JP3525170B2 - Battery with non-circular spiral electrode body - Google Patents
Battery with non-circular spiral electrode bodyInfo
- Publication number
- JP3525170B2 JP3525170B2 JP14436695A JP14436695A JP3525170B2 JP 3525170 B2 JP3525170 B2 JP 3525170B2 JP 14436695 A JP14436695 A JP 14436695A JP 14436695 A JP14436695 A JP 14436695A JP 3525170 B2 JP3525170 B2 JP 3525170B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode plate
- battery
- winding
- circular spiral
- wound
- 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
-
- 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)
- Primary Cells (AREA)
- Cell Electrode Carriers And Collectors (AREA)
- Cell Separators (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、＋−の極板を非円形の
スパイラル状に巻いている電極群の電池に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery of an electrode group in which positive and negative electrode plates are wound in a non-circular spiral shape.
【０００２】[0002]
【従来の技術】極板をスパイラル状に巻いた電極体を内
蔵する角形電池は、電極体を非円形のスパイラルとする
必要がある。非円形スパイラル電極体を製造する方法は
二つある。第１の方法は、＋−の極板をセパレータで絶
縁しながら円形のスパイラル状に巻いた後、両側から押
圧して非円形に成形する方法である。第２の方法は、＋
−の極板をセパレータで絶縁しながら非円形のスパイラ
ル状に巻く方法である。このようにして製造された非円
形スパイラル電極体の断面図を図１に示す。2. Description of the Related Art A prismatic battery containing an electrode body in which an electrode plate is spirally wound requires that the electrode body be a non-circular spiral. There are two methods for manufacturing the non-circular spiral electrode body. The first method is a method of winding a + -electrode plate in a circular spiral shape while insulating it with a separator, and then pressing from both sides to form a non-circular shape. The second method is +
It is a method of winding a negative electrode plate in a non-circular spiral shape while insulating it with a separator. A cross-sectional view of the non-circular spiral electrode body manufactured in this way is shown in FIG.
【０００３】[0003]
【発明が解決しようとする課題】図１に示す構造の非円
形スパイラル電極体は、矢印Ａで示す最初の折曲部で、
＋−の極板をショートさせ、あるいは絶縁性を低下させ
る欠点がある。それは、最も中心に近い極板の最初の折
曲部で、極板が極めて小さい曲率半径で折曲されるから
である。小さい曲率半径で折曲される極板は、鋭いエッ
ジができてセパレータを損傷させる。セパレータを厚く
することは、この弊害を防止することに効果がある。た
だ、セパレータに厚いものを使用すると、電池の容量が
減少する欠点がある。外装缶の内部でセパレータの占め
る容積が大きくなって、極板の容積を減少させるからで
ある。セパレータの空隙率を少なくすることも、前記の
弊害を防止する効果がある。しかしながら、セパレータ
の空隙率を少なくすると、イオンの透過率が低下して電
池性能を低下させる。最初の折曲部の曲率半径を大きく
することも、前記の弊害を防止することに効果がある
が、この構造にするとスパイラル電極の中心に空隙がで
きることになって、電池容量を減少する。The non-circular spiral electrode body having the structure shown in FIG. 1 has a first bent portion indicated by an arrow A,
There is a drawback that the + -electrode plates are short-circuited or the insulation is deteriorated. This is because the plate is bent with an extremely small radius of curvature at the first bent portion of the plate that is closest to the center. A plate bent with a small radius of curvature creates a sharp edge and damages the separator. Making the separator thick is effective in preventing this adverse effect. However, if a thick separator is used, the capacity of the battery will decrease. This is because the volume occupied by the separator inside the outer can increases and the volume of the electrode plate decreases. Reducing the porosity of the separator also has the effect of preventing the above-mentioned adverse effects. However, if the porosity of the separator is reduced, the ion permeability is reduced and the battery performance is reduced. Increasing the radius of curvature of the first bent portion is also effective in preventing the above-mentioned adverse effects, but with this structure, a void is formed at the center of the spiral electrode, and the battery capacity is reduced.
【０００４】本発明は、この欠点を解決することを目的
に開発されたもので、本発明の重要な目的は、非円形ス
パイラル電極体の最も中心に近い最初の折曲部のショー
トと絶縁不良を有効に防止できる非円形スパイラル電極
体の電池を提供することにある。The present invention was developed with the object of resolving this drawback. An important object of the present invention is to short-circuit the first bent portion near the center of the non-circular spiral electrode body and to prevent insulation failure. Another object of the present invention is to provide a battery having a non-circular spiral electrode body that can effectively prevent
【０００５】[0005]
【課題を解決するための手段】本発明の電池は、前述の
目的を達成するために下記の構成を備える。電池はスパ
イラル電極を内蔵し、スパイラル電極は、正極板２Ａと
負極板２Ｂとがセパレータ２Ｃを介して非円形のスパイ
ラル状に巻かれている。さらに、本発明の電池は、＋−
の極板は巻き始め位置がずれており、最も中心に近い極
板の折曲部には先巻極板３のみが位置する。後巻極板４
の巻き始め位置は、先巻極板３の最初の折曲部よりも後
退して位置している。先巻極板３の最初の折曲部は、そ
の外側に巻かれている先巻極板３に対向している。いい
かえると、先巻極板３の最初の折曲部は後巻極板４に対
向していない。The battery of the present invention has the following constitution in order to achieve the above-mentioned object. The battery contains a spiral electrode, and the spiral electrode has a positive electrode plate 2A and a negative electrode plate 2B wound in a non-circular spiral shape with a separator 2C interposed therebetween. Furthermore, the battery of the present invention is +-
The winding start position of the electrode plate is deviated, and only the first winding electrode plate 3 is positioned at the bent portion of the electrode plate closest to the center. Rear roll electrode plate 4
The winding start position of is located rearward of the first bent portion of the first-winding electrode plate 3. The first bent portion of the pre-wound electrode plate 3 faces the pre-wound electrode plate 3 wound on the outside thereof. In other words, the first bent portion of the first winding electrode plate 3 does not face the second winding electrode plate 4.
【０００６】本明細書において先巻極板３とは、先にス
パイラル状に巻き始められる極板である。後巻極板４と
は、この先巻極板３に続いて後からスパイラル状に巻か
れる極板である。In the present specification, the pre-wound electrode plate 3 is an electrode plate which is first wound in a spiral shape. The post-wound electrode plate 4 is an electrode plate that is wound after the pre-wound electrode plate 3 in a spiral shape afterwards.
【０００７】[0007]
【作用】図３の断面図は、本発明の好ましい実施例の電
池に内蔵される非円形スパイラル電極体２を示す。この
図の非円形スパイラル電極体２は、従来の電極体と、矢
印Ｂで示す部分の構造が違う。矢印Ｂで示す、電極体の
最も中心に近い極板の折曲部は、先巻極板３のみがあっ
て後巻極板４はない。この折曲部において、先巻極板３
がセパレータ２Ｃを介して対向し、従来の電極体の矢印
Ａで示すように、先巻極板３と後巻極板４とが対向しな
い。極板の折曲部で、先巻極板３と後巻極板４とが対向
していると、セパレータ２Ｃが損傷されると先巻極板３
と後巻極板４とがショートしたり、あるいは絶縁が悪く
なる。本発明の電池は、図１に示すように、先巻極板３
がセパレータ２Ｃを介して対向しているので、最も中心
に近い曲率半径の小さい折曲部で先巻極板３がセパレー
タ２Ｃを損傷させて互いに接触しても、＋−の極板がシ
ョートしたり絶縁不良となることはない。同極の先巻極
板３が接触するからである。The sectional view of FIG. 3 shows the non-circular spiral electrode body 2 incorporated in the battery of the preferred embodiment of the present invention. The non-circular spiral electrode body 2 in this figure is different from the conventional electrode body in the structure of the portion indicated by arrow B. The bent portion of the electrode plate, which is indicated by the arrow B and is closest to the center of the electrode body, has only the first winding electrode plate 3 and not the second winding electrode plate 4. At this bent portion, the first winding electrode plate 3
Are opposed to each other via the separator 2C, and the pre-wound electrode plate 3 and the post-wound electrode plate 4 do not face each other as indicated by an arrow A of the conventional electrode body. When the first winding electrode plate 3 and the second winding electrode plate 4 face each other at the bent portion of the electrode plate, the first winding electrode plate 3 is damaged when the separator 2C is damaged.
And the post-winding electrode plate 4 are short-circuited or the insulation is poor. The battery of the present invention, as shown in FIG.
Are opposed to each other via the separator 2C, even if the pre-wound electrode plate 3 damages the separator 2C and makes contact with each other at the bent portion with the smallest radius of curvature closest to the center, the + and-electrode plates are short-circuited. It does not cause insulation failure. This is because the pre-wound pole plate 3 of the same pole contacts.
【０００８】[0008]
【実施例】以下、本発明の実施例を図面に基づいて説明
する。ただし、以下に示す実施例は、本発明の技術思想
を具体化するための電池を例示するものであって、本発
明は電池を下記のものに特定しない。Embodiments of the present invention will be described below with reference to the drawings. However, the examples described below exemplify a battery for embodying the technical idea of the present invention, and the present invention does not specify the battery as follows.
【０００９】さらに、この明細書は、特許請求の範囲を
理解し易いように、実施例に示される部材に対応する番
号を、「特許請求の範囲の欄」、「作用の欄」、および
「課題を解決するための手段の欄」に示される部材に付
記している。ただ、特許請求の範囲に示される部材を、
実施例の部材に特定するものでは決してない。Further, in this specification, for easier understanding of the claims, the numbers corresponding to the members shown in the embodiments are referred to as "claims column", "action column", and "action column". It is added to the members shown in the section of "Means for Solving the Problems". However, the members shown in the claims are
It is by no means specific to the members of the examples.
【００１０】図２に示す電池は、非円形スパイラル電極
体を内蔵するリチウムイオン二次電池である。ただし、
本発明は電池をリチウムイオン二次電池に特定しない。
電池は、ニッケル−カドミウム電池やニッケル−水素電
池とすることもできる。これ等の図に示す電池は、密閉
形の角形電池である。電池は、アルミニウム、または、
アルミニウム合金の外装缶１に非円形スパイラル電極体
２を内蔵している。非円形スパイラル電極体２は、負極
板２Ｂを先巻極板３とし、正極板２Ａを後巻極板４とし
ている。外装缶１を正極とするためである。ただ、図示
しないが、非円形スパイラル電極体は、正極板２Ａを先
巻極板３とし、負極板２Ｂを後巻極板４とすることもで
きる。The battery shown in FIG. 2 is a lithium ion secondary battery containing a non-circular spiral electrode body. However,
The present invention does not specify the battery as a lithium ion secondary battery.
The battery can also be a nickel-cadmium battery or a nickel-hydrogen battery. The battery shown in these figures is a sealed prismatic battery. The battery is aluminum or
A non-circular spiral electrode body 2 is built in an aluminum alloy outer can 1. The non-circular spiral electrode body 2 uses the negative electrode plate 2B as the pre-wound electrode plate 3 and the positive electrode plate 2A as the post-wound electrode plate 4. This is because the outer can 1 is used as the positive electrode. However, although not shown, in the non-circular spiral electrode body, the positive electrode plate 2A can be the first winding electrode plate 3 and the negative electrode plate 2B can be the second winding electrode plate 4.
【００１１】外装缶１は、外側の寸法で高さを４８ｍ
ｍ、幅を２２ｍｍ、厚さを８．１ｍｍとし、アルミニウ
ム製外装缶１の肉厚を０．５ｍｍとした。ただ、本発明
は電池の外装缶１の形状、大きさ、材質、肉厚を特定し
ない。外装缶１は、鉄あるいは鉄合金製とすることもで
きる。The outer can 1 has an outer dimension and a height of 48 m.
m, the width was 22 mm, the thickness was 8.1 mm, and the thickness of the aluminum outer can 1 was 0.5 mm. However, the present invention does not specify the shape, size, material, and wall thickness of the battery outer can 1. The outer can 1 may be made of iron or iron alloy.
【００１２】外装缶１は開口部を封口板５で気密に閉塞
している。封口板５は、外周を外装缶１の内面にレーザ
ー溶接等の方法で溶着して固定されている。封口板５は
上面に突出する負極端子６を有する。負極端子６は絶縁
パッキンで絶縁して封口板５に気密状態に固定されてい
る。負極端子６は、封口板５の下面に固定されている集
電端子に接続されている。集電端子と封口板５の間には
絶縁板が挟着され、絶縁板は集電端子を封口板５から絶
縁している。集電端子は図３に示す非円形スパイラル電
極体２の負極タブ７に接続されている。非円形スパイラ
ル電極体２の先巻極板３である負極板２Ｂは、負極タブ
７と集電端子とを介して負極端子に接続される。The outer can 1 has an opening hermetically closed by a sealing plate 5. The sealing plate 5 has its outer periphery welded and fixed to the inner surface of the outer can 1 by a method such as laser welding. The sealing plate 5 has a negative electrode terminal 6 protruding on the upper surface. The negative electrode terminal 6 is insulated by an insulating packing and fixed to the sealing plate 5 in an airtight state. The negative electrode terminal 6 is connected to a current collecting terminal fixed to the lower surface of the sealing plate 5. An insulating plate is sandwiched between the current collecting terminal and the sealing plate 5, and the insulating plate insulates the current collecting terminal from the sealing plate 5. The collector terminal is connected to the negative electrode tab 7 of the non-circular spiral electrode body 2 shown in FIG. The negative electrode plate 2B, which is the pre-wound electrode plate 3 of the non-circular spiral electrode body 2, is connected to the negative electrode terminal via the negative electrode tab 7 and the current collecting terminal.
【００１３】非円形スパイラル電極体２は、正極板２Ａ
である帯状の後巻極板４と、負極板２Ｂである先巻極板
３とをセパレータ２Ｃを介して積層して、図３の断面図
で示すように、非真円形の渦巻状に巻回したものであ
る。先巻極板３と後巻極板４とは帯状である。非円形ス
パイラル電極体２は、外装缶１に収納されて、最外周の
露出部を外装缶１に電気的に接触させている。非円形ス
パイラル電極体２は、最外周の露出部を後巻極板４であ
る正極板２Ａとしている。したがって、外装缶１は正極
となる。非円形スパイラル電極体２の先巻極板３である
負極板２Ｂは、非円形スパイラル電極体２の中央部分で
集電タブを接続している。The non-circular spiral electrode body 2 is a positive electrode plate 2A.
The belt-shaped post-winding electrode plate 4 which is a negative electrode plate 2B and the pre-winding electrode plate 3 which is a negative electrode plate 2B are laminated via a separator 2C and wound in a non-round circular spiral shape as shown in the cross-sectional view of FIG. It has been turned. The first winding electrode plate 3 and the second winding electrode plate 4 are strip-shaped. The non-circular spiral electrode body 2 is housed in the outer can 1, and the exposed portion of the outermost periphery is in electrical contact with the outer can 1. In the non-circular spiral electrode body 2, the outermost exposed portion is a positive electrode plate 2A which is the post-wound electrode plate 4. Therefore, the outer can 1 becomes a positive electrode. The negative electrode plate 2 </ b> B, which is the first-winding electrode plate 3 of the non-circular spiral electrode body 2, has a current collecting tab connected at the central portion of the non-circular spiral electrode body 2.
【００１４】正極板２Ａである後巻極板４は下記のよう
にして製造される。
正極スラリーを作成する工程
正極活物質としてＬｉＣｏＯ2を８５重量部、人造黒鉛
粉末を５重量部、カーボンブラック５重量部とを充分混
合した後、Ｎ−メチル−２−ピロリドンに溶かしたポリ
フッ化ビニリデン（ＰＶｄＦ）を固形分として５重量部
となるように加えて正極スラリーとする。The post-winding electrode plate 4 which is the positive electrode plate 2A is manufactured as follows. Step of creating positive electrode slurry 85 parts by weight of LiCoO 2 as a positive electrode active material, 5 parts by weight of artificial graphite powder, and 5 parts by weight of carbon black were thoroughly mixed, and then polyvinylidene fluoride dissolved in N-methyl-2-pyrrolidone (PVdF) is added as a solid content to 5 parts by weight to obtain a positive electrode slurry.
【００１５】 正極スラリーを芯体に塗布する工程
正極スラリーを、長さ３２４ｍｍ、幅３７．５ｍｍ、厚
さ２０μｍのアルミニウム箔である導電性の芯体の上に
両面塗布する。乾燥した後、ローラープレス機により圧
延する。なお、正極板２Ａの片面は、芯体であるアルミ
箔の末端部から約５０ｍｍは正極スラリーを塗布しな
い、アルミニウム面の露出部とした。アルミニウム面の
露出部は、外装缶１の内面に電気的に接触される部分と
なる。これを１１０℃で３時間真空乾燥処理して、帯状
の正極板２Ａを作製する。芯体にはアルミニウム箔以外
の金属板も使用できる。さらに、芯体の厚みは、１０μ
ｍ〜１００μｍ、好ましくは１５μｍ〜５０μｍとする
こともできる。Step of Applying Positive Electrode Slurry to Core Body The positive electrode slurry is applied to both sides of a conductive core body which is an aluminum foil having a length of 324 mm, a width of 37.5 mm and a thickness of 20 μm. After drying, it is rolled by a roller press. Note that one surface of the positive electrode plate 2A was an exposed portion of the aluminum surface on which about 50 mm from the end portion of the aluminum foil as the core body was not coated with the positive electrode slurry. The exposed portion of the aluminum surface is a portion that electrically contacts the inner surface of the outer can 1. This is vacuum dried at 110 ° C. for 3 hours to produce a strip-shaped positive electrode plate 2A. Metal plates other than aluminum foil can also be used for the core. Furthermore, the thickness of the core is 10μ
It can also be m to 100 μm, preferably 15 to 50 μm.
【００１６】負極板２Ｂである先巻極板３は下記のよう
にして製造される。
負極スラリーを作成する工程
負極活物質として、粒子径５〜２５μｍの天然黒鉛粉末
９５重量部（層間距離３．３５オングストローム）、Ｎ
−メチル−２−ピロリドンに溶かしたＰＶｄＦを固形分
として５重量部となるように加え、負極スラリーとす
る。The pre-rolled electrode plate 3 which is the negative electrode plate 2B is manufactured as follows. Step of Creating Negative Electrode Slurry As a negative electrode active material, 95 parts by weight of natural graphite powder having a particle diameter of 5 to 25 μm (interlayer distance 3.35 Å), N
-PVdF dissolved in methyl-2-pyrrolidone is added so as to have a solid content of 5 parts by weight to obtain a negative electrode slurry.
【００１７】 負極スラリーを芯体に塗布する工程
負極スラリーを、長さ３２０ｍｍ、幅３９．５ｍｍ、厚
さ１８μｍの銅箔である導電性の芯体の上に両面塗布す
る。乾燥した後、ローラープレス機により圧延する。な
お、芯体である銅箔は、末端から約３ｍｍまでは、負極
スラリーを塗布しない露出部分とした。この露出部分
に、ニッケル製の負極タブ（幅３ｍｍ）をスポット溶接
し、その後、１１０℃で３時間真空乾燥処理して、帯状
の負極板とした。芯体には銅箔以外の金属が使用でき
る。さらに、芯体の圧みは１８μｍ以外とすることもで
きる。Step of Applying Negative Electrode Slurry to Core Body The negative electrode slurry is coated on both surfaces of a conductive core body which is a copper foil having a length of 320 mm, a width of 39.5 mm and a thickness of 18 μm. After drying, it is rolled by a roller press. The copper foil as the core body was an exposed portion from which the negative electrode slurry was not applied up to about 3 mm from the end. A nickel negative electrode tab (width: 3 mm) was spot-welded to the exposed portion, and then vacuum dried at 110 ° C. for 3 hours to obtain a strip-shaped negative electrode plate. Metals other than copper foil can be used for the core. Furthermore, the pressure of the core may be other than 18 μm.
【００１８】正極板２Ａである後巻極板４と、負極板２
Ｂである先巻極板３を使用して、図３の断面構造をして
いる非円形スパイラル電極体２を製作した。図３に示す
非円形スパイラル電極体２は、先巻極板３と後巻極板４
とは巻き始め位置がずれている。最も中心に近い極板の
折曲部には、先巻極板３である負極板２Ｂのみが位置す
る。後巻極板４である正極板２Ａの巻き始め位置は、先
巻極板３の最初の折曲部よりも後退している。先巻極板
３である負極板２Ｂの最初の折曲部は、外周に巻かれて
いる負極板２Ｂに対向している。A post-rolling electrode plate 4 which is a positive electrode plate 2A, and a negative electrode plate 2
A non-circular spiral electrode body 2 having the cross-sectional structure of FIG. 3 was manufactured by using the pre-wound electrode plate 3 of B. The non-circular spiral electrode body 2 shown in FIG. 3 has a first winding electrode plate 3 and a second winding electrode plate 4.
The starting position of winding is off. Only the negative electrode plate 2B, which is the pre-wound electrode plate 3, is located at the bent portion of the electrode plate closest to the center. The winding start position of the positive electrode plate 2A, which is the post-winding electrode plate 4, is set back from the initial bent portion of the pre-winding electrode plate 3. The first bent portion of the negative electrode plate 2B, which is the pre-wound electrode plate 3, faces the negative electrode plate 2B wound around the outer periphery.
【００１９】図３に示す非円形スパイラル電極体２は、
下記のようにして製作できる。後巻極板４である正極板
２Ａと、先巻極板３である負極板２Ｂを、セパレータ２
Ｃを介して円筒状に巻取りする。セパレータ２Ｃは、幅
を４１．５ｍｍ、厚さを３４μｍとするポリエチレン製
の微多孔膜である。電極体の巻き終わり部分の表面に、
図１に示すように、ポリプロピレン製の接着テープ８を
付着して、巻き終わりを固定する。この時、後巻極板４
である正極板２Ａの巻始めは、先巻極板３である負極板
２Ｂの巻始めに対して、約１１ｍｍ遅らせて巻き取る。
先巻極板３の最初の折曲部に、後巻極板４が位置しない
ようにするためである。さらに、後巻極板４である正極
板２Ａは、芯体のアルミニウム面露出部分を、電極体の
外周部に位置させる。アルミニウム面露出部分を外装缶
１に電気接続するためである。円筒状に巻かれた電極体
は、図３に示すように、電極体の断面を長円形とするよ
うにプレス機で押圧して成形する。プレスされる電極体
は、図３に示すように、最初の折曲部には先巻極板３の
みが位置し、後巻極板４である正極板２Ａが位置しない
ようにする。この状態に押圧するには、円筒状に巻いた
電極体を、決められた位置で押圧して、このとき先巻極
板３である負極板２Ｂの折曲部が正極板２Ａの巻始め方
向の曲部にかからないようにした。The non-circular spiral electrode body 2 shown in FIG.
It can be made as follows. The positive electrode plate 2A which is the second winding electrode plate 4 and the negative electrode plate 2B which is the first winding electrode plate 3 are separated by
It is wound into a cylindrical shape through C. The separator 2C is a polyethylene microporous film having a width of 41.5 mm and a thickness of 34 μm. On the surface of the end of winding of the electrode body,
As shown in FIG. 1, an adhesive tape 8 made of polypropylene is attached to fix the winding end. At this time, the post-winding electrode plate 4
The winding start of the positive electrode plate 2A which is the above is wound about 11 mm later than the winding start of the negative electrode plate 2B which is the first winding electrode plate 3.
This is because the rear-wound electrode plate 4 is not located at the first bent portion of the first-wound electrode plate 3. Further, in the positive electrode plate 2A, which is the post-winding electrode plate 4, the exposed aluminum surface of the core body is located at the outer peripheral portion of the electrode body. This is for electrically connecting the exposed portion of the aluminum surface to the outer can 1. As shown in FIG. 3, the cylindrically wound electrode body is formed by pressing it with a pressing machine so that the electrode body has an oval cross section. As shown in FIG. 3, the electrode body to be pressed is such that only the first winding electrode plate 3 is positioned at the first bent portion and the positive electrode plate 2A which is the second winding electrode plate 4 is not positioned. In order to press in this state, the electrode body wound in a cylindrical shape is pressed at a predetermined position, and at this time, the bent portion of the negative electrode plate 2B, which is the pre-winding electrode plate 3, is bent in the winding start direction of the positive electrode plate 2A. I tried not to get into the song part.
【００２０】比較のために、非円形スパイラル電極体２
の断面形状を図１とする以外、前記の実施例の電池と同
じようにして非円形スパイラル電極体を試作した。従来
例の非円形スパイラル電極体２は、最も中心に近い極板
の折曲部で、先巻極板３である負極板２Ｂと、後巻極板
４である正極板２Ａの両方が対向するようにした。非円
形スパイラル電極体２がこの構造になるように、先巻極
板３である負極板２Ｂと、後巻極板４である正極板２Ａ
とを巻き取るときに、後巻極板４である正極板２Ａの巻
始めを、先巻極板３である負極板２Ｂの巻始めから約５
ｍｍ遅らせて巻いた。後巻極板４が先巻極板３から５ｍ
ｍしか遅れていない円筒状の電極体を製作し、これを、
非円形に押圧して、最初の折曲部で先巻極板３である負
極板２Ｂと、後巻極板４である正極板２Ａとがセパレー
タ２Ｃを介して対向するようにした。正極板２Ａと負極
板２Ｂの巻き始め位置を変更する以外、同じ正極板２Ａ
と負極板２Ｂとセパレータ２Ｃを使用して、非円形スパ
イラル電極体２を製作した。For comparison, a non-circular spiral electrode body 2
A non-circular spiral electrode body was manufactured in the same manner as the battery of the above-mentioned example except that the cross-sectional shape of FIG. The non-circular spiral electrode body 2 of the conventional example is a bent portion of the electrode plate closest to the center, and both the negative electrode plate 2B which is the first winding electrode plate 3 and the positive electrode plate 2A which is the second winding electrode plate 4 face each other. I did it. In order that the non-circular spiral electrode body 2 has this structure, the negative electrode plate 2B which is the first winding electrode plate 3 and the positive electrode plate 2A which is the second winding electrode plate 4
When winding and, the winding start of the positive electrode plate 2A, which is the post-winding electrode plate 4, is about 5 from the winding start of the negative electrode plate 2B, which is the first winding electrode plate 3.
It was rolled back by mm. The second winding electrode plate 4 is 5 m from the first winding electrode plate 3.
We made a cylindrical electrode body that was delayed only by m, and
By pressing in a non-circular shape, the negative electrode plate 2B, which is the first winding electrode plate 3, and the positive electrode plate 2A, which is the second winding electrode plate 4, are opposed to each other with the separator 2C at the first bent portion. The same positive electrode plate 2A except that the winding start positions of the positive electrode plate 2A and the negative electrode plate 2B are changed.
The non-circular spiral electrode body 2 was manufactured using the negative electrode plate 2B and the separator 2C.
【００２１】以上のようにして製作した、非円形スパイ
ラル電極体の耐圧検査をした。耐圧検査は、非円形スパ
イラル電極体２を外装缶１に入れない状態で、また、正
極板２Ａと負極板２Ｂとの間に電解液がない状態とし
て、正極板２Ａと負極板２Ｂに５００Ｖの直流を加え
て、漏れ電流を測定した。非円形スパイラル電極体２を
外装缶１に入れず、電解液を入れない状態で測定するの
は、正極板２Ａと負極板２Ｂとが電気的にどのように状
態で電気接続されているかを測定するためである。正極
板２Ａと負極板２Ｂの間に電解液があると、電解液を介
して電流が流れて絶縁性を測定できない。理想の非円形
スパイラル電極体２は、正極板２Ａと負極板２Ｂの間に
電解液がない状態では、漏れ電流が０となる。The pressure resistance of the non-circular spiral electrode body manufactured as described above was tested. The withstand voltage test is performed in a state where the non-circular spiral electrode body 2 is not put in the outer can 1 and when there is no electrolytic solution between the positive electrode plate 2A and the negative electrode plate 2B. Direct current was applied to measure the leakage current. The non-circular spiral electrode body 2 is not put in the outer can 1 and the electrolyte is not put into the measurement, and it is measured how the positive electrode plate 2A and the negative electrode plate 2B are electrically connected. This is because If there is an electrolytic solution between the positive electrode plate 2A and the negative electrode plate 2B, a current flows through the electrolytic solution and the insulation cannot be measured. The ideal non-circular spiral electrode body 2 has a leakage current of 0 when there is no electrolytic solution between the positive electrode plate 2A and the negative electrode plate 2B.
【００２２】この条件で測定して、漏れ電極が５ｍＡ以
上の非円形スパイラル電極体を不良品とすると、本発明
の実施例の非円形スパイラル電極体は、不良率がわずか
に２％であった。最初の折曲部で正極板２Ａと負極板２
Ｂとが対向する従来の非円形スパイラル電極体は、不良
率が１０％となった。耐圧検査は、本発明の実施例と、
従来例にそれぞれ１０００個の非円形スパイラル電極体
を試作して検査した。When the non-circular spiral electrode body having a leakage electrode of 5 mA or more measured under these conditions is regarded as a defective product, the non-circular spiral electrode body of the embodiment of the present invention had a defective rate of only 2%. . At the first bent portion, the positive electrode plate 2A and the negative electrode plate 2
The conventional non-circular spiral electrode body facing B has a defect rate of 10%. The breakdown voltage test is performed in accordance with the embodiment of the present invention,
For each of the conventional examples, 1000 non-circular spiral electrode bodies were prototyped and inspected.
【００２３】以上のようにして製作された非円形スパイ
ラル電極体は、負極タブを封口体の集電端子にスポット
溶接した後、外装缶１に挿入して、電解液を注入し、封
口板５と外装缶１の境界をレーザー溶接し、封止してリ
チウムイオン二次電池となる。In the non-circular spiral electrode body manufactured as described above, the negative electrode tab is spot-welded to the current collector terminal of the sealing body, and then inserted into the outer can 1 to inject the electrolytic solution to seal the sealing plate 5. The boundary between the outer can 1 and the outer can 1 is laser-welded and sealed to form a lithium ion secondary battery.
【００２４】以上の非円形スパイラル電極体２は、正極
板２Ａと負極板２Ｂとセパレータ２Ｃとを積層状態で円
筒状に巻き、その後これを両側から押圧して非円形スパ
イラル状として製作している。この方法によらず、正極
板２Ａと負極板２Ｂとをスパイラル状に巻くときに、非
円形スパイラル状として、非円形スパイラル電極体２を
製作することもできる。さらに、正極板２Ａと負極板２
Ｂとセパレータ２Ｃとを巻いて楕円形の電極体とし、そ
の後、楕円形の電極体を長辺に平行な面で両側から押圧
して非円形スパイラル電極体２を製作することもでき
る。いずれの方法で製作された非円形スパイラル電極体
２も、最初の折曲部に正極板２Ａと負極板２Ｂとが対向
する形状にすると、この部分で絶縁性が低下した。この
構造の非円形スパイラル電極体２は、極めて小さい曲率
半径で折曲される極板が、セパレータ２Ｃを損傷して絶
縁性を低下させるからである。しかしながら、最初の折
曲部で正極板２Ａと負極板２Ｂとが対向しない構造とす
る本発明の電池に内蔵される非円形スパイラル電極体２
は、最初の小さい曲率半径で折曲される部分において
は、先巻極板３がセパレータ２Ｃを介して対向するの
で、絶縁性の低下を極限できる。The above-mentioned non-circular spiral electrode body 2 is manufactured as a non-circular spiral shape by winding the positive electrode plate 2A, the negative electrode plate 2B and the separator 2C in a laminated state and then pressing them from both sides. . Alternatively, the non-circular spiral electrode body 2 may be manufactured to have a non-circular spiral shape when the positive electrode plate 2A and the negative electrode plate 2B are spirally wound. Further, the positive electrode plate 2A and the negative electrode plate 2
The non-circular spiral electrode body 2 can be manufactured by winding B and the separator 2C to form an elliptical electrode body, and then pressing the elliptical electrode body from both sides with surfaces parallel to the long sides. In the non-circular spiral electrode body 2 manufactured by any method, when the positive electrode plate 2A and the negative electrode plate 2B were made to face each other at the first bent portion, the insulating property was deteriorated at this portion. This is because, in the non-circular spiral electrode body 2 having this structure, the electrode plate bent with an extremely small radius of curvature damages the separator 2C and deteriorates the insulating property. However, the non-circular spiral electrode body 2 incorporated in the battery of the present invention is structured such that the positive electrode plate 2A and the negative electrode plate 2B do not face each other at the first bent portion.
In the first bent portion with a small radius of curvature, the pre-wound electrode plates 3 face each other with the separator 2C in between, so that the decrease in insulation can be minimized.
【００２５】[0025]
【発明の効果】本発明の非円形スパイラル電極体の電池
は、非円形スパイラル電極体の正極板と負極板のショー
トや絶縁不良を著しく改善できる特長がある。それは、
本発明の電池の非円形スパイラル電極体が、最も小さい
曲率半径で折曲される最初の折曲部において、セパレー
タを介して先巻極板と後巻極板とを対向させることな
く、先巻極板のみを対向させるからである。曲率半径の
小さい最初の折曲部で、先巻極板がセパレータを損傷さ
せたとしても、非円形スパイラル電極体の極板の絶縁性
は低下しない。同じ極板を対向させているからである。
非円形スパイラル電極体は、極板を小さい曲率半径で折
曲するほど、セパレータを損傷させやすい。折曲された
極板のエッジが鋭くなって、セパレータを損傷させるか
らである。本発明の非円形スパイラル電極体の電池の、
非円形スパイラル電極体は、最もセパレータが損傷され
やすい最初の折曲部において、正極板と負極板の絶縁不
良が有効に防止される。このため、正極板と負極板の絶
縁不良に起因する不良率を極限して電池を高い歩留で多
量生産できる。とくに、本発明の電池は、このことを実
現するために、特別な部材を使用しない。後巻極板を巻
き始める位置をわずかにずらせるだけである。このた
め、正極板と負極板の絶縁性を改善する構造は、極めて
簡単である。したがって、電池の製造コストを高くする
ことなく、極板の絶縁不良を有効に防止できる特長があ
る。EFFECTS OF THE INVENTION The non-circular spiral electrode body battery of the present invention has a feature that it is possible to remarkably reduce short-circuiting and insulation failure between the positive electrode plate and the negative electrode plate of the non-circular spiral electrode body. that is,
The non-circular spiral electrode body of the battery of the present invention has the first winding portion bent at the smallest radius of curvature, and the first winding electrode plate and the second winding electrode plate do not face each other through the separator, This is because only the polar plates face each other. Even if the first-winding electrode plate damages the separator at the first bent portion having a small radius of curvature, the insulating property of the electrode plate of the non-circular spiral electrode body does not deteriorate. This is because the same electrode plates face each other.
The non-circular spiral electrode body is more likely to damage the separator as the electrode plate is bent with a smaller radius of curvature. This is because the edge of the bent electrode plate becomes sharp and damages the separator. Of the battery of the non-circular spiral electrode body of the present invention,
The non-circular spiral electrode body effectively prevents defective insulation between the positive electrode plate and the negative electrode plate at the first bent portion where the separator is most likely to be damaged. Therefore, it is possible to mass-produce batteries with a high yield by limiting the defective rate due to defective insulation between the positive electrode plate and the negative electrode plate. In particular, the battery of the invention does not use any special components to achieve this. It only shifts the starting position of the post-winding electrode plate slightly. Therefore, the structure for improving the insulation between the positive electrode plate and the negative electrode plate is extremely simple. Therefore, there is a feature that the insulation failure of the electrode plate can be effectively prevented without increasing the manufacturing cost of the battery.
【図１】 従来の電池の非円形スパイラル電極体を示す
断面図FIG. 1 is a sectional view showing a non-circular spiral electrode body of a conventional battery.
【図２】 本発明の実施例にかかる非円形スパイラル電
極体の電池を示す断面図FIG. 2 is a cross-sectional view showing a battery having a non-circular spiral electrode body according to an embodiment of the present invention.
【図３】 図２に示す電池の非円形スパイラル電極を示
す断面図3 is a cross-sectional view showing a non-circular spiral electrode of the battery shown in FIG.
１…外装缶
２…スパイラル電極体 ２Ａ…正極板
２Ｂ…負極板
２Ｃ…セパレータ
３…先巻極板
４…後巻極板
５…封口板
６…負極端子
７…負極タブ
８…接着テープ1 ... Exterior can 2 ... Spiral electrode body 2A ... Positive electrode plate
2B ... Negative electrode plate 2C ... Separator 3 ... Pre-wound electrode plate 4 ... Post-wound electrode plate 5 ... Seal plate 6 ... Negative electrode terminal 7 ... Negative electrode tab 8 ... Adhesive tape
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森 英雄 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 (56)参考文献 特開 平５−135780（ＪＰ，Ａ) 特開 昭59−27456（ＪＰ，Ａ) 実開 平６−58554（ＪＰ，Ｕ) 実開 昭54−149623（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01M 10/04 H01M 2/18 H01M 4/78 H01M 10/38 H01M 10/40 ─────────────────────────────────────────────────── --- Continuation of front page (72) Inventor Hideo Mori 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd. (56) Reference JP-A-5-135780 (JP, A) JP Showa 59-27456 (JP, A) Actually open 6-58554 (JP, U) Actually open Sho 54-149623 (JP, U) (58) Fields investigated (Int.Cl. 7 , DB name) H01M 10 / 04 H01M 2/18 H01M 4/78 H01M 10/38 H01M 10/40
Claims (5)
(2C)を介して非円形のスパイラル状に巻かれているスパ
イラル電極を内蔵する電池において、 ＋−の極板は巻き始め位置がずれており、最も中心に近
い極板の折曲部(B)には先巻極板(3)のみが位置し、後巻
極板(4)の巻き始め位置は、先巻極板(3)の最初の折曲部
(B)よりも後退して位置しており、先巻極板(3)の最初の
折曲部(B)は外周に巻かれている先巻極板(3)に対向して
なることを特徴とする非円形スパイラル電極体の電池。1. A positive electrode plate (2A) and a negative electrode plate (2B) are separators.
In a battery with a built-in spiral electrode wound in a non-circular spiral shape via (2C), the winding start position of the +/- electrode plate is shifted, and the bent part (B ) Only the first winding electrode plate (3) is located, and the winding start position of the second winding electrode plate (4) is the first bent portion of the first winding electrode plate (3).
It is located rearward of (B), and the first bent part (B) of the pre-wound electrode plate (3) faces the pre-wound electrode plate (3) wound around the outer circumference. Characteristic non-circular spiral electrode body battery.
求項１に記載される非円形スパイラル電極体の電池。A battery having a non-circular spiral electrode body according to claim 1.
(2A)を後巻極板(4)とする請求項１に記載される非円形The non-circular shape according to claim 1, wherein (2A) is a post-winding electrode plate (4).
スパイラル電極体の電池。Battery with spiral electrode body.
(2B)を後巻極板(4)とする請求項１に記載される非円形The non-circular shape according to claim 1, wherein (2B) is a post-winding electrode plate (4).
スパイラル電極体の電池。Battery with spiral electrode body.
円形スパイラル電極体の電池。Battery with circular spiral electrode body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14436695A JP3525170B2 (en) | 1995-06-12 | 1995-06-12 | Battery with non-circular spiral electrode body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14436695A JP3525170B2 (en) | 1995-06-12 | 1995-06-12 | Battery with non-circular spiral electrode body |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08339817A JPH08339817A (en) | 1996-12-24 |
| JP3525170B2 true JP3525170B2 (en) | 2004-05-10 |
Family
ID=15360447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14436695A Expired - Fee Related JP3525170B2 (en) | 1995-06-12 | 1995-06-12 | Battery with non-circular spiral electrode body |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3525170B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100274895B1 (en) * | 1998-09-03 | 2000-12-15 | 김순택 | Manufacturing method of secondary battery |
| JP2001155774A (en) | 1999-11-25 | 2001-06-08 | Nec Mobile Energy Kk | Nonaqueous electrolyte secondary battery |
| JP4686807B2 (en) * | 2000-03-28 | 2011-05-25 | 株式会社Ｇｓユアサ | Winding battery |
| KR100515830B1 (en) * | 2003-03-12 | 2005-09-21 | 삼성에스디아이 주식회사 | Electrode unit and second battery using the same |
| US9236632B2 (en) | 2010-02-23 | 2016-01-12 | Tdk Corporation | Electrochemical device and method for manufacturing electrochemical device |
| JP6103342B2 (en) | 2012-09-13 | 2017-03-29 | 株式会社Ｇｓユアサ | Electricity storage element |
-
1995
- 1995-06-12 JP JP14436695A patent/JP3525170B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08339817A (en) | 1996-12-24 |
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