JPWO2019097877A1 - 樹脂成形体およびタブリード - Google Patents
樹脂成形体およびタブリード Download PDFInfo
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- JPWO2019097877A1 JPWO2019097877A1 JP2019553729A JP2019553729A JPWO2019097877A1 JP WO2019097877 A1 JPWO2019097877 A1 JP WO2019097877A1 JP 2019553729 A JP2019553729 A JP 2019553729A JP 2019553729 A JP2019553729 A JP 2019553729A JP WO2019097877 A1 JPWO2019097877 A1 JP WO2019097877A1
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- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
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- H—ELECTRICITY
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
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Abstract
Description
腐食性を有する酸の存在下においては、金属が腐食して問題が生じる場合がある。例えば特許文献1及び2のような電池においては、封入袋とリード導体との間に樹脂成形体を配置して封入袋とリード導体との間に生じる空間を封止することにより封入袋の密封性が大幅に向上する。しかしながら、そのように密封したとしても封入袋内部への水分の侵入を完全に防止することは困難である。封入袋内部に水分が侵入すると、その水分は封入袋内部に封入された電解液と反応して、腐食性の酸であるフッ化水素酸が生成する。このフッ化水素酸は金属からなるリード導体を腐食する。リード導体が腐食すると、リード導体から樹脂成形体が剥離して封入袋の密封性が減少し、封入袋内部に封入された電解液が外部に漏れるおそれもある。このように、腐食性を有する酸性の液体による金属の腐食を抑制することが求められる。
[本開示の効果]
[本開示の実施形態の説明]
次に、図面を参照しつつ本開示にかかる樹脂成形体およびタブリードの一実施の形態を以下に説明する。
リード導体1は、例えば、アルミニウム(Al)、ニッケル(Ni)、アルミニウム合金、ニッケル合金またはニッケルめっき銅、あるいはニッケルクラッド銅などで形成される。なお、リチウムイオン電池やリチウムイオンキャパシタでは、正極側のリード導体にはアルミニウムやアルミニウム合金が使用され、負極側のリード導体にはニッケルやニッケル合金、ニッケルめっきを施した銅などが使用される。
このようなリード導体1は、例えば厚さが0.05mm以上1.0mm以下の金属箔を所定の大きさにカットすることにより作製することができる。
樹脂部2は、リード導体1の長手方向の両端部を含む領域を除く、長手方向の一部の領域の外周側を覆うように配置される。リード導体1の長手方向の両端部は、電極や端子などの導電部位と電気的に接続されるため、樹脂部2が形成されず露出された状態である。
樹脂部2は、上記両端部以外の一部の領域において、その外周側を覆うように配置される。樹脂部2は、例えば2枚の樹脂フィルム(樹脂成形体に相当)21,22を、リード導体1を挟むようにして互いに貼り合わせることにより形成される。樹脂フィルム21,22の幅はリード導体1の幅よりも広く、これにより封止性を高めている。例えば樹脂フィルム21,22としては、厚みが例えば30μm以上200μm以下、長さが例えば2mm以上10mm以下、幅が例えば3mm以上110mm以下といった寸法を有するものが用いられる。
樹脂成分はポリオレフィン樹脂に酸含有基が導入された酸基含有ポリオレフィン樹脂を含有する。ポリオレフィン樹脂とは、ラジカル重合性不飽和二重結合を有するオレフィン系単量体を重合又は共重合させてなる合成樹脂である。オレフィン系単量体としては、特に限定されず、例えば、エチレン、プロピレン、1−ブテン、1−ペンテン、1−ヘキセン、1−ヘプテン、1−オクテン、4−メチル−1−ペンテンなどのα−オレフィンや、ブタジエン、イソプレンなどの共役ジエンなどが挙げられる。オレフィン系単量体は、単独で用いられても二種以上が併用されてもよい。
上記樹脂組成物は受酸剤を含む。受酸剤はマグネシウムおよびカルシウムの少なくともいずれか一方を含有する無機化合物である。
樹脂フィルム21,22を形成するための樹脂組成物は、上記酸基含有ポリオレフィン樹脂を含有する樹脂成分からなるマトリクス15に上記受酸剤の粒子25が分散された分散体である。樹脂組成物は、未硬化の樹脂成分に上記受酸剤を添加し、混合することにより調製される。
本実施の形態にかかるタブリード20は、帯状のリード導体1と、リード導体1の長手方向の両端部を除く、長手方向の一部の領域の外周側を覆うように配置された樹脂成形体(樹脂フィルム21,22)からなる樹脂部2と、を備える。樹脂成形体である樹脂フィルム21,22は、上記樹脂組成物からなる樹脂成形体である。
次に、図3〜図6を参照して、上記タブリード20が封入袋型の非水電解質電池100に適用された例について説明する。
(樹脂成分)
・MAH−PP1 (比重0.89、融点135℃、無水マレイン酸変性r−PP(r−PPは再生ポリプロピレン(polypropylene))、酸含有量0.8wt%)
・MAH−PP2 (融点135℃、無水マレイン酸変性r−PP、酸含有量2wt%)
・PP1(比重0.9、引張弾性率1050MPa、融点140℃のr−PP)
・VLDPE(比重0.868、融点55℃のVLDPE(Very Low Density Polyethylene))
・EMAA(エチレン・メタアクリル酸共重合樹脂、融点88℃、比重0.94、この樹脂単独での酸含有量8wt%)
・水酸化マグネシウム(平均粒径2.9μm、比表面積3.3m2/g、未処理)
・ハイドロタルサイト(平均粒径0.5μm、比表面積10m2/g、ステアリン酸処理)
・酸化マグネシウム1(平均粒径0.5μm、比表面積145m2/g、未処理)
・酸化マグネシウム2(平均粒径0.5μm、比表面積25m2/g、未処理)
・酸化マグネシウム3(比較用無機粒子、平均粒径6μm、比表面積145m2/g、未処理)
・炭酸カルシウム1(平均粒径2.2μm、比表面積1.0m2/g、未処理)
・炭酸カルシウム2(比較用無機粒子、平均粒径8μm、比表面積0.27m2/g、未処理)
・酸化亜鉛(比較用無機粒子、平均粒径1μm)
表1から表3に示す配合(単位は質量部)に基づいて、樹脂組成物を調製した。得られた各樹脂組成物をフィルム状に押出成形することにより厚み50μmの樹脂フィルム21,22のサンプルを作製した。作製した樹脂フィルム21,22に対し、成形性(成形の可否)、フィルム外観(凝集物の有無など)、および走査型電子顕微鏡(SEM)による表面観察を行った。結果を表1から表3に示す。
2 樹脂部
2a,2b 樹脂部
4 封止部
5 電極
5a 正極
5b 負極
6 セパレータ
7 外側層
8 内側層
9 金属層
11 封入袋
15 マトリクス
20 タブリード
20a,20b タブリード
21 樹脂フィルム
22 樹脂フィルム
25 粒子
30 組立体
100 非水電解質電池
Claims (11)
- 酸基含有ポリオレフィン樹脂を含有する樹脂成分と、
粒径が5μm以下であり、マグネシウムおよびカルシウムの少なくともいずれか一方を含有する、前記樹脂成分100質量部当たり1質量部以上20質量部以下の受酸剤と、
を含有する樹脂組成物からなり、
前記樹脂成分が0.05質量%以上5質量%以下の酸基含有部位を含む、樹脂成形体。 - フィルム状の形状を有する、請求項1に記載の樹脂成形体。
- 前記酸基含有部位がカルボン酸基を含有する、請求項1又は請求項2に記載の樹脂成形体。
- 前記受酸剤が、水酸化マグネシウム、ハイドロタルサイト、酸化マグネシウム、および炭酸カルシウムからなる群から選択される少なくとも1種の無機化合物である請求項1〜請求項3のいずれか1項に記載の樹脂成形体。
- 前記酸基含有ポリオレフィン樹脂が、無水マレイン酸変性ポリプロピレン、およびポリプロピレンとエチレン−メタアクリル酸共重合体との組合せのうち少なくともいずれか一方を含む請求項1〜請求項4のいずれか1項に記載の樹脂成形体。
- 電池の電源取り出し部封止用材料として使用される請求項1〜請求項5のいずれか1項に記載の樹脂成形体。
- 無水マレイン酸変性ポリプロピレンを含有する樹脂成分と、
粒径が3μm以下の酸化マグネシウムを含有する、前記樹脂成分100質量部当たり1質量部以上20質量部以下の受酸剤と、
を含有する樹脂組成物からなり、
前記樹脂成分が0.5質量%以上3質量%以下の酸基含有部位を含む、請求項1に記載の樹脂成形体。 - 帯状のリード導体と、
前記リード導体の長手方向の両端部を含む領域を除く、前記長手方向の一部の領域の外周側を覆うように配置された樹脂成形体からなる樹脂部と、を備え、
前記樹脂成形体は、請求項1〜7のいずれか1項に記載の樹脂成形体である、
タブリード。 - 前記リード導体が、アルミニウム、ニッケル、アルミニウム合金、およびニッケル合金から選択される少なくとも1種からなる、請求項8記載のタブリード。
- 前記リード導体が表面未処理アルミニウム導体である、請求項8又は請求項9に記載のタブリード。
- 前記リード導体を構成する金属に前記樹脂部が直接接触するように前記樹脂部が配置された、請求項8〜請求項10のいずれか1項に記載のタブリード。
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