JP2017033937A - 電池セル、積層型電池モジュール及び電池 - Google Patents
電池セル、積層型電池モジュール及び電池 Download PDFInfo
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
【解決手段】正極集電体の表面に正極電極活物質と電解液とを含む正極電極組成物層が形成された平板状正極と、負極集電体の表面に負極電極活物質と電解液とを含む負極電極組成物層が形成された平板状負極とがセパレータを介して積層されてなる電池セルに適用される。そして、電池セルに、正極集電体と負極集電体とを貫く貫通孔と、正極集電体及び負極集電体の表面であって貫通孔の端部の近傍にそれぞれ形成された第1及び第2の係合部とを設け、すくなくとも2つの電池セルが、それぞれの電池セルの正極集電体と負極集電体とが隣接するように積層された際に、それぞれの電池セルに設けられた貫通孔が一体に連なり、かつ、一方の電池セルの第1の係合部と第2の係合部とが互いに係合される。
【選択図】図1
Description
図1、図3及び図4を参照して、本発明の一実施形態である電池セル、積層型電池モジュール及びこの積層型電池モジュールが適用された電池について説明する。
被覆用樹脂としては、ビニル樹脂、ウレタン樹脂、ポリエステル樹脂、ポリアミド樹脂、エポキシ樹脂、ポリイミド樹脂、シリコーン樹脂、フェノール樹脂、メラミン樹脂、ユリア樹脂、アニリン樹脂、アイオノマー樹脂、ポリカーボネート等が挙げられる。電解液の吸液性と貫通孔の加工性等の観点から、これらの中ではビニル樹脂、ウレタン樹脂、ポリエステル樹脂又はポリアミド樹脂が好ましく、電解液に浸漬した際の吸液率が10%以上であるものが更に好ましい。
吸液率(%)=[(電解液浸漬後の被覆用樹脂の重量−電解液浸漬前の被覆用樹脂の重量)/電解液浸漬前の被覆用樹脂の重量]×100
吸液率を求めるための電解液としては、好ましくはエチレンカーボネート(EC)、ジエチルカーボネート(DEC)を体積割合でEC:DEC=3:7で混合した混合溶媒に、電解質としてLiPF6を1mol/Lの濃度になるように溶解した電解液を用いる。
吸液率を求める際の電解液への浸漬は、50℃、3日間行う。50℃、3日間の浸漬を行うことにより高分子化合物が飽和吸液状態となる。なお、飽和吸液状態とは、それ以上電解液に浸漬しても被覆用樹脂の重量が増えない状態をいう。
なお、リチウムイオン電池を製造する際に使用する電解液は、上記電解液に限定されるものではなく、他の電解液を使用してもよい。
吸液率は20%以上であることが好ましく、30%以上であることがより好ましい。
また、吸液率の好ましい上限値としては、400%であり、より好ましい上限値としては300%である。
本発明の正極電極組成物層5及び負極電極組成物層6が含む被覆活物質は、活物質の表面の一部又は全部が、被覆用樹脂を含んでなる極被覆層によって被覆されたものであるため、被覆活物質同士が接触すると可逆的に接着して固定化されるため、バインダーを用いることなく電極組成物中に活物質を固定することが可能である。この場合、被覆活物質同士が接触したとしても、接触面において被覆層同士が不可逆的に接着されることはなく、接着は一時的なもので、容易に手でほぐすことができるものであるから、被覆活物質を含んでなる電極組成物層は、活物質が互いに結着されているものではない。
正極電極組成物層5及び負極電極組成物層6の厚さは、100〜10000μmであることが好ましい。
1 リチウム二次単電池(電池セル)
2 正極
3 負極
4 セパレータ
5 正極電極組成物
6 負極電極組成物
7 正極集電体
8 負極集電体
9、10 シール部材
11、14 貫通孔
12、15 凸部
13、16 凹部
20 積層型電池モジュール
21 電池外装容器
Claims (7)
- 正極集電体の表面に正極電極活物質と電解液とを含む正極電極組成物層が形成された平板状正極と、負極集電体の表面に負極電極活物質と電解液とを含む負極電極組成物層が形成された平板状負極とがセパレータを介して積層されてなる電池セルにおいて、
前記電極組成物層が、活物質の表面の少なくとも一部に被覆用樹脂を含む被覆層を有する被覆活物質を含有し、
前記電池セルが、
前記正極集電体と前記負極集電体とを貫く貫通孔と、
前記正極集電体及び前記負極集電体の表面であって前記貫通孔の端部の近傍にそれぞれ形成された第1及び第2の係合部とを備え、
すくなくとも2つの前記電池セルが、それぞれの前記電池セルの前記正極集電体と前記負極集電体とが隣接するように積層された際に、それぞれの前記電池セルに設けられた前記貫通孔が一体に連なり、かつ、一方の前記電池セルの前記第1の係合部と他方の前記電池セルの前記第2の係合部とが互いに係合される
ことを特徴とする電池セル。 - 請求項1記載の電池セルにおいて、
前記貫通孔は、前記電池セルの厚さ方向に延在する筒状のシール部材の内壁により形成されることを特徴とする電池セル。 - 請求項1または2に記載の電池セルにおいて、
前記第1及び第2の係合部は、それぞれ凹部及び凸部を有することを特徴とする電池セル。 - 請求項1〜3のいずれか一項に記載の電池セルにおいて、
前記電極組成物層はさらに導電性繊維を含むことを特徴とする電池セル。 - 請求項4記載の電池セルにおいて、
前記導電性繊維は炭素繊維であることを特徴とする電池セル。 - 請求項1〜5のいずれか一項に記載の電池セルを直列に複数積層してなる積層電池セル構造を含む積層型電池モジュールにおいて、
隣り合う一対の前記電池セルは、一方の前記電池セルの前記集電体上に設けられた前記第1の係合部と他方の前記電池セルの前記集電体上に設けられた前記第2の係合部とが係合して位置決めされていることを特徴とする積層型電池モジュール。 - 請求項6に記載の積層型電池モジュールを有する電池であって、
前記積層型電池モジュールが前記積層型電池モジュールを貫通する前記貫通孔に挿入された締結具と電池外装容器に設けられた固定孔とにより電池外装容器に固定されていることを特徴とする電池。
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