JP2016110947A - Lithium ion secondary battery - Google Patents

Lithium ion secondary battery Download PDF

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JP2016110947A
JP2016110947A JP2014250123A JP2014250123A JP2016110947A JP 2016110947 A JP2016110947 A JP 2016110947A JP 2014250123 A JP2014250123 A JP 2014250123A JP 2014250123 A JP2014250123 A JP 2014250123A JP 2016110947 A JP2016110947 A JP 2016110947A
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current collector
secondary battery
lithium ion
ion secondary
metal foil
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JP6409546B2 (en
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英二 水谷
Eiji Mizutani
英二 水谷
元章 奥田
Motoaki Okuda
元章 奥田
泰有 秋山
Yasunari Akiyama
泰有 秋山
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Toyota Industries Corp
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Toyota Industries 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of suppressing deflection of a collector.SOLUTION: A lithium ion secondary battery 1 comprises at least a pair of electrodes 30 and 40. The electrode 30 includes: a rectangular shaped collector 32 that is formed by a rolled metal foil; and a tab part 34 that is projected from a long side 32A of the collector 32. The electrode 30 is arranged so that a short side direction of the collector 32 is along with a vertical direction D. A rolling direction R of the metal foil is along with the short side direction of collector 32.SELECTED DRAWING: Figure 3

Description

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

例えば、特許文献１に記載されたリチウムイオン二次電池は、圧延された金属箔から形成された長方形状の集電体と、集電体の短辺から突出するタブ部と、を有する複数の電極を備えている。   For example, a lithium ion secondary battery described in Patent Document 1 includes a plurality of rectangular current collectors formed from rolled metal foil, and a tab portion protruding from the short side of the current collector. It has an electrode.

特開２０１１−５４３３９号公報JP 2011-54339 A

上記特許文献１のリチウムイオン二次電池において、集電体の短辺方向が鉛直方向に沿うように電極を配置した場合、集電体が自重により短辺方向にたわんでしまうことがある。この場合、電極の配置位置が目標位置からずれてしまうおそれがある。   In the lithium ion secondary battery of Patent Document 1, when the electrodes are arranged so that the short side direction of the current collector is along the vertical direction, the current collector may bend in the short side direction by its own weight. In this case, the arrangement position of the electrodes may be shifted from the target position.

本発明は、上記事情に鑑みてなされたものであり、集電体のたわみを抑制できるリチウムイオン二次電池を提供することを目的とする。   This invention is made | formed in view of the said situation, and it aims at providing the lithium ion secondary battery which can suppress the bending of a collector.

本発明の一側面に係るリチウムイオン二次電池は、少なくとも一対の電極を備えるリチウムイオン二次電池であって、電極は、圧延された金属箔から形成された長方形状の集電体と、集電体の長辺から突出するタブ部と、を有し、電極は、集電体の短辺方向が鉛直方向に沿うように配置されており、金属箔の圧延方向は、集電体の短辺方向に沿っている。   A lithium ion secondary battery according to one aspect of the present invention is a lithium ion secondary battery including at least a pair of electrodes, and the electrodes include a rectangular current collector formed from a rolled metal foil, and a current collector. And a tab portion protruding from the long side of the electric body, the electrode is arranged such that the short side direction of the current collector is along the vertical direction, and the rolling direction of the metal foil is the short side of the current collector. Along the side direction.

このリチウムイオン二次電池では、金属箔の圧延方向が集電体の短辺方向に沿っている。圧延された金属箔は、圧延方向と直交する方向と比較して、圧延方向に沿う方向に曲がり難い。したがって、このリチウムイオン二次電池では、集電体が短辺方向に曲がり難くなっている。このため、集電体の短辺方向が鉛直方向に沿うように電極を配置したとしても、集電体が自重により短辺方向にたわむことが抑制される。   In this lithium ion secondary battery, the rolling direction of the metal foil is along the short side direction of the current collector. Compared with the direction orthogonal to the rolling direction, the rolled metal foil is less likely to bend in the direction along the rolling direction. Therefore, in this lithium ion secondary battery, it is difficult for the current collector to bend in the short side direction. For this reason, even if it arrange | positions an electrode so that the short side direction of a collector may follow a perpendicular direction, it suppresses that a collector bends in a short side direction by dead weight.

また、本発明の一側面に係るリチウムイオン二次電池では、集電体とタブ部とは、一体に形成されていることが好ましい。この場合、部品点数を削減できると共に、集電体とタブ部とを接続する工程を省略できる。   In the lithium ion secondary battery according to one aspect of the present invention, it is preferable that the current collector and the tab portion are integrally formed. In this case, the number of parts can be reduced, and the step of connecting the current collector and the tab portion can be omitted.

本発明によれば、金属箔のたわみを抑制できるリチウムイオン二次電池を提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the lithium ion secondary battery which can suppress the bending of metal foil can be provided.

図１は、本発明の一実施形態に係るリチウムイオン二次電池の模式的断面図である。FIG. 1 is a schematic cross-sectional view of a lithium ion secondary battery according to an embodiment of the present invention. 図２は、図１のＩＩ−ＩＩ線における模式的断面図である。FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. 図３中の（ａ）（図３（ａ））は、負極の模式的斜視図であり、図３中の（ｂ）（図３（ｂ））は、集電体及びタブ部の模式的正面図であり、図３中の（ｃ）（図３（ｃ））は、図３（ｂ）のＣ部の拡大図である。3A (FIG. 3A) is a schematic perspective view of the negative electrode, and FIG. 3B (FIG. 3B) is a schematic view of the current collector and the tab portion. FIG. 3C is a front view, and FIG. 3C (FIG. 3C) is an enlarged view of a portion C in FIG. 3B.

以下、添付図面を参照して、本発明の好適な実施形態について詳細に説明する。図面の説明において同一又は相当要素には同一符号を付し、重複する説明は省略する。   Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same or corresponding elements will be denoted by the same reference numerals, and redundant description will be omitted.

図１は、本発明の一実施形態に係るリチウムイオン二次電池１の模式的断面図である。図２は、図１のＩＩ−ＩＩ線における模式的断面図である。図３（ａ）は、負極３０の模式的斜視図であり、図３（ｂ）は、集電体３２及びタブ部３４の模式的正面図であり、図３（ｃ）は、図３（ｂ）のＣ部の拡大図である。図１及び図３（ｂ）において、矢印Ｄは鉛直方向を示している。   FIG. 1 is a schematic cross-sectional view of a lithium ion secondary battery 1 according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view taken along line II-II in FIG. FIG. 3A is a schematic perspective view of the negative electrode 30, FIG. 3B is a schematic front view of the current collector 32 and the tab portion 34, and FIG. It is an enlarged view of the C section of b). In FIG.1 and FIG.3 (b), the arrow D has shown the perpendicular direction.

図１及び図２に示すように、リチウムイオン二次電池１は、ケース１０と電極組立体２０とを備えている。ケース１０は、例えば略直方体状の筐体である。ケース１０は、例えばアルミニウム等の金属から形成されている。ケース１０は、鉛直上方に開口した本体部１２と、本体部１２の開口を塞ぐ蓋部１４と、を有している。   As shown in FIGS. 1 and 2, the lithium ion secondary battery 1 includes a case 10 and an electrode assembly 20. The case 10 is, for example, a substantially rectangular parallelepiped housing. The case 10 is made of a metal such as aluminum. The case 10 includes a main body portion 12 that opens vertically upward, and a lid portion 14 that closes the opening of the main body portion 12.

電極組立体２０は、ケース１０内に収容されている。電極組立体２０は、負極３０及び正極４０（一対の電極）と、負極３０と正極４０との間に配置されたセパレータ５０と、を有している。負極３０及び正極４０は、互いの間にセパレータ５０を介しつつ、水平方向に沿って交互に積層されている。セパレータ５０は、例えば微多孔膜であり、電解液を保持している。電解液は、例えば有機溶媒系又は非水系の電解液である。また、ケース１０の内部の空間は、電解液で満たされていてよい。   The electrode assembly 20 is accommodated in the case 10. The electrode assembly 20 includes a negative electrode 30 and a positive electrode 40 (a pair of electrodes), and a separator 50 disposed between the negative electrode 30 and the positive electrode 40. The negative electrode 30 and the positive electrode 40 are alternately stacked along the horizontal direction with the separator 50 interposed therebetween. The separator 50 is a microporous film, for example, and holds an electrolytic solution. The electrolytic solution is, for example, an organic solvent-based or non-aqueous electrolytic solution. The space inside the case 10 may be filled with an electrolytic solution.

図３（ａ）及び図３（ｂ）に示すように、負極３０は、長方形状の集電体３２と、タブ部３４と、を有している。集電体３２及びタブ部３４は、金属箔（例えば銅箔）から形成されている。タブ部３４は、例えば長方形状（矩形状）である。タブ部３４は、集電体３２の長辺３２Ａから突出している。より具体的には、タブ部３４は、集電体３２の長辺方向（長辺３２Ａが延びる方向）における一方側から突出している。また、タブ部３４は、集電体３２の短辺方向（短辺３２Ｂが延びる方向）に沿って鉛直上方へ突出している。タブ部３４は、タブ部３４の長辺方向が集電体３２の短辺方向に沿うように設けられている。この例では、集電体３２とタブ部３４とは、一体に形成されている。具体的には、集電体３２及びタブ部３４は、例えば、圧延された金属箔から一括して切り出されることにより形成されている。   As illustrated in FIGS. 3A and 3B, the negative electrode 30 includes a rectangular current collector 32 and a tab portion 34. The current collector 32 and the tab portion 34 are formed from a metal foil (for example, a copper foil). The tab portion 34 has, for example, a rectangular shape (rectangular shape). The tab portion 34 protrudes from the long side 32 </ b> A of the current collector 32. More specifically, the tab portion 34 protrudes from one side of the current collector 32 in the long side direction (the direction in which the long side 32A extends). Further, the tab portion 34 projects vertically upward along the short side direction of the current collector 32 (the direction in which the short side 32B extends). The tab portion 34 is provided such that the long side direction of the tab portion 34 is along the short side direction of the current collector 32. In this example, the current collector 32 and the tab portion 34 are integrally formed. Specifically, the current collector 32 and the tab portion 34 are formed, for example, by being collectively cut out from a rolled metal foil.

図１に示すように、負極３０は、集電体３２の短辺方向が鉛直方向Ｄに沿うように配置されている。負極３０は、タブ部３４において導電部材６０に電気的に接続されている。この導電部材６０は、ケース１０の蓋部１４を貫通するように配置された負極端子６２に電気的に接続されている。すなわち、負極３０は、導電部材６０を介して負極端子６２に電気的に接続されている。蓋部１４と負極端子６２との間は、絶縁部材６４Ａ及び絶縁部材６４Ｂによって絶縁されている。   As shown in FIG. 1, the negative electrode 30 is arranged such that the short side direction of the current collector 32 is along the vertical direction D. The negative electrode 30 is electrically connected to the conductive member 60 at the tab portion 34. The conductive member 60 is electrically connected to a negative electrode terminal 62 disposed so as to penetrate the lid portion 14 of the case 10. That is, the negative electrode 30 is electrically connected to the negative electrode terminal 62 via the conductive member 60. The lid 14 and the negative electrode terminal 62 are insulated by an insulating member 64A and an insulating member 64B.

また、負極３０は、集電体３２を覆う負極活物質層３６を有している。負極活物質層３６は、集電体３２の片面又は両面を覆ってよく、この例では両面を覆っている。負極活物質層３６は、例えば、グラファイト若しくはハードカーボン等の炭素系材料、リチウムと合金化する元素（Ｓｎ若しくはＳｉ）、リチウムと合金化する元素を有する元素化合物、又は、ポリアセチレン若しくはポリピロール等の高分子材料から形成される。負極活物質層３６は、集電体３２に活物質ペーストを塗工し、乾燥させることにより形成される。   The negative electrode 30 has a negative electrode active material layer 36 that covers the current collector 32. The negative electrode active material layer 36 may cover one surface or both surfaces of the current collector 32, and in this example, covers both surfaces. The negative electrode active material layer 36 is made of, for example, a carbon-based material such as graphite or hard carbon, an element that forms an alloy with lithium (Sn or Si), an element compound that includes an element that forms an alloy with lithium, or a high content such as polyacetylene or polypyrrole. Formed from molecular material. The negative electrode active material layer 36 is formed by applying an active material paste to the current collector 32 and drying it.

集電体３２及びタブ部３４は、上述したように、圧延された金属箔から形成されている。ここで、図３（ｂ）及び図３（ｃ）に示すように、集電体３２及びタブ部３４を構成する金属箔の圧延方向Ｒは、集電体３２の短辺方向に、すなわち鉛直方向Ｄに沿っている。金属箔の圧延方向とは、圧延工程において、一対のロール間に金属箔を通過させて加圧する際に金属箔が延びる方向を意味する。金属箔の圧延方向Ｒと鉛直方向Ｄとは、例えば平行であってもよい。つまり、金属箔の圧延方向Ｒと鉛直方向Ｄとは、一致していてもよい。なお、負極３０は、例えば、圧延された金属箔から切り出された集電体３２上に活物質ペーストを塗工し、乾燥させることにより形成されてもよい。或いは、負極３０は、活物質ペーストが塗工された金属箔を一対のロール間に通過させて圧延した後、金属箔を集電体３２及びタブ部３４の形状に切り出すことにより形成されてもよい。   As described above, the current collector 32 and the tab portion 34 are formed from a rolled metal foil. Here, as shown in FIGS. 3B and 3C, the rolling direction R of the metal foil constituting the current collector 32 and the tab portion 34 is in the short side direction of the current collector 32, that is, vertical. Along the direction D. The rolling direction of the metal foil means a direction in which the metal foil extends when the metal foil is pressed between a pair of rolls and pressed in the rolling process. The rolling direction R and the vertical direction D of the metal foil may be parallel, for example. That is, the rolling direction R and the vertical direction D of the metal foil may coincide with each other. The negative electrode 30 may be formed, for example, by applying an active material paste on a current collector 32 cut out from a rolled metal foil and drying it. Alternatively, the negative electrode 30 may be formed by passing the metal foil coated with the active material paste between a pair of rolls and rolling it, and then cutting the metal foil into the shape of the current collector 32 and the tab portion 34. Good.

図３（ｃ）に示すように、圧延された金属箔においては、金属箔を構成する結晶粒７０が圧延方向Ｒに沿って延ばされている。これにより、例えば、圧延方向Ｒの結晶粒径（圧延方向における結晶粒７０の最大長さ）が、圧延方向Ｒと直交する方向の結晶粒径（圧延方向と直交する方向における結晶粒７０の最大長さ）よりも長くなっている。金属箔の圧延方向Ｒは、結晶粒７０の配向方向と言い換えてもよい。   As shown in FIG. 3 (c), in the rolled metal foil, crystal grains 70 constituting the metal foil are extended along the rolling direction R. Thereby, for example, the crystal grain size in the rolling direction R (the maximum length of the crystal grain 70 in the rolling direction) is the crystal grain size in the direction perpendicular to the rolling direction R (the maximum grain size in the direction perpendicular to the rolling direction). Is longer than (length). The rolling direction R of the metal foil may be rephrased as the orientation direction of the crystal grains 70.

続いて、正極４０について説明する。正極４０は、負極３０と左右対称な形状を有している。以下、正極４０について、負極３０と異なる点について説明し、同一である点については説明を省略する。   Subsequently, the positive electrode 40 will be described. The positive electrode 40 has a symmetrical shape with the negative electrode 30. Hereinafter, the difference between the positive electrode 40 and the negative electrode 30 will be described, and the description of the same points will be omitted.

正極４０は、長方形状の集電体と、タブ部４４と、を有している。正極４０の集電体及びタブ部４４は、金属箔（例えばアルミニウム箔）から形成されている。正極４０では、タブ部４４は、集電体の長辺方向における他方側（負極３０のタブ部３４が突出する側と反対側）から突出している。正極４０は、導電部材６０を介して正極端子６６に電気的に接続されている。蓋部１４と正極端子６６との間は、絶縁部材６４Ａ及び絶縁部材６４Ｂによって絶縁されている。また、正極４０は、集電体を覆う正極活物質層４６を有している。正極活物質層４６は、集電体の片面又は両面を覆ってよく、この例では両面を覆っている。正極活物質層４６は、例えば、リチウム及び遷移金属を含む複合酸化物（Ｌｉ、Ｎｉ、Ｃｏ及びＭｎを含む酸化物等）から形成される。   The positive electrode 40 includes a rectangular current collector and a tab portion 44. The current collector and the tab portion 44 of the positive electrode 40 are formed from a metal foil (for example, an aluminum foil). In the positive electrode 40, the tab portion 44 protrudes from the other side in the long side direction of the current collector (the side opposite to the side where the tab portion 34 of the negative electrode 30 protrudes). The positive electrode 40 is electrically connected to the positive electrode terminal 66 through the conductive member 60. The lid 14 and the positive electrode terminal 66 are insulated by an insulating member 64A and an insulating member 64B. The positive electrode 40 has a positive electrode active material layer 46 that covers the current collector. The positive electrode active material layer 46 may cover one surface or both surfaces of the current collector, and in this example, covers both surfaces. The positive electrode active material layer 46 is formed of, for example, a composite oxide containing lithium and a transition metal (such as an oxide containing Li, Ni, Co, and Mn).

以上説明したリチウムイオン二次電池１の作用効果を説明する。以下、負極３０を参照して説明するが、正極４０についても同様の作用効果を奏する。   The effect of the lithium ion secondary battery 1 demonstrated above is demonstrated. Hereinafter, although it demonstrates with reference to the negative electrode 30, there exists the same effect also about the positive electrode 40. FIG.

リチウムイオン二次電池１では、集電体３２を構成する金属箔の圧延方向Ｒが集電体３２の短辺方向に沿っている。圧延された金属箔は、圧延方向Ｒと直交する方向と比較して、圧延方向Ｒに沿う方向に曲がり難い。したがって、リチウムイオン二次電池１では、集電体３２が短辺方向に曲がり難くなっている。このため、集電体３２の短辺方向が鉛直方向Ｄに沿うように負極３０（電極）を配置したとしても、集電体３２が自重により短辺方向にたわむことが抑制される。   In the lithium ion secondary battery 1, the rolling direction R of the metal foil constituting the current collector 32 is along the short side direction of the current collector 32. Compared with the direction orthogonal to the rolling direction R, the rolled metal foil is less likely to bend in the direction along the rolling direction R. Therefore, in the lithium ion secondary battery 1, the current collector 32 is difficult to bend in the short side direction. For this reason, even if the negative electrode 30 (electrode) is arranged so that the short side direction of the current collector 32 is along the vertical direction D, the current collector 32 is suppressed from being bent in the short side direction by its own weight.

特に、リチウムイオン二次電池１では、製造時において負極３０及び正極４０を積層する際に、並べられた集電体３２が自重によって短辺方向にたわんでしまうことが考えられる。この点、リチウムイオン二次電池１によれば、積層時に集電体３２がたわんでしまうことを抑制できる。   In particular, in the lithium ion secondary battery 1, when the negative electrode 30 and the positive electrode 40 are stacked at the time of manufacture, the arranged current collectors 32 may bend in the short side direction due to their own weight. In this regard, according to the lithium ion secondary battery 1, it is possible to suppress the current collector 32 from being bent at the time of stacking.

また、リチウムイオン二次電池１では、集電体３２とタブ部３４とが一体に形成されている。このため、例えば、集電体３２とタブ部３４とを別部材として用意し、接合等の後工程によって接続する場合と比較して、部品点数を削減できる。また、集電体３２とタブ部３４とを接続する工程を省略できる。   In the lithium ion secondary battery 1, the current collector 32 and the tab portion 34 are integrally formed. For this reason, for example, the number of parts can be reduced compared with the case where the current collector 32 and the tab portion 34 are prepared as separate members and connected in a subsequent process such as joining. Further, the step of connecting the current collector 32 and the tab portion 34 can be omitted.

また、リチウムイオン二次電池１では、タブ部３４は、集電体３２の長辺３２Ａから鉛直上方へ突出している。したがって、例えば、タブ部３４が集電体３２の短辺３２Ｂから水平方向へ突出する場合と比較して、ケース１０内において電極組立体２０の水平方向外側に形成されるデッドスペースを小さくすることができる。   In the lithium ion secondary battery 1, the tab portion 34 protrudes vertically upward from the long side 32 </ b> A of the current collector 32. Therefore, for example, as compared with the case where the tab portion 34 protrudes in the horizontal direction from the short side 32B of the current collector 32, the dead space formed outside the electrode assembly 20 in the horizontal direction in the case 10 is reduced. Can do.

また、リチウムイオン二次電池１では、集電体３２の短辺方向が鉛直方向Ｄに沿っており、タブ部３４が集電体３２の長辺３２Ａから鉛直上方へ突出している。仮に、集電体３２の長辺方向が鉛直方向Ｄに沿うと共に、タブ部３４が集電体３２の短辺３２Ｂから鉛直上方へ突出する場合、集電体３２の下部とタブ部３４との距離が離れるので、集電体３２の下部においてはリチウムイオンが流れ難くなる。このため、集電体３２の下部が充放電に寄与し難くなる。一方、本実施形態では、集電体３２の短辺方向が鉛直方向Ｄに沿っており、タブ部３４が集電体３２の長辺３２Ａから鉛直上方へ突出していることから、集電体３２の鉛直方向Ｄにおける長さを小さくすることができる。つまり、集電体３２の下部とタブ部３４との距離を近くすることができる。これにより、リチウムイオンを集電体３２の下部にまで流れ易くすることができる。   In the lithium ion secondary battery 1, the short side direction of the current collector 32 is along the vertical direction D, and the tab portion 34 protrudes from the long side 32 </ b> A of the current collector 32 vertically upward. If the long side direction of the current collector 32 is along the vertical direction D and the tab portion 34 protrudes vertically upward from the short side 32B of the current collector 32, the lower portion of the current collector 32 and the tab portion 34 Since the distance is long, lithium ions hardly flow in the lower part of the current collector 32. For this reason, it becomes difficult for the lower part of the electrical power collector 32 to contribute to charging / discharging. On the other hand, in the present embodiment, since the short side direction of the current collector 32 is along the vertical direction D, and the tab portion 34 protrudes vertically upward from the long side 32A of the current collector 32, the current collector 32. The length in the vertical direction D can be reduced. That is, the distance between the lower portion of the current collector 32 and the tab portion 34 can be reduced. As a result, the lithium ions can easily flow to the lower part of the current collector 32.

以上、本発明の好適な実施形態について説明したが、本発明は、上記実施形態に限られるものではない。   The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

例えば、上記実施形態では、負極３０及び正極４０の双方において、集電体を構成する金属箔の圧延方向が集電体の短辺方向に沿っている例を説明したが、負極３０及び正極４０（一対の電極）の少なくとも一方において、金属箔の圧延方向が集電体の短辺方向に沿っていればよい。また、集電体３２とタブ部３４とが一体に形成されておらず、別部材として形成され、後工程において接続されてもよい。この場合、タブ部３４は、圧延された金属箔から形成されてもよいし、例えば電解金属箔から形成されてもよい。また、負極３０及び正極４０の一方のみの集電体が、圧延された金属箔から形成されてもよい。   For example, in the above embodiment, the example in which the rolling direction of the metal foil constituting the current collector is along the short side direction of the current collector in both the negative electrode 30 and the positive electrode 40 has been described. In at least one of the pair of electrodes, the rolling direction of the metal foil may be along the short side direction of the current collector. Further, the current collector 32 and the tab portion 34 are not integrally formed, but may be formed as separate members and connected in a subsequent process. In this case, the tab part 34 may be formed from the rolled metal foil, for example, may be formed from the electrolytic metal foil. Moreover, the collector of only one of the negative electrode 30 and the positive electrode 40 may be formed from the rolled metal foil.

１…リチウムイオン二次電池、１０…ケース、２０…電極組立体、３０…負極（電極）、３２…集電体、３２Ａ…長辺、３２Ｂ…短辺、３４…タブ部、３６…負極活物質層、４０…正極（電極）、４４…タブ部、４６…正極活物質層、５０…セパレータ、６０…導電部材、６２…負極端子、６４Ａ，６４Ｂ…絶縁部材、６６…正極端子、７０…結晶粒、Ｄ…鉛直方向、Ｒ…圧延方向。 DESCRIPTION OF SYMBOLS 1 ... Lithium ion secondary battery, 10 ... Case, 20 ... Electrode assembly, 30 ... Negative electrode (electrode), 32 ... Current collector, 32A ... Long side, 32B ... Short side, 34 ... Tab part, 36 ... Negative electrode active Material layer 40 ... Positive electrode (electrode) 44 ... Tab portion 46 ... Positive electrode active material layer 50 ... Separator 60 ... Conductive member 62 ... Negative electrode terminal 64A, 64B ... Insulating member 66 ... Positive electrode terminal 70 ... Crystal grain, D: vertical direction, R: rolling direction.

Claims (2)

少なくとも一対の電極を備えるリチウムイオン二次電池であって、
前記電極は、圧延された金属箔から形成された長方形状の集電体と、前記集電体の長辺から突出するタブ部と、を有し、
前記電極は、前記集電体の短辺方向が鉛直方向に沿うように配置されており、
前記金属箔の圧延方向は、前記集電体の短辺方向に沿っている、リチウムイオン二次電池。 A lithium ion secondary battery comprising at least a pair of electrodes,
The electrode has a rectangular current collector formed from a rolled metal foil, and a tab portion protruding from a long side of the current collector,
The electrode is arranged so that the short side direction of the current collector is along the vertical direction,
The lithium ion secondary battery in which the rolling direction of the metal foil is along the short side direction of the current collector. 前記集電体と前記タブ部とは、一体に形成されている、請求項１記載のリチウムイオン二次電池。   The lithium ion secondary battery according to claim 1, wherein the current collector and the tab portion are integrally formed.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018117407A1 (en) * 2016-12-21 2018-06-28 주식회사 엘지화학 Electrode assembly comprising electrode lead coupled to long-side area

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012137917A1 (en) * 2011-04-07 2012-10-11 日産自動車株式会社 Lamination device and lamination method
JP2014107218A (en) * 2012-11-29 2014-06-09 Toyota Industries Corp Power storage device and method of manufacturing electrode assembly
JP2014116080A (en) * 2012-12-06 2014-06-26 Toyota Industries Corp Electricity storage device and method for manufacturing electricity storage device
JP2014220196A (en) * 2013-05-10 2014-11-20 株式会社豊田自動織機 Method and device for manufacturing electrode
WO2014192285A1 (en) * 2013-05-31 2014-12-04 パナソニックＩｐマネジメント株式会社 Thin battery

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012137917A1 (en) * 2011-04-07 2012-10-11 日産自動車株式会社 Lamination device and lamination method
JP2014107218A (en) * 2012-11-29 2014-06-09 Toyota Industries Corp Power storage device and method of manufacturing electrode assembly
JP2014116080A (en) * 2012-12-06 2014-06-26 Toyota Industries Corp Electricity storage device and method for manufacturing electricity storage device
JP2014220196A (en) * 2013-05-10 2014-11-20 株式会社豊田自動織機 Method and device for manufacturing electrode
WO2014192285A1 (en) * 2013-05-31 2014-12-04 パナソニックＩｐマネジメント株式会社 Thin battery

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018117407A1 (en) * 2016-12-21 2018-06-28 주식회사 엘지화학 Electrode assembly comprising electrode lead coupled to long-side area
KR20180072087A (en) * 2016-12-21 2018-06-29 주식회사 엘지화학 Electrode Assembly Comprising Electrode Lead Coupled to Long Side Portion
KR102124640B1 (en) * 2016-12-21 2020-06-18 주식회사 엘지화학 Electrode Assembly Comprising Electrode Lead Coupled to Long Side Portion
US11069943B2 (en) 2016-12-21 2021-07-20 Lg Chem, Ltd. Electrode assembly comprising electrode lead coupled to long-side area

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