode current collector 6 has a connecting portion 6a that is arranged directly or via a resin film on the wound positive electrode core exposed portion 4. The positive electrode current collector 6 is welded to the positive electrode core body exposed portion 4 at the connection portion 6a. In the direction perpendicular to the bottom 1a, the end of the connecting portion 6a on the bottom 1a side is located closer to the sealing plate 2 than the center (winding axis) of the wound electrode body 3. In addition, when a resin film is arrange | positioned between the connection part 6a and the positive electrode core exposure part 4, an opening is provided in the resin film and the connection part 6a and the positive electrode core exposure part 4 are welded in the said opening. The Therefore, the resin film is placed between the connection portion 6 a and the positive electrode core exposed portion 4 and around the welded portion between the connection portion 6 a and the positive electrode core exposed portion 4. The resin film is not an essential configuration, and the connecting portion 6a may be directly disposed on the positive electrode core exposed portion 4.

負極集電体８は、巻回された負極芯体露出部５上に直接又は樹脂フィルムを介して配置される接続部８ａを有する。負極集電体８は接続部８ａにおいて、負極芯体露出部５と溶
接接続される。底部１ａに対して垂直な方向において、接続部８ａの底部１ａ側の端部は、巻回電極体３の中心（巻回軸）よりも封口板２側に位置する。なお、接続部８ａと負極芯体露出部５の間に樹脂フィルムが配置される場合は、樹脂フィルムに開口が設けられ、当該開口内で、接続部８ａと負極芯体露出部５が溶接される。したがって、樹脂フィルムは接続部８ａと負極芯体露出部５の間であって、接続部８ａと負極芯体露出部５の溶接部の周囲に配置された状態となる。なお、樹脂フィルムは必須の構成ではなく、接続部８ａを直接負極芯体露出部５上に配置してもよい。 The negative electrode current collector 8 has a connecting portion 8a that is disposed directly or via a resin film on the wound negative electrode core exposed portion 5. The negative electrode current collector 8 is welded to the negative electrode core exposed portion 5 at the connection portion 8a. In the direction perpendicular to the bottom portion 1a, the end portion on the bottom portion 1a side of the connecting portion 8a is located closer to the sealing plate 2 than the center (winding shaft) of the wound electrode body 3. In addition, when a resin film is arrange | positioned between the connection part 8a and the negative electrode core exposure part 5, an opening is provided in the resin film and the connection part 8a and the negative electrode core exposure part 5 are welded in the said opening. The Therefore, the resin film is disposed between the connection portion 8 a and the negative electrode core exposed portion 5 and around the welded portion between the connection portion 8 a and the negative electrode core exposed portion 5. The resin film is not an essential component, and the connecting portion 8a may be directly disposed on the negative electrode core exposed portion 5.

［角形二次電池の組立て］
集電部材が取り付けられた巻回電極体３を樹脂シート１４で覆い、角形外装体１に挿入する。そして、封口板２と角形外装体１を溶接し、角形外装体１の開口を封口板２により封口する。その後、封口板２に設けられた電解液注液孔から非水電解液を注液し、電解液注液孔を封止栓１６により封止する。これにより、角形二次電池２０が作製される。 [Assembly of prismatic secondary battery]
The spirally wound electrode body 3 to which the current collecting member is attached is covered with a resin sheet 14 and inserted into the rectangular exterior body 1. Then, the sealing plate 2 and the rectangular exterior body 1 are welded, and the opening of the rectangular exterior body 1 is sealed by the sealing plate 2. Thereafter, a nonaqueous electrolytic solution is injected from an electrolytic solution injection hole provided in the sealing plate 2, and the electrolytic solution injection hole is sealed with a sealing plug 16. Thereby, the square secondary battery 20 is produced.

次に、巻回電極体３の詳細、及び負極集電体８及び正極集電体６の接続位置について説明する。   Next, details of the wound electrode body 3 and connection positions of the negative electrode current collector 8 and the positive electrode current collector 6 will be described.

巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘはそれぞれ角形外装体１の底部１ａ側を向くように配置されている。正極板４０の巻き終わり端部４０ｘの外周側に負極板５０が配置される。正極板４０の長さよりも負極板５０の長さが大きいため、正極板４０の巻き終わり端部４０ｘよりも、負極板５０の巻き終わり端部５０ｘが角形外装体１の底部１ａ側に位置する。   In the wound electrode body 3, the winding end end portion 40 x of the positive electrode plate 40 and the winding end end portion 50 x of the negative electrode plate 50 are arranged so as to face the bottom portion 1 a side of the rectangular exterior body 1, respectively. The negative electrode plate 50 is disposed on the outer peripheral side of the winding end portion 40x of the positive electrode plate 40. Since the length of the negative electrode plate 50 is longer than the length of the positive electrode plate 40, the winding end portion 50 x of the negative electrode plate 50 is located closer to the bottom 1 a side of the rectangular exterior body 1 than the winding end portion 40 x of the positive electrode plate 40. .

図６において、点線は正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に貼り付けられた絶縁シート３０の位置を示す。正極板４０の外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘ（正極板４０の長手方向において正極板４０の中央側に位置する端部）は、正極板４０の巻き終わり端部４０ｘよりも封口板２側に位置する。なお、セパレータ１７の巻き終わり端部の図示は省略する。   In FIG. 6, the dotted line indicates the position of the insulating sheet 30 attached to the outer peripheral surface in the vicinity of the winding end portion 40 x of the positive electrode plate 40. The winding start side end 30x (the end located on the center side of the positive electrode plate 40 in the longitudinal direction of the positive electrode plate 40) in the insulating sheet 30 attached to the outer peripheral surface of the positive electrode plate 40 is the winding of the positive electrode plate 40. It is located closer to the sealing plate 2 than the end 40x. The illustration of the winding end portion of the separator 17 is omitted.

図７は、負極集電体８の接続部８ａの近傍の拡大図である。負極集電体８は、負極芯体露出部５上に配置される接続部８ａを有する。リード部８ｂは負極芯体露出部５から離れるともに封口板２側に延びる。接続部８ａは、負極板５０において正極板４０の巻き終わり端部４０ｘよりも外周側に位置する領域における負極芯体露出部５上に配置される。即ち、接続部８ａは、負極板５０において、正極板４０の巻き終わり端部４０ｘよりも外周側に位置する部分の幅方向（巻回軸方向）の端部に位置する負極芯体露出部５上に配置される。なお、接続部８ａは負極芯体露出部５の外面に対して略平行に配置される。また、接続部８ａは負極芯体露出部５の外面を押圧する。   FIG. 7 is an enlarged view of the vicinity of the connection portion 8 a of the negative electrode current collector 8. The negative electrode current collector 8 has a connecting portion 8 a disposed on the negative electrode core exposed portion 5. The lead portion 8b extends away from the negative electrode core exposed portion 5 and toward the sealing plate 2 side. The connecting portion 8a is disposed on the negative electrode core exposed portion 5 in the region located on the outer peripheral side of the negative electrode plate 50 from the winding end portion 40x of the positive electrode plate 40. That is, the connecting portion 8a is the negative electrode core exposed portion 5 located at the end in the width direction (winding axis direction) of the portion of the negative electrode plate 50 that is located on the outer peripheral side of the winding end portion 40x of the positive electrode plate 40. Placed on top. The connecting portion 8a is disposed substantially parallel to the outer surface of the negative electrode core exposed portion 5. The connecting portion 8 a presses the outer surface of the negative electrode core exposed portion 5.

図７に示すよう、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａを、正極板４０の巻き終わり端部４０ｘの外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘの近傍に配置することが好ましい。角形二次電池２０において、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａは、絶縁シート３０における巻き始め側端部３０ｘと重なる位置に配置されている。このような構成であると、負極集電体８の接続部８ａが、正極板４０の巻き終わり端部４０ｘの外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘの近傍に配置されている。したがって、絶縁シート３０における巻き始め側端部３０ｘの外周側に位置する負極板５０が浮き上がることを抑制できる。このため、図８に示すように、正極板４０の巻き終わり端部４０ｘの外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘと、その外周側に配置された負極板５０の間に大きな隙間が生じることを抑制できる。よって、絶縁シート３０における巻き始め側端部３０ｘの外周
側に位置する負極板５０上にリチウムが析出することを抑制できる。 As shown in FIG. 7, the connecting portion 8 a of the negative electrode current collector 8 is attached to the outer peripheral side surface of the winding end portion 40 x of the positive electrode plate 40 in the direction perpendicular to the bottom portion 1 a of the rectangular exterior body 1. The insulating sheet 30 is preferably disposed in the vicinity of the winding start side end 30x. In the prismatic secondary battery 20, the connecting portion 8 a of the negative electrode current collector 8 is disposed at a position overlapping the winding start side end portion 30 x in the insulating sheet 30 in the direction perpendicular to the bottom portion 1 a of the prismatic exterior body 1. Yes. With such a configuration, the connection portion 8a of the negative electrode current collector 8 is in the vicinity of the winding start side end portion 30x in the insulating sheet 30 attached to the outer peripheral side surface of the winding end end portion 40x of the positive electrode plate 40. Is arranged. Therefore, the negative electrode plate 50 located on the outer peripheral side of the winding start side end 30x in the insulating sheet 30 can be suppressed from floating. For this reason, as shown in FIG. 8, the winding start side end 30x in the insulating sheet 30 attached to the outer peripheral side surface of the winding end end 40x of the positive electrode plate 40, and the negative electrode plate disposed on the outer peripheral side thereof It is possible to suppress a large gap between 50. Therefore, it can suppress that lithium precipitates on the negative electrode plate 50 located in the outer peripheral side of the winding start side edge part 30x in the insulating sheet 30. FIG.

図９は、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａが、正極板４０の巻き終わり端部４０ｘの外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘから大きく離れた位置に配置された場合の正極板４０の巻き終わり端部４０ｘ近傍の巻回電極体３の拡大断面図である。角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａが、正極板４０の巻き終わり端部４０ｘの外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘから大きく離れた位置に配置された場合、絶縁シート３０における巻き始め側端部３０ｘの外周側に配置された負極板５０が浮き上がり易くなる。そして、図９に示すように、正極板４０と負極板５０の間に大きな隙間７０が生じる虞がある。そして、正極板４０と負極板５０の間に大きな隙間７０が生じると、正極板４０と負極板５０がセパレータ１７を介して隙間無く対向する部分における隙間７０の近傍Ｐにリチウムが析出する虞がある。   FIG. 9 shows the insulation in which the connecting portion 8a of the negative electrode current collector 8 is attached to the outer peripheral surface of the winding end portion 40x of the positive electrode plate 40 in the direction perpendicular to the bottom portion 1a of the rectangular outer casing 1. FIG. 3 is an enlarged cross-sectional view of a wound electrode body 3 in the vicinity of a winding end end portion 40x of a positive electrode plate 40 when the sheet 30 is disposed at a position far away from a winding start side end portion 30x. In the direction perpendicular to the bottom 1a of the rectangular outer casing 1, the connecting portion 8a of the negative electrode current collector 8 is wound on the insulating sheet 30 attached to the outer peripheral surface of the winding end portion 40x of the positive electrode plate 40. When arranged at a position far away from the start side end 30x, the negative electrode plate 50 arranged on the outer peripheral side of the winding start side end 30x in the insulating sheet 30 is likely to float. As shown in FIG. 9, a large gap 70 may be generated between the positive electrode plate 40 and the negative electrode plate 50. When a large gap 70 is generated between the positive electrode plate 40 and the negative electrode plate 50, lithium may be deposited in the vicinity P of the gap 70 in a portion where the positive electrode plate 40 and the negative electrode plate 50 face each other with no gap through the separator 17. is there.

これに対して、実施形態に係る角形二次電池２０においては、絶縁シート３０における巻き始め側端部３０ｘの外周側に配置される負極板５０が浮き上がることを抑制できる。よって、絶縁シート３０における巻き始め側端部３０ｘの外周側に位置する負極板５０上にリチウムが析出することを抑制できる。   On the other hand, in the square secondary battery 20 according to the embodiment, the negative electrode plate 50 disposed on the outer peripheral side of the winding start side end portion 30x in the insulating sheet 30 can be suppressed. Therefore, it can suppress that lithium precipitates on the negative electrode plate 50 located in the outer peripheral side of the winding start side edge part 30x in the insulating sheet 30. FIG.

上述のように、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａを、正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘの近傍に配置することが好ましい。具体的には、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さを長さＬ（ｍｍ）とした場合、角形外装体１の底部１ａに対して垂直な方向における負極集電体８の接続部８ａと正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘの距離を距離Ｄ１（ｍｍ）とした場合、距離Ｄ１（ｍｍ）が長さＬ（ｍｍ）に対して１０％以下であることが好ましく、５％以下であることがより好ましい。このような構成であると、絶縁シート３０における巻き始め側端部３０ｘの外周側に配置される負極板５０が浮き上がることを抑制できる。なお、距離Ｄ１（ｍｍ）は、６ｍｍ以下であることが好ましく、４ｍｍ以下であることがより好ましい。   As described above, the connecting portion 8a of the negative electrode current collector 8 is attached to the outer peripheral surface in the vicinity of the winding end portion 40x of the positive electrode plate 40 in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1. The insulating sheet 30 is preferably disposed in the vicinity of the winding start side end 30x. Specifically, when the length of the spirally wound electrode body 3 in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1 is a length L (mm), the length is perpendicular to the bottom portion 1a of the rectangular exterior body 1. The distance between the connecting portion 8a of the negative electrode current collector 8 and the winding end end portion 30x of the insulating sheet 30 attached to the outer peripheral surface in the vicinity of the winding end portion 40x of the positive electrode plate 40 in the direction is a distance D1 (mm ), The distance D1 (mm) is preferably 10% or less, more preferably 5% or less with respect to the length L (mm). With such a configuration, it is possible to suppress the negative electrode plate 50 disposed on the outer peripheral side of the winding start side end portion 30x in the insulating sheet 30 from being lifted. The distance D1 (mm) is preferably 6 mm or less, and more preferably 4 mm or less.

図１０（ａ）〜図１０（ｃ）は、負極集電体８の接続部８ａの位置を変えた例を示す図である。   FIG. 10A to FIG. 10C are diagrams showing an example in which the position of the connecting portion 8a of the negative electrode current collector 8 is changed.

図１０（ａ）は、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａの底部１ａ側の端部８ｘが、絶縁シート３０における巻き始め側端部３０ｘよりも封口板２側に位置する例を示す。
図１０（ｂ）は、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａの底部１ａ側の端部８ｘと、絶縁シート３０における巻き始め側端部３０ｘが揃った例である。この場合、角形外装体１の底部１ａに対して垂直な方向において、絶縁シート３０における巻き始め側端部３０ｘと負極集電体８の接続部８ａの間の距離Ｄ１は０ｍｍである。
図１０（ｃ）は、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａの封口板２側の端部８ｙが、絶縁シート３０における巻き始め側端部３０ｘよりも角形外装体１の底部１ａ側に位置する例である。 FIG. 10A shows that the end 8x on the bottom 1a side of the connecting portion 8a of the negative electrode current collector 8 is the winding start side end of the insulating sheet 30 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. The example located in the sealing board 2 side rather than 30x is shown.
FIG. 10B shows the end 8x on the bottom 1a side of the connecting portion 8a of the negative electrode current collector 8 and the winding start side end in the insulating sheet 30 in a direction perpendicular to the bottom 1a of the rectangular exterior body 1. 30x is an example. In this case, the distance D1 between the winding start side end 30x of the insulating sheet 30 and the connecting portion 8a of the negative electrode current collector 8 is 0 mm in the direction perpendicular to the bottom 1a of the rectangular exterior body 1.
FIG. 10 (c) shows that the end 8 y on the sealing plate 2 side of the connecting portion 8 a of the negative electrode current collector 8 is the winding start side end in the insulating sheet 30 in the direction perpendicular to the bottom 1 a of the rectangular exterior body 1. This is an example of being positioned closer to the bottom 1a side of the rectangular exterior body 1 than the portion 30x.

図１０（ａ）及び図１０（ｃ）に示す形態では、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａと絶縁シート３０における巻き始め側端部３０ｘが離間している。このような場合は、角形外装体１の底部１ａに対して垂直な方向に
おける巻回電極体３の長さＬ（ｍｍ）に対して、角形外装体１の底部１ａに対して垂直な方向における負極集電体８の接続部８ａと絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ１（ｍｍ）は、１０％以下であることが好ましく、５％以下であることがより好ましい。このような構成であると、絶縁シート３０における巻き始め側端部３０ｘの外周側に配置される負極板５０が浮き上がることを抑制できる。なお、距離Ｄ１（ｍｍ）は、６ｍｍ以下であることが好ましく、４ｍｍ以下であることがより好ましい。また、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａと負極芯体露出部５が接合された接合部と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ（ｍｍ）を、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）に対して１０％以下とすることが好ましく、５％以下とすることがより好ましい。 10 (a) and 10 (c), in the direction perpendicular to the bottom portion 1a of the rectangular outer package 1, the winding start side end portion of the connecting portion 8a of the negative electrode current collector 8 and the insulating sheet 30 are provided. 30x are separated. In such a case, the length L (mm) of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 is in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. The distance D1 (mm) between the connecting portion 8a of the negative electrode current collector 8 and the winding start side end portion 30x in the insulating sheet 30 is preferably 10% or less, and more preferably 5% or less. With such a configuration, it is possible to suppress the negative electrode plate 50 disposed on the outer peripheral side of the winding start side end portion 30x in the insulating sheet 30 from being lifted. The distance D1 (mm) is preferably 6 mm or less, and more preferably 4 mm or less. In addition, in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1, the winding start side end portion 30x of the joining portion where the connecting portion 8a of the negative electrode current collector 8 and the negative electrode core body exposed portion 5 are joined and the insulating sheet 30. The distance D (mm) is preferably 10% or less with respect to the length L (mm) of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 and 5% or less. More preferably.

図１１（ａ）〜図１１（ｃ）は、角形二次電池２０における正極集電体６の接続部６ａの近傍の拡大図である。角形外装体１の底部１ａに対して垂直な方向において、正極集電体６の接続部６ａは、絶縁シート３０における巻き始め側端部３０ｘの近傍に接続されていることが好ましい。   FIG. 11A to FIG. 11C are enlarged views in the vicinity of the connection portion 6 a of the positive electrode current collector 6 in the square secondary battery 20. In a direction perpendicular to the bottom portion 1 a of the rectangular exterior body 1, the connection portion 6 a of the positive electrode current collector 6 is preferably connected to the vicinity of the winding start side end portion 30 x of the insulating sheet 30.

図１１（ａ）は、角形外装体１の底部１ａに対して垂直な方向において、正極集電体６の接続部６ａが絶縁シート３０における巻き始め側端部３０ｘと重なる位置に配置された例を示す。
図１１（ｂ）は、角形外装体１の底部１ａに対して垂直な方向において、正極集電体６の接続部６ａが絶縁シート３０における巻き始め側端部３０ｘよりも封口板２側に配置されている例を示す。
図１１（ｃ）は、角形外装体１の底部１ａに対して垂直な方向において、正極集電体６の接続部６ａが絶縁シート３０における巻き始め側端部３０ｘよりも角形外装体１の底部１ａ側に配置された例を示す。 FIG. 11A shows an example in which the connecting portion 6a of the positive electrode current collector 6 is disposed at a position overlapping the winding start side end portion 30x in the insulating sheet 30 in a direction perpendicular to the bottom portion 1a of the rectangular exterior body 1. Indicates.
In FIG. 11B, the connecting portion 6 a of the positive electrode current collector 6 is disposed closer to the sealing plate 2 than the winding start side end portion 30 x of the insulating sheet 30 in the direction perpendicular to the bottom portion 1 a of the rectangular exterior body 1. An example is shown.
FIG. 11C shows the bottom portion of the rectangular exterior body 1 in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1 where the connecting portion 6a of the positive electrode current collector 6 is more than the winding start side end portion 30x of the insulating sheet 30. The example arrange | positioned at the 1a side is shown.

図１１（ｂ）及び図１１（ｃ）に示す形態では、角形外装体１の底部１ａに対して垂直な方向において、正極集電体６の接続部６ａと絶縁シート３０における巻き始め側端部３０ｘが離間している。このような場合は、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）に対して、角形外装体１の底部１ａに対して垂直な方向における正極集電体６の接続部６ａと絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ２（ｍｍ）は、１０％以下であることが好ましく、５％以下であることがより好ましい。このような、構成であると、正極板４０の巻き終わり端部４０ｘが浮き上がることを確実に抑制できる。なお、距離Ｄ２（ｍｍ）は、６ｍｍ以下であることが好ましく、４ｍｍ以下であることがより好ましい。また、角形外装体１の底部１ａに対して垂直な方向において、正極集電体６の接続部６ａと正極芯体露出部４が接合された接合部と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ（ｍｍ）を、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）に対して１０％以下とすることが好ましく、５％以下とすることが好ましい。   11 (b) and 11 (c), in the direction perpendicular to the bottom 1a of the rectangular exterior body 1, the winding start side end portion of the connecting portion 6a of the positive electrode current collector 6 and the insulating sheet 30 is provided. 30x are separated. In such a case, the length L (mm) of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 is in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. The distance D2 (mm) between the connecting portion 6a of the positive electrode current collector 6 and the winding start side end portion 30x in the insulating sheet 30 is preferably 10% or less, and more preferably 5% or less. With such a configuration, it is possible to reliably suppress the winding end 40x of the positive electrode plate 40 from floating. The distance D2 (mm) is preferably 6 mm or less, and more preferably 4 mm or less. In addition, in the direction perpendicular to the bottom 1a of the rectangular exterior body 1, the winding start side end portion 30x of the joint portion where the connection portion 6a of the positive electrode current collector 6 and the positive electrode core exposed portion 4 are joined, and the insulating sheet 30. The distance D (mm) is preferably 10% or less with respect to the length L (mm) of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 and 5% or less. It is preferable to do.

［実施例１］
上述の実施形態に記載の方法で角形二次電池を作製し、実施例１の角形二次電池とした。実施例１の角形二次電池においては、図７に示すように、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａを、正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘと重なる位置としている。即ち、実施例１の角形二次電池においては、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａと絶縁シート３０における巻き始め側端部３０ｘの間の距離Ｄ１は０ｍｍである。
なお、実施例１の角形二次電池において、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）は５５ｍｍである。また、角形外装体１の底部１
ａに対して平行な方向における巻回電極体３の長さは、１３４ｍｍであり、巻回電極体３の厚みは１１ｍｍである。 [Example 1]
A prismatic secondary battery was produced by the method described in the above embodiment, and the prismatic secondary battery of Example 1 was obtained. In the rectangular secondary battery of Example 1, as shown in FIG. 7, the connecting portion 8 a of the negative electrode current collector 8 is connected to the end of the positive electrode plate 40 in the direction perpendicular to the bottom portion 1 a of the rectangular outer package 1. It is set as the position which overlaps with the winding start side edge part 30x in the insulating sheet 30 affixed on the outer peripheral surface of the vicinity of the edge part 40x. That is, in the prismatic secondary battery of Example 1, between the connection portion 8a of the negative electrode current collector 8 and the winding start side end portion 30x in the insulating sheet 30 in the direction perpendicular to the bottom portion 1a of the rectangular sheath 1. The distance D1 is 0 mm.
In the prismatic secondary battery of Example 1, the length L (mm) of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the prismatic exterior body 1 is 55 mm. Further, the bottom 1 of the rectangular outer casing 1
The length of the wound electrode body 3 in the direction parallel to a is 134 mm, and the thickness of the wound electrode body 3 is 11 mm.

［比較例１］
負極集電体８の接続部８ａが配置される位置が異なる以外は実施例１の角形二次電池と同様の構成を有する比較例１の角形二次電池を作製した。比較例１の角形二次電池では、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａと絶縁シート３０における巻き始め側端部３０ｘとの距離Ｄ１を８ｍｍとした。なお、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬは５５ｍｍである。したがって、Ｄ１／Ｌ＝０．１５である。 [Comparative Example 1]
A prismatic secondary battery of Comparative Example 1 having the same configuration as that of the prismatic secondary battery of Example 1 was produced except that the position where the connecting portion 8a of the negative electrode current collector 8 was arranged was different. In the rectangular secondary battery of Comparative Example 1, the distance D1 between the connection portion 8a of the negative electrode current collector 8 and the winding start side end portion 30x in the insulating sheet 30 in the direction perpendicular to the bottom portion 1a of the rectangular outer package 1 is set. It was 8 mm. Note that the length L of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 is 55 mm. Therefore, D1 / L = 0.15.

実施例１及び比較例１の角形二次電池について、以下の試験を行った。
［試験］
２５℃の条件下で以下（１）〜（１０）を行った。
（１）角形二次電池を４．０Ａの定電流で３．７Ｖまで充電し、その後３．７Ｖの定電圧で充電を行い、角形二次電池の充電深度（ＳＯＣ）を５０％とした。
（２）３０分間休止した。
（３）８５Ａで１００秒間充電を行った。
（４）１０分間休止した。
（５）８５Ａで１００秒間放電を行った。
（６）１０分間休止した。
（７）（３）〜（６）を１サイクルとし、５００サイクル行った。
（８）２時間休止した。
（９）４．０Ａで２．５Ｖまで放電した。
（１０）１０分間休止した。 The following tests were performed on the prismatic secondary batteries of Example 1 and Comparative Example 1.
[test]
The following (1) to (10) were performed under the condition of 25 ° C.
(1) The prismatic secondary battery was charged to 3.7 V with a constant current of 4.0 A, and then charged with a constant voltage of 3.7 V, and the charging depth (SOC) of the prismatic secondary battery was set to 50%.
(2) Paused for 30 minutes.
(3) The battery was charged at 85A for 100 seconds.
(4) Paused for 10 minutes.
(5) Discharge was performed at 85 A for 100 seconds.
(6) Paused for 10 minutes.
(7) (3) to (6) were set as one cycle, and 500 cycles were performed.
(8) Paused for 2 hours.
(9) The battery was discharged to 2.5 V at 4.0 A.
(10) Paused for 10 minutes.

［評価］
試験後の角形二次電池を解体し、正極板４０の巻き終わり端部４０ｘの近傍の外周側に位置する負極板５０上のリチウム析出の有無について目視で確認した。 [Evaluation]
The prismatic secondary battery after the test was disassembled, and the presence or absence of lithium deposition on the negative electrode plate 50 located on the outer peripheral side in the vicinity of the winding end 40x of the positive electrode plate 40 was visually confirmed.

［結果］
実施例１の角形二次電池では、正極板４０の巻き終わり端部４０ｘの外周側に位置する負極板５０上のリチウム析出は確認できなかった。比較例１の角形二次電池では、正極板４０の巻き終わり端部４０ｘの外周側に位置する負極板５０上のリチウム析出が確認された。このことから、角形外装体１の底部１ａに対して垂直な方向において、負極集電体８の接続部８ａを、正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘの近傍に配置することにより、正極板４０の巻き終わり端部４０ｘの外周に位置する負極板５０上へのリチウム析出を抑制できることが分かる。 [result]
In the prismatic secondary battery of Example 1, lithium deposition on the negative electrode plate 50 located on the outer peripheral side of the winding end 40x of the positive electrode plate 40 could not be confirmed. In the prismatic secondary battery of Comparative Example 1, lithium deposition on the negative electrode plate 50 located on the outer peripheral side of the winding end 40x of the positive electrode plate 40 was confirmed. Therefore, the connecting portion 8a of the negative electrode current collector 8 is attached to the outer peripheral surface in the vicinity of the winding end portion 40x of the positive electrode plate 40 in the direction perpendicular to the bottom portion 1a of the rectangular outer casing 1. It can be seen that by arranging the insulating sheet 30 in the vicinity of the winding start side end portion 30x, lithium deposition on the negative electrode plate 50 located on the outer periphery of the winding end end portion 40x of the positive electrode plate 40 can be suppressed.

［変形例１］
上述の角形二次電池２０においては、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面に、正極集電体６及び負極集電体８が接続される例を示した。変形例１においては、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置されない側の面に正極集電体６及び負極集電体８が接続される。そして、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面に正極集電体受け部品６０及び負極集電体受け部品８０が接続される。なお、正極集電体６と正極集電体受け部品６０により巻回された正極芯体露出部４が挟まれた状態となっている。また、負極集電体８と負極集電体受け部品８０により巻回された負極芯
体露出部５が挟まれた状態となっている。底部１ａに対して垂直な方向において、正極集電体受け部品６０の底部１ａ側の端部は、巻回電極体３の中心（巻回軸）よりも封口板２側に位置する。また、底部１ａに対して垂直な方向において、負極集電体受け部品８０の底部１ａ側の端部８０ｘは、巻回電極体３の中心（巻回軸）よりも封口板２側に位置する。 [Modification 1]
In the above-described prismatic secondary battery 20, the positive electrode current collector 6 is disposed on the surface of the wound electrode body 3 on the side where the winding end end portion 40 x of the positive electrode plate 40 and the winding end end portion 50 x of the negative electrode plate 50 are disposed. An example in which the negative electrode current collector 8 is connected is shown. In the first modification, the positive electrode current collector 6 and the negative electrode current collector 8 are disposed on the surface of the wound electrode body 3 on the side where the winding end end portion 40x of the positive electrode plate 40 and the winding end end portion 50x of the negative electrode plate 50 are not disposed. Is connected. In the wound electrode body 3, the positive electrode current collector receiving component 60 and the negative electrode current collector receiving component are disposed on the surface on the side where the winding end portion 40 x of the positive electrode plate 40 and the winding end portion 50 x of the negative electrode plate 50 are disposed. 80 is connected. The positive electrode core exposed portion 4 wound by the positive electrode current collector 6 and the positive electrode current collector receiving component 60 is sandwiched. Further, the negative electrode core exposed portion 5 wound by the negative electrode current collector 8 and the negative electrode current collector receiving component 80 is sandwiched. In the direction perpendicular to the bottom 1a, the end on the bottom 1a side of the positive electrode current collector receiving component 60 is located closer to the sealing plate 2 than the center (winding axis) of the wound electrode body 3. Further, in the direction perpendicular to the bottom portion 1a, the end portion 80x on the bottom portion 1a side of the negative electrode current collector receiving component 80 is located closer to the sealing plate 2 than the center (winding axis) of the wound electrode body 3. .

図１２は、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面であり、正極集電体受け部品６０及び負極集電体受け部品８０が接続される側の面を示す図である。正極板４０の巻き終わり端部４０ｘの外周側に負極板５０が配置されている。そして、正極板４０の巻き終わり端部４０ｘよりも負極板５０の巻き終わり端部５０ｘが底部１ａ側に位置する。また、正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に貼り付けられる絶縁シート３０における巻き始め側端部３０ｘは、正極板４０の巻き終わり端部４０ｘよりも封口板２側に位置する。なお、セパレータ１７の巻き終わり端部の図示は省略する。   FIG. 12 is a surface of the wound electrode body 3 on the side where the winding end portion 40x of the positive electrode plate 40 and the winding end portion 50x of the negative electrode plate 50 are disposed. It is a figure which shows the surface by the side to which the electric body receiving component 80 is connected. The negative electrode plate 50 is disposed on the outer peripheral side of the winding end portion 40x of the positive electrode plate 40. And the winding end part 50x of the negative electrode plate 50 is located in the bottom part 1a side rather than the winding end part 40x of the positive electrode plate 40. FIG. Further, the winding start side end portion 30x of the insulating sheet 30 attached to the outer peripheral surface in the vicinity of the winding end end portion 40x of the positive electrode plate 40 is closer to the sealing plate 2 than the winding end end portion 40x of the positive electrode plate 40. To position. The illustration of the winding end portion of the separator 17 is omitted.

角形外装体１の底部１ａに対して垂直な方向において、負極集電体受け部品８０の全体が巻回された負極芯体露出部５上に配置されている。ここで、負極集電体受け部品８０が集電部材の接続部に相当する。なお、負極芯体露出部５と負極集電体受け部品８０の間に樹脂フィルムを介在させることもできる。この場合、樹脂フィルムに開口を設け、当該開口内において負極芯体露出部５と負極集電体受け部品８０を溶接接続する。   In the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1, the entire negative electrode current collector receiving component 80 is disposed on the negative electrode core exposed portion 5 wound. Here, the negative electrode current collector receiving component 80 corresponds to a connecting portion of the current collecting member. A resin film may be interposed between the negative electrode core exposed portion 5 and the negative electrode current collector receiving component 80. In this case, an opening is provided in the resin film, and the negative electrode core exposed portion 5 and the negative electrode current collector receiving component 80 are welded and connected in the opening.

図１３（ａ）〜図１３（ｄ）は、変形例１における負極集電体受け部品８０の近傍の拡大図である。   FIGS. 13A to 13D are enlarged views in the vicinity of the negative electrode current collector receiving component 80 in the first modification.

図１３（ａ）は、角形外装体１の底部１ａに対して垂直な方向において、負極集電体受け部品８０が絶縁シート３０における巻き始め側端部３０ｘよりも封口板２側に位置する例を示す。
図１３（ｂ）は、角形外装体１の底部１ａに対して垂直な方向において、絶縁シート３０における巻き始め側端部３０ｘと負極集電体受け部品８０の底部１ａ側の端部の位置を揃えた例を示す。
図１３（ｃ）は、角形外装体１の底部１ａに対して垂直な方向において、絶縁シート３０における巻き始め側端部３０ｘが、負極集電体受け部品８０と重なる例を示す。
図１３（ｄ）は、角形外装体１の底部１ａに対して垂直な方向において、負極集電体受け部品８０が絶縁シート３０における巻き始め側端部３０ｘよりも底部１ａ側に位置する例である。 FIG. 13A shows an example in which the negative electrode current collector receiving component 80 is positioned closer to the sealing plate 2 than the winding start side end 30x of the insulating sheet 30 in the direction perpendicular to the bottom 1a of the rectangular outer package 1. Indicates.
FIG. 13B shows the position of the winding start side end 30x in the insulating sheet 30 and the end on the bottom 1a side of the negative electrode current collector receiving component 80 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. Here are some examples.
FIG. 13C shows an example in which the winding start side end 30x of the insulating sheet 30 overlaps with the negative electrode current collector receiving component 80 in a direction perpendicular to the bottom 1a of the rectangular exterior body 1.
FIG. 13D shows an example in which the negative electrode current collector receiving component 80 is positioned on the bottom 1a side of the winding start side end 30x of the insulating sheet 30 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. is there.

角形外装体１の底部１ａに対して垂直な方向において、負極集電体受け部品８０を、絶縁シート３０における巻き始め側端部３０ｘの近傍に配置することが好ましい。このような構成であると、絶縁シート３０における巻き始め側端部３０ｘの外周側に配置される負極板５０が浮き上がることを抑制できる。   The negative electrode current collector receiving component 80 is preferably disposed in the vicinity of the winding start side end portion 30x of the insulating sheet 30 in a direction perpendicular to the bottom portion 1a of the rectangular exterior body 1. With such a configuration, it is possible to suppress the negative electrode plate 50 disposed on the outer peripheral side of the winding start side end portion 30x in the insulating sheet 30 from being lifted.

図１３（ａ）及び図１３（ｄ）に示す形態では、角形外装体１の底部１ａに対して垂直な方向において、負極集電体受け部品８０と絶縁シート３０における巻き始め側端部３０ｘが離間している。このような場合は、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）に対して、角形外装体１の底部１ａに対して垂直な方向における負極集電体受け部品８０と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ３（ｍｍ）は、１０％以下であることが好ましく、５％以下であることがより好ましい。なお、距離Ｄ３（ｍｍ）は、６ｍｍ以下であることが好ましく、４ｍｍ以下であることがより好ましい。   In the form shown in FIGS. 13A and 13D, the winding start side end 30x of the negative electrode current collector receiving part 80 and the insulating sheet 30 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 is It is separated. In such a case, the length L (mm) of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 is in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. The distance D3 (mm) between the negative electrode current collector receiving part 80 and the winding start side end 30x in the insulating sheet 30 is preferably 10% or less, and more preferably 5% or less. The distance D3 (mm) is preferably 6 mm or less, and more preferably 4 mm or less.

なお、図１３（ｂ）及び図１３（ｃ）に示す形態においては、角形外装体１の底部１ａに対して垂直な方向における負極集電体受け部品８０と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ３（ｍｍ）は０ｍｍである。   13B and 13C, the winding start side end portion of the negative electrode current collector receiving component 80 and the insulating sheet 30 in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1 is used. The distance D3 (mm) of 30x is 0 mm.

また、負極集電体受け部品８０と負極芯体露出部５が接合された接合部と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ（ｍｍ）を、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）に対して１０％以下とすることが好ましく、５％以下とすることがより好ましい。   Further, the distance D (mm) between the joint portion where the negative electrode current collector receiving component 80 and the negative electrode core exposed portion 5 are joined and the winding start side end portion 30x in the insulating sheet 30 is defined with respect to the bottom portion 1a of the rectangular exterior body 1. And 10% or less, more preferably 5% or less, with respect to the length L (mm) of the wound electrode body 3 in the vertical direction.

なお、角形外装体１の底部１ａに対して垂直な方向における正極集電体受け部品６０と絶縁シート３０における巻き始め側端部３０ｘの距離は、長さＬ（ｍｍ）に対して１０％以下であることが好ましく、５％であることがより好ましい。   In addition, the distance between the positive electrode current collector receiving component 60 and the winding start side end 30x in the insulating sheet 30 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 is 10% or less with respect to the length L (mm). Preferably, it is 5%.

角形外装体１の底部１ａに対して垂直な方向において、正極集電体受け部品６０と正極芯体露出部４が接合された接合部と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ（ｍｍ）を、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）に対して１０％以下とすることが好ましく、５％以下とすることがより好ましい。   In a direction perpendicular to the bottom portion 1a of the rectangular exterior body 1, a distance D () between the joint portion where the positive current collector receiving part 60 and the positive electrode core exposed portion 4 are joined and the winding start side end portion 30x in the insulating sheet 30 ( mm) is preferably 10% or less with respect to the length L (mm) of the wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1, and more preferably 5% or less. preferable.

［変形例２］
上述の実施形態に係る角形二次電池２０においては、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面に、正極集電体６及び負極集電体８が接続される例を示した。変形例２においては、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置されない側の面に正極集電体６及び負極集電体８が接続され、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される面には、集電部材は接続されていない。正極集電体受け部品６０及び負極集電体受け部品８０を備えていない。 [Modification 2]
In the prismatic secondary battery 20 according to the above-described embodiment, in the wound electrode body 3, the positive electrode is disposed on the surface on the side where the winding end end 40 x of the positive electrode plate 40 and the winding end end 50 x of the negative electrode plate 50 are disposed. An example in which the current collector 6 and the negative electrode current collector 8 are connected is shown. In the modified example 2, in the wound electrode body 3, the positive electrode current collector 6 and the negative electrode current collector 8 are disposed on the surface on which the winding end end portion 40 x of the positive electrode plate 40 and the winding end end portion 50 x of the negative electrode plate 50 are not disposed. Are connected, and the current collecting member is not connected to the surface where the winding end portion 40x of the positive electrode plate 40 and the winding end portion 50x of the negative electrode plate 50 are disposed. The positive electrode current collector receiving component 60 and the negative electrode current collector receiving component 80 are not provided.

図１４は、巻回電極体３において、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面である。正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが配置される側の面には、正極集電体６、負極集電体８、正極集電体受け部品６０及び負極集電体受け部品８０が配置されず、正極芯体同士の接合部９０及び負極芯体同士の接合部９１が露出する。接合部９０及び接合部９１は抵抗溶接、超音波溶接、レーザ溶接等により形成される。底部１ａに対して垂直な方向において、接合部９０の底部１ａ側の端部は、巻回電極体３の中心（巻回軸）よりも封口板２側に位置する。また、底部１ａに対して垂直な方向において、接合部９１の底部１ａ側の端部９１ｘは、巻回電極体３の中心（巻回軸）よりも封口板２側に位置する。   FIG. 14 is a surface on the side where the winding end 40x of the positive electrode plate 40 and the winding end 50x of the negative electrode plate 50 are arranged in the wound electrode body 3. On the surface on the side where the winding end portion 40x of the positive electrode plate 40 and the winding end portion 50x of the negative electrode plate 50 are disposed, the positive electrode current collector 6, the negative electrode current collector 8, the positive electrode current collector receiving component 60, and the negative electrode The current collector receiving component 80 is not disposed, and the joint portion 90 between the positive electrode cores and the joint portion 91 between the negative electrode cores are exposed. The joint 90 and the joint 91 are formed by resistance welding, ultrasonic welding, laser welding, or the like. In the direction perpendicular to the bottom portion 1 a, the end portion on the bottom portion 1 a side of the joint portion 90 is located closer to the sealing plate 2 than the center (winding shaft) of the wound electrode body 3. Further, in the direction perpendicular to the bottom portion 1 a, the end portion 91 x on the bottom portion 1 a side of the joint portion 91 is located closer to the sealing plate 2 than the center (winding axis) of the wound electrode body 3.

正極板４０の巻き終わり端部４０ｘの外周側に負極板５０が配置されている。そして、正極板４０の巻き終わり端部４０ｘよりも負極板５０の巻き終わり端部５０ｘが底部１ａ側に位置する。正極板４０の巻き終わり端部４０ｘの近傍の外周側の面に貼り付けられた絶縁シート３０における巻き始め側端部３０ｘは、正極板４０の巻き終わり端部４０ｘよりも封口板２側に位置する。なお、セパレータ１７の巻き終わり端部の図示は省略する。   The negative electrode plate 50 is disposed on the outer peripheral side of the winding end portion 40x of the positive electrode plate 40. And the winding end part 50x of the negative electrode plate 50 is located in the bottom part 1a side rather than the winding end part 40x of the positive electrode plate 40. FIG. The winding start side end portion 30x of the insulating sheet 30 attached to the outer peripheral side surface in the vicinity of the winding end end portion 40x of the positive electrode plate 40 is positioned closer to the sealing plate 2 than the winding end end portion 40x of the positive electrode plate 40. To do. The illustration of the winding end portion of the separator 17 is omitted.

図１５（ａ）〜図１５（ｄ）は、変形例２における接合部９１の拡大図である。   FIG. 15A to FIG. 15D are enlarged views of the joint portion 91 in the second modification.

図１５（ａ）は、角形外装体１の底部１ａに対して垂直な方向において、接合部９１が、絶縁シート３０における巻き始め側端部３０ｘよりも封口板２側に位置する例を示す。
図１５（ｂ）は、角形外装体１の底部１ａに対して垂直な方向において、接合部９１の
底部１ａ側の端部を、絶縁シート３０における巻き始め側端部３０ｘと揃えた例を示す。
図１５（ｃ）は、角形外装体１の底部１ａに対して垂直な方向において、接合部９１が絶縁シート３０における巻き始め側端部３０ｘと重なる位置に配置された例を示す図である。
図１５（ｄ）は、角形外装体１の底部１ａに対して垂直な方向において、接合部９１は、絶縁シート３０における巻き始め側端部３０ｘよりも角形外装体１の底部１ａ側に位置する例を示す。 FIG. 15A shows an example in which the joining portion 91 is located closer to the sealing plate 2 side than the winding start side end portion 30x in the insulating sheet 30 in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1.
FIG. 15B shows an example in which the end portion on the bottom portion 1 a side of the joint portion 91 is aligned with the winding start side end portion 30 x in the insulating sheet 30 in a direction perpendicular to the bottom portion 1 a of the rectangular exterior body 1. .
FIG. 15C is a diagram illustrating an example in which the joining portion 91 is arranged at a position overlapping the winding start side end portion 30x in the insulating sheet 30 in a direction perpendicular to the bottom portion 1a of the rectangular exterior body 1.
FIG. 15D shows that in the direction perpendicular to the bottom portion 1 a of the rectangular exterior body 1, the joining portion 91 is located closer to the bottom 1 a side of the rectangular exterior body 1 than the winding start side end portion 30 x of the insulating sheet 30. An example is shown.

角形外装体１の底部１ａに対して垂直な方向において、接合部９１を、絶縁シート３０における巻き始め側端部３０ｘの近傍に配置することが好ましい。このような構成であると、絶縁シート３０における巻き始め側端部３０ｘの外周側に配置される負極板５０が浮き上がることを抑制できる。   In the direction perpendicular to the bottom portion 1 a of the rectangular exterior body 1, the joining portion 91 is preferably disposed in the vicinity of the winding start side end portion 30 x in the insulating sheet 30. With such a configuration, it is possible to suppress the negative electrode plate 50 disposed on the outer peripheral side of the winding start side end portion 30x in the insulating sheet 30 from being lifted.

図１５（ａ）及び図１５（ｄ）に示す形態では、角形外装体１の底部１ａに対して垂直な方向において、接合部９１と絶縁シート３０における巻き始め側端部３０ｘが離間している。このような場合は、角形外装体１の底部１ａに対して垂直な方向における巻回電極体３の長さＬ（ｍｍ）に対して、角形外装体１の底部１ａに対して垂直な方向における接合部９１と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ４（ｍｍ）は、１０％以下であることが好ましく、５％以下であることがより好ましい。なお、距離Ｄ４（ｍｍ）は、６ｍｍ以下であることが好ましく、４ｍｍ以下であることがより好ましい。   15A and 15D, the joining portion 91 and the winding start side end portion 30x of the insulating sheet 30 are separated from each other in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1. . In such a case, the length L (mm) of the spirally wound electrode body 3 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1 is in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. The distance D4 (mm) between the winding start side end portion 30x of the joining portion 91 and the insulating sheet 30 is preferably 10% or less, and more preferably 5% or less. The distance D4 (mm) is preferably 6 mm or less, and more preferably 4 mm or less.

なお、図１５（ｂ）及び図１５（ｃ）に示す形態においては、角形外装体１の底部１ａに対して垂直な方向における接合部９１と絶縁シート３０における巻き始め側端部３０ｘの距離Ｄ４（ｍｍ）は０ｍｍである。   15B and 15C, the distance D4 between the joining portion 91 and the winding start side end portion 30x in the insulating sheet 30 in the direction perpendicular to the bottom portion 1a of the rectangular exterior body 1. (Mm) is 0 mm.

なお、角形外装体１の底部１ａに対して垂直な方向において、角形外装体１の底部１ａに対して垂直な方向における正極側の接合部９０と絶縁シート３０における巻き始め側端部３０ｘの距離は、長さＬ（ｍｍ）に対して１０％以下であることが好ましく、５％であることがより好ましい。   Note that, in the direction perpendicular to the bottom 1a of the rectangular exterior body 1, the distance between the positive electrode side joining portion 90 and the winding start side end 30x in the insulating sheet 30 in the direction perpendicular to the bottom 1a of the rectangular exterior body 1. Is preferably 10% or less with respect to the length L (mm), more preferably 5%.

［その他］
正極芯体露出部と正極集電体ないし正極集電体受け部品との接続、負極芯体露出部と負極集電体ないし負極集電体受け部品との接続は、それぞれ抵抗溶接、超音波溶接、あるいはレーザ溶接等により行われることが好ましい。 [Others]
The connection between the positive electrode core exposed portion and the positive electrode current collector or the positive electrode current collector receiving component, and the connection between the negative electrode core exposed portion and the negative electrode current collector or the negative electrode current collector receiving component are resistance welding and ultrasonic welding, respectively. Alternatively, it is preferably performed by laser welding or the like.

上述の実施形態及び変形例においては、正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが角形外装体１の底部１ａ側を向く例を示したが、これに限定されない。正極板４０の巻き終わり端部４０ｘ及び負極板５０の巻き終わり端部５０ｘが封口板２側を向くようにしてもよい。   In the above-described embodiment and the modification, the example in which the winding end end portion 40x of the positive electrode plate 40 and the winding end end portion 50x of the negative electrode plate 50 face the bottom 1a side of the rectangular exterior body 1 is shown, but the present invention is not limited thereto. . The winding end end portion 40x of the positive electrode plate 40 and the winding end end portion 50x of the negative electrode plate 50 may face the sealing plate 2 side.

偏平状の巻回電極体の巻回軸が延びる方向における偏平状の巻回電極体の長さは、５０ｍｍ〜２００ｍｍであることが好ましく、８０ｍｍ〜１５０ｍｍであることがより好ましい。偏平状の巻回電極体の巻回軸に対して垂直な方向（角形外装体の底部に対して垂直な方向）における偏平状の巻回電極体の長さは、５０ｍｍ〜１００ｍｍであることが好ましく、５０ｍｍ〜８０ｍｍであることがより好ましい。偏平状の巻回電極体の厚みは、５ｍｍ〜３０ｍｍであることが好ましく、６ｍｍ〜２０ｍｍであることがより好ましい。   The length of the flat wound electrode body in the direction in which the winding axis of the flat wound electrode body extends is preferably 50 mm to 200 mm, and more preferably 80 mm to 150 mm. The length of the flat wound electrode body in the direction perpendicular to the winding axis of the flat wound electrode body (the direction perpendicular to the bottom of the rectangular exterior body) is 50 mm to 100 mm. Preferably, it is 50 mm-80 mm. The thickness of the flat wound electrode body is preferably 5 mm to 30 mm, and more preferably 6 mm to 20 mm.

角形外装体の底部に対して垂直な方向において、負極側の集電部材の接続部と絶縁シートにおける巻き始め側端部との距離は、１０ｍｍ以下であることが好ましく、８ｍｍ以下であることがより好ましく、６ｍｍ以下であることが更に好ましい。また、角形外装体の
底部に対して垂直な方向において、負極芯体露出部同士の接合部と絶縁シートにおける巻き始め側端部との距離は、１０ｍｍ以下であることが好ましく、８ｍｍ以下であることがより好ましく、６ｍｍ以下であることが更に好ましい。 In a direction perpendicular to the bottom of the rectangular exterior body, the distance between the connecting portion of the negative electrode current collector and the winding start side end of the insulating sheet is preferably 10 mm or less, and preferably 8 mm or less. More preferably, it is 6 mm or less. Further, in the direction perpendicular to the bottom of the rectangular exterior body, the distance between the joint between the negative electrode core exposed portions and the winding start side end of the insulating sheet is preferably 10 mm or less, and preferably 8 mm or less. More preferably, it is 6 mm or less.

正極板、負極板、セパレータ、電解液等の各材料は、リチウムイオン二次電池に使用される公知のものを使用することができる。   As materials such as a positive electrode plate, a negative electrode plate, a separator, and an electrolytic solution, known materials used in lithium ion secondary batteries can be used.

正極活物質としては、リチウム遷移金属複合酸化物を用いることが好ましい。リチウム遷移金属複合酸化物としては、コバルト酸リチウム、マンガン酸リチウム、ニッケル酸リチウム、リチウムニッケルマンガン複合酸化物、リチウムニッケルコバルト複合酸化物、リチウムニッケルコバルトマンガン複合酸化物等が挙げられる。また、上記のリチウム遷移金属複合酸化物にＡｌ、Ｔｉ、Ｚｒ、Ｗ、Ｎｂ、Ｂ、Ｍｇ又はＭｏ等を添加したものも使用し得る。   As the positive electrode active material, it is preferable to use a lithium transition metal composite oxide. Examples of the lithium transition metal composite oxide include lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel manganese composite oxide, lithium nickel cobalt composite oxide, and lithium nickel cobalt manganese composite oxide. Moreover, what added Al, Ti, Zr, W, Nb, B, Mg, Mo, etc. to said lithium transition metal complex oxide can also be used.

負極活物質としてはリチウムイオンの吸蔵・放出が可能な炭素材料を用いることが好ましい。リチウムイオンの吸蔵・放出が可能な炭素材料としては、黒鉛、難黒鉛性炭素、易黒鉛性炭素、繊維状炭素、コークス及びカーボンブラック等が挙げられる。これらの内、特に黒鉛が好ましい。さらに、非炭素系材料としては、シリコン、スズ、及びそれらを主とする合金や酸化物などが挙げられる。   As the negative electrode active material, a carbon material capable of inserting and extracting lithium ions is preferably used. Examples of the carbon material capable of occluding and releasing lithium ions include graphite, non-graphitizable carbon, graphitizable carbon, fibrous carbon, coke, and carbon black. Of these, graphite is particularly preferable. Furthermore, examples of the non-carbon material include silicon, tin, and alloys and oxides mainly containing them.

非水電解質の非水溶媒（有機溶媒）としては、カーボネート類、ラクトン類、エーテル類、ケトン類、エステル類等を使用することができ、これらの溶媒の２種類以上を混合して用いることができる。例えば、エチレンカーボネート、プロピレンカーボネート、ブチレンカーボネート等の環状カーボネート、ジメチルカーボネート、エチルメチルカーボネート、ジエチルカーボネート等の鎖状カーボネートを用いることができる。特に、環状カーボネートと鎖状カーボネートとの混合溶媒を用いることが好ましい。また、ビニレンカーボネート（ＶＣ）などの不飽和環状炭酸エステルを非水電解質に添加することもできる。   As the nonaqueous solvent (organic solvent) of the nonaqueous electrolyte, carbonates, lactones, ethers, ketones, esters and the like can be used, and two or more of these solvents can be used in combination. it can. For example, cyclic carbonates such as ethylene carbonate, propylene carbonate, and butylene carbonate, and chain carbonates such as dimethyl carbonate, ethyl methyl carbonate, and diethyl carbonate can be used. In particular, it is preferable to use a mixed solvent of a cyclic carbonate and a chain carbonate. Moreover, unsaturated cyclic carbonates such as vinylene carbonate (VC) can also be added to the nonaqueous electrolyte.

非水電解質の電解質塩としては、従来のリチウムイオン二次電池において電解質塩として一般に使用されているものを用いることができる。例えば、ＬｉＰＦ６、ＬｉＢＦ４、ＬｉＣＦ３ＳＯ３、ＬｉＮ（ＣＦ３ＳＯ２）２、ＬｉＮ（Ｃ２Ｆ５ＳＯ２）２、ＬｉＮ（ＣＦ３ＳＯ２）（Ｃ４Ｆ９ＳＯ２）、ＬｉＣ（ＣＦ３ＳＯ２）３、ＬｉＣ（Ｃ２Ｆ５ＳＯ２）３、ＬｉＡｓＦ６、ＬｉＣｌＯ４、Ｌｉ２Ｂ１０Ｃｌ１０、Ｌｉ２Ｂ１２Ｃｌ１２、ＬｉＢ（Ｃ２Ｏ４）２、ＬｉＢ（Ｃ２Ｏ４）Ｆ２、ＬｉＰ（Ｃ２Ｏ４）３、ＬｉＰ（Ｃ２Ｏ４）２Ｆ２、ＬｉＰ（Ｃ２Ｏ４）Ｆ４等及びそれらの混合物が用いられる。これらの中でも、ＬｉＰＦ６が特に好ましい。また、前記非水溶媒に対する電解質塩の溶解量は、０．５〜２．０ｍｏｌ／Ｌとするのが好ましい。 As the electrolyte salt of the non-aqueous electrolyte, those generally used as the electrolyte salt in the conventional lithium ion secondary battery can be used. For example, LiPF 6 , LiBF 4 , LiCF 3 SO 3 , LiN (CF 3 SO 2 ) 2 , LiN (C 2 F 5 SO 2 ) 2 , LiN (CF 3 SO 2 ) (C 4 F 9 SO 2 ), LiC (CF 3 SO 2 ) 3 , LiC (C 2 F 5 SO 2 ) 3 , LiAsF 6 , LiClO 4 , Li 2 B 10 Cl 10 , Li 2 B 12 Cl 12 , LiB (C 2 O 4 ) 2 , LiB ( C 2 O 4 ) F 2 , LiP (C 2 O 4 ) 3 , LiP (C 2 O 4 ) 2 F 2 , LiP (C 2 O 4 ) F 4 and the like and mixtures thereof are used. Among these, LiPF 6 is particularly preferable. The amount of electrolyte salt dissolved in the non-aqueous solvent is preferably 0.5 to 2.0 mol / L.

セパレータとしては、ポリオレフィン製の多孔質セパレータを用いることが好ましい。ポリオレフィンとしては特に、ポリプロピレン（ＰＰ）やポリエチレン（ＰＥ）などが好ましい。また、ポリプロピレン（ＰＰ）とポリエチレン（ＰＥ）の３層構造（ＰＰ/ＰＥ/ＰＰ、あるいはＰＥ/ＰＰ/ＰＥ）を有するセパレータを用いることもできる。また、ポリマー電解質をセパレータとして用いてもよい。   As the separator, a polyolefin porous separator is preferably used. As the polyolefin, polypropylene (PP), polyethylene (PE) and the like are particularly preferable. A separator having a three-layer structure (PP / PE / PP or PE / PP / PE) of polypropylene (PP) and polyethylene (PE) can also be used. Further, a polymer electrolyte may be used as a separator.

正極板の巻き終わり端部の近傍に貼り付けられる絶縁シートは、絶縁テープであることが好ましい。絶縁テープは、シート基材と、シート基材上に形成された糊剤層を含む。シート基材には、ポリエチレン、ポリプロピレン、ポリエステル、ナイロン、塩化ビニール、テフロン（登録商標）、ポリイミド、カプトン（登録商標）、ポリフェニレンサルファドなどが使用される。また、糊剤には、アクリル系、シリコン系、ゴム系粘着剤などが使
用される。なお、シート基材上において、糊剤層が形成されない領域を設けることが好ましい。シート基材は、リチウムイオン非透過性のものが好ましい。 The insulating sheet attached in the vicinity of the end of winding of the positive electrode plate is preferably an insulating tape. The insulating tape includes a sheet base material and a paste layer formed on the sheet base material. For the sheet substrate, polyethylene, polypropylene, polyester, nylon, vinyl chloride, Teflon (registered trademark), polyimide, Kapton (registered trademark), polyphenylene sulfide, and the like are used. In addition, an acrylic, silicon, rubber adhesive, or the like is used as the paste. In addition, it is preferable to provide the area | region where a paste layer is not formed on a sheet | seat base material. The sheet base material is preferably lithium ion impermeable.

絶縁シートの厚みは、１μｍ〜１００μｍであることが好ましく、１μｍ〜５０μｍであることがより好ましく、２０μｍ〜４５μｍであることが更に好ましい。   The thickness of the insulating sheet is preferably 1 μm to 100 μm, more preferably 1 μm to 50 μm, and still more preferably 20 μm to 45 μm.

２０・・・角形二次電池
１・・・角形外装体
１ａ・・・底部
１ｂ・・・第１側壁
１ｃ・・・第２側壁
２・・・封口板
３・・・巻回電極体

４０・・・正極板
４０ａ・・・正極芯体
４０ｂ・・・正極活物質合剤層
４０ｘ・・・巻き終わり端部

５０・・・負極板
５０ａ・・・負極芯体
５０ｂ・・・負極活物質合剤層
５０ｘ・・・巻き終わり端部

４・・・正極芯体露出部
５・・・負極芯体露出部
６・・・正極集電体
６ａ・・・接続部
６ｂ・・・リード部
６ｃ・・・ベース部
７・・・正極端子
８・・・負極集電体
８ａ・・・接続部
８ｂ・・・リード部
８ｃ・・・ベース部
９・・・負極端子
１０・・・外部側絶縁部材
１１・・・内部側絶縁部材
１２・・・外部側絶縁部材
１３・・・内部側絶縁部材
１４・・・樹脂シート
１５・・・ガス排出弁
１６・・・封止栓
１７・・・セパレータ

３０・・・絶縁シート
３０ａ・・・シート基材
３０ｂ・・・糊剤層
３０ｘ・・・巻き始め側端部

７０・・・隙間

６０・・・正極集電体受け部品
８０・・・負極集電体受け部品

９０・・・接合部
９１・・・接合部


























DESCRIPTION OF SYMBOLS 20 ... Square secondary battery 1 ... Square exterior body 1a ... Bottom 1b ... 1st side wall 1c ... 2nd side wall 2 ... Sealing plate 3 ... Winding electrode body

40 ... Positive electrode plate 40a ... Positive electrode core body 40b ... Positive electrode active material mixture layer 40x ... End of winding end

DESCRIPTION OF SYMBOLS 50 ... Negative electrode plate 50a ... Negative electrode core 50b ... Negative electrode active material mixture layer 50x ... End of winding end

DESCRIPTION OF SYMBOLS 4 ... Positive electrode core exposure part 5 ... Negative electrode core exposure part 6 ... Positive electrode collector 6a ... Connection part 6b ... Lead part 6c ... Base part 7 ... Positive electrode terminal 8 ... Negative electrode current collector 8a ... Connection part 8b ... Lead part 8c ... Base part 9 ... Negative electrode terminal 10 ... External insulating member 11 ... Internal insulating member 12 .... External insulating member 13 ... Internal insulating member 14 ... Resin sheet 15 ... Gas discharge valve 16 ... Sealing plug 17 ... Separator

30 ... Insulating sheet 30a ... Sheet base material 30b ... Glue layer 30x ... Winding side end

70 ... Gap

60: Positive current collector receiving part 80: Negative current collector receiving part

90 ... Junction 91 ... Joint


























Claims (8)

長尺状の正極板と長尺状の負極板を長尺状のセパレータを介して巻回した偏平状の巻回電極体と、
開口、底部、一対の第１側壁、及び一対の第２側壁を有する角形外装体と、
前記開口を封口する封口板を備えた角形リチウムイオン二次電池であって、
前記巻回電極体は、一方の端部に巻回された正極芯体露出部を有し、他方の端部に巻回された負極芯体露出部を有し、
前記巻回電極体は、前記巻回電極体の巻回軸が前記底部に対して平行となる向きで前記角形外装体内に配置され、
前記巻回された正極芯体露出部には正極集電部材が接続され、
前記巻回された負極芯体露出部には負極集電部材が接続され、
前記正極板の巻き終わり端部の近傍の外周側の面には絶縁シートが貼り付けられており、
前記正極板の巻き終わり端部の外周側には前記セパレータを介して前記負極板が配置され、
前記負極集電部材は、前記巻回された負極芯体露出部の外面上に直接又は樹脂フィルムを介して配置される接続部を有し、
前記接続部は、前記負極板において前記正極板の巻き終わり端部よりも外周側に位置する領域における負極芯体露出部上に配置され、
前記底部に対して垂直な方向において、前記接続部の前記底部側の端部は前記巻回電極体の中心よりも前記封口板側に位置し、
前記底部に対して垂直な方向において、前記接続部と前記絶縁シートにおける巻き始め側端部との距離が、前記底部に対して垂直な方向における前記巻回電極体の長さの１０％以下である角形リチウムイオン二次電池。 A flat wound electrode body in which a long positive electrode plate and a long negative electrode plate are wound through a long separator;
A rectangular exterior body having an opening, a bottom, a pair of first side walls, and a pair of second side walls;
A prismatic lithium ion secondary battery provided with a sealing plate for sealing the opening,
The wound electrode body has a positive electrode core exposed part wound around one end, and a negative electrode core exposed part wound around the other end;
The wound electrode body is disposed in the rectangular exterior body in a direction in which a winding axis of the wound electrode body is parallel to the bottom portion,
A positive electrode current collecting member is connected to the wound positive electrode core exposed portion,
A negative electrode current collector is connected to the wound negative electrode core exposed portion,
An insulating sheet is attached to the outer peripheral surface in the vicinity of the winding end of the positive electrode plate,
The negative electrode plate is disposed on the outer peripheral side of the end of winding of the positive electrode plate via the separator,
The negative electrode current collecting member has a connection part arranged directly or via a resin film on the outer surface of the wound negative electrode core body exposed part,
The connecting portion is disposed on the negative electrode core exposed portion in the region located on the outer peripheral side of the negative electrode plate from the winding end portion of the positive electrode plate,
In the direction perpendicular to the bottom part, the end part on the bottom part side of the connection part is located closer to the sealing plate than the center of the wound electrode body,
In a direction perpendicular to the bottom portion, a distance between the connection portion and a winding start side end portion of the insulating sheet is 10% or less of a length of the wound electrode body in a direction perpendicular to the bottom portion. A certain square lithium ion secondary battery. 前記負極集電部材は負極集電体であり、
前記負極集電体は、前記接続部と、前記封口板と前記巻回電極体の間に配置されるベース部と、前記ベース部と前記接続部を繋ぐリード部を有する請求項１に記載の角形リチウムイオン二次電池。 The negative electrode current collector is a negative electrode current collector;
The said negative electrode electrical power collector has the said connection part, the base part arrange | positioned between the said sealing board and the said winding electrode body, and the lead part which connects the said base part and the said connection part. Square lithium ion secondary battery. 前記巻回された負極芯体露出部の一方の外面には負極集電体が接続され、前記巻回された負極芯体露出部の他方の外面には負極集電体受け部品が接続され、
前記負極集電体受け部品が前記接続部を含む請求項１に記載の角形リチウムイオン二次電池。 A negative electrode current collector is connected to one outer surface of the wound negative electrode core exposed portion, and a negative electrode current collector receiving component is connected to the other outer surface of the wound negative electrode core exposed portion,
The prismatic lithium ion secondary battery according to claim 1, wherein the negative electrode current collector receiving component includes the connection portion. 前記正極板の巻き終わり端部の近傍の外周側の面及び内周側の面に前記絶縁シートが貼り付けられた請求項１〜３のいずれかに記載の角形リチウムイオン二次電池。   The prismatic lithium ion secondary battery according to any one of claims 1 to 3, wherein the insulating sheet is attached to an outer peripheral surface and an inner peripheral surface in the vicinity of a winding end end of the positive electrode plate. 前記絶縁シートは、シート基材の表面に糊剤層が形成されたテープであり、
前記糊剤層により前記絶縁シートが前記正極板に貼り付けられた請求項１〜４のいずれかに記載の角形リチウムイオン二次電池。 The insulating sheet is a tape having a paste layer formed on the surface of a sheet base material,
The prismatic lithium ion secondary battery according to any one of claims 1 to 4, wherein the insulating sheet is attached to the positive electrode plate by the paste layer. 長尺状の正極板と長尺状の負極板を長尺状のセパレータを介して巻回した偏平状の巻回電極体と、
開口、底部、一対の第１側壁、及び一対の第２側壁を有する角形外装体と、
前記開口を封口する封口板を備えた角形リチウムイオン二次電池であって、
前記巻回電極体は、一方の端部に巻回された正極芯体露出部を有し、他方の端部に巻回された負極芯体露出部を有し、
前記巻回電極体は、前記巻回電極体の巻回軸が前記底部に対して平行となる向きで前記
角形外装体内に配置され、
前記巻回された正極芯体露出部には正極集電部材が接続され、
前記巻回された負極芯体露出部には負極集電部材が接続され、
前記正極板の巻き終わり端部の近傍の外周側の面には絶縁シートが貼り付けられており、
前記負極板において、前記正極板の巻き終わり端部よりも外周側に位置する領域における負極芯体露出部上には、前記負極芯体露出部同士が接合された接合部が配置され、
前記底部に対して垂直な方向において、前記接合部の前記底部側の端部は、前記巻回電極体の中心よりも前記封口板側に位置し、
前記底部に対して垂直な方向において、前記接合部と前記絶縁シートにおける巻き始め側端部との距離が、前記底部に対して垂直な方向における前記巻回電極体の長さの１０％以下である角形リチウムイオン二次電池。 A flat wound electrode body in which a long positive electrode plate and a long negative electrode plate are wound through a long separator;
A rectangular exterior body having an opening, a bottom, a pair of first side walls, and a pair of second side walls;
A prismatic lithium ion secondary battery provided with a sealing plate for sealing the opening,
The wound electrode body has a positive electrode core exposed part wound around one end, and a negative electrode core exposed part wound around the other end;
The wound electrode body is disposed in the rectangular exterior body in a direction in which a winding axis of the wound electrode body is parallel to the bottom portion,
A positive electrode current collecting member is connected to the wound positive electrode core exposed portion,
A negative electrode current collector is connected to the wound negative electrode core exposed portion,
An insulating sheet is attached to the outer peripheral surface in the vicinity of the winding end of the positive electrode plate,
In the negative electrode plate, on the negative electrode core exposed portion in the region located on the outer peripheral side of the winding end end portion of the positive electrode plate, a bonded portion in which the negative electrode core exposed portions are bonded is disposed,
In the direction perpendicular to the bottom portion, the end portion on the bottom side of the joint portion is located closer to the sealing plate than the center of the wound electrode body,
In a direction perpendicular to the bottom, the distance between the joint and the winding start side end of the insulating sheet is 10% or less of the length of the wound electrode body in the direction perpendicular to the bottom. A certain square lithium ion secondary battery. 前記正極板の巻き終わり端部の近傍の外周側の面及び内周側の面に前記絶縁シートが貼り付けられた請求項６に記載の角形リチウムイオン二次電池。   The prismatic lithium ion secondary battery according to claim 6, wherein the insulating sheet is attached to an outer peripheral surface and an inner peripheral surface in the vicinity of a winding end end of the positive electrode plate. 前記絶縁シートは、シート基材の表面に糊剤層が形成されたテープであり、
前記糊剤層により前記絶縁シートが前記正極板に貼り付けられた請求項６又は７に記載の角形リチウムイオン二次電池。




The insulating sheet is a tape having a paste layer formed on the surface of a sheet base material,
The prismatic lithium ion secondary battery according to claim 6 or 7, wherein the insulating sheet is attached to the positive electrode plate by the paste layer.




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