JP2009259697A - Battery and its manufacturing method - Google Patents

Battery and its manufacturing method Download PDF

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JP2009259697A
JP2009259697A JP2008109212A JP2008109212A JP2009259697A JP 2009259697 A JP2009259697 A JP 2009259697A JP 2008109212 A JP2008109212 A JP 2008109212A JP 2008109212 A JP2008109212 A JP 2008109212A JP 2009259697 A JP2009259697 A JP 2009259697A
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current collector
collector foil
foil
current
welding
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Hiroyasu Sumi
博康 角
Hiroyuki Eto
宏行 衛藤
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Toyota Motor Corp
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Toyota Motor Corp
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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

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery having structure capable of suppressing scattering of welding spatters, and to provide its manufacturing method. <P>SOLUTION: The battery 100 includes an electrode body 80 having a current collecting foil laminated part 84 formed by laminating a foil-like current collector 34, and a current collecting member 14 arranged on the current collecting foil laminated part 84 and welded to the current collecting foil laminated part 84, the current collecting foil laminated part 84 includes a current collecting foil welding part 16 welded to the current collecting member 14 and integrated with the current collecting member 14, and a current collecting foil compression part 18 compressing laminated current collecting foils 34 in the laminating direction so as to closely contact each other is formed so as to surround the periphery of the current collecting welding part 16 in the peripheral portion of the current collecting foil welding part 16 which is a part of the current collecting foil laminated part 84. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電池、詳しくは集電箔と集電部材とが溶接により接合されている電池とその製造方法に関する。   The present invention relates to a battery, and more particularly to a battery in which a current collector foil and a current collector are joined by welding and a method for manufacturing the same.

種々の電池の中には渦巻き状構造を有する電極体（捲回電極体）を備えた電池がある。電極体を渦巻き状構造とすることにより正負極の反応面積を大きくすることができ、これによってエネルギー密度を増大して高出力が可能となる。このような捲回電極体を備えた電池は高出力が得られる電源として車両搭載用電源、或いはパソコンおよび携帯端末の電源として重要性が益々高まっている。この種の捲回電極体は一般に長尺シート状の集電箔表面に電極活物質層が形成された正負の電極シートを捲回することにより形成されている。正負の電極シートには集電箔表面に活物質層が形成されていない活物質層非形成部（集電箔露出部分）が幅方向の一端に沿って設けられている。このような電極シートを捲回すると図８に示す通りである。   Among various types of batteries, there is a battery provided with an electrode body (wound electrode body) having a spiral structure. By making the electrode body have a spiral structure, the reaction area of the positive and negative electrodes can be increased, thereby increasing the energy density and enabling high output. A battery equipped with such a wound electrode body is becoming increasingly important as a power source for mounting on a vehicle or a power source for a personal computer and a portable terminal as a power source capable of obtaining a high output. This type of wound electrode body is generally formed by winding a positive and negative electrode sheet having an electrode active material layer formed on the surface of a long sheet-shaped current collector foil. In the positive and negative electrode sheets, an active material layer non-formation portion (current collector foil exposed portion) in which no active material layer is formed on the surface of the current collector foil is provided along one end in the width direction. When such an electrode sheet is wound, it is as shown in FIG.

図８に示すように捲回電極体９０の軸方向端部には活物質層非形成部（集電箔露出部分）が捲回されて積層された集電箔積層部９２が形成される。かかる集電箔積層部９２には集電部材９４ａが取り付けられ該集電部材９４ａを介して電極端子（図示せず）と電気的に接続される。上記集電部材９４ａと集電箔積層部９２とは、例えば抵抗溶接により接合され得る。すなわち、集電部材９４ａと集電箔積層部９２とを接触させ、該接触部を加圧しながら電流を流し、その抵抗熱によって両部材を局所的に溶融して一体化する。かかる抵抗溶接によれば、歪みが少ない溶接品質の良好な溶接部を非常に短い時間で形成することができる。なお、この種の従来技術としては例えば特許文献１が挙げられる。また、抵抗溶接に関する従来技術として例えば特許文献２が開示されている。
特開２００７−１８９６８号公報 特開２０００−３３４５７３号公報 As shown in FIG. 8, a current collector foil laminated portion 92 in which an active material layer non-formation portion (current collector foil exposed portion) is wound and laminated is formed at the axial end portion of the wound electrode body 90. A current collecting member 94a is attached to the current collecting foil laminated portion 92 and is electrically connected to an electrode terminal (not shown) via the current collecting member 94a. The current collecting member 94a and the current collector foil laminated portion 92 can be joined by, for example, resistance welding. That is, the current collecting member 94a and the current collecting foil laminated portion 92 are brought into contact with each other, an electric current is applied while pressurizing the contact portion, and both members are locally melted and integrated by the resistance heat. According to such resistance welding, it is possible to form a welded portion with less distortion and good welding quality in a very short time. As this type of prior art, for example, Patent Document 1 is cited. Further, for example, Patent Document 2 is disclosed as a conventional technique related to resistance welding.
JP 2007-18968 A JP 2000-334573 A

しかしながら、この種の抵抗溶接では溶接の際に溶接スパッタ等（溶接時に溶融して火花状に飛散する金属粒等）が発生し易いという問題がある。溶接スパッタ等は溶接部周辺に飛散して溶接品質に悪影響を及ぼす。或いは、飛散した溶接スパッタが集電箔の隙間を介して捲回電極体内に入り込むと種々の不具合（例えば電極体内部の微小短絡による電池性能の悪化など）が生じ得る要因ともなり得る。   However, in this type of resistance welding, there is a problem that welding spatter and the like (metal particles that melt during the welding and scatter in a spark shape) are likely to occur. Weld spatter or the like is scattered around the weld and adversely affects weld quality. Alternatively, when the scattered welding spatter enters the wound electrode body through the gap of the current collector foil, it may be a factor that may cause various problems (for example, deterioration of battery performance due to a micro short circuit inside the electrode body).

本発明はかかる点に鑑みてなされたものであり、その主な目的は、電池製造過程において溶接スパッタの飛散が抑制される構造を備えた電池とその製造方法を提供することである。   This invention is made | formed in view of this point, The main objective is to provide the battery provided with the structure where scattering of welding spatter is suppressed in a battery manufacturing process, and its manufacturing method.

本発明によって提供される電池は、箔状の集電体が積層した構成の集電箔積層部を有する電極体と、上記集電箔積層部上に積層され、該集電箔積層部に溶接された集電部材とを備える。上記集電箔積層部は、上記集電部材に溶接されて該集電部材と一体となった集電箔溶接部を有している。そして、上記集電箔積層部の一部分であって上記集電箔溶接部の周辺部分には、上記積層された集電箔が互いに密接した状態となるように積層方向に圧縮された集電箔圧縮部が上記集電箔溶接部の周りを囲むように形成されている。   The battery provided by the present invention includes an electrode body having a current collector foil laminated portion having a configuration in which a foil-shaped current collector is laminated, and the current collector foil laminated portion, and is welded to the current collector foil laminated portion. Current collector. The current collector foil laminated portion has a current collector foil welded portion welded to the current collector and integrated with the current collector. The current collector foil is compressed in the stacking direction so that the stacked current collector foils are in close contact with each other at a portion of the current collector foil laminated portion and around the current collector foil welded portion. The compression part is formed so as to surround the current collector foil welded part.

本発明の構成によれば、集電箔溶接部の周囲を集電箔圧縮部（典型的には、積層部分を構成している各集電箔が隙間なく互いに接している集電箔密集部分）で塞いでいるため、上記溶接時に集電箔を溶接する部位（即ち上記集電箔溶接部が形成される部位）から発生し得る溶接スパッタ等をその周囲に設けられた集電箔圧縮部で囲まれた所定の領域内に閉じ込める（即ち溶接スパッタが集電箔積層部を越えて電極体の内方に飛散するのを防止する）ことができる。これにより、溶接スパッタが溶接部周辺に飛散することによる悪影響（例えば溶接スパッタが積層された集電箔の隙間を介して電極体内部に入り込むことによる内部短絡など）を回避することができる。このようにして得られた本発明の電池では、電池製造過程において溶接スパッタの飛散が抑制されており、結果、良好な電池性能を有し且つ高い信頼性を実現することができる。   According to the configuration of the present invention, the current collector foil welded portion is surrounded by the current collector foil compressed portion (typically, the current collector foil dense portion in which the current collector foils constituting the laminated portion are in contact with each other without a gap. Current collector foil compression part provided around the welding spatter that can be generated from the part where the current collector foil is welded at the time of welding (that is, the part where the current collector foil weld part is formed). Can be confined in a predetermined region surrounded by (that is, welding spatter can be prevented from splashing inward of the electrode body beyond the collector foil laminated portion). Thereby, the bad influence (for example, the internal short circuit by entering the inside of an electrode body through the clearance gap between the current collector foils in which the welding sputter | spatter was laminated | stacked) by the welding spatter scattered around a welding part can be avoided. In the battery of the present invention thus obtained, scattering of welding spatter is suppressed in the battery manufacturing process, and as a result, good battery performance and high reliability can be realized.

ここで開示される電池のある好適な一態様において、上記集電箔積層部の一部を積層方向に押し付け得る押圧手段を備えている。そして、上記集電箔圧縮部は、該押圧手段によって上記積層方向に押し付けられた状態で形成されている。   In a preferred aspect of the battery disclosed herein, the battery includes a pressing unit capable of pressing a part of the current collector foil stacking portion in the stacking direction. And the said collector foil compression part is formed in the state pressed in the said lamination direction by this press means.

かかる構成によれば、電池構築時において上記集電箔圧縮部を容易に形成することができる。なお、上記押圧手段は、上記集電部材に一体に形成されたものであることが好ましい。これにより、別途押圧手段（押圧部材）を用意する必要がないので、集電構造が複雑になるのを回避できる。   According to this configuration, the current collector foil compression part can be easily formed at the time of battery construction. In addition, it is preferable that the said press means is integrally formed in the said current collection member. Thereby, since it is not necessary to prepare a separate pressing means (pressing member), it can avoid that a current collection structure becomes complicated.

ここで開示される電池のある好適な一態様において、上記押圧手段は、上記集電箔積層部を積層方向の両側から挟み込む一対の突起である。そして、上記集電箔圧縮部は、上記突起の押圧により上記積層された集電箔が積層方向の両側から積層面の中央付近に寄せ集められるようにして形成されている。   In a preferred aspect of the battery disclosed herein, the pressing means is a pair of protrusions that sandwich the current collector foil laminate from both sides in the lamination direction. The current collector foil compression section is formed such that the stacked current collector foils are gathered from both sides in the stacking direction to the vicinity of the center of the stack surface by pressing the protrusions.

かかる構成によれば、積層された集電箔（特に積層方向の最外側に位置する集電箔）を大きく屈曲させることなく集箔（圧縮）することができるので、集電箔圧縮部の形成が容易になるとともに集電箔の破損（典型的には箔破れ）を回避することができる。   According to such a configuration, it is possible to collect (compress) the laminated current collector foils (especially, the current collector foil located on the outermost side in the laminating direction) without greatly bending, so that the current collector foil compression part is formed. Is easy, and damage to the current collector foil (typically foil breakage) can be avoided.

ここで開示される電池のある好適な一態様において、上記集電部材は、上記押圧手段を構成する押圧突起部であって、上記集電箔溶接部の周辺部分に設けられた押圧突起部と、上記集電箔溶接部に溶接される溶接突出部であって上記押圧突起部よりも外方に突出した（即ち集電部材の基部からみて押圧突起部よりも高く突出した）溶接突出部とを有している。このような構成の押圧突起部は、上記押圧手段として好ましい。   In a preferred aspect of the battery disclosed herein, the current collecting member is a pressing protrusion that constitutes the pressing means, and a pressing protrusion provided in a peripheral portion of the current collector foil welded portion; A weld protrusion that is welded to the current collector foil weld and protrudes outward from the pressing protrusion (that is, protrudes higher than the pressing protrusion as viewed from the base of the current collector); have. A pressing protrusion having such a configuration is preferable as the pressing means.

また、ここで開示される電池の他の好適な一態様において、上記集電部材は、上記集電箔溶接部に溶接される溶接突出部を有しており、該溶接突出部には、上記集電箔溶接部に溶接されている頂部と、該頂部の周縁部であって上記押圧手段を構成する湾曲面からなる湾曲周縁部とが形成されている。   Further, in another preferable aspect of the battery disclosed herein, the current collecting member has a weld protrusion to be welded to the current collector foil weld, and the weld protrusion includes A top portion welded to the current collector foil welded portion, and a curved peripheral portion that is a peripheral portion of the top portion and is formed of a curved surface that constitutes the pressing means are formed.

かかる構成によれば、集電箔圧縮部を集電箔溶接部に隣接するように形成することができる。すなわち、集電箔溶接部周辺の集電箔の形状（湾曲形状）に対応して、溶接部位である上記頂部の周縁部表面が湾曲面となっていることにより、該湾曲面（押圧手段）によって集電箔溶接部周辺の集電箔を広範囲に押し付けて集電箔同士を密接に集約させる（くっつける）ことができる。そのため、集電箔溶接部の外縁部分を集電箔圧縮部で構成することができる。このように集電箔圧縮部が集電箔溶接部に隣接して形成されることにより、集電箔溶接部から生じた溶接スパッタを該溶接部にそのまま閉じ込めることができる。そのため、溶接スパッタが溶接部近辺に飛散することによる悪影響（例えば溶接品質の低下等）を回避することができ、溶接強度および通電性に優れた電池を提供することができる。   According to such a configuration, the current collector foil compression part can be formed adjacent to the current collector foil welded part. That is, the peripheral surface of the top portion, which is a welded portion, is a curved surface corresponding to the shape (curved shape) of the current collector foil around the welded foil welded portion, whereby the curved surface (pressing means). Therefore, the current collector foils around the current collector foil welded portion can be pressed in a wide range and the current collector foils can be closely aggregated (attached). Therefore, the outer edge part of the current collector foil welded portion can be constituted by the current collector foil compressed portion. Thus, the current collector foil compression part is formed adjacent to the current collector foil welded part, so that the welding spatter generated from the current collector foil welded part can be confined in the welded part as it is. For this reason, it is possible to avoid an adverse effect (for example, a reduction in welding quality) caused by welding spatter scattering near the welded portion, and to provide a battery having excellent welding strength and electrical conductivity.

また、本発明は、箔状の集電体が積層した構成の集電箔積層部を有する電極体と、上記集電箔積層部上に配置され、該集電箔積層部に溶接された集電部材とを備えた電池の製造方法を提供する。   Further, the present invention provides an electrode body having a current collector foil laminated portion having a structure in which a foil-shaped current collector is laminated, and a collector disposed on the current collector foil laminated portion and welded to the current collector foil laminated portion. Provided is a method for manufacturing a battery including an electric member.

この製造方法は、上記集電箔積層部と上記集電部材とを接触させ、該集電箔積層部の一部と該集電部材の一部とを溶接してなる集電箔溶接部を形成する工程、および、上記溶接が完了する前に（典型的には集電部材と集電箔積層部との溶融が完了する前に）上記集電箔溶接部が形成される部分の周辺において、上記集電箔積層部の一部分を積層方向に押し付けて、該積層された集電箔が互いに密接した状態となるように圧縮された集電箔圧縮部を形成する工程を包含する。ここで、上記集電箔圧縮部は、上記集電箔溶接部が形成される部分を囲むように形成され且つ上記溶接時において溶融させた上記接触部分から発生し得る溶接スパッタを該集電箔圧縮部で囲まれた領域内に閉じ込めるように形成される。   In this manufacturing method, a current collector foil welded portion formed by bringing the current collector foil laminated portion into contact with the current collecting member and welding a part of the current collector foil laminated portion and a part of the current collector member is provided. And in the vicinity of the portion where the current collector foil weld is formed before the welding is completed (typically, before the melting of the current collector and the current collector foil laminate is completed). And a step of pressing a part of the current collector foil laminated portion in the laminating direction to form a current collector foil compressed portion compressed so that the laminated current collector foils are in close contact with each other. Here, the current collector foil compression part is formed so as to surround a part where the current collector foil welded part is formed, and weld collector spatter that can be generated from the contact part melted at the time of the welding. It is formed so as to be confined in a region surrounded by the compression portion.

かかる製造方法によれば、集電箔圧縮部で囲まれた領域内に溶接スパッタを閉じ込める（即ち溶接スパッタが集電箔積層部を越えて電極体の内方に飛散するのを防止する）ことができ、該溶接スパッタの飛散を抑制しつつ集電部材を集電箔に溶接することができる。これにより、溶接スパッタが溶接部周辺に飛散することによる悪影響（例えば溶接スパッタが積層された集電箔の隙間を介して電極部内部に入り込むことによる内部短絡など）を回避することができ、良好な電池性能を有し、且つ、信頼性が高い電池を製造することができる。   According to such a manufacturing method, the welding spatter is confined in the region surrounded by the current collector foil compression portion (that is, the welding spatter is prevented from scattering inward of the electrode body beyond the current collector foil laminated portion). The current collecting member can be welded to the current collector foil while suppressing scattering of the welding spatter. As a result, adverse effects caused by welding spatter scattering around the welded part (for example, an internal short circuit caused by entering the inside of the electrode part through the gap of the current collector foil on which the welded spatter is laminated) can be avoided. A battery having high battery performance and high reliability can be manufactured.

ここで開示される製造方法の好ましい一態様では、上記集電箔圧縮部は、上記積層された集電箔を積層方向の両側から積層面の中央付近に寄せ集めるようにして形成される。かかる方法によれば、積層された集電箔（特に積層方向の最外側に位置する集電箔）を大きく屈曲させることなく集箔（圧縮）することができるので、上記圧縮作業が容易になるとともに、集電箔の破損（典型的には箔破れ）を確実に回避することができる。   In a preferred embodiment of the manufacturing method disclosed herein, the current collector foil compression section is formed so that the stacked current collector foils are gathered from both sides in the stacking direction to near the center of the stacking surface. According to such a method, the laminated current collecting foil (especially the current collecting foil located on the outermost side in the laminating direction) can be collected (compressed) without greatly bending, and thus the above-described compression work is facilitated. At the same time, breakage of the current collector foil (typically foil breakage) can be reliably avoided.

ここで開示される製造方法の好ましい一態様では、集電部材として、上記集電箔積層部の一部分を積層方向に押し付ける押圧手段を備える集電部材を使用する。これにより、別途押圧手段（押圧部材）を用意することなく目的の電池を製造することができる。   In a preferable aspect of the manufacturing method disclosed herein, a current collecting member including a pressing unit that presses a part of the current collecting foil laminated portion in the laminating direction is used as the current collecting member. Thereby, the target battery can be manufactured without preparing a separate pressing means (pressing member).

ここで開示される製造方法の好ましい一態様では、上記押圧手段は、上記集電部材に一体に形成された押圧突起部である。そして、上記押圧突起部は、上記溶接を行う際に上記集電箔積層部を積層方向に押し付けるように構成されている。かかる方法によれば、溶接工程時に集電箔圧縮部もまた形成することができ、溶接スパッタの飛散を防止し得る電池を効率良く製造することができる。   In a preferred aspect of the manufacturing method disclosed herein, the pressing means is a pressing protrusion formed integrally with the current collecting member. And the said press protrusion part is comprised so that the said current collection foil laminated part may be pressed on the lamination direction, when performing the said welding. According to this method, the current collector foil compression part can also be formed during the welding process, and a battery that can prevent welding spatter from scattering can be efficiently manufactured.

ここで開示される製造方法の好ましい一態様では、上記集電部材は、上記集電箔積層部に溶接される部位であって上記押圧突起部よりも外方に突出した（即ち集電部材の基部からみて押圧突起部よりも高く突出した）溶接突出部を有している。そして、溶接を行う際は、上記溶接突出部と上記集電箔積層部とが接触するように配置される。このように溶接突出部を押圧突起部よりも高くして上記集電箔積層部と接触させることにより、該溶接突出部を局所的に加熱することができる。例えば抵抗溶接の場合、押圧突起部が集電箔積層部に触れたとしても、溶接突出部の方が面圧は高くなるため、該溶接突出部に電流を集中して流すことができ、押圧突起部への電流分流を防止することができる。これにより、押圧突起部と集電箔積層部との意図しない溶接（延いてはそれを起因とする溶接スパッタの飛散）を容易に防止することができる。なお、押圧突起部への電流分流を防止するために、押圧突起部に絶縁処理を施してもよい。すなわち、押圧突起部の表面に、例えばエナメルその他の樹脂コーティング等の表面絶縁処理を施すことにより、押圧突起部と集電箔積層部との意図しない溶接を防止することができる。   In a preferred aspect of the manufacturing method disclosed herein, the current collecting member is a portion welded to the current collector foil laminated portion and protrudes outward from the pressing protrusion (that is, the current collecting member). It has a welding protrusion (which protrudes higher than the pressing protrusion when viewed from the base). And when welding, it arrange | positions so that the said welding protrusion part and the said current collection foil lamination | stacking part may contact. Thus, the welding protrusion can be heated locally by making the welding protrusion higher than the pressing protrusion and bringing it into contact with the current collector foil laminate. For example, in the case of resistance welding, even if the pressing protrusion touches the current collector foil laminate, the surface pressure of the welding protrusion is higher, so that the current can be concentrated and flowed to the welding protrusion. Current shunting to the protrusion can be prevented. This makes it possible to easily prevent unintentional welding between the pressing protrusion and the current collector foil stacking (and hence spattering of welding spatter resulting from it). In addition, in order to prevent current shunting to the pressing protrusion, the pressing protrusion may be insulated. In other words, unintentional welding between the pressing protrusion and the current collector foil laminate can be prevented by subjecting the surface of the pressing protrusion to surface insulation treatment such as enamel or other resin coating.

以下、図面を参照しながら本発明による実施の形態を説明する。以下の図面においては、同じ作用を奏する部材・部位には同じ符号を付して説明している。なお、以下、角形リチウムイオン二次電池１００を例にして本発明の電池の構造について詳細に説明するが、本発明をかかる実施形態に記載されたものに限定することを意図したものではない。また各図における寸法関係（長さ、幅、厚さ等）は実際の寸法関係を反映するものではない。   Embodiments of the present invention will be described below with reference to the drawings. In the following drawings, members / parts having the same action are described with the same reference numerals. Hereinafter, the structure of the battery of the present invention will be described in detail by taking the prismatic lithium ion secondary battery 100 as an example, but the present invention is not intended to be limited to the one described in the embodiment. Further, the dimensional relationships (length, width, thickness, etc.) in each figure do not reflect actual dimensional relationships.

図１を参照しながら電池１００の構成について説明する。図１は本実施形態に係るリチウムイオン二次電池の外観を模式的に示す正面図である。ここで開示されるリチウムイオン二次電池１００は、電極体８０と、該電極体８０を収容する容器５０とを備えている。   The configuration of the battery 100 will be described with reference to FIG. FIG. 1 is a front view schematically showing the external appearance of the lithium ion secondary battery according to the present embodiment. The lithium ion secondary battery 100 disclosed herein includes an electrode body 80 and a container 50 that houses the electrode body 80.

電極体８０は、典型的なリチウムイオン電池に装備される電極体と同様、所定の電池構成材料（正負極それぞれの活物質、正負極それぞれの集電体、セパレータ等）から構成されている。ここでは電極体８０として後述する扁平形状の捲回電極体８０が用いられている。容器５０は、上記扁平形状の捲回電極体８０を収容し得る形状（図示した例では箱型）を有する。また、容器５０の材質は、典型的な単電池で使用されるものと同じであればよく特に制限はないが、電池自体の軽量化の観点から、例えば薄い金属製或いは合成樹脂製の容器が使用され得る。   The electrode body 80 is made of a predetermined battery constituent material (active material for each positive and negative electrode, current collector for each positive and negative electrode, separator, etc.) as in the case of an electrode body equipped in a typical lithium ion battery. Here, a flat wound electrode body 80 which will be described later is used as the electrode body 80. The container 50 has a shape (box shape in the illustrated example) that can accommodate the flat wound electrode body 80. The material of the container 50 is not particularly limited as long as it is the same as that used for a typical unit cell. However, from the viewpoint of reducing the weight of the battery itself, for example, a thin metal or synthetic resin container is used. Can be used.

次に、図２も加えて、扁平形状の捲回電極体８０の構成について説明する。図２に示すように、捲回電極体８０はシート状電極体２０を捲回することによって形成されている。シート状電極体２０は、捲回電極体を組み立てる前段階における長尺状（帯状）のシート構造を有している。シート状電極体２０は、典型的な捲回電極体と同様に正極シート３０と負極シート４０を計２枚のセパレータシート２２と共に積層して形成されている。   Next, the configuration of the flat wound electrode body 80 will be described with reference to FIG. As shown in FIG. 2, the wound electrode body 80 is formed by winding the sheet electrode body 20. The sheet-like electrode body 20 has a long (band-like) sheet structure in a stage before assembling the wound electrode body. The sheet-like electrode body 20 is formed by laminating a positive electrode sheet 30 and a negative electrode sheet 40 together with a total of two separator sheets 22 in the same manner as a typical wound electrode body.

正極シート３０は、長尺シート状の箔状の正極集電体（以下「正極集電箔３４」と称する）の両面に電池用正極活物質層３２が付着されて形成されている。ただし、正極活物質層３２はシート状電極体２０の幅方向の端辺に沿う一方の側縁（図では上側の側縁部分）には付着されず、正極集電体３４を一定の幅にて露出させた正極活物質層非形成部３６が形成されている。負極シート４０も正極シート３０と同様に、長尺シート状の箔状の負極集電体（以下「負極集電箔４４」と称する）の両面に電池用負極活物質層４２が付着されて形成されている。ただし、負極活物質層４２はシート状電極体２０の幅方向の端辺に沿う一方の側縁（図では下側の側縁部分）には付着されず、負極集電体４４を一定の幅にて露出させた負極活物質層非形成部４６が形成されている。なお、正極シート３０および負極シート４０を構成する材料自体は、従来のリチウムイオン電池の電極体と同様でよく、特に制限はない。例えば、正極集電箔３４にはアルミニウム箔（本実施形態）その他の正極に適する金属箔が好適に使用される。負極集電箔４４には銅箔（本実施形態）その他の負極に適する金属箔が好適に使用される。   The positive electrode sheet 30 is formed by attaching a positive electrode active material layer 32 for a battery to both surfaces of a long sheet-like foil-shaped positive electrode current collector (hereinafter referred to as “positive electrode current collector foil 34”). However, the positive electrode active material layer 32 is not attached to one side edge (upper side edge portion in the figure) along the edge in the width direction of the sheet-like electrode body 20, and the positive electrode current collector 34 has a constant width. The exposed positive electrode active material layer non-forming portion 36 is formed. Similarly to the positive electrode sheet 30, the negative electrode sheet 40 is formed by attaching a negative electrode active material layer 42 for a battery to both surfaces of a long sheet-like foil-shaped negative electrode current collector (hereinafter referred to as “negative electrode current collector foil 44”). Has been. However, the negative electrode active material layer 42 is not attached to one side edge (the lower side edge portion in the drawing) along the edge in the width direction of the sheet-like electrode body 20, and the negative electrode current collector 44 has a certain width. A negative electrode active material layer non-formation portion 46 exposed at is formed. In addition, the material itself which comprises the positive electrode sheet 30 and the negative electrode sheet 40 may be the same as that of the electrode body of the conventional lithium ion battery, and there is no restriction | limiting in particular. For example, the positive electrode current collector foil 34 is preferably an aluminum foil (this embodiment) or other metal foil suitable for the positive electrode. For the negative electrode current collector foil 44, a copper foil (this embodiment) or other metal foil suitable for the negative electrode is preferably used.

捲回電極体８０を構築する際には、正極シート３０と負極シート４０とをセパレータシート２２を介して積層したシート状電極体２０を用意する。このとき、セパレータシート２２は正極シート３０の正極活物質層非形成部（正極集電箔３４の露出部分）３６が外方にはみ出るように（即ち正極活物質層３２とセパレータシート２２とが対向するように）重ね合せられる。負極シート４０も正極シート３０と同様に積層され、負極活物質層非形成部（負極集電箔４４の露出部分）４６がセパレータシート２２から外方にはみ出るように（即ち負極活物質層４２とセパレータシート２２とが対向するように）重ね合せられる。かかるシート状電極体２０を捲回し、次いで得られた捲回体を側面方向から押しつぶして拉げさせることによって扁平形状の捲回電極体８０が得られる。   When constructing the wound electrode body 80, a sheet-like electrode body 20 in which the positive electrode sheet 30 and the negative electrode sheet 40 are laminated via the separator sheet 22 is prepared. At this time, the separator sheet 22 is such that the positive electrode active material layer non-formation portion (exposed portion of the positive electrode current collector foil 34) 36 of the positive electrode sheet 30 protrudes outward (that is, the positive electrode active material layer 32 and the separator sheet 22 face each other). To be superimposed). The negative electrode sheet 40 is also laminated in the same manner as the positive electrode sheet 30 so that the negative electrode active material layer non-formation part (exposed part of the negative electrode current collector foil 44) 46 protrudes outward from the separator sheet 22 (that is, the negative electrode active material layer 42 and The separator sheet 22 is overlapped with each other. A flat wound electrode body 80 is obtained by winding the sheet-like electrode body 20 and then crushing the obtained wound body from the side surface direction.

捲回電極体８０の捲回軸方向における中央部分には、捲回コア部分８２（即ち正極シート３０の正極活物質層３２と負極シート４０の負極活物質層４２とセパレータシート２２とが密に積層された部分）が形成される。また、捲回電極体８０の捲回軸方向の一方の端部には、正極活物質層非形成部３６（正極集電箔３４の露出部分）が捲回されて積層された正極集電箔積層部８４（箔状の正極集電体が積層した構成の正極集電箔積層部）が形成される。そして、捲回電極体８０の捲回軸方向の他方の端部には、負極活物質層非形成部４６（負極集電箔４４の露出部分）が捲回されて積層された負極集電箔積層部８６（箔状の負極集電体が積層した構成の負極集電箔積層部）が形成される。   A wound core portion 82 (that is, the positive electrode active material layer 32 of the positive electrode sheet 30, the negative electrode active material layer 42 of the negative electrode sheet 40, and the separator sheet 22 is densely arranged in the central portion of the wound electrode body 80 in the winding axis direction. Laminated portions) are formed. Further, a positive electrode current collector foil in which a positive electrode active material layer non-formation part 36 (exposed part of the positive electrode current collector foil 34) is wound and laminated at one end in the winding axis direction of the wound electrode body 80. A laminated portion 84 (a positive current collector foil laminated portion having a configuration in which foil-shaped positive electrode current collectors are laminated) is formed. A negative electrode current collector foil in which a negative electrode active material layer non-formation part 46 (exposed part of the negative electrode current collector foil 44) is wound and laminated at the other end in the winding axis direction of the wound electrode body 80. A laminated portion 86 (a negative electrode current collector foil laminated portion having a configuration in which foil-shaped negative electrode current collectors are laminated) is formed.

このようにして得られた捲回電極体８０は、図１に示すように捲回軸方向が水平方向（図では左右方向）となるように容器５０に収容される。そして、正極集電箔積層部８４および負極集電箔積層部８６には、それぞれ正極集電部材１４および負極集電部材１１が接合される。この実施形態では、正極集電部材１４は、正極集電箔積層部８４の外面に沿うように延びたアルミニウム製の板状部材である。正極集電部材１４は、正極集電箔積層部８４の上に配置されて溶接されている。一方、負極集電部材１１は、負極集電箔積層部８６の外面に沿うように延びた銅製の板状部材である。負極集電部材１１は、負極集電箔積層部８６の上に配置されて溶接されている。   The wound electrode body 80 obtained in this way is accommodated in the container 50 so that the winding axis direction is the horizontal direction (left-right direction in the figure) as shown in FIG. The positive electrode current collector foil laminate 84 and the negative electrode current collector foil laminate 86 are joined to the positive electrode current collector 14 and the negative electrode current collector 11, respectively. In this embodiment, the positive electrode current collector 14 is an aluminum plate-like member that extends along the outer surface of the positive electrode current collector foil laminate 84. The positive electrode current collecting member 14 is disposed and welded on the positive electrode current collector foil laminated portion 84. On the other hand, the negative electrode current collecting member 11 is a copper plate-like member extending along the outer surface of the negative electrode current collecting foil laminated portion 86. The negative electrode current collector 11 is disposed and welded on the negative electrode current collector foil laminated portion 86.

上記溶接手段は、典型的な集電部材の溶接に使用されるものと同じであればよく特に制限はないが、例えば抵抗溶接（好ましくはスポット溶接）により行うことができる。抵抗溶接では、歪みが少ない溶接品質の良好な溶接部を非常に短い時間で形成することができる。なお、正極集電部材１４および負極集電部材１１は、それぞれ正極端子５６ａおよび負極端子５６ｂに電気的に接続される。この例では正極端子５６ａおよび負極端子５６ｂはガスケット５４ａ、５４ｂを介して容器５０の蓋体５２に取り付けられている。   The welding means is not particularly limited as long as it is the same as that used for welding a typical current collecting member. For example, resistance welding (preferably spot welding) can be used. In resistance welding, it is possible to form a welded portion with less distortion and good welding quality in a very short time. The positive electrode current collecting member 14 and the negative electrode current collecting member 11 are electrically connected to the positive electrode terminal 56a and the negative electrode terminal 56b, respectively. In this example, the positive electrode terminal 56a and the negative electrode terminal 56b are attached to the lid body 52 of the container 50 via gaskets 54a and 54b.

次に、図３および図４を参照しながら、集電部材の溶接部分の構成について説明する。図３は正極集電部材の溶接部分周辺を拡大した要部拡大図であり、図４は図３のＩＶ−ＩＶ断面を模式的に示す要部断面図である。なお、以下では主として正極側の集電部材の溶接部分について説明するが、本発明の構成は正負の電極に関係なく適用可能なものである。   Next, the structure of the welding part of a current collection member is demonstrated, referring FIG. 3 and FIG. FIG. 3 is an enlarged view of a main part in which the periphery of the welded portion of the positive electrode current collecting member is enlarged, and FIG. 4 is a main part cross-sectional view schematically showing the IV-IV cross section of FIG. In the following, the welded portion of the current collecting member on the positive electrode side will be mainly described, but the configuration of the present invention can be applied regardless of the positive and negative electrodes.

正極集電箔積層部８４は、図４に示すように、負極シート及びセパレータシートが積層されていない分だけ捲回コア部分８２よりも厚みが小さくなり、それゆえに積層された各正極集電箔３４の間には隙間３５が生じがちとなる。そのため、正極集電部材１４と正極集電箔積層部８４とを溶接（例えば抵抗溶接）すると、該隙間３５を介して細かい溶接スパッタや塵等が捲回電極体８０内（特に捲回コア部分８２）に混入する虞がある。これに対し、この実施形態では、図３及び図４に示すように、正極集電部材１４の一部と正極集電箔積層部８４の一部とが一体となった集電箔溶接部１６を囲むように集電箔圧縮部（典型的には積層部分を構成している各集電箔３４が隙間なく互いに接している集電箔密集部分）１８を形成した上で上記溶接を行うことにより、該溶接部１６から生じた溶接スパッタ６０等を該溶接部近傍に閉じ込めるように構成されている。そのため、溶接スパッタ６０等が捲回電極体８０（特に捲回コア部分８２）内へ混入する事態を回避することができる。以下、詳細に説明する。   As shown in FIG. 4, the positive electrode current collector foil stacking portion 84 has a thickness smaller than that of the wound core portion 82 because the negative electrode sheet and the separator sheet are not stacked. A gap 35 tends to occur between 34. Therefore, when the positive electrode current collecting member 14 and the positive electrode current collector foil laminated portion 84 are welded (for example, resistance welding), fine welding spatter, dust, etc. are generated in the wound electrode body 80 (particularly, the wound core portion) through the gap 35. 82). In contrast, in this embodiment, as shown in FIGS. 3 and 4, the current collector foil welded portion 16 in which a part of the positive electrode current collector 14 and a part of the positive electrode current collector foil laminated portion 84 are integrated. Forming the current collector foil compression part (typically the current collector foil dense part where the current collector foils 34 constituting the laminated part are in contact with each other without gaps) 18 so as to surround Thus, the welding spatter 60 and the like generated from the welded portion 16 are confined in the vicinity of the welded portion. Therefore, it is possible to avoid a situation in which welding spatter 60 or the like is mixed into wound electrode body 80 (particularly wound core portion 82). This will be described in detail below.

図４に示すように、集電箔積層部８４は、集電部材１４と溶接（ここでは抵抗溶接）されて一体となった集電箔溶接部１６を有している。この実施形態では、集電部材１４に加えて集電補助部材（アルミニウム製の板状部材）１７が集電箔積層部８４に溶接され、該集電部材１４と集電箔積層部８４と集電補助部材１７とが一体となった集電箔溶接部１６が形成されている。上記集電箔積層部８４の一部であって上記集電箔溶接部１６の周辺部分には、積層された集電箔３４が互いに密接した状態となるように積層方向に圧縮された集電箔圧縮部１８が形成されている。そして、該集電箔圧縮部１８は、集電箔溶接部１６の周りを囲むように設けられている。この実施形態では、集電箔圧縮部１８は、積層された集電箔３４が積層方向の両側から積層面の中央付近に寄せ集められるようにして圧縮（集箔）され、相互の集電箔３４の間に隙間がない状態となっている。また、この実施形態では、図３に示すように、集電箔圧縮部１８は、集電箔溶接部１６を囲むように該集電箔溶接部１６の同心上に環状（図示した例では楕円環状）に形成されている。   As shown in FIG. 4, the current collector foil laminated portion 84 has the current collector foil welded portion 16 that is integrated with the current collector member 14 by welding (resistance welding here). In this embodiment, in addition to the current collecting member 14, a current collecting auxiliary member (aluminum plate-like member) 17 is welded to the current collecting foil laminated portion 84, and the current collecting member 14, the current collecting foil laminated portion 84 and the current collecting member 14 are collected. A current collector foil welded portion 16 integrated with the electric auxiliary member 17 is formed. A current collector compressed in the stacking direction so that the stacked current collector foils 34 are in close contact with each other at a part of the current collector foil laminated portion 84 and around the current collector foil welded portion 16. A foil compression part 18 is formed. The current collector foil compression part 18 is provided so as to surround the current collector foil welded part 16. In this embodiment, the current collector foil compressing unit 18 compresses (collects) the stacked current collector foils 34 so that the stacked current collector foils 34 are gathered from both sides in the stacking direction to the vicinity of the center of the stacked surface. There is no gap between 34. In this embodiment, as shown in FIG. 3, the current collector foil compression section 18 is annularly formed on the concentricity of the current collector foil welded section 16 so as to surround the current collector foil welded section 16. (Annular).

上記構成によれば、集電箔溶接部１６の周囲を集電箔圧縮部１８（典型的には、積層部分を構成している各集電箔３４が互いに接している集電箔密集部分）で塞いでいるため、溶接時に集電箔を溶接する部位１６（即ち上記集電箔溶接部が形成される部位）から発生し得る溶接スパッタ６０等をその周囲に設けられた集電箔圧縮部１８で囲まれた所定の領域内（図３では楕円環状の集電箔圧縮部１８で囲まれた領域内）に閉じ込めることができる。これにより、溶接スパッタが溶接部周辺に飛散することによる悪影響（例えば溶接スパッタが積層された集電箔の隙間を介して電極体内部に入り込むことによる内部短絡など）を回避することができる。その結果、溶接スパッタの飛散を抑制し得る集電構造を備え、良好な電池性能を有し、且つ、信頼性が高い電池を提供することができる。   According to the above-described configuration, the current collector foil welded portion 16 is surrounded by the current collector foil compressing portion 18 (typically, the current collector foil dense portion where the current collector foils 34 constituting the laminated portion are in contact with each other). The current collector foil compression part provided around the weld spatter 60 and the like that can be generated from the part 16 where the current collector foil is welded during welding (that is, the part where the current collector foil weld part is formed). It can be confined within a predetermined area surrounded by 18 (in FIG. 3, the area surrounded by the elliptical current collector foil compressing section 18). Thereby, the bad influence (for example, the internal short circuit by entering the inside of an electrode body through the clearance gap between the current collector foils in which the welding sputter | spatter was laminated | stacked) by the welding spatter scattered around a welding part can be avoided. As a result, it is possible to provide a battery having a current collecting structure capable of suppressing scattering of welding spatter, having good battery performance, and high reliability.

なお、集電箔圧縮部１８の形状は、集電箔溶接部１６を環囲し得る形状であればよく、図３に示した円環状に限らず、その他の形状（例えば、矩形の環状、その他の多角の環状）であってもよい。また、集電箔圧縮部１８を構成する各集電箔３４は、電池性能に影響を及ぼす虞がある大サイズの溶接スパッタ６０（例えば直径２０μｍ以上の粒状スパッタ）を通過し得ない程度に相互に密接されていればよい。したがって、集電箔圧縮部１８を構成する各集電箔３４の間に、電池性能に影響を及ぼす虞がない極小サイズの溶接スパッタ（例えば直径２０μｍ未満の微粒状スパッタ）が通過するかしないか程度の微小な隙間が局所的に形成されていてもよい。   The shape of the current collector foil compressing portion 18 may be any shape that can surround the current collector foil welded portion 16 and is not limited to the annular shape shown in FIG. 3, but other shapes (for example, a rectangular annular shape, Other polygonal rings) may be used. In addition, the current collector foils 34 constituting the current collector foil compressing section 18 are mutually connected to the extent that they cannot pass through a large-sized welded sputter 60 (for example, a granular sputter having a diameter of 20 μm or more) that may affect battery performance. As long as it is close to. Therefore, whether or not a very small size welding spatter (for example, a fine sputter having a diameter of less than 20 μm) that does not affect the battery performance passes between the current collecting foils 34 constituting the current collecting foil compression unit 18. A minute gap of a degree may be formed locally.

さらに、本実施形態に係る他の特徴について説明する。図４に示すように、この実施形態では、集電箔積層部８４の一部を積層方向に押し付け得る押圧手段１５を備えている。そして、集電箔圧縮部１８は、該押圧手段１５によって上記積層方向に押し付けられた状態で形成されている。この実施形態では、押圧手段１５は、集電箔積層部８４を積層方向の両側から挟み込む一対の突起１５ａ、１５ｂである。そして、集電箔圧縮部１８は、上記突起１５ａ、１５ｂの押圧（挟み込み）により積層された集電箔３４が積層方向の両側から積層面の中央付近に寄せ集められる（集箔される）ようにして形成されている。このように、集電箔圧縮部１８は、一対の突起１５ａ、１５ｂの押圧により積層された集電箔３４を積層方向の両側から積層面の中央付近に寄せ集めるようにして形成されているので、積層された集電箔３４（特に積層方向の最外側に位置する集電箔３４ａ）を大きく屈曲させることなく集箔（圧縮）することができる。その結果、上記集箔（圧縮）作業が容易になるとともに集電箔３４、３４ａの破損（典型的には箔破れ）を確実に回避することができる。   Furthermore, other features according to the present embodiment will be described. As shown in FIG. 4, in this embodiment, the pressing means 15 which can press a part of current collection foil lamination | stacking part 84 to a lamination direction is provided. The current collector foil compression section 18 is formed in a state of being pressed in the stacking direction by the pressing means 15. In this embodiment, the pressing means 15 is a pair of protrusions 15a and 15b that sandwich the current collector foil laminated portion 84 from both sides in the laminating direction. Then, the current collector foil compressing section 18 is configured such that the current collector foils 34 stacked by pressing (sandwiching) the protrusions 15a and 15b are collected (collected) from both sides in the stacking direction to the vicinity of the center of the stacking surface. Is formed. Thus, the current collector foil compression part 18 is formed so that the current collector foils 34 stacked by pressing the pair of protrusions 15a and 15b are gathered from both sides in the stacking direction to the vicinity of the center of the stacking surface. The laminated current collecting foil 34 (particularly, the current collecting foil 34a located on the outermost side in the laminating direction) can be collected (compressed) without greatly bending. As a result, the foil collection (compression) operation is facilitated, and damage to the current collector foils 34 and 34a (typically foil breakage) can be reliably avoided.

また、この実施形態では、押圧手段１５（一対の突起１５ａ、１５ｂ）は、集電部材１４および集電補助部材１７に一体に形成されている。詳しくは、集電部材１４は、集電箔溶接部１６に溶接される溶接突出部１９ａと、押圧手段１５を構成する押圧突起部１５ａとを有している。そして、押圧突起部１５ａは、溶接突出部１９ａおよび集電箔溶接部１６の周辺部分に設けられている。一方、集電補助部材１７は、集電箔溶接部１６に溶接される溶接突出部１９ｂと、押圧手段１５を構成する押圧突起部１５ｂとを有している。そして、押圧突起部１５ｂは、溶接突出部１９ｂおよび集電箔溶接部１６の周辺部分に設けられている。この例では、一対の押圧突起部１５ａ、１５ｂは、それぞれ溶接突出部１９ａ、１９ｂを囲む円環状の突起であり、該溶接突出部１９ａ、１９ｂよりも背高が低くなるように形成されている。このように、押圧手段１５を集電部材１４および集電補助部材１７に一体に形成しているので、別途押圧手段１５（押圧部材）を用意することなく目的の電池を製造することができ、集電構造が複雑になるのを回避できる。   In this embodiment, the pressing means 15 (the pair of protrusions 15 a and 15 b) are integrally formed with the current collecting member 14 and the current collecting auxiliary member 17. Specifically, the current collecting member 14 includes a welding protrusion 19 a welded to the current collector foil welded portion 16 and a pressing protrusion 15 a constituting the pressing means 15. The pressing protrusion 15 a is provided in the peripheral portion of the welding protrusion 19 a and the current collector foil welding portion 16. On the other hand, the current collecting auxiliary member 17 has a welding protrusion 19 b welded to the current collecting foil welded portion 16 and a pressing protrusion 15 b constituting the pressing means 15. The pressing protrusion 15 b is provided in the peripheral portion of the welding protrusion 19 b and the current collector foil weld 16. In this example, the pair of pressing protrusions 15a and 15b are annular protrusions surrounding the welding protrusions 19a and 19b, respectively, and are formed to have a lower height than the welding protrusions 19a and 19b. . Thus, since the pressing means 15 is formed integrally with the current collecting member 14 and the current collecting auxiliary member 17, the target battery can be manufactured without preparing the pressing means 15 (pressing member) separately. It is possible to avoid a complicated current collecting structure.

次に、図５Ａ〜図５Ｃを参照しつつ上記集電部材１４と集電箔積層部８４との溶接工程（即ち集電箔溶接部を形成する工程）について説明する。上述したように、集電部材１４と集電箔積層部８４とは抵抗溶接（ここではスポット溶接）によって接合されている。すなわち、集電部材１４の一部分を集電箔積層部８４の一部分に接触させ、その接触部分を一対の溶接電極（図示せず）で適当に加圧しながら電流を流し、その抵抗熱によってそれらを局所的に溶融・凝固して一体化している。   Next, a welding process (that is, a process of forming a current collector foil welded portion) between the current collecting member 14 and the current collector foil laminated portion 84 will be described with reference to FIGS. 5A to 5C. As described above, the current collecting member 14 and the current collector foil laminated portion 84 are joined by resistance welding (here, spot welding). That is, a part of the current collecting member 14 is brought into contact with a part of the current collector foil laminated portion 84, and an electric current is applied while the contact part is appropriately pressurized with a pair of welding electrodes (not shown), and the resistance heat causes them to flow. It is fused and solidified locally.

詳しくは、図５Ａに示すように、先ず、集電部材１４と集電箔積層部８４とを接触させる。この実施形態では、集電箔積層部８４の一方の面（図では集電箔積層部８４の上面）上に集電部材１４を配置し、溶接突出部１９ａの先端１３ａを集電箔積層部８４の一部分に接触させる。また、集電箔積層部８４の他方の面（図では集電箔積層部８４の下面）上に集電補助部材１７を配置し、溶接突出部１９ｂの先端１３ｂを集電箔積層部８４の一部分に接触させる。このとき、集電部材１４の溶接突出部１９ａと集電補助部材１７の溶接突出部１９ｂとが集電箔積層部８４を間に挟んで対向するように配置される。   Specifically, as shown in FIG. 5A, first, the current collecting member 14 and the current collecting foil laminated portion 84 are brought into contact with each other. In this embodiment, the current collecting member 14 is disposed on one surface of the current collector foil stacking portion 84 (the upper surface of the current collector foil stacking portion 84 in the figure), and the tip 13a of the welding protrusion 19a is connected to the current collector foil stacking portion. 84 is brought into contact with a portion. Further, the current collecting auxiliary member 17 is disposed on the other surface of the current collecting foil laminated portion 84 (the lower surface of the current collecting foil laminated portion 84 in the figure), and the tip 13b of the welding protrusion 19b is connected to the current collecting foil laminated portion 84. Touch a part. At this time, the welding protrusion 19a of the current collecting member 14 and the welding protrusion 19b of the current collecting auxiliary member 17 are disposed so as to face each other with the current collector foil laminated portion 84 interposed therebetween.

次に、図５Ｂに示すように、一対の溶接電極（図示せず）を用いて集電部材１４及び集電補助部材１７を矢印「６２」方向に加圧すると同時に通電する。これにより溶接突出部１９ａ、１９ｂ間に挟まれた各集電箔３４が積層面の中央付近に集箔されるとともに、溶接電極（図示せず）からの電流は、面圧が大きくなる溶接突出部１９ａ、１９ｂ間に集中して流れる。そして、その抵抗発熱によって、溶接突出部１９ａ、１９ｂの先端１３ａ、１３ｂと、該溶接突出部１９ａ、１９ｂ間に集箔された各集電箔３４とが軟化・溶融状態となり、さらに溶接電極からの加圧力で圧接されることにより、溶接突出部１９ａ、１９ｂの先端１３ａ、１３ｂが溶融しつつ押し潰され、集電部材１４と集電箔積層部８４と集電補助部材１７との溶融部分が次第に沈み込む（溶接突出部１９ａ、１９ｂの背高が次第に低くなる）。   Next, as shown in FIG. 5B, the current collecting member 14 and the current collecting auxiliary member 17 are pressurized in the direction of the arrow “62” using a pair of welding electrodes (not shown) and energized at the same time. As a result, each of the current collector foils 34 sandwiched between the weld protrusions 19a and 19b is collected near the center of the laminated surface, and the current from the welding electrode (not shown) causes the surface protrusion to increase. It flows in a concentrated manner between the portions 19a and 19b. The resistance heat generation causes the tips 13a and 13b of the welding protrusions 19a and 19b and the current collecting foils 34 collected between the welding protrusions 19a and 19b to be softened and melted, and further from the welding electrode. Are pressed by the applied pressure of the welding protrusions 19a and 19b, and the melted portions of the current collecting member 14, the current collector foil laminated portion 84, and the current collecting auxiliary member 17 are melted and crushed. Gradually sinks (the height of the welding protrusions 19a and 19b gradually decreases).

さらに加圧・通電を続けると、溶融部分がさらに沈み込み（溶接突出部１９ａ、１９ｂの背高がさらに低くなり）、集電部材１４と集電補助部材１７との距離が縮まり、溶接突出部１９ａ、１９ｂよりも低く形成された押圧突起部１５ａ、１５ｂ（押圧手段１５）が集電箔積層部８４に当接する。そして、図５Ｃに示すように、押圧突起部１５ａ、１５ｂ（押圧手段１５）は、溶接電極からの加圧を受けて、溶融部分（集電箔溶接部１６が形成される部分）の周辺において、集電箔積層部８４の一部分を積層方向に押し付け、該積層された集電箔３４が互いに密接した状態となるように圧縮された集電箔圧縮部１８を形成する。この実施形態では、集電箔圧縮部１８は、積層された集電箔３４を積層方向の両側から積層面の中央付近に寄せ集めるようにして形成されている。また、集電箔圧縮部１８は、溶融部分（集電箔溶接部１６が形成される部分）を囲むように形成され、これによって溶融部分（電箔溶接部１６が形成される部分）から発生した溶接スパッタ（特に通電末期の溶融部分から発生する多数の溶接スパッタ）を該集電箔圧縮部１８で囲まれた領域内に閉じ込める。その後、加圧・通電を停止して溶融部分を凝固することにより、集電箔溶接部１６が形成され、集電箔積層部８４と集電部材１４と集電補助部材１７とが固定される。このようにして、集電箔積層部８４と集電部材１４とを接触させ、該集電箔積層部８４の一部と該集電部材１４の一部とを溶接してなる集電箔溶接部１６を形成することができる。   When the pressurization / energization is further continued, the melted portion further sinks (the height of the welding protrusions 19a and 19b is further reduced), the distance between the current collecting member 14 and the current collecting auxiliary member 17 is reduced, and the welding protrusion Pressing protrusions 15 a and 15 b (pressing means 15) formed lower than 19 a and 19 b abut on the current collector foil laminated portion 84. Then, as shown in FIG. 5C, the pressing protrusions 15a and 15b (pressing means 15) receive pressure from the welding electrode, and around the molten portion (portion where the current collector foil welded portion 16 is formed). Then, a part of the current collector foil stacking portion 84 is pressed in the stacking direction to form the current collector foil compressing portion 18 compressed so that the stacked current collector foils 34 are in close contact with each other. In this embodiment, the current collector foil compressing section 18 is formed such that the stacked current collector foils 34 are gathered from both sides in the stacking direction to the vicinity of the center of the stack surface. The current collector foil compression part 18 is formed so as to surround the melted part (the part where the current collector foil welded part 16 is formed), thereby generating from the melted part (the part where the current foil welded part 16 is formed). The weld spatter (particularly, a large number of weld spatter generated from the melted portion at the end of energization) is confined in the region surrounded by the current collector foil compression section 18. Then, the current collector foil welded portion 16 is formed by stopping the pressurization / energization to solidify the melted portion, and the current collector foil laminated portion 84, the current collector member 14, and the current collector auxiliary member 17 are fixed. . In this way, the current collector foil laminate 84 and the current collector 14 are brought into contact with each other, and a part of the current collector foil laminate 84 and a part of the current collector 14 are welded. The portion 16 can be formed.

上記製造方法によれば、集電箔圧縮部１８で囲まれた領域内に溶接スパッタを閉じ込めることができ、該溶接スパッタの飛散を抑制しつつ集電部材１４を集電箔積層部８４に溶接することができる。これにより、溶接スパッタが溶接部周辺に飛散することによる悪影響（例えば溶接スパッタが積層された集電箔３４の隙間３５を介して電極体内部（特に捲回コア部分８２）に入り込むことによる内部短絡など）を回避することができ、良好な電池性能を有し、且つ、信頼性が高い電池を製造することができる。加えて、押圧手段１５を構成する押圧突起部１５ａを集電部材１４に一体に形成し、且つ、該押圧突起部１５ａが上記溶接を行う際に集電箔積層部８４を積層方向に押し付けるように構成されているので、溶接工程時に集電箔圧縮部１８もまた形成することができ、溶接スパッタの飛散を防止し得る電池１００を効率良く製造することができる。   According to the above manufacturing method, the welding spatter can be confined within the region surrounded by the current collector foil compressing portion 18, and the current collecting member 14 is welded to the current collector foil stacking portion 84 while suppressing scattering of the weld spatter. can do. As a result, an adverse effect caused by welding spatter scattered around the welded portion (for example, internal short circuit caused by entering the inside of the electrode body (particularly, the wound core portion 82) through the gap 35 of the current collector foil 34 on which the welding spatter is laminated). Etc.) can be avoided, and a battery having good battery performance and high reliability can be manufactured. In addition, the pressing protrusion 15a constituting the pressing means 15 is formed integrally with the current collecting member 14, and the current collecting foil stack 84 is pressed in the stacking direction when the pressing protrusion 15a performs the above welding. Therefore, the current collector foil compression part 18 can also be formed during the welding process, and the battery 100 capable of preventing the welding spatter from scattering can be efficiently manufactured.

さらに、この実施形態では、溶接突出部１９ａ、１９ｂを押圧突起部１５ａ、１５ｂよりも高くして集電箔積層部８４と接触させることにより、該溶接突出部１９ａ、１９ｂに集中して通電し、押圧突起部１５ａ、１５ｂへの電流分流（迂回）を防止している。すなわち、通電の途中段階において押圧突起部１５ａ、１５ｂが集電箔積層部８４に触れたとしても、溶接突出部１９ａ、１９ｂの方が面圧は高くなるため、該溶接突出部１９ａ、１９ｂに電流を集中して流すことができ、押圧突起部１５ａ、１５ｂへの電流分流を防止することができる。これにより、押圧突起部１５ａ、１５ｂと集電箔積層部８４との意図しない溶接（延いてはそれを起因とする溶接スパッタの飛散）を防止することができる。なお、溶接スパッタは、一般に通電末期（すなわち溶融の最終段階）に生じることが多く、それゆえ、押圧突起部１５ａ、１５ｂは、溶接が完了する前に（典型的には通電末期の時点において）集電箔圧縮部１８を形成し得るように構成されていればよい。また、押圧突起部１５ａ、１５ｂへの電流分流を防止するために、押圧突起部１５ａ、１５ｂに絶縁処理を施してもよい。すなわち、押圧突起部１５ａ、１５ｂの表面に、例えばエナメルその他の樹脂コーティング等の表面絶縁処理を施すことにより、押圧突起部１５ａ、１５ｂと集電箔積層部８４との意図しない溶接（延いてはそれを起因とする溶接スパッタの飛散）を防止することができる。或いは、集電箔溶接部１６が形成される部分に低温溶融化処理（例えばロウ付け）を行い、該集電箔溶接部１６が形成される部分が低温にて選択的に溶融されるように構成してもよい。   Further, in this embodiment, the welding projections 19a and 19b are made higher than the pressing projections 15a and 15b and brought into contact with the current collector foil laminated portion 84, whereby the welding projections 19a and 19b are concentrated and energized. The current shunting (detour) to the pressing protrusions 15a and 15b is prevented. That is, even if the pressing projections 15a and 15b touch the current collector foil laminated portion 84 in the middle of energization, the welding projections 19a and 19b have higher surface pressure, so the welding projections 19a and 19b A current can be concentrated and current shunting to the pressing protrusions 15a and 15b can be prevented. As a result, unintended welding between the pressing protrusions 15a and 15b and the current collector foil stacking portion 84 (and thus, spattering of welding spatter due to the welding) can be prevented. In general, welding spatter often occurs at the end of energization (that is, the final stage of melting). Therefore, the pressing protrusions 15a and 15b are formed before welding is completed (typically at the end of energization). What is necessary is just to be comprised so that the collector foil compression part 18 can be formed. In addition, in order to prevent current shunting to the pressing protrusions 15a and 15b, the pressing protrusions 15a and 15b may be insulated. That is, the surface of the pressing protrusions 15a and 15b is subjected to surface insulation treatment such as enamel or other resin coating, for example, so that unintentional welding (and extension) of the pressing protrusions 15a and 15b and the current collector foil stacking section 84 is achieved. It is possible to prevent welding spatter scattering). Alternatively, a low temperature melting treatment (for example, brazing) is performed on the portion where the current collector foil welded portion 16 is formed so that the portion where the current collector foil welded portion 16 is formed is selectively melted at a low temperature. It may be configured.

続いて、図６および図７を参照しながら本実施形態に係る電池１００の改変例について説明する。改変例では、図６に示すように、集電箔圧縮部１８は、集電箔溶接部１６に隣接して形成される。この場合、図７に示すように、集電部材１４は、基部となる平板部から半球状に***した部分であって集電箔溶接部１６に溶接される溶接突出部１９ａを有している。さらに詳しくは、溶接突出部１９ａには、集電箔溶接部１６に溶接されている頂部（先端）１３ａと、該頂部１３ａの周縁部であって上記押圧手段１５を構成する湾曲面１５ｃからなる湾曲周縁部１５ａと、が形成されている。また、集電補助部材１７は、集電部材１４と同様の形状であり、基部となる平板部から半球状に***した部分であって集電箔溶接部１６に溶接される溶接突出部１９ｂを有している。さらに詳しくは、溶接突出部１９ｂには、集電箔溶接部１６に溶接されている頂部（先端）１３ｂと、該頂部１３ｂの周縁部であって上記押圧手段１５を構成する湾曲面１５ｃからなる湾曲周縁部１５ｂと、が形成されている。かかる構成によれば、集電箔圧縮部１８と集電箔溶接部１６とが隣接するように形成することができる。すなわち、集電箔溶接部１６周辺の集電箔３４の形状（湾曲形状）に対応して、溶接部位である上記頂部１９ｃの周縁部表面が湾曲面１５ｃとなっていることにより、該湾曲面１５ｃ（押圧手段１５）によって集電箔溶接部１６周辺の集電箔３４を広範囲に押し付けて集電箔３４同士を密接に集約させる（くっつける）ことができる。そのため、集電箔溶接部１６の外縁部分を集電箔圧縮部１８で構成することができる。   Subsequently, a modified example of the battery 100 according to the present embodiment will be described with reference to FIGS. 6 and 7. In the modified example, as shown in FIG. 6, the current collector foil compression portion 18 is formed adjacent to the current collector foil weld portion 16. In this case, as shown in FIG. 7, the current collecting member 14 has a weld protrusion 19 a which is a hemispherical portion from the flat plate portion serving as the base and is welded to the current collector foil welded portion 16. . More specifically, the weld protrusion 19a is composed of a top (tip) 13a welded to the current collector foil weld 16 and a curved surface 15c that constitutes the pressing means 15 at the periphery of the top 13a. A curved peripheral edge portion 15a is formed. Further, the current collecting auxiliary member 17 has the same shape as the current collecting member 14, and is a portion protruding from the flat plate portion serving as a base in a hemispherical shape and having a welding protrusion 19 b welded to the current collecting foil welded portion 16. Have. More specifically, the weld protrusion 19b includes a top portion (tip) 13b welded to the current collector foil welded portion 16, and a curved surface 15c that is a peripheral portion of the top portion 13b and constitutes the pressing means 15. A curved peripheral edge portion 15b is formed. According to this configuration, the current collector foil compression part 18 and the current collector foil welded part 16 can be formed adjacent to each other. That is, the peripheral surface of the top portion 19c, which is a welded portion, corresponds to the shape (curved shape) of the current collector foil 34 around the current collector foil welded portion 16, and thus the curved surface 15c. The current collector foil 34 around the current collector foil welded portion 16 can be pressed over a wide range by 15c (pressing means 15) so that the current collector foils 34 can be closely gathered (attached). Therefore, the outer edge portion of the current collector foil welded portion 16 can be constituted by the current collector foil compressed portion 18.

このように集電箔圧縮部１８を集電箔溶接部１６に隣接して形成することにより、集電箔溶接部１６から生じた溶接スパッタを該溶接部１６にそのまま閉じ込めることができる。そのため、溶接スパッタが溶接部１６近辺に飛散することによる悪影響（例えば溶接品質の低下等）を回避することができ、溶接強度および通電性に優れた電池を提供することができる。また、集電箔圧縮部１８を集電箔溶接部１６に隣接させることにより、集電箔圧縮部１８が占める割合（集電箔圧縮部１８で囲まれた領域の面積）を最小にすることができるので、捲回電極体８０のガス抜き性を確保し易くなる。   By forming the current collector foil compressed portion 18 adjacent to the current collector foil welded portion 16 in this way, weld spatter generated from the current collector foil welded portion 16 can be confined in the welded portion 16 as it is. Therefore, it is possible to avoid an adverse effect (for example, a decrease in welding quality) caused by welding spatter scattered near the welded portion 16, and a battery having excellent welding strength and electrical conductivity can be provided. Further, by making the current collector foil compressed portion 18 adjacent to the current collector foil welded portion 16, the ratio of the current collector foil compressed portion 18 (area of the region surrounded by the current collector foil compressed portion 18) is minimized. Therefore, it is easy to ensure the gas releasing property of the wound electrode body 80.

以下、図１を参照しつつ電池１００を構成する各構成材料について説明する。正極シート３０は、長尺状の正極集電箔３４の上にリチウムイオン電池用正極活物質層が付与されて形成され得る。正極集電箔３４にはアルミニウム箔（本実施形態）その他の正極に適する金属箔が好適に使用される。正極活物質は従来からリチウムイオン電池に用いられる物質の一種または二種以上を特に限定することなく使用することができる。好適例として、ＬｉＭｎ２Ｏ４、ＬｉＣｏＯ２、ＬｉＮｉＯ２等が挙げられる。 Hereinafter, each constituent material which comprises the battery 100 is demonstrated, referring FIG. The positive electrode sheet 30 can be formed by applying a positive electrode active material layer for a lithium ion battery on a long positive electrode current collector foil 34. As the positive electrode current collector foil 34, an aluminum foil (this embodiment) or other metal foil suitable for the positive electrode is preferably used. As the positive electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include LiMn 2 O 4 , LiCoO 2 , LiNiO 2 and the like.

一方、負極シート４０は長尺状の負極集電箔４４の上にリチウムイオン電池用負極活物質層が付与されて形成され得る。負極集電箔４４には銅箔（本実施形態）その他の負極に適する金属箔が好適に使用される。負極活物質は従来からリチウムイオン電池に用いられる物質の一種または二種以上を特に限定することなく使用することができる。好適例として、グラファイトカーボン、アモルファスカーボン等の炭素系材料、リチウム含有遷移金属酸化物や遷移金属窒化物等が挙げられる。   On the other hand, the negative electrode sheet 40 may be formed by applying a negative electrode active material layer for a lithium ion battery on a long negative electrode current collector foil 44. For the negative electrode current collector foil 44, a copper foil (this embodiment) or other metal foil suitable for the negative electrode is preferably used. As the negative electrode active material, one or more of materials conventionally used in lithium ion batteries can be used without any particular limitation. Preferable examples include carbon-based materials such as graphite carbon and amorphous carbon, lithium-containing transition metal oxides and transition metal nitrides.

また、正負極シート間に使用される好適なセパレータシート２２としては多孔質ポリオレフィン系樹脂で構成されたものが挙げられる。電解質として固体電解質若しくはゲル状電解質を使用する場合には、セパレータが不要な場合（即ちこの場合には電解質自体がセパレータとして機能し得る。）があり得る。   Moreover, as a suitable separator sheet 22 used between positive-negative electrode sheets, what was comprised with the porous polyolefin-type resin is mentioned. When a solid electrolyte or a gel electrolyte is used as the electrolyte, a separator may not be necessary (that is, in this case, the electrolyte itself may function as a separator).

電池容器５０内に捲回電極体８０と共に収容される電解液としては、非水溶媒に電解質を溶解した非水電解液が挙げられる。電解液を構成する非水溶媒としては、エチレンカーボネート、プロピレンカーボネート、ジメチルカーボネート（ＤＭＣ）、ジエチルカーボネート、エチルメチルカーボネート（ＥＭＣ）、１，２−ジメトキシエタン、１，２−ジエトキシエタン、テトラヒドロフラン、１，３−ジオキソラン等からなる群から選択された一種または二種以上を用いることができる。電解液を構成する電解質（支持塩）としては、フッ素を構成元素とする各種リチウム塩から選択される一種または二種以上を用いることができる。例えば、ＬｉＰＦ６，ＬｉＢＦ４，ＬｉＡｓＦ６，ＬｉＣＦ３ＳＯ３，ＬｉＣ４Ｆ９ＳＯ３，ＬｉＮ（ＣＦ３ＳＯ２）２，ＬｉＣ（ＣＦ３ＳＯ２）３等からなる群から選択される一種または二種以上を用いることができる。 Examples of the electrolytic solution housed in the battery container 50 together with the wound electrode body 80 include a nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent. Examples of the non-aqueous solvent constituting the electrolytic solution include ethylene carbonate, propylene carbonate, dimethyl carbonate (DMC), diethyl carbonate, ethyl methyl carbonate (EMC), 1,2-dimethoxyethane, 1,2-diethoxyethane, tetrahydrofuran, One or more selected from the group consisting of 1,3-dioxolane and the like can be used. As the electrolyte (supporting salt) constituting the electrolytic solution, one or two or more selected from various lithium salts containing fluorine as a constituent element can be used. For example, LiPF 6, LiBF 4, LiAsF 6, LiCF 3 SO 3, LiC 4 F 9 SO 3, LiN (CF 3 SO 2) 2, LiC (CF 3 SO 2) one selected from the group consisting of 3, etc. or Two or more types can be used.

なお、本実施形態に係る電池１００は特に自動車等の車両に搭載されるモーター（電動機）用電源として好適に使用し得る。即ち、図９に示すように、本発明に係る電池１００を単電池として所定の方向に配列し、当該単電池をその配列方向に拘束することによって組電池を構築し、かかる組電池を電源として備える車両（典型的には自動車、特にハイブリッド自動車、電気自動車、燃料電池自動車のような電動機を備える自動車）１を提供することができる。   The battery 100 according to the present embodiment can be suitably used as a power source for a motor (electric motor) mounted on a vehicle such as an automobile. That is, as shown in FIG. 9, the battery 100 according to the present invention is arranged as a single battery in a predetermined direction, the battery is constructed by constraining the single battery in the arrangement direction, and the battery is used as a power source. It is possible to provide a vehicle 1 (typically, an automobile, in particular, an automobile having an electric motor such as a hybrid vehicle, an electric vehicle, and a fuel cell vehicle) 1.

以上、本発明を好適な実施形態により説明してきたが、こうした記述は限定事項ではなく、勿論、種々の改変が可能である。例えば、本発明の構成に適用可能な電極体は上記捲回タイプに限定されない。   As mentioned above, although this invention was demonstrated by suitable embodiment, such description is not a limitation matter and of course various modifications are possible. For example, the electrode body applicable to the configuration of the present invention is not limited to the above wound type.

例えば正極シートと負極シートをセパレータ（或いはセパレータとしても機能し得る固体またはゲル状電解質）と共に交互に積層して成る積層タイプの電極体であってもよい。   For example, it may be a laminated type electrode body in which a positive electrode sheet and a negative electrode sheet are alternately laminated together with a separator (or a solid or gel electrolyte that can also function as a separator).

また、電池の種類は上述したリチウムイオン電池に限られず、電極体構成材料や電解質が異なる種々の内容の電池、例えばリチウム金属やリチウム合金を負極とするリチウム二次電池、ニッケル水素電池、ニッケルカドミウム電池、或いは電気二重層キャパシタ（即ち物理電池）であってもよい。   In addition, the type of battery is not limited to the above-described lithium ion battery, but batteries having various contents with different electrode body constituent materials and electrolytes, for example, lithium secondary batteries having a negative electrode made of lithium metal or lithium alloy, nickel metal hydride batteries, nickel cadmium It may be a battery or an electric double layer capacitor (that is, a physical battery).

本実施形態に係るリチウムイオン二次電池の外観を模式的に示す正面図。The front view which shows typically the external appearance of the lithium ion secondary battery which concerns on this embodiment. 本実施形態に係る捲回電極体の構成について説明するための図。The figure for demonstrating the structure of the winding electrode body which concerns on this embodiment. 本実施形態に係る集電部材の溶接部周辺を拡大した要部拡大図。The principal part enlarged view which expanded the welding part periphery of the current collection member which concerns on this embodiment. 図３のＩＶ−ＩＶ断面を模式的に示す要部断面図。FIG. 4 is a main part sectional view schematically showing a IV-IV section of FIG. 3. 集電部材の溶接工程について説明する工程断面図。Process sectional drawing explaining the welding process of a current collection member. 集電部材の溶接工程について説明する工程断面図。Process sectional drawing explaining the welding process of a current collection member. 集電部材の溶接工程について説明する工程断面図。Process sectional drawing explaining the welding process of a current collection member. 本実施形態の改変例に係る集電部材の溶接部周辺を拡大した要部拡大図。The principal part enlarged view which expanded the welding part periphery of the current collection member which concerns on the modification of this embodiment. 図６のＶＩＩ−ＶＩＩ断面を模式的に示す要部断面図。FIG. 7 is a main part sectional view schematically showing a VII-VII section in FIG. 6. 従来の捲回電極体の構成について説明するための図。The figure for demonstrating the structure of the conventional winding electrode body. 本発明の電池を備えた車両（自動車）を模式的に示す側面図。The side view which shows typically the vehicle (automobile) provided with the battery of this invention.

符号の説明Explanation of symbols

１ 車両
１１ 負極集電部材
１３ 先端（頂部）
１４ 正極集電部材
１５ 押圧手段
１５ａ、１５ｂ 押圧突起部
１５ｃ 湾曲面
１６ 集電箔溶接部
１７ 集電補助部材
１８ 集電箔圧縮部
１９ａ、１９ｂ 溶接突出部
２０ シート状電極体
２２ セパレータシート
３０ 正極シート
３２ 正極活物質層
３４ 正極集電箔
３４ａ 最外側集電箔
３５ 隙間
３６ 正極活物質層非形成部
４０ 負極シート
４２ 負極活物質層
４４ 負極集電箔
４６ 負極活物質層非形成部
５０ 容器
５２ 蓋体
５４ａ ガスケット
５６ａ 正極端子
５６ｂ 負極端子
６０ 溶接スパッタ
８０ 捲回電極体
８０ 電極体
８２ 捲回コア部分
８４ 正極集電箔積層部
８６ 負極集電箔積層部
９０ 捲回電極体
９２ 集電箔積層部
９４ａ 集電部材
１００ 電池 1 Vehicle 11 Negative Current Collector 13 Tip (Top)
14 Positive electrode current collecting member 15 Pressing means 15a, 15b Pressing protrusion 15c Curved surface 16 Current collecting foil welded portion 17 Current collecting auxiliary member 18 Current collecting foil compressing portion 19a, 19b Welding protrusion 20 Sheet-like electrode body 22 Separator sheet 30 Positive electrode Sheet 32 Positive electrode active material layer 34 Positive electrode current collector foil 34a Outermost current collector foil 35 Gap 36 Positive electrode active material layer non-formed part 40 Negative electrode sheet 42 Negative electrode active material layer 44 Negative electrode current collector foil 46 Negative electrode active material layer non-formed part 50 Container 52 Lid 54a Gasket 56a Positive electrode terminal 56b Negative electrode terminal 60 Welding sputter 80 Winding electrode body 80 Electrode body 82 Winding core part 84 Positive electrode current collector foil laminate part 86 Negative electrode current collector foil laminate part 90 Winding electrode body 92 Current collector foil Laminated portion 94a Current collecting member 100 Battery

Claims (12)

箔状の集電体が積層した構成の集電箔積層部を有する電極体と、
前記集電箔積層部上に配置され、該集電箔積層部に溶接された集電部材と
を備え、
前記集電箔積層部は、前記集電部材に溶接されて該集電部材と一体となった集電箔溶接部を有しており、
前記集電箔積層部の一部分であって前記集電箔溶接部の周辺部分には、前記積層された集電箔が互いに密接した状態となるように積層方向に圧縮された集電箔圧縮部が前記集電箔溶接部の周りを囲むように形成されている、電池。 An electrode body having a current collector foil laminated portion having a structure in which foil-shaped current collectors are laminated;
A current collecting member disposed on the current collector foil laminate and welded to the current collector foil laminate;
The current collector foil laminated portion has a current collector foil welded portion that is welded to the current collector and integrated with the current collector.
A current collector foil compression part that is a part of the current collector foil laminated part and is compressed in the lamination direction so that the laminated current collector foils are in close contact with each other at the peripheral part of the current collector foil welded part Is formed so as to surround the current collector foil welded portion. 前記集電箔積層部の一部を積層方向に押し付け得る押圧手段を備えており、
前記集電箔圧縮部は、前記押圧手段によって前記積層方向に押し付けられた状態で形成されている、請求項１に記載の電池。 Comprising a pressing means capable of pressing a part of the current collector foil stacking portion in the stacking direction;
The battery according to claim 1, wherein the current collector foil compression section is formed in a state of being pressed in the stacking direction by the pressing means. 前記押圧手段は、前記集電箔積層部を積層方向の両側から挟み込む一対の突起であり、
前記集電箔圧縮部は、前記突起の押圧により前記積層された集電箔が積層方向の両側から積層面の中央付近に寄せ集められるようにして形成されている、請求項２に記載の電池。 The pressing means is a pair of protrusions that sandwich the current collector foil laminate from both sides in the lamination direction,
3. The battery according to claim 2, wherein the current collector foil compression section is formed such that the stacked current collector foils are gathered together near the center of the stack surface from both sides in the stack direction by pressing of the protrusions. . 前記押圧手段は、前記集電部材に一体に形成されている、請求項２または３に記載の電池。   The battery according to claim 2 or 3, wherein the pressing means is formed integrally with the current collecting member. 前記集電部材は、前記押圧手段を構成する押圧突起部であって、前記集電箔溶接部の周辺部分に設けられた押圧突起部と、
前記集電箔溶接部に溶接される溶接突出部であって前記押圧突起部よりも外方に突出した溶接突出部と
を有する、請求項４に記載の電池。 The current collecting member is a pressing projection that constitutes the pressing means, and a pressing projection provided in a peripheral portion of the current collector foil welded portion;
The battery according to claim 4, further comprising: a welding protrusion that is welded to the current collector foil weld and protrudes outward from the pressing protrusion. 前記集電部材は、前記集電箔溶接部に溶接される溶接突出部を有しており、
前記溶接突出部には、前記集電箔溶接部に溶接されている頂部と、該頂部の周縁部であって前記押圧手段を構成する湾曲面からなる湾曲周縁部とが形成されている、請求項４に記載の電池。 The current collecting member has a welding protrusion welded to the current collector foil welded portion,
The weld protrusion is formed with a top welded to the current collector foil weld, and a curved peripheral edge composed of a curved surface that is a peripheral edge of the top and constitutes the pressing means. Item 5. The battery according to Item 4. 請求項１から６のいずれか一つに記載の電池を備える車両。   A vehicle comprising the battery according to any one of claims 1 to 6. 箔状の集電体が積層した構成の集電箔積層部を有する電極体と、該集電箔積層部上に配置され、該集電箔積層部に溶接された集電部材と、を備えた電池の製造方法であって：
前記集電箔積層部と前記集電部材とを接触させ、該集電箔積層部の一部と該集電部材の一部とを溶接してなる集電箔溶接部を形成する工程；および
前記溶接が完了する前に前記集電箔溶接部が形成される部分の周辺において、前記集電箔積層部の一部分を積層方向に押し付けて、前記積層された集電箔が互いに密接した状態となるように圧縮された集電箔圧縮部を形成する工程；
を包含し、
ここで、前記集電箔圧縮部は、前記集電箔溶接部が形成される部分を囲むように形成され且つ前記溶接時において溶融させた前記接触部分から発生し得る溶接スパッタを該集電箔圧縮部で囲まれた領域内に閉じ込めるように形成される、製造方法。 An electrode body having a current collector foil laminated portion having a configuration in which a foil-shaped current collector is laminated, and a current collector member disposed on the current collector foil laminated portion and welded to the current collector foil laminated portion. A battery manufacturing method comprising:
Forming the current collector foil welded portion by bringing the current collector foil stacked portion into contact with the current collector and welding a part of the current collector foil stacked portion and a part of the current collector; and Before the welding is completed, around the portion where the current collector foil welded portion is formed, a part of the current collector foil laminated portion is pressed in the stacking direction, and the stacked current collector foils are in close contact with each other Forming a current collector foil compressed part so compressed;
Including
Here, the current collector foil compression part is formed so as to surround the part where the current collector foil welded part is formed, and the current collector foil generates weld spatter that can be generated from the contact part melted during the welding. The manufacturing method formed so that it may be confined in the area | region enclosed by the compression part. 前記集電箔圧縮部は、前記積層された集電箔を積層方向の両側から積層面の中央付近に寄せ集めるようにして形成される、請求項８に記載の製造方法。   The said collector foil compression part is a manufacturing method of Claim 8 formed so that the laminated | stacked collector foil may be gathered near the center of a lamination surface from the both sides of a lamination direction. 前記集電部材として、前記集電箔積層部の一部分を積層方向に押し付ける押圧手段を備える集電部材を使用する、請求項８または９に記載の製造方法。   The manufacturing method of Claim 8 or 9 which uses a current collection member provided with the press means which presses a part of said current collection foil lamination | stacking part to a lamination direction as the said current collection member. 前記押圧手段は前記集電部材に一体に形成された押圧突起部であり、該押圧突起部は、前記溶接を行う際に前記集電箔積層部を積層方向に押し付けるように構成されている、請求項１０に記載の製造方法。   The pressing means is a pressing protrusion formed integrally with the current collecting member, and the pressing protrusion is configured to press the current collecting foil stack in the stacking direction when performing the welding. The manufacturing method according to claim 10. 前記集電部材は、前記集電箔溶接部に溶接される溶接突出部であって前記押圧突起部よりも外方に突出した溶接突出部を有しており、
前記溶接を行う際に、前記溶接突出部と前記集電箔積層部とが接触するように配置する、請求項１１に記載の製造方法。 The current collector member is a weld protrusion that is welded to the current collector foil weld, and has a weld protrusion that protrudes outward from the pressing protrusion,
The manufacturing method of Claim 11 arrange | positioned so that the said welding protrusion part and the said collector foil laminated part may contact when performing the said welding.
JP2008109212A 2008-04-18 2008-04-18 Battery and its manufacturing method Withdrawn JP2009259697A (en)

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JP2010086688A (en) * 2008-09-30 2010-04-15 Sanyo Electric Co Ltd Sealed battery
JP2011165436A (en) * 2010-02-08 2011-08-25 Hitachi Vehicle Energy Ltd Lithium ion secondary battery
US9159505B2 (en) 2011-08-31 2015-10-13 Gs Yuasa International Ltd. Electric storage device
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JPWO2018159198A1 (en) * 2017-02-28 2019-06-27 日立オートモティブシステムズ株式会社 Secondary battery
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