JP3599391B2 - Method of manufacturing prismatic battery - Google Patents

Method of manufacturing prismatic battery Download PDF

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JP3599391B2
JP3599391B2 JP30604694A JP30604694A JP3599391B2 JP 3599391 B2 JP3599391 B2 JP 3599391B2 JP 30604694 A JP30604694 A JP 30604694A JP 30604694 A JP30604694 A JP 30604694A JP 3599391 B2 JP3599391 B2 JP 3599391B2
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JPH08162074A (en
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英明 小澤
秀明 北爪
秀実 北條
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FDK Twicell Co Ltd
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Toshiba Battery Co Ltd
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    • 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
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
    • H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

【０００１】
【産業上の利用分野】
本発明は、有底矩形筒状容器の開口端付近に封口部材がかしめ固定により取り付けられた角形電池の製造方法に関するものである。
【０００２】
【従来の技術】
近年、機器の小型軽量化にともない、体積効率の高い角形電池の開発が行われている。前記角形電池の一例である角形ニッケル水素二次電池は、有底矩形筒状の容器内に、ニッケル正極と水素吸蔵合金負極との間に合成樹脂繊維製セパレータを介装して作製された電極群と、アルカリ電解液とが収納され、前記容器の開口端付近に封口板が取り付けられた構造を有する。前記容器の開口端付近に封口板を取り付ける方法としては、次に示すかしめ固定が知られている。まず、開口端付近が拡口されることにより形成された段部を有する有底矩形筒状の容器を用意する。前記容器内に前記電極群を収納し、前記電解液を収容した後、予め封口板が収納された底部に矩形の穴を有する有底矩形筒状の絶縁ガスケットを載置する。前記容器の開口端付近を縮径並びに前記容器の開口端を内方に折り曲げることにより前記容器の開口端付近に前記封口板を取り付ける。
【０００３】
前記容器の開口端を折り曲げる工程では、矩形穴を有する下型と、前記下型の上方に配置された角形凹部を有するカール金型が用いられる。ところで、前記容器は、ガスが発生して内圧が上昇した際にその長手方向側の面が外方に湾曲するのを抑制するために厚さをおよそ０．４ｍｍにする。このような厚さを持つ容器は、０．４５ｍｍ〜０．５ｍｍの鋼板を多段プレスにより深絞り加工することにより作製される。このため、底面から側面につながる立上った部分の曲率半径が全周に亘り均一になるように前記容器を作製することが困難である。前記容器の底面から長辺側側面につながる立上った部分の曲率半径をｒ１ とし、底面から短辺側側面につながる立上った部分の曲率半径をｒ２ とし、底面からコーナにつながる立上った部分の曲率半径をｒ３ とした時、前記容器は前記曲率半径が次式
ｒ３ ＞ｒ２ ≧ｒ１ （１）
を満たす形状に作製される傾向がある。また、前記容器の前記曲率半径ｒ１ は、中央部に位置する部分が最も小さくなる傾向がある。一方、従来より、前記下型の前記矩形穴は、底部内面から内周面全周につながる立上った部分の曲率半径が前記容器の底面から長辺側側面の中央部につながる立上った部分の曲率半径と等しい形状になっていた。
【０００４】
このような形状の容器の下部をこの下型の矩形穴に挿入すると、前記容器の前記底面から長辺側側面につながる立上った部分が前記矩形穴の底部内面から長辺側内周面につながる立上った部分に嵌合されて前記容器は前記下型に固定される。次いで、前記金型の前記凹部の内周面に前記容器の開口端を当接させて前記容器の開口端を内方に折曲げようとすると、前記容器に押圧力が加わる。前記容器に押圧力が加わると、前記容器は前記押圧力と釣り合うように底面から側面全周につながる立上った部分の曲率半径が小さくなる変形をする。しかしながら、前記容器の前記底面から長辺側側面につながる立上った部分は、前記矩形穴の底部内面から長辺側内周面につながる立上った部分との間に余分なスペースがないため、曲率半径が小さくなる変形ができず、容器のこの部分に負荷がかかる。また、前記容器の前記押圧力に対する強度はコーナ、短辺側の側面、長辺側の側面の順に低くなる。このため、前記容器の前記底面から長辺側の側面につながる立上った部分にこのような負荷がかかると、前記容器に座屈変形が生じて前記容器の長辺側の下部側面に凹みが生じるという問題点があった。容器にこのような変形が生じる場合には、前記金型で前記容器の開口端を押圧して前記容器の開口端を内方に折り曲げようとしても前記開口端は所望の角度まで折り曲がらなくなるという問題点があった。その結果、前記二次電池の気密性が低下するため、例えば過充電によりガスが発生して電池内圧が上昇した際にガス圧により前記容器の開口端付近に位置する長手方向側の面が外方に湾曲し、前記容器の長手方向側の開口端と絶縁ガスケットとの間に隙間が生じてガス漏れを生じるという問題点があった。
【０００５】
また、前記下型として矩形穴の底部内面から内周面全周につながる立上った部分の曲率半径が前記容器の底面から長辺側側面中央部につながる立上った部分の曲率半径よりも大きい構造を有するものを用いた場合、前記容器の底面から長辺側側面中央部につながる立上った部分が前記矩形穴の前記立上がった部分のうちの長辺側中央部に位置する部分に当接される。この状態で前記金型により前記容器の開口端を内方に折り曲げようとすると、前記容器の底面から長辺側側面中央部につながる立上った部分に負荷がかかるため、前記容器の長辺側下部側面の中央部に変形が生じるという問題点があった。
【０００６】
一方、前記下型として矩形穴の底部内面から内周面全周につながる立上った部分の曲率半径が前記容器の底面から長辺側側面中央部につながる立上った部分の曲率半径よりも小さい構造を有するものを用いて前記折り曲げ工程を行うと、前記容器は、この時に加わる押圧力と釣り合うまで底面から側面全周につながる立上った部分の曲率半径が小さくなる変形をする。この変形の際に前記容器の底面から長辺側側面中央部につながる立上った部分は、前記容器の底面からコーナにつながる立上った部分の変形に追従できないため、前記容器の長辺側下部側面の中央部に変形が生じるという問題点があった。
【０００７】
【発明が解決しようとする課題】
本発明の目的は、有底矩形筒状の容器が変形するのを防止することができ、前記容器の開口端を所望の角度で内方に折り曲げて開口端付近に封口部材を気密性良く取付けることが可能な折り曲げ工程を備えた角形電池の製造方法を提供しようとするものである。
【０００８】
【課題を解決するための手段】
本発明の角形電池の製造方法は、開口端付近を拡口することにより形成された段部を有する有底矩形筒状の容器内に正極と負極との間にセパレータを介装して作製された電極群を収納する工程と、前記容器内に電解液を収容する工程と、前記容器の前記段部上に封口部材及び絶縁ガスケットを載置する工程と、前記容器の開口端付近を縮径する工程と、前記容器の下部を下型の矩形穴内に挿入した状態で前記容器の開口端を内方に折り曲げることにより前記容器の開口端付近に前記封口部材を取付ける工程とを具備し、
前記下型は、前記矩形穴がその底部内面から長辺側内周面につながる立上った部分の曲率半径をＲ1とし、底部内面から短辺側内周面につながる立上った部分の曲率半径をＲ2とし、底部内面からコーナにつながる立上った部分の曲率半径をＲ3とした時に次式
Ｒ3≧Ｒ2＞Ｒ1 （２）
を満たす構造を有し、
前記曲率半径Ｒ 1 は、前記容器の底面から長辺側側面につながる立上った部分の曲率半径ｒ 1 よりも小さく、
前記曲率半径Ｒ 2 は、前記容器の底面から短辺側側面につながる立上った部分の曲率半径ｒ 2 と等しいことを特徴とするものである。
【０００９】
前記容器は、コーナ部の肉厚が厚く、かつ底部からコーナにつながる立上った部分の曲率半径が小さい構造を有することが好ましい。このような容器は底部の強度を向上できる。
【００１０】
前記容器は底面から長辺側側面の中央部につながる立上った部分の曲率半径（ｒ１ ）が０．４ｍｍ〜０．９ｍｍで、底面から短辺側側面につながる立上った部分の曲率半径（ｒ２ ）が０．６ｍｍ〜１．０ｍｍで、底面からコーナにつながる立上った部分の曲率半径（ｒ３ ）が１．０ｍｍ〜１．３ｍｍである構造に作製される場合が多い。このため、前記下型は、前記曲率半径Ｒ２ を０．８ｍｍとした時に、前記曲率半径Ｒ１ が０．７ｍｍ以下で、かつ前記曲率半径Ｒ３ が１．０ｍｍ〜１．３ｍｍである構造にすることが好ましい。特に、前記曲率半径Ｒ３ が前記容器の前記曲率半径ｒ３ と等しい構造を有する下型を用いることが好ましい。このような下型は、前記容器が挿入された際に前記容器の底面からコーナ及び短辺側側面につながる立上った部分が前記矩形穴の底部内面からコーナ及び短辺側内周面につながる立上った部分に嵌合される。その結果、折り曲げ工程において前記容器の底面からコーナ及び短辺側側面につながる立上った部分により前記容器を強固に支持することができるため、前記曲率半径Ｒ３ が前記曲率半径ｒ３ と異なる構造を有する下型を用いる場合に比べて前記容器が変形するのを防止する効果が高く、前記容器に封口部材を更に気密性良く取付けることができる。
【００１１】
【作用】
本発明の角形電池の製造方法によれば、折り曲げ工程において、矩形穴が形成され、かつ前記矩形穴がその底部内面から長辺側の内周面につながる立上った部分の曲率半径をＲ１ とし、底部内面から短辺側の内周面につながる立上った部分の曲率半径をＲ２ とし、底部内面からコーナにつながる立上がった部分の曲率半径をＲ３ とした時に前記（２）式を満たす構造を有する下型を用い、容器の下部を前記下型の前記矩形穴に挿入する。その結果、前記容器は、その底面から短辺側側面につながる立上った部分が前記矩形穴の底部内面から短辺側内周面につながる立上った部分に嵌合され、かつ底面から長辺側側面につながる立上った部分が前記矩形穴の底部内面から長辺側内周面につながる立上った部分から所望の距離を隔てて配置された状態で前記下型に固定される。この状態で前記容器の開口端を折り曲げると、前記容器に押圧力がかかって前記容器の底面から短辺側側面につながる立上った部分に負荷がかかるが、この部分は強度が高いため、変形することなく前記容器を支持することができる。また、前記容器の底面から長辺側側面につながる立上った部分と前記矩形穴の底部内面から長辺側内周面につながる立上った部分との間には隙間があるため、前記容器に座屈変形が生じるのを防止することができる。その結果、前記容器の開口端を所望の角度で折り曲げて封口部材を気密性良く取付けることができるため、前記電池の気密性及び信頼性を向上することができる。
【００１２】
【実施例】
以下、本発明の実施例を図面を参照して詳細に説明する。
実施例１
まず、実施例１において用いられる絞り金型、縮径工程用下型、カール金型及び折り曲げ工程用下型について図１〜図８を参照して説明する。
【００１３】
図１及び図２において、縮径工程用下型１はその角形穴２内に後述する容器の下部を固定する。前記下型１は、前記容器が載置された際に前記角形穴２の底部内面から長辺側内周面につながる立上った部分と前記容器の底面から長辺側側面につながる立上った部分とが嵌合されるような構造を有する。矩形筒状の中空部３が中央部に設けられ、かつ下端内周面４が外側に拡口された上下動自在な絞り金型５は前記下型１の上方に配置されている。下部周縁に矩形枠状突起部６が形成されたナックアウト７は、前記中空部３を上下動する。
【００１４】
図３及び図４において、折り曲げ工程用下型８は後述する容器の下部を固定する。前記下型８は図５に示すように、矩形の穴９が設けられ、下部に前記矩形穴９と連通する矩形筒状の中空部１０が形成されている。ナックアウト１１は、前記中空部１０及び前記矩形穴９を上下動する。前記下型８は、図６に示すように底部内面から長辺側内周面につながる立上った部分の曲率半径（Ｒ１ ）が０．４ｍｍで、図７に示すように底部内面から短辺側内周面につながる立上った部分の曲率半径（Ｒ２ ）が０．８ｍｍで、図８に示すように底部内面からコーナにつながる立上がった部分の曲率半径（Ｒ３ ）が０．８ｍｍである。従って、これらの曲率半径Ｒ１ ，Ｒ２ ，Ｒ３ は、前述した（２）式を満たす。矩形筒状の中空部１２が中央部に設けられ、かつ底部に前記中空部１２と連通すると共に前記中空部１２より寸法の大きい角形凹部１３が形成された上下動自在なカール金型１４は前記下型８の上方に配置されている。下部周縁に矩形枠状突起部１５が形成されたナックアウト１６は、前記中空部１２及び前記凹部１３を上下動する。
【００１５】
次に、角形電池の製造方法を詳細に説明する。
まず、図９に示すように開口端付近に段部１７ａが形成された有底矩形筒状容器１７を用意した。前記容器１７は、鋼板から深絞り成形によって有底矩形筒状に成形された後、開口端付近が拡口されて段部が形成されることにより作製された。前記容器１７は、板厚が０．４ｍｍで、長手方向側の幅が１６．４ｍｍである。また、前記容器は、図１０に示すように底面から長辺側側面の中央部につながる立上った部分の曲率半径（ｒ１ ）が０．７ｍｍで、図１１に示すように底面から短辺側側面につながる立上った部分の曲率半径（ｒ２ ）が０．８ｍｍで、図１２に示すように底面からコーナにつながる立上った部分の曲率半径（ｒ３ ）が１．３０ｍｍである。
【００１６】
このような形状の容器１７内に図１に示すように正極リード１８が接続された正極１９と負極２０との間にセパレータ２１を介装して作製された電極群２２を収納した後、電解液を注液した。つづいて、防爆機能及び端子を兼ねる封口部材２３を用意した。前記封口部材２３は、中央にガス抜き孔２４を有する封口板２５と、前記封口板２５にそのガス抜き孔２４を囲むように載置されたガス通過孔（図示しない）を有する端子キャップ２６と、前記端子キャップ２６と前記封口板２５との間に前記ガス抜き孔２４を覆うように配置された弾性弁体２７とから構成されている。前記封口部材２３を底部に矩形貫通穴を有する有底矩形筒状の絶縁ガスケット２８内に載置し、前記封口部材２３の前記封口板２５の下面に前記正極リード１８の先端を溶接した後、前記絶縁ガスケット２８を前記容器１７の段部１７ａに載置した。その後、前記容器１７を前記下型１の前記角形穴２に載置し、前記絞り金型５を前記容器１７の上方に配置した。
【００１７】
次いで、前述した図２に示すように前記絞り金型５を下降させ前記ナックアウト７の前記突起部６で前記容器１７の開口端を押さえながら前記絞り金型５を前記容器１７の開口端付近に挿入することにより、前記容器１７の開口端付近を縮径し、前記容器１７の前記段部１７ａを内方に突出させた。つづいて、前記絞り金型５を上昇させながら前記ナックアウト７の前記突起部６で前記容器１７の開口端を押圧して前記絞り金型５を前記容器１７から取り外した後、前記容器１７から前記下型１を取り外した。前記容器１７を前記下型８の前記矩形穴９内に載置した。前記下型８の前記曲率半径Ｒ１ ，Ｒ２ ，Ｒ３ は前述した（２）式を満たす。このため、前記容器１７は前述した図３に示すように、その底面から短辺側側面につながる立上った部分が前記矩形穴９の底部内面から短辺側内周面につながる立上った部分に嵌合され、かつ図１３に示すように底面から長辺側側面につながる立上った部分が前記矩形穴９の底部内面から長辺側内周面につながる立上った部分から所望の距離を隔てて配置された状態で前記下型８に固定された。ひきつづき、前記カール金型１４を前記容器１７上方に配置した。
【００１８】
次いで、前述した図４に示すように前記カール金型１４を下降させて前記ナックアウト１６の前記突起部１５で前記封口板２５を押さえながら前記カール金型１４の前記凹部１３の内周面と前記容器１７の開口端を当接させた。これにより前記容器１７に押圧力が加わって前記容器１７の底面から短辺側側面につながる立上った部分に負荷がかかるが、短辺側側面は強度が高いために変形せず、前記底面から短辺側側面につながる立上った部分によって前記容器１７が支持された。また、前述した図１３に示すように前記容器１７の底面から長辺側側面につながる立上った部分と前記矩形穴９の底部内面から長辺側内周面につながる立上った部分とには隙間があるため、前記容器１７の長辺側の下部側面に変形が生じなかった。その結果、前記容器１７の底部からコーナにつながる立上がった部分がわずかにつぶれたものの、前記容器１７の開口端が所望の角度で内方に折り曲げられて、前記容器１７の開口端付近に前記封口部材２３が気密性良く取付けられた。この後、前記カール金型１４を上昇させながら前記ナックアウト１６の前記突起部１５で前記封口板２５上面を押すことにより前記カール金型１４を前記容器１７から取り外した後、前記下型８の前記ナックアウト１１を上昇させることにより前記下型８から前記容器１７を取り外し、図１４に示す角形電池を製造した。
実施例２
実施例１と同様な容器に実施例１と同様な電極群及び電解液を収納し、実施例１と同様な防爆機能及び端子を兼ねる封口部材を絶縁ガスケットに収納し、この絶縁ガスケットを前記容器の段部に載置した。なお、正極リードは、一端が正極に接続され、かつ他端が前記封口部材の封口板の下面に接続されている。前記容器の開口端付近を実施例１と同様な方法により縮径した。つづいて、前記曲率半径Ｒ１ が０．４ｍｍで、前記曲率半径Ｒ２ が０．８ｍｍで、前記曲率半径Ｒ３ が１．３ｍｍである以外は実施例１と同様な折り曲げ工程用下型を用い、前記容器を前記下型の前記矩形穴内に載置した。前記下型の前記矩形穴は前記（２）式を満たす形状である。このため、前記容器は、底面からコーナ及び短辺側側面につながる立上った部分が前記矩形穴の底部内面からコーナ及び短辺側内周面につながる立上った部分に嵌合され、かつ底面から長辺側側面につながる立上った部分が前記矩形穴の底部内面から長辺側内周面につながる立上った部分から所望の距離を隔てて配置された状態で前記下型に固定された。この容器の開口端に実施例１と同様なカール金型を当接させて前記開口端を内方に折り曲げたところ、前記容器はその底部からコーナ及び短辺側側面につながる立上った部分により強固に支持されたため、前記容器には変形が生じなかった。その結果、前記容器に前記封口部材を実施例１に比べて更に気密性良く取付けることができた。
比較例
前記折り曲げ工程において、矩形穴の底部内面から側面全周につながる立上った部分の曲率半径が０．６ｍｍであること以外は実施例１と同様な折り曲げ工程用下型を用いて実施例１と同様な方法により角形電池を製造した。その結果、折り曲げ工程において容器に座屈変形が生じて前記容器の長辺側の下部側面が凹み、前記容器の開口端の折り曲げ角度が実施例１，２に比べて浅いことが確認できた。
【００１９】
なお、前記実施例では、折り曲げ工程においてナックアウトを有する下型を用いたが、ナックアウトを持たない下型を折り曲げ工程で用いても良い。
前記実施例では、縮径工程において容器を下型に載置した際に、前記容器の底面から長辺側側面につながる立上った部分が角形穴の底部内面から長辺側内周面につながる立上った部分に嵌合される下型を用いたが、曲率半径Ｒ１ ，Ｒ２ ，Ｒ３ が前記（２）式を満たす形状の矩形穴を有する下型を縮径工程において用いても良い。
【００２０】
【発明の効果】
以上詳述したように本発明の角形電池の製造方法によれば、折り曲げ工程において容器に変形を生じさせることなく前記容器を下型により支持することができ、前記容器の開口端を所望の角度で内方に折り曲げて前記開口端付近に封口部材を気密性良く取付けることができ、角形電池の気密性及び信頼性を向上することができるという顕著な効果を奏する。
【図面の簡単な説明】
【図１】本発明の角形電池の製造工程を示す断面図。
【図２】本発明の角形電池の製造工程を示す断面図。
【図３】本発明の角形電池の製造工程を示す断面図。
【図４】本発明の角形電池の製造工程を示す断面図。
【図５】図３の下型の上面図。
【図６】図５のＡ−Ａ線に沿う断面図。
【図７】図５のＢ−Ｂ線に沿う断面図。
【図８】図５のＣ−Ｃ線に沿う断面図。
【図９】本発明の方法により製造される角形電池に用いられる容器を示す斜視図。
【図１０】図９のＤ−Ｄ線に沿う断面図。
【図１１】図９のＥ−Ｅ線に沿う断面図。
【図１２】図９のＦ−Ｆ線に沿う断面図。
【図１３】図３の下型の矩形穴に角形電池の容器の下部が挿入された状態を示す縦断面図。
【図１４】本発明の方法により製造された角形電池を示す断面図。
【符号の説明】
８…下型、９…矩形穴、１０…中空部、１１…ナックアウト、１４…カール金型、１６…ナックアウト、１７…容器、１９…正極、２０…負極、２１…セパレータ、２２…電極群、２３…封口部材、２８…絶縁ガスケット。[0001]
[Industrial applications]
The present invention relates to a method for manufacturing a prismatic battery in which a sealing member is attached by caulking and fixing near an open end of a bottomed rectangular cylindrical container.
[0002]
[Prior art]
2. Description of the Related Art In recent years, with the reduction in size and weight of devices, prismatic batteries with high volumetric efficiency have been developed. A prismatic nickel-metal hydride secondary battery, which is an example of the prismatic battery, is an electrode manufactured by interposing a synthetic resin fiber separator between a nickel positive electrode and a hydrogen storage alloy negative electrode in a bottomed rectangular cylindrical container. The container has a structure in which a group and an alkaline electrolyte are accommodated, and a sealing plate is attached near an opening end of the container. As a method of attaching a sealing plate near the opening end of the container, the following caulking fixation is known. First, a rectangular cylindrical container with a bottom having a step formed by expanding the vicinity of the opening end is prepared. After the electrode group is accommodated in the container and the electrolytic solution is accommodated, a bottomed rectangular cylindrical insulating gasket having a rectangular hole at the bottom where the sealing plate is accommodated in advance is placed. The sealing plate is attached near the opening end of the container by reducing the diameter near the opening end of the container and bending the opening end of the container inward.
[0003]
In the step of bending the open end of the container, a lower mold having a rectangular hole and a curl mold having a rectangular recess disposed above the lower mold are used. By the way, the thickness of the container is set to about 0.4 mm in order to suppress the surface on the longitudinal direction from curving outward when gas is generated and the internal pressure rises. A container having such a thickness is manufactured by deep drawing a steel plate of 0.45 mm to 0.5 mm by a multi-stage press. For this reason, it is difficult to manufacture the container so that the radius of curvature of the rising portion connected from the bottom surface to the side surface is uniform over the entire circumference. The radius of curvature of the bottom surface from the standing up part connected to the long side face of the container as r 1, the radius of curvature of the standing up portions extending from the bottom surface in the short side face and r 2, which leads to the corner from the bottom When the radius of curvature of the rising portion is r 3 , the container has the radius of curvature r 3 > r 2 ≧ r 1 (1)
Tend to be produced in a shape that satisfies the following conditions. Moreover, the radius of curvature r 1 of the container tends to have a portion located in the central portion becomes the smallest. On the other hand, conventionally, the rectangular hole of the lower mold has a shape in which a radius of curvature of a rising portion extending from the bottom inner surface to the entire inner peripheral surface is rising from a bottom surface of the container to a central portion of a long side surface. It had a shape that was equal to the radius of curvature of the part that was bent.
[0004]
When the lower portion of the container having such a shape is inserted into the lower rectangular hole, a rising portion connecting from the bottom surface of the container to the long side surface is formed from the bottom inner surface of the rectangular hole to the long side inner peripheral surface. And the container is fixed to the lower mold. Next, when the opening end of the container is brought into contact with the inner peripheral surface of the concave portion of the mold to bend the opening end of the container inward, a pressing force is applied to the container. When a pressing force is applied to the container, the container deforms so that the radius of curvature of a rising portion connected from the bottom surface to the entire side surface is reduced so as to balance the pressing force. However, there is no extra space between the raised portion connecting from the bottom surface of the container to the long side surface and the raised portion connecting from the bottom inner surface of the rectangular hole to the long side inner peripheral surface. Therefore, the deformation that the radius of curvature becomes small cannot be performed, and a load is applied to this portion of the container. In addition, the strength of the container with respect to the pressing force decreases in the order of the corner, the short side, and the long side. For this reason, when such a load is applied to a rising portion connecting the bottom surface of the container to the side surface on the long side, buckling deformation occurs in the container, and a recess is formed on the lower side surface on the long side of the container. There is a problem that occurs. When such deformation occurs in the container, even if the mold is used to press the open end of the container to bend the open end of the container inward, the open end does not bend to a desired angle. There was a problem. As a result, the hermeticity of the secondary battery is reduced. For example, when gas is generated due to overcharging and the internal pressure of the battery is increased, the surface in the longitudinal direction located near the opening end of the container is exposed by the gas pressure. And there is a problem that a gap is formed between the opening end on the longitudinal direction side of the container and the insulating gasket to cause gas leakage.
[0005]
Further, the radius of curvature of a rising portion connected from the bottom inner surface of the rectangular hole to the entire inner peripheral surface as the lower die is larger than the radius of curvature of the rising portion connected from the bottom surface of the container to the center of the long side surface. When a container having a large structure is used, a rising portion connected from the bottom surface of the container to the center of the long side surface is located at the center of the long side of the rising portion of the rectangular hole. Abutted on the part. In this state, if the opening end of the container is bent inward by the mold, a load is applied to a rising portion connected from the bottom surface of the container to the center of the long side surface. There is a problem that the central portion of the lower side surface is deformed.
[0006]
On the other hand, the radius of curvature of the rising portion connected from the bottom inner surface of the rectangular hole to the entire inner peripheral surface as the lower die is larger than the radius of curvature of the rising portion connected from the bottom surface of the container to the center of the long side surface. When the bending step is performed using a container having a small structure, the container deforms such that the radius of curvature of the rising portion connected from the bottom surface to the entire periphery of the side surface becomes small until the container is balanced with the pressing force applied at this time. In this deformation, the rising portion connected from the bottom surface of the container to the center of the long side surface cannot follow the deformation of the rising portion connected to the corner from the bottom surface of the container. There is a problem that the central portion of the lower side surface is deformed.
[0007]
[Problems to be solved by the invention]
An object of the present invention is to prevent a rectangular cylindrical container having a bottom from being deformed, to bend the open end of the container inward at a desired angle, and to attach a sealing member to the vicinity of the open end with good airtightness. It is an object of the present invention to provide a method of manufacturing a prismatic battery having a bending process capable of performing the bending.
[0008]
[Means for Solving the Problems]
The method for manufacturing a prismatic battery of the present invention is manufactured by interposing a separator between a positive electrode and a negative electrode in a bottomed rectangular cylindrical container having a step formed by expanding the vicinity of an open end. Accommodating the group of electrodes, accommodating an electrolytic solution in the container, placing a sealing member and an insulating gasket on the step of the container, and reducing the diameter of the vicinity of the opening end of the container. And the step of attaching the sealing member near the open end of the container by bending the open end of the container inward with the lower portion of the container inserted into the lower rectangular hole,
The lower die has a radius of curvature R 1 of a portion where the rectangular hole rises from the bottom inner surface to the long side inner peripheral surface, and a rising portion connecting the bottom inner surface to the short side inner peripheral surface. Where R 2 is the radius of curvature and R 3 is the radius of curvature of the rising portion from the bottom inner surface to the corner, where R 3 ≧ R 2 > R 1 (2)
Have a structure that satisfies the,
The curvature radius R 1 is smaller than the curvature radius r 1 of a rising portion connected from the bottom surface of the container to the long side surface ,
The radius of curvature R 2 is characterized in that equal from the bottom of the container and the radius of curvature r 2 of the standing up part leading to the short side face.
[0009]
It is preferable that the container has a structure in which a corner portion has a large thickness and a radius of curvature of a rising portion connected to the corner from the bottom is small. Such a container can improve the strength of the bottom.
[0010]
The container has a radius of curvature (r 1 ) of 0.4 mm to 0.9 mm at a rising portion connected from the bottom surface to the central portion of the long side surface, and a rising portion connected to the short side surface at the bottom surface. A structure in which the radius of curvature (r 2 ) is 0.6 mm to 1.0 mm, and the radius of curvature (r 3 ) of the rising portion connected to the corner from the bottom surface is 1.0 mm to 1.3 mm may be produced. Many. Therefore, the lower die, the curvature radius R 2 when a 0.8 mm, the radius of curvature R 1 is at 0.7mm or less, and the radius of curvature R 3 is 1.0mm~1.3mm structure Is preferable. In particular, it is preferable to use a lower mold in which the radius of curvature R 3 have equal structure and the radius of curvature r 3 of the container. Such a lower mold is such that when the container is inserted, a rising portion connecting from the bottom surface of the container to the corner and the short side surface is from the bottom inner surface of the rectangular hole to the corner and the short side inner surface. It is fitted to the connected rising part. As a result, bending the order of the container by corner and the short side was standing up leading to side portions of the bottom surface of the container can be firmly supported in the process, the radius of curvature R 3 is different from the radius of curvature r 3 As compared with the case where a lower mold having a structure is used, the effect of preventing the container from being deformed is high, and the sealing member can be more airtightly attached to the container.
[0011]
[Action]
According to the method for manufacturing a prismatic battery of the present invention, in the bending step, a rectangular hole is formed, and the rectangular hole has a radius of curvature of a rising portion connected from the bottom inner surface to the long side inner circumferential surface. 1, and the radius of curvature of the inner peripheral surface standing up portions leading to the short side from the inner bottom surface and R 2, the radius of curvature of the portion rises leading to the corner from the inner bottom surface when the R 3 (2 Using a lower mold having a structure that satisfies the formula, insert the lower part of the container into the rectangular hole of the lower mold. As a result, the container has a rising portion connected to the short side surface from the bottom surface fitted to a rising portion connected to the short side inner peripheral surface from the bottom inner surface of the rectangular hole, and from the bottom surface. The raised part connected to the long side surface is fixed to the lower mold in a state where the raised part connected to the long inner surface from the bottom inner surface of the rectangular hole is separated by a desired distance. You. When the open end of the container is bent in this state, a load is applied to a rising portion connected to the short side surface from the bottom surface of the container due to a pressing force applied to the container, but since this portion has high strength, The container can be supported without deformation. Further, since there is a gap between a rising portion connected to the long side surface from the bottom surface of the container and a rising portion connected to the long side inner peripheral surface from the bottom inner surface of the rectangular hole, Buckling deformation of the container can be prevented. As a result, since the opening end of the container can be bent at a desired angle and the sealing member can be attached with good airtightness, the airtightness and reliability of the battery can be improved.
[0012]
【Example】
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Example 1
First, a drawing die, a lower die for a diameter reduction step, a curl die, and a lower die for a bending step used in Example 1 will be described with reference to FIGS.
[0013]
In FIGS. 1 and 2, a lower die 1 for a diameter reducing process fixes a lower portion of a container described later in a rectangular hole 2. The lower mold 1 has a rising portion connected from the bottom inner surface of the square hole 2 to the long side inner peripheral surface when the container is placed, and a rising portion connected to the long side surface from the bottom surface of the container. It has a structure that fits with the fitting part. A vertically movable die 5 having a rectangular cylindrical hollow portion 3 provided in the center and a lower end inner peripheral surface 4 expanded outward is disposed above the lower die 1. A knockout 7 having a rectangular frame-shaped projection 6 formed on the lower peripheral edge moves up and down the hollow portion 3.
[0014]
3 and 4, a lower die 8 for a bending process fixes a lower portion of a container described later. As shown in FIG. 5, the lower die 8 is provided with a rectangular hole 9, and a rectangular cylindrical hollow portion 10 communicating with the rectangular hole 9 is formed at a lower portion. The knockout 11 moves up and down the hollow portion 10 and the rectangular hole 9. The lower mold 8 has a radius of curvature (R 1 ) of 0.4 mm at a rising portion connected from the inner surface of the bottom to the inner peripheral surface on the long side as shown in FIG. 6, and from the inner surface of the bottom as shown in FIG. The radius of curvature (R 2 ) of the rising portion connected to the inner peripheral surface on the short side is 0.8 mm, and the radius of curvature (R 3 ) of the rising portion connected to the corner from the bottom inner surface is 0.8 mm as shown in FIG. 0.8 mm. Therefore, these radii of curvature R 1 , R 2 , and R 3 satisfy the above-described equation (2). A vertically movable curl mold 14 in which a rectangular cylindrical hollow portion 12 is provided at a central portion, and a rectangular recess 13 having a size larger than the hollow portion 12 communicating with the hollow portion 12 at the bottom portion is formed. It is arranged above the lower die 8. A knuckout 16 having a rectangular frame-shaped projection 15 formed on a lower periphery moves up and down the hollow portion 12 and the concave portion 13.
[0015]
Next, a method for manufacturing a prismatic battery will be described in detail.
First, a bottomed rectangular cylindrical container 17 having a stepped portion 17a formed near the opening end as shown in FIG. 9 was prepared. The container 17 was manufactured by forming a rectangular tube with a bottom from a steel plate by deep drawing and then expanding the vicinity of the opening end to form a step. The container 17 has a plate thickness of 0.4 mm and a width in the longitudinal direction of 16.4 mm. The container has a radius of curvature (r 1 ) of 0.7 mm at a rising portion connected from the bottom surface to the center of the long side surface as shown in FIG. 10, and is short from the bottom surface as shown in FIG. The radius of curvature (r 2 ) of the rising portion connected to the side surface is 0.8 mm, and the radius of curvature (r 3 ) of the rising portion connected to the corner from the bottom surface is 1.30 mm as shown in FIG. It is.
[0016]
As shown in FIG. 1, an electrode group 22 produced by interposing a separator 21 between a positive electrode 19 and a negative electrode 20 to which a positive electrode lead 18 is connected as shown in FIG. The solution was injected. Subsequently, a sealing member 23 having an explosion-proof function and a terminal was prepared. The sealing member 23 includes a sealing plate 25 having a gas vent hole 24 in the center, and a terminal cap 26 having a gas passage hole (not shown) mounted on the sealing plate 25 so as to surround the gas vent hole 24. And an elastic valve body 27 disposed between the terminal cap 26 and the sealing plate 25 so as to cover the gas vent hole 24. After the sealing member 23 is placed in a bottomed rectangular cylindrical insulating gasket 28 having a rectangular through hole at the bottom, and the tip of the positive electrode lead 18 is welded to the lower surface of the sealing plate 25 of the sealing member 23, The insulating gasket 28 was placed on the step 17a of the container 17. After that, the container 17 was placed in the square hole 2 of the lower mold 1, and the drawing die 5 was arranged above the container 17.
[0017]
Next, as shown in FIG. 2 described above, the drawing die 5 is lowered and the drawing die 5 is moved to the vicinity of the opening end of the container 17 while holding the opening end of the container 17 with the projection 6 of the nack-out 7. Then, the diameter of the vicinity of the opening end of the container 17 was reduced, and the step portion 17a of the container 17 was protruded inward. Then, while raising the drawing die 5, the protrusion 6 of the nack-out 7 presses the opening end of the container 17 to remove the drawing die 5 from the container 17. The lower mold 1 was removed. The container 17 was placed in the rectangular hole 9 of the lower die 8. The radii of curvature R 1 , R 2 , R 3 of the lower die 8 satisfy the above-described equation (2). Therefore, as shown in FIG. 3 described above, the container 17 rises from the bottom surface to the short side surface from the bottom inner surface of the rectangular hole 9 to the short side inner surface. 13, and a rising portion connected from the bottom surface to the long side surface from the bottom surface of the rectangular hole 9 is connected to a long side inner peripheral surface as shown in FIG. It was fixed to the lower die 8 while being arranged at a desired distance. Subsequently, the curl mold 14 was disposed above the container 17.
[0018]
Next, as shown in FIG. 4 described above, the curl mold 14 is lowered, and the inner peripheral surface of the concave portion 13 of the curl mold 14 is pressed while pressing the sealing plate 25 with the protrusions 15 of the nack-out 16. The open end of the container 17 was brought into contact. As a result, a pressing force is applied to the container 17 and a load is applied to a rising portion connected from the bottom surface of the container 17 to the short side surface, but the short side surface is not deformed due to high strength, and the bottom surface is not deformed. The container 17 was supported by a rising portion connected to the short side surface. Further, as shown in FIG. 13 described above, a rising portion connecting from the bottom surface of the container 17 to the long side surface and a rising portion connecting from the bottom inner surface of the rectangular hole 9 to the long side inner peripheral surface. Since there was a gap in the container 17, no deformation occurred on the lower side surface on the long side of the container 17. As a result, although the rising portion leading to the corner from the bottom of the container 17 is slightly crushed, the opening end of the container 17 is bent inward at a desired angle, and the vicinity of the opening end of the container 17 is close to the opening end. The sealing member 23 was attached with good airtightness. Thereafter, the curl mold 14 is removed from the container 17 by pushing the upper surface of the sealing plate 25 with the protrusion 15 of the nack-out 16 while raising the curl mold 14, and then the lower mold 8 is The container 17 was removed from the lower mold 8 by raising the knuckout 11, and the prismatic battery shown in FIG. 14 was manufactured.
Example 2
The same electrode group and electrolytic solution as in Example 1 were stored in the same container as in Example 1, and a sealing member having the same explosion-proof function and terminal as in Example 1 was stored in an insulating gasket. Was placed on the step. The positive electrode lead has one end connected to the positive electrode and the other end connected to the lower surface of the sealing plate of the sealing member. The vicinity of the opening end of the container was reduced in diameter in the same manner as in Example 1. Subsequently, in the radius of curvature R 1 is 0.4 mm, with the radius of curvature R 2 is 0.8 mm, the same bending lower-die process as in Example 1 except the radius of curvature R 3 is 1.3mm For use, the container was placed in the rectangular hole of the lower mold. The rectangular hole of the lower die has a shape satisfying the expression (2). For this reason, the container, a rising portion connected from the bottom surface to the corner and the short side surface is fitted to a rising portion connected to the corner and the short side inner surface from the bottom inner surface of the rectangular hole, The lower mold is in a state where a rising portion connected to the long side surface from the bottom surface is arranged at a desired distance from a rising portion connected to the long side inner peripheral surface from the bottom inner surface of the rectangular hole. Fixed to. When the same curl mold as in Example 1 was brought into contact with the open end of this container and the open end was bent inward, the container was raised from its bottom to a corner and a short side surface. , The container was not firmly deformed. As a result, the sealing member could be attached to the container more airtightly than in Example 1.
Comparative Example The bending step was performed using the same lower die for the bending step as in Example 1 except that the radius of curvature of the rising portion from the bottom inner surface of the rectangular hole to the entire periphery of the side surface was 0.6 mm. A prismatic battery was manufactured in the same manner as in Example 1. As a result, it was confirmed that buckling deformation occurred in the container in the bending step, the lower side surface on the long side of the container was dented, and the bending angle of the open end of the container was smaller than in Examples 1 and 2.
[0019]
In the above embodiment, a lower mold having a knuckout is used in the bending step, but a lower mold having no knuckout may be used in the bending step.
In the above embodiment, when the container is placed on the lower mold in the diameter reducing step, the rising portion connected from the bottom surface of the container to the long side surface is from the bottom inner surface of the rectangular hole to the long side inner peripheral surface. Although the lower die fitted to the connected rising portion was used, the lower die having a rectangular hole having a radius of curvature R 1 , R 2 , R 3 satisfying the above formula (2) was used in the diameter reduction step. May be.
[0020]
【The invention's effect】
As described in detail above, according to the method for manufacturing a prismatic battery of the present invention, the container can be supported by the lower mold without causing deformation of the container in the bending step, and the opening end of the container can be formed at a desired angle. Thus, it is possible to bend inward and attach the sealing member in the vicinity of the opening end with good airtightness, and there is a remarkable effect that the airtightness and reliability of the prismatic battery can be improved.
[Brief description of the drawings]
FIG. 1 is a sectional view showing a manufacturing process of a prismatic battery of the present invention.
FIG. 2 is a sectional view showing a manufacturing process of the prismatic battery of the present invention.
FIG. 3 is a sectional view showing a manufacturing process of the prismatic battery of the present invention.
FIG. 4 is a sectional view showing a manufacturing process of the prismatic battery of the present invention.
FIG. 5 is a top view of the lower mold of FIG. 3;
FIG. 6 is a sectional view taken along line AA of FIG. 5;
FIG. 7 is a sectional view taken along the line BB of FIG. 5;
FIG. 8 is a sectional view taken along the line CC of FIG. 5;
FIG. 9 is a perspective view showing a container used for a prismatic battery manufactured by the method of the present invention.
FIG. 10 is a sectional view taken along the line DD in FIG. 9;
FIG. 11 is a sectional view taken along the line EE in FIG. 9;
FIG. 12 is a sectional view taken along the line FF of FIG. 9;
FIG. 13 is a longitudinal sectional view showing a state where the lower part of the rectangular battery container is inserted into the lower rectangular hole of FIG. 3;
FIG. 14 is a cross-sectional view showing a prismatic battery manufactured by the method of the present invention.
[Explanation of symbols]
8 lower die, 9 rectangular hole, 10 hollow part, 11 knuck out, 14 curl mold, 16 knuck out, 17 container, 19 positive electrode, 20 negative electrode, 21 separator, 22 electrode Group 23 sealing member 28 insulating gasket.

Claims (1)

開口端付近を拡口することにより形成された段部を有する有底矩形筒状の容器内に正極と負極との間にセパレータを介装して作製された電極群を収納する工程と、
前記容器内に電解液を収容する工程と、
前記容器の前記段部上に封口部材及び絶縁ガスケットを載置する工程と、
前記容器の開口端付近を縮径する工程と、
前記容器の下部を下型の矩形穴内に挿入した状態で前記容器の開口端を内方に折り曲げることにより前記容器の開口端付近に前記封口部材を取付ける工程とを具備し、
前記下型は、前記矩形穴がその底部内面から長辺側内周面につながる立上った部分の曲率半径をＲ1とし、底部内面から短辺側内周面につながる立上った部分の曲率半径をＲ2とし、底部内面からコーナにつながる立上った部分の曲率半径をＲ3とした時に式Ｒ3≧Ｒ2＞Ｒ1を満たす構造を有し、
前記曲率半径Ｒ 1 は、前記容器の底面から長辺側側面につながる立上った部分の曲率半径ｒ 1 よりも小さく、
前記曲率半径Ｒ 2 は、前記容器の底面から短辺側側面につながる立上った部分の曲率半径ｒ 2 と等しいことを特徴とする角形電池の製造方法。A step of accommodating an electrode group produced by interposing a separator between a positive electrode and a negative electrode in a bottomed rectangular cylindrical container having a step formed by expanding the vicinity of the open end,
A step of containing an electrolytic solution in the container,
Placing a sealing member and an insulating gasket on the step of the container,
A step of reducing the diameter near the open end of the container,
Attaching the sealing member near the open end of the container by bending the open end of the container inward with the lower part of the container inserted into the lower rectangular hole,
The lower die has a radius of curvature R 1 of a portion where the rectangular hole rises from the bottom inner surface to the long side inner peripheral surface, and a rising portion connecting the bottom inner surface to the short side inner peripheral surface. the radius of curvature and R 2, the radius of curvature of the standing up part connected to the corner from the bottom inner surface have a structure satisfying formula R 3 ≧ R 2> R 1 when the R 3 of,
The curvature radius R 1 is smaller than the curvature radius r 1 of a rising portion connected from the bottom surface of the container to the long side surface ,
The radius of curvature R 2 is The method of prismatic battery, characterized in that equal from the bottom of the container and the radius of curvature r 2 of the standing up part leading to the short side face.
JP30604694A 1994-12-09 1994-12-09 Method of manufacturing prismatic battery Expired - Fee Related JP3599391B2 (en)

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JP3604879B2 (en) * 1997-08-05 2004-12-22 松下電器産業株式会社 Battery manufacturing method
KR100471166B1 (en) * 1997-09-08 2005-03-07 마츠시타 덴끼 산교 가부시키가이샤 Battery and method of manufacturing the same

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