JPS6255865A - Thin lithium cell - Google Patents
Thin lithium cellInfo
- Publication number
- JPS6255865A JPS6255865A JP60194160A JP19416085A JPS6255865A JP S6255865 A JPS6255865 A JP S6255865A JP 60194160 A JP60194160 A JP 60194160A JP 19416085 A JP19416085 A JP 19416085A JP S6255865 A JPS6255865 A JP S6255865A
- Authority
- JP
- Japan
- Prior art keywords
- hot melt
- melt adhesive
- electrode plate
- 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.)
- 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
- 239000004831 Hot glue Substances 0.000 claims abstract description 42
- 229920000098 polyolefin Polymers 0.000 claims abstract description 18
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920005601 base polymer Polymers 0.000 claims abstract description 8
- 239000003792 electrolyte Substances 0.000 abstract description 12
- 238000007789 sealing Methods 0.000 abstract description 10
- 239000010410 layer Substances 0.000 abstract description 8
- -1 polyethylene Polymers 0.000 abstract description 8
- 239000002904 solvent Substances 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- 239000000654 additive Substances 0.000 abstract description 2
- 239000003963 antioxidant agent Substances 0.000 abstract description 2
- 239000004014 plasticizer Substances 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 230000000996 additive effect Effects 0.000 abstract 1
- 239000012943 hotmelt Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 10
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 10
- 230000001070 adhesive effect Effects 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229920001155 polypropylene Polymers 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 239000005486 organic electrolyte Substances 0.000 description 2
- CFJRPNFOLVDFMJ-UHFFFAOYSA-N titanium disulfide Chemical compound S=[Ti]=S CFJRPNFOLVDFMJ-UHFFFAOYSA-N 0.000 description 2
- SBUOHGKIOVRDKY-UHFFFAOYSA-N 4-methyl-1,3-dioxolane Chemical compound CC1COCO1 SBUOHGKIOVRDKY-UHFFFAOYSA-N 0.000 description 1
- 229910001290 LiPF6 Inorganic materials 0.000 description 1
- 229920003354 Modic® Polymers 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 150000001638 boron Chemical class 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical group C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin 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
- 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
- H01M50/183—Sealing members
-
- 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
- H01M50/183—Sealing members
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明はホットメルト接着剤で絶縁封止した薄形リチ
ウム電池に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a thin lithium battery insulated and sealed with a hot melt adhesive.
厚さが１．Ｏａｎ以下、特に厚さが０．７ｍｍ以下の薄
形リチウム電池では、厚さに制約を受ける関係上、合成
樹脂製の封口体を金属容器の開口端部のかしめにより封
口板に圧接させて封口する封止方法が採用できないため
、発電要素を正極板と負極板との間に介在させ、発電要
素の周縁部外方で正極板の周縁部と負極板の周縁部とを
ホットメルト接着剤で接着して、正ｉＦｉと負極板とを
絶縁しつつ封止する構造が採用されている。The thickness is 1. For thin lithium batteries with a thickness of less than Oan, especially 0.7 mm or less, due to thickness restrictions, a synthetic resin sealing body is pressed against the sealing plate by caulking the open end of the metal container to seal it. Since the sealing method cannot be adopted, the power generating element is interposed between the positive electrode plate and the negative electrode plate, and the peripheral edge of the positive electrode plate and the peripheral edge of the negative electrode plate are bonded with hot melt adhesive outside the peripheral edge of the power generating element. A structure is adopted in which the positive iFi and negative electrode plates are insulated and sealed by adhesion.
そして、この絶縁封止に使用するホットメルト接着剤と
して、従来は、エチレン−酢酸ビニル共重合体をベース
ポリマーとする接着剤が用いられていた（たとえば特開
昭５９−１０３２８０号公報）。As a hot melt adhesive used for this insulation sealing, an adhesive having an ethylene-vinyl acetate copolymer as a base polymer has conventionally been used (for example, Japanese Patent Application Laid-Open No. 103280/1983).
ところが、上記エチレン−酢酸ビニル共重合体をベース
ポリマーとするホットメルト接着剤は、接着性は良好で
あるものの、耐ガス透過性が悪く、封止後に電池外部の
水分が上記ホットメルト接着剤層を透過して電池内部に
侵入し、リチウムと反応して、電池の内部抵抗を増加さ
せ、また、電解凍中の電解液溶媒が上記ホットメルト接
着剤層を透過して電池内部から電池外部へ抜は出して、
電解液量が減少し、正負極間に液絡のない部分が生じて
内部抵抗が増加するなど、ＴＬ池性能の低下を引、き起
こすという問題があった。However, although hot melt adhesives using the ethylene-vinyl acetate copolymer as a base polymer have good adhesive properties, they have poor gas permeation resistance, and after sealing, moisture from outside the battery can leak into the hot melt adhesive layer. It penetrates into the battery and reacts with lithium, increasing the internal resistance of the battery.Also, the electrolyte solvent during electrolyzing passes through the hot melt adhesive layer and goes from the inside of the battery to the outside of the battery. Take out the excerpt,
There have been problems in that the amount of electrolyte decreases, a portion without a liquid junction occurs between the positive and negative electrodes, and internal resistance increases, resulting in a decrease in TL cell performance.
また、上記エチレン−酢酸ビニル共重合体系のホットメ
ルト接着剤は、耐有機溶剤性が劣り、有機系の電解液を
用いる場合には、耐電解液性での面でも問題があり、し
かも融点が８０℃程度と低く、高温下での電池使用には
通さないという問題もあった。In addition, the hot melt adhesive based on the ethylene-vinyl acetate copolymer has poor organic solvent resistance, and when an organic electrolyte is used, there are problems in terms of electrolyte resistance, and the melting point is low. Another problem was that it was as low as 80°C, making it impervious to battery use at high temperatures.
この発明は上述した従来技術の問題点を解決するもので
、上記薄形リチウム電池における正極板と負極板との絶
縁封止に使用するホットメルト接着剤として、無水マレ
イン酸を置換基として有する変性ポリオレフィンをペー
スポリマーとするホットメルト接着剤を用いることによ
って、目的を達成したものである。The present invention solves the problems of the prior art described above, and uses a modified hot melt adhesive having maleic anhydride as a substituent as a hot melt adhesive used for insulating sealing between the positive electrode plate and the negative electrode plate in the thin lithium battery. This objective was achieved by using a hot melt adhesive with polyolefin as the base polymer.
すなわち、上記の無水マレイン酸を置換基として有する
変性ポリオレフィンをペースポリマートするホットメル
ト接着剤は、後記の第２表に示すように、接着力が従来
使用のエチレン−酢酸ビニル共重合体系のホットメルト
接着剤と同等以上であり、しかも耐ガス透過性が優れて
いて、後記の第１表に示す結果からも明らかなように、
電池外部の水分が該接着剤層を透過して電池内部に侵入
することが少なく、かつ電池内部から電解液溶媒が電池
外部へ抜は出ていくことも少ない。In other words, as shown in Table 2 below, the hot-melt adhesive in which the above-mentioned modified polyolefin having maleic anhydride as a substituent is used as a paste polymer has an adhesive strength higher than that of the conventionally used ethylene-vinyl acetate copolymer-based hot melt adhesive. It is equivalent to or better than melt adhesives, and has excellent gas permeation resistance, as is clear from the results shown in Table 1 below.
Moisture from outside the battery rarely penetrates into the battery through the adhesive layer, and electrolyte solvent from inside the battery rarely leaks out to the outside of the battery.
また、上記無水マレイン酸を置換基として有する変性ポ
リオレフィンをべ、−スボリマーとするホットメルト接
着剤は、融点が約１００−１７０℃で、従来使用のエチ
レン−酢酸ビニル共重合体系ホ・ノドメルト接着剤に比
べて高温下での使用が安定しており、しかも後記の第２
表に示すように電気絶縁性も従来使用のエチレン−酢酸
ビニル共重合体系接着剤とほぼ同程度の絶縁性を有して
いる。In addition, the hot-melt adhesive containing the above-mentioned modified polyolefin having maleic anhydride as a substituent as base-suborimer has a melting point of about 100-170°C, and is different from the conventionally used ethylene-vinyl acetate copolymer type hot-melt adhesive. It is more stable in use at high temperatures than the
As shown in the table, the electrical insulation properties are approximately the same as those of conventionally used ethylene-vinyl acetate copolymer adhesives.
本発明において、無水マレイン酸を置換基として有する
変性ポリオレフィンをベースポリマーとするホットメル
ト接着剤とは、上記変性ポリオレフィンを主材料にし、
これに粘着仕上剤、可塑剤、酸化防止剤などの添加剤を
適宜添加したもの、あるいは上記変性ポリオレフィンの
みで構成したホットメルト接着剤をいう。なお、上記変
性ポリオレフィンの主鎖となるポリオレフィンは、通常
、ポリエチレン、ポリプロピレン、エチレン−プロピレ
ン共重合体などである。In the present invention, a hot melt adhesive whose base polymer is a modified polyolefin having maleic anhydride as a substituent refers to a hot melt adhesive whose base polymer is a modified polyolefin having maleic anhydride as a substituent;
It refers to a hot melt adhesive to which additives such as an adhesive finishing agent, a plasticizer, and an antioxidant are appropriately added, or a hot melt adhesive composed only of the above-mentioned modified polyolefin. The polyolefin that forms the main chain of the modified polyolefin is usually polyethylene, polypropylene, ethylene-propylene copolymer, or the like.
上記のような無水マレイン酸を置換基として有する変性
ポリオレフィン系ホットメルト接着剤としては、たとえ
ば三菱油化（株）からＭＯＤＩＣの商品名でメルトフロ
ーレートの異なる数種のものが市販されており、目的に
応じて適したものを使用することができ、たとえば三菱
油化（株）製のＭＯＤＩＣＰ−３００Ｆ、ＭＯＤＩＣＰ
−１００Ｆ、 ＭＯＤＩＣＨ−１００Ｆ Ｃいずれもメ
ルトフローレー） １ ｇ／１０ｍ１ｎ ） 、ＭＯＤ
Ｉ ＣＬ−１００Ｆ （メルトフローレート１．５ｇ
／ｌ抛ｉｎ）などが本発明において特に好適に使用され
る。As the above-mentioned modified polyolefin hot melt adhesive having maleic anhydride as a substituent, for example, several types of adhesives with different melt flow rates are commercially available from Mitsubishi Yuka Co., Ltd. under the trade name MODIC. A suitable one can be used depending on the purpose; for example, MODICP-300F, MODICP manufactured by Mitsubishi Yuka Co., Ltd.
-100F, MODICH-100F C (Both melt flow rate) 1 g/10m1n), MOD
I CL-100F (melt flow rate 1.5g
/l抛in) etc. are particularly preferably used in the present invention.
つぎに本発明の実施例を図面に基づいて説明す図面は本
発明の薄形リチウム電池の一実施例を模式的に示す断面
図であり、図中、１は正極板で、厚さ０．０３ｍｍのス
テンレス鋼板を用いて容器状に形成したものであり、鍔
部１ａの幅は２１１Ｉｌで、中央の凹部の深さは０．３
＋ａ＋であり、平面形状が１６．５ｍｌｌＸ３４．５ｍ
ｍの長方形に形成されている。２は負極板で、厚さ０．
０５ａ＋ｍのステンレス鋼板からなり、平板状でその平
面形状は１６＋ｓ＋ａ Ｘ ３４＋ａ＋ｉの長方形状を
している。３は正極で、二硫化チタン（Ｔｉ３２）を活
物質とする合剤を加圧成形して厚さ０．２ｍｍで、７Ｘ
２５＋ｎｍに形成したものである。４はセパレータで、
このセパレータ４は微孔性ポリプロピレンフィルムとポ
リプロピレン不織布を積み重ねてなり、微孔性ポリプロ
ピレンフィルムが主たるセパレータ機能を発揮し、ポリ
プロピレン不織布は正極３側に配置され、主として電解
液吸収体として働く。５は負極で、厚さ０．０５ｍｍで
、７ｍｍＸ２５開の正方形状のリチウム板によって構成
されている。電解液には４−メチル−１，３−ジオキソ
ラン６０容量％、１．２−ジメトキシエタン３４．８容
量％およびヘキサメチルホスホリックトリアミド５８２
容量％からなる混合溶媒にＬｉＰＦ６を１．０ ｍｏｌ
／ ｌ熔解した有機電解質溶液が使用されている。６は
ホットメルト接着剤であり、このホットメルト接着剤６
は無水マレイン酸を置換基として有する変性ボ。Next, an embodiment of the present invention will be explained based on the drawings. The drawing is a cross-sectional view schematically showing an embodiment of the thin lithium battery of the present invention, and in the figure, 1 is a positive electrode plate with a thickness of 0. It is formed into a container shape using a 0.3 mm stainless steel plate, the width of the flange 1a is 211 Il, and the depth of the central recess is 0.3 mm.
+a+, the planar shape is 16.5ml x 34.5m
It is formed into a rectangle of m. 2 is a negative electrode plate with a thickness of 0.
It is made of 05a+m stainless steel plate, and its planar shape is rectangular with 16+s+a x 34+a+i. 3 is a positive electrode, which is made by pressure molding a mixture containing titanium disulfide (Ti32) as an active material, has a thickness of 0.2 mm, and is 7X.
It is formed to have a thickness of 25+ nm. 4 is a separator,
This separator 4 is made by stacking a microporous polypropylene film and a polypropylene nonwoven fabric, and the microporous polypropylene film performs the main separator function, and the polypropylene nonwoven fabric is placed on the positive electrode 3 side and mainly works as an electrolyte absorber. Reference numeral 5 denotes a negative electrode, which is composed of a 7 mm x 25 square lithium plate with a thickness of 0.05 mm. The electrolyte contains 60% by volume of 4-methyl-1,3-dioxolane, 34.8% by volume of 1,2-dimethoxyethane, and 582% by volume of hexamethylphosphoric triamide.
1.0 mol of LiPF6 in a mixed solvent consisting of volume%
/l molten organic electrolyte solution is used. 6 is a hot melt adhesive;
is a modified boron having maleic anhydride as a substituent.
リオレフィンをベースポリマーとするホットメルト接着
剤（商品名、三菱油化（株）製ＭＯＤＩＣＰ−３００Ｆ
、メルトフローレートｌ ｇ ／１０ ｗｉｎ、）であ
って、前述のごとき発電要素の周縁部外方、つまり、正
極板ｌの周縁部に当たる鍔部１ａと負極板２の周縁部と
を接着して、正極板１と負極板２とを絶縁しつつ、両者
の間の間隙を封止している。そして、上記ホットメルト
接着剤６は、電池の作製にあたっては、約３０μ園のフ
ィルム状に形成したものが用いられ、それをリング状に
打ち抜いて、正極板１の鍔部１ａと負極板２の周縁部に
それぞれ予備接着しておき、正極板１に発電要素を収納
したのち、正極板１の鍔部１ａに予備接着しておいたホ
ットメルト接着剤と負極板２の周縁部に予備接着してお
いたホットメルト接着剤とを５ ｋｇ／ ｃｄの加圧下
で１８０℃に１０秒間加熱して接着することによって図
示のような状態にされている・上記実施例の電池と、ホ
７）メルト接着剤として１従来使用のエチレン−酢酸ビ
ニル共重合体系ホットメルト接着剤を用いたほかは実施
例と同様に製造した薄形リチウム電池を６０℃、無加湿
の条件下および６０℃、相対湿度９０％の条件下でそれ
ぞれ２０日間貯蔵し、内部抵抗増加量を測定した結果を
第１表に示す、なお、両電池とも初度の内部抵抗はいず
れも５０Ωであったー。Hot melt adhesive using lyolefin as a base polymer (product name, MODICP-300F manufactured by Mitsubishi Yuka Co., Ltd.)
, melt flow rate l g /10 win,), and the outside of the periphery of the power generating element as described above, that is, the flange 1a corresponding to the periphery of the positive electrode plate l and the periphery of the negative electrode plate 2 are bonded together. , while insulating the positive electrode plate 1 and the negative electrode plate 2, sealing the gap between them. The hot-melt adhesive 6 is formed into a film with a thickness of approximately 30 μm and is used in the production of the battery, and is punched out into a ring shape to attach the flange 1a of the positive electrode plate 1 and the negative electrode plate 2. After preliminarily gluing the power generation elements to the periphery of the positive electrode plate 1, preliminarily adhere the hot melt adhesive preliminarily applied to the flange 1a of the positive electrode plate 1 to the periphery of the negative electrode plate 2. The battery of the above example and E7) Melt are heated to 180°C for 10 seconds under a pressure of 5 kg/cd to form the state shown in the figure. 1 Thin lithium batteries manufactured in the same manner as in the example except that a conventionally used ethylene-vinyl acetate copolymer hot melt adhesive was used as the adhesive were heated at 60°C under non-humidified conditions and at 60°C with a relative humidity of 90°C. Table 1 shows the results of measuring the amount of increase in internal resistance after storage for 20 days under conditions of 20%.The initial internal resistance of both batteries was 50Ω.
また、両電池の負極板に使用されている厚さ５０μ−の
ステンレス鋼板（ＳＵＳ３０４）に、実！例の電池に使
用された無水マレイン酸を置換基として有する変性ポリ
オレフィン系ホットメルト接着剤と従来電池に使用され
たエチレン−酢酸ビニル共重合体系ホットメルト接着剤
を、それぞれ厚さ３０μ−のフィルム状で予備接着した
のち、同種接着剤同士を５ｋｇ／ａｄの加圧下、１８０
℃で１０秒間加熱して熱接着し、冷却後、ＪＩＳ Ｋ
６８５４に準じ、Ｔ字剥離試験を行った結果ならびに剥
離試験前のステンレス鋼板間の抵抗を測定した結果を第
２表に示す。In addition, the 50μ-thick stainless steel plate (SUS304) used for the negative electrode plate of both batteries has a real! A modified polyolefin hot melt adhesive having maleic anhydride as a substituent used in the example battery and an ethylene-vinyl acetate copolymer hot melt adhesive used in a conventional battery were each used in the form of a 30μ-thick film. After preliminary gluing with
Heat for 10 seconds at ℃ for thermal bonding, and after cooling, JIS K
Table 2 shows the results of a T-peel test conducted in accordance with 6854 and the results of measuring the resistance between the stainless steel plates before the peel test.
第１表
第２表
※ｌ：Ａ−無水マレイン酸を置換基として有する変性ポ
リオレフィン系ホットメル
ト接着剤
※２：Ｂ＝エチレンー酢酸ビニル共ｍ合体系ホットメル
ト接着剤
第１表に示すように、本発明の電池は従来電池に比べて
、６０℃、無加湿の条件下での貯蔵ならびに６０℃、相
対湿度９０％の条件下での貯蔵において内部抵抗増加が
少なく、電解液溶媒がホットメルト接着剤層を透過して
電池内部から電池外部へ抜は出てい（、ことが少なく、
かつ電池外部の水分がホットメルト接着剤層を透過して
電池内部に侵入することが少ないことが明らかにされた
。Table 1 Table 2 *l: A - Modified polyolefin hot melt adhesive having maleic anhydride as a substituent *2: B = Ethylene-vinyl acetate co-m combination hot melt adhesive As shown in Table 1, Compared to conventional batteries, the battery of the present invention exhibits less increase in internal resistance when stored at 60°C in the absence of humidification and when stored at 60°C and 90% relative humidity, and the electrolyte solvent is hot-melt adhesive. There is no leakage from the inside of the battery to the outside of the battery through the agent layer (rarely,
It was also revealed that moisture outside the battery rarely penetrates the hot melt adhesive layer and enters the inside of the battery.
また、第２表に示すように、本発明の電池に用いた無水
マレイン酸を置換基として有する変性ポリオレフィン系
ホットメルト接着剤は、従来使用のエチレン−酢酸ビニ
ル共重合体系ホットメルト接着剤と同等の接着力および
絶縁性を有している。Furthermore, as shown in Table 2, the modified polyolefin hot melt adhesive having maleic anhydride as a substituent used in the battery of the present invention is equivalent to the conventionally used ethylene-vinyl acetate copolymer hot melt adhesive. It has adhesive strength and insulation properties.
なお、実施例では、発電要素として・正極３・セパレー
タ４、負極５および電解液からなるものを用いたが、発
電要素は正極、固体電解質、負極からなるものでもよい
。In the example, a power generation element consisting of a positive electrode 3, a separator 4, a negative electrode 5, and an electrolyte was used, but the power generation element may also be formed of a positive electrode, a solid electrolyte, and a negative electrode.
以上説明したように、本発明では、無水マレイン酸を置
換基として有する変性ポリオレフィン系ホットメルト接
着剤を薄形リチウム電池の絶縁封止に用いることによっ
て、電池外部の水分がホットメルト接着剤層を透過して
電池内部に侵入するのを防止すると共に、電解液溶媒が
ホットメルト接着剤層を透過して電池外部に抜は出すの
を防止して、貯蔵特性が良好で、かつ封止強度や絶縁性
の低下のない薄形リチウム電池を提供することができた
。As explained above, in the present invention, by using a modified polyolefin hot melt adhesive having maleic anhydride as a substituent for insulation sealing of a thin lithium battery, moisture outside the battery can be absorbed by the hot melt adhesive layer. It prevents the electrolyte solvent from permeating the hot melt adhesive layer and entering the inside of the battery, and also prevents the electrolyte solvent from permeating the hot melt adhesive layer and leaking out to the outside of the battery, resulting in good storage characteristics and high sealing strength. It was possible to provide a thin lithium battery with no deterioration in insulation properties.
図面は本発明の薄形リチウム電池の一例を示す断面図で
ある。
１・・・正極板、 ２・・・負極板、・３・・・正極、
４・・・セパレータ、 ５・・・負極、 ６・・・ホッ
トメルト接着剤The drawing is a sectional view showing an example of the thin lithium battery of the present invention. 1...Positive electrode plate, 2...Negative electrode plate, 3...Positive electrode,
4...Separator, 5...Negative electrode, 6...Hot melt adhesive
Claims (2)
電要素の周縁部外方で正極板と負極板とをホットメルト
接着剤で接着して、正極板と負極板とを絶縁すると共に
封止した薄形リチウム電池において、上記ホットメルト
接着剤のベースポリマーが無水マレイン酸を置換基とし
て有する変性ポリオレフィンであることを特徴とする薄
形リチウム電池。(1) The power generating element is interposed between the positive electrode plate and the negative electrode plate, and the positive electrode plate and the negative electrode plate are bonded with hot melt adhesive outside the periphery of the power generating element to insulate the positive electrode plate and the negative electrode plate. 1. A thin lithium battery in which the base polymer of the hot melt adhesive is a modified polyolefin having maleic anhydride as a substituent.
が容器状であることを特徴とする特許請求の範囲第１項
記載の薄形リチウム電池。(2) The thin lithium battery according to claim 1, wherein either one of the positive electrode plate and the negative electrode plate is flat and the other is container-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60194160A JPS6255865A (en) | 1985-09-02 | 1985-09-02 | Thin lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60194160A JPS6255865A (en) | 1985-09-02 | 1985-09-02 | Thin lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6255865A true JPS6255865A (en) | 1987-03-11 |
Family
ID=16319919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60194160A Pending JPS6255865A (en) | 1985-09-02 | 1985-09-02 | Thin lithium cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6255865A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01239759A (en) * | 1988-03-18 | 1989-09-25 | Hitachi Maxell Ltd | Thin lithium battery |
| EP0975031A1 (en) * | 1998-02-05 | 2000-01-26 | Dai Nippon Printing Co., Ltd. | Sheet for cell case and cell device |
| WO2003007401A1 (en) * | 2001-07-09 | 2003-01-23 | Hitachi Maxell, Ltd. | Battery |
| WO2015115080A1 (en) * | 2014-01-30 | 2015-08-06 | 三洋電機株式会社 | Sealed storage battery |
| CN110146528A (en) * | 2019-04-23 | 2019-08-20 | 天能电池集团股份有限公司 | A kind of anti-oxidation battery terminal negative board processing method |
| CN111171768A (en) * | 2020-02-12 | 2020-05-19 | 上海紫江新材料科技股份有限公司 | Preparation method of binder applied to dry process of aluminum plastic film for lithium battery |
-
1985
- 1985-09-02 JP JP60194160A patent/JPS6255865A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01239759A (en) * | 1988-03-18 | 1989-09-25 | Hitachi Maxell Ltd | Thin lithium battery |
| US8323828B2 (en) | 1997-10-14 | 2012-12-04 | Dai Nippon Printing Co., Ltd. | Battery case forming sheet and battery packet |
| EP0975031A1 (en) * | 1998-02-05 | 2000-01-26 | Dai Nippon Printing Co., Ltd. | Sheet for cell case and cell device |
| EP0975031A4 (en) * | 1998-02-05 | 2001-11-21 | Dainippon Printing Co Ltd | Sheet for cell case and cell device |
| US6632538B1 (en) | 1998-02-05 | 2003-10-14 | Dai Nippon Printing Co., Ltd. | Sheet for cell and cell device |
| US8455135B2 (en) | 1998-02-05 | 2013-06-04 | Dai Nippon Printing Co., Ltd. | Battery case forming sheet and battery packet |
| WO2003007401A1 (en) * | 2001-07-09 | 2003-01-23 | Hitachi Maxell, Ltd. | Battery |
| US7524578B2 (en) | 2001-07-09 | 2009-04-28 | Hitachi Maxell, Ltd. | Battery comprising a flange formed at a peripheral edge and a protection circuit attached to the flange |
| EP1416550A4 (en) * | 2001-07-09 | 2008-04-16 | Hitachi Maxell | Battery |
| EP1416550A1 (en) * | 2001-07-09 | 2004-05-06 | Hitachi Maxell, Ltd. | Battery |
| WO2015115080A1 (en) * | 2014-01-30 | 2015-08-06 | 三洋電機株式会社 | Sealed storage battery |
| JPWO2015115080A1 (en) * | 2014-01-30 | 2017-03-23 | 三洋電機株式会社 | Sealed storage battery |
| US9685642B2 (en) | 2014-01-30 | 2017-06-20 | Sanyo Electric Co., Ltd. | Sealed storage battery |
| CN110146528A (en) * | 2019-04-23 | 2019-08-20 | 天能电池集团股份有限公司 | A kind of anti-oxidation battery terminal negative board processing method |
| CN111171768A (en) * | 2020-02-12 | 2020-05-19 | 上海紫江新材料科技股份有限公司 | Preparation method of binder applied to dry process of aluminum plastic film for lithium battery |
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