JP2002329530A - Sheet type battery - Google Patents
Sheet type batteryInfo
- Publication number
- JP2002329530A JP2002329530A JP2001135378A JP2001135378A JP2002329530A JP 2002329530 A JP2002329530 A JP 2002329530A JP 2001135378 A JP2001135378 A JP 2001135378A JP 2001135378 A JP2001135378 A JP 2001135378A JP 2002329530 A JP2002329530 A JP 2002329530A
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- negative electrode
- electrode sheet
- separator
- positive electrode
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はシート型電池に関す
る。The present invention relates to a sheet type battery.
【０００２】[0002]
【従来の技術】携帯型電話やノート型パソコン等の電子
機器用の電池としてシート型電池が普及しつつある。2. Description of the Related Art Sheet type batteries are becoming widespread as batteries for electronic devices such as mobile phones and notebook computers.
【０００３】図４は積層型のシート型電池（リチウム二
次電池）の積層構造を示す。同図において、１は正極シ
ート、２は負極シート、３はセパレータ（又は固体電解
質層）である。すなわち、この電池では、複数の正極シ
ート１と複数の負極シート２とがセパレータ３を挟んで
交互に積層され、両側の負極シート２の外側にもセパレ
ータ３が配設されている。このような積層体がシート状
外装材によって封止されている。FIG. 4 shows a laminated structure of a laminated sheet type battery (lithium secondary battery). In FIG. 1, reference numeral 1 denotes a positive electrode sheet, 2 denotes a negative electrode sheet, and 3 denotes a separator (or a solid electrolyte layer). That is, in this battery, the plurality of positive electrode sheets 1 and the plurality of negative electrode sheets 2 are alternately stacked with the separator 3 interposed therebetween, and the separators 3 are also provided outside the negative electrode sheets 2 on both sides. Such a laminate is sealed with a sheet-like exterior material.
【０００４】ここで、負極シート２の方が正極シート１
よりも幅広に形成されているのは、正極シート１の活物
質の対向する部位に負極がないと、正極シート１からＬ
ｉが針状に延びて短絡するためである。また、セパレー
タ３は正極シート１と負極シート２との短絡を防止すべ
く負極シート２よりも幅広に形成されている。[0004] Here, the negative electrode sheet 2 is replaced with the positive electrode sheet 1.
The reason why the positive electrode sheet 1 is formed wider than the positive electrode sheet 1 is that if there is no negative electrode in a portion of the positive electrode sheet 1 facing the active material,
This is because i extends in a needle shape and short-circuits. The separator 3 is formed wider than the negative electrode sheet 2 to prevent a short circuit between the positive electrode sheet 1 and the negative electrode sheet 2.
【０００５】図５は捲回型の電池構造を示す。この捲回
型では、正極シート１と負極シート２とが短絡しないよ
うに、負極シート２の両側にセパレータ（又は固体電解
質層）３を配置して正極シート１と共に捲回されてい
る。負極シート２の内側に配設されたセパレータ３は最
後に余分に１周巻かれている。また、当該捲回型の中心
部では、セパレータ３のみを何周か巻いて芯材（図示省
略）を形成することにより、正極シート１及び負極シー
ト２の最内周部での折曲げ部の曲率半径を大きくして、
該シートの折損を生じないようになされている。FIG. 5 shows a wound type battery structure. In this winding type, separators (or solid electrolyte layers) 3 are arranged on both sides of the negative electrode sheet 2 and wound together with the positive electrode sheet 1 so that the positive electrode sheet 1 and the negative electrode sheet 2 do not short-circuit. The separator 3 disposed inside the negative electrode sheet 2 is finally wound one extra turn. In the center of the wound type, a core material (not shown) is formed by winding only the separator 3 several times to form a bent portion at the innermost peripheral portion of the positive electrode sheet 1 and the negative electrode sheet 2. By increasing the radius of curvature,
The sheet is prevented from being broken.
【０００６】[0006]
【発明が解決しようとする課題】上記積層型の場合、上
述の如く、負極シートよりもセパレータ（又は固体電解
質層）の方が幅広であるから、それに対応して電池も負
極シートよりも余分に幅広に形成する必要がある。ま
た、セパレータ（又は固体電解質層）の必要量も多くな
る。一方、上記捲回型の場合、上述の如く、芯材を必要
とするから、電極シートとセパレータ（又は固体電解質
層）とを薄く巻き上げること、つまり電池を薄くするこ
とが難しい。しかも、芯材を設ける必要のために、起電
力の発生に寄与しないスペースが大きくなり、電池の小
型化に不利になる。また、外周部分にセパレータ（又は
固体電解質層）を余分に捲き、さらには芯材を形成する
となると、このセパレータ（又は固体電解質層）の必要
量も多くなる。In the case of the above-mentioned laminated type, as described above, the separator (or the solid electrolyte layer) is wider than the negative electrode sheet, so that the battery is correspondingly extra than the negative electrode sheet. It must be formed wide. Further, the required amount of the separator (or the solid electrolyte layer) also increases. On the other hand, in the case of the wound type, as described above, a core material is required, so that it is difficult to wind up the electrode sheet and the separator (or the solid electrolyte layer) thinly, that is, to make the battery thin. In addition, since the core material needs to be provided, a space that does not contribute to the generation of the electromotive force becomes large, which is disadvantageous in miniaturizing the battery. In addition, when a separator (or solid electrolyte layer) is additionally wound around the outer peripheral portion and a core material is formed, the required amount of the separator (or solid electrolyte layer) also increases.
【０００７】すなわち、本発明の課題は、セパレータ又
は固体電解質層の必要量を少なくすることにある。That is, an object of the present invention is to reduce the required amount of a separator or a solid electrolyte layer.
【０００８】また、本発明の別の課題は、電池内部のス
ペースの利用効率を高めること、換言すれば、電池の小
型化を図ること、あるいは電池の電気容量を大きくする
ことにある。Another object of the present invention is to increase the efficiency of use of the space inside the battery, in other words, to reduce the size of the battery or increase the electric capacity of the battery.
【０００９】また、本発明の別の課題は、電池製造工程
の簡略化に有利な電池構造を得ることにある。Another object of the present invention is to provide a battery structure which is advantageous for simplifying a battery manufacturing process.
【００１０】[0010]
【課題を解決するための手段】本発明は、上記課題の解
決のために、セパレータ又は固体電解質層をジグザグ状
に設ける構造を採用した。In order to solve the above problems, the present invention employs a structure in which a separator or a solid electrolyte layer is provided in a zigzag shape.
【００１１】すなわち、本発明は、シート状の正極集電
体に正極活物質を塗布してなる複数の正極シートと、シ
ート状の負極集電体に負極活物質を塗布してなる複数の
負極シートとが、セパレータ又は固体電解質層を挟んで
交互に積層されているシート型電池において、上記セパ
レータ又は固体電解質層は、上記正極シートと負極シー
トとの間を縫うようにジグザグに折れ曲がっていること
を特徴とする。That is, the present invention provides a plurality of positive electrode sheets formed by applying a positive electrode active material to a sheet-shaped positive electrode current collector, and a plurality of negative electrodes formed by applying a negative electrode active material to a sheet-shaped negative electrode current collector. In a sheet-type battery in which sheets are alternately stacked with a separator or a solid electrolyte layer interposed therebetween, the separator or the solid electrolyte layer is bent zigzag so as to sew between the positive electrode sheet and the negative electrode sheet. It is characterized by.
【００１２】このような電池構造であれば、捲回型電池
のような芯材は必要でなく、従来の積層型と同様に薄型
にすることができる。しかし、従来の積層型とは違っ
て、セパレータ又は固体電解質層は正極シートと負極シ
ートとの間を縫うようにジグザグに折れ曲がって、正極
シートの一方の側縁と負極シートの他方の側縁とを交互
に包み込んだ形になっている。つまり、正極シートと負
極シートとはセパレータ又は固体電解質層によって互い
の側縁同士が短絡しないように完全に遮られた状態にな
っている。このため、当該短絡防止のために従来の積層
型のようにセパレータ又は固体電解質層を余分に幅広く
設ける必要がなく、電池の小型化あるいは電気容量の増
大に有利になる。With such a battery structure, a core material such as a wound type battery is not required, and the battery can be made thin as in a conventional stacked type. However, unlike the conventional laminated type, the separator or the solid electrolyte layer is bent in a zigzag manner so as to sew between the positive electrode sheet and the negative electrode sheet, and one side edge of the positive electrode sheet and the other side edge of the negative electrode sheet are Are wrapped alternately. That is, the positive electrode sheet and the negative electrode sheet are completely shielded by the separator or the solid electrolyte layer so that the side edges thereof are not short-circuited. For this reason, it is not necessary to provide an extra wide separator or solid electrolyte layer as in the conventional laminated type in order to prevent the short circuit, which is advantageous for reducing the size of the battery or increasing the electric capacity.
【００１３】また、セパレータ又は固体電解質層が連続
しているから、電池の製造においてはセパレータ又は固
体電解質材を連続シートとして供給することができ、製
造工程の簡略化に有利になる。Further, since the separator or the solid electrolyte layer is continuous, the separator or the solid electrolyte material can be supplied as a continuous sheet in the production of a battery, which is advantageous for simplifying the production process.
【００１４】上記正極シートと、負極シートと、セパレ
ータ又は固体電解質層との相互の大きさの関係は次のよ
うにすることが好ましい。It is preferable that the mutual relationship between the positive electrode sheet, the negative electrode sheet, and the separator or the solid electrolyte layer be as follows.
【００１５】すなわち、上記正極シートと負極シートと
の交互配置においてはその両端に負極シートが配置さ
れ、各負極シートはその両側部が正極シートの両外側に
張り出すように該正極シートよりも幅広に形成され、上
記セパレータ又は固体電解質層は、上記両端の負極シー
トを被う部分は該負極シートの幅と実質的に同じ幅を有
し、上記正極シートと負極シートとの間に存する部分が
該正極シートの幅と負極シートの幅の中間の幅となるよ
うに折り曲げられている、というものである。That is, in the alternate arrangement of the positive electrode sheet and the negative electrode sheet, the negative electrode sheets are disposed at both ends thereof, and each negative electrode sheet is wider than the positive electrode sheet so that both sides protrude to both outer sides of the positive electrode sheet. The separator or the solid electrolyte layer, the portion covering the negative electrode sheet at both ends has substantially the same width as the width of the negative electrode sheet, the portion existing between the positive electrode sheet and the negative electrode sheet It is folded so as to have an intermediate width between the width of the positive electrode sheet and the width of the negative electrode sheet.
【００１６】これにより、正極シート、負極シート、セ
パレータ又は固体電解質層の三者の積層体は、その幅が
負極シートの幅と実質的に同じになる。この点、積層体
の幅が負極シートの幅よりもかなり大きくなる従来の積
層型とは異なる。従って、本発明によれば、電池内部の
スペースの利用効率が高くなり、電池の大きさが従来の
積層型と同じであるならば、従来よりも負極シート及び
正極シートを幅広に形成することができ、電気容量の増
大に有利になる。あるいは、同じ電気容量の電池を形成
する場合は、電池の幅を狭くする、つまり、小型にする
ことができる。Accordingly, the width of the three-layered body of the positive electrode sheet, the negative electrode sheet, the separator and the solid electrolyte layer is substantially equal to the width of the negative electrode sheet. This is different from the conventional lamination type in which the width of the laminate is considerably larger than the width of the negative electrode sheet. Therefore, according to the present invention, the use efficiency of the space inside the battery is increased, and if the size of the battery is the same as the conventional stacked type, the negative electrode sheet and the positive electrode sheet can be formed wider than before. This is advantageous for increasing the electric capacity. Alternatively, when batteries having the same electric capacity are formed, the width of the batteries can be reduced, that is, the batteries can be reduced in size.
【００１７】また、セパレータ又は固体電解質層は、両
端の負極シートを被う部分は該負極シートの幅と実質的
に同じ幅であり、正極シートと負極シートとの間に存す
る部分はこの両シートの中間の幅であるから、セパレー
タ又は固体電解質層の使用量も従来よりは少なくて済
む。In the separator or the solid electrolyte layer, the portion covering the negative electrode sheet at both ends is substantially the same width as the width of the negative electrode sheet, and the portion existing between the positive electrode sheet and the negative electrode sheet is both sheets. , The amount of the separator or the solid electrolyte layer used can be smaller than before.
【００１８】[0018]
【発明の効果】以上のように、本発明によれば、複数の
正極シートと複数の負極シートとを相対向するように交
互に配置し、この両シート間を縫うように、連続したセ
パレータ又は固体電解質層をジグザグに折り曲げて積層
した構造を採用したから、従来の積層型と同様に電池を
薄いものにしながら、セパレータ又は固体電解質層はこ
れを負極シートよりも幅広にする必要がなくなり、電池
の小型化ないしは電気容量の増大に有利になり、また、
セパレータ又は固体電解質層の必要量を少なくする上で
も有利になり、さらにはセパレータ又は固体電解質層を
連続シートとして供給することができることから、製造
工程の簡略化にも有利になり、コスト低減が図れる。As described above, according to the present invention, a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately arranged so as to face each other, and a continuous separator or Since the structure in which the solid electrolyte layer is bent in a zigzag pattern and adopted is adopted, the separator or solid electrolyte layer does not need to be wider than the negative electrode sheet while the battery is made thinner as in the conventional laminated type, and the battery is not required. It is advantageous for miniaturization or increase of electric capacity,
This is advantageous in reducing the required amount of the separator or the solid electrolyte layer. Further, since the separator or the solid electrolyte layer can be supplied as a continuous sheet, it is also advantageous in simplifying the manufacturing process and cost reduction can be achieved. .
【００１９】[0019]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００２０】本実施形態に係るシート型電池は、リチウ
ム二次電池であり、図１に示すように、電池外装４の内
部に正極シートと負極シートとセパレータとを積層して
なる積層体１０が収容され、正極の外部端子６及び負極
の外部端子９が電池外装４より外部に突出している。The sheet-type battery according to the present embodiment is a lithium secondary battery. As shown in FIG. 1, a laminated body 10 formed by laminating a positive electrode sheet, a negative electrode sheet, and a separator inside a battery case 4 is provided. The external terminal 6 of the positive electrode and the external terminal 9 of the negative electrode are accommodated and protrude outside from the battery exterior 4.
【００２１】積層体１０は、図２及び図３に示すよう
に、３枚の正極シート１と４枚の負極シート２とがセパ
レータ３を挟んで交互に且つ両端に負極シート２が配置
されるように積層され、さらにリチウムイオンを移動さ
せる電解液が添加されている。セパレータ３は、連続し
たシートによって形成されていて、相隣る正極シート１
と負極シート２との間を縫うようにジグザグに折り曲げ
られて、一方の端は最上段の負極シート２の上面に重ね
られ、他方の端は最下段の負極シート２の下面に重ねら
れている。As shown in FIGS. 2 and 3, the laminated body 10 has three positive electrode sheets 1 and four negative electrode sheets 2 alternately with a separator 3 interposed therebetween, and the negative electrode sheets 2 are arranged at both ends. And an electrolytic solution for moving lithium ions is added. The separator 3 is formed of a continuous sheet, and the adjacent positive electrode sheet 1
Is folded in a zigzag manner so as to sew between the negative electrode sheet 2 and one end thereof is superimposed on the upper surface of the uppermost negative electrode sheet 2, and the other end is superimposed on the lower surface of the lowermost negative electrode sheet 2. .
【００２２】負極シート２はその両側部が正極シート１
の両外側に張り出すように該正極シート１よりも幅広に
形成されている。セパレータ３の、最上段及び最下段の
負極シート２，２をそれぞれ上下からを被う部分は、該
負極シート２の幅と実質的に同じ幅になっている（セパ
レータ３の厚み分、負極シート２の幅よりも若干広くな
る程度である。）。セパレータ３の、正極シート１と負
極シート２との間に存する部分は、正極シート１の幅Ｗ
ｐと負極シート２の幅Ｗｎの中間の幅Ｗｓとなってい
る。The negative electrode sheet 2 has positive electrode sheets 1 on both sides.
Is formed wider than the positive electrode sheet 1 so as to protrude to both outer sides. The portions of the separator 3 that cover the uppermost and lowermost negative electrode sheets 2 and 2 from above and below respectively have substantially the same width as the width of the negative electrode sheet 2 (the thickness of the negative electrode sheet by the thickness of the separator 3. The width is slightly wider than the width of No. 2). The portion of the separator 3 between the positive electrode sheet 1 and the negative electrode sheet 2 has a width W of the positive electrode sheet 1.
The width Ws is intermediate between p and the width Wn of the negative electrode sheet 2.
【００２３】各正極シート１より積層体１０の側方に延
設されたリード部５、並びに各負極シート２より積層体
１０の側方に延設されたリード部８は、それぞれ束ねら
れて正極及び負極の各外部端子６，９に接続されてい
る。The leads 5 extending from each positive electrode sheet 1 to the side of the laminate 10 and the leads 8 extending from each negative electrode sheet 2 to the side of the laminate 10 are bundled and And the external terminals 6 and 9 of the negative electrode.
【００２４】正極シート１は、アルミニウム箔等の金属
箔によるシート状の正極集電体の両面に、リチウム遷移
金属複合酸化物等の正極活物質を塗布してなる。正極リ
ード部５は正極集電体の一部位を延設して構成されてい
る。負極シート２は、銅箔等の金属箔によるシート状の
負極集電体の両面に、炭素材料等の負極活物質を塗布し
てなる。負極リード部８は負極集電体の一部位を延設し
て構成されている。セパレータ３は、ポリオレフィン系
樹脂その他の合成樹脂による微多孔膜であり、例えばポ
リエチレン層の両側にポリプロピレン層が形成された三
層構造のものを採用することができる。電解液は有機溶
媒にリチウム塩を配合してなるものである。The positive electrode sheet 1 is formed by applying a positive electrode active material such as a lithium transition metal composite oxide to both surfaces of a sheet-shaped positive electrode current collector made of a metal foil such as an aluminum foil. The positive electrode lead portion 5 is configured by extending a part of the positive electrode current collector. The negative electrode sheet 2 is formed by applying a negative electrode active material such as a carbon material to both surfaces of a sheet-shaped negative electrode current collector made of a metal foil such as a copper foil. The negative electrode lead portion 8 is formed by extending a part of the negative electrode current collector. The separator 3 is a microporous film made of a polyolefin-based resin or another synthetic resin. For example, a separator having a three-layer structure in which a polypropylene layer is formed on both sides of a polyethylene layer can be employed. The electrolyte is obtained by mixing a lithium salt with an organic solvent.
【００２５】正極及び負極の各外部端子６，９は、ニッ
ケル又はニッケルめっきした鉄、銅、アルミニウム等の
金属の箔やリボンによって形成されている。外装４は、
ポリエチレンテレフタレート等のプラスチックフィルム
とアルミニウム箔等の金属箔とエチレン酢ビコポリマー
等の熱可塑性プラスチックフィルムとをこの順で積層し
てなる厚さ０．１ｍｍ程度のシート状外装材を上下に合
わせ周縁部を熱融着させて形成されている。The external terminals 6 and 9 of the positive electrode and the negative electrode are formed of a metal foil or ribbon of nickel or nickel-plated iron, copper, aluminum or the like. Exterior 4
A plastic film such as polyethylene terephthalate, a metal foil such as aluminum foil, and a thermoplastic plastic film such as ethylene vinyl acetate copolymer are laminated in this order. Is thermally fused.
【００２６】従って、上述の如き積層構造であれば、正
負の電極シート１，２がセパレータ３を挟んで交互に積
層されているから、捲回型電池のような芯材は必要でな
く、薄型にすることができる。Accordingly, with the above-described laminated structure, the positive and negative electrode sheets 1 and 2 are alternately laminated with the separator 3 interposed therebetween. Can be
【００２７】正極シート１と負極シート２とは、その間
を縫うセパレータ３によって互いの側縁同士が短絡しな
いように完全に遮られた状態になっているから、当該短
絡防止のために従来の積層型のようにセパレータを余分
に幅広く設ける必要がない。すなわち、セパレータ３の
両端部分は負極シート２と実質的に同じ幅とし、中間の
折れ曲がった各部分は正極シート１の幅と負極シート２
の幅の中間の幅とすることができ、それによって、積層
体１０の幅は負極シート１の幅と実質的に同じになる。Since the positive electrode sheet 1 and the negative electrode sheet 2 are completely shielded by a separator 3 sewn therebetween so as not to cause a short circuit between their side edges, a conventional laminating method is used to prevent the short circuit. There is no need to provide an extra wide separator unlike the mold. That is, both end portions of the separator 3 have substantially the same width as the negative electrode sheet 2, and each of the intermediate bent portions has the width of the positive electrode sheet 1 and the width of the negative electrode sheet 2.
, So that the width of the laminate 10 is substantially the same as the width of the negative electrode sheet 1.
【００２８】このため、電池の大きさが従来の積層型と
同じであるならば、従来よりも正極シート１及び負極シ
ート２を幅広に形成することができ、電気容量の増大に
有利になる。あるいは、同じ電気容量の電池を形成する
場合は、電池の幅を狭くする、つまり、小型にすること
ができる。また、セパレータ３の全長も従来の積層型に
使用されている全セパレータを合わせた長さよりも短く
なるから、材料費の削減に有利になる。For this reason, if the size of the battery is the same as that of the conventional stack type, the positive electrode sheet 1 and the negative electrode sheet 2 can be formed wider than in the conventional case, which is advantageous in increasing the electric capacity. Alternatively, when batteries having the same electric capacity are formed, the width of the batteries can be reduced, that is, the batteries can be reduced in size. Further, the total length of the separator 3 is also shorter than the total length of all the separators used in the conventional laminated type, which is advantageous in reducing the material cost.
【００２９】さらに、セパレータ３は連続しているか
ら、電池の製造においてはセパレータ３を連続シートと
して供給することができ、製造工程の簡略化に有利にな
る。Further, since the separator 3 is continuous, the separator 3 can be supplied as a continuous sheet in the manufacture of a battery, which is advantageous for simplifying the manufacturing process.
【００３０】なお、上記実施形態では電解液を保持する
セパレータを用いたが、セパレータに代えて固体電解質
層を設けることができる。In the above embodiment, the separator for holding the electrolyte is used, but a solid electrolyte layer can be provided instead of the separator.
【００３１】すなわち、固体電解質層としては、ポリマ
ー基質に電解液（塩（電解質）＋相溶性溶媒）を含浸し
てゲル化し、それ自体がイオン伝導性を示すように調製
されたものを用いることができる。ポリマー基質として
は、ビニリデンフルオライドを主単位とするフッ素ポリ
マーの多孔質体を用いることができる。That is, as the solid electrolyte layer, a polymer substrate impregnated with an electrolyte solution (salt (electrolyte) + compatible solvent) to be gelled and used to be itself prepared to exhibit ionic conductivity is used. Can be. As the polymer substrate, a porous body of a fluoropolymer having vinylidene fluoride as a main unit can be used.
【００３２】上記塩としては、リチウム塩、例えば、Ｌ
ｉＣｌＯ4、ＬｉＢＦ4、ＬｉＰＦ6、ＬｉＡｓＦ6、Ｌｉ
ＣＦ3ＳＯ3、ＬｉＡｌＣｌ4及びＬｉ(ＣＦ3ＳＯ2)2Ｎか
らなる群から選ばれる１種を又は２種以上を組み合わせ
て用いることができる。上記相溶性溶媒としては、エチ
レンカーボネート（ＥＣ）、プロピレンカーボネート
（ＰＣ）、ジエチルカーボネート（ＤＥＣ）及びエチル
メチルカーボネート（ＥＭＣ）からなる混合溶媒を用い
ることができる。As the above salt, a lithium salt such as L
iClO 4 , LiBF 4 , LiPF 6 , LiAsF 6 , Li
One type selected from the group consisting of CF 3 SO 3 , LiAlCl 4 and Li (CF 3 SO 2 ) 2 N can be used, or two or more types can be used in combination. As the above-mentioned compatible solvent, a mixed solvent composed of ethylene carbonate (EC), propylene carbonate (PC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) can be used.
【００３３】上記混合溶媒において、エチレンカーボネ
ートの混合比は１〜３０体積％であることが好ましく、
１５〜２５体積％であることがより好ましい。プロピレ
ンカーボネートの混合比は１〜３体積％であることが好
ましく、５〜１５体積％であることがより好ましい。ジ
エチルカーボネートの混合比は１〜３０体積％であるこ
とが好ましく、５〜２０体積％であることがより好まし
い。エチルメチルカーボネートの混合比は１０〜９７体
積％であることが好ましく、５０〜７０体積％であるこ
とがより好ましい。In the above mixed solvent, the mixing ratio of ethylene carbonate is preferably 1 to 30% by volume,
More preferably, the content is 15 to 25% by volume. The mixing ratio of propylene carbonate is preferably from 1 to 3% by volume, more preferably from 5 to 15% by volume. The mixing ratio of diethyl carbonate is preferably 1 to 30% by volume, more preferably 5 to 20% by volume. The mixing ratio of ethyl methyl carbonate is preferably from 10 to 97% by volume, and more preferably from 50 to 70% by volume.
【００３４】また、好ましく用いられるビニリデンフル
オライドを主単位とするフッ素ポリマーは、ビニリデン
フルオライドの単独重合体（ポリビニリデンフルオライ
ド（ＰＶｄＦ））、又はビニリデンフルオライドとその
他のフッ素原子を有するビニル系モノマーとの共重合体
であり、これらはそれぞれ単独で用いても、２種以上を
混合して用いてもよい。ビニリデンフルオライド以外の
フッ素原子を有するビニル系モノマーとしては、ヘキサ
フルオロプロピレン（ＨＦＰ）、クロロトリフルオロエ
チレン（ＣＴＦＥ）、テトラフルオロエチレン（ＴＦ
Ｅ）等が挙げられる。また、共重合体の形態はランダ
ム、ブロックのいずれの形態でもよい。共重合体である
場合、ビニリデンフルオライド（の単位）の割合が７０
モル％以上が好ましく、特に好ましいのは７５モル％以
上である。The preferred fluoropolymer having vinylidene fluoride as a main unit is a homopolymer of vinylidene fluoride (polyvinylidene fluoride (PVdF)) or vinylidene fluoride and another vinyl polymer having a fluorine atom. It is a copolymer with a monomer, and these may be used alone or in combination of two or more. Vinyl monomers having a fluorine atom other than vinylidene fluoride include hexafluoropropylene (HFP), chlorotrifluoroethylene (CTFE), and tetrafluoroethylene (TF
E) and the like. The form of the copolymer may be any of a random form and a block form. In the case of a copolymer, the ratio of (unit) of vinylidene fluoride is 70
It is preferably at least 75 mol%, particularly preferably at least 75 mol%.
【００３５】また、固体電解質としては電解液を含まな
いものであってもよい。The solid electrolyte may not contain an electrolytic solution.
【図１】本発明の実施形態に係るシート型電池の斜視
図。FIG. 1 is a perspective view of a sheet-type battery according to an embodiment of the present invention.
【図２】同シート型電池の積層体の斜視図。FIG. 2 is a perspective view of a laminate of the sheet type battery.
【図３】同積層体の断面図。FIG. 3 is a sectional view of the laminate.
【図４】従来の積層型電池の積層体の断面図。FIG. 4 is a cross-sectional view of a stacked body of a conventional stacked battery.
【図５】従来の捲回型電池の捲回物の断面図。FIG. 5 is a cross-sectional view of a wound product of a conventional wound battery.
１ 正極シート ２ 負極シート ３ セパレータ（又は固体電解質層） ４ 外装 ５ 正極リード部 ６ 正極外部端子 ７ 絶縁テープ ８ 負極リード部 ９ 負極外部端子 １０ 積層体 DESCRIPTION OF SYMBOLS 1 Positive electrode sheet 2 Negative electrode sheet 3 Separator (or solid electrolyte layer) 4 Exterior 5 Positive electrode lead part 6 Positive external terminal 7 Insulating tape 8 Negative lead part 9 Negative external terminal 10 Laminated body
───────────────────────────────────────────────────── フロントページの続き (72)発明者 厨子 敏郎 兵庫県伊丹市池尻４丁目３番地 三菱電線 工業株式会社伊丹製作所内 (72)発明者 丸本 光弘 兵庫県伊丹市池尻４丁目３番地 三菱電線 工業株式会社伊丹製作所内 (72)発明者 御所 至 兵庫県伊丹市池尻４丁目３番地 三菱電線 工業株式会社伊丹製作所内 Ｆターム(参考） 5H021 BB04 CC19 EE04 HH03 HH10 5H029 AJ03 AJ14 AK03 AL06 AM03 AM05 AM07 AM16 BJ04 BJ12 BJ15 CJ03 DJ04 HJ04 HJ12 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiro Niko 4-chome 3, Ikejiri, Itami-shi, Hyogo Mitsubishi Cable Industries, Ltd. Itami Works (72) Inventor Mitsuhiro Marumoto 4-chome 3, Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Wire In Itami Works, Industrial Co., Ltd. (72) Inventor: Toshi Gosho 4-3, Ikejiri, Itami-shi, Hyogo Mitsubishi Electric Cable Co., Ltd.Itami Works F-term (reference) BJ04 BJ12 BJ15 CJ03 DJ04 HJ04 HJ12
Claims (2)
布してなる複数の正極シートと、シート状の負極集電体
に負極活物質を塗布してなる複数の負極シートとが、セ
パレータ又は固体電解質層を挟んで交互に積層されてい
るシート型電池において、 上記セパレータ又は固体電解質層は、上記正極シートと
負極シートとの間を縫うようにジグザグに折れ曲がって
いることを特徴とするシート型電池。1. A plurality of positive electrode sheets formed by applying a positive electrode active material to a sheet-shaped positive electrode current collector, and a plurality of negative electrode sheets formed by applying a negative electrode active material to a sheet-shaped negative electrode current collector, In a sheet-type battery that is alternately stacked with a separator or a solid electrolyte layer interposed therebetween, the separator or the solid electrolyte layer is bent in a zigzag manner so as to sew between the positive electrode sheet and the negative electrode sheet. Sheet type battery.
て、 上記正極シートと負極シートとの交互配置においてはそ
の両端に負極シートが配置され、各負極シートはその両
側部が正極シートの両外側に張り出すように該正極シー
トよりも幅広に形成され、 上記セパレータ又は固体電解質層は、上記両端の負極シ
ートを被う部分は該負極シートの幅と実質的に同じ幅を
有し、上記正極シートと負極シートとの間に存する部分
が該正極シートの幅と負極シートの幅の中間の幅となる
ように折り曲げられていることを特徴とするシート型電
池。2. The sheet-type battery according to claim 1, wherein in the alternate arrangement of the positive electrode sheet and the negative electrode sheet, negative electrode sheets are disposed at both ends thereof, and each of the negative electrode sheets has both sides outside the positive electrode sheet. The separator or the solid electrolyte layer has a portion covering the negative electrode sheet at both ends has a width substantially equal to the width of the negative electrode sheet, and A sheet-type battery, wherein a portion existing between the sheet and the negative electrode sheet is bent so as to have an intermediate width between the width of the positive electrode sheet and the width of the negative electrode sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001135378A JP5081348B2 (en) | 2001-05-02 | 2001-05-02 | Sheet type battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001135378A JP5081348B2 (en) | 2001-05-02 | 2001-05-02 | Sheet type battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002329530A true JP2002329530A (en) | 2002-11-15 |
| JP5081348B2 JP5081348B2 (en) | 2012-11-28 |
Family
ID=18982852
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001135378A Expired - Lifetime JP5081348B2 (en) | 2001-05-02 | 2001-05-02 | Sheet type battery |
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| Country | Link |
|---|---|
| JP (1) | JP5081348B2 (en) |
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