JPH07272701A - Sealing method for sealed battery and sealed battery - Google Patents
Sealing method for sealed battery and sealed batteryInfo
- Publication number
- JPH07272701A JPH07272701A JP6064016A JP6401694A JPH07272701A JP H07272701 A JPH07272701 A JP H07272701A JP 6064016 A JP6064016 A JP 6064016A JP 6401694 A JP6401694 A JP 6401694A JP H07272701 A JPH07272701 A JP H07272701A
- Authority
- JP
- Japan
- Prior art keywords
- sealing
- battery
- sealing plate
- packing
- sealed battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属性の電池外装缶と
封口板とをレーザ溶接によって封止する密閉型電池の製
法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a sealed battery in which a metallic battery outer can and a sealing plate are sealed by laser welding.
【０００２】[0002]
【従来の技術】ニカド電池、リチウム電池等の密閉型電
池の構造は、例えば、図５に示すように正極、負極及び
セパレータからなる電極群が格納される外装缶１０１の
開口部が、封口板１０２、パッキン１０３及びこのパッ
キン１０３によって封口板１０２に固定されている正極
端子１０４を有する封口体１０５によって、封口密閉さ
れた構造である。2. Description of the Related Art As shown in FIG. 5, the structure of a sealed battery such as a nickel-cadmium battery or a lithium battery is such that an opening of an outer can 101 in which an electrode group including a positive electrode, a negative electrode and a separator is stored is a sealing plate. The structure is hermetically sealed by a sealing body 105 having 102, a packing 103, and a positive electrode terminal 104 fixed to the sealing plate 102 by the packing 103.
【０００３】このような電池の封口は、図７に示すよう
に、外装缶１０１の開口部端部１０１ａと封口板１０２
の上面１０２ａとを面一にした状態で、上方からレーザ
ー光を照射して外装缶１０１と封口板１０２とを溶接す
ることにより行なっていた。しかしながら、このレーザ
溶接による封口を行なうと、以下のような現象が起こ
る。 近年、電池の小型化、薄型化が進み、溶接部分とパ
ッキン部分との距離が大変短くなっている。このような
状態で、封口体と外装缶とのレーザ溶接を行なうと、誤
って、レーザ光が直接パッキンに照射されてしまうこと
がある。 に示したように、溶接部とパッキンとの距離が短
いため、溶接部から溶接の際に発生した熱が伝導し、パ
ッキンが加熱されてしまう。 溶接に用いるレーザ光の反射光がパッキンに照射さ
れてしまう。As shown in FIG. 7, such a battery is sealed with an opening end 101a of an outer can 101 and a sealing plate 102.
In the state where the upper surface 102a is flush with the upper surface 102a, the outer can 101 and the sealing plate 102 are welded by irradiating laser light from above. However, when the sealing is performed by the laser welding, the following phenomenon occurs. In recent years, batteries have become smaller and thinner, and the distance between the welding part and the packing part has become very short. If the sealing body and the outer can are laser-welded in such a state, the packing may be directly irradiated with laser light by mistake. Since the distance between the welding portion and the packing is short as shown in FIG. 3, heat generated during welding is conducted from the welding portion and the packing is heated. The packing is irradiated with the reflected light of the laser light used for welding.
【０００４】上記〜のようなことが起こると、パッ
キンの焼け、即ちパッキンの溶融や硬化が生じ、以下の
ような問題が起こる。上記パッキンの焼けは、直接焼け
た部分だけでなく電池内部側にも進行するので、パッキ
ンがパッキンとしての用を足さなくなってしまい、電池
の気密性が著しく低下する。このため、電池の保存を行
なっているうちに電解液のリークが生じ、電池寿命を低
下させてしまう。When the above items (1) to (4) occur, the packing is burnt, that is, the packing is melted or hardened, and the following problems occur. The burning of the packing proceeds not only to the directly burned portion but also to the inside of the battery, so that the packing is no longer useful as a packing and the airtightness of the battery is significantly reduced. As a result, the electrolyte leaks during storage of the battery, which shortens the battery life.
【０００５】また、パッキンの焼けが起こる際にはガス
が発生し、このガスがレーザ溶接を行なっている部分に
存在するようになる。通常レーザ溶接時には、封口板や
外装管の溶融する部分の酸化を防ぐため、溶融する部分
を不活性ガス雰囲気になるようにしていが、このガスが
溶融部に存在することにより、溶融部分が不活性な雰囲
気下でなくなってしまい溶融部分の酸化が起こりやすく
なる。さらに、理由は明らかではないが、パッキンの焼
けにより発生したガスが溶接部に存在すると、不活性ガ
スのみが存在する場合と比較して溶融する深さが浅くな
り、ピンホールの原因になってしまう。Further, when the packing burns, gas is generated, and this gas comes to exist in the portion where laser welding is performed. Normally, during laser welding, the melted part is kept in an inert gas atmosphere in order to prevent oxidation of the melted part of the sealing plate and the outer tube. It disappears under an active atmosphere, and oxidation of the melted portion easily occurs. Furthermore, although the reason is not clear, if the gas generated by the burning of the packing is present in the weld, the depth of melting will be shallower than in the case where only the inert gas is present, causing a pinhole. I will end up.
【０００６】そこで、従来では、パッキンの焼け防止の
対策として、レーザ起動を外側にずらす或いはレーザの
出力を下げるといった方法が行なわれていた。Therefore, conventionally, as a measure for preventing the burning of the packing, a method of shifting the laser start to the outside or lowering the laser output has been used.
【０００７】[0007]
【発明が解決しようとする問題点】しかしながら上記方
法では、上記、の問題は解決できるが、レーザの反
射光によるパッキンの焼けについては、解決できなかっ
た。これは、レーザ光の反射が、レーザ軌道や出力に関
係なく以下のようにして起こるからである。However, although the above-mentioned problems can be solved by the above method, the burning of the packing due to the reflected light of the laser cannot be solved. This is because the reflection of laser light occurs as follows regardless of the laser orbit and output.
【０００８】図８に示すように、加工レンズを通過し、
溶接部にレーザ光（実線で示す）が照射されると、溶融
部分１１０は、丸く盛り上がった状態になり、特に封口
板１０１上の溶融部分は、パッキン１０３側に面した球
面となる。このパッキン１０３側に面した球面に照射さ
れたレーザ光は、破線で示すようにパッキン１０３方向
に反射してしまう。As shown in FIG. 8, after passing through the processed lens,
When the welded portion is irradiated with laser light (shown by a solid line), the melted portion 110 is in a rounded and raised state, and particularly the melted portion on the sealing plate 101 becomes a spherical surface facing the packing 103 side. The laser light applied to the spherical surface facing the packing 103 side is reflected in the packing 103 direction as indicated by the broken line.
【０００９】本発明は上記問題点に鑑み行なわれたもの
であり、信頼性が高く、長寿命な密閉型電池とその封口
方法を提供することを目的とする。The present invention has been made in view of the above problems, and an object of the present invention is to provide a sealed battery having high reliability and long life, and a method for sealing the same.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、本発明は、正極と負極とセパレータとからなる電極
群が収納された外装缶とこの外装缶を封口する封口体を
有し、さらにこの封口体が外装缶と直接溶接される封口
板と、この封口板にパッキンを介して固定される密閉体
とを有する密閉式電池の封口方法において、上記外装缶
の開口部上端面より、封口板の外部露出側主表面が高く
なるように、封口体を外装缶開口部に装着する第１のス
テップと、第１のステップにより装着された外装缶と封
口体との接触部及びその周辺を上方からレーザ光を照射
することにより溶接する第２のステップとを有すること
を特徴とする。In order to achieve the above object, the present invention has an outer can containing an electrode group consisting of a positive electrode, a negative electrode and a separator, and a sealing body for sealing the outer can. Further, in the method of sealing a sealed battery, wherein the sealing body has a sealing plate directly welded to the outer can, and a sealing body fixed to the sealing plate via packing, from the upper end surface of the opening of the outer can, The first step of mounting the sealing body on the outer can opening so that the main surface of the sealing plate on the externally exposed side becomes high, and the contact portion between the outer can and the sealing body mounted by the first step and the vicinity thereof. Is welded by irradiating a laser beam from above.
【００１１】また、上記第１ステップにおいて、封口体
を外装缶開口部に装着する際に、上記外装缶の開口部上
端面より、封口板の外部露出側主表面が０．１ｍｍ〜
０．３ｍｍ高く成るようにすることを特徴とする請求項
１記載の密閉式電池の封口方法。また、正極と負極とセ
パレータとからなる電極群が収納された外装缶とこの外
装缶を封口する封口体を有し、さらにこの封口体が外装
缶と直接溶接される封口板と、この封口板にパッキンを
介して固定される密閉体とを有する密閉式電池におい
て、上記封口板の外装缶側端部と上部外装缶の開口部と
が溶着されおり、この溶着部分の外部露出面が、封口板
から外装缶に向かい下った傾斜を有する斜面であること
を特徴とする。In addition, in the first step, when the sealing body is attached to the opening of the outer can, the outer surface of the outer side of the sealing plate from the upper end surface of the opening of the outer can is 0.1 mm to 0.1 mm.
The method for sealing a sealed battery according to claim 1, wherein the height is set to be 0.3 mm higher. In addition, an outer can containing an electrode group consisting of a positive electrode, a negative electrode, and a separator, and a sealing body for sealing the outer can, and further, the sealing plate directly welded to the outer can, and the sealing plate. In a sealed battery having a sealing body fixed via a packing, the end of the sealing plate on the outer can side and the opening of the upper outer can are welded, and the externally exposed surface of the welded part is the sealing. It is characterized in that it is a slope having a slope downward from the plate toward the outer can.
【００１２】また、上記密閉式電池の外装缶が角形であ
ることを特徴とする。さらに、上記密閉式電池の上記外
装缶がアルミニウム又はその合金であることを特徴とす
る。Further, the outer can of the sealed battery is rectangular. Further, the outer can of the sealed battery is made of aluminum or its alloy.
【００１３】[0013]
【作用】上記のような構成により以下のような作用が得
られる。レーザ光の反射は、レーザ光が照射された点の
接線の法線とレーザ光とがなす角度と当該法線と反射光
とがなす角度が等しく、しかも反射光がレーザ光と法線
とを含む平面上にあるような方向に起こる。The following effects can be obtained by the above structure. The reflection of the laser light is such that the angle formed by the laser beam and the normal line of the tangent to the point irradiated with the laser beam is equal to the angle formed by the normal line and the reflected light, and the reflected light is the laser beam and the normal line. Occurs in a direction that is on the containing plane.
【００１４】レーザ溶接法を用いて、電池を封口する
際、図４（ａ）に示すように封口板９の外部露出側主表
面を外装缶１の開口部上端より上に位置させ、実線矢印
で示すようにレーザ光を照射すると、溶融部Ａは、図４
（ｂ）のように封口板９から外装缶１に掛けて下った球
面からなる傾斜面となる。この溶融部Ａの傾斜面はパッ
キン１０方向には面していない、従ってこの面にレーザ
光の照射された点の法線もパッキン１０方向には向かわ
ず、上方からレーザ光が照射された場合、レーザ光の反
射光は、パッキン１０とは逆方向に向かって起こること
になる。When the battery is sealed using the laser welding method, as shown in FIG. 4 (a), the main surface of the sealing plate 9 on the externally exposed side is positioned above the upper end of the opening of the outer can 1, and the solid line arrow When irradiated with laser light as shown in FIG.
As shown in (b), the inclined surface is a spherical surface that hangs from the sealing plate 9 to the outer can 1. When the inclined surface of the fusion zone A does not face the packing 10 direction, the normal line of the point on which the laser light is irradiated does not face the packing 10 direction, and the laser light is irradiated from above. The reflected light of the laser light is generated in the direction opposite to the packing 10.
【００１５】[0015]
【実施例】図１は本発明の一例を示す密閉式角形電池の
斜視図（一部断面）であり、図２は本発明の一例を示す
密閉式角形電池の上面図であり、図３は図２の電池のII
I− III断面図である。本発明の密閉式角形電池は、内
部にセパレータと、正極と、負極とからなる電極群（図
示せず）が設けられた外装缶１と当該外装缶１の開口部
を封口する封口体２とを有している。FIG. 1 is a perspective view (partially sectional view) of a sealed prismatic battery showing an example of the present invention, FIG. 2 is a top view of a sealed prismatic battery showing an example of the present invention, and FIG. II of the battery in Figure 2
It is an I-III sectional view. The sealed prismatic battery of the present invention includes an outer can 1 in which an electrode group (not shown) including a separator, a positive electrode, and a negative electrode is provided, and a sealing body 2 for sealing the opening of the outer can 1. have.
【００１６】外装缶１内に配置される電極群の正極は接
続部材３を介して集電板４に接続されている。また、電
極群の負極は負極兼用の外装缶１と直接接触することに
よって電気的に接続されている。ここで前記封口体２
は、図３に示すように、封口板５と断面コ字状の中空の
パッキン６と、断面Ｔ字状の正極端子７と、中空のワッ
シャー８と、集電板４とを有している。The positive electrode of the electrode group arranged in the outer can 1 is connected to the collector plate 4 via the connecting member 3. The negative electrode of the electrode group is electrically connected by directly contacting the outer can 1 that also serves as the negative electrode. Here, the sealing body 2
As shown in FIG. 3, has a sealing plate 5, a hollow packing 6 having a U-shaped cross section, a positive electrode terminal 7 having a T-shaped cross section, a hollow washer 8, and a current collector plate 4. .
【００１７】上記封口板５の電池中心側端部５ａと、断
面コ字状中空のパッキン６の凹部６ａとは嵌合されてお
り、このパッキン６の上部には中空のワッシャー８が設
けられ、電池内部側下方には、集電板４が設けられてい
る。さらに、正極端子７は、パッキン６との間に集電板
４を介した状態で、凸部７ａがパッキン６の中空部分及
びワッシャー８の中空部分に嵌挿されており、この断面
Ｔ字状正極端子７と、ワッシャー８によって、パッキン
６と、封口板５と、集電板４とは上下方向から締め付け
られている。The end 5a on the battery center side of the sealing plate 5 and the recess 6a of the packing 6 having a U-shaped cross section are fitted to each other, and a hollow washer 8 is provided on the top of the packing 6. A current collector plate 4 is provided below the inside of the battery. Further, in the positive electrode terminal 7, the convex portion 7a is fitted and inserted in the hollow portion of the packing 6 and the hollow portion of the washer 8 with the current collector plate 4 interposed between the positive electrode terminal 7 and the packing 6, and this positive electrode terminal 7 has a T-shaped cross section. The packing 6, the sealing plate 5, and the current collector plate 4 are fastened by the positive electrode terminal 7 and the washer 8 from above and below.
【００１８】また、上記封口板５の外装缶側端部と外装
缶１の開口部上端とはレーザー溶接されており、その溶
接部分９は、封口板５から外装缶１方向に下る傾斜面に
なっている。このように構成された密閉式角形電池は、
以下のようにして作成した。先ず、正極とセパレータと
負極とからなる電極群を作成する。次に、所定の手順
で、封口板５と断面コ字状の中空のパッキン６と、断面
Ｔ字上の正極端子７と、ワッシャー８と、集電板４とを
組み合わせ封口体２を作製する。上記電極群を外装缶１
内に挿入し、電極群の正極と封口体２の集電板４とを接
続部材３を用いて電気的に接続する。続いて、外装缶１
内に電解液を注入し、封口体２を外装缶１に圧入する。
この圧入の際、図４（ａ）に示すように、封口板５の電
池外部主表面５ａが外装缶１開口部上端１ａより０．１
ｍｍ上に位置するように封口体２を外装缶１に配する。The end of the sealing plate 5 on the side of the outer can and the upper end of the opening of the outer can 1 are laser-welded, and the welded portion 9 is an inclined surface descending from the sealing plate 5 in the direction of the outer can 1. Has become. The sealed prismatic battery configured in this way is
It was created as follows. First, an electrode group including a positive electrode, a separator, and a negative electrode is created. Next, according to a predetermined procedure, the sealing plate 5, the hollow packing 6 having a U-shaped cross section, the positive electrode terminal 7 having a T-shaped cross section, the washer 8, and the current collector 4 are combined to produce the sealing body 2. . Put the above electrode group in the outer can 1
Then, the positive electrode of the electrode group and the current collector plate 4 of the sealing body 2 are electrically connected using the connecting member 3. Then, the outer can 1
The electrolytic solution is injected into the inside, and the sealing body 2 is press-fitted into the outer can 1.
At the time of this press-fitting, as shown in FIG. 4 (a), the battery outer main surface 5 a of the sealing plate 5 is 0.1 from the upper end 1 a of the opening of the outer can 1.
The sealing body 2 is placed on the outer can 1 so as to be positioned above mm.
【００１９】さらに、封口板５と外装缶１とが接した部
分に上方から加工レンズを通過させたレーザー光を照射
させ、レーザ溶接を行なう。このレーザ溶接の際、レー
ザ光を照射すると、封口板５と外装缶１とは溶融し、そ
の溶融部Ａは、図４（ｂ）封口板５から外装缶１に掛け
て下った球面からなる傾斜面となる。この面に照射され
たレーザ光（実線で示す）の照射点の法線は、パッキン
６方向には向かわず、上方からレーザ光が照射された場
合は、その反射光（破線で示す）もパッキン６とは反対
の方向に反射する。Further, the portion where the sealing plate 5 and the outer can 1 are in contact with each other is irradiated with the laser beam that has passed through the processing lens from above to perform laser welding. When laser light is irradiated during this laser welding, the sealing plate 5 and the outer can 1 are melted, and the melting portion A is a spherical surface hanging from the sealing plate 5 to the outer can 1 as shown in FIG. 4B. It becomes an inclined surface. The normal line of the irradiation point of the laser light (shown by the solid line) irradiated on this surface does not face the packing 6 direction, and when the laser light is irradiated from above, the reflected light (shown by the broken line) of the packing is also packed. It reflects in the direction opposite to 6.
【００２０】このように作成された電池を以下（Ａ）電
池と称する。 （比較例）図５に示すように、封口板１０２の上面１０
２ａとが外装缶１０１の開口部上端１０１ａとを面１に
した以外は、上記実施例１と同様に電池を作製した。こ
のように作成された電池を、以下（Ｘ）電池と称する。 （実験１）本実施例の（Ａ）電池と、比較例の（Ｘ）電
池とを用いて、溶接部分のピンホール発生率と、保存後
の電解液のリーク発生率とを調べたので、下記の表１に
示す。The battery thus prepared is hereinafter referred to as (A) battery. (Comparative Example) As shown in FIG. 5, the upper surface 10 of the sealing plate 102.
A battery was prepared in the same manner as in Example 1 except that the surface 2 a and the upper end 101 a of the opening of the outer can 101 were used as the surface 1. The battery thus prepared is hereinafter referred to as (X) battery. (Experiment 1) Using the battery (A) of the present example and the battery (X) of the comparative example, the pinhole occurrence rate at the welded portion and the electrolyte leak occurrence rate after storage were examined. It is shown in Table 1 below.
【００２１】尚、実験は、以下のようにして行なった。 〔ピンホール発生率〕本発明の（Ａ）電池、比較例の
（Ｘ）電池それぞれ５０個づつ用意し、拡大鏡（×２
０）で、溶接部の観察を行い溶接部ピンホール発生が見
られた電池の個数を調べて、ピンホール発生率を算出し
た。 〔電解液リーク発生率〕ピンホール検査後、良品のみを
本発明の（Ａ）電池、比較例の（Ｘ）電池それぞれ５０
個づつ用意し、これらの電池を、６０℃で１ヵ月保存し
た後にパッキンからの電解液リークが発生した電池の個
数を調べ、電解液リーク発生率を算出した。The experiment was conducted as follows. [Pinhole Occurrence Rate] Prepare 50 batteries each of the battery (A) of the present invention and the battery (X) of the comparative example, and use a magnifying glass (× 2).
In 0), the welded portion was observed and the number of batteries in which the welded portion pinhole was found was checked to calculate the pinhole generation rate. [Electrolyte Leakage Occurrence Rate] After the pinhole inspection, only good products were 50 (A) battery of the present invention and 50 (X) battery of the comparative example.
The batteries were prepared one by one, and after storing these batteries at 60 ° C. for one month, the number of the batteries in which the electrolytic solution leaked from the packing was examined, and the electrolytic solution leak occurrence rate was calculated.
【００２２】[0022]
【表１】 [Table 1]
【００２３】表１から明らかなように本発明の（Ａ）電
池は、電解液リーク発生率、ピンホール発生率いずれも
低く、信頼性の高い電池が作製できた。次に、封口板の
上面と、外装缶開口部上端の段差の範囲を調べるため、
以下のような実験を行なった。 （実験２）本発明の（Ａ）電池の外装缶と封口板との段
差を０．０５〜０．４ｍｍの範囲で変化させた場合の、
ピンホール発生率、保存後の電解液リーク発生率と、調
べたので、その結果を図６に示す。尚、段差が０ｍｍ即
ち比較例の（Ｘ）電池の結果についてもあわせて再度表
示した。As is clear from Table 1, the battery (A) of the present invention has a low electrolyte leak occurrence rate and a low pinhole occurrence rate, and a highly reliable battery can be manufactured. Next, in order to check the upper surface of the sealing plate and the range of the step between the upper end of the outer can opening,
The following experiment was conducted. (Experiment 2) When the step difference between the outer can of the battery (A) of the present invention and the sealing plate was changed in the range of 0.05 to 0.4 mm,
The pinhole generation rate and the electrolyte leakage generation rate after storage were examined, and the results are shown in FIG. In addition, the step difference of 0 mm, that is, the result of the (X) battery of the comparative example is also shown again.
【００２４】尚実験条件としては、上記実験１と同様に
行なった。図６に示すように、段差を０．１ｍｍより小
さくすると、保存後の電解液リーク発生率が多くなっ
た。これは、段差が小さすぎるため、従来の溶接方法の
ように封口板の上面と外装缶の端部とを面一にした場合
と殆ど変わりなくなってしまい、パッキン方向に向かう
レーザ反射光が多くなってしまったためであると考えら
れる。The experimental conditions were the same as in Experiment 1 above. As shown in FIG. 6, when the step was smaller than 0.1 mm, the electrolytic solution leak occurrence rate after storage increased. This is almost the same as when the upper surface of the sealing plate and the end of the outer can are flush with each other as in the conventional welding method because the step is too small, and the laser reflected light toward the packing direction increases. It is thought that it is because it has gone.
【００２５】また、ピンホール発生については、０．３
５ｍｍ以上でピンホール発生率が多くなった。これは、
外装缶と封口板の段差が大き過ぎるため、溶接の際のお
互いの溶け込み不足が生じたためであると考える。以上
のような結果から、０．１〜０．３ｍｍのギャップを設
けた時最適なレーザ溶接が行なうことができることが明
らかになった。 （その他の事項） 上記実施例では、角形の密閉型の電池について記載
を行なったが、これに限ることはなく、円形、或いは非
真円形どのような形状の電池にでも用いることができ
る。 上記実施例では、外装缶、封口板の材質は規定して
いないが、アルミニウムやアルミニウムの合金を用いる
場合、従来の方法でレーザ溶接を行なうと特に反射率が
高いので、レーザ反射による焼けの影響も大きかった。
従って、従来の方法に代えて本発明を行うことによりそ
の効果は大になる。 上記実施例で示したような角形の密閉型の電池は、
円筒形の電池と比べて、電池を使用する機器に収納する
際に、収納スペースの無駄が省けるという利点を有して
いる。Regarding the occurrence of pinholes, 0.3
The pinhole generation rate increased when the thickness was 5 mm or more. this is,
It is considered that this is because the step difference between the outer can and the sealing plate was too large, resulting in insufficient melting of each other during welding. From the above results, it became clear that optimum laser welding can be performed when a gap of 0.1 to 0.3 mm is provided. (Other Matters) In the above embodiments, the description was given of the prismatic closed type battery, but the invention is not limited to this, and the battery can be used in any shape such as a circular shape or a non-round shape. In the above embodiment, the material of the outer can and the sealing plate is not specified, but when aluminum or an aluminum alloy is used, the reflectance is particularly high when laser welding is performed by the conventional method, and therefore the influence of burning due to laser reflection Was also great.
Therefore, by carrying out the present invention instead of the conventional method, the effect becomes large. The prismatic closed type battery as shown in the above embodiment,
Compared with a cylindrical battery, there is an advantage that the storage space can be saved when the battery is stored in a device that uses the battery.
【００２６】[0026]
【発明の効果】以上説明したように、本発明の封口方法
によれば、電池封口のためのレーザ溶接時の、パッキン
方向へのレーザ反射光の発生が防止され、レーザ反射光
によるパッキンの焼けを防止することができる。これに
より、溶接部分のピンホールの発生、保存後の電解液リ
ークの発生を低く抑えることができ、信頼性の高い、長
寿命な密閉式電池を提供できるという効果を奏する。As described above, according to the sealing method of the present invention, the laser reflected light is prevented from being generated in the packing direction during the laser welding for sealing the battery, and the packing is burned by the laser reflected light. Can be prevented. As a result, it is possible to suppress the occurrence of pinholes in the welded portion and the occurrence of electrolyte leakage after storage, and it is possible to provide a highly reliable and long-life sealed battery.
【図１】本発明の一例にかかる密閉式電池の斜視図であ
る。FIG. 1 is a perspective view of a sealed battery according to an example of the present invention.
【図２】本発明の一例にかかる密閉式電池の上面図であ
る。FIG. 2 is a top view of a sealed battery according to an example of the present invention.
【図３】図２に示す密閉式電池の III−III 断面図であ
る。FIG. 3 is a sectional view taken along line III-III of the sealed battery shown in FIG.
【図４】本発明の一例に係る電池の封口体−外装缶のレ
ーザ溶接の過程を示す図である。FIG. 4 is a diagram showing a process of laser welding a sealing body-exterior can of a battery according to an example of the present invention.
【図５】従来の密閉式電池の断面図である。FIG. 5 is a cross-sectional view of a conventional sealed battery.
【図６】不良発生率のグラフである。FIG. 6 is a graph of a defect occurrence rate.
【図７】従来の密閉式電池を示す図である。FIG. 7 is a diagram showing a conventional sealed battery.
【図８】従来の電池の電池のレーザ溶接時の様子を示す
図である。FIG. 8 is a diagram showing a state of laser welding of a battery of a conventional battery.
１ 外装缶 ２ 封口体 ５ 封口板 ６ パッキン 1 Exterior can 2 Sealing body 5 Sealing plate 6 Packing
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山内 康弘 守口市京阪本通２丁目５番５号 三洋電機 株式会社内 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Yasuhiro Yamauchi 2-5-5 Keihan Hondori, Moriguchi City Sanyo Electric Co., Ltd.
Claims (5)
群が収納された外装缶とこの外装缶を封口する封口体を
有し、さらにこの封口体が外装缶と直接溶接される封口
板と、この封口板にパッキンを介して固定される密閉体
とを有する密閉式電池の封口方法において、 上記外装缶の開口部上端面より、封口板の外部露出側主
表面が高くなるように、封口体を外装缶開口部に装着す
る第１のステップと、 第１のステップにより装着された外装缶と封口体との接
触部及びその周辺を上方からレーザ光を照射することに
より溶接する第２のステップとを有することを特徴とす
る密閉式電池の封口方法。1. An outer can containing an electrode group consisting of a positive electrode, a negative electrode, and a separator, and a sealing body for sealing the outer can, and a sealing plate for directly welding the sealing body to the outer can. In a method for sealing a sealed battery having a sealing body fixed to the sealing plate via a packing, a sealing body is provided such that a main surface of the sealing plate on the outside exposed side is higher than an upper end surface of an opening of the outer can. And a second step of welding the contact portion between the outer can and the sealing body mounted in the first step and the periphery thereof by irradiating a laser beam from above. A method for sealing a sealed battery, comprising:
装缶開口部に装着する際に、上記外装缶の開口部上端面
より、封口板の外部露出側主表面が０．１ｍｍ〜０．３
ｍｍ高く成るようにすることを特徴とする請求項１記載
の密閉式電池の封口方法。2. In the first step, when the sealing body is attached to the opening of the outer can, the outer surface of the outer side of the sealing plate is 0.1 mm to 0.3 mm from the upper end surface of the opening of the outer can.
The method for sealing a sealed battery according to claim 1, wherein the method is such that the height is increased by mm.
群が収納された外装缶とこの外装缶を封口する封口体を
有し、さらにこの封口体が外装缶と直接溶接される封口
板と、この封口板にパッキンを介して固定される密閉体
とを有する密閉式電池において、 上記封口板の外装缶側端部と上部外装缶の開口部とが溶
着されおり、この溶着部分の外部露出面が、封口板から
外装缶に向かい下った傾斜を有する斜面であることを特
徴とする密閉式電池。3. An outer can containing an electrode group consisting of a positive electrode, a negative electrode, and a separator, and a sealing body for sealing the outer can, and a sealing plate for directly welding the sealing body to the outer can. In a sealed battery having a sealing body fixed to the sealing plate via a packing, an end of the sealing plate on the outer can side and an opening of the upper outer can are welded together, and an externally exposed surface of the welded portion. Is a sloped surface having a slope from the sealing plate toward the outer can.
る請求項３記載の密閉式電池。4. The sealed battery according to claim 3, wherein the outer can has a rectangular shape.
であることを特徴とする請求項３記載の密閉式電池。5. The sealed battery according to claim 3, wherein the outer can is made of aluminum or its alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06401694A JP3454565B2 (en) | 1994-03-31 | 1994-03-31 | Sealing method of sealed battery and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06401694A JP3454565B2 (en) | 1994-03-31 | 1994-03-31 | Sealing method of sealed battery and battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07272701A true JPH07272701A (en) | 1995-10-20 |
| JP3454565B2 JP3454565B2 (en) | 2003-10-06 |
Family
ID=13245952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06401694A Expired - Fee Related JP3454565B2 (en) | 1994-03-31 | 1994-03-31 | Sealing method of sealed battery and battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3454565B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003051292A (en) * | 2001-08-08 | 2003-02-21 | Matsushita Electric Ind Co Ltd | Sealed battery and sealing plate thereof |
| CN100356613C (en) * | 2003-11-28 | 2007-12-19 | 松下电器产业株式会社 | Prismatic battery and manufacturing method thereof |
| JP2015111573A (en) * | 2014-12-22 | 2015-06-18 | トヨタ自動車株式会社 | Battery and manufacturing method thereof |
| CN106531907A (en) * | 2015-09-11 | 2017-03-22 | 丰田自动车株式会社 | Method of manufacturing secondary battery |
-
1994
- 1994-03-31 JP JP06401694A patent/JP3454565B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003051292A (en) * | 2001-08-08 | 2003-02-21 | Matsushita Electric Ind Co Ltd | Sealed battery and sealing plate thereof |
| CN100356613C (en) * | 2003-11-28 | 2007-12-19 | 松下电器产业株式会社 | Prismatic battery and manufacturing method thereof |
| US7601460B2 (en) | 2003-11-28 | 2009-10-13 | Panasonic Corporation | Prismatic battery and manufacturing method thereof |
| JP2015111573A (en) * | 2014-12-22 | 2015-06-18 | トヨタ自動車株式会社 | Battery and manufacturing method thereof |
| CN106531907A (en) * | 2015-09-11 | 2017-03-22 | 丰田自动车株式会社 | Method of manufacturing secondary battery |
| DE102016115437B4 (en) * | 2015-09-11 | 2017-12-07 | Toyota Jidosha Kabushiki Kaisha | Process for producing a secondary battery |
| CN106531907B (en) * | 2015-09-11 | 2019-05-14 | 丰田自动车株式会社 | The manufacturing method of secondary cell |
| US11094959B2 (en) | 2015-09-11 | 2021-08-17 | Toyota Jidosha Kabushiki Kaisha | Method of manufacturing secondary battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3454565B2 (en) | 2003-10-06 |
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