JP2022018213A - 非水電解質二次電池 - Google Patents
非水電解質二次電池 Download PDFInfo
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- JP2022018213A JP2022018213A JP2020121156A JP2020121156A JP2022018213A JP 2022018213 A JP2022018213 A JP 2022018213A JP 2020121156 A JP2020121156 A JP 2020121156A JP 2020121156 A JP2020121156 A JP 2020121156A JP 2022018213 A JP2022018213 A JP 2022018213A
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- positive electrode
- current collector
- electrode body
- layer
- electrode current
- Prior art date
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Abstract
Description
上記(5)の構成によれば、非水電解質二次電池の製造を容易にすることができる。
<リチウムイオン二次電池の全体構成>
図1は、実施の形態1の形態に係るリチウムイオン二次電池の構成の一例を概略的に示す斜視図である。以下では、実施の形態1に係るリチウムイオン二次電池をセル5と記載する。理解を容易にするため、図1にはセル5の内部を透視した図が示されている。
図3は、実施の形態1における電極体6の構成の一例を示す図である。図3に示すように、電極体6は、電池ケース8(ケース本体81)と同様に、扁平直方体の外径形状を有する。電極体6は、扁平直方体の長辺(図中、左右方向(y方向)の辺)が電池ケース8の長辺方向(図2参照)に延在するように電池ケース8に収容されている。
正極1は帯状のシートである。正極1は、正極集電体11と、正極合材層12とを含む。正極集電体11は、正極端子91(図1参照)に電気的に接続されている。正極集電体11は、たとえばアルミニウム(Al)箔、Al合金箔等であり得る。
負極2は帯状のシートである。負極2は、負極合材層22および負極集電体21を含む。負極集電体21は、負極端子92(図1参照)に電気的に接続されている。負極集電体21は、たとえば銅(Cu)箔であり得る。
セパレータ3は帯状のフィルムである。セパレータ3は、正極1と負極2との間に配置され、正極1と負極2とを電気的に絶縁する。セパレータ3の材料は、多孔質材料であって、たとえばポリエチレン(PE)、ポリプロピレン(PP)であり得る。
電解液7は、リチウム(Li)塩および溶媒を少なくとも含む。Li塩は、溶媒に溶解した支持電解質である。Li塩は、たとえば、LiPF6、LiBF4、Li[N(FSO2)2]、Li[N(CF3SO2)2]であり得る。1種のLi塩が単独で使用されてもよいし、2種以上のLi塩が組み合わされて使用されてもよい。
リチウムイオン二次電池の製造工程において電池ケースの内部に金属異物が混入し得ることが知られている。セル5を用いて具体例を挙げて説明すると、たとえば、正極集電体11および負極集電体21の端部をレーザ溶接により接合する際に金属片(スパッタ)が発生する可能性がある。また、電極体6をケース本体81に収容した後、ケース本体81と蓋体82とをレーザ溶接する際にも金属片が発生する可能性がある。さらに、セル5の製造工程以外にも、たとえばセル5を搭載した車両の衝突等により衝撃がセル5に印加されることで金属片が発生する可能性も考えられる。
図4は、図3のIV-IV線に沿う電極体6の断面を模式的に示す図である。図4には、電極体6を構成する正極1、負極2およびセパレータ3の積層構造が電極体6の外側から内側に向けて図示されている。電極体6の外側とは電池ケース8に近い側である。
正極集電体の薄型化以外の構成によって正極集電体の溶断を促進することも可能である。実施の形態2においては、正極集電体に貫通孔を設けることで、正極集電体を熱的に脆弱にする構成について説明する。なお、実施の形態2に係るリチウムイオン二次電池(セル)の全体構成は、図1および図2に示した構成と同様であるため、詳細な説明は繰り返さない。
Claims (5)
- 各々シート状の正極と負極とがセパレータを介して積層された電極体と、
前記電極体を収容する電池ケースとを備え、
前記電極体は、
前記電極体の最も外側に配置された正極およびセパレータからなる最外層を含む外側層と、
前記外側層よりも内側に配置された内側層とを有し、
前記外側層は、前記電極体の短絡に起因する前記電極体の発熱により溶断するように構成された溶断部材を含み、
前記内側層は、前記溶断部材を含まない、非水電解質二次電池。 - 前記正極は、正極集電体と、正極合材層とを含み、
前記外側層に配置された前記正極集電体は、前記内側層に配置された前記正極集電体よりも薄く、
前記溶断部材は、前記外側層に配置された前記正極集電体を含む、請求項1に記載の非水電解質二次電池。 - 前記正極は、正極集電体と、正極合材層とを含み、
前記外側層に配置された前記正極集電体は、複数の貫通孔が設けられた有孔金属箔であり、
前記溶断部材は、前記有孔金属箔を含む、請求項1に記載の非水電解質二次電池。 - 前記有孔金属箔は、パンチングメタル、エキスパンドメタルおよびラスメタルのうちのいずれかである、請求項3に記載の非水電解質二次電池。
- 前記電極体は、積層型である、請求項1~4のいずれか1項に記載の非水電解質二次電池。
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CN202110777361.7A CN113948829B (zh) | 2020-07-15 | 2021-07-09 | 非水电解质二次电池 |
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