JP2007533099A - 保護素子を内蔵した電極リードを有する電気化学素子 - Google Patents
保護素子を内蔵した電極リードを有する電気化学素子 Download PDFInfo
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- 229910001416 lithium ion Inorganic materials 0.000 description 25
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 11
- 229910052744 lithium Inorganic materials 0.000 description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 9
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- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- 239000001989 lithium alloy Substances 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- 229910002102 lithium manganese oxide Inorganic materials 0.000 description 1
- QEXMICRJPVUPSN-UHFFFAOYSA-N lithium manganese(2+) oxygen(2-) Chemical class [O-2].[Mn+2].[Li+] QEXMICRJPVUPSN-UHFFFAOYSA-N 0.000 description 1
- URIIGZKXFBNRAU-UHFFFAOYSA-N lithium;oxonickel Chemical class [Li].[Ni]=O URIIGZKXFBNRAU-UHFFFAOYSA-N 0.000 description 1
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Classifications
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Abstract
【解決手段】本発明は、正極、負極及び電解質を備えた電極組立体、及び前記電極組立体を包む包装材を含む電気化学素子において、正極を外部端子に接続する正極リード、負極を外部端子に接続する負極リード、または両電極リードがこれに電気的に接続された保護素子を備え、前記保護素子が包装材の内部空間に配され、保護素子を備えた電極リードを保護素子の両側でそれぞれ折り曲げることで保護素子の最大平面が電極リードの存在する包装材内の側面上に積層配置されたことを特徴とする電気化学素子を提供する。また、本発明は、正極、負極及び電解質を備えた電極組立体が裏面と表面を有する包装材で包まれた電気化学素子において、正極を外部端子に接続する正極リード、負極を外部端子に接続する負極リード、または両電極リードがこれに電気的に接続された保護素子を備え、前記保護素子が包装材の裏面と裏面の粘着部位に配され、包装材の粘着部位を折り曲げることで保護素子を備えた粘着部位が包装材の側面に積層されたことを特徴とする電気化学素子を提供する。
Description
最も最近では、日本特開2003−45492号には、熱伝導性の高い方の電極リードに感熱性の保護素子(PTC)を取り付け、当該保護素子をシール部位に配していることを特徴とする電池が開示されている。
以上で説明したような本発明によれば、保護素子を包装材の粘着部位または包装材の内部空間に配し、保護素子の最大平面を包装材の側面上に積層配置することにより、保護素子による体積当たりのエネルギー密度の減少を最小化することができ、且つ保護素子の電池の温度上昇に対する敏感性、反応度合い、伝熱を向上し、電気化学素子の安全性を大幅に向上することができる。
LG化学社製のリチウムイオンポリマー二次電池(商品名:ICP323456、600mAh)に保護素子としてLG電線社製のPTC(モデル名:NSP−L500)を使用した。前記PTCを正極リードに熱融着させて図2bに示す形態にした後、図4に示すようにポーチ形包装材の外部にPTC部分が位置するように取り付けた。
比較例1と同様にLG化学社製のリチウムイオンポリマー二次電池及びLG電線社製のPTCを使用した。実施例1の場合は、前記PTCを正極リードに熱融着させて図2bの形態にした後、図5に示すようにポーチ形包装材の内部シール部位にPTC部分が位置するように取り付けた。
比較例1と同様にLG化学社製のリチウムイオンポリマー二次電池及びLG電線社製のPTCを使用した。同法で前記PTCを正極リードに熱融着させて図2bの形態にした後、図6aに示すようにポーチ形包装材の内部にPTC部分が位置するように取り付けた。このとき、エネルギー密度の損失を最小化するためにPTCシートが電極組立体の積層面(リードが位置する面)と包装材との間に配されるようにリードを折り曲げ、このときのリード間の接続を防止するために、リードをイミド箔で絶縁した(図6a参照)。
比較例1と同様にLG化学社製のリチウムイオンポリマー二次電池及びLG電線社製のPTCを使用した。同法で前記PTCを正極リードに熱融着させて図2dの形態にした後、図7aに示すように正極タップと電極タップとの間にPTCの拡張したシート部分が位置するように取り付けた。このとき、電解液の浸透によるPTC層の破壊を防止するためにPTCをポリマーでコートした。
前記比較例1と同じ電池を用意し、保護素子を有さない一般の形態のリードを使用した。
前記実施例1、2、3及び比較例1、2で製造したリチウムイオンポリマー二次電池を過充電して(20V/3C)計測した温度と電圧の変化をそれぞれ図8(比較例1)、図9(実施例1)、図10(実施例2)、図11(実施例3)、及び図12(比較例2)に示した。図8及び図12から分かるように、PTCを取り付けていない電池とPTCを外部に取り付けた電池ともに発火し爆発したのに対し、図9、図10及び図11に示すように電池の内部にPTC層を設けた場合は、いずれも安全であった。図8及び図12では、いずれも発火し、その温度が200℃にも上ったが、図9、図10、図11では、最高温度がそれぞれ105℃、45℃、35℃を示した(電極組立体の表面温度基準)。また、同図から明らかのように、PTC保護素子のシートがリードから伸びることで電極組立体との接触面積が大きい実施例3の場合が、この実施例3より小さい接触面積を有する実施例2に比べてより安全であることが分かる。
2 包装材(アルミニウムポーチ)
3 正極リード
4 負極リード
5 包装材の粘着部位(シール部位)
6 電極のタップリード部位のV字形状
7 V字形状により画成される正極タップと負極タップとの間の空間
Claims (12)
- 正極、負極及び電解質を備えた電極組立体、及び前記電極組立体を包む包装材を含む電気化学素子であって、
正極を外部端子に接続する正極リード、負極を外部端子に接続する負極リード、または両電極リードがこれに電気的に接続された保護素子を備え、前記保護素子が包装材の内部空間に配され、保護素子を備えた電極リードを保護素子の両側でそれぞれ折り曲げることで保護素子の最大平面が電極リードの存在する包装材内の側面上に積層配置されたことを特徴とする、電気化学素子。 - 正極、負極及び電解質を備えた電極組立体が裏面と表面を有する包装材で包まれた電気化学素子であって、
正極を外部端子に接続する正極リード、負極を外部端子に接続する負極リード、または両電極リードがこれに電気的に接続された保護素子を備え、前記保護素子が包装材の裏面と裏面の粘着部位に配され、包装材の粘着部位を折り曲げることで保護素子を備えた粘着部位が包装材の側面に積層されたことを特徴とする、電気化学素子。 - 前記保護素子は、前記電気化学素子の温度上昇時において電流を遮断する保護素子であることを特徴とする、請求項1または2に記載の電気化学素子。
- 前記保護素子は、PTC、温度ヒューズ(thermal fuse)、バイメタル及びツェナーダイオードから構成された群より選ばれることを特徴とする、請求項1または2に記載の電気化学素子。
- 電気的短絡を防止するために絶縁箔で前記リードまたは前記保護素子をテーピングしたことを特徴とする、請求項1または2に記載の電気化学素子。
- 電解液の浸透が抑えられるポリマーで前記保護素子をコートしたことを特徴とする、請求項1または2に記載の電気化学素子。
- 前記保護素子は、当該保護素子により接続されたリードの長手方向を外れた方向に向かって保護素子の部位が更に伸びたことを特徴とする、請求項1または2に記載の電気化学素子。
- 前記保護素子は、当該保護素子により接続されたリードの長手方向に直交する方向に向かって保護素子が更に伸びたことを特徴とする、請求項7に記載の電気化学素子。
- 前記正極リードまたは負極リードと前記保護素子とが溶接により接続されることを特徴とする、請求項1または2に記載の電気化学素子。
- 前記電気化学素子は、積層された電極組立体に接続された正極リードと負極リードがそれぞれ折り曲げられることでV字形状を形成する積層型電極組立体を備え、前記保護素子が、前記正極リードと負極リードがそれぞれ形成したV字形状により画成された空間に配されたことを特徴とする、請求項1に記載の電気化学素子。
- 請求項1または2に記載の電気化学素子を単数または複数備えてなる、電気化学素子パック。
- 前記電気化学素子の並列または直列接続の組み合わせからなることを特徴とする、請求項11に記載の電気化学素子パック。
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WO2011138959A1 (ja) * | 2010-05-06 | 2011-11-10 | タイコエレクトロニクスジャパン合同会社 | Ptcデバイスおよびそれを有する2次電池 |
JP6026276B2 (ja) * | 2010-07-02 | 2016-11-16 | Littelfuseジャパン合同会社 | Ptcデバイスおよびそれを有する2次電池 |
WO2012132719A1 (ja) * | 2011-03-30 | 2012-10-04 | Necエナジーデバイス株式会社 | 二次電池 |
JP2014146596A (ja) * | 2013-01-29 | 2014-08-14 | Samsung Sdi Co Ltd | バッテリーセル |
WO2016093015A1 (ja) * | 2014-12-08 | 2016-06-16 | タイコエレクトロニクスジャパン合同会社 | 電極 |
CN109920962A (zh) * | 2017-12-13 | 2019-06-21 | 比亚迪股份有限公司 | 电池系统及电动汽车 |
JP2021507454A (ja) * | 2017-12-13 | 2021-02-22 | ビーワイディー カンパニー リミテッド | 電池システム及び電気自動車 |
JP7076552B2 (ja) | 2017-12-13 | 2022-05-27 | ビーワイディー カンパニー リミテッド | 電池システム及び電気自動車 |
CN109920962B (zh) * | 2017-12-13 | 2024-09-13 | 比亚迪股份有限公司 | 电池系统及电动汽车 |
JP2023503480A (ja) * | 2020-04-07 | 2023-01-30 | エルジー エナジー ソリューション リミテッド | 異種金属からなる電極リードおよびその製造方法 |
JP7391459B2 (ja) | 2020-04-07 | 2023-12-05 | エルジー エナジー ソリューション リミテッド | 異種金属からなる電極リードおよびその製造方法 |
Also Published As
Publication number | Publication date |
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EP1756891B1 (en) | 2012-06-13 |
CN100541867C (zh) | 2009-09-16 |
EP1756891A1 (en) | 2007-02-28 |
TW200541130A (en) | 2005-12-16 |
KR20060045625A (ko) | 2006-05-17 |
CA2562960A1 (en) | 2005-10-27 |
BRPI0508427B8 (pt) | 2023-01-10 |
EP2416401B1 (en) | 2013-05-08 |
US7618724B2 (en) | 2009-11-17 |
EP2416401A2 (en) | 2012-02-08 |
TWI262615B (en) | 2006-09-21 |
BRPI0508427B1 (pt) | 2018-02-14 |
JP4802188B2 (ja) | 2011-10-26 |
CA2562960C (en) | 2010-10-19 |
WO2005101547A1 (en) | 2005-10-27 |
EP2416401A3 (en) | 2012-03-28 |
BRPI0508427A (pt) | 2007-07-24 |
KR100678835B1 (ko) | 2007-02-05 |
EP1756891A4 (en) | 2010-03-03 |
RU2326467C1 (ru) | 2008-06-10 |
CN1957488A (zh) | 2007-05-02 |
US20060008698A1 (en) | 2006-01-12 |
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