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JP4524360B2 - Lithium ion battery - Google Patents
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JP4524360B2 - Lithium ion battery - Google Patents

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Publication number
JP4524360B2
JP4524360B2 JP2001173696A JP2001173696A JP4524360B2 JP 4524360 B2 JP4524360 B2 JP 4524360B2 JP 2001173696 A JP2001173696 A JP 2001173696A JP 2001173696 A JP2001173696 A JP 2001173696A JP 4524360 B2 JP4524360 B2 JP 4524360B2
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Prior art keywords
positive electrode
negative electrode
electrode terminal
terminal
lithium ion
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JP2002367592A (en
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武義 野阪
敏之 温田
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GS Yuasa International Ltd
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GS Yuasa International Ltd
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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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  • Connection Of Batteries Or Terminals (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明はリチウムイオン電池に係り、特に負極端子および正極端子のそれぞれの所定位置が絶縁被膜で被覆されたリチウムイオン電池に関する。
【０００２】
【従来の技術】
近年、電子技術の大きな進歩により、一般ユーザー向けの携帯用電子機器の小型軽量化が進んでおり、この電子機器のエネルギー源として小型軽量化のリチウムイオン電池が多用されている。なかでも、金属樹脂複合フィルムをパッケージに用い、さらに小型軽量化を図ったリチウムイオン電池が一部実用化されている。
【０００３】
金属樹脂複合フィルム製のパッケージは、例えばアルミニウム箔製の金属箔芯材と、金属箔芯材の表面に沿うポリエチレンテレフタレート（PET）等のポリエステル樹脂やナイロン等のポリアミド樹脂、あるいはポリイミド樹脂製の保護層と、金属箔芯材の裏面に沿うポリプロピレン（PP）あるいはポリエチレン（PE）等のポリオレフィン系樹脂製の金属接着性を有する融着性樹脂層とを積層させたもの等が使用される。
【０００４】
金属樹脂複合フィルムをパッケージに用いたリチウムイオン電池を製造する際には、図５に示すように負極60および正極61にそれぞれ負極端子62および正極端子63を接合し、これらの負極60および正極61にセパレータ64を積層させ、例えば図６の矢印に示すように巻回することにより発電要素65を形成する（図７参照）。
この発電要素65をパッケージ66（図８参照）を中央で折曲げて収容封止することにより、図８に示すリチウムイオン電池70を形成する。
【０００５】
パッケージ66は、矩形状に形成された金属樹脂複合フィルムを中央の折曲部の上方に発電要素65の形状に対応した窪み（すなわち収容部67）があらかじめ形成されている。
この収容部67に発電要素65を配置した後、金属樹脂複合フィルムを中央で折り曲げ、中央から上方の金属樹脂複合フィルムと中央から下方の金属樹脂複合フィルムとを重ね合わせて発電要素65を挟み込み、重ね合わせた金属樹脂フィルムの三辺を加熱して融着させることで融着代66Ａ，66Ｂ，66Ｃを形成する。
【０００６】
この際に、融着代66Ｃで負極端子62および正極端子63を挟持することで、図９に示すように負極端子62および正極端子63は折曲げられる。この場合に、正極60および負極61との間に介在させたセパレータ64を負極60の端部60Ａ，正極61の端部61Ａから突出させることで、折曲げられた各端子62，63と負極60，正極61との接触を避けている。
【０００７】
【発明が解決しようとする課題】
しかしながら、発電要素65をパッケージ66により収容封止するときに、負極60，正極61の端部から突出しているセパレータ64が折曲げられて、負極端子62および正極端子63と負極60および正極61とが接触する虞れがある。
【０００８】
この不具合を解消するために、特開2000-138057で負極端子および正極端子にそれぞれ絶縁被膜を被せる技術が開示されている。しかし、絶縁被膜を被せる位置によっては、負極端子および正極端子と正極および負極とが接触する虞れがある。
このため、負極端子や正極端子が正極および負極に接触することを確実に防ぐことができるリチウムイオン電池の実用化が望まれていた。
【０００９】
本発明は、前述した問題点に鑑みてなされたものであり、その目的は、負極端子や正極端子と正極および負極との接触を確実に防ぐことができるリチウムイオン電池を提供することにある。
【００１０】
【課題を解決するための手段】
前述した目的を達成するために、本発明は、請求項１に記載したように、セパレータ，負極および正極を具備する発電要素と、前記負極および前記正極にそれぞれ接合された一対の端子と、前記各端子の開放端部が外部露出するように前記発電要素を収容封止するパッケージと、前記パッケージに設けられた所定幅寸法を有する融着代と、前記各端子の所定位置を被覆するとともに前記融着代に挟持される絶縁被膜とを備えたリチウムイオン電池であって、前記発電要素が前記負極および前記正極間に介設されたセパレータを有し、かつ、前記セパレータが前記発電要素の端子側の端部において前記負極および前記正極よりも突設され、前記絶縁被膜の端部が前記セパレータの突設端部と前記正極および前記負極の端子側の端部との間の位置に配置されていることを特徴としている。
【００１１】
このように構成されたリチウムイオン電池においては、負極端子および正極端子のそれぞれの所定位置を絶縁被膜で被覆するとともに、これらの絶縁被膜の端部をセパレータの突設端部と前記正極および前記負極の端子側の端部との間の位置に配置した。よって、負極端子や正極端子と負極・正極との間に絶縁被膜を介在させることができる。また、絶縁被膜の端部をセパレータ間に介在させて、セパレータから突出した負極端子および正極端子をそれぞれ絶縁被膜で確実に被覆できる。
【００１２】
また、本発明においては、請求項２に記載したように、前記発電要素が略楕円状に巻回されていることを特徴としている。
【００１４】
【発明の実施の形態】
以下、本発明に係る実施形態を図面に基づいて詳細に説明する。なお、以下に説明する各実施形態において、図１において説明した部材等については、図中に同一符号あるいは相当符号を付すことにより説明を簡略化あるいは省略する。
【００１５】
図１に示すように、本発明に係るリチウムイオン電池10は、負極11および正極12を具備する発電要素14と、負極11および正極12にそれぞれ接合された負極端子15および正極端子16と、負極端子15の開放端部15Ａおよび正極端子16の開放端部16Ａが外部露出するように発電要素14を収容封止するパッケージ20と、発電要素14を囲むようにパッケージ20の周縁に設けられた所定幅寸法を有する融着代21Ａ，21Ｂ，21Ｃと、負極端子15および正極端子16の所定位置15Ｂ，16Ｂを被覆するとともに融着代21Ｃに挟持される負極端子用の絶縁被膜25および正極端子用の絶縁被膜26とを備える。
【００１６】
発電要素14は、負極11および正極12間に介設されたセパレータ13を有するとともに略楕円状に巻回され、かつ、セパレータ13が発電要素14の軸方向両端部14Ａにおいて負極11および正極12よりも突設されている。
【００１７】
（参考例）図２に示すように、参考例のリチウムイオン電池では、負極端子15に被覆された絶縁被膜25は、その端部25Ａが負極11に到達する位置に配置され、かつ、正極端子16に被覆された絶縁被膜26は、その端部26Ａが正極12に到達する位置に配置されている。よって、負極端子15や正極端子16と負極11，正極12との間に絶縁被膜25，26を介在させることができる。従って、負極端子15や正極端子16と負極11，正極12との接触を確実に防ぐことができる。
【００１８】
（実施例）次に、第１実施形態および第２実施形態について図３および図４に基づいて説明する。図３に示すように、本発明に係る第１実施形態であるリチウムイオン電池30は、負極端子15および正極端子16がそれぞれ絶縁被膜25，26で被覆され、各絶縁被膜25，26の端部25Ａ，26Ａがセパレータ13の突設端部と前記正極12および前記負極11の端子側の端部との間の位置に配置されている点で参考例のリチウムイオン電池と異なる。
【００１９】
このため、各絶縁被膜25，26の端部25Ａ，26Ａをセパレータ13間に介在させて、セパレータ13から突出した負極端子15および正極端子16をそれぞれ絶縁被膜25，26で確実に被覆できる。
従って、負極端子15や正極端子16と負極11・正極12との接触を確実に防ぐことができる。
【００２０】
図４に示すように、本発明に係る第２実施形態であるリチウムイオン電池40は、発電要素14の最外層の負極11および正極12（図２参照）にそれぞれ負極端子15および正極端子16が接合され、各端子がそれぞれ絶縁被膜25，26で被覆され、各絶縁被膜25，26の端部25Ａ，26Ａがセパレータ13の突設端部と前記正極12および前記負極11の端子側の端部との間の位置に配置されている。第２実施形態においても、第１実施形態と同様に、負極端子15や正極端子16と負極11および正極12との接触を確実に防ぐことができる。
【００２１】
なお、前述した第１実施形態および第２実施形態では、発電要素の負極および正極にそれぞれ負極端子および正極端子を接合し、これらの負極および正極の間にセパレータを介在させて巻回した例について説明したが、例えば固体電解質リチウムイオン二次電池では、負極と正極との間に固体電解質層が形成されていることからこれらの間の短絡の可能性は少なく、負極と正極との間にセパレータを設けない構成としてもよい。
【００２２】
さらに、本発明は、前述した各実施形態に限定されるものでなく、適宜な変形，改良等が可能であり、前述した各実施形態において例示した発電要素，正極端子、負極端子，絶縁被膜，パッケージ等の材質，形状，寸法，形態，数，配置個所，厚さ寸法等は本発明を達成できるものであれば任意であり、限定されない。
【００２３】
【発明の効果】
以上、説明したように、本発明によれば、請求項１に記載したように、負極端子および正極端子のそれぞれの所定位置を絶縁被膜で被覆するとともに、これらの絶縁被膜の端部を前記セパレータの突設端部と正極および負極の端子側の端部との間の位置に配置した。このため、負極端子や正極端子と負極，正極との間に絶縁被膜を介在させることができる。また、絶縁被膜の端部をセパレータ間に介在させて、セパレータから突出した負極端子および正極端子をそれぞれ絶縁被膜で確実に被覆できる。従って、負極端子や正極端子と負極，正極との接触を確実に防ぐことができる。
【図面の簡単な説明】
【図１】本発明に係るリチウムイオン電池の実施形態を示す斜視図である。
【図２】参考例のリチウムイオン電池の断面図である。
【図３】本発明に係る第１実施形態を示す断面図である。
【図４】本発明に係る第２実施形態を示す断面図である。
【図５】従来のリチウムイオン電池を製造する方法を示す第１の説明図である。
【図６】従来のリチウムイオン電池を製造する方法を示す第２の説明図である。
【図７】従来のリチウムイオン電池を製造する方法を示す第３の説明図である。
【図８】従来のリチウムイオン電池を製造する方法を示す第４の説明図である。
【図９】従来のリチウムイオン電池を製造する方法を示す第５の説明図である。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lithium ion battery, and more particularly to a lithium ion battery in which predetermined positions of a negative electrode terminal and a positive electrode terminal are covered with an insulating film.
[0002]
[Prior art]
In recent years, due to great advances in electronic technology, portable electronic devices intended for general users have been reduced in size and weight, and lithium-ion batteries that are reduced in size and weight are frequently used as energy sources for these electronic devices. In particular, some lithium ion batteries that use a metal resin composite film as a package and are further reduced in size and weight have been put into practical use.
[0003]
A package made of a metal resin composite film is, for example, a metal foil core material made of aluminum foil, a polyester resin such as polyethylene terephthalate (PET) along the surface of the metal foil core material, a polyamide resin such as nylon, or a protection made of polyimide resin. A layer obtained by laminating a layer and a fusible resin layer having a metal adhesive property made of polyolefin resin such as polypropylene (PP) or polyethylene (PE) along the back surface of the metal foil core is used.
[0004]
When manufacturing a lithium ion battery using a metal resin composite film as a package, a negative electrode terminal 62 and a positive electrode terminal 63 are joined to a negative electrode 60 and a positive electrode 61, respectively, as shown in FIG. The power generation element 65 is formed by laminating the separator 64 and winding it as shown by the arrow in FIG. 6 (see FIG. 7).
The power generating element 65 is housed and sealed by folding a package 66 (see FIG. 8) at the center, thereby forming a lithium ion battery 70 shown in FIG.
[0005]
In the package 66, a depression corresponding to the shape of the power generating element 65 (that is, the accommodating portion 67) is formed in advance above the central bent portion of the metal resin composite film formed in a rectangular shape.
After the power generation element 65 is disposed in the housing portion 67, the metal resin composite film is bent at the center, and the power generation element 65 is sandwiched between the metal resin composite film that is upper from the center and the metal resin composite film that is lower from the center, The fusion margins 66A, 66B, 66C are formed by heating and fusing three sides of the overlapped metal resin film.
[0006]
At this time, by sandwiching the negative electrode terminal 62 and the positive electrode terminal 63 with the fusion allowance 66C, the negative electrode terminal 62 and the positive electrode terminal 63 are bent as shown in FIG. In this case, the separator 64 interposed between the positive electrode 60 and the negative electrode 61 protrudes from the end portion 60A of the negative electrode 60 and the end portion 61A of the positive electrode 61, whereby the bent terminals 62 and 63 and the negative electrode 60 are projected. , Avoid contact with the positive electrode 61.
[0007]
[Problems to be solved by the invention]
However, when the power generation element 65 is accommodated and sealed by the package 66, the separator 64 protruding from the ends of the negative electrode 60 and the positive electrode 61 is bent, and the negative electrode terminal 62, the positive electrode terminal 63, the negative electrode 60, and the positive electrode 61 May come into contact.
[0008]
In order to solve this problem, Japanese Patent Laid-Open No. 2000-138057 discloses a technique for covering the negative electrode terminal and the positive electrode terminal with an insulating film. However, there is a possibility that the negative electrode terminal and the positive electrode terminal, and the positive electrode and the negative electrode come into contact with each other depending on the position where the insulating film is applied.
For this reason, the practical use of the lithium ion battery which can prevent reliably a negative electrode terminal and a positive electrode terminal contacting a positive electrode and a negative electrode was desired.
[0009]
The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a lithium ion battery capable of reliably preventing contact between the negative electrode terminal or the positive electrode terminal and the positive electrode and the negative electrode.
[0010]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides a power generation element including a separator, a negative electrode, and a positive electrode, a pair of terminals respectively joined to the negative electrode and the positive electrode, and A package that accommodates and seals the power generation element so that an open end portion of each terminal is exposed to the outside, a fusion allowance having a predetermined width dimension provided in the package, and a predetermined position of each terminal and A lithium-ion battery including an insulating coating sandwiched between fusion margins, wherein the power generation element includes a separator interposed between the negative electrode and the positive electrode, and the separator is a terminal of the power generation element projecting than the negative electrode and the positive electrode at the end on the side, the position between the said end portion of the insulating film is a projecting end portion of the separator positive electrode and the end portion of the negative electrode terminal side of the It is characterized by being arranged.
[0011]
In the lithium ion battery configured as described above, each predetermined position of the negative electrode terminal and the positive electrode terminal is covered with an insulating coating, and the end portions of these insulating coatings are provided as projecting end portions of the separator, the positive electrode, and the negative electrode. It arrange | positioned in the position between the edge parts of the terminal side . Therefore, an insulating film can be interposed between the negative electrode terminal or the positive electrode terminal and the negative electrode / positive electrode. Moreover, the edge part of an insulating film can be interposed between separators, and the negative electrode terminal and positive electrode terminal which protruded from the separator can be reliably coat | covered with an insulating film, respectively.
[0012]
Moreover, in this invention, as described in Claim 2, the said electric power generation element is wound by substantially ellipse shape, It is characterized by the above-mentioned.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. In each embodiment described below, the members and the like described in FIG. 1 are simplified or omitted by giving the same reference numerals or equivalent reference numerals in the drawings.
[0015]
As shown in FIG. 1, engagement Brighter lithium-ion battery 10 to the present invention includes a power generating element 14 having a negative electrode 11 and positive electrode 1 2, a negative electrode 11 and a negative terminal that are respectively joined to the positive electrode 12 15 and the positive electrode terminal 16 A package 20 that houses and seals the power generation element 14 so that the open end 15A of the negative electrode terminal 15 and the open end 16A of the positive electrode terminal 16 are exposed to the outside, and is provided on the periphery of the package 20 so as to surround the power generation element 14 Insulating coatings 25 for the negative electrode terminal covering the predetermined positions 15B and 16B of the fusion margins 21A, 21B and 21C having the predetermined width dimension and the negative electrode terminal 15 and the positive electrode terminal 16 and being sandwiched between the fusion allowances 21C . And an insulating coating 26 for the positive electrode terminal.
[0016]
The power generation element 14 has a separator 13 interposed between the negative electrode 11 and the positive electrode 12 and is wound in an approximately elliptical shape, and the separator 13 is formed from the negative electrode 11 and the positive electrode 12 at both axial end portions 14A of the power generation element 14. Is also protruding.
[0017]
(Reference Example) As shown in FIG. 2, in the lithium ion battery of the reference example, the insulating coating 25 covered with the negative electrode terminal 15 is disposed at a position where the end 25A reaches the negative electrode 11 and the positive electrode terminal. The insulating coating 26 covered with 16 is disposed at a position where the end portion 26 </ b> A reaches the positive electrode 12. Therefore, the insulating coatings 25 and 26 can be interposed between the negative electrode terminal 15 or the positive electrode terminal 16 and the negative electrode 11 or the positive electrode 12. Therefore, contact between the negative electrode terminal 15 or the positive electrode terminal 16 and the negative electrode 11 or the positive electrode 12 can be reliably prevented.
[0018]
(Example) Next, the first and second embodiments will be described with reference to FIGS. As shown in FIG. 3, in the lithium ion battery 30 according to the first embodiment of the present invention, the negative electrode terminal 15 and the positive electrode terminal 16 are coated with insulating coatings 25 and 26, respectively. 25A, 26A is different lithium-ion batteries of reference example in that it is arranged at a position between the end of the terminal side of the the projecting end portion cathode 12 and the anode 11 of the separator 13.
[0019]
Therefore, the end portions 25A and 26A of the insulating coatings 25 and 26 are interposed between the separators 13, so that the negative electrode terminal 15 and the positive electrode terminal 16 protruding from the separator 13 can be reliably covered with the insulating coatings 25 and 26, respectively.
Therefore, contact between the negative electrode terminal 15 and the positive electrode terminal 16 and the negative electrode 11 and the positive electrode 12 can be reliably prevented.
[0020]
As shown in FIG. 4, the lithium ion battery 40 according to the second embodiment of the present invention has a negative electrode terminal 15 and a positive electrode terminal 16 on the negative electrode 11 and the positive electrode 12 (see FIG. 2) of the outermost layer of the power generation element 14, respectively. Each terminal is covered with insulating coatings 25 and 26, and ends 25A and 26A of the insulating coatings 25 and 26 are projecting end portions of the separator 13 and end portions on the terminal side of the positive electrode 12 and the negative electrode 11, respectively. It is arranged at a position between . In the second embodiment, on purpose as in the first embodiment form, it is possible to surely prevent contact between the negative electrode terminal 15 and the positive electrode terminal 16 and the negative electrode 11 and positive electrode 12.
[0021]
In the first embodiment and the second embodiment described above, the negative electrode terminal and the positive electrode terminal are joined to the negative electrode and the positive electrode of the power generation element, respectively, and the separator is interposed between the negative electrode and the positive electrode. As described above, for example, in a solid electrolyte lithium ion secondary battery, since a solid electrolyte layer is formed between the negative electrode and the positive electrode, there is little possibility of a short circuit between them, and a separator is provided between the negative electrode and the positive electrode. It is good also as a structure which does not provide.
[0022]
Furthermore, the present invention is not limited to the above-described embodiments, and appropriate modifications, improvements, and the like are possible. The power generation element, the positive electrode terminal, the negative electrode terminal, the insulating coating, and the like exemplified in the above-described embodiments. The material, shape, dimension, form, number, arrangement location, thickness dimension, etc. of the package and the like are arbitrary and are not limited as long as the present invention can be achieved.
[0023]
【The invention's effect】
As described above, according to the present invention, as described in claim 1, each predetermined position of the negative electrode terminal and the positive electrode terminal is covered with the insulating coating, and the end portions of these insulating coatings are formed on the separator. The projecting end portion and the end portions on the terminal side of the positive electrode and the negative electrode were disposed at positions. For this reason, an insulating film can be interposed between the negative electrode terminal or the positive electrode terminal and the negative electrode or the positive electrode. Moreover, the edge part of an insulating film can be interposed between separators, and the negative electrode terminal and positive electrode terminal which protruded from the separator can be reliably coat | covered with an insulating film, respectively. Accordingly, contact between the negative electrode terminal or the positive electrode terminal and the negative electrode or the positive electrode can be reliably prevented.
[Brief description of the drawings]
It is a perspective view showing a preferred form status of the lithium-ion battery according to the present invention; FIG.
2 is a cross-sectional view of the lithium ion battery of Example.
FIG. 3 is a cross-sectional view showing a first embodiment according to the present invention.
FIG. 4 is a cross-sectional view showing a second embodiment according to the present invention.
FIG. 5 is a first explanatory view showing a method of manufacturing a conventional lithium ion battery.
FIG. 6 is a second explanatory view showing a method of manufacturing a conventional lithium ion battery.
FIG. 7 is a third explanatory view showing a method of manufacturing a conventional lithium ion battery.
FIG. 8 is a fourth explanatory view showing a method of manufacturing a conventional lithium ion battery.
FIG. 9 is a fifth explanatory view showing a method of manufacturing a conventional lithium ion battery.

Claims (2)

セパレータ，負極および正極を具備する発電要素と、前記負極および前記正極にそれぞれ接合された一対の端子と、前記各端子の開放端部が外部露出するように前記発電要素を収容封止するパッケージと、前記パッケージに設けられた所定幅寸法を有する融着代と、前記各端子の所定位置を被覆するとともに前記融着代に挟持される絶縁被膜とを備えたリチウムイオン電池であって、前記発電要素が前記負極および前記正極間に介設されたセパレータを有し、かつ、前記セパレータが前記発電要素の端子側の端部において前記負極および前記正極よりも突設され、前記絶縁被膜の端部が前記セパレータの突設端部と前記正極および前記負極の端子側の端部との間の位置に配置されていることを特徴とするリチウムイオン電池。 A power generation element including a separator, a negative electrode, and a positive electrode; a pair of terminals respectively joined to the negative electrode and the positive electrode; and a package that accommodates and seals the power generation element so that an open end portion of each terminal is exposed to the outside. A lithium ion battery comprising: a fusion allowance having a predetermined width dimension provided in the package; and an insulating coating that covers a predetermined position of each terminal and is sandwiched between the fusion allowances. elements have a separator which is interposed between the negative electrode and the positive electrode and the separator is protruded than the negative electrode and the positive electrode at the end of the terminal side of the power generating element, an end portion of the insulating film There features and to Brighter lithium ion batteries that are disposed at a position between the projecting end portion and the positive electrode and the end portion of the negative electrode terminal side of the separator. 前記発電要素が略楕円状に巻回されていることを特徴とする請求項１に記載したリチウムイオン電池。Lithium ion batteries according to claim 1, wherein the power generating element is wound to form a substantially elliptical.
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