JP2000021437A - Manufacture of sealed battery - Google Patents

Manufacture of sealed battery

Info

Publication number
JP2000021437A
JP2000021437A JP10184705A JP18470598A JP2000021437A JP 2000021437 A JP2000021437 A JP 2000021437A JP 10184705 A JP10184705 A JP 10184705A JP 18470598 A JP18470598 A JP 18470598A JP 2000021437 A JP2000021437 A JP 2000021437A
Authority
JP
Japan
Prior art keywords
electrolyte
welding
liquid
laser beam
port
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10184705A
Other languages
Japanese (ja)
Inventor
Yoshihiko Hatano
吉彦 端野
Toshiro Yanagawa
俊郎 柳川
Hiroshi Hosokawa
弘 細川
Hiroshi Minamino
弘史 南野
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP10184705A priority Critical patent/JP2000021437A/en
Publication of JP2000021437A publication Critical patent/JP2000021437A/en
Pending legal-status Critical Current

Links

Classifications

    • 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

Landscapes

  • Sealing Battery Cases Or Jackets (AREA)
  • Filling, Topping-Up Batteries (AREA)
  • Primary Cells (AREA)
  • Secondary Cells (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a sealed battery manufacturing method capable of preventing the generation of welding failure, while eliminating the electrolyte adhered before sealing an electrolyte pouring port or a coated oxide film. SOLUTION: In this manufacturing method, a sealed body 10 is put in an opening part of an outer can, and the periphery thereof is welded to the outer can for seal, and inside of the electrolyte pouring port 11 is filled with the electrolyte. Thereafter, the inside of a stepped part 11a and the periphery 11b of the electrolyte pouring port 11 extended outward from the stepped part 11a is irradiated with a larger beam A so as to evaporate the electrolyte adhered by spattering at the time of pouring the electrolyte, and a irradiation layer 12 for reforming the coating material such as an oxide film coated by the electrolytic atmosphere to the material, which does not adversely affect welding, so as to eliminate the adhesion of the electrolyte. An electrolyte port plug 13 is inserted into the electrolyte pouring port 11, and a flange part 13a of the electrolyte port plug 13 is fitted in the stepped part 11a, and the laser beam B is irradiated for scanning along a boundary between the flange part 13a and the electrolyte pouring port 11, and the electrolyte port plug 13 and the pouring port 11 are sealed by welding so as to form a welding part 14.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は注液口を溶接で封止
する工程を備えた密閉型電池の製造方法に係り、特に、
有底角筒状の金属製外装缶を用いた角形電池の製造方法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a sealed battery provided with a step of sealing a liquid inlet by welding.
The present invention relates to a method for manufacturing a prismatic battery using a bottomed rectangular cylindrical metal outer can.

【０００２】[0002]

【従来の技術】一般的に、リチウム一次電池、リチウム
二次電池、ニッケル−カドミウム蓄電池、ニッケル−水
素蓄電池等の角形密閉型電池は、有底角筒状に成形した
金属製外装缶内に、セパレータを介して正極と負極を積
層した発電要素を収納した後、外装缶の開口に封口板を
溶接し、封口板に設けられた注液口より電解液を注入し
た後、注液口を封止することにより作製される。2. Description of the Related Art Generally, a sealed rectangular battery such as a lithium primary battery, a lithium secondary battery, a nickel-cadmium storage battery, and a nickel-hydrogen storage battery is provided in a metal outer can that is formed into a bottomed rectangular tube. After storing the power generating element in which the positive electrode and the negative electrode are laminated via the separator, the sealing plate is welded to the opening of the outer can, and the electrolyte is injected from the injection hole provided in the sealing plate, and then the injection hole is sealed. It is produced by stopping.

【０００３】ところで、上述した注液口を封止する手段
としては、一般的には、溶接プロセスが利用されてお
り、例えば、注液口に金属製の液口栓を挿入し、この液
口栓と注液口の周囲壁とを溶接する方法や、あるいは注
液口の上部にゴム製の液口栓を配置するとともに、この
液口栓を覆うように封止板を配置し、封止板と注液口の
周囲壁とを溶接して、ゴム製の液口栓を注液口に密閉固
定する方法がある。[0003] Incidentally, as a means for sealing the above-mentioned liquid inlet, a welding process is generally used. For example, a metal liquid stopper is inserted into the liquid inlet, and this liquid outlet is inserted. A method of welding the stopper and the surrounding wall of the liquid inlet, or a rubber liquid stopper is arranged above the liquid inlet, and a sealing plate is arranged so as to cover the liquid stopper and sealed. There is a method in which a plate and a peripheral wall of a liquid injection port are welded, and a rubber liquid port plug is hermetically fixed to the liquid injection port.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、電解液
の注入工程において、図５（ａ）に示すように、封口板
２０に設けられた注液口２１の段部２１ａおよびその周
囲には電解液２２が付着したり、あるいは電解液の飛散
や電解液雰囲気による酸化被膜２３等により被覆され
る。このため、図５（ｂ）に示すように、この注液口２
１に金属製の液口栓２４を挿入すると、付着した電解液
２２および被覆された酸化被膜２３が液口栓２４内に閉
じ込められるという事態を生じる。However, in the step of injecting the electrolyte, as shown in FIG. 5 (a), the step 21a of the injection port 21 provided on the sealing plate 20 and the periphery thereof are provided with the electrolyte. 22 is adhered, or is covered with an oxide film 23 or the like due to scattering of the electrolytic solution or an electrolytic solution atmosphere. For this reason, as shown in FIG.
When the liquid stopper 24 made of metal is inserted into the liquid container 1, the attached electrolyte 22 and the coated oxide film 23 are confined in the stopper 24.

【０００５】付着した電解液２２および被覆された酸化
被膜２３が液口栓２４内に閉じ込められたまま、図５
（ｃ）に示すように、レーザビーム２５を照射して溶接
を行うと、図５（ｄ）に示すように、溶接溶融部２６に
多くの気孔やピンホール２７が形成され、溶接不良の原
因になるという問題を生じた。また、溶接溶融部２６に
溶接不良が生じると、電池使用時に電解液が封口板の上
に溢れ出て、リークの発生の原因になるという問題も生
じる。[0005] While the adhered electrolytic solution 22 and the coated oxide film 23 are confined in the liquid stopper 24, FIG.
As shown in FIG. 5 (c), when welding is performed by irradiating the laser beam 25, as shown in FIG. 5 (d), many pores and pinholes 27 are formed in the weld fusion part 26, and the cause of poor welding is caused. Problem. In addition, when a welding defect occurs in the weld fusion portion 26, the electrolyte overflows onto the sealing plate when the battery is used, which causes a problem of causing a leak.

【０００６】[0006]

【課題を解決するための手段およびその作用・効果】そ
こで、本発明は上記問題点に鑑みてなされたものであ
り、注液口を封止する前に付着した電解液あるいは被覆
された酸化被膜を除去して溶接不良が生じない密閉型電
池の製造方法を提供することにある。SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above problems, and has been made in consideration of an electrolyte or a coated oxide film adhered before sealing a liquid inlet. It is an object of the present invention to provide a method of manufacturing a sealed battery in which no defective welding occurs due to removal of gas.

【０００７】このため、本発明の密閉型電池の製造方法
にあっては、溶接工程の前処理として注液口の溶接部お
よびその近傍に付着する付着物あるいは注液口の溶接部
およびその近傍に被覆された被覆物を除去する除去工程
を備えるようにしている。溶接工程の前に注液口の溶接
部およびその近傍に付着する付着物あるいは注液口の溶
接部近傍に被覆された被覆物を除去する除去工程を備え
るようにすると、付着した付着物あるいは被覆された被
覆物が液口栓内に閉じ込められることがないため、溶接
不良を生じることはない。For this reason, in the method of manufacturing a sealed battery according to the present invention, as a pretreatment for the welding step, a deposit adhering to the welded portion of the injection port and its vicinity or the welded portion of the injection port and its vicinity is provided. A removing step of removing the coating material coated on the substrate. Before the welding step, a removing step for removing the deposit adhering to the welded portion of the injection port and the vicinity thereof or the coating applied near the welded portion of the injection port is provided. Since the applied coating is not trapped in the liquid stopper, poor welding does not occur.

【０００８】そして、除去工程においてエネルギービー
ム、例えばレーザビームを照射するようにすると、注液
口の溶接部およびその近傍に付着した付着物は照射され
たレーザエネルギーにより蒸発して飛散するとともに、
電解液雰囲気によって注液口の溶接部およびその近傍に
できた表面酸化皮膜（被覆物）はレーザエネルギーによ
り除去されるため、溶接溶融部に気孔やピンホールが形
成されることが防止できるようになる。When an energy beam, for example, a laser beam is irradiated in the removing step, the deposits attached to the welded portion of the injection port and its vicinity are evaporated and scattered by the irradiated laser energy, and
Since the surface oxide film (coating) formed on the welded portion of the injection port and its vicinity by the electrolyte atmosphere is removed by laser energy, the formation of pores and pinholes in the weld fusion zone can be prevented. Become.

【０００９】また、金属製外装缶の開口部に金属製封口
体を載置してこの封口体と外装缶との境界部をシーム溶
接して封缶する場合は、一般的には有底角筒状の外装缶
を用いるので、金属製外装缶として有底角筒状の外装缶
を用いる場合に本発明を適用すると特に効果的である。When a metal sealing body is placed on the opening of a metal outer can and the boundary between the sealing body and the outer can is seam-welded, the can is generally closed. Since a cylindrical outer can is used, it is particularly effective to apply the present invention to a case where a bottomed rectangular cylindrical outer can is used as a metal outer can.

【００１０】[0010]

【発明の実施の形態】以下に、本発明の密閉型電池の製
造方法をリチウムイオン電池に適用した場合の一実施形
態を図に基づいて説明する。なお、図１は外装缶に封口
体を取り付けた状態の外観を示す図である。図２は封口
体に設けられた注液口に液口栓を溶接する工程を示す断
面図である。図３は封口体に設けられた注液口にゴム栓
と液口蓋を載置した後に溶接する変形例の工程を示す断
面図である。図４は液口栓および注液口の変形例を示す
断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment in which a method of manufacturing a sealed battery according to the present invention is applied to a lithium ion battery will be described with reference to the drawings. FIG. 1 is a diagram showing the appearance of a state in which a sealing body is attached to an outer can. FIG. 2 is a cross-sectional view showing a step of welding a liquid port plug to a liquid injection port provided in a sealing body. FIG. 3 is a cross-sectional view showing a process of a modification in which a rubber stopper and a liquid port cover are placed on a liquid inlet provided in a sealing body and then welded. FIG. 4 is a sectional view showing a modified example of the liquid port stopper and the liquid injection port.

【００１１】ａ．電極体の作製 天然黒鉛よりなる負極活物質とポリビニリデンフルオラ
イト（ＰＶＤＦ）よりなる結着剤等とを、Ｎ−メチルピ
ロリドンからなる有機溶剤等に溶解したものを混合し
て、スラリーあるいはペーストとする。これらのスラリ
ーあるいはペーストを、スラリーの場合はダイコータ
ー、ドクターブレード等を用いて、ペーストの場合はロ
ーラコーティング法等により金属芯体（例えば、銅箔）
の両面の全面にわたって均一に塗布して、活物質層を塗
布した負極板を形成する。この後、活物質層を塗布した
負極板を乾燥機中を通過させて、スラリーあるいはペー
スト作製に必要であった有機溶剤を除去して乾燥させ
る。この乾燥負極板をロールプレス機により圧延して負
極板とする。A. Preparation of electrode body A mixture of a negative electrode active material made of natural graphite and a binder made of polyvinylidene fluorite (PVDF) dissolved in an organic solvent made of N-methylpyrrolidone is mixed with a slurry or paste. I do. These slurries or pastes are prepared by using a die coater, a doctor blade or the like in the case of a slurry, or a metal core (for example, copper foil) by a roller coating method or the like in the case of a paste.
To form a negative electrode plate coated with an active material layer. Thereafter, the negative electrode plate coated with the active material layer is passed through a drier to remove an organic solvent necessary for preparing a slurry or a paste, followed by drying. The dried negative electrode plate is rolled by a roll press to form a negative electrode plate.

【００１２】一方、ＬｉＣｏＯ2からなる正極活物質
と、アセチレンブラック、グラファイト等の炭素系導電
剤と、ポリビニリデンフルオライト（ＰＶＤＦ）よりな
る結着剤等とを、Ｎ−メチルピロリドンからなる有機溶
剤等に溶解したものを混合して、スラリーあるいはペー
ストとする。なお、スラリーあるいはペースト中にポリ
エチレンオキシド、ポリアクリロニトリル、セルロース
等の添加剤を添加してもよい。これらのスラリーあるい
はペーストを、スラリーの場合はダイコーター、ドクタ
ーブレード等を用いて、ペーストの場合はローラコーテ
ィング法等により金属芯体（例えば、アルミニウム箔）
の両面に均一に塗布して、活物質層を塗布した正極板を
形成する。この後、活物質層を塗布した正極板を乾燥機
中を通過させて、スラリーあるいはペースト作製に必要
であった有機溶剤を除去して乾燥させる。乾燥後、この
乾燥正極板をロールプレス機により圧延して正極板とす
る。On the other hand, a positive electrode active material composed of LiCoO 2 , a carbon-based conductive agent such as acetylene black and graphite, a binder composed of polyvinylidene fluorite (PVDF) and the like are combined with an organic solvent composed of N-methylpyrrolidone. Are mixed to form a slurry or paste. Note that additives such as polyethylene oxide, polyacrylonitrile, and cellulose may be added to the slurry or paste. These slurries or pastes are prepared by using a die coater, a doctor blade or the like in the case of a slurry, or a metal core (for example, aluminum foil) by a roller coating method or the like in the case of a paste.
To form a positive electrode plate coated with an active material layer. Thereafter, the positive electrode plate coated with the active material layer is passed through a drier to remove an organic solvent necessary for preparing a slurry or a paste, followed by drying. After drying, the dried positive electrode plate is rolled by a roll press to obtain a positive electrode plate.

【００１３】上述のようにして作製した負極板と正極板
とを、有機溶媒との反応性が低く、かつ安価なポリオレ
フィン系樹脂からなる微多孔膜、好適にはポリエチレン
製微多孔膜を間にして重ね合わせ、図示しない巻き取り
機により卷回する。この後、最外周をテープ止めして渦
巻状電極体とした後、プレス機で角形外装缶に挿入でき
るような形に成形して電極体とする。A negative electrode plate and a positive electrode plate produced as described above are sandwiched between a microporous film made of an inexpensive polyolefin-based resin having low reactivity with an organic solvent, preferably a polyethylene microporous film. And wound by a winder (not shown). Thereafter, the outermost periphery is taped to form a spiral electrode body, and then formed into a shape that can be inserted into a rectangular outer can with a press machine to obtain an electrode body.

【００１４】ｂ．リチウムイオン電池の作製 ついで、Ａｌ−Ｍｎ系合金板を深絞り加工により有底筒
状の角形外装缶（例えば、外形寸法が、高さ６５ｍｍ、
幅３４ｍｍ、厚み５．９ｍｍ、肉厚０．５ｍｍのもの）
１０Ａの開口部より、上述のようにして作製した電極体
を外装缶１０Ａ内に挿入する。なお、この外装缶１０Ａ
は正極端子を兼ねている。B. Production of Lithium-ion Battery Then, a bottomed cylindrical prismatic outer can (for example, the outer dimensions are 65 mm in height,
(34mm wide, 5.9mm thick, 0.5mm thick)
The electrode body manufactured as described above is inserted into the outer can 10A from the opening of 10A. In addition, this outer can 10A
Also serves as a positive electrode terminal.

【００１５】電極体を外装缶１０Ａ内に挿入した後、電
極体の上部に外装缶１０Ａ内に挿入した電極体が移動し
ないように保持するスペーサを載置する。この後、外装
缶１０Ａに溶接された正極集電リード板と正極導電タブ
とを溶接するとともに、後述する封口体１０の端子孔に
取り付けられた負極端子１０Ｂに固着された負極集電リ
ード板と負極導電タブとを溶接する。ついで、外装缶１
０Ａの開口部に、封口体１０を載置した後、封口体１０
と外装缶１０Ａとの境界部に沿ってレーザビームを照射
しながら走査することで、封口体１０と外装缶１０Ａと
をシーム溶接して外装缶１０Ａの開口部を封口する。After the electrode body is inserted into the outer can 10A, a spacer for holding the electrode body inserted into the outer can 10A so as not to move is placed above the electrode body. Thereafter, the positive electrode current collecting lead plate and the positive electrode conductive tab welded to the outer can 10A are welded, and the negative electrode current collecting lead plate fixed to the negative electrode terminal 10B attached to a terminal hole of the sealing body 10 described below. Weld with the negative electrode conductive tab. Then, outer can 1
After the sealing body 10 is placed in the opening of 0A, the sealing body 10
By scanning while irradiating a laser beam along the boundary between the outer can 10A and the outer can 10A, the sealing body 10 and the outer can 10A are seam-welded to seal the opening of the outer can 10A.

【００１６】ここで、封口体１０は、外装缶１０Ａの開
口を封口するために設けるものであって、Ａｌ−Ｍｎ系
合金板を外装缶１０Ａの開口部の形状に合うように打ち
抜かれており、その中央部に負極端子１０Ｂを配設し、
負極端子１０Ｂの側部に注液口１１を配設している。注
液口１１には段部１１ａが形成されており、この段部１
１ａ内に後述する液口栓１３のフランジ部１３ａが嵌合
するようになる。Here, the sealing body 10 is provided for sealing the opening of the outer can 10A, and is made by punching an Al-Mn alloy plate so as to match the shape of the opening of the outer can 10A. , A negative electrode terminal 10B is provided at the center thereof,
The injection port 11 is provided on the side of the negative electrode terminal 10B. A step 11 a is formed in the injection port 11.
A flange portion 13a of the liquid port plug 13, which will be described later, fits inside 1a.

【００１７】そして、外装缶１０Ａの開口部に封口体１
０を載置してその周囲を外装缶に溶接して封口した後、
注液口１１内にエチレンカーボネート（ＥＣ）３０重量
部とジエチルカーボネート（ＤＥＣ）７０重量部よりな
る混合溶媒に電解質塩として１ＭＬｉＰＦ6を添加した
電解液を注入する。The sealing body 1 is inserted into the opening of the outer can 10A.
After placing 0 and welding the periphery to the outer can and sealing it,
Into the liquid inlet 11 is injected an electrolyte obtained by adding 1 M LiPF 6 as an electrolyte salt to a mixed solvent consisting of 30 parts by weight of ethylene carbonate (EC) and 70 parts by weight of diethyl carbonate (DEC).

【００１８】なお、電解液としては、有機溶媒に溶質と
してリチウム塩を溶解したイオン伝導体であって、イオ
ン伝導率が高く、正・負の各電極に対して化学的、電気
化学的に安定で、使用可能温度範囲が広くかつ安全性が
高く、安価なものを使用する。例えば、有機溶媒として
は上記エチレンカーボネート（ＥＣ）とジエチルカーボ
ネート（ＤＥＣ）との混合溶媒以外に、プロピレンカー
ボネート（ＰＣ）、スルフォラン（ＳＬ）、テトラハイ
ドロフラン（ＴＨＦ）、γブチロラクトン（ＧＢＬ）、
ジメチルカーボネート（ＤＭＣ）、エチルメチルカーボ
ネート（ＥＭＣ）、１，２ジメトキシエタン（ＤＭＥ）
等あるいはこれらの混合溶媒が好適である。また、溶質
としては電子吸引性の強いリチウム塩を使用し、上記Ｌ
ｉＰＦ6以外に例えば、ＬｉＢＦ4、ＬｉＣｌＯ4、Ｌｉ
ＡｓＦ6、ＬｉＣＦ3ＳＯ3、Ｌｉ（ＣＦ3ＳＯ2）2Ｎ、Ｌ
ｉＣ4Ｆ9ＳＯ3等が好適である。The electrolyte is an ionic conductor obtained by dissolving a lithium salt as a solute in an organic solvent and has a high ionic conductivity and is chemically and electrochemically stable with respect to the positive and negative electrodes. Therefore, use an inexpensive one that has a wide usable temperature range, high safety, and low cost. For example, as the organic solvent, in addition to the above-mentioned mixed solvent of ethylene carbonate (EC) and diethyl carbonate (DEC), propylene carbonate (PC), sulfolane (SL), tetrahydrofuran (THF), γ-butyrolactone (GBL),
Dimethyl carbonate (DMC), ethyl methyl carbonate (EMC), 1,2 dimethoxyethane (DME)
Or a mixed solvent thereof is suitable. As the solute, a lithium salt having a strong electron-withdrawing property is used.
Other than iPF 6 , for example, LiBF 4 , LiClO 4 , Li
AsF 6 , LiCF 3 SO 3 , Li (CF 3 SO 2 ) 2 N, L
iC 4 F 9 SO 3 and the like are preferred.

【００１９】電解液の注液後、図示しないレーザビーム
照射装置よりレーザビームＡを注液口１１の段部１１ａ
内および段部１１ａより外方に延出する周囲１１ｂに照
射して、電解液の注入時に飛散して付着した電解液を蒸
発させて除去するとともに、電解液雰囲気によりできた
表面酸化被膜（被覆物）を照射層１２を形成して除去す
る。ここで、レーザビームＡの照射条件は、例えば、パ
ルス幅１００ｎｓ、平均出力１５Ｗ、パルス繰り返し数
１０，０００パルス／秒、レーザ照射径５０μｍのＹＡ
Ｇレーザではレーザ走査速度１００ｍｍ／ｓ以下で完全
に除去できる。After the electrolyte is injected, a laser beam A is applied by a laser beam irradiation device (not shown) to the step 11a of the injection port 11.
Irradiation is performed on the periphery 11b extending outward from the inside and the step 11a to evaporate and remove the electrolytic solution scattered and adhered at the time of injection of the electrolytic solution, and a surface oxide film (coating) formed by the electrolytic atmosphere. Is removed by forming the irradiation layer 12. Here, the irradiation condition of the laser beam A is, for example, YA having a pulse width of 100 ns, an average output of 15 W, a pulse repetition rate of 10,000 pulses / second, and a laser irradiation diameter of 50 μm.
The G laser can be completely removed at a laser scanning speed of 100 mm / s or less.

【００２０】また、パルス幅１ｍｓのＹＡＧレーザで
は、パワー密度２〜１５Ｗ／ｃｍ2でよい。また、レー
ザビームＡはＹＡＧレーザのみではなく、紫外光のエキ
シマレーザを用いれば、例えば、エネルギー密度１．１
Ｊ／ｃｍ2で１パルス照射すればよい。In a YAG laser having a pulse width of 1 ms, the power density may be 2 to 15 W / cm 2 . When the laser beam A is not only a YAG laser but also an excimer laser of ultraviolet light, for example, the energy density is 1.1.
One pulse irradiation may be performed at J / cm 2 .

【００２１】ついで、Ａｌ−Ｍｎ系合金製で断面形状が
Ｔ字状でフランジ部１３ａを備えた液口栓１３を注液口
１１に挿入して、フランジ部１３ａを段部１１ａに嵌合
させた後、液口栓１３と注液口１１との境界部に沿って
レーザビームＢを照射しながら走査することで、液口栓
１３と注液口１１とを封止溶接して溶接部１４を形成す
る。Next, a liquid port plug 13 made of an Al-Mn alloy and having a T-shaped cross section and provided with a flange portion 13a is inserted into the liquid inlet 11, and the flange portion 13a is fitted into the step portion 11a. Then, by scanning while irradiating the laser beam B along the boundary between the liquid port plug 13 and the liquid injection port 11, the liquid port plug 13 and the liquid injection port 11 are sealed and welded to form a welding portion 14. To form

【００２２】上述のように、液口栓１３と注液口１１と
の封止溶接工程の前工程として、レーザビームＡを注液
口１１の周囲に照射すると、レーザビームＡが照射され
た照射領域１２には溶接不良の原因となる残留物等がな
くなるため、この照射領域１２内にて封止溶接を行う
と、溶接不良率は約０．１％以下に減少した。因みに、
従来例のように、レーザビームＡを照射することなく液
口栓１３と注液口１１とを溶接した場合の溶接不良率は
約２０〜３０％であったことからすると、レーザビーム
Ａを注液口１１の周囲に照射することは極めて効果的で
あることが分かる。As described above, when the laser beam A is irradiated around the injection port 11 as a pre-process of the sealing welding process between the liquid port plug 13 and the injection port 11, the irradiation with the laser beam A is performed. Since there is no residue or the like that causes poor welding in the region 12, when the sealing welding is performed in the irradiation region 12, the defective welding rate is reduced to about 0.1% or less. By the way,
Since the welding failure rate when the liquid port plug 13 and the liquid inlet 11 were welded without irradiating the laser beam A as in the conventional example was about 20 to 30%, the laser beam A was injected. It can be seen that irradiating around the liquid port 11 is extremely effective.

【００２３】なお、レーザビームＡを注液口１１の段部
１１ａ内のみに照射しても、段部１１ａに隣接する領域
に電解液が付着している場合、電池搬送時の振動等によ
り電解液が再付着する可能性があるため、注液口１１の
段部１１ａの周囲に延出する部分１１ｂまでレーザビー
ムＡを照射するようにしている。これにより、注液口１
１の段部１１ａの周辺に電解液が付着していても、封止
溶接部１４までの距離が長くなるため、電解液が再付着
する可能性が極めて低くなる。Even if the laser beam A is applied only to the inside of the step 11a of the liquid injection port 11, if the electrolytic solution adheres to the area adjacent to the step 11a, the electrolytic solution may be vibrated due to vibration at the time of transporting the battery. Since there is a possibility that the liquid may adhere again, the laser beam A is applied to a portion 11b extending around the step 11a of the liquid inlet 11. Thereby, the filling port 1
Even if the electrolyte adheres to the periphery of the first step portion 11a, the distance to the sealing weld 14 becomes longer, and the possibility of the electrolyte reattaching becomes extremely low.

【００２４】そして、レーザビームＡが照射された照射
領域１２には封止溶接で溶融する部分以外にもレーザビ
ームＡが照射された痕跡が残るため、この痕跡を目視等
により確認することにより、封止溶接の前処理が行われ
た否か、あるいはその位置が正確であるか否かを容易に
確認することができるようになるため、前処理工程の管
理が容易になる。In the irradiation area 12 irradiated with the laser beam A, a trace of the irradiation of the laser beam A remains in a portion other than a portion to be melted by the sealing welding, and the trace is confirmed by visual observation or the like. Since it is possible to easily confirm whether or not the pre-processing of the sealing welding has been performed, or whether or not the position thereof is accurate, the management of the pre-processing step is facilitated.

【００２５】変形例 上述した実施形態においては、注液口１１に段部１１ａ
を設け、断面形状がＴ字状でフランジ部１３ａを備えた
液口栓１３を注液口１１に挿入して、フランジ部１３ａ
を段部１１ａに嵌合させた後、液口栓１３と注液口１１
との境界部に沿ってレーザビームＢを照射しながら走査
することで、液口栓１３と注液口１１とを封止溶接して
溶接部１４を形成する例について説明したが、注液口お
よび液口栓に各種の変更を加えることが可能である。Modification In the above-described embodiment, the liquid inlet 11 has a step 11a.
A liquid port plug 13 having a T-shaped cross section and having a flange portion 13a is inserted into the injection port 11, and the flange portion 13a
Is fitted to the step 11a, and then the liquid stopper 13 and the liquid inlet 11 are connected.
The liquid port plug 13 and the liquid injection port 11 are sealed and welded to form the welded portion 14 by scanning while irradiating the laser beam B along the boundary portion of the liquid injection port. Various changes can be made to the liquid stopper.

【００２６】図３は第１変形例の封口体に設けられた注
液口にゴム栓と液口蓋を載置した後に溶接する工程を示
す断面図である。本変形例の封口体１０は、Ａｌ−Ｍｎ
系合金板を外装缶１０Ａの開口部の形状に合うように打
ち抜かれており、その中央部に図示しない負極端子を配
設し、この負極端子の側部に注液口１５を配設してい
る。注液口１５には上述した実施形態のように段部は設
けられていない。FIG. 3 is a cross-sectional view showing a process of welding after placing a rubber stopper and a liquid port lid on a liquid injection port provided in a sealing member of a first modified example. The sealing body 10 of this modification is made of Al-Mn.
A system alloy plate is punched out so as to conform to the shape of the opening of the outer can 10A, and a negative terminal (not shown) is provided at the center thereof, and a liquid inlet 15 is provided at a side of the negative terminal. I have. The injection port 15 is not provided with a step as in the above-described embodiment.

【００２７】そして、外装缶１０Ａの開口部に封口体１
０を載置してその周囲を外装缶に溶接して封口した後、
注液口１５内に上述した実施形態と同様な電解液を注入
する。電解液の注液後、注液口１５の周囲、即ち、後述
する液口蓋１７のフランジ部１７ｂが配設される部位よ
り若干広い１５ａ〜１５ｂまでの範囲に、図示しないレ
ーザビーム照射装置よりレーザビームＡを照射して、電
解液の注入時に飛散して付着した電解液を蒸発させて除
去するとともに、電解液雰囲気によりできた表面酸化被
膜（被覆物）を照射層１６を形成して除去する。ここ
で、レーザビームＡの照射条件も上述した実施形態と同
様である。The sealing body 1 is inserted into the opening of the outer can 10A.
After placing 0 and welding the periphery to the outer can and sealing it,
The same electrolyte solution as in the above-described embodiment is injected into the injection port 15. After the injection of the electrolytic solution, a laser beam from a laser beam irradiation device (not shown) Irradiation with the beam A is performed to evaporate and remove the electrolytic solution scattered and adhered at the time of the injection of the electrolytic solution, and to remove the surface oxide film (coating) formed by the electrolytic solution atmosphere by forming the irradiation layer 16. . Here, the irradiation conditions of the laser beam A are the same as those in the above-described embodiment.

【００２８】ついで、注液口１５の上部にゴム栓１７ａ
を載置した後、Ａｌ−Ｍｎ系合金製で中央部に凸部１７
ｃ（なお、この凸部１７ｃ内にゴム栓１７ａが収納され
る）を備えるとともに、その周囲にフランジ部１７ｂを
備えた液口蓋１７を被せ、フランジ部１７ｂの周辺部に
沿ってレーザビームを照射しながら走査することで、液
口蓋１７を注液口１５に封止溶接して溶接部１８を形成
する。Next, a rubber stopper 17a is provided above the injection port 15.
Is placed, and a convex portion 17 made of an Al-Mn alloy is provided at the center.
c (the rubber plug 17a is accommodated in the convex portion 17c), and a liquid port lid 17 having a flange portion 17b is put on the periphery thereof, and a laser beam is irradiated along the peripheral portion of the flange portion 17b. While scanning, the liquid port lid 17 is sealed and welded to the liquid injection port 15 to form a welded portion 18.

【００２９】このように液口蓋１７と注液口１５との封
止溶接工程の前工程として、レーザビームＡを注液口１
５の周囲に照射しても、レーザビームＡが照射された照
射領域１６には溶接不良の原因となる残留物等がなくな
るため、この照射領域１６内にて封止溶接を行うと、溶
接不良率は約０．１％以下に減少した。このように封止
溶接しても、レーザビームＡが照射された照射領域１６
には封止溶接で溶融する部分以外にもレーザビームＡが
照射された痕跡が残るため、この痕跡を目視等により確
認することにより、封止溶接の前処理が行われた否か、
あるいはその位置が正確であるか否かを容易に確認する
ことができるようになるため、前処理工程の管理が容易
になる。As described above, the laser beam A is applied to the injection port 1 as a pre-process of the sealing welding process between the liquid port lid 17 and the injection port 15.
Even when the laser beam A is irradiated around the laser beam A, the irradiation area 16 irradiated with the laser beam A has no residue or the like that causes welding failure. The rate decreased to less than about 0.1%. Even if the sealing welding is performed in this manner, the irradiation region 16 irradiated with the laser beam A
Since the trace irradiated with the laser beam A also remains in the portion other than the portion that is melted by the sealing welding, by confirming this trace visually or the like, whether or not the pretreatment of the sealing welding was performed,
Alternatively, since it is possible to easily confirm whether or not the position is correct, the management of the pretreatment process is facilitated.

【００３０】図４（ａ）は上述した実施形態の第２変形
例を示す図である。本第２変形例の液口栓１９はＡｌ−
Ｍｎ系合金を球形に形成しており、上述と同様に封止溶
接の前処理としての注液口の周囲にレーザビームＡ（図
示せず）を照射した後、球形の液口栓１９を注液口に載
置した後、液口栓１９を注液口に封止溶接するようにす
る。FIG. 4A shows a second modification of the above-described embodiment. The liquid port plug 19 of the second modification is made of Al-
A Mn-based alloy is formed in a spherical shape, and a laser beam A (not shown) is irradiated around a liquid injection port as a pretreatment for sealing welding in the same manner as described above, and then a spherical liquid port plug 19 is injected. After placing on the liquid port, the liquid port plug 19 is sealed and welded to the liquid injection port.

【００３１】図４（ｂ）は上述した実施形態の第３変形
例を示す図である。本第３変形例においては、注液口の
下部に遮蔽部材１０ａを配設し、レーザビームＡ（図示
せず）を注液口の近傍に照射しても、レーザビームＡが
注液口内部に入射されることを防止するようにしてい
る。このように、レーザビームＡが注液口内部に入射さ
れることを防止するようにすると、発電要素が損傷する
ことが防止できるようになる。そして、発電要素が損傷
することが防止できるようになることから、レーザビー
ムＡの走査を正確に行う必要がなくなるので、レーザビ
ームＡを走査するための制御が容易になる。FIG. 4B shows a third modification of the above-described embodiment. In the third modification, even if the shielding member 10a is disposed below the liquid injection port and the vicinity of the liquid injection port is irradiated with the laser beam A (not shown), the laser beam A is irradiated inside the liquid injection port. To prevent the light from being incident on the device. As described above, when the laser beam A is prevented from being incident on the inside of the liquid inlet, damage to the power generating element can be prevented. Then, since the power generation element can be prevented from being damaged, it is not necessary to perform the scanning of the laser beam A accurately, so that the control for scanning the laser beam A becomes easy.

【００３２】上述したように、本発明においては、封止
溶接工程の前処理として注液口１１，１５の各溶接部お
よびその近傍にレーザビームＡを照射して、電解液の注
入時に飛散して付着した電解液を蒸発させて除去すると
ともに、電解液雰囲気によりできた表面酸化被膜（被覆
物）を照射層１２，１６を形成して除去するようにして
いるので、付着した電解液あるいは酸化被膜等の被覆材
が液口栓１３あるいは液口蓋１７内に閉じ込められるこ
とがなくなって溶接不良を生じることはない。このた
め、溶接溶融部１４あるいは１８に気孔やピンホールが
形成されることが防止できるようになる。As described above, in the present invention, the laser beam A is applied to each of the welded portions of the injection ports 11 and 15 and the vicinity thereof as a pretreatment of the sealing welding step, and the laser beam A is scattered when the electrolyte is injected. The deposited electrolyte is evaporated and removed, and the surface oxide film (coating) formed by the electrolyte atmosphere is removed by forming the irradiation layers 12 and 16. A coating material such as a coating is not confined in the liquid port plug 13 or the liquid port lid 17, so that poor welding does not occur. Therefore, it is possible to prevent pores and pinholes from being formed in the weld fusion portion 14 or 18.

【００３３】なお、上述した実施形態および変形例にお
いては、封口体１０に注液口１１あるいは１５を設ける
例について説明したが、注液口を外装缶に設けるように
してもよい。また、上述した実施形態および変形例にお
いては、注液口１１と液口栓１３あるいは注液口１５と
液口蓋１７とをレーザビームを照射して封止溶接する例
について説明したが、これらを抵抗溶接により封止溶接
するようにしてもよい。In the above-described embodiment and modified examples, the example in which the liquid inlet 11 or 15 is provided in the sealing body 10 has been described. However, the liquid inlet may be provided in the outer can. Further, in the above-described embodiment and the modified examples, the example in which the injection port 11 and the liquid port plug 13 or the injection port 15 and the liquid port lid 17 are sealed and welded by irradiating a laser beam has been described. Seal welding may be performed by resistance welding.

【図面の簡単な説明】[Brief description of the drawings]

【図１】 外装缶に封口体を取り付けた状態の外観を示
す図である。FIG. 1 is a view showing the appearance of a state in which a sealing body is attached to an outer can.

【図２】 封口体に設けられた注液口に液口栓を溶接す
る工程を示す断面図である。FIG. 2 is a cross-sectional view showing a step of welding a liquid port plug to a liquid injection port provided in a sealing body.

【図３】 封口体に設けられた注液口に液口栓を溶接す
る変形例の工程を示す断面図である。FIG. 3 is a cross-sectional view showing a process of a modification in which a liquid port plug is welded to a liquid injection port provided in a sealing body.

【図４】 液口栓および注液口の変形例を示す断面図で
ある。FIG. 4 is a sectional view showing a modified example of the liquid port stopper and the liquid injection port.

【図５】 従来例の封口体に設けられた注液口に液口栓
を溶接する工程を示す断面図である。FIG. 5 is a cross-sectional view showing a step of welding a liquid port plug to a liquid injection port provided in a conventional sealing body.

【符号の説明】[Explanation of symbols]

１０Ａ…外装缶（正極端子）、１０…封口体、１１…注
液口、１１ａ…段部、１２…照射層、１３…液口栓、１
３ａ…フランジ部、１４…溶接部、１５…注液口、１６
…照射層、１７…液口蓋、１７ａ…ゴム栓、１７ｂ…フ
ランジ部、１７ｃ…凸部、１８…溶接部、１９…球形液
口栓、１０ａ…遮蔽部材10A: Outer can (positive electrode terminal), 10: Sealing body, 11: Liquid inlet, 11a: Step, 12: Irradiation layer, 13: Liquid stopper, 1
3a: flange portion, 14: welded portion, 15: liquid inlet, 16
... Irradiation layer, 17 ... Liquid lid, 17a ... Rubber stopper, 17b ... Flange part, 17c ... Protrusion, 18 ... Welded part, 19 ... Spherical liquid stopper, 10a ... Shielding member

───────────────────────────────────────────────────── フロントページの続き (72)発明者 細川 弘 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 南野 弘史 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 Ｆターム(参考） 5H011 AA17 CC06 DD13 FF02 HH03 HH08 5H023 AA03 BB00 BB03 5H024 AA01 AA12 BB03 BB14 CC02 DD01 DD03 FF11 FF15 5H028 AA01 AA07 BB00 BB01 BB02 BB03 BB05 EE01 EE06  ──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Hiroshi Hosokawa 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Hirofumi Nanno 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. F term (reference) 5H011 AA17 CC06 DD13 FF02 HH03 HH08 5H023 AA03 BB00 BB03 5H024 AA01 AA12 BB03 BB14 CC02 DD01 DD03 FF11 FF15 5H028 AA01 AA07 BB00 BB01 BB02 BB01 BB02 BB01 BB02 BB01 BB05

Claims (7)

【特許請求の範囲】[Claims] 【請求項１】 金属製外装缶の開口に金属製封口体を載
置してこの封口体と前記外装缶との境界部をシーム溶接
して封缶する封口工程と、前記封口体あるいは前記外装
缶に設けられた注液口より電解液を注入する電解液注入
工程と、前記注液口に封止部材を挿入してこの封止部材
と前記注液口との境界部を溶接して封止する溶接工程と
を備えた密閉型電池の製造方法であって、 前記溶接工程の前処理として前記注液口の溶接部および
その近傍に付着する付着物あるいは前記注液口の溶接部
近傍に被覆された被覆物を除去する除去工程を備えるよ
うにしたことを特徴とする密閉型電池の製造方法。A sealing step of placing a metal sealing body on an opening of a metal outer can and seam welding a boundary portion between the sealing body and the outer can to seal the can; An electrolyte injecting step of injecting an electrolyte from an inlet provided in the can, and inserting a sealing member into the inlet and welding and sealing a boundary between the sealing member and the inlet. And a welding step of stopping the welding step, wherein as a pre-treatment of the welding step, an adhering substance adhering to the welded portion of the injection port and the vicinity thereof or the vicinity of the welded portion of the injection port is provided. A method for manufacturing a sealed battery, comprising a removing step of removing a coated material. 【請求項２】 前記除去工程はエネルギービームを照射
する工程であることを特徴とする請求項１に記載の密閉
型電池の製造方法。2. The method according to claim 1, wherein the removing step is a step of irradiating an energy beam. 【請求項３】 前記エネルギービームはレーザビームで
あることを特徴とする請求項２に記載の密閉型電池の製
造方法。3. The method according to claim 2, wherein the energy beam is a laser beam. 【請求項４】 前記金属製外装缶は有底角筒状の外装缶
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
かに記載の密閉型電池の製造方法。4. The method for producing a sealed battery according to claim 1, wherein the metal outer can is a bottomed rectangular cylindrical outer can. 【請求項５】 前記注液口に段部を備え、断面形状がＴ
字状でフランジ部を備えた液口栓を前記注液口に挿入し
て前記段部内に前記フランジ部を嵌合させた後、前記段
部と前記フランジ部との境界部を封止溶接するようにし
たことを特徴とする請求項１から請求項４のいずれかに
記載の密閉型電池の製造方法。5. A step portion is provided in the liquid inlet, and a cross-sectional shape is T.
After inserting a liquid port plug having a U-shaped flange portion into the liquid inlet and fitting the flange portion into the step portion, the boundary portion between the step portion and the flange portion is sealed and welded. The method for manufacturing a sealed battery according to any one of claims 1 to 4, wherein: 【請求項６】 前記注液口にゴム栓を載置した後、前記
ゴム栓が収納される凹部を中央部に備えるとともにその
周囲にフランジ部を備えた液口蓋を被せた後、フランジ
部の周辺部と注液口の周囲とを封止溶接するようにした
ことを特徴とする請求項１から請求項４のいずれかに記
載の密閉型電池の製造方法。6. A rubber stopper is placed on the liquid inlet, a concave portion for accommodating the rubber stopper is provided at a central portion, and a liquid port cover provided with a flange portion is placed around the concave portion. The method for producing a sealed battery according to any one of claims 1 to 4, wherein the peripheral portion and the periphery of the liquid inlet are sealed and welded. 【請求項７】 前記注液口の下部に遮蔽部材を配設し、
レーザビームを注液口の近傍に照射しても、レーザビー
ムが注液口内部に入射されることを防止するようにした
ことを特徴とする請求項３から請求項６のいずれかに記
載の密閉型電池の製造方法。7. A shielding member is provided below the liquid inlet,
The laser beam according to any one of claims 3 to 6, wherein the laser beam is prevented from being incident on the inside of the injection port even when the laser beam is applied to the vicinity of the injection port. Manufacturing method of sealed battery.
JP10184705A 1998-06-30 1998-06-30 Manufacture of sealed battery Pending JP2000021437A (en)

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