JP3355948B2 - Prismatic secondary battery and method of manufacturing the same - Google Patents
Prismatic secondary battery and method of manufacturing the sameInfo
- Publication number
- JP3355948B2 JP3355948B2 JP21181796A JP21181796A JP3355948B2 JP 3355948 B2 JP3355948 B2 JP 3355948B2 JP 21181796 A JP21181796 A JP 21181796A JP 21181796 A JP21181796 A JP 21181796A JP 3355948 B2 JP3355948 B2 JP 3355948B2
- Authority
- JP
- Japan
- Prior art keywords
- secondary battery
- bag
- positive electrode
- separator
- negative electrode
- 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
-
- 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Cell Separators (AREA)
- Secondary Cells (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は多数枚の電極群から
構成される角形二次電池及びその製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a prismatic secondary battery comprising a large number of electrode groups and a method of manufacturing the same.
【０００２】[0002]
【従来の技術】角形二次電池としては、例えば、ニッケ
ル−カドミウム電池、ニッケル−水素電池などの小形二
次電池あるいは鉛蓄電池が実用化された実用技術であ
る。これらにおける、セパレ−タの使用形態を見ると、
ニッケル−カドミウム電池、ニッケル−水素電池では、
電池が小形小容量であり、また、電極自体の強度が十分
であるためセパレ−タはただ電極よりやや大きめのもの
を正極と負極の間に介在させているだけである。一方、
一部の鉛蓄電池では機械的に圧着した袋状セパレ−タを
用いる方式のものも知られている（特開平７−３０２６
１６号公報）。また、近年開発されたロッキングチェア
型リチウム二次電池では電極が薄く、それを多数枚積層
する角形密閉型二次電池では電極間の短絡を回避するた
めに袋状に加工したセパレ−タを用いることが提案され
ている。なお、これらの袋状セパレ−タでは、もとにな
るセパレ−タ膜は不織布状ではなく微孔膜状のものが一
般的である。2. Description of the Related Art As square secondary batteries, for example, small secondary batteries such as nickel-cadmium batteries and nickel-hydrogen batteries or lead storage batteries are practical techniques. Looking at the usage of separators in these,
For nickel-cadmium and nickel-hydrogen batteries,
Since the battery has a small size and a small capacity, and the strength of the electrode itself is sufficient, the separator is only slightly larger than the electrode between the positive electrode and the negative electrode. on the other hand,
Some lead-acid batteries are also known to use a mechanically crimped bag-shaped separator (JP-A-7-3026).
No. 16). In addition, recently developed rocking chair type lithium secondary batteries have thin electrodes, and a rectangular sealed secondary battery in which a large number of the electrodes are stacked uses a bag-shaped separator to avoid a short circuit between the electrodes. It has been proposed. Incidentally, in these bag-shaped separators, the base separator film is generally not a non-woven fabric but a microporous membrane.
【０００３】[0003]
【発明が解決しようとする課題】上記従来技術に記した
ロッキングチェア型のリチウム二次電池には、袋状に加
工したセパレ−タの加工技術が明確に規定されていない
ので、実用的に十分な固着強度あるいは、耐久性は保証
されていない。本発明の解決しようとする課題は、袋状
にセパレ−タを加工する技術において、上記従来技術で
は不明確な加工技術を明確にすることにある。The rocking chair type lithium secondary battery described in the above prior art does not clearly define the processing technology of the separator processed into a bag shape, so that it is practically sufficient. No strong fixing strength or durability is guaranteed. A problem to be solved by the present invention is to clarify a processing technique that is unclear in the above-described conventional technique in a technique for processing a separator in a bag shape.
【０００４】[0004]
【課題を解決するための手段】上記課題を解決するため
に、本発明の電極基体上に正極活物質合剤層を形成して
なる正極１、電極基体上に負極活物質合剤層を形成して
なる負極２、それらの両電極の間に介在するセパレー
タ、およびそれらの三者にわたって分布する電解液から
なる電池構成要素を角形密閉容器内に収納してなる角形
二次電池は、正極１と負極２の少なくとも一方を、ポリ
オレフィン系材料を溶着加工した袋状セパレータ３に収
納した構造であって、袋状セパレータ両側部の溶着加工
部分４は、透明な溶着部分と所定の一部に透明でない未
溶着部分が形成されていることを特徴とする。袋状セパ
レータの溶着加工部分４が透明になるということは、十
分に溶着部分が溶着したことであり、これにより実用的
に十分な固着強度あるいは、耐久性は確保される。ま
た、透明であるということは加工作業の不良を発見する
ことが容易になるという特長がある。すなわち、溶着の
のち、目視によって、あるいは光の透過度によって検査
することが容易である。本発明を実施するに当たって、
袋状セパレータ両側部の溶着加工部分４の所定の一部に
透明でない未溶着部分を形成することにより電極への電
解液の浸透を促進しつつ、かつ電極間の短絡を防止する
という効果がある。袋状セパレータ３のポリオレフィン
系材料の具体例はポリエチレン、ポリプロピレンまたは
それらの共存するものであり、かつ延伸などの処理によ
り白色不透明になっている微孔膜である。セパレータを
袋状に溶着加工するには加熱、圧縮による圧着、あるい
は加熱と圧縮による圧着の併用などの方法が特に適して
いる。なお、本発明の目的は袋状セパレータに挿入する
電極が正極であっても、負極であっても、あるいは正
極、負極の両方であっても達せられる。Means for Solving the Problems To solve the above problems, a positive electrode 1 having a positive electrode active material mixture layer formed on an electrode substrate according to the present invention, and a negative electrode active material mixture layer formed on an electrode substrate. A rectangular secondary battery comprising a negative electrode 2 , a separator interposed between the two electrodes, and a battery component comprising an electrolyte solution distributed over the three members in a rectangular sealed container is provided with a positive electrode 1. And at least one of the negative electrode 2 and a bag-shaped separator 3 formed by welding a polyolefin-based material, wherein the welded portions 4 on both sides of the bag-shaped separator are transparently welded and partially transparent. Not yet
It is characterized in that a welded portion is formed . The fact that the welded portion 4 of the bag-shaped separator becomes transparent means that the welded portion has been sufficiently welded, thereby ensuring practically sufficient fixing strength or durability. Also, being transparent has the advantage that it is easy to find defects in the processing operation. That is, after welding, it is easy to inspect visually or by light transmittance. In practicing the present invention,
To a predetermined part of the welded part 4 on both sides of the bag-shaped separator
By forming the non-transparent unwelded portion, there is an effect that the penetration of the electrolytic solution into the electrodes is promoted and a short circuit between the electrodes is prevented. A specific example of the polyolefin-based material of the bag-shaped separator 3 is polyethylene, polypropylene, or a coexisting material thereof, and is a microporous membrane that has become white and opaque by a process such as stretching. In order to weld the separator into a bag shape, a method such as heating, compression bonding, or a combination of heating and compression bonding is particularly suitable. It should be noted that the object of the present invention can be achieved whether the electrode inserted into the bag-shaped separator is a positive electrode, a negative electrode, or both a positive electrode and a negative electrode.
【０００５】また袋状セパレータ３に収納された電極の
製造法としては、上記溶着加工部分４を有する袋状セパ
レータ３を予め作製しておき、その後正極あるいは負極
あるいは正極、負極の双方を収納する方法が考えられ
る。また、セパレータ膜をＵ字状に折り曲げて電極を包
み、Ｕ字状に折り曲げた両側部を溶着加工する方法も考
えられる。しかし本発明はこれらに限定されない。[0005] As a method of manufacturing the electrodes housed in the bag-shaped separator 3, a bag-shaped separator 3 having the above-mentioned welded portion 4 is prepared in advance, and then the positive electrode or the negative electrode or both the positive electrode and the negative electrode are stored. A method is conceivable. Further, a method is also conceivable in which the separator film is bent in a U-shape to wrap the electrodes, and both sides of the U-shape are welded. However, the present invention is not limited to these.
【０００６】[0006]
【実施例】本発明を炭素系材料を負極に用いるロッキン
グチェア型の角形リチウム二次電池において実施した。
本発明を図面にもとづきさらに詳しく説明する。図２に
おいて、１は正極、２は負極であり、この場合正極１は
３の袋状セパレ−タに挿入された状態であり、これによ
り角形電極群が形成される。本発明の要点は３の袋状セ
パレ−タにあり、この構造を適正なものにすることによ
り本発明の目的が達成される。以下、具体的な実施例及
び比較例により更に詳しく説明する。 （実施例）図２に示した電極を以下のようにして作製し
た。負極電極基体には厚さ１５μｍの銅箔を、正極電極
基体には厚さ１５μｍのアルミニウム箔をそれぞれ用い
た。負極電極基体には平均粒径６μｍの人造黒鉛粉末の
スラリ−を塗布した。スラリ−の溶媒には、Ｎ−メチル
ピロリドン（ＮＭＰ）を、結着材にはポリフッ化ビニリ
デン（ＰＶＤＦ）をそれぞれ用いた。正極電極基体には
平均粒径３μｍのコバルト酸リチウム(ＬｉＣｏＯ2)、
導電剤の人造黒鉛粉末、結着材のＰＶＤＦ、および溶媒
のＮＭＰからなるスラリ−を塗布した。得られた乾燥状
態の電極をさらにロ−ルプレスにより成型し、所定の寸
法に切断し電極を得た。正極を袋状セパレータに収納す
る構成とし、厚さ２５μｍのポリエチレン材料の微孔膜
をＵ字状に折り曲げて正極を包み、Ｕ字状に折り曲げた
両側部を熱溶着した。図１に本発明になる袋状セパレ−
タに挿入された正極を示す。図において１は正極、３は
袋状セパレ−タであり、４はその溶着部分である。な
お、図の下端部は折り返し部分であるために溶着部分は
ない。本実施例ではこのときの溶着条件を検討し、溶着
するための合わせ面が相互に溶け合うまで加熱した。そ
の結果、白色のセパレ−タの溶着部分が透明になり、こ
のとき、波長５００〜７００μｍの範囲の可視光の透過
度が１０％以上となった。このように溶着した袋状セパ
レ−タに挿入した正極と負極を組み合わせて角形電池を
作製した。電極寸法は５５ｍｍ×６７ｍｍであり、正極
１８枚と負極１９枚からなり、電池容量は３．０Ａｈと
した。この電極群を角形金属容器に収納し、電解液を注
入し、密閉して密閉電池とした。このようにして得られ
た電池の２０個を高さ１．５ｍからコンクリ−ト製の床
面に１０回自然落下させた後、４．２Ｖと２．８Ｖの間
で１ＣｍＡの電流で充放電を１０回繰り返し、その後さ
らに高さ１．５ｍからコンクリ−ト製の床面に１０回自
然落下させた後、４．２Ｖと２．８Ｖの間で１ＣｍＡの
電流で充放電を１０回繰り返した。その結果、最初の１
０回の充放電では放電容量は平均２．９７Ａｈであり、
その後の１０回の充放電でも平均放電容量は２．９６Ａ
ｈであり、大幅な容量低下は見られなかった。EXAMPLE The present invention was carried out in a rocking chair type prismatic lithium secondary battery using a carbon-based material for the negative electrode.
The present invention will be described in more detail with reference to the drawings. In FIG. 2, reference numeral 1 denotes a positive electrode and 2 denotes a negative electrode. In this case, the positive electrode 1 is in a state of being inserted into a bag-shaped separator 3 to form a square electrode group. The gist of the present invention resides in the bag-shaped separator 3 and the object of the present invention is achieved by making this structure appropriate. Hereinafter, the present invention will be described in more detail with reference to specific examples and comparative examples. (Example) The electrode shown in FIG. 2 was produced as follows. A copper foil having a thickness of 15 μm was used for the negative electrode substrate, and an aluminum foil having a thickness of 15 μm was used for the positive electrode substrate. A slurry of artificial graphite powder having an average particle size of 6 μm was applied to the negative electrode substrate. N-methylpyrrolidone (NMP) was used as the slurry solvent, and polyvinylidene fluoride (PVDF) was used as the binder. Lithium cobaltate (LiCoO 2 ) having an average particle size of 3 μm was used for the positive electrode substrate,
A slurry composed of artificial graphite powder as a conductive agent, PVDF as a binder, and NMP as a solvent was applied. The obtained electrode in a dry state was further molded by a roll press, and cut into predetermined dimensions to obtain an electrode. The positive electrode was housed in a bag-shaped separator, and a microporous film of a polyethylene material having a thickness of 25 μm was bent in a U-shape to wrap the positive electrode, and both sides of the U-shape were thermally welded. FIG. 1 shows a bag-shaped separator according to the present invention.
3 shows a positive electrode inserted into the data. In the figure, 1 is a positive electrode, 3 is a bag-shaped separator, and 4 is a welded portion thereof. Since the lower end of the figure is a folded portion, there is no welded portion. In this example, the welding conditions at this time were examined, and heating was performed until the mating surfaces for welding were mutually fused. As a result, the welded portion of the white separator became transparent, and at this time, the transmittance of visible light in the wavelength range of 500 to 700 μm became 10% or more. A prismatic battery was manufactured by combining the positive electrode and the negative electrode inserted in the bag-like separator thus welded. The electrode dimensions were 55 mm × 67 mm, comprising 18 positive electrodes and 19 negative electrodes, and the battery capacity was 3.0 Ah. The electrode group was housed in a rectangular metal container, an electrolyte was injected, and the container was closed to form a sealed battery. Twenty of the batteries thus obtained were naturally dropped from a height of 1.5 m onto a concrete floor 10 times, and then charged and discharged at a current of 1 CmA between 4.2 V and 2.8 V. Was repeated 10 times, and then dropped naturally on a concrete floor from a height of 1.5 m 10 times, and then charged and discharged 10 times with a current of 1 CmA between 4.2 V and 2.8 V. . As a result, the first 1
In zero charge / discharge, the discharge capacity is 2.97 Ah on average,
The average discharge capacity is 2.96 A even after 10 charge / discharge cycles.
h, and no significant capacity decrease was observed.
【０００７】（比較例）実施例と同様にして電池を製作
した。ただし、袋セパレ−タは白色のセパレ−タが透明
にならない条件で溶着した。その他の条件はすべて実施
例と同じである。他の電極の仕様、製法などは上記実施
例と同一にして、単三電池を製作した。得られた電池の
２０個を上記実施例と同一条件で、落下−充放電−落下
−充放電の試験をした。その結果、最初の１０回の充放
電では放電容量は平均２．９７Ａｈであり、その後の
２．９７Ａｈ回の充放電でも平均放電容量は２．７３Ａ
ｈであり、若干の容量低下が見られた。また、供試した
２０個の電池のうち２個が内部短絡を生じ、不安定な開
回路電圧を示した。Comparative Example A battery was manufactured in the same manner as in the example. However, the bag separator was welded under the condition that the white separator did not become transparent. All other conditions are the same as in the embodiment. AA batteries were manufactured in the same manner as in the above example except for the specifications and manufacturing method of the other electrodes. Twenty of the obtained batteries were subjected to a drop-charge-discharge-drop-charge-discharge test under the same conditions as in the above example. As a result, the average discharge capacity was 2.97 Ah in the first 10 charge / discharge cycles, and the average discharge capacity was 2.73 A in the subsequent 2.97 Ah charge / discharge cycles.
h, and a slight decrease in capacity was observed. In addition, two of the twenty batteries tested underwent internal short circuits and exhibited unstable open circuit voltages.
【０００８】[0008]
【発明の効果】本発明により、正極または負極の少なく
とも一方を袋状に溶着加工したポリオレフィン系材料か
らなるセパレータに収納した構造である角形二次電池に
おいて、該袋状セパレータ両側部の溶着加工部分に、透
明になる条件で溶着して溶着部分を形成すると共に、所
定の一部に透明にならない未溶着部分を形成することに
より、電極への電解液の浸透を促進しつつ、かつ急速充
放電や衝撃を繰り返しても短絡を起こしにくい堅牢な電
池構造が可能となる。According to the present invention, in a prismatic secondary battery having a structure in which at least one of a positive electrode and a negative electrode is housed in a bag made of a polyolefin-based material welded in a bag shape, welded portions on both sides of the bag-shaped separator are provided. At the same time, welding is carried out under the condition that it becomes transparent to form a welded part.
By forming an unwelded part that does not become transparent in a part of the battery, it is possible to create a robust battery structure that promotes the penetration of the electrolyte solution into the electrode and that is resistant to short circuits even after repeated rapid charging and discharging and impact. Become.
【図１】本発明に係る正極を挿入した袋状セパレータと
その溶着部分を示す図である。FIG. 1 is a view showing a bag-like separator into which a positive electrode according to the present invention is inserted and a welded portion thereof.
【図２】本発明に係る電極を用いた角形電池の電極群構
成を示す図である。FIG. 2 is a diagram showing an electrode group configuration of a prismatic battery using the electrode according to the present invention.
１．正極 ２．負極 ３．袋状セパレータ ４．袋状セパレータの溶着加工部分 1. 1. positive electrode Negative electrode 3. 3. bag-shaped separator Welded part of bag-shaped separator
Claims (4)
なる正極、電極基体上に負極活物質合剤層を形成してな
る負極、それらの両電極の間に介在するセパレータ、お
よびそれらの三者にわたって分布する電解液からなる電
池構成要素を角形密閉容器内に収納してなる角形二次電
池において、 上記正極と負極の少なくとも一方を、ポリオレフィン系
材料を溶着加工した袋状セパレータに収納した構造であ
って、該袋状セパレータ両側部の溶着加工部分は、透明
な溶着部分と所定の一部に透明でない未溶着部分が形成
されていることを特徴とする角形二次電池。1. A positive electrode comprising a positive electrode active material mixture layer formed on an electrode substrate, a negative electrode comprising a negative electrode active material mixture layer formed on an electrode substrate, and a separator interposed between the two electrodes. And a prismatic secondary battery in which battery components made of an electrolyte solution distributed over the three are housed in a rectangular sealed container, wherein at least one of the positive electrode and the negative electrode is a bag-shaped separator obtained by welding a polyolefin-based material. The welded portions on both sides of the bag-shaped separator are transparent.
Non-transparent unwelded part is formed at a certain welded part and a predetermined part
Prismatic secondary battery, characterized by being.
系材料がポリエチレン、ポリプロピレンまたはそれらの
共存するものであることを特徴とする請求項１記載の角
形二次電池。2. The prismatic secondary battery according to claim 1, wherein the polyolefin-based material constituting the bag-shaped separator is polyethylene, polypropylene or a coexisting material thereof.
適用する請求項１又は２記載の角形二次電池。3. The prismatic secondary battery according to claim 1, wherein the prismatic secondary battery is applied to a lithium ion secondary battery.
なる正極、電極基体上に負極活物質合剤層を形成してな
る負極、それらの両電極の間に介在するセパレータ、お
よびそれらの三者にわたって分布する電解液からなる電
池構成要素を角形密閉容器内に収納してなる角形二次電
池の製造法において、 上記正極と負極の少なくとも一方が、ポリオレフィン系
材料を溶着加工した袋状セパレータに収納されたもので
あり、前記溶着加工が袋状セパレータを構成するために
溶着すべき両側部を加熱又は圧縮又は加熱と圧縮を併用
して透明な溶着部分と所定の一部に透明でない未溶着部
分を形成することである角形二次電池の製造法。4. A positive electrode comprising a positive electrode active material mixture layer formed on an electrode substrate, a negative electrode comprising a negative electrode active material mixture layer formed on an electrode substrate, and a separator interposed between the two electrodes. And a method for producing a prismatic secondary battery in which battery components made of an electrolytic solution distributed over the three are housed in a prismatic closed container, wherein at least one of the positive electrode and the negative electrode is formed by welding a polyolefin-based material. It is housed in a bag-like separator, and the welding process heats or compresses both sides to be welded to form a bag-like separator into a transparent welded part and a predetermined part by using both heating and compression or heating and compression. Non-transparent unwelded part
Preparation of prismatic secondary battery is to form a minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21181796A JP3355948B2 (en) | 1996-08-12 | 1996-08-12 | Prismatic secondary battery and method of manufacturing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21181796A JP3355948B2 (en) | 1996-08-12 | 1996-08-12 | Prismatic secondary battery and method of manufacturing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1055795A JPH1055795A (en) | 1998-02-24 |
| JP3355948B2 true JP3355948B2 (en) | 2002-12-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21181796A Expired - Lifetime JP3355948B2 (en) | 1996-08-12 | 1996-08-12 | Prismatic secondary battery and method of manufacturing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3355948B2 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100365824B1 (en) * | 2000-05-13 | 2002-12-26 | 한국 파워셀 주식회사 | Lithium ion secondary battery |
| KR20020096731A (en) * | 2001-06-21 | 2002-12-31 | 주식회사 기노리텍 | Electric double layer parts and thereof manufacturing method |
| JP4422166B2 (en) * | 2007-03-29 | 2010-02-24 | シャープ株式会社 | Nonaqueous electrolyte secondary battery and manufacturing method thereof |
| KR100966024B1 (en) | 2007-04-24 | 2010-06-24 | 주식회사 엘지화학 | A electrochemical device having a different kind of separators |
| JP5274059B2 (en) * | 2008-03-13 | 2013-08-28 | 日立ビークルエナジー株式会社 | Winding battery manufacturing method |
| JP2013143336A (en) * | 2012-01-12 | 2013-07-22 | Nissan Motor Co Ltd | Manufacturing method of packed electrode, packed electrode, secondary battery, and heat sealing device |
| GB2520688B (en) | 2013-11-27 | 2019-05-01 | E M & I Maritime Ltd | Apparatus and method for inspecting flooded cavities in a floating offshore installation |
| US10164233B2 (en) | 2014-04-09 | 2018-12-25 | Nec Energy Devices, Ltd. | Lithium ion secondary battery comprising a heat sealed separator |
| WO2018043419A1 (en) * | 2016-08-29 | 2018-03-08 | リチウム エナジー アンド パワー ゲゼルシャフト ミット ベシュレンクテル ハフッング ウント コンパニー コマンディトゲゼルシャフト | Layered electrode body and power storage element |
| EP3401978B1 (en) * | 2017-05-09 | 2022-06-08 | Robert Bosch GmbH | Method for producing an electrode assembly for a battery cell |
-
1996
- 1996-08-12 JP JP21181796A patent/JP3355948B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1055795A (en) | 1998-02-24 |
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