JP3859333B2 - Battery and manufacturing method - Google Patents
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- JP3859333B2 JP3859333B2 JP33920797A JP33920797A JP3859333B2 JP 3859333 B2 JP3859333 B2 JP 3859333B2 JP 33920797 A JP33920797 A JP 33920797A JP 33920797 A JP33920797 A JP 33920797A JP 3859333 B2 JP3859333 B2 JP 3859333B2
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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
Description
【０００１】
【発明の属する技術分野】
本発明は、電池及びその製造方法に関するものである。
【０００２】
【従来の技術】
近年、ノート型パソコンを初めとし、二次電池の需要が伸びてきている。それに伴い、電池のエネルギ密度向上に対する要求も強まり、電池ケースの軽量化や薄膜化が求められている。また、形状の多様化も進んでおり、成形性の向上が期待される。
従来の電池を構成する単位セルの包装ケースには、アルミニウム単体が用いられている。しかし、金属の電池ケースは重くまた厚みが厚い。また、金属の電池ケースは硬く様々な形状に成形するのが困難である。一方、電解液のバリア性や水分に対する防湿性の問題から、単一のプラスチックフィルムで電池ケースを作製するのも困難であった。
【０００３】
【発明が解決しようとする課題】
本発明は金属単一の電池ケースに替わり、軽量で薄く、成形性が向上した電池ケースを使用した電池を提供することにある。
【０００４】
【課題を解決するための手段】
本発明は、電池構成材料である正負極とそこに注入された電解液を封入するケースとフタ材からなる電池であって、ケースが、外層及び第３層はポリエステル、ポリプロピレンいずれかの二軸延伸フィルムであり、第２層に成形可能な金属層を有し、内層がヒートシール性を有するシーラントからなる多層フィルムで構成される電池である。更に好ましい形態としては６０℃・１６８時間放置後、電解液減少率が０．５％以下で、かつ系内への水分増加率が１０ppm以下であり、該金属層がＣｕの含有率が１０〜７０％のアルミニウムで、厚みが１５〜１００μｍであり、該ケースとフタ材の接着強度が５kg/２５mm以上であり、かつフタ材はケースと同一多層フィルムである電池である。
また、電池構成材料である正負極とそこに注入された電解液を封入するケースが、外層及び第３層はポリエステル、ポリプロピレンいずれかの二軸延伸フィルムであり、第２層に成形可能な金属層を有し、内層がヒートシール性を有するシーラントからなり、該ケースを開口部の長軸（Ｄ）と深さ（Ｌ）の比（Ｌ/Ｄ）が０．０３以上となるように冷間成形して、フタ材をヒートシールしてなる電池の製造方法である。
【０００５】
【発明の実施の形態】
本発明に用いられる二軸延伸フィルムには、ポリエステルかポリプロピレンを使用し、その厚みは５〜５０μｍ、より好ましくは、１５〜４０μｍである。厚みが５μｍ未満では、成形時に金属層が裂けてしまう。厚みが５０μｍを超えると、多層フィルムが１００μｍより大きくなり、従来の金属単一ケースの厚みと同等になり、本発明のメリットがなくなる。
【０００６】
本発明に用いられる電池ケースのバリア性は、６０℃・１６８時間放置後、電解液減少率が０．５％以下であり、かつ系内への水分増加率が１０ppm以下である。電解液減少率が０．５％を超えると電池容量が低下し信頼性が落ちてしまう。水分増加率が１０ppmを超えると、Liイオンと水分が化合し充放電特性が劣化する。
【０００７】
本発明に用いられる成形可能な金属層は、Ｃｕの含有率が１０〜７０％、より好ましくは３０〜５０％であるアルミニウムである。含有率が１０％未満では、成形時に金属層が裂けてしまう。含有率が７０％を超えると、製造が困難になる。アルミニウムの厚みは、１５〜１００μｍ、より好ましくは２０〜４０μｍである。厚みが１５μｍ未満では、成形時にピンホール等が生じる。厚みが１００μｍを超えると重量が重くなり本発明のメリットがなくなる。
【０００８】
本発明に用いられるケースとフタ材の接着強度は５kgf/２５mm以上である。接着強度が５kgf/２５mm未満では、内圧によりケースが破壊され液漏れによる危険が生じる。
本発明に用いられるシーラント材料は接着強度が５kgf/２５mm以上であれば特に限定しないが、例えばアイオノマー、ＥＭＭＡ、ＥＥＡ、ＥＭＡＡ等のエチレンとアクリルの共重合体またはマレイン酸変性オレフィン等が挙げられる。
【０００９】
本発明に用いられるケースの開口部の長軸（Ｄ）に対する深さ（Ｌ）の比（Ｌ/Ｄ）は、０．０３以上である。比が０．０３未満では電池構成材料をケース内に納めるのが困難になる。
【００１０】
【実施例】
以下に実施例を挙げて発明の効果を詳細に説明するが、これは単なる例示であり本発明はこれに限定されるものではない。
図１に示した多層フィルムをドライラミネート法により製膜し、冷間成形により成形を行い、同種の多層フィルムシートでシールを行い、図２に示した電池ケースを得た。
得られた電池ケースの重量測定を行い、中に電解液を２．６〜２．８g入れ、６０℃・１６８時間放置後の電解液減少率と水分増加率の測定を行った。
【００１１】
（実施例1）
外層のフィルムに厚み25μｍのPET、成形可能な金属層にCuを30%含む厚み20μｍのアルミニウム、第3層のフィルムに厚み25μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（実施例2）
外層のフィルムに厚み30μｍのPET、成形可能な金属層にCuを35%含む厚み30μｍのアルミニウム、第3層のフィルムに厚み30μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（実施例3）
外層のフィルムに厚み35μｍのPET、成形可能な金属層にCuを35%含む厚み25μｍのアルミニウム、第3層のフィルムに厚み35μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（実施例4）
外層のフィルムに厚み35μｍのPET、成形可能な金属層にCuを30%含む厚み40μｍのアルミニウム、第3層のフィルムに厚み35μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
【００１２】
（比較例1）
厚みが300μｍのアルミニウムからなり、開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（比較例2）
外層のフィルムに厚み25μｍのPET、第3層のフィルムに厚み25μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（比較例3）
外層のフィルムに厚み30μｍのO-Ny、成形可能な金属層にCuを35%含む厚み25μｍのアルミニウム、第3層のフィルムに厚み30μｍのO-Nyを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（比較例4）
外層のフィルムに厚み3μｍのPET、成形可能な金属層にCuを30%含む厚み30μｍのアルミニウム、第3層のフィルムに厚み3μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
【００１３】
（比較例5）
外層のフィルムに厚み25μｍのPET、成形可能な金属層にCuを5%含む厚み20μｍのアルミニウム、第3層のフィルムに厚み25μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（比較例6）
外層のフィルムに厚み25μｍのPET、成形可能な金属層にCuを35%含む厚み10μｍのアルミニウム、第3層のフィルムに厚み25μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（比較例7）
外層のフィルムに厚み30μｍのPET、成形可能な金属層にCuを35%含む厚み25μｍのアルミニウム、第3層のフィルムに厚み30μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.012となる成形を行い、接着強度が6.5kg/25mmとなるシールを行った。
（比較例8）
外層のフィルムに厚み25μｍのPET、成形可能な金属層にCuを25%含む厚み20μｍのアルミニウム、第3層のフィルムに厚み25μｍのPETを使用した。開口部の長軸（D）に対する深さ（L）の比（L/D）が0.034となる成形を行い、接着強度が1.2kg/25mmとなるシールを行った。
【００１４】
実施例及び比較例の電池ケース構成と測定結果を表１〜３に示す。
表中の略号 ＰＥＴ：二軸延伸ポリエチレンテレフタレートフィルム
Ｏ‐Ｎｙ：二軸延伸ナイロンフィルム
【００１５】
【表１】
【表２】
【表３】
【発明の効果】
本発明によれば、軽量で薄く、成形性が向上した電池ケースを提供することができ、このような電池ケースは、近年のエネルギ密度向上や形状の多様化に対する要求に答えることができる。
【図面の簡単な説明】
【図１】本発明で使用されている多層フィルムの層構成を示す断面図である。
【図２】本発明の電池を示す断面図である。
【符号の説明】
１：外層
２：第２層（金属層）
３：第３層
４：内層（ヒートシーラント層）
５：フタ材
６：ケース[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery and a manufacturing method thereof.
[0002]
[Prior art]
In recent years, demand for secondary batteries, such as notebook computers, has increased. Along with this, demands for improving the energy density of batteries have increased, and there has been a demand for lighter and thinner battery cases. In addition, diversification of shapes is progressing, and improvement of moldability is expected.
A single unit of aluminum is used for a packaging case of a unit cell constituting a conventional battery. However, metal battery cases are heavy and thick. Metal battery cases are hard and difficult to mold into various shapes. On the other hand, it was also difficult to produce a battery case with a single plastic film due to problems of barrier properties of the electrolyte and moisture resistance against moisture.
[0003]
[Problems to be solved by the invention]
It is an object of the present invention to provide a battery using a battery case that is lightweight, thin, and has improved formability, instead of a single metal battery case.
[0004]
[Means for Solving the Problems]
The present invention is a battery comprising a positive and negative electrode, which is a battery constituent material, and a case enclosing an electrolyte solution injected therein and a lid material, wherein the case is biaxially formed of either polyester or polypropylene as the outer layer and the third layer. The battery is a stretched film having a moldable metal layer as a second layer, and an inner layer made of a multilayer film made of a sealant having heat sealability. As a more preferable form, after leaving at 60 ° C. for 168 hours, the rate of decrease in electrolyte is 0.5% or less, the rate of increase in water into the system is 10 ppm or less, and the metal layer has a Cu content of 10 to 10%. The battery is made of 70% aluminum, has a thickness of 15 to 100 μm, has an adhesive strength of 5 kg / 25 mm or more between the case and the lid material, and the lid material is the same multilayer film as the case.
In addition, the case that encloses the positive and negative electrodes, which are battery constituent materials, and the electrolyte injected therein, the outer layer and the third layer are biaxially stretched films of either polyester or polypropylene, and the metal that can be formed into the second layer The case is cooled so that the ratio of the major axis (D) to the depth (L) (L / D) of the opening is 0.03 or more. This is a method for producing a battery which is formed by hot molding and heat sealing a lid material.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
For the biaxially stretched film used in the present invention, polyester or polypropylene is used, and the thickness thereof is 5 to 50 μm, more preferably 15 to 40 μm. If the thickness is less than 5 μm, the metal layer is torn during molding. When the thickness exceeds 50 μm, the multilayer film becomes larger than 100 μm, which is equivalent to the thickness of a conventional metal single case, and the merit of the present invention is lost.
[0006]
The battery case used in the present invention has a barrier property of an electrolyte decrease rate of 0.5% or less after standing at 60 ° C. for 168 hours, and a moisture increase rate of 10 ppm or less in the system. When the electrolytic solution decrease rate exceeds 0.5%, the battery capacity is reduced and the reliability is lowered. If the moisture increase rate exceeds 10 ppm, Li ions and moisture combine to deteriorate charge / discharge characteristics.
[0007]
The moldable metal layer used in the present invention is aluminum having a Cu content of 10 to 70%, more preferably 30 to 50%. If the content is less than 10%, the metal layer is torn during molding. If the content exceeds 70%, production becomes difficult. The thickness of aluminum is 15-100 micrometers, More preferably, it is 20-40 micrometers. If the thickness is less than 15 μm, pinholes and the like are generated during molding. If the thickness exceeds 100 μm, the weight increases and the merit of the present invention is lost.
[0008]
The adhesive strength between the case and the lid material used in the present invention is 5 kgf / 25 mm or more. If the adhesive strength is less than 5 kgf / 25 mm, the case is destroyed by internal pressure, and there is a risk of liquid leakage.
The sealant material used in the present invention is not particularly limited as long as the adhesive strength is 5 kgf / 25 mm or more, and examples thereof include ethylene and acrylic copolymers such as ionomer, EMMA, EEA, and EMAA, or maleic acid-modified olefins.
[0009]
The ratio (L / D) of the depth (L) to the long axis (D) of the opening of the case used in the present invention is 0.03 or more. If the ratio is less than 0.03, it is difficult to store the battery constituent material in the case.
[0010]
【Example】
The effects of the invention will be described in detail below with reference to examples. However, this is merely an example, and the present invention is not limited thereto.
The multilayer film shown in FIG. 1 was formed by dry lamination, formed by cold forming, and sealed with the same kind of multilayer film sheet to obtain the battery case shown in FIG.
The obtained battery case was weighed, 2.6 to 2.8 g of the electrolyte was put therein, and the electrolyte decrease rate and moisture increase rate after standing at 60 ° C. for 168 hours were measured.
[0011]
(Example 1)
PET having a thickness of 25 μm was used for the outer layer film, aluminum having a thickness of 20 μm containing 30% Cu for the moldable metal layer, and PET having a thickness of 25 μm for the third layer. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Example 2)
PET having a thickness of 30 μm was used for the outer layer film, aluminum having a thickness of 30 μm containing 35% Cu for the moldable metal layer, and PET having a thickness of 30 μm for the third layer film. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Example 3)
The outer film was 35 μm thick PET, the moldable metal layer was 35 μm thick aluminum containing 35% Cu, and the third layer film was 35 μm thick PET. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Example 4)
PET with a thickness of 35 μm was used for the outer film, aluminum with a thickness of 40 μm containing 30% Cu as the moldable metal layer, and PET with a thickness of 35 μm for the third layer. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
[0012]
(Comparative Example 1)
Made of aluminum with a thickness of 300μm, the ratio of depth (L) to long axis (D) of the opening (L / D) was set to 0.034, and sealing was performed with an adhesive strength of 6.5kg / 25mm. .
(Comparative Example 2)
PET having a thickness of 25 μm was used for the outer layer film and PET having a thickness of 25 μm was used for the third layer film. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Comparative Example 3)
O-Ny with a thickness of 30 μm was used for the outer layer film, aluminum with a thickness of 25 μm containing 35% Cu was used for the moldable metal layer, and O-Ny with a thickness of 30 μm was used for the third layer film. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Comparative Example 4)
PET having a thickness of 3 μm was used for the outer layer film, aluminum having a thickness of 30 μm containing 30% Cu was used for the moldable metal layer, and PET having a thickness of 3 μm was used for the third layer film. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
[0013]
(Comparative Example 5)
PET having a thickness of 25 μm was used for the outer layer film, aluminum having a thickness of 20 μm containing 5% Cu for the moldable metal layer, and PET having a thickness of 25 μm for the third layer. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Comparative Example 6)
PET having a thickness of 25 μm was used as the outer layer film, aluminum having a thickness of 10 μm containing 35% Cu as the moldable metal layer, and PET having a thickness of 25 μm as the third layer film. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Comparative Example 7)
PET having a thickness of 30 μm was used for the outer layer film, aluminum having a thickness of 25 μm containing 35% Cu was used for the moldable metal layer, and PET having a thickness of 30 μm was used for the third layer film. Molding was performed so that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.012, and sealing was performed with an adhesive strength of 6.5 kg / 25 mm.
(Comparative Example 8)
PET having a thickness of 25 μm was used for the outer layer film, aluminum having a thickness of 20 μm containing 25% Cu for the moldable metal layer, and PET having a thickness of 25 μm for the third layer. Molding was performed such that the ratio (L / D) of the depth (L) to the long axis (D) of the opening was 0.034, and sealing was performed with an adhesive strength of 1.2 kg / 25 mm.
[0014]
Tables 1 to 3 show battery case configurations and measurement results of Examples and Comparative Examples.
Abbreviations in the table PET: Biaxially stretched polyethylene terephthalate film
O-Ny: Biaxially stretched nylon film
[Table 1]
[Table 2]
[Table 3]
【The invention's effect】
According to the present invention, it is possible to provide a battery case that is lightweight, thin, and has improved moldability. Such a battery case can meet the recent demands for improved energy density and diversification of shapes.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing the layer structure of a multilayer film used in the present invention.
FIG. 2 is a cross-sectional view showing a battery of the present invention.
[Explanation of symbols]
1: Outer layer 2: Second layer (metal layer)
3: Third layer 4: Inner layer (heat sealant layer)
5: Lid material 6: Case
Claims (5)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33920797A JP3859333B2 (en) | 1997-12-10 | 1997-12-10 | Battery and manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33920797A JP3859333B2 (en) | 1997-12-10 | 1997-12-10 | Battery and manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11176397A JPH11176397A (en) | 1999-07-02 |
| JP3859333B2 true JP3859333B2 (en) | 2006-12-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33920797A Expired - Fee Related JP3859333B2 (en) | 1997-12-10 | 1997-12-10 | Battery and manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3859333B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100369070B1 (en) * | 1999-11-09 | 2003-01-24 | 삼성에스디아이 주식회사 | Material for battery case |
| JP5772412B2 (en) * | 2011-09-07 | 2015-09-02 | 凸版印刷株式会社 | Lithium ion battery exterior material, lithium ion battery |
| WO2016080797A1 (en) * | 2014-11-19 | 2016-05-26 | 주식회사 엘지화학 | Pouch exterior for secondary battery and pouch-type secondary battery comprising same |
| JP6580684B2 (en) | 2014-11-19 | 2019-09-25 | エルジー・ケム・リミテッド | Pouch exterior material for secondary battery and pouch-type secondary battery including the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10261386A (en) * | 1997-03-19 | 1998-09-29 | Asahi Chem Ind Co Ltd | Battery case and battery |
| JP3583589B2 (en) * | 1997-08-26 | 2004-11-04 | 東芝電池株式会社 | Sheet type battery |
| JP3583909B2 (en) * | 1997-09-12 | 2004-11-04 | 東芝電池株式会社 | Sheet type battery |
| JP3457856B2 (en) * | 1997-09-19 | 2003-10-20 | 東芝電池株式会社 | Polymer electrolyte secondary battery |
| JPH11176398A (en) * | 1997-12-10 | 1999-07-02 | Sumitomo Bakelite Co Ltd | Battery and its manufacture |
-
1997
- 1997-12-10 JP JP33920797A patent/JP3859333B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11176397A (en) | 1999-07-02 |
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