JP2004311318A - Battery - Google Patents

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Publication number
JP2004311318A
JP2004311318A JP2003105969A JP2003105969A JP2004311318A JP 2004311318 A JP2004311318 A JP 2004311318A JP 2003105969 A JP2003105969 A JP 2003105969A JP 2003105969 A JP2003105969 A JP 2003105969A JP 2004311318 A JP2004311318 A JP 2004311318A
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Japan
Prior art keywords
fitting portion
pack
lid
rib
battery
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JP2003105969A
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Japanese (ja)
Inventor
Masayoshi Nakanishi
正義 中西
Ryo Muramoto
僚 村元
Ryuji Maeda
竜司 前田
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Sanyo GS Soft Energy Co Ltd
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Sanyo GS Soft Energy Co Ltd
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Priority to JP2003105969A priority Critical patent/JP2004311318A/en
Publication of JP2004311318A publication Critical patent/JP2004311318A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Battery Mounting, Suspending (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery having a pack container 2 and a pack lid 3 prevented from being jointed by a slippage by forming a rib 2b of which tip part is crushed when the insertion part 3a of the pack lid 3 is fitted into the outer engaging part 2a of the pack container 2. <P>SOLUTION: In the battery formed by fitting and jointing the insertion part 3a of the pack lid 3 made of resin to the outer engaging part 2a of the opening part of the pack container 2 of a housing the unit cell 1 made of resin, a rib 2b, made to further protrude toward inside from the inner circumference face of the outer engaging part 2a to the extent that the protruded tip part is deformed by being pressure contacted on the outer peripheral face of the insertion part 3a when the insertion part 3a is engaged into the outer engaging part 2a, is formed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、容器と蓋とからなる外装体に発電要素を収納した電池や、このような外装体で覆われた電池をさらに容器と蓋とからなるパックケースに収納した電池に関する。
【0002】
【従来の技術】
薄い角形で小型の非水電解質二次電池の単電池1は、図5に示すような樹脂製のパック容器2とパック蓋3の内部に収納されて電池パックとして機器に装着されることがある。図5に示す電池パックの場合、方形容器状のパック容器2の上端開口部を内側からL字形に削って階段状にした外嵌部2aが形成されると共に、方形板状のパック蓋3の下面周縁部に下方に向けて突出された壁板状の嵌入部3aが形成され、この嵌入部3aが外嵌部2aの内側に嵌合して超音波溶接により溶着されることにより、単電池1が収納されたパック容器2の上端開口部がパック蓋3によって塞がれ接合される。なお、単電池1の端子は、この単電池1の側面に配置されたリード材4,5を介してパック容器2に設けられた電池パック端子6,7と接続されるようになっている。これらのリード材4,5と電池パック端子6,7との間には、過充放電等から単電池1を保護するための保護回路や保護素子が挿入される場合もある。
【0003】
また、発電要素を収納した電槽とこの電槽の開口部に被せる蓋に凹部と凸部を形成し、この凹部に凸部を嵌合させて接着剤で接合させることによりこの電槽の開口部を塞いだ鉛蓄電池において、凹部の内周面や凸部の表面に縦方向のリブを複数設けた発明が従来からなされている(例えば、特許文献1参照。)。この発明では、リブによって凸部を凹部の中央に位置させることにより、この凸部の表面と凹部の内周面との間に一定厚さの接着剤の層を介在させて、電槽と蓋の接着強度を高めるようにしている。
【0004】
【特許文献1】
特開平9−251850号公報
【0005】
【発明が解決しようとする課題】
ところが、パック容器2やパック蓋3の成形加工時の精度には限度があるために、図5に示した従来例では、外嵌部2aの内周形状と嵌入部3aの外周形状との間に設計上で例えば0.3〜0.5mm程度の隙間を設けておかなければ、寸法誤差によって嵌入部3aを外嵌部2aに嵌入することができない場合が生じることがある。しかしながら、このような隙間を設けると、パック容器2の外嵌部2aにパック蓋3の嵌入部3aを嵌合させたときに、通常は隙間の部分でガタつきが生じるので、例えばパック容器2とパック蓋3とをずれなく嵌合させたとしても超音波溶接で溶着させる作業時にずれが生じて、これらパック容器2とパック蓋3の外側面に段差が生じ外観上好ましくなくなるだけでなく、機器の電池装着部に電池パックが嵌まり込まなくなるおそれもあるという問題が発生していた。
【0006】
また、上記問題は、発電要素を収納した電槽と蓋等からなる外装体の場合にも同様に発生する。
【0007】
なお、特許文献1には、鉛蓄電池の電槽と蓋の凸部や凹部にリブを形成することにより、この凸部を凹部の中央に位置させて蓋の位置ずれをなくす発明が記載されている。しかしながら、この発明は、正確には、凸部の表面と凹部の内周面との間に、少なくともリブの突出量以上の厚さの接着剤の層を介在させることを目的としたものにすぎず、実際には、リブの先端と凸部の表面や凹部の内周面との間には隙間が生じるので、図5に示した従来例の場合と同様に、電槽と蓋とがずれて接合されるのを避けることはできない。つまり、電槽や蓋が極めて高い寸法精度で作製された場合には、嵌合した凸部と凹部の間にリブが隙間なく嵌まり込んでこの凸部を凹部の中央に正確に配置させることはできるが、現実には加工精度に限度があるため、リブの先端と凸部の表面や凹部の内周面との間には隙間が生じるように設計せざるを得ない。しかも、このリブが隙間なく嵌まり込むような高精度な成形加工が可能であれば、図5に示した従来例の場合にも、パック容器2の外嵌部2aにパック蓋3の嵌入部3aを嵌合させたときに隙間をなくしガタつきが全く生じないようにすることは可能な筈である。従って、この特許文献1の発明の場合にも、凸部を凹部に嵌合した際に、接着剤の層は十分に形成することはできるが、電槽と蓋との間のずれを解消することはできない。
【0008】
特に、この発明の場合、電槽と蓋は、単に鉛蓄電池の外装を覆って内部を保護するだけでなく内部を封止する必要もあるので、リブの先端が凸部の表面や凹部の内周面に圧接される可能性が生じるような設計を行うと、このリブの先端部が潰れたとしても、凸部や凹部もある程度は圧迫されて電槽や蓋の形状に僅かな歪みを生じるため、内部の封止を確実に行う上で好ましくないこととなる。
【0009】
本発明は、かかる事情に対処するためになされたものであり、容器と蓋の嵌入部や外嵌部に、嵌合時に先端部が潰れるようなリブを形成することにより、これら容器と蓋とがずれて接合されることがないようにした電池を提供することを目的としている。
【0010】
【課題を解決するための手段】
請求項1の発明は、1個以上の発電要素又はこの発電要素を外装体で覆ったものを収納した容器の開口部の外嵌部に蓋の嵌入部を嵌合させ、又は、この容器の開口部の嵌入部を蓋の外嵌部に嵌合させて接合した電池において、外嵌部に嵌入部を嵌合させたときに、この嵌入部の外周面に圧接されて突出先端部が変形する程度にこの外嵌部の内周面からさらに内側に突出させたリブ、又は、嵌入部を外嵌部に嵌合させたときに、この外嵌部の内周面に圧接されて突出先端部が変形する程度にこの嵌入部の外周面からさらに外側に突出させたリブが形成されたことを特徴とする。
【0011】
請求項1の発明によれば、容器と蓋の嵌入部と外嵌部を嵌合させると、必ずリブの先端部が嵌入部の外周面や外嵌部の内周面に圧接されて変形するので、寸法誤差をこの変形の大きさ(変形量)によって吸収することができ、嵌入部と外嵌部との間の隙間の部分でガタつきが生じないようにすることができる。しかも、例えば嵌合部の周囲にほぼ等間隔にリブを複数形成した場合には、蓋を嵌合方向に直交する方向には移動自在とし、嵌合方向に真っ直ぐに押し込めば、各リブへの応力を均一にして先端部の変形量をほぼ等しくすることができるので、容器と蓋とをずれなく嵌合させて接合することができるようになる。特に嵌合方向に直交するリブの横断面形状が、例えば台形状や三角形状、半楕円形状等のように先端側ほど幅が狭くなるようにしている場合には、各リブの先端部の変形量をさらに均一にすることができる。もっとも、例えば嵌合部の周囲の一方側にのみリブを形成した場合にも、この一方側のリブの先端部の変形量だけで寸法誤差を吸収することができるので、他方側で接触し合う嵌入部の外周面と外嵌部の内周面を位置基準として、容器と蓋とをある程度の範囲内でずれなく嵌合させて接合することはできる。また、このように嵌合時にリブの先端部が変形すると、蓋が容器から容易には外れないようになるので、電池の組み立て作業時のハンドリング性を向上させることもできるようになる。
【0012】
なお、リブの先端部が嵌入部の外周面や外嵌部の内周面に圧接されると、このリブの先端部が変形するだけでなく、嵌入部を内側に押圧すると共に外嵌部を外側に押圧することになり、これによって容器や蓋の嵌合部の形状に僅かな撓みや歪みを生じることになる。従って、特に発電要素を収納する外装体として用いる電池容器と電池蓋の場合には、このような撓みや歪みによって内部の封止が不確実なものになることがないように、リブの変形量をあまり大きくしないような注意が必要となる。もっとも、電池パックのように、外装体で覆われた電池を内部に収納するためのパック容器とパック蓋の場合には、全てのものが必ずしも内部を完全に封止するために用いられるとは限らず、封止するためのものであったとしても、この封止が不十分な場合に電解液が漏れ出すような心配はないので、防水程度の簡易な封止で足りる。このため、リブの先端部に押圧されてパック容器やパック蓋の外形が僅かに撓んだり歪む程度のことは、電池パックのパック容器とパック蓋の場合では問題となることはない。
【0013】
請求項2の発明は、前記リブの嵌合方向の端部が、この端部側ほど内側又は外側への突出量を少なく形成されたことを特徴とする。
【0014】
請求項2の発明によれば、各リブが嵌合方向の端部側ほど突出量が少なくなるので、嵌入部が外嵌部に嵌合する際にこの端部側がガイドの役割を果たし、嵌合を容易にすることができる。この発明では、リブの突出最先端は、嵌入部の外周面よりも内側に、又は、外嵌部の内周面よりも外側にはみ出しているので、各リブの嵌合方向における端部や基部等での突出量が等しかったとすると、これらの嵌入部と外嵌部を嵌合させる際に無理な嵌め込みが行われる可能性がある。しかしながら、各リブの突出量が端部側ほど少なくなっていれば、嵌入部と外嵌部が最初は嵌まり合うので、容器と蓋との位置合わせが容易になる。そして、例えば容器に蓋を押圧することによりリブの先端部を変形させながら最後まで押し込めば、各リブの変形量をほぼ均一にして容器と蓋とをずれなく嵌め合わせることができる。
【0015】
【発明の実施の形態】
以下、本発明の実施形態について図面を参照して説明する。
【0016】
図1〜図4は本発明の一実施形態を示すものであって、図1は電池パックの構造を示す縦断面正面図、図2は外嵌部の内周面にリブを形成したパック容器の部分拡大縦断面斜視図、図3はリブの突出量を説明するために外嵌部の内周面と嵌入部の外周面の位置関係を示す平面図、図4はパック容器の外嵌部にパック蓋の嵌入部を嵌合させたときのリブの圧迫変形を示す部分拡大縦断面正面図である。なお、図5に示した従来例と同様の機能を有する構成部材には同じ番号を付記する。
【0017】
本実施形態は、図5に示した従来例と同様の薄い角形で小型の非水電解質二次電池の単電池1を収納する電池パックのパック容器2(容器)とパック蓋3(蓋)について説明する。この電池パックは、図1に示すように、方形容器状の樹脂製のパック容器2に単電池1を収納し、このパック容器2の上端開口部の外嵌部2aの内側に方形板状の樹脂製のパック蓋3の嵌入部3aを嵌合させて超音波溶接により溶着したものであり、この構成は従来例と同じである。
【0018】
しかしながら、本実施形態の電池パックは、パック容器2の外嵌部2aの内周面に複数のリブ2bが形成されている。本実施形態の場合、これらのリブ2bは、図2に示すように、方形のパック容器2の四隅のコーナー部ごとに、コーナーの角を挟んだ両側2箇所にそれぞれ形成されている。各リブ2bは、外嵌部2aの内周面から内側に突出した突起であり、幅は比較的狭いが上下方向に長く形成されている。そして、本実施形態の場合、各リブ2bは、上端部が上方側ほど突出量が少なくなるように四半円状に形成されると共に、基部の幅に比べて突出先端部の幅の方が狭くなるように形成されている。
【0019】
上記4箇所のコーナー部にそれぞれ2箇所ずつ、即ち合計8箇所に形成された各リブ2bは、パック容器2の外嵌部2aにパック蓋3の嵌入部3aを嵌合させたときにこの嵌入部3aの外周面に圧接されて突出先端部が変形する程度にこの外嵌部2aの内周面からさらに内側に突出している。つまり、図1の場合であれば、パック蓋3の嵌入部3aにおける背中合わせとなる外周面の間の幅Wは、従来と同様に、パック容器2の外嵌部2aにおける向かい合わせとなる内周面の間の幅よりは狭いが、これら向かい合わせとなる内周面から突設されたリブ2b,2bの突出最先端の間の幅Wよりは僅かに広いものとなる。そして、これは図1に直交する縦断面の場合でも同様となる。即ち、図3に示すように、嵌入部3aの外周面で囲まれた領域Aは、外嵌部2aの内周面で囲まれた領域Aの中に完全に含まれ得るが、この外嵌部2aの内周面で囲まれた領域Aから各リブ2bの横断面形状の領域Aを除いた領域の中には嵌入部3aの外周面で囲まれた領域Aが完全には含まれ得ないことになる。なお、図3では、説明を分かり易くするために、外嵌部2aと嵌入部3aの隙間やリブ2bの大きさを誇張して示している。
【0020】
上記構成のパック容器2の外嵌部2aにパック蓋3の嵌入部3aを嵌合させると、まずこの嵌入部3aの下端が外嵌部2a内に入り込む。そして、この嵌入部3aの下端がリブ2bの上端部の四半円状となった部分にガイドされて、図3に示すように、嵌入部3aの外周面で囲まれた領域Aが周囲のリブ2bの突出先端部とほぼ均等に重なり合うようになるので、外嵌部2aの内周面で囲まれた領域Aのほぼ中央に位置するようになり、パック容器2とパック蓋3との間にずれがなくなる。そこで、このパック蓋3を板面が水平な状態で下方に押し込めば、図4に示すように、嵌入部3aの下端部が各リブ2bの突出先端部を圧迫変形させながら、外嵌部2aの下端の階段状の部分に達する。しかも、各リブ2bは、基部側ほど幅が広くなり、この基部側ほど変形させるために大きな圧迫力が必要となるので、変形量も特定のリブ2bだけが大きくなるようなことなくほぼ等しくなり、パック蓋3がずれのないまま押し込まれるようになる。また、このパック蓋3は、パック容器2の外嵌部2aに形成された複数のリブ2bの間に嵌入部3aを圧入した状態となるので、ガタつきがなくなるだけでなく、この状態で例えばパック容器2を手で持って逆さにしたとしてもパック蓋3が外れて落ちるようなこともなくなり、電池パックの組み立て作業時のハンドリング性を向上させることができる。
【0021】
上記パック蓋3は、上から超音波ホーンを押し当てて超音波溶接を行うことにより、主に嵌入部3aの先端部が外嵌部2aの下端の階段状の部分に溶着して接合が行われる。そして、この超音波溶接の際にも、パック蓋3は、嵌入部3aを周囲のリブ2bによって支持されるので、位置ずれを起こすことなく正確な位置に溶着が行われ、パック容器2とパック蓋3の外側面に段差が生じたり、機器の電池装着部に電池パックが嵌まり込まなくなるようなことがなくなる。
【0022】
なお、上記実施形態では、リブ2bの横断面形状を台形状とした場合を示したが、この横断面形状は三角形状や半楕円形状等のように幅が先端側ほど狭くなるものであれば、どのような形状であってもよい。しかも、このリブ2bの幅は、突出先端部が基部と同じ幅であってもよい。このようにリブ2bの幅が同じであったとしても、基部側の方が外嵌部2aの内周面に支持されるために変形に大きな圧迫力を必要とするので、パック蓋3のずれを防止する効果はある程度期待できる。
【0023】
また、上記実施形態では、リブ2bの上端部が四半円状である場合を示したが、上方側ほど突出量が少なくなる形状であれば、単なる傾斜面やその他の曲面であってもよい。さらに、このリブ2bは、上下方向のいずれの部分も同じ突出量となるような真っ直ぐなものであってもよい。ただし、この場合には、パック蓋3の嵌入部3aを嵌合させる際の最初に引っ掛かりが生じるので、位置合わせを確実にするための治具を用いたり、嵌入部3aの外周面の下端部を下方ほど内側に傾斜した面にする等の工夫が必要となる。さらに、上記実施形態では、各リブ2bを外嵌部2aの下端から上端部の途中まで形成する場合を示したが、上方は上端まで形成してもよく、下方も下端部の途中までしか形成しないようにすることができる。しかも、この下端部は、下方ほど突出量が少なくなるような形状であってもよい。各リブ2bが外嵌部2aの下端まで形成されている場合、この下端部は基部の場合と同様に支持部に近いため変形し難くなるので、嵌入部3aを最後まで確実に押し込むことができないおそれがある。しかしながら、このように各リブ2bが外嵌部2aの下端部の途中までしか形成されなかったり、下端部の突出量が少なくなるようにすれば、嵌入部3aを確実に最後まで押し込むことができるようになると共に、この嵌入部3aの下端部が外側に僅かに広がり嵌合の戻り止めの効果を得ることもできるようになる。
【0024】
また、上記実施形態では、リブ2bを外嵌部2aの四隅のコーナー部ごとに形成する場合を示したが、この形成箇所や形成個数は任意である。ただし、このように方形のパック容器2において最も撓み難い四隅に形成すれば、リブ2bが圧迫変形される際にパック容器2自体も撓んで歪みが生じるのを防止することができる。一般に、外嵌部2aの形状によらず、この外嵌部2aの内周面に沿ってほぼ等間隔に3箇所以上のリブ2bを形成すれば、パック蓋3を押し込む際に自動的に中央に寄るようにしてずれを防止することができる。もっとも、例えば方形の外嵌部2aの内周面における一方の隣接する2辺にのみリブ2bを形成した場合にも、これらのリブ2bの突出先端部の潰れによってガタつきやずれは防止できる。そして、この場合には、方形の外嵌部2aの内周面における他方の隣接する2辺を位置基準としてパック蓋3の嵌入部3aを嵌合させることができるので、これによってパック容器2とパック蓋3のずれをなくすこともできる。
【0025】
また、上記実施形態では、リブ2bをパック容器2の外嵌部2aの内周面に形成する場合を示したが、パック蓋3の嵌入部3aの外周面に形成することもできる。この場合、リブは、パック蓋3の嵌入部3aをパック容器2の外嵌部2aに嵌合させたときに、この外嵌部2aの内周面に圧接されて突出先端部が変形する程度にこの嵌入部3aの外周面からさらに外側に突出させるように形成すればよい。さらに、上記実施形態では、パック容器2に外嵌部2aを形成し、パック蓋3に嵌入部3aを形成する場合を示したが、パック容器2に嵌入部を形成して、パック蓋3には外嵌部を形成することもできる。
【0026】
また、上記実施形態では、パック容器2の外嵌部2aにパック蓋3の嵌入部3aを嵌合させて超音波溶接により溶着させて接合する場合を示したが、熱溶着や接着、その他の手段によって接合することもできる。そして、外嵌部の内側に嵌入部が嵌まり込むものであれば、この接合手段に応じてこれらの外嵌部や嵌入部の形状も任意に変更することができる。
【0027】
また、上記実施形態では、方形のパック容器2やパック蓋3について示したが、円形や長円形、ひし形等の任意の形状のものにも同様に実施可能である。さらに、上記実施形態では、板状のパック蓋3を用いる場合を示したが、例えばこのパック蓋3も浅い容器状を上下逆に配置したものを用いることができる。
【0028】
また、上記実施形態では、パック容器2に1個の単電池1を収納した電池パックについて説明したが、複数個の単電池を収納することもでき、単電池以外の電池を収納することもできる。さらに、上記実施形態では、非水電解質二次電池の電池パックについて説明したが、この電池の種類も任意である。
【0029】
また、上記実施形態では、外装体で覆われた電池を収納する電池パックのパック容器2とパック蓋3について説明したが、発電要素を収納する外装体の電池容器(容器)と電池蓋(蓋)にも同様に実施可能である。
【0030】
【発明の効果】
以上の説明から明らかなように、本発明の電池によれば、リブの先端部の変形によって嵌入部と外嵌部とをガタつきなく正確な位置で嵌合させることができるので、接合した容器と蓋にずれが生じることがなくなり、嵌合部の外観に段差が生じるのを防止すると共に、機器の電池装着部に嵌まり込まなくなるのを防止することもできるようになる。
【図面の簡単な説明】
【図1】本発明の一実施形態を示すものであって、電池パックの構造を示す縦断面正面図である。
【図2】本発明の一実施形態を示すものであって、外嵌部の内周面にリブを形成したパック容器の部分拡大縦断面斜視図である。
【図3】本発明の一実施形態を示すものであって、リブの突出量を説明するために外嵌部の内周面と嵌入部の外周面の位置関係を示す平面図である。
【図4】本発明の一実施形態を示すものであって、パック容器の外嵌部にパック蓋の嵌入部を嵌合させたときのリブの圧迫変形を示す部分拡大縦断面正面図である。
【図5】従来例を示すものであって、電池パックの構造を示す分解斜視図である。
【符号の説明】
1 単電池
2 パック容器
2a 外嵌部
2b リブ
3 パック蓋
3a 嵌入部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a battery in which a power generation element is housed in an exterior body composed of a container and a lid, and a battery in which a battery covered with such an exterior body is further accommodated in a pack case composed of a container and a lid.
[0002]
[Prior art]
A thin rectangular and small non-aqueous electrolyte secondary battery 1 may be housed in a resin pack container 2 and a pack lid 3 as shown in FIG. . In the case of the battery pack shown in FIG. 5, an outer fitting portion 2 a in which the upper end opening of the rectangular container-shaped pack container 2 is cut into an L-shape from the inside to form a step shape is formed, and the rectangular plate-shaped pack lid 3 is formed. A wall-plate-shaped fitting portion 3a protruding downward is formed on the lower surface peripheral portion, and the fitting portion 3a is fitted inside the outer fitting portion 2a and welded by ultrasonic welding, so that the unit cell is formed. The upper end opening of the pack container 2 in which 1 is stored is closed by the pack lid 3 and joined. The terminals of the unit cell 1 are connected to the battery pack terminals 6 and 7 provided in the pack container 2 via lead members 4 and 5 arranged on the side surfaces of the unit cell 1. A protection circuit or a protection element for protecting the unit cell 1 from overcharging and discharging may be inserted between the lead members 4 and 5 and the battery pack terminals 6 and 7 in some cases.
[0003]
Also, a concave portion and a convex portion are formed in the battery case containing the power generating element and a lid covering the opening portion of the battery case, and the convex portion is fitted into the concave portion and joined with an adhesive to open the battery case. Conventionally, in a lead-acid battery having a closed portion, an invention in which a plurality of vertical ribs are provided on the inner peripheral surface of a concave portion or the surface of a convex portion has been made (for example, see Patent Document 1). In the present invention, the convex portion is positioned at the center of the concave portion by the rib, so that an adhesive layer having a constant thickness is interposed between the surface of the convex portion and the inner peripheral surface of the concave portion, and the battery case and the lid are formed. To increase the adhesive strength.
[0004]
[Patent Document 1]
JP-A-9-251850
[Problems to be solved by the invention]
However, since there is a limit to the precision in forming the pack container 2 and the pack lid 3, in the conventional example shown in FIG. 5, there is a gap between the inner peripheral shape of the outer fitting portion 2 a and the outer peripheral shape of the fitting portion 3 a. If a gap of, for example, about 0.3 to 0.5 mm is not provided in the design, there may be cases where the fitting portion 3a cannot be fitted into the outer fitting portion 2a due to a dimensional error. However, if such a gap is provided, when the fitting portion 3a of the pack lid 3 is fitted to the outer fitting portion 2a of the pack container 2, the rattling usually occurs in the gap portion. Even if the package lid 3 and the pack lid 3 are fitted without deviation, a deviation occurs during the operation of welding by ultrasonic welding, and not only is the external appearance of the pack container 2 and the pack lid 3 unfavorable in appearance due to a step, but also There has been a problem that the battery pack may not be fitted into the battery mounting portion of the device.
[0006]
The above problem also occurs in the case of an exterior body including a battery case containing a power generation element, a lid, and the like.
[0007]
Patent Literature 1 discloses an invention in which a rib is formed in a convex portion or a concave portion of a battery case and a lid of a lead storage battery, and the convex portion is positioned at the center of the concave portion to eliminate the displacement of the lid. I have. However, the present invention precisely aims at interposing an adhesive layer having a thickness at least equal to or greater than the protrusion amount of the rib between the surface of the convex portion and the inner peripheral surface of the concave portion. Actually, there is a gap between the tip of the rib and the surface of the convex portion or the inner peripheral surface of the concave portion. Therefore, as in the case of the conventional example shown in FIG. It cannot be avoided that they are joined together. In other words, when the battery case or the lid is manufactured with extremely high dimensional accuracy, the rib is fitted without any gap between the fitted projection and the recess, and this projection is accurately arranged at the center of the recess. However, in practice, there is a limit to the processing accuracy, so that it is necessary to design a gap between the tip of the rib and the surface of the convex portion or the inner peripheral surface of the concave portion. Moreover, if a high-precision molding process in which the rib is fitted without a gap is possible, the fitting portion of the pack lid 3 into the outer fitting portion 2a of the pack container 2 also in the case of the conventional example shown in FIG. It should be possible to eliminate gaps and prevent rattling at all when 3a is fitted. Therefore, also in the case of the invention of Patent Document 1, when the convex portion is fitted into the concave portion, the adhesive layer can be sufficiently formed, but the displacement between the battery case and the lid is eliminated. It is not possible.
[0008]
In particular, in the case of the present invention, the battery case and the lid need not only cover and protect the inside of the lead-acid battery, but also need to seal the inside. If the design is such that there is a possibility that the rib will be pressed against the peripheral surface, even if the tip of this rib is crushed, the convex part and the concave part will be pressed to some extent, causing a slight distortion in the shape of the battery case or lid Therefore, it is not preferable to reliably perform the internal sealing.
[0009]
The present invention has been made in order to cope with such circumstances, and by forming a rib such that a tip portion is crushed at the time of fitting, at a fitting portion or an outer fitting portion of the container and the lid, these containers and the lid are formed. It is an object of the present invention to provide a battery in which the batteries are prevented from being displaced and joined.
[0010]
[Means for Solving the Problems]
The invention according to claim 1 is characterized in that a fitting portion of a lid is fitted into an outer fitting portion of an opening of a container containing one or more power generating elements or a container in which the power generating elements are covered with an outer body, or In a battery in which the fitting portion of the opening is fitted to the outer fitting portion of the lid and joined, when the fitting portion is fitted to the outer fitting portion, the protruding tip portion is deformed by being pressed against the outer peripheral surface of the fitting portion. The ribs protruded further inward from the inner peripheral surface of the outer fitting portion, or the protruding tip is pressed against the inner peripheral surface of the outer fitting portion when the fitting portion is fitted to the outer fitting portion. A rib is formed so as to protrude further outward from the outer peripheral surface of the fitting portion to such an extent that the portion is deformed.
[0011]
According to the first aspect of the present invention, when the fitting portion and the outer fitting portion of the container and the lid are fitted, the leading end of the rib is always pressed against the outer peripheral surface of the fitting portion or the inner peripheral surface of the outer fitting portion to be deformed. Therefore, dimensional errors can be absorbed by the magnitude of this deformation (the amount of deformation), and rattling can be prevented from occurring in the gap between the fitting portion and the outer fitting portion. Moreover, for example, when a plurality of ribs are formed at substantially equal intervals around the fitting portion, the lid can be moved in a direction orthogonal to the fitting direction, and if the cover is pushed straight in the fitting direction, the Since the stress can be made uniform and the amount of deformation at the tip can be made substantially equal, the container and the lid can be fitted and joined without displacement. In particular, when the cross-sectional shape of the rib perpendicular to the fitting direction is narrower toward the distal end side, for example, a trapezoidal shape, a triangular shape, a semi-elliptical shape, etc., deformation of the distal end portion of each rib The amount can be made more uniform. However, for example, even when the rib is formed only on one side around the fitting portion, the dimensional error can be absorbed only by the deformation amount of the tip of the one side rib, so that the other side contacts each other. With the outer peripheral surface of the fitting portion and the inner peripheral surface of the outer fitting portion as position references, the container and the lid can be fitted and joined within a certain range without displacement. In addition, when the tip of the rib is deformed at the time of fitting, the lid does not easily come off from the container, so that the handleability at the time of assembling the battery can be improved.
[0012]
When the tip of the rib is pressed against the outer peripheral surface of the fitting portion or the inner peripheral surface of the outer fitting portion, not only the tip of the rib is deformed, but also the fitting portion is pressed inward and the outer fitting portion is pressed. As a result, the shape of the fitting portion of the container or the lid is slightly bent or distorted. Therefore, in particular, in the case of a battery container and a battery lid used as an exterior body for accommodating a power generation element, the amount of deformation of the rib is set so that the internal sealing is not uncertain due to such bending or distortion. You need to be careful not to make it too large. However, like a battery pack, in the case of a pack container and a pack lid for storing a battery covered with an exterior body inside, all things are not necessarily used to completely seal the inside. The sealing is not limited, and even if it is for sealing, there is no fear that the electrolyte solution leaks out if the sealing is insufficient. Therefore, a simple sealing such as waterproof is sufficient. Therefore, the fact that the outer shape of the pack container or the pack lid is slightly bent or distorted by being pressed by the tip of the rib does not cause a problem in the case of the pack container and the pack lid of the battery pack.
[0013]
The invention according to claim 2 is characterized in that the end of the rib in the fitting direction is formed such that the amount of protrusion toward the inside or outside decreases toward this end.
[0014]
According to the second aspect of the present invention, since the amount of protrusion of each rib becomes smaller toward the end in the fitting direction, when the fitting portion is fitted to the outer fitting portion, the end portion serves as a guide, and Can be facilitated. According to the present invention, the projecting tip of the rib protrudes inward from the outer peripheral surface of the fitting portion or outward from the inner peripheral surface of the outer fitting portion. If the amount of protrusion is equal, it is possible that an excessive fitting may be performed when these fitting portions and the outer fitting portions are fitted. However, if the amount of protrusion of each rib is smaller toward the end, the fitting portion and the outer fitting portion are fitted at first, so that the positioning of the container and the lid becomes easier. Then, for example, by pressing the lid against the container and pushing the rib to the end while deforming the tip, the deformation amount of each rib can be made substantially uniform, and the container and the lid can be fitted without displacement.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
1 to 4 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional front view showing the structure of a battery pack, and FIG. 2 is a pack container having a rib formed on an inner peripheral surface of an outer fitting portion. FIG. 3 is a plan view showing the positional relationship between the inner peripheral surface of the outer fitting portion and the outer peripheral surface of the fitting portion for explaining the protrusion amount of the rib, and FIG. 4 is an outer fitting portion of the pack container. FIG. 7 is a partially enlarged longitudinal sectional front view showing compression deformation of a rib when a fitting portion of a pack lid is fitted to the rib. Components having the same functions as those of the conventional example shown in FIG. 5 are denoted by the same reference numerals.
[0017]
In the present embodiment, a pack container 2 (container) and a pack lid 3 (lid) of a battery pack for accommodating a unit cell 1 of a thin rectangular and small nonaqueous electrolyte secondary battery similar to the conventional example shown in FIG. explain. As shown in FIG. 1, this battery pack contains a unit cell 1 in a rectangular container-shaped resin pack container 2, and has a rectangular plate-like shape inside an outer fitting portion 2 a at an upper end opening of the pack container 2. The fitting portion 3a of the resin pack lid 3 is fitted and welded by ultrasonic welding, and this configuration is the same as the conventional example.
[0018]
However, in the battery pack of the present embodiment, a plurality of ribs 2b are formed on the inner peripheral surface of the outer fitting portion 2a of the pack container 2. In the case of the present embodiment, as shown in FIG. 2, these ribs 2 b are formed at each of the four corners of the rectangular pack container 2 at two places on both sides of the corner. Each rib 2b is a projection that protrudes inward from the inner peripheral surface of the outer fitting portion 2a, and has a relatively small width but is elongated in the vertical direction. In the case of the present embodiment, each rib 2b is formed in a quarter-circle shape such that the amount of protrusion decreases toward the upper end, and the width of the protruding tip is smaller than the width of the base. It is formed so that it becomes.
[0019]
Each of the ribs 2b formed at two places at the four corners, that is, at eight places in total, is fitted when the fitting part 3a of the pack lid 3 is fitted to the outer fitting part 2a of the pack container 2. The protruding tip protrudes further inward from the inner peripheral surface of the outer fitting portion 2a to such an extent that the protruding tip is deformed by being pressed against the outer peripheral surface of the portion 3a. That is, in the case of FIG. 1, the width W 1 between the outer peripheral surfaces that are back-to-back in the fitting portion 3 a of the pack lid 3 is the same as the conventional case, and the width W 1 between the outer fitting portions 2 a of the pack container 2 is the same. narrower than the width between the circumferential surface, but these opposite the composed inner circumferential surface projecting from the ribs 2b, it becomes slightly wider than the width W 2 between the 2b protruding cutting edge. This also applies to the case of a vertical section orthogonal to FIG. That is, as shown in FIG. 3, the area A 1 surrounded by the outer peripheral surface of the fitting portion 3a is be fully contained within the area A 2 that is surrounded by the inner peripheral surface of the outer fitting portion 2a, the completely regions a 1 surrounded by the outer peripheral surface of the fitting portion 3a is within the area a 2 that is surrounded by the inner peripheral surface of the outer fitting portion 2a of the region excluding the region a 3 of the cross-sectional shape of the ribs 2b Cannot be included. In FIG. 3, the size of the gap between the outer fitting portion 2a and the fitting portion 3a and the size of the rib 2b are exaggerated for easy understanding.
[0020]
When the fitting portion 3a of the pack lid 3 is fitted to the outer fitting portion 2a of the pack container 2 having the above configuration, first, the lower end of the fitting portion 3a enters the outer fitting portion 2a. The lower end of the fitting portion 3a of the rib 2b is guided by the portion of a quarter circle-shaped upper portion, as shown in FIG. 3, the area A 1 surrounded by the outer peripheral surface of the fitting portion 3a is around since the overlap substantially uniformly with the projecting tip of the rib 2b, will be positioned substantially at the center of the outer fitting portion region a 2 surrounded by the inner peripheral surface of the 2a, the pack container 2 and the pack lid 3 There is no gap between them. Then, when the pack lid 3 is pushed downward with the plate surface being horizontal, as shown in FIG. 4, the lower end of the fitting portion 3a presses and deforms the projecting tip of each rib 2b, and the outer fitting portion 2a is pressed. Reach the step-like part at the lower end of. In addition, the width of each rib 2b increases toward the base side, and a large pressing force is required to deform the base side. Therefore, the deformation amount becomes substantially equal without increasing only the specific rib 2b. Then, the pack lid 3 is pushed in without any displacement. Further, since the pack lid 3 is in a state in which the fitting portion 3a is press-fitted between the plurality of ribs 2b formed in the outer fitting portion 2a of the pack container 2, not only does the rattle disappear, but also in this state, for example, Even when the pack container 2 is held by hand and turned upside down, the pack lid 3 does not come off and fall off, and the handling at the time of assembling the battery pack can be improved.
[0021]
The pack lid 3 is pressed by an ultrasonic horn from above to perform ultrasonic welding, so that the leading end of the fitting portion 3a is mainly welded to the step-like portion at the lower end of the outer fitting portion 2a to perform joining. Is Also, in this ultrasonic welding, the pack lid 3 is supported at the fitting portion 3a by the surrounding ribs 2b, so that welding is performed at an accurate position without causing displacement, and the pack container 2 and the pack A step is not generated on the outer surface of the lid 3 and the battery pack does not fit into the battery mounting portion of the device.
[0022]
In the above embodiment, the case where the cross-sectional shape of the rib 2b is trapezoidal is shown, but the cross-sectional shape may be triangular or semi-elliptical if the width becomes narrower toward the tip end. Any shape may be used. Moreover, the width of the rib 2b may be such that the protruding tip portion has the same width as the base portion. Even if the widths of the ribs 2b are the same, since the base side is supported by the inner peripheral surface of the outer fitting portion 2a, a large pressing force is required for the deformation, so that the pack lid 3 is displaced. Can be expected to some extent.
[0023]
Further, in the above-described embodiment, the case where the upper end of the rib 2b has a quarter-circle shape has been described, but a simple inclined surface or another curved surface may be used as long as the protrusion amount decreases toward the upper side. Further, the rib 2b may be straight so that all portions in the vertical direction have the same amount of protrusion. However, in this case, when the fitting portion 3a of the pack lid 3 is fitted, catching occurs first. Therefore, a jig for ensuring the alignment is used, or the lower end of the outer peripheral surface of the fitting portion 3a is used. It is necessary to take measures such as making the surface inclined inward toward the lower side. Further, in the above embodiment, the case where each rib 2b is formed from the lower end of the outer fitting portion 2a to the middle of the upper end is shown, but the upper may be formed to the upper end, and the lower may be formed only to the middle of the lower end. Can not be. In addition, the lower end may have a shape such that the amount of protrusion is smaller toward the lower side. When each rib 2b is formed up to the lower end of the outer fitting portion 2a, the lower end portion is close to the supporting portion as in the case of the base portion, so that it is difficult to deform, so that the fitting portion 3a cannot be pushed completely to the end. There is a risk. However, if the ribs 2b are formed only in the middle of the lower end of the outer fitting portion 2a, or the projecting amount of the lower end is reduced, the fitting portion 3a can be securely pushed to the end. At the same time, the lower end of the fitting portion 3a slightly spreads outward, so that the effect of stopping the fitting can be obtained.
[0024]
Further, in the above-described embodiment, the case where the ribs 2b are formed at the four corners of the outer fitting portion 2a has been described, but the locations and the number of the ribs 2b are arbitrary. However, if the ribs 2b are formed at the four corners where bending is least likely to occur in the rectangular pack container 2, it is possible to prevent the pack container 2 itself from bending and being distorted when the rib 2b is pressed and deformed. Generally, regardless of the shape of the outer fitting portion 2a, if three or more ribs 2b are formed at substantially equal intervals along the inner peripheral surface of the outer fitting portion 2a, the center of the pack lid 3 is automatically adjusted when the pack cover 3 is pushed in. , The displacement can be prevented. However, even when the ribs 2b are formed only on one adjacent two sides of the inner peripheral surface of the rectangular outer fitting portion 2a, rattling or displacement can be prevented due to the collapse of the protruding tips of these ribs 2b. In this case, the fitting portion 3a of the pack lid 3 can be fitted with reference to the other two adjacent sides on the inner peripheral surface of the rectangular outer fitting portion 2a. The displacement of the pack lid 3 can be eliminated.
[0025]
In the above embodiment, the case where the rib 2b is formed on the inner peripheral surface of the outer fitting portion 2a of the pack container 2 has been described. However, the rib 2b may be formed on the outer peripheral surface of the fitting portion 3a of the pack lid 3. In this case, when the fitting portion 3a of the pack lid 3 is fitted to the outer fitting portion 2a of the pack container 2, the rib is pressed against the inner peripheral surface of the outer fitting portion 2a to deform the projecting tip. The fitting portion 3a may be formed so as to protrude further outward from the outer peripheral surface of the fitting portion 3a. Further, in the above embodiment, the case where the outer fitting portion 2a is formed in the pack container 2 and the fitting portion 3a is formed in the pack lid 3 has been described, but the fitting portion is formed in the pack container 2 and the pack lid 3 is formed. May form an external fitting.
[0026]
Further, in the above-described embodiment, the case where the fitting portion 3a of the pack lid 3 is fitted to the outer fitting portion 2a of the pack container 2 and welded by ultrasonic welding and joined is shown. It can also be joined by means. If the fitting portion fits inside the outer fitting portion, the shapes of the outer fitting portion and the fitting portion can be arbitrarily changed according to the joining means.
[0027]
In the above-described embodiment, the rectangular pack container 2 and the pack lid 3 have been described. However, the present invention can be similarly applied to any shape such as a circle, an oval, and a rhombus. Further, in the above-described embodiment, the case where the plate-shaped pack lid 3 is used has been described, but for example, the pack lid 3 may be a shallow container-shaped one arranged upside down.
[0028]
Further, in the above-described embodiment, the battery pack in which one unit cell 1 is stored in the pack container 2 has been described. However, a plurality of unit cells can be stored, and batteries other than the unit cell can be stored. . Further, in the above embodiment, the battery pack of the non-aqueous electrolyte secondary battery has been described, but the type of this battery is also arbitrary.
[0029]
Further, in the above embodiment, the pack container 2 and the pack lid 3 of the battery pack for storing the battery covered with the outer package have been described. ) Can be similarly implemented.
[0030]
【The invention's effect】
As is apparent from the above description, according to the battery of the present invention, the fitting portion and the outer fitting portion can be fitted at an accurate position without looseness by deformation of the tip portion of the rib. In addition, it is possible to prevent the lid from being displaced, to prevent a step from occurring in the appearance of the fitting portion, and to prevent the fitting portion from being fitted into the battery mounting portion of the device.
[Brief description of the drawings]
FIG. 1, showing one embodiment of the present invention, is a longitudinal sectional front view showing a structure of a battery pack.
FIG. 2, showing an embodiment of the present invention, is a partially enlarged longitudinal sectional perspective view of a pack container in which a rib is formed on an inner peripheral surface of an outer fitting portion.
FIG. 3 illustrates one embodiment of the present invention, and is a plan view illustrating a positional relationship between an inner peripheral surface of an outer fitting portion and an outer peripheral surface of a fitting portion for explaining a protrusion amount of a rib.
FIG. 4 shows one embodiment of the present invention, and is a partially enlarged longitudinal sectional front view showing compression deformation of a rib when a fitting portion of a pack lid is fitted to an outer fitting portion of a pack container. .
FIG. 5 is an exploded perspective view showing a conventional example and showing a structure of a battery pack.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 unit cell 2 pack container 2 a external fitting part 2 b rib 3 pack lid 3 a fitting part

Claims (2)

1個以上の発電要素又はこの発電要素を外装体で覆ったものを収納した容器の開口部の外嵌部に蓋の嵌入部を嵌合させ、又は、この容器の開口部の嵌入部を蓋の外嵌部に嵌合させて接合した電池において、
外嵌部に嵌入部を嵌合させたときに、この嵌入部の外周面に圧接されて突出先端部が変形する程度にこの外嵌部の内周面からさらに内側に突出させたリブ、又は、嵌入部を外嵌部に嵌合させたときに、この外嵌部の内周面に圧接されて突出先端部が変形する程度にこの嵌入部の外周面からさらに外側に突出させたリブが形成されたことを特徴とする電池。
The fitting portion of the lid is fitted to the outer fitting portion of the opening of the container storing one or more power generating elements or the one in which the power generating element is covered with the outer body, or the fitting portion of the opening portion of the container is covered with the lid. In the battery fitted and joined to the outer fitting portion of
When the fitting portion is fitted to the outer fitting portion, the rib is further pressed inward from the inner circumferential surface of the outer fitting portion so that the protruding tip is deformed by being pressed against the outer peripheral surface of the fitting portion, or When the fitting portion is fitted to the outer fitting portion, a rib protruding further outward from the outer peripheral surface of the fitting portion is pressed to the inner peripheral surface of the outer fitting portion to deform the protruding tip portion. A battery characterized by being formed.
前記リブの嵌合方向の端部が、この端部側ほど内側又は外側への突出量を少なく形成されたことを特徴とする請求項1に記載の電池。2. The battery according to claim 1, wherein the end of the rib in the fitting direction is formed such that the amount of protrusion toward the inside or outside decreases toward this end.
JP2003105969A 2003-04-10 2003-04-10 Battery Pending JP2004311318A (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008282681A (en) * 2007-05-10 2008-11-20 Calsonic Kansei Corp Battery module structure of battery
JP2009538395A (en) * 2006-04-20 2009-11-05 コーラー、カンパニー Trip lever assembly
CN103208594A (en) * 2012-12-04 2013-07-17 丁振荣 Method for sealing and fixing cylindrical battery cell, battery and shell cover
JP2014103120A (en) * 2014-01-15 2014-06-05 Mitsubishi Motors Corp Battery case
JP2014137909A (en) * 2013-01-17 2014-07-28 Sanyo Electric Co Ltd Battery pack
JP2017182998A (en) * 2016-03-29 2017-10-05 株式会社豊田自動織機 Battery pack
US10103409B2 (en) 2013-12-18 2018-10-16 Gs Yuasa International Ltd. Lead-acid battery, manufacturing method of the same, and lid member for lead-acid battery

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009538395A (en) * 2006-04-20 2009-11-05 コーラー、カンパニー Trip lever assembly
JP2008282681A (en) * 2007-05-10 2008-11-20 Calsonic Kansei Corp Battery module structure of battery
WO2008142924A1 (en) * 2007-05-10 2008-11-27 Calsonic Kansei Corporation Cell module structure of battery
US8632906B2 (en) 2007-05-10 2014-01-21 Calsonic Kansei Corporation Battery-cell module structure of battery
CN103208594A (en) * 2012-12-04 2013-07-17 丁振荣 Method for sealing and fixing cylindrical battery cell, battery and shell cover
JP2014137909A (en) * 2013-01-17 2014-07-28 Sanyo Electric Co Ltd Battery pack
US10103409B2 (en) 2013-12-18 2018-10-16 Gs Yuasa International Ltd. Lead-acid battery, manufacturing method of the same, and lid member for lead-acid battery
JP2014103120A (en) * 2014-01-15 2014-06-05 Mitsubishi Motors Corp Battery case
JP2017182998A (en) * 2016-03-29 2017-10-05 株式会社豊田自動織機 Battery pack

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