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JP4984202B2 - Secondary battery and portable device equipped with the same - Google Patents

Secondary battery and portable device equipped with the same Download PDF

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Publication number
JP4984202B2
JP4984202B2 JP2001146942A JP2001146942A JP4984202B2 JP 4984202 B2 JP4984202 B2 JP 4984202B2 JP 2001146942 A JP2001146942 A JP 2001146942A JP 2001146942 A JP2001146942 A JP 2001146942A JP 4984202 B2 JP4984202 B2 JP 4984202B2
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Japan
Prior art keywords
current collector
negative electrode
positive electrode
secondary battery
electrode body
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Expired - Fee Related
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JP2001146942A
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JP2002343439A (en
Inventor
洋 金田
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NEC Corp
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NEC 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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  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、二次電池及びそれを搭載する携帯機器に関し、特に、積層タイプのラミネートフィルム二次電池及びそれを搭載する個人向け携帯型情報通信機器（Personal Digital Assistant：ＰＤＡ）、携帯電話機、ノート型のパーソナルコンピュータなどの携帯機器に関する。
【０００２】
【従来の技術】
従来、セパレータを介して交互に正極体と負極体とを積層した発電体をラミネートフィルムで覆った二次電池がある。
【０００３】
（従来技術１）
図６は、従来の二次電池の分解斜視図である。図７は、従来の二次電池の断面図である。なお、図６には説明の都合上ラミネートフィルムを図示していない。
【０００４】
図６等には、たとえば６枚のセパレータ３と、各セパレータ３の間に交互に位置する３枚の負極体１及び２枚の正極体２と、各負極体１及び各正極体２の一端に露出した電極集電部１ａ，２ａと、電極集電部１ａ，２ａと溶接などによって接続された負極リードタブ４及び正極リードタブ５とを示している。
【０００５】
負極体１及び正極体２は、それぞれ金属箔に活物質が塗布されたものである。そして、これらと重ならないよう負極リードタブ４及び正極リードタブ５が接続されている。ラミネートフィルム６内には非水系電解液が注入されている。
【０００６】
このような二次電池の発電体（セパレータ３、負極体１及び正極体２）部分は、ラミネートフィルム６でのみ覆われているだけであるので、衝撃や圧壊などの外力に弱かった。
【０００７】
（従来技術２）
従来技術１に対し、たとえば特開昭６０−６５４４２号公報、特開昭６０−１１７５４２号公報には、発電体を覆うラミネートフィルムを、紫外線硬化型樹脂で覆う二次電池が記載されている。
【０００８】
【発明が解決しようとする課題】
しかし、従来技術２は、紫外線硬化型樹脂を備えるので、その分、二次電池が重くなるし、またその分、二次電池が厚くなる。これにより、二次電池が搭載される電気機器の軽量化、小型化を図るのが困難になる。そのため、ＰＤＡなどの携帯機器への搭載は不向きである。
【０００９】
さらに、従来技術２は、紫外線硬化型樹脂をラミネートフィルムに塗布する工程と、塗布した紫外線硬化型樹脂を硬化させる工程とが必須となり、従来技術１に比して、製造工程が面倒になる。
【００１０】
そこで、本発明は、面倒な製造工程や、製造工程の増加に伴う製造コストの増加を伴うことなく、強度がある二次電池の軽量化、小型化を図ることを課題とする。
【００１１】
上述の課題を解決するために、本発明は、絶縁性を有するセパレータを介して交互に正極体と負極体とが積層された発電体をラミネートフィルムで覆った二次電池において、前記発電体の交互に積層された正極体と負極体から互いに反対方向に正極体の電極集電部と負極体の電極集電部とが引き出され、前記正極体の電極集電部が前記正極体から引き出された方向の反対側で正極リードタブに接続され、前記負極体の電極集電部が前記負極体から引き出された方向の反対側で負極リードタブに接続され、前記正極体の電極集電部と前記負極体の電極集電部とを、前記発電体の上面側と下面側から包み込むように引き回すことによって、前記正極体の電極集電部と前記負極体の電極集電部とが前記発電体を前記上面側と下面側の両側から挟み込んでいることを特徴とする。
また、本発明は、絶縁性を有するセパレータを介して交互に正極体と負極体とが積層された発電体をラミネートフィルムで覆った二次電池において、前記発電体の一端側では前記正極体の電極集電部として前記発電体から外側に露出し、前記正極体の電極集電部とは反対側の前記発電体の他端側では前記負極体の電極集電部として前記発電体の外側に露出し、前記正極体の電極集電部には正極リードタブが、前記負極体の電極集電部には負極リードタブがそれぞれ接続され、前記正極リードタブは前記正極体の電極集電部から前記負極体の電極集電部に向けて、前記負極リードタブは前記負極体の電極集電部から前記正極体の電極集電部に向けて互いに反対方向に引き出され、前記正極リードタブと負極リードタブとを、前記発電体の上面側と下面側から包み込むように引き回すことによって、前記正極リードタブと負極リードタブとが前記発電体を前記上面側と下面側の両側から挟み込んでいることを特徴とする。
【００１２】
また、本発明の携帯機器は、上記二次電池を搭載することを特徴とする。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態について図面を参照して説明する。
【００１４】
（実施形態１）
［構成の説明］
図１は、本発明の実施形態１の二次電池の斜視図である。図２は、図１の二次電池の分解断面図である。図３は、図１の二次電池の断面図である。なお、図２ではラミネートフィルム３の図示を省略している。
【００１５】
図１等には、たとえば６枚のセパレータ３と、各セパレータ３の間に交互に位置する３枚の負極体１及び２枚の正極体２と、各負極体１及び各正極体２の一端に露出した電極集電部１ａ，２ａと、電極集電部１ａ，２ａと溶接などによって接続された負極リードタブ４及び正極リードタブ５と、電極集電部１ａと正極リードタブ５との接続部及び電極集電部２ａと負極リードタブ４との接続部に設けられた絶縁シート７とを示している。
【００１６】
負極体１は、リチウムイオンなどを収集・放出するカーボンを含むハードカーボン系などの負極活物資を銅箔シートに塗布したものである。負極活物資の厚さは５０μｍ程度、銅箔シートの厚さは１５μｍ程度としている。また、負極体１の寸法は、７０ｍｍ×１２５ｍｍとしている。
【００１７】
正極体２は、リチウムイオンなどを収集・放出するリチウムマンガン複合酸化物を含むリチウムイオン含有金属酸化物などの正極活物質をアルミニウム箔シートに塗布したものである。正極活物資の厚さは７０μｍ程度、アルミニウム箔シートの厚さは２０μｍ程度としている。正極体２の寸法は６５ｍｍ×１２０ｍｍとしている。
【００１８】
セパレータ３は、多孔性で絶縁性を有する２５μｍ程度の厚さのシート状の樹脂である。ここでは、ポリエチレンフィルムとポリプロピレンフィルムの積層型のセパレータを用いている。セパレータ３の寸法は、７５ｍｍ×１３０ｍｍとしている。
【００１９】
負極体１、正極体２及びセパレータ３を有する発電体内部には、非水系電解液を注入した状態でラミネートフィルム６によって封止している。ここでは、非水系電解液は、プロピレンカーボネートとメチルエチルカーボネートとの非水系溶媒に六フッ化リン酸リチウムを溶解させたものを用いている。
【００２０】
負極リードタブ４は、１００μｍ程度の厚さのニッケルなどからなる。正極リードタブ５は、１００μｍ程度の厚さのアルミニウムなどからなる。負極リードタブ４及び正極リードタブ５の寸法は、それぞれ１６０ｍｍ×６５ｍｍとしている。
【００２１】
ラミネートフィルム６は、１００μｍ程度の厚さのアルムニウム箔などからなる。
【００２２】
図１等に示す二次電池の強度試験を行った。強度試験は、先端に半径０．５ｍｍの鉄球を有する加圧棒を、図１等に示す二次電池の最も広い面の重心位置に荷重１０ｋｇｆ〜５０ｋｇｆの範囲で押しあてた時の、電池の短絡可否を調査するものである。なお、比較のため、従来技術１の二次電池の強度試験も行った。
【００２３】
荷重１０ｋｇｆを加えた場合には、双方の二次電池は圧痕ができるものの短絡しなかった。但し、本実施形態の積層型ラミネートフィルム二次電池の圧痕に比して、従来技術１の二次電池の圧痕は大きなものであった。
【００２４】
荷重２０ｋｇｆを加えた場合には、本実施形態の積層型ラミネートフィルム二次電池は短絡しなかった。これに対して、従来技術１の二次電池はおよそ７割がラミネートフィルムに亀裂が生じ短絡した。但し、従来技術１の二次電池で短絡しないものであっても、本実施形態の積層型ラミネートフィルム二次電池の圧痕に比して、大きな圧痕が形成されていた。
【００２５】
荷重３０ｋｇｆを加えた場合には、本実施形態の積層型ラミネートフィルム二次電池は短絡しなかった。これに対して、従来技術１の二次電池は全てがラミネートフィルムに亀裂が生じ短絡した。
【００２６】
荷重４０ｋｇｆ，５０ｋｇｆを加えても本実施形態の積層型ラミネートフィルムに次電池は短絡しなかった。このことから、本実施形態の二次電池は従来技術１の二次電池よりも２倍以上の局所的な衝撃に対する耐力を有していることがわかった。
【００２８】
また、負極リードタブ４と正極リードタブ５とが対極するような構成の二次電池に限らず、負極リードタブ４と正極リードタブ５との幅をそれぞれ半分以下にして、これらを同じ側にした構成の二次電池においても適用が可能である。
【００２９】
（実施形態２）
図４は、本発明の実施形態２の二次電池の断面図である。図５は、図４に示す二次電池の製造概略図である。なお、図４，図５において図１等と同様の部分には、同一符号を付している。
【００３０】
本実施形態の二次電池は、電極集電部１ａ，２ａを長くして、これらをそれぞれセパレータ６の下側で発電体の周囲を引き回しており、電極集電部１ａ，２ａによって発電体を保護するようにしている。
【００３１】
本実施形態に示すような構成の二次電池は、正電極２及び負電極１の数、すなわち電極集電部１ａ、２ａの数が多くなるほど、発電体をより保護することができるようになる。なお、実際には最外層にのみ活物質を片面のみに塗布した電極体を用いている。
【００３２】
以上説明したように、本発明の各実施形態の積層タイプのラミネートフィルム二次電池は、小型で軽く、また強度もあるので、これを個人向け携帯型情報通信機器、携帯電話機、ノート型のパーソナルコンピュータなどの携帯機器への搭載すると、携帯機器の携帯性が向上する。
【００３３】
【発明の効果】
以上説明したように、本発明によると、リードタブの配置などを工夫して、リードタブ等によって発電体を保護するようにしているので、面倒な製造工程や、製造工程の増加に伴う製造コストの増加を伴うことなく、強度がある二次電池の軽量化、小型化を図ることができる。
【図面の簡単な説明】
【図１】本発明の実施形態１の二次電池の斜視図である。
【図２】図１の二次電池の分解断面図である。
【図３】図１の二次電池の断面図である。
【図４】本発明の実施形態２の二次電池の断面図である。
【図５】図４に示す二次電池の製造概略図である。
【図６】従来の二次電池の分解斜視図である。
【図７】従来の二次電池の断面図である。
【符号の説明】
１ 負極体
１ａ 負極体の電極集電部
２ 正極体
２ａ 正極体の電極集電部
３ セパレータ
４ 負極リードタブ
５ 正極リードタブ
６ ラミネートフィルム[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery and a portable device including the same, and more particularly, a laminated type laminated film secondary battery and a personal information assistant device (Personal Digital Assistant: PDA), a mobile phone, and a notebook. The present invention relates to a portable device such as a personal computer.
[0002]
[Prior art]
Conventionally, there is a secondary battery in which a power generation body in which positive and negative electrode bodies are alternately laminated via a separator is covered with a laminate film.
[0003]
(Prior art 1)
FIG. 6 is an exploded perspective view of a conventional secondary battery. FIG. 7 is a cross-sectional view of a conventional secondary battery. In FIG. 6, a laminate film is not shown for convenience of explanation.
[0004]
In FIG. 6 and the like, for example, six separators 3, three negative electrode bodies 1 and two positive electrode bodies 2 positioned alternately between the separators 3, one end of each negative electrode body 1 and each positive electrode body 2 are shown. The electrode current collectors 1a and 2a exposed to each other, and the negative electrode lead tab 4 and the positive electrode lead tab 5 connected to the electrode current collectors 1a and 2a by welding or the like are shown.
[0005]
Each of the negative electrode body 1 and the positive electrode body 2 is obtained by applying an active material to a metal foil. And the negative electrode lead tab 4 and the positive electrode lead tab 5 are connected so that these may not overlap. A non-aqueous electrolyte solution is injected into the laminate film 6.
[0006]
Since the power generation body (separator 3, negative electrode body 1 and positive electrode body 2) of such a secondary battery is only covered with the laminate film 6, it was vulnerable to external forces such as impact and crushing.
[0007]
(Prior art 2)
In contrast to the prior art 1, for example, Japanese Patent Application Laid-Open Nos. 60-65442 and 60-117542 describe secondary batteries in which a laminate film covering a power generator is covered with an ultraviolet curable resin.
[0008]
[Problems to be solved by the invention]
However, since the related art 2 includes the ultraviolet curable resin, the secondary battery becomes heavier by that amount, and the secondary battery becomes thicker accordingly. As a result, it is difficult to reduce the weight and size of the electrical device on which the secondary battery is mounted. Therefore, it is not suitable for mounting on a portable device such as a PDA.
[0009]
Furthermore, in the conventional technique 2, a process of applying the ultraviolet curable resin to the laminate film and a process of curing the applied ultraviolet curable resin are indispensable, and the manufacturing process is complicated compared to the conventional technique 1.
[0010]
Therefore, an object of the present invention is to reduce the weight and size of a strong secondary battery without a troublesome manufacturing process and an increase in manufacturing cost accompanying an increase in the manufacturing process.
[0011]
In order to solve the above-described problems, the present invention provides a secondary battery in which a power generation body in which a positive electrode body and a negative electrode body are alternately laminated via an insulating separator is covered with a laminate film. From the alternately stacked positive and negative electrode bodies, an electrode current collector of the positive electrode and an electrode current collector of the negative electrode are drawn in opposite directions, and the electrode current collector of the positive electrode is drawn from the positive electrode. The negative electrode body is connected to the positive electrode lead tab on the opposite side to the negative electrode body, and the negative electrode body is connected to the negative electrode lead tab on the opposite side of the negative electrode body. an electrode current collector of the negative electrode body, by routed to wrap the upper and lower side of the power generating body, wherein the electrode current collector of the positive electrode and the negative electrode body of the electrode current collector is the power generating body Clamping from both sides of the upper and lower surfaces And wherein the Dale.
Further, the present invention provides a secondary battery in which a power generation body in which a positive electrode body and a negative electrode body are alternately laminated via an insulating separator is covered with a laminate film. As an electrode current collector, it is exposed to the outside from the power generator, and at the other end of the power generator opposite to the electrode current collector of the positive electrode, as an electrode current collector of the negative electrode, outside the power generator A positive electrode lead tab is connected to the electrode current collector portion of the positive electrode body, and a negative electrode lead tab is connected to the electrode current collector portion of the negative electrode body. The positive electrode lead tab is connected to the negative electrode body from the electrode current collector portion of the positive electrode body. The negative electrode lead tab is drawn from the electrode current collector portion of the negative electrode body in the opposite direction toward the electrode current collector portion of the positive electrode body, and the positive electrode lead tab and the negative electrode lead tab are Top side of power generator By routed to wrap from below, and the positive electrode lead tab and the negative electrode lead tab is characterized in that sandwich the power generating body from both sides of the upper and lower side.
[0012]
Moreover, the portable device of the present invention is equipped with the secondary battery.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0014]
(Embodiment 1)
[Description of configuration]
FIG. 1 is a perspective view of a secondary battery according to Embodiment 1 of the present invention. FIG. 2 is an exploded cross-sectional view of the secondary battery of FIG. FIG. 3 is a cross-sectional view of the secondary battery of FIG. In addition, illustration of the laminate film 3 is abbreviate | omitted in FIG.
[0015]
In FIG. 1 and the like, for example, six separators 3, three negative electrode bodies 1 and two positive electrode bodies 2 positioned alternately between the separators 3, one end of each negative electrode body 1 and each positive electrode body 2 are shown. Electrode current collectors 1a, 2a exposed to electrode, negative electrode lead tab 4 and positive electrode lead tab 5 connected to electrode current collectors 1a, 2a by welding, etc., and connection part and electrode between electrode current collector 1a and positive electrode lead tab 5 The insulating sheet 7 provided in the connection part of the current collection part 2a and the negative electrode lead tab 4 is shown.
[0016]
The negative electrode body 1 is obtained by coating a copper foil sheet with a hard carbon-based negative electrode active material including carbon that collects and releases lithium ions and the like. The thickness of the negative electrode active material is about 50 μm, and the thickness of the copper foil sheet is about 15 μm. Moreover, the dimension of the negative electrode body 1 is 70 mm x 125 mm.
[0017]
The positive electrode body 2 is obtained by applying a positive electrode active material such as a lithium ion-containing metal oxide including a lithium manganese composite oxide that collects and releases lithium ions and the like to an aluminum foil sheet. The thickness of the positive electrode active material is about 70 μm, and the thickness of the aluminum foil sheet is about 20 μm. The dimension of the positive electrode body 2 is set to 65 mm × 120 mm.
[0018]
The separator 3 is a sheet-like resin having a thickness of about 25 μm that is porous and insulating. Here, a laminated separator of a polyethylene film and a polypropylene film is used. The size of the separator 3 is 75 mm × 130 mm.
[0019]
The power generation body having the negative electrode body 1, the positive electrode body 2, and the separator 3 is sealed with a laminate film 6 in a state where a nonaqueous electrolytic solution is injected. Here, as the non-aqueous electrolyte, a solution obtained by dissolving lithium hexafluorophosphate in a non-aqueous solvent of propylene carbonate and methyl ethyl carbonate is used.
[0020]
The negative electrode lead tab 4 is made of nickel or the like having a thickness of about 100 μm. The positive electrode lead tab 5 is made of aluminum having a thickness of about 100 μm. The dimensions of the negative electrode lead tab 4 and the positive electrode lead tab 5 are 160 mm × 65 mm, respectively.
[0021]
The laminate film 6 is made of an aluminum foil having a thickness of about 100 μm.
[0022]
The strength test of the secondary battery shown in FIG. The strength test was performed when a pressure rod having an iron ball with a radius of 0.5 mm at the tip was pressed against the center of gravity of the widest surface of the secondary battery shown in FIG. 1 or the like in a load range of 10 kgf to 50 kgf. This is to investigate the possibility of short circuit. For comparison, the strength test of the secondary battery of Prior Art 1 was also conducted.
[0023]
When a load of 10 kgf was applied, both the secondary batteries were indented but did not short-circuit. However, the indentation of the secondary battery of the prior art 1 was larger than the indentation of the laminated laminate film secondary battery of this embodiment.
[0024]
When a load of 20 kgf was applied, the laminated laminate film secondary battery of this embodiment was not short-circuited. On the other hand, about 70% of the secondary batteries of the prior art 1 were short-circuited due to cracks in the laminate film. However, even if the secondary battery of Prior Art 1 is not short-circuited, a large impression was formed as compared with the impression of the laminated laminate film secondary battery of this embodiment.
[0025]
When a load of 30 kgf was applied, the laminated laminate film secondary battery of this embodiment was not short-circuited. On the other hand, all the secondary batteries of Prior Art 1 were short-circuited due to cracks in the laminate film.
[0026]
Even when loads of 40 kgf and 50 kgf were applied, the secondary battery did not short-circuit the laminated laminate film of this embodiment. From this, it was found that the secondary battery of the present embodiment has a resistance to local impacts that is twice or more that of the secondary battery of Prior Art 1.
[0028]
In addition, the secondary battery is not limited to a secondary battery having a configuration in which the negative electrode lead tab 4 and the positive electrode lead tab 5 are opposed to each other. The present invention can also be applied to a secondary battery.
[0029]
(Embodiment 2)
FIG. 4 is a cross-sectional view of the secondary battery according to Embodiment 2 of the present invention. FIG. 5 is a manufacturing schematic diagram of the secondary battery shown in FIG. 4 and 5, the same reference numerals are given to the same parts as those in FIG.
[0030]
In the secondary battery of this embodiment, the electrode current collectors 1a and 2a are lengthened, and these are respectively routed around the power generator under the separator 6, and the electrode current collectors 1a and 2a serve as a power generator. I try to protect it.
[0031]
The secondary battery configured as shown in the present embodiment can further protect the power generator as the number of positive electrodes 2 and negative electrodes 1, that is, the number of electrode current collectors 1 a and 2 a increases. . In practice, an electrode body in which an active material is applied only on one side only to the outermost layer is used.
[0032]
As described above, the laminate-type laminated film secondary battery according to each embodiment of the present invention is small, light, and strong, so that it can be used as a portable information communication device for personal use, a mobile phone, and a notebook personal computer. When mounted on a portable device such as a computer, the portability of the portable device is improved.
[0033]
【Effect of the invention】
As described above, according to the present invention, the arrangement of the lead tabs is devised to protect the power generation body with the lead tabs, etc., so the troublesome manufacturing process and the increase in the manufacturing cost accompanying the increase in the manufacturing process are required. Therefore, the secondary battery having strength can be reduced in weight and size.
[Brief description of the drawings]
FIG. 1 is a perspective view of a secondary battery according to Embodiment 1 of the present invention.
2 is an exploded cross-sectional view of the secondary battery of FIG.
3 is a cross-sectional view of the secondary battery of FIG.
FIG. 4 is a cross-sectional view of a secondary battery according to Embodiment 2 of the present invention.
5 is a manufacturing schematic diagram of the secondary battery shown in FIG. 4. FIG.
FIG. 6 is an exploded perspective view of a conventional secondary battery.
FIG. 7 is a cross-sectional view of a conventional secondary battery.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Negative electrode body 1a Electrode current collection part 2 of negative electrode body Positive electrode body 2a Electrode current collection part 3 of positive electrode body Separator 4 Negative electrode lead tab 5 Positive electrode lead tab 6 Laminate film

Claims (5)

絶縁性を有するセパレータを介して交互に正極体と負極体とが積層された発電体をラミネートフィルムで覆った二次電池において、
前記発電体の交互に積層された正極体と負極体から互いに反対方向に正極体の電極集電部と負極体の電極集電部とが引き出され、前記正極体の電極集電部が前記正極体から引き出された方向の反対側で正極リードタブに接続され、前記負極体の電極集電部が前記負極体から引き出された方向の反対側で負極リードタブに接続され、前記正極体の電極集電部と前記負極体の電極集電部とを、前記発電体の上面側と下面側から包み込むように引き回すことによって、前記正極体の電極集電部と前記負極体の電極集電部とが前記発電体を前記上面側と下面側の両側から挟み込んでいることを特徴とする二次電池。In a secondary battery in which a power generation body in which a positive electrode body and a negative electrode body are alternately laminated via a separator having an insulating property is covered with a laminate film,
An electrode current collector of the positive electrode body and an electrode current collector of the negative electrode body are drawn out from the alternately stacked positive and negative electrode bodies in opposite directions , and the electrode current collector of the positive electrode body is Connected to the positive electrode lead tab on the opposite side of the direction drawn from the positive electrode body, and connected to the negative electrode lead tab on the opposite side of the negative electrode body in the direction drawn from the negative electrode body. The electrode current collector of the positive electrode body and the electrode current collector of the negative electrode body are drawn by routing the electric part and the electrode current collector of the negative electrode body so as to be wrapped from the upper surface side and the lower surface side of the power generator. A secondary battery, wherein the power generator is sandwiched from both the upper surface side and the lower surface side. 前記電極集電部は、前記正極体と負極体からそれぞれ引き出された集電箔であることを特徴とする請求項１に記載の二次電池。The secondary battery according to claim 1, wherein the electrode current collector is a current collector foil drawn from each of the positive electrode body and the negative electrode body. 絶縁性を有するセパレータを介して交互に正極体と負極体とが積層された発電体をラミネートフィルムで覆った二次電池において、
前記発電体の一端側では前記正極体の電極集電部として前記発電体から外側に露出し、前記正極体の電極集電部とは反対側の前記発電体の他端側では前記負極体の電極集電部として前記発電体の外側に露出し、
前記正極体の電極集電部には正極リードタブが、前記負極体の電極集電部には負極リードタブがそれぞれ接続され、
前記正極リードタブは前記正極体の電極集電部から前記負極体の電極集電部に向けて、前記負極リードタブは前記負極体の電極集電部から前記正極体の電極集電部に向けて互いに反対方向に引き出され、
前記正極リードタブと負極リードタブとを、前記発電体の上面側と下面側から包み込むように引き回すことによって、前記正極リードタブと負極リードタブとが前記発電体を前記上面側と下面側の両側から挟み込んでいることを特徴とする二次電池。In a secondary battery in which a power generation body in which a positive electrode body and a negative electrode body are alternately laminated via a separator having an insulating property is covered with a laminate film,
One end of the power generator is exposed to the outside of the power generator as an electrode current collector of the positive electrode, and the other end of the power generator opposite to the electrode current collector of the positive electrode Exposed to the outside of the power generator as an electrode current collector,
A positive electrode lead tab is connected to the electrode current collector portion of the positive electrode body, and a negative electrode lead tab is connected to the electrode current collector portion of the negative electrode body, respectively.
The positive electrode lead tab is directed from the electrode current collector portion of the positive electrode body toward the electrode current collector portion of the negative electrode body, and the negative electrode lead tab is directed from the electrode current collector portion of the negative electrode body toward the electrode current collector portion of the positive electrode body. Pulled in the opposite direction,
The positive electrode lead tab and the negative electrode lead tab are routed so as to be wrapped from the upper surface side and the lower surface side of the power generator, so that the positive electrode lead tab and the negative electrode lead tab sandwich the power generator from both the upper surface side and the lower surface side. A secondary battery characterized by that. 前記正極リードタブは前記発電体の一端側で外側に露出した前記負極体の電極集電部との間で絶縁部材で絶縁され、前記負極リードタブは前記発電体の他端側で外側に露出した前記正極体の電極集電部との間で絶縁部材で絶縁されていることを特徴とする請求項３に記載の二次電池。The positive electrode lead tab is insulated by an insulating member between the electrode current collector of the negative electrode body exposed to the outside on one end side of the power generator, and the negative electrode lead tab is exposed to the outside on the other end side of the power generator. The secondary battery according to claim 3 , wherein the secondary battery is insulated from the electrode current collector of the positive electrode body by an insulating member. 請求項１乃至４のいずれか１項に記載の二次電池を搭載することを特徴とする携帯機器。A portable device comprising the secondary battery according to any one of claims 1 to 4 .
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EP1995816B1 (en) * 2006-03-20 2015-08-12 Citic Guoan Mengguli New Energy Technology Co., Ltd. A soft packaged and high capacity lithium ion battery and the manufacture method of the same
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