JP6690831B2 - 二次電池 - Google Patents
二次電池 Download PDFInfo
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- JP6690831B2 JP6690831B2 JP2015215827A JP2015215827A JP6690831B2 JP 6690831 B2 JP6690831 B2 JP 6690831B2 JP 2015215827 A JP2015215827 A JP 2015215827A JP 2015215827 A JP2015215827 A JP 2015215827A JP 6690831 B2 JP6690831 B2 JP 6690831B2
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Description
二次電池を製作するのに重要なことの一つがエネルギー密度である。特に小型電子機器に利用される二次電池は、電子機器内に挿入されて電源として利用されている。
しかし、可撓性二次電池は、反復的なベンディング動作に露出されることになり、パウチ型二次電池の構造でベンディング応力(bending stress)を印加する場合、結合力の弱い部分で破損が起るという問題点が発生する。
また、本発明の他の目的は、容量が増加した可撓性二次電池を提供することにある。
前記第1電極の無地部と前記第2部分は接着剤で付着して固定され、前記第2電極の無地部と前記第3部分は接着剤で付着して固定されてもよい。
露出した前記第1電極と電気的に連結されている第1電極タップと、前記第2部分の切開部を通じて露出した前記第2電極と電気的に連結されている第2電極タップと、をさらに含んでもよい。
前記電極組立体の一端と前記ケースの内面との間に設定され、曲がる前記電極組立体の自由端で長さ変化を収容するマージン部を含んでもよい。
前記ケースは、前記電極組立体の両面に配置される第1外装材と第2外装材をさらに含んでもよい。
前記第1電極および前記第2電極は、それぞれポリマーシートからなってもよい。
また、コーティング部に固定部が形成されないことにより、二次電池の容量が増加した二次電池を提供することができる。
図1および図2に示したように、本発明の一実施形態にかかる二次電池は、電極組立体110と、電極組立体110を内蔵するケース(一例として、以下では「パウチ」120と称する)と、電極組立体110とパウチ120の内面との間に設定されて曲がる電極組立体110の長さ変化を収容するマージン部130と、を含む。
図2および図3を参照すれば、電極組立体110は、セパレータ13を間において第1電極11と第2電極12を積層配置して積層形からなる。セパレータ13は、リチウムイオンを通過させるポリマーフイルムから形成されることができる。
固定部18は、第1電極11の無地部11bとセパレータ13と第2電極12の無地部12bとを接着剤で付着して形成される。例えば、無地部11bに対応するセパレータ13に接着剤を塗布して第1電極11の無地部11bを付着した後、無地部11bに接着剤を塗布してセパレータ13を付着し、無地部12bに対応するセパレータ13に接着剤を塗布して第2電極12の無地部12bを付着した後、無地部12bに接着剤を塗布してセパレータ13を付着する工程の繰り返しで固定部18を形成することができる。
本実施形態において、固定部18は無地部11b、12bに備えられるので、マージン部130の反対側に位置する。
本発明では、固定部が無地部に形成されることによって第1電極および第2電極のコーティング部全体を活性領域として使用できるので、二次電池の容量を増加させることができる。
第1外装材201および第2外装材202は、同一層構造のポリマーシート121、ナイロンシート122および金属シート123で形成されることができる。図示しなかったが、第1外装材および第2外装材は、ガスケット(gasket)を介在して密封することができる。
図4を参照すれば、本発明の一実施形態の二次電池は、マージン部130を第1、第2電極タップ14、15の反対側に備えて、曲がる電極組立体110の長さ変化を収容する。
例えば、電極組立体110は、特性長さ(L)と厚さ(t)および許容曲率半径(R)を有する。特性長さ(L)は、電極組立体110のx軸方向全体長さから固定部18を除いた電極組立体110の残りの長さを意味する。つまり、特性長さ(L)は、電極組立体110がベンディング応力を受けるとき、直接スリップを起こして曲がることができる部分を意味する。
ベンディング応力の作用によって長さが増加し、増加した長さをマージン部130で収容することによって電極組立体110および二次電池は、ベンディング応力に相応する程度に曲がることができる。従って、二次電池が曲がるとき、二次電池で破断が発生せず、内部短絡(short-circuit)が発生しない。
11a、12a:コーティング部
11b、12b:無地部
13:セパレータ
14、15:第1、第2電極タップ
16、17:絶縁部材
18:固定部
110:電極組立体
120:ケース(パウチ)
121:ポリマーシート
122:ナイロンシート
123:金属シート
130:マージン部
131:セパレータの第2部分
132:セパレータの第3部分
201、202:第1、第2外装材
Claims (9)
- 無地部とコーティング部をそれぞれ有してセパレータを間において反復積層されている第1電極および第2電極からなる電極組立体と、
可撓性を有して前記電極組立体を収容するケースと、を含み、
前記電極組立体は、前記無地部に前記セパレータが付着して固定された固定部を含み、
前記セパレータは、前記コーティング部と対応する第1部分と、
前記第1電極の無地部と対応し、前記第1電極の無地部のいずれか1つの角を露出する切開部を有する第2部分と、
前記第2電極の無地部と対応し、前記第2電極の無地部のいずれか1つの角を露出する切開部を有する第3部分と、を含む二次電池。 - 前記第2部分の切開部と前記第3部分の切開部によって露出する角は、互いに隣り合う、請求項1に記載の二次電池。
- 前記第1電極の無地部と前記第2部分は接着剤で付着して固定され、
前記第2電極の無地部と前記第3部分は接着剤で付着して固定される、請求項1に記載の二次電池。 - 前記第2部分の切開部を通じて露出した前記第1電極と電気的に連結されている第1電極タップと、
前記第3部分の切開部を通じて露出した前記第2電極と電気的に連結されている第2電極タップと、をさらに含む、請求項1に記載の二次電池。 - 前記第1電極タップと前記第2電極タップは、前記ケースの一端部で外部に引き出されて互いに一定の間隔を置いて離れて位置する、請求項4に記載の二次電池。
- 前記電極組立体の一端と前記ケースの内面との間に設定され、曲がる前記電極組立体の自由端で長さ変化を収容するマージン部を含む、請求項4に記載の二次電池。
- 前記マージン部は、前記第1電極タップと前記第2電極タップの反対側に設定される、請求項6に記載の二次電池。
- 前記ケースは、前記電極組立体の一方の面に配置される第1外装材と、前記電極組立体の他方の面に配置される第2外装材とをさらに含む、請求項1に記載の二次電池。
- 前記第1電極および前記第2電極は、それぞれポリマーシートからなる、請求項1に記載の二次電池。
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