JP6312749B2 - 熱伝導性接着剤及び該熱伝導性接着剤を含む二次電池 - Google Patents
熱伝導性接着剤及び該熱伝導性接着剤を含む二次電池 Download PDFInfo
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- JP6312749B2 JP6312749B2 JP2016131366A JP2016131366A JP6312749B2 JP 6312749 B2 JP6312749 B2 JP 6312749B2 JP 2016131366 A JP2016131366 A JP 2016131366A JP 2016131366 A JP2016131366 A JP 2016131366A JP 6312749 B2 JP6312749 B2 JP 6312749B2
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- Prior art keywords
- conductive adhesive
- heat conductive
- adhesive
- thermally conductive
- filler
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
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- C—CHEMISTRY; METALLURGY
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Description
本願に係る第2の発明は、該熱伝導性接着剤の応用を提供することを目的とする。
本願に係る第3の発明は、該熱伝導性接着剤を含むリチウムイオン電池を提供することを目的とする。
本願に係る第4の発明は、該リチウムイオン電池の製造方法を提供することを目的とする。
1.本発明において、ホットメルト接着剤体系に熱伝導性フィラーを添加することにより、熱伝導性接着剤が製造され、該熱伝導性接着剤は良好な熱伝導性能を有し、好ましくは、熱伝導性接着剤は、熱伝導係数が0.1〜100W/mKの範囲にあり、これにより、セルの熱を迅速に保護素子に伝導し、保護素子の温度をセル内の温度と同期させることができるとともに、保護素子を迅速に切断させてセルを保護し、過充電時の安全性を改善する。
2.本発明に係る熱伝導性接着剤は初期粘着力が強く、その強い接着性により、保護素子とセルを安定的に接触させることができ、これにより、セルが不適切な使用状況で膨張したり、変形したりする時に、熱伝導性接着剤がセル表面から脱落することを回避することができる。
3.本発明に係る熱伝導性接着剤は、スプレー塗装プロセスを用いて、それをセルにおける、保護素子が設けられた箇所にスプレーすることにより、保護素子を電池と安定的に接着させることができ、これにより、一定の量で所定の位置に接着剤を塗布することができる。さらに、本発明に係る熱伝導性接着剤は、初期粘着力が強いため、生産効率を向上させ、量産プロセスが一貫し、信頼性が高い、量産プロセスの要求を満たすことができる。
HDPE粉末ホットメルト接着剤は、結晶度が高い、非極性の熱可塑性樹脂であり、LDPE粉末ホットメルト接着剤は、溶融温度が低い、溶融後の流動性が良い。
1.ホットメルト接着剤の自己架橋の化学反応
<実施例1〜9>
Claims (12)
- 二次電池に用いられる熱伝導性接着剤であって、前記熱伝導性接着剤はホットメルト接着剤と熱伝導性フィラーを含み、
前記ホットメルト接着剤はポリウレタンホットメルト接着剤を含み、
前記ポリウレタンホットメルト接着剤はイソシアネート基含有ウレタンプレポリマーより選ばれることを特徴とする熱伝導性接着剤。 - 前記熱伝導性フィラーは、金属、金属酸化物、炭素材料、窒化物、炭化物、シリコン材料からなる群より選ばれる少なくとも1種であることを特徴とする請求項1に記載の熱伝導性接着剤。
- 前記熱伝導性フィラーの熱伝導係数は、1W/mK〜10000W/mKであることを特徴とする請求項1に記載の熱伝導性接着剤。
- 前記熱伝導性フィラーの熱伝導係数は、20W/mK〜6000W/mKであることを特徴とする請求項3に記載の熱伝導性接着剤。
- 前記熱伝導性フィラーの粒径は1nm〜100μmであり、又は、前記熱伝導性フィラーに粒径が1nm以上、且つ1μm未満である熱伝導性フィラー粒子と、粒径が1μm以上、且つ50μm以下である熱伝導性フィラー粒子が含まれており、前記粒径はフィラーのメジアン径であることを特徴とする請求項1に記載の熱伝導性接着剤。
- 前記熱伝導性フィラーが前記熱伝導性接着剤を占める質量百分率は、1%〜99%であることを特徴とする請求項1に記載の熱伝導性接着剤。
- 前記熱伝導性接着剤の熱伝導係数は、0.1W/mK〜10000W/mKであることを特徴とする請求項1〜6のいずれか一つに記載の熱伝導性接着剤。
- 前記熱伝導性接着剤の熱伝導係数は、0.1W/mK〜100W/mKであることを特徴とする請求項7に記載の熱伝導性接着剤。
- 請求項1〜8のいずれか一つに記載の熱伝導性接着剤の二次電池への応用。
- セル、セルに固定された安全部材、及びセルと安全部材との間に位置する熱伝導性接着剤を含む二次電池であって、前記熱伝導性接着剤は請求項1〜8のいずれか一つに記載の熱伝導性接着剤であることを特徴とする二次電池。
- 前記熱伝導性接着剤は、面積が1mm2〜500mm2であり、前記熱伝導性接着剤は、厚さが0.01〜10mmであることを特徴とする請求項10に記載の二次電池。
- 請求項10に記載の二次電池の製造方法であって、前記製造方法は、安全部材に前記熱伝導性接着剤を付加する、又はセルに前記熱伝導性接着剤を付加するステップと、安全部材とセルとが安定的に接着されるように、0.1〜100Nの圧力を印加するステップとを含むことを特徴とする製造方法。
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