JPH0378745B2 - - Google Patents
Info
- Publication number
- JPH0378745B2 JPH0378745B2 JP57194089A JP19408982A JPH0378745B2 JP H0378745 B2 JPH0378745 B2 JP H0378745B2 JP 57194089 A JP57194089 A JP 57194089A JP 19408982 A JP19408982 A JP 19408982A JP H0378745 B2 JPH0378745 B2 JP H0378745B2
- Authority
- JP
- Japan
- Prior art keywords
- battery
- sealing
- insulating material
- plate
- current collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000007789 sealing Methods 0.000 claims description 23
- 239000011810 insulating material Substances 0.000 claims description 12
- 229920013716 polyethylene resin Polymers 0.000 claims description 6
- 238000010248 power generation Methods 0.000 claims description 4
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000011149 active material Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000005486 organic electrolyte Substances 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229920006242 ethylene acrylic acid copolymer Polymers 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920006122 polyamide resin Polymers 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- MXNUCYGENRZCBO-UHFFFAOYSA-M sodium;ethene;2-methylprop-2-enoate Chemical compound [Na+].C=C.CC(=C)C([O-])=O MXNUCYGENRZCBO-UHFFFAOYSA-M 0.000 description 1
- 239000007784 solid electrolyte Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical compound FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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 of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the 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 of a single cell or a single battery
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
-
- 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 of a single cell or a single battery
- 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
Description
産業上の利用分野
本発明は、集電体を兼ねる２枚の封口板間に発
電要素を収納し、周縁部を絶縁材で密封した扁平
形電池に関するもので、特にリチウムなどの活性
軽金属を負極に用いる電池に関する。
従来例の構成とその問題点
扁平形電池を封口する方法としては、機械的に
かしめて封口する方法が一般的である。かしめ封
口の方法は、封口板の周辺部にリング状のガスケ
ツトを嵌着させ、発電要素を封口板に入れた後、
正極缶と組み合わせ、正極缶の開口部を内方へ締
め付けて、合成樹脂製リング状のガスケツトを圧
縮させた状態にある封口方法である。この封口方
法によると、電池の厚みは0.9mm程度が限度で、
これ以上薄くすることはできない。
電池の薄形化には、正極集電板および負極集電
板の２枚の封口板の間に発電要素を挾持させ、周
縁部を絶縁材で密封する方法が適している。この
場合、絶縁材としてセラミツクを用いることが知
られているが、セラミツクと封口板との接着には
ロウ付けを必要とするため、溶着時には250℃以
上の温度となり、活物質を損傷する欠点を有して
いる。
一方、２枚の封口板の周縁部の間の絶縁材を合
成樹脂にすることは、有機物であるため、気体や
水蒸気の透過が起こり、長期保存中に劣化する不
都合がある。特に、リチウムなどの活性軽金属を
負極活物質とする有機電解質電池や固体電解質電
池においては、リチウムと水蒸気が反応して、水
素ガスが発生して電池内圧が生じ、その結果不良
となる欠点を持つていた。
上記の絶縁材として用いる合成樹脂の中で、特
に金属封口板と接着するものとして、エポキシ樹
脂、ポリアミド樹脂、エチレン−酢酸ビニル共重
合樹脂、エチレン−アクリル酸共重合樹脂、アイ
オノマー樹脂、ポリエチレン樹脂、その他アタク
チツクポリプロピレン樹脂などのホツトメルト材
が知られている。これらの材料は、200℃以下で
接着可能であるが、電池中の電解液、特に有機電
解質によつておかされるか、水蒸気の流入によつ
て電池活物質に影響を及ぼすか、又は金属封口板
との接着力が弱いかの欠点を有していた。
発明の目的
本発明は、前記のように、集電板を兼ねる２枚
の封口板に発電要素を密封する構成の扁平形電池
において、樹脂絶縁材を改良して保存性能を向上
することを目的とする。
発明の構成
本発明は、絶縁材として、無水マレイン酸変性
ポリエチレン樹脂を用いることを特徴とする。
実施例の説明
図面はリチウムを負極とする有機電解質電池を
示す。
１は正極集電板を兼ねるステンレス鋼製封口
板、２は負極集電板を兼ねるニツケル製封口板で
あり、これらの封口板の厚さは30〜100μm程度で
ある。３は封口板１の内面に接触させた正極合剤
で、フツ化炭素に導電材の黒鉛とバインダのフツ
素樹脂を混合して成形したものである。４は負極
側封口板２の内面に接触させた負極のリチウムシ
ートである。５は正極合剤３と負極４との間に介
在させたポリプロピレンの不織布からなるセパレ
ータで、γ−ブチロラクトンにホウフツ化リチウ
ムを１モル／の割合で溶解した電解液を含浸さ
せてある。
６は封口板１，２間の周縁部を密封する絶縁材
で、無水マレイン酸変性ポリエチレン樹脂からな
る。無水マレイン酸変性ポリエチレン樹脂は、厚
さ約0.3〜0.7mmのものであり、この樹脂と封口板
１，２との接着方法は、熱板圧着法、インパルス
接着法、超音波接着法のいずれでもよい。熱板圧
着法の場合、温度190℃で３〜10Kg／cm2の圧力を
３〜５秒加えることによつて接着することができ
る。
次表は、上記のような大きさ40×30mm、厚さ
0.7mmの電池Ａ、絶縁材として他の樹脂を用いた
電池Ｂ〜Ｄ、及びポリプロピレンをガスケツトと
してかしめ封口した厚さ２mm、直径20mmのコイン
形電池Ｅについて、温度60℃、相対湿度90％のも
とで３カ月間保存後の放電容量の初期値に対する
残存率の比較を示す。
INDUSTRIAL APPLICATION FIELD The present invention relates to a flat battery in which a power generation element is housed between two sealing plates that also serve as current collectors, and the periphery is sealed with an insulating material. Related to batteries used for. Structure of conventional example and its problems A common method for sealing a flat battery is to mechanically caulk the battery. The caulking method involves fitting a ring-shaped gasket around the periphery of the sealing plate, inserting the power generation element into the sealing plate, and then
In this sealing method, a synthetic resin ring-shaped gasket is compressed by combining it with a positive electrode can and tightening the opening of the positive electrode can inward. According to this sealing method, the thickness of the battery is limited to about 0.9 mm.
It cannot be made any thinner. A suitable method for making the battery thinner is to sandwich the power generating element between two sealing plates, a positive electrode current collector plate and a negative electrode current collector plate, and seal the periphery with an insulating material. In this case, it is known to use ceramic as an insulating material, but since brazing is required to bond the ceramic and the sealing plate, the temperature at the time of welding exceeds 250℃, which has the disadvantage of damaging the active material. have. On the other hand, using synthetic resin as the insulating material between the peripheral edges of the two sealing plates has the disadvantage that, since it is an organic material, gas and water vapor permeate through it, resulting in deterioration during long-term storage. In particular, organic electrolyte batteries and solid electrolyte batteries that use active light metals such as lithium as negative electrode active materials have the disadvantage that lithium and water vapor react, generating hydrogen gas and creating internal battery pressure, resulting in defects. was. Among the synthetic resins used as the above-mentioned insulating materials, those that particularly adhere to the metal sealing plate include epoxy resins, polyamide resins, ethylene-vinyl acetate copolymer resins, ethylene-acrylic acid copolymer resins, ionomer resins, polyethylene resins, Other hot melt materials such as atactic polypropylene resin are also known. Although these materials can be bonded at temperatures below 200°C, they may be heated by the electrolyte in the battery, especially organic electrolytes, may have an effect on the battery active material due to the inflow of water vapor, or may be exposed to metal sealants. The drawback was that the adhesion to the board was weak. Purpose of the Invention The purpose of the present invention is to improve storage performance by improving the resin insulating material in a flat battery having a structure in which a power generation element is sealed between two sealing plates that also serve as current collector plates, as described above. shall be. Structure of the Invention The present invention is characterized in that a maleic anhydride-modified polyethylene resin is used as an insulating material. DESCRIPTION OF THE EMBODIMENTS The drawings show an organic electrolyte battery with lithium as the negative electrode. 1 is a stainless steel sealing plate that also serves as a positive electrode current collector plate, and 2 is a nickel sealing plate that also serves as a negative electrode current collector plate, and the thickness of these sealing plates is about 30 to 100 μm. 3 is a positive electrode mixture which is brought into contact with the inner surface of the sealing plate 1, and is formed by mixing carbon fluoride with graphite as a conductive material and fluororesin as a binder. 4 is a lithium sheet of the negative electrode that is brought into contact with the inner surface of the negative electrode side sealing plate 2. Reference numeral 5 denotes a separator made of a polypropylene nonwoven fabric interposed between the positive electrode mixture 3 and the negative electrode 4, and is impregnated with an electrolytic solution in which lithium borofluoride is dissolved in γ-butyrolactone at a ratio of 1 mol/mol. Reference numeral 6 denotes an insulating material that seals the peripheral edge between the sealing plates 1 and 2, and is made of maleic anhydride-modified polyethylene resin. The maleic anhydride-modified polyethylene resin has a thickness of about 0.3 to 0.7 mm, and the method of adhering this resin to the sealing plates 1 and 2 can be any of hot plate pressure bonding, impulse bonding, and ultrasonic bonding. good. In the case of hot plate bonding, bonding can be achieved by applying a pressure of 3 to 10 kg/cm 2 for 3 to 5 seconds at a temperature of 190°C. The following table shows the size 40 x 30 mm and thickness as shown above.
Battery A of 0.7 mm, batteries B to D using other resins as insulators, and coin-shaped battery E with a thickness of 2 mm and diameter of 20 mm, sealed by caulking polypropylene as a gasket, were tested at a temperature of 60°C and a relative humidity of 90%. A comparison of the residual rate with respect to the initial value of discharge capacity after storage for 3 months is shown below.
【表】
表に示されるように、絶縁材として無水マレイ
ン酸変性ポリエチレン樹脂を用いた電池Ａは、他
の樹脂を用いた電池Ｂ〜Ｄより保存後の放電容量
の残存率が優れ、また0.7mmと薄形にしたにもか
かわらず、かしめ封口による電池Ｅよりも優れて
いる。
発明の効果
以上のように、本発明によれば、密封時の加熱
温度が200℃程度でよいので高温加熱による活物
質の損傷もなく、保存性に優れたごく薄形の電池
を得ることができる。[Table] As shown in the table, battery A using maleic anhydride-modified polyethylene resin as the insulating material has a higher residual discharge capacity after storage than batteries B to D using other resins, and has a discharge capacity of 0.7 Despite being made as thin as mm, it is superior to Battery E, which has a caulked seal. Effects of the Invention As described above, according to the present invention, since the heating temperature at the time of sealing is only about 200°C, there is no damage to the active material due to high temperature heating, and it is possible to obtain an extremely thin battery with excellent storage stability. can.
図面は本発明による電池の縦断面図である。
１，２……封口板、３……正極合剤、４……負
極、５……セパレータ、６……絶縁材。
The drawing is a longitudinal cross-sectional view of a battery according to the invention. 1, 2... Sealing plate, 3... Positive electrode mixture, 4... Negative electrode, 5... Separator, 6... Insulating material.
Claims (1)
ねる封口板との間に発電要素を収納し、両封口板
の周縁を絶縁材で密封した扁平形電池であつて、
前記絶縁材が無水マレイン酸変性ポリエチレン樹
脂であることを特徴とする扁平形電池。1. A flat battery in which a power generation element is housed between a sealing plate that also serves as a positive electrode current collector plate and a sealing plate that also serves as a negative electrode current collector plate, and the peripheries of both sealing plates are sealed with an insulating material,
A flat battery characterized in that the insulating material is a maleic anhydride-modified polyethylene resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57194089A JPS5983340A (en) | 1982-11-04 | 1982-11-04 | Flat battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57194089A JPS5983340A (en) | 1982-11-04 | 1982-11-04 | Flat battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5983340A JPS5983340A (en) | 1984-05-14 |
| JPH0378745B2 true JPH0378745B2 (en) | 1991-12-16 |
Family
ID=16318764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57194089A Granted JPS5983340A (en) | 1982-11-04 | 1982-11-04 | Flat battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5983340A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2783832B2 (en) * | 1989-03-06 | 1998-08-06 | 富士電気化学株式会社 | Paper battery |
| JPH0434837A (en) * | 1990-05-30 | 1992-02-05 | Matsushita Electric Ind Co Ltd | Enclosed battery |
| KR101509376B1 (en) * | 2011-05-12 | 2015-04-14 | 세이코 인스트루 가부시키가이샤 | Electrochemical cell |
| WO2017047717A1 (en) * | 2015-09-17 | 2017-03-23 | 凸版印刷株式会社 | Exterior material for lithium ion battery |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57187861A (en) * | 1981-05-13 | 1982-11-18 | Fuji Elelctrochem Co Ltd | Flat battery and manufacturing method therefor |
-
1982
- 1982-11-04 JP JP57194089A patent/JPS5983340A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57187861A (en) * | 1981-05-13 | 1982-11-18 | Fuji Elelctrochem Co Ltd | Flat battery and manufacturing method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5983340A (en) | 1984-05-14 |
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