JP3438301B2 - Non-aqueous electrolyte secondary battery - Google Patents
Non-aqueous electrolyte secondary batteryInfo
- Publication number
- JP3438301B2 JP3438301B2 JP06366094A JP6366094A JP3438301B2 JP 3438301 B2 JP3438301 B2 JP 3438301B2 JP 06366094 A JP06366094 A JP 06366094A JP 6366094 A JP6366094 A JP 6366094A JP 3438301 B2 JP3438301 B2 JP 3438301B2
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- battery
- aqueous electrolyte
- electrolyte secondary
- secondary 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.)
- Expired - Fee Related
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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、非水電解液二次電池に
関し、特に負極集電に用いる負極リードの改良に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte secondary battery, and more particularly to improvement of a negative electrode lead used for collecting negative electrode current.
【０００２】[0002]
【従来の技術】近年、電子技術の進歩により、電子機器
の高性能化、小型化、ポータブル化が進み、これらの電
子機器に使用される高エネルギー密度の二次電池の要求
が強まっている。2. Description of the Related Art In recent years, advances in electronic technology have led to advances in performance, miniaturization, and portability of electronic equipment, and the demand for high energy density secondary batteries used in these electronic equipment is increasing.
【０００３】これらの電子機器に使用される二次電池と
しては、ニッケル・カドミウム電池や鉛電池などが挙げ
られるが、これらの電池では、放電電位が低く、エネル
ギー密度の高い電池を得るという点ではまだ不十分であ
る。Secondary batteries used in these electronic devices include nickel-cadmium batteries and lead batteries, and these batteries are low in discharge potential and high in energy density. Still not enough.
【０００４】そこで最近は、リチウムやリチウム合金も
しくは炭素材料のようなリチウムイオンをドープ及び脱
ドープすることが可能な物質を負極として用い、また正
極にリチウムコバルト複合酸化物などのリチウム複合酸
化物を使用する非水電解液二次電池の研究・開発が行わ
れている。この電池は、電池電圧が高く、高エネルギー
密度を有し、自己放電も少なく、かつサイクル特性に優
れている。Therefore, recently, a substance such as lithium, a lithium alloy or a carbon material, which can be doped and dedoped with lithium ions is used as a negative electrode, and a lithium composite oxide such as a lithium cobalt composite oxide is used as a positive electrode. Research and development of non-aqueous electrolyte secondary batteries to be used are being conducted. This battery has a high battery voltage, a high energy density, little self-discharge, and excellent cycle characteristics.
【０００５】上記非水電解液二次電池としては、例え
ば、帯状のアルミニウムの正極集電体の両面に正極活物
質を塗布して形成された正極と、帯状の銅の負極集電体
の両面に負極活物質を塗布して形成された負極とを、絶
縁体を介して巻回して巻回電極体とし、この巻回電極体
を上下に絶縁板を設置した状態で電池缶に収納した後、
電池蓋にて電池缶を密閉してなる円筒型非水電解液二次
電池が知られている。Examples of the non-aqueous electrolyte secondary battery include a positive electrode formed by applying a positive electrode active material on both sides of a strip-shaped aluminum positive electrode current collector and both sides of a strip-shaped copper negative electrode current collector. The negative electrode formed by applying the negative electrode active material to the electrode is wound around an insulator to form a spirally wound electrode body, and the spirally wound electrode body is housed in a battery can with an insulating plate installed above and below. ,
A cylindrical non-aqueous electrolyte secondary battery in which a battery can is sealed with a battery lid is known.
【０００６】この円筒型非水電解液二次電池では、負極
の集電を行うために、負極集電体に溶接されたニッケル
製負極リードにて、負極と電池缶とが電気的に導通する
ようになっている。また、正極の集電を行うために、正
極集電体に溶接されたアルミニウム製正極リードにて、
正極と電池蓋とが電気的に導通するようになっている。
なお、負極リードに、負極集電体と同じである銅を用い
ずに、ニッケルを用いるのは、負極集電体への溶接が容
易である、取扱いが容易である等の理由による。In this cylindrical type non-aqueous electrolyte secondary battery, in order to collect the current of the negative electrode, the negative electrode made of nickel welded to the negative electrode current collector electrically connects the negative electrode and the battery can. It is like this. Further, in order to collect the current of the positive electrode, an aluminum positive electrode lead welded to the positive electrode current collector,
The positive electrode and the battery lid are electrically connected.
The reason why nickel is used for the negative electrode lead instead of copper, which is the same as the negative electrode current collector, is because welding to the negative electrode current collector is easy and handling is easy.
【０００７】[0007]
【発明が解決しようとする課題】上記非水電解液二次電
池では、外部ショート等により大電流が流れると集電部
が発熱し、電池温度が上昇するという問題がある。前記
温度上昇は、特に負極リードからの発熱の影響が大き
い。なぜなら、負極リードは、他の集電部、例えば、負
極集電体に用いられる銅や、正極集電体及び正極リード
に用いられるアルミニウム等よりも、電気抵抗が大き
く、発熱しやすいからである。The above-mentioned non-aqueous electrolyte secondary battery has a problem that the current collecting portion generates heat when a large current flows due to an external short circuit or the like, and the battery temperature rises. The temperature rise is greatly affected by heat generated from the negative electrode lead. This is because the negative electrode lead has a larger electric resistance and is more likely to generate heat than other current collectors such as copper used for the negative electrode current collector and aluminum used for the positive electrode current collector and the positive electrode lead. .
【０００８】この負極リードの発熱量は、負極リードの
断面積に反比例するので、負極リードの幅が広ければ広
いほど、又は負極リードの厚みが厚ければ厚いほど、負
極リードの発熱量は小さくなる。そのため、外部ショー
ト等により大電流が流れたときの電池温度の上昇を抑え
るためには、負極リードの断面積を大きくすればよい。
しかし、負極リードの断面積が大きすぎると、すなわ
ち、負極リードの幅が広すぎたり、負極リードの厚みが
厚すぎたりすると、電池の製造工程において、巻回電極
体を電池缶に挿入する際に、負極リードが電池缶に引っ
かかり、巻回電極体の挿入不良が発生しやすいという問
題がある。Since the amount of heat generated by the negative electrode lead is inversely proportional to the cross-sectional area of the negative electrode lead, the larger the width of the negative electrode lead or the thicker the negative electrode lead, the smaller the amount of generated heat of the negative electrode lead. Become. Therefore, in order to suppress the rise in battery temperature when a large current flows due to an external short circuit or the like, the cross-sectional area of the negative electrode lead may be increased.
However, if the cross-sectional area of the negative electrode lead is too large, that is, if the width of the negative electrode lead is too wide or the thickness of the negative electrode lead is too thick, when the wound electrode body is inserted into the battery can during the battery manufacturing process. In addition, there is a problem in that the negative electrode lead is caught in the battery can and the defective insertion of the wound electrode body is likely to occur.
【０００９】本発明は、このような課題に鑑みてなされ
たものであり、外部ショート等が生じて大電流が流れて
も電池の温度上昇が少なく、その上、製造工程において
巻回電極体の挿入不良が発生しにくく生産性が高い非水
電解液二次電池を提供することを目的とする。The present invention has been made in view of the above problems, and even if a large current flows due to an external short circuit or the like, the temperature rise of the battery is small, and moreover, the winding electrode body is manufactured in the manufacturing process. It is an object of the present invention to provide a non-aqueous electrolyte secondary battery that is less likely to cause insertion failure and has high productivity.
【００１０】[0010]
【課題を解決するための手段】上述の目的を達成するた
めに、本発明者は、非水電解液二次電池について、電池
容量、負極リードの断面積、外部ショート発生時の電池
の温度上昇、及び巻回電極体の挿入不良等の関係につい
て実験を重ねて検討した結果、本発明を成すに至った。In order to achieve the above-mentioned object, the present inventor has studied the battery capacity, the cross-sectional area of the negative electrode lead, and the temperature rise of the battery when an external short circuit occurs in the non-aqueous electrolyte secondary battery. The present invention has been accomplished as a result of repeated examinations on the relationship between the winding electrode body and the insertion failure of the wound electrode body.
【００１１】すなわち、本発明の非水電解液二次電池
は、帯状の集電体の両面に活物質合剤を塗布し成型され
た帯状の正極および帯状の負極を、セパレーターを介し
て、多数回巻回された巻回電極体と、前記巻回電極体を
収納する電池容器と、非水電解液とを備え、前記負極の
端部には、１つのニッケル製の負極リードが溶接され、
かつ、前記ニッケル製の負極リードは、前記電池容器に
溶接されてなる非水電解液二次電池において、電池容量
と前記負極リードの断面積の比が１．６Ａｈ／ｍｍ２〜
７．９Ａｈ／ｍｍ２であることを特徴とする。That is, in the non-aqueous electrolyte secondary battery of the present invention, a strip-shaped positive electrode and a strip-shaped negative electrode formed by coating the active material mixture on both sides of a strip-shaped current collector are provided through a separator. A wound spirally wound electrode body, a battery container accommodating the spirally wound electrode body, and a non-aqueous electrolyte are provided, and one negative electrode lead made of nickel is welded to an end portion of the negative electrode.
The nickel negative electrode lead has a ratio of a battery capacity to a cross-sectional area of the negative electrode lead of 1.6 Ah / mm 2 to
It is characterized in that it is 7.9 Ah / mm 2 .
【００１２】なお、電池容量の測定は、例えば、終止電
圧２．７５Ｖ、２．５時間率として測定する。The battery capacity is measured, for example, as a final voltage of 2.75 V and a 2.5 hour rate.
【００１３】[0013]
【作用】本発明の非水電解液二次電池は、外部ショート
等が生じて大電流が流れても、あまり電池の温度が上昇
することがない。その上、製造工程において、巻回電極
体の挿入不良が発生しにくい。In the non-aqueous electrolyte secondary battery of the present invention, the battery temperature does not rise so much even when a large current flows due to an external short circuit or the like. In addition, defective insertion of the wound electrode body is unlikely to occur in the manufacturing process.
【００１４】[0014]
【実施例】以下に、本発明を適用した具体的な実施例に
ついて、図面を参照しながら説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described below with reference to the drawings.
【００１５】実施例１
図１に示すような非水電解液二次電池を次のように作製
した。まず、正極２を次のように作製した。まず、炭酸
リチウムと炭酸コバルトをＬｉ／Ｃｏ（モル比）＝１に
なるように混合し、空気中で９００℃、５時間焼成し
た。この材料についてＸ線回折測定を行った結果、ＪＣ
ＰＤＳカードのＬｉＣｏＯ2 と良く一致していた。そし
て、このＬｉＣｏＯ2 ９５重量部と炭酸リチウム５重量
部とを混合して正極活物質とした。そして、この正極活
物質を９１重量部、電導材としてグラファイトＫＳ−１
５を６重量部、及び結着剤としてポリフッ化ビニリデン
（ＰＶＤＦ）を３重量部を混合し正極合剤を作製して、
これをＮ−メチル２ピロリドンに分散させてスラリー状
にした。そして、正極集電体として帯状アルミニウム箔
を用い、この正極集電体１１の両面に、正極合剤（スラ
リー）を均一に塗布し、乾燥させた後、ロールプレス機
で圧縮成型し、帯状の正極２を作製した。 Example 1 A non-aqueous electrolyte secondary battery as shown in FIG. 1 was produced as follows. First, the positive electrode 2 was manufactured as follows. First, lithium carbonate and cobalt carbonate were mixed so that Li / Co (molar ratio) = 1, and the mixture was baked in air at 900 ° C. for 5 hours. As a result of X-ray diffraction measurement of this material, JC
It was in good agreement with LiCoO 2 of the PDS card. Then, 95 parts by weight of this LiCoO 2 and 5 parts by weight of lithium carbonate were mixed to obtain a positive electrode active material. And 91 parts by weight of this positive electrode active material, graphite KS-1 as a conductive material
6 parts by weight of 5 and 3 parts by weight of polyvinylidene fluoride (PVDF) as a binder were mixed to prepare a positive electrode mixture,
This was dispersed in N-methyl-2-pyrrolidone to form a slurry. Then, using a strip-shaped aluminum foil as the positive electrode current collector, the positive electrode mixture (slurry) is uniformly applied to both surfaces of the positive electrode current collector 11, dried and then compression-molded by a roll press machine to obtain a strip-shaped aluminum foil. A positive electrode 2 was produced.
【００１６】次に、負極１を次のように作製した。負極
活物質には、出発材料に石油ピッチを用い、これに酸素
を含む官能基を１０％〜２０％導入（いわゆる酸素架
橋）した後、不活性ガス気流中１０００℃で焼成して得
られたガラス状炭素に近い性質を持つ難黒鉛炭素材料粉
末を用いた。この材料について、Ｘ線回折測定を行った
結果、（００２）面の面間隔は０．３７６ｎｍで、ま
た、真比重は１．５８であった。このようにして得られ
た炭素材料９０重量部と、結着剤としてポリフッ化ビニ
リデン（ＰＶＤＦ）１０重量部とを混合して負極合剤を
作製し、この負極合剤をＮ−メチル２ピロリドンに分散
させてスラリー状にした。負極集電体として帯状銅箔を
用い、この負極集電体１０の両面に、負極合剤（スラリ
ー）を均一に塗布し、乾燥させた後、ローラープレス機
で圧縮成型し、帯状の負極１を作製した。そして、この
負極１の端部に、集電をとるための厚さ０．１ｍｍ、幅
４ｍｍのニッケル製の負極リード１２を溶接した。Next, the negative electrode 1 was manufactured as follows. The negative electrode active material was obtained by using petroleum pitch as a starting material, introducing a functional group containing oxygen into this by 10% to 20% (so-called oxygen crosslinking), and then firing at 1000 ° C. in an inert gas stream. A non-graphite carbon material powder having properties close to those of glassy carbon was used. As a result of X-ray diffraction measurement of this material, the (002) plane spacing was 0.376 nm, and the true specific gravity was 1.58. 90 parts by weight of the carbon material thus obtained and 10 parts by weight of polyvinylidene fluoride (PVDF) as a binder were mixed to prepare a negative electrode mixture, and this negative electrode mixture was converted into N-methyl-2pyrrolidone. Dispersed into a slurry. A strip-shaped copper foil is used as the negative electrode current collector, and the negative electrode mixture (slurry) is uniformly applied to both surfaces of the negative electrode current collector 10, dried and then compression molded with a roller press machine to obtain the strip-shaped negative electrode 1 Was produced. Then, a nickel negative electrode lead 12 having a thickness of 0.1 mm and a width of 4 mm for collecting current was welded to the end portion of the negative electrode 1.
【００１７】以上のように作製した負極１と正極２と
を、厚さ２５μｍの微多孔性ポリプロピレンフィルムよ
りなるセパレーター３を介して積層し、多数回巻回する
ことにより巻回電極体を作製した。なお、巻回は、セパ
レーターの端部をまずセンターピン１４に巻き取り、こ
れを中心に多数回巻回した。The negative electrode 1 and the positive electrode 2 produced as described above were laminated with a separator 3 made of a microporous polypropylene film having a thickness of 25 μm interposed therebetween, and wound many times to produce a wound electrode body. . Regarding the winding, the end of the separator was first wound around the center pin 14 and wound around this center many times.
【００１８】次に、ニッケルメッキを施した鉄製の電池
缶５に、電池缶５の底部に絶縁板４を挿入した上で、前
記巻回電極体を収納した。このとき、負極１の集電をと
るために、負極１の端部に取り付けられたニッケル製の
負極リード１２を電池缶５に溶接した。また、正極２の
集電をとるために、正極２の端部にアルミニウム製の正
極リード１３の一端を取り付け、前記正極リード１３の
他の一端を、巻回電極体と電池蓋７との間に配設される
安全弁装置８に溶接した。Next, after inserting the insulating plate 4 into the bottom of the battery can 5 into the nickel-plated iron battery can 5, the wound electrode body was housed. At this time, in order to collect the current of the negative electrode 1, the negative electrode lead 12 made of nickel attached to the end of the negative electrode 1 was welded to the battery can 5. Further, in order to collect the current of the positive electrode 2, one end of a positive electrode lead 13 made of aluminum is attached to the end portion of the positive electrode 2, and the other end of the positive electrode lead 13 is provided between the spirally wound electrode body and the battery lid 7. It was welded to the safety valve device 8 arranged in the.
【００１９】なお、安全弁装置８は、アルミニウムに切
り込みを入れたもので、電池内圧が一定以上になると、
切り込み部が開裂し、内圧を開放するとともに、正極リ
ード１３と電池蓋７との間の接続が切れ、電流を遮断す
るものである。The safety valve device 8 is made by cutting aluminum, and when the internal pressure of the battery exceeds a certain level,
The cut portion is torn open to release the internal pressure, and the connection between the positive electrode lead 13 and the battery lid 7 is broken to cut off the current.
【００２０】そして、電池缶５の中にプロピレンカーボ
ネートとジエチルカーボネートとの等容量混合溶媒中に
ＬｉＰＦ6 を１モル／ｌの割合で溶解した非水電解液を
注入して、巻回電極体に含浸させた。Then, a non-aqueous electrolytic solution prepared by dissolving LiPF 6 in a mixed solvent of equal volume of propylene carbonate and diethyl carbonate at a ratio of 1 mol / l was poured into the battery can 5, and the wound electrode body was filled with the non-aqueous electrolytic solution. Impregnated.
【００２１】そして、安全弁装置８上に、感熱電池遮断
素子９（ＰＴＣ素子）と電池蓋７とを、電池缶５に蓋を
するように、この順に重ねた後、アフファルトを塗布し
た絶縁封口ガスケット６を介して電池缶５をかしめて、
これらを固定して、直径１８ｍｍ、高さ６５ｍｍの円筒
型非水電解液二次電池を作製した。Then, a thermosensitive battery blocking element 9 (PTC element) and a battery lid 7 are stacked on the safety valve device 8 in this order so as to cover the battery can 5, and then an insulating sealing gasket coated with afphalt. Crimp the battery can 5 through 6,
By fixing these, a cylindrical non-aqueous electrolyte secondary battery having a diameter of 18 mm and a height of 65 mm was produced.
【００２２】なお、感熱電池遮断素子９は、電池温度が
上昇したときに電流が流れるのを抑制するための素子で
ある。すなわち、周囲温度の上昇により熱せられて、あ
る臨界温度（例えば、１２０℃前後）に達すると、急激
に電気抵抗が増大（例えば、１０万倍以上）して、電流
値を抑制するものである。The thermal battery cutoff element 9 is an element for suppressing the flow of current when the battery temperature rises. That is, when it is heated by an increase in ambient temperature and reaches a certain critical temperature (for example, around 120 ° C.), the electric resistance rapidly increases (for example, 100,000 times or more) and the current value is suppressed. .
【００２３】実施例２
負極リードに、厚さ０．１ｍｍ、幅４ｍｍのニッケル製
の負極リードを用いて、直径２６ｍｍ、高さ６５ｍｍの
円筒型非水電解液二次電池を、実施例１と同様に作製し
た。 Example 2 A nickel-made negative electrode lead having a thickness of 0.1 mm and a width of 4 mm was used as the negative electrode lead, and a cylindrical non-aqueous electrolyte secondary battery having a diameter of 26 mm and a height of 65 mm was prepared as in Example 1. It produced similarly.
【００２４】実施例３
負極リードに、厚さ０．１ｍｍ、幅６ｍｍのニッケル製
の負極リードを用いて、直径２６ｍｍ、高さ６５ｍｍの
円筒型非水電解液二次電池を、実施例１と同様に作製し
た。 Example 3 A nickel-type negative electrode lead having a thickness of 0.1 mm and a width of 6 mm was used as a negative electrode lead, and a cylindrical non-aqueous electrolyte secondary battery having a diameter of 26 mm and a height of 65 mm was prepared as in Example 1. It produced similarly.
【００２５】比較例１
負極リードに、厚さ０．１ｍｍ、幅１．５ｍｍのニッケ
ル製の負極リードを用いて、直径１８ｍｍ、高さ６５ｍ
ｍの円筒型非水電解液二次電池を、実施例１と同様に作
製した。 Comparative Example 1 A negative electrode lead made of nickel having a thickness of 0.1 mm and a width of 1.5 mm was used as the negative electrode lead, and the diameter was 18 mm and the height was 65 m.
A cylindrical non-aqueous electrolyte secondary battery of m was prepared in the same manner as in Example 1.
【００２６】比較例２
負極リードに、厚さ０．１ｍｍ、幅３ｍｍのニッケル製
の負極リードを用いて、直径２６ｍｍ、高さ６５ｍｍの
円筒型非水電解液二次電池を、実施例１と同様に作製し
た。 Comparative Example 2 A nickel-type negative electrode lead having a thickness of 0.1 mm and a width of 3 mm was used as a negative electrode lead, and a cylindrical non-aqueous electrolyte secondary battery having a diameter of 26 mm and a height of 65 mm was prepared as in Example 1. It produced similarly.
【００２７】比較例３
負極リードに、厚さ０．２ｍｍ、幅４ｍｍのニッケル製
の負極リードを用いて、直径１８ｍｍ、高さ６５ｍｍの
円筒型非水電解液二次電池を、実施例１と同様に作製し
た。 Comparative Example 3 A negative electrode lead made of nickel having a thickness of 0.2 mm and a width of 4 mm was used as a negative electrode lead, and a cylindrical non-aqueous electrolyte secondary battery having a diameter of 18 mm and a height of 65 mm was prepared as in Example 1. It produced similarly.
【００２８】比較例４
負極リードに、厚さ０．３ｍｍ、幅６ｍｍのニッケル製
の負極リードを用いて、直径２６ｍｍ、高さ６５ｍｍの
円筒型非水電解液二次電池を、実施例１と同様に作製し
た。 Comparative Example 4 A negative electrode lead made of nickel having a thickness of 0.3 mm and a width of 6 mm was used as a negative electrode lead, and a cylindrical non-aqueous electrolyte secondary battery having a diameter of 26 mm and a height of 65 mm was prepared as in Example 1. It produced similarly.
【００２９】このようにして各実施例及び各比較例の非
水電解液二次電池を１００本ずつ作製して、製造工程に
おいて巻回電極体の挿入不良が生じた電池の数を調べ
た。In this manner, 100 non-aqueous electrolyte secondary batteries of each of the examples and comparative examples were produced, and the number of batteries in which the winding electrode body was not properly inserted in the manufacturing process was examined.
【００３０】そして、正常に巻回電極体の挿入がされて
完成した電池の中から、各実施例及び各比較例につい
て、それぞれ１０本ずつ抽出して、電池容量を測定し
た。なお、電池容量の測定は、直径１８ｍｍ，高さ６５
ｍｍの電池である実施例１，比較例１，比較例３の電池
については、充電電圧４．２０Ｖ，充電電流１０００ｍ
Ａ，充電時間２．５ｈで充電し、放電電流５００ｍＡ，
終止電圧２．７５Ｖで放電して測定した。また、直径２
６ｍｍ，高さ６５ｍｍの電池である実施例２，実施例
３，比較例２，比較例４の電池については、充電電圧
４．２０Ｖ，充電電流２０００ｍＡ，充電時間２．５ｈ
で充電し、放電電流１０００ｍＡ，終止電圧２．７５Ｖ
で放電して測定した。Then, 10 batteries were extracted for each of the examples and the comparative examples from the battery completed by inserting the wound electrode body normally, and the battery capacity was measured. The battery capacity was measured with a diameter of 18 mm and a height of 65 mm.
For the batteries of Example 1, Comparative Example 1, and Comparative Example 3, which are mm batteries, the charging voltage is 4.20 V and the charging current is 1000 m.
A, charging with 2.5h charging time, discharge current 500mA,
It was measured by discharging at a final voltage of 2.75V. Also, diameter 2
Regarding the batteries of Example 2, Example 3, Comparative Example 2 and Comparative Example 4, which are 6 mm and 65 mm in height, the charging voltage is 4.20 V, the charging current is 2000 mA, and the charging time is 2.5 h.
, Discharge current 1000mA, final voltage 2.75V
It was discharged and measured.
【００３１】その後、再び充電を行った上で、外部ショ
ート試験を行い、外部ショート時の電池の最高温度を調
べた。Then, after charging again, an external short-circuit test was conducted to examine the maximum temperature of the battery at the time of external short-circuit.
【００３２】以上の測定の結果を表１に示す。The results of the above measurements are shown in Table 1.
【００３３】[0033]
【表１】 [Table 1]
【００３４】この結果から、明らかなように、本実施例
の非水電解液二次電池は、巻回電極体の挿入不良が生じ
ることがない。そして、外部ショートが生じても電池の
温度上昇が少なく、最も温度が上昇した実施例２の非水
電解液二次電池であっても８５℃までしか上昇していな
い。As is clear from these results, in the non-aqueous electrolyte secondary battery of the present embodiment, defective insertion of the wound electrode body does not occur. Even if an external short circuit occurs, the temperature of the battery hardly rises, and even the temperature of the non-aqueous electrolyte secondary battery of Example 2, which has the highest temperature, rises to only 85 ° C.
【００３５】[0035]
【発明の効果】以上の説明から明らかなように、本発明
のように電池容量と負極リードの断面積の比を規定する
ことにより、外部ショート等が生じて大電流が流れて
も、あまり電池の温度が上昇することがない非水電解液
二次電池であって、その上、製造工程において巻回電極
体の挿入不良が発生しにくく生産性が高い非水電解液二
次電池を提供することができる。As is clear from the above description, by defining the ratio between the battery capacity and the cross-sectional area of the negative electrode lead as in the present invention, even if a large current flows due to an external short circuit or the like, the battery will not be much. A non-aqueous electrolyte secondary battery in which the temperature does not rise, and moreover, a high productivity of the non-aqueous electrolyte secondary battery in which insertion defects of the wound electrode body hardly occur in the manufacturing process are provided. be able to.
【図１】本発明を適用した非水電解液二次電池の一構成
例を示す概略断面図である。FIG. 1 is a schematic cross-sectional view showing a configuration example of a non-aqueous electrolyte secondary battery to which the present invention has been applied.
１ 負極 ２ 正極 ３ セパレータ ４ 絶縁板 ５ 電池缶 ６ 絶縁封口ガスケット ７ 電池蓋 ８ 安全弁装置 ９ 感熱電池遮断素子 １０ 負極集電体 １１ 正極集電体 １２ 負極リード １３ 正極リード 1 negative electrode 2 positive electrode 3 separator 4 insulating plate 5 battery cans 6 Insulation sealing gasket 7 Battery lid 8 Safety valve device 9 Thermal battery breaker 10 Negative electrode current collector 11 Positive electrode current collector 12 Negative electrode lead 13 Positive electrode lead
Claims (3)
し成型された帯状の正極および帯状の負極を、セパレー
ターを介して、多数回巻回された巻回電極体と、前記巻
回電極体を収納する電池容器と、非水電解液とを備え、 前記負極の端部には、１つのニッケル製の負極リードが
溶接され、かつ、前記ニッケル製の負極リードは、前記
電池容器に溶接されてなる非水電解液二次電池におい
て、 電池容量と前記負極リードの断面積の比が１．６Ａｈ／
ｍｍ２〜７．９Ａｈ／ｍｍ２であることを特徴とする非
水電解液二次電池。 The method according to claim 1] belt-like active material material mixture was applied on both sides of the current collector molded strip-shaped cathode and a strip-shaped anode, through the separator, and the spirally wound electrode body was wound many times, the roll
A battery container for housing the rotary electrode member, and a nonaqueous electrolyte, wherein the end portion of the negative electrode, one nickel negative electrode lead
Welded, and the nickel negative electrode lead, a non-aqueous electrolyte secondary battery smells made is welded to the battery container
And the ratio of the battery capacity to the cross-sectional area of the negative electrode lead is 1.6 Ah /
mm 2 to 7.9 Ah / mm 2 is a non-aqueous electrolyte secondary battery.
ドの一端が取り付けられ、前記正極リードの他の一端
は、前記巻回電極体と電池蓋との間に配設される安全弁
装置に溶接されてな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 positive electrodeAt the end ofIs a metal positive electrode
Of theOne end is attachedTheThe other end of the positive electrode lead
Is a safety valve disposed between the wound electrode body and the battery lid.
Welded to equipmentTo become a2. The method according to claim 1, wherein
Non-aqueous electrolyte secondary battery.
物を活物質として用い、前記負極には、炭素質材料を活
物質として用い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。 To wherein the positive electrode, a composite oxide containing lithium as an active material, wherein the negative electrode, active carbon material
Non-aqueous electrolyte secondary battery according to claim 1, wherein Rukoto used as material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06366094A JP3438301B2 (en) | 1994-03-31 | 1994-03-31 | Non-aqueous electrolyte secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06366094A JP3438301B2 (en) | 1994-03-31 | 1994-03-31 | Non-aqueous electrolyte secondary battery |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002321703A Division JP4007162B2 (en) | 2002-11-05 | 2002-11-05 | Non-aqueous electrolyte secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07272764A JPH07272764A (en) | 1995-10-20 |
| JP3438301B2 true JP3438301B2 (en) | 2003-08-18 |
Family
ID=13235728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06366094A Expired - Fee Related JP3438301B2 (en) | 1994-03-31 | 1994-03-31 | Non-aqueous electrolyte secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3438301B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3618219B2 (en) * | 1998-03-17 | 2005-02-09 | 旭化成エレクトロニクス株式会社 | Non-aqueous battery and electrode terminal |
| JP4260982B2 (en) * | 1999-05-10 | 2009-04-30 | 日東電工株式会社 | Non-aqueous electrolyte battery |
| JP2010009967A (en) * | 2008-06-27 | 2010-01-14 | Panasonic Corp | Non-aqueous electrolyte secondary battery |
| JP2010135170A (en) * | 2008-12-04 | 2010-06-17 | Hitachi Vehicle Energy Ltd | Lithium secondary battery, secondary battery module, and secondary battery pack |
| JP6147207B2 (en) * | 2014-02-27 | 2017-06-14 | 三洋電機株式会社 | Battery and battery manufacturing method |
| CN114628864B (en) * | 2022-05-12 | 2022-09-30 | 比亚迪股份有限公司 | Battery, battery pack and vehicle |
-
1994
- 1994-03-31 JP JP06366094A patent/JP3438301B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07272764A (en) | 1995-10-20 |
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