JP2015060651A - 非水電解質電池、組電池及び蓄電池装置 - Google Patents
非水電解質電池、組電池及び蓄電池装置 Download PDFInfo
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- JP2015060651A JP2015060651A JP2013192071A JP2013192071A JP2015060651A JP 2015060651 A JP2015060651 A JP 2015060651A JP 2013192071 A JP2013192071 A JP 2013192071A JP 2013192071 A JP2013192071 A JP 2013192071A JP 2015060651 A JP2015060651 A JP 2015060651A
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- Prior art keywords
- lead
- nonaqueous electrolyte
- electrolyte battery
- battery
- negative electrode
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- DVATZODUVBMYHN-UHFFFAOYSA-K lithium;iron(2+);manganese(2+);phosphate Chemical compound [Li+].[Mn+2].[Fe+2].[O-]P([O-])([O-])=O DVATZODUVBMYHN-UHFFFAOYSA-K 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
- H01M50/557—Plate-shaped terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
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Abstract
【解決手段】実施の形態の非水電解質電池は、電極群と、電極群に電気的に接続された電極リードと、ケースとを具備する。ケースは、主部と、端部に形成された封止部と、主部と封止部との間に位置した電極リードを挟持する第1の領域と第2の領域よりなるリード挟持部とを含む。ケースの主部は、電極群を収容している。リード挟持部の第1の領域又は第2の領域は開口部を備える。電極リードの少なくとも一部は開口部を通して露出する。
【選択図】 図1
Description
第1の実施の形態によれば、非水電解質電池が提供される。この非水電解質電池は、電極群と、電極群に電気的に接続された電極リードと、ケースとを具備する。ケースは、主部と、端部に形成された封止部と、主部と封止部との間に位置した電極リードを挟持する第1の領域と第2の領域よりなるリード挟持部とを含む。ケースの主部は、電極群を収容している。リード挟持部の第1の領域又は第2の領域は開口部を備える。電極リードの少なくとも一部は開口部を通して露出する。
負極は、例えば、負極活物質、導電剤及び結着剤を適当な溶媒に分散させて得られる負極剤ペーストを、負極集電体の片側又は両面に塗布し、これを乾燥させることにより作製することができる。乾燥後、プレスをすることもできる。
平均結晶粒子径の範囲が50μm以下の範囲にあるアルミニウム箔又はアルミニウム合金箔は、材料組成、不純物、加工条件、熱処理履歴ならび焼なましの加熱条件など多くの因子に複雑に影響され、前記結晶粒子径(直径)は、製造工程の中で、前記諸因子を組み合わせて調整される。
正極は、例えば、正極活物質、導電剤及び結着剤を適当な溶媒に分散させて得られる正極剤ペーストを、正極集電体の片側又は両面に塗布し、これを乾燥させることにより作製することができる。乾燥後、プレスを行うこともできる。
セパレータとしては、例えば、多孔質セパレータを用いることができる。
非水電解質としては、LiBF4、LiPF6、LiAsF6、LiClO4、LiCF3SO3、LiN(CF3SO2)2、LiN(C2F5SO2)2、Li(CF3SO2)3C、LiB[(OCO)2]2などから選ばれる一種以上のリチウム塩を0.5〜2mol/Lの範囲内にある濃度で有機溶媒に溶解した有機電解液が挙げられる。
ケースとして使用され得るステンレス部材の厚さは、0.2mm以下にすることが望ましい。例えば、最内層に位置する熱融着性樹脂フィルム(熱可塑性樹脂フィルム)、ステンレスからなる金属箔及び剛性を有する有機樹脂フィルムをこの順序で積層した複合フィルム材から構成することが可能である。
正極に電気的に接続され得る電極リード、すなわち正極リードとしては、例えばアルミニウム、チタン及びそれらをもとにした合金、ステンレスなどを用いることができる。
リード挟持部の第1の領域又は第2の領域が含むことができる更なる絶縁部材は、例えば、熱可塑性樹脂からなる絶縁リング又は絶縁部材であり得る。
(3)正極リード4a及び負極リード4bは、短冊状ではない。
第2の実施の形態によれば、組電池が提供される。この組電池は、第1の実施の形態に係る複数個の非水電解質電池を具備する。また、この組電池は、バスバーを更に具備する。このバスバーは、隣り合う非水電解質電池の電極リードのうちリード挟持部の開口部を通して露出した部分を電気的に接続している。
第3の実施の形態によれば、蓄電池装置が提供される。この蓄電池装置は、第2の実施の形態に係る組電池と、この組電池を収容する外装材とを備える。
以下に実施例を説明するが、本発明の主旨を超えない限り、本発明は以下に記載される実施例に限定されるものではない。
本実施例では、以下に示す点を除き、図1〜図5に示す非水電解質電池1と同様の非水電解質電池1を以下の手順で作製した。すなわち、本実施例の非水電解質電池1は、図19にその概略平面図を示すように、ケース2が、折り返し部を含んでおらず、その4つの端部に形成された4つの封止部2Cを含んでいる。なお、本実施例の非水電解質電池1の図19に示す線II−IIに沿った断面図は、図2に示した第1の実施の形態に係る第1の例の非水電解質電池の断面図と同様である。
・正極31の作製
正極活物質であるスピネル型構造を有するリチウムマンガン酸化物(LiMn1.9Al0.1O4)粉末90重量%と、導電剤であるアセチレンブラック5重量%と、ポリフッ化ビニリデン(PVdF)5重量%とをN−メチルピロリドン(NMP)に加えて混合してスラリーを調製した。このスラリーを厚さ15μmのアルミニウム箔からなる集電体31aの両面に塗布した後、乾燥し、プレスすることにより電極密度が2.9g/cm3の正極を作製した。
負極活物質であるスピネル型構造を有するリチウムチタン酸化物(Li4Ti5O12)粉末90重量%、導電剤であるアセチレンブラック5重量%およびポリフッ化ビニリデン(PVdF)5重量%をN−メチルピロリドン(NMP)加えて混合してスラリーを調製した。このスラリーを厚さ15μmのアルミニウム箔からなる集電体32aの両面に塗布し、乾燥した後、プレスすることにより電極密度が2.3g/cm3の負極を作製した。
次に、セパレータ33として、厚さ20μmのポリエチレン製多孔質フィルムからなるセパレータを用意した。
次に、正極リード4a及び負極リード4bである短冊状の2枚のアルミニウム箔を用意した。用意した正極リード4aを、正極集電タブ31dに超音波溶接した。同様に、用意した負極リード4bを、負極集電タブ32dに超音波溶接した。
次に、図19及び図2に示すケース2を用意した。
エチレンカーボネート(EC)とジエチルカーボネート(DEC)とを体積比率1:2になるように混合して混合溶媒を調製した。この混合溶媒に電解質としての六フッ化リン酸リチウム(LiPF6)を1.2mol/Lの濃度で溶解することにより液状非水電解質を調製した。
ケース2のケース本体21の凹部21Aに設けられた注入口(図示していない)を介して、非水電解質を注入した。
比較例1では、以下の点を除いては実施例と同様の方法により、非水電解質電池1を作製した。
比較例2では、以下の点を除いては実施例と同様の方法により、非水電解質電池1を作製した。
比較例3では、以下の方法で、図20〜図22に示す非水電解質電池200を作製した。
・容量測定
実施例、比較例1、比較例2及び比較例3の非水電解質電池のそれぞれについて、25℃、環境下、1Cレートで充放電を1回行い、初回放電容量を測定した。結果を表1に示す。
実施例、比較例1、比較例2及び比較例3の非水電解質電池1を50個作製し、25℃の環境下で、50%の充電量(SOC50%)の状態における電池の厚さを測定した。その後、温度60℃、湿度93%に制御した恒温恒湿槽に3ヶ月貯蔵した。貯蔵後の電池を恒温恒湿槽から取り出し、25℃の環境下に放置し、電池温度を25℃に戻してから厚さを測定し、電池厚さの増加率{=(貯蔵後電池厚さ−貯蔵前電池厚さ)/貯蔵前電池厚さ}を表1に併記した。また、貯蔵後の電池を1Cレートで放電した後、25℃環境下、1Cレートで充放電を1回行った。得られた放電容量を回復容量とし、回復容量率(=回復容量/初回放電容量×100)を表1に併記した。なお、電池厚さの増加率、回復容量率は50個の平均値を示した。
Claims (6)
- 電極群と、
前記電極群に電気的に接続された電極リードと、
前記電極群を収容した主部と、端部に形成された封止部と、前記主部と前記封止部との間に位置した、前記電極リードを挟持する第1の領域と第2の領域よりなるリード挟持部とを含むケースと
を具備し、
前記リード挟持部の前記第1の領域又は前記第2の領域は開口部を備え、前記電極リードの少なくとも一部が前記開口部を通して露出する非水電解質電池。 - 前記電極リードが前記リード挟持部の前記開口部の周縁に熱シールされている請求項1に記載の非水電解質電池。
- 前記リード挟持部の第1の領域が、前記電極リードに接触する第1の絶縁部材を含み、
前記リード挟持部の第2の領域が、前記電極リードに接触する第2の絶縁部材を含む
請求項1または2に記載の非水電解質電池。 - 前記封止部がシーム溶接により封止されている請求項1ないし3の何れか1項に記載の非水電解質電池。
- 複数個の請求項1に記載の非水電解質電池と、
隣り合う前記非水電解質電池の前記電極リードのうち前記リード挟持部の前記開口部を通して露出した部分を電気的に接続したバスバーと
を具備する組電池。 - 請求項5に記載の組電池と、
前記組電池を収容する外装材と
を備えた蓄電池装置。
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WO2003096446A1 (en) * | 2002-05-14 | 2003-11-20 | Hitachi Maxell, Ltd. | Thin battery |
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WO2003096446A1 (en) * | 2002-05-14 | 2003-11-20 | Hitachi Maxell, Ltd. | Thin battery |
WO2013002058A1 (ja) * | 2011-06-28 | 2013-01-03 | 株式会社 村田製作所 | 蓄電デバイス |
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US9859536B2 (en) | 2013-12-26 | 2018-01-02 | Kabushiki Kaisha Toshiba | Nonaqueous electrolyte battery including a sealed case, battery pack and storage battery apparatus |
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