JP2937456B2 - Manufacturing method of cylindrical battery - Google Patents
Manufacturing method of cylindrical batteryInfo
- Publication number
- JP2937456B2 JP2937456B2 JP2285745A JP28574590A JP2937456B2 JP 2937456 B2 JP2937456 B2 JP 2937456B2 JP 2285745 A JP2285745 A JP 2285745A JP 28574590 A JP28574590 A JP 28574590A JP 2937456 B2 JP2937456 B2 JP 2937456B2
- Authority
- JP
- Japan
- Prior art keywords
- lead
- manufacturing
- electrode group
- hollow portion
- separator
- 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.)
- Expired - Fee Related
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
- Connection Of Batteries Or Terminals (AREA)
Description
【発明の詳細な説明】 ［発明の目的］ （産業上の利用分野） 本発明は円筒形電池の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a method for manufacturing a cylindrical battery.
（従来の技術） ニッケルカドミウム電池やリチウム電池等の円筒形電
池は、正負極をセパレータを介在して渦巻状に捲回した
電極群を収納することによって高容量化が図られてい
る。かかる円筒形電池は次のように製造されている。ま
ず、シート状の正負極間にセパレータを介在させ、これ
らを捲回軸を用いて渦巻状に捲回した電極群を作製す
る。つづいて、この電極群を外装缶内に収納すると共
に、該電極群の一方の電極から導出されたリードを前記
外装缶の底部内面に溶接し、かつ他方の電極から導出さ
れたリードを封口蓋に溶接する。次いで、電解液を前記
外装缶内に注入した後、該外装缶の開口部に前記封口蓋
を取り付けて封口することにより円筒形電池を製造す
る。(Prior Art) A cylindrical battery such as a nickel cadmium battery or a lithium battery has a high capacity by accommodating an electrode group in which positive and negative electrodes are spirally wound with a separator interposed therebetween. Such a cylindrical battery is manufactured as follows. First, an electrode group in which a separator is interposed between sheet-like positive and negative electrodes and these are spirally wound using a winding shaft is prepared. Subsequently, the electrode group is housed in an outer can, a lead derived from one electrode of the electrode group is welded to the inner surface at the bottom of the outer can, and a lead derived from the other electrode is sealed with a lid. To weld. Next, after injecting the electrolytic solution into the outer can, the sealing lid is attached to the opening of the outer can to seal the battery, thereby manufacturing a cylindrical battery.
ところで、前記リードと前記外装缶の底部内面との溶
接は、従来より溶接用電極棒を用いて行なわれている。
即ち、この方法は、前記電極群の作製後に前記捲回軸を
抜き取ることにより形成される中空部に前記溶接用電極
棒を挿入し、前記リードを前記外装缶の底部内面に抵抗
溶接するものである。By the way, welding of the lead and the inner surface of the bottom of the outer can has been conventionally performed using a welding electrode rod.
That is, this method inserts the welding electrode rod into a hollow portion formed by extracting the winding shaft after manufacturing the electrode group, and resistance-welds the lead to the bottom inner surface of the outer can. is there.
しかしながら、前記電極群の中空部は、容積効率を高
める観点から小さいことが望まれると共に捲回軸に充分
な強度を持たせるためにその直径の下限が規制されるこ
とから3mm径程度となることが多い。しかも、前記中空
部には捲回初めのセパレータが該中空部の径を二分する
ように横断している。これらのことから前記中空部に前
記溶接用電極棒を挿入するのが困難となる。更に、前記
電気群の中空部の位置が変動するため、製品毎に前記中
空部の位置を確認し、その位置に合わせて溶接用電極棒
を挿入する必要がある。However, the hollow portion of the electrode group is desired to be small from the viewpoint of increasing the volumetric efficiency, and has a diameter of about 3 mm because the lower limit of the diameter is regulated in order to have sufficient strength for the wound shaft. There are many. In addition, the separator at the beginning of winding crosses the hollow portion so as to bisect the diameter of the hollow portion. For these reasons, it becomes difficult to insert the welding electrode rod into the hollow portion. Further, since the position of the hollow portion of the electric group fluctuates, it is necessary to confirm the position of the hollow portion for each product and insert a welding electrode rod in accordance with the position.
このようなことから、前記電極群の中空部からレーザ
光或いは電子線を照射して前記リードを外装缶の底部内
面に溶接する方法が提案されている（特公平２−15985
号）。かかる方法によれば、前記溶接用電極棒の挿入性
の問題は解消される。For this reason, there has been proposed a method of irradiating a laser beam or an electron beam from the hollow portion of the electrode group to weld the lead to the inner surface of the bottom of the outer can (Japanese Patent Publication No. 2-15985).
issue). According to this method, the problem of insertability of the welding electrode rod is solved.
しかしながら、前記方法では、電極群の中空部の位置
が変動するため、製品毎に前記中空部の位置を検出し、
その位置に合わせてレーザ光或いは電子線を照射する必
要がある。しかも、前記中空内部に横断しているセパレ
ータを溶断する必要がある。セパレータを溶断するとい
うことは、レーザ光や電子線がセパレータにより部分的
に遮られることを意味する。また、セパレータを溶断す
れば燃焼ガスが発生するため、セパレータで遮られたレ
ーザ光や電子線は燃焼ガスによりさらに遮られ、弱めら
れる。その結果、照射光の強度にむらが生じ、溶接強度
に偏りを生じるため、溶接強度の強い箇所に電流が集中
し、大電流で放電すると電圧降下が著しくなり、大電流
放電特性が低下する。また、セパレータを溶断しながら
溶接するのは、作業性が劣る。更に、焦点を合わせて前
記レーザ光等を照射する場合、前記中空部が細長いこと
から前記レーザ光等の焦点距離を長くする必要があるた
め、溶接部の径（ナゲット径）が小さくなり、十分な溶
接強度が得られないという問題点がある。However, in the method, since the position of the hollow portion of the electrode group fluctuates, the position of the hollow portion is detected for each product,
It is necessary to irradiate a laser beam or an electron beam in accordance with the position. Moreover, it is necessary to melt the separator crossing the hollow interior. Fusing the separator means that the laser beam or the electron beam is partially blocked by the separator. Further, since the combustion gas is generated when the separator is blown, the laser beam and the electron beam blocked by the separator are further blocked and weakened by the combustion gas. As a result, the intensity of the irradiation light becomes uneven and the welding strength is deviated, so that the current is concentrated at a location where the welding strength is strong, and when a large current is discharged, the voltage drop becomes remarkable, and the large current discharge characteristics deteriorate. In addition, welding the separator while fusing it is inferior in workability. Further, when irradiating the laser light or the like with focus, it is necessary to increase the focal length of the laser light or the like because the hollow portion is elongated, so the diameter of the welded portion (nugget diameter) becomes small, There is a problem that high welding strength cannot be obtained.
（発明が解決しようとする課題） 本発明は従来の問題点を解決するためになられたもの
で、リードが外装缶の底部内面に良好に溶接された円筒
形電池を容易に製造し得る方法を提供しようとするもの
である。(Problems to be Solved by the Invention) The present invention has been made in order to solve the conventional problems, and a method for easily manufacturing a cylindrical battery in which a lead is well welded to the inner surface at the bottom of an outer can. It is intended to provide.
［発明の構成］ （課題を解決するための手段） 本発明は、正極と負極とをセパレータを介して渦巻状
に捲回することにより作製され、かつ径を二分するよう
に前記セパレータが横断している中空部を有する電極群
を外装缶内に収納すると共に、前記電極群のいずれか一
方の電極から導出されたリードを前記外装缶の底部内面
に接触するように配置する工程と、前記外装缶の底部外
面にレーザ光あるいは電子線を照射することにより前記
リードを前記外装缶の底部内面に溶接する工程とを具備
したことを特徴とする円筒形電池の製造方法である。[Constitution of the Invention] (Means for Solving the Problems) The present invention is manufactured by spirally winding a positive electrode and a negative electrode through a separator, and the separator traverses so as to divide the diameter into two. Accommodating an electrode group having a hollow portion in the outer can, and arranging a lead derived from any one of the electrodes of the electrode group so as to be in contact with a bottom inner surface of the outer can; Irradiating a laser beam or an electron beam to the outer surface of the bottom of the can to weld the lead to the inner surface of the bottom of the outer can.
本発明に係る製造方法において、前記レーザ光は、YA
Gレーザ発振器から発振されることが好ましい。In the manufacturing method according to the present invention, the laser light may be YA
Oscillation is preferably performed from a G laser oscillator.
また、前記外装缶は、前記リードが溶接される底部内
面と対向する底部外面に凹部が形成されていることが望
ましい。In addition, it is preferable that the outer can has a concave portion formed on an outer surface of the bottom opposite to an inner surface of the bottom to which the lead is welded.
また、前記外装缶内における前記電極群と前記リード
との間に絶縁板が配置されていることが好ましい。In addition, it is preferable that an insulating plate is disposed between the electrode group and the lead in the outer can.
前記外装缶としては、上方が開口した鉄等の金属製缶
が挙げられる。前記外装缶底部の前記リードが溶接され
る箇所（照射箇所）の厚さは、前記リードの厚さの1/2
〜２倍にするのが望ましい。この理由は、その厚さを1/
2倍未満にすると外装缶の強度が低下する恐れがあり、
一方その厚さが２倍を越えると前記リードとの溶接性が
低下する恐れがある。Examples of the outer can include a metal can made of iron or the like having an open top. The thickness (irradiation location) of the bottom of the outer can where the lead is welded is 1/2 of the thickness of the lead.
Desirably, it is up to twice. The reason is that its thickness is 1 /
If it is less than twice, the strength of the outer can may decrease,
On the other hand, if the thickness exceeds twice, the weldability with the lead may be reduced.
前記外装缶の内部底面に溶接されるリードは、例えば
ニッケル板等の金属板などからなる。前記リードの厚さ
は、0.05〜0.2mmにすることが望ましい。The lead welded to the inner bottom surface of the outer can is made of, for example, a metal plate such as a nickel plate. The thickness of the lead is desirably 0.05 to 0.2 mm.
（作用） 本発明の製造方法によれば、外装缶の底部外面にレー
ザ光あるいは電子線を照射して電極群のいずれか一方の
電極から導出されたリードを外装缶の底部内面に溶接す
ることによって、レーザ光あるいは電子線がセパレータ
や燃焼ガスのような障害物で遮られないため、照射光の
強度を均等にすることができる。その結果、リードと外
装缶底部内面との溶接強度を均一にすることができるた
め、接続箇所に電流を均等に流すことができ、大電流放
電時の電圧降下を抑制することができ、大電流放電容量
を向上することができる。(Function) According to the production method of the present invention, a lead derived from one of the electrodes of the electrode group is irradiated with a laser beam or an electron beam on the bottom outer surface of the outer can and welded to the inner surface of the bottom of the outer can. Accordingly, the laser light or the electron beam is not blocked by an obstacle such as a separator or a combustion gas, so that the intensity of the irradiation light can be made uniform. As a result, the welding strength between the lead and the inner surface of the bottom of the outer can can be made uniform, so that the current can flow evenly at the connection point, and the voltage drop at the time of large current discharge can be suppressed. Discharge capacity can be improved.
更に、従来のように電極群の中空部を通してレーザ光
等を照射する際のレーザ光等と中空部との厳密な位置合
わせ等が不要となるため、溶接を簡単に行なうことがで
きる。しかもレーザ等の焦点距離は、従来のようにレー
ザ光等が通過する中空部長さに規制されることなく、任
意に設定できるため、溶接部のナゲット径を大きくして
溶接強度を高めることができる。Further, since it is not necessary to strictly align the laser beam or the like with the hollow portion when irradiating the laser beam or the like through the hollow portion of the electrode group as in the related art, welding can be easily performed. Moreover, the focal length of the laser or the like can be arbitrarily set without being restricted by the length of the hollow portion through which the laser light or the like passes as in the conventional case. .
従って、前記リードが外装缶の底部内面に良好に溶接
された高信頼性の円筒形電池を容易に製造することがで
きる。Therefore, it is possible to easily manufacture a highly reliable cylindrical battery in which the lead is welded to the bottom inner surface of the outer can.
（実施例） 以下、本発明を円筒形リチウム電池の製造に適用した
例について図面を参照して詳細に説明する。(Example) Hereinafter, an example in which the present invention is applied to the manufacture of a cylindrical lithium battery will be described in detail with reference to the drawings.
実施例１ まず、第１図に示すように、二酸化マンガンを主活物
質とするシート状の正極１と金属リチウムからなるシー
ト状の負極２とをポリプロピレン製のマイクロポーラス
フィルムからなるセパレータ３を介して渦巻状に捲回
し、この捲回に用いた捲回軸を抜き取って中空部４を有
する電極群５を作製する。なお、前記電極群５の上側に
は、正極１から正極リード1aが導出されている。前記電
極群５の下側には、前記負極２の金属リチウムに一端が
圧着された厚さ0.1mmのニッケル板からなる負極リード2
aが導出されている。Example 1 First, as shown in FIG. 1, a sheet-shaped positive electrode 1 containing manganese dioxide as a main active material and a sheet-shaped negative electrode 2 made of metallic lithium were interposed through a separator 3 made of a polypropylene microporous film. To form a group of electrodes 5 having a hollow portion 4 by extracting the winding shaft used for this winding. A positive electrode lead 1a is led out of the positive electrode 1 above the electrode group 5. On the lower side of the electrode group 5, a negative electrode lead 2 made of a nickel plate having a thickness of 0.1 mm and one end of which is pressed against metallic lithium of the negative electrode 2 is provided.
a has been derived.
次いで、前記電極群５の底面に絶縁板６を配置し、前
記負極リード2aを前記絶縁板６の下面に沿って折り曲げ
た後、上方が開口した有底円筒形の外装缶７内に前記電
極群５等を、前記負極リード2aが該外装缶７底部の中心
部7aを横切るように収納する。なお、前記外装缶７は厚
さ0.3mmの鉄板からなり、前記負極リード2a先端付近が
接触される底部の中心部分7aがプレスにより厚さ0.15mm
に加工されている。（第２図図示）。Next, an insulating plate 6 is disposed on the bottom surface of the electrode group 5, and the negative electrode lead 2 a is bent along the lower surface of the insulating plate 6. The group 5 and the like are housed such that the negative electrode lead 2a crosses the center 7a at the bottom of the outer can 7. The outer can 7 is made of an iron plate having a thickness of 0.3 mm.
Has been processed. (Shown in FIG. 2).
次いで、第３図に示すように、YAGレーザ発振器８か
らレーザ光を発振させ、このレーザ光を直径0.6mmの光
ファイバ９に通じて凸レンズ10で集光して前記外装缶７
底部の中心部分7aに外側から照射することにより、前記
負極リード2aを外装缶７底部の中心部7aに５ジュールの
溶接エネルギーで溶接して固定する。この時、第４図に
示すように、前記凸レンズ９で集光されたレーザ光Ａを
照射することによりナゲット径ａの溶接がなされる。一
方、前記レーザ光Ａよりも焦点距離が短いレーザ光Ｂを
照射することにより、前記ナゲット径ａより拡大された
ナゲット径ｂの溶接がなされ、溶接強度を高めることが
できる。この後、前記正極リード1aを図示しない封口蓋
に溶接し、更に前記外装缶７内に電解液を注液した後、
前記封口蓋を前記外装缶７の上方開口部に取り付けて封
口することにより円筒形リチウム電池を製造する。Next, as shown in FIG. 3, a laser beam is oscillated from a YAG laser oscillator 8, and the laser beam passes through an optical fiber 9 having a diameter of 0.6 mm and is condensed by a convex lens 10 to form the outer can 7.
By irradiating the central portion 7a of the bottom from outside, the negative electrode lead 2a is fixed to the central portion 7a of the bottom of the outer can 7 by welding with a welding energy of 5 joules. At this time, as shown in FIG. 4, the laser beam A condensed by the convex lens 9 is irradiated to perform welding of the nugget diameter a. On the other hand, by irradiating the laser light B having a shorter focal length than the laser light A, welding with a nugget diameter b larger than the nugget diameter a is performed, and the welding strength can be increased. Thereafter, the positive electrode lead 1a was welded to a sealing lid (not shown), and an electrolyte was further injected into the outer can 7.
The sealing lid is attached to the upper opening of the outer can 7 and sealed to produce a cylindrical lithium battery.
上述した製造方法によれば、前記外装缶７の底部外面
にレーザ光を照射することにより前記負極リード2aを同
外装缶７の底部内面に溶接することができ、従来の電極
群の中空部を通してレーザ光を照射する方法のようなレ
ーザ光の位置合わせ操作が不要となるため、簡単かつ連
続的に円筒形リチウム電池を製造できる。According to the manufacturing method described above, the negative electrode lead 2a can be welded to the bottom inner surface of the outer can 7 by irradiating the outer surface of the bottom of the outer can 7 with a laser beam, and can be passed through the hollow portion of the conventional electrode group. Since there is no need for a laser light positioning operation such as a method of irradiating laser light, a cylindrical lithium battery can be manufactured simply and continuously.
なお、前記負極リード2aの溶接強度を調べるために、
溶接後に前記外装缶７内から前記電極群５を引き抜いた
ところ、前記負極リード2aが切断され、かつ該負極リー
ド2aの溶接部が外装缶７の底部内面に残存し、十分な溶
接強度を有することが確認できた。In order to check the welding strength of the negative electrode lead 2a,
When the electrode group 5 is pulled out from the inside of the outer can 7 after welding, the negative electrode lead 2a is cut, and a welded portion of the negative electrode lead 2a remains on the inner surface of the bottom of the outer can 7 and has sufficient welding strength. That was confirmed.
また、前記レーザ光に代えて電子線を照射した場合で
も前記負極リード2aを前記外装缶７の底部内面に良好に
溶接できた。Further, even when the electron beam was irradiated instead of the laser beam, the negative electrode lead 2a was successfully welded to the inner surface of the bottom of the outer can 7.
［発明の効果］ 以上詳述した如く、本発明によればリードが外装缶の
底部内面に良好に溶接された円筒形電池を容易に製造し
得る方法を提供することができる。[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide a method for easily manufacturing a cylindrical battery in which leads are well welded to the inner surface of the bottom of the outer can.
第１図〜第３図は実施例１の筒形リチウム電池の製造工
程を示す断面図、第４図は第３図の溶接部の拡大断面図
である。 １……正極板、1a……正極リード、２……負極板、2a…
…負極リード、３……セパレータ、５……電極群、７…
…外装缶、7a……外装缶底部の中心部分、８……YAGレ
ーザ発振器、10……凸レンズ。1 to 3 are sectional views showing the steps of manufacturing the cylindrical lithium battery of Example 1, and FIG. 4 is an enlarged sectional view of the welded portion in FIG. 1. Positive electrode plate, 1a ... Positive electrode lead, 2 ... Negative electrode plate, 2a ...
... negative electrode lead, 3 ... separator, 5 ... electrode group, 7 ...
... Outer can, 7a ... Center part of the bottom of the outer can, 8 ... YAG laser oscillator, 10 ... Convex lens.
フロントページの続き (56)参考文献 特開 昭60−115153（ＪＰ，Ａ) 特開 平４−230953（ＪＰ，Ａ) 特開 昭61−176053（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) H01M 2/20 - 2/36 Continuation of the front page (56) References JP-A-60-115153 (JP, A) JP-A-4-230953 (JP, A) JP-A-61-176053 (JP, A) (58) Fields investigated (Int) .Cl. 6 , DB name) H01M 2/20-2/36
Claims (4)
に捲回することにより作製され、かつ径を二分するよう
に前記セパレータが横断している中空部を有する電極群
を外装缶内に収納すると共に、前記電極群のいずれか一
方の電極から導出されたリードを前記外装缶の底部内面
に接触するように配置する工程と、 前記外装缶の底部外面にレーザ光あるいは電子線を照射
することにより前記リードを前記外装缶の底部内面に溶
接する工程と を具備したことを特徴とする円筒形電池の製造方法。1. An electrode group having a hollow portion formed by spirally winding a positive electrode and a negative electrode through a separator and having a hollow portion traversing the separator so as to divide the diameter into two. Storing and placing a lead derived from one of the electrodes of the electrode group so as to be in contact with the inner surface of the bottom of the outer can; and irradiating a laser beam or an electron beam to the outer surface of the bottom of the outer can Welding the lead to the inner surface of the bottom of the outer can.
振されることを特徴とする請求項１記載の円筒形電池の
製造方法。2. The method for manufacturing a cylindrical battery according to claim 1, wherein said laser light is oscillated from a YAG laser oscillator.
部内面と対向する底部外面に凹部が形成されていること
を特徴とする請求項１記載の円筒形電池の製造方法。3. The method for manufacturing a cylindrical battery according to claim 1, wherein the outer can has a concave portion formed on an outer surface of the bottom opposite to an inner surface of the bottom to which the lead is welded.
ードとの間に絶縁板が配置されていることを特徴とする
請求項１記載の円筒形電池の製造方法。4. The method for manufacturing a cylindrical battery according to claim 1, wherein an insulating plate is disposed between the electrode group and the lead in the outer can.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2285745A JP2937456B2 (en) | 1990-10-25 | 1990-10-25 | Manufacturing method of cylindrical battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2285745A JP2937456B2 (en) | 1990-10-25 | 1990-10-25 | Manufacturing method of cylindrical battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04162351A JPH04162351A (en) | 1992-06-05 |
| JP2937456B2 true JP2937456B2 (en) | 1999-08-23 |
Family
ID=17695503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2285745A Expired - Fee Related JP2937456B2 (en) | 1990-10-25 | 1990-10-25 | Manufacturing method of cylindrical battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2937456B2 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| JPH04162351A (en) | 1992-06-05 |
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