JP2002157990A - Separator for battery and electrode group using this separator - Google Patents
Separator for battery and electrode group using this separatorInfo
- Publication number
- JP2002157990A JP2002157990A JP2000354557A JP2000354557A JP2002157990A JP 2002157990 A JP2002157990 A JP 2002157990A JP 2000354557 A JP2000354557 A JP 2000354557A JP 2000354557 A JP2000354557 A JP 2000354557A JP 2002157990 A JP2002157990 A JP 2002157990A
- Authority
- JP
- Japan
- Prior art keywords
- battery separator
- electrode
- battery
- electrode group
- separator
- 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
- Cell Separators (AREA)
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、電池用セパレータ
およびそれを用いた電極群に関する。The present invention relates to a battery separator and an electrode group using the same.
【０００２】[0002]
【従来の技術】従来、二次電池としては、ニッケルカド
ミウム電池が主流であったが、高容量で安全性が高く、
しかもカドミウムを使用しないという理由から、ニッケ
ル水素電池が、それに代わりつつある。特に、ニッケル
水素電池は、円筒型や角型の小型二次電池として、携帯
電話、ノートブック型パソコン等に汎用されている。ま
た、ニッケル水素電池は、体積エネルギー密度が高いこ
とから、電気自動車用電池（走行用電池）や電力貯蔵用
二次電池としての使用が期待されている。2. Description of the Related Art Conventionally, nickel cadmium batteries have been the mainstream as secondary batteries, but they have high capacity and high safety.
Moreover, nickel-metal hydride batteries are replacing them because they do not use cadmium. In particular, nickel-metal hydride batteries are widely used in mobile phones, notebook computers, and the like as small cylindrical or square secondary batteries. Further, nickel hydride batteries are expected to be used as batteries for electric vehicles (batteries for traveling) and secondary batteries for power storage because of their high volume energy density.
【０００３】電池では、正極および負極の短絡を防止す
るために、前記両極間に電池用セパレータを介在させて
いる。前記電池用セパレータの使用方法としては、例え
ば、シート状正極または負極の上にシート状電池用セパ
レータを積層し、この上にシート状負極または正極を積
層し、さらにこの上にシート状電池用セパレータを積層
し、この４層のシート状積層体を捲回し、この捲回体を
電池缶に挿入する方法がある。この他に、袋状の電池用
セパレータに、その集電部が露出する状態で正極または
負極を挿入し、この袋と袋の間に、前記袋に挿入された
電極とは異なる電極を配置して積層し、電極群を構成す
るという方法もある。このなかで、大型電池の場合は、
電池体積を小さくできるという理由から、前記捲回体よ
りも前記電極群の方が適している。In a battery, a battery separator is interposed between the positive and negative electrodes in order to prevent a short circuit. As a method of using the battery separator, for example, a sheet-shaped battery separator is laminated on a sheet-shaped positive electrode or a negative electrode, a sheet-shaped negative electrode or a positive electrode is laminated thereon, and further, a sheet-shaped battery separator is further laminated thereon. Are laminated, the four-layered sheet-like laminate is wound, and the wound body is inserted into a battery can. In addition, a positive electrode or a negative electrode is inserted into the bag-shaped battery separator in a state where the current collector is exposed, and an electrode different from the electrode inserted into the bag is arranged between the bag and the bag. There is also a method of forming an electrode group by laminating the electrodes. In the case of a large battery,
The electrode group is more suitable than the wound body because the battery volume can be reduced.
【０００４】前記袋状電池用セパレータは、通常、シー
ト状電池用セパレータを折り曲げて、開口部を残しその
縁部をヒートシールすることにより作製できるが、この
作業は、極めて煩雑である。また、電極を袋状電池用セ
パレータに挿入する作業や、２つの袋状電池用セパレー
タの間に電極を挟み、これらを積層する工程も煩雑な工
程である。このため、電極群の生産効率は、極めて低
く、特に大型電池では、多数の電極群を必要とするた
め、この電極群に起因する生産性の問題とコストの問題
があった。[0004] The bag-shaped battery separator can usually be produced by bending the sheet-shaped battery separator, leaving an opening, and heat-sealing the edge thereof, but this operation is extremely complicated. Also, the operation of inserting the electrodes into the bag-shaped battery separator and the process of sandwiching the electrodes between the two bag-shaped battery separators and laminating them are also complicated processes. For this reason, the production efficiency of the electrode group is extremely low. In particular, a large-sized battery requires a large number of electrode groups, and thus has a problem of productivity and a problem of cost due to this electrode group.
【０００５】[0005]
【発明が解決しようとする課題】そこで、本発明の目的
は、電極群を効率良く製造できる電池用セパレータ、そ
れを用いた電極群を提供することである。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a battery separator capable of efficiently producing an electrode group, and an electrode group using the same.
【０００６】[0006]
【課題を解決するための手段】前記目的を達成するため
に、本発明の電池用セパレータは、プリーツ状に屈曲し
た形状を有するという構成である。このような形状の本
発明の電池用セパレータを用いれば、後述のように、簡
単に電極群を製造できる。In order to achieve the above object, the battery separator of the present invention has a configuration in which it has a pleated shape. By using the battery separator of the present invention having such a shape, an electrode group can be easily manufactured as described later.
【０００７】前記プリーツ形状を好ましく維持でき、ま
た本発明の電極群の製造時において必要となる剛性を有
するという理由から、本発明の電池用セパレータは、超
高分子量ポリオレフィンから形成されていることが好ま
しい。特に好ましくは、超高分子量ポリオレフィン粒子
が相互に連結し、前記粒子間の空隙により多孔構造が形
成された電池用セパレータである。なお、従来、アルカ
リ二次電池の電池用セパレータとして使用されていたポ
リオレフィン繊維不織布は、プリーツ状に加工すること
ができず、加工してもその直後にプリーツ形状を消失
し、また剛性も低い。前記超高分子量ポリオレフィンと
しては、例えば、超高分子量ポリエチレン（ＵＨＰＥ）
または超高分子量ポリプロピレンがあるが、粘度平均分
子量が５０万以上のＵＨＰＥが好ましく、特に好ましく
は、粘度平均分子量が５０万〜１６００万の範囲のＵＨ
ＰＥである。本発明の電池用セパレータは、アルカリ二
次電池に使用することが好ましい。[0007] The battery separator of the present invention may be formed of an ultra-high molecular weight polyolefin because the pleat shape can be preferably maintained and the rigidity required for manufacturing the electrode group of the present invention is obtained. preferable. Particularly preferred is a battery separator in which ultrahigh molecular weight polyolefin particles are interconnected and a porous structure is formed by voids between the particles. In addition, the polyolefin fiber nonwoven fabric conventionally used as a battery separator for an alkaline secondary battery cannot be processed into a pleated shape, and even after processing, the pleated shape disappears immediately after that, and the rigidity is low. Examples of the ultrahigh molecular weight polyolefin include ultrahigh molecular weight polyethylene (UHPE)
Alternatively, there is an ultrahigh molecular weight polypropylene, but UHPE having a viscosity average molecular weight of 500,000 or more is preferable, and particularly preferably a UHPE having a viscosity average molecular weight of 500,000 to 16,000,000.
PE. The battery separator of the present invention is preferably used for an alkaline secondary battery.
【０００８】つぎに、本発明の電極群は、プリーツ状に
屈曲された電池用セパレータの一面の凹部に一方の電極
（正極または負極）が配置され、前記電池用セパレータ
の他面の凹部に他方の電極（負極または正極）が配置さ
れているという構成である。Next, in the electrode group of the present invention, one electrode (a positive electrode or a negative electrode) is disposed in a concave portion on one surface of a battery separator bent in a pleated shape, and the other electrode is disposed in a concave portion on the other surface of the battery separator. (A negative electrode or a positive electrode) is disposed.
【０００９】このような構成の本発明の電極群は、袋状
電池用セパレータを使用した従来の電極群に比べ、効率
良く生産できる。The electrode group of the present invention having such a structure can be produced more efficiently than a conventional electrode group using a bag-shaped battery separator.
【００１０】本発明の電極群において、電池用セパレー
タの凹部への前記電極の配置が、前記電極の集電部が前
記凹部から突出し、かつ前記電極のその他の部分が前記
電池用セパレータからはみ出ない状態での配置であるこ
とが好ましい。また、前記電池用セパレータの各凹部の
折り目方向両端が封止されていることが好ましい。前記
両端が封止されていれば、正極および負極が固定され、
信頼性に優れるようになる。また、前述と同様の理由に
より、前記電池用セパレータは、超高分子量ポリオレフ
ィンで形成されていることが好ましく、これの好ましい
例は前述と同様である。また、本発明の電極群は、アル
カリ二次電池に使用することが好ましい。In the electrode group of the present invention, the arrangement of the electrode in the concave portion of the battery separator is such that the current collecting portion of the electrode protrudes from the concave portion, and other portions of the electrode do not protrude from the battery separator. Preferably, the arrangement is in a state. Further, it is preferable that both ends in the fold direction of each concave portion of the battery separator are sealed. If both ends are sealed, the positive electrode and the negative electrode are fixed,
Becomes highly reliable. Further, for the same reason as described above, the battery separator is preferably formed of an ultra-high molecular weight polyolefin, and preferable examples thereof are the same as those described above. Further, the electrode group of the present invention is preferably used for an alkaline secondary battery.
【００１１】つぎに、本発明の電極群の製造方法は、プ
リーツ状に屈曲している電池用セパレータを準備する工
程と、前記電池用セパレータの一面の凹部に一方の電極
を配置し、前記電池用セパレータの他面の凹部に他方の
電極を配置する工程とを有する方法である。Next, in the method for manufacturing an electrode group according to the present invention, a step of preparing a battery separator bent in a pleated shape, and disposing one electrode in a concave portion on one surface of the battery separator, Arranging the other electrode in a concave portion on the other surface of the separator for use.
【００１２】このように、プリーツ状に屈曲した電池用
セパレータを用いれば、その凹部に電極を挿入すること
により、電極群が簡単に製造できる。As described above, by using a battery separator bent in a pleated shape, an electrode group can be easily manufactured by inserting an electrode into the concave portion.
【００１３】本発明の電極群の製造方法は、前記電池用
セパレータの各凹部の折り目方向両端を封止する工程を
有することが好ましい。また、本発明の電極群の製造方
法は、プリーツ状に屈曲している前記電池用セパレータ
の各凹部の折り目方向一端を封止し、他端を広げる工程
を有していてもよい。このようにすると、電池用セパレ
ータの広がった方向から電極を容易に挿入することがで
き、生産効率がさらに良くなる。It is preferable that the method for manufacturing an electrode group of the present invention includes a step of sealing both ends in the fold direction of each concave portion of the battery separator. The method for manufacturing an electrode group according to the present invention may include a step of sealing one end in a fold direction of each concave portion of the battery separator bent in a pleated shape and expanding the other end. In this case, the electrode can be easily inserted from the direction in which the battery separator spreads, and the production efficiency is further improved.
【００１４】また、前記電池用セパレータの一面の凹部
に一方の電極を配置し、前記電池用セパレータの他面の
凹部に他方の電極を配置する工程において、前記両電極
を、前記電極の集電部が前記凹部から突出し、かつ前記
電極のその他の部分が前記電池用セパレータからはみ出
ない状態で配置することが好ましい。In the step of arranging one electrode in a recess on one surface of the battery separator and arranging the other electrode in a recess on the other surface of the battery separator, It is preferable that the portion protrudes from the concave portion and the other portion of the electrode is arranged so as not to protrude from the battery separator.
【００１５】つぎに、本発明の電池は、電極群として、
前記本発明の電池を有する。前述のように、本発明の電
極群は、生産効率が高いため、これを用いれば、電池の
生産効率の向上およびコストの低減に寄与できる。な
お、本発明の電池は、アルカリ二次電池であることが好
ましい。Next, the battery of the present invention comprises, as an electrode group,
It has the battery of the present invention. As described above, since the electrode group of the present invention has a high production efficiency, the use of the electrode group can contribute to an improvement in the production efficiency of the battery and a reduction in cost. The battery of the present invention is preferably an alkaline secondary battery.
【００１６】[0016]
【発明の実施の形態】本発明の電極群は、例えば、以下
に示すようにして製造できる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The electrode group of the present invention can be manufactured, for example, as follows.
【００１７】まず、図１に示すようなプリーツ状に屈曲
した形状の電池用セパレータ１を準備する。この電池用
セパレータは、例えば、つぎのようにして作製できる。First, a battery separator 1 having a pleated shape as shown in FIG. 1 is prepared. This battery separator can be produced, for example, as follows.
【００１８】まず、超高分子量ポリオレフィン粉末を加
熱焼結して焼結体を作製し、この焼結体を切削旋盤等で
切削して多孔性シートを製造する。この多孔性シートで
は、複数の超高分子量ポリオレフィン粒子が相互に連結
し、前記粒子間の空隙により多孔構造が形成されてい
る。前記超高分子量ポリオレフィン粉末の平均粒径は、
特に制限されないが、例えば、１０〜２００μｍの範囲
である。また、前記加熱焼結は、予め、減圧した状態に
超高分子量ポリオレフィン粉末を置き、ここに前記超高
分子量ポリオレフィンの融点以上に加熱された水蒸気を
導入することによって行うことが好ましい。前記加熱焼
結温度は、例えば、１３０〜２００℃の範囲である。前
記多孔性シートは、帯状に成形するが、その幅は、電極
幅よりも大きくする。また、その全長は、配置する電極
数等により適宜決定される。First, a super-high molecular weight polyolefin powder is heated and sintered to produce a sintered body, and the sintered body is cut by a cutting lathe or the like to produce a porous sheet. In this porous sheet, a plurality of ultrahigh molecular weight polyolefin particles are interconnected, and a porous structure is formed by voids between the particles. The average particle size of the ultra-high molecular weight polyolefin powder,
Although not particularly limited, for example, it is in the range of 10 to 200 μm. The heat sintering is preferably performed by placing an ultrahigh molecular weight polyolefin powder in a reduced pressure state in advance, and introducing steam heated to a temperature equal to or higher than the melting point of the ultrahigh molecular weight polyolefin. The heat sintering temperature is, for example, in the range of 130 to 200 ° C. The porous sheet is formed in a belt shape, and the width thereof is larger than the electrode width. The total length is appropriately determined by the number of electrodes to be arranged and the like.
【００１９】前記多孔性シートにおいて、例えば、気孔
率は２０〜９０体積％の範囲であり、ＪＩＳ Ｐ ８１
１７に従って測定される通気度は２０ｓｅｃ／１００ｍ
ｌ以下であり、好ましくは、気孔率は３０〜７０体積％
の範囲であり、前記通気度は０．１〜２０ｓｅｃ／１０
０ｍｌの範囲である。前記気孔率（体積％）は、前記多
孔性シートの片面の面積Ｓ、厚みｄおよび重量ｍと、前
記超高分子量ポリオレフィンの比重ｒとから、下記の式
（数１）により算出できる。また、前記多孔性シート
は、プリーツ加工における折り目部分に割れを生じたり
すると、これが短絡の原因となるから、十分な強度を有
することが好ましく、例えば、長手方向の引張強度が
４．９ＭＰa（５０ｋｇ／ｃｍ2）以上であることが好ま
しく、特に好ましくは長手方向の引張強度が７．８４〜
２９．４ＭＰa（８０〜３００ｋｇ／ｃｍ2）の範囲であ
る。In the porous sheet, for example, the porosity is in the range of 20 to 90% by volume, and JIS P81
The air permeability measured according to No. 17 is 20 sec / 100 m
1 or less, and preferably has a porosity of 30 to 70% by volume.
And the air permeability is 0.1 to 20 sec / 10
The range is 0 ml. The porosity (volume%) can be calculated from the area S, the thickness d, and the weight m on one side of the porous sheet, and the specific gravity r of the ultrahigh molecular weight polyolefin by the following equation (Equation 1). In addition, the porous sheet preferably has sufficient strength because cracks at the fold portion in the pleating process cause a short circuit. For example, the porous sheet preferably has a tensile strength in the longitudinal direction of 4.9 MPa (50 kg). / Cm 2 ) or more, and particularly preferably, the tensile strength in the longitudinal direction is 7.84 to
It is in the range of 29.4 MPa (80 to 300 kg / cm 2 ).
【００２０】（数１） 気孔率（体積％）＝［１−（（ｍ／ｒ）／（Ｓ×
ｄ））］×１００(Equation 1) Porosity (volume%) = [1-((m / r) / (S ×
d))] x 100
【００２１】つぎに、前記多孔性シートを、プリーツ状
に加工し、これを電池用セパレータとする。前記プリー
ツ加工は、通常のプリーツ加工機を用いて実施できる。
この時の折幅は、電極の集電部が突出するように、電極
の高さ（全長）よりも小さくする。Next, the porous sheet is processed into a pleated shape, which is used as a battery separator. The pleating process can be performed using a normal pleating machine.
The folding width at this time is set smaller than the height (total length) of the electrode so that the current collecting portion of the electrode protrudes.
【００２２】つぎに、図２に示すように、前記プリーツ
状に屈曲した電池用セパレータ１の一面の各凹部に負極
２を、その集電部２ａが前記凹部から突出し、かつ前記
負極２が前記電池用セパレータ１の幅方向にはみ出ない
状態で配置する。同様に、図３に示すように、前記電池
用セパレータ１の他面の各凹部に、正極３を、その集電
部３ａが前記凹部から突出し、かつ前記正極３が前記電
池用セパレータ１の幅方向にはみ出ない状態で配置す
る。これらの電極の配置は、容易にできるので、機械に
よって実施してもよい。Next, as shown in FIG. 2, the negative electrode 2 is protruded from each concave portion of one surface of the battery separator 1 bent in a pleated shape, the current collecting portion 2a protrudes from the concave portion, and the negative electrode 2 is The battery separator 1 is arranged so as not to protrude in the width direction. Similarly, as shown in FIG. 3, a positive electrode 3 is provided in each concave portion on the other surface of the battery separator 1, a current collecting portion 3 a thereof protrudes from the concave portion, and the positive electrode 3 has a width of the battery separator 1. Arrange them so that they do not protrude in the direction. The arrangement of these electrodes is easy and may be implemented by machine.
【００２３】所定枚数の電極を配置後、前記電池用セパ
レータを、その長手方向に圧縮して前記電池用セパレー
タと電極とを密着させる。そして、前記電池用セパレー
タの幅方向の両縁部を、前記超高分子量ポリオレフィン
の融点以上の温度で加熱して溶融させることにより、電
極が配置されている各凹部の折り目方向両端を封止す
る。この封止は、例えば、前記融点以上に加熱したプレ
ートに前記電池用セパレータの幅方向の両縁部を接触さ
せることにより実施できる。前記加熱温度は、例えば、
９０〜２００℃の範囲である。このようにして、目的と
する電極群を得ることができる。図４に、この電極群の
一例を示す。同図において、図１から図３と同一部分に
は同一符号を付しており、１ａは、電池用セパレータの
幅方向の一方の縁部を示す。また、前記電池用セパレー
タに電池複数個分の電極を配置し、前記電池用セパレー
タの幅方向両縁部を溶融して複数の電極群を一体として
作製し、それから、電極群ごとに切断してもよい。After arranging a predetermined number of electrodes, the battery separator is compressed in the longitudinal direction to bring the battery separator into close contact with the electrodes. Then, both edges in the width direction of the battery separator are heated and melted at a temperature equal to or higher than the melting point of the ultrahigh molecular weight polyolefin, thereby sealing both ends in the fold direction of each concave portion in which the electrode is disposed. . This sealing can be performed, for example, by bringing both edges in the width direction of the battery separator into contact with a plate heated above the melting point. The heating temperature is, for example,
It is in the range of 90-200 ° C. Thus, a desired electrode group can be obtained. FIG. 4 shows an example of this electrode group. In the figure, the same parts as those in FIGS. 1 to 3 are denoted by the same reference numerals, and 1a indicates one edge in the width direction of the battery separator. In addition, the electrodes for a plurality of batteries are arranged on the battery separator, a plurality of electrode groups are integrally formed by fusing both edges in the width direction of the battery separator, and then cut for each electrode group. Is also good.
【００２４】つぎに、この他の電極群の製造方法の一例
について説明する。Next, an example of a method for manufacturing another electrode group will be described.
【００２５】前述と同様にして、プリーツ状に屈曲した
電池用セパレータを準備する。そして、この電池用セパ
レータにおいて、その幅方向の一方の縁部を溶融して各
凹部の折り目方向の一端を封止する。また、前記電池用
セパレータの幅方向の他方の縁部を広げ、前記電池用セ
パレータを扇状に広げる。このようにすれば、広げた方
から電極を容易に挿入することができる。図５に、扇状
に広げた状態の電池用セパレータ１を示す。この電池用
セパレータ１の一面の各凹部には、集電部２ａが突出し
た状態で負極２が配置されている。そして、前記電池用
セパレータの両面の各凹部に電極を配置した後、前記電
池用セパレータを、その長手方向に圧縮して扇が閉じた
状態にする。この状態で、前記電池用セパレータの幅方
向の他方の縁部を溶融して各凹部の折り目方向の他端を
封止する。このようにしても、目的とする電極群を得る
ことができる。なお、前記各溶融封止は、前述と同様の
方法により実施できる。A pleated bent battery separator is prepared in the same manner as described above. Then, in this battery separator, one edge in the width direction is melted to seal one end in the fold direction of each concave portion. Further, the other edge in the width direction of the battery separator is widened, and the battery separator is fan-shaped. With this configuration, the electrode can be easily inserted from the side where the electrode is spread. FIG. 5 shows the battery separator 1 in a fan-shaped state. The negative electrode 2 is disposed in each concave portion on one surface of the battery separator 1 with the current collecting portion 2a protruding. Then, after the electrodes are arranged in the respective concave portions on both surfaces of the battery separator, the battery separator is compressed in the longitudinal direction to make the fan closed. In this state, the other edge in the width direction of the battery separator is melted to seal the other end of each recess in the fold direction. Even in this way, a desired electrode group can be obtained. In addition, each said fusion sealing can be implemented by the method similar to the above.
【００２６】このようにして得られた電極群は、通常の
方法によって電池に組み込むことができる。The electrode group thus obtained can be incorporated into a battery by a usual method.
【００２７】[0027]
【実施例】つぎに、実施例について比較例と併せて説明
する。Next, examples will be described together with comparative examples.
【００２８】（実施例１）ＵＨＰＥ粉末（粘度平均分子
量５００万、融点１３５℃、平均粒径１５０μｍ、メッ
シュ分級品）を保形具に充填した。この保形具は、金属
製円筒状金型と、この金型の底部に配置され、これを固
定する固定型とから構成される。前記金属製円筒状金型
は、多数の孔を有し、またその内周面には、ポリテトラ
フルオロエチレン多孔質フィルムが貼着されている。こ
の保形具を、金属製耐熱耐圧容器（水蒸気の導入管とそ
の開閉バルブを備える）に入れ、真空ポンプにより内部
雰囲気圧を１０Ｔｏｒｒとした。この時要した時間は３
０分であった。そして、真空ポンプを停止後、前記バル
ブを開き、水蒸気（温度１６０℃、圧力０．４９ＭＰａ
（５ｋｇ／ｃｍ2））を導入し、このまま１時間加熱焼
結した後、冷却し、円柱状のＵＨＰＥ多孔質体を得た。
この多孔質体を切削旋盤により厚み１７５μｍのシート
状に切削し、気孔率５７体積％のＵＨＰＥ多孔性シート
を得た。このＵＨＰＥ多孔性シートを帯状にカットし、
これをプリーツ加工機によりプリーツ加工し、目的とす
る電池用セパレータを作製した。Example 1 UHPE powder (viscosity average molecular weight: 5,000,000, melting point: 135 ° C., average particle size: 150 μm, mesh classified product) was filled in a shape retainer. The shape retainer includes a metal cylindrical mold and a fixed mold disposed at the bottom of the mold and fixing the mold. The metal cylindrical mold has a large number of holes, and a polytetrafluoroethylene porous film is adhered to an inner peripheral surface thereof. The shape retainer was placed in a metal heat-resistant and pressure-resistant container (including a steam introduction pipe and an opening / closing valve thereof), and the internal atmospheric pressure was adjusted to 10 Torr by a vacuum pump. The time taken at this time was 3
It was 0 minutes. Then, after stopping the vacuum pump, the valve was opened and steam (temperature: 160 ° C., pressure: 0.49 MPa)
(5 kg / cm 2 )), and the mixture was heated and sintered for 1 hour as it was, and then cooled to obtain a columnar UHPE porous body.
This porous body was cut into a sheet having a thickness of 175 μm by a cutting lathe to obtain a UHPE porous sheet having a porosity of 57% by volume. This UHPE porous sheet is cut into a strip,
This was pleated with a pleating machine to produce the intended battery separator.
【００２９】前記電池用セパレータにおいて、その一面
の各凹部に正極を配置し、その他面の各凹部に負極を配
置した。この時、各電極が前記電池用セパレータからは
み出ないように注意し、また各電極の集電部が前記電池
用セパレータの凹部から突出するようにした。そして、
この状態の前記電池用セパレータを、その長手方向に圧
縮し、その幅方向の両縁部を約１７０〜１８０℃に加熱
したプレートに接触させて溶融し、前記各凹部の折り目
方向両端を封止して、目的とする電極群を作製した。こ
の電極群の製造は、効率よく簡単に行うことができた。In the battery separator, a positive electrode was disposed in each concave portion on one surface, and a negative electrode was disposed in each concave portion on the other surface. At this time, care was taken so that each electrode did not protrude from the battery separator, and the current collector of each electrode was made to protrude from the concave portion of the battery separator. And
The battery separator in this state is compressed in the longitudinal direction, and both edges in the width direction are brought into contact with a plate heated to about 170 to 180 ° C. and melted, and both ends of the concave portions in the fold direction are sealed. Thus, an intended electrode group was produced. The production of this electrode group could be performed efficiently and easily.
【００３０】（実施例２）実施例１と同じ方法により、
プリーツ状に屈曲した電池用セパレータを作製した。そ
して、この電池用セパレータを長手方向に圧縮し、その
幅方向の一方の縁部を約１７０〜１８０℃に加熱したプ
レートに接触させて溶融させて各凹部の折り目方向の一
端を封止した。そして、前記電池用セパレータの幅方向
の他方を広げて扇状にし、その一面の各凹部に正極を配
置し、その他面の各凹部に負極を配置した。そして、こ
の電池用セパレータを長手方向に圧縮して扇が閉じた状
態にし、前記幅方向の他方の縁部を前述と同様にして溶
融して各凹部の折り目方向他端を封止した。このように
して、目的とする電極群を作製した。この電極群の製造
は、実施例１よりもさらに効率よく簡単に行うことがで
きた。(Example 2) By the same method as in Example 1,
A battery separator bent in a pleated shape was produced. Then, the battery separator was compressed in the longitudinal direction, and one edge in the width direction was brought into contact with a plate heated to about 170 to 180 ° C. and melted to seal one end of each recess in the fold direction. Then, the other side in the width direction of the battery separator was widened into a fan shape, and the positive electrode was disposed in each concave portion on one surface, and the negative electrode was disposed in each concave portion on the other surface. Then, the battery separator was compressed in the longitudinal direction to make the fan closed, the other edge in the width direction was melted in the same manner as described above, and the other end in the fold direction of each concave portion was sealed. Thus, a desired electrode group was produced. The production of this electrode group could be performed more efficiently and simply than in Example 1.
【００３１】（比較例１）ポリプロピレン不織布製の電
池用セパレータ（厚み約２２０μｍ、市販品）を準備し
た。これについて、実施例１と同様にしてプリーツ加工
を行ったが、プリーツ形状を保持できなかった。Comparative Example 1 A battery separator (thickness: about 220 μm, commercially available) made of a polypropylene nonwoven fabric was prepared. This was pleated in the same manner as in Example 1, but the pleated shape could not be maintained.
【００３２】[0032]
【発明の効果】以上のように、本発明の電池用セパレー
タは、その形状がプリーツ状に屈曲した形状であり、こ
れを用いれば、本発明の電極群を効率よく簡単に製造で
きる。そして、本発明の電極群を用いれば、種々の電
池、特に、多数の電極群を必要とする大型電池（例え
ば、電気自動車の走行用電池）の生産効率の向上および
コストの低減に寄与できる。As described above, the battery separator of the present invention has a pleated shape, and the electrode group of the present invention can be efficiently and easily manufactured by using this. The use of the electrode group of the present invention can contribute to improvement in production efficiency and cost reduction of various batteries, particularly, a large battery (for example, a battery for an electric vehicle) requiring a large number of electrode groups.
【図１】本発明の電池用セパレータの一例の斜視図であ
る。FIG. 1 is a perspective view of an example of a battery separator of the present invention.
【図２】前記電池用セパレータの一面の各凹部に負極を
配置した状態を示す斜視図である。FIG. 2 is a perspective view showing a state in which a negative electrode is arranged in each concave portion on one surface of the battery separator.
【図３】前記電池用セパレータの他面の各凹部に正極を
配置した状態を示す斜視図である。FIG. 3 is a perspective view showing a state in which a positive electrode is arranged in each recess on the other surface of the battery separator.
【図４】前記電池用セパレータの各凹部の折り目方向両
端を封止した状態を示す斜視図である。FIG. 4 is a perspective view showing a state in which both ends in the fold direction of each concave portion of the battery separator are sealed.
【図５】本発明の電池用セパレータのその他の例におい
て、各凹部の折り目方向の一端を封止し、他端を広げた
状態を示す斜視図である。FIG. 5 is a perspective view showing another example of the battery separator of the present invention, in which one end of each concave portion in the fold direction is sealed and the other end is expanded.
１ 電池用セパレータ １ａ 電池用セパレータの幅方向の一方の縁部 ２ 負極 ２ａ 負極の集電部 ３ 正極 ３ａ 正極の集電部 DESCRIPTION OF SYMBOLS 1 Battery separator 1a One edge in the width direction of battery separator 2 Negative electrode 2a Negative current collector 3 Positive electrode 3a Positive current collector
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山村 隆 大阪府茨木市下穂積１丁目１番２号 日東 電工株式会社内 (72)発明者 大谷 彰 大阪府茨木市下穂積１丁目１番２号 日東 電工株式会社内 (72)発明者 宇田 敏 静岡県湖西市境宿555番地 パナソニック イーブイエナジー株式会社内 (72)発明者 森下 展安 静岡県湖西市境宿555番地 パナソニック イーブイエナジー株式会社内 (72)発明者 生駒 宗久 静岡県湖西市境宿555番地 パナソニック イーブイエナジー株式会社内 (72)発明者 岩瀬 正宜 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (72)発明者 関森 俊幸 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 Ｆターム(参考） 5H021 AA06 CC19 EE04 HH07 5H050 AA19 BA11 DA19 ──────────────────────────────────────────────────続 き Continued on the front page (72) Takashi Yamamura, 1-2-1, Shimohozumi, Ibaraki-shi, Osaka Nitto Denko Corporation (72) Akira Otani 1-2-1, Shimohozumi, Ibaraki, Osaka, Japan Nitto Denko Corporation (72) Inventor Satoshi Uda 555 Sakaijuku, Kosai-shi, Shizuoka Prefecture Inside Panasonic Eve Energy Co., Ltd. Inventor Munehisa Ikoma 555 Sakai-shuku, Kosai-shi, Shizuoka Prefecture Inside Panasonic Eve Energy Co., Ltd. (72) Inventor Masanori Iwase 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (72) Inventor Toshiyuki Sekimori Aichi Prefecture 1 Toyota Town, Toyota City F-term in Toyota Motor Corporation (Reference) 5H021 AA06 CC 19 EE04 HH07 5H050 AA19 BA11 DA19
Claims (11)
用セパレータ。1. A battery separator having a pleated shape.
ている請求項１記載の電池用セパレータ。2. The battery separator according to claim 1, wherein the separator is formed from an ultrahigh molecular weight polyolefin.
ータの一面の凹部に一方の電極が配置され、前記電池用
セパレータの他面の凹部に他方の電極が配置されている
電極群。3. An electrode group in which one electrode is disposed in a concave portion on one surface of a battery separator bent in a pleated shape, and the other electrode is disposed in a concave portion on the other surface of the battery separator.
が、前記電極の集電部が前記凹部から突出し、かつ前記
電極のその他の部分が前記電池用セパレータからはみ出
ない状態の配置である請求項３記載の電極群。4. The arrangement of the electrode in the concave portion of the battery separator is such that the current collecting portion of the electrode protrudes from the concave portion and the other portion of the electrode does not protrude from the battery separator. Item 3. An electrode group according to Item 3.
両端が封止されている請求項４記載の電極群。5. The electrode group according to claim 4, wherein both ends in the fold direction of each concave portion of the battery separator are sealed.
レフィンで形成されている請求項３から５のいずれか一
項に記載の電極群。6. The electrode group according to claim 3, wherein the battery separator is formed of an ultra-high molecular weight polyolefin.
ータを準備する工程と、前記電池用セパレータの一面の
凹部に一方の電極を配置し、前記電池用セパレータの他
面の凹部に他方の電極を配置する工程とを有する電極群
の製造方法。7. A step of preparing a pleated battery separator, arranging one electrode in a recess on one surface of the battery separator, and placing the other electrode in a recess on the other surface of the battery separator. And a step of arranging the electrodes.
一端を封止し、他端を広げる工程を有する請求項７記載
の電極群の製造方法。8. The method for producing an electrode group according to claim 7, further comprising the step of sealing one end in the fold direction of each concave portion of the battery separator and expanding the other end.
両端を封止する工程を有する請求項７または８記載の電
極群の製造方法。9. The method of manufacturing an electrode group according to claim 7, further comprising a step of sealing both ends in the fold direction of each concave portion of the battery separator.
の電極を配置し、前記電池用セパレータの他面の凹部に
他方の電極を配置する工程において、前記両電極の配置
が、前記電極の集電部が前記凹部から突出し、かつ前記
電極のその他の部分が前記電池用セパレータからはみ出
ない状態での配置である請求項７から９のいずれか一項
に記載の電極群の製造方法。10. A step of arranging one electrode in a recess on one surface of a battery separator and arranging the other electrode in a recess on the other surface of the battery separator, wherein the arrangement of the two electrodes includes the collection of the electrodes. The method of manufacturing an electrode group according to any one of claims 7 to 9, wherein an electric part protrudes from the concave portion and the other part of the electrode is arranged so as not to protrude from the battery separator.
極群が請求項３から６のいずれか一項に記載の電極群で
ある電池。11. A battery having an electrode group, wherein the electrode group is the electrode group according to any one of claims 3 to 6.
Priority Applications (1)
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|---|---|---|---|
| JP2000354557A JP4880113B2 (en) | 2000-11-21 | 2000-11-21 | Battery separator and electrode group using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000354557A JP4880113B2 (en) | 2000-11-21 | 2000-11-21 | Battery separator and electrode group using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002157990A true JP2002157990A (en) | 2002-05-31 |
| JP4880113B2 JP4880113B2 (en) | 2012-02-22 |
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ID=18827120
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|---|---|---|---|
| JP2000354557A Expired - Lifetime JP4880113B2 (en) | 2000-11-21 | 2000-11-21 | Battery separator and electrode group using the same |
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| JP4880113B2 (en) | 2012-02-22 |
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