JP6779905B2 - 電気化学デバイス - Google Patents
電気化学デバイス Download PDFInfo
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- JP6779905B2 JP6779905B2 JP2017552335A JP2017552335A JP6779905B2 JP 6779905 B2 JP6779905 B2 JP 6779905B2 JP 2017552335 A JP2017552335 A JP 2017552335A JP 2017552335 A JP2017552335 A JP 2017552335A JP 6779905 B2 JP6779905 B2 JP 6779905B2
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Description
[二次電池の構成]
図1a,1bは、本発明の電気化学デバイスの一実施形態であるフィルム外装二次電池を模式的に示している。図1aは二次電池の主面(平坦な面)に対して垂直上方から見た平面図であり、図1bは図1aのA−A線断面図である。図2は正極の要部の拡大断面図、図3は負極の要部の拡大断面図である。
二次電池の製造にあたって、まず二次電池用の電極2,3を製造する。具体的には、図2に示すように、正極集電体9の両面に正極活物質層10をそれぞれ形成する。未塗布部との境界部分における塗布部(正極活物質層10)の端部は、正極集電体9に対して実質的に垂直に切り立っていてもよく、また、正極活物質層10の中央部と比べて厚さが低減する斜面状または階段状であってもよい。また、図3に示すように、負極集電体11の両面に負極活物質層12をそれぞれ形成する。負極活物質層12の端部(塗布部の端部)は、負極集電体11に対して実質的に垂直に切り立っていてもよく、また、負極活物質層12の中央部と比べて厚さが低減する斜面状または階段状であってもよい。このようにして形成された正極2と負極3とを、セパレータ4を介して交互に積層し、正極端子7および負極端子8を接続する。
2 正極(正極シート)
3 負極(負極シート)
4 セパレータ
5 電解液
6 可撓性フィルム(ラミネートフィルム)
7 正極端子(電極端子)
7a,13a 丸められたコーナー部
8 負極端子(電極端子)
9 正極用の集電体(正極集電体)
10 正極用の活物質層(正極活物質層)
11 負極用の集電体(負極集電体)
12 負極用の活物質層(負極活物質層)
13 金属片(サポートタブ)
14 外装容器
15 ホーン
16 接合部
17 蓄電要素(電極積層体)
18 封止材(シーラント)
19 アンビル
Claims (8)
- 2種類の電極がセパレータを介して重なり合う蓄電要素と、前記蓄電要素と電解液とを収容する可撓性フィルムからなる外装容器とを有し、前記2種類の電極はいずれも、集電体上に活物質層が形成された塗布部と、前記活物質層が形成されていない未塗布部とを有する、電気化学デバイスであって、
前記2種類の電極の各々に、一端部が前記外装容器の内部で前記電極の前記未塗布部と重ね合わせられ、他端部が前記外装容器の外部に延びている電極端子と、前記外装容器の内部において前記電極端子の前記一端部とともに前記未塗布部を挟み込むサポートタブとがそれぞれ設けられ、前記未塗布部と前記電極端子と前記サポートタブとは互いに重なり合う位置で互いに接合されており、
前記サポートタブは、少なくとも90度以下の角部を含まない平面形状を有している、電気化学デバイス。 - 前記サポートタブは、2つの直線状の辺が1点で交わる部分を含まない平面形状を有している、請求項1に記載の電気化学デバイス。
- 同じ種類の複数の前記電極の前記未塗布部が互いに重ね合わせられて集合部を構成しており、該集合部が、前記電極端子の前記一端部と前記サポートタブとに挟み込まれた状態で、前記集合部と前記電極端子と前記サポートタブとが互いに重なり合う位置で互いに接合されている、請求項1または2に記載の電気化学デバイス。
- 前記サポートタブは、四角形の4つのコーナー部が丸み付けられた平面形状を有している、請求項1から3のいずれか1項に記載の電気化学デバイス。
- 丸み付けられた前記コーナー部の曲率半径は1.0mm〜2.0mmである、請求項4に記載の電気化学デバイス。
- 前記サポートタブは、2本の平行な直線の端部がそれぞれ円弧によって互いに接続された平面形状を有している、請求項1から3のいずれか1項に記載の電気化学デバイス。
- 前記サポートタブは、楕円形の平面形状を有している、請求項1から3のいずれか1項に記載の電気化学デバイス。
- 前記電気化学デバイスは二次電池である、請求項1から7のいずれか1項に記載の電気化学デバイス。
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