JPS59169057A - Flat lithium cell with lead terminals - Google Patents
Flat lithium cell with lead terminalsInfo
- Publication number
- JPS59169057A JPS59169057A JP4388783A JP4388783A JPS59169057A JP S59169057 A JPS59169057 A JP S59169057A JP 4388783 A JP4388783 A JP 4388783A JP 4388783 A JP4388783 A JP 4388783A JP S59169057 A JPS59169057 A JP S59169057A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- positive electrode
- terminal plate
- separator
- battery
- 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
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
- H01M6/14—Cells with non-aqueous electrolyte
- H01M6/16—Cells with non-aqueous electrolyte with organic electrolyte
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Primary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Cell Separators (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はリード端子付き扁平形リチウム電池のセパレー
タの改良に係り、負極端子板へのリード端子溶接時の負
極リチウムの溶融に基づく内部短絡の発生を防止し、電
池特性の良好なリード端子付き扁平形リチウム電池を提
供することを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a separator for a flat lithium battery with a lead terminal, which prevents the occurrence of an internal short circuit due to melting of the negative electrode lithium when the lead terminal is welded to the negative terminal plate, and improves the battery characteristics. The purpose of the present invention is to provide a flat lithium battery with good lead terminals.
リチウム電池は貯蔵特性がすぐれていることから、最近
、電気機器のバックアップ用電源として使用されること
が多くなってきた。このような用途に詔いては、本来、
機器の耐用期間中、電池の取り替えは行なわれないので
、電池の機器への組込みは機器の回路基板に電池をはん
だ付けなどで固定することによって行なわれる。そのた
め、はんだ付けなどがしやすいように、リード端子をあ
らかじめ電池に取り付けておく必要がある。Because lithium batteries have excellent storage characteristics, they have recently been increasingly used as backup power sources for electrical equipment. Originally, when chanting for such purposes,
Since the battery is not replaced during the life of the device, the battery is integrated into the device by fixing the battery to the device's circuit board by soldering or the like. Therefore, it is necessary to attach lead terminals to the battery in advance to facilitate soldering.
このリード端子の取り付けは、電池端子としての負極端
子板や正極缶にリード端子を直接スポット溶接すること
６とよって行なわれているが、負極−こ使用されている
リチウムは約１８６℃で溶融するため、負極端子板に大
きな熱量がかかるとリチウムが溶融し厚さが薄い扁平形
電池では溶融したリチウムが不織布で形成されたセパレ
ータを通過し内部短絡を引き起こすので、負極端子板番
こ大きなエネルギーを与えることができず、その結果、
負極側の溶接強度がどうしても低くなりがちである。This lead terminal is attached by directly spot welding the lead terminal to the negative terminal plate or positive electrode can that serves as the battery terminal, but the lithium used in the negative electrode melts at about 186°C. Therefore, if a large amount of heat is applied to the negative electrode terminal plate, the lithium will melt, and in thin flat batteries, the molten lithium will pass through the separator made of non-woven fabric and cause an internal short circuit. Unable to give, as a result,
The welding strength on the negative electrode side tends to be low.
また、上記の理由により、取付可能なリード端子には制
約があり、肉厚のある強度の大きいリード端子の取り付
けは不可能であった。Further, due to the above-mentioned reasons, there are restrictions on the lead terminals that can be attached, and it has been impossible to attach lead terminals that are thick and strong.
本発明者らはそのような事情に鑑み、負極端子板へのリ
ード端子溶接時の負極リチウムの溶融に基づく短絡発生
を防止すべく種々研究を重ねた結果、負極と正極とを隔
離するセパレータとして、従来使用のポリプロピレン不
織布に代えて微孔性樹脂フィルムを用いるときは、溶融
リチウムの正極側への流出が抑制され、内部短絡の発生
が防止されて電池特性の良好なリード端子付き扁平形リ
チウム電池が得られることを見出し、本発明を完成する
にいたった。In view of such circumstances, the inventors of the present invention have conducted various studies to prevent the occurrence of short circuits due to melting of the negative electrode lithium when welding the lead terminal to the negative electrode terminal plate. When a microporous resin film is used in place of the conventionally used polypropylene nonwoven fabric, the outflow of molten lithium to the positive electrode side is suppressed, the occurrence of internal short circuits is prevented, and flat lithium with lead terminals has good battery characteristics. They discovered that a battery could be obtained and completed the present invention.
すなわち、従来使用の不織布よりなるセパレータは空孔
率が大きいために、溶融リチウムが通過に小さな微細孔
であるため、溶融リチウムの通過がしにくく、短絡防止
効果が発揮される。That is, since the conventionally used separator made of nonwoven fabric has a large porosity, the molten lithium has small micropores through which molten lithium can pass, making it difficult for molten lithium to pass through, and exhibiting a short-circuit prevention effect.
また上記微孔性樹脂フィルムと不織布とを積み重ねてな
り、微孔性樹脂フィルムが負極に向きあうように配置し
たものは、前述の微孔性樹脂フィルムに基づく短絡防止
機能に加えて、保液性、吸液性が良好で、さらに良好な
セパレータ機能を発揮するので、本発明においてセパレ
ータとして好ましく使用される。In addition, a product made by stacking the above-mentioned microporous resin film and a nonwoven fabric, and arranging the microporous resin film to face the negative electrode, has a liquid-retaining function in addition to the short-circuit prevention function based on the microporous resin film described above. It is preferably used as a separator in the present invention because it has good properties and liquid absorption properties, and also exhibits a good separator function.
本発明において用いる微孔性樹脂フィルムとしては、例
えばポリエチレン、ポリプロピレンなどの耐溶剤性の微
孔性樹脂フィルムがあげられる。Examples of the microporous resin film used in the present invention include solvent-resistant microporous resin films such as polyethylene and polypropylene.
これらの微孔性樹脂フィルムは、１枚でも使用可能であ
るが、微孔に方向性があるため、単独使用する場合には
その微孔の方向を直交させて２枚積み重ねるか、あるい
はポリエチレン不織布、ポリプロピレン不織布などと積
重するのが好ましい。These microporous resin films can be used alone, but since the pores are directional, when used alone, two films must be stacked with the pores perpendicular to each other, or polyethylene nonwoven , polypropylene nonwoven fabric, etc. is preferred.
な詔、本発明において微孔性樹脂フィルムとしては、上
記のように物理的に孔がおいているものばかりではなく
、電解液によって膨潤する部分があり、該膨潤部分から
リチウムイオンを通過させ得るものも使用することがで
き、そのような観点からグラフトフィルム（ポリエチレ
ンフィルムにアクリル酸またはメタクリル酸をグラフト
重合させたグラフトフィルム）も使用可能である。In the present invention, the microporous resin film does not only have physical holes as described above, but also has a part that swells with the electrolyte, and allows lithium ions to pass through the swollen part. From this point of view, a graft film (a graft film obtained by graft polymerizing acrylic acid or methacrylic acid to a polyethylene film) can also be used.
つぎに実施例をあげて本発明を説明する。Next, the present invention will be explained with reference to Examples.
第１図は本発明のリード端子付き扁平形リチウム電池の
一実施例を示す断面図であり、図中、（１）はニッケル
ーステン・レス鋼クラッド板製の負極端子板である。（
２）は二酸化マンガン１００部（重量部、以下同様）、
りん状黒鉛１０部およびポリテトラフルオルエチレン２
部からなる合剤粉末を加圧成形してなる正極で、（３）
は正極（乏）の集電体としてのステンレス鋼製網である
。（４）はニッケルーステンレス鋼クラッド板製の正極
缶でステンレス鋼面が電池内部側に配置されており、（
５）は微孔性ポリプロピレンフィルムをその微孔の方向
を直交さ警て、２枚積み重ねてなる′セパレータ□で、
（６）は負極であり、この負極（６）は円板状の金属リ
チウムを負極端子板（１）に挿入し、負極端子板（１）
の内面にスポット溶接されたステンレス鋼製−（７）に
圧着することにより構成されている。（８）はポリプロ
ピレン製の環状ガスケットであり、この電池の電解液に
はプロピレンカーボネートと１．２−ジメトキシエタン
との容量比が２：１の混合溶媒に過塩素酸リチウムを０
．５モル／ｌ溶解させたものが使用されている。FIG. 1 is a sectional view showing an embodiment of a flat lithium battery with lead terminals according to the present invention. In the figure, (1) is a negative terminal plate made of a nickel-stainless steel clad plate. (
2) is 100 parts of manganese dioxide (parts by weight, the same applies hereinafter),
10 parts of phosphorous graphite and 2 parts of polytetrafluoroethylene
A positive electrode formed by pressure molding a mixture powder consisting of (3)
is a stainless steel mesh as a current collector for the positive electrode (poor). (4) is a positive electrode can made of a nickel-stainless steel clad plate, with the stainless steel side placed inside the battery.
5) is a separator □ made by stacking two microporous polypropylene films with the direction of the micropores perpendicular to each other.
(6) is a negative electrode, and this negative electrode (6) is made by inserting a disc-shaped metal lithium into the negative terminal plate (1).
It is constructed by crimping a stainless steel plate (7) spot-welded to the inner surface of the plate. (8) is an annular gasket made of polypropylene, and the electrolyte for this battery contains 0% lithium perchlorate in a mixed solvent of propylene carbonate and 1,2-dimethoxyethane in a volume ratio of 2:1.
．． A solution of 5 mol/l is used.
（９）は負極側のリード端子であり、このリード端子（
９）は直径０．７−のニッケル線よりなり、その一端を
プレスして厚さ約０．８■の平担状にしたもので、該平
担部のところで負極端子板（１）にスポット溶接されて
いる。（１（Ｉは正極側のリード端子で、このリード端
子叫は上記負極側のリード端子（９）と同様のニッケル
線よりなり、その先端平担部のところで正極缶（４）の
底部外面にスポット溶接されている。αυは電池の外周
部にかぶせた熱収縮性塩化ビニル樹脂チューブで、これ
は負極側のリード端子と正極缶（４）との間の短絡を防
止するためのものである。(9) is the lead terminal on the negative electrode side, and this lead terminal (
9) is made of a nickel wire with a diameter of 0.7mm, one end of which is pressed into a flat shape with a thickness of about 0.8cm, and a spot is placed on the negative terminal plate (1) at the flat part. Welded. (1 (I is the lead terminal on the positive electrode side, and this lead terminal is made of a nickel wire similar to the lead terminal (9) on the negative electrode side, and its flat end is attached to the bottom outer surface of the positive electrode can (4). It is spot welded. αυ is a heat-shrinkable PVC resin tube that covers the outer periphery of the battery, and this is to prevent short circuits between the negative electrode side lead terminal and the positive electrode can (4). .
第２図は本発明のリード端子付き扁平形リチウム電池の
他の実施例を示す要部拡大断面図であり、この実施例に
おいてはセパレータ（５）は微孔性ポリプロピレンフィ
ルム（５ｍ）とポリプロピレン不織布（５ｂ）とを積重
してなり、微孔性ポリプロピレンフィルム（５亀）が負
極（６）側に配置されている。FIG. 2 is an enlarged sectional view of main parts showing another embodiment of the flat lithium battery with lead terminals of the present invention. In this embodiment, the separator (5) is made of a microporous polypropylene film (5 m) and a polypropylene nonwoven fabric. (5b) and a microporous polypropylene film (5) is placed on the negative electrode (6) side.
つぎの第１表は上記本発明の電池ＡおよびＢと従来電池
Ｃの負極側リード端子を負極端子板にスポット溶接した
ときの内部短絡が発生した電池個数を調べた結果を示す
ものである。電池は直径２０日、高さくただし、電池本
体のみでリード端子の高さは含まない） ８．２ ｍの
扁平形リチウム電池であり、この電池の負極端子板に前
記のリード端子を蓄勢エネルギー３ＱＷ、 Ｓ 、通電
時間２ｍ Ｓ 、加圧力２ｋ（ｌでスポット溶接した。Table 1 below shows the results of investigating the number of batteries in which internal short circuits occurred when the negative lead terminals of the batteries A and B of the present invention and the conventional battery C were spot welded to the negative terminal plate. The battery is an 8.2 m flat lithium battery with a diameter of 20 days and a height (excluding the height of the battery body only, not including the height of the lead terminals), and the lead terminal is connected to the negative terminal plate of this battery to store energy. Spot welding was carried out using 3 QW, S, current application time of 2 m S, and pressing force of 2 k (l).
供試個数は各電池とも１００個ずつである。The number of samples tested was 100 for each battery.
第１表
（注）電池ＡおよびＢにおける微孔性ポリプロピレンフ
ィルムの厚みは２５μｍで、電池Ｂにおけるポリプロピ
レン不織布の坪量は４０ｇ汐であり、電池Ｃにおけるポ
リプロピレン不織布の坪量は５０（１／讐である。Table 1 (Note) The thickness of the microporous polypropylene film in Batteries A and B is 25 μm, the basis weight of the polypropylene nonwoven fabric in Battery B is 40 g, and the basis weight of the polypropylene nonwoven fabric in Battery C is 50 (1 / It is.
第１表に示すように、本発明の電池ＡおよびＢは従来電
池Ｃに比べて内部短絡の発生が少ない。As shown in Table 1, batteries A and B of the present invention have fewer internal short circuits than conventional battery C.
またリード端子の溶接強度が大きく、リード端子の剥れ
がなかった。Furthermore, the welding strength of the lead terminals was high, and there was no peeling of the lead terminals.
なお、本発明においてリード端子としては例えばニッケ
ル線、ニッケルメッキまたは錫メッキした鉄線あるいは
ステンレス銅線で直径が０．７〜１．０瓢でスポット溶
接番こ供される先端部は厚さ０．８−程度にプレスして
平担状にしたものを用いるのが好ましい。In the present invention, the lead terminal is, for example, a nickel wire, a nickel-plated or tin-plated iron wire, or a stainless steel copper wire, with a diameter of 0.7 to 1.0 mm, and the tip portion to be spot welded has a thickness of 0.5 mm. It is preferable to use a material that has been pressed into a flat shape by about 8 mm.
第１図は本発明のリード端子付き扁平形リチウム電池の
一実施例を示す断面図であり、第２図は本発明のリード
端子付き扁平形リチウム電池の他の実施例における要部
拡大断面図である。
（１）・・・負極端子板、（２）・・・正極、（４）・
・・正極缶、（５）・・・セパレータ、（５１１）・・
・微孔性ポリプロピレンフィルム、（５ｂ）・・・ポリ
プロピレン不織布、（６）・・・負極、（９）・・・負
極側のリード端子、（１Ｇ・・・正極側のリード端子
π１図
賃２図FIG. 1 is a sectional view showing one embodiment of a flat lithium battery with lead terminals of the present invention, and FIG. 2 is an enlarged sectional view of essential parts of another embodiment of the flat lithium battery with lead terminals of the present invention. It is. (1)...Negative terminal plate, (2)...Positive electrode, (4)...
...Positive electrode can, (5)...Separator, (511)...
・Microporous polypropylene film, (5b)...Polypropylene nonwoven fabric, (6)...Negative electrode, (9)...Lead terminal on the negative electrode side, (1G...Lead terminal on the positive electrode side π1 drawing fee 2 figure
Claims (1)
に取り付けてなるリード端子付き扁平形リチウム電池に
おいて、負極端子板内面に圧着した金属リチウムよりな
る負極と正極とを隔離するセパレータとして微孔性樹脂
フィルムを用いたことを特徴とするリード端子付き扁平
形リチウム電池。 ２、セパレータが微孔性樹脂フィルムと不織布とからな
り、微孔性樹脂フィルムが負極側に配置されてい−る特
許請求の範囲第１項記載のリード端子付き扁平形リチウ
ム電池。[Claims] 1. In a flat lithium battery with a lead terminal in which a lead terminal for extracting electricity is attached to the battery by welding, a negative electrode and a positive electrode made of metallic lithium crimped to the inner surface of the negative terminal plate are isolated. A flat lithium battery with lead terminals, characterized by using a microporous resin film as a separator. 2. The flat lithium battery with lead terminals according to claim 1, wherein the separator is made of a microporous resin film and a nonwoven fabric, and the microporous resin film is disposed on the negative electrode side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4388783A JPS59169057A (en) | 1983-03-16 | 1983-03-16 | Flat lithium cell with lead terminals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4388783A JPS59169057A (en) | 1983-03-16 | 1983-03-16 | Flat lithium cell with lead terminals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59169057A true JPS59169057A (en) | 1984-09-22 |
Family
ID=12676211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4388783A Pending JPS59169057A (en) | 1983-03-16 | 1983-03-16 | Flat lithium cell with lead terminals |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59169057A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2566587A1 (en) * | 1984-06-22 | 1985-12-27 | Sanyo Electric Co | NON-AQUEOUS ELECTROLYTE CELL |
| JPS6210857A (en) * | 1985-05-16 | 1987-01-19 | ダブリユー・アール・グレイス・アンド・カンパニー−コネチカツト | Separator for battery |
| JPS6237871A (en) * | 1985-08-10 | 1987-02-18 | Sanyo Electric Co Ltd | Non-acqueous electrolyte cell |
| JPS62136752A (en) * | 1985-12-07 | 1987-06-19 | Hitachi Maxell Ltd | Manufacture of lithium secondary battery |
| US6159634A (en) * | 1998-04-15 | 2000-12-12 | Duracell Inc. | Battery separator |
-
1983
- 1983-03-16 JP JP4388783A patent/JPS59169057A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2566587A1 (en) * | 1984-06-22 | 1985-12-27 | Sanyo Electric Co | NON-AQUEOUS ELECTROLYTE CELL |
| JPS6210857A (en) * | 1985-05-16 | 1987-01-19 | ダブリユー・アール・グレイス・アンド・カンパニー−コネチカツト | Separator for battery |
| JPH0438101B2 (en) * | 1985-05-16 | 1992-06-23 | Grace W R & Co | |
| JPS6237871A (en) * | 1985-08-10 | 1987-02-18 | Sanyo Electric Co Ltd | Non-acqueous electrolyte cell |
| JPS62136752A (en) * | 1985-12-07 | 1987-06-19 | Hitachi Maxell Ltd | Manufacture of lithium secondary battery |
| US6159634A (en) * | 1998-04-15 | 2000-12-12 | Duracell Inc. | Battery separator |
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