JP6708979B2 - 蓄電デバイス用外装材 - Google Patents
蓄電デバイス用外装材 Download PDFInfo
- Publication number
- JP6708979B2 JP6708979B2 JP2017510049A JP2017510049A JP6708979B2 JP 6708979 B2 JP6708979 B2 JP 6708979B2 JP 2017510049 A JP2017510049 A JP 2017510049A JP 2017510049 A JP2017510049 A JP 2017510049A JP 6708979 B2 JP6708979 B2 JP 6708979B2
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- JP
- Japan
- Prior art keywords
- layer
- exterior material
- coating
- metal foil
- corrosion prevention
- 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.)
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Description
本発明の一実施形態に係る蓄電デバイス用外装材について説明する。図1は、本発明の一実施形態に係る蓄電デバイス用外装材(以下、単に「外装材10」と称する。)を示す概略断面図である。外装材10は、図1に示すように、バリア機能を発揮する金属箔層12と、金属箔層12の第一の面上に形成された被覆層11と、金属箔層12の上記第一の面とは反対側の第二の面上に形成された腐食防止処理層13と、腐食防止処理層13上に順次積層された接着層14及びシーラント層15を備えている。外装材10を用いて蓄電デバイスを形成する際は、被覆層11が最外層となり、シーラント層15が最内層となる。外装材10を構成する各層について、以下に詳細に説明する。
被覆層11は、蓄電デバイスを製造する際のヒートシールに対する耐熱性や、電解液が付着しても変質し難い電解液耐性を外装材10に付与するとともに、加工又は流通の際に起こり得るピンホールの発生を抑制する役割を果たす。
金属箔層12には、アルミニウム及びステンレス鋼等の各種金属箔を使用することができ、防湿性及び延展性等の加工性並びにコストの観点から、金属箔はアルミニウム箔であることが好ましい。アルミニウム箔としては、一般の軟質アルミニウム箔を用いることができる。中でも、耐ピンホール性及び成型時の延展性に優れる点から、鉄を含むアルミニウム箔が好ましく用いられる。
腐食防止処理層13は、電解液、又は電解液と水分の反応により発生するフッ酸による金属箔層12の腐食を抑制する役割を果たす。
接着層14は、腐食防止処理層13が形成された金属箔層12とシーラント層15とを接着する層である。外装材10は、接着層14を形成する接着成分によって、熱ラミネート構成とドライラミネート構成との大きく二つに分けられる。
シーラント層15は、外装材10においてヒートシールによる封止性を付与する層である。シーラント層15としては、ポリオレフィン系樹脂又はポリオレフィン系樹脂に無水マレイン酸等の酸をグラフト変性させた酸変性ポリオレフィン系樹脂からなる樹脂フィルムが挙げられるが、ヒートシール部の耐熱性やヒートシール強度が向上することから、ポリオレフィン系樹脂が好ましい。
被覆層11の単膜は、延伸ポリエステルフィルムなどの基材層に、ウレタン(メタ)アクリレートオリゴマーを含む活性エネルギー線硬化性樹脂組成物を塗布、乾燥し、活性エネルギー線を照射して架橋構造を形成した後、もしくは、フッ素系樹脂を含む樹脂材料を塗布、乾燥し、さらには熱処理を行うことで架橋構造を形成した後、もしくは、水に分散させたポリウレタン樹脂又はポリエステル樹脂を塗布、乾燥した後、基材層から剥離することで得られる。
以下、外装材の製造方法について、上記外装材10を例に説明する。下記内容は製造方法の一例であり、本実施形態の外装材の製造方法は下記の内容に限定されない。
外装材10の製造方法としては、例えば、下記工程S1〜S3を有する方法が挙げられる。
工程S1:金属箔層12の一方の面(第二の面)上に、腐食防止処理層13を形成する工程。
工程S2−1:金属箔層12の他方の面(第二の面と反対側の第一の面)上に、活性エネルギー線硬化性樹脂組成物を塗布、乾燥し、活性エネルギー線を照射して、被覆層11を形成する工程。塗布方法は特に限定されず、グラビアコート、リバースコート、ロールコート及びバーコート等の各種方法を採用できる。塗布後は、溶媒成分を乾燥して、例えば、積算光量500mJ/cm2で320nm以下の波長の紫外線を照射することで、被覆層11が形成される。なお、外装材20では、被覆層21は第一の腐食防止処理層22上に上記と同様に形成される。
工程S2−2:金属箔層12の他方の面(第二の面と反対側の第一の面)上に、フッ素系樹脂を塗布、乾燥して被覆層11を形成する工程。塗布方法は特に限定されず、グラビアコート、リバースコート、ロールコート、バーコート等、各種方法を採用できる。塗工後は、例えば60℃にて7日間のエージング処理で硬化促進を得ることができる。なお、外装材20では、被覆層21は第一の腐食防止処理層22上に上記と同様に形成される。
工程S3:金属箔層12の一方の面上に形成された腐食防止処理層13上に、接着層14を介してシーラント層15を貼り合わせる工程。なお、外装材20においてもこれに準じて工程が実施される。
工程S1では、金属箔層12の一方の面上に腐食防止処理剤を塗布し、乾燥することにより、腐食防止処理層13が形成される。腐食防止処理剤としては、例えば、上記したセリアゾール処理用の腐食防止処理剤及びクロメート処理用の腐食防止処理剤等が挙げられる。腐食防止処理剤の塗布方法は特に限定されず、グラビアコート、リバースコート、ロールコート及びバーコート等の各種方法を採用できる。なお、外装材20では、金属箔層23の両面に第一及び第二の腐食防止処理層が上記と同様に形成される。第一及び第二の腐食防止処理層の形成の順序は特に制限されない。
金属箔層の外側に基材層を積層する汎用の外装材の場合、接着層を介して積層することから、エージング等の工程が必要となる。しかし、被覆層11の形成には接着層を介する必要がなく、工程S2では、エージング等の工程が不要である。その結果、タクトタイムを短縮して、製造効率を著しく向上することができる。さらに、接着剤等を用いないことによりコストも大きく低減することができる。
工程S3では、被覆層11、金属箔層12及び腐食防止処理層13がこの順に積層された積層体の腐食防止処理層13上に接着層14を形成し、シーラント層15を形成する樹脂フィルムが貼り合わせられる。シーラント層15の積層は、サンドイッチラミネーションにより行うことが好ましい。なお、外装材20においてもこれに準じて工程が実施される。
実施例及び比較例で、外装材の、金属箔層、腐食防止処理層、接着層及びシーラント層に使用した材料を以下に示す。
金属箔:軟質アルミニウム箔8079材(東洋アルミニウム社製、厚さ:30μm)。
腐食防止処理剤:酸化セリウム、リン酸及びアクリル系樹脂を主として含む塗布型セリアゾール処理用の腐食防止処理剤。
接着樹脂:無水マレイン酸でグラフト変性したポリプロピレン系樹脂(商品名「アドマー」、三井化学社製(厚さ10μm〜20μm)。
シーラント樹脂:押出し成形にて製膜したポリプロピレンフィルム(厚さ10μm〜60μm)。
実施例及び比較例の被覆層として使用した材料及びシーラント層を以下に示す。なお、得られた被覆層等の10%引張強度は、引張試験(JIS K 7127(旧規格JIS K 7113−2)に準拠:測定環境23℃、50%RH、試料幅6mm、標線間距離35mm、引張速度50mm/分)により測定した。
(実施例1〜3、比較例1〜2)
テトラフルオロエチレン・ビニル共重合樹脂の主剤に対して、表1に示したイソシアネート系硬化剤をそれぞれOH/NCO=1となるモル比で配合した。前記樹脂を、金属箔層の第一の面に塗工し、100℃で5分間乾燥した。塗工後、架橋構造を得るべく60℃にて7日間のエージング処理を行い、被覆層を形成した。
表1に示したウレタン(メタ)アクリレートオリゴマーに対して、1−ヒドロキシ−シクロヘキシル−フェニル−ケトン(BASF社製、商品名:イルガキュアー184)を、固形分比5質量%で添加して、活性エネルギー線硬化性樹脂組成物を得た。金属箔層の片面(第二の面)にセリアゾール処理用の腐食防止処理剤を塗布し、腐食防止処理層を形成した。活性エネルギー線硬化性樹脂組成物を、金属箔の腐食防止処理層を形成していない面(第一の面)上にバーコーターを用いて塗布し、100℃で5分間加熱乾燥し、被覆層を形成した。
水に分散したポリウレタン又はポリエステルを、金属箔の腐食防止処理層を形成していない面(第一の面)上にバーコーターを用いて塗布し、150℃で5分間加熱乾燥し、被覆層を形成した。
(成型性)
実施例及び比較例で得られた外装材を、150mm×190mmのブランク形状に切り取り、室温23℃、露点温度−35℃の成型環境下で成型深さを変化させながら冷間成型した。成型には、外装材と平行な面において100mm×150mmの形状を有し、1.5mmのパンチコーナーラジアス(Rcp)、0.75mmのパンチ肩ラジアス(Rp)を有するパンチ金型と、0.75mmのダイ肩ラジアス(Rd)を有するダイ金型を使用した。下記基準に従って成型性を評価した。評価結果を表2に示す。
「A」:破断又はクラックを生じさせずに、成型深さ4mm以上の深絞り成型が可能である。
「B」:破断又はクラックを生じさせずに、成型深さ3mm以上4mm未満の深絞り成型が可能である。
「C」:成型深さ3mm未満の深絞り成型で破断又はクラックが生じる。
実施例及び比較例で得られた外装材を、120mm×260mmの形状に切り取り、シーラント層が上方を向くように成型装置内に配置した。成型装置の成型深さを3mmに設定し、室温23℃露点温度−35℃の環境下で、冷間成型を行った。パンチ金型には、70mm×80mmの長方形の横断面を有し、底面に0.75mmのパンチラジアス(RP)を有し、側面に1.5mmのパンチコーナーラジアス(RCP)を有するものを使用した。また、ダイ金型には、開口部上面に0.75mmのダイラジアス(RD)を有するものを使用した。パンチ金型とダイ金型との間のクリアランス0.20mmとした。成型エリアは切り取った外装材の長手方向の略中央で分けた半面の略中央とした。すなわち、成型エリアの両端が、切り取った外装材の短手方向の両端からそれぞれ25mmの位置となるように、成型エリアを配置した。成型加工された外装材を、反り上がる層側を上面にして、室温23℃、露点温度−35℃の環境に60分静置させ、成型されていないエリアの端辺の反り量(静置面からの距離)を測定した。反り量の測定結果を表2に示す。
実施例及び比較例で得られた外装材の被覆層(又は基材層)側表面に、微量の水(1500ppm)を添加した電解液(溶媒:エチレンカーボネート/ジメチルカーボネート/ジエチルカーボネート=1/1/1、電解質:LiPF6(濃度1M))を滴下した。24時間放置後、滴下した電解液をイソプロピルアルコールで拭き取った。その後、外装材の滴下箇所の外観を下記基準に従って評価した。評価結果を表2に示す。
「A」:電解液を滴下した箇所が視認できない。
「B」:電解液を滴下した箇所に輪郭は視認できるが、溶解等の損傷を受けていない。
「C」:電解液を滴下した箇所が電解液により溶解等の損傷を受けている。
Claims (4)
- 金属箔層と、
前記金属箔層の第一の面上に、直接又は第一の腐食防止処理層を介して形成された被覆層と、
前記金属箔層の第二の面上に形成された第二の腐食防止処理層と、
前記第二の腐食防止処理層上に形成された接着層と、
前記接着層上に形成されたシーラント層と、
を備え、
前記被覆層がフッ素系樹脂及びウレタン系樹脂からなる群より選択される少なくとも一種を含み、
前記フッ素系樹脂が、イソシアネート系硬化剤により硬化された四フッ化型のフッ素樹脂であり、前記硬化剤1分子内のNCO官能基当量が1000〜5000であり、
前記ウレタン系樹脂が、1分子内の(メタ)アクリロイル基の官能基当量が1000〜5000であるウレタン(メタ)アクリレートオリゴマーを用いて得られるものであり、
引張試験(JIS K 7127に準拠)における、前記被覆層と、前記接着層及び前記シーラント層の積層体と、の10%延伸時における強度差が0.400N/mm未満である、
蓄電デバイス用外装材。 - 前記被覆層の厚さが3〜30μmである、請求項1記載の蓄電デバイス用外装材。
- 前記シーラント層がポリオレフィン系樹脂からなる、請求項1又は2記載の蓄電デバイス用外装材。
- 前記被覆層の厚さに対する、前記接着層及び前記シーラント層の合計厚さが2〜8倍である、請求項1〜3のいずれか一項記載の蓄電デバイス用外装材。
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JP6287236B2 (ja) * | 2014-01-16 | 2018-03-07 | 凸版印刷株式会社 | 蓄電デバイス用外装材 |
TWI499504B (zh) * | 2014-01-29 | 2015-09-11 | Benq Materials Corp | 電池包裝膜 |
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CN205705574U (zh) * | 2015-03-30 | 2016-11-23 | 凸版印刷株式会社 | 蓄电设备用外装构件 |
WO2016175091A1 (ja) * | 2015-04-28 | 2016-11-03 | 凸版印刷株式会社 | 蓄電デバイス用外装材 |
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KR20170131513A (ko) | 2017-11-29 |
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US10319958B2 (en) | 2019-06-11 |
US20180019449A1 (en) | 2018-01-18 |
CN205705574U (zh) | 2016-11-23 |
CN106003915A (zh) | 2016-10-12 |
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