JP2000021365A - Manufacture of sealed battery - Google Patents
Manufacture of sealed batteryInfo
- Publication number
- JP2000021365A JP2000021365A JP10190708A JP19070898A JP2000021365A JP 2000021365 A JP2000021365 A JP 2000021365A JP 10190708 A JP10190708 A JP 10190708A JP 19070898 A JP19070898 A JP 19070898A JP 2000021365 A JP2000021365 A JP 2000021365A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- welding
- lid
- sealed
- battery lid
- 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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 238000003466 welding Methods 0.000 claims abstract description 70
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 8
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000956 alloy Substances 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 7
- 239000007769 metal material Substances 0.000 abstract description 10
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 abstract 1
- 230000005855 radiation Effects 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000003792 electrolyte Substances 0.000 description 7
- 238000005304 joining Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910000838 Al alloy Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000012768 molten material Substances 0.000 description 4
- 238000007665 sagging Methods 0.000 description 4
- 229910018131 Al-Mn Inorganic materials 0.000 description 2
- 229910018461 Al—Mn Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 229910052725 zinc Inorganic materials 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001325 element alloy Inorganic materials 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
-
- 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の製造方
法に関し、特に電池缶と電池蓋とをレーザー光の照射に
て溶接することに特徴のあるリチウム二次電池などの密
閉型電池の製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sealed battery, and more particularly to a method for manufacturing a sealed battery such as a lithium secondary battery, which is characterized in that a battery can and a battery lid are welded by laser light irradiation. About the method.
【０００２】[0002]
【従来の技術】図５は、通常の密閉型電池例の概念的な
断面図であり、図６〜図８はいずれも図５の丸Ｃで示す
部分の従来の態様例についての溶接前の拡大断面図であ
り、図９は図７の溶接後の拡大断面図であり、図１０は
図８の溶接後の拡大断面図である。図５において、１は
電池缶、２は電気絶縁板、３は発電要素体、３１は発電
要素体３の下部から露出する一方の電極リード、３２は
発電要素体３の上部から露出する他方の電極リード、４
はドーナツ状の電気絶縁板、５はその中央を貫通する電
解液注入口（図示せず）を有する電極、６は電池蓋、９
は電気絶縁ガスケット、１０はラプチャー機能を有する
安全機構である。電池蓋６は、電気絶縁ガスケット９を
介して電極５を有し、且つ安全機構１０をも有する。2. Description of the Related Art FIG. 5 is a conceptual cross-sectional view of an example of a normal sealed battery. FIGS. 6 to 8 show portions of a portion indicated by a circle C in FIG. 9 is an enlarged sectional view after welding of FIG. 7, and FIG. 10 is an enlarged sectional view after welding of FIG. In FIG. 5, 1 is a battery can, 2 is an electric insulating plate, 3 is a power generating element, 31 is one electrode lead exposed from the lower part of the power generating element 3, and 32 is the other electrode exposed from the upper part of the power generating element 3. Electrode lead, 4
Is a donut-shaped electric insulating plate, 5 is an electrode having an electrolyte inlet (not shown) penetrating the center thereof, 6 is a battery cover, 9
Is an electrically insulating gasket, and 10 is a safety mechanism having a rupture function. The battery lid 6 has the electrode 5 via the electrically insulating gasket 9 and also has a safety mechanism 10.
【０００３】上記の密閉型電池は、鉄やアルミニウムな
どの導電性金属からなる有底の電池缶１内に発電要素体
３を電気絶縁板２、４と共に収納し、発電要素体３から
導出された一方の電極リード３１の先端を電池缶１の底
内面あるいは内側面に、他方の電極リード３２の先端を
電池蓋６中の電極５の裏面にそれぞれ電気的に接続し、
電池蓋６を電池缶１の開口上端部１１に設置してその合
わせ部Ｇを溶接して有底の電池缶１に蓋をし、電極５に
設けられた電解液注入口から電池缶１内を脱気すると共
に電解液を注入して発電要素体３を電解液にて含浸し、
最後に電解液注入口を封止用部材（図示せず）にて封止
して製造される。In the above sealed battery, a power generating element 3 is housed together with electric insulating plates 2 and 4 in a bottomed battery can 1 made of a conductive metal such as iron or aluminum, and is led out of the power generating element 3. The tip of one electrode lead 31 is electrically connected to the bottom inner surface or inside surface of the battery can 1, and the tip of the other electrode lead 32 is electrically connected to the back surface of the electrode 5 in the battery lid 6, respectively.
The battery lid 6 is set on the upper end 11 of the opening of the battery can 1, the joint G is welded to cover the bottomed battery can 1, and the inside of the battery can 1 is inserted through the electrolyte injection hole provided in the electrode 5. And the electrolyte is injected to impregnate the power generating element body 3 with the electrolyte,
Finally, the electrolyte injection port is sealed with a sealing member (not shown) to manufacture.
【０００４】図６〜図８において、電池缶１と電池蓋６
との合わせ部Ｇの溶接は、現在、局部的加熱が可能なレ
ーザー光ＬＤの照射による溶接が工業的に多用されてい
る。このレーザー溶接は、局部を高温度に加熱すること
が可能なために、鉄材のアーク溶接の場合に使用される
溶接棒のような溶接補助部材を用いることなく、被溶接
体自体の一部を溶融し再凝固させて溶接する。FIGS. 6 to 8 show a battery can 1 and a battery cover 6.
At present, the welding of the joint portion G with the laser beam irradiation by laser light LD capable of locally heating is industrially frequently used. Since this laser welding can heat the local area to a high temperature, a part of the workpiece itself is used without using a welding auxiliary member such as a welding rod used in the case of arc welding of iron material. It is melted, re-solidified and welded.
【０００５】ところで図６の従来例では、電池缶１、電
池蓋６共にその端部は無加工のままであるので、電池蓋
６を電池缶１の開口上端部１１の上に単に乗せた状態に
て両部材は溶接される。しかし電池蓋６の電池缶１上で
の位置が不安定なために、溶接作業中に電池蓋６が電池
缶１から外れて溶接が不完全となったり、あるいは外れ
た部分からレーザー光ＬＤの一部が電池缶１の内部に入
って一般的に可燃性である電解液を加熱燃焼せしめる危
険性がある。In the conventional example shown in FIG. 6, since the ends of both the battery can 1 and the battery cover 6 are left unprocessed, the battery cover 6 is simply placed on the upper end 11 of the opening of the battery can 1. At, both members are welded. However, since the position of the battery cover 6 on the battery can 1 is unstable, the battery cover 6 is detached from the battery can 1 during welding work, and welding is incomplete, or the laser light LD is supplied from the detached portion. There is a danger that a part will enter the inside of the battery can 1 and heat and burn the generally flammable electrolyte.
【０００６】図７の従来例では、電池蓋６の端部６１は
電池缶の開口上端面１４上に合わせ得る溶接面６１１と
電池缶１の内壁面１５と接し得る位置合わせ面６１２と
を有する段構造を有している。そして位置合わせ面６１
２の存在により、電池蓋６は電池缶１上に安定して設置
することができるので図６の場合のような問題は解消す
る。しかし安定設置が実現したと言えども、未だつぎの
問題が残存している。即ち、その場合の溶接面６１１と
開口上端面１４上との合わせ部Ｇを溶接するために図示
する通りにレーザー光ＬＤを照射すると、合わせ部Ｇは
図６の合わせ部Ｇと同様に、前記したレーザー溶接の機
構の観点に立脚すると一般的に比較的大きな間隙を有
し、この間隙は図７で梨地で示す部分の溶融体の一部で
充填されるのであるが、溶融体の絶対量が少ないために
溶接後では図９に示すように合わせ部Ｇの外側端Ｇ１に
窪みが生じる問題がある。外側端Ｇ１に窪みが生じると
概して溶接強度が低下しがちであって、このために電池
の使用中に溶接部が外れる危険性がある。In the conventional example of FIG. 7, the end portion 61 of the battery lid 6 has a welding surface 611 that can be fitted on the opening upper end surface 14 of the battery can and a positioning surface 612 that can be in contact with the inner wall surface 15 of the battery can 1. It has a step structure. And the alignment surface 61
Due to the presence of 2, the battery lid 6 can be stably installed on the battery can 1, so that the problem as shown in FIG. However, although stable installation has been achieved, the following problems still remain. That is, when the laser beam LD is irradiated as shown in the drawing to weld the joint G between the welding surface 611 and the upper end surface 14 of the opening, the joint G becomes the same as the joint G in FIG. From the viewpoint of the laser welding mechanism described above, there is generally a relatively large gap, which is filled with a part of the melt indicated by a satin pattern in FIG. Therefore, there is a problem that the outer end G1 of the mating portion G is dented after welding as shown in FIG. When a depression occurs at the outer end G1, the welding strength generally tends to decrease, and there is a risk that the welded portion may come off during use of the battery.
【０００７】図７に示す端部６１の段構造は、該端部６
１の切削による精密加工にて形成された場合に得られる
が、工業的にはプレス加工にて流れ作業的に形成するこ
とが能率的であって、その場合にはプレス加工に特有の
所謂“抜きダレ”現象により、図８に示すように端部６
１の最先端面６１４と溶接面６１１との稜がダレ部６１
３となる問題がある。ダレ部６１３が存在すると、溶接
後では図１０に示すように、図９の場合以上に合わせ部
Ｇの外側端Ｇ１に一層大きな窪みが生じる。The step structure of the end 61 shown in FIG.
1 is obtained by precision machining by cutting, but it is efficient to form it by press working in an industrial process, and in that case, the so-called " As shown in FIG.
The ridge between the leading edge surface 614 and the welding surface 611 is the dripping portion 61
There is a problem of 3. When the sagging portion 613 is present, as shown in FIG. 10, after welding, a larger dent is formed at the outer end G1 of the fitting portion G than in the case of FIG.
【０００８】プレス加工に特有の抜きダレ現象は、電池
蓋６がアルミニウム系金属材製である場合に特に大き
く、しかも近時にあっては電池の軽量化を目的として、
電池缶１と電池蓋６とをアルミニウム系金属材で形成す
る要求が多くなっている。[0008] The dropping phenomenon peculiar to the press working is particularly large when the battery lid 6 is made of an aluminum-based metal material, and more recently, for the purpose of reducing the weight of the battery.
There is an increasing demand for forming the battery can 1 and the battery lid 6 from an aluminum-based metal material.
【０００９】[0009]
【発明が解決しようとする課題】上記に鑑み本発明は、
電池蓋と電池缶とをレーザー光の照射により良好に溶接
し得る密閉型電池の製造方法を提供することを課題とす
る。SUMMARY OF THE INVENTION In view of the above, the present invention provides
It is an object of the present invention to provide a method of manufacturing a sealed battery capable of satisfactorily welding a battery lid and a battery can by irradiating a laser beam.
【００１０】[0010]
【課題を解決するための手段】本発明の課題は、つぎの
手段にて解決される。 (1) 電池蓋と電池缶との溶接所要個所を溶接する際、電
池蓋として電池缶の開口面積より大きい面積を有し、こ
のために電池缶の開口上端面と外壁面との稜線を越えて
存在する先端部分を有するものを用い、該先端部分の少
なくとも一部が溶融してその溶融体の少なくとも一部に
て上記溶接所要個所の間隙が充填されるようにレーザー
光を照射することを特徴とする密閉型電池の製造方法。 (2) 電池蓋は、その先端部分を含む端部がプレス加工に
て成形されて電池缶の開口上端面上に合わせ得る溶接面
と、電池缶の内壁面と接し得る位置合わせ面とを有する
段構造を呈し、且つ溶接所要個所が電池蓋の溶接面と電
池缶の開口上端面との合わせ部である上記(1) 記載の密
閉型電池の製造方法。 (3) 電池蓋の先端部分が電池缶の開口上端面と外壁面と
の稜線を越えて折れ曲がって電池缶の外壁面上に至って
おり、且つ溶接所要個所が電池蓋の先端部分と電池缶の
外壁面との合わせ部である上記(1) 記載の密閉型電池の
製造方法。 (4) 溶接所要個所の外側端にレーザー光を電池缶の外壁
面に対して１２０度未満の角度で照射する上記(1) 〜
(3) のいずれかに記載の密閉型電池の製造方法。 (5) 電池缶と電池蓋が、共にアルミニウム系合金にて形
成されてなる上記(1) 〜(4) のいずれかに記載の密閉型
電池の製造方法。The object of the present invention is solved by the following means. (1) When welding required parts between the battery lid and the battery can, the battery lid has a larger area than the opening area of the battery can as a battery lid. Using a laser beam having at least a part of the tip part, and irradiating a laser beam such that at least a part of the melt fills the gap at the required welding point. A method for manufacturing a sealed battery. (2) The battery lid has a welded surface whose end including a tip portion is formed by press working and can be fitted on the upper end surface of the opening of the battery can, and a positioning surface that can be in contact with the inner wall surface of the battery can. The method for producing a sealed battery according to the above (1), wherein the sealed battery is provided with a stepped structure, and a required portion to be welded is a joining portion between a welding surface of a battery lid and an upper end surface of an opening of a battery can. (3) The tip of the battery lid is bent over the ridgeline between the upper end surface of the battery can and the outer wall to reach the outer wall of the battery can. The method for producing a sealed battery according to the above (1), which is a joining portion with an outer wall surface. (4) Irradiate the outer edge of the required welding spot with a laser beam to the outer wall surface of the battery can at an angle of less than 120 degrees.
The method for producing a sealed battery according to any one of (3) and (4). (5) The method for producing a sealed battery according to any one of the above (1) to (4), wherein the battery can and the battery lid are both formed of an aluminum-based alloy.
【００１１】[0011]
【作用】従来は、溶接所要個所において対向する電池缶
と電池蓋との各壁表面層の溶融体のみにより溶接されて
いたので溶接所要個所の溶融体による充填は不十分とな
りがちであったが、本発明では上記の溶融体に加えて、
電池蓋の上記先端部分の溶融体の少なくとも一部にても
該溶接所要個所が充填されるので間隙の溶融体による充
填が十分となり、この結果、溶接所要個所の溶接強度が
安定化し、また溶接強度が向上する。In the prior art, at the required welding points, the opposite sides of the battery can and the battery lid were welded only by the molten material of the respective wall surface layers. In the present invention, in addition to the above melt,
At least a part of the molten material at the tip of the battery lid is filled with the required welding point, so that the gap is sufficiently filled with the molten material. As a result, the welding strength at the required welding point is stabilized, and Strength is improved.
【００１２】[0012]
【発明の実施の形態】以下、本発明を図例により一層詳
細に説明する。図１〜図４は、いずれも前記図６〜図８
などに対応する本発明の実施例の部分拡大断面図であっ
て、溶接前における溶接所要個所の部分拡大断面図であ
る。図１〜図４においては、前出の図と共通する部分に
ついては同じ番号を付しているので、以下においては図
５〜図１０を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. 1 to 4 are the same as those shown in FIGS.
It is a partial expanded sectional view of the Example of the present invention corresponding to etc., and is a partial expanded sectional view of a required spot before welding. In FIGS. 1 to 4, the same parts as those in the previous figures are denoted by the same reference numerals, and will be described below with reference to FIGS. 5 to 10.
【００１３】図１〜図４において、電池蓋６としては電
池缶１の開口面積より大きく、このために電池缶１の開
口上端面１４と外壁面１２との稜線を越えて存在し、長
さＬを有する先端部分６１５を有するものを用いる。こ
こに電池缶１の開口面積とは、上記の稜線で囲まれた面
積である。電池蓋６は、巨視的には板状を呈していて表
裏の両面を有するが、それらの各投影面積が電池蓋６の
面積となる。In FIG. 1 to FIG. 4, the battery lid 6 is larger than the opening area of the battery can 1, so that the battery lid 6 exists beyond the ridge line between the upper end surface 14 of the battery can 1 and the outer wall surface 12 and has a length. One having a tip portion 615 having L is used. Here, the opening area of the battery can 1 is an area surrounded by the ridge line. The battery lid 6 has a macroscopic plate shape and has both front and rear surfaces, and each projected area thereof is the area of the battery lid 6.
【００１４】溶接前における電池蓋６の表裏の各面積
は、図１の実施例の場合には互いに同じであるが、図２
の実施例ではその最先端面６１４の一部がダレ部６１３
となっているので、その裏面面積は表面面積より僅かに
小さくなっている。一方、図３の実施例ではその最先端
面６１４がテーパとなっていてその裏面面積は表面面積
より僅かに大きくなっている。本発明において、電池蓋
６の表裏両面の面積が互いに異なる場合には、広い方の
面の面積をもって電池蓋６の面積としてよい。よって例
えば図３の実施例の変形態様として、上記の最先端面６
１４が逆テーパとなっていて表面面積が裏面面積より広
いものであってもよい。図４の実施例では電池蓋６は長
い先端部分６１５を有し、先端部分６１５は電池缶１の
開口上端面１４と外壁面１２との稜線を越えて折れ曲が
って電池缶１の外壁面１２上に至っている。The front and back areas of the battery cover 6 before welding are the same in the embodiment of FIG.
In the embodiment of FIG.
Therefore, the area of the back surface is slightly smaller than the surface area. On the other hand, in the embodiment of FIG. 3, the foremost surface 614 is tapered, and the back surface area is slightly larger than the front surface area. In the present invention, when the areas of the front and back surfaces of the battery cover 6 are different from each other, the area of the wider surface may be used as the area of the battery cover 6. Therefore, for example, as a modification of the embodiment of FIG.
14 may be reverse tapered and the surface area may be larger than the back surface area. In the embodiment of FIG. 4, the battery lid 6 has a long tip portion 615, and the tip portion 615 bends beyond the ridgeline between the opening upper end surface 14 of the battery can 1 and the outer wall surface 12 so as to be on the outer wall surface 12 of the battery can 1. Has been reached.
【００１５】本発明においては、電池蓋６と電池缶１と
の溶接所要個所は、図１〜図３の実施例におけるように
溶接面６１１と開口上端面１４との合わせ部Ｇであって
もよく、図４の実施例におけるように電池蓋６の先端部
分６１５の裏面と電池缶１の外壁面１２との対向面間Ｇ
であってもよい。In the present invention, the required portion of welding between the battery lid 6 and the battery can 1 may be a joint G between the welding surface 611 and the upper end surface 14 of the opening as in the embodiment of FIGS. 4, the gap G between the back surface of the tip portion 615 of the battery lid 6 and the outer wall surface 12 of the battery can 1 as in the embodiment of FIG.
It may be.
【００１６】電池蓋６と電池缶１との溶接所要個所を溶
接する際、各先端部分６１５は、少なくともその一部が
レーザー光ＬＤの照射を受けて加熱溶融し、その溶融体
の少なくとも一部が上記溶接所要個所の間隙を充填して
溶接所要個所の溶接強度を改善するなどの機能をなす。
よって図１〜図４の各実施例における先端部分６１５
は、かかる機能をなし得る大きさであればよい。具体的
にそれは、溶接所要個所の後記する所望溶接長の単位長
あたりの体積（図１〜４に示す長さＬを有する各先端部
分６１５の断面積×所望溶接長の単位長さ）にして、
０．０１〜１ｍｍ3／ｍｍ程度、特に０．０２〜０．２
ｍｍ3 ／ｍｍ程度であることが好ましい。所望溶接長に
ついては、電池の製品規格や電池ユーザーの仕様により
決定され、図１〜図３の場合では通常、合わせ部Ｇの全
長（外側端Ｇ１から電池蓋６の位置合わせ面６１２まで
の距離）がそれに該当する。一方、図４の場合で先端部
分６１５の長さＬがかなり長い場合には、その対向面間
Ｇのうちで上記の規格や仕様により決定される必要部分
のみを所望溶接長としてよい。When welding required portions of the battery lid 6 and the battery can 1, at least a part of each of the tip portions 615 is heated and melted by being irradiated with the laser beam LD, and at least a part of the molten material is melted. Performs functions such as filling the gap at the required welding position to improve the welding strength at the required welding position.
Therefore, the tip portion 615 in each embodiment of FIGS.
Should be large enough to perform such a function. Specifically, it is expressed as a volume per unit length of a desired welding length (a sectional area of each tip portion 615 having a length L shown in FIGS. 1 to 4 × a unit length of a desired welding length), which will be described later. ,
About 0.01 to 1 mm 3 / mm, particularly 0.02 to 0.2
It is preferably about mm 3 / mm. The desired welding length is determined by the product standard of the battery and the specifications of the battery user. In the case of FIGS. 1 to 3, the desired welding length is generally the entire length of the fitting portion G (the distance from the outer end G1 to the positioning surface 612 of the battery cover 6). ) Corresponds to that. On the other hand, in the case of FIG. 4, when the length L of the distal end portion 615 is considerably long, only the necessary portion determined by the above-mentioned standard or specification among the facing surfaces G may be the desired welding length.
【００１７】図１〜図３の各実施例で使用の電池蓋６
は、それの電池缶１上での前記した安定設置のために、
その端部６１は電池缶の開口上端面１４上に合わせ得る
溶接面６１１と電池缶１の内壁面１５と接し得る位置合
わせ面６１２とを有する段構造を有している。そのうち
の図２での段構造は、プレス加工にて形成されて端部６
１の最先端面６１４と溶接面６１１との稜がダレ部６１
３となっている。The battery cover 6 used in each of the embodiments shown in FIGS.
For its stable installation on the battery can 1 as described above,
The end 61 has a stepped structure having a welding surface 611 that can be fitted on the opening upper end surface 14 of the battery can and an alignment surface 612 that can be in contact with the inner wall surface 15 of the battery can 1. Among them, the step structure shown in FIG.
The ridge between the leading edge surface 614 and the welding surface 611 is the dripping portion 61
It is 3.
【００１８】本発明においては、各実施例の先端部分６
１５の少なくとも一部が溶融してその溶融体の少なくと
も一部にて各溶接所要個所の間隙が充填されるようにレ
ーザー光を照射する。図１〜図３の各実施例では、溶接
所要個所は合わせ部Ｇであるから、ある程度の大きさの
ビーム径を有するレーザー光ＬＤを用いてそのビームの
中心を図示する通り、電池缶１の外壁面１２に対して１
２０度程度未満の角度θにて合わせ部Ｇの外側端Ｇ１に
向けて、あるいは外側端Ｇ１よりやゝ先端部分６１５寄
りに向けて照射し、電池蓋６の端部６１、特にその先端
部分６１５と溶接面６１１並びにその近傍などの梨地で
示す個所あたり、および電池缶１の開口上端部１１、特
に開口上端面１４並びにその近傍などの梨地で示す個所
あたりを加熱し溶融することが好ましい。かくすると合
わせ部Ｇが良好に溶接する。In the present invention, the tip portion 6 of each embodiment is used.
The laser beam is irradiated so that at least a part of the melt 15 is filled and at least a part of the melt fills the gap at each required welding point. In each of the embodiments shown in FIGS. 1 to 3, the welding required portion is the joining portion G. Therefore, as shown in the drawing, the center of the beam is shown using a laser beam LD having a certain beam diameter. 1 for outer wall 12
Irradiation is performed at an angle θ of less than about 20 degrees toward the outer end G1 of the joining portion G, or slightly toward the tip portion 615 from the outer end G1, and the end portion 61 of the battery lid 6, particularly the tip portion 615. It is preferable to heat and melt a portion indicated by a satin finish, such as the welding surface 611 and the vicinity thereof, and a portion indicated by a satin finish, such as the opening upper end portion 11 of the battery can 1, particularly the opening upper end surface 14 and the vicinity thereof. Thus, the joint G is welded well.
【００１９】図１〜図３の各実施例におけるレーザー光
ＬＤのビーム径は、電池蓋６の端部６１の厚み、電池缶
１の開口上端部１１の厚み、および先端部分６１５の前
記した大きさ（体積）などによって異なるが、例えば、
厚さ６〜１４ｍｍ程度、幅２２〜３４ｍｍ程度、高さ４
０〜６０ｍｍ程度のサイズのアルミニウム系合金製の電
池の場合であれば、４０〜１０００μｍ程度が適当であ
る。なお上記した範囲を照射し得る限り、レーザー光Ｌ
Ｄのビームの断面形状は円形以外にも例えば楕円形や角
形などの非円形であってもよい。The beam diameter of the laser beam LD in each of the embodiments shown in FIGS. 1 to 3 is determined by the thickness of the end portion 61 of the battery lid 6, the thickness of the upper end portion 11 of the opening of the battery can 1, and the aforementioned size of the tip portion 615. Although it depends on the volume (volume), for example,
About 6-14mm in thickness, about 22-34mm in width, and 4 in height
In the case of an aluminum alloy battery having a size of about 0 to 60 mm, about 40 to 1000 μm is appropriate. As long as the above range can be irradiated, the laser beam L
The cross-sectional shape of the beam D may be non-circular, such as elliptical or square, other than circular.
【００２０】溶接のためのレーザー光としては、連続波
レーザー光（ＣＷ）やパルスレーザー光（ＰＷ）など、
従来から斯界で周知あるいは実用されているものであっ
てよい。なお溶接の際に生じる溶融体の冷却速度が早過
ぎるとその凝固体に割れが生じることがある。よってか
かる場合には、ＰＷの上にＣＷを重乗させる、ＰＷの波
形の制御をする、などの照射方法によりレーザー光の照
射により生じた溶融体の凝固が始まる段階以降において
凝固体が徐冷するようにレーザー光をその照射エネルギ
ー量が逓減するように照射することが好ましい。レーザ
ー光の照射角度θは、前記した通り１２０度程度未満と
するのがよいが、特に１０〜１２０度程度、さらには３
０〜６０度程度が好ましい。The laser light for welding includes continuous wave laser light (CW) and pulse laser light (PW).
Conventionally known or practically used in the art. If the cooling rate of the melt generated during welding is too fast, cracks may occur in the solidified body. Therefore, in such a case, the solidified body is gradually cooled after the stage where solidification of the melt generated by the irradiation of the laser beam is started by an irradiation method such as superimposing the CW on the PW or controlling the waveform of the PW. It is preferable to irradiate the laser beam so that the irradiation energy amount gradually decreases. The irradiation angle θ of the laser beam is preferably less than about 120 degrees as described above, but is particularly preferably about 10 to 120 degrees, and more preferably about 3 degrees.
It is preferably about 0 to 60 degrees.
【００２１】図４の実施例では、溶接所要個所は電池蓋
６の先端部分６１５の裏面と電池缶１の外壁面１２との
対向面間Ｇであるので、該対向面の外側端Ｇ１、あるい
は外側端Ｇ１よりやゝ先端部分６１５寄りとして照射
し、先端部分６１５と電池缶１の外壁面１２との梨地で
示す個所を加熱し溶融するようにレーザー光を照射する
ことが好ましい。レーザー光ＬＤの種類、そのビーム
径、および照射角度θについては、図１などの実施例で
の説明がここでも当てはまる。In the embodiment shown in FIG. 4, the required welding point is the gap G between the back surface of the tip portion 615 of the battery cover 6 and the outer wall surface 12 of the battery can 1, so that the outer end G1 of the facing surface, or It is preferable to irradiate the laser beam so as to be slightly closer to the distal end portion 615 than the outer end G1 and to heat and melt the matted portion between the distal end portion 615 and the outer wall surface 12 of the battery can 1. Regarding the type of the laser light LD, its beam diameter, and the irradiation angle θ, the description in the embodiment such as FIG.
【００２２】本発明において電池缶１と電池蓋６の各形
成材料としては、斯界で周知あるいは実用されているも
の、例えば、鉄系金属材、アルミニウム系金属材などで
ある。アルミニウム系金属材は、抜きダレ現象が生じ易
い欠点があっても本発明においてはそれが実際的に問題
とならず、且つ軽量であるので特に好ましい。In the present invention, the material for forming the battery can 1 and the battery lid 6 is a material known or used in the art, such as an iron-based metal material and an aluminum-based metal material. The aluminum-based metal material is particularly preferable because it does not actually cause a problem in the present invention even if it has a drawback that the punch-out phenomenon easily occurs and is lightweight.
【００２３】アルミニウム系金属材としては、純アルミ
ニウムの他に、基本的に純アルミニウムの軽量性を維持
し、且つ純アルミニウムの機械的強度が改善されたアル
ミニウム合金類も用いられる。アルミニウム合金類とし
ては、Ｍｎ、Ｍｇ、Ｓｉ、Ｆｅ、Ｃｕ、Ｚｎ、Ｃｒ、Ｔ
ｉ、あるいはその他の元素を含む二〜多元系合金であっ
てよい。就中Ａｌ−Ｍｎ系合金、特にＡｌの含有量が少
なくとも８０重量％、特に少なくとも９０重量％であ
り、Ｍｎの含有量が０．１〜２．５重量％、特に０．１
〜２．０重量％のものが好ましい。Ａｌ−Ｍｎ系合金
は、Ｍｇ、Ｓｉ、Ｆｅ、Ｃｕ、Ｚｎ、Ｃｒ、Ｔｉ、ある
いはその他の元素を含むものであってもよい。Ａｌ−Ｍ
ｎ系合金の具体例として、ＪＩＳ呼称番号の２０１４、
２０１７、２０２４、３００３、３００４などが例示し
得る。なお、上記したアルミニウム系金属材やＡｌ−Ｍ
ｎ系合金などは、アルミニウムまたはその合金類に通常
含まれている不純物を通常量程度含有していてもよい。As the aluminum-based metal material, besides pure aluminum, aluminum alloys which basically maintain the lightness of pure aluminum and have improved mechanical strength of pure aluminum are also used. Aluminum alloys include Mn, Mg, Si, Fe, Cu, Zn, Cr, T
It may be a binary to multi-element alloy containing i or another element. In particular, Al-Mn based alloys, in particular, the Al content is at least 80% by weight, especially at least 90% by weight, and the Mn content is 0.1-2.5% by weight, especially 0.1%.
~ 2.0 wt% is preferred. The Al-Mn-based alloy may include Mg, Si, Fe, Cu, Zn, Cr, Ti, or other elements. Al-M
Specific examples of the n-based alloy include JIS designation number 2014,
2017, 2024, 3003, 3004, and the like. The above-mentioned aluminum-based metal material or Al-M
An n-based alloy or the like may contain a usual amount of impurities usually contained in aluminum or its alloys.
【００２４】なお電池缶１および電池蓋６の各形成材料
は、溶接の容易さ並びに溶接部の機械的強度の長期安定
性の観点から、互いに組成並びに融点が似通っているこ
とが好ましく、特に互いの融点の差が１０℃以内、特に
５℃以内であることが好ましい。It is preferable that the materials for forming the battery can 1 and the battery cover 6 have similar compositions and melting points from the viewpoint of ease of welding and long-term stability of the mechanical strength of the welded portion. Is preferably within 10 ° C., particularly preferably within 5 ° C.
【００２５】上記の各実施例において例えばアルミニウ
ム製電池缶を用いた０６２２４８型の密閉角型リチウム
二次電池を例にとると、電池缶１の厚みは、０．１〜１
ｍｍ程度であり、電池蓋６の厚みは、０．５〜１．０ｍ
ｍ程度である。In each of the above embodiments, for example, a sealed rectangular lithium secondary battery of type 062248 using an aluminum battery can is used.
mm, and the thickness of the battery cover 6 is 0.5 to 1.0 m.
m.
【００２６】[0026]
【実施例】以下、実施例により本発明を一層詳細に説明
するとともに、比較例をも示して本発明の顕著な作用を
明らかにする。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, and comparative examples will also be shown to clarify the remarkable effects of the present invention.
【００２７】実施例１ ０６２２４８型の角型リチウム二次電池の製造におい
て、合わせ部Ｇの断面構造が図２と略同じであって、先
端部分６１５（長さＬ：０．３ｍｍ）を有する電池蓋６
（厚み：０．７ｍｍ）と電池缶１（厚み：０．５ｍｍ）
との溶接を行った。その際、電池蓋６、電池缶１共にＪ
ＩＳ呼称番号の２０１４のアルミニウム合金製であっ
て、電池蓋６のダレ部６１３の平均半径ｒは１００μｍ
であった。また、ビーム径が６００μｍであり、出力が
約３５０ｋＷの連続波（ＣＷ）レーザー光ＬＤを合わせ
部Ｇの外側端Ｇ１あたりを中心として約６００ｍｍ／分
の速度で照射した。Example 1 In the production of a 062248 type prismatic lithium secondary battery, a battery having the same cross-sectional structure as that of FIG. 2 and having a tip 615 (length L: 0.3 mm) is used. Lid 6
(Thickness: 0.7 mm) and battery can 1 (thickness: 0.5 mm)
And welding. At that time, both the battery lid 6 and the battery can 1
It is made of an aluminum alloy having an IS designation number of 2014, and the average radius r of the sag portion 613 of the battery cover 6 is 100 μm.
Met. A continuous wave (CW) laser beam LD having a beam diameter of 600 μm and an output of about 350 kW was irradiated at a rate of about 600 mm / min centering around the outer end G1 of the joining section G.
【００２８】比較例１ 図７に示す断面構造を有する、即ち先端部分６１５を有
しない電池蓋６を用いた以外は実施例１と同様にして電
池蓋６と電池缶１との溶接を行った。Comparative Example 1 The battery lid 6 and the battery can 1 were welded in the same manner as in Example 1 except that the battery lid 6 having the sectional structure shown in FIG. .
【００２９】実施例１と比較例１にて製造した各角型リ
チウム二次電池について、つぎに示す方法にてレーザー
溶接部の溶接の良否を評価した。その結果、実施例１か
ら得られた電池は電池内圧力が２０ｋｇ／ｃｍ2 を越え
ても溶接部から空気のリークが生じなかったが、比較例
１から得られた電池は約１５ｋｇ／ｃｍ2 で溶接部から
空気のリークが生じた。With respect to each of the prismatic lithium secondary batteries manufactured in Example 1 and Comparative Example 1, the quality of welding of the laser weld was evaluated by the following method. As a result, the battery obtained from Example 1 did not leak air from the weld even when the internal pressure of the battery exceeded 20 kg / cm 2 , whereas the battery obtained from Comparative Example 1 had about 15 kg / cm 2. As a result, air leaked from the weld.
【００３０】〔レーザー溶接部の溶接良否の評価方法〕
電池缶に溶接した通気管を通じて空気を電池内に送り込
んで電池内の圧力を漸次上昇させ、溶接部から空気のリ
ークが生じたときの電池内の圧力を測定する。[Evaluation method of welding quality of laser welded part]
Air is fed into the battery through a vent pipe welded to the battery can to gradually increase the pressure inside the battery, and the pressure inside the battery when air leaks from the weld is measured.
【００３１】[0031]
【発明の効果】本発明によれば、電池缶と電池蓋との溶
接所要個所をレーザー溶接にて良好に溶接することがで
きる。また電池蓋としては、その端部は溶接面と位置合
わせ面とを有する段構造とすることにより電池缶上に電
池蓋を安定に設置し得て、両者のレーザー溶接が一層容
易となる。電池蓋の端部は、通常のプレス加工にて容易
に段構造に加工することができる。その際、プレス加工
に特有の抜きダレ現象にて一般的にはレーザー溶接上で
不利となるダレが電池蓋の端部に生じ、しかもそのダレ
は電池蓋の形成材料がアルミニウム系金属材である場合
に特に顕著であるが、本発明によれば、かかるダレが生
じて電池缶と電池蓋との合わせ部の溶接前における間隙
が大きくなっても、該間隙を充填して両者を良好に溶接
することができる。しかして本発明は、軽量の故に斯界
で需要の高いアルミニウム系金属材製の電池缶と電池蓋
とからなる密閉型電池、就中、電解液内蔵のリチウム二
次電池などの密閉型電池、特に角型の密閉型電池の製造
に好適である。According to the present invention, the required portions of the battery can and the battery lid can be satisfactorily welded by laser welding. The battery lid has a stepped structure having a welding surface and an alignment surface at its end, so that the battery lid can be stably placed on the battery can, and laser welding of both can be further facilitated. The end of the battery lid can be easily processed into a stepped structure by ordinary pressing. At this time, the sagging phenomenon peculiar to press working generally causes sagging at the end of the battery lid, which is disadvantageous on laser welding, and the sagging is made of an aluminum-based metal material for the battery lid. According to the present invention, even if such a droop occurs and the gap between the joining portion of the battery can and the battery lid before welding becomes large, the gap is filled and the two are welded well. can do. Thus, the present invention is a sealed battery comprising a battery can and a battery lid made of an aluminum-based metal material, which is in high demand in the art because of its light weight, especially, a sealed battery such as a lithium secondary battery with a built-in electrolyte, It is suitable for manufacturing a prismatic sealed battery.
【図１】本発明の実施例における部分拡大断面図であ
る。FIG. 1 is a partially enlarged sectional view of an embodiment of the present invention.
【図２】本発明の他の実施例における部分拡大断面図で
ある。FIG. 2 is a partially enlarged sectional view of another embodiment of the present invention.
【図３】本発明のさらに他の実施例における部分拡大断
面図である。FIG. 3 is a partially enlarged sectional view of still another embodiment of the present invention.
【図４】本発明のさらに他の実施例における部分拡大断
面図である。FIG. 4 is a partially enlarged sectional view of still another embodiment of the present invention.
【図５】通常の密閉型電池例の概念的な断面図である。FIG. 5 is a conceptual cross-sectional view of a typical sealed battery example.
【図６】図５の丸Ｃで示す部分の態様例における溶接前
の拡大断面図である。FIG. 6 is an enlarged cross-sectional view before welding in an embodiment of a portion indicated by a circle C in FIG. 5;
【図７】図５の丸Ｃで示す部分の他の態様例における溶
接前の拡大断面図である。FIG. 7 is an enlarged cross-sectional view of another portion of a portion indicated by a circle C in FIG. 5 before welding.
【図８】図５の丸Ｃで示す部分の他の態様例における溶
接前の拡大断面図である。FIG. 8 is an enlarged cross-sectional view before welding in another example of a portion indicated by a circle C in FIG. 5;
【図９】図７の溶接後の拡大断面図である。FIG. 9 is an enlarged sectional view after welding of FIG. 7;
【図１０】図８の溶接後の拡大断面図である。FIG. 10 is an enlarged sectional view after welding of FIG. 8;
１ 電池缶 １４ 電池缶の開口上端面 ６ 電池蓋 ６１１ 電池蓋の溶接面 ６１３ 電池蓋のダレ部 ６１４ 電池蓋の最先端面 ６１５ 電池蓋の先端部分 Ｇ 電池缶と電池蓋との合わせ部 Ｇ１ 合わせ部の外側端 ＬＤ レーザー光 DESCRIPTION OF SYMBOLS 1 Battery can 14 Upper end face of opening of battery can 6 Battery lid 611 Welding surface of battery lid 613 Dripping part of battery lid 614 Leading edge of battery lid 615 Tip part of battery lid G Joint part of battery can and battery lid G1 Outside edge LD laser light
───────────────────────────────────────────────────── フロントページの続き (72)発明者 丸本 光弘 兵庫県伊丹市池尻４丁目３番地 三菱電線 工業株式会社伊丹製作所内 Ｆターム(参考） 4E068 AA02 BD00 CA08 DA09 DB04 5H011 AA09 AA17 CC06 DD03 DD13 KK00 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Mitsuhiro Marumoto 4-3 Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Cable Industry Co., Ltd. Itami Works F-term (reference) 4E068 AA02 BD00 CA08 DA09 DB04 5H011 AA09 AA17 CC06 DD03 DD13 KK00
Claims (5)
する際、電池蓋として電池缶の開口面積より大きい面積
を有し、このために電池缶の開口上端面と外壁面との稜
線を越えて存在する先端部分を有するものを用い、該先
端部分の少なくとも一部が溶融してその溶融体の少なく
とも一部にて上記溶接所要個所の間隙が充填されるよう
にレーザー光を照射することを特徴とする密閉型電池の
製造方法。When welding a required portion between a battery lid and a battery can, the battery lid has an area larger than an opening area of the battery can, and therefore, a ridge line between an upper end surface of the opening of the battery can and an outer wall surface. A laser beam is applied so that at least a part of the tip part is melted and at least a part of the melt fills the gap at the required welding point. A method for producing a sealed battery.
レス加工にて成形されて電池缶の開口上端面上に合わせ
得る溶接面と、電池缶の内壁面と接し得る位置合わせ面
とを有する段構造を呈し、且つ溶接所要個所が電池蓋の
溶接面と電池缶の開口上端面との合わせ部である請求項
１記載の密閉型電池の製造方法。2. The battery lid has a welded surface whose end including a tip portion is formed by press working so as to be aligned with an upper end surface of an opening of the battery can, and a positioning surface which can be in contact with an inner wall surface of the battery can. 2. The method for producing a sealed battery according to claim 1, wherein the stepped portion has a step structure, and a welding required portion is a joint portion between a welding surface of the battery lid and an upper end surface of the opening of the battery can.
と外壁面との稜線を越えて折れ曲がって電池缶の外壁面
上に至っており、且つ溶接所要個所が電池蓋の先端部分
と電池缶の外壁面との合わせ部である請求項１記載の密
閉型電池の製造方法。3. A front end portion of the battery lid is bent beyond an edge line between an upper end surface of the opening of the battery can and an outer wall surface to reach an outer wall surface of the battery can, and a required welding portion is formed between the front end portion of the battery lid and the battery. The method for producing a sealed battery according to claim 1, wherein the sealed portion is a joint portion with an outer wall surface of the can.
池缶の外壁面に対して１２０度未満の角度で照射する請
求項１〜３のいずれかに記載の密閉型電池の製造方法。4. The method for manufacturing a sealed battery according to claim 1, wherein a laser beam is applied to an outer end of the required welding point at an angle of less than 120 degrees to an outer wall surface of the battery can.
合金にて形成されてなる請求項１〜４のいずれかに記載
の密閉型電池の製造方法。5. The method for manufacturing a sealed battery according to claim 1, wherein the battery can and the battery lid are both formed of an aluminum-based alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10190708A JP2000021365A (en) | 1998-07-06 | 1998-07-06 | Manufacture of sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10190708A JP2000021365A (en) | 1998-07-06 | 1998-07-06 | Manufacture of sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000021365A true JP2000021365A (en) | 2000-01-21 |
Family
ID=16262523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10190708A Pending JP2000021365A (en) | 1998-07-06 | 1998-07-06 | Manufacture of sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000021365A (en) |
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