JPH0645005A - Laminated lithium secondary battery - Google Patents
Laminated lithium secondary batteryInfo
- Publication number
- JPH0645005A JPH0645005A JP4043278A JP4327892A JPH0645005A JP H0645005 A JPH0645005 A JP H0645005A JP 4043278 A JP4043278 A JP 4043278A JP 4327892 A JP4327892 A JP 4327892A JP H0645005 A JPH0645005 A JP H0645005A
- Authority
- JP
- Japan
- Prior art keywords
- current collector
- electrode current
- outer peripheral
- negative electrode
- positive 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.)
- Withdrawn
Links
- 150000002641 lithium Chemical class 0.000 title claims description 13
- 230000002093 peripheral effect Effects 0.000 claims abstract description 19
- 238000000576 coating method Methods 0.000 claims description 7
- 238000005520 cutting process Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- -1 polyethylene Polymers 0.000 abstract description 18
- 239000004698 Polyethylene Substances 0.000 abstract description 13
- 229920000573 polyethylene Polymers 0.000 abstract description 13
- 238000007789 sealing Methods 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 description 32
- 239000002184 metal Substances 0.000 description 32
- 238000004080 punching Methods 0.000 description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 6
- 229920000767 polyaniline Polymers 0.000 description 6
- 239000011888 foil Substances 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910000838 Al alloy Inorganic materials 0.000 description 3
- 239000004697 Polyetherimide Substances 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000004809 Teflon Substances 0.000 description 3
- 229920006362 Teflon® Polymers 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- 210000005069 ears Anatomy 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001601 polyetherimide Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000733 Li alloy Inorganic materials 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000001989 lithium alloy Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- XHCLAFWTIXFWPH-UHFFFAOYSA-N [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[V+5].[V+5] XHCLAFWTIXFWPH-UHFFFAOYSA-N 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 description 1
- 150000001342 alkaline earth metals Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000006258 conductive agent Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000476 molybdenum oxide Inorganic materials 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- PQQKPALAQIIWST-UHFFFAOYSA-N oxomolybdenum Chemical compound [Mo]=O PQQKPALAQIIWST-UHFFFAOYSA-N 0.000 description 1
- 229920000128 polypyrrole Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910001935 vanadium oxide Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- Battery Electrode And Active Subsutance (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、一般に積層型リチウ
ム二次電池に関するものであり、より特定的には、正負
両極間の短絡を防止することができるように改良された
積層リチウム二次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a laminated lithium secondary battery, and more specifically, an improved laminated lithium secondary battery capable of preventing a short circuit between positive and negative electrodes. Regarding
【０００２】[0002]
【従来の技術】リチウムなどのアルカリ金属またはアル
カリ土類金属を負極とし、正極に二酸化マンガン、酸化
バナジウム、酸化モリブデン等の無機化合物やポリピロ
ール、ポリアニリン等の導電性高分子を用いた二次電池
が検討されている。これらの二次電池は、正極と負極の
間に、電解液が含浸された隔膜が配置された構造を有す
る。正極は、図４に示す多孔質金属、図５に示す金属メ
ッシュ、図６に示すエキスパンデドメタルまたは図７に
示すパンチングメタル等の集電体の上にまたは内部に形
成されている場合が多い。2. Description of the Related Art A secondary battery using an alkali metal such as lithium or an alkaline earth metal as a negative electrode and an inorganic compound such as manganese dioxide, vanadium oxide or molybdenum oxide or a conductive polymer such as polypyrrole or polyaniline as a positive electrode is known. Is being considered. These secondary batteries have a structure in which a diaphragm impregnated with an electrolytic solution is arranged between a positive electrode and a negative electrode. The positive electrode may be formed on or inside the current collector such as the porous metal shown in FIG. 4, the metal mesh shown in FIG. 5, the expanded metal shown in FIG. 6 or the punching metal shown in FIG. Many.
【０００３】たとえば、正極が二酸化マンガンの場合に
は、二酸化マンガンの粉末に、導電剤であるアセチレン
ブラックと結着剤であるテフロンを混合し、この混合物
を基板である集電体上で加圧成形し、それによって、電
極を形成する方法が採用される。For example, when the positive electrode is manganese dioxide, acetylene black which is a conductive agent and Teflon which is a binder are mixed with powder of manganese dioxide, and this mixture is pressed on a collector which is a substrate. The method of molding and thereby forming the electrodes is employed.
【０００４】また、正極がポリアニリン等の導電性高分
子の場合には、パンチングメタル、エキスパンデドメタ
ルまたは金属メッシュ等の集電体上または内部に、ポリ
アニリン等を電解重合で形成し、それによって電極を形
成する方法が採用される場合が多い。When the positive electrode is a conductive polymer such as polyaniline, polyaniline or the like is formed by electrolytic polymerization on or inside a collector such as punching metal, expanded metal or metal mesh, thereby A method of forming electrodes is often adopted.
【０００５】負極は、リチウム箔、リチウム−アルミニ
ウム合金箔等のリチウム合金箔を、金属メッシュやエキ
スパンデドメタル、パンチングメタル等の集電体上に圧
着して、形成される場合が多い。たとえば、出願人は、
多孔質金属、金属メッシュ、エキスパンデドメタルまた
はパンチングメタル等の貫通孔を有する集電体の貫通孔
内部に、リチウムまたはリチウム合金を充填し、それに
よって、形状安定性の優れたリチウム二次電池用負極を
得ることを提案している（特願平１−１３０８９１）。The negative electrode is often formed by pressing a lithium alloy foil such as a lithium foil or a lithium-aluminum alloy foil onto a current collector such as a metal mesh, expanded metal or punching metal. For example, the applicant
A lithium secondary battery having excellent shape stability by filling lithium or a lithium alloy inside the through hole of a current collector having a through hole such as porous metal, metal mesh, expanded metal or punching metal. It has been proposed to obtain a negative electrode for use (Japanese Patent Application No. 1-130891).
【０００６】一般的に、リチウム二次電池においては、
電解液溶媒に有機溶媒を使用しているために、水溶液系
の電池と比較して、導電率が低い。そのため、あまり大
きな電流密度が取出せないので、表面積を大きく取り、
電流を稼ぐ必要がある。そのために、出願人は、図８に
示すように、大容量化を図る１つの手段として、正極１
２、隔膜１３および負極１１を順次積層してなる積層型
リチウム二次電池を提案している（特開平１−１０５４
７７）。Generally, in a lithium secondary battery,
Since the organic solvent is used as the electrolytic solution solvent, the conductivity is lower than that of the aqueous solution type battery. Therefore, a very large current density cannot be obtained, so take a large surface area,
You need to make a current. Therefore, as shown in FIG. 8, the applicant has adopted a positive electrode 1 as one means for increasing the capacity.
2, a laminated lithium secondary battery in which a diaphragm 13 and a negative electrode 11 are sequentially laminated has been proposed (JP-A-1-1054).
77).
【０００７】[0007]
【発明が解決しようとする課題】しかしながら、図８を
参照して、正極１２、隔膜１３および負極１１を順次積
層していく際に、正極１２と負極１１が短絡することが
あった。However, referring to FIG. 8, when the positive electrode 12, the diaphragm 13 and the negative electrode 11 are sequentially laminated, the positive electrode 12 and the negative electrode 11 may be short-circuited.
【０００８】本発明者等は、短絡の原因を詳細に調査し
た結果、正極１２および負極１１に用いられる板状の集
電体である、パンチングメタル、エキスパンデドメタ
ル、金属メッシュ等の外周部に刃先が立ち、この刃先が
隔膜１３を突通し、ひいては短絡を引起こしているとい
うことを見出した。As a result of detailed investigation of the cause of the short circuit, the inventors of the present invention have conducted on the outer peripheral portions of punched metal, expanded metal, metal mesh, etc., which are plate-shaped current collectors used for the positive electrode 12 and the negative electrode 11. It was found that a blade edge was erected on the blade, the blade edge pierced the diaphragm 13 and caused a short circuit.
【０００９】この発明は上記のような問題点を解決する
ためになされたもので、正負両極間の短絡を防止するこ
とができるように改良された積層リチウム二次電池を提
供することを目的とする。The present invention has been made to solve the above problems, and an object thereof is to provide an improved laminated lithium secondary battery capable of preventing a short circuit between positive and negative electrodes. To do.
【００１０】[0010]
【課題を解決するための手段】この発明は、板状の正極
集電体、隔膜および板状の負極集電体が順次積層されて
なる積層リチウム二次電池に係るものである。上記問題
点を解決するために、上記板状の正極集電体および上記
板状の負極集電体の少なくとも一方の外周部に、該外周
部に生じている刃先を覆い隠すように被覆物を設けたこ
とを特徴とする。The present invention relates to a laminated lithium secondary battery in which a plate-shaped positive electrode current collector, a diaphragm and a plate-shaped negative electrode current collector are sequentially laminated. In order to solve the above problems, at least one outer peripheral portion of the plate-shaped positive electrode current collector and the plate-shaped negative electrode current collector, a coating so as to cover the cutting edge generated in the outer peripheral portion. It is characterized by being provided.
【００１１】正負両極の集電体には、金属メッシュ、エ
キスパンデドメタル、パンチングメタル、多孔質金属な
どが好ましく使用され、材質としては、ステンレス、ニ
ッケル、ニッケル−クロム合金、鉄、鉄合金、アルミニ
ウム、アルミニウム合金等が好ましく使用される。A metal mesh, expanded metal, punching metal, porous metal or the like is preferably used for the positive and negative electrode current collectors, and the material is stainless steel, nickel, nickel-chromium alloy, iron, iron alloy, Aluminum and aluminum alloys are preferably used.
【００１２】被覆物の材質としては、刃先を覆い隠すこ
とができるものならどのような材質でもよいが、電池電
解液に有機溶剤を使用しているために、溶剤との反応性
の低い、テフロン、ポリエチレン、ポリプロピレン、ポ
リイミド、ポリエチレンエレフタレート、ポリエーテル
イミド等が好ましく使用でき、その中でも、ポレエチレ
ン、ポリプロピレン、ポリエーテルイミド、ポリエチレ
ンテレフタレートなどが熱によって融着する性質を有す
るので、とくに好ましく使用される。Any material can be used as the material for the coating as long as it can cover the blade edge. However, since an organic solvent is used for the battery electrolyte, it has a low reactivity with the solvent, Teflon. , Polyethylene, polypropylene, polyimide, polyethylene elephthalate, polyether imide and the like can be preferably used, and among them, polyethylene, polypropylene, polyether imide, polyethylene terephthalate and the like have the property of being fused by heat, and thus are particularly preferably used. .
【００１３】[0013]
【作用】集電体には、優れた集電性能とともに、軽量で
あることも要求される。軽量にするためには、金属メッ
シュやエキスパンデドメタル、多孔質金属、パンチング
メタルなどの集電体の線径を細くしたり、薄くしたりす
る必要がある。しかしながら、そのようにすると、集電
体は非常に柔軟であるため、正極、隔膜、負極と順次積
層していく際、その外周部に刃先が立ち、隔膜を突通し
てしまう。The current collector is required to be lightweight as well as have excellent current collecting performance. In order to reduce the weight, it is necessary to thin or thin the wire diameter of a current collector such as a metal mesh, expanded metal, porous metal, or punching metal. However, in such a case, since the current collector is very flexible, when the positive electrode, the diaphragm, and the negative electrode are sequentially laminated, the cutting edge stands on the outer peripheral portion thereof and penetrates the diaphragm.
【００１４】本願に係る発明では、上記板状の正極集電
体および上記板状の負極集電体の少なくとも一方の外周
部を被覆するように被覆物を設けたので、集電体の外周
部付近の部分が動きにくくなり、外周部の刃先が立ちに
くくなる。また、刃先自身も被覆物に埋め込まれてしま
う。In the invention according to the present application, since the coating is provided so as to cover the outer peripheral portion of at least one of the plate-shaped positive electrode current collector and the plate-shaped negative electrode current collector, the outer peripheral portion of the current collector is provided. It is difficult for the neighboring parts to move, making it difficult for the cutting edge on the outer circumference to stand. Further, the cutting edge itself is also embedded in the coating.
【００１５】[0015]
【実施例】以下、この発明の一実施例を図について説明
する。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.
【００１６】図１は、この発明の一実施例に係る積層リ
チウム二次電池に用いられる、正極の製造工程図であ
る。FIG. 1 is a manufacturing process drawing of a positive electrode used in a laminated lithium secondary battery according to an embodiment of the present invention.
【００１７】図１（ａ）を参照して、１２０メッシュス
テンレスの電極集電体１（サイズ２０ｃｍ×３０ｃｍ
（ただし、端部、耳１ａを除く））を準備する。図１
（ｂ）を参照して、この電極集電体１上に、電解重合法
により、ポリアニリン２を形成する。図において、端
部、耳１ａを除いた斜線部分がポリアニリン２である。
電極集電体１上にポリアニリン２を形成した後、純水で
洗浄し、その後乾燥した。Referring to FIG. 1A, a 120 mesh stainless steel electrode current collector 1 (size 20 cm × 30 cm)
(However, excluding the end and the ear 1a)) is prepared. Figure 1
Referring to (b), polyaniline 2 is formed on this electrode current collector 1 by electrolytic polymerization. In the drawing, the polyaniline 2 is the hatched portion excluding the ends and the ears 1a.
After forming polyaniline 2 on the electrode current collector 1, it was washed with pure water and then dried.
【００１８】図１（ｃ）を参照して、電極集電体１の外
周部を、端部取出しのための耳部分１ａを除いて、約３
ｍｍほど、ポリエチレンシート３（厚み０．１４ｍｍ）
で被覆した。被覆の方法は、次のようにして行った。す
なわち、図２に示すように、ポリエチレンシート３を端
部で折返し、この折返したもので電極集電体１の外周部
を挟み、その後、シール機で熱融着を行なう。これによ
って、電極集電体１とポリエチレンシート３とは一体化
し、電極集電体１の外周部がポリエチレンシート３で被
覆される。With reference to FIG. 1 (c), the outer circumference of the electrode current collector 1 is about 3 except the ear portion 1a for taking out the end portion.
mm, polyethylene sheet 3 (0.14 mm thickness)
Coated with. The coating method was as follows. That is, as shown in FIG. 2, the polyethylene sheet 3 is folded back at its ends, the outer periphery of the electrode current collector 1 is sandwiched between the folded back sheets, and then heat sealing is performed with a sealing machine. Thereby, the electrode current collector 1 and the polyethylene sheet 3 are integrated, and the outer peripheral portion of the electrode current collector 1 is covered with the polyethylene sheet 3.
【００１９】その後、耳１ａに導線６を結線すると正極
が得られる。負極の作製は次のように行なわれた。図３
を参照して、正極と同様の方法で、１００メッシュステ
ンレスの負極集電体（サイズ２０ｃｍ×３０ｃｍ（ただ
し、端部、耳４ａを除く））４の外周部にポリエチレン
シート３を熱融着させ一体化させた。その後、集電体の
端部、耳を除く、負極集電体の両表面にリチウム箔５
（０２ｍｍ）を圧着させた。その後、耳４ａに導線６を
結線し、負極を形成した。Then, the conductor 6 is connected to the ear 1a to obtain a positive electrode. The negative electrode was manufactured as follows. Figure 3
In the same manner as for the positive electrode, the polyethylene sheet 3 is heat-sealed to the outer peripheral portion of the negative electrode current collector (size 20 cm × 30 cm (excluding the end portion and the ear 4a)) 4 of 100 mesh stainless steel by the same method as the positive electrode. Integrated. After that, the lithium foil 5 is applied to both surfaces of the negative electrode current collector, excluding the ends and ears of the current collector.
(02 mm) was crimped. After that, the lead wire 6 was connected to the ear 4a to form a negative electrode.
【００２０】以上のようにして作製した正極と負極を、
隔膜（厚み０．３ｍｍの多孔性フィルム）を介して、順
次積層し、積層リチウム二次電池を作製した。積層リチ
ウム二次電池は、図８に示すように、両端を負極とした
構造で、負極６枚、正極５枚を積層し、形成した。その
後、両端から電極集電体に、単位面積当り１０ｇ／ｃｍ
2 の圧力をかけた状態で、正極導線と負極導線を繋ぎ合
わせ、短絡するか、どうかをテスターでチェックした。
上述の試験を１０回繰返したところ、短絡は、まったく
認められなかった。The positive electrode and negative electrode produced as described above are
A laminated lithium secondary battery was produced by sequentially laminating via a diaphragm (a porous film having a thickness of 0.3 mm). As shown in FIG. 8, the laminated lithium secondary battery was formed by laminating 6 negative electrodes and 5 positive electrodes in a structure having both ends as negative electrodes. Then, 10g / cm per unit area from both ends to the electrode current collector
With the pressure of 2 applied, the positive conductor and the negative conductor were connected, and it was checked with a tester whether or not a short circuit occurred.
When the above test was repeated 10 times, no short circuit was observed.
【００２１】比較例 正極と負極の外周部にポリエチレンシートを熱融着させ
ないで、かつ、その他の条件は同じにして、正極と負極
を作製した。同じ条件で、正極、隔膜、負極を積層し、
短絡試験を１０回繰返した。この場合、６回短絡が認め
られた。 Comparative Example A positive electrode and a negative electrode were produced under the same conditions except that the polyethylene sheet was not heat-sealed to the outer periphery of the positive electrode and the negative electrode. Under the same conditions, stack the positive electrode, diaphragm, and negative electrode,
The short circuit test was repeated 10 times. In this case, 6 short circuits were observed.
【００２２】なお、上記実施例では、正極と負極の外周
部の双方に絶縁シートを熱融着させた場合を例示した
が、この発明はこれに限られるものでなく、正極または
負極のいずれか一方の外周部を絶縁シートで被覆しても
よい。In the above embodiments, the case where the insulating sheets are heat-sealed to both the outer periphery of the positive electrode and the negative electrode is illustrated, but the present invention is not limited to this, and either the positive electrode or the negative electrode may be used. You may coat one outer peripheral part with an insulating sheet.
【００２３】また、上記実施例では、電極集電体の外周
部の、耳を除く全周にわたって絶縁シートを被覆した場
合を例示したが、この発明はこれに限られるものでな
く、一部分のみを絶縁シートで被覆してもよい。Further, in the above-mentioned embodiment, the case where the outer peripheral portion of the electrode current collector is covered with the insulating sheet over the entire circumference excluding the ears is illustrated, but the present invention is not limited to this, and only a part thereof is provided. It may be covered with an insulating sheet.
【００２４】さらに、上記実施例では電極集電体に金属
メッシュを使用する場合を例示したが、この発明はこれ
に限られるものでなく、エキスパンデドメタル、パンチ
ングメタル、多孔質金属を使用しても同様の効果を奏す
る。Furthermore, in the above embodiment, the case where a metal mesh is used for the electrode current collector has been illustrated, but the present invention is not limited to this, and expanded metal, punching metal, or porous metal is used. However, the same effect is obtained.
【００２５】さらに、上記実施例では、絶縁シートとし
て、ポリエチレンシートを用いる場合を例示したが、こ
の発明はこれに限られるものでなく、テフロン、ポリプ
ロピレン、ポリイミド、ポリエチレンテレフタレート、
ポリエーテルイミドなどを使用しても、実施例と同様の
効果を実現する。Further, in the above-mentioned embodiment, the case where the polyethylene sheet is used as the insulating sheet is exemplified, but the present invention is not limited to this, and Teflon, polypropylene, polyimide, polyethylene terephthalate,
Even if polyether imide or the like is used, the same effect as that of the embodiment can be realized.
【００２６】[0026]
【発明の効果】以上説明したとおり、この発明によれ
ば、正極集電体と負極集電体の少なくとも一方の外周部
に、該外周部に生じている刃先を覆い隠すように被覆物
を設けたので、集電体の外周部付近に刃先が立ちにくく
なる。その結果、正負両極間の短絡を防止することがで
きるようになり、積層リチウム二次電池の安全性を高め
ることができる。As described above, according to the present invention, a coating is provided on the outer peripheral portion of at least one of the positive electrode current collector and the negative electrode current collector so as to cover the cutting edge formed on the outer peripheral portion. Therefore, it is difficult for the cutting edge to stand near the outer periphery of the current collector. As a result, a short circuit between the positive and negative electrodes can be prevented, and the safety of the laminated lithium secondary battery can be improved.
【図１】本発明に用いられる正極の製造工程を示した図
である。FIG. 1 is a diagram showing a manufacturing process of a positive electrode used in the present invention.
【図２】ポリエチレンシートの斜視図である。FIG. 2 is a perspective view of a polyethylene sheet.
【図３】本発明に使用される負極の正面図である。FIG. 3 is a front view of a negative electrode used in the present invention.
【図４】発泡金属の平面図である。FIG. 4 is a plan view of foam metal.
【図５】ステンレスメッシュの平面図である。FIG. 5 is a plan view of a stainless mesh.
【図６】ステンレス製エキスパンデドメタルの平面図で
ある。FIG. 6 is a plan view of a stainless steel expanded metal.
【図７】ステンレス製パンチングメタルの平面図であ
る。FIG. 7 is a plan view of a stainless punching metal.
【図８】積層リチウム二次電池の概念図である。FIG. 8 is a conceptual diagram of a laminated lithium secondary battery.
３ ポリエチレンシート １１ 負極集電体 １２ 正極集電体 １３ 隔膜 3 polyethylene sheet 11 negative electrode current collector 12 positive electrode current collector 13 diaphragm
───────────────────────────────────────────────────── フロントページの続き (72)発明者 浜松 博光 大阪市此花区島屋一丁目１番３号 住友電 気工業株式会社大阪製作所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromitsu Hamamatsu 1-3-3 Shimaya, Konohana-ku, Osaka Sumitomo Electric Industries, Ltd. Osaka Works
Claims (1)
極集電体が順次積層されてなる積層リチウム二次電池に
おいて、 前記板状の正極集電体および前記板状の負極集電体の少
なくとも一方の外周部に、該外周部に生じている刃先を
覆い隠すように被覆物を設けた、ことを特徴とする積層
リチウム二次電池。1. A laminated lithium secondary battery in which a plate-shaped positive electrode current collector, a diaphragm, and a plate-shaped negative electrode current collector are sequentially laminated, wherein the plate-shaped positive electrode current collector and the plate-shaped negative electrode current collector are stacked. A laminated lithium secondary battery, wherein a coating is provided on at least one outer peripheral portion of the electric body so as to cover a cutting edge formed on the outer peripheral portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4043278A JPH0645005A (en) | 1992-02-28 | 1992-02-28 | Laminated lithium secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4043278A JPH0645005A (en) | 1992-02-28 | 1992-02-28 | Laminated lithium secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0645005A true JPH0645005A (en) | 1994-02-18 |
Family
ID=12659345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4043278A Withdrawn JPH0645005A (en) | 1992-02-28 | 1992-02-28 | Laminated lithium secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0645005A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006128106A (en) * | 2004-10-28 | 2006-05-18 | Samsung Sdi Co Ltd | Secondary battery |
| US12027671B2 (en) | 2019-10-02 | 2024-07-02 | Toyota Jidosha Kabushiki Kaisha | Laminated battery and production method thereof |
| US12548830B2 (en) | 2020-07-09 | 2026-02-10 | Toyota Jidosha Kabushiki Kaisha | All-solid-state battery and photocurable composition used in all-solid-state battery |
-
1992
- 1992-02-28 JP JP4043278A patent/JPH0645005A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006128106A (en) * | 2004-10-28 | 2006-05-18 | Samsung Sdi Co Ltd | Secondary battery |
| US12027671B2 (en) | 2019-10-02 | 2024-07-02 | Toyota Jidosha Kabushiki Kaisha | Laminated battery and production method thereof |
| US12548830B2 (en) | 2020-07-09 | 2026-02-10 | Toyota Jidosha Kabushiki Kaisha | All-solid-state battery and photocurable composition used in all-solid-state battery |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Application deemed to be withdrawn because no request for examination was validly filed |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 19990518 |