JPWO2011089965A1 - シート状二次電池及びその製造方法 - Google Patents
シート状二次電池及びその製造方法 Download PDFInfo
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Abstract
Description
上記実施例、比較例1及び比較例2のシート状二次電池をそれぞれ4個ずつ作製し、電極端子3a,3bとラミネート外装体2の金属層2bとの間に、所定の電圧(0.1kV)を印加し、所定の時間(5msec)経過した後の保持電圧を測定した。ここで、所定の時間経過後に、印加電圧(0.1kV)が保持されているほど(保持電圧が高いほど)、絶縁性が良好なものとして評価した。
次に、実施例及び比較例1,2のシート状二次電池について、シール前の樹脂の総厚さとシール後の樹脂の総厚さとを測定して比較評価した。具体的には、シール前の総厚さ(接合用樹脂5の厚さと内面樹脂層2aの厚さとを加えた総厚さ)を100%としたとき、図9に模式的に示すように、シール後の余剰樹脂収容部20aにおける平坦部20a0の厚さd0及び凸部20a1の厚さd1のシール前の総厚さに対する割合(%)を測定して比較評価した。測定結果を表3に示す。
次に、実施例、比較例2のシート状二次電池について、合計1100個生産時のシール不良発生率及び絶縁不良発生率を比較評価した。なお、比較評価に当たっては、電池製作から所定の時間(例えば、24H)経過後、ヒートシール部20に液漏れ等が生じた場合には、シール不良と判定し、電極端子3a,3bとラミネート外装体2間の絶縁抵抗値が50MΩ以下の場合には、絶縁不良と判定した。評価結果を表4に示す。
Claims (14)
- ヒートシール可能な熱可塑性樹脂製の内面層と金属層とを有する可撓性のラミネート外装体と、
前記ラミネート外装体の周辺に形成されたヒートシール部により、当該ラミネート外装体の内部に密封状態に収容され、シート状の正電極及びシート状の負電極がセパレータを介して交互に積層形成された内部電極対と、
前記内部電極対と電気的に連結され、前記ラミネート外装体のヒートシール部を気密に貫通して外部に引き出される電極端子と
を備え、
前記電極端子が介在するヒートシール部では、前記ラミネート外装体と前記電極端子とが接合用樹脂を介して接合されていると共に、前記電極端子と対峙する前記ラミネート外装体の内面層に、ヒートシールの際に余剰となった樹脂を収容する余剰樹脂収容部が形成されているのに対し、前記ラミネート外装体の内面層同士が接合するヒートシール部には、前記余剰樹脂収容部が形成されていないことを特徴とするシート状二次電池。 - 前記余剰樹脂収容部は、前記電極端子が介在するヒートシール部において、シール後の接合用樹脂の厚さとラミネート外装体の内面層との厚さとを加えた総厚さが、シール前の総厚さの65〜90%となるように、その形成位置が設定されていることを特徴とする請求項1に記載のシート状二次電池。
- 前記余剰樹脂収容部は、ラミネート外装体の内面層同士を接合する通常のヒートシール部を基準にして、その形成位置が設定されていることを特徴とする請求項2に記載のシート状二次電池。
- 前記余剰樹脂収容部は、ラミネート外装体の表面から突出するように形成されていることを特徴とする請求項1ないし3のいずれかに記載のシート状二次電池。
- 前記接合用樹脂は、ラミネート外装体の内面層と同様な材質であって架橋構造を有する熱可塑性樹脂であることを特徴とする請求項1ないし4のいずれかに記載のシート状二次電池。
- 前記電極端子は、その厚さが0.2〜5.0mmであり、ヒートシール部に沿った長さが16〜100mmの板状の端子であることを特徴とする請求項1ないし5のいずれかに記載のシート状二次電池。
- 前記シート状二次電池は、その容量が1.5Ah以上であることを特徴とする請求項1ないし6のいずれかに記載のシート状二次電池。
- ヒートシール可能な熱可塑性樹脂製の内面層と金属層とを有する可撓性のラミネート外装体の内部に、シート状の正電極及びシート状の負電極をセパレータを介して交互に積層した内部電極対を収容したシート状二次電池の製造方法であって、
所定の形状の窪みを有する一対のシール治具を用い、
前記内部電極対と接続された電極端子の表面を粗面化処理した後、当該表面と接合可能な熱可塑性の接合用樹脂を塗布し、電極端子及びその表面の接合用樹脂を介してラミネート外装体をヒートシールする際に、前記一対のシール治具により電極端子が突出したラミネート外装体のヒートシール部を挟み込んで加熱加圧し、前記電極端子が介在するヒートシール部には、ヒートシールの際に余剰となった樹脂を収容する余剰樹脂収容部をラミネート外装体の内面層に形成する一方、ラミネート外装体の内面層同士が接合するヒートシール部には、前記余剰樹脂収容部を形成しないことを特徴とするシート状二次電池の製造方法。 - 前記余剰樹脂収容部は、シール後の接合用樹脂の厚さとラミネート外装体の内面層との厚さとを加えた総厚さが、シール前の総厚さの65〜90%となるように、その形成位置が設定されていることを特徴とする請求項8に記載のシート状二次電池。
- 前記シール治具は、ラミネート外装体の内面層同士を接合する通常のヒートシール部を加熱加圧する平坦な基準シール面と、ラミネート外装体の電極端子に対峙するヒートシール部を加熱加圧して余剰樹脂収容部を形成する収容部形成面とを有し、前記余剰樹脂収容部は、前記平坦な基準シール面に基づいて、前記形成位置が設定されることを特徴とする請求項9に記載のシート状二次電池の製造方法。
- 前記余剰樹脂収容部は、ラミネート外装体の外表面から突出するように形成されていることを特徴とする請求項8ないし10のいずれかに記載のシート状二次電池の製造方法。
- 前記接合用樹脂は、ラミネート外装体の内面層と同様な材質であって架橋構造を有する熱可塑性樹脂であることを特徴とする請求項8ないし11のいずれかに記載のシート状二次電池の製造方法。
- 前記電極端子は、その厚さが0.2〜5.0mmであり、ヒートシール部に沿った長さが16〜100mmの板状の端子であることを特徴とする請求項8ないし12のいずれかに記載のシート状二次電池の製造方法。
- 前記シート状二次電池は、その容量が1.5Ah以上であることを特徴とする請求項8ないし13のいずれかに記載のシート状二次電池。
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