JPWO2018043419A1 - 積層電極体及び蓄電素子 - Google Patents
積層電極体及び蓄電素子 Download PDFInfo
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- JPWO2018043419A1 JPWO2018043419A1 JP2018537267A JP2018537267A JPWO2018043419A1 JP WO2018043419 A1 JPWO2018043419 A1 JP WO2018043419A1 JP 2018537267 A JP2018537267 A JP 2018537267A JP 2018537267 A JP2018537267 A JP 2018537267A JP WO2018043419 A1 JPWO2018043419 A1 JP WO2018043419A1
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- electrode plate
- positive electrode
- separators
- negative electrode
- welding
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Images
Classifications
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- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
- H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
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- H—ELECTRICITY
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- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
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Abstract
Description
図1の蓄電素子は、それ自体が本発明の別の実施形態である積層電極体1と、この積層電極体1を収容する外装材2とを備える。また、当該蓄電素子は、外装材2の内部に電解質(電解液)が充填されている。
当該積層電極体1は、複数の正極板3と、正極板3の第一面及び第二面を覆う複数対のセパレータ4と、前記セパレータ4を介して前記正極板3に対向する複数の負極板5とを備える。
正極板3は、導電性を有する箔状乃至シート状の正極集電体6と、この正極集電体6の両面に積層される正極活物質層7とを有する。より詳しくは、図2に示すように、正極板3は、正極集電体6の両面に正極活物質層7が積層される平面視多角形状(通常は矩形状)の電極部8と、この電極部8の第一辺Sから突出し、当該蓄電素子の電極端子に電気的に接続されるタブ9とを有する。
正極集電体6の材質としては、アルミニウム、銅、鉄、ニッケル等の金属又はそれらの合金が用いられる。これらの中でも、導電性の高さとコストとのバランスからアルミニウム、アルミニウム合金、銅及び銅合金が好ましく、アルミニウム及びアルミニウム合金がより好ましい。また、正極集電体6の形成形態としては、箔、蒸着膜等が挙げられ、コストの面から箔が好ましい。つまり、正極集電体6としてはアルミニウム箔が好ましい。なお、アルミニウム又はアルミニウム合金としては、JIS−H4000(2014)に規定されるA1085P、A3003P等が例示できる。
正極活物質層7は、正極活物質を含むいわゆる正極合材から形成される。また、正極活物質層7を形成する正極合材は、必要に応じて導電剤、結着剤(バインダ)、増粘剤、フィラー等の任意成分を含む。
セパレータ4は、シート状の樹脂層10と、この樹脂層10に積層される耐熱層11とを有する。セパレータ4は、各正極板3の両側に対をなして配置される。より詳しくは、一対のセパレータ4は、耐熱層11を正極板3に対向させた状態で、正極板3の電極部8の第一面及び第二面を覆う。
樹脂層10は、多孔質樹脂フィルムから形成される。
耐熱層11は、多数の無機粒子と、この無機粒子間を接続するバインダとを含む構成とされる。
複数の溶着領域は、図2に示すように、正極板3のタブ9が設けられる第一辺Sと略平行かつ間欠的に延びる第一溶着領域A1と、第一辺Sと略垂直かつ連続的に延びる第二溶着領域A2とを含む。換言すると、第一溶着領域A1は、タブ9の延出方向と略垂直な電極部8の一対の外縁(図2では、短手方向両側の端縁)に沿ってそれぞれ不連続に間隔を空けて形成され、第二溶着領域A2は、タブ9延出方向と略平行な電極部8の一対の外縁(図2では、長手方向両側の端縁)に沿ってそれぞれ連続して形成される。
負極板5は、正極板3とは異なり、当該積層電極体において、セパレータ4等で袋状に覆われることなく積層されている。
負極集電体12は、上述の正極集電体6と同様の構成とすることができるが、材質としては、銅又は銅合金が好ましい。つまり、負極板5の負極集電体12としては銅箔が好ましい。銅箔としては、圧延銅箔、電解銅箔等が例示される。
負極活物質層13は、負極活物質を含むいわゆる負極板合材から形成される。また、負極活物質層13を形成する負極板合材は、必要に応じて導電剤、結着剤(バインダ)、増粘剤、フィラー等の任意成分を含む。導電剤、結着剤、増粘剤、フィラー等の任意成分は、正極活物質層7と同様のものを用いることができる。
外装材2は、当該積層電極体1を収容し、内部に電解質が封入される。
外装材2に封入される電解質としては、蓄電素子に通常用いられる公知の電解液が使用でき、例えばエチレンカーボネート(EC)、プロピレンカーボネート(PC)、ブチレンカーボネート(BC)等の環状カーボネート、又はジエチルカーボネート(DEC)、ジメチルカーボネート(DMC)、エチルメチルカーボネート(EMC)等の鎖状カーボネートを含有する溶媒に、リチウムヘキサフルオロホスフェート(LiPF6)等を溶解した溶液を用いることができる。
前記実施形態は、本発明の構成を限定するものではない。従って、前記実施形態は、本明細書の記載及び技術常識に基づいて前記実施形態各部の構成要素の省略、置換又は追加が可能であり、それらは全て本発明の範囲に属するものと解釈されるべきである。
2 外装材
3 正極板
4 セパレータ
5 負極板
6 正極集電体
7 正極活物質層
8 電極部
9 タブ
10 樹脂層
11 耐熱層
12 負極集電体
13 負極活物質層
14 電極部
15 タブ
A1 第一溶着領域
A2 第二溶着領域
S 第一辺
Claims (6)
- 第一辺から突出するタブを有する正極板と、
樹脂層と前記樹脂層上に形成された耐熱層とを有し、前記耐熱層を前記正極板に対向させた状態で前記正極板の第一面及び第二面を覆う少なくとも一対のセパレータと、
前記セパレータを介して前記正極板に対向する負極板と
を備え、
前記正極板の外周側に前記少なくとも一対のセパレータが互いに溶着された複数の溶着領域を有し、
前記複数の溶着領域が、前記正極板の第一辺と略平行かつ間欠的に延びる第一溶着領域と、前記第一辺と略垂直かつ連続的に延びる第二溶着領域とを含む積層電極体。 - 前記第二溶着領域が切断面を有する請求項1に記載の積層電極体。
- 前記少なくとも一対のセパレータが前記溶着領域に透光性を有する部分を有し、前記溶着領域の平均幅が10μm以上1000μm以下である請求項1又は請求項2に記載の積層電極体。
- 前記少なくとも一対のセパレータが前記溶着領域に前記耐熱層の砕片を含む請求項1、請求項2又は請求項3に記載の積層電極体。
- 請求項1から請求項4のいずれか1項に記載の積層電極体と、
この積層電極体を収容する外装材と
を備える蓄電素子。 - 前記外装材が金属ケースである請求項5に記載の蓄電素子。
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