JPS603867A - Flat type battery - Google Patents

Abstract

PURPOSE:To obtain a flat type battery which is suitable for mass production, has compact size, an open circuit voltage of 3V, and good high rate discharge performance by stacking electroconductive plastic films whose each film has a negative mix coating layer on its one side and a positive mix coating layer on the other side. CONSTITUTION:A laminated film 1 of aluminium foil which also serves as a positive terminal and an electroconductive film on which positive active material coating layer 2 is formed, and a electroconductive plastic film 4 having a negative mix coating layer 5 on its one side and a positive mix coating layer 2 on the other side, and a laminated film 6 of aluminium foil which also serves as a negative terminal, and an electroconductive film on which a negative mix coating layer 5 is formed are stacked so that the positive electrode and negative electrode are mutually placed, with an electrolyte absorbent material 3 interposed, and their peripheries are sealed by heat-sealing.

Description

【発明の詳細な説明】 〈産業上の利用分野〉 本発明は薄型の小型電子機器に用いる平板型電池に関す
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a flat plate battery used in thin and small electronic devices.

〈従来技術〉 近年、電卓、マイコン、カメラ、ラジオ、ゲーム付クロ
ック等の小型電子機器が小型化、薄型化の方向に進んで
いる。<Prior Art> In recent years, small electronic devices such as calculators, microcomputers, cameras, radios, game clocks, etc. are becoming smaller and thinner.

しかしながら、これら機器は外観形状が四角いものであ
るが、四角形の薄型電池が市販されていないのが実情で
ある。However, although these devices have a rectangular external shape, the reality is that rectangular thin batteries are not commercially available.

また、プリンター付電卓、ラジオ、小型液晶テレビ等は
電卓、腕時計、ゲーム付クロックの消費電流１〜１０μ
Ａに比べる消費電流が１０〜１００ｍＡと大きく、現在
、市販されているボタン型電池、コイン型電池では電極
面積が小さいのでパワー不足で対応できない。In addition, the current consumption of calculators with printers, radios, small LCD TVs, etc. is 1 to 10μ.
The current consumption is large at 10 to 100 mA compared to A, and currently commercially available button-type batteries and coin-type batteries cannot cope with this because of their small electrode area due to insufficient power.

また、従来知られているインスタントカメラ用の平板型
電池（ポラロイド社、ポラパルスＰ１００）は縦１００
ｍｍ．横９０間と大きく、かつ電池電圧６Ｖと高く汎用
性がない。In addition, the conventionally known flat plate battery for instant cameras (Polaroid, Polapulse P100) has a vertical
mm. It is large with a width of 90 mm, and the battery voltage is high at 6 V, so it is not versatile.

すすわち、キャッシュ・カードサイズ（縦８５ｍｍ、横
５４ｍｍ）のようなコンパクトなサイズで、汎用性のあ
る電池電圧３Ｖを有し、放電電流が１０〜１００ｍＡ取
出せる電池が実用化されていない。In other words, a battery that is as compact as a cash card (height: 85 mm, width: 54 mm), has a versatile battery voltage of 3 V, and can discharge a discharge current of 10 to 100 mA has not been put into practical use.

また、従来の平板型電池は正極合剤もしくは負極合剤中
に分散剤やバインダー等を添加、含有しているので、塗
布性能は向上するけれども、電池内部抵抗がアップして
、放電特性が悪くなる欠点を有していた。In addition, conventional flat plate batteries contain dispersants, binders, etc. in the positive electrode mixture or negative electrode mixture, which improves the coating performance, but increases the internal resistance of the battery and deteriorates the discharge characteristics. It had some drawbacks.

〈発明の目的〉 本発明は、上記欠点を除くもので、コンパクトなサイズ
で、電池電圧３Ｖの大電流放電特性に優れた新規なる平
板型電池を提供するものである。<Objective of the Invention> The present invention eliminates the above-mentioned drawbacks, and provides a novel flat plate battery that is compact in size and has excellent large current discharge characteristics with a battery voltage of 3V.

〈実施例〉 以下、本発明を実施例により説明する。<Example> The present invention will be explained below with reference to Examples.

第１図は本発明電池の実施例を示す断面図である。FIG. 1 is a sectional view showing an embodiment of the battery of the present invention.

図中１は正極端子を兼ねる正極シートで厚みが０．０５
ｍｍのアルミニウム箔と、厚みが０．０６ｍｍの導電性
プラスチックフィルムとガラミネートされたものである
。アルミニウム泊面が外側で、導電性プラスチックフィ
ルムが内側に配置されている。２は正極シート１の導電
性プラスチックフィルム面に塗布された正極合剤である
。この正極合剤２はＭｎＯ２１６重量部、アセチレンブ
ラック７重量部、電解液７７重量部からなる混合スラリ
ーを３５ｍｍ×７０ｍｍに４．５ｇを塗布して乾燥した
ものである。この正極合剤２はバインダーを含有しない
にもかかわらず、導電性プラスチックフィルムに良好に
塗布が可能であった。In the figure, 1 is a positive electrode sheet that also serves as a positive electrode terminal, and its thickness is 0.05.
It is made of aluminum foil with a thickness of 0.06 mm and a conductive plastic film with a thickness of 0.06 mm. The aluminum surface is on the outside and a conductive plastic film is placed on the inside. 2 is a positive electrode mixture applied to the conductive plastic film surface of the positive electrode sheet 1. This positive electrode mixture 2 was obtained by applying 4.5 g of a mixed slurry consisting of 216 parts by weight of MnO, 7 parts by weight of acetylene black, and 77 parts by weight of an electrolyte to a 35 mm x 70 mm area and drying it. Although this positive electrode mixture 2 did not contain a binder, it could be well applied to a conductive plastic film.

電解液は水６２％、ＺｎＣｌ２２８％、ＮＨ４Ｃｌ７％
、ＺｎＯ１％、ＨｇＣｌ２２％である。Electrolyte is 62% water, 228% ZnCl, 7% NH4Cl
, ZnO 1%, HgCl 22%.

３は合成樹脂不織布からなるセパレータを兼ねる電解液
含浸材（厚み０．１４０ｍｍ）でその外周部３ａにホッ
トメルト樹脂が含浸及び塗布されている。Reference numeral 3 is an electrolyte-impregnated material (thickness 0.140 mm) made of synthetic resin non-woven fabric which also serves as a separator, and its outer peripheral portion 3a is impregnated and coated with hot melt resin.

４は厚み０．０６ｍｍの漕電性プラスチックフィルムで
あり、片面に正極合剤２、もう一方の面に負極合剤５が
塗布されている。Reference numeral 4 denotes an electrostatic plastic film having a thickness of 0.06 mm, with a positive electrode mixture 2 coated on one side and a negative electrode mixture 5 coated on the other side.

負極合剤５は亜鉛末７４重量部、ヒドロキシエチルセル
ロース１５重量部及び前記電解液２５．５重量部からな
るスラリー０．２５９を、３５ｍｍ×７０ｍｍに塗布し
たのち乾燥させｋものである。６は負極端子を兼ねる、
負極シートであり、厚み０．０５闘アルミニウム箔と、
厚み０．０６ｍ導電性フィルムとがラミネートされたも
のである。６は電池の外面にアルミニウム箔、内面に導
電性プラスチックフィルムを配置している。Negative electrode mixture 5 was prepared by applying a slurry of 0.259 mm consisting of 74 parts by weight of zinc powder, 15 parts by weight of hydroxyethyl cellulose, and 25.5 parts by weight of the electrolytic solution to a size of 35 mm x 70 mm, and then drying it. 6 also serves as a negative terminal,
The negative electrode sheet is made of aluminum foil with a thickness of 0.05 mm,
It is laminated with a 0.06 m thick conductive film. 6, an aluminum foil is placed on the outside of the battery, and a conductive plastic film is placed on the inside.

またこの負極シート６の内面に、負極合剤５が塗布され
ている。Further, a negative electrode mixture 5 is applied to the inner surface of this negative electrode sheet 6.

図には示されてないが電池組立段階で２％のヒドロキシ
エチルセルロースが添加された電解液カ各正極合剤２の
上面に０．７ｃｃ塗布されている。Although not shown in the figure, 0.7 cc of an electrolytic solution to which 2% hydroxyethyl cellulose was added was applied to the upper surface of each positive electrode mixture 2 during the battery assembly stage.

最後に、正極シート１の外周部１ａ、セパレータ３の外
周部４ａ、負極シート６の外周部６ａを同時に上下方向
より加熱シールにて完全溶着することにより電池を密封
化する。Finally, the outer periphery 1a of the positive electrode sheet 1, the outer periphery 4a of the separator 3, and the outer periphery 6a of the negative electrode sheet 6 are completely welded simultaneously from above and below by heat sealing to seal the battery.

〈発明の効果〉 以上、詳述した如く、本発明の特徴は、電池の構成が単
純な積み重ね方式であるため量産性に適した平板型電池
である。<Effects of the Invention> As detailed above, the present invention is characterized by a flat plate battery suitable for mass production because the battery structure is a simple stacking method.

正、負極端子を兼ねる正、負極シート１及び６がアルミ
ニウム箔と導電性プラスチックフィルムでラミネートさ
れているため、電池内部の電解液が導を性プラスチック
フィルムを透過して減少してしまうことがない。Since the positive and negative electrode sheets 1 and 6, which also serve as positive and negative electrode terminals, are laminated with aluminum foil and conductive plastic film, the electrolyte inside the battery will not be reduced by passing through the conductive plastic film. .

従って、長期間保存しても電池特性が良好に保たれる。Therefore, good battery characteristics are maintained even after long-term storage.

また、電池周辺部にホットメルト樹脂を用いてヒート・
シールを行っているので、耐漏液性に優ぐれている。In addition, hot melt resin is used around the battery to heat the area.
Since it is sealed, it has excellent leakage resistance.

次に、本発明電池（８５×５４Ｘ３．０ｍｍ、公称容量
１５０ｍＡｈ）の放電特性を調べた。その結果を第２図
のグラフに示す。Next, the discharge characteristics of the battery of the present invention (85 x 54 x 3.0 mm, nominal capacity 150 mAh) were investigated. The results are shown in the graph of FIG.

第２図は本発明電池と２個直列のアルカリマンガン電池
ＬＲ４４（外径１１．６ｍｍ、高さ５．４ｍｍ、公称容
量１００ｍＡｈ）の負荷抵抗２００Ωでの放電特性を比
較して示すグラフである。FIG. 2 is a graph showing a comparison of the discharge characteristics of the battery of the present invention and two alkaline manganese batteries LR44 (outer diameter 11.6 mm, height 5.4 mm, nominal capacity 100 mAh) at a load resistance of 200Ω.

図中、Ａは本発明電池、Ｂはアルカリマンガン電池であ
る。In the figure, A is a battery of the present invention and B is an alkaline manganese battery.

図中より明らかなように、本発明電池社現在実用されて
いる小型電池の中で牛も高率放電に適したＬＲ４４より
もさらに高率で長期間放電することができた。、これは
本発明の正極合剤２の中に電池反応に不要なバインダー
が添加されていないためと思われる。As is clear from the figure, the Cow was able to discharge at a higher rate and for a longer period of time than the LR44, which is suitable for high rate discharge among the small batteries currently in use by Invention Battery. This is probably because no binder unnecessary for the battery reaction is added to the positive electrode mixture 2 of the present invention.

さらに、本発明電池（ｎ＝１００個）を温度６０℃、相
対湿度９０〜９５％で、２０日間貯蔵したのち、ヒート
・シールされた電池周辺部からの漏液を調べた所、漏液
の発生は皆無であった。Furthermore, after storing the batteries of the present invention (n = 100 pieces) for 20 days at a temperature of 60°C and a relative humidity of 90-95%, leakage from the periphery of the heat-sealed battery was investigated. There were no outbreaks.

本漏液試験は室温で２年貯蔵した試験に相当することが
、本発明者の知見から得られている。The present inventor's findings have shown that this liquid leakage test is equivalent to a test stored at room temperature for 2 years.

また、本発明電池がこのように耐漏液性に優れる理由と
して、上述したように、導電性プラスチックフィルムと
電解液含浸材の周縁部に含浸、塗布されているホットメ
ルト樹脂同志がヒートシールにより完全に溶着されてい
るため、電池内の電解液が外部に漏液しないものと思わ
れる。In addition, the reason why the battery of the present invention has such excellent leakage resistance is that, as mentioned above, the hot melt resin impregnated and applied to the periphery of the conductive plastic film and the electrolyte-impregnated material is completely sealed by heat sealing. It is thought that the electrolyte inside the battery will not leak to the outside because it is welded to the battery.

さらに、本発明電池の電解液は２％ヒドロキシエチルセ
ルロースが添加されて相当の粘性（１３５ｃｐｓ）が付
与されているため、液の流動性を低くする仁とができ、
耐漏液性向上に効を奏しているものと推定される。Furthermore, the electrolytic solution of the battery of the present invention has 2% hydroxyethyl cellulose added to give it considerable viscosity (135 cps), which creates a layer that reduces the fluidity of the solution.
It is presumed that this is effective in improving leakage resistance.

以上詳述したように、本発明はコンパクトなキャッシュ
カードサイズで、電池電圧３Ｖの大電流放電に適した平
板型電池を提供することができ、プリンター付電卓、小
型マイコン、ラジオ、小型液晶ＴＶ等の電源として最適
であり、その工業的価値が著しく大なるものである。As described in detail above, the present invention can provide a flat plate battery that is compact in cash card size and suitable for large current discharge with a battery voltage of 3V, and can be used for calculators with printers, small microcomputers, radios, small LCD TVs, etc. It is most suitable as a power source, and its industrial value is extremely large.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明電池の断面図、第２図は本発明電池とＬ
Ｒ４４２個直列電池の放電特性を比較して示すグラフで
ある。 １・・・正極シート　１ａ・・正極シートの外周部、２
・・正極合剤、３・・電解液含浸材、３ａ・・電解液含
浸材の外周部、４・・導電性プラスチックフィルム、４
ａ・・導電性プラスチックフィルムの外周部、５・・負
極合剤、６・・負極シール、６ａ・・負極シートの外周
部。 以　上 出願人　株式会社第二精工舎 代理人　弁理士最　上　務Fig. 1 is a sectional view of the battery of the present invention, and Fig. 2 is a cross-sectional view of the battery of the present invention.
It is a graph showing a comparison of discharge characteristics of two R44 batteries connected in series. 1... Positive electrode sheet 1a... Outer periphery of positive electrode sheet, 2
...Positive electrode mixture, 3.. Electrolyte impregnated material, 3a.. Outer periphery of electrolyte solution impregnated material, 4.. Conductive plastic film, 4
a: outer periphery of conductive plastic film, 5: negative electrode mixture, 6: negative electrode seal, 6a: outer periphery of negative electrode sheet. Applicant Daini Seikosha Co., Ltd. Agent Patent Attorney Mogami

Claims (5)

【特許請求の範囲】[Claims] （１）導電性プラスチックフィルム面に正極活物質塗布
層を設けた正極端子を兼ねるアルミニウム箔とのラミネ
ートフィルム、片面に負極合剤塗布層を、反対面に正極
合剤塗布層を設けた導電性プラスチックフィルム、導電
性プラスチックフィルム面に負極合剤塗布層を設けた負
極端子を兼ねるアルミニウム箔とのラミネートフィルム
が電解液含浸材を介在せしめて、正、負極交互になるよ
うに載置、積層され、外周部をヒートシールにて完全封
止されたことを特徴とする平板型電池。(1) Laminated film with aluminum foil that also serves as a positive electrode terminal with a positive electrode active material coating layer on the conductive plastic film surface, conductive with a negative electrode mixture coating layer on one side and a positive electrode mixture coating layer on the other side. A plastic film, a laminate film with an aluminum foil that also serves as a negative electrode terminal with a negative electrode mixture coating layer on the conductive plastic film surface is placed and laminated with an electrolyte impregnated material so that the positive and negative electrodes alternate. , a flat plate battery characterized by having its outer periphery completely sealed by heat sealing. （２）前記正極合剤塗布層が電解二酸化マンガン、アセ
チレンブラック及び塩化亜鉛、塩化アンモニウム、酸化
亜鉛、塩化第二水銀を含む電解液からなることを特徴と
する特許請求の範囲第１項記載の平板型電池。(2) The positive electrode mixture coating layer is made of an electrolytic solution containing electrolytic manganese dioxide, acetylene black, and zinc chloride, ammonium chloride, zinc oxide, and mercuric chloride. Flat battery. （３）前記負極合剤塗布層が亜鉛粉末、塩化亜鉛、塩化
アンモニウム、酸化亜鉛及び塩化第二水銀を含む電解液
もしくは１〜３％のヒドロキシエチルセルロースを添加
した電解液からなることを特徴とする特許請求の範囲第
１項もしくは第２項記載の平板型電池。(3) The negative electrode mixture coating layer is characterized by comprising an electrolytic solution containing zinc powder, zinc chloride, ammonium chloride, zinc oxide, and mercuric chloride, or an electrolytic solution to which 1 to 3% of hydroxyethyl cellulose is added. A flat plate battery according to claim 1 or 2. （４）前記電解液含浸材の周辺部にホットメルト樹脂が
予め含浸、塗布されていることを特徴とする特許請求の
範囲第１項、第２項もしくは第３項記載の平板型電池。(4) The flat plate battery according to claim 1, 2 or 3, wherein a peripheral portion of the electrolyte-impregnated material is pre-impregnated and coated with a hot melt resin. （５）電池寸法が縦８５ｍｍ、横５４ｍｍで、電池電圧
３Ｖ、電池容量１５０ｍＡｈを有することを特徴とする
第１項、第２項、第３項もしくは第４項記載の平板型電
池。(5) The flat plate battery according to item 1, 2, 3, or 4, characterized in that the battery has dimensions of 85 mm in length and 54 mm in width, a battery voltage of 3 V, and a battery capacity of 150 mAh.