JP2016110948A - Lithium ion secondary battery - Google Patents

Lithium ion secondary battery Download PDF

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JP2016110948A
JP2016110948A JP2014250127A JP2014250127A JP2016110948A JP 2016110948 A JP2016110948 A JP 2016110948A JP 2014250127 A JP2014250127 A JP 2014250127A JP 2014250127 A JP2014250127 A JP 2014250127A JP 2016110948 A JP2016110948 A JP 2016110948A
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tab portion
tab
secondary battery
lithium ion
ion secondary
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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

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Abstract

PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery capable of suppressing a damage of a tab part.SOLUTION: A lithium ion secondary battery 1 comprises: at least a pair of electrodes 30 and 40; and a case 10 that houses the pair of electrodes 30 and 40. The electrode 30 includes: a collector 32; and a tab part 34 that is projected from the collector 32. The tab part 34 is folded in a folding line 36 extended in a direction crossing to a projection direction D1 of the tab part 34, and is connected to an inductive member 60 in a tip side than the folding line 36. The tab part 34 is formed by a rolled metal foil, and the folding line 36 is along with a rolling direction D2 of the metal foil.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、集電体と集電体から突出するタブ部とを有する複数の電極と、複数の電極を収容するケースと、を備えている。電極のタブ部は、ケースの内壁に配置された導電部材に接続されており、この導電部材は、ケースの内部及び外部にわたって延在する電極端子に接続されている。すなわち、電極は、導電部材を介して電極端子に電気的に接続されている。   For example, a lithium ion secondary battery described in Patent Document 1 includes a plurality of electrodes having a current collector and a tab portion protruding from the current collector, and a case that houses the plurality of electrodes. The tab portion of the electrode is connected to a conductive member arranged on the inner wall of the case, and this conductive member is connected to an electrode terminal extending over the inside and the outside of the case. That is, the electrode is electrically connected to the electrode terminal via the conductive member.

特許文献１のリチウムイオン二次電池では、複数の電極のタブ部が互いに重ねられ、且つ折り曲げられている。重ねられ且つ折り曲げられたタブ部の先端部は、導電部材に接続されている。タブ部を折り曲げることにより、タブ部の突出高さが低減され、ケース内に形成されるデッドスペース（充放電に寄与しない空間）が狭められている。   In the lithium ion secondary battery of Patent Document 1, tab portions of a plurality of electrodes are overlapped with each other and bent. The tip portion of the tab portion that is overlapped and bent is connected to the conductive member. By bending the tab portion, the protruding height of the tab portion is reduced, and a dead space (a space that does not contribute to charge / discharge) formed in the case is narrowed.

特開２０１３−１６１７５７号公報JP 2013-161757 A

特許文献１のリチウムイオン二次電池のように、タブ部が重なり合った状態で折り曲げられる場合、重なり合うタブ部の数が多くなるほど、タブ部を折り曲げ難くなる。このため、タブ部の曲げ半径が大きくなり、タブ部の突出高さが大きくなってしまうことがある。また、この場合、折り曲げ後においてタブ部にスプリングバックが生じることによっても、タブ部の曲げ半径が大きくなり、タブ部の突出高さが大きくなってしまうことがある。結果として、ケース内のデッドスペースが広がってしまう。   As in the lithium ion secondary battery of Patent Document 1, when the tab portions are folded in an overlapping state, the tab portions are more difficult to bend as the number of overlapping tab portions increases. For this reason, the bending radius of a tab part may become large and the protrusion height of a tab part may become large. Further, in this case, even when springback occurs in the tab portion after bending, the bending radius of the tab portion may increase and the protruding height of the tab portion may increase. As a result, the dead space in the case is widened.

本発明は、上記事情に鑑みてなされたものであり、タブ部の突出高さを低減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 reduce the protrusion height of a tab part.

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と、一対の電極を収容するケースと、を備えるリチウムイオン二次電池であって、電極は、集電体と、集電体から突出するタブ部と、を有し、タブ部は、タブ部の突出方向と直交する方向に延びる折り曲げ線で折り曲げられており、折り曲げ線よりも先端側において、ケースの内壁に配置された導電部材に接続されており、タブ部は、圧延された金属箔から形成され、折り曲げ線は、金属箔の圧延方向に沿っている。   A lithium ion secondary battery according to an aspect of the present invention is a lithium ion secondary battery including at least a pair of electrodes and a case that accommodates the pair of electrodes. The electrodes include a current collector and a current collector. A tab portion that protrudes from the body, and the tab portion is bent at a folding line extending in a direction perpendicular to the protruding direction of the tab portion, and is disposed on the inner wall of the case on the tip side of the folding line. It is connected to the conductive member, the tab portion is formed from a rolled metal foil, and the fold line is along the rolling direction of the metal foil.

圧延された金属箔は、圧延方向と直交する折り曲げ線で折り曲げられる場合と比較して、圧延方向に沿う折り曲げ線で折り曲げられる場合の方が、折り曲げ易く、且つ折り曲げ後のスプリング量が小さい。この点、本発明の一側面に係るリチウムイオン二次電池では、タブ部の折り曲げ線が金属箔の圧延方向に沿っているので、タブ部を折り曲げ易く、且つ折り曲げ後にタブ部に生じるスプリングバック量が小さい。したがって、タブ部の曲げ半径を低減でき、タブ部の突出高さを低減できる。   Compared with the case where the rolled metal foil is folded along a folding line perpendicular to the rolling direction, it is easier to bend and the amount of spring after folding is smaller when the metal foil is folded along a folding line along the rolling direction. In this respect, in the lithium ion secondary battery according to one aspect of the present invention, since the fold line of the tab portion is along the rolling direction of the metal foil, the tab portion can be easily bent and the amount of springback generated in the tab portion after bending. Is small. Therefore, the bending radius of the tab portion can be reduced, and the protruding height of the tab portion can be reduced.

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てよい。この場合、部品点数を減らすことができると共に、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, the current collector and the tab portion may be 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.

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、複数の電極を備え、複数の電極のそれぞれが有するタブ部が、互いに重なった状態で折り曲げられていてもよい。このリチウムイオン二次電池では、タブ部を折り曲げ易く、且つ折り曲げ後にタブ部に生じるスプリングバック量が小さいので、タブ部が互いに重なった状態で折り曲げられている場合であっても、各タブ部の曲げ半径を低減でき、タブ部の突出高さを低減できる。   In the lithium ion secondary battery according to one aspect of the present invention, a plurality of electrodes may be provided, and tab portions of each of the plurality of electrodes may be bent so as to overlap each other. In this lithium ion secondary battery, since the tab portion is easy to bend and the amount of springback generated in the tab portion after bending is small, even if the tab portions are folded in a state where they overlap each other, The bending radius can be reduced, and the protruding height of the tab portion can be reduced.

本発明によれば、タブ部の突出高さを低減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 reduce the protrusion height of a tab part 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分解斜視図である。FIG. 1 is an exploded perspective view of a lithium ion secondary battery according to an embodiment of the present invention. 図２中の（ａ）（図２（ａ））は、図１のＩＩ−ＩＩ線における模式的断面図であり、図２中の（ｂ）（図２（ｂ））は、図２（ａ）中のタブ部の一部及び集電体の模式的正面図である。2 (a) (FIG. 2 (a)) is a schematic cross-sectional view taken along the line II-II in FIG. 1, and FIG. 2 (b) (FIG. 2 (b)) is illustrated in FIG. It is a typical front view of a part of tab part in a), and a collector. 図３中の（ａ）（図３（ａ））は、タブ部の模式的斜視図であり、図３中の（ｂ）（図３（ｂ））は、図３（ａ）のＢ部の拡大図であり、図３中の（ｃ）（図３（ｃ））は、折り曲げ前のタブ部の模式的斜視図である。3A (FIG. 3A) is a schematic perspective view of the tab portion, and FIG. 3B (FIG. 3B) is a portion B of FIG. 3A. (C) in FIG. 3 (FIG. 3C) is a schematic perspective view of the tab portion before bending.

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、一方側において開口した本体部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 FIG. 1, 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 is open on one side 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。図２（ａ）に示すように、電極組立体２０は、複数の負極３０及び複数の正極４０と、一対の負極３０及び正極４０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、交互に積層されている（重ねられている）。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. As shown in FIG. 2A, the electrode assembly 20 includes a plurality of negative electrodes 30 and a plurality of positive electrodes 40, and a separator 50 disposed between the pair of negative electrodes 30 and the positive electrodes 40. The negative electrode 30 and the positive electrode 40 are alternately stacked (stacked) 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２（ａ）及び図２（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。負極３０は、集電体３２の両面を覆う負極活物質層３５を有している。ただし、負極活物質層３５は、集電体３２の片面のみを覆っていてもよい。負極活物質層３５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３５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。   As shown in FIGS. 2A and 2B, the negative electrode 30 includes a rectangular current collector 32 and a tab portion 34. The negative electrode 30 has a negative electrode active material layer 35 that covers both surfaces of the current collector 32. However, the negative electrode active material layer 35 may cover only one surface of the current collector 32. The negative electrode active material layer 35 is made of, for example, a carbon-based material such as graphite or hard carbon, an element alloying with lithium (Sn or Si), an element compound having an element alloying with lithium, or a high content of polyacetylene or polypyrrole. Formed from molecular material. The negative electrode active material layer 35 is formed by applying an active material paste to the current collector 32 and drying it.

図２（ｂ）に示すように、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（短辺が延びる方向）に沿って突出している。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。以下では、タブ部３４が集電体３２から突出する方向を、突出方向Ｄ１と記す。   As shown in FIG. 2B, the tab portion 34 has, for example, a rectangular shape (rectangular shape). The tab portion 34 protrudes from the long side 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 extends). Moreover, the tab part 34 protrudes along the short side direction (direction in which a short side extends) of the current collector 32. 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. Hereinafter, a direction in which the tab portion 34 protrudes from the current collector 32 is referred to as a protruding direction D1.

タブ部３４は、突出方向Ｄと直交する折り曲げ線３６に沿って折り曲げられており、折曲部３７が形成されている。折り曲げられたタブ部３４の先端部３８は、突出方向Ｄ１に対して略直角である。ここで、先端部３８とは、タブ部３４において折り曲げ線３６又は折曲部３７よりも先端側に位置する部分と言い換えられる。   The tab portion 34 is bent along a bending line 36 orthogonal to the protruding direction D, and a bent portion 37 is formed. The tip portion 38 of the bent tab portion 34 is substantially perpendicular to the protruding direction D1. Here, the distal end portion 38 is referred to as a portion of the tab portion 34 that is located on the distal end side with respect to the fold line 36 or the bent portion 37.

複数の負極３０のそれぞれが有するタブ部３４は、互いに重なった状態で折り曲げられている。本実施形態では、５つの負極３０のタブ部３４が、互いに重ねられ、且つ折り曲げられている。   The tab part 34 which each of the some negative electrode 30 has is bend | folded in the state which mutually overlapped. In the present embodiment, the tab portions 34 of the five negative electrodes 30 are overlapped with each other and bent.

重ねられた５つのタブ部３４の先端部３８は、ケース１０内に配置された導電部材６０に電気的に接続されている。本実施形態では、タブ部３４と導電部材６０とは、溶接部分８０において溶接によって接続されている。導電部材６０は、蓋部１４の内面（ケース１０の内壁）に沿うように配置されており、負極端子６２に電気的に接続されている。負極端子６２は、ケース１０の蓋部１４を貫通し、ケース１０の内部及び外部にわたって延在している。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、環状の絶縁部材６４によって絶縁されている。   The front end portions 38 of the five tab portions 34 that are stacked are electrically connected to a conductive member 60 disposed in the case 10. In the present embodiment, the tab portion 34 and the conductive member 60 are connected at the welded portion 80 by welding. The conductive member 60 is disposed along the inner surface of the lid portion 14 (inner wall of the case 10), and is electrically connected to the negative electrode terminal 62. The negative electrode terminal 62 penetrates the lid portion 14 of the case 10 and extends over the inside and the outside 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 annular insulating member 64.

以上のように、タブ部３４は、突出方向Ｄ１に対して略直角な方向に折り曲げられ、折り曲げられたタブ部３４の先端部３８が導電部材６０に接続されている。このようにタブ部３４を折り曲げることにより、タブ部３４の突出高さＨが低減され、ケース１０内に形成されるデッドスペースが狭まる。   As described above, the tab portion 34 is bent in a direction substantially perpendicular to the protruding direction D <b> 1, and the distal end portion 38 of the bent tab portion 34 is connected to the conductive member 60. By bending the tab portion 34 in this way, the protruding height H of the tab portion 34 is reduced, and the dead space formed in the case 10 is narrowed.

集電体３２及びタブ部３４は、圧延された金属箔（例えば、銅箔）から形成されている。本実施形態では、集電体３２とタブ部３４とは、一体に形成されている。つまり、集電体３２及びタブ部３４は、圧延された一枚の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。ここで、図３（ａ）〜図３（ｃ）に示すように、タブ部３４において、折り曲げ線３６は、タブ部３４を構成する金属箔の圧延方向Ｄ２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。折り曲げ線３６と金属箔の圧延方向Ｄ２とは、この例のように、例えば平行であってもよい。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。   The current collector 32 and the tab portion 34 are formed from a rolled metal foil (for example, copper foil). In the present embodiment, the current collector 32 and the tab portion 34 are integrally formed. That is, the current collector 32 and the tab portion 34 are formed by being collectively cut out from one rolled metal foil. Here, as shown in FIGS. 3A to 3C, in the tab portion 34, the fold line 36 is along the rolling direction D <b> 2 of the metal foil constituting the tab portion 34. 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 fold line 36 and the rolling direction D2 of the metal foil may be parallel, for example, as in this example. 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（ｂ）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Ｄ２に沿って延ばされている。これにより、例えば、圧延方向Ｄ２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Ｄ２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Ｄ２は、結晶粒７０の配向方向と言い換えてもよい。なお、タブ部３４の先端部３８（Ｃ１）においても、結晶粒７０の配向方向は、金属箔の圧延方向Ｄ２に沿っている。また、タブ部３４において折り曲げ線３６と重なる部分（折曲部３７となる部分、Ｃ２）においても、結晶粒７０の配向方向は、金属箔の圧延方向Ｄ２に沿っている。   As shown in FIG.3 (b), in the rolled metal foil, the crystal grain 70 which comprises metal foil is extended along the rolling direction D2. Thereby, for example, the crystal grain size in the rolling direction D2 (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 D2 (the maximum grain size in the direction perpendicular to the rolling direction). Is longer than (length). The rolling direction D2 of the metal foil may be rephrased as the orientation direction of the crystal grains 70. In addition, also in the front-end | tip part 38 (C1) of the tab part 34, the orientation direction of the crystal grain 70 is along the rolling direction D2 of metal foil. Also, in the portion of the tab portion 34 that overlaps the fold line 36 (the portion that becomes the bent portion 37, C2), the orientation direction of the crystal grains 70 is along the rolling direction D2 of the metal foil.

圧延された金属箔は、このように結晶粒７０が圧延方向Ｄ２に沿って延びた形状を有している。つまり、金属箔を構成する結晶粒７０の粒界が、圧延方向Ｄ２及び折り曲げ線３６に沿っている。このような理由のため、圧延方向Ｄ２と直交する折り曲げ線で折り曲げられる場合よりも、圧延方向Ｄ２に沿う折り曲げ線で折り曲げられる場合の方が、曲がり易く、且つ折り曲げ後のスプリングバック量が小さい。この点、本実施形態では、タブ部３４の折り曲げ線３が金属箔の圧延方向Ｄ２に沿っているので、タブ部３４を折り曲げ易く、且つ折り曲げ後にタブ部３４の折曲部３７に生じるスプリングバック量が小さい。したがって、重ねられた複数のタブ部３４其々の折曲部３７の曲げ半径を低減でき、タブ部３４の突出高さＨを低減できる。   The rolled metal foil thus has a shape in which the crystal grains 70 extend along the rolling direction D2. That is, the grain boundaries of the crystal grains 70 constituting the metal foil are along the rolling direction D2 and the fold line 36. For this reason, it is easier to bend and the amount of springback after the folding is smaller when folded along the folding line along the rolling direction D2 than when folding along the folding line perpendicular to the rolling direction D2. In this respect, in the present embodiment, since the fold line 3 of the tab portion 34 is along the rolling direction D2 of the metal foil, the tab portion 34 can be easily bent, and the spring back generated in the bent portion 37 of the tab portion 34 after bending. The amount is small. Therefore, it is possible to reduce the bending radius of the bent portion 37 of each of the plurality of tab portions 34 overlapped, and to reduce the protruding height H of the tab portion 34.

本実施形態では、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、本実施形態では、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、部品点数を減らすことができる。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 present embodiment, the current collector 32 and the tab portion 34 are integrally formed. For this reason, in this embodiment, the current collector 32 and the tab portion 34 are prepared as separate members, and the number of parts can be reduced as compared with the case where they are connected by a subsequent process such as joining. Further, the step of connecting the current collector 32 and the tab portion 34 can be omitted.

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。   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４２と、タブ部と、を有している。正極４０の集電体４２及びタブ部は、圧延された金属箔（例えば、アルミニウム箔）から形成されている。正極４０では、タブ部は、集電体４２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。正極４０は、集電体４２の両面を覆う正極活物質層４５を有している。ただし、正極活物質層４５は、集電体４２の片面のみを覆っていてもよい。正極活物質層４５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 has a rectangular current collector 42 and a tab portion. The current collector 42 and the tab portion of the positive electrode 40 are formed from a rolled metal foil (for example, an aluminum foil). In the positive electrode 40, the tab portion protrudes from the other side (the side opposite to the side where the tab portion 34 of the negative electrode 30 protrudes) in the long side direction of the current collector 42. The positive electrode 40 is electrically connected to the positive electrode terminal 66 through the conductive member 60. The positive electrode 40 has a positive electrode active material layer 45 that covers both surfaces of the current collector 42. However, the positive electrode active material layer 45 may cover only one surface of the current collector 42. The positive electrode active material layer 45 is formed of, for example, a composite oxide containing lithium and a transition metal (such as an oxide containing Li, Ni, Co, and Mn).

負極３０のタブ部３４の場合と同様の理由により、負極３０のタブ部３４の場合と同様の作用効果が正極４０のタブ部においても奏される。   For the same reason as in the case of the tab portion 34 of the negative electrode 30, the same effect as that in the case of the tab portion 34 of the negative electrode 30 is exhibited in the tab portion of the positive electrode 40.

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、タブ部の折り曲げ線が金属箔の圧延方向に沿っていたが、負極３０及び正極４０の一方の電極のタブ部の折り曲げ線のみが金属箔の圧延方向に沿っていてもよい。片方の電極のタブ部は、電解金属箔から形成されてもよい。また、集電体とタブ部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、タブ部のみが圧延された金属箔から形成されていればよく、集電体は、電解金属箔から形成されていてよい。   For example, in the above embodiment, the fold line of the tab portion is along the rolling direction of the metal foil in both the negative electrode 30 and the positive electrode 40, but only the fold line of the tab portion of one electrode of the negative electrode 30 and the positive electrode 40 is present. You may be along the rolling direction of metal foil. The tab portion of one electrode may be formed from an electrolytic metal foil. Further, the current collector and the tab portion are not formed integrally, but may be formed as separate members and connected in a subsequent process. In this case, only the tab portion needs to be formed from a rolled metal foil, and the current collector may be formed from an electrolytic 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、３４…タブ部、３５…負極活物質層、３６…折り曲げ線、３７…折曲部、３８…先端部、４０…正極（電極）、４２…集電体、４５…正極活物質層、５０…セパレータ、６０…導電部材、６２…負極端子、６４…絶縁部材、６６…正極端子、７０…結晶粒、８０…溶接部分、Ｄ１…突出方向、Ｄ２…圧延方向。 DESCRIPTION OF SYMBOLS 1 ... Lithium ion secondary battery, 10 ... Case, 20 ... Electrode assembly, 30 ... Negative electrode (electrode), 32 ... Current collector, 34 ... Tab part, 35 ... Negative electrode active material layer, 36 ... Bending line, 37 ... Bending part, 38 ... tip part, 40 ... positive electrode (electrode), 42 ... current collector, 45 ... positive electrode active material layer, 50 ... separator, 60 ... conductive member, 62 ... negative electrode terminal, 64 ... insulating member, 66 ... Positive terminal 70, crystal grains, 80, welded portion, D1, projecting direction, D2, rolling direction.

Claims (3)

少なくとも一対の電極と、前記一対の電極を収容するケースと、を備えるリチウムイオン二次電池であって、
前記電極は、集電体と、前記集電体から突出するタブ部と、を有し、
前記タブ部は、前記タブ部の突出方向と直交する方向に延びる折り曲げ線で折り曲げられており、前記折り曲げ線よりも先端側において、前記ケースの内壁に配置された導電部材に接続されており、
前記タブ部は、圧延された金属箔から形成され、前記折り曲げ線は、前記金属箔の圧延方向に沿っている、リチウムイオン二次電池。 A lithium ion secondary battery comprising at least a pair of electrodes and a case for accommodating the pair of electrodes,
The electrode has a current collector and a tab portion protruding from the current collector,
The tab portion is bent by a fold line extending in a direction perpendicular to the protruding direction of the tab portion, and is connected to a conductive member disposed on the inner wall of the case on the tip side of the fold line,
The said tab part is a lithium ion secondary battery formed from the rolled metal foil, and the said bending line is along the rolling direction of the said metal foil. 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. 複数の前記電極を備え、
前記複数の電極のそれぞれが有する前記タブ部が、互いに重なった状態で折り曲げられている、請求項１又は２記載のリチウムイオン二次電池。 Comprising a plurality of said electrodes;
3. The lithium ion secondary battery according to claim 1, wherein the tab portions of each of the plurality of electrodes are bent in a state of overlapping each other.
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