JP2001167740A - Sealed battery - Google Patents
Sealed batteryInfo
- Publication number
- JP2001167740A JP2001167740A JP34725399A JP34725399A JP2001167740A JP 2001167740 A JP2001167740 A JP 2001167740A JP 34725399 A JP34725399 A JP 34725399A JP 34725399 A JP34725399 A JP 34725399A JP 2001167740 A JP2001167740 A JP 2001167740A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- lid
- sealed
- welding
- laser
- 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.)
- Granted
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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電池缶の開口部に
蓋を嵌合して溶接によって封口した電池に関し、特に角
型電池の嵌合部に蓋体を嵌合して溶接する際に封口不良
等が生じることがない密閉型電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery which has a lid fitted into an opening of a battery can and sealed by welding. The present invention relates to a sealed battery that does not cause poor sealing or the like.
【０００２】[0002]
【従来の技術】小型の電子機器用の電源として各種の電
池が用いられている。とくに携帯電話、ノート型パソコ
ン、カメラ一体型ビデオレコーダ等の電源としては、小
型で大容量の密閉型電池であるリチウムイオン二次電池
等の非水電解液電池が用いられている。電池使用機器に
おいては、一般には直方体状の電池収納部が用いられて
いる。このような直方体状の形状の機器の電池収納部に
おいては、円筒形状の電池では無効な容積が大きくなる
という問題があった。さらに、電池収納部の厚さによっ
て円筒型の電池の径が制限を受けるので、小型、あるい
は薄型の機器においては、円筒型の電池に代えて、厚み
の薄い角柱状の密閉型電池が用いられている。2. Description of the Related Art Various batteries are used as power supplies for small electronic devices. In particular, non-aqueous electrolyte batteries such as lithium-ion secondary batteries, which are small and large-capacity sealed batteries, are used as power sources for mobile phones, notebook computers, camera-integrated video recorders, and the like. In battery-powered equipment, a rectangular parallelepiped battery housing is generally used. In the battery storage section of the device having such a rectangular parallelepiped shape, there is a problem that an invalid volume is increased with a cylindrical battery. Furthermore, since the diameter of the cylindrical battery is limited by the thickness of the battery housing, in a small or thin device, a thin prismatic sealed battery is used instead of the cylindrical battery. ing.
【０００３】これらの角型の密閉型電池は、発電要素を
収納したステンレス、ニッケルメッキ鋼板、アルミニウ
ム等からなる電池缶の開口端部に電池蓋を溶接すること
によって製造されている。角型の密閉型電池の組立工程
では、蓋体の溶接方法としてはアーク溶接、抵抗溶接、
ガス溶接に比べて、溶接部の位置決め精度が高く溶接部
周囲への熱的影響が少ない、レーザー溶接による方法が
ひろく用いられている。[0003] These rectangular sealed batteries are manufactured by welding a battery lid to an open end of a battery can made of stainless steel, nickel-plated steel plate, aluminum or the like containing a power generating element. In the process of assembling the prismatic sealed battery, arc welding, resistance welding,
Compared to gas welding, laser welding is widely used, which has higher positioning accuracy of the welded portion and less thermal influence on the periphery of the welded portion.
【０００４】レーザー溶接を用いた封口方法では、角型
の金属缶の一端に形成された開口部に金属板から形成さ
れた蓋体を嵌入し、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。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
見いだした。In the sealing method using laser welding, a lid formed of a metal plate is fitted into an opening formed at one end of a rectangular metal can, and the fitting portion is laser-welded. However, in the inspection of the sealed container after welding, leakage of the electrolyte from the welded portion and insufficient pressure resistance of the welded portion were sometimes found. The present inventors have found that such poor sealing is based on the following causes from decomposition of the defective welding product and cross-sectional observation.
【０００５】図４は、従来の電池缶の開口部の封口方法
を説明する図である。図４（Ａ）は、電池缶の外観を示
す斜視図であり、図４（Ｂ）および図４（Ｃ）は、図４
（Ａ）において、Ａ−Ａ’線で切断した断面図であり、
電池内部の発電要素を省略した図である。電池缶１の上
端の開口端部２に蓋体３を嵌入し、図４（Ｂ）に示すよ
うに蓋体３の外周縁を電池缶１の開口端部２の内周に突
き合わせた状態を保ちつつ嵌合部の所定部位にレーザー
４を照射してレーザー溶接する。FIG. 4 is a view for explaining a conventional method for sealing the opening of a battery can. FIG. 4A is a perspective view showing the appearance of the battery can, and FIGS. 4B and 4C are diagrams of FIG.
FIG. 3A is a cross-sectional view taken along line AA ′ in FIG.
It is the figure which omitted the power generation element inside a battery. The lid 3 is fitted into the open end 2 of the upper end of the battery can 1, and a state in which the outer peripheral edge of the lid 3 is butted against the inner periphery of the open end 2 of the battery can 1 as shown in FIG. The laser 4 is irradiated to a predetermined portion of the fitting portion while maintaining the same, and laser welding is performed.
【０００６】ところが、溶接部位における電池缶１の蓋
体の係止性が低下すると、図４（Ｃ）に示すように、溶
接部位において蓋体３が電池缶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
体３が電池缶１の外側へ持ち上げられたりして蓋体３が
斜めにずれるために、蓋体３と電池缶との接触部へのレ
ーザー４の焦点距離が一定しなくなり、焦点が合致しな
い部分では十分にエネルギーが与えられなくなる。ま
た、持ち上げられた部分では、持ち上げられた蓋体によ
って、レーザーの照射部の影が生じ溶接不良が生じる場
合があることが判明した。また、蓋体が正確に装着され
ていないものについて人手で手直しをすることも考えら
れるが、自動化工程において大量生産を行う場合には人
手で手直しを行うことは事実上不可能である。However, when the locking of the lid of the battery can 1 at the welding site is reduced, as shown in FIG. Because the lid 3 is lifted to the outside of the battery can 1 on the opposite side of the welding portion due to the recoil and the lid 3 is displaced obliquely, the focal length of the laser 4 to the contact portion between the lid 3 and the battery can Becomes inconsistent, and energy is not sufficiently provided in a portion where the focus does not match. In addition, it has been found that in the lifted portion, the shadow of the laser irradiation part may be caused by the lifted lid, and welding failure may occur. In addition, it is conceivable to manually retouch a lid that is not correctly attached. However, when mass production is performed in an automation process, it is practically impossible to manually retouch the lid.
【０００７】また、レーザー溶接によって電池缶と蓋体
との密着をより確実なものとするために、角型の電池缶
の嵌合部の互いに離れた３カ所以上の仮止め箇所を仮止
めした後に、嵌合部の全周をレーザー溶接することが特
開平８−３１５７９０号公報において提案されている。
また、特開平９−２８８９９９号公報にも、レーザー溶
接、スポット溶接によって仮止めした後に、レーザー溶
接によって蓋体を溶接して密閉することが記載されてい
る。Further, in order to further secure the close contact between the battery can and the lid by laser welding, three or more temporarily fixed portions of the fitting portion of the rectangular battery can are temporarily fixed. Later, it is proposed in Japanese Patent Application Laid-Open No. 8-315790 that the entire periphery of the fitting portion is laser-welded.
Also, Japanese Patent Application Laid-Open No. 9-288999 describes that a lid is temporarily sealed by laser welding and spot welding, and then a lid is welded and sealed by laser welding.
【０００８】ところが、レーザー溶接等の溶接による仮
止めでは蓋体の熱的な変形等から蓋体の一部が跳ね上が
り、嵌合部の間隙が増加したり、あるいは平行度が悪化
し、その結果、レーザー溶接の密閉不良個所が生じるこ
とがあった。However, in the case of temporary fixing by welding such as laser welding, a part of the lid jumps up due to thermal deformation of the lid or the like, thereby increasing the gap of the fitting portion or deteriorating the parallelism. In some cases, poor sealing of laser welding occurred.
【０００９】[0009]
【発明が解決しようとする課題】本発明は、レーザー溶
接等によって密閉型電池の蓋体を溶接して封口する際
に、蓋体の位置ずれ等を生じることなく溶接することが
でき、確実な溶接によって封口が可能な密閉型電池を提
供することを課題とするものである。SUMMARY OF THE INVENTION According to the present invention, when a lid of a sealed battery is welded and sealed by laser welding or the like, the lid can be welded without causing displacement and the like, and a reliable battery can be obtained. It is an object of the present invention to provide a sealed battery that can be sealed by welding.
【００１０】[0010]
【課題を解決するための手段】本発明の課題は、電池缶
の上部の開口部に蓋体を溶接によって封口した密閉型電
池において、電池缶の開口端部の長辺側、短辺側の少な
くともいずれか一方は、蓋体を開口端部に嵌合した際
に、その先端部が蓋体の上部を超えて延びた部分を有
し、蓋体の上部を超えた部分を内方へ折り曲げた後に溶
接して封口したものである密閉型電池によって解決され
る。また、電池缶の開口端部において蓋体を受ける段差
部を形成したものである前記の密閉型電池である。SUMMARY OF THE INVENTION It is an object of the present invention to provide a sealed battery in which a lid is sealed to the upper opening of the battery can by welding, the long side and the short side of the open end of the battery can. When at least one of the lids is fitted to the opening end, the tip has a portion extending beyond the top of the lid, and the portion beyond the top of the lid is bent inward. The problem is solved by a sealed battery which is sealed after welding. Further, the above-mentioned sealed battery is one in which a step portion for receiving a lid is formed at an opening end of the battery can.
【００１１】[0011]
【発明の実施の形態】本発明の密閉型電池は、電池缶の
開口部端部の長辺側、短辺側の少なくともいずれか一方
には、開口部に蓋体を嵌合した後に、蓋体の上部に延び
た開口端部を内側へ折り曲げて蓋体を固定した後にレー
ザー溶接を行うので、電池缶の開口部に嵌合した蓋体の
位置ずれがなく、レーザー溶接によっても封口不良が生
じることがない密閉型電池が得られることを見出したも
のであります。BEST MODE FOR CARRYING OUT THE INVENTION In a sealed battery according to the present invention, at least one of a long side and a short side of an end of an opening of a battery can is fitted with a cover in the opening. Laser welding is performed after bending the opening end extending to the upper part of the body inward and fixing the lid, so there is no displacement of the lid fitted to the opening of the battery can, and there is no sealing failure even by laser welding. It has been found that sealed batteries that do not occur can be obtained.
【００１２】本発明の密閉型電池を図面を参照して説明
する。図１は、本発明の密閉型電池を説明する図であ
り、図１（Ａ）は電池缶の上部の斜視図であり、図１
（Ｂ）は、Ｂ−Ｂ’線の断面を説明する図である。本発
明の電池缶１の開口端部２に蓋体３を嵌合させた際に、
長辺側上端部５を蓋体３の上面を超えて位置するように
するとともに、長辺側上端部５を折り曲げてかしめたも
のであり、蓋体を短辺側上端部６に載置したものであ
る。そして、上面から電池缶の長辺側上端部５を中心方
向へ折り曲げてかしめた部分に上面からレーザー４を照
射してレーザー溶接するとともに、電池缶の短辺側上端
部６の蓋体３の載置面を側面からレーザー４を照射し溶
接して封口することができる。A sealed battery according to the present invention will be described with reference to the drawings. FIG. 1 is a view for explaining a sealed battery of the present invention, and FIG. 1 (A) is a perspective view of an upper portion of a battery can.
(B) is a figure explaining the section of the BB 'line. When the lid 3 is fitted to the opening end 2 of the battery can 1 of the present invention,
The upper end 5 of the long side is located beyond the upper surface of the lid 3, and the upper end 5 of the long side is bent and caulked, and the lid is placed on the upper end 6 of the short side. Things. The upper end 5 of the long side of the battery can is bent from the upper side toward the center and caulked, and the laser 4 is irradiated from the upper side to perform laser welding, and the lid 3 of the upper end 6 on the short side of the battery can is welded. The mounting surface can be sealed by irradiating the laser 4 from the side and welding.
【００１３】また、蓋体を超えて延びる部分の大きさ
は、レーザーのビード幅の半分程度とすることが好まし
く、小型の電池缶の場合には、レーザーのビード幅が
０．６〜１．０ｍｍとなるようにレーザーを照射するの
で、蓋体を超えて延びる長さは０．３〜０．５ｍｍとす
ることができる。The size of the portion extending beyond the lid is preferably about half the bead width of the laser. In the case of a small battery can, the bead width of the laser is 0.6 to 1. Since the laser is irradiated so as to be 0 mm, the length extending beyond the lid can be 0.3 to 0.5 mm.
【００１４】図２は、本発明の密閉型電池を他の例を説
明する図であり、図２（Ａ）は電池缶の上部の斜視図で
あり、図２（Ｂ）は、Ｃ−Ｃ’線の断面を説明する図で
ある。図２に示した本発明の電池缶１の開口端部２に蓋
体３を嵌合させた際に、蓋体の上面と短辺側上端部６の
上面を同じ位置に位置させるとともに、長辺側上端部５
を蓋体３の上面を超えて位置させて、長辺側上端部５を
中心方向へ折り曲げてかしめたものであり、上面から蓋
体の外周部にレーザー４を照射して溶接し封口したもの
である。FIG. 2 is a view for explaining another example of the sealed battery of the present invention. FIG. 2 (A) is a perspective view of the upper part of a battery can, and FIG. It is a figure explaining the cross section of the line. When the lid 3 is fitted to the open end 2 of the battery can 1 of the present invention shown in FIG. 2, the upper surface of the lid and the upper surface of the short side upper end 6 are positioned at the same position, Side upper end 5
Is positioned over the upper surface of the lid 3 and the upper end 5 on the long side is bent toward the center and swaged, and the outer periphery of the lid is irradiated with the laser 4 from the upper surface and welded and sealed. It is.
【００１５】図３は、本発明の密閉型電池を他の例を説
明する図であり、図３（Ａ）は電池缶の上部の斜視図で
あり、図３（Ｂ）は、Ｄ−Ｄ’線の断面を説明する図で
ある。図３に示した本発明の電池缶１の開口端部２に
は、段差部７を設けて蓋体３を嵌合させたものである。
段差部７は、蓋体３の上面が短辺側上端部６の面と一致
するような大きさとする。蓋体の上部へ延びた長辺側上
端部を中心方向へ折り曲げた後に、蓋体の周囲に上面か
らレーザー４を照射しレーザー溶接によって封口したも
のである。開口部に段差部７を設けたので、蓋体３は電
池缶に蓋体３を嵌合させる際に蓋体が電池缶の内部に落
下するおそれはなく、段差部７において保持されるため
に蓋体の装着が容易となる。FIG. 3 is a view for explaining another example of the sealed battery of the present invention. FIG. 3 (A) is a perspective view of the upper part of a battery can, and FIG. It is a figure explaining the cross section of the line. A stepped portion 7 is provided at the open end 2 of the battery can 1 of the present invention shown in FIG.
The step 7 has a size such that the upper surface of the lid 3 coincides with the surface of the upper end 6 on the short side. After bending the upper end of the long side extending to the upper part of the lid toward the center, the periphery of the lid is irradiated with a laser 4 from above and sealed by laser welding. Since the step 7 is provided in the opening, the cover 3 does not fall into the battery can when the cover 3 is fitted to the battery can. Mounting of the lid becomes easy.
【００１６】以上のように、本発明の密閉型電池におい
ては、蓋体が電池缶の開口端部の所定の位置に確実に嵌
合して仮固定した後に、レーザーを照射してレーザー溶
接するので、レーザー溶接の際の熱によって変形するこ
とはなく、確実な封口が可能となり、本発明の密閉型電
池は、小型のリチウムイオン電池等に好適である。As described above, in the sealed battery of the present invention, after the lid is securely fitted and temporarily fixed to the predetermined position of the opening end of the battery can, laser irradiation is performed and laser welding is performed. Therefore, the battery is not deformed by heat at the time of laser welding and can be securely sealed. The sealed battery of the present invention is suitable for a small lithium ion battery or the like.
【００１７】[0017]
【発明の効果】本発明は、電池缶の開口端部の長辺側上
端部を、蓋体を嵌合した後に開口端部を中心部へかしめ
るように折り曲げたので、蓋体と電池缶の内面との間に
間隙が生じたり、開口端部との間の係合が確実なものと
なり、その後のによる封口工程において蓋体の装着不良
に起因するレーザー溶接不良を防止することができる。According to the present invention, the upper end of the long side of the open end of the battery can is bent so that the open end is crimped to the center after the cover is fitted. A gap is formed between the inner surface and the inner surface, and the engagement with the opening end portion is ensured, so that a laser welding defect due to a defective mounting of the lid in a subsequent sealing step can be prevented.
【図１】図１は、本発明の密閉型電池を説明する図であ
る。FIG. 1 is a diagram illustrating a sealed battery according to the present invention.
【図２】図２は、本発明の密閉型電池の他の例を説明す
る図である。FIG. 2 is a diagram illustrating another example of the sealed battery of the present invention.
【図３】図３は、本発明の密閉型電池の他の例を説明す
る図である。FIG. 3 is a diagram illustrating another example of the sealed battery of the present invention.
【図４】図４は、従来の密閉型電池を説明する図であ
る。FIG. 4 is a diagram illustrating a conventional sealed battery.
１…電池缶、２…開口端部、３…蓋体、４…レーザー、
５…長辺側上端部、６…短辺側上端部、７…段差部DESCRIPTION OF SYMBOLS 1 ... Battery can, 2 ... Open end part, 3 ... Lid, 4 ... Laser,
5: Upper end of long side, 6: Upper end of short side, 7: Step
Claims (2)
って封口した密閉型電池において、電池缶の開口端部の
長辺側、短辺側の少なくともいずれか一方は、蓋体を開
口端部に嵌合した際に、その先端部が蓋体の上部を超え
て延びた部分を有し、蓋体の上部を超えた部分を内方へ
折り曲げた後に溶接して封口したものであることを特徴
とする密閉型電池。In a sealed battery in which a lid is sealed by welding to an upper opening of a battery can, at least one of a long side and a short side of an opening end of the battery can is opened with a lid. When fitted to the end, the tip has a portion extending beyond the top of the lid, and the portion beyond the top of the lid is bent inward and then sealed by welding. A sealed battery comprising:
を形成したものであることを特徴とする請求項１記載の
密閉型電池。2. The sealed battery according to claim 1, wherein a stepped portion for receiving the lid is formed at an open end of the battery can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34725399A JP3573411B2 (en) | 1999-12-07 | 1999-12-07 | Square sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34725399A JP3573411B2 (en) | 1999-12-07 | 1999-12-07 | Square sealed battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001167740A true JP2001167740A (en) | 2001-06-22 |
| JP3573411B2 JP3573411B2 (en) | 2004-10-06 |
Family
ID=18388970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34725399A Expired - Lifetime JP3573411B2 (en) | 1999-12-07 | 1999-12-07 | Square sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3573411B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007235086A (en) * | 2006-01-31 | 2007-09-13 | Sanyo Electric Co Ltd | Electric double layer capacitor |
| WO2012147782A1 (en) * | 2011-04-28 | 2012-11-01 | 三洋電機株式会社 | Hermetic battery and method for manufacturing same |
| JP2013026175A (en) * | 2011-07-26 | 2013-02-04 | Sanshu Industry Co Ltd | Joint method for lid of battery case |
-
1999
- 1999-12-07 JP JP34725399A patent/JP3573411B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007235086A (en) * | 2006-01-31 | 2007-09-13 | Sanyo Electric Co Ltd | Electric double layer capacitor |
| WO2012147782A1 (en) * | 2011-04-28 | 2012-11-01 | 三洋電機株式会社 | Hermetic battery and method for manufacturing same |
| JP2013026175A (en) * | 2011-07-26 | 2013-02-04 | Sanshu Industry Co Ltd | Joint method for lid of battery case |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3573411B2 (en) | 2004-10-06 |
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