JP2009224102A - Flat battery - Google Patents

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JP2009224102A
JP2009224102A JP2008065517A JP2008065517A JP2009224102A JP 2009224102 A JP2009224102 A JP 2009224102A JP 2008065517 A JP2008065517 A JP 2008065517A JP 2008065517 A JP2008065517 A JP 2008065517A JP 2009224102 A JP2009224102 A JP 2009224102A
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electrode
separator
active material
negative electrode
current collector
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Toku Takai
徳 高井
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Maxell Ltd
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Hitachi Maxell Ltd
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    • Y02E60/12

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  • Battery Electrode And Active Subsutance (AREA)
  • Cell Separators (AREA)
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a flat battery capable of facilitating positioning of the negative active material layer of a negative electrode and the positive active material layer of a positive electrode in an electrode body formed by laminating a plurality of sets of a positive electrode, a negative electrode, and a separator placed between both electrodes in the up and down direction. <P>SOLUTION: The flat battery is formed by housing the electrode body 1 formed by laminating a plurality of sets of the positive electrode 4, the negative electrode 5, and the separator 6 placed between booth electrodes in the up and down direction in an outer packaging 2 made of a laminate film 3. In the negative electrode 5, a negative active material layer 10 is arranged on up and down both sides of the negative electrode 5 by arranging a metallic lithium negative active material layer 10 on one surface of a sheet-like negative current collector 11, and folding the negative current collector 11 up and down so that the other surface, where the negative active material layer 10 is not arranged, of the negative current collector 11 is positioned on the inside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電池を湾曲させる等の電池の姿勢の自由化を図るためにラミネートフィルム製の袋状の外装材内に、発電要素としての電極体を収容するリチウム一次電池等の扁平型電池に関する。   The present invention relates to a flat battery such as a lithium primary battery in which an electrode body as a power generation element is accommodated in a bag-shaped exterior member made of a laminate film in order to liberalize the battery posture, such as bending the battery. .

ラミネートフィルム製の袋状の外装材内に電極体を収容する扁平型電池の公知例としては、例えば特許文献1ないし3を挙げることができる。特許文献1の扁平型電池では、シート状の正極とシート状のセパレータとシート状の負極とを上下に重ねて電極体を形成し、該電極体をラミネートフィルム製の袋状の外装材内に収容している。   For example, Patent Documents 1 to 3 can be cited as well-known examples of a flat battery in which an electrode body is accommodated in a bag-shaped exterior material made of a laminate film. In the flat battery of Patent Document 1, an electrode body is formed by stacking a sheet-like positive electrode, a sheet-like separator, and a sheet-like negative electrode on top and bottom, and the electrode body is placed in a bag-like exterior material made of a laminate film. Contained.

特許文献2の扁平型電池では、正極集電体の片面に形成された正極活物質層どうしが対向するように正極を屈曲させ、該正極活物質層どうしが対向する面間にセパレータを介して屈曲姿勢の負極を配置して電極体を形成し、該電極体をラミネートフィルム製の袋状の外装材内に収容している。特許文献3の扁平型電池では、セパレータを二つ折りして正極を挟み、セパレータで挟まれた正極と、負極とを交互に複数積層して電極体を形成し、該電極体をラミネートフィルム製の袋状の外装材内に収容している。   In the flat battery of Patent Document 2, the positive electrode is bent so that the positive electrode active material layers formed on one surface of the positive electrode current collector face each other, and a separator is interposed between the surfaces where the positive electrode active material layers face each other. An electrode body is formed by arranging a negative electrode in a bent posture, and the electrode body is accommodated in a bag-shaped exterior material made of a laminate film. In the flat battery of Patent Document 3, the separator is folded in half to sandwich the positive electrode, and a plurality of positive electrodes and negative electrodes sandwiched between the separators are alternately stacked to form an electrode body. It is housed in a bag-like exterior material.

特開平11−312505号公報(図3−4)Japanese Patent Laid-Open No. 11-31505 (FIG. 3-4) 特開2007−42567号公報(図2)Japanese Patent Laying-Open No. 2007-42567 (FIG. 2) 特開2008−41623号公報(図1)JP 2008-41623 A (FIG. 1)

しかし、特許文献1の扁平型電池では、その図4に示すように正極と負極とがそれぞれ一枚ずつしか積層されていないために、正極と負極との対向面積があまり大きくならず、この分だけ放電電流をあまり大きくできないことになる。特許文献2の扁平型電池では、その図2に示すように正極と負極とが上下複数段に重なるために、正極と負極との対向面積が大きくなって放電電流を大きくできるが、正極を屈曲させた状態で正極活物質層が正確な対向位置になるように、正極活物質層を正極集電体に配置することは容易ではない。このため、特許文献2の扁平型電池では、正極活物質層が適正な対向位置からずれ易く、放電電流を十分には大きくできないおそれがある。   However, in the flat battery of Patent Document 1, since only one positive electrode and one negative electrode are stacked as shown in FIG. 4, the facing area between the positive electrode and the negative electrode is not so large. Only the discharge current cannot be increased. In the flat battery of Patent Document 2, since the positive electrode and the negative electrode overlap each other in a plurality of stages as shown in FIG. 2, the facing area between the positive electrode and the negative electrode can be increased and the discharge current can be increased. It is not easy to dispose the positive electrode active material layer on the positive electrode current collector so that the positive electrode active material layer is in the correct facing position in the state of being made. For this reason, in the flat battery of Patent Document 2, the positive electrode active material layer is likely to be displaced from an appropriate facing position, and the discharge current may not be sufficiently increased.

特許文献3の扁平型電池でも、正極と負極とが複数積層されていることで、放電電流を大きくすることができる利点がある。ところで、かかる扁平型電池にあっては、上下の正極間に位置する負極は、例えば負極集電体の上下両面に負極活物質層をそれぞれ配置することで形成されるが、通常、負極集電体の上面に負極活物質層を配置する工程と、負極集電体の下面に負極活物質層を配置する工程とは別々に行われるために、製造誤差で上下の負極活物質層間の位置関係がずれることがある。   The flat battery of Patent Document 3 also has an advantage that the discharge current can be increased by stacking a plurality of positive electrodes and negative electrodes. By the way, in such a flat battery, the negative electrode positioned between the upper and lower positive electrodes is formed, for example, by disposing negative electrode active material layers on both upper and lower surfaces of the negative electrode current collector. Since the step of disposing the negative electrode active material layer on the upper surface of the body and the step of disposing the negative electrode active material layer on the lower surface of the negative electrode current collector are performed separately, the positional relationship between the upper and lower negative electrode active material layers due to manufacturing errors May shift.

このため、負極集電体の上下の各負極活物質層を、該負極の上下に重ねられる正極の正極活物質層にそれぞれ正確に対向させようとすると、例えば、負極の上下の各負極活物質層毎に、その負極に重なる各正極の正極活物質層との位置合わせを行う必要がある。この分だけ、電極体の作製に手間が掛かることになる。   For this reason, when trying to make the negative electrode active material layers on the upper and lower sides of the negative electrode current collector accurately face the positive electrode active material layers of the positive electrode stacked on the upper and lower sides of the negative electrode, respectively, For each layer, it is necessary to align the positive electrode active material layer of each positive electrode that overlaps the negative electrode. Therefore, it takes time and effort to produce the electrode body.

本発明は、以上のような問題点を解決するためになされたものであり、正極と負極とセパレータとを上下方向に複数積層した電極体において、負極の負極活物質層と正極の正極活物質層との位置合わせを容易にできる扁平型電池を提供することにある。   The present invention has been made in order to solve the above-described problems, and in an electrode body in which a plurality of positive electrodes, negative electrodes, and separators are stacked in the vertical direction, a negative electrode active material layer of the negative electrode and a positive electrode active material of the positive electrode It is an object of the present invention to provide a flat battery that can be easily aligned with a layer.

本発明は、正極4と負極5との間にセパレータ6を介在させた状態で上下方向に複数積層した電極体1を、ラミネートフィルム3製の袋状の外装材2内に収容した扁平型電池を対象とする。そして、正極4および負極5のうちの一方の電極5は、シート状の集電体11の一方の面に金属製の活物質層10を配置して、活物質層10を配置していない他方の面を内側にして集電体11を上下に折り畳むことで、一方の電極5の上下両側に活物質層10がそれぞれ配置されるようになっていることを特徴とする。
ここでは、一方の電極を負極として一方の電極に負極5の符号を付したが、一方の電極が正極4であってもよい。
The present invention relates to a flat battery in which a plurality of electrode bodies 1 stacked in the vertical direction with a separator 6 interposed between a positive electrode 4 and a negative electrode 5 are accommodated in a bag-shaped exterior material 2 made of a laminate film 3. Is targeted. One electrode 5 of the positive electrode 4 and the negative electrode 5 has a metal active material layer 10 disposed on one surface of a sheet-like current collector 11 and the other one on which the active material layer 10 is not disposed. The active material layers 10 are arranged on both the upper and lower sides of one of the electrodes 5 by folding the current collector 11 up and down with the surface of the electrode 11 inside.
Here, one electrode is used as a negative electrode, and one electrode is provided with the sign of the negative electrode 5, but one electrode may be the positive electrode 4.

前記セパレータ6は、扁平四角形状の袋状に形成されていて、該袋状のセパレータ6内に正極4および負極5のうちの他方の電極4が収容されているものとすることができる。
ここでは、前述のように一方の電極を負極とし、他方の電極を正極として他方の電極に正極4の符号を付したが、他方の電極が負極5であってもよい。
The separator 6 is formed in a flat rectangular bag shape, and the other electrode 4 of the positive electrode 4 and the negative electrode 5 can be accommodated in the bag-like separator 6.
Here, as described above, one electrode is a negative electrode, the other electrode is a positive electrode, and the other electrode is labeled with the positive electrode 4. However, the other electrode may be the negative electrode 5.

具体的には、セパレータ6は、一枚のシート材12を上下に折り畳んで該セパレータ6の上側部分6aと下側部分6bとの周縁どうしを接着することで、扁平四角形状の袋状に形成されている。   Specifically, the separator 6 is formed into a flat rectangular bag shape by folding a single sheet material 12 up and down and bonding the peripheral edges of the upper portion 6a and the lower portion 6b of the separator 6 together. Has been.

また、セパレータ6は、二枚のシート材12を重ね合わせて、これらシート材12の周縁どうしを接着することで、扁平四角形状の袋状に形成されるものとすることができる。   Further, the separator 6 can be formed into a flat rectangular bag shape by overlapping two sheet materials 12 and bonding the peripheral edges of these sheet materials 12 together.

一方の電極5の集電体11には、導電性のリード19が一体形成されているものとすることができる。   A conductive lead 19 may be integrally formed on the current collector 11 of one electrode 5.

袋状のセパレータ6内に収容される他方の電極4は、シート状の集電体9の上下面に活物質層7を配置することで作製され、該他方の電極4の集電体9に導電性のリード15が一体形成されていて、該リード15が、前記袋状のセパレータ6における四辺のうち、いずれかの一辺側17からセパレータ6外へ導出されている。セパレータ6の一辺側17には、他方の電極4のリード15の基端側を覆うための被覆部20が延出されているものとすることができる。   The other electrode 4 accommodated in the bag-like separator 6 is produced by arranging the active material layer 7 on the upper and lower surfaces of the sheet-like current collector 9, and the current collector 9 of the other electrode 4 is formed on the current collector 9. A conductive lead 15 is integrally formed, and the lead 15 is led out of the separator 6 from one side 17 of the four sides of the bag-like separator 6. A covering portion 20 for covering the base end side of the lead 15 of the other electrode 4 may be extended to one side 17 of the separator 6.

本発明の扁平型電池においては、電極体1の一方の電極5は、集電体11の一方の面に金属製の活物質層10を配置して、活物質層10を配置していない他方の面を内側にして集電体11を上下に折り畳むことで、該電極5の上下両側に活物質層10がそれぞれ配置されるので、例えば折り畳みの際に活物質層10の折り目の位置を適正に管理することで、一方の電極5の上下の活物質層10の位置関係を正確に合わせることができる。   In the flat battery of the present invention, one electrode 5 of the electrode body 1 has a metal active material layer 10 disposed on one surface of a current collector 11 and the other one on which the active material layer 10 is not disposed. The active material layers 10 are arranged on both the upper and lower sides of the electrode 5 by folding the current collector 11 up and down with the surface of the electrode 5 inward, so that, for example, the folding position of the active material layer 10 is set appropriately when folded. By managing to, the positional relationship between the upper and lower active material layers 10 of one electrode 5 can be accurately matched.

つまり、本発明では、一方の電極5の活物質層10は、活物質を集電体11に塗布して形成する場合よりも高い寸法精度が得られる金属板(又は金属箔)で構成されており、また折り畳んだことで一方の電極5の上下に配置される活物質層10a・10b(図5(b)参照)は、折り畳む前において集電体11の同一の面にそれぞれ配置されるため、集電体11に活物質層10a・10bを配置する操作が同一の工程で行える。したがって、例えば集電体11の上面に活物質層10aを配置する工程と、集電体11の下面に活物質層10bを配置する工程とを別々に行う場合よりも、活物質層10a・10bどうしの位置関係を容易に合わせることができて、該活物質層10a・10bの位置関係のずれが抑えられる。このため、例えば上側の活物質層10aの位置から下側の活物質層10bの位置を正確に把握できる。これにて、例えば上側の活物質層10aの位置のみに基づいて、該一方の電極5の上下に重なる他方の電極4の活物質層7の対向位置をそれぞれ合わしても、下側の活物質層10bも下側の他方の電極4の活物質層7に適正に対向する。   In other words, in the present invention, the active material layer 10 of one electrode 5 is composed of a metal plate (or metal foil) that can obtain higher dimensional accuracy than the case where the active material is applied to the current collector 11 and formed. In addition, the active material layers 10a and 10b (see FIG. 5B) disposed above and below the one electrode 5 by being folded are respectively disposed on the same surface of the current collector 11 before being folded. The operation of arranging the active material layers 10a and 10b on the current collector 11 can be performed in the same process. Therefore, for example, the active material layers 10a and 10b are arranged more than when the step of disposing the active material layer 10a on the upper surface of the current collector 11 and the step of disposing the active material layer 10b on the lower surface of the current collector 11 are performed separately. The positional relationship between the two can be easily matched, and the displacement of the positional relationship between the active material layers 10a and 10b can be suppressed. Therefore, for example, the position of the lower active material layer 10b can be accurately grasped from the position of the upper active material layer 10a. Thus, for example, based on only the position of the upper active material layer 10a, even if the opposing positions of the active material layer 7 of the other electrode 4 overlapping above and below the one electrode 5 are matched, the lower active material The layer 10b also properly opposes the active material layer 7 of the other electrode 4 on the lower side.

すなわち、本発明は、一方の電極5の下側の活物質層10bを、下側の他方の電極4の活物質層7の対向位置に合わせる手間を省略できる。この分だけ本発明は、正負の電極4・5の活物質層7・10どうしの対向位置を合わせる手間を軽減できながら、正極4と負極5とを適正に対向させて、放電電流を確実に大きくすることができることになる。ここで、前記位置合わせを良好に行うためには、活物質層10a・10bどうしが繋がっていることが好ましいが、集電体11の折り目部分で活物質層10が適正に折れ曲がるためには、集電体11の折り目部分において活物質層10が切れていて、活物質層10a・10bどうしが離れて配置されていてもよい。   That is, according to the present invention, the trouble of matching the lower active material layer 10b of one electrode 5 with the position opposite to the active material layer 7 of the lower electrode 4 can be omitted. In this way, the present invention can reduce the trouble of aligning the facing positions of the active material layers 7 and 10 of the positive and negative electrodes 4 and 5, while making the positive electrode 4 and the negative electrode 5 properly face each other to ensure the discharge current. It can be enlarged. Here, in order to satisfactorily perform the alignment, it is preferable that the active material layers 10a and 10b are connected to each other. However, in order for the active material layer 10 to be appropriately bent at the fold portion of the current collector 11, The active material layer 10 may be cut at the crease portion of the current collector 11, and the active material layers 10 a and 10 b may be disposed apart from each other.

扁平四角形状の袋状のセパレータ6内に他方の電極4が収容されていると、他方の電極4が一方の電極5に接触して正極4と負極5とが短絡することを確実に防止できる。しかも、セパレータ6と該セパレータ6内の他方の電極4とを一つのユニットとして積層できるために、例えば正極4と負極5とセパレータ6とを別々にして重ねる場合に比して、電極体1を効率よく作製することができる。これにて、扁平型電池の製造効率が向上する。   When the other electrode 4 is accommodated in the flat rectangular bag-shaped separator 6, it is possible to reliably prevent the other electrode 4 from contacting the one electrode 5 and short-circuiting the positive electrode 4 and the negative electrode 5. . In addition, since the separator 6 and the other electrode 4 in the separator 6 can be stacked as a single unit, the electrode body 1 is formed in comparison with the case where the positive electrode 4, the negative electrode 5 and the separator 6 are stacked separately, for example. It can be produced efficiently. Thereby, the manufacturing efficiency of the flat battery is improved.

また、他方の電極4が、扁平四角形状の袋状のセパレータ6の上下部分6a・6bで挟み込まれるので、他方の電極4はセパレータ6に対して動き難くなる。したがって、セパレータ6に対して一方の電極5を位置合わせするだけで、正負の電極4・5の活物質層7・10どうしを適正に対向させることができる。つまり、本発明は、一方の電極5とセパレータ6との位置合わせを行いながら積層するだけで、他方の電極4と一方の電極5とセパレータ6との三つの位置関係が揃うことになる。これにて、扁平型電池の製造効率が向上する。   Further, since the other electrode 4 is sandwiched between the upper and lower portions 6 a and 6 b of the flat rectangular bag-shaped separator 6, the other electrode 4 is difficult to move with respect to the separator 6. Therefore, the active material layers 7 and 10 of the positive and negative electrodes 4 and 5 can be properly opposed to each other only by positioning one electrode 5 with respect to the separator 6. That is, according to the present invention, the three electrodes are aligned while the other electrode 4, the one electrode 5, and the separator 6 are aligned by simply stacking them while aligning the one electrode 5 and the separator 6. Thereby, the manufacturing efficiency of the flat battery is improved.

一枚のシート材12を上下に折り畳んでセパレータ6の上側部分6aと下側部分6bとの周縁どうしを接着することで袋状のセパレータ6が形成されていると、折り畳んだシート材12において、折り目16を除く他の二辺又は三辺を接着するだけで袋状に形成できるので、この分だけ袋状のセパレータ6を作製するための手間を低減できる。   When the bag-like separator 6 is formed by folding a single sheet material 12 up and down and bonding the peripheral edges of the upper portion 6a and the lower portion 6b of the separator 6, Since it can form in a bag shape only by adhere | attaching the other 2 sides or three sides except the crease | fold 16, the labor for producing the bag-shaped separator 6 can be reduced by this amount.

二枚のシート材12を重ね合わせて、これらシート材12の周縁どうしを接着することで袋状のセパレータ6が形成されていると、例えば硬質プラスチック等の折り畳みが容易ではない素材を使って、袋状のセパレータ6を作製することができる。   If the bag-like separator 6 is formed by stacking two sheet materials 12 and bonding the peripheral edges of these sheet materials 12, using a material that is not easy to fold, such as hard plastic, A bag-like separator 6 can be produced.

一方の電極5の集電体11にリード19が一体形成されていると、集電体11とリード19とを同時に作製することができる。つまり、例えばリード19を集電体11とは別体で形成して、該リード19を集電体11に取り付ける場合よりも、電極体1の製造効率が向上する。これにて扁平角型電池の製造効率が向上する。   If the lead 19 is integrally formed with the current collector 11 of one electrode 5, the current collector 11 and the lead 19 can be manufactured simultaneously. That is, for example, the manufacturing efficiency of the electrode body 1 is improved as compared with the case where the lead 19 is formed separately from the current collector 11 and the lead 19 is attached to the current collector 11. This improves the manufacturing efficiency of the flat rectangular battery.

他方の電極4の集電体9にリード15が一体形成され、該リード15が、袋状のセパレータ6の一辺側17から導出され、セパレータ6の一辺側17にリード15の基端側を覆うための被覆部20が延出されていると、集電体9とリード15とを同時に作製することができ、これによっても電極体1の製造効率が向上して、扁平角型電池の製造効率が向上する。また、被覆部20によってリード15が、一方の電極5に接触して短絡すること等を確実に防止することができる。この分だけ扁平型電池の歩留まりがよくなって、扁平角型電池の製造効率が向上する。   A lead 15 is formed integrally with the current collector 9 of the other electrode 4, the lead 15 is led out from one side 17 of the bag-like separator 6, and the base 15 of the lead 15 is covered with the one side 17 of the separator 6. If the covering portion 20 is extended, the current collector 9 and the lead 15 can be manufactured at the same time. This also improves the manufacturing efficiency of the electrode body 1 and increases the manufacturing efficiency of the flat rectangular battery. Will improve. Further, the covering portion 20 can surely prevent the lead 15 from coming into contact with one electrode 5 and short-circuiting. Accordingly, the yield of the flat battery is improved, and the manufacturing efficiency of the flat battery is improved.

図1ないし図6に、本発明に係る扁平型電池を示す。この扁平型電池は、図3に示すように、発電要素の電極体1および非水電解液を扁平四角形状の袋状の外装材2内に収容する。外装材2は、二枚の四角形状のラミネートフィルム3・3の周縁どうしを熱溶着することで袋状に形成される。該ラミネートフィルム3は、例えば、内面側から熱融着性フィルムと金属箔と保護フィルムとを順に積層して形成される。熱融着性フィルムは、変性ポリオレフィンフィルム等からなり、金属箔は、アルミニウム箔やステンレス箔等からなり、保護フィルムは、ポリエステルフィルム等からなる。ラミネートフィルム3の厚さ寸法は約100μmである。本発明に係る扁平型電池は、縦方向の寸法が30mm、横方向の寸法が20mmである。   1 to 6 show a flat battery according to the present invention. As shown in FIG. 3, this flat battery accommodates the electrode body 1 of the power generation element and the non-aqueous electrolyte in a flat rectangular bag-shaped exterior member 2. The exterior material 2 is formed in a bag shape by thermally welding the peripheral edges of two rectangular laminate films 3 and 3. The laminate film 3 is formed, for example, by laminating a heat-fusible film, a metal foil, and a protective film in this order from the inner surface side. The heat-fusible film is made of a modified polyolefin film or the like, the metal foil is made of an aluminum foil or a stainless steel foil, and the protective film is made of a polyester film or the like. The thickness dimension of the laminate film 3 is about 100 μm. The flat battery according to the present invention has a vertical dimension of 30 mm and a horizontal dimension of 20 mm.

電極体1は、図1に示すように、四角形状の正極4(図4参照)と四角形状の負極5(図5(a)参照)とをセパレータ6を介在させた状態で上下方向に交互に複数積層することで直方体形状に構成される。図1では、正極4が3層、負極5が4層になっている。正極4は、二酸化マンガン等の正極活物質を含有する正極活物質層7を、アルミニウムやステンレス等の金属箔等からなるシート状の正極集電体9の上下両面に配置することで作製される。正極4の厚さ寸法は150μmである。   As shown in FIG. 1, the electrode body 1 has a rectangular positive electrode 4 (see FIG. 4) and a square negative electrode 5 (see FIG. 5A) alternately in the vertical direction with a separator 6 interposed therebetween. A plurality of layers are stacked to form a rectangular parallelepiped shape. In FIG. 1, the positive electrode 4 has three layers and the negative electrode 5 has four layers. The positive electrode 4 is produced by disposing a positive electrode active material layer 7 containing a positive electrode active material such as manganese dioxide on the upper and lower surfaces of a sheet-like positive electrode current collector 9 made of a metal foil such as aluminum or stainless steel. . The thickness dimension of the positive electrode 4 is 150 μm.

負極5は、図1および図5(b)に示すように、金属リチウムやリチウムとアルミニウムとの合金等の金属板製の負極活物質層10を、銅等の金属箔等からなるシート状の負極集電体11の上下両面における一方の面に配置し、負極活物質層10を配置していない他方の面を内側にして負極集電体11を上下に折り畳んで構成してある。これにて、負極活物質層10が負極5の上下両側にそれぞれ配置される。負極5の負極活物質層10の厚さ寸法は50μm、負極集電体11の厚さ寸法は8〜20μmである。   As shown in FIG. 1 and FIG. 5 (b), the negative electrode 5 has a sheet-like negative electrode active material layer 10 made of a metal plate such as metal lithium or an alloy of lithium and aluminum, and is made of a metal foil such as copper. The negative electrode current collector 11 is arranged on one surface of both the upper and lower surfaces of the negative electrode current collector 11 and the negative electrode current collector 11 is folded up and down with the other surface where the negative electrode active material layer 10 is not disposed inside. Thus, the negative electrode active material layers 10 are arranged on both the upper and lower sides of the negative electrode 5. The thickness dimension of the negative electrode active material layer 10 of the negative electrode 5 is 50 μm, and the thickness dimension of the negative electrode current collector 11 is 8 to 20 μm.

最上段の負極5は、負極集電体11を折り畳んでおらず、負極集電体11の下面側のみに負極活物質層10が配置される。また最下段の負極5も、負極集電体11を折り畳んでおらず、負極集電体11の上面側のみに負極活物質層10が配置される。なお、最上段および最下段の負極5の負極集電体11は、外装材2の内面側の熱融着性フィルムにそれぞれ接触するが、該熱融着性フィルムが絶縁性を有するために外装材2の金属箔と短絡することがない。   In the uppermost negative electrode 5, the negative electrode current collector 11 is not folded, and the negative electrode active material layer 10 is disposed only on the lower surface side of the negative electrode current collector 11. Further, the negative electrode 5 in the lowermost stage also does not fold the negative electrode current collector 11, and the negative electrode active material layer 10 is disposed only on the upper surface side of the negative electrode current collector 11. Note that the negative electrode current collectors 11 of the uppermost and lowermost negative electrodes 5 are in contact with the heat-fusible film on the inner surface side of the outer packaging material 2 respectively. There is no short circuit with the metal foil of the material 2.

セパレータ6は、絶縁性に優れたポリエチレンやポリプロピレン等からなる微多孔性薄膜で構成してあって、リチウムイオンが透過可能になっている。つまり、セパレータ6は、図4に示すように、一枚の長方形状の微多孔性薄膜のシート材12を、正極4を挟み込むようにして上下に折り畳み、該セパレータ6の上側部分6aと下側部分6bとの周縁どうしを熱溶着等によって接着することで扁平四角形状の袋状(図6参照)に形成される。これにて、扁平四角形状の袋状のセパレータ6内に正極4が収容される。袋状のセパレータ6の縦横方向の各寸法は、正極4の縦横方向の各寸法よりも大きくなっている。シート材12の厚さ寸法は16μmである。   The separator 6 is composed of a microporous thin film made of polyethylene, polypropylene or the like having excellent insulating properties, and is capable of transmitting lithium ions. That is, as shown in FIG. 4, the separator 6 is formed by folding a sheet material 12 of a rectangular microporous thin film vertically so as to sandwich the positive electrode 4, and the upper portion 6 a and the lower side of the separator 6. A flat rectangular bag shape (see FIG. 6) is formed by bonding the peripheral edges of the portion 6b with each other by heat welding or the like. Thus, the positive electrode 4 is accommodated in the flat rectangular bag-shaped separator 6. The vertical and horizontal dimensions of the bag-like separator 6 are larger than the vertical and horizontal dimensions of the positive electrode 4. The thickness dimension of the sheet material 12 is 16 μm.

各正極4の正極集電体9には、図1および図6に示すように、横方に延びる導電性の正極リード15が一体形成される。正極リード15は、セパレータ6においてシート材12の折り目16の反対側に位置する一辺側17からセパレータ6外へ導出されている。各負極5の負極集電体11には、図2および図6に示すように、横方に延びる導電性の負極リード19が一体形成される。   As shown in FIGS. 1 and 6, a conductive positive electrode lead 15 extending in the lateral direction is integrally formed on the positive electrode current collector 9 of each positive electrode 4. The positive electrode lead 15 is led out of the separator 6 from one side 17 located on the opposite side of the fold 16 of the sheet material 12 in the separator 6. As shown in FIGS. 2 and 6, a conductive negative electrode lead 19 extending in the lateral direction is integrally formed on the negative electrode current collector 11 of each negative electrode 5.

前記セパレータ6の一辺側17には、図4および図6に示すように、正極リード15の基端側を覆うための被覆部20が延出される。つまり、セパレータ6の上側部分6aおよび下側部分6bの一辺側17には、上側被覆部20aおよび下側被覆部20bがそれぞれ延出しており、上下の被覆部20a・20bによって正極リード15の基端側が上下から挟まれて被覆される(図1参照)。各正極4の正極リード15は、図1に示すように、先端側を一まとめにした状態で、正極タブ21の基端部に超音波溶接等で接続される。正極タブ21は、アルミニウムとニッケルとのクラッド材等からなり、図3に示すように正極タブ21の先端側が外装材2の一辺22から導出される。   As shown in FIGS. 4 and 6, a covering portion 20 for covering the proximal end side of the positive electrode lead 15 is extended to one side 17 of the separator 6. That is, the upper covering portion 20a and the lower covering portion 20b extend on one side 17 of the upper portion 6a and the lower portion 6b of the separator 6, respectively. The end side is sandwiched and covered from above and below (see FIG. 1). As shown in FIG. 1, the positive electrode lead 15 of each positive electrode 4 is connected to the base end portion of the positive electrode tab 21 by ultrasonic welding or the like in a state where the distal end side is put together. The positive electrode tab 21 is made of a clad material of aluminum and nickel, and the leading end side of the positive electrode tab 21 is led out from one side 22 of the exterior material 2 as shown in FIG.

各負極5の負極リード19は、図2に示すように、先端側を一まとめにした状態で、負極タブ23の基端部に超音波溶接等で接続される。負極タブ23は、銅とニッケルとのクラッド材等からなり、図3に示すように負極タブ23の先端側が外装材2の一辺22から導出される。   As shown in FIG. 2, the negative electrode lead 19 of each negative electrode 5 is connected to the base end portion of the negative electrode tab 23 by ultrasonic welding or the like in a state where the distal end side is put together. The negative electrode tab 23 is made of a clad material of copper and nickel, and the leading end side of the negative electrode tab 23 is led out from one side 22 of the exterior material 2 as shown in FIG.

負極5の負極活物質層10を正極4の正極活物質層7に確実に対面させて、積層時の位置ずれに起因する短絡等を防止できるように、負極活物質層10の縦横方向の各寸法が、正極活物質層7の縦横方向の各寸法よりも大きくなっている。さらに負極活物質層10の縦横方向の各寸法は、袋状のセパレータ6の縦横方向の各寸法以上になっている。これにて、負極5でセパレータ6の上下両面のいずれか一方の面全体を覆ったときには、該負極5の負極活物質層10が、セパレータ6内の正極4の正極活物質層7に確実に対面することになる。   Each of the negative electrode active material layers 10 in the vertical and horizontal directions is configured so that the negative electrode active material layer 10 of the negative electrode 5 faces the positive electrode active material layer 7 of the positive electrode 4 and the short circuit due to misalignment during lamination can be prevented. The dimension is larger than each dimension of the positive electrode active material layer 7 in the vertical and horizontal directions. Furthermore, the vertical and horizontal dimensions of the negative electrode active material layer 10 are greater than the vertical and horizontal dimensions of the bag-like separator 6. Thus, when the negative electrode 5 covers the entire upper or lower surface of the separator 6, the negative electrode active material layer 10 of the negative electrode 5 is reliably attached to the positive electrode active material layer 7 of the positive electrode 4 in the separator 6. You will face each other.

本発明の扁平型電池の組み立てを図1および図6を参照して説明する。図6に示すように、最上段の負極5と最下段の負極5との間に、正極4を収容した袋状のセパレータ6と、負極5とを交互に複数積層する。次いで、各正極4の正極リード15の先端側どうしを一まとめに束ねた状態で、超音波溶接等で正極タブ21に接続する。また、各負極5の負極リード26の先端側どうしを一まとめに束ねた状態で、超音波溶接等で負極タブ23に接続する。   The assembly of the flat battery of the present invention will be described with reference to FIGS. As shown in FIG. 6, between the uppermost negative electrode 5 and the lowermost negative electrode 5, a plurality of bag-like separators 6 containing positive electrodes 4 and negative electrodes 5 are alternately stacked. Next, in a state where the leading ends of the positive electrode leads 15 of each positive electrode 4 are bundled together, they are connected to the positive electrode tab 21 by ultrasonic welding or the like. In addition, in a state where the leading ends of the negative electrode leads 26 of each negative electrode 5 are bundled together, they are connected to the negative electrode tab 23 by ultrasonic welding or the like.

そして、電極体1を挟み込むように二枚のラミネートフィルム3・3を上下に重ねるとともに、該上下のラミネートフィルム3・3の四辺のうち、外装材2の一辺22を構成する上下のラミネートフィルム3・3の各一辺側で、正極タブ21および負極タブ23を挟み込む。この状態で、上下のラミネートフィルム3・3は、前記外装材2の一辺22を構成するラミネートフィルム3・3の一辺を含む三辺が熱溶着される。これにて、正極タブ21および負極タブ23が、外装材2の一辺22に固定される。   Then, the two laminated films 3 and 3 are stacked one above the other so as to sandwich the electrode body 1, and the upper and lower laminated films 3 constituting one side 22 of the exterior material 2 among the four sides of the upper and lower laminated films 3 and 3. -The positive electrode tab 21 and the negative electrode tab 23 are sandwiched on each side of 3. In this state, the upper and lower laminating films 3 and 3 are heat-welded on three sides including one side of the laminating film 3 and 3 constituting one side 22 of the exterior material 2. Thus, the positive electrode tab 21 and the negative electrode tab 23 are fixed to one side 22 of the exterior material 2.

次いで、熱溶着されていない上下のラミネートフィルム3・3の残りの一辺から非水電解液を注入したのち、該ラミネートフィルム3・3の残りの一辺が熱溶着される。これにて、袋状の外装材2が密封される。これによって図3に示す本発明の扁平型電池の組み立てが完了する。非水電解液は、例えば、プロピレンカーボネートとジメトキシエタンとを混合した溶媒に、LiCF3 SO3 を溶解させて作製した。 Next, after injecting a non-aqueous electrolyte from the remaining one side of the upper and lower laminated films 3 and 3 that are not thermally welded, the remaining one side of the laminated films 3 and 3 is thermally welded. Thereby, the bag-shaped exterior material 2 is sealed. This completes the assembly of the flat battery of the present invention shown in FIG. The non-aqueous electrolyte was prepared, for example, by dissolving LiCF 3 SO 3 in a solvent in which propylene carbonate and dimethoxyethane were mixed.

このように、電極体1の負極5は、負極集電体11および負極活物質層10を上下に折り畳むことで該負極5の上下両側に繋がる負極活物質層10を配置している。このため、折り畳みの際に負極活物質層10の折り目の位置を適正に管理することで、負極5の上下の負極活物質層10の位置関係を正確に合わせることができる。つまり、図5(b)に示すように、折り畳んだことで上下に配置される負極活物質層10a・10bは、折り畳む前において負極集電体11の同一の面にそれぞれ配置されるため、負極集電体11に負極活物質層10a・10bを配置する操作が同一の工程で行える。したがって、例えば負極集電体11の上面に負極活物質層10aを配置する工程と、集電体11の下面に負極活物質層10bを配置する工程とを別々に行う場合よりも、負極活物質層10a・10bどうしの位置関係を容易に合わせることができて、負極活物質層10a・10bの位置関係のずれが抑えられる。したがって、上側の負極活物質層10aの位置から下側の負極活物質層10bの位置を正確に把握できる。これにて、例えば上側の負極活物質層10aの位置のみに基づいて、該負極5の上下に重なる正極4の正極活物質層7の対向位置をそれぞれ合わしても、下側の負極活物質層10bも下側の正極4の正極活物質層7に適正に対向する。つまり、本発明は、負極5の下側の負極活物質層10bを、下側の他方の電極4の活物質層7の対向位置に合わせる手間を省略できる。   Thus, the negative electrode 5 of the electrode body 1 has the negative electrode active material layer 10 connected to the upper and lower sides of the negative electrode 5 by folding the negative electrode current collector 11 and the negative electrode active material layer 10 up and down. For this reason, the positional relationship of the upper and lower negative electrode active material layers 10 of the negative electrode 5 can be accurately matched by appropriately managing the positions of the folds of the negative electrode active material layer 10 during folding. That is, as shown in FIG. 5B, the negative electrode active material layers 10a and 10b that are arranged one above the other by being folded are arranged on the same surface of the negative electrode current collector 11 before being folded. The operation of disposing the negative electrode active material layers 10a and 10b on the current collector 11 can be performed in the same process. Therefore, for example, the negative electrode active material is more than the case where the step of disposing the negative electrode active material layer 10a on the upper surface of the negative electrode current collector 11 and the step of disposing the negative electrode active material layer 10b on the lower surface of the current collector 11 are performed separately. The positional relationship between the layers 10a and 10b can be easily matched, and deviation of the positional relationship between the negative electrode active material layers 10a and 10b can be suppressed. Therefore, the position of the lower negative electrode active material layer 10b can be accurately grasped from the position of the upper negative electrode active material layer 10a. Thus, for example, based on only the position of the upper negative electrode active material layer 10a, even if the opposing positions of the positive electrode active material layer 7 of the positive electrode 4 overlapping above and below the negative electrode 5 are matched, the lower negative electrode active material layer 10b also properly faces the positive electrode active material layer 7 of the lower positive electrode 4. That is, according to the present invention, it is possible to omit the trouble of matching the lower negative electrode active material layer 10b of the negative electrode 5 with the position opposite to the active material layer 7 of the other electrode 4 on the lower side.

また、正極4が袋状のセパレータ6内に収容されるので、正極4が負極5に接触して正極4と負極5とが短絡することを確実に防止できる。正極4が扁平袋状のセパレータ6の上下部分6a・6bで挟み込まれているために、正極4がセパレータ6に対して動き難くなっている。したがって、セパレータ6と正極4との位置関係を特定できる。このため、例えば袋状のセパレータ6の縦横方向の各寸法と、負極5の縦横方向の各寸法とを等しくしておくことで、セパレータ6と負極5との間での位置合わせを行うだけで、正極4と負極5とを適正に対向させることができる。   Moreover, since the positive electrode 4 is accommodated in the bag-shaped separator 6, it can prevent reliably that the positive electrode 4 contacts the negative electrode 5 and the positive electrode 4 and the negative electrode 5 are short-circuited. Since the positive electrode 4 is sandwiched between the upper and lower portions 6 a and 6 b of the flat bag-shaped separator 6, the positive electrode 4 is difficult to move with respect to the separator 6. Therefore, the positional relationship between the separator 6 and the positive electrode 4 can be specified. For this reason, for example, by making the vertical and horizontal dimensions of the bag-shaped separator 6 equal to the vertical and horizontal dimensions of the negative electrode 5, only alignment between the separator 6 and the negative electrode 5 is performed. The positive electrode 4 and the negative electrode 5 can be appropriately opposed to each other.

正極4と負極5とを上下方向に複数積層して電極体1を形成してあるので、正極4と負極5との対向面積が大きくなり、これに伴って放電電流を大きくすることができる。電極体1がラミネートフィルム3製の外装材2内に収容されているので、扁平型電池を湾曲させる等の電池の姿勢の自由化を図ることができる。   Since the electrode body 1 is formed by laminating a plurality of the positive electrodes 4 and the negative electrodes 5 in the vertical direction, the facing area between the positive electrodes 4 and the negative electrodes 5 is increased, and the discharge current can be increased accordingly. Since the electrode body 1 is accommodated in the exterior material 2 made of the laminate film 3, it is possible to achieve liberalization of the battery posture such as bending the flat battery.

なお、正極リード15は、セパレータ6におけるシート材12の折り目16および前記一辺側17を除く他の二辺のいずれかからセパレータ6外へ導出してもよい。セパレータ6は、例えば二枚のシート材12を重ね合わせて、これらシート材12の周縁どうしを接着することで扁平四角形状の袋状に形成してもよい。また、正極4の厚さ寸法および縦横方向の各寸法よりも僅かに厚さ寸法および縦横方向の各寸法が大きい扁平四角形状の枠体を設け、該枠体内に正極4を収容した状態で、枠体の上下面にそれぞれシート材12を接着して、扁平四角形状の袋状のセパレータ6を形成してもよい。該枠体は、絶縁性の樹脂等で形成される。   The positive electrode lead 15 may be led out of the separator 6 from one of the other two sides excluding the fold 16 of the sheet material 12 and the one side 17 in the separator 6. The separator 6 may be formed in a flat rectangular bag shape by, for example, stacking two sheet materials 12 and bonding the peripheral edges of these sheet materials 12 together. In addition, a flat rectangular frame having a slightly larger thickness and vertical and horizontal dimensions than the thickness and vertical and horizontal dimensions of the positive electrode 4 is provided, and the positive electrode 4 is accommodated in the frame. The sheet material 12 may be bonded to the upper and lower surfaces of the frame to form the flat rectangular bag-shaped separator 6. The frame is made of an insulating resin or the like.

正極リード15および負極リード19を正極4および負極5とは別体に形成しておき、この正極リード15および負極リード19を正極4および負極5にそれぞれ溶接してもよい。セパレータ6の被覆部20に代えて、絶縁テープで正極4の正極リード15の基端側を覆ってもよい。   The positive electrode lead 15 and the negative electrode lead 19 may be formed separately from the positive electrode 4 and the negative electrode 5, and the positive electrode lead 15 and the negative electrode lead 19 may be welded to the positive electrode 4 and the negative electrode 5, respectively. Instead of the covering portion 20 of the separator 6, the base end side of the positive electrode lead 15 of the positive electrode 4 may be covered with an insulating tape.

本発明に係る扁平型電池を示す図3のA−A線断面図である。It is the sectional view on the AA line of FIG. 3 which shows the flat battery which concerns on this invention. 図3のB−B線断面図である。FIG. 4 is a sectional view taken along line BB in FIG. 3. 本発明の扁平型電池の斜視図である。It is a perspective view of the flat battery of the present invention. 本発明に係るセパレータの作製を説明するための斜視図である。It is a perspective view for demonstrating preparation of the separator which concerns on this invention. (a)は本発明に係る負極の斜視図、(b)は負極の側面図である。(A) is a perspective view of the negative electrode which concerns on this invention, (b) is a side view of a negative electrode. 本発明に係る電極体の組み立てを説明するための斜視図である。It is a perspective view for demonstrating the assembly of the electrode body which concerns on this invention.

符号の説明Explanation of symbols

1 電極体
2 外装材
3 ラミネートフィルム
4 正極
5 負極
6 セパレータ
6a 上側部分
6b 下側部分
7 正極活物質層
9 正極集電体
10 負極活物質層
11 負極集電体
12 シート材
15 正極リード
17 一辺側
19 負極リード
20 被覆部
DESCRIPTION OF SYMBOLS 1 Electrode body 2 Exterior material 3 Laminate film 4 Positive electrode 5 Negative electrode 6 Separator 6a Upper part 6b Lower part 7 Positive electrode active material layer 9 Positive electrode current collector 10 Negative electrode active material layer 11 Negative electrode current collector 12 Sheet material 15 Positive electrode lead 17 One side Side 19 Negative electrode lead 20 Covering part

Claims (6)

正極と負極との間にセパレータを介在させた状態で上下方向に複数積層した電極体を、ラミネートフィルム製の袋状の外装材内に収容した扁平型電池であって、
前記正極および前記負極のうちの一方の電極は、シート状の集電体の一方の面に金属製の活物質層を配置して、該活物質層を配置していない他方の面を内側にして前記集電体を上下に折り畳むことで、前記一方の電極の上下両側に前記活物質層がそれぞれ配置されていることを特徴とする扁平型電池。
A flat battery in which a plurality of vertically stacked electrode bodies with a separator interposed between a positive electrode and a negative electrode are housed in a bag-shaped exterior material made of a laminate film,
One electrode of the positive electrode and the negative electrode has a metal active material layer disposed on one surface of a sheet-like current collector, and the other surface on which the active material layer is not disposed is on the inside. The flat battery is characterized in that the current collector is folded up and down so that the active material layers are respectively disposed on the upper and lower sides of the one electrode.
前記セパレータが、扁平四角形状の袋状に形成されていて、該袋状のセパレータ内に前記正極および前記負極のうちの他方の電極が収容されている請求項1記載の扁平型電池。   The flat battery according to claim 1, wherein the separator is formed in a flat rectangular bag shape, and the other electrode of the positive electrode and the negative electrode is accommodated in the bag-shaped separator. 前記セパレータは、一枚のシート材を上下に折り畳んで該セパレータの上側部分と下側部分との周縁どうしを接着することで、扁平四角形状の袋状に形成されている請求項2記載の扁平型電池。   3. The flat shape according to claim 2, wherein the separator is formed in a flat rectangular bag shape by folding one sheet material up and down and bonding the peripheral edges of the upper portion and the lower portion of the separator. Type battery. 前記セパレータは、二枚のシート材を重ね合わせて、これらシート材の周縁どうしを接着することで、扁平四角形状の袋状に形成されている請求項2記載の扁平型電池。   The flat battery according to claim 2, wherein the separator is formed into a flat rectangular bag shape by overlapping two sheet materials and bonding the peripheral edges of the sheet materials. 前記一方の電極の集電体に、導電性のリードが一体形成されている請求項1ないし4のいずれかに記載の扁平型電池。   The flat battery according to any one of claims 1 to 4, wherein a conductive lead is integrally formed on the current collector of the one electrode. 前記袋状のセパレータ内に収容される前記他方の電極は、シート状の集電体の上下面に活物質層を配置することで作製され、
前記他方の電極の集電体には、導電性のリードが一体形成されていて、該リードが、前記袋状のセパレータにおける四辺のうち、いずれかの一辺側から前記セパレータ外へ導出されており、
前記セパレータの前記一辺側には、前記他方の電極の前記リードの基端側を覆うための被覆部が延出されている請求項2ないし5のいずれかに記載の扁平型電池。
The other electrode housed in the bag-shaped separator is produced by disposing an active material layer on the upper and lower surfaces of a sheet-shaped current collector,
A conductive lead is integrally formed on the current collector of the other electrode, and the lead is led out of the separator from one of the four sides of the bag-shaped separator. ,
The flat battery according to any one of claims 2 to 5, wherein a covering portion for covering a base end side of the lead of the other electrode is extended on the one side of the separator.
JP2008065517A 2008-03-14 2008-03-14 Flat battery Pending JP2009224102A (en)

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