JP2012124171A - 結合部で電極タブの大きさが同一の電極組立体及びこれを有する電気化学セル - Google Patents
結合部で電極タブの大きさが同一の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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Abstract
【解決手段】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において、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、これら電極タブが積層している一側端部には、電極タブを電気的に連結するための電極リードが配置されており、これら電極タブの突出長は、電極リードからの離隔距離に比例して順次増加するように配列され、電極タブ−電極リード結合部での電極タブの長さが同一であることを特徴とする電極組立体及び該電極組立体を有する電気化学セルを提供する。
【選択図】図3
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。
一方、結合部での電極タブの長さ差を低減すべく、電極リードの端部を所定の角度に変形し、近距離の電極タブを大きい度合に折り曲げ、遠距離の電極タブを小さい度合に折り曲げる構造も提案されたことがある。しかしながら、このような構造では、上記のような折り曲げによって電極タブ−電極リード結合部の大きさが増加するため、外部衝撃によって電極組立体が移動しつつ短絡が発生する可能性が高い。特に、中大型電池セルでは、電極リードの厚さが小型電池セルの約2倍もするため変形し難く、よって、この構造の適用はより困難となる。
本願発明の態様は、(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、前記電極タブが積層している一側端部には、電極タブを電気的に連結するための電極リードが配置されており、前記電極タブの突出長は、電極リードからの離隔距離に比例して順次増加するように配列され、電極タブ−電極リード結合部での各電極タブの長さが同一であることを特徴とする、電極組立体及びその製造方法である。
(2)前記電極リードは金属プレートである、(1)に記載の電極組立体である。(3)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プレートのいずれかである、(2)に記載の電極組立体である。(4)前記電極リードは、垂直断面上、直線の形態を有し、溶接によって電極タブと結合される、(1)に記載の電極組立体である。(5) (1)乃至(4)のいずれか一項に記載の電極組立体を有する、電気化学セルである。(6)前記電気化学セルは、二次電池またはキャパシタである、(5)に記載の電気化学セルである。(7)前記二次電池は、金属層及び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で内蔵されてなる、(6)に記載の電気化学セルである。(8)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、(7)に記載の電気化学セルである。
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、アルミニウム箔と銅箔を、活物質の塗布されていないタブ部分が順次増加する長さを有するように切断し、分離膜を挟んで図3のような構造に積層した。その後、アルミニウム箔と銅箔の積層方向に、タブ部分を図4のように密着して電極リードにそれぞれ結合させることで、電極組立体を製造した。
アルミニウム箔と銅箔を、活物質の塗布されていないタブ部分が同じ長さを持つように切断した以外は、上記実施例1と同様にして電極組立体を製造した。
Claims (8)
- 電気化学セルの製造方法であって、
(a)電極タブを備えてなるスタック又はスタック/折り畳み型電極組立体を準備し、
前記電極タブが、電極リードと前記電極タブとの離隔距離に比例して順次増加してなる、それぞれ異なる突出長を有してなり、
(b)前記電極タブを前記電極リードに溶接し、前記電極タブと、前記電極リードとの結合部での各電極タブの長さを同一とし、
(c)電池ケースに前記電極組立体を内蔵することを含んでなる、電気化学セルの製造方法。 - 前記電極タブが積層される方向において、最上段に位置する電極タブの上側面の端部、又は最下段に位置する電極タブの下側面の端部に、電極リードを配置することを含んでなる、請求項1に記載の製造方法。
- 前記電極リードが、直線形態に形成されてなる、請求項1に記載の製造方法。
- 前記電極リードが、金属プレートで形成されてなる、請求項1に記載の製造方法。
- 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プレートのいずれかである、請求項4に記載の製造方法。
- 前記電池ケースが、金属層及び樹脂層を含むラミネートシートで形成されてなる、請求項1に記載の製造方法。
- 前記電気化学セルが、二次電池又はキャパシタである、請求項1に記載の製造方法。
- 請求項1に記載の製造方法によって製造された、電気化学セル。
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| KR1020060068823A KR100848788B1 (ko) | 2006-07-24 | 2006-07-24 | 결합부에서 전극 탭들의 크기가 동일한 전극조립체 및 이를포함하고 있는 전기화학 셀 |
| KR10-2006-0068823 | 2006-07-24 |
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| JP2012013361A Active JP5846932B2 (ja) | 2006-07-24 | 2012-01-25 | 結合部で電極タブの大きさが同一の電極組立体を有する電気化学セルの製造方法 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014027606A1 (ja) * | 2012-08-14 | 2014-02-20 | 株式会社 豊田自動織機 | 蓄電装置 |
| JP2022070663A (ja) * | 2020-10-27 | 2022-05-13 | 日産自動車株式会社 | 全固体電池 |
| JP2024501511A (ja) * | 2021-10-08 | 2024-01-12 | エルジー エナジー ソリューション リミテッド | 二次電池 |
| US12444814B2 (en) * | 2021-11-29 | 2025-10-14 | Lg Energy Solution, Ltd. | Apparatus for welding electrode tabs, method for welding electrode tabs, and secondary battery |
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| WO2014027606A1 (ja) * | 2012-08-14 | 2014-02-20 | 株式会社 豊田自動織機 | 蓄電装置 |
| JP2022070663A (ja) * | 2020-10-27 | 2022-05-13 | 日産自動車株式会社 | 全固体電池 |
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| JP7703660B2 (ja) | 2021-10-08 | 2025-07-07 | エルジー エナジー ソリューション リミテッド | 二次電池 |
| US12444814B2 (en) * | 2021-11-29 | 2025-10-14 | Lg Energy Solution, Ltd. | Apparatus for welding electrode tabs, method for welding electrode tabs, and secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| US8846243B2 (en) | 2014-09-30 |
| WO2008013371A1 (en) | 2008-01-31 |
| CN101517807A (zh) | 2009-08-26 |
| KR100848788B1 (ko) | 2008-07-30 |
| CN102522519A (zh) | 2012-06-27 |
| CN102522519B (zh) | 2015-09-16 |
| JP5846932B2 (ja) | 2016-01-20 |
| KR20080009351A (ko) | 2008-01-29 |
| JP2008027891A (ja) | 2008-02-07 |
| US20100028770A1 (en) | 2010-02-04 |
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