JPH1064511A - Winding electrode group and lithium secondary battery using this winding electrode group - Google Patents
Winding electrode group and lithium secondary battery using this winding electrode groupInfo
- Publication number
- JPH1064511A JPH1064511A JP8218960A JP21896096A JPH1064511A JP H1064511 A JPH1064511 A JP H1064511A JP 8218960 A JP8218960 A JP 8218960A JP 21896096 A JP21896096 A JP 21896096A JP H1064511 A JPH1064511 A JP H1064511A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- electrode group
- wound electrode
- current collecting
- center
- 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
-
- 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
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Cell Electrode Carriers And Collectors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複数の集電端子を
有する薄型電極を用いた捲回電極群に係り、特に放電容
量、出力密度が大でサイクル特性に優れたリチウム二次
電池用捲回電極群に関する。リチウム二次電池は、ポ−
タブル機器駆動用電源あるいは据置用機器駆動用電源に
応用される。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wound electrode group using a thin electrode having a plurality of current collecting terminals, and more particularly to a wound electrode for a lithium secondary battery having a large discharge capacity, a high output density and excellent cycle characteristics. For the electrode group. Lithium secondary batteries are
It is applied to a power supply for driving a tablet device or a stationary device.
【０００２】[0002]
【従来の技術】例えば、リチウム二次電池の負極とし
て、従来はリチウム金属およびリチウム合金が用いられ
てきたが、樹枝状リチウムの析出による両極の短絡やエ
ネルギ−密度が低くなるという欠点があった。最近では
これらの問題点を解決するために炭素材を負極に用いる
研究が活発である。リチウム二次電池では電極を薄型化
して捲回電極群とすることにより、電極面積を拡大して
電流密度の低さを補う方式を採用することが一般的で、
このような薄型電極を用いた方式では、電池の容量が小
さいときには捲回電極群の正負極の集電端子がそれぞれ
１本のみの構造となっている。例えば、特開平7-272764
号公報などにその実例が示されている。2. Description of the Related Art For example, lithium metal and lithium alloy have conventionally been used as a negative electrode of a lithium secondary battery. However, short-circuiting of both electrodes due to precipitation of dendritic lithium and a reduction in energy density are disadvantageous. . Recently, research on using a carbon material for a negative electrode to solve these problems has been actively conducted. In lithium secondary batteries, it is common to adopt a method in which the electrodes are thinned to form a wound electrode group, thereby increasing the electrode area to compensate for the low current density.
In the method using such thin electrodes, when the capacity of the battery is small, the wound electrode group has only one positive and negative current collecting terminals. For example, JP-A-7-272764
An actual example is shown in Japanese Patent Publication No.
【０００３】[0003]
【発明が解決しようとする課題】上記のように、薄型電
極を用いた捲回電極群によって構成されるリチウム二次
電池を大容量電池に適用するためには、集電端子を複数
化しないと電極全体からの集電が効果的にできず、出力
密度、放電容量およびサイクル特性が低下する。多端子
構造にするときに、例えばニッケル−カドミウム電池等
で従来用いられてきたプロジェクション構造は、薄型電
極には適用できない。また、端子部分の厚さが電極の活
物質塗布部分の厚さと異なるために、複数の集電端子の
位置が一部分に集中すると、捲回電極群が真円になりに
くいこと、大電流を通電するときに発熱が集中すること
などの問題があり、適切な集電端子の配置を設計する必
要がある。As described above, in order to apply a lithium secondary battery composed of a wound electrode group using thin electrodes to a large capacity battery, it is necessary to use a plurality of current collecting terminals. Current collection from the entire electrode cannot be effectively performed, and the output density, discharge capacity, and cycle characteristics decrease. When a multi-terminal structure is used, for example, a projection structure conventionally used for a nickel-cadmium battery or the like cannot be applied to a thin electrode. In addition, since the thickness of the terminal portion is different from the thickness of the active material applied portion of the electrode, if the positions of the plurality of current collecting terminals are concentrated on a part, the wound electrode group is unlikely to become a perfect circle, and a large current is applied. In such a case, there is a problem that heat is concentrated, and it is necessary to design an appropriate arrangement of current collecting terminals.
【０００４】[0004]
【課題を解決するための手段】本発明の要点は、長尺の
薄型電極を捲回した捲回電極群により、例えば大容量リ
チウム二次電池を構成する場合において、最適な集電端
子の配置に関する設計および製造技術を提供することに
ある。本発明の特徴は、捲回電極群において集電端子を
円周上の同一半径上に配置させず、少しづつズラしたこ
とにある。しかし、そのズレが大きくなったり、不規則
になったりすると、端子間の接続が長くあるいは複雑に
なり端子間接続の抵抗増加あるいは端子間接続が煩雑に
なるなどの問題が生ずるため、適切な端子配置を設定し
た。The gist of the present invention is that, for example, when a large-capacity lithium secondary battery is constituted by a wound electrode group formed by winding a long thin electrode, an optimum arrangement of current collecting terminals is provided. And to provide design and manufacturing techniques. A feature of the present invention is that the current collecting terminals are not arranged on the same radius on the circumference in the wound electrode group, but are slightly shifted. However, if the deviation is large or irregular, the connection between the terminals becomes long or complicated, which causes a problem such as an increase in resistance of the connection between the terminals or a complicated connection between the terminals. The arrangement has been set.
【０００５】まず、円の中心から外周部に向って捲回電
極群に配置されている複数の集電端子の捲回電極群の中
心からの距離がｎ番目の端子の一番近くに存在する端子
は、(ｎ＋１)番目または(ｎ−１)番目の端子であること
が必要である。そうであれば端子間接続の抵抗増加が抑
制でき、かつ端子間接続が容易になる。このことは少な
くとも一方の極性の集電端子群に関して満たされている
ことが望ましく、もちろん両極において満たされている
ことはなお望ましい。両極の集電端子群の相対的配置に
関しては、正負両極のそれぞれの極性の端子群が捲回電
極群の同一端面にある場合には、それぞれの端子群が半
円の面積内に収まって互いの半円が重複していないこと
が望ましい。そうすることにより正負両極の端子が接触
により短絡する可能性が少なくなり、かつ端子間を接続
する作業も容易になる。また、上記の場合にそれぞれの
端子群が半円の面積内に収まっていないときには、それ
ぞれの極性の端子を結ぶ軌跡が互いに点対称の位置にあ
れば、互いの端子群が接触して短絡する可能性が低くな
り、かつ端子間を接続する作業も容易になる。First, the distance from the center of the wound electrode group to a plurality of current collecting terminals arranged in the wound electrode group from the center of the circle toward the outer peripheral portion is closest to the n-th terminal. The terminal must be the (n + 1) th or (n-1) th terminal. In that case, the increase in the resistance of the connection between the terminals can be suppressed, and the connection between the terminals becomes easy. This is preferably fulfilled for at least one polarity of the current collecting terminal group, and it is more desirable for both polarities to be satisfied. Regarding the relative arrangement of the current collecting terminal groups of the both electrodes, when the terminal groups of the respective polarities of the positive and negative electrodes are on the same end face of the wound electrode group, the respective terminal groups fall within the area of a semicircle and are mutually separated. It is desirable that the semicircles do not overlap. By doing so, the possibility that the terminals of the positive and negative electrodes are short-circuited due to contact is reduced, and the work of connecting the terminals is also facilitated. In the above case, when each terminal group does not fall within the area of the semicircle, if the trajectories connecting the terminals of the respective polarities are at point-symmetric positions with each other, the terminal groups contact each other and short-circuit. Possibility is reduced, and the work of connecting the terminals is also facilitated.
【０００６】集電端子を溶接する部位は、電極の捲回方
向に対して平行方向の基体端部の活物質未塗布部分か、
電極の捲回方向に対して垂直方向の基体の活物質未塗布
部分がよい。集電端子の材料は電子伝導性があって、電
解液に対して化学的に安定でかつ電極の作動電位内で電
気化学的に安定である材料であればなんでも使用可能で
ある。電極基体と同一材料の銅、アルミニウム、ステン
レス鋼、ニッケル、チタンなどが実用的な端子材料とな
る。端子の溶接方法は溶接される材料に応じた方法を選
択すれば良いが、超音波溶接、抵抗溶接などが一般的で
ある。端子の溶接作業は捲回時に電極ロ−ルから電極を
引出して捲き取りる手前でするのが通常の方法であるが
本発明はこのことに制約されるものではない。The portion where the current collecting terminal is welded may be an active material-uncoated portion at the end of the base in a direction parallel to the winding direction of the electrode,
The active material-uncoated portion of the substrate in the direction perpendicular to the electrode winding direction is preferable. As the material of the current collecting terminal, any material can be used as long as it has electronic conductivity, is chemically stable with respect to the electrolytic solution, and is electrochemically stable within the operating potential of the electrode. Copper, aluminum, stainless steel, nickel, titanium and the like made of the same material as the electrode base are practical terminal materials. The method for welding the terminals may be selected according to the material to be welded, but ultrasonic welding, resistance welding and the like are generally used. The usual method of welding the terminal is to pull out the electrode from the electrode roll and wind it up at the time of winding, but the present invention is not limited to this.
【０００７】[0007]
【発明の実施の形態】本発明は、複数の集電端子を有す
る薄型電極を用いた捲回電極群であって、すべての集電
端子が捲回電極群の中心から伸びる同一直線上に並んで
おらず、かつ少なくとも一方の極性の集電端子に関して
捲回電極群の中心からの距離がｎ番目の端子の一番近く
に存在する端子は、(ｎ＋１)番目または(ｎ−１)番目の
端子であるように配置されていることを特徴とする。
（請求項１記載の発明） また、複数の集電端子を有する薄型電極を用いた捲回電
極群であって、すべての集電端子が捲回電極群の中心か
ら伸びる同一直線上に並んでおらず、かつ正負両極の極
性の集電端子に関して捲回電極群の中心からの距離がそ
れぞれｎ番目の端子の一番近くに存在する端子は、(ｎ
＋１)番目または(ｎ−１)番目の端子であるように配置
されており、かつ正負両極性の端子群が捲回電極群の同
一端面にありながらそれぞれの端子群が半円の面積内に
収まって互いの半円が重複していないことを特徴とす
る。（請求項２記載の発明） 更に、複数の集電端子を有する薄型電極を用いた捲回電
極群であって、すべての集電端子が捲回電極群の中心か
ら伸びる同一直線上に並んでおらず、かつ正負両極の極
性の端子に関して捲回電極群の中心からの距離がそれぞ
れｎ番目の端子の一番近くに存在する端子は、(ｎ＋１)
番目または(ｎ−１)番目の端子であるように配置されて
おり、かつ各極性の集電端子を結ぶ軌跡が互いに点対称
の位置にあることを特徴とする。（請求項３記載の発
明） 一方、複数の集電端子を有する捲回電極群を用いたリチ
ウム二次電池であり、すべての集電端子が捲回電極群の
中心から伸びる同一直線上に並んでおらず、かつ少なく
とも一方の極性の集電端子に関して捲回電極群の中心か
らの距離がｎ番目の端子の一番近くに存在する端子は、
(ｎ＋１)番目または(ｎ−１)番目の端子であるように配
置されていることを特徴とする。（請求項４記載の発
明） また、複数の集電端子を有する捲回電極群を用いたリチ
ウム二次電池であり、すべての集電端子が捲回電極群の
中心から伸びる同一直線上に並んでおらず、かつ正負両
極の極性の集電端子に関して捲回電極群の中心からの距
離がそれぞれｎ番目の端子の一番近くに存在する端子
は、(ｎ＋１)番目または(ｎ−１)番目の端子であるよう
に配置されており、かつ正負両極性の端子群が捲回電極
群の同一端面にありながらそれぞれの端子群が半円の面
積内に収まって互いの半円が重複していないことを特徴
とする。（請求項５記載の発明） 更に、複数の集電端子を有する捲回電極群を用いたリチ
ウム二次電池であり、すべての集電端子が捲回電極群の
中心から伸びる同一直線上に並んでおらず、かつ正負両
極の極性の端子に関して捲回電極群の中心からの距離が
それぞれｎ番目の端子の一番近くに存在する端子は、
(ｎ＋１)番目または(ｎ−１)番目の端子であるように配
置されており、かつ各極性の集電端子を結ぶ軌跡が互い
に点対称の位置にあることを特徴とする。（請求項６記
載の発明）DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention relates to a wound electrode group using a thin electrode having a plurality of current collecting terminals, wherein all the current collecting terminals are arranged on the same straight line extending from the center of the wound electrode group. And the terminal located at the closest distance from the center of the wound electrode group to the n-th terminal with respect to the current collecting terminal of at least one polarity is the (n + 1) -th or (n-1) -th terminal It is characterized by being arranged to be a terminal.
(Invention of Claim 1) A wound electrode group using a thin electrode having a plurality of current collecting terminals, wherein all the current collecting terminals are arranged on the same straight line extending from the center of the wound electrode group. Terminals that are not present and whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the current collecting terminals having both positive and negative polarities are (n
+1) -th or (n-1) -th terminal, and each terminal group is within the area of a semicircle while the terminal groups of both positive and negative polarities are on the same end face of the wound electrode group. It is characterized in that the semicircles do not overlap each other. (Invention of Claim 2) Further, a wound electrode group using a thin electrode having a plurality of current collecting terminals, wherein all the current collecting terminals are arranged on the same straight line extending from the center of the wound electrode group. The terminals which are not present and whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the terminals having both positive and negative polarities are (n + 1)
Or (n-1) th terminal, and the trajectories connecting the current collecting terminals of the respective polarities are located at point-symmetric positions with respect to each other. (Invention of Claim 3) On the other hand, a lithium secondary battery using a wound electrode group having a plurality of current collecting terminals, wherein all current collecting terminals are arranged on the same straight line extending from the center of the wound electrode group. Not, and a terminal whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the current collecting terminal of at least one polarity,
It is characterized by being arranged so as to be the (n + 1) th or (n-1) th terminal. (Invention of Claim 4) A lithium secondary battery using a wound electrode group having a plurality of current collecting terminals, wherein all current collecting terminals are arranged on the same straight line extending from the center of the wound electrode group. In addition, the terminals whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the current collecting terminals having both positive and negative polarities are the (n + 1) -th and (n-1) -th terminals, respectively. And the terminal groups of both the positive and negative polarities are located on the same end face of the wound electrode group, but each terminal group fits within the area of the semicircle, and the semicircles overlap each other. It is characterized by not having. (Invention of claim 5) Further, the present invention is a lithium secondary battery using a wound electrode group having a plurality of current collecting terminals, wherein all current collecting terminals are arranged on the same straight line extending from the center of the wound electrode group. In addition, a terminal whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the terminal having both the positive and negative polarities is
They are arranged so as to be the (n + 1) -th or (n-1) -th terminals, and the trajectories connecting the current collecting terminals of the respective polarities are point-symmetric with respect to each other. (Invention of claim 6)
【０００８】[0008]
実施例１ 本発明を炭素／コバルト酸リチウムから構成される捲回
式円筒形リチウム二次電池において実施した。用いた電
池の外寸は外径64mm、長さ220mmである。 負極電極基体
には厚さ20μmの銅箔を、正極電極基体には厚さ15μmの
アルミニウム箔をそれぞれ用いた。溶媒のＮ−メチルピ
ロリドン(ＮＭＰ)と、結着材のポリフッ化ビニリデン
(ＰＶＤＦ)を含む人造黒鉛粉末のスラリ−を塗布して負
極を作製した。 正極は、コバルト酸リチウム(ＬiＣoＯ
2)、導電剤の人造黒鉛粉末、結着材のＰＶＤＦ、および
溶媒のＮＭＰからなるのスラリ−を塗布して作製した。
得られた乾燥状態の電極をさらにカレンダ−ロ−ルによ
り成型し、所定の寸法に切断してロ−ルに捲き取った。
裁断された電極に集電端子を溶接しながら、セパレ−タ
(厚さ25μmのポリエチレン微孔膜) を挾んで捲回し電極
群を得た。このときの集電端子の配置は、捲回電極群２
の上面図としての図２に示すように、捲回電極群２の中
心３からｎ番目の端子の一番近くに存在する端子が(ｎ
＋１)番目または(ｎ−１)番目の端子であるようにし
た。図２に示してあるのは正極端子４群のみであるの
は、本実施例では円筒形の捲回電極群２の両端に正負そ
れぞれの集電端子群を取り出す方式のためである。Example 1 The present invention was implemented in a wound cylindrical lithium secondary battery composed of carbon / lithium cobaltate. The outer dimensions of the battery used were 64 mm in outer diameter and 220 mm in length. A copper foil having a thickness of 20 μm was used for the negative electrode substrate, and an aluminum foil having a thickness of 15 μm was used for the positive electrode substrate. N-methylpyrrolidone (NMP) as a solvent and polyvinylidene fluoride as a binder
A slurry of artificial graphite powder containing (PVDF) was applied to prepare a negative electrode. The positive electrode is made of lithium cobalt oxide (LiCoO
2 ) A slurry made of artificial graphite powder as a conductive agent, PVDF as a binder, and NMP as a solvent was applied.
The obtained electrode in a dry state was further molded by a calendar roll, cut into a predetermined size, and wound up on a roll.
While welding the current collecting terminal to the cut electrode, the separator
(A 25 μm thick polyethylene microporous membrane) was wound therebetween to obtain an electrode group. At this time, the arrangement of the current collecting terminals is the same as that of the wound electrode group 2
As shown in FIG. 2 as a top view of FIG. 2, the terminal located closest to the n-th terminal from the center 3 of the wound electrode group 2 is (n
+1) -th or (n-1) -th terminal. FIG. 2 shows only the positive electrode terminal group 4 because of the method of taking out the positive and negative current collecting terminal groups at both ends of the cylindrical wound electrode group 2 in this embodiment.
【０００９】得られた捲回電極群２を電池容器１に収納
し、正極端子４を、蓋に設けた電池極柱に溶接後、電解
液を所定量注入し、封口した。電解液は、カ−ボネ−ト
系の混合溶媒にＬiＰＦ6を１mol/ｌの濃度になるように
溶解したものである。得られた電池の充填容量は、56.8
Ahであった。充放電速度は0.5CmAとし、4.2Ｖから2.8Ｖ
の電圧範囲で充放電サイクル試験をした。なお、充放電
後の休止時間は、それぞれ１時間とした。得られた放電
容量は55.0Ａｈであり、このときの体積エネルギ−密度
は281Ｗｈ／ｌとなった。The obtained wound electrode group 2 was housed in a battery container 1, and the positive electrode terminal 4 was welded to a battery pole provided on a lid, and a predetermined amount of electrolyte was injected and sealed. The electrolytic solution was obtained by dissolving LiPF6 in a carbonate-based mixed solvent to a concentration of 1 mol / l. The filling capacity of the obtained battery was 56.8
Ah. Charge / discharge speed is 0.5CmA, 4.2V to 2.8V
A charge / discharge cycle test was performed in the voltage range of FIG. In addition, the rest time after charge / discharge was set to 1 hour. The obtained discharge capacity was 55.0 Ah, and the volume energy density at this time was 281 Wh / l.
【００１０】実施例２ 実施例１と同様に、炭素／コバルト酸リチウムで構成さ
れる外径64mm、長さ220mmの外寸を有する捲回式円筒形
リチウム二次電池において実施した。ただし、このとき
の集電端子群の配置は実施例１とは異なる。その配置を
図１に示す。正極端子４と負極端子５に関して、捲回電
極群２の中心からの距離がそれぞれｎ番目の端子の一番
近くに存在する端子が(ｎ＋１)番目または(ｎ−１)番目
の端子であり、かつ正負両極性の端子群が捲回電極群２
の同一端面にありながらそれぞれの端子群が半円の面積
内に収まって互いの半円が重複していないようにした。
得られた捲回電極群２を上記実施例１と同様に密閉型円
筒形電池とし、容量試験をした。電池の充填容量は、6
1.6Ahに対して、放電容量は60.3Ａｈであり、このとき
の体積エネルギ−密度は308Ｗｈ／ｌとなった。Example 2 In the same manner as in Example 1, the operation was carried out on a wound cylindrical lithium secondary battery having an outer diameter of 64 mm and an outer length of 220 mm composed of carbon / lithium cobaltate. However, the arrangement of the current collecting terminal group at this time is different from that of the first embodiment. The arrangement is shown in FIG. With respect to the positive electrode terminal 4 and the negative electrode terminal 5, the terminal located closest to the n-th terminal at a distance from the center of the wound electrode group 2 is the (n + 1) -th or (n-1) -th terminal, And a terminal group of both positive and negative polarity is a wound electrode group 2
, Each terminal group fits within the area of a semicircle so that the semicircles do not overlap with each other.
The obtained wound electrode group 2 was made into a sealed cylindrical battery in the same manner as in Example 1, and a capacity test was performed. The filling capacity of the battery is 6
The discharge capacity was 60.3 Ah with respect to 1.6 Ah, and the volume energy density at this time was 308 Wh / l.
【００１１】実施例３ 実施例１と同様に、炭素／コバルト酸リチウムで構成さ
れる外径64mm、長さ220mmの外寸を有する捲回式円筒形
リチウム二次電池において実施した。ただし、このとき
の集電端子群の配置は実施例１とは異なる。その配置を
図３に示す。正極端子４と負極端子５に関して、捲回電
極群２の中心からの距離がそれぞれｎ番目の端子の一番
近くに存在する端子が(ｎ＋１)番目または(ｎ−１)番目
の端子であり、かつそれぞれの極性の端子を結ぶ軌跡が
互いに点対称の位置にあるようにした。得られた捲回電
極群を上記実施例１と同様に密閉型円筒形電池とし、容
量試験をした。電池の充填容量は、61.0Ahに対して、放
電容量は59.8Ａｈであり、このときの体積エネルギ−密
度は305Ｗｈ／ｌとなった。Example 3 In the same manner as in Example 1, the operation was carried out on a wound cylindrical lithium secondary battery composed of carbon / lithium cobaltate and having an outer diameter of 64 mm and a length of 220 mm. However, the arrangement of the current collecting terminal group at this time is different from that of the first embodiment. The arrangement is shown in FIG. With respect to the positive electrode terminal 4 and the negative electrode terminal 5, the terminal located closest to the n-th terminal at a distance from the center of the wound electrode group 2 is the (n + 1) -th or (n-1) -th terminal, In addition, the trajectories connecting the terminals of the respective polarities are point-symmetric with each other. The obtained wound electrode group was made into a sealed cylindrical battery in the same manner as in Example 1, and a capacity test was performed. The charging capacity of the battery was 61.0 Ah, the discharge capacity was 59.8 Ah, and the volume energy density at this time was 305 Wh / l.
【００１２】比較例 実施例１と同様に、炭素／コバルト酸リチウムで構成さ
れる外径64mm、長さ220mmの外寸を有する捲回式円筒形
リチウム二次電池において実施した。ただし、このとき
の集電端子群の配置は実施例１とは異なる。その配置を
図４に示す。正極端子４と負極端子５に関して、捲回電
極群２の中心から伸びる同一半径上に揃った配置となっ
ている。得られた捲回電極群を上記実施例１と同様に密
閉型円筒形電池とし、容量試験をした。電池の充填容量
は、52.9Ahに対して、放電容量は50.4Ａｈであり、この
ときの体積エネルギ−密度は257Ｗｈ／ｌとなった。Comparative Example As in Example 1, the operation was carried out on a wound cylindrical lithium secondary battery having an outer diameter of 64 mm and an outer length of 220 mm composed of carbon / lithium cobaltate. However, the arrangement of the current collecting terminal group at this time is different from that of the first embodiment. The arrangement is shown in FIG. The positive electrode terminal 4 and the negative electrode terminal 5 are arranged on the same radius extending from the center of the wound electrode group 2. The obtained wound electrode group was made into a sealed cylindrical battery in the same manner as in Example 1, and a capacity test was performed. The charging capacity of the battery was 52.9 Ah, and the discharging capacity was 50.4 Ah, and the volume energy density at this time was 257 Wh / l.
【００１３】[0013]
【発明の効果】上述したように、本発明により得られた
捲回電極群及びそれを用いたリチウム二次電池は、集電
端子の位置が一ヶ所に集中しないため、捲回電極群の断
面がより真円に近くなり、充填容量が増加した。また、
そのときの端子間接続距離が短くなるようにしたため抵
抗の増加が抑制された。その結果、コンパクトな捲回電
極群が形成可能となり、一定体積の中により多くの容量
の充填が可能となり、放電容量も増加し、体積エネルギ
−密度の向上が可能となった。As described above, in the wound electrode group obtained according to the present invention and the lithium secondary battery using the same, the positions of the current collecting terminals are not concentrated in one place, so that the cross section of the wound electrode group Became closer to a perfect circle, and the filling capacity increased. Also,
Since the connection distance between the terminals at that time was shortened, an increase in resistance was suppressed. As a result, a compact wound electrode group can be formed, more capacity can be filled in a fixed volume, the discharge capacity can be increased, and the volume energy density can be improved.
【図１】本発明の実施例を示す捲回電極群の上面図であ
る。FIG. 1 is a top view of a wound electrode group showing an embodiment of the present invention.
【図２】本発明の他の実施例を示す捲回電極群の上面図
である。FIG. 2 is a top view of a wound electrode group showing another embodiment of the present invention.
【図３】本発明の他の実施例を示す捲回電極群の上面図
である。FIG. 3 is a top view of a wound electrode group showing another embodiment of the present invention.
【図４】比較例として実施した捲回電極群の上面図であ
る。FIG. 4 is a top view of a wound electrode group implemented as a comparative example.
１は電池容器、２は捲回電極群、３は捲回電極群の中
心、４は正極端子、５は負極端子1 is a battery container, 2 is a wound electrode group, 3 is the center of the wound electrode group, 4 is a positive electrode terminal, and 5 is a negative electrode terminal.
Claims (6)
捲回電極群であり、すべての集電端子が捲回電極群の中
心から伸びる同一直線上に並んでおらず、かつ少なくと
も一方の極性の集電端子に関して捲回電極群の中心から
の距離がｎ番目の端子の一番近くに存在する端子は、
(ｎ＋１)番目または(ｎ−１)番目の端子であるように配
置されていることを特徴とする捲回電極群。1. A wound electrode group using a thin electrode having a plurality of current collecting terminals, wherein all the current collecting terminals are not arranged on the same straight line extending from the center of the wound electrode group, and at least one of the current collecting terminals is not aligned. The terminal whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the current collecting terminal having a polarity of
A wound electrode group arranged so as to be the (n + 1) th or (n-1) th terminal.
捲回電極群であり、すべての集電端子が捲回電極群の中
心から伸びる同一直線上に並んでおらず、かつ正負両極
の極性の集電端子に関して捲回電極群の中心からの距離
がそれぞれｎ番目の端子の一番近くに存在する端子は、
(ｎ＋１)番目または(ｎ−１)番目の端子であるように配
置されており、かつ正負両極性の端子群が捲回電極群の
同一端面にありながらそれぞれの端子群が半円の面積内
に収まって互いの半円が重複していないことを特徴とす
る捲回電極群。2. A wound electrode group using a thin electrode having a plurality of current collecting terminals, wherein not all current collecting terminals are arranged on the same straight line extending from the center of the wound electrode group, and both positive and negative electrodes are provided. The terminal whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the current collecting terminal having a polarity of
(n + 1) -th or (n-1) -th terminal is arranged, and each terminal group is within the area of a semicircle while the terminal groups of both positive and negative polarities are on the same end face of the wound electrode group. And a semicircle that does not overlap each other.
捲回電極群であり、すべての集電端子が捲回電極群の中
心から伸びる同一直線上に並んでおらず、かつ正負両極
の極性の端子に関して捲回電極群の中心からの距離がそ
れぞれｎ番目の端子の一番近くに存在する端子は、(ｎ
＋１)番目または(ｎ−１)番目の端子であるように配置
されており、かつ各極性の集電端子を結ぶ軌跡が互いに
点対称の位置にあることを特徴とする捲回電極群。3. A wound electrode group using a thin electrode having a plurality of current collecting terminals, wherein all the current collecting terminals are not arranged on the same straight line extending from the center of the wound electrode group, and both positive and negative electrodes are provided. The terminal whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the terminal having the polarity of (n) is (n
A wound electrode group which is arranged so as to be the (+1) th or (n-1) th terminal, and whose trajectories connecting the current collecting terminals of the respective polarities are point-symmetrical to each other.
たリチウム二次電池であって、すべての集電端子が捲回
電極群の中心から伸びる同一直線上に並んでおらず、か
つ少なくとも一方の極性の集電端子に関して捲回電極群
の中心からの距離がｎ番目の端子の一番近くに存在する
端子は、(ｎ＋１)番目または(ｎ−１)番目の端子である
ように配置されていることを特徴とするリチウム二次電
池。4. A lithium secondary battery using a wound electrode group having a plurality of current collecting terminals, wherein all current collecting terminals are not arranged on the same straight line extending from the center of the wound electrode group. The terminal whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the current collecting terminal of at least one polarity is the (n + 1) -th or (n-1) -th terminal. A rechargeable lithium battery, wherein
たリチウム二次電池であって、すべての集電端子が捲回
電極群の中心から伸びる同一直線上に並んでおらず、か
つ正負両極の極性の集電端子に関して捲回電極群の中心
からの距離がそれぞれｎ番目の端子の一番近くに存在す
る端子は、(ｎ＋１)番目または(ｎ−１)番目の端子であ
るように配置されており、かつ正負両極性の端子群が捲
回電極群の同一端面にありながらそれぞれの端子群が半
円の面積内に収まって互いの半円が重複していないこと
を特徴とするリチウム二次電池。5. A lithium secondary battery using a wound electrode group having a plurality of current collecting terminals, wherein all current collecting terminals are not arranged on the same straight line extending from the center of the wound electrode group. The terminal whose distance from the center of the wound electrode group is closest to the n-th terminal with respect to the current collecting terminals having both positive and negative polarities is the (n + 1) -th or (n-1) -th terminal. Are arranged in such a manner that the terminal groups of both positive and negative polarities are located on the same end face of the wound electrode group, but each terminal group fits within the area of a semicircle and the semicircles do not overlap each other. Lithium secondary battery.
たリチウム二次電池であって、すべての集電端子が捲回
電極群の中心から伸びる同一直線上に並んでおらず、か
つ正負両極の極性の端子に関して捲回電極群の中心から
の距離がそれぞれｎ番目の端子の一番近くに存在する端
子は、(ｎ＋１)番目または(ｎ−１)番目の端子であるよ
うに配置されており、かつ各極性の集電端子を結ぶ軌跡
が互いに点対称の位置にあることを特徴とするリチウム
二次電池。6. A lithium secondary battery using a wound electrode group having a plurality of current collecting terminals, wherein all current collecting terminals are not arranged on the same straight line extending from the center of the wound electrode group. In addition, the terminal having the distance from the center of the wound electrode group closest to the n-th terminal with respect to the terminals having both the positive and negative polarities is the (n + 1) -th terminal or the (n-1) -th terminal. A lithium secondary battery, wherein the trajectories connecting the current collecting terminals of the respective polarities are arranged at point-symmetric positions with respect to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21896096A JP3674171B2 (en) | 1996-08-20 | 1996-08-20 | Winding electrode group and lithium secondary battery using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21896096A JP3674171B2 (en) | 1996-08-20 | 1996-08-20 | Winding electrode group and lithium secondary battery using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1064511A true JPH1064511A (en) | 1998-03-06 |
| JP3674171B2 JP3674171B2 (en) | 2005-07-20 |
Family
ID=16728052
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21896096A Expired - Fee Related JP3674171B2 (en) | 1996-08-20 | 1996-08-20 | Winding electrode group and lithium secondary battery using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3674171B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009060564A1 (en) * | 2007-11-05 | 2009-05-14 | Panasonic Corporation | Secondary cell and its manufacturing method |
| JP2009129553A (en) * | 2007-11-20 | 2009-06-11 | Sony Corp | Battery |
| GB2564670A (en) * | 2017-07-18 | 2019-01-23 | Dyson Technology Ltd | Energy storage device |
| WO2023047757A1 (en) * | 2021-09-27 | 2023-03-30 | パナソニックＩｐマネジメント株式会社 | Cylindrical battery |
-
1996
- 1996-08-20 JP JP21896096A patent/JP3674171B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009060564A1 (en) * | 2007-11-05 | 2009-05-14 | Panasonic Corporation | Secondary cell and its manufacturing method |
| JP2009117092A (en) * | 2007-11-05 | 2009-05-28 | Panasonic Corp | Secondary battery and its manufacturing method |
| US8354187B2 (en) | 2007-11-05 | 2013-01-15 | Panasonic Corporation | Secondary battery and method for producing the same |
| JP2009129553A (en) * | 2007-11-20 | 2009-06-11 | Sony Corp | Battery |
| GB2564670A (en) * | 2017-07-18 | 2019-01-23 | Dyson Technology Ltd | Energy storage device |
| CN110870099A (en) * | 2017-07-18 | 2020-03-06 | 戴森技术有限公司 | Energy storage device |
| GB2564670B (en) * | 2017-07-18 | 2020-08-19 | Dyson Technology Ltd | Electrochemical energy storage device |
| JP2020527841A (en) * | 2017-07-18 | 2020-09-10 | ダイソン・テクノロジー・リミテッド | Energy storage device |
| CN110870099B (en) * | 2017-07-18 | 2023-05-12 | 戴森技术有限公司 | Energy storage device |
| WO2023047757A1 (en) * | 2021-09-27 | 2023-03-30 | パナソニックＩｐマネジメント株式会社 | Cylindrical battery |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3674171B2 (en) | 2005-07-20 |
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