JPH11176398A - Battery and its manufacture - Google Patents
Battery and its manufactureInfo
- Publication number
- JPH11176398A JPH11176398A JP9339208A JP33920897A JPH11176398A JP H11176398 A JPH11176398 A JP H11176398A JP 9339208 A JP9339208 A JP 9339208A JP 33920897 A JP33920897 A JP 33920897A JP H11176398 A JPH11176398 A JP H11176398A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- case
- layer
- ethylene
- multilayer film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【０００１】[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。TECHNICAL FIELD The present invention relates to a battery and a method for manufacturing the battery.
【０００２】[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った。2. Description of the Related Art In recent years, demand for secondary batteries, including notebook type personal computers, has been increasing. Along with this, there is a growing demand for an improvement in the energy density of the battery, and there is a demand for a lighter and thinner battery case. In addition, diversification of the shape is progressing, and improvement in moldability is expected. BACKGROUND ART A simple case of aluminum is used for a packaging case of a unit cell constituting a conventional battery. However, metal battery cases are heavy and thick. In addition, metal battery cases are hard and difficult to form into various shapes.
【０００３】[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。SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery using a battery case which is lightweight, thin and has improved moldability, instead of a single metal battery case.
【０００４】[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、ケースが一層にポリ
クロロトリフルオロエチレン層（ＰＣＴＦＥ）を含み、
かつ最内層がアイオノマー、エチレン−メチルメタクリ
レート（以下ＥＭＭＡとする）、エチレン−エチルアク
リレート（ＥＥＡ）、エチレン−メタクリル酸共重合体
（ＥＭＡＡ）、またはマレイン酸変性オレフィンのいず
れかからなり、最外層が０．０１〜０．０７μｍの厚み
からなるシリカが蒸着されたポリエステルである多層フ
ィルムであり、６０℃・１６８時間放置後の電解液減少
率が０．５％以下の電池である。更に好ましい形態とし
て、該多層フィルムのＪＩＳ Ｋ ７１２９ Ｂ法による
水蒸気透過率が４０℃９０％ＲＨ下で０．５ｇ/ｍ2・２
４hr以下であり、１００℃、４８時間加熱処理後、ケー
スとフタ材との接着強度が２kg/２５mm以上であり、フ
タ材はケースと同一多層フィルムであり、最内層の厚み
が５０〜１００μｍの電池である。また本発明は、ケー
スを成形後シリカ蒸着する電池の製造方法である。SUMMARY OF THE INVENTION The present invention relates to a battery comprising a positive electrode and a negative electrode which are constituent materials of a battery, a case for enclosing an electrolytic solution injected therein, and a lid material, wherein the case is made of polychlorotrifluoro. Including an ethylene layer (PCTFE),
And the innermost layer is made of any of ionomer, ethylene-methyl methacrylate (hereinafter referred to as EMMA), ethylene-ethyl acrylate (EEA), ethylene-methacrylic acid copolymer (EMAA), or maleic acid-modified olefin, and the outermost layer is It is a multilayer film of a polyester having a thickness of 0.01 to 0.07 μm on which silica is deposited and having a reduction rate of an electrolyte of 0.5% or less after being left at 60 ° C. for 168 hours. As a further preferred form, the multilayer JIS K 7129 B method 0.5g / m 2 · 2 under 40 ° C. 90% RH is water vapor transmission rate due to the film
4 hours or less, after heat treatment at 100 ° C. for 48 hours, the adhesive strength between the case and the lid material is 2 kg / 25 mm or more, the lid material is the same multilayer film as the case, and the thickness of the innermost layer is 50 to 100 μm. Battery. Further, the present invention is a method for producing a battery in which a case is molded and then silica is vapor-deposited.
【０００５】[0005]
【発明の実施の形態】本発明の電池は、６０℃・１６８
時間放置後の電解液減少率が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。本発明に用いられる多層フィルムのＪＩＳ
Ｋ ７１２９ Ｂ法による水蒸気透過率が４０℃９０％
ＲＨ下で０．５ｇ/ｍ2・24hr以下であり、０．５gを越
えると電池の吸湿によりLiイオンと水分が化合し充放電
特性が劣化する。BEST MODE FOR CARRYING OUT THE INVENTION
The rate of decrease in electrolyte after standing for a time is 0.5% or less, and the rate of increase in water in the system is 10 ppm or less. If the rate of decrease in the electrolyte exceeds 0.5%, the battery capacity decreases and the reliability decreases. JIS of multilayer film used in the present invention
Water vapor transmission rate by K 7129 B method is 40 ° C 90%
It is 0.5 g / m 2 · 24 hr or less under RH. If it exceeds 0.5 g, the lithium ions and moisture combine due to moisture absorption of the battery, and the charge / discharge characteristics deteriorate.
【０００６】本発明に用いられる蒸着されるシリカの厚
みは、０．０１〜０．０７μｍであり、０．０１μｍ未
満では防湿効果が不十分であり、０．０７μｍを越えて
も防湿性は向上せず、製造コストが大幅にアップしてし
まう。本発明に用いられるフタ材はケースと同一多層フ
ィルムであり、最内層の厚みが５０〜１００μｍの多層
フィルムである。５０μｍ未満ではシール強度が不足
し、逆に１００μｍを超えるとケースが現行Ａｌ品より
も厚くなってしまい体積エネルギー密度を低下させる。The thickness of the silica to be deposited used in the present invention is from 0.01 to 0.07 μm. If it is less than 0.01 μm, the moisture-proof effect is insufficient, and if it exceeds 0.07 μm, the moisture-proof property is improved. Without this, the manufacturing cost will increase significantly. The lid material used in the present invention is the same multilayer film as the case, and the innermost layer has a thickness of 50 to 100 μm. If it is less than 50 μm, the sealing strength is insufficient, and if it exceeds 100 μm, the case becomes thicker than the current Al product and the volume energy density decreases.
【０００７】本発明に用いられるシーラント材料はアイ
オノマー、ＥＭＭＡ、ＥＥＡ、ＥＭＡＡ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のい
ずれかである。また、ケースとフタ材の接着強度は１０
０℃、４８時間加熱処理後に２kgf/２５mm以上である。
接着強度が２kgf/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。The sealant material used in the present invention is either an ionomer, EMMA, EEA, a copolymer of ethylene and acrylic of EMAA or a maleic acid-modified olefin. The bonding strength between the case and the lid material is 10
It is 2 kgf / 25 mm or more after heat treatment at 0 ° C. for 48 hours.
If the adhesive strength is less than 2 kgf / 25 mm, the case is destroyed by the internal pressure, and there is a danger of liquid leakage.
【０００８】[0008]
【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。ケースは図１に示した様にＰＣＴ
ＦＥを含む多層フィルムを製膜し、熱成形により成形を
行った後、ケース外側にシリカ蒸着を行い、同種の多層
フィルムシートをフタ材としてヒートシールを行い、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（ＤＥＣ/ＥＣ=１／１）を
２．６〜２．８ｇ入れ、６０℃・１６８時間放置後の電
解液減少率の測定を行った。 ＤＥＣ ：ジエチレンカーボネート ＥＣ ：エチレンカーボネート また、ヒートシールされた電池ケースについて１００
℃、４８時間の処理をした後、シール面のヒートシール
強度を測定した。尚、得られた多層フィルムの透湿度
は、シリカ蒸着されたフタ材をもちいて測定を行った。EXAMPLES The effects of the present invention will be described in detail below with reference to examples, but these are merely examples and the present invention is not limited thereto. Case is PCT as shown in FIG.
After forming a multilayer film containing FE and forming by thermoforming, silica deposition is performed on the outside of the case, and heat sealing is performed using the same type of multilayer film sheet as a lid material to obtain a battery case shown in FIG. Was. The weight of the obtained battery case is measured, 2.6 to 2.8 g of an electrolyte (DEC / EC = 1/1) is put therein, and the reduction rate of the electrolyte after leaving at 60 ° C. for 168 hours is measured. Was. DEC: diethylene carbonate EC: ethylene carbonate The heat-sealed battery case is 100
After the treatment at 48 ° C. for 48 hours, the heat sealing strength of the sealing surface was measured. The moisture permeability of the obtained multilayer film was measured using a lid material on which silica was deposited.
【０００９】実施例及び比較例の電池ケース構成と測定
結果を表１、２に示す。表中の略号は以下の通り ＰＥＴ ：ポリエチレンテレフタレート ＰＣＴＦＥ：ポリクロロトリフルオロエチレン ＥＭＭＡ ：エチレン−メチルメタアクリレート ＥＥＡ ：エチレン−エチルアクリレート ＥＭＡＡ ：エチレン−メタクリル酸共重合体 ＬＬ ：長鎖状低密度ポリエチレン ＬＤＰＥ ：低密度ポリエチレンTables 1 and 2 show the configurations and measurement results of the battery cases of the examples and comparative examples. Abbreviations in the table are as follows: PET: polyethylene terephthalate PCTFE: polychlorotrifluoroethylene EMMA: ethylene-methyl methacrylate EEA: ethylene-ethyl acrylate EMAA: ethylene-methacrylic acid copolymer LL: long-chain low-density polyethylene LDPE : Low density polyethylene
【００１０】[0010]
【表１】 [Table 1]
【００１１】[0011]
【表２】 [Table 2]
【００１２】[0012]
【発明の効果】本発明によれば、防湿性に優れた、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
提供することができ、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。According to the present invention, it is possible to provide a battery using a battery case which is excellent in moisture proofing, lightweight, thin and has improved moldability. Can answer requests.
【図1】 本発明で使用される多層フィルムの層構成を
示す断面図である。FIG. 1 is a cross-sectional view illustrating a layer configuration of a multilayer film used in the present invention.
【図2】 本発明の電池ケースを示す断面図である。FIG. 2 is a cross-sectional view illustrating a battery case of the present invention.
1：シリカ蒸着ＰＥＴ層 2：ＰＣＴＦＥ層 3：最内層（ヒートシーラント層） 1: PET layer deposited with silica 2: PCTFE layer 3: Innermost layer (heat sealant layer)
Claims (5)
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、ケースが一層にポリクロロトリフルオロエチレ
ン層を含み、かつ最内層がアイオノマー、エチレン−メ
チルメタクリレート、エチレン−エチルアクリレート、
エチレン−メタクリル酸共重合体、またはマレイン酸変
性オレフィンのいずれかからなり、最外層が０．０１〜
０．０７μｍの厚みからなるシリカが蒸着されたポリエ
ステルである多層フィルムであり、６０℃・１６８時間
放置後の電解液減少率が０．５％以下であることを特徴
とする電池。1. A battery comprising a positive electrode and a negative electrode which are battery constituent materials, a case for enclosing an electrolyte injected therein, and a lid material, wherein the case includes a polychlorotrifluoroethylene layer as one layer, and an innermost layer. Is an ionomer, ethylene-methyl methacrylate, ethylene-ethyl acrylate,
Ethylene-methacrylic acid copolymer or maleic acid-modified olefin, the outermost layer is 0.01 to
A battery comprising a multilayer film of polyester having a thickness of 0.07 μm and on which silica is vapor-deposited, wherein a reduction rate of an electrolyte after standing at 60 ° C. for 168 hours is 0.5% or less.
法による水蒸気透過率が４０℃９０％ＲＨ下で０．５ｇ
/ｍ2・２４hr以下である請求項１記載の電池。2. JIS K 7129 B multilayer film
0.5g at 40 ° C and 90% RH
The battery according to claim 1, which is not more than / m 2 · 24 hr.
とフタ材との接着強度が２kg/２５mm以上であり、フタ
材はケースと同一多層フィルムである請求項１又は２記
載の電池。3. The battery according to claim 1, wherein after the heat treatment at 100 ° C. for 48 hours, the adhesive strength between the case and the lid material is 2 kg / 25 mm or more, and the lid material is the same multilayer film as the case.
請求項１、２又は３記載の電池。4. The battery according to claim 1, wherein the innermost layer has a thickness of 50 to 100 μm.
徴とする請求項１、２、３又は４記載の電池の製造方
法。5. The method for producing a battery according to claim 1, wherein the case is formed and then silica is vapor-deposited.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9339208A JPH11176398A (en) | 1997-12-10 | 1997-12-10 | Battery and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9339208A JPH11176398A (en) | 1997-12-10 | 1997-12-10 | Battery and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11176398A true JPH11176398A (en) | 1999-07-02 |
Family
ID=18325271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9339208A Pending JPH11176398A (en) | 1997-12-10 | 1997-12-10 | Battery and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11176398A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11176397A (en) * | 1997-12-10 | 1999-07-02 | Sumitomo Bakelite Co Ltd | Battery and its manufacture |
| CN115377571A (en) * | 2022-09-14 | 2022-11-22 | 珠海冠宇电池股份有限公司 | Lithium battery packaging film and lithium battery |
-
1997
- 1997-12-10 JP JP9339208A patent/JPH11176398A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11176397A (en) * | 1997-12-10 | 1999-07-02 | Sumitomo Bakelite Co Ltd | Battery and its manufacture |
| CN115377571A (en) * | 2022-09-14 | 2022-11-22 | 珠海冠宇电池股份有限公司 | Lithium battery packaging film and lithium battery |
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