JPH067493B2 - Flat battery - Google Patents
Flat batteryInfo
- Publication number
- JPH067493B2 JPH067493B2 JP1484785A JP1484785A JPH067493B2 JP H067493 B2 JPH067493 B2 JP H067493B2 JP 1484785 A JP1484785 A JP 1484785A JP 1484785 A JP1484785 A JP 1484785A JP H067493 B2 JPH067493 B2 JP H067493B2
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- sealing plate
- battery
- diameter
- discharge
- 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.)
- Expired - Lifetime
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
- H01M6/04—Cells with aqueous electrolyte
- H01M6/06—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid
- H01M6/12—Dry cells, i.e. cells wherein the electrolyte is rendered non-fluid with flat electrodes
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Primary Cells (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、有機電解液電池、特に扁平形電池の改良に関
するものである。TECHNICAL FIELD The present invention relates to an improvement in an organic electrolyte battery, particularly a flat battery.
従来の技術 有機電解液電池は、高エネルギー密度を有し、保存性能
が他の電池系と比較して、数段すぐれている点から、近
年エレクトロニクス分野の発達とともに、各種エレクト
ロニクス機器の電源及びメモリーバックアップ用電源と
して注目をあびている。さらに、市場の要望として、軽
薄短小化及び高容量化が求められている。2. Description of the Related Art Organic electrolyte batteries have a high energy density and several stages better storage performance than other battery systems. It is attracting attention as a backup power source. Further, as market demands, lightness, thinness, shortness, and high capacity are required.
これまでの処法を採用し、高容量化した電池は、第５図
に示すような構成であった。第５図において、１は封口
板、２は負極活物質であるアルカリ金属であり、一般に
リチウムが用いられる。３はポリプロピレンよりなるセ
パレータ及び含浸材であり、過塩素酸リチウム，プロピ
レンカーボネイト，ジメトキシエタンよりなる有機電解
液を保持している。４は正極ペレットであり、一般に、
フッ化炭素又は二酸化マンガンが用いられている。５は
絶縁パッキングであり、ポリプロピレンよりなる。６は
正極端子を兼ねる電池ケース、７は集電体であり、バネ
形状を有している。この構成において、前記正極合剤の
径φ２は、前記封口板の平坦部内径φ１とほぼ同一であ
った。A battery having a high capacity by adopting the above-mentioned treatment has a structure as shown in FIG. In FIG. 5, 1 is a sealing plate, 2 is an alkali metal which is a negative electrode active material, and generally lithium is used. Reference numeral 3 is a separator and an impregnating material made of polypropylene, which holds an organic electrolytic solution made of lithium perchlorate, propylene carbonate, and dimethoxyethane. 4 is a positive electrode pellet, which is generally
Fluorocarbon or manganese dioxide is used. An insulating packing 5 is made of polypropylene. Reference numeral 6 is a battery case that also serves as a positive electrode terminal, and 7 is a current collector having a spring shape. In this configuration, the diameter φ 2 of the positive electrode mixture was substantially the same as the inner diameter φ 1 of the flat portion of the sealing plate.
発明が解決しようとする問題点 一般に、この種の扁平形有機電解液電池に使用される負
極活物質は、放電とともに電解液中に溶解する。それ故
に、負極反応面と正極の反応面との距離（以下極間距離
と呼ぶ）が大きくなり、放電中の内部抵抗の上昇及び異
常放電の問題があった。従来は、電池ケースにバネ形状
の集電体を溶接することで極間距離が広がる現象を防止
することが試みられていた。しかし、従来の構成法をそ
のまま用いると、放電初期に正極合剤ペレットがスペー
スのある径方向に膨張してセパレータを圧縮し、前記合
剤ペレットの外周上部が封口板の肩部８に当たり、放電
中期から末期にかけて、バネ集電体が本来有する効果を
発揮せず、適切な極間距離を得られなくなることから、
依然として、放電中の内部抵抗上昇及び異常放電の問題
を有していた。Problems to be Solved by the Invention Generally, the negative electrode active material used in this type of flat organic electrolyte battery dissolves in the electrolyte solution as it discharges. Therefore, the distance between the negative electrode reaction surface and the positive electrode reaction surface (hereinafter referred to as the inter-electrode distance) becomes large, and there is a problem of an increase in internal resistance during discharge and abnormal discharge. Conventionally, it has been attempted to prevent a phenomenon in which the distance between the electrodes is widened by welding a spring-shaped current collector to the battery case. However, if the conventional configuration method is used as it is, the positive electrode mixture pellet expands in the radial direction with a space at the initial stage of discharge to compress the separator, and the outer peripheral upper portion of the mixture pellet hits the shoulder portion 8 of the sealing plate to cause discharge. From the middle stage to the final stage, the spring current collector does not have the original effect, and it becomes impossible to obtain an appropriate inter-electrode distance.
It still had the problems of internal resistance increase during discharge and abnormal discharge.
本発明は、上記のような従来の問題点を解消し、放電中
に内部抵抗の上昇がなく、異常放電が起らない扁平形電
池を提供することを目的とする。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned conventional problems, and to provide a flat battery in which internal resistance does not increase during discharge and abnormal discharge does not occur.
問題点を解決するための手段 この問題点を解決するために、本発明は、放電による正
極合剤ペレットの膨張を考慮し、正極合剤ペレットの外
径を封口板平坦部内径よりも十分に小さくしたものであ
る。Means for Solving the Problems In order to solve this problem, the present invention considers the expansion of the positive electrode material mixture pellets due to discharge, and makes the outer diameter of the positive electrode material mixture pellets sufficiently larger than the inner diameter of the sealing plate flat portion. It is a small one.
作 用 この構成によれば、正極合剤ペレットの放電初期におけ
る径方向への膨張を考慮しているために、放電中期から
末期にかけても、正極合剤ペレットの直径が封口板の肩
部径よりも大きくならない。それ故に、放電による負極
活物質の溶解にともなう極間距離の拡大を電池ケースに
溶接されたバネ集電体で十分カバーすることが可能とな
り、放電末期にいたるまで、適切な極間距離が確保でき
る。従って放電中での内部抵抗の上昇及び異常放電とい
う現象はおこらなくなる。Operation According to this configuration, since the radial expansion of the positive electrode material mixture pellets is taken into consideration at the initial stage of discharge, the diameter of the positive electrode material mixture pellets is smaller than the shoulder portion diameter of the sealing plate even during the middle period to the final stage of discharge. Does not grow. Therefore, it is possible to fully cover the expansion of the inter-electrode distance due to the dissolution of the negative electrode active material due to discharge with the spring current collector welded to the battery case, and ensure an appropriate inter-electrode distance until the end of discharge. it can. Therefore, the phenomenon of increase in internal resistance during discharge and abnormal discharge do not occur.
実施例 以下本発明の実施例を第１図から第４図を参照して説明
する。Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4.
第１図は、本発明の扁平形有機電解液電池を示す。１は
厚さ０．３０mmのステンレス鋼を外径２２．７mm、高さ
２．１０mm、平坦部の内径２０．５mmに打抜き加工した
封口板、２は直径２０．０mm、厚さ０．５０mmのリチウ
ムシートからなる負極活物質で、前記封口板の平坦部に
圧着されている。３はポリプロピレンの不織布よりなる
セパレータで、厚さ０．４０mmのシートを直径２３．５
mmに打ち抜き、コップ状にして前記封口板に挿入してい
る。FIG. 1 shows the flat organic electrolyte battery of the present invention. 1 is a sealing plate made of 0.30 mm thick stainless steel with an outer diameter of 22.7 mm, a height of 2.10 mm, and an inner diameter of a flat portion of 20.5 mm. 2 is a diameter of 20.0 mm and a thickness of 0.50 mm. A negative electrode active material made of a lithium sheet, which is pressure-bonded to the flat portion of the sealing plate. 3 is a separator made of polypropylene non-woven fabric, a 0.40 mm thick sheet having a diameter of 23.5
It is punched out into a mm shape, and is made into a cup shape and inserted into the sealing plate.
４が正極合剤ペレットであり、正極活物質であるフッ化
炭素１００重量部に、アセチレンブラック１０重量部、
フッ素樹脂１４重量部を混合したものを重量４５０mgの
ペレット状に加圧成形したものであり、前記封口板平坦
部内径の９２．６％である１８．９０mmの直径、及び
１．３０mmの厚さを有している。4 is a positive electrode material mixture pellet, and 100 parts by weight of fluorocarbon which is a positive electrode active material, 10 parts by weight of acetylene black,
A mixture of 14 parts by weight of a fluororesin was pressure-molded into a pellet having a weight of 450 mg, which had a diameter of 18.90 mm, which was 92.6% of the inner diameter of the flat portion of the sealing plate, and a thickness of 1.30 mm. have.
５は絶縁パッキングであり、前記封口板と嵌合してあ
る。６は正極端子を兼ねる電池ケースであり、厚さ０．
３０mmのステンレス鋼を外径２４．４mm、高さ３．２mm
に打抜き加工している。７は集電体であり、幅１２．０
mm、厚さ０．１０mmのチタンシートを１２．０mm角に切
り、折り曲げてバネ状とし、前記電池ケース内底面に溶
接されている。さらに、その表面は、前記正極合剤ペレ
ットとの電気的接触を良好にする目的で、炭素被膜を形
成している。電解液には、１．２ジメトキシエタン，プ
ロピレンカーボネイトの等容積混合溶媒にホウフッ化リ
チウムを１モル／の割合で溶解したものを用いて、厚
さ３．０mm、直径２４．５mm、電気容量２７０mAhの電
池を形成した。Reference numeral 5 is an insulating packing, which is fitted with the sealing plate. Reference numeral 6 denotes a battery case which also serves as a positive electrode terminal and has a thickness of 0.
30mm stainless steel outer diameter 24.4mm, height 3.2mm
It is punched. 7 is a current collector, width 12.0
A titanium sheet having a thickness of 0.10 mm and a thickness of 0.10 mm is cut into 12.0 mm square pieces, bent into a spring shape, and welded to the inner bottom surface of the battery case. Further, the surface thereof is formed with a carbon coating for the purpose of improving electrical contact with the positive electrode material mixture pellets. The electrolyte used was a mixture of 1.2 volume of dimethoxyethane and propylene carbonate in which lithium borofluoride was dissolved at a ratio of 1 mol / thickness. The thickness was 3.0 mm, the diameter was 24.5 mm, and the electric capacity was 270 mAh. Formed a battery.
なお、実施例では、正極活物質としてフッ化炭素を用い
たが、他に、有機電解液電池の活物質として知られてい
る、酸化銅，硫化鉄，二酸化マンガン，クロム酸銀など
を導電材，結着剤とともに混合したものも同様に適用す
ることができる。In the examples, fluorocarbon was used as the positive electrode active material, but other known active materials for organic electrolyte batteries, such as copper oxide, iron sulfide, manganese dioxide, and silver chromate, are used as conductive materials. , Those mixed with a binder can be similarly applied.
第２図に従来の構成による正極合剤ペレット直径２０．
５０mmを用いた電池Ｂと、本発明による正極合剤ペレッ
ト直径１９．００mmを用いた電池Ａの２０℃１５ＫΩで
の放電時の電圧及び内部抵抗の推移を示す。図より明ら
かなように、本発明品は放電深度に関係なく内部抵抗が
安定している。一方、放電曲線も従来例のような二段曲
線を示していない。FIG. 2 shows a positive electrode material mixture pellet diameter 20.
3 shows changes in voltage and internal resistance of a battery B using 50 mm and a battery A using a positive electrode material mixture pellet diameter of 19.00 mm according to the present invention when discharged at 20 ° C. and 15 KΩ. As is clear from the figure, the internal resistance of the product of the present invention is stable regardless of the depth of discharge. On the other hand, the discharge curve does not show a two-step curve as in the conventional example.
第３図，第４図は、それぞれ、実施例及び従来例電池の
２０℃，１５ＫΩの放電後の電池断面であり、従来例で
は、正極合剤ペレットが封口板肩部の下まで膨張し、バ
ネ集電体の効果が失なわれているのに対し、本実施例で
は、正極合剤ペレット直径が封口板平坦部内径とほぼ同
じであり、バネ集電体の効果が十分に発揮され、適切な
極間距離が得られている。FIG. 3 and FIG. 4 are cross-sectional views of the batteries of Examples and Conventional Example after discharging at 20 ° C. and 15 KΩ, respectively. In the Conventional Example, the positive electrode material mixture pellet expands to the bottom of the sealing plate shoulder, While the effect of the spring current collector is lost, in this embodiment, the positive electrode mixture pellet diameter is almost the same as the inner diameter of the flat portion of the sealing plate, and the effect of the spring current collector is sufficiently exerted. The proper gap distance is obtained.
本発明の正極合剤ペレット直径の有効範囲を決定するた
めに、合剤ペレット直径を、２１．０，２０．５，２
０．０，１９．５，１９．０，１８．５，１８．０，１
７．５mmの８ポイントにふり、２０℃，１５ＫΩ放電中
での内部抵抗の上昇及び異常放電の状態を確認した。そ
の結果は、次表のとおりであった。In order to determine the effective range of the positive electrode mixture pellet diameter of the present invention, the mixture pellet diameter is set to 21.0, 20.5, 2.
0.0, 19.5, 19.0, 18.5, 18.0, 1
By touching 8 points of 7.5 mm, the rise of internal resistance and the state of abnormal discharge during discharge at 20 ° C. and 15 KΩ were confirmed. The results are shown in the table below.
以上の結果より、正極合剤ペレット直径が、封口板平坦
部内径の９３％未満である電池の放電において、内部抵
抗の上昇及び異常放電はおこらない。 From the above results, the internal resistance does not increase and abnormal discharge does not occur in the discharge of the battery in which the positive electrode material mixture pellet diameter is less than 93% of the inner diameter of the flat portion of the sealing plate.
発明の効果 以上の説明から明らかなように、正極合剤ペレット直径
が封口板平坦部内径の９３％未満の構成を有する本発明
の電池は、放電中において、正負極の極間距離が拡大す
ることがなく、内部抵抗の上昇、異常放電はおこらず、
安定した放電性能が得られる。EFFECTS OF THE INVENTION As is clear from the above description, in the battery of the present invention having a configuration in which the positive electrode material mixture pellet diameter is less than 93% of the inner diameter of the flat portion of the sealing plate, the distance between the positive electrode and the negative electrode increases during discharging. No increase in internal resistance, no abnormal discharge occurs,
Stable discharge performance can be obtained.
第１図は本発明の実施例における扁平形電池の縦断面
図、第２図は放電時の電圧及び内部抵抗の比較図、第３
図は本実施例における扁平形電池の放電後の縦断面図、
第４図は従来例の扁平形電池の放電後の縦断面図、第５
図は従来例の扁平形電池の縦断面図である。 １……封口板、２……負極、３……セパレータ、４……
正極、５……絶縁パッキング、６……電池ケース、７…
…集電体、８……肩部。FIG. 1 is a vertical cross-sectional view of a flat battery according to an embodiment of the present invention, FIG. 2 is a comparative diagram of voltage and internal resistance during discharge, and FIG.
The figure is a vertical cross-sectional view after discharging the flat battery in this example,
FIG. 4 is a vertical cross-sectional view of a conventional flat battery after discharging, FIG.
The figure is a vertical cross-sectional view of a conventional flat battery. 1 ... Sealing plate, 2 ... Negative electrode, 3 ... Separator, 4 ...
Positive electrode, 5 ... Insulating packing, 6 ... Battery case, 7 ...
… Current collector, 8 …… shoulder.
Claims (1)
物質と、その上部にセパレータと、前記封口板の平坦部
直径の９３％未満の外径を有する正極ペレットと、有機
電解液を配し、これら発電要素を前記封口板と、バネ状
集電体を溶接した正極端子を兼ねる電池ケースとの間に
絶縁パッキングを介在させて密封した扁平形電池。1. A negative electrode active material, which is pressure-bonded to a sealing plate that also serves as a negative electrode terminal, a separator, a positive electrode pellet having an outer diameter of less than 93% of the flat portion diameter of the sealing plate, and an organic electrolyte solution. Then, a flat battery in which these power generating elements are sealed by interposing an insulating packing between the sealing plate and a battery case which also functions as a positive electrode terminal to which a spring-shaped current collector is welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1484785A JPH067493B2 (en) | 1985-01-29 | 1985-01-29 | Flat battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1484785A JPH067493B2 (en) | 1985-01-29 | 1985-01-29 | Flat battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61176072A JPS61176072A (en) | 1986-08-07 |
| JPH067493B2 true JPH067493B2 (en) | 1994-01-26 |
Family
ID=11872426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1484785A Expired - Lifetime JPH067493B2 (en) | 1985-01-29 | 1985-01-29 | Flat battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH067493B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8043740B2 (en) | 2007-03-19 | 2011-10-25 | Hitachi Maxell Energy, Ltd. | Flat-shaped battery |
| WO2014076894A1 (en) | 2012-11-19 | 2014-05-22 | パナソニック株式会社 | Flat battery |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5400451B2 (en) * | 2008-04-18 | 2014-01-29 | パナソニック株式会社 | Negative electrode for lithium primary battery and lithium primary battery |
-
1985
- 1985-01-29 JP JP1484785A patent/JPH067493B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8043740B2 (en) | 2007-03-19 | 2011-10-25 | Hitachi Maxell Energy, Ltd. | Flat-shaped battery |
| WO2014076894A1 (en) | 2012-11-19 | 2014-05-22 | パナソニック株式会社 | Flat battery |
| US9577238B2 (en) | 2012-11-19 | 2017-02-21 | Panasonic Intellectual Property Management Co., Ltd. | Flat-shaped battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61176072A (en) | 1986-08-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |