JP6284248B1 - 電気化学セル及び電気化学セルの製造方法 - Google Patents
電気化学セル及び電気化学セルの製造方法 Download PDFInfo
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- JP6284248B1 JP6284248B1 JP2016227168A JP2016227168A JP6284248B1 JP 6284248 B1 JP6284248 B1 JP 6284248B1 JP 2016227168 A JP2016227168 A JP 2016227168A JP 2016227168 A JP2016227168 A JP 2016227168A JP 6284248 B1 JP6284248 B1 JP 6284248B1
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- electrode
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Abstract
Description
このように、正極ケース及び負極ケースで外装体が画成され、外装体の収容部には、電極体が非水電解質とともに内包されている。
また、本発明によれば、第1部材および第2部材の一方をラミネート部材とし、他方を金属とした。これにより、他方の金属を端子部として使用できる。
本発明の電気化学セルは、正極電極および負極電極を含む電極体と、第1部材および第2部材を重ね合わせて形成される外装体と、を備え、前記外装体は、前記電極体が収容される収容部と、前記収容部の外周において、前記第1部材および前記第2部材が融着された状態で前記収容部の外周に沿って、前記外周の全周にわたって折り曲げられた封止部と、を有する、ことを特徴とする。
本発明の電気化学セルは、正極電極および負極電極を含む電極体と、第1部材および第2部材を重ね合わせて形成される外装体と、を備え、前記外装体は、前記電極体が収容される収容部と、前記収容部の外周において、前記第1部材および前記第2部材が融着されてなる封止部と、を有し、前記収容部の外周は円筒状であり、前記封止部は、少なくとも一部が前記収容部の外周に沿って折り曲げられることにより円弧状の曲部を備えている、ことを特徴とする電気化学セル。
本発明によれば、曲部83を収容部の外周に沿って折り曲げることにより、曲部83を収容部の外周に近づけることができる。これにより、収容部の中心軸に対して直交する方向への曲部の張出を小さく抑えることができる。
上記の電気化学セルにおいて、前記第1部材および前記第2部材の少なくとも一方がラミネート部材であり、前記ラミネート部材に、前記ラミネート部材を貫通する貫通電極が設けられた、としてもよい。
本発明によれば、第1部材および第2部材の少なくとも一方をラミネート部材とし、ラミネート部材を貫通する貫通電極を設けた。貫通電極を設けることにより、封止部から外部に端子部を突出させる必要がない。よって、電気化学セルを一層小形にできる。
また、金属シートを含んだラミネート部材を第1部材および第2部材とした場合、ラミネート部材を薄肉に形成することにより、第1部材および第2部材の金属シート間の隙間を小さく抑えることができる。これにより、封止部から外装体の内部に水が浸入することを一層良好に抑えることができる。
よって、封止部を収容部の外周に近づけることができる。これにより、収容部の中心軸に対して直交する方向への張出を小さく抑えることができる。したがって、特に、小形の電気化学セルにおいて、電気化学セルの体積当たりの容量を高めることができる。
上記の電気化学セルの製造方法において、前記封止部の一部は、前記成形工程において、前記封止部の他の部位を折り曲げる成形型で切断される、としてもよい。
上記の電気化学セルの製造方法において、前記封止部の一部は、前記成形工程において、前記封止部の他の部位を折り曲げる成形型とは別の切断装置で切断される、としてもよい。
図1は第1実施形態に係る電池の斜視図である。図2は第1実施形態に係る電池の断面図である。
図1、図2に示すように、電池1は、いわゆるボタン形の電池である。電池1は、電極体2と、電極体2に含浸される電解質溶液(図示せず)と、電極体2が収容された外装体10とを備えている。
また、外装体10は、有底筒状の第1容器17と、有底筒状の第2容器18とを備えている。第1容器17および第2容器18は、それぞれの中心軸が同軸となるように配置されている。以下、第1容器17および第2容器18の中心軸を中心軸Oとし、中心軸Oに沿う方向を軸方向といい、中心軸Oに直交する方向を径方向という。なお、中心軸Oは収容部12の中心軸となる。
第1底壁部21の内面には、第1シーラントリング24を介して銅プレート25が熱融着されている。第1シーラントリング24は、ポリオレフィンのポリエチレンやポリプロピレンなどの熱可塑性樹脂を用いて形成された、シーラントフィルムをリング状にしたものである。
銅プレート25の内面は、電極体2の負極電極3に接続されている。銅プレート25の外面は、中央にニッケルプレート26が溶接されている。ニッケルプレート26は、第1貫通孔23を貫通して外部に露出され、電池1の負極端子26として機能する。電池1の負極端子26は貫通電極である。また、銅プレート25をニッケル製とすれば、ニッケルプレート26はなくともよい。
第2底壁部31には、第2貫通孔35が形成されている。第2貫通孔35は、中心軸Oと同軸に形成されている。
第2底壁部31の内面には、第2シーラントリング37を介してアルミニウムプレート38が熱融着されている。第2シーラントリング37は、第1シーラントリング24と同様に、熱可塑性樹脂により形成されている。
このように、第1容器17および第2容器18をラミネート部材とし、第1容器17および第2容器18に貫通電極26,39を設けた。貫通電極26,39を設けることにより、封止部15から外部に端子部を突出させる必要がない。よって、電池1を小形にできる。
第2周壁部32は、第1周壁部22の内側で、かつ、折曲部33の内側に配置されている。また、折曲部33は、第1周壁部22の内側に配置されている。折曲部33の融着層と第1周壁部22の融着層とが熱融着されている。
折曲部33の融着層と第1周壁部22の融着層とを熱融着する手段として、例えばヒータやレーザなどの熱源を用いる熱融着が挙げられる。また、折曲部33の融着層と第1周壁部22の融着層とは、熱融着の他に、例えば超音波溶接を用いる融着などが可能である。
封止部15は、収容部12の外側に円筒状に形成され、かつ、収容部12の外周12aに沿って折り曲げられている。収容部12の外周12aは、第2周壁部32で形成される。封止部15は、平面視において、円形に形成され、湾曲の曲部を有する。
また、第1容器17および第2容器18の融着層が薄肉に形成されることにより、第1容器17および第2容器18の金属シート間の隙間が小さく抑えられる。これにより、封止部15から外装体10の内部に水が浸入することを一層良好に抑えることができる。
図3は第1実施形態に係る電池1を成形する前の状態を示す斜視図である。
図3の封止工程において、第1容器素材17Aの内面に第1シーラントリング24、銅プレート25(図2参照)を介してニッケルプレート26を溶接する。ニッケルプレート26で負極端子26が形成される。第2容器素材18Aの内面に第2シーラントリング37、アルミニウムプレート38(図2参照)を介してニッケルプレート39を溶接する。ニッケルプレート39で正極端子39が形成される。
第2容器素材18Aの突部42に内側から電極体2(図2参照)を収容し、第2容器素材18Aに第1容器素材17Aを重ね合わせる。第1容器素材17Aの第1フランジ44と第2容器素材18Aの第2フランジ45とを熱融着して封止する。封止された熱融着部46が環状に形成される。
図4(a)の固定工程において、第1容器素材17Aおよび第2容器素材18Aを成形型50に配置する。具体的には、熱融着部46の外周縁46aを成形型50の下型51の載置部51aに載置する。成形型50の上型52に第1容器素材17Aが向けられる。熱融着部46は下型51の下貫通穴53と同軸上に配置される。
図5(a)の成形工程において、パンチ56を矢印の如く上昇する。パンチ56は、下貫通穴53に嵌合可能に形成されたベース57と、ベース57の上部に形成された環状の成形部58とを有する。成形部58の外径寸法は、下貫通穴53および上貫通穴54の内径寸法より小さく形成されている。下貫通穴53と成形部58との間に間隔が形成される。同様に、上貫通穴54と成形部58との間に間隔(図5(b)参照)が形成される。
パンチ56を上昇させて下貫通穴53に嵌合させ、成形部58を熱融着部46の外周縁46aの近傍46bに当接する。
熱融着部46の他の部位46cは、熱融着部46の外周縁46aを含まない部位である。
図6において、製造された電池1を上貫通穴54から取り出す。電池1は、封止部15が収容部12の外周12aに沿って折り曲げられている。よって、封止部15を収容部12の外周12aに近づけることができる。封止部15は、収容部12の中心軸Oに対して直交する方向への張出が小さく抑えられる。これにより、特に、小形の電池1において、電池1の体積当たりの容量を高めることができる。
さらに、封止部15を成形型50で絞り成形した後、切断工程において、成形型50を使用して封止部15から外周縁46aを切断するようにした。これにより、封止部15を絞り成形した後、切断工程において、封止部15から外周縁46aを迅速に切断でき、電池1の生産性を高めることができる。
これにより、外周縁46aの切断に適した切断装置を選択でき、選択した切断装置で封止部15から外周縁46a一層好適に切断できる。切断装置として、例えば回転可能なカッタ、レーザなどが挙げられる。
前記実施形態では、第1容器17および第2容器18の両方にラミネート部材を使用し、ラミネート部材に正極端子 、負極端子 として貫通電極として設けた例について説明したが、これに限定するものではない。その他の例として、例えば、第1容器17および第2容器18の一方をラミネート部材とし、第1容器17および第2容器18の一方に貫通電極を設けることも可能である。
また、第1容器17および第2容器18の他方を金属とすることも可能である。他方を金属とすることにより、他方の金属を端子部として使用できる。
次に、第2実施形態の電池80を図7に基づいて説明する。
図7は、第2実施形態に係る電池の斜視図である。
図7に示すように、電池80は、封止部82が第1実施形態の封止部15と異なるだけで、その他の構成は第1実施形態の電池1と同様である。
封止部82は、曲部83、一対の直線部84,85、および平坦部86を有する。曲部83は、第2周壁部32のうち、一方側の半部32bに沿って半円弧の湾曲状に形成されている。
一対の直線部84,85の一方の直線部84が曲部83の一端83aから直線に延びている。一対の直線部84,85の他方の直線部84が曲部83の他端83bから直線に延びている。一対の直線部84,85間に平坦部86が配置され、一対の直線部84,85が平坦部86で連結されている。
次に、第3実施形態の電池90を図8に基づいて説明する。
図8は、第3実施形態に係る電池の斜視図である。
図8に示すように、電池90は、矩形体に形成された点で第1実施形態の電池1と異なるだけで、その他の構成は第1実施形態の電池1と同様である。
電池90は、矩形体に形成された収容部92と、矩形枠状に形成された封止部95とを有する。収容部92は、第2周壁部93が直線に延びる4つの壁部93a〜93dと、隣接する壁部93a〜93dを連結する4つの角部94a〜94dとを有する。第2周壁部93で、収容部92の外周92aが形成される。
また、曲部97a〜97dは、収容部92の角部94a〜94dに沿って、平面視湾曲に形成されている。よって、曲部97a〜976dを収容部12の角部94a〜94dに近づけることができる。
次に、第4実施形態の電池100を図9に基づいて説明する。
図9は、第4実施形態に係る電池の斜視図である。
図9に示すように、電池100は、一対の端子部103,104を封止部95から突出させた点で第3実施形態の電池90と異なるだけで、その他の構成は第3実施形態の電池90と同様である。
一対の端子部103,104は、封止部102のうち、平行に配置された直線部95a,95cにシーラントフィルム106,107を介して支持され、直線部95a,95cから外部に突出されている。
一対の端子部103,104は、封止部95とともに折り曲げられている。これにより、一対の端子部103,104を収容部108側に寄せることができ、電池100を小さく抑えることができる。収容部108は、第3実施形態の収容部92と類似部材である。
次に、第5実施形態の電池110を図10に基づいて説明する。
図10は、第5実施形態に係る電池の斜視図である。
図10に示しように、電池110は、一対の端子部113,114を封止部15から突出させた点で第1実施形態の電池1と異なるだけで、その他の構成は第1実施形態の電池1と同様である。
一対の端子部113,114は、封止部112にシーラントフィルム116,117を介して支持され、封止部15から外部に突出されている。
一対の端子部113,114は、封止部15とともに折り曲げられている。これにより、一対の端子部113,114を収容部118側に寄せることができ、電池110を小さく抑えることができる。収容部118は、第1実施形態の収容部12と類似部材である。
前記実施形態では、負極電極3と正極電極4とが互い違いに積層するように折り畳まれた積層タイプの電極体2を収容部12,92,108,118に収容した例について説明したが、これに限定するものではない。その他の電極体として、捲回タイプ、ペレットタイプの電極体を収容部12に収容することも可能である。
捲回タイプの電極体は、負極電極3と正極電極4とが捲回されたものである。ペレットタイプの電極体は、セパレータの両側に負極電極3と正極電極4とを備えたものである。
よって、成形型50で封止部15を絞り成形する際に、外周縁46aのうち凹みに対して非接触な部位を封止部15に寄せることができる。これにより、封止部15を一層良好に絞り成形することができる。
2………電極体
3………負極電極
4………正極電極
10……外装体
12,92,108,118……収容部
12a…収容部の外周
15,82,95,102,112…封止部
17……第1容器(第1部材)
18……第2容器(第2部材)
26……負極端子(貫通電極)
32,93…第2周壁部(収容部の外周)
32b…第2周壁部の一方の半部
39……正極端子(貫通電極)
46……熱融着部
46a…熱融着部の外周縁(熱融着部の一部)
46c…熱融着部の他の部位
83,97a〜97d…曲部(封止部の少なくとも一部)
94a〜94d…角部
103,104,113,114…端子部
O………収容部の中心軸
Claims (11)
- 正極電極および負極電極を含む電極体と、
第1部材および第2部材を重ね合わせて形成される外装体と、を備え、
前記外装体は、
前記電極体が収容される収容部と、
前記収容部の外周において、前記第1部材および前記第2部材が融着された状態で前記収容部の外周に沿って折り曲げられた封止部と、を有し、
前記第1部材および前記第2部材の一方がラミネート部材であり、
他方が金属である、
ことを特徴とする電気化学セル。 - 正極電極および負極電極を含む電極体と、
第1部材および第2部材を重ね合わせて形成される外装体と、を備え、
前記外装体は、
前記電極体が収容される収容部と、
前記収容部の外周において、前記第1部材および前記第2部材が融着された状態で前記収容部の外周に沿って、前記外周の全周にわたって折り曲げられた封止部と、
を有する、ことを特徴とする電気化学セル。 - 正極電極および負極電極を含む電極体と、
第1部材および第2部材を重ね合わせて形成される外装体と、を備え、
前記外装体は、
前記電極体が収容される収容部と、
前記収容部の外周において、前記第1部材および前記第2部材が融着されてなる封止部と、
を有し、
前記収容部の外周は円筒状であり、
前記封止部は、少なくとも一部が前記収容部の外周に沿って折り曲げられることにより円弧状の曲部を備えている、
ことを特徴とする電気化学セル。 - 前記第1部材および前記第2部材の少なくとも一方がラミネート部材であり、
前記ラミネート部材に、前記ラミネート部材を貫通する貫通電極が設けられた、
ことを特徴とする請求項2または請求項3に記載の電気化学セル。 - 前記封止部は、少なくとも一部が前記収容部の外周に沿って湾曲に形成された、
ことを特徴とする請求項1または請求項2に記載の電気化学セル。 - 前記封止部に端子部が支持され、
前記端子部が前記封止部とともに折り曲げられた、
ことを特徴とする請求項1〜5のいずれか1項に記載の電気化学セル。 - 前記封止部は、前記第1部材および前記第2部材の他の部位に比べて薄肉に形成されている、
ことを特徴とする請求項1〜6のいずれか1項に記載の電気化学セル。 - 電極体が収容される収容部の外周の封止部を封止する封止工程と、
封止された封止部の一部を固定する固定工程と、
前記封止部の一部を固定した状態で、前記封止部の他の部位を絞り成形により折り曲げる成形工程と、
絞り成形された前記封止部の他の部位から前記封止部の一部を切断する切断工程と、
を含むことを特徴とする電気化学セルの製造方法。 - 前記成形工程の後工程において、前記封止部の一部を切断する、
ことを特徴とする請求項8に記載の電気化学セルの製造方法。 - 前記封止部の一部は、
前記成形工程において、前記封止部の他の部位を折り曲げる成形型で切断される、
ことを特徴とする請求項9に記載の電気化学セルの製造方法。 - 前記封止部の一部は、
前記成形工程において、前記封止部の他の部位を折り曲げる成形型とは別の切断装置で切断される、
ことを特徴とする請求項9に記載の電気化学セルの製造方法。
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CN108091780A (zh) | 2018-05-29 |
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