JP5782642B2 - タブ−リード結合部の電極間抵抗差を最小化した電極組立体及びこれを有する電気化学セル - Google Patents
タブ−リード結合部の電極間抵抗差を最小化した電極組立体及びこれを有する電気化学セル Download PDFInfo
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Description
図1を参照すると、スタック型電極組立体10は、正極集電体21の両面に正極活物質22が塗布されてなる正極20と、負極集電体31の両面に負極活物質32が塗布されてなる負極30とが、分離膜70を介在した状態で順次に積層されて構成される。
前記電気化学セルは、電気化学反応を通じて電気を提供するもので、例えば、電気化学二次電池または電気化学キャパシタであり、特に、リチウム二次電池で好適に適用可能である。
アルミニウム箔と銅箔の両面に、含リチウム正極活物質と含黒鉛負極活物質をそれぞれ塗布した後、該アルミニウム箔と銅箔を、活物質の塗布されていない電極タブが存在するように切断し、正極板と負極板をそれぞれ製造した。その後、分離膜を挟んで上記正極板と負極板を順次積層した後、図3に示すように、正極タブ群及び負極タブ群にそれぞれ正極リード及び負極リードを挟み込んだ状態で溶接し、電極組立体を完成した。
図2A及び図2Bに示すように、正極タブ群の下側部及び負極タブ群の下側部に正極リード及び負極リードをそれぞれ配置した状態で溶接した以外は、上記実施例1と同様にして電極組立体を完成した。
上記実施例1及び比較例1においてそれぞれ製造された20個の電極組立体に対して抵抗測定実験を行い、その結果を、下記の表1に示す。本実験は、それぞれ20個の電極組立体に対して繰り返し行ったし、Agilent milli-ohmmeterを用いて正極タブ−正極リードの結合部での抵抗をそれぞれ測定した。測定した抵抗値を平均して表1に示した。
(1)正極/分離膜/負極構造のスタック型またはスタック/折り畳み型電極組立体であって、電極組立体を構成するそれぞれの電極板には、活物質の塗布されていないタブ(電極タブ)が突出しており、これら電極タブは、一つの電極リードに電気的に連結されており、電極リード−電極タブ結合部での電極間抵抗差が最小限に抑えられるように、結合部において電極リードの上面と下面にそれぞれ複数の電極タブが結合されていることを特徴とする、電極組立体。
(2)前記電極リードを中心に、その上面と下面にそれぞれ結合されている電極タブの数は、略同一であることを特徴とする、(1)に記載の電極組立体。
(3)前記電極リードは、金属プレートであることを特徴とする、(1)に記載の電極組立体。
(4)前記金属プレートは、アルミニウムプレート、銅プレート、ニッケルプレート、ニッケルコートの銅プレート、及びSUSプレートより選ばれたいずれかであることを特徴とする、(3)に記載の電極組立体。
(5)前記電極リードは、垂直断面上、直線の形態を有し、溶接によって前記電極タブと結合されることを特徴とする、(1)に記載の電極組立体。
(6)(1)乃至(5)のいずれかに記載の電極組立体を有する、電気化学セル。
(7)前記電気化学セルは、二次電池またはキャパシタであることを特徴とする、(6)に記載の電気化学セル。
(8)前記二次電池は、金属層と樹脂層を含むラミネートシートからなる電池ケースに、電極組立体が密封状態に内蔵されてなることを特徴とする、(7)に記載の電気化学セル。
(9)前記二次電池は、高出力大容量の電池パックに使用される単位電池であることを特徴とする、(8)に記載の電気化学セル。
Claims (3)
- パウチ形二次電池であって、
正極/分離膜/負極構造のスタック型またはスタック/折り畳み型電極組立体を備えてなり、
前記電極組立体を構成するそれぞれの電極板には、活物質の塗布されていないタブ(電極タブ)が突出しており、
前記電極タブが、一つの電極リードに電気的に連結されており、
前記電極リード−前記電極タブの結合部において、電極リードの上面と下面にそれぞれ複数の電極タブが結合されてなり、
前記電極リードを中心に、その上面と下面にそれぞれ結合されてなる電極タブの数は、略同一であり、及び
前記電極リードが、金属プレートであり、
前記金属プレートが、アルミニウムプレート、銅プレート、ニッケルプレート、ニッケルコートの銅プレート、及びSUSプレートからなる群から選択されたものであり、
前記電極リードが、溶接によって前記電極タブと結合されてなり、
前記電極リードの前記上面に結合された前記電極タブと前記電極リードの前記下面に結合された前記電極タブとが前記電極リード−前記電極タブの結合部において前記電極リードを中心に対称構造をなし、前記電極リードの前記上面に結合された前記電極タブの長さは、前記電極リードの前記下面に結合された前記電極タブの長さより長く、前記電極リードの前記下面に結合された前記複数の電極タブのうちの最下部の電極タブは、折れ曲がっていない、ことを特徴とする、パウチ形二次電池。 - 前記パウチ形二次電池が、金属層と樹脂層を含むラミネートシートからなる電池ケースに、前記電極組立体が密封状態に内蔵されてなることを特徴とする、請求項1に記載のパウチ形二次電池。
- 前記パウチ形二次電池が、高出力大容量の電池パックに使用される単位電池であることを特徴とする、請求項1又は2に記載のパウチ形二次電池。
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KR10-2006-0068825 | 2006-07-24 | ||
KR1020060068825A KR100888284B1 (ko) | 2006-07-24 | 2006-07-24 | 탭-리드 결합부의 전극간 저항차를 최소화한 전극조립체 및이를 포함하고 있는 전기화학 셀 |
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JP2011079216A Pending JP2011155015A (ja) | 2006-07-24 | 2011-03-31 | タブ−リード結合部の電極間抵抗差を最小化した電極組立体及びこれを有する電気化学セル |
JP2011079189A Active JP5782642B2 (ja) | 2006-07-24 | 2011-03-31 | タブ−リード結合部の電極間抵抗差を最小化した電極組立体及びこれを有する電気化学セル |
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JP2011079216A Pending JP2011155015A (ja) | 2006-07-24 | 2011-03-31 | タブ−リード結合部の電極間抵抗差を最小化した電極組立体及びこれを有する電気化学セル |
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US (3) | US20090317717A1 (ja) |
JP (3) | JP2008027894A (ja) |
KR (1) | KR100888284B1 (ja) |
CN (2) | CN101496217A (ja) |
WO (1) | WO2008013381A1 (ja) |
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KR100888284B1 (ko) * | 2006-07-24 | 2009-03-10 | 주식회사 엘지화학 | 탭-리드 결합부의 전극간 저항차를 최소화한 전극조립체 및이를 포함하고 있는 전기화학 셀 |
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WO2008013381A1 (en) | 2008-01-31 |
JP2011155015A (ja) | 2011-08-11 |
KR20080009353A (ko) | 2008-01-29 |
CN102593407B (zh) | 2016-03-30 |
US20150380717A1 (en) | 2015-12-31 |
JP2008027894A (ja) | 2008-02-07 |
CN102593407A (zh) | 2012-07-18 |
US9246154B2 (en) | 2016-01-26 |
US20090317717A1 (en) | 2009-12-24 |
KR100888284B1 (ko) | 2009-03-10 |
US20100248030A1 (en) | 2010-09-30 |
CN101496217A (zh) | 2009-07-29 |
US10026944B2 (en) | 2018-07-17 |
JP2011165672A (ja) | 2011-08-25 |
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