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JPWO2017047278A1 - Secondary battery - Google Patents

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JPWO2017047278A1
JPWO2017047278A1 JP2017539768A JP2017539768A JPWO2017047278A1 JP WO2017047278 A1 JPWO2017047278 A1 JP WO2017047278A1 JP 2017539768 A JP2017539768 A JP 2017539768A JP 2017539768 A JP2017539768 A JP 2017539768A JP WO2017047278 A1 JPWO2017047278 A1 JP WO2017047278A1
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current collecting
flat
secondary battery
plate
wound group
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JP6505853B2 (en
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貴宏 相馬
貴宏 相馬
小島　亮
亮 小島
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Hitachi Astemo Ltd
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Hitachi Automotive Systems Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)

Abstract

未固定の集電タブの座屈による内部ショートを防止する二次電池を得ること。本発明の二次電池１００は、正極電極４０と負極電極３０を重ねて扁平状に捲回して捲回軸方向両側に金属箔露出部４２ａ、３２ａを有する扁平捲回群３と、扁平捲回群３の金属箔露出部４２ａ、３２ａを扁平捲回群３の厚み方向に一括に束ねた状態で接続される集電板２００、１９０を有する。扁平捲回群３は、正極金属箔露出部４２ａが複数の集電タブ４３を有しており、複数の集電タブ４３のうち扁平捲回群３の平坦部に位置する集電タブ４３の少なくとも一部と、扁平捲回群３の湾曲部に位置する集電タブ４３の少なくとも一部とが、挟持部材３００によって集電板２００に固定されている。To obtain a secondary battery that prevents an internal short circuit due to buckling of an unfixed current collecting tab. The secondary battery 100 of the present invention includes a flat wound group 3 in which the positive electrode 40 and the negative electrode 30 are overlapped and wound in a flat shape to have metal foil exposed portions 42a and 32a on both sides in the winding axis direction. The current collector plates 200 and 190 are connected in a state where the metal foil exposed portions 42a and 32a of the group 3 are bundled together in the thickness direction of the flat wound group 3. In the flat wound group 3, the positive electrode metal foil exposed portion 42 a has a plurality of current collecting tabs 43, and the current collecting tab 43 located at the flat portion of the flat wound group 3 among the plurality of current collecting tabs 43. At least a part and at least a part of the current collecting tab 43 located at the curved portion of the flat wound group 3 are fixed to the current collecting plate 200 by the clamping member 300.

Description

本発明は、例えば扁平捲回群を有する角形の二次電池に関する。   The present invention relates to a prismatic secondary battery having, for example, a flat wound group.

特許文献１に示す形状の角形二次電池は、正極電極と負極電極を間にセパレータを介して軸芯に捲回し、捲回軸方向一方側と他方側に正極電極の金属箔露出部と負極電極の金属箔露出部とが分かれて配置された扁平状の捲回群を有する角形二次電池であり、捲回群は、正極電極と負極電極のいずれか一方の金属箔露出部が複数の集電タブを有し、複数の集電タブを有する金属箔露出部は、軸芯溝に嵌合される支柱部を有した集電環に接合され、集電環は、正極集電板に接合されて、軸芯に嵌合されて固定された構成を有している。   In the prismatic secondary battery having the shape shown in Patent Document 1, a positive electrode and a negative electrode are wound around an axis through a separator, and a metal foil exposed portion and a negative electrode of the positive electrode are arranged on one side and the other side in the winding axis direction. It is a prismatic secondary battery having a flat wound group in which a metal foil exposed part of an electrode is arranged separately, and the wound group includes a plurality of metal foil exposed parts of either the positive electrode or the negative electrode A metal foil exposed portion having a current collecting tab and having a plurality of current collecting tabs is joined to a current collecting ring having a column portion fitted in the shaft groove, and the current collecting ring is attached to the positive electrode current collecting plate. It has the structure joined and fixed to the shaft core.

特開２０１５−６０８２３号公報Japanese Patent Laying-Open No. 2015-60823

上述した従来技術では、複数の集電タブは、軸芯溝に嵌合される支柱部を有した集電環で束ねられて集電部材と溶接されており、集電環は、軸芯に嵌合されて固定されている。したがって、電極を捲回する軸芯の分だけ電極体積が確保できず、電池容量が減少する。集電タブのない扁平捲回群では、軸芯のないタイプが従来から存在しており、金属箔露出部の平坦部が金属板で固定されて電気的に接合された構造となっている。   In the above-described prior art, the plurality of current collecting tabs are bundled with a current collecting ring having a column portion fitted to the shaft core groove and welded to the current collecting member, and the current collecting ring is attached to the shaft core. It is fitted and fixed. Therefore, the electrode volume cannot be ensured by the amount of the axial center around which the electrode is wound, and the battery capacity is reduced. In a flat wound group without a current collecting tab, there is a type without an axial center, and a flat part of a metal foil exposed part is fixed by a metal plate and is electrically connected.

しかしながら、上述のように平坦部および湾曲部に複数の集電タブを有する扁平捲回群では、湾曲部に位置するタブが金属板に固定されないので、座屈して電池内部でショートする懸念がある。   However, in the flat wound group having a plurality of current collecting tabs in the flat part and the curved part as described above, the tab located in the curved part is not fixed to the metal plate, so there is a concern that it buckles and shorts inside the battery. .

本発明は、上記の点に鑑みてなされたものであり、その目的とするところは、未固定の集電タブの座屈による内部ショートを防止する二次電池を提供することにある。   The present invention has been made in view of the above points, and an object thereof is to provide a secondary battery that prevents an internal short circuit due to buckling of an unfixed current collecting tab.

上記課題を解決する本発明の二次電池は、正極電極と負極電極を重ねて扁平状に捲回して捲回軸方向両側に金属箔露出部を有する扁平捲回群と、該扁平捲回群の金属箔露出部を前記扁平捲回群の厚み方向に一括に束ねた状態で接続される集電板を有し、前記扁平捲回群は、少なくとも一方側の金属箔露出部が複数の集電タブを有しており、該複数の集電タブのうち前記扁平捲回群の平坦部に位置する集電タブの少なくとも一部と、前記扁平捲回群の湾曲部に位置する集電タブの少なくとも一部とが、固定部材によって前記集電板に固定されていることを特徴とする。   The secondary battery of the present invention that solves the above problems includes a flat wound group in which a positive electrode and a negative electrode are overlapped and wound in a flat shape to have metal foil exposed portions on both sides in the winding axis direction, and the flat wound group A current collector plate connected in a bundled state in the thickness direction of the flat wound group, and the flat wound group has a plurality of metal foil exposed parts on at least one side. A power collecting tab, and among the plurality of current collecting tabs, at least a part of the current collecting tab located at a flat portion of the flat wound group and a current collecting tab located at a curved portion of the flat wound group Is fixed to the current collector plate by a fixing member.

本発明によれば、集電タブの座屈による内部ショートを回避できる。なお、上記した以外の課題、構成及び効果は、以下の実施形態の説明により明らかにされる。   According to the present invention, an internal short circuit due to the buckling of the current collecting tab can be avoided. Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

角形二次電池の外観斜視図。The external appearance perspective view of a square secondary battery. 角形二次電池の分解斜視図。The disassembled perspective view of a square secondary battery. 捲回群の展開斜視図。The expansion | deployment perspective view of a winding group. 集電板への接合方法を説明する分解斜視図。The disassembled perspective view explaining the joining method to a current collecting plate. 捲回群と集電部品の接合状態を示す展開図。The expanded view which shows the joining state of a winding group and current collection components. 弾性部材の装着状態を説明する図。The figure explaining the mounting state of an elastic member. 実施例２にかかる集電タブの接合方法を説明する分解斜視図。FIG. 9 is an exploded perspective view for explaining a method of joining current collecting tabs according to the second embodiment. 実施例３にかかる集電タブの接合方法を説明する分解斜視図。FIG. 10 is an exploded perspective view illustrating a method for joining current collecting tabs according to a third embodiment. 二枚の挟持部材により集電タブを挟持して固定する集電タブの接合方法を説明する分解斜視図。The disassembled perspective view explaining the joining method of the current collection tab which clamps and fixes a current collection tab with two clamping members. 実施例４にかかる集電タブの接合方法を説明する分解斜視図。FIG. 6 is an exploded perspective view for explaining a method of joining current collecting tabs according to a fourth embodiment. 実施例５にかかる集電タブの接合方法を説明する分解斜視図。FIG. 10 is an exploded perspective view illustrating a method for joining current collecting tabs according to a fifth embodiment. 実施例６にかかる集電タブの接合方法を説明する分解斜視図。FIG. 10 is an exploded perspective view illustrating a method for joining current collecting tabs according to a sixth embodiment. 実施例７にかかる集電タブの接合方法を説明する分解斜視図。FIG. 12 is an exploded perspective view for explaining a method of joining current collecting tabs according to a seventh embodiment. 集電板と挟持部材で集電タブを固定した、正極側の捲回群の正面図。The front view of the winding group by the side of the positive electrode which fixed the current collection tab with the current collecting plate and the clamping member. 集電タブを粘着テープ部材により固定した、正極側の捲回群の正面図。The front view of the winding group by the side of the positive electrode which fixed the current collection tab with the adhesive tape member.

以下、本発明による蓄電素子の実施の形態について、図面を参照して説明する。
［実施例１］
図１は蓄電素子の一実施の形態としての角形二次電池１００の外観斜視図であり、図２は角形二次電池１００の構成を示す分解斜視図である。Hereinafter, embodiments of a power storage device according to the present invention will be described with reference to the drawings.
[Example 1]
FIG. 1 is an external perspective view of a prismatic secondary battery 100 as an embodiment of a power storage element, and FIG. 2 is an exploded perspective view showing the configuration of the prismatic secondary battery 100.

図１に示すように、角形二次電池１００は、電池缶１と電池蓋６とからなる電池容器を備えている。電池缶１および電池蓋６の材質は、アルミニウムまたはアルミニウム合金などである。電池缶１は、深絞り加工を施すことによって、一端が開口された扁平な矩形箱状に形成されている。電池缶１は、矩形平板状の底面１ｄと、底面１ｄの一対の長辺部のそれぞれに設けられる一対の幅広側面１ｂと、底面１ｄの一対の短辺部のそれぞれに設けられる一対の幅狭側面１ｃとを有している。   As shown in FIG. 1, the rectangular secondary battery 100 includes a battery container including a battery can 1 and a battery lid 6. The material of the battery can 1 and the battery lid 6 is aluminum or an aluminum alloy. The battery can 1 is formed into a flat rectangular box shape having one end opened by performing deep drawing. The battery can 1 has a rectangular flat plate-like bottom surface 1d, a pair of wide side surfaces 1b provided on each of the pair of long side portions of the bottom surface 1d, and a pair of narrow width portions provided on each of the pair of short side portions of the bottom surface 1d. And a side surface 1c.

電池蓋６は、矩形平板状であって、電池缶１の開口を塞ぐようにレーザ溶接されている。つまり、電池蓋６は、電池缶１の開口を封止している。電池蓋６には、捲回群（扁平捲回群）３の正極電極４０及び負極電極３０（図３参照）と電気的に接続された正極外部端子１４及び負極外部端子１２が配置されている。なお、正極外部端子１４と電池蓋６の間、及び負極外部端子１２と電池蓋６の間にはそれぞれ短絡を防止する為の正極側外部絶縁体２４、負極側外部絶縁体２２が配置されている。   The battery lid 6 has a rectangular flat plate shape and is laser-welded so as to close the opening of the battery can 1. That is, the battery lid 6 seals the opening of the battery can 1. The battery lid 6 is provided with a positive electrode external terminal 14 and a negative electrode external terminal 12 electrically connected to the positive electrode 40 and the negative electrode 30 (see FIG. 3) of the wound group (flat wound group) 3. . A positive-side external insulator 24 and a negative-side external insulator 22 are arranged between the positive external terminal 14 and the battery cover 6 and between the negative external terminal 12 and the battery cover 6 to prevent short circuit. Yes.

正極外部端子１４には平板状のバスバー溶接部１４２が、負極外部端子１２には平板状のバスバー溶接部１５２がそれぞれ設けられている。組電池を作成する際にはバスバー溶接部１４２、１５２にバスバーを当接させて溶接することにより、バスバーと正極外部端子１４、バスバーと負極外部端子１２がそれぞれ接続される。   The positive external terminal 14 is provided with a flat bus bar welded portion 142, and the negative external terminal 12 is provided with a flat bus bar welded portion 152. When producing the assembled battery, the bus bar is connected to the positive electrode external terminal 14 and the bus bar is connected to the negative electrode external terminal 12 by welding the bus bar to the bus bar welding portions 142 and 152 so that they are welded.

また、電池蓋６には、ガス排出弁１０が設けられている。ガス排出弁１０は、プレス加工によって電池蓋６を部分的に薄肉化することで形成されている。なお、薄膜部材を電池蓋６の開口にレーザ溶接等により取り付けて、薄肉部分をガス排出弁としてもよい。ガス排出弁１０は、角形二次電池１００が過充電等の異常により発熱してガスが発生し、電池容器内の圧力が上昇して所定圧力に達したときに開裂して、内部からガスを排出することで電池容器内の圧力を低減させる。   The battery lid 6 is provided with a gas discharge valve 10. The gas discharge valve 10 is formed by partially thinning the battery cover 6 by press working. The thin-walled member may be attached to the opening of the battery lid 6 by laser welding or the like, and the thin portion may be used as a gas discharge valve. The gas discharge valve 10 generates heat when the square secondary battery 100 generates heat due to an abnormality such as overcharge, and when the pressure in the battery container rises and reaches a predetermined pressure, the gas discharge valve 10 is opened and gas is discharged from the inside. By discharging, the pressure in the battery container is reduced.

図２に示すように、電池缶１には蓋組立体１０１に保持された捲回群３（図３参照）が収容されている。捲回群３の正極電極４０（図３参照）に接合される正極集電板２００および捲回群３の負極電極３０（図３参照）に接合される負極集電体１９０ならびに捲回群３は、絶縁ケース１０８に覆われた状態で電池缶１に収容されている。絶縁ケース１０８の材質は、ポリプロピレン等の絶縁性を有する樹脂であり、電池缶１と、捲回群３とは電気的に絶縁されている。なお、ここで言う蓋組立体１０１は、捲回群３、正極側の集電板２００、正極外部端子１４、負極側の集電板１９０、負極外部端子１２及び電池蓋６を一体に組み立てたものである。   As shown in FIG. 2, the battery can 1 accommodates a wound group 3 (see FIG. 3) held by the lid assembly 101. The positive electrode current collector plate 200 bonded to the positive electrode 40 of the wound group 3 (see FIG. 3), the negative electrode current collector 190 bonded to the negative electrode 30 of the wound group 3 (see FIG. 3), and the wound group 3 Is housed in the battery can 1 while being covered with the insulating case 108. The material of the insulating case 108 is an insulating resin such as polypropylene, and the battery can 1 and the wound group 3 are electrically insulated. The lid assembly 101 referred to here is an assembly of the winding group 3, the positive current collector 200, the positive external terminal 14, the negative current collector 190, the negative external terminal 12, and the battery lid 6. Is.

正極外部端子１４は正極側の集電板２００を介して捲回群３の正極電極４０（図３参照）に電気的に接続され、負極外部端子１２は負極側の集電板１９０を介して捲回群３の負極電極３０（図３参照）に電気的に接続されている。このため、正極外部端子１４および負極外部端子１２を介して外部機器に電力が供給され、あるいは、正極外部端子１４および負極外部端子１２を介して外部発電電力が捲回群３に供給されて充電される。   The positive external terminal 14 is electrically connected to the positive electrode 40 (see FIG. 3) of the wound group 3 via the positive current collector plate 200, and the negative external terminal 12 is connected to the negative current collector 190. It is electrically connected to the negative electrode 30 (see FIG. 3) of the wound group 3. For this reason, electric power is supplied to the external device via the positive external terminal 14 and the negative external terminal 12, or external generated power is supplied to the winding group 3 via the positive external terminal 14 and the negative external terminal 12 for charging. Is done.

正極集電板２００は、正極外部端子１４と接続される基端面部２０１と、正極電極４０に接続される接合平面部２０３と、基端面部２０１と接合平面部２０３の間を接続する接続部２０２を有する。   The positive electrode current collector plate 200 includes a base end face part 201 connected to the positive electrode external terminal 14, a joining flat part 203 connected to the positive electrode 40, and a connecting part connecting the base end face part 201 and the joining flat part 203. 202.

正極集電板２００と同様に、負極側の集電板１９０も、負極外部端子１２と接続される基端面部１９１、負極電極３０に接続される接合平面部１９３と、基端面部１９１と接合平面部１９３の間を接続する接続部１９２を有する構造となっている。   Similarly to the positive electrode current collector plate 200, the negative electrode side current collector plate 190 is also connected to the negative electrode external terminal 12, a base end face part 191, a negative plane electrode 193 connected to the negative electrode 30, and a base end face part 191. It has a structure having a connecting portion 192 for connecting the flat portions 193.

また、図２に示すように、電池蓋６には、電池容器内に電解液を注入するための注液孔９が穿設されている。注液孔９は、電解液注入後に注液栓１１によって封止される。電解液としては、たとえば、エチレンカーボネート等の炭酸エステル系の有機溶媒に６フッ化リン酸リチウム（ＬｉＰＦ６）等のリチウム塩が溶解された非水電解液を用いることができる。As shown in FIG. 2, the battery lid 6 is provided with a liquid injection hole 9 for injecting an electrolytic solution into the battery container. The liquid injection hole 9 is sealed with a liquid injection stopper 11 after the electrolytic solution is injected. As the electrolytic solution, for example, a non-aqueous electrolytic solution in which a lithium salt such as lithium hexafluorophosphate (LiPF 6 ) is dissolved in a carbonate-based organic solvent such as ethylene carbonate can be used.

次に、図３を参照して捲回群３の構成について詳細に説明する。図３は、捲回群３を示す斜視図であり、捲回群３の巻き終り側を展開した状態を示している。   Next, the configuration of the wound group 3 will be described in detail with reference to FIG. FIG. 3 is a perspective view showing the wound group 3, and shows a state where the winding end side of the wound group 3 is developed.

発電要素である捲回群３は、帯状の正極電極４０および負極電極３０を間にセパレータ５１、５２を介在させて扁平状に捲回することで積層構造とされており、捲回軸方向両側には金属箔露出部が配置され、具体的には、捲回軸方向一方側と他方側に正極電極４０の正極金属箔露出部４２ａと負極電極３０の負極金属箔露出部３２ａとが分かれて配置されている。そして、捲回群３は、正極電極４０と負極電極３０のうちの一方である正極電極４０の正極金属箔露出部４２ａが複数の集電タブ４３を有し、他方である負極電極３０の負極金属箔露出部３２ａが所定幅で連続する構造を有している。   The winding group 3, which is a power generation element, has a laminated structure in which a strip-like positive electrode 40 and a negative electrode 30 are wound in a flat shape with separators 51 and 52 interposed therebetween. The metal foil exposed portion is arranged in the winding axis direction, specifically, the positive metal foil exposed portion 42a of the positive electrode 40 and the negative metal foil exposed portion 32a of the negative electrode 30 are separated on one side and the other side in the winding axis direction. Has been placed. In the wound group 3, the positive electrode metal foil exposed portion 42a of the positive electrode 40 that is one of the positive electrode 40 and the negative electrode 30 has a plurality of current collecting tabs 43, and the negative electrode of the negative electrode 30 that is the other one. The metal foil exposed portion 32a has a structure that continues with a predetermined width.

正極電極４０は、正極集電体である正極金属箔４２の両面に正極活物質合剤を塗工した正極活物質合剤層４１を有し、正極金属箔４２の幅方向一方側の端部には、正極活物質合剤が塗工されずに正極金属箔４２が露出した正極未塗工部（正極金属箔露出部）４２ａが設けられている。そして、正極未塗工部４２ａには、正極集電板２００（図２を参照）に電気的に接続される複数の集電タブ４３が切り欠き形成されている。   The positive electrode 40 has a positive electrode active material mixture layer 41 in which a positive electrode active material mixture is coated on both surfaces of a positive electrode metal foil 42 that is a positive electrode current collector, and an end portion on one side in the width direction of the positive electrode metal foil 42. Are provided with a positive electrode uncoated portion (positive metal foil exposed portion) 42a where the positive electrode metal foil 42 is exposed without being coated with the positive electrode active material mixture. A plurality of current collecting tabs 43 that are electrically connected to the positive electrode current collector plate 200 (see FIG. 2) are formed in the positive electrode uncoated portion 42a.

集電タブ４３は、正極金属箔４２の幅方向に沿って突出する凸形を有しており、正極金属箔４２の長手方向に沿って間隔をおいて設けられている。これら複数の集電タブ４３は、捲回群３の厚み方向に束ねられて集電板２００に固定される。   The current collecting tab 43 has a convex shape that protrudes along the width direction of the positive electrode metal foil 42, and is provided at intervals along the longitudinal direction of the positive electrode metal foil 42. The plurality of current collecting tabs 43 are bundled in the thickness direction of the wound group 3 and fixed to the current collecting plate 200.

負極電極３０は、負極集電体である負極金属箔３２の両面に負極活物質合剤を塗工した負極活物質合剤層３１を有し、負極金属箔３２の幅方向他方側の端部には、負極活物質合剤が塗工されずに負極金属箔３２が露出した負極未塗工部（負極金属箔露出部）３２ａが設けられている。負極未塗工部は、所定幅（例えば略一定幅）で連続する形状を有し、捲回群３の捲回軸方向他方側で積層されており、捲回群３の平坦部分の少なくとも一部が、捲回群３の厚さ方向に束ねられて負極集電板に接合（電気的に接続）される負極接続部となる。   The negative electrode 30 has a negative electrode active material mixture layer 31 in which a negative electrode active material mixture is coated on both surfaces of a negative electrode metal foil 32 that is a negative electrode current collector, and an end of the negative electrode metal foil 32 on the other side in the width direction. Is provided with a negative electrode uncoated portion (negative electrode metal foil exposed portion) 32a where the negative electrode metal foil 32 is exposed without being coated with the negative electrode active material mixture. The negative electrode uncoated portion has a continuous shape with a predetermined width (for example, a substantially constant width), is laminated on the other side in the winding axis direction of the wound group 3, and is at least one of the flat portions of the wound group 3. The portion is a negative electrode connection portion that is bundled in the thickness direction of the wound group 3 and joined (electrically connected) to the negative electrode current collector plate.

図４は、集電タブの接合方法を説明する分解斜視図である。
捲回群３は、集電タブ４３を有する正極電極４０と、所定幅の負極金属箔露出部３２ａ（負極未塗工部）を残したままの負極電極３０とを組み合わせて、それぞれの間にセパレータ５１、５２を挟み、捲回することによって扁平状に形成される。FIG. 4 is an exploded perspective view for explaining a method of joining the current collecting tabs.
The winding group 3 combines a positive electrode 40 having a current collecting tab 43 and a negative electrode 30 with a negative electrode metal foil exposed portion 32a (negative electrode uncoated portion) having a predetermined width left between them. The separators 51 and 52 are sandwiched and wound to form a flat shape.

この段階では正極側には複数の凸形の集電タブ４３が全周に渡って突出している。これらの集電タブ４３は、固定部材によって集電板２００に固定される。固定部材は、捲回群３の平坦部に位置するタブの少なくとも一部と、捲回群３の湾曲部に位置するタブの少なくとも一部とを挟持する挟持部材３００を有している。挟持部材３００は、集電タブ４３を集電板２００との間に挟持して溶接される金属製の平板３０１を有している。
蓋組立体１０１の組立作業では、正極側の集電板２００および挟持部材３００の取り付け作業と、負極側の集電板１９０および挟持部材１９５の取り付け作業が行われる。正極側および負極側に設けられる、挟持部材３００、１９５は、集電板２００、１９０とそれぞれ超音波溶接等により溶接して、電気的に接合し、電池外部端子との導電経路となるため、金属板からなることが望ましい。At this stage, a plurality of convex current collecting tabs 43 protrudes over the entire circumference on the positive electrode side. These current collecting tabs 43 are fixed to the current collecting plate 200 by fixing members. The fixing member includes a clamping member 300 that clamps at least a part of the tab located in the flat part of the wound group 3 and at least a part of the tab located in the curved part of the wound group 3. The clamping member 300 has a metal flat plate 301 that is clamped and welded between the current collecting tab 43 and the current collecting plate 200.
In the assembly operation of the lid assembly 101, an operation of attaching the current collector plate 200 and the holding member 300 on the positive electrode side and an operation of attaching the current collector plate 190 and the holding member 195 on the negative electrode side are performed. The clamping members 300 and 195 provided on the positive electrode side and the negative electrode side are welded to the current collector plates 200 and 190 by ultrasonic welding or the like, and are electrically joined to form a conductive path with the battery external terminal. It is desirable to consist of a metal plate.

本実施例では、挟持部材３００は、集電板２００の接合平面部２０３とほぼ同じ横幅と、捲回群３の一対の湾曲部間に亘る方向の長さとほぼ同じ長さを有する金属製の平板３０１によって構成されている。挟持部材１９５は、捲回群３の平坦部の長さ以下の平板によって構成されている。   In this embodiment, the clamping member 300 is made of a metal having substantially the same lateral width as that of the joining flat surface portion 203 of the current collector plate 200 and substantially the same length as the length between the pair of curved portions of the winding group 3. A flat plate 301 is used. The clamping member 195 is configured by a flat plate having a length equal to or less than the length of the flat portion of the wound group 3.

捲回群３の正極金属箔露出部４２ａ側の平坦部に位置する集電タブ４３と捲回群３の正極金属箔露出部４２ａ側の湾曲部に位置する集電タブ４３の少なくとも一部が、集電板２００と挟持部材３００により捲回群３の厚み方向に一括に挟持されて固定される。本実施例では、捲回群３の正極金属箔露出部４２ａ側の平坦部に位置する全ての集電タブ４３と、捲回群３の正極金属箔露出部４２ａ側の湾曲部に位置する全ての集電タブ４３とが挟持されて固定される。   At least a part of the current collecting tab 43 located on the flat portion on the positive electrode metal foil exposed portion 42a side of the wound group 3 and the current collecting tab 43 located on the curved portion on the positive electrode metal foil exposed portion 42a side of the wound group 3 are The current collector plate 200 and the clamping member 300 are clamped together in the thickness direction of the wound group 3 and fixed. In the present embodiment, all the current collecting tabs 43 located on the flat portion on the positive electrode metal foil exposed portion 42a side of the wound group 3 and all located on the curved portion on the positive electrode metal foil exposed portion 42a side of the wound group 3 are used. The current collecting tab 43 is clamped and fixed.

固定された集電タブ４３および集電タブ４３を挟持する集電板２００および挟持部材３００は、超音波溶接等により溶接される。集電板２００の接合平面部２０３と挟持部材３００の平板３０１は、間に集電タブ４３を挟持した状態で互いに溶接接合され、各集電タブ４３を固定し、電気的に接続された状態に保持する。   The fixed current collecting tab 43 and the current collecting plate 200 holding the current collecting tab 43 and the holding member 300 are welded by ultrasonic welding or the like. The joined flat portion 203 of the current collector plate 200 and the flat plate 301 of the clamping member 300 are welded and joined together with the current collecting tabs 43 sandwiched therebetween, and the current collecting tabs 43 are fixed and electrically connected. Hold on.

負極電極３０に設けられる所定幅の負極金属箔露出部３２ａは、平坦部の長さ方向における少なくとも一部が集電板１９０と挟持部材１９５との間に挟み込まれて、捲回群３の厚み方向に束ねられて固定される。固定された所定幅の負極金属箔露出部３２ａおよび集電板１９０と挟持部材１９５は超音波溶接等により溶接される。集電板１９０と挟持部材１９５は、間に負極金属箔露出部３２ａを束ねて挟持した状態で互いに溶接接合され、負極金属箔露出部３２ａを固定し、電気的に接続された状態に保持する。   The negative electrode metal foil exposed portion 32a having a predetermined width provided on the negative electrode 30 is at least partially sandwiched between the current collector plate 190 and the sandwiching member 195 in the length direction of the flat portion, so that the thickness of the wound group 3 is increased. Bundled in the direction and fixed. The fixed negative electrode metal foil exposed portion 32a having a predetermined width, the current collector plate 190 and the clamping member 195 are welded by ultrasonic welding or the like. The current collector plate 190 and the sandwiching member 195 are welded to each other with the negative electrode metal foil exposed portion 32a being bundled and sandwiched therebetween, and the negative electrode metal foil exposed portion 32a is fixed and held in an electrically connected state. .

本実施例は、捲回群３の平坦部と湾曲部に位置する集電タブ４３を捲回群３の厚み方向に一括に挟持して集電タブ４３を固定する構造であるので、未固定の集電タブ４３が発生するのを防ぐことができる。したがって、例えば集電板２００と集電タブ４３との接合時に集電板２００に集電タブ４３が接触して集電タブ４３が座屈する等による電池の内部ショートを回避することができる。なお、本実施例では、捲回群３の平坦部に位置する全ての集電タブ４３と、湾曲部に位置する全ての集電タブ４３とを一括に挟持する構成の場合について説明したが、捲回群３の平坦部に位置する全ての集電タブ４３と、湾曲部に位置する集電タブ４３の少なくとも一部とを一括に挟持する構成としてもよい。湾曲部に位置する集電タブ４３の全てではなく一部だけを挟持するだけでも、未固定の集電タブ４３の数を減らすことができ、座屈等による内部ショートの発生確率を低減させることができる。   In this embodiment, since the current collecting tabs 43 positioned at the flat portion and the curved portion of the winding group 3 are collectively clamped in the thickness direction of the winding group 3, the current collecting tabs 43 are fixed. Can be prevented from occurring. Therefore, for example, when the current collecting plate 200 and the current collecting tab 43 are joined, a short circuit inside the battery due to the current collecting tab 43 coming into contact with the current collecting plate 200 and buckling the current collecting tab 43 can be avoided. In addition, in the present embodiment, the case of a configuration in which all the current collecting tabs 43 located in the flat portion of the winding group 3 and all the current collecting tabs 43 located in the curved portion are collectively held, It is good also as a structure which clamps all the current collection tabs 43 located in the flat part of the winding group 3, and at least one part of the current collection tab 43 located in a curved part collectively. Even if only a part of the current collecting tabs 43 located in the curved portion are clamped, the number of unfixed current collecting tabs 43 can be reduced, and the probability of occurrence of an internal short circuit due to buckling or the like is reduced. Can do.

また、本実施例の構成によれば、集電板２００と挟持部材３００で集電タブ４３を固定するときに、軸芯等の部材を用いて位置合わせする必要がないため、正負極電極の捲回時に軸芯を不要にすることができる。したがって、軸芯体積に相当する電極体積が増えるため、電池容量を増すことができる。   Further, according to the configuration of the present embodiment, when the current collecting tab 43 is fixed by the current collecting plate 200 and the sandwiching member 300, it is not necessary to align using a member such as an axial core. An axis can be made unnecessary during winding. Therefore, since the electrode volume corresponding to the axial core volume increases, the battery capacity can be increased.

図５は、捲回群３と集電部品の接合状態を示す展開図である。
負極側の集電板１９０の接合平面部１９３は、電池缶１の幅広側面１ｂに対向する平面であり、即ち負極金属箔露出部３２ａの平坦部と平行な面である。負極金属箔露出部３２ａは、捲回群３の平坦部の一部が捲回群３の厚み方向に束ねられて負極接続部とされ、負極側の集電板１９０の接合平面部１９３に重ね合わせた状態で接合される。FIG. 5 is a development view showing a joined state of the wound group 3 and the current collecting component.
The joining flat surface portion 193 of the current collector plate 190 on the negative electrode side is a flat surface facing the wide side surface 1b of the battery can 1, that is, a surface parallel to the flat portion of the negative electrode metal foil exposed portion 32a. In the negative electrode metal foil exposed portion 32a, a part of the flat portion of the winding group 3 is bundled in the thickness direction of the winding group 3 to be a negative electrode connecting portion, and overlapped with the bonding flat portion 193 of the current collector plate 190 on the negative electrode side. Joined together.

正極側の集電板２００は、前述のように、その基端面部２０１において正極外部端子１４と電気的に接続され、負極側の集電板１９０も同様にその基端面部１９１において負極外部端子１２と電気的に接続されており、それぞれ共に電池蓋６に固定されて、蓋組立体１０１を構成している。よって、上述の構造により、捲回群３は、蓋組立体１０１に固定される。   As described above, the positive current collector plate 200 is electrically connected to the positive external terminal 14 at the base end surface portion 201, and the negative current collector plate 190 is similarly connected to the negative external terminal at the base end surface portion 191. 12 are both electrically connected to the battery lid 6 to constitute a lid assembly 101. Therefore, the wound group 3 is fixed to the lid assembly 101 by the above-described structure.

本実施例では、正極電極４０と負極電極３０のうち、正極電極４０の正極金属箔露出部４２ａのみに集電タブ４３を形成した構成を示した。これは、金属箔露出部に集電タブを形成しない場合は電極のプレス後において塗工部と金属箔露出部の圧縮量が異なるため、圧縮率の大きい塗工部の方が伸長し、長手方向に沿って移行するに従って幅方向に大きく湾曲するおそれがあるからである。とくに正極電極４０は、負極電極３０よりも金属箔の圧縮量が大きくなり、湾曲する傾向が大きくなる。これに対して本実施例では、正極電極４０の正極金属箔露出部４２ａに複数の集電タブ４３を設けるので、プレスによる湾曲の傾向が大きい電極に設けた場合に、かかる電極の湾曲の傾向を緩和できる。   In the present embodiment, the configuration in which the current collecting tab 43 is formed only on the positive electrode metal foil exposed portion 42 a of the positive electrode 40 of the positive electrode 40 and the negative electrode 30 is shown. This is because when the current collecting tab is not formed on the exposed metal foil portion, the amount of compression of the coated portion and the exposed metal foil portion is different after pressing the electrode. It is because there exists a possibility of curving greatly in the width direction as it moves along the direction. In particular, the positive electrode 40 has a greater amount of metal foil compression than the negative electrode 30 and has a greater tendency to bend. In contrast, in the present embodiment, since a plurality of current collecting tabs 43 are provided in the positive electrode metal foil exposed portion 42a of the positive electrode 40, when the electrode is provided with an electrode having a large tendency to bend due to pressing, the tendency of the electrode to bend. Can be relaxed.

なお、本実施例では、正極電極４０の正極金属箔露出部４２ａのみに集電タブ４３を形成した構成を示したが、例えば、正極金属箔露出部４２１および負極金属箔露出部３２ａの両方に凸形の集電タブを形成し、正負極側と同様の集電板および挟持部材を用いて、集電タブを集電板と挟持部材により接合しても良い。   In the present embodiment, the configuration in which the current collecting tab 43 is formed only on the positive electrode metal foil exposed portion 42a of the positive electrode 40 is shown. However, for example, both the positive electrode metal foil exposed portion 421 and the negative electrode metal foil exposed portion 32a are provided. A convex current collecting tab may be formed, and the current collecting tab may be joined by the current collecting plate and the holding member using the same current collecting plate and holding member as those on the positive and negative electrode sides.

図６は、弾性部材の装着状態を説明する図であり、電池缶１を断面で示した角形二次電池１００の全体組立構成図である。   FIG. 6 is a diagram for explaining a mounting state of the elastic member, and is an overall assembly configuration diagram of the square secondary battery 100 in which the battery can 1 is shown in cross section.

角形二次電池１００は、蓋組立体１０１の捲回群３を電池缶１に挿入して電池蓋６を電池缶１に溶接して組み立てられる。本実施例では、捲回群３と電池蓋６との間、及び捲回群３と電池缶１の底面１ｄとの間に弾性部材７０が介在されている。捲回群３は、正極側が集電タブ４３を介して集電板２００に支持されているので、負極金属箔露出部３２ａで支持されている負極側と比較して支持剛性が低く、電池缶１内で振動や衝撃の影響を受けやすい。本実施例では、蓋組立体１０１に取り付けた捲回群３の上面と電池蓋６との間、及び捲回群３の下面と電池缶１の底面１ｄとの間に弾性部材７０を設けているので、振動、衝撃による集電タブ４３の破断を回避することができ、高い耐震性と耐衝撃性を有する。   The prismatic secondary battery 100 is assembled by inserting the wound group 3 of the lid assembly 101 into the battery can 1 and welding the battery lid 6 to the battery can 1. In the present embodiment, elastic members 70 are interposed between the winding group 3 and the battery lid 6 and between the winding group 3 and the bottom surface 1 d of the battery can 1. The winding group 3 is supported on the current collector plate 200 via the current collecting tab 43 on the winding group 3, so that the support rigidity is lower than that on the negative electrode side supported by the negative electrode metal foil exposed portion 32a. It is easy to be affected by vibration and shock within 1. In the present embodiment, elastic members 70 are provided between the upper surface of the winding group 3 attached to the lid assembly 101 and the battery lid 6, and between the lower surface of the winding group 3 and the bottom surface 1 d of the battery can 1. Therefore, breakage of the current collecting tab 43 due to vibration and impact can be avoided, and high earthquake resistance and impact resistance are achieved.

［実施例２］
図７は、実施例２にかかる集電タブの接合方法を説明する分解斜視図である。
本実施例において特徴的なことは、挟持部材３００の平板３０１を集電板２００に位置決めする位置決め手段（第一の位置決め手段）を設けたことである。挟持部材３００の平板３０１には、位置決め手段として斜面部３０１ａが設けられている。斜面部３０１ａは、平板３０１の端部を斜めに折曲することにより形成されており、挟持部材３００の平板３０１を集電板２００の接合平面部２０３に重ね合わせた際に、接続部２０２の傾斜した斜面部２０４に接面させることによって、集電板２００に対する挟持部材３００の相対的な位置決めを行うことができる。したがって、集電板２００の接合平面部２０３と挟持部材３００の平板３０１との間に集電タブ４３を挟持して溶接するときに、集電板２００と挟持部材３００の位置ずれを防止することができる。[Example 2]
FIG. 7 is an exploded perspective view for explaining a method of joining the current collecting tab according to the second embodiment.
What is characteristic in this embodiment is that positioning means (first positioning means) for positioning the flat plate 301 of the clamping member 300 on the current collector plate 200 is provided. The flat plate 301 of the clamping member 300 is provided with a slope portion 301a as positioning means. The inclined surface portion 301 a is formed by bending the end portion of the flat plate 301 obliquely, and when the flat plate 301 of the holding member 300 is overlapped with the joining flat surface portion 203 of the current collector plate 200, By making the inclined surface portion 204 contact the inclined surface portion 204, the relative positioning of the clamping member 300 with respect to the current collector plate 200 can be performed. Therefore, when the current collecting tab 43 is sandwiched and welded between the joining flat surface portion 203 of the current collecting plate 200 and the flat plate 301 of the holding member 300, the positional deviation between the current collecting plate 200 and the holding member 300 is prevented. Can do.

捲回群３の正極金属箔露出部４２ａ側の集電タブ４３は、平坦部に位置する集電タブ４３と湾曲部に位置する集電タブ４３の全てが、集電板２００と挟持部材３００との間で捲回群３の厚み方向に一括に挟持されて固定される。集電タブ４３および集電板２００および挟持部材３００は、超音波溶接等により溶接される。集電板２００と挟持部材３００は、各集電タブ４３を固定し、電気的に接続された状態に保持する。本実施例によれば、上述の実施例１の作用効果に加えて、捲回群３の厚み方向に合わせられる集電板２００と挟持部材３００との位置ずれを防止できる。   The current collecting tab 43 on the side of the positive electrode metal foil exposed portion 42a of the winding group 3 includes the current collecting tab 43 located on the flat portion and the current collecting tab 43 located on the curved portion, the current collecting plate 200 and the clamping member 300. Are clamped and fixed together in the thickness direction of the wound group 3. The current collecting tab 43, the current collecting plate 200, and the clamping member 300 are welded by ultrasonic welding or the like. The current collecting plate 200 and the clamping member 300 fix the current collecting tabs 43 and hold them in an electrically connected state. According to the present embodiment, in addition to the operational effects of the above-described first embodiment, it is possible to prevent the positional deviation between the current collector plate 200 and the sandwiching member 300 that are aligned in the thickness direction of the wound group 3.

［実施例３］
図８は、実施例３にかかる集電タブの接合方法を説明する分解斜視図、図９は、集電タブ４３を挟持した挟持部材３０２を、集電板２００に固定する方法を説明する図である。[Example 3]
FIG. 8 is an exploded perspective view for explaining a method of joining the current collecting tabs according to the third embodiment. FIG. 9 is a view for explaining a method for fixing the holding member 302 holding the current collecting tab 43 to the current collecting plate 200. It is.

本実施例において特徴的なことは、挟持部材３０２を一対の平板３１１と３１２で構成したこと、および、互いの位置決めを行う位置決め手段（第二の位置決め手段）を設けたことである。挟持部材３０２は、金属製の２枚の平板３１１と３１２を有している。平板３１１と３１２は、集電板２００の接合平面部２０３とほぼ同じ長さと幅の寸法形状を有している。正極電極４０に形成される複数の集電タブ４３は、挟持部材３０２の一対の平板３１１と３１２により、捲回群３の厚み方向に一括に挟持されて固定される。   What is characteristic in the present embodiment is that the clamping member 302 is composed of a pair of flat plates 311 and 312 and that a positioning means (second positioning means) for positioning each other is provided. The clamping member 302 has two flat plates 311 and 312 made of metal. The flat plates 311 and 312 have substantially the same length and width dimensions as the joining flat portion 203 of the current collector plate 200. The plurality of current collecting tabs 43 formed on the positive electrode 40 are clamped and fixed together in the thickness direction of the wound group 3 by a pair of flat plates 311 and 312 of the clamping member 302.

挟持部材３０２の平板３１１には、平板３１３の位置決め用の突起部（第二の位置決め手段）３１１ａが設けられている。突起部３１１ａは、平板３１１の端部を直角に折曲することにより形成されている。平板３１１と３１２は、間に集電タブ４３を挟み込んで互いに重ね合わせる際に、平板３１１の突起部３１１ａに平板３１２の端部を当接させることにより相対的な位置決めができる。次いで、挟持部材３０２を捲回群３の厚み方向に合わせて集電板２００に設置して、集電タブ４３と、集電タブ４３を挟み込む挟持部材３０２の２枚の平板３１１、３１２と、集電板２００とを超音波溶接等により溶接して一体に固定し、互いに電気的に接合する。したがって、一対の平板３１１、３１２によって互いにずれることなく集電タブ４３を厚み方向に一括に固定することができる。   The flat plate 311 of the clamping member 302 is provided with a protrusion (second positioning means) 311 a for positioning the flat plate 313. The protrusion 311a is formed by bending the end of the flat plate 311 at a right angle. The flat plates 311 and 312 can be positioned relative to each other by bringing the end of the flat plate 312 into contact with the protruding portion 311a of the flat plate 311 when the current collecting tab 43 is sandwiched therebetween. Next, the clamping member 302 is installed on the current collector plate 200 in accordance with the thickness direction of the winding group 3, and the current collecting tab 43 and the two flat plates 311 and 312 of the clamping member 302 that sandwich the current collecting tab 43, The current collector plate 200 is welded by ultrasonic welding or the like and fixed integrally, and is electrically joined to each other. Therefore, the current collecting tabs 43 can be fixed together in the thickness direction without being displaced from each other by the pair of flat plates 311 and 312.

本実施例のように、一対の平板３１１、３１２で集電タブ４３を固定したときは、集電板２００を挟持部材３０２と合わせて溶接する前に、平坦部および特に組立時に固定されない可能性の高い湾曲部に位置する集電タブ４３が確実に固定されていることを確認することができる。したがって、固定されていない集電タブ４３の座屈により生じる内部ショートを回避できる。   When the current collecting tab 43 is fixed by the pair of flat plates 311 and 312 as in the present embodiment, the flat portion and the possibility that the current collecting plate 200 may not be fixed particularly during assembly before the current collecting plate 200 is welded together with the holding member 302. It can be confirmed that the current collecting tab 43 located in the high curved portion is securely fixed. Therefore, an internal short circuit caused by buckling of the current collecting tab 43 that is not fixed can be avoided.

［実施例４］
図１０は、実施例４にかかる集電タブ４３の接合方法を説明する分解斜視図である。
本実施例では、Ｖ字型に形成されている挟持部材３０３を用いている。挟持部材３０３は、金属製の一対の平板３２１、３２２の長手方向一方側の端部３２３が予め接合された構成を有している。[Example 4]
FIG. 10 is an exploded perspective view illustrating a method of joining the current collecting tabs 43 according to the fourth embodiment.
In this embodiment, a holding member 303 formed in a V shape is used. The clamping member 303 has a configuration in which end portions 323 on one side in the longitudinal direction of a pair of metal flat plates 321 and 322 are joined in advance.

正極金属箔露出部４２ａに形成される複数の集電タブ４３は、全部が挟持部材３０３のＶ字の間に配置される。Ｖ字型に広がる挟持部材３０３を閉じることで、集電タブ４３を捲回群３の厚み方向に一括に挟持して固定する。次いで、挟持部材３０３を捲回群３の厚み方向に合わせて集電板２００に設置し、集電タブ４３と、集電タブ４３を挟み込む挟持部材３０３の平板３２１、３２２と、集電板２００とを超音波溶接等により溶接して一体に固定し、互いに電気的に接合する。   The plurality of current collecting tabs 43 formed on the positive electrode metal foil exposed portion 42 a are all disposed between the V-shapes of the holding member 303. By closing the V-shaped clamping member 303, the current collecting tabs 43 are collectively clamped and fixed in the thickness direction of the wound group 3. Next, the clamping member 303 is installed on the current collector plate 200 according to the thickness direction of the winding group 3, and the current collecting tab 43, the flat plates 321 and 322 of the clamping member 303 that sandwich the current collecting tab 43, and the current collector plate 200. Are welded together by ultrasonic welding or the like and fixed together and electrically joined together.

本実施例によれば、挟持部材３０３の一対の平板３２１と３２２とが予め一体に接合されているので、間に集電タブ４３を挟み込む際に、平板３２１と３２２との間の位置ずれを防ぐことができる。したがって、組立時に挟持部材の位置ずれにより生じる、集電タブ４３の座屈および、固定されない集電タブ４３の発生を回避できる。そして、集電板２００を挟持部材３０３と合わせて溶接する前に、平坦部および特に組立時に固定されない可能性の高い湾曲部に位置する集電タブ４３が挟持部材３０３に確実に固定されていることを確認することができる。したがって、固定されていない集電タブ４３の座屈により生じる内部ショートを回避できる。   According to the present embodiment, since the pair of flat plates 321 and 322 of the clamping member 303 are integrally joined together in advance, when the current collecting tab 43 is sandwiched between them, the positional deviation between the flat plates 321 and 322 is shifted. Can be prevented. Therefore, it is possible to avoid the buckling of the current collecting tab 43 and the occurrence of the current collecting tab 43 not being fixed, which are caused by the displacement of the clamping member during assembly. Before the current collector plate 200 and the clamping member 303 are welded together, the current collecting tab 43 located on the flat portion and the curved portion that is not likely to be fixed at the time of assembly is securely fixed to the clamping member 303. I can confirm that. Therefore, an internal short circuit caused by buckling of the current collecting tab 43 that is not fixed can be avoided.

［実施例５］
図１１は本実施例５にかかる集電タブ４３の接合方法を説明する分解斜視図である。
本実施例において特徴的なことは、挟持部材３０４が、金属製の平板３３１と、平板３３１の長手方向両側の端部で互いに接近する方向に折り返されてＶ字型に形成された２つの折り返し片部３３２、３３３を有していることである。[Example 5]
FIG. 11 is an exploded perspective view for explaining a method of joining the current collecting tab 43 according to the fifth embodiment.
What is characteristic in the present embodiment is that the holding member 304 is folded back in a direction approaching each other at the ends on both sides in the longitudinal direction of the flat plate 331 and formed into a V shape. It has the one part 332,333.

正極金属箔露出部４２ａに形成されかつ湾曲部に位置する集電タブ４３の少なくとも一部は、挟持部材３０４の平板３３１と折り返し片部３３２、３３３との間に配置される。そして、Ｖ字型に広がる折り返し片３３２、３３３を閉じることによって、集電タブ４３を捲回群３の厚み方向に一括に挟持して固定する。次いで、挟持部材３０４を捲回群３の厚み方向に合わせて集電板２００に設置し、集電タブ４３と、集電タブ４３を挟み込む挟持部材３０４と、集電板２００とを超音波溶接等により溶接して一体に固定し、互いに電気的に接合する。   At least a part of the current collecting tab 43 formed in the positive electrode metal foil exposed portion 42 a and positioned in the curved portion is disposed between the flat plate 331 and the folded piece portions 332 and 333 of the holding member 304. And the current collection tab 43 is clamped collectively in the thickness direction of the winding group 3, and is fixed by closing the folding pieces 332 and 333 which spread in V shape. Next, the clamping member 304 is installed on the current collector plate 200 in the thickness direction of the winding group 3, and the current collector tab 43, the clamp member 304 that sandwiches the current collector tab 43, and the current collector plate 200 are ultrasonically welded. They are welded together and fixed together and electrically joined together.

例えば、集電板２００と平板３１１だけで集電タブ４３を挟持して固定しようとすると、捲回群３の湾曲部に位置する集電タブ４３が外れて固定されず、集電タブの座屈による内部ショートを生じる懸念がある。これに対し、本実施例では、挟持部材３０４で集電タブ４３を固定したときは、湾曲部に位置する集電タブ４３が、平板３３１とその両端に形成される折り返し片部３３２、３３３により挟み込まれて確実に固定される。したがって、特に集電タブ４３の座屈の可能性の高い湾曲部に位置する集電タブ４３を確実に固定できる。   For example, if the current collecting tab 43 is clamped and fixed only by the current collecting plate 200 and the flat plate 311, the current collecting tab 43 located at the curved portion of the winding group 3 is not detached and fixed, and the current collecting tab seats. There is a concern of internal short circuit due to bending. On the other hand, in the present embodiment, when the current collecting tab 43 is fixed by the clamping member 304, the current collecting tab 43 positioned at the curved portion is formed by the flat plate 331 and the folded piece portions 332 and 333 formed at both ends thereof. It is pinched and fixed securely. Therefore, it is possible to reliably fix the current collecting tab 43 located at the curved portion where the current collecting tab 43 is highly likely to buckle.

［実施例６］
図１２は、実施例６にかかる集電タブの接合方法を説明する分解斜視図である。
本実施例では、予め環状に形成されている挟持部材３０５を用いている。挟持部材３０５は、一対の平板３４１、３４２の長手方向両側の端部が予め接合されて長手方向中央が互いに離間した構成を有している。[Example 6]
FIG. 12 is an exploded perspective view for explaining a method of joining current collecting tabs according to the sixth embodiment.
In this embodiment, a holding member 305 that is formed in a ring shape in advance is used. The sandwiching member 305 has a configuration in which ends of both sides in the longitudinal direction of the pair of flat plates 341 and 342 are joined in advance and the centers in the longitudinal direction are separated from each other.

正極金属箔露出部４２ａに形成される複数の集電タブ４３は、全部が一対の平板３４１と３４２の間に配置される。そして、一対の平板３４１、３４２の中央を閉じることで、集電タブ４３を捲回群３の厚み方向に一括に挟持して固定する。次いで、挟持部材３０５を捲回群３の厚み方向に合わせて集電板２００に設置し、集電タブ４３と、集電タブ４３を挟み込む挟持部材３０５の平板３４１、３４２と、集電板２００とを超音波溶接等により溶接して一体に固定し、互いに電気的に接合する。   The plurality of current collecting tabs 43 formed on the positive electrode metal foil exposed portion 42 a are all disposed between the pair of flat plates 341 and 342. Then, by closing the center of the pair of flat plates 341, 342, the current collecting tabs 43 are collectively held and fixed in the thickness direction of the wound group 3. Next, the clamping member 305 is installed on the current collector plate 200 in the thickness direction of the winding group 3, and the current collecting tab 43, the flat plates 341 and 342 of the clamping member 305 that sandwich the current collecting tab 43, and the current collector plate 200. Are welded together by ultrasonic welding or the like and fixed together and electrically joined together.

本実施例のように、予め環状に形成されている挟持部材３０５を用いて集電タブ４３を固定しているので、実施例５の場合と同様に、固定する際に湾曲部に位置する集電タブ４３が平板３４１と３４２の間に挟み込まれて確実に固定される。したがって、特に集電タブ４３の座屈の可能性の高い湾曲部に位置する集電タブ４３を確実に固定できる。   As in the present embodiment, the current collecting tab 43 is fixed using the holding member 305 formed in an annular shape in advance. Therefore, as in the case of the fifth embodiment, the current collecting tab 43 is positioned at the curved portion when being fixed. The electric tab 43 is sandwiched between the flat plates 341 and 342 and securely fixed. Therefore, it is possible to reliably fix the current collecting tab 43 located at the curved portion where the current collecting tab 43 is highly likely to buckle.

［実施例７］
図１３は、実施例７にかかる集電タブの接合方法を説明する分解斜視図である。
本実施例において特徴的なことは、正極金属箔露出部に形成される集電タブ４３の一部を集電板２００と挟持部材３０６との間に挟持し、集電板２００と挟持部材３０６との間に挟持されなかった残りの集電タブ４３を粘着テープ部材８０により集電板２００に固定した構成としたことである。[Example 7]
FIG. 13 is an exploded perspective view illustrating a method of joining current collecting tabs according to the seventh embodiment.
What is characteristic in the present embodiment is that a part of the current collecting tab 43 formed on the exposed portion of the positive electrode metal foil is sandwiched between the current collecting plate 200 and the sandwiching member 306, and the current collecting plate 200 and the sandwiching member 306 are sandwiched. The remaining current collecting tabs 43 that are not sandwiched between them are fixed to the current collecting plate 200 by the adhesive tape member 80.

正極金属箔露出部に形成される集電タブ４３は、集電板２００の接合平面部２０３と挟持部材３０６の平板３５１との間に、捲回群３の平坦部に位置する集電タブ４３の少なくとも一部、または平坦部に位置する集電タブ４３および湾曲部に位置する集電タブ４３の少なくとも一部が捲回群３の厚み方向に一括に挟持されて固定される。   The current collecting tab 43 formed on the exposed portion of the positive metal foil is a current collecting tab 43 located on the flat portion of the winding group 3 between the joining flat portion 203 of the current collecting plate 200 and the flat plate 351 of the holding member 306. At least a part of the current collecting tab 43 located on the flat part and at least a part of the current collecting tab 43 located on the curved part are clamped and fixed together in the thickness direction of the wound group 3.

固定された集電タブ４３および集電タブ４３を挟持する集電板２００および挟持部材３０６は、超音波溶接等により溶接される。集電板２００の接合平面部２０３と挟持部材３０６の平板３５１は、間に集電タブ４３を挟持した状態で互いに溶接接合され、各集電タブ４３を固定し、電気的に接続された状態に保持する。   The current collector tab 43 and the current collector plate 200 that sandwich the current collector tab 43 and the clamping member 306 are welded by ultrasonic welding or the like. The joining flat portion 203 of the current collector plate 200 and the flat plate 351 of the clamping member 306 are welded and joined together with the current collecting tabs 43 sandwiched therebetween, and the current collecting tabs 43 are fixed and electrically connected. Hold on.

図１４は、集電板２００と挟持部材３０６の間に集電タブ４３の一部を挟持して固定した状態を示す図である。集電板２００と挟持部材３０６の間に挟持されていない残りの集電タブ４３は、図１４に示す状態では、未だ、集電板２００には固定されていない。   FIG. 14 is a diagram illustrating a state in which a part of the current collecting tab 43 is sandwiched and fixed between the current collecting plate 200 and the sandwiching member 306. The remaining current collecting tabs 43 not sandwiched between the current collecting plate 200 and the holding member 306 are not yet fixed to the current collecting plate 200 in the state shown in FIG.

図１５は、残りの集電タブ４３を粘着テープ部材８０により固定した状態を示す図である。集電板２００と挟持部材３０６との間に挟持されていない残りの集電タブ４３は、絶縁部材である粘着テープ部材８０により、集電板２００に固定される。   FIG. 15 is a view showing a state where the remaining current collecting tabs 43 are fixed by the adhesive tape member 80. The remaining current collecting tabs 43 that are not sandwiched between the current collecting plate 200 and the holding member 306 are fixed to the current collecting plate 200 by an adhesive tape member 80 that is an insulating member.

本実施例によれば、集電板２００と挟持部材３０６を合わせた後に、集電板２００と挟持部材３０６により固定されていない残りの集電タブ４３を、粘着テープ部材８０により集電板２００に固定するので、特に、組立時に固定されない可能性の高い湾曲部に位置する集電タブ４３を集電板２００に確実に固定できる。したがって、集電タブ４３の座屈による電池の内部ショートを防止できる。   According to the present embodiment, after the current collector plate 200 and the sandwiching member 306 are combined, the remaining current collector tabs 43 not fixed by the current collector plate 200 and the sandwiching member 306 are attached to the current collector plate 200 by the adhesive tape member 80. In particular, the current collecting tab 43 located at the curved portion that is not likely to be fixed at the time of assembly can be reliably fixed to the current collecting plate 200. Therefore, an internal short circuit of the battery due to buckling of the current collecting tab 43 can be prevented.

以上、本発明の実施形態について詳述したが、本発明は、前記の実施形態に限定されるものではなく、特許請求の範囲に記載された本発明の精神を逸脱しない範囲で、種々の設計変更を行うことができるものである。例えば、前記した実施の形態は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施形態の構成の一部を他の実施形態の構成に置き換えることが可能であり、また、ある実施形態の構成に他の実施形態の構成を加えることも可能である。さらに、各実施形態の構成の一部について、他の構成の追加・削除・置換をすることが可能である。   Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various designs can be made without departing from the spirit of the present invention described in the claims. It can be changed. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described. Further, a part of the configuration of an embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Furthermore, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

１ 電池缶
３ 捲回群（扁平捲回群）
４２ａ 正極金属箔露出部
４３ 集電タブ
１００ 角形二次電池（二次電池）
１９０ 負極集電板
２００ 正極集電板
３００、３０２〜３０６ 挟持部材（固定部材）
３０１、３１１、３２１、３３１、３４１、３４２、３５１ 平板
３０１ａ 斜面部（第一の位置決め手段）
３１１ａ 突起部（第二の位置決め手段）1 Battery can 3 Winding group (flat wound group)
42a Positive metal foil exposed portion 43 Current collecting tab 100 Square secondary battery (secondary battery)
190 negative electrode current collector plate 200 positive electrode current collector plate 300, 302-306 clamping member (fixing member)
301, 311, 321, 331, 341, 342, 351 Flat plate 301a Slope (first positioning means)
311a Projection (second positioning means)

Claims (11)

正極電極と負極電極を重ねて扁平状に捲回して捲回軸方向両側に金属箔露出部を有する扁平捲回群と、
該扁平捲回群の金属箔露出部を前記扁平捲回群の厚み方向に一括に束ねた状態で接続される集電板を有し、
前記扁平捲回群は、少なくとも一方側の金属箔露出部が複数の集電タブを有しており、該複数の集電タブのうち前記扁平捲回群の平坦部に位置する集電タブの少なくとも一部と、前記扁平捲回群の湾曲部に位置する集電タブの少なくとも一部とが、固定部材によって前記集電板に固定されていることを特徴とする二次電池。A flat wound group in which the positive electrode and the negative electrode are overlapped and wound in a flat shape and the metal foil exposed portions are on both sides in the winding axis direction,
A current collector plate connected in a state where the metal foil exposed portion of the flat wound group is bundled together in the thickness direction of the flat wound group;
In the flat winding group, at least one side of the metal foil exposed portion has a plurality of current collecting tabs, and among the plurality of current collecting tabs, the current collecting tabs located on the flat portion of the flat winding group A secondary battery, wherein at least a part and at least a part of a current collecting tab located at a curved portion of the flat wound group are fixed to the current collecting plate by a fixing member. 前記固定部材は、前記扁平捲回群の平坦部に位置する集電タブの少なくとも一部と、前記扁平捲回群の湾曲部に位置する集電タブの少なくとも一部とを挟持して前記集電板に固定される挟持部材を有していることを特徴とする請求項１に記載の二次電池。   The fixing member sandwiches at least a part of the current collecting tab located in the flat part of the flat wound group and at least a part of the current collecting tab located in the curved part of the flat wound group. The secondary battery according to claim 1, further comprising a clamping member fixed to the electric plate. 前記挟持部材は、前記集電板に溶接される金属製の平板を有することを特徴とする請求項２に記載の二次電池。   The secondary battery according to claim 2, wherein the clamping member has a metal flat plate welded to the current collector plate. 前記挟持部材は、前記平板を前記集電板に位置決めする第一の位置決め手段を有することを特徴とする請求項３に記載の二次電池。   The secondary battery according to claim 3, wherein the clamping member includes first positioning means for positioning the flat plate on the current collector plate. 前記挟持部材は、前記扁平捲回群の平坦部に位置する集電タブの少なくとも一部と、前記扁平捲回群の湾曲部に位置する集電タブの少なくとも一部とを挟持する一対の平板を有していることを特徴とする請求項２に記載の二次電池。   The clamping member is a pair of flat plates that clamps at least a part of the current collecting tab located in the flat part of the flat wound group and at least a part of the current collecting tab located in the curved part of the flat wound group. The secondary battery according to claim 2, comprising: 前記一対の平板は、互いの位置決めを行う第二の位置決め手段を有していることを特徴とする請求項５に記載の二次電池。   The secondary battery according to claim 5, wherein the pair of flat plates has second positioning means for positioning each other. 前記一対の平板は、互いの長手方向一方側の端部が予め接合された構成を有していることを特徴とする請求項５に記載の二次電池。   The secondary battery according to claim 5, wherein the pair of flat plates has a configuration in which ends on one side in the longitudinal direction are joined in advance. 前記一対の平板は、互いの長手方向両側の端部が予め接合された構成を有していることを特徴とする請求項５に記載の二次電池。   The secondary battery according to claim 5, wherein the pair of flat plates have a configuration in which ends on both sides in the longitudinal direction are joined in advance. 前記挟持部材は、前記平板の長手方向両側の端部で互いに接近する方向に折り返された２つの折り返し片部を有することを特徴とする請求項３に記載の二次電池。   4. The secondary battery according to claim 3, wherein the clamping member has two folded pieces that are folded in directions approaching each other at both ends in the longitudinal direction of the flat plate. 5. 前記固定部材は、前記扁平捲回群の湾曲部に位置する集電タブの一部を挟持して前記集電板に固定される挟持部材と、該挟持部材によって固定されなかった残りの集電タブを前記集電板に固定する粘着テープ部材とを有することを特徴とする請求項２に記載の二次電池。   The fixing member includes a holding member that is fixed to the current collector plate by holding a part of the current collecting tab located at the curved portion of the flat wound group, and the remaining current collector that is not fixed by the holding member The secondary battery according to claim 2, further comprising an adhesive tape member that fixes a tab to the current collector plate. 前記複数の集電タブは、正極電極の正極金属箔露出部に設けられていることを特徴とする請求項１から請求項１０のいずれか一項に記載の二次電池。
The secondary battery according to any one of claims 1 to 10, wherein the plurality of current collecting tabs are provided on a positive electrode metal foil exposed portion of a positive electrode.
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