JP7289659B2 - 全固体電池の筐体構造及びこれを用いたモジュール構造 - Google Patents
全固体電池の筐体構造及びこれを用いたモジュール構造 Download PDFInfo
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- 239000011347 resin Substances 0.000 claims description 26
- 229920005989 resin Polymers 0.000 claims description 26
- 239000007784 solid electrolyte Substances 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 18
- 239000004020 conductor Substances 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 7
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000007773 negative electrode material Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000007774 positive electrode material Substances 0.000 description 3
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
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- 229910018133 Li 2 S-SiS 2 Inorganic materials 0.000 description 1
- 229910012851 LiCoO 2 Inorganic materials 0.000 description 1
- 229910010707 LiFePO 4 Inorganic materials 0.000 description 1
- 229910010945 LiGe0.25P0.75S4 Inorganic materials 0.000 description 1
- 229910015643 LiMn 2 O 4 Inorganic materials 0.000 description 1
- 229910014689 LiMnO Inorganic materials 0.000 description 1
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Description
このようなリチウムイオン電池の安全性の課題を解決するために電解液の代わりに固体の電解質を使用する全固体電池の開発が進められている。
そこで直列接続のための無駄なスペースを取らないでモジュール化が可能な全固体電池の筐体構造が求められる。
図1は、本発明の一実施形態による全固体電池の筐体構造を部分的に切断して内部構造が見えるように示す斜視図である。
図2を参照すると、固体電池積層体20は集電体21の片面に正極22を形成した正極電極23、正極電極23の反対側に位置し、集電体21の正極22と対向する面に負極24を形成した負極電極25、正極電極23と負極電極25との間に位置する複数の固体電解質26、及び隣接する複数の固体電解質26の間にそれぞれ位置して集電体21の片面に正極22を形成し正極22と反対側の面に負極24を形成した複数のバイポーラ電極27とを備える。
ここで固体電池積層体20に使用する材料は固体電池として機能する材料であればその種類や組合せに制限はない。固体電池積層体20のそれぞれの層には以下のような公知の材料が使用される。
樹脂筐体50は以下に示すように金型に注入し硬化させて形成するものであり、熱硬化型の樹脂を使用する。樹脂筐体50は全固体電池の筐体構造1を構造体としてまとめるためのものであり、強度と耐環境性が求められる。そこでエポキシ系の封止材料などの熱硬化型の樹脂を使用する。
図3を参照すると、本発明の一実施形態によるモジュール構造10は、図1に示す全固体電池の筐体構造1を複数個直列に接続した形態を有する。全固体電池の筐体構造1は略直方体であるが、隣接する全固体電池の筐体構造1の一方の露出する正電極プレート30が、他方の全固体電池の筐体構造1の露出する負電極プレートと隣接するように直列に配列される。
前述のように樹脂筐体50は正電極プレート30及び負電極プレート40の電極面より高く突出しないため単純に直列に配列することで電気的に直列接続されたモジュール構造を実現することができるが、正電極プレート30及び負電極プレート40の電極面に微小な凹凸や傾きがあると、正電極プレート30と負電極プレート40との間の接触抵抗が高くなってしまう恐れがある。
複数の全固体電池の筐体構造1を直列に接続してモジュール構造10を形成するためには、接触抵抗の観点から隣接する全固体電池の筐体構造1を互いに押し付けるようにして固定することが望ましい。図5、6はこのための締結方法の一実施形態を示す。
他の実施形態では、締結ボルト71の締結される部分の固体電池積層体20に切り欠き部を設け、切り欠き部の中に納まるようにねじ取付け部を設けることで側面に突起が生じないような形状としてもよい。
図5、6に示す締結体70の形状やこれを用いた締結方法は一つの実施形態であって、複数の全固体電池の筐体構造1が直列に密接された状態で保持できればこの締結方法には限らない。
10 モジュール構造
20 固体電池積層体
21 集電体
22 正極
23 正極電極
24 負極
25 負極電極
26 固体電解質
27 バイポーラ電極
30 正電極プレート
40 負電極プレート
50 樹脂筐体
60 導電性材料
70 締結体
71 締結ボルト
Claims (1)
- 全固体電池の筐体構造を電気的に複数接続するモジュール構造であって、
前記全固体電池の筐体構造は、
集電体の片面に正極を形成した正極電極と、正極電極と対向し集電体の正極と対向する面に負極を形成した負極電極と、正極電極と負極電極との間に位置する複数の固体電解質と、隣接する複数の固体電解質の間にそれぞれ位置して集電体の片面に正極を形成し正極と反対側の面に負極を形成した複数のバイポーラ電極とを備える固体電池積層体と、
前記正極電極に隣接して配置された正電極プレートと、
前記負極電極に隣接して配置された負電極プレートと、
前記固体電池積層体、前記正電極プレート、及び前記負電極プレートの外周部を覆い、前記正電極プレート、及び前記負電極プレートの電極面が露出するように一体化する樹脂筐体と、を有し、
前記樹脂筐体は樹脂成型金型内で前記正電極プレートと、前記負電極プレートとを前記固体電池積層体に押し付ける加圧状態で注入されて固化されることで加圧状態を保ちつつ前記固体電池積層体を封止し、
前記複数の全固体電池の筐体構造は露出する正電極プレートが、他の全固体電池の筐体構造の露出する負電極プレートと隣接するように直列に配列され、
前記対向する正電極プレートと負電極プレートとは導電性材料を挟んで互いに接続され、
前記導電性材料は柔軟性を有する導電性板状部材又は導電性フィルム材、或は導電性のペースト材であることを特徴とするモジュール構造。
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KR1020190039350A KR20200094049A (ko) | 2019-01-29 | 2019-04-04 | 전고체 전지의 케이스 구조 및 이것을 이용한 모듈 구조 |
CN201910974573.7A CN111490187A (zh) | 2019-01-29 | 2019-10-14 | 全固态电池的壳体结构及使用该结构的模块结构 |
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JP2011236937A (ja) | 2010-05-07 | 2011-11-24 | Saginomiya Seisakusho Inc | 電磁弁 |
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JP2011236937A (ja) | 2010-05-07 | 2011-11-24 | Saginomiya Seisakusho Inc | 電磁弁 |
JP2017220447A (ja) | 2016-06-01 | 2017-12-14 | トヨタ自動車株式会社 | 全固体電池の製造方法、全固体電池の製造装置及び全固体電池 |
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