JPS60216440A - Flat type cell - Google Patents

Abstract

PURPOSE:To prevent contact between a positive and a negative electrode charge collector at the time of sealing, by providing thermosetting resin layers at the peripheral parts of said positive and negative electrode charge collector on which a flat voltaic element is arranged, and arranging a thermoadhesive resin between said two thermosetting resin layers and then heating and pressing said peripheral parts. CONSTITUTION:A positive and a negative electrode charge collector 1, 2 hold a voltaic element from its both sides, which is composed of a positive electrode layer 4 and a negative electrode layer 5, between both layers of which a separator 3 involving electrolyte is positioned at the central part of them. Besides, a thermosetting resin layer 7c made of epoxy resin or the like is provided on each facing single face of the peripheral parts of the positive and negative electrode charge collector 1, 2, arranging a termoadhesive resin 7a between said two thermosetting resin layers and then that part is sealed liquid-tight by heating and pressing and thus a flat type cel is formed. Therefore, as the displacement of the thermoadhesive resin 7a can be prevented at the time of heating and pressing, any contact can not occur at the end parts of the positive and negative electrode charge collector 1, 2 and the reliability of the cell can be improved.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、正、負極集電体間に扁平な発電要素を配設し
、画集電体の周縁部を熱溶着性樹脂で絶縁密封した扁平
形電池に関するものである〇２ベン 従来例の構成とその問題点 扁平形電池の正、負極集電体周縁部の絶縁密封には、一
般的に熱溶着性樹脂が用いられている。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a flat power generating element in which a flat power generating element is disposed between positive and negative current collectors, and the periphery of the current collector is insulated and sealed with heat-fusible resin. Concerning Batteries 02Ben Conventional Structure and Problems Heat-fusible resin is generally used for insulating and sealing the periphery of the positive and negative electrode current collectors of flat batteries.

第１図にその代表的構造を断面で示した。金属薄板から
なる正負極の集電体１，２の間に、電解液を含んだセパ
レータ３を中央部に介在した正極層４と負極層５とから
なる扁平な発電要素が配設されている。Figure 1 shows a typical structure in cross section. A flat power generation element consisting of a positive electrode layer 4 and a negative electrode layer 5 with a separator 3 containing an electrolyte interposed in the center is arranged between positive and negative electrode current collectors 1 and 2 made of thin metal plates. .

ここでの絶縁密封のための熱溶着性樹脂６は額縁吠に構
成され、中央に耐熱性樹脂７ａを配設した熱溶着性樹脂
７ｂからなっていた。耐熱性樹脂７ａを中央にしだサン
ドイッチ構造にする理由は、液密封口する際に電池の周
囲を加熱加圧するのであるが、その際集電体１，２が接
触するのを防止するためである。しかしこの構造では、
第２図のごとく加熱加圧により熱溶着性樹脂が溶けては
み出し、封口部において、正負極の集電体１Ｊの先端８
で接触する場合が生ずる。この問題点を解消する方策が
検討されたが十分に満足のゆくものではなかった。それ
は第２図のごとく、耐熱性３７゛　） の良好な樹脂７ａが、加熱加圧によって熱溶着性樹脂７
ｂとの間でずれを起こすからである。Here, the heat-fusible resin 6 for insulation sealing was formed into a frame-like shape, and was made of a heat-fusible resin 7b with a heat-resistant resin 7a disposed in the center. The reason why the heat-resistant resin 7a is arranged in a sandwich structure in the center is to prevent the current collectors 1 and 2 from coming into contact with each other when the battery is heated and pressurized during liquid-tight sealing. . However, with this structure,
As shown in Fig. 2, the heat-fusible resin melts and protrudes due to heating and pressure, and at the sealing part, the tips 8 of the positive and negative current collectors 1J
Contact may occur. Measures to solve this problem have been considered, but none were fully satisfactory. As shown in Fig. 2, resin 7a with good heat resistance of 37゛
This is because it causes a deviation between the

発明の目的 本発明の目的は、熱溶着性樹脂と耐熱性樹脂とのずれを
防ぐかあるいは抑制することにより、扁平形電池製造時
の、正負極集電体どうしの接触をなくし、短絡不良を防
止することにある。OBJECTS OF THE INVENTION An object of the present invention is to prevent or suppress misalignment between heat-fusible resin and heat-resistant resin, thereby eliminating contact between positive and negative electrode current collectors during the manufacture of flat batteries, thereby reducing short-circuit failures. The purpose is to prevent it.

発明の構成 上記目的を達成するため、正、負極集電体のうち少なく
とも一方の集電体の周縁部と熱溶着性樹脂との間に熱硬
化性樹脂層を設けたことを特徴とする。このように構成
することで熱溶着性樹脂が溶融してはみ出しても短絡を
良好に防止することができる。Structure of the Invention In order to achieve the above object, the present invention is characterized in that a thermosetting resin layer is provided between the peripheral edge of at least one of the positive and negative electrode current collectors and the thermofusible resin. With this configuration, short circuits can be effectively prevented even if the heat-fusible resin melts and protrudes.

実施例の説明 本発明の実施例を第３図示した。扁平な発電要素は電解
液を含む七ノくレータ３を中央部に介在した正極層４と
負極層５からなり、この発電要素を正、負極集電体１，
２で両側からはさみ、この画集電体の対向する片面周縁
部に熱硬化性樹脂層７Ｃを設ける。これは溶液状の熱硬
化性樹脂、たとえばエポキシ樹脂を、集電体の周縁部の
みロールコータ−２またはグラビアコーターなどで塗布
すればよい。この後熱風乾燥にて硬化する。その厚さは
５ａ以上であれば本発明の目的とする短絡防止に十分効
果的がある。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention is shown in FIG. The flat power generation element consists of a positive electrode layer 4 and a negative electrode layer 5 with a seven-layer collector 3 containing an electrolyte interposed in the center, and this power generation element is connected to a positive electrode current collector 1, a negative electrode current collector 1,
2 from both sides, and a thermosetting resin layer 7C is provided on the peripheral edge of one opposing side of the image current collector. This can be done by applying a thermosetting resin in solution form, such as an epoxy resin, only to the peripheral edge of the current collector using a roll coater 2 or a gravure coater. After that, it is cured by hot air drying. If the thickness is 5a or more, it is sufficiently effective in preventing short circuits, which is the object of the present invention.

この周縁部周縁部性硬化層７Ｃを備えた集電体１゜２の
周縁部間を、熱溶着性樹脂７ａにて絶縁して液密封口す
る。その具体的方法は集電体の外側から加熱加圧によっ
て行表うとよい。The peripheral edges of the current collector 1.degree. 2 provided with the peripheral hardened layer 7C are insulated and liquid-tightly sealed with a thermofusible resin 7a. A specific method for this is preferably carried out by applying heat and pressure from the outside of the current collector.

上記の例は正、負極集電体の両方に熱硬化性樹脂層を設
けたが、正、負どちらか一方の集電体周縁部に熱硬化性
樹脂を設けても効果がある。In the above example, the thermosetting resin layer was provided on both the positive and negative current collectors, but it is also effective to provide the thermosetting resin on the peripheral edge of either the positive or negative current collector.

第４図の実施例は、とくに用いる電解液が熱硬化性樹脂
を溶解する性質の場合に有効である。即ち、熱硬化性樹
脂７Ｃは熱溶着性樹脂７ａの内縁部７−１と正、負極集
電体１，２との接着により被覆保護されているから接着
面の外縁部のみに熱硬化性樹脂が介在する構造を形成し
ている。この構造であれば、電解液による熱硬化性樹脂
の溶解５″ン が良好に防止できる。−例を述べれば、熱硬化性樹脂と
してエポキシ樹脂を用いた場合、これを溶解させる電解
液の溶媒としては、プロビレカーボネート、γ−ブチロ
ラクトン、１゜２−ジメトキシエタンなどがある。これ
らを−解液の主体として使用する電池は第４図の構造が
望ましい０発明の効果 このように少なくとも一方極の集電体の周縁部との熱溶
着性樹脂との間に熱硬化性樹脂を設置することによ抄、
耐熱性樹脂のずれがなくなり、従来例に比べて電池製造
時に、正、負極集電体の接触による短絡の発生が極めて
少なくなった０また電池周縁における液密封口部の厚さ
く第３図の１）が約１１０μの場合で、従来の中央に厚
さ５０μのポリエステルを位置させ、その両側にそれぞ
れ３０μの厚さのポリエチレンからなる熱溶着性樹脂を
配した方式と、本発明の両方の集電体の周縁部に熱硬化
樹脂層を１０μの厚さに形成し、中央に９０μの厚さの
熱溶着性樹脂を配した方式の製造時の短絡発生率を各２
００個について比較した６″シ ところ、次表のごとき結果であった。The embodiment shown in FIG. 4 is particularly effective when the electrolytic solution used has a property of dissolving thermosetting resin. That is, since the thermosetting resin 7C is covered and protected by adhesion between the inner edge 7-1 of the heat-fusible resin 7a and the positive and negative electrode current collectors 1 and 2, the thermosetting resin is applied only to the outer edge of the adhesive surface. It forms an intervening structure. With this structure, dissolution of the thermosetting resin by the electrolytic solution can be effectively prevented.For example, when an epoxy resin is used as the thermosetting resin, the solvent of the electrolytic solution that dissolves it Examples of these include propylecarbonate, γ-butyrolactone, and 1゜2-dimethoxyethane.Batteries using these as main components of the solution preferably have the structure shown in Figure 4.Advantages of the Invention In this way, at least one pole By placing a thermosetting resin between the peripheral edge of the current collector and the thermofusible resin,
There is no misalignment of the heat-resistant resin, and the occurrence of short circuits due to contact between the positive and negative electrode current collectors during battery manufacturing is extremely reduced compared to conventional examples. 1) is approximately 110μ, the conventional method of placing polyester with a thickness of 50μ in the center and placing heat-fusible resin made of polyethylene with a thickness of 30μ on each side, and the combination of the present invention. The short circuit occurrence rate during manufacturing of a method in which a thermosetting resin layer is formed at the periphery of the electrical body to a thickness of 10μ and a thermofusible resin layer is placed at the center with a thickness of 90μ is calculated by 2.
The results were as shown in the following table.

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

第１図は従来例における扁平形電池Ｑ要部を示す断面図
、第２図は額縁状熱溶着性樹脂を加熱加圧して集電体周
縁部に溶着した際の集電体相互の接触による短絡発生を
示す図、第３図は本発明の実施例における扁平形電池の
要部を示す断面図、第４図は本発明の別な実施例におけ
る電池の要部を示す断面図である。 １・・・・・・正極集電体、２・・・・・・負極集電体
、３・・・・・・セパレータ、４・・・・・・正極層、
５・・・・・・負極層、６・・・・・・絶縁密封のため
の熱溶着性樹脂、７ａ・・・・・・耐熱性樹脂、７ｂ・
・・・・・熱溶着性樹脂、７Ｃ・・・・・・熱硬化性樹
脂層。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図 ２ 第３図 第４図Figure 1 is a sectional view showing the main parts of a flat battery Q in a conventional example, and Figure 2 is a cross-sectional view showing the contact between current collectors when the frame-shaped heat-fusible resin is heated and pressurized to weld to the peripheral edge of the current collector. FIG. 3 is a cross-sectional view showing the main parts of a flat battery according to an embodiment of the present invention, and FIG. 4 is a cross-sectional view showing the main parts of a battery according to another embodiment of the present invention. 1... Positive electrode current collector, 2... Negative electrode current collector, 3... Separator, 4... Positive electrode layer,
5...Negative electrode layer, 6...Thermofusible resin for insulation sealing, 7a...Heat resistant resin, 7b.
...Thermofusible resin, 7C...Thermosetting resin layer. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (3)

【特許請求の範囲】[Claims] （１）正、負極集電体間に、扁平な発電要素を配設する
とともに上記画集電体の周縁部を熱溶着性樹脂で絶縁密
封した電池であって、少なくとも一方の集電体の周縁部
と熱溶着性樹脂との間に熱硬化性樹脂層を設けた扁平形
電池。(1) A battery in which a flat power generation element is disposed between positive and negative current collectors, and the peripheral edge of the image current collector is insulated and sealed with heat-fusible resin, the peripheral edge of at least one current collector A flat battery with a thermosetting resin layer between the part and the thermofusible resin. （２）正、負極集電体の周縁部と、これに対応した熱溶
着性樹脂の上下面外周縁部との間に熱硬化性樹脂層を設
けた特許請求の範囲第１項記載の扁平形電池。(2) A flat structure according to claim 1, wherein a thermosetting resin layer is provided between the peripheral edges of the positive and negative electrode current collectors and the corresponding outer peripheral edges of the upper and lower surfaces of the thermofusible resin. shaped battery. （３）熱硬化性樹脂がエポキシ樹脂である特許請求の範
囲第１項または第２項記載の扁平形電池。(3) The flat battery according to claim 1 or 2, wherein the thermosetting resin is an epoxy resin.