JPH1050272A - Nonaqueous electrolyte secondary battery - Google Patents
Nonaqueous electrolyte secondary batteryInfo
- Publication number
- JPH1050272A JPH1050272A JP9119422A JP11942297A JPH1050272A JP H1050272 A JPH1050272 A JP H1050272A JP 9119422 A JP9119422 A JP 9119422A JP 11942297 A JP11942297 A JP 11942297A JP H1050272 A JPH1050272 A JP H1050272A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- electrode body
- positive electrode
- present
- spiral electrode
- 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.)
- Granted
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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、渦巻電極体を備えた高
出力型の非水電解液二次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 high-output nonaqueous electrolyte secondary battery having a spiral electrode body.
【０００２】[0002]
【従来の技術】従来、非水電解液電池は、高電圧で優れ
た特性を有し、この特性が生かされて多用途に使用され
ている。2. Description of the Related Art Conventionally, non-aqueous electrolyte batteries have excellent characteristics at high voltages, and these characteristics have been utilized for various purposes.
【０００３】ところで、この種電池の正極缶材料として
は、ステンレスが一般的に用いられているが、特に３．
５Ｖ以上の高電圧電池は、長期間保存すると、正極缶の
ー部に腐食孔があいて液漏れする問題点等がある。この
正極缶が腐食するのは、正極缶材料に用いられているス
テンレス中の鉄成分が鉄イオンとなって、溶解するから
であり、この溶解反応が続くと、最終的には正極缶に腐
食孔があいて電解液が漏出することになる。As a material for the positive electrode can of this type of battery, stainless steel is generally used.
A high voltage battery of 5 V or more has a problem that, when stored for a long period of time, a corrosive hole is formed in a portion of a positive electrode can and a liquid leaks. The reason why the positive electrode can corrodes is that iron components in the stainless steel used for the positive electrode can material become iron ions and dissolve, and if this dissolution reaction continues, the positive electrode can eventually corrodes. There will be holes and electrolyte will leak out.
【０００４】そこで、正極缶の腐食を防止するために、
正極缶にアルミニウムを使用したリチウム一次電池が開
発されている。この場合、アルミニウムはステンレスに
比較して溶解電圧が高いので、正極缶の腐食を防止する
ことができる。Therefore, in order to prevent corrosion of the positive electrode can,
Lithium primary batteries using aluminum for the positive electrode can have been developed. In this case, since the melting voltage of aluminum is higher than that of stainless steel, corrosion of the positive electrode can can be prevented.
【０００５】しかしながら、二次電池の高出力を得るた
めに電極面積を大きくした渦巻電極体を用いた非水電解
液電池において、アルミニウム正極缶と渦巻電極体との
接触により電流を取り出す場合、正極缶と渦巻電極体最
外周の正極活物質との接触であるために、電気的接続が
悪く、内部抵抗が増加して、電池特性に悪影響を生じる
という問題点がある。そのため、正極より、別途タブリ
ードを取り出し、これを正極缶と接続するといった複雑
な構造が必要であった。However, in a non-aqueous electrolyte battery using a spiral electrode body having a large electrode area in order to obtain a high output of a secondary battery, when a current is taken out by contact between the aluminum positive electrode can and the spiral electrode body, a positive electrode is required. Since the can is in contact with the positive electrode active material on the outermost periphery of the spiral electrode body, there is a problem in that the electrical connection is poor, the internal resistance increases, and the battery characteristics are adversely affected. Therefore, a complicated structure was required in which a tab lead was separately taken out from the positive electrode and connected to the positive electrode can.
【０００６】[0006]
【発明が解決しようとする課題】本願発明の目的は、上
記のような問題点を解決し、高耐食性、軽量、簡単な電
気接続構造であって、放電容量やサイクル特性の優れた
非水電解液電池を提供するものである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a non-aqueous electrolyte having a high corrosion resistance, a light weight, a simple electric connection structure, and excellent discharge capacity and cycle characteristics. A liquid battery is provided.
【０００７】[0007]
【課題を解決するための手段】本願発明の非水電解液二
次電池は、電池電圧を３．５Ｖ以上５．０Ｖ以下とし、
正極と、負極と、セパレータとからなる電極体と、非水
電解液と、外装缶とを備える。さらに、本発明の非水電
解液二次電池は、外装缶材料をアルミニウムとする。The nonaqueous electrolyte secondary battery of the present invention has a battery voltage of 3.5 V or more and 5.0 V or less,
An electrode body including a positive electrode, a negative electrode, and a separator, a nonaqueous electrolyte, and an outer can are provided. Further, in the nonaqueous electrolyte secondary battery of the present invention, the outer can material is aluminum.
【０００８】本発明の請求項２の非水電解液二次電池
は、正極の活物質をリチウム含有化合物とし、負極をリ
チウムイオンを吸蔵、放出できる炭素質材料とするリチ
ウムイオン二次電池である。A nonaqueous electrolyte secondary battery according to a second aspect of the present invention is a lithium ion secondary battery in which the active material of the positive electrode is a lithium-containing compound and the negative electrode is a carbonaceous material capable of inserting and extracting lithium ions. .
【０００９】[0009]
【作用】外装缶に使用される材料としては、白金、チタ
ン、アルミニウム等が考えられるが、耐食性の面や工業
的スケール（資源及び材料コスト等）等を考慮すると、
使用される材料が規制され、安価で導電性も良好なアル
ミニウムが最適であることが判る。[Function] Platinum, titanium, aluminum, etc. can be considered as the material used for the outer can. However, considering corrosion resistance and industrial scale (resources and material costs, etc.),
It is understood that the material to be used is restricted, and aluminum that is inexpensive and has good conductivity is optimal.
【００１０】そこで、本願発明は、充電状態の電圧が
３．５Ｖ以上５．０Ｖ以下の非水電解液二次電池におい
て、正極缶などの腐食を防止するために、正極缶材料を
アルミニウムとするものであり、高耐食性が得られる。In view of the above, according to the present invention, in a non-aqueous electrolyte secondary battery having a charged state voltage of 3.5 V or more and 5.0 V or less, the positive electrode can is made of aluminum in order to prevent corrosion of the positive electrode can and the like. And high corrosion resistance is obtained.
【００１１】また、比重の小さいアルミニウムを外装缶
として用いることにより、軽量化において、優れた効果
を得ることができる。例えば、正極缶として、ステンレ
スとアルミニウムを用いた場合の重量エネルギー密度の
一比較例を表１に示す。Further, by using aluminum having a small specific gravity as the outer can, an excellent effect in weight reduction can be obtained. For example, Table 1 shows a comparative example of the weight energy density when stainless steel and aluminum are used as the positive electrode can.
【００１２】[0012]
【表１】 [Table 1]
【００１３】表１より、ステンレスと比較してアルミニ
ウムでは、重量エネルギー密度は約５０％増となる。As shown in Table 1, the weight energy density of aluminum is increased by about 50% as compared with stainless steel.
【００１４】さらにまた、非水電解液電池等を使用機器
等に組み込む時は限られた空間しかなく、その空間をよ
り有効に使用するためには、電池の外観は円筒形ではな
く角形で、特に矩形または長円形にする方が非常に有効
である。Furthermore, when a non-aqueous electrolyte battery or the like is incorporated into a device to be used, there is only a limited space. In order to use that space more effectively, the appearance of the battery is not a cylinder but a prismatic shape. In particular, it is very effective to make a rectangle or an oval.
【００１５】しかしながら、ここで矩形の外装缶に渦巻
電極体を挿入するには、渦巻電極体は真円ではなく長円
形状でなくてはならない。このとき、長円形状の渦巻電
極体は、外装缶に挿入した後に真円に近い方へ戻ろうと
するために（図６）、外装缶の短径及び長径に復元力が
作用する。この復元力を利用して、外装缶と渦巻電極体
との接触圧を高め、良好な電気的接続を維持することが
できる。However, in order to insert the spiral electrode body into the rectangular outer can, the spiral electrode body must be not a perfect circle but an oval shape. At this time, a restoring force acts on the short diameter and the long diameter of the outer can because the elliptical spiral electrode body attempts to return to a direction closer to a perfect circle after being inserted into the outer can (FIG. 6). By utilizing this restoring force, the contact pressure between the outer can and the spiral electrode body can be increased, and good electrical connection can be maintained.
【００１６】ここで、長円形状の渦巻電極の短径ａ及び
長径ｂと外装缶開口部内周の短径Ａ及び長径Ｂとが、
（ａ／Ａ）≧（ｂ／Ｂ）且つ、（Ａ−ａ）≦（Ｂ−ｂ）
のような関係にあれば、主として短径方向で渦巻電極間
での緊迫度及び外装缶と最外周芯体との接触集電効果の
両方が最適に確保することができる。Here, the minor axis a and major axis b of the elliptical spiral electrode and the minor axis A and major axis B of the inner circumference of the outer can opening are defined by:
(A / A) ≧ (b / B) and (A−a) ≦ (B−b)
With such a relationship, both the degree of tightness between the spiral electrodes and the contact current collection effect between the outer can and the outermost core can be optimally secured mainly in the minor diameter direction.
【００１７】この理由は、長円形状渦巻電極体には真円
に近い方向への復元力が働き、長円形状渦巻電極体の長
径方向は縮む方向へ、短径方向は伸びる方向へ復元力が
作用するために良好な緊迫及び接触が得られることと、
短径方向のほうが渦巻電極体と外装缶とがフラットに近
い部分で接触する面積が大きいことによるものであるThe reason for this is that a restoring force acts on the elliptical spiral electrode body in a direction close to a perfect circle, and the restoring force acts on the elliptical spiral electrode body in a direction of contraction in the major axis direction and in a direction of extension in the minor axis direction. That good tension and contact are obtained for the action of
This is due to the fact that the area in which the spiral electrode body and the outer can come into contact with each other in the near-flat part is larger in the minor axis direction.
【００１８】[0018]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００１９】図１−ａは本発明の非水電解液二次電池に
内蔵される渦巻電極体の部分断面図、図１−ｂは渦巻電
極体の斜視図である。FIG. 1A is a partial sectional view of a spiral electrode body incorporated in the nonaqueous electrolyte secondary battery of the present invention, and FIG. 1B is a perspective view of the spiral electrode body.
【００２０】［正極の作製］活物質としてのコバルト酸
リチウムと、導電剤としてのアセチレンブラック及び結
着剤としてのフッ素樹脂ディスパージョンをそれぞれ重
量比で９０：６：４の比率で混練して正極合剤１−２を
得た。次いで、この正極合剤を芯体１−１としてのアル
ミニウム製のラス板に圧延して、これを２５０℃で２時
間真空熱処理して正極１を作製した。尚、正極の最外周
端部は正極合剤１−２を脱落させて、少なくとも芯体１
−１を一部分露出させている。[Preparation of Positive Electrode] Lithium cobaltate as an active material, acetylene black as a conductive agent and a fluororesin dispersion as a binder were kneaded at a weight ratio of 90: 6: 4, respectively, and the positive electrode was kneaded. The mixture 1-2 was obtained. Next, this positive electrode mixture was rolled into an aluminum lath plate as a core body 1-1, and this was subjected to vacuum heat treatment at 250 ° C. for 2 hours to produce a positive electrode 1. In addition, the outermost end of the positive electrode drops the positive electrode mixture 1-2, and at least the core 1
-1 is partially exposed.
【００２１】［負極の作製］４００メッシュパスのグラ
ファイト粉末と、結着剤としてのフッ素樹脂ディスパー
ジョンとをそれぞれ重量比で９５：５の比率で混合し
て、負極合剤３−２を得た。次いで、この負極合剤を銅
製の芯体３−１に圧延して、これを２５０℃で２時間真
空下で熱処理して負極３を作製した。[Preparation of Negative Electrode] A graphite powder of 400 mesh pass and a fluororesin dispersion as a binder were mixed at a weight ratio of 95: 5, respectively, to obtain a negative electrode mixture 3-2. . Next, the negative electrode mixture was rolled into a copper core 3-1 and heat-treated at 250 ° C. for 2 hours under vacuum to prepare a negative electrode 3.
【００２２】［渦巻電極体の作製］上記正極１と、負極
３とをポリエチレン製微孔性薄膜のセパレータ２を介し
て巻回し、渦巻電極体４を作製した。[Preparation of Spiral Electrode Body] The positive electrode 1 and the negative electrode 3 were wound through a polyethylene microporous thin film separator 2 to prepare a spiral electrode body 4.
【００２３】図２は、非水電解液電池の分解構成斜視図
である。FIG. 2 is an exploded perspective view of the nonaqueous electrolyte battery.
【００２４】上記渦巻電極体４をアルミニウム製有底矩
形外装缶５中に収納する。次いで、溶媒として、エチレ
ンカーボネートと、ジメチルカーボネートとを体積比で
１：１の比率で混合して、溶質として、ＬｉＰＦ6を１
モル／リットルを混合溶媒に溶かした非水電解液を注液
し、外装缶開口部に安全弁装置を設けた封口体（図示し
ない）を溶接し、密閉して容積約１０ｃｃの非水電解液
電池を作製した。The spiral electrode body 4 is housed in a bottomed rectangular outer can 5 made of aluminum. Next, ethylene carbonate and dimethyl carbonate were mixed at a volume ratio of 1: 1 as solvents, and LiPF 6 was added as a solute at 1: 1.
A non-aqueous electrolyte solution in which mol / liter is dissolved in a mixed solvent is injected, and a sealing member (not shown) provided with a safety valve device at the opening of the outer can is welded and sealed, and a non-aqueous electrolyte battery having a capacity of about 10 cc is sealed. Was prepared.
【００２５】次に、外装缶内周の短径をＡ、長径をＢ、
渦巻電極体の短径をａ、長径をｂとして、（ａ／Ａ）＞
（ｂ／Ｂ）且つ、（Ａ−ａ）＜（Ｂ−ｂ）の関係がある
ときの電池を本発明電池Ａ１として図３に示す。図３−
ａは渦巻電極体の断面図、図３−ｂは外装缶の断面図、
図３−ｃは本発明電池Ａ１の断面図である。Next, the minor axis of the inner circumference of the outer can is A, the major axis is B,
Assuming that the minor axis of the spiral electrode body is a and the major axis is b, (a / A)>
The battery when (b / B) and (A-a) <(B-b) are shown in FIG. 3 as the battery A1 of the present invention. Figure 3-
a is a sectional view of a spiral electrode body, FIG. 3-b is a sectional view of an outer can,
FIG. 3C is a cross-sectional view of the battery A1 of the present invention.
【００２６】このような上記の関係にあるときは、渦巻
電極体は図６に示すような復元力が渦巻電極体の短径方
向にかかるために、外装缶短径方向において、外装缶短
径方向と渦巻電極体短径方向との良好な緊迫度が得られ
る。In such a relationship, the spiral electrode body exerts a restoring force as shown in FIG. 6 in the minor axis direction of the spiral electrode body. A good degree of tightness between the direction and the short diameter direction of the spiral electrode body is obtained.
【００２７】また、（ａ／Ａ）＝（ｂ／Ｂ）且つ、（Ａ
−ａ）＝（Ｂ−ｂ）のような関係のときの電池を、本発
明の実施例の電池Ａ２とし、図４に示す。図４−ａは渦
巻電極体の断面図、図４−ｂは外装缶の断面図、図４−
ｃは本発明の実施例の電池Ａ２の断面図である。(A / A) = (b / B) and (A / A) = (b / B)
FIG. 4 shows a battery in the case of -a) = (Bb) as the battery A2 of the embodiment of the present invention. 4A is a cross-sectional view of a spiral electrode body, FIG. 4-B is a cross-sectional view of an outer can, FIG.
c is a cross-sectional view of the battery A2 according to the example of the present invention.
【００２８】本発明の実施例の電池Ａ２は、外装缶内周
の短径と渦巻電極体の短径、外装缶内周の長径と渦巻電
極体の長径とがそれぞれ等しいときである。この場合
は、外装缶内周の短径及び長径に渦巻電極体の短径及び
長径がそれぞれに接している状態になる。In the battery A2 according to the embodiment of the present invention, the short diameter of the inner circumference of the outer can and the short diameter of the spiral electrode body are the same, and the long diameter of the inner circumference of the outer can and the long diameter of the spiral electrode body are respectively equal. In this case, the short diameter and the long diameter of the spiral electrode body are in contact with the short diameter and the long diameter of the inner circumference of the outer can.
【００２９】次に、（ａ／Ａ）＜（ｂ／Ｂ）且つ、（Ａ
−ａ）＞（Ｂ−ｂ）のような関係のときの状態の電池を
比較電池Ｘとして図５に示す。図５−ａは渦巻電極体の
断面図、図５−ｂは外装缶の断面図、図５−ｃは比較電
池Ｘの断面図である。Next, (a / A) <(b / B) and (A / A) <(b / B)
FIG. 5 shows a battery in a state where the relationship of −a)> (Bb) is established as a comparative battery X. 5A is a sectional view of the spiral electrode body, FIG. 5B is a sectional view of the outer can, and FIG. 5C is a sectional view of the comparative battery X.
【００３０】この場合、渦巻電極体の短径方向の寸法が
外装缶内周の短径方向の寸法よりも小さいために、短径
方向では接触しない状態になる。これでは、長径方向で
しか緊迫度が得られないために電池特性に悪影響を及ぼ
す。In this case, since the dimension in the minor axis direction of the spiral electrode body is smaller than the dimension in the minor axis direction of the inner circumference of the outer can, no contact occurs in the minor axis direction. In this case, the degree of tension can be obtained only in the long diameter direction, which adversely affects the battery characteristics.
【００３１】［実験１］次に、本発明の実施例の電池Ａ
１及びＡ２と、比較電池Ｘのそれぞれ１０個の初期内部
抵抗とショート電流とを測定し、それらの平均値を表２
に示した。[Experiment 1] Next, the battery A of the embodiment of the present invention was used.
1 and A2 and 10 initial internal resistances and short-circuit currents of the comparative battery X were measured.
It was shown to.
【００３２】[0032]
【表２】 [Table 2]
【００３３】このように本発明の実施例の電池Ａ１及び
Ａ２では、渦巻電極体の緊迫度が高くなることで、外装
缶と渦巻電極体との接触強度も増加し、さらに、電極間
距離も小さくなり、初期内部抵抗も小さくなり電池特性
が向上する。As described above, in the batteries A1 and A2 of the embodiment of the present invention, the contact strength between the outer can and the spiral electrode body is increased by increasing the tension of the spiral electrode body, and the distance between the electrodes is also reduced. As a result, the initial internal resistance decreases, and the battery characteristics are improved.
【００３４】［実験２］図７及び図８に、本発明の実施
例の電池Ａ１及びＡ２と比較電池Ｘとの電池特性の比較
を示す。[Experiment 2] FIGS. 7 and 8 show a comparison of battery characteristics between the batteries A1 and A2 of the embodiment of the present invention and the comparative battery X.
【００３５】図７は、本発明の実施例の電池Ａ１、Ａ２
及び比較電池Ｘの放電特性を示した図であり、測定条件
は、２００ｍＡの電流で電池電圧が４．２Ｖに達するま
で充電した後、２００ｍＡの電流で電池電圧が２．７Ｖ
に達するまで放電した曲線を示したものである。FIG. 7 shows the batteries A1 and A2 according to the embodiment of the present invention.
FIG. 5 is a diagram showing the discharge characteristics of a comparative battery X. The measurement conditions were as follows: the battery was charged at a current of 200 mA until the battery voltage reached 4.2 V, and the battery voltage was 2.7 V at a current of 200 mA.
FIG. 4 shows a curve discharged until the temperature reaches the threshold value.
【００３６】図７より、本発明の実施例の電池Ａ１及び
Ａ２の方が、比較電池Ｘよりも放電容量が大きいことが
判る。FIG. 7 shows that the batteries A1 and A2 of the embodiment of the present invention have a larger discharge capacity than the comparative battery X.
【００３７】また、図８は、サイクル特性を示した図で
あり、測定条件は２００ｍＡの電流で電池電圧が４．２
Ｖに達するまで充電した後、２００ｍＡの電流で電池電
圧が２．７Ｖに達するまで放電するというサイクルを繰
り返すものである。FIG. 8 is a graph showing the cycle characteristics. The measurement conditions were as follows: a current of 200 mA and a battery voltage of 4.2.
After the battery is charged until the battery voltage reaches 2.7 V, the battery is discharged at a current of 200 mA until the battery voltage reaches 2.7 V.
【００３８】図８より、本発明の実施例の電池Ａ１及び
Ａ２は、比較電池Ｘと比べて、サイクル特性が向上して
いることが判る。FIG. 8 shows that the batteries A1 and A2 of the example of the present invention have improved cycle characteristics as compared with the comparative battery X.
【００３９】[0039]
【発明の効果】本発明の非水電解液二次電池は、正極
と、負極とセパレータとからなる電極体と、非水電解液
と、外装缶とから構成される電池電圧が３．５Ｖ以上
５．０Ｖ以下の非水電解液電池において、外装缶材料を
アルミニウムとするので、充電状態における高電圧に対
する耐食性が向上し、かつ、電池自身の軽量化を計るこ
とができる。The non-aqueous electrolyte secondary battery of the present invention has a battery voltage of 3.5 V or more composed of a positive electrode, an electrode body including a negative electrode and a separator, a non-aqueous electrolyte, and an outer can. In a non-aqueous electrolyte battery of 5.0 V or less, since the outer can material is made of aluminum, the corrosion resistance against a high voltage in a charged state is improved, and the weight of the battery itself can be reduced.
【図１】 本発明電池の渦巻電極体の構成図である。FIG. 1 is a configuration diagram of a spiral electrode body of a battery of the present invention.
【図２】 本発明電池の分解構成図である。FIG. 2 is an exploded view of the battery of the present invention.
【図３】 ａ 本発明の実施例の電池Ａ１の渦巻電極体
断面図である。 ｂ 外装缶の断面図である。 ｃ 本発明電池Ａ１の断面図である。FIG. 3A is a cross-sectional view of a spiral electrode body of a battery A1 according to an example of the present invention. b It is sectional drawing of an exterior can. c is a cross-sectional view of the battery A1 of the present invention.
【図４】 ａ 本発明電池Ａ２の渦巻電極体断面図であ
る。 ｂ 外装缶の断面図である。 ｃ 本発明電池Ａ２の断面図である。FIG. 4a is a cross-sectional view of a spiral electrode body of the battery A2 of the present invention. b It is sectional drawing of an exterior can. c It is sectional drawing of this invention battery A2.
【図５】 ａ 比較電池Ｘの渦巻電極体断面図である。 ｂ 外装缶の断面図である。 ｃ 比較電池Ｘの断面図である。5A is a cross-sectional view of a spiral electrode body of a comparative battery X. FIG. b It is sectional drawing of an exterior can. c is a sectional view of a comparative battery X.
【図６】 渦巻電極体の復元力の説明図である。FIG. 6 is an explanatory diagram of a restoring force of a spiral electrode body.
【図７】 放電特性を示す図である。FIG. 7 is a diagram showing discharge characteristics.
【図８】 サイクル特性を示す図である。FIG. 8 is a diagram showing cycle characteristics.
１・・・・・・正極 １−１・・・・正極芯体 １−２・・・・正極活物質 ２・・・・・・セパレータ ３・・・・・・負極 ３−１・・・・負極芯体 ３−２・・・・負極活物質 ４・・・・・・渦巻電極体 ５・・・・・・アルミニウム外装缶 Ａ１・・・・・本発明電池 Ａ２・・・・・本発明電池 Ｘ・・・・・・比較電池 DESCRIPTION OF SYMBOLS 1 ... Positive electrode 1-1 ... Positive electrode core 1-2 ... Positive electrode active material 2 ... Separator 3 ... Negative electrode 3-1 ...・ Negative electrode core 3-2 ・ ・ ・ ・ Negative electrode active material 4 ・ ・ ・ ・ ・ ・ Swirl electrode body 5 ・ ・ ・ ・ ・ ・ Aluminum outer can A1 ・ ・ ・ ・ ・ ・ Battery of the present invention A2 ・ ・ ・ ・ ・ ・ Book Inventive battery X: Comparative battery
─────────────────────────────────────────────────────
────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成９年５月９日[Submission date] May 9, 1997
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】全文[Correction target item name] Full text
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【書類名】 明細書[Document Name] Statement
【発明の名称】 非水電解液二次電池[Title of the Invention] Non-aqueous electrolyte secondary battery
【特許請求の範囲】[Claims]
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【産業上の利用分野】本発明は、渦巻電極体を備えた高
出力型の非水電解液二次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 high-output nonaqueous electrolyte secondary battery having a spiral electrode body.
【０００２】[0002]
【従来の技術】従来、非水電解液電池は、高電圧で優れ
た特性を有し、この特性が生かされて多用途に使用され
ている。2. Description of the Related Art Conventionally, non-aqueous electrolyte batteries have excellent characteristics at high voltages, and these characteristics have been utilized for various purposes.
【０００３】ところで、この種電池の外装缶材料とし
て、ステンレスが一般的に用いられる。ただ、ステンレ
ス製の外装缶を正極とする非水電解液二次電池は、電池
電圧が３．５Ｖ以上の高電圧になると、長期間保存した
ときに、外装缶に腐食孔があいて液漏れする問題点等が
ある。外装缶が腐食するのは、正極外装缶に用いられて
いるステンレス中の鉄成分が鉄イオンとなって、溶解す
るからである。外装缶の溶解反応が続くと、最終的には
正極として使用される外装缶に腐食孔があいて電解液が
漏出することになる。By the way, as an outer can material for this type of battery,
Te, Ru stainless steel generally used. Just stainless
Non-aqueous electrolyte secondary batteries with a stainless steel outer can as the positive electrode
When the voltage became higher than 3.5 V , it was stored for a long time .
Occasionally, there is a problem of corrosion leaks due to corrosion holes in the outer can.
is there. The outer can corrodes because the iron component in the stainless steel used for the positive electrode outer can becomes iron ions and dissolves . When the dissolution reaction of the outer can continues, the outer can used as a positive electrode eventually has a corrosive hole and the electrolyte leaks.
【０００４】そこで、正極に使用される外装缶の腐食を
防止するために、外装缶をアルミニウム製とするリチウ
ム一次電池が開発されている。溶解電圧の高いアルミニ
ウムによって、外装缶の腐食を防止するためである。た
だ、リチウム一次電池は、正極材料によって、電池電圧
が多少は変動するが、充電して繰り返し使用される二次
電池よりも電池電圧が低い。たとえば、時計や電卓に使
用される電池であって正極材料に（ＣＦx）nやＭｎＯ2
を使用するリチウム一次電池の動作電圧は、２．６〜
２．８Ｖ、種々の電子機器に使用される電池で正極材料
にＣｕＯ、Ｂｉ2Ｐｂ2Ｏ5、ＦｅＳ2を使用するリチウム
一次電池の動作電圧は、１．５〜１．６Ｖ、動作電圧の
高い軍事用に使用される正極材料にＶ2Ｏ5、Ａｇ2Ｃｒ
Ｏ4、ＳＯ 2、ＣｕＳを使用するリチウム一次電池の動作
電圧は１．８〜３．５Ｖである。 [0004]Outer can used for positive electrodeThe corrosion of
To preventOuter canaluminumLichu to be made
Primary batteries have been developed. Aluminum with high melting voltage
This is for preventing corrosion of the outer can by the um. Was
However, the lithium primary battery depends on the positive electrode material,
Although it fluctuates somewhat, secondary charging and repeated use
Battery voltage is lower than battery. For example, use it for watches and calculators.
Battery used for the positive electrode material (CF x ) n or MnO 2
The operating voltage of a lithium primary battery using
2.8V, positive electrode material for batteries used in various electronic devices
Using CuO, Bi 2 Pb 2 O 5 , FeS 2 for lithium
The operating voltage of the primary battery is 1.5 to 1.6 V,
V 2 O 5 , Ag 2 Cr are used as cathode materials used for high military applications.
OFour, SO TwoOf Lithium Primary Battery Using Cu and CuS
The voltage is between 1.8 and 3.5V.
【０００５】リチウム一次電池は、リチウムイオン二次
電池に比較して電池電圧が低いので、外装缶をステンレ
スからアルミニウムに変更して、正極外装缶の溶解によ
る腐食を防止できると考えられている。ただ、リチウム
イオン二次電池は、リチウム一次電池よりもさらに電池
電圧が高く、とくに、二次電池は充電するときに、電池
電圧が４．１〜４．２Ｖと相当に高くなるので、外装缶
を正極として使用した場合腐食を防止することができな
いと考えられていた。 [0005] A lithium primary battery is a lithium ion secondary battery.
Since the battery voltage is lower than the battery,
From aluminum to aluminum
It is believed that corrosion can be prevented. Just lithium
Ion secondary batteries are more batteries than lithium primary batteries
High voltage, especially when rechargeable batteries are charged
Since the voltage is considerably high at 4.1 to 4.2 V, the outer can
Cannot be used to prevent corrosion.
Was considered to be.
【０００６】正極として使用された外装缶の腐食による[0006] Corrosion of the outer can used as the positive electrode
液漏れは、外装缶を負極とすることで解決できる。外装Liquid leakage can be solved by using an outer can as a negative electrode. Exterior
缶を負極とする非水電解液二次電池は、外装缶をステンNon-aqueous electrolyte secondary batteries with a can as the negative electrode
レス製として腐食を防止できる。ただ、この構造の非水Corrosion can be prevented as a product made of less. However, this structure of non-water
電解液二次電池は、正極に接続して電流を外部に取り出The electrolyte secondary battery is connected to the positive electrode to extract current to the outside
す端子材料に、アルミニウムやアルミニウム合金を使用Uses aluminum and aluminum alloy for terminal materials
する必要がある。端子材料にステンレスを使用すると、There is a need to. When stainless steel is used for the terminal material,
鉄が溶解されるからである。アルミニウム製の端子材料This is because iron is dissolved. Aluminum terminal material
は、正極の芯材にアルミニウムを使用しているので、アBecause aluminum is used for the core material of the positive electrode,
ルミニウムどうしの溶接となり確実に接続するのが困難Luminium is welded together, making it difficult to connect securely
で、製品の歩留が悪くなる。とくに、角形小形の非水電As a result, the yield of products deteriorates. In particular, rectangular small non-hydroelectric
解液二次電池は、端子部品が小さいので、アルミニウムDissolved rechargeable batteries use aluminum
製端子材料を確実に接続するのが難しく、電池の歩留をIt is difficult to securely connect the terminal materials made of
低下させる。Lower.
【０００７】さらに、非水電解液二次電池は、優れた耐Further, the non-aqueous electrolyte secondary battery has excellent resistance to
熱性を有することも大切である。耐熱性は、非水電解液It is also important to have heat. Heat resistance is non-aqueous electrolyte
二次電池を充電するときと、放電する両使用状態に大切Important for both rechargeable battery charging and discharging
な特性である。充電するときに電池温度が設定値よりもCharacteristic. When charging, the battery temperature may
高くなると、保護回路が働いて、充電を停止させる。こWhen it goes high, the protection circuit works and stops charging. This
のため、充電時間が長くなる。また、充電中に電池温度Therefore, the charging time becomes longer. Also, the battery temperature during charging
が異常に高くなることは、電池性能を低下させる原因とAbnormally high battery performance
なる。放電中は電池のみでなく、電池を装着している機Become. During discharging, not only the battery but also the
器も温度が上昇する。たとえば、非水電解液二次電池がThe vessel also rises in temperature. For example, non-aqueous electrolyte secondary batteries
好んで電源に使用されるラップトップコンピュータは、Laptop computers that are preferred for power supply are
ＣＰＵが高速化されて、発生熱量が急激に大きくなってThe CPU speed has increased and the amount of heat generated has rapidly increased.
いる。このため、電池からの放熱が難しくなる。このたI have. For this reason, heat dissipation from the battery becomes difficult. others
め、非水電解液電池、とくに充電して使用する非水電解Non-aqueous electrolyte batteries, especially non-aqueous electrolytes that are charged and used
液二次電池は、電池内部で発生する熱をいかにして有効Liquid rechargeable batteries use heat generated inside the battery effectively
に放熱するかが、極めて大切である。It is very important to radiate the heat.
【０００８】[0008]
【発明が解決しようとする課題】本願発明の目的は、上
記のような問題点を解決し、高耐食性と、軽量化と、優
れた耐熱性とを実現する非水電解液二次電池を提供する
ものである。SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide high corrosion resistance, light weight, and excellent performance.
An object of the present invention is to provide a non-aqueous electrolyte secondary battery realizing improved heat resistance .
【０００９】[0009]
【課題を解決するための手段】本願発明の非水電解液二
次電池は、電池電圧を３．５Ｖ以上５．０Ｖ以下とし、
正極と、負極と、セパレータとからなる電極体と、非水
電解液と、外装缶とを備える。さらに、本発明の非水電
解液二次電池は、外装缶材料をアルミニウムとする。The nonaqueous electrolyte secondary battery of the present invention has a battery voltage of 3.5 V or more and 5.0 V or less,
An electrode body including a positive electrode, a negative electrode, and a separator, a nonaqueous electrolyte, and an outer can are provided. Further, in the nonaqueous electrolyte secondary battery of the present invention, the outer can material is aluminum.
【００１０】本発明の請求項２の非水電解液二次電池
は、正極の活物質をリチウム含有化合物とし、負極をリ
チウムイオンを吸蔵、放出できる炭素質材料とするリチ
ウムイオン二次電池である。The nonaqueous electrolyte secondary battery according to claim 2 of the present invention is a lithium ion secondary battery in which the active material of the positive electrode is a lithium-containing compound and the negative electrode is a carbonaceous material capable of absorbing and releasing lithium ions. .
【００１１】[0011]
【作用】外装缶に使用される材料としては、白金、チタ
ン、アルミニウム等が考えられるが、耐食性の面や工業
的スケール（資源及び材料コスト等）等を考慮すると、
使用される材料が規制され、安価で導電性も良好なアル
ミニウムが最適であることが判る。[Function] Platinum, titanium, aluminum, etc. can be considered as the material used for the outer can. However, considering corrosion resistance and industrial scale (resources and material costs, etc.),
It is understood that the material to be used is restricted, and aluminum that is inexpensive and has good conductivity is optimal.
【００１２】そこで、本願発明は、充電状態の電圧が
３．５Ｖ以上５．０Ｖ以下の非水電解液二次電池におい
て、正極缶などの腐食を防止するために、正極缶材料を
アルミニウムとするものであり、高耐食性が得られる。In view of the above, according to the present invention, in a non-aqueous electrolyte secondary battery having a charged state voltage of 3.5 V or more and 5.0 V or less, the positive electrode can is made of aluminum in order to prevent corrosion of the positive electrode can and the like. And high corrosion resistance is obtained.
【００１３】また、比重の小さいアルミニウムを外装缶
として用いることにより、軽量化において、優れた効果
を得ることができる。例えば、正極缶として、ステンレ
スとアルミニウムを用いた場合の重量エネルギー密度の
一比較例を表１に示す。Further, by using aluminum having a small specific gravity as the outer can, an excellent effect in weight reduction can be obtained. For example, Table 1 shows a comparative example of the weight energy density when stainless steel and aluminum are used as the positive electrode can.
【００１４】[0014]
【表１】 [Table 1]
【００１５】表１より、ステンレスと比較してアルミニ
ウムでは、重量エネルギー密度は約５０％増となる。As shown in Table 1, the weight energy density of aluminum is increased by about 50% as compared with stainless steel.
【００１６】さらにまた、非水電解液電池等を使用機器
等に組み込む時は限られた空間しかなく、その空間をよ
り有効に使用するためには、電池の外観は円筒形ではな
く角形で、特に矩形または長円形にする方が非常に有効
である。Furthermore, when a non-aqueous electrolyte battery or the like is incorporated into equipment to be used, there is only a limited space. In order to use that space more effectively, the appearance of the battery is not a cylinder but a prismatic shape. In particular, it is very effective to make a rectangle or an oval.
【００１７】しかしながら、ここで矩形の外装缶に渦巻
電極体を挿入するには、渦巻電極体は真円ではなく長円
形状でなくてはならない。このとき、長円形状の渦巻電
極体は、外装缶に挿入した後に真円に近い方へ戻ろうと
するために（図６）、外装缶の短径及び長径に復元力が
作用する。この復元力を利用して、外装缶と渦巻電極体
との接触圧を高め、良好な電気的接続を維持することが
できる。However, in order to insert the spiral electrode body into the rectangular outer can, the spiral electrode body must be not a perfect circle but an oval shape. At this time, a restoring force acts on the short diameter and the long diameter of the outer can because the elliptical spiral electrode body attempts to return to a direction closer to a perfect circle after being inserted into the outer can (FIG. 6). By utilizing this restoring force, the contact pressure between the outer can and the spiral electrode body can be increased, and good electrical connection can be maintained.
【００１８】ここで、長円形状の渦巻電極の短径ａ及び
長径ｂと外装缶開口部内周の短径Ａ及び長径Ｂとが、
（ａ／Ａ）≧（ｂ／Ｂ）且つ、（Ａ−ａ）≦（Ｂ−ｂ）
のような関係にあれば、主として短径方向で渦巻電極間
での緊迫度及び外装缶と最外周芯体との接触集電効果の
両方が最適に確保することができる。Here, the minor axis a and major axis b of the elliptical spiral electrode and the minor axis A and major axis B of the inner circumference of the outer can opening are defined by:
(A / A) ≧ (b / B) and (A−a) ≦ (B−b)
With such a relationship, both the degree of tightness between the spiral electrodes and the contact current collection effect between the outer can and the outermost core can be optimally secured mainly in the minor diameter direction.
【００１９】この理由は、長円形状渦巻電極体には真円
に近い方向への復元力が働き、長円形状渦巻電極体の長
径方向は縮む方向へ、短径方向は伸びる方向へ復元力が
作用するために良好な緊迫及び接触が得られることと、
短径方向のほうが渦巻電極体と外装缶とがフラットに近
い部分で接触する面積が大きいことによるものであるThe reason for this is that the restoring force acts on the elliptical spiral electrode body in a direction close to a perfect circle, and the restoring force acts in the direction of contraction in the major axis direction of the elliptical spiral electrode body and in the direction of extension in the minor axis direction. That good tension and contact are obtained for the action of
This is due to the fact that the area in which the spiral electrode body and the outer can come into contact with each other in the near-flat part is larger in the minor axis direction.
【００２０】[0020]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。Embodiments of the present invention will be described below with reference to the drawings.
【００２１】図１−ａは本発明の非水電解液二次電池に
内蔵される渦巻電極体の部分断面図、図１−ｂは渦巻電
極体の斜視図である。FIG. 1A is a partial sectional view of a spiral electrode body incorporated in the nonaqueous electrolyte secondary battery of the present invention, and FIG. 1B is a perspective view of the spiral electrode body.
【００２２】［正極の作製］活物質としてのコバルト酸
リチウムと、導電剤としてのアセチレンブラック及び結
着剤としてのフッ素樹脂ディスパージョンをそれぞれ重
量比で９０：６：４の比率で混練して正極合剤１−２を
得た。次いで、この正極合剤を芯体１−１としてのアル
ミニウム製のラス板に圧延して、これを２５０℃で２時
間真空熱処理して正極１を作製した。尚、正極の最外周
端部は正極合剤１−２を脱落させて、少なくとも芯体１
−１を一部分露出させている。[Preparation of Positive Electrode] Lithium cobaltate as an active material, acetylene black as a conductive agent, and a fluororesin dispersion as a binder were kneaded at a weight ratio of 90: 6: 4, respectively, to form a positive electrode. The mixture 1-2 was obtained. Next, this positive electrode mixture was rolled into an aluminum lath plate as a core body 1-1, and this was subjected to vacuum heat treatment at 250 ° C. for 2 hours to produce a positive electrode 1. In addition, the outermost end of the positive electrode drops the positive electrode mixture 1-2, and at least the core 1
-1 is partially exposed.
【００２３】［負極の作製］４００メッシュパスのグラ
ファイト粉末と、結着剤としてのフッ素樹脂ディスパー
ジョンとをそれぞれ重量比で９５：５の比率で混合し
て、負極合剤３−２を得た。次いで、この負極合剤を銅
製の芯体３−１に圧延して、これを２５０℃で２時間真
空下で熱処理して負極３を作製した。[Preparation of Negative Electrode] A graphite powder of 400 mesh pass and a fluororesin dispersion as a binder were mixed at a weight ratio of 95: 5, respectively, to obtain a negative electrode mixture 3-2. . Next, the negative electrode mixture was rolled into a copper core 3-1 and heat-treated at 250 ° C. for 2 hours under vacuum to prepare a negative electrode 3.
【００２４】［渦巻電極体の作製］上記正極１と、負極
３とをポリエチレン製微孔性薄膜のセパレータ２を介し
て巻回し、渦巻電極体４を作製した。[Preparation of Spiral Electrode Body] The positive electrode 1 and the negative electrode 3 were wound through a polyethylene microporous thin film separator 2 to prepare a spiral electrode body 4.
【００２５】図２は、非水電解液電池の分解構成斜視図
である。FIG. 2 is an exploded perspective view of the nonaqueous electrolyte battery.
【００２６】上記渦巻電極体４をアルミニウム製有底矩
形外装缶５中に収納する。次いで、溶媒として、エチレ
ンカーボネートと、ジメチルカーボネートとを体積比で
１：１の比率で混合して、溶質として、ＬｉＰＦ6を１
モル／リットルを混合溶媒に溶かした非水電解液を注液
し、外装缶開口部に安全弁装置を設けた封口体（図示し
ない）を溶接し、密閉して容積約１０ｃｃの非水電解液
電池を作製した。The spiral electrode body 4 is housed in an aluminum bottomed rectangular outer can 5. Next, ethylene carbonate and dimethyl carbonate were mixed at a volume ratio of 1: 1 as solvents, and LiPF 6 was added as a solute at 1: 1.
A non-aqueous electrolyte solution in which mol / liter is dissolved in a mixed solvent is injected, and a sealing member (not shown) provided with a safety valve device at the opening of the outer can is welded and sealed, and a non-aqueous electrolyte battery having a capacity of about 10 cc is sealed. Was prepared.
【００２７】次に、外装缶内周の短径をＡ、長径をＢ、
渦巻電極体の短径をａ、長径をｂとして、（ａ／Ａ）＞
（ｂ／Ｂ）且つ、（Ａ−ａ）＜（Ｂ−ｂ）の関係がある
ときの電池を本発明電池Ａ１として図３に示す。図３−
ａは渦巻電極体の断面図、図３−ｂは外装缶の断面図、
図３−ｃは本発明電池Ａ１の断面図である。Next, the minor axis of the inner circumference of the outer can is A, the major axis is B,
Assuming that the minor axis of the spiral electrode body is a and the major axis is b, (a / A)>
The battery when (b / B) and (A-a) <(B-b) are shown in FIG. 3 as the battery A1 of the present invention. Figure 3-
a is a sectional view of a spiral electrode body, FIG. 3-b is a sectional view of an outer can,
FIG. 3C is a cross-sectional view of the battery A1 of the present invention.
【００２８】このような上記の関係にあるときは、渦巻
電極体は図６に示すような復元力が渦巻電極体の短径方
向にかかるために、外装缶短径方向において、外装缶短
径方向と渦巻電極体短径方向との良好な緊迫度が得られ
る。In such a relationship, the spiral electrode body applies a restoring force as shown in FIG. 6 in the minor axis direction of the spiral electrode body. A good degree of tightness between the direction and the short diameter direction of the spiral electrode body is obtained.
【００２９】また、（ａ／Ａ）＝（ｂ／Ｂ）且つ、（Ａ
−ａ）＝（Ｂ−ｂ）のような関係のときの電池を、本発
明の実施例の電池Ａ２とし、図４に示す。図４−ａは渦
巻電極体の断面図、図４−ｂは外装缶の断面図、図４−
ｃは本発明の実施例の電池Ａ２の断面図である。Also, (a / A) = (b / B) and (A
FIG. 4 shows a battery in the case of -a) = (Bb) as the battery A2 of the embodiment of the present invention. 4A is a cross-sectional view of a spiral electrode body, FIG. 4-B is a cross-sectional view of an outer can, FIG.
c is a cross-sectional view of the battery A2 according to the example of the present invention.
【００３０】本発明の実施例の電池Ａ２は、外装缶内周
の短径と渦巻電極体の短径、外装缶内周の長径と渦巻電
極体の長径とがそれぞれ等しいときである。この場合
は、外装缶内周の短径及び長径に渦巻電極体の短径及び
長径がそれぞれに接している状態になる。In the battery A2 according to the embodiment of the present invention, the minor axis of the inner periphery of the outer can and the minor axis of the spiral electrode body, and the major axis of the inner periphery of the outer can and the major axis of the spiral electrode body are respectively equal. In this case, the short diameter and the long diameter of the spiral electrode body are in contact with the short diameter and the long diameter of the inner circumference of the outer can.
【００３１】次に、（ａ／Ａ）＜（ｂ／Ｂ）且つ、（Ａ
−ａ）＞（Ｂ−ｂ）のような関係のときの状態の電池を
比較電池Ｘとして図５に示す。図５−ａは渦巻電極体の
断面図、図５−ｂは外装缶の断面図、図５−ｃは比較電
池Ｘの断面図である。Next, (a / A) <(b / B) and (A
FIG. 5 shows a battery in a state where the relationship of −a)> (Bb) is established as a comparative battery X. 5A is a sectional view of the spiral electrode body, FIG. 5B is a sectional view of the outer can, and FIG. 5C is a sectional view of the comparative battery X.
【００３２】この場合、渦巻電極体の短径方向の寸法が
外装缶内周の短径方向の寸法よりも小さいために、短径
方向では接触しない状態になる。これでは、長径方向で
しか緊迫度が得られないために電池特性に悪影響を及ぼ
す。In this case, since the dimension in the minor axis direction of the spiral electrode body is smaller than the dimension in the minor axis direction of the inner circumference of the outer can, no contact occurs in the minor axis direction. In this case, the degree of tension can be obtained only in the long diameter direction, which adversely affects the battery characteristics.
【００３３】［実験１］次に、本発明の実施例の電池Ａ
１及びＡ２と、比較電池Ｘのそれぞれ１０個の初期内部
抵抗とショート電流とを測定し、それらの平均値を表２
に示した。[Experiment 1] Next, the battery A of the embodiment of the present invention was used.
1 and A2 and 10 initial internal resistances and short-circuit currents of the comparative battery X were measured.
It was shown to.
【００３４】[0034]
【表２】 [Table 2]
【００３５】このように本発明の実施例の電池Ａ１及び
Ａ２では、渦巻電極体の緊迫度が高くなることで、外装
缶と渦巻電極体との接触強度も増加し、さらに、電極間
距離も小さくなり、初期内部抵抗も小さくなり電池特性
が向上する。As described above, in the batteries A1 and A2 according to the embodiment of the present invention, the contact strength between the outer can and the spiral electrode body is increased by increasing the tension of the spiral electrode body, and the distance between the electrodes is also reduced. As a result, the initial internal resistance decreases, and the battery characteristics are improved.
【００３６】［実験２］図７及び図８に、本発明の実施
例の電池Ａ１及びＡ２と比較電池Ｘとの電池特性の比較
を示す。[Experiment 2] FIGS. 7 and 8 show a comparison of battery characteristics between the batteries A1 and A2 of the embodiment of the present invention and the comparative battery X.
【００３７】図７は、本発明の実施例の電池Ａ１、Ａ２
及び比較電池Ｘの放電特性を示した図であり、測定条件
は、２００ｍＡの電流で電池電圧が４．２Ｖに達するま
で充電した後、２００ｍＡの電流で電池電圧が２．７Ｖ
に達するまで放電した曲線を示したものである。FIG. 7 shows the batteries A1 and A2 according to the embodiment of the present invention.
FIG. 5 is a diagram showing the discharge characteristics of a comparative battery X. The measurement conditions were as follows: the battery was charged at a current of 200 mA until the battery voltage reached 4.2 V, and the battery voltage was 2.7 V at a current of 200 mA.
FIG. 4 shows a curve discharged until the temperature reaches the threshold value.
【００３８】図７より、本発明の実施例の電池Ａ１及び
Ａ２の方が、比較電池Ｘよりも放電容量が大きいことが
判る。FIG. 7 shows that the batteries A1 and A2 of the embodiment of the present invention have a larger discharge capacity than the comparative battery X.
【００３９】また、図８は、サイクル特性を示した図で
あり、測定条件は２００ｍＡの電流で電池電圧が４．２
Ｖに達するまで充電した後、２００ｍＡの電流で電池電
圧が２．７Ｖに達するまで放電するというサイクルを繰
り返すものである。FIG. 8 is a graph showing the cycle characteristics. The measurement conditions were as follows: a current of 200 mA and a battery voltage of 4.2.
After the battery is charged until the battery voltage reaches 2.7 V, the battery is discharged at a current of 200 mA until the battery voltage reaches 2.7 V.
【００４０】図８より、本発明の実施例の電池Ａ１及び
Ａ２は、比較電池Ｘと比べて、サイクル特性が向上して
いることが判る。FIG. 8 shows that the batteries A1 and A2 of the example of the present invention have improved cycle characteristics as compared with the comparative battery X.
【００４１】[0041]
【発明の効果】本発明の非水電解液二次電池は、正極
と、負極とセパレータとからなる電極体と、非水電解液
と、外装缶とから構成される電池電圧が３．５Ｖ以上
５．０Ｖ以下の非水電解液電池であって、外装缶材料を
アルミニウムとするので、充電するときの高電圧に対す
る腐食性が向上し、かつ、電池自身の軽量化を計ること
ができる。The non-aqueous electrolyte secondary battery of the present invention has a battery voltage of 3.5 V or more composed of a positive electrode, an electrode body including a negative electrode and a separator, a non-aqueous electrolyte, and an outer can. Since it is a non-aqueous electrolyte battery of 5.0 V or less and the outer can material is aluminum, the corrosiveness to a high voltage at the time of charging is improved , and the weight of the battery itself can be reduced.
【００４２】さらに、本発明の非水電解液二次電池は、
外装缶をアルミニウムとするので、充電するときに内部
で発生する熱を外装缶から効率よく放熱する。アルミニ
ウムの熱伝導率が、ステンレス等に比較して極めて大き
いからである。このため、本発明の非水電解液二次電池
は、急速充電されるときに、保護回路が動作するのを防
止して、短時間で急速充電できる特長がある。また、周
囲に発熱量の多い部品が内蔵される好ましくない温度環
境で使用されても、電池の内部で発生する熱をアルミニ
ウム製の外装缶から有効に放熱する。このため、厳しい
使用環境においても、安心して使用できる特長がある。 Furthermore, the non-aqueous electrolyte secondary battery of the present invention
Since the outer can is made of aluminum, the inner
Heat generated from the outer can is efficiently radiated. Armini
The thermal conductivity of aluminum is extremely large compared to stainless steel etc.
Because it is. Therefore, the non-aqueous electrolyte secondary battery of the present invention
Prevents the protection circuit from operating when the battery is rapidly charged.
It has the feature that it can be stopped and fast charged in a short time. Also,
Undesirable temperature ring with components that generate a lot of heat
Heat generated inside the battery even when used in
Effectively dissipates heat from the aluminum outer can. Because of this, severe
It has the feature that it can be used safely in the use environment.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明電池の渦巻電極体の構成図である。FIG. 1 is a configuration diagram of a spiral electrode body of a battery of the present invention.
【図２】 本発明電池の分解構成図である。FIG. 2 is an exploded view of the battery of the present invention.
【図３】 ａ 本発明の実施例の電池Ａ１の渦巻電極体
断面図である。 ｂ 外装缶の断面図である。 ｃ 本発明電池Ａ１の断面図である。FIG. 3A is a cross-sectional view of a spiral electrode body of a battery A1 according to an example of the present invention. b It is sectional drawing of an exterior can. c is a cross-sectional view of the battery A1 of the present invention.
【図４】 ａ 本発明電池Ａ２の渦巻電極体断面図であ
る。 ｂ 外装缶の断面図である。 ｃ 本発明電池Ａ２の断面図である。FIG. 4a is a cross-sectional view of a spiral electrode body of the battery A2 of the present invention. b It is sectional drawing of an exterior can. c It is sectional drawing of this invention battery A2.
【図５】 ａ 比較電池Ｘの渦巻電極体断面図である。 ｂ 外装缶の断面図である。 ｃ 比較電池Ｘの断面図である。5A is a cross-sectional view of a spiral electrode body of a comparative battery X. FIG. b It is sectional drawing of an exterior can. c is a sectional view of a comparative battery X.
【図６】 渦巻電極体の復元力の説明図である。FIG. 6 is an explanatory diagram of a restoring force of a spiral electrode body.
【図７】 放電特性を示す図である。FIG. 7 is a diagram showing discharge characteristics.
【図８】 サイクル特性を示す図である。FIG. 8 is a diagram showing cycle characteristics.
【符号の説明】 １・・・・・・正極 １−１・・・・正極芯体 １−２・・・・正極活物質 ２・・・・・・セパレータ ３・・・・・・負極 ３−１・・・・負極芯体 ３−２・・・・負極活物質 ４・・・・・・渦巻電極体 ５・・・・・・アルミニウム外装缶 Ａ１・・・・・本発明電池 Ａ２・・・・・本発明電池 Ｘ・・・・・・比較電池[Description of Signs] 1 ... Positive electrode 1-1 ... Positive electrode core 1-2 ... Positive electrode active material 2 ... Separator 3 ... Negative electrode 3 -1 ... Negative electrode core 3-2 ... Negative electrode active material 4 ... Spiral electrode body 5 ... Aluminum outer can A1 ... Battery of the present invention A2 .... Battery of the present invention X ... Comparative battery
───────────────────────────────────────────────────── フロントページの続き (72)発明者 辻奥 啓一 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 雨堤 徹 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 玉置 日義 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 山内 康弘 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 (72)発明者 生川 訓 大阪府守口市京阪本通２丁目５番５号 三 洋電機株式会社内 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Keiichi Tsujioku 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Tohru Atsutsumi 2 Keihanhondori, Moriguchi-shi, Osaka 5-5-5 Sanyo Electric Co., Ltd. (72) Inventor Tamaki Hiyoshi 2-5-5 Sanyo Electric Co., Ltd. Sanyo Electric Co., Ltd. (72) Inventor Yasuhiro Yamauchi Keihan Moriguchi, Osaka 2-5-5 Hondori Sanyo Electric Co., Ltd. (72) Inventor Naru Ikukawa 2-5-5 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.
Claims (2)
電極体と、非水電解液と、外装缶とから構成される電池
電圧が３．５Ｖ以上５．０Ｖ以下の非水電解液二次電池
において、外装缶材料をアルミニウムとすることを特徴
とする非水電解液二次電池。1. A non-aqueous electrolyte secondary battery having a battery voltage of 3.5 V or more and 5.0 V or less, comprising an electrode body including a positive electrode, a negative electrode, and a separator, a non-aqueous electrolyte, and an outer can. A non-aqueous electrolyte secondary battery, wherein the outer can material is aluminum.
であり、前記負極はリチウムイオンを吸蔵、放出できる
炭素質材料であることを特徴とする請求項１記載の非水
電解液二次電池。2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the active material of the positive electrode is a lithium-containing compound, and the negative electrode is a carbonaceous material capable of inserting and extracting lithium ions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9119422A JP3030263B2 (en) | 1997-05-09 | 1997-05-09 | Non-aqueous electrolyte secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9119422A JP3030263B2 (en) | 1997-05-09 | 1997-05-09 | Non-aqueous electrolyte secondary battery |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4305298A Division JP3059842B2 (en) | 1992-11-16 | 1992-11-16 | Non-aqueous electrolyte battery |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10344385A Division JPH11233074A (en) | 1992-11-16 | 1998-12-03 | Nonaqueous electrolyte secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1050272A true JPH1050272A (en) | 1998-02-20 |
| JP3030263B2 JP3030263B2 (en) | 2000-04-10 |
Family
ID=14761073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9119422A Expired - Lifetime JP3030263B2 (en) | 1997-05-09 | 1997-05-09 | Non-aqueous electrolyte secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3030263B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0910129A1 (en) * | 1997-10-14 | 1999-04-21 | Ngk Insulators, Ltd. | Lithium secondary battery |
| JPH11283668A (en) * | 1998-03-30 | 1999-10-15 | Sanyo Electric Co Ltd | Lithium ion battery |
| JP2000208169A (en) * | 1999-01-18 | 2000-07-28 | Mitsubishi Chemicals Corp | Nonaqueous electrolyte secondary battery |
| WO2007065322A1 (en) * | 2005-12-09 | 2007-06-14 | Citic Guoan Mengguli New Energy Technology Co., Ltd. | Lithium-ion storage battery with flexible external material of cylindric aluminum-plastic laminated film |
| US7927739B2 (en) | 2001-12-14 | 2011-04-19 | The Gillette Company | Non-aqueous electrochemical cells |
-
1997
- 1997-05-09 JP JP9119422A patent/JP3030263B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0910129A1 (en) * | 1997-10-14 | 1999-04-21 | Ngk Insulators, Ltd. | Lithium secondary battery |
| US6352793B2 (en) | 1997-10-14 | 2002-03-05 | Ngk Insulators, Ltd. | Lithium secondary battery |
| US6841297B2 (en) | 1997-10-14 | 2005-01-11 | Ngk Insulators, Ltd. | Lithium secondary battery |
| JPH11283668A (en) * | 1998-03-30 | 1999-10-15 | Sanyo Electric Co Ltd | Lithium ion battery |
| JP2000208169A (en) * | 1999-01-18 | 2000-07-28 | Mitsubishi Chemicals Corp | Nonaqueous electrolyte secondary battery |
| US7927739B2 (en) | 2001-12-14 | 2011-04-19 | The Gillette Company | Non-aqueous electrochemical cells |
| WO2007065322A1 (en) * | 2005-12-09 | 2007-06-14 | Citic Guoan Mengguli New Energy Technology Co., Ltd. | Lithium-ion storage battery with flexible external material of cylindric aluminum-plastic laminated film |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3030263B2 (en) | 2000-04-10 |
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