JP7396354B2 - 二次電池 - Google Patents
二次電池 Download PDFInfo
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- JP7396354B2 JP7396354B2 JP2021516086A JP2021516086A JP7396354B2 JP 7396354 B2 JP7396354 B2 JP 7396354B2 JP 2021516086 A JP2021516086 A JP 2021516086A JP 2021516086 A JP2021516086 A JP 2021516086A JP 7396354 B2 JP7396354 B2 JP 7396354B2
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Description
本発明は二次電池を提供する。本明細書中、「二次電池」という用語は充電・放電の繰り返しが可能な電池のことを指している。「二次電池」は、その名称に過度に拘泥されるものではなく、例えば、「蓄電デバイス」などの電気化学デバイスも包含し得る。
本発明の一実施形態に係る二次電池は、電極組立体、および当該電極組立体を収容する外装体を有して成る電池であるところ、かかる外装体内に配置されたスペーサの形状に特徴を有する。
本発明の一実施形態に係る二次電池の製造方法は、以下の工程を含む。これにより、かかる二次電池を製造することができる。つまり、本発明に係る二次電池の製造方法は、正極、負極および該正極と該負極との間に配置されたセパレータを積層または巻回し、電極組立体の前駆体を得る工程(電極の組立工程)、第1凹部および第2凹部を有して成るスペーサを形成する工程(スペーサの形成工程)ならびに、電極組立体およびスペーサを外装体に収容させつつ、集電タブを溶着し、外装体内に電解質を注入する工程(収容工程)を含む。
本工程においては、図9に示すように、正極1、負極2および矩形状を有するセパレータ3を所定の順序で配置して積層または巻回することで電極組立体の前駆体を得る。図10Aに示すように、電極組立体の前駆体は、正極1、負極2およびセパレータ3を厚み方向に積層した平面積層型電極組立体200(図1A参照)としてよい。または図10Bのように、電極組立体の前駆体は、正極1、負極2およびセパレータ3を巻回して巻回型電極組立体200(図1B参照)としてもよい。以下では、巻回型電極組立体の組立工程について説明する。
本発明の一実施形態に係る二次電池におけるスペーサの凹部形状は、打ち抜き加工によって所望のスペーサの外縁形状が得られるようにシート状の材料を打ち抜いて形成されてよい。スペーサの凹部形状は、略直線状に形成されたスペーサの外縁から切り欠いて形成されてもよい。または、スペーサの凹部形状は、所望の型枠形状を有する金型内に加熱溶融させた材料を射出注入して冷却固化させる射出成形によって形成されてもよい。
先の工程において得られた電極組立体200およびスペーサ4を外装体300に収容させつつ、集電タブ61および62を電極端子5に溶着し、外装体300内に注入口7を介して電解質を注入する(図2参照)。以下、外装体300が外装体本体部310および外装体蓋部320から構成され、外装体300の1の面に電極端子5および電極端子構造体5’が設けられている場合について詳細に説明する。
11:正極集電体
12:正極材層
2:負極
21:負極集電体
22:負極材層
3:セパレータ
4:スペーサ
41:第1凹部
42:第2凹部
43:第3凹部
5:電極端子
51:正極端子
52:負極端子
5’:電極端子構造体
50:リベット部
51:内側端子
52:ガスケット部
6:集電タブ
61:正極集電タブ
62:負極集電タブ
63:絶縁材
7:電解質注入口
8:貫通した開口部
100:電極構成単位
200:電極組立体
200’:集電タブが突出する端面
300:外装体
310:外装体本体部
320:外装体蓋部
400:二次電池
Claims (16)
- 正極、負極および該正極と該負極との間に配置されたセパレータを含む電極組立体ならびに電解質が外装体に封入された二次電池であって、
前記電極組立体と前記外装体との間に位置付けられるスペーサを有して成り、
前記電極組立体が、該電極組立体から突出する正極集電タブおよび負極集電タブを有して成り、
前記スペーサが、平面視において、外縁に前記正極集電タブのための第1凹部と、前記負極集電タブのための第2凹部とを有して成り、該第1凹部と該第2凹部とが離隔部を介して設けられており、前記正極集電タブおよび前記負極集電タブが前記第1凹部および前記第2凹部をそれぞれ横切り、前記スペーサにおける一方の側から他方の側へと延在しており、前記正極集電タブおよび前記負極集電タブが屈曲形状を成す部分を有し、前記電極組立体とスペーサとの間で前記屈曲形状を成す部分が前記スペーサと接している、二次電池。 - 前記正極集電タブの一部のみおよび前記負極集電タブの一部のみがそれぞれ、断面視又は平面視にて前記第1凹部および前記第2凹部の輪郭面に取り囲まれている、請求項1に記載の二次電池。
- 前記正極集電タブおよび前記負極集電タブがそれぞれ、断面視又は平面視にて前記第1凹部および前記第2凹部の輪郭面に全て取り囲まれないように成っている、請求項1又は2に記載の二次電池。
- 前記スペーサにおける前記離隔部の幅寸法に対する前記第1凹部および前記第2凹部を成す中実部分の幅寸法の比がそれぞれ、0.50以上0.99以下である、請求項1~3のいずれかに記載の二次電池。
- 前記スペーサが、平面視において、外縁の対向する一方の辺に前記第1凹部および前記第2凹部を有して成り、前記外縁の対向する他方の辺が略直線形状を成している、請求項1~4のいずれかに記載の二次電池。
- 前記スペーサの主面の一方が、前記外装体と接している、請求項1~5のいずれかに記載の二次電池。
- 前記スペーサの主面の一方が、前記外装体における電極端子構造体と接している、請求項6に記載の二次電池。
- 前記スペーサが接着層を有して成り、該接着層と前記外装体とが接している、請求項6または7に記載の二次電池。
- 前記スペーサが、平面視において、外縁の一辺に前記第1凹部および前記第2凹部を有して成り、前記スペーサの前記離隔部にて、該スペーサの主面の一方と前記外装体とが接している、請求項6~8のいずれかに記載の二次電池。
- 前記二次電池の断面視において、前記正極集電タブおよび前記負極集電タブの少なくとも一方が、前記スペーサの主面の両側に跨がるように該スペーサにおける一方の側から他方の側へと延在している、請求項1~9のいずれかに記載の二次電池。
- 前記外装体は、電極端子が設けられた同一面内に前記電解質の注入口を有し、前記スペーサが該注入口に対応する第3凹部をさらに有して成る、請求項1~10のいずれかに記載の二次電池。
- 前記スペーサが、平面視において、外縁の対向する一方の辺に前記第1凹部、前記第2凹部および前記第3凹部を有して成り、前記外縁の対向する他方の辺が略直線形状を成している、請求項11に記載の二次電池。
- 前記スペーサの平面視において、該スペーサの外縁が、凹部を成す外縁を除いて、前記外装体の内縁に沿った形状を成す、請求項1~12のいずれかに記載の二次電池。
- 前記外装体が、
正極および負極のいずれか一方の電極端子構造体をさらに有して成り、
導電性ハードケース型外装体であり、前記電極端子構造体と異極の電荷を帯びている、請求項1~13のいずれかに記載の二次電池。 - 前記正極および前記負極がリチウムイオンを吸蔵放出可能となっている、請求項1~14のいずれかに記載の二次電池。
- モバイル機器用途に用いられる、請求項1~14のいずれかに記載の二次電池。
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JP2013182852A (ja) | 2012-03-05 | 2013-09-12 | Sanyo Electric Co Ltd | 密閉型電池 |
JP2014170664A (ja) | 2013-03-04 | 2014-09-18 | Sanyo Electric Co Ltd | 電池 |
WO2017047784A1 (ja) | 2015-09-18 | 2017-03-23 | リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフト | 蓄電素子 |
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