JP2001155698A - Encapsulated type battery - Google Patents
Encapsulated type batteryInfo
- Publication number
- JP2001155698A JP2001155698A JP33731099A JP33731099A JP2001155698A JP 2001155698 A JP2001155698 A JP 2001155698A JP 33731099 A JP33731099 A JP 33731099A JP 33731099 A JP33731099 A JP 33731099A JP 2001155698 A JP2001155698 A JP 2001155698A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- laser
- lid
- opening
- sealing
- 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
【０００１】[0001]
【発明の属する技術分野】本発明は、密閉型電池に関
し、とくに封口部にレーザー溶接によって電池缶に蓋体
を溶接する際に、封口をすると同時に電池の内部圧力の
増大によって破壊される低強度部を形成した密閉型電池
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery, and more particularly to a low-strength battery which is broken when a lid is welded to a battery can by laser welding at the sealing portion and the internal pressure of the battery is increased at the same time. The present invention relates to a sealed battery having a portion.
【０００２】[0002]
【従来の技術】密閉型電池においては、各種の方法によ
って電池缶と蓋体との間を封口している。電池使用機器
の電池収納部の空間を有効に使用することができる電池
として、角型電池が用いられており、角型電池では、金
属製の角型の電池缶の開口部に蓋体を嵌合させた後に蓋
体と電池缶の開口部の壁面で形成される封口部を溶接す
ることによって封口を行っている。このような電池の封
口は、レーザーを用いたレーザー溶接が広く用いられて
いる。レーザー溶接は、他の溶接方法に比べて局部的な
加熱が可能であり、電池の電極取り出し端子部の絶縁材
料として用いられている合成樹脂、あるいは電池缶内部
の電池要素等に影響が少ないという特徴を有している。
レーザー溶接は、レーザー照射手段、あるいは電池を載
置したテーブルを所定の経路で移動して行っている。2. Description of the Related Art In a sealed battery, a gap between a battery can and a lid is sealed by various methods. A prismatic battery is used as a battery that can effectively use the space of a battery storage unit of a battery-powered device. In the case of a prismatic battery, a lid is fitted into an opening of a metal prismatic battery can. After joining, the lid is sealed by welding a sealing portion formed by the wall surface of the opening of the battery can. For such battery sealing, laser welding using a laser is widely used. Laser welding is capable of local heating compared to other welding methods, and has little effect on the synthetic resin used as an insulating material for the battery electrode extraction terminal, or on battery elements inside the battery can. Has features.
Laser welding is performed by moving a laser irradiation means or a table on which a battery is placed along a predetermined path.
【０００３】図４は、従来のレーザーによる封口を説明
する図であり、図４（Ａ）は、斜視図であり、図４
（Ｂ）は、図４（Ａ）におけるＡ−Ａ’線での断面図を
示す。電池缶１の開口部に嵌合した蓋体２と電池缶の開
口部との壁面との接触部からなる封口部３に沿ってパル
ス密度一定のレーザー４を照射することによって、照射
部に溶け込み領域５を形成し、照射経路６にしたがって
溶け込み領域５を移動しながら連続して封口を行ってお
り、図４（Ｂ）に示すように、蓋体２の板厚ｔのほぼ２
分の１程度の深さｄ１まで溶け込み領域５を形成して電
池缶１と蓋体２とをレーザ溶接を行って封口することが
行われていた。そして、封口を確実に行うために、レー
ザー照射により一様な溶け込み領域を形成するために各
種の提案がなされている。FIG. 4 is a view for explaining a conventional laser sealing, and FIG. 4 (A) is a perspective view.
FIG. 4B is a cross-sectional view taken along line AA ′ in FIG. By irradiating a laser 4 having a constant pulse density along a sealing portion 3 formed of a contact portion between a lid 2 fitted into the opening of the battery can 1 and a wall surface of the opening of the battery can, the laser 2 melts into the irradiation portion. The region 5 is formed, and the sealing is continuously performed while moving the penetration region 5 along the irradiation path 6, and as shown in FIG.
It has been practiced to form a penetration region 5 to a depth d1 of about one-half and to seal the battery can 1 and the lid 2 by laser welding. Various proposals have been made to form a uniform penetration region by laser irradiation in order to reliably perform sealing.
【０００４】例えば、レーザーをパルス密度一定で照射
すると、角部では、単位長さあたりのエネルギの増大と
溶け込み領域の内周と外周との寸法差により、内側の部
分でのエネルギの増大が生じ、直線部と角部では一定の
溶け込み領域が得られないという問題点があった。こう
した問題点を解決するために、嵌合部の角部の曲率半径
よりも小さい曲率半径で嵌合部の溶接を行うことによっ
て電池缶側を溶融させて厚みの薄い蓋の過度の溶融を防
止することが特開平８−３１５７８９号公報において提
案されている。For example, when a laser beam is irradiated at a constant pulse density, an increase in energy per unit length at a corner and an increase in energy at an inner portion occurs due to a dimensional difference between an inner periphery and an outer periphery of a penetration region. In addition, there has been a problem that a fixed penetration region cannot be obtained at the straight portion and the corner portion. In order to solve these problems, the battery can side is melted by welding the fitting part with a radius of curvature smaller than the radius of curvature of the corner part of the fitting part to prevent excessive melting of the thin lid. It has been proposed in Japanese Patent Application Laid-Open No. 8-315789.
【０００５】また、上面からレーザを照射する方法で
は、金属の溶け込み量が大きくなった場合には、電池缶
内部に金属溶融物が侵入する危険性があるので、これを
防止するために電池缶の側面方向からそれぞれの面に単
位時間当たりのレーザビームの照射量を一致させて溶融
する方法が特開平１１−１６７９０３号公報において提
案されている。このように、レーザ溶接においては、レ
ーザー照射部の金属の溶け込み量を一定にすることに主
眼点がおかれていた。In the method of irradiating a laser from the upper surface, if the amount of metal melted increases, there is a danger that a molten metal may enter the inside of the battery can. Japanese Patent Application Laid-Open No. H11-167903 proposes a method in which the laser beam irradiation amount per unit time is matched to each surface from the side direction of the above to fuse. As described above, in laser welding, the main focus has been on making the amount of penetration of the metal in the laser irradiation part constant.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、レーザー溶
接によって密閉型電池の蓋体を溶接する際に、封口部と
ともに強度の小さな部分を形成して内部圧力の増大によ
って破断して内部圧力を開放する箇所を作成することを
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 by laser welding, a small-strength portion is formed together with a sealing portion and the inner pressure is broken by increasing the internal pressure to reduce the internal pressure. It is an object to create a place to be opened.
【０００７】[0007]
【課題を解決するための手段】本発明の前記した課題
は、電池缶の開口部に蓋体を設けてレーザー溶接によっ
て電池缶と蓋体との封口部を融着した密閉型電池におい
て、封口部にレーザーによる溶け込み量が少ない領域を
形成して、電池内部の圧力の上昇時に開裂する部分を設
けた密閉型電池によって解決することができる。また、
本発明の電池において、溶け込み量が少ない領域がレー
ザーの照射量の調整、照射位置の調整、あるいは蓋体と
電池缶の嵌合部の接触面積を小さくすることによって実
現することができる。SUMMARY OF THE INVENTION An object of the present invention is to provide a sealed battery in which a lid is provided at an opening of a battery can and a sealing portion between the battery can and the lid is fused by laser welding. The problem can be solved by a sealed battery in which a region where the amount of penetration by the laser is small is formed in the portion, and a portion that cleaves when the pressure inside the battery increases is provided. Also,
In the battery of the present invention, the region where the amount of penetration is small can be realized by adjusting the irradiation amount of the laser, adjusting the irradiation position, or reducing the contact area between the lid and the fitting portion of the battery can.
【０００８】[0008]
【発明の実施の形態】本発明は、電池缶の開口部へ蓋体
を嵌合した後にレーザー溶接によって封口部を封口する
際に、封口部の一部に溶け込み領域のとけ込み量が少な
い部分を形成することによって、電池の異常な使用等に
よって内部の圧力が増大した際に、封口部を開裂して電
池の破裂等の事態を防止することが可能であることを見
出したものである。BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a method for sealing a sealing portion by laser welding after fitting a lid to an opening portion of a battery can. It has been found that, by forming a battery, when the internal pressure increases due to abnormal use of the battery or the like, it is possible to prevent the battery from exploding by opening the sealing portion.
【０００９】以下に図面を参照して本発明を説明する。
図１は、本発明の密閉型電池の電池缶の封口部を説明す
る図であり、図１（Ａ）は平面図であり、図１（Ｂ）
は、Ａ−Ａ’線で切断した断面図であり、図１（Ｃ）、
（Ｄ）は、Ｂ−Ｂ’線で切断した断面図である。電池缶
１の開口部に蓋体２を嵌合した後に、封口部に沿ってレ
ーザーを照射し封口部に溶け込み領域を形成して融着一
体化する際に、金属の溶け込み量が充分な完全封口部７
とともに金属の溶け込み量が少ない易開裂部８を形成し
たものである。そして、図１（Ｂ）に示すように、完全
封口部７においては、蓋体２の板厚ｔに対して、ほぼ２
分の１の深さのｄ１の溶け込み量が溶け込み領域５が得
られる強度のレーザーを照射して充分な封口を確保した
ものであり、易開裂部８においては、図１（Ｃ）に示す
ように、図１（Ｂ）に示す溶け込み量ｄ１に対して、ほ
ぼ半分の溶け込み量ｄ２の深さまで溶け込み量を減少さ
せたものであり、易開裂部８によって電池内部の圧力の
異常上昇時に内部圧力を開放することができる。また、
図１（Ｄ）は、電池缶１の開口部に蓋体２を嵌合した後
に、封口部に沿ってレーザーを照射する際に照射位置を
部分的にＣ方向へ移動することによって封口部の金属溶
けこみ量ｄ３が少ない易開裂部１８を形成したものであ
り、同様に易開裂部１８によって電池内部の圧力の異常
上昇時に内部圧力を開放するものである。The present invention will be described below with reference to the drawings.
FIG. 1 is a view for explaining a sealing portion of a battery can of a sealed battery according to the present invention. FIG. 1 (A) is a plan view and FIG. 1 (B).
FIG. 1C is a cross-sectional view taken along line AA ′, and FIG.
(D) is a sectional view taken along line BB '. After the lid 2 is fitted into the opening of the battery can 1, when a laser is irradiated along the sealing portion to form a melting region in the sealing portion and fuse and integrate, a sufficient amount of metal is completely melted. Sealing part 7
At the same time, an easily cleavable portion 8 having a small amount of metal penetration is formed. Then, as shown in FIG. 1 (B), in the complete sealing portion 7, the thickness t of the lid 2 is almost 2 mm.
A sufficient depth of d1 is obtained by irradiating a laser having an intensity enough to obtain the penetration region 5 with a penetration amount of d1 to secure a sufficient sealing. As shown in FIG. In addition, the penetration amount is reduced to a depth of approximately half the penetration amount d2 with respect to the penetration amount d1 shown in FIG. 1 (B). Can be opened. Also,
FIG. 1 (D) shows that, after the lid 2 is fitted into the opening of the battery can 1, the irradiation position is partially moved in the direction C when irradiating the laser along the sealing part, whereby the sealing part is closed. An easily cleavable portion 18 having a small amount of metal penetration d3 is formed. Similarly, the easily cleavable portion 18 releases the internal pressure when the pressure inside the battery abnormally rises.
【００１０】図２は、本発明の密閉型電池の他の例を封
口部を説明する図であり、平面図である。図２（Ａ）
は、長辺側に完全封口部７を形成するとともに短辺側の
平行部に易開裂部８を設けた例を示しており、図２
（Ｂ）は、長辺側および短辺側に完全封口部７を形成
し、角部の対角に易開裂部８を設けた例を示している。
また、図２（Ｃ）は、長辺側および短辺側に完全封口部
７を形成するとともに、４個の角の全てに易開裂部８を
設けた例を示している。FIG. 2 is a plan view illustrating another example of the sealed battery according to the present invention, which illustrates a sealing portion. FIG. 2 (A)
FIG. 2 shows an example in which a complete sealing portion 7 is formed on the long side and an easily cleavable portion 8 is provided on a parallel portion on the short side.
(B) shows an example in which the complete sealing portion 7 is formed on the long side and the short side, and the easily cleavable portion 8 is provided on the diagonal of the corner.
FIG. 2C shows an example in which complete sealing portions 7 are formed on the long side and the short side, and easily cleavable portions 8 are provided at all four corners.
【００１１】また、図３は、本発明の密閉型電池の他の
例の封口部を説明する図であり、易開裂部の断面を説明
する図である。図３（Ａ）は、電池缶２１の開口部に段
差２９を形成するとともに、蓋体２２の周囲の厚さｄ４
を部分的に薄くし、電池缶１１の開口部の壁面との接触
部の面積を小さくすることによって、溶接時の溶け込み
深さが浅い領域２５を形成して易開裂部を形成したもの
である。また、図３（Ｂ）は、電池缶３１の開口部に段
差３９を形成し、電池缶の開口部の厚みｄ５を部分的に
薄くし、蓋体３２との接触部の面積を小さくすることに
よって溶接時の溶けこみ深さが浅い領域３５を形成して
易開裂部を形成したものである。また、このような段差
を形成することにより、レーザー照射出力を一定の状態
でも溶融する部分の厚さが小さくなり、溶けこみ量の調
整が可能となるので封口部上に易開裂部を形成すること
ができる。FIG. 3 is a diagram for explaining a sealing portion of another example of the sealed battery of the present invention, and is a diagram for explaining a cross section of an easily cleavable portion. FIG. 3A shows a state in which a step 29 is formed in the opening of the battery can 21, and a thickness d 4 around the lid 22.
Is partially thinned and the area of the contact portion with the wall surface of the opening of the battery can 11 is reduced, thereby forming a region 25 having a shallow penetration depth at the time of welding to form an easily-cleavable portion. . FIG. 3B shows that the step 39 is formed in the opening of the battery can 31, the thickness d5 of the opening of the battery can is partially reduced, and the area of the contact portion with the lid 32 is reduced. Thus, a region 35 having a shallow penetration depth during welding is formed to form an easily cleavable portion. Further, by forming such a step, the thickness of the portion to be melted even when the laser irradiation output is constant is reduced, and the amount of the melt-in can be adjusted, so that an easily tearable portion is formed on the sealing portion. be able to.
【００１２】また、本発明の密閉型電池において、電池
缶の開口部に設ける段差は、板材から絞り加工等によっ
て電池缶を製造する際に、最終工程において段差形成用
ダイス等を用いて段差を形成することができる。そして
その後電池缶の開口部を切断して高さを一定にすること
によって製造することができる。また、蓋体の周囲に厚
みの薄い部分を形成する場合にも、板材に電極取り出し
端子部等を加工した後に、プレス加工によって厚みの薄
い部分を形成した後に、所望の大きさに裁断することに
よって作製することができる。本発明の密閉型電池は、
正極活物質としてマンガン酸リチウム等のリチウム遷移
金属複合酸化物を用いるとともに、負極活物質として炭
素質材料を用いたリチウムイオン電池に好適であるが、
その他の電池に適用することもできる。In the sealed battery according to the present invention, the step formed in the opening of the battery can is formed by using a step forming die or the like in the final step when the battery can is manufactured from a plate material by drawing or the like. Can be formed. Then, it can be manufactured by cutting the opening of the battery can to make the height constant. Also, when forming a thin portion around the lid, after processing the electrode extraction terminal portion and the like on the plate material, after forming the thin portion by pressing, the sheet material is cut into a desired size. Can be produced. The sealed battery of the present invention,
While using a lithium transition metal composite oxide such as lithium manganate as a positive electrode active material, it is suitable for a lithium ion battery using a carbonaceous material as a negative electrode active material,
It can be applied to other batteries.
【００１３】[0013]
【実施例】以下に、実施例を示し、本発明を説明する。 実施例１ 幅３０ｍｍ、高さ４８ｍｍ、厚さ６ｍｍの、アルミニウ
ム合金（Ａ３００３）製の電池缶を作製した。電池缶の
開口部の内面には、開口部の厚さ０．５ｍｍの壁面に、
壁面の厚さの２分の１の深さで、開口部から０．５ｍｍ
の深さまで段差を形成した。次いで、厚さ１ｍｍのアル
ミニウム合金製の蓋体の周囲に、電池缶の段差に嵌合す
る厚さ０．５ｍｍの段差を形成し、電池缶の開口部に嵌
合した後に、封口部に沿ってレーザーを照射する際にレ
ーザー照射強度を調整し、深さ０．４ｍｍの溶け込み部
と、電池缶の長辺に平行な部分に、長さ１０ｍｍの深さ
０．２ｍｍの溶け込み部を形成した。電池缶の底部に設
けた穴からから、窒素を注入して加圧試験を行ったとこ
ろ封口部の溶け込み量の少ない部分は、２ＭＰａ（ゲー
ジ圧）の印加で開裂した。一方、封口部に全て０．４ｍ
ｍの深さの溶け込み部を形成した場合には、加圧試験で
は４．９ＭＰａ（５０ｋｇｆ／ｃｍ2 ゲージ圧）まで
耐えることができた。The present invention will be described below with reference to examples. Example 1 A battery can made of an aluminum alloy (A3003) having a width of 30 mm, a height of 48 mm, and a thickness of 6 mm was produced. On the inner surface of the opening of the battery can, on the wall surface with a thickness of 0.5 mm of the opening,
0.5 mm deep from the opening at half the depth of the wall
A step was formed up to the depth. Next, a step having a thickness of 0.5 mm is formed around the lid made of an aluminum alloy having a thickness of 1 mm so as to fit the step of the battery can. The laser irradiation intensity was adjusted when irradiating the laser, and a penetration part having a depth of 0.4 mm and a penetration part having a length of 10 mm and a depth of 0.2 mm were formed in a portion parallel to the long side of the battery can. . A pressure test was performed by injecting nitrogen through a hole provided at the bottom of the battery can. As a result, a portion of the sealing portion where the amount of penetration was small was cleaved by application of 2 MPa (gauge pressure). On the other hand, all 0.4m
When a penetration part having a depth of m was formed, it could withstand up to 4.9 MPa (50 kgf / cm 2 gauge pressure) in a pressure test.
【００１４】[0014]
【発明の効果】本発明の密閉型電池は、電池缶にレーザ
ー溶接によって蓋体を封口する際に、封口部に金属の溶
け込み量の少ない領域を形成することによって、電池の
内部圧力の増大によって開裂する易開裂部を設けたの
で、封口処理工程で、封口と同時に電池の圧力増大時に
作動する圧力開閉部を同時に製造することができる。According to the sealed battery of the present invention, when the lid is sealed to the battery can by laser welding, a region with a small amount of metal penetration is formed in the sealed portion, thereby increasing the internal pressure of the battery. Since the easily cleavable portion is provided, a pressure opening / closing portion that operates when the pressure of the battery increases at the same time as the sealing can be simultaneously manufactured in the sealing process.
【図１】図１は、本発明の密閉型電池の封口部を説明す
る図である。FIG. 1 is a diagram illustrating a sealing portion of a sealed battery according to the present invention.
【図２】図２は、本発明の密閉型電池の封口部の他の例
を説明する図である。FIG. 2 is a view for explaining another example of the sealing portion of the sealed battery according to the present invention.
【図３】図３は、本発明の密閉型電池の封口部を他の例
を説明する図である。FIG. 3 is a view for explaining another example of the sealing portion of the sealed battery according to the present invention.
【図４】図４は、従来のレーザーによる封口を説明する
図である。FIG. 4 is a diagram for explaining a conventional laser sealing.
１、２１、３１…電池缶、２、２２、３２…蓋体、３…
封口部、４…レーザー、５、２５、３５…溶け込み領
域、６…照射経路、７…完全封口部、８、１８、２８…
易開裂部、２９、３９…段差1, 21, 31 ... battery can, 2, 22, 32 ... lid, 3 ...
Sealing part, 4 ... laser, 5, 25, 35 ... melting area, 6 ... irradiation path, 7 ... complete sealing part, 8, 18, 28 ...
Easy cleavage, 29, 39 ... step
Claims (2)
溶接によって電池缶と蓋体との封口部を融着した密閉型
電池において、封口部にレーザーによる溶け込み量が少
ない領域を形成して、電池内部の圧力の上昇時に開裂す
る易開裂部を設けたことを特徴とする密閉型電池。In a sealed battery in which a lid is provided at an opening of a battery can and a sealing portion between the battery can and the lid is fused by laser welding, an area where a small amount of laser is melted is formed in the sealing portion. A sealed type battery provided with an easy-to-cleave portion that is cleaved when the pressure inside the battery increases.
射量の調整、照射位置の調整、あるいは蓋体と電池缶の
嵌合部の接触面積を小さくすることによって形成された
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. A region having a small amount of penetration is formed by adjusting the irradiation amount of the laser, adjusting the irradiation position, or reducing the contact area between the lid and the fitting portion of the battery can. The sealed battery according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33731099A JP2001155698A (en) | 1999-11-29 | 1999-11-29 | Encapsulated type battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33731099A JP2001155698A (en) | 1999-11-29 | 1999-11-29 | Encapsulated type battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001155698A true JP2001155698A (en) | 2001-06-08 |
Family
ID=18307435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33731099A Pending JP2001155698A (en) | 1999-11-29 | 1999-11-29 | Encapsulated type battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001155698A (en) |
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