JP6046486B2 - Secondary battery and assembled battery - Google Patents

Secondary battery and assembled battery Download PDF

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JP6046486B2
JP6046486B2 JP2012283744A JP2012283744A JP6046486B2 JP 6046486 B2 JP6046486 B2 JP 6046486B2 JP 2012283744 A JP2012283744 A JP 2012283744A JP 2012283744 A JP2012283744 A JP 2012283744A JP 6046486 B2 JP6046486 B2 JP 6046486B2
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negative electrode
separator
active material
thickness direction
electrode active
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JP2014127374A (en
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敏也 土生
敏也 土生
真登 向山
真登 向山
英世 戎崎
英世 戎崎
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Toyota Motor Corp
Soken Inc
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Toyota Motor 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

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Description

本発明は、正極活物質層及び負極活物質層並びにこれらの間に介在するセパレータを有する電極体と、この電極体内に含浸された電解液と、電極体及び電解液を収容する電池ケースとを備える二次電池、及び、このような二次電池を複数備える組電池に関する。   The present invention includes an electrode body having a positive electrode active material layer, a negative electrode active material layer, and a separator interposed therebetween, an electrolyte solution impregnated in the electrode body, and a battery case containing the electrode body and the electrolyte solution. The present invention relates to a secondary battery provided and an assembled battery including a plurality of such secondary batteries.

正極活物質層を有する帯状の正極板と負極活物質層を有する帯状の負極板とをセパレータを介して扁平型や円筒状に捲回した捲回電極体や、正極活物質層と負極活物質層とがセパレータを介して交互に積層された積層型電極体を備えた二次電池が知られている。これらの電極体は電解液と共に電池ケースに収容され、電極体内には電解液が含浸されている。
このような二次電池に関し、セパレータの表面に凹凸を設けることにより、電池性能を改善したものがある。例えば、特許文献１には、セパレータとして、表面を凹凸状に加工した微多孔膜を使用した電池が開示されている。このように、セパレータを凹凸状に加工することによって、凸部で正極と負極の間の距離を確保して、これらの間の接触を防止する一方、凹部によって電解液の含浸性を良くして、電池特性を改善している。 A wound electrode body in which a strip-like positive electrode plate having a positive electrode active material layer and a strip-like negative electrode plate having a negative electrode active material layer are wound into a flat shape or a cylindrical shape via a separator, or a positive electrode active material layer and a negative electrode active material 2. Description of the Related Art Secondary batteries having a stacked electrode body in which layers are alternately stacked via separators are known. These electrode bodies are housed in a battery case together with an electrolytic solution, and the electrode body is impregnated with the electrolytic solution.
Regarding such a secondary battery, there is a battery whose battery performance is improved by providing irregularities on the surface of the separator. For example, Patent Document 1 discloses a battery that uses a microporous film whose surface is processed to be uneven as a separator. In this way, by processing the separator into a concavo-convex shape, the distance between the positive electrode and the negative electrode is ensured at the convex portion, and the contact between them is prevented, while the impregnation of the electrolyte is improved by the concave portion. , Improving battery characteristics.

特開平５−１５１９５１号公報Japanese Patent Laid-Open No. 5-151951

ところで、このような二次電池で充電や放電が行われると、活物質の体積変化によって、電極体の膨張及び収縮が起こることがある。例えば、リチウムイオン二次電池の場合、正極活物質として、ニッケル酸リチウム（ＬｉＮｉＯ2）、マンガン酸リチウム（ＬｉＭｎ2Ｏ4）、コバルト酸リチウム（ＬｉＣｏＯ2）等のリチウム複合酸化物が用いられ、負極活物質として、黒鉛等の炭素系物質が用いられる。 By the way, when charging and discharging are performed in such a secondary battery, the electrode body may expand and contract due to a volume change of the active material. For example, in the case of a lithium ion secondary battery, a lithium composite oxide such as lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 O 4 ), lithium cobaltate (LiCoO 2 ) is used as the positive electrode active material, As the negative electrode active material, a carbon-based material such as graphite is used.

そして、充電時には、正極活物質から放出されたリチウムイオンが、電解液を通じて負極側に移動し、負極活物質に吸蔵される。この際、リチウムイオンを吸蔵した負極活物質が膨張して体積が大きく増加する。この結果、充電時には、負極活物質の膨張により、電極体が膨張する。これとは逆に、放電時には、負極活物質に吸蔵されていたリチウムイオンが放出され再び正極活物質に戻るが、この際、負極活物質は収縮して体積が大きく減少する。この結果、放電時には、負極活物質の収縮により、電極体が収縮する。このように、負極活物質として黒鉛のように充放電により膨張又は収縮してその体積が大きく変化する材料を用いる場合は、この負極活物質の膨張及び収縮により、電極体の膨張及び収縮が起こる。   At the time of charging, lithium ions released from the positive electrode active material move to the negative electrode side through the electrolytic solution and are occluded by the negative electrode active material. At this time, the negative electrode active material that occludes lithium ions expands and the volume greatly increases. As a result, during charging, the electrode body expands due to the expansion of the negative electrode active material. On the contrary, at the time of discharging, lithium ions stored in the negative electrode active material are released and returned to the positive electrode active material again. At this time, the negative electrode active material contracts and the volume is greatly reduced. As a result, during discharge, the electrode body contracts due to contraction of the negative electrode active material. As described above, when a material that expands or contracts due to charge / discharge and changes its volume greatly as the negative electrode active material is used as the negative electrode active material, the expansion and contraction of the electrode body occurs due to the expansion and contraction of the negative electrode active material. .

そして、負極活物質の膨張や収縮による電極体の膨張や収縮が起こると、セパレータと負極活物質層との間に含浸された電解液が移動して、徐々に電極体の外部に押し出されることがある。すると、電極体内の電解液が減少し、電池特性が低下する。
そこで、このようなセパレータと負極活物質との間の電解液が電極体外へ移動するのを抑制することが望まれる。 When the electrode body expands or contracts due to the expansion or contraction of the negative electrode active material, the impregnated electrolyte moves between the separator and the negative electrode active material layer and is gradually pushed out of the electrode body. There is. As a result, the electrolyte in the electrode body decreases, and the battery characteristics deteriorate.
Therefore, it is desired to suppress the electrolyte solution between the separator and the negative electrode active material from moving outside the electrode body.

しかし、特許文献１に記載の実施例のように、セパレータの表面に多数の凹部を格子状に配置したものは、凹部以外の部分が凸部となり、この凸部のみを通じて幅方向中央部分から端縁に繋がる経路が存在する。このため、電極体が膨張、収縮した場合に、電解液が凸部で繋がる経路を伝わって電極体の外部へ漏れ出てしまい、電解液の電極体外への移動を十分に抑制することができない。   However, as in the embodiment described in Patent Document 1, in the case where a large number of recesses are arranged in a grid pattern on the surface of the separator, a portion other than the recesses is a protrusion, and the end from the central portion in the width direction passes only through this protrusion. There is a path leading to the edge. For this reason, when the electrode body expands or contracts, the electrolyte solution leaks out of the electrode body through the path connected by the convex portion, and the movement of the electrolyte solution outside the electrode body cannot be sufficiently suppressed. .

本発明は、かかる問題点に鑑みてなされたものであって、充放電の繰り返しによりセパレータと負極活物質層との間の電解液が電極体の外部へ移動するのを防止して、電池特性の低下を抑制した二次電池、及び、このような二次電池を備えた組電池を提供することを目的とする。   The present invention has been made in view of such a problem, and prevents the electrolyte solution between the separator and the negative electrode active material layer from moving outside the electrode body due to repeated charge and discharge, and has battery characteristics. An object of the present invention is to provide a secondary battery that suppresses the decrease of the battery and an assembled battery including such a secondary battery.

その一態様は、正極活物質層及び負極活物質層並びに上記正極活物質層と上記負極活物質層との間に介在するセパレータを有する電極体と、上記電極体内に含浸された電解液と、上記電極体及び上記電解液を収容する電池ケースと、を備える二次電池であって、上記セパレータは、多孔質樹脂からなる板状のセパレータ本体と、このセパレータ本体の主面のうち上記負極活物質層側の面上の少なくとも一部に形成され、絶縁性無機多孔質材からなる多孔質層とを有し、上記正極活物質層と上記負極活物質層とが当該セパレータを介して厚み方向に互いに重なる作用域内に、上記作用域の周縁の少なくとも一部に沿って延びる帯状で、上記厚み方向のうち上記負極活物質層に向かう負極側に突出し、少なくとも上記厚み方向負極側の一部は上記多孔質層からなる突出帯部、及び、上記突出帯部よりも上記厚み方向負極側に低位で上記セパレータ本体が露出し、上記突出帯部に沿って上記作用域の内側に隣在する低位部を有する二次電池である。 One aspect thereof includes a positive electrode active material layer, a negative electrode active material layer, an electrode body having a separator interposed between the positive electrode active material layer and the negative electrode active material layer, an electrolyte solution impregnated in the electrode body, A battery case containing the electrode body and the electrolyte solution, wherein the separator includes a plate-shaped separator body made of a porous resin, and the negative electrode active body of the main surface of the separator body. A porous layer made of an insulating inorganic porous material formed on at least a part of the surface on the material layer side, and the positive electrode active material layer and the negative electrode active material layer are arranged in the thickness direction via the separator In the working area overlapping each other, in a band shape extending along at least a part of the peripheral edge of the working area, projecting to the negative electrode side toward the negative electrode active material layer in the thickness direction, and at least a part of the thickness direction negative electrode side is the above Projecting strip portion made of porous layer, and, than the protruding strip portion the separator body is exposed at low to the thickness direction negative side, low portion of Tonarizai inside said active area along the projecting strip portions Is a secondary battery.

この二次電池では、セパレータは、作用域内に、この作用域の周縁の少なくとも一部に沿って延びる帯状で、厚み方向負極側に突出する突出帯部、及び、この突出帯部よりも厚み方向負極側に低位（即ち、負極活物質層から離れた側）で、突出帯部に沿って作用域の内側に隣在する低位部を有している。
このため、電極体が膨張、収縮した場合でも、作用域内でかつセパレータと負極活物質層との間の電解液は、作用域の周縁において、厚み方向に高位で負極活物質層に当接あるいは近接する突出帯部を乗り越えて、作用域外へ出にくく、その内側に隣在する厚み方向に低位の低位部に留まる。
これにより、セパレータと負極活物質層との間の電解液が、作用域から電極体の外部へ移動するのが防止される。かくして、充電または放電の繰り返しによる電池特性の低下を抑制した二次電池が得られる。 In this secondary battery, the separator has a band shape extending along at least a part of the peripheral edge of the working area in the working area, and a protruding band part protruding toward the negative electrode in the thickness direction, and the thickness direction from the protruding band part. On the negative electrode side, it has a low level part (that is, a side away from the negative electrode active material layer) and a low level part adjacent to the inside of the working area along the protruding band part.
For this reason, even when the electrode body expands and contracts, the electrolyte solution in the working area and between the separator and the negative electrode active material layer is in contact with the negative electrode active material layer at a high level in the thickness direction at the periphery of the working area. It is difficult to get out of the working area by overcoming the adjacent protruding belt part, and stays at the lower part of the lower part in the thickness direction adjacent to the inner side.
This prevents the electrolytic solution between the separator and the negative electrode active material layer from moving from the working area to the outside of the electrode body. Thus, a secondary battery can be obtained in which deterioration of battery characteristics due to repeated charging or discharging is suppressed.

多孔質層を設けた部位を突出帯部とし、多孔質層を設けない部位を低位部とする。
絶縁性無機多孔質材からなる多孔質層としては、アルミナ、シリカ等の無機セラミック粒子と結着剤とからなるものが挙げられる。例えば、多孔質樹脂からなるセパレータ本体の表面に、アルミナ粒子と結着剤とを溶剤に分散させたペーストをスクリーン印刷して乾燥することにより、突出帯部及び低位部を含む多孔質層をセパレータ本体に一体に形成すると良い。 The sites provided a multi-porous layer and the protruding strip portion, and a portion without the porous layer and the low portion.
Examples of the porous layer made of an insulating inorganic porous material include those made of inorganic ceramic particles such as alumina and silica and a binder. For example, on the surface of a separator body made of a porous resin, a paste in which alumina particles and a binder are dispersed in a solvent is screen-printed and dried, whereby a porous layer including a protruding band portion and a lower portion is separated from the separator. It may be formed integrally with the main body.

さらに、上述の二次電池であって、前記電極体は、前記正極活物質層を有する正極板と前記負極活物質層を有する負極板とを前記セパレータを介して軸線の周りに捲回してなり、上記正極板と上記負極板とが平板状に重なる平板部を有する扁平捲回電極体であり、上記セパレータは、前記作用域内で、かつ、少なくとも上記平板部内に位置する部位に、前記突出帯部であり、上記作用域の上記軸線に沿う軸線方向一方側の周縁に沿って延びる一方側突出帯部、上記突出帯部であり、上記作用域の上記軸線方向他方側の周縁に沿って延びる他方側突出帯部、前記低位部であり、上記一方側突出帯部に沿って隣在する一方側低位部、及び、上記低位部であり、上記他方側突出帯部に沿って隣在する他方側低位部、を有する二次電池とすると良い。   Further, in the above secondary battery, the electrode body is formed by winding a positive electrode plate having the positive electrode active material layer and a negative electrode plate having the negative electrode active material layer around an axis line through the separator. A flat wound electrode body having a flat plate portion in which the positive electrode plate and the negative electrode plate overlap each other in a flat plate shape, and the separator is disposed in the working area and at least in a portion located in the flat plate portion. A one-side protruding band portion extending along a peripheral edge on one side in the axial direction along the axis of the working area, and the protruding band section, and extending along a peripheral edge on the other axial side of the working area. The other side protruding band part, the lower level part, the one side lower level part adjacent along the one side protruding band part, and the other lower side part and adjacent to the other side protruding band part A secondary battery having a lower side portion is preferable.

この二次電池では、電極体は平板部を有する扁平捲回電極体であり、セパレータは、作用域内で、かつ、少なくとも平板部内に位置する部位に、前述の突出帯部である一方側突出帯部及び他方側突出帯部、前述の低位部である一方側低位部及び他方側低位部を有する。
これにより、扁平捲回電極体の平板部から、軸線方向一方側あるいは他方側の外部へセパレータと負極活物質層との間の電解液が移動するのを防止し、確実に電池特性の低下を抑制することができる。 In this secondary battery, the electrode body is a flat wound electrode body having a flat plate portion, and the separator is the one-side protruding band which is the above-described protruding band portion in a region located in the working area and at least within the flat plate portion. And the other side protruding band part, the one side low level part and the other side low level part which are the above-mentioned low level parts.
As a result, the electrolyte solution between the separator and the negative electrode active material layer is prevented from moving from the flat plate portion of the flat wound electrode body to the outside on one side or the other side in the axial direction, thereby reliably reducing the battery characteristics. Can be suppressed.

さらに、上述の二次電池であって、前記セパレータの前記一方側突出帯部及び前記他方側突出帯部は、当該セパレータの長手方向全体に延びてなる二次電池とすると良い。   Further, in the above-described secondary battery, the one side protruding band portion and the other side protruding band portion of the separator may be a secondary battery extending in the entire longitudinal direction of the separator.

この二次電池では、一方側突出帯部及び他方側突出帯部が、作用域内の平板部内に位置する部位のみならず、セパレータの長手方向全体に延びている。これにより、セパレータ及び扁平捲回電極体を容易に形成できる。また、平板部の両側の部位においても、軸線方向一方側あるいは他方側の外部へセパレータと負極活物質との間の電解液が移動するのを防止できる。   In this secondary battery, the one-side protruding band portion and the other-side protruding band portion extend not only in the portion located in the flat plate portion in the working area but also in the entire longitudinal direction of the separator. Thereby, a separator and a flat wound electrode body can be formed easily. Moreover, also in the site | parts of the both sides of a flat plate part, it can prevent that the electrolyte solution between a separator and a negative electrode active material moves outside the axial direction one side or the other side.

さらに、上述の二次電池であって、前記セパレータは、前記一方側低位部と前記他方側低位部との間に、前記厚み方向負極側に突出し、当該セパレータの長手方向に延び、少なくとも上記厚み方向負極側の一部は前記多孔質層からなる複数の帯状凸部と、上記帯状凸部同士の間に位置し、この帯状凸部よりも上記厚み方向負極側に低位で、上記長手方向に延びる一または複数の帯状凹部とを有する二次電池とすると良い。   Further, in the above-described secondary battery, the separator protrudes between the low-side portion on the one side and the low-side portion on the other side in the thickness direction negative electrode side, extends in the longitudinal direction of the separator, and has at least the thickness described above. A part of the direction negative electrode side is located between the plurality of band-shaped convex portions made of the porous layer and the band-shaped convex portions, and is lower than the band-shaped convex portion on the thickness direction negative electrode side and in the longitudinal direction. A secondary battery having one or a plurality of elongated strip-shaped recesses may be used.

この二次電池では、扁平捲回電極体を備える二次電池において、一方側低位部と他方側低位部との間に、セパレータの長手方向に延びる複数の帯状凸部と、この帯状凸部同士の間に位置する一または複数の帯状凹部とを有している。
これにより、一方側低位部と他方側低位部との間に、厚み方向に高位の帯状凸部と厚み方向に低位の帯状凹部とが縞状に並んだパターンとなる。このため、セパレータと負極活物質層との間の電解液は、帯状凸部を乗り越えて軸線方向に移動しにくくなる。
これにより、セパレータと負極活物質層との間の電解液が電極体の軸線方向一方側あるいは他方側の外部へ移動するのを、より適切に防止することができる。
ところで、ハイレート放電あるいはハイレート充電を繰り返すなど、充電と放電のパターンが非対称となると、電解液が電極体内を移動することにより、電極体内の電解液の塩濃度分布に偏りが生じることがある。しかるに、この二次電池は、帯状凸部と帯状凹部とが縞状に並んでいるので、セパレータと負極活物質層との間の電解液の塩濃度分布が、軸線方向に偏るのを防止することもできる。 In this secondary battery, in a secondary battery including a flat wound electrode body, a plurality of belt-shaped convex portions extending in the longitudinal direction of the separator between the one side low-level portion and the other side low-level portion, and the band-shaped convex portions And one or a plurality of belt-like recesses located between the two.
As a result, a pattern is formed in which a high band-shaped convex portion in the thickness direction and a low band-shaped concave portion in the thickness direction are arranged in stripes between the one-side low-level portion and the other-side low-level portion. For this reason, the electrolytic solution between the separator and the negative electrode active material layer is difficult to move in the axial direction over the belt-like convex portion.
Thereby, it can prevent more appropriately that the electrolyte solution between a separator and a negative electrode active material layer moves to the exterior of the axial direction one side or the other side of an electrode body.
By the way, when the charge and discharge patterns become asymmetric, such as when high-rate discharge or high-rate charge is repeated, the electrolyte solution may move within the electrode body, thereby causing a bias in the salt concentration distribution of the electrolyte solution in the electrode body. However, in this secondary battery, since the strip-shaped convex portions and the strip-shaped concave portions are arranged in stripes, the salt concentration distribution of the electrolyte solution between the separator and the negative electrode active material layer is prevented from being biased in the axial direction. You can also.

また、前述の二次電池であって、前記電極体は、前記正極活物質層を有する正極板と前記負極活物質層を有する負極板とを前記セパレータを介して軸線の周りに円筒状に捲回してなる円筒状捲回電極体であり、上記セパレータは、前記突出帯部であり、前記作用域の上記軸線に沿う軸線方向一方側の周縁に沿って延びる一方側突出帯部、上記突出帯部であり、上記作用域の上記軸線方向他方側の周縁に沿って延びる他方側突出帯部、前記低位部であり、上記一方側突出帯部に沿って隣在する一方側低位部、及び、上記低位部であり、上記他方側突出帯部に沿って隣在する他方側低位部、を有する二次電池とすると良い。   Further, in the above-described secondary battery, the electrode body includes a positive electrode plate having the positive electrode active material layer and a negative electrode plate having the negative electrode active material layer, which are cylindrically formed around an axis line through the separator. A cylindrical wound electrode body that is rotated, wherein the separator is the protruding band portion, the one protruding band portion that extends along a peripheral edge on one side in the axial direction along the axis of the working area, and the protruding band The other side protruding band portion extending along the peripheral edge on the other side in the axial direction of the working area, the lower level portion, the one side lower level portion adjacent to the one side protruding band portion, and It is preferable that the secondary battery has the lower portion and the other lower portion adjacent to the other protruding band portion.

この二次電池では、電極体は円筒状捲回電極体であり、セパレータは、前述の突出帯部である一方側突出帯部及び他方側突出帯部、前述の低位部である一方側低位部及び他方側低位部を有する。
これにより、円筒状捲回電極体の軸線方向一方側あるいは他方側の外部へ、セパレータと負極活物質層との間の電解液が移動するのを防止できる。 In this secondary battery, the electrode body is a cylindrical wound electrode body, and the separator is the one-side protruding band portion and the other-side protruding band portion that are the above-described protruding band portions, and the one-side low-level portion that is the above-described low-level portion. And the other side lower portion.
Thereby, it can prevent that the electrolyte solution between a separator and a negative electrode active material layer moves to the exterior of the axial direction one side or the other side of a cylindrical winding electrode body.

さらに、上述の二次電池であって、前記セパレータは、前記一方側低位部と前記他方側低位部との間に、前記厚み方向負極側に突出し、当該セパレータの長手方向に延び、少なくとも上記厚み方向負極側の一部は前記多孔質層からなる複数の帯状凸部と、上記帯状凸部同士の間に位置し、この帯状凸部よりも上記厚み方向負極側に低位で、上記長手方向に延びる一または複数の帯状凹部とを有する二次電池とすると良い。   Further, in the above-described secondary battery, the separator protrudes between the low-side portion on the one side and the low-side portion on the other side in the thickness direction negative electrode side, extends in the longitudinal direction of the separator, and has at least the thickness described above. A part of the direction negative electrode side is located between the plurality of band-shaped convex portions made of the porous layer and the band-shaped convex portions, and is lower than the band-shaped convex portion on the thickness direction negative electrode side and in the longitudinal direction. A secondary battery having one or a plurality of elongated strip-shaped recesses may be used.

この二次電池では、円筒状捲回電極体を備える二次電池において、一方側低位部と他方側低位部との間に、セパレータの長手方向に延びる複数の帯状凸部と、この帯状凸部同士の間に位置する一または複数の帯状凹部とを有している。
これにより、セパレータと負極活物質層との間の電解液が、電極体の軸線方向一方側あるいは他方側の外部へ移動するのを、より適切に防止することができる。加えて、セパレータと負極活物質層との間の電解液の塩濃度分布が、軸線方向に偏るのを防止することもできる。 In the secondary battery, in the secondary battery including the cylindrical wound electrode body, a plurality of belt-shaped protrusions extending in the longitudinal direction of the separator between the one-side low-level portion and the other-side low-level portion, and the band-shaped convex portions It has one or several strip | belt-shaped recessed parts located between each other.
Thereby, it can prevent more appropriately that the electrolyte solution between a separator and a negative electrode active material layer moves to the exterior of the axial direction one side or the other side of an electrode body. In addition, the salt concentration distribution of the electrolyte solution between the separator and the negative electrode active material layer can be prevented from being biased in the axial direction.

また、前述の二次電池であって、前記電極体は、前記セパレータを介して前記正極活物質層と前記負極活物質層とが互いに平行に前記厚み方向に複数積層された積層型電極体であり、上記セパレータは、前記突出帯部であり、前記作用域の周縁に沿う環状の環状突出帯部と、前記低位部であり、上記環状突出帯部に沿って上記作用域の内側に隣在する環状低位部とを有する二次電池とすると良い。   Further, in the above secondary battery, the electrode body is a stacked electrode body in which a plurality of the positive electrode active material layers and the negative electrode active material layers are stacked in parallel in the thickness direction with the separator interposed therebetween. And the separator is the protruding band part, and is an annular annular protruding band part along the periphery of the working area, and the lower part, and is adjacent to the inside of the working area along the annular protruding band part. It is preferable to use a secondary battery having an annular lower portion.

この二次電池では、電極体は積層型電極体であり、セパレータは、前述の突出帯部である環状突出帯部と、前述の低位部である環状低位部とを有する。
これにより、セパレータと負極活物質層との間の電解液が積層型電極体の周縁から外側へ移動するのを防止できる。 In this secondary battery, the electrode body is a laminated electrode body, and the separator has the annular projecting band portion that is the aforementioned projecting band portion and the annular lower portion that is the aforementioned lower portion.
Thereby, it can prevent that the electrolyte solution between a separator and a negative electrode active material layer moves outside from the periphery of a laminated electrode body.

さらに、上述の二次電池であって、前記セパレータは、前記作用域のうち前記環状突出帯部及び前記環状低位部の内側に位置し、前記厚み方向負極側に突出し、少なくとも上記厚み方向負極側の一部は前記多孔質層からなり、環状をなし入れ子状に配置された複数の環状凸部と、上記環状凸部同士の間に位置し、この環状凸部よりも上記厚み方向負極側に低位で、環状をなし入れ子状に配置された複数の環状凹部とを有する二次電池とすると良い。   Furthermore, in the above-described secondary battery, the separator is located inside the annular projecting band portion and the annular lower portion of the working area, protrudes to the thickness direction negative electrode side, and at least the thickness direction negative electrode side Is formed between the plurality of annular projections that are annular and arranged in a nested manner, and are located between the annular projections, and closer to the negative electrode side in the thickness direction than the annular projections. A secondary battery having a plurality of annular recesses arranged in a nested manner at a low level is preferable.

この二次電池では、セパレータは、環状突出帯部及び環状低位部の内側に位置し、環状をなし入れ子状に配置された複数の環状凸部と、この環状凸部同士の間に位置し、環状をなし入れ子状に配置された複数の環状凹部とを有している。
これにより、環状突出帯部及び環状低位部の内側に、厚み方向に高位の環状凸部と厚み方向に低位の環状凹部とが交互に環状に並ぶ。このため、セパレータと負極活物質層との間の電解液は、電極体の中心部から外側に向けて環状凸部を乗り越えて移動しにくい。このため、セパレータと負極活物質層との間の電解液が電極体の周縁から外側へ移動するのを、より適切に防止することができる。加えて、セパレータと負極活物質層との間の電解液の塩濃度分布が、電極体の中心部から外側に向けて偏るのをも防止することもできる。 In this secondary battery, the separator is located inside the annular projecting belt portion and the annular lower portion, and is located between the annular projections and a plurality of annular projections arranged in a nested manner. And a plurality of annular recesses arranged in a nested manner.
As a result, inside the annular projecting band portion and the annular low level portion, a high-order annular convex portion in the thickness direction and a low-order annular concave portion in the thickness direction are alternately arranged in an annular shape. For this reason, the electrolytic solution between the separator and the negative electrode active material layer is difficult to move over the annular convex portion from the center portion of the electrode body toward the outside. For this reason, it can prevent more appropriately that the electrolyte solution between a separator and a negative electrode active material layer moves outside from the periphery of an electrode body. In addition, it is possible to prevent the salt concentration distribution of the electrolytic solution between the separator and the negative electrode active material layer from being biased toward the outside from the central portion of the electrode body.

また、他の態様は、前述のいずれかに記載の二次電池を複数備え、上記二次電池の前記電池ケースは、それぞれ平板状で互いに平行に配置されて、前記扁平捲回電極体の前記平板部を挟む２つの平行壁部を有し、複数の上記二次電池を、上記電池ケースの上記平行壁部に直交する積層方向に積層し、上記扁平捲回電極体の上記平板部を前記厚み方向に圧縮してなる組電池である。   Another aspect includes a plurality of the secondary batteries according to any one of the above, wherein the battery cases of the secondary batteries are each flat and arranged in parallel to each other, and the flat wound electrode body includes the battery case. Two parallel wall portions sandwiching a flat plate portion, a plurality of the secondary batteries are stacked in a stacking direction orthogonal to the parallel wall portion of the battery case, and the flat plate portion of the flat wound electrode body is It is an assembled battery formed by compressing in the thickness direction.

この組電池は、前述の扁平捲回電極体を備える複数の二次電池を積層方向に積層し、扁平捲回電極体の平板部を厚み方向に圧縮しているので、それぞれの二次電池でセパレータと負極活物質層との間の電解液が電極体の外部へと移動することを防止して、電池特性の低下を抑制した組電池となる。   In this assembled battery, a plurality of secondary batteries including the above-described flat wound electrode bodies are stacked in the stacking direction, and the flat plate portion of the flat wound electrode body is compressed in the thickness direction. It is possible to prevent the electrolytic solution between the separator and the negative electrode active material layer from moving to the outside of the electrode body, and to obtain an assembled battery in which deterioration of battery characteristics is suppressed.

また、他の態様は、前述のいずれかに記載の二次電池を複数備え、上記二次電池の前記電池ケースは、それぞれ平板状で互いに平行に配置されて、前記積層型電極体を前記厚み方向に挟む２つの平行壁部を有し、複数の上記二次電池を、上記電池ケースの上記平行壁部に直交する積層方向に積層し、上記積層型電極体を上記厚み方向に圧縮してなる組電池である。   Another aspect includes a plurality of the secondary batteries according to any one of the above, wherein the battery cases of the secondary battery are each flat and arranged in parallel to each other, and the stacked electrode body is formed with the thickness. A plurality of secondary batteries stacked in a stacking direction orthogonal to the parallel wall of the battery case, and the stacked electrode body compressed in the thickness direction. It is an assembled battery.

この組電池は、前述の積層型電極体を備える複数の二次電池を積層方向に積層し、積層型電極体を厚み方向に圧縮しているので、それぞれの二次電池でセパレータと負極活物質層との間の電解液が電極体の外部へと移動することを防止して、電池特性の低下を抑制した組電池となる。
さらに、他の態様は、正極活物質層及び負極活物質層並びに上記正極活物質層と上記負極活物質層との間に介在するセパレータを有する電極体と、上記電極体内に含浸された電解液と、上記電極体及び上記電解液を収容する電池ケースと、を備える二次電池であって、上記セパレータは、多孔質樹脂からなる板状のセパレータ本体と、このセパレータ本体の主面のうち上記負極活物質層側の面上の少なくとも一部に形成され、絶縁性無機多孔質材からなる多孔質層とを有し、上記正極活物質層と上記負極活物質層とが当該セパレータを介して厚み方向に互いに重なる作用域内に、上記作用域の周縁の少なくとも一部に沿いかつ重なって延びる帯状で、上記厚み方向のうち上記負極活物質層に向かう負極側に突出し、少なくとも上記厚み方向負極側の一部は上記多孔質層からなる突出帯部、及び、上記突出帯部よりも上記厚み方向負極側に低位で、上記突出帯部に沿って上記作用域の内側に隣在する低位部を有し、前記電極体は、前記セパレータを介して前記正極活物質層と前記負極活物質層とが互いに平行に前記厚み方向に複数積層された積層型電極体であり、上記セパレータは、前記突出帯部であり、前記作用域の周縁に沿いかつ重なる環状の環状突出帯部と、前記低位部であり、上記環状突出帯部に沿って上記作用域の内側に隣在する環状低位部とを有する二次電池である。
この二次電池においては、突出帯部は、少なくともその厚み方向負極側の一部が多孔質層からなる。具体的には、セパレータ本体の表面に多孔質層を形成し、多孔質層の厚い部位を突出帯部とする一方、多孔質層の薄い部位を低位部とするものが挙げられる。また、多孔質層を設けた部位を突出帯部とし、多孔質層を設けない部位を低位部とすることもできる。
また、上述の二次電池であって、前記セパレータは、前記作用域のうち前記環状突出帯部及び前記環状低位部の内側に位置し、前記厚み方向負極側に突出し、少なくとも上記厚み方向負極側の一部は前記多孔質層からなり、環状をなし入れ子状に配置された複数の環状凸部と、上記環状凸部同士の間に位置し、この環状凸部よりも上記厚み方向負極側に低位で、環状をなし入れ子状に配置された複数の環状凹部とを有する二次電池とすると良い。
さらに前二項の二次電池を複数備え、上記二次電池の前記電池ケースは、それぞれ平板状で互いに平行に配置されて、前記積層型電極体を前記厚み方向に挟む２つの平行壁部を有し、複数の上記二次電池を、上記電池ケースの上記平行壁部に直交する積層方向に積層し、上記積層型電極体を上記厚み方向に圧縮してなる組電池とすると良い。 In this assembled battery, a plurality of secondary batteries including the above-described stacked electrode body are stacked in the stacking direction, and the stacked electrode body is compressed in the thickness direction. It is possible to prevent the electrolyte solution between the layers from moving to the outside of the electrode body, and to obtain an assembled battery in which deterioration of battery characteristics is suppressed.
Furthermore, the other aspect includes a positive electrode active material layer, a negative electrode active material layer, an electrode body having a separator interposed between the positive electrode active material layer and the negative electrode active material layer, and an electrolytic solution impregnated in the electrode body And a battery case containing the electrode body and the electrolyte solution, wherein the separator is a plate-like separator body made of a porous resin, and the main surface of the separator body is the above-mentioned A porous layer made of an insulating inorganic porous material, the positive electrode active material layer and the negative electrode active material layer being interposed via the separator. A band extending along and overlapping at least a part of the peripheral edge of the working area in the working area overlapping with each other in the thickness direction, protruding toward the negative electrode side toward the negative electrode active material layer in the thickness direction, and at least the thickness direction negative A part of the side is a protruding band part made of the porous layer, and a lower level part that is lower in the thickness direction negative electrode side than the protruding band part and is adjacent to the inside of the working area along the protruding band part The electrode body is a stacked electrode body in which a plurality of the positive electrode active material layers and the negative electrode active material layers are stacked in parallel in the thickness direction with the separator interposed therebetween. A ring-shaped annular projecting band portion that extends along and overlaps a peripheral edge of the working area; and a low-order section that is adjacent to the inside of the working area along the annular projecting band section; Is a secondary battery.
In the secondary battery, at least a part of the protruding band portion on the negative electrode side in the thickness direction is formed of a porous layer. Specifically, a porous layer is formed on the surface of the separator body, and a thick part of the porous layer is used as a protruding band part, while a thin part of the porous layer is used as a low part. Moreover, the site | part which provided the porous layer can be made into a protrusion belt | band | zone part, and the site | part which does not provide a porous layer can also be made into a low-order part.
Further, in the above-described secondary battery, the separator is located inside the annular projecting band portion and the annular lower portion in the working area, projects toward the thickness direction negative electrode side, and at least the thickness direction negative electrode side. Is formed between the plurality of annular projections that are annular and arranged in a nested manner, and are located between the annular projections, and closer to the negative electrode side in the thickness direction than the annular projections. A secondary battery having a plurality of annular recesses arranged in a nested manner at a low level is preferable.
The battery case of the secondary battery further includes a plurality of secondary batteries of the preceding two paragraphs, each of which is flat and arranged in parallel to each other, and includes two parallel wall portions sandwiching the stacked electrode body in the thickness direction. It is preferable that a plurality of the secondary batteries are stacked in a stacking direction orthogonal to the parallel wall portion of the battery case, and the stacked electrode body is compressed in the thickness direction.

実施形態１に係るリチウムイオン二次電池の斜視図である。1 is a perspective view of a lithium ion secondary battery according to Embodiment 1. FIG. 実施形態１に係る電池の縦断面図である。1 is a longitudinal sectional view of a battery according to Embodiment 1. FIG. 実施形態１，２に係り、正極板、負極板及び２枚のセパレータの互いの重なりの状態を示す説明図である。It is explanatory drawing which concerns on Embodiment 1, 2, and shows the state of a mutual overlap of a positive electrode plate, a negative electrode plate, and two separators. 実施形態１，２に係る電極体の拡大断面図である。It is an expanded sectional view of the electrode body concerning Embodiments 1 and 2. 実施形態１，２に係るセパレータの平面図である。It is a top view of the separator which concerns on Embodiment 1,2. 変形形態１に係るセパレータの平面図である。It is a top view of the separator which concerns on the modification 1. FIG. 変形形態２に係るセパレータの平面図である。It is a top view of the separator which concerns on the modification 2. FIG. 実施形態２に係るリチウムイオン二次電池の縦断面図である。4 is a longitudinal sectional view of a lithium ion secondary battery according to Embodiment 2. FIG. 実施形態３に係るリチウムイオン二次電池の斜視図である。6 is a perspective view of a lithium ion secondary battery according to Embodiment 3. FIG. 実施形態３に係る電極体の拡大断面図である。6 is an enlarged cross-sectional view of an electrode body according to Embodiment 3. FIG. 実施形態３に係るセパレータの平面図である。6 is a plan view of a separator according to Embodiment 3. FIG. 実施形態４及び変形形態３に係る組電池の説明図である。It is explanatory drawing of the assembled battery which concerns on Embodiment 4 and the modification 3. FIG.

（実施形態１）
以下、本発明の第１の実施の形態を、図面を参照しつつ説明する。図１に、本実施形態１に係るリチウムイオン二次電池１（以下、単に電池１とも言う）を示す。電池１は、扁平捲回電極体２０及び非水系の電解液３０を、矩形板状のケース蓋１１及び有底矩形箱状のケース本体１２からなる電池ケース１０内に収容した角型電池である。電池ケース１０のケース蓋１１には、後述する正極外部端子部４１及び負極外部端子部４２が固設されている。 (Embodiment 1)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a lithium ion secondary battery 1 (hereinafter also simply referred to as battery 1) according to the first embodiment. The battery 1 is a rectangular battery in which a flat wound electrode body 20 and a non-aqueous electrolyte 30 are accommodated in a battery case 10 including a rectangular plate-like case lid 11 and a bottomed rectangular box-like case body 12. . A positive electrode external terminal portion 41 and a negative electrode external terminal portion 42 to be described later are fixed to the case lid 11 of the battery case 10.

扁平捲回電極体２０（以下、単に電極体２０とも言う）は、いずれも帯状の正極板２１と負極板２２とを、同じく帯状の２枚のセパレータ２３，２４を介して互いに重ねて軸線ＡＸの周りに捲回し、扁平状に圧縮したものである。この電極体２０は、絶縁フィルムを袋状に形成した絶縁フィルム包囲体（図示しない）内に収容された上で、横倒しにした状態で電池ケース１０内に収容されている。なお、電池ケース１０のケース本体１２は、それぞれ平板状で互いに平行に配置された２つの平行壁部１２Ａ，１２Ｂを有し、この平行壁部１２Ａ，１２Ｂは、図２の断面図に示すように、電極体２０のうち、正極板２１と負極板２２とが平板状に重なる平板部ＨＢを挟んでいる。   The flat wound electrode body 20 (hereinafter also simply referred to as the electrode body 20) has an axis line AX in which a strip-like positive electrode plate 21 and a negative electrode plate 22 are overlapped with each other via two strip-like separators 23 and 24. Is wound around and compressed into a flat shape. The electrode body 20 is accommodated in an insulating film enclosure (not shown) in which an insulating film is formed in a bag shape, and is accommodated in the battery case 10 in a laid state. The case body 12 of the battery case 10 has two parallel wall portions 12A and 12B which are flat and arranged in parallel with each other, and the parallel wall portions 12A and 12B are as shown in the sectional view of FIG. Further, in the electrode body 20, a flat plate portion HB in which the positive electrode plate 21 and the negative electrode plate 22 overlap in a flat plate shape is sandwiched.

正極板２１は、芯材として、帯状のアルミニウム箔からなる正極集電箔２１ｓを有し、この正極集電箔２１ｓの両面には、リチウム複合酸化物からなる正極活物質、導電剤及び結着剤を含む正極活物質層２１ｋが帯状に設けられている。
図３に示すように、正極集電箔２１ｓの幅方向の一方辺は、その表裏面が露出して正極活物質層２１ｋが存在しない正極集電部２１ｍとなっている。 The positive electrode plate 21 has, as a core material, a positive electrode current collector foil 21s made of a strip-like aluminum foil. On both surfaces of the positive electrode current collector foil 21s, a positive electrode active material made of a lithium composite oxide, a conductive agent, and a binder A positive electrode active material layer 21k containing an agent is provided in a strip shape.
As shown in FIG. 3, one side of the positive electrode current collector foil 21 s in the width direction is a positive electrode current collector 21 m where the front and back surfaces are exposed and the positive electrode active material layer 21 k does not exist.

負極板２２は、芯材として、帯状の銅箔からなる負極集電箔２２ｓを有し、この負極集電箔２２ｓの両面には、負極活物質である黒鉛、結着剤及び増粘剤を含む負極活物質層２２ｋが帯状に設けられている。
さらに、負極集電箔２２ｓの幅方向の一方辺は、その表裏面が露出して負極活物質層２２ｋが存在しない負極集電部２２ｍとなっている（図３参照）。
なお、負極板２２の負極活物質層２２ｋの幅は、正極板２１の正極活物質層２１ｋの幅よりも、やや幅広とされている。 The negative electrode plate 22 has a negative electrode current collector foil 22s made of a strip-shaped copper foil as a core material, and graphite, a binder, and a thickener as a negative electrode active material are formed on both surfaces of the negative electrode current collector foil 22s. The negative electrode active material layer 22k is provided in a strip shape.
Furthermore, one side in the width direction of the negative electrode current collector foil 22s is a negative electrode current collector 22m in which the front and back surfaces are exposed and the negative electrode active material layer 22k does not exist (see FIG. 3).
Note that the width of the negative electrode active material layer 22k of the negative electrode plate 22 is slightly wider than the width of the positive electrode active material layer 21k of the positive electrode plate 21.

２枚のセパレータ２３，２４は、負極板２２の負極活物質層２２ｋの幅よりもさらに幅広な帯状をなしており（図３参照）、その主要部をなすセパレータ本体２３Ｍ，２４Ｍは、多孔質のポリプロピレン（ＰＰ）からなる板状の多孔質膜である。
なお、セパレータ２３は、図４に示すように、セパレータ本体２３Ｍの２つの主面２３ＭＡ，２３ＭＢのうち、負極板２２の負極活物質層２２ｋ側を向く一方の面２３ＭＢ上に、アルミナ粒子を含む絶縁性多孔質材からなる多孔質層２３ＢＳが形成されている。
また、セパレータ２４も同様に、セパレータ本体２４Ｍの２つの主面２４ＭＡ，２４ＭＢのうち、負極板２２の負極活物質層２２ｋ側を向く一方の面２４ＭＡ上に、アルミナ粒子を含む絶縁性多孔質材からなる多孔質層２４ＡＳが形成されている。 The two separators 23 and 24 have a strip shape wider than the width of the negative electrode active material layer 22k of the negative electrode plate 22 (see FIG. 3), and the separator main bodies 23M and 24M constituting the main parts are porous. It is a plate-like porous film made of polypropylene (PP).
As shown in FIG. 4, the separator 23 includes alumina particles on one surface 23MB of the two main surfaces 23MA and 23MB of the separator main body 23M facing the negative electrode active material layer 22k side of the negative electrode plate 22. A porous layer 23BS made of an insulating porous material is formed.
Similarly, the separator 24 is an insulating porous material containing alumina particles on one surface 24MA of the two main surfaces 24MA and 24MB of the separator body 24M facing the negative electrode active material layer 22k side. A porous layer 24AS made of is formed.

そして、互いに重ねられた正極板２１、負極板２２及びセパレータ２３，２４を、図２に示すように、軸線ＡＸの周りに捲回し、扁平状に圧縮して、平板部ＨＢを有する扁平捲回電極体２０を得る。
なお、捲回された正極板２１の正極集電部２１ｍは、クランク状に屈曲した正極集電部材５１に溶接されており、この正極集電部材５１の先端部分である正極外部端子部４１は、電池ケース１０のケース蓋１１を貫通して外部に突出している。また、捲回された負極板２２の負極集電部２２ｍは、同様に、クランク状に屈曲した負極集電部材５２に溶接されており、この負極集電部材５２の先端部分である負極外部端子部４２は、電池ケース１０のケース蓋１１を貫通して外部に突出している。 Then, the positive electrode plate 21, the negative electrode plate 22, and the separators 23 and 24, which are stacked on each other, are wound around an axis AX and compressed into a flat shape, as shown in FIG. An electrode body 20 is obtained.
Note that the positive electrode current collector 21m of the wound positive electrode plate 21 is welded to a positive electrode current collector 51 bent in a crank shape, and a positive electrode external terminal portion 41 that is a tip portion of the positive electrode current collector 51 is The battery case 10 protrudes outside through the case lid 11. Similarly, the negative electrode current collector 22m of the wound negative electrode plate 22 is welded to a negative electrode current collector member 52 bent in a crank shape, and a negative electrode external terminal which is a tip portion of the negative electrode current collector member 52 The part 42 penetrates the case lid 11 of the battery case 10 and protrudes to the outside.

図４は、扁平捲回電極体２０の平板部ＨＢの断面の拡大図である。図４中の左右方向が正極板２１、負極板２２及びセパレータ２３，２４の幅方向ＨＷを示し、図４中の上下方向がこれらの厚み方向ＨＴを示す。なお、幅方向ＨＷは、電極体２０の軸線ＡＸに沿う軸線方向ＨＪと同一方向となる。
ここで、電極体２０が電池ケース１０に収容された状態において、正極板２１の正極活物質層２１ｋと負極板２２の負極活物質層２２ｋとがセパレータ２３，２４を介して厚み方向ＨＴに互いに重なる領域を作用域ＥＡとする。 FIG. 4 is an enlarged view of a cross section of the flat plate portion HB of the flat wound electrode body 20. 4 indicates the width direction HW of the positive electrode plate 21, the negative electrode plate 22, and the separators 23 and 24, and the vertical direction in FIG. 4 indicates the thickness direction HT. The width direction HW is the same direction as the axial direction HJ along the axis AX of the electrode body 20.
Here, in a state where the electrode body 20 is accommodated in the battery case 10, the positive electrode active material layer 21 k of the positive electrode plate 21 and the negative electrode active material layer 22 k of the negative electrode plate 22 are mutually connected in the thickness direction HT via the separators 23 and 24. The overlapping area is defined as an action area EA.

図５は、展開したセパレータ２３を多孔質層２３ＢＳの側から見た図である。この図５中、破線で示す枠内の領域が作用域ＥＡとなる。また、セパレータ２４も同じである。
図４及び図５に示すように、セパレータ２３は、その厚み方向ＨＴのうち、負極活物質層２２ｋに向かう負極側ＧＭ１（図４中上向き）に突出し、かつ、作用域ＥＡの軸線方向ＨＪ一方側ＧＨ１の周縁ＥＧ１及び他方側ＧＨ２の周縁ＥＧ２に沿って、それぞれセパレータ２３の長手方向ＨＮの全体にわたって延びる帯状の一方側凸部２３Ｔ１及び他方側凸部２３Ｔ２を有する。
また、一方側凸部２３Ｔ１に沿う作用域ＥＡの内側には、一方側凸部２３Ｔ１よりも厚み方向ＨＴ負極側ＧＭ１に低位で（つまり、負極板２２から離れており）、長手方向ＨＮの全体にわたって延びる一方側凹部２３Ｏ１が隣在しており、他方側凸部２３Ｔ２に沿う作用域ＥＡの内側には、他方側凸部２３Ｔ２よりも厚み方向ＨＴ負極側ＧＭ１に低位で、長手方向ＨＮの全体にわたって延びる他方側凹部２３Ｏ２が隣在している。 FIG. 5 is a view of the developed separator 23 as seen from the porous layer 23BS side. In FIG. 5, the area within the frame indicated by the broken line is the action area EA. The separator 24 is the same.
As shown in FIGS. 4 and 5, the separator 23 projects to the negative electrode side GM1 (upward in FIG. 4) toward the negative electrode active material layer 22k in the thickness direction HT, and the axial direction HJ of the working area EA Along the peripheral edge EG1 of the side GH1 and the peripheral edge EG2 of the other side GH2, there are a belt-like one-side convex portion 23T1 and the other-side convex portion 23T2 respectively extending over the entire length direction HN of the separator 23.
Further, on the inner side of the working area EA along the one side convex portion 23T1, the entire length direction HN is lower than the one side convex portion 23T1 in the thickness direction HT negative electrode side GM1 (that is, away from the negative electrode plate 22). One side concave portion 23O1 extending over the other side is adjacent, and the inside of the working area EA along the other side convex portion 23T2 is lower in the thickness direction HT negative electrode side GM1 than the other side convex portion 23T2, and the entire longitudinal direction HN The other side recess 23O2 extending over is adjacent.

さらに、一方側凹部２３Ｏ１と他方側凹部２３Ｏ２との間には、厚み方向ＨＴ負極側ＧＭ１に突出し、長手方向ＨＮの全体にわたって延びる帯状の複数の凸部２３Ｔ３を有し、この凸部２３Ｔ３同士の間には、凸部２３Ｔ３よりも厚み方向ＨＴ負極側ＧＭ１に低位で、長手方向ＨＮの全体にわたって延びる帯状の複数の凹部２３Ｏ３を有する。   Further, between the one side recess 23O1 and the other side recess 23O2, there are a plurality of belt-like projections 23T3 protruding in the thickness direction HT negative electrode side GM1 and extending over the entire length direction HN. There are a plurality of strip-shaped recesses 23O3 extending in the longitudinal direction HN at a lower position in the thickness direction HT negative electrode side GM1 than the protrusions 23T3.

また、セパレータ２４も、セパレータ２３と同様に、その厚み方向ＨＴのうち、負極活物質層２２ｋに向かう負極側ＧＭ２（図４中下向き）に突出し、かつ、作用域ＥＡの軸線方向ＨＪ一方側ＧＨ１の周縁ＥＧ１及び他方側ＧＨ２の周縁ＥＧ２に沿って、それぞれセパレータ２４の長手方向ＨＮの全体にわたって延びる帯状の一方側凸部２４Ｔ１及び他方側凸部２４Ｔ２を有する。
また、一方側凸部２４Ｔ１に沿う作用域ＥＡの内側には、一方側凸部２４Ｔ１よりも厚み方向ＨＴ負極側ＧＭ２に低位で、長手方向ＨＮの全体にわたって延びる一方側凹部２４Ｏ１が隣在しており、他方側凸部２４Ｔ２に沿う作用域ＥＡの内側には、他方側凸部２４Ｔ２よりも厚み方向ＨＴ負極側ＧＭ２に低位で、長手方向ＨＮの全体にわたって延びる他方側凹部２４Ｏ２が隣在している。 Similarly to the separator 23, the separator 24 protrudes to the negative electrode side GM2 (downward in FIG. 4) toward the negative electrode active material layer 22k in the thickness direction HT, and the axial direction HJ one side GH1 of the working area EA. A strip-like one-side convex portion 24T1 and the other-side convex portion 24T2 extending along the entire periphery in the longitudinal direction HN of the separator 24 along the peripheral edge EG1 and the peripheral edge EG2 of the other side GH2, respectively.
Further, on the inner side of the working area EA along the one side convex portion 24T1, there is adjacent one side concave portion 24O1 extending in the longitudinal direction HN, which is lower in the thickness direction HT negative electrode side GM2 than the one side convex portion 24T1. The other side concave portion 24O2 extending along the entire length direction HN is adjacent to the inner side of the working area EA along the other side convex portion 24T2 and lower than the other side convex portion 24T2 in the thickness direction HT negative electrode side GM2. Yes.

さらに、一方側凹部２４Ｏ１と他方側凹部２４Ｏ２との間には、厚み方向ＨＴ負極側ＧＭ２に突出し、長手方向ＨＮの全体にわたって延びる帯状の複数の凸部２４Ｔ３を有し、この凸部２４Ｔ３同士の間には、凸部２４Ｔ３よりも厚み方向ＨＴ負極側ＧＭ２に低位で、長手方向ＨＮの全体にわたって延びる帯状の複数の凹部２４Ｏ３を有する。   Furthermore, between the one side concave portion 24O1 and the other side concave portion 24O2, there are a plurality of belt-like convex portions 24T3 projecting in the thickness direction HT negative electrode side GM2 and extending over the entire longitudinal direction HN. There are a plurality of strip-shaped concave portions 24O3 extending in the longitudinal direction HN at a lower position in the thickness direction HT negative electrode side GM2 than the convex portions 24T3.

ここで、一方側凸部２３Ｔ１，２４Ｔ１、他方側凸部２４Ｔ１，２４Ｔ２及び凸部２３Ｔ３，２４Ｔ３は、いずれもセパレータ本体２３Ｍ，２４Ｍの負極活物質層２２ｋ側の面２３ＭＢ，２４ＭＡ上に設けた多孔質層２３ＢＳ，２４ＡＳからなる。また、一方側凹部２３Ｏ１，２４Ｏ１、他方側凹部２３Ｏ２，２４Ｏ２及び凹部２３Ｏ３，２４Ｏ３は、いずれも多孔質層２３ＢＳ，２４ＡＳを設けない部位である。   Here, the one side convex portions 23T1 and 24T1, the other side convex portions 24T1 and 24T2, and the convex portions 23T3 and 24T3 are all porous on the surfaces 23MB and 24MA on the negative electrode active material layer 22k side of the separator bodies 23M and 24M. It consists of a quality layer 23BS, 24AS. The one-side recesses 23O1 and 24O1, the other-side recesses 23O2 and 24O2, and the recesses 23O3 and 24O3 are all portions where the porous layers 23BS and 24AS are not provided.

このように、本実施形態１に係る電池１では、セパレータ２３，２４は、作用域ＥＡ内に、この作用域ＥＡの軸線方向ＨＪの周縁ＥＧ１，ＥＧ２に沿って長手方向ＨＮに延びる帯状で、厚み方向ＨＴ負極側ＧＭ１，ＧＭ２に突出する一方側凸部２３Ｔ１，２４Ｔ１及び他方側凸部２３Ｔ２，２４Ｔ２を有している。また、厚み方向ＨＴ負極側ＧＭ１，ＧＭ２に低位で、一方側凸部２３Ｔ１，２４Ｔ１及び他方側凸部２３Ｔ２，２４Ｔ２に沿って作用域ＥＡの内側に隣在する一方側凹部２３Ｏ１，２４Ｏ１及び他方側凹部２３Ｏ２，２４Ｏ２を有している。   Thus, in the battery 1 according to the first embodiment, the separators 23 and 24 are in the band shape extending in the longitudinal direction HN along the peripheral edges EG1 and EG2 in the axial direction HJ of the working area EA in the working area EA. Thickness direction HT It has one side convex part 23T1, 24T1 and the other side convex part 23T2, 24T2 which protrude to GM negative electrode side GM1, GM2. Also, the one-side recesses 23O1, 24O1 and the other side that are lower in the thickness direction HT negative electrode side GM1, GM2 and are adjacent to the inside of the working area EA along the one-side protrusions 23T1, 24T1 and the other-side protrusions 23T2, 24T2. Recesses 23O2 and 24O2 are provided.

このため、電極体２０が膨張、収縮した場合でも、作用域ＥＡ内でかつセパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０は、作用域ＥＡの軸線方向ＨＪの周縁ＥＧ１，ＥＧ２において、厚み方向ＨＴに高位で負極活物質層２２ｋに当接あるいは近接する一方側凸部２３Ｔ１，２４Ｔ１及び他方側凸部２３Ｔ２，２４Ｔ２を乗り越えて、作用域ＥＡ外へ出にくく、その内側に隣在する厚み方向ＨＴに低位の一方側凹部２３Ｏ１，２４Ｏ１及び他方側凹部２３Ｏ２，２４Ｏ２に留まる。   For this reason, even when the electrode body 20 expands and contracts, the electrolytic solution 30 in the working area EA and between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 is not in the axial direction HJ of the working area EA. In the peripheral edges EG1 and EG2, the first side convex portions 23T1 and 24T1 and the other side convex portions 23T2 and 24T2 that are in contact with or close to the negative electrode active material layer 22k at a high position in the thickness direction HT are overcome and do not easily go out of the working area EA. In the thickness direction HT adjacent to the inner side, the lower one side recesses 23O1, 24O1 and the other side recesses 23O2, 24O2 remain.

これにより、セパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０が、作用域ＥＡから電極体２０の外部へ移動するのが防止される。かくして、充電または放電の繰り返しによる電池特性の低下を抑制した電池１が得られる。   As a result, the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 is prevented from moving from the working area EA to the outside of the electrode body 20. Thus, the battery 1 is obtained in which deterioration of battery characteristics due to repeated charging or discharging is suppressed.

本実施形態１において、一方側凸部２３Ｔ１，２４Ｔ１は本発明の一方側突出帯部に、他方側凸部２３Ｔ２，２４Ｔ２は他方側突出帯部に相当する。
さらに、これら一方側凸部２３Ｔ１，２４Ｔ１及び他方側凸部２３Ｔ２，２４Ｔ２が、突出帯部に相当する。
また、一方側凹部２３Ｏ１，２４Ｏ１は一方側低位部に、他方側凹部２３Ｏ２，２４Ｏ２は他方側低位部に相当する。
さらに、これら一方側凹部２３Ｏ１，２４Ｏ１及び他方側凹部２３Ｏ２，２４Ｏ２が、低位部に相当する。 In the first embodiment, the one side convex portions 23T1 and 24T1 correspond to one side protruding band portions of the present invention, and the other side convex portions 23T2 and 24T2 correspond to the other side protruding band portions.
Furthermore, these one side convex parts 23T1 and 24T1 and the other side convex parts 23T2 and 24T2 correspond to protruding band parts.
Further, the one-side recesses 23O1 and 24O1 correspond to the one-side low-order part, and the other-side recesses 23O2 and 24O2 correspond to the other-side low-order part.
Furthermore, these one side recessed parts 23O1, 24O1 and the other side recessed parts 23O2, 24O2 correspond to a low-order part.

さらに、この電池１では、電極体２０は平板部ＨＢを有する扁平捲回電極体２０であり、セパレータ２３，２４は、作用域ＥＡ内で、少なくとも平板部ＨＢ内に位置する部位に、突出帯部である一方側凸部２３Ｔ１，２４Ｔ１及び他方側凸部２３Ｔ２，２４Ｔ２、低位部である一方側凹部２３Ｏ１，２４Ｏ１及び他方側凹部２３Ｏ２，２４Ｏ２を有している。
これにより、扁平捲回電極体２０の平板部ＨＢから、軸線方向ＨＪ一方側ＧＨ１あるいは他方側ＧＨ２の外部へセパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０が移動するのを防止し、確実に電池特性の低下を抑制することができる。 Furthermore, in this battery 1, the electrode body 20 is a flat wound electrode body 20 having a flat plate portion HB, and the separators 23 and 24 are provided in a projecting band at a position located at least within the flat plate portion HB in the working area EA. The first side convex portions 23T1 and 24T1 and the other side convex portions 23T2 and 24T2 which are the portions, and the one side concave portions 23O1 and 24O1 and the other side concave portions 23O2 and 24O2 which are the lower positions.
As a result, the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 extends from the flat plate portion HB of the flat wound electrode body 20 to the outside of the axial direction HJ one side GH1 or the other side GH2. It is possible to prevent the battery from moving and reliably suppress the deterioration of the battery characteristics.

さらに、この電池１では、一方側凸部２３Ｔ１，２４Ｔ１及び他方側凸部２３Ｔ２，２４Ｔ２が、作用域ＥＡ内のうちの平板部ＨＢ内に位置する部位のみならず、セパレータ２３，２４の長手方向ＨＮ全体に延びている。これにより、セパレータ２３，２４及び扁平捲回電極体２０を容易に形成できる。また、平板部ＨＢの両側の部位においても、軸線方向ＨＪ一方側ＧＨ１あるいは他方側ＧＨ２の外部へセパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０が移動するのを防止できる。   Further, in the battery 1, the one side convex portions 23T1 and 24T1 and the other side convex portions 23T2 and 24T2 are not only located in the flat plate portion HB in the working area EA, but also in the longitudinal direction of the separators 23 and 24. It extends throughout the HN. Thereby, the separators 23 and 24 and the flat wound electrode body 20 can be easily formed. Further, also in the portions on both sides of the flat plate portion HB, the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 moves to the outside of the axial direction HJ one side GH1 or the other side GH2. Can be prevented.

さらに、この電池１では、セパレータ２３，２４は、一方側凹部２３Ｏ１，２４Ｏ１と他方側凹部２３Ｏ２，２４Ｏ２との間に、セパレータ２３，２４の長手方向ＨＮに延びる複数の凸部２３Ｔ３，２４Ｔ３と、この凸部２３Ｔ３，２４Ｔ３同士の間に位置する複数の凹部２３Ｏ３，２４Ｏ３とを有している。
これにより、一方側凹部２３Ｏ１，２４Ｏ１と他方側凹部２３Ｏ２，２４Ｏ２との間に、厚み方向ＨＴに高位の凸部２３Ｔ３，２４Ｔ３と厚み方向ＨＴに低位の凹部２３Ｏ３，２４Ｏ３とが縞状に並んだパターンとなる。 Furthermore, in this battery 1, the separators 23 and 24 are provided with a plurality of protrusions 23T3 and 24T3 extending in the longitudinal direction HN of the separators 23 and 24 between the one-side recesses 23O1 and 24O1 and the other-side recesses 23O2 and 24O2. A plurality of concave portions 23O3 and 24O3 are provided between the convex portions 23T3 and 24T3.
As a result, between the one-side recesses 23O1 and 24O1 and the other-side recesses 23O2 and 24O2, the high-level protrusions 23T3 and 24T3 in the thickness direction HT and the low-level recesses 23O3 and 24O3 are arranged in stripes in the thickness direction HT. It becomes a pattern.

このため、セパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０は、凸部２３Ｔ３，２４Ｔ３を乗り越えて軸線方向ＨＪに移動しにくくなる。
これにより、セパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０が電極体２０の軸線方向ＨＪ一方側ＧＨ１あるいは他方側ＧＨ２の外部へ移動するのを、より適切に防止することができる。加えて、セパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０の塩濃度分布が、軸線方向ＨＪに偏るのを防止することもできる。 For this reason, the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 is difficult to move over the convex portions 23T3 and 24T3 in the axial direction HJ.
Accordingly, it is more appropriate that the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 moves to the outside of the axial direction HJ one side GH1 or the other side GH2 of the electrode body 20. Can be prevented. In addition, it is possible to prevent the salt concentration distribution of the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 from being biased in the axial direction HJ.

本実施形態１において、凸部２３Ｔ３，２４Ｔ３は、本発明の帯状凸部に相当する。また、凹部２３Ｏ３，２４Ｏ３は、帯状凹部に相当する。   In the first embodiment, the convex portions 23T3 and 24T3 correspond to the belt-like convex portions of the present invention. Further, the recesses 23O3 and 24O3 correspond to strip-shaped recesses.

（変形形態１）
また、図６に、上述の実施形態１の第１の変形形態を示す。この図６に示すセパレータ３２３のように、セパレータ３２３の幅方向ＨＷ（軸線方向ＨＪ）の両端縁に沿って長手方向ＨＪに延びる帯状の一方側突出帯部３２３Ｔ１及び他方側突出帯部３２３Ｔ２（突出帯部）を多孔質層により形成し、これらの間は、多孔質層を形成しない厚み方向に低位な部位としても良い。この場合、一方側突出帯部３２３Ｔ１及び他方側突出帯部３２３Ｔ２（突出帯部）に沿って作用域ＥＡの内側に隣在する厚み方向に低位の部位が、一方側低位部３２３Ｏ１及び他方側低位部３２３Ｏ２（低位部）である。 (Modification 1)
FIG. 6 shows a first modification of the first embodiment. Like the separator 323 shown in FIG. 6, the strip-like one-side protruding band portion 323T1 and the other-side protruding band portion 323T2 (protruding) extending in the longitudinal direction HJ along both end edges in the width direction HW (axial direction HJ) of the separator 323. The belt portion may be formed of a porous layer, and the space between them may be a lower portion in the thickness direction where the porous layer is not formed. In this case, the lower portion in the thickness direction adjacent to the inner side of the action area EA along the one side protruding band portion 323T1 and the other side protruding band portion 323T2 (protruding band portion) is the one side lower portion 323O1 and the other side lower position. Part 323O2 (low-order part).

（変形形態２）
また、図７に、実施形態１の第２の変形形態を示す。この図７に示すセパレータ４２３のように、一方側突出帯部４２３Ｔ１及び他方側突出帯部４２３Ｔ２（突出帯部）を形成し、また、その内側を一方側低位部４２３Ｏ１及び他方側低位部４２３Ｏ２（低位部）とするほか、さらにその内側に、多孔質層からなる凸部４２３Ｔ３を格子状などのパターンで設けても良い。 (Modification 2)
FIG. 7 shows a second modification of the first embodiment. As shown in the separator 423 shown in FIG. 7, one side protruding band part 423T1 and the other side protruding band part 423T2 (protruding band part) are formed, and the insides thereof are arranged on one side low level part 423O1 and the other side low level part 423O2 ( In addition, a convex portion 423T3 made of a porous layer may be provided in a pattern such as a lattice.

（実施形態２）
次いで、本発明の第２の実施の形態を、図面を参照しつつ説明する。図８に、本実施形態２に係るリチウムイオン二次電池１０１（以下、単に電池１０１とも言う）を示す。この電池１０１は、円筒状捲回電極体１２０及び非水系の電解液１３０を、円板状のケース蓋１１１及び有底円筒状のケース本体１１２からなる電池ケース１１０内に収容した円筒型電池である。なお、電池ケース１１０のケース蓋１１１は、電気絶縁性樹脂からなる円環状のガスケット１１３を介在させて、ケース本体１１２の開口部１１２Ｈにかしめられており、ケース蓋１１１とケース本体１１２との間は電気的に絶縁されている。そして、ケース蓋１１１の天井面１１１ｂが正極外部端子をなし、ケース本体１１２の底部１１２ｂが負極外部端子をなす。 (Embodiment 2)
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 8 shows a lithium ion secondary battery 101 (hereinafter also simply referred to as battery 101) according to the second embodiment. The battery 101 is a cylindrical battery in which a cylindrical wound electrode body 120 and a non-aqueous electrolyte solution 130 are accommodated in a battery case 110 including a disk-shaped case lid 111 and a bottomed cylindrical case body 112. is there. Note that the case lid 111 of the battery case 110 is caulked to the opening 112H of the case main body 112 with an annular gasket 113 made of an electrically insulating resin interposed between the case lid 111 and the case main body 112. Are electrically insulated. The ceiling surface 111b of the case lid 111 serves as a positive external terminal, and the bottom 112b of the case body 112 serves as a negative external terminal.

円筒状捲回電極体１２０（以下、単に電極体１２０とも言う）は、いずれも帯状の正極板１２１と負極板１２２とを、同じく帯状の２枚のセパレータ１２３，１２４を介して互いに重ねて軸線ＡＸの周りに円筒状に捲回したものである。なお、これら正極板１２１、負極板１２２及びセパレータ１２３，１２４の各々の構成は、実施形態１に係る電池１の扁平捲回電極体２０とほぼ同じである（図３参照）。   A cylindrical wound electrode body 120 (hereinafter also simply referred to as an electrode body 120) has an axial line in which both a belt-like positive electrode plate 121 and a negative electrode plate 122 are overlapped with each other via two belt-like separators 123 and 124. It is wound around the AX in a cylindrical shape. The configuration of each of the positive electrode plate 121, the negative electrode plate 122, and the separators 123 and 124 is substantially the same as that of the flat wound electrode body 20 of the battery 1 according to the first embodiment (see FIG. 3).

正極板１２１は、帯状のアルミニウム箔からなる正極集電箔１２１ｓを有し、この正極集電箔１２１ｓの両面には、正極活物質層１２１ｋが帯状に設けられている。さらに、正極集電箔１２１ｓの幅方向の一方辺は、正極活物質層１２１ｋが存在しない正極集電部１２１ｍとなっている。
負極板１２２は、帯状の銅箔からなる負極集電箔１２２ｓを有し、この負極集電箔１２２ｓの両面には、負極活物質層１２２ｋが帯状に設けられている。さらに、負極集電箔１２２ｓの幅方向の一方辺は、負極活物質層１２２ｋが存在しない負極集電部１２２ｍとなっている。 The positive electrode plate 121 has a positive electrode current collector foil 121s made of a strip-shaped aluminum foil, and a positive electrode active material layer 121k is provided in a band shape on both surfaces of the positive electrode current collector foil 121s. Furthermore, one side in the width direction of the positive electrode current collector foil 121s is a positive electrode current collector 121m in which the positive electrode active material layer 121k does not exist.
The negative electrode plate 122 includes a negative electrode current collector foil 122s made of a strip-shaped copper foil, and a negative electrode active material layer 122k is provided in a band shape on both surfaces of the negative electrode current collector foil 122s. Furthermore, one side in the width direction of the negative electrode current collector foil 122s is a negative electrode current collector 122m in which the negative electrode active material layer 122k does not exist.

２枚のセパレータ１２３，１２４は、それぞれ板状の多孔質膜であるセパレータ本体１２３Ｍ，１２４Ｍを有する。
このうち、セパレータ１２３は、図４に示すように、セパレータ本体１２３Ｍの２つの主面１２３ＭＡ，１２３ＭＢのうち、負極板１２２の負極活物質層１２２ｋ側を向く一方の面１２３ＭＢ上に、絶縁性多孔質材からなる多孔質層２３ＢＳが形成されている。
また、セパレータ１２４も同様に、セパレータ本体１２４Ｍの２つの主面１２４ＭＡ，１２４ＭＢのうち、負極板１２２の負極活物質層１２２ｋ側を向く一方の面１２４ＭＡ上に、絶縁性多孔質材からなる多孔質層１２４ＡＳが形成されている。 The two separators 123 and 124 have separator main bodies 123M and 124M that are plate-like porous films, respectively.
Among these, as shown in FIG. 4, the separator 123 has an insulating porous structure on one surface 123MB facing the negative electrode active material layer 122k side of the negative electrode plate 122 out of the two main surfaces 123MA and 123MB of the separator main body 123M. A porous layer 23BS made of a material is formed.
Similarly, the separator 124 is made of an insulating porous material on one surface 124MA of the negative electrode plate 122 facing the negative electrode active material layer 122k side of the two main surfaces 124MA and 124MB of the separator main body 124M. A layer 124AS is formed.

そして、互いに重ねられた正極板１２１、負極板１２２及びセパレータ１２３，１２４を、図８に示すように、軸線ＡＸの周りに円筒状に捲回して円筒状捲回電極体１２０を得る。
なお、捲回された正極板１２１の正極集電部１２１ｍは、その端縁が金属板からなる正極集電部材１５１に溶接され、さらに、帯状の金属薄板からなる接続部材１５１ｂを介して正極外部端子をなすケース蓋１１１の天井面１１１ｂに電気的に接続している。また、捲回された負極板１２２の負極集電部１２２ｍは、その端縁が金属板からなる負極集電部材１５２に溶接され、この負極集電部材１５２を介して負極外部端子をなすケース本体１１２の底部１１２ｂに電気的に接続している。 Then, the positive electrode plate 121, the negative electrode plate 122, and the separators 123 and 124, which are stacked on each other, are wound around the axis AX in a cylindrical shape to obtain a cylindrical wound electrode body 120, as shown in FIG.
In addition, the positive electrode current collector 121m of the wound positive electrode plate 121 is welded to the positive electrode current collector 151 made of a metal plate at the end, and further connected to the outside of the positive electrode via a connection member 151b made of a strip-shaped metal thin plate. The terminal is electrically connected to the ceiling surface 111b of the case lid 111 that forms a terminal. Further, the negative electrode current collector 122m of the wound negative electrode plate 122 is welded to the negative electrode current collector member 152 made of a metal plate at the edge, and the negative electrode current collector member 152 serves as a negative electrode external terminal. It is electrically connected to the bottom 112b of 112.

本実施形態２の円筒状捲回電極体１２０の断面は、図４に示すように、実施形態１と同様である。図４中の左右方向が正極板１２１、負極板１２２及びセパレータ１２３，１２４の幅方向ＨＷを示し、図４中の上下方向がこれらの厚み方向ＨＴを示す。なお、幅方向ＨＷは、電極体１２０の軸線ＡＸに沿う軸線方向ＨＪと同一方向となる。
ここで、電極体１２０が電池ケース１１０に収容された状態において、正極板１２１の正極活物質層１２１ｋと負極板１２２の負極活物質層１２２ｋとがセパレータ１２３，１２４を介して厚み方向ＨＴに互いに重なる領域を作用域ＥＡとする。 The cross section of the cylindrical wound electrode body 120 of the second embodiment is the same as that of the first embodiment as shown in FIG. 4 indicates the width direction HW of the positive electrode plate 121, the negative electrode plate 122, and the separators 123 and 124, and the vertical direction in FIG. 4 indicates the thickness direction HT. The width direction HW is the same direction as the axial direction HJ along the axis AX of the electrode body 120.
Here, in a state where the electrode body 120 is accommodated in the battery case 110, the positive electrode active material layer 121k of the positive electrode plate 121 and the negative electrode active material layer 122k of the negative electrode plate 122 are mutually connected in the thickness direction HT via the separators 123 and 124. The overlapping area is defined as an action area EA.

また、実施形態１と同様、展開したセパレータ１２３は、実施形態１のセパレータ２３と同様のパターンを有している（図５参照）。図５中、破線で示す枠内の領域が作用域ＥＡとなる。また、セパレータ１２４も同様である。
図４及び図５に示すように、実施形態１と同様、セパレータ１２３は、その厚み方向ＨＴのうち、負極活物質層１２２ｋに向かう負極側ＧＭ１（図４中上向き）に突出し、かつ、作用域ＥＡの軸線方向ＨＪ一方側ＧＨ１の周縁ＥＧ１及び他方側ＧＨ２の周縁ＥＧ２に沿って、それぞれセパレータ１２３の長手方向ＨＮの全体にわたって延びる帯状の一方側凸部１２３Ｔ１及び他方側凸部１２３Ｔ２を有する。
また、一方側凸部１２３Ｔ１に沿う作用域ＥＡの内側には、一方側凸部１２３Ｔ１よりも厚み方向ＨＴ負極側ＧＭ１に低位で、長手方向ＨＮの全体にわたって延びる一方側凹部１２３Ｏ１が隣在しており、他方側凸部１２３Ｔ２に沿う作用域ＥＡの内側には、他方側凸部１２３Ｔ２よりも厚み方向ＨＴ負極側ＧＭ１に低位で、長手方向ＨＮの全体にわたって延びる他方側凹部１２３Ｏ２が隣在している。 Further, as in the first embodiment, the developed separator 123 has the same pattern as the separator 23 in the first embodiment (see FIG. 5). In FIG. 5, the area within the frame indicated by the broken line is the action area EA. The same applies to the separator 124.
As shown in FIGS. 4 and 5, as in the first embodiment, the separator 123 projects to the negative electrode side GM1 (upward in FIG. 4) toward the negative electrode active material layer 122k in the thickness direction HT, and has a working area. Along the peripheral edge EG1 of the EA axial direction HJ one side GH1 and the peripheral edge EG2 of the other side GH2, a strip-like one-side convex portion 123T1 and the other-side convex portion 123T2 respectively extending in the longitudinal direction HN of the separator 123 are provided.
Further, on the inner side of the action area EA along the one-side convex portion 123T1, a one-side concave portion 123O1 that extends lower than the one-side convex portion 123T1 in the thickness direction HT negative electrode side GM1 and extends in the entire longitudinal direction HN is adjacent. Further, on the inner side of the working area EA along the other side convex portion 123T2, there is adjacent to the other side concave portion 123O2 which extends lower in the thickness direction HT negative electrode side GM1 than the other side convex portion 123T2 and extends in the entire longitudinal direction HN. Yes.

さらに、一方側凹部１２３Ｏ１と他方側凹部１２３Ｏ２との間には、厚み方向ＨＴ負極側ＧＭ１に突出し、長手方向ＨＮの全体にわたって延びる帯状の複数の凸部１２３Ｔ３を有し、この凸部１２３Ｔ３同士の間には、凸部１２３Ｔ３よりも厚み方向ＨＴ負極側ＧＭ１に低位で、長手方向ＨＮの全体にわたって延びる帯状の複数の凹部１２３Ｏ３を有する。   Furthermore, between one side recessed part 123O1 and the other side recessed part 123O2, it has several belt-shaped convex part 123T3 which protrudes in the thickness direction HT negative electrode side GM1, and extends over the whole longitudinal direction HN. There are a plurality of strip-shaped recesses 123O3 extending in the longitudinal direction HN at a lower position in the thickness direction HT negative electrode side GM1 than the protrusions 123T3.

また、セパレータ１２４は、その厚み方向ＨＴのうち、負極活物質層１２２ｋに向かう負極側ＧＭ２（図４中下向き）に突出し、かつ、作用域ＥＡの軸線方向ＨＪ一方側ＧＨ１の周縁ＥＧ１及び他方側ＧＨ２の周縁ＥＧ２に沿って、それぞれセパレータ１２４の長手方向ＨＮの全体にわたって延びる帯状の一方側凸部１２４Ｔ１及び他方側凸部１２４Ｔ２を有する。
また、一方側凸部１２４Ｔ１に沿う作用域ＥＡの内側には、一方側凸部２４Ｔ１よりも厚み方向ＨＴ負極側ＧＭ２に低位で、長手方向ＨＮの全体にわたって延びる一方側凹部１２４Ｏ１が隣在しており、他方側凸部１２４Ｔ２に沿う作用域ＥＡの内側には、他方側凸部１２４Ｔ２よりも厚み方向ＨＴ負極側ＧＭ２に低位で、長手方向ＨＮの全体にわたって延びる他方側凹部１２４Ｏ２が隣在している。 The separator 124 protrudes to the negative electrode side GM2 (downward in FIG. 4) toward the negative electrode active material layer 122k in the thickness direction HT, and the peripheral edge EG1 and the other side of the axial direction HJ one side GH1 of the working area EA. Along the peripheral edge EG2 of the GH2, a strip-like one-side convex portion 124T1 and the other-side convex portion 124T2 each extending over the entire longitudinal direction HN of the separator 124 are provided.
Further, on the inner side of the action area EA along the one-side convex portion 124T1, a one-side concave portion 124O1 that extends lower in the thickness direction HT negative electrode side GM2 than the one-side convex portion 24T1 and extends in the entire longitudinal direction HN is adjacent. Further, on the inner side of the action area EA along the other-side convex portion 124T2, the other-side concave portion 124O2 that extends lower than the other-side convex portion 124T2 in the thickness direction HT negative electrode side GM2 and extends in the entire longitudinal direction HN is adjacent. Yes.

さらに、一方側凹部１２４Ｏ１と他方側凹部１２４Ｏ２との間には、厚み方向ＨＴ負極側ＧＭ２に突出し、長手方向ＨＮの全体にわたって延びる帯状の複数の凸部１２４Ｔ３を有し、この凸部１２４Ｔ３同士の間には、凸部１２４Ｔ３よりも厚み方向ＨＴ負極側ＧＭ２に低位で、長手方向ＨＮの全体にわたって延びる帯状の複数の凹部１２４Ｏ３を有する。   Further, between the one-side recess 124O1 and the other-side recess 124O2, there are a plurality of belt-like protrusions 124T3 protruding in the thickness direction HT negative electrode side GM2 and extending over the entire length direction HN. There are a plurality of strip-shaped recesses 124O3 extending in the longitudinal direction HN at a lower position in the thickness direction HT negative electrode side GM2 than the protrusions 124T3.

ここで、一方側凸部１２３Ｔ１，１２４Ｔ１、他方側凸部１２３Ｔ２，１２４Ｔ２及び凸部１２３Ｔ３，１２４Ｔ３は、いずれもセパレータ本体１２３Ｍ，１２４Ｍの負極活物質層１２２ｋ側の面１２３ＭＢ，１２４ＭＡ上に設けた多孔質層１２３ＢＳ，１２４ＡＳからなる。また、一方側凹部１２３Ｏ１，１２４Ｏ１、他方側凹部１２３Ｏ２，１２４Ｏ２及び凹部１２３Ｏ３，１２４Ｏ３は、いずれも多孔質層１２３ＢＳ，１２４ＡＳを設けない部位である。   Here, the one-side convex portions 123T1 and 124T1, the other-side convex portions 123T2 and 124T2, and the convex portions 123T3 and 124T3 are all porous on the surfaces 123MB and 124MA of the separator main bodies 123M and 124M on the negative electrode active material layer 122k side. It consists of a quality layer 123BS, 124AS. The one-side recesses 123O1 and 124O1, the other-side recesses 123O2 and 124O2, and the recesses 123O3 and 124O3 are all portions where the porous layers 123BS and 124AS are not provided.

このように、本実施形態２に係る電池１０１では、実施形態１と同様、セパレータ１２３，１２４は、作用域ＥＡ内に、この作用域ＥＡの軸線方向ＨＪの周縁ＥＧ１，ＥＧ２に沿って長手方向ＨＮに延びる帯状で、厚み方向ＨＴ負極側ＧＭ１，ＧＭ２に突出する一方側凸部１２３Ｔ１，１２４Ｔ１及び他方側凸部１２３Ｔ２，１２４Ｔ２を有している。また、厚み方向ＨＴ負極側ＧＭ１，ＧＭ２に低位で、一方側凸部１２３Ｔ１，１２４Ｔ１及び他方側凸部１２３Ｔ２，１２４Ｔ２に沿って作用域ＥＡの内側に隣在する一方側凹部１２３Ｏ１，１２４Ｏ１及び他方側凹部１２３Ｏ２，１２４Ｏ２を有している。   Thus, in the battery 101 according to the second embodiment, as in the first embodiment, the separators 123 and 124 are disposed in the working area EA along the peripheral edges EG1 and EG2 in the axial direction HJ of the working area EA. It has a belt-like shape extending to HN, and has one-side convex portions 123T1, 124T1 and other-side convex portions 123T2, 124T2 projecting in the thickness direction HT negative electrode side GM1, GM2. Also, the one-side recesses 123O1, 124O1 and the other side that are lower in the thickness direction HT negative electrode side GM1, GM2 and are adjacent to the inside of the working area EA along the one-side protrusions 123T1, 124T1 and the other-side protrusions 123T2, 124T2. Recesses 123O2 and 124O2 are provided.

このため、電極体１２０が膨張、収縮した場合でも、作用域ＥＡ内でかつセパレータ１２３，１２４と負極板１２２の負極活物質層１２２ｋとの間の電解液１３０は、作用域ＥＡの軸線方向ＨＪの周縁ＥＧ１，ＥＧ２において、厚み方向ＨＴに高位で負極活物質層１２２ｋに当接あるいは近接する一方側凸部１２３Ｔ１，１２４Ｔ１及び他方側凸部１２３Ｔ２，１２４Ｔ２を乗り越えて、作用域ＥＡ外へ出にくく、その内側に隣在する厚み方向ＨＴに低位の一方側凹部１２３Ｏ１，１２４Ｏ１及び他方側凹部１２３Ｏ２，１２４Ｏ２に留まる。   For this reason, even when the electrode body 120 expands and contracts, the electrolytic solution 130 in the working area EA and between the separators 123 and 124 and the negative electrode active material layer 122k of the negative electrode plate 122 remains in the axial direction HJ of the working area EA. In the peripheral edges EG1 and EG2, the first side convex portions 123T1 and 124T1 and the other side convex portions 123T2 and 124T2 that are in contact with or close to the negative electrode active material layer 122k at a high position in the thickness direction HT are overcome and do not easily go out of the working area EA. In the thickness direction HT adjacent to the inner side, the lower one side recesses 123O1, 124O1 and the other side recesses 123O2, 124O2 remain.

これにより、セパレータ１２３，１２４と負極板１２２の負極活物質層１２２ｋとの間の電解液１３０が、作用域ＥＡから電極体１２０の外部へ移動するのが防止される。かくして、充電または放電の繰り返しによる電池特性の低下を抑制した電池１０１が得られる。   As a result, the electrolytic solution 130 between the separators 123 and 124 and the negative electrode active material layer 122k of the negative electrode plate 122 is prevented from moving from the working area EA to the outside of the electrode body 120. Thus, the battery 101 is obtained in which deterioration of battery characteristics due to repeated charging or discharging is suppressed.

本実施形態２において、一方側凸部１２３Ｔ１，１２４Ｔ１は本発明の一方側突出帯部に、他方側凸部１２３Ｔ２，１２４Ｔ２は他方側突出帯部に相当する。
さらに、これら一方側凸部１２３Ｔ１，１２４Ｔ１及び他方側凸部１２３Ｔ２，１２４Ｔ２が、突出帯部に相当する。
また、一方側凹部１２３Ｏ１，１２４Ｏ１は一方側低位部に、他方側凹部１２３Ｏ２，１２４Ｏ２は他方側低位部に相当する。
さらに、これら一方側凹部１２３Ｏ１，１２４Ｏ１及び他方側凹部１２３Ｏ２，１２４Ｏ２が、低位部に相当する。 In the second embodiment, the one side convex portions 123T1 and 124T1 correspond to one side protruding band portion of the present invention, and the other side convex portions 123T2 and 124T2 correspond to the other side protruding band portion.
Furthermore, these one side convex parts 123T1 and 124T1 and the other side convex parts 123T2 and 124T2 correspond to protruding band parts.
Further, the one-side recesses 123O1 and 124O1 correspond to one side low-order part, and the other-side recesses 123O2 and 124O2 correspond to the other-side low-order part.
Furthermore, these one side recessed parts 123O1 and 124O1 and the other side recessed parts 123O2 and 124O2 correspond to the low-order parts.

さらに、この電池１０１では、電極体１２０は円筒状捲回電極体１２０であり、セパレータ１２３，１２４は、作用域ＥＡ内に、突出帯部である一方側凸部１２３Ｔ１，１２４Ｔ１及び他方側凸部１２３Ｔ２，１２４Ｔ２、低位部である一方側凹部１２３Ｏ１，１２４Ｏ１及び他方側凹部１２３Ｏ２，１２４Ｏ２を有している。
これにより、円筒状捲回電極体１２０の軸線方向ＨＪ一方側ＧＨ１あるいは他方側ＧＨ２の外側へセパレータ１２３，１２４と負極板１２２の負極活物質層１２２ｋとの間の電解液１３０が移動するのを防止し、電池特性の低下を抑制することができる。 Further, in this battery 101, the electrode body 120 is a cylindrical wound electrode body 120, and the separators 123 and 124 are provided on the one side convex portions 123T1 and 124T1 and the other side convex portions as projecting band portions in the working area EA. 123T2 and 124T2, one side recesses 123O1 and 124O1 which are the lower portions, and the other side recesses 123O2 and 124O2.
Thereby, the electrolytic solution 130 between the separators 123 and 124 and the negative electrode active material layer 122k of the negative electrode plate 122 moves to the outside of the axial direction HJ one side GH1 or the other side GH2 of the cylindrical wound electrode body 120. It is possible to prevent the deterioration of battery characteristics.

さらに、この電池１０１では、セパレータ１２３，１２４は、一方側凹部１２３Ｏ１，１２４Ｏ１と他方側凹部１２３Ｏ２，１２４Ｏ２との間に、セパレータ１２３，１２４の長手方向ＨＮに延びる複数の凸部１２３Ｔ３，１２４Ｔ３と、この凸部１２３Ｔ３，１２４Ｔ３同士の間に位置する複数の凹部１２３Ｏ３，１２４Ｏ３とを有している。
これにより、一方側凹部１２３Ｏ１，１２４Ｏ１と他方側凹部１２３Ｏ２，１２４Ｏ２との間に、厚み方向ＨＴに高位の凸部１２３Ｔ３，１２４Ｔ３と厚み方向ＨＴに低位の凹部１２３Ｏ３，１２４Ｏ３とが縞状に並んだパターンとなる。 Further, in the battery 101, the separators 123 and 124 include a plurality of protrusions 123T3 and 124T3 extending in the longitudinal direction HN of the separators 123 and 124 between the one-side recesses 123O1 and 124O1 and the other-side recesses 123O2 and 124O2, respectively. A plurality of concave portions 123O3 and 124O3 are provided between the convex portions 123T3 and 124T3.
As a result, between the concave portions 123O1 and 124O1 on the one side and the concave portions 123O2 and 124O2 on the other side, the high-level convex portions 123T3 and 124T3 in the thickness direction HT and the low-level concave portions 123O3 and 124O3 in the thickness direction HT are arranged in stripes. It becomes a pattern.

このため、セパレータ１２３，１２４と負極板２２の負極活物質層１２２ｋとの間の電解液１３０は、凸部１２３Ｔ３，１２４Ｔ３を乗り越えて軸線方向ＨＪに移動しにくくなる。
これにより、セパレータ１２３，１２４と負極板１２２の負極活物質層１２２ｋとの間の電解液１３０が、電極体１２０の軸線方向ＨＪ一方側ＧＨ１あるいは他方側ＧＨ２へ移動するのを、より適切に防止することができる。加えて、セパレータ１２３，１２４と負極板１２２の負極活物質層１２２ｋとの間の電解液１３０の塩濃度分布が、軸線方向ＨＪに偏るのを防止することもできる。 For this reason, the electrolytic solution 130 between the separators 123 and 124 and the negative electrode active material layer 122k of the negative electrode plate 22 is difficult to move in the axial direction HJ over the convex portions 123T3 and 124T3.
Accordingly, the electrolyte solution 130 between the separators 123 and 124 and the negative electrode active material layer 122k of the negative electrode plate 122 is more appropriately prevented from moving to the axial direction HJ one side GH1 or the other side GH2 of the electrode body 120. can do. In addition, it is possible to prevent the salt concentration distribution of the electrolytic solution 130 between the separators 123 and 124 and the negative electrode active material layer 122k of the negative electrode plate 122 from being biased in the axial direction HJ.

本実施形態２の電池１０１において、凸部１２３Ｔ３，１２４Ｔ３が、本発明の帯状凸部に相当する。また、凹部１２３Ｏ３，１２４Ｏ３が、帯状凹部に相当する。   In the battery 101 of the second embodiment, the convex portions 123T3 and 124T3 correspond to the belt-like convex portions of the present invention. Further, the recesses 123O3 and 124O3 correspond to strip-shaped recesses.

なお、本実施形態２の電池１０１についても、セパレータ１２３，１２４に代えて、実施形態１と同様に、図６に示すセパレータ３２３、あるいは、図７に示すセパレータ４２３を用いることができる。   In the battery 101 of the second embodiment, instead of the separators 123 and 124, the separator 323 shown in FIG. 6 or the separator 423 shown in FIG. 7 can be used as in the first embodiment.

（実施形態３）
次いで、本発明の第３の実施の形態を、図面を参照しつつ説明する。図９に、本実施形態３に係るリチウムイオン二次電池２０１（以下、単に電池２０１とも言う）を示す。この電池２０１は、積層型電極体２２０及び非水系の電解液２３０を、矩形板状のケース蓋２１１及び有底矩形箱状のケース本体２１２からなる電池ケース２１０内に収容した角型電池である。電池ケース２１０のケース蓋２１１には、後述する正極外部端子部２４１及び負極外部端子部２４２が固設されている。 (Embodiment 3)
Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 9 shows a lithium ion secondary battery 201 (hereinafter also simply referred to as battery 201) according to the third embodiment. The battery 201 is a rectangular battery in which a laminated electrode body 220 and a non-aqueous electrolyte solution 230 are accommodated in a battery case 210 including a rectangular plate-like case lid 211 and a bottomed rectangular box-like case body 212. . A positive electrode external terminal portion 241 and a negative electrode external terminal portion 242 described later are fixed to the case lid 211 of the battery case 210.

積層型電極体２２０（以下、単に電極体２２０とも言う）は、図９，図１０に示すように、いずれも長方形をなす矩形板状の複数の正極板２２１と負極板２２２とを、矩形板状のセパレータ２２３あるいはセパレータ２２４を介して交互にかつ互いに平行に厚み方向ＨＴ（図９中の左下−右上方向、図１０中の上下方向）に重ねたものである。なお、図９における上下方向を高さ方向ＨＨとし、左上−右下方向を幅方向ＨＷとすると、図１０では、左右方向が高さ方向ＨＨに対応し、図１０の紙面に直交する方向が幅方向ＨＷに対応する。
また、電極体２２０は、絶縁フィルムを袋状に形成した絶縁フィルム包囲体（図示しない）内に収容された状態で電池ケース２１０内に収容されている。さらに、電池ケース２１０のケース本体２１２は、それぞれ平板状で互いに平行に配置された２つの平行壁部２１２Ａ，２１２Ｂを有し、この平行壁部２１２Ａ，２１２Ｂは、電極体２２０を厚み方向ＨＴに挟んでいる。 As shown in FIGS. 9 and 10, the laminated electrode body 220 (hereinafter also simply referred to as the electrode body 220) includes a plurality of positive electrode plates 221 and negative electrode plates 222 each having a rectangular shape, which are rectangular plates. Are stacked in the thickness direction HT (lower left-upper right direction in FIG. 9, up-down direction in FIG. 10) alternately and in parallel with each other via the separator 223 or the separator 224. If the vertical direction in FIG. 9 is the height direction HH and the upper left-lower right direction is the width direction HW, in FIG. 10, the left-right direction corresponds to the height direction HH, and the direction orthogonal to the plane of FIG. Corresponds to the width direction HW.
The electrode body 220 is housed in the battery case 210 in a state of being housed in an insulating film enclosure (not shown) in which an insulating film is formed in a bag shape. Furthermore, the case main body 212 of the battery case 210 has two parallel wall portions 212A and 212B that are flat and arranged in parallel to each other. The parallel wall portions 212A and 212B bring the electrode body 220 into the thickness direction HT. It is sandwiched.

正極板２２１は、長方形をなす矩形板状のアルミニウム箔からなる正極集電箔２２１ｓを有し、この正極集電箔２２１ｓの両面には、矩形状に正極活物質層２２１ｋが設けられている。また、正極板２２１の幅方向ＨＷの一方端は、正極集電箔２２１ｓが露出した正極集電部２２１ｍとなっている。複数の正極板２２１の正極集電部２２１ｍは、互いに並列接続されて、クランク状に屈曲した正極集電部材２５１に溶接されており、この正極集電部材２５１の先端部分である正極外部端子部２４１は、電池ケース２１０のケース蓋２１１を貫通して外部に突出している。
負極板２２２は、長方形をなす矩形板状の銅箔からなる負極集電箔２２２ｓを有し、この負極集電箔２２２ｓの両面には、矩形状に負極活物質層２２２ｋが設けられている。また、負極板２２２の幅方向ＨＷの一方端は、負極集電箔２２２ｓが露出した負極集電部２２２ｍとなっている。複数の負極板２２２の負極集電部２２２ｍは、互いに並列接続されて、クランク状に屈曲した負極集電部材２５２に溶接されており、この負極集電部材２５２の先端部分である負極外部端子部２４２は、電池ケース２１０のケース蓋２１１を貫通して外部に突出している。 The positive electrode plate 221 has a positive electrode current collector foil 221s made of a rectangular aluminum foil having a rectangular shape, and a positive electrode active material layer 221k is provided in a rectangular shape on both surfaces of the positive electrode current collector foil 221s. Further, one end of the positive electrode plate 221 in the width direction HW is a positive electrode current collector 221m from which the positive electrode current collector foil 221s is exposed. The positive electrode current collectors 221m of the plurality of positive electrode plates 221 are connected to each other in parallel and welded to a positive electrode current collector 251 bent in a crank shape, and a positive electrode external terminal portion which is a tip portion of the positive electrode current collector 251 Reference numeral 241 protrudes through the case lid 211 of the battery case 210.
The negative electrode plate 222 has a negative electrode current collector foil 222s made of a rectangular copper foil having a rectangular shape, and a negative electrode active material layer 222k is provided in a rectangular shape on both surfaces of the negative electrode current collector foil 222s. Further, one end of the negative electrode plate 222 in the width direction HW is a negative electrode current collector 222m where the negative electrode current collector foil 222s is exposed. The negative electrode current collectors 222m of the plurality of negative electrode plates 222 are connected to each other in parallel and welded to a negative electrode current collector member 252 bent in a crank shape, and a negative electrode external terminal portion that is a tip portion of the negative electrode current collector member 252 Reference numeral 242 projects outside through the case lid 211 of the battery case 210.

セパレータ２２３，２２４は、板状の多孔質膜であるセパレータ本体２２３Ｍ，２２４Ｍを有する。
このうち、セパレータ２２３は、図１０に示すように、セパレータ本体２２３Ｍの２つの主面２２３ＭＡ，２２３ＭＢのうち、負極板２２２の負極活物質層２２２ｋ側を向く一方の面２２３ＭＢ上に、絶縁性多孔質材からなる多孔質層２３ＢＳが形成されている。
また、セパレータ２２４も同様に、セパレータ本体２２４Ｍの２つの主面２２４ＭＡ，２２４ＭＢのうち、負極板２２２の負極活物質層２２２ｋ側を向く一方の面２２４ＭＡ上に、絶縁性多孔質材からなる多孔質層２４ＡＳが形成されている。
ここで、電極体２２０が電池ケース２１０に収容された状態において、正極板２２１の正極活物質層２２１ｋと負極板２２２の負極活物質層２２２ｋとがセパレータ２２３，２２４を介して厚み方向ＨＴに互いに重なる領域を作用域ＥＡとする。 The separators 223 and 224 have separator main bodies 223M and 224M that are plate-like porous films.
Among these, as shown in FIG. 10, the separator 223 has an insulating porous structure on one surface 223MB of the two main surfaces 223MA and 223MB of the separator body 223M facing the negative electrode active material layer 222k side of the negative electrode plate 222. A porous layer 23BS made of a material is formed.
Similarly, the separator 224 is made of an insulating porous material on one surface 224MA of the two main surfaces 224MA and 224MB of the separator body 224M facing the negative electrode active material layer 222k side of the negative electrode plate 222. A layer 24AS is formed.
Here, in a state where the electrode body 220 is accommodated in the battery case 210, the positive electrode active material layer 221k of the positive electrode plate 221 and the negative electrode active material layer 222k of the negative electrode plate 222 are mutually in the thickness direction HT via the separators 223 and 224. The overlapping area is defined as an action area EA.

図１１は、セパレータ２２３を多孔質層２２３ＢＳの側から見た図である。この図１１中、破線で示す枠内の領域が作用域ＥＡとなる。また、セパレータ２２４も同じである。
図１０及び図１１に示すように、セパレータ２２３は、その厚み方向ＨＴ（図１１において紙面に垂直な方向）のうち、負極活物質層２２２ｋに向かう負極側ＧＭ１（図１０中上向き、図１１中、手前側）に突出し、かつ、作用域ＥＡの周縁ＥＧ３に沿って角型の環状をなす外周凸部２２３Ｔ１を有する。
また、外周凸部２２３Ｔ１に沿う作用域ＥＡの内側には、外周凸部２２３Ｔ１よりも厚み方向ＨＴ負極側ＧＭ１に低位で、角型の環状をなす外周凹部２２３Ｏ１が隣在している。 FIG. 11 is a view of the separator 223 as viewed from the porous layer 223BS side. In FIG. 11, a region within a frame indicated by a broken line is an action area EA. The separator 224 is the same.
As shown in FIGS. 10 and 11, the separator 223 has a negative electrode side GM1 (upward in FIG. 10, upward in FIG. 10, in the thickness direction HT (direction perpendicular to the paper surface in FIG. 11)) facing the negative electrode active material layer 222k. The outer peripheral convex part 223T1 which protrudes to the near side and forms a square annular shape along the peripheral edge EG3 of the action area EA.
Further, on the inner side of the action area EA along the outer peripheral convex portion 223T1, an outer peripheral concave portion 223O1 having a square annular shape is adjacent to the outer peripheral convex portion 223T1, which is lower in the thickness direction HT negative electrode side GM1.

さらに、作用域ＥＡのうち、外周凸部２２３Ｔ１及び外周凹部２２３Ｏ１の内側には、厚み方向ＨＴ負極側ＧＭ１に突出し、角型の環状をなして入れ子状に配置された複数の凸部２２３Ｔ３を有する。また、この凸部２２３Ｔ３同士の間には、凸部２２３Ｔ３よりも厚み方向ＨＴ負極側ＧＭ１に低位で、角型の環状をなして入れ子状に配置された複数の凹部２２３Ｏ３を有する。   Further, in the working area EA, inside the outer peripheral convex portion 223T1 and the outer peripheral concave portion 223O1, there are a plurality of convex portions 223T3 protruding in the thickness direction HT negative electrode side GM1 and arranged in a square shape in a nested manner. . Further, between the convex portions 223T3, there are a plurality of concave portions 223O3 arranged in a nested manner in a square ring shape at a lower position in the thickness direction HT negative electrode side GM1 than the convex portion 223T3.

なお、本実施形態３では、外周凸部２２３Ｔ１及び凸部２２３Ｔ３は、いずれもセパレータ本体２２３Ｍの負極活物質層２２２ｋ側の面２２３ＭＢ上に設けた多孔質層２２３ＢＳからなる。また、外周凹部２２３Ｏ１及び凹部２２３Ｏ３は、いずれも多孔質層２２３ＢＳを設けない部位である。   In the third embodiment, the outer peripheral convex portion 223T1 and the convex portion 223T3 are each composed of a porous layer 223BS provided on the surface 223MB of the separator main body 223M on the negative electrode active material layer 222k side. Further, both the outer peripheral recess 223O1 and the recess 223O3 are portions where the porous layer 223BS is not provided.

また、セパレータ２２４も、その厚み方向ＨＴのうち、負極活物質層２２２ｋに向かう負極側ＧＭ２（図１０中下向き）に突出し、かつ、作用域ＥＡの周縁ＥＧ３に沿って角型の環状をなす外周凸部２２４Ｔ１を有する。
また、外周凸部２２４Ｔ１に沿う作用域ＥＡの内側には、外周凸部２２４Ｔ１よりも厚み方向ＨＴ負極側ＧＭ１に低位で、角型の環状をなす外周凹部２２４Ｏ１が隣在している。 The separator 224 also has an outer periphery that protrudes to the negative electrode side GM2 (downward in FIG. 10) toward the negative electrode active material layer 222k in the thickness direction HT and forms a rectangular ring shape along the peripheral edge EG3 of the working area EA. It has a convex part 224T1.
Further, on the inner side of the action area EA along the outer peripheral convex portion 224T1, an outer peripheral concave portion 224O1 having a rectangular shape is adjacent to the outer peripheral convex portion 224T1 at a lower position in the thickness direction HT negative electrode side GM1.

さらに、作用域ＥＡのうち、外周凸部２２４Ｔ１及び外周凹部２２４Ｏ１の内側には、厚み方向ＨＴ負極側ＧＭ１に突出し、角型の環状をなして入れ子状に配置された複数の凸部２２４Ｔ３を有する。また、この凸部２２４Ｔ３同士の間には、凸部２２４Ｔ３よりも厚み方向ＨＴ負極側ＧＭ１に低位で、角型の環状をなして入れ子状に配置された複数の凹部２２４Ｏ３を有する。   Further, in the working area EA, inside the outer peripheral convex portion 224T1 and the outer peripheral concave portion 224O1, there are a plurality of convex portions 224T3 that protrude in the thickness direction HT negative electrode side GM1 and are arranged in a nested manner in a square ring shape. . Further, between the convex portions 224T3, there are a plurality of concave portions 224O3 arranged in a nested manner in a rectangular shape at a lower position than the convex portion 224T3 in the thickness direction HT negative electrode side GM1.

ここで、外周凸部２２４Ｔ１及び凸部２２４Ｔ３は、いずれもセパレータ本体２２４Ｍの負極活物質層２２２ｋ側の面２２４ＭＡ上に設けた多孔質層２２４ＡＳからなる。また、外周凹部２２４Ｏ１及び凹部２２４Ｏ３は、いずれも多孔質層２２４ＡＳを設けない部位である。   Here, each of the outer peripheral convex portion 224T1 and the convex portion 224T3 is composed of a porous layer 224AS provided on the surface 224MA on the negative electrode active material layer 222k side of the separator body 224M. Moreover, both the outer periphery recessed part 224O1 and the recessed part 224O3 are parts in which the porous layer 224AS is not provided.

このように、本実施形態３に係る電池２０１では、セパレータ２２３，２２４は、作用域ＥＡ内に、この作用域ＥＡの周縁ＥＧ３に沿って角型の環状をなし、厚み方向ＨＴ負極側ＧＭ１，ＧＭ２に突出する外周凸部２２３Ｔ１，２２４Ｔ１を有している。また、厚み方向ＨＴ負極側ＧＭ１，ＧＭ２に低位で、外周凸部２２３Ｔ１，２２４Ｔ１に沿って作用域ＥＡの内側に隣在する外周凹部２２３Ｏ１，２２４Ｏ１を有している。   As described above, in the battery 201 according to the third embodiment, the separators 223 and 224 have a square annular shape along the peripheral edge EG3 of the working area EA in the working area EA, and the thickness direction HT negative electrode side GM1, It has the outer peripheral convex part 223T1 and 224T1 which protrude in GM2. Moreover, it has outer peripheral recessed part 223O1,224O1 which is low in thickness direction HT negative electrode side GM1, GM2, and adjoins inner side of action area EA along outer peripheral convex part 223T1,224T1.

このため、電極体２２０が膨張、収縮した場合でも、作用域ＥＡ内でかつセパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０は、作用域ＥＡの周縁ＥＧ３において、厚み方向ＨＴに高位で負極活物質層２２２ｋに当接あるいは近接する外周凸部２２３Ｔ１，２２４Ｔ１を乗り越えて、作用域ＥＡ外へ出にくく、その内側に隣在する厚み方向ＨＴに低位の外周凹部２２３Ｏ１，２２４Ｏ１に留まる。   For this reason, even when the electrode body 220 expands and contracts, the electrolyte solution 230 in the working area EA and between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 is in the peripheral edge EG3 of the working area EA. The outer circumferential concave portion 223T1, 224T1 that is higher in the thickness direction HT and is in contact with or close to the negative electrode active material layer 222k is difficult to go out of the active area EA, and the lower circumferential concave portion adjacent to the inner side in the thickness direction HT. Stays at 223O1, 224O1.

これにより、セパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０が、作用域ＥＡから電極体２２０の外部へ移動するのが防止される。かくして、充電または放電の繰り返しによる電池特性の低下を抑制した電池２０１が得られる。   As a result, the electrolytic solution 230 between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 is prevented from moving from the working area EA to the outside of the electrode body 220. Thus, the battery 201 is obtained in which deterioration of battery characteristics due to repeated charging or discharging is suppressed.

本実施形態３において、外周凸部２２３Ｔ１，２２４Ｔ１が、本発明の環状突出帯部及び突出帯部に相当する。また、外周凹部２２３Ｏ１，２２４Ｏ１が、環状低位部及び低位部に相当する。   In the third embodiment, the outer peripheral convex portions 223T1 and 224T1 correspond to the annular protruding band portion and the protruding band portion of the present invention. Further, the outer peripheral recesses 223O1 and 224O1 correspond to the annular lower portion and the lower portion.

さらに、この電池２０１では、電極体２２０は積層型電極体２２０であり、セパレータ２２３，２２４は、作用域ＥＡ内に、突出帯部である外周凸部２２３Ｔ１、低位部である外周凹部２２３Ｏ１を有している。
これにより、積層型電極体２２０の周縁から外側へセパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０が移動するのを防止し、電池特性の低下を抑制することができる。 Further, in this battery 201, the electrode body 220 is a laminated electrode body 220, and the separators 223 and 224 have an outer peripheral convex portion 223T1 that is a protruding band portion and an outer peripheral concave portion 223O1 that is a lower portion in the working area EA. doing.
As a result, the electrolytic solution 230 between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 is prevented from moving from the peripheral edge of the multilayer electrode body 220 to the outside, and the deterioration of the battery characteristics is suppressed. Can do.

さらに、この電池２０１では、外周凸部２２３Ｔ１，２２４Ｔ１及び外周凹部２２３Ｏ１，２２４Ｏ１の内側に、厚み方向ＨＴに高位の凸部２２３Ｔ３，２２４Ｔ３と厚み方向ＨＴに低位の凹部２２３Ｏ３，２２４Ｏ３とが交互に環状に並ぶ。   Further, in the battery 201, the convex portions 223T3 and 224T3 having higher positions in the thickness direction HT and the concave portions 223O3 and 224O3 having lower positions in the thickness direction HT are alternately arranged inside the outer peripheral convex portions 223T1 and 224T1 and the outer peripheral concave portions 223O1 and 224O1. Lined up.

このため、セパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０は、電極体２２０の中心部から外側に向けて凹部２２３Ｔ３，２２４Ｔ３を乗り越えて移動しにくい。このため、セパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０が電極体２２０の周縁から外側へ移動するのを、より適切に防止することができる。加えて、セパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０の塩濃度分布が、電極体２２０の中心部から外側に向けて偏るのを防止することもできる。   For this reason, the electrolytic solution 230 between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 is difficult to move over the recesses 223T3 and 224T3 from the center of the electrode body 220 toward the outside. For this reason, it is possible to more appropriately prevent the electrolytic solution 230 between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 from moving from the periphery of the electrode body 220 to the outside. In addition, it is possible to prevent the salt concentration distribution of the electrolyte solution 230 between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 from being biased outward from the center of the electrode body 220.

本実施形態３において、凸部２２３Ｔ３，２２４Ｔ３が、本発明の環状凸部に相当する。また、凹部２２３Ｏ３，２２４Ｏ３が、環状凹部に相当する。   In the third embodiment, the convex portions 223T3 and 224T3 correspond to the annular convex portion of the present invention. Further, the recesses 223O3 and 224O3 correspond to an annular recess.

（実施形態４）
次いで、本発明の第４の実施の形態を、図１２を参照しつつ説明する。本実施形態４に係る組電池２は、実施形態１に係る扁平捲回電極体２０を備える複数の電池１を、この電池１の電池ケース１０の平行壁部１２Ａ，１２Ｂに直交する積層方向ＨＡに積層して互いを直列に接続し、２つの押圧部材２Ａ，２Ｂで挟んで、扁平捲回電極体２０の平板部ＨＢを厚み方向ＨＴに圧縮したものである。なお、この組電池２は、各電池１同士を、平行壁部１２Ａ，１２Ｂよりも外形が小さい矩形板状のスペーサＳＰを介在させて積層方向ＨＡに積層し、さらに、これらを２つの押圧部材２Ａ，２Ｂで挟んで積層方向ＨＡに押圧して、金属板からなる締結部材２Ｃ，２Ｄ及び締結ボルトＢＴを用いて締結している。これにより、各電池１の扁平捲回電極体２０の平板部ＨＢが厚み方向ＨＴに圧縮されてなる。 (Embodiment 4)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The assembled battery 2 according to the fourth embodiment includes a plurality of batteries 1 including the flat wound electrode body 20 according to the first embodiment in a stacking direction HA perpendicular to the parallel wall portions 12A and 12B of the battery case 10 of the battery 1. And the flat plate portion HB of the flat wound electrode body 20 is compressed in the thickness direction HT, sandwiched between two pressing members 2A and 2B. In the assembled battery 2, the batteries 1 are stacked in the stacking direction HA with a rectangular plate spacer SP having an outer shape smaller than that of the parallel wall portions 12A and 12B. 2A and 2B are sandwiched, pressed in the stacking direction HA, and fastened using fastening members 2C and 2D made of metal plates and fastening bolts BT. Thereby, the flat plate part HB of the flat wound electrode body 20 of each battery 1 is compressed in the thickness direction HT.

前述したように、電池１は、セパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０が電極体２０の外部へと移動することを防止しており、さらに、電池１を積層方向ＨＡに積層することにより、扁平捲回電極体２０の平板部ＨＢを厚み方向ＨＢに圧縮している。これにより、それぞれの電池１でセパレータ２３，２４と負極板２２の負極活物質層２２ｋとの間の電解液３０が電極体２０の外部へと移動することを適切に防止して、電池特性の低下を抑制した組電池２となる。   As described above, the battery 1 prevents the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 from moving to the outside of the electrode body 20. By laminating 1 in the laminating direction HA, the flat plate portion HB of the flat wound electrode body 20 is compressed in the thickness direction HB. This appropriately prevents the electrolytic solution 30 between the separators 23 and 24 and the negative electrode active material layer 22k of the negative electrode plate 22 from moving outside the electrode body 20 in each battery 1, The assembled battery 2 is suppressed from decreasing.

（変形形態３）
次いで、実施形態４の変形形態を、実施形態４と同じく図１２を参照しつつ説明する。本変形形態３に係る組電池２０２は、実施形態４における電池１に代えて、実施形態３に係る電池２０１を用いたものである。即ち、この電池２０１の電池ケース２１０の平行壁部２１２Ａ，２１２Ｂに直交する積層方向ＨＡに積層して互いを直列に接続し、２つの押圧部材２Ａ，２Ｂで挟んで、電池２０１の積層型電極体２２０を厚み方向ＨＴに圧縮したものである。なお、この組電池２０２も、各電池２０１同士を、平行壁部２１２Ａ，２１２Ｂよりも外形が小さい矩形板状のスペーサＳＰを介在させて積層方向ＨＡに積層し、さらに、これらを２つの押圧部材２Ａ，２Ｂで挟んで積層方向ＨＡに押圧して、金属板からなる締結部材２Ｃ，２Ｄ及び締結ボルトＢＴを用いて締結している。これにより、各電池２０１の積層型電極体２２０が厚み方向ＨＴに圧縮されてなる。 (Modification 3)
Next, a modification of the fourth embodiment will be described with reference to FIG. The assembled battery 202 according to the third modification uses the battery 201 according to the third embodiment instead of the battery 1 according to the fourth embodiment. That is, the stacked electrodes of the battery 201 are stacked in the stacking direction HA orthogonal to the parallel walls 212A and 212B of the battery case 210 of the battery 201 and connected in series, and sandwiched between the two pressing members 2A and 2B. The body 220 is compressed in the thickness direction HT. The assembled battery 202 is also formed by stacking the batteries 201 in the stacking direction HA with a rectangular plate spacer SP having an outer shape smaller than that of the parallel wall portions 212A and 212B. 2A and 2B are sandwiched, pressed in the stacking direction HA, and fastened using fastening members 2C and 2D made of metal plates and fastening bolts BT. Thereby, the laminated electrode body 220 of each battery 201 is compressed in the thickness direction HT.

前述したように、電池２０１は、セパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０が電極体２２０の外部へと移動することを防止しており、さらに、電池１を積層方向ＨＡに積層することにより、積層型電極体２２０を厚み方向ＨＢに圧縮している。これにより、それぞれの電池２０１でセパレータ２２３，２２４と負極板２２２の負極活物質層２２２ｋとの間の電解液２３０が電極体２２０の外部へと移動することを適切に防止して、電池特性の低下を抑制した組電池２０２となる。   As described above, the battery 201 prevents the electrolytic solution 230 between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 from moving to the outside of the electrode body 220. The laminated electrode body 220 is compressed in the thickness direction HB by laminating 1 in the lamination direction HA. Accordingly, it is possible to appropriately prevent the electrolyte solution 230 between the separators 223 and 224 and the negative electrode active material layer 222k of the negative electrode plate 222 from moving outside the electrode body 220 in each battery 201. The assembled battery 202 is suppressed from decreasing.

以上において、本発明を実施形態１〜４及び変形形態１〜３に即して説明したが、本発明は上記実施形態及び変形形態に限定されるものではなく、その要旨を逸脱しない範囲で、適宜変更して適用できることは言うまでもない。   As mentioned above, although this invention was demonstrated according to Embodiment 1-4 and the modification 1-3, this invention is not limited to the said embodiment and modification, In the range which does not deviate from the summary, Needless to say, the present invention can be applied with appropriate changes.

例えば、実施形態１では、セパレータ２３，２４は、セパレータ本体２３Ｍ，２４Ｍの負極活物質層２２ｋ側の面２３ＭＢ，２４ＭＢ上に多孔質層２３ＢＳ，２４ＡＳを設けて、突出帯部である一方側凸部２３Ｔ１，２４Ｔ１及び他方側凸部２３Ｔ２，２４Ｔ２、並びに帯状凸部である凸部２３Ｔ３，２４Ｔ３を形成した。一方、低位部である一方側凹部２３Ｏ１，２４Ｏ１及び他方側凹部２３Ｏ２，２４Ｏ２、並びに帯状凹部である凹部２３Ｏ３，２４Ｏ３は、多孔質層２３ＢＳ，２４ＡＳを設けない部位とした。また、実施形態３では、帯状凸部及び帯状凹部に代えて、環状凸部である凸部２２３Ｔ３，２２４Ｔ３及び環状凹部である凹部２２３Ｏ３，２２４Ｏ３を有するが、これら他の実施形態も同様とした。
しかし、多孔質層を厚くした部位と薄くした部位を設けることにより、多孔質層を厚くした部位で突出帯部及び帯状凸部若しくは環状凸部を形成し、多孔質層を薄くした部位で低位部及び帯状凹部若しくは環状凹部を形成しても良い。 For example, in the first embodiment, the separators 23 and 24 are provided with the porous layers 23BS and 24AS on the surfaces 23MB and 24MB on the negative electrode active material layer 22k side of the separator bodies 23M and 24M, and are convex on one side. The portions 23T1 and 24T1, the other side convex portions 23T2 and 24T2, and the convex portions 23T3 and 24T3 which are belt-like convex portions were formed. On the other hand, the one-side recesses 23O1 and 24O1 and the other-side recesses 23O2 and 24O2 which are the lower portions, and the recesses 23O3 and 24O3 which are band-like recesses are portions where the porous layers 23BS and 24AS are not provided. In the third embodiment, the convex portions 223T3 and 224T3 that are annular convex portions and the concave portions 223O3 and 224O3 that are annular concave portions are provided in place of the belt-like convex portions and the belt-like concave portions, but the other embodiments are also the same.
However, by providing a thickened part and a thinned part of the porous layer, a protruding band and a band-shaped convex part or an annular convex part are formed in the thickened part of the porous layer, and a lower position is formed in the thinned part of the porous layer. You may form a part and a strip-shaped recessed part or an annular recessed part.

また、実施形態３では、アルミニウム箔からなる正極集電箔２２１ｓの両面に正極活物質層２２１ｋを設けた複数の正極板２２１と、銅箔からなる負極集電箔２２２ｓの両面に負極活物質層２２２ｋを設けた複数の負極板２２２とを、セパレータ２２３あるいはセパレータ２２４を介して交互にかつ互いに厚み方向ＨＴに重ねて、積層型電極体２２０を得た。
しかし、積層型電極体としては、１枚の金属板の一方面に正極活物質層を設けて正極面とし、他方面に負極活物質層を設けて負極面とした正極及び負極を有する電極板を、直列接続となるように、セパレータを介して厚み方向に複数枚重ねたものでも良い。 In Embodiment 3, a plurality of positive electrode plates 221 provided with positive electrode active material layers 221k on both surfaces of a positive electrode current collector foil 221s made of aluminum foil, and negative electrode active material layers on both surfaces of a negative electrode current collector foil 222s made of copper foil A plurality of negative electrode plates 222 provided with 222k were alternately stacked on each other in the thickness direction HT via the separators 223 or 224 to obtain a stacked electrode body 220.
However, as a laminated electrode body, an electrode plate having a positive electrode and a negative electrode provided with a positive electrode active material layer provided on one surface of a single metal plate as a positive electrode surface and a negative electrode active material layer provided on the other surface as a negative electrode surface. A plurality of layers may be stacked in the thickness direction via a separator so as to be connected in series.

１，１０１，２０１ リチウムイオン二次電池（二次電池、電池）
１０，１１０，２１０ 電池ケース
１２Ａ，１２Ｂ，２１２Ａ，２１２Ｂ 平行壁部
３０，１３０，２３０ 電解液
２０ 扁平捲回電極体（電極体）
ＡＸ 軸線
ＨＢ 平板部
１２０ 円筒状捲回電極体（電極体）
２２０ 積層型電極体（電極体）
２１，１２１，２２１ 正極板
２２，１２２，２２２ 負極板
２１ｋ，１２１ｋ，２２１ｋ 正極活物質層
２２ｋ，１２２ｋ，２２２ｋ 負極活物質層
２３，２４，１２３，１２４，２２３，２２４，３２３，４２３ セパレータ
２３Ｍ，２４Ｍ，１２３Ｍ，１２４Ｍ，２２３Ｍ，２２４Ｍ セパレータ本体
２３ＭＡ，２３ＭＢ，２４ＭＡ，２４ＭＢ，１２３ＭＡ，１２３ＭＢ，１２４ＭＡ，１２４ＭＢ，２２３ＭＡ，２２３ＭＢ，２２４ＭＡ，２２４ＭＢ （セパレータ本体の）主面
２３ＢＳ，２４ＡＳ，１２３ＢＳ，１２４ＡＳ，２２３ＢＳ，２２４ＡＳ 多孔質層
ＥＡ 作用域
ＨＴ 厚み方向
ＧＭ１，ＧＭ２ 負極側
ＨＪ 軸線方向
ＧＨ１ （軸線方向の）一方側
ＧＨ２ （軸線方向の）他方側
ＥＧ１，ＥＧ２，ＥＧ３ 周縁
ＨＮ 長手方向
２３Ｔ，２４Ｔ，１２３Ｔ，１２４Ｔ 凸部（帯状凸部）
２３Ｏ，２４Ｏ，１２３Ｏ，１２４Ｏ 凹部（帯状凹部）
２３Ｔ１，２４Ｔ１，１２３Ｔ１，１２４Ｔ１，３２３Ｔ１，４２３Ｔ１ 一方側凸部（一方側突出帯部（突出帯部））
２３Ｔ２，２４Ｔ２，１２３Ｔ２，１２４Ｔ２，３２３Ｔ２，４２３Ｔ２ 他方側凸部（他方側突出帯部（突出帯部））
２３Ｏ１，２４Ｏ１，１２３Ｏ１，１２４Ｏ１，３２３Ｏ１，４２３Ｏ１ 一方側凹部（一方側低位部（低位部））
２３Ｏ２，２４Ｏ２，１２３Ｏ２，１２４Ｏ２，３２３Ｏ２，４２３Ｏ２ 他方側凹部（他方側低位部（低位部））
２３Ｔ３，２４Ｔ３，１２３Ｔ３，１２４Ｔ３ 凸部（帯状凸部）
２３Ｏ３，２４Ｏ３，１２３Ｏ３，１２４Ｏ３ 凹部（帯状凹部）
２２３Ｔ１，２２４Ｔ１ 外周凸部（環状突出帯部（突出帯部））
２２３Ｏ１，２２４Ｏ１ 外周凹部（環状低位部（低位部））
２２３Ｔ３，２２４Ｔ３ 凸部（環状凸部）
２２３Ｏ３，２２４Ｏ３ 凹部（環状凹部）
２，２０２ 組電池
ＨＡ 積層方向 1,101,201 Lithium ion secondary battery (secondary battery, battery)
10, 110, 210 Battery case 12A, 12B, 212A, 212B Parallel wall 30, 130, 230 Electrolytic solution 20 Flat wound electrode body (electrode body)
AX axis HB flat plate part 120 cylindrical wound electrode body (electrode body)
220 Stacked electrode body (electrode body)
21, 121, 221 Positive electrode plate 22, 122, 222 Negative electrode plate 21k, 121k, 221k Positive electrode active material layer 22k, 122k, 222k Negative electrode active material layer 23, 24, 123, 124, 223, 224, 323, 423 Separator 23M, 24M, 123M, 124M, 223M, 224M Separator body 23MA, 23MB, 24MA, 24MB, 123MA, 123MB, 124MA, 124MB, 223MA, 223MB, 224MA, 224MB Main surface 23BS (separator body) 23BS, 24AS, 123BS, 124AS, 223BS 224AS Porous layer EA Working area HT Thickness direction GM1, GM2 Negative side HJ Axial direction GH1 (Axial direction) One side GH2 (Axial direction) Other side EG1, EG2, EG3 Peripheral HN Longitudinal direction 23T, 24T, 123T, 124T Convex part (band-like convex part)
23O, 24O, 123O, 124O Concavity (band-shaped concavity)
23T1, 24T1, 123T1, 124T1, 323T1, 423T1 One side convex part (one side protruding band part (protruding band part))
23T2, 24T2, 123T2, 124T2, 323T2, 423T2 Other side convex part (the other side protruding band part (protruding band part))
23 O 1, 24 O 1, 123 O 1, 124 O 1, 323 O 1, 423 O 1 One side recess (one side lower portion (lower portion))
23O2, 24O2, 123O2, 124O2, 323O2, 423O2 The other side concave part (the other side low part (low part))
23T3, 24T3, 123T3, 124T3 Convex part (band-like convex part)
23O3, 24O3, 123O3, 124O3 recess (band-shaped recess)
223T1, 224T1 outer peripheral convex part (annular protruding band part (protruding band part))
223O1, 224O1 peripheral recess (annular low-order part (low-order part))
223T3, 224T3 Convex part (annular convex part)
223O3, 224O3 recess (annular recess)
2,202 battery pack HA stacking direction

Claims (13)

正極活物質層及び負極活物質層並びに上記正極活物質層と上記負極活物質層との間に介在するセパレータを有する電極体と、
上記電極体内に含浸された電解液と、
上記電極体及び上記電解液を収容する電池ケースと、を備える
二次電池であって、
上記セパレータは、
多孔質樹脂からなる板状のセパレータ本体と、このセパレータ本体の主面のうち上記負極活物質層側の面上の少なくとも一部に形成され、絶縁性無機多孔質材からなる多孔質層とを有し、
上記正極活物質層と上記負極活物質層とが当該セパレータを介して厚み方向に互いに重なる作用域内に、
上記作用域の周縁の少なくとも一部に沿って延びる帯状で、上記厚み方向のうち上記負極活物質層に向かう負極側に突出し、少なくとも上記厚み方向負極側の一部は上記多孔質層からなる突出帯部、及び、
上記突出帯部よりも上記厚み方向負極側に低位で上記セパレータ本体が露出し、上記突出帯部に沿って上記作用域の内側に隣在する低位部を有する
二次電池。 An electrode body having a positive electrode active material layer, a negative electrode active material layer, and a separator interposed between the positive electrode active material layer and the negative electrode active material layer;
An electrolyte solution impregnated in the electrode body;
A battery case containing the electrode body and the electrolytic solution, and a secondary battery comprising:
The separator is
A plate-like separator body made of a porous resin, and a porous layer made of an insulating inorganic porous material formed on at least a part of the main surface of the separator body on the negative electrode active material layer side. Have
In the working area where the positive electrode active material layer and the negative electrode active material layer overlap each other in the thickness direction via the separator,
A band extending along at least a part of the peripheral edge of the working area, and protrudes toward the negative electrode side toward the negative electrode active material layer in the thickness direction, and at least a part of the thickness direction negative electrode side protrudes from the porous layer. Band and
A secondary battery in which the separator main body is exposed at a lower position on the negative side in the thickness direction than the protruding band portion, and has a lower position adjacent to the inside of the working area along the protruding band portion. 請求項１に記載の二次電池であって、
前記電極体は、
前記正極活物質層を有する正極板と前記負極活物質層を有する負極板とを前記セパレータを介して軸線の周りに捲回してなり、上記正極板と上記負極板とが平板状に重なる平板部を有する扁平捲回電極体であり、
上記セパレータは、
前記作用域内で、かつ、少なくとも上記平板部内に位置する部位に、
前記突出帯部であり、上記作用域の上記軸線に沿う軸線方向一方側の周縁に沿って延びる一方側突出帯部、
上記突出帯部であり、上記作用域の上記軸線方向他方側の周縁に沿って延びる他方側突出帯部、
前記低位部であり、上記一方側突出帯部に沿って隣在する一方側低位部、及び、
上記低位部であり、上記他方側突出帯部に沿って隣在する他方側低位部、を有する
二次電池。 The secondary battery according to claim 1,
The electrode body is
A flat plate portion in which the positive electrode plate having the positive electrode active material layer and the negative electrode plate having the negative electrode active material layer are wound around the axis via the separator, and the positive electrode plate and the negative electrode plate overlap each other in a flat plate shape. A flat wound electrode body having
The separator is
In the region within the working area and at least in the flat plate portion,
The one side protruding band part extending along the peripheral edge on one side in the axial direction along the axis of the working area, the protruding band part;
The protruding band part, the other protruding band part extending along the peripheral edge on the other side in the axial direction of the working area,
The lower portion, one side lower portion adjacent to the one side protruding belt portion, and
The secondary battery which has the said other low side part which is the said low level part and adjoins along the said other side protrusion belt | band | zone part. 請求項２に記載の二次電池であって、
前記セパレータの前記一方側突出帯部及び前記他方側突出帯部は、
当該セパレータの長手方向全体に延びてなる
二次電池。 The secondary battery according to claim 2,
The one side protruding band part and the other side protruding band part of the separator,
A secondary battery extending in the entire longitudinal direction of the separator. 請求項２または請求項３に記載の二次電池であって、
前記セパレータは、
前記一方側低位部と前記他方側低位部との間に、
前記厚み方向負極側に突出し、当該セパレータの長手方向に延び、少なくとも上記厚み方向負極側の一部は前記多孔質層からなる複数の帯状凸部と、
上記帯状凸部同士の間に位置し、この帯状凸部よりも上記厚み方向負極側に低位で、上記長手方向に延びる一または複数の帯状凹部とを有する
二次電池。 The secondary battery according to claim 2 or 3, wherein
The separator is
Between the one side low level part and the other side low level part,
A plurality of strip-shaped convex portions that protrude toward the negative electrode side in the thickness direction, extend in the longitudinal direction of the separator, and at least a part of the negative electrode side in the thickness direction includes the porous layer;
A secondary battery having one or a plurality of belt-shaped concave portions which are located between the belt-shaped convex portions and extend lower in the thickness direction negative electrode side than the belt-shaped convex portions and extend in the longitudinal direction. 請求項１に記載の二次電池であって、
前記電極体は、
前記正極活物質層を有する正極板と前記負極活物質層を有する負極板とを前記セパレータを介して軸線の周りに円筒状に捲回してなる円筒状捲回電極体であり、
上記セパレータは、
前記突出帯部であり、前記作用域の上記軸線に沿う軸線方向一方側の周縁に沿って延びる一方側突出帯部、
上記突出帯部であり、上記作用域の上記軸線方向他方側の周縁に沿って延びる他方側突出帯部、
前記低位部であり、上記一方側突出帯部に沿って隣在する一方側低位部、及び、
上記低位部であり、上記他方側突出帯部に沿って隣在する他方側低位部、を有する
二次電池。 The secondary battery according to claim 1,
The electrode body is
A cylindrical wound electrode body formed by winding a positive electrode plate having the positive electrode active material layer and a negative electrode plate having the negative electrode active material layer in a cylindrical shape around an axis via the separator;
The separator is
The one side protruding band portion extending along the peripheral edge on one side in the axial direction along the axis of the working area, the protruding band portion;
The protruding band part, the other protruding band part extending along the peripheral edge on the other side in the axial direction of the working area,
The lower portion, one side lower portion adjacent to the one side protruding belt portion, and
The secondary battery which has the said other low side part which is the said low level part and adjoins along the said other side protrusion belt | band | zone part. 請求項５に記載の二次電池であって、
前記セパレータは、
前記一方側低位部と前記他方側低位部との間に、
前記厚み方向負極側に突出し、当該セパレータの長手方向に延び、少なくとも上記厚み方向負極側の一部は前記多孔質層からなる複数の帯状凸部と、
上記帯状凸部同士の間に位置し、この帯状凸部よりも上記厚み方向負極側に低位で、上記長手方向に延びる一または複数の帯状凹部とを有する
二次電池。 The secondary battery according to claim 5,
The separator is
Between the one side low level part and the other side low level part,
A plurality of strip-shaped convex portions that protrude toward the negative electrode side in the thickness direction, extend in the longitudinal direction of the separator, and at least a part of the negative electrode side in the thickness direction includes the porous layer;
A secondary battery having one or a plurality of belt-shaped concave portions which are located between the belt-shaped convex portions and extend lower in the thickness direction negative electrode side than the belt-shaped convex portions and extend in the longitudinal direction. 請求項１に記載の二次電池であって、
前記電極体は、
前記セパレータを介して前記正極活物質層と前記負極活物質層とが互いに平行に前記厚み方向に複数積層された積層型電極体であり、
上記セパレータは、
前記突出帯部であり、前記作用域の周縁に沿う環状の環状突出帯部と、
前記低位部であり、上記環状突出帯部に沿って上記作用域の内側に隣在する環状低位部とを有する
二次電池。 The secondary battery according to claim 1,
The electrode body is
A stacked electrode body in which a plurality of the positive electrode active material layers and the negative electrode active material layers are stacked in parallel in the thickness direction with the separator interposed therebetween;
The separator is
The projecting band part, an annular projecting band part along the periphery of the working area;
A secondary battery having the low-order part and the annular low-order part adjacent to the inside of the working area along the annular projecting belt part. 請求項７に記載の二次電池であって、
前記セパレータは、
前記作用域のうち前記環状突出帯部及び前記環状低位部の内側に位置し、前記厚み方向負極側に突出し、少なくとも上記厚み方向負極側の一部は前記多孔質層からなり、環状をなし入れ子状に配置された複数の環状凸部と、
上記環状凸部同士の間に位置し、この環状凸部よりも上記厚み方向負極側に低位で、環状をなし入れ子状に配置された複数の環状凹部とを有する
二次電池。 The secondary battery according to claim 7,
The separator is
It is located inside the annular projecting belt part and the annular lower part of the working area, projects to the thickness direction negative electrode side, at least a part of the thickness direction negative electrode side is made of the porous layer, and is annular and nested. A plurality of annular protrusions arranged in a shape;
A secondary battery having a plurality of annular recesses which are positioned between the annular projections and are lower than the annular projections on the negative side in the thickness direction and arranged in a nested manner. 請求項２〜請求項４のいずれか一項に記載の二次電池を複数備え、
上記二次電池の前記電池ケースは、
それぞれ平板状で互いに平行に配置されて、前記扁平捲回電極体の前記平板部を挟む２つの平行壁部を有し、
複数の上記二次電池を、上記電池ケースの上記平行壁部に直交する積層方向に積層し、上記扁平捲回電極体の上記平板部を前記厚み方向に圧縮してなる
組電池。 A plurality of the secondary batteries according to any one of claims 2 to 4 are provided,
The battery case of the secondary battery is
Each having a flat plate shape and two parallel wall portions sandwiching the flat plate portion of the flat wound electrode body,
A battery pack in which a plurality of the secondary batteries are stacked in a stacking direction orthogonal to the parallel wall portion of the battery case, and the flat plate portion of the flat wound electrode body is compressed in the thickness direction. 請求項７または請求項８に記載の二次電池を複数備え、
上記二次電池の前記電池ケースは、
それぞれ平板状で互いに平行に配置されて、前記積層型電極体を前記厚み方向に挟む２つの平行壁部を有し、
複数の上記二次電池を、上記電池ケースの上記平行壁部に直交する積層方向に積層し、上記積層型電極体を上記厚み方向に圧縮してなる
組電池。 A plurality of the secondary batteries according to claim 7 or claim 8 are provided,
The battery case of the secondary battery is
Each having a flat plate shape and two parallel wall portions sandwiching the stacked electrode body in the thickness direction;
An assembled battery in which a plurality of the secondary batteries are stacked in a stacking direction orthogonal to the parallel wall portion of the battery case, and the stacked electrode body is compressed in the thickness direction. 正極活物質層及び負極活物質層並びに上記正極活物質層と上記負極活物質層との間に介在するセパレータを有する電極体と、  An electrode body having a positive electrode active material layer, a negative electrode active material layer, and a separator interposed between the positive electrode active material layer and the negative electrode active material layer;
上記電極体内に含浸された電解液と、  An electrolyte solution impregnated in the electrode body;
上記電極体及び上記電解液を収容する電池ケースと、を備える  A battery case containing the electrode body and the electrolytic solution.
二次電池であって、A secondary battery,
上記セパレータは、  The separator is
多孔質樹脂からなる板状のセパレータ本体と、このセパレータ本体の主面のうち上記負極活物質層側の面上の少なくとも一部に形成され、絶縁性無機多孔質材からなる多孔質層とを有し、    A plate-like separator body made of a porous resin, and a porous layer made of an insulating inorganic porous material formed on at least a part of the main surface of the separator body on the negative electrode active material layer side. Have
上記正極活物質層と上記負極活物質層とが当該セパレータを介して厚み方向に互いに重なる作用域内に、    In the working area where the positive electrode active material layer and the negative electrode active material layer overlap each other in the thickness direction via the separator,
上記作用域の周縁の少なくとも一部に沿って延びる帯状で、上記厚み方向のうち上記負極活物質層に向かう負極側に突出し、少なくとも上記厚み方向負極側の一部は上記多孔質層からなる突出帯部、及び、    A band extending along at least a part of the peripheral edge of the working area, and protrudes toward the negative electrode side toward the negative electrode active material layer in the thickness direction, and at least a part of the thickness direction negative electrode side protrudes from the porous layer. Band and
上記突出帯部よりも上記厚み方向負極側に低位で、上記突出帯部に沿って上記作用域の内側に隣在する低位部を有し、    It has a lower position adjacent to the inside of the working area along the protruding band portion at a lower position than the protruding band portion on the thickness direction negative electrode side,
前記電極体は、  The electrode body is
前記セパレータを介して前記正極活物質層と前記負極活物質層とが互いに平行に前記厚み方向に複数積層された積層型電極体であり、    A stacked electrode body in which a plurality of the positive electrode active material layers and the negative electrode active material layers are stacked in parallel in the thickness direction with the separator interposed therebetween;
上記セパレータは、  The separator is
前記突出帯部であり、前記作用域の周縁に沿う環状の環状突出帯部と、    The projecting band part, an annular projecting band part along the periphery of the working area;
前記低位部であり、上記環状突出帯部に沿って上記作用域の内側に隣在する環状低位部とを有する    The lower portion, and the annular lower portion adjacent to the inside of the working area along the annular protruding belt portion.
二次電池。Secondary battery. 請求項１１に記載の二次電池であって、The secondary battery according to claim 11,
前記セパレータは、  The separator is
前記作用域のうち前記環状突出帯部及び前記環状低位部の内側に位置し、前記厚み方向負極側に突出し、少なくとも上記厚み方向負極側の一部は前記多孔質層からなり、環状をなし入れ子状に配置された複数の環状凸部と、    It is located inside the annular projecting belt part and the annular lower part of the working area, projects to the thickness direction negative electrode side, at least a part of the thickness direction negative electrode side is made of the porous layer, and is annular and nested. A plurality of annular protrusions arranged in a shape;
上記環状凸部同士の間に位置し、この環状凸部よりも上記厚み方向負極側に低位で、環状をなし入れ子状に配置された複数の環状凹部とを有する    A plurality of annular recesses that are positioned between the annular projections and are lower than the annular projections on the negative side in the thickness direction and arranged in a nested manner.
二次電池。Secondary battery. 請求項１１または請求項１２に記載の二次電池を複数備え、A plurality of the secondary batteries according to claim 11 or claim 12 are provided,
上記二次電池の前記電池ケースは、  The battery case of the secondary battery is
それぞれ平板状で互いに平行に配置されて、前記積層型電極体を前記厚み方向に挟む２つの平行壁部を有し、    Each having a flat plate shape and two parallel wall portions sandwiching the stacked electrode body in the thickness direction;
複数の上記二次電池を、上記電池ケースの上記平行壁部に直交する積層方向に積層し、上記積層型電極体を上記厚み方向に圧縮してなる  A plurality of the secondary batteries are stacked in a stacking direction orthogonal to the parallel wall portion of the battery case, and the stacked electrode body is compressed in the thickness direction.
組電池。Assembled battery.
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