JPS61176054A - Flat cell - Google Patents
Flat cellInfo
- Publication number
- JPS61176054A JPS61176054A JP60014850A JP1485085A JPS61176054A JP S61176054 A JPS61176054 A JP S61176054A JP 60014850 A JP60014850 A JP 60014850A JP 1485085 A JP1485085 A JP 1485085A JP S61176054 A JPS61176054 A JP S61176054A
- Authority
- JP
- Japan
- Prior art keywords
- sealing
- battery
- hermetically
- sealing member
- resin
- 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
- 229920005989 resin Polymers 0.000 claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 28
- 238000007789 sealing Methods 0.000 claims abstract description 25
- 229920005672 polyolefin resin Polymers 0.000 claims description 9
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 4
- 238000010248 power generation Methods 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 2
- 230000008018 melting Effects 0.000 claims description 2
- 229920005992 thermoplastic resin Polymers 0.000 claims description 2
- 230000004927 fusion Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 10
- 239000003566 sealing material Substances 0.000 abstract description 8
- -1 polyethylene Polymers 0.000 abstract description 6
- 239000004698 Polyethylene Substances 0.000 abstract description 5
- 229920000573 polyethylene Polymers 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 abstract description 2
- 229920000098 polyolefin Polymers 0.000 abstract description 2
- 238000000151 deposition Methods 0.000 abstract 3
- 230000008021 deposition Effects 0.000 abstract 2
- 238000010030 laminating Methods 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- 238000003466 welding Methods 0.000 description 9
- 239000011888 foil Substances 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000011255 nonaqueous electrolyte Substances 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 2
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- WNXJIVFYUVYPPR-UHFFFAOYSA-N 1,3-dioxolane Chemical compound C1COCO1 WNXJIVFYUVYPPR-UHFFFAOYSA-N 0.000 description 1
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- JAHNSTQSQJOJLO-UHFFFAOYSA-N 2-(3-fluorophenyl)-1h-imidazole Chemical compound FC1=CC=CC(C=2NC=CN=2)=C1 JAHNSTQSQJOJLO-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 239000012298 atmosphere Substances 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011978 dissolution method Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003759 ester based solvent Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000004210 ether based solvent Substances 0.000 description 1
- 239000001530 fumaric acid Substances 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910017053 inorganic salt Inorganic materials 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- LVHBHZANLOWSRM-UHFFFAOYSA-N methylenebutanedioic acid Natural products OC(=O)CC(=C)C(O)=O LVHBHZANLOWSRM-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 description 1
- 239000008096 xylene 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
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/12—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with flat electrodes
-
- 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
-
- 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
- H01M50/184—Sealing members characterised by their shape or structure
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Sealing Battery Cases Or Jackets (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、正、負両極の電池容器と熱溶着性シール材と
により扁平な発電要素を密封する少なくとも1個の素電
池からなる扁平型電池の改良に係るものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a flat battery consisting of at least one unit cell in which a flat power generation element is sealed with a battery container for positive and negative electrodes and a heat-fusible sealing material. This is related to improvements.
従来の技術
近年、各種電子機器の多様化に伴い、電池の形状も小形
化、さらには薄形化へと多様化している。2. Description of the Related Art In recent years, with the diversification of various electronic devices, the shapes of batteries have also become smaller and thinner.
薄形化を実現するためには発電要素の構成法も重要な課
題であるが、電池あるいは素電池の密封方式も一層重要
な技術課題である。従来、円筒形電池やボタン形電池の
ように、電池容器と電池蓋との間にガスケットを介在さ
せて電池容器の開口端の内方への折りまげにより密封す
る方法では、容器や蓋、及びガスケットの肉薄化に機械
的強度の限界があり、通常1.5tWM、試作的にも1
0咽の素電池厚みが薄形化の限界とされている。そこで
、さらに電池を薄形化するための密封構造として、通称
0シートバツテリー”や”ペーパーバッテリー”と呼ば
れる電池に採用されているように、接着剤もしくは熱溶
着性樹脂により平板状もしくはフィルム状の電池容器を
密封する方法が提案さ゛れている。この際、技術的に重
要な問題点は、電池が薄形化するにつれ、正負極の極間
距離が狭くなり、両極間の絶縁が確実に維持された状態
で密封を果すことが困難であり、さらに小形、薄形の電
池となる程寸法精度の要求が厳しくなるため、これにこ
たえる寸法安定性を確保することが困難な点にあった。In order to achieve thinness, the construction method of power generation elements is an important issue, but the sealing method of batteries or unit cells is an even more important technical issue. Conventionally, in the case of cylindrical batteries and button batteries, a gasket is interposed between the battery container and the battery lid, and the opening end of the battery container is folded inward to seal the container, lid, and There is a limit to the mechanical strength due to the thinning of the gasket, and it is usually 1.5tWM, and even the prototype is 1.
The thickness of the unit cell at zero is considered to be the limit for thinning. Therefore, as a sealing structure to further reduce the thickness of the battery, a flat or film-like structure is used with adhesive or heat-fusible resin, which is used in batteries commonly called ``zero-sheet batteries'' or ``paper batteries.'' A method of sealing the battery container has been proposed.An important technical problem in this case is that as batteries become thinner, the distance between the positive and negative electrodes becomes narrower, making it difficult to ensure that the insulation between the two electrodes is maintained. Furthermore, the smaller and thinner the battery is, the more stringent the requirements for dimensional accuracy become, making it difficult to ensure dimensional stability that meets these requirements.
又、このような小形、薄形の電池の発電要素としては当
然、高エネルギー密度の系を選択すべきであり、そのた
めリチウムを負極とし、有機溶媒に無機塩を溶解した非
水電解液を用い、正極として二酸化マンガン、フッ化炭
素など各種固体活物質を用いた、いわゆる非水電解液リ
チウム電池を採用するのが最良である。Naturally, a system with high energy density should be selected as the power generating element of such a small and thin battery, and for this reason, a non-aqueous electrolyte with lithium as the negative electrode and an inorganic salt dissolved in an organic solvent is used. It is best to use a so-called non-aqueous electrolyte lithium battery using various solid active materials such as manganese dioxide and carbon fluoride as the positive electrode.
しかしこれらの非水電解液は前述のように有機溶媒、例
えばγ−ブチロラクトン、プロピレンカーボネイト、デ
ィメトキシエタン、ディオキソラン、テトラヒドロフラ
ンなどのエステル系、もしくはエーテル系の溶媒を用い
るため、シール材として用いる接着剤や熱溶着性樹脂、
さらにはガスケットなど樹脂材料は上記の溶媒に化学的
に安定なものを選択する必要があり、この条件を満すも
のとしては、ポリオレフィン系、シリコーン系。However, as mentioned above, these nonaqueous electrolytes use organic solvents, such as ester or ether solvents such as γ-butyrolactone, propylene carbonate, dimethoxyethane, dioxolane, and tetrahydrofuran, so adhesives used as sealants or heat-fusible resin,
Furthermore, it is necessary to select resin materials such as gaskets that are chemically stable in the above-mentioned solvents, and materials that meet this condition include polyolefin and silicone materials.
フッ素樹脂系などの樹脂に限定され、熱溶着性。Limited to resins such as fluororesin, heat-weldable.
気密性などの条件を付加して選択すると、ポリオレフィ
ン系樹脂が最も適切とされている。If conditions such as airtightness are added to the selection, polyolefin resins are considered to be the most appropriate.
発明が解決しようとする問題点
しかじ熱溶着の際、樹脂の軟化と加圧力により、シール
材が電池の内側及び外側に流動すると共に薄肉化するた
め、シール部において樹脂のはみ出しによる外形寸法が
不揃いで大きくなる。また、対向する正、負極端子板は
ステンレススチールなどの金属薄板の打抜き加工で形成
され、打抜き加工の際のパリなど端部の微少な変形によ
って、端子板の端部が相互に接触し、電池の短絡が発生
しやすかった。Problems to be Solved by the Invention During heat welding, the sealing material flows to the inside and outside of the battery due to the softening of the resin and the pressure applied, and the wall becomes thinner, so the outer dimensions of the sealing part are reduced due to the resin protruding. It becomes irregular and large. In addition, the opposing positive and negative terminal plates are formed by punching a thin metal plate such as stainless steel, and due to slight deformation of the edges such as burrs during the punching process, the ends of the terminal plates come into contact with each other, causing the battery Short circuits were likely to occur.
このように電池外周部の変形や電池としての短絡などの
問題は、シール材に熱溶着時に機械的強度が乏しくなり
変形する性質があることに起因し、熱溶着性と熱溶着時
の機械的強度とをシール材が兼ね備えていない点に問題
があった。Problems such as deformation of the outer periphery of the battery and short circuits in the battery are caused by the fact that the sealing material has a tendency to become deformed due to poor mechanical strength during heat welding. There was a problem in that the sealing material did not have both strength and strength.
本発明は、上記のような従来の問題点を解消し、外形が
安定し、電池としての短絡の心配もなく、しかも密封性
が良好で品質の安定した扁平型電池を提供す、ることを
目的としたものである。The present invention solves the above-mentioned conventional problems and provides a flat battery with a stable external shape, no risk of short circuit as a battery, good sealing performance, and stable quality. This is the purpose.
問題点を解決するだめの手段
この問題点を解決するため本発明は、少なくとも一個の
素電池を備え、対向する正、負一対の金属端子板と、そ
の周縁部間に介在された絶縁部材をかねた熱可塑性樹脂
からなるシール部材との熱溶着により形成された電池室
に前記素電池を内蔵して構成される扁平型電池において
、シール部材を正、負の端子板に対して広い面積で接す
るポリオレフィン系樹脂を主体とした基体と、この基体
の内外両側に積層配置した溶着温度忙おいて基体よりも
高い溶融粘度を有するカルボキシル基含有ポリオレフィ
ン系樹脂との3層構造としたものである。Means for Solving the Problem In order to solve this problem, the present invention includes at least one unit cell, a pair of opposing positive and negative metal terminal plates, and an insulating member interposed between the peripheral edges thereof. In a flat battery configured by incorporating the unit cell in a battery chamber formed by heat welding with a sealing member made of solid thermoplastic resin, the sealing member is provided with a large area relative to the positive and negative terminal plates. It has a three-layer structure consisting of a base mainly made of a polyolefin resin in contact with the base, and a carboxyl group-containing polyolefin resin that has a higher melt viscosity than the base at a welding temperature and is laminated on both the inside and outside of this base.
作 用
この構成によれば、シール部材の溶着時の変形が少ない
状態で密封性よく溶着する為に、シール材のうち、溶着
部の正負極端子板に対してその電池内面側および外部側
に、溶着温度において溶融粘度の高い樹脂層を設け、シ
ール部材の芯となる基体には溶融粘度の比較的低い樹脂
層を設けている。従ってこれKより、密封性が良好で、
シール部材の変形が少ない電池の密封を可能とし、保存
特性の向上に極めて役立つこととなる。According to this configuration, in order to weld the seal member with good sealing properties with little deformation during welding, the seal material is applied to the inside and outside of the battery with respect to the positive and negative terminal plates of the welded part. A resin layer having a high melt viscosity at the welding temperature is provided, and a resin layer having a relatively low melt viscosity is provided on the base body serving as the core of the sealing member. Therefore, the sealing performance is better than this K,
This makes it possible to seal a battery with little deformation of the sealing member, which is extremely useful for improving storage characteristics.
実施例
第1図は、本発明の一実施例の扁平型電池を示す。図中
1は負極集電体および容器の一部をかねた負極端子板で
ステンレススチール箔からなる。Embodiment FIG. 1 shows a flat battery according to an embodiment of the present invention. In the figure, reference numeral 1 denotes a negative electrode terminal plate which also serves as a negative electrode current collector and a part of the container, and is made of stainless steel foil.
この負極端子板の内面にはリチウム箔からなる負極2が
圧着されている。3はポリプロピレン不織布製セパレー
タ、4は二酸化マンガンにフッ素樹脂粉末とアセチレン
ブラックを混合して練合し、所定の厚みに圧延、乾燥し
て成形した正極合剤層であり、導電性塗膜5上に構成す
る。6は正極集電体および容器の一部をかねた正極端子
板でステンレススチールの箔からなる。対向する一対の
負極および正極端子板1,6の周縁部間には窓枠状に加
工された変性ポリエチレン製シール材7が介在し、加圧
および加熱によりシール部材7を端子板1,6の周縁部
に溶着し、発電要素が内蔵された電池室を密封している
。A negative electrode 2 made of lithium foil is crimped onto the inner surface of this negative electrode terminal plate. 3 is a separator made of polypropylene nonwoven fabric, 4 is a positive electrode mixture layer formed by mixing manganese dioxide, fluororesin powder, and acetylene black, rolling it to a predetermined thickness, and drying it. Configure. Reference numeral 6 denotes a positive terminal plate made of stainless steel foil and serving as a positive electrode current collector and a part of the container. A modified polyethylene sealing material 7 processed into a window frame shape is interposed between the peripheral edges of a pair of opposing negative and positive electrode terminal plates 1 and 6, and the sealing material 7 is moved between the terminal plates 1 and 6 by pressure and heating. It is welded to the periphery and seals the battery chamber containing the power generation element.
シール部材7の材質は通常、耐溶媒性の良いポリオレフ
ィン系樹脂のうち、溶着温度において溶融粘度の高い樹
脂層7′を、これよりも溶融粘度の低い芯となる基体7
“の内外両側に積層して3層構造に複合化したものであ
る。The material of the sealing member 7 is usually a resin layer 7' made of a polyolefin resin with good solvent resistance, which has a high melt viscosity at the welding temperature, and a core base 7 with a lower melt viscosity than the resin layer 7'.
It is a three-layer composite structure that is laminated on both the inside and outside of the ``.
ここで基体7“となる樹脂は、その内外両側に積層して
いる樹脂よりも通常10〜30’C以上低い融点、又は
軟化点を有し、比較的低い温度で速やかに端子板に溶着
すると同時に、金属への接着効果を増すためにカルホキ
キル基を含有させたものを用いるのが好ましい。例えば
、エチレン又はプロピレン単量体にアクリル酸、メタク
リル酸、イタコン酸、フマル酸、マレイン酸、無水マレ
イン酸などの不飽和カルボン酸を共重合又はグラフト重
合させてえられるものである。The resin that forms the base 7" has a melting point or softening point that is usually 10 to 30'C lower than the resin laminated on both the inside and outside of the base, and can be quickly welded to the terminal board at a relatively low temperature. At the same time, it is preferable to use a product containing a calphokyl group to increase the adhesion effect to metals.For example, ethylene or propylene monomers containing acrylic acid, methacrylic acid, itaconic acid, fumaric acid, maleic acid, maleic anhydride, etc. It is obtained by copolymerizing or graft polymerizing unsaturated carboxylic acids such as acids.
一方、正、負極方向に対し上記、芯材となる基体の内外
両側に積層される樹脂層は、基体と同種の樹脂でかつ接
着温度において基体よりも高い溶融粘度を有し、基体樹
脂と同様、金属との接着効果を増すためカルボキシル基
を含有する。On the other hand, the resin layers laminated on both the inner and outer sides of the base material serving as the core material in the positive and negative electrode directions are made of the same type of resin as the base material and have a higher melt viscosity than the base material at the bonding temperature, and are similar to the base resin. , contains a carboxyl group to increase the adhesion effect with metals.
なおここで言う溶融粘度は、通常のポリエチレンメルト
インデックスと同様の測定方法において、接着温度で、
内外に積層されている両側の樹脂は1.5以下、好まし
くは0.6以下で、基体樹脂との差が1.0以上である
ことが必要である。The melt viscosity referred to here is measured at the bonding temperature using the same measurement method as the normal polyethylene melt index.
It is necessary that the resins on both sides laminated inside and outside have a density of 1.5 or less, preferably 0.6 or less, and a difference from the base resin of 1.0 or more.
上記のシール部材を構成するポリオレフィン系゛樹脂の
組み合わせは種々考えられるも、その中で特に基体とし
て、平均分子量が粘度法で100万以上又は光散乱法で
300万以上の超高分子量ポリエチレンシート及び熱キ
シレン溶解法で測定したゲル分率が少くとも50%以上
、好ましくは70%以上の架橋ポリエチレンシートを使
用することで、シール部の流動による薄肉化を有効にふ
せぐことか可能であり、かつポリオレフィン系樹脂本来
の不活性で水分透過の少ない性質が生かされ、非水電解
液電池用シール部材として最も好ましい。Various combinations of polyolefin resins can be considered for the above-mentioned sealing member, but among them, ultra-high molecular weight polyethylene sheets with an average molecular weight of 1 million or more as determined by the viscosity method or 3 million or more as determined by the light scattering method and By using a crosslinked polyethylene sheet with a gel fraction of at least 50% or more, preferably 70% or more, as measured by hot xylene dissolution method, it is possible to effectively prevent thinning of the seal portion due to flow, and It is most preferable as a sealing member for nonaqueous electrolyte batteries because it takes advantage of the inherent inert and low moisture permeation properties of polyolefin resins.
第1図において、7はシール部材でポリエチレン製基体
7“と、基体7“の内外両側に積層された樹脂層7′か
らなり、それぞれはポリエチレンに無水マレイン酸を5
%重合させてカルボキシル基を含有させたものである。In FIG. 1, 7 is a sealing member consisting of a polyethylene base 7'' and a resin layer 7' laminated on both the inner and outer sides of the base 7''.
% polymerized to contain carboxyl groups.
基体7“の軟化点は、約150℃の熱接着に適している
。なお基体7〃釦積層された内外両側の樹脂層7′の軟
化点は、約170℃を有し基体7“より高密度のポリエ
チレンからなっている。電池の形状は厚さO−50rt
rm 、外形30X30mmで、厚み的にステンレスス
チール箔1,6は30μ、シール材の基体7は300μ
、内外両側の樹脂層7′は60μである。第1図の7−
Aの各シール部を見て明らかなよう釦、本発明を適用し
た第1図の場合、溶着の際の接着温度及び加圧に対して
基体7“の両側(4−ある積層樹脂層7′は殆んど変形
することなく所定の形状を維持し、しかも基体樹脂層7
”とステンレススチール箔からなる端子板1゜eとの熱
溶着も確実に行われている。従って、電池形状も一定化
し、ステンレススチール箔からなる端子板1,6相互間
の接触による電池短絡もなく、さらに、基体7“と両側
の樹脂7′及び端子板1゜6の相互間の密着も強固なの
で、耐漏液性及び保存性能がすぐれている。The softening point of the base 7'' is approximately 150°C, which is suitable for thermal bonding.The softening point of the resin layers 7' on both the inner and outer sides of the button laminated on the base 7 is approximately 170°C, which is higher than that of the base 7''. Made of high density polyethylene. The shape of the battery is O-50rt thick.
rm, the outer diameter is 30 x 30 mm, the thickness of the stainless steel foils 1 and 6 is 30μ, and the thickness of the sealing material base 7 is 300μ.
, the resin layers 7' on both the inner and outer sides have a thickness of 60μ. 7- in Figure 1
As is clear from looking at each seal part of the button A, in the case of the button shown in FIG. maintains a predetermined shape with almost no deformation, and the base resin layer 7
” and the terminal plate 1゜e made of stainless steel foil are reliably thermally welded. Therefore, the shape of the battery is also constant, and short circuits of the battery due to contact between the terminal plates 1 and 6 made of stainless steel foil are also prevented. Moreover, since the base body 7'', the resin 7' on both sides, and the terminal plate 1.degree. 6 are in close contact with each other, the leakage resistance and storage performance are excellent.
次に、前記従来の技術を用いて構成した扁平型電池をA
、本実施例によるものをBとして、それぞれの内部抵抗
と、耐漏液性能を製造直後(r)と、60℃に4週間保
存後<ff)の条件下で測定した所、次表のとおりであ
った。Next, a flat battery constructed using the above-mentioned conventional technology was
The internal resistance and leakage resistance of each sample were measured immediately after manufacture (r) and after storage at 60°C for 4 weeks (<ff), with the product according to this example designated as B, and the results are as shown in the following table. there were.
また、これらA、B2種類の電池を、60℃で4週間保
存後、eaKΩの負荷抵抗をつなぎ、20℃雰囲気下で
放電させた時の放電特性を、第2図に示す。Further, FIG. 2 shows the discharge characteristics of these two types of batteries, A and B, when they were stored at 60° C. for 4 weeks, connected to a load resistance of eaKΩ, and discharged in an atmosphere of 20° C.
発明の効果
以上詳述したように本発明は溶着による密封性がよく、
溶着時の変形も少ないシール部材を、異なった性質のポ
リオレフィン系樹脂層を複合一体化して用いることによ
り、密封性がよく、外形形状の一定した、短絡すること
のない扁平型電池を提供するものである。Effects of the Invention As detailed above, the present invention has good sealing properties by welding,
By using a sealing member that is less deformed during welding by combining and integrating polyolefin resin layers with different properties, a flat battery with good sealing performance, a constant external shape, and no short circuit is provided. It is.
第1図は本発明の実施例における扁平型電池の断面図、
第2図はその放電特性図である。
1・・・・・・負極端子板、2・・・・・・負極、3・
・・・・・セパレータ、4・・・・・・正極合剤、6・
・・・・・導電性塗膜、6・・・・・・正極端子板、7
・・・・・・シール部材、7″・・・・・・シール部材
の基体(ポリエチレン)、7′・・・・・・シール部材
の両側樹脂層、7−A・・・・・・シール部。
代理人の氏名 弁理士 中 尾 敏 男 ほか1名”’
−−−4シ財1
第2図
特続m!rM(ar)FIG. 1 is a cross-sectional view of a flat battery in an embodiment of the present invention;
FIG. 2 is a diagram of its discharge characteristics. 1...Negative electrode terminal plate, 2...Negative electrode, 3.
...Separator, 4...Positive electrode mixture, 6.
... Conductive coating film, 6 ... Positive terminal plate, 7
... Seal member, 7'' ... Seal member base (polyethylene), 7' ... Resin layer on both sides of seal member, 7-A ... Seal Department. Name of agent: Patent attorney Toshio Nakao and one other person”'
---4 goods 1 Figure 2 Special m! rM(ar)
Claims (1)
兼ねた熱可塑性樹脂製の窓枠状シール部材を熱接着して
形成された電池室に、発電要素を内蔵して構成される扁
平型電池であって、前記シール部材が、ポリオレフィン
系樹脂を主体とした基体と、この基体の内外両側に前記
基体よりも高い溶融温度を有するカルボキシル基含有ポ
リオレフィン系樹脂を主体とする樹脂層を熱融着によっ
て積層して一体化したものである扁平型電池。A flat battery chamber that houses a power generation element in a battery chamber formed by thermally bonding a window frame-shaped sealing member made of thermoplastic resin that also serves as an insulating member to the periphery of the battery containers of the opposing positive and negative electrodes. type battery, wherein the sealing member heats a base body mainly made of a polyolefin resin, and resin layers mainly made of a carboxyl group-containing polyolefin resin having a melting temperature higher than that of the base body on both the inner and outer sides of the base body. A flat battery that is laminated and integrated by fusion bonding.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60014850A JPS61176054A (en) | 1985-01-29 | 1985-01-29 | Flat cell |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP60014850A JPS61176054A (en) | 1985-01-29 | 1985-01-29 | Flat cell |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS61176054A true JPS61176054A (en) | 1986-08-07 |
Family
ID=11872510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP60014850A Pending JPS61176054A (en) | 1985-01-29 | 1985-01-29 | Flat cell |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS61176054A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02220351A (en) * | 1989-02-20 | 1990-09-03 | Fuji Elelctrochem Co Ltd | Paper cell |
JPH0380964U (en) * | 1989-12-09 | 1991-08-19 | ||
JPH04106867A (en) * | 1990-08-24 | 1992-04-08 | Yuasa Corp | Thin battery |
JPH04167351A (en) * | 1990-10-30 | 1992-06-15 | Shin Kobe Electric Mach Co Ltd | Sealed battery |
WO1993003504A1 (en) * | 1991-08-09 | 1993-02-18 | Yuasa Corporation | Thin battery |
WO2015198737A1 (en) * | 2014-06-25 | 2015-12-30 | Nok株式会社 | Thermoplastic adhesive sheet |
GB2578486A (en) * | 2018-09-28 | 2020-05-13 | Sumitomo Chemical Co | Flexible battery |
-
1985
- 1985-01-29 JP JP60014850A patent/JPS61176054A/en active Pending
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02220351A (en) * | 1989-02-20 | 1990-09-03 | Fuji Elelctrochem Co Ltd | Paper cell |
JPH0380964U (en) * | 1989-12-09 | 1991-08-19 | ||
JPH04106867A (en) * | 1990-08-24 | 1992-04-08 | Yuasa Corp | Thin battery |
JPH04167351A (en) * | 1990-10-30 | 1992-06-15 | Shin Kobe Electric Mach Co Ltd | Sealed battery |
WO1993003504A1 (en) * | 1991-08-09 | 1993-02-18 | Yuasa Corporation | Thin battery |
US5378557A (en) * | 1991-08-09 | 1995-01-03 | Yuasa Corporation | Film type battery |
WO2015198737A1 (en) * | 2014-06-25 | 2015-12-30 | Nok株式会社 | Thermoplastic adhesive sheet |
JPWO2015198737A1 (en) * | 2014-06-25 | 2017-04-20 | Nok株式会社 | Thermoplastic adhesive sheet |
GB2578486A (en) * | 2018-09-28 | 2020-05-13 | Sumitomo Chemical Co | Flexible battery |
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