JP2864175B2 - Prismatic sealed battery - Google Patents
Prismatic sealed batteryInfo
- Publication number
- JP2864175B2 JP2864175B2 JP3186024A JP18602491A JP2864175B2 JP 2864175 B2 JP2864175 B2 JP 2864175B2 JP 3186024 A JP3186024 A JP 3186024A JP 18602491 A JP18602491 A JP 18602491A JP 2864175 B2 JP2864175 B2 JP 2864175B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- battery case
- thickness
- rectangular battery
- sealed
- 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 - Lifetime
Links
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
- Sealing Battery Cases Or Jackets (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、角形密閉式電池、とく
に金属製の電池ケースに封口板を溶接して気密に密閉し
た角形密閉式電池に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed rectangular battery, and more particularly to a sealed rectangular battery which is hermetically sealed by welding a sealing plate to a metal battery case.
【０００２】[0002]
【従来の技術】近年、ＡＶ機器、通信機器等の電子電気
機器の小型化、軽量化が進み、これらの機器に使用する
小型で収納効率の良い電池の開発が要望されてきてい
る。このような状況のなかで、機器への収納効率の良い
角形密閉式電池の需要が急速に伸びている。その例を図
面を参照して説明する。2. Description of the Related Art In recent years, the size and weight of electronic and electric devices such as AV devices and communication devices have been reduced, and there has been a demand for the development of small and highly efficient batteries for use in these devices. Under such circumstances, demand for a prismatic sealed battery having high storage efficiency in equipment has been rapidly growing. An example will be described with reference to the drawings.
【０００３】図３において１は、正極板２と負極板３と
をセパレータ４を介して対向させて構成した極板群５を
挿入した角形電池ケース、６は上記角形電池ケース１を
密封する封口板で、その周縁部は角形電池ケース１の上
端開口縁部に溶接されている。そして、溶接機として
は、溶接部近くの絶縁パッキングおよび極板群などへの
熱の影響を少なくするため、微細加工に適したパルス式
ＹＡＧレーザー溶接機が多く用いられている。また、角
形電池ケースとしては、ニッケル鋼板を絞り加工と、し
ごき加工を用いて成型したものが一般に使用されてい
る。In FIG. 3, reference numeral 1 denotes a rectangular battery case into which an electrode plate group 5 composed of a positive electrode plate 2 and a negative electrode plate 3 opposed to each other with a separator 4 interposed therebetween, and 6 denotes a sealing for sealing the rectangular battery case 1. The periphery of the plate is welded to the opening edge of the upper end of the rectangular battery case 1. As a welding machine, a pulse-type YAG laser welding machine suitable for fine processing is often used in order to reduce the influence of heat on the insulating packing near the welded portion and the electrode plate group. As the prismatic battery case, a nickel steel plate formed by drawing and ironing is generally used.
【０００４】しかしこのような従来の構成では、図３に
示すように、過充電による電池内圧の上昇、充放電サイ
クル寿命中の極板群５の膨張などにより、図３（イ）の
厚みｔを有する角形電池ケース１が、図３（ロ）のよう
に、電池底面より電池総高さの１／２乃至１／３の高さ
位置ｈに最大膨張点７をもつような形で膨張し、その結
果図４に示すように、角形電池ケース１と封口板６の溶
接部８に引張り応力ａがかかることにより引張り応力割
れ部９が発生し、電解液が漏洩するに至るという問題が
あった。However, in such a conventional configuration, as shown in FIG. 3, the internal pressure of the battery increases due to overcharging, and the electrode plate group 5 expands during the life of the charge / discharge cycle. As shown in FIG. 3 (b), the rectangular battery case 1 expands in such a manner that it has a maximum expansion point 7 at a height h of 1/2 to 1/3 of the total battery height from the bottom of the battery. As a result, as shown in FIG. 4, there is a problem in that a tensile stress a is applied to the welded portion 8 of the rectangular battery case 1 and the sealing plate 6 to generate a tensile stress cracked portion 9 and the electrolyte leaks. Was.
【０００５】[0005]
【発明が解決しようとする課題】解決しようとする課題
は、極板群を挿入した角形電池ケースを封口板の溶接に
よって密封する角形密閉式電池において、角形電池ケー
スが膨らんで溶接部分に引張り応力割れ部が発生すると
いう点である。A problem to be solved is a rectangular sealed battery in which a rectangular battery case in which an electrode plate group is inserted is sealed by welding a sealing plate. The point is that cracks occur.
【０００６】[0006]
【課題を解決するための手段】本発明は、正極板と負極
板をセパレータを介して交互に積層してなる極板群を挿
入した角形電池ケースの開口部に封口板を嵌合し、この
嵌合部を溶接する角形密閉式電池において、極板群の積
層方向の対向する角形電池ケースの両側面に、底面より
電池総高さの１／２を上限とし１／３を下限とする範囲
の位置で、かつ角形電池ケースの厚み最大部の９０乃至
９７％となる厚み最小部を中心部として外周にゆくに従
って前記中心部よりは厚みが厚く前記角形電池ケースの
厚み最大部よりは薄く形成した曲面の緩やかな円形湾曲
状凹部を設けたものである。According to the present invention, a sealing plate is fitted into an opening of a rectangular battery case into which an electrode plate group in which a positive electrode plate and a negative electrode plate are alternately laminated via a separator is inserted. In a sealed rectangular battery in which a fitting portion is welded , a range in which the upper limit is ２ of the total battery height and the lower limit isよ りof the total battery height from the bottom surface on both side surfaces of the rectangular battery case opposed in the stacking direction of the electrode plate group. at the position and at the outer periphery with the minimum thickness portion being 90 to 97% of the maximum thickness portion of the prismatic battery case as the center.
Therefore, the thickness of the prismatic battery case is thicker than the central portion.
Slow circular curvature of curved surface formed thinner than maximum thickness
It is provided with a concave shape .
【０００７】[0007]
【作用】本発明によれば、過充電による電池内圧の上
昇、充放電サイクル寿命中の極板群の膨張などが発生し
ても、角形電池ケースは、膨張幅の最も大きい箇所を中
心にあらかじめ円形湾曲状凹部が形成されているために
電池ケースの厚みの最大部以上に膨張することがほとん
ど無く、また溶接部についても、側壁の円形湾曲状凹部
によって圧縮応力がかかっているので、引張り応力によ
る割れの発生が少ない。さらに、凹部の形状が円形湾曲
状になっているので、段状の平面状凹部を設けた場合と
比較して、両者が電池ケースの厚みの最小寸法が同一で
あっても電池内容積の減少は本発明の円形湾曲状凹部の
場合の方が少なく、内圧特性、電池保存特性ともに円形
湾曲状凹部による劣化は、ほとんどないものである。According to the present invention, even if the internal pressure of the battery is increased due to overcharging or the electrode group expands during the life of the charge / discharge cycle, the rectangular battery case is preliminarily centered on the portion having the largest expansion width. Since the circular curved concave portion is formed, the battery case hardly expands beyond the maximum portion of the thickness of the battery case, and the compressive stress is applied to the welded portion by the circular curved concave portion on the side wall. The occurrence of cracks due to cracking is small. Furthermore, the shape of the concave part is a circular curve
As compared with the case where a step-shaped planar concave portion is provided, even when both have the same minimum size of the thickness of the battery case, the decrease in the battery internal volume is reduced by the circular curved concave portion of the present invention. Is less, and both internal pressure characteristics and battery storage characteristics are circular.
There is almost no deterioration due to the curved concave portion.
【０００８】[0008]
【実施例】以下、本発明の１実施例につき図面を参照し
て説明する。図１、２において図３に示す従来例と同じ
構成部分については同一符号を付し、詳細な説明を省略
する。An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, the same components as those of the conventional example shown in FIG. 3 are denoted by the same reference numerals, and detailed description thereof will be omitted.
【０００９】図１、２において１０は、円形湾曲状のプ
レス面１１を有するプレス型であり、電池底面からの高
さ位置ｈが電池総高さの１／２を上限とし１／３を下限
とする範囲の位置に、電池ケースの厚みｔの最小部１２
が位置するように円形湾曲状凹部１３を形成するもので
ある。In FIGS. 1 and 2, reference numeral 10 denotes a press die having a press surface 11 having a circular curved shape , and a height position h from the bottom surface of the battery is set at an upper limit of 1/2 of the total battery height and at a lower limit of 1/3 of the total battery height.
The position of the range with the smallest portion 12 of the thickness t of the battery case
Is formed so that the circular concave portion 13 is located.
【００１０】図２は、角形密閉式電池の断面図であり、
極板群５を挿入した角形電池ケース１と封口板６が、溶
接部８においてレーザー溶接されている。ここで円形湾
曲状凹部１３の中心部の厚みは、電池ケースの厚み最小
部１２の厚みｔ1 となり、電池ケースの厚みの最大部ｔ
に対して、９０〜９７％となるように加工する。その場
合、溶接部８には、圧縮応力ｂが作用することになる。FIG. 2 is a sectional view of a prismatic sealed battery,
The prismatic battery case 1 in which the electrode group 5 is inserted and the sealing plate 6 are laser-welded at the welding portion 8. Here the circular bay
The thickness of the central portion of the song-like recess 13, next to the thickness t 1 of the thickness minimum section 12 of the battery case, the maximum portion t of the thickness of the battery case
To 90-97%. In that case, a compressive stress b acts on the welded portion 8.
【００１１】次に、本発明の１実施例による角形密閉式
電池をロット１、円形湾曲状凹部を設けた位置が本発明
と異なる角形密閉式電池をロット２、ロット３、円形湾
曲状凹部の中心部が電池ケースの厚み最小部となるが、
その厚みが本発明と異なる角形密閉式電池をロット４、
ロット５、凹部形状が本発明と異なり段状の平面形状に
した角形密閉式電池をロット６、従来の角形電池ケース
の側壁が垂直になっている角形密閉式電池をロット７と
して、それぞれ各ロット１００個ずつの電池を試作し、
４５℃恒温下において充放電レート１Ｃ／１Ｃで充放電
を繰返し、電池使用寿命が尽きるまでの溶接部における
引張り応力割れの発生率、電圧不良発生率、安全弁作動
による漏液発生率をそれぞれ比較した。その結果を（表
１）に示す。Next, the sealed rectangular battery according to one embodiment of the present invention is Lot 1, and the sealed rectangular batteries provided with the circular curved concave portions are different from the present invention in Lot 2, Lot 3, and circular bay.
The center of the curved concave portion is the minimum thickness of the battery case ,
Lot 4, a sealed rectangular battery whose thickness is different from that of the present invention.
Lot 5, a sealed rectangular battery in which the concave shape is different from the present invention and has a stepped planar shape is referred to as Lot 6, and a sealed rectangular battery in which a conventional rectangular battery case has a vertical side wall is referred to as Lot 7, respectively. Prototype 100 batteries at a time,
Charge / discharge was repeated at a constant charge / discharge rate of 1C / 1C at a constant temperature of 45 ° C, and the occurrence rate of tensile stress cracking, the occurrence rate of voltage failure, and the occurrence rate of liquid leakage due to the operation of the safety valve were compared until the end of the service life of the battery. . The results are shown in (Table 1).
【００１２】[0012]
【表１】 [Table 1]
【００１３】上記（表１）の結果より明らかなように、
従来の角形密閉式電池においては、溶接部に引張り応力
割れの発生が見られたが、本発明の実施例による角形密
閉式電池においては、引張り応力による割れ、電圧不
良、および漏液の発生は見られなかった。これは、本発
明においては、円形湾曲状凹部を角形電池ケースの対向
側壁に設けることにより負荷された溶接部の圧縮応力
が、電池膨張による溶接部の引張り応力より大であるた
め、引張り応力割れの要因が取り除かれたからである。As is clear from the results of the above (Table 1),
In the conventional rectangular sealed battery, the occurrence of tensile stress cracking was observed at the welded portion, but in the rectangular sealed battery according to the embodiment of the present invention, cracking due to tensile stress, defective voltage, and generation of liquid leakage were observed. I couldn't see it. This is because, in the present invention, since the compressive stress of the welded portion applied by providing the circular curved concave portion on the opposite side wall of the rectangular battery case is larger than the tensile stress of the welded portion due to the battery expansion, the tensile stress cracking occurs. This is because the factor has been removed.
【００１４】また、本発明における位置以外に、円形湾
曲状凹部を電池ケースの側壁に設けた角形密閉式電池
は、引張り応力割れの発生がみられた。これは、電池が
最も膨張する位置に電池厚み最小部が形成されていない
ため電池膨張防止効果が不充分であり、封口の溶接部に
引張り応力が生じたためである。[0014] Also, in addition to the position in the present invention, a circular Bay
In the rectangular sealed battery in which the curved concave portion was provided on the side wall of the battery case, occurrence of tensile stress cracking was observed. This is because the battery expansion preventing effect was insufficient because the minimum battery thickness portion was not formed at the position where the battery expanded most, and tensile stress was generated in the welded portion of the seal.
【００１５】次に、電池ケースの厚み最小部の厚みが、
本発明における角形密閉式電池より小さいものは、電圧
不良および漏液が発生した。これは、過大な凹部加工に
より、正極板と負極板がセパレータを貫通して短絡した
もの、および電池内圧の上昇により電池封口板にある安
全弁が作動したものである。また、反対に電池ケースの
厚み最小部の厚みが、本発明における角形密閉式電池よ
り大きいものは、引張り応力割れの発生が見られた。こ
れは、極板群の膨張による溶接部の引張り応力が、円形
湾曲状凹部を設けることにより負荷された溶接部の圧縮
応力を上廻ったためである。さらに、凹部の形状が段状
で平面状のものは、引張り応力割れおよび漏液の発生が
みられた。これは段状で平面状の凹部では、強度的に電
池膨張防止効果が不充分であり、また、電池ケースの厚
み最小部の厚みが円形湾曲状凹部と同一である場合にお
いて、減少する電池内容積は曲面プレスの約３倍である
ため、電池の内圧が上昇し、封口板の安全弁が作動した
ものである。Next, the minimum thickness of the battery case is
When the battery was smaller than the sealed rectangular battery in the present invention, a voltage failure and liquid leakage occurred. This is due to the fact that the positive electrode plate and the negative electrode plate were short-circuited through the separator due to excessive concave processing, and the safety valve in the battery sealing plate was activated due to an increase in battery internal pressure. Conversely, when the minimum thickness of the battery case was larger than the rectangular sealed battery of the present invention, the occurrence of tensile stress cracking was observed. This is because the tensile stress of the weld due to the expansion of the electrode group is circular.
This is because the provision of the curved concave portion exceeded the compressive stress applied to the welded portion. Furthermore, the shape of the recess is stepped
In the case of a flat plate, tensile stress cracking and generation of liquid leakage were observed. This is because the stepped and flat concave portion has insufficient strength to prevent battery expansion in terms of strength, and the battery content decreases when the minimum thickness of the battery case is the same as that of the circular curved concave portion. Since the product is about three times that of the curved press, the internal pressure of the battery rises and the safety valve of the sealing plate is activated.
【００１６】[0016]
【発明の効果】以上説明したように本発明角形密閉式電
池は、角形電池ケースの極板積層方向の両面に円形湾曲
状の凹部を設け、かつその中心部の位置が電池総高さの
１／２を上限とし１／３を下限とする範囲の箇処である
ため、角形電池ケースと封口板の溶接部に引張り応力割
れが発生せず、さらに円形湾曲状凹部の中心部が電池ケ
ースの厚みの最小部となり、その寸法が、電池ケースの
厚み最大部分の９０〜９７％となるようにしたため、前
記溶接部には圧縮応力が作用して引張り応力割れが発生
しないのみならず、正負極板の短絡、ならびに封口板に
安全弁を取り付けた場合の当該安全弁の作動などがな
く、電子電気機器に使用し易いものである。As described above, the rectangular sealed battery according to the present invention has a circular curved shape on both sides of the prismatic battery case in the direction of electrode plate lamination.
The Jo recess provided, and because the position of the center portion is a箇処range to lower 1/3 to a maximum of half of the battery total height, tensile weld prismatic battery case and the sealing plate Stress cracking did not occur, and the center of the circular curved concave portion was the minimum thickness of the battery case, and its size was 90 to 97% of the maximum thickness of the battery case. It is easy to use for electronic and electric equipment because there is no tensile stress cracking due to compressive stress, no short circuit of the positive and negative electrodes, and no operation of the safety valve when a safety valve is attached to the sealing plate. is there.
【図１】本発明の１実施例における角形密閉式電池の成
型過程を説明する斜視図FIG. 1 is a perspective view for explaining a molding process of a prismatic sealed battery according to one embodiment of the present invention.
【図２】同角形密閉式電池の断面図FIG. 2 is a cross-sectional view of a rectangular sealed battery.
【図３】 （イ）従来の角形密閉式電池の膨張前の一部切欠断面図 （ロ）同膨張後の側面図FIG. 3 (a) A partially cutaway sectional view of a conventional rectangular sealed battery before expansion (b) a side view after expansion
【図４】従来の角形密閉式電池の角形電池ケースと封口
板の溶接部の説明図FIG. 4 is an explanatory view of a welded portion between a rectangular battery case and a sealing plate of a conventional rectangular sealed battery.
１ 角形電池ケース ５ 極板群 ６ 封口板 ７ 最大膨張点 ８ 溶接部 ９ 引張り応力割れ部 １２ 電池ケースの厚みｔの最小部 １３ 円形湾曲状凹部DESCRIPTION OF SYMBOLS 1 Rectangular battery case 5 Electrode plate group 6 Sealing plate 7 Maximum expansion point 8 Welding part 9 Tensile stress cracking part 12 Minimum part of battery case thickness t 13 Circular curved concave part
フロントページの続き (72)発明者 藤井 隆文 大阪府門真市大字門真1006番地 松下電 器産業株式会社内 (56)参考文献 特開 平３−77261（ＪＰ，Ａ) 特開 平５−13054（ＪＰ，Ａ) 特開 平４−106864（ＪＰ，Ａ) 実開 昭59−103367（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H01M 2/02Continuation of the front page (72) Inventor Takafumi Fujii 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-77261 (JP, A) JP-A-5-13054 (JP) JP-A-4-106864 (JP, A) JP-A-59-103367 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) H01M 2/02
Claims (3)
に積層してなる極板群を挿入した角形電池ケースの開口
部に封口板を嵌合し、この嵌合部を気密に溶接する角形
密閉式電池において、極板群の積層方向であって相対向
する角形電池ケースの両側面に、底面より電池総高さの
１／２を上限とし、１／３を下限とする範囲の位置で、
かつ角形電池ケースの厚み最大部の９０乃至９７％とな
る厚み最小部を中心部として外周にゆくに従って前記中
心部よりは厚みが厚く前記角形電池ケースの厚み最大部
よりは薄く形成した曲面の緩やかな円形湾曲状凹部を設
けたことを特徴とする角形密閉式電池。1. A sealing plate is fitted into an opening of a rectangular battery case into which an electrode plate group in which positive and negative plates are alternately laminated via a separator is inserted, and this fitted portion is hermetically welded. In a sealed rectangular battery, positions on both sides of a rectangular battery case that are opposed to each other in the stacking direction of the electrode group in a range in which the upper limit is 1/2 of the total battery height from the bottom and the lower limit is 1/3. so,
In addition, the center of the prismatic battery case is 90 to 97% of the maximum thickness, and the center is the minimum thickness.
The thickness is larger than the core and the maximum thickness of the rectangular battery case
A sealed rectangular battery characterized in that a thin circular curved concave portion with a gentle curved surface is provided.
電池総高さの１／２の部分に位置させた請求項１記載の
角形密閉式電池。2. The sealed rectangular battery according to claim 1, wherein the center of the circular curved concave portion is located at a half of the total battery height from the bottom surface of the battery.
池ケースの厚み最大部の９５％とした請求項１または２
記載の角形密閉式電池。3. The thickness of the central portion of the circular concave portion is 95% of the maximum thickness of the rectangular battery case.
The sealed rectangular battery described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3186024A JP2864175B2 (en) | 1991-07-25 | 1991-07-25 | Prismatic sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3186024A JP2864175B2 (en) | 1991-07-25 | 1991-07-25 | Prismatic sealed battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0528973A JPH0528973A (en) | 1993-02-05 |
| JP2864175B2 true JP2864175B2 (en) | 1999-03-03 |
Family
ID=16181063
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3186024A Expired - Lifetime JP2864175B2 (en) | 1991-07-25 | 1991-07-25 | Prismatic sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2864175B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101802347B1 (en) * | 2014-11-18 | 2017-11-28 | 주식회사 엘지화학 | Rectangular Type Secondary Battery Comprising Arcuate-shaped Top Cap and Method for Preparing the Same |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3535503B1 (en) | 2002-10-22 | 2004-06-07 | 沖電気工業株式会社 | Frequency modulation device and modulation frequency measuring method thereof |
| JP5412919B2 (en) * | 2009-03-30 | 2014-02-12 | 株式会社Ｇｓユアサ | Sealed battery and method for manufacturing sealed battery |
| JP2019145201A (en) * | 2016-05-31 | 2019-08-29 | 株式会社村田製作所 | Secondary cell |
| JP7360820B2 (en) * | 2019-05-30 | 2023-10-13 | 日立造船株式会社 | Secondary battery and its manufacturing method |
| JP7725350B2 (en) * | 2021-12-08 | 2025-08-19 | カナデビア株式会社 | solid state battery |
-
1991
- 1991-07-25 JP JP3186024A patent/JP2864175B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101802347B1 (en) * | 2014-11-18 | 2017-11-28 | 주식회사 엘지화학 | Rectangular Type Secondary Battery Comprising Arcuate-shaped Top Cap and Method for Preparing the Same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0528973A (en) | 1993-02-05 |
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