JP3608994B2 - Sealed battery - Google Patents

Sealed battery Download PDF

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Publication number
JP3608994B2
JP3608994B2 JP36711899A JP36711899A JP3608994B2 JP 3608994 B2 JP3608994 B2 JP 3608994B2 JP 36711899 A JP36711899 A JP 36711899A JP 36711899 A JP36711899 A JP 36711899A JP 3608994 B2 JP3608994 B2 JP 3608994B2
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Prior art keywords
battery
lid
sealed
welding
opening
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JP2001185099A (en
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哲博 大角
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Ｎｅｃトーキン栃木株式会社
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

【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。
【０００２】
【従来の技術】
小型の電子機器用の電源として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。
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。
【０００３】
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。
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見いだした。
【０００４】
図４は、電池缶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。
【０００５】
ところが、溶接部位における電池缶１の蓋体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。
【０００６】
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。
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。
【０００７】
【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。
【０００８】
【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嵌合した蓋体を溶接によって封口した密閉型電池において、蓋体は、蓋体の側面の対辺に少なくとも２ヶ所に周方向に連続せず、蓋体を電池缶の開口部に嵌合した後に電池缶の外面から押圧した場合には電池缶の缶壁を係止可能な凹部を有し、蓋体を電池缶の開口部に嵌合した後に電池缶の外面から押圧して缶壁を係止後に、蓋体と電池缶の内壁面との境界部をレーザー溶接によって封口した密閉型電池によって解決することができる。
また、蓋体の側面の凹部は、蓋体表面から見て多角形状、曲面状あるいは三角形状のいずれかであって、蓋体の長辺側の対辺の３ヶ所もしくは４ヶ所に設けた前記の密閉型電池である。
【０００９】
【発明の実施の形態】
本発明の密閉型電池は、電池缶の開口部へ嵌合する蓋体として、蓋体の側面の電池缶の壁面に面する部分に凹部を形成したものを用い、蓋体を電池缶の開口部へ嵌合した後に、電池缶の外面を押圧して凹部に電池缶の壁面を係止した後に、蓋体と電池缶の接触面にレーザーを照射して封口することによって、蓋体の嵌合不良とその後のレーザー溶接によっても溶接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。
【００１０】
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、斜視図である。
本発明の密閉型電池は、電池缶１の上端の開口端部に、対辺上に凹部７を設けた蓋体３を嵌合し、電池缶１の開口端部２を外部から押圧してかしめることによって蓋体３を電池缶１の開口端部２に仮止めした後に、蓋体３と電池缶１の缶壁との境界部１０にレーザーを照射することによって封口したものである。
【００１１】
図２は、本発明の密閉型電池の製造工程を説明する図である。
図２（Ａ）は、電池缶１を上部から見た開口端部２を示す平面図であり、通常の角型状の電池缶と同様に開口端部は、長方形もしくは正方形の形状を有している。
図２（Ｂ）は、本発明の電池缶１の開口端部２に嵌合する蓋体３を説明する平面図である。蓋体３には、導電接続用の電極接続端子５が設けられており、蓋体３の側面の長辺側６の対辺上には凹部７が形成されている。
本発明の密閉型電池は、図２（Ｃ）に示すように、図２（Ａ）で示した電池缶の開口部へ、図２（Ｂ）で示した蓋体を電池缶の開口部へ嵌合した後に、電池缶１の対向する長辺の両側から蓋体の凹部７の外側から凸部８を設けたかしめ治具９によって電池缶１をかしめることによって、蓋体の両側面に設けた凹部に電池缶の内壁面を係止して電池缶の開口端部に蓋体３を仮止めする。
この後、図２（Ｄ）に示すように、蓋体と電池缶の内壁との境界部１０に沿ってレーザー４を照射して電池缶と蓋体を溶融しレーザー溶接によって封口するものである。
【００１２】
以上のように、本発明の密閉型電池においては、長辺側の対辺に予め凹部を形成した蓋体を電池缶の開口部に嵌合した後に、電池缶の外部から蓋体の凹部に向けてかしめて電池缶の内壁面を蓋体の凹部に係合することによって蓋体を確実に仮固定し、その後レーザー照射によって封口するので、蓋体が熱によって変形して嵌合不良が生じることはなく、蓋体の外周部と電池缶の内壁面との境界部の間隙を所定の大きさに保持した状態で蓋体と電池缶の缶壁とを溶融させて溶接することができる。
【００１３】
図３は、蓋体に設ける凹部を説明する図である。
図３（Ａ）に示すように、蓋体３の長辺側６の対辺に３個の凹部７を設けたものであり、一方の辺に設けた複数の凹部は、その相互の間隔Ｗは、長辺の長さの半分以上の大きさとすることが好ましく、それによって嵌合した蓋体をかしめて仮止めする際にはより安定した固着が可能となる。
また、凹部７は、多角形状、曲面状等の形状とすることができるが、三角形状とすることによって係止効果を大きくすることができる。
また、凹部７の深さｈは、長辺が３４ｍｍ、短辺が７ｍｍ程度の小型の電池の蓋の場合には、０．１ｍｍ程度の大きさとすることが好ましい。
【００１４】
また、図３（Ｂ）は、蓋体の他の例を説明する図である。蓋体３の長辺側６の対辺に４個の凹部７を設けたものであり、それぞれの辺に設けた凹部相互の間隔は、図３（Ａ）に示したものと同様に長辺の長さの半分以上の大きさとすることが好ましい。
【００１５】
【実施例】
以下に実施例を示し本発明を説明する。
実施例１
板厚０．４ｍｍのニッケルめっき軟鋼板を用いた、高さ４８ｍｍ、幅３４ｍｍ、厚さ８ｍｍの電池缶に、リチウムマンガン酸複合酸化物を塗布した正極と炭素質材料を塗布した負極とをセパレータを介して積層した後に、巻回した電池要素を収納した。
電極取出端子を中央に設けた、長辺の幅３３．２ｍｍ、短辺の幅７．２ｍｍ、板厚０．５ｍｍの蓋体の一方の長辺側の中央部に深さ０．１ｍｍの三角形状の凹部を形成し、対辺には中央部からの距離が等しく相互の間隔が２０ｍｍの凹部を形成した。
蓋体を電池缶の開口部に嵌合した後に、凹部に相当する位置に突起を有するかしめ治具によって、電池缶の外部から蓋体の凹部に相当する位置を３．９２ＭＰａ（４０ｋｇ／ｃｍ２）以上の圧力で押圧してかしめた。
蓋体に凹部を設けてかしめることによって、電池缶と蓋体との境界部で形成される間隔を一定に保持することができるので、蓋体と電池缶との境界部にレーザーを照射した場合には、信頼性が大きな封口を形成することができる。
【００１６】
本発明の方法によって製造した電池と、蓋体に凹部を形成していない電池について、電解液漏液検査を行ったところ、蓋体に凹部を形成していない電池では、１０００個の電池について、１〜５個の不良品が発生していたが、本発明の蓋体に凹部を形成した電池では不良品は発生しなかった。
【００１７】
【発明の効果】
本発明は、電池缶の開口部に嵌合する蓋体の対辺の側面に少なくとも２ヶ所に凹部を設け、電池缶を凹部上から押圧してかしめることによって蓋体を電池缶の開口部に仮止めすることによって、蓋体と電池缶との境界部における間隙を一定の大きさに保持することができるので、境界部のレーザー溶接による封口工程においても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。
【図面の簡単な説明】
【図１】図１は、本発明の密閉型電池を説明する図である。
【図２】図２は、本発明の密閉型電池の製造工程を説明する図である。
【図３】図３は、蓋体に設ける凹部を説明する図である。
【図４】図４は、電池缶の封口方法を説明する図である。
【符号の説明】
１…電池缶、２…開口端部、３…蓋体、４…レーザー、５…電極接続端子、６…長辺側、７…凹部、８…凸部、９…かしめ治具、１０…境界部[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery in which a lid is fitted to an opening of a battery can and sealed by welding, and particularly when a lid is fitted and welded to a fitting part of a square battery, sealing failure or the like may occur. Not related to sealed batteries.
[0002]
[Prior art]
Batteries are used as power sources for small electronic devices. In particular, non-aqueous electrolyte batteries such as lithium ion secondary batteries, which are small-sized and large-capacity sealed batteries, are used as power sources for mobile phones, notebook computers, camera-integrated video recorders, and the like.
In battery-operated equipment, a rectangular parallelepiped battery storage is generally used. In such a battery housing portion of a rectangular parallelepiped device, there is a problem that an invalid volume increases in a cylindrical battery. Further, since the diameter of the cylindrical battery is limited by the thickness of the battery storage portion, a thin prismatic sealed battery is used instead of the cylindrical battery in a small or thin device. ing.
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 that houses a power generation element.
[0003]
In the process of assembling a rectangular sealed battery, the welding method of the lid is laser welding, which has a higher positioning accuracy of the weld and less thermal influence around the weld compared to arc welding, resistance welding, and gas welding. The method by is widely used.
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 square 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 part or insufficient pressure resistance of the welded part may be found.
The present inventors have found such a sealing failure based on the following causes from the disassembly and cross-sectional observation of a defective welding product.
[0004]
FIG. 4 is a diagram illustrating a method for sealing a battery can.
4A is a perspective view showing the appearance of the battery can, and FIGS. 4B and 4C are cross-sectional views taken along line AA ′ in FIG. 4A. FIG. 5 is a diagram in which a power generation element inside the battery is omitted.
A state in which the lid 3 is inserted into the opening end 2 at the upper end of the battery can 1 and the outer peripheral edge of the lid 3 is butted against the inner periphery of the opening end 2 of the battery can 1 as shown in FIG. Laser welding is performed by irradiating a predetermined portion of the fitting portion with the laser 4 while keeping it.
[0005]
However, when the lid locking property of the battery can 1 at the welded portion is lowered, as shown in FIG. 4 (C), the lid 3 falls into the inside of the battery can 1 at the welded portion, or the welded portion due to the reaction thereof. Since the lid 3 is lifted to the outside of the battery can 1 on the opposite side and the lid 3 is obliquely displaced, the focal length of the laser 4 to the contact portion between the lid 3 and the battery can becomes not constant. In the part where the focus does not match, sufficient energy is not given. Further, it has been found that in the lifted portion, the lifted lid body may cause a shadow of the laser irradiation portion and cause poor welding. In addition, it is conceivable to manually rework what is not accurately fitted with a lid, but it is practically impossible to manually rework when mass production is performed in an automated process.
[0006]
In addition, in order to ensure the close contact between the battery can and the lid by laser welding, the fitting part of the rectangular battery can is temporarily fixed at three or more temporary fixing points that are separated from each other. JP-A-8-315790 proposes laser welding the entire circumference of the joint.
Japanese Patent Application Laid-Open No. 9-288999 also discloses that a lid is welded and sealed by laser welding after being temporarily fixed by laser welding or spot welding.
However, in the temporary fixing by welding such as laser welding, a part of the lid body jumps up due to thermal deformation of the lid body, the gap of the fitting portion increases, or the parallelism deteriorates. As a result, laser welding In some cases, a poorly sealed part occurred.
[0007]
[Problems to be solved by the invention]
The present invention provides a sealed battery that can be sealed without causing positional deviation of the lid when the lid of the sealed battery is welded and sealed by laser welding or the like. It is an object to do.
[0008]
[Means for Solving the Problems]
An object of the present invention is to provide a sealed battery in which a lid fitted into an upper opening of a battery can is sealed by welding, and the lid does not continue in the circumferential direction at least at two opposite sides of the side of the lid. When the lid is pressed from the outer surface of the battery can after the lid is fitted to the opening of the battery can, it has a recess that can lock the can wall of the battery can, and the lid is fitted to the opening of the battery can Then, after sealing the can wall by pressing from the outer surface of the battery can, it can be solved by a sealed battery in which the boundary between the lid and the inner wall surface of the battery can is sealed by laser welding.
Further, the concave portion on the side surface of the lid body is any one of a polygonal shape, a curved surface shape, or a triangular shape as viewed from the lid body surface, and is provided at the three or four locations on the opposite side of the long side of the lid body. It is a sealed battery.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The sealed battery of the present invention uses, as a lid that fits into the opening of the battery can, a recess formed in a portion facing the wall surface of the battery can on the side of the lid, and the lid is the opening of the battery can. After fitting to the part, the outer surface of the battery can is pressed to lock the wall surface of the battery can in the recess, and then the contact surface of the lid and the battery can is irradiated with a laser to seal the lid. It has been found that a sealed battery can be obtained in which poor welding and subsequent laser welding do not cause poor welding.
[0010]
The sealed battery of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view illustrating a sealed battery of the present invention.
In the sealed battery of the present invention, the lid 3 having the recess 7 on the opposite side is fitted to the opening end of the upper end of the battery can 1 and the opening end 2 of the battery can 1 is pressed from the outside. The lid 3 is temporarily fixed to the opening end 2 of the battery can 1 by crimping, and then sealed by irradiating the boundary portion 10 between the lid 3 and the can wall of the battery can 1 with a laser.
[0011]
FIG. 2 is a diagram for explaining the manufacturing process of the sealed battery of the present invention.
FIG. 2 (A) is a plan view showing the open end 2 when the battery can 1 is viewed from above, and the open end has a rectangular or square shape like a normal square battery can. ing.
FIG. 2 (B) is a plan view for explaining the lid 3 fitted to the open end 2 of the battery can 1 of the present invention. The lid 3 is provided with electrode connection terminals 5 for conductive connection, and a recess 7 is formed on the opposite side of the long side 6 of the side surface of the lid 3.
As shown in FIG. 2 (C), the sealed battery of the present invention is connected to the opening of the battery can shown in FIG. 2 (A), and the lid shown in FIG. 2 (B) to the opening of the battery can. After the fitting, the battery can 1 is caulked by a caulking jig 9 provided with a convex portion 8 from the outside of the concave portion 7 of the lid body from both sides of the long side of the battery can 1 facing each other. The inner wall surface of the battery can is locked in the provided recess, and the lid 3 is temporarily fixed to the opening end of the battery can.
Thereafter, as shown in FIG. 2 (D), the laser can 4 is irradiated along the boundary 10 between the lid and the inner wall of the battery can to melt the battery can and the lid and seal them by laser welding. .
[0012]
As described above, in the sealed battery according to the present invention, after fitting a lid in which a recess is formed in advance on the opposite side of the long side into the opening of the battery can, it is directed from the outside of the battery can to the recess of the lid. The lid is securely fixed temporarily by engaging the inner wall surface of the battery can with the concave portion of the lid, and then sealed by laser irradiation, so that the lid is deformed by heat, resulting in poor fitting. Rather, the lid and the can wall of the battery can can be melted and welded while the gap at the boundary between the outer peripheral portion of the lid and the inner wall surface of the battery can is maintained at a predetermined size.
[0013]
FIG. 3 is a diagram illustrating a recess provided in the lid.
As shown in FIG. 3 (A), three recesses 7 are provided on the opposite side of the long side 6 of the lid 3, and a plurality of recesses provided on one side have a mutual interval W of It is preferable that the size of the long side is not less than half of the length of the long side, so that more stable fixing can be achieved when the fitted lid body is caulked and temporarily fixed.
Moreover, although the recessed part 7 can be made into shapes, such as polygonal shape and curved surface shape, the latching effect can be enlarged by making it into a triangular shape.
In addition, the depth h of the recess 7 is preferably about 0.1 mm in the case of a small battery lid having a long side of 34 mm and a short side of about 7 mm.
[0014]
FIG. 3B illustrates another example of the lid. Four concave portions 7 are provided on the opposite side of the long side 6 of the lid 3, and the interval between the concave portions provided on the respective sides is the same as that shown in FIG. The size is preferably half or more of the length.
[0015]
【Example】
The following examples illustrate the invention.
Example 1
Using a nickel-plated mild steel plate with a thickness of 0.4 mm, a battery can with a height of 48 mm, a width of 34 mm, and a thickness of 8 mm is separated into a positive electrode coated with lithium manganate composite oxide and a negative electrode coated with a carbonaceous material. After being laminated through, the wound battery element was stored.
A triangle with a depth of 0.1 mm at the center of one long side of a lid with a long side width of 33.2 mm, a short side width of 7.2 mm, and a plate thickness of 0.5 mm, provided with an electrode lead-out terminal in the center. A concave portion having a shape was formed, and concave portions having an equal distance from the central portion and a distance of 20 mm were formed on the opposite side.
After the lid is fitted into the opening of the battery can, the position corresponding to the recess of the lid is set to 3.92 MPa (40 kg / cm 2 ) from the outside of the battery can by a caulking jig having a protrusion at the position corresponding to the recess. ) Press and crimp with the above pressure.
Since the gap formed in the boundary between the battery can and the lid can be kept constant by caulking the lid by providing a recess, the laser is irradiated to the boundary between the lid and the battery can In some cases, a highly reliable seal can be formed.
[0016]
When a battery manufactured by the method of the present invention and a battery that does not have a recess in the lid were subjected to an electrolyte leakage test, a battery that did not have a recess in the lid had 1000 batteries. Although 1 to 5 defective products were generated, no defective product was generated in the battery in which the concave portion was formed in the lid of the present invention.
[0017]
【The invention's effect】
The present invention provides at least two concave portions on the opposite side surface of the lid that fits into the opening of the battery can, and presses and crimps the battery can from the top of the lid to the opening of the battery can. By temporarily fixing, the gap at the boundary between the lid and the battery can can be maintained at a constant size, so laser welding caused by poor mounting of the lid in the sealing process by laser welding at the boundary. Defects can be prevented.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a sealed battery according to the present invention.
FIG. 2 is a diagram for explaining a manufacturing process for a sealed battery according to the present invention.
FIG. 3 is a diagram illustrating a recess provided in the lid.
FIG. 4 is a diagram illustrating a method for sealing a battery can.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Battery can, 2 ... Open end part, 3 ... Cover body, 4 ... Laser, 5 ... Electrode connection terminal, 6 ... Long side, 7 ... Concave part, 8 ... Convex part, 9 ... Caulking jig, 10 ... Boundary Part

Claims (2)

電池缶の上部の開口部に嵌合した蓋体を溶接によって封口した密閉型電池において、蓋体は、蓋体の側面の対辺に少なくとも２ヶ所に周方向に連続せず、蓋体を電池缶の開口部に嵌合した後に電池缶の外面から押圧した場合には電池缶の缶壁を係止可能な凹部を有し、蓋体を電池缶の開口部に嵌合した後に電池缶の外面から押圧して缶壁を係止後に、蓋体と電池缶の内壁面との境界部をレーザー溶接によっ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 fitted in an opening at the top of a battery can is sealed by welding, the lid is not continuous in the circumferential direction at least at two opposite sides of the side of the lid, and the lid is battery can When the battery can is pressed from the outer surface after being fitted into the opening of the battery can, the battery can has a recess capable of locking the can wall, and the outer surface of the battery can after the lid is fitted into the opening of the battery can After sealing the can wall by pressing, the boundary between the lid and the inner wall surface of the battery can is sealed by laser welding. 蓋体の側面の凹部は、蓋体表面から見て多角形状、曲面状あるいは三角形状のいずれかであって、蓋体の長辺側の対辺の３ヶ所もしくは４ヶ所に設けたものであることを特徴とする密閉型電池。The recesses on the side surface of the lid are polygonal, curved or triangular as viewed from the lid surface, and are provided at three or four locations on the opposite side of the long side of the lid. A sealed battery characterized by.
JP36711899A 1999-12-24 1999-12-24 Sealed battery Expired - Lifetime JP3608994B2 (en)

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CN104526162B (en) * 2014-11-24 2016-09-28 中国电子科技集团公司第二十九研究所 In a kind of Laser seal welding, large cover is from spacing method
CN104551420A (en) * 2014-12-25 2015-04-29 宁德新能源科技有限公司 Battery positioning and clamping device

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