JP6825813B2 - シール装置及び二次電池の製造方法 - Google Patents
シール装置及び二次電池の製造方法 Download PDFInfo
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- JP6825813B2 JP6825813B2 JP2016032080A JP2016032080A JP6825813B2 JP 6825813 B2 JP6825813 B2 JP 6825813B2 JP 2016032080 A JP2016032080 A JP 2016032080A JP 2016032080 A JP2016032080 A JP 2016032080A JP 6825813 B2 JP6825813 B2 JP 6825813B2
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- 238000007789 sealing Methods 0.000 title claims description 42
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 239000000565 sealant Substances 0.000 claims description 33
- 238000000034 method Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000003825 pressing Methods 0.000 claims description 2
- 239000004743 Polypropylene Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 3
- 239000005020 polyethylene terephthalate Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- -1 polypropylene Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004020 conductor Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/01—General aspects dealing with the joint area or with the area to be joined
- B29C66/05—Particular design of joint configurations
- B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
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- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
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- B29C66/72321—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the structure of the material of the parts to be joined being multi-layered comprising a non-plastics layer consisting of metals or their alloys
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
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- B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
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- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
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- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
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- B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
- B29C66/81419—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
- B29C66/81425—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being stepped, e.g. comprising a shoulder
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
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Description
凹部31cは、断面略四角形のタブ端子15の形状に応じて、断面略四角形に形成される。
タブ端子15は硬質材料により断面略四角形に形成され、シールバー31の凹部31cも硬質材料により形成されている。そのため幅方向に位置ずれが生じると、シールバー31の凹部31cの側壁とタブ端子15とが過剰に近接することで、シーラントフィルム17や外装体13の対向壁14,14に強い剪断力が作用する。
その結果、二次電池の使用時にタブ端子15付近に収容液が漏洩したり、外装体13の図示しないアルミニウム層にタブ端子15が接触したりするという問題点がある。
それ故、加圧時にシーラントフィルムや外装体が損傷することを防止できる。またこのシール装置によりヒートシールして得られた二次電池では、使用時にヒートシール部の厚肉シール部に負荷される応力や振動を分散し易く、ヒートシール部の損傷を防止できる。
従ってタブ端子を外部へ突出させたヒートシール部において、収容液の漏洩をより確実に防止できる二次電池を製造するのに好適なシール装置を提供することが可能である。
従ってタブ端子を外部へ突出させたヒートシール部において、収容液の漏洩をより確実に防止できる二次電池の製造方法を提供することが可能である。
従って、タブ端子を外部へ突出させたヒートシール部において、高度に漏洩を防止できるシール装置及び二次電池の製造方法を提供することが可能である。
図1は、二次電池の概略部分平面図であり、図2は、タブ端子と外装体との接合部位を示す部分拡大図であり、図3は、図2のA−A断面図である。
図1から図3に示すように、本実施形態では、正極層11及び負極層12がセパレータ(不図示)を介して積層され、電解質液(不図示)とともに外装体13内に収容されて封止されることで、二次電池10が構成されている。
正極層11及び負極層12には、それぞれタブ端子15が接続されている。各タブ端子15は、シーラントフィルム17を介して二次電池10のヒートシール部21に接合されるとともに外部へ突出している。
各対向壁14はラミネート材料からなる。ラミネート材料は、適宜選択可能であるが、本実施形態では、対向壁14は、内層側から変性PP(ポリプロピレン)層14a、アルミニウム層14b、ナイロン層14c、及びPET(ポリエチレンテレフタレート)層14dが積層されている。
最内層に配置される変性PP層14aは傾斜材料からなり、内層側がシーラントフィルム17と強固に熱溶着可能であり、外層側がアルミニウム層14bと強固に熱溶着可能となっている。
厚肉シール部22は、図3等に示すように、ヒートシール部21の他の部位よりタブ端子15の厚さ方向Zに突出した形状に形成されている。厚肉シール部22が厚さ方向Zに突出する長さは、例えば0.3〜0.5mm程度である。
厚肉シール部22の幅方向X(タブ端子15の幅方向でもある)の両側に設けられた側壁22a(一方の側壁22aは不図示)は、頂部22a1側よりも根元部22a2側の方が両側壁22a間の間隔が広くなるように形成されている。すなわち、一対の側壁22a,22aの頂部22a1間の間隔W1よりも根元部22a2の間隔W2の方が広い。
シーラントフィルム17は、ヒートシール部21に対応する形状でタブ端子15の幅W3(図3参照)より幅広に形成されている。シーラントフィルム17は、タブ端子15の表裏両面をそれぞれ被覆しており、外装体13の対向壁14,14間に配置され、対向壁14,14に接合されている。
図4は、シールバー31を用いてヒートシールを行うシール装置30の部分拡大断面図である。
凹部31cは、タブ端子15よりも広い幅を有するとともにシーラントフィルム17よりも狭い幅に形成されている。
具体的には、図4に示すように、凹部31cの幅方向Xの両側に形成された側壁31dは、第2加圧面31b側の間隔W5よりも開口31c1側の間隔W6の方が広い傾斜面として形成されている。シールバー31において、第1加圧面31aおよび側壁31dにより形成される隅部31eの内角θが鈍角になる。
収容された正極層11及び負極層12のタブ端子15を、シーラントフィルム17により両面側を被覆した状態で、タブ端子15の一部を外装体13から外部へ突出させて外装体13の対向壁14,14間に配置する。
このとき、例えば、対向壁14の変性PP層14a及びシーラントフィルム17が融けて形を変化させる。変性PP層14a及びシーラントフィルム17がシールバー31の両側壁31dに押されることで、シールバー31の凹部31cとタブ端子15との幅方向Xの相対位置の位置ズレが生じた状態で加圧しても、シーラントフィルム17や外装体13の厚みを確保できる。隅部31eの内角θ1が鈍角であることで、加圧時に対向壁14等が損傷しにくい。
その後、適宜残工程を行うことで、二次電池10を製造することが可能である。
従ってタブ端子15を外部へ突出させたヒートシール部21において、収容液の漏洩をより確実に防止することができる。
それ故、加圧時にシーラントフィルム17や外装体13が損傷することを防止できる。また製造された二次電池10では、使用時にヒートシール部21の厚肉シール部22に負荷される応力や振動を分散し易く、ヒートシール部21の損傷を防止できる。
例えば上記実施形態では、シールバー31における凹部31cの側壁31dを傾斜面として形成したが、特に限定されるものではない。
例えば図5に示すように、側壁31dを複数段の段差状に形成することで、凹部31cの開口31c1側ほど側壁31d間の間隔が広くなるように形成してもよい。凹部31cの1段当たりの深さが浅くなることで、加圧時にシーラントフィルム17や外装体13が損傷することを防止できる。
さらに図6に示すように、側壁31dの開口31c1側の端部を曲面形状(円弧状)に形成することで、凹部31cの開口31c1側ほど側壁31d間の間隔が広くなるように形成することも可能である。隅部31eの内角θ1が鈍角であることで、加圧時にシーラントフィルム17や外装体13が損傷することを防止できる。
11…正極層
12…負極層
13…外装体
14…対向壁
14a…変成PP層
14b…アルミニウム層
14c…ナイロン層
14d…PET層
15…タブ端子
17…シーラントフィルム
21…ヒートシール部
22…厚肉シール部
22a…側壁
23a…存在領域
23b…不在領域
30…シール装置
31…シールバー
31a…第1加圧面
31b…第2加圧面
31c…凹部
31d…側壁
33…受け部
Claims (2)
- 外装体に収容された正極層及び負極層の少なくとも一つのタブ端子を、前記外装体から外部へ突出させて該タブ端子より幅広のシーラントフィルムにより被覆した状態で、前記外装体の対向壁間に配置して外側から加熱しつつ加圧するシールバーと、
前記シールバーとともに前記外装体を外側から加熱しつつ加圧する受け部と、
を備えるシール装置において、
前記シールバーは、
前記タブ端子の不在領域を加圧する第1加圧面と、
前記タブ端子に対応するように前記第1加圧面より凹ませて形成され、前記タブ端子の存在領域を加圧する凹部と、を備え、
前記凹部の幅方向の両側に形成された側壁は、該側壁間の間隔が開口側ほど広くなるように形成され、
前記シールバーよりも下方に配置された前記受け部に、前記凹部が対向するように配置され、
前記受け部は、前記シールバーに対向する上面が平坦に形成され、
前記側壁には、
前記第1加圧面に直交し底部側に配置された第1側面と、
前記第1側面に対して開口側に連なるように配置され、前記幅方向の内側かつ前記開口側に向かって凸なる曲面形状に形成された第2側面と、がそれぞれ形成され、
前記一対の第2側面間の間隔が前記開口側ほど広くなるように形成されていることを特徴とするシール装置。 - 請求項1に記載されたシール装置を用いてヒートシールすることで、前記タブ端子を前記外装体から突出させた状態で、前記正極層及び前記負極層を前記外装体内に封止する二次電池の製造方法であって、
前記シーラントフィルムにより被覆された前記タブ端子を前記外装体の対向壁間に配置し、
前記外装体の外側から前記シールバー及び前記受け部により加熱しつつ加圧することで、前記第1加圧面により前記タブ端子の不在領域を加圧するとともに、前記凹部により前記タブ端子の存在領域を加圧することを特徴とする二次電池の製造方法。
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