JP2000100396A - Secondary battery - Google Patents
Secondary batteryInfo
- Publication number
- JP2000100396A JP2000100396A JP10265555A JP26555598A JP2000100396A JP 2000100396 A JP2000100396 A JP 2000100396A JP 10265555 A JP10265555 A JP 10265555A JP 26555598 A JP26555598 A JP 26555598A JP 2000100396 A JP2000100396 A JP 2000100396A
- Authority
- JP
- Japan
- Prior art keywords
- bag
- secondary battery
- adhesive layer
- layer
- terminal
- 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.)
- Pending
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
- Adhesives Or Adhesive Processes (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Secondary Cells (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は二次電池に係り、特
に、小型軽量で気密性に優れた二次電池を得るための二
次電池の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery, and more particularly to an improvement of a secondary battery for obtaining a small, lightweight, and airtight secondary battery.
【０００２】[0002]
【従来の技術】図９に、従来の二次電池１の構造の例を
模式的に示す。図中符号２は金属または樹脂製のケース
で、ケース２内には、一対の正極３ａと負極３ｂとから
なる電極３が、複数個重ねられた状態で、気密的に収容
されている。ここで、正極３ａと負極３ｂとの間、及び
隣接する電極３の間にはそれぞれセパレータ（図示せ
ず。）が介在され、かつ電極３及び／またはセパレータ
には、電解液が含浸されている。また、符号４は、正極
３ａ及び負極３ｂにそれぞれ接続され、ケース２の外部
に延設された端子である。2. Description of the Related Art FIG. 9 schematically shows an example of the structure of a conventional secondary battery 1. In the figure, reference numeral 2 denotes a case made of metal or resin. In the case 2, a plurality of electrodes 3 each composed of a pair of a positive electrode 3a and a negative electrode 3b are housed in an airtight manner in a stacked state. Here, separators (not shown) are interposed between the positive electrode 3a and the negative electrode 3b and between the adjacent electrodes 3, respectively, and the electrodes 3 and / or the separators are impregnated with an electrolytic solution. . Reference numeral 4 is a terminal connected to the positive electrode 3a and the negative electrode 3b, respectively, and extending outside the case 2.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、上記電
池１の場合、ケース２が大型で重いという欠点があっ
た。そこで、上記課題を解決するため、例えば図１０に
示すような二次電池１１が提案されている。この電池１
１は、ケース２に代えて、アルミ箔等が積層されたフィ
ルムを熱シールにより平袋状に成形してなる袋体５を用
いたもので、電極３を袋体５内に収容し、端子４を袋体
５の口部５ａから外部に延設した状態で、口部５ａを端
子４を挟んで熱シ−ルすることにより、袋体５が密閉さ
れる。However, in the case of the battery 1, there is a disadvantage that the case 2 is large and heavy. Therefore, in order to solve the above problem, for example, a secondary battery 11 as shown in FIG. 10 has been proposed. This battery 1
Reference numeral 1 denotes a case in which, instead of the case 2, a bag 5 formed by forming a film on which aluminum foil or the like is laminated into a flat bag by heat sealing is used. The bag 5 is hermetically sealed by heat-sealing the mouth 5a with the terminal 4 interposed therebetween while the bag 4 is extended from the mouth 5a of the bag 5 to the outside.
【０００４】しかしながら、この電池１１の場合、小型
化及び軽量化の点では優れるものの、端子４を形成する
金属と袋体５を形成するフィルムとの、口部５ａの熱シ
ール時における接着性が低いため、この接着部分から電
解液が漏れたり、水分や空気が袋体５内に侵入する等し
て、電池１１の性能が低下するという欠点があった。本
発明は上記事情に鑑みてなされたもので、小型軽量で気
密性に優れた二次電池を得ることをその目的としてい
る。However, although the battery 11 is excellent in terms of miniaturization and weight reduction, the adhesion between the metal forming the terminal 4 and the film forming the bag body 5 at the time of heat sealing of the mouth 5a is low. Since the battery 11 is low, there is a drawback that the performance of the battery 11 is deteriorated due to leakage of the electrolyte from the adhesive portion, penetration of moisture or air into the bag 5 and the like. The present invention has been made in view of the above circumstances, and has as its object to obtain a small, lightweight, and airtight secondary battery.
【０００５】[0005]
【課題を解決するための手段】本発明は、外側から、保
護層、水蒸気不透過層、電気絶縁層、及び接着層からな
り、電解液を収容する袋体と、上記接着層に挟まれて上
記袋体の口部に溶着される、テープ状をなす金属製の端
子とを有する二次電池であって、上記接着層が、極性基
を有するポリオレフィン系樹脂からなることを特徴とし
ている。According to the present invention, a protective layer, a water vapor impermeable layer, an electric insulating layer, and an adhesive layer are provided from the outside, and a bag containing an electrolytic solution is sandwiched between the adhesive layer and the bag. A secondary battery having a tape-shaped metal terminal that is welded to the mouth of the bag body, wherein the adhesive layer is made of a polyolefin resin having a polar group.
【０００６】ここで、ポリオレフィン系樹脂がポリプロ
ピレンであることが望ましい。更に望ましくは、上記ポ
リオレフィン系樹脂を、ポリオレフィンに無水マレイン
酸をグラフト共重合させた樹脂とする。Here, it is desirable that the polyolefin resin is polypropylene. More preferably, the polyolefin resin is a resin obtained by graft copolymerizing maleic anhydride with a polyolefin.
【０００７】また、上記接着層の厚みは、上記端子の厚
みの１／２以上であることが望ましい。It is desirable that the thickness of the adhesive layer is at least half the thickness of the terminal.
【０００８】更に、上記水蒸気不透過層の厚みは、２０
μｍ以上であることが望ましい。Further, the thickness of the water vapor impermeable layer is 20
It is desirable that it is not less than μm.
【０００９】一方、上記袋体は、ガゼット袋であること
が望ましい。On the other hand, it is desirable that the bag is a gusset bag.
【００１０】[0010]
【発明の実施の形態】以下、図面に基づき、本発明の実
施の形態について説明する。図１に、本発明に係る二次
電池２１の形状の例を、また、その構造を図２に示す。
図中符号６は袋体で、袋体６は、後述する図３に示すよ
うな構造を有するフィルムを、接着層６４の形成面が袋
体６の内面となるよう、直方体状をなす、いわゆるガゼ
ット袋に製袋したものである。また、袋体６は、図１に
示すように、接合部を袋体６の隅部に設け、かつ他の隅
部を、上記接合部と同様、柱状にシールすることによ
り、袋体６の四隅にそれぞれシール部６ｂを有する構造
とする。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of the shape of the secondary battery 21 according to the present invention, and FIG. 2 shows its structure.
In the figure, reference numeral 6 denotes a bag, and the bag 6 is a so-called rectangular parallelepiped film formed of a film having a structure as shown in FIG. It is made in a gusset bag. As shown in FIG. 1, the bag 6 is provided with a joint at a corner of the bag 6 and seals the other corners in a columnar shape in the same manner as the above-mentioned joint. A structure having seal portions 6b at four corners is adopted.
【００１１】上記フィルムの構造を図３に示す。このフ
ィルムは、図３中上方から、保護層６１、水蒸気不透過
層６２、電気絶縁層６３、及び接着層６４から構成され
ている。水蒸気不透過層６２には、例えばアルミ等の金
属箔が使用され、また、電気絶縁層６３には、電気絶縁
性及び強度に優れ、かつ接着層６４より高融点の、例え
ばＰＥＴやナイロン等の樹脂が使用される。保護層６１
は、水蒸気不透過層６２を保護するためのもので、例え
ばＰＥＴやナイロン、ポリプロピレン等の樹脂が使用さ
れる。FIG. 3 shows the structure of the film. This film includes a protective layer 61, a water vapor impermeable layer 62, an electric insulating layer 63, and an adhesive layer 64 from above in FIG. For the water vapor impervious layer 62, a metal foil such as aluminum is used. For the electric insulating layer 63, for example, PET or nylon, which has excellent electric insulation and strength and has a higher melting point than the adhesive layer 64. Resin is used. Protective layer 61
Is for protecting the water vapor impermeable layer 62, and is made of, for example, a resin such as PET, nylon, or polypropylene.
【００１２】一方、接着層６４には、袋体６の口部６ａ
を熱シールした際に、後述する端子を構成する金属に対
し接着性を有し、かつ袋体６内に封入される電解液に対
し耐食性を有する材質が使用される。このような材質と
しては、カルボキシル基、カルボン酸無水物基、エポキ
シ基、あるいはアルコキシシラン基のような極性基を有
するポリオレフィン系樹脂、具体的には、無水マレイン
酸のグラフト共重合またはランダム共重合により酸変性
されたポリオレフィン系樹脂が挙げられる。また、上記
ポリオレフィン系樹脂としては、例えば、ポリプロピレ
ン、ポリエチレン、エチレン−酢酸ビニル共重合体等が
使用可能であるが、耐熱性に優れ、かつ安価である点か
ら、ポリプロピレンを使用することが望ましい。On the other hand, the adhesive layer 64 is provided with a mouth 6a of the bag body 6.
When heat-sealing is performed, a material having adhesiveness to a metal constituting a terminal described later and having corrosion resistance to an electrolytic solution sealed in the bag body 6 is used. Examples of such a material include a polyolefin resin having a polar group such as a carboxyl group, a carboxylic anhydride group, an epoxy group, or an alkoxysilane group, specifically, graft copolymerization or random copolymerization of maleic anhydride. And a polyolefin resin modified by acid. As the polyolefin-based resin, for example, polypropylene, polyethylene, ethylene-vinyl acetate copolymer, or the like can be used. However, it is preferable to use polypropylene because it is excellent in heat resistance and inexpensive.
【００１３】袋体６内には、上記従来の電池１，１１に
使用されているものと同様の、全体として直方体状をな
す電極３が収容され、かつ上記電極３には、端子４が接
続されている。端子４は、アルミニウムに代表される金
属をテープ状に成形したもので、その表裏面は、口部６
ａのシール面と平行とされている。そして、口部６ａ
を、端子４を挟んで熱シールすることにより、袋体６が
密閉されている。In the bag 6, an electrode 3 having a rectangular parallelepiped shape similar to that used in the conventional batteries 1 and 11 is housed, and a terminal 4 is connected to the electrode 3. Have been. The terminal 4 is formed by molding a metal represented by aluminum into a tape shape.
a is parallel to the sealing surface. And the mouth 6a
Is thermally sealed with the terminal 4 interposed therebetween, so that the bag body 6 is sealed.
【００１４】ここで、水蒸気不透過層６２に使用される
金属箔の厚みは、２０μｍ以上であることが望ましい。
これは、上記金属箔の厚みが２０μｍ未満だと、金属箔
に微細なピンホール等が生じやすく、水蒸気や気体を確
実に遮断できなくなる可能性があるためである。Here, the thickness of the metal foil used for the water vapor impermeable layer 62 is desirably 20 μm or more.
This is because if the thickness of the metal foil is less than 20 μm, fine pinholes or the like are likely to occur in the metal foil, and it may not be possible to reliably shut off water vapor or gas.
【００１５】また、接着層６４の厚みは、端子４の厚み
の１／２以上であることが望ましい。これは、接着層６
４の厚みが端子４の厚みの１／２未満だと、端子４を挟
んで熱シールした際に、表裏の接着層６４によって端子
４が完全に包囲されず、その結果、上記シール面のう
ち、接着層６４同士の接着部と、接着層６４と端子４の
接着部との境界部（図１中符号Ｄで示す箇所）に微細な
隙間が生じ、そこから電解液が漏洩する可能性があるた
めである。It is desirable that the thickness of the adhesive layer 64 be at least half the thickness of the terminal 4. This is the adhesive layer 6
If the thickness of the terminal 4 is less than １ ／ of the thickness of the terminal 4, the terminal 4 is not completely surrounded by the adhesive layers 64 on the front and back sides when the terminal 4 is heat-sealed. There is a possibility that a minute gap is formed at the bonding portion between the bonding layers 64 and at the boundary between the bonding portion of the bonding layer 64 and the bonding portion of the terminal 4 (location indicated by reference symbol D in FIG. 1), and the electrolyte may leak therefrom. Because there is.
【００１６】更に、水蒸気不透過層６２と接着層６４と
の間に電気絶縁層６３を設けた理由は、熱シールに伴
い、端子との当接部分にて接着層６４が薄くなった場合
における、水蒸気不透過層６２と端子４との導通を、電
気絶縁性及び強度に優れ、かつ接着層６４より高融点の
材質で形成された電気絶縁層６３により防止するためで
ある。Further, the reason why the electrical insulating layer 63 is provided between the water vapor impermeable layer 62 and the adhesive layer 64 is that the adhesive layer 64 becomes thinner at the contact portion with the terminal due to heat sealing. This is because the electrical continuity between the water vapor impermeable layer 62 and the terminal 4 is prevented by the electrical insulating layer 63 which is excellent in electrical insulation and strength and is formed of a material having a higher melting point than the adhesive layer 64.
【００１７】この二次電池２１は、外殻を袋体６で形成
したため、小型化及び軽量化の点で優れている。しか
も、袋体６の内面に、口部６ａを熱シールした際に端子
４を構成する金属に対し接着性を有する接着層６４を形
成したため、口部６ａにおける、端子４と袋体６との接
着部分からの電解液の漏洩や、水分や気体の袋体６内へ
の侵入が防止される。従って、この二次電池２１によれ
ば、端子４と袋体６との接着不良に伴う袋体６の密閉性
低下と、それに起因する二次電池２１の性能低下が防止
される。Since the outer shell is formed by the bag 6, the secondary battery 21 is excellent in miniaturization and weight reduction. In addition, since the adhesive layer 64 having an adhesive property to the metal constituting the terminal 4 when the mouth 6a is heat-sealed is formed on the inner surface of the bag 6, the connection between the terminal 4 and the bag 6 in the mouth 6a is formed. Leakage of the electrolyte from the bonding portion and intrusion of moisture or gas into the bag 6 are prevented. Therefore, according to the secondary battery 21, a decrease in the hermeticity of the bag 6 due to poor adhesion between the terminal 4 and the bag 6 and a decrease in performance of the secondary battery 21 due to the reduction are prevented.
【００１８】また、端子４がテープ状をなし、かつその
表裏面が口部６ａのシール面と平行とされているため、
口部６ａを端子４を挟んで熱シールした際に、端子４の
厚みにより上記境界部Ｄに形成される段差が少なくて済
み、その結果、袋体６が一層確実に密閉される。加え
て、接着層６４を構成する樹脂が熱シールに伴い溶融し
て上記段差部に侵入し、上記段差部に形成された隙間を
封止するため、袋体６の密閉性が更に向上する。Further, since the terminal 4 has a tape shape and its front and back surfaces are parallel to the sealing surface of the mouth 6a,
When the mouth 6a is heat-sealed with the terminal 4 interposed therebetween, the step formed at the boundary portion D is small due to the thickness of the terminal 4, and as a result, the bag 6 is more securely sealed. In addition, the resin forming the adhesive layer 64 is melted by the heat sealing and enters the step, and seals the gap formed in the step, so that the airtightness of the bag 6 is further improved.
【００１９】しかも、袋体６が水蒸気不透過層６２を有
するため、袋体６の側面を介して、袋体６内に水蒸気や
気体が侵入することはない。また、端子４または電極３
と水蒸気不透過層６２との間の電気絶縁性は、両者間に
おける電気絶縁層６３及び接着層６４の存在により確保
される。Moreover, since the bag 6 has the water vapor impermeable layer 62, no water vapor or gas enters the bag 6 through the side surface of the bag 6. Also, terminal 4 or electrode 3
The electrical insulation between the and the water vapor impermeable layer 62 is ensured by the presence of the electrical insulating layer 63 and the adhesive layer 64 between them.
【００２０】一方、袋体６が直方体状をなすガゼット袋
とされているため、図２に示すような、ある程度の厚み
を有する電極３を収容する場合でも、電極３を、袋体６
に不要なストレスをかけることなく容易に収容可能で、
かつ収容された電極３の角部との当たりによる袋体６の
損傷も起こりにくい。また、袋体６の表面積が小さく、
かつ袋体６が直方体をなしているため、複数の二次電池
２１をまとめて容器等に収納した場合における収納効率
が向上する。なお、上記効果を得るためには、袋体６の
形状は、ガゼット袋のみならず、少なくとも直方体状を
なしていればよい。On the other hand, since the bag body 6 is a gusset bag having a rectangular parallelepiped shape, even when the electrode 3 having a certain thickness as shown in FIG.
Can be easily accommodated without putting unnecessary stress on
In addition, damage to the bag 6 due to contact with the corners of the accommodated electrodes 3 is unlikely to occur. In addition, the surface area of the bag 6 is small,
In addition, since the bag 6 has a rectangular parallelepiped shape, the storage efficiency when a plurality of secondary batteries 21 are collectively stored in a container or the like is improved. In order to obtain the above effect, the shape of the bag body 6 is not limited to the gusset bag, and may be at least a rectangular parallelepiped.
【００２１】更に、図１に示すように、袋体６の四隅に
シール部分６ｂを設けた場合には、袋体６の側面がこれ
らシール部６ｂにより保護されるため、二次電池２１を
容器等に収容した際に、袋体６の側面が容器等に直接接
触せず、接触や擦過によるピンホール等が発生しにくい
という効果が得られる。また、シール部６ｂによる袋体
６の側面の保護が不要な場合には、図４に示すように、
接合部（シール部）６ｂを袋体６の側面に設けてもよ
い。Further, as shown in FIG. 1, when the sealing portions 6b are provided at the four corners of the bag 6, the side surfaces of the bag 6 are protected by the sealing portions 6b. When the bag 6 is accommodated in a container or the like, the side surface of the bag 6 does not directly contact the container or the like, so that an effect that pinholes or the like due to contact or rubbing hardly occurs is obtained. When it is not necessary to protect the side surface of the bag body 6 with the seal portion 6b, as shown in FIG.
The joining portion (seal portion) 6 b may be provided on the side surface of the bag body 6.
【００２２】[0022]
【実施例】以下に実施例を示し、本発明の効果について
説明する。 １．接着層の厚さの比較 いずれも極性基を有するポリオレフィン系樹脂からなる
接着層を有し、かつ接着層の厚さが異なる各種ラミネー
トフィルムを用意し、これらのフィルムにより、５０×
１００×３００（ｍｍ）の直方体状をなすガゼット袋を
それぞれ作成し、これらの袋体内に、セパレータを介在
させた正負電極及び電解液（導電材を非水分散媒に分散
させ、更に色素を混入したもの）を入れ、正負電極から
それぞれ延びるテープ状の端子（アルミニウム製、厚さ
１００μｍ）を介在させた状態で、袋体の口部を熱板で
挟んでヒートシール（両面、温度２００°にて３秒、シ
ール圧２ｋｇ）し、各種の電池を得た。そして、これら
の電池を、それぞれ濾紙に包んで６０℃のオーブン内に
て２時間放した置後、濾紙への色素の転写の有無から液
漏れを検査するとともに、端子シール部分における絶縁
性を、テスターを用いて調査した。また、試料数は各１
０個とした。EXAMPLES Examples will be shown below to explain the effects of the present invention. 1. Comparison of Adhesive Layer Thickness All have an adhesive layer made of a polyolefin-based resin having a polar group, and prepare various laminated films having different adhesive layer thicknesses.
Gazette bags each having a rectangular parallelepiped shape of 100 × 300 (mm) are prepared, and positive and negative electrodes and an electrolytic solution (a conductive material is dispersed in a non-aqueous dispersion medium with a separator interposed therebetween, and a dye is further mixed in these bags). With the tape-shaped terminals (aluminum, thickness 100 μm) extending from the positive and negative electrodes interposed therebetween, and heat-sealing the both sides of the bag with a hot plate (both sides, at a temperature of 200 °). For 3 seconds and a sealing pressure of 2 kg) to obtain various batteries. After wrapping each of these batteries in filter paper and leaving them in an oven at 60 ° C. for 2 hours, the battery was inspected for liquid leakage from the presence or absence of dye transfer to the filter paper, and the insulation at the terminal seal portion was checked. The investigation was performed using a tester. The number of samples is 1 for each.
The number was set to 0.
【００２３】供試した各種フィルムの構成を図５に、ま
た、液漏れ及び絶縁性の調査結果を図６にそれぞれ示
す。図６に示す通り、接着層の厚さが端子の厚さの１／
２以上で、かつ電気絶縁層を有する実施例では、液漏
れ、絶縁不良とも生じなかったのに対し、接着層の厚さ
が端子の厚さの１／２未満である比較例１では液漏れが
生じ、電気絶縁層を有さない比較例２では、絶縁不良が
生じた。FIG. 5 shows the structure of each of the tested films, and FIG. 6 shows the results of the liquid leakage and the insulating properties. As shown in FIG. 6, the thickness of the adhesive layer is 1 / th of the thickness of the terminal.
In the embodiment having two or more layers and the electric insulating layer, neither the liquid leakage nor the insulation failure occurred. On the other hand, in the comparative example 1 in which the thickness of the adhesive layer was less than half the thickness of the terminal, the liquid leakage occurred. Occurred, and in Comparative Example 2 having no electrical insulating layer, insulation failure occurred.
【００２４】２．接着層材質の比較 接着層の材質が異なる各種ラミネートフィルムにより上
記ガゼット袋をそれぞれ作成し、これらの袋体を外殻と
した電池を用い、上記方法にて液漏れを検査するととも
に、放置後のシール部分の接着強度を調査した。また、
接着層以外のフィルムの組成は上記実施例１と同様と
し、試料数は各１０個とした。2. Comparison of adhesive layer materials The above-mentioned gusset bags were made of various laminated films having different adhesive layer materials, and using a battery having these bags as outer shells, inspecting for liquid leakage by the above method, The adhesive strength of the seal was investigated. Also,
The composition of the film other than the adhesive layer was the same as in Example 1 above, and the number of samples was 10 each.
【００２５】供試した各種フィルムにおける接着層の材
質を図７に、また、液漏れ及び接着強度の調査結果を図
８にそれぞれ示す。図８の結果から、接着層が極性基を
有するポリオレフィン系樹脂で形成された実施例では、
液漏れが生じず、接着強度も高かったのに対し、接着層
が極性基を有さない比較例では、液漏れが生じ、接着強
度も低かった。FIG. 7 shows the material of the adhesive layer in each of the tested films, and FIG. 8 shows the results of the investigation of the liquid leakage and the adhesive strength. From the results of FIG. 8, in the example in which the adhesive layer was formed of a polyolefin resin having a polar group,
No liquid leakage occurred and the adhesive strength was high, whereas in the comparative example where the adhesive layer did not have a polar group, liquid leakage occurred and the adhesive strength was low.
【００２６】[0026]
【発明の効果】以上説明した通り、本発明に係る二次電
池は、外殻を袋体で形成したため、小型化及び軽量化の
点で優れている。しかも、袋体の内面に、袋体の口部を
熱シールした際に、端子を形成する金属に対し接着性を
有する接着層を形成したため、口部における、端子と袋
体との接着部分からの電解液の漏洩や、水分や気体の袋
体への侵入が防止される。従って、この二次電池によれ
ば、端子と袋体との接着不良に伴う袋体の密閉性低下
と、それに起因する性能低下が防止される。As described above, the secondary battery according to the present invention is excellent in miniaturization and weight reduction because the outer shell is formed of a bag. In addition, when the mouth of the bag is heat-sealed on the inner surface of the bag, an adhesive layer having an adhesive property to the metal forming the terminal is formed. Of the electrolyte solution and intrusion of moisture or gas into the bag. Therefore, according to this secondary battery, it is possible to prevent a decrease in the airtightness of the bag due to poor adhesion between the terminal and the bag, and a decrease in performance due to the decrease.
【図１】 本発明に係る二次電池の形状の例を示す上方
斜視図である。FIG. 1 is a top perspective view showing an example of the shape of a secondary battery according to the present invention.
【図２】 本発明に係る二次電池の構造の例を示す図１
中ＩＩ−ＩＩ線に沿った断面図である。FIG. 2 shows an example of the structure of a secondary battery according to the present invention.
FIG. 2 is a sectional view taken along line II-II.
【図３】 本発明に係る二次電池の袋体に使用されるフ
ィルムの構造の例を示す断面図である。FIG. 3 is a cross-sectional view showing an example of a structure of a film used for a bag of a secondary battery according to the present invention.
【図４】 本発明に係る二次電池の形状の例を示す上方
斜視図である。FIG. 4 is a top perspective view showing an example of a shape of a secondary battery according to the present invention.
【図５】 本発明の実施例に供試したフィルムの構成を
示す図である。FIG. 5 is a diagram showing a configuration of a film used in an example of the present invention.
【図６】 本発明の実施例における液漏れ及び絶縁性の
調査結果を示す図である。FIG. 6 is a diagram showing a result of an investigation on liquid leakage and insulating properties in an example of the present invention.
【図７】 本発明の実施例に供試したフィルムにおける
接着層の材質を示す図である。FIG. 7 is a view showing a material of an adhesive layer in a film tested in an example of the present invention.
【図８】 本発明の実施例における液漏れ及び接着強度
の調査結果を示す図である。FIG. 8 is a diagram showing the results of an investigation on liquid leakage and adhesive strength in an example of the present invention.
【図９】 従来の二次電池の構造の例を示す断面図であ
る。FIG. 9 is a cross-sectional view illustrating an example of the structure of a conventional secondary battery.
【図１０】 従来の二次電池の構造の例を示す断面図で
ある。FIG. 10 is a cross-sectional view illustrating an example of the structure of a conventional secondary battery.
３ 電極 ４ 端子 ６ 袋体 ６ａ 口部 ２１ 二次電池 ６２ 水蒸気不透過層 ６３ 電気絶縁層 ６４ 接着層 DESCRIPTION OF SYMBOLS 3 electrode 4 terminal 6 bag 6a mouth 21 rechargeable battery 62 water vapor impermeable layer 63 electric insulating layer 64 adhesive layer
【手続補正書】[Procedure amendment]
【提出日】平成１０年１０月６日（１９９８．１０．
６）[Submission date] October 6, 1998 (1998.10.
6)
【手続補正１】[Procedure amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００２１[Correction target item name] 0021
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【００２１】更に、図１に示すように、袋体６の四隅に
シール部６ｂを設けた場合には、袋体６の側面がこれら
シール部６ｂにより保護されるため、二次電池２１を容
器等に収容した際に、袋体６の側面が容器等に直接接触
せず、接触や擦過によるピンホール等が発生しにくいと
いう効果が得られる。また、シール部６ｂによる袋体６
の側面の保護が不要な場合には、図４に示すように、接
合部（シール部）６ｂを袋体６の側面に設けてもよい。Furthermore, as shown in FIG. 1, when the sealing portion 6b is provided at the four corners of the bag 6, the side surfaces of the bag 6 is protected by these sealing portions 6b, the container of the secondary battery 21 When the bag 6 is accommodated in a container or the like, the side surface of the bag 6 does not directly contact the container or the like, so that an effect that pinholes or the like due to contact or rubbing hardly occurs is obtained. In addition, the bag 6 formed by the sealing portion 6b
When the protection of the side surface is unnecessary, a joint (seal portion) 6b may be provided on the side surface of the bag body 6 as shown in FIG.
【手続補正２】[Procedure amendment 2]
【補正対象書類名】図面[Document name to be amended] Drawing
【補正対象項目名】図８[Correction target item name] Fig. 8
【補正方法】変更[Correction method] Change
【補正内容】[Correction contents]
【図８】 FIG. 8
Claims (6)
気絶縁層、及び接着層からなり、電解液を収容する袋体
と、上記接着層に挟まれて上記袋体の口部に溶着され
る、テープ状をなす金属製の端子とを有する二次電池で
あって、 上記接着層が、極性基を有するポリオレフィン系樹脂か
らなることを特徴とする二次電池。1. A bag, comprising a protective layer, a water vapor impermeable layer, an electric insulating layer, and an adhesive layer, containing an electrolytic solution, and welded to the mouth of the bag sandwiched between the adhesive layers. Wherein the adhesive layer is made of a polyolefin-based resin having a polar group.
レンであることを特徴とする請求項１に記載の二次電
池。2. The secondary battery according to claim 1, wherein the polyolefin resin is polypropylene.
フィンに無水マレイン酸をグラフト共重合させた樹脂で
あることを特徴とする請求項１または２に記載の二次電
池。3. The secondary battery according to claim 1, wherein the polyolefin resin is a resin obtained by graft copolymerizing maleic anhydride with polyolefin.
／２以上であることを特徴とする請求項１ないし３のい
ずれか１項に記載の二次電池。4. The thickness of the adhesive layer is one of the thickness of the terminal.
The secondary battery according to any one of claims 1 to 3, wherein the ratio is at least / 2.
以上であることを特徴とする請求項１ないし４のいずれ
か１項に記載の二次電池。5. The thickness of the water vapor impermeable layer is 20 μm.
The rechargeable battery according to any one of claims 1 to 4, wherein:
とする請求項１ないし５のいずれか１項に記載の二次電
池。6. The secondary battery according to claim 1, wherein the bag is a gusset bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10265555A JP2000100396A (en) | 1998-09-18 | 1998-09-18 | Secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10265555A JP2000100396A (en) | 1998-09-18 | 1998-09-18 | Secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000100396A true JP2000100396A (en) | 2000-04-07 |
Family
ID=17418745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10265555A Pending JP2000100396A (en) | 1998-09-18 | 1998-09-18 | Secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000100396A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956853A (en) * | 2012-10-26 | 2013-03-06 | 合肥恒能新能源科技有限公司 | Lithium ion battery |
| WO2016194093A1 (en) * | 2015-05-29 | 2016-12-08 | リンテック株式会社 | Adhesive sheet |
| JP2017174555A (en) * | 2016-03-22 | 2017-09-28 | トヨタ自動車株式会社 | Laminate battery |
| JP2019040820A (en) * | 2017-08-28 | 2019-03-14 | 大日本印刷株式会社 | Battery case and battery |
| CN109950609A (en) * | 2017-12-20 | 2019-06-28 | 成都市银隆新能源有限公司 | Liquid storage gummed paper, preparation method and battery core for lithium ion soft pack cell |
| US10629857B2 (en) | 2015-02-12 | 2020-04-21 | Semiconductor Energy Laboratory Co., Ltd. | Secondary battery and electronic device |
| CN112771697A (en) * | 2020-03-09 | 2021-05-07 | 宁德新能源科技有限公司 | Battery cell and battery with same |
| US11417911B2 (en) | 2018-12-05 | 2022-08-16 | Toyota Jidosha Kabushiki Kaisha | All-solid-state battery and method for producing the same |
| JP7509113B2 (en) | 2021-10-15 | 2024-07-02 | トヨタ自動車株式会社 | Laminated Battery |
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| JPH10214606A (en) * | 1996-11-28 | 1998-08-11 | Sanyo Electric Co Ltd | Thin type battery of laminated armor body |
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| JPS5921565U (en) * | 1982-07-30 | 1984-02-09 | 凸版印刷株式会社 | Outer packaging material for flat thin lithium batteries |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956853A (en) * | 2012-10-26 | 2013-03-06 | 合肥恒能新能源科技有限公司 | Lithium ion battery |
| US11258142B2 (en) | 2015-02-12 | 2022-02-22 | Semiconductor Energy Laboratory Co., Ltd. | Secondary battery and electronic device |
| US10629857B2 (en) | 2015-02-12 | 2020-04-21 | Semiconductor Energy Laboratory Co., Ltd. | Secondary battery and electronic device |
| WO2016194093A1 (en) * | 2015-05-29 | 2016-12-08 | リンテック株式会社 | Adhesive sheet |
| JPWO2016194093A1 (en) * | 2015-05-29 | 2017-06-15 | リンテック株式会社 | Adhesive sheet |
| US10550289B2 (en) | 2015-05-29 | 2020-02-04 | Lintec Corporation | Pressure sensitive adhesive sheet |
| CN113402999A (en) * | 2015-05-29 | 2021-09-17 | 琳得科株式会社 | Adhesive sheet |
| JP2017174555A (en) * | 2016-03-22 | 2017-09-28 | トヨタ自動車株式会社 | Laminate battery |
| JP2019040820A (en) * | 2017-08-28 | 2019-03-14 | 大日本印刷株式会社 | Battery case and battery |
| CN109950609A (en) * | 2017-12-20 | 2019-06-28 | 成都市银隆新能源有限公司 | Liquid storage gummed paper, preparation method and battery core for lithium ion soft pack cell |
| CN109950609B (en) * | 2017-12-20 | 2024-03-15 | 成都市银隆新能源有限公司 | Liquid storage gummed paper for lithium ion soft package battery core, preparation method and battery core |
| US11417911B2 (en) | 2018-12-05 | 2022-08-16 | Toyota Jidosha Kabushiki Kaisha | All-solid-state battery and method for producing the same |
| WO2021179129A1 (en) * | 2020-03-09 | 2021-09-16 | 宁德新能源科技有限公司 | Cell and battery having said cell |
| CN112771697B (en) * | 2020-03-09 | 2023-07-18 | 宁德新能源科技有限公司 | Battery cell and battery with same |
| CN112771697A (en) * | 2020-03-09 | 2021-05-07 | 宁德新能源科技有限公司 | Battery cell and battery with same |
| JP7509113B2 (en) | 2021-10-15 | 2024-07-02 | トヨタ自動車株式会社 | Laminated Battery |
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