JPH08315790A - Welding method of sealed vessel of square battery - Google Patents
Welding method of sealed vessel of square batteryInfo
- Publication number
- JPH08315790A JPH08315790A JP7331899A JP33189995A JPH08315790A JP H08315790 A JPH08315790 A JP H08315790A JP 7331899 A JP7331899 A JP 7331899A JP 33189995 A JP33189995 A JP 33189995A JP H08315790 A JPH08315790 A JP H08315790A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- laser
- temporary fixing
- case
- prismatic
- 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
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
Landscapes
- Laser Beam Processing (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
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、角形電池の密閉容
器の溶接方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for welding a closed container of a prismatic battery.
【０００２】[0002]
【従来の技術】特公平６ー５４６６０号公報に開示され
る密閉型の角形電池は、金属からなる角形ケースの一端
に形成された開口に金属板からなる蓋板を嵌入し、蓋板
の外周縁を角形ケースの開口端縁に突き合わせた状態で
これら嵌合部をレーザー溶接して角形電池の密閉容器を
形成しており、特に、レーザー照射開始の所定時間前か
ら角形ケースを載置したテーブルの移動を開始し、か
つ、レーザー照射終了部位を過ぎても所定時間テーブル
の移動を持続して、溶接領域各部を均一の溶接速度で溶
接することを提案している。2. Description of the Related Art In a closed prismatic battery disclosed in Japanese Patent Publication No. 6-54660, a lid plate made of a metal plate is fitted in an opening formed at one end of a rectangular case made of metal, and the lid plate is placed outside the lid plate. These fittings are laser-welded to form a closed container for the prismatic battery with the peripheral edge abutting the opening edge of the prismatic case, and in particular, a table on which the prismatic case is placed from a predetermined time before the start of laser irradiation. It is proposed that the movement of the table is started and the movement of the table is continued for a predetermined time even after passing the laser irradiation end portion to weld each part of the welding area at a uniform welding speed.
【０００３】なお、このような角形電池は円筒形電池に
比べてスペース使用効率が優れており、また、レーザー
溶接は他の溶接方式に比較して電解液や電気絶縁部分な
どに対する熱的影響が少なく作業効率が優れるという利
点を有している。Such prismatic batteries are more efficient in space use than cylindrical batteries, and laser welding has a greater thermal effect on the electrolytic solution and electrically insulating parts than other welding methods. It has the advantage that the work efficiency is low and it is excellent.
【０００４】[0004]
【発明が解決しようとする課題】上記した公報に開示さ
れるように、従来の角形電池の密閉容器の溶接において
は、金属からなる角形ケースの一端に形成された開口に
金属板からなる蓋板を嵌入し、嵌合部をレーザー溶接し
ている。しかしながら、溶接後の密閉容器の検査におい
て、溶接部からの電解液の漏洩や溶接部の耐圧不足が発
見される場合があった。As disclosed in the above-mentioned publication, in the conventional welding of a closed container of a prismatic battery, a lid plate made of a metal plate is formed in an opening formed at one end of a prismatic case made of metal. Is fitted and the fitting part is laser-welded. However, in the inspection of the hermetically sealed container after welding, leakage of the electrolytic solution from the welded portion or insufficient pressure resistance of the welded portion may be found.
【０００５】本発明者らは、溶接不良品の分解、断面観
察からこのような密閉不良が以下の原因に基づくことを
発見した。まず図５に示すように、角形ケース１の上端
の開口１０に蓋板２を嵌入し、蓋板２の外周縁を角形ケ
ース１の開口１０の内周（開口端縁）に突き合わせた状
態を保ちつつこれら嵌合部の所定部位を溶接すると、溶
接部位における角形ケース１の蓋板係止性が低下するた
めに、溶接部位において蓋板２が角形ケース１の内側へ
落ち込んだり、またはその反動により溶接部位の反対側
において蓋板２が角形ケース１の外側へ持ち上げられた
りして蓋板２が図５に示すように斜めにずれてしまい
（以下、平行度の悪化ともいう）、これらの結果として
上記した溶接不良が生じる場合があることが判明した。The present inventors have found from the disassembly and cross-section observation of defective welding products that such defective sealing is based on the following causes. First, as shown in FIG. 5, a state where the lid plate 2 is fitted into the opening 10 at the upper end of the rectangular case 1 and the outer peripheral edge of the lid plate 2 is butted against the inner circumference (opening edge) of the opening 10 of the rectangular case 1 is shown. If the predetermined parts of these fitting parts are welded while keeping the same, the lid plate locking property of the rectangular case 1 at the welded part is deteriorated, so that the lid plate 2 falls inside the rectangular case 1 at the welded part or its reaction. As a result, the cover plate 2 is lifted to the outside of the rectangular case 1 on the side opposite to the welded part, and the cover plate 2 shifts obliquely as shown in FIG. 5 (hereinafter, also referred to as deterioration of parallelism). As a result, it has been found that the above-mentioned welding failure may occur.
【０００６】次に図６に示すように、角形ケース１の上
端の開口１０に蓋板２を嵌入し、蓋板２の外周縁を角形
ケース１の開口１０の内周（開口端縁）に突き合わせた
状態を保ちつつこれら嵌合部の所定部位を溶接すると、
溶接部位に向けて蓋板２が偏り、この結果として溶接部
位の反対側において蓋板２の外周縁と角形ケース１の開
口端縁との間のクリアランスが増加し、これにより上記
した溶接不良が生じる場合があることが判明した。Next, as shown in FIG. 6, the cover plate 2 is fitted into the opening 10 at the upper end of the rectangular case 1, and the outer peripheral edge of the cover plate 2 is made the inner periphery (opening edge) of the opening 10 of the rectangular case 1. Welding the predetermined parts of these fitting parts while keeping the butted state,
The cover plate 2 is biased toward the welded part, and as a result, the clearance between the outer peripheral edge of the cover plate 2 and the opening end edge of the rectangular case 1 is increased on the side opposite to the welded part. It turns out that this may happen.
【０００７】本発明は上記問題点に鑑みなされたもので
あり、溶接に伴う角形ケースに対する蓋板の相対変位に
基づく溶接不良を低減可能な角形電池の密閉容器の溶接
方法を提供することを、その目的としている。The present invention has been made in view of the above problems, and it is an object of the present invention to provide a welding method for a sealed container of a prismatic battery, which can reduce welding defects due to relative displacement of a lid plate with respect to a prismatic case due to welding. Its purpose is.
【０００８】[0008]
【課題を解決するための手段】請求項１記載の溶接方法
によれば、角形ケースの開口に蓋板を嵌入して嵌合部を
レーザー溶接して密閉容器を形成する。本構成では更
に、溶接すべき嵌合部全周の内の３箇所以上を仮止めし
た後で全周を本溶接するとともに、仮止め箇所のすくな
くとも一つを他の仮止め箇所と異なる辺部に設定するの
で、本溶接時における蓋板の所定部分の溶融などの物理
的影響などにより蓋板が傾いて平行度が悪化し、これに
より特に溶接不良が生じるのを防止することができる。
すなわち、蓋板の所定部位が溶融してこの溶融部位にお
いて角形ケースによる蓋板の係止性が低下しても、蓋板
は上記した仮溶接により面的に角形ケースに係止されて
いるので、蓋板が傾くことがなく、それにより溶接が不
良となって密閉性や耐圧が低下することがない。According to the welding method of the first aspect, the lid plate is fitted into the opening of the rectangular case and the fitting portion is laser-welded to form the closed container. In this configuration, further, three or more parts of the entire circumference of the fitting part to be welded are temporarily fixed and then the entire circumference is main-welded, and at least one of the temporary fixing parts is a side part different from other temporary fixing parts. Therefore, it is possible to prevent the lid plate from being inclined due to a physical influence such as melting of a predetermined portion of the lid plate during the main welding and deteriorating the parallelism.
That is, even if a predetermined portion of the lid plate is melted and the locking property of the lid plate by the rectangular case is lowered at this melting part, the lid plate is planarly locked to the rectangular case by the above-described temporary welding. In addition, the lid plate does not tilt, so that welding does not become defective and the hermeticity and pressure resistance do not decrease.
【０００９】請求項２記載の溶接方法によれば請求項１
記載の溶接方法において更に、仮止めをレーザー溶接に
より実施するので、仮止めと本溶接とを同一装置で実行
でき、装置構成及びその制御が簡単となる。請求項３記
載の溶接方法によれば請求項１又は２記載の溶接方法に
おいて更に、嵌合部の所定の一辺を仮止めした後、それ
と平行な（対向する）嵌合部の辺部を仮止めするので、
バランスがよく、蓋板のずれを防止することができる。According to the welding method of claim 2, claim 1
Furthermore, in the welding method described above, the temporary fixing is performed by laser welding, so that the temporary fixing and the main welding can be performed by the same apparatus, and the apparatus configuration and its control are simplified. According to the welding method according to claim 3, in the welding method according to claim 1 or 2, further, after temporarily fixing a predetermined side of the fitting portion, a side portion of the fitting portion parallel (opposing) to the temporary side is temporarily fixed. I will stop
The balance is good and it is possible to prevent the lid plate from shifting.
【００１０】請求項４記載の溶接方法によれば請求項３
記載の溶接方法において更に、互いに対向する一対の辺
部を順次溶接後、互いに対向する他の一対の辺部を順次
溶接するので、仮止めが強固となりかつ蓋板のずれ防止
性が向上する。請求項５記載の溶接方法によれば角形ケ
ースの開口に蓋板を嵌入して嵌合部をレーザー溶接して
密閉容器を形成する。本構成では更に、開口を貫く角形
ケースの中心軸を中心として略１８０度回転対称となる
一対の溶接部位へレーザー光を略同時照射してレーザー
溶接を行う。According to the welding method of claim 4, claim 3
Further, in the welding method described above, after the pair of side portions facing each other are sequentially welded, the other pair of side portions facing each other are sequentially welded, so that the temporary fixing becomes strong and the displacement prevention property of the cover plate is improved. According to the welding method of the fifth aspect, the cover plate is fitted into the opening of the rectangular case, and the fitting portion is laser-welded to form the closed container. In this configuration, furthermore, laser welding is performed by irradiating a pair of welding portions, which are rotationally symmetrical about 180 degrees about the central axis of the rectangular case penetrating the opening, with laser light at substantially the same time.
【００１１】このようにすれば、上述した溶接部位と反
対側における蓋板と角形ケースとの間のクリアランス増
大を相殺でき、このクリアランス増大に起因する溶接不
良による密閉性や耐圧の低下を防止することができる。
請求項６記載の溶接方法によれば、Ｘ、Ｙテーブルの駆
動によりレーザービームのスポットの走査を行うので、
走査が簡単となる。また順番に嵌合部の四辺を仮止めす
るので、嵌合部のずれが生じにくい。With this configuration, the increase in the clearance between the cover plate and the rectangular case on the side opposite to the welded portion can be offset, and the decrease in the sealing property and the pressure resistance due to the welding failure due to the increase in the clearance can be prevented. be able to.
According to the welding method of claim 6, since the spot of the laser beam is scanned by driving the X and Y tables,
Scanning becomes easy. Further, since the four sides of the fitting portion are temporarily fixed in order, the fitting portion is unlikely to shift.
【００１２】請求項７記載の溶接方法によれば請求項１
乃至５記載の溶接方法において更に、蓋板を圧入により
ケースの開口に嵌合するので、仮止め時やその前に蓋板
がずれることを抑止することができるAccording to the welding method of claim 7, claim 1
Further, in the welding method according to any one of 5 to 5, since the lid plate is fitted into the opening of the case by press fitting, it is possible to prevent the lid plate from being displaced at the time of temporary fixing or before it.
【００１３】[0013]
【発明の実施の形態】以下、実施例に基づいて好適な実
施態様を説明する。 （実施例１）本発明の角形電池の密閉容器の溶接方法の
一実施例を図１及び図３を参照して説明する。BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments will be described below based on Examples. (Embodiment 1) An embodiment of a method for welding a closed container of a prismatic battery of the present invention will be described with reference to FIGS. 1 and 3.
【００１４】本実施例の溶接方法が適用される角形電池
を図３に示す。この電池の密閉容器は角形ケース１と、
この角形ケース１の上端の開口に嵌入され、レーザー溶
接されてこの開口を密閉する蓋板２とからなる。角形ケ
ース１は、角箱形状を有し、ニッケルめっき鋼板を成形
してなる。角形ケース１内には、図４に示す電池要素
９、すなわち、リチウムコバルト酸化物からなる正極活
物質、セパレータ、カーボンからなる負極活物質及び非
水系電解液が収容されている。FIG. 3 shows a prismatic battery to which the welding method of this embodiment is applied. The sealed container of this battery is a square case 1,
A lid plate 2 is fitted in the opening at the upper end of the rectangular case 1 and laser-welded to seal the opening. The rectangular case 1 has a rectangular box shape and is formed by molding a nickel-plated steel plate. In the rectangular case 1, the battery element 9 shown in FIG. 4, that is, the positive electrode active material made of lithium cobalt oxide, the separator, the negative electrode active material made of carbon, and the non-aqueous electrolyte solution are accommodated.
【００１５】蓋板２は、上記開口に圧入により嵌入され
たニッケルめっき鋼板（周縁はめっきなし）からなり、
角形ケース１の開口に嵌め込まれた後、蓋板２の外周縁
を角形ケース１の開口の内周（開口端縁）に突き合わせ
た状態を保ちつつこれら嵌合部を全周にわたって、溶接
対象を固定したＸ−Ｙテーブル並びに照射位置を固定し
たレーザー発振器からなるパルス式ＹＡＧレーザー溶接
機で溶接されて、角形ケース１とともに密閉容器を構成
している。The cover plate 2 is made of a nickel-plated steel plate (the periphery of which is not plated) fitted into the opening by press fitting,
After being fitted into the opening of the rectangular case 1, while keeping the outer peripheral edge of the lid plate 2 in contact with the inner circumference (opening end edge) of the opening of the rectangular case 1, these fitting parts are welded over the entire circumference. It is welded by a pulse type YAG laser welding machine composed of a fixed XY table and a laser oscillator whose irradiation position is fixed, and constitutes a closed container together with the rectangular case 1.
【００１６】以下、溶接工程を詳細に説明する。まず、
図１（ａ）に示すように、蓋板２の外周縁を角形ケース
１の開口１０の内周（開口端縁）に突き合わせた状態を
保ちつつこれら嵌合部３を４箇所の仮止め部位４１〜４
４で仮止めした。仮止め時の上記パルス式ＹＡＧレーザ
ー溶接機のパルス出力はその後の本溶接時のパルス出力
と同じとし、パルス数は１としたが、パルス出力及びパ
ルス数の変更は当然可能である。The welding process will be described in detail below. First,
As shown in FIG. 1 (a), while maintaining the state where the outer peripheral edge of the lid plate 2 is abutted against the inner periphery (opening edge) of the opening 10 of the rectangular case 1, these fitting portions 3 are temporarily fixed at four positions. 41-4
It was temporarily fixed at 4. The pulse output of the pulse type YAG laser welding machine at the time of temporary fixing is the same as the pulse output at the time of the subsequent main welding, and the number of pulses is set to 1. However, the pulse output and the number of pulses can of course be changed.
【００１７】なお、この実施例では、角部３０が所定曲
率とされた長方形状を有する嵌合部３の直線状の各辺３
１〜３４の好ましくはそれらの各中央部を各１箇所づつ
仮止めしたが、仮止め部位４１〜４４の合計は３個以上
であればよい。ただし、仮止めにより安定に蓋板２を係
止するために、各仮止め部位４１〜４４を結ぶことによ
りすくなくとも三角形またはそれ以上の多角形が形成さ
れる必要があり、このために少なくとも一つの仮止め部
位４１〜４４は他の仮止め部位４１〜４４とは異なる辺
に配置される必要がある。これにより蓋板２は角形ケー
ス１に安定に仮止めされる。In this embodiment, each linear side 3 of the fitting portion 3 having a rectangular shape with a corner 30 having a predetermined curvature.
Preferably, each of the central portions of Nos. 1 to 34 is temporarily fixed to each one position, but the total number of the temporary fixing portions 41 to 44 may be three or more. However, in order to stably lock the cover plate 2 by temporary fixing, it is necessary to form at least a triangle or a polygonal shape by connecting the temporary fixing portions 41 to 44, and for this reason, at least one polygon is required. The temporary fixing portions 41 to 44 need to be arranged on different sides from the other temporary fixing portions 41 to 44. As a result, the cover plate 2 is temporarily temporarily fixed to the rectangular case 1.
【００１８】好ましくは、仮止めは、まず嵌合部３の辺
部３１上の所定点を仮止めした後、その対向位置である
辺部３３上の所定点を仮止めし、次に辺部３２上の所定
点を仮止めし、最後に辺部３４上の所定点を仮止めす
る。このようにすれば、仮止め時における蓋板２の浮き
上がりや傾斜を良好に防止することができる。更に好ま
しくは、仮止めは、まず仮止め部位４１を仮止めした
後、その対向位置である仮止め部位４３を仮止めし、次
に残る二辺の仮止め予定部位の内のどちらかである仮止
め部位４２を仮止めした後、その対向位置である仮止め
部位４４を仮止めする。なお、仮止め部位４１は辺部３
１の中央位置であり、対向する仮止め部位４３とほぼ１
８０度離れて設定されている。同様に、仮止め部位４２
は辺部３２の中央位置であり、対向する仮止め部位４４
とほぼ１８０度離れて設定されている。このようにすれ
ば、仮止め部位４１〜４４がそれぞれの辺部３１〜３４
の中央に位置し、更に直後に仮止めされる仮止め部位が
直前の仮止め部位に対して１８０度離れて位置するの
で、蓋板２のずれや傾斜をもっとも良好に抑止すること
ができる。Preferably, in the temporary fixing, first, a predetermined point on the side portion 31 of the fitting portion 3 is temporarily fixed, then a predetermined point on the side portion 33, which is an opposing position, is temporarily fixed, and then the side portion. A predetermined point on 32 is temporarily fixed, and finally a predetermined point on the side portion 34 is temporarily fixed. By doing so, it is possible to favorably prevent the lid plate 2 from being lifted or tilted at the time of temporary fixing. More preferably, the temporary fixing is performed by first temporarily fixing the temporary fixing portion 41, then temporarily fixing the opposing position of the temporary fixing portion 43, and then either of the two remaining temporary fixing portions. After temporarily fixing the temporarily fixed portion 42, the temporarily fixed portion 44, which is the opposing position, is temporarily fixed. The temporary fixing portion 41 is the side portion 3.
It is a central position of 1 and is almost 1 with the temporary fixing portion 43 facing each other.
It is set 80 degrees apart. Similarly, the temporary fixing portion 42
Is a central position of the side portion 32, and is a temporary fixing portion 44 facing each other.
Are set approximately 180 degrees apart. With this configuration, the temporary fixing portions 41 to 44 are located at the respective side portions 31 to 34.
Since the temporary fixing portion that is located at the center of the center and is temporarily fixed immediately after is located 180 degrees away from the immediately preceding temporary fixing portion, the displacement and inclination of the cover plate 2 can be most effectively suppressed.
【００１９】なお、これら各仮止め部位４１〜４４を同
時に行ったり、その他、互いに対向する一対の仮止め部
位４１、４３を仮止めした後、残る一対の仮止め部位４
２、４４を仮止めしたりしても同様の効果を奏すること
ができる。この後、図１（ｂ）に示すように、嵌合部３
の所定の溶接開始部位から嵌合部３に沿ってレーザー照
射位置を移動させつつ、パルスレーザーを順次出力して
溶接を行い、密閉を完了する。なお、好適には、上記溶
接開始部位は仮止め部位４１〜４４又はその近傍に設定
しないことが好ましい。すなわち、仮止め部位４１〜４
４が溶接開始部位であると、仮止め部位４１〜４４の仮
止めが溶接により解除されることになり、本溶接による
溶融部位の固化により新たな係止箇所が生じる前に仮止
め部位４１〜４４の数が減少するのが好ましくないから
である。もちろん、仮止め部位４１〜４４の個数が多い
場合にはこのような考慮は不要である。Incidentally, after the temporary fixing portions 41 to 44 are simultaneously performed, or in addition, the pair of temporary fixing portions 41 and 43 facing each other are temporarily fixed, and then the pair of temporary fixing portions 4 remaining.
The same effect can be obtained by temporarily fixing 2, 44. After this, as shown in FIG.
While moving the laser irradiation position along the fitting portion 3 from the predetermined welding start site, the pulse lasers are sequentially output to perform welding and the sealing is completed. In addition, it is preferable that the welding start portion is not set at or near the temporary fixing portions 41 to 44. That is, the temporary fixing portions 41 to 4
If 4 is the welding start portion, the temporary fixing of the temporary fixing portions 41 to 44 will be released by welding, and the temporary fixing portions 41 to 44 will be formed before the new locking portion is generated due to the solidification of the molten portion by the main welding. This is because it is not preferable that the number of 44 is reduced. Of course, such consideration is not necessary when the number of temporary fixing parts 41 to 44 is large.
【００２０】このようにすれば、溶接箇所の近傍におけ
る角形ケース１の蓋板係止力が低下して蓋板２が傾いて
溶接が不良となることがなく、密閉性の向上及び耐圧力
の向上を実現することができる。なお、図３において、
５は蓋板２の中央部に蓋板２から電気絶縁されて固定さ
れた正極ターミナルである。With this configuration, the lid plate locking force of the rectangular case 1 in the vicinity of the welded portion is not lowered, the lid plate 2 is not inclined and welding is not defective, and the sealing performance is improved and the pressure resistance is improved. Improvement can be realized. In addition, in FIG.
Reference numeral 5 denotes a positive electrode terminal which is electrically insulated and fixed to the central portion of the cover plate 2 from the cover plate 2.
【００２１】（実施例２）本発明の溶接方法の他の実施
例を図８を参照して説明する。この実施例では、１台の
ＹＡＧレーザー溶接機から出力されるレーザービームを
分光系（好適にはプリズム）で２分割して２つのビーム
光Ｌａ、Ｌｂとし、これら一対のビーム光Ｌａ、Ｌｂを
角形ケース１の開口を貫く中心軸Ｍを中心として１８０
度回転対称位置にて嵌合部３すなわち溶接領域に照射し
つつ照射位置を移動させる。(Embodiment 2) Another embodiment of the welding method of the present invention will be described with reference to FIG. In this embodiment, a laser beam output from one YAG laser welding machine is divided into two beam lights La and Lb by a spectroscopic system (preferably a prism), and the pair of beam lights La and Lb are combined. 180 around the central axis M passing through the opening of the rectangular case 1
The irradiation position is moved while irradiating the fitting portion 3, that is, the welding region at a rotationally symmetrical position.
【００２２】このようにすれば、蓋板２の両側で同時に
溶接を行うこととなるので、蓋板２が溶融部位に引き寄
せられることにより、溶融部位と反対側において蓋板２
の外周縁と角形ケース１の開口端縁との間のクリアラン
スが増加し、これにより上記した溶接不良が生じる問題
を回避することができ、それに起因する密閉性や耐圧の
劣化を防止することができる。In this way, welding is performed on both sides of the lid plate 2 at the same time, so that the lid plate 2 is attracted to the melting portion, so that the lid plate 2 is on the side opposite to the melting portion.
The clearance between the outer peripheral edge of the rectangular case 1 and the opening edge of the rectangular case 1 increases, thereby avoiding the above-described problem of welding failure, and preventing the resulting deterioration of the hermeticity and pressure resistance. it can.
【００２３】なお、この実施例では、一対の同時溶融箇
所は互いに１８０度回転対称な２箇所としたが、更に１
８０度回転対称な同時溶融箇所対を増加してもよい。ま
た、上記実施例では、１台のＹＡＧレーザー溶接機のレ
ーザービームを分割して一対のレーザービームを形成し
たが、２つのレーザービーム発生装置を用いることも当
然可能である。In this embodiment, the pair of simultaneous melting points are two points which are rotationally symmetrical to each other by 180 degrees.
The number of pairs of simultaneous melting points having 80-degree rotational symmetry may be increased. Further, in the above embodiment, the laser beam of one YAG laser welding machine was divided to form a pair of laser beams, but it is naturally possible to use two laser beam generators.
【００２４】更に上記実施例１では、レーザー光の方を
移動させたが、もちろん容器側を移動させてもよい。溶
接条件は、パルス密度が１０個／ｍｍで図４に示すよう
にデフォーカス状態で溶融領域をやや幅広にして位置合
わせ誤差による悪影響を防止した。ただ、溶融領域の端
は図４に示すように、角形ケース１の外周縁１１に達し
ないように配慮した。Further, in the first embodiment, the laser beam was moved, but of course the container side may be moved. The welding conditions were such that the pulse density was 10 pieces / mm and the melting region was made slightly wider in the defocused state as shown in FIG. 4 to prevent adverse effects due to alignment errors. However, as shown in FIG. 4, care was taken so that the end of the melting region did not reach the outer peripheral edge 11 of the rectangular case 1.
【００２５】また更に、上記実施例１の方式で仮止めを
行った後、上記実施例２の同時複数溶接を行うこともで
きる。以下、試験結果を説明する。仮止めを実施せず１
ビームで単独溶接を行う場合（従来）、仮止め後、１ビ
ームで単独溶接を行う場合（試験１）、仮止めを実施せ
ず２ビームで同時複数溶接を行う場合（試験２）の各種
溶接不具合発生確率を調べた。Furthermore, it is also possible to carry out the simultaneous plural welding of the above-mentioned second embodiment after performing the temporary fixing by the method of the above-mentioned first embodiment. The test results will be described below. 1 without temporary fixing
Various welding when performing independent welding with beams (conventional), after performing temporary welding with one beam (test 1), and performing simultaneous welding with two beams without performing temporary fastening (test 2) The probability of failure was investigated.
【００２６】角形ケース１は縦３４ｍｍ、横８．５ｍ
ｍ、高さ４８ｍｍ、角部３２の曲率半径は０．５ｍｍ、
角形ケース１及び蓋板２の肉厚は０．４ｍｍ、パルス密
度１０個／ｍｍ、１パルスのエネルギを２．４Ｊ、レー
ザービーム走査速度を１０ｍｍ／秒、１パルスによる溶
融面積の直径は約０．７ｍｍとして溶接を行った。な
お、試験１においては上記溶接の前に、図１（ａ）の各
仮止め部位４１〜４４を、４１、４３、４２、４４の順
番に仮止めして蓋板２の浮き上がりを防止した。なお、
仮止めの際の溶接条件は、全周溶接の場合と同じとし、
１仮止め部位当たり１パルスを照射した。The rectangular case 1 has a length of 34 mm and a width of 8.5 m.
m, height 48 mm, radius of curvature of corner 32 is 0.5 mm,
The thickness of the rectangular case 1 and the cover plate 2 is 0.4 mm, the pulse density is 10 pieces / mm, the energy of 1 pulse is 2.4 J, the laser beam scanning speed is 10 mm / sec, and the diameter of the melting area by 1 pulse is about 0. Welding was performed with a length of 0.7 mm. In Test 1, before the welding, the temporary fixing portions 41 to 44 in FIG. 1A were temporarily fixed in the order of 41, 43, 42, 44 to prevent the lid plate 2 from floating. In addition,
Welding conditions for temporary fixing are the same as for full circumference welding,
One pulse was irradiated per temporary fixing site.
【００２７】このようにして密封した電池を９０日間放
置して電解液漏れを調べた。試験結果を表１に示す。な
お、試験はそれぞれ５０サンプルずつ実施した。The battery thus sealed was left for 90 days to check for electrolyte leakage. Table 1 shows the test results. The test was carried out for 50 samples each.
【００２８】[0028]
【表１】 なお、この検査結果において、ケース端縁と蓋板との間
のずれが大きいものとは、角形ケース１の端縁と蓋板２
との高さの差が０．０５ｍｍ以上である場合として定義
される。[Table 1] In this inspection result, the case where the gap between the case edge and the lid plate is large means that the edge of the rectangular case 1 and the lid plate 2 are large.
Is defined as the case where the difference in height between and is 0.05 mm or more.
【００２９】また、この検査結果において、溶接欠陥
は、顕微鏡による観察による長さ３０μｍ以上のクラッ
ク及び最大幅が３０μｍ以上の窪みとして定義される。
更に、この検査結果において、溶け込み状態不良とは、
溶接断面をバフ研磨後、硝酸エッチングした後、顕微鏡
にて観察し、３０μｍ以上のブローホールが存在する場
合をいう。なお、ブローホールとは、嵌合部３における
クリアランスが大きくて角形ケース１側の融液と蓋板２
側の融液とが一体化せず、その結果として溶接がなされ
なかった領域を意味する。In this inspection result, the welding defect is defined as a crack having a length of 30 μm or more and a dent having a maximum width of 30 μm or more as observed by a microscope.
Furthermore, in this inspection result, the poor melted state is
After buffing the welded cross section, etching with nitric acid, and observing with a microscope, there is a case where blow holes of 30 μm or more are present. The blow hole has a large clearance in the fitting portion 3 and the melt on the side of the rectangular case 1 and the cover plate 2 are.
It means a region where the melt on the side is not integrated and as a result, welding is not performed.
【００３０】次に、溶接に用いた装置及びその制御につ
いて説明する。図２はＸ、Ｙテーブル６により被溶接対
象である電池組立体１００を移動することにより溶接を
行うパルス式レーザー溶接機の模式斜視図を示し、図７
にその制御例を表すフローチャートを示す。この溶接機
は、溶接対象としての電池組立体１００が載置、固定さ
れてそれぞれ水平なＸ方向及びＹ方向へ変位するＸ、Ｙ
テーブル６と、このＸ、Ｙテーブル６の上方に位置して
垂直にレーザーパルスを照射するレーザー発振器７と、
パソコンから構成されてこれらＸ、Ｙテーブル６及びレ
ーザー発振器７を制御するコントローラ８とからなる。
７０はレーザー発振器７から照射されたレーザービーム
を結像（集光）するための対物レンズである。Next, the apparatus used for welding and its control will be described. FIG. 2 is a schematic perspective view of a pulse type laser welding machine that performs welding by moving the battery assembly 100 to be welded by the X and Y tables 6.
The flowchart showing the control example is shown in FIG. In this welding machine, a battery assembly 100 to be welded is placed and fixed, and is displaced in horizontal X and Y directions, respectively.
A table 6 and a laser oscillator 7 which is located above the X and Y table 6 and vertically emits a laser pulse;
The controller 8 is composed of a personal computer and controls the X and Y tables 6 and the laser oscillator 7.
Reference numeral 70 denotes an objective lens for focusing (focusing) the laser beam emitted from the laser oscillator 7.
【００３１】（制御例）図２のレーザー溶接機を用いた
本実施例の制御例を図７のフローチャートを参照して説
明する。このフローチャートはコントローラ８により実
施される。まず、スタート信号の入力とともにＸ、Ｙテ
ーブル６を駆動して嵌合部３の仮止め部位４１へレーザ
ースポットの中心（対物レンズ７０の焦点）を移動させ
（１００）、その後、パルスを発射して仮止めを行い
（１０２）、次に、Ｘ、Ｙテーブル６を駆動して仮止め
部位４３へレーザースポットの中心（対物レンズ７０の
焦点）を移動させ（１０４）、その後、パルスを発射し
て仮止めを行う（１０６）。次に、Ｘ、Ｙテーブル６を
駆動して仮止め部位４２へレーザースポットの中心（対
物レンズ７０の焦点）を移動させて（１０８）、パルス
を発射して仮止めを行う（１１０）。次に、Ｘ、Ｙテー
ブル６を駆動して仮止め部位４４へレーザースポットの
中心（対物レンズ７０の焦点）を移動させて（１１
２）、パルスを発射して仮止めを行う（１１４）。(Control Example) A control example of this embodiment using the laser welding machine of FIG. 2 will be described with reference to the flowchart of FIG. This flowchart is executed by the controller 8. First, when the start signal is input, the X and Y tables 6 are driven to move the center of the laser spot (the focus of the objective lens 70) to the temporary fixing portion 41 of the fitting portion 3 (100), and then a pulse is emitted. Then, the X and Y tables 6 are driven to move the center of the laser spot (the focus of the objective lens 70) to the temporarily fixed portion 43 (104), and then a pulse is emitted. Then, temporary fixing is performed (106). Next, the X and Y tables 6 are driven to move the center of the laser spot (the focus of the objective lens 70) to the temporary fixing portion 42 (108), and a pulse is emitted to perform temporary fixing (110). Next, the X and Y tables 6 are driven to move the center of the laser spot (the focus of the objective lens 70) to the temporary fixing portion 44 (11
2) Then, a pulse is emitted to temporarily stop (114).
【００３２】仮止め工程終了後、レーザービームのスポ
ット中心を嵌合部３上の本溶接開始地点に移動させ（１
１６）、その後、本溶接ルーチンを実行する。After the temporary fixing process, the spot center of the laser beam is moved to the main welding start point on the fitting portion 3 (1
16) After that, the main welding routine is executed.
【図１】本発明の角形電池の密閉容器の溶接方法の一実
施例を示す説明図であり、（ａ）はその仮止め部位４１
〜４４を仮止めした状態を示す模式平面図であり、
（ｂ）は本溶接を開始した状態を示す模式平面図であ
る。FIG. 1 is an explanatory view showing an embodiment of a method for welding a closed container of a prismatic battery of the present invention, in which (a) is a temporary fixing portion 41 thereof.
It is a schematic plan view showing a state in which ~ 44 is temporarily fixed,
(B) is a schematic plan view showing a state where main welding has started.
【図２】本実施例で用いたレーザー溶接機を示す模式斜
視図である。FIG. 2 is a schematic perspective view showing a laser welding machine used in this example.
【図３】本発明の溶接方法が適用される角形電池の密閉
容器の一例を示す斜視図である。FIG. 3 is a perspective view showing an example of a closed container of a prismatic battery to which the welding method of the present invention is applied.
【図４】実施例１、２の溶接方法で採用したデフォーカ
ス溶融方式を示す説明図である。簡単のために断面ハッ
チングを省略した。FIG. 4 is an explanatory diagram showing a defocus melting method adopted in the welding methods of Examples 1 and 2. Cross-section hatching is omitted for simplicity.
【図５】レーザー溶融時の蓋板２の傾斜発生を示す説明
図である。FIG. 5 is an explanatory diagram showing the occurrence of inclination of the cover plate 2 during laser melting.
【図６】レーザー溶融時の蓋板２と角形ケース１との間
のクリアランス増大状態を示す説明図である。FIG. 6 is an explanatory diagram showing a state in which the clearance between the lid plate 2 and the rectangular case 1 at the time of laser melting is increased.
【図７】本実施例の溶接制御の一例を示すフローチャー
トである。FIG. 7 is a flowchart showing an example of welding control of the present embodiment.
【図８】本発明の角形電池の密閉容器の溶接方法の他実
施例を示す模式平面図である。FIG. 8 is a schematic plan view showing another embodiment of the method for welding the closed container of the prismatic battery of the present invention.
１は角形ケース、２は蓋板。 1 is a rectangular case, 2 is a lid plate.
Claims (7)
た開口に金属板からなる蓋板を嵌入し、前記蓋板と前記
角形ケースとの嵌合部をレーザー溶接して角形電池の密
閉容器を形成する角形電池の密閉容器の溶接方法におい
て、 前記嵌合部の内の互いに離れた３箇所以上の仮止め箇所
を仮止めした後、前記嵌合部の全周をレーザー溶接する
とともに、前記仮止め箇所のすくなくとも一つを他の前
記仮止め箇所と異なる辺部に設定することを特徴とする
角形電池の密閉容器の溶接方法。1. A closed container for a prismatic battery, wherein a lid plate made of a metal plate is fitted into an opening formed at one end of a prismatic case made of metal, and the fitting portion between the lid plate and the prismatic case is laser-welded. In the method for welding a closed container of a prismatic battery for forming the above-mentioned method, after temporarily fixing three or more temporary fixing locations in the fitting portion that are separated from each other, laser welding the entire circumference of the fitting portion, and A method for welding a sealed container for a prismatic battery, characterized in that at least one of the temporary fixing points is set on a side different from other temporary fixing points.
請求項１記載の角形電池の密閉容器の溶接方法。2. The method for welding a closed container of a prismatic battery according to claim 1, wherein the temporary fixing is performed by laser welding.
後、前記第１の辺部と平行な第２の辺部上で次の仮止め
を行い、その後、前記両辺と対向しない第３の辺部上で
次の仮止めを行う請求項１又は２記載の角形電池の密閉
容器の溶接方法。3. A first provisional fastening is performed on the first side portion, a second provisional fastening is performed on a second side portion parallel to the first side portion, and then both sides are attached. The method for welding a closed container of a prismatic battery according to claim 1, wherein the following temporary fixing is performed on the third sides that do not face each other.
後、前記第１の辺部と平行な第２の辺部上で次の仮止め
を行い、その後、前記両辺と対向しない第３の辺部上で
次の仮止めを行った後、前記第３の辺部と平行な第４の
辺部上で次の仮止めを行う請求項３記載の角形電池の密
閉容器の溶接方法。4. A first provisional fastening is performed on the first side portion, a second provisional fastening is performed on a second side portion parallel to the first side portion, and then both sides are attached. The sealed container for the prismatic battery according to claim 3, wherein after the next temporary fixing is performed on the third sides that do not face each other, the next temporary fixing is performed on the fourth side that is parallel to the third side. Welding method.
た開口に金属板からなる蓋板を嵌入し、前記蓋板と前記
角形ケースとの嵌合部をレーザー溶接して角形電池の密
閉容器を形成する角形電池の密閉容器の溶接方法におい
て、 前記開口を貫く前記角形ケースの中心軸を中心として略
１８０度回転対称となる一対の溶接部位へレーザー光を
略同時照射して前記レーザー溶接を行うことを特徴とす
る角形電池の密閉容器の溶接方法。5. A closed container for a prismatic battery, wherein a lid plate made of a metal plate is fitted into an opening formed at one end of a prismatic case made of metal, and the fitting portion between the lid plate and the prismatic case is laser-welded. In a method for welding a closed container of a prismatic battery, the laser welding is performed by irradiating a pair of welding portions that are rotationally symmetrical about 180 degrees about a central axis of the prismatic case that penetrates the opening with laser light at substantially the same time. A method for welding a closed container of a prismatic battery, which is characterized by being performed.
れた前記蓋板とを含む電池組立体をＸ、Ｙテーブルの載
置面上に載置し、 レーザービームの照射位置が前記載置面の所定位置に固
定するように前記テーブルの上方にレーザー発振器を配
設し、 前記テーブルを前記載置面に平行でかつ互いに直交する
Ｘ座標方向及びＹ座標方向に駆動して前記レーザービー
ムのスポットを前記蓋板と前記角形ケースとの嵌合部の
四辺に順次照射して前記四辺を順番に仮止めした後、前
記嵌合部全周にわたって前記レーザービームのスポット
を照射して前記嵌合部全体を溶接することを特徴とする
角形電池の密閉容器の溶接方法。6. A battery assembly including the case and the cover plate fitted in the opening of the case is mounted on a mounting surface of an X, Y table, and the irradiation position of the laser beam is in front. A laser oscillator is arranged above the table so as to be fixed at a predetermined position on the placing surface, and the laser is driven by driving the table in the X coordinate direction and the Y coordinate direction which are parallel to the placing surface and orthogonal to each other. The spots of the beam are sequentially applied to the four sides of the fitting portion between the lid plate and the rectangular case, and the four sides are temporarily fixed in order, and then the spot of the laser beam is applied to the entire circumference of the fitting portion. A method for welding a closed container of a prismatic battery, which comprises welding the entire fitting portion.
に嵌合される請求項１乃至６のいずれか記載の角形電池
の密閉容器の溶接方法。7. The method for welding a sealed container of a prismatic battery according to claim 1, wherein the lid plate is fitted into the opening of the case by press fitting.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7331899A JPH08315790A (en) | 1995-03-13 | 1995-12-20 | Welding method of sealed vessel of square battery |
| US08/611,401 US5879416A (en) | 1995-03-13 | 1996-03-06 | Method of manufacturing battery having polygonal case |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7-52521 | 1995-03-13 | ||
| JP5252195 | 1995-03-13 | ||
| JP7331899A JPH08315790A (en) | 1995-03-13 | 1995-12-20 | Welding method of sealed vessel of square battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08315790A true JPH08315790A (en) | 1996-11-29 |
Family
ID=26393123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7331899A Pending JPH08315790A (en) | 1995-03-13 | 1995-12-20 | Welding method of sealed vessel of square battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08315790A (en) |
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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1995
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| US6264708B1 (en) | 1997-09-30 | 2001-07-24 | Matsushita Electric Industrial Co., Ltd. | Method of manufacturing a prismatic battery |
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| JP2013157151A (en) * | 2012-01-27 | 2013-08-15 | Komatsu Ntc Ltd | Battery case sealing apparatus and battery case sealing method |
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| JP2014172076A (en) * | 2013-03-11 | 2014-09-22 | Sumitomo Electric Ind Ltd | Method of manufacturing sealed component, and sealed component |
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| CN108127273A (en) * | 2017-12-22 | 2018-06-08 | 华霆（合肥）动力技术有限公司 | Cover board, welding system and welding method |
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