JP2000251856A - Secondary battery - Google Patents
Secondary batteryInfo
- Publication number
- JP2000251856A JP2000251856A JP11051887A JP5188799A JP2000251856A JP 2000251856 A JP2000251856 A JP 2000251856A JP 11051887 A JP11051887 A JP 11051887A JP 5188799 A JP5188799 A JP 5188799A JP 2000251856 A JP2000251856 A JP 2000251856A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- secondary battery
- bag
- insulating 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Sealing Battery Cases Or Jackets (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、小型軽量で密閉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 in a secondary battery for obtaining a small, lightweight, and highly sealed secondary battery.
【０００２】[0002]
【従来の技術】図７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。更に、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. 7 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. Furthermore, a separator (not shown) is interposed between the positive electrode 3a and the negative electrode 3b and between the adjacent electrodes 3, 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は、ケース２が大型で重いという欠点を有してい
る。そこで、上記課題を解決するため、例えば図８に示
すような電池１１が提案されている。この電池１１は、
ケース２に代えて、アルミ箔等の水蒸気不透過層が積層
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。この電池１１によれば、外殻を袋体５
で形成したため、上記電池１に比して、大幅な小型化及
び軽量化が可能となる。However, the battery 1 has a disadvantage that the case 2 is large and heavy. Therefore, in order to solve the above problem, for example, a battery 11 as shown in FIG. 8 has been proposed. This battery 11
Instead of the case 2, a bag 5 is used in which a film in which a water vapor impermeable layer such as an aluminum foil is laminated is formed into a flat bag by heat sealing, and the electrode 3 is housed in the bag 5. When the terminal 4 is extended from the mouth 5a of the bag 5 to the outside, the bag 5 is hermetically sealed by heat sealing the mouth 5a with the terminal 4 interposed therebetween. According to the battery 11, the outer shell is made of the bag 5.
Since the battery 1 is formed, the size and weight can be significantly reduced as compared with the battery 1 described above.
【０００４】ところで、上記電池１１では、水蒸気不透
過層と端子４との接触を避けるため、水蒸気不透過層の
内側に電気絶縁層を設ける必要がある。しかしながら、
水蒸気不透過層と電気絶縁層とが接着剤で接着されてい
るため、この接着剤が電気絶縁層に浸透した電解液に侵
されると、水蒸気不透過層と電気絶縁層との界面から電
解液が漏洩し、電池１１の性能が低下するという欠点が
あった。また、電気絶縁層と端子４との接着が不十分だ
と、この界面から電解液が漏洩する可能性もあった。本
発明は上記事情に鑑みてなされたもので、小型軽量で密
閉性に優れた二次電池を得ることをその目的としてい
る。In the battery 11, it is necessary to provide an electric insulating layer inside the water vapor impermeable layer in order to avoid contact between the water vapor impermeable layer and the terminal 4. However,
Since the water vapor impervious layer and the electric insulating layer are bonded with an adhesive, when this adhesive is attacked by the electrolytic solution that has permeated into the electric insulating layer, the electrolytic solution penetrates the interface between the water vapor impermeable layer and the electric insulating layer. Has a disadvantage that the performance of the battery 11 is deteriorated. In addition, if the adhesion between the electric insulating layer and the terminal 4 is insufficient, the electrolyte may leak from the interface. The present invention has been made in view of the above circumstances, and has as its object to obtain a small, lightweight, and highly sealed secondary battery.
【０００５】[0005]
【課題を解決するための手段】本発明は、電解液を収容
する袋体と、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、上記袋体を構成する基材の最内層が電
気絶縁層であり、この電気絶縁層に、水蒸気不透過層
が、接着剤層を介することなく積層されており、更に、
上記電気絶縁層が、上記水蒸気不透過層及び上記端子に
対する金属接着性官能基を有する樹脂から構成されてい
ることを特徴としている。SUMMARY OF THE INVENTION The present invention relates to a secondary battery having a bag containing an electrolytic solution and a metal terminal in the form of a tape. The inner layer is an electric insulating layer, and on this electric insulating layer, a water vapor impermeable layer is laminated without interposing an adhesive layer,
The electric insulating layer is made of a resin having a metal-adhesive functional group for the water vapor impermeable layer and the terminal.
【０００６】ここで、上記電気絶縁層が、カルボン酸ま
たはカルボン酸無水物から選択される官能基を有するポ
リオレフィン系樹脂から構成されていることが望まし
い。上記ポリオレフィン系樹脂には、例えば、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が
用いられる。また、上記ポリオレフィンには、例えばポ
リプロピレンが用いられる。Here, it is preferable that the electric insulating layer is made of a polyolefin resin having a functional group selected from carboxylic acid or carboxylic anhydride. As the polyolefin-based resin, for example, a resin obtained by graft copolymerizing maleic anhydride with a polyolefin is used. For the polyolefin, for example, polypropylene is used.
【０００７】[0007]
【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、電気絶縁層６３の形成面
が最内層となるよう筒状に成形した後、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。ここ
で、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 formed into a tubular shape such that a film having a structure as shown in FIG. In a so-called gusset bag. Here, as shown in FIG. 1, the bag body 6 has a joint portion provided at a corner of the bag body 6 and seals the other corners in a columnar shape like the above-described joint portion. Have seal portions 6b at the four corners.
【０００８】上記フィルムの構造を図３に示す。このフ
ィルムは、図３の上方から、保護層６１、水蒸気不透過
層６２、及び電気絶縁層６３から構成されている。水蒸
気不透過層６２は、袋体６内への水蒸気や気体の侵入を
防止するためのもので、その材質には、例えばアルミ等
の金属箔が使用される。また、保護層６１は、水蒸気不
透過層６２を保護するためのもので、その材質には、例
えばＰＥＴ等のポリエステル、ナイロン等のポリアミ
ド、ポリプロピレン等のポリオレフィンをはじめとする
樹脂が、単独または複数併用して使用される。FIG. 3 shows the structure of the above film. This film includes a protective layer 61, a water vapor impermeable layer 62, and an electric insulating layer 63 from above in FIG. The water vapor impermeable layer 62 is for preventing water vapor or gas from entering the bag 6, and is made of a metal foil such as aluminum, for example. The protective layer 61 is for protecting the water vapor impervious layer 62, and may be made of a resin such as a polyester such as PET, a polyamide such as nylon, or a polyolefin such as polypropylene, alone or in combination. Used in combination.
【０００９】電気絶縁層６３は、端子や電極（いずれも
後述）と水蒸気不透過層６２との間の電気絶縁性を確保
し、かつ袋体６の周縁を熱シールするためのもので、水
蒸気不透過層６２に、接着剤層等を介することなく、直
接接着積層されている。このような直接的な接着積層方
法としては、溶融した樹脂を直接積層する押出ラミネー
トや、フィルム状の樹脂を直接熱接着するサーマルラミ
ネート等がある。また、直接的な接着積層方法に際して
は、水蒸気不透過層６２と電気絶縁層６３の双方を加熱
して接着すると高い接着強度が得られる。従って、押出
ラミネートにて接着する場合には、冷却ロールに高温の
液体を流したり、水蒸気不透過層６２を加熱しながらラ
ミネータに送る等の工夫を施すことが望ましい。The electric insulating layer 63 is used to secure electric insulation between the terminals and electrodes (both will be described later) and the water vapor impermeable layer 62 and to heat seal the periphery of the bag 6. It is directly adhered and laminated on the impermeable layer 62 without an adhesive layer or the like. Examples of such a direct adhesive lamination method include extrusion lamination in which a molten resin is directly laminated, and thermal lamination in which a film-shaped resin is directly thermally adhered. In the direct bonding and laminating method, a high bonding strength can be obtained by heating and bonding both the water vapor impermeable layer 62 and the electric insulating layer 63. Therefore, in the case of bonding by extrusion lamination, it is desirable to take measures such as flowing a high-temperature liquid to a cooling roll or sending the steam-impermeable layer 62 to a laminator while heating.
【００１０】上記条件を満たすため、電気絶縁層６３の
材質には、電気絶縁性に優れ、かつ水蒸気不透過層６２
を構成する金属及び上記端子を構成する金属に対して接
着性を有し、高い熱シール強度が得られ、しかも、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、カルボン酸または
カルボン酸無水物のような金属接着性官能基を有するポ
リオレフィン系樹脂、具体的には、無水マレイン酸とグ
ラフト共重合または不飽和カルボン酸とランダム共重合
し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、ポリプロピレンの使用が望ましい。In order to satisfy the above conditions, the material of the electric insulating layer 63 is made of a material having excellent electric insulation and a water vapor impermeable layer 62.
A material having adhesiveness to the metal constituting the above and the metal constituting the above-mentioned terminal, high heat sealing strength is obtained, and corrosion resistance to the electrolytic solution sealed in the bag body 6 is used. . As such a material, a polyolefin resin having a metal adhesive functional group such as carboxylic acid or carboxylic anhydride, specifically, maleic anhydride and graft copolymerized or unsaturated carboxylic acid and random copolymerized A polyolefin-based resin is exemplified. As the polyolefin-based resin, for example, polypropylene, polyethylene, ethylene-vinyl acetate copolymer, etc. can be used. However, polypropylene is preferable because it is excellent in heat resistance and inexpensive.
【００１１】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６ａの
シール面と平行とされている。そして、口部６ａを、端
子４を挟んで表裏から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 accommodated, and a terminal 4 is connected to the electrode 3. ing. The terminal 4 is formed by molding a metal typified by aluminum into a tape shape, and its front and back surfaces are parallel to the sealing surface of the mouth 6a. Then, the mouth 6a is heat-sealed from the front and back with the terminal 4 interposed therebetween, so that the bag 6
Is sealed.
【００１２】ここで、電気絶縁層６３の厚さは、端子４
より厚くする。これは、電気絶縁層６３の厚さが端子４
の厚さ以下だと、端子４を挟んで口部６ａを熱シールし
た際に、端子４との当接部分にて電気絶縁層６３が薄く
なり、水蒸気不透過層６２と端子４とが導通する可能性
があるためである。Here, the thickness of the electric insulating layer 63 is
Make it thicker. This is because the thickness of the electrical insulating layer 63 is
When the thickness is smaller than the thickness, when the mouth 6a is heat-sealed with the terminal 4 interposed therebetween, the electrical insulating layer 63 becomes thinner at the contact portion with the terminal 4, and the water vapor impermeable layer 62 and the terminal 4 are electrically connected. This is because there is a possibility of doing so.
【００１３】また、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。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.
【００１４】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の最内層に、水蒸気不透過層６２を構成する
金属及び端子４を構成する金属に対し接着性を有し、か
つ電解液に対して耐食性を有する電気絶縁層６３を形成
し、電気絶縁層６３を、水蒸気不透過層６２及び端子４
に、接着剤層を介することなく直接接着したため、電気
絶縁層６３と蒸気不透過層６２及び端子４との接着部分
からの電解液の漏洩が防止される。従って、この二次電
池２１によれば、袋体６からの電解液の漏洩に伴う袋体
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. Moreover, an electrical insulating layer 63 having adhesiveness to the metal constituting the water vapor impermeable layer 62 and the metal constituting the terminal 4 and having corrosion resistance to the electrolytic solution is formed on the innermost layer of the bag body 6. , The electric insulating layer 63, the water vapor impermeable layer 62 and the terminal 4.
In addition, since the adhesive is directly bonded without the interposition of the adhesive layer, leakage of the electrolyte from the bonding portion between the electrical insulating layer 63 and the vapor impermeable layer 62 and the terminal 4 is prevented. Therefore, according to the secondary battery 21, a decrease in the hermeticity of the bag 6 due to the leakage of the electrolyte from the bag 6 and a decrease in the performance of the secondary battery 21 due to the reduction are prevented.
【００１５】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
厚みにより口部６ａのシール面と端子４との境界部（図
１に符号Ｄで示す部分）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、電気絶縁層６３を構成する樹脂が口部６ａの熱シー
ルに伴い溶融して上記段差に侵入し、上記段差に形成さ
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 between the sealing surface of the mouth 6a and the terminal 4 (the portion indicated by the symbol D in FIG. 1) is small due to the thickness of the terminal 4. As a result, the bag 6 is more securely sealed. In addition, the resin constituting the electrical insulating layer 63 is melted by the heat sealing of the mouth 6a and penetrates into the step to seal the gap formed in the step, so that the airtightness of the bag body 6 is further improved. improves.
【００１６】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 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.
【００１７】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。袋体６として、直方体状をなさない、例えば３方袋
等を用いることももちろん可能である。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. Of course, it is also possible to use a bag that does not have a rectangular parallelepiped shape, such as a three-sided bag, as the bag 6.
【００１８】[0018]
【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。材質が異なる各種の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（ｍｍ）
の３方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、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し、各種の電池を得た。EXAMPLES Examples will be shown below to explain the effects of the present invention. Prepare various laminated films of different materials, and use these films to make 50 × 100 (mm)
Each of the three-sided bags is prepared, and the positive and negative electrodes and the electrolyte (a material in which a conductive material is dispersed in a non-aqueous dispersion medium and a dye is mixed therein) with a separator interposed therebetween are placed in these bags. With the tape-shaped terminal (aluminum, thickness 100 μm) extending therebetween, the bag body was heat-sealed by sandwiching the opening of the bag with a hot plate to obtain various batteries.
【００１９】そして、これらの電池を、それぞれ濾紙に
包んで８０℃のオーブン内にて１６８時間放置した後、
電解液の漏洩を、濾紙への色素の転写の有無から調査し
た。また、放置後の電池から、端子とフィルムとのシー
ル部分をそれぞれサンプリングして、端子とフィルム間
の接着強度を測定するとともに、個々のフィルムを電解
液に浸積し、６０℃のオーブン内にて１６８時間放置し
た後、電気絶縁層と蒸気不透過層間の接着強度を測定し
た。接着強度の測定には、幅２５ｍｍの試料に対する１
８０°剥離強度試験を用いた。なお、上記の各試験にお
いて、試料数はいずれも１０個とした。After wrapping these batteries in filter paper and leaving them in an oven at 80 ° C. for 168 hours,
The leakage of the electrolyte solution was examined based on whether or not the dye was transferred to the filter paper. In addition, from the battery after standing, each of the sealing portions between the terminal and the film was sampled, and the adhesive strength between the terminal and the film was measured. Each of the films was immersed in an electrolytic solution and placed in an oven at 60 ° C. After standing for 168 hours, the adhesive strength between the electrically insulating layer and the vapor impermeable layer was measured. For the measurement of adhesive strength, 1
An 80 ° peel strength test was used. In each of the above tests, the number of samples was 10 in each case.
【００２０】供試した各種フィルムの組成を図５に、ま
た、液漏れ及び接着強度の調査結果を図６にそれぞれ示
す。図６の結果から、電気絶縁層に金属接着性官能基を
有する樹脂を用い、かつ電気絶縁層を、水蒸気不透過層
及び端子に、接着剤等を用いることなく直接接着した実
施例では、液漏れが生じず、接着強度も高いのに対し、
電気絶縁層と水蒸気不透過層とを接着剤で接着した比較
例１，２では、いずれも液漏れが生じ、電気絶縁層と蒸
気不透過層間の接着強度も低いことがわかる。FIG. 5 shows the composition of each of the tested films, and FIG. 6 shows the results of the examination of the liquid leakage and the adhesive strength. From the results of FIG. 6, it can be seen that in the example in which a resin having a metal adhesive functional group is used for the electric insulating layer and the electric insulating layer is directly bonded to the water vapor impermeable layer and the terminal without using an adhesive or the like, the liquid While there is no leakage and high adhesive strength,
In Comparative Examples 1 and 2 in which the electric insulating layer and the water vapor impermeable layer were bonded with an adhesive, liquid leakage occurred in each case, and it was found that the adhesive strength between the electric insulating layer and the vapor impermeable layer was low.
【００２１】[0021]
【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、袋体の最内層に、水蒸気不透
過層及び端子に対し接着性を有し、かつ電解液に対して
耐食性を有する電気絶縁層を形成し、この電気絶縁層
を、水蒸気不透過層及び端子に、接着剤層等を介するこ
となく直接接着したため、電気絶縁層と蒸気不透過層及
び端子との接着部分からの電解液の漏洩が防止される。
従って、本発明の二次電池によれば、袋体からの電解液
の漏洩に伴う袋体の密閉性低下と、それに起因する二次
電池の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, a water vapor impermeable layer and an electric insulating layer having adhesiveness to the terminals and having corrosion resistance to the electrolytic solution are formed on the innermost layer of the bag, and this electric insulating layer is formed as a water vapor impermeable layer and Since the terminal is directly adhered to the terminal without using an adhesive layer or the like, leakage of the electrolytic solution from a portion where the electric insulating layer and the vapor impermeable layer and the terminal are adhered is prevented.
Therefore, according to the secondary battery of the present invention, a decrease in the hermeticity of the bag due to leakage of the electrolyte from the bag and a decrease in the performance of the secondary battery due to the reduction are prevented.
【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 the 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】 従来の二次電池の構造の例を示す断面図であ
る。FIG. 7 is a cross-sectional view illustrating an example of a structure of a conventional secondary battery.
【図８】 従来の二次電池の構造の例を示す断面図であ
る。FIG. 8 is a cross-sectional view showing an example of the structure of a conventional secondary battery.
３ 電極 ４ 端子 ６ 袋体 ２１ 二次電池 ６２ 水蒸気不透過層 ６３ 電気絶縁層 DESCRIPTION OF SYMBOLS 3 electrode 4 terminal 6 bag 21 secondary battery 62 water vapor impermeable layer 63 electric insulating layer
Claims (4)
す金属製の端子とを有する二次電池であって、 上記袋体を構成する基材の最内層が電気絶縁層であり、
この電気絶縁層に、水蒸気不透過層が、接着剤層を介す
ることなく積層されており、 上記電気絶縁層が、上記水蒸気不透過層及び上記端子に
対する金属接着性官能基を有する樹脂から構成されてい
ることを特徴とする二次電池。1. A secondary battery having a bag containing an electrolyte solution and a tape-shaped metal terminal, wherein an innermost layer of a base material constituting the bag is an electric insulating layer,
On this electric insulating layer, a water vapor impermeable layer is laminated without interposing an adhesive layer, and the electric insulating layer is made of a resin having a metal adhesive functional group for the water vapor impermeable layer and the terminal. A secondary battery comprising:
ルボン酸無水物から選択される官能基を有するポリオレ
フィン系樹脂から構成されてい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 electric insulating layer is made of a polyolefin resin having a functional group selected from carboxylic acid or carboxylic anhydride.
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２に記載の二次電池。3. The secondary battery according to claim 2, wherein the polyolefin resin is a resin obtained by graft copolymerizing maleic anhydride with a polyolefin.
あることを特徴とする請求項３に記載の二次電池。4. The secondary battery according to claim 3, wherein the polyolefin is polypropylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05188799A JP4509242B2 (en) | 1999-02-26 | 1999-02-26 | Secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05188799A JP4509242B2 (en) | 1999-02-26 | 1999-02-26 | Secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000251856A true JP2000251856A (en) | 2000-09-14 |
| JP4509242B2 JP4509242B2 (en) | 2010-07-21 |
Family
ID=12899402
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05188799A Expired - Fee Related JP4509242B2 (en) | 1999-02-26 | 1999-02-26 | Secondary battery |
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| Country | Link |
|---|---|
| JP (1) | JP4509242B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20230155260A1 (en) | 2020-02-07 | 2023-05-18 | Dai Nippon Printing Co., Ltd. | Energy storage device and method for manufacturing energy storage device |
| EP4366045A1 (en) | 2021-06-29 | 2024-05-08 | Dai Nippon Printing Co., Ltd. | Power storage device and method for manufacturing power storage device |
| WO2023277011A1 (en) | 2021-06-29 | 2023-01-05 | 大日本印刷株式会社 | Power storage device, heat transfer body, and package |
| JP7332073B2 (en) | 2021-08-06 | 2023-08-23 | 大日本印刷株式会社 | Electricity storage device and method for manufacturing electricity storage device |
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|---|---|---|---|---|
| JPS5654568U (en) * | 1979-10-02 | 1981-05-13 | ||
| JPS6261268A (en) * | 1985-09-10 | 1987-03-17 | Toppan Printing Co Ltd | Flat-type electrochemical cell |
| JPH10208708A (en) * | 1997-01-28 | 1998-08-07 | Yuasa Corp | Flat cell |
| JPH11191400A (en) * | 1997-09-30 | 1999-07-13 | Toyo Seikan Kaisha Ltd | Nonaqueous electrolyte battery vessel |
| JP2004327039A (en) * | 1998-02-05 | 2004-11-18 | Dainippon Printing Co Ltd | Sheet for battery case |
-
1999
- 1999-02-26 JP JP05188799A patent/JP4509242B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5654568U (en) * | 1979-10-02 | 1981-05-13 | ||
| JPS6261268A (en) * | 1985-09-10 | 1987-03-17 | Toppan Printing Co Ltd | Flat-type electrochemical cell |
| JPH10208708A (en) * | 1997-01-28 | 1998-08-07 | Yuasa Corp | Flat cell |
| JPH11191400A (en) * | 1997-09-30 | 1999-07-13 | Toyo Seikan Kaisha Ltd | Nonaqueous electrolyte battery vessel |
| JP2004327039A (en) * | 1998-02-05 | 2004-11-18 | Dainippon Printing Co Ltd | Sheet for battery case |
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| Publication number | Publication date |
|---|---|
| JP4509242B2 (en) | 2010-07-21 |
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