JP6319323B2 - 電池用包装材料 - Google Patents
電池用包装材料 Download PDFInfo
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- JP6319323B2 JP6319323B2 JP2015552476A JP2015552476A JP6319323B2 JP 6319323 B2 JP6319323 B2 JP 6319323B2 JP 2015552476 A JP2015552476 A JP 2015552476A JP 2015552476 A JP2015552476 A JP 2015552476A JP 6319323 B2 JP6319323 B2 JP 6319323B2
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- Prior art keywords
- layer
- metal layer
- base material
- battery
- thickness
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- 239000010410 layer Substances 0.000 claims description 271
- 229910052751 metal Inorganic materials 0.000 claims description 127
- 239000002184 metal Substances 0.000 claims description 127
- 239000000463 material Substances 0.000 claims description 80
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- 239000011888 foil Substances 0.000 claims description 35
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- PHFQLYPOURZARY-UHFFFAOYSA-N chromium trinitrate Chemical compound [Cr+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O PHFQLYPOURZARY-UHFFFAOYSA-N 0.000 description 2
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- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
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- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- FTBATIJJKIIOTP-UHFFFAOYSA-K trifluorochromium Chemical compound F[Cr](F)F FTBATIJJKIIOTP-UHFFFAOYSA-K 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
- 150000007934 α,β-unsaturated carboxylic acids Chemical class 0.000 description 1
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- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
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- Sealing Battery Cases Or Jackets (AREA)
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Description
項1. 少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が55〜140N/mm2であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1:1〜1:3の範囲にある、電池用包装材料。
項2. 前記基材層が、ポリエステル樹脂及びポリアミド樹脂の少なくとも一方により形成されている、項1に記載の電池用包装材料。
項3. 前記アルミニウム箔が、圧延方向に対して垂直方向の引張試験を行った時の0.2%耐力が共に55〜140N/mm2を満たす、項1または2に記載の電池用包装材料。
項4. 前記アルミニウム箔が、圧延方向に対して45°方向の引張試験を行った時の0.2%耐力が共に55〜140N/mm2を満たす、項1〜3のいずれかに記載の電池用包装材料。
項5. 前記金属層の少なくとも一方の面に化成処理が施されている、項1〜4のいずれかに記載の電池用包装材料。
項6. 二次電池用の包装材料である、項1〜5のいずれかに記載の電池用包装材料。
項7. 少なくとも正極、負極、及び電解質を備えた電池素子が、項1〜6のいずれかに記載の電池用包装材料内に収容されている、電池。
項8. 少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が55〜140N/mm2であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1:1〜1:3の範囲にある積層体の、電池用包装材料としての使用。
項9. 電池の製造方法であって、
少なくとも正極、負極、及び電解質を備えた電池素子を電池用包装材料で収容する工程を含み、
前記電池用包装材料として、
少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が55〜140N/mm2であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1:1〜1:3の範囲にあるものを用いる、電池の製造方法。
電池用包装材料は、図1に示すように、少なくとも、基材層1、接着層2、金属層3、及びシーラント層4が順次積層された積層体からなる。本発明の電池用包装材料において、基材層1が最外層になり、シーラント層4は最内層になる。即ち、電池の組み立て時に、電池素子の周縁に位置するシーラント層4同士が熱溶着して電池素子を密封することにより、電池素子が封止される。
[基材層1]
本発明の電池用包装材料において、基材層1は最外層を形成する層である。基材層1を形成する素材については、絶縁性を備えるものであることを限度として特に制限されるものではない。基材層1を形成する素材としては、例えば、ポリエステル樹脂、ポリアミド樹脂、エポキシ樹脂、アクリル樹脂、フッ素樹脂、ポリウレタン樹脂、珪素樹脂、フェノール樹脂、及びこれらの混合物や共重合物等の樹脂フィルムが挙げられる。これらの中でも、好ましくはポリエステル樹脂、ポリアミド樹脂が挙げられ、より好ましくは2軸延伸ポリエステル樹脂、2軸延伸ポリアミド樹脂が挙げられる。ポリエステル樹脂としては、具体的には、ポリエチレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレート、ポリブチレンナフタレート、共重合ポリエステル、ポリカーボネート等が挙げられる。また、ポリアミド樹脂としては、具体的には、ナイロン6、ナイロン6,6、ナイロン6とナイロン6,6との共重合体、ナイロン6,10、ポリメタキシリレンアジパミド(MXD6)等が挙げられる。
本発明の電池用包装材料において、接着層2は、基材層1と金属層3を強固に接着させるために、これらの間に設けられる層である。
本発明の電池用包装材料において、金属層3は、包装材料の強度向上の他、電池内部に水蒸気、酸素、光等が侵入するのを防止するためのバリア層として機能する層である。本発明の電池用包装材料において、金属層3は、圧延方向に対して平行方向(MD)の引張試験を行った時の0.2%耐力が55〜140N/mm2であるアルミニウム箔によって形成される。本発明においては、このように耐力が高いアルミニウム箔を金属層3として使用し、かつ、基材層1と金属層3の厚みとの比を1:1〜1:3の範囲に設定することにより、電池用包装材料の成形時における金属層3の伸びが基材層1によって適切に制御され、金属層3が部分的に薄くなることを効果的に抑制することができる。したがって、電池用包装材料に優れた成形性を備えさせることができる。なお、基材層1に対して金属層3の厚さが大き過ぎると、電池用包装材料の成形時に金属層3が伸ばされやすくなり、金属層3が部分的に薄くなってピンホールを生じやすくなる。また、基材層1に対して金属層3の厚みが小さ過ぎると、電池用包装材料の成形時に金属層3が伸ばされにくくなり、成形性が低下する。
本発明の電池用包装材料において、シーラント層4は、最内層に該当し、電池の組み立て時にシーラント層同士が熱溶着して電池素子を密封する層である。
本発明の電池用包装材料において、接着層5は、金属層3とシーラント層4を強固に接着させために、これらの間に必要に応じて設けられる層である。
本発明の電池用包装材料の製造方法については、所定の組成の各層を積層させた積層体が得られる限り、特に制限されないが、例えば、以下の方法が例示される。
本発明の電池用包装材料は、正極、負極、電解質等の電池素子を密封して収容するための包装材料として使用される。
<電池用包装材料の製造>
基材層1/接着層2/金属層3が順に積層された積層体に対して、サーマルラミネート法で接着層5及びシーラント層4を積層させることにより、基材層1/接着層2/金属層3/接着層5/シーラント層4が順に積層された積層体からなる電池用包装材料を製造した。電池用包装材料の製造条件は、以下に示す通りである。
上記で得られた電池用包装材料を裁断して、120×80mmの短冊片を作製し、これを試験サンプルとした。30×50mmの矩形状の雄型とこの雄型とのクリアランスが0.5mmの雌型からなるストレート金型を用い、雄型側に熱接着性樹脂層側が位置するように雌型上に上記試験サンプルを載置し、成形深さ6mm又は7mmとなるように当該試験サンプルを0.1MPaの押え圧(面圧)で押えて、冷間成形(引き込み1段成形)した。成形された電池用包装材料における金属層のピンホール及びクラックの発生の有無を確認し、ピンホール及びクラックの発生率(%)を算出した。ピンホール及びクラックの発生率は、上記成形を行った後に1カ所でもピンホール又はクラックが認められるものを成形不良品として判別し、30個の試験サンプルを上記条件で成形した際に発生した成形不良品の割合として求めた。結果を表4に示す。
2 接着層
3 金属層
4 シーラント層
5 接着層
Claims (13)
- 少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が65〜140N/mm2 であり、かつ、圧延方向に対して平行方向の引張試験を行った時の引張破断強度が90〜110N/mm 2 であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1.0:1.1〜1.0:2.7の範囲にある、電池用包装材料。 - 少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が65〜90N/mm2 であり、かつ、圧延方向に対して平行方向の引張試験を行った時の引張破断強度が90〜110N/mm 2 であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1:1〜1:3の範囲にある、電池用包装材料。 - 前記基材層が、ポリエステル樹脂及びポリアミド樹脂の少なくとも一方により形成されている、請求項1または2に記載の電池用包装材料。
- 前記基材層が、多層のポリアミド樹脂により形成されている、請求項1または2に記載の電池用包装材料。
- 前記アルミニウム箔が、圧延方向に対して垂直方向の引張試験を行った時の0.2%耐力が共に55〜140N/mm2を満たす、請求項1〜3のいずれかに記載の電池用包装材料。
- 前記アルミニウム箔が、圧延方向に対して45°方向の引張試験を行った時の0.2%耐力が共に55〜140N/mm2を満たす、請求項1〜5のいずれかに記載の電池用包装材料。
- 前記金属層の少なくとも一方の面に化成処理が施されている、請求項1〜6のいずれかに記載の電池用包装材料。
- 二次電池用の包装材料である、請求項1〜7のいずれかに記載の電池用包装材料。
- 少なくとも正極、負極、及び電解質を備えた電池素子が、請求項1〜8のいずれかに記載の電池用包装材料内に収容されている、電池。
- 少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が65〜140N/mm2 であり、かつ、圧延方向に対して平行方向の引張試験を行った時の引張破断強度が90〜110N/mm 2 であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1.0:1.1〜1.0:2.7の範囲にある積層体の、電池用包装材料としての使用。 - 少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が65〜90N/mm2 であり、かつ、圧延方向に対して平行方向の引張試験を行った時の引張破断強度が90〜110N/mm 2 であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1:1〜1:3の範囲にある積層体の、電池用包装材料としての使用。 - 電池の製造方法であって、
少なくとも正極、負極、及び電解質を備えた電池素子を電池用包装材料で収容する工程を含み、
前記電池用包装材料として、
少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が65〜140N/mm2 であり、かつ、圧延方向に対して平行方向の引張試験を行った時の引張破断強度が90〜110N/mm 2 であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1.0:1.1〜1.0:2.7の範囲にあるものを用いる、電池の製造方法。 - 電池の製造方法であって、
少なくとも正極、負極、及び電解質を備えた電池素子を電池用包装材料で収容する工程を含み、
前記電池用包装材料として、
少なくとも、基材層、接着層、金属層、及びシーラント層が順次積層された積層体からなり、
前記金属層が、圧延方向に対して平行方向の引張試験を行った時の0.2%耐力が65〜90N/mm2 であり、かつ、圧延方向に対して平行方向の引張試験を行った時の引張破断強度が90〜110N/mm 2 であるアルミニウム箔であり、
前記基材層と前記金属層との厚さの比(基材層の厚さ:金属層の厚さ)が1:1〜1:3の範囲にあるものを用いる、電池の製造方法。
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