JP2018537819A - 寿命特性が向上した電池システムおよび電池システムの稼動方法 - Google Patents
寿命特性が向上した電池システムおよび電池システムの稼動方法 Download PDFInfo
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- JP2018537819A JP2018537819A JP2018528292A JP2018528292A JP2018537819A JP 2018537819 A JP2018537819 A JP 2018537819A JP 2018528292 A JP2018528292 A JP 2018528292A JP 2018528292 A JP2018528292 A JP 2018528292A JP 2018537819 A JP2018537819 A JP 2018537819A
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- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
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Abstract
Description
一または二以上の二次電池セルを含む電池システムであって、
第1電解液と電極組立体が電池ケースに内蔵された状態で電池ケースが密封された構造の二次電池セルで電力を発生させる第1形態;および
前記第1形態に対して、二次電池セルの最大容量が20%から60%減少した状態の二次電池セルで電力を発生させる第2形態;および
前記第2形態で最大容量が減少した状態で第1電解液と組成が異なる第2電解液が電池ケース内部に追加注液された構造の二次電池セルで電力を発生させる第3形態;を含み、
前記第3形態で第2電解液が追加された二次電池は、第2形態の二次電池セルに対して、内部抵抗が10%から60%低いことを特徴とする。
前記第1形態と第2形態で二次電池セルは、ラミネートシートに電極組立体と第1電解液が内蔵された状態でラミネートシートの外周辺が熱融着された構造であってもよい。
反面、前記電池ケースは、金属層と樹脂層を含むラミネートシートであり、前記第3形態で二次電池セルは、ラミネートシート内部に電極組立体、第1電解液および第2電解液が内蔵された状態でラミネートシートの外周辺が熱融着されている構造であってもよい。
(a)第1電解液と電極組立体が電池ケースに内蔵された状態で電池ケースが密封された構造の二次電池セルを利用して電力を発生させる段階;
(b)前記二次電池セルの充放電サイクルが50回から2000回である時、二次電池セルの最大容量を検知する段階;
(c)前記段階(b)で検知された最大容量が段階(a)での最大容量に対して、10%から50%低い時、二次電池セルに第2電解液を追加的に注液する段階;および
(d)前記段階(c)で第2電解液が注液された二次電池セルで電力を発生させる段階;を含むことを特徴とする。
前記段階(c)は、熱融着されたラミネートシートの一部に開口を穿孔する段階(i)をさらに含み、前記開口を通じて第2電解液を二次電池セルに注液することができる。場合によっては、前記段階(i)で二次電池セル内部に存在するガスの排気のために一つ以上の追加開口をさらに穿孔させることもできる。
正極活物質として、リチウムニッケルコバルトマンガン複合酸化物であるLiNi0.5Mn0.3Co0.2O2 95重量%、Super−P(導電剤)3重量%およびPVdF(バインダー)2重量%をNMPに添加して正極混合物スラリーを製造した。これをアルミニウム箔の一面にコーティング、乾燥および圧着して正極を製造した。
実施例で製造されたパウチ型ラージセルの充放電を1400サイクル実施しながら200サイクル単位で抵抗を測定した。以降、EC:DMC:EMC=3:2:5である溶媒にリチウム塩としてLiPF6が入っている第2電解液をパウチ型ラージセルに追加的に注液した後、パウチ型ラージセルの充放電を200サイクル追加的に実施して抵抗を測定し、その結果を図5に示した。
実施例で製造されたパウチ型ラージセルの充放電を1400サイクル実施しながら200サイクル単位で容量を測定した。ここで、容量がほぼ35%減少した時点で、EC:DMC:EMC=3:2:5である溶媒にリチウム塩としてLiPF6が入っている第2電解液をパウチ型ラージセルに追加的に注液した後、パウチ型ラージセルの充放電を200サイクル追加的に実施して容量を測定し、その結果を図6に示した。
実施例で製造されたパウチ型ラージセルの充放電を1400サイクル実施した後、パウチ型ラージセルを完全放電させた後、最大容量まで完全充電しながら抵抗を測定した。
Claims (18)
- 一または二以上の二次電池セルを含む電池システムであって、
第1電解液と電極組立体が電池ケースに内蔵された状態で電池ケースが密封された構造の二次電池セルで電力を発生させる第1形態;および
前記第1形態に対して、二次電池セルの最大容量が20%から60%減少した状態の二次電池セルで電力を発生させる第2形態;および
前記第2形態で最大容量が減少した状態で第1電解液と組成が異なる第2電解液が電池ケース内部に追加注液された構造の二次電池セルで電力を発生させる第3形態;を含み、
前記第3形態で第2電解液が追加された二次電池セルは、第2形態の二次電池セルに対して、内部抵抗が10%から60%低い、電池システム。 - 前記電池ケースは、金属層と樹脂層を含むラミネートシートであり;
前記第1形態と第2形態で二次電池セルは、ラミネートシートに電極組立体と第1電解液が内蔵された状態でラミネートシートの外周辺が熱融着された構造である、請求項1に記載の電池システム。 - 前記電池ケースは、金属層と樹脂層を含むラミネートシートであり;
前記第3形態で二次電池セルは、ラミネートシート内部に電極組立体、第1電解液および第2電解液が内蔵された状態でラミネートシートの外周辺が熱融着されている構造である、請求項1に記載の電池システム。 - 前記電池ケースは、熱融着された外周辺と隣接した部位に開口が穿孔されており、前記開口を通じて第2電解液が電池ケース内部に注液された状態で、前記開口を密封する形態に絶縁テープが付加されている、請求項3に記載の電池システム。
- 前記電池ケースは、熱融着された外周辺と隣接した部位に開口が穿孔されており、前記開口を通じて第2電解液が電池ケース内部に注液された状態で、前記開口の周辺部が熱融着された形態に密封されている、請求項3に記載の電池システム。
- 前記第1電解液は、リチウム塩、非水系溶媒、および電極被膜形成剤を含む、請求項1に記載の電池システム。
- 前記第2電解液は、リチウム塩および非水系溶媒を含む、請求項1に記載の電池システム。
- 前記第3形態で第2電解液は、第1形態での第1電解液の総重量に対して、3%から50%である、請求項1に記載の電池システム。
- 前記第2形態は、第1形態に対して、二次電池セルの最大容量が25%から45%減少した状態の二次電池セルで電力を発生させる、請求項2に記載の電池システム。
- 二以上の二次電池セルが電気的に直列および/または並列に連結された状態で電力を外部デバイスに提供する、請求項1に記載の電池システム。
- 一または二以上の二次電池セルを含む電池システムを稼動する方法であって、
(a)第1電解液と電極組立体が電池ケースに内蔵された状態で電池ケースが密封された構造の二次電池セルを利用して電力を発生させる段階;
(b)前記二次電池セルの充放電サイクルが50回から2000回である時、二次電池セルの最大容量を検知する段階;
(c)前記段階(b)で検知された最大容量が段階(a)での最大容量に対して、10%から50%低い時、二次電池セルに第2電解液を追加的に注液する段階;および
(d)前記段階(c)で第2電解液が注液された二次電池セルで電力を発生させる段階;
を含む方法。 - 前記電池ケースは、金属層と樹脂層を含むラミネートシートが熱融着された構造であり、
前記段階(c)は、熱融着されたラミネートシートの一部に開口を穿孔する段階(i)をさらに含み、前記開口を通じて第2電解液を二次電池セルに注液する、請求項11に記載の方法。 - 前記段階(c)は、第2電解液の注液完了後、前記開口を密封する段階(ii)をさらに含む、請求項12に記載の方法。
- 前記段階(ii)は、前記開口の周辺部を熱融着して密封する過程、または前記開口および開口の周辺部に絶縁テープを付加して密封する過程である、請求項13に記載の方法。
- 第2電解液の注液時、電極組立体の電極が外部空気に露出しないように電解液注液機により前記開口が0.001mmから0.01mmの直径で穿孔されると同時に密閉される、請求項13に記載の方法。
- 前記段階(c)で第2電解液は、段階(a)から段階(b)で枯渇した第1電解液を代替して二次電池セルの容量低下および抵抗増加を抑制する、請求項11に記載の方法。
- 前記段階(c)で第2電解液は、段階(a)で最初に二次電池セルに存在する第1電解液の総重量に対して、3%から50%である、請求項11に記載の方法。
- 前記第1電解液は、リチウム塩、非水系溶媒、および電極被膜形成剤を含み、前記第2電解液は、リチウム塩および非水系溶媒を含む、請求項11に記載の方法。
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CN108475811B (zh) | 2021-11-02 |
EP3379634A1 (en) | 2018-09-26 |
KR102145492B1 (ko) | 2020-08-18 |
US20190006635A1 (en) | 2019-01-03 |
KR20170140919A (ko) | 2017-12-22 |
WO2017217646A1 (ko) | 2017-12-21 |
CN108475811A (zh) | 2018-08-31 |
US10916820B2 (en) | 2021-02-09 |
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