JP2768745B2 - Battery separator and battery using the same - Google Patents
Battery separator and battery using the sameInfo
- Publication number
- JP2768745B2 JP2768745B2 JP1196093A JP19609389A JP2768745B2 JP 2768745 B2 JP2768745 B2 JP 2768745B2 JP 1196093 A JP1196093 A JP 1196093A JP 19609389 A JP19609389 A JP 19609389A JP 2768745 B2 JP2768745 B2 JP 2768745B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- separator
- battery
- uncrosslinked
- crosslinked
- 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 - Lifetime
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/411—Organic material
- H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
- H01M50/417—Polyolefins
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/409—Separators, membranes or diaphragms characterised by the material
- H01M50/449—Separators, membranes or diaphragms characterised by the material having a layered structure
- H01M50/457—Separators, membranes or diaphragms characterised by the material having a layered structure comprising three or more layers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
- H01M50/491—Porosity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M6/00—Primary cells; Manufacture thereof
- H01M6/50—Methods or arrangements for servicing or maintenance, e.g. for maintaining operating temperature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
- H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cell Separators (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は電池（例えば、非水電解液電池）およびこの
電池に組み込み、正負両極間を隔離し短絡を防止するた
めのセパレータに関する。Description: TECHNICAL FIELD The present invention relates to a battery (for example, a non-aqueous electrolyte battery) and a separator incorporated in the battery to separate the positive and negative electrodes and prevent a short circuit.
（従来の技術） リチウム等を負極とする非水電解液電池は、高エネル
ギー密度を有すると共に自己放電が少ないので、近年、
大電流用電池として着目されている。(Prior Art) Non-aqueous electrolyte batteries using lithium or the like as a negative electrode have a high energy density and low self-discharge.
It is attracting attention as a high-current battery.
この非水電解液電池は電解液の導電度が低く、大電流
を取り出すために正負両極の面積を大きくする必要があ
り、このため、正負両極間にポリエチレンやポリプロピ
レンから成る不織布をセパレータとして介在せしめ、こ
れらを渦巻状に巻回する渦巻式電極を採用している。In this nonaqueous electrolyte battery, the conductivity of the electrolyte is low, and it is necessary to increase the area of the positive and negative electrodes in order to extract a large current.Therefore, a nonwoven fabric made of polyethylene or polypropylene is interposed between the positive and negative electrodes as a separator. , A spiral electrode for spirally winding them is adopted.
ところで、かような渦巻式電池のような大電流が流れ
る構造の電池にあっては、強制放電等の誤使用に起因し
た外部短絡によって異常電流が流れ、これに伴なって内
部温度が急上昇することがある。By the way, in a battery having a structure in which a large current flows, such as a spiral-wound battery, an abnormal current flows due to an external short-circuit caused by improper use such as forced discharge, and the internal temperature rises rapidly with this. Sometimes.
このような内部温度の上昇があった場合、不織布製セ
パレータを用いていると、このセパレータが軟化乃至溶
融し、正負両極が短絡し、温度が更に上昇し、遂には火
災、爆発という重大事故につながる恐れがあった。If such internal temperature rise occurs, if a nonwoven fabric separator is used, this separator softens or melts, the positive and negative electrodes are short-circuited, the temperature further rises, and finally a serious accident such as fire or explosion occurs. There was a fear of being connected.
かような危険を回避するため、架橋されたポリエチレ
ン多孔質フィルムをセパレータとして用いることが提案
されている（特開昭63−205048号）。In order to avoid such danger, it has been proposed to use a crosslinked polyethylene porous film as a separator (JP-A-63-205048).
架橋されたポリエチレン多孔質フィルムは無数の微孔
を有するため、イオン導電性が良好であり、この点では
セパレータとして好ましいものである。Since the crosslinked polyethylene porous film has countless micropores, it has good ionic conductivity, and is preferable as a separator in this regard.
この架橋されたポリエチレン多孔質フィルムから成る
セパレータは、電池の内部温度が上昇した場合、軟化乃
至溶融して微孔を閉塞し、これによって正負両極間のイ
オン移動を阻止することにより電流を遮断し、温度の過
昇を防止しようとするものである。When the internal temperature of the battery rises, the separator made of the crosslinked polyethylene porous film softens or melts and closes the pores, thereby blocking the ion transfer between the positive and negative electrodes, thereby interrupting the current. , To prevent the temperature from rising excessively.
このセパレータは電池の内部温度上昇時に軟化乃至溶
融を生ずる点では、前記不織布製セパレータと同様であ
るが、架橋されているため、軟化乃至溶融時の粘度が高
く、形状保持性が優れているので、不織布製セパレータ
を用いたときのような正負両極の短絡を生じ難い利点が
ある。This separator is similar to the nonwoven fabric separator in that it softens or melts when the internal temperature of the battery rises, but since it is crosslinked, it has a high viscosity during softening or melting and has excellent shape retention. In addition, there is an advantage that a short circuit between the positive and negative electrodes unlikely to occur when a nonwoven fabric separator is used.
（発明が解決しようとする課題） しかしながら、架橋されたポリエチレン多孔質フィル
ムから成るセパレータは、溶融粘度が高くて流動性に乏
しいため、微孔の閉塞速度が遅く、電流遮断に時間を要
し、温度過昇防止性に難点があり、この点の改良が必要
であった。(Problems to be Solved by the Invention) However, a separator made of a cross-linked polyethylene porous film has a high melt viscosity and poor fluidity, so the closing speed of micropores is slow, and it takes time to interrupt current, There is a problem in the property of preventing excessive temperature rise, and it is necessary to improve this point.
（課題を解決するための手段） 本発明者はかような現状に鑑み鋭意検討の結果、ポリ
エチレン多孔質フィルムの架橋物と未架橋物を積層せし
めたセパレータは下記（１）〜（３）の特徴を有するこ
とを見出し、本発明を完成するに至った。(Means for Solving the Problems) The present inventor has conducted intensive studies in view of the present situation, and as a result, a separator obtained by laminating a crosslinked product and an uncrosslinked product of a polyethylene porous film has the following (1) to (3). The inventors have found that the present invention has features, and have completed the present invention.
（１）異常電流により電池の内部温度が上昇した場合に
は、未架橋のポリエチレン多孔質フィルムが先ず溶融し
て流動し、その溶融粘度が低いので、架橋ポリエチレン
多孔質フィルムの微孔を速やかに充填閉塞し、正負両極
間のイオン移動を阻止して異常電流を遮断できること。(1) When the internal temperature of the battery rises due to the abnormal current, the uncrosslinked polyethylene porous film first melts and flows, and its melt viscosity is low. Capable of blocking the filling, preventing the transfer of ions between the positive and negative electrodes and interrupting the abnormal current.
（２）架橋されたポリエチレン多孔質フィルムは、軟化
乃至溶融した際の粘度が高く、形状保持性が優れてお
り、正負両極の短絡を生じ難いこと。(2) The crosslinked polyethylene porous film has a high viscosity when softened or melted, has excellent shape retention, and is unlikely to cause a short circuit between the positive and negative electrodes.
（３）上記（１）、（２）により温度の過昇は防止され
るので、火災や爆発の危険性が少ないこと。(3) Since the temperature rise is prevented by the above (1) and (2), there is little danger of fire or explosion.
本発明に係る電池用セパレータは、少なくとも２枚の
ポリエチレン多孔質フィルムが積層されており、これら
積層された多孔質フイルムのうちの少なくとも１枚が架
橋されており、且つ少なくとも１枚が未架橋であること
を特徴とするものである。In the battery separator according to the present invention, at least two polyethylene porous films are laminated, at least one of the laminated porous films is crosslinked, and at least one is uncrosslinked. It is characterized by having.
本発明に用いるポリエチレン多孔質フィルムは、通常
の分子量を有するポリエチレンで作成したものであって
も、或いは比較的大きな分子量を有し、「超高分子量ポ
リエチレン」と呼称されるポリエチレンで作成したもの
であってもよく、更に、通常の分子量を有するポリエチ
レンと超高分子量ポリエチレン（以下、UHPEと略称す
る）の混合物から作成したものであってもよい。The polyethylene porous film used in the present invention may be made of polyethylene having a normal molecular weight, or may have a relatively large molecular weight, and may be made of polyethylene called "ultra-high molecular weight polyethylene". Or a mixture of polyethylene having a normal molecular weight and ultrahigh molecular weight polyethylene (hereinafter abbreviated as UHPE).
これらポリエチレンは種々の分子量のものが市販され
ているので容易に入手できる。例えば、UHPEはハイゼッ
クスミリオン（三井石油化学工業社製）、ホスタレンGU
R（ヘキスト社製）等の商品名のものが市販されてい
る。These polyethylenes are commercially available in various molecular weights, so that they can be easily obtained. For example, UHPE is Hyzex Million (Mitsui Petrochemical Co., Ltd.), Hostalen GU
Products with a trade name such as R (manufactured by Hoechst) are commercially available.
本発明はポリエチレンを多孔質化して用いるものであ
るが、ポリエチレン多孔質フィルムの製造法も種々知ら
れており、本発明に用いる多孔質フィルムも、これら公
知の方法（特開昭49−89772号公報、特公昭53−18553号
公報、特開昭62−212463号公報等）で得られたもので差
支えない。In the present invention, polyethylene is used after being made porous. Various methods for producing a polyethylene porous film are also known, and the porous film used in the present invention can also be prepared by a known method (Japanese Patent Laid-Open No. 49-89772). Gazettes, JP-B-53-18553, JP-A-62-212463, etc.).
このポリエチレン多孔質フィルムの物性値は種々設定
できるが、通常、厚さ約10〜50μｍ、微孔の孔径約0.1
〜10μｍ、気孔率約20〜80％である。The physical properties of the polyethylene porous film can be variously set, and usually, the thickness is about 10 to 50 μm, and the pore diameter of the fine pores is about 0.1.
1010 μm, porosity about 20-80%.
本発明は少なくとも１枚の未架橋ポリエチレン多孔質
フィルム（以下、未架橋フィルムと略称する）と、少な
くとも１枚の架橋ポリエチレン多孔質フィルム（以下、
架橋フィルムと略称する）を積層したものであり、積層
物中に未架橋フィルムと架橋フィルムが各々１枚ずつ含
まれるならば、その積層構造は特に限定されない。The present invention relates to at least one uncrosslinked polyethylene porous film (hereinafter abbreviated as an uncrosslinked film) and at least one crosslinked polyethylene porous film (hereinafter, referred to as an uncrosslinked polyethylene film).
A cross-linked film is abbreviated as long as one uncross-linked film and one cross-linked film are included in the laminate.
第１〜３図は、本発明に係る電池用セパレータにおけ
る積層構造の例を示しており、図中１は未架橋フィルム
であり、２は該未架橋フィルム１に積層せしめられた架
橋フィルムである。1 to 3 show examples of a laminated structure in a battery separator according to the present invention. In the drawings, reference numeral 1 denotes an uncrosslinked film, and reference numeral 2 denotes a crosslinked film laminated on the uncrosslinked film 1. .
これら図面に示すセパレータは２層もしくは３層構造
であるが、本発明においては４層以上の多層構造とする
こともできる。Although the separators shown in these drawings have a two-layer or three-layer structure, the present invention may have a multilayer structure of four or more layers.
ただし、積層数の増加によりセパレータが厚くなり、
その電気抵抗が大きくなると共に電池の大型化を招くの
で、これらの点に留意する必要がある。However, the separator becomes thicker due to the increase in the number of layers,
Since the electric resistance increases and the size of the battery increases, it is necessary to pay attention to these points.
本発明は上記した如く、架橋フィルムをその一構成要
素として用いるものであるが、この架橋フィルムは未架
橋フィルムを化学架橋或いは放射線（電子線等）照射架
橋して得ることができる。架橋度は高温に曝された際の
形状保持性の点から、ゲル分率が通常約15％以上好まし
くは30〜90％とする。架橋を電子線照射で行なう場合
は、通常、約１〜100Mradの照射を行なう。As described above, the present invention uses a crosslinked film as one of its constituent elements. This crosslinked film can be obtained by chemically crosslinking an uncrosslinked film or by radiation (electron beam or the like) irradiation crosslinking. The degree of crosslinking is generally about 15% or more, preferably 30 to 90%, in terms of shape retention when exposed to high temperatures. When cross-linking is performed by electron beam irradiation, irradiation of about 1 to 100 Mrad is usually performed.
本発明の電池用セパレータは未架橋フィルムと架橋フ
ィルムを積層せしめた構造を有するものであるが、積層
に際してはイオン導電性を確保するため接着剤の使用は
避けるのが好ましい。The battery separator of the present invention has a structure in which an uncrosslinked film and a crosslinked film are laminated, but it is preferable to avoid the use of an adhesive during lamination in order to secure ionic conductivity.
本発明者の研究により、未架橋フィルムと架橋フィル
ムの積層は、これらフィルムの融点（両フィルムの融点
が異なる場合は、低融点フィルムの融点）以下の特定温
度領域において、両フィルムを重ね合わせて加圧するこ
とにより達成できることが判明した。According to the study of the present inventors, the lamination of an uncrosslinked film and a crosslinked film is performed by laminating both films in a specific temperature region equal to or lower than the melting point of these films (if the melting points of both films are different, the melting point of a low melting point film). It has been found that this can be achieved by applying pressure.
この温度領域は融点をｘ（℃）とすると、〔（ｘ−4
0）〜（ｘ−10）〕℃の範囲であり、また、加圧条件は
約0.01〜10kg/cm（線圧）である。In this temperature range, if the melting point is x (° C.), [(x−4
0) to (x-10)] ° C., and the pressure condition is about 0.01 to 10 kg / cm (linear pressure).
かような条件で作業すると、未架橋フィルムおよび架
橋フィルムの溶融を生せずに、両フィルムを密着一体化
できる。この方法によれば、フィルムが溶融しないの
で、フィルムの微孔閉塞という不都合を生ずることな
く、多孔質フィルム相互を積層できる。ただし、フィル
ム相互の積層強度はそれほどではなく、剥離を防止する
ためにも、製造後の取扱いには注意すべきである。By working under such conditions, both films can be closely adhered and integrated without causing the uncrosslinked film and the crosslinked film to melt. According to this method, the films are not melted, so that the porous films can be laminated with each other without the disadvantage of blocking the pores of the film. However, the lamination strength between the films is not so high, and care should be taken in handling after production to prevent peeling.
本発明のセパレータは従来のセパレータと同様に、正
極と負極の間に介在せしめた状態で用いて電池を組み立
てることができる。The battery of the present invention can be assembled by using the separator of the present invention in a state of being interposed between the positive electrode and the negative electrode, similarly to the conventional separator.
この際の正極、負極、電池ケース、電解液等の材質や
これら構成要素の配置構造も何ら格別なことは要求され
ず、従来と同様でよく、例えば特開昭63−205048号公報
に示される通りであってよい。At this time, the materials of the positive electrode, the negative electrode, the battery case, the electrolytic solution and the like and the arrangement structure of these components are not required to be any particular, and may be the same as conventional ones, for example, as shown in JP-A-63-205048. May be street.
ただし、電池内部においては、架橋フィルムと未架橋
フィルムは積層により一体化していることは必ずしも要
求されず、架橋フィルムと未架橋フィルムは単に重ね合
わされているだけであってもよい。However, inside the battery, the crosslinked film and the uncrosslinked film are not necessarily required to be integrated by lamination, and the crosslinked film and the uncrosslinked film may simply be overlapped.
（実施例） 以下、実施例により本発明を更に詳細に説明する。(Examples) Hereinafter, the present invention will be described in more detail with reference to examples.
実施例１ 平均分子量100万のUHPE（融点136℃）100重量部に対
し、平均分子量20万、密度0.955のポリエチレン（融点1
35℃）33重量部を混合した組成物を用い、厚さ25μｍ、
孔径１μｍ、気孔率60％の未架橋フィルムを得る。Example 1 100 parts by weight of UHPE having an average molecular weight of 1,000,000 (melting point: 136 ° C.), and polyethylene having an average molecular weight of 200,000 and a density of 0.955 (melting point: 1
35 ° C) using a composition obtained by mixing 33 parts by weight, having a thickness of 25 μm,
An uncrosslinked film having a pore size of 1 μm and a porosity of 60% is obtained.
また、この未架橋フィルムに30Mradの電子線を照射
し、ゲル分率40％の架橋フィルム（融点136℃）を得
る。The uncrosslinked film is irradiated with an electron beam of 30 Mrad to obtain a crosslinked film (melting point: 136 ° C.) having a gel fraction of 40%.
次に、未架橋フィルムと架橋フィルムを１枚ずつ重ね
合せ、温度100℃、圧力0.3kg/cm（線圧）の条件でラミ
ネーターにより積層せしめ、第１図と同構造のセパレー
タを得た。Next, the uncrosslinked film and the crosslinked film were laminated one by one, and laminated by a laminator under the conditions of a temperature of 100 ° C. and a pressure of 0.3 kg / cm (linear pressure) to obtain a separator having the same structure as that of FIG.
なお、上記ゲル分率は、先ず、試料を秤量（重量W1）
してフラスコを入れ、これにキシレン（W1の約5000倍）
を加え、温度145℃で約５時間加熱して未架橋分を溶解
せしめ、80メッシュの金網を通してろ別し、金網上のゲ
ル分を温度120℃で２時間乾燥し重量（W2）を秤量し、
下記（Ｉ）式により算出した。The gel fraction was determined by first weighing the sample (weight W 1 ).
To put the flask, which in xylene (about 5000 times the W 1)
And heated at a temperature of 145 ° C. for about 5 hours to dissolve uncrosslinked components, filtered through an 80-mesh wire gauze, dried on a wire mesh at a temperature of 120 ° C. for 2 hours, and weighed (W 2 ). And
It was calculated by the following formula (I).
実施例２ 平均分子量100万のUHPEを用い、厚さ25μｍ、孔径１
μｍ、気孔率60％の未架橋フィルムを得る。 Example 2 Using UHPE having an average molecular weight of 1,000,000, a thickness of 25 μm and a pore size of 1
An uncrosslinked film having a porosity of 60 μm is obtained.
また、この未架橋フィルムに30Mradの電子線を照射
し、ゲル分率40％の架橋フィルムを得る。The uncrosslinked film is irradiated with an electron beam of 30 Mrad to obtain a crosslinked film having a gel fraction of 40%.
次に、未架橋フィルムと架橋フィルムを１枚ずつ重ね
合せ、実施例１と同条件で両フィルムを積層してセパレ
ータを得た。Next, an uncrosslinked film and a crosslinked film were laminated one by one, and both films were laminated under the same conditions as in Example 1 to obtain a separator.
実施例３ 厚さ25μｍ、孔径１μｍ、気孔率55％のポリエチレン
（平均分子量20万）未架橋フィルムを用意する。Example 3 A polyethylene (average molecular weight: 200,000) uncrosslinked film having a thickness of 25 μm, a pore diameter of 1 μm, and a porosity of 55% is prepared.
この未架橋フィルムに30Mradの電子線を照射し、ゲル
分率40％の架橋フィルム（融点135℃）を得る。The uncrosslinked film is irradiated with an electron beam of 30 Mrad to obtain a crosslinked film having a gel fraction of 40% (melting point: 135 ° C.).
次に、未架橋フィルムと架橋フィルムを１枚ずつ重ね
合せ、実施例１と同条件で両フィルムを積層してセパレ
ータを得た。Next, an uncrosslinked film and a crosslinked film were laminated one by one, and both films were laminated under the same conditions as in Example 1 to obtain a separator.
比較例１ 厚さ100μｍの市販のポリエチレン製不織布から成る
セパレータ。Comparative Example 1 A separator made of a commercially available nonwoven fabric made of polyethylene and having a thickness of 100 μm.
比較例２ 実施例１で用いた架橋フィルムのみから成るセパレー
タ。Comparative Example 2 A separator composed of only the crosslinked film used in Example 1.
比較例３ 実施例２で用いた架橋フィルムのみから成るセパレー
タ。Comparative Example 3 A separator composed of only the crosslinked film used in Example 2.
比較例４ 実施例３で用いた架橋フィルムのみから成るセパレー
タ。Comparative Example 4 A separator composed of only the crosslinked film used in Example 3.
これら実施例および比較例のセパレータを用いて非水
電解液電池（渦巻式電極を採用）を作製し、安全性評価
のための短絡試験（各セパレータを用いた電池各々５個
ずつを試験した）を行ない、得られた結果を第４〜６図
に示す。A non-aqueous electrolyte battery (using a spiral electrode) was fabricated using the separators of these Examples and Comparative Examples, and a short-circuit test for safety evaluation was performed (five batteries were tested using each separator). And the obtained results are shown in FIGS.
第４図および第５図中の比較例１および３における
「×」印は電池５個のいずれもが発火したことを示して
いる。また、図示されていないが、第４図の比較例２で
は電池５個中の１個が、第６図の比較例４では電池５個
中の２個が、各々温度約200℃で発火した。従って、比
較例２は電池４個の、比較例４は電池３個のデータを示
している。The "x" mark in Comparative Examples 1 and 3 in FIGS. 4 and 5 indicates that all of the five batteries ignited. Although not shown, one out of five batteries ignited at a temperature of about 200 ° C. in Comparative Example 2 of FIG. 4 and two out of five batteries in Comparative Example 4 of FIG. . Therefore, Comparative Example 2 shows data of four batteries, and Comparative Example 4 shows data of three batteries.
これら第４〜６図から本発明のセパレータおよびこの
セパレータを用いた電池は、短絡後に温度が急速に上昇
しても、発火現象を生ずるようなことがなく、また缶壁
温度（最高到達温度）も低いことが判る。これは未架橋
フィルムが溶融し、架橋フィルムの微孔を閉塞し、電流
を遮断するためである。4 to 6, the separator of the present invention and the battery using this separator do not cause an ignition phenomenon even if the temperature rises rapidly after a short circuit, and the can wall temperature (maximum reached temperature). It turns out that it is also low. This is because the uncrosslinked film melts, closes the micropores of the crosslinked film, and cuts off the current.
（発明の効果） 本発明の電池用セパレータは上記のように構成されて
おり、架橋フィルムと未架橋フィルムを積層せしめたの
で、未架橋フィルムの溶融分により架橋フィルムの微孔
を確実に閉塞でき、温度過昇防止性に優れており、ま
た、このセパレータを組み込んだ電池は、安全性に優れ
ている。(Effect of the Invention) The battery separator of the present invention is configured as described above, and since the crosslinked film and the uncrosslinked film are laminated, the micropores of the crosslinked film can be reliably closed by the molten portion of the uncrosslinked film. Also, the battery incorporating the separator is excellent in safety.
第１〜３図は本発明に係る電池用セパレータの実例を示
す正面図、第４〜６図は本発明に係る電池の特性を示す
グラフである。 １……未架橋フィルム、２……架橋フィルム1 to 3 are front views showing an example of a battery separator according to the present invention, and FIGS. 4 to 6 are graphs showing characteristics of the battery according to the present invention. 1 ... uncrosslinked film 2 ... crosslinked film
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) H01M 2/16──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. 6 , DB name) H01M 2/16
Claims (3)
ルムが積層されており、これら積層された多孔質フィル
ムのうちの少なくとも１枚が架橋されており且つ少なく
とも１枚が未架橋であることを特徴とする電池用セパレ
ータ。An at least two polyethylene porous films are laminated, at least one of the laminated porous films is crosslinked and at least one is uncrosslinked. Battery separator.
子量ポリエチレンから成る請求項１記載の電池用セパレ
ータ。2. The battery separator according to claim 1, wherein at least one of the porous films is made of ultra-high molecular weight polyethylene.
められたセパレータを有し、このセパレータが少なくと
も２枚のポリエチレン多孔質フィルムから成り、これら
多孔質フィルムの少なくとも１枚が架橋されており、且
つ少なくとも１枚が未架橋であることを特徴とする電
池。3. A positive electrode, a negative electrode and a separator interposed between these two electrodes, wherein the separator comprises at least two polyethylene porous films, and at least one of these porous films is cross-linked. A battery characterized in that at least one sheet is uncrosslinked.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1196093A JP2768745B2 (en) | 1989-07-27 | 1989-07-27 | Battery separator and battery using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1196093A JP2768745B2 (en) | 1989-07-27 | 1989-07-27 | Battery separator and battery using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0359947A JPH0359947A (en) | 1991-03-14 |
| JP2768745B2 true JP2768745B2 (en) | 1998-06-25 |
Family
ID=16352098
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1196093A Expired - Lifetime JP2768745B2 (en) | 1989-07-27 | 1989-07-27 | Battery separator and battery using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2768745B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11637311B2 (en) | 2018-01-31 | 2023-04-25 | Lg Chem, Ltd. | Separator, lithium secondary battery including separator, and manufacturing method thereof |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1993013565A1 (en) * | 1991-12-20 | 1993-07-08 | W.R. Grace & Co.-Conn. | Multi-ply battery separator and process of forming |
| CA2085380C (en) * | 1991-12-27 | 2005-11-29 | Celgard Inc. | Porous membrane having single layer structure, battery separator made thereof, preparations thereof and battery equipped with same battery separator |
| DE69407883T2 (en) * | 1993-02-09 | 1998-08-27 | Sumitomo Electric Industries | DIAPHRAGMA FOR CELL AND CELL |
| AU4844596A (en) * | 1995-03-03 | 1996-09-23 | Asahi Kasei Kogyo Kabushiki Kaisha | Microporous polyethylene film and process for producing the film |
| JP4627098B2 (en) * | 1999-10-26 | 2011-02-09 | 日東電工株式会社 | Battery separator and alkaline secondary battery using the same |
| WO2001075991A1 (en) * | 2000-03-31 | 2001-10-11 | Yuasa Corporation | Battery-use separator, battery-use power generating element and battery |
| JP4910230B2 (en) * | 2000-09-28 | 2012-04-04 | 株式会社Ｇｓユアサ | Nonaqueous electrolyte secondary battery |
-
1989
- 1989-07-27 JP JP1196093A patent/JP2768745B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11637311B2 (en) | 2018-01-31 | 2023-04-25 | Lg Chem, Ltd. | Separator, lithium secondary battery including separator, and manufacturing method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0359947A (en) | 1991-03-14 |
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