JPH01319253A - Lithium cell - Google Patents
Lithium cellInfo
- Publication number
- JPH01319253A JPH01319253A JP63148301A JP14830188A JPH01319253A JP H01319253 A JPH01319253 A JP H01319253A JP 63148301 A JP63148301 A JP 63148301A JP 14830188 A JP14830188 A JP 14830188A JP H01319253 A JPH01319253 A JP H01319253A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- separator
- thin film
- electrode mixture
- black mix
- 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
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 13
- 229910052744 lithium Inorganic materials 0.000 title claims description 13
- 239000000203 mixture Substances 0.000 claims abstract description 38
- 239000010409 thin film Substances 0.000 claims abstract description 14
- -1 polyethylene Polymers 0.000 claims abstract description 13
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004698 Polyethylene Substances 0.000 claims abstract description 6
- 239000004743 Polypropylene Substances 0.000 claims abstract description 6
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 6
- 229920000573 polyethylene Polymers 0.000 claims abstract description 6
- 229920001155 polypropylene Polymers 0.000 claims abstract description 6
- 239000002861 polymer material Substances 0.000 claims abstract description 3
- 239000010408 film Substances 0.000 claims description 7
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 5
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 5
- 239000004745 nonwoven fabric Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims 1
- 239000000843 powder Substances 0.000 abstract description 8
- WHXSMMKQMYFTQS-IGMARMGPSA-N lithium-7 atom Chemical compound [7Li] WHXSMMKQMYFTQS-IGMARMGPSA-N 0.000 abstract description 6
- 229910052751 metal Inorganic materials 0.000 abstract description 6
- 239000002184 metal Substances 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 abstract 4
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 abstract 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 abstract 1
- 230000002950 deficient Effects 0.000 abstract 1
- 230000008595 infiltration Effects 0.000 abstract 1
- 238000001764 infiltration Methods 0.000 abstract 1
- 230000037431 insertion Effects 0.000 abstract 1
- 238000003780 insertion Methods 0.000 abstract 1
- 229920000058 polyacrylate Polymers 0.000 abstract 1
- 230000035515 penetration Effects 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 239000004809 Teflon Substances 0.000 description 2
- 229920006362 Teflon® Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 230000010220 ion permeability Effects 0.000 description 2
- 239000011255 nonaqueous electrolyte Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000010724 Wisteria floribunda Nutrition 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- WHXSMMKQMYFTQS-BKFZFHPZSA-N lithium-12 Chemical compound [12Li] WHXSMMKQMYFTQS-BKFZFHPZSA-N 0.000 description 1
- 239000011356 non-aqueous organic solvent Substances 0.000 description 1
- 239000005486 organic electrolyte Substances 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2300/00—Electrolytes
- H01M2300/0017—Non-aqueous electrolytes
- H01M2300/0025—Organic electrolyte
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Primary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Cell Separators (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
この発明は、リチウム電池に関し、特にセパレータの貫
通不良の発生を防止できるようにした構造に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a lithium battery, and particularly to a structure that can prevent the occurrence of separator penetration defects.
（従来の技術）
一般にリチウム電池では、ポリプロピレン不織布、ポリ
エチレンマイクロポーラスフィルムなどからなるセパレ
ータを挟んでその両側にそれぞれ二酸化マンガンを主成
分とする正極合剤と、金属リチウムを積層し、これらを
ケース内に密封した電池であり、内部抵抗が低く取り出
し得る電流容量が極めて大きな電池として実用化されて
いる。(Prior technology) Generally, in a lithium battery, a positive electrode mixture mainly composed of manganese dioxide and metallic lithium are laminated on both sides of a separator made of polypropylene nonwoven fabric, polyethylene microporous film, etc., and these are placed inside a case. It is a sealed battery, and has been put into practical use as a battery with low internal resistance and extremely large current capacity.
（発明が解決しようとする課題）
この種のリチウム電池では、以下の問題が指摘されてい
た。(Problems to be Solved by the Invention) The following problems have been pointed out in this type of lithium battery.
つまり電池の両極が短絡すると、非常に大きな短絡電流
が流れ、この短絡電流によって電池内部が過熱して破裂
などの危険性を伴なうことである。In other words, when the two poles of a battery are short-circuited, a very large short-circuit current flows, and this short-circuit current causes the inside of the battery to overheat and pose a risk of explosion.
このような現象は、前記セパレータの貫通不良によって
発生しやすい。Such a phenomenon is likely to occur due to poor penetration of the separator.
貫通不良の発生原因としては、正極合剤の塗布条件によ
ることが指摘されている。It has been pointed out that the cause of poor penetration is due to the application conditions of the positive electrode mixture.
塗布方法としては、一般に二酸化マンガンを活物質とす
る正極合剤にテフロン水性ディスバージョンと水を混練
してスラリー状またはシート状とし、これを多孔性集電
体に塗布または圧着し、定着していたが、厚みのばらつ
きや、正極合剤の接触面の凹凸や遊離した電解質粉末が
セパレータの表面に食い込むことによる極間距離の不均
一によってセパレータ貫通不良が発生する。The coating method generally involves mixing a positive electrode mixture containing manganese dioxide as an active material with Teflon aqueous dispersion and water to form a slurry or sheet, which is then applied or pressed onto a porous current collector and fixed. However, poor penetration through the separator occurs due to variations in thickness, unevenness of the contact surface of the positive electrode mixture, and uneven distance between the electrodes due to free electrolyte powder biting into the surface of the separator.
このような不具合を除去する対策として、セパレータを
重ねて用いる方法が考えられるが、重ねた場合には、電
池容量が低下するだけでなく内部抵抗が極めて大きくな
り、放電性能が低下し、こ・の種の電池の好特性を失い
兼ねるものとなる。One possible solution to this problem is to stack separators, but stacking separators not only reduces battery capacity but also increases internal resistance, reducing discharge performance. This may also cause the battery to lose its good characteristics.
本発明は以上の問題点に鑑みてなされたもので、内部抵
抗をそれほど高めることなくセパレータ貫通不良を防止
でき、内部短絡による破裂の危険性を回避でき、またセ
パレータ貫通不良による電池性能のばらつきをなくすよ
うにしたリチウム電池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 can prevent separator penetration defects without significantly increasing internal resistance, avoid the risk of bursting due to internal short circuits, and prevent variations in battery performance due to separator penetration defects. The purpose is to provide a lithium battery that eliminates the need for lithium batteries.
（課題を解決するための手段）
前記目的を達成するため、この発明は、不織布またはマ
イクロポーラスフィルムからなるセパレータを挟んでそ
の両側にそれぞれ二酸化マンガンを主成分とするスラリ
ー状ないしシート状正極合剤と、金属リチウムとを積層
したリチウム電池であって、前記正極合剤のセパレータ
に対する接触面には、ポリアクリルアミド、ポリアクリ
ル酸ソーダ、ポリエチレン、ポリプロピレンなどの中か
ら選ばれたイオン透過性の高分子物質の塗布により、イ
オン透過性の薄膜が予め形成されていることを特徴とす
る。(Means for Solving the Problems) In order to achieve the above object, the present invention provides a slurry-like or sheet-like positive electrode mixture containing manganese dioxide as a main component on both sides of a separator made of a nonwoven fabric or a microporous film. and metallic lithium, the contact surface of the positive electrode mixture with the separator is made of an ion-permeable polymer selected from polyacrylamide, sodium polyacrylate, polyethylene, polypropylene, etc. It is characterized in that an ion-permeable thin film is formed in advance by applying a substance.
（作 用）
以上の構成によれば、正極合剤とセパレータの間にイオ
ン透過性の薄膜を介在することによって、正極合剤の接
触面の凹凸や遊離した正極合剤微粉末を被覆し、これに
よって前記凹凸や微粉末のセパレータ表面への入り込み
による内部短絡や、正極合剤の厚みのばらつきによる極
間距離の部分的不均一による局部放電反応を大きく抑制
できるものである。(Function) According to the above configuration, by interposing the ion-permeable thin film between the positive electrode mixture and the separator, the unevenness of the contact surface of the positive electrode mixture and the loose positive electrode mixture fine powder are covered. This can greatly suppress internal short circuits caused by the unevenness or penetration of fine powder into the separator surface, and local discharge reactions caused by local unevenness in the interelectrode distance due to variations in the thickness of the positive electrode mixture.
（実 施 例）
以下、この発明の一実施例を図面を用いて詳細に説明す
る。(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.
図に示す電池は、負極間１と正極端子板３およびガスケ
ット４からなるケース内に正極合剤６とセパレータ５お
よび金属リチウム７からなる発電要素２が非水電解液９
とともに絶縁板８を介在させて密封されている。The battery shown in the figure has a power generating element 2 consisting of a positive electrode mix 6, a separator 5, and metal lithium 7 in a case consisting of a negative electrode gap 1, a positive terminal plate 3, and a gasket 4, and a non-aqueous electrolyte 9.
They are also sealed with an insulating plate 8 interposed therebetween.
セパレータ５．正極合剤６．金属リチウム７はそれぞれ
帯状に形成されており、これらはセパレータ５を挾んで
交互に正極合剤６．金属リチウム７が配置されるように
重ね合わされ、渦巻状にまかれている。そして、前記金
属リチウム７と負極缶１は負極リード板１１を介して接
続され、正極合剤６と正極端子板３は正極リード板１０
を介して接続されている。Separator 5. Positive electrode mixture6. The metal lithium 7 is formed into a band shape, and the positive electrode mixture 6. The metal lithium 7 is placed one on top of the other and is spirally distributed. The metal lithium 7 and the negative electrode can 1 are connected via the negative lead plate 11, and the positive electrode mixture 6 and the positive terminal plate 3 are connected to the positive electrode lead plate 10.
connected via.
前記セパレータ５は、イオン透過性が大で適度な機械的
強度を持つ多孔性の絶縁体、例えばポリプロピレン不織
布、ポリエチレンマイクロポーラスフィルムなどが用い
られる。The separator 5 is made of a porous insulator having high ion permeability and appropriate mechanical strength, such as a polypropylene nonwoven fabric or a polyethylene microporous film.
また、非水電解液９としては、非水の有機溶媒にアルカ
リ金属塩を溶かした有機電解液が用いられている。Further, as the non-aqueous electrolyte 9, an organic electrolyte in which an alkali metal salt is dissolved in a non-aqueous organic solvent is used.
また、前記正極合剤６は二酸化マンガンを主成分とし１
、これに黒鉛アセチレンブラックを加えるとともに、バ
インダとして、テフロン水性ディスバージョンおよび水
を添加し、混練してスラリー状ないしシート状とし、こ
れを多孔質集電体に塗布または圧着した後前記セパレー
タ５の表面に塗り付けまたは圧着するものであるが、こ
の発明では、その前段階でセパレータ５に対する接触面
に第２図に拡大して示すように予めイオン透過性の薄膜
１２が形成されていることが特徴となっている。In addition, the positive electrode mixture 6 contains manganese dioxide as a main component and 1
To this, graphite acetylene black is added, as well as Teflon aqueous dispersion and water as a binder, and the mixture is kneaded to form a slurry or sheet, which is applied or pressed onto a porous current collector, and then the separator 5 is formed. In this invention, an ion-permeable thin film 12 is formed in advance on the contact surface with the separator 5 as shown in an enlarged view in FIG. 2. It has become a feature.
この薄膜１２は、ポリアクリルアミド、ポリアクリル酸
ソーダ、ポリエチレン、ポリプロピレンなどのイオン透
過性高分子物質の中から選ばれたものであって、以下の
塗布方法によって正極合剤６の表面に形成される。This thin film 12 is selected from ion-permeable polymer materials such as polyacrylamide, sodium polyacrylate, polyethylene, and polypropylene, and is formed on the surface of the positive electrode mixture 6 by the following coating method. .
すなわち、ポリアクリルアミド、ポリアクリル酸ソーダ
を一例に示すと、これらの粉末は水に容易に溶解し、粘
性を帯びた水溶液となる。That is, taking polyacrylamide and sodium polyacrylate as an example, these powders easily dissolve in water and form a viscous aqueous solution.
したがって、この水溶液中に正極合剤６を浸漬し、引き
あげ乾燥すれば正極合剤６の表面にイオン透過性の薄膜
１２が形成されることになる。Therefore, if the positive electrode mixture 6 is immersed in this aqueous solution and then pulled up and dried, an ion-permeable thin film 12 will be formed on the surface of the positive electrode mixture 6.
なお、これらのイオン透過性の高分子物質を過剰に溶解
した溶液は粘性が高くなり過ぎ、これに正極合剤６を浸
漬塗着し、乾燥した状態では、濃淡部ができ厚い被膜に
形成され、イオン透過性が減少し、この被膜が抵抗体と
なって電池性能が低下する。Note that a solution in which these ion-permeable polymer substances are dissolved in excess becomes too viscous, so when the positive electrode mixture 6 is dip-coated and dried, dark and light areas are formed and a thick film is formed. , the ion permeability decreases, and this film becomes a resistor, resulting in a decrease in battery performance.
その逆に薄い溶液の場合には十分な被膜が形成されず、
貫通不良原因を解消できない。On the other hand, if the solution is thin, a sufficient film will not be formed.
The cause of poor penetration cannot be resolved.
したがって、前記ポリアクリルアミド、ポリアクリル酸
ソーダは適度な濃度とすることが必要であり、具体的に
は水１００部に対して０．０１〜０．２部添加した水溶
液中に正極合剤６を浸漬すれば、適度な厚みのイオン透
過性の薄１ｉ１１２を形成することができる。Therefore, it is necessary to set the polyacrylamide and sodium polyacrylate at an appropriate concentration. Specifically, the positive electrode mixture 6 is added to an aqueous solution of 0.01 to 0.2 parts per 100 parts of water. By dipping, an ion-permeable thin layer 1i112 having an appropriate thickness can be formed.
その後前述したようにこの正極合剤６をセパレータ５の
一面に、他面に金属リチウム７を積層し、渦巻状に巻回
すれば発電要素２を形成できるのである。Thereafter, as described above, the positive electrode mixture 6 is laminated on one side of the separator 5, and the metal lithium 7 is laminated on the other side, and is spirally wound to form the power generating element 2.
なお、以上の薄膜１２を正極合剤６とセパレータ５の間
に介在させたものと従来の薄膜をまったく形成しない正
極合剤を用いた電池の内部抵抗を比較ｍｊ定した結果、
従来が０゜２５Ωであったのに対し、本発明が０．３０
Ωとなり、従来に比べて多少内部抵抗が増加はする。し
かし、正極合剤６のセパレータ５に対する接触面の凹凸
や、遊離した正極合剤粉末は薄膜１２により被覆されて
いるので、セパレータ５の内部への嵌入がなく、これに
よって極間距離の不均一による局部放電反応や内部短絡
を未然に防止できるのである。In addition, as a result of comparing and determining the internal resistance of a battery in which the above thin film 12 is interposed between the positive electrode mixture 6 and the separator 5 and a battery using a conventional positive electrode mixture in which no thin film is formed, mj is determined.
While the conventional resistance was 0°25Ω, the current resistance was 0.30Ω.
Ω, and the internal resistance is slightly increased compared to the conventional one. However, the unevenness of the contact surface of the positive electrode mixture 6 with the separator 5 and the loose positive electrode mixture powder are covered with the thin film 12, so they do not fit into the inside of the separator 5, resulting in uneven distance between the electrodes. This prevents local discharge reactions and internal short circuits.
（発明の効果）
以上実施例によって詳細に説明したように、この発明に
よるリチウム電池にあっては、スラリー状ないしシート
状正極合剤とセパレータ間にイオン透過性の薄膜が介在
することによって、正極合剤の接触面の凹凸や遊離した
正極合剤微粉末を被覆し、これによって前記凹凸や微粉
末のセパレータ表面への入り込みによる内部短絡や、正
極合剤の厚みのばらつきによる極間距離の部分的不均一
に起因する局部放電反応を大きく抑制できることになる
。(Effects of the Invention) As explained in detail in the examples above, in the lithium battery according to the present invention, the ion-permeable thin film is interposed between the slurry-like or sheet-like positive electrode mixture and the separator, so that the positive electrode It covers the unevenness of the contact surface of the mixture and the loose positive electrode mixture fine powder, thereby preventing internal short circuits due to the unevenness and fine powder entering the separator surface, and the part of the distance between the electrodes due to variations in the thickness of the positive electrode mixture. This means that local discharge reactions caused by non-uniformity can be greatly suppressed.
したがってこの発明では内部短絡による破裂などの危険
性を回避でき、またそこまで至らなくても電池性能のば
らつきを一定の範囲に収めることができる。Therefore, in this invention, it is possible to avoid the risk of explosion due to internal short circuit, and even if it does not reach that point, it is possible to keep variations in battery performance within a certain range.
第１図はこの発明に係る筒形リチウム電池の一実施例を
示す断面図、第２図は第１図のＡ部拡大断面図である。
５・・・セパレータ ６・・・正極合剤７・・・
金属リチウム １２・・・イオン透過性薄膜特許出願
人 富士電気化学株式会社代 理 人
弁理士 −色 健軸向 弁理士 松本 雅利
第１図
第２図FIG. 1 is a sectional view showing an embodiment of a cylindrical lithium battery according to the present invention, and FIG. 2 is an enlarged sectional view of section A in FIG. 5... Separator 6... Positive electrode mixture 7...
Metallic lithium 12...Ion-permeable thin film patent applicant Fuji Electrochemical Co., Ltd. Agent
Patent attorney - color Ken axis Patent attorney Masatoshi Matsumoto Figure 1 Figure 2
Claims (1)
セパレータを挟んでその両側にそれぞれ二酸化マンガン
を主成分とするスラリー状ないしシート状正極合剤と、
金属リチウムとを積層したリチウム電池であって、前記
正極合剤のセパレータに対する接触面には、ポリアクリ
ルアミド、ポリアクリル酸ソーダ、ポリエチレン、ポリ
プロピレンなどの中から選ばれたイオン透過性の高分子
物質の塗布により、イオン透過性の薄膜が予め形成され
ていることを特徴とするリチウム電池。(1) On both sides of a separator made of nonwoven fabric or microporous film, a slurry-like or sheet-like positive electrode mixture containing manganese dioxide as a main component,
A lithium battery in which metallic lithium is laminated, and the contact surface of the positive electrode mixture with the separator is made of an ion-permeable polymer material selected from polyacrylamide, sodium polyacrylate, polyethylene, polypropylene, etc. A lithium battery characterized by having an ion-permeable thin film formed in advance by coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63148301A JPH01319253A (en) | 1988-06-17 | 1988-06-17 | Lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63148301A JPH01319253A (en) | 1988-06-17 | 1988-06-17 | Lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01319253A true JPH01319253A (en) | 1989-12-25 |
Family
ID=15449721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63148301A Pending JPH01319253A (en) | 1988-06-17 | 1988-06-17 | Lithium cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01319253A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06168739A (en) * | 1992-11-30 | 1994-06-14 | Canon Inc | Secondary battery |
| WO1994020995A2 (en) * | 1993-03-01 | 1994-09-15 | W.R. Grace & Co.-Conn. | Battery separators |
| EP0600718A3 (en) * | 1992-11-30 | 1995-11-15 | Canon Kk | Secondary battery. |
-
1988
- 1988-06-17 JP JP63148301A patent/JPH01319253A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06168739A (en) * | 1992-11-30 | 1994-06-14 | Canon Inc | Secondary battery |
| EP0600718A3 (en) * | 1992-11-30 | 1995-11-15 | Canon Kk | Secondary battery. |
| WO1994020995A2 (en) * | 1993-03-01 | 1994-09-15 | W.R. Grace & Co.-Conn. | Battery separators |
| WO1994020995A3 (en) * | 1993-03-01 | 1995-02-02 | Grace W R & Co | Battery separators |
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