JP2002260599A - Flat type nonaqueous electrolyte cell - Google Patents
Flat type nonaqueous electrolyte cellInfo
- Publication number
- JP2002260599A JP2002260599A JP2001058342A JP2001058342A JP2002260599A JP 2002260599 A JP2002260599 A JP 2002260599A JP 2001058342 A JP2001058342 A JP 2001058342A JP 2001058342 A JP2001058342 A JP 2001058342A JP 2002260599 A JP2002260599 A JP 2002260599A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- negative electrode
- sealing plate
- flat
- 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.)
- Withdrawn
Links
Classifications
-
- Y02E60/12—
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、扁平形非水電解液
電池に係り、特に放電性能を向上させた扁平形非水電解
液電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat nonaqueous electrolyte battery, and more particularly to a flat nonaqueous electrolyte battery having improved discharge performance.
【０００２】[0002]
【従来の技術】扁平形非水電解液電池は卓上電子計算
機、腕時計等の電子機器に用いられているが、近年、そ
の利用分野が広がり、電池の薄型化が進む一方、放電性
能に優れた電池が望まれている。2. Description of the Related Art Flat non-aqueous electrolyte batteries are used for electronic devices such as desk-top computers and wristwatches. In recent years, the fields of use have been widened and the batteries have been made thinner, while having excellent discharge performance. Batteries are desired.
【０００３】薄型電池の高性能化を図るには内容積の確
保が重要であり、これまでに電池構造に関してはさまざ
まな試みがなされてきた。その中で負極封口板及び正極
容器に用いられるステンレス鋼材も電池の薄型化に伴い
年々薄肉化され、板厚０．２５ｍｍ以下の薄い鋼材が用
いられるようになった。It is important to secure the internal volume in order to improve the performance of a thin battery, and various attempts have been made on the battery structure. Among them, the stainless steel materials used for the negative electrode sealing plate and the positive electrode container have been reduced in thickness year by year as the batteries have become thinner, and thin steel materials having a plate thickness of 0.25 mm or less have come to be used.
【０００４】しかし、板厚０．２５ｍｍ以下の鋼材の負
極封口板及び正極容器平坦部は、鋼材を薄肉化したため
強度が低下しており、かしめによる密封加工をした際、
負極封口板及び正極容器平坦部が外側に膨れ易く、電池
の厚さ寸法が規格値を超えてしまい、内容物である発電
要素と負極封口板あるいは正極容器との密着が不十分と
なり、放電性能が低下するという問題があった。[0004] However, the strength of the negative electrode sealing plate and the flat portion of the positive electrode container having a plate thickness of 0.25 mm or less is reduced due to the thinning of the steel material.
The negative electrode sealing plate and the flat part of the positive electrode container are easily swelled outward, the thickness of the battery exceeds the specified value, and the adhesion between the power generation element as a content and the negative electrode sealing plate or the positive electrode container becomes insufficient, and the discharge performance becomes poor. However, there was a problem that was reduced.
【０００５】このため、従来は図４に示す負極封口板の
負極と密接する平坦部（点線部分）と、図５に示す正極
容器の正極が密接する平坦部（点線部分）とが外周部よ
り電池の内側へ凹状となった負極封口板（実線部分）１
ａ及び正極容器（実線部分）６ａを用いる非水電解液電
池が提案されている（特開平５−１１４３９１号公報参
照）。しかし、電池の薄型化あるいは高容量化が更に進
んだ近年では、負極封口板及び正極容器の原材料として
板厚０．２０ｍｍ以下の鋼材を用いることが多くなって
いる。このような０．２０ｍｍ以下の薄い鋼材からなる
負極封口板及び正極容器を用いた電池では、負極封口板
及び正極容器の平坦部の強度が更に弱まっているため、
それぞれの平坦部の形状を凹状とした場合でも負極封口
板あるいは正極容器と電極との接触圧が低下し、充分な
効果が得られていなかった。Conventionally, a flat portion (dotted line portion) of the negative electrode sealing plate shown in FIG. 4 which is in close contact with the negative electrode and a flat portion (dotted line portion) of the positive electrode container shown in FIG. Negative electrode sealing plate (solid line) recessed inside the battery 1
and a nonaqueous electrolyte battery using a positive electrode container (solid line portion) 6a has been proposed (see Japanese Patent Application Laid-Open No. 5-114391). However, in recent years, as batteries have become thinner or have higher capacities, steel materials having a plate thickness of 0.20 mm or less have been increasingly used as raw materials for the negative electrode sealing plate and the positive electrode container. In the battery using the negative electrode sealing plate and the positive electrode container made of such a thin steel material of 0.20 mm or less, since the strength of the flat portion of the negative electrode sealing plate and the positive electrode container is further reduced,
Even when the shape of each flat portion was concave, the contact pressure between the negative electrode sealing plate or the positive electrode container and the electrode was reduced, and a sufficient effect was not obtained.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記問題に対
処するためになされたものであって、０．２０ｍｍ以下
のステンレス鋼材を負極封口板あるいは正極容器に用い
ても、内容物である発電要素と負極封口板あるいは正極
容器との密着が充分で放電性能の優れた扁平形非水電解
液電池を提供することを目的とするものである。SUMMARY OF THE INVENTION The present invention has been made in order to address the above-mentioned problems. Even if a stainless steel material having a thickness of 0.20 mm or less is used for a negative electrode sealing plate or a positive electrode container, the power generation as a content is not affected. It is an object of the present invention to provide a flat nonaqueous electrolyte battery in which the element and the negative electrode sealing plate or the positive electrode container have sufficient adhesion and excellent discharge performance.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に本発明は、負極と正極と非水電解液を含浸したセパレ
ータとからなる発電要素を、負極封口板と正極容器とこ
の間に介在する封口パッキングにより密封された構造を
有する扁平形非水電解液電池において、負極封口板の負
極と接する平坦部がその外周部より電池内面側へ平坦部
中央が頂点となる多角錐状の凹部を有する負極封口板、
及び正極容器の正極と接する平坦部がその外周部より電
池内面側へ平坦部中央が頂点となる多角錐状の凹部を有
する正極容器の少なくともいずれか一方の負極封口板ま
たは正極容器を用いることを特徴とする。According to the present invention, there is provided a power generating element comprising a negative electrode, a positive electrode, and a separator impregnated with a non-aqueous electrolyte interposed between a negative electrode sealing plate, a positive electrode container, and the like. In a flat nonaqueous electrolyte battery having a structure sealed by a sealing packing, a flat portion in contact with a negative electrode of a negative electrode sealing plate has a polygonal pyramid-shaped concave portion whose center is a vertex from the outer peripheral portion to the battery inner surface side. Negative electrode sealing plate,
The flat portion in contact with the positive electrode of the positive electrode container has a polygonal pyramid-shaped concave portion with the center of the flat portion as the vertex from the outer peripheral portion to the inner surface of the battery, and at least one of the negative electrode sealing plate and the positive electrode container is used. Features.
【０００８】本発明によれば、０．２０ｍｍ以下の薄い
ステンレス鋼材を原材料とする負極封口板の負極と接す
る平坦部及び正極容器の正極と接する平坦部のいずれか
一方をその外周部より電池内面側へ平坦部中央が頂点と
なる多角錐状の凹部を有することで平坦部が電池内面側
に凹状となるだけではなく、平坦部に複数の平坦部中央
から外周部に放射状の「く」の字状に折り曲がった直線
が形成され、これら放射線上の直線部は「く」の字に折
り曲げられたことによる加工硬化により平坦部の強度が
補強されるだけでなく、かしめ加工時に発生する横方向
のひずみもこれら直線部分により分断される。従って、
０．２０ｍｍ以下のステンレス鋼材からなる負極封口板
あるいは正極容器を使用した扁平形非水電解液電池にお
いて、このような形状の負極封口板と正極容器のいずれ
か一方を用いることで、電池を密閉した際の負極封口板
及び正極容器平坦部の膨れは抑制され、安定した電池の
厚さ寸法が得られると共に、内容物である発電要素と負
極封口板あるいは正極容器との接触圧を高めることがで
きる。これにより、負極封口板あるいは正極容器と発電
要素との接触抵抗が低減するため、電池の内部抵抗も低
減でき、放電性能の向上が可能となった。According to the present invention, one of the flat portion of the negative electrode sealing plate made of a thin stainless steel material having a thickness of 0.20 mm or less as a raw material and the flat portion of the positive electrode container, which contacts the negative electrode, is placed on the inner surface of the battery from its outer peripheral portion. By having a polygonal pyramid-shaped recess with the center of the flat part as the vertex to the side, not only the flat part becomes concave on the battery inner surface side, but also a plurality of flat parts on the flat part radially from the center to the outer periphery. Straight lines bent in the shape of a letter are formed, and these straight lines on the radiation not only reinforce the strength of the flat part due to work hardening due to being bent in the shape of a letter, but also generate horizontal The directional strain is also divided by these straight portions. Therefore,
In a flat nonaqueous electrolyte battery using a negative electrode sealing plate or a positive electrode container made of a stainless steel material of 0.20 mm or less, the battery is hermetically sealed by using one of the negative electrode sealing plate and the positive electrode container having such a shape. Swelling of the negative electrode sealing plate and the flat portion of the positive electrode container at the time of being suppressed is suppressed, a stable battery thickness dimension is obtained, and the contact pressure between the power generation element as a content and the negative electrode sealing plate or the positive electrode container can be increased. it can. As a result, the contact resistance between the negative electrode sealing plate or the positive electrode container and the power generation element is reduced, so that the internal resistance of the battery can be reduced and the discharge performance can be improved.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施例を図を参照
して説明する。 （実施例１）図１は、本発明の実施例１の断面図であ
り、厚さ０．１５ｍｍのステンレス鋼板を図２に示すよ
うに電極に接する平坦部をその外周部より電池内面側へ
平坦部中央が頂点となる図６（ｂ）に示すような四角錐
状の凹部を有し、図７に示すＡ寸法値が０．０３から
０．０５ｍｍとなる形状にプレス加工した負極封口板１
ｂに、負極作用物質として厚さ０．１８ｍｍのリチウム
フォイルを外径φ１３．１ｍｍの形状に打ち抜き負極２
とし、負極封口板１ｂの内底面に圧着した。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. (Example 1) FIG. 1 is a cross-sectional view of Example 1 of the present invention. As shown in FIG. 2, a stainless steel plate having a thickness of 0.15 mm is formed by placing a flat portion in contact with an electrode from the outer peripheral portion to the inner side of the battery. A negative electrode sealing plate having a quadrangular pyramid-shaped concave portion as shown in FIG. 6B in which the center of the flat portion is an apex and pressed into a shape having an A dimension value of 0.03 to 0.05 mm shown in FIG. 1
b, a lithium foil having a thickness of 0.18 mm was punched out into a shape having an outer diameter of 13.1 mm as a negative electrode active material to form a negative electrode 2
And pressed against the inner bottom surface of the negative electrode sealing plate 1b.
【００１０】正極作用物質には加熱処理された電解二酸
化マンガンを用い、この電解二酸化マンガン９０質量部
と、導電材として黒鉛粉末を８質量部と、バインダーと
してポリテトラフルオロエチレンの水性ディスパージョ
ン２質量部（固形分として）とを混練して正極合剤を調
製し、この正極合剤を厚さ０．５２ｍｍ外径φ１２．９
ｍｍのペレット状に成形した後加熱乾燥し正極４とし
た。この正極４とポリプロピレン樹脂からなる封口パッ
キング５にブローンアスファルトを有機溶剤にて溶解し
たシール剤を塗布したものとを、厚さ０．１５ｍｍのス
テンレス鋼板を図３のように電極に接する平坦部をその
外周部より電池内面側へ平坦部中央が頂点となる図６
（ｂ）に示すような四角錐状の凹部を有し、図８に示す
Ｂ寸法値が０．０３から０．０５ｍｍとなる形状にプレ
ス加工した正極容器６内へ収納し、電解液としてプロピ
レンカーボネイトと１，２−ジメトキシエタンの混合溶
媒に、過塩素酸リチウムを溶解させたものを用い、これ
を含浸させたポリプロピレン繊維からなる不織布を用い
たセパレータ３を、負極２と正極４の間に介在させ、正
極容器６の上部をかしめて封口固定し、扁平形二酸化マ
ンガンリチウム一次電池を作成し、実施例１とした。Heat-treated electrolytic manganese dioxide is used as the positive electrode active material, 90 parts by mass of this electrolytic manganese dioxide, 8 parts by mass of graphite powder as a conductive material, and 2 parts by mass of an aqueous dispersion of polytetrafluoroethylene as a binder. Parts (as a solid content) and kneaded to prepare a positive electrode mixture, and this positive electrode mixture is 0.52 mm thick and has an outer diameter of φ12.9.
After forming into a pellet having a diameter of 2 mm, the resultant was dried by heating to obtain a positive electrode 4. A sealing material obtained by dissolving blown asphalt in an organic solvent was applied to the positive electrode 4 and a sealing packing 5 made of polypropylene resin, and a 0.15 mm-thick stainless steel plate was placed on a flat portion in contact with the electrode as shown in FIG. FIG. 6 in which the center of the flat portion is located at the top from the outer peripheral portion toward the inner surface of the battery.
It has a square pyramid-shaped recess as shown in (b), and is housed in a positive electrode container 6 which is pressed into a shape having a B dimension value of 0.03 to 0.05 mm as shown in FIG. A separator 3 using a non-woven fabric made of polypropylene fibers impregnated with lithium perchlorate dissolved in a mixed solvent of carbonate and 1,2-dimethoxyethane is placed between the negative electrode 2 and the positive electrode 4. The flattened manganese dioxide lithium primary battery was produced by interposing and caulking the upper portion of the positive electrode container 6 to fix the opening.
【００１１】（実施例２）厚さ０．１５ｍｍのステンレ
ス鋼板を電極に接する平坦部をその外周部より電池内面
側へ平坦部中央が頂点となる図６（ａ）に示すような三
角錐状の凹部を有する形状にプレス加工した負極封口板
１ａ及び正極容器６を用いた以外は、実施例１と同様の
電池を作成し実施例２とした。(Example 2) A flat portion in contact with a stainless steel plate having a thickness of 0.15 mm is formed in a triangular pyramid shape as shown in FIG. A battery was prepared in the same manner as in Example 1 except that the negative electrode sealing plate 1a and the positive electrode container 6 which were pressed into a shape having the concave portion were used, and Example 2 was obtained.
【００１２】（実施例３）厚さ０．１５ｍｍのステンレ
ス鋼板を電極に接する平坦部をその外周部より電池内面
側へ平坦部中央が頂点となる図６（ｃ）に示すような五
角錐状の凹部を有する形状にプレス加工した負極封口板
１ｃ及び正極容器６を用いた以外は、実施例１と同様の
電池を作成し実施例３とした。(Example 3) A stainless steel plate having a thickness of 0.15 mm is formed in a pentagonal pyramid shape as shown in FIG. A battery was prepared in the same manner as in Example 1 except that the negative electrode sealing plate 1c and the positive electrode container 6 pressed into a shape having the concave portion were used, and the battery was made Example 3.
【００１３】（比較例１）厚さ０．１５ｍｍのステンレ
ス鋼板を電極に密接する平坦部が外周部より電池の内側
へ凹状となった図４に示す形状の負極封口板１ｄと厚さ
０．１５ｍｍのステンレス鋼板を電極に接する平坦部を
その外周部より電池内面側へ平坦部中央が頂点となる四
角錐状の凹部を有する形状にプレス加工した正極容器６
ａとを用いた以外は、実施例１と同様の電池を作成し比
較例１とした。(Comparative Example 1) A negative electrode sealing plate 1d having a thickness of 0.15 mm as shown in FIG. A positive electrode container 6 formed by pressing a flat portion in contact with an electrode from a 15 mm stainless steel plate into a shape having a quadrangular pyramid-shaped concave portion whose central portion is a vertex from the outer peripheral portion toward the inner surface of the battery.
A battery was prepared in the same manner as in Example 1 except that a was used.
【００１４】（比較例２）厚さ０．１５ｍｍのステンレ
ス鋼板を電極に密接する平坦部をその外周部より電池内
面側へ平坦部中央が頂点となる四角錐状の凹部を有する
形状にプレス加工した負極封口板１ｄと、厚さ０．１５
ｍｍのステンレス鋼板を電極に密接する平坦部が外周部
より電池の内側へ凹状となった図５に示す形状の正極容
器６ａとを用いた以外は、実施例１と同様の電池を作成
し比較例２とした。(Comparative Example 2) A stainless steel plate having a thickness of 0.15 mm was pressed from the outer peripheral portion to the inner surface of the battery from the outer peripheral portion to a shape having a quadrangular pyramid-shaped concave portion having a flat portion at the top. Negative electrode sealing plate 1d and thickness 0.15
A battery similar to that of Example 1 was prepared except that a stainless steel plate having a thickness of 2 mm was used, and a flat portion closely contacting the electrode was used to form a positive electrode container 6a having the shape shown in FIG. Example 2 was used.
【００１５】（比較例３）厚さ０．１５ｍｍのステンレ
ス鋼板を電極に密接する平坦部が外周部より電池の内側
へ凹状となった図４に示す形状の負極封口板１ｄと、厚
さ０．１５ｍｍのステンレス鋼板を電極に密接する平坦
部が外周部より電池の内側へ凹状となった図５に示す形
状の正極容器６ａとを用いた以外は、実施例１と同様の
電池を作成し比較例３（従来例）とした。(Comparative Example 3) A negative electrode sealing plate 1d of a shape shown in FIG. 4 in which a flat portion closely contacting an electrode was formed by recessing a 0.15 mm thick stainless steel plate from the outer peripheral portion to the inside of the battery, and a thickness of 0 A battery was prepared in the same manner as in Example 1 except that a positive electrode container 6a having a shape shown in FIG. Comparative Example 3 (conventional example) was used.
【００１６】以上説明した実施例１〜実施例３及び比較
例１〜比較例３の各電池をそれぞれ１００個作成し、電
池の厚さ寸法、内部抵抗を測定した。また、各１０個の
電池を２０℃の環境下で負荷抵抗３０ＫΩの連続放電を
実施し、終止電圧２．０Ｖまでの放電電気容量を測定し
た。表１に電池の厚さ寸法、内部抵抗及び放電電気容量
の測定結果を示す。One hundred batteries were prepared for each of Examples 1 to 3 and Comparative Examples 1 to 3 described above, and the thickness and internal resistance of the batteries were measured. Further, continuous discharge was performed on each of the ten batteries at a load resistance of 30 KΩ in an environment of 20 ° C., and the discharge electric capacity up to a final voltage of 2.0 V was measured. Table 1 shows the measurement results of the thickness, internal resistance, and discharge capacity of the battery.
【００１７】[0017]
【表１】 [Table 1]
【００１８】表１から、実施例１〜実施例３は比較例１
〜比較例３に対し電池厚さ寸法、内部抵抗は低い値が得
られ、放電電気容量は高い値が得られており、これら測
定値の標準偏差からバラツキも少なくなっている。ま
た、実施例１、実施例２及び実施例３の測定値及び標準
偏差には差はなく、同等の結果が得られた。From Table 1, Examples 1 to 3 are Comparative Examples 1
In comparison with Comparative Example 3, the battery thickness dimension and the internal resistance obtained lower values, the discharge electric capacity obtained higher values, and the dispersion from the standard deviation of these measured values was reduced. In addition, there was no difference between the measured values and the standard deviations of Example 1, Example 2, and Example 3, and equivalent results were obtained.
【００１９】一方、比較例１及び比較例２は、実施例１
〜実施例３には及ばないものの比較例３（従来例）に対
し、電池厚さ寸法及び内部抵抗は低い値が得られ、放電
電気容量においても優れた値が得られた。On the other hand, Comparative Example 1 and Comparative Example 2
Although not as good as Example 3, the thickness and internal resistance of the battery were lower than those of Comparative Example 3 (conventional example), and excellent values of the discharge electric capacity were also obtained.
【００２０】次に、本発明における多角錐形状の図７及
び図８に示すＡ及びＢ寸法値について実験を行った。 （実施例１２）厚さ０．１５ｍｍのステンレス鋼板を電
極に接する平坦部をその外周部より電池内面側へ平坦部
中央が頂点となる図６（ｂ）に示すような四角錐状の凹
部を有し、図７及び図８に示すＡ及びＢ寸法値を０．０
６から０．０８ｍｍとした形状にプレス加工した負極封
口板１ｂ及び正極容器６を用いた以外は、実施例１と同
様の電池を作成し実施例１２とした。Next, an experiment was conducted on the A and B dimension values shown in FIGS. 7 and 8 of the polygonal pyramid shape in the present invention. (Example 12) A stainless steel plate having a thickness of 0.15 mm and a flat portion in contact with the electrode were formed by forming a quadrangular pyramid-shaped concave portion as shown in FIG. A and B dimension values shown in FIG. 7 and FIG.
A battery was prepared in the same manner as in Example 1 except that the negative electrode sealing plate 1b and the positive electrode container 6 which were press-processed to have a shape of 6 to 0.08 mm were used.
【００２１】（実施例１３）厚さ０．１５ｍｍのステン
レス鋼板を電極に接する平坦部をその外周部より電池内
面側へ平坦部中央が頂点となる図６（ｂ）に示すような
四角錐状の凹部を有し、図７及び図８に示すＡ及びＢ寸
法値を０．０９から０．１１ｍｍとした形状にプレス加
工した負極封口板１ｂ及び正極容器６を用いた以外は、
実施例１と同様の電池を作成し実施例１３とした。(Example 13) A stainless steel plate having a thickness of 0.15 mm is formed in a quadrangular pyramid shape as shown in FIG. 7 and FIG. 8 except that the negative electrode sealing plate 1 b and the positive electrode container 6 were pressed into a shape with the A and B dimensions shown in FIGS. 7 and 8 being 0.09 to 0.11 mm.
A battery similar to that of Example 1 was prepared, and the battery was referred to as Example 13.
【００２２】（比較例１２）厚さ０．１５ｍｍのステン
レス鋼板を電極に接する平坦部をその外周部より電池内
面側へ平坦部中央が頂点となる図６（ｂ）に示すような
四角錐状の凹部を有し、図７及び図８に示すＡ及びＢ寸
法値を０．０１から０．０３ｍｍとした形状にプレス加
工した負極封口板１ｄ及び正極容器６ａを用いた以外
は、実施例１と同様の電池を作成し比較例１２とした。(Comparative Example 12) A stainless steel plate having a thickness of 0.15 mm was formed in a quadrangular pyramid shape as shown in FIG. Example 1 except that the negative electrode sealing plate 1d and the positive electrode container 6a were press-formed into a shape having the concave portions A and B shown in FIGS. 7 and 8 with the A and B dimension values of 0.01 to 0.03 mm. A battery similar to that described above was prepared, and Comparative Example 12 was made.
【００２３】（比較例１３）厚さ０．１５ｍｍのステン
レス鋼板を電極に接する平坦部をその外周部より電池内
面側へ平坦部中央が頂点となる図６（ｂ）に示すような
四角錐状の凹部を有し、図７及び図８に示すＡ及びＢ寸
法値を０．１２から０．１４ｍｍとした形状にプレス加
工した負極封口板１ｄ及び正極容器６ａを用いた以外
は、実施例１と同様の電池を作成し比較例１３とした。(Comparative Example 13) A stainless steel plate having a thickness of 0.15 mm was formed in a quadrangular pyramid shape as shown in FIG. Example 1 except that the negative electrode sealing plate 1d and the positive electrode container 6a were pressed into a shape in which the A and B dimensions shown in FIGS. 7 and 8 were 0.12 to 0.14 mm. A battery similar to that of Example 1 was prepared to make Comparative Example 13.
【００２４】以上説明した実施例１，１２，１３及び比
較例１２，１３の各電池をそれぞれ１００個作成し、電
池の厚さ寸法、内部抵抗を測定した。また、各１０個の
電池を２０℃の環境下で負荷抵抗３０ＫΩの連続放電を
実施し、終止電圧２．０Ｖまでの放電電気容量を測定し
た。表２に電池の厚さ寸法、内部抵抗及び放電電気容量
の測定結果を示す。Each of the batteries of Examples 1, 12, and 13 and Comparative Examples 12 and 13 described above was prepared, and the thickness and internal resistance of the batteries were measured. Further, continuous discharge was performed on each of the ten batteries at a load resistance of 30 KΩ in an environment of 20 ° C., and the discharge electric capacity up to a final voltage of 2.0 V was measured. Table 2 shows the measurement results of the thickness, internal resistance, and discharge capacity of the battery.
【００２５】[0025]
【表２】 [Table 2]
【００２６】表２から、実施例１と実施例１２，１３は
電池厚さ寸法、内部抵抗及び放電電気容量に大差は見ら
れず同様の結果が得られているが、比較例１３は図７及
び図８に示すＡ及びＢ寸法値を０．１２から０．１４ｍ
ｍと凹み量が多くなっているため電池を組み立てる際に
正極合剤あるいは正極容器の編めあわせが不安定とな
り、工程不良が２％発生した。From Table 2, it can be seen that Example 1 and Examples 12 and 13 show similar results without significant differences in battery thickness, internal resistance and discharge electric capacity, while Comparative Example 13 shows FIG. And A and B dimension values shown in FIG. 8 from 0.12 to 0.14 m
When the battery was assembled, the knitting of the positive electrode mixture or the positive electrode container became unstable due to the large dent amount, and the process failure occurred 2%.
【００２７】また、比較例１２のように図７及び図８に
示すＡ及びＢ寸法値を０．０１から０．０２ｍｍと少な
くすると、電池厚さ寸法は高くなり、内部抵抗が上昇
し、放電電気容量は低下する。これは、負極封口板或い
は正極容器と内容物である発電要素との接触圧を充分に
高めることができないためと考えられる。When the dimension values A and B shown in FIGS. 7 and 8 are reduced from 0.01 to 0.02 mm as in Comparative Example 12, the battery thickness dimension increases, the internal resistance increases, and The electric capacity decreases. This is considered to be because the contact pressure between the negative electrode sealing plate or the positive electrode container and the power generation element as the content cannot be sufficiently increased.
【００２８】以上の結果から、０．２０ｍｍ以下の薄い
ステンレス鋼板からなる負極封口板及び正極容器を用い
た場合でも、負極封口板の負極と接する平坦部が、その
外周部より電池内面側へ平坦部中央が頂点となる多角錐
状の図７に示すＡ寸法値が０．０３〜０．１１ｍｍの凹
部を有する負極封口板と、正極容器の正極と接する平坦
部がその外周部より電池内面側へ平坦部中央が頂点とな
る多角錐状の図８に示すＢ寸法値が０．０３〜０．１１
ｍｍの凹部を有する正極容器とを用いることで、負極封
口板あるいは正極容器と内容物である発電要素との接触
圧を高めることが可能となった。その結果、電池厚さ寸
法が安定し、内部抵抗が低くなり、放電性能が向上し
た。From the above results, even when the negative electrode sealing plate and the positive electrode container made of a thin stainless steel plate having a thickness of 0.20 mm or less are used, the flat portion of the negative electrode sealing plate contacting the negative electrode is flattened from the outer peripheral portion toward the inside of the battery. A negative electrode sealing plate having a polygonal pyramid-shaped concave portion having an A dimension value of 0.03 to 0.11 mm as shown in FIG. The B-dimension value shown in FIG.
By using a positive electrode container having a concave portion of mm, the contact pressure between the negative electrode sealing plate or the positive electrode container and the power generation element as the content can be increased. As a result, the thickness of the battery was stabilized, the internal resistance was reduced, and the discharge performance was improved.
【００２９】また、本発明における形状を有する負極封
口板あるいは正極容器のいずれかを用いることで、電池
厚さ寸法、内部抵抗及び放電性能の改善は図れるもの
の、負極封口板と正極容器の両方に本発明における形状
を用いることがより好ましく負極封口板及び正極容器平
坦部の形状については図６に示す実施例以外にも多角錐
状の凹部を有する形状であれば同様の効果が得られる。By using either the negative electrode sealing plate or the positive electrode container having the shape in the present invention, the battery thickness, internal resistance and discharge performance can be improved, but both the negative electrode sealing plate and the positive electrode container can be used. It is more preferable to use the shape in the present invention, and as for the shapes of the negative electrode sealing plate and the flat portion of the positive electrode container, similar effects can be obtained as long as the shape has a polygonal pyramid-shaped recess other than the embodiment shown in FIG.
【００３０】尚、本発明の実施例では扁平形二酸化マン
ガンリチウム一次電池を例に説明をしているが、負極に
リチウム金属やリチウムの吸蔵、放出が可能なリチウム
合金、カーボン、金属酸化物及びポリアセン等を用い、
電解液に非水電解液、正極には五酸化バナジウム、五酸
化ニオブ、二酸化マンガン等リチウムイオンと層間化合
物を形成する金属酸化物リチウムと金属酸化物との複合
酸化物あるいは二硫化チタン、ポリアセンなどの導電性
高分子等を用いた充電可能な二次電池においても本発明
と同様の効果が得られる。In the embodiments of the present invention, a flat lithium manganese dioxide primary battery is described as an example. However, lithium metal, lithium alloy, carbon, metal oxide and the like capable of occluding and releasing lithium metal are used for the negative electrode. Using polyacene, etc.
Non-aqueous electrolyte for electrolyte, vanadium pentoxide, niobium pentoxide, manganese dioxide, etc. Composite oxide of lithium metal oxide and metal oxide that forms an intercalation compound with lithium ions, titanium disulfide, polyacene The same effects as those of the present invention can be obtained in a rechargeable secondary battery using the conductive polymer or the like.
【００３１】[0031]
【発明の効果】以上説明したように、本発明によれば、
負極と正極と非水電解液を含浸したセパレータからなる
発電要素を負極封口板と正極容器とこの間に介在する封
口パッキングにより密封された構造を有する扁平形非水
電解液電池であって、０．２０ｍｍ以下の薄いステンレ
ス鋼板からなる負極封口板及び正極容器を用いた場合で
も、負極封口板の負極と接する平坦部がその外周部より
電池内面側へ平坦部中央が頂点となる多角錐状の凹部を
有した負極封口板と、正極容器の正極と接する平坦部が
その外周部より電池内面側へ平坦部中央が頂点となる多
角錐状の凹部を有した正極容器の少なくともいずれか一
方の負極封口板または正極容器を用いることで電池厚さ
寸法及び内部抵抗の安定した、放電性能の優れた扁平形
非水電解液電池を提供することが可能となった。As described above, according to the present invention,
A flat nonaqueous electrolyte battery having a structure in which a power generation element including a negative electrode, a positive electrode, and a separator impregnated with a nonaqueous electrolyte is sealed by a negative electrode sealing plate, a positive electrode container, and a sealing packing interposed therebetween. Even when a negative electrode sealing plate and a positive electrode container made of a thin stainless steel sheet of 20 mm or less are used, a flat portion in contact with the negative electrode of the negative electrode sealing plate has a polygonal pyramid-shaped concave portion whose center is a vertex from the outer peripheral portion toward the inside of the battery. Negative electrode sealing plate having at least one of a negative electrode sealing plate and a positive electrode container having a polygonal pyramid-shaped concave portion whose flat portion in contact with the positive electrode of the positive electrode container has an apex at the center of the flat portion from the outer peripheral portion toward the inner surface of the battery. By using a plate or a positive electrode container, it has become possible to provide a flat nonaqueous electrolyte battery having a stable battery thickness and internal resistance and excellent discharge performance.
【図１】本発明の実施例１である扁平形二酸化マンガン
リチウム一次電池の断面図。FIG. 1 is a cross-sectional view of a flat lithium manganese dioxide primary battery that is Embodiment 1 of the present invention.
【図２】図１の負極封口板の断面図。FIG. 2 is a cross-sectional view of the negative electrode sealing plate of FIG.
【図３】図１の正極容器の断面図。FIG. 3 is a cross-sectional view of the positive electrode container of FIG.
【図４】従来の負極封口板の断面図。FIG. 4 is a cross-sectional view of a conventional negative electrode sealing plate.
【図５】従来の正極容器の断面図。FIG. 5 is a cross-sectional view of a conventional positive electrode container.
【図６】本実施例に係る各種負極封口板の平面図。FIG. 6 is a plan view of various negative electrode sealing plates according to the present embodiment.
【図７】本発明に係る負極封口板の断面図。FIG. 7 is a sectional view of a negative electrode sealing plate according to the present invention.
【図８】本発明に係る正極容器の断面図。FIG. 8 is a sectional view of a positive electrode container according to the present invention.
１，１ａ，１ｂ，１ｃ，１ｄ…負極封口板、２…負極、
３…セパレータ、４…正極、５…封口パッキング、６，
６ａ…正極容器。1, 1a, 1b, 1c, 1d: negative electrode sealing plate, 2: negative electrode,
3: separator, 4: positive electrode, 5: sealing packing, 6,
6a: Positive electrode container.
フロントページの続き (72)発明者 早見 宗人 東京都品川区南品川三丁目４番10号 東芝 電池株式会社内 Ｆターム(参考） 5H011 AA03 BB04 CC06 DD03 KK01 5H024 AA03 AA10 AA11 BB05 CC03 DD01 DD02 HH13 Continued on the front page (72) Inventor Muneto Hayami 3-10-10 Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery Corporation F-term (reference) 5H011 AA03 BB04 CC06 DD03 KK01 5H024 AA03 AA10 AA11 BB05 CC03 DD01 DD02 HH13
Claims (3)
レータとからなる発電要素を、負極封口板と正極容器と
この間に介在する封口パッキングにより密閉された構造
を有する扁平形非水電解液電池において、負極封口板の
負極と接する平坦部がその外周部より電池内面側へ平坦
部中央が頂点となる多角錐状の凹部を有する負極封口
板、及び正極容器の正極と接する平坦部がその外周部よ
り電池内面側へ平坦部中央が頂点となる多角錐状の凹部
を有する正極容器の少なくともいずれか一方の負極封口
板または正極容器を用いることを特徴とした扁平形非水
電解液電池。A flat non-aqueous electrolyte having a structure in which a power generation element comprising a negative electrode, a positive electrode, and a separator impregnated with a non-aqueous electrolyte is sealed by a negative electrode sealing plate, a positive electrode container, and a sealing packing interposed therebetween. In the battery, the flat portion in contact with the negative electrode of the negative electrode sealing plate has a polygonal pyramid-shaped concave portion in which the center of the flat portion is a vertex from the outer peripheral portion to the inner surface of the battery, and the flat portion in contact with the positive electrode of the positive electrode container is A flat nonaqueous electrolyte battery characterized by using at least one of a negative electrode sealing plate and a positive electrode container of a positive electrode container having a polygonal pyramid-shaped concave portion having a flat portion centered at the vertex from the outer peripheral portion to the battery inner surface side.
０．２０ｍｍ以下のステンレス鋼材よりなる請求項１記
載の扁平形非水電解液電池。2. The flat nonaqueous electrolyte battery according to claim 1, wherein the negative electrode sealing plate and the positive electrode container are made of a stainless steel material having a thickness of 0.20 mm or less.
ら凹部頂点までの寸法値を０．０３から０．１１ｍｍと
した請求項1記載の扁平形非水電解液電池。3. The flat nonaqueous electrolyte battery according to claim 1, wherein a dimension value from the outer peripheral portion of the negative electrode sealing plate and the positive electrode container to the top of the concave portion is 0.03 to 0.11 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001058342A JP2002260599A (en) | 2001-03-02 | 2001-03-02 | Flat type nonaqueous electrolyte cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001058342A JP2002260599A (en) | 2001-03-02 | 2001-03-02 | Flat type nonaqueous electrolyte cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002260599A true JP2002260599A (en) | 2002-09-13 |
Family
ID=18918078
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001058342A Withdrawn JP2002260599A (en) | 2001-03-02 | 2001-03-02 | Flat type nonaqueous electrolyte cell |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002260599A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006147343A (en) * | 2004-11-19 | 2006-06-08 | Matsushita Electric Ind Co Ltd | Manufacturing method of flat organic electrolyte battery |
| US10490813B2 (en) | 2010-10-29 | 2019-11-26 | Kabushiki Kaisha Toshiba | Battery active material, nonaqueous electrolyte battery and battery pack |
-
2001
- 2001-03-02 JP JP2001058342A patent/JP2002260599A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006147343A (en) * | 2004-11-19 | 2006-06-08 | Matsushita Electric Ind Co Ltd | Manufacturing method of flat organic electrolyte battery |
| US10490813B2 (en) | 2010-10-29 | 2019-11-26 | Kabushiki Kaisha Toshiba | Battery active material, nonaqueous electrolyte battery and battery pack |
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