JPS62165861A - Cylindrical lithium cell - Google Patents
Cylindrical lithium cellInfo
- Publication number
- JPS62165861A JPS62165861A JP823586A JP823586A JPS62165861A JP S62165861 A JPS62165861 A JP S62165861A JP 823586 A JP823586 A JP 823586A JP 823586 A JP823586 A JP 823586A JP S62165861 A JPS62165861 A JP S62165861A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- electrode plates
- plate
- collector
- current collector
- 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
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 239000010955 niobium Substances 0.000 claims abstract description 11
- 229910052715 tantalum Inorganic materials 0.000 claims abstract description 10
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 9
- 239000011651 chromium Substances 0.000 claims abstract description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 4
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 claims abstract description 4
- GUVRBAGPIYLISA-UHFFFAOYSA-N tantalum atom Chemical compound [Ta] GUVRBAGPIYLISA-UHFFFAOYSA-N 0.000 claims abstract description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 abstract description 8
- -1 polytetrafluoroethylene Polymers 0.000 abstract description 4
- 239000000843 powder Substances 0.000 abstract description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004743 Polypropylene Substances 0.000 abstract description 2
- 239000011230 binding agent Substances 0.000 abstract description 2
- 239000004020 conductor Substances 0.000 abstract description 2
- 229920001155 polypropylene Polymers 0.000 abstract description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 abstract description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 abstract description 2
- 238000005096 rolling process Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000003466 welding Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 abstract 1
- 238000004898 kneading Methods 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
- 229910000859 α-Fe Inorganic materials 0.000 abstract 1
- 230000007797 corrosion Effects 0.000 description 12
- 238000005260 corrosion Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 5
- 239000003792 electrolyte Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000005486 organic electrolyte Substances 0.000 description 3
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910000967 As alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000963 austenitic stainless steel Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007789 sealing Methods 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
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/16—Cells with non-aqueous electrolyte with organic electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/06—Electrodes for primary cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/66—Selection of materials
- H01M4/669—Steels
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Primary Cells (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、エレクトロニクス関連の小形電子機器用電源
として使用される円筒形リチウム電池において、特に正
極板の集電体材料に関するものであ社
従来の技術
従来、この種の円筒形リチウム電池は、放電電流を極力
大きく取り出せる様にシート状の正極と負極をセパレー
タを介して渦巻き状に巻き込んだ構成として正負極板の
表面積を大きくしたものがある。極板の表面積を出来る
だけ大きくする為て薄形極板を用いてセパレータを介し
て渦巻き状に巻き込むが、正極集電体の材質によっては
有機電解液とMnO2主体の正極合剤が直接集電体に接
する為に耐電解液性、耐酸化性が必要である。更に薄形
原板を渦巻き状電極構成にする為に正極集電体の厚みが
薄くかつ、多孔性でなければならない。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a current collector material for a positive electrode plate in a cylindrical lithium battery used as a power source for small electronic devices related to electronics. Conventionally, this type of cylindrical lithium battery has a structure in which a sheet-shaped positive electrode and a negative electrode are spirally wound through a separator to increase the surface area of the positive and negative electrode plates in order to extract as much discharge current as possible. In order to increase the surface area of the electrode plate as much as possible, a thin electrode plate is used and wound in a spiral shape through a separator, but depending on the material of the positive electrode current collector, the organic electrolyte and the positive electrode mixture mainly composed of MnO2 may collect current directly. Electrolyte resistance and oxidation resistance are required for contact with the body. Furthermore, in order to form the thin original plate into a spiral electrode configuration, the positive electrode current collector must be thin and porous.
一般に金町の薄板をラス加工すると、加工歪みが起って
耐食性が劣化する。特に正11J−ド板を集電体にスど
ソト溶接した場合、溶接部や、その周辺部の腐食が顕著
になる。この為、高温中で長期間電池を保存すると開路
電圧が低下する。この現象は集電体が腐食して溶解し、
その金富がイオンとなって電解液中に溶は込み、負極L
1とのイオン化傾向の差により色原上に析出してLiを
溶解させて電池容量が低下する事に起因するものである
。Generally, when lath-processing thin sheets of Kanamachi, processing distortion occurs and corrosion resistance deteriorates. In particular, when a positive 11J-board plate is spot welded to a current collector, corrosion of the welded portion and its surrounding areas becomes noticeable. For this reason, if a battery is stored for a long period of time at high temperatures, the open circuit voltage will decrease. This phenomenon occurs when the current collector corrodes and dissolves.
The gold rich becomes ions and dissolves into the electrolyte, and the negative electrode L
This is due to the fact that due to the difference in ionization tendency between Li and Li, it precipitates on the chromogen and dissolves Li, resulting in a decrease in battery capacity.
発明が解決しようとする問題点
この様に従来の構成では集電体金属が有機電解液中に溶
出して負極表面へ析出し、電気化学的に溶解して電圧を
低下させると言う問題点があった。Problems to be Solved by the Invention As described above, the conventional configuration has the problem that the current collector metal is eluted into the organic electrolyte, deposits on the negative electrode surface, and is electrochemically dissolved, reducing the voltage. there were.
本発明は、この様な問題点を正極集電体の改良により解
決することを目的とするものである。The present invention aims to solve these problems by improving the positive electrode current collector.
問題点を解決するだめの手段
この様な問題点を解決するだめに本発明は、シート状の
薄形正極板の集電体にクロム、ニオブ、タンタルヲ含む
フェライト系のステンレス鋼薄板の多孔体を使用したも
のである。Means to Solve the Problems In order to solve these problems, the present invention uses a porous thin plate of ferritic stainless steel containing chromium, niobium, and tantalum as the current collector of the thin sheet-like positive electrode plate. This is what I used.
作用
この構成により作成した薄形正極板を、セパレータを介
して負極Ll板と対向させて渦巻状の極板群としても、
正極集電体に耐電解液性のあるものを使用していること
から、電池の高温保存特性が優れたものにできる。Function: The thin positive electrode plate created with this configuration can also be used as a spiral-shaped electrode plate group by opposing the negative electrode Ll plate through a separator.
Since the positive electrode current collector is made of a material that is resistant to electrolyte, the battery can have excellent high-temperature storage characteristics.
実施例
図に本発明の一実施例として円筒形MnO2/Li電池
の半断面図を示す。図中、1は鉄にNiメッキした電池
容器、2はLi負極板で電池容器の内底部に負極のリー
ド板(図示せず)をスポット溶接しである。3は正極板
で熱処理したMnO2粉末に導電材として黒鉛粉末を1
Q重量%、結着剤としてポリ四弗化エチレン粉末を5重
量%加え、さらに水を添加して混練する。この合剤を圧
延ローラーでシート化した後、図示していないが、0.
1閣厚の18 Or −0,5(Wb−1−Ta )
ノーy ス加工した多孔性の正極集電体に圧入する。The figure shows a half-sectional view of a cylindrical MnO2/Li battery as an example of the present invention. In the figure, 1 is a battery case made of iron plated with Ni, 2 is a Li negative electrode plate, and a negative electrode lead plate (not shown) is spot-welded to the inner bottom of the battery case. 3, 1 graphite powder is added as a conductive material to the heat-treated MnO2 powder on the positive electrode plate.
Q% by weight, 5% by weight of polytetrafluoroethylene powder as a binder are added, and water is further added and kneaded. After this mixture was formed into a sheet using a rolling roller, it was made into a sheet with a 0.
1 cabinet thick 18 Or -0,5 (Wb-1-Ta)
Press into the porous positive electrode current collector that has undergone a nose treatment.
得られたシート状の正極板を110℃で乾燥後、所定の
寸法に切断してリード板4を正極板3の集電体に溶接す
る。このリード板を溶接した部分に図示していないが、
絶縁テープを表裏共に張り付けて補強する。ついで極板
の長さ方向の一端を巻き芯にして、微孔性ポリプロピレ
ンフィルムよりなるセパレータ6を介してLi負極板2
と対向させて渦巻状の極板群を構成する。群構成後、図
示していないが、Li負極のリード板を穴あき底部絶縁
板を介して電池容器内底部に接する様に挿入し、スポッ
ト溶接する。The obtained sheet-like positive electrode plate is dried at 110° C., cut into predetermined dimensions, and the lead plate 4 is welded to the current collector of the positive electrode plate 3. Although not shown in the figure, there is a part where this lead plate is welded.
Reinforce by pasting insulating tape on both the front and back sides. Next, one end of the electrode plate in the length direction is used as a core, and the Li negative electrode plate 2 is wrapped through a separator 6 made of a microporous polypropylene film.
A spiral electrode plate group is formed by facing the electrode plate. After forming the group, although not shown, a Li negative electrode lead plate is inserted through the perforated bottom insulating plate so as to be in contact with the inner bottom of the battery container, and spot welded.
以上の様にして極板群を電池容器に収納した後、炭酸プ
ロピレン(P C)と1.2−ジメトキシエタン(DM
E)との混合溶媒に、1モル/lとなる様KLiC10
4を溶解した電解液の所定量を注入後、上部絶縁板子の
中央孔より引出した正極リード板4を絶縁性封口ガスケ
ット8の中央部にカシメられたAJリベット9に溶接す
る。1Qけ正極端子を示す。この本発明の実施例による
2/3Aサイズの電池を従来の正極板を用いた同サイズ
の電池と比較した。After storing the electrode plate group in the battery container as described above, propylene carbonate (PC) and 1,2-dimethoxyethane (DM
KLiC10 in a mixed solvent with E) at a concentration of 1 mol/l.
After injecting a predetermined amount of an electrolytic solution in which 4 is dissolved, the positive electrode lead plate 4 pulled out from the center hole of the upper insulating plate is welded to the AJ rivet 9 crimped to the center of the insulating sealing gasket 8. 1Q shows the positive terminal. The 2/3 A size battery according to this embodiment of the present invention was compared with a battery of the same size using a conventional positive electrode plate.
本発明の180r−0,5(Nb−1−Ta )のフェ
ライト系ステンレス鋼からなる正極集電体を使用した電
池人と、従来のSuS 3o 4(1s 0r−sNi
)のオステナイト系ステンレス鋼からなる正極集電体を
使用した電池Bを80℃で高温保存し、電池特性を調べ
だ結果、人の場合には3か月経過しても何ら異常は認め
られなかった。しかし、従来の電池、Bでは2週間で開
路電圧に異常が発生した。このBの電池を分解して内容
を解析した結果、正極の集電体に腐食が見られ、L1負
極の表面が変色している事が確認された。この現象は腐
食した集電体の金属が溶解してイオンとなり、セパレー
タの微孔を透過してLi負極の表面に引き寄せられて析
出し、負極表面で局部的に自己放電したものであると考
えられる。特にリード板を溶接した部分の腐食が著しい
事が判った。A battery using a positive electrode current collector made of 180r-0,5 (Nb-1-Ta) ferritic stainless steel of the present invention and a conventional SuS 3o4 (1s0r-sNi)
) Battery B, which uses a positive electrode current collector made of austenitic stainless steel, was stored at a high temperature of 80°C and the battery characteristics were investigated. As a result, no abnormality was observed in humans even after 3 months. Ta. However, in the conventional battery B, an abnormality occurred in the open circuit voltage after two weeks. As a result of disassembling this battery B and analyzing its contents, it was confirmed that the current collector of the positive electrode was corroded and the surface of the L1 negative electrode was discolored. This phenomenon is thought to be due to the metal of the corroded current collector melting and becoming ions, which penetrate through the micropores of the separator and are attracted to the surface of the Li negative electrode and precipitate, causing local self-discharge on the negative electrode surface. It will be done. It was found that the corrosion was particularly severe in the part where the lead plate was welded.
NbとTaを合金成分として含有するフェライト系のス
テンレス鋼は、特に有機電解液に対する耐食性が著しく
向上する。又ラス加工などの応力腐食割れに対しても極
めて強い耐食性がある。又、リード板を溶接した場合の
粒界腐食を防止する為にNbとTaの両者を合わせて0
.5重量%程度添加すると優れた効果がある。NbとT
aの総和量で0.1重量%未満の添加では腐食防止には
不十分であす、0.1重量%は最低必要である。この少
量のNbとTaの役割は、鋼材中のC,Nとの親和力(
結合力)が強い性質を利用し、金属結晶内部にNb−C
,Ta−Nの型でとじ込め、粒界KG、Nを出しに<<
シだものであり、この為に溶接部分の耐食性が著しく向
北する。Nb 、Taの添加量は一般にフェライト系ス
テンレス鋼材中のC,Hの含有量よりやや過剰量でよく
、多く添加する必要はない。更に合金主成分のCrが2
0重量%を越えると耐食性は向上するが、Orのみを増
やすと薄板の生産性が悪くなる上に、コスト高になる問
題がある。例えば25重量%のOr含有ステンレス鋼で
あればMOは添加しなくても耐食性は維持できるが、薄
板の加工が出来にくい。一方、16重量%未満のOrで
あればコストは安くなるが、耐食性が落ちるので、これ
をカバーする為にMoの添加量を増やす必要がある。M
Oの添加量を増やす事はOrを増やすよりもコスト高に
なり、安価な集電体がむしろ得られK<くなる。Ferritic stainless steel containing Nb and Ta as alloy components has significantly improved corrosion resistance, especially against organic electrolytes. It also has extremely strong corrosion resistance against stress corrosion cracking caused by lath processing. In addition, in order to prevent intergranular corrosion when welding lead plates, both Nb and Ta are combined to 0.
.. Addition of about 5% by weight provides excellent effects. Nb and T
If the total amount of a is less than 0.1% by weight, it is insufficient for corrosion prevention, but 0.1% by weight is the minimum required amount. The role of this small amount of Nb and Ta is due to the affinity (
Nb-C inside the metal crystal by taking advantage of its strong bonding strength
, Ta-N mold, grain boundary KG, N exposed <<
Because of this, the corrosion resistance of the welded parts is significantly improved. Generally, the amount of Nb and Ta to be added may be slightly in excess of the C and H content in the ferritic stainless steel material, and there is no need to add a large amount. Furthermore, the main alloy component Cr is 2
If the content exceeds 0% by weight, corrosion resistance will be improved, but if only the amount of Or is increased, the productivity of the thin plate will deteriorate and there will be a problem that the cost will increase. For example, stainless steel containing 25% by weight of Or can maintain corrosion resistance without adding MO, but it is difficult to process into thin plates. On the other hand, if the Or content is less than 16% by weight, the cost will be lower, but the corrosion resistance will be lowered, so it is necessary to increase the amount of Mo added to compensate for this. M
Increasing the amount of O added is more expensive than increasing Or, and a cheaper current collector can be obtained rather than K<.
NbとTaの総和添加量が1重量%を越えると、コスト
高になる以外に、材料自体が非常にもろくなり、プレス
加工や、ラス加工性が悪くなる欠点がある。この様な理
由から、本発明で規定するOrを16〜19重量%、N
bとTaが総和量で0.1〜1.0重量%のフェライト
系ステンレス鋼が最も正極集電体として有効である。If the total addition amount of Nb and Ta exceeds 1% by weight, there is a disadvantage that not only the cost increases, but also the material itself becomes very brittle, resulting in poor press workability and lath workability. For these reasons, the amount of Or specified in the present invention is 16 to 19% by weight, and N
Ferritic stainless steel containing 0.1 to 1.0% by weight of b and Ta in total is most effective as a positive electrode current collector.
発明の効果
以上の如く本発明は、ハイレート放電を指向した渦巻状
極板群を有する円筒形リチウム電池の正極集電体を改良
することで、特に正極リード板のスポット溶接部の粒界
腐食を防止し、高温保存での安定性に極めて優れた円筒
形リチウム電池を提供するものである。Effects of the Invention As described above, the present invention improves the positive electrode current collector of a cylindrical lithium battery having a spiral electrode plate group oriented toward high-rate discharge, thereby reducing intergranular corrosion, particularly at the spot welded portion of the positive electrode lead plate. The object of the present invention is to provide a cylindrical lithium battery that has excellent stability under high-temperature storage.
図は本発明の正極集電体を使用した正極板を用で構成し
た円筒形リチクム電池の断面図である。
1・・・・・・電池容器、2・・・・・・Li負極板、
3・・・・・・正極板、4・・・・・・正極リード板、
6・・・・・・セパレータ。The figure is a cross-sectional view of a cylindrical lithicium battery having a positive electrode plate using the positive electrode current collector of the present invention. 1...Battery container, 2...Li negative electrode plate,
3...Positive electrode plate, 4...Positive electrode lead plate,
6...Separator.
Claims (2)
介して渦巻状に構成した電池であって、正極集電体とし
てクロム、ニオブ、タンタルを含むフェライト系の多孔
性ステンレス鋼薄板を用いた円筒形リチウム電池。(1) A battery in which a sheet-like positive electrode plate and a Li negative electrode plate are spirally arranged with a separator in between, and a ferritic porous stainless steel thin plate containing chromium, niobium, and tantalum is used as the positive electrode current collector. Cylindrical lithium battery.
ムを16〜19重量%、ニオブとタンタルを総和量で0
.1〜1.0重量%含み、残部が鉄からなる特許請求の
範囲第1項に記載の円筒形リチウム電池。(2) The thin stainless steel plate forming the positive electrode current collector contains 16 to 19% by weight of chromium and 0 total amount of niobium and tantalum.
.. The cylindrical lithium battery according to claim 1, wherein the cylindrical lithium battery contains 1 to 1.0% by weight, and the remainder is iron.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP823586A JPS62165861A (en) | 1986-01-17 | 1986-01-17 | Cylindrical lithium cell |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP823586A JPS62165861A (en) | 1986-01-17 | 1986-01-17 | Cylindrical lithium cell |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS62165861A true JPS62165861A (en) | 1987-07-22 |
Family
ID=11687486
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP823586A Pending JPS62165861A (en) | 1986-01-17 | 1986-01-17 | Cylindrical lithium cell |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS62165861A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8056258B2 (en) * | 2005-07-25 | 2011-11-15 | Bridgestone Corporation | Cord drying method and cord drying apparatus for carrying out the same |
-
1986
- 1986-01-17 JP JP823586A patent/JPS62165861A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8056258B2 (en) * | 2005-07-25 | 2011-11-15 | Bridgestone Corporation | Cord drying method and cord drying apparatus for carrying out the same |
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