JP3573930B2 - Manufacturing method of sealed alkaline storage battery - Google Patents

Manufacturing method of sealed alkaline storage battery Download PDF

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JP3573930B2
JP3573930B2 JP29873497A JP29873497A JP3573930B2 JP 3573930 B2 JP3573930 B2 JP 3573930B2 JP 29873497 A JP29873497 A JP 29873497A JP 29873497 A JP29873497 A JP 29873497A JP 3573930 B2 JP3573930 B2 JP 3573930B2
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sealing gasket
sealing
storage battery
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gasket
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JPH11135087A (en
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尚 垣内
一男 松脇
薫 西岡
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Sanyo Electric Co Ltd
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    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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Description

【０００１】
【発明の属する技術分野】
この発明は、有底筒状の金属製外装缶の開口部端縁を封口ガスケットを介して封口蓋の方向にカシメて密封する密閉型アルカリ蓄電池の製造方法に係わり、特に、その封口ガスケットの改質を図る方法に関するものである。
【０００２】
【従来の技術】
ニッケル−カドミウム蓄電池、ニッケル−水素化物蓄電池などの密閉型アルカリ蓄電池は、少なくとも正・負極板からなる発電要素を収納した有底筒状の金属製外装缶の開口部に封口ガスケットと封口蓋とを載置し、外装缶の開口部端縁を封口ガスケットを介して封口蓋の方向にカシメて密封して製造するのが一般的である。この種の密閉型アルカリ蓄電池にとって、重要な課題の１つは、如何にして耐漏液性を向上させるかである。
【０００３】
このため、封口ガスケットの材質の選択が重要になるが、現在、封口ガスケットの材質としては、機械的強度、耐熱性、耐寒性、耐圧性、耐油性などにおいて優れた特性を有するナイロンが広く用いられている。そして、この封口ガスケットはクリーピングによる電解液の漏液防止のために、アスファルトを有機溶剤に溶解させたシール剤を塗布して用いられている。一方、ナイロンは吸湿性を有するため、周囲環境により特性が大きく変化する。このため、封口ガスケットの気密性も吸湿率により大きく左右されることになる。
【０００４】
そこで、密閉型アルカリ電池の気密性を向上させるために、例えば、特開昭６０−５６３６０号公報においては、封口ガスケットの含水率を０．５〜２．０％に規定することが提案され、特開平４−８７１４９号公報においては、封口ガスケットを大気平衡水分を吸湿して使用することが提案された。
【０００５】
【発明が解決しようとする課題】
しかしながら、吸湿性を有する封口ガスケットにあっては、乾燥した環境に置かれた場合に封口ガスケット内の水分が外部に放出されるという現象が出現し、これに伴い、封口ガスケットの成型時の金型との離型性を高めるために原材料のナイロン中に予め添加した離型剤および滑剤も封口ガスケットの表面に析出するという現象が出現する。この封口ガスケットの表面に析出した離型剤や滑剤は、封口ガスケットの構成材となるナイロンよりもシール剤との濡れ性が低いため、離型剤や滑剤が表面に析出した封口ガスケットにシール剤を塗布しようとすると、シール剤は離型剤や滑剤によりはじかれて塗布し難いという問題を生じる。
【０００６】
このため、特開昭６０−５６３６０号公報あるいは特開平４−８７１４９号公報において提案された封口ガスケットにあっては、低湿度の周囲環境において、離型剤や滑剤が封口ガスケットの表面に析出し、封口ガスケットにシール剤を塗布しようとした場合に、シール剤が離型剤や滑剤によりはじかれて、シール剤の塗布むらが生じて、封口ガスケットの気密性が低下するという問題を生じる。
【０００７】
【課題を解決するための手段およびその作用・効果】
本発明は少なくとも正・負極板からなる発電要素を収納した有底筒状の金属製外装缶の開口部にナイロンを主成分とする封口ガスケットと封口蓋とを載置し、外装缶の開口部端縁を封口ガスケットを介して封口蓋の方向にカシメて密封する密閉型アルカリ蓄電池の製造方法であって、上記課題を解決するために、封口ガスケットの表面に離型剤や滑剤を析出させ、この析出した離型剤や滑剤を除去した後にシール剤を塗布するようにして、シール剤の塗布むらを防止し、気密性に優れた封口ガスケットとすることにある。
【０００８】
このため、本発明の密閉型アルカリ蓄電池の製造方法は、ナイロンを主成分とする封口ガスケットを高温高湿雰囲気中で強制的に加湿して所定の吸湿率になるように調湿する加湿工程と、この加湿工程により調湿されて封口ガスケットの表面に析出した物質を洗浄する水洗工程と、この水洗工程により表面に析出した物質を洗浄した封口ガスケットを乾燥した後、封口ガスケットの表面にシール剤を塗布する塗布工程とを備えたことを特徴とする。
【０００９】
このように、加湿工程においてナイロンを主成分とする封口ガスケットを高温高湿雰囲気中で強制的に加湿して所定の吸湿率になるように調湿すると、この封口ガスケットの成型時の金型との離型性を高めるために原材料のナイロン中に予め添加した離型剤や滑剤が析出する。離型剤や滑剤が析出した封口ガスケットを水洗工程により洗浄すると、離型剤や滑剤が洗浄されて除去される。このため、この封口ガスケットの乾燥後に、塗布工程によりシール剤を塗布すると、シール剤と封口ガスケットとの濡れ性がよいため、シール剤の塗布むらを生じることが無くなり、気密性に優れた封口ガスケットとすることが可能となる。
【００１０】
【発明の実施の形態】
以下に、本発明の一実施形態を図に基づいて説明する。なお、図１は本発明をニッケル−カドミウム蓄電池に適用した本実施形態の密閉型アルカリ蓄電池の要部断面を示す図である。
本実施形態のニッケル−カドミウム蓄電池は、外装缶１０と、この外装缶１０内に配設された発電要素（電極体）２０と、外装缶１０の開口部を密閉する封口蓋３０と外装缶１０と封口蓋３０との間に介在されて外装缶１０の開口部を気密に密閉するための封口ガスケット４０とから構成される。
【００１１】
ここにおいて、外装缶１０は鉄にニッケルメッキを施し、内径が２０ｍｍになるように有底円筒状に形成されている。また、発電要素２０は、パンチングメタルの表面にニッケル焼結多孔体を形成した後、化学含浸法により水酸化ニッケルを主体とする正極活物質を焼結多孔体内に充填して製造した焼結式ニッケル正極と、同様に化学含浸法により水酸化カドミウムを主体とする負極活物質をニッケル焼結多孔体内に充填して製造した焼結式カドミウム負極とを備え、これらのニッケル正極とカドミウム負極は、これらの間にセパレータを介在させて巻回されている。
【００１２】
封口蓋３０は、底面に円形の下方突出部を形成してなる蓋体３１と、正極キャップ３３とこれら蓋体３１および正極キャップ３３間に介在されるスプリングと弁板からなる弁体３５とから構成されており、蓋体３１の中央にはガス抜き孔３２が形成されている。また、正極キャップ３３の底部には、排気孔３４が形成されている。なお、封口蓋３０の外径は１９ｍｍになるように形成されている。
【００１３】
封口ガスケット４０は次のようにして形成されたものを使用する。即ち、ナイロン６・６よりなる熱可塑性樹脂を射出成形により、外径２０ｍｍ、内径１９ｍｍ、高さ５ｍｍになるように成形して封口ガスケット４０とする。この封口ガスケット４０を相対湿度（ＲＨ）９０％、温度６０℃の雰囲気の高温高湿槽内に４時間の間存在させて強制加湿を行い、封口ガスケット４０の吸湿率（樹脂成分に対する水分の割合）を４％に調湿する。これにより、封口ガスケット４０の成型時の金型との離型性を高めるために原材料のナイロン中に予め添加した離型剤および滑剤が析出する。
【００１４】
ついで、この封口ガスケット４０を高温高湿槽内から常温雰囲気中に取り出し、封口ガスケット４０の表面に析出した離型剤および滑剤等を工業用水を用いて洗浄する。この後、封口ガスケット４０を遠心乾燥機内に投入し、遠心乾燥機を回転駆動することにより、洗浄により封口ガスケット４０の表面に付着した水分を除去する。このような前処理を施した封口ガスケット４０の表面に、アスファルトセメントをキシレンからなる有機溶剤に溶解させたシール剤を塗布し、シール剤が乾燥することにより、吸湿率が４％に調湿された封口ガスケット４０が形成される。
【００１５】
ここで、上述のように、強制加湿を行って吸湿率を４％に調湿した後、水洗してその表面に析出した離型剤および滑剤等を除去し、乾燥した後、シール剤を塗布して形成した封口ガスケット４０を１００００個用意する。一方、強制加湿を行った後乾燥して吸湿率を４％に調湿した後、シール剤を塗布して形成した従来例の封口ガスケットを１００００個用意する。これらの封口ガスケットのシール剤の塗りむらの発生数を目視により観測し、その発生率を算出すると下記の表１に示すような結果となった。
【００１６】
【表１】

Figure 0003573930
【００１７】
上記表１より明らかなように、従来例の封口ガスケットにあっては、強制加湿を行ってその表面に離型剤および滑剤等が析出した状態でシール剤を塗布するため、シール剤の塗りむらが発生しやくすくなることが分かる。しかしながら、本発明の封口ガスケット４０のように、強制加湿を行って吸湿率を４％に調湿した後、水洗してその表面に析出した離型剤および滑剤等を除去し、乾燥した後、シール剤を塗布して形成すると、その表面に析出した離型剤および滑剤等が除去されるので、シール剤の塗りむらが生じることが防止できるようになることが分かる。
【００１８】
［吸湿率の検討］
ついで、封口ガスケット４０の吸湿率（樹脂成分に対する水分の割合）を変化させて、それぞれの吸湿率に対するシール剤の塗りむらの発生について検討する。なお、吸湿率を変化させるに際して、上述した高温高湿槽内での封口ガスケット４０の存在時間を以下のように変化させて封口ガスケット４０の吸湿率を変化させた。
【００１９】
１．封口ガスケットＡ
上述と同様にして射出成形した封口ガスケット４０を相対湿度（ＲＨ）９０％、温度６０℃の雰囲気の高温高湿槽内に０．５時間の間存在させて、封口ガスケット４０の吸湿率が２％になるように強制加湿を行う。この後、上述と同様にして封口ガスケット４０を遠心乾燥機内に投入し、遠心乾燥機を回転駆動することにより、洗浄により封口ガスケット４０の表面に付着した水分を除去した後、封口ガスケット４０の表面に、アスファルトセメントをキシレンからなる有機溶剤に溶解させたシール剤を塗布・乾燥させて、吸湿率が２％に調湿された封口ガスケットＡを得る。
【００２０】
２．封口ガスケットＢ
上述と同様にして射出成形した封口ガスケット４０を相対湿度（ＲＨ）９０％、温度６０℃の雰囲気の高温高湿槽内に１時間の間存在させて、封口ガスケット４０の吸湿率が２．５％になるように強制加湿を行う。この後、上述と同様にして封口ガスケット４０を遠心乾燥機内に投入し、遠心乾燥機を回転駆動することにより、洗浄により封口ガスケット４０の表面に付着した水分を除去した後、封口ガスケット４０の表面に、アスファルトセメントをキシレンからなる有機溶剤に溶解させたシール剤を塗布・乾燥させて、吸湿率が２．５％に調湿された封口ガスケットＢを得る。
【００２１】
３．封口ガスケットＣ
上述と同様にして射出成形した封口ガスケット４０を相対湿度（ＲＨ）９０％、温度６０℃の雰囲気の高温高湿槽内に２時間の間存在させて、封口ガスケット４０の吸湿率が３％になるように強制加湿を行う。この後、上述と同様にして封口ガスケット４０を遠心乾燥機内に投入し、遠心乾燥機を回転駆動することにより、洗浄により封口ガスケット４０の表面に付着した水分を除去した後、封口ガスケット４０の表面に、アスファルトセメントをキシレンからなる有機溶剤に溶解させたシール剤を塗布・乾燥させて、吸湿率が３％に調湿された封口ガスケットＣを得る。
【００２２】
４．封口ガスケットＤ
上述と同様にして射出成形した封口ガスケット４０を相対湿度（ＲＨ）９０％、温度６０℃の雰囲気の高温高湿槽内に４時間の間存在させて、封口ガスケット４０の吸湿率が４％になるように強制加湿を行う。この後、上述と同様にして封口ガスケット４０を遠心乾燥機内に投入し、遠心乾燥機を回転駆動することにより、洗浄により封口ガスケット４０の表面に付着した水分を除去した後、封口ガスケット４０の表面に、アスファルトセメントをキシレンからなる有機溶剤に溶解させたシール剤を塗布・乾燥させて、吸湿率が４％に調湿された封口ガスケットＤを得る。
【００２３】
このように吸湿率を調整した各封口ガスケットＡ，Ｂ，Ｃ，Ｄをそれぞれ１００００個づつ用意し、これらの各封口ガスケットＡ，Ｂ，Ｃ，Ｄのシール剤の塗りむらの発生数を目視により観測し、その発生率を算出すると下記の表２に示すような結果となった。
【００２４】
【表２】
Figure 0003573930
【００２５】
上記表２より明らかなように、吸湿率を２％とした封口ガスケットＡのシール剤の塗りむら発生率が高くなっている。これは、ナイロン６・６の大気中での平衡水分率は２．５％であって、吸湿率がこの平衡水分率以下であると、封口ガスケットに予め添加された離型剤や滑剤が封口ガスケットの表面に充分に析出しなかったためと考えられる。このことから、強制加湿において、封口ガスケットの吸湿率を２．５％以上とすることが好ましい。
【００２６】
上述したように、本発明においては、まず、ナイロン６・６よりなる封口ガスケット４０を所定の湿度に調整した高温高湿槽内に所定の時間だけ存在させて強制的に加湿して所定の吸湿率になるように調整すると、封口ガスケットに予め添加された離型剤や滑剤が封口ガスケット４０の表面に析出する。この離型剤や滑剤が表面に析出した封口ガスケット４０を水洗すると、離型剤や滑剤は除去される。これにより、封口ガスケット４０を乾燥した後、シール剤を塗布すると、シール剤と封口ガスケット４０との濡れ性がよいため、シール剤に塗布むらを生じることが無くなり、気密性に優れた封口ガスケットとすることが可能となる。そして、封口ガスケット４０の吸湿率を２．５％以上に規制すると、封口ガスケットに予め添加された離型剤や滑剤が封口ガスケット４０の表面に充分に析出するようになるため、シール剤と封口ガスケット４０との濡れ性が良くなって、耐漏液性に優れた封口ガスケット４０が得られるようになる。
【００２７】
なお、上記実施形態の封口ガスケットにおいては、高温高湿槽内を所定の相対湿度（ＲＨ）雰囲気にするとともに所定の時間の間だけ封口ガスケットを存在させて強制加湿を行う例について説明したが、封口ガスケットを水中あるいは温水中に浸すようにして強制加湿を行って、所定の吸湿率になるように調湿してもよい。また、上記実施形態のニッケル−カドミウム蓄電池は円筒型のニッケル−カドミウム蓄電池について説明したが、円筒型に限らず、角形のニッケル−カドミウム蓄電池であっても本発明を適用することが可能である。
【００２８】
さらに、上記実施形態のニッケル−カドミウム蓄電池は、正極及び負極の何れも焼結式電極を用いたが、ペースト式などの非焼結式電極を用いた電池であっても同様な結果が得られた。また、本発明はニッケル−カドミウム蓄電池に限ることなく、どのような密閉型のアルカリ電池であっても適用可能である。
【図面の簡単な説明】
【図１】本発明の一実施形態の密閉型アルカリ蓄電池の要部断面を示す図である。
【符号の説明】
１０…外装缶、１１…開口部端縁、２０…発電要素（電極体）、３０…封口蓋、３１…蓋体、３２…ガス抜き孔、３３…正極キャップ、３４…排気孔、３５…弁体、４０…絶縁ガスケット[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a sealed alkaline storage battery in which the opening edge of a bottomed cylindrical metal outer can is caulked and sealed in the direction of a sealing lid via a sealing gasket, and in particular, a modification of the sealing gasket. It's about quality.
[0002]
[Prior art]
A sealed alkaline storage battery such as a nickel-cadmium storage battery or a nickel-hydride storage battery includes a sealing gasket and a sealing lid at an opening of a bottomed cylindrical metal outer can containing at least a power generating element composed of positive and negative electrode plates. It is common to mount the battery pack on the outer can and to caulk the opening edge of the outer can in the direction of the sealing lid via a sealing gasket to seal the outer can. One of the important issues for this type of sealed alkaline storage battery is how to improve the leakage resistance.
[0003]
For this reason, it is important to select the material of the sealing gasket.Now, as the material of the sealing gasket, nylon having excellent properties in mechanical strength, heat resistance, cold resistance, pressure resistance, oil resistance, etc. is widely used. Have been. The sealing gasket is used by applying a sealing agent in which asphalt is dissolved in an organic solvent in order to prevent leakage of the electrolytic solution due to creeping. On the other hand, nylon has a hygroscopic property, so that its characteristics greatly change depending on the surrounding environment. For this reason, the airtightness of the sealing gasket also depends greatly on the moisture absorption.
[0004]
Then, in order to improve the airtightness of the sealed alkaline battery, for example, in Japanese Patent Application Laid-Open No. 60-56360, it has been proposed to regulate the moisture content of the sealing gasket to 0.5 to 2.0%. In Japanese Patent Application Laid-Open No. 4-87149, it has been proposed to use a sealing gasket by absorbing atmospheric equilibrium moisture.
[0005]
[Problems to be solved by the invention]
However, in the case of a sealing gasket having a hygroscopic property, a phenomenon in which moisture in the sealing gasket is released to the outside when placed in a dry environment has appeared, and accordingly, the metal during molding of the sealing gasket has been developed. A phenomenon in which a release agent and a lubricant previously added to the raw material nylon in order to enhance the releasability from the mold also precipitates on the surface of the sealing gasket appears. The release agent or lubricant deposited on the surface of the sealing gasket has a lower wettability with the sealing agent than nylon, which is a constituent material of the sealing gasket. When a sealant is applied, there is a problem that the sealant is repelled by a release agent or a lubricant and is difficult to apply.
[0006]
For this reason, in the sealing gasket proposed in JP-A-60-56360 or JP-A-4-87149, in a low humidity ambient environment, a release agent or a lubricant is deposited on the surface of the sealing gasket. When a sealant is applied to a sealing gasket, the sealing agent is repelled by a release agent or a lubricant, resulting in uneven application of the sealing agent and a problem of lowering the airtightness of the sealing gasket.
[0007]
[Means for Solving the Problems and Their Functions and Effects]
The present invention places a sealing gasket and a sealing lid mainly composed of nylon on an opening of a bottomed cylindrical metal outer can containing at least a power generating element composed of a positive / negative electrode plate, and an opening of the outer can. A method for manufacturing a sealed alkaline storage battery in which an edge is sealed by caulking in the direction of a sealing lid via a sealing gasket, in order to solve the above-described problem, a mold release agent or a lubricant is deposited on a surface of the sealing gasket, It is an object of the present invention to provide a sealing gasket having excellent airtightness by applying a sealant after removing the deposited release agent and lubricant, thereby preventing uneven application of the sealant.
[0008]
For this reason, the manufacturing method of the sealed alkaline storage battery of the present invention comprises a humidifying step of forcibly humidifying a sealing gasket containing nylon as a main component in a high-temperature and high-humidity atmosphere so as to have a predetermined moisture absorption rate. A water-washing step of washing the substance that has been conditioned by the humidification step and deposited on the surface of the sealing gasket; and drying the sealing gasket that has washed the substance deposited on the surface by the water-washing step. And an application step of applying
[0009]
As described above, in the humidification step, the sealing gasket containing nylon as a main component is forcibly humidified in a high-temperature and high-humidity atmosphere to adjust the humidity to a predetermined moisture absorption rate. A releasing agent or lubricant previously added to the raw material nylon precipitates to enhance the releasability of the material. When the sealing gasket on which the release agent and the lubricant are deposited is washed by a water washing step, the release agent and the lubricant are washed and removed. For this reason, if the sealing agent is applied in an application step after the sealing gasket is dried, since the wettability between the sealing agent and the sealing gasket is good, uneven application of the sealing agent does not occur, and the sealing gasket having excellent airtightness is provided. It becomes possible.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a cross section of a main part of a sealed alkaline storage battery of the present embodiment in which the present invention is applied to a nickel-cadmium storage battery.
The nickel-cadmium storage battery according to the present embodiment includes an outer can 10, a power generation element (electrode body) 20 disposed in the outer can 10, a sealing lid 30 for sealing an opening of the outer can 10, and an outer can 10. And a sealing gasket 40 interposed between the gasket and the sealing lid 30 for hermetically sealing the opening of the outer can 10.
[0011]
Here, the outer can 10 is formed by applying nickel plating to iron and forming a bottomed cylinder so as to have an inner diameter of 20 mm. The power generating element 20 is formed by forming a sintered nickel body on the surface of a punching metal and then filling the sintered porous body with a positive electrode active material mainly composed of nickel hydroxide by a chemical impregnation method. Nickel positive electrode, similarly equipped with a sintered cadmium negative electrode manufactured by filling a negative electrode active material mainly composed of cadmium hydroxide into a nickel sintered porous body by a chemical impregnation method, these nickel positive electrode and cadmium negative electrode, It is wound with a separator between them.
[0012]
The sealing lid 30 is composed of a lid 31 having a circular downward protruding portion formed on the bottom surface, a positive electrode cap 33, and a valve 35 formed of a spring and a valve plate interposed between the lid 31 and the positive electrode cap 33. A gas vent hole 32 is formed in the center of the lid 31. An exhaust hole 34 is formed at the bottom of the positive electrode cap 33. The outer diameter of the sealing lid 30 is formed to be 19 mm.
[0013]
The sealing gasket 40 used is formed as follows. That is, a thermoplastic resin made of nylon 6.6 is formed by injection molding so as to have an outer diameter of 20 mm, an inner diameter of 19 mm, and a height of 5 mm, thereby obtaining a sealing gasket 40. The sealing gasket 40 was placed in a high-temperature and high-humidity tank at an atmosphere of 90% relative humidity (RH) and a temperature of 60 ° C. for 4 hours to perform forced humidification, and the moisture absorption rate of the sealing gasket 40 (moisture ratio to resin component) ) To 4%. As a result, a releasing agent and a lubricant previously added to the raw material nylon in order to enhance the releasability from the mold at the time of molding the sealing gasket 40 are deposited.
[0014]
Next, the sealing gasket 40 is taken out of the high-temperature and high-humidity tank into a room temperature atmosphere, and the release agent and the lubricant deposited on the surface of the sealing gasket 40 are washed with industrial water. Thereafter, the sealing gasket 40 is put into a centrifugal dryer, and the centrifugal dryer is driven to rotate, thereby removing water adhering to the surface of the sealing gasket 40 by washing. A sealing agent in which asphalt cement is dissolved in an organic solvent made of xylene is applied to the surface of the sealing gasket 40 that has been subjected to such pretreatment, and the moisture absorption is adjusted to 4% by drying the sealing agent. The sealed gasket 40 is formed.
[0015]
Here, as described above, after the forced humidification is performed to adjust the moisture absorption to 4%, the release agent and the lubricant etc. deposited on the surface are removed by washing with water, dried, and then applied with a sealant. 10000 sealing gaskets 40 formed as described above are prepared. On the other hand, after performing forced humidification and drying to adjust the moisture absorption to 4%, 10,000 sealing gaskets of a conventional example formed by applying a sealant are prepared. The number of occurrences of uneven coating of the sealing agent in these sealing gaskets was visually observed, and the occurrence rate was calculated. The results shown in Table 1 below were obtained.
[0016]
[Table 1]
Figure 0003573930
[0017]
As is clear from Table 1 above, in the conventional sealing gasket, since the sealing agent is applied in a state where the release agent and the lubricant etc. are deposited on the surface by forcible humidification, the coating unevenness of the sealing agent is applied. It can be seen that blemishes easily occur. However, as in the sealing gasket 40 of the present invention, after the forced humidification is performed to adjust the moisture absorption to 4%, the resultant is washed with water to remove the release agent and the lubricant deposited on the surface thereof, and then dried. It can be seen that when the sealant is formed by applying, the release agent, the lubricant, and the like deposited on the surface of the sealant are removed, so that it is possible to prevent the occurrence of uneven coating of the sealant.
[0018]
[Examination of moisture absorption rate]
Next, the moisture absorption rate (the ratio of moisture to the resin component) of the sealing gasket 40 is changed to examine the occurrence of uneven coating of the sealant for each moisture absorption rate. When the moisture absorption rate was changed, the moisture absorption rate of the sealing gasket 40 was changed by changing the existence time of the sealing gasket 40 in the high-temperature and high-humidity tank as described below.
[0019]
1. Seal gasket A
The sealing gasket 40 injection-molded in the same manner as described above is allowed to exist in a high-temperature and high-humidity tank having an atmosphere of a relative humidity (RH) of 90% and a temperature of 60 ° C. for 0.5 hour so that the moisture absorption rate of the sealing gasket 40 is 2 hours. % Humidification. Thereafter, the sealing gasket 40 is put into the centrifugal dryer in the same manner as described above, and the centrifugal dryer is driven to rotate to remove water adhering to the surface of the sealing gasket 40 by washing. Then, a sealing agent in which asphalt cement is dissolved in an organic solvent composed of xylene is applied and dried to obtain a sealing gasket A whose humidity absorption is adjusted to 2%.
[0020]
2. Seal gasket B
The sealing gasket 40 injection-molded in the same manner as described above is allowed to exist for 1 hour in a high-temperature and high-humidity tank in an atmosphere at a relative humidity (RH) of 90% and a temperature of 60 ° C., so that the moisture absorption rate of the sealing gasket 40 is 2.5. % Humidification. Thereafter, the sealing gasket 40 is put into the centrifugal dryer in the same manner as described above, and the centrifugal dryer is driven to rotate to remove water adhering to the surface of the sealing gasket 40 by washing. Then, a sealing agent in which asphalt cement is dissolved in an organic solvent made of xylene is applied and dried to obtain a sealing gasket B whose moisture absorption is adjusted to 2.5%.
[0021]
3. Seal gasket C
The sealing gasket 40 injection-molded in the same manner as described above is allowed to exist in a high-temperature and high-humidity tank at an atmosphere of a relative humidity (RH) of 90% and a temperature of 60 ° C. for 2 hours so that the moisture absorption rate of the sealing gasket 40 becomes 3%. Perform forced humidification so that Thereafter, the sealing gasket 40 is put into the centrifugal dryer in the same manner as described above, and the centrifugal dryer is driven to rotate to remove water adhering to the surface of the sealing gasket 40 by washing. Then, a sealing agent in which asphalt cement is dissolved in an organic solvent made of xylene is applied and dried to obtain a sealing gasket C whose moisture absorption is adjusted to 3%.
[0022]
4. Seal gasket D
The sealing gasket 40 injection-molded in the same manner as described above is allowed to exist in a high-temperature and high-humidity tank having an atmosphere of a relative humidity (RH) of 90% and a temperature of 60 ° C. for 4 hours so that the moisture absorption rate of the sealing gasket 40 becomes 4%. Perform forced humidification so that Thereafter, the sealing gasket 40 is put into the centrifugal dryer in the same manner as described above, and the centrifugal dryer is driven to rotate to remove water adhering to the surface of the sealing gasket 40 by washing. Then, a sealing agent in which asphalt cement is dissolved in an organic solvent made of xylene is applied and dried to obtain a sealing gasket D whose humidity absorption is adjusted to 4%.
[0023]
Each of the sealing gaskets A, B, C, and D whose moisture absorption was adjusted in this manner was prepared in a number of 10,000 each, and the number of unevenness of the sealant applied to each of the sealing gaskets A, B, C, and D was visually observed. Observation and calculation of the incidence yielded the results shown in Table 2 below.
[0024]
[Table 2]
Figure 0003573930
[0025]
As is clear from Table 2 above, the rate of occurrence of uneven coating of the sealing agent of the sealing gasket A with a moisture absorption rate of 2% is high. This is because the equilibrium moisture content of nylon 6.6 in the atmosphere is 2.5%, and if the moisture absorption rate is equal to or less than this equilibrium moisture content, the release agent or the lubricant added to the sealing gasket before the sealing is used. This is probably because the gasket did not sufficiently precipitate on the surface. For this reason, in the forced humidification, the moisture absorption rate of the sealing gasket is preferably set to 2.5% or more.
[0026]
As described above, in the present invention, first, the sealing gasket 40 made of nylon 6.6 is placed in a high-temperature and high-humidity tank adjusted to a predetermined humidity for a predetermined period of time to forcibly humidify it to obtain a predetermined moisture absorption. When the ratio is adjusted to the ratio, the release agent and the lubricant previously added to the sealing gasket are deposited on the surface of the sealing gasket 40. When the sealing gasket 40 on which the release agent and the lubricant are deposited is washed with water, the release agent and the lubricant are removed. Thereby, when the sealing agent is applied after the sealing gasket 40 is dried, since the sealing agent and the sealing gasket 40 have good wettability, uneven application of the sealing agent does not occur, and a sealing gasket having excellent airtightness can be obtained. It is possible to do. When the moisture absorption rate of the sealing gasket 40 is regulated to 2.5% or more, the release agent and the lubricant previously added to the sealing gasket will sufficiently precipitate on the surface of the sealing gasket 40. The wettability with the gasket 40 is improved, and the sealing gasket 40 having excellent liquid leakage resistance can be obtained.
[0027]
In the sealing gasket of the above-described embodiment, an example has been described in which the inside of the high-temperature and high-humidity chamber is set to a predetermined relative humidity (RH) atmosphere, and the sealing gasket is present only for a predetermined time to perform forced humidification. Forced humidification may be performed by immersing the sealing gasket in water or warm water to adjust the humidity to a predetermined moisture absorption rate. Although the nickel-cadmium storage battery of the above embodiment has been described as a cylindrical nickel-cadmium storage battery, the present invention is not limited to a cylindrical nickel-cadmium storage battery, and the present invention can be applied to a square nickel-cadmium storage battery.
[0028]
Furthermore, although the nickel-cadmium storage battery of the above embodiment uses a sintered electrode for both the positive electrode and the negative electrode, similar results can be obtained in a battery using a non-sintered electrode such as a paste type. Was. Further, the present invention is not limited to a nickel-cadmium storage battery, but is applicable to any sealed alkaline battery.
[Brief description of the drawings]
FIG. 1 is a diagram showing a cross section of a main part of a sealed alkaline storage battery according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Exterior can, 11 ... Opening edge, 20 ... Power generation element (electrode body), 30 ... Sealing lid, 31 ... Lid, 32 ... Gas vent hole, 33 ... Positive electrode cap, 34 ... Exhaust hole, 35 ... Valve Body, 40 ... insulating gasket

Claims (4)

少なくとも正・負極板からなる発電要素を収納した有底筒状の金属製外装缶の開口部にナイロンを主成分とする封口ガスケットと封口蓋とを載置し、前記外装缶の開口部端縁を前記封口ガスケットを介して前記封口蓋の方向にカシメて密封する密閉型アルカリ蓄電池の製造方法であって、
前記ナイロンを主成分とする封口ガスケットを高温高湿雰囲気中で強制的に加湿して所定の吸湿率になるように調湿する加湿工程と、
前記加湿工程により調湿されて、前記封口ガスケットの表面に析出した物質を洗浄する水洗工程と、
前記水洗工程により表面に析出した物質を洗浄した前記封口ガスケットを乾燥した後、同封口ガスケットの表面にシール剤を塗布する塗布工程とを備えたことを特徴とする密閉型アルカリ蓄電池の製造方法。A sealing gasket containing nylon as a main component and a sealing lid are placed in the opening of a bottomed cylindrical metal outer can containing at least a power generating element composed of a positive and negative electrode plate, and the opening edge of the outer can A method for manufacturing a sealed alkaline storage battery, which is caulked in the direction of the sealing lid via the sealing gasket and sealed.
A humidifying step of forcibly humidifying the sealing gasket containing the nylon as a main component in a high-temperature and high-humidity atmosphere and adjusting the humidity to a predetermined moisture absorption rate,
A water washing step of washing a substance that is humidified by the humidification step and deposited on the surface of the sealing gasket;
A method of drying the sealing gasket after cleaning the substance deposited on the surface in the water washing step, and then applying a sealing agent to the surface of the sealing gasket. 前記所定の吸湿率は２．５％以上であることを特徴とする請求項１に記載の密閉型アルカリ蓄電池の製造方法。The method for manufacturing a sealed alkaline storage battery according to claim 1, wherein the predetermined moisture absorption rate is 2.5% or more. 前記シール剤はアスファルトを有機溶剤に溶解させて形成したシール剤であることを特徴とする請求項１または請求項２に記載の密閉型アルカリ蓄電池の製造方法。The method according to claim 1, wherein the sealing agent is a sealing agent formed by dissolving asphalt in an organic solvent. 前記加湿工程おいて前記封口ガスケットの表面に析出した物質は同封口ガスケットの成型時の離型性を高めるために原材料のナイロン中に添加した離型剤および滑剤であることを特徴とする請求項１から請求項３のいずれかに記載の密閉型アルカリ蓄電池の製造方法。The substance deposited on the surface of the sealing gasket in the humidification step is a release agent and a lubricant added to the raw material nylon in order to enhance the releasability at the time of molding the sealing gasket. The method for producing a sealed alkaline storage battery according to claim 1.
JP29873497A 1997-10-30 1997-10-30 Manufacturing method of sealed alkaline storage battery Expired - Fee Related JP3573930B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007123119A1 (en) * 2006-04-19 2007-11-01 Panasonic Corporation Alkaline cell

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007123119A1 (en) * 2006-04-19 2007-11-01 Panasonic Corporation Alkaline cell

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