JP2009238463A - Flat battery - Google Patents

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JP2009238463A
JP2009238463A JP2008080742A JP2008080742A JP2009238463A JP 2009238463 A JP2009238463 A JP 2009238463A JP 2008080742 A JP2008080742 A JP 2008080742A JP 2008080742 A JP2008080742 A JP 2008080742A JP 2009238463 A JP2009238463 A JP 2009238463A
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pair
negative electrode
positive electrode
current collector
electrodes
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JP5332256B2 (en
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Osamu Yamashita
修 山下
Koji Kajitani
浩司 梶谷
Sadahiko Miura
貞彦 三浦
Yukiko Morioka
森岡　　由紀子
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NEC Corp
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    • 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

<P>PROBLEM TO BE SOLVED: To provide a flat battery having improved battery reliability. <P>SOLUTION: The flat battery comprises at least one pair of first electrodes 40 arranged opposing each other, a pair of separators 30 arranged inside the pair of first electrodes 40, respectively, and a second electrode 41 arranged between the pair of separators 30 and having polarity opposite to that of the first electrodes 40. Herein, a fixing part 42 is provided for fixing the pair of first electrodes 40 through a through-portion passing through the pair of separators 30 and the second electrode 41. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、薄型電池に関し、例えば柔軟性を有する薄型電池に関する。   The present invention relates to a thin battery, for example, a flexible thin battery.

昨今、磁気カードに変わる簡易記録媒体として、マイクロコンピュータを内蔵したＩＣカードの需要が拡大してきている。内部電源の無いＩＣカードへの電力の供給は、電磁誘導式が主流である。このため、ＩＣカード内の記録されたデータや新規データの書き込みには、専用端末が必要になるという煩わしさがある。最近、このようなＩＣカードにおいて内部電源を持ち記憶内容を表示したり、セキュリティー機能の入力の機能を設ける試みがある。   Recently, as a simple recording medium replacing a magnetic card, the demand for an IC card with a built-in microcomputer has increased. The mainstream of power supply to an IC card without an internal power supply is an electromagnetic induction type. For this reason, there is an inconvenience that a dedicated terminal is required for writing the recorded data or new data in the IC card. Recently, an attempt has been made to provide an internal power supply in such an IC card to display stored contents and to provide a security function input function.

ＩＣカードなどに組み込む電池は、例えば、図１１に示されるように、負極材２２が形成された負極集電体２１と、正極材１２が形成された正極集電体１１とが、セパレータ３０を介して、対向配置された構成を有する。また、図１２に示されるように、負極材２２が形成された２つの負極集電体２１によって、正極材１２が形成された正極集電体１１を挟む構成とすることも可能である。そして、これらは、電解質３１とともに、外装材３２によって覆われる。また、例えば特許文献１に開示されたような、柔軟性を持つ電池や、特許文献２に開示されたような、曲げ操作を繰り返しても表面に大きなシワが残りにくい薄型電池などが考案されている。   For example, as shown in FIG. 11, a battery incorporated in an IC card or the like includes a negative electrode current collector 21 in which a negative electrode material 22 is formed and a positive electrode current collector 11 in which a positive electrode material 12 is formed. And having a configuration of being opposed to each other. Further, as shown in FIG. 12, it is also possible to sandwich the positive electrode current collector 11 on which the positive electrode material 12 is formed between two negative electrode current collectors 21 on which the negative electrode material 22 is formed. And these are covered with the exterior material 32 with the electrolyte 31. In addition, for example, a battery having flexibility as disclosed in Patent Document 1 and a thin battery such as disclosed in Patent Document 2 in which large wrinkles do not remain on the surface even after repeated bending operations have been devised. Yes.

ＩＣカードなどに組み込む電池は、正極材１２及び負極材２２を分割し複数配置する構成も提案されている。例えば、特許文献３、４には、隔壁を格子状に形成し、電池構成要素を複数に分割する構成が開示されている。また、特許文献５では、同一電池構成内の電池要素を分割し複数配置する構成が開示されている。これにより、電極の膨張収縮や衝撃による破壊による特性劣化を緩和することができる。   As a battery incorporated in an IC card or the like, a configuration in which the positive electrode material 12 and the negative electrode material 22 are divided and arranged in plural is proposed. For example, Patent Documents 3 and 4 disclose a configuration in which partition walls are formed in a lattice shape and a battery component is divided into a plurality of parts. Patent Document 5 discloses a configuration in which a plurality of battery elements in the same battery configuration are divided and arranged. Thereby, characteristic deterioration due to expansion / contraction of the electrode or breakage due to impact can be alleviated.

このようなＩＣカードに組み込む電池には、ＩＣカードのＩＳＯ規格にある物理特性項目において１０００回にもおよぶ曲げサイクル試験、同回数のねじりサイクル試験に耐えられる物理特性が要求されている。しかし、上記のいずれの電池も、物理的特性である、曲げ、ねじりなどに対しては十分でなかった。   A battery incorporated in such an IC card is required to have physical characteristics that can withstand 1000 cycles of bending cycle tests and the same number of torsion cycle tests in the physical characteristics items of the IC card ISO standard. However, none of the batteries described above was sufficient for physical properties such as bending and twisting.

また、薄型電池の利用分野としては、ＩＣカードのほかに、フレキシブルディスプレイや電子ペーパなども提案されており、同様の曲げ、ねじりなど物理特性耐性や温度などによる膨張、収縮に対する信頼性が求められている。
特開平２−２１３０５２号公報 特開２００６−１７２７６６号公報 特開平５−２８３０５５号公報 特開平６−２１５７５３号公報 特開２００１−１５１５３号公報 In addition to IC cards, flexible displays and electronic paper have also been proposed as thin battery usage fields, and similar resistance to physical properties such as bending and twisting and reliability against expansion and contraction due to temperature are required. ing.
Japanese Patent Laid-Open No. 2-213052 JP 2006-172766 A Japanese Patent Application Laid-Open No. H5-283055 JP-A-6-215753 JP 2001-15153 A

薄型電池の曲げ、ねじりサイクル試験としては、ＩＣカードに課される物理特性サイクル試験での耐久性を凌駕する特性が求められる。例えば、薄型電池を弓なりに曲げる操作と元に戻す操作を行うと、凸部表面側の電極層には引っ張り応力がかかり、凹部側には圧縮応力がかかることになる。引っ張り応力を受けた側の電極層の集電体−電極材間にはすべり応力が発生し、他方の圧縮応力を受けた電極層には圧縮応力を逃がすためにシワや、剥離が発生することになる。さらには、曲げ試験を繰り返すことにより集電体１１、２１と電極材１２、２２のシワや、剥離、集電体１１、１２の亀裂が進行すると、セパレータ３０が損傷したり、電池の内部抵抗が上昇したりするなど、電池の機能に致命的な影響を及ぼす可能性がある。また、温度変化などによる膨張収縮などの繰り返し変化に対しても同様の課題がある。また薄型電池に生じたシワ、クラックは、ＩＣカードなどの表面に転写される可能性もあり、ＩＣカードの美観が損なわれるという課題もあった。   As a bending and twisting cycle test of a thin battery, characteristics exceeding the durability in a physical characteristic cycle test imposed on an IC card are required. For example, if the thin battery is bent and returned to its original shape, tensile stress is applied to the electrode layer on the convex surface side, and compressive stress is applied to the concave side. Slip stress occurs between the collector and electrode material of the electrode layer on the side subjected to tensile stress, and wrinkles or peeling occurs in the other electrode layer that receives compressive stress to release the compressive stress. become. Furthermore, if the current collectors 11 and 21 and the electrode materials 12 and 22 are wrinkled, peeled off, or cracked in the current collectors 11 and 12 by repeating the bending test, the separator 30 may be damaged or the internal resistance of the battery The battery function may be fatally affected. Further, there is a similar problem with respect to repeated changes such as expansion and contraction due to temperature changes. In addition, wrinkles and cracks generated in the thin battery may be transferred to the surface of the IC card or the like, which causes a problem that the aesthetic appearance of the IC card is impaired.

また、特許文献３、４のように、格子状に隔壁を形成し、電池構成要素を完全に仕切ると、それぞれの部分に電解質を形成しなければならない。このため、作業性が低下するという課題があった。また、それぞれの部分に電解質を形成するため、電解質濃度を均一にすることが困難であり、電池信頼性が低下するという課題があった。   Further, as in Patent Documents 3 and 4, when partition walls are formed in a lattice shape and battery components are completely partitioned, an electrolyte must be formed in each portion. For this reason, there existed a subject that workability | operativity fell. Moreover, since electrolyte is formed in each part, it was difficult to make electrolyte concentration uniform, and there existed a subject that battery reliability fell.

本発明は、上記の問題を鑑みるためになされたものであり、電池信頼性が向上する薄型電池を提供することを目的とする。   The present invention has been made in view of the above problems, and an object of the present invention is to provide a thin battery with improved battery reliability.

本発明にかかる薄型電池は、対向配置された少なくとも１対の第１電極と、前記１対の第１電極のそれぞれに対して内側に配置された１対のセパレータと、前記１対のセパレータの間に配置され、前記第１電極とは反対の極性を有する第２電極を備えた薄型電池であって、前記１対のセパレータと前記第２電極を貫通する貫通部を通り、前記１対の第１電極を固着する固着部を有するものである。   A thin battery according to the present invention includes at least one pair of first electrodes disposed opposite to each other, a pair of separators disposed inside each of the pair of first electrodes, and the pair of separators. A thin battery comprising a second electrode disposed between and having a polarity opposite to that of the first electrode, wherein the pair of separators and the second electrode pass through a through portion, and the pair of pairs It has a fixing portion for fixing the first electrode.

本発明によれば、電池信頼性が向上する薄型電池を提供することができる。   According to the present invention, a thin battery with improved battery reliability can be provided.

本発明の実施の形態について図面を参照して詳細に説明する。まず、図１を参照して本発明の薄型電池の構成を説明する。図１は、本発明の薄型電池の構成を示す断面図である。   Embodiments of the present invention will be described in detail with reference to the drawings. First, the configuration of the thin battery of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a configuration of a thin battery of the present invention.

本発明にかかる薄型電池は、少なくとも１対の第１電極４０が対向配置される。例えば、図１に示されるように、２つの第１電極４０が対向配置される。そして、１対の第１電極４０の間には第２電極４１が配置される。すなわち、１対の第１電極４０によって、第２電極４１を挟む構成を有する。第１電極４０と第２電極４１は、反対の極性を有する。すなわち、電池における正極、負極の関係を有する。具体的には、第１電極４０とは、正極又は負極のいずれか一方の電極である。そして、第２電極４１とは、他方の電極である。   In the thin battery according to the present invention, at least one pair of the first electrodes 40 are disposed to face each other. For example, as shown in FIG. 1, the two first electrodes 40 are disposed to face each other. A second electrode 41 is disposed between the pair of first electrodes 40. That is, the second electrode 41 is sandwiched between the pair of first electrodes 40. The first electrode 40 and the second electrode 41 have opposite polarities. That is, it has a relationship between the positive electrode and the negative electrode in the battery. Specifically, the first electrode 40 is one of a positive electrode and a negative electrode. The second electrode 41 is the other electrode.

電極４０、４１は、例えば同極の集電体と電極材とが積層された構成を有する。すなわち、負極であれば、負極集電体と負極材とが積層された構成を有する。正極であれば、正極集電体と正極材とが積層された構成を有する。具体的には、第１電極４０は、第１集電体の第２電極４１側の面に第１電極材が形成される。第２電極４１は、第２集電体のそれぞれの第１電極４０側の面に第２電極材が形成される。すなわち、それぞれの電極材が向かい合うように、１対の第１電極４０と第２電極４１が配置される。   The electrodes 40 and 41 have a configuration in which, for example, a current collector of the same polarity and an electrode material are stacked. That is, if it is a negative electrode, it has the structure by which the negative electrode collector and the negative electrode material were laminated | stacked. If it is a positive electrode, it has the structure by which the positive electrode electrical power collector and the positive electrode material were laminated | stacked. Specifically, the first electrode 40 has a first electrode material formed on the surface of the first current collector on the second electrode 41 side. As for the 2nd electrode 41, the 2nd electrode material is formed in the field at the 1st electrode 40 side of each 2nd current collector. That is, a pair of the first electrode 40 and the second electrode 41 are arranged so that the respective electrode materials face each other.

第１電極４０と第２電極４１との間には、それぞれセパレータ３０が設けられる。換言すると、１対の第１電極４０のそれぞれに対して内側に、１対のセパレータ３０が配置される。そして、１対のセパレータ３０の間に第２電極４１が配置された構成となる。このように、薄型電池は、例えば第１電極４０、セパレータ３０、第２電極４１、セパレータ３０、第１電極４０が順次積層された構成を有する。なお、ここでは、第１電極４０を２つ、第２電極４１を１つ、セパレータ３０を２つ積層させたがこれに限らない。例えば、第１電極４０を３つ以上、第２電極４１を２つ以上、セパレータ３０を３つ以上積層してもよい。また、例えばセパレータ３０を固体電解質として、セパレータ３０に電解質の役割をもたせてもよい。もちろん、別途、電解液等の電解質を用いてもよい。   Separators 30 are provided between the first electrode 40 and the second electrode 41, respectively. In other words, a pair of separators 30 is disposed inside each of the pair of first electrodes 40. Then, the second electrode 41 is arranged between the pair of separators 30. Thus, the thin battery has a configuration in which, for example, the first electrode 40, the separator 30, the second electrode 41, the separator 30, and the first electrode 40 are sequentially stacked. Here, two first electrodes 40, one second electrode 41, and two separators 30 are stacked, but the present invention is not limited to this. For example, three or more first electrodes 40, two or more second electrodes 41, and three or more separators 30 may be stacked. Further, for example, the separator 30 may be a solid electrolyte, and the separator 30 may have an electrolyte role. Of course, an electrolyte such as an electrolytic solution may be used separately.

そして、固着部４２は、第２電極４１を挟む１対の第１電極４０の一部を固着する。具体的には、固着部４２には、１対のセパレータ３０と第２電極４１を貫通する貫通部が形成される。すなわち、両側の第１電極４０より内側の全ての構成要素に貫通部が形成される。そして、この貫通部を通り、１対の第１電極４０が固着された固着部４２が形成される。なお、１対の第１電極４０は、熔接等により直接固着されてもよいし、接着剤等を用いて間接的に固着されてもよい。   The fixing portion 42 fixes a part of the pair of first electrodes 40 sandwiching the second electrode 41. Specifically, the fixing portion 42 is formed with a through portion that penetrates the pair of separators 30 and the second electrode 41. In other words, through portions are formed in all the components inside the first electrodes 40 on both sides. And the adhering part 42 to which one pair of 1st electrodes 40 were adhering is formed through this penetration part. The pair of first electrodes 40 may be directly fixed by welding or the like, or may be indirectly fixed using an adhesive or the like.

固着部４２は、例えば離間して複数形成される。なお、固着部４２は、一定の間隔を隔てて複数形成されてもよいし、必要に応じてそれぞれの間隔を変えて複数形成されてもよい。また、固着部４２を複数形成することにより強度が向上する。この場合、それぞれの固着部４２が互いに離間することにより、第２電極４１やセパレータ３０を区分けして設けなくてもよい。これにより、作業性が向上する。本発明の薄型電池は、以上のように構成される。   For example, a plurality of fixing portions 42 are formed apart from each other. Note that a plurality of fixing portions 42 may be formed with a constant interval, or a plurality of fixing portions 42 may be formed with different intervals as necessary. Further, the strength is improved by forming a plurality of fixing portions 42. In this case, the second electrode 41 and the separator 30 do not have to be provided separately by separating the fixing portions 42 from each other. Thereby, workability | operativity improves. The thin battery of the present invention is configured as described above.

上記のように、第１電極４０の一部を固着部４２によって固着することにより、物理的特性試験による曲げ、ねじり、または温度変化などによる膨張収縮などの繰り返し変化に対して格別の信頼性向上の効果を実現することができる。   As described above, a part of the first electrode 40 is fixed by the fixing portion 42, so that the reliability is remarkably improved with respect to repeated changes such as bending, twisting, and expansion / contraction due to a temperature change. The effect of can be realized.

実施の形態１.
次に、具体的な実施の形態について図２〜図４を参照して詳細に説明する。図２は、本実施の形態に係る薄型電池の構成を示す上面図である。図３は、図２のＩＩＩ−ＩＩＩ断面図である。図４は、図２のＩＶ−ＩＶ断面図である。ここでは、一般的なリチウム２次電池を例に挙げて説明する。 Embodiment 1.
Next, specific embodiments will be described in detail with reference to FIGS. FIG. 2 is a top view showing the configuration of the thin battery according to the present embodiment. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. Here, a typical lithium secondary battery will be described as an example.

図３、４に示されるように、正極１０は、対向配置された１対の負極２０に挟まれる。正極１０は、正極集電体１１と正極材１２を有する。正極集電体１１は、負極２０側のそれぞれの面に正極材１２が形成される。すなわち、正極材１２は、正極集電体１１の両面にそれぞれ形成される。負極２０は、負極集電体２１と負極材２２を有する。１対の負極集電体２１は、正極１０側の面に負極材２２が形成される。図２に示されるように、集電体１１、２１は、後述する気密接着層５０内に形成される。   As shown in FIGS. 3 and 4, the positive electrode 10 is sandwiched between a pair of negative electrodes 20 arranged to face each other. The positive electrode 10 includes a positive electrode current collector 11 and a positive electrode material 12. In the positive electrode current collector 11, the positive electrode material 12 is formed on each surface on the negative electrode 20 side. That is, the positive electrode material 12 is formed on both surfaces of the positive electrode current collector 11. The negative electrode 20 includes a negative electrode current collector 21 and a negative electrode material 22. The pair of negative electrode current collectors 21 has a negative electrode material 22 formed on the surface on the positive electrode 10 side. As shown in FIG. 2, the current collectors 11 and 21 are formed in an airtight adhesive layer 50 described later.

また、正極集電体１１は、一部に電極タブ１３を有する。具体的には、集電体１１は一部が突出した矩形状に形成され、突出した部分が電極タブ１３となる。そして、正極集電体１１に外部から接続できるよう、電極タブ１３のみ後述する外装材３２の外側まで形成される。同様に、負極集電体２１は、一部に電極タブ２３を有し、電極タブ２３のみ外装材３２の外側まで形成される。なお、電極タブ２３は、２つの負極２０の負極集電体２１のうち、少なくともいずれか一方によって形成されていればよい。これにより、放電時、正極集電体１１及び負極集電体２１から外部に電流を供給することができる。また、充電時、正極集電体１１及び負極集電体２１に対して外部から電流を供給することができる。正極集電体１１としては、１０μｍ〜５０μｍのアルミ箔を用いることができる。また、負極集電体２１としては、数μｍ〜５０μｍ程度の銅箔を用いることができる。なお、集電体１１、２１としては、金属メッシュシートを用いることが好ましい。これにより、アンカー効果によって電極材１２、２２との密着性が向上し、接触面積も大きくなる。そして、電気特性、信頼性が向上する。また、金属メッシュシートを用いる場合、単版（箔）を用いる場合に比べて屈曲耐性が向上する。   Further, the positive electrode current collector 11 has an electrode tab 13 in part. Specifically, the current collector 11 is formed in a rectangular shape with a part protruding, and the protruding part becomes the electrode tab 13. And only the electrode tab 13 is formed to the outside of the exterior material 32 described later so that it can be connected to the positive electrode current collector 11 from the outside. Similarly, the negative electrode current collector 21 has an electrode tab 23 in a part, and only the electrode tab 23 is formed to the outside of the exterior material 32. The electrode tab 23 may be formed of at least one of the negative electrode current collectors 21 of the two negative electrodes 20. As a result, current can be supplied from the positive electrode current collector 11 and the negative electrode current collector 21 to the outside during discharge. In addition, current can be supplied from the outside to the positive electrode current collector 11 and the negative electrode current collector 21 during charging. As the positive electrode current collector 11, an aluminum foil having a thickness of 10 μm to 50 μm can be used. Moreover, as the negative electrode current collector 21, a copper foil of about several μm to 50 μm can be used. As the current collectors 11 and 21, it is preferable to use a metal mesh sheet. Thereby, adhesiveness with the electrode materials 12 and 22 improves by an anchor effect, and a contact area also becomes large. And electrical characteristics and reliability are improved. Further, when a metal mesh sheet is used, bending resistance is improved as compared with a case where a single plate (foil) is used.

図５に示されるように、正極材１２には複数の円孔がマトリクス状に形成される。図５は、正極材１２の構成を示す上面図である。また、正極集電体１１も同様に複数の円孔がマトリクス状に形成される。正極材１２及び正極集電体１１の円孔は、上面視にて、同一の部分に同一の形状に形成される。また、負極集電体２１には、孔が形成されない。すなわち、負極集電体２１は、欠けのない略矩形状に形成される。負極材２２は、負極集電体２１上に部分的に形成される。正極材１２としてはリチウム酸コバルトなど、負極材２２としてはグラファイトなどが一般的に用いられる。   As shown in FIG. 5, the positive electrode material 12 has a plurality of circular holes formed in a matrix. FIG. 5 is a top view showing the configuration of the positive electrode material 12. Similarly, the positive electrode current collector 11 has a plurality of circular holes formed in a matrix. The circular holes of the positive electrode material 12 and the positive electrode current collector 11 are formed in the same shape in the same part in a top view. In addition, no holes are formed in the negative electrode current collector 21. That is, the negative electrode current collector 21 is formed in a substantially rectangular shape with no chip. The negative electrode material 22 is partially formed on the negative electrode current collector 21. As the positive electrode material 12, cobalt lithium or the like is generally used, and as the negative electrode material 22, graphite or the like is generally used.

図３、４に示されるように、正極材１２と負極材２２との間には、それぞれセパレータ３０が配置される。換言すると、１対の負極２０のそれぞれに対して内側に１対のセパレータ３０が配置される。そして、１対のセパレータ３０の間に正極１０が配置される。具体的には、正極集電体１１の一方の面に形成された正極材１２と、当該正極材１２と対向する負極材２２との間にセパレータ３０が配置される。同様に、正極集電体１１の他方の面に形成された正極材１２と、当該正極材１２と対向する負極材２２との間にセパレータ３０を配置する。すなわち、負極集電体２１、負極材２２、セパレータ３０、正極材１２、正極集電体１１、正極材１２、セパレータ３０、負極材２２、負極集電体２１が順次積層される。   As shown in FIGS. 3 and 4, separators 30 are disposed between the positive electrode material 12 and the negative electrode material 22, respectively. In other words, a pair of separators 30 is arranged inside each of the pair of negative electrodes 20. The positive electrode 10 is disposed between the pair of separators 30. Specifically, the separator 30 is disposed between the positive electrode material 12 formed on one surface of the positive electrode current collector 11 and the negative electrode material 22 facing the positive electrode material 12. Similarly, a separator 30 is disposed between the positive electrode material 12 formed on the other surface of the positive electrode current collector 11 and the negative electrode material 22 facing the positive electrode material 12. That is, the negative electrode current collector 21, the negative electrode material 22, the separator 30, the positive electrode material 12, the positive electrode current collector 11, the positive electrode material 12, the separator 30, the negative electrode material 22, and the negative electrode current collector 21 are sequentially laminated.

図６に示されるように、１対のセパレータ３０には、複数の円孔がマトリクス状に形成される。図６は、セパレータ３０の構成を示す上面図である。すなわち、１対のセパレータ３０には、複数の円孔がそれぞれ形成される。なお、１対のセパレータ３０は、同一形状を有する。すなわち、１対のセパレータ３０に形成された円孔は、同一の部分に同一の形状に形成される。また、セパレータ３０の円孔は、正極１０の円孔と対応して形成される。なお、セパレータ３０の円孔は、正極１０の円孔よりやや小さくなっている。すなわち、上面視にて、正極材１２の円孔の内側にセパレータ３０の円孔が配置される。   As shown in FIG. 6, a plurality of circular holes are formed in a matrix in the pair of separators 30. FIG. 6 is a top view showing the configuration of the separator 30. That is, a plurality of circular holes are respectively formed in the pair of separators 30. The pair of separators 30 have the same shape. That is, the circular holes formed in the pair of separators 30 are formed in the same shape in the same part. Further, the circular holes of the separator 30 are formed corresponding to the circular holes of the positive electrode 10. The circular hole of the separator 30 is slightly smaller than the circular hole of the positive electrode 10. That is, the circular holes of the separator 30 are arranged inside the circular holes of the positive electrode material 12 in a top view.

セパレータ３０としては、ポリエチレンやポリプロピレン、もしくは双方を重ね合わせた不織布からなるものを採用することができる。また、セパレータ３０の厚さは、数μｍ〜５０μｍ程度が望ましい。なお、上面視にて、１対のセパレータ３０の円孔と正極１０の円孔とが重複する部分には、負極材２２が形成されない。すなわち、１対のセパレータ３０と正極１０を貫通する貫通部には、負極材２２が形成されない。換言すると、負極材２２は、貫通部の外側において、負極集電体２１上に形成される。本実施の形態では、負極材２２は、上面視にて正極１０の円孔の外側で、略全体的に形成される。   The separator 30 may be made of polyethylene, polypropylene, or a nonwoven fabric in which both are stacked. Further, the thickness of the separator 30 is desirably about several μm to 50 μm. Note that the negative electrode material 22 is not formed in a portion where the circular hole of the pair of separators 30 and the circular hole of the positive electrode 10 overlap in a top view. That is, the negative electrode material 22 is not formed in the penetrating portion that penetrates the pair of separators 30 and the positive electrode 10. In other words, the negative electrode material 22 is formed on the negative electrode current collector 21 outside the penetrating portion. In the present embodiment, the negative electrode material 22 is formed substantially entirely outside the circular hole of the positive electrode 10 in a top view.

また、図３、４に示されるように、１対の負極集電体２１の間の空間には、電解液などの電解質３１が形成される。電解液としては、エチレンカーボネイト（ＥＣ）、プロピレンカーボネイト（ＰＣ）などの有機溶媒に、リチウム塩などを溶解させたものを用いることができる。リチウム塩の種類としては、例えばＬｉＢＦ４、ＬｉＰＦ６などが良く用いられる。 3 and 4, an electrolyte 31 such as an electrolytic solution is formed in the space between the pair of negative electrode current collectors 21. As an electrolytic solution, a lithium salt or the like dissolved in an organic solvent such as ethylene carbonate (EC) or propylene carbonate (PC) can be used. For example, LiBF 4 and LiPF 6 are often used as the type of lithium salt.

固着部４２は、貫通部に形成される。上記のように、貫通部には、負極集電体２１のみが形成される。すなわち、貫通部には、負極２０の最も外側に形成された外側電極のみが形成される。そして、貫通部を通り、１対の負極集電体２１が固着されることにより固着部４２が形成される。具体的には、それぞれの負極集電体２１の負極材２２が形成されていない部分が、セパレータ３０及び正極１０の円孔を貫いて接続される。固着部４２は、複数の円孔に対応して複数設けられる。   The fixing portion 42 is formed in the through portion. As described above, only the negative electrode current collector 21 is formed in the penetrating portion. That is, only the outer electrode formed on the outermost side of the negative electrode 20 is formed in the penetrating portion. Then, the fixed portion 42 is formed by passing through the penetration portion and fixing the pair of negative electrode current collectors 21. Specifically, the portions of the negative electrode current collectors 21 where the negative electrode material 22 is not formed are connected through the circular holes of the separator 30 and the positive electrode 10. A plurality of fixing portions 42 are provided corresponding to the plurality of circular holes.

図３に示されるように、薄型電池の厚み方向の略中央部で、それぞれの負極集電体２１が固着される。すなわち、負極集電体２１は、固着部４２で内側に窪んだ形状となる。つまり、負極集電体２１は、固着部４２において正極１０側に突出した凸部を有する。換言すると、１対の負極集電体２１間の高さは、固着部４２ではその周辺部より高さが低くなる。これにより、正極材１２及び負極材２２は、加圧保持される。すなわち、両外側の負極集電体２１を複数の場所で貫通させて加圧接続することにより、電池構成物質同士に加圧する力が働く。このような固着部４２の存在により、負極集電体２１間の機械的強度が強固となる。そして、電池構成物質間の導通の信頼性向上が実現できる。また、固着された１対の負極集電体２１は、上記のように１対の負極２０のそれぞれに対して最も外側に有する１対の外側電極である。このように、外側電極を固着させることにより、正極１０、負極２０、セパレータ３０等からなる電池構成物質が分離しにくい。   As shown in FIG. 3, each negative electrode current collector 21 is fixed at a substantially central portion in the thickness direction of the thin battery. That is, the negative electrode current collector 21 has a shape that is recessed inward by the fixing portion 42. That is, the negative electrode current collector 21 has a convex portion that protrudes toward the positive electrode 10 at the fixing portion 42. In other words, the height between the pair of negative electrode current collectors 21 is lower at the fixing portion 42 than at the periphery thereof. Thereby, the positive electrode material 12 and the negative electrode material 22 are held under pressure. That is, by pressing and connecting the negative electrode current collectors 21 on both outer sides at a plurality of locations, a force is applied to the battery constituent materials. Due to the presence of such a fixing portion 42, the mechanical strength between the negative electrode current collectors 21 is strengthened. And the reliability improvement of the conduction | electrical_connection between battery constituent materials is realizable. Further, the pair of fixed negative electrode current collectors 21 are a pair of outer electrodes that are provided on the outermost side with respect to each of the pair of negative electrodes 20 as described above. Thus, by fixing the outer electrode, it is difficult to separate the battery constituent materials composed of the positive electrode 10, the negative electrode 20, the separator 30, and the like.

また、上記のように、セパレータ３０に形成された円孔は、正極１０に形成された円孔より小さくなっている。このため、セパレータ３０の円孔を通ることにより、負極集電体２１の凸部の径を小さくすることができる。また、セパレータ３０より内側（正極１０側）では、負極集電体２１の凸部の径がさらに小さくなる。これにより、負極集電体２１と正極１０とが接触することが抑制され、ショートしにくくなる。このように、固着部４２では、両負極集電体２１間をセパレータ３０をはさんで物理的につなぐ。このため、正極１０及びセパレータ３０の円孔と負極材２２が形成されない部分との位置決め、これらの円孔の大きさは、高精度に設定される必要がある。   Further, as described above, the circular hole formed in the separator 30 is smaller than the circular hole formed in the positive electrode 10. For this reason, the diameter of the convex part of the negative electrode current collector 21 can be reduced by passing through the circular hole of the separator 30. Moreover, the diameter of the convex part of the negative electrode current collector 21 is further reduced on the inner side (positive electrode 10 side) than the separator 30. Thereby, it is suppressed that the negative electrode collector 21 and the positive electrode 10 contact, and it becomes difficult to short-circuit. Thus, in the adhering portion 42, the negative electrode current collectors 21 are physically connected with the separator 30 interposed therebetween. For this reason, the positioning of the circular holes of the positive electrode 10 and the separator 30 and the portion where the negative electrode material 22 is not formed, and the sizes of these circular holes need to be set with high accuracy.

本実施の形態では、固着部４２において、負極集電体２１同士を溶接させて固着する。負極集電体２１としては、金属が一般的に用いられるため、金属同士の溶接が可能であれば様々な接続方法を用いることができる。また、熔接ができない場合や固着力が不十分な場合でも、接着剤を用いれば、負極集電体２１同士を固着させることが可能である。なお、固着部４２は電解質３１とも接触するため、例えば電解質３１に用いられる有機溶媒に侵されにくいことも重要である。   In the present embodiment, the negative electrode current collectors 21 are welded and fixed at the fixing portion 42. Since the metal is generally used as the negative electrode current collector 21, various connection methods can be used as long as the metals can be welded together. Further, even when welding is not possible or when the fixing force is insufficient, the negative electrode current collectors 21 can be fixed to each other by using an adhesive. In addition, since the fixing | fixed part 42 also contacts the electrolyte 31, it is also important that it is hard to be attacked by the organic solvent used for the electrolyte 31, for example.

これら電池構成物質は、フレキシブルなフィルムからなる外装材３２に覆われて密閉される。また、外装材３２は、これらを内側に加圧するように覆う。すなわち、外装材３２は、両側の負極集電体２１に密着する。また、図３においては、外装材３２が負極集電体２１全面に密着していないが、全面に密着していてもよい。すなわち、外装材３２が負極集電体２１の凸部等に沿った形状となっていてもよい。このように、1対の負極集電体２１に密着した状態でこれらを覆うことにより、負極集電体２１間が所定の圧力で加圧保持され、機械的強度がさらに強固となる。   These battery constituent materials are covered and sealed with an exterior material 32 made of a flexible film. Moreover, the exterior material 32 covers so that these may be pressurized inside. That is, the packaging material 32 is in close contact with the negative electrode current collectors 21 on both sides. In FIG. 3, the exterior material 32 is not in close contact with the entire surface of the negative electrode current collector 21, but may be in close contact with the entire surface. That is, the exterior material 32 may have a shape along the convex portion or the like of the negative electrode current collector 21. Thus, by covering these in a state of being in close contact with the pair of negative electrode current collectors 21, the space between the negative electrode current collectors 21 is maintained under a predetermined pressure, and the mechanical strength is further strengthened.

外装材３２としては、樹脂−金属−樹脂のラミネート材を使用している。このラミネート材は、一般的に金属にアルミニウムを使用し、樹脂部にはＰＥＴまたはポリエチレンなどを用い、表層を絶縁してあるものが多い。また、外装材３２は、電池構成物質等を密閉する際の負極集電体２１側の面（外装材３２の内面）に樹脂等からなる接着層を有する。接着層は、外装材３２の内面全面に形成してもよいし、必要な箇所のみに形成されていてもよい。そして、この接着層によって、電池構成物質を囲むように枠状に外装材３２を接着し、気密接着層５０が形成される。本実施の形態にかかる薄型電池は、以上の様に構成される。   As the exterior member 32, a resin-metal-resin laminate material is used. In many cases, this laminate material uses aluminum as a metal, uses PET or polyethylene as a resin part, and insulates the surface layer. Further, the exterior member 32 has an adhesive layer made of a resin or the like on the surface on the negative electrode current collector 21 side (the inner surface of the exterior member 32) when sealing battery constituent materials or the like. The adhesive layer may be formed on the entire inner surface of the exterior material 32, or may be formed only at a necessary location. Then, with this adhesive layer, the exterior material 32 is adhered in a frame shape so as to surround the battery constituent material, and the airtight adhesive layer 50 is formed. The thin battery according to the present embodiment is configured as described above.

本実施の形態にかかる薄型電池は、全体としてシート状に形成され、柔軟性を有する。また、固着部４２により、正負の電極材１２、２２及びセパレータ３０は加圧保持されている。このため、シート状であっても、物理的特性である、曲げ、ねじりなどに対して十分な機械的強度を有する。すなわち、集電体１１、２１と電極材１２、２２のシワや、剥離、集電体１１、１２の亀裂を抑制することが可能である。このため、セパレータ３０の損傷、電池の内部抵抗の上昇など、電池の機能に対する致命的な影響を抑制することができる。また、温度変化などによる膨張収縮などの繰り返し変化に対しても同様に、電池の機能に対する致命的な影響を抑制することができる。すなわち、外部物理的負荷の繰り返しによるショートの発生や電池特性の低下を抑制しつつ、充放電サイクル特性、信頼性を向上させることができる。また、本実施の形態のように、外装材３２によって電池構成物質を密閉している。具体的には、外装材３２によって正負極間が所定の圧力で加圧保持され、外装材３２と１対の負極集電体２１とが密着する。これにより、さらに電池の機械的強度が向上する。   The thin battery according to the present embodiment is formed in a sheet shape as a whole and has flexibility. Further, the positive and negative electrode members 12 and 22 and the separator 30 are held under pressure by the fixing portion 42. For this reason, even if it is a sheet form, it has sufficient mechanical strength against bending, twisting, and the like, which are physical characteristics. That is, it is possible to suppress wrinkles between the current collectors 11 and 21 and the electrode materials 12 and 22, peeling, and cracks in the current collectors 11 and 12. For this reason, the fatal influence with respect to the function of a battery, such as damage to the separator 30 and a raise of internal resistance of a battery, can be suppressed. Similarly, a fatal influence on the function of the battery can be suppressed even in the case of repeated changes such as expansion and contraction due to temperature changes. That is, it is possible to improve the charge / discharge cycle characteristics and reliability while suppressing the occurrence of short circuits and the deterioration of battery characteristics due to repeated external physical loads. Further, as in the present embodiment, the battery constituent material is hermetically sealed by the exterior material 32. Specifically, the exterior material 32 is pressed and held between the positive and negative electrodes at a predetermined pressure, and the exterior material 32 and the pair of negative electrode current collectors 21 are in close contact with each other. This further improves the mechanical strength of the battery.

また、固着部４２を離間して形成することにより、電池構成物質を区分けして設けなくてもよい。このため、電解質３１の濃度が均一になる。また、電解質３１として電解液を設けた場合、電解液の注入が容易になる。これにより、作業性、電池信頼性が向上する。   Further, by forming the fixing portions 42 apart from each other, the battery constituent materials may not be provided separately. For this reason, the concentration of the electrolyte 31 becomes uniform. In addition, when an electrolytic solution is provided as the electrolyte 31, the injection of the electrolytic solution is facilitated. Thereby, workability | operativity and battery reliability improve.

次に、本実施の形態にかかる薄型電池の製造方法を説明する。まず、正極集電体１１の両面上に、例えばスクリーン印刷などにより正極材１２を所定の厚さ寸法、配置で塗布して正極１０を形成する。そして、正極１０を所定の寸法、位置に円孔を形成する。なお、この方法に限らず、正極集電体１１に予め所定の寸法、位置に円孔を形成してもよい。そして、正極集電体１１に正極材１２を塗布又はディッピングしてもよい。つぎに、負極集電体２１の一方の面上に、例えばスクリーン印刷などにより負極材２２を所定の厚さ寸法、配置で塗布して負極２０を形成する。この方法に限らず、マスクを用いた印刷により形成してもよい。このとき、負極材２２を形成しない部分を所定の配置、寸法で設ける必要がある。   Next, the manufacturing method of the thin battery concerning this Embodiment is demonstrated. First, the positive electrode material 12 is applied on both surfaces of the positive electrode current collector 11 with a predetermined thickness and arrangement, for example, by screen printing or the like to form the positive electrode 10. Then, a circular hole is formed in the positive electrode 10 at a predetermined size and position. Not limited to this method, a circular hole may be formed in the positive electrode current collector 11 in a predetermined size and position in advance. Then, the positive electrode material 12 may be applied or dipped on the positive electrode current collector 11. Next, the negative electrode 20 is formed on one surface of the negative electrode current collector 21 by applying the negative electrode material 22 with a predetermined thickness and arrangement, for example, by screen printing or the like. Not limited to this method, it may be formed by printing using a mask. At this time, it is necessary to provide a portion where the negative electrode material 22 is not formed with a predetermined arrangement and dimensions.

次に、セパレータ３０に所定の寸法、位置に円孔を形成する。そして、負極集電体２１、負極材２２、セパレータ３０、正極材１２、正極集電体１１、正極材１２、セパレータ３０、負極材２２、負極集電体２１を順番に重ねる。このとき、正極１０の円孔、セパレータ３０の円孔、及び負極材２２が形成されない部分が重なるようにこれらが形成されていることが重要である。そして、これらの円孔等を正確に位置決めして、負極２０、セパレータ３０、正極１０、セパレータ３０、負極２０を重ねる。そして、正極１０とセパレータ３０の円孔部分、すなわち貫通部において、両側の負極集電体２１を抵抗熔接、熱圧着、又は超音波熔接にて接合（融着）する。なお、予め負極集電体２１に接着剤を塗布しておき、両側の負極集電体２１を接着剤によって接合してもよい。これにより、固着部４２が形成され、電池構成物質が得られる。   Next, a circular hole is formed in the separator 30 at a predetermined size and position. Then, the negative electrode current collector 21, the negative electrode material 22, the separator 30, the positive electrode material 12, the positive electrode current collector 11, the positive electrode material 12, the separator 30, the negative electrode material 22, and the negative electrode current collector 21 are sequentially stacked. At this time, it is important that these are formed so that the circular holes of the positive electrode 10, the circular holes of the separator 30, and the portion where the negative electrode material 22 is not formed overlap. And these circular holes etc. are positioned correctly and the negative electrode 20, the separator 30, the positive electrode 10, the separator 30, and the negative electrode 20 are piled up. Then, the negative electrode current collectors 21 on both sides are joined (fused) by resistance welding, thermocompression bonding, or ultrasonic welding at the circular hole portions of the positive electrode 10 and the separator 30, that is, through portions. Note that an adhesive may be applied to the negative electrode current collector 21 in advance, and the negative electrode current collectors 21 on both sides may be joined with the adhesive. Thereby, the adhering portion 42 is formed, and the battery constituent material is obtained.

次に、外装材３２を袋状、またはケース状に形成したものの中に電池構成物質を挿入する。なお、電極タブ１３、２３のみ、外装材３２からはみ出す。そして、外装材３２内に、電解質３１としての電解液を注入する。また、前もって電極材１２、２２に電解液を適度に含浸しておく、又は形成時に練りこんでおくこともできる。   Next, the battery constituent material is inserted into the outer packaging material 32 formed into a bag shape or a case shape. Only the electrode tabs 13 and 23 protrude from the exterior material 32. Then, an electrolyte solution as the electrolyte 31 is injected into the exterior member 32. In addition, the electrode materials 12 and 22 can be appropriately impregnated with an electrolytic solution in advance, or can be kneaded during formation.

外装材３２は、例えば金属ラミネートシートからなり、内面に接着層を有する。最後に、真空雰囲気中又は減圧雰囲気中で、外装材３２の電池構成物質の周囲の接着層を、溶融及び固化させて気密接着層５０を形成する。これにより、電池構成物質の封止が完了し、薄型電池が得られる。なお、真空雰囲気中又は減圧雰囲気中でなくても、例えば１対の負極集電体２１の間から空気を吸引しながら封止を行ってもよい。以上の工程により、本実施の形態にかかる薄型電池が製造される。   The exterior material 32 is made of, for example, a metal laminate sheet, and has an adhesive layer on the inner surface. Finally, the adhesive layer around the battery constituent material of the exterior member 32 is melted and solidified in a vacuum atmosphere or a reduced pressure atmosphere to form the airtight adhesive layer 50. Thereby, sealing of a battery constituent material is completed and a thin battery is obtained. In addition, even if it is not in a vacuum atmosphere or a pressure-reduced atmosphere, for example, sealing may be performed while sucking air from between a pair of negative electrode current collectors 21. Through the above steps, the thin battery according to the present embodiment is manufactured.

上記のように、製造された薄型電池は、正負極間の機械的強度が強固となる。従って、電気的信頼性および曲げ、ねじりなどの物理特性が格段に向上する。しかも、本実施の形態では、外装材３２を加圧融着する際に、例えば減圧チャンバー内で封止する。このため、薄型電池内部が減圧状態となり、通常使用時では大気圧にてさらに両電極材が加圧される。従って、薄型電池の電気的信頼性がさらに向上するという効果が得られる。   As described above, the manufactured thin battery has a strong mechanical strength between the positive and negative electrodes. Therefore, electrical reliability and physical characteristics such as bending and twisting are significantly improved. Moreover, in the present embodiment, when the exterior material 32 is pressure-fused, it is sealed, for example, in a decompression chamber. Therefore, the inside of the thin battery is in a reduced pressure state, and both electrode materials are further pressurized at atmospheric pressure during normal use. Therefore, an effect of further improving the electrical reliability of the thin battery can be obtained.

なお、本実施の形態では、電極材１２、２２の形成に、スクリーン印刷という工程を採用している。このように、ペースト状の電極材１２、２２を印刷する代わりに、予めフィルム状に形成された電極材１２、２２を用いることもできる。フィルム状の電極材１２、２２の場合、所定の寸法または形状に打ち抜いてセパレータ３０の上に配置することができ位置決めが容易となる。また、印刷用のマスクも不要になるという利点も得られる。   In the present embodiment, a process called screen printing is adopted for forming the electrode materials 12 and 22. Thus, instead of printing the paste-like electrode materials 12 and 22, the electrode materials 12 and 22 previously formed in a film shape can be used. In the case of the film-like electrode materials 12 and 22, they can be punched into a predetermined size or shape and placed on the separator 30 to facilitate positioning. In addition, there is an advantage that a printing mask is not required.

なお、本実施の形態では、正極１０及びセパレータ３０に円孔を形成したがこれに限らない。その他の形状の孔を形成してもよいし、切り欠きを形成してもよい。すなわち、貫通部を通って、負極集電体２１同士が固着できればどのような形状でもよい。   In the present embodiment, circular holes are formed in the positive electrode 10 and the separator 30, but the present invention is not limited to this. Other shapes of holes may be formed, or notches may be formed. That is, any shape may be used as long as the negative electrode current collectors 21 can be fixed to each other through the penetrating portion.

本実施の形態は、リチウムイオン２次電池を例にとり説明を行っているが、その他の薄型電池であるリチウム一次電池、全固体二次電池、マンガン電池などに応用できることは言うまでもない。また、本実施の形態にかかる薄型電池は、カード型端末、フレキシブルディスプレイや電子ペーパなどに使用することができる。以下に示す実施の形態でも、様々な電池に応用することができ、様々な分野に利用することができる。   Although the present embodiment has been described by taking a lithium ion secondary battery as an example, it goes without saying that the present embodiment can be applied to other thin batteries such as a lithium primary battery, an all-solid secondary battery, and a manganese battery. Further, the thin battery according to this embodiment can be used for a card-type terminal, a flexible display, electronic paper, and the like. The following embodiments can also be applied to various batteries and can be used in various fields.

実施の形態２．
本実施の形態は、第１電極として正極１０、第２電極として負極２０を形成する。すなわち、本実施の形態では、実施の形態１における正極１０と負極２０とを逆にした構成を有する。なお、これ以外の基本的な構成は、実施の形態１と同一であるので、実施の形態１と異なる部分のみ説明する。まず、本実施の形態にかかる薄型電池の構成を図７を参照して説明する。図７は、薄型電池の構成を示す断面図である。なお、図７は、実施の形態１の図３に相当する。 Embodiment 2. FIG.
In the present embodiment, the positive electrode 10 is formed as the first electrode, and the negative electrode 20 is formed as the second electrode. That is, the present embodiment has a configuration in which the positive electrode 10 and the negative electrode 20 in the first embodiment are reversed. Since the other basic configuration is the same as that of the first embodiment, only the parts different from the first embodiment will be described. First, the configuration of the thin battery according to this embodiment will be described with reference to FIG. FIG. 7 is a cross-sectional view showing the configuration of a thin battery. FIG. 7 corresponds to FIG. 3 of the first embodiment.

本実施の形態では、負極２０は、対向配置された１対の正極１０に挟まれる。また、負極集電体２１には、両面に負極材２２が形成される。１対の正極集電体１１は、負極２０側の面に正極材１２がそれぞれ形成される。   In the present embodiment, the negative electrode 20 is sandwiched between a pair of positive electrodes 10 arranged to face each other. Further, the negative electrode current collector 21 is formed with a negative electrode material 22 on both sides. In the pair of positive electrode current collectors 11, the positive electrode material 12 is formed on the surface on the negative electrode 20 side.

負極２０には、複数の円孔がマトリクス状に形成される。すなわち、負極集電体２１及び負極材２２には、複数の円孔がマトリクス状に形成される。また、正極集電体１１には、孔が形成されない。すなわち、正極集電体１１は、欠けのない略矩形状に形成される。セパレータ３０のそれぞれの円孔は、負極２０のそれぞれの円孔と対応して形成される。なお、セパレータ３０の円孔は、負極２０の円孔よりやや小さくなっている。また、１対のセパレータ３０と負極２０を貫通する貫通部には、正極材１２が形成されない。すなわち、正極材１２は、貫通部の外側において、正極集電体１１上に形成される。   The negative electrode 20 has a plurality of circular holes formed in a matrix. That is, the negative electrode current collector 21 and the negative electrode material 22 have a plurality of circular holes formed in a matrix. Moreover, no hole is formed in the positive electrode current collector 11. That is, the positive electrode current collector 11 is formed in a substantially rectangular shape with no chip. Each circular hole of the separator 30 is formed corresponding to each circular hole of the negative electrode 20. In addition, the circular hole of the separator 30 is slightly smaller than the circular hole of the negative electrode 20. Further, the positive electrode material 12 is not formed in the penetrating portion that penetrates the pair of separators 30 and the negative electrode 20. That is, the positive electrode material 12 is formed on the positive electrode current collector 11 outside the penetrating portion.

１対の正極集電体１１の間の空間には、電解液などの電解質３１が形成される。また、固着部４２は、貫通部に形成される。上記のように、貫通部には、外側電極としての正極集電体１１のみが形成される。そして、貫通部を通り、１対の正極集電体１１が固着されることにより固着部４２が形成される。具体的には、それぞれの正極集電体１１の正極材１２が形成されていない部分が、セパレータ３０及び負極２０の円孔を貫いて接続される。   An electrolyte 31 such as an electrolytic solution is formed in the space between the pair of positive electrode current collectors 11. Moreover, the adhering portion 42 is formed in the penetrating portion. As described above, only the positive electrode current collector 11 as the outer electrode is formed in the penetrating portion. Then, the fixing portion 42 is formed by passing through the penetration portion and fixing the pair of positive electrode current collectors 11. Specifically, the portion of each positive electrode current collector 11 where the positive electrode material 12 is not formed is connected through the circular holes of the separator 30 and the negative electrode 20.

固着部４２の接続方法は、実施の形態１の金属等からなる負極集電体２１と同様の接続方法が可能である。また、上記のように、正極集電体１１としてアルミ箔を用いることができる。アルミニウムなどの金属では、機械的に加圧接続することも可能である。このような固着部４２の存在により、正極集電体１１間の機械的強度が強固となる。   The connection method of the fixing | fixed part 42 can be the same connection method as the negative electrode electrical power collector 21 which consists of a metal etc. of Embodiment 1. FIG. As described above, an aluminum foil can be used as the positive electrode current collector 11. Metals such as aluminum can be mechanically pressure-connected. Due to the presence of such a fixing portion 42, the mechanical strength between the positive electrode current collectors 11 becomes strong.

これら電池構成物質は、フレキシブルなフィルムからなる外装材３２に覆われて密閉される。また、外装材３２は、これらを内側に加圧するように覆う。本実施の形態にかかる薄型電池は、以上の様に構成される。本実施の形態でも、実施の形態１と同様の効果を奏することができる。   These battery constituent materials are covered and sealed with an exterior material 32 made of a flexible film. Moreover, the exterior material 32 covers so that these may be pressurized inside. The thin battery according to the present embodiment is configured as described above. Also in this embodiment, the same effect as in the first embodiment can be obtained.

次に、本実施の形態にかかる薄型電池の製造方法を説明する。まず、実施の形態１において正極１０を形成した方法と同様に、負極集電体２１の両面上に、負極材２２が設けられた負極２０を形成する。次に、実施の形態１において負極２０を形成した方法と同様に、正極集電体１１の一方の面上に、正極材１２が設けられた正極１０を形成する。   Next, the manufacturing method of the thin battery concerning this Embodiment is demonstrated. First, similarly to the method of forming the positive electrode 10 in Embodiment 1, the negative electrode 20 provided with the negative electrode material 22 is formed on both surfaces of the negative electrode current collector 21. Next, the positive electrode 10 provided with the positive electrode material 12 is formed on one surface of the positive electrode current collector 11 in the same manner as the method of forming the negative electrode 20 in the first embodiment.

そして、正極集電体１１、正極材１２、セパレータ３０、負極材２２、負極集電体２１、負極材２２、セパレータ３０、正極材１２、正極集電体１１を順番に重ねる。このとき、負極２０の円孔、セパレータ３０の円孔、及び正極材１２が形成されない部分が重なるように位置決めして重ねる。そして、負極２０とセパレータ３０の円孔部分、すなわち貫通部において、両側の正極集電体１１を固着する。なお、本実施の形態では、一般的に正極集電体１１に用いられるアルミニウム同士を接続する。このため、実施の形態１の接続方法に加えて、機械接続などの接続方法も採用することができる。従って、本実施の形態では、接続方法の選択が増えるという利点がある。これにより、固着部４２が形成され、電池構成物質が得られる。   Then, the positive electrode current collector 11, the positive electrode material 12, the separator 30, the negative electrode material 22, the negative electrode current collector 21, the negative electrode material 22, the separator 30, the positive electrode material 12, and the positive electrode current collector 11 are sequentially stacked. At this time, the circular holes of the negative electrode 20, the circular holes of the separator 30, and the portion where the positive electrode material 12 is not formed are positioned and overlapped. Then, the positive electrode current collectors 11 on both sides are fixedly attached to the circular hole portions of the negative electrode 20 and the separator 30, that is, through portions. In this embodiment, aluminum generally used for the positive electrode current collector 11 is connected. For this reason, in addition to the connection method of Embodiment 1, connection methods, such as mechanical connection, can also be employ | adopted. Therefore, this embodiment has an advantage that the selection of connection methods increases. Thereby, the adhering portion 42 is formed, and the battery constituent material is obtained.

そして、実施の形態１と同様、外装材３２の中に電池構成物質を挿入し、外装材３２内に、電解質３１としての電解液を注入する。そして、電池構成物質の封止を完了させることにより、薄型電池が得られる。本実施の形態によれば、実施の形態１と同様の効果を奏することに加えて、固着部４２における接続方法の選択が増えるという利点がある。   Then, as in the first embodiment, a battery constituent material is inserted into the exterior material 32, and an electrolyte solution as the electrolyte 31 is injected into the exterior material 32. And a thin battery is obtained by completing sealing of a battery constituent material. According to the present embodiment, in addition to the same effects as those of the first embodiment, there is an advantage that selection of connection methods in the fixing portion 42 is increased.

実施の形態３．
本実施の形態は、正極材１２及び負極材２２を分割して複数形成する。すなわち、上記の実施の形態では正極材１２又は負極材２２に部分的に円孔を形成したが、本実施の形態ではこれらを完全に分割する。なお、これ以外の基本的な構成は、実施の形態１と同一であるので、実施の形態１と異なる部分のみ説明する。まず、本実施の形態にかかる薄型電池の構成を図８、９を参照して説明する。図８は、薄型電池の構成を示す上面図である。図９は、図８のＩＸ−ＩＸ断面図である。図８のＩＩＩ−ＩＩＩ断面図は、実施の形態で参照した図３と共通である。 Embodiment 3 FIG.
In the present embodiment, the positive electrode material 12 and the negative electrode material 22 are divided into a plurality. That is, in the above embodiment, the circular holes are partially formed in the positive electrode material 12 or the negative electrode material 22, but in the present embodiment, these are completely divided. Since the other basic configuration is the same as that of the first embodiment, only the parts different from the first embodiment will be described. First, the configuration of the thin battery according to this embodiment will be described with reference to FIGS. FIG. 8 is a top view showing the configuration of the thin battery. 9 is a cross-sectional view taken along the line IX-IX in FIG. A cross-sectional view taken along line III-III in FIG. 8 is common to FIG. 3 referred to in the embodiment.

電極材１２、２２は、平面方向に互いに離間した複数の分割領域を有する。すなわち、正極材１２は、正極集電体１１の負極２０側のそれぞれの面において、離間して複数形成される。また、負極材２２は、負極集電体２１の正極１０側の面において、離間して複数形成される。また、電極材１２、２２は、固着部４２近傍には形成しない。すなわち、電極材１２、２２は、固着部４２を避けるように離間して形成される。具体的には、正極材１２は、正極集電体１１に形成される円孔を避けるように離間して形成される。負極材２２は、負極集電体２１の凸部を避けて離間して形成される。すなわち、負極材２２は、負極集電体２１を窪ませて固着させる際の妨げにならないように形成される。本実施の形態では、正極材１２と同様、負極材２２も、正極集電体１１に形成される円孔に対応する部分を避けるように離間して形成される。このように、正極集電体１１の円孔、セパレータ３０の円孔、及び負極材２２を形成しない部分が重なるように位置合わせされている。   The electrode materials 12 and 22 have a plurality of divided regions spaced from each other in the planar direction. That is, a plurality of the positive electrode materials 12 are formed separately on each surface of the positive electrode current collector 11 on the negative electrode 20 side. A plurality of negative electrode materials 22 are formed on the surface of the negative electrode current collector 21 on the positive electrode 10 side so as to be separated from each other. Further, the electrode materials 12 and 22 are not formed in the vicinity of the fixing portion 42. That is, the electrode materials 12 and 22 are formed apart so as to avoid the fixing portion 42. Specifically, the positive electrode material 12 is formed apart so as to avoid a circular hole formed in the positive electrode current collector 11. The negative electrode material 22 is formed away from the convex portion of the negative electrode current collector 21. That is, the negative electrode material 22 is formed so as not to hinder the negative electrode current collector 21 from being recessed and fixed. In the present embodiment, like the positive electrode material 12, the negative electrode material 22 is also formed so as to avoid a portion corresponding to the circular hole formed in the positive electrode current collector 11. As described above, the circular holes of the positive electrode current collector 11, the circular holes of the separator 30, and the portion where the negative electrode material 22 is not formed are aligned.

本実施の形態では、図８に示されるように、電極材１２、２２は、それぞれ矩形状に形成され、マトリクス状に配置される。また、分割して複数形成された正極材１２、負極材２２は、形状及び配置を一致させる。すなわち、上面視にて、正極材１２及び負極材２２は、それぞれ一致するように配置される。また、固着部４２は、上面視にて４つの矩形状の電極材１２、２２に囲まれる部分に形成される。すなわち、固着部４２は、矩形状の電極材１２、２２の角部近傍に形成される。これにより、分割された電極材１２、２２の大きさを小さくしなくても、固着部４２を形成しやすくなる。そして、これら電池構成物質は、フレキシブルなフィルムからなる外装材３２に覆われて密閉される。本実施の形態にかかる薄型電池は、以上の様に構成される。   In the present embodiment, as shown in FIG. 8, the electrode members 12 and 22 are each formed in a rectangular shape and arranged in a matrix. Moreover, the positive electrode material 12 and the negative electrode material 22 which were divided and formed in plural form have the same shape and arrangement. That is, the positive electrode material 12 and the negative electrode material 22 are arranged so as to match each other when viewed from above. Further, the fixing portion 42 is formed in a portion surrounded by the four rectangular electrode members 12 and 22 in a top view. That is, the fixing portion 42 is formed in the vicinity of the corner portions of the rectangular electrode materials 12 and 22. This makes it easy to form the fixing portion 42 without reducing the size of the divided electrode materials 12 and 22. These battery constituent materials are covered and sealed with an exterior material 32 made of a flexible film. The thin battery according to the present embodiment is configured as described above.

本実施の形態でも、実施の形態１と同様の効果を奏することができる。また、上記の実施の形態においても孔や切り欠きが形成されていたため外部応力を分散できたが、本実施の形態によればさらに外部応力を分散できる。これは、正極材１２及び負極材２２が平面方向に互いに離間した分割領域を有するためである。   Also in this embodiment, the same effect as in the first embodiment can be obtained. In the above embodiment, the external stress can be dispersed because the holes and notches are formed. However, according to the present embodiment, the external stress can be further dispersed. This is because the positive electrode material 12 and the negative electrode material 22 have divided regions separated from each other in the planar direction.

また、本実施の形態では、分割して複数形成された電極材１２、２２は、形状及び配置を一致させたがこれに限らない。少なくとも、固着部４２において、電極材１２、２２が形成されなければよいので、電極材１２、２２の形状、位置を完全に一致させなくてもよい。また、本実施の形態では、正極材１２及び負極材２２の両方が、平面方向に互いに離間した分割領域を有する構成としたがこれに限らない。正極材１２及び負極材２２のうち少なくともいずれか一方が、平面方向に互いに離間した分割領域を有する構成とすれば、上記の効果を奏することができる。なお、本実施の形態と実施の形態２とを組み合わせてもよい。すなわち、本実施の形態における正極１０及び負極２０とを逆にした構成としてもよい。   Moreover, in this Embodiment, although the electrode materials 12 and 22 divided and formed in multiple numbers matched the shape and arrangement | positioning, it is not restricted to this. At least, since the electrode members 12 and 22 need not be formed in the fixing portion 42, the shapes and positions of the electrode members 12 and 22 may not be completely matched. In the present embodiment, both the positive electrode material 12 and the negative electrode material 22 have the divided regions that are separated from each other in the planar direction. However, the present invention is not limited to this. If at least one of the positive electrode material 12 and the negative electrode material 22 has a divided region separated from each other in the planar direction, the above-described effects can be obtained. Note that the present embodiment and the second embodiment may be combined. That is, the positive electrode 10 and the negative electrode 20 in this embodiment may be reversed.

その他の実施の形態．
実施の形態１では、セパレータ３０に円孔を予め形成したが、固着部４２の形成時にセパレータ３０に円孔を形成してもよい。例えば、超音波熔接など振動させて溶融させるとき、セパレータ３０も溶融する。そして、セパレータ３０を溶融させながら、負極集電体２１同士を熔接させる。このようにして、固着部４２を形成してもよい。また、この場合、溶融したセパレータ３０が負極集電体２１に付着する。具体的には、他方の負極集電体２１と接触する部分近傍の側面に、セパレータ３０が付着する。すなわち、正極１０の円孔近傍において、正極１０と負極集電体２１との間にセパレータ３０が設けられる。換言すると、正極１０の円孔近傍では、負極集電体２１の側面を取り囲むようにセパレータ３０が形成される。 Other embodiments.
In the first embodiment, the circular holes are formed in the separator 30 in advance. However, the circular holes may be formed in the separator 30 when the fixing portion 42 is formed. For example, when melted by vibration such as ultrasonic welding, the separator 30 is also melted. Then, the negative electrode current collectors 21 are welded together while the separator 30 is melted. In this way, the fixing portion 42 may be formed. In this case, the melted separator 30 adheres to the negative electrode current collector 21. Specifically, the separator 30 adheres to the side surface in the vicinity of the portion in contact with the other negative electrode current collector 21. That is, the separator 30 is provided between the positive electrode 10 and the negative electrode current collector 21 in the vicinity of the circular hole of the positive electrode 10. In other words, the separator 30 is formed in the vicinity of the circular hole of the positive electrode 10 so as to surround the side surface of the negative electrode current collector 21.

このように、負極集電体２１と正極１０との間にセパレータ３０が介在するので、絶縁を十分に保つことができる。そして、電気的信頼性が向上する。また、セパレータ３０に予め円孔を形成する必要がない。さらに、上記の実施の形態のような、正極１０の円孔や負極材２２の形成されていない部分と、セパレータ３０の円孔との位置合わせをする必要がない。このため、製造工程が簡略化し、製造コスト削減を実現できる。このように、相乗的（格別）な効果を奏する。   Thus, since the separator 30 is interposed between the negative electrode current collector 21 and the positive electrode 10, insulation can be sufficiently maintained. And electrical reliability improves. Further, it is not necessary to form a circular hole in the separator 30 in advance. Furthermore, it is not necessary to align the circular hole of the positive electrode 10 and the part where the negative electrode material 22 is not formed and the circular hole of the separator 30 as in the above embodiment. For this reason, the manufacturing process is simplified, and the manufacturing cost can be reduced. Thus, there is a synergistic (special) effect.

また、実施の形態１においては、円孔に対応して固着部４２を形成したがこれに限らない。例えば、図１０に示されたように、電池構成物質の外周部にも固着部４２を形成してもよい。図１０は、薄型電池の他の構成を示す断面図である。これにより、機械的強度がさらに強固となる。例えば、電池構成物質の外周部を囲むように枠状に固着部４２を形成してもよい。また、固着部４２を形成した後に、電解質３１として電解液を注入する場合、電池構成物質の外周部を囲む固着部４２の一部に開口を形成してもよい。もちろん、電池構成物質の外周部に固着部４２を部分的に形成してもよい。なお、上記のように固着部４２を形成する場合、負極集電体２１を正極集電体１１等のその他の構成要素より一回り大きく形成する。これは、電池構成物質の外周部の固着部４２近傍で、負極集電体２１と正極１０が接触しないようにするためである。もちろん、これらの変形例は、実施の形態２、３についても適用可能である。   Moreover, in Embodiment 1, although the adhering part 42 was formed corresponding to the circular hole, it is not restricted to this. For example, as shown in FIG. 10, the adhering portion 42 may be formed also on the outer peripheral portion of the battery constituent material. FIG. 10 is a cross-sectional view showing another configuration of the thin battery. Thereby, mechanical strength is further strengthened. For example, the adhering portion 42 may be formed in a frame shape so as to surround the outer peripheral portion of the battery constituent material. Moreover, when inject | pouring electrolyte solution as the electrolyte 31 after forming the adhering part 42, you may form opening in a part of the adhering part 42 surrounding the outer peripheral part of a battery constituent material. Of course, the fixing portion 42 may be partially formed on the outer peripheral portion of the battery constituent material. In addition, when forming the adhering portion 42 as described above, the negative electrode current collector 21 is formed to be slightly larger than other components such as the positive electrode current collector 11. This is to prevent the negative electrode current collector 21 and the positive electrode 10 from coming into contact with each other in the vicinity of the fixing portion 42 on the outer peripheral portion of the battery constituent material. Of course, these modifications can also be applied to the second and third embodiments.

本発明にかかる薄型電池の構成を示す断面図である。It is sectional drawing which shows the structure of the thin battery concerning this invention. 実施の形態１にかかる薄型電池の構成を示す上面図である。1 is a top view illustrating a configuration of a thin battery according to a first embodiment. 図２のＩＩＩ−ＩＩＩ断面図である。It is III-III sectional drawing of FIG. 図２のＩＶ−ＩＶ断面図である。It is IV-IV sectional drawing of FIG. 実施の形態１にかかる正極材の構成を示す上面図である。1 is a top view showing a configuration of a positive electrode material according to a first exemplary embodiment. 実施の形態１にかかるセパレータの構成を示す上面図である。FIG. 3 is a top view showing the configuration of the separator according to the first exemplary embodiment. 実施の形態２にかかる薄型電池の構成を示す上面図である。FIG. 6 is a top view showing a configuration of a thin battery according to a second embodiment. 実施の形態３にかかる薄型電池の構成を示す上面図である。FIG. 6 is a top view showing a configuration of a thin battery according to a third embodiment. 図８のＩＸ−ＩＸ断面図である。It is IX-IX sectional drawing of FIG. 実施の形態にかかる薄型電池の他の構成を示す断面図である。It is sectional drawing which shows the other structure of the thin battery concerning embodiment. 薄型電池の構成を示す断面図である。It is sectional drawing which shows the structure of a thin battery. 他の薄型電池の構成を示す断面図である。It is sectional drawing which shows the structure of another thin battery.

符号の説明Explanation of symbols

１０ 正極、１１ 正極集電体、１２ 正極材、１３ 電極タブ、
２０ 負極、２１ 負極集電体、２２ 負極材、２３ 電極タブ、
３０ セパレータ、３１ 電解質、３２ 外装材、
４０ 第１電極、４１ 第２電極、４２ 固着部、
５０ 気密接着層 10 positive electrode, 11 positive electrode current collector, 12 positive electrode material, 13 electrode tab,
20 negative electrode, 21 negative electrode current collector, 22 negative electrode material, 23 electrode tab,
30 separator, 31 electrolyte, 32 exterior material,
40 first electrode, 41 second electrode, 42 fixing part,
50 Airtight adhesive layer

Claims (8)

対向配置された少なくとも１対の第１電極と、
前記１対の第１電極のそれぞれに対して内側に配置された１対のセパレータと、
前記１対のセパレータの間に配置され、前記第１電極とは反対の極性を有する第２電極を備えた薄型電池であって、
前記１対のセパレータと前記第２電極を貫通する貫通部を通り、前記１対の第１電極を固着する固着部を有する薄型電池。 At least one pair of first electrodes opposed to each other;
A pair of separators disposed inside each of the pair of first electrodes;
A thin battery comprising a second electrode disposed between the pair of separators and having a polarity opposite to that of the first electrode;
A thin battery having a fixing portion that passes through the pair of separators and the second electrode and passes through the second electrode and fixes the pair of first electrodes. 前記固着部は、離間して複数形成される請求項１に記載の薄型電池。   The thin battery according to claim 1, wherein a plurality of the fixing portions are formed apart from each other. 前記１対の第１電極は、それぞれに対して外側に配置された１対の外側電極を有し、
前記固着部では、前記１対の外側電極を固着する請求項１又は２に記載の薄型電池。 The pair of first electrodes has a pair of outer electrodes disposed on the outer side with respect to each other,
The thin battery according to claim 1 or 2, wherein the fixing portion fixes the pair of outer electrodes. 前記１対の第１電極、前記第２電極、及び前記１対のセパレータを有する電池構成物質を覆い、フレキシブルなフィルムからなる外装材を有し、
前記外装材は前記１対の第１電極と密着する請求項１乃至３のいずれか１項に記載の薄型電池。 Covering the battery constituent material having the pair of first electrodes, the second electrode, and the pair of separators, and having an exterior material made of a flexible film,
The thin battery according to any one of claims 1 to 3, wherein the exterior material is in close contact with the pair of first electrodes. 前記第１電極及び前記第２電極の少なくとも一方は、集電体と電極材より構成され、前記電極材は、平面方向に互いに離間した複数の分割領域を有する請求項１乃至４のいずれか１項に記載の薄型電池。   5. The device according to claim 1, wherein at least one of the first electrode and the second electrode includes a current collector and an electrode material, and the electrode material has a plurality of divided regions spaced from each other in a planar direction. The thin battery according to the item. 前記外側電極は、金属メッシュシートからなる集電体である請求項３に記載の薄型電池。   The thin battery according to claim 3, wherein the outer electrode is a current collector made of a metal mesh sheet. 前記固着部において、前記１対の第１電極は、抵抗熔接又は超音波熔接により互いに融着されて固着されている請求項１乃至６のいずれか１項に記載の薄型電池。   The thin battery according to any one of claims 1 to 6, wherein, in the fixing portion, the pair of first electrodes are bonded to each other by resistance welding or ultrasonic welding. 前記固着部において、前記１対の第１電極を固着する接着剤を有する請求項１乃至６のいずれか１項に記載の薄型電池。   The thin battery according to any one of claims 1 to 6, wherein the fixing portion includes an adhesive that fixes the pair of first electrodes.
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