JP2002298803A - Flat nonaqueous electrolyte secondary battery - Google Patents
Flat nonaqueous electrolyte secondary batteryInfo
- Publication number
- JP2002298803A JP2002298803A JP2001097753A JP2001097753A JP2002298803A JP 2002298803 A JP2002298803 A JP 2002298803A JP 2001097753 A JP2001097753 A JP 2001097753A JP 2001097753 A JP2001097753 A JP 2001097753A JP 2002298803 A JP2002298803 A JP 2002298803A
- Authority
- JP
- Japan
- Prior art keywords
- electrolyte secondary
- secondary battery
- negative electrode
- positive electrode
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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質二
次電池に係わり、特に貯蔵特性及び信頼性並びに重負荷
放電特性に優れた扁平形非水電解質二次電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat non-aqueous electrolyte secondary battery, and more particularly to a flat non-aqueous electrolyte secondary battery excellent in storage characteristics, reliability and heavy load discharge characteristics.
【０００２】[0002]
【従来の技術】正極作用物質にＭｎＯ2やＶ2Ｏ5等の金
属酸化物、あるいはフッ化黒鉛等の無機化合物、あるい
はポリアニリンやポリアセン構造体等の有機化合物を用
い、負極に金属リチウム、あるいはリチウム合金、ある
いはポリアセン構造体等の有機化合物、あるいはリチウ
ムを吸蔵、放出可能な炭素質材料、あるいはチタン酸リ
チウムやリチウム含有珪素酸化物のような酸化物を用
い、電解質にプロピレンカーボネート、エチレンカーボ
ネート、ブチレンカーボネート、ジエチルカーボネー
ト、ジメチルカーボネート、メチルエチルカーボネー
ト、ジメトキシエタン、γ−ブチルラクトン等の非水溶
媒にＬｉＣｌＯ4、ＬｉＰＦ6、ＬｉＣＦ3ＳＯ3、ＬｉＮ
（ＣＦ3ＳＯ2）2、ＬｉＮ（Ｃ2Ｆ5ＳＯ2）2等の支持塩
を溶解した非水電解質を用いたコイン形やボタン形の扁
平形非水電解質二次電池は、数〜数十μＡ程度の軽負荷
で放電を行われるＳＲＡＭのバックアップや、腕時計の
主電源等に用いられている。BACKGROUND ART cathode agent to MnO 2 and V 2 O 5 or the like of the metal oxide, or inorganic compounds such as fluorinated graphite, or using polyaniline or polyacene structure such as an organic compound of a metal lithium on the negative electrode or, Lithium alloy, or an organic compound such as a polyacene structure, or a carbonaceous material capable of absorbing and releasing lithium, or an oxide such as lithium titanate or lithium-containing silicon oxide, and propylene carbonate, ethylene carbonate, LiClO 4 , LiPF 6 , LiCF 3 SO 3 , LiN in a non-aqueous solvent such as butylene carbonate, diethyl carbonate, dimethyl carbonate, methyl ethyl carbonate, dimethoxyethane, and γ-butyl lactone
A coin-shaped or button-shaped flat non-aqueous electrolyte secondary battery using a non-aqueous electrolyte in which a supporting salt such as (CF 3 SO 2 ) 2 or LiN (C 2 F 5 SO 2 ) 2 is dissolved has several to several It is used as a backup for an SRAM that discharges at a light load of about 10 μA, a main power supply of a wristwatch, and the like.
【０００３】これら従来のコイン形やボタン形の扁平形
非水電解質二次電池は製造が簡便であり、量産性に優
れ、長期信頼性や安全性に優れるという長所をもち、さ
らに構造が簡便なので小型化が可能である。[0003] These conventional coin-shaped or button-shaped flat non-aqueous electrolyte secondary batteries have the advantages of simple manufacture, excellent mass productivity, long-term reliability and safety, and the simple structure. Miniaturization is possible.
【０００４】しかしその反面、電極面積が制限されるた
め中〜重負荷放電は不可能であり、小型電池のニーズが
大きい携帯電話やＰＤＡ等の情報端末の主電源としては
採用することができなかった。However, on the other hand, medium to heavy load discharge is impossible due to the limited electrode area, and it cannot be used as a main power source for information terminals such as mobile phones and PDAs, which have a large need for small batteries. Was.
【０００５】そこで、本発明者らは種々実験した結果、
電池形状は変更せず、電極面積を大きくすることで重負
荷放電が可能なコイン形やボタン形の扁平形非水電解質
二次電池を提供することができた。すなわち、この扁平
形非水電解質二次電池は扁平形電池の扁平面に垂直な方
向の断面を見た場合に、少なくとも３面以上の正極と負
極がセパレータを介し対向している正負極対向面を有す
る電極群を配し、かつ電極群内の正負極対向面積の総和
を絶縁ガスケットの開口面積よりも大きくすることで重
負荷放電特性を著しく向上させたものである。Therefore, the present inventors have conducted various experiments, and as a result,
A coin-shaped or button-shaped flat non-aqueous electrolyte secondary battery capable of heavy-load discharge can be provided by increasing the electrode area without changing the battery shape. That is, when the cross section of the flat nonaqueous electrolyte secondary battery is viewed in a direction perpendicular to the flat surface of the flat battery, at least three or more positive and negative electrodes face each other with a separator interposed therebetween. The heavy load discharge characteristics are remarkably improved by arranging an electrode group having the following formula, and making the sum of the positive and negative electrode facing areas in the electrode group larger than the opening area of the insulating gasket.
【０００６】この扁平形非水電解質二次電池の集電方法
は、捲回した電極の最外周の対向面に正極端子及び負極
端子を露出させて、それぞれ正極ケース、負極ケースと
接触させ、集電を取る方法がなされている。しかしなが
ら、このような電池は捲回した時に、最外周の電極側面
にも正・負極端子が露出する場合があり、製造後、ある
いは長期貯蔵後において、振動により側面に露出した正
負極端子が、他の正負極ケースに接触することによる内
部短絡を引き起こす危険性があった。[0006] In this method of collecting current of a flat nonaqueous electrolyte secondary battery, the positive electrode terminal and the negative electrode terminal are exposed on the outermost opposing surfaces of the wound electrodes, and are brought into contact with the positive electrode case and the negative electrode case, respectively. There is a way to take electricity. However, when such a battery is wound, the positive / negative terminals may be exposed also on the outermost electrode side surfaces, and after manufacturing or after long-term storage, the positive / negative terminals exposed on the side surfaces due to vibrations are: There was a risk of causing an internal short circuit due to contact with another positive / negative electrode case.
【０００７】また、前記正負極端子と正負極ケースの接
触は単なる接触、あるいは導電性接着剤による接着等に
よるものであったが、実際には接着剤自体も長期、また
は高温による貯蔵ではその接着剤の劣化により接着持続
性という観点からは十分なものではなく、内部短絡を引
き起こしてしまうという問題点に対しては十分な効果は
挙げられなかった。In addition, the contact between the positive and negative electrode terminals and the positive and negative electrode cases is based on mere contact or adhesion with a conductive adhesive. It is not sufficient from the viewpoint of adhesion durability due to the deterioration of the agent, and no sufficient effect has been given to the problem of causing an internal short circuit.
【０００８】[0008]
【発明が解決しようとする課題】本発明は上記状況に鑑
みてなされたもので、輸送などの振動により電池内部で
短絡することなく、また長期間における貯蔵性能を確保
できる扁平形非水電解質二次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 view of the above circumstances, and has a flat non-aqueous electrolyte capable of ensuring a long-term storage performance without short-circuiting inside a battery due to vibrations during transportation or the like. It is intended to provide a secondary battery.
【０００９】[0009]
【課題を解決するための手段】上記課題を解決するため
に、本発明の請求項１は負極端子を兼ねる金属製の負極
ケースと、正極端子を兼ねる金属製の正極ケースが、絶
縁ガスケットを介し嵌合され、さらに該絶縁ガスケット
を前記正極ケースが径方向及び高さ方向に圧縮するかし
め加工によりかしめられた封口構造を有し、その内部に
リチウム含有酸化物の正極、及び炭素質材料の負極をセ
パレータを介して、帯状に捲回又は多層積層した電極群
を非水電解質とともに内包した扁平形非水電解質二次電
池において、前記ガスケットの少なくとも一部が、前記
電極群を保持するように突起を設けたことを特徴とす
る。In order to solve the above-mentioned problems, a first aspect of the present invention is to provide a metal negative electrode case also serving as a negative electrode terminal and a metal positive electrode case also serving as a positive electrode terminal via an insulating gasket. The positive electrode case has a sealing structure in which the insulating gasket is fitted and caulked by caulking to compress the insulating gasket in a radial direction and a height direction, and a positive electrode made of a lithium-containing oxide and a negative electrode made of a carbonaceous material therein. Through a separator, in a flat non-aqueous electrolyte secondary battery including a non-aqueous electrolyte containing a group of electrodes wound in a band or in a multilayer configuration, at least a part of the gasket is projected so as to hold the electrode group. Is provided.
【００１０】本発明の請求項２は、請求項１記載の扁平
形非水電解質二次電池において、前記電極群を保持する
前記絶縁ガスケットの突起の高さをａ、前記電極群の高
さをｂとするとき、前記絶縁ガスケットの少なくとも一
部がａ＜ｂの関係にあることを特徴とする。According to a second aspect of the present invention, in the flat nonaqueous electrolyte secondary battery according to the first aspect, the height of the protrusion of the insulating gasket holding the electrode group is a, and the height of the electrode group is When b, at least a part of the insulating gasket has a relation of a <b.
【００１１】本発明は、上述のようにリチウム含有酸化
物の正極、および炭素質材料の負極をセパレータを介し
て、帯状に捲回又は、多層積層した電極群が非水電解質
とともに内包した扁平形非水電解質二次電池において、
その電極群として捲回した電極の最外周の対向面に正極
端子及び負極端子を露出させて、それぞれ正極ケース、
負極ケースと接触させるような電池構造とすることで、
製造後あるいは長期貯蔵後において、輸送等による振動
があった場合でも、正負極端子が対向する正負極ケース
に接触することによる内部短絡を防止するものである。According to the present invention, as described above, a flat electrode in which a positive electrode made of a lithium-containing oxide and a negative electrode made of a carbonaceous material are wound in a belt shape through a separator or a multi-layered electrode group is included together with a non-aqueous electrolyte. In non-aqueous electrolyte secondary batteries,
A positive electrode terminal and a negative electrode terminal are exposed on the outermost facing surface of the electrode wound as the electrode group, and a positive electrode case,
By making the battery structure to be in contact with the negative electrode case,
Even if there is vibration due to transportation or the like after manufacturing or after long-term storage, an internal short circuit due to the positive and negative electrode terminals coming into contact with the opposite positive and negative electrode cases is prevented.
【００１２】[0012]
【発明の実施の形態】以下、本発明の実施例及び比較例
について詳細に説明する。 （実施例１）図１は本発明の実施例１の扁平形非水電解
質二次電池の構成図であり、同図（ａ）は同図（ｂ）の
Ｘ−Ｘの断面図、同図（ｂ）は上面からの透視図であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention and comparative examples will be described in detail. (Embodiment 1) FIG. 1 is a structural view of a flat non-aqueous electrolyte secondary battery according to Embodiment 1 of the present invention. FIG. 1A is a sectional view taken along line XX of FIG. (B) is a perspective view from above.
【００１３】図に示すように、正極板２を負極板４の間
にセパレータ３を介して渦巻状に捲回し、正極ケース１
内に収納する。絶縁ガスケット６を一体化した負極金属
ケース５の内底面に負極板４に接するように載置して、
正極ケース１を内方向にかしめ加工を実施して扁平形非
水電解質二次電池とする。６ｃは絶縁ガスケットの突起
部である。As shown in the figure, a positive electrode plate 2 is spirally wound between a negative electrode plate 4 and a separator 3 with a positive electrode case 1 therebetween.
Housed inside. The insulating gasket 6 is placed on the inner bottom surface of the negative electrode metal case 5 integrated with the insulating gasket 6 so as to be in contact with the negative electrode plate 4.
The positive electrode case 1 is caulked inward to obtain a flat nonaqueous electrolyte secondary battery. 6c is a projection of the insulating gasket.
【００１４】以下、本実施例1の電池の製造方法を説明
する。まず、ＬｉＣｏＯ2１００質量部に対し導電剤と
してアセチレンブラック５質量部と黒鉛粉末５質量部を
加え、結着剤としてポリフッ化ビニリデンを５質量部加
え、Ｎ−メチルピロリドンで希釈，混合し、スラリー状
の正極合剤を得た。次にこの正極合剤を、正極集電体で
ある厚さ０．０２ｍｍのアルミ箔の両面にドクターブレ
ード法により塗工，乾燥を行い、正極作用物質含有層の
塗膜厚さが両面で０．１５ｍｍの両面塗工正極を作製し
た。次に、この電極体の片面の端から１０ｍｍ部分の作
用物質含有層を除去し、アルミ層を剥き出しにして通電
部とし、幅１５ｍｍ，長さ１２０ｍｍに切り出し正極板
２を作製した。Hereinafter, a method for manufacturing the battery of the first embodiment will be described. First, to 100 parts by mass of LiCoO 2 , 5 parts by mass of acetylene black and 5 parts by mass of graphite powder were added as conductive agents, 5 parts by mass of polyvinylidene fluoride was added as a binder, and the mixture was diluted and mixed with N-methylpyrrolidone. A positive electrode mixture was obtained. Next, this positive electrode mixture is applied and dried by a doctor blade method on both surfaces of a 0.02 mm thick aluminum foil as a positive electrode current collector, and the coating thickness of the positive electrode active substance-containing layer is reduced to 0 on both surfaces. A .15 mm double-sided coated positive electrode was produced. Next, a 10 mm portion of the active substance-containing layer was removed from the end of one side of the electrode body, and the aluminum layer was stripped to serve as a current-carrying part. The positive electrode plate 2 was cut out to a width of 15 mm and a length of 120 mm.
【００１５】次に、黒鉛化メソフェーズピッチ炭素繊維
粉末１００質量部に結着剤としてスチレンブタジエンゴ
ム（ＳＢＲ）とカルボキシメチルセルロース（ＣＭＣ）
をそれぞれ２．５質量部を添加し、イオン交換水で希
釈，混合し、スラリー状の負極合剤を得た。得られた負
極合剤を負極集電体である厚さ０．０２ｍｍの銅箔両面
にドクターブレード法により塗工，乾燥を行い、作用物
質含有層の厚さが０．１５ｍｍの両面塗工負極を作製し
た。次に、この電極体の片面の端から１０ｍｍ部分の作
用物質含有層を除去し、銅層を剥き出しにして通電部と
し、幅１５ｍｍ，長さ１２０ｍｍに切り出した負極板４
を作製した。Next, styrene-butadiene rubber (SBR) and carboxymethyl cellulose (CMC) were used as binders in 100 parts by mass of the graphitized mesophase pitch carbon fiber powder.
Was added and mixed with ion-exchanged water to obtain a slurry-like negative electrode mixture. The obtained negative electrode mixture is applied and dried by a doctor blade method on both surfaces of a copper foil having a thickness of 0.02 mm as a negative electrode current collector, and a double-sided coated negative electrode having an active substance-containing layer having a thickness of 0.15 mm is applied. Was prepared. Next, the negative electrode plate 4 cut out to a width of 15 mm and a length of 120 mm by removing the active material-containing layer of 10 mm from the end of one side of the electrode body and exposing the copper layer to form a current-carrying part.
Was prepared.
【００１６】次に、正負極板通電部面を外周巻き終わり
側とし、これら正極板２と負極板４の間に厚さ２５μｍ
のポリエチレン微多孔膜からなるセパレータ３を介して
渦巻状に捲回し、扁平形電池の扁平面に対し水平方向に
正負極対向部をもつように一定方向に捲回電極の中心部
の空間がなくなるまで加圧した。作製した電極群を８５
℃で１２ｈ乾燥した後、絶縁ガスケット６を一体化した
負極金属ケース５の内底面に電極群の負極板の作用物質
含有層除去部が接するように配置した。エチレンカーボ
ネートとメチルエチルカーボネートを体積比１：１の割
合で混合した溶媒に支持塩としてＬｉＰＦ6を１ｍｏｌ
／ｌの割合で溶解せしめた非水電解質を注液し、さらに
電極群の正極板の作用物質含有層除去部に接するように
ステンレス製の正極ケース１を嵌合し、上下反転後、正
極ケース１に径方向および高さ方向のかしめ加工を実施
し、封口し、外径２４ｍｍ，高さ３．０ｍｍの実施例１
の扁平形非水電解質二次電池を３００個作製した。な
お、実施例１における絶縁ガスケット６には電極群を保
持することを目的として突起部６ｃをあらかじめ設けた
ものを使用する。Next, the current-carrying surface of the positive and negative electrode plates is set to the outermost winding end side, and a thickness of 25 μm
Spirally wound through a separator 3 composed of a microporous polyethylene film, and the space at the center of the wound electrode is eliminated in a certain direction so as to have the positive and negative electrode facing portions in the horizontal direction with respect to the flat surface of the flat battery. Pressurized. 85 prepared electrode groups
After drying at 12 ° C. for 12 hours, the negative electrode metal case 5 in which the insulating gasket 6 was integrated was placed so that the active substance-containing layer removed portion of the negative electrode plate of the electrode group was in contact with the inner bottom surface. 1 mol of LiPF 6 as a supporting salt in a solvent in which ethylene carbonate and methyl ethyl carbonate are mixed at a volume ratio of 1: 1
/ L of a non-aqueous electrolyte dissolved at a rate of 1 / l, and a stainless steel positive electrode case 1 is fitted so as to be in contact with the active substance-containing layer removed portion of the positive electrode plate of the electrode group. Example 1 was subjected to a caulking process in the radial direction and the height direction and sealed, and the first example having an outer diameter of 24 mm and a height of 3.0 mm.
300 flat non-aqueous electrolyte secondary batteries were manufactured. The insulating gasket 6 according to the first embodiment is provided with a projection 6c in order to hold an electrode group.
【００１７】（実施例２）図２は本発明の実施例２の扁
平形非水電解質二次電池の構成図であり、同図（ａ）は
同図（ｂ）のＸ−Ｘの断面図、同図（ｂ）は上面からの
透視図、図３（ａ）は図２（ｂ）のＢ方向からの透視
図、図３（ｂ）は図２（ｂ）のＸ１−Ｘ１の断面図であ
る。(Embodiment 2) FIG. 2 is a structural view of a flat nonaqueous electrolyte secondary battery according to Embodiment 2 of the present invention, and FIG. 2A is a sectional view taken along line XX of FIG. 3 (b) is a perspective view from the top, FIG. 3 (a) is a perspective view from the direction B in FIG. 2 (b), and FIG. 3 (b) is a view of X 1 -X 1 in FIG. 2 (b). It is sectional drawing.
【００１８】図に示すように、本実施例２の扁平形非水
電解質二次電池は電極群の４頂点を保持するように、絶
縁ガスケット６を配置しており、絶縁ガスケット６の突
起部の高さａに対し、電極群の高さｂとした時に、絶縁
ガスケットの少なくとも一部がａ＜ｂになるように欠足
部６ｄを設けた絶縁ガスケット６を用いた以外は実施例
１と同様の実施例２の電池を３００個作製した。As shown in the figure, the flat non-aqueous electrolyte secondary battery of the second embodiment is provided with an insulating gasket 6 so as to hold four vertices of an electrode group. Same as Example 1 except that when the height b of the electrode group was set to the height a, at least a part of the insulating gasket was provided with the missing foot portion 6d such that a <b. Of Example 2 were produced.
【００１９】（比較例１）図４は比較例１の扁平形非水
電解質二次電池の構成図であり、同図（ａ）は同図
（ｂ）のＸ−Ｘの断面図、同図（ｂ）は上面からの透視
図である。(Comparative Example 1) FIG. 4 is a structural view of a flat nonaqueous electrolyte secondary battery of Comparative Example 1, and FIG. 4A is a sectional view taken along line XX of FIG. (B) is a perspective view from above.
【００２０】図に示すように、比較例１の扁平形非水電
解質二次電池は電極群を保持することなく、通常の絶縁
ガスケット６を配置している以外は実施例１と同様の比
較例１の電池を３００個作製した。As shown in the figure, the flat nonaqueous electrolyte secondary battery of Comparative Example 1 is the same as Comparative Example 1 except that a normal insulating gasket 6 is provided without holding an electrode group. 300 batteries were manufactured.
【００２１】（比較例２）比較例１の電極群を導電性接
着剤により固定した以外は比較例１と同様の、比較例２
の電池を３００個作製した。Comparative Example 2 Comparative Example 2 was the same as Comparative Example 1 except that the electrode group of Comparative Example 1 was fixed with a conductive adhesive.
300 batteries were manufactured.
【００２２】（比較例３）実施例２において、絶縁ガス
ケット６の突起部の高さａに対し、電極高さｂとした時
に、絶縁ガスケット６に欠足部６ｄが全くなく、全周に
わたりａ＝ｂの関係になるような絶縁ガスケット６を用
いた以外は実施例１と同様の、比較例３の電池を３００
個作製した。(Comparative Example 3) In Example 2, when the electrode height b is set with respect to the height a of the protrusion of the insulating gasket 6, the insulating gasket 6 has no missing portions 6d, and a = B, the battery of Comparative Example 3 was replaced with the same battery as in Example 1, except that the insulating gasket 6 was used.
This was produced.
【００２３】上記実施例１，実施例２及び比較例１，比
較例２，比較例３の電池について、製造直後、及び６０
℃１００日貯蔵後において包装貨物−評価試験方法通則
Ｚ０２００に準拠し、振動数５〜５０Ｈｚ，ピーク加速
度７．３５ｍ／ｓ2で２０分間試験を実施し、各試験前
後においての開路電圧を測定し、測定値として１００ｍ
Ｖ以上の変動があったものを試験中に内部ショートが発
生したものと判断し、不良とカウントした。The batteries of Examples 1 and 2 and Comparative Examples 1, 2 and 3 were obtained immediately after the production and at 60%.
° C. 100 days packaging cargo after storage - conforming to the evaluation test method General Rules Z0200, frequency 5～50Hz, performed 20 minute test at peak acceleration 7.35m / s 2, to measure the open circuit voltage of the before and after each test 100m as measured value
If there was a change of V or more, it was judged that an internal short-circuit occurred during the test, and counted as defective.
【００２４】また、各電池については放電特性の確認と
して２０℃において３０ｍＡ連続放電を実施、電池容量
を確認した結果についても表１に示す。振動試験におい
て本実施例１及び実施例２は各試験後において不良は発
生しなかった。それに対し、比較例１では製造直後、及
び貯蔵後においても不良が発生した。比較例２について
は、製造直後についての不良発生はなかったものの、高
温貯蔵後における試験では不良の発生が認められ、貯蔵
による導電性接着剤の劣化により、接着が不十分とな
り、内部ショートに至ったものと考える。Table 1 shows the results of a continuous discharge of 30 mA at 20 ° C. as a check of the discharge characteristics of each battery, and a check of the battery capacity. In the vibration test, in Examples 1 and 2, no failure occurred after each test. On the other hand, in Comparative Example 1, defects occurred immediately after production and also after storage. In Comparative Example 2, although no defect occurred immediately after the production, a defect occurred in a test after high-temperature storage, and the adhesion became insufficient due to deterioration of the conductive adhesive due to storage, resulting in an internal short circuit. I think it was.
【００２５】[0025]
【表１】 [Table 1]
【００２６】以上に示されるように、前記絶縁ガスケッ
トの少なくとも一部分が、前記電極群を保持するように
突起を設けた扁平形非水電解質二次電池では、常温や高
温貯蔵後においても、輸送などの振動が生じた場合でも
電池内部において内部ショートすることなく、信頼性の
優れた電池を供給することができる。As described above, in a flat non-aqueous electrolyte secondary battery in which at least a part of the insulating gasket is provided with a projection to hold the electrode group, even after storage at room temperature or high temperature, the transport gasket can be used. Even when the vibration occurs, a highly reliable battery can be supplied without causing an internal short circuit inside the battery.
【００２７】本実施例において、絶縁ガスケット６の電
極群を保持する目的である突起部の高さａに対し、電極
高さをｂとした時に、絶縁ガスケットの少なくとも一部
がａ＜ｂになるように欠足部６ｄを設けた理由は、絶縁
ガスケット６の電極群を保持する目的である突起部の高
さａと電極群の高さｂを同じにした場合、絶縁ガスケッ
トと電極群の隙間が全くなくなり、表１の結果からもわ
かるように放電に必要な電解液スペースがなくなること
により、放電での十分な利用率が望めないからである。In this embodiment, at least a part of the insulating gasket satisfies a <b when the height of the electrode is b with respect to the height a of the protruding portion for holding the electrode group of the insulating gasket 6. The reason why the missing foot portion 6d is provided is that, when the height a of the protruding portion and the height b of the electrode group, which are intended to hold the electrode group of the insulating gasket 6, are the same, the gap between the insulating gasket and the electrode group. This is because, as can be seen from the results in Table 1, there is no electrolytic solution space required for discharge, so that a sufficient utilization rate in discharge cannot be expected.
【００２８】なお、本発明の実施例は、非水電解質に非
水溶媒を用いた扁平形非水電解質二次電池を用いて説明
したが、非水電解質にポリマー電解質を用いたポリマー
二次電池や固体電解質を用いた固体電解質二次電池につ
いても、同様の効果が得られる。さらに樹脂製セパレー
タの代りにポリマー薄膜や固体電解質膜を用いることも
可能である。Although the embodiment of the present invention has been described using a flat non-aqueous electrolyte secondary battery using a non-aqueous solvent as a non-aqueous electrolyte, a polymer secondary battery using a polymer electrolyte as a non-aqueous electrolyte has been described. The same effect can be obtained for a solid electrolyte secondary battery using a solid electrolyte. Further, it is also possible to use a polymer thin film or a solid electrolyte membrane instead of the resin separator.
【００２９】[0029]
【発明の効果】以上説明したように、本発明の扁平形非
水電解質二次電池は、輸送などの振動により電池内部で
短絡の発生することのない信頼性に優れた電池を供給す
ることができ、また、絶縁ガスケットの電極群を保持す
る目的である突起部の高さａに対し、電極高さｂとした
時に、前記絶縁ガスケットの一部がａ＜ｂになるように
欠足部を設けたことにより十分な放電性能を確保した電
池を供給することができる。As described above, the flat nonaqueous electrolyte secondary battery of the present invention can provide a highly reliable battery that does not cause a short circuit inside the battery due to vibrations during transportation or the like. In addition, when the height of the electrode is set to b with respect to the height a of the protruding portion intended to hold the electrode group of the insulating gasket, the missing foot portion is formed so that a part of the insulating gasket satisfies a <b. By providing the battery, a battery having sufficient discharge performance can be supplied.
【図１】本発明の実施例１の電池の構成図であり、同図
（ａ）は同図（ｂ）のＸ−Ｘの断面図、同図（ｂ）は同
図（ａ）の上面透視図。FIGS. 1A and 1B are configuration diagrams of a battery according to a first embodiment of the present invention. FIG. 1A is a cross-sectional view taken along line XX of FIG. 1B, and FIG. 1B is a top view of FIG. Perspective view.
【図２】本発明の実施例２の電池の構成図であり、同図
（ａ）は同図（ｂ）のＸ−Ｘ断面図、同図（ｂ）は同図
（ａ）の上面透視図。FIGS. 2A and 2B are configuration diagrams of a battery according to Example 2 of the present invention. FIG. 2A is a cross-sectional view taken along line XX of FIG. 2B, and FIG. 2B is a top perspective view of FIG. FIG.
【図３】同図（ａ）は図２（ｂ）のＢ方向からの透視
図、同図（ｂ）図２（ｂ）のＸ１−Ｘ１の断面図。[3] FIG. (A) is a perspective view from B direction of FIG. 2 (b), FIG. (B) cross-sectional view of the X 1 -X 1 in Fig. 2 (b).
【図４】比較例１の扁平形非水電解質時に電池の構成図
であり、同図（ａ）は同図（ｂ）のＸ−Ｘの断面図、同
図（ｂ）は同図（ａ）の上面透視図。4A and 4B are configuration diagrams of a battery when a flat nonaqueous electrolyte of Comparative Example 1 is used. FIG. 4A is a cross-sectional view taken along line XX of FIG. 4B, and FIG. FIG.
１…正極ケース、２…正極板、３…セパレータ、４…負
極板、５…負極金属ケース、６…絶縁ガスケット、６ｃ
…絶縁ガスケット突起部、６ｄ…絶縁ガスケット欠足
部、ａ…絶縁ガスケット高さ、ｂ…電極高さ。DESCRIPTION OF SYMBOLS 1 ... Positive electrode case, 2 ... Positive electrode plate, 3 ... Separator, 4 ... Negative electrode plate, 5 ... Negative electrode metal case, 6 ... Insulating gasket, 6c
... Insulating gasket protrusion, 6d ... Insulating gasket missing foot, a ... Insulating gasket height, b ... Electrode height.
フロントページの続き (72)発明者 鈴木 正美 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 AA09 CC06 DD15 FF03 GG02 HH02 JJ04 KK01 5H029 AJ01 AJ12 AJ14 AK03 AL06 AL07 AM03 AM05 AM07 AM16 BJ03 BJ12 BJ14 DJ03 DJ12 HJ04 Continued on the front page (72) Inventor Masami Suzuki 3-4-10 Minamishinagawa, Shinagawa-ku, Tokyo Toshiba Battery Corporation F-term (reference) 5H011 AA03 AA09 CC06 DD15 FF03 GG02 HH02 JJ04 KK01 5H029 AJ01 AJ12 AJ14 AK03 AL06 AL07 AM03 AM05 AM07 AM16 BJ03 BJ12 BJ14 DJ03 DJ12 HJ04
Claims (2)
と、正極端子を兼ねる金属製の正極ケースが、絶縁ガス
ケットを介し嵌合され、さらに該絶縁ガスケットを前記
正極ケースが径方向及び高さ方向に圧縮するかしめ加工
によりかしめられた封口構造を有し、その内部にリチウ
ム含有酸化物の正極、及び炭素質材料の負極をセパレー
タを介して、帯状に捲回又は多層積層した電極群を非水
電解質とともに内包した扁平形非水電解質二次電池にお
いて、前記ガスケットの少なくとも一部が、前記電極群
を保持するように突起を設けたことを特徴とする扁平形
非水電解質二次電池。1. A metal negative electrode case also functioning as a negative electrode terminal and a metal positive electrode case also functioning as a positive electrode terminal are fitted via an insulating gasket. It has a sealing structure that is swaged by caulking to compress, into which a positive electrode of a lithium-containing oxide and a negative electrode of a carbonaceous material are separated by a separator, and a group of electrodes wound in a belt shape or multi-layered is non-aqueous. A flat non-aqueous electrolyte secondary battery including a flat non-aqueous electrolyte secondary battery including an electrolyte, wherein at least a part of the gasket is provided with a projection to hold the electrode group.
池において、前記電極群を保持する前記絶縁ガスケット
の突起の高さをａ、前記電極群の高さをｂとするとき、
前記絶縁ガスケットの少なくとも一部がａ＜ｂの関係に
あることを特徴とする扁平形非水電解質二次電池。2. The flat nonaqueous electrolyte secondary battery according to claim 1, wherein a height of a projection of the insulating gasket holding the electrode group is a, and a height of the electrode group is b.
A flat nonaqueous electrolyte secondary battery, wherein at least a part of the insulating gasket has a relationship of a <b.
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|---|---|---|---|
| JP2001097753A JP2002298803A (en) | 2001-03-30 | 2001-03-30 | Flat nonaqueous electrolyte secondary battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001097753A JP2002298803A (en) | 2001-03-30 | 2001-03-30 | Flat nonaqueous electrolyte secondary battery |
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|---|---|
| JP2002298803A true JP2002298803A (en) | 2002-10-11 |
Family
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| US10366844B2 (en) | 2016-01-15 | 2019-07-30 | Seiko Instruments Inc. | Electrochemical cell |
| US10622592B2 (en) | 2016-11-22 | 2020-04-14 | Seiko Instruments Inc. | Electrochemical cell and manufacturing method of the electrochemical cell |
| US20200185755A1 (en) | 2009-02-09 | 2020-06-11 | Varta Microbattery Gmbh | Button cells and method of producing same |
| US10804506B2 (en) | 2009-06-18 | 2020-10-13 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US10916798B2 (en) | 2016-01-12 | 2021-02-09 | Seiko Instruments Inc. | Electrochemical cell and manufacturing method of electrochemical cell |
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| US11258092B2 (en) | 2009-02-09 | 2022-02-22 | Varta Microbattery Gmbh | Button cells and method of producing same |
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| US11024904B2 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11362384B2 (en) | 2009-06-18 | 2022-06-14 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024907B1 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024905B2 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11158896B2 (en) | 2009-06-18 | 2021-10-26 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11217844B2 (en) | 2009-06-18 | 2022-01-04 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US10971776B2 (en) | 2009-06-18 | 2021-04-06 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11791512B2 (en) | 2009-06-18 | 2023-10-17 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US10804506B2 (en) | 2009-06-18 | 2020-10-13 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11362385B2 (en) | 2009-06-18 | 2022-06-14 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
| US11024906B2 (en) | 2009-06-18 | 2021-06-01 | Varta Microbattery Gmbh | Button cell having winding electrode and method for the production thereof |
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