JP2005190913A - Lithium secondary battery - Google Patents

Lithium secondary battery Download PDF

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JP2005190913A
JP2005190913A JP2003433235A JP2003433235A JP2005190913A JP 2005190913 A JP2005190913 A JP 2005190913A JP 2003433235 A JP2003433235 A JP 2003433235A JP 2003433235 A JP2003433235 A JP 2003433235A JP 2005190913 A JP2005190913 A JP 2005190913A
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electrode plate
active material
portion
negative electrode
separator
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JP4451654B2 (en )
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Tatsuya Hashimoto
達也 橋本
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Matsushita Electric Ind Co Ltd
松下電器産業株式会社
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation
    • Y02E60/122Lithium-ion batteries

Abstract

PROBLEM TO BE SOLVED: To provide a lithium secondary battery wherein the battery size can be made small or battery capacity can be made large in the same battery size.
SOLUTION: In this lithium secondary battery, a group of electrode plates 3 wherein a positive electrode plate 4 and a negative electrode plate 5 wherein plain parts 42, 52 not coated with the active material are formed at one end parts in a width direction are wound while active material coating parts 41, 51 are disposed facing each other through a separator 6 and the plain parts 42, 52 of the positive and negative electrode plates 4, 5 are projected in a counter direction, the width of the active material coating part 51 of the negative electrode plate 5 is larger than the width of the active material coating part 41 of the positive electrode plate 4, and winding is performed in a state that the boundary of the active material coating part 51 and the plain part 52 in the negative electrode plate 5 and a side edge of the separator 6 are almost adjusted to form the group of electrode 3.
COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明はリチウム二次電池に関し、特に正極板と負極板をセパレータを介して巻回して成る極板群を備えているリチウム二次電池に関するものである。 The present invention relates to a lithium secondary battery and a respect lithium secondary battery, electrode group formed by winding, especially through the separator a positive electrode plate and the negative electrode plate.

リチウムイオン二次電池などの二次電池として、正極板と負極板をセパレータを介して巻回して成る極板群を有し、かつその極板群においては、正極板及び負極板の幅方向一端部に活物質を塗着していない無地部を形成するとともにこれら正極板と負極板の無地部を互いに反対方向に突出させ、各々の無地部の端縁に集電板を接合したものが知られている(例えば、特許文献1参照。)。 As a secondary battery such as a lithium ion secondary battery has a electrode plate group composed by winding via a separator positive electrode plate and the negative electrode plate, and in that electrode plate assembly, the width direction end of the positive electrode plate and negative electrode plate parts projecting in opposite directions the uncoated portion of the positive electrode plate and the negative electrode plate to form a non-coating portion that is not an active material was coated on, those joining the current collector plate to the edge of each of the uncoated region is known are (e.g., see Patent Document 1.).

このような極板群においては、図5に示すように、正極板4の活物質を塗着した活物質塗着部41と負極板5の活物質を塗着した活物質塗着部51をセパレータ6を介して互いに対向させ、両活物質間でリチウムイオンの吸蔵または放出を行わせることで充放電作用を得るように構成されている。 In such electrode plate group, as shown in FIG. 5, the active material application portion 51 Nurigi the active material of the active material application portion 41 and the negative electrode plate 5 that Nurigi the active material of the positive electrode plate 4 through the separator 6 are opposed to each other, and is configured to obtain the charge-discharge action by causing the occlusion or release of lithium ions between Ryokatsu material. さらに、正極板4の活物質塗着部41の幅寸法pに比して負極板5の活物質塗着部51の幅寸法nの方を大きく設定し、負極板5の活物質塗着部51の両側縁部を正極板4の活物質塗着部41の両側縁よりも外側にそれぞれ寸法e、fだけ突出させることによって、負極板5の活物質塗着部51における金属リチウムの析出が防止されている。 Moreover, the large set towards the width dimension n of the active material application portion 51 of the negative electrode plate 5 relative to the width p of the active material application portion 41 of the positive electrode plate 4, the active material-application portion of the negative electrode plate 5 51 respectively dimension e of the side edge portions outward beyond the side edges of the active material application portion 41 of the positive electrode plate 4, by projecting only f, precipitation of metallic lithium in the active material application portion 51 of the negative electrode plate 5 It is prevented. 即ち、負極板5の活物質塗着部51に、正極板4の活物質から放出されたリチウムイオンを完全に吸蔵できない部位が発生すると、その部位に金属リチウムが針状に析出し、この金属リチウムがセパレータ6を突き破って短絡を発生する恐れがあるため、その防止が図られている。 That is, the active material application portion 51 of the negative electrode plate 5, the portion that can not be completely occluded the released lithium ions from the active material of the positive electrode plate 4 occurs, the metal lithium is precipitated in the acicular to the site, this metal because it may lithium generates a short circuit breaks through the separator 6, the prevention is achieved.

また、正負極板4、5間の絶縁を確実に図るために、セパレータ6の幅寸法を、幅の広い負極板5の活物質塗着部51の幅寸法よりも大きく設定し、セパレータ6の両側縁部が負極板5の活物質塗着部51の両側縁よりも外側にそれぞれ寸法b、cだけ突出するように構成されている。 Further, in order to ensure the insulation between the positive and negative plates 4 and 5, the width of the separator 6, is set larger than the width of the active material application portion 51 of the wide negative electrode plate 5 having a width, the separator 6 each dimension b outwardly from both side edges of the active material application portion 51 of the both side edges negative electrode plate 5, is configured to protrude by c. そして、正極板4及び負極板5の無地部42、52は、集電体7、8との確実な接合作業を確保するのに必要な寸法a、dだけセパレータ6の両側縁よりも外側に突出するようにその幅寸法が設定されている。 The uncoated regions 42 and 52 of the positive electrode plate 4 and the negative electrode plate 5, the size needed to ensure a reliable joining operation with the current collector 7, 8 a, outside the side edges of the d just separator 6 the width dimension so as to protrude is set.

従って、上記のように正極板4の無地部42のセパレータ6の側縁からの突出寸法をa、負極板5の無地部52とは反対側の側縁からのセパレータ6の突出寸法をb、負極板5の活物質塗着部51と無地部52の境界からのセパレータ6の突出寸法をc、負極板5の無地部52のセパレータ6の側縁からの突出寸法をd、正極板4の活物質塗着部41の幅寸法をp、負極板5の活物質塗着部51の幅寸法をn、正極板4の活物質塗着部41の両側縁からの負極板5の活物質塗着部51の突出寸法をそれぞれe、fとして、正極板4の無地部42の側縁から負極板5の無地部52の側縁までの極板群3の幅寸法Dは、負極板5の活物質塗着部51の幅寸法nを基準にすると、D=n+(a+b+c+d)で与えられる。 Accordingly, a projecting dimension from the side edge of the separator 6 of the uncoated portion 42 of the positive electrode plate 4 as described above, the protrusion dimension of the separator 6 from the side edge opposite to the uncoated portion 52 of the negative electrode plate 5 b, the projecting dimension of the separator 6 from the boundary of the active material application portion 51 and the uncoated portion 52 of the negative electrode plate 5 c, d the projection dimension from the side edge of the separator 6 of the uncoated portion 52 of the negative electrode plate 5, the positive electrode plate 4 the width of the active material application portion 41 p, the width of the active material application portion 51 n of the negative electrode plate 5, the active material coating the negative electrode plate 5 from the opposite side edges of the active material application portion 41 of the positive electrode plate 4 e the projecting dimension of the application section 51, respectively, as f, the width dimension D of the electrode plate assembly 3 from the side edge to the side edge of the uncoated portion 52 of the negative electrode plate 5 of the non-coating portion 42 of the positive electrode plate 4, the negative electrode plate 5 When referenced to the width dimension n of the active material application portion 51, is given by D = n + (a + b + c + d).
特開2001−185120号公報 JP 2001-185120 JP

ところで、セパレータ6の両側縁部では、負極板5の活物質塗着部51における無地部52とは反対側の側縁と正極板4との短絡を防止し、また正極板4の活物質塗着部41における無地部42とは反対側の側縁と負極板5との短絡を防止する作用を持つことが求められている。 Incidentally, in the both side edge portions of the separators 6, and prevent a short circuit between the side edges and the positive electrode plate 4 opposite the uncoated region 52 in the active material application portion 51 of the negative electrode plate 5 and the active material coating the positive electrode plate 4 It has the function of preventing a short circuit between the side edge and the negative electrode plate 5 opposite is demanded from the uncoated portion 42 of the wear part 41. そして、負極板5の活物質塗着部51における無地部52とは反対側の側縁と正極板4との間では、負極板5の活物質塗着部51から寸法bだけセパレータ6を突出させることで短絡が防止されているが、正極板4の活物質塗着部41における無地部42とは反対側の側縁と負極板5との間では、負極板5の活物質塗着部51から寸法(f+c)だけセパレータ6を突出させることで短絡が防止されている。 Then, between the side edges and the positive electrode plate 4 opposite the uncoated region 52 in the active material application portion 51 of the negative electrode plate 5, protruding dimension b only separator 6 from the active material application portion 51 of the negative electrode plate 5 Although short by causing is prevented and, between the side edge and the negative electrode plate 5 opposite the uncoated region 42 in the active material application portion 41 of the positive electrode plate 4, the active material-application portion of the negative electrode plate 5 short circuit be protruded only separator 6 dimensions (f + c) is prevented from 51.

しかるに、正極板4の活物質塗着部41における無地部42とは反対側の側縁と負極板5との間の短絡防止ためのセパレータの突出寸法としては、寸法c、若しくは寸法fがcよりも大きい場合には寸法fだけあれば十分であり、かつ通常は寸法cとfはほぼ同等の大きさに設定されており、そのためセパレータ6を負極板5の活物質塗着部51から寸法(f+c)だけ突出させた状態では突出寸法が過剰となっている。 However, as the protruding dimension of the separator for preventing short circuit between the opposite side edge and the negative electrode plate 5 of the uncoated region 42 in the active material application portion 41 of the positive electrode plate 4, the dimension c, or dimension f is c If more greater is sufficient by a dimension f, and the dimension normally is set to a size of approximately the dimensions c and f equal, a separator 6 for the active material application portion 51 of the negative electrode plate 5 (f + c) projecting dimension is in a state in which only protrude is excessive. その結果、極板群の幅寸法Dが余計に大きくなっており、その分電池サイズが大きくなり、逆に同一電池サイズとすると電池容量が相対的に小さくなるという問題がある。 As a result, the width D of the electrode plate group has become extra large, correspondingly battery size is increased, the battery capacity when the same cell size in the opposite there is a problem that relatively small.

本発明は、上記従来の問題点に鑑み、電池サイズを小さくでき若しくは同一電池サイズでは電池容量を大きくできるリチウム二次電池を提供することを課題とする。 The present invention is the light of the conventional problems, the less able or identical cell size battery size and to provide a lithium secondary battery can be increased battery capacity.

本発明のリチウム二次電池は、幅方向の一端部に活物質を塗着していない無地部を形成した正極板と負極板とを、それぞれの活物質塗着部をセパレータを介して対向させ、かつ前記正負両極板のそれぞれの無地部を互いに反対方向に突出させた状態で巻回して成る極板群を備えたリチウム二次電池において、前記負極板の活物質塗着部の幅は前記正極板の活物質塗着部の幅より大きく設定し、前記負極板における活物質塗着部と無地部との境界とセパレータの側縁とをほぼ合致させた状態で巻回して極板群を構成したものである。 The lithium secondary battery of the present invention, the positive electrode plate and the negative electrode plate to form a non-coating portion that is not Nurigi the active material on one end portion in the width direction, are opposed to each other via the separator respectively active material application portion and a lithium secondary battery including the electrode plate group formed by turning each winding the uncoated portions in a state of protruding in opposite directions of the positive and negative electrodes plate, the width of the active material-application portion of the negative electrode plate is the set large than the width of the active material-application portion of the positive electrode plate, the negative active material-application portion of the electrode plate and the winding turn by the electrode plate group in a state of substantially align your and side edges of the boundary and the separator between the uncoated region it is those that you configured.

この構成によると、負極板における活物質塗着部と無地部との境界とセパレータの側縁とをほぼ合致させた状態で巻回して極板群を構成しているが、負極板の活物質塗着部の幅が正極板の活物質塗着部の幅より大きく、負極板の活物質塗着部の両側部は正極板の活物質塗着部の側縁よりも所定の幅寸法突出しているため、その側縁までセパレータの側縁を延出させていることで、このセパレータにて正極板の活物質塗着部の側縁と負極板との間の短絡を防止することができる。 According to this configuration, it constitutes a plate group wound in a state in which substantially align your and side edges of the boundary and the separator between the active material-application portion and the uncoated portion of the negative electrode plate, the active material of the negative electrode plate the width of the coating portion is larger than the width of the active material-application portion of the positive electrode plate, both side portions of the active material-application portion of the negative electrode plate with a predetermined width protrudes from the side edge of the active material-application portion of the positive electrode plate are therefore, that is by extending the side edges of the separator to its side edges, it is possible to prevent short circuit between the side edges of the active material-application portion of the positive electrode plate by the separator and the negative electrode plate. しかも、セパレータが負極板における活物質塗着部と無地部との境界から突出しないので、従来、負極板の活物質塗着部と無地部との境界から突出していたセパレータの突出寸法を節減でき、かつセパレータから突出させる無地部の突出寸法は変わらないので、セパレータの突出寸法の低減分だけ極板群の幅寸法を小さくでき、またそれに伴って電池サイズを小さくすることができ、若しくは同一電池サイズでは活物質塗着部の寸法を大きくできて電池容量を大きくすることができる。 Moreover, since the separator does not protrude from the boundary between the active material-application portion and the uncoated portion of the negative electrode plate, conventionally, you can save protrusion dimension of separator protrude from the boundary between the active material-application portion and the uncoated portion of the negative electrode plate and since the projecting dimension of the uncoated portion to protrude from the separator remains unchanged, only the amount of decrease in the projecting dimension of the separator can reduce the width dimension of the electrode plate group, also it is possible to reduce the battery size accordingly, or the same cell the size can be increased battery capacity can increase the size of the active material application portion.

本発明のリチウム二次電池によれば、セパレータの側縁を負極板における活物質塗着部と無地部との境界にほぼ合致させ、この境界から突出していたセパレータの突出寸法を節減したことで、その分電池サイズを小さくでき若しくは同一電池サイズでは活物質塗着部の寸法を大きくできて電池容量を大きくすることができる。 According to the lithium secondary battery of the present invention, the side edges of the separator substantially to conform to the boundary between the active material-application portion and the uncoated portion of the negative electrode plate, that has reduced the projecting dimension of the separator not protrude from the boundary in its partial cell size can be made smaller or the same cell size can be increased battery capacity can increase the size of the active material application portion.

以下、本発明の角形電池の一実施形態について、図1〜図4を参照して説明する。 Hereinafter, an embodiment of a prismatic battery of the present invention will be described with reference to FIGS.

図1、図2において、1はリチウム二次電池から成る角形電池で、横断面形状が扁平な長方形、若しくは隅丸長方形ないし長円形の角筒状のケース2内に、発電要素としての極板群3が電解液とともに収容されている。 1 and 2, 1 is a rectangular battery comprising a lithium secondary battery, cross-sectional shape is flat rectangular, or the Sumimaru rectangular or oval rectangular tube-shaped casing 2, plate as a generator element group 3 is housed together with an electrolyte.

図3に示すように、極板群3は、帯状の正極板4とセパレータ6と負極板5とセパレータ6を順次重ねた状態で薄板状の巻芯材の外周に巻回し、巻回終了後に巻芯材を引き抜いて扁平に圧縮することで構成されており、正極板4と負極板5がそれらの間にセパレータ6を介装した状態で積層された構成となっている。 As shown in FIG. 3, the electrode plate group 3 is wound on the outer periphery of the thin plate-like winding core in a state of sequentially overlapping a strip positive electrode plate 4 and the separator 6 and the negative electrode plate 5 and the separator 6, after completion of the winding pull the winding core is constructed by compressing a flat, it has a structure in which positive electrode plate 4 and the negative electrode plate 5 are laminated while interposing a separator 6 between them. 正極板4はアルミ箔から成る芯材4aに正極合剤を塗着・乾燥して構成された活物質塗着部41を有し、負極板5は銅箔から成る芯材5aに負極合剤を塗着・乾燥して構成された活物質塗着部51を有し、セパレータ6は多孔性ポリプロピレンフィルムなどにて構成されている。 The positive electrode plate 4 has an active material application portion 41 that a positive electrode mixture on the core material 4a is configured by the coating and drying made of aluminum foil, the negative electrode plate 5 is the negative electrode mixture on the core material 5a made of copper foil the has an active material application portion 51 which is configured by the coating and drying, the separator 6 is constituted by such as a porous polypropylene film. また、この極板群3の外周は短絡防止の必要に応じて外周セパレータ(図示せず)にて覆われ、若しくはケース2の内周に絶縁樹脂層(図示せず)が形成されている。 Further, the outer periphery of the electrode plate group 3 is covered with the outer peripheral separator (not shown) as necessary to prevent short-circuit, or the inner circumference to the insulating resin layer of the case 2 (not shown) is formed.

極板群3において、正極板4のアルミ箔から成る芯材4aと負極板5の銅箔から成る芯材5aは互いに反対側に突出されてそれぞれ無地部42、52が形成されており、突出した正極の無地部42に正極集電体7がレーザビーム溶接や電子ビーム溶接にて接合され、突出した負極の無地部52に負極集電体8がレーザビーム溶接や電子ビーム溶接にて接合されている。 In the electrode plate group 3, the core member 5a made of a copper foil of the core 4a and the negative electrode plate 5 made of aluminum foil of the positive electrode plate 4 is non-coating portions 42, 52 respectively formed to protrude on opposite sides from each other, projecting is the bonded positive electrode collector 7 to the uncoated portion 42 of the positive electrode by laser beam welding or electron beam welding, the negative electrode current collector 8 are joined by laser beam welding or electron beam welding to the uncoated portion 52 of the negative electrode projecting ing.

正極集電体7は、図1に示すように、ケース2の下端開口を閉鎖する下部蓋体を兼用しており、図2に示すように、平面形状がケース2の下端部内周に嵌合する長円形で、その外周縁の全周に環状立ち上げ部9が外側(極板群3とは反対側)に向けて立ち上げ形成されている。 Cathode current collector 7, as shown in FIG. 1, are shared with the lower lid for closing the lower end opening of the case 2, as shown in FIG. 2, the fitting planar shape into the inner periphery of the lower end portion of the case 2 oblong to, annular raised portion 9 is raised toward the formation (the side opposite to the electrode plate group 3) outside the entire circumference of the outer peripheral edge thereof. この正極集電体7をケース2の下端部に嵌合させ、ケース2の下端縁と環状立ち上げ部9の端縁をレーザビーム溶接などで溶接し、その溶接部10にて密封状態で一体接合されている。 The positive electrode current collector 7 is fitted to the lower end of the case 2, and welding the edges of the lower edge and the annular raised portion 9 of the casing 2 in such a laser beam welding, integrally sealingly at its weld portion 10 They are joined. また、その長辺方向の両端の半円部では周方向の略中央部に、内側(極板群3側)に向けて突出する半径方向の接合突部11が突出形成され、両端部間では長辺方向に適当間隔置きに複数のほぼ全幅にわたる接合突部12が突出形成され、これら接合突部11、12を極板群3から突出している正極板4の無地部42に圧接させた状態で、これらの接合突部11、12の部分でレーザビーム溶接や電子ビーム溶接を行って正極板4の無地部42と接合されている。 Further, a substantially central portion of the circumferential direction in the semicircular portion of both ends of the longitudinal direction, the radial direction of the joint projection 11 projecting toward the inner side (the electrode plate group 3 side) is protruded, in between the ends state joining projection 12 over a plurality of substantially the entire width is formed to project long side direction every suitable intervals these joining protrusions 11 and 12 is pressed against the plain portion 42 of the positive electrode plate 4 protruding from the electrode plate group 3 in, it is joined to the uncoated portion 42 of the positive electrode plate 4 performs laser beam welding or electron beam welding in of these joining protrusions 11 and 12.

負極集電体8は、図1に示すように、ケース2の上端開口を閉鎖する上部蓋体13と極板群3の上端との間の空間に配設されており、図2に示すように、平面形状がケース2内に収容配置される平面形状がほぼ長円形の平板にて構成され、その長辺方向の両端の半円部では周方向の略中央部に、内側(極板群3側)に向けて突出する半径方向の接合突部14が突出形成され、両端部間では長辺方向に適当間隔置きに複数のほぼ全幅にわたる接合突部15が突出形成され、これら接合突部14、15を極板群3から突出している負極板5の無地部52に圧接させた状態で、これらの接合突部14、15の部分でレーザビーム溶接や電子ビーム溶接を行って負極板5の無地部52に接合されている。 Negative electrode current collector 8, as shown in FIG. 1, it is disposed in the space between the upper end of the upper lid 13 and the electrode plate group 3 for closing the top opening of the case 2, as shown in FIG. 2 , the planar shape is configured by planar shape generally oblong flat plate housed disposed in the case 2, the semi-circular portions at both ends of its longitudinal direction at a substantially central portion in the circumferential direction, inner (electrode plate group radial junction protrusion 14 projecting toward the 3 side) is protruded, joining projection 15 over a plurality of substantially the entire width is formed to project every suitable intervals in the long side direction between both end portions, these joining protrusions 14 and 15 in a state of being pressed against the solid portion 52 of the negative electrode plate 5 projecting from the electrode plate group 3, laser beam welding or electron beam welding carried out negative electrode plate 5 at the portion of these bonding projections 14, 15 It is joined to the uncoated portion 52 of the.

また、負極集電体8には、その長辺方向の一端近傍部に、上面が平坦な略Ω字状ないしパンタグラフ形状の緩衝部16が一体的に屈曲成形されている。 Further, the negative electrode current collector 8, near one end portion of the long side direction, the buffer section 16 of the top surface flat substantially Ω-shaped or pantograph shape are bent integrally molded. なお、この緩衝部16は別途に成形したものを平板状の負極集電体8に一体接合しても良い。 It is also possible to integrally joined on a flat negative electrode current collector 8 as the buffer portion 16 is molded separately. また、この緩衝部16の上面中央部にはバーリング加工による筒状突部17が形成され、この筒状突部17に負極端子としての電極柱18の下端面に形成した嵌合穴19が嵌合され、電極柱18が精度良く位置決めされた状態で抵抗溶接等にて緩衝部16に一体接合されている。 Further, the tubular projection 17 by burring the central portion of the upper surface of the cushioning portion 16 is formed, a fitting hole 19 formed on the lower end face of the electrode posts 18 as a negative electrode terminal to the tubular projection 17 is fitted the combined, it is integrally joined to the cushioning portion 16 in a state where the electrode post 18 is accurately positioned by resistance welding or the like. かくして、電極柱18は緩衝部16を介して水平方向及び垂直方向の変位及び水平方向の揺動を許容する状態で負極集電体8に接続されている。 Thus, the electrode posts 18 is connected to the anode current collector 8 in a state that allows the swinging of the horizontal and vertical displacement and horizontal direction via the cushioning portion 16.

電極柱18の上部には、接続用平面20aを形成するDカット部20が形成され、その下方に適当距離の位置に断面円弧状の浅い密封用の環状凹部21が形成されている。 The top of the electrode column 18, D-cut portion 20 which forms a connection plane 20a is formed an annular recess 21 is formed for shallow seal of arcuate cross section in a position suitable distance thereunder. この環状凹部21は、場合によっては形成しなくても良く、あるいは非常に浅い多条の環状溝を所定範囲にわたって形成しても良い。 The annular recess 21 is optionally may be formed over is good, or a predetermined range of very shallow multi Article annular groove without formation.

上部蓋体13は、平面形状がケース2の上端部内周に嵌合する長円形で、その外周縁の全周に環状立ち上げ部22が外側(極板群3とは反対側)に向けて立ち上げ形成されており、この上部蓋体13がケース2の上端部に嵌合され、ケース2の上端縁と環状立ち上げ部22の端縁がレーザビーム溶接などで溶接され、その溶接部23にて密封状態で一体接合されている。 Upper lid 13, in oblong planar shape fitted to the inner periphery of the upper end portion of the case 2, an annular raised portion 22 to the entire circumference of the outer peripheral edge toward the outside (the side opposite to the electrode plate group 3) are rising formed, the upper lid 13 is fitted to the upper end of the case 2, the edges of the upper edge and the annular raised portion 22 of the case 2 is welded with such as a laser beam welding, the welded portion 23 It is integrally joined in a sealed state at.

上部蓋体13には、電極柱18が貫通する保持筒部24が一体的に立ち上げ形成されており、保持筒部24の内周と電極柱18の外周との間に絶縁ガスケット25を介装した状態で、保持筒部24の環状溝21に対応する部分を縮径加工して縮径変形部26を形成し、絶縁ガスケット25を圧縮させることで、電極柱18と保持筒部24の間が密封されている。 The upper lid 13, holding tubular portion 24 of the electrode post 18 penetrates the via insulating gasket 25 between the outer periphery of the inner periphery and the electrode posts 18 are formed to rise integrally, holding tubular portion 24 in instrumentation state, the holding tubular portion 24 of the portion corresponding to the annular groove 21 to diameter reduction to form a shrink deformation portion 26, by compressing the insulating gasket 25, an electrode post 18 of the holding tubular portion 24 between is sealed. また、上部蓋体13には、図2に示すように、ケース2内の内圧が一定以上になると破断して大気に開放する安全弁27、及びケース2内に電解液を注液する注液口28とその封止栓29が設けられている。 Further, the upper lid 13, as shown in FIG. 2, the safety valve 27 which opens to the atmosphere to break the internal pressure in the casing 2 is equal to or greater than the certain, and is injected the electrolytic solution into the case 2 liquid inlet 28 and the sealing plug 29 is provided.

また、緩衝部16がケース2と接触して短絡するのを防止するため、緩衝部16を覆う緩衝部カバー30が絶縁ガスケット25と一体形成されて設けられている。 Further, since the buffer portion 16 to prevent a short circuit in contact with the casing 2, the buffer cover 30 for covering the cushioning portion 16 is provided integrally formed with the insulating gasket 25. なお、絶縁ガスケット25と緩衝部カバー30は別々に構成しても良い。 The insulating gasket 25 and the buffer unit cover 30 may be configured separately. また、極板群3の上端部に露出している負極板5の芯材5a及び負極集電体8の外周部がケース2と接触して短絡するのを防止するため、負極集電体8及び負極板5の芯材5aの露出部の少なくとも外周部を覆う絶縁枠31が設けられている。 Further, in order to prevent the outer peripheral portion of the core 5a and the negative electrode collector 8 of the negative electrode plate 5 which is exposed to the upper end portion of the electrode plate group 3 is shorted in contact with the casing 2, the anode current collector 8 and insulating frame 31 covering at least the outer peripheral portion of the exposed portion of the core member 5a of the negative electrode plate 5 is provided.

以上の全体構成の角形電池1の極板群3において、図3、図4に示すように、正極板4の活物質を塗着した活物質塗着部41の幅寸法pに比して負極板5の活物質を塗着した活物質塗着部51の幅寸法nの方を大きく設定し、負極板5の活物質塗着部51の両側縁部を正極板4の活物質塗着部41の両側縁よりも外側に位置させることによって、負極板5の活物質塗着部51における金属リチウムの析出が防止されている。 In the electrode plate group 3 rectangular batteries 1 of the above overall structure, FIG. 3, as shown in FIG. 4, the negative electrode relative to the width p of the active material application portion 41 Nurigi the active material of the positive electrode plate 4 was set larger toward the width dimension n of the active material application portion 51 Nurigi the active material of the plate 5, the active material-application portion of the positive electrode plate 4 and the side edge portions of the active material application portion 51 of the negative electrode plate 5 by positioned outside the side edges 41, deposition of the metal lithium in the active material application portion 51 of the negative electrode plate 5 is prevented. また、正極板4と負極板5の間の介装されるセパレータ6は、その一側部が負極板5における活物質塗着部51の無地部52とは反対側の側縁よりも突出し、その他側縁が活物質塗着部51と無地部52との境界とほぼ合致するように、負極板5の活物質塗着部51の幅寸法よりも大きく設定されるとともにその配置位置が規制されている。 The separator 6 is protruded than the side edge opposite to the uncoated portion 52 of the active material application portion 51 one side of which the negative electrode plate 5 interposed between the positive electrode plate 4 and the negative electrode plate 5, as other side edge is substantially consistent with the boundary between the active material application portion 51 and the uncoated portion 52, its position is regulated while being set larger than the width of the active material application portion 51 of the negative electrode plate 5 ing. そして、正極板4及び負極板5の無地部42、52は、集電体7、8との確実な接合作業を確保するのに必要な寸法だけセパレータ6の両側縁よりも外側に突出するようにその幅寸法が設定されている。 The uncoated regions 42 and 52 of the positive electrode plate 4 and the negative electrode plate 5, so as to protrude outward from both side edges of only the separator 6 dimensions needed to ensure a reliable joining operation with the current collector 7 and 8 It is set the width dimension is.

従って、正極板4の無地部42のセパレータ6の側縁からの突出寸法をa、負極板5の無地部52とは反対側の側縁からのセパレータ6の突出寸法をb、負極板5の活物質塗着部51と無地部52の境界及びそれとほぼ合致しているセパレータ6の側縁からの負極板5の無地部52の突出寸法をd、正極板の塗着部の幅寸法をp、負極板の塗着部の幅寸法をn、正極板の活物質塗着部の両側縁からの負極板の活物質塗着部の突出寸法をそれぞれe、fとすると、正極板4の無地部42の側縁から負極板5の無地部52の側縁までの極板群の幅寸法Dは、負極板の活物質塗着部の幅寸法nを基準にすると、D=n+(a+b+d)で与えられる。 Therefore, the projection dimension from the side edge of the separator 6 of the uncoated portion 42 of the positive electrode plate 4 a, a projecting dimension of the separator 6 from the opposite side of the side edge and the uncoated portion 52 of the negative electrode plate 5 b, the negative electrode plate 5 the projecting dimension of the uncoated region 52 of the negative electrode plate 5 from the side edge of the active material application portion 51 and the uncoated region 52 a separator 6 that substantially meets the boundary and that of d, p the width of the coating portion of the positive electrode plate , the width of the coating portion of the negative electrode plate n, e the projecting dimension of the active material-application portion of the negative electrode plate from opposite side edges of the active material-application portion of the positive electrode plate, respectively, when is f, plain positive electrode plate 4 width dimension D of the electrode plate assembly from the side edge to the side edge of the uncoated portion 52 of the negative electrode plate 5 parts 42, when referenced to the width dimension n of the active material-application portion of the negative electrode plate, D = n + (a + b + d) It is given by.

なお、以上のようにセパレータ6の側縁を活物質塗着部51と無地部52との境界にほぼ合致させた状態で巻回しながら正極板4と負極板5の絶縁を実現できるのは、負極板5の活物質塗着部51の厚さが、例えば従来の民生用のリチウム電池では160〜200μm程度であったものが、80〜100μm程度と薄くなり、かつ活物質塗着部51における活物質の脱落の恐れが少なくなったこと、及び正極板4と負極板5とセパレータ6を重ねて巻回する際の巻回精度が高くなったことによる。 The reason can be realized insulation of the positive electrode plate 4 and the negative electrode plate 5 while winding in a state in which almost is matched to the boundary between the active material application portion 51 and the uncoated region 52 a side edge of the separator 6 as described above, the thickness of the active material application portion 51 of the negative electrode plate 5 is, for example, those was about 160~200μm is a lithium battery for a conventional consumer, becomes thin as about 80 to 100, and in the active material application portion 51 the risk of separation of the active material is low, and due to the fact that the winding precision in winding becomes higher overlapped positive electrode plate 4 and the negative electrode plate 5 and the separator 6.

以上の本実施形態の角形電池1によれば、負極板5における活物質塗着部51と無地部52との境界とセパレータ6の側縁とをほぼ合致させた状態で巻回して極板群3を構成しているが、負極板5の活物質塗着部51の幅寸法nは正極板4の活物質塗着部41の幅寸法pよりも大きく、負極板5の活物質塗着部51の両側部は正極板4の活物質塗着部41の側縁よりも所定の幅寸法eとfだけそれぞれ突出している。 According to the prismatic battery 1 of the present embodiment described above, the electrode plate group wound in a state in which substantially align your and side edges of the boundary and the separator 6 between the active material application portion 51 and the non-coating portion 52 in the negative electrode 5 3 constitute that although the width dimension n of the active material application portion 51 of the negative electrode plate 5 is greater than the width p of the active material application portion 41 of the positive electrode plate 4, the active material-application portion of the negative electrode plate 5 both sides of the 51 protrudes respective predetermined width e and f of the side edges of the active material application portion 41 of the positive electrode plate 4. そのため、セパレータ6の側縁を負極板5における活物質塗着部51と無地部52との境界までほぼ寸法fだけ延出させていることで、このセパレータ6にて正極板4の活物質塗着部41の側縁と負極板5との間の短絡を防止することができる。 Therefore, by which is extended by approximately the dimension f of the side edges of the separator 6 to the boundary between the active material application portion 51 and the non-coating portion 52 in the negative electrode 5, the active material coating the positive electrode plate 4 at the separator 6 it is possible to prevent a short circuit between the side edge and the negative electrode plate 5 of the wearing portion 41.

しかも、セパレータ6が負極板5における活物質塗着部51と無地部52との境界から突出しないので、従来、負極板5の活物質塗着部51と無地部52との境界から突出していたセパレータ6の突出寸法cを節減でき、かつセパレータ6から突出させる無地部52の突出寸法dは基本的に変わらないので、極板群3の幅寸法Dは、上記のようにD=n+(a+b+d)となり、従来に比してセパレータ6の突出寸法cの低減分だけ小さくできる。 Moreover, the separator 6 is does not protrude from the boundary between the active material application portion 51 and the non-coating portion 52 in the negative electrode 5, conventionally, it was not protrude from the boundary between the active material application portion 51 and the uncoated portion 52 of the negative electrode plate 5 can save protrusion dimension c of the separator 6, and since the projecting distance d of the non-coating portion 52 to protrude from the separator 6 is essentially unchanged, the width dimension of the electrode plate group 3 D, as described above D = n + (a + b + d ), and it can be reduced by the amount of decrease in the projecting dimension c of the separator 6 as compared with the conventional. またそれに伴って電池サイズを小さくすることができ、若しくは同一電池サイズでは活物質塗着部の寸法を大きくできて電池容量を大きくすることができる。 Also it is possible to reduce the battery size accordingly, or it is possible to increase the battery capacity can increase the size of the active material-application portion in the same cell size. 例えば、正極板4の活物質塗着部41の幅寸法が30〜50mm程度の電池の場合で、b寸法やc寸法は2〜3mm程度であり、従ってその場合には5%程度電池サイズの低減し若しくは電池容量を大きくすることができる。 For example, the width of the active material application portion 41 of the positive electrode plate 4 is in the case of batteries of about 30 to 50 mm, b dimensions and dimension c is about 2 to 3 mm, therefore the battery size approximately 5% when the reduced or battery capacity can be increased.

また、本実施形態の角形電池1では、ケース2内に収容された極板群3の一端に接合された負極集電体8に緩衝部16を介して電極端子としての電極柱18を装着し、ケース2に一体固着した上部蓋体13の電極柱貫通部に保持筒部24を設け、保持筒部24の内周と電極柱18の外周との間に絶縁ガスケット25を介装し、保持筒部24をかしめて形成した縮径変形部26によって電極柱18と保持筒部24の間に介装された絶縁ガスケット25を圧縮させて密封性を確保しているので、ケース2や上部蓋体13の寸法公差などによる電極柱18と保持筒部24の位置ずれを緩衝部16による電極柱18の変位によって無理なく吸収することができ、そのため電極柱18と保持筒部24との間に介装された絶縁ガスケット25が不均等に圧 Moreover, the prismatic battery 1 of this embodiment, the anode current collector 8 which is joined to one end of the electrode plate group 3 accommodated in the case 2 via the buffer portion 16 of the electrode posts 18 as an electrode terminal mounted the holding tubular portion 24 to the electrode column through portion of the upper lid 13 which is integrally fixed to the case 2 is provided, interposed an insulating gasket 25 between the outer periphery of the inner periphery and the electrode posts 18 of the holding tubular portion 24, the holding since the cylindrical portion 24 is secured sealability by compressing the interposed an insulating gasket 25 between the holding tubular portion 24 and the electrode posts 18 by shrink deformation portion 26 formed by crimping, the case 2 and the upper lid the positional deviation of the holding tubular portion 24 and the electrode posts 18 due dimensional tolerance of the body 13 can be absorbed without difficulty by the displacement of the electrode column 18 by the buffer section 16, between the order and the electrode post 18 and the holding tubular portion 24 interposed an insulating gasket 25 is unevenly pressure されるというような不具合を生じる恐れがなく、信頼性の高い密封性を確保することができる。 No fear be problems such that they are, it is possible to ensure reliable sealing performance.

また、電極柱18に衝撃的な外力が作用した場合にも絶縁ガスケット25による密封部を中心として電極柱18が容易に揺動変位することよって吸収でき、密封性に致命的な影響を与えず、安定的に密封性を確保することができる。 Further, even if the shocking external force is applied to the electrode posts 18 it can absorb me by the electrode post 18 is easily swings around the sealing portion by the insulating gasket 25, without causing catastrophic effect on sealability , it is possible to secure a stable sealing property.

また、緩衝部16とケース2の接触を防止する緩衝部カバー30を絶縁ガスケット25と一体に設けているので、緩衝部16がケース2と接触して短絡するのを緩衝部カバー30にて確実に防止できるとともに、絶縁ガスケット25と一体に設けているので部品点数が少なくて済み、部品コスト及び組み付け工数を低減することができる。 Further, since the buffer section cover 30 to prevent contact of the buffer section 16 and the case 2 are formed integrally with the insulating gasket 25, ensures that the cushioning portion 16 is shorted in contact with the casing 2 with the buffer cover 30 can be prevented, since is provided integrally with the insulating gasket 25 requires less parts, it is possible to reduce the parts costs and assembling steps.

また、極板群3の一端に接合された負極集電体8の少なくとも外周部及び極板群3の一端部の負極板5の芯材5aの露出部を覆うように絶縁枠31を嵌合させているので、極板群3の負極板5の芯材5aの露出部がケース2と接触して短絡するのを絶縁枠31にて確実に防止できる。 Furthermore, fitting the insulating frame 31 so as to cover the exposed portion of at least the outer peripheral portion and the core 5a of the negative electrode plate 5 at one end of the electrode plate group 3 of the negative electrode current collector 8 which is joined to one end of the electrode plate group 3 since then, the exposed portion of the core 5a of the negative electrode plate 5 of the electrode plate group 3 is a short circuit in contact with the casing 2 can be reliably prevented by the insulating frame 31.

また、正極集電体7及び負極集電体8に、接合突部11、12、14、15を突設しているので、正極板4及び負極板5の無地部42、52に対して集電体7、8が確実に圧接され、その部分で溶接することによって確実に接合でき、接続抵抗の小さい接続状態を確保することができ、特に両端の半円部に半径方向に接合突部11、14を設けているので、断面形状長円形に巻回した極板群3の折り返し部でも高い集電効率を確保することができる。 Also, the positive electrode collector 7 and the negative electrode current collector 8, since the protruded bonding projections 11, 12, 14, 15, current with respect to uncoated portions 42 and 52 of the positive electrode plate 4 and the negative electrode plate 5 is reliably pressed against conductors 7,8 can reliably joined by welding at the portion, a small connection state of connection resistance can be secured, joining projection 11 radially particularly semicircular portion at both ends because are provided 14, it is possible to secure a high current collecting efficiency even in the folded portion of the electrode plate group 3 wound in a cross-sectional shape oval.

また、正極集電体7がケース2の下部蓋体を兼用しているので、構成が簡単で部品点数を少なくでき、かつ組み付け工数も少なくて済むのでコスト低減を図ることができ、しかもその正極集電体7に適当間隔おきにほぼ全幅にわたって形成した接合突部12によって正極集電体7、即ち下部蓋体の面剛性を高くすることができ、正極集電体7の板厚を大きくしなくても、ケース2の内圧が上昇した時の膨張を抑制することができ、コストと重量の低減を図ることができる。 Further, since the positive electrode current collector 7 also serves as a lower lid of the case 2, the configuration can reduce the number of parts is simple, and assembling steps also less able to reduce the cost because the need, moreover its positive collector 7 positive electrode current collector 7 by bonding projections 12 formed over substantially the entire width in appropriate intervals, ie it is possible to increase the surface rigidity of the lower lid, increasing the thickness of the positive electrode current collector 7 without, it is possible to suppress the expansion when the internal pressure of the case 2 rises, it is possible to reduce the cost and weight.

以上の実施形態の説明では角形電池1の例を示したが、本発明は角形電池に限らず、円筒型のリチウム電池に対しても同様に適用できるとともに、同様の作用効果を奏することは改めて説明するまでもなく明らかである。 Above in the description of the embodiment has shown an example of a rectangular battery 1, the present invention is not limited to a rectangular battery, it is possible to similarly applied to a lithium battery of a cylindrical, anew it can provide a similar effect description until it is clear no.

本発明のリチウム二次電池は、セパレータの側縁を負極板における活物質塗着部と無地部との境界にほぼ合致させているので、この境界から突出していたセパレータの突出寸法を節減でき、その分電池サイズを小さくでき若しくは同一電池サイズでは活物質塗着部の寸法を大きくできて電池容量を大きくすることができるという効果が得られ、円筒型や角形などの各種リチウム二次電池に有用である。 The lithium secondary battery of the present invention, since substantially to conform to the boundary between the active material-application portion and the uncoated portion of the negative electrode plate side edges of the separator, can save protrusion dimension of separator protrude from the boundary, effect is obtained that the in minute cell size can be made smaller or the same cell size can be increased battery capacity can increase the size of the active material-application portion, useful in various lithium secondary batteries, such as cylindrical or prismatic it is.

本発明のリチウム二次電池の一実施形態の角形電池の全体構成を示し、(a)は平面図、(b)は縦断正面図である。 Showing the overall structure of a prismatic battery of one embodiment of the lithium secondary battery of the present invention, (a) is a plan view, (b) vertical sectional front view. 同実施形態の角形電池の分解斜視図である。 It is an exploded perspective view of a prismatic battery of the embodiment. 同実施形態の角形電池の極板群の構成を示す模式図である。 It is a schematic diagram showing a configuration of an electrode assembly of a prismatic battery of the embodiment. 同実施形態の極板群における正極板と負極板とセパレータの寸法関係を模式的に示した説明図であって、(a)は展開状態の説明図、(b)は断面説明図である。 A diagram of the dimensions of the positive and negative electrode plates and the separator relationship electrode plate group of the same embodiment shown schematically, (a) shows the illustration of the deployment state, (b) is a sectional view. 従来例の極板群における正極板と負極板とセパレータの寸法関係を模式的に示した説明図であって、(a)は展開状態の説明図、(b)は断面説明図である。 The conventional positive and negative electrode plates and the separator dimensional relationship in the electrode plate group of a diagram schematically showing, (a) shows the illustration of the deployment state, (b) is a sectional view.

符号の説明 DESCRIPTION OF SYMBOLS

1 角形電池(リチウム二次電池) 1 rectangular batteries (lithium secondary battery)
3 極板群 4 正極板 5 負極板 6 セパレータ 41 活物質塗着部 42 無地部 51 活物質塗着部 52 無地部 3 the electrode plate group 4 positive electrode plate 5 negative electrode plate 6 separator 41 active material application portion 42 uncoated region 51 active material application portion 52 uncoated region

Claims (1)

  1. 幅方向の一端部に活物質を塗着していない無地部を形成した正極板と負極板とを、それぞれの活物質塗着部をセパレータを介して対向させ、かつ前記正負両極板のそれぞれの無地部を互いに反対方向に突出させた状態で巻回して成る極板群を備えたリチウム二次電池において、前記負極板の活物質塗着部の幅は前記正極板の活物質塗着部の幅より大きく設定し、前記負極板における活物質塗着部と無地部との境界とセパレータの側縁とをほぼ合致させた状態で巻回して極板群を構成したことを特徴とするリチウム二次電池。 The positive electrode plate and the negative electrode plate to form a non-coating portion that is not Nurigi the active material on one end portion in the width direction, each of the active material-application portion are opposed via a separator, and each of the positive and negative electrodes plates in the lithium secondary battery including the electrode plate group formed by winding a non-coating portion in a state of protruding in opposite directions, the width of the active material-application portion of the negative electrode plate is the positive plate active material application portion of is set greater than the width, characterized in that constitutes the negative active material-application portion of the electrode plate and the winding turn by the electrode plate group in a state of substantially align your and side edges of the boundary and the separator between the uncoated region lithium secondary The following battery.
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