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JPH11260381A - Flat-type lithium battery - Google Patents

Flat-type lithium battery

Info

Publication number
JPH11260381A
JPH11260381A JP10060926A JP6092698A JPH11260381A JP H11260381 A JPH11260381 A JP H11260381A JP 10060926 A JP10060926 A JP 10060926A JP 6092698 A JP6092698 A JP 6092698A JP H11260381 A JPH11260381 A JP H11260381A
Authority
JP
Japan
Prior art keywords
positive electrode
battery
active material
electrode ring
flat
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
Application number
JP10060926A
Other languages
Japanese (ja)
Inventor
Junichi Shimizu
純一 清水
Akira Oyama
景 大山
Masami Suzuki
正美 鈴木
Munehito Hayami
宗人 早見
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FDK Twicell Co Ltd
Original Assignee
Toshiba Battery Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toshiba Battery Co Ltd filed Critical Toshiba Battery Co Ltd
Priority to JP10060926A priority Critical patent/JPH11260381A/en
Publication of JPH11260381A publication Critical patent/JPH11260381A/en
Pending legal-status Critical Current

Links

Classifications

    • Y02E60/12

Landscapes

  • Primary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)

Abstract

PROBLEM TO BE SOLVED: To prevent the exceeding of the specified overall height of a battery, in the amount of an active material increasing to increase the capacity and prevent drop in discharge capacity caused by the increase in internal resistance in a flat-type lithium battery. SOLUTION: A positive electrode ring 5 having generally L-shaped cross section of a flat-type lithium battery is improved such that at least four slits 5a are formed in the standing up part of the ring 5, the expansion of a positive active material 4 is balanced in the thickness direction and the diameter direction, the exceeding the specified overall height of the battery is prevented, and increase in internal resistance caused by less expansion in the thickness direction is also prevented. Forming eight slits each for every 45 deg. in the inner diameter direction is preferable, and the depth of the slit is preferably 1/2 or more of the overall height of the positive electrode ring.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、高容量化に対応す
る扁平型リチウム電池に関し、さらに詳しくは断面略L
字状の正極リングを改良した扁平型リチウム電池に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat type lithium battery capable of increasing capacity, and more particularly, to a flat lithium battery.
The present invention relates to a flat lithium battery having an improved positive electrode ring.

【0002】[0002]

【従来の技術】扁平型リチウム電池は、負極作用物質と
してリチウム金属或いはリチウム合金を用い、正極作用
物質として主に金属酸化物、硫化物、ハロゲン化物を用
い、非水電解液、セパレータ、断面略L字状の正極リン
グを有しており、断面略L字状の正極リング中に正極作
用物質が充填されている。
2. Description of the Related Art A flat lithium battery uses lithium metal or a lithium alloy as a negative electrode active material, mainly uses metal oxides, sulfides, and halides as a positive electrode active material, and uses a nonaqueous electrolyte, a separator, and a cross-sectional structure. It has an L-shaped positive electrode ring, and the positive electrode active substance is filled in a positive electrode ring having a substantially L-shaped cross section.

【0003】扁平型リチウム電池では、反応に伴い正極
作用物質中へリチウムイオンが侵入することにより正極
作用物質の体積が膨張するという特性を持っている。一
方、放電により負極作用物質は消耗していくので厚さ方
向に減少をきたし、この時正極作用物質の厚さ方向の膨
張が不十分であると、極間距離が拡大する。極間距離が
拡大すると電池の内部抵抗が上昇し、放電電圧の低下に
よる放電容量の減少が見られる。
[0003] The flat type lithium battery has a characteristic that the volume of the positive electrode active material expands due to the intrusion of lithium ions into the positive electrode active material during the reaction. On the other hand, since the negative electrode active material is consumed by the discharge, the thickness decreases in the thickness direction. At this time, if the positive electrode active material does not expand sufficiently in the thickness direction, the distance between the electrodes increases. When the distance between the electrodes increases, the internal resistance of the battery increases, and the discharge capacity decreases due to the decrease in the discharge voltage.

【0004】そこで、従来は断面略L字状の正極リング
を使用することにより、正極作用物質の径方向への膨張
を規制し、厚さ方向への膨張を促して、放電時の内部抵
抗上昇による放電電圧の低下を防いできた。
Therefore, conventionally, by using a positive electrode ring having a substantially L-shaped cross section, the expansion of the positive electrode active material in the radial direction is restricted, the expansion in the thickness direction is promoted, and the internal resistance rises during discharge. This has prevented the discharge voltage from being lowered.

【0005】そのほか、樹脂ガスケットの正極に当接す
る部分に他の部分より膨出した凸部をガスケットの正極
合剤当接部の円周全長に対し1/3以上の部分に形成さ
せ、正極作用物質の膨張方向を規制する方法もとられて
いた(特開平8−273640号)。
In addition, a convex portion swelling from the other portion of the resin gasket in contact with the positive electrode is formed in a portion which is at least 1/3 of the entire circumferential length of the positive electrode mixture contact portion of the gasket. A method of regulating the direction of expansion of a substance has been proposed (Japanese Patent Application Laid-Open No. 8-273640).

【0006】[0006]

【発明が解決しようとする課題】しかしながら、このよ
うな扁平型リチウム電池で電池の高容量化を行なう場合
には、作用物質の増量を一定の体積中で行なわなければ
ならないことから、正極作用物質の増量により放電中の
正極作用物質の膨脹量が増大する。その場合、従来の正
極リングによる正極作用物質の膨張方向の規制では、縦
方向のみに膨脹するようになっていることから、電池総
高が規定の寸法(JIS C8512による)を超えて
しまう。また、正極リングを使用しないで高容量化を行
なうと、正極作用物質の膨脹方向を規制できなくなるた
め、前述したように電池の内部抵抗が上昇し放電電圧の
低下により放電容量が減少してしまうという問題があ
る。したがって、厚さ方向と、径方向の膨張をバランス
良くさせる必要がある。
However, in order to increase the capacity of such a flat lithium battery, it is necessary to increase the amount of the active substance in a constant volume. Increases the amount of expansion of the positive electrode active material during discharge. In that case, in the conventional regulation of the expansion direction of the positive electrode active substance by the positive electrode ring, since the expansion is performed only in the vertical direction, the total battery height exceeds a specified dimension (according to JIS C8512). In addition, if the capacity is increased without using the positive electrode ring, the expansion direction of the positive electrode active material cannot be regulated, so that the internal resistance of the battery increases as described above, and the discharge voltage decreases, thereby decreasing the discharge capacity. There is a problem. Therefore, it is necessary to balance the expansion in the thickness direction with the expansion in the radial direction.

【0007】また、ガスケットの形状改良によって正極
作用物質の膨脹方向を規制する方法では、ガスケットの
正極合剤当接部の円周全長に1/3以上の凸部が形成し
てあるため、電池内容積が減少して作用物質の増量が行
なえなくなり、高容量化が図れなくなってしまう。さら
に、ガスケットの凸部は正極リングと同様の働きをする
ため、正極作用物質が厚さ方向のみ膨脹し、放電により
電池が膨れて規定の寸法を超えてしまう。また、これら
正極作用物質の膨脹は、電池ケースや封口板を半円状に
膨らましてしまうため、端子溶接を行なった電池は端子
外れが起こることもあった。
In the method of restricting the expansion direction of the positive electrode active substance by improving the shape of the gasket, since the convex portion of the gasket is formed with a convex portion of 1/3 or more over the entire circumferential length of the contact portion of the positive electrode mixture, the battery has As the internal volume decreases, the amount of the active substance cannot be increased, and the capacity cannot be increased. Further, since the convex portion of the gasket functions in the same manner as the positive electrode ring, the positive electrode active material expands only in the thickness direction, and the discharge expands the battery to exceed a specified size. In addition, since the expansion of the positive electrode active material causes the battery case and the sealing plate to expand in a semicircular shape, the terminal may be detached from the terminal-welded battery.

【0008】本発明は、これらの課題を解決するために
なされたもので、偏平型リチウム電池において、電池総
高が規定の寸法を超えることなく、また内部抵抗の上昇
により放電容量の低下をきたすことなく、高容量化を達
成することを目的としたものである。
The present invention has been made to solve these problems, and in a flat type lithium battery, the total battery height does not exceed a specified size, and the discharge capacity is reduced due to an increase in internal resistance. It is intended to achieve a high capacity without any problem.

【0009】[0009]

【課題を解決するための手段】本発明は、断面略L字状
正極リングの立ち上がり部に少なくとも4カ所の切り込
みを設けることによって上記課題を解決したものであっ
て、すなわち、リチウム金属或いはリチウム合金を作用
物質とする負極と、非水電解液と、セパレータと、正極
作用物質を有する正極と、この正極作用物質が充填され
ている断面略L字状の正極リングを有する扁平型リチウ
ム電池において、前記断面略L字状の正極リングの立ち
上がり部に少なくとも4カ所の切り込みが設けられてい
ることを特徴とする。
The present invention solves the above-mentioned problems by providing at least four cuts at the rising portion of the positive electrode ring having a substantially L-shaped cross section, that is, lithium metal or lithium alloy. In a flat lithium battery having a positive electrode ring having a substantially L-shaped cross section filled with the positive electrode active material, a non-aqueous electrolyte, a separator, a positive electrode having a positive electrode active material, At least four cuts are provided in a rising portion of the positive electrode ring having a substantially L-shaped cross section.

【0010】上記において、正極リング立ち上がり部の
切り込みは、内径方向に角度45度ごとに8カ所設けら
れている形態が好ましく、また切り込みの深さは正極リ
ング総高の1/2以上であることが好ましい。
In the above, it is preferable that the notches at the rising portion of the positive electrode ring are provided at eight positions at an angle of 45 degrees in the inner diameter direction, and the depth of the notch is not less than 1/2 of the total height of the positive electrode ring. Is preferred.

【0011】本発明では正極リングの立ち上がり部に切
り込みを設けることによって、正極作用物質の膨脹する
力で正極リングの立ち上がり部を外側へ変形させ、径方
向への規制を緩めるので、高容量化のために作用物質を
増量しても、正極作用物質が放電中に膨脹する方向を厚
さ方向と径方向とにバランス良く膨脹させることができ
る。したがって、本発明によれば、放電中の電池総高を
規定の寸法内に抑えながら電池の高容量化を図ることが
できる。また、電池の膨れにより発生していた端子外れ
も阻止することができる。
In the present invention, by providing a cut in the rising portion of the positive electrode ring, the rising portion of the positive electrode ring is deformed outward by the expanding force of the positive electrode active substance, and the regulation in the radial direction is relaxed. Therefore, even if the amount of the active substance is increased, the direction in which the positive electrode active substance expands during discharge can be expanded in a well-balanced manner in the thickness direction and the radial direction. Therefore, according to the present invention, it is possible to increase the capacity of the battery while keeping the total height of the battery during discharge within a specified dimension. In addition, the detachment of the terminal caused by the swelling of the battery can be prevented.

【0012】[0012]

【発明の実施の形態】(実施例1)以下本発明の実施例
について図1に示す扁平型二酸化マンガンリチウム電池
を例に説明する。図1は本発明による扁平型二酸化マン
ガンリチウム電池の要部断面図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) An embodiment of the present invention will be described below with reference to a flat type lithium manganese dioxide battery shown in FIG. FIG. 1 is a sectional view of a main part of a flat type lithium manganese dioxide battery according to the present invention.

【0013】この電池は、正極作用物質として450℃
で熱処理した二酸化マンガンに黒鉛を混合して正極合剤
とし、この合剤を2700mg秤量し一度に適度な大き
さに成形を行った後に本発明の正極リングに充填を行な
い、これを250℃にて乾燥してペレット状とし、正極
4として用いた。負極2には金属リチウムを厚み1.0
3mm、外径20mmに打ち抜いたものを用い、これを
封口板1の内底面に圧着した。電解液にはプロピレンカ
ーボネート、1,2−ジメトキシエタンの混合溶媒に、
LiClO4 を溶解させたものを使用した。これらを用
いて外径24mm高さ50mmの電池(CR2450)
を組み立てた。
This battery has a positive electrode working substance of 450 ° C.
The graphite was mixed with the manganese dioxide heat-treated in the above to prepare a positive electrode mixture, 2700 mg of this mixture was weighed and molded into an appropriate size at a time, and then filled into the positive electrode ring of the present invention. The resultant was dried to form a pellet and used as the positive electrode 4. The negative electrode 2 is made of metallic lithium having a thickness of 1.0.
A punched piece having a diameter of 3 mm and an outer diameter of 20 mm was pressure-bonded to the inner bottom surface of the sealing plate 1. For the electrolyte, propylene carbonate, a mixed solvent of 1,2-dimethoxyethane,
What dissolved LiClO 4 was used. Using these, a battery with an outer diameter of 24 mm and a height of 50 mm (CR2450)
Was assembled.

【0014】このとき使用した正極リング5を図2に示
す。この断面略L字状正極リングは、図2の(a)に示
すように、内径方向に角度45度ごとに8カ所切り込み
5aが設けられ、この切り込み5aは図2の(b)に示
すように正極リングの内底部までの深さがある。この電
池を実施例1とする。
FIG. 2 shows the positive electrode ring 5 used at this time. As shown in FIG. 2A, the positive electrode ring having a substantially L-shaped cross section is provided with eight cuts 5a at an angle of 45 degrees in the inner diameter direction, and the cuts 5a are formed as shown in FIG. Has a depth up to the inner bottom of the positive electrode ring. This battery is referred to as Example 1.

【0015】(実施例2)実施例1の正極リングと同様
に同じ角度で8カ所の切り込みを設け、ただし切り込み
の深さは正極リングの総高の1/2とした。それ以外は
実施例1と同様に電池を組み立てた。この電池を実施例
2とする。
Example 2 Eight cuts were provided at the same angle as in the positive electrode ring of Example 1, except that the depth of the cut was の of the total height of the positive electrode ring. Otherwise, the battery was assembled in the same manner as in Example 1. This battery is referred to as Example 2.

【0016】(実施例3)図3に示すように、正極リン
グの立ち上がり部に内径方向に角度90度ごとに4カ所
切り込み5aを設け、切り込みの深さは正極リングの内
底部までとした。それ以外は実施例1と同様にに電池を
組み立てた。この電池を実施例3とする。
Example 3 As shown in FIG. 3, four cuts 5a were provided at the rising portion of the positive electrode ring at an angle of 90 degrees in the radial direction, and the depth of the cut was up to the inner bottom of the positive electrode ring. Otherwise, the battery was assembled in the same manner as in Example 1. This battery is referred to as Example 3.

【0017】(実施例4)実施例1と同様に内径方向に
角度45度ごとに8カ所切り込み5aを設け、切り込み
の深さを正極リングの総高の1/3とした。それ以外は
実施例1と同様に電池を組み立てた。この電池を実施例
4とする。
(Embodiment 4) As in Embodiment 1, eight cuts 5a are provided at every 45 degrees in the radial direction, and the cut depth is set to 1/3 of the total height of the positive electrode ring. Otherwise, the battery was assembled in the same manner as in Example 1. This battery is referred to as Example 4.

【0018】(比較例1)正極リングの立ち上がり部に
内径方向に角度120度ごとに3カ所切り込みを設け、
切り込みの深さは正極リングの内底部までとした。それ
以外は実施例1と同様にに電池を組み立てた。この電池
を比較例1とする。
(Comparative Example 1) Three cuts are provided at the rising portion of the positive electrode ring at an angle of 120 degrees in the inner diameter direction,
The depth of the cut was made up to the inner bottom of the positive electrode ring. Otherwise, the battery was assembled in the same manner as in Example 1. This battery is referred to as Comparative Example 1.

【0019】(比較例2)従来の切り込みのない断面略
L字状の正極リングを用いて上記正極合剤を充填し、実
施例1同様に電池を組み立てた。この電池を比較例2と
する。
(Comparative Example 2) The above-mentioned positive electrode mixture was filled using a conventional positive electrode ring having a substantially L-shaped cross section without a cut, and a battery was assembled in the same manner as in Example 1. This battery is referred to as Comparative Example 2.

【0020】(比較例3)正極リングは用いずに上記正
極合剤のみで成形し、実施例1同様に電池を組み立て
た。この電池を比較例3とする。
(Comparative Example 3) A battery was assembled in the same manner as in Example 1 except that the positive electrode mixture was formed without using the positive electrode ring. This battery is referred to as Comparative Example 3.

【0021】(比較例4)樹脂ガスケットの正極に当接
する部分に他の部分より膨出した凸部をガスケットの正
極合剤当接部の円周全長に対し1/3以上の部分に形成
させたガスケットを用い、正極リングは用いずに上記正
極合剤のみで成形し、実施例1同様に電池を組み立て
た。この電池を比較例4とする。
(Comparative Example 4) At the portion of the resin gasket in contact with the positive electrode, a convex portion bulging out from the other portion is formed in a portion that is at least 1/3 of the entire circumferential length of the positive electrode mixture contact portion of the gasket. The battery was assembled in the same manner as in Example 1 using the above gasket and molding only with the above positive electrode mixture without using the positive electrode ring. This battery is referred to as Comparative Example 4.

【0022】以上のように形成した実施例及び比較例の
扁平型二酸化マンガンリチウム電池を、放電温度20
℃、負荷抵抗2.7kΩで連続放電し、終止電圧2.0
Vでの放電容量の比較を行なった。その結果を表1に示
す。なお、表1の結果はn=12の平均値である。
The flat type lithium manganese dioxide batteries of Examples and Comparative Examples formed as described above were discharged at a discharge temperature of 20.
Continuous discharge at 2.7 ° C, load resistance 2.7kΩ, cutoff voltage 2.0
The discharge capacity at V was compared. Table 1 shows the results. The results in Table 1 are average values of n = 12.

【0023】[0023]

【表1】 [Table 1]

【0024】表1の結果より明らかなように、実施例
1、実施例2、実施例3、実施例4、比較例1、比較例
2は、正極リングを用いない比較例3に比較して放電容
量が向上する結果になった。比較例3は正極作用物質の
膨脹方向を規制していないので正極作用物質の厚さ方向
の膨張が不十分になり、極間距離が拡大し、電池の内部
抵抗が上昇して放電電圧の低下により放電容量が減少し
た。比較例4ではガスケットの正極合剤当接部に円周全
長に対し1/3以上の凸部が形成してあって電池の内容
積が他の電池より少ないため、電池中の電解液量が少な
く正極作用物質の膨脹に伴い電解液が吸収され、放電容
量が減少した。
As is clear from the results in Table 1, Examples 1, 2, 3, 4, and Comparative Examples 1 and 2 are compared with Comparative Example 3 which does not use a positive electrode ring. As a result, the discharge capacity was improved. In Comparative Example 3, since the expansion direction of the positive electrode active material was not regulated, the positive electrode active material did not expand sufficiently in the thickness direction, the distance between the electrodes increased, the internal resistance of the battery increased, and the discharge voltage decreased. As a result, the discharge capacity decreased. In Comparative Example 4, since the convex portion of 1/3 or more of the entire circumferential length was formed at the positive electrode mixture contact portion of the gasket and the internal volume of the battery was smaller than other batteries, the amount of electrolyte in the battery was lower. The electrolyte solution was absorbed with the expansion of the positive electrode active material, and the discharge capacity was reduced.

【0025】次に、上記放電方法と同様の放電条件で放
電を行ない、放電中の電池総高の変化の比較を行なっ
た。その結果を表2に示す。なお、表2の結果はn=1
2の平均値である。
Next, discharge was performed under the same discharge conditions as in the above discharge method, and the change in the total battery height during the discharge was compared. Table 2 shows the results. The results in Table 2 show that n = 1
2 is the average value.

【0026】[0026]

【表2】 [Table 2]

【0027】表2に示すように実施例の電池では正極作
用物質の膨脹方向を規制しているため放電中の総高変化
が少なくなっている。実施例1の正極リングでは、正極
作用物質の膨脹する力で正極リングの立上がり部を外側
へ変形させることができたので、電池総高が規定値を越
えることはなかった。実施例2でも実施例1と比較する
と電池総高は高くなるが、規定値を越えることはなかっ
た。
As shown in Table 2, in the batteries of the examples, since the direction of expansion of the positive electrode active material is regulated, the change in the total height during discharge is small. In the positive electrode ring of Example 1, since the rising portion of the positive electrode ring could be deformed outward by the expanding force of the positive electrode active substance, the total battery height did not exceed the specified value. In Example 2, the total battery height was higher than that in Example 1, but did not exceed the specified value.

【0028】4カ所の切り込みを設けた実施例3でも、
正極作用物質の膨脹する力で正極リングの立ち上がり部
を外側へ変形させることができるので、電池総高が規定
値を越えることはなかった。実施例4では切り込みの深
さが1/3であるので、効果が十分ではなく、規定の寸
法を越えた。したがって、切り込みの深さは正極リング
の総高の1/2以上が好ましい。
In the third embodiment in which four cuts are provided,
Since the rising portion of the positive electrode ring can be deformed outward by the expanding force of the positive electrode active substance, the total battery height did not exceed the specified value. In Example 4, since the depth of the cut was 1/3, the effect was not sufficient, and the size exceeded the specified size. Therefore, the depth of the cut is preferably not less than の of the total height of the positive electrode ring.

【0029】比較例1の電池は内径方向に120度の角
度で3カ所の切り込みを設けたが、切り込み数が少な
く、正極作用物質の膨脹する力で正極リングの立上がり
部を外側へ変形させることができず、高さ方向に膨脹す
る合剤量が多くなり、電池総高が規定の寸法を越えた。
従来の正極リングを用いた比較例2の電池は、高容量化
を行うことはできるが、正極作用物質の膨脹が縦方向の
みの規制であるため、電池総高が最も高く、規定の寸法
を越えた。比較例3の電池は、正極作用物質の膨脹方向
が規制されていないため電池総高は高くならないが、こ
のことが原因で極間距離が拡大し、内部抵抗の上昇によ
り放電容量を低下させてしまっている。比較例4の電池
は、ガスケットの正極合剤当接部に円周全長に対し1/
3以上の凸部を形成し、径方向への膨脹を規制してある
ため、正極リングを使用したときと同様に径方向へは膨
脹せずに高さ方向へ膨脹してしまい、総高が規定の寸法
より高くなってしまった。
The battery of Comparative Example 1 was provided with three cuts at an angle of 120 degrees in the inner diameter direction. However, the number of cuts was small, and the rising portion of the positive electrode ring was deformed outward by the expanding force of the positive electrode active material. However, the amount of the mixture expanding in the height direction increased, and the total height of the battery exceeded the prescribed size.
The battery of Comparative Example 2 using the conventional positive electrode ring can increase the capacity, but since the expansion of the positive electrode active material is restricted only in the vertical direction, the total battery height is the highest and the specified size is reduced. Crossed. In the battery of Comparative Example 3, the total height of the battery did not increase because the direction of expansion of the positive electrode active material was not regulated, but this caused the distance between the electrodes to increase and the discharge capacity to decrease due to the increase in internal resistance. I'm done. In the battery of Comparative Example 4, the positive electrode mixture abutment portion of the gasket was 1/1 of the entire circumferential length.
Since three or more projections are formed and the expansion in the radial direction is restricted, it expands in the height direction without expanding in the radial direction as in the case of using the positive electrode ring, and the total height is reduced. It has become higher than the specified size.

【0030】[0030]

【発明の効果】以上説明したように、本発明では偏平型
リチウム電池において、断面略L字状の正極リングの立
ち上がり部に所定の切り込みを設けることによって、放
電中の正極作用物質を厚さ方向と、径方向とにバランス
良く膨脹させることができ、電池高容量化に伴う作用物
質の増量を行なった場合でも、総高が高くならず、また
内部抵抗の上昇により放電容量の低下をきたすこともな
い。さらに、従来のように電池が半円状に膨らむことが
なくなるため、端子外れを阻止することができる。
As described above, according to the present invention, in the flat lithium battery, a predetermined cut is provided at the rising portion of the positive electrode ring having a substantially L-shaped cross section so that the positive electrode active substance during discharge can be reduced in the thickness direction. In addition, it is possible to expand in a good balance in the radial direction, and even if the amount of the active substance is increased due to the increase in the capacity of the battery, the total height does not increase and the discharge capacity decreases due to an increase in the internal resistance. Nor. Further, since the battery does not swell in a semicircular shape as in the related art, it is possible to prevent the terminals from coming off.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明による扁平型リチウム電池の断面図であ
って、断面略L字状正極リングの立ち上がり部の凹部に
相当する位置の断面図。
FIG. 1 is a cross-sectional view of a flat type lithium battery according to the present invention, which is a cross-sectional view of a position corresponding to a concave portion of a rising portion of a substantially L-shaped positive ring.

【図2】本発明の一実施例の断面略L字状正極リング
の、(a)横断面図、(b)縦断面図。
2A and 2B are a cross-sectional view and a vertical cross-sectional view, respectively, of a positive electrode ring having a substantially L-shaped cross section according to an embodiment of the present invention.

【図3】本発明の他の実施例の断面略L字状正極リング
の、(a)横断面図、(b)縦断面図。
3A and 3B are a cross-sectional view and a vertical cross-sectional view, respectively, of a positive electrode ring having a substantially L-shaped cross section according to another embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1…封口板、2…負極作用物質、3…セパレータ、4…
正極作用物質、5…断面略L字状正極リング、5a…切
り込み、6…ガスケット、7…電池ケース。
DESCRIPTION OF SYMBOLS 1 ... Sealing plate, 2 ... Negative electrode active substance, 3 ... Separator, 4 ...
Positive electrode active material, 5: positive electrode ring having a substantially L-shaped cross section, 5a: cut, 6: gasket, 7: battery case.

───────────────────────────────────────────────────── 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 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Muneto Hayami 3-4-10 Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery Corporation

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 リチウム金属或いはリチウム合金を活物
質とする負極と、非水電解液と、セパレータと、正極作
用物質を有する正極と、この正極作用物質が充填されて
いる断面略L字状の正極リングを有する扁平型リチウム
電池において、前記断面略L字状の正極リングの立ち上
がり部に少なくとも4カ所の切り込みが設けられている
ことを特徴とする扁平型リチウム電池。
1. A negative electrode using a lithium metal or lithium alloy as an active material, a non-aqueous electrolyte, a separator, a positive electrode having a positive electrode active material, and a substantially L-shaped cross section filled with the positive electrode active material. A flat lithium battery having a positive electrode ring, wherein at least four cuts are provided in a rising portion of the positive electrode ring having a substantially L-shaped cross section.
【請求項2】 正極リングの立ち上がり部の切り込み
が、内径方向に角度45度ごとに8カ所設けられている
請求項1記載の扁平型リチウム電池。
2. The flat type lithium battery according to claim 1, wherein cuts at rising portions of the positive electrode ring are provided at eight positions at an angle of 45 degrees in the inner diameter direction.
【請求項3】 切り込みの深さは正極リング総高の1/
2以上である請求項1記載の扁平型リチウム電池。
3. The depth of the cut is 1 / the total height of the positive electrode ring.
The flat lithium battery according to claim 1, wherein the number is 2 or more.
JP10060926A 1998-03-12 1998-03-12 Flat-type lithium battery Pending JPH11260381A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10060926A JPH11260381A (en) 1998-03-12 1998-03-12 Flat-type lithium battery

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10060926A JPH11260381A (en) 1998-03-12 1998-03-12 Flat-type lithium battery

Publications (1)

Publication Number Publication Date
JPH11260381A true JPH11260381A (en) 1999-09-24

Family

ID=13156493

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10060926A Pending JPH11260381A (en) 1998-03-12 1998-03-12 Flat-type lithium battery

Country Status (1)

Country Link
JP (1) JPH11260381A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120106886A1 (en) * 2010-10-27 2012-05-03 Schaeffler Technologies Gmbh & Co. Kg Rolling bearing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120106886A1 (en) * 2010-10-27 2012-05-03 Schaeffler Technologies Gmbh & Co. Kg Rolling bearing
US8684608B2 (en) * 2010-10-27 2014-04-01 Schaeffler Technologies AG & Co. KG Rolling bearing

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